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1da177e4 LT |
1 | #include <linux/init.h> |
2 | #include <linux/kernel.h> | |
3 | ||
4 | #include <linux/string.h> | |
5 | #include <linux/bitops.h> | |
6 | #include <linux/smp.h> | |
7 | #include <linux/thread_info.h> | |
53e86b91 | 8 | #include <linux/module.h> |
1da177e4 LT |
9 | |
10 | #include <asm/processor.h> | |
d72b1b4f | 11 | #include <asm/pgtable.h> |
1da177e4 LT |
12 | #include <asm/msr.h> |
13 | #include <asm/uaccess.h> | |
eee3af4a | 14 | #include <asm/ds.h> |
73bdb73f | 15 | #include <asm/bugs.h> |
1da177e4 | 16 | |
185f3b9d YL |
17 | #ifdef CONFIG_X86_64 |
18 | #include <asm/topology.h> | |
19 | #include <asm/numa_64.h> | |
20 | #endif | |
21 | ||
1da177e4 LT |
22 | #include "cpu.h" |
23 | ||
24 | #ifdef CONFIG_X86_LOCAL_APIC | |
25 | #include <asm/mpspec.h> | |
26 | #include <asm/apic.h> | |
1dcdd3d1 | 27 | #include <asm/genapic.h> |
1da177e4 LT |
28 | #endif |
29 | ||
03ae5768 | 30 | static void __cpuinit early_init_intel(struct cpuinfo_x86 *c) |
1da177e4 | 31 | { |
99fb4d34 | 32 | /* Unmask CPUID levels if masked: */ |
30a0fb94 | 33 | if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) { |
99fb4d34 | 34 | u64 misc_enable; |
066941bd | 35 | |
99fb4d34 IM |
36 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable); |
37 | ||
38 | if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) { | |
39 | misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID; | |
40 | wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable); | |
41 | c->cpuid_level = cpuid_eax(0); | |
42 | } | |
066941bd PA |
43 | } |
44 | ||
2b16a235 AK |
45 | if ((c->x86 == 0xf && c->x86_model >= 0x03) || |
46 | (c->x86 == 0x6 && c->x86_model >= 0x0e)) | |
47 | set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); | |
185f3b9d YL |
48 | |
49 | #ifdef CONFIG_X86_64 | |
50 | set_cpu_cap(c, X86_FEATURE_SYSENTER32); | |
51 | #else | |
52 | /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */ | |
53 | if (c->x86 == 15 && c->x86_cache_alignment == 64) | |
54 | c->x86_cache_alignment = 128; | |
55 | #endif | |
40fb1715 VP |
56 | |
57 | /* | |
58 | * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate | |
59 | * with P/T states and does not stop in deep C-states | |
60 | */ | |
61 | if (c->x86_power & (1 << 8)) { | |
62 | set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); | |
63 | set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC); | |
64 | } | |
65 | ||
75a04811 PA |
66 | /* |
67 | * There is a known erratum on Pentium III and Core Solo | |
68 | * and Core Duo CPUs. | |
69 | * " Page with PAT set to WC while associated MTRR is UC | |
70 | * may consolidate to UC " | |
71 | * Because of this erratum, it is better to stick with | |
72 | * setting WC in MTRR rather than using PAT on these CPUs. | |
73 | * | |
74 | * Enable PAT WC only on P4, Core 2 or later CPUs. | |
75 | */ | |
76 | if (c->x86 == 6 && c->x86_model < 15) | |
77 | clear_cpu_cap(c, X86_FEATURE_PAT); | |
1da177e4 LT |
78 | } |
79 | ||
185f3b9d | 80 | #ifdef CONFIG_X86_32 |
1da177e4 LT |
81 | /* |
82 | * Early probe support logic for ppro memory erratum #50 | |
83 | * | |
84 | * This is called before we do cpu ident work | |
85 | */ | |
65eb6b43 | 86 | |
3bc9b76b | 87 | int __cpuinit ppro_with_ram_bug(void) |
1da177e4 LT |
88 | { |
89 | /* Uses data from early_cpu_detect now */ | |
