arch/x86/kernel/cpu/intel.c

   1 #include <linux/init.h>
   2 #include <linux/kernel.h>
   3
   4 #include <linux/string.h>
   5 #include <linux/bitops.h>
   6 #include <linux/smp.h>
   7 #include <linux/thread_info.h>
   8 #include <linux/module.h>
   9
  10 #include <asm/processor.h>
  11 #include <asm/pgtable.h>
  12 #include <asm/msr.h>
  13 #include <asm/uaccess.h>
  14 #include <asm/ptrace.h>
  15 #include <asm/ds.h>
  16 #include <asm/bugs.h>
  17
  18 #ifdef CONFIG_X86_64
  19 #include <asm/topology.h>
  20 #include <asm/numa_64.h>
  21 #endif
  22
  23 #include "cpu.h"
  24
  25 #ifdef CONFIG_X86_LOCAL_APIC
  26 #include <asm/mpspec.h>
  27 #include <asm/apic.h>
  28 #include <mach_apic.h>
  29 #endif
  30
  31 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
  32 {
  33         if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
  34                 (c->x86 == 0x6 && c->x86_model >= 0x0e))
  35                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  36
  37 #ifdef CONFIG_X86_64
  38         set_cpu_cap(c, X86_FEATURE_SYSENTER32);
  39 #else
  40         /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
  41         if (c->x86 == 15 && c->x86_cache_alignment == 64)
  42                 c->x86_cache_alignment = 128;
  43 #endif
  44
  45         /*
  46          * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
  47          * with P/T states and does not stop in deep C-states
  48          */
  49         if (c->x86_power & (1 << 8)) {
  50                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  51                 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
  52         }
  53
  54 }
  55
  56 #ifdef CONFIG_X86_32
  57 /*
  58  *      Early probe support logic for ppro memory erratum #50
  59  *
  60  *      This is called before we do cpu ident work
  61  */
  62
  63 int __cpuinit ppro_with_ram_bug(void)
  64 {
  65         /* Uses data from early_cpu_detect now */
  66         if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
  67             boot_cpu_data.x86 == 6 &&
  68             boot_cpu_data.x86_model == 1 &&
  69             boot_cpu_data.x86_mask < 8) {
  70                 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
  71                 return 1;
  72         }
  73         return 0;
  74 }
  75
  76 #ifdef CONFIG_X86_F00F_BUG
  77 static void __cpuinit trap_init_f00f_bug(void)
  78 {
  79         __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
  80
  81         /*
  82          * Update the IDT descriptor and reload the IDT so that
  83          * it uses the read-only mapped virtual address.
  84          */
  85         idt_descr.address = fix_to_virt(FIX_F00F_IDT);
  86         load_idt(&idt_descr);
  87 }
  88 #endif
  89
  90 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
  91 {
  92         unsigned long lo, hi;
  93
  94 #ifdef CONFIG_X86_F00F_BUG
  95         /*
  96          * All current models of Pentium and Pentium with MMX technology CPUs
  97          * have the F0 0F bug, which lets nonprivileged users lock up the system.
  98          * Note that the workaround only should be initialized once...
  99          */
 100         c->f00f_bug = 0;
 101         if (!paravirt_enabled() && c->x86 == 5) {
 102                 static int f00f_workaround_enabled;
 103
 104                 c->f00f_bug = 1;
 105                 if (!f00f_workaround_enabled) {
 106                         trap_init_f00f_bug();
 107                         printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
 108                         f00f_workaround_enabled = 1;
 109                 }
 110         }
 111 #endif
 112
 113         /*
 114          * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
 115          * model 3 mask 3
 116          */
 117         if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
 118                 clear_cpu_cap(c, X86_FEATURE_SEP);
 119
 120         /*
 121          * P4 Xeon errata 037 workaround.
 122          * Hardware prefetcher may cause stale data to be loaded into the cache.
 123          */
 124         if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
 125                 rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
 126                 if ((lo & (1<<9)) == 0) {
 127                         printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
 128                         printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
 129                         lo |= (1<<9);   /* Disable hw prefetching */
 130                         wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
 131                 }
 132         }
 133
 134         /*
 135          * See if we have a good local APIC by checking for buggy Pentia,
 136          * i.e. all B steppings and the C2 stepping of P54C when using their
 137          * integrated APIC (see 11AP erratum in "Pentium Processor
 138          * Specification Update").
