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https://codeberg.org/ziglang/zig.git
synced 2026-04-29 03:57:08 +03:00
Alex Rønne Petersen
66d97267c7
This excludes all headers in /usr/include/dev because that directory is bonkers huge (18M). We can add these on an as-needed basis.
50 lines
1.1 KiB
C
Vendored
50 lines
1.1 KiB
C
Vendored
/* $OpenBSD: atomic.h,v 1.5 2024/01/24 12:25:50 jca Exp $ */
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/* Public Domain */
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#ifndef _MACHINE_ATOMIC_H_
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#define _MACHINE_ATOMIC_H_
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#define __membar(_f) do {__asm volatile(_f ::: "memory"); } while (0)
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#define membar_enter() __membar("fence w,rw")
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#define membar_exit() __membar("fence rw,w")
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#define membar_producer() __membar("fence w,w")
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#define membar_consumer() __membar("fence r,r")
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#define membar_sync() __membar("fence rw,rw")
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#if defined(_KERNEL)
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/* virtio needs MP membars even on SP kernels */
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#define virtio_membar_producer() __membar("fence w,w")
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#define virtio_membar_consumer() __membar("fence r,r")
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#define virtio_membar_sync() __membar("fence rw,rw")
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/*
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* Set bits
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* *p = *p | v
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*/
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static inline void
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atomic_setbits_int(volatile unsigned int *p, unsigned int v)
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{
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__asm volatile("amoor.w zero, %1, %0"
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: "+A" (*p)
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: "r" (v)
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: "memory");
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}
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/*
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* Clear bits
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* *p = *p & (~v)
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*/
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static inline void
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atomic_clearbits_int(volatile unsigned int *p, unsigned int v)
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{
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__asm volatile("amoand.w zero, %1, %0"
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: "+A" (*p)
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: "r" (~v)
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: "memory");
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}
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#endif /* defined(_KERNEL) */
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#endif /* _MACHINE_ATOMIC_H_ */ |