setup.c
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上传日期:2013-02-24
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文件大小:19k
- /*
- * linux/arch/arm/kernel/setup.c
- *
- * Copyright (C) 1995-2001 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/stddef.h>
- #include <linux/ioport.h>
- #include <linux/delay.h>
- #include <linux/utsname.h>
- #include <linux/blk.h>
- #include <linux/console.h>
- #include <linux/bootmem.h>
- #include <linux/seq_file.h>
- #include <linux/init.h>
- #include <asm/elf.h>
- #include <asm/hardware.h>
- #include <asm/io.h>
- #include <asm/procinfo.h>
- #include <asm/setup.h>
- #include <asm/mach-types.h>
- #include <asm/mach/arch.h>
- #include <asm/mach/irq.h>
- #ifndef MEM_SIZE
- #define MEM_SIZE (16*1024*1024)
- #endif
- #ifndef CONFIG_CMDLINE
- #define CONFIG_CMDLINE ""
- #endif
- #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
- char fpe_type[8];
- static int __init fpe_setup(char *line)
- {
- memcpy(fpe_type, line, 8);
- return 1;
- }
- __setup("fpe=", fpe_setup);
- #endif
- extern unsigned int mem_fclk_21285;
- extern void paging_init(struct meminfo *, struct machine_desc *desc);
- extern void convert_to_tag_list(struct param_struct *params, int mem_init);
- extern void bootmem_init(struct meminfo *);
- extern void reboot_setup(char *str);
- extern int root_mountflags;
- extern int _stext, _text, _etext, _edata, _end;
- unsigned int processor_id;
- unsigned int __machine_arch_type;
- unsigned int system_rev;
- unsigned int system_serial_low;
- unsigned int system_serial_high;
- unsigned int elf_hwcap;
- #ifdef MULTI_CPU
- struct processor processor;
- #endif
- unsigned char aux_device_present;
- char elf_platform[ELF_PLATFORM_SIZE];
- char saved_command_line[COMMAND_LINE_SIZE];
- static struct meminfo meminfo __initdata = { 0, };
- static struct proc_info_item proc_info;
- static const char *machine_name;
- static char command_line[COMMAND_LINE_SIZE];
- static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
- static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
- #define ENDIANNESS ((char)endian_test.l)
- /*
- * Standard memory resources
- */
- static struct resource mem_res[] = {
- { "Video RAM", 0, 0, IORESOURCE_MEM },
- { "Kernel code", 0, 0, IORESOURCE_MEM },
- { "Kernel data", 0, 0, IORESOURCE_MEM }
- };
- #define video_ram mem_res[0]
- #define kernel_code mem_res[1]
- #define kernel_data mem_res[2]
- static struct resource io_res[] = {
- { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
- { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
- { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
- };
- #define lp0 io_res[0]
- #define lp1 io_res[1]
- #define lp2 io_res[2]
- #ifdef CONFIG_CPU_32
- static const char *cache_types[16] = {
- "write-through",
- "write-back",
- "write-back",
- "undefined 3",
- "undefined 4",
- "undefined 5",
- "write-back",
- "write-back",
- "undefined 8",
- "undefined 9",
- "undefined 10",
- "undefined 11",
- "undefined 12",
- "undefined 13",
- "undefined 14",
- "undefined 15",
- };
- static const char *cache_clean[16] = {
- "not required",
- "read-block",
- "cp15 c7 ops",
- "undefined 3",
- "undefined 4",
- "undefined 5",
- "cp15 c7 ops",
- "cp15 c7 ops",
- "undefined 8",
- "undefined 9",
- "undefined 10",
- "undefined 11",
- "undefined 12",
- "undefined 13",
- "undefined 14",
- "undefined 15",
- };
- static const char *cache_lockdown[16] = {
- "not supported",
- "not supported",
- "not supported",
- "undefined 3",
- "undefined 4",
- "undefined 5",
- "format A",
- "format B",
- "undefined 8",
