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cpufeature.h revision 1.7 
      1 /*	$NetBSD: cpufeature.h,v 1.7 2021/12/19 01:25:05 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef	_LINUX_ASM_CPUFEATURE_H_
     33 #define	_LINUX_ASM_CPUFEATURE_H_
     34 
     35 #include <machine/cpu.h>
     36 
     37 #if defined(__i386__) || defined(__x86_64__)
     38 
     39 #define	cpu_has_clflush	((cpu_info_primary.ci_feat_val[0] & CPUID_CLFSH) != 0)
     40 #define	cpu_has_pat	((cpu_info_primary.ci_feat_val[0] & CPUID_PAT) != 0)
     41 
     42 #define	X86_FEATURE_CLFLUSH	0
     43 #define	X86_FEATURE_PAT		1
     44 
     45 static inline bool
     46 static_cpu_has(int feature)
     47 {
     48 	switch (feature) {
     49 	case X86_FEATURE_CLFLUSH:
     50 		return cpu_has_clflush;
     51 	case X86_FEATURE_PAT:
     52 		return cpu_has_pat;
     53 	default:
     54 		return false;
     55 	}
     56 }
     57 
     58 #define	boot_cpu_has	static_cpu_has
     59 
     60 static inline size_t
     61 cache_line_size(void)
     62 {
     63 	return cpu_info_primary.ci_cflush_lsize;
     64 }
     65 
     66 static inline void
     67 clflush(const void *p)
     68 {
     69 	asm volatile ("clflush %0" : : "m" (*(const char *)p));
     70 }
     71 
     72 #endif	/* x86 */
     73 
     74 #endif	/* _LINUX_ASM_CPUFEATURE_H_ */
     75