1 /* Data structure for x86 CPU features. 2 This file is part of the GNU C Library. 3 Copyright (C) 2008-2022 Free Software Foundation, Inc. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_PLATFORM_X86_H 20 #define _SYS_PLATFORM_X86_H 21 22 #include <features.h> 23 #include <stdbool.h> 24 #include <bits/platform/x86.h> 25 26 __BEGIN_DECLS 27 28 /* Get a pointer to the CPU feature structure. */ 29 extern const struct cpuid_feature *__x86_get_cpuid_feature_leaf (unsigned int) 30 __attribute__ ((pure)); 31 32 static __inline__ _Bool x86_cpu_present(unsigned int __index)33x86_cpu_present (unsigned int __index) 34 { 35 const struct cpuid_feature *__ptr = __x86_get_cpuid_feature_leaf 36 (__index / (8 * sizeof (unsigned int) * 4)); 37 unsigned int __reg 38 = __index & (8 * sizeof (unsigned int) * 4 - 1); 39 unsigned int __bit = __reg & (8 * sizeof (unsigned int) - 1); 40 __reg /= 8 * sizeof (unsigned int); 41 42 return __ptr->cpuid_array[__reg] & (1 << __bit); 43 } 44 45 static __inline__ _Bool x86_cpu_active(unsigned int __index)46x86_cpu_active (unsigned int __index) 47 { 48 const struct cpuid_feature *__ptr = __x86_get_cpuid_feature_leaf 49 (__index / (8 * sizeof (unsigned int) * 4)); 50 unsigned int __reg 51 = __index & (8 * sizeof (unsigned int) * 4 - 1); 52 unsigned int __bit = __reg & (8 * sizeof (unsigned int) - 1); 53 __reg /= 8 * sizeof (unsigned int); 54 55 return __ptr->active_array[__reg] & (1 << __bit); 56 } 57 58 /* CPU_FEATURE_PRESENT evaluates to true if CPU supports the feature. */ 59 #define CPU_FEATURE_PRESENT(name) x86_cpu_present (x86_cpu_##name) 60 /* CPU_FEATURE_ACTIVE evaluates to true if the feature is active. */ 61 #define CPU_FEATURE_ACTIVE(name) x86_cpu_active (x86_cpu_##name) 62 63 __END_DECLS 64 65 #endif /* _SYS_PLATFORM_X86_H */ 66