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;
111 } ____cacheline_aligned;
113 static struct stack stacks[NR_CPUS];
115 char elf_platform[ELF_PLATFORM_SIZE];
116 EXPORT_SYMBOL(elf_platform);
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_ARMv6) {
240 if ((cachetype & (7 << 29)) == 4 << 29) {
241 /* ARMv7 register format */
242 cacheid = CACHEID_VIPT_NONALIASING;
243 if ((cachetype & (3 << 14)) == 1 << 14)
244 cacheid |= CACHEID_ASID_TAGGED;
245 } else if (cachetype & (1 << 23))
246 cacheid = CACHEID_VIPT_ALIASING;
248 cacheid = CACHEID_VIPT_NONALIASING;
250 cacheid = CACHEID_VIVT;
253 printk("CPU: %s data cache, %s instruction cache\n",
254 cache_is_vivt() ? "VIVT" :
255 cache_is_vipt_aliasing() ? "VIPT aliasing" :
256 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
257 cache_is_vivt() ? "VIVT" :
258 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
259 cache_is_vipt_aliasing() ? "VIPT aliasing" :
260 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
264 * These functions re-use the assembly code in head.S, which
265 * already provide the required functionality.
267 extern struct proc_info_list *lookup_processor_type(unsigned int);
268 extern struct machine_desc *lookup_machine_type(unsigned int);
270 static void __init setup_processor(void)
272 struct proc_info_list *list;
275 * locate processor in the list of supported processor
276 * types. The linker builds this table for us from the
277 * entries in arch/arm/mm/proc-*.S
279 list = lookup_processor_type(read_cpuid_id());
281 printk("CPU configuration botched (ID %08x), unable "
282 "to continue.\n", read_cpuid_id());
286 cpu_name = list->cpu_name;
289 processor = *list->proc;
292 cpu_tlb = *list->tlb;
295 cpu_user = *list->user;
298 cpu_cache = *list->cache;
301 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
302 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
303 proc_arch[cpu_architecture()], cr_alignment);
305 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
306 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
307 elf_hwcap = list->elf_hwcap;
308 #ifndef CONFIG_ARM_THUMB
309 elf_hwcap &= ~HWCAP_THUMB;
317 * cpu_init - initialise one CPU.
319 * cpu_init sets up the per-CPU stacks.
323 unsigned int cpu = smp_processor_id();
324 struct stack *stk = &stacks[cpu];
326 if (cpu >= NR_CPUS) {
327 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
332 * Define the placement constraint for the inline asm directive below.
333 * In Thumb-2, msr with an immediate value is not allowed.
335 #ifdef CONFIG_THUMB2_KERNEL
342 * setup stacks for re-entrant exception handlers
346 "add r14, %0, %2\n\t"
349 "add r14, %0, %4\n\t"
352 "add r14, %0, %6\n\t"
357 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
358 "I" (offsetof(struct stack, irq[0])),
359 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
360 "I" (offsetof(struct stack, abt[0])),
361 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
362 "I" (offsetof(struct stack, und[0])),
363 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
367 static struct machine_desc * __init setup_machine(unsigned int nr)
369 struct machine_desc *list;
372 * locate machine in the list of supported machines.
374 list = lookup_machine_type(nr);
376 printk("Machine configuration botched (nr %d), unable "
377 "to continue.\n", nr);
381 printk("Machine: %s\n", list->name);
386 static int __init arm_add_memory(unsigned long start, unsigned long size)
388 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
390 if (meminfo.nr_banks >= NR_BANKS) {
391 printk(KERN_CRIT "NR_BANKS too low, "
392 "ignoring memory at %#lx\n", start);
397 * Ensure that start/size are aligned to a page boundary.
398 * Size is appropriately rounded down, start is rounded up.
400 size -= start & ~PAGE_MASK;
401 bank->start = PAGE_ALIGN(start);
402 bank->size = size & PAGE_MASK;
403 bank->node = PHYS_TO_NID(start);
406 * Check whether this memory region has non-zero size or
407 * invalid node number.
409 if (bank->size == 0 || bank->node >= MAX_NUMNODES)
417 * Pick out the memory size. We look for mem=size@start,
418 * where start and size are "size[KkMm]"
420 static void __init early_mem(char **p)
422 static int usermem __initdata = 0;
423 unsigned long size, start;
426 * If the user specifies memory size, we
427 * blow away any automatically generated
432 meminfo.nr_banks = 0;
436 size = memparse(*p, p);
438 start = memparse(*p + 1, p);
440 arm_add_memory(start, size);
442 __early_param("mem=", early_mem);
445 * Initial parsing of the command line.
