1 /* 2 * Based on arch/arm/include/asm/barrier.h 3 * 4 * Copyright (C) 2012 ARM Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 #ifndef __ASM_BARRIER_H 19 #define __ASM_BARRIER_H 20 21 #ifndef __ASSEMBLY__ 22 23 #define sev() asm volatile("sev" : : : "memory") 24 #define wfe() asm volatile("wfe" : : : "memory") 25 #define wfi() asm volatile("wfi" : : : "memory") 26 27 #define isb() asm volatile("isb" : : : "memory") 28 #define dsb() asm volatile("dsb sy" : : : "memory") 29 30 #define mb() dsb() 31 #define rmb() asm volatile("dsb ld" : : : "memory") 32 #define wmb() asm volatile("dsb st" : : : "memory") 33 34 #ifndef CONFIG_SMP 35 #define smp_mb() barrier() 36 #define smp_rmb() barrier() 37 #define smp_wmb() barrier() 38 #else 39 #define smp_mb() asm volatile("dmb ish" : : : "memory") 40 #define smp_rmb() asm volatile("dmb ishld" : : : "memory") 41 #define smp_wmb() asm volatile("dmb ishst" : : : "memory") 42 #endif 43 44 #define read_barrier_depends() do { } while(0) 45 #define smp_read_barrier_depends() do { } while(0) 46 47 #define set_mb(var, value) do { var = value; smp_mb(); } while (0) 48 #define nop() asm volatile("nop"); 49 50 #endif /* __ASSEMBLY__ */ 51 52 #endif /* __ASM_BARRIER_H */ 53