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 * Just in case our CPU detection goes bad, or you have a weird system,
36 * allow a way to override the automatic disabling of MPX.
40 static int __init forcempx_setup(char *__unused)
46 __setup("intel-skd-046-workaround=disable", forcempx_setup);
48 void check_mpx_erratum(struct cpuinfo_x86 *c)
53 * Turn off the MPX feature on CPUs where SMEP is not
54 * available or disabled.
56 * Works around Intel Erratum SKD046: "Branch Instructions
57 * May Initialize MPX Bound Registers Incorrectly".
59 * This might falsely disable MPX on systems without
60 * SMEP, like Atom processors without SMEP. But there
61 * is no such hardware known at the moment.
63 if (cpu_has(c, X86_FEATURE_MPX) && !cpu_has(c, X86_FEATURE_SMEP)) {
64 setup_clear_cpu_cap(X86_FEATURE_MPX);
65 pr_warn("x86/mpx: Disabling MPX since SMEP not present\n");
69 static bool ring3mwait_disabled __read_mostly;
71 static int __init ring3mwait_disable(char *__unused)
73 ring3mwait_disabled = true;
76 __setup("ring3mwait=disable", ring3mwait_disable);
78 static void probe_xeon_phi_r3mwait(struct cpuinfo_x86 *c)
81 * Ring 3 MONITOR/MWAIT feature cannot be detected without
82 * cpu model and family comparison.
86 switch (c->x86_model) {
87 case INTEL_FAM6_XEON_PHI_KNL:
88 case INTEL_FAM6_XEON_PHI_KNM:
94 if (ring3mwait_disabled)
97 set_cpu_cap(c, X86_FEATURE_RING3MWAIT);
98 this_cpu_or(msr_misc_features_shadow,
99 1UL << MSR_MISC_FEATURES_ENABLES_RING3MWAIT_BIT);
101 if (c == &boot_cpu_data)
102 ELF_HWCAP2 |= HWCAP2_RING3MWAIT;
106 * Early microcode releases for the Spectre v2 mitigation were broken.
107 * Information taken from;
108 * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/01/microcode-update-guidance.pdf
109 * - https://kb.vmware.com/s/article/52345
110 * - Microcode revisions observed in the wild
111 * - Release note from 20180108 microcode release
113 struct sku_microcode {
118 static const struct sku_microcode spectre_bad_microcodes[] = {
119 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0B, 0x80 },
120 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0A, 0x80 },
121 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x09, 0x80 },
122 { INTEL_FAM6_KABYLAKE_MOBILE, 0x0A, 0x80 },
123 { INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x80 },
124 { INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e },
125 { INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003c },
126 { INTEL_FAM6_SKYLAKE_DESKTOP, 0x03, 0xc2 },
127 { INTEL_FAM6_BROADWELL_CORE, 0x04, 0x28 },
128 { INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x1b },
129 { INTEL_FAM6_BROADWELL_XEON_D, 0x02, 0x14 },
130 { INTEL_FAM6_BROADWELL_XEON_D, 0x03, 0x07000011 },
131 { INTEL_FAM6_BROADWELL_X, 0x01, 0x0b000025 },
132 { INTEL_FAM6_HASWELL_ULT, 0x01, 0x21 },
133 { INTEL_FAM6_HASWELL_GT3E, 0x01, 0x18 },
134 { INTEL_FAM6_HASWELL_CORE, 0x03, 0x23 },
135 { INTEL_FAM6_HASWELL_X, 0x02, 0x3b },
136 { INTEL_FAM6_HASWELL_X, 0x04, 0x10 },
137 { INTEL_FAM6_IVYBRIDGE_X, 0x04, 0x42a },
138 /* Observed in the wild */
139 { INTEL_FAM6_SANDYBRIDGE_X, 0x06, 0x61b },
140 { INTEL_FAM6_SANDYBRIDGE_X, 0x07, 0x712 },
143 static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
148 * We know that the hypervisor lie to us on the microcode version so
149 * we may as well hope that it is running the correct version.
