release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/include/asm/cpufeature.h

   1 /*
   2  * Defines x86 CPU feature bits
   3  */
   4 #ifndef _ASM_X86_CPUFEATURE_H
   5 #define _ASM_X86_CPUFEATURE_H
   6
   7 #include <asm/required-features.h>
   8
   9 #define NCAPINTS        10      /* N 32-bit words worth of info */
  10
  11 /*
  12  * Note: If the comment begins with a quoted string, that string is used
  13  * in /proc/cpuinfo instead of the macro name.  If the string is "",
  14  * this feature bit is not displayed in /proc/cpuinfo at all.
  15  */
  16
  17 /* Intel-defined CPU features, CPUID level 0x00000001 (edx), word 0 */
  18 #define X86_FEATURE_FPU         (0*32+ 0) /* Onboard FPU */
  19 #define X86_FEATURE_VME         (0*32+ 1) /* Virtual Mode Extensions */
  20 #define X86_FEATURE_DE          (0*32+ 2) /* Debugging Extensions */
  21 #define X86_FEATURE_PSE         (0*32+ 3) /* Page Size Extensions */
  22 #define X86_FEATURE_TSC         (0*32+ 4) /* Time Stamp Counter */
  23 #define X86_FEATURE_MSR         (0*32+ 5) /* Model-Specific Registers */
  24 #define X86_FEATURE_PAE         (0*32+ 6) /* Physical Address Extensions */
  25 #define X86_FEATURE_MCE         (0*32+ 7) /* Machine Check Exception */
  26 #define X86_FEATURE_CX8         (0*32+ 8) /* CMPXCHG8 instruction */
  27 #define X86_FEATURE_APIC        (0*32+ 9) /* Onboard APIC */
  28 #define X86_FEATURE_SEP         (0*32+11) /* SYSENTER/SYSEXIT */
  29 #define X86_FEATURE_MTRR        (0*32+12) /* Memory Type Range Registers */
  30 #define X86_FEATURE_PGE         (0*32+13) /* Page Global Enable */
  31 #define X86_FEATURE_MCA         (0*32+14) /* Machine Check Architecture */
  32 #define X86_FEATURE_CMOV        (0*32+15) /* CMOV instructions */
  33                                           /* (plus FCMOVcc, FCOMI with FPU) */
  34 #define X86_FEATURE_PAT         (0*32+16) /* Page Attribute Table */
  35 #define X86_FEATURE_PSE36       (0*32+17) /* 36-bit PSEs */
  36 #define X86_FEATURE_PN          (0*32+18) /* Processor serial number */
  37 #define X86_FEATURE_CLFLSH      (0*32+19) /* "clflush" CLFLUSH instruction */
  38 #define X86_FEATURE_DS          (0*32+21) /* "dts" Debug Store */
  39 #define X86_FEATURE_ACPI        (0*32+22) /* ACPI via MSR */
  40 #define X86_FEATURE_MMX         (0*32+23) /* Multimedia Extensions */
  41 #define X86_FEATURE_FXSR        (0*32+24) /* FXSAVE/FXRSTOR, CR4.OSFXSR */
  42 #define X86_FEATURE_XMM         (0*32+25) /* "sse" */
  43 #define X86_FEATURE_XMM2        (0*32+26) /* "sse2" */
  44 #define X86_FEATURE_SELFSNOOP   (0*32+27) /* "ss" CPU self snoop */
  45 #define X86_FEATURE_HT          (0*32+28) /* Hyper-Threading */
  46 #define X86_FEATURE_ACC         (0*32+29) /* "tm" Automatic clock control */
  47 #define X86_FEATURE_IA64        (0*32+30) /* IA-64 processor */
  48 #define X86_FEATURE_PBE         (0*32+31) /* Pending Break Enable */
  49
  50 /* AMD-defined CPU features, CPUID level 0x80000001, word 1 */
  51 /* Don't duplicate feature flags which are redundant with Intel! */
  52 #define X86_FEATURE_SYSCALL     (1*32+11) /* SYSCALL/SYSRET */
  53 #define X86_FEATURE_MP          (1*32+19) /* MP Capable. */
  54 #define X86_FEATURE_NX          (1*32+20) /* Execute Disable */
  55 #define X86_FEATURE_MMXEXT      (1*32+22) /* AMD MMX extensions */
  56 #define X86_FEATURE_FXSR_OPT    (1*32+25) /* FXSAVE/FXRSTOR optimizations */
  57 #define X86_FEATURE_GBPAGES     (1*32+26) /* "pdpe1gb" GB pages */
  58 #define X86_FEATURE_RDTSCP      (1*32+27) /* RDTSCP */
