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-rw-r--r--arch/x86/kernel/cpu/intel.c333
1 files changed, 333 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
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1#include <linux/init.h>
2#include <linux/kernel.h>
3
4#include <linux/string.h>
5#include <linux/bitops.h>
6#include <linux/smp.h>
7#include <linux/thread_info.h>
8#include <linux/module.h>
9
10#include <asm/processor.h>
11#include <asm/msr.h>
12#include <asm/uaccess.h>
13
14#include "cpu.h"
15
16#ifdef CONFIG_X86_LOCAL_APIC
17#include <asm/mpspec.h>
18#include <asm/apic.h>
19#include <mach_apic.h>
20#endif
21
22extern int trap_init_f00f_bug(void);
23
24#ifdef CONFIG_X86_INTEL_USERCOPY
25/*
26 * Alignment at which movsl is preferred for bulk memory copies.
27 */
28struct movsl_mask movsl_mask __read_mostly;
29#endif
30
31void __cpuinit early_intel_workaround(struct cpuinfo_x86 *c)
32{
33 if (c->x86_vendor != X86_VENDOR_INTEL)
34 return;
35 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
36 if (c->x86 == 15 && c->x86_cache_alignment == 64)
37 c->x86_cache_alignment = 128;
38}
39
40/*
41 * Early probe support logic for ppro memory erratum #50
42 *
43 * This is called before we do cpu ident work
44 */
45
46int __cpuinit ppro_with_ram_bug(void)
47{
48 /* Uses data from early_cpu_detect now */
49 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
50 boot_cpu_data.x86 == 6 &&
51 boot_cpu_data.x86_model == 1 &&
52 boot_cpu_data.x86_mask < 8) {
53 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
54 return 1;
55 }
56 return 0;
57}
58
59
60/*
61 * P4 Xeon errata 037 workaround.
62 * Hardware prefetcher may cause stale data to be loaded into the cache.
63 */
64static void __cpuinit Intel_errata_workarounds(struct cpuinfo_x86 *c)
65{
66 unsigned long lo, hi;
67
68 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
69 rdmsr (MSR_IA32_MISC_ENABLE, lo, hi);
70 if ((lo & (1<<9)) == 0) {
71 printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
72 printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
73 lo |= (1<<9); /* Disable hw prefetching */
74 wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
75 }
76 }
77}
78
79
80/*
81 * find out the number of processor cores on the die
82 */
83static int __cpuinit num_cpu_cores(struct cpuinfo_x86 *c)
84{
85 unsigned int eax, ebx, ecx, edx;
86
87 if (c->cpuid_level < 4)
88 return 1;
89
90 /* Intel has a non-standard dependency on %ecx for this CPUID level. */
91 cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
92 if (eax & 0x1f)
93 return ((eax >> 26) + 1);
94 else
95 return 1;
96}
97
98static void __cpuinit init_intel(struct cpuinfo_x86 *c)
99{
100 unsigned int l2 = 0;
101 char *p = NULL;
102
103#ifdef CONFIG_X86_F00F_BUG
104 /*
105 * All current models of Pentium and Pentium with MMX technology CPUs
106 * have the F0 0F bug, which lets nonprivileged users lock up the system.
107 * Note that the workaround only should be initialized once...
108 */
109 c->f00f_bug = 0;
110 if (!paravirt_enabled() && c->x86 == 5) {
111 static int f00f_workaround_enabled = 0;
112
113 c->f00f_bug = 1;
114 if ( !f00f_workaround_enabled ) {
115 trap_init_f00f_bug();
116 printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
117 f00f_workaround_enabled = 1;
118 }
119 }
120#endif
121
122 select_idle_routine(c);
123 l2 = init_intel_cacheinfo(c);
124 if (c->cpuid_level > 9 ) {
125 unsigned eax = cpuid_eax(10);
126 /* Check for version and the number of counters */
127 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
128 set_bit(X86_FEATURE_ARCH_PERFMON, c->x86_capability);
129 }
130
131 /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until model 3 mask 3 */
132 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
133 clear_bit(X86_FEATURE_SEP, c->x86_capability);
134
135 /* Names for the Pentium II/Celeron processors
136 detectable only by also checking the cache size.
