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
);
85 unsigned int processor_id
;
86 EXPORT_SYMBOL(processor_id
);
87 unsigned int __machine_arch_type __read_mostly
;
88 EXPORT_SYMBOL(__machine_arch_type
);
89 unsigned int cacheid __read_mostly
;
90 EXPORT_SYMBOL(cacheid
);
92 unsigned int __atags_pointer __initdata
;
94 unsigned int system_rev
;
95 EXPORT_SYMBOL(system_rev
);
97 unsigned int system_serial_low
;
98 EXPORT_SYMBOL(system_serial_low
);
100 unsigned int system_serial_high
;
101 EXPORT_SYMBOL(system_serial_high
);
103 unsigned int elf_hwcap __read_mostly
;
104 EXPORT_SYMBOL(elf_hwcap
);
108 struct processor processor __read_mostly
;
111 struct cpu_tlb_fns cpu_tlb __read_mostly
;
114 struct cpu_user_fns cpu_user __read_mostly
;
117 struct cpu_cache_fns cpu_cache __read_mostly
;
119 #ifdef CONFIG_OUTER_CACHE
120 struct outer_cache_fns outer_cache __read_mostly
;
121 EXPORT_SYMBOL(outer_cache
);
125 * Cached cpu_architecture() result for use by assembler code.
126 * C code should use the cpu_architecture() function instead of accessing this
129 int __cpu_architecture __read_mostly
= CPU_ARCH_UNKNOWN
;
135 } ____cacheline_aligned
;
137 static struct stack stacks
[NR_CPUS
];
139 char elf_platform
[ELF_PLATFORM_SIZE
];
140 EXPORT_SYMBOL(elf_platform
);
142 static const char *cpu_name
;
143 static const char *machine_name
;
144 static char __initdata cmd_line
[COMMAND_LINE_SIZE
];
145 struct machine_desc
*machine_desc __initdata
;
147 static char default_command_line
[COMMAND_LINE_SIZE
] __initdata
= CONFIG_CMDLINE
;
148 static union { char c
[4]; unsigned long l
; } endian_test __initdata
= { { 'l', '?', '?', 'b' } };
149 #define ENDIANNESS ((char)endian_test.l)
151 DEFINE_PER_CPU(struct cpuinfo_arm
, cpu_data
);
154 * Standard memory resources
156 static struct resource mem_res
[] = {
161 .flags
= IORESOURCE_MEM
164 .name
= "Kernel code",
167 .flags
= IORESOURCE_MEM
170 .name
= "Kernel data",
173 .flags
= IORESOURCE_MEM
177 #define video_ram mem_res[0]
178 #define kernel_code mem_res[1]
179 #define kernel_data mem_res[2]
181 static struct resource io_res
[] = {
186 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
192 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
198 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
202 #define lp0 io_res[0]
203 #define lp1 io_res[1]
204 #define lp2 io_res[2]
206 static const char *proc_arch
[] = {
226 static int __get_cpu_architecture(void)
230 if ((read_cpuid_id() & 0x0008f000) == 0) {
231 cpu_arch
= CPU_ARCH_UNKNOWN
;
232 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
233 cpu_arch
= (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T
: CPU_ARCH_ARMv3
;
234 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
235 cpu_arch
= (read_cpuid_id() >> 16) & 7;
237 cpu_arch
+= CPU_ARCH_ARMv3
;
238 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
241 /* Revised CPUID format. Read the Memory Model Feature
242 * Register 0 and check for VMSAv7 or PMSAv7 */
243 asm("mrc p15, 0, %0, c0, c1, 4"
245 if ((mmfr0
& 0x0000000f) >= 0x00000003 ||
246 (mmfr0
& 0x000000f0) >= 0x00000030)
247 cpu_arch
= CPU_ARCH_ARMv7
