2 * Copyright (C) 1995 Linus Torvalds
6 * This file handles the architecture-dependent parts of initialization
9 #include <linux/errno.h>
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/unistd.h>
15 #include <linux/ptrace.h>
16 #include <linux/slab.h>
17 #include <linux/user.h>
18 #include <linux/a.out.h>
19 #include <linux/screen_info.h>
20 #include <linux/ioport.h>
21 #include <linux/delay.h>
22 #include <linux/init.h>
23 #include <linux/initrd.h>
24 #include <linux/highmem.h>
25 #include <linux/bootmem.h>
26 #include <linux/module.h>
27 #include <asm/processor.h>
28 #include <linux/console.h>
29 #include <linux/seq_file.h>
30 #include <linux/crash_dump.h>
31 #include <linux/root_dev.h>
32 #include <linux/pci.h>
33 #include <linux/acpi.h>
34 #include <linux/kallsyms.h>
35 #include <linux/edd.h>
36 #include <linux/mmzone.h>
37 #include <linux/kexec.h>
38 #include <linux/cpufreq.h>
39 #include <linux/dmi.h>
40 #include <linux/dma-mapping.h>
41 #include <linux/ctype.h>
44 #include <asm/uaccess.h>
45 #include <asm/system.h>
50 #include <video/edid.h>
53 #include <asm/mpspec.h>
54 #include <asm/mmu_context.h>
55 #include <asm/proto.h>
56 #include <asm/setup.h>
57 #include <asm/mach_apic.h>
59 #include <asm/sections.h>
66 struct cpuinfo_x86 boot_cpu_data __read_mostly
;
67 EXPORT_SYMBOL(boot_cpu_data
);
69 unsigned long mmu_cr4_features
;
71 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
74 unsigned long saved_video_mode
;
76 int force_mwait __cpuinitdata
;
82 char dmi_alloc_data
[DMI_MAX_DATA
];
87 struct screen_info screen_info
;
88 EXPORT_SYMBOL(screen_info
);
89 struct sys_desc_table_struct
{
90 unsigned short length
;
91 unsigned char table
[0];
94 struct edid_info edid_info
;
95 EXPORT_SYMBOL_GPL(edid_info
);
97 extern int root_mountflags
;
99 char __initdata command_line
[COMMAND_LINE_SIZE
];
101 struct resource standard_io_resources
[] = {
102 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
103 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
104 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
105 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
106 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
107 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
108 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
109 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
110 { .name
= "keyboard", .start
= 0x60, .end
= 0x6f,
111 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
112 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
113 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
114 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
115 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
116 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
117 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
118 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
119 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
122 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
124 struct resource data_resource
= {
125 .name
= "Kernel data",
128 .flags
= IORESOURCE_RAM
,
130 struct resource code_resource
= {
131 .name
= "Kernel code",
134 .flags
= IORESOURCE_RAM
,
137 #ifdef CONFIG_PROC_VMCORE
138 /* elfcorehdr= specifies the location of elf core header
139 * stored by the crashed kernel. This option will be passed
140 * by kexec loader to the capture kernel.
142 static int __init
setup_elfcorehdr(char *arg
)
147 elfcorehdr_addr
= memparse(arg
, &end
);
148 return end
> arg
? 0 : -EINVAL
;
150 early_param("elfcorehdr", setup_elfcorehdr
);
155 contig_initmem_init(unsigned long start_pfn
, unsigned long end_pfn
)
157 unsigned long bootmap_size
, bootmap
;
159 bootmap_size
= bootmem_bootmap_pages(end_pfn
)<<PAGE_SHIFT
;
160 bootmap
= find_e820_area(0, end_pfn
<<PAGE_SHIFT
, bootmap_size
);
162 panic("Cannot find bootmem map of size %ld\n",bootmap_size
);
163 bootmap_size
= init_bootmem(bootmap
>> PAGE_SHIFT
, end_pfn
);
164 e820_register_active_regions(0, start_pfn
, end_pfn
);
165 free_bootmem_with_active_regions(0, end_pfn
);
166 reserve_bootmem(bootmap
, bootmap_size
);
170 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
172 #ifdef CONFIG_EDD_MODULE
176 * copy_edd() - Copy the BIOS EDD information
177 * from boot_params into a safe place.