151 if (cpu_has(c, X86_FEATURE_HYPERVISOR))
154 for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
155 if (c->x86_model == spectre_bad_microcodes[i].model &&
156 c->x86_stepping == spectre_bad_microcodes[i].stepping)
157 return (c->microcode <= spectre_bad_microcodes[i].microcode);
162 static void early_init_intel(struct cpuinfo_x86 *c)
166 /* Unmask CPUID levels if masked: */
167 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
168 if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
169 MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) {
170 c->cpuid_level = cpuid_eax(0);
175 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
176 (c->x86 == 0x6 && c->x86_model >= 0x0e))
177 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
179 if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64))
180 c->microcode = intel_get_microcode_revision();
182 /* Now if any of them are set, check the blacklist and clear the lot */
183 if ((cpu_has(c, X86_FEATURE_SPEC_CTRL) ||
184 cpu_has(c, X86_FEATURE_INTEL_STIBP) ||
185 cpu_has(c, X86_FEATURE_IBRS) || cpu_has(c, X86_FEATURE_IBPB) ||
186 cpu_has(c, X86_FEATURE_STIBP)) && bad_spectre_microcode(c)) {
187 pr_warn("Intel Spectre v2 broken microcode detected; disabling Speculation Control\n");
188 setup_clear_cpu_cap(X86_FEATURE_IBRS);
189 setup_clear_cpu_cap(X86_FEATURE_IBPB);
190 setup_clear_cpu_cap(X86_FEATURE_STIBP);
191 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL);
192 setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP);
196 * Atom erratum AAE44/AAF40/AAG38/AAH41:
198 * A race condition between speculative fetches and invalidating
199 * a large page. This is worked around in microcode, but we
200 * need the microcode to have already been loaded... so if it is
201 * not, recommend a BIOS update and disable large pages.
203 if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_stepping <= 2 &&
204 c->microcode < 0x20e) {
205 pr_warn("Atom PSE erratum detected, BIOS microcode update recommended\n");
206 clear_cpu_cap(c, X86_FEATURE_PSE);
210 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
212 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
213 if (c->x86 == 15 && c->x86_cache_alignment == 64)
214 c->x86_cache_alignment = 128;
217 /* CPUID workaround for 0F33/0F34 CPU */
218 if (c->x86 == 0xF && c->x86_model == 0x3
219 && (c->x86_stepping == 0x3 || c->x86_stepping == 0x4))
220 c->x86_phys_bits = 36;
223 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
224 * with P/T states and does not stop in deep C-states.
226 * It is also reliable across cores and sockets. (but not across
227 * cabinets - we turn it off in that case explicitly.)
229 if (c->x86_power & (1 << 8)) {
230 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
231 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
234 /* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
236 switch (c->x86_model) {
237 case 0x27: /* Penwell */
238 case 0x35: /* Cloverview */
239 case 0x4a: /* Merrifield */
240 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
248 * There is a known erratum on Pentium III and Core Solo
250 * " Page with PAT set to WC while associated MTRR is UC
251 * may consolidate to UC "
252 * Because of this erratum, it is better to stick with
253 * setting WC in MTRR rather than using PAT on these CPUs.
255 * Enable PAT WC only on P4, Core 2 or later CPUs.
257 if (c->x86 == 6 && c->x86_model < 15)
258 clear_cpu_cap(c, X86_FEATURE_PAT);
261 * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
262 * clear the fast string and enhanced fast string CPU capabilities.
264 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
265 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
266 if (!(misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING)) {
267 pr_info("Disabled fast string operations\n");
268 setup_clear_cpu_cap(X86_FEATURE_REP_GOOD);
269 setup_clear_cpu_cap(X86_FEATURE_ERMS);
274 * Intel Quark Core DevMan_001.pdf section 6.4.11
275 * "The operating system also is required to invalidate (i.e., flush)
276 * the TLB when any changes are made to any of the page table entries.
277 * The operating system must reload CR3 to cause the TLB to be flushed"
279 * As a result, boot_cpu_has(X86_FEATURE_PGE) in arch/x86/include/asm/tlbflush.h
280 * should be false so that __flush_tlb_all() causes CR3 insted of CR4.PGE
283 if (c->x86 == 5 && c->x86_model == 9) {
284 pr_info("Disabling PGE capability bit\n");
285 setup_clear_cpu_cap(X86_FEATURE_PGE);
288 if (c->cpuid_level >= 0x00000001) {
289 u32 eax, ebx, ecx, edx;
291 cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
293 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
294 * apicids which are reserved per package. Store the resulting
295 * shift value for the package management code.
