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/crash_dump.h>
25 #include <linux/root_dev.h>
26 #include <linux/cpu.h>
27 #include <linux/interrupt.h>
28 #include <linux/smp.h>
30 #include <linux/proc_fs.h>
31 #include <linux/memblock.h>
32 #include <linux/bug.h>
33 #include <linux/compiler.h>
35 #include <asm/unified.h>
37 #include <asm/cputype.h>
39 #include <asm/procinfo.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/smp_plat.h>
43 #include <asm/mach-types.h>
44 #include <asm/cacheflush.h>
45 #include <asm/cachetype.h>
46 #include <asm/tlbflush.h>
47 #include <asm/system.h>
50 #include <asm/mach/arch.h>
51 #include <asm/mach/irq.h>
52 #include <asm/mach/time.h>
53 #include <asm/traps.h>
54 #include <asm/unwind.h>
56 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
63 #define MEM_SIZE (16*1024*1024)
66 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
69 static int __init
fpe_setup(char *line
)
71 memcpy(fpe_type
, line
, 8);
75 __setup("fpe=", fpe_setup
);
78 extern void paging_init(struct machine_desc
*desc
);
79 extern void sanity_check_meminfo(void);
80 extern void reboot_setup(char *str
);
82 unsigned int processor_id
;
83 EXPORT_SYMBOL(processor_id
);
84 unsigned int __machine_arch_type __read_mostly
;
85 EXPORT_SYMBOL(__machine_arch_type
);
86 unsigned int cacheid __read_mostly
;
87 EXPORT_SYMBOL(cacheid
);
89 unsigned int __atags_pointer __initdata
;
91 unsigned int system_rev
;
92 EXPORT_SYMBOL(system_rev
);
94 unsigned int system_serial_low
;
95 EXPORT_SYMBOL(system_serial_low
);
97 unsigned int system_serial_high
;
98 EXPORT_SYMBOL(system_serial_high
);
100 unsigned int elf_hwcap __read_mostly
;
101 EXPORT_SYMBOL(elf_hwcap
);
105 struct processor processor __read_mostly
;
108 struct cpu_tlb_fns cpu_tlb __read_mostly
;
111 struct cpu_user_fns cpu_user __read_mostly
;
114 struct cpu_cache_fns cpu_cache __read_mostly
;
116 #ifdef CONFIG_OUTER_CACHE
117 struct outer_cache_fns outer_cache __read_mostly
;
118 EXPORT_SYMBOL(outer_cache
);
122 * Cached cpu_architecture() result for use by assembler code.
123 * C code should use the cpu_architecture() function instead of accessing this
126 int __cpu_architecture __read_mostly
= CPU_ARCH_UNKNOWN
;
132 } ____cacheline_aligned
;
134 static struct stack stacks
[NR_CPUS
];
136 char elf_platform
[ELF_PLATFORM_SIZE
];
137 EXPORT_SYMBOL(elf_platform
);
139 static const char *cpu_name
;
140 static const char *machine_name
;
141 static char __initdata cmd_line
[COMMAND_LINE_SIZE
];
142 struct machine_desc
*machine_desc __initdata
;
144 static char default_command_line
[COMMAND_LINE_SIZE
] __initdata
= CONFIG_CMDLINE
;
145 static union { char c
[4]; unsigned long l
; } endian_test __initdata
= { { 'l', '?', '?', 'b' } };
146 #define ENDIANNESS ((char)endian_test.l)
148 DEFINE_PER_CPU(struct cpuinfo_arm
, cpu_data
);
151 * Standard memory resources
153 static struct resource mem_res
[] = {
158 .flags
= IORESOURCE_MEM
161 .name
= "Kernel text",
164 .flags
= IORESOURCE_MEM
167 .name
= "Kernel data",
170 .flags
= IORESOURCE_MEM
174 #define video_ram mem_res[0]
175 #define kernel_code mem_res[1]
176 #define kernel_data mem_res[2]
178 static struct resource io_res
[] = {
183 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
