Initial import

1 files changed, 281 insertions, 0 deletions

diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
new file mode 100644
index 000000000..5d40aeb77
--- /dev/null
+++ b/arch/frv/kernel/process.c
@@ -0,0 +1,281 @@
+/* process.c: FRV specific parts of process handling
+ *
+ * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from arch/m68k/kernel/process.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/elf.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/pagemap.h>
+#include <linux/rcupdate.h>
+
+#include <asm/asm-offsets.h>
+#include <asm/uaccess.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+#include <asm/tlb.h>
+#include <asm/gdb-stub.h>
+#include <asm/mb-regs.h>
+
+#include "local.h"
+
+asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
+
+#include <asm/pgalloc.h>
+
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+static void core_sleep_idle(void)
+{
+#ifdef LED_DEBUG_SLEEP
+	/* Show that we're sleeping... */
+	__set_LEDS(0x55aa);
+#endif
+	frv_cpu_core_sleep();
+#ifdef LED_DEBUG_SLEEP
+	/* ... and that we woke up */
+	__set_LEDS(0);
+#endif
+	mb();
+}
+
+void arch_cpu_idle(void)
+{
+	if (!frv_dma_inprogress)
+		core_sleep_idle();
+	else
+		local_irq_enable();
+}
+
+void machine_restart(char * __unused)
+{
+	unsigned long reset_addr;
+#ifdef CONFIG_GDBSTUB
+	gdbstub_exit(0);
+#endif
+
+	if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
+		reset_addr = 0xfefff500;
+	else
+		reset_addr = 0xfeff0500;
+
+	/* Software reset. */
+	asm volatile("      dcef @(gr0,gr0),1 ! membar !"
+		     "      sti     %1,@(%0,0) !"
+		     "      nop ! nop ! nop ! nop ! nop ! "
+		     "      nop ! nop ! nop ! nop ! nop ! "
+		     "      nop ! nop ! nop ! nop ! nop ! "
+		     "      nop ! nop ! nop ! nop ! nop ! "
+		     : : "r" (reset_addr), "r" (1) );
+
+	for (;;)
+		;
+}
+
+void machine_halt(void)
+{
+#ifdef CONFIG_GDBSTUB
+	gdbstub_exit(0);
+#endif
+
+	for (;;);
+}
+
+void machine_power_off(void)
+{
+#ifdef CONFIG_GDBSTUB
+	gdbstub_exit(0);
+#endif
+
+	for (;;);
+}
+
+void flush_thread(void)
+{
+	/* nothing */
+}
+
+inline unsigned long user_stack(const struct pt_regs *regs)
+{
+	while (regs->next_frame)
+		regs = regs->next_frame;
+	return user_mode(regs) ? regs->sp : 0;
+}
+
+/*
+ * set up the kernel stack and exception frames for a new process
+ */
+int copy_thread(unsigned long clone_flags,
+		unsigned long usp, unsigned long arg,
+		struct task_struct *p)
+{
+	struct pt_regs *childregs;
+
+	childregs = (struct pt_regs *)
+		(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
+
+	/* set up the userspace frame (the only place that the USP is stored) */
+	*childregs = *current_pt_regs();
+
+	p->thread.frame	 = childregs;
+	p->thread.curr	 = p;
+	p->thread.sp	 = (unsigned long) childregs;
+	p->thread.fp	 = 0;
+	p->thread.lr	 = 0;
+	p->thread.frame0 = childregs;
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		childregs->gr9 = usp; /* function */
+		childregs->gr8 = arg;
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+		save_user_regs(p->thread.user);
+		return 0;
+	}
+	if (usp)
+		childregs->sp = usp;
+	childregs->next_frame	= NULL;
+
+	p->thread.pc = (unsigned long) ret_from_fork;
+
+	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
+	if (clone_flags & CLONE_SETTLS)
+		childregs->gr29 = childregs->gr12;
+
+	save_user_regs(p->thread.user);
+
+	return 0;
+} /* end copy_thread() */
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	struct pt_regs *regs0;
+	unsigned long fp, pc;
+	unsigned long stack_limit;
+	int count = 0;
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	stack_limit = (unsigned long) (p + 1);
+	fp = p->thread.fp;
+	regs0 = p->thread.frame0;
+
+	do {
+		if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
+			return 0;
+
+		pc = ((unsigned long *) fp)[2];
+
+		/* FIXME: This depends on the order of these functions. */
+		if (!in_sched_functions(pc))
+			return pc;
+
+		fp = *(unsigned long *) fp;
+	} while (count++ < 16);
+
+	return 0;
+}
+
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+	/* Check whether the thread is blocked in resume() */
+	if (in_sched_functions(tsk->thread.pc))
+		return ((unsigned long *)tsk->thread.fp)[2];
+	else
+		return tsk->thread.pc;
+}
+
+int elf_check_arch(const struct elf32_hdr *hdr)
+{
+	unsigned long hsr0 = __get_HSR(0);
+	unsigned long psr = __get_PSR();
+
+	if (hdr->e_machine != EM_FRV)
+		return 0;
+
+	switch (hdr->e_flags & EF_FRV_GPR_MASK) {
+	case EF_FRV_GPR64:
+		if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
+			return 0;
+	case EF_FRV_GPR32:
+	case 0:
+		break;
+	default:
+		return 0;
+	}
+
+	switch (hdr->e_flags & EF_FRV_FPR_MASK) {
+	case EF_FRV_FPR64:
+		if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
+			return 0;
+	case EF_FRV_FPR32:
+	case EF_FRV_FPR_NONE:
+	case 0:
+		break;
+	default:
+		return 0;
+	}
+
+	if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
+		if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
+		    PSR_IMPLE(psr) != PSR_IMPLE_FR451)
+			return 0;
+
+	switch (hdr->e_flags & EF_FRV_CPU_MASK) {
+	case EF_FRV_CPU_GENERIC:
+		break;
+	case EF_FRV_CPU_FR300:
+	case EF_FRV_CPU_SIMPLE:
+	case EF_FRV_CPU_TOMCAT:
+	default:
+		return 0;
+	case EF_FRV_CPU_FR400:
+		if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
+		    PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
+		    PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
+		    PSR_IMPLE(psr) != PSR_IMPLE_FR551)
+			return 0;
+		break;
+	case EF_FRV_CPU_FR450:
+		if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
+			return 0;
+		break;
+	case EF_FRV_CPU_FR500:
+		if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
+			return 0;
+		break;
+	case EF_FRV_CPU_FR550:
+		if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
+			return 0;
+		break;
+	}
+
+	return 1;
+}
+
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
+{
+	memcpy(fpregs,
+	       &current->thread.user->f,
+	       sizeof(current->thread.user->f));
+	return 1;
+}