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[] = {
126 .flags = IORESOURCE_MEM
129 .name = "Kernel text",
132 .flags = IORESOURCE_MEM
135 .name = "Kernel data",
138 .flags = IORESOURCE_MEM
142 #define video_ram mem_res[0]
143 #define kernel_code mem_res[1]
144 #define kernel_data mem_res[2]
146 static struct resource io_res[] = {
151 .flags = IORESOURCE_IO | IORESOURCE_BUSY
157 .flags = IORESOURCE_IO | IORESOURCE_BUSY
163 .flags = IORESOURCE_IO | IORESOURCE_BUSY
167 #define lp0 io_res[0]
168 #define lp1 io_res[1]
169 #define lp2 io_res[2]
171 static const char *cache_types[16] = {
190 static const char *cache_clean[16] = {
209 static const char *cache_lockdown[16] = {
228 static const char *proc_arch[] = {
248 #define CACHE_TYPE(x) (((x) >> 25) & 15)
249 #define CACHE_S(x) ((x) & (1 << 24))
250 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
251 #define CACHE_ISIZE(x) ((x) & 4095)
253 #define CACHE_SIZE(y) (((y) >> 6) & 7)
254 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
255 #define CACHE_M(y) ((y) & (1 << 2))
256 #define CACHE_LINE(y) ((y) & 3)
258 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
260 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
262 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
264 mult << (8 + CACHE_SIZE(cache)),
265 (mult << CACHE_ASSOC(cache)) >> 1,
266 8 << CACHE_LINE(cache),
267 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
271 static void __init dump_cpu_info(int cpu)
273 unsigned int info = read_cpuid(CPUID_CACHETYPE);
275 if (info != processor_id) {
276 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
277 cache_types[CACHE_TYPE(info)]);
279 dump_cache("I cache", cpu, CACHE_ISIZE(info));
280 dump_cache("D cache", cpu, CACHE_DSIZE(info));
282 dump_cache("cache", cpu, CACHE_ISIZE(info));
286 if (arch_is_coherent())
287 printk("Cache coherency enabled\n");
290 int cpu_architecture(void)
294 if ((processor_id & 0x0008f000) == 0) {
295 cpu_arch = CPU_ARCH_UNKNOWN;
296 } else if ((processor_id & 0x0008f000) == 0x00007000) {
297 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
298 } else if ((processor_id & 0x00080000) == 0x00000000) {
299 cpu_arch = (processor_id >> 16) & 7;
301 cpu_arch += CPU_ARCH_ARMv3;
303 /* the revised CPUID */
304 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
311 * These functions re-use the assembly code in head.S, which
312 * already provide the required functionality.
314 extern struct proc_info_list *lookup_processor_type(unsigned int);
315 extern struct machine_desc *lookup_machine_type(unsigned int);
317 static void __init setup_processor(void)
319 struct proc_info_list *list;
322 * locate processor in the list of supported processor
323 * types. The linker builds this table for us from the
324 * entries in arch/arm/mm/proc-*.S
326 list = lookup_processor_type(processor_id);
328 printk("CPU configuration botched (ID %08x), unable "
329 "to continue.\n", processor_id);
333 cpu_name = list->cpu_name;
336 processor = *list->proc;
339 cpu_tlb = *list->tlb;
342 cpu_user = *list->user;
345 cpu_cache = *list->cache;
348 printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
349 cpu_name, processor_id, (int)processor_id & 15,
350 proc_arch[cpu_architecture()]);
352 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
353 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
354 elf_hwcap = list->elf_hwcap;
355 #ifndef CONFIG_ARM_THUMB
356 elf_hwcap &= ~HWCAP_THUMB;
359 elf_hwcap &= ~HWCAP_VFP;
366 * cpu_init - initialise one CPU.
368 * cpu_init dumps the cache information, initialises SMP specific
369 * information, and sets up the per-CPU stacks.
373 unsigned int cpu = smp_processor_id();
374 struct stack *stk = &stacks[cpu];
376 if (cpu >= NR_CPUS) {
377 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
381 if (system_state == SYSTEM_BOOTING)
385 * setup stacks for re-entrant exception handlers
397 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
398 "I" (offsetof(struct stack, irq[0])),
399 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
400 "I" (offsetof(struct stack, abt[0])),
401 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
402 "I" (offsetof(struct stack, und[0])),
403 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
407 static struct machine_desc * __init setup_machine(unsigned int nr)
409 struct machine_desc *list;
412 * locate machine in the list of supported machines.
