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