diff options
Diffstat (limited to 'arch/mips/kernel/setup.c')
| -rw-r--r-- | arch/mips/kernel/setup.c | 807 |
1 files changed, 807 insertions, 0 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c new file mode 100644 index 000000000..be73c4911 --- /dev/null +++ b/arch/mips/kernel/setup.c @@ -0,0 +1,807 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1995 Linus Torvalds + * Copyright (C) 1995 Waldorf Electronics + * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle + * Copyright (C) 1996 Stoned Elipot + * Copyright (C) 1999 Silicon Graphics, Inc. + * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki + */ +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/export.h> +#include <linux/screen_info.h> +#include <linux/memblock.h> +#include <linux/bootmem.h> +#include <linux/initrd.h> +#include <linux/root_dev.h> +#include <linux/highmem.h> +#include <linux/console.h> +#include <linux/pfn.h> +#include <linux/debugfs.h> +#include <linux/kexec.h> +#include <linux/sizes.h> +#include <linux/device.h> +#include <linux/dma-contiguous.h> + +#include <asm/addrspace.h> +#include <asm/bootinfo.h> +#include <asm/bugs.h> +#include <asm/cache.h> +#include <asm/cdmm.h> +#include <asm/cpu.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/smp-ops.h> +#include <asm/prom.h> + +struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; + +EXPORT_SYMBOL(cpu_data); + +#ifdef CONFIG_VT +struct screen_info screen_info; +#endif + +/* + * Despite it's name this variable is even if we don't have PCI + */ +unsigned int PCI_DMA_BUS_IS_PHYS; + +EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); + +/* + * Setup information + * + * These are initialized so they are in the .data section + */ +unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; + +EXPORT_SYMBOL(mips_machtype); + +struct boot_mem_map boot_mem_map; + +static char __initdata command_line[COMMAND_LINE_SIZE]; +char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; + +#ifdef CONFIG_CMDLINE_BOOL +static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; +#endif + +/* + * mips_io_port_base is the begin of the address space to which x86 style + * I/O ports are mapped. + */ +const unsigned long mips_io_port_base = -1; +EXPORT_SYMBOL(mips_io_port_base); + +static struct resource code_resource = { .name = "Kernel code", }; +static struct resource data_resource = { .name = "Kernel data", }; + +static void *detect_magic __initdata = detect_memory_region; + +void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) +{ + int x = boot_mem_map.nr_map; + int i; + + /* Sanity check */ + if (start + size < start) { + pr_warn("Trying to add an invalid memory region, skipped\n"); + return; + } + + /* + * Try to merge with existing entry, if any. + */ + for (i = 0; i < boot_mem_map.nr_map; i++) { + struct boot_mem_map_entry *entry = boot_mem_map.map + i; + unsigned long top; + + if (entry->type != type) + continue; + + if (start + size < entry->addr) + continue; /* no overlap */ + + if (entry->addr + entry->size < start) + continue; /* no overlap */ + + top = max(entry->addr + entry->size, start + size); + entry->addr = min(entry->addr, start); + entry->size = top - entry->addr; + + return; + } + + if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) { + pr_err("Ooops! Too many entries in the memory map!\n"); + return; + } + + boot_mem_map.map[x].addr = start; + boot_mem_map.map[x].size = size; + boot_mem_map.map[x].type = type; + boot_mem_map.nr_map++; +} + +void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) +{ + void *dm = &detect_magic; + phys_addr_t size; + + for (size = sz_min; size < sz_max; size <<= 1) { + if (!memcmp(dm, dm + size, sizeof(detect_magic))) + break; + } + + pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", + ((unsigned long long) size) / SZ_1M, + (unsigned long long) start, + ((unsigned long long) sz_min) / SZ_1M, + ((unsigned long long) sz_max) / SZ_1M); + + add_memory_region(start, size, BOOT_MEM_RAM); +} + +static