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>
27 #include <linux/proc_fs.h>
29 #include <asm/unified.h>
31 #include <asm/cputype.h>
33 #include <asm/procinfo.h>
34 #include <asm/sections.h>
35 #include <asm/setup.h>
36 #include <asm/mach-types.h>
37 #include <asm/cacheflush.h>
38 #include <asm/cachetype.h>
39 #include <asm/tlbflush.h>
41 #include <asm/mach/arch.h>
42 #include <asm/mach/irq.h>
43 #include <asm/mach/time.h>
44 #include <asm/traps.h>
45 #include <asm/unwind.h>
52 #define MEM_SIZE (16*1024*1024)
55 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
58 static int __init fpe_setup(char *line)
60 memcpy(fpe_type, line, 8);
64 __setup("fpe=", fpe_setup);
67 extern void paging_init(struct machine_desc *desc);
68 extern void reboot_setup(char *str);
70 unsigned int processor_id;
71 EXPORT_SYMBOL(processor_id);
72 unsigned int __machine_arch_type;
73 EXPORT_SYMBOL(__machine_arch_type);
75 EXPORT_SYMBOL(cacheid);
77 unsigned int __atags_pointer __initdata;
79 unsigned int system_rev;
80 EXPORT_SYMBOL(system_rev);
82 unsigned int system_serial_low;
83 EXPORT_SYMBOL(system_serial_low);
85 unsigned int system_serial_high;
86 EXPORT_SYMBOL(system_serial_high);
88 unsigned int elf_hwcap;
89 EXPORT_SYMBOL(elf_hwcap);
93 struct processor processor;
96 struct cpu_tlb_fns cpu_tlb;
99 struct cpu_user_fns cpu_user;
102 struct cpu_cache_fns cpu_cache;
104 #ifdef CONFIG_OUTER_CACHE
105 struct outer_cache_fns outer_cache;
106 EXPORT_SYMBOL(outer_cache);
113 } ____cacheline_aligned;
115 static struct stack stacks[NR_CPUS];
117 char elf_platform[ELF_PLATFORM_SIZE];
118 EXPORT_SYMBOL(elf_platform);
120 static const char *cpu_name;
121 static const char *machine_name;
122 static char __initdata cmd_line[COMMAND_LINE_SIZE];
124 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
125 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
126 #define ENDIANNESS ((char)endian_test.l)
128 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
131 * Standard memory resources
133 static struct resource mem_res[] = {
138 .flags = IORESOURCE_MEM
141 .name = "Kernel text",
144 .flags = IORESOURCE_MEM
147 .name = "Kernel data",
150 .flags = IORESOURCE_MEM
154 #define video_ram mem_res[0]
155 #define kernel_code mem_res[1]
156 #define kernel_data mem_res[2]
158 static struct resource io_res[] = {
163 .flags = IORESOURCE_IO | IORESOURCE_BUSY
169 .flags = IORESOURCE_IO | IORESOURCE_BUSY
175 .flags = IORESOURCE_IO | IORESOURCE_BUSY
179 #define lp0 io_res[0]
180 #define lp1 io_res[1]
181 #define lp2 io_res[2]
183 static const char *proc_arch[] = {
203 int cpu_architecture(void)
207 if ((read_cpuid_id() & 0x0008f000) == 0) {
208 cpu_arch = CPU_ARCH_UNKNOWN;
209 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
210 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
211 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
212 cpu_arch = (read_cpuid_id() >> 16) & 7;
214 cpu_arch += CPU_ARCH_ARMv3;
215 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
218 /* Revised CPUID format. Read the Memory Model Feature
219 * Register 0 and check for VMSAv7 or PMSAv7 */
220 asm("mrc p15, 0, %0, c0, c1, 4"
222 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
223 (mmfr0 & 0x000000f0) == 0x00000030)
224 cpu_arch = CPU_ARCH_ARMv7;
225 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
226 (mmfr0 & 0x000000f0) == 0x00000020)
227 cpu_arch = CPU_ARCH_ARMv6;
229 cpu_arch = CPU_ARCH_UNKNOWN;
231 cpu_arch = CPU_ARCH_UNKNOWN;
236 static void __init cacheid_init(void)
238 unsigned int cachetype = read_cpuid_cachetype();
239 unsigned int arch = cpu_architecture();
241 if (arch >= CPU_ARCH_ARMv6) {
242 if ((cachetype & (7 << 29)) == 4 << 29) {
243 /* ARMv7 register format */
244 cacheid = CACHEID_VIPT_NONALIASING;
245 if ((cachetype & (3 << 14)) == 1 << 14)
246 cacheid |= CACHEID_ASID_TAGGED;
247 } else if (cachetype & (1 << 23))
248 cacheid = CACHEID_VIPT_ALIASING;
250 cacheid = CACHEID_VIPT_NONALIASING;
252 cacheid = CACHEID_VIVT;
255 printk("CPU: %s data cache, %s instruction cache\n",
256 cache_is_vivt() ? "VIVT" :
257 cache_is_vipt_aliasing() ? "VIPT aliasing" :
258 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
259 cache_is_vivt() ? "VIVT" :
260 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
261 cache_is_vipt_aliasing() ? "VIPT aliasing" :
262 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
266 * These functions re-use the assembly code in head.S, which
267 * already provide the required functionality.