189 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
195 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
199 #define lp0 io_res[0]
200 #define lp1 io_res[1]
201 #define lp2 io_res[2]
203 static const char *proc_arch
[] = {
223 static int __get_cpu_architecture(void)
227 if ((read_cpuid_id() & 0x0008f000) == 0) {
228 cpu_arch
= CPU_ARCH_UNKNOWN
;
229 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
230 cpu_arch
= (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T
: CPU_ARCH_ARMv3
;
231 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
232 cpu_arch
= (read_cpuid_id() >> 16) & 7;
234 cpu_arch
+= CPU_ARCH_ARMv3
;
235 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
238 /* Revised CPUID format. Read the Memory Model Feature
239 * Register 0 and check for VMSAv7 or PMSAv7 */
240 asm("mrc p15, 0, %0, c0, c1, 4"
242 if ((mmfr0
& 0x0000000f) >= 0x00000003 ||
243 (mmfr0
& 0x000000f0) >= 0x00000030)
244 cpu_arch
= CPU_ARCH_ARMv7
;
245 else if ((mmfr0
& 0x0000000f) == 0x00000002 ||
246 (mmfr0
& 0x000000f0) == 0x00000020)
247 cpu_arch
= CPU_ARCH_ARMv6
;
249 cpu_arch
= CPU_ARCH_UNKNOWN
;
251 cpu_arch
= CPU_ARCH_UNKNOWN
;
256 int __pure
cpu_architecture(void)
258 BUG_ON(__cpu_architecture
== CPU_ARCH_UNKNOWN
);
260 return __cpu_architecture
;
263 static int cpu_has_aliasing_icache(unsigned int arch
)
266 unsigned int id_reg
, num_sets
, line_size
;
268 /* PIPT caches never alias. */
269 if (icache_is_pipt())
272 /* arch specifies the register format */
275 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
276 : /* No output operands */
279 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
281 line_size
= 4 << ((id_reg
& 0x7) + 2);
282 num_sets
= ((id_reg
>> 13) & 0x7fff) + 1;
283 aliasing_icache
= (line_size
* num_sets
) > PAGE_SIZE
;
286 aliasing_icache
= read_cpuid_cachetype() & (1 << 11);
289 /* I-cache aliases will be handled by D-cache aliasing code */
293 return aliasing_icache
;
296 static void __init
cacheid_init(void)
298 unsigned int cachetype
= read_cpuid_cachetype();
299 unsigned int arch
= cpu_architecture();
301 if (arch
>= CPU_ARCH_ARMv6
) {
302 if ((cachetype
& (7 << 29)) == 4 << 29) {
303 /* ARMv7 register format */
304 arch
= CPU_ARCH_ARMv7
;
305 cacheid
= CACHEID_VIPT_NONALIASING
;
306 switch (cachetype
& (3 << 14)) {
308 cacheid
|= CACHEID_ASID_TAGGED
;
311 cacheid
|= CACHEID_PIPT
;
315 arch
= CPU_ARCH_ARMv6
;
316 if (cachetype
& (1 << 23))
317 cacheid
= CACHEID_VIPT_ALIASING
;
319 cacheid
= CACHEID_VIPT_NONALIASING
;
321 if (cpu_has_aliasing_icache(arch
))
322 cacheid
|= CACHEID_VIPT_I_ALIASING
;
324 cacheid
= CACHEID_VIVT
;
327 printk("CPU: %s data cache, %s instruction cache\n",
328 cache_is_vivt() ? "VIVT" :
329 cache_is_vipt_aliasing() ? "VIPT aliasing" :
330 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
331 cache_is_vivt() ? "VIVT" :
332 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
333 icache_is_vipt_aliasing() ? "VIPT aliasing" :
334 icache_is_pipt() ? "PIPT" :
335 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
339 * These functions re-use the assembly code in head.S, which
340 * already provide the required functionality.
342 extern struct proc_info_list
*lookup_processor_type(unsigned int);
344 void __init
early_print(const char *str
, ...)
