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69c60c88 | 1 | #include <linux/export.h> |
1da177e4 | 2 | #include <linux/bitops.h> |
5cdd174f | 3 | #include <linux/elf.h> |
1da177e4 | 4 | #include <linux/mm.h> |
8d71a2ea | 5 | |
8bdbd962 | 6 | #include <linux/io.h> |
c98fdeaa | 7 | #include <linux/sched.h> |
4e26d11f | 8 | #include <linux/random.h> |
1da177e4 | 9 | #include <asm/processor.h> |
d3f7eae1 | 10 | #include <asm/apic.h> |
1f442d70 | 11 | #include <asm/cpu.h> |
26bfa5f8 | 12 | #include <asm/smp.h> |
42937e81 | 13 | #include <asm/pci-direct.h> |
b466bdb6 | 14 | #include <asm/delay.h> |
1da177e4 | 15 | |
8d71a2ea | 16 | #ifdef CONFIG_X86_64 |
8d71a2ea YL |
17 | # include <asm/mmconfig.h> |
18 | # include <asm/cacheflush.h> | |
19 | #endif | |
20 | ||
1da177e4 LT |
21 | #include "cpu.h" |
22 | ||
3344ed30 TG |
23 | static const int amd_erratum_383[]; |
24 | static const int amd_erratum_400[]; | |
25 | static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum); | |
26 | ||
cc2749e4 AG |
27 | /* |
28 | * nodes_per_socket: Stores the number of nodes per socket. | |
29 | * Refer to Fam15h Models 00-0fh BKDG - CPUID Fn8000_001E_ECX | |
30 | * Node Identifiers[10:8] | |
31 | */ | |
32 | static u32 nodes_per_socket = 1; | |
33 | ||
2c929ce6 BP |
34 | static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p) |
35 | { | |
2c929ce6 BP |
36 | u32 gprs[8] = { 0 }; |
37 | int err; | |
38 | ||
682469a5 BP |
39 | WARN_ONCE((boot_cpu_data.x86 != 0xf), |
40 | "%s should only be used on K8!\n", __func__); | |
2c929ce6 BP |
41 | |
42 | gprs[1] = msr; | |
43 | gprs[7] = 0x9c5a203a; | |
44 | ||
45 | err = rdmsr_safe_regs(gprs); | |
46 | ||
47 | *p = gprs[0] | ((u64)gprs[2] << 32); | |
48 | ||
49 | return err; | |
50 | } | |
51 | ||
52 | static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val) | |
53 | { | |
2c929ce6 BP |
54 | u32 gprs[8] = { 0 }; |
55 | ||
682469a5 BP |
56 | WARN_ONCE((boot_cpu_data.x86 != 0xf), |
57 | "%s should only be used on K8!\n", __func__); | |
2c929ce6 BP |
58 | |
59 | gprs[0] = (u32)val; | |
60 | gprs[1] = msr; | |
61 | gprs[2] = val >> 32; | |
62 | gprs[7] = 0x9c5a203a; | |
63 | ||
64 | return wrmsr_safe_regs(gprs); | |
65 | } | |
66 | ||
1da177e4 LT |
67 | /* |
68 | * B step AMD K6 before B 9730xxxx have hardware bugs that can cause | |
69 | * misexecution of code under Linux. Owners of such processors should | |
70 | * contact AMD for precise details and a CPU swap. | |
71 | * | |
72 | * See http://www.multimania.com/poulot/k6bug.html | |
d7de8649 AH |
73 | * and section 2.6.2 of "AMD-K6 Processor Revision Guide - Model 6" |
74 | * (Publication # 21266 Issue Date: August 1998) | |
1da177e4 LT |
75 | * |
76 | * The following test is erm.. interesting. AMD neglected to up | |
77 | * the chip setting when fixing the bug but they also tweaked some | |
78 | * performance at the same time.. | |
79 | */ | |
fb87a298 | 80 | |
277d5b40 | 81 | extern __visible void vide(void); |
de642faf JP |
82 | __asm__(".globl vide\n" |
83 | ".type vide, @function\n" | |
84 | ".align 4\n" | |
85 | "vide: ret\n"); | |
1da177e4 | 86 | |
148f9bb8 | 87 | static void init_amd_k5(struct cpuinfo_x86 *c) |
11fdd252 | 88 | { |
26bfa5f8 | 89 | #ifdef CONFIG_X86_32 |
11fdd252 YL |
90 | /* |
91 | * General Systems BIOSen alias the cpu frequency registers | |
6a6256f9 | 92 | * of the Elan at 0x000df000. Unfortunately, one of the Linux |
11fdd252 YL |
93 | * drivers subsequently pokes it, and changes the CPU speed. |
94 | * Workaround : Remove the unneeded alias. | |
95 | */ | |
96 | #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */ | |
97 | #define CBAR_ENB (0x80000000) | |
98 | #define CBAR_KEY (0X000000CB) | |
99 | if (c->x86_model == 9 || c->x86_model == 10) { | |
8bdbd962 AC |
100 | if (inl(CBAR) & CBAR_ENB) |
101 | outl(0 | CBAR_KEY, CBAR); | |
11fdd252 | 102 | } |
26bfa5f8 | 103 | #endif |
11fdd252 YL |
104 | } |
105 | ||
148f9bb8 | 106 | static void init_amd_k6(struct cpuinfo_x86 *c) |
11fdd252 | 107 | { |
26bfa5f8 | 108 | #ifdef CONFIG_X86_32 |
11fdd252 | 109 | u32 l, h; |
46a84132 | 110 | int mbytes = get_num_physpages() >> (20-PAGE_SHIFT); |
11fdd252 YL |
111 | |
112 | if (c->x86_model < 6) { | |
113 | /* Based on AMD doc 20734R - June 2000 */ | |
114 | if (c->x86_model == 0) { | |
115 | clear_cpu_cap(c, X86_FEATURE_APIC); | |
116 | set_cpu_cap(c, X86_FEATURE_PGE); | |
117 | } | |
118 | return; | |
119 | } | |
120 | ||
121 | if (c->x86_model == 6 && c->x86_mask == 1) { | |
122 | const int K6_BUG_LOOP = 1000000; | |