269 extern struct proc_info_list *lookup_processor_type(unsigned int);
270 extern struct machine_desc *lookup_machine_type(unsigned int);
272 static void __init setup_processor(void)
274 struct proc_info_list *list;
277 * locate processor in the list of supported processor
278 * types. The linker builds this table for us from the
279 * entries in arch/arm/mm/proc-*.S
281 list = lookup_processor_type(read_cpuid_id());
283 printk("CPU configuration botched (ID %08x), unable "
284 "to continue.\n", read_cpuid_id());
288 cpu_name = list->cpu_name;
291 processor = *list->proc;
294 cpu_tlb = *list->tlb;
297 cpu_user = *list->user;
300 cpu_cache = *list->cache;
303 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
304 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
305 proc_arch[cpu_architecture()], cr_alignment);
307 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
308 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
309 elf_hwcap = list->elf_hwcap;
310 #ifndef CONFIG_ARM_THUMB
311 elf_hwcap &= ~HWCAP_THUMB;
319 * cpu_init - initialise one CPU.
321 * cpu_init sets up the per-CPU stacks.
325 unsigned int cpu = smp_processor_id();
326 struct stack *stk = &stacks[cpu];
328 if (cpu >= NR_CPUS) {
329 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
334 * Define the placement constraint for the inline asm directive below.
335 * In Thumb-2, msr with an immediate value is not allowed.
337 #ifdef CONFIG_THUMB2_KERNEL
344 * setup stacks for re-entrant exception handlers
348 "add r14, %0, %2\n\t"
351 "add r14, %0, %4\n\t"
354 "add r14, %0, %6\n\t"
359 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
360 "I" (offsetof(struct stack, irq[0])),
361 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
362 "I" (offsetof(struct stack, abt[0])),
363 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
364 "I" (offsetof(struct stack, und[0])),
365 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
369 static struct machine_desc * __init setup_machine(unsigned int nr)
371 struct machine_desc *list;
374 * locate machine in the list of supported machines.
376 list = lookup_machine_type(nr);
378 printk("Machine configuration botched (nr %d), unable "
379 "to continue.\n", nr);
383 printk("Machine: %s\n", list->name);
388 static int __init arm_add_memory(unsigned long start, unsigned long size)
390 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
392 if (meminfo.nr_banks >= NR_BANKS) {
393 printk(KERN_CRIT "NR_BANKS too low, "
394 "ignoring memory at %#lx\n", start);
399 * Ensure that start/size are aligned to a page boundary.
400 * Size is appropriately rounded down, start is rounded up.
402 size -= start & ~PAGE_MASK;
403 bank->start = PAGE_ALIGN(start);
404 bank->size = size & PAGE_MASK;
405 bank->node = PHYS_TO_NID(start);
408 * Check whether this memory region has non-zero size or
409 * invalid node number.
