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Commit | Line | Data |
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f0fc4aff | 1 | #include <linux/bootmem.h> |
9766cdbc | 2 | #include <linux/linkage.h> |
f0fc4aff | 3 | #include <linux/bitops.h> |
9766cdbc | 4 | #include <linux/kernel.h> |
f0fc4aff | 5 | #include <linux/module.h> |
9766cdbc JSR |
6 | #include <linux/percpu.h> |
7 | #include <linux/string.h> | |
1da177e4 | 8 | #include <linux/delay.h> |
9766cdbc JSR |
9 | #include <linux/sched.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/kgdb.h> | |
1da177e4 | 12 | #include <linux/smp.h> |
9766cdbc JSR |
13 | #include <linux/io.h> |
14 | ||
15 | #include <asm/stackprotector.h> | |
cdd6c482 | 16 | #include <asm/perf_event.h> |
1da177e4 | 17 | #include <asm/mmu_context.h> |
9766cdbc JSR |
18 | #include <asm/hypervisor.h> |
19 | #include <asm/processor.h> | |
20 | #include <asm/sections.h> | |
8bdbd962 AC |
21 | #include <linux/topology.h> |
22 | #include <linux/cpumask.h> | |
9766cdbc JSR |
23 | #include <asm/pgtable.h> |
24 | #include <asm/atomic.h> | |
25 | #include <asm/proto.h> | |
26 | #include <asm/setup.h> | |
27 | #include <asm/apic.h> | |
28 | #include <asm/desc.h> | |
29 | #include <asm/i387.h> | |
27b07da7 | 30 | #include <asm/mtrr.h> |
8bdbd962 | 31 | #include <linux/numa.h> |
9766cdbc JSR |
32 | #include <asm/asm.h> |
33 | #include <asm/cpu.h> | |
a03a3e28 | 34 | #include <asm/mce.h> |
9766cdbc | 35 | #include <asm/msr.h> |
8d4a4300 | 36 | #include <asm/pat.h> |
e641f5f5 IM |
37 | |
38 | #ifdef CONFIG_X86_LOCAL_APIC | |
bdbcdd48 | 39 | #include <asm/uv/uv.h> |
1da177e4 LT |
40 | #endif |
41 | ||
42 | #include "cpu.h" | |
43 | ||
c2d1cec1 | 44 | /* all of these masks are initialized in setup_cpu_local_masks() */ |
c2d1cec1 | 45 | cpumask_var_t cpu_initialized_mask; |
9766cdbc JSR |
46 | cpumask_var_t cpu_callout_mask; |
47 | cpumask_var_t cpu_callin_mask; | |
c2d1cec1 MT |
48 | |
49 | /* representing cpus for which sibling maps can be computed */ | |
50 | cpumask_var_t cpu_sibling_setup_mask; | |
51 | ||
2f2f52ba | 52 | /* correctly size the local cpu masks */ |
4369f1fb | 53 | void __init setup_cpu_local_masks(void) |
2f2f52ba BG |
54 | { |
55 | alloc_bootmem_cpumask_var(&cpu_initialized_mask); | |
56 | alloc_bootmem_cpumask_var(&cpu_callin_mask); | |
57 | alloc_bootmem_cpumask_var(&cpu_callout_mask); | |
58 | alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask); | |
59 | } | |
60 | ||
e8055139 OZ |
61 | static void __cpuinit default_init(struct cpuinfo_x86 *c) |
62 | { | |
63 | #ifdef CONFIG_X86_64 | |
27c13ece | 64 | cpu_detect_cache_sizes(c); |
e8055139 OZ |
65 | #else |
66 | /* Not much we can do here... */ | |
67 | /* Check if at least it has cpuid */ | |
68 | if (c->cpuid_level == -1) { | |
69 | /* No cpuid. It must be an ancient CPU */ | |
70 | if (c->x86 == 4) | |
71 | strcpy(c->x86_model_id, "486"); | |
72 | else if (c->x86 == 3) | |
73 | strcpy(c->x86_model_id, "386"); | |
74 | } | |
75 | #endif | |
76 | } | |
77 | ||
78 | static const struct cpu_dev __cpuinitconst default_cpu = { | |
79 | .c_init = default_init, | |
80 | .c_vendor = "Unknown", | |
81 | .c_x86_vendor = X86_VENDOR_UNKNOWN, | |
82 | }; | |
83 | ||
84 | static const struct cpu_dev *this_cpu __cpuinitdata = &default_cpu; | |
0a488a53 | 85 | |
06deef89 | 86 | DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = { |
950ad7ff | 87 | #ifdef CONFIG_X86_64 |
06deef89 BG |
88 | /* |
89 | * We need valid kernel segments for data and code in long mode too | |
90 | * IRET will check the segment types kkeil 2000/10/28 | |
91 | * Also sysret mandates a special GDT layout | |
92 | * | |
9766cdbc | 93 | * TLS descriptors are currently at a different place compared to i386. |
06deef89 BG |
94 | * Hopefully nobody expects them at a fixed place (Wine?) |
95 | */ | |
1e5de182 AM |
96 | [GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff), |
97 | [GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff), | |
98 | [GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc093, 0, 0xfffff), | |
99 | [GDT_ENTRY_DEFAULT_USER32_CS] = GDT_ENTRY_INIT(0xc0fb, 0, 0xfffff), | |
100 | [GDT_ENTRY_DEFAULT_USER_DS] = GDT_ENTRY_INIT(0xc0f3, 0, 0xfffff), | |
101 | [GDT_ENTRY_DEFAULT_USER_CS] = GDT_ENTRY_INIT(0xa0fb, 0, 0xfffff), | |
950ad7ff | 102 | #else |
1e5de182 AM |
103 | [GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xc09a, 0, 0xfffff), |
104 | [GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff), | |
105 | [GDT_ENTRY_DEFAULT_USER_CS] = GDT_ENTRY_INIT(0xc0fa, 0, 0xfffff), | |
106 | [GDT_ENTRY_DEFAULT_USER_DS] = GDT_ENTRY_INIT(0xc0f2, 0, 0xfffff), | |
bf504672 RR |
107 | /* |
108 | * Segments used for calling PnP BIOS have byte granularity. | |
109 | * They code segments and data segments have fixed 64k limits, | |
110 | * the transfer segment sizes are set at run time. | |
111 | */ | |
6842ef0e | 112 | /* 32-bit code */ |
1e5de182 | 113 | [GDT_ENTRY_PNPBIOS_CS32] = GDT_ENTRY_INIT(0x409a, 0, 0xffff), |
6842ef0e | 114 | /* 16-bit code */ |
1e5de182 | 115 | [GDT_ENTRY_PNPBIOS_CS16] = GDT_ENTRY_INIT(0x009a, 0, 0xffff), |
6842ef0e | 116 | /* 16-bit data */ |
1e5de182 | 117 | [GDT_ENTRY_PNPBIOS_DS] = GDT_ENTRY_INIT(0x0092, 0, 0xffff), |
6842ef0e | 118 | /* 16-bit data */ |
1e5de182 | 119 | [GDT_ENTRY_PNPBIOS_TS1] = GDT_ENTRY_INIT(0x0092, 0, 0), |
6842ef0e | 120 | /* 16-bit data */ |
1e5de182 | 121 | [GDT_ENTRY_PNPBIOS_TS2] = GDT_ENTRY_INIT(0x0092, 0, 0), |
bf504672 RR |
122 | /* |
123 | * The APM segments have byte granularity and their bases | |
124 | * are set at run time. All have 64k limits. | |
125 | */ | |
6842ef0e | 126 | /* 32-bit code */ |
1e5de182 | 127 | [GDT_ENTRY_APMBIOS_BASE] = GDT_ENTRY_INIT(0x409a, 0, 0xffff), |
bf504672 | 128 | /* 16-bit code */ |
1e5de182 | 129 | [GDT_ENTRY_APMBIOS_BASE+1] = GDT_ENTRY_INIT(0x009a, 0, 0xffff), |
6842ef0e | 130 | /* data */ |
72c4d853 | 131 | [GDT_ENTRY_APMBIOS_BASE+2] = GDT_ENTRY_INIT(0x4092, 0, 0xffff), |
bf504672 | 132 | |
