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/screen_info.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/cputype.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/cachetype.h>
36 #include <asm/tlbflush.h>
38 #include <asm/mach/arch.h>
39 #include <asm/mach/irq.h>
40 #include <asm/mach/time.h>
41 #include <asm/traps.h>
47 #define MEM_SIZE (16*1024*1024)
50 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
53 static int __init fpe_setup(char *line)
55 memcpy(fpe_type, line, 8);
59 __setup("fpe=", fpe_setup);
62 extern void paging_init(struct meminfo *, struct machine_desc *desc);
63 extern void reboot_setup(char *str);
64 extern void _text, _etext, __data_start, _edata, _end;
66 unsigned int processor_id;
67 EXPORT_SYMBOL(processor_id);
68 unsigned int __machine_arch_type;
69 EXPORT_SYMBOL(__machine_arch_type);
71 EXPORT_SYMBOL(cacheid);
73 unsigned int __atags_pointer __initdata;
75 unsigned int system_rev;
76 EXPORT_SYMBOL(system_rev);
78 unsigned int system_serial_low;
79 EXPORT_SYMBOL(system_serial_low);
81 unsigned int system_serial_high;
82 EXPORT_SYMBOL(system_serial_high);
84 unsigned int elf_hwcap;
85 EXPORT_SYMBOL(elf_hwcap);
87 unsigned long __initdata vmalloc_reserve = 128 << 20;
91 struct processor processor;
94 struct cpu_tlb_fns cpu_tlb;
97 struct cpu_user_fns cpu_user;
100 struct cpu_cache_fns cpu_cache;
102 #ifdef CONFIG_OUTER_CACHE
103 struct outer_cache_fns outer_cache;
110 } ____cacheline_aligned;
112 static struct stack stacks[NR_CPUS];
114 char elf_platform[ELF_PLATFORM_SIZE];
115 EXPORT_SYMBOL(elf_platform);
117 static struct meminfo meminfo __initdata = { 0, };
118 static const char *cpu_name;
119 static const char *machine_name;
120 static char __initdata command_line[COMMAND_LINE_SIZE];
122 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
123 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
124 #define ENDIANNESS ((char)endian_test.l)
126 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
129 * Standard memory resources
131 static struct resource mem_res[] = {
136 .flags = IORESOURCE_MEM
139 .name = "Kernel text",
142 .flags = IORESOURCE_MEM
145 .name = "Kernel data",
148 .flags = IORESOURCE_MEM
152 #define video_ram mem_res[0]
153 #define kernel_code mem_res[1]
154 #define kernel_data mem_res[2]
156 static struct resource io_res[] = {
161 .flags = IORESOURCE_IO | IORESOURCE_BUSY
167 .flags = IORESOURCE_IO | IORESOURCE_BUSY
173 .flags = IORESOURCE_IO | IORESOURCE_BUSY
177 #define lp0 io_res[0]
178 #define lp1 io_res[1]
179 #define lp2 io_res[2]
181 static const char *proc_arch[] = {
201 int cpu_architecture(void)
205 if ((read_cpuid_id() & 0x0008f000) == 0) {
206 cpu_arch = CPU_ARCH_UNKNOWN;
207 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
208 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
209 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
210 cpu_arch = (read_cpuid_id() >> 16) & 7;
212 cpu_arch += CPU_ARCH_ARMv3;
213 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
216 /* Revised CPUID format. Read the Memory Model Feature
217 * Register 0 and check for VMSAv7 or PMSAv7 */
218 asm("mrc p15, 0, %0, c0, c1, 4"
220 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
221 (mmfr0 & 0x000000f0) == 0x00000030)
222 cpu_arch = CPU_ARCH_ARMv7;
223 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
224 (mmfr0 & 0x000000f0) == 0x00000020)
225 cpu_arch = CPU_ARCH_ARMv6;
227 cpu_arch = CPU_ARCH_UNKNOWN;
229 cpu_arch = CPU_ARCH_UNKNOWN;
234 static void __init cacheid_init(void)
236 unsigned int cachetype = read_cpuid_cachetype();
237 unsigned int arch = cpu_architecture();
239 if (arch >= CPU_ARCH_ARMv7) {
240 cacheid = CACHEID_VIPT_NONALIASING;
241 if ((cachetype & (3 << 14)) == 1 << 14)
242 cacheid |= CACHEID_ASID_TAGGED;
243 } else if (arch >= CPU_ARCH_ARMv6) {
244 if (cachetype & (1 << 23))
245 cacheid = CACHEID_VIPT_ALIASING;
247 cacheid = CACHEID_VIPT_NONALIASING;
249 cacheid = CACHEID_VIVT;
252 printk("CPU: %s data cache, %s instruction cache\n",
253 cache_is_vivt() ? "VIVT" :
254 cache_is_vipt_aliasing() ? "VIPT aliasing" :
255 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
256 cache_is_vivt() ? "VIVT" :
257 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
258 cache_is_vipt_aliasing() ? "VIPT aliasing" :
259 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
263 * These functions re-use the assembly code in head.S, which
264 * already provide the required functionality.
