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_SKYLAKE_MOBILE, 0x03, 0xc2 },
127 { INTEL_FAM6_SKYLAKE_DESKTOP, 0x03, 0xc2 },
128 { INTEL_FAM6_BROADWELL_CORE, 0x04, 0x28 },
129 { INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x1b },
130 { INTEL_FAM6_BROADWELL_XEON_D, 0x02, 0x14 },
131 { INTEL_FAM6_BROADWELL_XEON_D, 0x03, 0x07000011 },
132 { INTEL_FAM6_BROADWELL_X, 0x01, 0x0b000025 },
133 { INTEL_FAM6_HASWELL_ULT, 0x01, 0x21 },
134 { INTEL_FAM6_HASWELL_GT3E, 0x01, 0x18 },
135 { INTEL_FAM6_HASWELL_CORE, 0x03, 0x23 },
136 { INTEL_FAM6_HASWELL_X, 0x02, 0x3b },
137 { INTEL_FAM6_HASWELL_X, 0x04, 0x10 },
138 { INTEL_FAM6_IVYBRIDGE_X, 0x04, 0x42a },
139 /* Updated in the 20180108 release; blacklist until we know otherwise */
140 { INTEL_FAM6_ATOM_GEMINI_LAKE, 0x01, 0x22 },
141 /* Observed in the wild */
142 { INTEL_FAM6_SANDYBRIDGE_X, 0x06, 0x61b },
143 { INTEL_FAM6_SANDYBRIDGE_X, 0x07, 0x712 },
146 static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
150 for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
151 if (c->x86_model == spectre_bad_microcodes[i].model &&
152 c->x86_mask == spectre_bad_microcodes[i].stepping)
153 return (c->microcode <= spectre_bad_microcodes[i].microcode);
158 static void early_init_intel(struct cpuinfo_x86 *c)
162 /* Unmask CPUID levels if masked: */
163 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
164 if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
165 MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) {
166 c->cpuid_level = cpuid_eax(0);
171 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
172 (c->x86 == 0x6 && c->x86_model >= 0x0e))
173 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
175 if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64))
176 c->microcode = intel_get_microcode_revision();
178 /* Now if any of them are set, check the blacklist and clear the lot */
179 if ((cpu_has(c, X86_FEATURE_SPEC_CTRL) ||
180 cpu_has(c, X86_FEATURE_INTEL_STIBP) ||
181 cpu_has(c, X86_FEATURE_IBRS) || cpu_has(c, X86_FEATURE_IBPB) ||
182 cpu_has(c, X86_FEATURE_STIBP)) && bad_spectre_microcode(c)) {
183 pr_warn("Intel Spectre v2 broken microcode detected; disabling Speculation Control\n");
184 setup_clear_cpu_cap(X86_FEATURE_IBRS);
185 setup_clear_cpu_cap(X86_FEATURE_IBPB);
186 setup_clear_cpu_cap(X86_FEATURE_STIBP);
187 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL);
188 setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP);
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_mask <= 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_mask == 0x3 || c->x86_mask == 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 0x27: /* Penwell */
234 case 0x35: /* Cloverview */
235 case 0x4a: /* Merrifield */
236 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
244 * There is a known erratum on Pentium III and Core Solo
246 * " Page with PAT set to WC while associated MTRR is UC
247 * may consolidate to UC "
248 * Because of this erratum, it is better to stick with
249 * setting WC in MTRR rather than using PAT on these CPUs.
251 * Enable PAT WC only on P4, Core 2 or later CPUs.
253 if (c->x86 == 6 && c->x86_model < 15)
254 clear_cpu_cap(c, X86_FEATURE_PAT);
257 * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
258 * clear the fast string and enhanced fast string CPU capabilities.
260 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
261 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
262 if (!(misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING)) {
263 pr_info("Disabled fast string operations\n");
264 setup_clear_cpu_cap(X86_FEATURE_REP_GOOD);
265 setup_clear_cpu_cap(X86_FEATURE_ERMS);
270 * Intel Quark Core DevMan_001.pdf section 6.4.11
271 * "The operating system also is required to invalidate (i.e., flush)
272 * the TLB when any changes are made to any of the page table entries.
273 * The operating system must reload CR3 to cause the TLB to be flushed"
275 * As a result, boot_cpu_has(X86_FEATURE_PGE) in arch/x86/include/asm/tlbflush.h
276 * should be false so that __flush_tlb_all() causes CR3 insted of CR4.PGE
279 if (c->x86 == 5 && c->x86_model == 9) {
280 pr_info("Disabling PGE capability bit\n");
281 setup_clear_cpu_cap(X86_FEATURE_PGE);
284 if (c->cpuid_level >= 0x00000001) {
285 u32 eax, ebx, ecx, edx;
287 cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
289 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
290 * apicids which are reserved per package. Store the resulting
291 * shift value for the package management code.
