1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
 3#define _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
 4
 5#include <asm-generic/bitops/generic-non-atomic.h>
 6
 7#define arch___set_bit generic___set_bit
 8#define arch___clear_bit generic___clear_bit
 9#define arch___change_bit generic___change_bit
 
 
 
 
 
 
 
 
 
 
10
11#define arch___test_and_set_bit generic___test_and_set_bit
12#define arch___test_and_clear_bit generic___test_and_clear_bit
13#define arch___test_and_change_bit generic___test_and_change_bit
14
15#define arch_test_bit generic_test_bit
16#define arch_test_bit_acquire generic_test_bit_acquire
 
 
17
18#include <asm-generic/bitops/non-instrumented-non-atomic.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
19
20#endif /* _ASM_GENERIC_BITOPS_NON_ATOMIC_H_ */

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
  3#define _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
  4
  5#include <asm/types.h>
  6
  7/**
  8 * __set_bit - Set a bit in memory
  9 * @nr: the bit to set
 10 * @addr: the address to start counting from
 11 *
 12 * Unlike set_bit(), this function is non-atomic and may be reordered.
 13 * If it's called on the same region of memory simultaneously, the effect
 14 * may be that only one operation succeeds.
 15 */
 16static inline void __set_bit(int nr, volatile unsigned long *addr)
 17{
 18	unsigned long mask = BIT_MASK(nr);
 19	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 20
 21	*p  |= mask;
 22}
 
 23
 24static inline void __clear_bit(int nr, volatile unsigned long *addr)
 25{
 26	unsigned long mask = BIT_MASK(nr);
 27	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 28
 29	*p &= ~mask;
 30}
 31
 32/**
 33 * __change_bit - Toggle a bit in memory
 34 * @nr: the bit to change
 35 * @addr: the address to start counting from
 36 *
 37 * Unlike change_bit(), this function is non-atomic and may be reordered.
 38 * If it's called on the same region of memory simultaneously, the effect
 39 * may be that only one operation succeeds.
 40 */
 41static inline void __change_bit(int nr, volatile unsigned long *addr)
 42{
 43	unsigned long mask = BIT_MASK(nr);
 44	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 45
 46	*p ^= mask;
 47}
 48
 49/**
 50 * __test_and_set_bit - Set a bit and return its old value
 51 * @nr: Bit to set
 52 * @addr: Address to count from
 53 *
 54 * This operation is non-atomic and can be reordered.
 55 * If two examples of this operation race, one can appear to succeed
 56 * but actually fail.  You must protect multiple accesses with a lock.
 57 */
 58static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
 59{
 60	unsigned long mask = BIT_MASK(nr);
 61	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 62	unsigned long old = *p;
 63
 64	*p = old | mask;
 65	return (old & mask) != 0;
 66}
 67
 68/**
 69 * __test_and_clear_bit - Clear a bit and return its old value
 70 * @nr: Bit to clear
 71 * @addr: Address to count from
 72 *
 73 * This operation is non-atomic and can be reordered.
 74 * If two examples of this operation race, one can appear to succeed
 75 * but actually fail.  You must protect multiple accesses with a lock.
 76 */
 77static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
 78{
 79	unsigned long mask = BIT_MASK(nr);
 80	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 81	unsigned long old = *p;
 82
 83	*p = old & ~mask;
 84	return (old & mask) != 0;
 85}
 86
 87/* WARNING: non atomic and it can be reordered! */
 88static inline int __test_and_change_bit(int nr,
 89					    volatile unsigned long *addr)
 90{
 91	unsigned long mask = BIT_MASK(nr);
 92	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 93	unsigned long old = *p;
 94
 95	*p = old ^ mask;
 96	return (old & mask) != 0;
 97}
 98
 99/**
100 * test_bit - Determine whether a bit is set
101 * @nr: bit number to test
102 * @addr: Address to start counting from
103 */
104static inline int test_bit(int nr, const volatile unsigned long *addr)
105{
106	return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
107}
108
109#endif /* _ASM_GENERIC_BITOPS_NON_ATOMIC_H_ */