1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_ 3 #define _ASM_GENERIC_BITOPS_ATOMIC_H_ 4 5 #include <linux/atomic.h> 6 #include <linux/compiler.h> 7 #include <asm/barrier.h> 8 9 /* 10 * Implementation of atomic bitops using atomic-fetch ops. 11 * See Documentation/atomic_bitops.txt for details. 12 */ 13 14 static __always_inline void 15 arch_set_bit(unsigned int nr, volatile unsigned long *p) 16 { 17 p += BIT_WORD(nr); 18 arch_atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p); 19 } 20 21 static __always_inline void 22 arch_clear_bit(unsigned int nr, volatile unsigned long *p) 23 { 24 p += BIT_WORD(nr); 25 arch_atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p); 26 } 27 28 static __always_inline void 29 arch_change_bit(unsigned int nr, volatile unsigned long *p) 30 { 31 p += BIT_WORD(nr); 32 arch_atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p); 33 } 34 35 static __always_inline int 36 arch_test_and_set_bit(unsigned int nr, volatile unsigned long *p) 37 { 38 long old; 39 unsigned long mask = BIT_MASK(nr); 40 41 p += BIT_WORD(nr); 42 old = arch_atomic_long_fetch_or(mask, (atomic_long_t *)p); 43 return !!(old & mask); 44 } 45 46 static __always_inline int 47 arch_test_and_clear_bit(unsigned int nr, volatile unsigned long *p) 48 { 49 long old; 50 unsigned long mask = BIT_MASK(nr); 51 52 p += BIT_WORD(nr); 53 old = arch_atomic_long_fetch_andnot(mask, (atomic_long_t *)p); 54 return !!(old & mask); 55 } 56 57 static __always_inline int 58 arch_test_and_change_bit(unsigned int nr, volatile unsigned long *p) 59 { 60 long old; 61 unsigned long mask = BIT_MASK(nr); 62 63 p += BIT_WORD(nr); 64 old = arch_atomic_long_fetch_xor(mask, (atomic_long_t *)p); 65 return !!(old & mask); 66 } 67 68 #include <asm-generic/bitops/instrumented-atomic.h> 69 70 #endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */ 71