1e5de182 AM |
133 | [GDT_ENTRY_ESPFIX_SS] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff), |
134 | [GDT_ENTRY_PERCPU] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff), | |
60a5317f | 135 | GDT_STACK_CANARY_INIT |
950ad7ff | 136 | #endif |
06deef89 | 137 | } }; |
7a61d35d | 138 | EXPORT_PER_CPU_SYMBOL_GPL(gdt_page); |
ae1ee11b | 139 | |
0c752a93 SS |
140 | static int __init x86_xsave_setup(char *s) |
141 | { | |
142 | setup_clear_cpu_cap(X86_FEATURE_XSAVE); | |
143 | return 1; | |
144 | } | |
145 | __setup("noxsave", x86_xsave_setup); | |
146 | ||
ba51dced | 147 | #ifdef CONFIG_X86_32 |
3bc9b76b | 148 | static int cachesize_override __cpuinitdata = -1; |
3bc9b76b | 149 | static int disable_x86_serial_nr __cpuinitdata = 1; |
1da177e4 | 150 | |
0a488a53 YL |
151 | static int __init cachesize_setup(char *str) |
152 | { | |
153 | get_option(&str, &cachesize_override); | |
154 | return 1; | |
155 | } | |
156 | __setup("cachesize=", cachesize_setup); | |
157 | ||
0a488a53 YL |
158 | static int __init x86_fxsr_setup(char *s) |
159 | { | |
160 | setup_clear_cpu_cap(X86_FEATURE_FXSR); | |
161 | setup_clear_cpu_cap(X86_FEATURE_XMM); | |
162 | return 1; | |
163 | } | |
164 | __setup("nofxsr", x86_fxsr_setup); | |
165 | ||
166 | static int __init x86_sep_setup(char *s) | |
167 | { | |
168 | setup_clear_cpu_cap(X86_FEATURE_SEP); | |
169 | return 1; | |
170 | } | |
171 | __setup("nosep", x86_sep_setup); | |
172 | ||
173 | /* Standard macro to see if a specific flag is changeable */ | |
174 | static inline int flag_is_changeable_p(u32 flag) | |
175 | { | |
176 | u32 f1, f2; | |
177 | ||
94f6bac1 KH |
178 | /* |
179 | * Cyrix and IDT cpus allow disabling of CPUID | |
180 | * so the code below may return different results | |
181 | * when it is executed before and after enabling | |
182 | * the CPUID. Add "volatile" to not allow gcc to | |
183 | * optimize the subsequent calls to this function. | |
184 | */ | |
0f3fa48a IM |
185 | asm volatile ("pushfl \n\t" |
186 | "pushfl \n\t" | |
187 | "popl %0 \n\t" | |
188 | "movl %0, %1 \n\t" | |
189 | "xorl %2, %0 \n\t" | |
190 | "pushl %0 \n\t" | |
191 | "popfl \n\t" | |
192 | "pushfl \n\t" | |
193 | "popl %0 \n\t" | |
194 | "popfl \n\t" | |
195 | ||
94f6bac1 KH |
196 | : "=&r" (f1), "=&r" (f2) |
197 | : "ir" (flag)); | |
0a488a53 YL |
198 | |
199 | return ((f1^f2) & flag) != 0; | |
200 | } | |
201 | ||
202 | /* Probe for the CPUID instruction */ | |
203 | static int __cpuinit have_cpuid_p(void) | |
204 | { | |
205 | return flag_is_changeable_p(X86_EFLAGS_ID); | |
206 | } | |
207 | ||
208 | static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c) | |
209 | { | |
0f3fa48a IM |
210 | unsigned long lo, hi; |
211 | ||
212 | if (!cpu_has(c, X86_FEATURE_PN) || !disable_x86_serial_nr) | |
213 | return; | |
214 | ||
215 | /* Disable processor serial number: */ | |
216 | ||
217 | rdmsr(MSR_IA32_BBL_CR_CTL, lo, hi); | |
218 | lo |= 0x200000; | |
219 | wrmsr(MSR_IA32_BBL_CR_CTL, lo, hi); | |
220 | ||
221 | printk(KERN_NOTICE "CPU serial number disabled.\n"); | |
222 | clear_cpu_cap(c, X86_FEATURE_PN); | |
223 | ||
224 | /* Disabling the serial number may affect the cpuid level */ | |
225 | c->cpuid_level = cpuid_eax(0); | |
0a488a53 YL |
226 | } |
227 | ||
228 | static int __init x86_serial_nr_setup(char *s) | |
229 | { | |
230 | disable_x86_serial_nr = 0; | |
231 | return 1; | |
232 | } | |
233 | __setup("serialnumber", x86_serial_nr_setup); | |
ba51dced | 234 | #else |
102bbe3a YL |
235 | static inline int flag_is_changeable_p(u32 flag) |
236 | { | |
237 | return 1; | |
238 | } | |
ba51dced YL |
239 | /* Probe for the CPUID instruction */ |
240 | static inline int have_cpuid_p(void) | |
241 | { | |
242 | return 1; | |
243 | } | |
102bbe3a YL |
244 | static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c) |
245 | { | |
246 | } | |
ba51dced | 247 | #endif |
0a488a53 | 248 | |
b38b0665 PA |
249 | /* |
250 | * Some CPU features depend on higher CPUID levels, which may not always | |
251 | * be available due to CPUID level capping or broken virtualization | |
252 | * software. Add those features to this table to auto-disable them. | |
253 | */ | |
254 | struct cpuid_dependent_feature { | |
255 | u32 feature; | |
256 | u32 level; | |
257 | }; | |
0f3fa48a | 258 | |
b38b0665 PA |
259 | static const struct cpuid_dependent_feature __cpuinitconst |
260 | cpuid_dependent_features[] = { | |
261 | { X86_FEATURE_MWAIT, 0x00000005 }, | |
262 | { X86_FEATURE_DCA, 0x00000009 }, | |
263 | { X86_FEATURE_XSAVE, 0x0000000d }, | |
264 | { 0, 0 } | |
265 | }; | |
266 | ||
267 | static void __cpuinit filter_cpuid_features(struct cpuinfo_x86 *c, bool warn) | |
268 | { | |
269 | const struct cpuid_dependent_feature *df; | |
9766cdbc | 270 | |
b38b0665 | 271 | for (df = cpuid_dependent_features; df->feature; df++) { |
0f3fa48a IM |
272 | |
273 | if (!cpu_has(c, df->feature)) | |
274 | continue; | |
b38b0665 PA |
275 | /* |
276 | * Note: cpuid_level is set to -1 if unavailable, but | |
277 | * extended_extended_level is set to 0 if unavailable | |
278 | * and the legitimate extended levels are all negative | |
279 | * when signed; hence the weird messing around with | |
280 | * signs here... | |
281 | */ | |
0f3fa48a | 282 | if (!((s32)df->level < 0 ? |
f6db44df | 283 | (u32)df->level > (u32)c->extended_cpuid_level : |
0f3fa48a IM |
284 | (s32)df->level > (s32)c->cpuid_level)) |
285 | continue; | |
286 | ||
287 | clear_cpu_cap(c, df->feature); | |
288 | if (!warn) | |
289 | continue; | |
290 | ||
291 | printk(KERN_WARNING | |
292 | "CPU: CPU feature %s disabled, no CPUID level 0x%x\n", | |
293 | x86_cap_flags[df->feature], df->level); | |
b38b0665 | 294 | } |
f6db44df | 295 | } |
b38b0665 | 296 | |
102bbe3a YL |
297 | /* |
298 | * Naming convention should be: <Name> [(<Codename>)] | |
299 | * This table only is used unless init_<vendor>() below doesn't set it; | |
0f3fa48a IM |
300 | * in particular, if CPUID levels 0x80000002..4 are supported, this |
