1 /* 2 * Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc. 3 * 4 * This file is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the 6 * Free Software Foundation; either version 3, or (at your option) any 7 * later version. 8 * 9 * This file is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * Under Section 7 of GPL version 3, you are granted additional 15 * permissions described in the GCC Runtime Library Exception, version 16 * 3.1, as published by the Free Software Foundation. 17 * 18 * You should have received a copy of the GNU General Public License and 19 * a copy of the GCC Runtime Library Exception along with this program; 20 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 21 * <http://www.gnu.org/licenses/>. 22 */ 23 24 /* %ecx */ 25 #define bit_SSE3 (1 << 0) 26 #define bit_PCLMUL (1 << 1) 27 #define bit_LZCNT (1 << 5) 28 #define bit_SSSE3 (1 << 9) 29 #define bit_FMA (1 << 12) 30 #define bit_CMPXCHG16B (1 << 13) 31 #define bit_SSE4_1 (1 << 19) 32 #define bit_SSE4_2 (1 << 20) 33 #define bit_MOVBE (1 << 22) 34 #define bit_POPCNT (1 << 23) 35 #define bit_AES (1 << 25) 36 #define bit_XSAVE (1 << 26) 37 #define bit_OSXSAVE (1 << 27) 38 #define bit_AVX (1 << 28) 39 #define bit_F16C (1 << 29) 40 #define bit_RDRND (1 << 30) 41 42 /* %edx */ 43 #define bit_CMPXCHG8B (1 << 8) 44 #define bit_CMOV (1 << 15) 45 #define bit_MMX (1 << 23) 46 #define bit_FXSAVE (1 << 24) 47 #define bit_SSE (1 << 25) 48 #define bit_SSE2 (1 << 26) 49 50 /* Extended Features */ 51 /* %ecx */ 52 #define bit_LAHF_LM (1 << 0) 53 #define bit_ABM (1 << 5) 54 #define bit_SSE4a (1 << 6) 55 #define bit_XOP (1 << 11) 56 #define bit_LWP (1 << 15) 57 #define bit_FMA4 (1 << 16) 58 #define bit_TBM (1 << 21) 59 60 /* %edx */ 61 #define bit_MMXEXT (1 << 22) 62 #define bit_LM (1 << 29) 63 #define bit_3DNOWP (1 << 30) 64 #define bit_3DNOW (1 << 31) 65 66 /* Extended Features (%eax == 7) */ 67 #define bit_FSGSBASE (1 << 0) 68 #define bit_BMI (1 << 3) 69 #define bit_AVX2 (1 << 5) 70 #define bit_BMI2 (1 << 8) 71 72 #if defined(__i386__) && defined(__PIC__) 73 /* %ebx may be the PIC register. */ 74 #if __GNUC__ >= 3 75 #define __cpuid(level, a, b, c, d) \ 76 __asm__ ("xchg{l}\t{%%}ebx, %k1\n\t" \ 77 "cpuid\n\t" \ 78 "xchg{l}\t{%%}ebx, %k1\n\t" \ 79 : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ 80 : "0" (level)) 81 82 #define __cpuid_count(level, count, a, b, c, d) \ 83 __asm__ ("xchg{l}\t{%%}ebx, %k1\n\t" \ 84 "cpuid\n\t" \ 85 "xchg{l}\t{%%}ebx, %k1\n\t" \ 86 : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ 87 : "0" (level), "2" (count)) 88 #else 89 /* Host GCCs older than 3.0 weren't supporting Intel asm syntax 90 nor alternatives in i386 code. */ 91 #define __cpuid(level, a, b, c, d) \ 92 __asm__ ("xchgl\t%%ebx, %k1\n\t" \ 93 "cpuid\n\t" \ 94 "xchgl\t%%ebx, %k1\n\t" \ 95 : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ 96 : "0" (level)) 97 98 #define __cpuid_count(level, count, a, b, c, d) \ 99 __asm__ ("xchgl\t%%ebx, %k1\n\t" \ 100 "cpuid\n\t" \ 101 "xchgl\t%%ebx, %k1\n\t" \ 102 : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ 103 : "0" (level), "2" (count)) 104 #endif 105 #elif defined(__x86_64__) && (defined(__code_model_medium__) || defined(__code_model_large__)) && defined(__PIC__) 