1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/bitops.h>
7 #include <linux/sched.h>
8 #include <linux/sched/clock.h>
9 #include <linux/thread_info.h>
10 #include <linux/init.h>
11 #include <linux/uaccess.h>
13 #include <asm/cpufeature.h>
14 #include <asm/pgtable.h>
18 #include <asm/intel-family.h>
19 #include <asm/microcode_intel.h>
20 #include <asm/hwcap2.h>
24 #include <linux/topology.h>
29 #ifdef CONFIG_X86_LOCAL_APIC
30 #include <asm/mpspec.h>
35 * Processors which have self-snooping capability can handle conflicting
36 * memory type across CPUs by snooping its own cache. However, there exists
37 * CPU models in which having conflicting memory types still leads to
38 * unpredictable behavior, machine check errors, or hangs. Clear this
39 * feature to prevent its use on machines with known erratas.
41 static void check_memory_type_self_snoop_errata(struct cpuinfo_x86 *c)
43 switch (c->x86_model) {
44 case INTEL_FAM6_CORE_YONAH:
45 case INTEL_FAM6_CORE2_MEROM:
46 case INTEL_FAM6_CORE2_MEROM_L:
47 case INTEL_FAM6_CORE2_PENRYN:
48 case INTEL_FAM6_CORE2_DUNNINGTON:
49 case INTEL_FAM6_NEHALEM:
50 case INTEL_FAM6_NEHALEM_G:
51 case INTEL_FAM6_NEHALEM_EP:
52 case INTEL_FAM6_NEHALEM_EX:
53 case INTEL_FAM6_WESTMERE:
54 case INTEL_FAM6_WESTMERE_EP:
55 case INTEL_FAM6_SANDYBRIDGE:
56 setup_clear_cpu_cap(X86_FEATURE_SELFSNOOP);
60 static bool ring3mwait_disabled __read_mostly;
62 static int __init ring3mwait_disable(char *__unused)
64 ring3mwait_disabled = true;
67 __setup("ring3mwait=disable", ring3mwait_disable);
69 static void probe_xeon_phi_r3mwait(struct cpuinfo_x86 *c)
72 * Ring 3 MONITOR/MWAIT feature cannot be detected without
73 * cpu model and family comparison.
77 switch (c->x86_model) {
78 case INTEL_FAM6_XEON_PHI_KNL:
79 case INTEL_FAM6_XEON_PHI_KNM:
85 if (ring3mwait_disabled)
88 set_cpu_cap(c, X86_FEATURE_RING3MWAIT);
89 this_cpu_or(msr_misc_features_shadow,
90 1UL << MSR_MISC_FEATURES_ENABLES_RING3MWAIT_BIT);
92 if (c == &boot_cpu_data)
93 ELF_HWCAP2 |= HWCAP2_RING3MWAIT;
97 * Early microcode releases for the Spectre v2 mitigation were broken.
98 * Information taken from;
99 * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/03/microcode-update-guidance.pdf
100 * - https://kb.vmware.com/s/article/52345
101 * - Microcode revisions observed in the wild
102 * - Release note from 20180108 microcode release
104 struct sku_microcode {
109 static const struct sku_microcode spectre_bad_microcodes[] = {
110 { INTEL_FAM6_KABYLAKE, 0x0B, 0x80 },
111 { INTEL_FAM6_KABYLAKE, 0x0A, 0x80 },
112 { INTEL_FAM6_KABYLAKE, 0x09, 0x80 },
113 { INTEL_FAM6_KABYLAKE_L, 0x0A, 0x80 },
114 { INTEL_FAM6_KABYLAKE_L, 0x09, 0x80 },
115 { INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e },
116 { INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003c },
117 { INTEL_FAM6_BROADWELL, 0x04, 0x28 },
118 { INTEL_FAM6_BROADWELL_G, 0x01, 0x1b },
119 { INTEL_FAM6_BROADWELL_D, 0x02, 0x14 },
120 { INTEL_FAM6_BROADWELL_D, 0x03, 0x07000011 },
121 { INTEL_FAM6_BROADWELL_X, 0x01, 0x0b000025 },
122 { INTEL_FAM6_HASWELL_L, 0x01, 0x21 },
123 { INTEL_FAM6_HASWELL_G, 0x01, 0x18 },
124 { INTEL_FAM6_HASWELL, 0x03, 0x23 },
125 { INTEL_FAM6_HASWELL_X, 0x02, 0x3b },
126 { INTEL_FAM6_HASWELL_X, 0x04, 0x10 },
127 { INTEL_FAM6_IVYBRIDGE_X, 0x04, 0x42a },
128 /* Observed in the wild */
129 { INTEL_FAM6_SANDYBRIDGE_X, 0x06, 0x61b },
130 { INTEL_FAM6_SANDYBRIDGE_X, 0x07, 0x712 },
133 static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
138 * We know that the hypervisor lie to us on the microcode version so
139 * we may as well hope that it is running the correct version.
