Subversion Repositories Kolibri OS

#ifndef __LINUX_BITMAP_H

#define __LINUX_BITMAP_H

#ifndef __ASSEMBLY__

#include 

#include 

#include 

#include 

/*

 * bitmaps provide bit arrays that consume one or more unsigned

 * longs.  The bitmap interface and available operations are listed

 * here, in bitmap.h

 *

 * Function implementations generic to all architectures are in

 * lib/bitmap.c.  Functions implementations that are architecture

 * specific are in various include/asm-/bitops.h headers

 * and other arch/ specific files.

 *

 * See lib/bitmap.c for more details.

 */

/*

 * The available bitmap operations and their rough meaning in the

 * case that the bitmap is a single unsigned long are thus:

 *

 * Note that nbits should be always a compile time evaluable constant.

 * Otherwise many inlines will generate horrible code.

 *

 * bitmap_zero(dst, nbits)			*dst = 0UL

 * bitmap_fill(dst, nbits)			*dst = ~0UL

 * bitmap_copy(dst, src, nbits)			*dst = *src

 * bitmap_and(dst, src1, src2, nbits)		*dst = *src1 & *src2

 * bitmap_or(dst, src1, src2, nbits)		*dst = *src1 | *src2

 * bitmap_xor(dst, src1, src2, nbits)		*dst = *src1 ^ *src2

 * bitmap_andnot(dst, src1, src2, nbits)	*dst = *src1 & ~(*src2)

 * bitmap_complement(dst, src, nbits)		*dst = ~(*src)

 * bitmap_equal(src1, src2, nbits)		Are *src1 and *src2 equal?

 * bitmap_intersects(src1, src2, nbits) 	Do *src1 and *src2 overlap?

 * bitmap_subset(src1, src2, nbits)		Is *src1 a subset of *src2?

 * bitmap_empty(src, nbits)			Are all bits zero in *src?

 * bitmap_full(src, nbits)			Are all bits set in *src?

 * bitmap_weight(src, nbits)			Hamming Weight: number set bits

 * bitmap_set(dst, pos, nbits)			Set specified bit area

 * bitmap_clear(dst, pos, nbits)		Clear specified bit area

 * bitmap_find_next_zero_area(buf, len, pos, n, mask)	Find bit free area

 * bitmap_find_next_zero_area_off(buf, len, pos, n, mask)	as above

 * bitmap_shift_right(dst, src, n, nbits)	*dst = *src >> n

 * bitmap_shift_left(dst, src, n, nbits)	*dst = *src << n

 * bitmap_remap(dst, src, old, new, nbits)	*dst = map(old, new)(src)

 * bitmap_bitremap(oldbit, old, new, nbits)	newbit = map(old, new)(oldbit)

 * bitmap_onto(dst, orig, relmap, nbits)	*dst = orig relative to relmap

 * bitmap_fold(dst, orig, sz, nbits)		dst bits = orig bits mod sz

 * bitmap_parse(buf, buflen, dst, nbits)	Parse bitmap dst from kernel buf

 * bitmap_parse_user(ubuf, ulen, dst, nbits)	Parse bitmap dst from user buf

 * bitmap_parselist(buf, dst, nbits)		Parse bitmap dst from kernel buf

 * bitmap_parselist_user(buf, dst, nbits)	Parse bitmap dst from user buf

 * bitmap_find_free_region(bitmap, bits, order)	Find and allocate bit region

 * bitmap_release_region(bitmap, pos, order)	Free specified bit region

 * bitmap_allocate_region(bitmap, pos, order)	Allocate specified bit region

 * bitmap_from_u32array(dst, nbits, buf, nwords) *dst = *buf (nwords 32b words)

 * bitmap_to_u32array(buf, nwords, src, nbits)	*buf = *dst (nwords 32b words)

 */

/*

 * Also the following operations in asm/bitops.h apply to bitmaps.

