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/* $NetBSD: cpufeature.h,v 1.9 2021/12/19 11:52:47 riastradh Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_ASM_CPUFEATURE_H_
#define _LINUX_ASM_CPUFEATURE_H_
#include <sys/cpu.h>
#if defined(__i386__) || defined(__x86_64__)
#include <x86/specialreg.h>
#define cpu_has_clflush ((cpu_info_primary.ci_feat_val[0] & CPUID_CLFSH) != 0)
#define cpu_has_pat ((cpu_info_primary.ci_feat_val[0] & CPUID_PAT) != 0)
#define X86_FEATURE_CLFLUSH 0
#define X86_FEATURE_PAT 1
static inline bool
static_cpu_has(int feature)
{
switch (feature) {
case X86_FEATURE_CLFLUSH:
return cpu_has_clflush;
case X86_FEATURE_PAT:
return cpu_has_pat;
default:
return false;
}
}
#define boot_cpu_has static_cpu_has
static inline size_t
cache_line_size(void)
{
return cpu_info_primary.ci_cflush_lsize;
}
static inline void
clflush(const void *p)
{
asm volatile ("clflush %0" : : "m" (*(const char *)p));
}
#endif /* x86 */
#endif /* _LINUX_ASM_CPUFEATURE_H_ */
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