1 #include <linux/bootmem.h>
2 #include <linux/linkage.h>
3 #include <linux/bitops.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
6 #include <linux/percpu.h>
7 #include <linux/string.h>
8 #include <linux/delay.h>
9 #include <linux/sched.h>
10 #include <linux/init.h>
11 #include <linux/kgdb.h>
12 #include <linux/smp.h>
15 #include <asm/stackprotector.h>
16 #include <asm/perf_event.h>
17 #include <asm/mmu_context.h>
18 #include <asm/archrandom.h>
19 #include <asm/hypervisor.h>
20 #include <asm/processor.h>
21 #include <asm/debugreg.h>
22 #include <asm/sections.h>
23 #include <linux/topology.h>
24 #include <linux/cpumask.h>
25 #include <asm/pgtable.h>
26 #include <linux/atomic.h>
27 #include <asm/proto.h>
28 #include <asm/setup.h>
32 #include <asm/fpu-internal.h>
34 #include <linux/numa.h>
41 #ifdef CONFIG_X86_LOCAL_APIC
42 #include <asm/uv/uv.h>
47 /* all of these masks are initialized in setup_cpu_local_masks() */
48 cpumask_var_t cpu_initialized_mask
;
49 cpumask_var_t cpu_callout_mask
;
50 cpumask_var_t cpu_callin_mask
;
52 /* representing cpus for which sibling maps can be computed */
53 cpumask_var_t cpu_sibling_setup_mask
;
55 /* correctly size the local cpu masks */
56 void __init
setup_cpu_local_masks(void)
58 alloc_bootmem_cpumask_var(&cpu_initialized_mask
);
59 alloc_bootmem_cpumask_var(&cpu_callin_mask
);
60 alloc_bootmem_cpumask_var(&cpu_callout_mask
);
61 alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask
);
64 static void __cpuinit
default_init(struct cpuinfo_x86
*c
)
67 cpu_detect_cache_sizes(c
);
69 /* Not much we can do here... */
70 /* Check if at least it has cpuid */
71 if (c
->cpuid_level
== -1) {
72 /* No cpuid. It must be an ancient CPU */
74 strcpy(c
->x86_model_id
, "486");
76 strcpy(c
->x86_model_id
, "386");
81 static const struct cpu_dev __cpuinitconst default_cpu
= {
82 .c_init
= default_init
,
83 .c_vendor
= "Unknown",
84 .c_x86_vendor
= X86_VENDOR_UNKNOWN
,
87 static const struct cpu_dev
*this_cpu __cpuinitdata
= &default_cpu
;
89 DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page
, gdt_page
) = { .gdt
= {
92 * We need valid kernel segments for data and code in long mode too
93 * IRET will check the segment types kkeil 2000/10/28
94 * Also sysret mandates a special GDT layout
96 * TLS descriptors are currently at a different place compared to i386.
97 * Hopefully nobody expects them at a fixed place (Wine?)
99 [GDT_ENTRY_KERNEL32_CS
] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
100 [GDT_ENTRY_KERNEL_CS
] = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
101 [GDT_ENTRY_KERNEL_DS
] = GDT_ENTRY_INIT(0xc093, 0, 0xfffff),
102 [GDT_ENTRY_DEFAULT_USER32_CS
] = GDT_ENTRY_INIT(0xc0fb, 0, 0xfffff),
103 [GDT_ENTRY_DEFAULT_USER_DS
] = GDT_ENTRY_INIT(0xc0f3, 0, 0xfffff),
104 [GDT_ENTRY_DEFAULT_USER_CS
] = GDT_ENTRY_INIT(0xa0fb, 0, 0xfffff),
106 [GDT_ENTRY_KERNEL_CS
] = GDT_ENTRY_INIT(0xc09a, 0, 0xfffff),
107 [GDT_ENTRY_KERNEL_DS
] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
108 [GDT_ENTRY_DEFAULT_USER_CS
] = GDT_ENTRY_INIT(0xc0fa, 0, 0xfffff),
109 [GDT_ENTRY_DEFAULT_USER_DS
] = GDT_ENTRY_INIT(0xc0f2, 0, 0xfffff),
111 * Segments used for calling PnP BIOS have byte granularity.
112 * They code segments and data segments have fixed 64k limits,
113 * the transfer segment sizes are set at run time.
116 [GDT_ENTRY_PNPBIOS_CS32
] = GDT_ENTRY_INIT(0x409a, 0, 0xffff),
118 [GDT_ENTRY_PNPBIOS_CS16
] = GDT_ENTRY_INIT(0x009a, 0, 0xffff),
120 [GDT_ENTRY_PNPBIOS_DS
] = GDT_ENTRY_INIT(0x0092, 0, 0xffff),
122 [GDT_ENTRY_PNPBIOS_TS1
] = GDT_ENTRY_INIT(0x0092, 0, 0),
124 [GDT_ENTRY_PNPBIOS_TS2
] = GDT_ENTRY_INIT(0x0092, 0, 0),
126 * The APM segments have byte granularity and their bases
127 * are set at run time. All have 64k limits.
