| [354] | 1 | /* $Id: bitops.h,v 1.1 2000/04/23 14:55:27 ktk Exp $ */
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| 2 |
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| 3 | #ifndef _I386_BITOPS_H
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| 4 | #define _I386_BITOPS_H
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| 5 |
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| 6 | /*
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| 7 | * Copyright 1992, Linus Torvalds.
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * These have to be done with inline assembly: that way the bit-setting
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| 12 | * is guaranteed to be atomic. All bit operations return 0 if the bit
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| 13 | * was cleared before the operation and != 0 if it was not.
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| 14 | *
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| 15 | * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
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| 16 | */
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| 17 |
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| 18 | /*
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| 19 | * Function prototypes to keep gcc -Wall happy
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| 20 | */
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| 21 | extern void set_bit(int nr, volatile void * addr);
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| 22 | extern void clear_bit(int nr, volatile void * addr);
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| 23 | extern void change_bit(int nr, volatile void * addr);
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| 24 | extern int test_and_set_bit(int nr, volatile void * addr);
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| 25 | extern int test_and_clear_bit(int nr, volatile void * addr);
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| 26 | extern int test_and_change_bit(int nr, volatile void * addr);
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| 27 | extern int __constant_test_bit(int nr, const volatile void * addr);
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| 28 | extern int __test_bit(int nr, volatile void * addr);
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| 29 | extern int find_first_zero_bit(void * addr, unsigned size);
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| 30 | extern int find_next_zero_bit (void * addr, int size, int offset);
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| 31 | extern unsigned long ffz(unsigned long word);
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| 32 |
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| 33 | #endif /* _I386_BITOPS_H */
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