;
248 else if ((mmfr0
& 0x0000000f) == 0x00000002 ||
249 (mmfr0
& 0x000000f0) == 0x00000020)
250 cpu_arch
= CPU_ARCH_ARMv6
;
252 cpu_arch
= CPU_ARCH_UNKNOWN
;
254 cpu_arch
= CPU_ARCH_UNKNOWN
;
259 int __pure
cpu_architecture(void)
261 BUG_ON(__cpu_architecture
== CPU_ARCH_UNKNOWN
);
263 return __cpu_architecture
;
266 static int cpu_has_aliasing_icache(unsigned int arch
)
269 unsigned int id_reg
, num_sets
, line_size
;
271 /* PIPT caches never alias. */
272 if (icache_is_pipt())
275 /* arch specifies the register format */
278 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
279 : /* No output operands */
282 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
284 line_size
= 4 << ((id_reg
& 0x7) + 2);
285 num_sets
= ((id_reg
>> 13) & 0x7fff) + 1;
286 aliasing_icache
= (line_size
* num_sets
) > PAGE_SIZE
;
289 aliasing_icache
= read_cpuid_cachetype() & (1 << 11);
292 /* I-cache aliases will be handled by D-cache aliasing code */
296 return aliasing_icache
;
299 static void __init
cacheid_init(void)
301 unsigned int cachetype
= read_cpuid_cachetype();
302 unsigned int arch
= cpu_architecture();
304 if (arch
>= CPU_ARCH_ARMv6
) {
305 if ((cachetype
& (7 << 29)) == 4 << 29) {
306 /* ARMv7 register format */
307 arch
= CPU_ARCH_ARMv7
;
308 cacheid
= CACHEID_VIPT_NONALIASING
;
309 switch (cachetype
& (3 << 14)) {
311 cacheid
|= CACHEID_ASID_TAGGED
;
314 cacheid
|= CACHEID_PIPT
;
318 arch
= CPU_ARCH_ARMv6
;
319 if (cachetype
& (1 << 23))
320 cacheid
= CACHEID_VIPT_ALIASING
;
322 cacheid
= CACHEID_VIPT_NONALIASING
;
324 if (cpu_has_aliasing_icache(arch
))
325 cacheid
|= CACHEID_VIPT_I_ALIASING
;
327 cacheid
= CACHEID_VIVT
;
330 printk("CPU: %s data cache, %s instruction cache\n",
331 cache_is_vivt() ? "VIVT" :
332 cache_is_vipt_aliasing() ? "VIPT aliasing" :
333 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
334 cache_is_vivt() ? "VIVT" :
335 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
336 icache_is_vipt_aliasing() ? "VIPT aliasing" :
337 icache_is_pipt() ? "PIPT" :
338 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
342 * These functions re-use the assembly code in head.S, which
343 * already provide the required functionality.
345 extern struct proc_info_list
*lookup_processor_type(unsigned int);
347 void __init
early_print(const char *str
, ...)
349 extern void printascii(const char *);
354 vsnprintf(buf
, sizeof(buf
), str
, ap
);
357 #ifdef CONFIG_DEBUG_LL
363 static void __init
feat_v6_fixup(void)
365 int id
= read_cpuid_id();
367 if ((id
& 0xff0f0000) != 0x41070000)
371 * HWCAP_TLS is available only on 1136 r1p0 and later,
372 * see also kuser_get_tls_init.
374 if ((((id
>> 4) & 0xfff) == 0xb36) && (((id
>> 20) & 3) == 0))
375 elf_hwcap
&= ~HWCAP_TLS
;
379 * cpu_init - initialise one CPU.
381 * cpu_init sets up the per-CPU stacks.
385 unsigned int cpu
= smp_processor_id();
386 struct stack
*stk
= &stacks
[cpu
];
388 if (cpu
>= NR_CPUS
) {
389 printk(KERN_CRIT
"CPU%u: bad primary CPU number\n", cpu
);
396 * Define the placement constraint for the inline asm directive below.
397 * In Thumb-2, msr with an immediate value is not allowed.