346 extern void printascii(const char *);
351 vsnprintf(buf
, sizeof(buf
), str
, ap
);
354 #ifdef CONFIG_DEBUG_LL
360 static void __init
feat_v6_fixup(void)
362 int id
= read_cpuid_id();
364 if ((id
& 0xff0f0000) != 0x41070000)
368 * HWCAP_TLS is available only on 1136 r1p0 and later,
369 * see also kuser_get_tls_init.
371 if ((((id
>> 4) & 0xfff) == 0xb36) && (((id
>> 20) & 3) == 0))
372 elf_hwcap
&= ~HWCAP_TLS
;
376 * cpu_init - initialise one CPU.
378 * cpu_init sets up the per-CPU stacks.
382 unsigned int cpu
= smp_processor_id();
383 struct stack
*stk
= &stacks
[cpu
];
385 if (cpu
>= NR_CPUS
) {
386 printk(KERN_CRIT
"CPU%u: bad primary CPU number\n", cpu
);
393 * Define the placement constraint for the inline asm directive below.
394 * In Thumb-2, msr with an immediate value is not allowed.
396 #ifdef CONFIG_THUMB2_KERNEL
403 * setup stacks for re-entrant exception handlers
407 "add r14, %0, %2\n\t"
410 "add r14, %0, %4\n\t"
413 "add r14, %0, %6\n\t"
418 PLC (PSR_F_BIT
| PSR_I_BIT
| IRQ_MODE
),
419 "I" (offsetof(struct stack
, irq
[0])),
420 PLC (PSR_F_BIT
| PSR_I_BIT
| ABT_MODE
),
421 "I" (offsetof(struct stack
, abt
[0])),
422 PLC (PSR_F_BIT
| PSR_I_BIT
| UND_MODE
),
423 "I" (offsetof(struct stack
, und
[0])),
424 PLC (PSR_F_BIT
| PSR_I_BIT
| SVC_MODE
)
428 static void __init
setup_processor(void)
430 struct proc_info_list
*list
;
433 * locate processor in the list of supported processor
434 * types. The linker builds this table for us from the
435 * entries in arch/arm/mm/proc-*.S
437 list
= lookup_processor_type(read_cpuid_id());
439 printk("CPU configuration botched (ID %08x), unable "
440 "to continue.\n", read_cpuid_id());
444 cpu_name
= list
->cpu_name
;
445 __cpu_architecture
= __get_cpu_architecture();
448 processor
= *list
->proc
;
451 cpu_tlb
= *list
->tlb
;
454 cpu_user
= *list
->user
;
457 cpu_cache
= *list
->cache
;
460 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
461 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15,
462 proc_arch
[cpu_architecture()], cr_alignment
);
464 snprintf(init_utsname()->machine
, __NEW_UTS_LEN
+ 1, "%s%c",
465 list
->arch_name
, ENDIANNESS
);
466 snprintf(elf_platform
, ELF_PLATFORM_SIZE
, "%s%c",
467 list
->elf_name
, ENDIANNESS
);
468 elf_hwcap
= list
->elf_hwcap
;
469 #ifndef CONFIG_ARM_THUMB
470 elf_hwcap
&= ~HWCAP_THUMB
;
479 void __init
dump_machine_table(void)
481 struct machine_desc
*p
;
483 early_print("Available machine support:\n\nID (hex)\tNAME\n");
484 for_each_machine_desc(p
)
485 early_print("%08x\t%s\n", p
->nr
, p
->name
);
487 early_print("\nPlease check your kernel config and/or bootloader.\n");
490 /* can't use cpu_relax() here as it may require MMU setup */;
493 int __init
arm_add_memory(phys_addr_t start
, unsigned long size
)
495 struct membank
*bank
= &meminfo
.bank
[meminfo
.nr_banks
];
497 if (meminfo
.nr_banks
>= NR_BANKS
) {
498 printk(KERN_CRIT
"NR_BANKS too low, "
499 "ignoring memory at 0x%08llx\n", (long long)start
);
504 * Ensure that start/size are aligned to a page boundary.
505 * Size is appropriately rounded down, start is rounded up.
