1 /* MN10300 memory barrier definitions 2 * 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public Licence 8 * as published by the Free Software Foundation; either version 9 * 2 of the Licence, or (at your option) any later version. 10 */ 11 #ifndef _ASM_BARRIER_H 12 #define _ASM_BARRIER_H 13 14 #define nop() asm volatile ("nop") 15 16 #define mb() asm volatile ("": : :"memory") 17 #define rmb() mb() 18 #define wmb() asm volatile ("": : :"memory") 19 20 #ifdef CONFIG_SMP 21 #define smp_mb() mb() 22 #define smp_rmb() rmb() 23 #define smp_wmb() wmb() 24 #define set_mb(var, value) do { xchg(&var, value); } while (0) 25 #else /* CONFIG_SMP */ 26 #define smp_mb() barrier() 27 #define smp_rmb() barrier() 28 #define smp_wmb() barrier() 29 #define set_mb(var, value) do { var = value; mb(); } while (0) 30 #endif /* CONFIG_SMP */ 31 32 #define set_wmb(var, value) do { var = value; wmb(); } while (0) 33 34 #define read_barrier_depends() do {} while (0) 35 #define smp_read_barrier_depends() do {} while (0) 36 37 #endif /* _ASM_BARRIER_H */ 38