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, 0x84 },
120 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0A, 0x84 },
121 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x09, 0x84 },
122 { INTEL_FAM6_KABYLAKE_MOBILE, 0x0A, 0x84 },
123 { INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x84 },
124 { INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e },
125 { INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003c },
126 { INTEL_FAM6_BROADWELL_CORE, 0x04, 0x28 },
127 { INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x1b },
128 { INTEL_FAM6_BROADWELL_XEON_D, 0x02, 0x14 },
129 { INTEL_FAM6_BROADWELL_XEON_D, 0x03, 0x07000011 },
130 { INTEL_FAM6_BROADWELL_X, 0x01, 0x0b000025 },
131 { INTEL_FAM6_HASWELL_ULT, 0x01, 0x21 },
132 { INTEL_FAM6_HASWELL_GT3E, 0x01, 0x18 },
133 { INTEL_FAM6_HASWELL_CORE, 0x03, 0x23 },
134 { INTEL_FAM6_HASWELL_X, 0x02, 0x3b },
135 { INTEL_FAM6_HASWELL_X, 0x04, 0x10 },
136 { INTEL_FAM6_IVYBRIDGE_X, 0x04, 0x42a },
137 /* Observed in the wild */
138 { INTEL_FAM6_SANDYBRIDGE_X, 0x06, 0x61b },
139 { INTEL_FAM6_SANDYBRIDGE_X, 0x07, 0x712 },
142 static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
146 for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
147 if (c->x86_model == spectre_bad_microcodes[i].model &&
148 c->x86_mask == spectre_bad_microcodes[i].stepping)
149 return (c->microcode <= spectre_bad_microcodes[i].microcode);
154 static void early_init_intel(struct cpuinfo_x86 *c)
158 /* Unmask CPUID levels if masked: */
159 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
160 if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
161 MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) {
162 c->cpuid_level = cpuid_eax(0);
167 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
168 (c->x86 == 0x6 && c->x86_model >= 0x0e))
169 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
171 if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64))
172 c->microcode = intel_get_microcode_revision();
174 /* Now if any of them are set, check the blacklist and clear the lot */
175 if ((cpu_has(c, X86_FEATURE_SPEC_CTRL) ||
176 cpu_has(c, X86_FEATURE_INTEL_STIBP) ||
177 cpu_has(c, X86_FEATURE_IBRS) || cpu_has(c, X86_FEATURE_IBPB) ||
178 cpu_has(c, X86_FEATURE_STIBP)) && bad_spectre_microcode(c)) {
179 pr_warn("Intel Spectre v2 broken microcode detected; disabling Speculation Control\n");
180 setup_clear_cpu_cap(X86_FEATURE_IBRS);
181 setup_clear_cpu_cap(X86_FEATURE_IBPB);
182 setup_clear_cpu_cap(X86_FEATURE_STIBP);
183 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL);
184 setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP);
188 * Atom erratum AAE44/AAF40/AAG38/AAH41:
190 * A race condition between speculative fetches and invalidating
191 * a large page. This is worked around in microcode, but we
192 * need the microcode to have already been loaded... so if it is
193 * not, recommend a BIOS update and disable large pages.
195 if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2 &&
196 c->microcode < 0x20e) {
197 pr_warn("Atom PSE erratum detected, BIOS microcode update recommended\n");
198 clear_cpu_cap(c, X86_FEATURE_PSE);
202 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
204 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
205 if (c->x86 == 15 && c->x86_cache_alignment == 64)
206 c->x86_cache_alignment = 128;
209 /* CPUID workaround for 0F33/0F34 CPU */
210 if (c->x86 == 0xF && c->x86_model == 0x3
211 && (c->x86_mask == 0x3 || c->x86_mask == 0x4))
212 c->x86_phys_bits = 36;
215 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
216 * with P/T states and does not stop in deep C-states.
218 * It is also reliable across cores and sockets. (but not across
219 * cabinets - we turn it off in that case explicitly.)
221 if (c->x86_power & (1 << 8)) {
222 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
223 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
226 /* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
228 switch (c->x86_model) {
229 case 0x27: /* Penwell */
230 case 0x35: /* Cloverview */
231 case 0x4a: /* Merrifield */
232 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
240 * There is a known erratum on Pentium III and Core Solo
242 * " Page with PAT set to WC while associated MTRR is UC
243 * may consolidate to UC "
244 * Because of this erratum, it is better to stick with
245 * setting WC in MTRR rather than using PAT on these CPUs.
247 * Enable PAT WC only on P4, Core 2 or later CPUs.