180 static inline void copy_edd(void)
182 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
183 sizeof(edd
.mbr_signature
));
184 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
185 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
186 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
189 static inline void copy_edd(void)
195 static void __init
reserve_crashkernel(void)
197 unsigned long long free_mem
;
198 unsigned long long crash_size
, crash_base
;
201 free_mem
= ((unsigned long long)max_low_pfn
- min_low_pfn
) << PAGE_SHIFT
;
203 ret
= parse_crashkernel(boot_command_line
, free_mem
,
204 &crash_size
, &crash_base
);
205 if (ret
== 0 && crash_size
) {
206 if (crash_base
> 0) {
207 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
208 "for crashkernel (System RAM: %ldMB)\n",
209 (unsigned long)(crash_size
>> 20),
210 (unsigned long)(crash_base
>> 20),
211 (unsigned long)(free_mem
>> 20));
212 crashk_res
.start
= crash_base
;
213 crashk_res
.end
= crash_base
+ crash_size
- 1;
214 reserve_bootmem(crash_base
, crash_size
);
216 printk(KERN_INFO
"crashkernel reservation failed - "
217 "you have to specify a base address\n");
221 static inline void __init
reserve_crashkernel(void)
225 #define EBDA_ADDR_POINTER 0x40E
227 unsigned __initdata ebda_addr
;
228 unsigned __initdata ebda_size
;
230 static void discover_ebda(void)
233 * there is a real-mode segmented pointer pointing to the
234 * 4K EBDA area at 0x40E
236 ebda_addr
= *(unsigned short *)__va(EBDA_ADDR_POINTER
);
239 ebda_size
= *(unsigned short *)__va(ebda_addr
);
241 /* Round EBDA up to pages */
245 ebda_size
= round_up(ebda_size
+ (ebda_addr
& ~PAGE_MASK
), PAGE_SIZE
);
246 if (ebda_size
> 64*1024)
250 void __init
setup_arch(char **cmdline_p
)
252 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
254 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
255 screen_info
= boot_params
.screen_info
;
256 edid_info
= boot_params
.edid_info
;
257 saved_video_mode
= boot_params
.hdr
.vid_mode
;
258 bootloader_type
= boot_params
.hdr
.type_of_loader
;
260 #ifdef CONFIG_BLK_DEV_RAM
261 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
262 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
263 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
265 setup_memory_region();
268 if (!boot_params
.hdr
.root_flags
)
269 root_mountflags
&= ~MS_RDONLY
;
270 init_mm
.start_code
= (unsigned long) &_text
;
271 init_mm
.end_code
= (unsigned long) &_etext
;
272 init_mm
.end_data
= (unsigned long) &_edata
;
273 init_mm
.brk
= (unsigned long) &_end
;
275 code_resource
.start
= virt_to_phys(&_text
);
276 code_resource
.end
= virt_to_phys(&_etext
)-1;
277 data_resource
.start
= virt_to_phys(&_etext
);
278 data_resource
.end
= virt_to_phys(&_edata
)-1;
280 early_identify_cpu(&boot_cpu_data
);
282 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
283 *cmdline_p
= command_line
;
287 finish_e820_parsing();
289 e820_register_active_regions(0, 0, -1UL);
291 * partially used pages are not usable - thus
292 * we are rounding upwards:
294 end_pfn
= e820_end_of_ram();
295 num_physpages
= end_pfn
;
301 init_memory_mapping(0, (end_pfn_map
<< PAGE_SHIFT
));
307 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
308 * Call this early for SRAT node setup.
310 acpi_boot_table_init();
313 /* How many end-of-memory variables you have, grandma! */
314 max_low_pfn
= end_pfn
;
316 high_memory
= (void *)__va(end_pfn
* PAGE_SIZE
- 1) + 1;
318 /* Remove active ranges so rediscovery with NUMA-awareness happens */
319 remove_all_active_ranges();
321 #ifdef CONFIG_ACPI_NUMA
323 * Parse SRAT to discover nodes.
329 numa_initmem_init(0, end_pfn
);
331 contig_initmem_init(0, end_pfn
);
334 /* Reserve direct mapping */
335 reserve_bootmem_generic(table_start
<< PAGE_SHIFT
,
336 (table_end
- table_start
) << PAGE_SHIFT
);
339 reserve_bootmem_generic(__pa_symbol(&_text
),
340 __pa_symbol(&_end
) - __pa_symbol(&_text
));
343 * reserve physical page 0 - it's a special BIOS page on many boxes,
344 * enabling clean reboots, SMP operation, laptop functions.
