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/export.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/kexec.h>
23 #include <linux/of_fdt.h>
24 #include <linux/root_dev.h>
25 #include <linux/cpu.h>
26 #include <linux/interrupt.h>
27 #include <linux/smp.h>
29 #include <linux/proc_fs.h>
30 #include <linux/memblock.h>
31 #include <linux/bug.h>
32 #include <linux/compiler.h>
33 #include <linux/sort.h>
35 #include <asm/unified.h>
38 #include <asm/cputype.h>
40 #include <asm/procinfo.h>
41 #include <asm/sections.h>
42 #include <asm/setup.h>
43 #include <asm/smp_plat.h>
44 #include <asm/mach-types.h>
45 #include <asm/cacheflush.h>
46 #include <asm/cachetype.h>
47 #include <asm/tlbflush.h>
50 #include <asm/mach/arch.h>
51 #include <asm/mach/irq.h>
52 #include <asm/mach/time.h>
53 #include <asm/system_info.h>
54 #include <asm/system_misc.h>
55 #include <asm/traps.h>
56 #include <asm/unwind.h>
57 #include <asm/memblock.h>
59 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
66 #define MEM_SIZE (16*1024*1024)
69 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
72 static int __init fpe_setup(char *line)
74 memcpy(fpe_type, line, 8);
78 __setup("fpe=", fpe_setup);
81 extern void paging_init(struct machine_desc *desc);
82 extern void sanity_check_meminfo(void);
83 extern void reboot_setup(char *str);
84 extern void setup_dma_zone(struct machine_desc *desc);
86 unsigned int processor_id;
87 EXPORT_SYMBOL(processor_id);
88 unsigned int __machine_arch_type __read_mostly;
89 EXPORT_SYMBOL(__machine_arch_type);
90 unsigned int cacheid __read_mostly;
91 EXPORT_SYMBOL(cacheid);
93 unsigned int __atags_pointer __initdata;
95 unsigned int system_rev;
96 EXPORT_SYMBOL(system_rev);
98 unsigned int system_serial_low;
99 EXPORT_SYMBOL(system_serial_low);
101 unsigned int system_serial_high;
102 EXPORT_SYMBOL(system_serial_high);
104 unsigned int elf_hwcap __read_mostly;
105 EXPORT_SYMBOL(elf_hwcap);
109 struct processor processor __read_mostly;
112 struct cpu_tlb_fns cpu_tlb __read_mostly;
115 struct cpu_user_fns cpu_user __read_mostly;
118 struct cpu_cache_fns cpu_cache __read_mostly;
120 #ifdef CONFIG_OUTER_CACHE
121 struct outer_cache_fns outer_cache __read_mostly;
122 EXPORT_SYMBOL(outer_cache);
126 * Cached cpu_architecture() result for use by assembler code.
127 * C code should use the cpu_architecture() function instead of accessing this
130 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
136 } ____cacheline_aligned;
138 static struct stack stacks[NR_CPUS];
140 char elf_platform[ELF_PLATFORM_SIZE];
141 EXPORT_SYMBOL(elf_platform);
143 static const char *cpu_name;
144 static const char *machine_name;
145 static char __initdata cmd_line[COMMAND_LINE_SIZE];
146 struct machine_desc *machine_desc __initdata;
148 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
149 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
150 #define ENDIANNESS ((char)endian_test.l)
152 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
155 * Standard memory resources
157 static struct resource mem_res[] = {
162 .flags = IORESOURCE_MEM
165 .name = "Kernel code",
168 .flags = IORESOURCE_MEM
171 .name = "Kernel data",
174 .flags = IORESOURCE_MEM
178 #define video_ram mem_res[0]
179 #define kernel_code mem_res[1]
180 #define kernel_data mem_res[2]
182 static struct resource io_res[] = {
187 .flags = IORESOURCE_IO | IORESOURCE_BUSY
193 .flags = IORESOURCE_IO | IORESOURCE_BUSY
199 .flags = IORESOURCE_IO | IORESOURCE_BUSY
203 #define lp0 io_res[0]
204 #define lp1 io_res[1]
205 #define lp2 io_res[2]
207 static const char *proc_arch[] = {
227 static int __get_cpu_architecture(void)
231 if ((read_cpuid_id() & 0x0008f000) == 0) {