301 | * isn't used | |
102bbe3a YL |
302 | */ |
303 | ||
304 | /* Look up CPU names by table lookup. */ | |
02dde8b4 | 305 | static const char *__cpuinit table_lookup_model(struct cpuinfo_x86 *c) |
102bbe3a | 306 | { |
02dde8b4 | 307 | const struct cpu_model_info *info; |
102bbe3a YL |
308 | |
309 | if (c->x86_model >= 16) | |
310 | return NULL; /* Range check */ | |
311 | ||
312 | if (!this_cpu) | |
313 | return NULL; | |
314 | ||
315 | info = this_cpu->c_models; | |
316 | ||
317 | while (info && info->family) { | |
318 | if (info->family == c->x86) | |
319 | return info->model_names[c->x86_model]; | |
320 | info++; | |
321 | } | |
322 | return NULL; /* Not found */ | |
323 | } | |
324 | ||
3e0c3737 YL |
325 | __u32 cpu_caps_cleared[NCAPINTS] __cpuinitdata; |
326 | __u32 cpu_caps_set[NCAPINTS] __cpuinitdata; | |
7d851c8d | 327 | |
11e3a840 JF |
328 | void load_percpu_segment(int cpu) |
329 | { | |
330 | #ifdef CONFIG_X86_32 | |
331 | loadsegment(fs, __KERNEL_PERCPU); | |
332 | #else | |
333 | loadsegment(gs, 0); | |
334 | wrmsrl(MSR_GS_BASE, (unsigned long)per_cpu(irq_stack_union.gs_base, cpu)); | |
335 | #endif | |
60a5317f | 336 | load_stack_canary_segment(); |
11e3a840 JF |
337 | } |
338 | ||
0f3fa48a IM |
339 | /* |
340 | * Current gdt points %fs at the "master" per-cpu area: after this, | |
341 | * it's on the real one. | |
342 | */ | |
552be871 | 343 | void switch_to_new_gdt(int cpu) |
9d31d35b YL |
344 | { |
345 | struct desc_ptr gdt_descr; | |
346 | ||
2697fbd5 | 347 | gdt_descr.address = (long)get_cpu_gdt_table(cpu); |
9d31d35b YL |
348 | gdt_descr.size = GDT_SIZE - 1; |
349 | load_gdt(&gdt_descr); | |
2697fbd5 | 350 | /* Reload the per-cpu base */ |
11e3a840 JF |
351 | |
352 | load_percpu_segment(cpu); | |
9d31d35b YL |
353 | } |
354 | ||
02dde8b4 | 355 | static const struct cpu_dev *__cpuinitdata cpu_devs[X86_VENDOR_NUM] = {}; |
1da177e4 | 356 | |
1b05d60d | 357 | static void __cpuinit get_model_name(struct cpuinfo_x86 *c) |
1da177e4 LT |
358 | { |
359 | unsigned int *v; | |
360 | char *p, *q; | |
361 | ||
3da99c97 | 362 | if (c->extended_cpuid_level < 0x80000004) |
1b05d60d | 363 | return; |
1da177e4 | 364 | |
0f3fa48a | 365 | v = (unsigned int *)c->x86_model_id; |
1da177e4 LT |
366 | cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]); |
367 | cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]); | |
368 | cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]); | |
369 | c->x86_model_id[48] = 0; | |
370 | ||
0f3fa48a IM |
371 | /* |
372 | * Intel chips right-justify this string for some dumb reason; | |
373 | * undo that brain damage: | |
374 | */ | |
1da177e4 | 375 | p = q = &c->x86_model_id[0]; |
34048c9e | 376 | while (*p == ' ') |
9766cdbc | 377 | p++; |
34048c9e | 378 | if (p != q) { |
9766cdbc JSR |
379 | while (*p) |
380 | *q++ = *p++; | |
381 | while (q <= &c->x86_model_id[48]) | |
382 | *q++ = '\0'; /* Zero-pad the rest */ | |
1da177e4 | 383 | } |
1da177e4 LT |
384 | } |
385 | ||
27c13ece | 386 | void __cpuinit cpu_detect_cache_sizes(struct cpuinfo_x86 *c) |
1da177e4 | 387 | { |
9d31d35b | 388 | unsigned int n, dummy, ebx, ecx, edx, l2size; |
1da177e4 | 389 | |
3da99c97 | 390 | n = c->extended_cpuid_level; |
1da177e4 LT |
391 | |
392 | if (n >= 0x80000005) { | |
9d31d35b | 393 | cpuid(0x80000005, &dummy, &ebx, &ecx, &edx); |
9d31d35b | 394 | c->x86_cache_size = (ecx>>24) + (edx>>24); |
140fc727 YL |
395 | #ifdef CONFIG_X86_64 |
396 | /* On K8 L1 TLB is inclusive, so don't count it */ | |
397 | c->x86_tlbsize = 0; | |
398 | #endif | |
1da177e4 LT |
399 | } |
400 | ||
401 | if (n < 0x80000006) /* Some chips just has a large L1. */ | |
402 | return; | |
403 | ||
0a488a53 | 404 | cpuid(0x80000006, &dummy, &ebx, &ecx, &edx); |
1da177e4 | 405 | l2size = ecx >> 16; |
34048c9e | 406 | |
140fc727 YL |
407 | #ifdef CONFIG_X86_64 |
408 | c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff); | |
409 | #else | |
1da177e4 LT |
410 | /* do processor-specific cache resizing */ |
411 | if (this_cpu->c_size_cache) | |
34048c9e | 412 | l2size = this_cpu->c_size_cache(c, l2size); |
1da177e4 LT |
413 | |
414 | /* Allow user to override all this if necessary. */ | |
415 | if (cachesize_override != -1) | |
416 | l2size = cachesize_override; | |
417 | ||
34048c9e | 418 | if (l2size == 0) |
1da177e4 | 419 | return; /* Again, no L2 cache is possible */ |
140fc727 | 420 | #endif |
1da177e4 LT |
421 | |
422 | c->x86_cache_size = l2size; | |
1da177e4 LT |
423 | } |
424 | ||
9d31d35b | 425 | void __cpuinit detect_ht(struct cpuinfo_x86 *c) |
1da177e4 | 426 | { |
97e4db7c | 427 | #ifdef CONFIG_X86_HT |
0a488a53 YL |
428 | u32 eax, ebx, ecx, edx; |
429 | int index_msb, core_bits; | |
2eaad1fd | 430 | static bool printed; |
1da177e4 | 431 | |
0a488a53 | 432 | if (!cpu_has(c, X86_FEATURE_HT)) |
9d31d35b | 433 | return; |
1da177e4 | 434 | |
0a488a53 YL |
435 | if (cpu_has(c, X86_FEATURE_CMP_LEGACY)) |
436 | goto out; | |
1da177e4 | 437 | |
1cd78776 YL |
438 | if (cpu_has(c, X86_FEATURE_XTOPOLOGY)) |
439 | return; | |
1da177e4 | 440 | |
0a488a53 | 441 | cpuid(1, &eax, &ebx, &ecx, &edx); |
1da177e4 | 442 | |
9d31d35b YL |
443 | smp_num_siblings = (ebx & 0xff0000) >> 16; |
444 | ||
445 | if (smp_num_siblings == 1) { | |
2eaad1fd | 446 | printk_once(KERN_INFO "CPU0: Hyper-Threading is disabled\n"); |
0f3fa48a IM |
447 | goto out; |
448 | } | |
9d31d35b | 449 | |
0f3fa48a IM |
450 | if (smp_num_siblings <= 1) |
451 | goto out; | |
9d31d35b | 452 | |
0f3fa48a IM |
453 | if (smp_num_siblings > nr_cpu_ids) { |
454 | pr_warning("CPU: Unsupported number of siblings %d", | |
455 | smp_num_siblings); | |
456 | smp_num_siblings = 1; | |
457 | return; | |
458 | } | |
9d31d35b | 459 | |
0f3fa48a IM |
460 | index_msb = get_count_order(smp_num_siblings); |
461 | c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid, index_msb); | |
9d31d35b | 462 | |
0f3fa48a | 463 | smp_num_siblings = smp_num_siblings / c->x86_max_cores; |
9d31d35b | 464 | |
0f3fa48a | 465 | index_msb = get_count_order(smp_num_siblings); |
