1/* $NetBSD: cpu_msr.h,v 1.6 2007/10/17 19:58:14 garbled 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
36struct msr_rw_info {
37	int		msr_read;
38	int		msr_type;
39	uint64_t	msr_value;
40	uint64_t	msr_mask;
41};
42
43static inline void
44x86_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