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1da177e4 LT |
1 | #include <linux/init.h> |
2 | #include <linux/bitops.h> | |
3 | #include <linux/mm.h> | |
4 | #include <asm/io.h> | |
5 | #include <asm/processor.h> | |
d3f7eae1 | 6 | #include <asm/apic.h> |
c1e3619e | 7 | #include <asm/mach_apic.h> |
1da177e4 LT |
8 | |
9 | #include "cpu.h" | |
10 | ||
11 | /* | |
12 | * B step AMD K6 before B 9730xxxx have hardware bugs that can cause | |
13 | * misexecution of code under Linux. Owners of such processors should | |
14 | * contact AMD for precise details and a CPU swap. | |
15 | * | |
16 | * See http://www.multimania.com/poulot/k6bug.html | |
17 | * http://www.amd.com/K6/k6docs/revgd.html | |
18 | * | |
19 | * The following test is erm.. interesting. AMD neglected to up | |
20 | * the chip setting when fixing the bug but they also tweaked some | |
21 | * performance at the same time.. | |
22 | */ | |
23 | ||
24 | extern void vide(void); | |
25 | __asm__(".align 4\nvide: ret"); | |
26 | ||
d3f7eae1 | 27 | #ifdef CONFIG_X86_LOCAL_APIC |
3556ddfa AK |
28 | #define ENABLE_C1E_MASK 0x18000000 |
29 | #define CPUID_PROCESSOR_SIGNATURE 1 | |
30 | #define CPUID_XFAM 0x0ff00000 | |
31 | #define CPUID_XFAM_K8 0x00000000 | |
32 | #define CPUID_XFAM_10H 0x00100000 | |
33 | #define CPUID_XFAM_11H 0x00200000 | |
34 | #define CPUID_XMOD 0x000f0000 | |
35 | #define CPUID_XMOD_REV_F 0x00040000 | |
36 | ||
37 | /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */ | |
38 | static __cpuinit int amd_apic_timer_broken(void) | |
39 | { | |
40 | u32 lo, hi; | |
41 | u32 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE); | |
42 | switch (eax & CPUID_XFAM) { | |
43 | case CPUID_XFAM_K8: | |
44 | if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F) | |
45 | break; | |
46 | case CPUID_XFAM_10H: | |
47 | case CPUID_XFAM_11H: | |
48 | rdmsr(MSR_K8_ENABLE_C1E, lo, hi); | |
c1e3619e TG |
49 | if (lo & ENABLE_C1E_MASK) { |
50 | if (smp_processor_id() != boot_cpu_physical_apicid) | |
51 | printk(KERN_INFO "AMD C1E detected late. " | |
52 | " Force timer broadcast.\n"); | |
3556ddfa | 53 | return 1; |
c1e3619e TG |
54 | } |
55 | break; | |
56 | default: | |
57 | /* err on the side of caution */ | |
3556ddfa | 58 | return 1; |
c1e3619e | 59 | } |
3556ddfa AK |
60 | return 0; |
61 | } | |
d3f7eae1 | 62 | #endif |
3556ddfa | 63 | |
f039b754 AK |
64 | int force_mwait __cpuinitdata; |
65 | ||
2b16a235 AK |
66 | void __cpuinit early_init_amd(struct cpuinfo_x86 *c) |
67 | { | |
68 | if (cpuid_eax(0x80000000) >= 0x80000007) { | |
69 | c->x86_power = cpuid_edx(0x80000007); | |
70 | if (c->x86_power & (1<<8)) | |
71 | set_bit(X86_FEATURE_CONSTANT_TSC, c->x86_capability); | |
72 | } | |
73 | } | |
74 | ||
b4af3f7c | 75 | static void __cpuinit init_amd(struct cpuinfo_x86 *c) |
1da177e4 LT |
76 | { |
77 | u32 l, h; | |
78 | int mbytes = num_physpages >> (20-PAGE_SHIFT); | |
79 | int r; | |
80 | ||
7d318d77 | 81 | #ifdef CONFIG_SMP |
3c92c2ba | 82 | unsigned long long value; |
7d318d77 AK |
83 | |