414 list = lookup_machine_type(nr);
416 printk("Machine configuration botched (nr %d), unable "
417 "to continue.\n", nr);
421 printk("Machine: %s\n", list->name);
426 static void __init early_initrd(char **p)
428 unsigned long start, size;
430 start = memparse(*p, p);
432 size = memparse((*p) + 1, p);
434 phys_initrd_start = start;
435 phys_initrd_size = size;
438 __early_param("initrd=", early_initrd);
440 static void __init arm_add_memory(unsigned long start, unsigned long size)
443 * Ensure that start/size are aligned to a page boundary.
444 * Size is appropriately rounded down, start is rounded up.
446 size -= start & ~PAGE_MASK;
448 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
449 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
450 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
451 meminfo.nr_banks += 1;
455 * Pick out the memory size. We look for mem=size@start,
456 * where start and size are "size[KkMm]"
458 static void __init early_mem(char **p)
460 static int usermem __initdata = 0;
461 unsigned long size, start;
464 * If the user specifies memory size, we
465 * blow away any automatically generated
470 meminfo.nr_banks = 0;
474 size = memparse(*p, p);
476 start = memparse(*p + 1, p);
478 arm_add_memory(start, size);
480 __early_param("mem=", early_mem);
483 * Initial parsing of the command line.
485 static void __init parse_cmdline(char **cmdline_p, char *from)
487 char c = ' ', *to = command_line;
492 extern struct early_params __early_begin, __early_end;
493 struct early_params *p;
495 for (p = &__early_begin; p < &__early_end; p++) {
496 int len = strlen(p->arg);
498 if (memcmp(from, p->arg, len) == 0) {
499 if (to != command_line)
504 while (*from != ' ' && *from != '\0')
513 if (COMMAND_LINE_SIZE <= ++len)
518 *cmdline_p = command_line;
522 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
524 #ifdef CONFIG_BLK_DEV_RAM
525 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
527 rd_image_start = image_start;
537 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
539 struct resource *res;
542 kernel_code.start = virt_to_phys(&_text);
543 kernel_code.end = virt_to_phys(&_etext - 1);
544 kernel_data.start = virt_to_phys(&__data_start);
545 kernel_data.end = virt_to_phys(&_end - 1);
547 for (i = 0; i < mi->nr_banks; i++) {
548 unsigned long virt_start, virt_end;
550 if (mi->bank[i].size == 0)
553 virt_start = __phys_to_virt(mi->bank[i].start);
554 virt_end = virt_start + mi->bank[i].size - 1;
556 res = alloc_bootmem_low(sizeof(*res));
557 res->name = "System RAM";
558 res->start = __virt_to_phys(virt_start);
559 res->end = __virt_to_phys(virt_end);
560 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
562 request_resource(&iomem_resource, res);
564 if (kernel_code.start >= res->start &&
565 kernel_code.end <= res->end)
566 request_resource(res, &kernel_code);
567 if (kernel_data.start >= res->start &&
568 kernel_data.end <= res->end)
569 request_resource(res, &kernel_data);
572 if (mdesc->video_start) {
573 video_ram.start = mdesc->video_start;
574 video_ram.end = mdesc->video_end;
575 request_resource(&iomem_resource, &video_ram);
579 * Some machines don't have the possibility of ever
580 * possessing lp0, lp1 or lp2
582 if (mdesc->reserve_lp0)
583 request_resource(&ioport_resource, &lp0);
584 if (mdesc->reserve_lp1)
585 request_resource(&ioport_resource, &lp1);
586 if (mdesc->reserve_lp2)
587 request_resource(&ioport_resource, &lp2);
593 * This is the new way of passing data to the kernel at boot time. Rather
594 * than passing a fixed inflexible structure to the kernel, we pass a list
595 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
596 * tag for the list to be recognised (to distinguish the tagged list from
597 * a param_struct). The list is terminated with a zero-length tag (this tag
598 * is not parsed in any way).
