git.oblomov.eu Git - linux-2.6/blob - arch/x86/kernel/cpu/amd.c

   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>
   6 #include <asm/apic.h>
   7 #include <asm/mmconfig.h>
   8
   9 #include <mach_apic.h>
  10 #include "../setup.h"
  11 #include "cpu.h"
  12
  13 /*
  14  *      B step AMD K6 before B 9730xxxx have hardware bugs that can cause
  15  *      misexecution of code under Linux. Owners of such processors should
  16  *      contact AMD for precise details and a CPU swap.
  17  *
  18  *      See     http://www.multimania.com/poulot/k6bug.html
  19  *              http://www.amd.com/K6/k6docs/revgd.html
  20  *
  21  *      The following test is erm.. interesting. AMD neglected to up
  22  *      the chip setting when fixing the bug but they also tweaked some
  23  *      performance at the same time..
  24  */
  25
  26 extern void vide(void);
  27 __asm__(".align 4\nvide: ret");
  28
  29 #ifdef CONFIG_X86_LOCAL_APIC
  30 #define ENABLE_C1E_MASK         0x18000000
  31 #define CPUID_PROCESSOR_SIGNATURE       1
  32 #define CPUID_XFAM              0x0ff00000
  33 #define CPUID_XFAM_K8           0x00000000
  34 #define CPUID_XFAM_10H          0x00100000
  35 #define CPUID_XFAM_11H          0x00200000
  36 #define CPUID_XMOD              0x000f0000
  37 #define CPUID_XMOD_REV_F        0x00040000
  38
  39 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
  40 static __cpuinit int amd_apic_timer_broken(void)
  41 {
  42         u32 lo, hi;
  43         u32 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
  44         switch (eax & CPUID_XFAM) {
  45         case CPUID_XFAM_K8:
  46                 if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
  47                         break;
  48         case CPUID_XFAM_10H:
  49         case CPUID_XFAM_11H:
  50                 rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
  51                 if (lo & ENABLE_C1E_MASK) {
  52                         if (smp_processor_id() != boot_cpu_physical_apicid)
  53                                 printk(KERN_INFO "AMD C1E detected late. "
  54                                        "        Force timer broadcast.\n");
  55                         return 1;
  56                 }
  57                 break;
  58         default:
  59                 /* err on the side of caution */
  60                 return 1;
  61         }
  62         return 0;
  63 }
  64 #endif
  65
  66 int force_mwait __cpuinitdata;
  67
  68 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
  69 {
  70         if (cpuid_eax(0x80000000) >= 0x80000007) {
  71                 c->x86_power = cpuid_edx(0x80000007);
  72                 if (c->x86_power & (1<<8))
  73                         set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  74         }
  75 }
  76
  77 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
  78 {
  79         u32 l, h;
  80         int mbytes = num_physpages >> (20-PAGE_SHIFT);
  81         int r;
  82
  83 #ifdef CONFIG_SMP
  84         unsigned long long value;
  85
  86         /*
  87          * Disable TLB flush filter by setting HWCR.FFDIS on K8
  88          * bit 6 of msr C001_0015
  89          *
  90          * Errata 63 for SH-B3 steppings
  91          * Errata 122 for all steppings (F+ have it disabled by default)
  92          */
  93         if (c->x86 == 15) {
  94                 rdmsrl(MSR_K7_HWCR, value);
  95                 value |= 1 << 6;
  96                 wrmsrl(MSR_K7_HWCR, value);
  97         }
  98 #endif
  99
 100         early_init_amd(c);
 101
 102         /*
 103          *      FIXME: We should handle the K5 here. Set up the write
 104          *      range and also turn on MSR 83 bits 4 and 31 (write alloc,
 105          *      no bus pipeline)
 106          */
 107
 108         /*
 109          * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
 110          * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
 111          */
 112         clear_cpu_cap(c, 0*32+31);
 113
 114         r = get_model_name(c);
 115
 116         switch (c->x86) {
 117         case 4:
 118                 /*
 119                  * General Systems BIOSen alias the cpu frequency registers
 120                  * of the Elan at 0x000df000. Unfortuantly, one of the Linux
 121                  * drivers subsequently pokes it, and changes the CPU speed.
 122                  * Workaround : Remove the unneeded alias.
