1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copied from the kernel sources: 4 * 5 * Copyright IBM Corp. 1999, 2009 6 * 7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 8 */ 9 10 #ifndef __TOOLS_LINUX_ASM_BARRIER_H 11 #define __TOOLS_LINUX_ASM_BARRIER_H 12 13 /* 14 * Force strict CPU ordering. 15 * And yes, this is required on UP too when we're talking 16 * to devices. 17 */ 18 19 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES 20 /* Fast-BCR without checkpoint synchronization */ 21 #define __ASM_BARRIER "bcr 14,0\n" 22 #else 23 #define __ASM_BARRIER "bcr 15,0\n" 24 #endif 25 26 #define mb() do { asm volatile(__ASM_BARRIER : : : "memory"); } while (0) 27 28 #define rmb() mb() 29 #define wmb() mb() 30 31 #endif /* __TOOLS_LIB_ASM_BARRIER_H */ 32