diff options
Diffstat (limited to 'arch/cris/arch-v32/kernel')
| -rw-r--r-- | arch/cris/arch-v32/kernel/Makefile | 17 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/cache.c | 33 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/cacheflush.S | 99 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/crisksyms.c | 28 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/debugport.c | 233 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/entry.S | 889 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/fasttimer.c | 793 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/head.S | 440 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/irq.c | 520 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/kgdb.c | 1612 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/kgdb_asm.S | 551 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/process.c | 184 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/ptrace.c | 490 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/setup.c | 170 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/signal.c | 540 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/time.c | 342 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/traps.c | 193 |
17 files changed, 7134 insertions, 0 deletions
diff --git a/arch/cris/arch-v32/kernel/Makefile b/arch/cris/arch-v32/kernel/Makefile new file mode 100644 index 000000000..d9fc617ea --- /dev/null +++ b/arch/cris/arch-v32/kernel/Makefile @@ -0,0 +1,17 @@ +# +# Makefile for the linux kernel. +# + +extra-y := head.o + + +obj-y := entry.o traps.o irq.o debugport.o \ + process.o ptrace.o setup.o signal.o traps.o time.o \ + cache.o cacheflush.o + +obj-$(CONFIG_ETRAX_KGDB) += kgdb.o kgdb_asm.o +obj-$(CONFIG_ETRAX_FAST_TIMER) += fasttimer.o +obj-$(CONFIG_MODULES) += crisksyms.o + +clean: + diff --git a/arch/cris/arch-v32/kernel/cache.c b/arch/cris/arch-v32/kernel/cache.c new file mode 100644 index 000000000..f38433b1f --- /dev/null +++ b/arch/cris/arch-v32/kernel/cache.c @@ -0,0 +1,33 @@ +#include <linux/module.h> +#include <asm/io.h> +#include <arch/cache.h> +#include <arch/hwregs/dma.h> + +/* This file is used to workaround a cache bug, Guinness TR 106. */ + +inline void flush_dma_descr(struct dma_descr_data *descr, int flush_buf) +{ + /* Flush descriptor to make sure we get correct in_eop and after. */ + asm volatile ("ftagd [%0]" :: "r" (descr)); + /* Flush buffer pointed out by descriptor. */ + if (flush_buf) + cris_flush_cache_range(phys_to_virt((unsigned)descr->buf), + (unsigned)(descr->after - descr->buf)); +} +EXPORT_SYMBOL(flush_dma_descr); + +void flush_dma_list(struct dma_descr_data *descr) +{ + while (1) { + flush_dma_descr(descr, 1); + if (descr->eol) + break; + descr = phys_to_virt((unsigned)descr->next); + } +} +EXPORT_SYMBOL(flush_dma_list); + +/* From cacheflush.S */ +EXPORT_SYMBOL(cris_flush_cache); +/* From cacheflush.S */ +EXPORT_SYMBOL(cris_flush_cache_range); diff --git a/arch/cris/arch-v32/kernel/cacheflush.S b/arch/cris/arch-v32/kernel/cacheflush.S new file mode 100644 index 000000000..6fc3d95d7 --- /dev/null +++ b/arch/cris/arch-v32/kernel/cacheflush.S @@ -0,0 +1,99 @@ + .global cris_flush_cache_range + .type cris_flush_cache_range, @function +cris_flush_cache_range: + move.d 1024, $r12 + cmp.d $r11, $r12 + bhi cris_flush_1KB + nop + add.d $r10, $r11 + ftagd [$r10] +cris_flush_last: + addq 32, $r10 + cmp.d $r11, $r10 + blt cris_flush_last + ftagd [$r10] + ret + nop +cris_flush_1KB: + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ftagd [$r10] + addq 32, $r10 + ba cris_flush_cache_range + sub.d $r12, $r11 + .size cris_flush_cache_range, . - cris_flush_cache_range + + .global cris_flush_cache + .type cris_flush_cache, @function +cris_flush_cache: + moveq 0, $r10 +cris_flush_line: + move.d 16*1024, $r11 + addq 16, $r10 + cmp.d $r10, $r11 + blt cris_flush_line + fidxd [$r10] + ret + nop + .size cris_flush_cache, . - cris_flush_cache + diff --git a/arch/cris/arch-v32/kernel/crisksyms.c b/arch/cris/arch-v32/kernel/crisksyms.c new file mode 100644 index 000000000..bde8d1a10 --- /dev/null +++ b/arch/cris/arch-v32/kernel/crisksyms.c @@ -0,0 +1,28 @@ +#include <linux/module.h> +#include <linux/irq.h> +#include <arch/dma.h> +#include <arch/intmem.h> +#include <mach/pinmux.h> +#include <arch/io.h> + +/* Functions for allocating DMA channels */ +EXPORT_SYMBOL(crisv32_request_dma); +EXPORT_SYMBOL(crisv32_free_dma); + +/* Functions for handling internal RAM */ +EXPORT_SYMBOL(crisv32_intmem_alloc); +EXPORT_SYMBOL(crisv32_intmem_free); +EXPORT_SYMBOL(crisv32_intmem_phys_to_virt); +EXPORT_SYMBOL(crisv32_intmem_virt_to_phys); + +/* Functions for handling pinmux */ +EXPORT_SYMBOL(crisv32_pinmux_alloc); +EXPORT_SYMBOL(crisv32_pinmux_alloc_fixed); +EXPORT_SYMBOL(crisv32_pinmux_dealloc); +EXPORT_SYMBOL(crisv32_pinmux_dealloc_fixed); +EXPORT_SYMBOL(crisv32_io_get_name); +EXPORT_SYMBOL(crisv32_io_get); + +/* Functions masking/unmasking interrupts */ +EXPORT_SYMBOL(crisv32_mask_irq); +EXPORT_SYMBOL(crisv32_unmask_irq); diff --git a/arch/cris/arch-v32/kernel/debugport.c b/arch/cris/arch-v32/kernel/debugport.c new file mode 100644 index 000000000..02e33ebe5 --- /dev/null +++ b/arch/cris/arch-v32/kernel/debugport.c @@ -0,0 +1,233 @@ +/* + * Copyright (C) 2003, Axis Communications AB. + */ + +#include <linux/console.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/string.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/reg_map.h> +#include <hwregs/ser_defs.h> +#include <hwregs/dma_defs.h> +#include <mach/pinmux.h> + +struct dbg_port +{ + unsigned char nbr; + unsigned long instance; + unsigned int started; + unsigned long baudrate; + unsigned char parity; + unsigned int bits; +}; + +struct dbg_port ports[] = +{ + { + 0, + regi_ser0, + 0, + 115200, + 'N', + 8 + }, + { + 1, + regi_ser1, + 0, + 115200, + 'N', + 8 + }, + { + 2, + regi_ser2, + 0, + 115200, + 'N', + 8 + }, + { + 3, + regi_ser3, + 0, + 115200, + 'N', + 8 + }, +#if CONFIG_ETRAX_SERIAL_PORTS == 5 + { + 4, + regi_ser4, + 0, + 115200, + 'N', + 8 + }, +#endif +}; + +static struct dbg_port *port = +#if defined(CONFIG_ETRAX_DEBUG_PORT0) + &ports[0]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT1) + &ports[1]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT2) + &ports[2]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT3) + &ports[3]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT4) + &ports[4]; +#else + NULL; +#endif + +#ifdef CONFIG_ETRAX_KGDB +static struct dbg_port *kgdb_port = +#if defined(CONFIG_ETRAX_KGDB_PORT0) + &ports[0]; +#elif defined(CONFIG_ETRAX_KGDB_PORT1) + &ports[1]; +#elif defined(CONFIG_ETRAX_KGDB_PORT2) + &ports[2]; +#elif defined(CONFIG_ETRAX_KGDB_PORT3) + &ports[3]; +#elif defined(CONFIG_ETRAX_KGDB_PORT4) + &ports[4]; +#else + NULL; +#endif +#endif + +static void start_port(struct dbg_port *p) +{ + /* Set up serial port registers */ + reg_ser_rw_tr_ctrl tr_ctrl = {0}; + reg_ser_rw_tr_dma_en tr_dma_en = {0}; + + reg_ser_rw_rec_ctrl rec_ctrl = {0}; + reg_ser_rw_tr_baud_div tr_baud_div = {0}; + reg_ser_rw_rec_baud_div rec_baud_div = {0}; + + if (!p || p->started) + return; + + p->started = 1; + + if (p->nbr == 1) + crisv32_pinmux_alloc_fixed(pinmux_ser1); + else if (p->nbr == 2) + crisv32_pinmux_alloc_fixed(pinmux_ser2); + else if (p->nbr == 3) + crisv32_pinmux_alloc_fixed(pinmux_ser3); +#if CONFIG_ETRAX_SERIAL_PORTS == 5 + else if (p->nbr == 4) + crisv32_pinmux_alloc_fixed(pinmux_ser4); +#endif + + tr_ctrl.base_freq = rec_ctrl.base_freq = regk_ser_f29_493; + tr_dma_en.en = rec_ctrl.dma_mode = regk_ser_no; + tr_baud_div.div = rec_baud_div.div = 29493000 / p->baudrate / 8; + tr_ctrl.en = rec_ctrl.en = 1; + + if (p->parity == 'O') { + tr_ctrl.par_en = regk_ser_yes; + tr_ctrl.par = regk_ser_odd; + rec_ctrl.par_en = regk_ser_yes; + rec_ctrl.par = regk_ser_odd; + } else if (p->parity == 'E') { + tr_ctrl.par_en = regk_ser_yes; + tr_ctrl.par = regk_ser_even; + rec_ctrl.par_en = regk_ser_yes; + rec_ctrl.par = regk_ser_odd; + } + + if (p->bits == 7) { + tr_ctrl.data_bits = regk_ser_bits7; + rec_ctrl.data_bits = regk_ser_bits7; + } + + REG_WR (ser, p->instance, rw_tr_baud_div, tr_baud_div); + REG_WR (ser, p->instance, rw_rec_baud_div, rec_baud_div); + REG_WR (ser, p->instance, rw_tr_dma_en, tr_dma_en); + REG_WR (ser, p->instance, rw_tr_ctrl, tr_ctrl); + REG_WR (ser, p->instance, rw_rec_ctrl, rec_ctrl); +} + +#ifdef CONFIG_ETRAX_KGDB +/* Use polling to get a single character from the kernel debug port */ +int getDebugChar(void) +{ + reg_ser_rs_stat_din stat; + reg_ser_rw_ack_intr ack_intr = { 0 }; + + do { + stat = REG_RD(ser, kgdb_port->instance, rs_stat_din); + } while (!stat.dav); + + /* Ack the data_avail interrupt. */ + ack_intr.dav = 1; + REG_WR(ser, kgdb_port->instance, rw_ack_intr, ack_intr); + + return stat.data; +} + +/* Use polling to put a single character to the kernel debug port */ +void putDebugChar(int val) +{ + reg_ser_r_stat_din stat; + do { + stat = REG_RD(ser, kgdb_port->instance, r_stat_din); + } while (!stat.tr_rdy); + REG_WR_INT(ser, kgdb_port->instance, rw_dout, val); +} +#endif /* CONFIG_ETRAX_KGDB */ + +static void __init early_putch(int c) +{ + reg_ser_r_stat_din stat; + /* Wait until transmitter is ready and send. */ + do + stat = REG_RD(ser, port->instance, r_stat_din); + while (!stat.tr_rdy); + REG_WR_INT(ser, port->instance, rw_dout, c); +} + +static void __init +early_console_write(struct console *con, const char *s, unsigned n) +{ + extern void reset_watchdog(void); + int i; + + /* Send data. */ + for (i = 0; i < n; i++) { + /* TODO: the '\n' -> '\n\r' translation should be done at the + receiver. Remove it when the serial driver removes it. */ + if (s[i] == '\n') + early_putch('\r'); + early_putch(s[i]); + reset_watchdog(); + } +} + +static struct console early_console_dev __initdata = { + .name = "early", + .write = early_console_write, + .flags = CON_PRINTBUFFER | CON_BOOT, + .index = -1 +}; + +/* Register console for printk's, etc. */ +int __init init_etrax_debug(void) +{ + start_port(port); + + /* Register an early console if a debug port was chosen. */ + register_console(&early_console_dev); + +#ifdef CONFIG_ETRAX_KGDB + start_port(kgdb_port); +#endif /* CONFIG_ETRAX_KGDB */ + return 0; +} diff --git a/arch/cris/arch-v32/kernel/entry.S b/arch/cris/arch-v32/kernel/entry.S new file mode 100644 index 000000000..026a0b21b --- /dev/null +++ b/arch/cris/arch-v32/kernel/entry.S @@ -0,0 +1,889 @@ +/* + * Copyright (C) 2000-2003 Axis Communications AB + * + * Authors: Bjorn Wesen (bjornw@axis.com) + * Tobias Anderberg (tobiasa@axis.com), CRISv32 port. + * + * Code for the system-call and fault low-level handling routines. + * + * NOTE: This code handles signal-recognition, which happens every time + * after a timer-interrupt and after each system call. + * + * Stack layout in 'ret_from_system_call': + * ptrace needs to have all regs on the stack. + * if the order here is changed, it needs to be + * updated in fork.c:copy_process, signal.c:do_signal, + * ptrace.c and ptrace.h + * + */ + +#include <linux/linkage.h> +#include <linux/sys.h> +#include <asm/unistd.h> +#include <asm/errno.h> +#include <asm/thread_info.h> +#include <asm/asm-offsets.h> + +#include <hwregs/asm/reg_map_asm.h> +#include <hwregs/asm/intr_vect_defs_asm.h> + + ;; Exported functions. + .globl system_call + .globl ret_from_intr + .globl ret_from_fork + .globl ret_from_kernel_thread + .globl resume + .globl multiple_interrupt + .globl nmi_interrupt + .globl spurious_interrupt + .globl do_sigtrap + .globl gdb_handle_exception + .globl sys_call_table + + ; Check if preemptive kernel scheduling should be done. +#ifdef CONFIG_PREEMPT +_resume_kernel: + di + ; Load current task struct. + movs.w -8192, $r0 ; THREAD_SIZE = 8192 + and.d $sp, $r0 + + addoq +TI_preempt_count, $r0, $acr + move.d [$acr], $r10 ; Preemption disabled? + bne _Rexit + nop + +_need_resched: + addoq +TI_flags, $r0, $acr + move.d [$acr], $r10 + btstq TIF_NEED_RESCHED, $r10 ; Check if need_resched is set. + bpl _Rexit + nop + + ; Do preemptive kernel scheduling. + jsr preempt_schedule_irq + nop + + ; Load new task struct. + movs.w -8192, $r0 ; THREAD_SIZE = 8192. + and.d $sp, $r0 + + ; One more time with new task. + ba _need_resched + nop +#else +#define _resume_kernel _Rexit +#endif + + ; Called at exit from fork. schedule_tail must be called to drop + ; spinlock if CONFIG_PREEMPT. + .type ret_from_fork,@function +ret_from_fork: + jsr schedule_tail + nop + ba ret_from_sys_call + nop + .size ret_from_fork, . - ret_from_fork + + .type ret_from_kernel_thread,@function +ret_from_kernel_thread: + jsr schedule_tail + nop + move.d $r2, $r10 + jsr $r1 + nop + moveq 0, $r9 ; no syscall restarts, TYVM... + ba ret_from_sys_call + nop + .size ret_from_kernel_thread, . - ret_from_kernel_thread + + .type ret_from_intr,@function +ret_from_intr: + moveq 0, $r9 ; not a syscall + + ;; Check for resched if preemptive kernel, or if we're going back to + ;; user-mode. This test matches the user_regs(regs) macro. Don't simply + ;; test CCS since that doesn't necessarily reflect what mode we'll + ;; return into. + addoq +PT_ccs, $sp, $acr + move.d [$acr], $r0 + btstq 16, $r0 ; User-mode flag. + bpl _resume_kernel + .size ret_from_intr, . - ret_from_intr + 2 ; +2 includes the dslot. + + ; Note that di below is in delay slot. + .type _resume_userspace,@function +_resume_userspace: + di ; So need_resched and sigpending don't change. + + movs.w -8192, $r0 ; THREAD_SIZE == 8192 + and.d $sp, $r0 + + addoq +TI_flags, $r0, $acr ; current->work + move.d [$acr], $r10 + and.d _TIF_WORK_MASK, $r10 ; Work to be done on return? + bne _work_pending + nop + ba _Rexit + nop + .size _resume_userspace, . - _resume_userspace + + ;; The system_call is called by a BREAK instruction, which looks pretty + ;; much like any other exception. + ;; + ;; System calls can't be made from interrupts but we still stack ERP + ;; to have a complete stack frame. + ;; + ;; In r9 we have the wanted syscall number. Arguments come in r10,r11,r12, + ;; r13,mof,srp + ;; + ;; This function looks on the _surface_ like spaghetti programming, but it's + ;; really designed so that the fast-path does not force cache-loading of + ;; non-used instructions. Only the non-common cases cause the outlined code + ;; to run.. + + .type system_call,@function +system_call: + ;; Stack-frame similar to the irq heads, which is reversed in + ;; ret_from_sys_call. + + sub.d 92, $sp ; Skip EDA. + movem $r13, [$sp] + move.d $sp, $r8 + addq 14*4, $r8 + move.d $acr, $r0 + move $srs, $r1 + move $mof, $r2 + move $spc, $r3 + move $ccs, $r4 + move $srp, $r5 + move $erp, $r6 + move.d $r9, $r7 ; Store syscall number in EXS + subq 4, $sp + movem $r7, [$r8] + ei ; Enable interrupts while processing syscalls. + move.d $r10, [$sp] + + ; Set S-bit when kernel debugging to keep hardware breakpoints active. +#ifdef CONFIG_ETRAX_KGDB + move $ccs, $r0 + or.d (1<<9), $r0 + move $r0, $ccs +#endif + + movs.w -ENOSYS, $r0 + addoq +PT_r10, $sp, $acr + move.d $r0, [$acr] + + ;; Check if this process is syscall-traced. + movs.w -8192, $r0 ; THREAD_SIZE == 8192 + and.d $sp, $r0 + + addoq +TI_flags, $r0, $acr + move.d [$acr], $r0 + btstq TIF_SYSCALL_TRACE, $r0 + bmi _syscall_trace_entry + nop + +_syscall_traced: + ;; Check for sanity in the requested syscall number. + cmpu.w NR_syscalls, $r9 + bhs ret_from_sys_call + lslq 2, $r9 ; Multiply by 4, in the delay slot. + + ;; The location on the stack for the register structure is passed as a + ;; seventh argument. Some system calls need this. + move.d $sp, $r0 + subq 4, $sp + move.d $r0, [$sp] + + ;; The registers carrying parameters (R10-R13) are intact. The optional + ;; fifth and sixth parameters is in MOF and SRP respectively. Put them + ;; back on the stack. + subq 4, $sp + move $srp, [$sp] + subq 4, $sp + move $mof, [$sp] + + ;; Actually to the system call. + addo.d +sys_call_table, $r9, $acr + move.d [$acr], $acr + jsr $acr + nop + + addq 3*4, $sp ; Pop the mof, srp and regs parameters. + addoq +PT_r10, $sp, $acr + move.d $r10, [$acr] ; Save the return value. + + moveq 1, $r9 ; "Parameter" to ret_from_sys_call to + ; show it was a sys call. + + ;; Fall through into ret_from_sys_call to return. + +ret_from_sys_call: + ;; R9 is a parameter: + ;; >= 1 from syscall + ;; 0 from irq + + ;; Get the current task-struct pointer. + movs.w -8192, $r0 ; THREAD_SIZE == 8192 + and.d $sp, $r0 + + di ; Make sure need_resched and sigpending don't change. + + addoq +TI_flags, $r0, $acr + move.d [$acr], $r1 + and.d _TIF_ALLWORK_MASK, $r1 + bne _syscall_exit_work + nop + .size system_call, . - system_call + + .type _Rexit,@function +_Rexit: + ;; This epilogue MUST match the prologues in multiple_interrupt, irq.h + ;; and ptregs.h. + addq 4, $sp ; Skip orig_r10. + movem [$sp+], $r13 ; Registers R0-R13. + move.d [$sp+], $acr + move [$sp], $srs + addq 4, $sp + move [$sp+], $mof + move [$sp+], $spc + move [$sp+], $ccs + move [$sp+], $srp + move [$sp+], $erp + addq 8, $sp ; Skip EXS, EDA. + jump $erp + rfe ; Restore condition code stack in delay-slot. + .size _Rexit, . - _Rexit + + ;; We get here after doing a syscall if extra work might need to be done + ;; perform syscall exit tracing if needed. + + .type _syscall_exit_work,@function +_syscall_exit_work: + ;; R0 contains current at this point and irq's are disabled. + + addoq +TI_flags, $r0, $acr + move.d [$acr], $r1 + btstq TIF_SYSCALL_TRACE, $r1 + bpl _work_pending + nop + ei + move.d $r9, $r1 ; Preserve R9. + jsr do_syscall_trace + nop + move.d $r1, $r9 + ba _resume_userspace + nop + .size _syscall_exit_work, . - _syscall_exit_work + + .type _work_pending,@function +_work_pending: + addoq +TI_flags, $r0, $acr + move.d [$acr], $r12 ; The thread_info_flags parameter. + move.d $sp, $r11 ; The regs param. + jsr do_work_pending + move.d $r9, $r10 ; The syscall/irq param. + + ba _Rexit + nop + .size _work_pending, . - _work_pending + + ;; We get here as a sidetrack when we've entered a syscall with the + ;; trace-bit set. We need to call do_syscall_trace and then continue + ;; with the call. + +_syscall_trace_entry: + ;; PT_r10 in the frame contains -ENOSYS as required, at this point. + + jsr do_syscall_trace + nop + + ;; Now re-enter the syscall code to do the syscall itself. We need to + ;; restore R9 here to contain the wanted syscall, and the other + ;; parameter-bearing registers. + addoq +PT_r9, $sp, $acr + move.d [$acr], $r9 + addoq +PT_orig_r10, $sp, $acr + move.d [$acr], $r10 ; PT_r10 is already -ENOSYS. + addoq +PT_r11, $sp, $acr + move.d [$acr], $r11 + addoq +PT_r12, $sp, $acr + move.d [$acr], $r12 + addoq +PT_r13, $sp, $acr + move.d [$acr], $r13 + addoq +PT_mof, $sp, $acr + move [$acr], $mof + addoq +PT_srp, $sp, $acr + move [$acr], $srp + + ba _syscall_traced + nop + + ;; Resume performs the actual task-switching, by switching stack + ;; pointers. Input arguments are: + ;; + ;; R10 = prev + ;; R11 = next + ;; R12 = thread offset in task struct. + ;; + ;; Returns old current in R10. + + .type resume,@function +resume: + subq 4, $sp ; Make space for srp. + + add.d $r12, $r10 ; R10 = current tasks tss. + addoq +THREAD_ccs, $r10, $acr + move $srp, [$sp] ; Keep old/new PC on the stack. + move $ccs, [$acr] ; Save IRQ enable state. + di + + addoq +THREAD_usp, $r10, $acr + subq 10*4, $sp ; Make room for R9. + move $usp, [$acr] ; Save user-mode stackpointer. + + ;; See copy_thread for the reason why register R9 is saved. + movem $r9, [$sp] ; Save non-scratch registers and R9. + + addoq +THREAD_ksp, $r10, $acr + move.d $sp, $r10 ; Return last running task in R10. + move.d $sp, [$acr] ; Save kernel SP for old task. + + and.d -8192, $r10 ; Get thread_info from stackpointer. + addoq +TI_task, $r10, $acr + add.d $r12, $r11 ; Find the new tasks tss. + move.d [$acr], $r10 ; Get task. + addoq +THREAD_ksp, $r11, $acr + move.d [$acr], $sp ; Switch to new stackframe. + addoq +THREAD_usp, $r11, $acr + movem [$sp+], $r9 ; Restore non-scratch registers and R9. + + move [$acr], $usp ; Restore user-mode stackpointer. + + addoq +THREAD_ccs, $r11, $acr + move.d [$sp+], $r11 + jump $r11 ; Restore PC. + move [$acr], $ccs ; Restore IRQ enable status. + .size resume, . - resume + +nmi_interrupt: + +;; If we receive a watchdog interrupt while it is not expected, then set +;; up a canonical frame and dump register contents before dying. + + ;; This prologue MUST match the one in irq.h and the struct in ptregs.h! + subq 12, $sp ; Skip EXS, EDA. + move $nrp, [$sp] + subq 4, $sp + move $srp, [$sp] + subq 4, $sp + move $ccs, [$sp] + subq 4, $sp + move $spc, [$sp] + subq 4, $sp + move $mof, [$sp] + subq 4, $sp + move $srs, [$sp] + subq 4, $sp + move.d $acr, [$sp] + subq 14*4, $sp ; Make room for R0-R13. + movem $r13, [$sp] ; Push R0-R13. + subq 4, $sp + move.d $r10, [$sp] ; Push orig_r10. + move.d REG_ADDR(intr_vect, regi_irq, r_nmi), $r0 + move.d [$r0], $r0 + btstq REG_BIT(intr_vect, r_nmi, watchdog), $r0 + bpl 1f + nop + jsr handle_watchdog_bite ; In time.c. + move.d $sp, $r10 ; Pointer to registers +1: btstq REG_BIT(intr_vect, r_nmi, ext), $r0 + bpl 1f + nop + jsr handle_nmi + move.d $sp, $r10 ; Pointer to registers +1: addq 4, $sp ; Skip orig_r10 + movem [$sp+], $r13 + move.d [$sp+], $acr + move [$sp], $srs + addq 4, $sp + move [$sp+], $mof + move [$sp+], $spc + move [$sp+], $ccs + move [$sp+], $srp + move [$sp+], $nrp + addq 8, $sp ; Skip EXS, EDA. + jump $nrp + rfn + + .comm cause_of_death, 4 ;; Don't declare this anywhere. + +spurious_interrupt: + di + jump hard_reset_now + nop + + ;; This handles the case when multiple interrupts arrive at the same + ;; time. Jump to the first set interrupt bit in a priority fashion. The + ;; hardware will call the unserved interrupts after the handler + ;; finishes. + .type multiple_interrupt, @function +multiple_interrupt: + ;; This prologue MUST match the one in irq.h and the struct in ptregs.h! + subq 12, $sp ; Skip EXS, EDA. + move $erp, [$sp] + subq 4, $sp + move $srp, [$sp] + subq 4, $sp + move $ccs, [$sp] + subq 4, $sp + move $spc, [$sp] + subq 4, $sp + move $mof, [$sp] + subq 4, $sp + move $srs, [$sp] + subq 4, $sp + move.d $acr, [$sp] + subq 14*4, $sp ; Make room for R0-R13. + movem $r13, [$sp] ; Push R0-R13. + subq 4, $sp + move.d $r10, [$sp] ; Push orig_r10. + +; Set S-bit when kernel debugging to keep hardware breakpoints active. +#ifdef CONFIG_ETRAX_KGDB + move $ccs, $r0 + or.d (1<<9), $r0 + move $r0, $ccs +#endif + + jsr crisv32_do_multiple + move.d $sp, $r10 + jump ret_from_intr + nop + .size multiple_interrupt, . - multiple_interrupt + +do_sigtrap: + ;; Sigtraps the process that executed the BREAK instruction. Creates a + ;; frame that Rexit expects. + subq 4, $sp + move $eda, [$sp] + subq 4, $sp + move $exs, [$sp] + subq 4, $sp + move $erp, [$sp] + subq 4, $sp + move $srp, [$sp] + subq 4, $sp + move $ccs, [$sp] + subq 4, $sp + move $spc, [$sp] + subq 4, $sp + move $mof, [$sp] + subq 4, $sp + move $srs, [$sp] + subq 4, $sp + move.d $acr, [$sp] + di ; Need to disable irq's at this point. + subq 14*4, $sp ; Make room for r0-r13. + movem $r13, [$sp] ; Push the r0-r13 registers. + subq 4, $sp + move.d $r10, [$sp] ; Push orig_r10. + + movs.w -8192, $r9 ; THREAD_SIZE == 8192 + and.d $sp, $r9 + + ;; thread_info as first parameter + move.d $r9, $r10 + moveq 5, $r11 ; SIGTRAP as second argument. + jsr ugdb_trap_user + nop + jump ret_from_intr ; Use the return routine for interrupts. + nop + +gdb_handle_exception: + subq 4, $sp + move.d $r0, [$sp] +#ifdef CONFIG_ETRAX_KGDB + move $ccs, $r0 ; U-flag not affected by previous insns. + btstq 16, $r0 ; Test the U-flag. + bmi _ugdb_handle_exception ; Go to user mode debugging. + nop ; Empty delay-slot (cannot pop R0 here). + ba kgdb_handle_exception ; Go to kernel debugging. + move.d [$sp+], $r0 ; Restore R0 in delay slot. +#endif + +_ugdb_handle_exception: + ba do_sigtrap ; SIGTRAP the offending process. + move.d [$sp+], $r0 ; Restore R0 in delay slot. + + .data + + .section .rodata,"a" +sys_call_table: + .long sys_restart_syscall ; 0 - old "setup()" system call, used + ; for restarting. + .long sys_exit + .long sys_fork + .long sys_read + .long sys_write + .long sys_open /* 5 */ + .long sys_close + .long sys_waitpid + .long sys_creat + .long sys_link + .long sys_unlink /* 10 */ + .long sys_execve + .long sys_chdir + .long sys_time + .long sys_mknod + .long sys_chmod /* 15 */ + .long sys_lchown16 + .long sys_ni_syscall /* old break syscall holder */ + .long sys_stat + .long sys_lseek + .long sys_getpid /* 20 */ + .long sys_mount + .long sys_oldumount + .long sys_setuid16 + .long sys_getuid16 + .long sys_stime /* 25 */ + .long sys_ptrace + .long sys_alarm + .long sys_fstat + .long sys_pause + .long sys_utime /* 30 */ + .long sys_ni_syscall /* old stty syscall holder */ + .long sys_ni_syscall /* old gtty syscall holder */ + .long sys_access + .long sys_nice + .long sys_ni_syscall /* 35 old ftime syscall holder */ + .long sys_sync + .long sys_kill + .long sys_rename + .long sys_mkdir + .long sys_rmdir /* 40 */ + .long sys_dup + .long sys_pipe + .long sys_times + .long sys_ni_syscall /* old prof syscall holder */ + .long sys_brk /* 45 */ + .long sys_setgid16 + .long sys_getgid16 + .long sys_signal + .long sys_geteuid16 + .long sys_getegid16 /* 50 */ + .long sys_acct + .long sys_umount /* recycled never used phys( */ + .long sys_ni_syscall /* old lock syscall holder */ + .long sys_ioctl + .long sys_fcntl /* 55 */ + .long sys_ni_syscall /* old mpx syscall holder */ + .long sys_setpgid + .long sys_ni_syscall /* old ulimit syscall holder */ + .long sys_ni_syscall /* old sys_olduname holder */ + .long sys_umask /* 60 */ + .long sys_chroot + .long sys_ustat + .long sys_dup2 + .long sys_getppid + .long sys_getpgrp /* 65 */ + .long sys_setsid + .long sys_sigaction + .long sys_sgetmask + .long sys_ssetmask + .long sys_setreuid16 /* 70 */ + .long sys_setregid16 + .long sys_sigsuspend + .long sys_sigpending + .long sys_sethostname + .long sys_setrlimit /* 75 */ + .long sys_old_getrlimit + .long sys_getrusage + .long sys_gettimeofday + .long sys_settimeofday + .long sys_getgroups16 /* 80 */ + .long sys_setgroups16 + .long sys_select /* was old_select in Linux/E100 */ + .long sys_symlink + .long sys_lstat + .long sys_readlink /* 85 */ + .long sys_uselib + .long sys_swapon + .long sys_reboot + .long sys_old_readdir + .long sys_old_mmap /* 90 */ + .long sys_munmap + .long sys_truncate + .long sys_ftruncate + .long sys_fchmod + .long sys_fchown16 /* 95 */ + .long sys_getpriority + .long sys_setpriority + .long sys_ni_syscall /* old profil syscall holder */ + .long sys_statfs + .long sys_fstatfs /* 100 */ + .long sys_ni_syscall /* sys_ioperm in i386 */ + .long sys_socketcall + .long sys_syslog + .long sys_setitimer + .long sys_getitimer /* 105 */ + .long sys_newstat + .long sys_newlstat + .long sys_newfstat + .long sys_ni_syscall /* old sys_uname holder */ + .long sys_ni_syscall /* sys_iopl in i386 */ + .long sys_vhangup + .long sys_ni_syscall /* old "idle" system call */ + .long sys_ni_syscall /* vm86old in i386 */ + .long sys_wait4 + .long sys_swapoff /* 115 */ + .long sys_sysinfo + .long sys_ipc + .long sys_fsync + .long sys_sigreturn + .long sys_clone /* 120 */ + .long sys_setdomainname + .long sys_newuname + .long sys_ni_syscall /* sys_modify_ldt */ + .long sys_adjtimex + .long sys_mprotect /* 125 */ + .long sys_sigprocmask + .long sys_ni_syscall /* old "create_module" */ + .long sys_init_module + .long sys_delete_module + .long sys_ni_syscall /* 130: old "get_kernel_syms" */ + .long sys_quotactl + .long sys_getpgid + .long sys_fchdir + .long sys_bdflush + .long sys_sysfs /* 135 */ + .long sys_personality + .long sys_ni_syscall /* for afs_syscall */ + .long sys_setfsuid16 + .long sys_setfsgid16 + .long sys_llseek /* 140 */ + .long sys_getdents + .long sys_select + .long sys_flock + .long sys_msync + .long sys_readv /* 145 */ + .long sys_writev + .long sys_getsid + .long sys_fdatasync + .long sys_sysctl + .long sys_mlock /* 150 */ + .long sys_munlock + .long sys_mlockall + .long sys_munlockall + .long sys_sched_setparam + .long sys_sched_getparam /* 155 */ + .long sys_sched_setscheduler + .long sys_sched_getscheduler + .long sys_sched_yield + .long sys_sched_get_priority_max + .long sys_sched_get_priority_min /* 160 */ + .long sys_sched_rr_get_interval + .long sys_nanosleep + .long sys_mremap + .long sys_setresuid16 + .long sys_getresuid16 /* 165 */ + .long sys_ni_syscall /* sys_vm86 */ + .long sys_ni_syscall /* Old sys_query_module */ + .long sys_poll + .long sys_ni_syscall /* Old nfsservctl */ + .long sys_setresgid16 /* 170 */ + .long sys_getresgid16 + .long sys_prctl + .long sys_rt_sigreturn + .long sys_rt_sigaction + .long sys_rt_sigprocmask /* 175 */ + .long sys_rt_sigpending + .long sys_rt_sigtimedwait + .long sys_rt_sigqueueinfo + .long sys_rt_sigsuspend + .long sys_pread64 /* 180 */ + .long sys_pwrite64 + .long sys_chown16 + .long sys_getcwd + .long sys_capget + .long sys_capset /* 185 */ + .long sys_sigaltstack + .long sys_sendfile + .long sys_ni_syscall /* streams1 */ + .long sys_ni_syscall /* streams2 */ + .long sys_vfork /* 190 */ + .long sys_getrlimit + .long sys_mmap2 + .long sys_truncate64 + .long sys_ftruncate64 + .long sys_stat64 /* 195 */ + .long sys_lstat64 + .long sys_fstat64 + .long sys_lchown + .long sys_getuid + .long sys_getgid /* 200 */ + .long sys_geteuid + .long sys_getegid + .long sys_setreuid + .long sys_setregid + .long sys_getgroups /* 205 */ + .long sys_setgroups + .long sys_fchown + .long sys_setresuid + .long sys_getresuid + .long sys_setresgid /* 210 */ + .long sys_getresgid + .long sys_chown + .long sys_setuid + .long sys_setgid + .long sys_setfsuid /* 215 */ + .long sys_setfsgid + .long sys_pivot_root + .long sys_mincore + .long sys_madvise + .long sys_getdents64 /* 220 */ + .long sys_fcntl64 + .long sys_ni_syscall /* reserved for TUX */ + .long sys_ni_syscall + .long sys_gettid + .long sys_readahead /* 225 */ + .long sys_setxattr + .long sys_lsetxattr + .long sys_fsetxattr + .long sys_getxattr + .long sys_lgetxattr /* 230 */ + .long sys_fgetxattr + .long sys_listxattr + .long sys_llistxattr + .long sys_flistxattr + .long sys_removexattr /* 235 */ + .long sys_lremovexattr + .long sys_fremovexattr + .long sys_tkill + .long sys_sendfile64 + .long sys_futex /* 240 */ + .long sys_sched_setaffinity + .long sys_sched_getaffinity + .long sys_ni_syscall /* sys_set_thread_area */ + .long sys_ni_syscall /* sys_get_thread_area */ + .long sys_io_setup /* 245 */ + .long sys_io_destroy + .long sys_io_getevents + .long sys_io_submit + .long sys_io_cancel + .long sys_fadvise64 /* 250 */ + .long sys_ni_syscall + .long sys_exit_group + .long sys_lookup_dcookie + .long sys_epoll_create + .long sys_epoll_ctl /* 255 */ + .long sys_epoll_wait + .long sys_remap_file_pages + .long sys_set_tid_address + .long sys_timer_create + .long sys_timer_settime /* 260 */ + .long sys_timer_gettime + .long sys_timer_getoverrun + .long sys_timer_delete + .long sys_clock_settime + .long sys_clock_gettime /* 265 */ + .long sys_clock_getres + .long sys_clock_nanosleep + .long sys_statfs64 + .long sys_fstatfs64 + .long sys_tgkill /* 270 */ + .long sys_utimes + .long sys_fadvise64_64 + .long sys_ni_syscall /* sys_vserver */ + .long sys_ni_syscall /* sys_mbind */ + .long sys_ni_syscall /* 275 sys_get_mempolicy */ + .long sys_ni_syscall /* sys_set_mempolicy */ + .long sys_mq_open + .long sys_mq_unlink + .long sys_mq_timedsend + .long sys_mq_timedreceive /* 280 */ + .long sys_mq_notify + .long sys_mq_getsetattr + .long sys_ni_syscall /* reserved for kexec */ + .long sys_waitid + .long sys_ni_syscall /* 285 */ /* available */ + .long sys_add_key + .long sys_request_key + .long sys_keyctl + .long sys_ioprio_set + .long sys_ioprio_get /* 290 */ + .long sys_inotify_init + .long sys_inotify_add_watch + .long sys_inotify_rm_watch + .long sys_migrate_pages + .long sys_openat /* 295 */ + .long sys_mkdirat + .long sys_mknodat + .long sys_fchownat + .long sys_futimesat + .long sys_fstatat64 /* 300 */ + .long sys_unlinkat + .long sys_renameat + .long sys_linkat + .long sys_symlinkat + .long sys_readlinkat /* 305 */ + .long sys_fchmodat + .long sys_faccessat + .long sys_pselect6 + .long sys_ppoll + .long sys_unshare /* 310 */ + .long sys_set_robust_list + .long sys_get_robust_list + .long sys_splice + .long sys_sync_file_range + .long sys_tee /* 315 */ + .long sys_vmsplice + .long sys_move_pages + .long sys_getcpu + .long sys_epoll_pwait + .long sys_utimensat /* 320 */ + .long sys_signalfd + .long sys_timerfd_create + .long sys_eventfd + .long sys_fallocate + .long sys_timerfd_settime /* 325 */ + .long sys_timerfd_gettime + .long sys_signalfd4 + .long sys_eventfd2 + .long sys_epoll_create1 + .long sys_dup3 /* 330 */ + .long sys_pipe2 + .long sys_inotify_init1 + .long sys_preadv + .long sys_pwritev + .long sys_setns /* 335 */ + .long sys_name_to_handle_at + .long sys_open_by_handle_at + .long sys_rt_tgsigqueueinfo + .long sys_perf_event_open + .long sys_recvmmsg /* 340 */ + .long sys_accept4 + .long sys_fanotify_init + .long sys_fanotify_mark + .long sys_prlimit64 + .long sys_clock_adjtime /* 345 */ + .long sys_syncfs + .long sys_sendmmsg + .long sys_process_vm_readv + .long sys_process_vm_writev + .long sys_kcmp /* 350 */ + .long sys_finit_module + + /* + * NOTE!! This doesn't have to be exact - we just have + * to make sure we have _enough_ of the "sys_ni_syscall" + * entries. Don't panic if you notice that this hasn't + * been shrunk every time we add a new system call. + */ + + .rept NR_syscalls - (.-sys_call_table) / 4 + .long sys_ni_syscall + .endr + diff --git a/arch/cris/arch-v32/kernel/fasttimer.c b/arch/cris/arch-v32/kernel/fasttimer.c new file mode 100644 index 000000000..5c84dbb99 --- /dev/null +++ b/arch/cris/arch-v32/kernel/fasttimer.c @@ -0,0 +1,793 @@ +/* + * linux/arch/cris/kernel/fasttimer.c + * + * Fast timers for ETRAX FS + * + * Copyright (C) 2000-2006 Axis Communications AB, Lund, Sweden + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/vmalloc.h> +#include <linux/interrupt.h> +#include <linux/time.h> +#include <linux/delay.h> + +#include <asm/irq.h> + +#include <hwregs/reg_map.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/timer_defs.h> +#include <asm/fasttimer.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> + +/* + * timer0 is running at 100MHz and generating jiffies timer ticks + * at 100 or 1000 HZ. + * fasttimer gives an API that gives timers that expire "between" the jiffies + * giving microsecond resolution (10 ns). + * fasttimer uses reg_timer_rw_trig register to get interrupt when + * r_time reaches a certain value. + */ + + +#define DEBUG_LOG_INCLUDED +#define FAST_TIMER_LOG +/* #define FAST_TIMER_TEST */ + +#define FAST_TIMER_SANITY_CHECKS + +#ifdef FAST_TIMER_SANITY_CHECKS +static int sanity_failed; +#endif + +#define D1(x) +#define D2(x) +#define DP(x) + +static unsigned int fast_timer_running; +static unsigned int fast_timers_added; +static unsigned int fast_timers_started; +static unsigned int fast_timers_expired; +static unsigned int fast_timers_deleted; +static unsigned int fast_timer_is_init; +static unsigned int fast_timer_ints; + +struct fast_timer *fast_timer_list = NULL; + +#ifdef DEBUG_LOG_INCLUDED +#define DEBUG_LOG_MAX 128 +static const char * debug_log_string[DEBUG_LOG_MAX]; +static unsigned long debug_log_value[DEBUG_LOG_MAX]; +static unsigned int debug_log_cnt; +static unsigned int debug_log_cnt_wrapped; + +#define DEBUG_LOG(string, value) \ +{ \ + unsigned long log_flags; \ + local_irq_save(log_flags); \ + debug_log_string[debug_log_cnt] = (string); \ + debug_log_value[debug_log_cnt] = (unsigned long)(value); \ + if (++debug_log_cnt >= DEBUG_LOG_MAX) \ + { \ + debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \ + debug_log_cnt_wrapped = 1; \ + } \ + local_irq_restore(log_flags); \ +} +#else +#define DEBUG_LOG(string, value) +#endif + + +#define NUM_TIMER_STATS 16 +#ifdef FAST_TIMER_LOG +struct fast_timer timer_added_log[NUM_TIMER_STATS]; +struct fast_timer timer_started_log[NUM_TIMER_STATS]; +struct fast_timer timer_expired_log[NUM_TIMER_STATS]; +#endif + +int timer_div_settings[NUM_TIMER_STATS]; +int timer_delay_settings[NUM_TIMER_STATS]; + +struct work_struct fast_work; + +static void +timer_trig_handler(struct work_struct *work); + + + +/* Not true gettimeofday, only checks the jiffies (uptime) + useconds */ +inline void do_gettimeofday_fast(struct fasttime_t *tv) +{ + tv->tv_jiff = jiffies; + tv->tv_usec = GET_JIFFIES_USEC(); +} + +inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1) +{ + /* Compare jiffies. Takes care of wrapping */ + if (time_before(t0->tv_jiff, t1->tv_jiff)) + return -1; + else if (time_after(t0->tv_jiff, t1->tv_jiff)) + return 1; + + /* Compare us */ + if (t0->tv_usec < t1->tv_usec) + return -1; + else if (t0->tv_usec > t1->tv_usec) + return 1; + return 0; +} + +/* Called with ints off */ +inline void start_timer_trig(unsigned long delay_us) +{ + reg_timer_rw_ack_intr ack_intr = { 0 }; + reg_timer_rw_intr_mask intr_mask; + reg_timer_rw_trig trig; + reg_timer_rw_trig_cfg trig_cfg = { 0 }; + reg_timer_r_time r_time0; + reg_timer_r_time r_time1; + unsigned char trig_wrap; + unsigned char time_wrap; + + r_time0 = REG_RD(timer, regi_timer0, r_time); + + D1(printk("start_timer_trig : %d us freq: %i div: %i\n", + delay_us, freq_index, div)); + /* Clear trig irq */ + intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask); + intr_mask.trig = 0; + REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask); + + /* Set timer values and check if trigger wraps. */ + /* r_time is 100MHz (10 ns resolution) */ + trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0; + + timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig; + timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us; + + /* Ack interrupt */ + ack_intr.trig = 1; + REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr); + + /* Start timer */ + REG_WR(timer, regi_timer0, rw_trig, trig); + trig_cfg.tmr = regk_timer_time; + REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg); + + /* Check if we have already passed the trig time */ + r_time1 = REG_RD(timer, regi_timer0, r_time); + time_wrap = r_time1 < r_time0; + + if ((trig_wrap && !time_wrap) || (r_time1 < trig)) { + /* No, Enable trig irq */ + intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask); + intr_mask.trig = 1; + REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask); + fast_timers_started++; + fast_timer_running = 1; + } else { + /* We have passed the time, disable trig point, ack intr */ + trig_cfg.tmr = regk_timer_off; + REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg); + REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr); + /* call the int routine */ + INIT_WORK(&fast_work, timer_trig_handler); + schedule_work(&fast_work); + } + +} + +/* In version 1.4 this function takes 27 - 50 us */ +void start_one_shot_timer(struct fast_timer *t, + fast_timer_function_type *function, + unsigned long data, + unsigned long delay_us, + const char *name) +{ + unsigned long flags; + struct fast_timer *tmp; + + D1(printk("sft %s %d us\n", name, delay_us)); + + local_irq_save(flags); + + do_gettimeofday_fast(&t->tv_set); + tmp = fast_timer_list; + +#ifdef FAST_TIMER_SANITY_CHECKS + /* Check so this is not in the list already... */ + while (tmp != NULL) { + if (tmp == t) { + printk(KERN_DEBUG + "timer name: %s data: 0x%08lX already " + "in list!\n", name, data); + sanity_failed++; + goto done; + } else + tmp = tmp->next; + } + tmp = fast_timer_list; +#endif + + t->delay_us = delay_us; + t->function = function; + t->data = data; + t->name = name; + + t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000; + t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ; + if (t->tv_expires.tv_usec > 1000000) { + t->tv_expires.tv_usec -= 1000000; + t->tv_expires.tv_jiff += HZ; + } +#ifdef FAST_TIMER_LOG + timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t; +#endif + fast_timers_added++; + + /* Check if this should timeout before anything else */ + if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) { + /* Put first in list and modify the timer value */ + t->prev = NULL; + t->next = fast_timer_list; + if (fast_timer_list) + fast_timer_list->prev = t; + fast_timer_list = t; +#ifdef FAST_TIMER_LOG + timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t; +#endif + start_timer_trig(delay_us); + } else { + /* Put in correct place in list */ + while (tmp->next && + fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0) + tmp = tmp->next; + /* Insert t after tmp */ + t->prev = tmp; + t->next = tmp->next; + if (tmp->next) + { + tmp->next->prev = t; + } + tmp->next = t; + } + + D2(printk("start_one_shot_timer: %d us done\n", delay_us)); + +done: + local_irq_restore(flags); +} /* start_one_shot_timer */ + +static inline int fast_timer_pending (const struct fast_timer * t) +{ + return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list); +} + +static inline int detach_fast_timer (struct fast_timer *t) +{ + struct fast_timer *next, *prev; + if (!fast_timer_pending(t)) + return 0; + next = t->next; + prev = t->prev; + if (next) + next->prev = prev; + if (prev) + prev->next = next; + else + fast_timer_list = next; + fast_timers_deleted++; + return 1; +} + +int del_fast_timer(struct fast_timer * t) +{ + unsigned long flags; + int ret; + + local_irq_save(flags); + ret = detach_fast_timer(t); + t->next = t->prev = NULL; + local_irq_restore(flags); + return ret; +} /* del_fast_timer */ + + +/* Interrupt routines or functions called in interrupt context */ + +/* Timer interrupt handler for trig interrupts */ + +static irqreturn_t +timer_trig_interrupt(int irq, void *dev_id) +{ + reg_timer_r_masked_intr masked_intr; + /* Check if the timer interrupt is for us (a trig int) */ + masked_intr = REG_RD(timer, regi_timer0, r_masked_intr); + if (!masked_intr.trig) + return IRQ_NONE; + timer_trig_handler(NULL); + return IRQ_HANDLED; +} + +static void timer_trig_handler(struct work_struct *work) +{ + reg_timer_rw_ack_intr ack_intr = { 0 }; + reg_timer_rw_intr_mask intr_mask; + reg_timer_rw_trig_cfg trig_cfg = { 0 }; + struct fast_timer *t; + unsigned long flags; + + /* We keep interrupts disabled not only when we modify the + * fast timer list, but any time we hold a reference to a + * timer in the list, since del_fast_timer may be called + * from (another) interrupt context. Thus, the only time + * when interrupts are enabled is when calling the timer + * callback function. + */ + local_irq_save(flags); + + /* Clear timer trig interrupt */ + intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask); + intr_mask.trig = 0; + REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask); + + /* First stop timer, then ack interrupt */ + /* Stop timer */ + trig_cfg.tmr = regk_timer_off; + REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg); + + /* Ack interrupt */ + ack_intr.trig = 1; + REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr); + + fast_timer_running = 0; + fast_timer_ints++; + + fast_timer_function_type *f; + unsigned long d; + + t = fast_timer_list; + while (t) { + struct fasttime_t tv; + + /* Has it really expired? */ + do_gettimeofday_fast(&tv); + D1(printk(KERN_DEBUG + "t: %is %06ius\n", tv.tv_jiff, tv.tv_usec)); + + if (fasttime_cmp(&t->tv_expires, &tv) <= 0) { + /* Yes it has expired */ +#ifdef FAST_TIMER_LOG + timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t; +#endif + fast_timers_expired++; + + /* Remove this timer before call, since it may reuse the timer */ + if (t->prev) + t->prev->next = t->next; + else + fast_timer_list = t->next; + if (t->next) + t->next->prev = t->prev; + t->prev = NULL; + t->next = NULL; + + /* Save function callback data before enabling + * interrupts, since the timer may be removed and we + * don't know how it was allocated (e.g. ->function + * and ->data may become overwritten after deletion + * if the timer was stack-allocated). + */ + f = t->function; + d = t->data; + + if (f != NULL) { + /* Run the callback function with interrupts + * enabled. */ + local_irq_restore(flags); + f(d); + local_irq_save(flags); + } else + DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints); + } else { + /* Timer is to early, let's set it again using the normal routines */ + D1(printk(".\n")); + } + + t = fast_timer_list; + if (t != NULL) { + /* Start next timer.. */ + long us = 0; + struct fasttime_t tv; + + do_gettimeofday_fast(&tv); + + /* time_after_eq takes care of wrapping */ + if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff)) + us = ((t->tv_expires.tv_jiff - tv.tv_jiff) * + 1000000 / HZ + t->tv_expires.tv_usec - + tv.tv_usec); + + if (us > 0) { + if (!fast_timer_running) { +#ifdef FAST_TIMER_LOG + timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t; +#endif + start_timer_trig(us); + } + break; + } else { + /* Timer already expired, let's handle it better late than never. + * The normal loop handles it + */ + D1(printk("e! %d\n", us)); + } + } + } + + local_irq_restore(flags); + + if (!t) + D1(printk("ttrig stop!\n")); +} + +static void wake_up_func(unsigned long data) +{ + wait_queue_head_t *sleep_wait_p = (wait_queue_head_t*)data; + wake_up(sleep_wait_p); +} + + +/* Useful API */ + +void schedule_usleep(unsigned long us) +{ + struct fast_timer t; + wait_queue_head_t sleep_wait; + init_waitqueue_head(&sleep_wait); + + D1(printk("schedule_usleep(%d)\n", us)); + start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us, + "usleep"); + /* Uninterruptible sleep on the fast timer. (The condition is + * somewhat redundant since the timer is what wakes us up.) */ + wait_event(sleep_wait, !fast_timer_pending(&t)); + + D1(printk("done schedule_usleep(%d)\n", us)); +} + +#ifdef CONFIG_PROC_FS +/* This value is very much based on testing */ +#define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300) + +static int proc_fasttimer_show(struct seq_file *m, void *v) +{ + unsigned long flags; + int i = 0; + int num_to_show; + struct fasttime_t tv; + struct fast_timer *t, *nextt; + + do_gettimeofday_fast(&tv); + + seq_printf(m, "Fast timers added: %i\n", fast_timers_added); + seq_printf(m, "Fast timers started: %i\n", fast_timers_started); + seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints); + seq_printf(m, "Fast timers expired: %i\n", fast_timers_expired); + seq_printf(m, "Fast timers deleted: %i\n", fast_timers_deleted); + seq_printf(m, "Fast timer running: %s\n", + fast_timer_running ? "yes" : "no"); + seq_printf(m, "Current time: %lu.