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/11/2018/03/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_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
)
147 * We know that the hypervisor lie to us on the microcode version so
148 * we may as well hope that it is running the correct version.
150 if (cpu_has(c
, X86_FEATURE_HYPERVISOR
))
156 for (i
= 0; i
< ARRAY_SIZE(spectre_bad_microcodes
); i
++) {
157 if (c
->x86_model
== spectre_bad_microcodes
[i
].model
&&
158 c
->x86_stepping
== spectre_bad_microcodes
[i
].stepping
)
159 return (c
->microcode
<= spectre_bad_microcodes
[i
].microcode
);
164 static void early_init_intel(struct cpuinfo_x86
*c
)
168 /* Unmask CPUID levels if masked: */
169 if (c
->x86
> 6 || (c
->x86
== 6 && c
->x86_model
>= 0xd)) {
170 if (msr_clear_bit(MSR_IA32_MISC_ENABLE
,
171 MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT
) > 0) {
172 c
->cpuid_level
= cpuid_eax(0);
177 if ((c
->x86
== 0xf && c
->x86_model
>= 0x03) ||
178 (c
->x86
== 0x6 && c
->x86_model
>= 0x0e))
179 set_cpu_cap(c
, X86_FEATURE_CONSTANT_TSC
);
181 if (c
->x86
>= 6 && !cpu_has(c
, X86_FEATURE_IA64
))
182 c
->microcode
= intel_get_microcode_revision();
184 /* Now if any of them are set, check the blacklist and clear the lot */
185 if ((cpu_has(c
, X86_FEATURE_SPEC_CTRL
) ||
186 cpu_has(c
, X86_FEATURE_INTEL_STIBP
) ||
187 cpu_has(c
, X86_FEATURE_IBRS
) || cpu_has(c
, X86_FEATURE_IBPB
) ||
188 cpu_has(c
, X86_FEATURE_STIBP
)) && bad_spectre_microcode(c
)) {
189 pr_warn("Intel Spectre v2 broken microcode detected; disabling Speculation Control\n");
190 setup_clear_cpu_cap(X86_FEATURE_IBRS
);
191 setup_clear_cpu_cap(X86_FEATURE_IBPB
);
192 setup_clear_cpu_cap(X86_FEATURE_STIBP
);
193 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL
);
194 setup_clear_cpu_cap(X86_FEATURE_MSR_SPEC_CTRL
);
195 setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP
);
196 setup_clear_cpu_cap(X86_FEATURE_SSBD
);
197 setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL_SSBD
);
201 * Atom erratum AAE44/AAF40/AAG38/AAH41:
203 * A race condition between speculative fetches and invalidating
204 * a large page. This is worked around in microcode, but we
205 * need the microcode to have already been loaded... so if it is
206 * not, recommend a BIOS update and disable large pages.
208 if (c
->x86
== 6 && c
->x86_model
== 0x1c && c
->x86_stepping
<= 2 &&
209 c
->microcode
< 0x20e) {
210 pr_warn("Atom PSE erratum detected, BIOS microcode update recommended\n");
211 clear_cpu_cap(c
, X86_FEATURE_PSE
);
215 set_cpu_cap(c
, X86_FEATURE_SYSENTER32
);
217 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
218 if (c
->x86
== 15 && c
->x86_cache_alignment
== 64)
219 c
->x86_cache_alignment
= 128;
222 /* CPUID workaround for 0F33/0F34 CPU */
223 if (c
->x86
== 0xF && c
->x86_model
== 0x3
224 && (c
->x86_stepping
== 0x3 || c
->x86_stepping
== 0x4))
225 c
->x86_phys_bits
= 36;
228 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
229 * with P/T states and does not stop in deep C-states.
231 * It is also reliable across cores and sockets. (but not across
232 * cabinets - we turn it off in that case explicitly.)
234 if (c
->x86_power
& (1 << 8)) {
235 set_cpu_cap(c
, X86_FEATURE_CONSTANT_TSC
);
236 set_cpu_cap(c
, X86_FEATURE_NONSTOP_TSC
);
239 /* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
241 switch (c
->x86_model
) {
242 case 0x27: /* Penwell */
243 case 0x35: /* Cloverview */
244 case 0x4a: /* Merrifield */
245 set_cpu_cap(c
, X86_FEATURE_NONSTOP_TSC_S3
);
253 * There is a known erratum on Pentium III and Core Solo
255 * " Page with PAT set to WC while associated MTRR is UC
256 * may consolidate to UC "
257 * Because of this erratum, it is better to stick with
258 * setting WC in MTRR rather than using PAT on these CPUs.