141 if (cpu_has(c, X86_FEATURE_HYPERVISOR))
147 for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
148 if (c->x86_model == spectre_bad_microcodes[i].model &&
149 c->x86_stepping == spectre_bad_microcodes[i].stepping)
150 return (c->microcode <= spectre_bad_microcodes[i].microcode);
155 static void early_init_intel(struct cpuinfo_x86 *c)
159 /* Unmask CPUID levels if masked: */
160 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
161 if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
162 MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) {
163 c->cpuid_level = cpuid_eax(0);
168 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
169 (c->x86 == 0x6 && c->x86_model >= 0x0e))
170 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
172 if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64))
173 c->microcode = intel_get_microcode_revision();
175 /* Now if any of them are set, check the blacklist and clear the lot */
176 if ((cpu_has(c, X86_FEATURE_SPEC_CTRL) ||
177 cpu_has(c, X86_FEATURE_INTEL_STIBP) ||
178 cpu_has(c, X86_FEATURE_IBRS) || cpu_has(c, X86_FEATURE_IBPB) ||
179 cpu_has(c, X86_FEATURE_STIBP)) && bad_spectre_microcode(c)) {
180 pr_warn("Intel Spectre v2 broken microcode detected; disabling Speculation Control\n");
181 setup_clear_cpu_cap(X86_FEATURE_IBRS);
182 setup_clear_cpu_cap(X86_FEATURE_IBPB);
183 setup_clear_cpu_cap(X86_FEATURE_STIBP);
184 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL);
185 setup_clear_cpu_cap(X86_FEATURE_MSR_SPEC_CTRL);
186 setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP);
187 setup_clear_cpu_cap(X86_FEATURE_SSBD);
188 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL_SSBD);
192 * Atom erratum AAE44/AAF40/AAG38/AAH41:
194 * A race condition between speculative fetches and invalidating
195 * a large page. This is worked around in microcode, but we
196 * need the microcode to have already been loaded... so if it is
197 * not, recommend a BIOS update and disable large pages.
199 if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_stepping <= 2 &&
200 c->microcode < 0x20e) {
201 pr_warn("Atom PSE erratum detected, BIOS microcode update recommended\n");
202 clear_cpu_cap(c, X86_FEATURE_PSE);
206 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
208 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
209 if (c->x86 == 15 && c->x86_cache_alignment == 64)
210 c->x86_cache_alignment = 128;
213 /* CPUID workaround for 0F33/0F34 CPU */
214 if (c->x86 == 0xF && c->x86_model == 0x3
215 && (c->x86_stepping == 0x3 || c->x86_stepping == 0x4))
216 c->x86_phys_bits = 36;
219 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
220 * with P/T states and does not stop in deep C-states.
222 * It is also reliable across cores and sockets. (but not across
223 * cabinets - we turn it off in that case explicitly.)
225 if (c->x86_power & (1 << 8)) {
226 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
227 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
230 /* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
232 switch (c->x86_model) {
233 case INTEL_FAM6_ATOM_SALTWELL_MID:
234 case INTEL_FAM6_ATOM_SALTWELL_TABLET:
235 case INTEL_FAM6_ATOM_SILVERMONT_MID:
236 case INTEL_FAM6_ATOM_AIRMONT_NP:
237 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
245 * There is a known erratum on Pentium III and Core Solo
247 * " Page with PAT set to WC while associated MTRR is UC
248 * may consolidate to UC "
249 * Because of this erratum, it is better to stick with
250 * setting WC in MTRR rather than using PAT on these CPUs.