507 size
-= start
& ~PAGE_MASK
;
508 bank
->start
= PAGE_ALIGN(start
);
509 bank
->size
= size
& PAGE_MASK
;
512 * Check whether this memory region has non-zero size or
513 * invalid node number.
523 * Pick out the memory size. We look for mem=size@start,
524 * where start and size are "size[KkMm]"
526 static int __init
early_mem(char *p
)
528 static int usermem __initdata
= 0;
534 * If the user specifies memory size, we
535 * blow away any automatically generated
540 meminfo
.nr_banks
= 0;
544 size
= memparse(p
, &endp
);
546 start
= memparse(endp
+ 1, NULL
);
548 arm_add_memory(start
, size
);
552 early_param("mem", early_mem
);
555 setup_ramdisk(int doload
, int prompt
, int image_start
, unsigned int rd_sz
)
557 #ifdef CONFIG_BLK_DEV_RAM
558 extern int rd_size
, rd_image_start
, rd_prompt
, rd_doload
;
560 rd_image_start
= image_start
;
569 static void __init
request_standard_resources(struct machine_desc
*mdesc
)
571 struct memblock_region
*region
;
572 struct resource
*res
;
574 kernel_code
.start
= virt_to_phys(_text
);
575 kernel_code
.end
= virt_to_phys(_etext
- 1);
576 kernel_data
.start
= virt_to_phys(_sdata
);
577 kernel_data
.end
= virt_to_phys(_end
- 1);
579 for_each_memblock(memory
, region
) {
580 res
= alloc_bootmem_low(sizeof(*res
));
581 res
->name
= "System RAM";
582 res
->start
= __pfn_to_phys(memblock_region_memory_base_pfn(region
));
583 res
->end
= __pfn_to_phys(memblock_region_memory_end_pfn(region
)) - 1;
584 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
586 request_resource(&iomem_resource
, res
);
588 if (kernel_code
.start
>= res
->start
&&
589 kernel_code
.end
<= res
->end
)
590 request_resource(res
, &kernel_code
);
591 if (kernel_data
.start
>= res
->start
&&
592 kernel_data
.end
<= res
->end
)
593 request_resource(res
, &kernel_data
);
596 if (mdesc
->video_start
) {
597 video_ram
.start
= mdesc
->video_start
;
598 video_ram
.end
= mdesc
->video_end
;
599 request_resource(&iomem_resource
, &video_ram
);
603 * Some machines don't have the possibility of ever
604 * possessing lp0, lp1 or lp2
606 if (mdesc
->reserve_lp0
)
607 request_resource(&ioport_resource
, &lp0
);
608 if (mdesc
->reserve_lp1
)
609 request_resource(&ioport_resource
, &lp1
);
610 if (mdesc
->reserve_lp2
)
611 request_resource(&ioport_resource
, &lp2
);
617 * This is the new way of passing data to the kernel at boot time. Rather
618 * than passing a fixed inflexible structure to the kernel, we pass a list
619 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
620 * tag for the list to be recognised (to distinguish the tagged list from
621 * a param_struct). The list is terminated with a zero-length tag (this tag
622 * is not parsed in any way).