260 * Enable PAT WC only on P4, Core 2 or later CPUs.
262 if (c
->x86
== 6 && c
->x86_model
< 15)
263 clear_cpu_cap(c
, X86_FEATURE_PAT
);
266 * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
267 * clear the fast string and enhanced fast string CPU capabilities.
269 if (c
->x86
> 6 || (c
->x86
== 6 && c
->x86_model
>= 0xd)) {
270 rdmsrl(MSR_IA32_MISC_ENABLE
, misc_enable
);
271 if (!(misc_enable
& MSR_IA32_MISC_ENABLE_FAST_STRING
)) {
272 pr_info("Disabled fast string operations\n");
273 setup_clear_cpu_cap(X86_FEATURE_REP_GOOD
);
274 setup_clear_cpu_cap(X86_FEATURE_ERMS
);
279 * Intel Quark Core DevMan_001.pdf section 6.4.11
280 * "The operating system also is required to invalidate (i.e., flush)
281 * the TLB when any changes are made to any of the page table entries.
282 * The operating system must reload CR3 to cause the TLB to be flushed"
284 * As a result, boot_cpu_has(X86_FEATURE_PGE) in arch/x86/include/asm/tlbflush.h
285 * should be false so that __flush_tlb_all() causes CR3 insted of CR4.PGE
288 if (c
->x86
== 5 && c
->x86_model
== 9) {
289 pr_info("Disabling PGE capability bit\n");
290 setup_clear_cpu_cap(X86_FEATURE_PGE
);
293 if (c
->cpuid_level
>= 0x00000001) {
294 u32 eax
, ebx
, ecx
, edx
;
296 cpuid(0x00000001, &eax
, &ebx
, &ecx
, &edx
);
298 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
299 * apicids which are reserved per package. Store the resulting
300 * shift value for the package management code.
302 if (edx
& (1U << 28))
303 c
->x86_coreid_bits
= get_count_order((ebx
>> 16) & 0xff);
306 check_mpx_erratum(c
);
309 * Get the number of SMT siblings early from the extended topology
310 * leaf, if available. Otherwise try the legacy SMT detection.
312 if (detect_extended_topology_early(c
) < 0)
318 * Early probe support logic for ppro memory erratum #50
320 * This is called before we do cpu ident work
323 int ppro_with_ram_bug(void)
325 /* Uses data from early_cpu_detect now */
326 if (boot_cpu_data
.x86_vendor
== X86_VENDOR_INTEL
&&
327 boot_cpu_data
.x86
== 6 &&
328 boot_cpu_data
.x86_model
== 1 &&
329 boot_cpu_data
.x86_stepping
< 8) {
330 pr_info("Pentium Pro with Errata#50 detected. Taking evasive action.\n");
336 static void intel_smp_check(struct cpuinfo_x86
*c
)
338 /* calling is from identify_secondary_cpu() ? */
343 * Mask B, Pentium, but not Pentium MMX
346 c
->x86_stepping
>= 1 && c
->x86_stepping
<= 4 &&
349 * Remember we have B step Pentia with bugs
351 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
352 "with B stepping processors.\n");
357 static int __init
forcepae_setup(char *__unused
)
362 __setup("forcepae", forcepae_setup
);
364 static void intel_workarounds(struct cpuinfo_x86
*c
)
366 #ifdef CONFIG_X86_F00F_BUG
368 * All models of Pentium and Pentium with MMX technology CPUs
369 * have the F0 0F bug, which lets nonprivileged users lock up the
370 * system. Announce that the fault handler will be checking for it.
371 * The Quark is also family 5, but does not have the same bug.
