Il Fri, Dec 29, 2006 at 07:50:54PM -0700, David Hubbard ha scritto:
> Hi Rudolf,
>
> It looks like there is some code in the kernel that could be extended
> to provide MSR data for the coretemp driver--maybe you already know
> about this?
>
> >Btw, using /dev/cpuX/msr device you can read core temperatures, I just
> >copied the algorithm used by the kernel driver. Of course it's not
> >integrated with the rest of the hwmon subsystem...
> >If you're interested I can send you the source file as soon as I get
> >back to home.
I'm talking about an userspace application that read directly msr device
exposed by the kernel driver.
The program itself it's very trivial (I just added a bit of error checking so
it doesn't look so bad ;))
#include <stdio.h>
#include <stdint.h>
#define MSR_IA32_THERM_STATUS 0x019c
#define TJ_MAX 100
int main(void) {
int cpus = 2;
int i;
char msr_name[64];
FILE *msr;
uint64_t val;
int temp;
for (i = 0; i < cpus; i++) {
sprintf(msr_name, "/dev/cpu/%d/msr", i);
msr = fopen(msr_name, "r");
if (!msr) {
perror("fopen()");
return 1;
}
fseek(msr, MSR_IA32_THERM_STATUS, SEEK_SET);
fread(&val, 8, 1, msr);
fclose(msr);
/* Valid bit */
if (!(val & 0x80000000)) {
fprintf(stderr, "Invalid reading for CPU %d\n", i);
continue;
}
temp = TJ_MAX - ((val >> 16) & 0x7f);
printf("CPU%d: %d?C\n", i, temp);
}
return 0;
}
What Rudolf wants (AFAICS) is a mean to call into the msr module from
the kernel.
Luca
--
Recursion n.:
See Recursion.