90 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
91 | boot_cpu_data.x86 == 6 && | |
92 | boot_cpu_data.x86_model == 1 && | |
93 | boot_cpu_data.x86_mask < 8) { | |
94 | printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n"); | |
95 | return 1; | |
96 | } | |
97 | return 0; | |
98 | } | |
65eb6b43 | 99 | |
4052704d YL |
100 | #ifdef CONFIG_X86_F00F_BUG |
101 | static void __cpuinit trap_init_f00f_bug(void) | |
102 | { | |
103 | __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO); | |
1da177e4 | 104 | |
4052704d YL |
105 | /* |
106 | * Update the IDT descriptor and reload the IDT so that | |
107 | * it uses the read-only mapped virtual address. | |
108 | */ | |
109 | idt_descr.address = fix_to_virt(FIX_F00F_IDT); | |
110 | load_idt(&idt_descr); | |
111 | } | |
112 | #endif | |
113 | ||
114 | static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c) | |
1da177e4 LT |
115 | { |
116 | unsigned long lo, hi; | |
117 | ||
4052704d YL |
118 | #ifdef CONFIG_X86_F00F_BUG |
119 | /* | |
120 | * All current models of Pentium and Pentium with MMX technology CPUs | |
121 | * have the F0 0F bug, which lets nonprivileged users lock up the system. | |
122 | * Note that the workaround only should be initialized once... | |
123 | */ | |
124 | c->f00f_bug = 0; | |
125 | if (!paravirt_enabled() && c->x86 == 5) { | |
126 | static int f00f_workaround_enabled; | |
127 | ||
128 | c->f00f_bug = 1; | |
129 | if (!f00f_workaround_enabled) { | |
130 | trap_init_f00f_bug(); | |
131 | printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n"); | |
132 | f00f_workaround_enabled = 1; | |
133 | } | |
134 | } | |
135 | #endif | |
136 | ||
137 | /* | |
138 | * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until | |
139 | * model 3 mask 3 | |
140 | */ | |
141 | if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633) | |
142 | clear_cpu_cap(c, X86_FEATURE_SEP); | |
143 | ||
144 | /* | |
145 | * P4 Xeon errata 037 workaround. | |
146 | * Hardware prefetcher may cause stale data to be loaded into the cache. | |
147 | */ | |
1da177e4 | 148 | if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) { |
65eb6b43 | 149 | rdmsr(MSR_IA32_MISC_ENABLE, lo, hi); |
1da177e4 LT |
150 | if ((lo & (1<<9)) == 0) { |
151 | printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n"); | |
152 | printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n"); | |
153 | lo |= (1<<9); /* Disable hw prefetching */ | |
154 | wrmsr (MSR_IA32_MISC_ENABLE, lo, hi); | |
155 | } | |
156 | } | |
1da177e4 | 157 | |
4052704d YL |
158 | /* |
159 | * See if we have a good local APIC by checking for buggy Pentia, | |
160 | * i.e. all B steppings and the C2 stepping of P54C when using their | |
161 | * integrated APIC (see 11AP erratum in "Pentium Processor | |
162 | * Specification Update"). | |
163 | */ | |
164 | if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 && | |
165 | (c->x86_mask < 0x6 || c->x86_mask == 0xb)) | |
166 | set_cpu_cap(c, X86_FEATURE_11AP); | |
185f3b9d | 167 | |
185f3b9d | 168 | |
4052704d | 169 | #ifdef CONFIG_X86_INTEL_USERCOPY |
185f3b9d | 170 | /* |
4052704d | 171 | * Set up the preferred alignment for movsl bulk memory moves |
185f3b9d | 172 | */ |
4052704d YL |
173 | switch (c->x86) { |
174 | case 4: /* 486: untested */ | |
175 | break; | |
176 | case 5: /* Old Pentia: untested */ | |
177 | break; | |