600 static int __init parse_tag_core(const struct tag *tag)
602 if (tag->hdr.size > 2) {
603 if ((tag->u.core.flags & 1) == 0)
604 root_mountflags &= ~MS_RDONLY;
605 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
610 __tagtable(ATAG_CORE, parse_tag_core);
612 static int __init parse_tag_mem32(const struct tag *tag)
614 if (meminfo.nr_banks >= NR_BANKS) {
616 "Ignoring memory bank 0x%08x size %dKB\n",
617 tag->u.mem.start, tag->u.mem.size / 1024);
620 arm_add_memory(tag->u.mem.start, tag->u.mem.size);
624 __tagtable(ATAG_MEM, parse_tag_mem32);
626 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
627 struct screen_info screen_info = {
628 .orig_video_lines = 30,
629 .orig_video_cols = 80,
630 .orig_video_mode = 0,
631 .orig_video_ega_bx = 0,
632 .orig_video_isVGA = 1,
633 .orig_video_points = 8
636 static int __init parse_tag_videotext(const struct tag *tag)
638 screen_info.orig_x = tag->u.videotext.x;
639 screen_info.orig_y = tag->u.videotext.y;
640 screen_info.orig_video_page = tag->u.videotext.video_page;
641 screen_info.orig_video_mode = tag->u.videotext.video_mode;
642 screen_info.orig_video_cols = tag->u.videotext.video_cols;
643 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
644 screen_info.orig_video_lines = tag->u.videotext.video_lines;
645 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
646 screen_info.orig_video_points = tag->u.videotext.video_points;
650 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
653 static int __init parse_tag_ramdisk(const struct tag *tag)
655 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
656 (tag->u.ramdisk.flags & 2) == 0,
657 tag->u.ramdisk.start, tag->u.ramdisk.size);
661 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
663 static int __init parse_tag_initrd(const struct tag *tag)
665 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
666 "please update your bootloader.\n");
667 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
668 phys_initrd_size = tag->u.initrd.size;
672 __tagtable(ATAG_INITRD, parse_tag_initrd);
674 static int __init parse_tag_initrd2(const struct tag *tag)
676 phys_initrd_start = tag->u.initrd.start;
677 phys_initrd_size = tag->u.initrd.size;
681 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
683 static int __init parse_tag_serialnr(const struct tag *tag)
685 system_serial_low = tag->u.serialnr.low;
686 system_serial_high = tag->u.serialnr.high;
690 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
692 static int __init parse_tag_revision(const struct tag *tag)
694 system_rev = tag->u.revision.rev;
698 __tagtable(ATAG_REVISION, parse_tag_revision);
700 static int __init parse_tag_cmdline(const struct tag *tag)
702 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
706 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
709 * Scan the tag table for this tag, and call its parse function.
710 * The tag table is built by the linker from all the __tagtable
713 static int __init parse_tag(const struct tag *tag)
715 extern struct tagtable __tagtable_begin, __tagtable_end;
718 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
719 if (tag->hdr.tag == t->tag) {
724 return t < &__tagtable_end;
728 * Parse all tags in the list, checking both the global and architecture
729 * specific tag tables.
731 static void __init parse_tags(const struct tag *t)
733 for (; t->hdr.size; t = tag_next(t))
736 "Ignoring unrecognised tag 0x%08x\n",
741 * This holds our defaults.