232 cpu_arch = CPU_ARCH_UNKNOWN;
233 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
234 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
235 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
236 cpu_arch = (read_cpuid_id() >> 16) & 7;
238 cpu_arch += CPU_ARCH_ARMv3;
239 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
242 /* Revised CPUID format. Read the Memory Model Feature
243 * Register 0 and check for VMSAv7 or PMSAv7 */
244 asm("mrc p15, 0, %0, c0, c1, 4"
246 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
247 (mmfr0 & 0x000000f0) >= 0x00000030)
248 cpu_arch = CPU_ARCH_ARMv7;
249 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
250 (mmfr0 & 0x000000f0) == 0x00000020)
251 cpu_arch = CPU_ARCH_ARMv6;
253 cpu_arch = CPU_ARCH_UNKNOWN;
255 cpu_arch = CPU_ARCH_UNKNOWN;
260 int __pure cpu_architecture(void)
262 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
264 return __cpu_architecture;
267 static int cpu_has_aliasing_icache(unsigned int arch)
270 unsigned int id_reg, num_sets, line_size;
272 /* PIPT caches never alias. */
273 if (icache_is_pipt())
276 /* arch specifies the register format */
279 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
280 : /* No output operands */
283 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
285 line_size = 4 << ((id_reg & 0x7) + 2);
286 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
287 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
290 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
293 /* I-cache aliases will be handled by D-cache aliasing code */
297 return aliasing_icache;
300 static void __init cacheid_init(void)
302 unsigned int cachetype = read_cpuid_cachetype();
303 unsigned int arch = cpu_architecture();
305 if (arch >= CPU_ARCH_ARMv6) {
306 if ((cachetype & (7 << 29)) == 4 << 29) {
307 /* ARMv7 register format */
308 arch = CPU_ARCH_ARMv7;
309 cacheid = CACHEID_VIPT_NONALIASING;
310 switch (cachetype & (3 << 14)) {
312 cacheid |= CACHEID_ASID_TAGGED;
315 cacheid |= CACHEID_PIPT;
319 arch = CPU_ARCH_ARMv6;
320 if (cachetype & (1 << 23))
321 cacheid = CACHEID_VIPT_ALIASING;
323 cacheid = CACHEID_VIPT_NONALIASING;
325 if (cpu_has_aliasing_icache(arch))
326 cacheid |= CACHEID_VIPT_I_ALIASING;
328 cacheid = CACHEID_VIVT;
331 printk("CPU: %s data cache, %s instruction cache\n",
332 cache_is_vivt() ? "VIVT" :
333 cache_is_vipt_aliasing() ? "VIPT aliasing" :
334 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
335 cache_is_vivt() ? "VIVT" :
336 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
337 icache_is_vipt_aliasing() ? "VIPT aliasing" :
338 icache_is_pipt() ? "PIPT" :
339 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
343 * These functions re-use the assembly code in head.S, which
344 * already provide the required functionality.
346 extern struct proc_info_list *lookup_processor_type(unsigned int);
348 void __init early_print(const char *str, ...)
350 extern void printascii(const char *);
355 vsnprintf(buf, sizeof(buf), str, ap);
358 #ifdef CONFIG_DEBUG_LL
364 static void __init feat_v6_fixup(void)
366 int id = read_cpuid_id();
368 if ((id & 0xff0f0000) != 0x41070000)
372 * HWCAP_TLS is available only on 1136 r1p0 and later,
373 * see also kuser_get_tls_init.
375 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
376 elf_hwcap &= ~HWCAP_TLS;
380 * cpu_init - initialise one CPU.
382 * cpu_init sets up the per-CPU stacks.
386 unsigned int cpu = smp_processor_id();
387 struct stack *stk = &stacks[cpu];
389 if (cpu >= NR_CPUS) {
390 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
397 * Define the placement constraint for the inline asm directive below.
