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;
254 * These functions re-use the assembly code in head.S, which
255 * already provide the required functionality.
257 extern struct proc_info_list *lookup_processor_type(unsigned int);
258 extern struct machine_desc *lookup_machine_type(unsigned int);
260 static void __init setup_processor(void)
262 struct proc_info_list *list;
265 * locate processor in the list of supported processor
266 * types. The linker builds this table for us from the
267 * entries in arch/arm/mm/proc-*.S
269 list = lookup_processor_type(read_cpuid_id());
271 printk("CPU configuration botched (ID %08x), unable "
272 "to continue.\n", read_cpuid_id());
276 cpu_name = list->cpu_name;
279 processor = *list->proc;
282 cpu_tlb = *list->tlb;
285 cpu_user = *list->user;
288 cpu_cache = *list->cache;
291 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
292 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
293 proc_arch[cpu_architecture()], cr_alignment);
295 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
296 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
297 elf_hwcap = list->elf_hwcap;
298 #ifndef CONFIG_ARM_THUMB
299 elf_hwcap &= ~HWCAP_THUMB;
307 * cpu_init - initialise one CPU.
309 * cpu_init sets up the per-CPU stacks.
313 unsigned int cpu = smp_processor_id();
314 struct stack *stk = &stacks[cpu];
316 if (cpu >= NR_CPUS) {
317 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
322 * setup stacks for re-entrant exception handlers
334 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
335 "I" (offsetof(struct stack, irq[0])),
336 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
337 "I" (offsetof(struct stack, abt[0])),
338 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
339 "I" (offsetof(struct stack, und[0])),
340 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
344 static struct machine_desc * __init setup_machine(unsigned int nr)
346 struct machine_desc *list;
349 * locate machine in the list of supported machines.
351 list = lookup_machine_type(nr);
353 printk("Machine configuration botched (nr %d), unable "
354 "to continue.\n", nr);
358 printk("Machine: %s\n", list->name);
363 static void __init arm_add_memory(unsigned long start, unsigned long size)
365 struct membank *bank;
368 * Ensure that start/size are aligned to a page boundary.
369 * Size is appropriately rounded down, start is rounded up.
371 size -= start & ~PAGE_MASK;
373 bank = &meminfo.bank[meminfo.nr_banks++];
375 bank->start = PAGE_ALIGN(start);
376 bank->size = size & PAGE_MASK;
377 bank->node = PHYS_TO_NID(start);
381 * Pick out the memory size. We look for mem=size@start,
382 * where start and size are "size[KkMm]"
384 static void __init early_mem(char **p)
386 static int usermem __initdata = 0;
387 unsigned long size, start;
390 * If the user specifies memory size, we
391 * blow away any automatically generated
396 meminfo.nr_banks = 0;
400 size = memparse(*p, p);
402 start = memparse(*p + 1, p);
404 arm_add_memory(start, size);
406 __early_param("mem=", early_mem);
409 * vmalloc=size forces the vmalloc area to be exactly 'size'
410 * bytes. This can be used to increase (or decrease) the vmalloc
411 * area - the default is 128m.
413 static void __init early_vmalloc(char **arg)
415 vmalloc_reserve = memparse(*arg, arg);
417 __early_param("vmalloc=", early_vmalloc);
420 * Initial parsing of the command line.
