+2012-09-25 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
+
+ * manual/platform.texi (PowerPC): Document __ppc_get_timebase_freq.
+ * sysdeps/powerpc/sys/platform/ppc.h: Include the operating
+ system header.
+ * sysdeps/unix/sysv/linux/powerpc/Makefile (sysdep_headers):
+ Likewise.
+ (sydep_routines): Add the new and the internal functions.
+ * sysdeps/unix/sysv/linux/powerpc/bits/ppc.h: New file.
+ * sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c: Likewise.
+ * sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions
+ (GLIBC_2.17): Add the new function.
+ * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/nptl/libc.abilist
+ (GLIBC_2.17): Likewise.
+ * sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions
+ (GLIBC_2.17): Likewise.
+ * sysdeps/unix/sysv/linux/powerpc/powerpc64/nptl/libc.abilist
+ (GLIBC_2.17): Likewise.
+ * sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c: New file.
+
2012-09-25 Alan Modra <amodra@gmail.com>
* sysdeps/unix/sysv/linux/powerpc/pthread_once.c (__pthread_once):
without requiring assistance from the operating system, so it is very
efficient.
@end deftypefun
+
+@deftypefun {uint64_t} __ppc_get_timebase_freq (void)
+Read the current frequency at which the Time Base Register is updated.
+
+This frequency is not related to the processor clock or the bus clock.
+It is also possible that this frequency is not constant. More information is
+available in @cite{Power ISA 2.06b - Book II - Section 5.2}.
+@end deftypefun
#define _SYS_PLATFORM_PPC_H 1
#include <stdint.h>
+#include <bits/ppc.h>
/* Read the Time Base Register. */
static inline uint64_t
ifeq ($(subdir),elf)
sysdep_routines += dl-vdso
endif
+
+ifeq ($(subdir),misc)
+sysdep_headers += bits/ppc.h
+sysdep_routines += get_clockfreq get_timebase_freq
+tests += test-gettimebasefreq
+endif
--- /dev/null
+/* Facilities specific to the PowerPC architecture on Linux
+ 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/>. */
+
+#ifndef _BITS_PPC_H
+#define _BITS_PPC_H
+
+#ifndef _SYS_PLATFORM_PPC_H
+# error "Never include this file directly; use <sys/platform/ppc.h> instead."
+#endif
+
+__BEGIN_DECLS
+
+/* Read the time base frequency. */
+extern uint64_t __ppc_get_timebase_freq (void);
+
+__END_DECLS
+
+#endif
--- /dev/null
+/* Get the frequency of the time base.
+ 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/>. */
+
+#include <libc-internal.h>
+
+uint64_t
+__get_timebase_freq (void)
+{
+ return (uint64_t) __get_clockfreq ();
+}
+weak_alias (__get_timebase_freq, __ppc_get_timebase_freq)
GLIBC_2.11 {
fallocate64;
}
+ GLIBC_2.17 {
+ __ppc_get_timebase_freq;
+ }
}
GLIBC_2.17
GLIBC_2.17 A
secure_getenv F
+ __ppc_get_timebase_freq F
GLIBC_2.2
GLIBC_2.2 A
_IO_adjust_wcolumn F
setcontext;
swapcontext;
}
+ GLIBC_2.17 {
+ __ppc_get_timebase_freq;
+ }
}
GLIBC_2.17
GLIBC_2.17 A
secure_getenv F
+ __ppc_get_timebase_freq F
GLIBC_2.3
GLIBC_2.3 A
_Exit F
--- /dev/null
+/* 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"
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