 123                  */
 124 #define CBAR            (0xfffc) /* Configuration Base Address  (32-bit) */
 125 #define CBAR_ENB        (0x80000000)
 126 #define CBAR_KEY        (0X000000CB)
 127                         if (c->x86_model == 9 || c->x86_model == 10) {
 128                                 if (inl (CBAR) & CBAR_ENB)
 129                                         outl (0 | CBAR_KEY, CBAR);
 130                         }
 131                         break;
 132         case 5:
 133                         if (c->x86_model < 6) {
 134                                 /* Based on AMD doc 20734R - June 2000 */
 135                                 if (c->x86_model == 0) {
 136                                         clear_cpu_cap(c, X86_FEATURE_APIC);
 137                                         set_cpu_cap(c, X86_FEATURE_PGE);
 138                                 }
 139                                 break;
 140                         }
 141
 142                         if (c->x86_model == 6 && c->x86_mask == 1) {
 143                                 const int K6_BUG_LOOP = 1000000;
 144                                 int n;
 145                                 void (*f_vide)(void);
 146                                 unsigned long d, d2;
 147
 148                                 printk(KERN_INFO "AMD K6 stepping B detected - ");
 149
 150                                 /*
 151                                  * It looks like AMD fixed the 2.6.2 bug and improved indirect
 152                                  * calls at the same time.
 153                                  */
 154
 155                                 n = K6_BUG_LOOP;
 156                                 f_vide = vide;
 157                                 rdtscl(d);
 158                                 while (n--)
 159                                         f_vide();
 160                                 rdtscl(d2);
 161                                 d = d2-d;
 162
 163                                 if (d > 20*K6_BUG_LOOP)
 164                                         printk("system stability may be impaired when more than 32 MB are used.\n");
 165                                 else
 166                                         printk("probably OK (after B9730xxxx).\n");
 167                                 printk(KERN_INFO "Please see http://membres.lycos.fr/poulot/k6bug.html\n");
 168                         }
 169
 170                         /* K6 with old style WHCR */
 171                         if (c->x86_model < 8 ||
 172                            (c->x86_model == 8 && c->x86_mask < 8)) {
 173                                 /* We can only write allocate on the low 508Mb */
 174                                 if (mbytes > 508)
 175                                         mbytes = 508;
 176
 177                                 rdmsr(MSR_K6_WHCR, l, h);
 178                                 if ((l&0x0000FFFF) == 0) {
 179                                         unsigned long flags;
 180                                         l = (1<<0)|((mbytes/4)<<1);
 181                                         local_irq_save(flags);
 182                                         wbinvd();
 183                                         wrmsr(MSR_K6_WHCR, l, h);
 184                                         local_irq_restore(flags);
 185                                         printk(KERN_INFO "Enabling old style K6 write allocation for %d Mb\n",
 186                                                 mbytes);
 187                                 }
 188                                 break;
 189                         }
 190
 191                         if ((c->x86_model == 8 && c->x86_mask > 7) ||
 192                              c->x86_model == 9 || c->x86_model == 13) {
 193                                 /* The more serious chips .. */
 194
 195                                 if (mbytes > 4092)
 196                                         mbytes = 4092;
 197
 198                                 rdmsr(MSR_K6_WHCR, l, h);
 199                                 if ((l&0xFFFF0000) == 0) {
 200                                         unsigned long flags;
 201                                         l = ((mbytes>>2)<<22)|(1<<16);
 202                                         local_irq_save(flags);
 203                                         wbinvd();
 204                                         wrmsr(MSR_K6_WHCR, l, h);
 205                                         local_irq_restore(flags);
 206                                         printk(KERN_INFO "Enabling new style K6 write allocation for %d Mb\n",
 207                                                 mbytes);
 208                                 }
 209
 210                                 /*  Set MTRR capability flag if appropriate */
 211                                 if (c->x86_model == 13 || c->x86_model == 9 ||
 212                                    (c->x86_model == 8 && c->x86_mask >= 8))
 213                                         set_cpu_cap(c, X86_FEATURE_K6_MTRR);
 214                                 break;
 215                         }
 216
 217                         if (c->x86_model == 10) {
 218                                 /* AMD Geode LX is model 10 */
 219                                 /* placeholder for any needed mods */
 220                                 break;
 221                         }
 222                         break;
 223         case 6: /* An Athlon/Duron */
 224
 225                         /*
 226                          * Bit 15 of Athlon specific MSR 15, needs to be 0
 227                          * to enable SSE on Palomino/Morgan/Barton CPU's.
 228                          * If the BIOS didn't enable it already, enable it here.
