2 * linux/arch/arm/kernel/setup.c
4 * Copyright (C) 1995-2001 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/ioport.h>
15 #include <linux/delay.h>
16 #include <linux/utsname.h>
17 #include <linux/initrd.h>
18 #include <linux/console.h>
19 #include <linux/bootmem.h>
20 #include <linux/seq_file.h>
21 #include <linux/tty.h>
22 #include <linux/init.h>
23 #include <linux/root_dev.h>
24 #include <linux/cpu.h>
25 #include <linux/interrupt.h>
26 #include <linux/smp.h>
30 #include <asm/procinfo.h>
31 #include <asm/setup.h>
32 #include <asm/mach-types.h>
33 #include <asm/cacheflush.h>
34 #include <asm/tlbflush.h>
36 #include <asm/mach/arch.h>
37 #include <asm/mach/irq.h>
38 #include <asm/mach/time.h>
43 #define MEM_SIZE (16*1024*1024)
46 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
49 static int __init fpe_setup(char *line)
51 memcpy(fpe_type, line, 8);
55 __setup("fpe=", fpe_setup);
58 extern void paging_init(struct meminfo *, struct machine_desc *desc);
59 extern void reboot_setup(char *str);
60 extern int root_mountflags;
61 extern void _stext, _text, _etext, __data_start, _edata, _end;
63 unsigned int processor_id;
64 unsigned int __machine_arch_type;
65 EXPORT_SYMBOL(__machine_arch_type);
67 unsigned int system_rev;
68 EXPORT_SYMBOL(system_rev);
70 unsigned int system_serial_low;
71 EXPORT_SYMBOL(system_serial_low);
73 unsigned int system_serial_high;
74 EXPORT_SYMBOL(system_serial_high);
76 unsigned int elf_hwcap;
77 EXPORT_SYMBOL(elf_hwcap);
81 struct processor processor;
84 struct cpu_tlb_fns cpu_tlb;
87 struct cpu_user_fns cpu_user;
90 struct cpu_cache_fns cpu_cache;
97 } ____cacheline_aligned;
99 static struct stack stacks[NR_CPUS];
101 char elf_platform[ELF_PLATFORM_SIZE];
102 EXPORT_SYMBOL(elf_platform);
104 unsigned long phys_initrd_start __initdata = 0;
105 unsigned long phys_initrd_size __initdata = 0;
107 static struct meminfo meminfo __initdata = { 0, };
108 static const char *cpu_name;
109 static const char *machine_name;
110 static char command_line[COMMAND_LINE_SIZE];
112 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
113 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
114 #define ENDIANNESS ((char)endian_test.l)
116 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
119 * Standard memory resources
121 static struct resource mem_res[] = {
122 { "Video RAM", 0, 0, IORESOURCE_MEM },
123 { "Kernel text", 0, 0, IORESOURCE_MEM },
124 { "Kernel data", 0, 0, IORESOURCE_MEM }
127 #define video_ram mem_res[0]
128 #define kernel_code mem_res[1]
129 #define kernel_data mem_res[2]
131 static struct resource io_res[] = {
132 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
133 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
134 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
137 #define lp0 io_res[0]
138 #define lp1 io_res[1]
139 #define lp2 io_res[2]
141 static const char *cache_types[16] = {
160 static const char *cache_clean[16] = {
179 static const char *cache_lockdown[16] = {
198 static const char *proc_arch[] = {
218 #define CACHE_TYPE(x) (((x) >> 25) & 15)
219 #define CACHE_S(x) ((x) & (1 << 24))
220 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
221 #define CACHE_ISIZE(x) ((x) & 4095)
223 #define CACHE_SIZE(y) (((y) >> 6) & 7)
224 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
225 #define CACHE_M(y) ((y) & (1 << 2))
226 #define CACHE_LINE(y) ((y) & 3)
228 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
230 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
232 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
234 mult << (8 + CACHE_SIZE(cache)),