123 | int n; | |
124 | void (*f_vide)(void); | |
37963666 | 125 | u64 d, d2; |
11fdd252 | 126 | |
1b74dde7 | 127 | pr_info("AMD K6 stepping B detected - "); |
11fdd252 YL |
128 | |
129 | /* | |
130 | * It looks like AMD fixed the 2.6.2 bug and improved indirect | |
131 | * calls at the same time. | |
132 | */ | |
133 | ||
134 | n = K6_BUG_LOOP; | |
135 | f_vide = vide; | |
4ea1636b | 136 | d = rdtsc(); |
11fdd252 YL |
137 | while (n--) |
138 | f_vide(); | |
4ea1636b | 139 | d2 = rdtsc(); |
11fdd252 YL |
140 | d = d2-d; |
141 | ||
142 | if (d > 20*K6_BUG_LOOP) | |
1b74dde7 | 143 | pr_cont("system stability may be impaired when more than 32 MB are used.\n"); |
11fdd252 | 144 | else |
1b74dde7 | 145 | pr_cont("probably OK (after B9730xxxx).\n"); |
11fdd252 YL |
146 | } |
147 | ||
148 | /* K6 with old style WHCR */ | |
149 | if (c->x86_model < 8 || | |
150 | (c->x86_model == 8 && c->x86_mask < 8)) { | |
151 | /* We can only write allocate on the low 508Mb */ | |
152 | if (mbytes > 508) | |
153 | mbytes = 508; | |
154 | ||
155 | rdmsr(MSR_K6_WHCR, l, h); | |
156 | if ((l&0x0000FFFF) == 0) { | |
157 | unsigned long flags; | |
158 | l = (1<<0)|((mbytes/4)<<1); | |
159 | local_irq_save(flags); | |
160 | wbinvd(); | |
161 | wrmsr(MSR_K6_WHCR, l, h); | |
162 | local_irq_restore(flags); | |
1b74dde7 | 163 | pr_info("Enabling old style K6 write allocation for %d Mb\n", |
11fdd252 YL |
164 | mbytes); |
165 | } | |
166 | return; | |
167 | } | |
168 | ||
169 | if ((c->x86_model == 8 && c->x86_mask > 7) || | |
170 | c->x86_model == 9 || c->x86_model == 13) { | |
171 | /* The more serious chips .. */ | |
172 | ||
173 | if (mbytes > 4092) | |
174 | mbytes = 4092; | |
175 | ||
176 | rdmsr(MSR_K6_WHCR, l, h); | |
177 | if ((l&0xFFFF0000) == 0) { | |
178 | unsigned long flags; | |
179 | l = ((mbytes>>2)<<22)|(1<<16); | |
180 | local_irq_save(flags); | |
181 | wbinvd(); | |
182 | wrmsr(MSR_K6_WHCR, l, h); | |
183 | local_irq_restore(flags); | |
1b74dde7 | 184 | pr_info("Enabling new style K6 write allocation for %d Mb\n", |
11fdd252 YL |
185 | mbytes); |
186 | } | |
187 | ||
188 | return; | |
189 | } | |
190 | ||
191 | if (c->x86_model == 10) { | |
192 | /* AMD Geode LX is model 10 */ | |
193 | /* placeholder for any needed mods */ | |
194 | return; | |
195 | } | |
26bfa5f8 | 196 | #endif |
11fdd252 YL |
197 | } |
198 | ||
26bfa5f8 | 199 | static void init_amd_k7(struct cpuinfo_x86 *c) |
1f442d70 | 200 | { |
26bfa5f8 BP |
201 | #ifdef CONFIG_X86_32 |
202 | u32 l, h; | |
203 | ||
204 | /* | |
205 | * Bit 15 of Athlon specific MSR 15, needs to be 0 | |
206 | * to enable SSE on Palomino/Morgan/Barton CPU's. | |
207 | * If the BIOS didn't enable it already, enable it here. | |
208 | */ | |
209 | if (c->x86_model >= 6 && c->x86_model <= 10) { | |
210 | if (!cpu_has(c, X86_FEATURE_XMM)) { | |
1b74dde7 | 211 | pr_info("Enabling disabled K7/SSE Support.\n"); |
26bfa5f8 BP |
212 | msr_clear_bit(MSR_K7_HWCR, 15); |
213 | set_cpu_cap(c, X86_FEATURE_XMM); | |
214 | } | |
215 | } | |
216 | ||
217 | /* | |
218 | * It's been determined by AMD that Athlons since model 8 stepping 1 | |
219 | * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx | |
220 | * As per AMD technical note 27212 0.2 | |
221 | */ | |
222 | if ((c->x86_model == 8 && c->x86_mask >= 1) || (c->x86_model > 8)) { | |
223 | rdmsr(MSR_K7_CLK_CTL, l, h); | |
224 | if ((l & 0xfff00000) != 0x20000000) { | |
1b74dde7 CY |
225 | pr_info("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n", |
226 | l, ((l & 0x000fffff)|0x20000000)); | |
26bfa5f8 BP |
227 | wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h); |
228 | } | |
229 | } | |
230 | ||
231 | set_cpu_cap(c, X86_FEATURE_K7); | |
232 | ||
1f442d70 | 233 | /* calling is from identify_secondary_cpu() ? */ |
f6e9456c | 234 | if (!c->cpu_index) |
1f442d70 YL |
235 | return; |
236 | ||
237 | /* | |
238 | * Certain Athlons might work (for various values of 'work') in SMP | |
239 | * but they are not certified as MP capable. | |
240 | */ | |
241 | /* Athlon 660/661 is valid. */ | |
242 | if ((c->x86_model == 6) && ((c->x86_mask == 0) || | |
243 | (c->x86_mask == 1))) | |
1077c932 | 244 | return; |
1f442d70 YL |
245 | |
246 | /* Duron 670 is valid */ | |
247 | if ((c->x86_model == 7) && (c->x86_mask == 0)) | |
1077c932 | 248 | return; |
1f442d70 YL |
249 | |
250 | /* | |
251 | * Athlon 662, Duron 671, and Athlon >model 7 have capability | |
252 | * bit. It's worth noting that the A5 stepping (662) of some | |