399 #ifdef CONFIG_THUMB2_KERNEL
406 * setup stacks for re-entrant exception handlers
410 "add r14, %0, %2\n\t"
413 "add r14, %0, %4\n\t"
416 "add r14, %0, %6\n\t"
421 PLC (PSR_F_BIT
| PSR_I_BIT
| IRQ_MODE
),
422 "I" (offsetof(struct stack
, irq
[0])),
423 PLC (PSR_F_BIT
| PSR_I_BIT
| ABT_MODE
),
424 "I" (offsetof(struct stack
, abt
[0])),
425 PLC (PSR_F_BIT
| PSR_I_BIT
| UND_MODE
),
426 "I" (offsetof(struct stack
, und
[0])),
427 PLC (PSR_F_BIT
| PSR_I_BIT
| SVC_MODE
)
431 int __cpu_logical_map
[NR_CPUS
];
433 void __init
smp_setup_processor_id(void)
436 u32 cpu
= is_smp() ? read_cpuid_mpidr() & 0xff : 0;
438 cpu_logical_map(0) = cpu
;
439 for (i
= 1; i
< NR_CPUS
; ++i
)
440 cpu_logical_map(i
) = i
== cpu
? 0 : i
;
442 printk(KERN_INFO
"Booting Linux on physical CPU %d\n", cpu
);
445 static void __init
setup_processor(void)
447 struct proc_info_list
*list
;
450 * locate processor in the list of supported processor
451 * types. The linker builds this table for us from the
452 * entries in arch/arm/mm/proc-*.S
454 list
= lookup_processor_type(read_cpuid_id());
456 printk("CPU configuration botched (ID %08x), unable "
457 "to continue.\n", read_cpuid_id());
461 cpu_name
= list
->cpu_name
;
462 __cpu_architecture
= __get_cpu_architecture();
465 processor
= *list
->proc
;
468 cpu_tlb
= *list
->tlb
;
471 cpu_user
= *list
->user
;
474 cpu_cache
= *list
->cache
;
477 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
478 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15,
479 proc_arch
[cpu_architecture()], cr_alignment
);
481 snprintf(init_utsname()->machine
, __NEW_UTS_LEN
+ 1, "%s%c",
482 list
->arch_name
, ENDIANNESS
);
483 snprintf(elf_platform
, ELF_PLATFORM_SIZE
, "%s%c",
484 list
->elf_name
, ENDIANNESS
);
485 elf_hwcap
= list
->elf_hwcap
;
486 #ifndef CONFIG_ARM_THUMB
487 elf_hwcap
&= ~HWCAP_THUMB
;
496 void __init
dump_machine_table(void)
498 struct machine_desc
*p
;
500 early_print("Available machine support:\n\nID (hex)\tNAME\n");
501 for_each_machine_desc(p
)
502 early_print("%08x\t%s\n", p
->nr
, p
->name
);
504 early_print("\nPlease check your kernel config and/or bootloader.\n");
507 /* can't use cpu_relax() here as it may require MMU setup */;
510 int __init
arm_add_memory(phys_addr_t start
, unsigned long size
)
512 struct membank
*bank
= &meminfo
.bank
[meminfo
.nr_banks
];
514 if (meminfo
.nr_banks
>= NR_BANKS
) {
515 printk(KERN_CRIT
"NR_BANKS too low, "
516 "ignoring memory at 0x%08llx\n", (long long)start
);
521 * Ensure that start/size are aligned to a page boundary.
522 * Size is appropriately rounded down, start is rounded up.
524 size
-= start
& ~PAGE_MASK
;
525 bank
->start
= PAGE_ALIGN(start
);
526 bank
->size
= size
& PAGE_MASK
;
529 * Check whether this memory region has non-zero size or
530 * invalid node number.
