1 #include <linux/export.h>
2 #include <linux/bitops.h>
7 #include <linux/sched.h>
8 #include <asm/processor.h>
11 #include <asm/pci-direct.h>
14 # include <asm/mmconfig.h>
15 # include <asm/cacheflush.h>
20 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
25 WARN_ONCE((boot_cpu_data.x86 != 0xf),
26 "%s should only be used on K8!\n", __func__);
31 err = rdmsr_safe_regs(gprs);
33 *p = gprs[0] | ((u64)gprs[2] << 32);
38 static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)
42 WARN_ONCE((boot_cpu_data.x86 != 0xf),
43 "%s should only be used on K8!\n", __func__);
50 return wrmsr_safe_regs(gprs);
55 * B step AMD K6 before B 9730xxxx have hardware bugs that can cause
56 * misexecution of code under Linux. Owners of such processors should
57 * contact AMD for precise details and a CPU swap.
59 * See http://www.multimania.com/poulot/k6bug.html
60 * and section 2.6.2 of "AMD-K6 Processor Revision Guide - Model 6"
61 * (Publication # 21266 Issue Date: August 1998)
63 * The following test is erm.. interesting. AMD neglected to up
64 * the chip setting when fixing the bug but they also tweaked some
65 * performance at the same time..
68 extern __visible void vide(void);
69 __asm__(".globl vide\n\t.align 4\nvide: ret");
71 static void init_amd_k5(struct cpuinfo_x86 *c)
74 * General Systems BIOSen alias the cpu frequency registers
75 * of the Elan at 0x000df000. Unfortuantly, one of the Linux
76 * drivers subsequently pokes it, and changes the CPU speed.
77 * Workaround : Remove the unneeded alias.
79 #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */
80 #define CBAR_ENB (0x80000000)
81 #define CBAR_KEY (0X000000CB)
82 if (c->x86_model == 9 || c->x86_model == 10) {
83 if (inl(CBAR) & CBAR_ENB)
84 outl(0 | CBAR_KEY, CBAR);
89 static void init_amd_k6(struct cpuinfo_x86 *c)
92 int mbytes = get_num_physpages() >> (20-PAGE_SHIFT);
94 if (c->x86_model < 6) {
95 /* Based on AMD doc 20734R - June 2000 */
96 if (c->x86_model == 0) {
97 clear_cpu_cap(c, X86_FEATURE_APIC);
98 set_cpu_cap(c, X86_FEATURE_PGE);
103 if (c->x86_model == 6 && c->x86_mask == 1) {
104 const int K6_BUG_LOOP = 1000000;
106 void (*f_vide)(void);
109 printk(KERN_INFO "AMD K6 stepping B detected - ");
112 * It looks like AMD fixed the 2.6.2 bug and improved indirect
113 * calls at the same time.
124 if (d > 20*K6_BUG_LOOP)
126 "system stability may be impaired when more than 32 MB are used.\n");
128 printk(KERN_CONT "probably OK (after B9730xxxx).\n");
131 /* K6 with old style WHCR */
132 if (c->x86_model < 8 ||
133 (c->x86_model == 8 && c->x86_mask < 8)) {
134 /* We can only write allocate on the low 508Mb */
138 rdmsr(MSR_K6_WHCR, l, h);
139 if ((l&0x0000FFFF) == 0) {
141 l = (1<<0)|((mbytes/4)<<1);
142 local_irq_save(flags);
144 wrmsr(MSR_K6_WHCR, l, h);
145 local_irq_restore(flags);
146 printk(KERN_INFO "Enabling old style K6 write allocation for %d Mb\n",
152 if ((c->x86_model == 8 && c->x86_mask > 7) ||
153 c->x86_model == 9 || c->x86_model == 13) {
154 /* The more serious chips .. */
159 rdmsr(MSR_K6_WHCR, l, h);
160 if ((l&0xFFFF0000) == 0) {
162 l = ((mbytes>>2)<<22)|(1<<16);
163 local_irq_save(flags);
165 wrmsr(MSR_K6_WHCR, l, h);
166 local_irq_restore(flags);
167 printk(KERN_INFO "Enabling new style K6 write allocation for %d Mb\n",
174 if (c->x86_model == 10) {
175 /* AMD Geode LX is model 10 */
176 /* placeholder for any needed mods */
181 static void amd_k7_smp_check(struct cpuinfo_x86 *c)
183 /* calling is from identify_secondary_cpu() ? */
188 * Certain Athlons might work (for various values of 'work') in SMP
189 * but they are not certified as MP capable.
