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ef5b70affc
Use this for enabling the ppc timer.h implementation only on assemblers that support labels in the inline assembly. Signed-off-by: Martin Storsjö <martin@martin.st>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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* Copyright (c) 2005 Luca Barbato <lu_zero@gentoo.org>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_PPC_TIMER_H
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#define AVUTIL_PPC_TIMER_H
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#include <stdint.h>
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#include "config.h"
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#if HAVE_INLINE_ASM_LABELS
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#define AV_READ_TIME read_time
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static inline uint64_t read_time(void)
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{
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uint32_t tbu, tbl, temp;
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/* from section 2.2.1 of the 32-bit PowerPC PEM */
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__asm__ volatile(
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"1:\n"
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"mftbu %2\n"
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"mftb %0\n"
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"mftbu %1\n"
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"cmpw %2,%1\n"
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"bne 1b\n"
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: "=r"(tbl), "=r"(tbu), "=r"(temp)
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:
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: "cc");
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return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
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}
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#endif /* HAVE_INLINE_ASM_LABELS */
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#endif /* AVUTIL_PPC_TIMER_H */
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