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>
27 #include <asm/hardware.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>
39 #define MEM_SIZE (16*1024*1024)
42 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
45 static int __init fpe_setup(char *line)
47 memcpy(fpe_type, line, 8);
51 __setup("fpe=", fpe_setup);
54 extern unsigned int mem_fclk_21285;
55 extern void paging_init(struct meminfo *, struct machine_desc *desc);
56 extern void convert_to_tag_list(struct tag *tags);
57 extern void squash_mem_tags(struct tag *tag);
58 extern void bootmem_init(struct meminfo *);
59 extern void reboot_setup(char *str);
60 extern int root_mountflags;
61 extern int _stext, _text, _etext, _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;
93 unsigned char aux_device_present;
95 char elf_platform[ELF_PLATFORM_SIZE];
96 EXPORT_SYMBOL(elf_platform);
98 char saved_command_line[COMMAND_LINE_SIZE];
99 unsigned long phys_initrd_start __initdata = 0;
100 unsigned long phys_initrd_size __initdata = 0;
102 static struct meminfo meminfo __initdata = { 0, };
103 static const char *cpu_name;
104 static const char *machine_name;
105 static char command_line[COMMAND_LINE_SIZE];
107 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
108 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
109 #define ENDIANNESS ((char)endian_test.l)
112 * Standard memory resources
114 static struct resource mem_res[] = {
115 { "Video RAM", 0, 0, IORESOURCE_MEM },
116 { "Kernel code", 0, 0, IORESOURCE_MEM },
117 { "Kernel data", 0, 0, IORESOURCE_MEM }
120 #define video_ram mem_res[0]
121 #define kernel_code mem_res[1]
122 #define kernel_data mem_res[2]
124 static struct resource io_res[] = {
125 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
126 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
127 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
130 #define lp0 io_res[0]
131 #define lp1 io_res[1]
132 #define lp2 io_res[2]
134 static const char *cache_types[16] = {
135 "VIVT write-through",
153 static const char *cache_clean[16] = {
172 static const char *cache_lockdown[16] = {
191 static const char *proc_arch[] = {
211 #define CACHE_TYPE(x) (((x) >> 25) & 15)
212 #define CACHE_S(x) ((x) & (1 << 24))
213 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
214 #define CACHE_ISIZE(x) ((x) & 4095)
216 #define CACHE_SIZE(y) (((y) >> 6) & 7)
217 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
218 #define CACHE_M(y) ((y) & (1 << 2))
219 #define CACHE_LINE(y) ((y) & 3)
221 static inline void dump_cache(const char *prefix, unsigned int cache)
223 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
225 printk("%s: %d bytes, associativity %d, %d byte lines, %d sets\n",
227 mult << (8 + CACHE_SIZE(cache)),
228 (mult << CACHE_ASSOC(cache)) >> 1,
229 8 << CACHE_LINE(cache),
230 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
234 static void __init dump_cpu_info(void)
236 unsigned int info = read_cpuid(CPUID_CACHETYPE);
238 if (info != processor_id) {
239 printk("CPU: D %s cache\n", cache_types[CACHE_TYPE(info)]);
241 dump_cache("CPU: I cache", CACHE_ISIZE(info));
242 dump_cache("CPU: D cache", CACHE_DSIZE(info));
244 dump_cache("CPU: cache", CACHE_ISIZE(info));
249 int cpu_architecture(void)
253 if ((processor_id & 0x0000f000) == 0) {
254 cpu_arch = CPU_ARCH_UNKNOWN;
255 } else if ((processor_id & 0x0000f000) == 0x00007000) {
256 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
258 cpu_arch = (processor_id >> 16) & 15;
260 cpu_arch += CPU_ARCH_ARMv3;
266 static void __init setup_processor(void)
268 extern struct proc_info_list __proc_info_begin, __proc_info_end;
269 struct proc_info_list *list;
272 * locate processor in the list of supported processor
273 * types. The linker builds this table for us from the
274 * entries in arch/arm/mm/proc-*.S
276 for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
277 if ((processor_id & list->cpu_mask) == list->cpu_val)
281 * If processor type is unrecognised, then we
284 if (list >= &__proc_info_end) {
285 printk("CPU configuration botched (ID %08x), unable "
286 "to continue.\n", processor_id);
290 cpu_name = list->cpu_name;
293 processor = *list->proc;
296 cpu_tlb = *list->tlb;
299 cpu_user = *list->user;
302 cpu_cache = *list->cache;
305 printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
306 cpu_name, processor_id, (int)processor_id & 15,
307 proc_arch[cpu_architecture()]);
311 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
312 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
313 elf_hwcap = list->elf_hwcap;
318 static struct machine_desc * __init setup_machine(unsigned int nr)
320 extern struct machine_desc __arch_info_begin, __arch_info_end;
321 struct machine_desc *list;
324 * locate architecture in the list of supported architectures.