411 if (bank->size == 0 || bank->node >= MAX_NUMNODES)
419 * Pick out the memory size. We look for mem=size@start,
420 * where start and size are "size[KkMm]"
422 static int __init early_mem(char *p)
424 static int usermem __initdata = 0;
425 unsigned long size, start;
429 * If the user specifies memory size, we
430 * blow away any automatically generated
435 meminfo.nr_banks = 0;
439 size = memparse(p, &endp);
441 start = memparse(endp + 1, NULL);
443 arm_add_memory(start, size);
447 early_param("mem", early_mem);
450 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
452 #ifdef CONFIG_BLK_DEV_RAM
453 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
455 rd_image_start = image_start;
465 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
467 struct resource *res;
470 kernel_code.start = virt_to_phys(_text);
471 kernel_code.end = virt_to_phys(_etext - 1);
472 kernel_data.start = virt_to_phys(_data);
473 kernel_data.end = virt_to_phys(_end - 1);
475 for (i = 0; i < mi->nr_banks; i++) {
476 if (mi->bank[i].size == 0)
479 res = alloc_bootmem_low(sizeof(*res));
480 res->name = "System RAM";
481 res->start = mi->bank[i].start;
482 res->end = mi->bank[i].start + mi->bank[i].size - 1;
483 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
485 request_resource(&iomem_resource, res);
487 if (kernel_code.start >= res->start &&
488 kernel_code.end <= res->end)
489 request_resource(res, &kernel_code);
490 if (kernel_data.start >= res->start &&
491 kernel_data.end <= res->end)
492 request_resource(res, &kernel_data);
495 if (mdesc->video_start) {
496 video_ram.start = mdesc->video_start;
497 video_ram.end = mdesc->video_end;
498 request_resource(&iomem_resource, &video_ram);
502 * Some machines don't have the possibility of ever
503 * possessing lp0, lp1 or lp2
505 if (mdesc->reserve_lp0)
506 request_resource(&ioport_resource, &lp0);
507 if (mdesc->reserve_lp1)
508 request_resource(&ioport_resource, &lp1);
509 if (mdesc->reserve_lp2)
510 request_resource(&ioport_resource, &lp2);
516 * This is the new way of passing data to the kernel at boot time. Rather
517 * than passing a fixed inflexible structure to the kernel, we pass a list
518 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
519 * tag for the list to be recognised (to distinguish the tagged list from
520 * a param_struct). The list is terminated with a zero-length tag (this tag
521 * is not parsed in any way).
523 static int __init parse_tag_core(const struct tag *tag)
525 if (tag->hdr.size > 2) {
526 if ((tag->u.core.flags & 1) == 0)
527 root_mountflags &= ~MS_RDONLY;
528 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
533 __tagtable(ATAG_CORE, parse_tag_core);
535 static int __init parse_tag_mem32(const struct tag *tag)
537 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
540 __tagtable(ATAG_MEM, parse_tag_mem32);
542 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
543 struct screen_info screen_info = {
544 .orig_video_lines = 30,
545 .orig_video_cols = 80,
546 .orig_video_mode = 0,
547 .orig_video_ega_bx = 0,
548 .orig_video_isVGA = 1,
549 .orig_video_points = 8
552 static int __init parse_tag_videotext(const struct tag *tag)
554 screen_info.orig_x = tag->u.videotext.x;
555 screen_info.orig_y = tag->u.videotext.y;
556 screen_info.orig_video_page = tag->u.videotext.video_page;
557 screen_info.orig_video_mode = tag->u.videotext.video_mode;
558 screen_info.orig_video_cols = tag->u.videotext.video_cols;
559 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
560 screen_info.orig_video_lines = tag->u.videotext.video_lines;
561 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
562 screen_info.orig_video_points = tag->u.videotext.video_points;
566 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
569 static int __init parse_tag_ramdisk(const struct tag *tag)
571 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
572 (tag->u.ramdisk.flags & 2) == 0,
573 tag->u.ramdisk.start, tag->u.ramdisk.size);
577 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
579 static int __init parse_tag_serialnr(const struct tag *tag)
581 system_serial_low = tag->u.serialnr.low;
582 system_serial_high = tag->u.serialnr.high;
586 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
588 static int __init parse_tag_revision(const struct tag *tag)
590 system_rev = tag->u.revision.rev;
594 __tagtable(ATAG_REVISION, parse_tag_revision);
596 static int __init parse_tag_cmdline(const struct tag *tag)
598 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
602 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
605 * Scan the tag table for this tag, and call its parse function.
606 * The tag table is built by the linker from all the __tagtable
609 static int __init parse_tag(const struct tag *tag)
611 extern struct tagtable __tagtable_begin, __tagtable_end;
614 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
615 if (tag->hdr.tag == t->tag) {
620 return t < &__tagtable_end;
624 * Parse all tags in the list, checking both the global and architecture
625 * specific tag tables.
627 static void __init parse_tags(const struct tag *t)
629 for (; t->hdr.size; t = tag_next(t))
632 "Ignoring unrecognised tag 0x%08x\n",
637 * This holds our defaults.
