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 };
  30
  31 #ifdef CONFIG_X86_FEATURE_NAMES
  32 extern const char * const x86_cap_flags[NCAPINTS*32];
  33 extern const char * const x86_power_flags[32];
  34 #define X86_CAP_FMT "%s"
  35 #define x86_cap_flag(flag) x86_cap_flags[flag]
  36 #else
  37 #define X86_CAP_FMT "%d:%d"
  38 #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
  39 #endif
  40
  41 /*
  42  * In order to save room, we index into this array by doing
  43  * X86_BUG_<name> - NCAPINTS*32.
  44  */
  45 extern const char * const x86_bug_flags[NBUGINTS*32];
  46
  47 #define test_cpu_cap(c, bit)                                            \
  48          test_bit(bit, (unsigned long *)((c)->x86_capability))
  49
  50 #define REQUIRED_MASK_BIT_SET(bit)                                      \
  51          ( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0)) ||     \
  52            (((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1)) ||     \
  53            (((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2)) ||     \
  54            (((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3)) ||     \
  55            (((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4)) ||     \
  56            (((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5)) ||     \
  57            (((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6)) ||     \
  58            (((bit)>>5)==7 && (1UL<<((bit)&31) & REQUIRED_MASK7)) ||     \
  59            (((bit)>>5)==8 && (1UL<<((bit)&31) & REQUIRED_MASK8)) ||     \
  60            (((bit)>>5)==9 && (1UL<<((bit)&31) & REQUIRED_MASK9)) )
  61
  62 #define DISABLED_MASK_BIT_SET(bit)                                      \
  63          ( (((bit)>>5)==0 && (1UL<<((bit)&31) & DISABLED_MASK0)) ||     \
  64            (((bit)>>5)==1 && (1UL<<((bit)&31) & DISABLED_MASK1)) ||     \
  65            (((bit)>>5)==2 && (1UL<<((bit)&31) & DISABLED_MASK2)) ||     \
  66            (((bit)>>5)==3 && (1UL<<((bit)&31) & DISABLED_MASK3)) ||     \
  67            (((bit)>>5)==4 && (1UL<<((bit)&31) & DISABLED_MASK4)) ||     \
  68            (((bit)>>5)==5 && (1UL<<((bit)&31) & DISABLED_MASK5)) ||     \
  69            (((bit)>>5)==6 && (1UL<<((bit)&31) & DISABLED_MASK6)) ||     \
  70            (((bit)>>5)==7 && (1UL<<((bit)&31) & DISABLED_MASK7)) ||     \
  71            (((bit)>>5)==8 && (1UL<<((bit)&31) & DISABLED_MASK8)) ||     \
  72            (((bit)>>5)==9 && (1UL<<((bit)&31) & DISABLED_MASK9)) )
  73
  74 #define cpu_has(c, bit)                                                 \
  75         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
  76          test_cpu_cap(c, bit))
  77
  78 #define this_cpu_has(bit)                                               \
  79         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
  80          x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
  81
  82 /*
  83  * This macro is for detection of features which need kernel
  84  * infrastructure to be used.  It may *not* directly test the CPU
  85  * itself.  Use the cpu_has() family if you want true runtime
  86  * testing of CPU features, like in hypervisor code where you are
  87  * supporting a possible guest feature where host support for it
  88  * is not relevant.
  89  */
  90 #define cpu_feature_enabled(bit)        \
  91         (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 :  \
  92          cpu_has(&boot_cpu_data, bit))
  93
  94 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
  95
  96 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability))
  97 #define clear_cpu_cap(c, bit)   clear_bit(bit, (unsigned long *)((c)->x86_capability))
  98 #define setup_clear_cpu_cap(bit) do { \
  99         clear_cpu_cap(&boot_cpu_data, bit);     \
 100         set_bit(bit, (unsigned long *)cpu_caps_cleared); \
 101 } while (0)
 102 #define setup_force_cpu_cap(bit) do { \
 103         set_cpu_cap(&boot_cpu_data, bit);       \
 104         set_bit(bit, (unsigned long *)cpu_caps_set);    \
 105 } while (0)
 106
 107 #define cpu_has_fpu             boot_cpu_has(X86_FEATURE_FPU)
 108 #define cpu_has_pse             boot_cpu_has(X86_FEATURE_PSE)
 109 #define cpu_has_tsc             boot_cpu_has(X86_FEATURE_TSC)
 110 #define cpu_has_pge             boot_cpu_has(X86_FEATURE_PGE)
 111 #define cpu_has_apic            boot_cpu_has(X86_FEATURE_APIC)
 112 #define cpu_has_fxsr            boot_cpu_has(X86_FEATURE_FXSR)
 113 #define cpu_has_xmm             boot_cpu_has(X86_FEATURE_XMM)
 114 #define cpu_has_xmm2            boot_cpu_has(X86_FEATURE_XMM2)
 115 #define cpu_has_aes             boot_cpu_has(X86_FEATURE_AES)
 116 #define cpu_has_avx             boot_cpu_has(X86_FEATURE_AVX)
 117 #define cpu_has_avx2            boot_cpu_has(X86_FEATURE_AVX2)
 118 #define cpu_has_clflush         boot_cpu_has(X86_FEATURE_CLFLUSH)
 119 #define cpu_has_gbpages         boot_cpu_has(X86_FEATURE_GBPAGES)
 120 #define cpu_has_arch_perfmon    boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
 121 #define cpu_has_pat             boot_cpu_has(X86_FEATURE_PAT)
 122 #define cpu_has_x2apic          boot_cpu_has(X86_FEATURE_X2APIC)
 123 #define cpu_has_xsave           boot_cpu_has(X86_FEATURE_XSAVE)
 124 #define cpu_has_xsaves          boot_cpu_has(X86_FEATURE_XSAVES)
 125 #define cpu_has_osxsave         boot_cpu_has(X86_FEATURE_OSXSAVE)
 126 #define cpu_has_hypervisor      boot_cpu_has(X86_FEATURE_HYPERVISOR)
 127 /*
 128  * Do not add any more of those clumsy macros - use static_cpu_has() for
 129  * fast paths and boot_cpu_has() otherwise!
