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
x86_msr_xcall(void * arg1,void * arg2)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