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[PATCH 3/6] Remove __get_clockfreq
With clock_getres, clock_gettime, and clock_settime refactor to remove the
generic CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID support through
hp-timing, there is no usage of internal __get_clockfreq. This patch removes
both generic and Linux implementation..
Checked with a build against aarch64-linux-gnu, i686-linux-gnu, ia64-linux-gnu,
sparc64-linux-gnu, powerpc-linux-gnu-power4.
* include/libc-internal.h (__get_clockfreq): Remove prototype.
* rt/Makefile (clock-routines): Remove get_clockfreq.
* rt/get_clockfreq.c: Remove file.
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c: Likewise.
* sysdeps/unix/sysv/linux/ia64/get_clockfreq.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c: Likewise.
* sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c: Move code to ...
* sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c: ... here.
---
include/libc-internal.h | 3 -
rt/Makefile | 2 +-
rt/get_clockfreq.c | 27 --
sysdeps/unix/sysv/linux/i386/get_clockfreq.c | 88 ------
sysdeps/unix/sysv/linux/ia64/get_clockfreq.c | 87 ------
.../unix/sysv/linux/powerpc/get_clockfreq.c | 107 --------
.../sysv/linux/powerpc/get_timebase_freq.c | 81 +++++-
.../sysv/linux/sparc/sparc64/get_clockfreq.c | 250 ------------------
8 files changed, 81 insertions(+), 564 deletions(-)
delete mode 100644 rt/get_clockfreq.c
delete mode 100644 sysdeps/unix/sysv/linux/i386/get_clockfreq.c
delete mode 100644 sysdeps/unix/sysv/linux/ia64/get_clockfreq.c
delete mode 100644 sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
delete mode 100644 sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c
diff --git a/include/libc-internal.h b/include/libc-internal.h
index 70edd77f81..db4d12432c 100644
--- a/include/libc-internal.h
+++ b/include/libc-internal.h
@@ -36,9 +36,6 @@ libc_hidden_proto (__profile_frequency)
extern void __cyg_profile_func_enter (void *this_fn, void *call_site);
extern void __cyg_profile_func_exit (void *this_fn, void *call_site);
-/* Get frequency of the system processor. */
-extern hp_timing_t __get_clockfreq (void);
-
/* Free all allocated resources. */
extern void __libc_freeres (void);
libc_hidden_proto (__libc_freeres)
diff --git a/rt/Makefile b/rt/Makefile
index 0789bb8db7..9ea8394565 100644
--- a/rt/Makefile
+++ b/rt/Makefile
@@ -28,7 +28,7 @@ aio-routines := aio_cancel aio_error aio_fsync aio_misc aio_read \
aio_read64 aio_return aio_suspend aio_write \
aio_write64 lio_listio lio_listio64 aio_sigqueue \
aio_notify
-clock-routines := get_clockfreq clock_getcpuclockid \
+clock-routines := clock_getcpuclockid \
clock_getres clock_gettime clock_settime \
clock_nanosleep
timer-routines := timer_create timer_delete timer_getoverr \
diff --git a/rt/get_clockfreq.c b/rt/get_clockfreq.c
deleted file mode 100644
index e62a7a5118..0000000000
--- a/rt/get_clockfreq.c
+++ /dev/null
@@ -1,27 +0,0 @@
-/* Get frequency of the system processor.
- Copyright (C) 2000-2019 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, see
- <http://www.gnu.org/licenses/>. */
-
-#include <libc-internal.h>
-
-hp_timing_t
-__get_clockfreq (void)
-{
- /* There is no generic way to find this out since we have in general
- no counter register either. */
- return 0;
-}
diff --git a/sysdeps/unix/sysv/linux/i386/get_clockfreq.c b/sysdeps/unix/sysv/linux/i386/get_clockfreq.c
deleted file mode 100644
index 621d52491b..0000000000
--- a/sysdeps/unix/sysv/linux/i386/get_clockfreq.c
+++ /dev/null
@@ -1,88 +0,0 @@
-/* Get frequency of the system processor. i386/Linux version.
