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#ifndef _SPARC_SEMAPHORE_H
#define _SPARC_SEMAPHORE_H
/* Dinky, good for nothing, just barely irq safe, Sparc semaphores. */
#ifdef __KERNEL__
#include <asm/atomic.h>
#include <linux/wait.h>
struct semaphore {
atomic_t count;
atomic_t waking;
wait_queue_head_t wait;
#if WAITQUEUE_DEBUG
long __magic;
#endif
};
#if WAITQUEUE_DEBUG
# define __SEM_DEBUG_INIT(name) \
, (long)&(name).__magic
#else
# define __SEM_DEBUG_INIT(name)
#endif
#define __SEMAPHORE_INITIALIZER(name,count) \
{ ATOMIC_INIT(count), ATOMIC_INIT(0), __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
__SEM_DEBUG_INIT(name) }
#define __MUTEX_INITIALIZER(name) \
__SEMAPHORE_INITIALIZER(name,1)
#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
extern inline void sema_init (struct semaphore *sem, int val)
{
atomic_set(&sem->count, val);
atomic_set(&sem->waking, 0);
init_waitqueue_head(&sem->wait);
#if WAITQUEUE_DEBUG
sem->__magic = (long)&sem->__magic;
#endif
}
static inline void init_MUTEX (struct semaphore *sem)
{
sema_init(sem, 1);
}
static inline void init_MUTEX_LOCKED (struct semaphore *sem)
{
sema_init(sem, 0);
}
extern void __down(struct semaphore * sem);
extern int __down_interruptible(struct semaphore * sem);
extern int __down_trylock(struct semaphore * sem);
extern void __up(struct semaphore * sem);
extern inline void down(struct semaphore * sem)
{
register atomic_t *ptr asm("g1");
register int increment asm("g2");
#if WAITQUEUE_DEBUG
CHECK_MAGIC(sem->__magic);
#endif
ptr = (atomic_t *) __atomic_fool_gcc(sem);
increment = 1;
__asm__ __volatile__("
mov %%o7, %%g4
call ___atomic_sub
add %%o7, 8, %%o7
tst %%g2
bl 2f
nop
1:
.subsection 2
2: save %%sp, -64, %%sp
mov %%g1, %%l1
mov %%g5, %%l5
call %3
mov %%g1, %%o0
mov %%l1, %%g1
ba 1b
restore %%l5, %%g0, %%g5
.previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__down)
: "g3", "g4", "g7", "memory", "cc");
}
extern inline int down_interruptible(struct semaphore * sem)
{
register atomic_t *ptr asm("g1");
register int increment asm("g2");
#if WAITQUEUE_DEBUG
CHECK_MAGIC(sem->__magic);
#endif
ptr = (atomic_t *) __atomic_fool_gcc(sem);
increment = 1;
__asm__ __volatile__("
mov %%o7, %%g4
call ___atomic_sub
add %%o7, 8, %%o7
tst %%g2
bl 2f
clr %%g2
1:
.subsection 2
2: save %%sp, -64, %%sp
mov %%g1, %%l1
mov %%g5, %%l5
call %3
mov %%g1, %%o0
mov %%l1, %%g1
mov %%l5, %%g5
ba 1b
restore %%o0, %%g0, %%g2
.previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__down_interruptible)
: "g3", "g4", "g7", "memory", "cc");
return increment;
}
extern inline int down_trylock(struct semaphore * sem)
{
register atomic_t *ptr asm("g1");
register int increment asm("g2");
#if WAITQUEUE_DEBUG
CHECK_MAGIC(sem->__magic);
#endif
ptr = (atomic_t *) __atomic_fool_gcc(sem);
increment = 1;
__asm__ __volatile__("
mov %%o7, %%g4
call ___atomic_sub
add %%o7, 8, %%o7
tst %%g2
bl 2f
clr %%g2
1:
.subsection 2
2: save %%sp, -64, %%sp
mov %%g1, %%l1
mov %%g5, %%l5
call %3
mov %%g1, %%o0
mov %%l1, %%g1
mov %%l5, %%g5
ba 1b
restore %%o0, %%g0, %%g2
.previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__down_trylock)
: "g3", "g4", "g7", "memory", "cc");
return increment;
}
extern inline void up(struct semaphore * sem)
{
register atomic_t *ptr asm("g1");
register int increment asm("g2");
#if WAITQUEUE_DEBUG
CHECK_MAGIC(sem->__magic);
#endif
ptr = (atomic_t *) __atomic_fool_gcc(sem);
increment = 1;
__asm__ __volatile__("
mov %%o7, %%g4
call ___atomic_add
add %%o7, 8, %%o7
tst %%g2
ble 2f
nop
1:
.subsection 2
2: save %%sp, -64, %%sp
mov %%g1, %%l1
mov %%g5, %%l5
call %3
mov %%g1, %%o0
mov %%l1, %%g1
ba 1b
restore %%l5, %%g0, %%g5
.previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__up)
: "g3", "g4", "g7", "memory", "cc");
}
#endif /* __KERNEL__ */
#endif /* !(_SPARC_SEMAPHORE_H) */
|