293 if (edx & (1U << 28))
294 c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
297 check_mpx_erratum(c);
302 * Early probe support logic for ppro memory erratum #50
304 * This is called before we do cpu ident work
307 int ppro_with_ram_bug(void)
309 /* Uses data from early_cpu_detect now */
310 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
311 boot_cpu_data.x86 == 6 &&
312 boot_cpu_data.x86_model == 1 &&
313 boot_cpu_data.x86_mask < 8) {
314 pr_info("Pentium Pro with Errata#50 detected. Taking evasive action.\n");
320 static void intel_smp_check(struct cpuinfo_x86 *c)
322 /* calling is from identify_secondary_cpu() ? */
327 * Mask B, Pentium, but not Pentium MMX
330 c->x86_mask >= 1 && c->x86_mask <= 4 &&
333 * Remember we have B step Pentia with bugs
335 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
336 "with B stepping processors.\n");
341 static int __init forcepae_setup(char *__unused)
346 __setup("forcepae", forcepae_setup);
348 static void intel_workarounds(struct cpuinfo_x86 *c)
350 #ifdef CONFIG_X86_F00F_BUG
352 * All models of Pentium and Pentium with MMX technology CPUs
353 * have the F0 0F bug, which lets nonprivileged users lock up the
354 * system. Announce that the fault handler will be checking for it.
355 * The Quark is also family 5, but does not have the same bug.
357 clear_cpu_bug(c, X86_BUG_F00F);
358 if (c->x86 == 5 && c->x86_model < 9) {
359 static int f00f_workaround_enabled;
361 set_cpu_bug(c, X86_BUG_F00F);
362 if (!f00f_workaround_enabled) {
363 pr_notice("Intel Pentium with F0 0F bug - workaround enabled.\n");
364 f00f_workaround_enabled = 1;
370 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
373 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
374 clear_cpu_cap(c, X86_FEATURE_SEP);
377 * PAE CPUID issue: many Pentium M report no PAE but may have a
378 * functionally usable PAE implementation.
379 * Forcefully enable PAE if kernel parameter "forcepae" is present.
382 pr_warn("PAE forced!\n");
383 set_cpu_cap(c, X86_FEATURE_PAE);
384 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
388 * P4 Xeon erratum 037 workaround.
389 * Hardware prefetcher may cause stale data to be loaded into the cache.
391 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
392 if (msr_set_bit(MSR_IA32_MISC_ENABLE,
393 MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE_BIT) > 0) {
394 pr_info("CPU: C0 stepping P4 Xeon detected.\n");
395 pr_info("CPU: Disabling hardware prefetching (Erratum 037)\n");
400 * See if we have a good local APIC by checking for buggy Pentia,
401 * i.e. all B steppings and the C2 stepping of P54C when using their
402 * integrated APIC (see 11AP erratum in "Pentium Processor
403 * Specification Update").
405 if (boot_cpu_has(X86_FEATURE_APIC) && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
406 (c->x86_mask < 0x6 || c->x86_mask == 0xb))
407 set_cpu_bug(c, X86_BUG_11AP);
410 #ifdef CONFIG_X86_INTEL_USERCOPY
412 * Set up the preferred alignment for movsl bulk memory moves
415 case 4: /* 486: untested */
417 case 5: /* Old Pentia: untested */
419 case 6: /* PII/PIII only like movsl with 8-byte alignment */
422 case 15: /* P4 is OK down to 8-byte alignment */
431 static void intel_workarounds(struct cpuinfo_x86 *c)
436 static void srat_detect_node(struct cpuinfo_x86 *c)
440 int cpu = smp_processor_id();
442 /* Don't do the funky fallback heuristics the AMD version employs
444 node = numa_cpu_node(cpu);
445 if (node == NUMA_NO_NODE || !node_online(node)) {
446 /* reuse the value from init_cpu_to_node() */
447 node = cpu_to_node(cpu);
449 numa_set_node(cpu, node);
454 * find out the number of processor cores on the die
456 static int intel_num_cpu_cores(struct cpuinfo_x86 *c)
458 unsigned int eax, ebx, ecx, edx;
460 if (!IS_ENABLED(CONFIG_SMP) || c->cpuid_level < 4)
463 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
464 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
466 return (eax >> 26) + 1;
471 static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
473 /* Intel VMX MSR indicated features */
474 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
475 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
476 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
477 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
478 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
479 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
481 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
483 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
484 clear_cpu_cap(c, X86_FEATURE_VNMI);
485 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
486 clear_cpu_cap(c, X86_FEATURE_EPT);
487 clear_cpu_cap(c, X86_FEATURE_VPID);
489 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
490 msr_ctl = vmx_msr_high | vmx_msr_low;
491 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
492 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
493 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
494 set_cpu_cap(c, X86_FEATURE_VNMI);
495 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
496 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
497 vmx_msr_low, vmx_msr_high);
498 msr_ctl2 = vmx_msr_high | vmx_msr_low;
499 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
500 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
501 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
502 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
503 set_cpu_cap(c, X86_FEATURE_EPT);
504 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
505 set_cpu_cap(c, X86_FEATURE_VPID);
509 static void init_intel_energy_perf(struct cpuinfo_x86 *c)
514 * Initialize MSR_IA32_ENERGY_PERF_BIAS if not already initialized.