9d31d35b | 466 | |
0f3fa48a | 467 | core_bits = get_count_order(c->x86_max_cores); |
9d31d35b | 468 | |
0f3fa48a IM |
469 | c->cpu_core_id = apic->phys_pkg_id(c->initial_apicid, index_msb) & |
470 | ((1 << core_bits) - 1); | |
1da177e4 | 471 | |
0a488a53 | 472 | out: |
2eaad1fd | 473 | if (!printed && (c->x86_max_cores * smp_num_siblings) > 1) { |
0a488a53 YL |
474 | printk(KERN_INFO "CPU: Physical Processor ID: %d\n", |
475 | c->phys_proc_id); | |
476 | printk(KERN_INFO "CPU: Processor Core ID: %d\n", | |
477 | c->cpu_core_id); | |
2eaad1fd | 478 | printed = 1; |
9d31d35b | 479 | } |
9d31d35b | 480 | #endif |
97e4db7c | 481 | } |
1da177e4 | 482 | |
3da99c97 | 483 | static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c) |
1da177e4 LT |
484 | { |
485 | char *v = c->x86_vendor_id; | |
0f3fa48a | 486 | int i; |
1da177e4 LT |
487 | |
488 | for (i = 0; i < X86_VENDOR_NUM; i++) { | |
10a434fc YL |
489 | if (!cpu_devs[i]) |
490 | break; | |
491 | ||
492 | if (!strcmp(v, cpu_devs[i]->c_ident[0]) || | |
493 | (cpu_devs[i]->c_ident[1] && | |
494 | !strcmp(v, cpu_devs[i]->c_ident[1]))) { | |
0f3fa48a | 495 | |
10a434fc YL |
496 | this_cpu = cpu_devs[i]; |
497 | c->x86_vendor = this_cpu->c_x86_vendor; | |
498 | return; | |
1da177e4 LT |
499 | } |
500 | } | |
10a434fc | 501 | |
a9c56953 MK |
502 | printk_once(KERN_ERR |
503 | "CPU: vendor_id '%s' unknown, using generic init.\n" \ | |
504 | "CPU: Your system may be unstable.\n", v); | |
10a434fc | 505 | |
fe38d855 CE |
506 | c->x86_vendor = X86_VENDOR_UNKNOWN; |
507 | this_cpu = &default_cpu; | |
1da177e4 LT |
508 | } |
509 | ||
9d31d35b | 510 | void __cpuinit cpu_detect(struct cpuinfo_x86 *c) |
1da177e4 | 511 | { |
1da177e4 | 512 | /* Get vendor name */ |
4a148513 HH |
513 | cpuid(0x00000000, (unsigned int *)&c->cpuid_level, |
514 | (unsigned int *)&c->x86_vendor_id[0], | |
515 | (unsigned int *)&c->x86_vendor_id[8], | |
516 | (unsigned int *)&c->x86_vendor_id[4]); | |
1da177e4 | 517 | |
1da177e4 | 518 | c->x86 = 4; |
9d31d35b | 519 | /* Intel-defined flags: level 0x00000001 */ |
1da177e4 LT |
520 | if (c->cpuid_level >= 0x00000001) { |
521 | u32 junk, tfms, cap0, misc; | |
0f3fa48a | 522 | |
1da177e4 | 523 | cpuid(0x00000001, &tfms, &misc, &junk, &cap0); |
9d31d35b YL |
524 | c->x86 = (tfms >> 8) & 0xf; |
525 | c->x86_model = (tfms >> 4) & 0xf; | |
526 | c->x86_mask = tfms & 0xf; | |
0f3fa48a | 527 | |
f5f786d0 | 528 | if (c->x86 == 0xf) |
1da177e4 | 529 | c->x86 += (tfms >> 20) & 0xff; |
f5f786d0 | 530 | if (c->x86 >= 0x6) |
9d31d35b | 531 | c->x86_model += ((tfms >> 16) & 0xf) << 4; |
0f3fa48a | 532 | |
d4387bd3 | 533 | if (cap0 & (1<<19)) { |
d4387bd3 | 534 | c->x86_clflush_size = ((misc >> 8) & 0xff) * 8; |
9d31d35b | 535 | c->x86_cache_alignment = c->x86_clflush_size; |
d4387bd3 | 536 | } |
1da177e4 | 537 | } |
1da177e4 | 538 | } |
3da99c97 YL |
539 | |
540 | static void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c) | |
093af8d7 YL |
541 | { |
542 | u32 tfms, xlvl; | |
3da99c97 | 543 | u32 ebx; |
093af8d7 | 544 | |
3da99c97 YL |
545 | /* Intel-defined flags: level 0x00000001 */ |
546 | if (c->cpuid_level >= 0x00000001) { | |
547 | u32 capability, excap; | |
0f3fa48a | 548 | |
3da99c97 YL |
549 | cpuid(0x00000001, &tfms, &ebx, &excap, &capability); |
550 | c->x86_capability[0] = capability; | |
551 | c->x86_capability[4] = excap; | |
552 | } | |
093af8d7 | 553 | |
bdc802dc PA |
554 | /* Additional Intel-defined flags: level 0x00000007 */ |
555 | if (c->cpuid_level >= 0x00000007) { | |
556 | u32 eax, ebx, ecx, edx; | |
557 | ||
558 | cpuid_count(0x00000007, 0, &eax, &ebx, &ecx, &edx); | |
559 | ||
560 | if (eax > 0) | |
561 | c->x86_capability[9] = ebx; | |
562 | } | |
563 | ||
3da99c97 YL |
564 | /* AMD-defined flags: level 0x80000001 */ |
565 | xlvl = cpuid_eax(0x80000000); | |
566 | c->extended_cpuid_level = xlvl; | |
0f3fa48a | 567 | |
3da99c97 YL |
568 | if ((xlvl & 0xffff0000) == 0x80000000) { |
569 | if (xlvl >= 0x80000001) { | |
570 | c->x86_capability[1] = cpuid_edx(0x80000001); | |
571 | c->x86_capability[6] = cpuid_ecx(0x80000001); | |
093af8d7 | 572 | } |
093af8d7 | 573 | } |
093af8d7 | 574 | |
5122c890 YL |
575 | if (c->extended_cpuid_level >= 0x80000008) { |
576 | u32 eax = cpuid_eax(0x80000008); | |
577 | ||
578 | c->x86_virt_bits = (eax >> 8) & 0xff; | |
579 | c->x86_phys_bits = eax & 0xff; | |
093af8d7 | 580 | } |
13c6c532 JB |
581 | #ifdef CONFIG_X86_32 |
582 | else if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36)) | |
583 | c->x86_phys_bits = 36; | |
5122c890 | 584 | #endif |
e3224234 YL |
585 | |
586 | if (c->extended_cpuid_level >= 0x80000007) | |
587 | c->x86_power = cpuid_edx(0x80000007); | |
093af8d7 YL |
588 | |
589 | } | |
1da177e4 | 590 | |
aef93c8b YL |
591 | static void __cpuinit identify_cpu_without_cpuid(struct cpuinfo_x86 *c) |
592 | { | |
593 | #ifdef CONFIG_X86_32 | |
594 | int i; | |
595 | ||
596 | /* | |
597 | * First of all, decide if this is a 486 or higher | |
598 | * It's a 486 if we can modify the AC flag | |
599 | */ | |
600 | if (flag_is_changeable_p(X86_EFLAGS_AC)) | |
601 | c->x86 = 4; | |
602 | else | |
603 | c->x86 = 3; | |
604 | ||
605 | for (i = 0; i < X86_VENDOR_NUM; i++) | |
606 | if (cpu_devs[i] && cpu_devs[i]->c_identify) { | |
607 | c->x86_vendor_id[0] = 0; | |
608 | cpu_devs[i]->c_identify(c); | |
609 | if (c->x86_vendor_id[0]) { | |
610 | get_cpu_vendor(c); | |
611 | break; | |
612 | } | |
613 | } | |
614 | #endif | |
615 | } | |
616 | ||
34048c9e PC |
617 | /* |
618 | * Do minimum CPU detection early. | |
619 | * Fields really needed: vendor, cpuid_level, family, model, mask, | |
620 | * cache alignment. | |
621 | * The others are not touched to avoid unwanted side effects. | |
622 | * | |
623 | * WARNING: this function is only called on the BP. Don't add code here | |
624 | * that is supposed to run on all CPUs. | |
625 | */ | |
3da99c97 | 626 | static void __init early_identify_cpu(struct cpuinfo_x86 *c) |
d7cd5611 | 627 | { |
