11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef _ASM_IA64_ATOMIC_H 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define _ASM_IA64_ATOMIC_H 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Atomic operations that C can't guarantee us. Useful for 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * resource counting etc.. 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOTE: don't mess with the types below! The "unsigned long" and 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * "int" types were carefully placed so as to ensure proper operation 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * of the macros. 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * David Mosberger-Tang <davidm@hpl.hp.com> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/intrinsics.h> 180cd64efb61f1e68be26bd5121ccff3c779dc488bPeter Zijlstra#include <asm/barrier.h> 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 21a119365586b0130dfea06457f584953e0ff6481dTony Luck#define ATOMIC_INIT(i) { (i) } 22a119365586b0130dfea06457f584953e0ff6481dTony Luck#define ATOMIC64_INIT(i) { (i) } 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 242291059c852706c6f5ffb400366042b7625066cdPranith Kumar#define atomic_read(v) ACCESS_ONCE((v)->counter) 252291059c852706c6f5ffb400366042b7625066cdPranith Kumar#define atomic64_read(v) ACCESS_ONCE((v)->counter) 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_set(v,i) (((v)->counter) = (i)) 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_set(v,i) (((v)->counter) = (i)) 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define ATOMIC_OP(op, c_op) \ 3108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstrastatic __inline__ int \ 3208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstraia64_atomic_##op (int i, atomic_t *v) \ 3308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra{ \ 3408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra __s32 old, new; \ 3508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra CMPXCHG_BUGCHECK_DECL \ 3608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra \ 3708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra do { \ 3808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra CMPXCHG_BUGCHECK(v); \ 3908be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra old = atomic_read(v); \ 4008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra new = old c_op i; \ 4108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); \ 4208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra return new; \ 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4508be2dab191431f23f5f98ba2db76513d0d853e7Peter ZijlstraATOMIC_OP(add, +) 4608be2dab191431f23f5f98ba2db76513d0d853e7Peter ZijlstraATOMIC_OP(sub, -) 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#undef ATOMIC_OP 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic_add_return(i,v) \ 5108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra({ \ 5208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra int __ia64_aar_i = (i); \ 5308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra (__builtin_constant_p(i) \ 5408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ 5508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ 5608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ 5708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ 5808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ 5908be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra : ia64_atomic_add(__ia64_aar_i, v); \ 6008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra}) 6108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra 6208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic_sub_return(i,v) \ 6308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra({ \ 6408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra int __ia64_asr_i = (i); \ 6508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra (__builtin_constant_p(i) \ 6608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ 6708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ 6808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ 6908be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ 7008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ 7108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra : ia64_atomic_sub(__ia64_asr_i, v); \ 7208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra}) 7308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra 7408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define ATOMIC64_OP(op, c_op) \ 7508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstrastatic __inline__ long \ 7608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstraia64_atomic64_##op (__s64 i, atomic64_t *v) \ 7708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra{ \ 7808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra __s64 old, new; \ 7908be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra CMPXCHG_BUGCHECK_DECL \ 8008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra \ 8108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra do { \ 8208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra CMPXCHG_BUGCHECK(v); \ 8308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra old = atomic64_read(v); \ 8408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra new = old c_op i; \ 8508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); \ 8608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra return new; \ 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8908be2dab191431f23f5f98ba2db76513d0d853e7Peter ZijlstraATOMIC64_OP(add, +) 9008be2dab191431f23f5f98ba2db76513d0d853e7Peter ZijlstraATOMIC64_OP(sub, -) 9108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra 9208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#undef ATOMIC64_OP 9308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra 9408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic64_add_return(i,v) \ 9508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra({ \ 9608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra long __ia64_aar_i = (i); \ 9708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra (__builtin_constant_p(i) \ 9808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ 9908be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ 10008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ 10108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ 10208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ 10308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra : ia64_atomic64_add(__ia64_aar_i, v); \ 10408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra}) 10508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra 10608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic64_sub_return(i,v) \ 10708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra({ \ 10808be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra long __ia64_asr_i = (i); \ 10908be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra (__builtin_constant_p(i) \ 11008be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ 11108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ 11208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ 11308be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ 11408be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ 11508be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra : ia64_atomic64_sub(__ia64_asr_i, v); \ 11608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra}) 11708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra 118819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) 119ffbf670f5cd50501a34a5187981460da2216071eIngo Molnar#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 1204a6dae6d382e9edf3ff440b819e554ed706359bcNick Piggin 121819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers#define atomic64_cmpxchg(v, old, new) \ 122819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers (cmpxchg(&((v)->counter), old, new)) 123819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) 124819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers 125f24219b4e90cf70ec4a211b17fbabc725a0ddf3cArun Sharmastatic __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) 1262856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers{ 1272856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers int c, old; 1282856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers c = atomic_read(v); 1292856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers for (;;) { 1302856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers if (unlikely(c == (u))) 1312856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers break; 1322856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers old = atomic_cmpxchg((v), c, c + (a)); 1332856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers if (likely(old == c)) 1342856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers break; 1352856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers c = old; 1362856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers } 137f24219b4e90cf70ec4a211b17fbabc725a0ddf3cArun Sharma return c; 1382856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers} 1392856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers 1408426e1f6af0fd7f44d040af7263750c5a52f3cc3Nick Piggin 14101d69a82e1d3c938da16bf55aab000672243aa24Tony Luckstatic __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u) 1422856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers{ 1432856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers long c, old; 1442856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers c = atomic64_read(v); 1452856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers for (;;) { 1462856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers if (unlikely(c == (u))) 1472856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers break; 1482856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers old = atomic64_cmpxchg((v), c, c + (a)); 1492856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers if (likely(old == c)) 1502856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers break; 1512856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers c = old; 1522856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers } 1532856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers return c != (u); 1542856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers} 1552856f5e31c1413bf6e4f1371e07e17078a5fee5eMathieu Desnoyers 156819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 157819791319becde19e32788a34cc2556aef9f9e6dMathieu Desnoyers 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Atomically add I to V and return TRUE if the resulting value is 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * negative. 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic __inline__ int 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsatomic_add_negative (int i, atomic_t *v) 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return atomic_add_return(i, v) < 0; 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 16801d69a82e1d3c938da16bf55aab000672243aa24Tony Luckstatic __inline__ long 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsatomic64_add_negative (__s64 i, atomic64_t *v) 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return atomic64_add_return(i, v) < 0; 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_dec_return(v) atomic_sub_return(1, (v)) 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_inc_return(v) atomic_add_return(1, (v)) 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_dec_return(v) atomic64_sub_return(1, (v)) 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_inc_return(v) atomic64_add_return(1, (v)) 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 18608be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic_add(i,v) (void)atomic_add_return((i), (v)) 18708be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic_sub(i,v) (void)atomic_sub_return((i), (v)) 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_inc(v) atomic_add(1, (v)) 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_dec(v) atomic_sub(1, (v)) 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 19108be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic64_add(i,v) (void)atomic64_add_return((i), (v)) 19208be2dab191431f23f5f98ba2db76513d0d853e7Peter Zijlstra#define atomic64_sub(i,v) (void)atomic64_sub_return((i), (v)) 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_inc(v) atomic64_add(1, (v)) 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic64_dec(v) atomic64_sub(1, (v)) 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* _ASM_IA64_ATOMIC_H */ 197