461f456817
The arm, xtensa and mips version of atomic.h were already very similar (the mips one was a copy of xtensa). Combine these implementations together to produce a generic atomic.h that can be included by these architectures (and any others that need it in future). Signed-off-by: Chris Packham <judge.packham@gmail.com> Reviewed-by: Tom Rini <trini@konsulko.com>
151 lines
2.7 KiB
C
151 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef _ASM_GENERIC_ATOMIC_H
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#define _ASM_GENERIC_ATOMIC_H
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typedef struct { volatile int counter; } atomic_t;
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#if BITS_PER_LONG == 32
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typedef struct { volatile long long counter; } atomic64_t;
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#else /* BIT_PER_LONG == 32 */
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typedef struct { volatile long counter; } atomic64_t;
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#endif
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#define ATOMIC_INIT(i) { (i) }
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#define atomic_read(v) ((v)->counter)
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#define atomic_set(v, i) ((v)->counter = (i))
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#define atomic64_read(v) atomic_read(v)
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#define atomic64_set(v, i) atomic_set(v, i)
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static inline void atomic_add(int i, atomic_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += i;
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local_irq_restore(flags);
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}
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static inline void atomic_sub(int i, atomic_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= i;
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local_irq_restore(flags);
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}
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static inline void atomic_inc(atomic_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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++v->counter;
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local_irq_restore(flags);
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}
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static inline void atomic_dec(atomic_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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--v->counter;
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local_irq_restore(flags);
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}
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static inline int atomic_dec_and_test(volatile atomic_t *v)
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{
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unsigned long flags = 0;
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int val;
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local_irq_save(flags);
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val = v->counter;
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v->counter = val -= 1;
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local_irq_restore(flags);
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return val == 0;
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}
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static inline int atomic_add_negative(int i, volatile atomic_t *v)
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{
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unsigned long flags = 0;
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int val;
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local_irq_save(flags);
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val = v->counter;
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v->counter = val += i;
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local_irq_restore(flags);
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return val < 0;
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}
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static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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*addr &= ~mask;
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local_irq_restore(flags);
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}
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#if BITS_PER_LONG == 32
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static inline void atomic64_add(long long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += i;
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local_irq_restore(flags);
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}
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static inline void atomic64_sub(long long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= i;
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local_irq_restore(flags);
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}
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#else /* BIT_PER_LONG == 32 */
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static inline void atomic64_add(long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += i;
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local_irq_restore(flags);
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}
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static inline void atomic64_sub(long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= i;
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local_irq_restore(flags);
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}
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#endif
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static inline void atomic64_inc(volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += 1;
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local_irq_restore(flags);
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}
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static inline void atomic64_dec(volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= 1;
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local_irq_restore(flags);
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}
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#endif
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