671 lines
20 KiB
C
671 lines
20 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_FIND_H_
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#define __LINUX_FIND_H_
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#ifndef __LINUX_BITMAP_H
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#error only <linux/bitmap.h> can be included directly
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#endif
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#include <linux/bitops.h>
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unsigned long _find_next_bit(const unsigned long *addr1, unsigned long nbits,
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unsigned long start);
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unsigned long _find_next_and_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long nbits, unsigned long start);
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unsigned long _find_next_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long nbits, unsigned long start);
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unsigned long _find_next_or_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long nbits, unsigned long start);
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unsigned long _find_next_zero_bit(const unsigned long *addr, unsigned long nbits,
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unsigned long start);
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extern unsigned long _find_first_bit(const unsigned long *addr, unsigned long size);
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unsigned long __find_nth_bit(const unsigned long *addr, unsigned long size, unsigned long n);
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unsigned long __find_nth_and_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long size, unsigned long n);
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unsigned long __find_nth_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long size, unsigned long n);
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unsigned long __find_nth_and_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
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const unsigned long *addr3, unsigned long size,
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unsigned long n);
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extern unsigned long _find_first_and_bit(const unsigned long *addr1,
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const unsigned long *addr2, 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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#ifdef __BIG_ENDIAN
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unsigned long _find_first_zero_bit_le(const unsigned long *addr, unsigned long size);
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unsigned long _find_next_zero_bit_le(const unsigned long *addr, unsigned
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long size, unsigned long offset);
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unsigned long _find_next_bit_le(const unsigned long *addr, unsigned
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long size, unsigned long offset);
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#endif
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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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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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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, size, offset);
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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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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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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_and_bit(addr1, addr2, size, offset);
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}
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#endif
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#ifndef find_next_andnot_bit
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/**
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* find_next_andnot_bit - find the next set bit in *addr1 excluding all the bits
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* in *addr2
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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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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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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_andnot_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_andnot_bit(addr1, addr2, size, offset);
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}
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#endif
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#ifndef find_next_or_bit
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/**
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* find_next_or_bit - find the next set bit in either 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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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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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_or_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_or_bit(addr1, addr2, size, offset);
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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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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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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_zero_bit(addr, size, offset);
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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
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/**
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* find_nth_bit - find N'th 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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* @n: The number of set bit, which position is needed, counting from 0
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*
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* The following is semantically equivalent:
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* idx = find_nth_bit(addr, size, 0);
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* idx = find_first_bit(addr, size);
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*
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* Returns the bit number of the N'th set bit.
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* If no such, returns @size.
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*/
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static inline
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unsigned long find_nth_bit(const unsigned long *addr, unsigned long size, unsigned long n)
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{
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if (n >= size)
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return size;
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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 ? fns(val, n) : size;
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}
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return __find_nth_bit(addr, size, n);
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}
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/**
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* find_nth_and_bit - find N'th set bit in 2 memory regions
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* @addr1: The 1st address to start the search at
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* @addr2: The 2nd address to start the search at
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* @size: The maximum number of bits to search
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* @n: The number of set bit, which position is needed, counting from 0
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*
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* Returns the bit number of the N'th set bit.
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* If no such, returns @size.
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*/
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static inline
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unsigned long find_nth_and_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long size, unsigned long n)
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{
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if (n >= size)
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return size;
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if (small_const_nbits(size)) {
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unsigned long val = *addr1 & *addr2 & GENMASK(size - 1, 0);
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return val ? fns(val, n) : size;
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}
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return __find_nth_and_bit(addr1, addr2, size, n);
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}
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/**
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* find_nth_andnot_bit - find N'th set bit in 2 memory regions,
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* flipping bits in 2nd region
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* @addr1: The 1st address to start the search at
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* @addr2: The 2nd address to start the search at
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* @size: The maximum number of bits to search
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* @n: The number of set bit, which position is needed, counting from 0
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*
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* Returns the bit number of the N'th set bit.
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* If no such, returns @size.
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*/
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static inline
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unsigned long find_nth_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long size, unsigned long n)
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{
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if (n >= size)
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return size;
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if (small_const_nbits(size)) {
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unsigned long val = *addr1 & (~*addr2) & GENMASK(size - 1, 0);
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return val ? fns(val, n) : size;
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}
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return __find_nth_andnot_bit(addr1, addr2, size, n);
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}
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/**
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* find_nth_and_andnot_bit - find N'th set bit in 2 memory regions,
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* excluding those set in 3rd region
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* @addr1: The 1st address to start the search at
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* @addr2: The 2nd address to start the search at
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* @addr3: The 3rd address to start the search at
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* @size: The maximum number of bits to search
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* @n: The number of set bit, which position is needed, counting from 0
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*
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* Returns the bit number of the N'th set bit.
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* If no such, returns @size.