84 | /* Disable TLB flush filter by setting HWCR.FFDIS on K8 | |
85 | * bit 6 of msr C001_0015 | |
86 | * | |
87 | * Errata 63 for SH-B3 steppings | |
88 | * Errata 122 for all steppings (F+ have it disabled by default) | |
89 | */ | |
90 | if (c->x86 == 15) { | |
91 | rdmsrl(MSR_K7_HWCR, value); | |
92 | value |= 1 << 6; | |
93 | wrmsrl(MSR_K7_HWCR, value); | |
94 | } | |
95 | #endif | |
96 | ||
2b16a235 AK |
97 | early_init_amd(c); |
98 | ||
1da177e4 LT |
99 | /* |
100 | * FIXME: We should handle the K5 here. Set up the write | |
101 | * range and also turn on MSR 83 bits 4 and 31 (write alloc, | |
102 | * no bus pipeline) | |
103 | */ | |
104 | ||
105 | /* Bit 31 in normal CPUID used for nonstandard 3DNow ID; | |
106 | 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */ | |
107 | clear_bit(0*32+31, c->x86_capability); | |
108 | ||
109 | r = get_model_name(c); | |
110 | ||
111 | switch(c->x86) | |
112 | { | |
113 | case 4: | |
114 | /* | |
115 | * General Systems BIOSen alias the cpu frequency registers | |
116 | * of the Elan at 0x000df000. Unfortuantly, one of the Linux | |
117 | * drivers subsequently pokes it, and changes the CPU speed. | |
118 | * Workaround : Remove the unneeded alias. | |
119 | */ | |
120 | #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */ | |
121 | #define CBAR_ENB (0x80000000) | |
122 | #define CBAR_KEY (0X000000CB) | |
123 | if (c->x86_model==9 || c->x86_model == 10) { | |
124 | if (inl (CBAR) & CBAR_ENB) | |
125 | outl (0 | CBAR_KEY, CBAR); | |
126 | } | |
127 | break; | |
128 | case 5: | |
129 | if( c->x86_model < 6 ) | |
130 | { | |
131 | /* Based on AMD doc 20734R - June 2000 */ | |
132 | if ( c->x86_model == 0 ) { | |
133 | clear_bit(X86_FEATURE_APIC, c->x86_capability); | |
134 | set_bit(X86_FEATURE_PGE, c->x86_capability); | |
135 | } | |
136 | break; | |
137 | } | |
138 | ||
139 | if ( c->x86_model == 6 && c->x86_mask == 1 ) { | |
140 | const int K6_BUG_LOOP = 1000000; | |
141 | int n; | |
142 | void (*f_vide)(void); | |
143 | unsigned long d, d2; | |
144 | ||
145 | printk(KERN_INFO "AMD K6 stepping B detected - "); | |
146 | ||
147 | /* | |
148 | * It looks like AMD fixed the 2.6.2 bug and improved indirect | |
149 | * calls at the same time. | |
150 | */ | |
151 | ||
152 | n = K6_BUG_LOOP; | |
153 | f_vide = vide; | |
154 | rdtscl(d); | |
155 | while (n--) | |
156 | f_vide(); | |
157 | rdtscl(d2); | |
158 | d = d2-d; | |
6df0532e | 159 | |
1da177e4 LT |
160 | if (d > 20*K6_BUG_LOOP) |
161 | printk("system stability may be impaired when more than 32 MB are used.\n"); | |
162 | else | |
163 | printk("probably OK (after B9730xxxx).\n"); | |
164 | printk(KERN_INFO "Please see http://membres.lycos.fr/poulot/k6bug.html\n"); | |
165 | } | |
166 | ||
167 | /* K6 with old style WHCR */ | |
168 | if (c->x86_model < 8 || | |
169 | (c->x86_model== 8 && c->x86_mask < 8)) { | |
170 | /* We can only write allocate on the low 508Mb */ | |
171 | if(mbytes>508) | |
172 | mbytes=508; | |
173 | ||
174 | rdmsr(MSR_K6_WHCR, l, h); | |
