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/module.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/initrd.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/seq_file.h>
20 #include <linux/tty.h>
21 #include <linux/init.h>
22 #include <linux/root_dev.h>
23 #include <linux/cpu.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp.h>
29 #include <asm/procinfo.h>
30 #include <asm/setup.h>
31 #include <asm/mach-types.h>
32 #include <asm/cacheflush.h>
33 #include <asm/tlbflush.h>
35 #include <asm/mach/arch.h>
36 #include <asm/mach/irq.h>
37 #include <asm/mach/time.h>
42 #define MEM_SIZE (16*1024*1024)
45 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
48 static int __init fpe_setup(char *line)
50 memcpy(fpe_type, line, 8);
54 __setup("fpe=", fpe_setup);
57 extern void paging_init(struct meminfo *, struct machine_desc *desc);
58 extern void reboot_setup(char *str);
59 extern int root_mountflags;
60 extern void _stext, _text, _etext, __data_start, _edata, _end;
62 unsigned int processor_id;
63 unsigned int __machine_arch_type;
64 EXPORT_SYMBOL(__machine_arch_type);
66 unsigned int system_rev;
67 EXPORT_SYMBOL(system_rev);
69 unsigned int system_serial_low;
70 EXPORT_SYMBOL(system_serial_low);
72 unsigned int system_serial_high;
73 EXPORT_SYMBOL(system_serial_high);
75 unsigned int elf_hwcap;
76 EXPORT_SYMBOL(elf_hwcap);
80 struct processor processor;
83 struct cpu_tlb_fns cpu_tlb;
86 struct cpu_user_fns cpu_user;
89 struct cpu_cache_fns cpu_cache;
96 } ____cacheline_aligned;
98 static struct stack stacks[NR_CPUS];
100 char elf_platform[ELF_PLATFORM_SIZE];
101 EXPORT_SYMBOL(elf_platform);
103 unsigned long phys_initrd_start __initdata = 0;
104 unsigned long phys_initrd_size __initdata = 0;
106 static struct meminfo meminfo __initdata = { 0, };
107 static const char *cpu_name;
108 static const char *machine_name;
109 static char command_line[COMMAND_LINE_SIZE];
111 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
112 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
113 #define ENDIANNESS ((char)endian_test.l)
115 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
118 * Standard memory resources
120 static struct resource mem_res[] = {
125 .flags = IORESOURCE_MEM
128 .name = "Kernel text",
131 .flags = IORESOURCE_MEM
134 .name = "Kernel data",
137 .flags = IORESOURCE_MEM
141 #define video_ram mem_res[0]
142 #define kernel_code mem_res[1]
143 #define kernel_data mem_res[2]
145 static struct resource io_res[] = {
150 .flags = IORESOURCE_IO | IORESOURCE_BUSY
156 .flags = IORESOURCE_IO | IORESOURCE_BUSY
162 .flags = IORESOURCE_IO | IORESOURCE_BUSY
166 #define lp0 io_res[0]
167 #define lp1 io_res[1]
168 #define lp2 io_res[2]
170 static const char *cache_types[16] = {
189 static const char *cache_clean[16] = {
208 static const char *cache_lockdown[16] = {
227 static const char *proc_arch[] = {
247 #define CACHE_TYPE(x) (((x) >> 25) & 15)
248 #define CACHE_S(x) ((x) & (1 << 24))
249 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
250 #define CACHE_ISIZE(x) ((x) & 4095)
252 #define CACHE_SIZE(y) (((y) >> 6) & 7)
253 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
254 #define CACHE_M(y) ((y) & (1 << 2))
255 #define CACHE_LINE(y) ((y) & 3)
257 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
259 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
261 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
263 mult << (8 + CACHE_SIZE(cache)),
264 (mult << CACHE_ASSOC(cache)) >> 1,
265 8 << CACHE_LINE(cache),
266 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
270 static void __init dump_cpu_info(int cpu)
272 unsigned int info = read_cpuid(CPUID_CACHETYPE);
274 if (info != processor_id) {
275 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
276 cache_types[CACHE_TYPE(info)]);
278 dump_cache("I cache", cpu, CACHE_ISIZE(info));
279 dump_cache("D cache", cpu, CACHE_DSIZE(info));
281 dump_cache("cache", cpu, CACHE_ISIZE(info));
285 if (arch_is_coherent())
286 printk("Cache coherency enabled\n");
289 int cpu_architecture(void)
293 if ((processor_id & 0x0008f000) == 0) {
294 cpu_arch = CPU_ARCH_UNKNOWN;
295 } else if ((processor_id & 0x0008f000) == 0x00007000) {
296 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
297 } else if ((processor_id & 0x00080000) == 0x00000000) {
298 cpu_arch = (processor_id >> 16) & 7;
300 cpu_arch += CPU_ARCH_ARMv3;
302 /* the revised CPUID */
303 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
310 * These functions re-use the assembly code in head.S, which
311 * already provide the required functionality.