253 | * Athlon XP's have the MP bit set. | |
254 | * See http://www.heise.de/newsticker/data/jow-18.10.01-000 for | |
255 | * more. | |
256 | */ | |
257 | if (((c->x86_model == 6) && (c->x86_mask >= 2)) || | |
258 | ((c->x86_model == 7) && (c->x86_mask >= 1)) || | |
259 | (c->x86_model > 7)) | |
26bfa5f8 | 260 | if (cpu_has(c, X86_FEATURE_MP)) |
1077c932 | 261 | return; |
1f442d70 YL |
262 | |
263 | /* If we get here, not a certified SMP capable AMD system. */ | |
264 | ||
265 | /* | |
266 | * Don't taint if we are running SMP kernel on a single non-MP | |
267 | * approved Athlon | |
268 | */ | |
269 | WARN_ONCE(1, "WARNING: This combination of AMD" | |
7da8b6dd | 270 | " processors is not suitable for SMP.\n"); |
8c90487c | 271 | add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE); |
6c62aa4a | 272 | #endif |
26bfa5f8 | 273 | } |
6c62aa4a | 274 | |
645a7919 | 275 | #ifdef CONFIG_NUMA |
bbc9e2f4 TH |
276 | /* |
277 | * To workaround broken NUMA config. Read the comment in | |
278 | * srat_detect_node(). | |
279 | */ | |
148f9bb8 | 280 | static int nearby_node(int apicid) |
6c62aa4a YL |
281 | { |
282 | int i, node; | |
283 | ||
284 | for (i = apicid - 1; i >= 0; i--) { | |
bbc9e2f4 | 285 | node = __apicid_to_node[i]; |
6c62aa4a YL |
286 | if (node != NUMA_NO_NODE && node_online(node)) |
287 | return node; | |
288 | } | |
289 | for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) { | |
bbc9e2f4 | 290 | node = __apicid_to_node[i]; |
6c62aa4a YL |
291 | if (node != NUMA_NO_NODE && node_online(node)) |
292 | return node; | |
293 | } | |
294 | return first_node(node_online_map); /* Shouldn't happen */ | |
295 | } | |
296 | #endif | |
11fdd252 | 297 | |
4a376ec3 | 298 | /* |
23588c38 AH |
299 | * Fixup core topology information for |
300 | * (1) AMD multi-node processors | |
301 | * Assumption: Number of cores in each internal node is the same. | |
6057b4d3 | 302 | * (2) AMD processors supporting compute units |
4a376ec3 | 303 | */ |
c8e56d20 | 304 | #ifdef CONFIG_SMP |
148f9bb8 | 305 | static void amd_get_topology(struct cpuinfo_x86 *c) |
4a376ec3 | 306 | { |
23588c38 | 307 | u8 node_id; |
4a376ec3 AH |
308 | int cpu = smp_processor_id(); |
309 | ||
23588c38 | 310 | /* get information required for multi-node processors */ |
362f924b | 311 | if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { |
6057b4d3 | 312 | |
a33d3317 | 313 | node_id = cpuid_ecx(0x8000001e) & 7; |
b6a50cdd YG |
314 | |
315 | /* | |
316 | * We may have multiple LLCs if L3 caches exist, so check if we | |
317 | * have an L3 cache by looking at the L3 cache CPUID leaf. | |
318 | */ | |
319 | if (cpuid_edx(0x80000006)) { | |
320 | if (c->x86 == 0x17) { | |
321 | /* | |
322 | * LLC is at the core complex level. | |
323 | * Core complex id is ApicId[3]. | |
324 | */ | |
325 | per_cpu(cpu_llc_id, cpu) = c->apicid >> 3; | |
326 | } else { | |
327 | /* LLC is at the node level. */ | |
328 | per_cpu(cpu_llc_id, cpu) = node_id; | |
329 | } | |
330 | } | |
23588c38 | 331 | } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) { |
6057b4d3 AH |
332 | u64 value; |
333 | ||
23588c38 | 334 | rdmsrl(MSR_FAM10H_NODE_ID, value); |
23588c38 | 335 | node_id = value & 7; |
b6a50cdd YG |
336 | |
337 | per_cpu(cpu_llc_id, cpu) = node_id; | |
23588c38 | 338 | } else |
4a376ec3 AH |
339 | return; |
340 | ||
23588c38 | 341 | /* fixup multi-node processor information */ |
cc2749e4 | 342 | if (nodes_per_socket > 1) { |
d518573d | 343 | u32 cus_per_node; |
6057b4d3 | 344 | |
23588c38 | 345 | set_cpu_cap(c, X86_FEATURE_AMD_DCM); |
ee6825c8 | 346 | cus_per_node = c->x86_max_cores / nodes_per_socket; |
9d260ebc | 347 | |
9e81509e | 348 | /* core id has to be in the [0 .. cores_per_node - 1] range */ |
8196dab4 | 349 | c->cpu_core_id %= cus_per_node; |
23588c38 | 350 | } |
4a376ec3 AH |
351 | } |
352 | #endif | |
353 | ||
11fdd252 | 354 | /* |
aa5e5dc2 | 355 | * On a AMD dual core setup the lower bits of the APIC id distinguish the cores. |
11fdd252 YL |
356 | * Assumes number of cores is a power of two. |
357 | */ | |
148f9bb8 | 358 | static void amd_detect_cmp(struct cpuinfo_x86 *c) |
11fdd252 | 359 | { |
c8e56d20 | 360 | #ifdef CONFIG_SMP |
11fdd252 | 361 | unsigned bits; |
99bd0c0f | 362 | int cpu = smp_processor_id(); |
11fdd252 YL |
363 | |
364 | bits = c->x86_coreid_bits; | |
11fdd252 YL |
365 | /* Low order bits define the core id (index of core in socket) */ |
366 | c->cpu_core_id = c->initial_apicid & ((1 << bits)-1); | |
367 | /* Convert the initial APIC ID into the socket ID */ | |