235 (mult << CACHE_ASSOC(cache)) >> 1,
236 8 << CACHE_LINE(cache),
237 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
241 static void __init dump_cpu_info(int cpu)
243 unsigned int info = read_cpuid(CPUID_CACHETYPE);
245 if (info != processor_id) {
246 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
247 cache_types[CACHE_TYPE(info)]);
249 dump_cache("I cache", cpu, CACHE_ISIZE(info));
250 dump_cache("D cache", cpu, CACHE_DSIZE(info));
252 dump_cache("cache", cpu, CACHE_ISIZE(info));
256 if (arch_is_coherent())
257 printk("Cache coherency enabled\n");
260 int cpu_architecture(void)
264 if ((processor_id & 0x0008f000) == 0) {
265 cpu_arch = CPU_ARCH_UNKNOWN;
266 } else if ((processor_id & 0x0008f000) == 0x00007000) {
267 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
268 } else if ((processor_id & 0x00080000) == 0x00000000) {
269 cpu_arch = (processor_id >> 16) & 7;
271 cpu_arch += CPU_ARCH_ARMv3;
273 /* the revised CPUID */
274 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
281 * These functions re-use the assembly code in head.S, which
282 * already provide the required functionality.
284 extern struct proc_info_list *lookup_processor_type(unsigned int);
285 extern struct machine_desc *lookup_machine_type(unsigned int);
287 static void __init setup_processor(void)
289 struct proc_info_list *list;
292 * locate processor in the list of supported processor
293 * types. The linker builds this table for us from the
294 * entries in arch/arm/mm/proc-*.S
296 list = lookup_processor_type(processor_id);
298 printk("CPU configuration botched (ID %08x), unable "
299 "to continue.\n", processor_id);
303 cpu_name = list->cpu_name;
306 processor = *list->proc;
309 cpu_tlb = *list->tlb;
312 cpu_user = *list->user;
315 cpu_cache = *list->cache;
318 printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
319 cpu_name, processor_id, (int)processor_id & 15,
320 proc_arch[cpu_architecture()]);
322 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
323 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
324 elf_hwcap = list->elf_hwcap;
330 * cpu_init - initialise one CPU.
332 * cpu_init dumps the cache information, initialises SMP specific
333 * information, and sets up the per-CPU stacks.
337 unsigned int cpu = smp_processor_id();
338 struct stack *stk = &stacks[cpu];
340 if (cpu >= NR_CPUS) {
341 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
345 if (system_state == SYSTEM_BOOTING)
349 * setup stacks for re-entrant exception handlers
361 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
362 "I" (offsetof(struct stack, irq[0])),
363 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
364 "I" (offsetof(struct stack, abt[0])),
365 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
366 "I" (offsetof(struct stack, und[0])),
367 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
371 static struct machine_desc * __init setup_machine(unsigned int nr)
373 struct machine_desc *list;
376 * locate machine in the list of supported machines.
378 list = lookup_machine_type(nr);
380 printk("Machine configuration botched (nr %d), unable "
381 "to continue.\n", nr);
385 printk("Machine: %s\n", list->name);
390 static void __init early_initrd(char **p)
392 unsigned long start, size;
394 start = memparse(*p, p);
396 size = memparse((*p) + 1, p);
398 phys_initrd_start = start;
399 phys_initrd_size = size;
402 __early_param("initrd=", early_initrd);
404 static void __init add_memory(unsigned long start, unsigned long size)
407 * Ensure that start/size are aligned to a page boundary.
408 * Size is appropriately rounded down, start is rounded up.