6627d242 YL |
628 | #ifdef CONFIG_X86_64 |
629 | c->x86_clflush_size = 64; | |
13c6c532 JB |
630 | c->x86_phys_bits = 36; |
631 | c->x86_virt_bits = 48; | |
6627d242 | 632 | #else |
d4387bd3 | 633 | c->x86_clflush_size = 32; |
13c6c532 JB |
634 | c->x86_phys_bits = 32; |
635 | c->x86_virt_bits = 32; | |
6627d242 | 636 | #endif |
0a488a53 | 637 | c->x86_cache_alignment = c->x86_clflush_size; |
d7cd5611 | 638 | |
3da99c97 | 639 | memset(&c->x86_capability, 0, sizeof c->x86_capability); |
0a488a53 | 640 | c->extended_cpuid_level = 0; |
d7cd5611 | 641 | |
aef93c8b YL |
642 | if (!have_cpuid_p()) |
643 | identify_cpu_without_cpuid(c); | |
644 | ||
645 | /* cyrix could have cpuid enabled via c_identify()*/ | |
d7cd5611 RR |
646 | if (!have_cpuid_p()) |
647 | return; | |
648 | ||
649 | cpu_detect(c); | |
650 | ||
3da99c97 | 651 | get_cpu_vendor(c); |
2b16a235 | 652 | |
3da99c97 | 653 | get_cpu_cap(c); |
12cf105c | 654 | |
10a434fc YL |
655 | if (this_cpu->c_early_init) |
656 | this_cpu->c_early_init(c); | |
093af8d7 | 657 | |
1c4acdb4 | 658 | #ifdef CONFIG_SMP |
bfcb4c1b | 659 | c->cpu_index = boot_cpu_id; |
1c4acdb4 | 660 | #endif |
b38b0665 | 661 | filter_cpuid_features(c, false); |
d7cd5611 RR |
662 | } |
663 | ||
9d31d35b YL |
664 | void __init early_cpu_init(void) |
665 | { | |
02dde8b4 | 666 | const struct cpu_dev *const *cdev; |
10a434fc YL |
667 | int count = 0; |
668 | ||
31c997ca | 669 | #ifdef PROCESSOR_SELECT |
9766cdbc | 670 | printk(KERN_INFO "KERNEL supported cpus:\n"); |
31c997ca IM |
671 | #endif |
672 | ||
10a434fc | 673 | for (cdev = __x86_cpu_dev_start; cdev < __x86_cpu_dev_end; cdev++) { |
02dde8b4 | 674 | const struct cpu_dev *cpudev = *cdev; |
9d31d35b | 675 | |
10a434fc YL |
676 | if (count >= X86_VENDOR_NUM) |
677 | break; | |
678 | cpu_devs[count] = cpudev; | |
679 | count++; | |
680 | ||
31c997ca IM |
681 | #ifdef PROCESSOR_SELECT |
682 | { | |
683 | unsigned int j; | |
684 | ||
685 | for (j = 0; j < 2; j++) { | |
686 | if (!cpudev->c_ident[j]) | |
687 | continue; | |
688 | printk(KERN_INFO " %s %s\n", cpudev->c_vendor, | |
689 | cpudev->c_ident[j]); | |
690 | } | |
10a434fc | 691 | } |
0388423d | 692 | #endif |
10a434fc | 693 | } |
9d31d35b | 694 | early_identify_cpu(&boot_cpu_data); |
d7cd5611 | 695 | } |
093af8d7 | 696 | |
b6734c35 PA |
697 | /* |
698 | * The NOPL instruction is supposed to exist on all CPUs with | |
ba0593bf | 699 | * family >= 6; unfortunately, that's not true in practice because |
b6734c35 | 700 | * of early VIA chips and (more importantly) broken virtualizers that |
ba0593bf PA |
701 | * are not easy to detect. In the latter case it doesn't even *fail* |
702 | * reliably, so probing for it doesn't even work. Disable it completely | |
703 | * unless we can find a reliable way to detect all the broken cases. | |
b6734c35 PA |
704 | */ |
705 | static void __cpuinit detect_nopl(struct cpuinfo_x86 *c) | |
706 | { | |
b6734c35 | 707 | clear_cpu_cap(c, X86_FEATURE_NOPL); |
d7cd5611 RR |
708 | } |
709 | ||
34048c9e | 710 | static void __cpuinit generic_identify(struct cpuinfo_x86 *c) |
1da177e4 | 711 | { |
aef93c8b | 712 | c->extended_cpuid_level = 0; |
1da177e4 | 713 | |
3da99c97 | 714 | if (!have_cpuid_p()) |
aef93c8b | 715 | identify_cpu_without_cpuid(c); |
1d67953f | 716 | |
aef93c8b | 717 | /* cyrix could have cpuid enabled via c_identify()*/ |
a9853dd6 | 718 | if (!have_cpuid_p()) |
aef93c8b | 719 | return; |
1da177e4 | 720 | |
3da99c97 | 721 | cpu_detect(c); |
1da177e4 | 722 | |
3da99c97 | 723 | get_cpu_vendor(c); |
1da177e4 | 724 | |
3da99c97 | 725 | get_cpu_cap(c); |
1da177e4 | 726 | |
3da99c97 YL |
727 | if (c->cpuid_level >= 0x00000001) { |
728 | c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF; | |
b89d3b3e YL |
729 | #ifdef CONFIG_X86_32 |
730 | # ifdef CONFIG_X86_HT | |
cb8cc442 | 731 | c->apicid = apic->phys_pkg_id(c->initial_apicid, 0); |
b89d3b3e | 732 | # else |
3da99c97 | 733 | c->apicid = c->initial_apicid; |
b89d3b3e YL |
734 | # endif |
735 | #endif | |
1da177e4 | 736 | |
b89d3b3e YL |
737 | #ifdef CONFIG_X86_HT |
738 | c->phys_proc_id = c->initial_apicid; | |
1e9f28fa | 739 | #endif |
3da99c97 | 740 | } |
1da177e4 | 741 | |
1b05d60d | 742 | get_model_name(c); /* Default name */ |
1da177e4 | 743 | |
3da99c97 YL |
744 | init_scattered_cpuid_features(c); |
745 | detect_nopl(c); | |
1da177e4 | 746 | } |
1da177e4 LT |
747 | |
748 | /* | |
749 | * This does the hard work of actually picking apart the CPU stuff... | |
750 | */ | |
9a250347 | 751 | static void __cpuinit identify_cpu(struct cpuinfo_x86 *c) |
1da177e4 LT |
752 | { |
753 | int i; | |
754 | ||
755 | c->loops_per_jiffy = loops_per_jiffy; | |
756 | c->x86_cache_size = -1; | |
757 | c->x86_vendor = X86_VENDOR_UNKNOWN; | |
1da177e4 LT |
758 | c->x86_model = c->x86_mask = 0; /* So far unknown... */ |
759 | c->x86_vendor_id[0] = '\0'; /* Unset */ | |
760 | c->x86_model_id[0] = '\0'; /* Unset */ | |
94605eff | 761 | c->x86_max_cores = 1; |
102bbe3a | 762 | c->x86_coreid_bits = 0; |
11fdd252 | 763 | #ifdef CONFIG_X86_64 |
102bbe3a | 764 | c->x86_clflush_size = 64; |
13c6c532 JB |
765 | c->x86_phys_bits = 36; |
766 | c->x86_virt_bits = 48; | |
102bbe3a YL |
767 | #else |
768 | c->cpuid_level = -1; /* CPUID not detected */ | |
770d132f | 769 | c->x86_clflush_size = 32; |
13c6c532 JB |
770 | c->x86_phys_bits = 32; |
771 | c->x86_virt_bits = 32; | |
102bbe3a YL |
772 | #endif |
773 | c->x86_cache_alignment = c->x86_clflush_size; | |
1da177e4 LT |
774 | memset(&c->x86_capability, 0, sizeof c->x86_capability); |
775 | ||
1da177e4 LT |
776 | generic_identify(c); |
777 | ||
3898534d | 778 | if (this_cpu->c_identify) |
1da177e4 LT |
779 | this_cpu->c_identify(c); |
780 | ||
2759c328 YL |
781 | /* Clear/Set all flags overriden by options, after probe */ |
782 | for (i = 0; i < NCAPINTS; i++) { | |
783 | c->x86_capability[i] &= ~cpu_caps_cleared[i]; | |
784 | c->x86_capability[i] |= cpu_caps_set[i]; | |
785 | } | |
786 | ||
102bbe3a | 787 | #ifdef CONFIG_X86_64 |