130 [GDT_ENTRY_APMBIOS_BASE
] = GDT_ENTRY_INIT(0x409a, 0, 0xffff),
132 [GDT_ENTRY_APMBIOS_BASE
+1] = GDT_ENTRY_INIT(0x009a, 0, 0xffff),
134 [GDT_ENTRY_APMBIOS_BASE
+2] = GDT_ENTRY_INIT(0x4092, 0, 0xffff),
136 [GDT_ENTRY_ESPFIX_SS
] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
137 [GDT_ENTRY_PERCPU
] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
138 GDT_STACK_CANARY_INIT
141 EXPORT_PER_CPU_SYMBOL_GPL(gdt_page
);
143 static int __init
x86_xsave_setup(char *s
)
145 setup_clear_cpu_cap(X86_FEATURE_XSAVE
);
146 setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT
);
149 __setup("noxsave", x86_xsave_setup
);
151 static int __init
x86_xsaveopt_setup(char *s
)
153 setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT
);
156 __setup("noxsaveopt", x86_xsaveopt_setup
);
159 static int cachesize_override __cpuinitdata
= -1;
160 static int disable_x86_serial_nr __cpuinitdata
= 1;
162 static int __init
cachesize_setup(char *str
)
164 get_option(&str
, &cachesize_override
);
167 __setup("cachesize=", cachesize_setup
);
169 static int __init
x86_fxsr_setup(char *s
)
171 setup_clear_cpu_cap(X86_FEATURE_FXSR
);
172 setup_clear_cpu_cap(X86_FEATURE_XMM
);
175 __setup("nofxsr", x86_fxsr_setup
);
177 static int __init
x86_sep_setup(char *s
)
179 setup_clear_cpu_cap(X86_FEATURE_SEP
);
182 __setup("nosep", x86_sep_setup
);
184 /* Standard macro to see if a specific flag is changeable */
185 static inline int flag_is_changeable_p(u32 flag
)
190 * Cyrix and IDT cpus allow disabling of CPUID
191 * so the code below may return different results
192 * when it is executed before and after enabling
193 * the CPUID. Add "volatile" to not allow gcc to
194 * optimize the subsequent calls to this function.
196 asm volatile ("pushfl \n\t"
207 : "=&r" (f1
), "=&r" (f2
)
210 return ((f1
^f2
) & flag
) != 0;
213 /* Probe for the CPUID instruction */
214 static int __cpuinit
have_cpuid_p(void)
216 return flag_is_changeable_p(X86_EFLAGS_ID
);
219 static void __cpuinit
squash_the_stupid_serial_number(struct cpuinfo_x86
*c
)
221 unsigned long lo
, hi
;
223 if (!cpu_has(c
, X86_FEATURE_PN
) || !disable_x86_serial_nr
)
226 /* Disable processor serial number: */
228 rdmsr(MSR_IA32_BBL_CR_CTL
, lo
, hi
);
230 wrmsr(MSR_IA32_BBL_CR_CTL
, lo
, hi
);
232 printk(KERN_NOTICE
"CPU serial number disabled.\n");
233 clear_cpu_cap(c
, X86_FEATURE_PN
);
235 /* Disabling the serial number may affect the cpuid level */
236 c
->cpuid_level
= cpuid_eax(0);
239 static int __init
x86_serial_nr_setup(char *s
)
241 disable_x86_serial_nr
= 0;
244 __setup("serialnumber", x86_serial_nr_setup
);
246 static inline int flag_is_changeable_p(u32 flag
)
250 /* Probe for the CPUID instruction */
251 static inline int have_cpuid_p(void)
255 static inline void squash_the_stupid_serial_number(struct cpuinfo_x86
*c
)
260 static int disable_smep __cpuinitdata
;
261 static __init
int setup_disable_smep(char *arg
)
266 __setup("nosmep", setup_disable_smep
);
268 static __cpuinit
void setup_smep(struct cpuinfo_x86
*c
)
270 if (cpu_has(c
, X86_FEATURE_SMEP
)) {
271 if (unlikely(disable_smep
)) {
272 setup_clear_cpu_cap(X86_FEATURE_SMEP
);
273 clear_in_cr4(X86_CR4_SMEP
);
275 set_in_cr4(X86_CR4_SMEP
);
280 * Some CPU features depend on higher CPUID levels, which may not always
281 * be available due to CPUID level capping or broken virtualization
282 * software. Add those features to this table to auto-disable them.
284 struct cpuid_dependent_feature
{
289 static const struct cpuid_dependent_feature __cpuinitconst
290 cpuid_dependent_features
[] = {
291 { X86_FEATURE_MWAIT
, 0x00000005 },
292 { X86_FEATURE_DCA
, 0x00000009 },
293 { X86_FEATURE_XSAVE
, 0x0000000d },
297 static void __cpuinit
filter_cpuid_features(struct cpuinfo_x86
*c
, bool warn
)
299 const struct cpuid_dependent_feature
*df
;
301 for (df
= cpuid_dependent_features
; df
->feature
; df
++) {
303 if (!cpu_has(c
, df
->feature
))
306 * Note: cpuid_level is set to -1 if unavailable, but
307 * extended_extended_level is set to 0 if unavailable
308 * and the legitimate extended levels are all negative
309 * when signed; hence the weird messing around with
312 if (!((s32
)df
->level
< 0 ?
