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/ds.h>
  15 #include <asm/bugs.h>
  16
  17 #ifdef CONFIG_X86_64
  18 #include <asm/topology.h>
  19 #include <asm/numa_64.h>
  20 #endif
  21
  22 #include "cpu.h"
  23
  24 #ifdef CONFIG_X86_LOCAL_APIC
  25 #include <asm/mpspec.h>
  26 #include <asm/apic.h>
  27 #include <mach_apic.h>
  28 #endif
  29
  30 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
  31 {
  32         /* Unmask CPUID levels if masked: */
  33         if (c->x86 == 6 && c->x86_model >= 15) {
  34                 u64 misc_enable;
  35
  36                 rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
  37
  38                 if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
  39                         misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
  40                         wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
  41                         c->cpuid_level = cpuid_eax(0);
  42                 }
  43         }
  44
  45         if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
  46                 (c->x86 == 0x6 && c->x86_model >= 0x0e))
  47                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  48
  49 #ifdef CONFIG_X86_64
  50         set_cpu_cap(c, X86_FEATURE_SYSENTER32);
  51 #else
  52         /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
  53         if (c->x86 == 15 && c->x86_cache_alignment == 64)
  54                 c->x86_cache_alignment = 128;
  55 #endif
  56
  57         /*
  58          * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
  59          * with P/T states and does not stop in deep C-states
  60          */
  61         if (c->x86_power & (1 << 8)) {
  62                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  63                 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
  64         }
  65
  66 }
  67
  68 #ifdef CONFIG_X86_32
  69 /*
  70  *      Early probe support logic for ppro memory erratum #50
  71  *
  72  *      This is called before we do cpu ident work
  73  */
  74
  75 int __cpuinit ppro_with_ram_bug(void)
  76 {
  77         /* Uses data from early_cpu_detect now */
  78         if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
  79             boot_cpu_data.x86 == 6 &&
  80             boot_cpu_data.x86_model == 1 &&
  81             boot_cpu_data.x86_mask < 8) {
  82                 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
  83                 return 1;
  84         }
  85         return 0;
  86 }
  87
  88 #ifdef CONFIG_X86_F00F_BUG
  89 static void __cpuinit trap_init_f00f_bug(void)
  90 {
  91         __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
  92
  93         /*
  94          * Update the IDT descriptor and reload the IDT so that
  95          * it uses the read-only mapped virtual address.
  96          */
  97         idt_descr.address = fix_to_virt(FIX_F00F_IDT);
  98         load_idt(&idt_descr);
  99 }
 100 #endif
 101
 102 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 103 {
 104         unsigned long lo, hi;
 105
 106 #ifdef CONFIG_X86_F00F_BUG
 107         /*
 108          * All current models of Pentium and Pentium with MMX technology CPUs
 109          * have the F0 0F bug, which lets nonprivileged users lock up the system.
 110          * Note that the workaround only should be initialized once...
 111          */
 112         c->f00f_bug = 0;
 113         if (!paravirt_enabled() && c->x86 == 5) {
 114                 static int f00f_workaround_enabled;
 115
 116                 c->f00f_bug = 1;
 117                 if (!f00f_workaround_enabled) {
 118                         trap_init_f00f_bug();
 119                         printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
 120                         f00f_workaround_enabled = 1;
 121                 }
 122         }
 123 #endif
 124
 125         /*
 126          * SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
 127          * model 3 mask 3
 128          */
 129         if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
 130                 clear_cpu_cap(c, X86_FEATURE_SEP);
 131
 132         /*
 133          * P4 Xeon errata 037 workaround.
 134          * Hardware prefetcher may cause stale data to be loaded into the cache.
 135          */
 136         if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
 137                 rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
 138                 if ((lo & (1<<9)) == 0) {
 139                         printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
 140                         printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
 141                         lo |= (1<<9);   /* Disable hw prefetching */
 142                         wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
 143                 }
 144         }
 145
 146         /*
 147          * See if we have a good local APIC by checking for buggy Pentia,
 148          * i.e. all B steppings and the C2 stepping of P54C when using their
 149          * integrated APIC (see 11AP erratum in "Pentium Processor
 150          * Specification Update").
