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/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "opal/mca/timer/timer.h"
#include "opal/mca/timer/linux/timer_linux.h"
#include "opal/constants.h"
opal_timer_t opal_timer_linux_freq;
static int opal_timer_linux_open(void);
const opal_timer_base_component_2_0_0_t mca_timer_linux_component = {
/* First, the mca_component_t struct containing meta information
about the component itself */
{
OPAL_TIMER_BASE_VERSION_2_0_0,
/* Component name and version */
"linux",
OPAL_MAJOR_VERSION,
OPAL_MINOR_VERSION,
OPAL_RELEASE_VERSION,
/* Component open and close functions */
opal_timer_linux_open,
NULL
},
{
/* The component is checkpoint ready */
MCA_BASE_METADATA_PARAM_CHECKPOINT
},
};
static char *
find_info(FILE* fp, char *str, char *buf, size_t buflen)
{
char *tmp;
rewind(fp);
while (NULL != fgets(buf, buflen, fp)) {
if (strncmp(buf, str, strlen(str)) == 0) {
/* we found the line. Now eat everything up to,
including, and one past the : */
for (tmp = buf ; (*tmp != '\0') && (*tmp != ':') ; ++tmp) ;
for ( ++tmp ; *tmp == ' ' ; ++tmp);
if ('\0' != *tmp) {
return tmp;
}
}
}
return NULL;
}
int
opal_timer_linux_open(void)
{
FILE *fp;
char *loc;
float cpu_f;
int ret;
char buf[1024];
fp = fopen("/proc/cpuinfo", "r");
if (NULL == fp) {
return OPAL_ERR_IN_ERRNO;
}
opal_timer_linux_freq = 0;
if (0 == opal_timer_linux_freq) {
/* first, look for a timebase field. probably only on PPC,
but one never knows */
loc = find_info(fp, "timebase", buf, 1024);
if (NULL != loc) {
int freq;
ret = sscanf(loc, "%d", &freq);
if (1 == ret) {
opal_timer_linux_freq = freq;
}
}
}
if (0 == opal_timer_linux_freq) {
/* find the CPU speed - most timers are 1:1 with CPU speed */
loc = find_info(fp, "cpu MHz", buf, 1024);
if (NULL != loc) {
ret = sscanf(loc, "%f", &cpu_f);
if (1 == ret) {
/* numer is in MHz - convert to Hz and make an integer */
opal_timer_linux_freq = (opal_timer_t) cpu_f * 1000000;
}
}
}
if (0 == opal_timer_linux_freq) {
/* look for the sparc way of getting cpu frequency */
loc = find_info(fp, "Cpu0ClkTck", buf, 1024);
if (NULL != loc) {
unsigned int freq;
ret = sscanf(loc, "%x", &freq);
if (1 == ret) {
opal_timer_linux_freq = freq;
}
}
}
fclose(fp);
return OPAL_SUCCESS;
}
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