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>
50 #define MEM_SIZE (16*1024*1024)
53 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
56 static int __init fpe_setup(char *line)
58 memcpy(fpe_type, line, 8);
62 __setup("fpe=", fpe_setup);
65 extern void paging_init(struct machine_desc *desc);
66 extern void reboot_setup(char *str);
68 unsigned int processor_id;
69 EXPORT_SYMBOL(processor_id);
70 unsigned int __machine_arch_type;
71 EXPORT_SYMBOL(__machine_arch_type);
73 EXPORT_SYMBOL(cacheid);
75 unsigned int __atags_pointer __initdata;
77 unsigned int system_rev;
78 EXPORT_SYMBOL(system_rev);
80 unsigned int system_serial_low;
81 EXPORT_SYMBOL(system_serial_low);
83 unsigned int system_serial_high;
84 EXPORT_SYMBOL(system_serial_high);
86 unsigned int elf_hwcap;
87 EXPORT_SYMBOL(elf_hwcap);
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 const char *cpu_name;
118 static const char *machine_name;
119 static char __initdata command_line[COMMAND_LINE_SIZE];
121 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
122 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
123 #define ENDIANNESS ((char)endian_test.l)
125 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
128 * Standard memory resources
130 static struct resource mem_res[] = {
135 .flags = IORESOURCE_MEM
138 .name = "Kernel text",
141 .flags = IORESOURCE_MEM
144 .name = "Kernel data",
147 .flags = IORESOURCE_MEM
151 #define video_ram mem_res[0]
152 #define kernel_code mem_res[1]
153 #define kernel_data mem_res[2]
155 static struct resource io_res[] = {
160 .flags = IORESOURCE_IO | IORESOURCE_BUSY
166 .flags = IORESOURCE_IO | IORESOURCE_BUSY
172 .flags = IORESOURCE_IO | IORESOURCE_BUSY
176 #define lp0 io_res[0]
177 #define lp1 io_res[1]
178 #define lp2 io_res[2]
180 static const char *proc_arch[] = {
200 int cpu_architecture(void)
204 if ((read_cpuid_id() & 0x0008f000) == 0) {
205 cpu_arch = CPU_ARCH_UNKNOWN;
206 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
207 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
208 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
209 cpu_arch = (read_cpuid_id() >> 16) & 7;
211 cpu_arch += CPU_ARCH_ARMv3;
212 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
215 /* Revised CPUID format. Read the Memory Model Feature
216 * Register 0 and check for VMSAv7 or PMSAv7 */
217 asm("mrc p15, 0, %0, c0, c1, 4"
219 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
220 (mmfr0 & 0x000000f0) == 0x00000030)
221 cpu_arch = CPU_ARCH_ARMv7;
222 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
223 (mmfr0 & 0x000000f0) == 0x00000020)
224 cpu_arch = CPU_ARCH_ARMv6;
226 cpu_arch = CPU_ARCH_UNKNOWN;
228 cpu_arch = CPU_ARCH_UNKNOWN;
233 static void __init cacheid_init(void)
235 unsigned int cachetype = read_cpuid_cachetype();
236 unsigned int arch = cpu_architecture();
238 if (arch >= CPU_ARCH_ARMv6) {
239 if ((cachetype & (7 << 29)) == 4 << 29) {
240 /* ARMv7 register format */
241 cacheid = CACHEID_VIPT_NONALIASING;
242 if ((cachetype & (3 << 14)) == 1 << 14)
243 cacheid |= CACHEID_ASID_TAGGED;
244 } else 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 * Define the placement constraint for the inline asm directive below.
332 * In Thumb-2, msr with an immediate value is not allowed.
334 #ifdef CONFIG_THUMB2_KERNEL
341 * setup stacks for re-entrant exception handlers
345 "add r14, %0, %2\n\t"
348 "add r14, %0, %4\n\t"
351 "add r14, %0, %6\n\t"
356 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
357 "I" (offsetof(struct stack, irq[0])),
358 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
359 "I" (offsetof(struct stack, abt[0])),
360 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
361 "I" (offsetof(struct stack, und[0])),
362 PLC (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 int __init arm_add_memory(unsigned long start, unsigned long size)
387 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
389 if (meminfo.nr_banks >= NR_BANKS) {
390 printk(KERN_CRIT "NR_BANKS too low, "
391 "ignoring memory at %#lx\n", start);
396 * Ensure that start/size are aligned to a page boundary.
397 * Size is appropriately rounded down, start is rounded up.
399 size -= start & ~PAGE_MASK;
400 bank->start = PAGE_ALIGN(start);
401 bank->size = size & PAGE_MASK;
402 bank->node = PHYS_TO_NID(start);
405 * Check whether this memory region has non-zero size or
406 * invalid node number.