346 reserve_bootmem_generic(0, PAGE_SIZE
);
348 /* reserve ebda region */
350 reserve_bootmem_generic(ebda_addr
, ebda_size
);
352 /* reserve nodemap region */
354 reserve_bootmem_generic(nodemap_addr
, nodemap_size
);
358 /* Reserve SMP trampoline */
359 reserve_bootmem_generic(SMP_TRAMPOLINE_BASE
, 2*PAGE_SIZE
);
362 #ifdef CONFIG_ACPI_SLEEP
364 * Reserve low memory region for sleep support.
366 acpi_reserve_bootmem();
369 * Find and reserve possible boot-time SMP configuration:
372 #ifdef CONFIG_BLK_DEV_INITRD
373 if (boot_params
.hdr
.type_of_loader
&& boot_params
.hdr
.ramdisk_image
) {
374 unsigned long ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
375 unsigned long ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
376 unsigned long ramdisk_end
= ramdisk_image
+ ramdisk_size
;
377 unsigned long end_of_mem
= end_pfn
<< PAGE_SHIFT
;
379 if (ramdisk_end
<= end_of_mem
) {
380 reserve_bootmem_generic(ramdisk_image
, ramdisk_size
);
381 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
382 initrd_end
= initrd_start
+ramdisk_size
;
384 printk(KERN_ERR
"initrd extends beyond end of memory "
385 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
386 ramdisk_end
, end_of_mem
);
391 reserve_crashkernel();
399 * set this early, so we dont allocate cpu0
400 * if MADT list doesnt list BSP first
401 * mpparse.c/MP_processor_info() allocates logical cpu numbers.
403 cpu_set(0, cpu_present_map
);
406 * Read APIC and some other early information from ACPI tables.
414 * get boot-time SMP configuration:
416 if (smp_found_config
)
418 init_apic_mappings();
421 * We trust e820 completely. No explicit ROM probing in memory.
423 e820_reserve_resources();
424 e820_mark_nosave_regions();
428 /* request I/O space for devices used on all i[345]86 PCs */
429 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
430 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
436 #if defined(CONFIG_VGA_CONSOLE)
437 conswitchp
= &vga_con
;
438 #elif defined(CONFIG_DUMMY_CONSOLE)
439 conswitchp
= &dummy_con
;
444 static int __cpuinit
get_model_name(struct cpuinfo_x86
*c
)
448 if (c
->extended_cpuid_level
< 0x80000004)
451 v
= (unsigned int *) c
->x86_model_id
;
452 cpuid(0x80000002, &v
[0], &v
[1], &v
[2], &v
[3]);
453 cpuid(0x80000003, &v
[4], &v
[5], &v
[6], &v
[7]);
454 cpuid(0x80000004, &v
[8], &v
[9], &v
[10], &v
[11]);
455 c
->x86_model_id
[48] = 0;
460 static void __cpuinit
display_cacheinfo(struct cpuinfo_x86
*c
)
462 unsigned int n
, dummy
, eax
, ebx
, ecx
, edx
;
464 n
= c
->extended_cpuid_level
;
466 if (n
>= 0x80000005) {
467 cpuid(0x80000005, &dummy
, &ebx
, &ecx
, &edx
);
468 printk(KERN_INFO
"CPU: L1 I Cache: %dK (%d bytes/line), D cache %dK (%d bytes/line)\n",
469 edx
>>24, edx
&0xFF, ecx
>>24, ecx
&0xFF);
470 c
->x86_cache_size
=(ecx
>>24)+(edx
>>24);
471 /* On K8 L1 TLB is inclusive, so don't count it */
475 if (n
>= 0x80000006) {
476 cpuid(0x80000006, &dummy
, &ebx
, &ecx
, &edx
);
477 ecx
= cpuid_ecx(0x80000006);
478 c
->x86_cache_size
= ecx
>> 16;
479 c
->x86_tlbsize
+= ((ebx
>> 16) & 0xfff) + (ebx
& 0xfff);
481 printk(KERN_INFO
"CPU: L2 Cache: %dK (%d bytes/line)\n",
482 c
->x86_cache_size
, ecx
& 0xFF);
486 cpuid(0x80000007, &dummy
, &dummy
, &dummy
, &c
->x86_power
);
487 if (n
>= 0x80000008) {
488 cpuid(0x80000008, &eax
, &dummy
, &dummy
, &dummy
);
489 c
->x86_virt_bits
= (eax
>> 8) & 0xff;
490 c
->x86_phys_bits
= eax
& 0xff;
495 static int nearby_node(int apicid
)
498 for (i
= apicid
- 1; i
>= 0; i
--) {
499 int node
= apicid_to_node
[i
];
500 if (node
!= NUMA_NO_NODE
&& node_online(node
))
503 for (i
= apicid
+ 1; i
< MAX_LOCAL_APIC
; i
++) {
504 int node
= apicid_to_node
[i
];
505 if (node
!= NUMA_NO_NODE
&& node_online(node
))
508 return first_node(node_online_map
); /* Shouldn't happen */
513 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
514 * Assumes number of cores is a power of two.