- "undefined 9",
- "undefined 10",
- "undefined 11",
- "undefined 12",
- "undefined 13",
- "undefined 14",
- "undefined 15",
- };
- #define CACHE_TYPE(x) (((x) >> 25) & 15)
- #define CACHE_S(x) ((x) & (1 << 24))
- #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
- #define CACHE_ISIZE(x) ((x) & 4095)
- #define CACHE_SIZE(y) (((y) >> 6) & 7)
- #define CACHE_ASSOC(y) (((y) >> 3) & 7)
- #define CACHE_M(y) ((y) & (1 << 2))
- #define CACHE_LINE(y) ((y) & 3)
- static inline void dump_cache(const char *prefix, unsigned int cache)
- {
- unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
- printk("%s size %dK associativity %d line length %d sets %dn",
- prefix,
- mult << (8 + CACHE_SIZE(cache)),
- (mult << CACHE_ASSOC(cache)) >> 1,
- 8 << CACHE_LINE(cache),
- 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
- CACHE_LINE(cache)));
- }
- static inline void dump_cpu_cache_id(void)
- {
- unsigned int cache_info;
- asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (cache_info));
- if (cache_info == processor_id)
- return;
- printk("CPU: D %s cachen", cache_types[CACHE_TYPE(cache_info)]);
- if (CACHE_S(cache_info)) {
- dump_cache("CPU: I cache", CACHE_ISIZE(cache_info));
- dump_cache("CPU: D cache", CACHE_DSIZE(cache_info));
- } else {
- dump_cache("CPU: cache", CACHE_ISIZE(cache_info));
- }
- }
- #else
- #define dump_cpu_cache_id() do { } while (0)
- #endif
- static void __init setup_processor(void)
- {
- extern struct proc_info_list __proc_info_begin, __proc_info_end;
- struct proc_info_list *list;
- /*
- * locate processor in the list of supported processor
- * types. The linker builds this table for us from the
- * entries in arch/arm/mm/proc-*.S
- */
- for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
- if ((processor_id & list->cpu_mask) == list->cpu_val)
- break;
- /*
- * If processor type is unrecognised, then we
- * can do nothing...
- */
- if (list >= &__proc_info_end) {
- printk("CPU configuration botched (ID %08x), unable "
- "to continue.n", processor_id);
- while (1);
- }
- proc_info = *list->info;
- #ifdef MULTI_CPU
- processor = *list->proc;
- #endif
- printk("CPU: %s %s revision %dn",
- proc_info.manufacturer, proc_info.cpu_name,
- (int)processor_id & 15);
- sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
- sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
- elf_hwcap = list->elf_hwcap;
- cpu_proc_init();
- }
- static struct machine_desc * __init setup_machine(unsigned int nr)
- {
- extern struct machine_desc __arch_info_begin, __arch_info_end;
- struct machine_desc *list;
- /*
- * locate architecture in the list of supported architectures.
- */
- for (list = &__arch_info_begin; list < &__arch_info_end; list++)
- if (list->nr == nr)
- break;
- /*
- * If the architecture type is not recognised, then we
- * can co nothing...
- */
- if (list >= &__arch_info_end) {
- printk("Architecture configuration botched (nr %d), unable "
- "to continue.n", nr);
- while (1);
- }
- printk("Machine: %sn", list->name);
- return list;
- }
- /*
- * Initial parsing of the command line. We need to pick out the
- * memory size. We look for mem=size@start, where start and size
- * are "size[KkMm]"
- */
- static void __init
- parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
- {
- char c = ' ', *to = command_line;
- int usermem = 0, len = 0;
- for (;;) {
- if (c == ' ' && !memcmp(from, "mem=", 4)) {
- unsigned long size, start;
- if (to != command_line)
- to -= 1;
- /*
- * If the user specifies memory size, we
- * blow away any automatically generated
- * size.