249 if (c->x86 == 6 && c->x86_model < 15)
250 clear_cpu_cap(c, X86_FEATURE_PAT);
253 * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
254 * clear the fast string and enhanced fast string CPU capabilities.
256 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
257 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
258 if (!(misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING)) {
259 pr_info("Disabled fast string operations\n");
260 setup_clear_cpu_cap(X86_FEATURE_REP_GOOD);
261 setup_clear_cpu_cap(X86_FEATURE_ERMS);
266 * Intel Quark Core DevMan_001.pdf section 6.4.11
267 * "The operating system also is required to invalidate (i.e., flush)
268 * the TLB when any changes are made to any of the page table entries.
269 * The operating system must reload CR3 to cause the TLB to be flushed"
271 * As a result, boot_cpu_has(X86_FEATURE_PGE) in arch/x86/include/asm/tlbflush.h
272 * should be false so that __flush_tlb_all() causes CR3 insted of CR4.PGE
275 if (c->x86 == 5 && c->x86_model == 9) {
276 pr_info("Disabling PGE capability bit\n");
277 setup_clear_cpu_cap(X86_FEATURE_PGE);
280 if (c->cpuid_level >= 0x00000001) {
281 u32 eax, ebx, ecx, edx;
283 cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
285 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
286 * apicids which are reserved per package. Store the resulting
287 * shift value for the package management code.
289 if (edx & (1U << 28))
290 c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
293 check_mpx_erratum(c);
298 * Early probe support logic for ppro memory erratum #50
300 * This is called before we do cpu ident work
303 int ppro_with_ram_bug(void)
305 /* Uses data from early_cpu_detect now */
306 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
307 boot_cpu_data.x86 == 6 &&
308 boot_cpu_data.x86_model == 1 &&
309 boot_cpu_data.x86_mask < 8) {
310 pr_info("Pentium Pro with Errata#50 detected. Taking evasive action.\n");
316 static void intel_smp_check(struct cpuinfo_x86 *c)
318 /* calling is from identify_secondary_cpu() ? */
323 * Mask B, Pentium, but not Pentium MMX
326 c->x86_mask >= 1 && c->x86_mask <= 4 &&
329 * Remember we have B step Pentia with bugs
331 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
332 "with B stepping processors.\n");
337 static int __init forcepae_setup(char *__unused)
342 __setup("forcepae", forcepae_setup);
344 static void intel_workarounds(struct cpuinfo_x86 *c)
346 #ifdef CONFIG_X86_F00F_BUG
348 * All models of Pentium and Pentium with MMX technology CPUs
349 * have the F0 0F bug, which lets nonprivileged users lock up the
350 * system. Announce that the fault handler will be checking for it.
351 * The Quark is also family 5, but does not have the same bug.
353 clear_cpu_bug(c, X86_BUG_F00F);
354 if (c->x86 == 5 && c->x86_model < 9) {
355 static int f00f_workaround_enabled;
357 set_cpu_bug(c, X86_BUG_F00F);
358 if (!f00f_workaround_enabled) {
359 pr_notice("Intel Pentium with F0 0F bug - workaround enabled.\n");
360 f00f_workaround_enabled = 1;
366 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
369 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
370 clear_cpu_cap(c, X86_FEATURE_SEP);
373 * PAE CPUID issue: many Pentium M report no PAE but may have a
374 * functionally usable PAE implementation.
375 * Forcefully enable PAE if kernel parameter "forcepae" is present.
378 pr_warn("PAE forced!\n");
379 set_cpu_cap(c, X86_FEATURE_PAE);
380 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
384 * P4 Xeon erratum 037 workaround.
385 * Hardware prefetcher may cause stale data to be loaded into the cache.
387 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
388 if (msr_set_bit(MSR_IA32_MISC_ENABLE,
389 MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE_BIT) > 0) {
390 pr_info("CPU: C0 stepping P4 Xeon detected.\n");
391 pr_info("CPU: Disabling hardware prefetching (Erratum 037)\n");
396 * See if we have a good local APIC by checking for buggy Pentia,
397 * i.e. all B steppings and the C2 stepping of P54C when using their
398 * integrated APIC (see 11AP erratum in "Pentium Processor
399 * Specification Update").