cb8cc442 | 788 | c->apicid = apic->phys_pkg_id(c->initial_apicid, 0); |
102bbe3a YL |
789 | #endif |
790 | ||
1da177e4 LT |
791 | /* |
792 | * Vendor-specific initialization. In this section we | |
793 | * canonicalize the feature flags, meaning if there are | |
794 | * features a certain CPU supports which CPUID doesn't | |
795 | * tell us, CPUID claiming incorrect flags, or other bugs, | |
796 | * we handle them here. | |
797 | * | |
798 | * At the end of this section, c->x86_capability better | |
799 | * indicate the features this CPU genuinely supports! | |
800 | */ | |
801 | if (this_cpu->c_init) | |
802 | this_cpu->c_init(c); | |
803 | ||
804 | /* Disable the PN if appropriate */ | |
805 | squash_the_stupid_serial_number(c); | |
806 | ||
807 | /* | |
0f3fa48a IM |
808 | * The vendor-specific functions might have changed features. |
809 | * Now we do "generic changes." | |
1da177e4 LT |
810 | */ |
811 | ||
b38b0665 PA |
812 | /* Filter out anything that depends on CPUID levels we don't have */ |
813 | filter_cpuid_features(c, true); | |
814 | ||
1da177e4 | 815 | /* If the model name is still unset, do table lookup. */ |
34048c9e | 816 | if (!c->x86_model_id[0]) { |
02dde8b4 | 817 | const char *p; |
1da177e4 | 818 | p = table_lookup_model(c); |
34048c9e | 819 | if (p) |
1da177e4 LT |
820 | strcpy(c->x86_model_id, p); |
821 | else | |
822 | /* Last resort... */ | |
823 | sprintf(c->x86_model_id, "%02x/%02x", | |
54a20f8c | 824 | c->x86, c->x86_model); |
1da177e4 LT |
825 | } |
826 | ||
102bbe3a YL |
827 | #ifdef CONFIG_X86_64 |
828 | detect_ht(c); | |
829 | #endif | |
830 | ||
88b094fb | 831 | init_hypervisor(c); |
3e0c3737 YL |
832 | |
833 | /* | |
834 | * Clear/Set all flags overriden by options, need do it | |
835 | * before following smp all cpus cap AND. | |
836 | */ | |
837 | for (i = 0; i < NCAPINTS; i++) { | |
838 | c->x86_capability[i] &= ~cpu_caps_cleared[i]; | |
839 | c->x86_capability[i] |= cpu_caps_set[i]; | |
840 | } | |
841 | ||
1da177e4 LT |
842 | /* |
843 | * On SMP, boot_cpu_data holds the common feature set between | |
844 | * all CPUs; so make sure that we indicate which features are | |
845 | * common between the CPUs. The first time this routine gets | |
846 | * executed, c == &boot_cpu_data. | |
847 | */ | |
34048c9e | 848 | if (c != &boot_cpu_data) { |
1da177e4 | 849 | /* AND the already accumulated flags with these */ |
9d31d35b | 850 | for (i = 0; i < NCAPINTS; i++) |
1da177e4 LT |
851 | boot_cpu_data.x86_capability[i] &= c->x86_capability[i]; |
852 | } | |
853 | ||
854 | /* Init Machine Check Exception if available. */ | |
5e09954a | 855 | mcheck_cpu_init(c); |
30d432df AK |
856 | |
857 | select_idle_routine(c); | |
102bbe3a YL |
858 | |
859 | #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64) | |
860 | numa_add_cpu(smp_processor_id()); | |
861 | #endif | |
a6c4e076 | 862 | } |
31ab269a | 863 | |
e04d645f GC |
864 | #ifdef CONFIG_X86_64 |
865 | static void vgetcpu_set_mode(void) | |
866 | { | |
867 | if (cpu_has(&boot_cpu_data, X86_FEATURE_RDTSCP)) | |
868 | vgetcpu_mode = VGETCPU_RDTSCP; | |
869 | else | |
870 | vgetcpu_mode = VGETCPU_LSL; | |
871 | } | |
872 | #endif | |
873 | ||
a6c4e076 JF |
874 | void __init identify_boot_cpu(void) |
875 | { | |
876 | identify_cpu(&boot_cpu_data); | |
30e1e6d1 | 877 | init_c1e_mask(); |
102bbe3a | 878 | #ifdef CONFIG_X86_32 |
a6c4e076 | 879 | sysenter_setup(); |
6fe940d6 | 880 | enable_sep_cpu(); |
e04d645f GC |
881 | #else |
882 | vgetcpu_set_mode(); | |
102bbe3a | 883 | #endif |
cdd6c482 | 884 | init_hw_perf_events(); |
a6c4e076 | 885 | } |
3b520b23 | 886 | |
a6c4e076 JF |
887 | void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c) |
888 | { | |
889 | BUG_ON(c == &boot_cpu_data); | |
890 | identify_cpu(c); | |
102bbe3a | 891 | #ifdef CONFIG_X86_32 |
a6c4e076 | 892 | enable_sep_cpu(); |
102bbe3a | 893 | #endif |
a6c4e076 | 894 | mtrr_ap_init(); |
1da177e4 LT |
895 | } |
896 | ||
a0854a46 | 897 | struct msr_range { |
0f3fa48a IM |
898 | unsigned min; |
899 | unsigned max; | |
a0854a46 | 900 | }; |
1da177e4 | 901 | |
02dde8b4 | 902 | static const struct msr_range msr_range_array[] __cpuinitconst = { |
a0854a46 YL |
903 | { 0x00000000, 0x00000418}, |
904 | { 0xc0000000, 0xc000040b}, | |
905 | { 0xc0010000, 0xc0010142}, | |
906 | { 0xc0011000, 0xc001103b}, | |
907 | }; | |
1da177e4 | 908 | |
a0854a46 YL |
909 | static void __cpuinit print_cpu_msr(void) |
910 | { | |
0f3fa48a | 911 | unsigned index_min, index_max; |
a0854a46 YL |
912 | unsigned index; |
913 | u64 val; | |
914 | int i; | |
a0854a46 YL |
915 | |
916 | for (i = 0; i < ARRAY_SIZE(msr_range_array); i++) { | |
917 | index_min = msr_range_array[i].min; | |
918 | index_max = msr_range_array[i].max; | |
0f3fa48a | 919 | |
a0854a46 YL |
920 | for (index = index_min; index < index_max; index++) { |
921 | if (rdmsrl_amd_safe(index, &val)) | |
922 | continue; | |
923 | printk(KERN_INFO " MSR%08x: %016llx\n", index, val); | |
1da177e4 | 924 | } |
a0854a46 YL |
925 | } |
926 | } | |
94605eff | 927 | |
a0854a46 | 928 | static int show_msr __cpuinitdata; |
0f3fa48a | 929 | |
a0854a46 YL |
930 | static __init int setup_show_msr(char *arg) |
931 | { | |
932 | int num; | |
3dd9d514 | 933 | |
a0854a46 | 934 | get_option(&arg, &num); |
3dd9d514 | 935 | |
a0854a46 YL |
936 | if (num > 0) |
937 | show_msr = num; | |
938 | return 1; | |
1da177e4 | 939 | } |
a0854a46 | 940 | __setup("show_msr=", setup_show_msr); |
1da177e4 | 941 | |
191679fd AK |
942 | static __init int setup_noclflush(char *arg) |
943 | { | |
944 | setup_clear_cpu_cap(X86_FEATURE_CLFLSH); | |
945 | return 1; | |
946 | } | |
947 | __setup("noclflush", setup_noclflush); | |
948 | ||
3bc9b76b | 949 | void __cpuinit print_cpu_info(struct cpuinfo_x86 *c) |
1da177e4 | 950 | { |
02dde8b4 | 951 | const char *vendor = NULL; |
1da177e4 | 952 | |
0f3fa48a | 953 | if (c->x86_vendor < X86_VENDOR_NUM) { |
1da177e4 | 954 | vendor = this_cpu->c_vendor; |
0f3fa48a IM |
955 | } else { |
