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>
14 #include <asm/ptrace.h>
19 #include <asm/topology.h>
20 #include <asm/numa_64.h>
25 #ifdef CONFIG_X86_LOCAL_APIC
26 #include <asm/mpspec.h>
28 #include <mach_apic.h>
31 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
33 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
34 (c->x86 == 0x6 && c->x86_model >= 0x0e))
35 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
38 set_cpu_cap(c, X86_FEATURE_SYSENTER32);
40 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
41 if (c->x86 == 15 && c->x86_cache_alignment == 64)
42 c->x86_cache_alignment = 128;
46 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
47 * with P/T states and does not stop in deep C-states
49 if (c->x86_power & (1 << 8)) {
50 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
51 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
58 * Early probe support logic for ppro memory erratum #50
60 * This is called before we do cpu ident work
63 int __cpuinit ppro_with_ram_bug(void)
65 /* Uses data from early_cpu_detect now */
66 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
67 boot_cpu_data.x86 == 6 &&
68 boot_cpu_data.x86_model == 1 &&
69 boot_cpu_data.x86_mask < 8) {
70 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
76 #ifdef CONFIG_X86_F00F_BUG
77 static void __cpuinit trap_init_f00f_bug(void)
79 __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
82 * Update the IDT descriptor and reload the IDT so that
83 * it uses the read-only mapped virtual address.
85 idt_descr.address = fix_to_virt(FIX_F00F_IDT);
90 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
94 #ifdef CONFIG_X86_F00F_BUG
96 * All current models of Pentium and Pentium with MMX technology CPUs
97 * have the F0 0F bug, which lets nonprivileged users lock up the system.
98 * Note that the workaround only should be initialized once...
101 if (!paravirt_enabled() && c->x86 == 5) {
102 static int f00f_workaround_enabled;
105 if (!f00f_workaround_enabled) {
106 trap_init_f00f_bug();
107 printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
108 f00f_workaround_enabled = 1;
114 * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
117 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
118 clear_cpu_cap(c, X86_FEATURE_SEP);
121 * P4 Xeon errata 037 workaround.
122 * Hardware prefetcher may cause stale data to be loaded into the cache.
124 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
125 rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
126 if ((lo & (1<<9)) == 0) {
127 printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
128 printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
129 lo |= (1<<9); /* Disable hw prefetching */
130 wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
135 * See if we have a good local APIC by checking for buggy Pentia,
136 * i.e. all B steppings and the C2 stepping of P54C when using their
137 * integrated APIC (see 11AP erratum in "Pentium Processor
138 * Specification Update").
140 if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
141 (c->x86_mask < 0x6 || c->x86_mask == 0xb))
142 set_cpu_cap(c, X86_FEATURE_11AP);
145 #ifdef CONFIG_X86_INTEL_USERCOPY
147 * Set up the preferred alignment for movsl bulk memory moves
150 case 4: /* 486: untested */
152 case 5: /* Old Pentia: untested */
154 case 6: /* PII/PIII only like movsl with 8-byte alignment */
157 case 15: /* P4 is OK down to 8-byte alignment */
163 #ifdef CONFIG_X86_NUMAQ
168 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
173 static void __cpuinit srat_detect_node(void)
175 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
177 int cpu = smp_processor_id();
178 int apicid = hard_smp_processor_id();
180 /* Don't do the funky fallback heuristics the AMD version employs
182 node = apicid_to_node[apicid];
183 if (node == NUMA_NO_NODE || !node_online(node))
184 node = first_node(node_online_map);
185 numa_set_node(cpu, node);
187 printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
192 * find out the number of processor cores on the die
194 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
196 unsigned int eax, ebx, ecx, edx;
198 if (c->cpuid_level < 4)
201 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
202 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
204 return ((eax >> 26) + 1);
209 static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
211 /* Intel VMX MSR indicated features */
212 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
