Add __ppc_get_timebase_freq to ppc.h.

1 files changed, 62 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c b/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c
new file mode 100644
index 0000000000..a3f3bd6f55
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c
@@ -0,0 +1,62 @@
+/* Check __ppc_get_timebase_freq() for architecture changes
+   Copyright (C) 2012 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/>.  */
+
+/* Test if __ppc_get_timebase_freq() works and is different from zero.  A read
+   failure might indicate a Linux Kernel change.
+   This test also use the frequency to compute the real elapsed time.  */
+
+#include <inttypes.h>
+#include <stdio.h>
+
+#include <sys/platform/ppc.h>
+
+/* Maximum value of the Time Base Register: 2^60 - 1.  */
+#define MAX_TB 0xFFFFFFFFFFFFFFF
+
+static int
+do_test (void)
+{
+  uint64_t t1, t2, f, diff;
+
+  t1 = __ppc_get_timebase ();
+  printf ("t1 = %"PRIu64"\n", t1);
+
+  f = __ppc_get_timebase_freq ();
+  printf ("Time Base frequency = %"PRIu64" Hz\n", f);
+
+  if (f == 0) {
+      printf ("Fail: The time base frequency can't be zero.");
+      return 1;
+  }
+
+  t2 = __ppc_get_timebase ();
+  printf ("t2 = %"PRIu64"\n", t2);
+
+  if (t2 > t1) {
+    diff = t2 - t1;
+  } else {
+    diff = (MAX_TB - t2) + t1;
+  }
+
+  printf ("Elapsed time  = %1.2f usecs\n", (double) diff * 1000000 / f );
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"