#ifndef _H8300_SEMAPHORE_H #define _H8300_SEMAPHORE_H #define RW_LOCK_BIAS 0x01000000 #ifndef __ASSEMBLY__ #include <linux/linkage.h> #include <linux/wait.h> #include <linux/spinlock.h> #include <linux/rwsem.h> #include <asm/system.h> #include <asm/atomic.h> /* * Interrupt-safe semaphores.. * * (C) Copyright 1996 Linus Torvalds * * H8/300 version by Yoshinori Sato */ struct semaphore { atomic_t count; int sleepers; wait_queue_head_t wait; }; #define __SEMAPHORE_INITIALIZER(name, n) \ { \ .count = ATOMIC_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) #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0) static inline void sema_init (struct semaphore *sem, int val) { *sem = (struct semaphore)__SEMAPHORE_INITIALIZER(*sem, val); } 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); } asmlinkage void __down_failed(void /* special register calling convention */); asmlinkage int __down_failed_interruptible(void /* params in registers */); asmlinkage int __down_failed_trylock(void /* params in registers */); asmlinkage void __up_wakeup(void /* special register calling convention */); asmlinkage void __down(struct semaphore * sem); asmlinkage int __down_interruptible(struct semaphore * sem); asmlinkage int __down_trylock(struct semaphore * sem); asmlinkage void __up(struct semaphore * sem); extern spinlock_t semaphore_wake_lock; /* * This is ugly, but we want the default case to fall through. * "down_failed" is a special asm handler that calls the C * routine that actually waits. See arch/m68k/lib/semaphore.S */ static inline void down(struct semaphore * sem) { register atomic_t *count asm("er0"); might_sleep(); count = &(sem->count); __asm__ __volatile__( "stc ccr,r3l\n\t" "orc #0x80,ccr\n\t" "mov.l %2, er1\n\t" "dec.l #1,er1\n\t" "mov.l er1,%0\n\t" "bpl 1f\n\t" "ldc r3l,ccr\n\t" "mov.l %1,er0\n\t" "jsr @___down\n\t" "bra 2f\n" "1:\n\t" "ldc r3l,ccr\n" "2:" : "=m"(*count) : "g"(sem),"m"(*count) : "cc", "er1", "er2", "er3"); } static inline int down_interruptible(struct semaphore * sem) { register atomic_t *count asm("er0"); might_sleep(); count = &(sem->count); __asm__ __volatile__( "stc ccr,r1l\n\t" "orc #0x80,ccr\n\t" "mov.l %3, er2\n\t" "dec.l #1,er2\n\t" "mov.l er2,%1\n\t" "bpl 1f\n\t" "ldc r1l,ccr\n\t" "mov.l %2,er0\n\t" "jsr @___down_interruptible\n\t" "bra 2f\n" "1:\n\t" "ldc r1l,ccr\n\t" "sub.l %0,%0\n\t" "2:\n\t" : "=r" (count),"=m" (*count) : "g"(sem),"m"(*count) : "cc", "er1", "er2", "er3"); return (int)count; } static inline int down_trylock(struct semaphore * sem) { register atomic_t *count asm("er0"); count = &(sem->count); __asm__ __volatile__( "stc ccr,r3l\n\t" "orc #0x80,ccr\n\t" "mov.l %3,er2\n\t" "dec.l #1,er2\n\t" "mov.l er2,%0\n\t" "bpl 1f\n\t" "ldc r3l,ccr\n\t" "jmp @3f\n\t" LOCK_SECTION_START(".align 2\n\t") "3:\n\t" "mov.l %2,er0\n\t" "jsr @___down_trylock\n\t" "jmp @2f\n\t" LOCK_SECTION_END "1:\n\t" "ldc r3l,ccr\n\t" "sub.l %1,%1\n" "2:" : "=m" (*count),"=r"(count) : "g"(sem),"m"(*count) : "cc", "er1","er2", "er3"); return (int)count; } /* * Note! This is subtle. We jump to wake people up only if * the semaphore was negative (== somebody was waiting on it). * The default case (no contention) will result in NO * jumps for both down() and up(). */ static inline void up(struct semaphore * sem) { register atomic_t *count asm("er0"); count = &(sem->count); __asm__ __volatile__( "stc ccr,r3l\n\t" "orc #0x80,ccr\n\t" "mov.l %2,er1\n\t" "inc.l #1,er1\n\t" "mov.l er1,%0\n\t" "ldc r3l,ccr\n\t" "sub.l er2,er2\n\t" "cmp.l er2,er1\n\t" "bgt 1f\n\t" "mov.l %1,er0\n\t" "jsr @___up\n" "1:" : "=m"(*count) : "g"(sem),"m"(*count) : "cc", "er1", "er2", "er3"); } #endif /* __ASSEMBLY__ */ #endif