326 for (list = &__arch_info_begin; list < &__arch_info_end; list++)
331 * If the architecture type is not recognised, then we
334 if (list >= &__arch_info_end) {
335 printk("Architecture configuration botched (nr %d), unable "
336 "to continue.\n", nr);
340 printk("Machine: %s\n", list->name);
345 static void __init early_initrd(char **p)
347 unsigned long start, size;
349 start = memparse(*p, p);
351 size = memparse((*p) + 1, p);
353 phys_initrd_start = start;
354 phys_initrd_size = size;
357 __early_param("initrd=", early_initrd);
360 * Pick out the memory size. We look for mem=size@start,
361 * where start and size are "size[KkMm]"
363 static void __init early_mem(char **p)
365 static int usermem __initdata = 0;
366 unsigned long size, start;
369 * If the user specifies memory size, we
370 * blow away any automatically generated
375 meminfo.nr_banks = 0;
379 size = memparse(*p, p);
381 start = memparse(*p + 1, p);
383 meminfo.bank[meminfo.nr_banks].start = start;
384 meminfo.bank[meminfo.nr_banks].size = size;
385 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
386 meminfo.nr_banks += 1;
388 __early_param("mem=", early_mem);
391 * Initial parsing of the command line.
393 static void __init parse_cmdline(char **cmdline_p, char *from)
395 char c = ' ', *to = command_line;
400 extern struct early_params __early_begin, __early_end;
401 struct early_params *p;
403 for (p = &__early_begin; p < &__early_end; p++) {
404 int len = strlen(p->arg);
406 if (memcmp(from, p->arg, len) == 0) {
407 if (to != command_line)
412 while (*from != ' ' && *from != '\0')
421 if (COMMAND_LINE_SIZE <= ++len)
426 *cmdline_p = command_line;
430 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
432 #ifdef CONFIG_BLK_DEV_RAM
433 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
435 rd_image_start = image_start;
445 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
447 struct resource *res;
450 kernel_code.start = __virt_to_phys(init_mm.start_code);
451 kernel_code.end = __virt_to_phys(init_mm.end_code - 1);
452 kernel_data.start = __virt_to_phys(init_mm.end_code);
453 kernel_data.end = __virt_to_phys(init_mm.brk - 1);
455 for (i = 0; i < mi->nr_banks; i++) {
456 unsigned long virt_start, virt_end;
458 if (mi->bank[i].size == 0)
461 virt_start = __phys_to_virt(mi->bank[i].start);
462 virt_end = virt_start + mi->bank[i].size - 1;
464 res = alloc_bootmem_low(sizeof(*res));
465 res->name = "System RAM";
466 res->start = __virt_to_phys(virt_start);
467 res->end = __virt_to_phys(virt_end);
468 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
470 request_resource(&iomem_resource, res);
472 if (kernel_code.start >= res->start &&
473 kernel_code.end <= res->end)
474 request_resource(res, &kernel_code);
475 if (kernel_data.start >= res->start &&
476 kernel_data.end <= res->end)
477 request_resource(res, &kernel_data);
480 if (mdesc->video_start) {
481 video_ram.start = mdesc->video_start;
482 video_ram.end = mdesc->video_end;
483 request_resource(&iomem_resource, &video_ram);
487 * Some machines don't have the possibility of ever
488 * possessing lp0, lp1 or lp2
490 if (mdesc->reserve_lp0)
491 request_resource(&ioport_resource, &lp0);
492 if (mdesc->reserve_lp1)
493 request_resource(&ioport_resource, &lp1);
494 if (mdesc->reserve_lp2)
495 request_resource(&ioport_resource, &lp2);
501 * This is the new way of passing data to the kernel at boot time. Rather
502 * than passing a fixed inflexible structure to the kernel, we pass a list
503 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
504 * tag for the list to be recognised (to distinguish the tagged list from
505 * a param_struct). The list is terminated with a zero-length tag (this tag
506 * is not parsed in any way).