313 extern struct proc_info_list *lookup_processor_type(unsigned int);
314 extern struct machine_desc *lookup_machine_type(unsigned int);
316 static void __init setup_processor(void)
318 struct proc_info_list *list;
321 * locate processor in the list of supported processor
322 * types. The linker builds this table for us from the
323 * entries in arch/arm/mm/proc-*.S
325 list = lookup_processor_type(processor_id);
327 printk("CPU configuration botched (ID %08x), unable "
328 "to continue.\n", processor_id);
332 cpu_name = list->cpu_name;
335 processor = *list->proc;
338 cpu_tlb = *list->tlb;
341 cpu_user = *list->user;
344 cpu_cache = *list->cache;
347 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
348 cpu_name, processor_id, (int)processor_id & 15,
349 proc_arch[cpu_architecture()], cr_alignment);
351 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
352 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
353 elf_hwcap = list->elf_hwcap;
354 #ifndef CONFIG_ARM_THUMB
355 elf_hwcap &= ~HWCAP_THUMB;
358 elf_hwcap &= ~HWCAP_VFP;
365 * cpu_init - initialise one CPU.
367 * cpu_init dumps the cache information, initialises SMP specific
368 * information, and sets up the per-CPU stacks.
372 unsigned int cpu = smp_processor_id();
373 struct stack *stk = &stacks[cpu];
375 if (cpu >= NR_CPUS) {
376 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
380 if (system_state == SYSTEM_BOOTING)
384 * setup stacks for re-entrant exception handlers
396 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
397 "I" (offsetof(struct stack, irq[0])),
398 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
399 "I" (offsetof(struct stack, abt[0])),
400 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
401 "I" (offsetof(struct stack, und[0])),
402 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
406 static struct machine_desc * __init setup_machine(unsigned int nr)
408 struct machine_desc *list;
411 * locate machine in the list of supported machines.
413 list = lookup_machine_type(nr);
415 printk("Machine configuration botched (nr %d), unable "
416 "to continue.\n", nr);
420 printk("Machine: %s\n", list->name);
425 static void __init early_initrd(char **p)
427 unsigned long start, size;
429 start = memparse(*p, p);
431 size = memparse((*p) + 1, p);
433 phys_initrd_start = start;
434 phys_initrd_size = size;
437 __early_param("initrd=", early_initrd);
439 static void __init arm_add_memory(unsigned long start, unsigned long size)
442 * Ensure that start/size are aligned to a page boundary.
443 * Size is appropriately rounded down, start is rounded up.
