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      1 /* $NetBSD: cpu_msr.h,v 1.7 2009/10/05 23:59:31 rmind Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 Juan Romero Pardines.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _X86_CPU_MSR_H
     29 #define _X86_CPU_MSR_H
     30 
     31 #include <sys/param.h>
     32 #include <sys/types.h>
     33 
     34 #ifdef _KERNEL
     35 
     36 struct msr_rw_info {
     37 	int		msr_read;
     38 	int		msr_type;
     39 	uint64_t	msr_value;
     40 	uint64_t	msr_mask;
     41 };
     42 
     43 static inline void
     44 x86_msr_xcall(void *arg1, void *arg2)
     45 {
     46 	struct msr_rw_info *msrdat = arg1;
     47 	uint64_t msr = 0;
     48 
     49 	KASSERT(msrdat->msr_type != 0);
     50 
     51 	/* Read the MSR requested and apply the mask if defined. */
     52 	if (msrdat->msr_read) {
     53 		msr = rdmsr(msrdat->msr_type);
     54 		if (msrdat->msr_mask) {
     55 			msr &= ~msrdat->msr_mask;
     56 		}
     57 	}
     58 	/* Assign (or extract, on read) the value and perform the write. */
     59 	msr |= msrdat->msr_value;
     60 	wrmsr(msrdat->msr_type, msr);
     61 }
     62 
     63 #endif /* ! _KERNEL */
     64 #endif /* ! _X86_CPU_MSR_H */
     65