368 | c->phys_proc_id = c->initial_apicid >> bits; | |
99bd0c0f AH |
369 | /* use socket ID also for last level cache */ |
370 | per_cpu(cpu_llc_id, cpu) = c->phys_proc_id; | |
23588c38 | 371 | amd_get_topology(c); |
11fdd252 YL |
372 | #endif |
373 | } | |
374 | ||
8b84c8df | 375 | u16 amd_get_nb_id(int cpu) |
6a812691 | 376 | { |
8b84c8df | 377 | u16 id = 0; |
6a812691 AH |
378 | #ifdef CONFIG_SMP |
379 | id = per_cpu(cpu_llc_id, cpu); | |
380 | #endif | |
381 | return id; | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(amd_get_nb_id); | |
384 | ||
cc2749e4 AG |
385 | u32 amd_get_nodes_per_socket(void) |
386 | { | |
387 | return nodes_per_socket; | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(amd_get_nodes_per_socket); | |
390 | ||
148f9bb8 | 391 | static void srat_detect_node(struct cpuinfo_x86 *c) |
6c62aa4a | 392 | { |
645a7919 | 393 | #ifdef CONFIG_NUMA |
6c62aa4a YL |
394 | int cpu = smp_processor_id(); |
395 | int node; | |
0d96b9ff | 396 | unsigned apicid = c->apicid; |
6c62aa4a | 397 | |
bbc9e2f4 TH |
398 | node = numa_cpu_node(cpu); |
399 | if (node == NUMA_NO_NODE) | |
400 | node = per_cpu(cpu_llc_id, cpu); | |
6c62aa4a | 401 | |
64be4c1c | 402 | /* |
68894632 AH |
403 | * On multi-fabric platform (e.g. Numascale NumaChip) a |
404 | * platform-specific handler needs to be called to fixup some | |
405 | * IDs of the CPU. | |
64be4c1c | 406 | */ |
68894632 | 407 | if (x86_cpuinit.fixup_cpu_id) |
64be4c1c DB |
408 | x86_cpuinit.fixup_cpu_id(c, node); |
409 | ||
6c62aa4a | 410 | if (!node_online(node)) { |
bbc9e2f4 TH |
411 | /* |
412 | * Two possibilities here: | |
413 | * | |
414 | * - The CPU is missing memory and no node was created. In | |
415 | * that case try picking one from a nearby CPU. | |
416 | * | |
417 | * - The APIC IDs differ from the HyperTransport node IDs | |
418 | * which the K8 northbridge parsing fills in. Assume | |
419 | * they are all increased by a constant offset, but in | |
420 | * the same order as the HT nodeids. If that doesn't | |
421 | * result in a usable node fall back to the path for the | |
422 | * previous case. | |
423 | * | |
424 | * This workaround operates directly on the mapping between | |
425 | * APIC ID and NUMA node, assuming certain relationship | |
426 | * between APIC ID, HT node ID and NUMA topology. As going | |
427 | * through CPU mapping may alter the outcome, directly | |
428 | * access __apicid_to_node[]. | |
429 | */ | |
6c62aa4a YL |
430 | int ht_nodeid = c->initial_apicid; |
431 | ||
7030a7e9 | 432 | if (__apicid_to_node[ht_nodeid] != NUMA_NO_NODE) |
bbc9e2f4 | 433 | node = __apicid_to_node[ht_nodeid]; |
6c62aa4a YL |
434 | /* Pick a nearby node */ |
435 | if (!node_online(node)) | |
436 | node = nearby_node(apicid); | |
437 | } | |
438 | numa_set_node(cpu, node); | |
6c62aa4a YL |
439 | #endif |
440 | } | |
441 | ||
148f9bb8 | 442 | static void early_init_amd_mc(struct cpuinfo_x86 *c) |
11fdd252 | 443 | { |
c8e56d20 | 444 | #ifdef CONFIG_SMP |
11fdd252 YL |
445 | unsigned bits, ecx; |
446 | ||
447 | /* Multi core CPU? */ | |
448 | if (c->extended_cpuid_level < 0x80000008) | |
449 | return; | |
450 | ||
451 | ecx = cpuid_ecx(0x80000008); | |
452 | ||
453 | c->x86_max_cores = (ecx & 0xff) + 1; | |
454 | ||
455 | /* CPU telling us the core id bits shift? */ | |
456 | bits = (ecx >> 12) & 0xF; | |
457 | ||
458 | /* Otherwise recompute */ | |
459 | if (bits == 0) { | |
460 | while ((1 << bits) < c->x86_max_cores) | |
461 | bits++; | |
462 | } | |
463 | ||
464 | c->x86_coreid_bits = bits; | |
465 | #endif | |
466 | } | |
467 | ||
148f9bb8 | 468 | static void bsp_init_amd(struct cpuinfo_x86 *c) |
8fa8b035 | 469 | { |
26bfa5f8 BP |
470 | |
471 | #ifdef CONFIG_X86_64 | |
472 | if (c->x86 >= 0xf) { | |
473 | unsigned long long tseg; | |
474 | ||
475 | /* | |
476 | * Split up direct mapping around the TSEG SMM area. | |
477 | * Don't do it for gbpages because there seems very little | |
478 | * benefit in doing so. | |
479 | */ | |
480 | if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, &tseg)) { | |
481 | unsigned long pfn = tseg >> PAGE_SHIFT; | |
482 | ||
1b74dde7 | 483 | pr_debug("tseg: %010llx\n", tseg); |
26bfa5f8 BP |
484 | if (pfn_range_is_mapped(pfn, pfn + 1)) |
485 | set_memory_4k((unsigned long)__va(tseg), 1); | |
486 | } | |
487 | } | |
488 | #endif | |
489 | ||
8fa8b035 BP |
490 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { |
491 | ||
492 | if (c->x86 > 0x10 || | |