956 | if (c->cpuid_level >= 0) | |
957 | vendor = c->x86_vendor_id; | |
958 | } | |
1da177e4 | 959 | |
bd32a8cf | 960 | if (vendor && !strstr(c->x86_model_id, vendor)) |
9d31d35b | 961 | printk(KERN_CONT "%s ", vendor); |
1da177e4 | 962 | |
9d31d35b YL |
963 | if (c->x86_model_id[0]) |
964 | printk(KERN_CONT "%s", c->x86_model_id); | |
1da177e4 | 965 | else |
9d31d35b | 966 | printk(KERN_CONT "%d86", c->x86); |
1da177e4 | 967 | |
34048c9e | 968 | if (c->x86_mask || c->cpuid_level >= 0) |
9d31d35b | 969 | printk(KERN_CONT " stepping %02x\n", c->x86_mask); |
1da177e4 | 970 | else |
9d31d35b | 971 | printk(KERN_CONT "\n"); |
a0854a46 YL |
972 | |
973 | #ifdef CONFIG_SMP | |
974 | if (c->cpu_index < show_msr) | |
975 | print_cpu_msr(); | |
976 | #else | |
977 | if (show_msr) | |
978 | print_cpu_msr(); | |
979 | #endif | |
1da177e4 LT |
980 | } |
981 | ||
ac72e788 AK |
982 | static __init int setup_disablecpuid(char *arg) |
983 | { | |
984 | int bit; | |
0f3fa48a | 985 | |
ac72e788 AK |
986 | if (get_option(&arg, &bit) && bit < NCAPINTS*32) |
987 | setup_clear_cpu_cap(bit); | |
988 | else | |
989 | return 0; | |
0f3fa48a | 990 | |
ac72e788 AK |
991 | return 1; |
992 | } | |
993 | __setup("clearcpuid=", setup_disablecpuid); | |
994 | ||
d5494d4f | 995 | #ifdef CONFIG_X86_64 |
9ff80942 | 996 | struct desc_ptr idt_descr = { NR_VECTORS * 16 - 1, (unsigned long) idt_table }; |
d5494d4f | 997 | |
947e76cd BG |
998 | DEFINE_PER_CPU_FIRST(union irq_stack_union, |
999 | irq_stack_union) __aligned(PAGE_SIZE); | |
0f3fa48a | 1000 | |
bdf977b3 TH |
1001 | /* |
1002 | * The following four percpu variables are hot. Align current_task to | |
1003 | * cacheline size such that all four fall in the same cacheline. | |
1004 | */ | |
1005 | DEFINE_PER_CPU(struct task_struct *, current_task) ____cacheline_aligned = | |
1006 | &init_task; | |
1007 | EXPORT_PER_CPU_SYMBOL(current_task); | |
d5494d4f | 1008 | |
9af45651 BG |
1009 | DEFINE_PER_CPU(unsigned long, kernel_stack) = |
1010 | (unsigned long)&init_thread_union - KERNEL_STACK_OFFSET + THREAD_SIZE; | |
1011 | EXPORT_PER_CPU_SYMBOL(kernel_stack); | |
1012 | ||
bdf977b3 TH |
1013 | DEFINE_PER_CPU(char *, irq_stack_ptr) = |
1014 | init_per_cpu_var(irq_stack_union.irq_stack) + IRQ_STACK_SIZE - 64; | |
1015 | ||
56895530 | 1016 | DEFINE_PER_CPU(unsigned int, irq_count) = -1; |
d5494d4f | 1017 | |
0f3fa48a IM |
1018 | /* |
1019 | * Special IST stacks which the CPU switches to when it calls | |
1020 | * an IST-marked descriptor entry. Up to 7 stacks (hardware | |
1021 | * limit), all of them are 4K, except the debug stack which | |
1022 | * is 8K. | |
1023 | */ | |
1024 | static const unsigned int exception_stack_sizes[N_EXCEPTION_STACKS] = { | |
1025 | [0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STKSZ, | |
1026 | [DEBUG_STACK - 1] = DEBUG_STKSZ | |
1027 | }; | |
1028 | ||
92d65b23 | 1029 | static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks |
3e352aa8 | 1030 | [(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]); |
d5494d4f | 1031 | |
d5494d4f YL |
1032 | /* May not be marked __init: used by software suspend */ |
1033 | void syscall_init(void) | |
1da177e4 | 1034 | { |
d5494d4f YL |
1035 | /* |
1036 | * LSTAR and STAR live in a bit strange symbiosis. | |
1037 | * They both write to the same internal register. STAR allows to | |
1038 | * set CS/DS but only a 32bit target. LSTAR sets the 64bit rip. | |
1039 | */ | |
1040 | wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32); | |
1041 | wrmsrl(MSR_LSTAR, system_call); | |
1042 | wrmsrl(MSR_CSTAR, ignore_sysret); | |
03ae5768 | 1043 | |
d5494d4f YL |
1044 | #ifdef CONFIG_IA32_EMULATION |
1045 | syscall32_cpu_init(); | |
1046 | #endif | |
03ae5768 | 1047 | |
d5494d4f YL |
1048 | /* Flags to clear on syscall */ |
1049 | wrmsrl(MSR_SYSCALL_MASK, | |
1050 | X86_EFLAGS_TF|X86_EFLAGS_DF|X86_EFLAGS_IF|X86_EFLAGS_IOPL); | |
1da177e4 | 1051 | } |
62111195 | 1052 | |
d5494d4f YL |
1053 | unsigned long kernel_eflags; |
1054 | ||
1055 | /* | |
1056 | * Copies of the original ist values from the tss are only accessed during | |
1057 | * debugging, no special alignment required. | |
1058 | */ | |
1059 | DEFINE_PER_CPU(struct orig_ist, orig_ist); | |
1060 | ||
0f3fa48a | 1061 | #else /* CONFIG_X86_64 */ |
d5494d4f | 1062 | |
bdf977b3 TH |
1063 | DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task; |
1064 | EXPORT_PER_CPU_SYMBOL(current_task); | |
1065 | ||
60a5317f | 1066 | #ifdef CONFIG_CC_STACKPROTECTOR |
53f82452 | 1067 | DEFINE_PER_CPU_ALIGNED(struct stack_canary, stack_canary); |
60a5317f | 1068 | #endif |
d5494d4f | 1069 | |
60a5317f | 1070 | /* Make sure %fs and %gs are initialized properly in idle threads */ |
6b2fb3c6 | 1071 | struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs) |
f95d47ca JF |
1072 | { |
1073 | memset(regs, 0, sizeof(struct pt_regs)); | |
65ea5b03 | 1074 | regs->fs = __KERNEL_PERCPU; |
60a5317f | 1075 | regs->gs = __KERNEL_STACK_CANARY; |
0f3fa48a | 1076 | |
f95d47ca JF |
1077 | return regs; |
1078 | } | |
0f3fa48a | 1079 | #endif /* CONFIG_X86_64 */ |
c5413fbe | 1080 | |
9766cdbc JSR |
1081 | /* |
1082 | * Clear all 6 debug registers: | |
1083 | */ | |
1084 | static void clear_all_debug_regs(void) | |
1085 | { | |
1086 | int i; | |
1087 | ||
1088 | for (i = 0; i < 8; i++) { | |
1089 | /* Ignore db4, db5 */ | |
1090 | if ((i == 4) || (i == 5)) | |
1091 | continue; | |
1092 | ||
1093 | set_debugreg(0, i); | |
1094 | } | |
1095 | } | |
c5413fbe | 1096 | |
0bb9fef9 JW |
1097 | #ifdef CONFIG_KGDB |
1098 | /* | |
1099 | * Restore debug regs if using kgdbwait and you have a kernel debugger | |
1100 | * connection established. | |
1101 | */ | |
1102 | static void dbg_restore_debug_regs(void) | |
1103 | { | |
1104 | if (unlikely(kgdb_connected && arch_kgdb_ops.correct_hw_break)) | |
1105 | arch_kgdb_ops.correct_hw_break(); | |
1106 | } | |
1107 | #else /* ! CONFIG_KGDB */ | |
1108 | #define dbg_restore_debug_regs() | |
1109 | #endif /* ! CONFIG_KGDB */ | |
1110 | ||