 151          */
 152         if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
 153             (c->x86_mask < 0x6 || c->x86_mask == 0xb))
 154                 set_cpu_cap(c, X86_FEATURE_11AP);
 155
 156
 157 #ifdef CONFIG_X86_INTEL_USERCOPY
 158         /*
 159          * Set up the preferred alignment for movsl bulk memory moves
 160          */
 161         switch (c->x86) {
 162         case 4:         /* 486: untested */
 163                 break;
 164         case 5:         /* Old Pentia: untested */
 165                 break;
 166         case 6:         /* PII/PIII only like movsl with 8-byte alignment */
 167                 movsl_mask.mask = 7;
 168                 break;
 169         case 15:        /* P4 is OK down to 8-byte alignment */
 170                 movsl_mask.mask = 7;
 171                 break;
 172         }
 173 #endif
 174
 175 #ifdef CONFIG_X86_NUMAQ
 176         numaq_tsc_disable();
 177 #endif
 178 }
 179 #else
 180 static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 181 {
 182 }
 183 #endif
 184
 185 static void __cpuinit srat_detect_node(void)
 186 {
 187 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
 188         unsigned node;
 189         int cpu = smp_processor_id();
 190         int apicid = hard_smp_processor_id();
 191
 192         /* Don't do the funky fallback heuristics the AMD version employs
 193            for now. */
 194         node = apicid_to_node[apicid];
 195         if (node == NUMA_NO_NODE || !node_online(node))
 196                 node = first_node(node_online_map);
 197         numa_set_node(cpu, node);
 198
 199         printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
 200 #endif
 201 }
 202
 203 /*
 204  * find out the number of processor cores on the die
 205  */
 206 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
 207 {
 208         unsigned int eax, ebx, ecx, edx;
 209
 210         if (c->cpuid_level < 4)
 211                 return 1;
 212
 213         /* Intel has a non-standard dependency on %ecx for this CPUID level. */
 214         cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
 215         if (eax & 0x1f)
 216                 return ((eax >> 26) + 1);
 217         else
 218                 return 1;
 219 }
 220
 221 static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
 222 {
 223         /* Intel VMX MSR indicated features */
 224 #define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW    0x00200000
 225 #define X86_VMX_FEATURE_PROC_CTLS_VNMI          0x00400000
 226 #define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS      0x80000000
 227 #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC    0x00000001
 228 #define X86_VMX_FEATURE_PROC_CTLS2_EPT          0x00000002
 229 #define X86_VMX_FEATURE_PROC_CTLS2_VPID         0x00000020
 230
 231         u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
 232
 233         clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
 234         clear_cpu_cap(c, X86_FEATURE_VNMI);
 235         clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
 236         clear_cpu_cap(c, X86_FEATURE_EPT);
 237         clear_cpu_cap(c, X86_FEATURE_VPID);
 238
 239         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
 240         msr_ctl = vmx_msr_high | vmx_msr_low;
 241         if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
 242                 set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
 243         if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
 244                 set_cpu_cap(c, X86_FEATURE_VNMI);
 245         if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
 246                 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
 247                       vmx_msr_low, vmx_msr_high);
 248                 msr_ctl2 = vmx_msr_high | vmx_msr_low;
 249                 if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
 250                     (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
 251                         set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
 252                 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
 253                         set_cpu_cap(c, X86_FEATURE_EPT);
 254                 if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
 255                         set_cpu_cap(c, X86_FEATURE_VPID);
 256         }
 257 }
 258
 259 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 260 {
 261         unsigned int l2 = 0;
 262
 263         early_init_intel(c);
 264
 265         intel_workarounds(c);
 266
 267         /*
 268          * Detect the extended topology information if available. This
 269          * will reinitialise the initial_apicid which will be used
 270          * in init_intel_cacheinfo()
 271          */
 272         detect_extended_topology(c);
 273
 274         l2 = init_intel_cacheinfo(c);
 275         if (c->cpuid_level > 9) {
 276                 unsigned eax = cpuid_eax(10);
 277                 /* Check for version and the number of counters */
 278                 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
 279                         set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
 280         }
 281
 282         if (cpu_has_xmm2)
 283                 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
 284         if (cpu_has_ds) {
 285                 unsigned int l1;
 286                 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
 287                 if (!(l1 & (1<<11)))
 288                         set_cpu_cap(c, X86_FEATURE_BTS);
 289                 if (!(l1 & (1<<12)))
 290                         set_cpu_cap(c, X86_FEATURE_PEBS);
 291                 ds_init_intel(c);
 292         }
 293
 294 #ifdef CONFIG_X86_64
 295         if (c->x86 == 15)
 296                 c->x86_cache_alignment = c->x86_clflush_size * 2;
 297         if (c->x86 == 6)
 298                 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 299 #else
 300         /*
 301          * Names for the Pentium II/Celeron processors
 302          * detectable only by also checking the cache size.
 303          * Dixon is NOT a Celeron.
