sys/arch/x86/include/cpu_msr.h

   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 */