1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __ASM_BARRIER_H 10 #define __ASM_BARRIER_H 11 12 #ifndef __ASSEMBLY__ 13 14 /* TODO-vineetg: Need to see what this does, don't we need sync anywhere */ 15 #define mb() __asm__ __volatile__ ("" : : : "memory") 16 #define rmb() mb() 17 #define wmb() mb() 18 #define set_mb(var, value) do { var = value; mb(); } while (0) 19 #define set_wmb(var, value) do { var = value; wmb(); } while (0) 20 #define read_barrier_depends() mb() 21 22 /* TODO-vineetg verify the correctness of macros here */ 23 #ifdef CONFIG_SMP 24 #define smp_mb() mb() 25 #define smp_rmb() rmb() 26 #define smp_wmb() wmb() 27 #else 28 #define smp_mb() barrier() 29 #define smp_rmb() barrier() 30 #define smp_wmb() barrier() 31 #endif 32 33 #define smp_mb__before_atomic_dec() barrier() 34 #define smp_mb__after_atomic_dec() barrier() 35 #define smp_mb__before_atomic_inc() barrier() 36 #define smp_mb__after_atomic_inc() barrier() 37 38 #define smp_read_barrier_depends() do { } while (0) 39 40 #endif 41 42 #endif 43