137 Dixon is NOT a Celeron. */
138 if (c->x86 == 6) {
139 switch (c->x86_model) {
140 case 5:
141 if (c->x86_mask == 0) {
142 if (l2 == 0)
143 p = "Celeron (Covington)";
144 else if (l2 == 256)
145 p = "Mobile Pentium II (Dixon)";
146 }
147 break;
148
149 case 6:
150 if (l2 == 128)
151 p = "Celeron (Mendocino)";
152 else if (c->x86_mask == 0 || c->x86_mask == 5)
153 p = "Celeron-A";
154 break;
155
156 case 8:
157 if (l2 == 128)
158 p = "Celeron (Coppermine)";
159 break;
160 }
161 }
162
163 if ( p )
164 strcpy(c->x86_model_id, p);
165
166 c->x86_max_cores = num_cpu_cores(c);
167
168 detect_ht(c);
169
170 /* Work around errata */
171 Intel_errata_workarounds(c);
172
173#ifdef CONFIG_X86_INTEL_USERCOPY
174 /*
175 * Set up the preferred alignment for movsl bulk memory moves
176 */
177 switch (c->x86) {
178 case 4: /* 486: untested */
179 break;
180 case 5: /* Old Pentia: untested */
181 break;
182 case 6: /* PII/PIII only like movsl with 8-byte alignment */
183 movsl_mask.mask = 7;
184 break;
185 case 15: /* P4 is OK down to 8-byte alignment */
186 movsl_mask.mask = 7;
187 break;
188 }
189#endif
190
191 if (c->x86 == 15) {
192 set_bit(X86_FEATURE_P4, c->x86_capability);
193 set_bit(X86_FEATURE_SYNC_RDTSC, c->x86_capability);
194 }
195 if (c->x86 == 6)
196 set_bit(X86_FEATURE_P3, c->x86_capability);
197 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
198 (c->x86 == 0x6 && c->x86_model >= 0x0e))
199 set_bit(X86_FEATURE_CONSTANT_TSC, c->x86_capability);
200
201 if (cpu_has_ds) {
202 unsigned int l1;
203 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
204 if (!(l1 & (1<<11)))
205 set_bit(X86_FEATURE_BTS, c->x86_capability);
206 if (!(l1 & (1<<12)))
207 set_bit(X86_FEATURE_PEBS, c->x86_capability);
208 }
209}
210
211static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 * c, unsigned int size)
212{
213 /* Intel PIII Tualatin. This comes in two flavours.
214 * One has 256kb of cache, the other 512. We have no way
215 * to determine which, so we use a boottime override
216 * for the 512kb model, and assume 256 otherwise.
217 */
218 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
219 size = 256;
220 return size;
221}
222
223static struct cpu_dev intel_cpu_dev __cpuinitdata = {
224 .c_vendor = "Intel",
225 .c_ident = { "GenuineIntel" },
226 .c_models = {
227 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
228 {
229 [0] = "486 DX-25/33",
230 [1] = "486 DX-50",
231 [2] = "486 SX",
232 [3] = "486 DX/2",
233 [4] = "486 SL",
234 [5] = "486 SX/2",
235 [7] = "486 DX/2-WB",
236 [8] = "486 DX/4",
237 [9] = "486 DX/4-WB"
238 }
239 },
240 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
241 {
242 [0] = "Pentium 60/66 A-step",
243 [1] = "Pentium 60/66",
244 [2] = "Pentium 75 - 200",
245 [3] = "OverDrive PODP5V83",
246 [4] = "Pentium MMX",
247 [7] = "Mobile Pentium 75 - 200",
248 [8] = "Mobile Pentium MMX"
249 }
250 },
251 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
252 {
253 [0] = "Pentium Pro A-step",
254 [1] = "Pentium Pro",
255 [3] = "Pentium II (Klamath)",
256 [4] = "Pentium II (Deschutes)",
257 [5] = "Pentium II (Deschutes)",
258 [6] = "Mobile Pentium II",
259 [7] = "Pentium III (Katmai)",
260 [8] = "Pentium III (Coppermine)",
261 [10] = "Pentium III (Cascades)",
262 [11] = "Pentium III (Tualatin)",
263 }
264 },
265 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
266 {
267 [0] = "Pentium 4 (Unknown)",
268 [1] = "Pentium 4 (Willamette)",
269 [2] = "Pentium 4 (Northwood)",
270 [4] = "Pentium 4 (Foster)",
271 [5] = "Pentium 4 (Foster)",
272 }
273 },
274 },
275 .c_init = init_intel,
276 .c_size_cache = intel_size_cache,
277};
278
279__init int intel_cpu_init(void)
280{
281 cpu_devs[X86_VENDOR_INTEL] = &intel_cpu_dev;
282 return 0;
283}
284
285#ifndef CONFIG_X86_CMPXCHG
286unsigned long cmpxchg_386_u8(volatile void *ptr, u8 old, u8 new)
287{
288 u8 prev;
289 unsigned long flags;
290
291 /* Poor man's cmpxchg for 386. Unsuitable for SMP */
292 local_irq_save(flags);
293 prev = *(u8 *)ptr;
294 if (prev == old)
295 *(u8 *)ptr = new;
296 local_irq_restore(flags);
297 return prev;
298}
299EXPORT_SYMBOL(cmpxchg_386_u8);
300
301unsigned long cmpxchg_386_u16(volatile void *ptr, u16 old, u16 new)
302{
303 u16 prev;
304 unsigned long flags;
305
306 /* Poor man's cmpxchg for 386. Unsuitable for SMP */
307 local_irq_save(flags);
308 prev = *(u16 *)ptr;
309 if (prev == old)
310 *(u16 *)ptr = new;
311 local_irq_restore(flags);
312 return prev;
313}
314EXPORT_SYMBOL(cmpxchg_386_u16);
315
316unsigned long cmpxchg_386_u32(volatile void *ptr, u32 old, u32 new)
317{
318 u32 prev;
319 unsigned long flags;
320
321 /* Poor man's cmpxchg for 386. Unsuitable for SMP */
322 local_irq_save(flags);
323 prev = *(u32 *)ptr;
324 if (prev == old)
325 *(u32 *)ptr = new;
326 local_irq_restore(flags);
327 return prev;
328}
329EXPORT_SYMBOL(cmpxchg_386_u32);
330#endif
331
332// arch_initcall(intel_cpu_init);
333