398 * In Thumb-2, msr with an immediate value is not allowed.
400 #ifdef CONFIG_THUMB2_KERNEL
407 * setup stacks for re-entrant exception handlers
411 "add r14, %0, %2\n\t"
414 "add r14, %0, %4\n\t"
417 "add r14, %0, %6\n\t"
422 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
423 "I" (offsetof(struct stack, irq[0])),
424 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
425 "I" (offsetof(struct stack, abt[0])),
426 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
427 "I" (offsetof(struct stack, und[0])),
428 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
432 int __cpu_logical_map[NR_CPUS];
434 void __init smp_setup_processor_id(void)
437 u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
439 cpu_logical_map(0) = cpu;
440 for (i = 1; i < NR_CPUS; ++i)
441 cpu_logical_map(i) = i == cpu ? 0 : i;
443 printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
446 static void __init setup_processor(void)
448 struct proc_info_list *list;
451 * locate processor in the list of supported processor
452 * types. The linker builds this table for us from the
453 * entries in arch/arm/mm/proc-*.S
455 list = lookup_processor_type(read_cpuid_id());
457 printk("CPU configuration botched (ID %08x), unable "
458 "to continue.\n", read_cpuid_id());
462 cpu_name = list->cpu_name;
463 __cpu_architecture = __get_cpu_architecture();
466 processor = *list->proc;
469 cpu_tlb = *list->tlb;
472 cpu_user = *list->user;
475 cpu_cache = *list->cache;
478 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
479 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
480 proc_arch[cpu_architecture()], cr_alignment);
482 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
483 list->arch_name, ENDIANNESS);
484 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
485 list->elf_name, ENDIANNESS);
486 elf_hwcap = list->elf_hwcap;
487 #ifndef CONFIG_ARM_THUMB
488 elf_hwcap &= ~HWCAP_THUMB;
497 void __init dump_machine_table(void)
499 struct machine_desc *p;
501 early_print("Available machine support:\n\nID (hex)\tNAME\n");
502 for_each_machine_desc(p)
503 early_print("%08x\t%s\n", p->nr, p->name);
505 early_print("\nPlease check your kernel config and/or bootloader.\n");
508 /* can't use cpu_relax() here as it may require MMU setup */;
511 int __init arm_add_memory(phys_addr_t start, unsigned long size)
513 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
515 if (meminfo.nr_banks >= NR_BANKS) {
516 printk(KERN_CRIT "NR_BANKS too low, "
517 "ignoring memory at 0x%08llx\n", (long long)start);
522 * Ensure that start/size are aligned to a page boundary.
523 * Size is appropriately rounded down, start is rounded up.
525 size -= start & ~PAGE_MASK;
526 bank->start = PAGE_ALIGN(start);
529 if (bank->start + size < bank->start) {
530 printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
531 "32-bit physical address space\n", (long long)start);
533 * To ensure bank->start + bank->size is representable in
534 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
535 * This means we lose a page after masking.
537 size = ULONG_MAX - bank->start;
541 bank->size = size & PAGE_MASK;
544 * Check whether this memory region has non-zero size or
545 * invalid node number.
