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 };
  31
  32 #ifdef CONFIG_X86_FEATURE_NAMES
  33 extern const char * const x86_cap_flags[NCAPINTS*32];
  34 extern const char * const x86_power_flags[32];
  35 #define X86_CAP_FMT "%s"
  36 #define x86_cap_flag(flag) x86_cap_flags[flag]
  37 #else
  38 #define X86_CAP_FMT "%d:%d"
  39 #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
  40 #endif
  41
  42 /*
  43  * In order to save room, we index into this array by doing
  44  * X86_BUG_<name> - NCAPINTS*32.
  45  */
  46 extern const char * const x86_bug_flags[NBUGINTS*32];
  47
  48 #define test_cpu_cap(c, bit)                                            \
  49          test_bit(bit, (unsigned long *)((c)->x86_capability))
  50
  51 #define REQUIRED_MASK_BIT_SET(bit)                                      \
  52          ( (((bit)>>5)==0  && (1UL<<((bit)&31) & REQUIRED_MASK0 )) ||   \
  53            (((bit)>>5)==1  && (1UL<<((bit)&31) & REQUIRED_MASK1 )) ||   \
  54            (((bit)>>5)==2  && (1UL<<((bit)&31) & REQUIRED_MASK2 )) ||   \
  55            (((bit)>>5)==3  && (1UL<<((bit)&31) & REQUIRED_MASK3 )) ||   \
  56            (((bit)>>5)==4  && (1UL<<((bit)&31) & REQUIRED_MASK4 )) ||   \
  57            (((bit)>>5)==5  && (1UL<<((bit)&31) & REQUIRED_MASK5 )) ||   \
  58            (((bit)>>5)==6  && (1UL<<((bit)&31) & REQUIRED_MASK6 )) ||   \
  59            (((bit)>>5)==7  && (1UL<<((bit)&31) & REQUIRED_MASK7 )) ||   \
  60            (((bit)>>5)==8  && (1UL<<((bit)&31) & REQUIRED_MASK8 )) ||   \
  61            (((bit)>>5)==9  && (1UL<<((bit)&31) & REQUIRED_MASK9 )) ||   \
  62            (((bit)>>5)==10 && (1UL<<((bit)&31) & REQUIRED_MASK10)) ||   \
  63            (((bit)>>5)==11 && (1UL<<((bit)&31) & REQUIRED_MASK11)) ||   \
  64            (((bit)>>5)==12 && (1UL<<((bit)&31) & REQUIRED_MASK12)) ||   \
  65            (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK13)) ||   \
  66            (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK14)) ||   \
  67            (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK15)) ||   \
  68            (((bit)>>5)==14 && (1UL<<((bit)&31) & REQUIRED_MASK16)) )
  69
  70 #define DISABLED_MASK_BIT_SET(bit)                                      \
  71          ( (((bit)>>5)==0  && (1UL<<((bit)&31) & DISABLED_MASK0 )) ||   \
  72            (((bit)>>5)==1  && (1UL<<((bit)&31) & DISABLED_MASK1 )) ||   \
  73            (((bit)>>5)==2  && (1UL<<((bit)&31) & DISABLED_MASK2 )) ||   \
  74            (((bit)>>5)==3  && (1UL<<((bit)&31) & DISABLED_MASK3 )) ||   \
  75            (((bit)>>5)==4  && (1UL<<((bit)&31) & DISABLED_MASK4 )) ||   \
  76            (((bit)>>5)==5  && (1UL<<((bit)&31) & DISABLED_MASK5 )) ||   \
  77            (((bit)>>5)==6  && (1UL<<((bit)&31) & DISABLED_MASK6 )) ||   \
  78            (((bit)>>5)==7  && (1UL<<((bit)&31) & DISABLED_MASK7 )) ||   \
  79            (((bit)>>5)==8  && (1UL<<((bit)&31) & DISABLED_MASK8 )) ||   \
  80            (((bit)>>5)==9  && (1UL<<((bit)&31) & DISABLED_MASK9 )) ||   \
  81            (((bit)>>5)==10 && (1UL<<((bit)&31) & DISABLED_MASK10)) ||   \
  82            (((bit)>>5)==11 && (1UL<<((bit)&31) & DISABLED_MASK11)) ||   \
  83            (((bit)>>5)==12 && (1UL<<((bit)&31) & DISABLED_MASK12)) ||   \
  84            (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK13)) ||   \
  85            (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK14)) ||   \
  86            (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK15)) ||   \
  87            (((bit)>>5)==14 && (1UL<<((bit)&31) & DISABLED_MASK16)) )
  88
  89 #define cpu_has(c, bit)                                                 \
  90         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
  91          test_cpu_cap(c, bit))
  92
  93 #define this_cpu_has(bit)                                               \
  94         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
  95          x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
  96
  97 /*
  98  * This macro is for detection of features which need kernel
  99  * infrastructure to be used.  It may *not* directly test the CPU
 100  * itself.  Use the cpu_has() family if you want true runtime
 101  * testing of CPU features, like in hypervisor code where you are
 102  * supporting a possible guest feature where host support for it
 103  * is not relevant.