 130  */
 131
 132 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
 133 /*
 134  * Static testing of CPU features.  Used the same as boot_cpu_has().
 135  * These will statically patch the target code for additional
 136  * performance.
 137  */
 138 static __always_inline __pure bool _static_cpu_has(u16 bit)
 139 {
 140                 asm_volatile_goto("1: jmp 6f\n"
 141                          "2:\n"
 142                          ".skip -(((5f-4f) - (2b-1b)) > 0) * "
 143                                  "((5f-4f) - (2b-1b)),0x90\n"
 144                          "3:\n"
 145                          ".section .altinstructions,\"a\"\n"
 146                          " .long 1b - .\n"              /* src offset */
 147                          " .long 4f - .\n"              /* repl offset */
 148                          " .word %P1\n"                 /* always replace */
 149                          " .byte 3b - 1b\n"             /* src len */
 150                          " .byte 5f - 4f\n"             /* repl len */
 151                          " .byte 3b - 2b\n"             /* pad len */
 152                          ".previous\n"
 153                          ".section .altinstr_replacement,\"ax\"\n"
 154                          "4: jmp %l[t_no]\n"
 155                          "5:\n"
 156                          ".previous\n"
 157                          ".section .altinstructions,\"a\"\n"
 158                          " .long 1b - .\n"              /* src offset */
 159                          " .long 0\n"                   /* no replacement */
 160                          " .word %P0\n"                 /* feature bit */
 161                          " .byte 3b - 1b\n"             /* src len */
 162                          " .byte 0\n"                   /* repl len */
 163                          " .byte 0\n"                   /* pad len */
 164                          ".previous\n"
 165                          ".section .altinstr_aux,\"ax\"\n"
 166                          "6:\n"
 167                          " testb %[bitnum],%[cap_byte]\n"
 168                          " jnz %l[t_yes]\n"
 169                          " jmp %l[t_no]\n"
 170                          ".previous\n"
 171                          : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
 172                              [bitnum] "i" (1 << (bit & 7)),
 173                              [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
 174                          : : t_yes, t_no);
 175         t_yes:
 176                 return true;
 177         t_no:
 178                 return false;
 179 }
 180
 181 #define static_cpu_has(bit)                                     \
 182 (                                                               \
 183         __builtin_constant_p(boot_cpu_has(bit)) ?               \
 184                 boot_cpu_has(bit) :                             \
 185                 _static_cpu_has(bit)                            \
 186 )
 187 #else
 188 /*
 189  * Fall back to dynamic for gcc versions which don't support asm goto. Should be
 190  * a minority now anyway.
 191  */
 192 #define static_cpu_has(bit)             boot_cpu_has(bit)
 193 #endif
 194
 195 #define cpu_has_bug(c, bit)             cpu_has(c, (bit))
 196 #define set_cpu_bug(c, bit)             set_cpu_cap(c, (bit))
 197 #define clear_cpu_bug(c, bit)           clear_cpu_cap(c, (bit))
 198
 199 #define static_cpu_has_bug(bit)         static_cpu_has((bit))
 200 #define boot_cpu_has_bug(bit)           cpu_has_bug(&boot_cpu_data, (bit))
 201
 202 #define MAX_CPU_FEATURES                (NCAPINTS * 32)
 203 #define cpu_have_feature                boot_cpu_has
 204
 205 #define CPU_FEATURE_TYPEFMT             "x86,ven%04Xfam%04Xmod%04X"
 206 #define CPU_FEATURE_TYPEVAL             boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
 207                                         boot_cpu_data.x86_model
 208
 209 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
 210 #endif /* _ASM_X86_CPUFEATURE_H */