540 * Pick out the memory size. We look for mem=size@start,
541 * where start and size are "size[KkMm]"
543 static int __init
early_mem(char *p
)
545 static int usermem __initdata
= 0;
551 * If the user specifies memory size, we
552 * blow away any automatically generated
557 meminfo
.nr_banks
= 0;
561 size
= memparse(p
, &endp
);
563 start
= memparse(endp
+ 1, NULL
);
565 arm_add_memory(start
, size
);
569 early_param("mem", early_mem
);
572 setup_ramdisk(int doload
, int prompt
, int image_start
, unsigned int rd_sz
)
574 #ifdef CONFIG_BLK_DEV_RAM
575 extern int rd_size
, rd_image_start
, rd_prompt
, rd_doload
;
577 rd_image_start
= image_start
;
586 static void __init
request_standard_resources(struct machine_desc
*mdesc
)
588 struct memblock_region
*region
;
589 struct resource
*res
;
591 kernel_code
.start
= virt_to_phys(_text
);
592 kernel_code
.end
= virt_to_phys(_etext
- 1);
593 kernel_data
.start
= virt_to_phys(_sdata
);
594 kernel_data
.end
= virt_to_phys(_end
- 1);
596 for_each_memblock(memory
, region
) {
597 res
= alloc_bootmem_low(sizeof(*res
));
598 res
->name
= "System RAM";
599 res
->start
= __pfn_to_phys(memblock_region_memory_base_pfn(region
));
600 res
->end
= __pfn_to_phys(memblock_region_memory_end_pfn(region
)) - 1;
601 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
603 request_resource(&iomem_resource
, res
);
605 if (kernel_code
.start
>= res
->start
&&
606 kernel_code
.end
<= res
->end
)
607 request_resource(res
, &kernel_code
);
608 if (kernel_data
.start
>= res
->start
&&
609 kernel_data
.end
<= res
->end
)
610 request_resource(res
, &kernel_data
);
613 if (mdesc
->video_start
) {
614 video_ram
.start
= mdesc
->video_start
;
615 video_ram
.end
= mdesc
->video_end
;
616 request_resource(&iomem_resource
, &video_ram
);
620 * Some machines don't have the possibility of ever
621 * possessing lp0, lp1 or lp2
623 if (mdesc
->reserve_lp0
)
624 request_resource(&ioport_resource
, &lp0
);
625 if (mdesc
->reserve_lp1
)
626 request_resource(&ioport_resource
, &lp1
);
627 if (mdesc
->reserve_lp2
)
628 request_resource(&ioport_resource
, &lp2
);
634 * This is the new way of passing data to the kernel at boot time. Rather
635 * than passing a fixed inflexible structure to the kernel, we pass a list
636 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
637 * tag for the list to be recognised (to distinguish the tagged list from
638 * a param_struct). The list is terminated with a zero-length tag (this tag
639 * is not parsed in any way).
641 static int __init
parse_tag_core(const struct tag
*tag
)
643 if (tag
->hdr
.size
> 2) {
644 if ((tag
->u
.core
.flags
& 1) == 0)
645 root_mountflags
&= ~MS_RDONLY
;
646 ROOT_DEV
= old_decode_dev(tag
->u
.core
.rootdev
);
651 __tagtable(ATAG_CORE
, parse_tag_core
);
653 static int __init
parse_tag_mem32(const struct tag
*tag
)
655 return arm_add_memory(tag
->u
.mem
.start
, tag
->u
.mem
.size
);
658 __tagtable(ATAG_MEM
, parse_tag_mem32
);
660 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
661 struct screen_info screen_info
= {
662 .orig_video_lines
= 30,
663 .orig_video_cols
= 80,
664 .orig_video_mode
= 0,
665 .orig_video_ega_bx
= 0,
666 .orig_video_isVGA
= 1,
667 .orig_video_points
= 8
670 static int __init
parse_tag_videotext(const struct tag
*tag
)
672 screen_info