178 | case 6: /* PII/PIII only like movsl with 8-byte alignment */ | |
179 | movsl_mask.mask = 7; | |
180 | break; | |
181 | case 15: /* P4 is OK down to 8-byte alignment */ | |
182 | movsl_mask.mask = 7; | |
183 | break; | |
184 | } | |
185f3b9d | 185 | #endif |
4052704d YL |
186 | |
187 | #ifdef CONFIG_X86_NUMAQ | |
188 | numaq_tsc_disable(); | |
189 | #endif | |
190 | } | |
191 | #else | |
192 | static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c) | |
193 | { | |
194 | } | |
185f3b9d YL |
195 | #endif |
196 | ||
197 | static void __cpuinit srat_detect_node(void) | |
198 | { | |
199 | #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64) | |
200 | unsigned node; | |
201 | int cpu = smp_processor_id(); | |
202 | int apicid = hard_smp_processor_id(); | |
203 | ||
204 | /* Don't do the funky fallback heuristics the AMD version employs | |
205 | for now. */ | |
206 | node = apicid_to_node[apicid]; | |
207 | if (node == NUMA_NO_NODE || !node_online(node)) | |
208 | node = first_node(node_online_map); | |
209 | numa_set_node(cpu, node); | |
210 | ||
823b259b | 211 | printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node); |
185f3b9d YL |
212 | #endif |
213 | } | |
214 | ||
3dd9d514 AK |
215 | /* |
216 | * find out the number of processor cores on the die | |
217 | */ | |
f69feff7 | 218 | static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c) |
3dd9d514 | 219 | { |
f2ab4461 | 220 | unsigned int eax, ebx, ecx, edx; |
3dd9d514 AK |
221 | |
222 | if (c->cpuid_level < 4) | |
223 | return 1; | |
224 | ||
f2ab4461 ZA |
225 | /* Intel has a non-standard dependency on %ecx for this CPUID level. */ |
226 | cpuid_count(4, 0, &eax, &ebx, &ecx, &edx); | |
3dd9d514 AK |
227 | if (eax & 0x1f) |
228 | return ((eax >> 26) + 1); | |
229 | else | |
230 | return 1; | |
231 | } | |
232 | ||
e38e05a8 SY |
233 | static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c) |
234 | { | |
235 | /* Intel VMX MSR indicated features */ | |
236 | #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000 | |
237 | #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000 | |
238 | #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000 | |
239 | #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001 | |
240 | #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002 | |
241 | #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020 | |
242 | ||
243 | u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2; | |
244 | ||
245 | clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW); | |
246 | clear_cpu_cap(c, X86_FEATURE_VNMI); | |
247 | clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY); | |
248 | clear_cpu_cap(c, X86_FEATURE_EPT); | |
249 | clear_cpu_cap(c, X86_FEATURE_VPID); | |
250 | ||
251 | rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high); | |
252 | msr_ctl = vmx_msr_high | vmx_msr_low; | |
253 | if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW) | |
254 | set_cpu_cap(c, X86_FEATURE_TPR_SHADOW); | |
255 | if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI) | |
256 | set_cpu_cap(c, X86_FEATURE_VNMI); | |
257 | if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) { | |
258 | rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, | |
259 | vmx_msr_low, vmx_msr_high); | |
260 | msr_ctl2 = vmx_msr_high | vmx_msr_low; | |
261 | if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) && | |
