1 #include <linux/init.h>
2 #include <linux/kernel.h>
3 #include <linux/sched.h>
4 #include <linux/string.h>
5 #include <linux/bootmem.h>
6 #include <linux/bitops.h>
7 #include <linux/module.h>
8 #include <linux/kgdb.h>
9 #include <linux/topology.h>
10 #include <linux/delay.h>
11 #include <linux/smp.h>
12 #include <linux/percpu.h>
16 #include <asm/linkage.h>
17 #include <asm/mmu_context.h>
25 #include <asm/cpumask.h>
26 #ifdef CONFIG_X86_LOCAL_APIC
27 #include <asm/mpspec.h>
29 #include <mach_apic.h>
30 #include <asm/genapic.h>
34 #include <asm/pgtable.h>
35 #include <asm/processor.h>
37 #include <asm/atomic.h>
38 #include <asm/proto.h>
39 #include <asm/sections.h>
40 #include <asm/setup.h>
41 #include <asm/hypervisor.h>
47 /* all of these masks are initialized in setup_cpu_local_masks() */
48 cpumask_var_t cpu_callin_mask
;
49 cpumask_var_t cpu_callout_mask
;
50 cpumask_var_t cpu_initialized_mask
;
52 /* representing cpus for which sibling maps can be computed */
53 cpumask_var_t cpu_sibling_setup_mask
;
55 #else /* CONFIG_X86_32 */
57 cpumask_t cpu_callin_map
;
58 cpumask_t cpu_callout_map
;
59 cpumask_t cpu_initialized
;
60 cpumask_t cpu_sibling_setup_map
;
62 #endif /* CONFIG_X86_32 */
65 static struct cpu_dev
*this_cpu __cpuinitdata
;
68 /* We need valid kernel segments for data and code in long mode too
69 * IRET will check the segment types kkeil 2000/10/28
70 * Also sysret mandates a special GDT layout
72 /* The TLS descriptors are currently at a different place compared to i386.
73 Hopefully nobody expects them at a fixed place (Wine?) */
74 DEFINE_PER_CPU(struct gdt_page
, gdt_page
) = { .gdt
= {
75 [GDT_ENTRY_KERNEL32_CS
] = { { { 0x0000ffff, 0x00cf9b00 } } },
76 [GDT_ENTRY_KERNEL_CS
] = { { { 0x0000ffff, 0x00af9b00 } } },
77 [GDT_ENTRY_KERNEL_DS
] = { { { 0x0000ffff, 0x00cf9300 } } },
78 [GDT_ENTRY_DEFAULT_USER32_CS
] = { { { 0x0000ffff, 0x00cffb00 } } },
79 [GDT_ENTRY_DEFAULT_USER_DS
] = { { { 0x0000ffff, 0x00cff300 } } },
80 [GDT_ENTRY_DEFAULT_USER_CS
] = { { { 0x0000ffff, 0x00affb00 } } },
83 DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page
, gdt_page
) = { .gdt
= {
84 [GDT_ENTRY_KERNEL_CS
] = { { { 0x0000ffff, 0x00cf9a00 } } },
85 [GDT_ENTRY_KERNEL_DS
] = { { { 0x0000ffff, 0x00cf9200 } } },
86 [GDT_ENTRY_DEFAULT_USER_CS
] = { { { 0x0000ffff, 0x00cffa00 } } },
87 [GDT_ENTRY_DEFAULT_USER_DS
] = { { { 0x0000ffff, 0x00cff200 } } },
89 * Segments used for calling PnP BIOS have byte granularity.
90 * They code segments and data segments have fixed 64k limits,
91 * the transfer segment sizes are set at run time.
94 [GDT_ENTRY_PNPBIOS_CS32
] = { { { 0x0000ffff, 0x00409a00 } } },
96 [GDT_ENTRY_PNPBIOS_CS16
] = { { { 0x0000ffff, 0x00009a00 } } },
98 [GDT_ENTRY_PNPBIOS_DS
] = { { { 0x0000ffff, 0x00009200 } } },
100 [GDT_ENTRY_PNPBIOS_TS1
] = { { { 0x00000000, 0x00009200 } } },
102 [GDT_ENTRY_PNPBIOS_TS2
] = { { { 0x00000000, 0x00009200 } } },
104 * The APM segments have byte granularity and their bases
105 * are set at run time. All have 64k limits.
