146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_
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#define _TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_
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extern unsigned long _find_next_bit(const unsigned long *addr1,
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const unsigned long *addr2, unsigned long nbits,
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unsigned long start, unsigned long invert, unsigned long le);
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extern unsigned long _find_first_bit(const unsigned long *addr, unsigned long size);
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extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size);
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extern unsigned long _find_last_bit(const unsigned long *addr, unsigned long size);
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#ifndef find_next_bit
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/**
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* find_next_bit - find the next set bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The bitmap size in bits
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*
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* Returns the bit number for the next set bit
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* If no bits are set, returns @size.
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*/
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static inline
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unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
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unsigned long offset)
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{
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if (small_const_nbits(size)) {
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unsigned long val;
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if (unlikely(offset >= size))
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return size;
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val = *addr & GENMASK(size - 1, offset);
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return val ? __ffs(val) : size;
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}
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return _find_next_bit(addr, NULL, size, offset, 0UL, 0);
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}
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#endif
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#ifndef find_next_and_bit
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/**
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* find_next_and_bit - find the next set bit in both memory regions
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* @addr1: The first address to base the search on
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* @addr2: The second address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The bitmap size in bits
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*
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* Returns the bit number for the next set bit
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* If no bits are set, returns @size.
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*/
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static inline
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unsigned long find_next_and_bit(const unsigned long *addr1,
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const unsigned long *addr2, unsigned long size,
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unsigned long offset)
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{
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if (small_const_nbits(size)) {
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unsigned long val;
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if (unlikely(offset >= size))
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return size;
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val = *addr1 & *addr2 & GENMASK(size - 1, offset);
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return val ? __ffs(val) : size;
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}
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return _find_next_bit(addr1, addr2, size, offset, 0UL, 0);
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}
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#endif
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#ifndef find_next_zero_bit
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/**
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* find_next_zero_bit - find the next cleared bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The bitmap size in bits
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*
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* Returns the bit number of the next zero bit
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* If no bits are zero, returns @size.
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*/
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static inline
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unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
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unsigned long offset)
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{
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if (small_const_nbits(size)) {
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unsigned long val;
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if (unlikely(offset >= size))
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return size;
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val = *addr | ~GENMASK(size - 1, offset);
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return val == ~0UL ? size : ffz(val);
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}
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return _find_next_bit(addr, NULL, size, offset, ~0UL, 0);
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}
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#endif
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#ifndef find_first_bit
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/**
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* find_first_bit - find the first set bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum number of bits to search
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*
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* Returns the bit number of the first set bit.
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* If no bits are set, returns @size.
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*/
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static inline
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unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
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{
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if (small_const_nbits(size)) {
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unsigned long val = *addr & GENMASK(size - 1, 0);
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return val ? __ffs(val) : size;
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}
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return _find_first_bit(addr, size);
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}
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#endif /* find_first_bit */
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#ifndef find_first_zero_bit
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/**
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* find_first_zero_bit - find the first cleared bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum number of bits to search
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*
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* Returns the bit number of the first cleared bit.
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* If no bits are zero, returns @size.
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*/
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static inline
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unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
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{
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if (small_const_nbits(size)) {
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unsigned long val = *addr | ~GENMASK(size - 1, 0);
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return val == ~0UL ? size : ffz(val);
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}
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return _find_first_zero_bit(addr, size);
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}
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#endif
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#endif /*_TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_ */
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