1 #include <linux/init.h>
2 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/bitops.h>
7 #include <linux/sched.h>
8 #include <linux/thread_info.h>
9 #include <linux/module.h>
11 #include <asm/processor.h>
12 #include <asm/pgtable.h>
14 #include <asm/uaccess.h>
20 #include <asm/topology.h>
21 #include <asm/numa_64.h>
26 #ifdef CONFIG_X86_LOCAL_APIC
27 #include <asm/mpspec.h>
31 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
33 /* Unmask CPUID levels if masked: */
34 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
37 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
39 if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
40 misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
41 wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
42 c->cpuid_level = cpuid_eax(0);
46 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
47 (c->x86 == 0x6 && c->x86_model >= 0x0e))
48 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
51 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
53 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
54 if (c->x86 == 15 && c->x86_cache_alignment == 64)
55 c->x86_cache_alignment = 128;
58 /* CPUID workaround for 0F33/0F34 CPU */
59 if (c->x86 == 0xF && c->x86_model == 0x3
60 && (c->x86_mask == 0x3 || c->x86_mask == 0x4))
61 c->x86_phys_bits = 36;
64 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
65 * with P/T states and does not stop in deep C-states.
67 * It is also reliable across cores and sockets. (but not across
68 * cabinets - we turn it off in that case explicitly.)
70 if (c->x86_power & (1 << 8)) {
71 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
72 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
73 set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
74 sched_clock_stable = 1;
78 * There is a known erratum on Pentium III and Core Solo
80 * " Page with PAT set to WC while associated MTRR is UC
81 * may consolidate to UC "
82 * Because of this erratum, it is better to stick with
83 * setting WC in MTRR rather than using PAT on these CPUs.
85 * Enable PAT WC only on P4, Core 2 or later CPUs.
87 if (c->x86 == 6 && c->x86_model < 15)
88 clear_cpu_cap(c, X86_FEATURE_PAT);
93 * Early probe support logic for ppro memory erratum #50
95 * This is called before we do cpu ident work
98 int __cpuinit ppro_with_ram_bug(void)
100 /* Uses data from early_cpu_detect now */
101 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
102 boot_cpu_data.x86 == 6 &&
103 boot_cpu_data.x86_model == 1 &&
104 boot_cpu_data.x86_mask < 8) {
105 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
111 #ifdef CONFIG_X86_F00F_BUG
112 static void __cpuinit trap_init_f00f_bug(void)
114 __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
117 * Update the IDT descriptor and reload the IDT so that
118 * it uses the read-only mapped virtual address.
120 idt_descr.address = fix_to_virt(FIX_F00F_IDT);
121 load_idt(&idt_descr);
125 static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
128 /* calling is from identify_secondary_cpu() ? */
129 if (c->cpu_index == boot_cpu_id)
133 * Mask B, Pentium, but not Pentium MMX
136 c->x86_mask >= 1 && c->x86_mask <= 4 &&
139 * Remember we have B step Pentia with bugs
141 WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
142 "with B stepping processors.\n");
147 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
149 unsigned long lo, hi;
151 #ifdef CONFIG_X86_F00F_BUG
153 * All current models of Pentium and Pentium with MMX technology CPUs
154 * have the F0 0F bug, which lets nonprivileged users lock up the system.
155 * Note that the workaround only should be initialized once...
158 if (!paravirt_enabled() && c->x86 == 5) {
159 static int f00f_workaround_enabled;
162 if (!f00f_workaround_enabled) {
163 trap_init_f00f_bug();
164 printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
165 f00f_workaround_enabled = 1;
171 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
174 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
175 clear_cpu_cap(c, X86_FEATURE_SEP);
178 * P4 Xeon errata 037 workaround.
179 * Hardware prefetcher may cause stale data to be loaded into the cache.
181 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
182 rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
183 if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
184 printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
185 printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
186 lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
187 wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
192 * See if we have a good local APIC by checking for buggy Pentia,
193 * i.e. all B steppings and the C2 stepping of P54C when using their
194 * integrated APIC (see 11AP erratum in "Pentium Processor
195 * Specification Update").