508 static int __init parse_tag_core(const struct tag *tag)
510 if (tag->hdr.size > 2) {
511 if ((tag->u.core.flags & 1) == 0)
512 root_mountflags &= ~MS_RDONLY;
513 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
518 __tagtable(ATAG_CORE, parse_tag_core);
520 static int __init parse_tag_mem32(const struct tag *tag)
522 if (meminfo.nr_banks >= NR_BANKS) {
524 "Ignoring memory bank 0x%08x size %dKB\n",
525 tag->u.mem.start, tag->u.mem.size / 1024);
528 meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
529 meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size;
530 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start);
531 meminfo.nr_banks += 1;
536 __tagtable(ATAG_MEM, parse_tag_mem32);
538 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
539 struct screen_info screen_info = {
540 .orig_video_lines = 30,
541 .orig_video_cols = 80,
542 .orig_video_mode = 0,
543 .orig_video_ega_bx = 0,
544 .orig_video_isVGA = 1,
545 .orig_video_points = 8
548 static int __init parse_tag_videotext(const struct tag *tag)
550 screen_info.orig_x = tag->u.videotext.x;
551 screen_info.orig_y = tag->u.videotext.y;
552 screen_info.orig_video_page = tag->u.videotext.video_page;
553 screen_info.orig_video_mode = tag->u.videotext.video_mode;
554 screen_info.orig_video_cols = tag->u.videotext.video_cols;
555 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
556 screen_info.orig_video_lines = tag->u.videotext.video_lines;
557 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
558 screen_info.orig_video_points = tag->u.videotext.video_points;
562 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
565 static int __init parse_tag_ramdisk(const struct tag *tag)
567 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
568 (tag->u.ramdisk.flags & 2) == 0,
569 tag->u.ramdisk.start, tag->u.ramdisk.size);
573 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
575 static int __init parse_tag_initrd(const struct tag *tag)
577 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
578 "please update your bootloader.\n");
579 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
580 phys_initrd_size = tag->u.initrd.size;
584 __tagtable(ATAG_INITRD, parse_tag_initrd);
586 static int __init parse_tag_initrd2(const struct tag *tag)
588 phys_initrd_start = tag->u.initrd.start;
589 phys_initrd_size = tag->u.initrd.size;
593 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
595 static int __init parse_tag_serialnr(const struct tag *tag)
597 system_serial_low = tag->u.serialnr.low;
598 system_serial_high = tag->u.serialnr.high;
602 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
604 static int __init parse_tag_revision(const struct tag *tag)
606 system_rev = tag->u.revision.rev;
610 __tagtable(ATAG_REVISION, parse_tag_revision);
612 static int __init parse_tag_cmdline(const struct tag *tag)
614 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
618 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
621 * Scan the tag table for this tag, and call its parse function.
622 * The tag table is built by the linker from all the __tagtable
625 static int __init parse_tag(const struct tag *tag)
627 extern struct tagtable __tagtable_begin, __tagtable_end;
630 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
631 if (tag->hdr.tag == t->tag) {
636 return t < &__tagtable_end;
640 * Parse all tags in the list, checking both the global and architecture
641 * specific tag tables.
643 static void __init parse_tags(const struct tag *t)
645 for (; t->hdr.size; t = tag_next(t))
648 "Ignoring unrecognised tag 0x%08x\n",
653 * This holds our defaults.