 139          */
 140         if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
 141             (c->x86_mask < 0x6 || c->x86_mask == 0xb))
 142                 set_cpu_cap(c, X86_FEATURE_11AP);
 143
 144
 145 #ifdef CONFIG_X86_INTEL_USERCOPY
 146         /*
 147          * Set up the preferred alignment for movsl bulk memory moves
 148          */
 149         switch (c->x86) {
 150         case 4:         /* 486: untested */
 151                 break;
 152         case 5:         /* Old Pentia: untested */
 153                 break;
 154         case 6:         /* PII/PIII only like movsl with 8-byte alignment */
 155                 movsl_mask.mask = 7;
 156                 break;
 157         case 15:        /* P4 is OK down to 8-byte alignment */
 158                 movsl_mask.mask = 7;
 159                 break;
 160         }
 161 #endif
 162
 163 #ifdef CONFIG_X86_NUMAQ
 164         numaq_tsc_disable();
 165 #endif
 166 }
 167 #else
 168 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 169 {
 170 }
 171 #endif
 172
 173 static void __cpuinit srat_detect_node(void)
 174 {
 175 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
 176         unsigned node;
 177         int cpu = smp_processor_id();
 178         int apicid = hard_smp_processor_id();
 179
 180         /* Don't do the funky fallback heuristics the AMD version employs
 181            for now. */
 182         node = apicid_to_node[apicid];
 183         if (node == NUMA_NO_NODE || !node_online(node))
 184                 node = first_node(node_online_map);
 185         numa_set_node(cpu, node);
 186
 187         printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
 188 #endif
 189 }
 190
 191 /*
 192  * find out the number of processor cores on the die
 193  */
 194 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
 195 {
 196         unsigned int eax, ebx, ecx, edx;
 197
 198         if (c->cpuid_level < 4)
 199                 return 1;
 200
 201         /* Intel has a non-standard dependency on %ecx for this CPUID level. */
 202         cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
 203         if (eax & 0x1f)
 204                 return ((eax >> 26) + 1);
 205         else
 206                 return 1;
 207 }
 208
 209 static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
 210 {
 211         /* Intel VMX MSR indicated features */
 212 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW    0x00200000
 213 #define X86_VMX_FEATURE_PROC_CTLS_VNMI          0x00400000
 214 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS      0x80000000
 215 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC    0x00000001
 216 #define X86_VMX_FEATURE_PROC_CTLS2_EPT          0x00000002
 217 #define X86_VMX_FEATURE_PROC_CTLS2_VPID         0x00000020
 218
 219         u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
 220
 221         clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
 222         clear_cpu_cap(c, X86_FEATURE_VNMI);
 223         clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
 224         clear_cpu_cap(c, X86_FEATURE_EPT);
 225         clear_cpu_cap(c, X86_FEATURE_VPID);
 226
 227         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
 228         msr_ctl = vmx_msr_high | vmx_msr_low;
 229         if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
 230                 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
 231         if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
 232                 set_cpu_cap(c, X86_FEATURE_VNMI);
 233         if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
 234                 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
 235                       vmx_msr_low, vmx_msr_high);
 236                 msr_ctl2 = vmx_msr_high | vmx_msr_low;
 237                 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
 238                     (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
 239                         set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
 240                 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
 241                         set_cpu_cap(c, X86_FEATURE_EPT);
 242                 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
 243                         set_cpu_cap(c, X86_FEATURE_VPID);
 244         }
 245 }
 246
 247 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 248 {
 249         unsigned int l2 = 0;
 250
 251         early_init_intel(c);
 252
 253         intel_workarounds(c);
 254
 255         /*
 256          * Detect the extended topology information if available. This
 257          * will reinitialise the initial_apicid which will be used
 258          * in init_intel_cacheinfo()
 259          */
 260         detect_extended_topology(c);
 261
 262         l2 = init_intel_cacheinfo(c);
 263         if (c->cpuid_level > 9) {
 264                 unsigned eax = cpuid_eax(10);
 265                 /* Check for version and the number of counters */
 266                 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
 267                         set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
 268         }
 269
 270         if (cpu_has_xmm2)
 271                 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
 272         if (cpu_has_ds) {
 273                 unsigned int l1;
 274                 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
 275                 if (!(l1 & (1<<11)))
 276                         set_cpu_cap(c, X86_FEATURE_BTS);
 277                 if (!(l1 & (1<<12)))
 278                         set_cpu_cap(c, X86_FEATURE_PEBS);
 279                 ds_init_intel(c);
 280         }
 281
 282 #ifdef CONFIG_X86_64
 283         if (c->x86 == 15)
 284                 c->x86_cache_alignment = c->x86_clflush_size * 2;
 285         if (c->x86 == 6)
 286                 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 287 #else
 288         /*
 289          * Names for the Pentium II/Celeron processors
 290          * detectable only by also checking the cache size.
 291          * Dixon is NOT a Celeron.