410 size -= start & ~PAGE_MASK;
412 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
413 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
414 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
415 meminfo.nr_banks += 1;
419 * Pick out the memory size. We look for mem=size@start,
420 * where start and size are "size[KkMm]"
422 static void __init early_mem(char **p)
424 static int usermem __initdata = 0;
425 unsigned long size, start;
428 * If the user specifies memory size, we
429 * blow away any automatically generated
434 meminfo.nr_banks = 0;
438 size = memparse(*p, p);
440 start = memparse(*p + 1, p);
442 add_memory(start, size);
444 __early_param("mem=", early_mem);
447 * Initial parsing of the command line.
449 static void __init parse_cmdline(char **cmdline_p, char *from)
451 char c = ' ', *to = command_line;
456 extern struct early_params __early_begin, __early_end;
457 struct early_params *p;
459 for (p = &__early_begin; p < &__early_end; p++) {
460 int len = strlen(p->arg);
462 if (memcmp(from, p->arg, len) == 0) {
463 if (to != command_line)
468 while (*from != ' ' && *from != '\0')
477 if (COMMAND_LINE_SIZE <= ++len)
482 *cmdline_p = command_line;
486 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
488 #ifdef CONFIG_BLK_DEV_RAM
489 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
491 rd_image_start = image_start;
501 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
503 struct resource *res;
506 kernel_code.start = virt_to_phys(&_text);
507 kernel_code.end = virt_to_phys(&_etext - 1);
508 kernel_data.start = virt_to_phys(&__data_start);
509 kernel_data.end = virt_to_phys(&_end - 1);
511 for (i = 0; i < mi->nr_banks; i++) {
512 unsigned long virt_start, virt_end;
514 if (mi->bank[i].size == 0)
517 virt_start = __phys_to_virt(mi->bank[i].start);
518 virt_end = virt_start + mi->bank[i].size - 1;
520 res = alloc_bootmem_low(sizeof(*res));
521 res->name = "System RAM";
522 res->start = __virt_to_phys(virt_start);
523 res->end = __virt_to_phys(virt_end);
524 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
526 request_resource(&iomem_resource, res);
528 if (kernel_code.start >= res->start &&
529 kernel_code.end <= res->end)
530 request_resource(res, &kernel_code);
531 if (kernel_data.start >= res->start &&
532 kernel_data.end <= res->end)
533 request_resource(res, &kernel_data);
536 if (mdesc->video_start) {
537 video_ram.start = mdesc->video_start;
538 video_ram.end = mdesc->video_end;
539 request_resource(&iomem_resource, &video_ram);
543 * Some machines don't have the possibility of ever
544 * possessing lp0, lp1 or lp2
546 if (mdesc->reserve_lp0)
547 request_resource(&ioport_resource, &lp0);
548 if (mdesc->reserve_lp1)
549 request_resource(&ioport_resource, &lp1);
550 if (mdesc->reserve_lp2)
551 request_resource(&ioport_resource, &lp2);
557 * This is the new way of passing data to the kernel at boot time. Rather
558 * than passing a fixed inflexible structure to the kernel, we pass a list
559 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
560 * tag for the list to be recognised (to distinguish the tagged list from
561 * a param_struct). The list is terminated with a zero-length tag (this tag
562 * is not parsed in any way).