313 (u32
)df
->level
> (u32
)c
->extended_cpuid_level
:
314 (s32
)df
->level
> (s32
)c
->cpuid_level
))
317 clear_cpu_cap(c
, df
->feature
);
322 "CPU: CPU feature %s disabled, no CPUID level 0x%x\n",
323 x86_cap_flags
[df
->feature
], df
->level
);
328 * Naming convention should be: <Name> [(<Codename>)]
329 * This table only is used unless init_<vendor>() below doesn't set it;
330 * in particular, if CPUID levels 0x80000002..4 are supported, this
334 /* Look up CPU names by table lookup. */
335 static const char *__cpuinit
table_lookup_model(struct cpuinfo_x86
*c
)
337 const struct cpu_model_info
*info
;
339 if (c
->x86_model
>= 16)
340 return NULL
; /* Range check */
345 info
= this_cpu
->c_models
;
347 while (info
&& info
->family
) {
348 if (info
->family
== c
->x86
)
349 return info
->model_names
[c
->x86_model
];
352 return NULL
; /* Not found */
355 __u32 cpu_caps_cleared
[NCAPINTS
] __cpuinitdata
;
356 __u32 cpu_caps_set
[NCAPINTS
] __cpuinitdata
;
358 void load_percpu_segment(int cpu
)
361 loadsegment(fs
, __KERNEL_PERCPU
);
364 wrmsrl(MSR_GS_BASE
, (unsigned long)per_cpu(irq_stack_union
.gs_base
, cpu
));
366 load_stack_canary_segment();
370 * Current gdt points %fs at the "master" per-cpu area: after this,
371 * it's on the real one.
373 void switch_to_new_gdt(int cpu
)
375 struct desc_ptr gdt_descr
;
377 gdt_descr
.address
= (long)get_cpu_gdt_table(cpu
);
378 gdt_descr
.size
= GDT_SIZE
- 1;
379 load_gdt(&gdt_descr
);
380 /* Reload the per-cpu base */
382 load_percpu_segment(cpu
);
385 static const struct cpu_dev
*__cpuinitdata cpu_devs
[X86_VENDOR_NUM
] = {};
387 static void __cpuinit
get_model_name(struct cpuinfo_x86
*c
)
392 if (c
->extended_cpuid_level
< 0x80000004)
395 v
= (unsigned int *)c
->x86_model_id
;
396 cpuid(0x80000002, &v
[0], &v
[1], &v
[2], &v
[3]);
397 cpuid(0x80000003, &v
[4], &v
[5], &v
[6], &v
[7]);
398 cpuid(0x80000004, &v
[8], &v
[9], &v
[10], &v
[11]);
399 c
->x86_model_id
[48] = 0;
402 * Intel chips right-justify this string for some dumb reason;
403 * undo that brain damage:
405 p
= q
= &c
->x86_model_id
[0];
411 while (q
<= &c
->x86_model_id
[48])
412 *q
++ = '\0'; /* Zero-pad the rest */
416 void __cpuinit
cpu_detect_cache_sizes(struct cpuinfo_x86
*c
)
418 unsigned int n
, dummy
, ebx
, ecx
, edx
, l2size
;
420 n
= c
->extended_cpuid_level
;
422 if (n
>= 0x80000005) {
423 cpuid(0x80000005, &dummy
, &ebx
, &ecx
, &edx
);
424 c
->x86_cache_size
= (ecx
>>24) + (edx
>>24);
426 /* On K8 L1 TLB is inclusive, so don't count it */
431 if (n
< 0x80000006) /* Some chips just has a large L1. */
434 cpuid(0x80000006, &dummy
, &ebx
, &ecx
, &edx
);
438 c
->x86_tlbsize
+= ((ebx
>> 16) & 0xfff) + (ebx
& 0xfff);
440 /* do processor-specific cache resizing */
441 if (this_cpu
->c_size_cache
)
442 l2size
= this_cpu
->c_size_cache(c
, l2size
);
444 /* Allow user to override all this if necessary. */
445 if (cachesize_override
!= -1)
446 l2size
= cachesize_override
;
449 return; /* Again, no L2 cache is possible */
452 c
->x86_cache_size
= l2size
;
455 u16 __read_mostly tlb_lli_4k
[NR_INFO
];
456 u16 __read_mostly tlb_lli_2m
[NR_INFO
];
457 u16 __read_mostly tlb_lli_4m
[NR_INFO
];
458 u16 __read_mostly tlb_lld_4k
[NR_INFO
];
459 u16 __read_mostly tlb_lld_2m
[NR_INFO
];
460 u16 __read_mostly tlb_lld_4m
[NR_INFO
];
463 * tlb_flushall_shift shows the balance point in replacing cr3 write
464 * with multiple 'invlpg'. It will do this replacement when
465 * flush_tlb_lines <= active_lines/2^tlb_flushall_shift.
466 * If tlb_flushall_shift is -1, means the replacement will be disabled.