401 if (boot_cpu_has(X86_FEATURE_APIC) && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
402 (c->x86_mask < 0x6 || c->x86_mask == 0xb))
403 set_cpu_bug(c, X86_BUG_11AP);
406 #ifdef CONFIG_X86_INTEL_USERCOPY
408 * Set up the preferred alignment for movsl bulk memory moves
411 case 4: /* 486: untested */
413 case 5: /* Old Pentia: untested */
415 case 6: /* PII/PIII only like movsl with 8-byte alignment */
418 case 15: /* P4 is OK down to 8-byte alignment */
427 static void intel_workarounds(struct cpuinfo_x86 *c)
432 static void srat_detect_node(struct cpuinfo_x86 *c)
436 int cpu = smp_processor_id();
438 /* Don't do the funky fallback heuristics the AMD version employs
440 node = numa_cpu_node(cpu);
441 if (node == NUMA_NO_NODE || !node_online(node)) {
442 /* reuse the value from init_cpu_to_node() */
443 node = cpu_to_node(cpu);
445 numa_set_node(cpu, node);
450 * find out the number of processor cores on the die
452 static int intel_num_cpu_cores(struct cpuinfo_x86 *c)
454 unsigned int eax, ebx, ecx, edx;
456 if (!IS_ENABLED(CONFIG_SMP) || c->cpuid_level < 4)
459 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
460 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
462 return (eax >> 26) + 1;
467 static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
469 /* Intel VMX MSR indicated features */
470 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
471 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
472 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
473 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
474 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
475 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
477 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
479 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
480 clear_cpu_cap(c, X86_FEATURE_VNMI);
481 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
482 clear_cpu_cap(c, X86_FEATURE_EPT);
483 clear_cpu_cap(c, X86_FEATURE_VPID);
485 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
486 msr_ctl = vmx_msr_high | vmx_msr_low;
487 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
488 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
489 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
490 set_cpu_cap(c, X86_FEATURE_VNMI);
491 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
492 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
493 vmx_msr_low, vmx_msr_high);
494 msr_ctl2 = vmx_msr_high | vmx_msr_low;
495 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
496 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
497 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
498 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
499 set_cpu_cap(c, X86_FEATURE_EPT);
500 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
501 set_cpu_cap(c, X86_FEATURE_VPID);
505 static void init_intel_energy_perf(struct cpuinfo_x86 *c)
510 * Initialize MSR_IA32_ENERGY_PERF_BIAS if not already initialized.
511 * (x86_energy_perf_policy(8) is available to change it at run-time.)
513 if (!cpu_has(c, X86_FEATURE_EPB))
516 rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
517 if ((epb & 0xF) != ENERGY_PERF_BIAS_PERFORMANCE)
520 pr_warn_once("ENERGY_PERF_BIAS: Set to 'normal', was 'performance'\n");
521 pr_warn_once("ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)\n");
522 epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
523 wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
526 static void intel_bsp_resume(struct cpuinfo_x86 *c)
529 * MSR_IA32_ENERGY_PERF_BIAS is lost across suspend/resume,
530 * so reinitialize it properly like during bootup:
532 init_intel_energy_perf(c);
535 static void init_cpuid_fault(struct cpuinfo_x86 *c)
539 if (!rdmsrl_safe(MSR_PLATFORM_INFO, &msr)) {
540 if (msr & MSR_PLATFORM_INFO_CPUID_FAULT)
541 set_cpu_cap(c, X86_FEATURE_CPUID_FAULT);
545 static void init_intel_misc_features(struct cpuinfo_x86 *c)
549 if (rdmsrl_safe(MSR_MISC_FEATURES_ENABLES, &msr))
552 /* Clear all MISC features */
553 this_cpu_write(msr_misc_features_shadow, 0);
555 /* Check features and update capabilities and shadow control bits */
557 probe_xeon_phi_r3mwait(c);
559 msr = this_cpu_read(msr_misc_features_shadow);
560 wrmsrl(MSR_MISC_FEATURES_ENABLES, msr);
563 static void init_intel(struct cpuinfo_x86 *c)
569 intel_workarounds(c);
572 * Detect the extended topology information if available. This
573 * will reinitialise the initial_apicid which will be used
574 * in init_intel_cacheinfo()
576 detect_extended_topology(c);
578 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
580 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
583 c->x86_max_cores = intel_num_cpu_cores(c);
589 l2 = init_intel_cacheinfo(c);
591 /* Detect legacy cache sizes if init_intel_cacheinfo did not */
593 cpu_detect_cache_sizes(c);
594 l2 = c->x86_cache_size;
597 if (c->cpuid_level > 9) {
598 unsigned eax = cpuid_eax(10);
599 /* Check for version and the number of counters */
600 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
601 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
604 if (cpu_has(c, X86_FEATURE_XMM2))
605 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
607 if (boot_cpu_has(X86_FEATURE_DS)) {
609 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
611 set_cpu_cap(c, X86_FEATURE_BTS);
613 set_cpu_cap(c, X86_FEATURE_PEBS);
616 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_CLFLUSH) &&
617 (c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47))
618 set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR);
620 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_MWAIT) &&
621 ((c->x86_model == INTEL_FAM6_ATOM_GOLDMONT)))
622 set_cpu_bug(c, X86_BUG_MONITOR);
626 c->x86_cache_alignment = c->x86_clflush_size * 2;
628 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
631 * Names for the Pentium II/Celeron processors
632 * detectable only by also checking the cache size.