516 static void __init
amd_detect_cmp(struct cpuinfo_x86
*c
)
521 int cpu
= smp_processor_id();
523 unsigned apicid
= hard_smp_processor_id();
525 unsigned ecx
= cpuid_ecx(0x80000008);
527 c
->x86_max_cores
= (ecx
& 0xff) + 1;
529 /* CPU telling us the core id bits shift? */
530 bits
= (ecx
>> 12) & 0xF;
532 /* Otherwise recompute */
534 while ((1 << bits
) < c
->x86_max_cores
)
538 /* Low order bits define the core id (index of core in socket) */
539 c
->cpu_core_id
= c
->phys_proc_id
& ((1 << bits
)-1);
540 /* Convert the APIC ID into the socket ID */
541 c
->phys_proc_id
= phys_pkg_id(bits
);
544 node
= c
->phys_proc_id
;
545 if (apicid_to_node
[apicid
] != NUMA_NO_NODE
)
546 node
= apicid_to_node
[apicid
];
547 if (!node_online(node
)) {
548 /* Two possibilities here:
549 - The CPU is missing memory and no node was created.
550 In that case try picking one from a nearby CPU
551 - The APIC IDs differ from the HyperTransport node IDs
552 which the K8 northbridge parsing fills in.
553 Assume they are all increased by a constant offset,
554 but in the same order as the HT nodeids.
555 If that doesn't result in a usable node fall back to the
556 path for the previous case. */
557 int ht_nodeid
= apicid
- (cpu_data
[0].phys_proc_id
<< bits
);
558 if (ht_nodeid
>= 0 &&
559 apicid_to_node
[ht_nodeid
] != NUMA_NO_NODE
)
560 node
= apicid_to_node
[ht_nodeid
];
561 /* Pick a nearby node */
562 if (!node_online(node
))
563 node
= nearby_node(apicid
);
565 numa_set_node(cpu
, node
);
567 printk(KERN_INFO
"CPU %d/%x -> Node %d\n", cpu
, apicid
, node
);
572 #define ENABLE_C1E_MASK 0x18000000
573 #define CPUID_PROCESSOR_SIGNATURE 1
574 #define CPUID_XFAM 0x0ff00000
575 #define CPUID_XFAM_K8 0x00000000
576 #define CPUID_XFAM_10H 0x00100000
577 #define CPUID_XFAM_11H 0x00200000
578 #define CPUID_XMOD 0x000f0000
579 #define CPUID_XMOD_REV_F 0x00040000
581 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
582 static __cpuinit
int amd_apic_timer_broken(void)
585 u32 eax
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
586 switch (eax
& CPUID_XFAM
) {
588 if ((eax
& CPUID_XMOD
) < CPUID_XMOD_REV_F
)
592 rdmsr(MSR_K8_ENABLE_C1E
, lo
, hi
);
593 if (lo
& ENABLE_C1E_MASK
)
597 /* err on the side of caution */
603 static void __cpuinit
init_amd(struct cpuinfo_x86
*c
)
611 * Disable TLB flush filter by setting HWCR.FFDIS on K8
612 * bit 6 of msr C001_0015
614 * Errata 63 for SH-B3 steppings
615 * Errata 122 for all steppings (F+ have it disabled by default)
618 rdmsrl(MSR_K8_HWCR
, value
);
620 wrmsrl(MSR_K8_HWCR
, value
);
624 /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
625 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
626 clear_bit(0*32+31, &c
->x86_capability
);
628 /* On C+ stepping K8 rep microcode works well for copy/memset */
629 level
= cpuid_eax(1);
630 if (c
->x86
== 15 && ((level
>= 0x0f48 && level
< 0x0f50) || level
>= 0x0f58))
631 set_bit(X86_FEATURE_REP_GOOD
, &c
->x86_capability
);
632 if (c
->x86
== 0x10 || c
->x86
== 0x11)
633 set_bit(X86_FEATURE_REP_GOOD
, &c
->x86_capability
);