252 * Enable PAT WC only on P4, Core 2 or later CPUs.
254 if (c->x86 == 6 && c->x86_model < 15)
255 clear_cpu_cap(c, X86_FEATURE_PAT);
258 * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
259 * clear the fast string and enhanced fast string CPU capabilities.
261 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
262 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
263 if (!(misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING)) {
264 pr_info("Disabled fast string operations\n");
265 setup_clear_cpu_cap(X86_FEATURE_REP_GOOD);
266 setup_clear_cpu_cap(X86_FEATURE_ERMS);
271 * Intel Quark Core DevMan_001.pdf section 6.4.11
272 * "The operating system also is required to invalidate (i.e., flush)
273 * the TLB when any changes are made to any of the page table entries.
274 * The operating system must reload CR3 to cause the TLB to be flushed"
276 * As a result, boot_cpu_has(X86_FEATURE_PGE) in arch/x86/include/asm/tlbflush.h
277 * should be false so that __flush_tlb_all() causes CR3 insted of CR4.PGE
280 if (c->x86 == 5 && c->x86_model == 9) {
281 pr_info("Disabling PGE capability bit\n");
282 setup_clear_cpu_cap(X86_FEATURE_PGE);
285 if (c->cpuid_level >= 0x00000001) {
286 u32 eax, ebx, ecx, edx;
288 cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
290 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
291 * apicids which are reserved per package. Store the resulting
292 * shift value for the package management code.
294 if (edx & (1U << 28))
295 c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
298 check_memory_type_self_snoop_errata(c);
301 * Get the number of SMT siblings early from the extended topology
302 * leaf, if available. Otherwise try the legacy SMT detection.
304 if (detect_extended_topology_early(c) < 0)
310 * Early probe support logic for ppro memory erratum #50
312 * This is called before we do cpu ident work
315 int ppro_with_ram_bug(void)
317 /* Uses data from early_cpu_detect now */
318 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
319 boot_cpu_data.x86 == 6 &&
320 boot_cpu_data.x86_model == 1 &&
321 boot_cpu_data.x86_stepping < 8) {
322 pr_info("Pentium Pro with Errata#50 detected. Taking evasive action.\n");
328 static void intel_smp_check(struct cpuinfo_x86 *c)
330 /* calling is from identify_secondary_cpu() ? */
335 * Mask B, Pentium, but not Pentium MMX
338 c->x86_stepping >= 1 && c->x86_stepping <= 4 &&
341 * Remember we have B step Pentia with bugs
343 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
344 "with B stepping processors.\n");
349 static int __init forcepae_setup(char *__unused)
354 __setup("forcepae", forcepae_setup);
356 static void intel_workarounds(struct cpuinfo_x86 *c)
358 #ifdef CONFIG_X86_F00F_BUG
360 * All models of Pentium and Pentium with MMX technology CPUs
361 * have the F0 0F bug, which lets nonprivileged users lock up the
362 * system. Announce that the fault handler will be checking for it.
363 * The Quark is also family 5, but does not have the same bug.
365 clear_cpu_bug(c, X86_BUG_F00F);
366 if (c->x86 == 5 && c->x86_model < 9) {
367 static int f00f_workaround_enabled;
369 set_cpu_bug(c, X86_BUG_F00F);
370 if (!f00f_workaround_enabled) {
371 pr_notice("Intel Pentium with F0 0F bug - workaround enabled.\n");
372 f00f_workaround_enabled = 1;
378 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
381 if ((c->x86<<8 | c->x86_model<<4 | c->x86_stepping) < 0x633)
382 clear_cpu_cap(c, X86_FEATURE_SEP);
385 * PAE CPUID issue: many Pentium M report no PAE but may have a
386 * functionally usable PAE implementation.
387 * Forcefully enable PAE if kernel parameter "forcepae" is present.
390 pr_warn("PAE forced!\n");
391 set_cpu_cap(c, X86_FEATURE_PAE);
392 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
396 * P4 Xeon erratum 037 workaround.