- Copyright (C) 2000-2019 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, see
- <http://www.gnu.org/licenses/>. */
-
-#include <ctype.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-
-hp_timing_t
-__get_clockfreq (void)
-{
- /* We read the information from the /proc filesystem. It contains at
- least one line like
- cpu MHz : 497.840237
- or also
- cpu MHz : 497.841
- We search for this line and convert the number in an integer. */
- static hp_timing_t result;
- int fd;
-
- /* If this function was called before, we know the result. */
- if (result != 0)
- return result;
-
- fd = __open ("/proc/cpuinfo", O_RDONLY);
- if (__glibc_likely (fd != -1))
- {
- /* XXX AFAIK the /proc filesystem can generate "files" only up
- to a size of 4096 bytes. */
- char buf[4096];
- ssize_t n;
-
- n = __read (fd, buf, sizeof buf);
- if (__builtin_expect (n, 1) > 0)
- {
- char *mhz = memmem (buf, n, "cpu MHz", 7);
-
- if (__glibc_likely (mhz != NULL))
- {
- char *endp = buf + n;
- int seen_decpoint = 0;
- int ndigits = 0;
-
- /* 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';
- if (seen_decpoint)
- ++ndigits;
- }
- else if (*mhz == '.')
- seen_decpoint = 1;
-
- ++mhz;
- }
-
- /* Compensate for missing digits at the end. */
- while (ndigits++ < 6)
- result *= 10;
- }
- }
-
- __close (fd);
- }
-
- return result;
-}
diff --git a/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c b/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c
deleted file mode 100644
index 581f87f3e6..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* Get frequency of the system processor. IA-64/Linux version.
- Copyright (C) 2001-2019 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, see
- <http://www.gnu.org/licenses/>. */
-
-#include <ctype.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-
-
-hp_timing_t
-__get_clockfreq (void)
-{
- /* We read the information from the /proc filesystem. It contains at
- least one line like
- itc MHz : 733.390988
- We search for this line and convert the number in an integer. */
- static hp_timing_t result;
- int fd;
-
- /* If this function was called before, we know the result. */
- if (result != 0)
- return result;
-
- fd = __open ("/proc/cpuinfo", O_RDONLY);
- if (__builtin_expect (fd != -1, 1))
- {
- /* XXX AFAIK the /proc filesystem can generate "files" only up
- to a size of 4096 bytes. */
- char buf[4096];
- ssize_t n;
-
- n = __read (fd, buf, sizeof buf);
- if (__builtin_expect (n, 1) > 0)
- {
- char *mhz = memmem (buf, n, "itc MHz", 7);
-
- if (__builtin_expect (mhz != NULL, 1))
- {
- char *endp = buf + n;
- int seen_decpoint = 0;
- int ndigits = 0;
-
- /* 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';
- if (seen_decpoint)
- ++ndigits;
- }
- else if (*mhz == '.')
- seen_decpoint = 1;
-
- ++mhz;
- }
-
- /* Compensate for missing digits at the end. */
- while (ndigits++ < 6)
- result *= 10;
- }
- }
-
- __close (fd);
- }
-
- return result;
-}
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 98668fa718..0000000000
--- a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
+++ /dev/null
@@ -1,107 +0,0 @@
-/* Get frequency of the system processor. powerpc/Linux version.
- Copyright (C) 2000-2019 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, see
- <http://www.gnu.org/licenses/>. */
-
-#include <ctype.h>
-#include <fcntl.h>
-#include <stdint.h>
-#include <string.h>
-#include <unistd.h>
-#include <sysdep.h>
-#include <libc-vdso.h>
-#include <not-cancel.h>
-
-hp_timing_t
-__get_clockfreq (void)
-{
- hp_timing_t result = 0L;
-
-#ifdef SHARED
- /* The vDSO does not return an error (it clear cr0.so on returning). */
- INTERNAL_SYSCALL_DECL (err);
- result =
- INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, uint64_t, 0);
-#else
- /* 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. */
- int fd = __open_nocancel ("/proc/cpuinfo", O_RDONLY);
- if (__glibc_likely (fd != -1))
- return result;
-
- /* 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_nocancel (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_nocancel (fd, buf + half_buf, half_buf);
- }
- if (n >= 0)
- n += half_buf;
- }
- __close_nocancel (fd);
-
- if (__glibc_likely (n > 0))
- {