468 s8 __read_mostly tlb_flushall_shift
= -1;
470 void __cpuinit
cpu_detect_tlb(struct cpuinfo_x86
*c
)
472 if (this_cpu
->c_detect_tlb
)
473 this_cpu
->c_detect_tlb(c
);
475 printk(KERN_INFO
"Last level iTLB entries: 4KB %d, 2MB %d, 4MB %d\n" \
476 "Last level dTLB entries: 4KB %d, 2MB %d, 4MB %d\n" \
477 "tlb_flushall_shift: %d\n",
478 tlb_lli_4k
[ENTRIES
], tlb_lli_2m
[ENTRIES
],
479 tlb_lli_4m
[ENTRIES
], tlb_lld_4k
[ENTRIES
],
480 tlb_lld_2m
[ENTRIES
], tlb_lld_4m
[ENTRIES
],
484 void __cpuinit
detect_ht(struct cpuinfo_x86
*c
)
487 u32 eax
, ebx
, ecx
, edx
;
488 int index_msb
, core_bits
;
491 if (!cpu_has(c
, X86_FEATURE_HT
))
494 if (cpu_has(c
, X86_FEATURE_CMP_LEGACY
))
497 if (cpu_has(c
, X86_FEATURE_XTOPOLOGY
))
500 cpuid(1, &eax
, &ebx
, &ecx
, &edx
);
502 smp_num_siblings
= (ebx
& 0xff0000) >> 16;
504 if (smp_num_siblings
== 1) {
505 printk_once(KERN_INFO
"CPU0: Hyper-Threading is disabled\n");
509 if (smp_num_siblings
<= 1)
512 index_msb
= get_count_order(smp_num_siblings
);
513 c
->phys_proc_id
= apic
->phys_pkg_id(c
->initial_apicid
, index_msb
);
515 smp_num_siblings
= smp_num_siblings
/ c
->x86_max_cores
;
517 index_msb
= get_count_order(smp_num_siblings
);
519 core_bits
= get_count_order(c
->x86_max_cores
);
521 c
->cpu_core_id
= apic
->phys_pkg_id(c
->initial_apicid
, index_msb
) &
522 ((1 << core_bits
) - 1);
525 if (!printed
&& (c
->x86_max_cores
* smp_num_siblings
) > 1) {
526 printk(KERN_INFO
"CPU: Physical Processor ID: %d\n",
528 printk(KERN_INFO
"CPU: Processor Core ID: %d\n",
535 static void __cpuinit
get_cpu_vendor(struct cpuinfo_x86
*c
)
537 char *v
= c
->x86_vendor_id
;
540 for (i
= 0; i
< X86_VENDOR_NUM
; i
++) {
544 if (!strcmp(v
, cpu_devs
[i
]->c_ident
[0]) ||
545 (cpu_devs
[i
]->c_ident
[1] &&
546 !strcmp(v
, cpu_devs
[i
]->c_ident
[1]))) {
548 this_cpu
= cpu_devs
[i
];
549 c
->x86_vendor
= this_cpu
->c_x86_vendor
;
555 "CPU: vendor_id '%s' unknown, using generic init.\n" \
556 "CPU: Your system may be unstable.\n", v
);
558 c
->x86_vendor
= X86_VENDOR_UNKNOWN
;
559 this_cpu
= &default_cpu
;
562 void __cpuinit
cpu_detect(struct cpuinfo_x86
*c
)
564 /* Get vendor name */
565 cpuid(0x00000000, (unsigned int *)&c
->cpuid_level
,
566 (unsigned int *)&c
->x86_vendor_id
[0],
567 (unsigned int *)&c
->x86_vendor_id
[8],
568 (unsigned int *)&c
->x86_vendor_id
[4]);
571 /* Intel-defined flags: level 0x00000001 */
572 if (c
->cpuid_level
>= 0x00000001) {
573 u32 junk
, tfms
, cap0
, misc
;
575 cpuid(0x00000001, &tfms
, &misc
, &junk
, &cap0
);
576 c
->x86
= (tfms
>> 8) & 0xf;
577 c
->x86_model
= (tfms
>> 4) & 0xf;
578 c
->x86_mask
= tfms
& 0xf;
581 c
->x86
+= (tfms
>> 20) & 0xff;
583 c
->x86_model
+= ((tfms
>> 16) & 0xf) << 4;
585 if (cap0
& (1<<19)) {
586 c
->x86_clflush_size
= ((misc
>> 8) & 0xff) * 8;
587 c
->x86_cache_alignment
= c
->x86_clflush_size
;
592 void __cpuinit
get_cpu_cap(struct cpuinfo_x86
*c
)
597 /* Intel-defined flags: level 0x00000001 */
598 if (c
->cpuid_level
>= 0x00000001) {
599 u32 capability
, excap
;
601 cpuid(0x00000001, &tfms
, &ebx
, &excap
, &capability
);
602 c
->x86_capability
[0] = capability
;
603 c
->x86_capability
[4] = excap
;
606 /* Additional Intel-defined flags: level 0x00000007 */
607 if (c
->cpuid_level
>= 0x00000007) {
608 u32 eax
, ebx
, ecx
, edx
;
610 cpuid_count(0x00000007, 0, &eax
, &ebx
, &ecx
, &edx
);
612 c
->x86_capability
[9] = ebx
;
615 /* AMD-defined flags: level 0x80000001 */
616 xlvl
= cpuid_eax(0x80000000);
617 c
->extended_cpuid_level
= xlvl
;
619 if ((xlvl
& 0xffff0000) == 0x80000000) {
620 if (xlvl
>= 0x80000001) {
621 c
->x86_capability
[1] = cpuid_edx(0x80000001);
622 c
->x86_capability
[6] = cpuid_ecx(0x80000001);
626 if (c
->extended_cpuid_level
>= 0x80000008) {
627 u32 eax
= cpuid_eax(0x80000008);
629 c
->x86_virt_bits
= (eax
>> 8) & 0xff;
630 c
->x86_phys_bits
= eax
& 0xff;
633 else if (cpu_has(c
, X86_FEATURE_PAE
) || cpu_has(c
, X86_FEATURE_PSE36
))
634 c
->x86_phys_bits
= 36;
637 if (c
->extended_cpuid_level
>= 0x80000007)
638 c
->x86_power
= cpuid_edx(0x80000007);
640 init_scattered_cpuid_features(c
);
643 static void __cpuinit
identify_cpu_without_cpuid(struct cpuinfo_x86
*c
)
649 * First of all, decide if this is a 486 or higher
650 * It's a 486 if we can modify the AC flag
652 if (flag_is_changeable_p(X86_EFLAGS_AC
))
657 for (i
= 0; i
< X86_VENDOR_NUM
; i
++)
658 if (cpu_devs
[i
] && cpu_devs
[i
]->c_identify
) {
659 c
->x86_vendor_id
[0] = 0;
660 cpu_devs
[i
]->c_identify(c
);
661 if (c
->x86_vendor_id
[0]) {
670 * Do minimum CPU detection early.
