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x86.h
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/* Data structure for x86 CPU features. This file is part of the GNU C Library. Copyright (C) 2008-2021 Free Software Foundation, Inc. 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 <https://www.gnu.org/licenses/>. */ #ifndef _SYS_PLATFORM_X86_H #define _SYS_PLATFORM_X86_H #include <features.h> #include <stdbool.h> #include <bits/platform/x86.h> __BEGIN_DECLS /* Get a pointer to the CPU feature structure. */ extern const struct cpuid_feature *__x86_get_cpuid_feature_leaf (unsigned int) __attribute__ ((pure)); static __inline__ _Bool x86_cpu_present (unsigned int __index) { const struct cpuid_feature *__ptr = __x86_get_cpuid_feature_leaf (__index / (8 * sizeof (unsigned int) * 4)); unsigned int __reg = __index & (8 * sizeof (unsigned int) * 4 - 1); unsigned int __bit = __reg & (8 * sizeof (unsigned int) - 1); __reg /= 8 * sizeof (unsigned int); return __ptr->cpuid_array[__reg] & (1 << __bit); } static __inline__ _Bool x86_cpu_active (unsigned int __index) { const struct cpuid_feature *__ptr = __x86_get_cpuid_feature_leaf (__index / (8 * sizeof (unsigned int) * 4)); unsigned int __reg = __index & (8 * sizeof (unsigned int) * 4 - 1); unsigned int __bit = __reg & (8 * sizeof (unsigned int) - 1); __reg /= 8 * sizeof (unsigned int); return __ptr->active_array[__reg] & (1 << __bit); } /* CPU_FEATURE_PRESENT evaluates to true if CPU supports the feature. */ #define CPU_FEATURE_PRESENT(name) x86_cpu_present (x86_cpu_##name) /* CPU_FEATURE_ACTIVE evaluates to true if the feature is active. */ #define CPU_FEATURE_ACTIVE(name) x86_cpu_active (x86_cpu_##name) __END_DECLS #endif /* _SYS_PLATFORM_X86_H */