175 | if ((l&0x0000FFFF)==0) { | |
176 | unsigned long flags; | |
177 | l=(1<<0)|((mbytes/4)<<1); | |
178 | local_irq_save(flags); | |
179 | wbinvd(); | |
180 | wrmsr(MSR_K6_WHCR, l, h); | |
181 | local_irq_restore(flags); | |
182 | printk(KERN_INFO "Enabling old style K6 write allocation for %d Mb\n", | |
183 | mbytes); | |
184 | } | |
185 | break; | |
186 | } | |
187 | ||
188 | if ((c->x86_model == 8 && c->x86_mask >7) || | |
189 | c->x86_model == 9 || c->x86_model == 13) { | |
190 | /* The more serious chips .. */ | |
191 | ||
192 | if(mbytes>4092) | |
193 | mbytes=4092; | |
194 | ||
195 | rdmsr(MSR_K6_WHCR, l, h); | |
196 | if ((l&0xFFFF0000)==0) { | |
197 | unsigned long flags; | |
198 | l=((mbytes>>2)<<22)|(1<<16); | |
199 | local_irq_save(flags); | |
200 | wbinvd(); | |
201 | wrmsr(MSR_K6_WHCR, l, h); | |
202 | local_irq_restore(flags); | |
203 | printk(KERN_INFO "Enabling new style K6 write allocation for %d Mb\n", | |
204 | mbytes); | |
205 | } | |
206 | ||
207 | /* Set MTRR capability flag if appropriate */ | |
208 | if (c->x86_model == 13 || c->x86_model == 9 || | |
209 | (c->x86_model == 8 && c->x86_mask >= 8)) | |
210 | set_bit(X86_FEATURE_K6_MTRR, c->x86_capability); | |
211 | break; | |
212 | } | |
1da177e4 | 213 | |
f90b8116 JC |
214 | if (c->x86_model == 10) { |
215 | /* AMD Geode LX is model 10 */ | |
216 | /* placeholder for any needed mods */ | |
217 | break; | |
218 | } | |
219 | break; | |
1da177e4 LT |
220 | case 6: /* An Athlon/Duron */ |
221 | ||
222 | /* Bit 15 of Athlon specific MSR 15, needs to be 0 | |
223 | * to enable SSE on Palomino/Morgan/Barton CPU's. | |
224 | * If the BIOS didn't enable it already, enable it here. | |
225 | */ | |
226 | if (c->x86_model >= 6 && c->x86_model <= 10) { | |
227 | if (!cpu_has(c, X86_FEATURE_XMM)) { | |
228 | printk(KERN_INFO "Enabling disabled K7/SSE Support.\n"); | |
229 | rdmsr(MSR_K7_HWCR, l, h); | |
230 | l &= ~0x00008000; | |
231 | wrmsr(MSR_K7_HWCR, l, h); | |
232 | set_bit(X86_FEATURE_XMM, c->x86_capability); | |
233 | } | |
234 | } | |
235 | ||
236 | /* It's been determined by AMD that Athlons since model 8 stepping 1 | |
237 | * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx | |
238 | * As per AMD technical note 27212 0.2 | |
239 | */ | |
240 | if ((c->x86_model == 8 && c->x86_mask>=1) || (c->x86_model > 8)) { | |
241 | rdmsr(MSR_K7_CLK_CTL, l, h); | |
242 | if ((l & 0xfff00000) != 0x20000000) { | |
243 | printk ("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n", l, | |
244 | ((l & 0x000fffff)|0x20000000)); | |
245 | wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h); | |
246 | } | |
247 | } | |
248 | break; | |
249 | } | |
250 | ||
251 | switch (c->x86) { | |
252 | case 15: | |
398cf2ab AK |
253 | /* Use K8 tuning for Fam10h and Fam11h */ |
254 | case 0x10: | |
255 | case 0x11: | |
1da177e4 LT |
256 | set_bit(X86_FEATURE_K8, c->x86_capability); |
257 | break; | |
258 | case 6: | |
259 | set_bit(X86_FEATURE_K7, c->x86_capability); | |
260 | break; | |
261 | } | |
18bd057b AK |