373 clear_cpu_bug(c
, X86_BUG_F00F
);
374 if (c
->x86
== 5 && c
->x86_model
< 9) {
375 static int f00f_workaround_enabled
;
377 set_cpu_bug(c
, X86_BUG_F00F
);
378 if (!f00f_workaround_enabled
) {
379 pr_notice("Intel Pentium with F0 0F bug - workaround enabled.\n");
380 f00f_workaround_enabled
= 1;
386 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
389 if ((c
->x86
<<8 | c
->x86_model
<<4 | c
->x86_stepping
) < 0x633)
390 clear_cpu_cap(c
, X86_FEATURE_SEP
);
393 * PAE CPUID issue: many Pentium M report no PAE but may have a
394 * functionally usable PAE implementation.
395 * Forcefully enable PAE if kernel parameter "forcepae" is present.
398 pr_warn("PAE forced!\n");
399 set_cpu_cap(c
, X86_FEATURE_PAE
);
400 add_taint(TAINT_CPU_OUT_OF_SPEC
, LOCKDEP_NOW_UNRELIABLE
);
404 * P4 Xeon erratum 037 workaround.
405 * Hardware prefetcher may cause stale data to be loaded into the cache.
407 if ((c
->x86
== 15) && (c
->x86_model
== 1) && (c
->x86_stepping
== 1)) {
408 if (msr_set_bit(MSR_IA32_MISC_ENABLE
,
409 MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE_BIT
) > 0) {
410 pr_info("CPU: C0 stepping P4 Xeon detected.\n");
411 pr_info("CPU: Disabling hardware prefetching (Erratum 037)\n");
416 * See if we have a good local APIC by checking for buggy Pentia,
417 * i.e. all B steppings and the C2 stepping of P54C when using their
418 * integrated APIC (see 11AP erratum in "Pentium Processor
419 * Specification Update").
421 if (boot_cpu_has(X86_FEATURE_APIC
) && (c
->x86
<<8 | c
->x86_model
<<4) == 0x520 &&
422 (c
->x86_stepping
< 0x6 || c
->x86_stepping
== 0xb))
423 set_cpu_bug(c
, X86_BUG_11AP
);
426 #ifdef CONFIG_X86_INTEL_USERCOPY
428 * Set up the preferred alignment for movsl bulk memory moves
431 case 4: /* 486: untested */
433 case 5: /* Old Pentia: untested */
435 case 6: /* PII/PIII only like movsl with 8-byte alignment */
438 case 15: /* P4 is OK down to 8-byte alignment */
447 static void intel_workarounds(struct cpuinfo_x86
*c
)
452 static void srat_detect_node(struct cpuinfo_x86
*c
)
456 int cpu
= smp_processor_id();
458 /* Don't do the funky fallback heuristics the AMD version employs
460 node
= numa_cpu_node(cpu
);
461 if (node
== NUMA_NO_NODE
|| !node_online(node
)) {
462 /* reuse the value from init_cpu_to_node() */
463 node
= cpu_to_node(cpu
);
465 numa_set_node(cpu
, node
);
470 * find out the number of processor cores on the die
472 static int intel_num_cpu_cores(struct cpuinfo_x86
*c
)
474 unsigned int eax
, ebx
, ecx
, edx
;
476 if (!IS_ENABLED(CONFIG_SMP
) || c
->cpuid_level
< 4)
479 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
480 cpuid_count(4, 0, &eax
, &ebx
, &ecx
, &edx
);
482 return (eax
>> 26) + 1;
487 static void detect_vmx_virtcap(struct cpuinfo_x86
*c
)
489 /* Intel VMX MSR indicated features */
490 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
491 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
492 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
493 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
494 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
495 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
497 u32 vmx_msr_low
, vmx_msr_high
, msr_ctl
, msr_ctl2
;
499 clear_cpu_cap(c
, X86_FEATURE_TPR_SHADOW
);
500 clear_cpu_cap(c
, X86_FEATURE_VNMI
);
501 clear_cpu_cap(c
, X86_FEATURE_FLEXPRIORITY
);
502 clear_cpu_cap(c
, X86_FEATURE_EPT
);
503 clear_cpu_cap(c
, X86_FEATURE_VPID
);
505 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS
, vmx_msr_low
, vmx_msr_high
);
506 msr_ctl
= vmx_msr_high
| vmx_msr_low
;
507 if (msr_ctl
& X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW
)
508 set_cpu_cap(c
, X86_FEATURE_TPR_SHADOW
);
509 if (msr_ctl
& X86_VMX_FEATURE_PROC_CTLS_VNMI
)
510 set_cpu_cap(c
, X86_FEATURE_VNMI
);
511 if (msr_ctl
& X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS
) {
512 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2
,
513 vmx_msr_low
, vmx_msr_high
);
514 msr_ctl2
= vmx_msr_high
| vmx_msr_low
;
515 if ((msr_ctl2
& X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC
) &&
516 (msr_ctl
& X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW
))
517 set_cpu_cap(c
, X86_FEATURE_FLEXPRIORITY
);
518 if (msr_ctl2
& X86_VMX_FEATURE_PROC_CTLS2_EPT
)
519 set_cpu_cap(c
, X86_FEATURE_EPT
);
520 if (msr_ctl2
& X86_VMX_FEATURE_PROC_CTLS2_VPID
)
521 set_cpu_cap(c
, X86_FEATURE_VPID
);
525 static void init_intel_energy_perf(struct cpuinfo_x86
*c
)
530 * Initialize MSR_IA32_ENERGY_PERF_BIAS if not already initialized.