%06lu\n", + (unsigned long)tv.tv_jiff, + (unsigned long)tv.tv_usec); +#ifdef FAST_TIMER_SANITY_CHECKS + seq_printf(m, "Sanity failed: %i\n", sanity_failed); +#endif + seq_putc(m, '\n'); + +#ifdef DEBUG_LOG_INCLUDED + { + int end_i = debug_log_cnt; + i = 0; + + if (debug_log_cnt_wrapped) + i = debug_log_cnt; + + while ((i != end_i || debug_log_cnt_wrapped)) { + seq_printf(m, debug_log_string[i], debug_log_value[i]); + if (seq_has_overflowed(m)) + return 0; + i = (i+1) % DEBUG_LOG_MAX; + } + } + seq_putc(m, '\n'); +#endif + + num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started: + NUM_TIMER_STATS); + seq_printf(m, "Timers started: %i\n", fast_timers_started); + for (i = 0; i < num_to_show; i++) { + int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS; + +#if 1 //ndef FAST_TIMER_LOG + seq_printf(m, "div: %i delay: %i\n", + timer_div_settings[cur], + timer_delay_settings[cur]); +#endif +#ifdef FAST_TIMER_LOG + t = &timer_started_log[cur]; + seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n", + t->name, + (unsigned long)t->tv_set.tv_jiff, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_jiff, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data); + if (seq_has_overflowed(m)) + return 0; +#endif + } + seq_putc(m, '\n'); + +#ifdef FAST_TIMER_LOG + num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added: + NUM_TIMER_STATS); + seq_printf(m, "Timers added: %i\n", fast_timers_added); + for (i = 0; i < num_to_show; i++) { + t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS]; + seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n", + t->name, + (unsigned long)t->tv_set.tv_jiff, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_jiff, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data); + if (seq_has_overflowed(m)) + return 0; + } + seq_putc(m, '\n'); + + num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired: + NUM_TIMER_STATS); + seq_printf(m, "Timers expired: %i\n", fast_timers_expired); + for (i = 0; i < num_to_show; i++){ + t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS]; + seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n", + t->name, + (unsigned long)t->tv_set.tv_jiff, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_jiff, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data); + if (seq_has_overflowed(m)) + return 0; + } + seq_putc(m, '\n'); +#endif + + seq_puts(m, "Active timers:\n"); + local_irq_save(flags); + t = fast_timer_list; + while (t != NULL){ + nextt = t->next; + local_irq_restore(flags); + seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n", + t->name, + (unsigned long)t->tv_set.tv_jiff, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_jiff, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data); + if (seq_has_overflowed(m)) + return 0; + local_irq_save(flags); + if (t->next != nextt) + printk("timer removed!\n"); + t = nextt; + } + local_irq_restore(flags); + return 0; +} + +static int proc_fasttimer_open(struct inode *inode, struct file *file) +{ + return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE); +} + +static const struct file_operations proc_fasttimer_fops = { + .open = proc_fasttimer_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +#endif /* PROC_FS */ + +#ifdef FAST_TIMER_TEST +static volatile unsigned long i = 0; +static volatile int num_test_timeout = 0; +static struct fast_timer tr[10]; +static int exp_num[10]; + +static struct fasttime_t tv_exp[100]; + +static void test_timeout(unsigned long data) +{ + do_gettimeofday_fast(&tv_exp[data]); + exp_num[data] = num_test_timeout; + + num_test_timeout++; +} + +static void test_timeout1(unsigned long data) +{ + do_gettimeofday_fast(&tv_exp[data]); + exp_num[data] = num_test_timeout; + if (data < 7) + { + start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1"); + i++; + } + num_test_timeout++; +} + +DP( +static char buf0[2000]; +static char buf1[2000]; +static char buf2[2000]; +static char buf3[2000]; +static char buf4[2000]; +); + +static char buf5[6000]; +static int j_u[1000]; + +static void fast_timer_test(void) +{ + int prev_num; + int j; + + struct fasttime_t tv, tv0, tv1, tv2; + + printk("fast_timer_test() start\n"); + do_gettimeofday_fast(&tv); + + for (j = 0; j < 1000; j++) + { + j_u[j] = GET_JIFFIES_USEC(); + } + for (j = 0; j < 100; j++) + { + do_gettimeofday_fast(&tv_exp[j]); + } + printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec); + + for (j = 0; j < 1000; j++) + { + printk(KERN_DEBUG "%i %i %i %i %i\n", + j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]); + j += 4; + } + for (j = 0; j < 100; j++) + { + printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n", + tv_exp[j].tv_jiff, tv_exp[j].tv_usec, + tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec, + tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec, + tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec, + tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec); + j += 4; + } + do_gettimeofday_fast(&tv0); + start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0"); + DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0)); + i++; + start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1"); + DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0)); + i++; + start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2"); + DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0)); + i++; + start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3"); + DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0)); + i++; + start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx"); + DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0)); + i++; + do_gettimeofday_fast(&tv1); + + proc_fasttimer_read(buf5, NULL, 0, 0, 0); + + prev_num = num_test_timeout; + while (num_test_timeout < i) + { + if (num_test_timeout != prev_num) + prev_num = num_test_timeout; + } + do_gettimeofday_fast(&tv2); + printk(KERN_INFO "Timers started %is %06i\n", + tv0.tv_jiff, tv0.tv_usec); + printk(KERN_INFO "Timers started at %is %06i\n", + tv1.tv_jiff, tv1.tv_usec); + printk(KERN_INFO "Timers done %is %06i\n", + tv2.tv_jiff, tv2.tv_usec); + DP(printk("buf0:\n"); + printk(buf0); + printk("buf1:\n"); + printk(buf1); + printk("buf2:\n"); + printk(buf2); + printk("buf3:\n"); + printk(buf3); + printk("buf4:\n"); + printk(buf4); + ); + printk("buf5:\n"); + printk(buf5); + + printk("timers set:\n"); + for(j = 0; j<i; j++) + { + struct fast_timer *t = &tr[j]; + printk("%-10s set: %6is %06ius exp: %6is %06ius " + "data: 0x%08X func: 0x%08X\n", + t->name, + t->tv_set.tv_jiff, + t->tv_set.tv_usec, + t->tv_expires.tv_jiff, + t->tv_expires.tv_usec, + t->data, + t->function + ); + + printk(" del: %6ius did exp: %6is %06ius as #%i error: %6li\n", + t->delay_us, + tv_exp[j].tv_jiff, + tv_exp[j].tv_usec, + exp_num[j], + (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) * + 1000000 + tv_exp[j].tv_usec - + t->tv_expires.tv_usec); + } + proc_fasttimer_read(buf5, NULL, 0, 0, 0); + printk("buf5 after all done:\n"); + printk(buf5); + printk("fast_timer_test() done\n"); +} +#endif + + +int fast_timer_init(void) +{ + /* For some reason, request_irq() hangs when called froom time_init() */ + if (!fast_timer_is_init) + { + printk("fast_timer_init()\n"); + +#ifdef CONFIG_PROC_FS + proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops); +#endif /* PROC_FS */ + if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt, + IRQF_SHARED, + "fast timer int", &fast_timer_list)) + printk(KERN_ERR "err: fasttimer irq\n"); + fast_timer_is_init = 1; +#ifdef FAST_TIMER_TEST + printk("do test\n"); + fast_timer_test(); +#endif + } + return 0; +} +__initcall(fast_timer_init); diff --git a/arch/cris/arch-v32/kernel/head.S b/arch/cris/arch-v32/kernel/head.S new file mode 100644 index 000000000..74a66e0e3 --- /dev/null +++ b/arch/cris/arch-v32/kernel/head.S @@ -0,0 +1,440 @@ +/* + * CRISv32 kernel startup code. + * + * Copyright (C) 2003, Axis Communications AB + */ + +#define ASSEMBLER_MACROS_ONLY + +/* + * The macros found in mmu_defs_asm.h uses the ## concatenation operator, so + * -traditional must not be used when assembling this file. + */ +#include <arch/memmap.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/intr_vect.h> +#include <hwregs/asm/mmu_defs_asm.h> +#include <hwregs/asm/reg_map_asm.h> +#include <mach/startup.inc> + +#define CRAMFS_MAGIC 0x28cd3d45 +#define JHEAD_MAGIC 0x1FF528A6 +#define JHEAD_SIZE 8 +#define RAM_INIT_MAGIC 0x56902387 +#define COMMAND_LINE_MAGIC 0x87109563 +#define NAND_BOOT_MAGIC 0x9a9db001 + + ;; NOTE: R8 and R9 carry information from the decompressor (if the + ;; kernel was compressed). They must not be used in the code below + ;; until they are read! + + ;; Exported symbols. + .global etrax_irv + .global romfs_start + .global romfs_length + .global romfs_in_flash + .global nand_boot + .global swapper_pg_dir + + .text +tstart: + ;; This is the entry point of the kernel. The CPU is currently in + ;; supervisor mode. + ;; + ;; 0x00000000 if flash. + ;; 0x40004000 if DRAM. + ;; + di + + START_CLOCKS + + SETUP_WAIT_STATES + + GIO_INIT + + ;; Setup and enable the MMU. Use same configuration for both the data + ;; and the instruction MMU. + ;; + ;; Note; 3 cycles is needed for a bank-select to take effect. Further; + ;; bank 1 is the instruction MMU, bank 2 is the data MMU. + +#ifdef CONFIG_CRIS_MACH_ARTPEC3 + move.d REG_FIELD(mmu, rw_mm_kbase_hi, base_e, 8) \ + | REG_FIELD(mmu, rw_mm_kbase_hi, base_c, 4) \ + | REG_FIELD(mmu, rw_mm_kbase_hi, base_d, 5) \ + | REG_FIELD(mmu, rw_mm_kbase_hi, base_b, 0xb), $r0 +#else + move.d REG_FIELD(mmu, rw_mm_kbase_hi, base_e, 8) \ + | REG_FIELD(mmu, rw_mm_kbase_hi, base_c, 4) \ + | REG_FIELD(mmu, rw_mm_kbase_hi, base_b, 0xb), $r0 +#endif + + ;; Temporary map of 0x40 -> 0x40 and 0x00 -> 0x00. + move.d REG_FIELD(mmu, rw_mm_kbase_lo, base_4, 4) \ + | REG_FIELD(mmu, rw_mm_kbase_lo, base_0, 0), $r1 + + ;; Enable certain page protections and setup linear mapping + ;; for f,e,c,b,4,0. + + ;; ARTPEC-3: + ;; c,d used for linear kernel mapping, up to 512 MB + ;; e used for vmalloc + ;; f unused, but page mapped to get page faults + + ;; ETRAX FS: + ;; c used for linear kernel mapping, up to 256 MB + ;; d used for vmalloc + ;; e,f used for memory-mapped NOR flash + +#ifdef CONFIG_CRIS_MACH_ARTPEC3 + move.d REG_STATE(mmu, rw_mm_cfg, we, on) \ + | REG_STATE(mmu, rw_mm_cfg, acc, on) \ + | REG_STATE(mmu, rw_mm_cfg, ex, on) \ + | REG_STATE(mmu, rw_mm_cfg, inv, on) \ + | REG_STATE(mmu, rw_mm_cfg, seg_f, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_e, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_d, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_c, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_b, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_a, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_9, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_8, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_7, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_6, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_5, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_4, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_3, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_2, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_1, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_0, linear), $r2 +#else + move.d REG_STATE(mmu, rw_mm_cfg, we, on) \ + | REG_STATE(mmu, rw_mm_cfg, acc, on) \ + | REG_STATE(mmu, rw_mm_cfg, ex, on) \ + | REG_STATE(mmu, rw_mm_cfg, inv, on) \ + | REG_STATE(mmu, rw_mm_cfg, seg_f, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_e, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_d, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_c, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_b, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_a, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_9, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_8, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_7, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_6, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_5, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_4, linear) \ + | REG_STATE(mmu, rw_mm_cfg, seg_3, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_2, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_1, page) \ + | REG_STATE(mmu, rw_mm_cfg, seg_0, linear), $r2 +#endif + + ;; Update instruction MMU. + move 1, $srs + nop + nop + nop + move $r0, $s2 ; kbase_hi. + move $r1, $s1 ; kbase_lo. + move $r2, $s0 ; mm_cfg, virtual memory configuration. + + ;; Update data MMU. + move 2, $srs + nop + nop + nop + move $r0, $s2 ; kbase_hi. + move $r1, $s1 ; kbase_lo + move $r2, $s0 ; mm_cfg, virtual memory configuration. + + ;; Enable data and instruction MMU. + move 0, $srs + moveq 0xf, $r0 ; IMMU, DMMU, DCache, Icache on + nop + nop + nop + move $r0, $s0 + nop + nop + nop + + ; Check if starting from DRAM (network->RAM boot or unpacked + ; compressed kernel), or directly from flash. + lapcq ., $r0 + and.d 0x7fffffff, $r0 ; Mask off the non-cache bit. + cmp.d 0x10000, $r0 ; Arbitrary, something above this code. + blo _inflash0 + nop + + jump _inram ; Jump to cached RAM. + nop + + ;; Jumpgate. +_inflash0: + jump _inflash + nop + + ;; Put the following in a section so that storage for it can be + ;; reclaimed after init is finished. + .section ".init.text", "ax" + +_inflash: + + ;; Initialize DRAM. + cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized? + beq _dram_initialized + nop + +#if defined CONFIG_ETRAXFS +#include "../mach-fs/dram_init.S" +#elif defined CONFIG_CRIS_MACH_ARTPEC3 +#include "../mach-a3/dram_init.S" +#else +#error Only ETRAXFS and ARTPEC-3 supported! +#endif + + +_dram_initialized: + ;; Copy the text and data section to DRAM. This depends on that the + ;; variables used below are correctly set up by the linker script. + ;; The calculated value stored in R4 is used below. + ;; Leave the cramfs file system (piggybacked after the kernel) in flash. + moveq 0, $r0 ; Source. + move.d text_start, $r1 ; Destination. + move.d __vmlinux_end, $r2 + move.d $r2, $r4 + sub.d $r1, $r4 +1: move.w [$r0+], $r3 + move.w $r3, [$r1+] + cmp.d $r2, $r1 + blo 1b + nop + + ;; Check for cramfs. + moveq 0, $r0 + move.d romfs_length, $r1 + move.d $r0, [$r1] + move.d [$r4], $r0 ; cramfs_super.magic + cmp.d CRAMFS_MAGIC, $r0 + bne 1f + nop + + ;; Set length and start of cramfs, set romfs_in_flash flag + addoq +4, $r4, $acr + move.d [$acr], $r0 + move.d romfs_length, $r1 + move.d $r0, [$r1] + add.d 0xf0000000, $r4 ; Add cached flash start in virtual memory. + move.d romfs_start, $r1 + move.d $r4, [$r1] +1: moveq 1, $r0 + move.d romfs_in_flash, $r1 + move.d $r0, [$r1] + + jump _start_it ; Jump to cached code. + nop + +_inram: + ;; Check if booting from NAND flash; if so, set appropriate flags + ;; and move on. + cmp.d NAND_BOOT_MAGIC, $r12 + bne move_cramfs ; not nand, jump + moveq 1, $r0 + move.d nand_boot, $r1 ; tell axisflashmap we're booting from NAND + move.d $r0, [$r1] + moveq 0, $r0 ; tell axisflashmap romfs is not in + move.d romfs_in_flash, $r1 ; (directly accessed) flash + move.d $r0, [$r1] + jump _start_it ; continue with boot + nop + +move_cramfs: + ;; kernel is in DRAM. + ;; Must figure out if there is a piggybacked rootfs image or not. + ;; Set romfs_length to 0 => no rootfs image available by default. + moveq 0, $r0 + move.d romfs_length, $r1 + move.d $r0, [$r1] + + ;; The kernel could have been unpacked to DRAM by the loader, but + ;; the cramfs image could still be in the flash immediately + ;; following the compressed kernel image. The loader passes the address + ;; of the byte succeeding the last compressed byte in the flash in + ;; register R9 when starting the kernel. + cmp.d 0x0ffffff8, $r9 + bhs _no_romfs_in_flash ; R9 points outside the flash area. + nop + ;; cramfs rootfs might to be in flash. Check for it. + move.d [$r9], $r0 ; cramfs_super.magic + cmp.d CRAMFS_MAGIC, $r0 + bne _no_romfs_in_flash + nop + + ;; found cramfs in flash. set address and size, and romfs_in_flash flag. + addoq +4, $r9, $acr + move.d [$acr], $r0 + move.d romfs_length, $r1 + move.d $r0, [$r1] + add.d 0xf0000000, $r9 ; Add cached flash start in virtual memory. + move.d romfs_start, $r1 + move.d $r9, [$r1] + moveq 1, $r0 + move.d romfs_in_flash, $r1 + move.d $r0, [$r1] + + jump _start_it ; Jump to cached code. + nop + +_no_romfs_in_flash: + ;; No romfs in flash, so look for cramfs, or jffs2 with jhead, + ;; after kernel in RAM, as is the case with network->RAM boot. + ;; For cramfs, partition starts with magic and length. + ;; For jffs2, a jhead is prepended which contains with magic and length. + ;; The jhead is not part of the jffs2 partition however. +#ifndef CONFIG_ETRAXFS_SIM + move.d __bss_start, $r0 +#else + move.d __end, $r0 +#endif + move.d [$r0], $r1 + cmp.d CRAMFS_MAGIC, $r1 ; cramfs magic? + beq 2f ; yes, jump + nop + cmp.d JHEAD_MAGIC, $r1 ; jffs2 (jhead) magic? + bne 4f ; no, skip copy + nop + addq 4, $r0 ; location of jffs2 size + move.d [$r0+], $r2 ; fetch jffs2 size -> r2 + ; r0 now points to start of jffs2 + ba 3f + nop +2: + addoq +4, $r0, $acr ; location of cramfs size + move.d [$acr], $r2 ; fetch cramfs size -> r2 + ; r0 still points to start of cramfs +3: + ;; Now, move the root fs to after kernel's BSS + + move.d _end, $r1 ; start of cramfs -> r1 + move.d romfs_start, $r3 + move.d $r1, [$r3] ; store at romfs_start (for axisflashmap) + move.d romfs_length, $r3 + move.d $r2, [$r3] ; store size at romfs_length + + add.d $r2, $r0 ; copy from end and downwards + add.d $r2, $r1 + + lsrq 1, $r2 ; Size is in bytes, we copy words. + addq 1, $r2 +1: + move.w [$r0], $r3 + move.w $r3, [$r1] + subq 2, $r0 + subq 2, $r1 + subq 1, $r2 + bne 1b + nop + +4: + ;; BSS move done. + ;; Clear romfs_in_flash flag, as we now know romfs is in DRAM + ;; Also clear nand_boot flag; if we got here, we know we've not + ;; booted from NAND flash. + moveq 0, $r0 + move.d romfs_in_flash, $r1 + move.d $r0, [$r1] + moveq 0, $r0 + move.d nand_boot, $r1 + move.d $r0, [$r1] + + jump _start_it ; Jump to cached code. + nop + +_start_it: + + ;; Check if kernel command line is supplied + cmp.d COMMAND_LINE_MAGIC, $r10 + bne no_command_line + nop + + move.d 256, $r13 + move.d cris_command_line, $r10 + or.d 0x80000000, $r11 ; Make it virtual +1: + move.b [$r11+], $r1 + move.b $r1, [$r10+] + subq 1, $r13 + bne 1b + nop + +no_command_line: + + ;; The kernel stack contains a task structure for each task. This + ;; the initial kernel stack is in the same page as the init_task, + ;; but starts at the top of the page, i.e. + 8192 bytes. + move.d init_thread_union + 8192, $sp + move.d ebp_start, $r0 ; Defined in linker-script. + move $r0, $ebp + move.d etrax_irv, $r1 ; Set the exception base register and pointer. + move.d $r0, [$r1] + + ;; Clear the BSS region from _bss_start to _end. + move.d __bss_start, $r0 + move.d _end, $r1 +1: clear.d [$r0+] + cmp.d $r1, $r0 + blo 1b + nop + + ; Initialize registers to increase determinism + move.d __bss_start, $r0 + movem [$r0], $r13 + +#ifdef CONFIG_ETRAX_L2CACHE + jsr l2cache_init + nop +#endif + + jump start_kernel ; Jump to start_kernel() in init/main.c. + nop + + .data +etrax_irv: + .dword 0 + +; Variables for communication with the Axis flash map driver (axisflashmap), +; and for setting up memory in arch/cris/kernel/setup.c . + +; romfs_start is set to the start of the root file system, if it exists +; in directly accessible memory (i.e. NOR Flash when booting from Flash, +; or RAM when booting directly from a network-downloaded RAM image) +romfs_start: + .dword 0 + +; romfs_length is set to the size of the root file system image, if it exists +; in directly accessible memory (see romfs_start). Otherwise it is set to 0. +romfs_length: + .dword 0 + +; romfs_in_flash is set to 1 if the root file system resides in directly +; accessible flash memory (i.e. NOR flash). It is set to 0 for RAM boot +; or NAND flash boot. +romfs_in_flash: + .dword 0 + +; nand_boot is set to 1 when the kernel has been booted from NAND flash +nand_boot: + .dword 0 + +swapper_pg_dir = 0xc0002000 + + .section ".init.data", "aw" + +#if defined CONFIG_ETRAXFS +#include "../mach-fs/hw_settings.S" +#elif defined CONFIG_CRIS_MACH_ARTPEC3 +#include "../mach-a3/hw_settings.S" +#else +#error Only ETRAXFS and ARTPEC-3 supported! +#endif diff --git a/arch/cris/arch-v32/kernel/irq.c b/arch/cris/arch-v32/kernel/irq.c new file mode 100644 index 000000000..6a881e0e9 --- /dev/null +++ b/arch/cris/arch-v32/kernel/irq.c @@ -0,0 +1,520 @@ +/* + * Copyright (C) 2003, Axis Communications AB. + */ + +#include <asm/irq.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/smp.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/profile.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/threads.h> +#include <linux/spinlock.h> +#include <linux/kernel_stat.h> +#include <hwregs/reg_map.