262 | if (c->x86 >= 6) |
263 | set_bit(X86_FEATURE_FXSAVE_LEAK, c->x86_capability); | |
1da177e4 LT |
264 | |
265 | display_cacheinfo(c); | |
3dd9d514 AK |
266 | |
267 | if (cpuid_eax(0x80000000) >= 0x80000008) { | |
94605eff | 268 | c->x86_max_cores = (cpuid_ecx(0x80000008) & 0xff) + 1; |
3dd9d514 AK |
269 | } |
270 | ||
b41e2939 | 271 | #ifdef CONFIG_X86_HT |
63518644 | 272 | /* |
faee9a5d | 273 | * On a AMD multi core setup the lower bits of the APIC id |
27b46d76 | 274 | * distinguish the cores. |
63518644 | 275 | */ |
94605eff | 276 | if (c->x86_max_cores > 1) { |
a158608b | 277 | int cpu = smp_processor_id(); |
faee9a5d AK |
278 | unsigned bits = (cpuid_ecx(0x80000008) >> 12) & 0xf; |
279 | ||
280 | if (bits == 0) { | |
281 | while ((1 << bits) < c->x86_max_cores) | |
282 | bits++; | |
283 | } | |
4b89aff9 RS |
284 | c->cpu_core_id = c->phys_proc_id & ((1<<bits)-1); |
285 | c->phys_proc_id >>= bits; | |
63518644 | 286 | printk(KERN_INFO "CPU %d(%d) -> Core %d\n", |
4b89aff9 | 287 | cpu, c->x86_max_cores, c->cpu_core_id); |
63518644 | 288 | } |
1da177e4 | 289 | #endif |
39b3a791 | 290 | |
67cddd94 AK |
291 | if (cpuid_eax(0x80000000) >= 0x80000006) { |
292 | if ((c->x86 == 0x10) && (cpuid_edx(0x80000006) & 0xf000)) | |
293 | num_cache_leaves = 4; | |
294 | else | |
295 | num_cache_leaves = 3; | |
296 | } | |
3556ddfa | 297 | |
d3f7eae1 | 298 | #ifdef CONFIG_X86_LOCAL_APIC |
3556ddfa | 299 | if (amd_apic_timer_broken()) |
d3f7eae1 AK |
300 | local_apic_timer_disabled = 1; |
301 | #endif | |
f039b754 | 302 | |
c12ceb76 AK |
303 | /* K6s reports MCEs but don't actually have all the MSRs */ |
304 | if (c->x86 < 6) | |
305 | clear_bit(X86_FEATURE_MCE, c->x86_capability); | |
de421863 AK |
306 | |
307 | if (cpu_has_xmm) | |
308 | set_bit(X86_FEATURE_MFENCE_RDTSC, c->x86_capability); | |
1da177e4 LT |
309 | } |
310 | ||
e9dff0ee | 311 | static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 * c, unsigned int size) |
1da177e4 LT |
312 | { |
313 | /* AMD errata T13 (order #21922) */ | |
314 | if ((c->x86 == 6)) { | |
315 | if (c->x86_model == 3 && c->x86_mask == 0) /* Duron Rev A0 */ | |
316 | size = 64; | |
317 | if (c->x86_model == 4 && | |
318 | (c->x86_mask==0 || c->x86_mask==1)) /* Tbird rev A1/A2 */ | |
319 | size = 256; | |
320 | } | |
321 | return size; | |
322 | } | |
323 | ||
95414930 | 324 | static struct cpu_dev amd_cpu_dev __cpuinitdata = { |
1da177e4 LT |
325 | .c_vendor = "AMD", |
326 | .c_ident = { "AuthenticAMD" }, | |
327 | .c_models = { | |
328 | { .vendor = X86_VENDOR_AMD, .family = 4, .model_names = | |
329 | { | |
330 | [3] = "486 DX/2", | |
331 | [7] = "486 DX/2-WB", | |
332 | [8] = "486 DX/4", | |
333 | [9] = "486 DX/4-WB", | |
334 | [14] = "Am5x86-WT", | |
335 | [15] = "Am5x86-WB" | |
336 | } | |
337 | }, | |
338 | }, | |
339 | .c_init = init_amd, | |
1da177e4 LT |
340 | .c_size_cache = amd_size_cache, |
341 | }; | |
342 | ||
343 | int __init amd_init_cpu(void) | |
344 | { | |
345 | cpu_devs[X86_VENDOR_AMD] = &amd_cpu_dev; | |
346 | return 0; | |
347 | } |