#ifndef _ASM_IA64_ATOMIC_H #define _ASM_IA64_ATOMIC_H /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. * * NOTE: don't mess with the types below! The "unsigned long" and * "int" types were carefully placed so as to ensure proper operation * of the macros. * * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co * David Mosberger-Tang <davidm@hpl.hp.com> */ #include <linux/types.h> #include <asm/intrinsics.h> /* * On IA-64, counter must always be volatile to ensure that that the * memory accesses are ordered. */ typedef struct { volatile __s32 counter; } atomic_t; typedef struct { volatile __s64 counter; } atomic64_t; #define ATOMIC_INIT(i) ((atomic_t) { (i) }) #define ATOMIC64_INIT(i) ((atomic64_t) { (i) }) #define atomic_read(v) ((v)->counter) #define atomic64_read(v) ((v)->counter) #define atomic_set(v,i) (((v)->counter) = (i)) #define atomic64_set(v,i) (((v)->counter) = (i)) static __inline__ int ia64_atomic_add (int i, atomic_t *v) { __s32 old, new; CMPXCHG_BUGCHECK_DECL do { CMPXCHG_BUGCHECK(v); old = atomic_read(v); new = old + i; } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); return new; } static __inline__ int ia64_atomic64_add (__s64 i, atomic64_t *v) { __s64 old, new; CMPXCHG_BUGCHECK_DECL do { CMPXCHG_BUGCHECK(v); old = atomic_read(v); new = old + i; } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); return new; } static __inline__ int ia64_atomic_sub (int i, atomic_t *v) { __s32 old, new; CMPXCHG_BUGCHECK_DECL do { CMPXCHG_BUGCHECK(v); old = atomic_read(v); new = old - i; } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); return new; } static __inline__ int ia64_atomic64_sub (__s64 i, atomic64_t *v) { __s64 old, new; CMPXCHG_BUGCHECK_DECL do { CMPXCHG_BUGCHECK(v); old = atomic_read(v); new = old - i; } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); return new; } #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) #define atomic_add_unless(v, a, u) \ ({ \ int c, old; \ c = atomic_read(v); \ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ c = old; \ c != (u); \ }) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) #define atomic_add_return(i,v) \ ({ \ int __ia64_aar_i = (i); \ (__builtin_constant_p(i) \ && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ : ia64_atomic_add(__ia64_aar_i, v); \ }) #define atomic64_add_return(i,v) \ ({ \ long __ia64_aar_i = (i); \ (__builtin_constant_p(i) \ && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ : ia64_atomic64_add(__ia64_aar_i, v); \ }) /* * Atomically add I to V and return TRUE if the resulting value is * negative. */ static __inline__ int atomic_add_negative (int i, atomic_t *v) { return atomic_add_return(i, v) < 0; } static __inline__ int atomic64_add_negative (__s64 i, atomic64_t *v) { return atomic64_add_return(i, v) < 0; } #define atomic_sub_return(i,v) \ ({ \ int __ia64_asr_i = (i); \ (__builtin_constant_p(i) \ && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ : ia64_atomic_sub(__ia64_asr_i, v); \ }) #define atomic64_sub_return(i,v) \ ({ \ long __ia64_asr_i = (i); \ (__builtin_constant_p(i) \ && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ : ia64_atomic64_sub(__ia64_asr_i, v); \ }) #define atomic_dec_return(v) atomic_sub_return(1, (v)) #define atomic_inc_return(v) atomic_add_return(1, (v)) #define atomic64_dec_return(v) atomic64_sub_return(1, (v)) #define atomic64_inc_return(v) atomic64_add_return(1, (v)) #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) #define atomic_add(i,v) atomic_add_return((i), (v)) #define atomic_sub(i,v) atomic_sub_return((i), (v)) #define atomic_inc(v) atomic_add(1, (v)) #define atomic_dec(v) atomic_sub(1, (v)) #define atomic64_add(i,v) atomic64_add_return((i), (v)) #define atomic64_sub(i,v) atomic64_sub_return((i), (v)) #define atomic64_inc(v) atomic64_add(1, (v)) #define atomic64_dec(v) atomic64_sub(1, (v)) /* Atomic operations are already serializing */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() #include <asm-generic/atomic.h> #endif /* _ASM_IA64_ATOMIC_H */