.orig_x
= tag
->u
.videotext
.x
;
673 screen_info
.orig_y
= tag
->u
.videotext
.y
;
674 screen_info
.orig_video_page
= tag
->u
.videotext
.video_page
;
675 screen_info
.orig_video_mode
= tag
->u
.videotext
.video_mode
;
676 screen_info
.orig_video_cols
= tag
->u
.videotext
.video_cols
;
677 screen_info
.orig_video_ega_bx
= tag
->u
.videotext
.video_ega_bx
;
678 screen_info
.orig_video_lines
= tag
->u
.videotext
.video_lines
;
679 screen_info
.orig_video_isVGA
= tag
->u
.videotext
.video_isvga
;
680 screen_info
.orig_video_points
= tag
->u
.videotext
.video_points
;
684 __tagtable(ATAG_VIDEOTEXT
, parse_tag_videotext
);
687 static int __init
parse_tag_ramdisk(const struct tag
*tag
)
689 setup_ramdisk((tag
->u
.ramdisk
.flags
& 1) == 0,
690 (tag
->u
.ramdisk
.flags
& 2) == 0,
691 tag
->u
.ramdisk
.start
, tag
->u
.ramdisk
.size
);
695 __tagtable(ATAG_RAMDISK
, parse_tag_ramdisk
);
697 static int __init
parse_tag_serialnr(const struct tag
*tag
)
699 system_serial_low
= tag
->u
.serialnr
.low
;
700 system_serial_high
= tag
->u
.serialnr
.high
;
704 __tagtable(ATAG_SERIAL
, parse_tag_serialnr
);
706 static int __init
parse_tag_revision(const struct tag
*tag
)
708 system_rev
= tag
->u
.revision
.rev
;
712 __tagtable(ATAG_REVISION
, parse_tag_revision
);
714 static int __init
parse_tag_cmdline(const struct tag
*tag
)
716 #if defined(CONFIG_CMDLINE_EXTEND)
717 strlcat(default_command_line
, " ", COMMAND_LINE_SIZE
);
718 strlcat(default_command_line
, tag
->u
.cmdline
.cmdline
,
720 #elif defined(CONFIG_CMDLINE_FORCE)
721 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
723 strlcpy(default_command_line
, tag
->u
.cmdline
.cmdline
,
729 __tagtable(ATAG_CMDLINE
, parse_tag_cmdline
);
732 * Scan the tag table for this tag, and call its parse function.
733 * The tag table is built by the linker from all the __tagtable
736 static int __init
parse_tag(const struct tag
*tag
)
738 extern struct tagtable __tagtable_begin
, __tagtable_end
;
741 for (t
= &__tagtable_begin
; t
< &__tagtable_end
; t
++)
742 if (tag
->hdr
.tag
== t
->tag
) {
747 return t
< &__tagtable_end
;
751 * Parse all tags in the list, checking both the global and architecture
752 * specific tag tables.
754 static void __init
parse_tags(const struct tag
*t
)
756 for (; t
->hdr
.size
; t
= tag_next(t
))
759 "Ignoring unrecognised tag 0x%08x\n",
764 * This holds our defaults.
766 static struct init_tags
{
767 struct tag_header hdr1
;
768 struct tag_core core
;
769 struct tag_header hdr2
;
770 struct tag_mem32 mem
;
771 struct tag_header hdr3
;
772 } init_tags __initdata
= {
773 { tag_size(tag_core
), ATAG_CORE
},
774 { 1, PAGE_SIZE
, 0xff },
775 { tag_size(tag_mem32
), ATAG_MEM
},
780 static int __init
customize_machine(void)
782 /* customizes platform devices, or adds new ones */
783 if (machine_desc
->init_machine
)
784 machine_desc
->init_machine();
787 arch_initcall(customize_machine
);
790 static inline unsigned long long get_total_mem(void)
794 total
= max_low_pfn
- min_low_pfn
;
795 return total
<< PAGE_SHIFT
;
799 * reserve_crashkernel() - reserves memory are for crash kernel
801 * This function reserves memory area given in "crashkernel=" kernel command
802 * line parameter. The memory reserved is used by a dump capture kernel when
803 * primary kernel is crashing.
