diff options
Diffstat (limited to 'include/asm-alpha/spinlock.h')
| -rw-r--r-- | include/asm-alpha/spinlock.h | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/include/asm-alpha/spinlock.h b/include/asm-alpha/spinlock.h deleted file mode 100644 index 80780dba998..00000000000 --- a/include/asm-alpha/spinlock.h +++ /dev/null @@ -1,212 +0,0 @@ -#ifndef _ALPHA_SPINLOCK_H -#define _ALPHA_SPINLOCK_H - -#include <linux/config.h> -#include <asm/system.h> -#include <linux/kernel.h> -#include <asm/current.h> - - -/* - * Simple spin lock operations. There are two variants, one clears IRQ's - * on the local processor, one does not. - * - * We make no fairness assumptions. They have a cost. - */ - -typedef struct { - volatile unsigned int lock; -#ifdef CONFIG_DEBUG_SPINLOCK - int on_cpu; - int line_no; - void *previous; - struct task_struct * task; - const char *base_file; -#endif -} spinlock_t; - -#ifdef CONFIG_DEBUG_SPINLOCK -#define SPIN_LOCK_UNLOCKED (spinlock_t){ 0, -1, 0, NULL, NULL, NULL } -#else -#define SPIN_LOCK_UNLOCKED (spinlock_t){ 0 } -#endif - -#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0) -#define spin_is_locked(x) ((x)->lock != 0) -#define spin_unlock_wait(x) do { barrier(); } while ((x)->lock) - -#ifdef CONFIG_DEBUG_SPINLOCK -extern void _raw_spin_unlock(spinlock_t * lock); -extern void debug_spin_lock(spinlock_t * lock, const char *, int); -extern int debug_spin_trylock(spinlock_t * lock, const char *, int); -#define _raw_spin_lock(LOCK) \ - debug_spin_lock(LOCK, __BASE_FILE__, __LINE__) -#define _raw_spin_trylock(LOCK) \ - debug_spin_trylock(LOCK, __BASE_FILE__, __LINE__) -#else -static inline void _raw_spin_unlock(spinlock_t * lock) -{ - mb(); - lock->lock = 0; -} - -static inline void _raw_spin_lock(spinlock_t * lock) -{ - long tmp; - - __asm__ __volatile__( - "1: ldl_l %0,%1\n" - " bne %0,2f\n" - " lda %0,1\n" - " stl_c %0,%1\n" - " beq %0,2f\n" - " mb\n" - ".subsection 2\n" - "2: ldl %0,%1\n" - " bne %0,2b\n" - " br 1b\n" - ".previous" - : "=&r" (tmp), "=m" (lock->lock) - : "m"(lock->lock) : "memory"); -} - -static inline int _raw_spin_trylock(spinlock_t *lock) -{ - return !test_and_set_bit(0, &lock->lock); -} -#endif /* CONFIG_DEBUG_SPINLOCK */ - -#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) - -/***********************************************************/ - -typedef struct { - volatile unsigned int lock; -} rwlock_t; - -#define RW_LOCK_UNLOCKED (rwlock_t){ 0 } - -#define rwlock_init(x) do { *(x) = RW_LOCK_UNLOCKED; } while(0) - -static inline int read_can_lock(rwlock_t *lock) -{ - return (lock->lock & 1) == 0; -} - -static inline int write_can_lock(rwlock_t *lock) -{ - return lock->lock == 0; -} - -#ifdef CONFIG_DEBUG_RWLOCK -extern void _raw_write_lock(rwlock_t * lock); -extern void _raw_read_lock(rwlock_t * lock); -#else -static inline void _raw_write_lock(rwlock_t * lock) -{ - long regx; - - __asm__ __volatile__( - "1: ldl_l %1,%0\n" - " bne %1,6f\n" - " lda %1,1\n" - " stl_c %1,%0\n" - " beq %1,6f\n" - " mb\n" - ".subsection 2\n" - "6: ldl %1,%0\n" - " bne %1,6b\n" - " br 1b\n" - ".previous" - : "=m" (*lock), "=&r" (regx) - : "m" (*lock) : "memory"); -} - -static inline void _raw_read_lock(rwlock_t * lock) -{ - long regx; - - __asm__ __volatile__( - "1: ldl_l %1,%0\n" - " blbs %1,6f\n" - " subl %1,2,%1\n" - " stl_c %1,%0\n" - " beq %1,6f\n" - " mb\n" - ".subsection 2\n" - "6: ldl %1,%0\n" - " blbs %1,6b\n" - " br 1b\n" - ".previous" - : "=m" (*lock), "=&r" (regx) - : "m" (*lock) : "memory"); -} -#endif /* CONFIG_DEBUG_RWLOCK */ - -static inline int _raw_read_trylock(rwlock_t * lock) -{ - long regx; - int success; - - __asm__ __volatile__( - "1: ldl_l %1,%0\n" - " lda %2,0\n" - " blbs %1,2f\n" - " subl %1,2,%2\n" - " stl_c %2,%0\n" - " beq %2,6f\n" - "2: mb\n" - ".subsection 2\n" - "6: br 1b\n" - ".previous" - : "=m" (*lock), "=&r" (regx), "=&r" (success) - : "m" (*lock) : "memory"); - - return success; -} - -static inline int _raw_write_trylock(rwlock_t * lock) -{ - long regx; - int success; - - __asm__ __volatile__( - "1: ldl_l %1,%0\n" - " lda %2,0\n" - " bne %1,2f\n" - " lda %2,1\n" - " stl_c %2,%0\n" - " beq %2,6f\n" - "2: mb\n" - ".subsection 2\n" - "6: br 1b\n" - ".previous" - : "=m" (*lock), "=&r" (regx), "=&r" (success) - : "m" (*lock) : "memory"); - - return success; -} - -static inline void _raw_write_unlock(rwlock_t * lock) -{ - mb(); - lock->lock = 0; -} - -static inline void _raw_read_unlock(rwlock_t * lock) -{ - long regx; - __asm__ __volatile__( - " mb\n" - "1: ldl_l %1,%0\n" - " addl %1,2,%1\n" - " stl_c %1,%0\n" - " beq %1,6f\n" - ".subsection 2\n" - "6: br 1b\n" - ".previous" - : "=m" (*lock), "=&r" (regx) - : "m" (*lock) : "memory"); -} - -#endif /* _ALPHA_SPINLOCK_H */ |