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