515 * (x86_energy_perf_policy(8) is available to change it at run-time.)
517 if (!cpu_has(c, X86_FEATURE_EPB))
520 rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
521 if ((epb & 0xF) != ENERGY_PERF_BIAS_PERFORMANCE)
524 pr_warn_once("ENERGY_PERF_BIAS: Set to 'normal', was 'performance'\n");
525 pr_warn_once("ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)\n");
526 epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
527 wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
530 static void intel_bsp_resume(struct cpuinfo_x86 *c)
533 * MSR_IA32_ENERGY_PERF_BIAS is lost across suspend/resume,
534 * so reinitialize it properly like during bootup:
536 init_intel_energy_perf(c);
539 static void init_cpuid_fault(struct cpuinfo_x86 *c)
543 if (!rdmsrl_safe(MSR_PLATFORM_INFO, &msr)) {
544 if (msr & MSR_PLATFORM_INFO_CPUID_FAULT)
545 set_cpu_cap(c, X86_FEATURE_CPUID_FAULT);
549 static void init_intel_misc_features(struct cpuinfo_x86 *c)
553 if (rdmsrl_safe(MSR_MISC_FEATURES_ENABLES, &msr))
556 /* Clear all MISC features */
557 this_cpu_write(msr_misc_features_shadow, 0);
559 /* Check features and update capabilities and shadow control bits */
561 probe_xeon_phi_r3mwait(c);
563 msr = this_cpu_read(msr_misc_features_shadow);
564 wrmsrl(MSR_MISC_FEATURES_ENABLES, msr);
567 static void init_intel(struct cpuinfo_x86 *c)
573 intel_workarounds(c);
576 * Detect the extended topology information if available. This
577 * will reinitialise the initial_apicid which will be used
578 * in init_intel_cacheinfo()
580 detect_extended_topology(c);
582 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
584 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
587 c->x86_max_cores = intel_num_cpu_cores(c);
593 l2 = init_intel_cacheinfo(c);
595 /* Detect legacy cache sizes if init_intel_cacheinfo did not */
597 cpu_detect_cache_sizes(c);
598 l2 = c->x86_cache_size;
601 if (c->cpuid_level > 9) {
602 unsigned eax = cpuid_eax(10);
603 /* Check for version and the number of counters */
604 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
605 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
608 if (cpu_has(c, X86_FEATURE_XMM2))
609 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
611 if (boot_cpu_has(X86_FEATURE_DS)) {
613 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
615 set_cpu_cap(c, X86_FEATURE_BTS);
617 set_cpu_cap(c, X86_FEATURE_PEBS);
620 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_CLFLUSH) &&
621 (c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47))
622 set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR);
624 if (c->x86 == 6 && boot_cpu_has(X86_FEATURE_MWAIT) &&
625 ((c->x86_model == INTEL_FAM6_ATOM_GOLDMONT)))
626 set_cpu_bug(c, X86_BUG_MONITOR);
630 c->x86_cache_alignment = c->x86_clflush_size * 2;
632 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
635 * Names for the Pentium II/Celeron processors
636 * detectable only by also checking the cache size.
637 * Dixon is NOT a Celeron.
