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Manual for platform-specific features and new __ppc_get_timebase inline.

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[BZ #13743]
A new class of installed headers has been documented for low-level
platform-specific functionality.  PowerPC added the first instance with a
function to provide time base register access (__ppc_get_timebase).  This
is required for applications that measure time at high frequencies with
high precision that can't afford a syscall.
This commit is contained in:
Tulio Magno Quites Machado Filho
2012-06-04 13:46:37 -05:00
committed by Ryan S. Arnold
parent 06775cb82b
commit d9dc34cd56
9 changed files with 238 additions and 12 deletions
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46
sysdeps/powerpc/test-gettimebase.c Normal file
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/* Check __ppc_get_timebase() 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() is compatible with the current processor and if
it's changing between reads. A read failure might indicate a Power ISA or
binutils change. */
#include <inttypes.h>
#include <stdio.h>
#include <sys/platform/ppc.h>
static int
do_test (void)
{
uint64_t t1, t2, t3;
t1 = __ppc_get_timebase ();
printf ("Time Base = %"PRIu64"\n", t1);
t2 = __ppc_get_timebase ();
printf ("Time Base = %"PRIu64"\n", t2);
t3 = __ppc_get_timebase ();
printf ("Time Base = %"PRIu64"\n", t3);
if (t1 != t2 && t1 != t3 && t2 != t3)
return 0;
printf ("Fail: timebase reads should always be different.");
return 1;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"