191 /* Athlon 660/661 is valid. */
192 if ((c->x86_model == 6) && ((c->x86_mask == 0) ||
196 /* Duron 670 is valid */
197 if ((c->x86_model == 7) && (c->x86_mask == 0))
201 * Athlon 662, Duron 671, and Athlon >model 7 have capability
202 * bit. It's worth noting that the A5 stepping (662) of some
203 * Athlon XP's have the MP bit set.
204 * See http://www.heise.de/newsticker/data/jow-18.10.01-000 for
207 if (((c->x86_model == 6) && (c->x86_mask >= 2)) ||
208 ((c->x86_model == 7) && (c->x86_mask >= 1)) ||
213 /* If we get here, not a certified SMP capable AMD system. */
216 * Don't taint if we are running SMP kernel on a single non-MP
219 WARN_ONCE(1, "WARNING: This combination of AMD"
220 " processors is not suitable for SMP.\n");
221 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
224 static void init_amd_k7(struct cpuinfo_x86 *c)
229 * Bit 15 of Athlon specific MSR 15, needs to be 0
230 * to enable SSE on Palomino/Morgan/Barton CPU's.
231 * If the BIOS didn't enable it already, enable it here.
233 if (c->x86_model >= 6 && c->x86_model <= 10) {
234 if (!cpu_has(c, X86_FEATURE_XMM)) {
235 printk(KERN_INFO "Enabling disabled K7/SSE Support.\n");
236 msr_clear_bit(MSR_K7_HWCR, 15);
237 set_cpu_cap(c, X86_FEATURE_XMM);
242 * It's been determined by AMD that Athlons since model 8 stepping 1
243 * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx
244 * As per AMD technical note 27212 0.2
246 if ((c->x86_model == 8 && c->x86_mask >= 1) || (c->x86_model > 8)) {
247 rdmsr(MSR_K7_CLK_CTL, l, h);
248 if ((l & 0xfff00000) != 0x20000000) {
250 "CPU: CLK_CTL MSR was %x. Reprogramming to %x\n",
251 l, ((l & 0x000fffff)|0x20000000));
252 wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h);
256 set_cpu_cap(c, X86_FEATURE_K7);
264 * To workaround broken NUMA config. Read the comment in
265 * srat_detect_node().
267 static int nearby_node(int apicid)
271 for (i = apicid - 1; i >= 0; i--) {
272 node = __apicid_to_node[i];
273 if (node != NUMA_NO_NODE && node_online(node))
276 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
277 node = __apicid_to_node[i];
278 if (node != NUMA_NO_NODE && node_online(node))
281 return first_node(node_online_map); /* Shouldn't happen */
286 * Fixup core topology information for
287 * (1) AMD multi-node processors
288 * Assumption: Number of cores in each internal node is the same.
289 * (2) AMD processors supporting compute units
292 static void amd_get_topology(struct cpuinfo_x86 *c)
294 u32 nodes, cores_per_cu = 1;
296 int cpu = smp_processor_id();
298 /* get information required for multi-node processors */
299 if (cpu_has_topoext) {
300 u32 eax, ebx, ecx, edx;
302 cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
303 nodes = ((ecx >> 8) & 7) + 1;
306 /* get compute unit information */
307 smp_num_siblings = ((ebx >> 8) & 3) + 1;
308 c->compute_unit_id = ebx & 0xff;
309 cores_per_cu += ((ebx >> 8) & 3);
310 } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {
313 rdmsrl(MSR_FAM10H_NODE_ID, value);
314 nodes = ((value >> 3) & 7) + 1;
319 /* fixup multi-node processor information */
324 set_cpu_cap(c, X86_FEATURE_AMD_DCM);
325 cores_per_node = c->x86_max_cores / nodes;
326 cus_per_node = cores_per_node / cores_per_cu;
328 /* store NodeID, use llc_shared_map to store sibling info */
329 per_cpu(cpu_llc_id, cpu) = node_id;
331 /* core id has to be in the [0 .. cores_per_node - 1] range */
332 c->cpu_core_id %= cores_per_node;
333 c->compute_unit_id %= cus_per_node;
339 * On a AMD dual core setup the lower bits of the APIC id distinguish the cores.
340 * Assumes number of cores is a power of two.