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/intr_vect.h> +#include <hwregs/intr_vect_defs.h> + +#define CPU_FIXED -1 + +/* IRQ masks (refer to comment for crisv32_do_multiple) */ +#if TIMER0_INTR_VECT - FIRST_IRQ < 32 +#define TIMER_MASK (1 << (TIMER0_INTR_VECT - FIRST_IRQ)) +#undef TIMER_VECT1 +#else +#define TIMER_MASK (1 << (TIMER0_INTR_VECT - FIRST_IRQ - 32)) +#define TIMER_VECT1 +#endif +#ifdef CONFIG_ETRAX_KGDB +#if defined(CONFIG_ETRAX_KGDB_PORT0) +#define IGNOREMASK (1 << (SER0_INTR_VECT - FIRST_IRQ)) +#elif defined(CONFIG_ETRAX_KGDB_PORT1) +#define IGNOREMASK (1 << (SER1_INTR_VECT - FIRST_IRQ)) +#elif defined(CONFIG_ETRAX_KGB_PORT2) +#define IGNOREMASK (1 << (SER2_INTR_VECT - FIRST_IRQ)) +#elif defined(CONFIG_ETRAX_KGDB_PORT3) +#define IGNOREMASK (1 << (SER3_INTR_VECT - FIRST_IRQ)) +#endif +#endif + +DEFINE_SPINLOCK(irq_lock); + +struct cris_irq_allocation +{ + int cpu; /* The CPU to which the IRQ is currently allocated. */ + cpumask_t mask; /* The CPUs to which the IRQ may be allocated. */ +}; + +struct cris_irq_allocation irq_allocations[NR_REAL_IRQS] = + { [0 ... NR_REAL_IRQS - 1] = {0, CPU_MASK_ALL} }; + +static unsigned long irq_regs[NR_CPUS] = +{ + regi_irq, +}; + +#if NR_REAL_IRQS > 32 +#define NBR_REGS 2 +#else +#define NBR_REGS 1 +#endif + +unsigned long cpu_irq_counters[NR_CPUS]; +unsigned long irq_counters[NR_REAL_IRQS]; + +/* From irq.c. */ +extern void weird_irq(void); + +/* From entry.S. */ +extern void system_call(void); +extern void nmi_interrupt(void); +extern void multiple_interrupt(void); +extern void gdb_handle_exception(void); +extern void i_mmu_refill(void); +extern void i_mmu_invalid(void); +extern void i_mmu_access(void); +extern void i_mmu_execute(void); +extern void d_mmu_refill(void); +extern void d_mmu_invalid(void); +extern void d_mmu_access(void); +extern void d_mmu_write(void); + +/* From kgdb.c. */ +extern void kgdb_init(void); +extern void breakpoint(void); + +/* From traps.c. */ +extern void breakh_BUG(void); + +/* + * Build the IRQ handler stubs using macros from irq.h. + */ +#ifdef CONFIG_CRIS_MACH_ARTPEC3 +BUILD_TIMER_IRQ(0x31, 0) +#else +BUILD_IRQ(0x31) +#endif +BUILD_IRQ(0x32) +BUILD_IRQ(0x33) +BUILD_IRQ(0x34) +BUILD_IRQ(0x35) +BUILD_IRQ(0x36) +BUILD_IRQ(0x37) +BUILD_IRQ(0x38) +BUILD_IRQ(0x39) +BUILD_IRQ(0x3a) +BUILD_IRQ(0x3b) +BUILD_IRQ(0x3c) +BUILD_IRQ(0x3d) +BUILD_IRQ(0x3e) +BUILD_IRQ(0x3f) +BUILD_IRQ(0x40) +BUILD_IRQ(0x41) +BUILD_IRQ(0x42) +BUILD_IRQ(0x43) +BUILD_IRQ(0x44) +BUILD_IRQ(0x45) +BUILD_IRQ(0x46) +BUILD_IRQ(0x47) +BUILD_IRQ(0x48) +BUILD_IRQ(0x49) +BUILD_IRQ(0x4a) +#ifdef CONFIG_ETRAXFS +BUILD_TIMER_IRQ(0x4b, 0) +#else +BUILD_IRQ(0x4b) +#endif +BUILD_IRQ(0x4c) +BUILD_IRQ(0x4d) +BUILD_IRQ(0x4e) +BUILD_IRQ(0x4f) +BUILD_IRQ(0x50) +#if MACH_IRQS > 32 +BUILD_IRQ(0x51) +BUILD_IRQ(0x52) +BUILD_IRQ(0x53) +BUILD_IRQ(0x54) +BUILD_IRQ(0x55) +BUILD_IRQ(0x56) +BUILD_IRQ(0x57) +BUILD_IRQ(0x58) +BUILD_IRQ(0x59) +BUILD_IRQ(0x5a) +BUILD_IRQ(0x5b) +BUILD_IRQ(0x5c) +BUILD_IRQ(0x5d) +BUILD_IRQ(0x5e) +BUILD_IRQ(0x5f) +BUILD_IRQ(0x60) +BUILD_IRQ(0x61) +BUILD_IRQ(0x62) +BUILD_IRQ(0x63) +BUILD_IRQ(0x64) +BUILD_IRQ(0x65) +BUILD_IRQ(0x66) +BUILD_IRQ(0x67) +BUILD_IRQ(0x68) +BUILD_IRQ(0x69) +BUILD_IRQ(0x6a) +BUILD_IRQ(0x6b) +BUILD_IRQ(0x6c) +BUILD_IRQ(0x6d) +BUILD_IRQ(0x6e) +BUILD_IRQ(0x6f) +BUILD_IRQ(0x70) +#endif + +/* Pointers to the low-level handlers. */ +static void (*interrupt[MACH_IRQS])(void) = { + IRQ0x31_interrupt, IRQ0x32_interrupt, IRQ0x33_interrupt, + IRQ0x34_interrupt, IRQ0x35_interrupt, IRQ0x36_interrupt, + IRQ0x37_interrupt, IRQ0x38_interrupt, IRQ0x39_interrupt, + IRQ0x3a_interrupt, IRQ0x3b_interrupt, IRQ0x3c_interrupt, + IRQ0x3d_interrupt, IRQ0x3e_interrupt, IRQ0x3f_interrupt, + IRQ0x40_interrupt, IRQ0x41_interrupt, IRQ0x42_interrupt, + IRQ0x43_interrupt, IRQ0x44_interrupt, IRQ0x45_interrupt, + IRQ0x46_interrupt, IRQ0x47_interrupt, IRQ0x48_interrupt, + IRQ0x49_interrupt, IRQ0x4a_interrupt, IRQ0x4b_interrupt, + IRQ0x4c_interrupt, IRQ0x4d_interrupt, IRQ0x4e_interrupt, + IRQ0x4f_interrupt, IRQ0x50_interrupt, +#if MACH_IRQS > 32 + IRQ0x51_interrupt, IRQ0x52_interrupt, IRQ0x53_interrupt, + IRQ0x54_interrupt, IRQ0x55_interrupt, IRQ0x56_interrupt, + IRQ0x57_interrupt, IRQ0x58_interrupt, IRQ0x59_interrupt, + IRQ0x5a_interrupt, IRQ0x5b_interrupt, IRQ0x5c_interrupt, + IRQ0x5d_interrupt, IRQ0x5e_interrupt, IRQ0x5f_interrupt, + IRQ0x60_interrupt, IRQ0x61_interrupt, IRQ0x62_interrupt, + IRQ0x63_interrupt, IRQ0x64_interrupt, IRQ0x65_interrupt, + IRQ0x66_interrupt, IRQ0x67_interrupt, IRQ0x68_interrupt, + IRQ0x69_interrupt, IRQ0x6a_interrupt, IRQ0x6b_interrupt, + IRQ0x6c_interrupt, IRQ0x6d_interrupt, IRQ0x6e_interrupt, + IRQ0x6f_interrupt, IRQ0x70_interrupt, +#endif +}; + +void +block_irq(int irq, int cpu) +{ + int intr_mask; + unsigned long flags; + + spin_lock_irqsave(&irq_lock, flags); + /* Remember, 1 let thru, 0 block. */ + if (irq - FIRST_IRQ < 32) { + intr_mask = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], + rw_mask, 0); + intr_mask &= ~(1 << (irq - FIRST_IRQ)); + REG_WR_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, + 0, intr_mask); + } else { + intr_mask = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], + rw_mask, 1); + intr_mask &= ~(1 << (irq - FIRST_IRQ - 32)); + REG_WR_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, + 1, intr_mask); + } + spin_unlock_irqrestore(&irq_lock, flags); +} + +void +unblock_irq(int irq, int cpu) +{ + int intr_mask; + unsigned long flags; + + spin_lock_irqsave(&irq_lock, flags); + /* Remember, 1 let thru, 0 block. */ + if (irq - FIRST_IRQ < 32) { + intr_mask = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], + rw_mask, 0); + intr_mask |= (1 << (irq - FIRST_IRQ)); + REG_WR_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, + 0, intr_mask); + } else { + intr_mask = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], + rw_mask, 1); + intr_mask |= (1 << (irq - FIRST_IRQ - 32)); + REG_WR_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, + 1, intr_mask); + } + spin_unlock_irqrestore(&irq_lock, flags); +} + +/* Find out which CPU the irq should be allocated to. */ +static int irq_cpu(int irq) +{ + int cpu; + unsigned long flags; + + spin_lock_irqsave(&irq_lock, flags); + cpu = irq_allocations[irq - FIRST_IRQ].cpu; + + /* Fixed interrupts stay on the local CPU. */ + if (cpu == CPU_FIXED) + { + spin_unlock_irqrestore(&irq_lock, flags); + return smp_processor_id(); + } + + + /* Let the interrupt stay if possible */ + if (cpumask_test_cpu(cpu, &irq_allocations[irq - FIRST_IRQ].mask)) + goto out; + + /* IRQ must be moved to another CPU. */ + cpu = cpumask_first(&irq_allocations[irq - FIRST_IRQ].mask); + irq_allocations[irq - FIRST_IRQ].cpu = cpu; +out: + spin_unlock_irqrestore(&irq_lock, flags); + return cpu; +} + +void crisv32_mask_irq(int irq) +{ + int cpu; + + for (cpu = 0; cpu < NR_CPUS; cpu++) + block_irq(irq, cpu); +} + +void crisv32_unmask_irq(int irq) +{ + unblock_irq(irq, irq_cpu(irq)); +} + + +static void enable_crisv32_irq(struct irq_data *data) +{ + crisv32_unmask_irq(data->irq); +} + +static void disable_crisv32_irq(struct irq_data *data) +{ + crisv32_mask_irq(data->irq); +} + +static int set_affinity_crisv32_irq(struct irq_data *data, + const struct cpumask *dest, bool force) +{ + unsigned long flags; + + spin_lock_irqsave(&irq_lock, flags); + irq_allocations[data->irq - FIRST_IRQ].mask = *dest; + spin_unlock_irqrestore(&irq_lock, flags); + return 0; +} + +static struct irq_chip crisv32_irq_type = { + .name = "CRISv32", + .irq_shutdown = disable_crisv32_irq, + .irq_enable = enable_crisv32_irq, + .irq_disable = disable_crisv32_irq, + .irq_set_affinity = set_affinity_crisv32_irq, +}; + +void +set_exception_vector(int n, irqvectptr addr) +{ + etrax_irv->v[n] = (irqvectptr) addr; +} + +extern void do_IRQ(int irq, struct pt_regs * regs); + +void +crisv32_do_IRQ(int irq, int block, struct pt_regs* regs) +{ + /* Interrupts that may not be moved to another CPU may + * skip blocking. This is currently only valid for the + * timer IRQ and the IPI and is used for the timer + * interrupt to avoid watchdog starvation. + */ + if (!block) { + do_IRQ(irq, regs); + return; + } + + block_irq(irq, smp_processor_id()); + do_IRQ(irq, regs); + + unblock_irq(irq, irq_cpu(irq)); +} + +/* If multiple interrupts occur simultaneously we get a multiple + * interrupt from the CPU and software has to sort out which + * interrupts that happened. There are two special cases here: + * + * 1. Timer interrupts may never be blocked because of the + * watchdog (refer to comment in include/asr/arch/irq.h) + * 2. GDB serial port IRQs are unhandled here and will be handled + * as a single IRQ when it strikes again because the GDB + * stubb wants to save the registers in its own fashion. + */ +void +crisv32_do_multiple(struct pt_regs* regs) +{ + int cpu; + int mask; + int masked[NBR_REGS]; + int bit; + int i; + + cpu = smp_processor_id(); + + /* An extra irq_enter here to prevent softIRQs to run after + * each do_IRQ. This will decrease the interrupt latency. + */ + irq_enter(); + + for (i = 0; i < NBR_REGS; i++) { + /* Get which IRQs that happened. */ + masked[i] = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], + r_masked_vect, i); + + /* Calculate new IRQ mask with these IRQs disabled. */ + mask = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, i); + mask &= ~masked[i]; + + /* Timer IRQ is never masked */ +#ifdef TIMER_VECT1 + if ((i == 1) && (masked[0] & TIMER_MASK)) + mask |= TIMER_MASK; +#else + if ((i == 0) && (masked[0] & TIMER_MASK)) + mask |= TIMER_MASK; +#endif + /* Block all the IRQs */ + REG_WR_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, i, mask); + + /* Check for timer IRQ and handle it special. */ +#ifdef TIMER_VECT1 + if ((i == 1) && (masked[i] & TIMER_MASK)) { + masked[i] &= ~TIMER_MASK; + do_IRQ(TIMER0_INTR_VECT, regs); + } +#else + if ((i == 0) && (masked[i] & TIMER_MASK)) { + masked[i] &= ~TIMER_MASK; + do_IRQ(TIMER0_INTR_VECT, regs); + } +#endif + } + +#ifdef IGNORE_MASK + /* Remove IRQs that can't be handled as multiple. */ + masked[0] &= ~IGNORE_MASK; +#endif + + /* Handle the rest of the IRQs. */ + for (i = 0; i < NBR_REGS; i++) { + for (bit = 0; bit < 32; bit++) { + if (masked[i] & (1 << bit)) + do_IRQ(bit + FIRST_IRQ + i*32, regs); + } + } + + /* Unblock all the IRQs. */ + for (i = 0; i < NBR_REGS; i++) { + mask = REG_RD_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, i); + mask |= masked[i]; + REG_WR_INT_VECT(intr_vect, irq_regs[cpu], rw_mask, i, mask); + } + + /* This irq_exit() will trigger the soft IRQs. */ + irq_exit(); +} + +static int crisv32_irq_map(struct irq_domain *h, unsigned int virq, + irq_hw_number_t hw_irq_num) +{ + irq_set_chip_and_handler(virq, &crisv32_irq_type, handle_simple_irq); + + return 0; +} + +static struct irq_domain_ops crisv32_irq_ops = { + .map = crisv32_irq_map, + .xlate = irq_domain_xlate_onecell, +}; + +/* + * This is called by start_kernel. It fixes the IRQ masks and setup the + * interrupt vector table to point to bad_interrupt pointers. + */ +void __init +init_IRQ(void) +{ + int i; + int j; + reg_intr_vect_rw_mask vect_mask = {0}; + struct device_node *np; + struct irq_domain *domain; + + /* Clear all interrupts masks. */ + for (i = 0; i < NBR_REGS; i++) + REG_WR_VECT(intr_vect, regi_irq, rw_mask, i, vect_mask); + + for (i = 0; i < 256; i++) + etrax_irv->v[i] = weird_irq; + + np = of_find_compatible_node(NULL, NULL, "axis,crisv32-intc"); + domain = irq_domain_add_legacy(np, NR_IRQS - FIRST_IRQ, + FIRST_IRQ, FIRST_IRQ, + &crisv32_irq_ops, NULL); + BUG_ON(!domain); + irq_set_default_host(domain); + of_node_put(np); + + for (i = FIRST_IRQ, j = 0; j < NR_IRQS; i++, j++) { + set_exception_vector(i, interrupt[j]); + } + + /* Mark Timer and IPI IRQs as CPU local */ + irq_allocations[TIMER0_INTR_VECT - FIRST_IRQ].cpu = CPU_FIXED; + irq_set_status_flags(TIMER0_INTR_VECT, IRQ_PER_CPU); + irq_allocations[IPI_INTR_VECT - FIRST_IRQ].cpu = CPU_FIXED; + irq_set_status_flags(IPI_INTR_VECT, IRQ_PER_CPU); + + set_exception_vector(0x00, nmi_interrupt); + set_exception_vector(0x30, multiple_interrupt); + + /* Set up handler for various MMU bus faults. */ + set_exception_vector(0x04, i_mmu_refill); + set_exception_vector(0x05, i_mmu_invalid); + set_exception_vector(0x06, i_mmu_access); + set_exception_vector(0x07, i_mmu_execute); + set_exception_vector(0x08, d_mmu_refill); + set_exception_vector(0x09, d_mmu_invalid); + set_exception_vector(0x0a, d_mmu_access); + set_exception_vector(0x0b, d_mmu_write); + +#ifdef CONFIG_BUG + /* Break 14 handler, used to implement cheap BUG(). */ + set_exception_vector(0x1e, breakh_BUG); +#endif + + /* The system-call trap is reached by "break 13". */ + set_exception_vector(0x1d, system_call); + + /* Exception handlers for debugging, both user-mode and kernel-mode. */ + + /* Break 8. */ + set_exception_vector(0x18, gdb_handle_exception); + /* Hardware single step. */ + set_exception_vector(0x3, gdb_handle_exception); + /* Hardware breakpoint. */ + set_exception_vector(0xc, gdb_handle_exception); + +#ifdef CONFIG_ETRAX_KGDB + kgdb_init(); + /* Everything is set up; now trap the kernel. */ + breakpoint(); +#endif +} + diff --git a/arch/cris/arch-v32/kernel/kgdb.c b/arch/cris/arch-v32/kernel/kgdb.c new file mode 100644 index 000000000..b06813aeb --- /dev/null +++ b/arch/cris/arch-v32/kernel/kgdb.c @@ -0,0 +1,1612 @@ +/* + * arch/cris/arch-v32/kernel/kgdb.c + * + * CRIS v32 version by Orjan Friberg, Axis Communications AB. + * + * S390 version + * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), + * + * Originally written by Glenn Engel, Lake Stevens Instrument Division + * + * Contributed by HP Systems + * + * Modified for SPARC by Stu Grossman, Cygnus Support. + * + * Modified for Linux/MIPS (and MIPS in general) by Andreas Busse + * Send complaints, suggestions etc. to <andy@waldorf-gmbh.de> + * + * Copyright (C) 1995 Andreas Busse + */ + +/* FIXME: Check the documentation. */ + +/* + * kgdb usage notes: + * ----------------- + * + * If you select CONFIG_ETRAX_KGDB in the configuration, the kernel will be + * built with different gcc flags: "-g" is added to get debug infos, and + * "-fomit-frame-pointer" is omitted to make debugging easier. Since the + * resulting kernel will be quite big (approx. > 7 MB), it will be stripped + * before compresion. Such a kernel will behave just as usually, except if + * given a "debug=<device>" command line option. (Only serial devices are + * allowed for <device>, i.e. no printers or the like; possible values are + * machine depedend and are the same as for the usual debug device, the one + * for logging kernel messages.) If that option is given and the device can be + * initialized, the kernel will connect to the remote gdb in trap_init(). The + * serial parameters are fixed to 8N1 and 115200 bps, for easyness of + * implementation. + * + * To start a debugging session, start that gdb with the debugging kernel + * image (the one with the symbols, vmlinux.debug) named on the command line. + * This file will be used by gdb to get symbol and debugging infos about the + * kernel. Next, select remote debug mode by + * target remote <device> + * where <device> is the name of the serial device over which the debugged + * machine is connected. Maybe you have to adjust the baud rate by + * set remotebaud <rate> + * or also other parameters with stty: + * shell stty ... </dev/... + * If the kernel to debug has already booted, it waited for gdb and now + * connects, and you'll see a breakpoint being reported. If the kernel isn't + * running yet, start it now. The order of gdb and the kernel doesn't matter. + * Another thing worth knowing about in the getting-started phase is how to + * debug the remote protocol itself. This is activated with + * set remotedebug 1 + * gdb will then print out each packet sent or received. You'll also get some + * messages about the gdb stub on the console of the debugged machine. + * + * If all that works, you can use lots of the usual debugging techniques on + * the kernel, e.g. inspecting and changing variables/memory, setting + * breakpoints, single stepping and so on. It's also possible to interrupt the + * debugged kernel by pressing C-c in gdb. Have fun! :-) + * + * The gdb stub is entered (and thus the remote gdb gets control) in the + * following situations: + * + * - If breakpoint() is called. This is just after kgdb initialization, or if + * a breakpoint() call has been put somewhere into the kernel source. + * (Breakpoints can of course also be set the usual way in gdb.) + * In eLinux, we call breakpoint() in init/main.c after IRQ initialization. + * + * - If there is a kernel exception, i.e. bad_super_trap() or die_if_kernel() + * are entered. All the CPU exceptions are mapped to (more or less..., see + * the hard_trap_info array below) appropriate signal, which are reported + * to gdb. die_if_kernel() is usually called after some kind of access + * error and thus is reported as SIGSEGV. + * + * - When panic() is called. This is reported as SIGABRT. + * + * - If C-c is received over the serial line, which is treated as + * SIGINT. + * + * Of course, all these signals are just faked for gdb, since there is no + * signal concept as such for the kernel. It also isn't possible --obviously-- + * to set signal handlers from inside gdb, or restart the kernel with a + * signal. + * + * Current limitations: + * + * - While the kernel is stopped, interrupts are disabled for safety reasons + * (i.e., variables not changing magically or the like). But this also + * means that the clock isn't running anymore, and that interrupts from the + * hardware may get lost/not be served in time. This can cause some device + * errors... + * + * - When single-stepping, only one instruction of the current thread is + * executed, but interrupts are allowed for that time and will be serviced + * if pending. Be prepared for that. + * + * - All debugging happens in kernel virtual address space. There's no way to + * access physical memory not mapped in kernel space, or to access user + * space. A way to work around this is using get_user_long & Co. in gdb + * expressions, but only for the current process. + * + * - Interrupting the kernel only works if interrupts are currently allowed, + * and the interrupt of the serial line isn't blocked by some other means + * (IPL too high, disabled, ...) + * + * - The gdb stub is currently not reentrant, i.e. errors that happen therein + * (e.g. accessing invalid memory) may not be caught correctly. This could + * be removed in future by introducing a stack of struct registers. + * + */ + +/* + * To enable debugger support, two things need to happen. One, a + * call to kgdb_init() is necessary in order to allow any breakpoints + * or error conditions to be properly intercepted and reported to gdb. + * Two, a breakpoint needs to be generated to begin communication. This + * is most easily accomplished by a call to breakpoint(). + * + * The following gdb commands are supported: + * + * command function Return value + * + * g return the value of the CPU registers hex data or ENN + * G set the value of the CPU registers OK or ENN + * + * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN + * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN + * + * c Resume at current address SNN ( signal NN) + * cAA..AA Continue at address AA..AA SNN + * + * s Step one instruction SNN + * sAA..AA Step one instruction from AA..AA SNN + * + * k kill + * + * ? What was the last sigval ? SNN (signal NN) + * + * bBB..BB Set baud rate to BB..BB OK or BNN, then sets + * baud rate + * + * All commands and responses are sent with a packet which includes a + * checksum. A packet consists of + * + * $<packet info>#<checksum>. + * + * where + * <packet info> :: <characters representing the command or response> + * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> + * + * When a packet is received, it is first acknowledged with either '+' or '-'. + * '+' indicates a successful transfer. '-' indicates a failed transfer. + * + * Example: + * + * Host: Reply: + * $m0,10#2a +$00010203040506070809101112131415#42 + * + */ + + +#include <linux/string.h> +#include <linux/signal.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/linkage.h> +#include <linux/reboot.h> + +#include <asm/setup.h> +#include <asm/ptrace.h> + +#include <asm/irq.h> +#include <hwregs/reg_map.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/intr_vect_defs.h> +#include <hwregs/ser_defs.h> + +/* From entry.S. */ +extern void gdb_handle_exception(void); +/* From kgdb_asm.S. */ +extern void kgdb_handle_exception(void); + +static int kgdb_started = 0; + +/********************************* Register image ****************************/ + +typedef +struct register_image +{ + /* Offset */ + unsigned int r0; /* 0x00 */ + unsigned int r1; /* 0x04 */ + unsigned int r2; /* 0x08 */ + unsigned int r3; /* 0x0C */ + unsigned int r4; /* 0x10 */ + unsigned int r5; /* 0x14 */ + unsigned int r6; /* 0x18 */ + unsigned int r7; /* 0x1C */ + unsigned int r8; /* 0x20; Frame pointer (if any) */ + unsigned int r9; /* 0x24 */ + unsigned int r10; /* 0x28 */ + unsigned int r11; /* 0x2C */ + unsigned int r12; /* 0x30 */ + unsigned int r13; /* 0x34 */ + unsigned int sp; /* 0x38; R14, Stack pointer */ + unsigned int acr; /* 0x3C; R15, Address calculation register. */ + + unsigned char bz; /* 0x40; P0, 8-bit zero register */ + unsigned char vr; /* 0x41; P1, Version register (8-bit) */ + unsigned int pid; /* 0x42; P2, Process ID */ + unsigned char srs; /* 0x46; P3, Support register select (8-bit) */ + unsigned short wz; /* 0x47; P4, 16-bit zero register */ + unsigned int exs; /* 0x49; P5, Exception status */ + unsigned int eda; /* 0x4D; P6, Exception data address */ + unsigned int mof; /* 0x51; P7, Multiply overflow register */ + unsigned int dz; /* 0x55; P8, 32-bit zero register */ + unsigned int ebp; /* 0x59; P9, Exception base pointer */ + unsigned int erp; /* 0x5D; P10, Exception return pointer. Contains the PC we are interested in. */ + unsigned int srp; /* 0x61; P11, Subroutine return pointer */ + unsigned int nrp; /* 0x65; P12, NMI return pointer */ + unsigned int ccs; /* 0x69; P13, Condition code stack */ + unsigned int usp; /* 0x6D; P14, User mode stack pointer */ + unsigned int spc; /* 0x71; P15, Single step PC */ + unsigned int pc; /* 0x75; Pseudo register (for the most part set to ERP). */ + +} registers; + +typedef +struct bp_register_image +{ + /* Support register bank 0. */ + unsigned int s0_0; + unsigned int s1_0; + unsigned int s2_0; + unsigned int s3_0; + unsigned int s4_0; + unsigned int s5_0; + unsigned int s6_0; + unsigned int s7_0; + unsigned int s8_0; + unsigned int s9_0; + unsigned int s10_0; + unsigned int s11_0; + unsigned int s12_0; + unsigned int s13_0; + unsigned int s14_0; + unsigned int s15_0; + + /* Support register bank 1. */ + unsigned int s0_1; + unsigned int s1_1; + unsigned int s2_1; + unsigned int s3_1; + unsigned int s4_1; + unsigned int s5_1; + unsigned int s6_1; + unsigned int s7_1; + unsigned int s8_1; + unsigned int s9_1; + unsigned int s10_1; + unsigned int s11_1; + unsigned int s12_1; + unsigned int s13_1; + unsigned int s14_1; + unsigned int s15_1; + + /* Support register bank 2. */ + unsigned int s0_2; + unsigned int s1_2; + unsigned int s2_2; + unsigned int s3_2; + unsigned int s4_2; + unsigned int s5_2; + unsigned int s6_2; + unsigned int s7_2; + unsigned int s8_2; + unsigned int s9_2; + unsigned int s10_2; + unsigned int s11_2; + unsigned int s12_2; + unsigned int s13_2; + unsigned int s14_2; + unsigned int s15_2; + + /* Support register bank 3. */ + unsigned int s0_3; /* BP_CTRL */ + unsigned int s1_3; /* BP_I0_START */ + unsigned int s2_3; /* BP_I0_END */ + unsigned int s3_3; /* BP_D0_START */ + unsigned int s4_3; /* BP_D0_END */ + unsigned int s5_3; /* BP_D1_START */ + unsigned int s6_3; /* BP_D1_END */ + unsigned int s7_3; /* BP_D2_START */ + unsigned int s8_3; /* BP_D2_END */ + unsigned int s9_3; /* BP_D3_START */ + unsigned int s10_3; /* BP_D3_END */ + unsigned int s11_3; /* BP_D4_START */ + unsigned int s12_3; /* BP_D4_END */ + unsigned int s13_3; /* BP_D5_START */ + unsigned int s14_3; /* BP_D5_END */ + unsigned int s15_3; /* BP_RESERVED */ + +} support_registers; + +enum register_name +{ + R0, R1, R2, R3, + R4, R5, R6, R7, + R8, R9, R10, R11, + R12, R13, SP, ACR, + + BZ, VR, PID, SRS, + WZ, EXS, EDA, MOF, + DZ, EBP, ERP, SRP, + NRP, CCS, USP, SPC, + PC, + + S0, S1, S2, S3, + S4, S5, S6, S7, + S8, S9, S10, S11, + S12, S13, S14, S15 + +}; + +/* The register sizes of the registers in register_name. An unimplemented register + is designated by size 0 in this array. */ +static int register_size[] = +{ + 4, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4, 4, + + 1, 1, 4, 1, + 2, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4, 4, + + 4, + + 4, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4 + +}; + +/* Contains the register image of the kernel. + (Global so that they can be reached from assembler code.) */ +registers reg; +support_registers sreg; + +/************** Prototypes for local library functions ***********************/ + +/* Copy of strcpy from libc. */ +static char *gdb_cris_strcpy(char *s1, const char *s2); + +/* Copy of strlen from libc. */ +static int gdb_cris_strlen(const char *s); + +/* Copy of memchr from libc. */ +static void *gdb_cris_memchr(const void *s, int c, int n); + +/* Copy of strtol from libc. Does only support base 16. */ +static int gdb_cris_strtol(const char *s, char **endptr, int base); + +/********************** Prototypes for local functions. **********************/ + +/* Write a value to a specified register regno in the register image + of the current thread. */ +static int write_register(int regno, char *val); + +/* Read a value from a specified register in the register image. Returns the + status of the read operation. The register value is returned in valptr. */ +static int read_register(char regno, unsigned int *valptr); + +/* Serial port, reads one character. ETRAX 100 specific. from debugport.c */ +int getDebugChar(void); + +/* Serial port, writes one character. ETRAX 100 specific. from debugport.c */ +void putDebugChar(int val); + +/* Returns the integer equivalent