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/*
mtrr.c - Stuff for optimizing memory access
Copyrights:
2002 - Linux version by Nick Kurshev
Licence: GPL
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "libdha.h"
#include "AsmMacros.h"
#if defined (__i386__) && defined (__NetBSD__)
#include <sys/param.h>
#if __NetBSD_Version__ > 105240000
#include <stdint.h>
#include <stdlib.h>
#include <machine/mtrr.h>
#include <machine/sysarch.h>
#endif
#endif
int mtrr_set_type(unsigned base,unsigned size,int type)
{
#ifdef linux
FILE * mtrr_fd;
char * stype;
switch(type)
{
case MTRR_TYPE_UNCACHABLE: stype = "uncachable"; break;
case MTRR_TYPE_WRCOMB: stype = "write-combining"; break;
case MTRR_TYPE_WRTHROUGH: stype = "write-through"; break;
case MTRR_TYPE_WRPROT: stype = "write-protect"; break;
case MTRR_TYPE_WRBACK: stype = "write-back"; break;
default: return EINVAL;
}
mtrr_fd = fopen("/proc/mtrr","wt");
if(mtrr_fd)
{
char sout[256];
unsigned wr_len;
sprintf(sout,"base=0x%08X size=0x%08X type=%s\n",base,size,stype);
wr_len = fprintf(mtrr_fd,sout);
/*printf("MTRR: %s\n",sout);*/
fclose(mtrr_fd);
return wr_len == strlen(sout) ? 0 : EPERM;
}
return ENOSYS;
#elif defined (__i386__ ) && defined (__NetBSD__) && __NetBSD_Version__ > 105240000
struct mtrr *mtrrp;
int n;
mtrrp = malloc(sizeof (struct mtrr));
mtrrp->base = base;
mtrrp->len = size;
mtrrp->type = type;
mtrrp->flags = MTRR_VALID | MTRR_PRIVATE;
n = 1;
if (i386_set_mtrr(mtrrp, &n) < 0) {
free(mtrrp);
return errno;
}
free(mtrrp);
return 0;
#else
/* NetBSD prior to 1.5Y doesn't have MTRR support */
return ENOSYS;
#endif
}
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