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*/
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static __always_inline
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unsigned long find_nth_and_andnot_bit(const unsigned long *addr1,
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const unsigned long *addr2,
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const unsigned long *addr3,
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unsigned long size, unsigned long n)
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{
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if (n >= size)
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return size;
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if (small_const_nbits(size)) {
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unsigned long val = *addr1 & *addr2 & (~*addr3) & GENMASK(size - 1, 0);
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return val ? fns(val, n) : size;
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}
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return __find_nth_and_andnot_bit(addr1, addr2, addr3, size, n);
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}
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#ifndef find_first_and_bit
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/**
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* find_first_and_bit - find the first 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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* @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_first_and_bit(const unsigned long *addr1,
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const unsigned long *addr2,
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unsigned long size)
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{
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if (small_const_nbits(size)) {
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unsigned long val = *addr1 & *addr2 & GENMASK(size - 1, 0);
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return val ? __ffs(val) : size;
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}
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return _find_first_and_bit(addr1, addr2, size);
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}
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#endif
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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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#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_and_bit_wrap - 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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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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*
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* Returns the bit number for the next set bit, or first set bit up to @offset
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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_wrap(const unsigned long *addr1,
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const unsigned long *addr2,
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unsigned long size, unsigned long offset)
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{
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unsigned long bit = find_next_and_bit(addr1, addr2, size, offset);
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if (bit < size)
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return bit;
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bit = find_first_and_bit(addr1, addr2, offset);
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return bit < offset ? bit : size;
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}
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/**
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* find_next_bit_wrap - find the next set bit in both memory regions
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* @addr: The first address to base the search on
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* @size: The bitmap size in bits
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* @offset: The bitnumber to start searching at
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*
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* Returns the bit number for the next set bit, or first set bit up to @offset
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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_wrap(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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unsigned long bit = find_next_bit(addr, size, offset);
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if (bit < size)
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return bit;
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bit = find_first_bit(addr, offset);
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return bit < offset ? bit : size;
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}
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/*
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* Helper for for_each_set_bit_wrap(). Make sure you're doing right thing
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* before using it alone.
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*/
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static inline
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unsigned long __for_each_wrap(const unsigned long *bitmap, unsigned long size,
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unsigned long start, unsigned long n)
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{
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unsigned long bit;
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/* If not wrapped around */
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if (n > start) {
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/* and have a bit, just return it. */
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bit = find_next_bit(bitmap, size, n);
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if (bit < size)
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return bit;
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/* Otherwise, wrap around and ... */
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n = 0;
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}
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/* Search the other part. */
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bit = find_next_bit(bitmap, start, n);
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return bit < start ? bit : size;
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}
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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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#if defined(__LITTLE_ENDIAN)
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static inline unsigned long find_next_zero_bit_le(const void *addr,
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unsigned long size, unsigned long offset)
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{
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return find_next_zero_bit(addr, size, offset);
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}
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static inline unsigned long find_next_bit_le(const void *addr,
