1/* 2 * Copyright (c) 2005 Luca Barbato <lu_zero@gentoo.org> 3 * 4 * This file is part of Libav. 5 * 6 * Libav is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * Libav is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with Libav; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#ifndef AVUTIL_PPC_TIMER_H 22#define AVUTIL_PPC_TIMER_H 23 24#include <stdint.h> 25 26#define AV_READ_TIME read_time 27 28static inline uint64_t read_time(void) 29{ 30 uint32_t tbu, tbl, temp; 31 32 /* from section 2.2.1 of the 32-bit PowerPC PEM */ 33 __asm__ volatile( 34 "1:\n" 35 "mftbu %2\n" 36 "mftb %0\n" 37 "mftbu %1\n" 38 "cmpw %2,%1\n" 39 "bne 1b\n" 40 : "=r"(tbl), "=r"(tbu), "=r"(temp) 41 : 42 : "cc"); 43 44 return (((uint64_t)tbu)<<32) | (uint64_t)tbl; 45} 46 47#endif /* AVUTIL_PPC_TIMER_H */ 48