266 extern struct proc_info_list *lookup_processor_type(unsigned int);
267 extern struct machine_desc *lookup_machine_type(unsigned int);
269 static void __init setup_processor(void)
271 struct proc_info_list *list;
274 * locate processor in the list of supported processor
275 * types. The linker builds this table for us from the
276 * entries in arch/arm/mm/proc-*.S
278 list = lookup_processor_type(read_cpuid_id());
280 printk("CPU configuration botched (ID %08x), unable "
281 "to continue.\n", read_cpuid_id());
285 cpu_name = list->cpu_name;
288 processor = *list->proc;
291 cpu_tlb = *list->tlb;
294 cpu_user = *list->user;
297 cpu_cache = *list->cache;
300 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
301 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
302 proc_arch[cpu_architecture()], cr_alignment);
304 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
305 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
306 elf_hwcap = list->elf_hwcap;
307 #ifndef CONFIG_ARM_THUMB
308 elf_hwcap &= ~HWCAP_THUMB;
316 * cpu_init - initialise one CPU.
318 * cpu_init sets up the per-CPU stacks.
322 unsigned int cpu = smp_processor_id();
323 struct stack *stk = &stacks[cpu];
325 if (cpu >= NR_CPUS) {
326 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
331 * setup stacks for re-entrant exception handlers
343 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
344 "I" (offsetof(struct stack, irq[0])),
345 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
346 "I" (offsetof(struct stack, abt[0])),
347 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
348 "I" (offsetof(struct stack, und[0])),
349 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
353 static struct machine_desc * __init setup_machine(unsigned int nr)
355 struct machine_desc *list;
358 * locate machine in the list of supported machines.
360 list = lookup_machine_type(nr);
362 printk("Machine configuration botched (nr %d), unable "
363 "to continue.\n", nr);
367 printk("Machine: %s\n", list->name);
372 static void __init arm_add_memory(unsigned long start, unsigned long size)
374 struct membank *bank;
377 * Ensure that start/size are aligned to a page boundary.
378 * Size is appropriately rounded down, start is rounded up.
380 size -= start & ~PAGE_MASK;
382 bank = &meminfo.bank[meminfo.nr_banks++];
384 bank->start = PAGE_ALIGN(start);
385 bank->size = size & PAGE_MASK;
386 bank->node = PHYS_TO_NID(start);
390 * Pick out the memory size. We look for mem=size@start,
391 * where start and size are "size[KkMm]"
393 static void __init early_mem(char **p)
395 static int usermem __initdata = 0;
396 unsigned long size, start;
399 * If the user specifies memory size, we
400 * blow away any automatically generated
405 meminfo.nr_banks = 0;
409 size = memparse(*p, p);
411 start = memparse(*p + 1, p);
413 arm_add_memory(start, size);
415 __early_param("mem=", early_mem);
418 * vmalloc=size forces the vmalloc area to be exactly 'size'
419 * bytes. This can be used to increase (or decrease) the vmalloc
420 * area - the default is 128m.
422 static void __init early_vmalloc(char **arg)
424 vmalloc_reserve = memparse(*arg, arg);
426 __early_param("vmalloc=", early_vmalloc);
429 * Initial parsing of the command line.
