vidix/mtrr.c

   1 /*
   2  * VIDIX Memory access optimization routines.
   3  * Copyright (C) 2002 Nick Kurshev
   4  *
   5  * This file is part of MPlayer.
   6  *
   7  * MPlayer is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * MPlayer is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "config.h"
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include "dha.h"
  28 #include "AsmMacros.h"
  29
  30 #if defined (__i386__) && defined (__NetBSD__)
  31 #include <sys/param.h>
  32 #if __NetBSD_Version__ > 105240000
  33 #include <stdint.h>
  34 #include <stdlib.h>
  35 #include <machine/mtrr.h>
  36 #include <machine/sysarch.h>
  37 #endif
  38 #endif
  39
  40 int     mtrr_set_type(unsigned base,unsigned size,int type)
  41 {
  42 #ifdef __linux__
  43     FILE * mtrr_fd;
  44     const char *stype;
  45     switch(type)
  46     {
  47         case MTRR_TYPE_UNCACHABLE: stype = "uncachable"; break;
  48         case MTRR_TYPE_WRCOMB:     stype = "write-combining"; break;
  49         case MTRR_TYPE_WRTHROUGH:  stype = "write-through"; break;
  50         case MTRR_TYPE_WRPROT:     stype = "write-protect"; break;
  51         case MTRR_TYPE_WRBACK:     stype = "write-back"; break;
  52         default:                   return EINVAL;
  53     }
  54     mtrr_fd = fopen("/proc/mtrr","wt");
  55     if(mtrr_fd)
  56     {
  57         int wr_len = fprintf(mtrr_fd, "base=0x%08X size=0x%08X type=%s\n", base, size, stype);
  58         fclose(mtrr_fd);
  59         return wr_len > 0 ? 0 : EPERM;
  60     }
  61     return ENOSYS;
  62 #elif defined (__i386__ ) && defined (__NetBSD__) && __NetBSD_Version__ > 105240000
  63     struct mtrr *mtrrp;
  64     int n;
  65
  66     mtrrp = malloc(sizeof (struct mtrr));
  67     mtrrp->base = base;
  68     mtrrp->len = size;
  69     mtrrp->type = type;
  70     mtrrp->flags = MTRR_VALID | MTRR_PRIVATE;
  71     n = 1;
  72
  73     if (i386_set_mtrr(mtrrp, &n) < 0) {
  74         free(mtrrp);
  75         return errno;
  76     }
  77     free(mtrrp);
  78     return 0;
  79 #else
  80     /* NetBSD prior to 1.5Y doesn't have MTRR support */
  81     return ENOSYS;
  82 #endif
  83 }