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#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
/* Complement BSD variants not found via types.h */
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
#define lseek64 lseek
#define off64_t off_t
#endif
#include <errno.h>
#include "os.h"
#include "geode.h"
static int
_msr_open(void)
{
static int msrfd = 0;
if (msrfd == 0) {
msrfd = open("/dev/cpu/0/msr", O_RDWR);
if (msrfd == -1)
ErrorF("Unable to open /dev/cpu/0/msr: %d\n", errno);
}
return msrfd;
}
int
GeodeReadMSR(unsigned long addr, unsigned long *lo, unsigned long *hi)
{
unsigned int data[2];
int fd = _msr_open();
int ret;
if (fd == -1)
return -1;
ret = lseek64(fd, (off64_t) addr, SEEK_SET);
if (ret == -1)
return -1;
ret = read(fd, (void *)data, sizeof(data));
if (ret != 8)
return -1;
*hi = data[1];
*lo = data[0];
return 0;
}
int
GeodeWriteMSR(unsigned long addr, unsigned long lo, unsigned long hi)
{
unsigned int data[2];
int fd = _msr_open();
if (fd == -1)
return -1;
if (lseek64(fd, (off64_t) addr, SEEK_SET) == -1)
return -1;
data[0] = lo;
data[1] = hi;
if (write(fd, (void *)data, 8) != 8)
return -1;
return 0;
}
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