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