555 * Pick out the memory size. We look for mem=size@start,
556 * where start and size are "size[KkMm]"
558 static int __init early_mem(char *p)
560 static int usermem __initdata = 0;
566 * If the user specifies memory size, we
567 * blow away any automatically generated
572 meminfo.nr_banks = 0;
576 size = memparse(p, &endp);
578 start = memparse(endp + 1, NULL);
580 arm_add_memory(start, size);
584 early_param("mem", early_mem);
587 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
589 #ifdef CONFIG_BLK_DEV_RAM
590 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
592 rd_image_start = image_start;
601 static void __init request_standard_resources(struct machine_desc *mdesc)
603 struct memblock_region *region;
604 struct resource *res;
606 kernel_code.start = virt_to_phys(_text);
607 kernel_code.end = virt_to_phys(_etext - 1);
608 kernel_data.start = virt_to_phys(_sdata);
609 kernel_data.end = virt_to_phys(_end - 1);
611 for_each_memblock(memory, region) {
612 res = alloc_bootmem_low(sizeof(*res));
613 res->name = "System RAM";
614 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
615 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
616 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
618 request_resource(&iomem_resource, res);
620 if (kernel_code.start >= res->start &&
621 kernel_code.end <= res->end)
622 request_resource(res, &kernel_code);
623 if (kernel_data.start >= res->start &&
624 kernel_data.end <= res->end)
625 request_resource(res, &kernel_data);
628 if (mdesc->video_start) {
629 video_ram.start = mdesc->video_start;
630 video_ram.end = mdesc->video_end;
631 request_resource(&iomem_resource, &video_ram);
635 * Some machines don't have the possibility of ever
636 * possessing lp0, lp1 or lp2
638 if (mdesc->reserve_lp0)
639 request_resource(&ioport_resource, &lp0);
640 if (mdesc->reserve_lp1)
641 request_resource(&ioport_resource, &lp1);
642 if (mdesc->reserve_lp2)
643 request_resource(&ioport_resource, &lp2);
649 * This is the new way of passing data to the kernel at boot time. Rather
650 * than passing a fixed inflexible structure to the kernel, we pass a list
651 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
652 * tag for the list to be recognised (to distinguish the tagged list from
653 * a param_struct). The list is terminated with a zero-length tag (this tag
654 * is not parsed in any way).
656 static int __init parse_tag_core(const struct tag *tag)
658 if (tag->hdr.size > 2) {
659 if ((tag->u.core.flags & 1) == 0)
660 root_mountflags &= ~MS_RDONLY;
661 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
666 __tagtable(ATAG_CORE, parse_tag_core);
668 static int __init parse_tag_mem32(const struct tag *tag)
670 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
673 __tagtable(ATAG_MEM, parse_tag_mem32);
675 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
676 struct screen_info screen_info = {
677 .orig_video_lines = 30,
678 .orig_video_cols = 80,
679 .orig_video_mode = 0,
680 .orig_video_ega_bx = 0,
681 .orig_video_isVGA = 1,
682 .orig_video_points = 8
685 static int __init parse_tag_videotext(const struct tag *tag)
687 screen_info.orig_x = tag->u.videotext.x;
688 screen_info.orig_y = tag->u.videotext.y;
689 screen_info.orig_video_page = tag->u.videotext.video_page;
690 screen_info.orig_video_mode = tag->u.videotext.video_mode;
691 screen_info.orig_video_cols = tag->u.videotext.video_cols;
692 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
693 screen_info.orig_video_lines = tag->u.videotext.video_lines;
694 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
695 screen_info.orig_video_points = tag->u.videotext.video_points;
699 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
702 static int __init parse_tag_ramdisk(const struct tag *tag)
704 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
705 (tag->u.ramdisk.flags & 2) == 0,
706 tag->u.ramdisk.start, tag->u.ramdisk.size);
710 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
712 static int __init parse_tag_serialnr(const struct tag *tag)
714 system_serial_low = tag->u.serialnr.low;
715 system_serial_high = tag->u.serialnr.high;
719 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
721 static int __init parse_tag_revision(const struct tag *tag)
723 system_rev = tag->u.revision.rev;
727 __tagtable(ATAG_REVISION, parse_tag_revision);
729 static int __init parse_tag_cmdline(const struct tag *tag)
731 #if defined(CONFIG_CMDLINE_EXTEND)
732 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
733 strlcat(default_command_line, tag->u.cmdline.cmdline,
735 #elif defined(CONFIG_CMDLINE_FORCE)
736 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
738 strlcpy(default_command_line, tag->u.cmdline.cmdline,
744 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
747 * Scan the tag table for this tag, and call its parse function.
748 * The tag table is built by the linker from all the __tagtable
751 static int __init parse_tag(const struct tag *tag)
753 extern struct tagtable __tagtable_begin, __tagtable_end;
756 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
757 if (tag->hdr.tag == t->tag) {
762 return t < &__tagtable_end;
766 * Parse all tags in the list, checking both the global and architecture
767 * specific tag tables.
