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>
28 #include <asm/unified.h>
30 #include <asm/cputype.h>
32 #include <asm/procinfo.h>
33 #include <asm/sections.h>
34 #include <asm/setup.h>
35 #include <asm/mach-types.h>
36 #include <asm/cacheflush.h>
37 #include <asm/cachetype.h>
38 #include <asm/tlbflush.h>
40 #include <asm/mach/arch.h>
41 #include <asm/mach/irq.h>
42 #include <asm/mach/time.h>
43 #include <asm/traps.h>
44 #include <asm/unwind.h>
51 #define MEM_SIZE (16*1024*1024)
54 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
57 static int __init fpe_setup(char *line)
59 memcpy(fpe_type, line, 8);
63 __setup("fpe=", fpe_setup);
66 extern void paging_init(struct machine_desc *desc);
67 extern void reboot_setup(char *str);
69 unsigned int processor_id;
70 EXPORT_SYMBOL(processor_id);
71 unsigned int __machine_arch_type;
72 EXPORT_SYMBOL(__machine_arch_type);
74 EXPORT_SYMBOL(cacheid);
76 unsigned int __atags_pointer __initdata;
78 unsigned int system_rev;
79 EXPORT_SYMBOL(system_rev);
81 unsigned int system_serial_low;
82 EXPORT_SYMBOL(system_serial_low);
84 unsigned int system_serial_high;
85 EXPORT_SYMBOL(system_serial_high);
87 unsigned int elf_hwcap;
88 EXPORT_SYMBOL(elf_hwcap);
92 struct processor processor;
95 struct cpu_tlb_fns cpu_tlb;
98 struct cpu_user_fns cpu_user;
101 struct cpu_cache_fns cpu_cache;
103 #ifdef CONFIG_OUTER_CACHE
104 struct outer_cache_fns outer_cache;
105 EXPORT_SYMBOL(outer_cache);
112 } ____cacheline_aligned;
114 static struct stack stacks[NR_CPUS];
116 char elf_platform[ELF_PLATFORM_SIZE];
117 EXPORT_SYMBOL(elf_platform);
119 static const char *cpu_name;
120 static const char *machine_name;
121 static char __initdata command_line[COMMAND_LINE_SIZE];
123 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
124 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
125 #define ENDIANNESS ((char)endian_test.l)
127 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
130 * Standard memory resources
132 static struct resource mem_res[] = {
137 .flags = IORESOURCE_MEM
140 .name = "Kernel text",
143 .flags = IORESOURCE_MEM
146 .name = "Kernel data",
149 .flags = IORESOURCE_MEM
153 #define video_ram mem_res[0]
154 #define kernel_code mem_res[1]
155 #define kernel_data mem_res[2]
157 static struct resource io_res[] = {
162 .flags = IORESOURCE_IO | IORESOURCE_BUSY
168 .flags = IORESOURCE_IO | IORESOURCE_BUSY
174 .flags = IORESOURCE_IO | IORESOURCE_BUSY
178 #define lp0 io_res[0]
179 #define lp1 io_res[1]
180 #define lp2 io_res[2]
182 static const char *proc_arch[] = {
202 int cpu_architecture(void)
206 if ((read_cpuid_id() & 0x0008f000) == 0) {
207 cpu_arch = CPU_ARCH_UNKNOWN;
208 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
209 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
210 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
211 cpu_arch = (read_cpuid_id() >> 16) & 7;
213 cpu_arch += CPU_ARCH_ARMv3;
214 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
217 /* Revised CPUID format. Read the Memory Model Feature
218 * Register 0 and check for VMSAv7 or PMSAv7 */
219 asm("mrc p15, 0, %0, c0, c1, 4"
221 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
222 (mmfr0 & 0x000000f0) == 0x00000030)
223 cpu_arch = CPU_ARCH_ARMv7;
224 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
225 (mmfr0 & 0x000000f0) == 0x00000020)
226 cpu_arch = CPU_ARCH_ARMv6;
228 cpu_arch = CPU_ARCH_UNKNOWN;
230 cpu_arch = CPU_ARCH_UNKNOWN;
235 static void __init cacheid_init(void)
237 unsigned int cachetype = read_cpuid_cachetype();
238 unsigned int arch = cpu_architecture();
240 if (arch >= CPU_ARCH_ARMv6) {
241 if ((cachetype & (7 << 29)) == 4 << 29) {
242 /* ARMv7 register format */
243 cacheid = CACHEID_VIPT_NONALIASING;
244 if ((cachetype & (3 << 14)) == 1 << 14)
245 cacheid |= CACHEID_ASID_TAGGED;
246 } else if (cachetype & (1 << 23))
247 cacheid = CACHEID_VIPT_ALIASING;
249 cacheid = CACHEID_VIPT_NONALIASING;
251 cacheid = CACHEID_VIVT;
254 printk("CPU: %s data cache, %s instruction cache\n",
255 cache_is_vivt() ? "VIVT" :
256 cache_is_vipt_aliasing() ? "VIPT aliasing" :
257 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
258 cache_is_vivt() ? "VIVT" :
259 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
260 cache_is_vipt_aliasing() ? "VIPT aliasing" :
261 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
265 * These functions re-use the assembly code in head.S, which
266 * already provide the required functionality.