671 * Fields really needed: vendor, cpuid_level, family, model, mask,
673 * The others are not touched to avoid unwanted side effects.
675 * WARNING: this function is only called on the BP. Don't add code here
676 * that is supposed to run on all CPUs.
678 static void __init
early_identify_cpu(struct cpuinfo_x86
*c
)
681 c
->x86_clflush_size
= 64;
682 c
->x86_phys_bits
= 36;
683 c
->x86_virt_bits
= 48;
685 c
->x86_clflush_size
= 32;
686 c
->x86_phys_bits
= 32;
687 c
->x86_virt_bits
= 32;
689 c
->x86_cache_alignment
= c
->x86_clflush_size
;
691 memset(&c
->x86_capability
, 0, sizeof c
->x86_capability
);
692 c
->extended_cpuid_level
= 0;
695 identify_cpu_without_cpuid(c
);
697 /* cyrix could have cpuid enabled via c_identify()*/
707 if (this_cpu
->c_early_init
)
708 this_cpu
->c_early_init(c
);
711 filter_cpuid_features(c
, false);
715 if (this_cpu
->c_bsp_init
)
716 this_cpu
->c_bsp_init(c
);
719 void __init
early_cpu_init(void)
721 const struct cpu_dev
*const *cdev
;
724 #ifdef CONFIG_PROCESSOR_SELECT
725 printk(KERN_INFO
"KERNEL supported cpus:\n");
728 for (cdev
= __x86_cpu_dev_start
; cdev
< __x86_cpu_dev_end
; cdev
++) {
729 const struct cpu_dev
*cpudev
= *cdev
;
731 if (count
>= X86_VENDOR_NUM
)
733 cpu_devs
[count
] = cpudev
;
736 #ifdef CONFIG_PROCESSOR_SELECT
740 for (j
= 0; j
< 2; j
++) {
741 if (!cpudev
->c_ident
[j
])
743 printk(KERN_INFO
" %s %s\n", cpudev
->c_vendor
,
749 early_identify_cpu(&boot_cpu_data
);
753 * The NOPL instruction is supposed to exist on all CPUs of family >= 6;
754 * unfortunately, that's not true in practice because of early VIA
755 * chips and (more importantly) broken virtualizers that are not easy
756 * to detect. In the latter case it doesn't even *fail* reliably, so
757 * probing for it doesn't even work. Disable it completely on 32-bit
758 * unless we can find a reliable way to detect all the broken cases.
759 * Enable it explicitly on 64-bit for non-constant inputs of cpu_has().
761 static void __cpuinit
detect_nopl(struct cpuinfo_x86
*c
)
764 clear_cpu_cap(c
, X86_FEATURE_NOPL
);
766 set_cpu_cap(c
, X86_FEATURE_NOPL
);
770 static void __cpuinit
generic_identify(struct cpuinfo_x86
*c
)
772 c
->extended_cpuid_level
= 0;
775 identify_cpu_without_cpuid(c
);
777 /* cyrix could have cpuid enabled via c_identify()*/
787 if (c
->cpuid_level
>= 0x00000001) {
788 c
->initial_apicid
= (cpuid_ebx(1) >> 24) & 0xFF;
790 # ifdef CONFIG_X86_HT
791 c
->apicid
= apic
->phys_pkg_id(c
->initial_apicid
, 0);
793 c
->apicid
= c
->initial_apicid
;
796 c
->phys_proc_id
= c
->initial_apicid
;
801 get_model_name(c
); /* Default name */
807 * This does the hard work of actually picking apart the CPU stuff...
809 static void __cpuinit
identify_cpu(struct cpuinfo_x86
*c
)
813 c
->loops_per_jiffy
= loops_per_jiffy
;
814 c
->x86_cache_size
= -1;
815 c
->x86_vendor
= X86_VENDOR_UNKNOWN
;
816 c
->x86_model
= c
->x86_mask
= 0; /* So far unknown... */
817 c
->x86_vendor_id
[0] = '\0'; /* Unset */
818 c
->x86_model_id
[0] = '\0'; /* Unset */
819 c
->x86_max_cores
= 1;
820 c
->x86_coreid_bits
= 0;
822 c
->x86_clflush_size
= 64;
823 c
->x86_phys_bits
= 36;
824 c
->x86_virt_bits
= 48;
826 c
->cpuid_level
= -1; /* CPUID not detected */
827 c
->x86_clflush_size
= 32;
828 c
->x86_phys_bits
= 32;
829 c
->x86_virt_bits
= 32;
831 c
->x86_cache_alignment
= c
->x86_clflush_size
;
832 memset(&c
->x86_capability
, 0, sizeof c
->x86_capability
);
836 if (this_cpu
->c_identify
)
837 this_cpu
->c_identify(c
);
839 /* Clear/Set all flags overriden by options, after probe */
840 for (i
= 0; i
< NCAPINTS
; i
++) {
841 c
->x86_capability
[i
] &= ~cpu_caps_cleared
[i
];
842 c
->x86_capability
[i
] |= cpu_caps_set
[i
];
846 c
->apicid
= apic
->phys_pkg_id(c
->initial_apicid
, 0);
850 * Vendor-specific initialization. In this section we
851 * canonicalize the feature flags, meaning if there are
852 * features a certain CPU supports which CPUID doesn't
853 * tell us, CPUID claiming incorrect flags, or other bugs,
854 * we handle them here.