 *

 * set_bit(bit, addr)			*addr |= bit

 * clear_bit(bit, addr)			*addr &= ~bit

 * change_bit(bit, addr)		*addr ^= bit

 * test_bit(bit, addr)			Is bit set in *addr?

 * test_and_set_bit(bit, addr)		Set bit and return old value

 * test_and_clear_bit(bit, addr)	Clear bit and return old value

 * test_and_change_bit(bit, addr)	Change bit and return old value

 * find_first_zero_bit(addr, nbits)	Position first zero bit in *addr

 * find_first_bit(addr, nbits)		Position first set bit in *addr

 * find_next_zero_bit(addr, nbits, bit)	Position next zero bit in *addr >= bit

 * find_next_bit(addr, nbits, bit)	Position next set bit in *addr >= bit

 */

/*

 * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used

 * to declare an array named 'name' of just enough unsigned longs to

 * contain all bit positions from 0 to 'bits' - 1.

 */

/*

 * lib/bitmap.c provides these functions:

 */

extern int __bitmap_empty(const unsigned long *bitmap, unsigned int nbits);

extern int __bitmap_full(const unsigned long *bitmap, unsigned int nbits);

extern int __bitmap_equal(const unsigned long *bitmap1,

			  const unsigned long *bitmap2, unsigned int nbits);

extern void __bitmap_complement(unsigned long *dst, const unsigned long *src,

			unsigned int nbits);

extern void __bitmap_shift_right(unsigned long *dst, const unsigned long *src,

				unsigned int shift, unsigned int nbits);

extern void __bitmap_shift_left(unsigned long *dst, const unsigned long *src,

				unsigned int shift, unsigned int nbits);

extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,

			const unsigned long *bitmap2, unsigned int nbits);

extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,

			const unsigned long *bitmap2, unsigned int nbits);

extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,

			const unsigned long *bitmap2, unsigned int nbits);

extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,

			const unsigned long *bitmap2, unsigned int nbits);

extern int __bitmap_intersects(const unsigned long *bitmap1,

			const unsigned long *bitmap2, unsigned int nbits);

extern int __bitmap_subset(const unsigned long *bitmap1,

			const unsigned long *bitmap2, unsigned int nbits);

extern int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);

extern void bitmap_set(unsigned long *map, unsigned int start, int len);

extern void bitmap_clear(unsigned long *map, unsigned int start, int len);

extern unsigned long bitmap_find_next_zero_area_off(unsigned long *map,

						    unsigned long size,

						    unsigned long start,

						    unsigned int nr,

						    unsigned long align_mask,

						    unsigned long align_offset);

/**

 * bitmap_find_next_zero_area - find a contiguous aligned zero area

 * @map: The address to base the search on

 * @size: The bitmap size in bits

 * @start: The bitnumber to start searching at

 * @nr: The number of zeroed bits we're looking for

 * @align_mask: Alignment mask for zero area

 *

 * The @align_mask should be one less than a power of 2; the effect is that

 * the bit offset of all zero areas this function finds is multiples of that

 * power of 2. A @align_mask of 0 means no alignment is required.

 */

static inline unsigned long

bitmap_find_next_zero_area(unsigned long *map,

			   unsigned long size,

			   unsigned long start,

			   unsigned int nr,

			   unsigned long align_mask)

{

	return bitmap_find_next_zero_area_off(map, size, start, nr,

					      align_mask, 0);

}

extern int __bitmap_parse(const char *buf, unsigned int buflen, int is_user,

			unsigned long *dst, int nbits);

extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen,

			unsigned long *dst, int nbits);

extern int bitmap_parselist(const char *buf, unsigned long *maskp,

			int nmaskbits);

extern int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen,

			unsigned long *dst, int nbits);

extern void bitmap_remap(unsigned long *dst, const unsigned long *src,

		const unsigned long *old, const unsigned long *new, unsigned int nbits);

extern int bitmap_bitremap(int oldbit,

		const unsigned long *old, const unsigned long *new, int bits);

extern void bitmap_onto(unsigned long *dst, const unsigned long *orig,

		const unsigned long *relmap, unsigned int bits);

extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,

		unsigned int sz, unsigned int nbits);

extern int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order);

extern void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order);

extern int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order);

extern unsigned int bitmap_from_u32array(unsigned long *bitmap,

					 unsigned int nbits,

					 const u32 *buf,

					 unsigned int nwords);

extern unsigned int bitmap_to_u32array(u32 *buf,

				       unsigned int nwords,

				       const unsigned long *bitmap,

				       unsigned int nbits);

