arch/x86/include/asm/cpufeature.h

   1 #ifndef _ASM_X86_CPUFEATURE_H
   2 #define _ASM_X86_CPUFEATURE_H
   3
   4 #include <asm/processor.h>
   5
   6 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
   7
   8 #include <asm/asm.h>
   9 #include <linux/bitops.h>
  10
  11 enum cpuid_leafs
  12 {
  13         CPUID_1_EDX             = 0,
  14         CPUID_8000_0001_EDX,
  15         CPUID_8086_0001_EDX,
  16         CPUID_LNX_1,
  17         CPUID_1_ECX,
  18         CPUID_C000_0001_EDX,
  19         CPUID_8000_0001_ECX,
  20         CPUID_LNX_2,
  21         CPUID_LNX_3,
  22         CPUID_7_0_EBX,
  23         CPUID_D_1_EAX,
  24         CPUID_F_0_EDX,
  25         CPUID_F_1_EDX,
  26         CPUID_8000_0008_EBX,
  27         CPUID_6_EAX,
  28         CPUID_8000_000A_EDX,
  29         CPUID_7_ECX,
  30         CPUID_8000_0007_EBX,
  31         CPUID_7_EDX,
  32 };
  33
  34 #ifdef CONFIG_X86_FEATURE_NAMES
  35 extern const char * const x86_cap_flags[NCAPINTS*32];
  36 extern const char * const x86_power_flags[32];
  37 #define X86_CAP_FMT "%s"
  38 #define x86_cap_flag(flag) x86_cap_flags[flag]
  39 #else
  40 #define X86_CAP_FMT "%d:%d"
  41 #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
  42 #endif
  43
  44 /*
  45  * In order to save room, we index into this array by doing
  46  * X86_BUG_<name> - NCAPINTS*32.
  47  */
  48 extern const char * const x86_bug_flags[NBUGINTS*32];
  49
  50 #define test_cpu_cap(c, bit)                                            \
  51          test_bit(bit, (unsigned long *)((c)->x86_capability))
  52
  53 /*
  54  * There are 32 bits/features in each mask word.  The high bits
  55  * (selected with (bit>>5) give us the word number and the low 5
  56  * bits give us the bit/feature number inside the word.
  57  * (1UL<<((bit)&31) gives us a mask for the feature_bit so we can
  58  * see if it is set in the mask word.
  59  */
  60 #define CHECK_BIT_IN_MASK_WORD(maskname, word, bit)     \
  61         (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word ))
  62
  63 #define REQUIRED_MASK_BIT_SET(feature_bit)              \
  64          ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  0, feature_bit) ||    \
  65            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  1, feature_bit) ||    \
  66            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  2, feature_bit) ||    \
  67            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  3, feature_bit) ||    \
  68            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  4, feature_bit) ||    \
  69            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  5, feature_bit) ||    \
  70            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  6, feature_bit) ||    \
  71            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  7, feature_bit) ||    \
  72            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  8, feature_bit) ||    \
  73            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  9, feature_bit) ||    \
  74            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) ||    \
  75            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) ||    \
  76            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) ||    \
  77            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) ||    \
  78            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) ||    \
  79            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) ||    \
  80            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) ||    \
  81            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) ||    \
  82            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) ||    \
  83            REQUIRED_MASK_CHECK                                    ||    \
  84            BUILD_BUG_ON_ZERO(NCAPINTS != 19))
  85
  86 #define DISABLED_MASK_BIT_SET(feature_bit)                              \
  87          ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  0, feature_bit) ||    \
  88            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  1, feature_bit) ||    \
  89            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  2, feature_bit) ||    \
  90            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  3, feature_bit) ||    \
  91            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  4, feature_bit) ||    \
  92            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  5, feature_bit) ||    \
  93            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  6, feature_bit) ||    \
  94            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  7, feature_bit) ||    \
  95            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  8, feature_bit) ||    \
  96            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  9, feature_bit) ||    \
  97            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) ||    \
  98            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) ||    \
  99            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) ||    \
 100            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) ||    \
 101            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) ||    \
 102            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) ||    \
 103            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) ||    \
 104            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) ||    \
 105            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) ||    \
 106            DISABLED_MASK_CHECK                                    ||    \
 107            BUILD_BUG_ON_ZERO(NCAPINTS != 19))
 108
 109 #define cpu_has(c, bit)                                                 \
 110         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
 111          test_cpu_cap(c, bit))
 112
 113 #define this_cpu_has(bit)                                               \
 114         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
 115          x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
 116
 117 /*
 118  * This macro is for detection of features which need kernel
 119  * infrastructure to be used.  It may *not* directly test the CPU
 120  * itself.  Use the cpu_has() family if you want true runtime
 121  * testing of CPU features, like in hypervisor code where you are
 122  * supporting a possible guest feature where host support for it
 123  * is not relevant.
