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188 lines
5.2 KiB
188 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_GENERIC_BITOPS_FIND_H_ |
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#define _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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#ifdef CONFIG_GENERIC_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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/** |
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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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#else /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
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#ifndef find_first_bit |
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#define find_first_bit(addr, size) find_next_bit((addr), (size), 0) |
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#endif |
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#ifndef find_first_zero_bit |
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#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0) |
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#endif |
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#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
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#ifndef find_last_bit |
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/** |
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* find_last_bit - find the last set bit in a memory region |
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* @addr: The address to start the search at |
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* @size: The number of bits to search |
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* |
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* Returns the bit number of the last set bit, or size. |
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*/ |
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static inline |
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unsigned long find_last_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 ? __fls(val) : size; |
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} |
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return _find_last_bit(addr, size); |
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} |
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#endif |
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/** |
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* find_next_clump8 - find next 8-bit clump with set bits in a memory region |
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* @clump: location to store copy of found clump |
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* @addr: address to base the search on |
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* @size: bitmap size in number of bits |
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* @offset: bit offset at which to start searching |
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* |
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* Returns the bit offset for the next set clump; the found clump value is |
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* copied to the location pointed by @clump. If no bits are set, returns @size. |
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*/ |
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extern unsigned long find_next_clump8(unsigned long *clump, |
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const unsigned long *addr, |
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unsigned long size, unsigned long offset); |
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#define find_first_clump8(clump, bits, size) \ |
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find_next_clump8((clump), (bits), (size), 0) |
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#endif /*_ASM_GENERIC_BITOPS_FIND_H_ */
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