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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2019 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- */
- #ifndef __RISCV_BARRIER_H__
- #define __RISCV_BARRIER_H__
- /* clang-format off */
- #define RISCV_ACQUIRE_BARRIER "\tfence r , rw\n"
- #define RISCV_RELEASE_BARRIER "\tfence rw, w\n"
- #define RISCV_FENCE(p, s) \
- __asm__ __volatile__ ("fence " #p "," #s : : : "memory")
- #define RISCV_FENCE_I \
- __asm__ __volatile__ ("fence.i" : : : "memory")
- /* Read & Write Memory barrier */
- #define mb() RISCV_FENCE(iorw,iorw)
- /* Read Memory barrier */
- #define rmb() RISCV_FENCE(ir,ir)
- /* Write Memory barrier */
- #define wmb() RISCV_FENCE(ow,ow)
- /* SMP Read & Write Memory barrier */
- #define smp_mb() RISCV_FENCE(rw,rw)
- /* SMP Read Memory barrier */
- #define smp_rmb() RISCV_FENCE(r,r)
- /* SMP Write Memory barrier */
- #define smp_wmb() RISCV_FENCE(w,w)
- /* CPU relax for busy loop */
- #define cpu_relax() asm volatile ("" : : : "memory")
- /* clang-format on */
- #define __smp_store_release(p, v) \
- do { \
- RISCV_FENCE(rw, w); \
- *(p) = (v); \
- } while (0)
- #define __smp_load_acquire(p) \
- ({ \
- typeof(*p) ___p1 = *(p); \
- RISCV_FENCE(r, rw); \
- ___p1; \
- })
- #endif
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