655 static struct init_tags {
656 struct tag_header hdr1;
657 struct tag_core core;
658 struct tag_header hdr2;
659 struct tag_mem32 mem;
660 struct tag_header hdr3;
661 } init_tags __initdata = {
662 { tag_size(tag_core), ATAG_CORE },
663 { 1, PAGE_SIZE, 0xff },
664 { tag_size(tag_mem32), ATAG_MEM },
665 { MEM_SIZE, PHYS_OFFSET },
669 static void (*init_machine)(void) __initdata;
671 static int __init customize_machine(void)
673 /* customizes platform devices, or adds new ones */
678 arch_initcall(customize_machine);
680 void __init setup_arch(char **cmdline_p)
682 struct tag *tags = (struct tag *)&init_tags;
683 struct machine_desc *mdesc;
684 char *from = default_command_line;
687 mdesc = setup_machine(machine_arch_type);
688 machine_name = mdesc->name;
690 if (mdesc->soft_reboot)
693 if (mdesc->param_offset)
694 tags = phys_to_virt(mdesc->param_offset);
697 * If we have the old style parameters, convert them to
700 if (tags->hdr.tag != ATAG_CORE)
701 convert_to_tag_list(tags);
702 if (tags->hdr.tag != ATAG_CORE)
703 tags = (struct tag *)&init_tags;
706 mdesc->fixup(mdesc, tags, &from, &meminfo);
708 if (tags->hdr.tag == ATAG_CORE) {
709 if (meminfo.nr_banks != 0)
710 squash_mem_tags(tags);
714 init_mm.start_code = (unsigned long) &_text;
715 init_mm.end_code = (unsigned long) &_etext;
716 init_mm.end_data = (unsigned long) &_edata;
717 init_mm.brk = (unsigned long) &_end;
719 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
720 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
721 parse_cmdline(cmdline_p, from);
722 bootmem_init(&meminfo);
723 paging_init(&meminfo, mdesc);
724 request_standard_resources(&meminfo, mdesc);
727 * Set up various architecture-specific pointers
729 init_arch_irq = mdesc->init_irq;
730 init_machine = mdesc->init_machine;
733 #if defined(CONFIG_VGA_CONSOLE)
734 conswitchp = &vga_con;
735 #elif defined(CONFIG_DUMMY_CONSOLE)
736 conswitchp = &dummy_con;
741 static struct cpu cpu[1];
743 static int __init topology_init(void)
745 return register_cpu(cpu, 0, NULL);
748 subsys_initcall(topology_init);
750 static const char *hwcap_str[] = {
763 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
765 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
767 seq_printf(m, "%s size\t\t: %d\n"
769 "%s line length\t: %d\n"
771 type, mult << (8 + CACHE_SIZE(cache)),
772 type, (mult << CACHE_ASSOC(cache)) >> 1,
773 type, 8 << CACHE_LINE(cache),
774 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
778 static int c_show(struct seq_file *m, void *v)
782 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
783 cpu_name, (int)processor_id & 15, elf_platform);
785 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
786 loops_per_jiffy / (500000/HZ),
787 (loops_per_jiffy / (5000/HZ)) % 100);
789 /* dump out the processor features */
790 seq_puts(m, "Features\t: ");
792 for (i = 0; hwcap_str[i]; i++)
793 if (elf_hwcap & (1 << i))
794 seq_printf(m, "%s ", hwcap_str[i]);
796 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
797 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
799 if ((processor_id & 0x0000f000) == 0x00000000) {
801 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
803 if ((processor_id & 0x0000f000) == 0x00007000) {
805 seq_printf(m, "CPU variant\t: 0x%02x\n",
806 (processor_id >> 16) & 127);
809 seq_printf(m, "CPU variant\t: 0x%x\n",
810 (processor_id >> 20) & 15);
812 seq_printf(m, "CPU part\t: 0x%03x\n",
813 (processor_id >> 4) & 0xfff);
815 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
818 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
819 if (cache_info != processor_id) {
820 seq_printf(m, "Cache type\t: %s\n"
821 "Cache clean\t: %s\n"
822 "Cache lockdown\t: %s\n"
823 "Cache format\t: %s\n",
824 cache_types[CACHE_TYPE(cache_info)],
825 cache_clean[CACHE_TYPE(cache_info)],
826 cache_lockdown[CACHE_TYPE(cache_info)],
827 CACHE_S(cache_info) ? "Harvard" : "Unified");
829 if (CACHE_S(cache_info)) {
830 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
831 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
833 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
840 seq_printf(m, "Hardware\t: %s\n", machine_name);
841 seq_printf(m, "Revision\t: %04x\n", system_rev);
842 seq_printf(m, "Serial\t\t: %08x%08x\n",
843 system_serial_high, system_serial_low);
848 static void *c_start(struct seq_file *m, loff_t *pos)
850 return *pos < 1 ? (void *)1 : NULL;
853 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
859 static void c_stop(struct seq_file *m, void *v)
863 struct seq_operations cpuinfo_op = {