447 static void __init parse_cmdline(char **cmdline_p, char *from)
449 char c = ' ', *to = command_line;
454 extern struct early_params __early_begin, __early_end;
455 struct early_params *p;
457 for (p = &__early_begin; p < &__early_end; p++) {
458 int arglen = strlen(p->arg);
460 if (memcmp(from, p->arg, arglen) == 0) {
461 if (to != command_line)
466 while (*from != ' ' && *from != '\0')
475 if (COMMAND_LINE_SIZE <= ++len)
480 *cmdline_p = command_line;
484 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
486 #ifdef CONFIG_BLK_DEV_RAM
487 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
489 rd_image_start = image_start;
499 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
501 struct resource *res;
504 kernel_code.start = virt_to_phys(_text);
505 kernel_code.end = virt_to_phys(_etext - 1);
506 kernel_data.start = virt_to_phys(_data);
507 kernel_data.end = virt_to_phys(_end - 1);
509 for (i = 0; i < mi->nr_banks; i++) {
510 if (mi->bank[i].size == 0)
513 res = alloc_bootmem_low(sizeof(*res));
514 res->name = "System RAM";
515 res->start = mi->bank[i].start;
516 res->end = mi->bank[i].start + mi->bank[i].size - 1;
517 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
519 request_resource(&iomem_resource, res);
521 if (kernel_code.start >= res->start &&
522 kernel_code.end <= res->end)
523 request_resource(res, &kernel_code);
524 if (kernel_data.start >= res->start &&
525 kernel_data.end <= res->end)
526 request_resource(res, &kernel_data);
529 if (mdesc->video_start) {
530 video_ram.start = mdesc->video_start;
531 video_ram.end = mdesc->video_end;
532 request_resource(&iomem_resource, &video_ram);
536 * Some machines don't have the possibility of ever
537 * possessing lp0, lp1 or lp2
539 if (mdesc->reserve_lp0)
540 request_resource(&ioport_resource, &lp0);
541 if (mdesc->reserve_lp1)
542 request_resource(&ioport_resource, &lp1);
543 if (mdesc->reserve_lp2)
544 request_resource(&ioport_resource, &lp2);
550 * This is the new way of passing data to the kernel at boot time. Rather
551 * than passing a fixed inflexible structure to the kernel, we pass a list
552 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
553 * tag for the list to be recognised (to distinguish the tagged list from
554 * a param_struct). The list is terminated with a zero-length tag (this tag
555 * is not parsed in any way).
557 static int __init parse_tag_core(const struct tag *tag)
559 if (tag->hdr.size > 2) {
560 if ((tag->u.core.flags & 1) == 0)
561 root_mountflags &= ~MS_RDONLY;
562 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
567 __tagtable(ATAG_CORE, parse_tag_core);
569 static int __init parse_tag_mem32(const struct tag *tag)
571 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
574 __tagtable(ATAG_MEM, parse_tag_mem32);
576 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
577 struct screen_info screen_info = {
578 .orig_video_lines = 30,
579 .orig_video_cols = 80,
580 .orig_video_mode = 0,
581 .orig_video_ega_bx = 0,
582 .orig_video_isVGA = 1,
583 .orig_video_points = 8
586 static int __init parse_tag_videotext(const struct tag *tag)
588 screen_info.orig_x = tag->u.videotext.x;
589 screen_info.orig_y = tag->u.videotext.y;
590 screen_info.orig_video_page = tag->u.videotext.video_page;
591 screen_info.orig_video_mode = tag->u.videotext.video_mode;
592 screen_info.orig_video_cols = tag->u.videotext.video_cols;
593 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
594 screen_info.orig_video_lines = tag->u.videotext.video_lines;
595 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
596 screen_info.orig_video_points = tag->u.videotext.video_points;
600 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
603 static int __init parse_tag_ramdisk(const struct tag *tag)
605 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
606 (tag->u.ramdisk.flags & 2) == 0,
607 tag->u.ramdisk.start, tag->u.ramdisk.size);
611 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
613 static int __init parse_tag_serialnr(const struct tag *tag)
615 system_serial_low = tag->u.serialnr.low;
616 system_serial_high = tag->u.serialnr.high;
620 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
622 static int __init parse_tag_revision(const struct tag *tag)
624 system_rev = tag->u.revision.rev;
628 __tagtable(ATAG_REVISION, parse_tag_revision);
630 static int __init parse_tag_cmdline(const struct tag *tag)
632 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
636 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
639 * Scan the tag table for this tag, and call its parse function.
640 * The tag table is built by the linker from all the __tagtable
643 static int __init parse_tag(const struct tag *tag)
645 extern struct tagtable __tagtable_begin, __tagtable_end;
648 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
649 if (tag->hdr.tag == t->tag) {
654 return t < &__tagtable_end;
658 * Parse all tags in the list, checking both the global and architecture
659 * specific tag tables.
