^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <asm/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * __set_bit - Set a bit in memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * @nr: the bit to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * @addr: the address to start counting from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Unlike set_bit(), this function is non-atomic and may be reordered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * If it's called on the same region of memory simultaneously, the effect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * may be that only one operation succeeds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static inline void __set_bit(int nr, volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) unsigned long mask = BIT_MASK(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *p |= mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static inline void __clear_bit(int nr, volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned long mask = BIT_MASK(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *p &= ~mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * __change_bit - Toggle a bit in memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * @nr: the bit to change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * @addr: the address to start counting from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Unlike change_bit(), this function is non-atomic and may be reordered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * If it's called on the same region of memory simultaneously, the effect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * may be that only one operation succeeds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static inline void __change_bit(int nr, volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned long mask = BIT_MASK(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) *p ^= mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * __test_and_set_bit - Set a bit and return its old value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @nr: Bit to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * @addr: Address to count from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * This operation is non-atomic and can be reordered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * If two examples of this operation race, one can appear to succeed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * but actually fail. You must protect multiple accesses with a lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) unsigned long mask = BIT_MASK(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) unsigned long old = *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) *p = old | mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return (old & mask) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * __test_and_clear_bit - Clear a bit and return its old value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * @nr: Bit to clear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * @addr: Address to count from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * This operation is non-atomic and can be reordered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * If two examples of this operation race, one can appear to succeed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * but actually fail. You must protect multiple accesses with a lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) unsigned long mask = BIT_MASK(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned long old = *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) *p = old & ~mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return (old & mask) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* WARNING: non atomic and it can be reordered! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static inline int __test_and_change_bit(int nr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned long mask = BIT_MASK(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unsigned long old = *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *p = old ^ mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return (old & mask) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * test_bit - Determine whether a bit is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * @nr: bit number to test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * @addr: Address to start counting from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static inline int test_bit(int nr, const volatile unsigned long *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #endif /* _ASM_GENERIC_BITOPS_NON_ATOMIC_H_ */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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