633 * Dixon is NOT a Celeron.
638 switch (c->x86_model) {
641 p = "Celeron (Covington)";
643 p = "Mobile Pentium II (Dixon)";
648 p = "Celeron (Mendocino)";
649 else if (c->x86_mask == 0 || c->x86_mask == 5)
655 p = "Celeron (Coppermine)";
660 strcpy(c->x86_model_id, p);
664 set_cpu_cap(c, X86_FEATURE_P4);
666 set_cpu_cap(c, X86_FEATURE_P3);
669 /* Work around errata */
672 if (cpu_has(c, X86_FEATURE_VMX))
673 detect_vmx_virtcap(c);
675 init_intel_energy_perf(c);
677 init_intel_misc_features(c);
681 static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
684 * Intel PIII Tualatin. This comes in two flavours.
685 * One has 256kb of cache, the other 512. We have no way
686 * to determine which, so we use a boottime override
687 * for the 512kb model, and assume 256 otherwise.
689 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
693 * Intel Quark SoC X1000 contains a 4-way set associative
694 * 16K cache with a 16 byte cache line and 256 lines per tag
696 if ((c->x86 == 5) && (c->x86_model == 9))
702 #define TLB_INST_4K 0x01
703 #define TLB_INST_4M 0x02
704 #define TLB_INST_2M_4M 0x03
706 #define TLB_INST_ALL 0x05
707 #define TLB_INST_1G 0x06
709 #define TLB_DATA_4K 0x11
710 #define TLB_DATA_4M 0x12
711 #define TLB_DATA_2M_4M 0x13
712 #define TLB_DATA_4K_4M 0x14
714 #define TLB_DATA_1G 0x16
716 #define TLB_DATA0_4K 0x21
717 #define TLB_DATA0_4M 0x22
718 #define TLB_DATA0_2M_4M 0x23
721 #define STLB_4K_2M 0x42
723 static const struct _tlb_table intel_tlb_table[] = {
724 { 0x01, TLB_INST_4K, 32, " TLB_INST 4 KByte pages, 4-way set associative" },
725 { 0x02, TLB_INST_4M, 2, " TLB_INST 4 MByte pages, full associative" },
726 { 0x03, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way set associative" },
727 { 0x04, TLB_DATA_4M, 8, " TLB_DATA 4 MByte pages, 4-way set associative" },
728 { 0x05, TLB_DATA_4M, 32, " TLB_DATA 4 MByte pages, 4-way set associative" },
729 { 0x0b, TLB_INST_4M, 4, " TLB_INST 4 MByte pages, 4-way set associative" },
730 { 0x4f, TLB_INST_4K, 32, " TLB_INST 4 KByte pages */" },
731 { 0x50, TLB_INST_ALL, 64, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
732 { 0x51, TLB_INST_ALL, 128, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
733 { 0x52, TLB_INST_ALL, 256, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
734 { 0x55, TLB_INST_2M_4M, 7, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
735 { 0x56, TLB_DATA0_4M, 16, " TLB_DATA0 4 MByte pages, 4-way set associative" },
736 { 0x57, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, 4-way associative" },
737 { 0x59, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, fully associative" },
738 { 0x5a, TLB_DATA0_2M_4M, 32, " TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative" },
739 { 0x5b, TLB_DATA_4K_4M, 64, " TLB_DATA 4 KByte and 4 MByte pages" },
740 { 0x5c, TLB_DATA_4K_4M, 128, " TLB_DATA 4 KByte and 4 MByte pages" },
741 { 0x5d, TLB_DATA_4K_4M, 256, " TLB_DATA 4 KByte and 4 MByte pages" },
742 { 0x61, TLB_INST_4K, 48, " TLB_INST 4 KByte pages, full associative" },
743 { 0x63, TLB_DATA_1G, 4, " TLB_DATA 1 GByte pages, 4-way set associative" },
744 { 0x76, TLB_INST_2M_4M, 8, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
745 { 0xb0, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 4-way set associative" },
746 { 0xb1, TLB_INST_2M_4M, 4, " TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries" },
747 { 0xb2, TLB_INST_4K, 64, " TLB_INST 4KByte pages, 4-way set associative" },
748 { 0xb3, TLB_DATA_4K, 128, " TLB_DATA 4 KByte pages, 4-way set associative" },
749 { 0xb4, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 4-way associative" },
750 { 0xb5, TLB_INST_4K, 64, " TLB_INST 4 KByte pages, 8-way set associative" },
751 { 0xb6, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 8-way set associative" },
752 { 0xba, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way associative" },
753 { 0xc0, TLB_DATA_4K_4M, 8, " TLB_DATA 4 KByte and 4 MByte pages, 4-way associative" },
754 { 0xc1, STLB_4K_2M, 1024, " STLB 4 KByte and 2 MByte pages, 8-way associative" },
755 { 0xc2, TLB_DATA_2M_4M, 16, " DTLB 2 MByte/4MByte pages, 4-way associative" },
756 { 0xca, STLB_4K, 512, " STLB 4 KByte pages, 4-way associative" },
760 static void intel_tlb_lookup(const unsigned char desc)
