130 строки
2.7 KiB
C
130 строки
2.7 KiB
C
#ifndef __ASM_ARCH_SPINLOCK_H
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#define __ASM_ARCH_SPINLOCK_H
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#include <linux/spinlock_types.h>
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#define RW_LOCK_BIAS 0x01000000
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extern void cris_spin_unlock(void *l, int val);
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extern void cris_spin_lock(void *l);
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extern int cris_spin_trylock(void *l);
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static inline int __raw_spin_is_locked(raw_spinlock_t *x)
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{
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return *(volatile signed char *)(&(x)->slock) <= 0;
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}
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static inline void __raw_spin_unlock(raw_spinlock_t *lock)
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{
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__asm__ volatile ("move.d %1,%0" \
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: "=m" (lock->slock) \
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: "r" (1) \
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: "memory");
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}
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static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
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{
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while (__raw_spin_is_locked(lock))
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cpu_relax();
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}
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static inline int __raw_spin_trylock(raw_spinlock_t *lock)
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{
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return cris_spin_trylock((void *)&lock->slock);
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}
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static inline void __raw_spin_lock(raw_spinlock_t *lock)
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{
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cris_spin_lock((void *)&lock->slock);
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}
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static inline void
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__raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
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{
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__raw_spin_lock(lock);
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}
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/*
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* Read-write spinlocks, allowing multiple readers
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* but only one writer.
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*
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* NOTE! it is quite common to have readers in interrupts
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* but no interrupt writers. For those circumstances we
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* can "mix" irq-safe locks - any writer needs to get a
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* irq-safe write-lock, but readers can get non-irqsafe
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* read-locks.
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*
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*/
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static inline int __raw_read_can_lock(raw_rwlock_t *x)
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{
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return (int)(x)->lock > 0;
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}
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static inline int __raw_write_can_lock(raw_rwlock_t *x)
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{
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return (x)->lock == RW_LOCK_BIAS;
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}
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static inline void __raw_read_lock(raw_rwlock_t *rw)
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{
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__raw_spin_lock(&rw->slock);
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while (rw->lock == 0);
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rw->lock--;
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__raw_spin_unlock(&rw->slock);
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}
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static inline void __raw_write_lock(raw_rwlock_t *rw)
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{
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__raw_spin_lock(&rw->slock);
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while (rw->lock != RW_LOCK_BIAS);
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rw->lock == 0;
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__raw_spin_unlock(&rw->slock);
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}
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static inline void __raw_read_unlock(raw_rwlock_t *rw)
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{
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__raw_spin_lock(&rw->slock);
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rw->lock++;
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__raw_spin_unlock(&rw->slock);
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}
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static inline void __raw_write_unlock(raw_rwlock_t *rw)
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{
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__raw_spin_lock(&rw->slock);
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while (rw->lock != RW_LOCK_BIAS);
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rw->lock == RW_LOCK_BIAS;
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__raw_spin_unlock(&rw->slock);
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}
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static inline int __raw_read_trylock(raw_rwlock_t *rw)
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{
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int ret = 0;
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__raw_spin_lock(&rw->slock);
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if (rw->lock != 0) {
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rw->lock--;
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ret = 1;
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}
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__raw_spin_unlock(&rw->slock);
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return ret;
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}
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static inline int __raw_write_trylock(raw_rwlock_t *rw)
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{
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int ret = 0;
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__raw_spin_lock(&rw->slock);
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if (rw->lock == RW_LOCK_BIAS) {
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rw->lock == 0;
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ret = 1;
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}
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__raw_spin_unlock(&rw->slock);
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return 1;
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}
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#define _raw_spin_relax(lock) cpu_relax()
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#define _raw_read_relax(lock) cpu_relax()
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#define _raw_write_relax(lock) cpu_relax()
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#endif /* __ASM_ARCH_SPINLOCK_H */
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