635 /* Enable workaround for FXSAVE leak */
637 set_bit(X86_FEATURE_FXSAVE_LEAK
, &c
->x86_capability
);
639 level
= get_model_name(c
);
643 /* Should distinguish Models here, but this is only
644 a fallback anyways. */
645 strcpy(c
->x86_model_id
, "Hammer");
649 display_cacheinfo(c
);
651 /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
652 if (c
->x86_power
& (1<<8))
653 set_bit(X86_FEATURE_CONSTANT_TSC
, &c
->x86_capability
);
655 /* Multi core CPU? */
656 if (c
->extended_cpuid_level
>= 0x80000008)
659 if (c
->extended_cpuid_level
>= 0x80000006 &&
660 (cpuid_edx(0x80000006) & 0xf000))
661 num_cache_leaves
= 4;
663 num_cache_leaves
= 3;
665 if (c
->x86
== 0xf || c
->x86
== 0x10 || c
->x86
== 0x11)
666 set_bit(X86_FEATURE_K8
, &c
->x86_capability
);
668 /* RDTSC can be speculated around */
669 clear_bit(X86_FEATURE_SYNC_RDTSC
, &c
->x86_capability
);
671 /* Family 10 doesn't support C states in MWAIT so don't use it */
672 if (c
->x86
== 0x10 && !force_mwait
)
673 clear_bit(X86_FEATURE_MWAIT
, &c
->x86_capability
);
675 if (amd_apic_timer_broken())
676 disable_apic_timer
= 1;
679 static void __cpuinit
detect_ht(struct cpuinfo_x86
*c
)
682 u32 eax
, ebx
, ecx
, edx
;
683 int index_msb
, core_bits
;
685 cpuid(1, &eax
, &ebx
, &ecx
, &edx
);
688 if (!cpu_has(c
, X86_FEATURE_HT
))
690 if (cpu_has(c
, X86_FEATURE_CMP_LEGACY
))
693 smp_num_siblings
= (ebx
& 0xff0000) >> 16;
695 if (smp_num_siblings
== 1) {
696 printk(KERN_INFO
"CPU: Hyper-Threading is disabled\n");
697 } else if (smp_num_siblings
> 1 ) {
699 if (smp_num_siblings
> NR_CPUS
) {
700 printk(KERN_WARNING
"CPU: Unsupported number of the siblings %d", smp_num_siblings
);
701 smp_num_siblings
= 1;
705 index_msb
= get_count_order(smp_num_siblings
);
706 c
->phys_proc_id
= phys_pkg_id(index_msb
);
708 smp_num_siblings
= smp_num_siblings
/ c
->x86_max_cores
;
710 index_msb
= get_count_order(smp_num_siblings
) ;
712 core_bits
= get_count_order(c
->x86_max_cores
);
714 c
->cpu_core_id
= phys_pkg_id(index_msb
) &
715 ((1 << core_bits
) - 1);
718 if ((c
->x86_max_cores
* smp_num_siblings
) > 1) {
719 printk(KERN_INFO
"CPU: Physical Processor ID: %d\n", c
->phys_proc_id
);
720 printk(KERN_INFO
"CPU: Processor Core ID: %d\n", c
->cpu_core_id
);
727 * find out the number of processor cores on the die
729 static int __cpuinit
intel_num_cpu_cores(struct cpuinfo_x86
*c
)
733 if (c
->cpuid_level
< 4)
736 cpuid_count(4, 0, &eax
, &t
, &t
, &t
);
739 return ((eax
>> 26) + 1);
744 static void srat_detect_node(void)
748 int cpu
= smp_processor_id();
749 int apicid
= hard_smp_processor_id();
751 /* Don't do the funky fallback heuristics the AMD version employs
753 node
= apicid_to_node
[apicid
];
754 if (node
== NUMA_NO_NODE
)
755 node
= first_node(node_online_map
);
756 numa_set_node(cpu
, node
);
758 printk(KERN_INFO
"CPU %d/%x -> Node %d\n", cpu
, apicid
, node
);
762 static void __cpuinit
init_intel(struct cpuinfo_x86
*c
)
767 init_intel_cacheinfo(c
);
768 if (c
->cpuid_level
> 9 ) {
769 unsigned eax
= cpuid_eax(10);
770 /* Check for version and the number of counters */
