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- /*
- * linux/include/asm-arm/atomic.h
- *
- * Copyright (c) 1996 Russell King.
- *
- * Changelog:
- * 27-06-1996 RMK Created
- * 13-04-1997 RMK Made functions atomic!
- * 07-12-1997 RMK Upgraded for v2.1.
- * 26-08-1998 PJB Added #ifdef __KERNEL__
- */
- #ifndef __ASM_ARM_ATOMIC_H
- #define __ASM_ARM_ATOMIC_H
-
- #ifdef __SMP__
- #error SMP not supported
- #endif
-
- #include <linux/config.h>
-
- #ifdef CONFIG_ARCH_CO285
- typedef struct { volatile int counter; } atomic_t;
- #else
- typedef struct { int counter; } atomic_t;
- #endif
-
- #define ATOMIC_INIT(i) { (i) }
-
- #ifdef __KERNEL__
- #include <asm/system.h>
-
- #define atomic_read(v) ((v)->counter)
- #define atomic_set(v,i) (((v)->counter) = (i))
-
- static __inline__ void atomic_add(int i, volatile atomic_t *v)
- {
- unsigned long flags;
-
- save_flags_cli (flags);
- v->counter += i;
- restore_flags (flags);
- }
-
- static __inline__ void atomic_sub(int i, volatile atomic_t *v)
- {
- unsigned long flags;
-
- save_flags_cli (flags);
- v->counter -= i;
- restore_flags (flags);
- }
-
- static __inline__ void atomic_inc(volatile atomic_t *v)
- {
- unsigned long flags;
-
- save_flags_cli (flags);
- v->counter += 1;
- restore_flags (flags);
- }
-
- static __inline__ void atomic_dec(volatile atomic_t *v)
- {
- unsigned long flags;
-
- save_flags_cli (flags);
- v->counter -= 1;
- restore_flags (flags);
- }
-
- static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
- {
- unsigned long flags;
- int result;
-
- save_flags_cli (flags);
- v->counter -= 1;
- result = (v->counter == 0);
- restore_flags (flags);
-
- return result;
- }
-
- static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *addr)
- {
- unsigned long flags;
-
- save_flags_cli (flags);
- *addr &= ~mask;
- restore_flags (flags);
- }
-
- #endif
- #endif
-