  59 #define X86_FEATURE_LM          (1*32+29) /* Long Mode (x86-64) */
  60 #define X86_FEATURE_3DNOWEXT    (1*32+30) /* AMD 3DNow! extensions */
  61 #define X86_FEATURE_3DNOW       (1*32+31) /* 3DNow! */
  62
  63 /* Transmeta-defined CPU features, CPUID level 0x80860001, word 2 */
  64 #define X86_FEATURE_RECOVERY    (2*32+ 0) /* CPU in recovery mode */
  65 #define X86_FEATURE_LONGRUN     (2*32+ 1) /* Longrun power control */
  66 #define X86_FEATURE_LRTI        (2*32+ 3) /* LongRun table interface */
  67
  68 /* Other features, Linux-defined mapping, word 3 */
  69 /* This range is used for feature bits which conflict or are synthesized */
  70 #define X86_FEATURE_CXMMX       (3*32+ 0) /* Cyrix MMX extensions */
  71 #define X86_FEATURE_K6_MTRR     (3*32+ 1) /* AMD K6 nonstandard MTRRs */
  72 #define X86_FEATURE_CYRIX_ARR   (3*32+ 2) /* Cyrix ARRs (= MTRRs) */
  73 #define X86_FEATURE_CENTAUR_MCR (3*32+ 3) /* Centaur MCRs (= MTRRs) */
  74 /* cpu types for specific tunings: */
  75 #define X86_FEATURE_K8          (3*32+ 4) /* "" Opteron, Athlon64 */
  76 #define X86_FEATURE_K7          (3*32+ 5) /* "" Athlon */
  77 #define X86_FEATURE_P3          (3*32+ 6) /* "" P3 */
  78 #define X86_FEATURE_P4          (3*32+ 7) /* "" P4 */
  79 #define X86_FEATURE_CONSTANT_TSC (3*32+ 8) /* TSC ticks at a constant rate */
  80 #define X86_FEATURE_UP          (3*32+ 9) /* smp kernel running on up */
  81 #define X86_FEATURE_FXSAVE_LEAK (3*32+10) /* "" FXSAVE leaks FOP/FIP/FOP */
  82 #define X86_FEATURE_ARCH_PERFMON (3*32+11) /* Intel Architectural PerfMon */
  83 #define X86_FEATURE_PEBS        (3*32+12) /* Precise-Event Based Sampling */
  84 #define X86_FEATURE_BTS         (3*32+13) /* Branch Trace Store */
  85 #define X86_FEATURE_SYSCALL32   (3*32+14) /* "" syscall in ia32 userspace */
  86 #define X86_FEATURE_SYSENTER32  (3*32+15) /* "" sysenter in ia32 userspace */
  87 #define X86_FEATURE_REP_GOOD    (3*32+16) /* rep microcode works well */
  88 #define X86_FEATURE_MFENCE_RDTSC (3*32+17) /* "" Mfence synchronizes RDTSC */
  89 #define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* "" Lfence synchronizes RDTSC */
  90 #define X86_FEATURE_11AP        (3*32+19) /* "" Bad local APIC aka 11AP */
  91 #define X86_FEATURE_NOPL        (3*32+20) /* The NOPL (0F 1F) instructions */
  92                                           /* 21 available, was AMD_C1E */
  93 #define X86_FEATURE_XTOPOLOGY   (3*32+22) /* cpu topology enum extensions */
  94 #define X86_FEATURE_TSC_RELIABLE (3*32+23) /* TSC is known to be reliable */
  95 #define X86_FEATURE_NONSTOP_TSC (3*32+24) /* TSC does not stop in C states */
  96 #define X86_FEATURE_CLFLUSH_MONITOR (3*32+25) /* "" clflush reqd with monitor */
  97 #define X86_FEATURE_EXTD_APICID (3*32+26) /* has extended APICID (8 bits) */
  98 #define X86_FEATURE_AMD_DCM     (3*32+27) /* multi-node processor */
  99 #define X86_FEATURE_APERFMPERF  (3*32+28) /* APERFMPERF */
 100
 101 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 102 #define X86_FEATURE_XMM3        (4*32+ 0) /* "pni" SSE-3 */
 103 #define X86_FEATURE_PCLMULQDQ   (4*32+ 1) /* PCLMULQDQ instruction */
 104 #define X86_FEATURE_DTES64      (4*32+ 2) /* 64-bit Debug Store */
 105 #define X86_FEATURE_MWAIT       (4*32+ 3) /* "monitor" Monitor/Mwait support */
 106 #define X86_FEATURE_DSCPL       (4*32+ 4) /* "ds_cpl" CPL Qual. Debug Store */
 107 #define X86_FEATURE_VMX         (4*32+ 5) /* Hardware virtualization */
 108 #define X86_FEATURE_SMX         (4*32+ 6) /* Safer mode */
 109 #define X86_FEATURE_EST         (4*32+ 7) /* Enhanced SpeedStep */
