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      1 /*	$NetBSD: cpufeature.h,v 1.9 2021/12/19 11:52:47 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 <sys/cpu.h>
     36 
     37 #if defined(__i386__) || defined(__x86_64__)
     38 
     39 #include <x86/specialreg.h>
     40 
     41 #define	cpu_has_clflush	((cpu_info_primary.ci_feat_val[0] & CPUID_CLFSH) != 0)
     42 #define	cpu_has_pat	((cpu_info_primary.ci_feat_val[0] & CPUID_PAT) != 0)
     43 
     44 #define	X86_FEATURE_CLFLUSH	0
     45 #define	X86_FEATURE_PAT		1
     46 
     47 static inline bool
     48 static_cpu_has(int feature)
     49 {
     50 	switch (feature) {
     51 	case X86_FEATURE_CLFLUSH:
     52 		return cpu_has_clflush;
     53 	case X86_FEATURE_PAT:
     54 		return cpu_has_pat;
     55 	default:
     56 		return false;
     57 	}
     58 }
     59 
     60 #define	boot_cpu_has	static_cpu_has
     61 
     62 static inline size_t
     63 cache_line_size(void)
     64 {
     65 	return cpu_info_primary.ci_cflush_lsize;
     66 }
     67 
     68 static inline void
     69 clflush(const void *p)
     70 {
     71 	asm volatile ("clflush %0" : : "m" (*(const char *)p));
     72 }
     73 
     74 #endif	/* x86 */
     75 
     76 #endif	/* _LINUX_ASM_CPUFEATURE_H_ */
     77