639 static struct init_tags {
640 struct tag_header hdr1;
641 struct tag_core core;
642 struct tag_header hdr2;
643 struct tag_mem32 mem;
644 struct tag_header hdr3;
645 } init_tags __initdata = {
646 { tag_size(tag_core), ATAG_CORE },
647 { 1, PAGE_SIZE, 0xff },
648 { tag_size(tag_mem32), ATAG_MEM },
649 { MEM_SIZE, PHYS_OFFSET },
653 static void (*init_machine)(void) __initdata;
655 static int __init customize_machine(void)
657 /* customizes platform devices, or adds new ones */
662 arch_initcall(customize_machine);
664 void __init setup_arch(char **cmdline_p)
666 struct tag *tags = (struct tag *)&init_tags;
667 struct machine_desc *mdesc;
668 char *from = default_command_line;
673 mdesc = setup_machine(machine_arch_type);
674 machine_name = mdesc->name;
676 if (mdesc->soft_reboot)
680 tags = phys_to_virt(__atags_pointer);
681 else if (mdesc->boot_params)
682 tags = phys_to_virt(mdesc->boot_params);
685 * If we have the old style parameters, convert them to
688 if (tags->hdr.tag != ATAG_CORE)
689 convert_to_tag_list(tags);
690 if (tags->hdr.tag != ATAG_CORE)
691 tags = (struct tag *)&init_tags;
694 mdesc->fixup(mdesc, tags, &from, &meminfo);
696 if (tags->hdr.tag == ATAG_CORE) {
697 if (meminfo.nr_banks != 0)
698 squash_mem_tags(tags);
703 init_mm.start_code = (unsigned long) _text;
704 init_mm.end_code = (unsigned long) _etext;
705 init_mm.end_data = (unsigned long) _edata;
706 init_mm.brk = (unsigned long) _end;
708 /* parse_early_param needs a boot_command_line */
709 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
711 /* populate cmd_line too for later use, preserving boot_command_line */
712 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
713 *cmdline_p = cmd_line;
718 request_standard_resources(&meminfo, mdesc);
728 * Set up various architecture-specific pointers
730 init_arch_irq = mdesc->init_irq;
731 system_timer = mdesc->timer;
732 init_machine = mdesc->init_machine;
735 #if defined(CONFIG_VGA_CONSOLE)
736 conswitchp = &vga_con;
737 #elif defined(CONFIG_DUMMY_CONSOLE)
738 conswitchp = &dummy_con;
745 static int __init topology_init(void)
749 for_each_possible_cpu(cpu) {
750 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
751 cpuinfo->cpu.hotpluggable = 1;
752 register_cpu(&cpuinfo->cpu, cpu);
757 subsys_initcall(topology_init);
759 #ifdef CONFIG_HAVE_PROC_CPU
760 static int __init proc_cpu_init(void)
762 struct proc_dir_entry *res;
764 res = proc_mkdir("cpu", NULL);
769 fs_initcall(proc_cpu_init);
772 static const char *hwcap_str[] = {
791 static int c_show(struct seq_file *m, void *v)
795 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
796 cpu_name, read_cpuid_id() & 15, elf_platform);
798 #if defined(CONFIG_SMP)
799 for_each_online_cpu(i) {
801 * glibc reads /proc/cpuinfo to determine the number of
802 * online processors, looking for lines beginning with
803 * "processor". Give glibc what it expects.
805 seq_printf(m, "processor\t: %d\n", i);
806 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
807 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
808 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
810 #else /* CONFIG_SMP */
811 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
812 loops_per_jiffy / (500000/HZ),
813 (loops_per_jiffy / (5000/HZ)) % 100);
816 /* dump out the processor features */
817 seq_puts(m, "Features\t: ");
819 for (i = 0; hwcap_str[i]; i++)
820 if (elf_hwcap & (1 << i))
821 seq_printf(m, "%s ", hwcap_str[i]);
823 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
824 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
826 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
828 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
830 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
832 seq_printf(m, "CPU variant\t: 0x%02x\n",
833 (read_cpuid_id() >> 16) & 127);
836 seq_printf(m, "CPU variant\t: 0x%x\n",
837 (read_cpuid_id() >> 20) & 15);
839 seq_printf(m, "CPU part\t: 0x%03x\n",
840 (read_cpuid_id() >> 4) & 0xfff);
842 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
846 seq_printf(m, "Hardware\t: %s\n", machine_name);
847 seq_printf(m, "Revision\t: %04x\n", system_rev);
848 seq_printf(m, "Serial\t\t: %08x%08x\n",
849 system_serial_high, system_serial_low);
854 static void *c_start(struct seq_file *m, loff_t *pos)
856 return *pos < 1 ? (void *)1 : NULL;
859 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
865 static void c_stop(struct seq_file *m, void *v)
869 const struct seq_operations cpuinfo_op = {