531 * (x86_energy_perf_policy(8) is available to change it at run-time.)
533 if (!cpu_has(c
, X86_FEATURE_EPB
))
536 rdmsrl(MSR_IA32_ENERGY_PERF_BIAS
, epb
);
537 if ((epb
& 0xF) != ENERGY_PERF_BIAS_PERFORMANCE
)
540 pr_warn_once("ENERGY_PERF_BIAS: Set to 'normal', was 'performance'\n");
541 pr_warn_once("ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)\n");
542 epb
= (epb
& ~0xF) | ENERGY_PERF_BIAS_NORMAL
;
543 wrmsrl(MSR_IA32_ENERGY_PERF_BIAS
, epb
);
546 static void intel_bsp_resume(struct cpuinfo_x86
*c
)
549 * MSR_IA32_ENERGY_PERF_BIAS is lost across suspend/resume,
550 * so reinitialize it properly like during bootup:
552 init_intel_energy_perf(c
);
555 static void init_cpuid_fault(struct cpuinfo_x86
*c
)
559 if (!rdmsrl_safe(MSR_PLATFORM_INFO
, &msr
)) {
560 if (msr
& MSR_PLATFORM_INFO_CPUID_FAULT
)
561 set_cpu_cap(c
, X86_FEATURE_CPUID_FAULT
);
565 static void init_intel_misc_features(struct cpuinfo_x86
*c
)
569 if (rdmsrl_safe(MSR_MISC_FEATURES_ENABLES
, &msr
))
572 /* Clear all MISC features */
573 this_cpu_write(msr_misc_features_shadow
, 0);
575 /* Check features and update capabilities and shadow control bits */
577 probe_xeon_phi_r3mwait(c
);
579 msr
= this_cpu_read(msr_misc_features_shadow
);
580 wrmsrl(MSR_MISC_FEATURES_ENABLES
, msr
);
583 static void init_intel(struct cpuinfo_x86
*c
)
589 intel_workarounds(c
);
592 * Detect the extended topology information if available. This
593 * will reinitialise the initial_apicid which will be used
594 * in init_intel_cacheinfo()
596 detect_extended_topology(c
);
598 if (!cpu_has(c
, X86_FEATURE_XTOPOLOGY
)) {
600 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
603 c
->x86_max_cores
= intel_num_cpu_cores(c
);
609 l2
= init_intel_cacheinfo(c
);
611 /* Detect legacy cache sizes if init_intel_cacheinfo did not */
613 cpu_detect_cache_sizes(c
);
614 l2
= c
->x86_cache_size
;
617 if (c
->cpuid_level
> 9) {
618 unsigned eax
= cpuid_eax(10);
619 /* Check for version and the number of counters */
620 if ((eax
& 0xff) && (((eax
>>8) & 0xff) > 1))
621 set_cpu_cap(c
, X86_FEATURE_ARCH_PERFMON
);
624 if (cpu_has(c
, X86_FEATURE_XMM2
))
625 set_cpu_cap(c
, X86_FEATURE_LFENCE_RDTSC
);
627 if (boot_cpu_has(X86_FEATURE_DS
)) {
629 rdmsr(MSR_IA32_MISC_ENABLE
, l1
, l2
);
631 set_cpu_cap(c
, X86_FEATURE_BTS
);
633 set_cpu_cap(c
, X86_FEATURE_PEBS
);
636 if (c
->x86
== 6 && boot_cpu_has(X86_FEATURE_CLFLUSH
) &&
637 (c
->x86_model
== 29 || c
->x86_model
== 46 || c
->x86_model
== 47))
638 set_cpu_bug(c
, X86_BUG_CLFLUSH_MONITOR
);
640 if (c
->x86
== 6 && boot_cpu_has(X86_FEATURE_MWAIT
) &&
641 ((c
->x86_model
== INTEL_FAM6_ATOM_GOLDMONT
)))
642 set_cpu_bug(c
, X86_BUG_MONITOR
);
646 c
->x86_cache_alignment
= c
->x86_clflush_size
* 2;
648 set_cpu_cap(c
, X86_FEATURE_REP_GOOD
);
651 * Names for the Pentium II/Celeron processors
652 * detectable only by also checking the cache size.
