| 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 | |