1 #include <linux/kernel.h>
3 #include <linux/string.h>
4 #include <linux/bitops.h>
6 #include <linux/sched.h>
7 #include <linux/thread_info.h>
8 #include <linux/init.h>
9 #include <linux/uaccess.h>
11 #include <asm/cpufeature.h>
12 #include <asm/pgtable.h>
16 #include <asm/intel-family.h>
17 #include <asm/microcode_intel.h>
20 #include <linux/topology.h>
25 #ifdef CONFIG_X86_LOCAL_APIC
26 #include <asm/mpspec.h>
31 * Just in case our CPU detection goes bad, or you have a weird system,
32 * allow a way to override the automatic disabling of MPX.
36 static int __init forcempx_setup(char *__unused)
42 __setup("intel-skd-046-workaround=disable", forcempx_setup);
44 void check_mpx_erratum(struct cpuinfo_x86 *c)
49 * Turn off the MPX feature on CPUs where SMEP is not
50 * available or disabled.
52 * Works around Intel Erratum SKD046: "Branch Instructions
53 * May Initialize MPX Bound Registers Incorrectly".
55 * This might falsely disable MPX on systems without
56 * SMEP, like Atom processors without SMEP. But there
57 * is no such hardware known at the moment.
59 if (cpu_has(c, X86_FEATURE_MPX) && !cpu_has(c, X86_FEATURE_SMEP)) {
60 setup_clear_cpu_cap(X86_FEATURE_MPX);
61 pr_warn("x86/mpx: Disabling MPX since SMEP not present\n");
66 * Early microcode releases for the Spectre v2 mitigation were broken.
67 * Information taken from;
68 * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/03/microcode-update-guidance.pdf
69 * - https://kb.vmware.com/s/article/52345
70 * - Microcode revisions observed in the wild
71 * - Release note from 20180108 microcode release
73 struct sku_microcode {
78 static const struct sku_microcode spectre_bad_microcodes[] = {
79 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0B, 0x80 },
80 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0A, 0x80 },
81 { INTEL_FAM6_KABYLAKE_DESKTOP, 0x09, 0x80 },
82 { INTEL_FAM6_KABYLAKE_MOBILE, 0x0A, 0x80 },
83 { INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x80 },
84 { INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e },
85 { INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003c },
86 { INTEL_FAM6_BROADWELL_CORE, 0x04, 0x28 },
87 { INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x1b },
88 { INTEL_FAM6_BROADWELL_XEON_D, 0x02, 0x14 },
89 { INTEL_FAM6_BROADWELL_XEON_D, 0x03, 0x07000011 },
90 { INTEL_FAM6_BROADWELL_X, 0x01, 0x0b000025 },
91 { INTEL_FAM6_HASWELL_ULT, 0x01, 0x21 },
92 { INTEL_FAM6_HASWELL_GT3E, 0x01, 0x18 },
93 { INTEL_FAM6_HASWELL_CORE, 0x03, 0x23 },
94 { INTEL_FAM6_HASWELL_X, 0x02, 0x3b },
95 { INTEL_FAM6_HASWELL_X, 0x04, 0x10 },
96 { INTEL_FAM6_IVYBRIDGE_X, 0x04, 0x42a },
97 /* Observed in the wild */
98 { INTEL_FAM6_SANDYBRIDGE_X, 0x06, 0x61b },
99 { INTEL_FAM6_SANDYBRIDGE_X, 0x07, 0x712 },
102 static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
107 * We know that the hypervisor lie to us on the microcode version so
108 * we may as well hope that it is running the correct version.