108 [GDT_ENTRY_APMBIOS_BASE
] = { { { 0x0000ffff, 0x00409a00 } } },
110 [GDT_ENTRY_APMBIOS_BASE
+1] = { { { 0x0000ffff, 0x00009a00 } } },
112 [GDT_ENTRY_APMBIOS_BASE
+2] = { { { 0x0000ffff, 0x00409200 } } },
114 [GDT_ENTRY_ESPFIX_SS
] = { { { 0x00000000, 0x00c09200 } } },
115 [GDT_ENTRY_PERCPU
] = { { { 0x00000000, 0x00000000 } } },
118 EXPORT_PER_CPU_SYMBOL_GPL(gdt_page
);
121 static int cachesize_override __cpuinitdata
= -1;
122 static int disable_x86_serial_nr __cpuinitdata
= 1;
124 static int __init
cachesize_setup(char *str
)
126 get_option(&str
, &cachesize_override
);
129 __setup("cachesize=", cachesize_setup
);
131 static int __init
x86_fxsr_setup(char *s
)
133 setup_clear_cpu_cap(X86_FEATURE_FXSR
);
134 setup_clear_cpu_cap(X86_FEATURE_XMM
);
137 __setup("nofxsr", x86_fxsr_setup
);
139 static int __init
x86_sep_setup(char *s
)
141 setup_clear_cpu_cap(X86_FEATURE_SEP
);
144 __setup("nosep", x86_sep_setup
);
146 /* Standard macro to see if a specific flag is changeable */
147 static inline int flag_is_changeable_p(u32 flag
)
152 * Cyrix and IDT cpus allow disabling of CPUID
153 * so the code below may return different results
154 * when it is executed before and after enabling
155 * the CPUID. Add "volatile" to not allow gcc to
156 * optimize the subsequent calls to this function.
158 asm volatile ("pushfl\n\t"
168 : "=&r" (f1
), "=&r" (f2
)
171 return ((f1
^f2
) & flag
) != 0;
174 /* Probe for the CPUID instruction */
175 static int __cpuinit
have_cpuid_p(void)
177 return flag_is_changeable_p(X86_EFLAGS_ID
);
180 static void __cpuinit
squash_the_stupid_serial_number(struct cpuinfo_x86
*c
)
182 if (cpu_has(c
, X86_FEATURE_PN
) && disable_x86_serial_nr
) {
183 /* Disable processor serial number */
184 unsigned long lo
, hi
;
185 rdmsr(MSR_IA32_BBL_CR_CTL
, lo
, hi
);
187 wrmsr(MSR_IA32_BBL_CR_CTL
, lo
, hi
);
188 printk(KERN_NOTICE
"CPU serial number disabled.\n");
189 clear_cpu_cap(c
, X86_FEATURE_PN
);
191 /* Disabling the serial number may affect the cpuid level */
192 c
->cpuid_level
= cpuid_eax(0);
196 static int __init
x86_serial_nr_setup(char *s
)
198 disable_x86_serial_nr
= 0;
201 __setup("serialnumber", x86_serial_nr_setup
);
203 static inline int flag_is_changeable_p(u32 flag
)
207 /* Probe for the CPUID instruction */
208 static inline int have_cpuid_p(void)
212 static inline void squash_the_stupid_serial_number(struct cpuinfo_x86
*c
)
218 * Naming convention should be: <Name> [(<Codename>)]
219 * This table only is used unless init_<vendor>() below doesn't set it;
220 * in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
224 /* Look up CPU names by table lookup. */
225 static char __cpuinit
*table_lookup_model(struct cpuinfo_x86
*c
)
227 struct cpu_model_info
*info
;
229 if (c
->x86_model
>= 16)
230 return NULL
; /* Range check */
235 info
= this_cpu
->c_models
;
237 while (info
&& info
->family
) {
238 if (info
->family
== c
->x86
)
239 return info
->model_names
[c
->x86_model
];
242 return NULL
; /* Not found */
245 __u32 cleared_cpu_caps
[NCAPINTS
] __cpuinitdata
;
247 /* Current gdt points %fs at the "master" per-cpu area: after this,
248 * it's on the real one. */
249 void switch_to_new_gdt(void)