771 if ((eax
& 0xff) && (((eax
>>8) & 0xff) > 1))
772 set_bit(X86_FEATURE_ARCH_PERFMON
, &c
->x86_capability
);
777 rdmsr(MSR_IA32_MISC_ENABLE
, l1
, l2
);
779 set_bit(X86_FEATURE_BTS
, c
->x86_capability
);
781 set_bit(X86_FEATURE_PEBS
, c
->x86_capability
);
784 n
= c
->extended_cpuid_level
;
785 if (n
>= 0x80000008) {
786 unsigned eax
= cpuid_eax(0x80000008);
787 c
->x86_virt_bits
= (eax
>> 8) & 0xff;
788 c
->x86_phys_bits
= eax
& 0xff;
789 /* CPUID workaround for Intel 0F34 CPU */
790 if (c
->x86_vendor
== X86_VENDOR_INTEL
&&
791 c
->x86
== 0xF && c
->x86_model
== 0x3 &&
793 c
->x86_phys_bits
= 36;
797 c
->x86_cache_alignment
= c
->x86_clflush_size
* 2;
798 if ((c
->x86
== 0xf && c
->x86_model
>= 0x03) ||
799 (c
->x86
== 0x6 && c
->x86_model
>= 0x0e))
800 set_bit(X86_FEATURE_CONSTANT_TSC
, &c
->x86_capability
);
802 set_bit(X86_FEATURE_REP_GOOD
, &c
->x86_capability
);
804 set_bit(X86_FEATURE_SYNC_RDTSC
, &c
->x86_capability
);
806 clear_bit(X86_FEATURE_SYNC_RDTSC
, &c
->x86_capability
);
807 c
->x86_max_cores
= intel_num_cpu_cores(c
);
812 static void __cpuinit
get_cpu_vendor(struct cpuinfo_x86
*c
)
814 char *v
= c
->x86_vendor_id
;
816 if (!strcmp(v
, "AuthenticAMD"))
817 c
->x86_vendor
= X86_VENDOR_AMD
;
818 else if (!strcmp(v
, "GenuineIntel"))
819 c
->x86_vendor
= X86_VENDOR_INTEL
;
821 c
->x86_vendor
= X86_VENDOR_UNKNOWN
;
824 struct cpu_model_info
{
827 char *model_names
[16];
830 /* Do some early cpuid on the boot CPU to get some parameter that are
831 needed before check_bugs. Everything advanced is in identify_cpu
833 void __cpuinit
early_identify_cpu(struct cpuinfo_x86
*c
)
837 c
->loops_per_jiffy
= loops_per_jiffy
;
838 c
->x86_cache_size
= -1;
839 c
->x86_vendor
= X86_VENDOR_UNKNOWN
;
840 c
->x86_model
= c
->x86_mask
= 0; /* So far unknown... */
841 c
->x86_vendor_id
[0] = '\0'; /* Unset */
842 c
->x86_model_id
[0] = '\0'; /* Unset */
843 c
->x86_clflush_size
= 64;
844 c
->x86_cache_alignment
= c
->x86_clflush_size
;
845 c
->x86_max_cores
= 1;
846 c
->extended_cpuid_level
= 0;
847 memset(&c
->x86_capability
, 0, sizeof c
->x86_capability
);
849 /* Get vendor name */
850 cpuid(0x00000000, (unsigned int *)&c
->cpuid_level
,
851 (unsigned int *)&c
->x86_vendor_id
[0],
852 (unsigned int *)&c
->x86_vendor_id
[8],
853 (unsigned int *)&c
->x86_vendor_id
[4]);
857 /* Initialize the standard set of capabilities */
858 /* Note that the vendor-specific code below might override */
860 /* Intel-defined flags: level 0x00000001 */
861 if (c
->cpuid_level
>= 0x00000001) {
863 cpuid(0x00000001, &tfms
, &misc
, &c
->x86_capability
[4],
864 &c
->x86_capability
[0]);
865 c
->x86
= (tfms
>> 8) & 0xf;
866 c
->x86_model
= (tfms
>> 4) & 0xf;
867 c
->x86_mask
= tfms
& 0xf;
869 c
->x86
+= (tfms
>> 20) & 0xff;
871 c
->x86_model
+= ((tfms
>> 16) & 0xF) << 4;
872 if (c
->x86_capability
[0] & (1<<19))
873 c
->x86_clflush_size
= ((misc
>> 8) & 0xff) * 8;
875 /* Have CPUID level 0 only - unheard of */
880 c
->phys_proc_id
= (cpuid_ebx(1) >> 24) & 0xff;
885 * This does the hard work of actually picking apart the CPU stuff...