856 * At the end of this section, c->x86_capability better
857 * indicate the features this CPU genuinely supports!
859 if (this_cpu
->c_init
)
862 /* Disable the PN if appropriate */
863 squash_the_stupid_serial_number(c
);
866 * The vendor-specific functions might have changed features.
867 * Now we do "generic changes."
870 /* Filter out anything that depends on CPUID levels we don't have */
871 filter_cpuid_features(c
, true);
873 /* If the model name is still unset, do table lookup. */
874 if (!c
->x86_model_id
[0]) {
876 p
= table_lookup_model(c
);
878 strcpy(c
->x86_model_id
, p
);
881 sprintf(c
->x86_model_id
, "%02x/%02x",
882 c
->x86
, c
->x86_model
);
893 * Clear/Set all flags overriden by options, need do it
894 * before following smp all cpus cap AND.
896 for (i
= 0; i
< NCAPINTS
; i
++) {
897 c
->x86_capability
[i
] &= ~cpu_caps_cleared
[i
];
898 c
->x86_capability
[i
] |= cpu_caps_set
[i
];
902 * On SMP, boot_cpu_data holds the common feature set between
903 * all CPUs; so make sure that we indicate which features are
904 * common between the CPUs. The first time this routine gets
905 * executed, c == &boot_cpu_data.
907 if (c
!= &boot_cpu_data
) {
908 /* AND the already accumulated flags with these */
909 for (i
= 0; i
< NCAPINTS
; i
++)
910 boot_cpu_data
.x86_capability
[i
] &= c
->x86_capability
[i
];
913 /* Init Machine Check Exception if available. */
916 select_idle_routine(c
);
919 numa_add_cpu(smp_processor_id());
924 static void vgetcpu_set_mode(void)
926 if (cpu_has(&boot_cpu_data
, X86_FEATURE_RDTSCP
))
927 vgetcpu_mode
= VGETCPU_RDTSCP
;
929 vgetcpu_mode
= VGETCPU_LSL
;
933 void __init
identify_boot_cpu(void)
935 identify_cpu(&boot_cpu_data
);
936 init_amd_e400_c1e_mask();
943 cpu_detect_tlb(&boot_cpu_data
);
946 void __cpuinit
identify_secondary_cpu(struct cpuinfo_x86
*c
)
948 BUG_ON(c
== &boot_cpu_data
);
961 static const struct msr_range msr_range_array
[] __cpuinitconst
= {
962 { 0x00000000, 0x00000418},
963 { 0xc0000000, 0xc000040b},
964 { 0xc0010000, 0xc0010142},
965 { 0xc0011000, 0xc001103b},
968 static void __cpuinit
__print_cpu_msr(void)
970 unsigned index_min
, index_max
;
975 for (i
= 0; i
< ARRAY_SIZE(msr_range_array
); i
++) {
976 index_min
= msr_range_array
[i
].min
;
977 index_max
= msr_range_array
[i
].max
;
979 for (index
= index_min
; index
< index_max
; index
++) {
980 if (rdmsrl_safe(index
, &val
))
982 printk(KERN_INFO
" MSR%08x: %016llx\n", index
, val
);
987 static int show_msr __cpuinitdata
;
989 static __init
int setup_show_msr(char *arg
)
993 get_option(&arg
, &num
);
999 __setup("show_msr=", setup_show_msr
);
1001 static __init
int setup_noclflush(char *arg
)
1003 setup_clear_cpu_cap(X86_FEATURE_CLFLSH
);
1006 __setup("noclflush", setup_noclflush
);
1008 void __cpuinit
print_cpu_info(struct cpuinfo_x86
*c
)
1010 const char *vendor
= NULL
;
1012 if (c
->x86_vendor
< X86_VENDOR_NUM
) {
1013 vendor
= this_cpu
->c_vendor
;
1015 if (c
->cpuid_level
>= 0)
1016 vendor
= c
->x86_vendor_id
;
1019 if (vendor
&& !strstr(c
->x86_model_id
, vendor
))
1020 printk(KERN_CONT
"%s ", vendor
);
1022 if (c
->x86_model_id
[0])
1023 printk(KERN_CONT
"%s", c
->x86_model_id
);
1025 printk(KERN_CONT
"%d86", c
->x86
);
1027 if (c
->x86_mask
|| c
->cpuid_level
>= 0)
1028 printk(KERN_CONT
" stepping %02x\n", c
->x86_mask
);
1030 printk(KERN_CONT
"\n");
1035 void __cpuinit
print_cpu_msr(struct cpuinfo_x86
*c
)
1037 if (c
->cpu_index
< show_msr
)
1041 static __init
int setup_disablecpuid(char *arg
)
1045 if (get_option(&arg
, &bit
) && bit
< NCAPINTS
*32)
1046 setup_clear_cpu_cap(bit
);
1052 __setup("clearcpuid=", setup_disablecpuid
);
1054 #ifdef CONFIG_X86_64
1055 struct desc_ptr idt_descr
= { NR_VECTORS
* 16 - 1, (unsigned long) idt_table
};
1056 struct desc_ptr nmi_idt_descr
= { NR_VECTORS
* 16 - 1,
1057 (unsigned long) nmi_idt_table
};
1059 DEFINE_PER_CPU_FIRST(union irq_stack_union
,
1060 irq_stack_union
) __aligned(PAGE_SIZE
);
1063 * The following four percpu variables are hot. Align current_task to
1064 * cacheline size such that all four fall in the same cacheline.