110 if (cpu_has(c, X86_FEATURE_HYPERVISOR))
116 for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
117 if (c->x86_model == spectre_bad_microcodes[i].model &&
118 c->x86_stepping == spectre_bad_microcodes[i].stepping)
119 return (c->microcode <= spectre_bad_microcodes[i].microcode);
124 static void early_init_intel(struct cpuinfo_x86 *c)
128 /* Unmask CPUID levels if masked: */
129 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
130 if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
131 MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) {
132 c->cpuid_level = cpuid_eax(0);
137 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
138 (c->x86 == 0x6 && c->x86_model >= 0x0e))
139 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
141 if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64))
142 c->microcode = intel_get_microcode_revision();
144 /* Now if any of them are set, check the blacklist and clear the lot */
145 if ((cpu_has(c, X86_FEATURE_SPEC_CTRL) ||
146 cpu_has(c, X86_FEATURE_INTEL_STIBP) ||
147 cpu_has(c, X86_FEATURE_IBRS) || cpu_has(c, X86_FEATURE_IBPB) ||
148 cpu_has(c, X86_FEATURE_STIBP)) && bad_spectre_microcode(c)) {
149 pr_warn("Intel Spectre v2 broken microcode detected; disabling Speculation Control\n");
150 setup_clear_cpu_cap(X86_FEATURE_IBRS);
151 setup_clear_cpu_cap(X86_FEATURE_IBPB);
152 setup_clear_cpu_cap(X86_FEATURE_STIBP);
153 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL);
154 setup_clear_cpu_cap(X86_FEATURE_MSR_SPEC_CTRL);
155 setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP);
156 setup_clear_cpu_cap(X86_FEATURE_SSBD);
157 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL_SSBD);
161 * Atom erratum AAE44/AAF40/AAG38/AAH41:
163 * A race condition between speculative fetches and invalidating
164 * a large page. This is worked around in microcode, but we
165 * need the microcode to have already been loaded... so if it is
166 * not, recommend a BIOS update and disable large pages.
168 if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_stepping <= 2 &&
169 c->microcode < 0x20e) {
170 pr_warn("Atom PSE erratum detected, BIOS microcode update recommended\n");
171 clear_cpu_cap(c, X86_FEATURE_PSE);
175 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
177 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
178 if (c->x86 == 15 && c->x86_cache_alignment == 64)
179 c->x86_cache_alignment = 128;
182 /* CPUID workaround for 0F33/0F34 CPU */
183 if (c->x86 == 0xF && c->x86_model == 0x3
184 && (c->x86_stepping == 0x3 || c->x86_stepping == 0x4))
185 c->x86_phys_bits = 36;
188 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
189 * with P/T states and does not stop in deep C-states.
191 * It is also reliable across cores and sockets. (but not across
192 * cabinets - we turn it off in that case explicitly.)
194 if (c->x86_power & (1 << 8)) {
195 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
196 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
197 if (!check_tsc_unstable())
198 set_sched_clock_stable();
201 /* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
203 switch (c->x86_model) {
204 case 0x27: /* Penwell */
205 case 0x35: /* Cloverview */
206 case 0x4a: /* Merrifield */
207 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
215 * There is a known erratum on Pentium III and Core Solo
217 * " Page with PAT set to WC while associated MTRR is UC
218 * may consolidate to UC "
219 * Because of this erratum, it is better to stick with
220 * setting WC in MTRR rather than using PAT on these CPUs.
222 * Enable PAT WC only on P4, Core 2 or later CPUs.
224 if (c->x86 == 6 && c->x86_model < 15)
225 clear_cpu_cap(c, X86_FEATURE_PAT);
227 #ifdef CONFIG_KMEMCHECK
229 * P4s have a "fast strings" feature which causes single-
230 * stepping REP instructions to only generate a #DB on
231 * cache-line boundaries.
233 * Ingo Molnar reported a Pentium D (model 6) and a Xeon
234 * (model 2) with the same problem.
237 if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
238 MSR_IA32_MISC_ENABLE_FAST_STRING_BIT) > 0)
239 pr_info("kmemcheck: Disabling fast string operations\n");
243 * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
244 * clear the fast string and enhanced fast string CPU capabilities.
246 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
247 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
248 if (!(misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING)) {
249 pr_info("Disabled fast string operations\n");
250 setup_clear_cpu_cap(X86_FEATURE_REP_GOOD);
251 setup_clear_cpu_cap(X86_FEATURE_ERMS);
256 * Intel Quark Core DevMan_001.pdf section 6.4.11
257 * "The operating system also is required to invalidate (i.e., flush)
258 * the TLB when any changes are made to any of the page table entries.