805 static void __init
reserve_crashkernel(void)
807 unsigned long long crash_size
, crash_base
;
808 unsigned long long total_mem
;
811 total_mem
= get_total_mem();
812 ret
= parse_crashkernel(boot_command_line
, total_mem
,
813 &crash_size
, &crash_base
);
817 ret
= reserve_bootmem(crash_base
, crash_size
, BOOTMEM_EXCLUSIVE
);
819 printk(KERN_WARNING
"crashkernel reservation failed - "
820 "memory is in use (0x%lx)\n", (unsigned long)crash_base
);
824 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
825 "for crashkernel (System RAM: %ldMB)\n",
826 (unsigned long)(crash_size
>> 20),
827 (unsigned long)(crash_base
>> 20),
828 (unsigned long)(total_mem
>> 20));
830 crashk_res
.start
= crash_base
;
831 crashk_res
.end
= crash_base
+ crash_size
- 1;
832 insert_resource(&iomem_resource
, &crashk_res
);
835 static inline void reserve_crashkernel(void) {}
836 #endif /* CONFIG_KEXEC */
838 static void __init
squash_mem_tags(struct tag
*tag
)
840 for (; tag
->hdr
.size
; tag
= tag_next(tag
))
841 if (tag
->hdr
.tag
== ATAG_MEM
)
842 tag
->hdr
.tag
= ATAG_NONE
;
845 static struct machine_desc
* __init
setup_machine_tags(unsigned int nr
)
847 struct tag
*tags
= (struct tag
*)&init_tags
;
848 struct machine_desc
*mdesc
= NULL
, *p
;
849 char *from
= default_command_line
;
851 init_tags
.mem
.start
= PHYS_OFFSET
;
854 * locate machine in the list of supported machines.
856 for_each_machine_desc(p
)
858 printk("Machine: %s\n", p
->name
);
864 early_print("\nError: unrecognized/unsupported machine ID"
865 " (r1 = 0x%08x).\n\n", nr
);
866 dump_machine_table(); /* does not return */
870 tags
= phys_to_virt(__atags_pointer
);
871 else if (mdesc
->atag_offset
)
872 tags
= (void *)(PAGE_OFFSET
+ mdesc
->atag_offset
);
874 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
876 * If we have the old style parameters, convert them to
879 if (tags
->hdr
.tag
!= ATAG_CORE
)
880 convert_to_tag_list(tags
);
883 if (tags
->hdr
.tag
!= ATAG_CORE
) {
884 #if defined(CONFIG_OF)
886 * If CONFIG_OF is set, then assume this is a reasonably
887 * modern system that should pass boot parameters
889 early_print("Warning: Neither atags nor dtb found\n");
891 tags
= (struct tag
*)&init_tags
;
895 mdesc
->fixup(tags
, &from
, &meminfo
);
897 if (tags
->hdr
.tag
== ATAG_CORE
) {
898 if (meminfo
.nr_banks
!= 0)
899 squash_mem_tags(tags
);
904 /* parse_early_param needs a boot_command_line */
905 strlcpy(boot_command_line
, from
, COMMAND_LINE_SIZE
);
910 static int __init
meminfo_cmp(const void *_a
, const void *_b
)
912 const struct membank
*a
= _a
, *b
= _b
;
913 long cmp
= bank_pfn_start(a
) - bank_pfn_start(b
);
914 return cmp
< 0 ? -1 : cmp
> 0 ? 1 : 0;
917 void __init
setup_arch(char **cmdline_p
)
919 struct machine_desc
*mdesc
;
922 mdesc
= setup_machine_fdt(__atags_pointer
);
924 mdesc
= setup_machine_tags(machine_arch_type
);
925 machine_desc
= mdesc
;
926 machine_name
= mdesc
->name
;
928 #ifdef CONFIG_ZONE_DMA
929 if (mdesc
->dma_zone_size
) {
930 extern unsigned long arm_dma_zone_size
;
931 arm_dma_zone_size
= mdesc
->dma_zone_size
;
934 if (mdesc
->restart_mode
)
935 reboot_setup(&mdesc
->restart_mode
);
937 init_mm
.start_code
= (unsigned long) _text
;
938 init_mm
.end_code
= (unsigned long) _etext
;
939 init_mm
.end_data
= (unsigned long) _edata
;
940 init_mm
.brk