251 struct desc_ptr gdt_descr
;
253 gdt_descr
.address
= (long)get_cpu_gdt_table(smp_processor_id());
254 gdt_descr
.size
= GDT_SIZE
- 1;
255 load_gdt(&gdt_descr
);
257 asm("mov %0, %%fs" : : "r" (__KERNEL_PERCPU
) : "memory");
261 static struct cpu_dev
*cpu_devs
[X86_VENDOR_NUM
] = {};
263 static void __cpuinit
default_init(struct cpuinfo_x86
*c
)
266 display_cacheinfo(c
);
268 /* Not much we can do here... */
269 /* Check if at least it has cpuid */
270 if (c
->cpuid_level
== -1) {
271 /* No cpuid. It must be an ancient CPU */
273 strcpy(c
->x86_model_id
, "486");
274 else if (c
->x86
== 3)
275 strcpy(c
->x86_model_id
, "386");
280 static struct cpu_dev __cpuinitdata default_cpu
= {
281 .c_init
= default_init
,
282 .c_vendor
= "Unknown",
283 .c_x86_vendor
= X86_VENDOR_UNKNOWN
,
286 static void __cpuinit
get_model_name(struct cpuinfo_x86
*c
)
291 if (c
->extended_cpuid_level
< 0x80000004)
294 v
= (unsigned int *) c
->x86_model_id
;
295 cpuid(0x80000002, &v
[0], &v
[1], &v
[2], &v
[3]);
296 cpuid(0x80000003, &v
[4], &v
[5], &v
[6], &v
[7]);
297 cpuid(0x80000004, &v
[8], &v
[9], &v
[10], &v
[11]);
298 c
->x86_model_id
[48] = 0;
300 /* Intel chips right-justify this string for some dumb reason;
301 undo that brain damage */
302 p
= q
= &c
->x86_model_id
[0];
308 while (q
<= &c
->x86_model_id
[48])
309 *q
++ = '\0'; /* Zero-pad the rest */
313 void __cpuinit
display_cacheinfo(struct cpuinfo_x86
*c
)
315 unsigned int n
, dummy
, ebx
, ecx
, edx
, l2size
;
317 n
= c
->extended_cpuid_level
;
319 if (n
>= 0x80000005) {
320 cpuid(0x80000005, &dummy
, &ebx
, &ecx
, &edx
);
321 printk(KERN_INFO
"CPU: L1 I Cache: %dK (%d bytes/line), D cache %dK (%d bytes/line)\n",
322 edx
>>24, edx
&0xFF, ecx
>>24, ecx
&0xFF);
323 c
->x86_cache_size
= (ecx
>>24) + (edx
>>24);
325 /* On K8 L1 TLB is inclusive, so don't count it */
330 if (n
< 0x80000006) /* Some chips just has a large L1. */
333 cpuid(0x80000006, &dummy
, &ebx
, &ecx
, &edx
);
337 c
->x86_tlbsize
+= ((ebx
>> 16) & 0xfff) + (ebx
& 0xfff);
339 /* do processor-specific cache resizing */
340 if (this_cpu
->c_size_cache
)
341 l2size
= this_cpu
->c_size_cache(c
, l2size
);
343 /* Allow user to override all this if necessary. */
344 if (cachesize_override
!= -1)
345 l2size
= cachesize_override
;
348 return; /* Again, no L2 cache is possible */
351 c
->x86_cache_size
= l2size
;
353 printk(KERN_INFO
"CPU: L2 Cache: %dK (%d bytes/line)\n",
357 void __cpuinit
detect_ht(struct cpuinfo_x86
*c
)
360 u32 eax
, ebx
, ecx
, edx
;
361 int index_msb
, core_bits
;
363 if (!cpu_has(c
, X86_FEATURE_HT
))
366 if (cpu_has(c
, X86_FEATURE_CMP_LEGACY
))
369 if (cpu_has(c
, X86_FEATURE_XTOPOLOGY
))
372 cpuid(1, &eax
, &ebx
, &ecx
, &edx
);
374 smp_num_siblings
= (ebx
& 0xff0000) >> 16;
376 if (smp_num_siblings
== 1) {
377 printk(KERN_INFO
"CPU: Hyper-Threading is disabled\n");
378 } else if (smp_num_siblings
> 1) {
380 if (smp_num_siblings
> nr_cpu_ids
) {
381 printk(KERN_WARNING
"CPU: Unsupported number of siblings %d",
383 smp_num_siblings
= 1;
387 index_msb
= get_count_order(smp_num_siblings
);
389 c
->phys_proc_id
= phys_pkg_id(index_msb
);
391 c
->phys_proc_id
= phys_pkg_id(c
->initial_apicid
, index_msb