#ifdef __BIG_ENDIAN

extern void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits);

#else

#define bitmap_copy_le bitmap_copy

#endif

extern unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int ord, unsigned int nbits);

extern int bitmap_print_to_pagebuf(bool list, char *buf,

				   const unsigned long *maskp, int nmaskbits);

#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))

#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))

#define small_const_nbits(nbits) \

	(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)

static inline void bitmap_zero(unsigned long *dst, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		*dst = 0UL;

	else {

		unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);

		memset(dst, 0, len);

	}

}

static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)

{

	unsigned int nlongs = BITS_TO_LONGS(nbits);

	if (!small_const_nbits(nbits)) {

		unsigned int len = (nlongs - 1) * sizeof(unsigned long);

		memset(dst, 0xff,  len);

	}

	dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);

}

static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,

			unsigned int nbits)

{

	if (small_const_nbits(nbits))

		*dst = *src;

	else {

		unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);

		memcpy(dst, src, len);

	}

}

static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;

	return __bitmap_and(dst, src1, src2, nbits);

}

static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		*dst = *src1 | *src2;

	else

		__bitmap_or(dst, src1, src2, nbits);

}

static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		*dst = *src1 ^ *src2;

	else

		__bitmap_xor(dst, src1, src2, nbits);

}

static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return (*dst = *src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;

	return __bitmap_andnot(dst, src1, src2, nbits);

}

static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,

			unsigned int nbits)

{

	if (small_const_nbits(nbits))

		*dst = ~(*src);

	else

		__bitmap_complement(dst, src, nbits);

}

static inline int bitmap_equal(const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));

	else

		return __bitmap_equal(src1, src2, nbits);

}

static inline int bitmap_intersects(const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;

	else

		return __bitmap_intersects(src1, src2, nbits);

}

static inline int bitmap_subset(const unsigned long *src1,

			const unsigned long *src2, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));

	else

		return __bitmap_subset(src1, src2, nbits);

}

static inline int bitmap_empty(const unsigned long *src, unsigned nbits)

{

	if (small_const_nbits(nbits))

		return ! (*src & BITMAP_LAST_WORD_MASK(nbits));

	return find_first_bit(src, nbits) == nbits;

}

static inline int bitmap_full(const unsigned long *src, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));

	return find_first_zero_bit(src, nbits) == nbits;

}

static __always_inline int bitmap_weight(const unsigned long *src, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));

	return __bitmap_weight(src, nbits);

}

static inline void bitmap_shift_right(unsigned long *dst, const unsigned long *src,

				unsigned int shift, int nbits)

{

	if (small_const_nbits(nbits))

		*dst = (*src & BITMAP_LAST_WORD_MASK(nbits)) >> shift;

	else

		__bitmap_shift_right(dst, src, shift, nbits);

}

static inline void bitmap_shift_left(unsigned long *dst, const unsigned long *src,

				unsigned int shift, unsigned int nbits)

{

	if (small_const_nbits(nbits))

		*dst = (*src << shift) & BITMAP_LAST_WORD_MASK(nbits);

	else

		__bitmap_shift_left(dst, src, shift, nbits);

}

static inline int bitmap_parse(const char *buf, unsigned int buflen,

			unsigned long *maskp, int nmaskbits)

{

	return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);

}

#endif /* __ASSEMBLY__ */

#endif /* __LINUX_BITMAP_H */