of a hexadecimal character. */ +static int hex(char ch); + +/* Convert the memory, pointed to by mem into hexadecimal representation. + Put the result in buf, and return a pointer to the last character + in buf (null). */ +static char *mem2hex(char *buf, unsigned char *mem, int count); + +/* Convert the array, in hexadecimal representation, pointed to by buf into + binary representation. Put the result in mem, and return a pointer to + the character after the last byte written. */ +static unsigned char *hex2mem(unsigned char *mem, char *buf, int count); + +/* Put the content of the array, in binary representation, pointed to by buf + into memory pointed to by mem, and return a pointer to + the character after the last byte written. */ +static unsigned char *bin2mem(unsigned char *mem, unsigned char *buf, int count); + +/* Await the sequence $<data>#<checksum> and store <data> in the array buffer + returned. */ +static void getpacket(char *buffer); + +/* Send $<data>#<checksum> from the <data> in the array buffer. */ +static void putpacket(char *buffer); + +/* Build and send a response packet in order to inform the host the + stub is stopped. */ +static void stub_is_stopped(int sigval); + +/* All expected commands are sent from remote.c. Send a response according + to the description in remote.c. Not static since it needs to be reached + from assembler code. */ +void handle_exception(int sigval); + +/* Performs a complete re-start from scratch. ETRAX specific. */ +static void kill_restart(void); + +/******************** Prototypes for global functions. ***********************/ + +/* The string str is prepended with the GDB printout token and sent. */ +void putDebugString(const unsigned char *str, int len); + +/* A static breakpoint to be used at startup. */ +void breakpoint(void); + +/* Avoid warning as the internal_stack is not used in the C-code. */ +#define USEDVAR(name) { if (name) { ; } } +#define USEDFUN(name) { void (*pf)(void) = (void *)name; USEDVAR(pf) } + +/********************************** Packet I/O ******************************/ +/* BUFMAX defines the maximum number of characters in + inbound/outbound buffers */ +/* FIXME: How do we know it's enough? */ +#define BUFMAX 512 + +/* Run-length encoding maximum length. Send 64 at most. */ +#define RUNLENMAX 64 + +/* The inbound/outbound buffers used in packet I/O */ +static char input_buffer[BUFMAX]; +static char output_buffer[BUFMAX]; + +/* Error and warning messages. */ +enum error_type +{ + SUCCESS, E01, E02, E03, E04, E05, E06, +}; + +static char *error_message[] = +{ + "", + "E01 Set current or general thread - H[c,g] - internal error.", + "E02 Change register content - P - cannot change read-only register.", + "E03 Thread is not alive.", /* T, not used. */ + "E04 The command is not supported - [s,C,S,!,R,d,r] - internal error.", + "E05 Change register content - P - the register is not implemented..", + "E06 Change memory content - M - internal error.", +}; + +/********************************** Breakpoint *******************************/ +/* Use an internal stack in the breakpoint and interrupt response routines. + FIXME: How do we know the size of this stack is enough? + Global so it can be reached from assembler code. */ +#define INTERNAL_STACK_SIZE 1024 +char internal_stack[INTERNAL_STACK_SIZE]; + +/* Due to the breakpoint return pointer, a state variable is needed to keep + track of whether it is a static (compiled) or dynamic (gdb-invoked) + breakpoint to be handled. A static breakpoint uses the content of register + ERP as it is whereas a dynamic breakpoint requires subtraction with 2 + in order to execute the instruction. The first breakpoint is static; all + following are assumed to be dynamic. */ +static int dynamic_bp = 0; + +/********************************* String library ****************************/ +/* Single-step over library functions creates trap loops. */ + +/* Copy char s2[] to s1[]. */ +static char* +gdb_cris_strcpy(char *s1, const char *s2) +{ + char *s = s1; + + for (s = s1; (*s++ = *s2++) != '\0'; ) + ; + return s1; +} + +/* Find length of s[]. */ +static int +gdb_cris_strlen(const char *s) +{ + const char *sc; + + for (sc = s; *sc != '\0'; sc++) + ; + return (sc - s); +} + +/* Find first occurrence of c in s[n]. */ +static void* +gdb_cris_memchr(const void *s, int c, int n) +{ + const unsigned char uc = c; + const unsigned char *su; + + for (su = s; 0 < n; ++su, --n) + if (*su == uc) + return (void *)su; + return NULL; +} +/******************************* Standard library ****************************/ +/* Single-step over library functions creates trap loops. */ +/* Convert string to long. */ +static int +gdb_cris_strtol(const char *s, char **endptr, int base) +{ + char *s1; + char *sd; + int x = 0; + + for (s1 = (char*)s; (sd = gdb_cris_memchr(hex_asc, *s1, base)) != NULL; ++s1) + x = x * base + (sd - hex_asc); + + if (endptr) { + /* Unconverted suffix is stored in endptr unless endptr is NULL. */ + *endptr = s1; + } + + return x; +} + +/********************************* Register image ****************************/ + +/* Write a value to a specified register in the register image of the current + thread. Returns status code SUCCESS, E02 or E05. */ +static int +write_register(int regno, char *val) +{ + int status = SUCCESS; + + if (regno >= R0 && regno <= ACR) { + /* Consecutive 32-bit registers. */ + hex2mem((unsigned char *)®.r0 + (regno - R0) * sizeof(unsigned int), + val, sizeof(unsigned int)); + + } else if (regno == BZ || regno == VR || regno == WZ || regno == DZ) { + /* Read-only registers. */ + status = E02; + + } else if (regno == PID) { + /* 32-bit register. (Even though we already checked SRS and WZ, we cannot + combine this with the EXS - SPC write since SRS and WZ have different size.) */ + hex2mem((unsigned char *)®.pid, val, sizeof(unsigned int)); + + } else if (regno == SRS) { + /* 8-bit register. */ + hex2mem((unsigned char *)®.srs, val, sizeof(unsigned char)); + + } else if (regno >= EXS && regno <= SPC) { + /* Consecutive 32-bit registers. */ + hex2mem((unsigned char *)®.exs + (regno - EXS) * sizeof(unsigned int), + val, sizeof(unsigned int)); + + } else if (regno == PC) { + /* Pseudo-register. Treat as read-only. */ + status = E02; + + } else if (regno >= S0 && regno <= S15) { + /* 32-bit registers. */ + hex2mem((unsigned char *)&sreg.s0_0 + (reg.srs * 16 * sizeof(unsigned int)) + (regno - S0) * sizeof(unsigned int), val, sizeof(unsigned int)); + } else { + /* Non-existing register. */ + status = E05; + } + return status; +} + +/* Read a value from a specified register in the register image. Returns the + value in the register or -1 for non-implemented registers. */ +static int +read_register(char regno, unsigned int *valptr) +{ + int status = SUCCESS; + + /* We read the zero registers from the register struct (instead of just returning 0) + to catch errors. */ + + if (regno >= R0 && regno <= ACR) { + /* Consecutive 32-bit registers. */ + *valptr = *(unsigned int *)((char *)®.r0 + (regno - R0) * sizeof(unsigned int)); + + } else if (regno == BZ || regno == VR) { + /* Consecutive 8-bit registers. */ + *valptr = (unsigned int)(*(unsigned char *) + ((char *)®.bz + (regno - BZ) * sizeof(char))); + + } else if (regno == PID) { + /* 32-bit register. */ + *valptr = *(unsigned int *)((char *)®.pid); + + } else if (regno == SRS) { + /* 8-bit register. */ + *valptr = (unsigned int)(*(unsigned char *)((char *)®.srs)); + + } else if (regno == WZ) { + /* 16-bit register. */ + *valptr = (unsigned int)(*(unsigned short *)(char *)®.wz); + + } else if (regno >= EXS && regno <= PC) { + /* Consecutive 32-bit registers. */ + *valptr = *(unsigned int *)((char *)®.exs + (regno - EXS) * sizeof(unsigned int)); + + } else if (regno >= S0 && regno <= S15) { + /* Consecutive 32-bit registers, located elsewhere. */ + *valptr = *(unsigned int *)((char *)&sreg.s0_0 + (reg.srs * 16 * sizeof(unsigned int)) + (regno - S0) * sizeof(unsigned int)); + + } else { + /* Non-existing register. */ + status = E05; + } + return status; + +} + +/********************************** Packet I/O ******************************/ +/* Returns the integer equivalent of a hexadecimal character. */ +static int +hex(char ch) +{ + if ((ch >= 'a') && (ch <= 'f')) + return (ch - 'a' + 10); + if ((ch >= '0') && (ch <= '9')) + return (ch - '0'); + if ((ch >= 'A') && (ch <= 'F')) + return (ch - 'A' + 10); + return -1; +} + +/* Convert the memory, pointed to by mem into hexadecimal representation. + Put the result in buf, and return a pointer to the last character + in buf (null). */ + +static char * +mem2hex(char *buf, unsigned char *mem, int count) +{ + int i; + int ch; + + if (mem == NULL) { + /* Invalid address, caught by 'm' packet handler. */ + for (i = 0; i < count; i++) { + *buf++ = '0'; + *buf++ = '0'; + } + } else { + /* Valid mem address. */ + for (i = 0; i < count; i++) { + ch = *mem++; + buf = hex_byte_pack(buf, ch); + } + } + /* Terminate properly. */ + *buf = '\0'; + return buf; +} + +/* Same as mem2hex, but puts it in network byte order. */ +static char * +mem2hex_nbo(char *buf, unsigned char *mem, int count) +{ + int i; + int ch; + + mem += count - 1; + for (i = 0; i < count; i++) { + ch = *mem--; + buf = hex_byte_pack(buf, ch); + } + + /* Terminate properly. */ + *buf = '\0'; + return buf; +} + +/* Convert the array, in hexadecimal representation, pointed to by buf into + binary representation. Put the result in mem, and return a pointer to + the character after the last byte written. */ +static unsigned char* +hex2mem(unsigned char *mem, char *buf, int count) +{ + int i; + unsigned char ch; + for (i = 0; i < count; i++) { + ch = hex (*buf++) << 4; + ch = ch + hex (*buf++); + *mem++ = ch; + } + return mem; +} + +/* Put the content of the array, in binary representation, pointed to by buf + into memory pointed to by mem, and return a pointer to the character after + the last byte written. + Gdb will escape $, #, and the escape char (0x7d). */ +static unsigned char* +bin2mem(unsigned char *mem, unsigned char *buf, int count) +{ + int i; + unsigned char *next; + for (i = 0; i < count; i++) { + /* Check for any escaped characters. Be paranoid and + only unescape chars that should be escaped. */ + if (*buf == 0x7d) { + next = buf + 1; + if (*next == 0x3 || *next == 0x4 || *next == 0x5D) { + /* #, $, ESC */ + buf++; + *buf += 0x20; + } + } + *mem++ = *buf++; + } + return mem; +} + +/* Await the sequence $<data>#<checksum> and store <data> in the array buffer + returned. */ +static void +getpacket(char *buffer) +{ + unsigned char checksum; + unsigned char xmitcsum; + int i; + int count; + char ch; + + do { + while((ch = getDebugChar ()) != '$') + /* Wait for the start character $ and ignore all other characters */; + checksum = 0; + xmitcsum = -1; + count = 0; + /* Read until a # or the end of the buffer is reached */ + while (count < BUFMAX) { + ch = getDebugChar(); + if (ch == '#') + break; + checksum = checksum + ch; + buffer[count] = ch; + count = count + 1; + } + + if (count >= BUFMAX) + continue; + + buffer[count] = 0; + + if (ch == '#') { + xmitcsum = hex(getDebugChar()) << 4; + xmitcsum += hex(getDebugChar()); + if (checksum != xmitcsum) { + /* Wrong checksum */ + putDebugChar('-'); + } else { + /* Correct checksum */ + putDebugChar('+'); + /* If sequence characters are received, reply with them */ + if (buffer[2] == ':') { + putDebugChar(buffer[0]); + putDebugChar(buffer[1]); + /* Remove the sequence characters from the buffer */ + count = gdb_cris_strlen(buffer); + for (i = 3; i <= count; i++) + buffer[i - 3] = buffer[i]; + } + } + } + } while (checksum != xmitcsum); +} + +/* Send $<data>#<checksum> from the <data> in the array buffer. */ + +static void +putpacket(char *buffer) +{ + int checksum; + int runlen; + int encode; + + do { + char *src = buffer; + putDebugChar('$'); + checksum = 0; + while (*src) { + /* Do run length encoding */ + putDebugChar(*src); + checksum += *src; + runlen = 0; + while (runlen < RUNLENMAX && *src == src[runlen]) { + runlen++; + } + if (runlen > 3) { + /* Got a useful amount */ + putDebugChar ('*'); + checksum += '*'; + encode = runlen + ' ' - 4; + putDebugChar(encode); + checksum += encode; + src += runlen; + } else { + src++; + } + } + putDebugChar('#'); + putDebugChar(hex_asc_hi(checksum)); + putDebugChar(hex_asc_lo(checksum)); + } while(kgdb_started && (getDebugChar() != '+')); +} + +/* The string str is prepended with the GDB printout token and sent. Required + in traditional implementations. */ +void +putDebugString(const unsigned char *str, int len) +{ + /* Move SPC forward if we are single-stepping. */ + asm("spchere:"); + asm("move $spc, $r10"); + asm("cmp.d spchere, $r10"); + asm("bne nosstep"); + asm("nop"); + asm("move.d spccont, $r10"); + asm("move $r10, $spc"); + asm("nosstep:"); + + output_buffer[0] = 'O'; + mem2hex(&output_buffer[1], (unsigned char *)str, len); + putpacket(output_buffer); + + asm("spccont:"); +} + +/********************************** Handle exceptions ************************/ +/* Build and send a response packet in order to inform the host the + stub is stopped. TAAn...:r...;n...:r...;n...:r...; + AA = signal number + n... = register number (hex) + r... = register contents + n... = `thread' + r... = thread process ID. This is a hex integer. + n... = other string not starting with valid hex digit. + gdb should ignore this n,r pair and go on to the next. + This way we can extend the protocol. */ +static void +stub_is_stopped(int sigval) +{ + char *ptr = output_buffer; + unsigned int reg_cont; + + /* Send trap type (converted to signal) */ + + *ptr++ = 'T'; + ptr = hex_byte_pack(ptr, sigval); + + if (((reg.exs & 0xff00) >> 8) == 0xc) { + + /* Some kind of hardware watchpoint triggered. Find which one + and determine its type (read/write/access). */ + int S, bp, trig_bits = 0, rw_bits = 0; + int trig_mask = 0; + unsigned int *bp_d_regs = &sreg.s3_3; + /* In a lot of cases, the stopped data address will simply be EDA. + In some cases, we adjust it to match the watched data range. + (We don't want to change the actual EDA though). */ + unsigned int stopped_data_address; + /* The S field of EXS. */ + S = (reg.exs & 0xffff0000) >> 16; + + if (S & 1) { + /* Instruction watchpoint. */ + /* FIXME: Check against, and possibly adjust reported EDA. */ + } else { + /* Data watchpoint. Find the one that triggered. */ + for (bp = 0; bp < 6; bp++) { + + /* Dx_RD, Dx_WR in the S field of EXS for this BP. */ + int bitpos_trig = 1 + bp * 2; + /* Dx_BPRD, Dx_BPWR in BP_CTRL for this BP. */ + int bitpos_config = 2 + bp * 4; + + /* Get read/write trig bits for this BP. */ + trig_bits = (S & (3 << bitpos_trig)) >> bitpos_trig; + + /* Read/write config bits for this BP. */ + rw_bits = (sreg.s0_3 & (3 << bitpos_config)) >> bitpos_config; + if (trig_bits) { + /* Sanity check: the BP shouldn't trigger for accesses + that it isn't configured for. */ + if ((rw_bits == 0x1 && trig_bits != 0x1) || + (rw_bits == 0x2 && trig_bits != 0x2)) + panic("Invalid r/w trigging for this BP"); + + /* Mark this BP as trigged for future reference. */ + trig_mask |= (1 << bp); + + if (reg.eda >= bp_d_regs[bp * 2] && + reg.eda <= bp_d_regs[bp * 2 + 1]) { + /* EDA within range for this BP; it must be the one + we're looking for. */ + stopped_data_address = reg.eda; + break; + } + } + } + if (bp < 6) { + /* Found a trigged BP with EDA within its configured data range. */ + } else if (trig_mask) { + /* Something triggered, but EDA doesn't match any BP's range. */ + for (bp = 0; bp < 6; bp++) { + /* Dx_BPRD, Dx_BPWR in BP_CTRL for this BP. */ + int bitpos_config = 2 + bp * 4; + + /* Read/write config bits for this BP (needed later). */ + rw_bits = (sreg.s0_3 & (3 << bitpos_config)) >> bitpos_config; + + if (trig_mask & (1 << bp)) { + /* EDA within 31 bytes of the configured start address? */ + if (reg.eda + 31 >= bp_d_regs[bp * 2]) { + /* Changing the reported address to match + the start address of the first applicable BP. */ + stopped_data_address = bp_d_regs[bp * 2]; + break; + } else { + /* We continue since we might find another useful BP. */ + printk("EDA doesn't match trigged BP's range"); + } + } + } + } + + /* No match yet? */ + BUG_ON(bp >= 6); + /* Note that we report the type according to what the BP is configured + for (otherwise we'd never report an 'awatch'), not according to how + it trigged. We did check that the trigged bits match what the BP is + configured for though. */ + if (rw_bits == 0x1) { + /* read */ + strncpy(ptr, "rwatch", 6); + ptr += 6; + } else if (rw_bits == 0x2) { + /* write */ + strncpy(ptr, "watch", 5); + ptr += 5; + } else if (rw_bits == 0x3) { + /* access */ + strncpy(ptr, "awatch", 6); + ptr += 6; + } else { + panic("Invalid r/w bits for this BP."); + } + + *ptr++ = ':'; + /* Note that we don't read_register(EDA, ...) */ + ptr = mem2hex_nbo(ptr, (unsigned char *)&stopped_data_address, register_size[EDA]); + *ptr++ = ';'; + } + } + /* Only send PC, frame and stack pointer. */ + read_register(PC, ®_cont); + ptr = hex_byte_pack(ptr, PC); + *ptr++ = ':'; + ptr = mem2hex(ptr, (unsigned char *)®_cont, register_size[PC]); + *ptr++ = ';'; + + read_register(R8, ®_cont); + ptr = hex_byte_pack(ptr, R8); + *ptr++ = ':'; + ptr = mem2hex(ptr, (unsigned char *)®_cont, register_size[R8]); + *ptr++ = ';'; + + read_register(SP, ®_cont); + ptr = hex_byte_pack(ptr, SP); + *ptr++ = ':'; + ptr = mem2hex(ptr, (unsigned char *)®_cont, register_size[SP]); + *ptr++ = ';'; + + /* Send ERP as well; this will save us an entire register fetch in some cases. */ + read_register(ERP, ®_cont); + ptr = hex_byte_pack(ptr, ERP); + *ptr++ = ':'; + ptr = mem2hex(ptr, (unsigned char *)®_cont, register_size[ERP]); + *ptr++ = ';'; + + /* null-terminate and send it off */ + *ptr = 0; + putpacket(output_buffer); +} + +/* Returns the size of an instruction that has a delay slot. */ + +int insn_size(unsigned long pc) +{ + unsigned short opcode = *(unsigned short *)pc; + int size = 0; + + switch ((opcode & 0x0f00) >> 8) { + case 0x0: + case 0x9: + case 0xb: + size = 2; + break; + case 0xe: + case 0xf: + size = 6; + break; + case 0xd: + /* Could be 4 or 6; check more bits. */ + if ((opcode & 0xff) == 0xff) + size = 4; + else + size = 6; + break; + default: + panic("Couldn't find size of opcode 0x%x at 0x%lx\n", opcode, pc); + } + + return size; +} + +void register_fixup(int sigval) +{ + /* Compensate for ACR push at the beginning of exception handler. */ + reg.sp += 4; + + /* Standard case. */ + reg.pc = reg.erp; + if (reg.erp & 0x1) { + /* Delay slot bit set. Report as stopped on proper instruction. */ + if (reg.spc) { + /* Rely on SPC if set. */ + reg.pc = reg.spc; + } else { + /* Calculate the PC from the size of the instruction + that the delay slot we're in belongs to. */ + reg.pc += insn_size(reg.erp & ~1) - 1 ; + } + } + + if ((reg.exs & 0x3) == 0x0) { + /* Bits 1 - 0 indicate the type of memory operation performed + by the interrupted instruction. 0 means no memory operation, + and EDA is undefined in that case. We zero it to avoid confusion. */ + reg.eda = 0; + } + + if (sigval == SIGTRAP) { + /* Break 8, single step or hardware breakpoint exception. */ + + /* Check IDX field of EXS. */ + if (((reg.exs & 0xff00) >> 8) == 0x18) { + + /* Break 8. */ + + /* Static (compiled) breakpoints must return to the next instruction + in order to avoid infinite loops (default value of ERP). Dynamic + (gdb-invoked) must subtract the size of the break instruction from + the ERP so that the instruction that was originally in the break + instruction's place will be run when we return from the exception. */ + if (!dynamic_bp) { + /* Assuming that all breakpoints are dynamic from now on. */ + dynamic_bp = 1; + } else { + + /* Only if not in a delay slot. */ + if (!(reg.erp & 0x1)) { + reg.erp -= 2; + reg.pc -= 2; + } + } + + } else if (((reg.exs & 0xff00) >> 8) == 0x3) { + /* Single step. */ + /* Don't fiddle with S1. */ + + } else if (((reg.exs & 0xff00) >> 8) == 0xc) { + + /* Hardware watchpoint exception. */ + + /* SPC has been updated so that we will get a single step exception + when we return, but we don't want that. */ + reg.spc = 0; + + /* Don't fiddle with S1. */ + } + + } else if (sigval == SIGINT) { + /* Nothing special. */ + } +} + +static void insert_watchpoint(char type, int addr, int len) +{ + /* Breakpoint/watchpoint types (GDB terminology): + 0 = memory breakpoint for instructions + (not supported; done via memory write instead) + 1 = hardware breakpoint for instructions (supported) + 2 = write watchpoint (supported) + 3 = read watchpoint (supported) + 4 = access watchpoint (supported) */ + + if (type < '1' || type > '4') { + output_buffer[0] = 0; + return; + } + + /* Read watchpoints are set as access watchpoints, because of GDB's + inability to deal with pure read watchpoints. */ + if (type == '3') + type = '4'; + + if (type == '1') { + /* Hardware (instruction) breakpoint. */ + /* Bit 0 in BP_CTRL holds the configuration for I0. */ + if (sreg.s0_3 & 0x1) { + /* Already in use. */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + return; + } + /* Configure. */ + sreg.s1_3 = addr; + sreg.s2_3 = (addr + len - 1); + sreg.s0_3 |= 1; + } else { + int bp; + unsigned int *bp_d_regs = &sreg.s3_3; + + /* The watchpoint allocation scheme is the simplest possible. + For example, if a region is watched for read and + a write watch is requested, a new watchpoint will + be used. Also, if a watch for a region that is already + covered by one or more existing watchpoints, a new + watchpoint will be used. */ + + /* First, find a free data watchpoint. */ + for (bp = 0; bp < 6; bp++) { + /* Each data watchpoint's control registers occupy 2 bits + (hence the 3), starting at bit 2 for D0 (hence the 2) + with 4 bits between for each watchpoint (yes, the 4). */ + if (!(sreg.s0_3 & (0x3 << (2 + (bp * 4))))) { + break; + } + } + + if (bp > 5) { + /* We're out of watchpoints. */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + return; + } + + /* Configure the control register first. */ + if (type == '3' || type == '4') { + /* Trigger on read. */ + sreg.s0_3 |= (1 << (2 + bp * 4)); + } + if (type == '2' || type == '4') { + /* Trigger on write. */ + sreg.s0_3 |= (2 << (2 + bp * 4)); + } + + /* Ugly pointer arithmetics to configure the watched range. */ + bp_d_regs[bp * 2] = addr; + bp_d_regs[bp * 2 + 1] = (addr + len - 1); + } + + /* Set the S1 flag to enable watchpoints. */ + reg.ccs |= (1 << (S_CCS_BITNR + CCS_SHIFT)); + gdb_cris_strcpy(output_buffer, "OK"); +} + +static void remove_watchpoint(char type, int addr, int len) +{ + /* Breakpoint/watchpoint types: + 0 = memory breakpoint for instructions + (not supported; done via memory write instead) + 1 = hardware breakpoint for instructions (supported) + 2 = write watchpoint (supported) + 3 = read watchpoint (supported) + 4 = access watchpoint (supported) */ + if (type < '1' || type > '4') { + output_buffer[0] = 0; + return; + } + + /* Read watchpoints are set as access watchpoints, because of GDB's + inability to deal with pure read watchpoints. */ + if (type == '3') + type = '4'; + + if (type == '1') { + /* Hardware breakpoint. */ + /* Bit 0 in BP_CTRL holds the configuration for I0. */ + if (!