 104  */
 105 #define cpu_feature_enabled(bit)        \
 106         (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
 107
 108 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
 109
 110 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability))
 111 #define clear_cpu_cap(c, bit)   clear_bit(bit, (unsigned long *)((c)->x86_capability))
 112 #define setup_clear_cpu_cap(bit) do { \
 113         clear_cpu_cap(&boot_cpu_data, bit);     \
 114         set_bit(bit, (unsigned long *)cpu_caps_cleared); \
 115 } while (0)
 116 #define setup_force_cpu_cap(bit) do { \
 117         set_cpu_cap(&boot_cpu_data, bit);       \
 118         set_bit(bit, (unsigned long *)cpu_caps_set);    \
 119 } while (0)
 120
 121 #define cpu_has_xsaves          boot_cpu_has(X86_FEATURE_XSAVES)
 122 /*
 123  * Do not add any more of those clumsy macros - use static_cpu_has() for
 124  * fast paths and boot_cpu_has() otherwise!
 125  */
 126
 127 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
 128 /*
 129  * Static testing of CPU features.  Used the same as boot_cpu_has().
 130  * These will statically patch the target code for additional
 131  * performance.
 132  */
 133 static __always_inline __pure bool _static_cpu_has(u16 bit)
 134 {
 135                 asm_volatile_goto("1: jmp 6f\n"
 136                          "2:\n"
 137                          ".skip -(((5f-4f) - (2b-1b)) > 0) * "
 138                                  "((5f-4f) - (2b-1b)),0x90\n"
 139                          "3:\n"
 140                          ".section .altinstructions,\"a\"\n"
 141                          " .long 1b - .\n"              /* src offset */
 142                          " .long 4f - .\n"              /* repl offset */
 143                          " .word %P1\n"                 /* always replace */
 144                          " .byte 3b - 1b\n"             /* src len */
 145                          " .byte 5f - 4f\n"             /* repl len */
 146                          " .byte 3b - 2b\n"             /* pad len */
 147                          ".previous\n"
 148                          ".section .altinstr_replacement,\"ax\"\n"
 149                          "4: jmp %l[t_no]\n"
 150                          "5:\n"
 151                          ".previous\n"
 152                          ".section .altinstructions,\"a\"\n"
 153                          " .long 1b - .\n"              /* src offset */
 154                          " .long 0\n"                   /* no replacement */
 155                          " .word %P0\n"                 /* feature bit */
 156                          " .byte 3b - 1b\n"             /* src len */
 157                          " .byte 0\n"                   /* repl len */
 158                          " .byte 0\n"                   /* pad len */
 159                          ".previous\n"
 160                          ".section .altinstr_aux,\"ax\"\n"
 161                          "6:\n"
 162                          " testb %[bitnum],%[cap_byte]\n"
 163                          " jnz %l[t_yes]\n"
 164                          " jmp %l[t_no]\n"
 165                          ".previous\n"
 166                          : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
 167                              [bitnum] "i" (1 << (bit & 7)),
 168                              [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
 169                          : : t_yes, t_no);
 170         t_yes:
 171                 return true;
 172         t_no:
 173                 return false;
 174 }
 175
 176 #define static_cpu_has(bit)                                     \
 177 (                                                               \
 178         __builtin_constant_p(boot_cpu_has(bit)) ?               \
 179                 boot_cpu_has(bit) :                             \
 180                 _static_cpu_has(bit)                            \
 181 )
 182 #else
 183 /*
 184  * Fall back to dynamic for gcc versions which don't support asm goto. Should be
 185  * a minority now anyway.
 186  */
 187 #define static_cpu_has(bit)             boot_cpu_has(bit)
 188 #endif
 189
 190 #define cpu_has_bug(c, bit)             cpu_has(c, (bit))
 191 #define set_cpu_bug(c, bit)             set_cpu_cap(c, (bit))
 192 #define clear_cpu_bug(c, bit)           clear_cpu_cap(c, (bit))
 193
 194 #define static_cpu_has_bug(bit)         static_cpu_has((bit))
 195 #define boot_cpu_has_bug(bit)           cpu_has_bug(&boot_cpu_data, (bit))
 196
 197 #define MAX_CPU_FEATURES                (NCAPINTS * 32)
 198 #define cpu_have_feature                boot_cpu_has
 199
 200 #define CPU_FEATURE_TYPEFMT             "x86,ven%04Xfam%04Xmod%04X"
 201 #define CPU_FEATURE_TYPEVAL             boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
 202                                         boot_cpu_data.x86_model
 203
 204 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
 205 #endif /* _ASM_X86_CPUFEATURE_H */