util/msrtool/darwin.c

   1 /*
   2  * This file is part of msrtool.
   3  *
   4  * Copyright (c) 2009 coresystems GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <unistd.h>
  20 #include <string.h>
  21 #include <errno.h>
  22
  23 #include "msrtool.h"
  24
  25 /* This Darwin support requires DirectHW, which is available at
  26  * http://www.coreboot.org/DirectHW
  27  */
  28
  29 int darwin_probe(const struct sysdef *system)
  30 {
  31 #ifdef __DARWIN__
  32         return iopl(3) == 0;
  33 #else
  34         return 0;
  35 #endif
  36 }
  37
  38 int darwin_open(uint8_t cpu, enum SysModes mode)
  39 {
  40 #ifdef __DARWIN__
  41         if (cpu > 0) {
  42                 fprintf(stderr, "%s: only core 0 is supported on Mac OS X right now.\n", __func__);
  43                 return 0;
  44         }
  45         return 1;
  46 #else
  47         return 0;
  48 #endif
  49 }
  50
  51 int darwin_close(uint8_t cpu)
  52 {
  53         return 1;
  54 }
  55
  56 int darwin_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val)
  57 {
  58 #ifdef __DARWIN__
  59         msr_t msr;
  60
  61         msr = rdmsr(addr);
  62
  63         val->hi = msr.lo;
  64         val->lo = msr.hi;
  65         return 1;
  66 #else
  67         return 0;
  68 #endif
  69 }