422 static void __init parse_cmdline(char **cmdline_p, char *from)
424 char c = ' ', *to = command_line;
429 extern struct early_params __early_begin, __early_end;
430 struct early_params *p;
432 for (p = &__early_begin; p < &__early_end; p++) {
433 int arglen = strlen(p->arg);
435 if (memcmp(from, p->arg, arglen) == 0) {
436 if (to != command_line)
441 while (*from != ' ' && *from != '\0')
450 if (COMMAND_LINE_SIZE <= ++len)
455 *cmdline_p = command_line;
459 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
461 #ifdef CONFIG_BLK_DEV_RAM
462 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
464 rd_image_start = image_start;
474 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
476 struct resource *res;
479 kernel_code.start = virt_to_phys(&_text);
480 kernel_code.end = virt_to_phys(&_etext - 1);
481 kernel_data.start = virt_to_phys(&__data_start);
482 kernel_data.end = virt_to_phys(&_end - 1);
484 for (i = 0; i < mi->nr_banks; i++) {
485 unsigned long virt_start, virt_end;
487 if (mi->bank[i].size == 0)
490 virt_start = __phys_to_virt(mi->bank[i].start);
491 virt_end = virt_start + mi->bank[i].size - 1;
493 res = alloc_bootmem_low(sizeof(*res));
494 res->name = "System RAM";
495 res->start = __virt_to_phys(virt_start);
496 res->end = __virt_to_phys(virt_end);
497 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
499 request_resource(&iomem_resource, res);
501 if (kernel_code.start >= res->start &&
502 kernel_code.end <= res->end)
503 request_resource(res, &kernel_code);
504 if (kernel_data.start >= res->start &&
505 kernel_data.end <= res->end)
506 request_resource(res, &kernel_data);
509 if (mdesc->video_start) {
510 video_ram.start = mdesc->video_start;
511 video_ram.end = mdesc->video_end;
512 request_resource(&iomem_resource, &video_ram);
516 * Some machines don't have the possibility of ever
517 * possessing lp0, lp1 or lp2
519 if (mdesc->reserve_lp0)
520 request_resource(&ioport_resource, &lp0);
521 if (mdesc->reserve_lp1)
522 request_resource(&ioport_resource, &lp1);
523 if (mdesc->reserve_lp2)
524 request_resource(&ioport_resource, &lp2);
530 * This is the new way of passing data to the kernel at boot time. Rather
531 * than passing a fixed inflexible structure to the kernel, we pass a list
532 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
533 * tag for the list to be recognised (to distinguish the tagged list from
534 * a param_struct). The list is terminated with a zero-length tag (this tag
535 * is not parsed in any way).
537 static int __init parse_tag_core(const struct tag *tag)
539 if (tag->hdr.size > 2) {
540 if ((tag->u.core.flags & 1) == 0)
541 root_mountflags &= ~MS_RDONLY;
542 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
547 __tagtable(ATAG_CORE, parse_tag_core);
549 static int __init parse_tag_mem32(const struct tag *tag)
551 if (meminfo.nr_banks >= NR_BANKS) {
553 "Ignoring memory bank 0x%08x size %dKB\n",
554 tag->u.mem.start, tag->u.mem.size / 1024);
557 arm_add_memory(tag->u.mem.start, tag->u.mem.size);
561 __tagtable(ATAG_MEM, parse_tag_mem32);
563 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
564 struct screen_info screen_info = {
565 .orig_video_lines = 30,
566 .orig_video_cols = 80,
567 .orig_video_mode = 0,
568 .orig_video_ega_bx = 0,
569 .orig_video_isVGA = 1,
570 .orig_video_points = 8
573 static int __init parse_tag_videotext(const struct tag *tag)
575 screen_info.orig_x = tag->u.videotext.x;
576 screen_info.orig_y = tag->u.videotext.y;
577 screen_info.orig_video_page = tag->u.videotext.video_page;
578 screen_info.orig_video_mode = tag->u.videotext.video_mode;
579 screen_info.orig_video_cols = tag->u.videotext.video_cols;
580 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
581 screen_info.orig_video_lines = tag->u.videotext.video_lines;
582 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
583 screen_info.orig_video_points = tag->u.videotext.video_points;
587 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
590 static int __init parse_tag_ramdisk(const struct tag *tag)
592 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
593 (tag->u.ramdisk.flags & 2) == 0,
594 tag->u.ramdisk.start, tag->u.ramdisk.size);
598 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
600 static int __init parse_tag_serialnr(const struct tag *tag)
602 system_serial_low = tag->u.serialnr.low;
603 system_serial_high = tag->u.serialnr.high;
607 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
609 static int __init parse_tag_revision(const struct tag *tag)
611 system_rev = tag->u.revision.rev;
615 __tagtable(ATAG_REVISION, parse_tag_revision);
617 static int __init parse_tag_cmdline(const struct tag *tag)
619 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
623 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
626 * Scan the tag table for this tag, and call its parse function.
627 * The tag table is built by the linker from all the __tagtable
630 static int __init parse_tag(const struct tag *tag)
632 extern struct tagtable __tagtable_begin, __tagtable_end;
635 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
636 if (tag->hdr.tag == t->tag) {
641 return t < &__tagtable_end;
645 * Parse all tags in the list, checking both the global and architecture
646 * specific tag tables.
648 static void __init parse_tags(const struct tag *t)
650 for (; t->hdr.size; t = tag_next(t))
653 "Ignoring unrecognised tag 0x%08x\n",
658 * This holds our defaults.
