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/* Facilities specific to the PowerPC architecture
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 _SYS_PLATFORM_PPC_H
#define _SYS_PLATFORM_PPC_H 1
#include <features.h>
#include <stdint.h>
#include <bits/ppc.h>
/* Read the Time Base Register. */
static inline uint64_t
__ppc_get_timebase (void)
{
#if __GNUC_PREREQ (4, 8)
return __builtin_ppc_get_timebase ();
#else
# ifdef __powerpc64__
uint64_t __tb;
/* "volatile" is necessary here, because the user expects this assembly
isn't moved after an optimization. */
__asm__ volatile ("mfspr %0, 268" : "=r" (__tb));
return __tb;
# else /* not __powerpc64__ */
uint32_t __tbu, __tbl, __tmp; \
__asm__ volatile ("0:\n\t"
"mftbu %0\n\t"
"mftbl %1\n\t"
"mftbu %2\n\t"
"cmpw %0, %2\n\t"
"bne- 0b"
: "=r" (__tbu), "=r" (__tbl), "=r" (__tmp));
return (((uint64_t) __tbu << 32) | __tbl);
# endif /* not __powerpc64__ */
#endif
}
#endif /* sys/platform/ppc.h */
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