743 static struct init_tags {
744 struct tag_header hdr1;
745 struct tag_core core;
746 struct tag_header hdr2;
747 struct tag_mem32 mem;
748 struct tag_header hdr3;
749 } init_tags __initdata = {
750 { tag_size(tag_core), ATAG_CORE },
751 { 1, PAGE_SIZE, 0xff },
752 { tag_size(tag_mem32), ATAG_MEM },
753 { MEM_SIZE, PHYS_OFFSET },
757 static void (*init_machine)(void) __initdata;
759 static int __init customize_machine(void)
761 /* customizes platform devices, or adds new ones */
766 arch_initcall(customize_machine);
768 void __init setup_arch(char **cmdline_p)
770 struct tag *tags = (struct tag *)&init_tags;
771 struct machine_desc *mdesc;
772 char *from = default_command_line;
775 mdesc = setup_machine(machine_arch_type);
776 machine_name = mdesc->name;
778 if (mdesc->soft_reboot)
781 if (mdesc->boot_params)
782 tags = phys_to_virt(mdesc->boot_params);
785 * If we have the old style parameters, convert them to
788 if (tags->hdr.tag != ATAG_CORE)
789 convert_to_tag_list(tags);
790 if (tags->hdr.tag != ATAG_CORE)
791 tags = (struct tag *)&init_tags;
794 mdesc->fixup(mdesc, tags, &from, &meminfo);
796 if (tags->hdr.tag == ATAG_CORE) {
797 if (meminfo.nr_banks != 0)
798 squash_mem_tags(tags);
802 init_mm.start_code = (unsigned long) &_text;
803 init_mm.end_code = (unsigned long) &_etext;
804 init_mm.end_data = (unsigned long) &_edata;
805 init_mm.brk = (unsigned long) &_end;
807 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
808 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
809 parse_cmdline(cmdline_p, from);
810 paging_init(&meminfo, mdesc);
811 request_standard_resources(&meminfo, mdesc);
820 * Set up various architecture-specific pointers
822 init_arch_irq = mdesc->init_irq;
823 system_timer = mdesc->timer;
824 init_machine = mdesc->init_machine;
827 #if defined(CONFIG_VGA_CONSOLE)
828 conswitchp = &vga_con;
829 #elif defined(CONFIG_DUMMY_CONSOLE)
830 conswitchp = &dummy_con;
836 static int __init topology_init(void)
840 for_each_possible_cpu(cpu)
841 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
846 subsys_initcall(topology_init);
848 static const char *hwcap_str[] = {
862 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
864 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
866 seq_printf(m, "%s size\t\t: %d\n"
868 "%s line length\t: %d\n"
870 type, mult << (8 + CACHE_SIZE(cache)),
871 type, (mult << CACHE_ASSOC(cache)) >> 1,
872 type, 8 << CACHE_LINE(cache),
873 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
877 static int c_show(struct seq_file *m, void *v)
881 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
882 cpu_name, (int)processor_id & 15, elf_platform);
884 #if defined(CONFIG_SMP)
885 for_each_online_cpu(i) {
887 * glibc reads /proc/cpuinfo to determine the number of
888 * online processors, looking for lines beginning with
889 * "processor". Give glibc what it expects.
891 seq_printf(m, "processor\t: %d\n", i);
892 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
893 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
894 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
896 #else /* CONFIG_SMP */
897 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
898 loops_per_jiffy / (500000/HZ),
899 (loops_per_jiffy / (5000/HZ)) % 100);
902 /* dump out the processor features */
903 seq_puts(m, "Features\t: ");
905 for (i = 0; hwcap_str[i]; i++)
906 if (elf_hwcap & (1 << i))
907 seq_printf(m, "%s ", hwcap_str[i]);
909 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
910 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
912 if ((processor_id & 0x0008f000) == 0x00000000) {
914 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
916 if ((processor_id & 0x0008f000) == 0x00007000) {
918 seq_printf(m, "CPU variant\t: 0x%02x\n",
919 (processor_id >> 16) & 127);
922 seq_printf(m, "CPU variant\t: 0x%x\n",
923 (processor_id >> 20) & 15);
925 seq_printf(m, "CPU part\t: 0x%03x\n",
926 (processor_id >> 4) & 0xfff);
928 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
931 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
932 if (cache_info != processor_id) {
933 seq_printf(m, "Cache type\t: %s\n"
934 "Cache clean\t: %s\n"
935 "Cache lockdown\t: %s\n"
936 "Cache format\t: %s\n",
937 cache_types[CACHE_TYPE(cache_info)],
938 cache_clean[CACHE_TYPE(cache_info)],
939 cache_lockdown[CACHE_TYPE(cache_info)],
940 CACHE_S(cache_info) ? "Harvard" : "Unified");
942 if (CACHE_S(cache_info)) {
943 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
944 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
946 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
953 seq_printf(m, "Hardware\t: %s\n", machine_name);
954 seq_printf(m, "Revision\t: %04x\n", system_rev);
955 seq_printf(m, "Serial\t\t: %08x%08x\n",
956 system_serial_high, system_serial_low);
961 static void *c_start(struct seq_file *m, loff_t *pos)
963 return *pos < 1 ? (void *)1 : NULL;
966 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
972 static void c_stop(struct seq_file *m, void *v)
976 struct seq_operations cpuinfo_op = {