642 switch (c->x86_model) {
645 p = "Celeron (Covington)";
647 p = "Mobile Pentium II (Dixon)";
652 p = "Celeron (Mendocino)";
653 else if (c->x86_mask == 0 || c->x86_mask == 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 if (cpu_has(c, X86_FEATURE_VMX))
677 detect_vmx_virtcap(c);
679 init_intel_energy_perf(c);
681 init_intel_misc_features(c);
685 static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
688 * Intel PIII Tualatin. This comes in two flavours.
689 * One has 256kb of cache, the other 512. We have no way
690 * to determine which, so we use a boottime override
691 * for the 512kb model, and assume 256 otherwise.
693 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
697 * Intel Quark SoC X1000 contains a 4-way set associative
698 * 16K cache with a 16 byte cache line and 256 lines per tag
700 if ((c->x86 == 5) && (c->x86_model == 9))
706 #define TLB_INST_4K 0x01
707 #define TLB_INST_4M 0x02
708 #define TLB_INST_2M_4M 0x03
710 #define TLB_INST_ALL 0x05
711 #define TLB_INST_1G 0x06
713 #define TLB_DATA_4K 0x11
714 #define TLB_DATA_4M 0x12
715 #define TLB_DATA_2M_4M 0x13
716 #define TLB_DATA_4K_4M 0x14
718 #define TLB_DATA_1G 0x16
720 #define TLB_DATA0_4K 0x21
721 #define TLB_DATA0_4M 0x22
722 #define TLB_DATA0_2M_4M 0x23
725 #define STLB_4K_2M 0x42
727 static const struct _tlb_table intel_tlb_table[] = {
728 { 0x01, TLB_INST_4K, 32, " TLB_INST 4 KByte pages, 4-way set associative" },
729 { 0x02, TLB_INST_4M, 2, " TLB_INST 4 MByte pages, full associative" },
730 { 0x03, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way set associative" },
731 { 0x04, TLB_DATA_4M, 8, " TLB_DATA 4 MByte pages, 4-way set associative" },
732 { 0x05, TLB_DATA_4M, 32, " TLB_DATA 4 MByte pages, 4-way set associative" },
733 { 0x0b, TLB_INST_4M, 4, " TLB_INST 4 MByte pages, 4-way set associative" },
734 { 0x4f, TLB_INST_4K, 32, " TLB_INST 4 KByte pages */" },
735 { 0x50, TLB_INST_ALL, 64, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
736 { 0x51, TLB_INST_ALL, 128, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
737 { 0x52, TLB_INST_ALL, 256, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
738 { 0x55, TLB_INST_2M_4M, 7, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
739 { 0x56, TLB_DATA0_4M, 16, " TLB_DATA0 4 MByte pages, 4-way set associative" },
740 { 0x57, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, 4-way associative" },
741 { 0x59, TLB_DATA0_4K, 16, " TLB_DATA0 4 KByte pages, fully associative" },
742 { 0x5a, TLB_DATA0_2M_4M, 32, " TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative" },
743 { 0x5b, TLB_DATA_4K_4M, 64, " TLB_DATA 4 KByte and 4 MByte pages" },
744 { 0x5c, TLB_DATA_4K_4M, 128, " TLB_DATA 4 KByte and 4 MByte pages" },
745 { 0x5d, TLB_DATA_4K_4M, 256, " TLB_DATA 4 KByte and 4 MByte pages" },
746 { 0x61, TLB_INST_4K, 48, " TLB_INST 4 KByte pages, full associative" },
747 { 0x63, TLB_DATA_1G, 4, " TLB_DATA 1 GByte pages, 4-way set associative" },
748 { 0x76, TLB_INST_2M_4M, 8, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
749 { 0xb0, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 4-way set associative" },
750 { 0xb1, TLB_INST_2M_4M, 4, " TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries" },
751 { 0xb2, TLB_INST_4K, 64, " TLB_INST 4KByte pages, 4-way set associative" },
752 { 0xb3, TLB_DATA_4K, 128, " TLB_DATA 4 KByte pages, 4-way set associative" },
753 { 0xb4, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 4-way associative" },
754 { 0xb5, TLB_INST_4K, 64, " TLB_INST 4 KByte pages, 8-way set associative" },
755 { 0xb6, TLB_INST_4K, 128, " TLB_INST 4 KByte pages, 8-way set associative" },
756 { 0xba, TLB_DATA_4K, 64, " TLB_DATA 4 KByte pages, 4-way associative" },
757 { 0xc0, TLB_DATA_4K_4M, 8, " TLB_DATA 4 KByte and 4 MByte pages, 4-way associative" },
758 { 0xc1, STLB_4K_2M, 1024, " STLB 4 KByte and 2 MByte pages, 8-way associative" },
759 { 0xc2, TLB_DATA_2M_4M, 16, " DTLB 2 MByte/4MByte pages, 4-way associative" },
760 { 0xca, STLB_4K, 512, " STLB 4 KByte pages, 4-way associative" },
764 static void intel_tlb_lookup(const unsigned char desc)
770 /* look up this descriptor in the table */
771 for (k = 0; intel_tlb_table[k].descriptor != desc && \