268 extern struct proc_info_list *lookup_processor_type(unsigned int);
269 extern struct machine_desc *lookup_machine_type(unsigned int);
271 static void __init setup_processor(void)
273 struct proc_info_list *list;
276 * locate processor in the list of supported processor
277 * types. The linker builds this table for us from the
278 * entries in arch/arm/mm/proc-*.S
280 list = lookup_processor_type(read_cpuid_id());
282 printk("CPU configuration botched (ID %08x), unable "
283 "to continue.\n", read_cpuid_id());
287 cpu_name = list->cpu_name;
290 processor = *list->proc;
293 cpu_tlb = *list->tlb;
296 cpu_user = *list->user;
299 cpu_cache = *list->cache;
302 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
303 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
304 proc_arch[cpu_architecture()], cr_alignment);
306 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
307 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
308 elf_hwcap = list->elf_hwcap;
309 #ifndef CONFIG_ARM_THUMB
310 elf_hwcap &= ~HWCAP_THUMB;
318 * cpu_init - initialise one CPU.
320 * cpu_init sets up the per-CPU stacks.
324 unsigned int cpu = smp_processor_id();
325 struct stack *stk = &stacks[cpu];
327 if (cpu >= NR_CPUS) {
328 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
333 * Define the placement constraint for the inline asm directive below.
334 * In Thumb-2, msr with an immediate value is not allowed.
336 #ifdef CONFIG_THUMB2_KERNEL
343 * setup stacks for re-entrant exception handlers
347 "add r14, %0, %2\n\t"
350 "add r14, %0, %4\n\t"
353 "add r14, %0, %6\n\t"
358 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
359 "I" (offsetof(struct stack, irq[0])),
360 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
361 "I" (offsetof(struct stack, abt[0])),
362 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
363 "I" (offsetof(struct stack, und[0])),
364 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
368 static struct machine_desc * __init setup_machine(unsigned int nr)
370 struct machine_desc *list;
373 * locate machine in the list of supported machines.
375 list = lookup_machine_type(nr);
377 printk("Machine configuration botched (nr %d), unable "
378 "to continue.\n", nr);
382 printk("Machine: %s\n", list->name);
387 static int __init arm_add_memory(unsigned long start, unsigned long size)
389 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
391 if (meminfo.nr_banks >= NR_BANKS) {
392 printk(KERN_CRIT "NR_BANKS too low, "
393 "ignoring memory at %#lx\n", start);
398 * Ensure that start/size are aligned to a page boundary.
399 * Size is appropriately rounded down, start is rounded up.
401 size -= start & ~PAGE_MASK;
402 bank->start = PAGE_ALIGN(start);
403 bank->size = size & PAGE_MASK;
404 bank->node = PHYS_TO_NID(start);
407 * Check whether this memory region has non-zero size or
408 * invalid node number.
410 if (bank->size == 0 || bank->node >= MAX_NUMNODES)
418 * Pick out the memory size. We look for mem=size@start,
419 * where start and size are "size[KkMm]"
421 static void __init early_mem(char **p)
423 static int usermem __initdata = 0;
424 unsigned long size, start;
427 * If the user specifies memory size, we
428 * blow away any automatically generated
433 meminfo.nr_banks = 0;
437 size = memparse(*p, p);
439 start = memparse(*p + 1, p);
441 arm_add_memory(start, size);
443 __early_param("mem=", early_mem);
446 * Initial parsing of the command line.
