mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
e6942b7de2
Implement atomic logic ops -- atomic_{or,xor,and}.
These will replace the atomic_{set,clear}_mask functions that are
available on some archs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*
|
|
* Generic implementation of 64-bit atomics using spinlocks,
|
|
* useful on processors that don't have 64-bit atomic instructions.
|
|
*
|
|
* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_GENERIC_ATOMIC64_H
|
|
#define _ASM_GENERIC_ATOMIC64_H
|
|
|
|
typedef struct {
|
|
long long counter;
|
|
} atomic64_t;
|
|
|
|
#define ATOMIC64_INIT(i) { (i) }
|
|
|
|
extern long long atomic64_read(const atomic64_t *v);
|
|
extern void atomic64_set(atomic64_t *v, long long i);
|
|
|
|
#define ATOMIC64_OP(op) \
|
|
extern void atomic64_##op(long long a, atomic64_t *v);
|
|
|
|
#define ATOMIC64_OP_RETURN(op) \
|
|
extern long long atomic64_##op##_return(long long a, atomic64_t *v);
|
|
|
|
#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op)
|
|
|
|
ATOMIC64_OPS(add)
|
|
ATOMIC64_OPS(sub)
|
|
|
|
ATOMIC64_OP(and)
|
|
ATOMIC64_OP(or)
|
|
ATOMIC64_OP(xor)
|
|
|
|
#undef ATOMIC64_OPS
|
|
#undef ATOMIC64_OP_RETURN
|
|
#undef ATOMIC64_OP
|
|
|
|
extern long long atomic64_dec_if_positive(atomic64_t *v);
|
|
extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
|
|
extern long long atomic64_xchg(atomic64_t *v, long long new);
|
|
extern int atomic64_add_unless(atomic64_t *v, long long a, long long u);
|
|
|
|
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
|
|
#define atomic64_inc(v) atomic64_add(1LL, (v))
|
|
#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
|
|
#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
|
|
#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
|
|
#define atomic64_dec(v) atomic64_sub(1LL, (v))
|
|
#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v))
|
|
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
|
|
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
|
|
|
|
#endif /* _ASM_GENERIC_ATOMIC64_H */
|