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cpuid.h
/* * Copyright (C) 2007-2021 Free Software Foundation, Inc. * * This file is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 3, or (at your option) any * later version. * * This file is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * Under Section 7 of GPL version 3, you are granted additional * permissions described in the GCC Runtime Library Exception, version * 3.1, as published by the Free Software Foundation. * * You should have received a copy of the GNU General Public License and * a copy of the GCC Runtime Library Exception along with this program; * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see * <http://www.gnu.org/licenses/>. */ #ifndef _CPUID_H_INCLUDED #define _CPUID_H_INCLUDED /* %eax */ #define bit_AVXVNNI (1 << 4) #define bit_AVX512BF16 (1 << 5) #define bit_HRESET (1 << 22) /* %ecx */ #define bit_SSE3 (1 << 0) #define bit_PCLMUL (1 << 1) #define bit_LZCNT (1 << 5) #define bit_SSSE3 (1 << 9) #define bit_FMA (1 << 12) #define bit_CMPXCHG16B (1 << 13) #define bit_SSE4_1 (1 << 19) #define bit_SSE4_2 (1 << 20) #define bit_MOVBE (1 << 22) #define bit_POPCNT (1 << 23) #define bit_AES (1 << 25) #define bit_XSAVE (1 << 26) #define bit_OSXSAVE (1 << 27) #define bit_AVX (1 << 28) #define bit_F16C (1 << 29) #define bit_RDRND (1 << 30) /* %edx */ #define bit_CMPXCHG8B (1 << 8) #define bit_CMOV (1 << 15) #define bit_MMX (1 << 23) #define bit_FXSAVE (1 << 24) #define bit_SSE (1 << 25) #define bit_SSE2 (1 << 26) /* Extended Features (%eax == 0x80000001) */ /* %ecx */ #define bit_LAHF_LM (1 << 0) #define bit_ABM (1 << 5) #define bit_SSE4a (1 << 6) #define bit_PRFCHW (1 << 8) #define bit_XOP (1 << 11) #define bit_LWP (1 << 15) #define bit_FMA4 (1 << 16) #define bit_TBM (1 << 21) #define bit_MWAITX (1 << 29) /* %edx */ #define bit_MMXEXT (1 << 22) #define bit_LM (1 << 29) #define bit_3DNOWP (1 << 30) #define bit_3DNOW (1u << 31) /* %ebx */ #define bit_CLZERO (1 << 0) #define bit_WBNOINVD (1 << 9) /* Extended Features (%eax == 7) */ /* %ebx */ #define bit_FSGSBASE (1 << 0) #define bit_SGX (1 << 2) #define bit_BMI (1 << 3) #define bit_HLE (1 << 4) #define bit_AVX2 (1 << 5) #define bit_BMI2 (1 << 8) #define bit_RTM (1 << 11) #define bit_MPX (1 << 14) #define bit_AVX512F (1 << 16) #define bit_AVX512DQ (1 << 17) #define bit_RDSEED (1 << 18) #define bit_ADX (1 << 19) #define bit_AVX512IFMA (1 << 21) #define bit_CLFLUSHOPT (1 << 23) #define bit_CLWB (1 << 24) #define bit_AVX512PF (1 << 26) #define bit_AVX512ER (1 << 27) #define bit_AVX512CD (1 << 28) #define bit_SHA (1 << 29) #define bit_AVX512BW (1 << 30) #define bit_AVX512VL (1u << 31) /* %ecx */ #define bit_PREFETCHWT1 (1 << 0) #define bit_AVX512VBMI (1 << 1) #define bit_PKU (1 << 3) #define bit_OSPKE (1 << 4) #define bit_WAITPKG (1 << 5) #define bit_AVX512VBMI2 (1 << 6) #define bit_SHSTK (1 << 7) #define bit_GFNI (1 << 8) #define bit_VAES (1 << 9) #define bit_AVX512VNNI (1 << 11) #define bit_VPCLMULQDQ (1 << 10) #define bit_AVX512BITALG (1 << 12) #define bit_AVX512VPOPCNTDQ (1 << 14) #define bit_RDPID (1 << 22) #define bit_MOVDIRI (1 << 27) #define bit_MOVDIR64B (1 << 28) #define bit_ENQCMD (1 << 29) #define bit_CLDEMOTE (1 << 25) #define bit_KL (1 << 23) /* %edx */ #define bit_AVX5124VNNIW (1 << 2) #define bit_AVX5124FMAPS (1 << 3) #define bit_AVX512VP2INTERSECT (1 << 8) #define bit_IBT (1 << 20) #define bit_UINTR (1 << 5) #define bit_PCONFIG (1 << 18) #define bit_SERIALIZE (1 << 14) #define bit_TSXLDTRK (1 << 16) #define bit_AMX_BF16 (1 << 22) #define bit_AMX_TILE (1 << 24) #define bit_AMX_INT8 (1 << 25) /* XFEATURE_ENABLED_MASK register bits (%eax == 0xd, %ecx == 0) */ #define bit_BNDREGS (1 << 3) #define bit_BNDCSR (1 << 4) /* Extended State Enumeration Sub-leaf (%eax == 0xd, %ecx == 1) */ #define bit_XSAVEOPT (1 << 0) #define bit_XSAVEC (1 << 1) #define bit_XSAVES (1 << 3) /* PT sub leaf (%eax == 0x14, %ecx == 0) */ /* %ebx */ #define bit_PTWRITE (1 << 4) /* Keylocker leaf (%eax == 0x19) */ /* %ebx */ #define bit_AESKLE ( 1<<0 ) #define bit_WIDEKL ( 1<<2 ) /* Signatures for different CPU implementations as returned in uses of cpuid with level 0. */ #define signature_AMD_ebx 0x68747541 #define signature_AMD_ecx 0x444d4163 #define signature_AMD_edx 0x69746e65 #define signature_CENTAUR_ebx 0x746e6543 #define signature_CENTAUR_ecx 0x736c7561 #define signature_CENTAUR_edx 0x48727561 #define signature_CYRIX_ebx 0x69727943 #define signature_CYRIX_ecx 0x64616574 #define signature_CYRIX_edx 0x736e4978 #define signature_INTEL_ebx 0x756e6547 #define signature_INTEL_ecx 0x6c65746e #define signature_INTEL_edx 0x49656e69 #define signature_TM1_ebx 0x6e617254 #define signature_TM1_ecx 0x55504361 #define signature_TM1_edx 0x74656d73 #define signature_TM2_ebx 0x756e6547 #define signature_TM2_ecx 0x3638784d #define signature_TM2_edx 0x54656e69 #define signature_NSC_ebx 0x646f6547 #define signature_NSC_ecx 0x43534e20 #define signature_NSC_edx 0x79622065 #define signature_NEXGEN_ebx 0x4778654e #define signature_NEXGEN_ecx 0x6e657669 #define signature_NEXGEN_edx 0x72446e65 #define signature_RISE_ebx 0x65736952 #define signature_RISE_ecx 0x65736952 #define signature_RISE_edx 0x65736952 #define signature_SIS_ebx 0x20536953 #define signature_SIS_ecx 0x20536953 #define signature_SIS_edx 0x20536953 #define signature_UMC_ebx 0x20434d55 #define signature_UMC_ecx 0x20434d55 #define signature_UMC_edx 0x20434d55 #define signature_VIA_ebx 0x20414956 #define signature_VIA_ecx 0x20414956 #define signature_VIA_edx 0x20414956 #define signature_VORTEX_ebx 0x74726f56 #define signature_VORTEX_ecx 0x436f5320 #define signature_VORTEX_edx 0x36387865 #ifndef __x86_64__ /* At least one cpu (Winchip 2) does not set %ebx and %ecx for cpuid leaf 1. Forcibly zero the two registers before calling cpuid as a precaution. */ #define __cpuid(level, a, b, c, d) \ do { \ if (__builtin_constant_p (level) && (level) != 1) \ __asm__ __volatile__ ("cpuid\n\t" \ : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ : "0" (level)); \ else \ __asm__ __volatile__ ("cpuid\n\t" \ : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ : "0" (level), "1" (0), "2" (0)); \ } while (0) #else #define __cpuid(level, a, b, c, d) \ __asm__ __volatile__ ("cpuid\n\t" \ : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ : "0" (level)) #endif #define __cpuid_count(level, count, a, b, c, d) \ __asm__ __volatile__ ("cpuid\n\t" \ : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ : "0" (level), "2" (count)) /* Return highest supported input value for cpuid instruction. ext can be either 0x0 or 0x80000000 to return highest supported value for basic or extended cpuid information. Function returns 0 if cpuid is not supported or whatever cpuid returns in eax register. If sig pointer is non-null, then first four bytes of the signature (as found in ebx register) are returned in location pointed by sig. */ static __inline unsigned int __get_cpuid_max (unsigned int __ext, unsigned int *__sig) { unsigned int __eax, __ebx, __ecx, __edx; #ifndef __x86_64__ /* See if we can use cpuid. On AMD64 we always can. */ #if __GNUC__ >= 3 __asm__ ("pushf{l|d}\n\t" "pushf{l|d}\n\t" "pop{l}\t%0\n\t" "mov{l}\t{%0, %1|%1, %0}\n\t" "xor{l}\t{%2, %0|%0, %2}\n\t" "push{l}\t%0\n\t" "popf{l|d}\n\t" "pushf{l|d}\n\t" "pop{l}\t%0\n\t" "popf{l|d}\n\t" : "=&r" (__eax), "=&r" (__ebx) : "i" (0x00200000)); #else /* Host GCCs older than 3.0 weren't supporting Intel asm syntax nor alternatives in i386 code. */ __asm__ ("pushfl\n\t" "pushfl\n\t" "popl\t%0\n\t" "movl\t%0, %1\n\t" "xorl\t%2, %0\n\t" "pushl\t%0\n\t" "popfl\n\t" "pushfl\n\t" "popl\t%0\n\t" "popfl\n\t" : "=&r" (__eax), "=&r" (__ebx) : "i" (0x00200000)); #endif if (!((__eax ^ __ebx) & 0x00200000)) return 0; #endif /* Host supports cpuid. Return highest supported cpuid input value. */ __cpuid (__ext, __eax, __ebx, __ecx, __edx); if (__sig) *__sig = __ebx; return __eax; } /* Return cpuid data for requested cpuid leaf, as found in returned eax, ebx, ecx and edx registers. The function checks if cpuid is supported and returns 1 for valid cpuid information or 0 for unsupported cpuid leaf. All pointers are required to be non-null. */ static __inline int __get_cpuid (unsigned int __leaf, unsigned int *__eax, unsigned int *__ebx, unsigned int *__ecx, unsigned int *__edx) { unsigned int __ext = __leaf & 0x80000000; unsigned int __maxlevel = __get_cpuid_max (__ext, 0); if (__maxlevel == 0 || __maxlevel < __leaf) return 0; __cpuid (__leaf, *__eax, *__ebx, *__ecx, *__edx); return 1; } /* Same as above, but sub-leaf can be specified. */ static __inline int __get_cpuid_count (unsigned int __leaf, unsigned int __subleaf, unsigned int *__eax, unsigned int *__ebx, unsigned int *__ecx, unsigned int *__edx) { unsigned int __ext = __leaf & 0x80000000; unsigned int __maxlevel = __get_cpuid_max (__ext, 0); if (__maxlevel == 0 || __maxlevel < __leaf) return 0; __cpuid_count (__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx); return 1; } static __inline void __cpuidex (int __cpuid_info[4], int __leaf, int __subleaf) { __cpuid_count (__leaf, __subleaf, __cpuid_info[0], __cpuid_info[1], __cpuid_info[2], __cpuid_info[3]); } #endif /* _CPUID_H_INCLUDED */
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