445 size -= start & ~PAGE_MASK;
447 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
448 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
449 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
450 meminfo.nr_banks += 1;
454 * Pick out the memory size. We look for mem=size@start,
455 * where start and size are "size[KkMm]"
457 static void __init early_mem(char **p)
459 static int usermem __initdata = 0;
460 unsigned long size, start;
463 * If the user specifies memory size, we
464 * blow away any automatically generated
469 meminfo.nr_banks = 0;
473 size = memparse(*p, p);
475 start = memparse(*p + 1, p);
477 arm_add_memory(start, size);
479 __early_param("mem=", early_mem);
482 * Initial parsing of the command line.
484 static void __init parse_cmdline(char **cmdline_p, char *from)
486 char c = ' ', *to = command_line;
491 extern struct early_params __early_begin, __early_end;
492 struct early_params *p;
494 for (p = &__early_begin; p < &__early_end; p++) {
495 int len = strlen(p->arg);
497 if (memcmp(from, p->arg, len) == 0) {
498 if (to != command_line)
503 while (*from != ' ' && *from != '\0')
512 if (COMMAND_LINE_SIZE <= ++len)
517 *cmdline_p = command_line;
521 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
523 #ifdef CONFIG_BLK_DEV_RAM
524 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
526 rd_image_start = image_start;
536 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
538 struct resource *res;
541 kernel_code.start = virt_to_phys(&_text);
542 kernel_code.end = virt_to_phys(&_etext - 1);
543 kernel_data.start = virt_to_phys(&__data_start);
544 kernel_data.end = virt_to_phys(&_end - 1);
546 for (i = 0; i < mi->nr_banks; i++) {
547 unsigned long virt_start, virt_end;
549 if (mi->bank[i].size == 0)
552 virt_start = __phys_to_virt(mi->bank[i].start);
553 virt_end = virt_start + mi->bank[i].size - 1;
555 res = alloc_bootmem_low(sizeof(*res));
556 res->name = "System RAM";
557 res->start = __virt_to_phys(virt_start);
558 res->end = __virt_to_phys(virt_end);
559 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
561 request_resource(&iomem_resource, res);
563 if (kernel_code.start >= res->start &&
564 kernel_code.end <= res->end)
565 request_resource(res, &kernel_code);
566 if (kernel_data.start >= res->start &&
567 kernel_data.end <= res->end)
568 request_resource(res, &kernel_data);
571 if (mdesc->video_start) {
572 video_ram.start = mdesc->video_start;
573 video_ram.end = mdesc->video_end;
574 request_resource(&iomem_resource, &video_ram);
578 * Some machines don't have the possibility of ever
579 * possessing lp0, lp1 or lp2
581 if (mdesc->reserve_lp0)
582 request_resource(&ioport_resource, &lp0);
583 if (mdesc->reserve_lp1)
584 request_resource(&ioport_resource, &lp1);
585 if (mdesc->reserve_lp2)
586 request_resource(&ioport_resource, &lp2);
592 * This is the new way of passing data to the kernel at boot time. Rather
593 * than passing a fixed inflexible structure to the kernel, we pass a list
594 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
595 * tag for the list to be recognised (to distinguish the tagged list from
596 * a param_struct). The list is terminated with a zero-length tag (this tag
597 * is not parsed in any way).