);
394 smp_num_siblings
= smp_num_siblings
/ c
->x86_max_cores
;
396 index_msb
= get_count_order(smp_num_siblings
);
398 core_bits
= get_count_order(c
->x86_max_cores
);
401 c
->cpu_core_id
= phys_pkg_id(index_msb
) &
402 ((1 << core_bits
) - 1);
404 c
->cpu_core_id
= phys_pkg_id(c
->initial_apicid
, index_msb
) &
405 ((1 << core_bits
) - 1);
410 if ((c
->x86_max_cores
* smp_num_siblings
) > 1) {
411 printk(KERN_INFO
"CPU: Physical Processor ID: %d\n",
413 printk(KERN_INFO
"CPU: Processor Core ID: %d\n",
419 static void __cpuinit
get_cpu_vendor(struct cpuinfo_x86
*c
)
421 char *v
= c
->x86_vendor_id
;
425 for (i
= 0; i
< X86_VENDOR_NUM
; i
++) {
429 if (!strcmp(v
, cpu_devs
[i
]->c_ident
[0]) ||
430 (cpu_devs
[i
]->c_ident
[1] &&
431 !strcmp(v
, cpu_devs
[i
]->c_ident
[1]))) {
432 this_cpu
= cpu_devs
[i
];
433 c
->x86_vendor
= this_cpu
->c_x86_vendor
;
440 printk(KERN_ERR
"CPU: vendor_id '%s' unknown, using generic init.\n", v
);
441 printk(KERN_ERR
"CPU: Your system may be unstable.\n");
444 c
->x86_vendor
= X86_VENDOR_UNKNOWN
;
445 this_cpu
= &default_cpu
;
448 void __cpuinit
cpu_detect(struct cpuinfo_x86
*c
)
450 /* Get vendor name */
451 cpuid(0x00000000, (unsigned int *)&c
->cpuid_level
,
452 (unsigned int *)&c
->x86_vendor_id
[0],
453 (unsigned int *)&c
->x86_vendor_id
[8],
454 (unsigned int *)&c
->x86_vendor_id
[4]);
457 /* Intel-defined flags: level 0x00000001 */
458 if (c
->cpuid_level
>= 0x00000001) {
459 u32 junk
, tfms
, cap0
, misc
;
460 cpuid(0x00000001, &tfms
, &misc
, &junk
, &cap0
);
461 c
->x86
= (tfms
>> 8) & 0xf;
462 c
->x86_model
= (tfms
>> 4) & 0xf;
463 c
->x86_mask
= tfms
& 0xf;
465 c
->x86
+= (tfms
>> 20) & 0xff;
467 c
->x86_model
+= ((tfms
>> 16) & 0xf) << 4;
468 if (cap0
& (1<<19)) {
469 c
->x86_clflush_size
= ((misc
>> 8) & 0xff) * 8;
470 c
->x86_cache_alignment
= c
->x86_clflush_size
;
475 static void __cpuinit
get_cpu_cap(struct cpuinfo_x86
*c
)
480 /* Intel-defined flags: level 0x00000001 */
481 if (c
->cpuid_level
>= 0x00000001) {
482 u32 capability
, excap
;
483 cpuid(0x00000001, &tfms
, &ebx
, &excap
, &capability
);
484 c
->x86_capability
[0] = capability
;
485 c
->x86_capability
[4] = excap
;
488 /* AMD-defined flags: level 0x80000001 */
489 xlvl
= cpuid_eax(0x80000000);
490 c
->extended_cpuid_level
= xlvl
;
491 if ((xlvl
& 0xffff0000) == 0x80000000) {
492 if (xlvl
>= 0x80000001) {
493 c
->x86_capability
[1] = cpuid_edx(0x80000001);
494 c
->x86_capability
[6] = cpuid_ecx(0x80000001);
499 if (c
->extended_cpuid_level
>= 0x80000008) {
500 u32 eax
= cpuid_eax(0x80000008);
502 c
->x86_virt_bits
= (eax
>> 8) & 0xff;
503 c
->x86_phys_bits
= eax
& 0xff;
507 if (c
->extended_cpuid_level
>= 0x80000007)
508 c
->x86_power
= cpuid_edx(0x80000007);
512 static void __cpuinit
identify_cpu_without_cpuid(struct cpuinfo_x86
*c
)
518 * First of all, decide if this is a 486 or higher
519 * It's a 486 if we can modify the AC flag
521 if (flag_is_changeable_p(X86_EFLAGS_AC
))
526 for (i
= 0; i
< X86_VENDOR_NUM
; i
++)
527 if (cpu_devs
[i
] && cpu_devs
[i
]->c_identify
) {
528 c
->x86_vendor_id
[0] = 0;
529 cpu_devs
[i
]->c_identify(c
);
530 if (c
->x86_vendor_id
[0]) {
539 * Do minimum CPU detection early.