342 static void amd_detect_cmp(struct cpuinfo_x86 *c)
346 int cpu = smp_processor_id();
348 bits = c->x86_coreid_bits;
349 /* Low order bits define the core id (index of core in socket) */
350 c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
351 /* Convert the initial APIC ID into the socket ID */
352 c->phys_proc_id = c->initial_apicid >> bits;
353 /* use socket ID also for last level cache */
354 per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
359 u16 amd_get_nb_id(int cpu)
363 id = per_cpu(cpu_llc_id, cpu);
367 EXPORT_SYMBOL_GPL(amd_get_nb_id);
369 static void srat_detect_node(struct cpuinfo_x86 *c)
372 int cpu = smp_processor_id();
374 unsigned apicid = c->apicid;
376 node = numa_cpu_node(cpu);
377 if (node == NUMA_NO_NODE)
378 node = per_cpu(cpu_llc_id, cpu);
381 * On multi-fabric platform (e.g. Numascale NumaChip) a
382 * platform-specific handler needs to be called to fixup some
385 if (x86_cpuinit.fixup_cpu_id)
386 x86_cpuinit.fixup_cpu_id(c, node);
388 if (!node_online(node)) {
390 * Two possibilities here:
392 * - The CPU is missing memory and no node was created. In
393 * that case try picking one from a nearby CPU.
395 * - The APIC IDs differ from the HyperTransport node IDs
396 * which the K8 northbridge parsing fills in. Assume
397 * they are all increased by a constant offset, but in
398 * the same order as the HT nodeids. If that doesn't
399 * result in a usable node fall back to the path for the
402 * This workaround operates directly on the mapping between
403 * APIC ID and NUMA node, assuming certain relationship
404 * between APIC ID, HT node ID and NUMA topology. As going
405 * through CPU mapping may alter the outcome, directly
406 * access __apicid_to_node[].
408 int ht_nodeid = c->initial_apicid;
410 if (ht_nodeid >= 0 &&
411 __apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
412 node = __apicid_to_node[ht_nodeid];
413 /* Pick a nearby node */
414 if (!node_online(node))
415 node = nearby_node(apicid);
417 numa_set_node(cpu, node);
421 static void early_init_amd_mc(struct cpuinfo_x86 *c)
426 /* Multi core CPU? */
427 if (c->extended_cpuid_level < 0x80000008)
430 ecx = cpuid_ecx(0x80000008);
432 c->x86_max_cores = (ecx & 0xff) + 1;
434 /* CPU telling us the core id bits shift? */
435 bits = (ecx >> 12) & 0xF;
437 /* Otherwise recompute */
439 while ((1 << bits) < c->x86_max_cores)
443 c->x86_coreid_bits = bits;
447 static void bsp_init_amd(struct cpuinfo_x86 *c)
449 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
452 (c->x86 == 0x10 && c->x86_model >= 0x2)) {
455 rdmsrl(MSR_K7_HWCR, val);
456 if (!(val & BIT(24)))
457 printk(KERN_WARNING FW_BUG "TSC doesn't count "
458 "with P0 frequency!\n");
462 if (c->x86 == 0x15) {
463 unsigned long upperbit;
466 cpuid = cpuid_edx(0x80000005);
467 assoc = cpuid >> 16 & 0xff;
468 upperbit = ((cpuid >> 24) << 10) / assoc;
470 va_align.mask = (upperbit - 1) & PAGE_MASK;
471 va_align.flags = ALIGN_VA_32 | ALIGN_VA_64;
475 static void early_init_amd(struct cpuinfo_x86 *c)
477 early_init_amd_mc(c);
480 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
481 * with P/T states and does not stop in deep C-states
483 if (c->x86_power & (1 << 8)) {
484 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
485 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
486 if (!check_tsc_unstable())
487 set_sched_clock_stable();
491 set_cpu_cap(c, X86_FEATURE_SYSCALL32);
493 /* Set MTRR capability flag if appropriate */
495 if (c->x86_model == 13 || c->x86_model == 9 ||
496 (c->x86_model == 8 && c->x86_mask >= 8))
497 set_cpu_cap(c, X86_FEATURE_K6_MTRR);
499 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI)
500 /* check CPU config space for extended APIC ID */
501 if (cpu_has_apic && c->x86 >= 0xf) {
503 val = read_pci_config(0, 24, 0, 0x68);
504 if ((val & ((1 << 17) | (1 << 18))) == ((1 << 17) | (1 << 18)))
505 set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
509 /* F16h erratum 793, CVE-2013-6885 */
510 if (c->x86 == 0x16 && c->x86_model <= 0xf)
511 msr_set_bit(MSR_AMD64_LS_CFG, 15);
514 static const int amd_erratum_383[];
515 static const int amd_erratum_400[];
516 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
518 static void init_amd(struct cpuinfo_x86 *c)
521 unsigned long long value;
525 * Disable TLB flush filter by setting HWCR.FFDIS on K8
526 * bit 6 of msr C001_0015
528 * Errata 63 for SH-B3 steppings
529 * Errata 122 for all steppings (F+ have it disabled by default)
532 msr_set_bit(MSR_K7_HWCR, 6);
538 * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
539 * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
541 clear_cpu_cap(c, 0*32+31);
544 /* On C+ stepping K8 rep microcode works well for copy/memset */
548 level = cpuid_eax(1);
549 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
550 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
553 * Some BIOSes incorrectly force this feature, but only K8
554 * revision D (model = 0x14) and later actually support it.
