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 feat_v6_fixup(void)
274 int id = read_cpuid_id();
276 if ((id & 0xff0f0000) != 0x41070000)
280 * HWCAP_TLS is available only on 1136 r1p0 and later,
281 * see also kuser_get_tls_init.
283 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
284 elf_hwcap &= ~HWCAP_TLS;
287 static void __init setup_processor(void)
289 struct proc_info_list *list;
292 * locate processor in the list of supported processor
293 * types. The linker builds this table for us from the
294 * entries in arch/arm/mm/proc-*.S
296 list = lookup_processor_type(read_cpuid_id());
298 printk("CPU configuration botched (ID %08x), unable "
299 "to continue.\n", read_cpuid_id());
303 cpu_name = list->cpu_name;
306 processor = *list->proc;
309 cpu_tlb = *list->tlb;
312 cpu_user = *list->user;
315 cpu_cache = *list->cache;
318 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
319 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
320 proc_arch[cpu_architecture()], cr_alignment);
322 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
323 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
324 elf_hwcap = list->elf_hwcap;
325 #ifndef CONFIG_ARM_THUMB
326 elf_hwcap &= ~HWCAP_THUMB;
336 * cpu_init - initialise one CPU.
338 * cpu_init sets up the per-CPU stacks.
342 unsigned int cpu = smp_processor_id();
343 struct stack *stk = &stacks[cpu];
345 if (cpu >= NR_CPUS) {
346 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
351 * Define the placement constraint for the inline asm directive below.
352 * In Thumb-2, msr with an immediate value is not allowed.
354 #ifdef CONFIG_THUMB2_KERNEL
361 * setup stacks for re-entrant exception handlers
365 "add r14, %0, %2\n\t"
368 "add r14, %0, %4\n\t"
371 "add r14, %0, %6\n\t"
376 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
377 "I" (offsetof(struct stack, irq[0])),
378 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
379 "I" (offsetof(struct stack, abt[0])),
380 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
381 "I" (offsetof(struct stack, und[0])),
382 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
386 static struct machine_desc * __init setup_machine(unsigned int nr)
388 struct machine_desc *list;
391 * locate machine in the list of supported machines.
393 list = lookup_machine_type(nr);
395 printk("Machine configuration botched (nr %d), unable "
396 "to continue.\n", nr);
400 printk("Machine: %s\n", list->name);
405 static int __init arm_add_memory(unsigned long start, unsigned long size)
407 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
409 if (meminfo.nr_banks >= NR_BANKS) {
410 printk(KERN_CRIT "NR_BANKS too low, "
411 "ignoring memory at %#lx\n", start);
416 * Ensure that start/size are aligned to a page boundary.
417 * Size is appropriately rounded down, start is rounded up.
419 size -= start & ~PAGE_MASK;
420 bank->start = PAGE_ALIGN(start);
421 bank->size = size & PAGE_MASK;
422 bank->node = PHYS_TO_NID(start);
425 * Check whether this memory region has non-zero size or
426 * invalid node number.
