#ifndef __ARCH_S390_ATOMIC__ #define __ARCH_S390_ATOMIC__ /* * include/asm-s390/atomic.h * * S390 version * Copyright (C) 1999-2005 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Denis Joseph Barrow, * Arnd Bergmann (arndb@de.ibm.com) * * Derived from "include/asm-i386/bitops.h" * Copyright (C) 1992, Linus Torvalds * */ /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. * S390 uses 'Compare And Swap' for atomicity in SMP enviroment */ typedef struct { volatile int counter; } __attribute__ ((aligned (4))) atomic_t; #define ATOMIC_INIT(i) { (i) } #ifdef __KERNEL__ #define __CS_LOOP(ptr, op_val, op_string) ({ \ typeof(ptr->counter) old_val, new_val; \ __asm__ __volatile__(" l %0,0(%3)\n" \ "0: lr %1,%0\n" \ op_string " %1,%4\n" \ " cs %0,%1,0(%3)\n" \ " jl 0b" \ : "=&d" (old_val), "=&d" (new_val), \ "=m" (((atomic_t *)(ptr))->counter) \ : "a" (ptr), "d" (op_val), \ "m" (((atomic_t *)(ptr))->counter) \ : "cc", "memory" ); \ new_val; \ }) #define atomic_read(v) ((v)->counter) #define atomic_set(v,i) (((v)->counter) = (i)) static __inline__ int atomic_add_return(int i, atomic_t * v) { return __CS_LOOP(v, i, "ar"); } #define atomic_add(_i, _v) atomic_add_return(_i, _v) #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0) #define atomic_inc(_v) atomic_add_return(1, _v) #define atomic_inc_return(_v) atomic_add_return(1, _v) #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0) static __inline__ int atomic_sub_return(int i, atomic_t * v) { return __CS_LOOP(v, i, "sr"); } #define atomic_sub(_i, _v) atomic_sub_return(_i, _v) #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0) #define atomic_dec(_v) atomic_sub_return(1, _v) #define atomic_dec_return(_v) atomic_sub_return(1, _v) #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0) static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t * v) { __CS_LOOP(v, ~mask, "nr"); } static __inline__ void atomic_set_mask(unsigned long mask, atomic_t * v) { __CS_LOOP(v, mask, "or"); } #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) static __inline__ int atomic_cmpxchg(atomic_t *v, int old, int new) { __asm__ __volatile__(" cs %0,%3,0(%2)\n" : "+d" (old), "=m" (v->counter) : "a" (v), "d" (new), "m" (v->counter) : "cc", "memory" ); return old; } static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) { int c, old; c = atomic_read(v); while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c) c = old; return c != u; } #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) #undef __CS_LOOP #ifdef __s390x__ typedef struct { volatile long long counter; } __attribute__ ((aligned (8))) atomic64_t; #define ATOMIC64_INIT(i) { (i) } #define __CSG_LOOP(ptr, op_val, op_string) ({ \ typeof(ptr->counter) old_val, new_val; \ __asm__ __volatile__(" lg %0,0(%3)\n" \ "0: lgr %1,%0\n" \ op_string " %1,%4\n" \ " csg %0,%1,0(%3)\n" \ " jl 0b" \ : "=&d" (old_val), "=&d" (new_val), \ "=m" (((atomic_t *)(ptr))->counter) \ : "a" (ptr), "d" (op_val), \ "m" (((atomic_t *)(ptr))->counter) \ : "cc", "memory" ); \ new_val; \ }) #define atomic64_read(v) ((v)->counter) #define atomic64_set(v,i) (((v)->counter) = (i)) static __inline__ long long atomic64_add_return(long long i, atomic64_t * v) { return __CSG_LOOP(v, i, "agr"); } #define atomic64_add(_i, _v) atomic64_add_return(_i, _v) #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0) #define atomic64_inc(_v) atomic64_add_return(1, _v) #define atomic64_inc_return(_v) atomic64_add_return(1, _v) #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0) static __inline__ long long atomic64_sub_return(long long i, atomic64_t * v) { return __CSG_LOOP(v, i, "sgr"); } #define atomic64_sub(_i, _v) atomic64_sub_return(_i, _v) #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0) #define atomic64_dec(_v) atomic64_sub_return(1, _v) #define atomic64_dec_return(_v) atomic64_sub_return(1, _v) #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0) static __inline__ void atomic64_clear_mask(unsigned long mask, atomic64_t * v) { __CSG_LOOP(v, ~mask, "ngr"); } static __inline__ void atomic64_set_mask(unsigned long mask, atomic64_t * v) { __CSG_LOOP(v, mask, "ogr"); } static __inline__ long long atomic64_cmpxchg(atomic64_t *v, long long old, long long new) { __asm__ __volatile__(" csg %0,%3,0(%2)\n" : "+d" (old), "=m" (v->counter) : "a" (v), "d" (new), "m" (v->counter) : "cc", "memory" ); return old; } static __inline__ int atomic64_add_unless(atomic64_t *v, long long a, long long u) { long long c, old; c = atomic64_read(v); while (c != u && (old = atomic64_cmpxchg(v, c, c + a)) != c) c = old; return c != u; } #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) #undef __CSG_LOOP #endif #define smp_mb__before_atomic_dec() smp_mb() #define smp_mb__after_atomic_dec() smp_mb() #define smp_mb__before_atomic_inc() smp_mb() #define smp_mb__after_atomic_inc() smp_mb() #include <asm-generic/atomic.h> #endif /* __KERNEL__ */ #endif /* __ARCH_S390_ATOMIC__ */