void __init print_memory_map(void) +{ + int i; + const int field = 2 * sizeof(unsigned long); + + for (i = 0; i < boot_mem_map.nr_map; i++) { + printk(KERN_INFO " memory: %0*Lx @ %0*Lx ", + field, (unsigned long long) boot_mem_map.map[i].size, + field, (unsigned long long) boot_mem_map.map[i].addr); + + switch (boot_mem_map.map[i].type) { + case BOOT_MEM_RAM: + printk(KERN_CONT "(usable)\n"); + break; + case BOOT_MEM_INIT_RAM: + printk(KERN_CONT "(usable after init)\n"); + break; + case BOOT_MEM_ROM_DATA: + printk(KERN_CONT "(ROM data)\n"); + break; + case BOOT_MEM_RESERVED: + printk(KERN_CONT "(reserved)\n"); + break; + default: + printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type); + break; + } + } +} + +/* + * Manage initrd + */ +#ifdef CONFIG_BLK_DEV_INITRD + +static int __init rd_start_early(char *p) +{ + unsigned long start = memparse(p, &p); + +#ifdef CONFIG_64BIT + /* Guess if the sign extension was forgotten by bootloader */ + if (start < XKPHYS) + start = (int)start; +#endif + initrd_start = start; + initrd_end += start; + return 0; +} +early_param("rd_start", rd_start_early); + +static int __init rd_size_early(char *p) +{ + initrd_end += memparse(p, &p); + return 0; +} +early_param("rd_size", rd_size_early); + +/* it returns the next free pfn after initrd */ +static unsigned long __init init_initrd(void) +{ + unsigned long end; + + /* + * Board specific code or command line parser should have + * already set up initrd_start and initrd_end. In these cases + * perfom sanity checks and use them if all looks good. + */ + if (!initrd_start || initrd_end <= initrd_start) + goto disable; + + if (initrd_start & ~PAGE_MASK) { + pr_err("initrd start must be page aligned\n"); + goto disable; + } + if (initrd_start < PAGE_OFFSET) { + pr_err("initrd start < PAGE_OFFSET\n"); + goto disable; + } + + /* + * Sanitize initrd addresses. For example firmware + * can't guess if they need to pass them through + * 64-bits values if the kernel has been built in pure + * 32-bit. We need also to switch from KSEG0 to XKPHYS + * addresses now, so the code can now safely use __pa(). + */ + end = __pa(initrd_end); + initrd_end = (unsigned long)__va(end); + initrd_start = (unsigned long)__va(__pa(initrd_start)); + + ROOT_DEV = Root_RAM0; + return PFN_UP(end); +disable: + initrd_start = 0; + initrd_end = 0; + return 0; +} + +static void __init finalize_initrd(void) +{ + unsigned long size = initrd_end - initrd_start; + + if (size == 0) { + printk(KERN_INFO "Initrd not found or empty"); + goto disable; + } + if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { + printk(KERN_ERR "Initrd extends beyond end of memory"); + goto disable; + } + + reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT); + initrd_below_start_ok = 1; + + pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", + initrd_start, size); + return; +disable: + printk(KERN_CONT " - disabling initrd\n"); + initrd_start = 0; + initrd_end = 0; +} + +#else /* !CONFIG_BLK_DEV_INITRD */ + +static unsigned long __init init_initrd(void) +{ + return 0; +} + +#define finalize_initrd() do {} while (0) + +#endif + +/* + * Initialize the bootmem allocator. It also setup initrd related data + * if needed. + */ +#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) + +static void __init bootmem_init(void) +{ + init_initrd(); + finalize_initrd(); +} + +#else /* !CONFIG_SGI_IP27 */ + +static void __init bootmem_init(void) +{ + unsigned long reserved_end; + unsigned long mapstart = ~0UL; + unsigned long bootmap_size; + int i; + + /* + * Sanity check any INITRD first. We don't take it into account + * for bootmem setup initially, rely on the end-of-kernel-code + * as our memory range starting point. Once bootmem is inited we + * will reserve the area used for the initrd. + */ + init_initrd(); + reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end)); + + /* + * max_low_pfn is not a