599 static int __init parse_tag_core(const struct tag *tag)
601 if (tag->hdr.size > 2) {
602 if ((tag->u.core.flags & 1) == 0)
603 root_mountflags &= ~MS_RDONLY;
604 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
609 __tagtable(ATAG_CORE, parse_tag_core);
611 static int __init parse_tag_mem32(const struct tag *tag)
613 if (meminfo.nr_banks >= NR_BANKS) {
615 "Ignoring memory bank 0x%08x size %dKB\n",
616 tag->u.mem.start, tag->u.mem.size / 1024);
619 arm_add_memory(tag->u.mem.start, tag->u.mem.size);
623 __tagtable(ATAG_MEM, parse_tag_mem32);
625 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
626 struct screen_info screen_info = {
627 .orig_video_lines = 30,
628 .orig_video_cols = 80,
629 .orig_video_mode = 0,
630 .orig_video_ega_bx = 0,
631 .orig_video_isVGA = 1,
632 .orig_video_points = 8
635 static int __init parse_tag_videotext(const struct tag *tag)
637 screen_info.orig_x = tag->u.videotext.x;
638 screen_info.orig_y = tag->u.videotext.y;
639 screen_info.orig_video_page = tag->u.videotext.video_page;
640 screen_info.orig_video_mode = tag->u.videotext.video_mode;
641 screen_info.orig_video_cols = tag->u.videotext.video_cols;
642 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
643 screen_info.orig_video_lines = tag->u.videotext.video_lines;
644 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
645 screen_info.orig_video_points = tag->u.videotext.video_points;
649 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
652 static int __init parse_tag_ramdisk(const struct tag *tag)
654 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
655 (tag->u.ramdisk.flags & 2) == 0,
656 tag->u.ramdisk.start, tag->u.ramdisk.size);
660 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
662 static int __init parse_tag_initrd(const struct tag *tag)
664 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
665 "please update your bootloader.\n");
666 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
667 phys_initrd_size = tag->u.initrd.size;
671 __tagtable(ATAG_INITRD, parse_tag_initrd);
673 static int __init parse_tag_initrd2(const struct tag *tag)
675 phys_initrd_start = tag->u.initrd.start;
676 phys_initrd_size = tag->u.initrd.size;
680 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
682 static int __init parse_tag_serialnr(const struct tag *tag)
684 system_serial_low = tag->u.serialnr.low;
685 system_serial_high = tag->u.serialnr.high;
689 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
691 static int __init parse_tag_revision(const struct tag *tag)
693 system_rev = tag->u.revision.rev;
697 __tagtable(ATAG_REVISION, parse_tag_revision);
699 static int __init parse_tag_cmdline(const struct tag *tag)
701 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
705 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
708 * Scan the tag table for this tag, and call its parse function.
709 * The tag table is built by the linker from all the __tagtable
712 static int __init parse_tag(const struct tag *tag)
714 extern struct tagtable __tagtable_begin, __tagtable_end;
717 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
718 if (tag->hdr.tag == t->tag) {
723 return t < &__tagtable_end;
727 * Parse all tags in the list, checking both the global and architecture
728 * specific tag tables.
730 static void __init parse_tags(const struct tag *t)
732 for (; t->hdr.size; t = tag_next(t))
735 "Ignoring unrecognised tag 0x%08x\n",
740 * This holds our defaults.
742 static struct init_tags {
743 struct tag_header hdr1;
744 struct tag_core core;
745 struct tag_header hdr2;
746 struct tag_mem32 mem;
747 struct tag_header hdr3;
748 } init_tags __initdata = {
749 { tag_size(tag_core), ATAG_CORE },
750 { 1, PAGE_SIZE, 0xff },
751 { tag_size(tag_mem32), ATAG_MEM },
752 { MEM_SIZE, PHYS_OFFSET },
756 static void (*init_machine)(void) __initdata;
758 static int __init customize_machine(void)
760 /* customizes platform devices, or adds new ones */
765 arch_initcall(customize_machine);
767 void __init setup_arch(char **cmdline_p)
769 struct tag *tags = (struct tag *)&init_tags;
770 struct machine_desc *mdesc;
771 char *from = default_command_line;
774 mdesc = setup_machine(machine_arch_type);
775 machine_name = mdesc->name;
777 if (mdesc->soft_reboot)