(sreg.s0_3 & 0x1)) { + /* Not in use. */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + return; + } + /* Deconfigure. */ + sreg.s1_3 = 0; + sreg.s2_3 = 0; + sreg.s0_3 &= ~1; + } else { + int bp; + unsigned int *bp_d_regs = &sreg.s3_3; + /* Try to find a watchpoint that is configured for the + specified range, then check that read/write also matches. */ + + /* Ugly pointer arithmetic, since I cannot rely on a + single switch (addr) as there may be several watchpoints with + the same start address for example. */ + + for (bp = 0; bp < 6; bp++) { + if (bp_d_regs[bp * 2] == addr && + bp_d_regs[bp * 2 + 1] == (addr + len - 1)) { + /* Matching range. */ + int bitpos = 2 + bp * 4; + int rw_bits; + + /* Read/write bits for this BP. */ + rw_bits = (sreg.s0_3 & (0x3 << bitpos)) >> bitpos; + + if ((type == '3' && rw_bits == 0x1) || + (type == '2' && rw_bits == 0x2) || + (type == '4' && rw_bits == 0x3)) { + /* Read/write matched. */ + break; + } + } + } + + if (bp > 5) { + /* No watchpoint matched. */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + return; + } + + /* Found a matching watchpoint. Now, deconfigure it by + both disabling read/write in bp_ctrl and zeroing its + start/end addresses. */ + sreg.s0_3 &= ~(3 << (2 + (bp * 4))); + bp_d_regs[bp * 2] = 0; + bp_d_regs[bp * 2 + 1] = 0; + } + + /* Note that we don't clear the S1 flag here. It's done when continuing. */ + gdb_cris_strcpy(output_buffer, "OK"); +} + + + +/* All expected commands are sent from remote.c. Send a response according + to the description in remote.c. */ +void +handle_exception(int sigval) +{ + /* Avoid warning of not used. */ + + USEDFUN(handle_exception); + USEDVAR(internal_stack[0]); + + register_fixup(sigval); + + /* Send response. */ + stub_is_stopped(sigval); + + for (;;) { + output_buffer[0] = '\0'; + getpacket(input_buffer); + switch (input_buffer[0]) { + case 'g': + /* Read registers: g + Success: Each byte of register data is described by two hex digits. + Registers are in the internal order for GDB, and the bytes + in a register are in the same order the machine uses. + Failure: void. */ + { + char *buf; + /* General and special registers. */ + buf = mem2hex(output_buffer, (char *)®, sizeof(registers)); + /* Support registers. */ + /* -1 because of the null termination that mem2hex adds. */ + mem2hex(buf, + (char *)&sreg + (reg.srs * 16 * sizeof(unsigned int)), + 16 * sizeof(unsigned int)); + break; + } + case 'G': + /* Write registers. GXX..XX + Each byte of register data is described by two hex digits. + Success: OK + Failure: void. */ + /* General and special registers. */ + hex2mem((char *)®, &input_buffer[1], sizeof(registers)); + /* Support registers. */ + hex2mem((char *)&sreg + (reg.srs * 16 * sizeof(unsigned int)), + &input_buffer[1] + sizeof(registers), + 16 * sizeof(unsigned int)); + gdb_cris_strcpy(output_buffer, "OK"); + break; + + case 'P': + /* Write register. Pn...=r... + Write register n..., hex value without 0x, with value r..., + which contains a hex value without 0x and two hex digits + for each byte in the register (target byte order). P1f=11223344 means + set register 31 to 44332211. + Success: OK + Failure: E02, E05 */ + { + char *suffix; + int regno = gdb_cris_strtol(&input_buffer[1], &suffix, 16); + int status; + + status = write_register(regno, suffix+1); + + switch (status) { + case E02: + /* Do not support read-only registers. */ + gdb_cris_strcpy(output_buffer, error_message[E02]); + break; + case E05: + /* Do not support non-existing registers. */ + gdb_cris_strcpy(output_buffer, error_message[E05]); + break; + default: + /* Valid register number. */ + gdb_cris_strcpy(output_buffer, "OK"); + break; + } + } + break; + + case 'm': + /* Read from memory. mAA..AA,LLLL + AA..AA is the address and LLLL is the length. + Success: XX..XX is the memory content. Can be fewer bytes than + requested if only part of the data may be read. m6000120a,6c means + retrieve 108 byte from base address 6000120a. + Failure: void. */ + { + char *suffix; + unsigned char *addr = (unsigned char *)gdb_cris_strtol(&input_buffer[1], + &suffix, 16); + int len = gdb_cris_strtol(suffix+1, 0, 16); + + /* Bogus read (i.e. outside the kernel's + segment)? . */ + if (!((unsigned int)addr >= 0xc0000000 && + (unsigned int)addr < 0xd0000000)) + addr = NULL; + + mem2hex(output_buffer, addr, len); + } + break; + + case 'X': + /* Write to memory. XAA..AA,LLLL:XX..XX + AA..AA is the start address, LLLL is the number of bytes, and + XX..XX is the binary data. + Success: OK + Failure: void. */ + case 'M': + /* Write to memory. MAA..AA,LLLL:XX..XX + AA..AA is the start address, LLLL is the number of bytes, and + XX..XX is the hexadecimal data. + Success: OK + Failure: void. */ + { + char *lenptr; + char *dataptr; + unsigned char *addr = (unsigned char *)gdb_cris_strtol(&input_buffer[1], + &lenptr, 16); + int len = gdb_cris_strtol(lenptr+1, &dataptr, 16); + if (*lenptr == ',' && *dataptr == ':') { + if (input_buffer[0] == 'M') { + hex2mem(addr, dataptr + 1, len); + } else /* X */ { + bin2mem(addr, dataptr + 1, len); + } + gdb_cris_strcpy(output_buffer, "OK"); + } + else { + gdb_cris_strcpy(output_buffer, error_message[E06]); + } + } + break; + + case 'c': + /* Continue execution. cAA..AA + AA..AA is the address where execution is resumed. If AA..AA is + omitted, resume at the present address. + Success: return to the executing thread. + Failure: will never know. */ + + if (input_buffer[1] != '\0') { + /* FIXME: Doesn't handle address argument. */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + break; + } + + /* Before continuing, make sure everything is set up correctly. */ + + /* Set the SPC to some unlikely value. */ + reg.spc = 0; + /* Set the S1 flag to 0 unless some watchpoint is enabled (since setting + S1 to 0 would also disable watchpoints). (Note that bits 26-31 in BP_CTRL + are reserved, so don't check against those). */ + if ((sreg.s0_3 & 0x3fff) == 0) { + reg.ccs &= ~(1 << (S_CCS_BITNR + CCS_SHIFT)); + } + + return; + + case 's': + /* Step. sAA..AA + AA..AA is the address where execution is resumed. If AA..AA is + omitted, resume at the present address. Success: return to the + executing thread. Failure: will never know. */ + + if (input_buffer[1] != '\0') { + /* FIXME: Doesn't handle address argument. */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + break; + } + + /* Set the SPC to PC, which is where we'll return + (deduced previously). */ + reg.spc = reg.pc; + + /* Set the S1 (first stacked, not current) flag, which will + kick into action when we rfe. */ + reg.ccs |= (1 << (S_CCS_BITNR + CCS_SHIFT)); + return; + + case 'Z': + + /* Insert breakpoint or watchpoint, Ztype,addr,length. + Remote protocol says: A remote target shall return an empty string + for an unrecognized breakpoint or watchpoint packet type. */ + { + char *lenptr; + char *dataptr; + int addr = gdb_cris_strtol(&input_buffer[3], &lenptr, 16); + int len = gdb_cris_strtol(lenptr + 1, &dataptr, 16); + char type = input_buffer[1]; + + insert_watchpoint(type, addr, len); + break; + } + + case 'z': + /* Remove breakpoint or watchpoint, Ztype,addr,length. + Remote protocol says: A remote target shall return an empty string + for an unrecognized breakpoint or watchpoint packet type. */ + { + char *lenptr; + char *dataptr; + int addr = gdb_cris_strtol(&input_buffer[3], &lenptr, 16); + int len = gdb_cris_strtol(lenptr + 1, &dataptr, 16); + char type = input_buffer[1]; + + remove_watchpoint(type, addr, len); + break; + } + + + case '?': + /* The last signal which caused a stop. ? + Success: SAA, where AA is the signal number. + Failure: void. */ + output_buffer[0] = 'S'; + output_buffer[1] = hex_asc_hi(sigval); + output_buffer[2] = hex_asc_lo(sigval); + output_buffer[3] = 0; + break; + + case 'D': + /* Detach from host. D + Success: OK, and return to the executing thread. + Failure: will never know */ + putpacket("OK"); + return; + + case 'k': + case 'r': + /* kill request or reset request. + Success: restart of target. + Failure: will never know. */ + kill_restart(); + break; + + case 'C': + case 'S': + case '!': + case 'R': + case 'd': + /* Continue with signal sig. Csig;AA..AA + Step with signal sig. Ssig;AA..AA + Use the extended remote protocol. ! + Restart the target system. R0 + Toggle debug flag. d + Search backwards. tAA:PP,MM + Not supported: E04 */ + + /* FIXME: What's the difference between not supported + and ignored (below)? */ + gdb_cris_strcpy(output_buffer, error_message[E04]); + break; + + default: + /* The stub should ignore other request and send an empty + response ($#<checksum>). This way we can extend the protocol and GDB + can tell whether the stub it is talking to uses the old or the new. */ + output_buffer[0] = 0; + break; + } + putpacket(output_buffer); + } +} + +void +kgdb_init(void) +{ + reg_intr_vect_rw_mask intr_mask; + reg_ser_rw_intr_mask ser_intr_mask; + + /* Configure the kgdb serial port. */ +#if defined(CONFIG_ETRAX_KGDB_PORT0) + /* Note: no shortcut registered (not handled by multiple_interrupt). + See entry.S. */ + set_exception_vector(SER0_INTR_VECT, kgdb_handle_exception); + /* Enable the ser irq in the global config. */ + intr_mask = REG_RD(intr_vect, regi_irq, rw_mask); + intr_mask.ser0 = 1; + REG_WR(intr_vect, regi_irq, rw_mask, intr_mask); + + ser_intr_mask = REG_RD(ser, regi_ser0, rw_intr_mask); + ser_intr_mask.dav = regk_ser_yes; + REG_WR(ser, regi_ser0, rw_intr_mask, ser_intr_mask); +#elif defined(CONFIG_ETRAX_KGDB_PORT1) + /* Note: no shortcut registered (not handled by multiple_interrupt). + See entry.S. */ + set_exception_vector(SER1_INTR_VECT, kgdb_handle_exception); + /* Enable the ser irq in the global config. */ + intr_mask = REG_RD(intr_vect, regi_irq, rw_mask); + intr_mask.ser1 = 1; + REG_WR(intr_vect, regi_irq, rw_mask, intr_mask); + + ser_intr_mask = REG_RD(ser, regi_ser1, rw_intr_mask); + ser_intr_mask.dav = regk_ser_yes; + REG_WR(ser, regi_ser1, rw_intr_mask, ser_intr_mask); +#elif defined(CONFIG_ETRAX_KGDB_PORT2) + /* Note: no shortcut registered (not handled by multiple_interrupt). + See entry.S. */ + set_exception_vector(SER2_INTR_VECT, kgdb_handle_exception); + /* Enable the ser irq in the global config. */ + intr_mask = REG_RD(intr_vect, regi_irq, rw_mask); + intr_mask.ser2 = 1; + REG_WR(intr_vect, regi_irq, rw_mask, intr_mask); + + ser_intr_mask = REG_RD(ser, regi_ser2, rw_intr_mask); + ser_intr_mask.dav = regk_ser_yes; + REG_WR(ser, regi_ser2, rw_intr_mask, ser_intr_mask); +#elif defined(CONFIG_ETRAX_KGDB_PORT3) + /* Note: no shortcut registered (not handled by multiple_interrupt). + See entry.S. */ + set_exception_vector(SER3_INTR_VECT, kgdb_handle_exception); + /* Enable the ser irq in the global config. */ + intr_mask = REG_RD(intr_vect, regi_irq, rw_mask); + intr_mask.ser3 = 1; + REG_WR(intr_vect, regi_irq, rw_mask, intr_mask); + + ser_intr_mask = REG_RD(ser, regi_ser3, rw_intr_mask); + ser_intr_mask.dav = regk_ser_yes; + REG_WR(ser, regi_ser3, rw_intr_mask, ser_intr_mask); +#endif + +} +/* Performs a complete re-start from scratch. */ +static void +kill_restart(void) +{ + machine_restart(""); +} + +/* Use this static breakpoint in the start-up only. */ + +void +breakpoint(void) +{ + kgdb_started = 1; + dynamic_bp = 0; /* This is a static, not a dynamic breakpoint. */ + __asm__ volatile ("break 8"); /* Jump to kgdb_handle_breakpoint. */ +} + +/****************************** End of file **********************************/ diff --git a/arch/cris/arch-v32/kernel/kgdb_asm.S b/arch/cris/arch-v32/kernel/kgdb_asm.S new file mode 100644 index 000000000..f3a476059 --- /dev/null +++ b/arch/cris/arch-v32/kernel/kgdb_asm.S @@ -0,0 +1,551 @@ +/* + * Copyright (C) 2004 Axis Communications AB + * + * Code for handling break 8, hardware breakpoint, single step, and serial + * port exceptions for kernel debugging purposes. + */ + +#include <hwregs/intr_vect.h> + + ;; Exported functions. + .globl kgdb_handle_exception + +kgdb_handle_exception: + +;; Create a register image of the caller. +;; +;; First of all, save the ACR on the stack since we need it for address calculations. +;; We put it into the register struct later. + + subq 4, $sp + move.d $acr, [$sp] + +;; Now we are free to use ACR all we want. +;; If we were running this handler with interrupts on, we would have to be careful +;; to save and restore CCS manually, but since we aren't we treat it like every other +;; register. + + move.d reg, $acr + move.d $r0, [$acr] ; Save R0 (start of register struct) + addq 4, $acr + move.d $r1, [$acr] ; Save R1 + addq 4, $acr + move.d $r2, [$acr] ; Save R2 + addq 4, $acr + move.d $r3, [$acr] ; Save R3 + addq 4, $acr + move.d $r4, [$acr] ; Save R4 + addq 4, $acr + move.d $r5, [$acr] ; Save R5 + addq 4, $acr + move.d $r6, [$acr] ; Save R6 + addq 4, $acr + move.d $r7, [$acr] ; Save R7 + addq 4, $acr + move.d $r8, [$acr] ; Save R8 + addq 4, $acr + move.d $r9, [$acr] ; Save R9 + addq 4, $acr + move.d $r10, [$acr] ; Save R10 + addq 4, $acr + move.d $r11, [$acr] ; Save R11 + addq 4, $acr + move.d $r12, [$acr] ; Save R12 + addq 4, $acr + move.d $r13, [$acr] ; Save R13 + addq 4, $acr + move.d $sp, [$acr] ; Save SP (R14) + addq 4, $acr + + ;; The ACR register is already saved on the stack, so pop it from there. + move.d [$sp],$r0 + move.d $r0, [$acr] + addq 4, $acr + + move $bz, [$acr] + addq 1, $acr + move $vr, [$acr] + addq 1, $acr + move $pid, [$acr] + addq 4, $acr + move $srs, [$acr] + addq 1, $acr + move $wz, [$acr] + addq 2, $acr + move $exs, [$acr] + addq 4, $acr + move $eda, [$acr] + addq 4, $acr + move $mof, [$acr] + addq 4, $acr + move $dz, [$acr] + addq 4, $acr + move $ebp, [$acr] + addq 4, $acr + move $erp, [$acr] + addq 4, $acr + move $srp, [$acr] + addq 4, $acr + move $nrp, [$acr] + addq 4, $acr + move $ccs, [$acr] + addq 4, $acr + move $usp, [$acr] + addq 4, $acr + move $spc, [$acr] + addq 4, $acr + +;; Skip the pseudo-PC. + addq 4, $acr + +;; Save the support registers in bank 0 - 3. + clear.d $r1 ; Bank counter + move.d sreg, $acr + +;; Bank 0 + move $r1, $srs + nop + nop + nop + move $s0, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s1, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s2, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s3, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s4, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s5, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s6, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s7, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s8, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s9, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s10, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s11, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s12, $r0 + move.d $r0, [$acr] + addq 4, $acr + + ;; Nothing in S13 - S15, bank 0 + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + +;; Bank 1 and bank 2 have the same layout, hence the loop. + addq 1, $r1 +1: + move $r1, $srs + nop + nop + nop + move $s0, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s1, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s2, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s3, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s4, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s5, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s6, $r0 + move.d $r0, [$acr] + addq 4, $acr + + ;; Nothing in S7 - S15, bank 1 and 2 + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + clear.d [$acr] + addq 4, $acr + + addq 1, $r1 + cmpq 3, $r1 + bne 1b + nop + +;; Bank 3 + move $r1, $srs + nop + nop + nop + move $s0, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s1, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s2, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s3, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s4, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s5, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s6, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s7, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s8, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s9, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s10, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s11, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s12, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s13, $r0 + move.d $r0, [$acr] + addq 4, $acr + move $s14, $r0 + move.d $r0, [$acr] + addq 4, $acr +;; Nothing in S15, bank 3 + clear.d [$acr] + addq 4, $acr + +;; Check what got us here: get IDX field of EXS. + move $exs, $r10 + and.d 0xff00, $r10 + lsrq 8, $r10 +#if defined(CONFIG_ETRAX_KGDB_PORT0) + cmp.d SER0_INTR_VECT, $r10 ; IRQ for serial port 0 + beq sigint + nop +#elif defined(CONFIG_ETRAX_KGDB_PORT1) + cmp.d SER1_INTR_VECT, $r10 ; IRQ for serial port 1 + beq sigint + nop +#elif defined(CONFIG_ETRAX_KGDB_PORT2) + cmp.d SER2_INTR_VECT, $r10 ; IRQ for serial port 2 + beq sigint + nop +#elif defined(CONFIG_ETRAX_KGDB_PORT3) + cmp.d SER3_INTR_VECT, $r10 ; IRQ for serial port 3 + beq sigint + nop +#endif +;; Multiple interrupt must be due to serial break. + cmp.d 0x30, $r10 ; Multiple interrupt + beq sigint + nop +;; Neither of those? Then it's a sigtrap. + ba handle_comm + moveq 5, $r10 ; Set SIGTRAP (delay slot) + +sigint: + ;; Serial interrupt; get character + jsr getDebugChar + nop ; Delay slot + cmp.b 3, $r10 ; \003 (Ctrl-C)? + bne return ; No, get out of here + nop + moveq 2, $r10 ; Set SIGINT + +;; +;; Handle the communication +;; +handle_comm: + move.d internal_stack+1020, $sp ; Use the internal stack which grows upwards + jsr handle_exception ; Interactive routine + nop + +;; +;; Return to the caller +;; +return: + +;; First of all, write the support registers. + clear.d $r1 ; Bank counter + move.d sreg, $acr + +;; Bank 0 + move $r1, $srs + nop + nop + nop + move.d [$acr], $r0 + move $r0, $s0 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s1 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s2 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s3 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s4 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s5 + addq 4, $acr + +;; Nothing in S6 - S7, bank 0. + addq 4, $acr + addq 4, $acr + + move.d [$acr], $r0 + move $r0, $s8 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s9 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s10 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s11 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s12 + addq 4, $acr + +;; Nothing in S13 - S15, bank 0 + addq 4, $acr + addq 4, $acr + addq 4, $acr + +;; Bank 1 and bank 2 have the same layout, hence the loop. + addq 1, $r1 +2: + move $r1, $srs + nop + nop + nop + move.d [$acr], $r0 + move $r0, $s0 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s1 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s2 + addq 4, $acr + +;; S3 (MM_CAUSE) is read-only. + addq 4, $acr + + move.d [$acr], $r0 + move $r0, $s4 + addq 4, $acr + +;; FIXME: Actually write S5/S6? (Affects MM_CAUSE.) + addq 4, $acr + addq 4, $acr + +;; Nothing in S7 - S15, bank 1 and 2 + addq 4, $acr + addq 4, $acr + addq 4, $acr + addq 4, $acr + addq 4, $acr + addq 4, $acr + addq 4, $acr + addq 4, $acr + addq 4, $acr + + addq 1, $r1 + cmpq 3, $r1 + bne 2b + nop + +;; Bank 3 + move $r1, $srs + nop + nop + nop + move.d [$acr], $r0 + move $r0, $s0 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s1 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s2 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s3 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s4 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s5 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s6 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s7 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s8 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s9 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s10 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s11 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s12 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s13 + addq 4, $acr + move.d [$acr], $r0 + move $r0, $s14 + addq 4, $acr + +;; Nothing in S15, bank 3 + addq 4, $acr + +;; Now, move on to the regular register restoration process. + + move.d reg, $acr ; Reset ACR to point at the beginning of the register image + move.d [$acr], $r0 ; Restore R0 + addq 4, $acr + move.d [$acr], $r1 ; Restore R1 + addq 4, $acr + move.d [$acr], $r2 ; Restore R2 + addq 4, $acr + move.d [$acr], $r3 ; Restore R3 + addq 4, $acr + move.d [$acr], $r4 ; Restore R4 + addq 4, $acr + move.d [$acr], $r5 ; Restore R5 + addq 4, $acr + move.d [$acr], $r6 ; Restore R6 + addq 4, $acr + move.d [$acr], $r7 ; Restore R7 + addq 4, $acr + move.d [$acr], $r8 ; Restore R8 + addq 4, $acr + move.d [$acr], $r9 ; Restore R9 + addq 4, $acr + move.d [$acr], $r10 ; Restore R10 + addq 4, $acr + move.d [$acr], $r11 ; Restore R11 + addq 4, $acr + move.d [$acr], $r12 ; Restore R12 + addq 4, $acr + move.d [$acr], $r13 ; Restore R13 + +;; +;; We restore all registers, even though some of them probably haven't changed. +;; + + addq 4, $acr + move.d [$acr], $sp ; Restore SP (R14) + + ;; ACR cannot be restored just yet. + addq 8, $acr + + ;; Skip BZ, VR. + addq 2, $acr + + move [$acr], $pid ; Restore PID + addq 4, $acr + move [$acr], $srs ; Restore SRS + nop + nop + nop + addq 1, $acr + + ;; Skip WZ. + addq 2, $acr + + move [$acr], $exs ; Restore EXS. + addq 4, $acr + move [$acr], $eda ; Restore EDA. + addq 4, $acr + move [$acr], $mof ; Restore MOF. + + ;; Skip DZ. + addq 8, $acr + + move [$acr], $ebp ; Restore EBP. + addq 4, $acr + move [$acr], $erp ; Restore ERP. + addq 4, $acr + move [$acr], $srp ; Restore SRP. + addq 4, $acr + move [$acr], $nrp ; Restore NRP. + addq 4, $acr + move [$acr], $ccs ; Restore CCS like an ordinary register. + addq 4, $acr + move [$acr], $usp ; Restore USP + addq 4, $acr + move [$acr], $spc ; Restore SPC + ; No restoration of pseudo-PC of course. + + move.d reg, $acr ; Reset ACR to point at the beginning of the register image + add.d 15*4, $acr + move.d [$acr], $acr ; Finally, restore ACR. + rete ; Same as jump ERP + rfe ; Shifts CCS diff --git a/arch/cris/arch-v32/kernel/process.c b/arch/cris/arch-v32/kernel/process.c new file mode 100644 index 000000000..cebd32e2a --- /dev/null +++ b/arch/cris/arch-v32/kernel/process.c @@ -0,0 +1,184 @@ +/* + * Copyright (C) 2000-2003 Axis Communications AB + * + * Authors: Bjorn Wesen (bjornw@axis.com) + * Mikael Starvik (starvik@axis.com) + * Tobias Anderberg (tobiasa@axis.com), CRISv32 port. + * + * This file handles the architecture-dependent parts of process handling.. + */ + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/fs.