number of pages. The number of pages + * of the system is given by 'max_low_pfn - min_low_pfn'. + */ + min_low_pfn = ~0UL; + max_low_pfn = 0; + + /* + * Find the highest page frame number we have available. + */ + for (i = 0; i < boot_mem_map.nr_map; i++) { + unsigned long start, end; + + if (boot_mem_map.map[i].type != BOOT_MEM_RAM) + continue; + + start = PFN_UP(boot_mem_map.map[i].addr); + end = PFN_DOWN(boot_mem_map.map[i].addr + + boot_mem_map.map[i].size); + + if (end > max_low_pfn) + max_low_pfn = end; + if (start < min_low_pfn) + min_low_pfn = start; + if (end <= reserved_end) + continue; + if (start >= mapstart) + continue; + mapstart = max(reserved_end, start); + } + + if (min_low_pfn >= max_low_pfn) + panic("Incorrect memory mapping !!!"); + if (min_low_pfn > ARCH_PFN_OFFSET) { + pr_info("Wasting %lu bytes for tracking %lu unused pages\n", + (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page), + min_low_pfn - ARCH_PFN_OFFSET); + } else if (min_low_pfn < ARCH_PFN_OFFSET) { + pr_info("%lu free pages won't be used\n", + ARCH_PFN_OFFSET - min_low_pfn); + } + min_low_pfn = ARCH_PFN_OFFSET; + + /* + * Determine low and high memory ranges + */ + max_pfn = max_low_pfn; + if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) { +#ifdef CONFIG_HIGHMEM + highstart_pfn = PFN_DOWN(HIGHMEM_START); + highend_pfn = max_low_pfn; +#endif + max_low_pfn = PFN_DOWN(HIGHMEM_START); + } + +#ifdef CONFIG_BLK_DEV_INITRD + /* + * mapstart should be after initrd_end + */ + if (initrd_end) + mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end))); +#endif + + /* + * Initialize the boot-time allocator with low memory only. + */ + bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart, + min_low_pfn, max_low_pfn); + + + for (i = 0; i < boot_mem_map.nr_map; i++) { + unsigned long start, end; + + start = PFN_UP(boot_mem_map.map[i].addr); + end = PFN_DOWN(boot_mem_map.map[i].addr + + boot_mem_map.map[i].size); + + if (start <= min_low_pfn) + start = min_low_pfn; + if (start >= end) + continue; + +#ifndef CONFIG_HIGHMEM + if (end > max_low_pfn) + end = max_low_pfn; + + /* + * ... finally, is the area going away? + */ + if (end <= start) + continue; +#endif + + memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0); + } + + /* + * Register fully available low RAM pages with the bootmem allocator. + */ + for (i = 0; i < boot_mem_map.nr_map; i++) { + unsigned long start, end, size; + + start = PFN_UP(boot_mem_map.map[i].addr); + end = PFN_DOWN(boot_mem_map.map[i].addr + + boot_mem_map.map[i].size); + + /* + * Reserve usable memory. + */ + switch (boot_mem_map.map[i].type) { + case BOOT_MEM_RAM: + break; + case BOOT_MEM_INIT_RAM: + memory_present(0, start, end); + continue; + default: + /* Not usable memory */ + continue; + } + + /* + * We are rounding up the start address of usable memory + * and at the end of the usable range downwards. + */ + if (start >= max_low_pfn) + continue; + if (start < reserved_end) + start = reserved_end; + if (end > max_low_pfn) + end = max_low_pfn; + + /* + * ... finally, is the area going away? + */ + if (end <= start) + continue; + size = end - start; + + /* Register lowmem ranges */ + free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT); + memory_present(0, start, end); + } + + /* + * Reserve the bootmap memory. + */ + reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT); + + /* + * Reserve initrd memory if needed. + */ + finalize_initrd(); +} + +#endif /* CONFIG_SGI_IP27 */ + +/* + * arch_mem_init - initialize memory management subsystem + * + * o plat_mem_setup() detects the memory configuration and will record detected + * memory areas using add_memory_region. + * + * At this stage the memory configuration of the system is known to the + * kernel but generic memory management system is still entirely uninitialized. + * + * o bootmem_init() + * o sparse_init() + * o paging_init() + * o dma_continguous_reserve() + * + * At this