 292          */
 293         if (c->x86 == 6) {
 294                 char *p = NULL;
 295
 296                 switch (c->x86_model) {
 297                 case 5:
 298                         if (c->x86_mask == 0) {
 299                                 if (l2 == 0)
 300                                         p = "Celeron (Covington)";
 301                                 else if (l2 == 256)
 302                                         p = "Mobile Pentium II (Dixon)";
 303                         }
 304                         break;
 305
 306                 case 6:
 307                         if (l2 == 128)
 308                                 p = "Celeron (Mendocino)";
 309                         else if (c->x86_mask == 0 || c->x86_mask == 5)
 310                                 p = "Celeron-A";
 311                         break;
 312
 313                 case 8:
 314                         if (l2 == 128)
 315                                 p = "Celeron (Coppermine)";
 316                         break;
 317                 }
 318
 319                 if (p)
 320                         strcpy(c->x86_model_id, p);
 321         }
 322
 323         if (c->x86 == 15)
 324                 set_cpu_cap(c, X86_FEATURE_P4);
 325         if (c->x86 == 6)
 326                 set_cpu_cap(c, X86_FEATURE_P3);
 327 #endif
 328
 329         if (cpu_has_bts)
 330                 ptrace_bts_init_intel(c);
 331
 332         if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
 333                 /*
 334                  * let's use the legacy cpuid vector 0x1 and 0x4 for topology
 335                  * detection.
 336                  */
 337                 c->x86_max_cores = intel_num_cpu_cores(c);
 338 #ifdef CONFIG_X86_32
 339                 detect_ht(c);
 340 #endif
 341         }
 342
 343         /* Work around errata */
 344         srat_detect_node();
 345
 346         if (cpu_has(c, X86_FEATURE_VMX))
 347                 detect_vmx_virtcap(c);
 348 }
 349
 350 #ifdef CONFIG_X86_32
 351 static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
 352 {
 353         /*
 354          * Intel PIII Tualatin. This comes in two flavours.
 355          * One has 256kb of cache, the other 512. We have no way
 356          * to determine which, so we use a boottime override
 357          * for the 512kb model, and assume 256 otherwise.
 358          */
 359         if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
 360                 size = 256;
 361         return size;
 362 }
 363 #endif
 364
 365 static struct cpu_dev intel_cpu_dev __cpuinitdata = {
 366         .c_vendor       = "Intel",
 367         .c_ident        = { "GenuineIntel" },
 368 #ifdef CONFIG_X86_32
 369         .c_models = {
 370                 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
 371                   {
 372                           [0] = "486 DX-25/33",
 373                           [1] = "486 DX-50",
 374                           [2] = "486 SX",
 375                           [3] = "486 DX/2",
 376                           [4] = "486 SL",
 377                           [5] = "486 SX/2",
 378                           [7] = "486 DX/2-WB",
 379                           [8] = "486 DX/4",
 380                           [9] = "486 DX/4-WB"
 381                   }
 382                 },
 383                 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
 384                   {
 385                           [0] = "Pentium 60/66 A-step",
 386                           [1] = "Pentium 60/66",
 387                           [2] = "Pentium 75 - 200",
 388                           [3] = "OverDrive PODP5V83",
 389                           [4] = "Pentium MMX",
 390                           [7] = "Mobile Pentium 75 - 200",
 391                           [8] = "Mobile Pentium MMX"
 392                   }
 393                 },
 394                 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
 395                   {
 396                           [0] = "Pentium Pro A-step",
 397                           [1] = "Pentium Pro",
 398                           [3] = "Pentium II (Klamath)",
 399                           [4] = "Pentium II (Deschutes)",
 400                           [5] = "Pentium II (Deschutes)",
 401                           [6] = "Mobile Pentium II",
 402                           [7] = "Pentium III (Katmai)",
 403                           [8] = "Pentium III (Coppermine)",
 404                           [10] = "Pentium III (Cascades)",
 405                           [11] = "Pentium III (Tualatin)",
 406                   }
 407                 },
 408                 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
 409                   {
 410                           [0] = "Pentium 4 (Unknown)",
 411                           [1] = "Pentium 4 (Willamette)",
 412                           [2] = "Pentium 4 (Northwood)",
 413                           [4] = "Pentium 4 (Foster)",
 414                           [5] = "Pentium 4 (Foster)",
 415                   }
 416                 },
 417         },
 418         .c_size_cache   = intel_size_cache,
 419 #endif
 420         .c_early_init   = early_init_intel,
 421         .c_init         = init_intel,
 422         .c_x86_vendor   = X86_VENDOR_INTEL,
 423 };
 424
 425 cpu_dev_register(intel_cpu_dev);
 426