- */
- if (usermem == 0) {
- usermem = 1;
- mi->nr_banks = 0;
- }
- start = PHYS_OFFSET;
- size = memparse(from + 4, &from);
- if (*from == '@')
- start = memparse(from + 1, &from);
- mi->bank[mi->nr_banks].start = start;
- mi->bank[mi->nr_banks].size = size;
- mi->bank[mi->nr_banks].node = PHYS_TO_NID(start);
- mi->nr_banks += 1;
- }
- c = *from++;
- if (!c)
- break;
- if (COMMAND_LINE_SIZE <= ++len)
- break;
- *to++ = c;
- }
- *to = ' ';
- *cmdline_p = command_line;
- }
- void __init
- setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
- {
- #ifdef CONFIG_BLK_DEV_RAM
- extern int rd_size;
- rd_image_start = image_start;
- rd_prompt = prompt;
- rd_doload = doload;
- if (rd_sz)
- rd_size = rd_sz;
- #endif
- }
- /*
- * initial ram disk
- */
- void __init setup_initrd(unsigned int start, unsigned int size)
- {
- #ifdef CONFIG_BLK_DEV_INITRD
- if (start == 0)
- size = 0;
- initrd_start = start;
- initrd_end = start + size;
- #endif
- }
- static void __init
- request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
- {
- struct resource *res;
- int i;
- kernel_code.start = __virt_to_phys(init_mm.start_code);
- kernel_code.end = __virt_to_phys(init_mm.end_code - 1);
- kernel_data.start = __virt_to_phys(init_mm.end_code);
- kernel_data.end = __virt_to_phys(init_mm.brk - 1);
- for (i = 0; i < mi->nr_banks; i++) {
- unsigned long virt_start, virt_end;
- if (mi->bank[i].size == 0)
- continue;
- virt_start = __phys_to_virt(mi->bank[i].start);
- virt_end = virt_start + mi->bank[i].size - 1;
- res = alloc_bootmem_low(sizeof(*res));
- res->name = "System RAM";
- res->start = __virt_to_phys(virt_start);
- res->end = __virt_to_phys(virt_end);
- res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- request_resource(&iomem_resource, res);
- if (kernel_code.start >= res->start &&
- kernel_code.end <= res->end)
- request_resource(res, &kernel_code);
- if (kernel_data.start >= res->start &&
- kernel_data.end <= res->end)
- request_resource(res, &kernel_data);
- }
- if (mdesc->video_start) {
- video_ram.start = mdesc->video_start;
- video_ram.end = mdesc->video_end;
- request_resource(&iomem_resource, &video_ram);
- }
- /*
- * Some machines don't have the possibility of ever
- * possessing lp0, lp1 or lp2
- */
- if (mdesc->reserve_lp0)
- request_resource(&ioport_resource, &lp0);
- if (mdesc->reserve_lp1)
- request_resource(&ioport_resource, &lp1);
- if (mdesc->reserve_lp2)
- request_resource(&ioport_resource, &lp2);
- }
- /*
- * Tag parsing.
- *
- * This is the new way of passing data to the kernel at boot time. Rather
- * than passing a fixed inflexible structure to the kernel, we pass a list
- * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
- * tag for the list to be recognised (to distinguish the tagged list from
- * a param_struct). The list is terminated with a zero-length tag (this tag
- * is not parsed in any way).
- */
- static int __init parse_tag_core(const struct tag *tag)
- {
- if (tag->hdr.size > 2) {
- if ((tag->u.core.flags & 1) == 0)
- root_mountflags &= ~MS_RDONLY;
- ROOT_DEV = to_kdev_t(tag->u.core.rootdev);
- }
- return 0;
- }
- __tagtable(ATAG_CORE, parse_tag_core);
- static int __init parse_tag_mem32(const struct tag *tag)
- {
- if (meminfo.nr_banks >= NR_BANKS) {
- printk(KERN_WARNING
- "Ignoring memory bank 0x%08x size %dKBn",
- tag->u.mem.start, tag->u.mem.size / 1024);
- return -EINVAL;
- }
- meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
- meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size;
- meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start);
- meminfo.nr_banks += 1;
- return 0;
- }
- __tagtable(ATAG_MEM, parse_tag_mem32);
- #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
- struct screen_info screen_info = {
- orig_video_lines: 30,
- orig_video_cols: 80,
- orig_video_mode: 0,
- orig_video_ega_bx: 0,
- orig_video_isVGA: 1,
- orig_video_points: 8
- };