769 static void __init parse_tags(const struct tag *t)
771 for (; t->hdr.size; t = tag_next(t))
774 "Ignoring unrecognised tag 0x%08x\n",
779 * This holds our defaults.
781 static struct init_tags {
782 struct tag_header hdr1;
783 struct tag_core core;
784 struct tag_header hdr2;
785 struct tag_mem32 mem;
786 struct tag_header hdr3;
787 } init_tags __initdata = {
788 { tag_size(tag_core), ATAG_CORE },
789 { 1, PAGE_SIZE, 0xff },
790 { tag_size(tag_mem32), ATAG_MEM },
795 static int __init customize_machine(void)
797 /* customizes platform devices, or adds new ones */
798 if (machine_desc->init_machine)
799 machine_desc->init_machine();
802 arch_initcall(customize_machine);
804 static int __init init_machine_late(void)
806 if (machine_desc->init_late)
807 machine_desc->init_late();
810 late_initcall(init_machine_late);
813 static inline unsigned long long get_total_mem(void)
817 total = max_low_pfn - min_low_pfn;
818 return total << PAGE_SHIFT;
822 * reserve_crashkernel() - reserves memory are for crash kernel
824 * This function reserves memory area given in "crashkernel=" kernel command
825 * line parameter. The memory reserved is used by a dump capture kernel when
826 * primary kernel is crashing.
828 static void __init reserve_crashkernel(void)
830 unsigned long long crash_size, crash_base;
831 unsigned long long total_mem;
834 total_mem = get_total_mem();
835 ret = parse_crashkernel(boot_command_line, total_mem,
836 &crash_size, &crash_base);
840 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
842 printk(KERN_WARNING "crashkernel reservation failed - "
843 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
847 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
848 "for crashkernel (System RAM: %ldMB)\n",
849 (unsigned long)(crash_size >> 20),
850 (unsigned long)(crash_base >> 20),
851 (unsigned long)(total_mem >> 20));
853 crashk_res.start = crash_base;
854 crashk_res.end = crash_base + crash_size - 1;
855 insert_resource(&iomem_resource, &crashk_res);
858 static inline void reserve_crashkernel(void) {}
859 #endif /* CONFIG_KEXEC */
861 static void __init squash_mem_tags(struct tag *tag)
863 for (; tag->hdr.size; tag = tag_next(tag))
864 if (tag->hdr.tag == ATAG_MEM)
865 tag->hdr.tag = ATAG_NONE;
868 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
870 struct tag *tags = (struct tag *)&init_tags;
871 struct machine_desc *mdesc = NULL, *p;
872 char *from = default_command_line;
874 init_tags.mem.start = PHYS_OFFSET;
877 * locate machine in the list of supported machines.
