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>
29 #include <asm/hardware.h>
31 #include <asm/procinfo.h>
32 #include <asm/setup.h>
33 #include <asm/mach-types.h>
34 #include <asm/cacheflush.h>
35 #include <asm/tlbflush.h>
37 #include <asm/mach/arch.h>
38 #include <asm/mach/irq.h>
39 #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 unsigned int mem_fclk_21285;
58 extern void paging_init(struct meminfo *, struct machine_desc *desc);
59 extern void convert_to_tag_list(struct tag *tags);
60 extern void squash_mem_tags(struct tag *tag);
61 extern void reboot_setup(char *str);
62 extern int root_mountflags;
63 extern void _stext, _text, _etext, __data_start, _edata, _end;
65 unsigned int processor_id;
66 unsigned int __machine_arch_type;
67 EXPORT_SYMBOL(__machine_arch_type);
69 unsigned int system_rev;
70 EXPORT_SYMBOL(system_rev);
72 unsigned int system_serial_low;
73 EXPORT_SYMBOL(system_serial_low);
75 unsigned int system_serial_high;
76 EXPORT_SYMBOL(system_serial_high);
78 unsigned int elf_hwcap;
79 EXPORT_SYMBOL(elf_hwcap);
83 struct processor processor;
86 struct cpu_tlb_fns cpu_tlb;
89 struct cpu_user_fns cpu_user;
92 struct cpu_cache_fns cpu_cache;
99 } ____cacheline_aligned;
101 static struct stack stacks[NR_CPUS];
103 char elf_platform[ELF_PLATFORM_SIZE];
104 EXPORT_SYMBOL(elf_platform);
106 unsigned long phys_initrd_start __initdata = 0;
107 unsigned long phys_initrd_size __initdata = 0;
109 static struct meminfo meminfo __initdata = { 0, };
110 static const char *cpu_name;
111 static const char *machine_name;
112 static char command_line[COMMAND_LINE_SIZE];
114 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
115 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
116 #define ENDIANNESS ((char)endian_test.l)
118 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
121 * Standard memory resources
123 static struct resource mem_res[] = {
124 { "Video RAM", 0, 0, IORESOURCE_MEM },
125 { "Kernel text", 0, 0, IORESOURCE_MEM },
126 { "Kernel data", 0, 0, IORESOURCE_MEM }
129 #define video_ram mem_res[0]
130 #define kernel_code mem_res[1]
131 #define kernel_data mem_res[2]
133 static struct resource io_res[] = {
134 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
135 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
136 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
139 #define lp0 io_res[0]
140 #define lp1 io_res[1]
141 #define lp2 io_res[2]
143 static const char *cache_types[16] = {
162 static const char *cache_clean[16] = {
181 static const char *cache_lockdown[16] = {
200 static const char *proc_arch[] = {
220 #define CACHE_TYPE(x) (((x) >> 25) & 15)
221 #define CACHE_S(x) ((x) & (1 << 24))
222 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
223 #define CACHE_ISIZE(x) ((x) & 4095)
225 #define CACHE_SIZE(y) (((y) >> 6) & 7)
226 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
227 #define CACHE_M(y) ((y) & (1 << 2))
228 #define CACHE_LINE(y) ((y) & 3)
230 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
232 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
234 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
236 mult << (8 + CACHE_SIZE(cache)),
237 (mult << CACHE_ASSOC(cache)) >> 1,
238 8 << CACHE_LINE(cache),
239 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
243 static void __init dump_cpu_info(int cpu)
245 unsigned int info = read_cpuid(CPUID_CACHETYPE);
247 if (info != processor_id) {
248 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
249 cache_types[CACHE_TYPE(info)]);
251 dump_cache("I cache", cpu, CACHE_ISIZE(info));
252 dump_cache("D cache", cpu, CACHE_DSIZE(info));
254 dump_cache("cache", cpu, CACHE_ISIZE(info));
259 int cpu_architecture(void)
263 if ((processor_id & 0x0000f000) == 0) {
264 cpu_arch = CPU_ARCH_UNKNOWN;
265 } else if ((processor_id & 0x0000f000) == 0x00007000) {
266 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
268 cpu_arch = (processor_id >> 16) & 7;
270 cpu_arch += CPU_ARCH_ARMv3;
277 * These functions re-use the assembly code in head.S, which
278 * already provide the required functionality.
