/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TOOLS_LINUX_FIND_H_
#define _TOOLS_LINUX_FIND_H_
#ifndef _TOOLS_LINUX_BITMAP_H
#error tools: only <linux/bitmap.h> can be included directly
#endif
#include <linux/bitops.h>
unsigned long _find_next_bit(const unsigned long *addr1, unsigned long nbits,
unsigned long start);
unsigned long _find_next_and_bit(const unsigned long *addr1, const unsigned long *addr2,
unsigned long nbits, unsigned long start);
unsigned long _find_next_zero_bit(const unsigned long *addr, unsigned long nbits,
unsigned long start);
extern unsigned long _find_first_bit(const unsigned long *addr, unsigned long size);
extern unsigned long _find_first_and_bit(const unsigned long *addr1,
const unsigned long *addr2, unsigned long size);
extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size);
#ifndef find_next_bit
/**
* find_next_bit - find the next set bit in a memory region
* @ addr : The address to base the search on
* @ size : The bitmap size in bits
* @ offset : The bitnumber to start searching at
*
* Returns the bit number for the next set bit
* If no bits are set , returns @ size .
*/
static inline
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
unsigned long offset)
{
if (small_const_nbits(size)) {
unsigned long val;
if (unlikely(offset >= size))
return size;
val = *addr & GENMASK(size - 1 , offset);
return val ? __ffs(val) : size;
}
return _find_next_bit(addr, size, offset);
}
#endif
#ifndef find_next_and_bit
/**
* find_next_and_bit - find the next set bit in both memory regions
* @ addr1 : The first address to base the search on
* @ addr2 : The second address to base the search on
* @ size : The bitmap size in bits
* @ offset : The bitnumber to start searching at
*
* Returns the bit number for the next set bit
* If no bits are set , returns @ size .
*/
static inline
unsigned long find_next_and_bit(const unsigned long *addr1,
const unsigned long *addr2, unsigned long size,
unsigned long offset)
{
if (small_const_nbits(size)) {
unsigned long val;
if (unlikely(offset >= size))
return size;
val = *addr1 & *addr2 & GENMASK(size - 1 , offset);
return val ? __ffs(val) : size;
}
return _find_next_and_bit(addr1, addr2, size, offset);
}
#endif
#ifndef find_next_zero_bit
/**
* find_next_zero_bit - find the next cleared bit in a memory region
* @ addr : The address to base the search on
* @ size : The bitmap size in bits
* @ offset : The bitnumber to start searching at
*
* Returns the bit number of the next zero bit
* If no bits are zero , returns @ size .
*/
static inline
unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
unsigned long offset)
{
if (small_const_nbits(size)) {
unsigned long val;
if (unlikely(offset >= size))
return size;
val = *addr | ~GENMASK(size - 1 , offset);
return val == ~0 UL ? size : ffz(val);
}
return _find_next_zero_bit(addr, size, offset);
}
#endif
#ifndef find_first_bit
/**
* find_first_bit - find the first set bit in a memory region
* @ addr : The address to start the search at
* @ size : The maximum number of bits to search
*
* Returns the bit number of the first set bit .
* If no bits are set , returns @ size .
*/
static inline
unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
{
if (small_const_nbits(size)) {
unsigned long val = *addr & GENMASK(size - 1 , 0 );
return val ? __ffs(val) : size;
}
return _find_first_bit(addr, size);
}
#endif
#ifndef find_first_and_bit
/**
* find_first_and_bit - find the first set bit in both memory regions
* @ addr1 : The first address to base the search on
* @ addr2 : The second address to base the search on
* @ size : The bitmap size in bits
*
* Returns the bit number for the next set bit
* If no bits are set , returns @ size .
*/
static inline
unsigned long find_first_and_bit(const unsigned long *addr1,
const unsigned long *addr2,
unsigned long size)
{
if (small_const_nbits(size)) {
unsigned long val = *addr1 & *addr2 & GENMASK(size - 1 , 0 );
return val ? __ffs(val) : size;
}
return _find_first_and_bit(addr1, addr2, size);
}
#endif
#ifndef find_first_zero_bit
/**
* find_first_zero_bit - find the first cleared bit in a memory region
* @ addr : The address to start the search at
* @ size : The maximum number of bits to search
*
* Returns the bit number of the first cleared bit .
* If no bits are zero , returns @ size .
*/
static inline
unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
{
if (small_const_nbits(size)) {
unsigned long val = *addr | ~GENMASK(size - 1 , 0 );
return val == ~0 UL ? size : ffz(val);
}
return _find_first_zero_bit(addr, size);
}
#endif
#endif /*__LINUX_FIND_H_ */
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