1#ifndef __ARCH_H8300_ATOMIC__ 2#define __ARCH_H8300_ATOMIC__ 3 4#include <linux/types.h> 5#include <asm/cmpxchg.h> 6 7/* 8 * Atomic operations that C can't guarantee us. Useful for 9 * resource counting etc.. 10 */ 11 12#define ATOMIC_INIT(i) { (i) } 13 14#define atomic_read(v) READ_ONCE((v)->counter) 15#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) 16 17#include <linux/kernel.h> 18 19#define ATOMIC_OP_RETURN(op, c_op) \ 20static inline int atomic_##op##_return(int i, atomic_t *v) \ 21{ \ 22 h8300flags flags; \ 23 int ret; \ 24 \ 25 flags = arch_local_irq_save(); \ 26 ret = v->counter c_op i; \ 27 arch_local_irq_restore(flags); \ 28 return ret; \ 29} 30 31#define ATOMIC_OP(op, c_op) \ 32static inline void atomic_##op(int i, atomic_t *v) \ 33{ \ 34 h8300flags flags; \ 35 \ 36 flags = arch_local_irq_save(); \ 37 v->counter c_op i; \ 38 arch_local_irq_restore(flags); \ 39} 40 41ATOMIC_OP_RETURN(add, +=) 42ATOMIC_OP_RETURN(sub, -=) 43 44ATOMIC_OP(and, &=) 45ATOMIC_OP(or, |=) 46ATOMIC_OP(xor, ^=) 47 48#undef ATOMIC_OP_RETURN 49#undef ATOMIC_OP 50 51#define atomic_add(i, v) (void)atomic_add_return(i, v) 52#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) 53 54#define atomic_sub(i, v) (void)atomic_sub_return(i, v) 55#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) 56 57#define atomic_inc_return(v) atomic_add_return(1, v) 58#define atomic_dec_return(v) atomic_sub_return(1, v) 59 60#define atomic_inc(v) (void)atomic_inc_return(v) 61#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 62 63#define atomic_dec(v) (void)atomic_dec_return(v) 64#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) 65 66static inline int atomic_cmpxchg(atomic_t *v, int old, int new) 67{ 68 int ret; 69 h8300flags flags; 70 71 flags = arch_local_irq_save(); 72 ret = v->counter; 73 if (likely(ret == old)) 74 v->counter = new; 75 arch_local_irq_restore(flags); 76 return ret; 77} 78 79static inline int __atomic_add_unless(atomic_t *v, int a, int u) 80{ 81 int ret; 82 h8300flags flags; 83 84 flags = arch_local_irq_save(); 85 ret = v->counter; 86 if (ret != u) 87 v->counter += a; 88 arch_local_irq_restore(flags); 89 return ret; 90} 91 92#endif /* __ARCH_H8300_ATOMIC __ */ 93