 124  */
 125 #define cpu_feature_enabled(bit)        \
 126         (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
 127
 128 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
 129
 130 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability))
 131 #define clear_cpu_cap(c, bit)   clear_bit(bit, (unsigned long *)((c)->x86_capability))
 132 #define setup_clear_cpu_cap(bit) do { \
 133         clear_cpu_cap(&boot_cpu_data, bit);     \
 134         set_bit(bit, (unsigned long *)cpu_caps_cleared); \
 135 } while (0)
 136 #define setup_force_cpu_cap(bit) do { \
 137         set_cpu_cap(&boot_cpu_data, bit);       \
 138         set_bit(bit, (unsigned long *)cpu_caps_set);    \
 139 } while (0)
 140
 141 #define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit)
 142
 143 #define cpu_has_fpu             boot_cpu_has(X86_FEATURE_FPU)
 144 #define cpu_has_pse             boot_cpu_has(X86_FEATURE_PSE)
 145 #define cpu_has_tsc             boot_cpu_has(X86_FEATURE_TSC)
 146 #define cpu_has_pge             boot_cpu_has(X86_FEATURE_PGE)
 147 #define cpu_has_apic            boot_cpu_has(X86_FEATURE_APIC)
 148 #define cpu_has_fxsr            boot_cpu_has(X86_FEATURE_FXSR)
 149 #define cpu_has_xmm             boot_cpu_has(X86_FEATURE_XMM)
 150 #define cpu_has_xmm2            boot_cpu_has(X86_FEATURE_XMM2)
 151 #define cpu_has_aes             boot_cpu_has(X86_FEATURE_AES)
 152 #define cpu_has_avx             boot_cpu_has(X86_FEATURE_AVX)
 153 #define cpu_has_avx2            boot_cpu_has(X86_FEATURE_AVX2)
 154 #define cpu_has_clflush         boot_cpu_has(X86_FEATURE_CLFLUSH)
 155 #define cpu_has_gbpages         boot_cpu_has(X86_FEATURE_GBPAGES)
 156 #define cpu_has_arch_perfmon    boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
 157 #define cpu_has_pat             boot_cpu_has(X86_FEATURE_PAT)
 158 #define cpu_has_x2apic          boot_cpu_has(X86_FEATURE_X2APIC)
 159 #define cpu_has_xsave           boot_cpu_has(X86_FEATURE_XSAVE)
 160 #define cpu_has_xsaves          boot_cpu_has(X86_FEATURE_XSAVES)
 161 #define cpu_has_osxsave         boot_cpu_has(X86_FEATURE_OSXSAVE)
 162 #define cpu_has_hypervisor      boot_cpu_has(X86_FEATURE_HYPERVISOR)
 163 /*
 164  * Do not add any more of those clumsy macros - use static_cpu_has() for
 165  * fast paths and boot_cpu_has() otherwise!
 166  */
 167
 168 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
 169 /*
 170  * Static testing of CPU features.  Used the same as boot_cpu_has().
 171  * These will statically patch the target code for additional
 172  * performance.
 173  */
 174 static __always_inline __pure bool _static_cpu_has(u16 bit)
 175 {
 176                 asm_volatile_goto("1: jmp 6f\n"
 177                          "2:\n"
 178                          ".skip -(((5f-4f) - (2b-1b)) > 0) * "
 179                                  "((5f-4f) - (2b-1b)),0x90\n"
 180                          "3:\n"
 181                          ".section .altinstructions,\"a\"\n"
 182                          " .long 1b - .\n"              /* src offset */
 183                          " .long 4f - .\n"              /* repl offset */
 184                          " .word %P1\n"                 /* always replace */
 185                          " .byte 3b - 1b\n"             /* src len */
 186                          " .byte 5f - 4f\n"             /* repl len */
 187                          " .byte 3b - 2b\n"             /* pad len */
 188                          ".previous\n"
 189                          ".section .altinstr_replacement,\"ax\"\n"
 190                          "4: jmp %l[t_no]\n"
 191                          "5:\n"
 192                          ".previous\n"
 193                          ".section .altinstructions,\"a\"\n"
 194                          " .long 1b - .\n"              /* src offset */
 195                          " .long 0\n"                   /* no replacement */
 196                          " .word %P0\n"                 /* feature bit */
 197                          " .byte 3b - 1b\n"             /* src len */
 198                          " .byte 0\n"                   /* repl len */
 199                          " .byte 0\n"                   /* pad len */
 200                          ".previous\n"
 201                          ".section .altinstr_aux,\"ax\"\n"
 202                          "6:\n"
 203                          " testb %[bitnum],%[cap_byte]\n"
 204                          " jnz %l[t_yes]\n"
 205                          " jmp %l[t_no]\n"
 206                          ".previous\n"
 207                          : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
 208                              [bitnum] "i" (1 << (bit & 7)),
 209                              [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
 210                          : : t_yes, t_no);
 211         t_yes:
 212                 return true;
 213         t_no:
 214                 return false;
 215 }
 216
 217 #define static_cpu_has(bit)                                     \
 218 (                                                               \
 219         __builtin_constant_p(boot_cpu_has(bit)) ?               \
 220                 boot_cpu_has(bit) :                             \
 221                 _static_cpu_has(bit)                            \
 222 )
 223 #else
 224 /*
 225  * Fall back to dynamic for gcc versions which don't support asm goto. Should be
 226  * a minority now anyway.
 227  */
 228 #define static_cpu_has(bit)             boot_cpu_has(bit)
 229 #endif
 230
 231 #define cpu_has_bug(c, bit)             cpu_has(c, (bit))
 232 #define set_cpu_bug(c, bit)             set_cpu_cap(c, (bit))
 233 #define clear_cpu_bug(c, bit)           clear_cpu_cap(c, (bit))
 234
 235 #define static_cpu_has_bug(bit)         static_cpu_has((bit))
 236 #define boot_cpu_has_bug(bit)           cpu_has_bug(&boot_cpu_data, (bit))
 237
 238 #define MAX_CPU_FEATURES                (NCAPINTS * 32)
 239 #define cpu_have_feature                boot_cpu_has
 240
 241 #define CPU_FEATURE_TYPEFMT             "x86,ven%04Xfam%04Xmod%04X"
 242 #define CPU_FEATURE_TYPEVAL             boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
 243                                         boot_cpu_data.x86_model
 244
 245 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
 246 #endif /* _ASM_X86_CPUFEATURE_H */