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unsigned long size, unsigned long offset)
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{
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return find_next_bit(addr, size, offset);
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}
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static inline unsigned long find_first_zero_bit_le(const void *addr,
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unsigned long size)
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{
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return find_first_zero_bit(addr, size);
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}
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#elif defined(__BIG_ENDIAN)
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#ifndef find_next_zero_bit_le
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static inline
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unsigned long find_next_zero_bit_le(const void *addr, unsigned
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long size, unsigned long offset)
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{
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if (small_const_nbits(size)) {
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unsigned long val = *(const unsigned long *)addr;
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if (unlikely(offset >= size))
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return size;
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val = swab(val) | ~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_zero_bit_le(addr, size, offset);
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}
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#endif
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#ifndef find_first_zero_bit_le
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static inline
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unsigned long find_first_zero_bit_le(const void *addr, unsigned long size)
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{
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if (small_const_nbits(size)) {
|
|
unsigned long val = swab(*(const unsigned long *)addr) | ~GENMASK(size - 1, 0);
|
|
|
|
return val == ~0UL ? size : ffz(val);
|
|
}
|
|
|
|
return _find_first_zero_bit_le(addr, size);
|
|
}
|
|
#endif
|
|
|
|
#ifndef find_next_bit_le
|
|
static inline
|
|
unsigned long find_next_bit_le(const void *addr, unsigned
|
|
long size, unsigned long offset)
|
|
{
|
|
if (small_const_nbits(size)) {
|
|
unsigned long val = *(const unsigned long *)addr;
|
|
|
|
if (unlikely(offset >= size))
|
|
return size;
|
|
|
|
val = swab(val) & GENMASK(size - 1, offset);
|
|
return val ? __ffs(val) : size;
|
|
}
|
|
|
|
return _find_next_bit_le(addr, size, offset);
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
#error "Please fix <asm/byteorder.h>"
|
|
#endif
|
|
|
|
#define for_each_set_bit(bit, addr, size) \
|
|
for ((bit) = 0; (bit) = find_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
|
|
|
|
#define for_each_and_bit(bit, addr1, addr2, size) \
|
|
for ((bit) = 0; \
|
|
(bit) = find_next_and_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
|
|
(bit)++)
|
|
|
|
#define for_each_andnot_bit(bit, addr1, addr2, size) \
|
|
for ((bit) = 0; \
|
|
(bit) = find_next_andnot_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
|
|
(bit)++)
|
|
|
|
#define for_each_or_bit(bit, addr1, addr2, size) \
|
|
for ((bit) = 0; \
|
|
(bit) = find_next_or_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
|
|
(bit)++)
|
|
|
|
/* same as for_each_set_bit() but use bit as value to start with */
|
|
#define for_each_set_bit_from(bit, addr, size) \
|
|
for (; (bit) = find_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
|
|
|
|
#define for_each_clear_bit(bit, addr, size) \
|
|
for ((bit) = 0; \
|
|
(bit) = find_next_zero_bit((addr), (size), (bit)), (bit) < (size); \
|
|
(bit)++)
|
|
|
|
/* same as for_each_clear_bit() but use bit as value to start with */
|
|
#define for_each_clear_bit_from(bit, addr, size) \
|
|
for (; (bit) = find_next_zero_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
|
|
|
|
/**
|
|
* for_each_set_bitrange - iterate over all set bit ranges [b; e)
|
|
* @b: bit offset of start of current bitrange (first set bit)
|
|
* @e: bit offset of end of current bitrange (first unset bit)
|
|
* @addr: bitmap address to base the search on
|
|
* @size: bitmap size in number of bits
|
|
*/
|
|
#define for_each_set_bitrange(b, e, addr, size) \
|
|
for ((b) = 0; \
|
|
(b) = find_next_bit((addr), (size), b), \
|
|
(e) = find_next_zero_bit((addr), (size), (b) + 1), \
|
|
(b) < (size); \
|
|
(b) = (e) + 1)
|
|
|
|
/**
|
|
* for_each_set_bitrange_from - iterate over all set bit ranges [b; e)
|
|
* @b: bit offset of start of current bitrange (first set bit); must be initialized
|
|
* @e: bit offset of end of current bitrange (first unset bit)
|
|
* @addr: bitmap address to base the search on
|
|
* @size: bitmap size in number of bits
|
|
*/
|
|
#define for_each_set_bitrange_from(b, e, addr, size) \
|
|
for (; \
|
|
(b) = find_next_bit((addr), (size), (b)), \
|
|
(e) = find_next_zero_bit((addr), (size), (b) + 1), \
|
|
(b) < (size); \
|
|
(b) = (e) + 1)
|
|
|
|
/**
|
|
* for_each_clear_bitrange - iterate over all unset bit ranges [b; e)
|
|
* @b: bit offset of start of current bitrange (first unset bit)
|
|
* @e: bit offset of end of current bitrange (first set bit)
|
|
* @addr: bitmap address to base the search on
|
|
* @size: bitmap size in number of bits
|
|
*/
|
|
#define for_each_clear_bitrange(b, e, addr, size) \
|
|
for ((b) = 0; \
|
|
(b) = find_next_zero_bit((addr), (size), (b)), \
|
|
(e) = find_next_bit((addr), (size), (b) + 1), \
|
|
(b) < (size); \
|
|
(b) = (e) + 1)
|
|
|
|
/**
|
|
* for_each_clear_bitrange_from - iterate over all unset bit ranges [b; e)
|
|
* @b: bit offset of start of current bitrange (first set bit); must be initialized
|
|
* @e: bit offset of end of current bitrange (first unset bit)
|
|
* @addr: bitmap address to base the search on
|
|
* @size: bitmap size in number of bits
|
|
*/
|
|
#define for_each_clear_bitrange_from(b, e, addr, size) \
|
|
for (; \
|
|
(b) = find_next_zero_bit((addr), (size), (b)), \
|
|
(e) = find_next_bit((addr), (size), (b) + 1), \
|
|
(b) < (size); \
|
|
(b) = (e) + 1)
|
|
|
|
/**
|
|
* for_each_set_bit_wrap - iterate over all set bits starting from @start, and
|
|
* wrapping around the end of bitmap.
|
|
* @bit: offset for current iteration
|
|
* @addr: bitmap address to base the search on
|
|
* @size: bitmap size in number of bits
|
|
* @start: Starting bit for bitmap traversing, wrapping around the bitmap end
|
|
*/
|
|
#define for_each_set_bit_wrap(bit, addr, size, start) \
|
|
for ((bit) = find_next_bit_wrap((addr), (size), (start)); \
|
|
(bit) < (size); \
|
|
(bit) = __for_each_wrap((addr), (size), (start), (bit) + 1))
|
|
|
|
/**
|
|
* for_each_set_clump8 - iterate over bitmap for each 8-bit clump with set bits
|
|
* @start: bit offset to start search and to store the current iteration offset
|
|
* @clump: location to store copy of current 8-bit clump
|
|
* @bits: bitmap address to base the search on
|
|
* @size: bitmap size in number of bits
|
|
*/
|
|
#define for_each_set_clump8(start, clump, bits, size) \
|
|
for ((start) = find_first_clump8(&(clump), (bits), (size)); \
|
|
(start) < (size); \
|
|
(start) = find_next_clump8(&(clump), (bits), (size), (start) + 8))
|
|
|
|
#endif /*__LINUX_FIND_H_ */
|