564 static int __init parse_tag_core(const struct tag *tag)
566 if (tag->hdr.size > 2) {
567 if ((tag->u.core.flags & 1) == 0)
568 root_mountflags &= ~MS_RDONLY;
569 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
574 __tagtable(ATAG_CORE, parse_tag_core);
576 static int __init parse_tag_mem32(const struct tag *tag)
578 if (meminfo.nr_banks >= NR_BANKS) {
580 "Ignoring memory bank 0x%08x size %dKB\n",
581 tag->u.mem.start, tag->u.mem.size / 1024);
584 add_memory(tag->u.mem.start, tag->u.mem.size);
588 __tagtable(ATAG_MEM, parse_tag_mem32);
590 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
591 struct screen_info screen_info = {
592 .orig_video_lines = 30,
593 .orig_video_cols = 80,
594 .orig_video_mode = 0,
595 .orig_video_ega_bx = 0,
596 .orig_video_isVGA = 1,
597 .orig_video_points = 8
600 static int __init parse_tag_videotext(const struct tag *tag)
602 screen_info.orig_x = tag->u.videotext.x;
603 screen_info.orig_y = tag->u.videotext.y;
604 screen_info.orig_video_page = tag->u.videotext.video_page;
605 screen_info.orig_video_mode = tag->u.videotext.video_mode;
606 screen_info.orig_video_cols = tag->u.videotext.video_cols;
607 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
608 screen_info.orig_video_lines = tag->u.videotext.video_lines;
609 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
610 screen_info.orig_video_points = tag->u.videotext.video_points;
614 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
617 static int __init parse_tag_ramdisk(const struct tag *tag)
619 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
620 (tag->u.ramdisk.flags & 2) == 0,
621 tag->u.ramdisk.start, tag->u.ramdisk.size);
625 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
627 static int __init parse_tag_initrd(const struct tag *tag)
629 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
630 "please update your bootloader.\n");
631 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
632 phys_initrd_size = tag->u.initrd.size;
636 __tagtable(ATAG_INITRD, parse_tag_initrd);
638 static int __init parse_tag_initrd2(const struct tag *tag)
640 phys_initrd_start = tag->u.initrd.start;
641 phys_initrd_size = tag->u.initrd.size;
645 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
647 static int __init parse_tag_serialnr(const struct tag *tag)
649 system_serial_low = tag->u.serialnr.low;
650 system_serial_high = tag->u.serialnr.high;
654 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
656 static int __init parse_tag_revision(const struct tag *tag)
658 system_rev = tag->u.revision.rev;
662 __tagtable(ATAG_REVISION, parse_tag_revision);
664 static int __init parse_tag_cmdline(const struct tag *tag)
666 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
670 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
673 * Scan the tag table for this tag, and call its parse function.
674 * The tag table is built by the linker from all the __tagtable
677 static int __init parse_tag(const struct tag *tag)
679 extern struct tagtable __tagtable_begin, __tagtable_end;
682 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
683 if (tag->hdr.tag == t->tag) {
688 return t < &__tagtable_end;
692 * Parse all tags in the list, checking both the global and architecture
693 * specific tag tables.
695 static void __init parse_tags(const struct tag *t)
697 for (; t->hdr.size; t = tag_next(t))
700 "Ignoring unrecognised tag 0x%08x\n",
705 * This holds our defaults.
707 static struct init_tags {
708 struct tag_header hdr1;
709 struct tag_core core;
710 struct tag_header hdr2;
711 struct tag_mem32 mem;
712 struct tag_header hdr3;
713 } init_tags __initdata = {
714 { tag_size(tag_core), ATAG_CORE },
715 { 1, PAGE_SIZE, 0xff },
716 { tag_size(tag_mem32), ATAG_MEM },
717 { MEM_SIZE, PHYS_OFFSET },
721 static void (*init_machine)(void) __initdata;
723 static int __init customize_machine(void)
725 /* customizes platform devices, or adds new ones */
730 arch_initcall(customize_machine);
732 void __init setup_arch(char **cmdline_p)
734 struct tag *tags = (struct tag *)&init_tags;
735 struct machine_desc *mdesc;
736 char *from = default_command_line;
739 mdesc = setup_machine(machine_arch_type);
740 machine_name = mdesc->name;
742 if (mdesc->soft_reboot)