661 static void __init parse_tags(const struct tag *t)
663 for (; t->hdr.size; t = tag_next(t))
666 "Ignoring unrecognised tag 0x%08x\n",
671 * This holds our defaults.
673 static struct init_tags {
674 struct tag_header hdr1;
675 struct tag_core core;
676 struct tag_header hdr2;
677 struct tag_mem32 mem;
678 struct tag_header hdr3;
679 } init_tags __initdata = {
680 { tag_size(tag_core), ATAG_CORE },
681 { 1, PAGE_SIZE, 0xff },
682 { tag_size(tag_mem32), ATAG_MEM },
683 { MEM_SIZE, PHYS_OFFSET },
687 static void (*init_machine)(void) __initdata;
689 static int __init customize_machine(void)
691 /* customizes platform devices, or adds new ones */
696 arch_initcall(customize_machine);
698 void __init setup_arch(char **cmdline_p)
700 struct tag *tags = (struct tag *)&init_tags;
701 struct machine_desc *mdesc;
702 char *from = default_command_line;
707 mdesc = setup_machine(machine_arch_type);
708 machine_name = mdesc->name;
710 if (mdesc->soft_reboot)
714 tags = phys_to_virt(__atags_pointer);
715 else if (mdesc->boot_params)
716 tags = phys_to_virt(mdesc->boot_params);
719 * If we have the old style parameters, convert them to
722 if (tags->hdr.tag != ATAG_CORE)
723 convert_to_tag_list(tags);
724 if (tags->hdr.tag != ATAG_CORE)
725 tags = (struct tag *)&init_tags;
728 mdesc->fixup(mdesc, tags, &from, &meminfo);
730 if (tags->hdr.tag == ATAG_CORE) {
731 if (meminfo.nr_banks != 0)
732 squash_mem_tags(tags);
737 init_mm.start_code = (unsigned long) _text;
738 init_mm.end_code = (unsigned long) _etext;
739 init_mm.end_data = (unsigned long) _edata;
740 init_mm.brk = (unsigned long) _end;
742 memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
743 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
744 parse_cmdline(cmdline_p, from);
746 request_standard_resources(&meminfo, mdesc);
756 * Set up various architecture-specific pointers
758 init_arch_irq = mdesc->init_irq;
759 system_timer = mdesc->timer;
760 init_machine = mdesc->init_machine;
763 #if defined(CONFIG_VGA_CONSOLE)
764 conswitchp = &vga_con;
765 #elif defined(CONFIG_DUMMY_CONSOLE)
766 conswitchp = &dummy_con;
773 static int __init topology_init(void)
777 for_each_possible_cpu(cpu) {
778 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
779 cpuinfo->cpu.hotpluggable = 1;
780 register_cpu(&cpuinfo->cpu, cpu);
786 subsys_initcall(topology_init);
788 static const char *hwcap_str[] = {
807 static int c_show(struct seq_file *m, void *v)
811 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
812 cpu_name, read_cpuid_id() & 15, elf_platform);
814 #if defined(CONFIG_SMP)
815 for_each_online_cpu(i) {
817 * glibc reads /proc/cpuinfo to determine the number of
818 * online processors, looking for lines beginning with
819 * "processor". Give glibc what it expects.
821 seq_printf(m, "processor\t: %d\n", i);
822 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
823 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
824 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
826 #else /* CONFIG_SMP */
827 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
828 loops_per_jiffy / (500000/HZ),
829 (loops_per_jiffy / (5000/HZ)) % 100);
832 /* dump out the processor features */
833 seq_puts(m, "Features\t: ");
835 for (i = 0; hwcap_str[i]; i++)
836 if (elf_hwcap & (1 << i))
837 seq_printf(m, "%s ", hwcap_str[i]);
839 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
840 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
842 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
844 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
846 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
848 seq_printf(m, "CPU variant\t: 0x%02x\n",
849 (read_cpuid_id() >> 16) & 127);
852 seq_printf(m, "CPU variant\t: 0x%x\n",
853 (read_cpuid_id() >> 20) & 15);
855 seq_printf(m, "CPU part\t: 0x%03x\n",
856 (read_cpuid_id() >> 4) & 0xfff);
858 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
862 seq_printf(m, "Hardware\t: %s\n", machine_name);
863 seq_printf(m, "Revision\t: %04x\n", system_rev);
864 seq_printf(m, "Serial\t\t: %08x%08x\n",
865 system_serial_high, system_serial_low);
870 static void *c_start(struct seq_file *m, loff_t *pos)
872 return *pos < 1 ? (void *)1 : NULL;
875 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
881 static void c_stop(struct seq_file *m, void *v)
885 const struct seq_operations cpuinfo_op = {