222 lines
5.4 KiB
C
222 lines
5.4 KiB
C
#ifndef _LINUX_BITOPS_H
|
|
#define _LINUX_BITOPS_H
|
|
#include <asm/types.h>
|
|
|
|
#ifdef __KERNEL__
|
|
#define BIT(nr) (1UL << (nr))
|
|
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
|
|
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
|
|
#define BITS_PER_BYTE 8
|
|
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
|
|
#endif
|
|
|
|
/*
|
|
* Include this here because some architectures need generic_ffs/fls in
|
|
* scope
|
|
*/
|
|
#include <asm/bitops.h>
|
|
|
|
#define for_each_set_bit(bit, addr, size) \
|
|
for ((bit) = find_first_bit((addr), (size)); \
|
|
(bit) < (size); \
|
|
(bit) = find_next_bit((addr), (size), (bit) + 1))
|
|
|
|
/* Temporary */
|
|
#define for_each_bit(bit, addr, size) for_each_set_bit(bit, addr, size)
|
|
|
|
static __inline__ int get_bitmask_order(unsigned int count)
|
|
{
|
|
int order;
|
|
|
|
order = fls(count);
|
|
return order; /* We could be slightly more clever with -1 here... */
|
|
}
|
|
|
|
static __inline__ int get_count_order(unsigned int count)
|
|
{
|
|
int order;
|
|
|
|
order = fls(count) - 1;
|
|
if (count & (count - 1))
|
|
order++;
|
|
return order;
|
|
}
|
|
|
|
static inline unsigned long hweight_long(unsigned long w)
|
|
{
|
|
return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
|
|
}
|
|
|
|
/*
|
|
* Clearly slow versions of the hweightN() functions, their benefit is
|
|
* of course compile time evaluation of constant arguments.
|
|
*/
|
|
#define HWEIGHT8(w) \
|
|
( BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + \
|
|
(!!((w) & (1ULL << 0))) + \
|
|
(!!((w) & (1ULL << 1))) + \
|
|
(!!((w) & (1ULL << 2))) + \
|
|
(!!((w) & (1ULL << 3))) + \
|
|
(!!((w) & (1ULL << 4))) + \
|
|
(!!((w) & (1ULL << 5))) + \
|
|
(!!((w) & (1ULL << 6))) + \
|
|
(!!((w) & (1ULL << 7))) )
|
|
|
|
#define HWEIGHT16(w) (HWEIGHT8(w) + HWEIGHT8((w) >> 8))
|
|
#define HWEIGHT32(w) (HWEIGHT16(w) + HWEIGHT16((w) >> 16))
|
|
#define HWEIGHT64(w) (HWEIGHT32(w) + HWEIGHT32((w) >> 32))
|
|
|
|
/*
|
|
* Type invariant version that simply casts things to the
|
|
* largest type.
