1 #include <linux/init.h>
2 #include <linux/bitops.h>
6 #include <asm/processor.h>
10 # include <asm/numa_64.h>
11 # include <asm/mmconfig.h>
12 # include <asm/cacheflush.h>
15 #include <mach_apic.h>
21 * B step AMD K6 before B 9730xxxx have hardware bugs that can cause
22 * misexecution of code under Linux. Owners of such processors should
23 * contact AMD for precise details and a CPU swap.
25 * See http://www.multimania.com/poulot/k6bug.html
26 * http://www.amd.com/K6/k6docs/revgd.html
28 * The following test is erm.. interesting. AMD neglected to up
29 * the chip setting when fixing the bug but they also tweaked some
30 * performance at the same time..
33 extern void vide(void);
34 __asm__(".align 4\nvide: ret");
36 static void __cpuinit init_amd_k5(struct cpuinfo_x86 *c)
39 * General Systems BIOSen alias the cpu frequency registers
40 * of the Elan at 0x000df000. Unfortuantly, one of the Linux
41 * drivers subsequently pokes it, and changes the CPU speed.
42 * Workaround : Remove the unneeded alias.
44 #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */
45 #define CBAR_ENB (0x80000000)
46 #define CBAR_KEY (0X000000CB)
47 if (c->x86_model == 9 || c->x86_model == 10) {
48 if (inl (CBAR) & CBAR_ENB)
49 outl (0 | CBAR_KEY, CBAR);
54 static void __cpuinit init_amd_k6(struct cpuinfo_x86 *c)
57 int mbytes = num_physpages >> (20-PAGE_SHIFT);
59 if (c->x86_model < 6) {
60 /* Based on AMD doc 20734R - June 2000 */
61 if (c->x86_model == 0) {
62 clear_cpu_cap(c, X86_FEATURE_APIC);
63 set_cpu_cap(c, X86_FEATURE_PGE);
68 if (c->x86_model == 6 && c->x86_mask == 1) {
69 const int K6_BUG_LOOP = 1000000;
74 printk(KERN_INFO "AMD K6 stepping B detected - ");
77 * It looks like AMD fixed the 2.6.2 bug and improved indirect
78 * calls at the same time.
89 if (d > 20*K6_BUG_LOOP)
90 printk("system stability may be impaired when more than 32 MB are used.\n");
92 printk("probably OK (after B9730xxxx).\n");
93 printk(KERN_INFO "Please see http://membres.lycos.fr/poulot/k6bug.html\n");
96 /* K6 with old style WHCR */
97 if (c->x86_model < 8 ||
98 (c->x86_model == 8 && c->x86_mask < 8)) {
99 /* We can only write allocate on the low 508Mb */
103 rdmsr(MSR_K6_WHCR, l, h);
104 if ((l&0x0000FFFF) == 0) {
106 l = (1<<0)|((mbytes/4)<<1);
107 local_irq_save(flags);
109 wrmsr(MSR_K6_WHCR, l, h);
110 local_irq_restore(flags);
111 printk(KERN_INFO "Enabling old style K6 write allocation for %d Mb\n",
117 if ((c->x86_model == 8 && c->x86_mask > 7) ||
118 c->x86_model == 9 || c->x86_model == 13) {
119 /* The more serious chips .. */
124 rdmsr(MSR_K6_WHCR, l, h);
125 if ((l&0xFFFF0000) == 0) {
127 l = ((mbytes>>2)<<22)|(1<<16);
128 local_irq_save(flags);
130 wrmsr(MSR_K6_WHCR, l, h);
131 local_irq_restore(flags);
132 printk(KERN_INFO "Enabling new style K6 write allocation for %d Mb\n",
139 if (c->x86_model == 10) {
140 /* AMD Geode LX is model 10 */
141 /* placeholder for any needed mods */
146 static void __cpuinit init_amd_k7(struct cpuinfo_x86 *c)
151 * Bit 15 of Athlon specific MSR 15, needs to be 0
152 * to enable SSE on Palomino/Morgan/Barton CPU's.
153 * If the BIOS didn't enable it already, enable it here.
155 if (c->x86_model >= 6 && c->x86_model <= 10) {
156 if (!cpu_has(c, X86_FEATURE_XMM)) {
157 printk(KERN_INFO "Enabling disabled K7/SSE Support.\n");
158 rdmsr(MSR_K7_HWCR, l, h);
160 wrmsr(MSR_K7_HWCR, l, h);
161 set_cpu_cap(c, X86_FEATURE_XMM);
166 * It's been determined by AMD that Athlons since model 8 stepping 1
167 * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx
168 * As per AMD technical note 27212 0.2
170 if ((c->x86_model == 8 && c->x86_mask >= 1) || (c->x86_model > 8)) {
171 rdmsr(MSR_K7_CLK_CTL, l, h);
172 if ((l & 0xfff00000) != 0x20000000) {
173 printk ("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n", l,
174 ((l & 0x000fffff)|0x20000000));
175 wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h);
179 set_cpu_cap(c, X86_FEATURE_K7);
183 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
184 static int __cpuinit nearby_node(int apicid)
188 for (i = apicid - 1; i >= 0; i--) {
189 node = apicid_to_node[i];
190 if (node != NUMA_NO_NODE && node_online(node))
193 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
194 node = apicid_to_node[i];
195 if (node != NUMA_NO_NODE && node_online(node))
198 return first_node(node_online_map); /* Shouldn't happen */
203 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
204 * Assumes number of cores is a power of two.