280 extern struct proc_info_list *lookup_processor_type(void);
281 extern struct machine_desc *lookup_machine_type(unsigned int);
283 static void __init setup_processor(void)
285 struct proc_info_list *list;
288 * locate processor in the list of supported processor
289 * types. The linker builds this table for us from the
290 * entries in arch/arm/mm/proc-*.S
292 list = lookup_processor_type();
294 printk("CPU configuration botched (ID %08x), unable "
295 "to continue.\n", processor_id);
299 cpu_name = list->cpu_name;
302 processor = *list->proc;
305 cpu_tlb = *list->tlb;
308 cpu_user = *list->user;
311 cpu_cache = *list->cache;
314 printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
315 cpu_name, processor_id, (int)processor_id & 15,
316 proc_arch[cpu_architecture()]);
318 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
319 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
320 elf_hwcap = list->elf_hwcap;
326 * cpu_init - initialise one CPU.
328 * cpu_init dumps the cache information, initialises SMP specific
329 * information, and sets up the per-CPU stacks.
333 unsigned int cpu = smp_processor_id();
334 struct stack *stk = &stacks[cpu];
336 if (cpu >= NR_CPUS) {
337 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
344 * setup stacks for re-entrant exception handlers
356 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
357 "I" (offsetof(struct stack, irq[0])),
358 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
359 "I" (offsetof(struct stack, abt[0])),
360 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
361 "I" (offsetof(struct stack, und[0])),
362 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
366 static struct machine_desc * __init setup_machine(unsigned int nr)
368 struct machine_desc *list;
371 * locate machine in the list of supported machines.
373 list = lookup_machine_type(nr);
375 printk("Machine configuration botched (nr %d), unable "
376 "to continue.\n", nr);
380 printk("Machine: %s\n", list->name);
385 static void __init early_initrd(char **p)
387 unsigned long start, size;
389 start = memparse(*p, p);
391 size = memparse((*p) + 1, p);
393 phys_initrd_start = start;
394 phys_initrd_size = size;
397 __early_param("initrd=", early_initrd);
399 static void __init add_memory(unsigned long start, unsigned long size)
402 * Ensure that start/size are aligned to a page boundary.
403 * Size is appropriately rounded down, start is rounded up.
405 size -= start & ~PAGE_MASK;
407 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
408 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
409 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
410 meminfo.nr_banks += 1;
414 * Pick out the memory size. We look for mem=size@start,
415 * where start and size are "size[KkMm]"
417 static void __init early_mem(char **p)
419 static int usermem __initdata = 0;
420 unsigned long size, start;
423 * If the user specifies memory size, we
424 * blow away any automatically generated
429 meminfo.nr_banks = 0;
433 size = memparse(*p, p);
435 start = memparse(*p + 1, p);
437 add_memory(start, size);
439 __early_param("mem=", early_mem);
442 * Initial parsing of the command line.
444 static void __init parse_cmdline(char **cmdline_p, char *from)
446 char c = ' ', *to = command_line;
451 extern struct early_params __early_begin, __early_end;
452 struct early_params *p;
454 for (p = &__early_begin; p < &__early_end; p++) {
455 int len = strlen(p->arg);
457 if (memcmp(from, p->arg, len) == 0) {
458 if (to != command_line)
463 while (*from != ' ' && *from != '\0')
472 if (COMMAND_LINE_SIZE <= ++len)
477 *cmdline_p = command_line;
481 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
483 #ifdef CONFIG_BLK_DEV_RAM
484 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
486 rd_image_start = image_start;
496 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
498 struct resource *res;
501 kernel_code.start = virt_to_phys(&_text);
502 kernel_code.end = virt_to_phys(&_etext - 1);
503 kernel_data.start = virt_to_phys(&__data_start);
504 kernel_data.end = virt_to_phys(&_end - 1);
506 for (i = 0; i < mi->nr_banks; i++) {
507 unsigned long virt_start, virt_end;
509 if (mi->bank[i].size == 0)
512 virt_start = __phys_to_virt(mi->bank[i].start);
513 virt_end = virt_start + mi->bank[i].size - 1;
515 res = alloc_bootmem_low(sizeof(*res));
516 res->name = "System RAM";
517 res->start = __virt_to_phys(virt_start);
518 res->end = __virt_to_phys(virt_end);
519 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
521 request_resource(&iomem_resource, res);
523 if (kernel_code.start >= res->start &&
524 kernel_code.end <= res->end)
525 request_resource(res, &kernel_code);
526 if (kernel_data.start >= res->start &&
527 kernel_data.end <= res->end)
528 request_resource(res, &kernel_data);
531 if (mdesc->video_start) {
532 video_ram.start = mdesc->video_start;
533 video_ram.end = mdesc->video_end;
534 request_resource(&iomem_resource, &video_ram);
538 * Some machines don't have the possibility of ever
539 * possessing lp0, lp1 or lp2
541 if (mdesc->reserve_lp0)
542 request_resource(&ioport_resource, &lp0);
543 if (mdesc->reserve_lp1)
544 request_resource(&ioport_resource, &lp1);
545 if (mdesc->reserve_lp2)
546 request_resource(&ioport_resource, &lp2);
552 * This is the new way of passing data to the kernel at boot time. Rather
553 * than passing a fixed inflexible structure to the kernel, we pass a list
554 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
555 * tag for the list to be recognised (to distinguish the tagged list from
556 * a param_struct). The list is terminated with a zero-length tag (this tag
557 * is not parsed in any way).