624 static int __init
parse_tag_core(const struct tag
*tag
)
626 if (tag
->hdr
.size
> 2) {
627 if ((tag
->u
.core
.flags
& 1) == 0)
628 root_mountflags
&= ~MS_RDONLY
;
629 ROOT_DEV
= old_decode_dev(tag
->u
.core
.rootdev
);
634 __tagtable(ATAG_CORE
, parse_tag_core
);
636 static int __init
parse_tag_mem32(const struct tag
*tag
)
638 return arm_add_memory(tag
->u
.mem
.start
, tag
->u
.mem
.size
);
641 __tagtable(ATAG_MEM
, parse_tag_mem32
);
643 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
644 struct screen_info screen_info
= {
645 .orig_video_lines
= 30,
646 .orig_video_cols
= 80,
647 .orig_video_mode
= 0,
648 .orig_video_ega_bx
= 0,
649 .orig_video_isVGA
= 1,
650 .orig_video_points
= 8
653 static int __init
parse_tag_videotext(const struct tag
*tag
)
655 screen_info
.orig_x
= tag
->u
.videotext
.x
;
656 screen_info
.orig_y
= tag
->u
.videotext
.y
;
657 screen_info
.orig_video_page
= tag
->u
.videotext
.video_page
;
658 screen_info
.orig_video_mode
= tag
->u
.videotext
.video_mode
;
659 screen_info
.orig_video_cols
= tag
->u
.videotext
.video_cols
;
660 screen_info
.orig_video_ega_bx
= tag
->u
.videotext
.video_ega_bx
;
661 screen_info
.orig_video_lines
= tag
->u
.videotext
.video_lines
;
662 screen_info
.orig_video_isVGA
= tag
->u
.videotext
.video_isvga
;
663 screen_info
.orig_video_points
= tag
->u
.videotext
.video_points
;
667 __tagtable(ATAG_VIDEOTEXT
, parse_tag_videotext
);
670 static int __init
parse_tag_ramdisk(const struct tag
*tag
)
672 setup_ramdisk((tag
->u
.ramdisk
.flags
& 1) == 0,
673 (tag
->u
.ramdisk
.flags
& 2) == 0,
674 tag
->u
.ramdisk
.start
, tag
->u
.ramdisk
.size
);
678 __tagtable(ATAG_RAMDISK
, parse_tag_ramdisk
);
680 static int __init
parse_tag_serialnr(const struct tag
*tag
)
682 system_serial_low
= tag
->u
.serialnr
.low
;
683 system_serial_high
= tag
->u
.serialnr
.high
;
687 __tagtable(ATAG_SERIAL
, parse_tag_serialnr
);
689 static int __init
parse_tag_revision(const struct tag
*tag
)
691 system_rev
= tag
->u
.revision
.rev
;
695 __tagtable(ATAG_REVISION
, parse_tag_revision
);
697 static int __init
parse_tag_cmdline(const struct tag
*tag
)
699 #if defined(CONFIG_CMDLINE_EXTEND)
700 strlcat(default_command_line
, " ", COMMAND_LINE_SIZE
);
701 strlcat(default_command_line
, tag
->u
.cmdline
.cmdline
,
703 #elif defined(CONFIG_CMDLINE_FORCE)
704 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
706 strlcpy(default_command_line
, tag
->u
.cmdline
.cmdline
,
712 __tagtable(ATAG_CMDLINE
, parse_tag_cmdline
);
715 * Scan the tag table for this tag, and call its parse function.
716 * The tag table is built by the linker from all the __tagtable
719 static int __init
parse_tag(const struct tag
*tag
)
721 extern struct tagtable __tagtable_begin
, __tagtable_end
;
724 for (t
= &__tagtable_begin
; t
< &__tagtable_end
; t
++)
725 if (tag
->hdr
.tag
== t
->tag
) {
730 return t
< &__tagtable_end
;
734 * Parse all tags in the list, checking both the global and architecture
735 * specific tag tables.
737 static void __init
parse_tags(const struct tag
*t
)
739 for (; t
->hdr
.size
; t
= tag_next(t
))
742 "Ignoring unrecognised tag 0x%08x\n",
747 * This holds our defaults.
749 static struct init_tags
{
750 struct tag_header hdr1
;
751 struct tag_core core
;
752 struct tag_header hdr2
;
753 struct tag_mem32 mem
;
754 struct tag_header hdr3
;
755 } init_tags __initdata
= {
756 { tag_size(tag_core
), ATAG_CORE
},
757 { 1, PAGE_SIZE
, 0xff },
758 { tag_size(tag_mem32
), ATAG_MEM
},
763 static int __init
customize_machine(void)
765 /* customizes platform devices, or adds new ones */
766 if (machine_desc
->init_machine
)
767 machine_desc
->init_machine();
770 arch_initcall(customize_machine
);
773 static inline unsigned long long get_total_mem(void)
777 total
= max_low_pfn
- min_low_pfn
;
778 return total
<< PAGE_SHIFT
;
782 * reserve_crashkernel() - reserves memory are for crash kernel
784 * This function reserves memory area given in "crashkernel=" kernel command
785 * line parameter. The memory reserved is used by a dump capture kernel when
786 * primary kernel is crashing.
