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 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS) 139 /* 140 * Static testing of CPU features. Used the same as boot_cpu_has(). 141 * These will statically patch the target code for additional 142 * performance. 143 */ 144 static __always_inline __pure bool _static_cpu_has(u16 bit) 145 { 146 asm_volatile_goto("1: jmp 6f\n" 147 "2:\n" 148 ".skip -(((5f-4f) - (2b-1b)) > 0) * " 149 "((5f-4f) - (2b-1b)),0x90\n" 150 "3:\n" 151 ".section .altinstructions,\"a\"\n" 152 " .long 1b - .\n" /* src offset */ 153 " .long 4f - .\n" /* repl offset */ 154 " .word %P1\n" /* always replace */ 155 " .byte 3b - 1b\n" /* src len */ 156 " .byte 5f - 4f\n" /* repl len */ 157 " .byte 3b - 2b\n" /* pad len */ 158 ".previous\n" 159 ".section .altinstr_replacement,\"ax\"\n" 160 "4: jmp %l[t_no]\n" 161 "5:\n" 162 ".previous\n" 163 ".section .altinstructions,\"a\"\n" 164 " .long 1b - .\n" /* src offset */ 165 " .long 0\n" /* no replacement */ 166 " .word %P0\n" /* feature bit */ 167 " .byte 3b - 1b\n" /* src len */ 168 " .byte 0\n" /* repl len */ 169 " .byte 0\n" /* pad len */ 170 ".previous\n" 171 ".section .altinstr_aux,\"ax\"\n" 172 "6:\n" 173 " testb %[bitnum],%[cap_byte]\n" 174 " jnz %l[t_yes]\n" 175 " jmp %l[t_no]\n" 176 ".previous\n" 177 : : "i" (bit), "i" (X86_FEATURE_ALWAYS), 178 [bitnum] "i" (1 << (bit & 7)), 179 [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3]) 180 : : t_yes, t_no); 181 t_yes: 182 return true; 183 t_no: 184 return false; 185 } 186 187 #define static_cpu_has(bit) \ 188 ( \ 189 __builtin_constant_p(boot_cpu_has(bit)) ? \ 190 boot_cpu_has(bit) : \ 191 _static_cpu_has(bit) \ 192 ) 193 #else 194 /* 195 * Fall back to dynamic for gcc versions which don't support asm goto. Should be 196 * a minority now anyway. 197 */ 198 #define static_cpu_has(bit) boot_cpu_has(bit) 199 #endif 200 201 #define cpu_has_bug(c, bit) cpu_has(c, (bit)) 202 #define set_cpu_bug(c, bit) set_cpu_cap(c, (bit)) 203 #define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit)) 204 205 #define static_cpu_has_bug(bit) static_cpu_has((bit)) 206 #define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit)) 207 #define boot_cpu_set_bug(bit) set_cpu_cap(&boot_cpu_data, (bit)) 208 209 #define MAX_CPU_FEATURES (NCAPINTS * 32) 210 #define cpu_have_feature boot_cpu_has 211 212 #define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X" 213 #define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \ 214 boot_cpu_data.x86_model 215 216 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */ 217 #endif /* _ASM_X86_CPUFEATURE_H */ 218