1066 DEFINE_PER_CPU(struct task_struct
*, current_task
) ____cacheline_aligned
=
1068 EXPORT_PER_CPU_SYMBOL(current_task
);
1070 DEFINE_PER_CPU(unsigned long, kernel_stack
) =
1071 (unsigned long)&init_thread_union
- KERNEL_STACK_OFFSET
+ THREAD_SIZE
;
1072 EXPORT_PER_CPU_SYMBOL(kernel_stack
);
1074 DEFINE_PER_CPU(char *, irq_stack_ptr
) =
1075 init_per_cpu_var(irq_stack_union
.irq_stack
) + IRQ_STACK_SIZE
- 64;
1077 DEFINE_PER_CPU(unsigned int, irq_count
) = -1;
1079 DEFINE_PER_CPU(struct task_struct
*, fpu_owner_task
);
1082 * Special IST stacks which the CPU switches to when it calls
1083 * an IST-marked descriptor entry. Up to 7 stacks (hardware
1084 * limit), all of them are 4K, except the debug stack which
1087 static const unsigned int exception_stack_sizes
[N_EXCEPTION_STACKS
] = {
1088 [0 ... N_EXCEPTION_STACKS
- 1] = EXCEPTION_STKSZ
,
1089 [DEBUG_STACK
- 1] = DEBUG_STKSZ
1092 static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks
1093 [(N_EXCEPTION_STACKS
- 1) * EXCEPTION_STKSZ
+ DEBUG_STKSZ
]);
1095 /* May not be marked __init: used by software suspend */
1096 void syscall_init(void)
1099 * LSTAR and STAR live in a bit strange symbiosis.
1100 * They both write to the same internal register. STAR allows to
1101 * set CS/DS but only a 32bit target. LSTAR sets the 64bit rip.
1103 wrmsrl(MSR_STAR
, ((u64
)__USER32_CS
)<<48 | ((u64
)__KERNEL_CS
)<<32);
1104 wrmsrl(MSR_LSTAR
, system_call
);
1105 wrmsrl(MSR_CSTAR
, ignore_sysret
);
1107 #ifdef CONFIG_IA32_EMULATION
1108 syscall32_cpu_init();
1111 /* Flags to clear on syscall */
1112 wrmsrl(MSR_SYSCALL_MASK
,
1113 X86_EFLAGS_TF
|X86_EFLAGS_DF
|X86_EFLAGS_IF
|X86_EFLAGS_IOPL
);
1116 unsigned long kernel_eflags
;
1119 * Copies of the original ist values from the tss are only accessed during
1120 * debugging, no special alignment required.
1122 DEFINE_PER_CPU(struct orig_ist
, orig_ist
);
1124 static DEFINE_PER_CPU(unsigned long, debug_stack_addr
);
1125 DEFINE_PER_CPU(int, debug_stack_usage
);
1127 int is_debug_stack(unsigned long addr
)
1129 return __get_cpu_var(debug_stack_usage
) ||
1130 (addr
<= __get_cpu_var(debug_stack_addr
) &&
1131 addr
> (__get_cpu_var(debug_stack_addr
) - DEBUG_STKSZ
));
1134 static DEFINE_PER_CPU(u32
, debug_stack_use_ctr
);
1136 void debug_stack_set_zero(void)
1138 this_cpu_inc(debug_stack_use_ctr
);
1139 load_idt((const struct desc_ptr
*)&nmi_idt_descr
);
1142 void debug_stack_reset(void)
1144 if (WARN_ON(!this_cpu_read(debug_stack_use_ctr
)))
1146 if (this_cpu_dec_return(debug_stack_use_ctr
) == 0)
1147 load_idt((const struct desc_ptr
*)&idt_descr
);
1150 #else /* CONFIG_X86_64 */
1152 DEFINE_PER_CPU(struct task_struct
*, current_task
) = &init_task
;
1153 EXPORT_PER_CPU_SYMBOL(current_task
);
1154 DEFINE_PER_CPU(struct task_struct
*, fpu_owner_task
);
1156 #ifdef CONFIG_CC_STACKPROTECTOR
1157 DEFINE_PER_CPU_ALIGNED(struct stack_canary
, stack_canary
);
1160 /* Make sure %fs and %gs are initialized properly in idle threads */
1161 struct pt_regs
* __cpuinit
idle_regs(struct pt_regs
*regs
)
1163 memset(regs
, 0, sizeof(struct pt_regs
));
1164 regs
->fs
= __KERNEL_PERCPU
;
1165 regs
->gs
= __KERNEL_STACK_CANARY
;
1169 #endif /* CONFIG_X86_64 */
1172 * Clear all 6 debug registers:
1174 static void clear_all_debug_regs(void)
1178 for (i
= 0; i
< 8; i
++) {
1179 /* Ignore db4, db5 */
1180 if ((i
== 4) || (i
== 5))
1189 * Restore debug regs if using kgdbwait and you have a kernel debugger
1190 * connection established.
