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;
48 * Early probe support logic for ppro memory erratum #50
50 * This is called before we do cpu ident work
53 int __cpuinit ppro_with_ram_bug(void)
55 /* Uses data from early_cpu_detect now */
56 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
57 boot_cpu_data.x86 == 6 &&
58 boot_cpu_data.x86_model == 1 &&
59 boot_cpu_data.x86_mask < 8) {
60 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
68 * P4 Xeon errata 037 workaround.
69 * Hardware prefetcher may cause stale data to be loaded into the cache.
71 static void __cpuinit Intel_errata_workarounds(struct cpuinfo_x86 *c)
75 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
76 rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
77 if ((lo & (1<<9)) == 0) {
78 printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
79 printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
80 lo |= (1<<9); /* Disable hw prefetching */
81 wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
88 #ifdef CONFIG_X86_F00F_BUG
89 static void __cpuinit trap_init_f00f_bug(void)
91 __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
94 * Update the IDT descriptor and reload the IDT so that
95 * it uses the read-only mapped virtual address.
97 idt_descr.address = fix_to_virt(FIX_F00F_IDT);
103 static void __cpuinit srat_detect_node(void)
105 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
107 int cpu = smp_processor_id();
108 int apicid = hard_smp_processor_id();
110 /* Don't do the funky fallback heuristics the AMD version employs
112 node = apicid_to_node[apicid];
113 if (node == NUMA_NO_NODE || !node_online(node))
114 node = first_node(node_online_map);
115 numa_set_node(cpu, node);
117 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
122 * find out the number of processor cores on the die
124 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
126 unsigned int eax, ebx, ecx, edx;
128 if (c->cpuid_level < 4)
131 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
132 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
134 return ((eax >> 26) + 1);
139 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
146 #ifdef CONFIG_X86_F00F_BUG
148 * All current models of Pentium and Pentium with MMX technology CPUs
149 * have the F0 0F bug, which lets nonprivileged users lock up the system.
150 * Note that the workaround only should be initialized once...
153 if (!paravirt_enabled() && c->x86 == 5) {
154 static int f00f_workaround_enabled;
157 if (!f00f_workaround_enabled) {
158 trap_init_f00f_bug();
159 printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
160 f00f_workaround_enabled = 1;
165 l2 = init_intel_cacheinfo(c);
166 if (c->cpuid_level > 9) {
167 unsigned eax = cpuid_eax(10);
168 /* Check for version and the number of counters */
169 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
170 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
174 /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until model 3 mask 3 */
175 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
176 clear_cpu_cap(c, X86_FEATURE_SEP);
179 * Names for the Pentium II/Celeron processors
180 * detectable only by also checking the cache size.
181 * Dixon is NOT a Celeron.
184 switch (c->x86_model) {
186 if (c->x86_mask == 0) {
188 p = "Celeron (Covington)";
190 p = "Mobile Pentium II (Dixon)";
196 p = "Celeron (Mendocino)";
197 else if (c->x86_mask == 0 || c->x86_mask == 5)
203 p = "Celeron (Coppermine)";
209 strcpy(c->x86_model_id, p);
211 Intel_errata_workarounds(c);
213 #ifdef CONFIG_X86_INTEL_USERCOPY
215 * Set up the preferred alignment for movsl bulk memory moves
218 case 4: /* 486: untested */
220 case 5: /* Old Pentia: untested */
222 case 6: /* PII/PIII only like movsl with 8-byte alignment */
225 case 15: /* P4 is OK down to 8-byte alignment */
234 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
237 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
239 set_cpu_cap(c, X86_FEATURE_BTS);
241 set_cpu_cap(c, X86_FEATURE_PEBS);
247 c->x86_cache_alignment = c->x86_clflush_size * 2;
249 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
252 set_cpu_cap(c, X86_FEATURE_P4);
254 set_cpu_cap(c, X86_FEATURE_P3);
257 ptrace_bts_init_intel(c);
260 * See if we have a good local APIC by checking for buggy Pentia,
261 * i.e. all B steppings and the C2 stepping of P54C when using their
262 * integrated APIC (see 11AP erratum in "Pentium Processor
263 * Specification Update").
265 if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
266 (c->x86_mask < 0x6 || c->x86_mask == 0xb))
267 set_cpu_cap(c, X86_FEATURE_11AP);
269 #ifdef CONFIG_X86_NUMAQ
274 detect_extended_topology(c);
275 if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
277 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
280 c->x86_max_cores = intel_num_cpu_cores(c);
286 /* Work around errata */
291 static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
294 * Intel PIII Tualatin. This comes in two flavours.
295 * One has 256kb of cache, the other 512. We have no way
296 * to determine which, so we use a boottime override
297 * for the 512kb model, and assume 256 otherwise.
299 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
305 static struct cpu_dev intel_cpu_dev __cpuinitdata = {
307 .c_ident = { "GenuineIntel" },
310 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
312 [0] = "486 DX-25/33",
323 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
325 [0] = "Pentium 60/66 A-step",
326 [1] = "Pentium 60/66",
327 [2] = "Pentium 75 - 200",
328 [3] = "OverDrive PODP5V83",
330 [7] = "Mobile Pentium 75 - 200",
331 [8] = "Mobile Pentium MMX"
334 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
336 [0] = "Pentium Pro A-step",
338 [3] = "Pentium II (Klamath)",
339 [4] = "Pentium II (Deschutes)",
340 [5] = "Pentium II (Deschutes)",
341 [6] = "Mobile Pentium II",
342 [7] = "Pentium III (Katmai)",
343 [8] = "Pentium III (Coppermine)",
344 [10] = "Pentium III (Cascades)",
345 [11] = "Pentium III (Tualatin)",
348 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
350 [0] = "Pentium 4 (Unknown)",
351 [1] = "Pentium 4 (Willamette)",
352 [2] = "Pentium 4 (Northwood)",
353 [4] = "Pentium 4 (Foster)",
354 [5] = "Pentium 4 (Foster)",
358 .c_size_cache = intel_size_cache,
360 .c_early_init = early_init_intel,
361 .c_init = init_intel,
362 .c_x86_vendor = X86_VENDOR_INTEL,
365 cpu_dev_register(intel_cpu_dev);