397 * Hardware prefetcher may cause stale data to be loaded into the cache.
399 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_stepping == 1)) {
400 if (msr_set_bit(MSR_IA32_MISC_ENABLE,
401 MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE_BIT) > 0) {
402 pr_info("CPU: C0 stepping P4 Xeon detected.\n");
403 pr_info("CPU: Disabling hardware prefetching (Erratum 037)\n");
408 * See if we have a good local APIC by checking for buggy Pentia,
409 * i.e. all B steppings and the C2 stepping of P54C when using their
410 * integrated APIC (see 11AP erratum in "Pentium Processor
411 * Specification Update").
413 if (boot_cpu_has(X86_FEATURE_APIC) && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
414 (c->x86_stepping < 0x6 || c->x86_stepping == 0xb))
415 set_cpu_bug(c, X86_BUG_11AP);
418 #ifdef CONFIG_X86_INTEL_USERCOPY
420 * Set up the preferred alignment for movsl bulk memory moves
423 case 4: /* 486: untested */
425 case 5: /* Old Pentia: untested */
427 case 6: /* PII/PIII only like movsl with 8-byte alignment */
430 case 15: /* P4 is OK down to 8-byte alignment */
439 static void intel_workarounds(struct cpuinfo_x86 *c)
444 static void srat_detect_node(struct cpuinfo_x86 *c)
448 int cpu = smp_processor_id();
450 /* Don't do the funky fallback heuristics the AMD version employs
452 node = numa_cpu_node(cpu);
453 if (node == NUMA_NO_NODE || !node_online(node)) {
454 /* reuse the value from init_cpu_to_node() */
455 node = cpu_to_node(cpu);
457 numa_set_node(cpu, node);
461 #define MSR_IA32_TME_ACTIVATE 0x982
463 /* Helpers to access TME_ACTIVATE MSR */
464 #define TME_ACTIVATE_LOCKED(x) (x & 0x1)
465 #define TME_ACTIVATE_ENABLED(x) (x & 0x2)
467 #define TME_ACTIVATE_POLICY(x) ((x >> 4) & 0xf) /* Bits 7:4 */
468 #define TME_ACTIVATE_POLICY_AES_XTS_128 0
470 #define TME_ACTIVATE_KEYID_BITS(x) ((x >> 32) & 0xf) /* Bits 35:32 */
472 #define TME_ACTIVATE_CRYPTO_ALGS(x) ((x >> 48) & 0xffff) /* Bits 63:48 */
473 #define TME_ACTIVATE_CRYPTO_AES_XTS_128 1
475 /* Values for mktme_status (SW only construct) */
476 #define MKTME_ENABLED 0
477 #define MKTME_DISABLED 1
478 #define MKTME_UNINITIALIZED 2
479 static int mktme_status = MKTME_UNINITIALIZED;
481 static void detect_tme(struct cpuinfo_x86 *c)
483 u64 tme_activate, tme_policy, tme_crypto_algs;
484 int keyid_bits = 0, nr_keyids = 0;
485 static u64 tme_activate_cpu0 = 0;
487 rdmsrl(MSR_IA32_TME_ACTIVATE, tme_activate);
489 if (mktme_status != MKTME_UNINITIALIZED) {
490 if (tme_activate != tme_activate_cpu0) {
492 pr_err_once("x86/tme: configuration is inconsistent between CPUs\n");
493 pr_err_once("x86/tme: MKTME is not usable\n");
494 mktme_status = MKTME_DISABLED;
496 /* Proceed. We may need to exclude bits from x86_phys_bits. */
499 tme_activate_cpu0 = tme_activate;
502 if (!TME_ACTIVATE_LOCKED(tme_activate) || !TME_ACTIVATE_ENABLED(tme_activate)) {
503 pr_info_once("x86/tme: not enabled by BIOS\n");
504 mktme_status = MKTME_DISABLED;
508 if (mktme_status != MKTME_UNINITIALIZED)
509 goto detect_keyid_bits;
511 pr_info("x86/tme: enabled by BIOS\n");
513 tme_policy = TME_ACTIVATE_POLICY(tme_activate);
514 if (tme_policy != TME_ACTIVATE_POLICY_AES_XTS_128)
515 pr_warn("x86/tme: Unknown policy is active: %#llx\n", tme_policy);
517 tme_crypto_algs = TME_ACTIVATE_CRYPTO_ALGS(tme_activate);
518 if (!(tme_crypto_algs & TME_ACTIVATE_CRYPTO_AES_XTS_128)) {
519 pr_err("x86/mktme: No known encryption algorithm is supported: %#llx\n",