559 static int __init parse_tag_core(const struct tag *tag)
561 if (tag->hdr.size > 2) {
562 if ((tag->u.core.flags & 1) == 0)
563 root_mountflags &= ~MS_RDONLY;
564 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
569 __tagtable(ATAG_CORE, parse_tag_core);
571 static int __init parse_tag_mem32(const struct tag *tag)
573 if (meminfo.nr_banks >= NR_BANKS) {
575 "Ignoring memory bank 0x%08x size %dKB\n",
576 tag->u.mem.start, tag->u.mem.size / 1024);
579 add_memory(tag->u.mem.start, tag->u.mem.size);
583 __tagtable(ATAG_MEM, parse_tag_mem32);
585 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
586 struct screen_info screen_info = {
587 .orig_video_lines = 30,
588 .orig_video_cols = 80,
589 .orig_video_mode = 0,
590 .orig_video_ega_bx = 0,
591 .orig_video_isVGA = 1,
592 .orig_video_points = 8
595 static int __init parse_tag_videotext(const struct tag *tag)
597 screen_info.orig_x = tag->u.videotext.x;
598 screen_info.orig_y = tag->u.videotext.y;
599 screen_info.orig_video_page = tag->u.videotext.video_page;
600 screen_info.orig_video_mode = tag->u.videotext.video_mode;
601 screen_info.orig_video_cols = tag->u.videotext.video_cols;
602 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
603 screen_info.orig_video_lines = tag->u.videotext.video_lines;
604 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
605 screen_info.orig_video_points = tag->u.videotext.video_points;
609 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
612 static int __init parse_tag_ramdisk(const struct tag *tag)
614 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
615 (tag->u.ramdisk.flags & 2) == 0,
616 tag->u.ramdisk.start, tag->u.ramdisk.size);
620 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
622 static int __init parse_tag_initrd(const struct tag *tag)
624 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
625 "please update your bootloader.\n");
626 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
627 phys_initrd_size = tag->u.initrd.size;
631 __tagtable(ATAG_INITRD, parse_tag_initrd);
633 static int __init parse_tag_initrd2(const struct tag *tag)
635 phys_initrd_start = tag->u.initrd.start;
636 phys_initrd_size = tag->u.initrd.size;
640 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
642 static int __init parse_tag_serialnr(const struct tag *tag)
644 system_serial_low = tag->u.serialnr.low;
645 system_serial_high = tag->u.serialnr.high;
649 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
651 static int __init parse_tag_revision(const struct tag *tag)
653 system_rev = tag->u.revision.rev;
657 __tagtable(ATAG_REVISION, parse_tag_revision);
659 static int __init parse_tag_cmdline(const struct tag *tag)
661 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
665 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
668 * Scan the tag table for this tag, and call its parse function.
669 * The tag table is built by the linker from all the __tagtable
672 static int __init parse_tag(const struct tag *tag)
674 extern struct tagtable __tagtable_begin, __tagtable_end;
677 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
678 if (tag->hdr.tag == t->tag) {
683 return t < &__tagtable_end;
687 * Parse all tags in the list, checking both the global and architecture
688 * specific tag tables.
690 static void __init parse_tags(const struct tag *t)
692 for (; t->hdr.size; t = tag_next(t))
695 "Ignoring unrecognised tag 0x%08x\n",
700 * This holds our defaults.