653 * Dixon is NOT a Celeron.
658 switch (c
->x86_model
) {
661 p
= "Celeron (Covington)";
663 p
= "Mobile Pentium II (Dixon)";
668 p
= "Celeron (Mendocino)";
669 else if (c
->x86_stepping
== 0 || c
->x86_stepping
== 5)
675 p
= "Celeron (Coppermine)";
680 strcpy(c
->x86_model_id
, p
);
684 set_cpu_cap(c
, X86_FEATURE_P4
);
686 set_cpu_cap(c
, X86_FEATURE_P3
);
689 /* Work around errata */
692 if (cpu_has(c
, X86_FEATURE_VMX
))
693 detect_vmx_virtcap(c
);
695 init_intel_energy_perf(c
);
697 init_intel_misc_features(c
);
699 if (tsx_ctrl_state
== TSX_CTRL_ENABLE
)
701 if (tsx_ctrl_state
== TSX_CTRL_DISABLE
)
706 static unsigned int intel_size_cache(struct cpuinfo_x86
*c
, unsigned int size
)
709 * Intel PIII Tualatin. This comes in two flavours.
710 * One has 256kb of cache, the other 512. We have no way
711 * to determine which, so we use a boottime override
712 * for the 512kb model, and assume 256 otherwise.
714 if ((c
->x86
== 6) && (c
->x86_model
== 11) && (size
== 0))
718 * Intel Quark SoC X1000 contains a 4-way set associative
719 * 16K cache with a 16 byte cache line and 256 lines per tag
721 if ((c
->x86
== 5) && (c
->x86_model
== 9))
727 #define TLB_INST_4K 0x01
728 #define TLB_INST_4M 0x02
729 #define TLB_INST_2M_4M 0x03
731 #define TLB_INST_ALL 0x05
732 #define TLB_INST_1G 0x06
734 #define TLB_DATA_4K 0x11
735 #define TLB_DATA_4M 0x12
736 #define TLB_DATA_2M_4M 0x13
737 #define TLB_DATA_4K_4M 0x14
739 #define TLB_DATA_1G 0x16
741 #define TLB_DATA0_4K 0x21
742 #define TLB_DATA0_4M 0x22
743 #define TLB_DATA0_2M_4M 0x23
746 #define STLB_4K_2M 0x42
748 static const struct _tlb_table intel_tlb_table
[] = {
749 { 0x01, TLB_INST_4K
, 32, " TLB_INST 4 KByte pages, 4-way set associative" },
750 { 0x02, TLB_INST_4M
, 2, " TLB_INST 4 MByte pages, full associative" },
751 { 0x03, TLB_DATA_4K
, 64, " TLB_DATA 4 KByte pages, 4-way set associative" },
752 { 0x04, TLB_DATA_4M
, 8, " TLB_DATA 4 MByte pages, 4-way set associative" },
753 { 0x05, TLB_DATA_4M
, 32, " TLB_DATA 4 MByte pages, 4-way set associative" },
754 { 0x0b, TLB_INST_4M
, 4, " TLB_INST 4 MByte pages, 4-way set associative" },
755 { 0x4f, TLB_INST_4K
, 32, " TLB_INST 4 KByte pages */" },
756 { 0x50, TLB_INST_ALL
, 64, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
757 { 0x51, TLB_INST_ALL
, 128, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
758 { 0x52, TLB_INST_ALL
, 256, " TLB_INST 4 KByte and 2-MByte or 4-MByte pages" },
759 { 0x55, TLB_INST_2M_4M
, 7, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
760 { 0x56, TLB_DATA0_4M
, 16, " TLB_DATA0 4 MByte pages, 4-way set associative" },
761 { 0x57, TLB_DATA0_4K
, 16, " TLB_DATA0 4 KByte pages, 4-way associative" },
762 { 0x59, TLB_DATA0_4K
, 16, " TLB_DATA0 4 KByte pages, fully associative" },
763 { 0x5a, TLB_DATA0_2M_4M
, 32, " TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative" },
764 { 0x5b, TLB_DATA_4K_4M
, 64, " TLB_DATA 4 KByte and 4 MByte pages" },
765 { 0x5c, TLB_DATA_4K_4M
, 128, " TLB_DATA 4 KByte and 4 MByte pages" },
766 { 0x5d, TLB_DATA_4K_4M
, 256, " TLB_DATA 4 KByte and 4 MByte pages" },
767 { 0x61, TLB_INST_4K
, 48, " TLB_INST 4 KByte pages, full associative" },
