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
, phys_addr_t 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
& ~(phys_addr_t
)(PAGE_SIZE
- 1);
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
= {