262 | (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)) | |
263 | set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY); | |
264 | if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT) | |
265 | set_cpu_cap(c, X86_FEATURE_EPT); | |
266 | if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID) | |
267 | set_cpu_cap(c, X86_FEATURE_VPID); | |
268 | } | |
269 | } | |
270 | ||
3bc9b76b | 271 | static void __cpuinit init_intel(struct cpuinfo_x86 *c) |
1da177e4 LT |
272 | { |
273 | unsigned int l2 = 0; | |
1da177e4 | 274 | |
2b16a235 AK |
275 | early_init_intel(c); |
276 | ||
4052704d | 277 | intel_workarounds(c); |
1da177e4 | 278 | |
345077cd SS |
279 | /* |
280 | * Detect the extended topology information if available. This | |
281 | * will reinitialise the initial_apicid which will be used | |
282 | * in init_intel_cacheinfo() | |
283 | */ | |
284 | detect_extended_topology(c); | |
285 | ||
1da177e4 | 286 | l2 = init_intel_cacheinfo(c); |
65eb6b43 | 287 | if (c->cpuid_level > 9) { |
0080e667 VP |
288 | unsigned eax = cpuid_eax(10); |
289 | /* Check for version and the number of counters */ | |
290 | if ((eax & 0xff) && (((eax>>8) & 0xff) > 1)) | |
d0e95ebd | 291 | set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON); |
0080e667 | 292 | } |
1da177e4 | 293 | |
4052704d YL |
294 | if (cpu_has_xmm2) |
295 | set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC); | |
296 | if (cpu_has_ds) { | |
297 | unsigned int l1; | |
298 | rdmsr(MSR_IA32_MISC_ENABLE, l1, l2); | |
299 | if (!(l1 & (1<<11))) | |
300 | set_cpu_cap(c, X86_FEATURE_BTS); | |
301 | if (!(l1 & (1<<12))) | |
302 | set_cpu_cap(c, X86_FEATURE_PEBS); | |
303 | ds_init_intel(c); | |
304 | } | |
1da177e4 | 305 | |
e736ad54 PV |
306 | if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush) |
307 | set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR); | |
308 | ||
4052704d YL |
309 | #ifdef CONFIG_X86_64 |
310 | if (c->x86 == 15) | |
311 | c->x86_cache_alignment = c->x86_clflush_size * 2; | |
312 | if (c->x86 == 6) | |
313 | set_cpu_cap(c, X86_FEATURE_REP_GOOD); | |
314 | #else | |
65eb6b43 PC |
315 | /* |
316 | * Names for the Pentium II/Celeron processors | |
317 | * detectable only by also checking the cache size. | |
318 | * Dixon is NOT a Celeron. | |
319 | */ | |
1da177e4 | 320 | if (c->x86 == 6) { |
4052704d YL |
321 | char *p = NULL; |
322 | ||
1da177e4 LT |
323 | switch (c->x86_model) { |
324 | case 5: | |
325 | if (c->x86_mask == 0) { | |
326 | if (l2 == 0) | |
327 | p = "Celeron (Covington)"; | |
328 | else if (l2 == 256) | |
329 | p = "Mobile Pentium II (Dixon)"; | |
330 | } | |
331 | break; | |
65eb6b43 | 332 | |
1da177e4 LT |
333 | case 6: |
334 | if (l2 == 128) | |
335 | p = "Celeron (Mendocino)"; | |
336 | else if (c->x86_mask == 0 || c->x86_mask == 5) | |
337 | p = "Celeron-A"; | |
338 | break; | |
65eb6b43 | 339 | |
1da177e4 LT |
340 | case 8: |
341 | if (l2 == 128) | |
342 | p = "Celeron (Coppermine)"; | |
343 | break; | |
344 | } | |
1da177e4 | 345 | |
4052704d YL |
346 | if (p) |
347 | strcpy(c->x86_model_id, p); | |
1da177e4 | 348 | } |
1da177e4 | 349 | |
185f3b9d YL |
350 | if (c->x86 == 15) |
351 | set_cpu_cap(c, X86_FEATURE_P4); | |
352 | if (c->x86 == 6) | |
353 | set_cpu_cap(c, X86_FEATURE_P3); | |
f4166c54 | 354 | #endif |
185f3b9d | 355 | |
185f3b9d YL |
356 | if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) { |