788 static void __init
reserve_crashkernel(void)
790 unsigned long long crash_size
, crash_base
;
791 unsigned long long total_mem
;
794 total_mem
= get_total_mem();
795 ret
= parse_crashkernel(boot_command_line
, total_mem
,
796 &crash_size
, &crash_base
);
800 ret
= reserve_bootmem(crash_base
, crash_size
, BOOTMEM_EXCLUSIVE
);
802 printk(KERN_WARNING
"crashkernel reservation failed - "
803 "memory is in use (0x%lx)\n", (unsigned long)crash_base
);
807 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
808 "for crashkernel (System RAM: %ldMB)\n",
809 (unsigned long)(crash_size
>> 20),
810 (unsigned long)(crash_base
>> 20),
811 (unsigned long)(total_mem
>> 20));
813 crashk_res
.start
= crash_base
;
814 crashk_res
.end
= crash_base
+ crash_size
- 1;
815 insert_resource(&iomem_resource
, &crashk_res
);
818 static inline void reserve_crashkernel(void) {}
819 #endif /* CONFIG_KEXEC */
821 static void __init
squash_mem_tags(struct tag
*tag
)
823 for (; tag
->hdr
.size
; tag
= tag_next(tag
))
824 if (tag
->hdr
.tag
== ATAG_MEM
)
825 tag
->hdr
.tag
= ATAG_NONE
;
828 static struct machine_desc
* __init
setup_machine_tags(unsigned int nr
)
830 struct tag
*tags
= (struct tag
*)&init_tags
;
831 struct machine_desc
*mdesc
= NULL
, *p
;
832 char *from
= default_command_line
;
834 init_tags
.mem
.start
= PHYS_OFFSET
;
837 * locate machine in the list of supported machines.
839 for_each_machine_desc(p
)
841 printk("Machine: %s\n", p
->name
);
847 early_print("\nError: unrecognized/unsupported machine ID"
848 " (r1 = 0x%08x).\n\n", nr
);
849 dump_machine_table(); /* does not return */
853 tags
= phys_to_virt(__atags_pointer
);
854 else if (mdesc
->atag_offset
)
855 tags
= (void *)(PAGE_OFFSET
+ mdesc
->atag_offset
);
857 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
859 * If we have the old style parameters, convert them to
862 if (tags
->hdr
.tag
!= ATAG_CORE
)
863 convert_to_tag_list(tags
);
866 if (tags
->hdr
.tag
!= ATAG_CORE
) {
867 #if defined(CONFIG_OF)
869 * If CONFIG_OF is set, then assume this is a reasonably
870 * modern system that should pass boot parameters
872 early_print("Warning: Neither atags nor dtb found\n");
874 tags
= (struct tag
*)&init_tags
;
878 mdesc
->fixup(tags
, &from
, &meminfo
);
880 if (tags
->hdr
.tag
== ATAG_CORE
) {
881 if (meminfo
.nr_banks
!= 0)
882 squash_mem_tags(tags
);
887 /* parse_early_param needs a boot_command_line */
888 strlcpy(boot_command_line
, from
, COMMAND_LINE_SIZE
);
894 void __init
setup_arch(char **cmdline_p
)
896 struct machine_desc
*mdesc
;
901 mdesc
= setup_machine_fdt(__atags_pointer
);
903 mdesc
= setup_machine_tags(machine_arch_type
);
904 machine_desc
= mdesc
;
905 machine_name
= mdesc
->name
;
907 if (mdesc
->soft_reboot
)
910 init_mm
.start_code
= (unsigned long) _text
;
911 init_mm
.end_code
= (unsigned long) _etext
;
912 init_mm
.end_data
= (unsigned long) _edata
;
913 init_mm
.brk
= (unsigned long) _end
;
915 /* populate cmd_line too for later use, preserving boot_command_line */
916 strlcpy(cmd_line
, boot_command_line
, COMMAND_LINE_SIZE
);
917 *cmdline_p
= cmd_line
;
921 sanity_check_meminfo();
