Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/arch/sh/include/asm/spinlock-cas.h
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/* SPDX-License-Identifier: GPL-2.0 * * include/asm-sh/spinlock-cas.h * * Copyright (C) 2015 SEI */ #ifndef __ASM_SH_SPINLOCK_CAS_H #define __ASM_SH_SPINLOCK_CAS_H #include <asm/barrier.h> #include <asm/processor.h> static inline unsigned __sl_cas(volatile unsigned *p, unsigned old, unsigned new) { __asm__ __volatile__("cas.l %1,%0,@r0" : "+r"(new) : "r"(old), "z"(p) : "t", "memory" ); return new; } /* * Your basic SMP spinlocks, allowing only a single CPU anywhere */ #define arch_spin_is_locked(x) ((x)->lock <= 0) static inline void arch_spin_lock(arch_spinlock_t *lock) { while (!__sl_cas(&lock->lock, 1, 0)); } static inline void arch_spin_unlock(arch_spinlock_t *lock) { __sl_cas(&lock->lock, 0, 1); } static inline int arch_spin_trylock(arch_spinlock_t *lock) { return __sl_cas(&lock->lock, 1, 0); } /* * Read-write spinlocks, allowing multiple readers but only one writer. * * NOTE! it is quite common to have readers in interrupts but no interrupt * writers. For those circumstances we can "mix" irq-safe locks - any writer * needs to get a irq-safe write-lock, but readers can get non-irqsafe * read-locks. */ static inline void arch_read_lock(arch_rwlock_t *rw) { unsigned old; do old = rw->lock; while (!old || __sl_cas(&rw->lock, old, old-1) != old); } static inline void arch_read_unlock(arch_rwlock_t *rw) { unsigned old; do old = rw->lock; while (__sl_cas(&rw->lock, old, old+1) != old); } static inline void arch_write_lock(arch_rwlock_t *rw) { while (__sl_cas(&rw->lock, RW_LOCK_BIAS, 0) != RW_LOCK_BIAS); } static inline void arch_write_unlock(arch_rwlock_t *rw) { __sl_cas(&rw->lock, 0, RW_LOCK_BIAS); } static inline int arch_read_trylock(arch_rwlock_t *rw) { unsigned old; do old = rw->lock; while (old && __sl_cas(&rw->lock, old, old-1) != old); return !!old; } static inline int arch_write_trylock(arch_rwlock_t *rw) { return __sl_cas(&rw->lock, RW_LOCK_BIAS, 0) == RW_LOCK_BIAS; } #endif /* __ASM_SH_SPINLOCK_CAS_H */
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