diff options
Diffstat (limited to 'include/asm-parisc/spinlock.h')
| -rw-r--r-- | include/asm-parisc/spinlock.h | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/include/asm-parisc/spinlock.h b/include/asm-parisc/spinlock.h deleted file mode 100644 index 7c3f406a746..00000000000 --- a/include/asm-parisc/spinlock.h +++ /dev/null @@ -1,146 +0,0 @@ -#ifndef __ASM_SPINLOCK_H -#define __ASM_SPINLOCK_H - -#include <asm/system.h> -#include <asm/processor.h> -#include <asm/spinlock_types.h> - -static inline int __raw_spin_is_locked(raw_spinlock_t *x) -{ - volatile unsigned int *a = __ldcw_align(x); - return *a == 0; -} - -#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) -#define __raw_spin_unlock_wait(x) \ - do { cpu_relax(); } while (__raw_spin_is_locked(x)) - -static inline void __raw_spin_lock(raw_spinlock_t *x) -{ - volatile unsigned int *a; - - mb(); - a = __ldcw_align(x); - while (__ldcw(a) == 0) - while (*a == 0); - mb(); -} - -static inline void __raw_spin_unlock(raw_spinlock_t *x) -{ - volatile unsigned int *a; - mb(); - a = __ldcw_align(x); - *a = 1; - mb(); -} - -static inline int __raw_spin_trylock(raw_spinlock_t *x) -{ - volatile unsigned int *a; - int ret; - - mb(); - a = __ldcw_align(x); - ret = __ldcw(a) != 0; - mb(); - - return ret; -} - -/* - * Read-write spinlocks, allowing multiple readers - * but only one writer. - */ - -#define __raw_read_trylock(lock) generic__raw_read_trylock(lock) - -/* read_lock, read_unlock are pretty straightforward. Of course it somehow - * sucks we end up saving/restoring flags twice for read_lock_irqsave aso. */ - -static __inline__ void __raw_read_lock(raw_rwlock_t *rw) -{ - unsigned long flags; - local_irq_save(flags); - __raw_spin_lock(&rw->lock); - - rw->counter++; - - __raw_spin_unlock(&rw->lock); - local_irq_restore(flags); -} - -static __inline__ void __raw_read_unlock(raw_rwlock_t *rw) -{ - unsigned long flags; - local_irq_save(flags); - __raw_spin_lock(&rw->lock); - - rw->counter--; - - __raw_spin_unlock(&rw->lock); - local_irq_restore(flags); -} - -/* write_lock is less trivial. We optimistically grab the lock and check - * if we surprised any readers. If so we release the lock and wait till - * they're all gone before trying again - * - * Also note that we don't use the _irqsave / _irqrestore suffixes here. - * If we're called with interrupts enabled and we've got readers (or other - * writers) in interrupt handlers someone fucked up and we'd dead-lock - * sooner or later anyway. prumpf */ - -static __inline__ void __raw_write_lock(raw_rwlock_t *rw) -{ -retry: - __raw_spin_lock(&rw->lock); - - if(rw->counter != 0) { - /* this basically never happens */ - __raw_spin_unlock(&rw->lock); - - while (rw->counter != 0) - cpu_relax(); - - goto retry; - } - - /* got it. now leave without unlocking */ - rw->counter = -1; /* remember we are locked */ -} - -/* write_unlock is absolutely trivial - we don't have to wait for anything */ - -static __inline__ void __raw_write_unlock(raw_rwlock_t *rw) -{ - rw->counter = 0; - __raw_spin_unlock(&rw->lock); -} - -static __inline__ int __raw_write_trylock(raw_rwlock_t *rw) -{ - __raw_spin_lock(&rw->lock); - if (rw->counter != 0) { - /* this basically never happens */ - __raw_spin_unlock(&rw->lock); - - return 0; - } - - /* got it. now leave without unlocking */ - rw->counter = -1; /* remember we are locked */ - return 1; -} - -static __inline__ int __raw_is_read_locked(raw_rwlock_t *rw) -{ - return rw->counter > 0; -} - -static __inline__ int __raw_is_write_locked(raw_rwlock_t *rw) -{ - return rw->counter < 0; -} - -#endif /* __ASM_SPINLOCK_H */ |
