1 #include <linux/init.h>
2 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/bitops.h>
7 #include <linux/thread_info.h>
8 #include <linux/module.h>
10 #include <asm/processor.h>
11 #include <asm/pgtable.h>
13 #include <asm/uaccess.h>
18 #include <asm/topology.h>
19 #include <asm/numa_64.h>
24 #ifdef CONFIG_X86_LOCAL_APIC
25 #include <asm/mpspec.h>
27 #include <asm/genapic.h>
30 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
32 /* Unmask CPUID levels if masked: */
33 if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
36 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
38 if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
39 misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
40 wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
41 c->cpuid_level = cpuid_eax(0);
45 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
46 (c->x86 == 0x6 && c->x86_model >= 0x0e))
47 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
50 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
52 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
53 if (c->x86 == 15 && c->x86_cache_alignment == 64)
54 c->x86_cache_alignment = 128;
58 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
59 * with P/T states and does not stop in deep C-states
61 if (c->x86_power & (1 << 8)) {
62 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
63 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
67 * There is a known erratum on Pentium III and Core Solo
69 * " Page with PAT set to WC while associated MTRR is UC
70 * may consolidate to UC "
71 * Because of this erratum, it is better to stick with
72 * setting WC in MTRR rather than using PAT on these CPUs.
74 * Enable PAT WC only on P4, Core 2 or later CPUs.
76 if (c->x86 == 6 && c->x86_model < 15)
77 clear_cpu_cap(c, X86_FEATURE_PAT);
82 * Early probe support logic for ppro memory erratum #50
84 * This is called before we do cpu ident work
87 int __cpuinit ppro_with_ram_bug(void)
89 /* Uses data from early_cpu_detect now */
90 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
91 boot_cpu_data.x86 == 6 &&
92 boot_cpu_data.x86_model == 1 &&
93 boot_cpu_data.x86_mask < 8) {
94 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
100 #ifdef CONFIG_X86_F00F_BUG
101 static void __cpuinit trap_init_f00f_bug(void)
103 __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
106 * Update the IDT descriptor and reload the IDT so that
107 * it uses the read-only mapped virtual address.
109 idt_descr.address = fix_to_virt(FIX_F00F_IDT);
110 load_idt(&idt_descr);
114 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
116 unsigned long lo, hi;
118 #ifdef CONFIG_X86_F00F_BUG
120 * All current models of Pentium and Pentium with MMX technology CPUs
121 * have the F0 0F bug, which lets nonprivileged users lock up the system.
122 * Note that the workaround only should be initialized once...
125 if (!paravirt_enabled() && c->x86 == 5) {
126 static int f00f_workaround_enabled;
129 if (!f00f_workaround_enabled) {
130 trap_init_f00f_bug();
131 printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
132 f00f_workaround_enabled = 1;
138 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
141 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
142 clear_cpu_cap(c, X86_FEATURE_SEP);
145 * P4 Xeon errata 037 workaround.
146 * Hardware prefetcher may cause stale data to be loaded into the cache.
148 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
149 rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
150 if ((lo & (1<<9)) == 0) {
151 printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
152 printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
153 lo |= (1<<9); /* Disable hw prefetching */
154 wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
159 * See if we have a good local APIC by checking for buggy Pentia,
160 * i.e. all B steppings and the C2 stepping of P54C when using their
161 * integrated APIC (see 11AP erratum in "Pentium Processor
162 * Specification Update").