 110 #define X86_FEATURE_TM2         (4*32+ 8) /* Thermal Monitor 2 */
 111 #define X86_FEATURE_SSSE3       (4*32+ 9) /* Supplemental SSE-3 */
 112 #define X86_FEATURE_CID         (4*32+10) /* Context ID */
 113 #define X86_FEATURE_FMA         (4*32+12) /* Fused multiply-add */
 114 #define X86_FEATURE_CX16        (4*32+13) /* CMPXCHG16B */
 115 #define X86_FEATURE_XTPR        (4*32+14) /* Send Task Priority Messages */
 116 #define X86_FEATURE_PDCM        (4*32+15) /* Performance Capabilities */
 117 #define X86_FEATURE_DCA         (4*32+18) /* Direct Cache Access */
 118 #define X86_FEATURE_XMM4_1      (4*32+19) /* "sse4_1" SSE-4.1 */
 119 #define X86_FEATURE_XMM4_2      (4*32+20) /* "sse4_2" SSE-4.2 */
 120 #define X86_FEATURE_X2APIC      (4*32+21) /* x2APIC */
 121 #define X86_FEATURE_MOVBE       (4*32+22) /* MOVBE instruction */
 122 #define X86_FEATURE_POPCNT      (4*32+23) /* POPCNT instruction */
 123 #define X86_FEATURE_AES         (4*32+25) /* AES instructions */
 124 #define X86_FEATURE_XSAVE       (4*32+26) /* XSAVE/XRSTOR/XSETBV/XGETBV */
 125 #define X86_FEATURE_OSXSAVE     (4*32+27) /* "" XSAVE enabled in the OS */
 126 #define X86_FEATURE_AVX         (4*32+28) /* Advanced Vector Extensions */
 127 #define X86_FEATURE_F16C        (4*32+29) /* 16-bit fp conversions */
 128 #define X86_FEATURE_RDRND       (4*32+30) /* The RDRAND instruction */
 129 #define X86_FEATURE_HYPERVISOR  (4*32+31) /* Running on a hypervisor */
 130
 131 /* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */
 132 #define X86_FEATURE_XSTORE      (5*32+ 2) /* "rng" RNG present (xstore) */
 133 #define X86_FEATURE_XSTORE_EN   (5*32+ 3) /* "rng_en" RNG enabled */
 134 #define X86_FEATURE_XCRYPT      (5*32+ 6) /* "ace" on-CPU crypto (xcrypt) */
 135 #define X86_FEATURE_XCRYPT_EN   (5*32+ 7) /* "ace_en" on-CPU crypto enabled */
 136 #define X86_FEATURE_ACE2        (5*32+ 8) /* Advanced Cryptography Engine v2 */
 137 #define X86_FEATURE_ACE2_EN     (5*32+ 9) /* ACE v2 enabled */
 138 #define X86_FEATURE_PHE         (5*32+10) /* PadLock Hash Engine */
 139 #define X86_FEATURE_PHE_EN      (5*32+11) /* PHE enabled */
 140 #define X86_FEATURE_PMM         (5*32+12) /* PadLock Montgomery Multiplier */
 141 #define X86_FEATURE_PMM_EN      (5*32+13) /* PMM enabled */
 142
 143 /* More extended AMD flags: CPUID level 0x80000001, ecx, word 6 */
 144 #define X86_FEATURE_LAHF_LM     (6*32+ 0) /* LAHF/SAHF in long mode */
 145 #define X86_FEATURE_CMP_LEGACY  (6*32+ 1) /* If yes HyperThreading not valid */
 146 #define X86_FEATURE_SVM         (6*32+ 2) /* Secure virtual machine */
 147 #define X86_FEATURE_EXTAPIC     (6*32+ 3) /* Extended APIC space */
 148 #define X86_FEATURE_CR8_LEGACY  (6*32+ 4) /* CR8 in 32-bit mode */
 149 #define X86_FEATURE_ABM         (6*32+ 5) /* Advanced bit manipulation */
 150 #define X86_FEATURE_SSE4A       (6*32+ 6) /* SSE-4A */
 151 #define X86_FEATURE_MISALIGNSSE (6*32+ 7) /* Misaligned SSE mode */
 152 #define X86_FEATURE_3DNOWPREFETCH (6*32+ 8) /* 3DNow prefetch instructions */
 153 #define X86_FEATURE_OSVW        (6*32+ 9)
 154 #define X86_FEATURE_IBS         (6*32+10) /* Instruction Based Sampling */
 155 #define X86_FEATURE_XOP         (6*32+11) /* extended AVX instructions */
 156 #define X86_FEATURE_SKINIT      (6*32+12) /* SKINIT/STGI instructions */
 157 #define X86_FEATURE_WDT         (6*32+13) /* Watchdog timer */
 158 #define X86_FEATURE_NODEID_MSR  (6*32+19) /* NodeId MSR */
 159
 160 /*
 161  * Auxiliary flags: Linux defined - For features scattered in various
 162  * CPUID levels like 0x6, 0xA etc, word 7
