1 files changed, 107 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
new file mode 100644
index 0000000000..b8d01d8ca6
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
@@ -0,0 +1,107 @@
+/* Get frequency of the system processor.  powerpc/Linux version.
+   Copyright (C) 2000-2017 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_not_cancel_2 ("/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;
+}