428 if (bank->size == 0 || bank->node >= MAX_NUMNODES)
436 * Pick out the memory size. We look for mem=size@start,
437 * where start and size are "size[KkMm]"
439 static int __init early_mem(char *p)
441 static int usermem __initdata = 0;
442 unsigned long size, start;
446 * If the user specifies memory size, we
447 * blow away any automatically generated
452 meminfo.nr_banks = 0;
456 size = memparse(p, &endp);
458 start = memparse(endp + 1, NULL);
460 arm_add_memory(start, size);
464 early_param("mem", early_mem);
467 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
469 #ifdef CONFIG_BLK_DEV_RAM
470 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
472 rd_image_start = image_start;
482 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
484 struct resource *res;
487 kernel_code.start = virt_to_phys(_text);
488 kernel_code.end = virt_to_phys(_etext - 1);
489 kernel_data.start = virt_to_phys(_data);
490 kernel_data.end = virt_to_phys(_end - 1);
492 for (i = 0; i < mi->nr_banks; i++) {
493 if (mi->bank[i].size == 0)
496 res = alloc_bootmem_low(sizeof(*res));
497 res->name = "System RAM";
498 res->start = mi->bank[i].start;
499 res->end = mi->bank[i].start + mi->bank[i].size - 1;
500 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
502 request_resource(&iomem_resource, res);
504 if (kernel_code.start >= res->start &&
505 kernel_code.end <= res->end)
506 request_resource(res, &kernel_code);
507 if (kernel_data.start >= res->start &&
508 kernel_data.end <= res->end)
509 request_resource(res, &kernel_data);
512 if (mdesc->video_start) {
513 video_ram.start = mdesc->video_start;
514 video_ram.end = mdesc->video_end;
515 request_resource(&iomem_resource, &video_ram);
519 * Some machines don't have the possibility of ever
520 * possessing lp0, lp1 or lp2
522 if (mdesc->reserve_lp0)
523 request_resource(&ioport_resource, &lp0);
524 if (mdesc->reserve_lp1)
525 request_resource(&ioport_resource, &lp1);
526 if (mdesc->reserve_lp2)
527 request_resource(&ioport_resource, &lp2);
533 * This is the new way of passing data to the kernel at boot time. Rather
534 * than passing a fixed inflexible structure to the kernel, we pass a list
535 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
536 * tag for the list to be recognised (to distinguish the tagged list from
537 * a param_struct). The list is terminated with a zero-length tag (this tag
538 * is not parsed in any way).
540 static int __init parse_tag_core(const struct tag *tag)
542 if (tag->hdr.size > 2) {
543 if ((tag->u.core.flags & 1) == 0)
544 root_mountflags &= ~MS_RDONLY;
545 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
550 __tagtable(ATAG_CORE, parse_tag_core);
552 static int __init parse_tag_mem32(const struct tag *tag)
554 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
557 __tagtable(ATAG_MEM, parse_tag_mem32);
559 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
560 struct screen_info screen_info = {
561 .orig_video_lines = 30,
562 .orig_video_cols = 80,
563 .orig_video_mode = 0,
564 .orig_video_ega_bx = 0,
565 .orig_video_isVGA = 1,
566 .orig_video_points = 8
569 static int __init parse_tag_videotext(const struct tag *tag)
571 screen_info.orig_x = tag->u.videotext.x;
572 screen_info.orig_y = tag->u.videotext.y;
573 screen_info.orig_video_page = tag->u.videotext.video_page;
574 screen_info.orig_video_mode = tag->u.videotext.video_mode;
575 screen_info.orig_video_cols = tag->u.videotext.video_cols;
576 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
577 screen_info.orig_video_lines = tag->u.videotext.video_lines;
578 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
579 screen_info.orig_video_points = tag->u.videotext.video_points;
583 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
586 static int __init parse_tag_ramdisk(const struct tag *tag)
588 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
589 (tag->u.ramdisk.flags & 2) == 0,
590 tag->u.ramdisk.start, tag->u.ramdisk.size);
594 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
596 static int __init parse_tag_serialnr(const struct tag *tag)
598 system_serial_low = tag->u.serialnr.low;
599 system_serial_high = tag->u.serialnr.high;
603 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
605 static int __init parse_tag_revision(const struct tag *tag)
607 system_rev = tag->u.revision.rev;
611 __tagtable(ATAG_REVISION, parse_tag_revision);
613 #ifndef CONFIG_CMDLINE_FORCE
614 static int __init parse_tag_cmdline(const struct tag *tag)
616 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
620 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
621 #endif /* CONFIG_CMDLINE_FORCE */
624 * Scan the tag table for this tag, and call its parse function.
625 * The tag table is built by the linker from all the __tagtable
628 static int __init parse_tag(const struct tag *tag)
630 extern struct tagtable __tagtable_begin, __tagtable_end;
633 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
634 if (tag->hdr.tag == t->tag) {
639 return t < &__tagtable_end;
643 * Parse all tags in the list, checking both the global and architecture
644 * specific tag tables.