 163  */
 164 #define X86_FEATURE_IDA         (7*32+ 0) /* Intel Dynamic Acceleration */
 165 #define X86_FEATURE_ARAT        (7*32+ 1) /* Always Running APIC Timer */
 166 #define X86_FEATURE_CPB         (7*32+ 2) /* AMD Core Performance Boost */
 167 #define X86_FEATURE_EPB         (7*32+ 3) /* IA32_ENERGY_PERF_BIAS support */
 168 #define X86_FEATURE_XSAVEOPT    (7*32+ 4) /* Optimized Xsave */
 169 #define X86_FEATURE_PLN         (7*32+ 5) /* Intel Power Limit Notification */
 170 #define X86_FEATURE_PTS         (7*32+ 6) /* Intel Package Thermal Status */
 171 #define X86_FEATURE_DTS         (7*32+ 7) /* Digital Thermal Sensor */
 172
 173 /* Virtualization flags: Linux defined, word 8 */
 174 #define X86_FEATURE_TPR_SHADOW  (8*32+ 0) /* Intel TPR Shadow */
 175 #define X86_FEATURE_VNMI        (8*32+ 1) /* Intel Virtual NMI */
 176 #define X86_FEATURE_FLEXPRIORITY (8*32+ 2) /* Intel FlexPriority */
 177 #define X86_FEATURE_EPT         (8*32+ 3) /* Intel Extended Page Table */
 178 #define X86_FEATURE_VPID        (8*32+ 4) /* Intel Virtual Processor ID */
 179 #define X86_FEATURE_NPT         (8*32+ 5) /* AMD Nested Page Table support */
 180 #define X86_FEATURE_LBRV        (8*32+ 6) /* AMD LBR Virtualization support */
 181 #define X86_FEATURE_SVML        (8*32+ 7) /* "svm_lock" AMD SVM locking MSR */
 182 #define X86_FEATURE_NRIPS       (8*32+ 8) /* "nrip_save" AMD SVM next_rip save */
 183
 184 /* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 9 */
 185 #define X86_FEATURE_FSGSBASE    (9*32+ 0) /* {RD/WR}{FS/GS}BASE instructions*/
 186
 187 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 188
 189 #include <asm/asm.h>
 190 #include <linux/bitops.h>
 191
 192 extern const char * const x86_cap_flags[NCAPINTS*32];
 193 extern const char * const x86_power_flags[32];
 194
 195 #define test_cpu_cap(c, bit)                                            \
 196          test_bit(bit, (unsigned long *)((c)->x86_capability))
 197
 198 #define cpu_has(c, bit)                                                 \
 199         (__builtin_constant_p(bit) &&                                   \
 200          ( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0)) ||     \
 201            (((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1)) ||     \
 202            (((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2)) ||     \
 203            (((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3)) ||     \
 204            (((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4)) ||     \
 205            (((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5)) ||     \
 206            (((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6)) ||     \
 207            (((bit)>>5)==7 && (1UL<<((bit)&31) & REQUIRED_MASK7)) ||     \
 208            (((bit)>>5)==8 && (1UL<<((bit)&31) & REQUIRED_MASK8)) ||     \
 209            (((bit)>>5)==9 && (1UL<<((bit)&31) & REQUIRED_MASK9)) )      \
 210           ? 1 :                                                         \
 211          test_cpu_cap(c, bit))
 212
 213 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
 214
 215 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability))
 216 #define clear_cpu_cap(c, bit)   clear_bit(bit, (unsigned long *)((c)->x86_capability))
 217 #define setup_clear_cpu_cap(bit) do { \
 218         clear_cpu_cap(&boot_cpu_data, bit);     \
 219         set_bit(bit, (unsigned long *)cpu_caps_cleared); \
 220 } while (0)
 221 #define setup_force_cpu_cap(bit) do { \
 222         set_cpu_cap(&boot_cpu_data, bit);       \