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/reg_map.h> +#include <hwregs/timer_defs.h> +#include <hwregs/intr_vect_defs.h> +#include <linux/ptrace.h> + +extern void stop_watchdog(void); + +/* We use this if we don't have any better idle routine. */ +void default_idle(void) +{ + /* Halt until exception. */ + __asm__ volatile("ei \n\t" + "halt "); +} + +/* + * Free current thread data structures etc.. + */ + +extern void deconfigure_bp(long pid); +void exit_thread(void) +{ + deconfigure_bp(current->pid); +} + +/* + * If the watchdog is enabled, disable interrupts and enter an infinite loop. + * The watchdog will reset the CPU after 0.1s. If the watchdog isn't enabled + * then enable it and wait. + */ +extern void arch_enable_nmi(void); + +void +hard_reset_now(void) +{ + /* + * Don't declare this variable elsewhere. We don't want any other + * code to know about it than the watchdog handler in entry.S and + * this code, implementing hard reset through the watchdog. + */ +#if defined(CONFIG_ETRAX_WATCHDOG) + extern int cause_of_death; +#endif + + printk("*** HARD RESET ***\n"); + local_irq_disable(); + +#if defined(CONFIG_ETRAX_WATCHDOG) + cause_of_death = 0xbedead; +#else +{ + reg_timer_rw_wd_ctrl wd_ctrl = {0}; + + stop_watchdog(); + + wd_ctrl.key = 16; /* Arbitrary key. */ + wd_ctrl.cnt = 1; /* Minimum time. */ + wd_ctrl.cmd = regk_timer_start; + + arch_enable_nmi(); + REG_WR(timer, regi_timer0, rw_wd_ctrl, wd_ctrl); +} +#endif + + while (1) + ; /* Wait for reset. */ +} + +/* + * Return saved PC of a blocked thread. + */ +unsigned long thread_saved_pc(struct task_struct *t) +{ + return task_pt_regs(t)->erp; +} + +/* + * Setup the child's kernel stack with a pt_regs and call switch_stack() on it. + * It will be unnested during _resume and _ret_from_sys_call when the new thread + * is scheduled. + * + * Also setup the thread switching structure which is used to keep + * thread-specific data during _resumes. + */ + +extern asmlinkage void ret_from_fork(void); +extern asmlinkage void ret_from_kernel_thread(void); + +int +copy_thread(unsigned long clone_flags, unsigned long usp, + unsigned long arg, struct task_struct *p) +{ + struct pt_regs *childregs = task_pt_regs(p); + struct switch_stack *swstack = ((struct switch_stack *) childregs) - 1; + + /* + * Put the pt_regs structure at the end of the new kernel stack page and + * fix it up. Note: the task_struct doubles as the kernel stack for the + * task. + */ + if (unlikely(p->flags & PF_KTHREAD)) { + memset(swstack, 0, + sizeof(struct switch_stack) + sizeof(struct pt_regs)); + swstack->r1 = usp; + swstack->r2 = arg; + childregs->ccs = 1 << (I_CCS_BITNR + CCS_SHIFT); + swstack->return_ip = (unsigned long) ret_from_kernel_thread; + p->thread.ksp = (unsigned long) swstack; + p->thread.usp = 0; + return 0; + } + *childregs = *current_pt_regs(); /* Struct copy of pt_regs. */ + childregs->r10 = 0; /* Child returns 0 after a fork/clone. */ + + /* Set a new TLS ? + * The TLS is in $mof because it is the 5th argument to sys_clone. + */ + if (p->mm && (clone_flags & CLONE_SETTLS)) { + task_thread_info(p)->tls = childregs->mof; + } + + /* Put the switch stack right below the pt_regs. */ + + /* Parameter to ret_from_sys_call. 0 is don't restart the syscall. */ + swstack->r9 = 0; + + /* + * We want to return into ret_from_sys_call after the _resume. + * ret_from_fork will call ret_from_sys_call. + */ + swstack->return_ip = (unsigned long) ret_from_fork; + + /* Fix the user-mode and kernel-mode stackpointer. */ + p->thread.usp = usp ?: rdusp(); + p->thread.ksp = (unsigned long) swstack; + + return 0; +} + +unsigned long +get_wchan(struct task_struct *p) +{ + /* TODO */ + return 0; +} +#undef last_sched +#undef first_sched + +void show_regs(struct pt_regs * regs) +{ + unsigned long usp = rdusp(); + + show_regs_print_info(KERN_DEFAULT); + + printk("ERP: %08lx SRP: %08lx CCS: %08lx USP: %08lx MOF: %08lx\n", + regs->erp, regs->srp, regs->ccs, usp, regs->mof); + + printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", + regs->r0, regs->r1, regs->r2, regs->r3); + + printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", + regs->r4, regs->r5, regs->r6, regs->r7); + + printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", + regs->r8, regs->r9, regs->r10, regs->r11); + + printk("r12: %08lx r13: %08lx oR10: %08lx\n", + regs->r12, regs->r13, regs->orig_r10); +} diff --git a/arch/cris/arch-v32/kernel/ptrace.c b/arch/cris/arch-v32/kernel/ptrace.c new file mode 100644 index 000000000..f085229cf --- /dev/null +++ b/arch/cris/arch-v32/kernel/ptrace.c @@ -0,0 +1,490 @@ +/* + * Copyright (C) 2000-2007, Axis Communications AB. + */ + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/errno.h> +#include <linux/ptrace.h> +#include <linux/user.h> +#include <linux/signal.h> +#include <linux/security.h> + +#include <asm/uaccess.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/processor.h> +#include <arch/hwregs/supp_reg.h> + +/* + * Determines which bits in CCS the user has access to. + * 1 = access, 0 = no access. + */ +#define CCS_MASK 0x00087c00 /* SXNZVC */ + +#define SBIT_USER (1 << (S_CCS_BITNR + CCS_SHIFT)) + +static int put_debugreg(long pid, unsigned int regno, long data); +static long get_debugreg(long pid, unsigned int regno); +static unsigned long get_pseudo_pc(struct task_struct *child); +void deconfigure_bp(long pid); + +extern unsigned long cris_signal_return_page; + +/* + * Get contents of register REGNO in task TASK. + */ +long get_reg(struct task_struct *task, unsigned int regno) +{ + /* USP is a special case, it's not in the pt_regs struct but + * in the tasks thread struct + */ + unsigned long ret; + + if (regno <= PT_EDA) + ret = ((unsigned long *)task_pt_regs(task))[regno]; + else if (regno == PT_USP) + ret = task->thread.usp; + else if (regno == PT_PPC) + ret = get_pseudo_pc(task); + else if (regno <= PT_MAX) + ret = get_debugreg(task->pid, regno); + else + ret = 0; + + return ret; +} + +/* + * Write contents of register REGNO in task TASK. + */ +int put_reg(struct task_struct *task, unsigned int regno, unsigned long data) +{ + if (regno <= PT_EDA) + ((unsigned long *)task_pt_regs(task))[regno] = data; + else if (regno == PT_USP) + task->thread.usp = data; + else if (regno == PT_PPC) { + /* Write pseudo-PC to ERP only if changed. */ + if (data != get_pseudo_pc(task)) + task_pt_regs(task)->erp = data; + } else if (regno <= PT_MAX) + return put_debugreg(task->pid, regno, data); + else + return -1; + return 0; +} + +void user_enable_single_step(struct task_struct *child) +{ + unsigned long tmp; + + /* + * Set up SPC if not set already (in which case we have no other + * choice but to trust it). + */ + if (!get_reg(child, PT_SPC)) { + /* In case we're stopped in a delay slot. */ + tmp = get_reg(child, PT_ERP) & ~1; + put_reg(child, PT_SPC, tmp); + } + tmp = get_reg(child, PT_CCS) | SBIT_USER; + put_reg(child, PT_CCS, tmp); +} + +void user_disable_single_step(struct task_struct *child) +{ + put_reg(child, PT_SPC, 0); + + if (!get_debugreg(child->pid, PT_BP_CTRL)) { + unsigned long tmp; + /* If no h/w bp configured, disable S bit. */ + tmp = get_reg(child, PT_CCS) & ~SBIT_USER; + put_reg(child, PT_CCS, tmp); + } +} + +/* + * Called by kernel/ptrace.c when detaching. + * + * Make sure the single step bit is not set. + */ +void +ptrace_disable(struct task_struct *child) +{ + /* Deconfigure SPC and S-bit. */ + user_disable_single_step(child); + put_reg(child, PT_SPC, 0); + + /* Deconfigure any watchpoints associated with the child. */ + deconfigure_bp(child->pid); +} + + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + int ret; + unsigned int regno = addr >> 2; + unsigned long __user *datap = (unsigned long __user *)data; + + switch (request) { + /* Read word at location address. */ + case PTRACE_PEEKTEXT: + case PTRACE_PEEKDATA: { + unsigned long tmp; + int copied; + + ret = -EIO; + + /* The signal trampoline page is outside the normal user-addressable + * space but still accessible. This is hack to make it possible to + * access the signal handler code in GDB. + */ + if ((addr & PAGE_MASK) == cris_signal_return_page) { + /* The trampoline page is globally mapped, no page table to traverse.*/ + tmp = *(unsigned long*)addr; + } else { + copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); + + if (copied != sizeof(tmp)) + break; + } + + ret = put_user(tmp,datap); + break; + } + + /* Read the word at location address in the USER area. */ + case PTRACE_PEEKUSR: { + unsigned long tmp; + + ret = -EIO; + if ((addr & 3) || regno > PT_MAX) + break; + + tmp = get_reg(child, regno); + ret = put_user(tmp, datap); + break; + } + + /* Write the word at location address. */ + case PTRACE_POKETEXT: + case PTRACE_POKEDATA: + ret = generic_ptrace_pokedata(child, addr, data); + break; + + /* Write the word at location address in the USER area. */ + case PTRACE_POKEUSR: + ret = -EIO; + if ((addr & 3) || regno > PT_MAX) + break; + + if (regno == PT_CCS) { + /* don't allow the tracing process to change stuff like + * interrupt enable, kernel/user bit, dma enables etc. + */ + data &= CCS_MASK; + data |= get_reg(child, PT_CCS) & ~CCS_MASK; + } + if (put_reg(child, regno, data)) + break; + ret = 0; + break; + + /* Get all GP registers from the child. */ + case PTRACE_GETREGS: { + int i; + unsigned long tmp; + + for (i = 0; i <= PT_MAX; i++) { + tmp = get_reg(child, i); + + if (put_user(tmp, datap)) { + ret = -EFAULT; + goto out_tsk; + } + + datap++; + } + + ret = 0; + break; + } + + /* Set all GP registers in the child. */ + case PTRACE_SETREGS: { + int i; + unsigned long tmp; + + for (i = 0; i <= PT_MAX; i++) { + if (get_user(tmp, datap)) { + ret = -EFAULT; + goto out_tsk; + } + + if (i == PT_CCS) { + tmp &= CCS_MASK; + tmp |= get_reg(child, PT_CCS) & ~CCS_MASK; + } + + put_reg(child, i, tmp); + datap++; + } + + ret = 0; + break; + } + + default: + ret = ptrace_request(child, request, addr, data); + break; + } + +out_tsk: + return ret; +} + +void do_syscall_trace(void) +{ + if (!test_thread_flag(TIF_SYSCALL_TRACE)) + return; + + if (!(current->ptrace & PT_PTRACED)) + return; + + /* the 0x80 provides a way for the tracing parent to distinguish + between a syscall stop and SIGTRAP delivery */ + ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) + ? 0x80 : 0)); + + /* + * This isn't the same as continuing with a signal, but it will do for + * normal use. + */ + if (current->exit_code) { + send_sig(current->exit_code, current, 1); + current->exit_code = 0; + } +} + +/* Returns the size of an instruction that has a delay slot. */ + +static int insn_size(struct task_struct *child, unsigned long pc) +{ + unsigned long opcode; + int copied; + int opsize = 0; + + /* Read the opcode at pc (do what PTRACE_PEEKTEXT would do). */ + copied = access_process_vm(child, pc, &opcode, sizeof(opcode), 0); + if (copied != sizeof(opcode)) + return 0; + + switch ((opcode & 0x0f00) >> 8) { + case 0x0: + case 0x9: + case 0xb: + opsize = 2; + break; + case 0xe: + case 0xf: + opsize = 6; + break; + case 0xd: + /* Could be 4 or 6; check more bits. */ + if ((opcode & 0xff) == 0xff) + opsize = 4; + else + opsize = 6; + break; + default: + panic("ERROR: Couldn't find size of opcode 0x%lx at 0x%lx\n", + opcode, pc); + } + + return opsize; +} + +static unsigned long get_pseudo_pc(struct task_struct *child) +{ + /* Default value for PC is ERP. */ + unsigned long pc = get_reg(child, PT_ERP); + + if (pc & 0x1) { + unsigned long spc = get_reg(child, PT_SPC); + /* Delay slot bit set. Report as stopped on proper + instruction. */ + if (spc) { + /* Rely on SPC if set. FIXME: We might want to check + that EXS indicates we stopped due to a single-step + exception. */ + pc = spc; + } else { + /* Calculate the PC from the size of the instruction + that the delay slot we're in belongs to. */ + pc += insn_size(child, pc & ~1) - 1; + } + } + return pc; +} + +static long bp_owner = 0; + +/* Reachable from exit_thread in signal.c, so not static. */ +void deconfigure_bp(long pid) +{ + int bp; + + /* Only deconfigure if the pid is the owner. */ + if (bp_owner != pid) + return; + + for (bp = 0; bp < 6; bp++) { + unsigned long tmp; + /* Deconfigure start and end address (also gets rid of ownership). */ + put_debugreg(pid, PT_BP + 3 + (bp * 2), 0); + put_debugreg(pid, PT_BP + 4 + (bp * 2), 0); + + /* Deconfigure relevant bits in control register. */ + tmp = get_debugreg(pid, PT_BP_CTRL) & ~(3 << (2 + (bp * 4))); + put_debugreg(pid, PT_BP_CTRL, tmp); + } + /* No owner now. */ + bp_owner = 0; +} + +static int put_debugreg(long pid, unsigned int regno, long data) +{ + int ret = 0; + register int old_srs; + +#ifdef CONFIG_ETRAX_KGDB + /* Ignore write, but pretend it was ok if value is 0 + (we don't want POKEUSR/SETREGS failing unnessecarily). */ + return (data == 0) ? ret : -1; +#endif + + /* Simple owner management. */ + if (!bp_owner) + bp_owner = pid; + else if (bp_owner != pid) { + /* Ignore write, but pretend it was ok if value is 0 + (we don't want POKEUSR/SETREGS failing unnessecarily). */ + return (data == 0) ? ret : -1; + } + + /* Remember old SRS. */ + SPEC_REG_RD(SPEC_REG_SRS, old_srs); + /* Switch to BP bank. */ + SUPP_BANK_SEL(BANK_BP); + + switch (regno - PT_BP) { + case 0: + SUPP_REG_WR(0, data); break; + case 1: + case 2: + if (data) + ret = -1; + break; + case 3: + SUPP_REG_WR(3, data); break; + case 4: + SUPP_REG_WR(4, data); break; + case 5: + SUPP_REG_WR(5, data); break; + case 6: + SUPP_REG_WR(6, data); break; + case 7: + SUPP_REG_WR(7, data); break; + case 8: + SUPP_REG_WR(8, data); break; + case 9: + SUPP_REG_WR(9, data); break; + case 10: + SUPP_REG_WR(10, data); break; + case 11: + SUPP_REG_WR(11, data); break; + case 12: + SUPP_REG_WR(12, data); break; + case 13: + SUPP_REG_WR(13, data); break; + case 14: + SUPP_REG_WR(14, data); break; + default: + ret = -1; + break; + } + + /* Restore SRS. */ + SPEC_REG_WR(SPEC_REG_SRS, old_srs); + /* Just for show. */ + NOP(); + NOP(); + NOP(); + + return ret; +} + +static long get_debugreg(long pid, unsigned int regno) +{ + register int old_srs; + register long data; + + if (pid != bp_owner) { + return 0; + } + + /* Remember old SRS. */ + SPEC_REG_RD(SPEC_REG_SRS, old_srs); + /* Switch to BP bank. */ + SUPP_BANK_SEL(BANK_BP); + + switch (regno - PT_BP) { + case 0: + SUPP_REG_RD(0, data); break; + case 1: + case 2: + /* error return value? */ + data = 0; + break; + case 3: + SUPP_REG_RD(3, data); break; + case 4: + SUPP_REG_RD(4, data); break; + case 5: + SUPP_REG_RD(5, data); break; + case 6: + SUPP_REG_RD(6, data); break; + case 7: + SUPP_REG_RD(7, data); break; + case 8: + SUPP_REG_RD(8, data); break; + case 9: + SUPP_REG_RD(9, data); break; + case 10: + SUPP_REG_RD(10, data); break; + case 11: + SUPP_REG_RD(11, data); break; + case 12: + SUPP_REG_RD(12, data); break; + case 13: + SUPP_REG_RD(13, data); break; + case 14: + SUPP_REG_RD(14, data); break; + default: + /* error return value? */ + data = 0; + } + + /* Restore SRS. */ + SPEC_REG_WR(SPEC_REG_SRS, old_srs); + /* Just for show. */ + NOP(); + NOP(); + NOP(); + + return data; +} diff --git a/arch/cris/arch-v32/kernel/setup.c b/arch/cris/arch-v32/kernel/setup.c new file mode 100644 index 000000000..cd1865d68 --- /dev/null +++ b/arch/cris/arch-v32/kernel/setup.c @@ -0,0 +1,170 @@ +/* + * Display CPU info in /proc/cpuinfo. + * + * Copyright (C) 2003, Axis Communications AB. + */ + +#include <linux/seq_file.h> +#include <linux/proc_fs.h> +#include <linux/delay.h> +#include <linux/param.h> + +#include <linux/i2c.h> +#include <linux/platform_device.h> + +#ifdef CONFIG_PROC_FS + +#define HAS_FPU 0x0001 +#define HAS_MMU 0x0002 +#define HAS_ETHERNET100 0x0004 +#define HAS_TOKENRING 0x0008 +#define HAS_SCSI 0x0010 +#define HAS_ATA 0x0020 +#define HAS_USB 0x0040 +#define HAS_IRQ_BUG 0x0080 +#define HAS_MMU_BUG 0x0100 + +struct cpu_info { + char *cpu_model; + unsigned short rev; + unsigned short cache_size; + unsigned short flags; +}; + +/* Some of these model are here for historical reasons only. */ +static struct cpu_info cpinfo[] = { + {"ETRAX 1", 0, 0, 0}, + {"ETRAX 2", 1, 0, 0}, + {"ETRAX 3", 2, 0, 0}, + {"ETRAX 4", 3, 0, 0}, + {"Simulator", 7, 8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA}, + {"ETRAX 100", 8, 8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA | HAS_IRQ_BUG}, + {"ETRAX 100", 9, 8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA}, + + {"ETRAX 100LX", 10, 8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA | HAS_USB + | HAS_MMU | HAS_MMU_BUG}, + + {"ETRAX 100LX v2", 11, 8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA | HAS_USB + | HAS_MMU}, +#ifdef CONFIG_ETRAXFS + {"ETRAX FS", 32, 32, HAS_ETHERNET100 | HAS_ATA | HAS_MMU}, +#else + {"ARTPEC-3", 32, 32, HAS_ETHERNET100 | HAS_MMU}, +#endif + {"Unknown", 0, 0, 0} +}; + +int show_cpuinfo(struct seq_file *m, void *v) +{ + int i; + int cpu = (int)v - 1; + unsigned long revision; + struct cpu_info *info; + + info = &cpinfo[ARRAY_SIZE(cpinfo) - 1]; + + revision = rdvr(); + + for (i = 0; i < ARRAY_SIZE(cpinfo); i++) { + if (cpinfo[i].rev == revision) { + info = &cpinfo[i]; + break; + } + } + + seq_printf(m, + "processor\t: %d\n" + "cpu\t\t: CRIS\n" + "cpu revision\t: %lu\n" + "cpu model\t: %s\n" + "cache size\t: %d KB\n" + "fpu\t\t: %s\n" + "mmu\t\t: %s\n" + "mmu DMA bug\t: %s\n" + "ethernet\t: %s Mbps\n" + "token ring\t: %s\n" + "scsi\t\t: %s\n" + "ata\t\t: %s\n" + "usb\t\t: %s\n" + "bogomips\t: %lu.%02lu\n\n", + + cpu, + revision, + info->cpu_model, + info->cache_size, + info->flags & HAS_FPU ? "yes" : "no", + info->flags & HAS_MMU ? "yes" : "no", + info->flags & HAS_MMU_BUG ? "yes" : "no", + info->flags & HAS_ETHERNET100 ? "10/100" : "10", + info->flags & HAS_TOKENRING ? "4/16 Mbps" : "no", + info->flags & HAS_SCSI ? "yes" : "no", + info->flags & HAS_ATA ? "yes" : "no", + info->flags & HAS_USB ? "yes" : "no", + (loops_per_jiffy * HZ + 500) / 500000, + ((loops_per_jiffy * HZ + 500) / 5000) % 100); + + return 0; +} + +#endif /* CONFIG_PROC_FS */ + +void show_etrax_copyright(void) +{ +#ifdef CONFIG_ETRAXFS + printk(KERN_INFO "Linux/CRISv32 port on ETRAX FS " + "(C) 2003, 2004 Axis Communications AB\n"); +#else + printk(KERN_INFO "Linux/CRISv32 port on ARTPEC-3 " + "(C) 2003-2009 Axis Communications AB\n"); +#endif +} + +static struct i2c_board_info __initdata i2c_info[] = { + {I2C_BOARD_INFO("camblock", 0x43)}, + {I2C_BOARD_INFO("tmp100", 0x48)}, + {I2C_BOARD_INFO("tmp100", 0x4A)}, + {I2C_BOARD_INFO("tmp100", 0x4C)}, + {I2C_BOARD_INFO("tmp100", 0x4D)}, + {I2C_BOARD_INFO("tmp100", 0x4E)}, +#ifdef CONFIG_RTC_DRV_PCF8563 + {I2C_BOARD_INFO("pcf8563", 0x51)}, +#endif +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + {I2C_BOARD_INFO("vgpio", 0x20)}, + {I2C_BOARD_INFO("vgpio", 0x21)}, +#endif + {I2C_BOARD_INFO("pca9536", 0x41)}, + {I2C_BOARD_INFO("fnp300", 0x40)}, + {I2C_BOARD_INFO("fnp300", 0x42)}, + {I2C_BOARD_INFO("adc101", 0x54)}, +}; + +static struct i2c_board_info __initdata i2c_info2[] = { + {I2C_BOARD_INFO("camblock", 0x43)}, + {I2C_BOARD_INFO("tmp100", 0x48)}, + {I2C_BOARD_INFO("tmp100", 0x4A)}, + {I2C_BOARD_INFO("tmp100", 0x4C)}, + {I2C_BOARD_INFO("tmp100", 0x4D)}, + {I2C_BOARD_INFO("tmp100", 0x4E)}, +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + {I2C_BOARD_INFO("vgpio", 0x20)}, + {I2C_BOARD_INFO("vgpio", 0x21)}, +#endif + {I2C_BOARD_INFO("pca9536", 0x41)}, + {I2C_BOARD_INFO("fnp300", 0x40)}, + {I2C_BOARD_INFO("fnp300", 0x42)}, + {I2C_BOARD_INFO("adc101", 0x54)}, +}; + +static struct i2c_board_info __initdata i2c_info3[] = { + {I2C_BOARD_INFO("adc101", 0x54)}, +}; + +static int __init etrax_init(void) +{ + i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info)); + i2c_register_board_info(1, i2c_info2, ARRAY_SIZE(i2c_info2)); + i2c_register_board_info(2, i2c_info3, ARRAY_SIZE(i2c_info3)); + return 0; +} +arch_initcall(etrax_init); diff --git a/arch/cris/arch-v32/kernel/signal.c b/arch/cris/arch-v32/kernel/signal.c new file mode 100644 index 000000000..3a36ae6b7 --- /dev/null +++ b/arch/cris/arch-v32/kernel/signal.c @@ -0,0 +1,540 @@ +/* + * Copyright (C) 2003, Axis Communications AB. + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/syscalls.h> +#include <linux/vmalloc.h> + +#include <asm/io.h> +#include <asm/processor.h> +#include <asm/ucontext.h> +#include <asm/uaccess.h> +#include <arch/ptrace.h> +#include <arch/hwregs/cpu_vect.h> + +extern unsigned long cris_signal_return_page; + +/* + * A syscall in CRIS is really a "break 13" instruction, which is 2 + * bytes. The registers is manipulated so upon return the instruction + * will be executed again. + * + * This relies on that PC points to the instruction after the break call. + */ +#define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->erp -= 2; + +/* Signal frames. */ +struct signal_frame { + struct sigcontext sc; + unsigned long extramask[_NSIG_WORDS - 1]; + unsigned char retcode[8]; /* Trampoline code. */ +}; + +struct rt_signal_frame { + struct siginfo *pinfo; + void *puc; + struct siginfo info; + struct ucontext uc; + unsigned char retcode[8]; /* Trampoline code. */ +}; + +void do_signal(int restart, struct pt_regs *regs); +void keep_debug_flags(unsigned long oldccs, unsigned long oldspc, + struct pt_regs *regs); + +static int +restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) +{ + unsigned int err = 0; + unsigned long old_usp; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + /* + * Restore the registers from &sc->regs. sc is already checked + * for VERIFY_READ since the signal_frame was previously + * checked in sys_sigreturn(). + */ + if (__copy_from_user(regs, sc, sizeof(struct pt_regs))) + goto badframe; + + /* Make that the user-mode flag is set. */ + regs->ccs |= (1 << (U_CCS_BITNR + CCS_SHIFT)); + + /* Don't perform syscall restarting */ + regs->exs = -1; + + /* Restore the old USP. */ + err |= __get_user(old_usp, &sc->usp); + wrusp(old_usp); + + return err; + +badframe: + return 1; +} + +asmlinkage int sys_sigreturn(void) +{ + struct pt_regs *regs = current_pt_regs(); + sigset_t set; + struct signal_frame __user *frame; + unsigned long oldspc = regs->spc; + unsigned long oldccs = regs->ccs; + + frame = (struct signal_frame *) rdusp(); + + /* + * Since the signal is stacked on a dword boundary, the frame + * should be dword aligned here as well. It it's not, then the + * user is trying some funny business. + */ + if (((long)frame) & 3) + goto badframe; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + + if (__get_user(set.sig[0], &frame->sc.oldmask) || + (_NSIG_WORDS > 1 && __copy_from_user(&set.sig[1], + frame->extramask, + sizeof(frame->extramask)))) + goto badframe; + + set_current_blocked(&set); + + if (restore_sigcontext(regs, &frame->sc)) + goto badframe; + + keep_debug_flags(oldccs, oldspc, regs); + + return regs->r10; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +asmlinkage int sys_rt_sigreturn(void) +{ + struct pt_regs *regs = current_pt_regs(); + sigset_t set; + struct rt_signal_frame __user *frame; + unsigned long oldspc = regs->spc; + unsigned long oldccs = regs->ccs; + + frame = (struct rt_signal_frame *) rdusp(); + + /* + * Since the signal is stacked on a dword boundary, the frame + * should be dword aligned here as well. It it's not, then the + * user is trying some funny business. + */ + if (((long)frame) & 3) + goto badframe; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + + if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) + goto badframe; + + set_current_blocked(&set); + + if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) + goto badframe; + + if (restore_altstack(&frame->uc.uc_stack)) + goto badframe; + + keep_debug_flags(oldccs, oldspc, regs); + + return regs->r10; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +/* Setup a signal frame. */ +static int +setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, + unsigned long mask) +{ + int err; + unsigned long usp; + + err = 0; + usp = rdusp(); + + /* + * Copy the registers. They are located first in sc, so it's + * possible to use sc directly. + */ + err |= __copy_to_user(sc, regs, sizeof(struct pt_regs)); + + err |= __put_user(mask, &sc->oldmask); + err |= __put_user(usp, &sc->usp); + + return err; +} + +/* Figure out where to put the new signal frame - usually on the stack. */ +static inline void __user * +get_sigframe(struct ksignal *ksig, size_t frame_size) +{ + unsigned long sp = sigsp(rdusp(), ksig); + + /* Make sure the frame is dword-aligned. */ + sp &= ~3; + + return (void __user *)(sp - frame_size); +} + +/* Grab and setup a signal frame. + * + * Basically a lot of state-info is stacked, and arranged for the + * user-mode program to return to the kernel using either a trampiline + * which performs the syscall sigreturn(), or a provided user-mode + * trampoline. + */ +static int +setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) +{ + int err; + unsigned long return_ip; + struct signal_frame __user *frame; + + err = 0; + frame = get_sigframe(ksig, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + return -EFAULT; + + err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); + + if (err) + return -EFAULT; + + if (_NSIG_WORDS > 1) { + err |= __copy_to_user(frame->extramask, &set->sig[1], + sizeof(frame->extramask)); + } + + if (err) + return -EFAULT; + + /* + * Set up to return from user-space. If provided, use a stub + * already located in user-space. + */ + if (ksig->ka.sa.sa_flags & SA_RESTORER) { + return_ip = (unsigned long)ksig->ka.sa.sa_restorer; + } else { + /* Trampoline - the desired return ip is in the signal return page. */ + return_ip = cris_signal_return_page; + + /* + * This is movu.w __NR_sigreturn, r9; break 13; + * + * WE DO NOT USE IT ANY MORE! It's only left here for historical + * reasons and because gdb uses it as a signature to notice + * signal handler stack frames. + */ + err |= __put_user(0x9c5f, (short __user*)(frame->retcode+0)); + err |= __put_user(__NR_sigreturn, (short __user*)(frame->retcode+2)); + err |= __put_user(0xe93d, (short __user*)(frame->retcode+4)); + } + + if (err) + return -EFAULT; + + /* + * Set up registers for signal handler. + * + * Where the code enters now. + * Where the code enter later. + * First argument, signo. + */ + regs->erp = (unsigned long) ksig->ka.sa.sa_handler; + regs->srp = return_ip; + regs->r10 = ksig->sig; + + /* Actually move the USP to reflect the stacked frame. */ + wrusp((unsigned long)frame); + + return 0; +} + +static int +setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) +{ + int err; + unsigned long return_ip; + struct rt_signal_frame __user *frame; + + err = 0; + frame = get_sigframe(ksig, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + return -EFAULT; + + err |= __put_user(&frame->info, &frame->pinfo); + err |= __put_user(&frame->uc, &frame->puc); + err |= copy_siginfo_to_user(&frame->info, &ksig->info); + + if (err) + return -EFAULT; + + /* Clear all the bits of the ucontext we don't use. */ + err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext)); + err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); + err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); + err |= __save_altstack(&frame->uc.uc_stack, rdusp()); + + if (err) + return -EFAULT; + + /* + * Set up to return from user-space. If provided, use a stub + * already located in user-space. + */ + if (ksig->ka.sa.sa_flags & SA_RESTORER) { + return_ip = (unsigned long) ksig->ka.sa.sa_restorer; + } else { + /* Trampoline - the desired return ip is in the signal return page. */ + return_ip = cris_signal_return_page + 6; + + /* + * This is movu.w __NR_rt_sigreturn, r9; break 13; + * + * WE DO NOT USE IT ANY MORE! It's only left here for historical + * reasons and because gdb uses it as a signature to notice + * signal handler stack frames. + */ + err |= __put_user(0x9c5f, (short __user*)(frame->retcode+0)); + + err |= __put_user(__NR_rt_sigreturn, + (short __user*)(frame->retcode+2)); + + err |= __put_user(0xe93d, (short __user*)(frame->retcode+4)); + } + + if (err) + return -EFAULT; + + /* + * Set up registers for signal handler. + * + * Where the code enters now. + * Where the code enters later. + * First argument is signo. + * Second argument is (siginfo_t *). + * Third argument is unused. + */ + regs->erp = (unsigned long) ksig->ka.sa.sa_handler; + regs->srp = return_ip; + regs->r10 = ksig->sig; + regs->r11 = (unsigned long) &frame->info; + regs->r12 = 0; + + /* Actually move the usp to reflect the stacked frame. */ + wrusp((unsigned long)frame); + + return 0; +} + +/* Invoke a signal handler to, well, handle the signal. */ +static inline void +handle_signal(int canrestart, struct ksignal *ksig, struct pt_regs *regs) +{ + sigset_t *oldset = sigmask_to_save(); + int ret; + + /* Check if this got called from a system call. */ + if (canrestart) { + /* If so, check system call restarting. */ + switch (regs->r10) { + case -ERESTART_RESTARTBLOCK: + case -ERESTARTNOHAND: + /* + * This means that the syscall should + * only be restarted if there was no + * handler for the signal, and since + * this point isn't reached unless + * there is a handler, there's no need + * to restart. + */ + regs->r10 = -EINTR; + break; + + case -ERESTARTSYS: + /* + * This means restart the syscall if + * there is no handler, or the handler + * was registered with SA_RESTART. + */ + if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { + regs->r10 = -EINTR; + break; + } + + /* Fall through. */ + + case -ERESTARTNOINTR: + /* + * This means that the syscall should + * be called again after the signal + * handler returns. + */ + RESTART_CRIS_SYS(regs); + break; + } + } + + /* Set up the stack frame. */ + if (ksig->ka.sa.sa_flags & SA_SIGINFO) + ret = setup_rt_frame(ksig, oldset, regs); + else + ret = setup_frame(ksig, oldset, regs); + + signal_setup_done(ret, ksig, 0); +} + +/* + * Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + * + * Also note that the regs structure given here as an argument, is the latest + * pushed pt_regs. It may or may not be the same as the first pushed registers + * when the initial usermode->kernelmode transition took place. Therefore + * we can use user_mode(regs) to see if we came directly from kernel or user + * mode below. + */ +void +do_signal(int canrestart, struct pt_regs *regs) +{ + struct ksignal ksig; + + canrestart = canrestart && ((int)regs->exs >= 0); + + /* + * The common case should go fast, which is why this point is + * reached from kernel-mode. If that's the case, just return + * without doing anything. + */ + if (!user_mode(regs)) + return; + + if (get_signal(&ksig)) { + /* Whee! Actually deliver the signal. */ + handle_signal(canrestart, &ksig, regs); + return; + } + + /* Got here from a system call? */ + if (canrestart) { + /* Restart the system call - no handlers present. */ + if (regs->r10 == -ERESTARTNOHAND || + regs->r10 == -ERESTARTSYS || + regs->r10 == -ERESTARTNOINTR) { + RESTART_CRIS_SYS(regs); + } + + if (regs->r10 == -ERESTART_RESTARTBLOCK){ + regs->r9 = __NR_restart_syscall; + regs->erp -= 2; + } + } + + /* if there's no signal to deliver, we just put the saved sigmask + * back */ + restore_saved_sigmask(); +} + +asmlinkage void +ugdb_trap_user(struct thread_info *ti, int sig) +{ + if (((user_regs(ti)->exs & 0xff00) >> 8) != SINGLE_STEP_INTR_VECT) { + /* Zero single-step PC if the reason we stopped wasn't a single + step exception. This is to avoid relying on it when it isn't + reliable. */ + user_regs(ti)->spc = 0; + } + /* FIXME: Filter out false h/w breakpoint hits (i.e. EDA + not within any configured h/w breakpoint range). Synchronize with + what already exists for kernel debugging. */ + if (((user_regs(ti)->exs & 0xff00) >> 8) == BREAK_8_INTR_VECT) { + /* Break 8: subtract 2 from ERP unless in a delay slot. */ + if (!(user_regs(ti)->erp & 0x1)) + user_regs(ti)->erp -= 2; + } + sys_kill(ti->task->pid, sig); +} + +void +keep_debug_flags(unsigned long oldccs, unsigned long oldspc, + struct pt_regs *regs) +{ + if (oldccs & (1 << Q_CCS_BITNR)) { + /* Pending single step due to single-stepping the break 13 + in the signal trampoline: keep the Q flag. */ + regs->ccs |= (1 << Q_CCS_BITNR); + /* S flag should be set - complain if it's not. */ + if (!(oldccs & (1 << (S_CCS_BITNR + CCS_SHIFT)))) { + printk("Q flag but no S flag?"); + } + regs->ccs |= (1 << (S_CCS_BITNR + CCS_SHIFT)); + /* Assume the SPC is valid and interesting. */ + regs->spc = oldspc; + + } else if (oldccs & (1 << (S_CCS_BITNR + CCS_SHIFT))) { + /* If a h/w bp was set in the signal handler we need + to keep the S flag. */ + regs->ccs |= (1 << (S_CCS_BITNR + CCS_SHIFT)); + /* Don't keep the old SPC though; if we got here due to + a single-step, the Q flag should have been set. */ + } else if (regs->spc) { + /* If we were single-stepping *before* the signal was taken, + we don't want to restore that state now, because GDB will + have forgotten all about it. */ + regs->spc = 0; + regs->ccs &= ~(1 << (S_CCS_BITNR + CCS_SHIFT)); + } +} + +/* Set up the trampolines on the signal return page. */ +int __init +cris_init_signal(void) +{ + u16* data = kmalloc(PAGE_SIZE, GFP_KERNEL); + + /* This is movu.w __NR_sigreturn, r9; break 13; */ + data[0] = 0x9c5f; + data[1] = __NR_sigreturn; + data[2] = 0xe93d; + /* This is movu.w __NR_rt_sigreturn, r9; break 13; */ + data[3] = 0x9c5f; + data[4] = __NR_rt_sigreturn; + data[5] = 0xe93d; + + /* Map to userspace with appropriate permissions (no write access...) */ + cris_signal_return_page = (unsigned long) + __ioremap_prot(virt_to_phys(data), PAGE_SIZE, PAGE_SIGNAL_TRAMPOLINE); + + return 0; +} + +__initcall(cris_init_signal); diff --git a/arch/cris/arch-v32/kernel/time.c b/arch/cris/arch-v32/kernel/time.c new file mode 100644 index 000000000..4fce9f1f7 --- /dev/null +++ b/arch/cris/arch-v32/kernel/time.c @@ -0,0 +1,342 @@ +/* + * linux/arch/cris/arch-v32/kernel/time.c + * + * Copyright (C) 2003-2010 Axis Communications AB + * + */ + +#include <linux/timex.h> +#include <linux/time.h> +#include <linux/clocksource.h> +#include <linux/clockchips.h> +#include <linux/interrupt.h> +#include <linux/swap.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/threads.h> +#include <linux/cpufreq.h> +#include <linux/sched_clock.h> +#include <linux/mm.h> +#include <asm/types.h> +#include <asm/signal.h> +#include <asm/io.h> +#include <asm/delay.h> +#include <asm/irq.h> +#include <asm/irq_regs.h> + +#include <hwregs/reg_map.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/timer_defs.h> +#include <hwregs/intr_vect_defs.h> +#ifdef CONFIG_CRIS_MACH_ARTPEC3 +#include <hwregs/clkgen_defs.h> +#endif + +/* Watchdog defines */ +#define ETRAX_WD_KEY_MASK 0x7F /* key is 7 bit */ +#define ETRAX_WD_HZ 763 /* watchdog counts at 763 Hz */ +/* Number of 763 counts before watchdog bites */ +#define ETRAX_WD_CNT ((2*ETRAX_WD_HZ)/HZ + 1) + +#define CRISV32_TIMER_FREQ (100000000lu) + +unsigned long timer_regs[NR_CPUS] = +{ + regi_timer0, +}; + +extern int set_rtc_mmss(unsigned long nowtime); + +#ifdef CONFIG_CPU_FREQ +static int cris_time_freq_notifier(struct notifier_block *nb, + unsigned long val, void *data); + +static struct notifier_block cris_time_freq_notifier_block = { + .notifier_call = cris_time_freq_notifier, +}; +#endif + +unsigned long get_ns_in_jiffie(void) +{ + reg_timer_r_tmr0_data data; + unsigned long ns; + + data = REG_RD(timer, regi_timer0, r_tmr0_data); + ns = (TIMER0_DIV - data) * 10; + return ns; +} + +/* From timer MDS describing the hardware watchdog: + * 4.3.1 Watchdog Operation + * The watchdog timer is an 8-bit timer with a configurable start value. + * Once started the watchdog counts downwards with a frequency of 763 Hz + * (100/131072 MHz). When the watchdog counts down to 1, it generates an + * NMI (Non Maskable Interrupt), and when it counts down to 0, it resets the + * chip. + */ +/* This gives us 1.3 ms to do something useful when the NMI comes */ + +/* Right now, starting the watchdog is the same as resetting it */ +#define start_watchdog reset_watchdog + +#if defined(CONFIG_ETRAX_WATCHDOG) +static short int watchdog_key = 42; /* arbitrary 7 bit number */ +#endif + +/* Number of pages to consider "out of memory". It is normal that the memory + * is used though, so set this really low. */ +#define WATCHDOG_MIN_FREE_PAGES 8 + +#if defined(CONFIG_ETRAX_WATCHDOG_NICE_DOGGY) +/* for reliable NICE_DOGGY behaviour */ +static int bite_in_progress; +#endif + +void reset_watchdog(void) +{ +#if defined(CONFIG_ETRAX_WATCHDOG) + reg_timer_rw_wd_ctrl wd_ctrl = { 0 }; + +#if defined(CONFIG_ETRAX_WATCHDOG_NICE_DOGGY) + if (unlikely(bite_in_progress)) + return; +#endif + /* Only keep watchdog happy as long as we have memory left! */ + if(nr_free_pages() > WATCHDOG_MIN_FREE_PAGES) { + /* Reset the watchdog with the inverse of the old key */ + /* Invert key, which is 7 bits */ + watchdog_key ^= ETRAX_WD_KEY_MASK; + wd_ctrl.cnt = ETRAX_WD_CNT; + wd_ctrl.cmd = regk_timer_start; + wd_ctrl.key = watchdog_key; + REG_WR(timer, regi_timer0, rw_wd_ctrl, wd_ctrl); + } +#endif +} + +/* stop the watchdog - we still need the correct key */ + +void stop_watchdog(void) +{ +#if defined(CONFIG_ETRAX_WATCHDOG) + reg_timer_rw_wd_ctrl wd_ctrl = { 0 }; + watchdog_key ^= ETRAX_WD_KEY_MASK; /* invert key, which is 7 bits */ + wd_ctrl.cnt = ETRAX_WD_CNT; + wd_ctrl.cmd = regk_timer_stop; + wd_ctrl.key = watchdog_key; + REG_WR(timer, regi_timer0, rw_wd_ctrl, wd_ctrl); +#endif +} + +extern void show_registers(struct pt_regs *regs); + +void handle_watchdog_bite(struct pt_regs *regs) +{ +#if defined(CONFIG_ETRAX_WATCHDOG) + extern int cause_of_death; + + nmi_enter(); + oops_in_progress = 1; +#if defined(CONFIG_ETRAX_WATCHDOG_NICE_DOGGY) + bite_in_progress = 1; +#endif + printk(KERN_WARNING "Watchdog bite\n"); + + /* Check if forced restart or unexpected watchdog */ + if (cause_of_death == 0xbedead) { +#ifdef CONFIG_CRIS_MACH_ARTPEC3 + /* There is a bug in Artpec-3 (voodoo TR 78) that requires + * us to go to lower frequency for the reset to be reliable + */ + reg_clkgen_rw_clk_ctrl ctrl = + REG_RD(clkgen, regi_clkgen, rw_clk_ctrl); + ctrl.pll = 0; + REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, ctrl); +#endif + while(1); + } + + /* Unexpected watchdog, stop the watchdog and dump registers. */ + stop_watchdog(); + printk(KERN_WARNING "Oops: bitten by watchdog\n"); + show_registers(regs); + oops_in_progress = 0; + printk("\n"); /* Flush mtdoops. */ +#ifndef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY + reset_watchdog(); +#endif + while(1) /* nothing */; +#endif +} + +extern void cris_profile_sample(struct pt_regs *regs); +static void __iomem *timer_base; + +static void crisv32_clkevt_mode(enum clock_event_mode mode, + struct clock_event_device *dev) +{ + reg_timer_rw_tmr0_ctrl ctrl = { + .op = regk_timer_hold, + .freq = regk_timer_f100, + }; + + REG_WR(timer, timer_base, rw_tmr0_ctrl, ctrl); +} + +static int crisv32_clkevt_next_event(unsigned long evt, + struct clock_event_device *dev) +{ + reg_timer_rw_tmr0_ctrl ctrl = { + .op = regk_timer_ld, + .freq = regk_timer_f100, + }; + + REG_WR(timer, timer_base, rw_tmr0_div, evt); + REG_WR(timer, timer_base, rw_tmr0_ctrl, ctrl); + + ctrl.op = regk_timer_run; + REG_WR(timer, timer_base, rw_tmr0_ctrl, ctrl); + + return 0; +} + +static irqreturn_t crisv32_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *evt = dev_id; + reg_timer_rw_tmr0_ctrl ctrl = { + .op = regk_timer_hold, + .freq = regk_timer_f100, + }; + reg_timer_rw_ack_intr ack = { .tmr0 = 1 }; + reg_timer_r_masked_intr intr; + + intr = REG_RD(timer, timer_base, r_masked_intr); + if (!intr.tmr0) + return IRQ_NONE; + + REG_WR(timer, timer_base, rw_tmr0_ctrl, ctrl); + REG_WR(timer, timer_base, rw_ack_intr, ack); + + reset_watchdog(); +#ifdef CONFIG_SYSTEM_PROFILER + cris_profile_sample(get_irq_regs()); +#endif + + evt->event_handler(evt); + + return IRQ_HANDLED; +} + +static struct clock_event_device crisv32_clockevent = { + .name = "crisv32-timer", + .rating = 300, + .features = CLOCK_EVT_FEAT_ONESHOT, + .set_mode = crisv32_clkevt_mode, + .set_next_event = crisv32_clkevt_next_event, +}; + +/* Timer is IRQF_SHARED so drivers can add stuff to the timer irq chain. */ +static struct irqaction irq_timer = { + .handler = crisv32_timer_interrupt, + .flags = IRQF_TIMER | IRQF_SHARED, + .name = "crisv32-timer", + .dev_id = &crisv32_clockevent, +}; + +static u64 notrace crisv32_timer_sched_clock(void) +{ + return REG_RD(timer, timer_base, r_time); +} + +static void __init crisv32_timer_init(void) +{ + reg_timer_rw_intr_mask timer_intr_mask; + reg_timer_rw_tmr0_ctrl ctrl = { + .op = regk_timer_hold, + .freq = regk_timer_f100, + }; + + REG_WR(timer, timer_base, rw_tmr0_ctrl, ctrl); + + timer_intr_mask = REG_RD(timer, timer_base, rw_intr_mask); + timer_intr_mask.tmr0 = 1; + REG_WR(timer, timer_base, rw_intr_mask, timer_intr_mask); +} + +void __init time_init(void) +{ + int irq; + int ret; + + /* Probe for the RTC and read it if it exists. + * Before the RTC can be probed the loops_per_usec variable needs + * to be initialized to make usleep work. A better value for + * loops_per_usec is calculated by the kernel later once the + * clock has started. + */ + loops_per_usec = 50; + + irq = TIMER0_INTR_VECT; + timer_base = (void __iomem *) regi_timer0; + + crisv32_timer_init(); + + sched_clock_register(crisv32_timer_sched_clock, 32, + CRISV32_TIMER_FREQ); + + clocksource_mmio_init(timer_base + REG_RD_ADDR_timer_r_time, + "crisv32-timer", CRISV32_TIMER_FREQ, + 300, 32, clocksource_mmio_readl_up); + + crisv32_clockevent.cpumask = cpu_possible_mask; + crisv32_clockevent.irq = irq; + + ret = setup_irq(irq, &irq_timer); + if (ret) + pr_warn("failed to setup irq %d\n", irq); + + clockevents_config_and_register(&crisv32_clockevent, + CRISV32_TIMER_FREQ, + 2, 0xffffffff); + + /* Enable watchdog if we should use one. */ + +#if defined(CONFIG_ETRAX_WATCHDOG) + printk(KERN_INFO "Enabling watchdog...\n"); + start_watchdog(); + + /* If we use the hardware watchdog, we want to trap it as an NMI + * and dump registers before it resets us. For this to happen, we + * must set the "m" NMI enable flag (which once set, is unset only + * when an NMI is taken). */ + { + unsigned long flags; + local_save_flags(flags); + flags |= (1<<30); /* NMI M flag is at bit 30 */ + local_irq_restore(flags); + } +#endif + +#ifdef CONFIG_CPU_FREQ + cpufreq_register_notifier(&cris_time_freq_notifier_block, + CPUFREQ_TRANSITION_NOTIFIER); +#endif +} + +#ifdef CONFIG_CPU_FREQ +static int cris_time_freq_notifier(struct notifier_block *nb, + unsigned long val, void *data) +{ + struct cpufreq_freqs *freqs = data; + if (val == CPUFREQ_POSTCHANGE) { + reg_timer_r_tmr0_data data; + reg_timer_rw_tmr0_div div = (freqs->new * 500) / HZ; + do { + data = REG_RD(timer, timer_regs[freqs->cpu], + r_tmr0_data); + } while (data > 20); + REG_WR(timer, timer_regs[freqs->cpu], rw_tmr0_div, div); + } + return 0; +} +#endif diff --git a/arch/cris/arch-v32/kernel/traps.c b/arch/cris/arch-v32/kernel/traps.c new file mode 100644 index 000000000..8bbe09c93 --- /dev/null +++ b/arch/cris/arch-v32/kernel/traps.c @@ -0,0 +1,193 @@ +/* + * Copyright (C) 2003-2006, Axis Communications AB. + */ + +#include <linux/ptrace.h> +#include <linux/module.h> +#include <asm/uaccess.h> +#include <hwregs/supp_reg.h> +#include <hwregs/intr_vect_defs.h> +#include <asm/irq.h> + +void show_registers(struct pt_regs *regs) +{ + /* + * It's possible to use either the USP register or current->thread.usp. + * USP might not correspond to the current process for all cases this + * function is called, and current->thread.usp isn't up to date for the + * current process. Experience shows that using USP is the way to go. + */ + unsigned long usp = rdusp(); + unsigned long d_mmu_cause; + unsigned long i_mmu_cause; + + printk("CPU: %d\n", smp_processor_id()); + + printk("ERP: %08lx SRP: %08lx CCS: %08lx USP: %08lx MOF: %08lx\n", + regs->erp, regs->srp, regs->ccs, usp, regs->mof); + + printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", + regs->r0, regs->r1, regs->r2, regs->r3); + + printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", + regs->r4, regs->r5, regs->r6, regs->r7); + + printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", + regs->r8, regs->r9, regs->r10, regs->r11); + + printk("r12: %08lx r13: %08lx oR10: %08lx acr: %08lx\n", + regs->r12, regs->r13, regs->orig_r10, regs->acr); + + printk(" sp: %08lx\n", (unsigned long)regs); + + SUPP_BANK_SEL(BANK_IM); + SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause); + + SUPP_BANK_SEL(BANK_DM); + SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause); + + printk(" Data MMU Cause: %08lx\n", d_mmu_cause); + printk("Instruction MMU Cause: %08lx\n", i_mmu_cause); + + printk("Process %s (pid: %d, stackpage=%08lx)\n", + current->comm, current->pid, (unsigned long)current); + + /* + * When in-kernel, we also print out the stack and code at the + * time of the fault.. + */ + if (!user_mode(regs)) { + int i; + + show_stack(NULL, (unsigned long *)usp); + + /* + * If the previous stack-dump wasn't a kernel one, dump the + * kernel stack now. + */ + if (usp != 0) + show_stack(NULL, NULL); + + printk("\nCode: "); + + if (regs->erp < PAGE_OFFSET) + goto bad_value; + + /* + * Quite often the value at regs->erp doesn't point to the + * interesting instruction, which often is the previous + * instruction. So dump at an offset large enough that the + * instruction decoding should be in sync at the interesting + * point, but small enough to fit on a row. The regs->erp + * location is pointed out in a ksymoops-friendly way by + * wrapping the byte for that address in parenthesises. + */ + for (i = -12; i < 12; i++) { + unsigned char c; + + if (__get_user(c, &((unsigned char *)regs->erp)[i])) { +bad_value: + printk(" Bad IP value."); + break; + } + + if (i == 0) + printk("(%02x) ", c); + else + printk("%02x ", c); + } + printk("\n"); + } +} + +void arch_enable_nmi(void) +{ + unsigned long flags; + + local_save_flags(flags); + flags |= (1 << 30); /* NMI M flag is at bit 30 */ + local_irq_restore(flags); +} + +extern void (*nmi_handler)(struct pt_regs *); +void handle_nmi(struct pt_regs *regs) +{ +#ifdef CONFIG_ETRAXFS + reg_intr_vect_r_nmi r; +#endif + + if (nmi_handler) + nmi_handler(regs); + +#ifdef CONFIG_ETRAXFS + /* Wait until nmi is no longer active. */ + do { + r = REG_RD(intr_vect, regi_irq, r_nmi); + } while (r.ext == regk_intr_vect_on); +#endif +} + + +#ifdef CONFIG_BUG +extern void die_if_kernel(const char *str, struct pt_regs *regs, long err); + +/* Copy of the regs at BUG() time. */ +struct pt_regs BUG_regs; + +void do_BUG(char *file, unsigned int line) +{ + printk("kernel BUG at %s:%d!\n", file, line); + die_if_kernel("Oops", &BUG_regs, 0); +} +EXPORT_SYMBOL(do_BUG); + +void fixup_BUG(struct pt_regs *regs) +{ + BUG_regs = *regs; + +#ifdef CONFIG_DEBUG_BUGVERBOSE + /* + * Fixup the BUG arguments through exception handlers. + */ + { + const struct exception_table_entry *fixup; + + /* + * ERP points at the "break 14" + 2, compensate for the 2 + * bytes. + */ + fixup = search_exception_tables(instruction_pointer(regs) - 2); + if (fixup) { + /* Adjust the instruction pointer in the stackframe. */ + instruction_pointer(regs) = fixup->fixup; + arch_fixup(regs); + } + } +#else + /* Dont try to lookup the filename + line, just dump regs. */ + do_BUG("unknown", 0); +#endif +} + +/* + * Break 14 handler. Save regs and jump into the fixup_BUG. + */ +__asm__ ( ".text\n\t" + ".global breakh_BUG\n\t" + "breakh_BUG:\n\t" + SAVE_ALL + KGDB_FIXUP + "move.d $sp, $r10\n\t" + "jsr fixup_BUG\n\t" + "nop\n\t" + "jump ret_from_intr\n\t" + "nop\n\t"); + + +#ifdef CONFIG_DEBUG_BUGVERBOSE +void +handle_BUG(struct pt_regs *regs) +{ +} +#endif +#endif |