540 * Fields really needed: vendor, cpuid_level, family, model, mask,
542 * The others are not touched to avoid unwanted side effects.
544 * WARNING: this function is only called on the BP. Don't add code here
545 * that is supposed to run on all CPUs.
547 static void __init
early_identify_cpu(struct cpuinfo_x86
*c
)
550 c
->x86_clflush_size
= 64;
552 c
->x86_clflush_size
= 32;
554 c
->x86_cache_alignment
= c
->x86_clflush_size
;
556 memset(&c
->x86_capability
, 0, sizeof c
->x86_capability
);
557 c
->extended_cpuid_level
= 0;
560 identify_cpu_without_cpuid(c
);
562 /* cyrix could have cpuid enabled via c_identify()*/
572 if (this_cpu
->c_early_init
)
573 this_cpu
->c_early_init(c
);
575 validate_pat_support(c
);
578 c
->cpu_index
= boot_cpu_id
;
582 void __init
early_cpu_init(void)
584 struct cpu_dev
**cdev
;
587 printk("KERNEL supported cpus:\n");
588 for (cdev
= __x86_cpu_dev_start
; cdev
< __x86_cpu_dev_end
; cdev
++) {
589 struct cpu_dev
*cpudev
= *cdev
;
592 if (count
>= X86_VENDOR_NUM
)
594 cpu_devs
[count
] = cpudev
;
597 for (j
= 0; j
< 2; j
++) {
598 if (!cpudev
->c_ident
[j
])
600 printk(" %s %s\n", cpudev
->c_vendor
,
605 early_identify_cpu(&boot_cpu_data
);
609 * The NOPL instruction is supposed to exist on all CPUs with
610 * family >= 6; unfortunately, that's not true in practice because
611 * of early VIA chips and (more importantly) broken virtualizers that
612 * are not easy to detect. In the latter case it doesn't even *fail*
613 * reliably, so probing for it doesn't even work. Disable it completely
614 * unless we can find a reliable way to detect all the broken cases.
616 static void __cpuinit
detect_nopl(struct cpuinfo_x86
*c
)
618 clear_cpu_cap(c
, X86_FEATURE_NOPL
);
621 static void __cpuinit
generic_identify(struct cpuinfo_x86
*c
)
623 c
->extended_cpuid_level
= 0;
626 identify_cpu_without_cpuid(c
);
628 /* cyrix could have cpuid enabled via c_identify()*/
638 if (c
->cpuid_level
>= 0x00000001) {
639 c
->initial_apicid
= (cpuid_ebx(1) >> 24) & 0xFF;
641 # ifdef CONFIG_X86_HT
642 c
->apicid
= phys_pkg_id(c
->initial_apicid
, 0);
644 c
->apicid
= c
->initial_apicid
;
649 c
->phys_proc_id
= c
->initial_apicid
;
653 get_model_name(c
); /* Default name */
655 init_scattered_cpuid_features(c
);
660 * This does the hard work of actually picking apart the CPU stuff...
662 static void __cpuinit
identify_cpu(struct cpuinfo_x86
*c
)
666 c
->loops_per_jiffy
= loops_per_jiffy
;
667 c
->x86_cache_size
= -1;
668 c
->x86_vendor
= X86_VENDOR_UNKNOWN
;
669 c
->x86_model
= c
->x86_mask
= 0; /* So far unknown... */
670 c
->x86_vendor_id
[0] = '\0'; /* Unset */
671 c
->x86_model_id
[0] = '\0'; /* Unset */
672 c
->x86_max_cores
= 1;
673 c
->x86_coreid_bits
= 0;
675 c
->x86_clflush_size
= 64;
677 c
->cpuid_level
= -1; /* CPUID not detected */
678 c
->x86_clflush_size
= 32;
680 c
->x86_cache_alignment
= c
->x86_clflush_size
;
681 memset(&c
->x86_capability
, 0, sizeof c
->x86_capability
);
685 if (this_cpu
->c_identify
)
686 this_cpu
->c_identify(c
);
689 c
->apicid
= phys_pkg_id(0);
693 * Vendor-specific initialization. In this section we
694 * canonicalize the feature flags, meaning if there are
695 * features a certain CPU supports which CPUID doesn't
696 * tell us, CPUID claiming incorrect flags, or other bugs,
697 * we handle them here.
699 * At the end of this section, c->x86_capability better
700 * indicate the features this CPU genuinely supports!
702 if (this_cpu
->c_init
)
705 /* Disable the PN if appropriate */
706 squash_the_stupid_serial_number(c
);
709 * The vendor-specific functions might have changed features. Now
710 * we do "generic changes."