922 arm_memblock_init(&meminfo
, mdesc
);
925 request_standard_resources(mdesc
);
927 unflatten_device_tree();
933 reserve_crashkernel();
937 #ifdef CONFIG_ZONE_DMA
938 if (mdesc
->dma_zone_size
) {
939 extern unsigned long arm_dma_zone_size
;
940 arm_dma_zone_size
= mdesc
->dma_zone_size
;
943 #ifdef CONFIG_MULTI_IRQ_HANDLER
944 handle_arch_irq
= mdesc
->handle_irq
;
948 #if defined(CONFIG_VGA_CONSOLE)
949 conswitchp
= &vga_con
;
950 #elif defined(CONFIG_DUMMY_CONSOLE)
951 conswitchp
= &dummy_con
;
956 if (mdesc
->init_early
)
961 static int __init
topology_init(void)
965 for_each_possible_cpu(cpu
) {
966 struct cpuinfo_arm
*cpuinfo
= &per_cpu(cpu_data
, cpu
);
967 cpuinfo
->cpu
.hotpluggable
= 1;
968 register_cpu(&cpuinfo
->cpu
, cpu
);
973 subsys_initcall(topology_init
);
975 #ifdef CONFIG_HAVE_PROC_CPU
976 static int __init
proc_cpu_init(void)
978 struct proc_dir_entry
*res
;
980 res
= proc_mkdir("cpu", NULL
);
985 fs_initcall(proc_cpu_init
);
988 static const char *hwcap_str
[] = {
1011 static int c_show(struct seq_file
*m
, void *v
)
1015 seq_printf(m
, "Processor\t: %s rev %d (%s)\n",
1016 cpu_name
, read_cpuid_id() & 15, elf_platform
);
1018 #if defined(CONFIG_SMP)
1019 for_each_online_cpu(i
) {
1021 * glibc reads /proc/cpuinfo to determine the number of
1022 * online processors, looking for lines beginning with
1023 * "processor". Give glibc what it expects.
1025 seq_printf(m
, "processor\t: %d\n", i
);
1026 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n\n",
1027 per_cpu(cpu_data
, i
).loops_per_jiffy
/ (500000UL/HZ
),
1028 (per_cpu(cpu_data
, i
).loops_per_jiffy
/ (5000UL/HZ
)) % 100);
1030 #else /* CONFIG_SMP */
1031 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n",
1032 loops_per_jiffy
/ (500000/HZ
),
1033 (loops_per_jiffy
/ (5000/HZ
)) % 100);
1036 /* dump out the processor features */
1037 seq_puts(m
, "Features\t: ");
1039 for (i
= 0; hwcap_str
[i
]; i
++)
1040 if (elf_hwcap
& (1 << i
))
1041 seq_printf(m
, "%s ", hwcap_str
[i
]);
1043 seq_printf(m
, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1044 seq_printf(m
, "CPU architecture: %s\n", proc_arch
[cpu_architecture()]);
1046 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1048 seq_printf(m
, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1050 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1052 seq_printf(m
, "CPU variant\t: 0x%02x\n",
1053 (read_cpuid_id() >> 16) & 127);
1056 seq_printf(m
, "CPU variant\t: 0x%x\n",
1057 (read_cpuid_id() >> 20) & 15);
1059 seq_printf(m
, "CPU part\t: 0x%03x\n",
1060 (read_cpuid_id() >> 4) & 0xfff);
1062 seq_printf(m
, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1066 seq_printf(m
, "Hardware\t: %s\n", machine_name
);
1067 seq_printf(m
, "Revision\t: %04x\n", system_rev
);
1068 seq_printf(m
, "Serial\t\t: %08x%08x\n",
1069 system_serial_high
, system_serial_low
);
1074 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
1076 return *pos
< 1 ? (void *)1 : NULL
;
1079 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1085 static void c_stop(struct seq_file
*m
, void *v
)
1089 const struct seq_operations cpuinfo_op
= {