106 /* %rbx may be the PIC register. */ 107 #define __cpuid(level, a, b, c, d) \ 108 __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t" \ 109 "cpuid\n\t" \ 110 "xchg{q}\t{%%}rbx, %q1\n\t" \ 111 : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ 112 : "0" (level)) 113 114 #define __cpuid_count(level, count, a, b, c, d) \ 115 __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t" \ 116 "cpuid\n\t" \ 117 "xchg{q}\t{%%}rbx, %q1\n\t" \ 118 : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ 119 : "0" (level), "2" (count)) 120 #else 121 #define __cpuid(level, a, b, c, d) \ 122 __asm__ ("cpuid\n\t" \ 123 : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ 124 : "0" (level)) 125 126 #define __cpuid_count(level, count, a, b, c, d) \ 127 __asm__ ("cpuid\n\t" \ 128 : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ 129 : "0" (level), "2" (count)) 130 #endif 131 132 /* Return highest supported input value for cpuid instruction. ext can 133 be either 0x0 or 0x8000000 to return highest supported value for 134 basic or extended cpuid information. Function returns 0 if cpuid 135 is not supported or whatever cpuid returns in eax register. If sig 136 pointer is non-null, then first four bytes of the signature 137 (as found in ebx register) are returned in location pointed by sig. */ 138 139 static __inline unsigned int 140 __get_cpuid_max (unsigned int __ext, unsigned int *__sig) 141 { 142 unsigned int __eax, __ebx, __ecx, __edx; 143 144 #ifndef __x86_64__ 145 /* See if we can use cpuid. On AMD64 we always can. */ 146 #if __GNUC__ >= 3 147 __asm__ ("pushf{l|d}\n\t" 148 "pushf{l|d}\n\t" 149 "pop{l}\t%0\n\t" 150 "mov{l}\t{%0, %1|%1, %0}\n\t" 151 "xor{l}\t{%2, %0|%0, %2}\n\t" 152 "push{l}\t%0\n\t" 153 "popf{l|d}\n\t" 154 "pushf{l|d}\n\t" 155 "pop{l}\t%0\n\t" 156 "popf{l|d}\n\t" 157 : "=&r" (__eax), "=&r" (__ebx) 158 : "i" (0x00200000)); 159 #else 160 /* Host GCCs older than 3.0 weren't supporting Intel asm syntax 161 nor alternatives in i386 code. */ 162 __asm__ ("pushfl\n\t" 163 "pushfl\n\t" 164 "popl\t%0\n\t" 165 "movl\t%0, %1\n\t" 166 "xorl\t%2, %0\n\t" 167 "pushl\t%0\n\t" 168 "popfl\n\t" 169 "pushfl\n\t" 170 "popl\t%0\n\t" 171 "popfl\n\t" 172 : "=&r" (__eax), "=&r" (__ebx) 173 : "i" (0x00200000)); 174 #endif 175 176 if (!((__eax ^ __ebx) & 0x00200000)) 177 return 0; 178 #endif 179 180 /* Host supports cpuid. Return highest supported cpuid input value. */ 181 __cpuid (__ext, __eax, __ebx, __ecx, __edx); 182 183 if (__sig) 184 *__sig = __ebx; 185 186 return __eax; 187 } 188 189 /* Return cpuid data for requested cpuid level, as found in returned 190 eax, ebx, ecx and edx registers. The function checks if cpuid is 191 supported and returns 1 for valid cpuid information or 0 for 192 unsupported cpuid level. All pointers are required to be non-null. */ 193 194 static __inline int 195 __get_cpuid (unsigned int __level, 196 unsigned int *__eax, unsigned int *__ebx, 197 unsigned int *__ecx, unsigned int *__edx) 198 { 199 unsigned int __ext = __level & 0x80000000; 200 201 if (__get_cpuid_max (__ext, 0) < __level) 202 return 0; 203 204 __cpuid (__level, *__eax, *__ebx, *__ecx, *__edx); 205 return 1; 206 } 207