357 | /* | |
358 | * let's use the legacy cpuid vector 0x1 and 0x4 for topology | |
359 | * detection. | |
360 | */ | |
361 | c->x86_max_cores = intel_num_cpu_cores(c); | |
362 | #ifdef CONFIG_X86_32 | |
363 | detect_ht(c); | |
364 | #endif | |
365 | } | |
366 | ||
367 | /* Work around errata */ | |
368 | srat_detect_node(); | |
e38e05a8 SY |
369 | |
370 | if (cpu_has(c, X86_FEATURE_VMX)) | |
371 | detect_vmx_virtcap(c); | |
42ed458a | 372 | } |
1da177e4 | 373 | |
185f3b9d | 374 | #ifdef CONFIG_X86_32 |
65eb6b43 | 375 | static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size) |
1da177e4 | 376 | { |
65eb6b43 PC |
377 | /* |
378 | * Intel PIII Tualatin. This comes in two flavours. | |
1da177e4 LT |
379 | * One has 256kb of cache, the other 512. We have no way |
380 | * to determine which, so we use a boottime override | |
381 | * for the 512kb model, and assume 256 otherwise. | |
382 | */ | |
383 | if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0)) | |
384 | size = 256; | |
385 | return size; | |
386 | } | |
185f3b9d | 387 | #endif |
1da177e4 | 388 | |
3bc9b76b | 389 | static struct cpu_dev intel_cpu_dev __cpuinitdata = { |
1da177e4 | 390 | .c_vendor = "Intel", |
65eb6b43 | 391 | .c_ident = { "GenuineIntel" }, |
185f3b9d | 392 | #ifdef CONFIG_X86_32 |
1da177e4 | 393 | .c_models = { |
65eb6b43 PC |
394 | { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names = |
395 | { | |
396 | [0] = "486 DX-25/33", | |
397 | [1] = "486 DX-50", | |
398 | [2] = "486 SX", | |
399 | [3] = "486 DX/2", | |
400 | [4] = "486 SL", | |
401 | [5] = "486 SX/2", | |
402 | [7] = "486 DX/2-WB", | |
403 | [8] = "486 DX/4", | |
1da177e4 LT |
404 | [9] = "486 DX/4-WB" |
405 | } | |
406 | }, | |
407 | { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names = | |
65eb6b43 PC |
408 | { |
409 | [0] = "Pentium 60/66 A-step", | |
410 | [1] = "Pentium 60/66", | |
1da177e4 | 411 | [2] = "Pentium 75 - 200", |
65eb6b43 | 412 | [3] = "OverDrive PODP5V83", |
1da177e4 | 413 | [4] = "Pentium MMX", |
65eb6b43 | 414 | [7] = "Mobile Pentium 75 - 200", |
1da177e4 LT |
415 | [8] = "Mobile Pentium MMX" |
416 | } | |
417 | }, | |
418 | { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names = | |
65eb6b43 | 419 | { |
1da177e4 | 420 | [0] = "Pentium Pro A-step", |
65eb6b43 PC |
421 | [1] = "Pentium Pro", |
422 | [3] = "Pentium II (Klamath)", | |
423 | [4] = "Pentium II (Deschutes)", | |
424 | [5] = "Pentium II (Deschutes)", | |
1da177e4 | 425 | [6] = "Mobile Pentium II", |
65eb6b43 PC |
426 | [7] = "Pentium III (Katmai)", |
427 | [8] = "Pentium III (Coppermine)", | |
1da177e4 LT |
428 | [10] = "Pentium III (Cascades)", |
429 | [11] = "Pentium III (Tualatin)", | |
430 | } | |
431 | }, | |
432 | { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names = | |
433 | { | |
434 | [0] = "Pentium 4 (Unknown)", | |
435 | [1] = "Pentium 4 (Willamette)", | |
436 | [2] = "Pentium 4 (Northwood)", | |
437 | [4] = "Pentium 4 (Foster)", | |
438 | [5] = "Pentium 4 (Foster)", | |
439 | } | |
440 | }, | |
441 | }, | |
185f3b9d YL |
442 | .c_size_cache = intel_size_cache, |
443 | #endif | |
03ae5768 | 444 | .c_early_init = early_init_intel, |
1da177e4 | 445 | .c_init = init_intel, |
10a434fc | 446 | .c_x86_vendor = X86_VENDOR_INTEL, |
1da177e4 LT |
447 | }; |
448 | ||
10a434fc | 449 | cpu_dev_register(intel_cpu_dev); |
1da177e4 | 450 |