1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2018 ARM Limited 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun #ifndef __COMPAT_BARRIER_H 6*4882a593Smuzhiyun #define __COMPAT_BARRIER_H 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * Warning: This code is meant to be used with 11*4882a593Smuzhiyun * ENABLE_COMPAT_VDSO only. 12*4882a593Smuzhiyun */ 13*4882a593Smuzhiyun #ifndef ENABLE_COMPAT_VDSO 14*4882a593Smuzhiyun #error This header is meant to be used with ENABLE_COMPAT_VDSO only 15*4882a593Smuzhiyun #endif 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #ifdef dmb 18*4882a593Smuzhiyun #undef dmb 19*4882a593Smuzhiyun #endif 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory") 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun #if __LINUX_ARM_ARCH__ >= 8 && defined(CONFIG_AS_DMB_ISHLD) 24*4882a593Smuzhiyun #define aarch32_smp_mb() dmb(ish) 25*4882a593Smuzhiyun #define aarch32_smp_rmb() dmb(ishld) 26*4882a593Smuzhiyun #define aarch32_smp_wmb() dmb(ishst) 27*4882a593Smuzhiyun #else 28*4882a593Smuzhiyun #define aarch32_smp_mb() dmb(ish) 29*4882a593Smuzhiyun #define aarch32_smp_rmb() aarch32_smp_mb() 30*4882a593Smuzhiyun #define aarch32_smp_wmb() dmb(ishst) 31*4882a593Smuzhiyun #endif 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #undef smp_mb 35*4882a593Smuzhiyun #undef smp_rmb 36*4882a593Smuzhiyun #undef smp_wmb 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun #define smp_mb() aarch32_smp_mb() 39*4882a593Smuzhiyun #define smp_rmb() aarch32_smp_rmb() 40*4882a593Smuzhiyun #define smp_wmb() aarch32_smp_wmb() 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #endif /* !__ASSEMBLY__ */ 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #endif /* __COMPAT_BARRIER_H */ 45