745 if (mdesc->boot_params)
746 tags = phys_to_virt(mdesc->boot_params);
749 * If we have the old style parameters, convert them to
752 if (tags->hdr.tag != ATAG_CORE)
753 convert_to_tag_list(tags);
754 if (tags->hdr.tag != ATAG_CORE)
755 tags = (struct tag *)&init_tags;
758 mdesc->fixup(mdesc, tags, &from, &meminfo);
760 if (tags->hdr.tag == ATAG_CORE) {
761 if (meminfo.nr_banks != 0)
762 squash_mem_tags(tags);
766 init_mm.start_code = (unsigned long) &_text;
767 init_mm.end_code = (unsigned long) &_etext;
768 init_mm.end_data = (unsigned long) &_edata;
769 init_mm.brk = (unsigned long) &_end;
771 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
772 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
773 parse_cmdline(cmdline_p, from);
774 paging_init(&meminfo, mdesc);
775 request_standard_resources(&meminfo, mdesc);
784 * Set up various architecture-specific pointers
786 init_arch_irq = mdesc->init_irq;
787 system_timer = mdesc->timer;
788 init_machine = mdesc->init_machine;
791 #if defined(CONFIG_VGA_CONSOLE)
792 conswitchp = &vga_con;
793 #elif defined(CONFIG_DUMMY_CONSOLE)
794 conswitchp = &dummy_con;
800 static int __init topology_init(void)
805 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu, NULL);
810 subsys_initcall(topology_init);
812 static const char *hwcap_str[] = {
826 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
828 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
830 seq_printf(m, "%s size\t\t: %d\n"
832 "%s line length\t: %d\n"
834 type, mult << (8 + CACHE_SIZE(cache)),
835 type, (mult << CACHE_ASSOC(cache)) >> 1,
836 type, 8 << CACHE_LINE(cache),
837 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
841 static int c_show(struct seq_file *m, void *v)
845 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
846 cpu_name, (int)processor_id & 15, elf_platform);
848 #if defined(CONFIG_SMP)
849 for_each_online_cpu(i) {
851 * glibc reads /proc/cpuinfo to determine the number of
852 * online processors, looking for lines beginning with
853 * "processor". Give glibc what it expects.
855 seq_printf(m, "processor\t: %d\n", i);
856 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
857 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
858 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
860 #else /* CONFIG_SMP */
861 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
862 loops_per_jiffy / (500000/HZ),
863 (loops_per_jiffy / (5000/HZ)) % 100);
866 /* dump out the processor features */
867 seq_puts(m, "Features\t: ");
869 for (i = 0; hwcap_str[i]; i++)
870 if (elf_hwcap & (1 << i))
871 seq_printf(m, "%s ", hwcap_str[i]);
873 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
874 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
876 if ((processor_id & 0x0008f000) == 0x00000000) {
878 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
880 if ((processor_id & 0x0008f000) == 0x00007000) {
882 seq_printf(m, "CPU variant\t: 0x%02x\n",
883 (processor_id >> 16) & 127);
886 seq_printf(m, "CPU variant\t: 0x%x\n",
887 (processor_id >> 20) & 15);
889 seq_printf(m, "CPU part\t: 0x%03x\n",
890 (processor_id >> 4) & 0xfff);
892 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
895 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
896 if (cache_info != processor_id) {
897 seq_printf(m, "Cache type\t: %s\n"
898 "Cache clean\t: %s\n"
899 "Cache lockdown\t: %s\n"
900 "Cache format\t: %s\n",
901 cache_types[CACHE_TYPE(cache_info)],
902 cache_clean[CACHE_TYPE(cache_info)],
903 cache_lockdown[CACHE_TYPE(cache_info)],
904 CACHE_S(cache_info) ? "Harvard" : "Unified");
906 if (CACHE_S(cache_info)) {
907 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
908 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
910 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
917 seq_printf(m, "Hardware\t: %s\n", machine_name);
918 seq_printf(m, "Revision\t: %04x\n", system_rev);
919 seq_printf(m, "Serial\t\t: %08x%08x\n",
920 system_serial_high, system_serial_low);
925 static void *c_start(struct seq_file *m, loff_t *pos)
927 return *pos < 1 ? (void *)1 : NULL;
930 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
936 static void c_stop(struct seq_file *m, void *v)
940 struct seq_operations cpuinfo_op = {