 223         set_bit(bit, (unsigned long *)cpu_caps_set);    \
 224 } while (0)
 225
 226 #define cpu_has_fpu             boot_cpu_has(X86_FEATURE_FPU)
 227 #define cpu_has_vme             boot_cpu_has(X86_FEATURE_VME)
 228 #define cpu_has_de              boot_cpu_has(X86_FEATURE_DE)
 229 #define cpu_has_pse             boot_cpu_has(X86_FEATURE_PSE)
 230 #define cpu_has_tsc             boot_cpu_has(X86_FEATURE_TSC)
 231 #define cpu_has_pae             boot_cpu_has(X86_FEATURE_PAE)
 232 #define cpu_has_pge             boot_cpu_has(X86_FEATURE_PGE)
 233 #define cpu_has_apic            boot_cpu_has(X86_FEATURE_APIC)
 234 #define cpu_has_sep             boot_cpu_has(X86_FEATURE_SEP)
 235 #define cpu_has_mtrr            boot_cpu_has(X86_FEATURE_MTRR)
 236 #define cpu_has_mmx             boot_cpu_has(X86_FEATURE_MMX)
 237 #define cpu_has_fxsr            boot_cpu_has(X86_FEATURE_FXSR)
 238 #define cpu_has_xmm             boot_cpu_has(X86_FEATURE_XMM)
 239 #define cpu_has_xmm2            boot_cpu_has(X86_FEATURE_XMM2)
 240 #define cpu_has_xmm3            boot_cpu_has(X86_FEATURE_XMM3)
 241 #define cpu_has_aes             boot_cpu_has(X86_FEATURE_AES)
 242 #define cpu_has_ht              boot_cpu_has(X86_FEATURE_HT)
 243 #define cpu_has_mp              boot_cpu_has(X86_FEATURE_MP)
 244 #define cpu_has_nx              boot_cpu_has(X86_FEATURE_NX)
 245 #define cpu_has_k6_mtrr         boot_cpu_has(X86_FEATURE_K6_MTRR)
 246 #define cpu_has_cyrix_arr       boot_cpu_has(X86_FEATURE_CYRIX_ARR)
 247 #define cpu_has_centaur_mcr     boot_cpu_has(X86_FEATURE_CENTAUR_MCR)
 248 #define cpu_has_xstore          boot_cpu_has(X86_FEATURE_XSTORE)
 249 #define cpu_has_xstore_enabled  boot_cpu_has(X86_FEATURE_XSTORE_EN)
 250 #define cpu_has_xcrypt          boot_cpu_has(X86_FEATURE_XCRYPT)
 251 #define cpu_has_xcrypt_enabled  boot_cpu_has(X86_FEATURE_XCRYPT_EN)
 252 #define cpu_has_ace2            boot_cpu_has(X86_FEATURE_ACE2)
 253 #define cpu_has_ace2_enabled    boot_cpu_has(X86_FEATURE_ACE2_EN)
 254 #define cpu_has_phe             boot_cpu_has(X86_FEATURE_PHE)
 255 #define cpu_has_phe_enabled     boot_cpu_has(X86_FEATURE_PHE_EN)
 256 #define cpu_has_pmm             boot_cpu_has(X86_FEATURE_PMM)
 257 #define cpu_has_pmm_enabled     boot_cpu_has(X86_FEATURE_PMM_EN)
 258 #define cpu_has_ds              boot_cpu_has(X86_FEATURE_DS)
 259 #define cpu_has_pebs            boot_cpu_has(X86_FEATURE_PEBS)
 260 #define cpu_has_clflush         boot_cpu_has(X86_FEATURE_CLFLSH)
 261 #define cpu_has_bts             boot_cpu_has(X86_FEATURE_BTS)
 262 #define cpu_has_gbpages         boot_cpu_has(X86_FEATURE_GBPAGES)
 263 #define cpu_has_arch_perfmon    boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
 264 #define cpu_has_pat             boot_cpu_has(X86_FEATURE_PAT)
 265 #define cpu_has_xmm4_1          boot_cpu_has(X86_FEATURE_XMM4_1)
 266 #define cpu_has_xmm4_2          boot_cpu_has(X86_FEATURE_XMM4_2)
 267 #define cpu_has_x2apic          boot_cpu_has(X86_FEATURE_X2APIC)
 268 #define cpu_has_xsave           boot_cpu_has(X86_FEATURE_XSAVE)
 269 #define cpu_has_hypervisor      boot_cpu_has(X86_FEATURE_HYPERVISOR)
 270 #define cpu_has_pclmulqdq       boot_cpu_has(X86_FEATURE_PCLMULQDQ)
 271
 272 #if defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_64)
 273 # define cpu_has_invlpg         1
 274 #else
 275 # define cpu_has_invlpg         (boot_cpu_data.x86 > 3)
 276 #endif
 277
 278 #ifdef CONFIG_X86_64
 279
 280 #undef  cpu_has_vme
 281 #define cpu_has_vme             0
 282
 283 #undef  cpu_has_pae
 284 #define cpu_has_pae             ___BUG___