259 * The operating system must reload CR3 to cause the TLB to be flushed"
261 * As a result, boot_cpu_has(X86_FEATURE_PGE) in arch/x86/include/asm/tlbflush.h
262 * should be false so that __flush_tlb_all() causes CR3 insted of CR4.PGE
265 if (c->x86 == 5 && c->x86_model == 9) {
266 pr_info("Disabling PGE capability bit\n");
267 setup_clear_cpu_cap(X86_FEATURE_PGE);
270 if (c->cpuid_level >= 0x00000001) {
271 u32 eax, ebx, ecx, edx;
273 cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
275 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
276 * apicids which are reserved per package. Store the resulting
277 * shift value for the package management code.
279 if (edx & (1U << 28))
280 c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
283 check_mpx_erratum(c);
286 * Get the number of SMT siblings early from the extended topology
287 * leaf, if available. Otherwise try the legacy SMT detection.
289 if (detect_extended_topology_early(c) < 0)
295 * Early probe support logic for ppro memory erratum #50
297 * This is called before we do cpu ident work
300 int ppro_with_ram_bug(void)
302 /* Uses data from early_cpu_detect now */
303 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
304 boot_cpu_data.x86 == 6 &&
305 boot_cpu_data.x86_model == 1 &&
306 boot_cpu_data.x86_stepping < 8) {
307 pr_info("Pentium Pro with Errata#50 detected. Taking evasive action.\n");
313 static void intel_smp_check(struct cpuinfo_x86 *c)
315 /* calling is from identify_secondary_cpu() ? */
320 * Mask B, Pentium, but not Pentium MMX
323 c->x86_stepping >= 1 && c->x86_stepping <= 4 &&
326 * Remember we have B step Pentia with bugs
328 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
329 "with B stepping processors.\n");
334 static int __init forcepae_setup(char *__unused)
339 __setup("forcepae", forcepae_setup);
341 static void intel_workarounds(struct cpuinfo_x86 *c)
343 #ifdef CONFIG_X86_F00F_BUG
345 * All models of Pentium and Pentium with MMX technology CPUs
346 * have the F0 0F bug, which lets nonprivileged users lock up the
347 * system. Announce that the fault handler will be checking for it.
348 * The Quark is also family 5, but does not have the same bug.
350 clear_cpu_bug(c, X86_BUG_F00F);
351 if (c->x86 == 5 && c->x86_model < 9) {
352 static int f00f_workaround_enabled;
354 set_cpu_bug(c, X86_BUG_F00F);
355 if (!f00f_workaround_enabled) {
356 pr_notice("Intel Pentium with F0 0F bug - workaround enabled.\n");
357 f00f_workaround_enabled = 1;
363 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
366 if ((c->x86<<8 | c->x86_model<<4 | c->x86_stepping) < 0x633)
367 clear_cpu_cap(c, X86_FEATURE_SEP);
370 * PAE CPUID issue: many Pentium M report no PAE but may have a
371 * functionally usable PAE implementation.
372 * Forcefully enable PAE if kernel parameter "forcepae" is present.
375 pr_warn("PAE forced!\n");
376 set_cpu_cap(c, X86_FEATURE_PAE);
377 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
381 * P4 Xeon erratum 037 workaround.
382 * Hardware prefetcher may cause stale data to be loaded into the cache.
384 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_stepping == 1)) {
385 if (msr_set_bit(MSR_IA32_MISC_ENABLE,
386 MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE_BIT) > 0) {
387 pr_info("CPU: C0 stepping P4 Xeon detected.\n");
388 pr_info("CPU: Disabling hardware prefetching (Erratum 037)\n");
393 * See if we have a good local APIC by checking for buggy Pentia,
394 * i.e. all B steppings and the C2 stepping of P54C when using their
395 * integrated APIC (see 11AP erratum in "Pentium Processor
396 * Specification Update").