- char *mhz = memmem (buf, n, "timebase", 7);
-
- if (__glibc_likely (mhz != NULL))
- {
- 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;
- }
- }
- }
-#endif
-
- return result;
-}
diff --git a/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c b/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c
index 5903a909e3..23e7694d87 100644
--- a/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c
+++ b/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c
@@ -17,11 +17,90 @@
<http://www.gnu.org/licenses/>. */
#include <stdint.h>
+#include <string.h>
+
#include <libc-internal.h>
+#include <not-cancel.h>
+#include <libc-vdso.h>
uint64_t
__get_timebase_freq (void)
{
- return (uint64_t) __get_clockfreq ();
+ hp_timing_t result = 0L;
+
+#ifdef SHARED
+ /* The vDSO does not return an error (it clear cr0.so on returning). */
+ INTERNAL_SYSCALL_DECL (err);
+ result =
+ INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, uint64_t, 0);
+#else
+ /* 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. */
+ int fd = __open_nocancel ("/proc/cpuinfo", O_RDONLY);
+ if (__glibc_likely (fd != -1))
+ return result;
+
+ /* 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_nocancel (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_nocancel (fd, buf + half_buf, half_buf);
+ }
+ if (n >= 0)
+ n += half_buf;
+ }
+ __close_nocancel (fd);
+
+ if (__glibc_likely (n > 0))
+ {
+ char *mhz = memmem (buf, n, "timebase", 7);
+
+ if (__glibc_likely (mhz != NULL))
+ {
+ 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;
+ }
+ }
+ }
+#endif
+
+ return result;
}
weak_alias (__get_timebase_freq, __ppc_get_timebase_freq)
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c b/sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c
deleted file mode 100644
index 87853d6b6e..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c
+++ /dev/null
@@ -1,250 +0,0 @@
-/* Get frequency of the system processor. sparc64 version.
- Copyright (C) 2001-2019 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, see
- <http://www.gnu.org/licenses/>. */
-
-#include <ctype.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-#include <dirent.h>
-#include <stdlib.h>
-#include <inttypes.h>
-#include <sys/ioctl.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 dirent64 *dirp = (struct dirent64 *) buf;
- ssize_t len;
-
- while ((len = __getdents64 (obp_fd, (char *) dirp, sizeof (buf))) > 0)
- {
- struct dirent64 *this_dirp = dirp;
-
- while (len > 0)
- {
- char node[strlen ("/proc/openprom/")
- + _D_ALLOC_NAMLEN (this_dirp)
- + strlen ("/clock-frequency")];
- char *prop;
- int fd;
-
- /* Note that
- strlen("/clock-frequency") > strlen("/device_type")
- */
- __stpcpy (prop = __stpcpy (__stpcpy (node, "/proc/openprom/"),
- this_dirp->d_name),
- "/device_type");
- fd = __open (node, 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 (prop, "/clock-frequency");
- clkfreq_fd = __open (node, O_RDONLY);
- if (clkfreq_fd != -1)
- {
- if (__read (clkfreq_fd, type_string,
- sizeof (type_string)) > 0)
- result = (hp_timing_t)
- strtoumax (type_string, NULL, 16);
- __close (clkfreq_fd);
- }
- }
- __close (fd);
- }
-
- if (result != 0)
- break;
-
- len -= this_dirp->d_reclen;
- this_dirp = (struct dirent64 *)
- ((char *) this_dirp + this_dirp->d_reclen);
- }
- if (result != 0)
- break;
- }
- __close (obp_fd);
- }
-
- return result;
-}
-
-static void set_obp_int (struct openpromio *op, int val)
-{
- char *cp = op->oprom_array;
- int *ip = (int *) cp;
-
- *ip = val;
-}
-
-static int get_obp_int (struct openpromio *op)
-{
- char *cp = op->oprom_array;
- int *ip = (int *) cp;
-
- return *ip;
-}
-
-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);
- set_obp_int (obp_cmd, 0);
- ret = __ioctl (obp_dev_fd, OPROMCHILD, (char *) obp_cmd);
- if (ret == 0)
- {
- int cur_node = get_obp_int (obp_cmd);
-
- 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) get_obp_int (obp_cmd);
- }
- obp_cmd->oprom_size = sizeof (obp_buf) - sizeof (unsigned int);
- set_obp_int (obp_cmd, cur_node);
- ret = __ioctl (obp_dev_fd, OPROMNEXT, (char *) obp_cmd);
- if (ret < 0)
- break;
- cur_node = get_obp_int (obp_cmd);
- }
- }
- }
-
- 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;
-}
--
2.17.1