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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 <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "kernelhelper/dhahelper.h"
#include "libdha.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)
{
int dhahelper_fd;
dhahelper_fd = open("/dev/dhahelper",O_RDWR);
if(dhahelper_fd > 0)
{
int retval;
dhahelper_mtrr_t mtrrs;
mtrrs.operation = MTRR_OP_ADD;
mtrrs.start = base;
mtrrs.size = size;
mtrrs.type = type;
retval = ioctl(dhahelper_fd, DHAHELPER_ACK_IRQ, &mtrrs);
close(dhahelper_fd);
return retval;
}
#if 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
{
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,"%s",sout);
/*printf("MTRR: %s\n",sout);*/
fclose(mtrr_fd);
return wr_len == strlen(sout) ? 0 : EPERM;
}
}
#endif
return ENOSYS;
}
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