stage the bootmem allocator is ready to use. + * + * NOTE: historically plat_mem_setup did the entire platform initialization. + * This was rather impractical because it meant plat_mem_setup had to + * get away without any kind of memory allocator. To keep old code from + * breaking plat_setup was just renamed to plat_mem_setup and a second platform + * initialization hook for anything else was introduced. + */ + +static int usermem __initdata; + +static int __init early_parse_mem(char *p) +{ + phys_addr_t start, size; + + /* + * If a user specifies memory size, we + * blow away any automatically generated + * size. + */ + if (usermem == 0) { + boot_mem_map.nr_map = 0; + usermem = 1; + } + start = 0; + size = memparse(p, &p); + if (*p == '@') + start = memparse(p + 1, &p); + + add_memory_region(start, size, BOOT_MEM_RAM); + return 0; +} +early_param("mem", early_parse_mem); + +#ifdef CONFIG_PROC_VMCORE +unsigned long setup_elfcorehdr, setup_elfcorehdr_size; +static int __init early_parse_elfcorehdr(char *p) +{ + int i; + + setup_elfcorehdr = memparse(p, &p); + + for (i = 0; i < boot_mem_map.nr_map; i++) { + unsigned long start = boot_mem_map.map[i].addr; + unsigned long end = (boot_mem_map.map[i].addr + + boot_mem_map.map[i].size); + if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { + /* + * Reserve from the elf core header to the end of + * the memory segment, that should all be kdump + * reserved memory. + */ + setup_elfcorehdr_size = end - setup_elfcorehdr; + break; + } + } + /* + * If we don't find it in the memory map, then we shouldn't + * have to worry about it, as the new kernel won't use it. + */ + return 0; +} +early_param("elfcorehdr", early_parse_elfcorehdr); +#endif + +static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type) +{ + phys_addr_t size; + int i; + + size = end - mem; + if (!size) + return; + + /* Make sure it is in the boot_mem_map */ + for (i = 0; i < boot_mem_map.nr_map; i++) { + if (mem >= boot_mem_map.map[i].addr && + mem < (boot_mem_map.map[i].addr + + boot_mem_map.map[i].size)) + return; + } + add_memory_region(mem, size, type); +} + +#ifdef CONFIG_KEXEC +static inline unsigned long long get_total_mem(void) +{ + unsigned long long total; + + total = max_pfn - min_low_pfn; + return total << PAGE_SHIFT; +} + +static void __init mips_parse_crashkernel(void) +{ + unsigned long long total_mem; + unsigned long long crash_size, crash_base; + int ret; + + total_mem = get_total_mem(); + ret = parse_crashkernel(boot_command_line, total_mem, + &crash_size, &crash_base); + if (ret != 0 || crash_size <= 0) + return; + + crashk_res.start = crash_base; + crashk_res.end = crash_base + crash_size - 1; +} + +static void __init request_crashkernel(struct resource *res) +{ + int ret; + + ret = request_resource(res, &crashk_res); + if (!ret) + pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", + (unsigned long)((crashk_res.end - + crashk_res.start + 1) >> 20), + (unsigned long)(crashk_res.start >> 20)); +} +#else /* !defined(CONFIG_KEXEC) */ +static void __init mips_parse_crashkernel(void) +{ +} + +static void __init request_crashkernel(struct resource *res) +{ +} +#endif /* !defined(CONFIG_KEXEC) */ + +static void __init arch_mem_init(char **cmdline_p) +{ + struct memblock_region *reg; + extern void plat_mem_setup(void); + + /* call board setup routine */ + plat_mem_setup(); + + /* + * Make sure all kernel memory is in the maps. The "UP" and + * "DOWN" are opposite for initdata since if it crosses over + * into another memory section you don't want that to be + * freed when the initdata is freed. + */ + arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT, + PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT, + BOOT_MEM_RAM); + arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT, + PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT, + BOOT_MEM_INIT_RAM); + + pr_info("Determined physical RAM map:\n"); + print_memory_map(); + +#ifdef