Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/arch/sh/include/asm/cmpxchg-xchg.h
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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_SH_CMPXCHG_XCHG_H #define __ASM_SH_CMPXCHG_XCHG_H /* * Copyright (C) 2016 Red Hat, Inc. * Author: Michael S. Tsirkin <mst@redhat.com> */ #include <linux/bits.h> #include <linux/compiler.h> #include <asm/byteorder.h> /* * Portable implementations of 1 and 2 byte xchg using a 4 byte cmpxchg. * Note: this header isn't self-contained: before including it, __cmpxchg_u32 * must be defined first. */ static inline u32 __xchg_cmpxchg(volatile void *ptr, u32 x, int size) { int off = (unsigned long)ptr % sizeof(u32); volatile u32 *p = ptr - off; #ifdef __BIG_ENDIAN int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE; #else int bitoff = off * BITS_PER_BYTE; #endif u32 bitmask = ((0x1 << size * BITS_PER_BYTE) - 1) << bitoff; u32 oldv, newv; u32 ret; do { oldv = READ_ONCE(*p); ret = (oldv & bitmask) >> bitoff; newv = (oldv & ~bitmask) | (x << bitoff); } while (__cmpxchg_u32(p, oldv, newv) != oldv); return ret; } static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val) { return __xchg_cmpxchg(m, val, sizeof *m); } static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) { return __xchg_cmpxchg(m, val, sizeof *m); } #endif /* __ASM_SH_CMPXCHG_XCHG_H */
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