297 if (edx & (1U << 28))
298 c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
301 check_mpx_erratum(c);
306 * Early probe support logic for ppro memory erratum #50
308 * This is called before we do cpu ident work
311 int ppro_with_ram_bug(void)
313 /* Uses data from early_cpu_detect now */
314 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
315 boot_cpu_data.x86 == 6 &&
316 boot_cpu_data.x86_model == 1 &&
317 boot_cpu_data.x86_stepping < 8) {
318 pr_info("Pentium Pro with Errata#50 detected. Taking evasive action.\n");
324 static void intel_smp_check(struct cpuinfo_x86 *c)
326 /* calling is from identify_secondary_cpu() ? */
331 * Mask B, Pentium, but not Pentium MMX
334 c->x86_stepping >= 1 && c->x86_stepping <= 4 &&
337 * Remember we have B step Pentia with bugs
339 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
340 "with B stepping processors.\n");
345 static int __init forcepae_setup(char *__unused)
350 __setup("forcepae", forcepae_setup);
352 static void intel_workarounds(struct cpuinfo_x86 *c)
354 #ifdef CONFIG_X86_F00F_BUG
356 * All models of Pentium and Pentium with MMX technology CPUs
357 * have the F0 0F bug, which lets nonprivileged users lock up the
358 * system. Announce that the fault handler will be checking for it.
359 * The Quark is also family 5, but does not have the same bug.
361 clear_cpu_bug(c, X86_BUG_F00F);
362 if (c->x86 == 5 && c->x86_model < 9) {
363 static int f00f_workaround_enabled;
365 set_cpu_bug(c, X86_BUG_F00F);
366 if (!f00f_workaround_enabled) {
367 pr_notice("Intel Pentium with F0 0F bug - workaround enabled.\n");
368 f00f_workaround_enabled = 1;
374 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
377 if ((c->x86<<8 | c->x86_model<<4 | c->x86_stepping) < 0x633)
378 clear_cpu_cap(c, X86_FEATURE_SEP);
381 * PAE CPUID issue: many Pentium M report no PAE but may have a
382 * functionally usable PAE implementation.
383 * Forcefully enable PAE if kernel parameter "forcepae" is present.
386 pr_warn("PAE forced!\n");
387 set_cpu_cap(c, X86_FEATURE_PAE);
388 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
392 * P4 Xeon erratum 037 workaround.
393 * Hardware prefetcher may cause stale data to be loaded into the cache.
395 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_stepping == 1)) {
396 if (msr_set_bit(MSR_IA32_MISC_ENABLE,
397 MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE_BIT) > 0) {
398 pr_info("CPU: C0 stepping P4 Xeon detected.\n");
399 pr_info("CPU: Disabling hardware prefetching (Erratum 037)\n");
404 * See if we have a good local APIC by checking for buggy Pentia,
405 * i.e. all B steppings and the C2 stepping of P54C when using their
406 * integrated APIC (see 11AP erratum in "Pentium Processor
407 * Specification Update").