CONFIG_CMDLINE_BOOL +#ifdef CONFIG_CMDLINE_OVERRIDE + strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); +#else + if (builtin_cmdline[0]) { + strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE); + strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE); + } + strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); +#endif +#else + strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); +#endif + strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); + + *cmdline_p = command_line; + + parse_early_param(); + + if (usermem) { + pr_info("User-defined physical RAM map:\n"); + print_memory_map(); + } + + bootmem_init(); +#ifdef CONFIG_PROC_VMCORE + if (setup_elfcorehdr && setup_elfcorehdr_size) { + printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", + setup_elfcorehdr, setup_elfcorehdr_size); + reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size, + BOOTMEM_DEFAULT); + } +#endif + + mips_parse_crashkernel(); +#ifdef CONFIG_KEXEC + if (crashk_res.start != crashk_res.end) + reserve_bootmem(crashk_res.start, + crashk_res.end - crashk_res.start + 1, + BOOTMEM_DEFAULT); +#endif + device_tree_init(); + sparse_init(); + plat_swiotlb_setup(); + paging_init(); + + dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); + /* Tell bootmem about cma reserved memblock section */ + for_each_memblock(reserved, reg) + if (reg->size != 0) + reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); +} + +static void __init resource_init(void) +{ + int i; + + if (UNCAC_BASE != IO_BASE) + return; + + code_resource.start = __pa_symbol(&_text); + code_resource.end = __pa_symbol(&_etext) - 1; + data_resource.start = __pa_symbol(&_etext); + data_resource.end = __pa_symbol(&_edata) - 1; + + for (i = 0; i < boot_mem_map.nr_map; i++) { + struct resource *res; + unsigned long start, end; + + start = boot_mem_map.map[i].addr; + end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; + if (start >= HIGHMEM_START) + continue; + if (end >= HIGHMEM_START) + end = HIGHMEM_START - 1; + + res = alloc_bootmem(sizeof(struct resource)); + switch (boot_mem_map.map[i].type) { + case BOOT_MEM_RAM: + case BOOT_MEM_INIT_RAM: + case BOOT_MEM_ROM_DATA: + res->name = "System RAM"; + break; + case BOOT_MEM_RESERVED: + default: + res->name = "reserved"; + } + + res->start = start; + res->end = end; + + res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; + request_resource(&iomem_resource, res); + + /* + * We don't know which RAM region contains kernel data, + * so we try it repeatedly and let the resource manager + * test it. + */ + request_resource(res, &code_resource); + request_resource(res, &data_resource); + request_crashkernel(res); + } +} + +#ifdef CONFIG_SMP +static void __init prefill_possible_map(void) +{ + int i, possible = num_possible_cpus(); + + if (possible > nr_cpu_ids) + possible = nr_cpu_ids; + + for (i = 0; i < possible; i++) + set_cpu_possible(i, true); + for (; i < NR_CPUS; i++) + set_cpu_possible(i, false); + + nr_cpu_ids = possible; +} +#else +static inline void prefill_possible_map(void) {} +#endif + +void __init setup_arch(char **cmdline_p) +{ + cpu_probe(); + prom_init(); + + setup_early_fdc_console(); +#ifdef CONFIG_EARLY_PRINTK + setup_early_printk(); +#endif + cpu_report(); + check_bugs_early(); + +#if defined(CONFIG_VT) +#if defined(CONFIG_VGA_CONSOLE) + conswitchp = &vga_con; +#elif defined(CONFIG_DUMMY_CONSOLE) + conswitchp = &dummy_con; +#endif +#endif + + arch_mem_init(cmdline_p); + + resource_init(); + plat_smp_setup(); + prefill_possible_map(); + + cpu_cache_init(); +} + +unsigned long kernelsp[NR_CPUS]; +unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; + +#ifdef CONFIG_DEBUG_FS +struct dentry *mips_debugfs_dir; +static int __init debugfs_mips(void) +{ + struct dentry *d; + + d = debugfs_create_dir("mips", NULL); + if (!d) + return -ENOMEM; + mips_debugfs_dir = d; + return 0; +} +arch_initcall(debugfs_mips); +#endif |