521 mktme_status = MKTME_DISABLED;
524 keyid_bits = TME_ACTIVATE_KEYID_BITS(tme_activate);
525 nr_keyids = (1UL << keyid_bits) - 1;
527 pr_info_once("x86/mktme: enabled by BIOS\n");
528 pr_info_once("x86/mktme: %d KeyIDs available\n", nr_keyids);
530 pr_info_once("x86/mktme: disabled by BIOS\n");
533 if (mktme_status == MKTME_UNINITIALIZED) {
534 /* MKTME is usable */
535 mktme_status = MKTME_ENABLED;
539 * KeyID bits effectively lower the number of physical address
540 * bits. Update cpuinfo_x86::x86_phys_bits accordingly.
542 c->x86_phys_bits -= keyid_bits;
545 static void init_cpuid_fault(struct cpuinfo_x86 *c)
549 if (!rdmsrl_safe(MSR_PLATFORM_INFO, &msr)) {
550 if (msr & MSR_PLATFORM_INFO_CPUID_FAULT)
551 set_cpu_cap(c, X86_FEATURE_CPUID_FAULT);
555 static void init_intel_misc_features(struct cpuinfo_x86 *c)
559 if (rdmsrl_safe(MSR_MISC_FEATURES_ENABLES, &msr))
562 /* Clear all MISC features */
563 this_cpu_write(msr_misc_features_shadow, 0);
565 /* Check features and update capabilities and shadow control bits */
567 probe_xeon_phi_r3mwait(c);
569 msr = this_cpu_read(msr_misc_features_shadow);
570 wrmsrl(MSR_MISC_FEATURES_ENABLES, msr);
573 static void init_intel(struct cpuinfo_x86 *c)
577 intel_workarounds(c);
580 * Detect the extended topology information if available. This
581 * will reinitialise the initial_apicid which will be used
582 * in init_intel_cacheinfo()
584 detect_extended_topology(c);
586 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
588 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
591 detect_num_cpu_cores(c);
597 init_intel_cacheinfo(c);
599 if (c->cpuid_level > 9) {
600 unsigned eax = cpuid_eax(10);
601 /* Check for version and the number of counters */
602 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
603 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
606 if (cpu_has(c, X86_FEATURE_XMM2))
607 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
609 if (boot_cpu_has(X86_FEATURE_DS)) {
612 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
614 set_cpu_cap(c, X86_FEATURE_BTS);
616 set_cpu_cap(c, X86_FEATURE_PEBS);
619 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_CLFLUSH) &&
620 (c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47))
621 set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR);
623 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_MWAIT) &&
624 ((c->x86_model == INTEL_FAM6_ATOM_GOLDMONT)))
625 set_cpu_bug(c, X86_BUG_MONITOR);
629 c->x86_cache_alignment = c->x86_clflush_size * 2;
631 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
634 * Names for the Pentium II/Celeron processors
635 * detectable only by also checking the cache size.
636 * Dixon is NOT a Celeron.
639 unsigned int l2 = c->x86_cache_size;
642 switch (c->x86_model) {
645 p = "Celeron (Covington)";
647 p = "Mobile Pentium II (Dixon)";
652 p = "Celeron (Mendocino)";
653 else if (c->x86_stepping == 0 || c->x86_stepping == 5)
659 p = "Celeron (Coppermine)";
664 strcpy(c->x86_model_id, p);
668 set_cpu_cap(c, X86_FEATURE_P4);
670 set_cpu_cap(c, X86_FEATURE_P3);
673 /* Work around errata */
676 init_ia32_feat_ctl(c);
678 if (cpu_has(c, X86_FEATURE_TME))
681 init_intel_misc_features(c);
683 if (tsx_ctrl_state == TSX_CTRL_ENABLE)
685 if (tsx_ctrl_state == TSX_CTRL_DISABLE)
690 static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
693 * Intel PIII Tualatin. This comes in two flavours.