398 if (boot_cpu_has(X86_FEATURE_APIC) && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
399 (c->x86_stepping < 0x6 || c->x86_stepping == 0xb))
400 set_cpu_bug(c, X86_BUG_11AP);
403 #ifdef CONFIG_X86_INTEL_USERCOPY
405 * Set up the preferred alignment for movsl bulk memory moves
408 case 4: /* 486: untested */
410 case 5: /* Old Pentia: untested */
412 case 6: /* PII/PIII only like movsl with 8-byte alignment */
415 case 15: /* P4 is OK down to 8-byte alignment */
424 static void intel_workarounds(struct cpuinfo_x86 *c)
429 static void srat_detect_node(struct cpuinfo_x86 *c)
433 int cpu = smp_processor_id();
435 /* Don't do the funky fallback heuristics the AMD version employs
437 node = numa_cpu_node(cpu);
438 if (node == NUMA_NO_NODE || !node_online(node)) {
439 /* reuse the value from init_cpu_to_node() */
440 node = cpu_to_node(cpu);
442 numa_set_node(cpu, node);
447 * find out the number of processor cores on the die
449 static int intel_num_cpu_cores(struct cpuinfo_x86 *c)
451 unsigned int eax, ebx, ecx, edx;
453 if (!IS_ENABLED(CONFIG_SMP) || c->cpuid_level < 4)
456 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
457 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
459 return (eax >> 26) + 1;
464 static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
466 /* Intel VMX MSR indicated features */
467 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
468 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
469 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
470 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
471 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
472 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
474 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
476 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
477 clear_cpu_cap(c, X86_FEATURE_VNMI);
478 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
479 clear_cpu_cap(c, X86_FEATURE_EPT);
480 clear_cpu_cap(c, X86_FEATURE_VPID);
482 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
483 msr_ctl = vmx_msr_high | vmx_msr_low;
484 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
485 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
486 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
487 set_cpu_cap(c, X86_FEATURE_VNMI);
488 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
489 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
490 vmx_msr_low, vmx_msr_high);
491 msr_ctl2 = vmx_msr_high | vmx_msr_low;
492 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
493 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
494 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
495 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
496 set_cpu_cap(c, X86_FEATURE_EPT);
497 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
498 set_cpu_cap(c, X86_FEATURE_VPID);
502 static void init_intel_energy_perf(struct cpuinfo_x86 *c)
507 * Initialize MSR_IA32_ENERGY_PERF_BIAS if not already initialized.
508 * (x86_energy_perf_policy(8) is available to change it at run-time.)
510 if (!cpu_has(c, X86_FEATURE_EPB))
513 rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
514 if ((epb & 0xF) != ENERGY_PERF_BIAS_PERFORMANCE)
517 pr_warn_once("ENERGY_PERF_BIAS: Set to 'normal', was 'performance'\n");
518 pr_warn_once("ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)\n");
519 epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
520 wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
523 static void intel_bsp_resume(struct cpuinfo_x86 *c)
526 * MSR_IA32_ENERGY_PERF_BIAS is lost across suspend/resume,
527 * so reinitialize it properly like during bootup:
529 init_intel_energy_perf(c);
532 static void init_intel(struct cpuinfo_x86 *c)
538 intel_workarounds(c);
541 * Detect the extended topology information if available. This
542 * will reinitialise the initial_apicid which will be used
543 * in init_intel_cacheinfo()
545 detect_extended_topology(c);
547 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
549 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
552 c->x86_max_cores = intel_num_cpu_cores(c);
558 l2 = init_intel_cacheinfo(c);
560 /* Detect legacy cache sizes if init_intel_cacheinfo did not */
562 cpu_detect_cache_sizes(c);
563 l2 = c->x86_cache_size;
566 if (c->cpuid_level > 9) {
567 unsigned eax = cpuid_eax(10);
568 /* Check for version and the number of counters */
569 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
570 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
573 if (cpu_has(c, X86_FEATURE_XMM2))
574 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
576 if (boot_cpu_has(X86_FEATURE_DS)) {
578 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
580 set_cpu_cap(c, X86_FEATURE_BTS);
582 set_cpu_cap(c, X86_FEATURE_PEBS);
585 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_CLFLUSH) &&
586 (c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47))
587 set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR);
589 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_MWAIT) &&
590 ((c->x86_model == INTEL_FAM6_ATOM_GOLDMONT)))
591 set_cpu_bug(c, X86_BUG_MONITOR);
595 c->x86_cache_alignment = c->x86_clflush_size * 2;
597 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
600 * Names for the Pentium II/Celeron processors
601 * detectable only by also checking the cache size.
602 * Dixon is NOT a Celeron.
