| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #ifndef __LIBFROG_BITMASK_H_ |
| #define __LIBFROG_BITMASK_H_ |
| |
| #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| |
| static inline void set_bit(int nr, volatile unsigned long *addr) |
| { |
| unsigned long mask = BIT_MASK(nr); |
| unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); |
| |
| *p |= mask; |
| } |
| |
| static inline void clear_bit(int nr, volatile unsigned long *addr) |
| { |
| unsigned long mask = BIT_MASK(nr); |
| unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); |
| |
| *p &= ~mask; |
| } |
| |
| static inline int test_bit(int nr, const volatile unsigned long *addr) |
| { |
| unsigned long mask = BIT_MASK(nr); |
| unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); |
| |
| return *p & mask; |
| } |
| |
| /* Sets and returns original value of the bit */ |
| static inline int test_and_set_bit(int nr, volatile unsigned long *addr) |
| { |
| if (test_bit(nr, addr)) |
| return 1; |
| set_bit(nr, addr); |
| return 0; |
| } |
| |
| #endif /* __LIBFROG_BITMASK_H_ */ |