| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2018 ARM Limited |
| */ |
| #ifndef __COMPAT_BARRIER_H |
| #define __COMPAT_BARRIER_H |
| |
| #ifndef __ASSEMBLY__ |
| /* |
| * Warning: This code is meant to be used with |
| * ENABLE_COMPAT_VDSO only. |
| */ |
| #ifndef ENABLE_COMPAT_VDSO |
| #error This header is meant to be used with ENABLE_COMPAT_VDSO only |
| #endif |
| |
| #ifdef dmb |
| #undef dmb |
| #endif |
| |
| #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory") |
| |
| #if __LINUX_ARM_ARCH__ >= 8 && defined(CONFIG_AS_DMB_ISHLD) |
| #define aarch32_smp_mb() dmb(ish) |
| #define aarch32_smp_rmb() dmb(ishld) |
| #define aarch32_smp_wmb() dmb(ishst) |
| #else |
| #define aarch32_smp_mb() dmb(ish) |
| #define aarch32_smp_rmb() aarch32_smp_mb() |
| #define aarch32_smp_wmb() dmb(ishst) |
| #endif |
| |
| |
| #undef smp_mb |
| #undef smp_rmb |
| #undef smp_wmb |
| |
| #define smp_mb() aarch32_smp_mb() |
| #define smp_rmb() aarch32_smp_rmb() |
| #define smp_wmb() aarch32_smp_wmb() |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* __COMPAT_BARRIER_H */ |