409 if (boot_cpu_has(X86_FEATURE_APIC) && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
410 (c->x86_stepping < 0x6 || c->x86_stepping == 0xb))
411 set_cpu_bug(c, X86_BUG_11AP);
414 #ifdef CONFIG_X86_INTEL_USERCOPY
416 * Set up the preferred alignment for movsl bulk memory moves
419 case 4: /* 486: untested */
421 case 5: /* Old Pentia: untested */
423 case 6: /* PII/PIII only like movsl with 8-byte alignment */
426 case 15: /* P4 is OK down to 8-byte alignment */
435 static void intel_workarounds(struct cpuinfo_x86 *c)
440 static void srat_detect_node(struct cpuinfo_x86 *c)
444 int cpu = smp_processor_id();
446 /* Don't do the funky fallback heuristics the AMD version employs
448 node = numa_cpu_node(cpu);
449 if (node == NUMA_NO_NODE || !node_online(node)) {
450 /* reuse the value from init_cpu_to_node() */
451 node = cpu_to_node(cpu);
453 numa_set_node(cpu, node);
458 * find out the number of processor cores on the die
460 static int intel_num_cpu_cores(struct cpuinfo_x86 *c)
462 unsigned int eax, ebx, ecx, edx;
464 if (!IS_ENABLED(CONFIG_SMP) || c->cpuid_level < 4)
467 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
468 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
470 return (eax >> 26) + 1;
475 static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
477 /* Intel VMX MSR indicated features */
478 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
479 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
480 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
481 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
482 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
483 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
485 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
487 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
488 clear_cpu_cap(c, X86_FEATURE_VNMI);
489 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
490 clear_cpu_cap(c, X86_FEATURE_EPT);
491 clear_cpu_cap(c, X86_FEATURE_VPID);
493 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
494 msr_ctl = vmx_msr_high | vmx_msr_low;
495 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
496 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
497 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
498 set_cpu_cap(c, X86_FEATURE_VNMI);
499 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
500 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
501 vmx_msr_low, vmx_msr_high);
502 msr_ctl2 = vmx_msr_high | vmx_msr_low;
503 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
504 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
505 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
506 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
507 set_cpu_cap(c, X86_FEATURE_EPT);
508 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
509 set_cpu_cap(c, X86_FEATURE_VPID);
513 static void init_intel_energy_perf(struct cpuinfo_x86 *c)
518 * Initialize MSR_IA32_ENERGY_PERF_BIAS if not already initialized.
519 * (x86_energy_perf_policy(8) is available to change it at run-time.)
521 if (!cpu_has(c, X86_FEATURE_EPB))
524 rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
525 if ((epb & 0xF) != ENERGY_PERF_BIAS_PERFORMANCE)
528 pr_warn_once("ENERGY_PERF_BIAS: Set to 'normal', was 'performance'\n");
529 pr_warn_once("ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)\n");
530 epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
531 wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
534 static void intel_bsp_resume(struct cpuinfo_x86 *c)
537 * MSR_IA32_ENERGY_PERF_BIAS is lost across suspend/resume,
538 * so reinitialize it properly like during bootup:
540 init_intel_energy_perf(c);
543 static void init_cpuid_fault(struct cpuinfo_x86 *c)
547 if (!rdmsrl_safe(MSR_PLATFORM_INFO, &msr)) {
548 if (msr & MSR_PLATFORM_INFO_CPUID_FAULT)
549 set_cpu_cap(c, X86_FEATURE_CPUID_FAULT);
553 static void init_intel_misc_features(struct cpuinfo_x86 *c)
557 if (rdmsrl_safe(MSR_MISC_FEATURES_ENABLES, &msr))
560 /* Clear all MISC features */
561 this_cpu_write(msr_misc_features_shadow, 0);
563 /* Check features and update capabilities and shadow control bits */
565 probe_xeon_phi_r3mwait(c);
567 msr = this_cpu_read(msr_misc_features_shadow);
568 wrmsrl(MSR_MISC_FEATURES_ENABLES, msr);
571 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 c->x86_max_cores = intel_num_cpu_cores(c);
597 l2 = init_intel_cacheinfo(c);
599 /* Detect legacy cache sizes if init_intel_cacheinfo did not */
601 cpu_detect_cache_sizes(c);
602 l2 = c->x86_cache_size;
605 if (c->cpuid_level > 9) {
606 unsigned eax = cpuid_eax(10);
607 /* Check for version and the number of counters */
608 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
609 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
612 if (cpu_has(c, X86_FEATURE_XMM2))
613 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
615 if (boot_cpu_has(X86_FEATURE_DS)) {
617 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
619 set_cpu_cap(c, X86_FEATURE_BTS);
621 set_cpu_cap(c, X86_FEATURE_PEBS);
624 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_CLFLUSH) &&
625 (c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47))
626 set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR);
628 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_MWAIT) &&
629 ((c->x86_model == INTEL_FAM6_ATOM_GOLDMONT)))
630 set_cpu_bug(c, X86_BUG_MONITOR);
634 c->x86_cache_alignment = c->x86_clflush_size * 2;
636 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
639 * Names for the Pentium II/Celeron processors
640 * detectable only by also checking the cache size.
641 * Dixon is NOT a Celeron.