879 for_each_machine_desc(p)
881 printk("Machine: %s\n", p->name);
887 early_print("\nError: unrecognized/unsupported machine ID"
888 " (r1 = 0x%08x).\n\n", nr);
889 dump_machine_table(); /* does not return */
893 tags = phys_to_virt(__atags_pointer);
894 else if (mdesc->atag_offset)
895 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
897 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
899 * If we have the old style parameters, convert them to
902 if (tags->hdr.tag != ATAG_CORE)
903 convert_to_tag_list(tags);
906 if (tags->hdr.tag != ATAG_CORE) {
907 #if defined(CONFIG_OF)
909 * If CONFIG_OF is set, then assume this is a reasonably
910 * modern system that should pass boot parameters
912 early_print("Warning: Neither atags nor dtb found\n");
914 tags = (struct tag *)&init_tags;
918 mdesc->fixup(tags, &from, &meminfo);
920 if (tags->hdr.tag == ATAG_CORE) {
921 if (meminfo.nr_banks != 0)
922 squash_mem_tags(tags);
927 /* parse_early_param needs a boot_command_line */
928 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
933 static int __init meminfo_cmp(const void *_a, const void *_b)
935 const struct membank *a = _a, *b = _b;
936 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
937 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
940 void __init setup_arch(char **cmdline_p)
942 struct machine_desc *mdesc;
945 mdesc = setup_machine_fdt(__atags_pointer);
947 mdesc = setup_machine_tags(machine_arch_type);
948 machine_desc = mdesc;
949 machine_name = mdesc->name;
951 setup_dma_zone(mdesc);
953 if (mdesc->restart_mode)
954 reboot_setup(&mdesc->restart_mode);
956 init_mm.start_code = (unsigned long) _text;
957 init_mm.end_code = (unsigned long) _etext;
958 init_mm.end_data = (unsigned long) _edata;
959 init_mm.brk = (unsigned long) _end;
961 /* populate cmd_line too for later use, preserving boot_command_line */
962 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
963 *cmdline_p = cmd_line;
967 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
968 sanity_check_meminfo();
969 arm_memblock_init(&meminfo, mdesc);
972 request_standard_resources(mdesc);
975 arm_pm_restart = mdesc->restart;
977 unflatten_device_tree();
983 reserve_crashkernel();
987 #ifdef CONFIG_MULTI_IRQ_HANDLER
988 handle_arch_irq = mdesc->handle_irq;
992 #if defined(CONFIG_VGA_CONSOLE)
993 conswitchp = &vga_con;
994 #elif defined(CONFIG_DUMMY_CONSOLE)
995 conswitchp = &dummy_con;
999 if (mdesc->init_early)
1000 mdesc->init_early();
1004 static int __init topology_init(void)
1008 for_each_possible_cpu(cpu) {
1009 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
1010 cpuinfo->cpu.hotpluggable = 1;
1011 register_cpu(&cpuinfo->cpu, cpu);
1016 subsys_initcall(topology_init);
1018 #ifdef CONFIG_HAVE_PROC_CPU
1019 static int __init proc_cpu_init(void)
1021 struct proc_dir_entry *res;
1023 res = proc_mkdir("cpu", NULL);
1028 fs_initcall(proc_cpu_init);
1031 static const char *hwcap_str[] = {
1054 static int c_show(struct seq_file *m, void *v)
1058 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1059 cpu_name, read_cpuid_id() & 15, elf_platform);
1061 #if defined(CONFIG_SMP)
1062 for_each_online_cpu(i) {
1064 * glibc reads /proc/cpuinfo to determine the number of
1065 * online processors, looking for lines beginning with
1066 * "processor". Give glibc what it expects.
1068 seq_printf(m, "processor\t: %d\n", i);
1069 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1070 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1071 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1073 #else /* CONFIG_SMP */
1074 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1075 loops_per_jiffy / (500000/HZ),
1076 (loops_per_jiffy / (5000/HZ)) % 100);
1079 /* dump out the processor features */
1080 seq_puts(m, "Features\t: ");
1082 for (i = 0; hwcap_str[i]; i++)
1083 if (elf_hwcap & (1 << i))
1084 seq_printf(m, "%s ", hwcap_str[i]);
1086 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1087 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1089 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1091 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1093 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1095 seq_printf(m, "CPU variant\t: 0x%02x\n",
1096 (read_cpuid_id() >> 16) & 127);
1099 seq_printf(m, "CPU variant\t: 0x%x\n",
1100 (read_cpuid_id() >> 20) & 15);
1102 seq_printf(m, "CPU part\t: 0x%03x\n",
1103 (read_cpuid_id() >> 4) & 0xfff);
1105 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1109 seq_printf(m, "Hardware\t: %s\n", machine_name);
1110 seq_printf(m, "Revision\t: %04x\n", system_rev);
1111 seq_printf(m, "Serial\t\t: %08x%08x\n",
1112 system_serial_high, system_serial_low);
1117 static void *c_start(struct seq_file *m, loff_t *pos)
1119 return *pos < 1 ? (void *)1 : NULL;
1122 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1128 static void c_stop(struct seq_file *m, void *v)
1132 const struct seq_operations cpuinfo_op = {