Current File : //usr/include/x86_64-linux-gnu/sys/platform/x86.h
/* Data structure for x86 CPU features.
This file is part of the GNU C Library.
Copyright (C) 2008-2024 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>
#include <bits/platform/features.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)
{
if (__index == x86_cpu_IBT || __index == x86_cpu_SHSTK)
return x86_cpu_cet_active (__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 */
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