77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_
|
|
#define _ASM_GENERIC_BITOPS_ATOMIC_H_
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/compiler.h>
|
|
#include <asm/barrier.h>
|
|
|
|
/*
|
|
* Implementation of atomic bitops using atomic-fetch ops.
|
|
* See Documentation/atomic_bitops.txt for details.
|
|
*/
|
|
|
|
static __always_inline void
|
|
arch_set_bit(unsigned int nr, volatile unsigned long *p)
|
|
{
|
|
p += BIT_WORD(nr);
|
|
arch_atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p);
|
|
}
|
|
|
|
static __always_inline void
|
|
arch_clear_bit(unsigned int nr, volatile unsigned long *p)
|
|
{
|
|
p += BIT_WORD(nr);
|
|
arch_atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p);
|
|
}
|
|
|
|
static __always_inline void
|
|
arch_change_bit(unsigned int nr, volatile unsigned long *p)
|
|
{
|
|
p += BIT_WORD(nr);
|
|
arch_atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p);
|
|
}
|
|
|
|
static __always_inline int
|
|
arch_test_and_set_bit(unsigned int nr, volatile unsigned long *p)
|
|
{
|
|
long old;
|
|
unsigned long mask = BIT_MASK(nr);
|
|
|
|
p += BIT_WORD(nr);
|
|
if (READ_ONCE(*p) & mask)
|
|
return 1;
|
|
|
|
old = arch_atomic_long_fetch_or(mask, (atomic_long_t *)p);
|
|
return !!(old & mask);
|
|
}
|
|
|
|
static __always_inline int
|
|
arch_test_and_clear_bit(unsigned int nr, volatile unsigned long *p)
|
|
{
|
|
long old;
|
|
unsigned long mask = BIT_MASK(nr);
|
|
|
|
p += BIT_WORD(nr);
|
|
if (!(READ_ONCE(*p) & mask))
|
|
return 0;
|
|
|
|
old = arch_atomic_long_fetch_andnot(mask, (atomic_long_t *)p);
|
|
return !!(old & mask);
|
|
}
|
|
|
|
static __always_inline int
|
|
arch_test_and_change_bit(unsigned int nr, volatile unsigned long *p)
|
|
{
|
|
long old;
|
|
unsigned long mask = BIT_MASK(nr);
|
|
|
|
p += BIT_WORD(nr);
|
|
old = arch_atomic_long_fetch_xor(mask, (atomic_long_t *)p);
|
|
return !!(old & mask);
|
|
}
|
|
|
|
#include <asm-generic/bitops/instrumented-atomic.h>
|
|
|
|
#endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */
|