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_fpu boot_cpu_has(X86_FEATURE_FPU) 122 #define cpu_has_pse boot_cpu_has(X86_FEATURE_PSE) 123 #define cpu_has_tsc boot_cpu_has(X86_FEATURE_TSC) 124 #define cpu_has_pge boot_cpu_has(X86_FEATURE_PGE) 125 #define cpu_has_apic boot_cpu_has(X86_FEATURE_APIC) 126 #define cpu_has_fxsr boot_cpu_has(X86_FEATURE_FXSR) 127 #define cpu_has_xmm boot_cpu_has(X86_FEATURE_XMM) 128 #define cpu_has_xmm2 boot_cpu_has(X86_FEATURE_XMM2) 129 #define cpu_has_aes boot_cpu_has(X86_FEATURE_AES) 130 #define cpu_has_avx boot_cpu_has(X86_FEATURE_AVX) 131 #define cpu_has_avx2 boot_cpu_has(X86_FEATURE_AVX2) 132 #define cpu_has_clflush boot_cpu_has(X86_FEATURE_CLFLUSH) 133 #define cpu_has_gbpages boot_cpu_has(X86_FEATURE_GBPAGES) 134 #define cpu_has_arch_perfmon boot_cpu_has(X86_FEATURE_ARCH_PERFMON) 135 #define cpu_has_pat boot_cpu_has(X86_FEATURE_PAT) 136 #define cpu_has_x2apic boot_cpu_has(X86_FEATURE_X2APIC) 137 #define cpu_has_xsave boot_cpu_has(X86_FEATURE_XSAVE) 138 #define cpu_has_xsaves boot_cpu_has(X86_FEATURE_XSAVES) 139 #define cpu_has_osxsave boot_cpu_has(X86_FEATURE_OSXSAVE) 140 #define cpu_has_hypervisor boot_cpu_has(X86_FEATURE_HYPERVISOR) 141 /* 142 * Do not add any more of those clumsy macros - use static_cpu_has() for 143 * fast paths and boot_cpu_has() otherwise! 144 */ 145 146 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS) 147 /* 148 * Static testing of CPU features. Used the same as boot_cpu_has(). 149 * These will statically patch the target code for additional 150 * performance. 151 */ 152 static __always_inline __pure bool _static_cpu_has(u16 bit) 153 { 154 asm_volatile_goto("1: jmp 6f\n" 155 "2:\n" 156 ".skip -(((5f-4f) - (2b-1b)) > 0) * " 157 "((5f-4f) - (2b-1b)),0x90\n" 158 "3:\n" 159 ".section .altinstructions,\"a\"\n" 160 " .long 1b - .\n" /* src offset */ 161 " .long 4f - .\n" /* repl offset */ 162 " .word %P1\n" /* always replace */ 163 " .byte 3b - 1b\n" /* src len */ 164 " .byte 5f - 4f\n" /* repl len */ 165 " .byte 3b - 2b\n" /* pad len */ 166 ".previous\n" 167 ".section .altinstr_replacement,\"ax\"\n" 168 "4: jmp %l[t_no]\n" 169 "5:\n" 170 ".previous\n" 171 ".section .altinstructions,\"a\"\n" 172 " .long 1b - .\n" /* src offset */ 173 " .long 0\n" /* no replacement */ 174 " .word %P0\n" /* feature bit */ 175 " .byte 3b - 1b\n" /* src len */ 176 " .byte 0\n" /* repl len */ 177 " .byte 0\n" /* pad len */ 178 ".previous\n" 179 ".section .altinstr_aux,\"ax\"\n" 180 "6:\n" 181 " testb %[bitnum],%[cap_byte]\n" 182 " jnz %l[t_yes]\n" 183 " jmp %l[t_no]\n" 184 ".previous\n" 185 : : "i" (bit), "i" (X86_FEATURE_ALWAYS), 186 [bitnum] "i" (1 << (bit & 7)), 187 [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3]) 188 : : t_yes, t_no); 189 t_yes: 190 return true; 191 t_no: 192 return false; 193 } 194 195 #define static_cpu_has(bit) \ 196 ( \ 197 __builtin_constant_p(boot_cpu_has(bit)) ? \ 198 boot_cpu_has(bit) : \ 199 _static_cpu_has(bit) \ 200 ) 201 #else 202 /* 203 * Fall back to dynamic for gcc versions which don't support asm goto. Should be 204 * a minority now anyway. 205 */ 206 #define static_cpu_has(bit) boot_cpu_has(bit) 207 #endif 208 209 #define cpu_has_bug(c, bit) cpu_has(c, (bit)) 210 #define set_cpu_bug(c, bit) set_cpu_cap(c, (bit)) 211 #define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit)) 212 213 #define static_cpu_has_bug(bit) static_cpu_has((bit)) 214 #define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit)) 215 216 #define MAX_CPU_FEATURES (NCAPINTS * 32) 217 #define cpu_have_feature boot_cpu_has 218 219 #define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X" 220 #define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \ 221 boot_cpu_data.x86_model 222 223 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */ 224 #endif /* _ASM_X86_CPUFEATURE_H */ 225