780 if (mdesc->boot_params)
781 tags = phys_to_virt(mdesc->boot_params);
784 * If we have the old style parameters, convert them to
787 if (tags->hdr.tag != ATAG_CORE)
788 convert_to_tag_list(tags);
789 if (tags->hdr.tag != ATAG_CORE)
790 tags = (struct tag *)&init_tags;
793 mdesc->fixup(mdesc, tags, &from, &meminfo);
795 if (tags->hdr.tag == ATAG_CORE) {
796 if (meminfo.nr_banks != 0)
797 squash_mem_tags(tags);
801 init_mm.start_code = (unsigned long) &_text;
802 init_mm.end_code = (unsigned long) &_etext;
803 init_mm.end_data = (unsigned long) &_edata;
804 init_mm.brk = (unsigned long) &_end;
806 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
807 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
808 parse_cmdline(cmdline_p, from);
809 paging_init(&meminfo, mdesc);
810 request_standard_resources(&meminfo, mdesc);
819 * Set up various architecture-specific pointers
821 init_arch_irq = mdesc->init_irq;
822 system_timer = mdesc->timer;
823 init_machine = mdesc->init_machine;
826 #if defined(CONFIG_VGA_CONSOLE)
827 conswitchp = &vga_con;
828 #elif defined(CONFIG_DUMMY_CONSOLE)
829 conswitchp = &dummy_con;
835 static int __init topology_init(void)
839 for_each_possible_cpu(cpu)
840 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
845 subsys_initcall(topology_init);
847 static const char *hwcap_str[] = {
861 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
863 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
865 seq_printf(m, "%s size\t\t: %d\n"
867 "%s line length\t: %d\n"
869 type, mult << (8 + CACHE_SIZE(cache)),
870 type, (mult << CACHE_ASSOC(cache)) >> 1,
871 type, 8 << CACHE_LINE(cache),
872 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
876 static int c_show(struct seq_file *m, void *v)
880 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
881 cpu_name, (int)processor_id & 15, elf_platform);
883 #if defined(CONFIG_SMP)
884 for_each_online_cpu(i) {
886 * glibc reads /proc/cpuinfo to determine the number of
887 * online processors, looking for lines beginning with
888 * "processor". Give glibc what it expects.
890 seq_printf(m, "processor\t: %d\n", i);
891 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
892 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
893 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
895 #else /* CONFIG_SMP */
896 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
897 loops_per_jiffy / (500000/HZ),
898 (loops_per_jiffy / (5000/HZ)) % 100);
901 /* dump out the processor features */
902 seq_puts(m, "Features\t: ");
904 for (i = 0; hwcap_str[i]; i++)
905 if (elf_hwcap & (1 << i))
906 seq_printf(m, "%s ", hwcap_str[i]);
908 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
909 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
911 if ((processor_id & 0x0008f000) == 0x00000000) {
913 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
915 if ((processor_id & 0x0008f000) == 0x00007000) {
917 seq_printf(m, "CPU variant\t: 0x%02x\n",
918 (processor_id >> 16) & 127);
921 seq_printf(m, "CPU variant\t: 0x%x\n",
922 (processor_id >> 20) & 15);
924 seq_printf(m, "CPU part\t: 0x%03x\n",
925 (processor_id >> 4) & 0xfff);
927 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
930 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
931 if (cache_info != processor_id) {
932 seq_printf(m, "Cache type\t: %s\n"
933 "Cache clean\t: %s\n"
934 "Cache lockdown\t: %s\n"
935 "Cache format\t: %s\n",
936 cache_types[CACHE_TYPE(cache_info)],
937 cache_clean[CACHE_TYPE(cache_info)],
938 cache_lockdown[CACHE_TYPE(cache_info)],
939 CACHE_S(cache_info) ? "Harvard" : "Unified");
941 if (CACHE_S(cache_info)) {
942 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
943 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
945 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
952 seq_printf(m, "Hardware\t: %s\n", machine_name);
953 seq_printf(m, "Revision\t: %04x\n", system_rev);
954 seq_printf(m, "Serial\t\t: %08x%08x\n",
955 system_serial_high, system_serial_low);
960 static void *c_start(struct seq_file *m, loff_t *pos)
962 return *pos < 1 ? (void *)1 : NULL;
965 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
971 static void c_stop(struct seq_file *m, void *v)
975 struct seq_operations cpuinfo_op = {