766 /* look up this descriptor in the table */
767 for (k = 0; intel_tlb_table[k].descriptor != desc && \
768 intel_tlb_table[k].descriptor != 0; k++)
771 if (intel_tlb_table[k].tlb_type == 0)
774 switch (intel_tlb_table[k].tlb_type) {
776 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
777 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
778 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
779 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
782 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
783 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
784 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
785 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
786 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
787 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
788 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
789 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
790 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
791 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
792 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
793 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
796 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
797 tlb_lli_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_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
801 tlb_lli_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;
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_2m[ENTRIES] < intel_tlb_table[k].entries)
813 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
814 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
815 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
819 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
820 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
824 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
825 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
828 case TLB_DATA0_2M_4M:
829 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
830 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
831 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
832 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
835 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
836 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
837 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
838 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
841 if (tlb_lld_1g[ENTRIES] < intel_tlb_table[k].entries)
842 tlb_lld_1g[ENTRIES] = intel_tlb_table[k].entries;
847 static void intel_detect_tlb(struct cpuinfo_x86 *c)
850 unsigned int regs[4];
851 unsigned char *desc = (unsigned char *)regs;
853 if (c->cpuid_level < 2)
856 /* Number of times to iterate */
857 n = cpuid_eax(2) & 0xFF;
859 for (i = 0 ; i < n ; i++) {
860 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
862 /* If bit 31 is set, this is an unknown format */
863 for (j = 0 ; j < 3 ; j++)
864 if (regs[j] & (1 << 31))
867 /* Byte 0 is level count, not a descriptor */
868 for (j = 1 ; j < 16 ; j++)
869 intel_tlb_lookup(desc[j]);
873 static const struct cpu_dev intel_cpu_dev = {
875 .c_ident = { "GenuineIntel" },
878 { .family = 4, .model_names =
880 [0] = "486 DX-25/33",
891 { .family = 5, .model_names =
893 [0] = "Pentium 60/66 A-step",
894 [1] = "Pentium 60/66",
895 [2] = "Pentium 75 - 200",
896 [3] = "OverDrive PODP5V83",
898 [7] = "Mobile Pentium 75 - 200",
899 [8] = "Mobile Pentium MMX",
900 [9] = "Quark SoC X1000",
903 { .family = 6, .model_names =
905 [0] = "Pentium Pro A-step",
907 [3] = "Pentium II (Klamath)",
908 [4] = "Pentium II (Deschutes)",
909 [5] = "Pentium II (Deschutes)",
910 [6] = "Mobile Pentium II",
911 [7] = "Pentium III (Katmai)",
912 [8] = "Pentium III (Coppermine)",
913 [10] = "Pentium III (Cascades)",
914 [11] = "Pentium III (Tualatin)",
917 { .family = 15, .model_names =
919 [0] = "Pentium 4 (Unknown)",
920 [1] = "Pentium 4 (Willamette)",
921 [2] = "Pentium 4 (Northwood)",
922 [4] = "Pentium 4 (Foster)",
923 [5] = "Pentium 4 (Foster)",
927 .legacy_cache_size = intel_size_cache,
929 .c_detect_tlb = intel_detect_tlb,
930 .c_early_init = early_init_intel,
931 .c_init = init_intel,
932 .c_bsp_resume = intel_bsp_resume,
933 .c_x86_vendor = X86_VENDOR_INTEL,
936 cpu_dev_register(intel_cpu_dev);