 304          */
 305         if (c->x86 == 6) {
 306                 char *p = NULL;
 307
 308                 switch (c->x86_model) {
 309                 case 5:
 310                         if (c->x86_mask == 0) {
 311                                 if (l2 == 0)
 312                                         p = "Celeron (Covington)";
 313                                 else if (l2 == 256)
 314                                         p = "Mobile Pentium II (Dixon)";
 315                         }
 316                         break;
 317
 318                 case 6:
 319                         if (l2 == 128)
 320                                 p = "Celeron (Mendocino)";
 321                         else if (c->x86_mask == 0 || c->x86_mask == 5)
 322                                 p = "Celeron-A";
 323                         break;
 324
 325                 case 8:
 326                         if (l2 == 128)
 327                                 p = "Celeron (Coppermine)";
 328                         break;
 329                 }
 330
 331                 if (p)
 332                         strcpy(c->x86_model_id, p);
 333         }
 334
 335         if (c->x86 == 15)
 336                 set_cpu_cap(c, X86_FEATURE_P4);
 337         if (c->x86 == 6)
 338                 set_cpu_cap(c, X86_FEATURE_P3);
 339 #endif
 340
 341         if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
 342                 /*
 343                  * let's use the legacy cpuid vector 0x1 and 0x4 for topology
 344                  * detection.
 345                  */
 346                 c->x86_max_cores = intel_num_cpu_cores(c);
 347 #ifdef CONFIG_X86_32
 348                 detect_ht(c);
 349 #endif
 350         }
 351
 352         /* Work around errata */
 353         srat_detect_node();
 354
 355         if (cpu_has(c, X86_FEATURE_VMX))
 356                 detect_vmx_virtcap(c);
 357 }
 358
 359 #ifdef CONFIG_X86_32
 360 static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
 361 {
 362         /*
 363          * Intel PIII Tualatin. This comes in two flavours.
 364          * One has 256kb of cache, the other 512. We have no way
 365          * to determine which, so we use a boottime override
 366          * for the 512kb model, and assume 256 otherwise.
 367          */
 368         if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
 369                 size = 256;
 370         return size;
 371 }
 372 #endif
 373
 374 static struct cpu_dev intel_cpu_dev __cpuinitdata = {
 375         .c_vendor       = "Intel",
 376         .c_ident        = { "GenuineIntel" },
 377 #ifdef CONFIG_X86_32
 378         .c_models = {
 379                 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
 380                   {
 381                           [0] = "486 DX-25/33",
 382                           [1] = "486 DX-50",
 383                           [2] = "486 SX",
 384                           [3] = "486 DX/2",
 385                           [4] = "486 SL",
 386                           [5] = "486 SX/2",
 387                           [7] = "486 DX/2-WB",
 388                           [8] = "486 DX/4",
 389                           [9] = "486 DX/4-WB"
 390                   }
 391                 },
 392                 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
 393                   {
 394                           [0] = "Pentium 60/66 A-step",
 395                           [1] = "Pentium 60/66",
 396                           [2] = "Pentium 75 - 200",
 397                           [3] = "OverDrive PODP5V83",
 398                           [4] = "Pentium MMX",
 399                           [7] = "Mobile Pentium 75 - 200",
 400                           [8] = "Mobile Pentium MMX"
 401                   }
 402                 },
 403                 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
 404                   {
 405                           [0] = "Pentium Pro A-step",
 406                           [1] = "Pentium Pro",
 407                           [3] = "Pentium II (Klamath)",
 408                           [4] = "Pentium II (Deschutes)",
 409                           [5] = "Pentium II (Deschutes)",
 410                           [6] = "Mobile Pentium II",
 411                           [7] = "Pentium III (Katmai)",
 412                           [8] = "Pentium III (Coppermine)",
 413                           [10] = "Pentium III (Cascades)",
 414                           [11] = "Pentium III (Tualatin)",
 415                   }
 416                 },
 417                 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
 418                   {
 419                           [0] = "Pentium 4 (Unknown)",
 420                           [1] = "Pentium 4 (Willamette)",
 421                           [2] = "Pentium 4 (Northwood)",
 422                           [4] = "Pentium 4 (Foster)",
 423                           [5] = "Pentium 4 (Foster)",
 424                   }
 425                 },
 426         },
 427         .c_size_cache   = intel_size_cache,
 428 #endif
 429         .c_early_init   = early_init_intel,
 430         .c_init         = init_intel,
 431         .c_x86_vendor   = X86_VENDOR_INTEL,
 432 };
 433
 434 cpu_dev_register(intel_cpu_dev);
 435