768 { 0x63, TLB_DATA_1G
, 4, " TLB_DATA 1 GByte pages, 4-way set associative" },
769 { 0x6b, TLB_DATA_4K
, 256, " TLB_DATA 4 KByte pages, 8-way associative" },
770 { 0x6c, TLB_DATA_2M_4M
, 128, " TLB_DATA 2 MByte or 4 MByte pages, 8-way associative" },
771 { 0x6d, TLB_DATA_1G
, 16, " TLB_DATA 1 GByte pages, fully associative" },
772 { 0x76, TLB_INST_2M_4M
, 8, " TLB_INST 2-MByte or 4-MByte pages, fully associative" },
773 { 0xb0, TLB_INST_4K
, 128, " TLB_INST 4 KByte pages, 4-way set associative" },
774 { 0xb1, TLB_INST_2M_4M
, 4, " TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries" },
775 { 0xb2, TLB_INST_4K
, 64, " TLB_INST 4KByte pages, 4-way set associative" },
776 { 0xb3, TLB_DATA_4K
, 128, " TLB_DATA 4 KByte pages, 4-way set associative" },
777 { 0xb4, TLB_DATA_4K
, 256, " TLB_DATA 4 KByte pages, 4-way associative" },
778 { 0xb5, TLB_INST_4K
, 64, " TLB_INST 4 KByte pages, 8-way set associative" },
779 { 0xb6, TLB_INST_4K
, 128, " TLB_INST 4 KByte pages, 8-way set associative" },
780 { 0xba, TLB_DATA_4K
, 64, " TLB_DATA 4 KByte pages, 4-way associative" },
781 { 0xc0, TLB_DATA_4K_4M
, 8, " TLB_DATA 4 KByte and 4 MByte pages, 4-way associative" },
782 { 0xc1, STLB_4K_2M
, 1024, " STLB 4 KByte and 2 MByte pages, 8-way associative" },
783 { 0xc2, TLB_DATA_2M_4M
, 16, " DTLB 2 MByte/4MByte pages, 4-way associative" },
784 { 0xca, STLB_4K
, 512, " STLB 4 KByte pages, 4-way associative" },
788 static void intel_tlb_lookup(const unsigned char desc
)
794 /* look up this descriptor in the table */
795 for (k
= 0; intel_tlb_table
[k
].descriptor
!= desc
&& \
796 intel_tlb_table
[k
].descriptor
!= 0; k
++)
799 if (intel_tlb_table
[k
].tlb_type
== 0)
802 switch (intel_tlb_table
[k
].tlb_type
) {
804 if (tlb_lli_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
805 tlb_lli_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
806 if (tlb_lld_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
807 tlb_lld_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
810 if (tlb_lli_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
811 tlb_lli_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
812 if (tlb_lld_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
813 tlb_lld_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
814 if (tlb_lli_2m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
815 tlb_lli_2m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
816 if (tlb_lld_2m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
817 tlb_lld_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
;
820 if (tlb_lld_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
821 tlb_lld_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
824 if (tlb_lli_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
825 tlb_lli_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
826 if (tlb_lli_2m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
827 tlb_lli_2m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
828 if (tlb_lli_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
829 tlb_lli_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
832 if (tlb_lli_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
