1 /*
2 *
3 * Copyright (C) 2008 Advanced Micro Devices, Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef _ARCH_MSR_H
30 #define _ARCH_MSR_H
31
_rdmsr(unsigned int msr)32 static inline unsigned long long _rdmsr(unsigned int msr)
33 {
34 unsigned long long val;
35 asm volatile("rdmsr" : "=A" (val) : "c" (msr));
36 return val;
37 }
38
_wrmsr(unsigned int msr,unsigned long long val)39 static inline void _wrmsr(unsigned int msr, unsigned long long val)
40 {
41 asm volatile("wrmsr" : : "c" (msr), "A"(val));
42 }
43
44 #define rdmsr(_m, _l, _h) \
45 do { \
46 unsigned long long _v = _rdmsr((_m)); \
47 (_l) = (unsigned int) _v; \
48 (_h) = (unsigned int) ((_v >> 32) & 0xFFFFFFFF); \
49 } while(0)
50
wrmsr(unsigned int msr,unsigned int lo,unsigned int hi)51 static inline void wrmsr(unsigned int msr, unsigned int lo, unsigned int hi)
52 {
53 unsigned long long val = (((unsigned long long) hi) << 32) | lo;
54 _wrmsr(msr, val);
55 }
56
57 #endif
58