713 /* If the model name is still unset, do table lookup. */
714 if (!c
->x86_model_id
[0]) {
716 p
= table_lookup_model(c
);
718 strcpy(c
->x86_model_id
, p
);
721 sprintf(c
->x86_model_id
, "%02x/%02x",
722 c
->x86
, c
->x86_model
);
731 * On SMP, boot_cpu_data holds the common feature set between
732 * all CPUs; so make sure that we indicate which features are
733 * common between the CPUs. The first time this routine gets
734 * executed, c == &boot_cpu_data.
736 if (c
!= &boot_cpu_data
) {
737 /* AND the already accumulated flags with these */
738 for (i
= 0; i
< NCAPINTS
; i
++)
739 boot_cpu_data
.x86_capability
[i
] &= c
->x86_capability
[i
];
742 /* Clear all flags overriden by options */
743 for (i
= 0; i
< NCAPINTS
; i
++)
744 c
->x86_capability
[i
] &= ~cleared_cpu_caps
[i
];
746 #ifdef CONFIG_X86_MCE
747 /* Init Machine Check Exception if available. */
751 select_idle_routine(c
);
753 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
754 numa_add_cpu(smp_processor_id());
759 static void vgetcpu_set_mode(void)
761 if (cpu_has(&boot_cpu_data
, X86_FEATURE_RDTSCP
))
762 vgetcpu_mode
= VGETCPU_RDTSCP
;
764 vgetcpu_mode
= VGETCPU_LSL
;
768 void __init
identify_boot_cpu(void)
770 identify_cpu(&boot_cpu_data
);
779 void __cpuinit
identify_secondary_cpu(struct cpuinfo_x86
*c
)
781 BUG_ON(c
== &boot_cpu_data
);
794 static struct msr_range msr_range_array
[] __cpuinitdata
= {
795 { 0x00000000, 0x00000418},
796 { 0xc0000000, 0xc000040b},
797 { 0xc0010000, 0xc0010142},
798 { 0xc0011000, 0xc001103b},
801 static void __cpuinit
print_cpu_msr(void)
806 unsigned index_min
, index_max
;
808 for (i
= 0; i
< ARRAY_SIZE(msr_range_array
); i
++) {
809 index_min
= msr_range_array
[i
].min
;
810 index_max
= msr_range_array
[i
].max
;
811 for (index
= index_min
; index
< index_max
; index
++) {
812 if (rdmsrl_amd_safe(index
, &val
))
814 printk(KERN_INFO
" MSR%08x: %016llx\n", index
, val
);
819 static int show_msr __cpuinitdata
;
820 static __init
int setup_show_msr(char *arg
)
824 get_option(&arg
, &num
);
830 __setup("show_msr=", setup_show_msr
);
832 static __init
int setup_noclflush(char *arg
)
834 setup_clear_cpu_cap(X86_FEATURE_CLFLSH
);
837 __setup("noclflush", setup_noclflush
);
839 void __cpuinit
print_cpu_info(struct cpuinfo_x86
*c
)
843 if (c
->x86_vendor
< X86_VENDOR_NUM
)
844 vendor
= this_cpu
->c_vendor
;
845 else if (c
->cpuid_level
>= 0)
846 vendor
= c
->x86_vendor_id
;
848 if (vendor
&& !strstr(c
->x86_model_id
, vendor
))
849 printk(KERN_CONT
"%s ", vendor
);
851 if (c
->x86_model_id
[0])
852 printk(KERN_CONT
"%s", c
->x86_model_id
);
854 printk(KERN_CONT
"%d86", c
->x86
);
856 if (c
->x86_mask
|| c
->cpuid_level
>= 0)
857 printk(KERN_CONT
" stepping %02x\n", c
->x86_mask
);
859 printk(KERN_CONT
"\n");
862 if (c
->cpu_index
< show_msr
)
870 static __init
int setup_disablecpuid(char *arg
)
873 if (get_option(&arg
, &bit
) && bit
< NCAPINTS
*32)
874 setup_clear_cpu_cap(bit
);
879 __setup("clearcpuid=", setup_disablecpuid
);
882 struct x8664_pda
**_cpu_pda __read_mostly
;
883 EXPORT_SYMBOL(_cpu_pda
);
885 struct desc_ptr idt_descr
= { 256 * 16 - 1, (unsigned long) idt_table
};
887 static char boot_cpu_stack
[IRQSTACKSIZE
] __page_aligned_bss
;
889 void __cpuinit
pda_init(int cpu
)
891 struct x8664_pda
*pda
= cpu_pda(cpu
);
893 /* Setup up data that may be needed in __get_free_pages early */
896 /* Memory clobbers used to order PDA accessed */
898 wrmsrl(MSR_GS_BASE
, pda
);
901 pda
->cpunumber
= cpu
;
903 pda
->kernelstack
= (unsigned long)stack_thread_info() -
904 PDA_STACKOFFSET
+ THREAD_SIZE
;
905 pda
->active_mm
= &init_mm
;
909 /* others are initialized in smpboot.c */