887 void __cpuinit
identify_cpu(struct cpuinfo_x86
*c
)
892 early_identify_cpu(c
);
894 /* AMD-defined flags: level 0x80000001 */
895 xlvl
= cpuid_eax(0x80000000);
896 c
->extended_cpuid_level
= xlvl
;
897 if ((xlvl
& 0xffff0000) == 0x80000000) {
898 if (xlvl
>= 0x80000001) {
899 c
->x86_capability
[1] = cpuid_edx(0x80000001);
900 c
->x86_capability
[6] = cpuid_ecx(0x80000001);
902 if (xlvl
>= 0x80000004)
903 get_model_name(c
); /* Default name */
906 /* Transmeta-defined flags: level 0x80860001 */
907 xlvl
= cpuid_eax(0x80860000);
908 if ((xlvl
& 0xffff0000) == 0x80860000) {
909 /* Don't set x86_cpuid_level here for now to not confuse. */
910 if (xlvl
>= 0x80860001)
911 c
->x86_capability
[2] = cpuid_edx(0x80860001);
914 init_scattered_cpuid_features(c
);
916 c
->apicid
= phys_pkg_id(0);
919 * Vendor-specific initialization. In this section we
920 * canonicalize the feature flags, meaning if there are
921 * features a certain CPU supports which CPUID doesn't
922 * tell us, CPUID claiming incorrect flags, or other bugs,
923 * we handle them here.
925 * At the end of this section, c->x86_capability better
926 * indicate the features this CPU genuinely supports!
928 switch (c
->x86_vendor
) {
933 case X86_VENDOR_INTEL
:
937 case X86_VENDOR_UNKNOWN
:
939 display_cacheinfo(c
);
943 select_idle_routine(c
);
947 * On SMP, boot_cpu_data holds the common feature set between
948 * all CPUs; so make sure that we indicate which features are
949 * common between the CPUs. The first time this routine gets
950 * executed, c == &boot_cpu_data.
952 if (c
!= &boot_cpu_data
) {
953 /* AND the already accumulated flags with these */
954 for (i
= 0 ; i
< NCAPINTS
; i
++)
955 boot_cpu_data
.x86_capability
[i
] &= c
->x86_capability
[i
];
958 #ifdef CONFIG_X86_MCE
961 if (c
!= &boot_cpu_data
)
964 numa_add_cpu(smp_processor_id());
969 void __cpuinit
print_cpu_info(struct cpuinfo_x86
*c
)
971 if (c
->x86_model_id
[0])
972 printk("%s", c
->x86_model_id
);
974 if (c
->x86_mask
|| c
->cpuid_level
>= 0)
975 printk(" stepping %02x\n", c
->x86_mask
);
981 * Get CPU information for use by the procfs.
984 static int show_cpuinfo(struct seq_file
*m
, void *v
)
986 struct cpuinfo_x86
*c
= v
;
989 * These flag bits must match the definitions in <asm/cpufeature.h>.
990 * NULL means this bit is undefined or reserved; either way it doesn't
991 * have meaning as far as Linux is concerned. Note that it's important
992 * to realize there is a difference between this table and CPUID -- if
993 * applications want to get the raw CPUID data, they should access
994 * /dev/cpu/<cpu_nr>/cpuid instead.
996 static const char *const x86_cap_flags
[] = {
998 "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
999 "cx8", "apic", NULL
, "sep", "mtrr", "pge", "mca", "cmov",
1000 "pat", "pse36", "pn", "clflush", NULL
, "dts", "acpi", "mmx",
1001 "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", "pbe",
1004 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1005 NULL
, NULL
, NULL
, "syscall", NULL
, NULL
, NULL
, NULL
,
1006 NULL
, NULL
, NULL
, NULL
, "nx", NULL
, "mmxext", NULL
,
1007 NULL
, "fxsr_opt", "pdpe1gb", "rdtscp", NULL
, "lm",
1008 "3dnowext", "3dnow",
1010 /* Transmeta-defined */
1011 "recovery", "longrun", NULL
, "lrti", NULL
, NULL
, NULL
, NULL
,
1012 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1013 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1014 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1016 /* Other (Linux-defined) */
1017 "cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr",
1018 NULL
, NULL
, NULL
, NULL
,
1019 "constant_tsc", "up", NULL
, "arch_perfmon",
1020 "pebs", "bts", NULL
, "sync_rdtsc",
1021 "rep_good", NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1022 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1024 /* Intel-defined (#2) */