694 * One has 256kb of cache, the other 512. We have no way
695 * to determine which, so we use a boottime override
696 * for the 512kb model, and assume 256 otherwise.
698 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
702 * Intel Quark SoC X1000 contains a 4-way set associative
703 * 16K cache with a 16 byte cache line and 256 lines per tag
705 if ((c->x86 == 5) && (c->x86_model == 9))
711 #define TLB_INST_4K 0x01
712 #define TLB_INST_4M 0x02
713 #define TLB_INST_2M_4M 0x03
715 #define TLB_INST_ALL 0x05
716 #define TLB_INST_1G 0x06
718 #define TLB_DATA_4K 0x11
719 #define TLB_DATA_4M 0x12
720 #define TLB_DATA_2M_4M 0x13
721 #define TLB_DATA_4K_4M 0x14
723 #define TLB_DATA_1G 0x16
725 #define TLB_DATA0_4K 0x21
726 #define TLB_DATA0_4M 0x22
727 #define TLB_DATA0_2M_4M 0x23
730 #define STLB_4K_2M 0x42
732 static const struct _tlb_table intel_tlb_table[] = {
733 { 0x01, TLB_INST_4K, 32, " TLB_INST 4 KByte pages, 4-way set associative" },
734 { 0x02, TLB_INST_4M, 2, " TLB_INST 4 MByte pages, full associative" },
735 { 0x03, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way set associative" },
736 { 0x04, TLB_DATA_4M, 8, " TLB_DATA 4 MByte pages, 4-way set associative" },
737 { 0x05, TLB_DATA_4M, 32, " TLB_DATA 4 MByte pages, 4-way set associative" },
738 { 0x0b, TLB_INST_4M, 4, " TLB_INST 4 MByte pages, 4-way set associative" },
739 { 0x4f, TLB_INST_4K, 32, " TLB_INST 4 KByte pages" },
740 { 0x50, TLB_INST_ALL, 64, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
741 { 0x51, TLB_INST_ALL, 128, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
742 { 0x52, TLB_INST_ALL, 256, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
743 { 0x55, TLB_INST_2M_4M, 7, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
744 { 0x56, TLB_DATA0_4M, 16, " TLB_DATA0 4 MByte pages, 4-way set associative" },
745 { 0x57, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, 4-way associative" },
746 { 0x59, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, fully associative" },
747 { 0x5a, TLB_DATA0_2M_4M, 32, " TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative" },
748 { 0x5b, TLB_DATA_4K_4M, 64, " TLB_DATA 4 KByte and 4 MByte pages" },
749 { 0x5c, TLB_DATA_4K_4M, 128, " TLB_DATA 4 KByte and 4 MByte pages" },
750 { 0x5d, TLB_DATA_4K_4M, 256, " TLB_DATA 4 KByte and 4 MByte pages" },
751 { 0x61, TLB_INST_4K, 48, " TLB_INST 4 KByte pages, full associative" },
752 { 0x63, TLB_DATA_1G, 4, " TLB_DATA 1 GByte pages, 4-way set associative" },
753 { 0x6b, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 8-way associative" },
754 { 0x6c, TLB_DATA_2M_4M, 128, " TLB_DATA 2 MByte or 4 MByte pages, 8-way associative" },
755 { 0x6d, TLB_DATA_1G, 16, " TLB_DATA 1 GByte pages, fully associative" },
756 { 0x76, TLB_INST_2M_4M, 8, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
757 { 0xb0, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 4-way set associative" },
758 { 0xb1, TLB_INST_2M_4M, 4, " TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries" },
759 { 0xb2, TLB_INST_4K, 64, " TLB_INST 4KByte pages, 4-way set associative" },
760 { 0xb3, TLB_DATA_4K, 128, " TLB_DATA 4 KByte pages, 4-way set associative" },
761 { 0xb4, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 4-way associative" },
762 { 0xb5, TLB_INST_4K, 64, " TLB_INST 4 KByte pages, 8-way set associative" },
763 { 0xb6, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 8-way set associative" },
764 { 0xba, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way associative" },
765 { 0xc0, TLB_DATA_4K_4M, 8, " TLB_DATA 4 KByte and 4 MByte pages, 4-way associative" },
766 { 0xc1, STLB_4K_2M, 1024, " STLB 4 KByte and 2 MByte pages, 8-way associative" },
767 { 0xc2, TLB_DATA_2M_4M, 16, " TLB_DATA 2 MByte/4MByte pages, 4-way associative" },
768 { 0xca, STLB_4K, 512, " STLB 4 KByte pages, 4-way associative" },
772 static void intel_tlb_lookup(const unsigned char desc)
778 /* look up this descriptor in the table */
779 for (k = 0; intel_tlb_table[k].descriptor != desc &&
780 intel_tlb_table[k].descriptor != 0; k++)
783 if (intel_tlb_table[k].tlb_type == 0)
786 switch (intel_tlb_table[k].tlb_type) {
788 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