646 switch (c->x86_model) {
649 p = "Celeron (Covington)";
651 p = "Mobile Pentium II (Dixon)";
656 p = "Celeron (Mendocino)";
657 else if (c->x86_stepping == 0 || c->x86_stepping == 5)
663 p = "Celeron (Coppermine)";
668 strcpy(c->x86_model_id, p);
672 set_cpu_cap(c, X86_FEATURE_P4);
674 set_cpu_cap(c, X86_FEATURE_P3);
677 /* Work around errata */
680 if (cpu_has(c, X86_FEATURE_VMX))
681 detect_vmx_virtcap(c);
683 init_intel_energy_perf(c);
685 init_intel_misc_features(c);
689 static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
692 * Intel PIII Tualatin. This comes in two flavours.
693 * One has 256kb of cache, the other 512. We have no way
694 * to determine which, so we use a boottime override
695 * for the 512kb model, and assume 256 otherwise.
697 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
701 * Intel Quark SoC X1000 contains a 4-way set associative
702 * 16K cache with a 16 byte cache line and 256 lines per tag
704 if ((c->x86 == 5) && (c->x86_model == 9))
710 #define TLB_INST_4K 0x01
711 #define TLB_INST_4M 0x02
712 #define TLB_INST_2M_4M 0x03
714 #define TLB_INST_ALL 0x05
715 #define TLB_INST_1G 0x06
717 #define TLB_DATA_4K 0x11
718 #define TLB_DATA_4M 0x12
719 #define TLB_DATA_2M_4M 0x13
720 #define TLB_DATA_4K_4M 0x14
722 #define TLB_DATA_1G 0x16
724 #define TLB_DATA0_4K 0x21
725 #define TLB_DATA0_4M 0x22
726 #define TLB_DATA0_2M_4M 0x23
729 #define STLB_4K_2M 0x42
731 static const struct _tlb_table intel_tlb_table[] = {
732 { 0x01, TLB_INST_4K, 32, " TLB_INST 4 KByte pages, 4-way set associative" },
733 { 0x02, TLB_INST_4M, 2, " TLB_INST 4 MByte pages, full associative" },
734 { 0x03, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way set associative" },
735 { 0x04, TLB_DATA_4M, 8, " TLB_DATA 4 MByte pages, 4-way set associative" },
736 { 0x05, TLB_DATA_4M, 32, " TLB_DATA 4 MByte pages, 4-way set associative" },
737 { 0x0b, TLB_INST_4M, 4, " TLB_INST 4 MByte pages, 4-way set associative" },
738 { 0x4f, TLB_INST_4K, 32, " TLB_INST 4 KByte pages */" },
739 { 0x50, TLB_INST_ALL, 64, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
740 { 0x51, TLB_INST_ALL, 128, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
741 { 0x52, TLB_INST_ALL, 256, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
742 { 0x55, TLB_INST_2M_4M, 7, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
743 { 0x56, TLB_DATA0_4M, 16, " TLB_DATA0 4 MByte pages, 4-way set associative" },
744 { 0x57, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, 4-way associative" },
745 { 0x59, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, fully associative" },
746 { 0x5a, TLB_DATA0_2M_4M, 32, " TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative" },
747 { 0x5b, TLB_DATA_4K_4M, 64, " TLB_DATA 4 KByte and 4 MByte pages" },
748 { 0x5c, TLB_DATA_4K_4M, 128, " TLB_DATA 4 KByte and 4 MByte pages" },
749 { 0x5d, TLB_DATA_4K_4M, 256, " TLB_DATA 4 KByte and 4 MByte pages" },
750 { 0x61, TLB_INST_4K, 48, " TLB_INST 4 KByte pages, full associative" },
751 { 0x63, TLB_DATA_1G, 4, " TLB_DATA 1 GByte pages, 4-way set associative" },
752 { 0x76, TLB_INST_2M_4M, 8, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
753 { 0xb0, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 4-way set associative" },
754 { 0xb1, TLB_INST_2M_4M, 4, " TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries" },
755 { 0xb2, TLB_INST_4K, 64, " TLB_INST 4KByte pages, 4-way set associative" },
756 { 0xb3, TLB_DATA_4K, 128, " TLB_DATA 4 KByte pages, 4-way set associative" },
757 { 0xb4, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 4-way associative" },
758 { 0xb5, TLB_INST_4K, 64, " TLB_INST 4 KByte pages, 8-way set associative" },
759 { 0xb6, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 8-way set associative" },
760 { 0xba, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way associative" },
761 { 0xc0, TLB_DATA_4K_4M, 8, " TLB_DATA 4 KByte and 4 MByte pages, 4-way associative" },
762 { 0xc1, STLB_4K_2M, 1024, " STLB 4 KByte and 2 MByte pages, 8-way associative" },
763 { 0xc2, TLB_DATA_2M_4M, 16, " DTLB 2 MByte/4MByte pages, 4-way associative" },
764 { 0xca, STLB_4K, 512, " STLB 4 KByte pages, 4-way associative" },
768 static void intel_tlb_lookup(const unsigned char desc)
774 /* look up this descriptor in the table */
775 for (k = 0; intel_tlb_table[k].descriptor != desc && \
776 intel_tlb_table[k].descriptor != 0; k++)
