diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c deleted file mode 100644 index 6d2e766aa4..0000000000 --- a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c +++ /dev/null @@ -1,117 +0,0 @@ -/* Get frequency of the system processor. powerpc/Linux version. - Copyright (C) 2000, 2001, 2005 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 Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; 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 <libc-internal.h> -#include <sysdep.h> -#include <bits/libc-vdso.h> - -hp_timing_t -__get_clockfreq (void) -{ - /* We read the information from the /proc filesystem. /proc/cpuinfo - contains at least one line like: - timebase : 33333333 - We search for this line and convert the number into an integer. */ - static hp_timing_t timebase_freq; - hp_timing_t result = 0L; - - /* If this function was called before, we know the result. */ - if (timebase_freq != 0) - return timebase_freq; - - /* If we can use the vDSO to obtain the timebase even better. */ -#ifdef SHARED - INTERNAL_SYSCALL_DECL (err); - timebase_freq = INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, 0); - if (INTERNAL_SYSCALL_ERROR_P (timebase_freq, err) - && INTERNAL_SYSCALL_ERRNO (timebase_freq, err) == ENOSYS) -#endif - { - int fd = open ("/proc/cpuinfo", O_RDONLY); - - if (__builtin_expect (fd != -1, 1)) - { - /* The timebase will be in the 1st 1024 bytes for systems with up - to 8 processors. If the first read returns less then 1024 - bytes read, we have the whole cpuinfo and can start the scan. - Otherwise we will have to read more to insure we have the - timebase value in the scan. */ - char buf[1024]; - ssize_t n; - - n = read (fd, buf, sizeof (buf)); - if (n == sizeof (buf)) - { - /* We are here because the 1st read returned exactly sizeof - (buf) bytes. This implies that we are not at EOF and may - not have read the timebase value yet. So we need to read - more bytes until we know we have EOF. We copy the lower - half of buf to the upper half and read sizeof (buf)/2 - bytes into the lower half of buf and repeat until we - reach EOF. We can assume that the timebase will be in - the last 512 bytes of cpuinfo, so two 512 byte half_bufs - will be sufficient to contain the timebase and will - handle the case where the timebase spans the half_buf - boundry. */ - const ssize_t half_buf = sizeof (buf) / 2; - while (n >= half_buf) - { - memcpy (buf, buf + half_buf, half_buf); - n = read (fd, buf + half_buf, half_buf); - } - if (n >= 0) - n += half_buf; - } - - if (__builtin_expect (n, 1) > 0) - { - char *mhz = memmem (buf, n, "timebase", 7); - - if (__builtin_expect (mhz != NULL, 1)) - { - char *endp = buf + n; - - /* Search for the beginning of the string. */ - while (mhz < endp && (*mhz < '0' || *mhz > '9') - && *mhz != '\n') - ++mhz; - - while (mhz < endp && *mhz != '\n') - { - if (*mhz >= '0' && *mhz <= '9') - { - result *= 10; - result += *mhz - '0'; - } - - ++mhz; - } - } - timebase_freq = result; - } - close (fd); - } - } - - return timebase_freq; -} |