1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2018 ARM Limited
5 #ifndef __COMPAT_BARRIER_H
6 #define __COMPAT_BARRIER_H
10 * Warning: This code is meant to be used with
11 * ENABLE_COMPAT_VDSO only.
13 #ifndef ENABLE_COMPAT_VDSO
14 #error This header is meant to be used with ENABLE_COMPAT_VDSO only
21 #if __LINUX_ARM_ARCH__ >= 7
22 #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")
23 #elif __LINUX_ARM_ARCH__ == 6
24 #define dmb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
25 : : "r" (0) : "memory")
27 #define dmb(x) __asm__ __volatile__ ("" : : : "memory")
30 #if __LINUX_ARM_ARCH__ >= 8
31 #define aarch32_smp_mb() dmb(ish)
32 #define aarch32_smp_rmb() dmb(ishld)
33 #define aarch32_smp_wmb() dmb(ishst)
35 #define aarch32_smp_mb() dmb(ish)
36 #define aarch32_smp_rmb() aarch32_smp_mb()
37 #define aarch32_smp_wmb() dmb(ishst)
45 #define smp_mb() aarch32_smp_mb()
46 #define smp_rmb() aarch32_smp_rmb()
47 #define smp_wmb() aarch32_smp_wmb()
49 #endif /* !__ASSEMBLY__ */
51 #endif /* __COMPAT_BARRIER_H */