431 static void __init parse_cmdline(char **cmdline_p, char *from)
433 char c = ' ', *to = command_line;
438 extern struct early_params __early_begin, __early_end;
439 struct early_params *p;
441 for (p = &__early_begin; p < &__early_end; p++) {
442 int arglen = strlen(p->arg);
444 if (memcmp(from, p->arg, arglen) == 0) {
445 if (to != command_line)
450 while (*from != ' ' && *from != '\0')
459 if (COMMAND_LINE_SIZE <= ++len)
464 *cmdline_p = command_line;
468 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
470 #ifdef CONFIG_BLK_DEV_RAM
471 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
473 rd_image_start = image_start;
483 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
485 struct resource *res;
488 kernel_code.start = virt_to_phys(&_text);
489 kernel_code.end = virt_to_phys(&_etext - 1);
490 kernel_data.start = virt_to_phys(&__data_start);
491 kernel_data.end = virt_to_phys(&_end - 1);
493 for (i = 0; i < mi->nr_banks; i++) {
494 unsigned long virt_start, virt_end;
496 if (mi->bank[i].size == 0)
499 virt_start = __phys_to_virt(mi->bank[i].start);
500 virt_end = virt_start + mi->bank[i].size - 1;
502 res = alloc_bootmem_low(sizeof(*res));
503 res->name = "System RAM";
504 res->start = __virt_to_phys(virt_start);
505 res->end = __virt_to_phys(virt_end);
506 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
508 request_resource(&iomem_resource, res);
510 if (kernel_code.start >= res->start &&
511 kernel_code.end <= res->end)
512 request_resource(res, &kernel_code);
513 if (kernel_data.start >= res->start &&
514 kernel_data.end <= res->end)
515 request_resource(res, &kernel_data);
518 if (mdesc->video_start) {
519 video_ram.start = mdesc->video_start;
520 video_ram.end = mdesc->video_end;
521 request_resource(&iomem_resource, &video_ram);
525 * Some machines don't have the possibility of ever
526 * possessing lp0, lp1 or lp2
528 if (mdesc->reserve_lp0)
529 request_resource(&ioport_resource, &lp0);
530 if (mdesc->reserve_lp1)
531 request_resource(&ioport_resource, &lp1);
532 if (mdesc->reserve_lp2)
533 request_resource(&ioport_resource, &lp2);
539 * This is the new way of passing data to the kernel at boot time. Rather
540 * than passing a fixed inflexible structure to the kernel, we pass a list
541 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
542 * tag for the list to be recognised (to distinguish the tagged list from
543 * a param_struct). The list is terminated with a zero-length tag (this tag
544 * is not parsed in any way).
546 static int __init parse_tag_core(const struct tag *tag)
548 if (tag->hdr.size > 2) {
549 if ((tag->u.core.flags & 1) == 0)
550 root_mountflags &= ~MS_RDONLY;
551 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
556 __tagtable(ATAG_CORE, parse_tag_core);
558 static int __init parse_tag_mem32(const struct tag *tag)
560 if (meminfo.nr_banks >= NR_BANKS) {
562 "Ignoring memory bank 0x%08x size %dKB\n",
563 tag->u.mem.start, tag->u.mem.size / 1024);
566 arm_add_memory(tag->u.mem.start, tag->u.mem.size);
570 __tagtable(ATAG_MEM, parse_tag_mem32);
572 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
573 struct screen_info screen_info = {
574 .orig_video_lines = 30,
575 .orig_video_cols = 80,
576 .orig_video_mode = 0,
577 .orig_video_ega_bx = 0,
578 .orig_video_isVGA = 1,
579 .orig_video_points = 8
582 static int __init parse_tag_videotext(const struct tag *tag)
584 screen_info.orig_x = tag->u.videotext.x;
585 screen_info.orig_y = tag->u.videotext.y;
586 screen_info.orig_video_page = tag->u.videotext.video_page;
587 screen_info.orig_video_mode = tag->u.videotext.video_mode;
588 screen_info.orig_video_cols = tag->u.videotext.video_cols;
589 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
590 screen_info.orig_video_lines = tag->u.videotext.video_lines;
591 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
592 screen_info.orig_video_points = tag->u.videotext.video_points;
596 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
599 static int __init parse_tag_ramdisk(const struct tag *tag)
601 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
602 (tag->u.ramdisk.flags & 2) == 0,
603 tag->u.ramdisk.start, tag->u.ramdisk.size);
607 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
609 static int __init parse_tag_serialnr(const struct tag *tag)
611 system_serial_low = tag->u.serialnr.low;
612 system_serial_high = tag->u.serialnr.high;
616 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
618 static int __init parse_tag_revision(const struct tag *tag)
620 system_rev = tag->u.revision.rev;
624 __tagtable(ATAG_REVISION, parse_tag_revision);
626 static int __init parse_tag_cmdline(const struct tag *tag)
628 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
632 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
635 * Scan the tag table for this tag, and call its parse function.
636 * The tag table is built by the linker from all the __tagtable
639 static int __init parse_tag(const struct tag *tag)
641 extern struct tagtable __tagtable_begin, __tagtable_end;
644 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
645 if (tag->hdr.tag == t->tag) {
650 return t < &__tagtable_end;
654 * Parse all tags in the list, checking both the global and architecture
655 * specific tag tables.
657 static void __init parse_tags(const struct tag *t)
659 for (; t->hdr.size; t = tag_next(t))
662 "Ignoring unrecognised tag 0x%08x\n",
667 * This holds our defaults.