493 | (c->x86 == 0x10 && c->x86_model >= 0x2)) { | |
494 | u64 val; | |
495 | ||
496 | rdmsrl(MSR_K7_HWCR, val); | |
497 | if (!(val & BIT(24))) | |
1b74dde7 | 498 | pr_warn(FW_BUG "TSC doesn't count with P0 frequency!\n"); |
8fa8b035 BP |
499 | } |
500 | } | |
501 | ||
502 | if (c->x86 == 0x15) { | |
503 | unsigned long upperbit; | |
504 | u32 cpuid, assoc; | |
505 | ||
506 | cpuid = cpuid_edx(0x80000005); | |
507 | assoc = cpuid >> 16 & 0xff; | |
508 | upperbit = ((cpuid >> 24) << 10) / assoc; | |
509 | ||
510 | va_align.mask = (upperbit - 1) & PAGE_MASK; | |
511 | va_align.flags = ALIGN_VA_32 | ALIGN_VA_64; | |
4e26d11f HMG |
512 | |
513 | /* A random value per boot for bit slice [12:upper_bit) */ | |
514 | va_align.bits = get_random_int() & va_align.mask; | |
8fa8b035 | 515 | } |
b466bdb6 HR |
516 | |
517 | if (cpu_has(c, X86_FEATURE_MWAITX)) | |
518 | use_mwaitx_delay(); | |
8dfeae0d HR |
519 | |
520 | if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { | |
521 | u32 ecx; | |
522 | ||
523 | ecx = cpuid_ecx(0x8000001e); | |
524 | nodes_per_socket = ((ecx >> 8) & 7) + 1; | |
525 | } else if (boot_cpu_has(X86_FEATURE_NODEID_MSR)) { | |
526 | u64 value; | |
527 | ||
528 | rdmsrl(MSR_FAM10H_NODE_ID, value); | |
529 | nodes_per_socket = ((value >> 3) & 7) + 1; | |
530 | } | |
8fa8b035 BP |
531 | } |
532 | ||
148f9bb8 | 533 | static void early_init_amd(struct cpuinfo_x86 *c) |
2b16a235 | 534 | { |
11fdd252 YL |
535 | early_init_amd_mc(c); |
536 | ||
40fb1715 VP |
537 | /* |
538 | * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate | |
539 | * with P/T states and does not stop in deep C-states | |
540 | */ | |
541 | if (c->x86_power & (1 << 8)) { | |
e3224234 | 542 | set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); |
40fb1715 | 543 | set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC); |
c98fdeaa | 544 | if (!check_tsc_unstable()) |
35af99e6 | 545 | set_sched_clock_stable(); |
40fb1715 | 546 | } |
5fef55fd | 547 | |
01fe03ff HR |
548 | /* Bit 12 of 8000_0007 edx is accumulated power mechanism. */ |
549 | if (c->x86_power & BIT(12)) | |
550 | set_cpu_cap(c, X86_FEATURE_ACC_POWER); | |
551 | ||
6c62aa4a YL |
552 | #ifdef CONFIG_X86_64 |
553 | set_cpu_cap(c, X86_FEATURE_SYSCALL32); | |
554 | #else | |
5fef55fd | 555 | /* Set MTRR capability flag if appropriate */ |
6c62aa4a YL |
556 | if (c->x86 == 5) |
557 | if (c->x86_model == 13 || c->x86_model == 9 || | |
558 | (c->x86_model == 8 && c->x86_mask >= 8)) | |
559 | set_cpu_cap(c, X86_FEATURE_K6_MTRR); | |
560 | #endif | |
42937e81 | 561 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI) |
b9d16a2a AG |
562 | /* |
563 | * ApicID can always be treated as an 8-bit value for AMD APIC versions | |
564 | * >= 0x10, but even old K8s came out of reset with version 0x10. So, we | |
565 | * can safely set X86_FEATURE_EXTD_APICID unconditionally for families | |
566 | * after 16h. | |
567 | */ | |
425d8c2f BP |
568 | if (boot_cpu_has(X86_FEATURE_APIC)) { |
569 | if (c->x86 > 0x16) | |
42937e81 | 570 | set_cpu_cap(c, X86_FEATURE_EXTD_APICID); |
425d8c2f BP |
571 | else if (c->x86 >= 0xf) { |
572 | /* check CPU config space for extended APIC ID */ | |
573 | unsigned int val; | |
574 | ||
575 | val = read_pci_config(0, 24, 0, 0x68); | |
576 | if ((val >> 17 & 0x3) == 0x3) | |
577 | set_cpu_cap(c, X86_FEATURE_EXTD_APICID); | |
578 | } | |
42937e81 AH |
579 | } |
580 | #endif | |
3b564968 | 581 | |
c1118b36 PB |
582 | /* |
583 | * This is only needed to tell the kernel whether to use VMCALL | |
584 | * and VMMCALL. VMMCALL is never executed except under virt, so | |
585 | * we can set it unconditionally. | |
586 | */ | |
587 | set_cpu_cap(c, X86_FEATURE_VMMCALL); | |
588 | ||
3b564968 | 589 | /* F16h erratum 793, CVE-2013-6885 */ |
8f86a737 BP |
590 | if (c->x86 == 0x16 && c->x86_model <= 0xf) |
591 | msr_set_bit(MSR_AMD64_LS_CFG, 15); | |
2b16a235 | 592 | |
3344ed30 TG |
593 | /* |
594 | * Check whether the machine is affected by erratum 400. This is | |
595 | * used to select the proper idle routine and to enable the check | |
596 | * whether the machine is affected in arch_post_acpi_init(), which | |
597 | * sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check. | |
598 | */ | |
599 | if (cpu_has_amd_erratum(c, amd_erratum_400)) | |
600 | set_cpu_bug(c, X86_BUG_AMD_E400); | |
601 | } | |
e6ee94d5 | 602 | |
26bfa5f8 BP |
603 | static void init_amd_k8(struct cpuinfo_x86 *c) |
604 | { | |
605 | u32 level; | |
606 | u64 value; | |
607 | ||