213 #define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
214 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
215 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
216 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
217 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
219 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
221 clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
222 clear_cpu_cap(c, X86_FEATURE_VNMI);
223 clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
224 clear_cpu_cap(c, X86_FEATURE_EPT);
225 clear_cpu_cap(c, X86_FEATURE_VPID);
227 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
228 msr_ctl = vmx_msr_high | vmx_msr_low;
229 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
230 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
231 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
232 set_cpu_cap(c, X86_FEATURE_VNMI);
233 if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
234 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
235 vmx_msr_low, vmx_msr_high);
236 msr_ctl2 = vmx_msr_high | vmx_msr_low;
237 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
238 (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
239 set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
240 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
241 set_cpu_cap(c, X86_FEATURE_EPT);
242 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
243 set_cpu_cap(c, X86_FEATURE_VPID);
247 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
253 intel_workarounds(c);
255 l2 = init_intel_cacheinfo(c);
256 if (c->cpuid_level > 9) {
257 unsigned eax = cpuid_eax(10);
258 /* Check for version and the number of counters */
259 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
260 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
264 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
267 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
269 set_cpu_cap(c, X86_FEATURE_BTS);
271 set_cpu_cap(c, X86_FEATURE_PEBS);
277 c->x86_cache_alignment = c->x86_clflush_size * 2;
279 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
282 * Names for the Pentium II/Celeron processors
283 * detectable only by also checking the cache size.
284 * Dixon is NOT a Celeron.
289 switch (c->x86_model) {
291 if (c->x86_mask == 0) {
293 p = "Celeron (Covington)";
295 p = "Mobile Pentium II (Dixon)";
301 p = "Celeron (Mendocino)";
302 else if (c->x86_mask == 0 || c->x86_mask == 5)
308 p = "Celeron (Coppermine)";
313 strcpy(c->x86_model_id, p);
317 set_cpu_cap(c, X86_FEATURE_P4);
319 set_cpu_cap(c, X86_FEATURE_P3);
322 ptrace_bts_init_intel(c);
326 detect_extended_topology(c);
327 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
329 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
332 c->x86_max_cores = intel_num_cpu_cores(c);
338 /* Work around errata */
341 if (cpu_has(c, X86_FEATURE_VMX))
342 detect_vmx_virtcap(c);
346 static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
349 * Intel PIII Tualatin. This comes in two flavours.
350 * One has 256kb of cache, the other 512. We have no way
351 * to determine which, so we use a boottime override
352 * for the 512kb model, and assume 256 otherwise.
354 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
360 static struct cpu_dev intel_cpu_dev __cpuinitdata = {
362 .c_ident = { "GenuineIntel" },
365 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
367 [0] = "486 DX-25/33",
378 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
380 [0] = "Pentium 60/66 A-step",
381 [1] = "Pentium 60/66",
382 [2] = "Pentium 75 - 200",
383 [3] = "OverDrive PODP5V83",
385 [7] = "Mobile Pentium 75 - 200",
386 [8] = "Mobile Pentium MMX"
389 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
391 [0] = "Pentium Pro A-step",
393 [3] = "Pentium II (Klamath)",
394 [4] = "Pentium II (Deschutes)",
395 [5] = "Pentium II (Deschutes)",
396 [6] = "Mobile Pentium II",
397 [7] = "Pentium III (Katmai)",
398 [8] = "Pentium III (Coppermine)",
399 [10] = "Pentium III (Cascades)",
400 [11] = "Pentium III (Tualatin)",
403 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
405 [0] = "Pentium 4 (Unknown)",
406 [1] = "Pentium 4 (Willamette)",
407 [2] = "Pentium 4 (Northwood)",
408 [4] = "Pentium 4 (Foster)",
409 [5] = "Pentium 4 (Foster)",
413 .c_size_cache = intel_size_cache,
415 .c_early_init = early_init_intel,
416 .c_init = init_intel,
417 .c_x86_vendor = X86_VENDOR_INTEL,
420 cpu_dev_register(intel_cpu_dev);