669 static struct init_tags {
670 struct tag_header hdr1;
671 struct tag_core core;
672 struct tag_header hdr2;
673 struct tag_mem32 mem;
674 struct tag_header hdr3;
675 } init_tags __initdata = {
676 { tag_size(tag_core), ATAG_CORE },
677 { 1, PAGE_SIZE, 0xff },
678 { tag_size(tag_mem32), ATAG_MEM },
679 { MEM_SIZE, PHYS_OFFSET },
683 static void (*init_machine)(void) __initdata;
685 static int __init customize_machine(void)
687 /* customizes platform devices, or adds new ones */
692 arch_initcall(customize_machine);
694 void __init setup_arch(char **cmdline_p)
696 struct tag *tags = (struct tag *)&init_tags;
697 struct machine_desc *mdesc;
698 char *from = default_command_line;
701 mdesc = setup_machine(machine_arch_type);
702 machine_name = mdesc->name;
704 if (mdesc->soft_reboot)
708 tags = phys_to_virt(__atags_pointer);
709 else if (mdesc->boot_params)
710 tags = phys_to_virt(mdesc->boot_params);
713 * If we have the old style parameters, convert them to
716 if (tags->hdr.tag != ATAG_CORE)
717 convert_to_tag_list(tags);
718 if (tags->hdr.tag != ATAG_CORE)
719 tags = (struct tag *)&init_tags;
722 mdesc->fixup(mdesc, tags, &from, &meminfo);
724 if (tags->hdr.tag == ATAG_CORE) {
725 if (meminfo.nr_banks != 0)
726 squash_mem_tags(tags);
731 init_mm.start_code = (unsigned long) &_text;
732 init_mm.end_code = (unsigned long) &_etext;
733 init_mm.end_data = (unsigned long) &_edata;
734 init_mm.brk = (unsigned long) &_end;
736 memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
737 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
738 parse_cmdline(cmdline_p, from);
739 paging_init(&meminfo, mdesc);
740 request_standard_resources(&meminfo, mdesc);
749 * Set up various architecture-specific pointers
751 init_arch_irq = mdesc->init_irq;
752 system_timer = mdesc->timer;
753 init_machine = mdesc->init_machine;
756 #if defined(CONFIG_VGA_CONSOLE)
757 conswitchp = &vga_con;
758 #elif defined(CONFIG_DUMMY_CONSOLE)
759 conswitchp = &dummy_con;
766 static int __init topology_init(void)
770 for_each_possible_cpu(cpu) {
771 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
772 cpuinfo->cpu.hotpluggable = 1;
773 register_cpu(&cpuinfo->cpu, cpu);
779 subsys_initcall(topology_init);
781 static const char *hwcap_str[] = {
796 static int c_show(struct seq_file *m, void *v)
800 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
801 cpu_name, read_cpuid_id() & 15, elf_platform);
803 #if defined(CONFIG_SMP)
804 for_each_online_cpu(i) {
806 * glibc reads /proc/cpuinfo to determine the number of
807 * online processors, looking for lines beginning with
808 * "processor". Give glibc what it expects.
810 seq_printf(m, "processor\t: %d\n", i);
811 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
812 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
813 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
815 #else /* CONFIG_SMP */
816 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
817 loops_per_jiffy / (500000/HZ),
818 (loops_per_jiffy / (5000/HZ)) % 100);
821 /* dump out the processor features */
822 seq_puts(m, "Features\t: ");
824 for (i = 0; hwcap_str[i]; i++)
825 if (elf_hwcap & (1 << i))
826 seq_printf(m, "%s ", hwcap_str[i]);
828 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
829 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
831 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
833 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
835 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
837 seq_printf(m, "CPU variant\t: 0x%02x\n",
838 (read_cpuid_id() >> 16) & 127);
841 seq_printf(m, "CPU variant\t: 0x%x\n",
842 (read_cpuid_id() >> 20) & 15);
844 seq_printf(m, "CPU part\t: 0x%03x\n",
845 (read_cpuid_id() >> 4) & 0xfff);
847 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
851 seq_printf(m, "Hardware\t: %s\n", machine_name);
852 seq_printf(m, "Revision\t: %04x\n", system_rev);
853 seq_printf(m, "Serial\t\t: %08x%08x\n",
854 system_serial_high, system_serial_low);
859 static void *c_start(struct seq_file *m, loff_t *pos)
861 return *pos < 1 ? (void *)1 : NULL;
864 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
870 static void c_stop(struct seq_file *m, void *v)
874 const struct seq_operations cpuinfo_op = {