555 * (AMD Erratum #110, docId: 25759).
557 if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM)) {
558 clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
559 if (!rdmsrl_amd_safe(0xc001100d, &value)) {
560 value &= ~(1ULL << 32);
561 wrmsrl_amd_safe(0xc001100d, value);
567 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
569 /* get apicid instead of initial apic id from cpuid */
570 c->apicid = hard_smp_processor_id();
574 * FIXME: We should handle the K5 here. Set up the write
575 * range and also turn on MSR 83 bits 4 and 31 (write alloc,
586 case 6: /* An Athlon/Duron */
591 /* K6s reports MCEs but don't actually have all the MSRs */
593 clear_cpu_cap(c, X86_FEATURE_MCE);
596 /* Enable workaround for FXSAVE leak */
598 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
600 if (!c->x86_model_id[0]) {
603 /* Should distinguish Models here, but this is only
604 a fallback anyways. */
605 strcpy(c->x86_model_id, "Hammer");
610 /* re-enable TopologyExtensions if switched off by BIOS */
611 if ((c->x86 == 0x15) &&
612 (c->x86_model >= 0x10) && (c->x86_model <= 0x1f) &&
613 !cpu_has(c, X86_FEATURE_TOPOEXT)) {
615 if (msr_set_bit(0xc0011005, 54) > 0) {
616 rdmsrl(0xc0011005, value);
617 if (value & BIT_64(54)) {
618 set_cpu_cap(c, X86_FEATURE_TOPOEXT);
619 pr_info(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
625 * The way access filter has a performance penalty on some workloads.
626 * Disable it on the affected CPUs.
628 if ((c->x86 == 0x15) &&
629 (c->x86_model >= 0x02) && (c->x86_model < 0x20)) {
631 if (!rdmsrl_safe(0xc0011021, &value) && !(value & 0x1E)) {
633 wrmsrl_safe(0xc0011021, value);
637 cpu_detect_cache_sizes(c);
639 /* Multi core CPU? */
640 if (c->extended_cpuid_level >= 0x80000008) {
649 init_amd_cacheinfo(c);
652 set_cpu_cap(c, X86_FEATURE_K8);
655 /* MFENCE stops RDTSC speculation */
656 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
660 if (c->x86 == 0x10) {
661 /* do this for boot cpu */
662 if (c == &boot_cpu_data)
663 check_enable_amd_mmconf_dmi();
665 fam10h_check_enable_mmcfg();
668 if (c == &boot_cpu_data && c->x86 >= 0xf) {
669 unsigned long long tseg;
672 * Split up direct mapping around the TSEG SMM area.
673 * Don't do it for gbpages because there seems very little
674 * benefit in doing so.
676 if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, &tseg)) {
677 unsigned long pfn = tseg >> PAGE_SHIFT;
679 printk(KERN_DEBUG "tseg: %010llx\n", tseg);
680 if (pfn_range_is_mapped(pfn, pfn + 1))
681 set_memory_4k((unsigned long)__va(tseg), 1);
687 * Family 0x12 and above processors have APIC timer
688 * running in deep C states.
691 set_cpu_cap(c, X86_FEATURE_ARAT);
693 if (c->x86 == 0x10) {
695 * Disable GART TLB Walk Errors on Fam10h. We do this here
696 * because this is always needed when GART is enabled, even in a
697 * kernel which has no MCE support built in.