448 static void __init parse_cmdline(char **cmdline_p, char *from)
450 char c = ' ', *to = command_line;
455 extern struct early_params __early_begin, __early_end;
456 struct early_params *p;
458 for (p = &__early_begin; p < &__early_end; p++) {
459 int arglen = strlen(p->arg);
461 if (memcmp(from, p->arg, arglen) == 0) {
462 if (to != command_line)
467 while (*from != ' ' && *from != '\0')
476 if (COMMAND_LINE_SIZE <= ++len)
481 *cmdline_p = command_line;
485 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
487 #ifdef CONFIG_BLK_DEV_RAM
488 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
490 rd_image_start = image_start;
500 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
502 struct resource *res;
505 kernel_code.start = virt_to_phys(_text);
506 kernel_code.end = virt_to_phys(_etext - 1);
507 kernel_data.start = virt_to_phys(_data);
508 kernel_data.end = virt_to_phys(_end - 1);
510 for (i = 0; i < mi->nr_banks; i++) {
511 if (mi->bank[i].size == 0)
514 res = alloc_bootmem_low(sizeof(*res));
515 res->name = "System RAM";
516 res->start = mi->bank[i].start;
517 res->end = mi->bank[i].start + mi->bank[i].size - 1;
518 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
520 request_resource(&iomem_resource, res);
522 if (kernel_code.start >= res->start &&
523 kernel_code.end <= res->end)
524 request_resource(res, &kernel_code);
525 if (kernel_data.start >= res->start &&
526 kernel_data.end <= res->end)
527 request_resource(res, &kernel_data);
530 if (mdesc->video_start) {
531 video_ram.start = mdesc->video_start;
532 video_ram.end = mdesc->video_end;
533 request_resource(&iomem_resource, &video_ram);
537 * Some machines don't have the possibility of ever
538 * possessing lp0, lp1 or lp2
540 if (mdesc->reserve_lp0)
541 request_resource(&ioport_resource, &lp0);
542 if (mdesc->reserve_lp1)
543 request_resource(&ioport_resource, &lp1);
544 if (mdesc->reserve_lp2)
545 request_resource(&ioport_resource, &lp2);
551 * This is the new way of passing data to the kernel at boot time. Rather
552 * than passing a fixed inflexible structure to the kernel, we pass a list
553 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
554 * tag for the list to be recognised (to distinguish the tagged list from
555 * a param_struct). The list is terminated with a zero-length tag (this tag
556 * is not parsed in any way).
558 static int __init parse_tag_core(const struct tag *tag)
560 if (tag->hdr.size > 2) {
561 if ((tag->u.core.flags & 1) == 0)
562 root_mountflags &= ~MS_RDONLY;
563 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
568 __tagtable(ATAG_CORE, parse_tag_core);
570 static int __init parse_tag_mem32(const struct tag *tag)
572 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
575 __tagtable(ATAG_MEM, parse_tag_mem32);
577 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
578 struct screen_info screen_info = {
579 .orig_video_lines = 30,
580 .orig_video_cols = 80,
581 .orig_video_mode = 0,
582 .orig_video_ega_bx = 0,
583 .orig_video_isVGA = 1,
584 .orig_video_points = 8
587 static int __init parse_tag_videotext(const struct tag *tag)
589 screen_info.orig_x = tag->u.videotext.x;
590 screen_info.orig_y = tag->u.videotext.y;
591 screen_info.orig_video_page = tag->u.videotext.video_page;
592 screen_info.orig_video_mode = tag->u.videotext.video_mode;
593 screen_info.orig_video_cols = tag->u.videotext.video_cols;
594 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
595 screen_info.orig_video_lines = tag->u.videotext.video_lines;
596 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
597 screen_info.orig_video_points = tag->u.videotext.video_points;
601 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
604 static int __init parse_tag_ramdisk(const struct tag *tag)
606 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
607 (tag->u.ramdisk.flags & 2) == 0,
608 tag->u.ramdisk.start, tag->u.ramdisk.size);
612 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
614 static int __init parse_tag_serialnr(const struct tag *tag)
616 system_serial_low = tag->u.serialnr.low;
617 system_serial_high = tag->u.serialnr.high;
621 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
623 static int __init parse_tag_revision(const struct tag *tag)
625 system_rev = tag->u.revision.rev;
629 __tagtable(ATAG_REVISION, parse_tag_revision);
631 static int __init parse_tag_cmdline(const struct tag *tag)
633 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
637 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
640 * Scan the tag table for this tag, and call its parse function.
641 * The tag table is built by the linker from all the __tagtable
644 static int __init parse_tag(const struct tag *tag)
646 extern struct tagtable __tagtable_begin, __tagtable_end;
649 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
650 if (tag->hdr.tag == t->tag) {
655 return t < &__tagtable_end;
659 * Parse all tags in the list, checking both the global and architecture
660 * specific tag tables.
662 static void __init parse_tags(const struct tag *t)
664 for (; t->hdr.size; t = tag_next(t))
667 "Ignoring unrecognised tag 0x%08x\n",
672 * This holds our defaults.