- static int __init parse_tag_videotext(const struct tag *tag)
- {
- screen_info.orig_x = tag->u.videotext.x;
- screen_info.orig_y = tag->u.videotext.y;
- screen_info.orig_video_page = tag->u.videotext.video_page;
- screen_info.orig_video_mode = tag->u.videotext.video_mode;
- screen_info.orig_video_cols = tag->u.videotext.video_cols;
- screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
- screen_info.orig_video_lines = tag->u.videotext.video_lines;
- screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
- screen_info.orig_video_points = tag->u.videotext.video_points;
- return 0;
- }
- __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
- #endif
- static int __init parse_tag_ramdisk(const struct tag *tag)
- {
- setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
- (tag->u.ramdisk.flags & 2) == 0,
- tag->u.ramdisk.start, tag->u.ramdisk.size);
- return 0;
- }
- __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
- static int __init parse_tag_initrd(const struct tag *tag)
- {
- setup_initrd(tag->u.initrd.start, tag->u.initrd.size);
- return 0;
- }
- __tagtable(ATAG_INITRD, parse_tag_initrd);
- static int __init parse_tag_initrd2(const struct tag *tag)
- {
- unsigned long start = 0;
- if (tag->u.initrd.size) {
- start = (unsigned long)phys_to_virt(tag->u.initrd.start);
- setup_initrd(start, tag->u.initrd.size);
- }
- return 0;
- }
- __tagtable(ATAG_INITRD2, parse_tag_initrd2);
- static int __init parse_tag_serialnr(const struct tag *tag)
- {
- system_serial_low = tag->u.serialnr.low;
- system_serial_high = tag->u.serialnr.high;
- return 0;
- }
- __tagtable(ATAG_SERIAL, parse_tag_serialnr);
- static int __init parse_tag_revision(const struct tag *tag)
- {
- system_rev = tag->u.revision.rev;
- return 0;
- }
- __tagtable(ATAG_REVISION, parse_tag_revision);
- static int __init parse_tag_cmdline(const struct tag *tag)
- {
- #ifndef CONFIG_NO_TAG_CMDLINE
- strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
- #endif
- default_command_line[COMMAND_LINE_SIZE - 1] = ' ';
- return 0;
- }
- __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
- /*
- * Scan the tag table for this tag, and call its parse function.
- * The tag table is built by the linker from all the __tagtable
- * declarations.
- */
- static int __init parse_tag(const struct tag *tag)
- {
- extern struct tagtable __tagtable_begin, __tagtable_end;
- struct tagtable *t;
- for (t = &__tagtable_begin; t < &__tagtable_end; t++)
- if (tag->hdr.tag == t->tag) {
- t->parse(tag);
- break;
- }
- return t < &__tagtable_end;
- }
- /*
- * Parse all tags in the list, checking both the global and architecture
- * specific tag tables.
- */
- static void __init parse_tags(const struct tag *t)
- {
- for (; t->hdr.size; t = tag_next(t))
- if (!parse_tag(t))
- printk(KERN_WARNING
- "Ignoring unrecognised tag 0x%08xn",
- t->hdr.tag);
- }
- void __init setup_arch(char **cmdline_p)
- {
- struct tag *tags = NULL;
- struct machine_desc *mdesc;
- char *from = default_command_line;
- ROOT_DEV = MKDEV(0, 255);
- setup_processor();
- mdesc = setup_machine(machine_arch_type);
- machine_name = mdesc->name;
- if (mdesc->soft_reboot)
- reboot_setup("s");
- if (mdesc->param_offset)
- tags = phys_to_virt(mdesc->param_offset);
- /*
- * Do the machine-specific fixups before we parse the
- * parameters or tags.
- */
- if (mdesc->fixup)
- mdesc->fixup(mdesc, (struct param_struct *)tags,
- &from, &meminfo);
- /*
- * If we have the old style parameters, convert them to
- * a tag list before.
- */
- if (tags && tags->hdr.tag != ATAG_CORE)
- convert_to_tag_list((struct param_struct *)tags,
- meminfo.nr_banks == 0);
- if (tags && tags->hdr.tag == ATAG_CORE)
- parse_tags(tags);
- if (meminfo.nr_banks == 0) {
- meminfo.nr_banks = 1;
- meminfo.bank[0].start = PHYS_OFFSET;
- meminfo.bank[0].size = MEM_SIZE;
- }
- init_mm.start_code = (unsigned long) &_text;
- init_mm.end_code = (unsigned long) &_etext;
- init_mm.end_data = (unsigned long) &_edata;