607 switch (c->x86_model) {
610 p = "Celeron (Covington)";
612 p = "Mobile Pentium II (Dixon)";
617 p = "Celeron (Mendocino)";
618 else if (c->x86_stepping == 0 || c->x86_stepping == 5)
624 p = "Celeron (Coppermine)";
629 strcpy(c->x86_model_id, p);
633 set_cpu_cap(c, X86_FEATURE_P4);
635 set_cpu_cap(c, X86_FEATURE_P3);
638 /* Work around errata */
641 if (cpu_has(c, X86_FEATURE_VMX))
642 detect_vmx_virtcap(c);
644 init_intel_energy_perf(c);
646 if (tsx_ctrl_state == TSX_CTRL_ENABLE)
648 if (tsx_ctrl_state == TSX_CTRL_DISABLE)
653 static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
656 * Intel PIII Tualatin. This comes in two flavours.
657 * One has 256kb of cache, the other 512. We have no way
658 * to determine which, so we use a boottime override
659 * for the 512kb model, and assume 256 otherwise.
661 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
665 * Intel Quark SoC X1000 contains a 4-way set associative
666 * 16K cache with a 16 byte cache line and 256 lines per tag
668 if ((c->x86 == 5) && (c->x86_model == 9))
674 #define TLB_INST_4K 0x01
675 #define TLB_INST_4M 0x02
676 #define TLB_INST_2M_4M 0x03
678 #define TLB_INST_ALL 0x05
679 #define TLB_INST_1G 0x06
681 #define TLB_DATA_4K 0x11
682 #define TLB_DATA_4M 0x12
683 #define TLB_DATA_2M_4M 0x13
684 #define TLB_DATA_4K_4M 0x14
686 #define TLB_DATA_1G 0x16
688 #define TLB_DATA0_4K 0x21
689 #define TLB_DATA0_4M 0x22
690 #define TLB_DATA0_2M_4M 0x23
693 #define STLB_4K_2M 0x42
695 static const struct _tlb_table intel_tlb_table[] = {
696 { 0x01, TLB_INST_4K, 32, " TLB_INST 4 KByte pages, 4-way set associative" },
697 { 0x02, TLB_INST_4M, 2, " TLB_INST 4 MByte pages, full associative" },
698 { 0x03, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way set associative" },
699 { 0x04, TLB_DATA_4M, 8, " TLB_DATA 4 MByte pages, 4-way set associative" },
700 { 0x05, TLB_DATA_4M, 32, " TLB_DATA 4 MByte pages, 4-way set associative" },
701 { 0x0b, TLB_INST_4M, 4, " TLB_INST 4 MByte pages, 4-way set associative" },
702 { 0x4f, TLB_INST_4K, 32, " TLB_INST 4 KByte pages */" },
703 { 0x50, TLB_INST_ALL, 64, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
704 { 0x51, TLB_INST_ALL, 128, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
705 { 0x52, TLB_INST_ALL, 256, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
706 { 0x55, TLB_INST_2M_4M, 7, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
707 { 0x56, TLB_DATA0_4M, 16, " TLB_DATA0 4 MByte pages, 4-way set associative" },
708 { 0x57, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, 4-way associative" },
709 { 0x59, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, fully associative" },
710 { 0x5a, TLB_DATA0_2M_4M, 32, " TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative" },
711 { 0x5b, TLB_DATA_4K_4M, 64, " TLB_DATA 4 KByte and 4 MByte pages" },
712 { 0x5c, TLB_DATA_4K_4M, 128, " TLB_DATA 4 KByte and 4 MByte pages" },
713 { 0x5d, TLB_DATA_4K_4M, 256, " TLB_DATA 4 KByte and 4 MByte pages" },
714 { 0x61, TLB_INST_4K, 48, " TLB_INST 4 KByte pages, full associative" },
715 { 0x63, TLB_DATA_1G, 4, " TLB_DATA 1 GByte pages, 4-way set associative" },
716 { 0x76, TLB_INST_2M_4M, 8, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
717 { 0xb0, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 4-way set associative" },
718 { 0xb1, TLB_INST_2M_4M, 4, " TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries" },
719 { 0xb2, TLB_INST_4K, 64, " TLB_INST 4KByte pages, 4-way set associative" },
720 { 0xb3, TLB_DATA_4K, 128, " TLB_DATA 4 KByte pages, 4-way set associative" },
721 { 0xb4, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 4-way associative" },
722 { 0xb5, TLB_INST_4K, 64, " TLB_INST 4 KByte pages, 8-way set associative" },
723 { 0xb6, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 8-way set associative" },
724 { 0xba, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way associative" },
725 { 0xc0, TLB_DATA_4K_4M, 8, " TLB_DATA 4 KByte and 4 MByte pages, 4-way associative" },
726 { 0xc1, STLB_4K_2M, 1024, " STLB 4 KByte and 2 MByte pages, 8-way associative" },
727 { 0xc2, TLB_DATA_2M_4M, 16, " DTLB 2 MByte/4MByte pages, 4-way associative" },
728 { 0xca, STLB_4K, 512, " STLB 4 KByte pages, 4-way associative" },
732 static void intel_tlb_lookup(const unsigned char desc)
738 /* look up this descriptor in the table */
739 for (k = 0; intel_tlb_table[k].descriptor != desc && \
