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#ifndef _SPARC64_SEMAPHORE_H
#define _SPARC64_SEMAPHORE_H
/* These are actually reasonable on the V9. */
#ifdef __KERNEL__
#include <asm/atomic.h>
#include <asm/system.h>
struct semaphore {
atomic_t count;
atomic_t waking;
struct wait_queue * wait;
};
#define MUTEX ((struct semaphore) { ATOMIC_INIT(1), ATOMIC_INIT(0), NULL })
#define MUTEX_LOCKED ((struct semaphore) { ATOMIC_INIT(0), ATOMIC_INIT(0), NULL })
extern void __down(struct semaphore * sem);
extern int __down_interruptible(struct semaphore * sem);
extern void __up(struct semaphore * sem);
#define sema_init(sem, val) atomic_set(&((sem)->count), val)
#define wake_one_more(sem) atomic_inc(&sem->waking);
static __inline__ int waking_non_zero(struct semaphore *sem)
{
int ret;
__asm__ __volatile__("
1: ldsw [%1], %%g5
brlez,pt %%g5, 2f
mov 0, %0
sub %%g5, 1, %%g7
cas [%1], %%g5, %%g7
cmp %%g5, %%g7
bne,pn %%icc, 1b
mov 1, %0
2:" : "=r" (ret)
: "r" (&((sem)->waking))
: "g5", "g7", "cc", "memory");
return ret;
}
extern __inline__ void down(struct semaphore * sem)
{
int result;
result = atomic_dec_return(&sem->count);
membar("#StoreLoad | #StoreStore");
if (result < 0)
__down(sem);
}
extern __inline__ int down_interruptible(struct semaphore *sem)
{
int result, ret = 0;
result = atomic_dec_return(&sem->count);
membar("#StoreLoad | #StoreStore");
if (result < 0)
ret = __down_interruptible(sem);
return ret;
}
extern __inline__ void up(struct semaphore * sem)
{
membar("#StoreStore | #LoadStore");
if (atomic_inc_return(&sem->count) <= 0)
__up(sem);
}
#endif /* __KERNEL__ */
#endif /* !(_SPARC64_SEMAPHORE_H) */
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