702 static struct init_tags {
703 struct tag_header hdr1;
704 struct tag_core core;
705 struct tag_header hdr2;
706 struct tag_mem32 mem;
707 struct tag_header hdr3;
708 } init_tags __initdata = {
709 { tag_size(tag_core), ATAG_CORE },
710 { 1, PAGE_SIZE, 0xff },
711 { tag_size(tag_mem32), ATAG_MEM },
712 { MEM_SIZE, PHYS_OFFSET },
716 static void (*init_machine)(void) __initdata;
718 static int __init customize_machine(void)
720 /* customizes platform devices, or adds new ones */
725 arch_initcall(customize_machine);
727 void __init setup_arch(char **cmdline_p)
729 struct tag *tags = (struct tag *)&init_tags;
730 struct machine_desc *mdesc;
731 char *from = default_command_line;
734 mdesc = setup_machine(machine_arch_type);
735 machine_name = mdesc->name;
737 if (mdesc->soft_reboot)
740 if (mdesc->boot_params)
741 tags = phys_to_virt(mdesc->boot_params);
744 * If we have the old style parameters, convert them to
747 if (tags->hdr.tag != ATAG_CORE)
748 convert_to_tag_list(tags);
749 if (tags->hdr.tag != ATAG_CORE)
750 tags = (struct tag *)&init_tags;
753 mdesc->fixup(mdesc, tags, &from, &meminfo);
755 if (tags->hdr.tag == ATAG_CORE) {
756 if (meminfo.nr_banks != 0)
757 squash_mem_tags(tags);
761 init_mm.start_code = (unsigned long) &_text;
762 init_mm.end_code = (unsigned long) &_etext;
763 init_mm.end_data = (unsigned long) &_edata;
764 init_mm.brk = (unsigned long) &_end;
766 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
767 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
768 parse_cmdline(cmdline_p, from);
769 paging_init(&meminfo, mdesc);
770 request_standard_resources(&meminfo, mdesc);
775 * Set up various architecture-specific pointers
777 init_arch_irq = mdesc->init_irq;
778 system_timer = mdesc->timer;
779 init_machine = mdesc->init_machine;
782 #if defined(CONFIG_VGA_CONSOLE)
783 conswitchp = &vga_con;
784 #elif defined(CONFIG_DUMMY_CONSOLE)
785 conswitchp = &dummy_con;
791 static int __init topology_init(void)
796 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu, NULL);
801 subsys_initcall(topology_init);
803 static const char *hwcap_str[] = {
817 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
819 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
821 seq_printf(m, "%s size\t\t: %d\n"
823 "%s line length\t: %d\n"
825 type, mult << (8 + CACHE_SIZE(cache)),
826 type, (mult << CACHE_ASSOC(cache)) >> 1,
827 type, 8 << CACHE_LINE(cache),
828 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
832 static int c_show(struct seq_file *m, void *v)
836 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
837 cpu_name, (int)processor_id & 15, elf_platform);
839 #if defined(CONFIG_SMP)
840 for_each_online_cpu(i) {
841 seq_printf(m, "Processor\t: %d\n", i);
842 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
843 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
844 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
846 #else /* CONFIG_SMP */
847 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
848 loops_per_jiffy / (500000/HZ),
849 (loops_per_jiffy / (5000/HZ)) % 100);
852 /* dump out the processor features */
853 seq_puts(m, "Features\t: ");
855 for (i = 0; hwcap_str[i]; i++)
856 if (elf_hwcap & (1 << i))
857 seq_printf(m, "%s ", hwcap_str[i]);
859 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
860 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
862 if ((processor_id & 0x0000f000) == 0x00000000) {
864 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
866 if ((processor_id & 0x0000f000) == 0x00007000) {
868 seq_printf(m, "CPU variant\t: 0x%02x\n",
869 (processor_id >> 16) & 127);
872 seq_printf(m, "CPU variant\t: 0x%x\n",
873 (processor_id >> 20) & 15);
875 seq_printf(m, "CPU part\t: 0x%03x\n",
876 (processor_id >> 4) & 0xfff);
878 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
881 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
882 if (cache_info != processor_id) {
883 seq_printf(m, "Cache type\t: %s\n"
884 "Cache clean\t: %s\n"
885 "Cache lockdown\t: %s\n"
886 "Cache format\t: %s\n",
887 cache_types[CACHE_TYPE(cache_info)],
888 cache_clean[CACHE_TYPE(cache_info)],
889 cache_lockdown[CACHE_TYPE(cache_info)],
890 CACHE_S(cache_info) ? "Harvard" : "Unified");
892 if (CACHE_S(cache_info)) {
893 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
894 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
896 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
903 seq_printf(m, "Hardware\t: %s\n", machine_name);
904 seq_printf(m, "Revision\t: %04x\n", system_rev);
905 seq_printf(m, "Serial\t\t: %08x%08x\n",
906 system_serial_high, system_serial_low);
911 static void *c_start(struct seq_file *m, loff_t *pos)
913 return *pos < 1 ? (void *)1 : NULL;
916 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
922 static void c_stop(struct seq_file *m, void *v)
926 struct seq_operations cpuinfo_op = {