linux/include/asm-sparc/semaphore.h
Christoph Hellwig 04fc8bbcf5 kill DECLARE_MUTEX_LOCKED
DECLARE_MUTEX_LOCKED was used for semaphores used as completions and we've
got rid of them.  Well, except for one in libusual that the maintainer
explicitly wants to keep as semaphore.  So convert that useage to an
explicit sema_init and kill of DECLARE_MUTEX_LOCKED so that new code is
reminded to use a completion.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: "Satyam Sharma" <satyam.sharma@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17 08:42:47 -07:00

193 lines
3.9 KiB
C

#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>
#include <linux/rwsem.h>
struct semaphore {
atomic24_t count;
int sleepers;
wait_queue_head_t wait;
};
#define __SEMAPHORE_INITIALIZER(name, n) \
{ \
.count = ATOMIC24_INIT(n), \
.sleepers = 0, \
.wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
}
#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
static inline void sema_init (struct semaphore *sem, int val)
{
atomic24_set(&sem->count, val);
sem->sleepers = 0;
init_waitqueue_head(&sem->wait);
}
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);
static inline void down(struct semaphore * sem)
{
register volatile int *ptr asm("g1");
register int increment asm("g2");
might_sleep();
ptr = &(sem->count.counter);
increment = 1;
__asm__ __volatile__(
"mov %%o7, %%g4\n\t"
"call ___atomic24_sub\n\t"
" add %%o7, 8, %%o7\n\t"
"tst %%g2\n\t"
"bl 2f\n\t"
" nop\n"
"1:\n\t"
".subsection 2\n"
"2:\n\t"
"save %%sp, -64, %%sp\n\t"
"mov %%g1, %%l1\n\t"
"mov %%g5, %%l5\n\t"
"call %3\n\t"
" mov %%g1, %%o0\n\t"
"mov %%l1, %%g1\n\t"
"ba 1b\n\t"
" restore %%l5, %%g0, %%g5\n\t"
".previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__down)
: "g3", "g4", "g7", "memory", "cc");
}
static inline int down_interruptible(struct semaphore * sem)
{
register volatile int *ptr asm("g1");
register int increment asm("g2");
might_sleep();
ptr = &(sem->count.counter);
increment = 1;
__asm__ __volatile__(
"mov %%o7, %%g4\n\t"
"call ___atomic24_sub\n\t"
" add %%o7, 8, %%o7\n\t"
"tst %%g2\n\t"
"bl 2f\n\t"
" clr %%g2\n"
"1:\n\t"
".subsection 2\n"
"2:\n\t"
"save %%sp, -64, %%sp\n\t"
"mov %%g1, %%l1\n\t"
"mov %%g5, %%l5\n\t"
"call %3\n\t"
" mov %%g1, %%o0\n\t"
"mov %%l1, %%g1\n\t"
"mov %%l5, %%g5\n\t"
"ba 1b\n\t"
" restore %%o0, %%g0, %%g2\n\t"
".previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__down_interruptible)
: "g3", "g4", "g7", "memory", "cc");
return increment;
}
static inline int down_trylock(struct semaphore * sem)
{
register volatile int *ptr asm("g1");
register int increment asm("g2");
ptr = &(sem->count.counter);
increment = 1;
__asm__ __volatile__(
"mov %%o7, %%g4\n\t"
"call ___atomic24_sub\n\t"
" add %%o7, 8, %%o7\n\t"
"tst %%g2\n\t"
"bl 2f\n\t"
" clr %%g2\n"
"1:\n\t"
".subsection 2\n"
"2:\n\t"
"save %%sp, -64, %%sp\n\t"
"mov %%g1, %%l1\n\t"
"mov %%g5, %%l5\n\t"
"call %3\n\t"
" mov %%g1, %%o0\n\t"
"mov %%l1, %%g1\n\t"
"mov %%l5, %%g5\n\t"
"ba 1b\n\t"
" restore %%o0, %%g0, %%g2\n\t"
".previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__down_trylock)
: "g3", "g4", "g7", "memory", "cc");
return increment;
}
static inline void up(struct semaphore * sem)
{
register volatile int *ptr asm("g1");
register int increment asm("g2");
ptr = &(sem->count.counter);
increment = 1;
__asm__ __volatile__(
"mov %%o7, %%g4\n\t"
"call ___atomic24_add\n\t"
" add %%o7, 8, %%o7\n\t"
"tst %%g2\n\t"
"ble 2f\n\t"
" nop\n"
"1:\n\t"
".subsection 2\n"
"2:\n\t"
"save %%sp, -64, %%sp\n\t"
"mov %%g1, %%l1\n\t"
"mov %%g5, %%l5\n\t"
"call %3\n\t"
" mov %%g1, %%o0\n\t"
"mov %%l1, %%g1\n\t"
"ba 1b\n\t"
" restore %%l5, %%g0, %%g5\n\t"
".previous\n"
: "=&r" (increment)
: "0" (increment), "r" (ptr), "i" (__up)
: "g3", "g4", "g7", "memory", "cc");
}
#endif /* __KERNEL__ */
#endif /* !(_SPARC_SEMAPHORE_H) */