1192 static void dbg_restore_debug_regs(void)
1194 if (unlikely(kgdb_connected
&& arch_kgdb_ops
.correct_hw_break
))
1195 arch_kgdb_ops
.correct_hw_break();
1197 #else /* ! CONFIG_KGDB */
1198 #define dbg_restore_debug_regs()
1199 #endif /* ! CONFIG_KGDB */
1202 * cpu_init() initializes state that is per-CPU. Some data is already
1203 * initialized (naturally) in the bootstrap process, such as the GDT
1204 * and IDT. We reload them nevertheless, this function acts as a
1205 * 'CPU state barrier', nothing should get across.
1206 * A lot of state is already set up in PDA init for 64 bit
1208 #ifdef CONFIG_X86_64
1210 void __cpuinit
cpu_init(void)
1212 struct orig_ist
*oist
;
1213 struct task_struct
*me
;
1214 struct tss_struct
*t
;
1219 cpu
= stack_smp_processor_id();
1220 t
= &per_cpu(init_tss
, cpu
);
1221 oist
= &per_cpu(orig_ist
, cpu
);
1224 if (cpu
!= 0 && this_cpu_read(numa_node
) == 0 &&
1225 early_cpu_to_node(cpu
) != NUMA_NO_NODE
)
1226 set_numa_node(early_cpu_to_node(cpu
));
1231 if (cpumask_test_and_set_cpu(cpu
, cpu_initialized_mask
))
1232 panic("CPU#%d already initialized!\n", cpu
);
1234 pr_debug("Initializing CPU#%d\n", cpu
);
1236 clear_in_cr4(X86_CR4_VME
|X86_CR4_PVI
|X86_CR4_TSD
|X86_CR4_DE
);
1239 * Initialize the per-CPU GDT with the boot GDT,
1240 * and set up the GDT descriptor:
1243 switch_to_new_gdt(cpu
);
1246 load_idt((const struct desc_ptr
*)&idt_descr
);
1248 memset(me
->thread
.tls_array
, 0, GDT_ENTRY_TLS_ENTRIES
* 8);
1251 wrmsrl(MSR_FS_BASE
, 0);
1252 wrmsrl(MSR_KERNEL_GS_BASE
, 0);
1260 * set up and load the per-CPU TSS
1262 if (!oist
->ist
[0]) {
1263 char *estacks
= per_cpu(exception_stacks
, cpu
);
1265 for (v
= 0; v
< N_EXCEPTION_STACKS
; v
++) {
1266 estacks
+= exception_stack_sizes
[v
];
1267 oist
->ist
[v
] = t
->x86_tss
.ist
[v
] =
1268 (unsigned long)estacks
;
1269 if (v
== DEBUG_STACK
-1)
1270 per_cpu(debug_stack_addr
, cpu
) = (unsigned long)estacks
;
1274 t
->x86_tss
.io_bitmap_base
= offsetof(struct tss_struct
, io_bitmap
);
1277 * <= is required because the CPU will access up to
1278 * 8 bits beyond the end of the IO permission bitmap.
1280 for (i
= 0; i
<= IO_BITMAP_LONGS
; i
++)
1281 t
->io_bitmap
[i
] = ~0UL;
1283 atomic_inc(&init_mm
.mm_count
);
1284 me
->active_mm
= &init_mm
;
1286 enter_lazy_tlb(&init_mm
, me
);
1288 load_sp0(t
, ¤t
->thread
);
1289 set_tss_desc(cpu
, t
);
1291 load_LDT(&init_mm
.context
);
1293 clear_all_debug_regs();
1294 dbg_restore_debug_regs();
1299 raw_local_save_flags(kernel_eflags
);
1307 void __cpuinit
cpu_init(void)
1309 int cpu
= smp_processor_id();
1310 struct task_struct
*curr
= current
;
1311 struct tss_struct
*t
= &per_cpu(init_tss
, cpu
);
1312 struct thread_struct
*thread
= &curr
->thread
;
1314 if (cpumask_test_and_set_cpu(cpu
, cpu_initialized_mask
)) {
1315 printk(KERN_WARNING
"CPU#%d already initialized!\n", cpu
);
1320 printk(KERN_INFO
"Initializing CPU#%d\n", cpu
);
1322 if (cpu_has_vme
|| cpu_has_tsc
|| cpu_has_de
)
1323 clear_in_cr4(X86_CR4_VME
|X86_CR4_PVI
|X86_CR4_TSD
|X86_CR4_DE
);
1325 load_idt(&idt_descr
);
1326 switch_to_new_gdt(cpu
);
1329 * Set up and load the per-CPU TSS and LDT
1331 atomic_inc(&init_mm
.mm_count
);
1332 curr
->active_mm
= &init_mm
;
1334 enter_lazy_tlb(&init_mm
, curr
);
1336 load_sp0(t
, thread
);
1337 set_tss_desc(cpu
, t
);
1339 load_LDT(&init_mm
.context
);
1341 t
->x86_tss
.io_bitmap_base
= offsetof(struct tss_struct
, io_bitmap
);
1343 #ifdef CONFIG_DOUBLEFAULT
1344 /* Set up doublefault TSS pointer in the GDT */
1345 __set_tss_desc(cpu
, GDT_ENTRY_DOUBLEFAULT_TSS
, &doublefault_tss
);
1348 clear_all_debug_regs();
1349 dbg_restore_debug_regs();