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97 lines
2.1 KiB
97 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ARCH_H8300_ATOMIC__ |
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#define __ARCH_H8300_ATOMIC__ |
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#include <linux/compiler.h> |
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#include <linux/types.h> |
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#include <asm/cmpxchg.h> |
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#include <asm/irqflags.h> |
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/* |
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* Atomic operations that C can't guarantee us. Useful for |
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* resource counting etc.. |
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*/ |
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#define atomic_read(v) READ_ONCE((v)->counter) |
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#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) |
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#define ATOMIC_OP_RETURN(op, c_op) \ |
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static inline int atomic_##op##_return(int i, atomic_t *v) \ |
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{ \ |
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h8300flags flags; \ |
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int ret; \ |
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\ |
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flags = arch_local_irq_save(); \ |
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ret = v->counter c_op i; \ |
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arch_local_irq_restore(flags); \ |
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return ret; \ |
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} |
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#define ATOMIC_FETCH_OP(op, c_op) \ |
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static inline int atomic_fetch_##op(int i, atomic_t *v) \ |
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{ \ |
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h8300flags flags; \ |
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int ret; \ |
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\ |
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flags = arch_local_irq_save(); \ |
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ret = v->counter; \ |
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v->counter c_op i; \ |
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arch_local_irq_restore(flags); \ |
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return ret; \ |
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} |
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#define ATOMIC_OP(op, c_op) \ |
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static inline void atomic_##op(int i, atomic_t *v) \ |
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{ \ |
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h8300flags flags; \ |
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\ |
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flags = arch_local_irq_save(); \ |
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v->counter c_op i; \ |
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arch_local_irq_restore(flags); \ |
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} |
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ATOMIC_OP_RETURN(add, +=) |
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ATOMIC_OP_RETURN(sub, -=) |
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#define ATOMIC_OPS(op, c_op) \ |
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ATOMIC_OP(op, c_op) \ |
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ATOMIC_FETCH_OP(op, c_op) |
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ATOMIC_OPS(and, &=) |
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ATOMIC_OPS(or, |=) |
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ATOMIC_OPS(xor, ^=) |
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ATOMIC_OPS(add, +=) |
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ATOMIC_OPS(sub, -=) |
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#undef ATOMIC_OPS |
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#undef ATOMIC_OP_RETURN |
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#undef ATOMIC_OP |
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
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{ |
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int ret; |
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h8300flags flags; |
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flags = arch_local_irq_save(); |
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ret = v->counter; |
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if (likely(ret == old)) |
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v->counter = new; |
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arch_local_irq_restore(flags); |
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return ret; |
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} |
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static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u) |
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{ |
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int ret; |
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h8300flags flags; |
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flags = arch_local_irq_save(); |
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ret = v->counter; |
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if (ret != u) |
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v->counter += a; |
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arch_local_irq_restore(flags); |
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return ret; |
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} |
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#define atomic_fetch_add_unless atomic_fetch_add_unless |
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#endif /* __ARCH_H8300_ATOMIC __ */
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