674 static struct init_tags {
675 struct tag_header hdr1;
676 struct tag_core core;
677 struct tag_header hdr2;
678 struct tag_mem32 mem;
679 struct tag_header hdr3;
680 } init_tags __initdata = {
681 { tag_size(tag_core), ATAG_CORE },
682 { 1, PAGE_SIZE, 0xff },
683 { tag_size(tag_mem32), ATAG_MEM },
684 { MEM_SIZE, PHYS_OFFSET },
688 static void (*init_machine)(void) __initdata;
690 static int __init customize_machine(void)
692 /* customizes platform devices, or adds new ones */
697 arch_initcall(customize_machine);
699 void __init setup_arch(char **cmdline_p)
701 struct tag *tags = (struct tag *)&init_tags;
702 struct machine_desc *mdesc;
703 char *from = default_command_line;
708 mdesc = setup_machine(machine_arch_type);
709 machine_name = mdesc->name;
711 if (mdesc->soft_reboot)
715 tags = phys_to_virt(__atags_pointer);
716 else if (mdesc->boot_params)
717 tags = phys_to_virt(mdesc->boot_params);
720 * If we have the old style parameters, convert them to
723 if (tags->hdr.tag != ATAG_CORE)
724 convert_to_tag_list(tags);
725 if (tags->hdr.tag != ATAG_CORE)
726 tags = (struct tag *)&init_tags;
729 mdesc->fixup(mdesc, tags, &from, &meminfo);
731 if (tags->hdr.tag == ATAG_CORE) {
732 if (meminfo.nr_banks != 0)
733 squash_mem_tags(tags);
738 init_mm.start_code = (unsigned long) _text;
739 init_mm.end_code = (unsigned long) _etext;
740 init_mm.end_data = (unsigned long) _edata;
741 init_mm.brk = (unsigned long) _end;
743 memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
744 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
745 parse_cmdline(cmdline_p, from);
747 request_standard_resources(&meminfo, mdesc);
757 * Set up various architecture-specific pointers
759 init_arch_irq = mdesc->init_irq;
760 system_timer = mdesc->timer;
761 init_machine = mdesc->init_machine;
764 #if defined(CONFIG_VGA_CONSOLE)
765 conswitchp = &vga_con;
766 #elif defined(CONFIG_DUMMY_CONSOLE)
767 conswitchp = &dummy_con;
774 static int __init topology_init(void)
778 for_each_possible_cpu(cpu) {
779 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
780 cpuinfo->cpu.hotpluggable = 1;
781 register_cpu(&cpuinfo->cpu, cpu);
787 subsys_initcall(topology_init);
789 static const char *hwcap_str[] = {
808 static int c_show(struct seq_file *m, void *v)
812 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
813 cpu_name, read_cpuid_id() & 15, elf_platform);
815 #if defined(CONFIG_SMP)
816 for_each_online_cpu(i) {
818 * glibc reads /proc/cpuinfo to determine the number of
819 * online processors, looking for lines beginning with
820 * "processor". Give glibc what it expects.
822 seq_printf(m, "processor\t: %d\n", i);
823 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
824 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
825 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
827 #else /* CONFIG_SMP */
828 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
829 loops_per_jiffy / (500000/HZ),
830 (loops_per_jiffy / (5000/HZ)) % 100);
833 /* dump out the processor features */
834 seq_puts(m, "Features\t: ");
836 for (i = 0; hwcap_str[i]; i++)
837 if (elf_hwcap & (1 << i))
838 seq_printf(m, "%s ", hwcap_str[i]);
840 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
841 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
843 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
845 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
847 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
849 seq_printf(m, "CPU variant\t: 0x%02x\n",
850 (read_cpuid_id() >> 16) & 127);
853 seq_printf(m, "CPU variant\t: 0x%x\n",
854 (read_cpuid_id() >> 20) & 15);
856 seq_printf(m, "CPU part\t: 0x%03x\n",
857 (read_cpuid_id() >> 4) & 0xfff);
859 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
863 seq_printf(m, "Hardware\t: %s\n", machine_name);
864 seq_printf(m, "Revision\t: %04x\n", system_rev);
865 seq_printf(m, "Serial\t\t: %08x%08x\n",
866 system_serial_high, system_serial_low);
871 static void *c_start(struct seq_file *m, loff_t *pos)
873 return *pos < 1 ? (void *)1 : NULL;
876 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
882 static void c_stop(struct seq_file *m, void *v)
886 const struct seq_operations cpuinfo_op = {