= (unsigned long) _end
;
942 /* populate cmd_line too for later use, preserving boot_command_line */
943 strlcpy(cmd_line
, boot_command_line
, COMMAND_LINE_SIZE
);
944 *cmdline_p
= cmd_line
;
948 sort(&meminfo
.bank
, meminfo
.nr_banks
, sizeof(meminfo
.bank
[0]), meminfo_cmp
, NULL
);
949 sanity_check_meminfo();
950 arm_memblock_init(&meminfo
, mdesc
);
953 request_standard_resources(mdesc
);
956 arm_pm_restart
= mdesc
->restart
;
958 unflatten_device_tree();
964 reserve_crashkernel();
968 #ifdef CONFIG_MULTI_IRQ_HANDLER
969 handle_arch_irq
= mdesc
->handle_irq
;
973 #if defined(CONFIG_VGA_CONSOLE)
974 conswitchp
= &vga_con
;
975 #elif defined(CONFIG_DUMMY_CONSOLE)
976 conswitchp
= &dummy_con
;
981 if (mdesc
->init_early
)
986 static int __init
topology_init(void)
990 for_each_possible_cpu(cpu
) {
991 struct cpuinfo_arm
*cpuinfo
= &per_cpu(cpu_data
, cpu
);
992 cpuinfo
->cpu
.hotpluggable
= 1;
993 register_cpu(&cpuinfo
->cpu
, cpu
);
998 subsys_initcall(topology_init
);
1000 #ifdef CONFIG_HAVE_PROC_CPU
1001 static int __init
proc_cpu_init(void)
1003 struct proc_dir_entry
*res
;
1005 res
= proc_mkdir("cpu", NULL
);
1010 fs_initcall(proc_cpu_init
);
1013 static const char *hwcap_str
[] = {
1036 static int c_show(struct seq_file
*m
, void *v
)
1040 seq_printf(m
, "Processor\t: %s rev %d (%s)\n",
1041 cpu_name
, read_cpuid_id() & 15, elf_platform
);
1043 #if defined(CONFIG_SMP)
1044 for_each_online_cpu(i
) {
1046 * glibc reads /proc/cpuinfo to determine the number of
1047 * online processors, looking for lines beginning with
1048 * "processor". Give glibc what it expects.
1050 seq_printf(m
, "processor\t: %d\n", i
);
1051 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n\n",
1052 per_cpu(cpu_data
, i
).loops_per_jiffy
/ (500000UL/HZ
),
1053 (per_cpu(cpu_data
, i
).loops_per_jiffy
/ (5000UL/HZ
)) % 100);
1055 #else /* CONFIG_SMP */
1056 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n",
1057 loops_per_jiffy
/ (500000/HZ
),
1058 (loops_per_jiffy
/ (5000/HZ
)) % 100);
1061 /* dump out the processor features */
1062 seq_puts(m
, "Features\t: ");
1064 for (i
= 0; hwcap_str
[i
]; i
++)
1065 if (elf_hwcap
& (1 << i
))
1066 seq_printf(m
, "%s ", hwcap_str
[i
]);
1068 seq_printf(m
, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1069 seq_printf(m
, "CPU architecture: %s\n", proc_arch
[cpu_architecture()]);
1071 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1073 seq_printf(m
, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1075 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1077 seq_printf(m
, "CPU variant\t: 0x%02x\n",
1078 (read_cpuid_id() >> 16) & 127);
1081 seq_printf(m
, "CPU variant\t: 0x%x\n",
1082 (read_cpuid_id() >> 20) & 15);
1084 seq_printf(m
, "CPU part\t: 0x%03x\n",
1085 (read_cpuid_id() >> 4) & 0xfff);
1087 seq_printf(m
, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1091 seq_printf(m
, "Hardware\t: %s\n", machine_name
);
1092 seq_printf(m
, "Revision\t: %04x\n", system_rev
);
1093 seq_printf(m
, "Serial\t\t: %08x%08x\n",
1094 system_serial_high
, system_serial_low
);
1099 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
1101 return *pos
< 1 ? (void *)1 : NULL
;
1104 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1110 static void c_stop(struct seq_file
*m
, void *v
)
1114 const struct seq_operations cpuinfo_op
= {