 229                          */
 230                         if (c->x86_model >= 6 && c->x86_model <= 10) {
 231                                 if (!cpu_has(c, X86_FEATURE_XMM)) {
 232                                         printk(KERN_INFO "Enabling disabled K7/SSE Support.\n");
 233                                         rdmsr(MSR_K7_HWCR, l, h);
 234                                         l &= ~0x00008000;
 235                                         wrmsr(MSR_K7_HWCR, l, h);
 236                                         set_cpu_cap(c, X86_FEATURE_XMM);
 237                                 }
 238                         }
 239
 240                         /*
 241                          * It's been determined by AMD that Athlons since model 8 stepping 1
 242                          * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx
 243                          * As per AMD technical note 27212 0.2
 244                          */
 245                         if ((c->x86_model == 8 && c->x86_mask >= 1) || (c->x86_model > 8)) {
 246                                 rdmsr(MSR_K7_CLK_CTL, l, h);
 247                                 if ((l & 0xfff00000) != 0x20000000) {
 248                                         printk ("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n", l,
 249                                                 ((l & 0x000fffff)|0x20000000));
 250                                         wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h);
 251                                 }
 252                         }
 253                         break;
 254         }
 255
 256         switch (c->x86) {
 257         case 15:
 258         /* Use K8 tuning for Fam10h and Fam11h */
 259         case 0x10:
 260         case 0x11:
 261                 set_cpu_cap(c, X86_FEATURE_K8);
 262                 break;
 263         case 6:
 264                 set_cpu_cap(c, X86_FEATURE_K7);
 265                 break;
 266         }
 267         if (c->x86 >= 6)
 268                 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
 269
 270         display_cacheinfo(c);
 271
 272         if (cpuid_eax(0x80000000) >= 0x80000008)
 273                 c->x86_max_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
 274
 275 #ifdef CONFIG_X86_HT
 276         /*
 277          * On a AMD multi core setup the lower bits of the APIC id
 278          * distinguish the cores.
 279          */
 280         if (c->x86_max_cores > 1) {
 281                 int cpu = smp_processor_id();
 282                 unsigned bits = (cpuid_ecx(0x80000008) >> 12) & 0xf;
 283
 284                 if (bits == 0) {
 285                         while ((1 << bits) < c->x86_max_cores)
 286                                 bits++;
 287                 }
 288                 c->cpu_core_id = c->phys_proc_id & ((1<<bits)-1);
 289                 c->phys_proc_id >>= bits;
 290                 printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
 291                        cpu, c->x86_max_cores, c->cpu_core_id);
 292         }
 293 #endif
 294
 295         if (cpuid_eax(0x80000000) >= 0x80000006) {
 296                 if ((c->x86 == 0x10) && (cpuid_edx(0x80000006) & 0xf000))
 297                         num_cache_leaves = 4;
 298                 else
 299                         num_cache_leaves = 3;
 300         }
 301
 302 #ifdef CONFIG_X86_LOCAL_APIC
 303         if (amd_apic_timer_broken())
 304                 local_apic_timer_disabled = 1;
 305 #endif
 306
 307         /* K6s reports MCEs but don't actually have all the MSRs */
 308         if (c->x86 < 6)
 309                 clear_cpu_cap(c, X86_FEATURE_MCE);
 310
 311         if (cpu_has_xmm2)
 312                 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
 313
 314         if (c->x86 == 0x10)
 315                 amd_enable_pci_ext_cfg(c);
 316 }
 317
 318 static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
 319 {
 320         /* AMD errata T13 (order #21922) */
 321         if ((c->x86 == 6)) {
 322                 if (c->x86_model == 3 && c->x86_mask == 0)      /* Duron Rev A0 */
 323                         size = 64;
 324                 if (c->x86_model == 4 &&
 325                     (c->x86_mask == 0 || c->x86_mask == 1))     /* Tbird rev A1/A2 */
 326                         size = 256;
 327         }
 328         return size;
 329 }
 330
 331 static struct cpu_dev amd_cpu_dev __cpuinitdata = {
 332         .c_vendor       = "AMD",
 333         .c_ident        = { "AuthenticAMD" },
 334         .c_models = {
 335                 { .vendor = X86_VENDOR_AMD, .family = 4, .model_names =
 336                   {
 337                           [3] = "486 DX/2",
 338                           [7] = "486 DX/2-WB",
 339                           [8] = "486 DX/4",
 340                           [9] = "486 DX/4-WB",
 341                           [14] = "Am5x86-WT",
 342                           [15] = "Am5x86-WB"
 343                   }
 344                 },
 345         },
 346         .c_early_init   = early_init_amd,
 347         .c_init         = init_amd,
 348         .c_size_cache   = amd_size_cache,
 349 };
 350
 351 cpu_vendor_dev_register(X86_VENDOR_AMD, &amd_cpu_dev);