197 if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
198 (c->x86_mask < 0x6 || c->x86_mask == 0xb))
199 set_cpu_cap(c, X86_FEATURE_11AP);
202 #ifdef CONFIG_X86_INTEL_USERCOPY
204 * Set up the preferred alignment for movsl bulk memory moves
207 case 4: /* 486: untested */
209 case 5: /* Old Pentia: untested */
211 case 6: /* PII/PIII only like movsl with 8-byte alignment */
214 case 15: /* P4 is OK down to 8-byte alignment */
220 #ifdef CONFIG_X86_NUMAQ
227 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
232 static void __cpuinit srat_detect_node(void)
234 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
236 int cpu = smp_processor_id();
237 int apicid = hard_smp_processor_id();
239 /* Don't do the funky fallback heuristics the AMD version employs
241 node = apicid_to_node[apicid];
242 if (node == NUMA_NO_NODE || !node_online(node))
243 node = first_node(node_online_map);
244 numa_set_node(cpu, node);
246 printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
251 * find out the number of processor cores on the die
253 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
255 unsigned int eax, ebx, ecx, edx;
257 if (c->cpuid_level < 4)
260 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
261 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
263 return ((eax >> 26) + 1);
268 static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
270 /* Intel VMX MSR indicated features */
271 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
272 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
273 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
274 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
275 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
276 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
278 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
280 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
281 clear_cpu_cap(c, X86_FEATURE_VNMI);
282 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
283 clear_cpu_cap(c, X86_FEATURE_EPT);
284 clear_cpu_cap(c, X86_FEATURE_VPID);
286 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
287 msr_ctl = vmx_msr_high | vmx_msr_low;
288 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
289 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
290 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
291 set_cpu_cap(c, X86_FEATURE_VNMI);
292 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
293 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
294 vmx_msr_low, vmx_msr_high);
295 msr_ctl2 = vmx_msr_high | vmx_msr_low;
296 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
297 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
298 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
299 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
300 set_cpu_cap(c, X86_FEATURE_EPT);
301 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
302 set_cpu_cap(c, X86_FEATURE_VPID);
306 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
312 intel_workarounds(c);
315 * Detect the extended topology information if available. This
316 * will reinitialise the initial_apicid which will be used
317 * in init_intel_cacheinfo()
319 detect_extended_topology(c);
321 l2 = init_intel_cacheinfo(c);
322 if (c->cpuid_level > 9) {
323 unsigned eax = cpuid_eax(10);
324 /* Check for version and the number of counters */
325 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
326 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
330 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
333 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
335 set_cpu_cap(c, X86_FEATURE_BTS);
337 set_cpu_cap(c, X86_FEATURE_PEBS);
341 if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush)
342 set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
346 c->x86_cache_alignment = c->x86_clflush_size * 2;
348 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
351 * Names for the Pentium II/Celeron processors
352 * detectable only by also checking the cache size.
353 * Dixon is NOT a Celeron.
358 switch (c->x86_model) {
360 if (c->x86_mask == 0) {
362 p = "Celeron (Covington)";
364 p = "Mobile Pentium II (Dixon)";
370 p = "Celeron (Mendocino)";
371 else if (c->x86_mask == 0 || c->x86_mask == 5)
377 p = "Celeron (Coppermine)";
382 strcpy(c->x86_model_id, p);
386 set_cpu_cap(c, X86_FEATURE_P4);
388 set_cpu_cap(c, X86_FEATURE_P3);
391 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
393 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
396 c->x86_max_cores = intel_num_cpu_cores(c);
402 /* Work around errata */
405 if (cpu_has(c, X86_FEATURE_VMX))
406 detect_vmx_virtcap(c);
410 static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
413 * Intel PIII Tualatin. This comes in two flavours.
414 * One has 256kb of cache, the other 512. We have no way
415 * to determine which, so we use a boottime override
416 * for the 512kb model, and assume 256 otherwise.
418 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
424 static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
426 .c_ident = { "GenuineIntel" },
429 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
431 [0] = "486 DX-25/33",
442 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
444 [0] = "Pentium 60/66 A-step",
445 [1] = "Pentium 60/66",
446 [2] = "Pentium 75 - 200",
447 [3] = "OverDrive PODP5V83",
449 [7] = "Mobile Pentium 75 - 200",
450 [8] = "Mobile Pentium MMX"
453 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
455 [0] = "Pentium Pro A-step",
457 [3] = "Pentium II (Klamath)",
458 [4] = "Pentium II (Deschutes)",
459 [5] = "Pentium II (Deschutes)",
460 [6] = "Mobile Pentium II",
461 [7] = "Pentium III (Katmai)",
462 [8] = "Pentium III (Coppermine)",
463 [10] = "Pentium III (Cascades)",
464 [11] = "Pentium III (Tualatin)",
467 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
469 [0] = "Pentium 4 (Unknown)",
470 [1] = "Pentium 4 (Willamette)",
471 [2] = "Pentium 4 (Northwood)",
472 [4] = "Pentium 4 (Foster)",
473 [5] = "Pentium 4 (Foster)",
477 .c_size_cache = intel_size_cache,
479 .c_early_init = early_init_intel,
480 .c_init = init_intel,
481 .c_x86_vendor = X86_VENDOR_INTEL,
484 cpu_dev_register(intel_cpu_dev);