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1da177e4 LT |
1 | #include <linux/config.h> |
2 | #include <linux/init.h> | |
3 | #include <linux/kernel.h> | |
4 | ||
5 | #include <linux/string.h> | |
6 | #include <linux/bitops.h> | |
7 | #include <linux/smp.h> | |
8 | #include <linux/thread_info.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 | ||
22 | extern 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 | */ | |
6c036527 | 28 | struct movsl_mask movsl_mask __read_mostly; |
1da177e4 LT |
29 | #endif |
30 | ||
0bb3184d | 31 | void __devinit early_intel_workaround(struct cpuinfo_x86 *c) |
1da177e4 LT |
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 | ||
0bb3184d | 46 | int __devinit ppro_with_ram_bug(void) |
1da177e4 LT |
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 | */ | |
0bb3184d | 64 | static void __devinit Intel_errata_workarounds(struct cpuinfo_x86 *c) |
1da177e4 LT |
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 | ||
3dd9d514 AK |
80 | /* |
81 | * find out the number of processor cores on the die | |
82 | */ | |
0bb3184d | 83 | static int __devinit num_cpu_cores(struct cpuinfo_x86 *c) |
3dd9d514 AK |
84 | { |
85 | unsigned int eax; | |
86 | ||
87 | if (c->cpuid_level < 4) | |
88 | return 1; | |
89 | ||
90 | __asm__("cpuid" | |
91 | : "=a" (eax) | |
92 | : "0" (4), "c" (0) | |
93 | : "bx", "dx"); | |
94 | ||
95 | if (eax & 0x1f) | |
96 | return ((eax >> 26) + 1); | |
97 | else | |
98 | return 1; | |
99 | } | |
100 | ||
0bb3184d | 101 | static void __devinit init_intel(struct cpuinfo_x86 *c) |
1da177e4 LT |
102 | { |
103 | unsigned int l2 = 0; | |
104 | char *p = NULL; | |
105 | ||
106 | #ifdef CONFIG_X86_F00F_BUG | |
107 | /* | |
108 | * All current models of Pentium and Pentium with MMX technology CPUs | |
109 | * have the F0 0F bug, which lets nonprivileged users lock up the system. | |
110 | * Note that the workaround only should be initialized once... | |
111 | */ | |
112 | c->f00f_bug = 0; | |
113 | if ( c->x86 == 5 ) { | |
114 | static int f00f_workaround_enabled = 0; | |
115 | ||
116 | c->f00f_bug = 1; | |
117 | if ( !f00f_workaround_enabled ) { | |
118 | trap_init_f00f_bug(); | |
119 | printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n"); | |
120 | f00f_workaround_enabled = 1; | |
121 | } | |
122 | } | |
123 | #endif | |
124 | ||
125 | select_idle_routine(c); | |
126 | l2 = init_intel_cacheinfo(c); | |
127 | ||
128 | /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until model 3 mask 3 */ | |
129 | if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633) | |
130 | clear_bit(X86_FEATURE_SEP, c->x86_capability); | |
131 | ||
132 | /* Names for the Pentium II/Celeron processors | |
133 | detectable only by also checking the cache size. | |
134 | Dixon is NOT a Celeron. */ | |
135 | if (c->x86 == 6) { | |
136 | switch (c->x86_model) { | |
137 | case 5: | |
138 | if (c->x86_mask == 0) { | |
139 | if (l2 == 0) | |
140 | p = "Celeron (Covington)"; | |
141 | else if (l2 == 256) | |
142 | p = "Mobile Pentium II (Dixon)"; | |
143 | } | |
144 | break; | |
145 | ||
146 | case 6: | |
147 | if (l2 == 128) | |
148 | p = "Celeron (Mendocino)"; | |
149 | else if (c->x86_mask == 0 || c->x86_mask == 5) | |
150 | p = "Celeron-A"; | |
151 | break; | |
152 | ||
153 | case 8: | |
154 | if (l2 == 128) | |
155 | p = "Celeron (Coppermine)"; | |
156 | break; | |
157 | } | |
158 | } | |
159 | ||
160 | if ( p ) | |
161 | strcpy(c->x86_model_id, p); | |
162 | ||
3dd9d514 AK |
