From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 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! --- include/asm-ia64/atomic.h | 183 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 183 insertions(+) create mode 100644 include/asm-ia64/atomic.h (limited to 'include/asm-ia64/atomic.h') diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h new file mode 100644 index 00000000000..874a6f890e7 --- /dev/null +++ b/include/asm-ia64/atomic.h @@ -0,0 +1,183 @@ +#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 + */ +#include + +#include + +/* + * 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_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() + +#endif /* _ASM_IA64_ATOMIC_H */ -- cgit v1.2.3