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/* Get frequency of the system processor. sparc64 version.
Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <ctype.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <libc-internal.h>
#include <asm/openpromio.h>
static hp_timing_t
__get_clockfreq_via_cpuinfo (void)
{
hp_timing_t result;
int fd;
result = 0;
fd = open ("/proc/cpuinfo", O_RDONLY);
if (fd != -1)
{
char buf[8192];
ssize_t n;
n = read (fd, buf, sizeof buf);
if (n > 0)
{
char *mhz = memmem (buf, n, "Cpu0ClkTck", 7);
if (mhz != NULL)
{
char *endp = buf + n;
/* Search for the beginning of the string. */
while (mhz < endp
&& (*mhz < '0' || *mhz > '9')
&& (*mhz < 'a' || *mhz > 'f')
&& *mhz != '\n')
++mhz;
while (mhz < endp && *mhz != '\n')
{
if ((*mhz >= '0' && *mhz <= '9') ||
(*mhz >= 'a' && *mhz <= 'f'))
{
result <<= 4;
if (*mhz >= '0' && *mhz <= '9')
result += *mhz - '0';
else
result += (*mhz - 'a') + 10;
}
++mhz;
}
}
}
close (fd);
}
return result;
}
static hp_timing_t
__get_clockfreq_via_proc_openprom (void)
{
hp_timing_t result;
int obp_fd;
result = 0;
obp_fd = open ("/proc/openprom", O_RDONLY);
if (obp_fd != -1)
{
unsigned long int buf[4096 / sizeof (unsigned long int)];
struct dirent *dirp = (struct dirent *) buf;
off_t dbase = (off_t) 0;
ssize_t len;
while ((len = getdirentries (obp_fd, (char *) dirp,
sizeof (buf), &dbase)) > 0)
{
struct dirent *this_dirp = dirp;
while (len > 0)
{
char node_name[strlen ("/proc/openprom/")
+ _D_ALLOC_NAMLEN (this_dirp)
+ strlen ("/clock-frequency")];
int fd;
/* Note that
strlen("/clock-frequency") > strlen("/device_type")
*/
stpcpy (stpcpy (stpcpy (node_name, "/proc/openprom/"),
this_dirp->d_name),
"/device_type");
fd = open (node_name, O_RDONLY);
if (fd != -1)
{
char type_string[128];
int ret;
ret = read (fd, type_string, sizeof (type_string));
if (ret > 0 && strncmp (type_string, "'cpu'", 5) == 0)
{
int clkfreq_fd;
stpcpy (stpcpy (stpcpy (node_name, "/proc/openprom/"),
this_dirp->d_name),
"/clock-frequency");
clkfreq_fd = open (node_name, O_RDONLY);
if (fd != -1)
{
if (read (clkfreq_fd, type_string,
sizeof (type_string)) > 0)
result = (hp_timing_t)
strtoull (type_string, NULL, 16);
close (clkfreq_fd);
}
}
close (fd);
}
if (result != 0)
break;
len -= this_dirp->d_reclen;
this_dirp = (struct dirent *)
((char *) this_dirp + this_dirp->d_reclen);
}
if (result != 0)
break;
}
close (obp_fd);
}
return result;
}
static hp_timing_t
__get_clockfreq_via_dev_openprom (void)
{
hp_timing_t result;
int obp_dev_fd;
result = 0;
obp_dev_fd = open ("/dev/openprom", O_RDONLY);
if (obp_dev_fd != -1)
{
char obp_buf[8192];
struct openpromio *obp_cmd = (struct openpromio *)obp_buf;
int ret;
obp_cmd->oprom_size =
sizeof (obp_buf) - sizeof (unsigned int);
*(int *) obp_cmd->oprom_array = 0;
ret = ioctl (obp_dev_fd, OPROMCHILD, (char *) obp_cmd);
if (ret == 0)
{
int cur_node = *(int *) obp_cmd->oprom_array;
while (cur_node != 0 && cur_node != -1)
{
obp_cmd->oprom_size = sizeof (obp_buf) - sizeof (unsigned int);
strcpy (obp_cmd->oprom_array, "device_type");
ret = ioctl (obp_dev_fd, OPROMGETPROP, (char *) obp_cmd);
if (ret == 0
&& strncmp (obp_cmd->oprom_array, "cpu", 3) == 0)
{
obp_cmd->oprom_size = (sizeof (obp_buf)
- sizeof (unsigned int));
strcpy (obp_cmd->oprom_array, "clock-frequency");
ret = ioctl (obp_dev_fd, OPROMGETPROP, (char *) obp_cmd);
if (ret == 0)
result =
(hp_timing_t) *(unsigned int *) obp_cmd->oprom_array;
}
obp_cmd->oprom_size = sizeof (obp_buf) - sizeof (unsigned int);
*(int *) obp_cmd->oprom_array = cur_node;
ret = ioctl (obp_dev_fd, OPROMNEXT, (char *) obp_cmd);
if (ret < 0)
break;
cur_node = *(int *)obp_cmd->oprom_array;
}
}
}
return result;
}
hp_timing_t
__get_clockfreq (void)
{
static hp_timing_t result;
/* If this function was called before, we know the result. */
if (result != 0)
return result;
/* We first read the information from the /proc/cpuinfo file.
It contains at least one line like
Cpu0ClkTick : 000000002cb41780
We search for this line and convert the number in an integer. */
result = __get_clockfreq_via_cpuinfo ();
if (result != 0)
return result;
/* If that did not work, try to find an OpenPROM node
with device_type equal to 'cpu' using /dev/openprom
and fetch the clock-frequency property from there. */
result = __get_clockfreq_via_dev_openprom ();
if (result != 0)
return result;
/* Finally, try the same lookup as above but using /proc/openprom. */
result = __get_clockfreq_via_proc_openprom ();
return result;
}
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