789 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
790 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
791 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
794 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
795 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
796 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
797 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
798 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
799 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
800 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
801 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
802 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
803 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
804 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
805 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
808 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
809 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
810 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
811 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
812 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
813 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
816 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
817 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
820 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
821 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
824 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
825 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
826 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
827 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
831 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
832 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
836 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
837 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
840 case TLB_DATA0_2M_4M:
841 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
842 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
843 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
844 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
847 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
848 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
849 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
850 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
853 if (tlb_lld_1g[ENTRIES] < intel_tlb_table[k].entries)
854 tlb_lld_1g[ENTRIES] = intel_tlb_table[k].entries;
859 static void intel_detect_tlb(struct cpuinfo_x86 *c)
862 unsigned int regs[4];
863 unsigned char *desc = (unsigned char *)regs;
865 if (c->cpuid_level < 2)
868 /* Number of times to iterate */
869 n = cpuid_eax(2) & 0xFF;
871 for (i = 0 ; i < n ; i++) {
872 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
874 /* If bit 31 is set, this is an unknown format */
875 for (j = 0 ; j < 3 ; j++)
876 if (regs[j] & (1 << 31))
879 /* Byte 0 is level count, not a descriptor */
880 for (j = 1 ; j < 16 ; j++)
881 intel_tlb_lookup(desc[j]);
885 static const struct cpu_dev intel_cpu_dev = {
887 .c_ident = { "GenuineIntel" },
890 { .family = 4, .model_names =
892 [0] = "486 DX-25/33",
903 { .family = 5, .model_names =
905 [0] = "Pentium 60/66 A-step",
906 [1] = "Pentium 60/66",
907 [2] = "Pentium 75 - 200",
908 [3] = "OverDrive PODP5V83",
910 [7] = "Mobile Pentium 75 - 200",
911 [8] = "Mobile Pentium MMX",
912 [9] = "Quark SoC X1000",
915 { .family = 6, .model_names =
917 [0] = "Pentium Pro A-step",
919 [3] = "Pentium II (Klamath)",
920 [4] = "Pentium II (Deschutes)",
921 [5] = "Pentium II (Deschutes)",
922 [6] = "Mobile Pentium II",
923 [7] = "Pentium III (Katmai)",
924 [8] = "Pentium III (Coppermine)",
925 [10] = "Pentium III (Cascades)",
926 [11] = "Pentium III (Tualatin)",
929 { .family = 15, .model_names =
931 [0] = "Pentium 4 (Unknown)",
932 [1] = "Pentium 4 (Willamette)",
933 [2] = "Pentium 4 (Northwood)",
934 [4] = "Pentium 4 (Foster)",
935 [5] = "Pentium 4 (Foster)",
939 .legacy_cache_size = intel_size_cache,
941 .c_detect_tlb = intel_detect_tlb,
942 .c_early_init = early_init_intel,
943 .c_init = init_intel,
944 .c_x86_vendor = X86_VENDOR_INTEL,
947 cpu_dev_register(intel_cpu_dev);