608 | /* On C+ stepping K8 rep microcode works well for copy/memset */ | |
609 | level = cpuid_eax(1); | |
610 | if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58) | |
611 | set_cpu_cap(c, X86_FEATURE_REP_GOOD); | |
612 | ||
613 | /* | |
614 | * Some BIOSes incorrectly force this feature, but only K8 revision D | |
615 | * (model = 0x14) and later actually support it. | |
616 | * (AMD Erratum #110, docId: 25759). | |
617 | */ | |
618 | if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM)) { | |
619 | clear_cpu_cap(c, X86_FEATURE_LAHF_LM); | |
620 | if (!rdmsrl_amd_safe(0xc001100d, &value)) { | |
621 | value &= ~BIT_64(32); | |
622 | wrmsrl_amd_safe(0xc001100d, value); | |
623 | } | |
624 | } | |
625 | ||
626 | if (!c->x86_model_id[0]) | |
627 | strcpy(c->x86_model_id, "Hammer"); | |
6f9b63a0 BP |
628 | |
629 | #ifdef CONFIG_SMP | |
630 | /* | |
631 | * Disable TLB flush filter by setting HWCR.FFDIS on K8 | |
632 | * bit 6 of msr C001_0015 | |
633 | * | |
634 | * Errata 63 for SH-B3 steppings | |
635 | * Errata 122 for all steppings (F+ have it disabled by default) | |
636 | */ | |
637 | msr_set_bit(MSR_K7_HWCR, 6); | |
638 | #endif | |
96e5d28a | 639 | set_cpu_bug(c, X86_BUG_SWAPGS_FENCE); |
26bfa5f8 BP |
640 | } |
641 | ||
642 | static void init_amd_gh(struct cpuinfo_x86 *c) | |
643 | { | |
644 | #ifdef CONFIG_X86_64 | |
645 | /* do this for boot cpu */ | |
646 | if (c == &boot_cpu_data) | |
647 | check_enable_amd_mmconf_dmi(); | |
648 | ||
649 | fam10h_check_enable_mmcfg(); | |
650 | #endif | |
651 | ||
652 | /* | |
653 | * Disable GART TLB Walk Errors on Fam10h. We do this here because this | |
654 | * is always needed when GART is enabled, even in a kernel which has no | |
655 | * MCE support built in. BIOS should disable GartTlbWlk Errors already. | |
656 | * If it doesn't, we do it here as suggested by the BKDG. | |
657 | * | |
658 | * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012 | |
659 | */ | |
660 | msr_set_bit(MSR_AMD64_MCx_MASK(4), 10); | |
661 | ||
662 | /* | |
663 | * On family 10h BIOS may not have properly enabled WC+ support, causing | |
664 | * it to be converted to CD memtype. This may result in performance | |
665 | * degradation for certain nested-paging guests. Prevent this conversion | |
666 | * by clearing bit 24 in MSR_AMD64_BU_CFG2. | |
667 | * | |
668 | * NOTE: we want to use the _safe accessors so as not to #GP kvm | |
669 | * guests on older kvm hosts. | |
670 | */ | |
671 | msr_clear_bit(MSR_AMD64_BU_CFG2, 24); | |
672 | ||
673 | if (cpu_has_amd_erratum(c, amd_erratum_383)) | |
674 | set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH); | |
675 | } | |
676 | ||
d1992996 EC |
677 | #define MSR_AMD64_DE_CFG 0xC0011029 |
678 | ||
679 | static void init_amd_ln(struct cpuinfo_x86 *c) | |
680 | { | |
681 | /* | |
682 | * Apply erratum 665 fix unconditionally so machines without a BIOS | |
683 | * fix work. | |
684 | */ | |
685 | msr_set_bit(MSR_AMD64_DE_CFG, 31); | |
686 | } | |
687 | ||
26bfa5f8 BP |
688 | static void init_amd_bd(struct cpuinfo_x86 *c) |
689 | { | |
690 | u64 value; | |
691 | ||
692 | /* re-enable TopologyExtensions if switched off by BIOS */ | |
96685a55 | 693 | if ((c->x86_model >= 0x10) && (c->x86_model <= 0x6f) && |
26bfa5f8 BP |
694 | !cpu_has(c, X86_FEATURE_TOPOEXT)) { |
695 | ||
696 | if (msr_set_bit(0xc0011005, 54) > 0) { | |
697 | rdmsrl(0xc0011005, value); | |
698 | if (value & BIT_64(54)) { | |
699 | set_cpu_cap(c, X86_FEATURE_TOPOEXT); | |
96685a55 | 700 | pr_info_once(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n"); |
26bfa5f8 BP |
701 | } |
702 | } | |
703 | } | |
704 | ||
705 | /* | |
706 | * The way access filter has a performance penalty on some workloads. | |
707 | * Disable it on the affected CPUs. | |
708 | */ | |
709 | if ((c->x86_model >= 0x02) && (c->x86_model < 0x20)) { | |
ae8b7875 | 710 | if (!rdmsrl_safe(MSR_F15H_IC_CFG, &value) && !(value & 0x1E)) { |
26bfa5f8 | 711 | value |= 0x1E; |
ae8b7875 | 712 | wrmsrl_safe(MSR_F15H_IC_CFG, value); |
26bfa5f8 BP |
713 | } |
714 | } | |
715 | } | |
716 | ||
148f9bb8 | 717 | static void init_amd(struct cpuinfo_x86 *c) |
1da177e4 | 718 | { |
8e8da023 | 719 | u32 dummy; |
7d318d77 | 720 | |
2b16a235 AK |
721 | early_init_amd(c); |
722 | ||
fb87a298 PC |
723 | /* |
724 | * Bit 31 in normal CPUID used for nonstandard 3DNow ID; | |
16282a8e | 725 | * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway |
fb87a298 | 726 | */ |
16282a8e | 727 | clear_cpu_cap(c, 0*32+31); |
fb87a298 | 728 | |
