include/asm-generic/bitops/find.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_GENERIC_BITOPS_FIND_H_
   3 #define _ASM_GENERIC_BITOPS_FIND_H_
   4
   5 #ifndef find_next_bit
   6 /**
   7  * find_next_bit - find the next set bit in a memory region
   8  * @addr: The address to base the search on
   9  * @offset: The bitnumber to start searching at
  10  * @size: The bitmap size in bits
  11  *
  12  * Returns the bit number for the next set bit
  13  * If no bits are set, returns @size.
  14  */
  15 extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
  16                 size, unsigned long offset);
  17 #endif
  18
  19 #ifndef find_next_and_bit
  20 /**
  21  * find_next_and_bit - find the next set bit in both memory regions
  22  * @addr1: The first address to base the search on
  23  * @addr2: The second address to base the search on
  24  * @offset: The bitnumber to start searching at
  25  * @size: The bitmap size in bits
  26  *
  27  * Returns the bit number for the next set bit
  28  * If no bits are set, returns @size.
  29  */
  30 extern unsigned long find_next_and_bit(const unsigned long *addr1,
  31                 const unsigned long *addr2, unsigned long size,
  32                 unsigned long offset);
  33 #endif
  34
  35 #ifndef find_next_zero_bit
  36 /**
  37  * find_next_zero_bit - find the next cleared bit in a memory region
  38  * @addr: The address to base the search on
  39  * @offset: The bitnumber to start searching at
  40  * @size: The bitmap size in bits
  41  *
  42  * Returns the bit number of the next zero bit
  43  * If no bits are zero, returns @size.
  44  */
  45 extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
  46                 long size, unsigned long offset);
  47 #endif
  48
  49 #ifdef CONFIG_GENERIC_FIND_FIRST_BIT
  50
  51 /**
  52  * find_first_bit - find the first set bit in a memory region
  53  * @addr: The address to start the search at
  54  * @size: The maximum number of bits to search
  55  *
  56  * Returns the bit number of the first set bit.
  57  * If no bits are set, returns @size.
  58  */
  59 extern unsigned long find_first_bit(const unsigned long *addr,
  60                                     unsigned long size);
  61
  62 /**
  63  * find_first_zero_bit - find the first cleared bit in a memory region
  64  * @addr: The address to start the search at
  65  * @size: The maximum number of bits to search
  66  *
  67  * Returns the bit number of the first cleared bit.
  68  * If no bits are zero, returns @size.
  69  */
  70 extern unsigned long find_first_zero_bit(const unsigned long *addr,
  71                                          unsigned long size);
  72 #else /* CONFIG_GENERIC_FIND_FIRST_BIT */
  73
  74 #ifndef find_first_bit
  75 #define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
  76 #endif
  77 #ifndef find_first_zero_bit
  78 #define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
  79 #endif
  80
  81 #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
  82
  83 #endif /*_ASM_GENERIC_BITOPS_FIND_H_ */