772 intel_tlb_table[k].descriptor != 0; k++)
775 if (intel_tlb_table[k].tlb_type == 0)
778 switch (intel_tlb_table[k].tlb_type) {
780 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
781 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
782 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
783 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
786 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
787 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
788 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
789 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
790 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
791 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
792 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
793 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
794 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
795 tlb_lli_4m[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 if (tlb_lli_4k[ENTRIES] < intel_tlb_table[k].entries)
801 tlb_lli_4k[ENTRIES] = intel_tlb_table[k].entries;
802 if (tlb_lli_2m[ENTRIES] < intel_tlb_table[k].entries)
803 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
804 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
805 tlb_lli_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;
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_2m[ENTRIES] < intel_tlb_table[k].entries)
817 tlb_lli_2m[ENTRIES] = intel_tlb_table[k].entries;
818 if (tlb_lli_4m[ENTRIES] < intel_tlb_table[k].entries)
819 tlb_lli_4m[ENTRIES] = intel_tlb_table[k].entries;
823 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
824 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
828 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
829 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
832 case TLB_DATA0_2M_4M:
833 if (tlb_lld_2m[ENTRIES] < intel_tlb_table[k].entries)
834 tlb_lld_2m[ENTRIES] = intel_tlb_table[k].entries;
835 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
836 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
839 if (tlb_lld_4k[ENTRIES] < intel_tlb_table[k].entries)
840 tlb_lld_4k[ENTRIES] = intel_tlb_table[k].entries;
841 if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries)
842 tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries;
845 if (tlb_lld_1g[ENTRIES] < intel_tlb_table[k].entries)
846 tlb_lld_1g[ENTRIES] = intel_tlb_table[k].entries;
851 static void intel_detect_tlb(struct cpuinfo_x86 *c)
854 unsigned int regs[4];
855 unsigned char *desc = (unsigned char *)regs;
857 if (c->cpuid_level < 2)
860 /* Number of times to iterate */
861 n = cpuid_eax(2) & 0xFF;
863 for (i = 0 ; i < n ; i++) {
864 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
866 /* If bit 31 is set, this is an unknown format */
867 for (j = 0 ; j < 3 ; j++)
868 if (regs[j] & (1 << 31))
871 /* Byte 0 is level count, not a descriptor */
872 for (j = 1 ; j < 16 ; j++)
873 intel_tlb_lookup(desc[j]);
877 static const struct cpu_dev intel_cpu_dev = {
879 .c_ident = { "GenuineIntel" },
882 { .family = 4, .model_names =
884 [0] = "486 DX-25/33",
895 { .family = 5, .model_names =
897 [0] = "Pentium 60/66 A-step",
898 [1] = "Pentium 60/66",
899 [2] = "Pentium 75 - 200",
900 [3] = "OverDrive PODP5V83",
902 [7] = "Mobile Pentium 75 - 200",
903 [8] = "Mobile Pentium MMX",
904 [9] = "Quark SoC X1000",
907 { .family = 6, .model_names =
909 [0] = "Pentium Pro A-step",
911 [3] = "Pentium II (Klamath)",
912 [4] = "Pentium II (Deschutes)",
913 [5] = "Pentium II (Deschutes)",
914 [6] = "Mobile Pentium II",
915 [7] = "Pentium III (Katmai)",
916 [8] = "Pentium III (Coppermine)",
917 [10] = "Pentium III (Cascades)",
918 [11] = "Pentium III (Tualatin)",
921 { .family = 15, .model_names =
923 [0] = "Pentium 4 (Unknown)",
924 [1] = "Pentium 4 (Willamette)",
925 [2] = "Pentium 4 (Northwood)",
926 [4] = "Pentium 4 (Foster)",
927 [5] = "Pentium 4 (Foster)",
931 .legacy_cache_size = intel_size_cache,
933 .c_detect_tlb = intel_detect_tlb,
934 .c_early_init = early_init_intel,
935 .c_init = init_intel,
936 .c_bsp_resume = intel_bsp_resume,
937 .c_x86_vendor = X86_VENDOR_INTEL,
940 cpu_dev_register(intel_cpu_dev);