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
  18  * along with MPlayer; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  *
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include "dha.h"
  29 #include "AsmMacros.h"
  30
  31 #if defined (__i386__) && defined (__NetBSD__)
  32 #include <sys/param.h>
  33 #if __NetBSD_Version__ > 105240000
  34 #include <stdint.h>
  35 #include <stdlib.h>
  36 #include <machine/mtrr.h>
  37 #include <machine/sysarch.h>
  38 #endif
  39 #endif
  40
  41 int     mtrr_set_type(unsigned base,unsigned size,int type)
  42 {
  43 #ifdef linux
  44     FILE * mtrr_fd;
  45     char * stype;
  46     switch(type)
  47     {
  48         case MTRR_TYPE_UNCACHABLE: stype = "uncachable"; break;
  49         case MTRR_TYPE_WRCOMB:     stype = "write-combining"; break;
  50         case MTRR_TYPE_WRTHROUGH:  stype = "write-through"; break;
  51         case MTRR_TYPE_WRPROT:     stype = "write-protect"; break;
  52         case MTRR_TYPE_WRBACK:     stype = "write-back"; break;
  53         default:                   return EINVAL;
  54     }
  55     mtrr_fd = fopen("/proc/mtrr","wt");
  56     if(mtrr_fd)
  57     {
  58         char sout[256];
  59         unsigned wr_len;
  60         sprintf(sout,"base=0x%08X size=0x%08X type=%s\n",base,size,stype);
  61         wr_len = fprintf(mtrr_fd,sout);
  62         /*printf("MTRR: %s\n",sout);*/
  63         fclose(mtrr_fd);
  64         return wr_len == strlen(sout) ? 0 : EPERM;
  65     }
  66     return ENOSYS;
  67 #elif defined (__i386__ ) && defined (__NetBSD__) && __NetBSD_Version__ > 105240000
  68     struct mtrr *mtrrp;
  69     int n;
  70
  71     mtrrp = malloc(sizeof (struct mtrr));
  72     mtrrp->base = base;
  73     mtrrp->len = size;
  74     mtrrp->type = type;
  75     mtrrp->flags = MTRR_VALID | MTRR_PRIVATE;
  76     n = 1;
  77
  78     if (i386_set_mtrr(mtrrp, &n) < 0) {
  79         free(mtrrp);
  80         return errno;
  81     }
  82     free(mtrrp);
  83     return 0;
  84 #else
  85     /* NetBSD prior to 1.5Y doesn't have MTRR support */
  86     return ENOSYS;
  87 #endif
  88 }