206 static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
211 bits = c->x86_coreid_bits;
213 /* Low order bits define the core id (index of core in socket) */
214 c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
215 /* Convert the initial APIC ID into the socket ID */
216 c->phys_proc_id = c->initial_apicid >> bits;
220 static void __cpuinit srat_detect_node(struct cpuinfo_x86 *c)
222 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
223 int cpu = smp_processor_id();
225 unsigned apicid = hard_smp_processor_id();
227 node = c->phys_proc_id;
228 if (apicid_to_node[apicid] != NUMA_NO_NODE)
229 node = apicid_to_node[apicid];
230 if (!node_online(node)) {
231 /* Two possibilities here:
232 - The CPU is missing memory and no node was created.
233 In that case try picking one from a nearby CPU
234 - The APIC IDs differ from the HyperTransport node IDs
235 which the K8 northbridge parsing fills in.
236 Assume they are all increased by a constant offset,
237 but in the same order as the HT nodeids.
238 If that doesn't result in a usable node fall back to the
239 path for the previous case. */
241 int ht_nodeid = c->initial_apicid;
243 if (ht_nodeid >= 0 &&
244 apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
245 node = apicid_to_node[ht_nodeid];
246 /* Pick a nearby node */
247 if (!node_online(node))
248 node = nearby_node(apicid);
250 numa_set_node(cpu, node);
252 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
256 static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
261 /* Multi core CPU? */
262 if (c->extended_cpuid_level < 0x80000008)
265 ecx = cpuid_ecx(0x80000008);
267 c->x86_max_cores = (ecx & 0xff) + 1;
269 /* CPU telling us the core id bits shift? */
270 bits = (ecx >> 12) & 0xF;
272 /* Otherwise recompute */
274 while ((1 << bits) < c->x86_max_cores)
278 c->x86_coreid_bits = bits;
282 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
284 early_init_amd_mc(c);
286 /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
287 if (c->x86_power & (1<<8))
288 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
291 set_cpu_cap(c, X86_FEATURE_SYSCALL32);
293 /* Set MTRR capability flag if appropriate */
295 if (c->x86_model == 13 || c->x86_model == 9 ||
296 (c->x86_model == 8 && c->x86_mask >= 8))
297 set_cpu_cap(c, X86_FEATURE_K6_MTRR);
301 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
304 unsigned long long value;
307 * Disable TLB flush filter by setting HWCR.FFDIS on K8
308 * bit 6 of msr C001_0015
310 * Errata 63 for SH-B3 steppings
311 * Errata 122 for all steppings (F+ have it disabled by default)
314 rdmsrl(MSR_K7_HWCR, value);
316 wrmsrl(MSR_K7_HWCR, value);
323 * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
324 * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
326 clear_cpu_cap(c, 0*32+31);
329 /* On C+ stepping K8 rep microcode works well for copy/memset */
333 level = cpuid_eax(1);
334 if((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
335 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
337 if (c->x86 == 0x10 || c->x86 == 0x11)
338 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
342 * FIXME: We should handle the K5 here. Set up the write
343 * range and also turn on MSR 83 bits 4 and 31 (write alloc,
354 case 6: /* An Athlon/Duron */
359 /* K6s reports MCEs but don't actually have all the MSRs */
361 clear_cpu_cap(c, X86_FEATURE_MCE);
364 /* Enable workaround for FXSAVE leak */
366 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
368 if (!c->x86_model_id[0]) {
371 /* Should distinguish Models here, but this is only
372 a fallback anyways. */
373 strcpy(c->x86_model_id, "Hammer");
378 display_cacheinfo(c);
380 /* Multi core CPU? */
381 if (c->extended_cpuid_level >= 0x80000008) {
390 if (c->extended_cpuid_level >= 0x80000006) {
391 if ((c->x86 >= 0x0f) && (cpuid_edx(0x80000006) & 0xf000))
392 num_cache_leaves = 4;
394 num_cache_leaves = 3;
397 if (c->x86 >= 0xf && c->x86 <= 0x11)
398 set_cpu_cap(c, X86_FEATURE_K8);
401 /* MFENCE stops RDTSC speculation */
402 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
406 if (c->x86 == 0x10) {
407 /* do this for boot cpu */
408 if (c == &boot_cpu_data)
409 check_enable_amd_mmconf_dmi();
411 fam10h_check_enable_mmcfg();
414 if (c == &boot_cpu_data && c->x86 >= 0xf && c->x86 <= 0x11) {
415 unsigned long long tseg;
418 * Split up direct mapping around the TSEG SMM area.
419 * Don't do it for gbpages because there seems very little
420 * benefit in doing so.
422 if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, &tseg)) {
423 printk(KERN_DEBUG "tseg: %010llx\n", tseg);
424 if ((tseg>>PMD_SHIFT) <
425 (max_low_pfn_mapped>>(PMD_SHIFT-PAGE_SHIFT)) ||
427 (max_pfn_mapped>>(PMD_SHIFT-PAGE_SHIFT)) &&
428 (tseg>>PMD_SHIFT) >= (1ULL<<(32 - PMD_SHIFT))))
429 set_memory_4k((unsigned long)__va(tseg), 1);
436 static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
438 /* AMD errata T13 (order #21922) */
440 if (c->x86_model == 3 && c->x86_mask == 0) /* Duron Rev A0 */
442 if (c->x86_model == 4 &&
443 (c->x86_mask == 0 || c->x86_mask == 1)) /* Tbird rev A1/A2 */
450 static struct cpu_dev amd_cpu_dev __cpuinitdata = {
452 .c_ident = { "AuthenticAMD" },
455 { .vendor = X86_VENDOR_AMD, .family = 4, .model_names =
466 .c_size_cache = amd_size_cache,
468 .c_early_init = early_init_amd,
470 .c_x86_vendor = X86_VENDOR_AMD,
473 cpu_dev_register(amd_cpu_dev);