/* Data structure for x86 CPU features. Copyright (C) 2020-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ #ifndef _PRIVATE_CPU_FEATURES_H #define _PRIVATE_CPU_FEATURES_H 1 #ifdef _CPU_FEATURES_H # error this should be impossible #endif /* Get most of the contents from the public header, but we define a different `struct cpu_features' type for private use. */ #define cpu_features cpu_features_public #define __x86_get_cpu_features __x86_get_cpu_features_public #include #undef cpu_features #undef __x86_get_cpu_features #define __get_cpu_features() __x86_get_cpu_features (0) enum { /* The integer bit array index for the first set of preferred feature bits. */ PREFERRED_FEATURE_INDEX_1 = 0, /* The current maximum size of the feature integer bit array. */ PREFERRED_FEATURE_INDEX_MAX }; /* Only used directly in cpu-features.c. */ #define CPU_FEATURE_SET(ptr, name) \ ptr->features[index_cpu_##name].usable.reg_##name |= bit_cpu_##name; #define CPU_FEATURE_UNSET(ptr, name) \ ptr->features[index_cpu_##name].usable.reg_##name &= ~bit_cpu_##name; #define CPU_FEATURE_SET_USABLE(ptr, name) \ ptr->features[index_cpu_##name].usable.reg_##name \ |= ptr->features[index_cpu_##name].cpuid.reg_##name & bit_cpu_##name; #define CPU_FEATURE_PREFERRED_P(ptr, name) \ ((ptr->preferred[index_arch_##name] & bit_arch_##name) != 0) /* HAS_CPU_FEATURE evaluates to true if CPU supports the feature. */ #undef HAS_CPU_FEATURE #define HAS_CPU_FEATURE(name) \ CPU_FEATURE_CPU_P (__x86_get_cpu_features (0), name) /* CPU_FEATURE_USABLE evaluates to true if the feature is usable. */ #undef CPU_FEATURE_USABLE #define CPU_FEATURE_USABLE(name) \ CPU_FEATURE_USABLE_P (__x86_get_cpu_features (0), name) /* CPU_FEATURE_PREFER evaluates to true if we prefer the feature at runtime. */ #define CPU_FEATURE_PREFERRED(name) \ CPU_FEATURE_PREFERRED_P(__get_cpu_features (), name) #define CPU_FEATURES_CPU_P(ptr, name) \ CPU_FEATURE_CPU_P (ptr, name) #define CPU_FEATURES_ARCH_P(ptr, name) \ CPU_FEATURE_PREFERRED_P (ptr, name) #define HAS_ARCH_FEATURE(name) \ CPU_FEATURE_PREFERRED (name) /* PREFERRED_FEATURE_INDEX_1. */ #define bit_arch_I586 (1u << 0) #define bit_arch_I686 (1u << 1) #define bit_arch_Fast_Rep_String (1u << 2) #define bit_arch_Fast_Copy_Backward (1u << 3) #define bit_arch_Fast_Unaligned_Load (1u << 4) #define bit_arch_Fast_Unaligned_Copy (1u << 5) #define bit_arch_Slow_BSF (1u << 6) #define bit_arch_Slow_SSE4_2 (1u << 7) #define bit_arch_AVX_Fast_Unaligned_Load (1u << 8) #define bit_arch_Prefer_MAP_32BIT_EXEC (1u << 9) #define bit_arch_Prefer_PMINUB_for_stringop (1u << 10) #define bit_arch_Prefer_No_VZEROUPPER (1u << 11) #define bit_arch_Prefer_ERMS (1u << 12) #define bit_arch_Prefer_FSRM (1u << 13) #define bit_arch_Prefer_No_AVX512 (1u << 14) #define bit_arch_MathVec_Prefer_No_AVX512 (1u << 15) #define index_arch_Fast_Rep_String PREFERRED_FEATURE_INDEX_1 #define index_arch_Fast_Copy_Backward PREFERRED_FEATURE_INDEX_1 #define index_arch_Slow_BSF PREFERRED_FEATURE_INDEX_1 #define index_arch_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1 #define index_arch_Prefer_PMINUB_for_stringop PREFERRED_FEATURE_INDEX_1 #define index_arch_Fast_Unaligned_Copy PREFERRED_FEATURE_INDEX_1 #define index_arch_I586 PREFERRED_FEATURE_INDEX_1 #define index_arch_I686 PREFERRED_FEATURE_INDEX_1 #define index_arch_Slow_SSE4_2 PREFERRED_FEATURE_INDEX_1 #define index_arch_AVX_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1 #define index_arch_Prefer_MAP_32BIT_EXEC PREFERRED_FEATURE_INDEX_1 #define index_arch_Prefer_No_VZEROUPPER PREFERRED_FEATURE_INDEX_1 #define index_arch_Prefer_ERMS PREFERRED_FEATURE_INDEX_1 #define index_arch_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1 #define index_arch_MathVec_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1 #define index_arch_Prefer_FSRM PREFERRED_FEATURE_INDEX_1 /* XCR0 Feature flags. */ #define bit_XMM_state (1u << 1) #define bit_YMM_state (1u << 2) #define bit_Opmask_state (1u << 5) #define bit_ZMM0_15_state (1u << 6) #define bit_ZMM16_31_state (1u << 7) #define bit_XTILECFG_state (1u << 17) #define bit_XTILEDATA_state (1u << 18) struct cpu_features { struct cpu_features_basic basic; struct cpuid_features features[COMMON_CPUID_INDEX_MAX]; unsigned int preferred[PREFERRED_FEATURE_INDEX_MAX]; /* The state size for XSAVEC or XSAVE. The type must be unsigned long int so that we use sub xsave_state_size_offset(%rip) %RSP_LP in _dl_runtime_resolve. */ unsigned long int xsave_state_size; /* The full state size for XSAVE when XSAVEC is disabled by GLIBC_TUNABLES=glibc.cpu.hwcaps=-XSAVEC */ unsigned int xsave_state_full_size; /* Data cache size for use in memory and string routines, typically L1 size. */ unsigned long int data_cache_size; /* Shared cache size for use in memory and string routines, typically L2 or L3 size. */ unsigned long int shared_cache_size; /* Threshold to use non temporal store. */ unsigned long int non_temporal_threshold; /* Threshold to use "rep movsb". */ unsigned long int rep_movsb_threshold; /* Threshold to use "rep stosb". */ unsigned long int rep_stosb_threshold; }; #if defined (_LIBC) && !IS_IN (nonlib) /* Unused for x86. */ # define INIT_ARCH() # define __x86_get_cpu_features(max) (&GLRO(dl_x86_cpu_features)) extern void _dl_x86_init_cpu_features (void) attribute_hidden; #endif #ifdef __x86_64__ # define HAS_CPUID 1 #elif (defined __i586__ || defined __pentium__ \ || defined __geode__ || defined __k6__) # define HAS_CPUID 1 # define HAS_I586 1 # define HAS_I686 HAS_ARCH_FEATURE (I686) #elif defined __i486__ # define HAS_CPUID 0 # define HAS_I586 HAS_ARCH_FEATURE (I586) # define HAS_I686 HAS_ARCH_FEATURE (I686) #else # define HAS_CPUID 1 # define HAS_I586 1 # define HAS_I686 1 # endif #endif /* include/cpu-features.h */