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
)
210 int cpu
= smp_processor_id();
212 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
;
217 /* use socket ID also for last level cache */
218 per_cpu(cpu_llc_id
, cpu
) = c
->phys_proc_id
;
222 static void __cpuinit
srat_detect_node(struct cpuinfo_x86
*c
)
224 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
225 int cpu
= smp_processor_id();
227 unsigned apicid
= hard_smp_processor_id();
229 node
= c
->phys_proc_id
;
230 if (apicid_to_node
[apicid
] != NUMA_NO_NODE
)
231 node
= apicid_to_node
[apicid
];
232 if (!node_online(node
)) {
233 /* Two possibilities here:
234 - The CPU is missing memory and no node was created.
235 In that case try picking one from a nearby CPU
236 - The APIC IDs differ from the HyperTransport node IDs
237 which the K8 northbridge parsing fills in.
238 Assume they are all increased by a constant offset,
239 but in the same order as the HT nodeids.
240 If that doesn't result in a usable node fall back to the
241 path for the previous case. */
243 int ht_nodeid
= c
->initial_apicid
;
245 if (ht_nodeid
>= 0 &&
246 apicid_to_node
[ht_nodeid
] != NUMA_NO_NODE
)
247 node
= apicid_to_node
[ht_nodeid
];
248 /* Pick a nearby node */
249 if (!node_online(node
))
250 node
= nearby_node(apicid
);
252 numa_set_node(cpu
, node
);
254 printk(KERN_INFO
"CPU %d/0x%x -> Node %d\n", cpu
, apicid
, node
);
258 static void __cpuinit
early_init_amd_mc(struct cpuinfo_x86
*c
)
263 /* Multi core CPU? */
264 if (c
->extended_cpuid_level
< 0x80000008)
267 ecx
= cpuid_ecx(0x80000008);
269 c
->x86_max_cores
= (ecx
& 0xff) + 1;
271 /* CPU telling us the core id bits shift? */
272 bits
= (ecx
>> 12) & 0xF;
274 /* Otherwise recompute */
276 while ((1 << bits
) < c
->x86_max_cores
)
280 c
->x86_coreid_bits
= bits
;
284 static void __cpuinit
early_init_amd(struct cpuinfo_x86
*c
)
286 early_init_amd_mc(c
);
289 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
290 * with P/T states and does not stop in deep C-states
292 if (c
->x86_power
& (1 << 8)) {
293 set_cpu_cap(c
, X86_FEATURE_CONSTANT_TSC
);
294 set_cpu_cap(c
, X86_FEATURE_NONSTOP_TSC
);
298 set_cpu_cap(c
, X86_FEATURE_SYSCALL32
);
300 /* Set MTRR capability flag if appropriate */
302 if (c
->x86_model
== 13 || c
->x86_model
== 9 ||
303 (c
->x86_model
== 8 && c
->x86_mask
>= 8))
304 set_cpu_cap(c
, X86_FEATURE_K6_MTRR
);
308 static void __cpuinit
init_amd(struct cpuinfo_x86
*c
)
311 unsigned long long value
;
314 * Disable TLB flush filter by setting HWCR.FFDIS on K8
315 * bit 6 of msr C001_0015
317 * Errata 63 for SH-B3 steppings
318 * Errata 122 for all steppings (F+ have it disabled by default)
321 rdmsrl(MSR_K7_HWCR
, value
);
323 wrmsrl(MSR_K7_HWCR
, value
);
330 * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
331 * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
333 clear_cpu_cap(c
, 0*32+31);
336 /* On C+ stepping K8 rep microcode works well for copy/memset */
340 level
= cpuid_eax(1);
341 if((level
>= 0x0f48 && level
< 0x0f50) || level
>= 0x0f58)
342 set_cpu_cap(c
, X86_FEATURE_REP_GOOD
);
344 if (c
->x86
== 0x10 || c
->x86
== 0x11)
345 set_cpu_cap(c
, X86_FEATURE_REP_GOOD
);
349 * FIXME: We should handle the K5 here. Set up the write
350 * range and also turn on MSR 83 bits 4 and 31 (write alloc,
361 case 6: /* An Athlon/Duron */
366 /* K6s reports MCEs but don't actually have all the MSRs */
368 clear_cpu_cap(c
, X86_FEATURE_MCE
);
371 /* Enable workaround for FXSAVE leak */
373 set_cpu_cap(c
, X86_FEATURE_FXSAVE_LEAK
);
375 if (!c
->x86_model_id
[0]) {
378 /* Should distinguish Models here, but this is only
379 a fallback anyways. */
380 strcpy(c
->x86_model_id
, "Hammer");
385 display_cacheinfo(c
);
387 /* Multi core CPU? */
388 if (c
->extended_cpuid_level
>= 0x80000008) {
397 if (c
->extended_cpuid_level
>= 0x80000006) {
398 if ((c
->x86
>= 0x0f) && (cpuid_edx(0x80000006) & 0xf000))
399 num_cache_leaves
= 4;
401 num_cache_leaves
= 3;
404 if (c
->x86
>= 0xf && c
->x86
<= 0x11)
405 set_cpu_cap(c
, X86_FEATURE_K8
);
408 /* MFENCE stops RDTSC speculation */
409 set_cpu_cap(c
, X86_FEATURE_MFENCE_RDTSC
);
413 if (c
->x86
== 0x10) {
414 /* do this for boot cpu */
415 if (c
== &boot_cpu_data
)
416 check_enable_amd_mmconf_dmi();
418 fam10h_check_enable_mmcfg();
421 if (c
== &boot_cpu_data
&& c
->x86
>= 0xf && c
->x86
<= 0x11) {
422 unsigned long long tseg
;
425 * Split up direct mapping around the TSEG SMM area.
426 * Don't do it for gbpages because there seems very little
427 * benefit in doing so.
429 if (!rdmsrl_safe(MSR_K8_TSEG_ADDR
, &tseg
)) {
430 printk(KERN_DEBUG
"tseg: %010llx\n", tseg
);
431 if ((tseg
>>PMD_SHIFT
) <
432 (max_low_pfn_mapped
>>(PMD_SHIFT
-PAGE_SHIFT
)) ||
434 (max_pfn_mapped
>>(PMD_SHIFT
-PAGE_SHIFT
)) &&
435 (tseg
>>PMD_SHIFT
) >= (1ULL<<(32 - PMD_SHIFT
))))
436 set_memory_4k((unsigned long)__va(tseg
), 1);
443 static unsigned int __cpuinit
amd_size_cache(struct cpuinfo_x86
*c
, unsigned int size
)
445 /* AMD errata T13 (order #21922) */
447 if (c
->x86_model
== 3 && c
->x86_mask
== 0) /* Duron Rev A0 */
449 if (c
->x86_model
== 4 &&
450 (c
->x86_mask
== 0 || c
->x86_mask
== 1)) /* Tbird rev A1/A2 */
457 static struct cpu_dev amd_cpu_dev __cpuinitdata
= {
459 .c_ident
= { "AuthenticAMD" },
462 { .vendor
= X86_VENDOR_AMD
, .family
= 4, .model_names
=
473 .c_size_cache
= amd_size_cache
,
475 .c_early_init
= early_init_amd
,
477 .c_x86_vendor
= X86_VENDOR_AMD
,
480 cpu_dev_register(amd_cpu_dev
);