164 if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
165 (c->x86_mask < 0x6 || c->x86_mask == 0xb))
166 set_cpu_cap(c, X86_FEATURE_11AP);
169 #ifdef CONFIG_X86_INTEL_USERCOPY
171 * Set up the preferred alignment for movsl bulk memory moves
174 case 4: /* 486: untested */
176 case 5: /* Old Pentia: untested */
178 case 6: /* PII/PIII only like movsl with 8-byte alignment */
181 case 15: /* P4 is OK down to 8-byte alignment */
187 #ifdef CONFIG_X86_NUMAQ
192 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
197 static void __cpuinit srat_detect_node(void)
199 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
201 int cpu = smp_processor_id();
202 int apicid = hard_smp_processor_id();
204 /* Don't do the funky fallback heuristics the AMD version employs
206 node = apicid_to_node[apicid];
207 if (node == NUMA_NO_NODE || !node_online(node))
208 node = first_node(node_online_map);
209 numa_set_node(cpu, node);
211 printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
216 * find out the number of processor cores on the die
218 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
220 unsigned int eax, ebx, ecx, edx;
222 if (c->cpuid_level < 4)
225 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
226 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
228 return ((eax >> 26) + 1);
233 static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
235 /* Intel VMX MSR indicated features */
236 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
237 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
238 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
239 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
240 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
241 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
243 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
245 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
246 clear_cpu_cap(c, X86_FEATURE_VNMI);
247 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
248 clear_cpu_cap(c, X86_FEATURE_EPT);
249 clear_cpu_cap(c, X86_FEATURE_VPID);
251 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
252 msr_ctl = vmx_msr_high | vmx_msr_low;
253 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
254 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
255 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
256 set_cpu_cap(c, X86_FEATURE_VNMI);
257 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
258 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
259 vmx_msr_low, vmx_msr_high);
260 msr_ctl2 = vmx_msr_high | vmx_msr_low;
261 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
262 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
263 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
264 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
265 set_cpu_cap(c, X86_FEATURE_EPT);
266 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
267 set_cpu_cap(c, X86_FEATURE_VPID);
271 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
277 intel_workarounds(c);
280 * Detect the extended topology information if available. This
281 * will reinitialise the initial_apicid which will be used
282 * in init_intel_cacheinfo()
284 detect_extended_topology(c);
286 l2 = init_intel_cacheinfo(c);
287 if (c->cpuid_level > 9) {
288 unsigned eax = cpuid_eax(10);
289 /* Check for version and the number of counters */
290 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
291 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
295 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
298 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
300 set_cpu_cap(c, X86_FEATURE_BTS);
302 set_cpu_cap(c, X86_FEATURE_PEBS);
306 if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush)
307 set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
311 c->x86_cache_alignment = c->x86_clflush_size * 2;
313 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
316 * Names for the Pentium II/Celeron processors
317 * detectable only by also checking the cache size.
318 * Dixon is NOT a Celeron.
323 switch (c->x86_model) {
325 if (c->x86_mask == 0) {
327 p = "Celeron (Covington)";
329 p = "Mobile Pentium II (Dixon)";
335 p = "Celeron (Mendocino)";
336 else if (c->x86_mask == 0 || c->x86_mask == 5)
342 p = "Celeron (Coppermine)";
347 strcpy(c->x86_model_id, p);
351 set_cpu_cap(c, X86_FEATURE_P4);
353 set_cpu_cap(c, X86_FEATURE_P3);
356 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
358 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
361 c->x86_max_cores = intel_num_cpu_cores(c);
367 /* Work around errata */
370 if (cpu_has(c, X86_FEATURE_VMX))
371 detect_vmx_virtcap(c);
375 static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
378 * Intel PIII Tualatin. This comes in two flavours.
379 * One has 256kb of cache, the other 512. We have no way
380 * to determine which, so we use a boottime override
381 * for the 512kb model, and assume 256 otherwise.
383 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
389 static struct cpu_dev intel_cpu_dev __cpuinitdata = {
391 .c_ident = { "GenuineIntel" },
394 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
396 [0] = "486 DX-25/33",
407 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
409 [0] = "Pentium 60/66 A-step",
410 [1] = "Pentium 60/66",
411 [2] = "Pentium 75 - 200",
412 [3] = "OverDrive PODP5V83",
414 [7] = "Mobile Pentium 75 - 200",
415 [8] = "Mobile Pentium MMX"
418 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
420 [0] = "Pentium Pro A-step",
422 [3] = "Pentium II (Klamath)",
423 [4] = "Pentium II (Deschutes)",
424 [5] = "Pentium II (Deschutes)",
425 [6] = "Mobile Pentium II",
426 [7] = "Pentium III (Katmai)",
427 [8] = "Pentium III (Coppermine)",
428 [10] = "Pentium III (Cascades)",
429 [11] = "Pentium III (Tualatin)",
432 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
434 [0] = "Pentium 4 (Unknown)",
435 [1] = "Pentium 4 (Willamette)",
436 [2] = "Pentium 4 (Northwood)",
437 [4] = "Pentium 4 (Foster)",
438 [5] = "Pentium 4 (Foster)",
442 .c_size_cache = intel_size_cache,
444 .c_early_init = early_init_intel,
445 .c_init = init_intel,
446 .c_x86_vendor = X86_VENDOR_INTEL,
449 cpu_dev_register(intel_cpu_dev);