660 static struct init_tags {
661 struct tag_header hdr1;
662 struct tag_core core;
663 struct tag_header hdr2;
664 struct tag_mem32 mem;
665 struct tag_header hdr3;
666 } init_tags __initdata = {
667 { tag_size(tag_core), ATAG_CORE },
668 { 1, PAGE_SIZE, 0xff },
669 { tag_size(tag_mem32), ATAG_MEM },
670 { MEM_SIZE, PHYS_OFFSET },
674 static void (*init_machine)(void) __initdata;
676 static int __init customize_machine(void)
678 /* customizes platform devices, or adds new ones */
683 arch_initcall(customize_machine);
685 void __init setup_arch(char **cmdline_p)
687 struct tag *tags = (struct tag *)&init_tags;
688 struct machine_desc *mdesc;
689 char *from = default_command_line;
692 mdesc = setup_machine(machine_arch_type);
693 machine_name = mdesc->name;
695 if (mdesc->soft_reboot)
699 tags = phys_to_virt(__atags_pointer);
700 else if (mdesc->boot_params)
701 tags = phys_to_virt(mdesc->boot_params);
704 * If we have the old style parameters, convert them to
707 if (tags->hdr.tag != ATAG_CORE)
708 convert_to_tag_list(tags);
709 if (tags->hdr.tag != ATAG_CORE)
710 tags = (struct tag *)&init_tags;
713 mdesc->fixup(mdesc, tags, &from, &meminfo);
715 if (tags->hdr.tag == ATAG_CORE) {
716 if (meminfo.nr_banks != 0)
717 squash_mem_tags(tags);
722 init_mm.start_code = (unsigned long) &_text;
723 init_mm.end_code = (unsigned long) &_etext;
724 init_mm.end_data = (unsigned long) &_edata;
725 init_mm.brk = (unsigned long) &_end;
727 memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
728 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
729 parse_cmdline(cmdline_p, from);
730 paging_init(&meminfo, mdesc);
731 request_standard_resources(&meminfo, mdesc);
740 * Set up various architecture-specific pointers
742 init_arch_irq = mdesc->init_irq;
743 system_timer = mdesc->timer;
744 init_machine = mdesc->init_machine;
747 #if defined(CONFIG_VGA_CONSOLE)
748 conswitchp = &vga_con;
749 #elif defined(CONFIG_DUMMY_CONSOLE)
750 conswitchp = &dummy_con;
757 static int __init topology_init(void)
761 for_each_possible_cpu(cpu) {
762 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
763 cpuinfo->cpu.hotpluggable = 1;
764 register_cpu(&cpuinfo->cpu, cpu);
770 subsys_initcall(topology_init);
772 static const char *hwcap_str[] = {
787 static int c_show(struct seq_file *m, void *v)
791 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
792 cpu_name, read_cpuid_id() & 15, elf_platform);
794 #if defined(CONFIG_SMP)
795 for_each_online_cpu(i) {
797 * glibc reads /proc/cpuinfo to determine the number of
798 * online processors, looking for lines beginning with
799 * "processor". Give glibc what it expects.
801 seq_printf(m, "processor\t: %d\n", i);
802 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
803 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
804 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
806 #else /* CONFIG_SMP */
807 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
808 loops_per_jiffy / (500000/HZ),
809 (loops_per_jiffy / (5000/HZ)) % 100);
812 /* dump out the processor features */
813 seq_puts(m, "Features\t: ");
815 for (i = 0; hwcap_str[i]; i++)
816 if (elf_hwcap & (1 << i))
817 seq_printf(m, "%s ", hwcap_str[i]);
819 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
820 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
822 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
824 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
826 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
828 seq_printf(m, "CPU variant\t: 0x%02x\n",
829 (read_cpuid_id() >> 16) & 127);
832 seq_printf(m, "CPU variant\t: 0x%x\n",
833 (read_cpuid_id() >> 20) & 15);
835 seq_printf(m, "CPU part\t: 0x%03x\n",
836 (read_cpuid_id() >> 4) & 0xfff);
838 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
842 seq_printf(m, "Hardware\t: %s\n", machine_name);
843 seq_printf(m, "Revision\t: %04x\n", system_rev);
844 seq_printf(m, "Serial\t\t: %08x%08x\n",
845 system_serial_high, system_serial_low);
850 static void *c_start(struct seq_file *m, loff_t *pos)
852 return *pos < 1 ? (void *)1 : NULL;
855 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
861 static void c_stop(struct seq_file *m, void *v)
865 const struct seq_operations cpuinfo_op = {