910 pda
->pcurrent
= &init_task
;
911 pda
->irqstackptr
= boot_cpu_stack
;
912 pda
->irqstackptr
+= IRQSTACKSIZE
- 64;
914 if (!pda
->irqstackptr
) {
915 pda
->irqstackptr
= (char *)
916 __get_free_pages(GFP_ATOMIC
, IRQSTACK_ORDER
);
917 if (!pda
->irqstackptr
)
918 panic("cannot allocate irqstack for cpu %d",
920 pda
->irqstackptr
+= IRQSTACKSIZE
- 64;
923 if (pda
->nodenumber
== 0 && cpu_to_node(cpu
) != NUMA_NO_NODE
)
924 pda
->nodenumber
= cpu_to_node(cpu
);
928 static char boot_exception_stacks
[(N_EXCEPTION_STACKS
- 1) * EXCEPTION_STKSZ
+
929 DEBUG_STKSZ
] __page_aligned_bss
;
931 extern asmlinkage
void ignore_sysret(void);
933 /* May not be marked __init: used by software suspend */
934 void syscall_init(void)
937 * LSTAR and STAR live in a bit strange symbiosis.
938 * They both write to the same internal register. STAR allows to
939 * set CS/DS but only a 32bit target. LSTAR sets the 64bit rip.
941 wrmsrl(MSR_STAR
, ((u64
)__USER32_CS
)<<48 | ((u64
)__KERNEL_CS
)<<32);
942 wrmsrl(MSR_LSTAR
, system_call
);
943 wrmsrl(MSR_CSTAR
, ignore_sysret
);
945 #ifdef CONFIG_IA32_EMULATION
946 syscall32_cpu_init();
949 /* Flags to clear on syscall */
950 wrmsrl(MSR_SYSCALL_MASK
,
951 X86_EFLAGS_TF
|X86_EFLAGS_DF
|X86_EFLAGS_IF
|X86_EFLAGS_IOPL
);
954 unsigned long kernel_eflags
;
957 * Copies of the original ist values from the tss are only accessed during
958 * debugging, no special alignment required.
960 DEFINE_PER_CPU(struct orig_ist
, orig_ist
);
964 /* Make sure %fs is initialized properly in idle threads */
965 struct pt_regs
* __cpuinit
idle_regs(struct pt_regs
*regs
)
967 memset(regs
, 0, sizeof(struct pt_regs
));
968 regs
->fs
= __KERNEL_PERCPU
;
974 * cpu_init() initializes state that is per-CPU. Some data is already
975 * initialized (naturally) in the bootstrap process, such as the GDT
976 * and IDT. We reload them nevertheless, this function acts as a
977 * 'CPU state barrier', nothing should get across.
978 * A lot of state is already set up in PDA init for 64 bit
981 void __cpuinit
cpu_init(void)
983 int cpu
= stack_smp_processor_id();
984 struct tss_struct
*t
= &per_cpu(init_tss
, cpu
);
985 struct orig_ist
*orig_ist
= &per_cpu(orig_ist
, cpu
);
987 char *estacks
= NULL
;
988 struct task_struct
*me
;
991 /* CPU 0 is initialised in head64.c */
995 estacks
= boot_exception_stacks
;
999 if (cpumask_test_and_set_cpu(cpu
, cpu_initialized_mask
))
1000 panic("CPU#%d already initialized!\n", cpu
);
1002 printk(KERN_INFO
"Initializing CPU#%d\n", cpu
);
1004 clear_in_cr4(X86_CR4_VME
|X86_CR4_PVI
|X86_CR4_TSD
|X86_CR4_DE
);
1007 * Initialize the per-CPU GDT with the boot GDT,
1008 * and set up the GDT descriptor:
1011 switch_to_new_gdt();
1012 load_idt((const struct desc_ptr
*)&idt_descr
);
1014 memset(me
->thread
.tls_array
, 0, GDT_ENTRY_TLS_ENTRIES
* 8);
1017 wrmsrl(MSR_FS_BASE
, 0);
1018 wrmsrl(MSR_KERNEL_GS_BASE
, 0);
1022 if (cpu
!= 0 && x2apic
)
1026 * set up and load the per-CPU TSS
1028 if (!orig_ist
->ist
[0]) {
1029 static const unsigned int order
[N_EXCEPTION_STACKS
] = {
1030 [0 ... N_EXCEPTION_STACKS
- 1] = EXCEPTION_STACK_ORDER
,
1031 [DEBUG_STACK
- 1] = DEBUG_STACK_ORDER
1033 for (v
= 0; v
< N_EXCEPTION_STACKS
; v
++) {
1035 estacks
= (char *)__get_free_pages(GFP_ATOMIC
, order
[v
]);
1037 panic("Cannot allocate exception "
1038 "stack %ld %d\n", v
, cpu
);
1040 estacks
+= PAGE_SIZE
<< order
[v
];
1041 orig_ist
->ist
[v
] = t
->x86_tss
.ist
[v
] =
1042 (unsigned long)estacks
;
1046 t
->x86_tss
.io_bitmap_base
= offsetof(struct tss_struct
, io_bitmap
);
1048 * <= is required because the CPU will access up to
1049 * 8 bits beyond the end of the IO permission bitmap.