1025 "pni", NULL
, NULL
, "monitor", "ds_cpl", "vmx", "smx", "est",
1026 "tm2", "ssse3", "cid", NULL
, NULL
, "cx16", "xtpr", NULL
,
1027 NULL
, NULL
, "dca", NULL
, NULL
, NULL
, NULL
, "popcnt",
1028 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1030 /* VIA/Cyrix/Centaur-defined */
1031 NULL
, NULL
, "rng", "rng_en", NULL
, NULL
, "ace", "ace_en",
1032 "ace2", "ace2_en", "phe", "phe_en", "pmm", "pmm_en", NULL
, NULL
,
1033 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1034 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1036 /* AMD-defined (#2) */
1037 "lahf_lm", "cmp_legacy", "svm", "extapic", "cr8_legacy",
1038 "altmovcr8", "abm", "sse4a",
1039 "misalignsse", "3dnowprefetch",
1040 "osvw", "ibs", NULL
, NULL
, NULL
, NULL
,
1041 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1042 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1044 /* Auxiliary (Linux-defined) */
1045 "ida", NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1046 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1047 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1048 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
,
1050 static const char *const x86_power_flags
[] = {
1051 "ts", /* temperature sensor */
1052 "fid", /* frequency id control */
1053 "vid", /* voltage id control */
1054 "ttp", /* thermal trip */
1059 "", /* tsc invariant mapped to constant_tsc */
1065 if (!cpu_online(c
-cpu_data
))
1069 seq_printf(m
,"processor\t: %u\n"
1071 "cpu family\t: %d\n"
1073 "model name\t: %s\n",
1074 (unsigned)(c
-cpu_data
),
1075 c
->x86_vendor_id
[0] ? c
->x86_vendor_id
: "unknown",
1078 c
->x86_model_id
[0] ? c
->x86_model_id
: "unknown");
1080 if (c
->x86_mask
|| c
->cpuid_level
>= 0)
1081 seq_printf(m
, "stepping\t: %d\n", c
->x86_mask
);
1083 seq_printf(m
, "stepping\t: unknown\n");
1085 if (cpu_has(c
,X86_FEATURE_TSC
)) {
1086 unsigned int freq
= cpufreq_quick_get((unsigned)(c
-cpu_data
));
1089 seq_printf(m
, "cpu MHz\t\t: %u.%03u\n",
1090 freq
/ 1000, (freq
% 1000));
1094 if (c
->x86_cache_size
>= 0)
1095 seq_printf(m
, "cache size\t: %d KB\n", c
->x86_cache_size
);
1098 if (smp_num_siblings
* c
->x86_max_cores
> 1) {
1099 int cpu
= c
- cpu_data
;
1100 seq_printf(m
, "physical id\t: %d\n", c
->phys_proc_id
);
1101 seq_printf(m
, "siblings\t: %d\n",
1102 cpus_weight(per_cpu(cpu_core_map
, cpu
)));
1103 seq_printf(m
, "core id\t\t: %d\n", c
->cpu_core_id
);
1104 seq_printf(m
, "cpu cores\t: %d\n", c
->booted_cores
);
1110 "fpu_exception\t: yes\n"
1111 "cpuid level\t: %d\n"
1118 for ( i
= 0 ; i
< 32*NCAPINTS
; i
++ )
1119 if (cpu_has(c
, i
) && x86_cap_flags
[i
] != NULL
)
1120 seq_printf(m
, " %s", x86_cap_flags
[i
]);
1123 seq_printf(m
, "\nbogomips\t: %lu.%02lu\n",
1124 c
->loops_per_jiffy
/(500000/HZ
),
1125 (c
->loops_per_jiffy
/(5000/HZ
)) % 100);
1127 if (c
->x86_tlbsize
> 0)
1128 seq_printf(m
, "TLB size\t: %d 4K pages\n", c
->x86_tlbsize
);
1129 seq_printf(m
, "clflush size\t: %d\n", c
->x86_clflush_size
);
1130 seq_printf(m
, "cache_alignment\t: %d\n", c
->x86_cache_alignment
);
1132 seq_printf(m
, "address sizes\t: %u bits physical, %u bits virtual\n",
1133 c
->x86_phys_bits
, c
->x86_virt_bits
);
1135 seq_printf(m
, "power management:");
1138 for (i
= 0; i
< 32; i
++)
1139 if (c
->x86_power
& (1 << i
)) {
1140 if (i
< ARRAY_SIZE(x86_power_flags
) &&
1142 seq_printf(m
, "%s%s",
1143 x86_power_flags
[i
][0]?" ":"",
1144 x86_power_flags
[i
]);
1146 seq_printf(m
, " [%d]", i
);
1150 seq_printf(m
, "\n\n");
1155 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
1157 return *pos
< NR_CPUS
? cpu_data
+ *pos
: NULL
;
1160 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1163 return c_start(m
, pos
);
1166 static void c_stop(struct seq_file
*m
, void *v
)
1170 struct seq_operations cpuinfo_op
= {
1174 .show
= show_cpuinfo
,