 285
 286 #undef  cpu_has_mp
 287 #define cpu_has_mp              1
 288
 289 #undef  cpu_has_k6_mtrr
 290 #define cpu_has_k6_mtrr         0
 291
 292 #undef  cpu_has_cyrix_arr
 293 #define cpu_has_cyrix_arr       0
 294
 295 #undef  cpu_has_centaur_mcr
 296 #define cpu_has_centaur_mcr     0
 297
 298 #endif /* CONFIG_X86_64 */
 299
 300 #if __GNUC__ >= 4
 301 /*
 302  * Static testing of CPU features.  Used the same as boot_cpu_has().
 303  * These are only valid after alternatives have run, but will statically
 304  * patch the target code for additional performance.
 305  *
 306  */
 307 static __always_inline __pure bool __static_cpu_has(u16 bit)
 308 {
 309 #if __GNUC__ > 4 || __GNUC_MINOR__ >= 5
 310                 asm goto("1: jmp %l[t_no]\n"
 311                          "2:\n"
 312                          ".section .altinstructions,\"a\"\n"
 313                          _ASM_ALIGN "\n"
 314                          _ASM_PTR "1b\n"
 315                          _ASM_PTR "0\n"         /* no replacement */
 316                          " .word %P0\n"         /* feature bit */
 317                          " .byte 2b - 1b\n"     /* source len */
 318                          " .byte 0\n"           /* replacement len */
 319                          ".previous\n"
 320                          /* skipping size check since replacement size = 0 */
 321                          : : "i" (bit) : : t_no);
 322                 return true;
 323         t_no:
 324                 return false;
 325 #else
 326                 u8 flag;
 327                 /* Open-coded due to __stringify() in ALTERNATIVE() */
 328                 asm volatile("1: movb $0,%0\n"
 329                              "2:\n"
 330                              ".section .altinstructions,\"a\"\n"
 331                              _ASM_ALIGN "\n"
 332                              _ASM_PTR "1b\n"
 333                              _ASM_PTR "3f\n"
 334                              " .word %P1\n"             /* feature bit */
 335                              " .byte 2b - 1b\n"         /* source len */
 336                              " .byte 4f - 3f\n"         /* replacement len */
 337                              ".previous\n"
 338                              ".section .discard,\"aw\",@progbits\n"
 339                              " .byte 0xff + (4f-3f) - (2b-1b)\n" /* size check */
 340                              ".previous\n"
 341                              ".section .altinstr_replacement,\"ax\"\n"
 342                              "3: movb $1,%0\n"
 343                              "4:\n"
 344                              ".previous\n"
 345                              : "=qm" (flag) : "i" (bit));
 346                 return flag;
 347 #endif
 348 }
 349
 350 #define static_cpu_has(bit)                                     \
 351 (                                                               \
 352         __builtin_constant_p(boot_cpu_has(bit)) ?               \
 353                 boot_cpu_has(bit) :                             \
 354         __builtin_constant_p(bit) ?                             \
 355                 __static_cpu_has(bit) :                         \
 356                 boot_cpu_has(bit)                               \
 357 )
 358 #else
 359 /*
 360  * gcc 3.x is too stupid to do the static test; fall back to dynamic.
 361  */
 362 #define static_cpu_has(bit) boot_cpu_has(bit)
 363 #endif
 364
 365 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
 366
 367 #endif /* _ASM_X86_CPUFEATURE_H */