163 | c->x86_num_cores = num_cpu_cores(c); |
164 | ||
1da177e4 LT |
165 | detect_ht(c); |
166 | ||
167 | /* Work around errata */ | |
168 | Intel_errata_workarounds(c); | |
169 | ||
170 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
171 | /* | |
172 | * Set up the preferred alignment for movsl bulk memory moves | |
173 | */ | |
174 | switch (c->x86) { | |
175 | case 4: /* 486: untested */ | |
176 | break; | |
177 | case 5: /* Old Pentia: untested */ | |
178 | break; | |
179 | case 6: /* PII/PIII only like movsl with 8-byte alignment */ | |
180 | movsl_mask.mask = 7; | |
181 | break; | |
182 | case 15: /* P4 is OK down to 8-byte alignment */ | |
183 | movsl_mask.mask = 7; | |
184 | break; | |
185 | } | |
186 | #endif | |
187 | ||
188 | if (c->x86 == 15) | |
189 | set_bit(X86_FEATURE_P4, c->x86_capability); | |
190 | if (c->x86 == 6) | |
191 | set_bit(X86_FEATURE_P3, c->x86_capability); | |
192 | } | |
193 | ||
194 | ||
195 | static unsigned int intel_size_cache(struct cpuinfo_x86 * c, unsigned int size) | |
196 | { | |
197 | /* Intel PIII Tualatin. This comes in two flavours. | |
198 | * One has 256kb of cache, the other 512. We have no way | |
199 | * to determine which, so we use a boottime override | |
200 | * for the 512kb model, and assume 256 otherwise. | |
201 | */ | |
202 | if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0)) | |
203 | size = 256; | |
204 | return size; | |
205 | } | |
206 | ||
0bb3184d | 207 | static struct cpu_dev intel_cpu_dev __devinitdata = { |
1da177e4 LT |
208 | .c_vendor = "Intel", |
209 | .c_ident = { "GenuineIntel" }, | |
210 | .c_models = { | |
211 | { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names = | |
212 | { | |
213 | [0] = "486 DX-25/33", | |
214 | [1] = "486 DX-50", | |
215 | [2] = "486 SX", | |
216 | [3] = "486 DX/2", | |
217 | [4] = "486 SL", | |
218 | [5] = "486 SX/2", | |
219 | [7] = "486 DX/2-WB", | |
220 | [8] = "486 DX/4", | |
221 | [9] = "486 DX/4-WB" | |
222 | } | |
223 | }, | |
224 | { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names = | |
225 | { | |
226 | [0] = "Pentium 60/66 A-step", | |
227 | [1] = "Pentium 60/66", | |
228 | [2] = "Pentium 75 - 200", | |
229 | [3] = "OverDrive PODP5V83", | |
230 | [4] = "Pentium MMX", | |
231 | [7] = "Mobile Pentium 75 - 200", | |
232 | [8] = "Mobile Pentium MMX" | |
233 | } | |
234 | }, | |
235 | { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names = | |
236 | { | |
237 | [0] = "Pentium Pro A-step", | |
238 | [1] = "Pentium Pro", | |
239 | [3] = "Pentium II (Klamath)", | |
240 | [4] = "Pentium II (Deschutes)", | |
241 | [5] = "Pentium II (Deschutes)", | |
242 | [6] = "Mobile Pentium II", | |
243 | [7] = "Pentium III (Katmai)", | |
244 | [8] = "Pentium III (Coppermine)", | |
245 | [10] = "Pentium III (Cascades)", | |
246 | [11] = "Pentium III (Tualatin)", | |
247 | } | |
248 | }, | |
249 | { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names = | |
250 | { | |
251 | [0] = "Pentium 4 (Unknown)", | |
252 | [1] = "Pentium 4 (Willamette)", | |
253 | [2] = "Pentium 4 (Northwood)", | |
254 | [4] = "Pentium 4 (Foster)", | |
255 | [5] = "Pentium 4 (Foster)", | |
256 | } | |
257 | }, | |
258 | }, | |
259 | .c_init = init_intel, | |
260 | .c_identify = generic_identify, | |
261 | .c_size_cache = intel_size_cache, | |
262 | }; | |
263 | ||
264 | __init int intel_cpu_init(void) | |
265 | { | |
266 | cpu_devs[X86_VENDOR_INTEL] = &intel_cpu_dev; | |
267 | return 0; | |
268 | } | |
269 | ||
270 | // arch_initcall(intel_cpu_init); | |
271 |