779 if (intel_tlb_table[k].tlb_type == 0)
782 switch (intel_tlb_table[k].tlb_type) {
784 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
785 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
786 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
787 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
790 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
791 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
792 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
793 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
794 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
795 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
796 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
797 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
798 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
799 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
800 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
801 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
804 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
805 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
806 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
807 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
808 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
809 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
812 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
813 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
816 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
817 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
820 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
821 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
822 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
823 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
827 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
828 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
832 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
833 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
836 case TLB_DATA0_2M_4M:
837 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
838 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
839 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
840 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
843 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
844 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
845 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
846 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
849 if (tlb_lld_1g[ENTRIES] < intel_tlb_table[k].entries)
850 tlb_lld_1g[ENTRIES] = intel_tlb_table[k].entries;
855 static void intel_detect_tlb(struct cpuinfo_x86 *c)
858 unsigned int regs[4];
859 unsigned char *desc = (unsigned char *)regs;
861 if (c->cpuid_level < 2)
864 /* Number of times to iterate */
865 n = cpuid_eax(2) & 0xFF;
867 for (i = 0 ; i < n ; i++) {
868 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
870 /* If bit 31 is set, this is an unknown format */
871 for (j = 0 ; j < 3 ; j++)
872 if (regs[j] & (1 << 31))
875 /* Byte 0 is level count, not a descriptor */
876 for (j = 1 ; j < 16 ; j++)
877 intel_tlb_lookup(desc[j]);
881 static const struct cpu_dev intel_cpu_dev = {
883 .c_ident = { "GenuineIntel" },
886 { .family = 4, .model_names =
888 [0] = "486 DX-25/33",
899 { .family = 5, .model_names =
901 [0] = "Pentium 60/66 A-step",
902 [1] = "Pentium 60/66",
903 [2] = "Pentium 75 - 200",
904 [3] = "OverDrive PODP5V83",
906 [7] = "Mobile Pentium 75 - 200",
907 [8] = "Mobile Pentium MMX",
908 [9] = "Quark SoC X1000",
911 { .family = 6, .model_names =
913 [0] = "Pentium Pro A-step",
915 [3] = "Pentium II (Klamath)",
916 [4] = "Pentium II (Deschutes)",
917 [5] = "Pentium II (Deschutes)",
918 [6] = "Mobile Pentium II",
919 [7] = "Pentium III (Katmai)",
920 [8] = "Pentium III (Coppermine)",
921 [10] = "Pentium III (Cascades)",
922 [11] = "Pentium III (Tualatin)",
925 { .family = 15, .model_names =
927 [0] = "Pentium 4 (Unknown)",
928 [1] = "Pentium 4 (Willamette)",
929 [2] = "Pentium 4 (Northwood)",
930 [4] = "Pentium 4 (Foster)",
931 [5] = "Pentium 4 (Foster)",
935 .legacy_cache_size = intel_size_cache,
937 .c_detect_tlb = intel_detect_tlb,
938 .c_early_init = early_init_intel,
939 .c_init = init_intel,
940 .c_bsp_resume = intel_bsp_resume,
941 .c_x86_vendor = X86_VENDOR_INTEL,
944 cpu_dev_register(intel_cpu_dev);