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author | Anup Patel <anup.patel@wdc.com> | 2018-12-11 16:54:06 +0300 |
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committer | Anup Patel <anup@brainfault.org> | 2018-12-11 16:54:06 +0300 |
commit | 9e8ff05cb61f157fb0bcb6b0071d7b6dc0763faa (patch) | |
tree | b9513a86b3b36e569cb46387846fee9c5544f566 /include/sbi/riscv_barrier.h | |
download | opensbi-9e8ff05cb61f157fb0bcb6b0071d7b6dc0763faa.tar.xz |
Initial commit.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Diffstat (limited to 'include/sbi/riscv_barrier.h')
-rw-r--r-- | include/sbi/riscv_barrier.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/include/sbi/riscv_barrier.h b/include/sbi/riscv_barrier.h new file mode 100644 index 0000000..993cbda --- /dev/null +++ b/include/sbi/riscv_barrier.h @@ -0,0 +1,53 @@ +/* + * Copyright (c) 2018 Western Digital Corporation or its affiliates. + * + * Authors: + * Anup Patel <anup.patel@wdc.com> + * + * SPDX-License-Identifier: BSD-2-Clause + */ + +#ifndef __RISCV_BARRIER_H__ +#define __RISCV_BARRIER_H__ + +#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") + +/* 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") + +#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 |