646 static void __init parse_tags(const struct tag *t)
648 for (; t->hdr.size; t = tag_next(t))
651 "Ignoring unrecognised tag 0x%08x\n",
656 * This holds our defaults.
658 static struct init_tags {
659 struct tag_header hdr1;
660 struct tag_core core;
661 struct tag_header hdr2;
662 struct tag_mem32 mem;
663 struct tag_header hdr3;
664 } init_tags __initdata = {
665 { tag_size(tag_core), ATAG_CORE },
666 { 1, PAGE_SIZE, 0xff },
667 { tag_size(tag_mem32), ATAG_MEM },
668 { MEM_SIZE, PHYS_OFFSET },
672 static void (*init_machine)(void) __initdata;
674 static int __init customize_machine(void)
676 /* customizes platform devices, or adds new ones */
681 arch_initcall(customize_machine);
683 void __init setup_arch(char **cmdline_p)
685 struct tag *tags = (struct tag *)&init_tags;
686 struct machine_desc *mdesc;
687 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 /* parse_early_param needs a boot_command_line */
728 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
730 /* populate cmd_line too for later use, preserving boot_command_line */
731 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
732 *cmdline_p = cmd_line;
737 request_standard_resources(&meminfo, mdesc);
747 * Set up various architecture-specific pointers
749 arch_nr_irqs = mdesc->nr_irqs;
750 init_arch_irq = mdesc->init_irq;
751 system_timer = mdesc->timer;
752 init_machine = mdesc->init_machine;
755 #if defined(CONFIG_VGA_CONSOLE)
756 conswitchp = &vga_con;
757 #elif defined(CONFIG_DUMMY_CONSOLE)
758 conswitchp = &dummy_con;
765 static int __init topology_init(void)
769 for_each_possible_cpu(cpu) {
770 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
771 cpuinfo->cpu.hotpluggable = 1;
772 register_cpu(&cpuinfo->cpu, cpu);
777 subsys_initcall(topology_init);
779 #ifdef CONFIG_HAVE_PROC_CPU
780 static int __init proc_cpu_init(void)
782 struct proc_dir_entry *res;
784 res = proc_mkdir("cpu", NULL);
789 fs_initcall(proc_cpu_init);
792 static const char *hwcap_str[] = {
811 static int c_show(struct seq_file *m, void *v)
815 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
816 cpu_name, read_cpuid_id() & 15, elf_platform);
818 #if defined(CONFIG_SMP)
819 for_each_online_cpu(i) {
821 * glibc reads /proc/cpuinfo to determine the number of
822 * online processors, looking for lines beginning with
823 * "processor". Give glibc what it expects.
825 seq_printf(m, "processor\t: %d\n", i);
826 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
827 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
828 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
830 #else /* CONFIG_SMP */
831 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
832 loops_per_jiffy / (500000/HZ),
833 (loops_per_jiffy / (5000/HZ)) % 100);
836 /* dump out the processor features */
837 seq_puts(m, "Features\t: ");
839 for (i = 0; hwcap_str[i]; i++)
840 if (elf_hwcap & (1 << i))
841 seq_printf(m, "%s ", hwcap_str[i]);
843 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
844 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
846 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
848 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
850 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
852 seq_printf(m, "CPU variant\t: 0x%02x\n",
853 (read_cpuid_id() >> 16) & 127);
856 seq_printf(m, "CPU variant\t: 0x%x\n",
857 (read_cpuid_id() >> 20) & 15);
859 seq_printf(m, "CPU part\t: 0x%03x\n",
860 (read_cpuid_id() >> 4) & 0xfff);
862 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
866 seq_printf(m, "Hardware\t: %s\n", machine_name);
867 seq_printf(m, "Revision\t: %04x\n", system_rev);
868 seq_printf(m, "Serial\t\t: %08x%08x\n",
869 system_serial_high, system_serial_low);
874 static void *c_start(struct seq_file *m, loff_t *pos)
876 return *pos < 1 ? (void *)1 : NULL;
879 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
885 static void c_stop(struct seq_file *m, void *v)
889 const struct seq_operations cpuinfo_op = {