|
|
*/
|
|
#define HWEIGHT(w) HWEIGHT64((u64)(w))
|
|
|
|
/**
|
|
* rol32 - rotate a 32-bit value left
|
|
* @word: value to rotate
|
|
* @shift: bits to roll
|
|
*/
|
|
static inline __u32 rol32(__u32 word, unsigned int shift)
|
|
{
|
|
return (word << shift) | (word >> (32 - shift));
|
|
}
|
|
|
|
/**
|
|
* ror32 - rotate a 32-bit value right
|
|
* @word: value to rotate
|
|
* @shift: bits to roll
|
|
*/
|
|
static inline __u32 ror32(__u32 word, unsigned int shift)
|
|
{
|
|
return (word >> shift) | (word << (32 - shift));
|
|
}
|
|
|
|
/**
|
|
* rol16 - rotate a 16-bit value left
|
|
* @word: value to rotate
|
|
* @shift: bits to roll
|
|
*/
|
|
static inline __u16 rol16(__u16 word, unsigned int shift)
|
|
{
|
|
return (word << shift) | (word >> (16 - shift));
|
|
}
|
|
|
|
/**
|
|
* ror16 - rotate a 16-bit value right
|
|
* @word: value to rotate
|
|
* @shift: bits to roll
|
|
*/
|
|
static inline __u16 ror16(__u16 word, unsigned int shift)
|
|
{
|
|
return (word >> shift) | (word << (16 - shift));
|
|
}
|
|
|
|
/**
|
|
* rol8 - rotate an 8-bit value left
|
|
* @word: value to rotate
|
|
* @shift: bits to roll
|
|
*/
|
|
static inline __u8 rol8(__u8 word, unsigned int shift)
|
|
{
|
|
return (word << shift) | (word >> (8 - shift));
|
|
}
|
|
|
|
/**
|
|
* ror8 - rotate an 8-bit value right
|
|
* @word: value to rotate
|
|
* @shift: bits to roll
|
|
*/
|
|
static inline __u8 ror8(__u8 word, unsigned int shift)
|
|
{
|
|
return (word >> shift) | (word << (8 - shift));
|
|
}
|
|
|
|
static inline unsigned fls_long(unsigned long l)
|
|
{
|
|
if (sizeof(l) == 4)
|
|
return fls(l);
|
|
return fls64(l);
|
|
}
|
|
|
|
/**
|
|
* __ffs64 - find first set bit in a 64 bit word
|
|
* @word: The 64 bit word
|
|
*
|
|
* On 64 bit arches this is a synomyn for __ffs
|
|
* The result is not defined if no bits are set, so check that @word
|
|
* is non-zero before calling this.
|
|
*/
|
|
static inline unsigned long __ffs64(u64 word)
|
|
{
|
|
#if BITS_PER_LONG == 32
|
|
if (((u32)word) == 0UL)
|
|
return __ffs((u32)(word >> 32)) + 32;
|
|
#elif BITS_PER_LONG != 64
|
|
#error BITS_PER_LONG not 32 or 64
|
|
#endif
|
|
return __ffs((unsigned long)word);
|
|
}
|
|
|
|
#ifdef __KERNEL__
|
|
#ifdef CONFIG_GENERIC_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 size to search
|
|
*
|
|
* Returns the bit number of the first set bit.
|
|
*/
|
|
extern unsigned long find_first_bit(const unsigned long *addr,
|
|
unsigned long size);
|
|
|
|
/**
|
|
* find_first_zero_bit - find the first cleared bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit number of the first cleared bit.
|
|
*/
|
|
extern unsigned long find_first_zero_bit(const unsigned long *addr,
|
|
unsigned long size);
|
|
#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
|
|
|
|
#ifdef CONFIG_GENERIC_FIND_LAST_BIT
|
|
/**
|
|
* find_last_bit - find the last set bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit number of the first set bit, or size.
|
|
*/
|
|
extern unsigned long find_last_bit(const unsigned long *addr,
|
|
unsigned long size);
|
|
#endif /* CONFIG_GENERIC_FIND_LAST_BIT */
|
|
|
|
#ifdef CONFIG_GENERIC_FIND_NEXT_BIT
|
|
|
|
/**
|
|
* find_next_bit - find the next set bit in a memory region
|
|
* @addr: The address to base the search on
|
|
* @offset: The bitnumber to start searching at
|
|
* @size: The bitmap size in bits
|
|
*/
|
|
extern unsigned long find_next_bit(const unsigned long *addr,
|
|
unsigned long size, unsigned long offset);
|
|
|
|
/**
|
|
* find_next_zero_bit - find the next cleared bit in a memory region
|
|
* @addr: The address to base the search on
|
|
* @offset: The bitnumber to start searching at
|
|
* @size: The bitmap size in bits
|
|
*/
|
|
|
|
extern unsigned long find_next_zero_bit(const unsigned long *addr,
|
|
unsigned long size,
|
|
unsigned long offset);
|
|
|
|
#endif /* CONFIG_GENERIC_FIND_NEXT_BIT */
|
|
#endif /* __KERNEL__ */
|
|
#endif
|