408 if (bank->size == 0 || bank->node >= MAX_NUMNODES)
416 * Pick out the memory size. We look for mem=size@start,
417 * where start and size are "size[KkMm]"
419 static void __init early_mem(char **p)
421 static int usermem __initdata = 0;
422 unsigned long size, start;
425 * If the user specifies memory size, we
426 * blow away any automatically generated
431 meminfo.nr_banks = 0;
435 size = memparse(*p, p);
437 start = memparse(*p + 1, p);
439 arm_add_memory(start, size);
441 __early_param("mem=", early_mem);
444 * Initial parsing of the command line.
446 static void __init parse_cmdline(char **cmdline_p, char *from)
448 char c = ' ', *to = command_line;
453 extern struct early_params __early_begin, __early_end;
454 struct early_params *p;
456 for (p = &__early_begin; p < &__early_end; p++) {
457 int arglen = strlen(p->arg);
459 if (memcmp(from, p->arg, arglen) == 0) {
460 if (to != command_line)
465 while (*from != ' ' && *from != '\0')
474 if (COMMAND_LINE_SIZE <= ++len)
479 *cmdline_p = command_line;
483 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
485 #ifdef CONFIG_BLK_DEV_RAM
486 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
488 rd_image_start = image_start;
498 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
500 struct resource *res;
503 kernel_code.start = virt_to_phys(_text);
504 kernel_code.end = virt_to_phys(_etext - 1);
505 kernel_data.start = virt_to_phys(_data);
506 kernel_data.end = virt_to_phys(_end - 1);
508 for (i = 0; i < mi->nr_banks; i++) {
509 if (mi->bank[i].size == 0)
512 res = alloc_bootmem_low(sizeof(*res));
513 res->name = "System RAM";
514 res->start = mi->bank[i].start;
515 res->end = mi->bank[i].start + mi->bank[i].size - 1;
516 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
518 request_resource(&iomem_resource, res);
520 if (kernel_code.start >= res->start &&
521 kernel_code.end <= res->end)
522 request_resource(res, &kernel_code);
523 if (kernel_data.start >= res->start &&
524 kernel_data.end <= res->end)
525 request_resource(res, &kernel_data);
528 if (mdesc->video_start) {
529 video_ram.start = mdesc->video_start;
530 video_ram.end = mdesc->video_end;
531 request_resource(&iomem_resource, &video_ram);
535 * Some machines don't have the possibility of ever
536 * possessing lp0, lp1 or lp2
538 if (mdesc->reserve_lp0)
539 request_resource(&ioport_resource, &lp0);
540 if (mdesc->reserve_lp1)
541 request_resource(&ioport_resource, &lp1);
542 if (mdesc->reserve_lp2)
543 request_resource(&ioport_resource, &lp2);
549 * This is the new way of passing data to the kernel at boot time. Rather
550 * than passing a fixed inflexible structure to the kernel, we pass a list
551 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
552 * tag for the list to be recognised (to distinguish the tagged list from
553 * a param_struct). The list is terminated with a zero-length tag (this tag
554 * is not parsed in any way).
556 static int __init parse_tag_core(const struct tag *tag)
558 if (tag->hdr.size > 2) {
559 if ((tag->u.core.flags & 1) == 0)
560 root_mountflags &= ~MS_RDONLY;
561 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
566 __tagtable(ATAG_CORE, parse_tag_core);
568 static int __init parse_tag_mem32(const struct tag *tag)
570 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
573 __tagtable(ATAG_MEM, parse_tag_mem32);
575 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
576 struct screen_info screen_info = {
577 .orig_video_lines = 30,
578 .orig_video_cols = 80,
579 .orig_video_mode = 0,
580 .orig_video_ega_bx = 0,
581 .orig_video_isVGA = 1,
582 .orig_video_points = 8
585 static int __init parse_tag_videotext(const struct tag *tag)
587 screen_info.orig_x = tag->u.videotext.x;
588 screen_info.orig_y = tag->u.videotext.y;
589 screen_info.orig_video_page = tag->u.videotext.video_page;
590 screen_info.orig_video_mode = tag->u.videotext.video_mode;
591 screen_info.orig_video_cols = tag->u.videotext.video_cols;
592 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
593 screen_info.orig_video_lines = tag->u.videotext.video_lines;
594 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
595 screen_info.orig_video_points = tag->u.videotext.video_points;
599 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
602 static int __init parse_tag_ramdisk(const struct tag *tag)
604 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
605 (tag->u.ramdisk.flags & 2) == 0,
606 tag->u.ramdisk.start, tag->u.ramdisk.size);
610 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
612 static int __init parse_tag_serialnr(const struct tag *tag)
614 system_serial_low = tag->u.serialnr.low;
615 system_serial_high = tag->u.serialnr.high;
619 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
621 static int __init parse_tag_revision(const struct tag *tag)
623 system_rev = tag->u.revision.rev;
627 __tagtable(ATAG_REVISION, parse_tag_revision);
629 static int __init parse_tag_cmdline(const struct tag *tag)
631 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
635 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
638 * Scan the tag table for this tag, and call its parse function.