12d8a961 | 729 | if (c->x86 >= 0x10) |
6c62aa4a | 730 | set_cpu_cap(c, X86_FEATURE_REP_GOOD); |
0d96b9ff YL |
731 | |
732 | /* get apicid instead of initial apic id from cpuid */ | |
733 | c->apicid = hard_smp_processor_id(); | |
11fdd252 YL |
734 | |
735 | /* K6s reports MCEs but don't actually have all the MSRs */ | |
736 | if (c->x86 < 6) | |
737 | clear_cpu_cap(c, X86_FEATURE_MCE); | |
26bfa5f8 BP |
738 | |
739 | switch (c->x86) { | |
740 | case 4: init_amd_k5(c); break; | |
741 | case 5: init_amd_k6(c); break; | |
742 | case 6: init_amd_k7(c); break; | |
743 | case 0xf: init_amd_k8(c); break; | |
744 | case 0x10: init_amd_gh(c); break; | |
d1992996 | 745 | case 0x12: init_amd_ln(c); break; |
26bfa5f8 BP |
746 | case 0x15: init_amd_bd(c); break; |
747 | } | |
11fdd252 | 748 | |
6c62aa4a | 749 | /* Enable workaround for FXSAVE leak */ |
18bd057b | 750 | if (c->x86 >= 6) |
9b13a93d | 751 | set_cpu_bug(c, X86_BUG_FXSAVE_LEAK); |
1da177e4 | 752 | |
27c13ece | 753 | cpu_detect_cache_sizes(c); |
3dd9d514 | 754 | |
11fdd252 | 755 | /* Multi core CPU? */ |
6c62aa4a | 756 | if (c->extended_cpuid_level >= 0x80000008) { |
11fdd252 | 757 | amd_detect_cmp(c); |
6c62aa4a YL |
758 | srat_detect_node(c); |
759 | } | |
faee9a5d | 760 | |
6c62aa4a | 761 | #ifdef CONFIG_X86_32 |
11fdd252 | 762 | detect_ht(c); |
6c62aa4a | 763 | #endif |
39b3a791 | 764 | |
04a15418 | 765 | init_amd_cacheinfo(c); |
3556ddfa | 766 | |
12d8a961 | 767 | if (c->x86 >= 0xf) |
11fdd252 | 768 | set_cpu_cap(c, X86_FEATURE_K8); |
de421863 | 769 | |
054efb64 | 770 | if (cpu_has(c, X86_FEATURE_XMM2)) { |
11fdd252 | 771 | /* MFENCE stops RDTSC speculation */ |
16282a8e | 772 | set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC); |
11fdd252 | 773 | } |
6c62aa4a | 774 | |
e9cdd343 BO |
775 | /* |
776 | * Family 0x12 and above processors have APIC timer | |
777 | * running in deep C states. | |
778 | */ | |
779 | if (c->x86 > 0x11) | |
b87cf80a | 780 | set_cpu_cap(c, X86_FEATURE_ARAT); |
5bbc097d | 781 | |
8e8da023 | 782 | rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy); |
a930dc45 BP |
783 | |
784 | /* 3DNow or LM implies PREFETCHW */ | |
785 | if (!cpu_has(c, X86_FEATURE_3DNOWPREFETCH)) | |
786 | if (cpu_has(c, X86_FEATURE_3DNOW) || cpu_has(c, X86_FEATURE_LM)) | |
787 | set_cpu_cap(c, X86_FEATURE_3DNOWPREFETCH); | |
61f01dd9 AL |
788 | |
789 | /* AMD CPUs don't reset SS attributes on SYSRET */ | |
790 | set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); | |
1da177e4 LT |
791 | } |
792 | ||
6c62aa4a | 793 | #ifdef CONFIG_X86_32 |
148f9bb8 | 794 | static unsigned int amd_size_cache(struct cpuinfo_x86 *c, unsigned int size) |
1da177e4 LT |
795 | { |
796 | /* AMD errata T13 (order #21922) */ | |
797 | if ((c->x86 == 6)) { | |
8bdbd962 AC |
798 | /* Duron Rev A0 */ |
799 | if (c->x86_model == 3 && c->x86_mask == 0) | |
1da177e4 | 800 | size = 64; |
8bdbd962 | 801 | /* Tbird rev A1/A2 */ |
1da177e4 | 802 | if (c->x86_model == 4 && |
8bdbd962 | 803 | (c->x86_mask == 0 || c->x86_mask == 1)) |
1da177e4 LT |
804 | size = 256; |
805 | } | |
806 | return size; | |
807 | } | |
6c62aa4a | 808 | #endif |
1da177e4 | 809 | |
148f9bb8 | 810 | static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c) |
b46882e4 BP |
811 | { |
812 | u32 ebx, eax, ecx, edx; | |
813 | u16 mask = 0xfff; | |
814 | ||
815 | if (c->x86 < 0xf) | |
816 | return; | |
817 | ||
818 | if (c->extended_cpuid_level < 0x80000006) | |
819 | return; | |
820 | ||
821 | cpuid(0x80000006, &eax, &ebx, &ecx, &edx); | |
822 | ||
823 | tlb_lld_4k[ENTRIES] = (ebx >> 16) & mask; | |
824 | tlb_lli_4k[ENTRIES] = ebx & mask; | |
825 | ||
826 | /* | |
827 | * K8 doesn't have 2M/4M entries in the L2 TLB so read out the L1 TLB | |
828 | * characteristics from the CPUID function 0x80000005 instead. | |
829 | */ | |
830 | if (c->x86 == 0xf) { | |
831 | cpuid(0x80000005, &eax, &ebx, &ecx, &edx); | |
832 | mask = 0xff; | |
833 | } | |
834 | ||
835 | /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */ | |
d1393367 BP |
836 | if (!((eax >> 16) & mask)) |
837 | tlb_lld_2m[ENTRIES] = (cpuid_eax(0x80000005) >> 16) & 0xff; | |
838 | else | |
b46882e4 | 839 | tlb_lld_2m[ENTRIES] = (eax >> 16) & mask; |
b46882e4 BP |
840 | |
841 | /* a 4M entry uses two 2M entries */ | |
842 | tlb_lld_4m[ENTRIES] = tlb_lld_2m[ENTRIES] >> 1; | |
843 | ||
844 | /* Handle ITLB 2M and 4M sizes, fall back to L1 if L2 is disabled */ | |
845 | if (!(eax & mask)) { | |
846 | /* Erratum 658 */ | |
847 | if (c->x86 == 0x15 && c->x86_model <= 0x1f) { | |
