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