1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2001 - 2012 Tensilica Inc. 7 */ 8 9 #ifndef _XTENSA_SYSTEM_H 10 #define _XTENSA_SYSTEM_H 11 12 #define smp_read_barrier_depends() do { } while(0) 13 #define read_barrier_depends() do { } while(0) 14 15 #define mb() ({ __asm__ __volatile__("memw" : : : "memory"); }) 16 #define rmb() barrier() 17 #define wmb() mb() 18 19 #ifdef CONFIG_SMP 20 #error smp_* not defined 21 #else 22 #define smp_mb() barrier() 23 #define smp_rmb() barrier() 24 #define smp_wmb() barrier() 25 #endif 26 27 #define set_mb(var, value) do { var = value; mb(); } while (0) 28 29 #endif /* _XTENSA_SYSTEM_H */ 30