740 intel_tlb_table[k].descriptor != 0; k++)
743 if (intel_tlb_table[k].tlb_type == 0)
746 switch (intel_tlb_table[k].tlb_type) {
748 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
749 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
750 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
751 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
754 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
755 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
756 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
757 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
758 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
759 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
760 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
761 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
762 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
763 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
764 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
765 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
768 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
769 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
770 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
771 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
772 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
773 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
776 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
777 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
780 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
781 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
784 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
785 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
786 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
787 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
791 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
792 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
796 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
797 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
800 case TLB_DATA0_2M_4M:
801 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
802 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
803 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
804 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
807 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
808 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
809 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
810 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
813 if (tlb_lld_1g[ENTRIES] < intel_tlb_table[k].entries)
814 tlb_lld_1g[ENTRIES] = intel_tlb_table[k].entries;
819 static void intel_detect_tlb(struct cpuinfo_x86 *c)
822 unsigned int regs[4];
823 unsigned char *desc = (unsigned char *)regs;
825 if (c->cpuid_level < 2)
828 /* Number of times to iterate */
829 n = cpuid_eax(2) & 0xFF;
831 for (i = 0 ; i < n ; i++) {
832 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
834 /* If bit 31 is set, this is an unknown format */
835 for (j = 0 ; j < 3 ; j++)
836 if (regs[j] & (1 << 31))
839 /* Byte 0 is level count, not a descriptor */
840 for (j = 1 ; j < 16 ; j++)
841 intel_tlb_lookup(desc[j]);
845 static const struct cpu_dev intel_cpu_dev = {
847 .c_ident = { "GenuineIntel" },
850 { .family = 4, .model_names =
852 [0] = "486 DX-25/33",
863 { .family = 5, .model_names =
865 [0] = "Pentium 60/66 A-step",
866 [1] = "Pentium 60/66",
867 [2] = "Pentium 75 - 200",
868 [3] = "OverDrive PODP5V83",
870 [7] = "Mobile Pentium 75 - 200",
871 [8] = "Mobile Pentium MMX",
872 [9] = "Quark SoC X1000",
875 { .family = 6, .model_names =
877 [0] = "Pentium Pro A-step",
879 [3] = "Pentium II (Klamath)",
880 [4] = "Pentium II (Deschutes)",
881 [5] = "Pentium II (Deschutes)",
882 [6] = "Mobile Pentium II",
883 [7] = "Pentium III (Katmai)",
884 [8] = "Pentium III (Coppermine)",
885 [10] = "Pentium III (Cascades)",
886 [11] = "Pentium III (Tualatin)",
889 { .family = 15, .model_names =
891 [0] = "Pentium 4 (Unknown)",
892 [1] = "Pentium 4 (Willamette)",
893 [2] = "Pentium 4 (Northwood)",
894 [4] = "Pentium 4 (Foster)",
895 [5] = "Pentium 4 (Foster)",
899 .legacy_cache_size = intel_size_cache,
901 .c_detect_tlb = intel_detect_tlb,
902 .c_early_init = early_init_intel,
903 .c_init = init_intel,
904 .c_bsp_resume = intel_bsp_resume,
905 .c_x86_vendor = X86_VENDOR_INTEL,
908 cpu_dev_register(intel_cpu_dev);