- init_mm.brk = (unsigned long) &_end;
- memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
- saved_command_line[COMMAND_LINE_SIZE-1] = ' ';
- parse_cmdline(&meminfo, cmdline_p, from);
- bootmem_init(&meminfo);
- paging_init(&meminfo, mdesc);
- request_standard_resources(&meminfo, mdesc);
- /*
- * Set up various architecture-specific pointers
- */
- init_arch_irq = mdesc->init_irq;
- #ifdef CONFIG_VT
- #if defined(CONFIG_VGA_CONSOLE)
- conswitchp = &vga_con;
- #elif defined(CONFIG_DUMMY_CONSOLE)
- conswitchp = &dummy_con;
- #endif
- #endif
- }
- static const char *hwcap_str[] = {
- "swp",
- "half",
- "thumb",
- "26bit",
- "fastmult",
- "fpa",
- "vfp",
- "edsp",
- NULL
- };
- static const char *proc_arch[16] = {
- "undefined 0",
- "4",
- "4T",
- "5",
- "5T",
- "5TE",
- "undefined 6",
- "undefined 7",
- "undefined 8",
- "undefined 9",
- "undefined 10",
- "undefined 11",
- "undefined 12",
- "undefined 13",
- "undefined 14",
- "undefined 15"
- };
- static void
- c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
- {
- unsigned int mult = 2 + CACHE_M(cache) ? 1 : 0;
- seq_printf(m, "%s sizett: %dn"
- "%s assoctt: %dn"
- "%s line lengtht: %dn"
- "%s setstt: %dn",
- type, mult << (8 + CACHE_SIZE(cache)),
- type, (mult << CACHE_ASSOC(cache)) >> 1,
- type, 8 << CACHE_LINE(cache),
- type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
- CACHE_LINE(cache)));
- }
- static int c_show(struct seq_file *m, void *v)
- {
- int i;
- seq_printf(m, "Processort: %s %s rev %d (%s)n",
- proc_info.manufacturer, proc_info.cpu_name,
- (int)processor_id & 15, elf_platform);
- seq_printf(m, "BogoMIPSt: %lu.%02lun",
- loops_per_jiffy / (500000/HZ),
- (loops_per_jiffy / (5000/HZ)) % 100);
- /* dump out the processor features */
- seq_puts(m, "Featurest: ");
- for (i = 0; hwcap_str[i]; i++)
- if (elf_hwcap & (1 << i))
- seq_printf(m, "%s ", hwcap_str[i]);
- seq_puts(m, "n");
- if ((processor_id & 0x0000f000) == 0x00000000) {
- /* pre-ARM7 */
- seq_printf(m, "CPU parttt: %07xn", processor_id >> 4);
- } else if ((processor_id & 0x0000f000) == 0x00007000) {
- /* ARM7 */
- seq_printf(m, "CPU implementort: 0x%02xn"
- "CPU architecture: %sn"
- "CPU variantt: 0x%02xn"
- "CPU partt: 0x%03xn",
- processor_id >> 24,
- processor_id & (1 << 23) ? "4T" : "3",
- (processor_id >> 16) & 127,
- (processor_id >> 4) & 0xfff);
- } else {
- /* post-ARM7 */
- seq_printf(m, "CPU implementort: 0x%02xn"
- "CPU architecture: %sn"
- "CPU variantt: 0x%xn"
- "CPU partt: 0x%03xn",
- processor_id >> 24,
- proc_arch[(processor_id >> 16) & 15],
- (processor_id >> 20) & 15,
- (processor_id >> 4) & 0xfff);
- }
- seq_printf(m, "CPU revisiont: %dn", processor_id & 15);
- #ifdef CONFIG_CPU_32
- {
- unsigned int cache_info;
- asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (cache_info));
- if (cache_info != processor_id) {
- seq_printf(m, "Cache typet: %sn"
- "Cache cleant: %sn"
- "Cache lockdownt: %sn"
- "Cache unifiedt: %sn",
- cache_types[CACHE_TYPE(cache_info)],
- cache_clean[CACHE_TYPE(cache_info)],
- cache_lockdown[CACHE_TYPE(cache_info)],
- CACHE_S(cache_info) ? "harvard" : "unified");
- if (CACHE_S(cache_info)) {
- c_show_cache(m, "I", CACHE_ISIZE(cache_info));
- c_show_cache(m, "D", CACHE_DSIZE(cache_info));
- } else {
- c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
- }
- }
- }
- #endif
- seq_puts(m, "n");
- seq_printf(m, "Hardwaret: %sn", machine_name);
- seq_printf(m, "Revisiont: %04xn", system_rev);
- seq_printf(m, "Serialtt: %08x%08xn",
- system_serial_high, system_serial_low);
- return 0;
- }
- static void *c_start(struct seq_file *m, loff_t *pos)
- {
- return *pos < 1 ? (void *)1 : NULL;
- }
- static void *c_next(struct seq_file *m, void *v, loff_t *pos)
- {
- ++*pos;
- return NULL;
- }
- static void c_stop(struct seq_file *m, void *v)
- {
- }
- struct seq_operations cpuinfo_op = {
- start: c_start,
- next: c_next,
- stop: c_stop,
- show: c_show
- };