1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
197 lines
4.0 KiB
C
197 lines
4.0 KiB
C
#ifndef _SPARC_SEMAPHORE_H
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#define _SPARC_SEMAPHORE_H
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/* Dinky, good for nothing, just barely irq safe, Sparc semaphores. */
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#ifdef __KERNEL__
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#include <asm/atomic.h>
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#include <linux/wait.h>
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#include <linux/rwsem.h>
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struct semaphore {
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atomic24_t count;
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int sleepers;
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wait_queue_head_t wait;
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};
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#define __SEMAPHORE_INITIALIZER(name, n) \
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{ \
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.count = ATOMIC24_INIT(n), \
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.sleepers = 0, \
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.wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
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}
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#define __MUTEX_INITIALIZER(name) \
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__SEMAPHORE_INITIALIZER(name,1)
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#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
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struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
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#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
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#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
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static inline void sema_init (struct semaphore *sem, int val)
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{
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atomic24_set(&sem->count, val);
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sem->sleepers = 0;
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init_waitqueue_head(&sem->wait);
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}
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static inline void init_MUTEX (struct semaphore *sem)
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{
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sema_init(sem, 1);
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}
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static inline void init_MUTEX_LOCKED (struct semaphore *sem)
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{
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sema_init(sem, 0);
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}
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extern void __down(struct semaphore * sem);
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extern int __down_interruptible(struct semaphore * sem);
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extern int __down_trylock(struct semaphore * sem);
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extern void __up(struct semaphore * sem);
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static inline void down(struct semaphore * sem)
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{
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register volatile int *ptr asm("g1");
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register int increment asm("g2");
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might_sleep();
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ptr = &(sem->count.counter);
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increment = 1;
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___atomic24_sub\n\t"
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" add %%o7, 8, %%o7\n\t"
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"tst %%g2\n\t"
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"bl 2f\n\t"
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" nop\n"
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"1:\n\t"
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".subsection 2\n"
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"2:\n\t"
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"save %%sp, -64, %%sp\n\t"
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"mov %%g1, %%l1\n\t"
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"mov %%g5, %%l5\n\t"
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"call %3\n\t"
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" mov %%g1, %%o0\n\t"
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"mov %%l1, %%g1\n\t"
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"ba 1b\n\t"
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" restore %%l5, %%g0, %%g5\n\t"
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".previous\n"
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: "=&r" (increment)
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: "0" (increment), "r" (ptr), "i" (__down)
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: "g3", "g4", "g7", "memory", "cc");
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}
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static inline int down_interruptible(struct semaphore * sem)
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{
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register volatile int *ptr asm("g1");
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register int increment asm("g2");
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might_sleep();
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ptr = &(sem->count.counter);
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increment = 1;
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___atomic24_sub\n\t"
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" add %%o7, 8, %%o7\n\t"
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"tst %%g2\n\t"
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"bl 2f\n\t"
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" clr %%g2\n"
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"1:\n\t"
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".subsection 2\n"
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"2:\n\t"
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"save %%sp, -64, %%sp\n\t"
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"mov %%g1, %%l1\n\t"
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"mov %%g5, %%l5\n\t"
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"call %3\n\t"
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" mov %%g1, %%o0\n\t"
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"mov %%l1, %%g1\n\t"
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"mov %%l5, %%g5\n\t"
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"ba 1b\n\t"
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" restore %%o0, %%g0, %%g2\n\t"
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".previous\n"
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: "=&r" (increment)
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: "0" (increment), "r" (ptr), "i" (__down_interruptible)
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: "g3", "g4", "g7", "memory", "cc");
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return increment;
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}
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static inline int down_trylock(struct semaphore * sem)
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{
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register volatile int *ptr asm("g1");
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register int increment asm("g2");
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ptr = &(sem->count.counter);
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increment = 1;
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___atomic24_sub\n\t"
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" add %%o7, 8, %%o7\n\t"
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"tst %%g2\n\t"
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"bl 2f\n\t"
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" clr %%g2\n"
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"1:\n\t"
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".subsection 2\n"
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"2:\n\t"
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"save %%sp, -64, %%sp\n\t"
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"mov %%g1, %%l1\n\t"
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"mov %%g5, %%l5\n\t"
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"call %3\n\t"
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" mov %%g1, %%o0\n\t"
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"mov %%l1, %%g1\n\t"
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"mov %%l5, %%g5\n\t"
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"ba 1b\n\t"
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" restore %%o0, %%g0, %%g2\n\t"
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".previous\n"
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: "=&r" (increment)
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: "0" (increment), "r" (ptr), "i" (__down_trylock)
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: "g3", "g4", "g7", "memory", "cc");
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return increment;
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}
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static inline void up(struct semaphore * sem)
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{
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register volatile int *ptr asm("g1");
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register int increment asm("g2");
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ptr = &(sem->count.counter);
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increment = 1;
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___atomic24_add\n\t"
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" add %%o7, 8, %%o7\n\t"
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"tst %%g2\n\t"
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"ble 2f\n\t"
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" nop\n"
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"1:\n\t"
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".subsection 2\n"
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"2:\n\t"
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"save %%sp, -64, %%sp\n\t"
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"mov %%g1, %%l1\n\t"
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"mov %%g5, %%l5\n\t"
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"call %3\n\t"
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" mov %%g1, %%o0\n\t"
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"mov %%l1, %%g1\n\t"
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"ba 1b\n\t"
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" restore %%l5, %%g0, %%g5\n\t"
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".previous\n"
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: "=&r" (increment)
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: "0" (increment), "r" (ptr), "i" (__up)
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: "g3", "g4", "g7", "memory", "cc");
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}
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#endif /* __KERNEL__ */
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#endif /* !(_SPARC_SEMAPHORE_H) */
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