639 * The tag table is built by the linker from all the __tagtable
642 static int __init parse_tag(const struct tag *tag)
644 extern struct tagtable __tagtable_begin, __tagtable_end;
647 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
648 if (tag->hdr.tag == t->tag) {
653 return t < &__tagtable_end;
657 * Parse all tags in the list, checking both the global and architecture
658 * specific tag tables.
660 static void __init parse_tags(const struct tag *t)
662 for (; t->hdr.size; t = tag_next(t))
665 "Ignoring unrecognised tag 0x%08x\n",
670 * This holds our defaults.
672 static struct init_tags {
673 struct tag_header hdr1;
674 struct tag_core core;
675 struct tag_header hdr2;
676 struct tag_mem32 mem;
677 struct tag_header hdr3;
678 } init_tags __initdata = {
679 { tag_size(tag_core), ATAG_CORE },
680 { 1, PAGE_SIZE, 0xff },
681 { tag_size(tag_mem32), ATAG_MEM },
682 { MEM_SIZE, PHYS_OFFSET },
686 static void (*init_machine)(void) __initdata;
688 static int __init customize_machine(void)
690 /* customizes platform devices, or adds new ones */
695 arch_initcall(customize_machine);
697 void __init setup_arch(char **cmdline_p)
699 struct tag *tags = (struct tag *)&init_tags;
700 struct machine_desc *mdesc;
701 char *from = default_command_line;
706 mdesc = setup_machine(machine_arch_type);
707 machine_name = mdesc->name;
709 if (mdesc->soft_reboot)
713 tags = phys_to_virt(__atags_pointer);
714 else if (mdesc->boot_params)
715 tags = phys_to_virt(mdesc->boot_params);
718 * If we have the old style parameters, convert them to
721 if (tags->hdr.tag != ATAG_CORE)
722 convert_to_tag_list(tags);
723 if (tags->hdr.tag != ATAG_CORE)
724 tags = (struct tag *)&init_tags;
727 mdesc->fixup(mdesc, tags, &from, &meminfo);
729 if (tags->hdr.tag == ATAG_CORE) {
730 if (meminfo.nr_banks != 0)
731 squash_mem_tags(tags);
736 init_mm.start_code = (unsigned long) _text;
737 init_mm.end_code = (unsigned long) _etext;
738 init_mm.end_data = (unsigned long) _edata;
739 init_mm.brk = (unsigned long) _end;
741 memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
742 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
743 parse_cmdline(cmdline_p, from);
745 request_standard_resources(&meminfo, mdesc);
754 * Set up various architecture-specific pointers
756 init_arch_irq = mdesc->init_irq;
757 system_timer = mdesc->timer;
758 init_machine = mdesc->init_machine;
761 #if defined(CONFIG_VGA_CONSOLE)
762 conswitchp = &vga_con;
763 #elif defined(CONFIG_DUMMY_CONSOLE)
764 conswitchp = &dummy_con;
771 static int __init topology_init(void)
775 for_each_possible_cpu(cpu) {
776 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
777 cpuinfo->cpu.hotpluggable = 1;
778 register_cpu(&cpuinfo->cpu, cpu);
784 subsys_initcall(topology_init);
786 static const char *hwcap_str[] = {
805 static int c_show(struct seq_file *m, void *v)
809 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
810 cpu_name, read_cpuid_id() & 15, elf_platform);
812 #if defined(CONFIG_SMP)
813 for_each_online_cpu(i) {
815 * glibc reads /proc/cpuinfo to determine the number of
816 * online processors, looking for lines beginning with
817 * "processor". Give glibc what it expects.
819 seq_printf(m, "processor\t: %d\n", i);
820 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
821 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
822 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
824 #else /* CONFIG_SMP */
825 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
826 loops_per_jiffy / (500000/HZ),
827 (loops_per_jiffy / (5000/HZ)) % 100);
830 /* dump out the processor features */
831 seq_puts(m, "Features\t: ");
833 for (i = 0; hwcap_str[i]; i++)
834 if (elf_hwcap & (1 << i))
835 seq_printf(m, "%s ", hwcap_str[i]);
837 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
838 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
840 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
842 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
844 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
846 seq_printf(m, "CPU variant\t: 0x%02x\n",
847 (read_cpuid_id() >> 16) & 127);
850 seq_printf(m, "CPU variant\t: 0x%x\n",
851 (read_cpuid_id() >> 20) & 15);
853 seq_printf(m, "CPU part\t: 0x%03x\n",
854 (read_cpuid_id() >> 4) & 0xfff);
856 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
860 seq_printf(m, "Hardware\t: %s\n", machine_name);
861 seq_printf(m, "Revision\t: %04x\n", system_rev);
862 seq_printf(m, "Serial\t\t: %08x%08x\n",
863 system_serial_high, system_serial_low);
868 static void *c_start(struct seq_file *m, loff_t *pos)
870 return *pos < 1 ? (void *)1 : NULL;
873 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
879 static void c_stop(struct seq_file *m, void *v)
883 const struct seq_operations cpuinfo_op = {