698 * BIOS should disable GartTlbWlk Errors already. If
699 * it doesn't, do it here as suggested by the BKDG.
701 * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
703 msr_set_bit(MSR_AMD64_MCx_MASK(4), 10);
706 * On family 10h BIOS may not have properly enabled WC+ support,
707 * causing it to be converted to CD memtype. This may result in
708 * performance degradation for certain nested-paging guests.
709 * Prevent this conversion by clearing bit 24 in
712 * NOTE: we want to use the _safe accessors so as not to #GP kvm
713 * guests on older kvm hosts.
715 msr_clear_bit(MSR_AMD64_BU_CFG2, 24);
717 if (cpu_has_amd_erratum(c, amd_erratum_383))
718 set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
721 if (cpu_has_amd_erratum(c, amd_erratum_400))
722 set_cpu_bug(c, X86_BUG_AMD_APIC_C1E);
724 rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
728 static unsigned int amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
730 /* AMD errata T13 (order #21922) */
733 if (c->x86_model == 3 && c->x86_mask == 0)
735 /* Tbird rev A1/A2 */
736 if (c->x86_model == 4 &&
737 (c->x86_mask == 0 || c->x86_mask == 1))
744 static void cpu_set_tlb_flushall_shift(struct cpuinfo_x86 *c)
746 tlb_flushall_shift = 6;
749 static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c)
751 u32 ebx, eax, ecx, edx;
757 if (c->extended_cpuid_level < 0x80000006)
760 cpuid(0x80000006, &eax, &ebx, &ecx, &edx);
762 tlb_lld_4k[ENTRIES] = (ebx >> 16) & mask;
763 tlb_lli_4k[ENTRIES] = ebx & mask;
766 * K8 doesn't have 2M/4M entries in the L2 TLB so read out the L1 TLB
767 * characteristics from the CPUID function 0x80000005 instead.
770 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
774 /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
775 if (!((eax >> 16) & mask))
776 tlb_lld_2m[ENTRIES] = (cpuid_eax(0x80000005) >> 16) & 0xff;
778 tlb_lld_2m[ENTRIES] = (eax >> 16) & mask;
780 /* a 4M entry uses two 2M entries */
781 tlb_lld_4m[ENTRIES] = tlb_lld_2m[ENTRIES] >> 1;
783 /* Handle ITLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
786 if (c->x86 == 0x15 && c->x86_model <= 0x1f) {
787 tlb_lli_2m[ENTRIES] = 1024;
789 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
790 tlb_lli_2m[ENTRIES] = eax & 0xff;
793 tlb_lli_2m[ENTRIES] = eax & mask;
795 tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1;
797 cpu_set_tlb_flushall_shift(c);
800 static const struct cpu_dev amd_cpu_dev = {
802 .c_ident = { "AuthenticAMD" },
805 { .family = 4, .model_names =
816 .legacy_cache_size = amd_size_cache,
818 .c_early_init = early_init_amd,
819 .c_detect_tlb = cpu_detect_tlb_amd,
820 .c_bsp_init = bsp_init_amd,
822 .c_x86_vendor = X86_VENDOR_AMD,
825 cpu_dev_register(amd_cpu_dev);
828 * AMD errata checking
830 * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
831 * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
832 * have an OSVW id assigned, which it takes as first argument. Both take a
833 * variable number of family-specific model-stepping ranges created by
838 * const int amd_erratum_319[] =
839 * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
840 * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
841 * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
844 #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
845 #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 }
846 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
847 ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
848 #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
849 #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
850 #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
852 static const int amd_erratum_400[] =
853 AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
854 AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
856 static const int amd_erratum_383[] =
857 AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
860 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
862 int osvw_id = *erratum++;
866 if (osvw_id >= 0 && osvw_id < 65536 &&
867 cpu_has(cpu, X86_FEATURE_OSVW)) {
870 rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
871 if (osvw_id < osvw_len) {
874 rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
876 return osvw_bits & (1ULL << (osvw_id & 0x3f));
880 /* OSVW unavailable or ID unknown, match family-model-stepping range */
881 ms = (cpu->x86_model << 4) | cpu->x86_mask;
882 while ((range = *erratum++))
883 if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
884 (ms >= AMD_MODEL_RANGE_START(range)) &&
885 (ms <= AMD_MODEL_RANGE_END(range)))