833 tlb_lli_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
836 if (tlb_lli_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
837 tlb_lli_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
840 if (tlb_lli_2m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
841 tlb_lli_2m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
842 if (tlb_lli_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
843 tlb_lli_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
847 if (tlb_lld_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
848 tlb_lld_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
852 if (tlb_lld_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
853 tlb_lld_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
856 case TLB_DATA0_2M_4M
:
857 if (tlb_lld_2m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
858 tlb_lld_2m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
859 if (tlb_lld_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
860 tlb_lld_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
863 if (tlb_lld_4k
[ENTRIES
] < intel_tlb_table
[k
].entries
)
864 tlb_lld_4k
[ENTRIES
] = intel_tlb_table
[k
].entries
;
865 if (tlb_lld_4m
[ENTRIES
] < intel_tlb_table
[k
].entries
)
866 tlb_lld_4m
[ENTRIES
] = intel_tlb_table
[k
].entries
;
869 if (tlb_lld_1g
[ENTRIES
] < intel_tlb_table
[k
].entries
)
870 tlb_lld_1g
[ENTRIES
] = intel_tlb_table
[k
].entries
;
875 static void intel_detect_tlb(struct cpuinfo_x86
*c
)
878 unsigned int regs
[4];
879 unsigned char *desc
= (unsigned char *)regs
;
881 if (c
->cpuid_level
< 2)
884 /* Number of times to iterate */
885 n
= cpuid_eax(2) & 0xFF;
887 for (i
= 0 ; i
< n
; i
++) {
888 cpuid(2, ®s
[0], ®s
[1], ®s
[2], ®s
[3]);
890 /* If bit 31 is set, this is an unknown format */
891 for (j
= 0 ; j
< 3 ; j
++)
892 if (regs
[j
] & (1 << 31))
895 /* Byte 0 is level count, not a descriptor */
896 for (j
= 1 ; j
< 16 ; j
++)
897 intel_tlb_lookup(desc
[j
]);
901 static const struct cpu_dev intel_cpu_dev
= {
903 .c_ident
= { "GenuineIntel" },
906 { .family
= 4, .model_names
=
908 [0] = "486 DX-25/33",
919 { .family
= 5, .model_names
=
921 [0] = "Pentium 60/66 A-step",
922 [1] = "Pentium 60/66",
923 [2] = "Pentium 75 - 200",
924 [3] = "OverDrive PODP5V83",
926 [7] = "Mobile Pentium 75 - 200",
927 [8] = "Mobile Pentium MMX",
928 [9] = "Quark SoC X1000",
931 { .family
= 6, .model_names
=
933 [0] = "Pentium Pro A-step",
935 [3] = "Pentium II (Klamath)",
936 [4] = "Pentium II (Deschutes)",
937 [5] = "Pentium II (Deschutes)",
938 [6] = "Mobile Pentium II",
939 [7] = "Pentium III (Katmai)",
940 [8] = "Pentium III (Coppermine)",
941 [10] = "Pentium III (Cascades)",
942 [11] = "Pentium III (Tualatin)",
945 { .family
= 15, .model_names
=
947 [0] = "Pentium 4 (Unknown)",
948 [1] = "Pentium 4 (Willamette)",
949 [2] = "Pentium 4 (Northwood)",
950 [4] = "Pentium 4 (Foster)",
951 [5] = "Pentium 4 (Foster)",
955 .legacy_cache_size
= intel_size_cache
,
957 .c_detect_tlb
= intel_detect_tlb
,
958 .c_early_init
= early_init_intel
,
959 .c_init
= init_intel
,
960 .c_bsp_resume
= intel_bsp_resume
,
961 .c_x86_vendor
= X86_VENDOR_INTEL
,
964 cpu_dev_register(intel_cpu_dev
);