d2cbcc49 RR |
1111 | /* |
1112 | * cpu_init() initializes state that is per-CPU. Some data is already | |
1113 | * initialized (naturally) in the bootstrap process, such as the GDT | |
1114 | * and IDT. We reload them nevertheless, this function acts as a | |
1115 | * 'CPU state barrier', nothing should get across. | |
1ba76586 | 1116 | * A lot of state is already set up in PDA init for 64 bit |
d2cbcc49 | 1117 | */ |
1ba76586 | 1118 | #ifdef CONFIG_X86_64 |
0f3fa48a | 1119 | |
1ba76586 YL |
1120 | void __cpuinit cpu_init(void) |
1121 | { | |
0fe1e009 | 1122 | struct orig_ist *oist; |
1ba76586 | 1123 | struct task_struct *me; |
0f3fa48a IM |
1124 | struct tss_struct *t; |
1125 | unsigned long v; | |
1126 | int cpu; | |
1ba76586 YL |
1127 | int i; |
1128 | ||
0f3fa48a IM |
1129 | cpu = stack_smp_processor_id(); |
1130 | t = &per_cpu(init_tss, cpu); | |
0fe1e009 | 1131 | oist = &per_cpu(orig_ist, cpu); |
0f3fa48a | 1132 | |
e7a22c1e | 1133 | #ifdef CONFIG_NUMA |
e534c7c5 LS |
1134 | if (cpu != 0 && percpu_read(numa_node) == 0 && |
1135 | early_cpu_to_node(cpu) != NUMA_NO_NODE) | |
1136 | set_numa_node(early_cpu_to_node(cpu)); | |
e7a22c1e | 1137 | #endif |
1ba76586 YL |
1138 | |
1139 | me = current; | |
1140 | ||
c2d1cec1 | 1141 | if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) |
1ba76586 YL |
1142 | panic("CPU#%d already initialized!\n", cpu); |
1143 | ||
2eaad1fd | 1144 | pr_debug("Initializing CPU#%d\n", cpu); |
1ba76586 YL |
1145 | |
1146 | clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); | |
1147 | ||
1148 | /* | |
1149 | * Initialize the per-CPU GDT with the boot GDT, | |
1150 | * and set up the GDT descriptor: | |
1151 | */ | |
1152 | ||
552be871 | 1153 | switch_to_new_gdt(cpu); |
2697fbd5 BG |
1154 | loadsegment(fs, 0); |
1155 | ||
1ba76586 YL |
1156 | load_idt((const struct desc_ptr *)&idt_descr); |
1157 | ||
1158 | memset(me->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8); | |
1159 | syscall_init(); | |
1160 | ||
1161 | wrmsrl(MSR_FS_BASE, 0); | |
1162 | wrmsrl(MSR_KERNEL_GS_BASE, 0); | |
1163 | barrier(); | |
1164 | ||
4763ed4d | 1165 | x86_configure_nx(); |
06cd9a7d | 1166 | if (cpu != 0) |
1ba76586 YL |
1167 | enable_x2apic(); |
1168 | ||
1169 | /* | |
1170 | * set up and load the per-CPU TSS | |
1171 | */ | |
0fe1e009 | 1172 | if (!oist->ist[0]) { |
92d65b23 | 1173 | char *estacks = per_cpu(exception_stacks, cpu); |
0f3fa48a | 1174 | |
1ba76586 | 1175 | for (v = 0; v < N_EXCEPTION_STACKS; v++) { |
0f3fa48a | 1176 | estacks += exception_stack_sizes[v]; |
0fe1e009 | 1177 | oist->ist[v] = t->x86_tss.ist[v] = |
1ba76586 YL |
1178 | (unsigned long)estacks; |
1179 | } | |
1180 | } | |
1181 | ||
1182 | t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap); | |
0f3fa48a | 1183 | |
1ba76586 YL |
1184 | /* |
1185 | * <= is required because the CPU will access up to | |
1186 | * 8 bits beyond the end of the IO permission bitmap. | |
1187 | */ | |
1188 | for (i = 0; i <= IO_BITMAP_LONGS; i++) | |
1189 | t->io_bitmap[i] = ~0UL; | |
1190 | ||
1191 | atomic_inc(&init_mm.mm_count); | |
1192 | me->active_mm = &init_mm; | |
8c5dfd25 | 1193 | BUG_ON(me->mm); |
1ba76586 YL |
1194 | enter_lazy_tlb(&init_mm, me); |
1195 | ||
1196 | load_sp0(t, ¤t->thread); | |
1197 | set_tss_desc(cpu, t); | |
1198 | load_TR_desc(); | |
1199 | load_LDT(&init_mm.context); | |
1200 | ||
0bb9fef9 JW |
1201 | clear_all_debug_regs(); |
1202 | dbg_restore_debug_regs(); | |
1ba76586 YL |
1203 | |
1204 | fpu_init(); | |
1205 | ||
1206 | raw_local_save_flags(kernel_eflags); | |
1207 | ||
1208 | if (is_uv_system()) | |
1209 | uv_cpu_init(); | |
1210 | } | |
1211 | ||
1212 | #else | |
1213 | ||
d2cbcc49 | 1214 | void __cpuinit cpu_init(void) |
9ee79a3d | 1215 | { |
d2cbcc49 RR |
1216 | int cpu = smp_processor_id(); |
1217 | struct task_struct *curr = current; | |
34048c9e | 1218 | struct tss_struct *t = &per_cpu(init_tss, cpu); |
9ee79a3d | 1219 | struct thread_struct *thread = &curr->thread; |
62111195 | 1220 | |
c2d1cec1 | 1221 | if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) { |
62111195 | 1222 | printk(KERN_WARNING "CPU#%d already initialized!\n", cpu); |
9766cdbc JSR |
1223 | for (;;) |
1224 | local_irq_enable(); | |
62111195 JF |
1225 | } |
1226 | ||
1227 | printk(KERN_INFO "Initializing CPU#%d\n", cpu); | |
1228 | ||
1229 | if (cpu_has_vme || cpu_has_tsc || cpu_has_de) | |
1230 | clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); | |
62111195 | 1231 | |
4d37e7e3 | 1232 | load_idt(&idt_descr); |
552be871 | 1233 | switch_to_new_gdt(cpu); |
1da177e4 | 1234 | |
1da177e4 LT |
1235 | /* |
1236 | * Set up and load the per-CPU TSS and LDT | |
1237 | */ | |
1238 | atomic_inc(&init_mm.mm_count); | |
62111195 | 1239 | curr->active_mm = &init_mm; |
8c5dfd25 | 1240 | BUG_ON(curr->mm); |
62111195 | 1241 | enter_lazy_tlb(&init_mm, curr); |
1da177e4 | 1242 | |
faca6227 | 1243 | load_sp0(t, thread); |
34048c9e | 1244 | set_tss_desc(cpu, t); |
1da177e4 LT |
1245 | load_TR_desc(); |
1246 | load_LDT(&init_mm.context); | |
1247 | ||
f9a196b8 TG |
1248 | t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap); |
1249 | ||
22c4e308 | 1250 | #ifdef CONFIG_DOUBLEFAULT |
1da177e4 LT |
1251 | /* Set up doublefault TSS pointer in the GDT */ |
1252 | __set_tss_desc(cpu, GDT_ENTRY_DOUBLEFAULT_TSS, &doublefault_tss); | |
22c4e308 | 1253 | #endif |
1da177e4 | 1254 | |
9766cdbc | 1255 | clear_all_debug_regs(); |
0bb9fef9 | 1256 | dbg_restore_debug_regs(); |
1da177e4 LT |
1257 | |
1258 | /* | |
1259 | * Force FPU initialization: | |
1260 | */ | |
c9ad4882 | 1261 | current_thread_info()->status = 0; |
1da177e4 LT |
1262 | clear_used_math(); |
1263 | mxcsr_feature_mask_init(); | |
dc1e35c6 SS |
1264 | |
1265 | /* | |
1266 | * Boot processor to setup the FP and extended state context info. | |
1267 | */ | |
b3572e36 | 1268 | if (smp_processor_id() == boot_cpu_id) |
dc1e35c6 SS |
1269 | init_thread_xstate(); |
1270 | ||
1271 | xsave_init(); | |
1da177e4 | 1272 | } |
1ba76586 | 1273 | #endif |