1051 for (i
= 0; i
<= IO_BITMAP_LONGS
; i
++)
1052 t
->io_bitmap
[i
] = ~0UL;
1054 atomic_inc(&init_mm
.mm_count
);
1055 me
->active_mm
= &init_mm
;
1058 enter_lazy_tlb(&init_mm
, me
);
1060 load_sp0(t
, ¤t
->thread
);
1061 set_tss_desc(cpu
, t
);
1063 load_LDT(&init_mm
.context
);
1067 * If the kgdb is connected no debug regs should be altered. This
1068 * is only applicable when KGDB and a KGDB I/O module are built
1069 * into the kernel and you are using early debugging with
1070 * kgdbwait. KGDB will control the kernel HW breakpoint registers.
1072 if (kgdb_connected
&& arch_kgdb_ops
.correct_hw_break
)
1073 arch_kgdb_ops
.correct_hw_break();
1078 * Clear all 6 debug registers:
1080 set_debugreg(0UL, 0);
1081 set_debugreg(0UL, 1);
1082 set_debugreg(0UL, 2);
1083 set_debugreg(0UL, 3);
1084 set_debugreg(0UL, 6);
1085 set_debugreg(0UL, 7);
1090 raw_local_save_flags(kernel_eflags
);
1098 void __cpuinit
cpu_init(void)
1100 int cpu
= smp_processor_id();
1101 struct task_struct
*curr
= current
;
1102 struct tss_struct
*t
= &per_cpu(init_tss
, cpu
);
1103 struct thread_struct
*thread
= &curr
->thread
;
1105 if (cpumask_test_and_set_cpu(cpu
, cpu_initialized_mask
)) {
1106 printk(KERN_WARNING
"CPU#%d already initialized!\n", cpu
);
1107 for (;;) local_irq_enable();
1110 printk(KERN_INFO
"Initializing CPU#%d\n", cpu
);
1112 if (cpu_has_vme
|| cpu_has_tsc
|| cpu_has_de
)
1113 clear_in_cr4(X86_CR4_VME
|X86_CR4_PVI
|X86_CR4_TSD
|X86_CR4_DE
);
1115 load_idt(&idt_descr
);
1116 switch_to_new_gdt();
1119 * Set up and load the per-CPU TSS and LDT
1121 atomic_inc(&init_mm
.mm_count
);
1122 curr
->active_mm
= &init_mm
;
1125 enter_lazy_tlb(&init_mm
, curr
);
1127 load_sp0(t
, thread
);
1128 set_tss_desc(cpu
, t
);
1130 load_LDT(&init_mm
.context
);
1132 #ifdef CONFIG_DOUBLEFAULT
1133 /* Set up doublefault TSS pointer in the GDT */
1134 __set_tss_desc(cpu
, GDT_ENTRY_DOUBLEFAULT_TSS
, &doublefault_tss
);
1138 asm volatile ("mov %0, %%gs" : : "r" (0));
1140 /* Clear all 6 debug registers: */
1149 * Force FPU initialization:
1152 current_thread_info()->status
= TS_XSAVE
;
1154 current_thread_info()->status
= 0;
1156 mxcsr_feature_mask_init();
1159 * Boot processor to setup the FP and extended state context info.
1161 if (smp_processor_id() == boot_cpu_id
)
1162 init_thread_xstate();