848 | tlb_lli_2m[ENTRIES] = 1024; | |
849 | } else { | |
850 | cpuid(0x80000005, &eax, &ebx, &ecx, &edx); | |
851 | tlb_lli_2m[ENTRIES] = eax & 0xff; | |
852 | } | |
853 | } else | |
854 | tlb_lli_2m[ENTRIES] = eax & mask; | |
855 | ||
856 | tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1; | |
857 | } | |
858 | ||
148f9bb8 | 859 | static const struct cpu_dev amd_cpu_dev = { |
1da177e4 | 860 | .c_vendor = "AMD", |
fb87a298 | 861 | .c_ident = { "AuthenticAMD" }, |
6c62aa4a | 862 | #ifdef CONFIG_X86_32 |
09dc68d9 JB |
863 | .legacy_models = { |
864 | { .family = 4, .model_names = | |
1da177e4 LT |
865 | { |
866 | [3] = "486 DX/2", | |
867 | [7] = "486 DX/2-WB", | |
fb87a298 PC |
868 | [8] = "486 DX/4", |
869 | [9] = "486 DX/4-WB", | |
1da177e4 | 870 | [14] = "Am5x86-WT", |
fb87a298 | 871 | [15] = "Am5x86-WB" |
1da177e4 LT |
872 | } |
873 | }, | |
874 | }, | |
09dc68d9 | 875 | .legacy_cache_size = amd_size_cache, |
6c62aa4a | 876 | #endif |
03ae5768 | 877 | .c_early_init = early_init_amd, |
b46882e4 | 878 | .c_detect_tlb = cpu_detect_tlb_amd, |
8fa8b035 | 879 | .c_bsp_init = bsp_init_amd, |
1da177e4 | 880 | .c_init = init_amd, |
10a434fc | 881 | .c_x86_vendor = X86_VENDOR_AMD, |
1da177e4 LT |
882 | }; |
883 | ||
10a434fc | 884 | cpu_dev_register(amd_cpu_dev); |
d78d671d HR |
885 | |
886 | /* | |
887 | * AMD errata checking | |
888 | * | |
889 | * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or | |
890 | * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that | |
891 | * have an OSVW id assigned, which it takes as first argument. Both take a | |
892 | * variable number of family-specific model-stepping ranges created by | |
7d7dc116 | 893 | * AMD_MODEL_RANGE(). |
d78d671d HR |
894 | * |
895 | * Example: | |
896 | * | |
897 | * const int amd_erratum_319[] = | |
898 | * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2), | |
899 | * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0), | |
900 | * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0)); | |
901 | */ | |
902 | ||
7d7dc116 BP |
903 | #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 } |
904 | #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 } | |
905 | #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \ | |
906 | ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end)) | |
907 | #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff) | |
908 | #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff) | |
909 | #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff) | |
910 | ||
911 | static const int amd_erratum_400[] = | |
328935e6 | 912 | AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf), |
9d8888c2 HR |
913 | AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf)); |
914 | ||
e6ee94d5 | 915 | static const int amd_erratum_383[] = |
1be85a6d | 916 | AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf)); |
9d8888c2 | 917 | |
8c6b79bb TK |
918 | |
919 | static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum) | |
d78d671d | 920 | { |
d78d671d HR |
921 | int osvw_id = *erratum++; |
922 | u32 range; | |
923 | u32 ms; | |
924 | ||
d78d671d HR |
925 | if (osvw_id >= 0 && osvw_id < 65536 && |
926 | cpu_has(cpu, X86_FEATURE_OSVW)) { | |
927 | u64 osvw_len; | |
928 | ||
929 | rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len); | |
930 | if (osvw_id < osvw_len) { | |
931 | u64 osvw_bits; | |
932 | ||
933 | rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6), | |
934 | osvw_bits); | |
935 | return osvw_bits & (1ULL << (osvw_id & 0x3f)); | |
936 | } | |
937 | } | |
938 | ||
939 | /* OSVW unavailable or ID unknown, match family-model-stepping range */ | |
07a7795c | 940 | ms = (cpu->x86_model << 4) | cpu->x86_mask; |
d78d671d HR |
941 | while ((range = *erratum++)) |
942 | if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) && | |
943 | (ms >= AMD_MODEL_RANGE_START(range)) && | |
944 | (ms <= AMD_MODEL_RANGE_END(range))) | |
945 | return true; | |
946 | ||
947 | return false; | |
948 | } | |
d6d55f0b JS |
949 | |
950 | void set_dr_addr_mask(unsigned long mask, int dr) | |
951 | { | |
362f924b | 952 | if (!boot_cpu_has(X86_FEATURE_BPEXT)) |
d6d55f0b JS |
953 | return; |
954 | ||
955 | switch (dr) { | |
956 | case 0: | |
957 | wrmsr(MSR_F16H_DR0_ADDR_MASK, mask, 0); | |
958 | break; | |
959 | case 1: | |
960 | case 2: | |
961 | case 3: | |
962 | wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0); | |
963 | break; | |
964 | default: | |
965 | break; | |
966 | } | |
967 | } |