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#ifndef __LINUX_BITMAP_H

#define __LINUX_BITMAP_H

#ifndef __ASSEMBLY__

#include <linux/types.h>

#include <linux/bitops.h>

#include <linux/string.h>

#include <linux/kernel.h>

/*

 * 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-<arch>/bitops.h headers

 * and other arch/<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_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_scnprintf(buf, len, src, nbits)       Print bitmap src to buf

 * 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_scnlistprintf(buf, len, src, nbits)   Print bitmap src as list to buf

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

 * 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

 */

/*

 * 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, int bits);

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

extern int __bitmap_equal(const unsigned long *bitmap1,

                        const unsigned long *bitmap2, int bits);

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

                        int bits);

extern void __bitmap_shift_right(unsigned long *dst,

                        const unsigned long *src, int shift, int bits);

extern void __bitmap_shift_left(unsigned long *dst,

                        const unsigned long *src, int shift, int bits);

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

                        const unsigned long *bitmap2, int bits);

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

                        const unsigned long *bitmap2, int bits);

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

                        const unsigned long *bitmap2, int bits);

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

                        const unsigned long *bitmap2, int bits);

extern int __bitmap_intersects(const unsigned long *bitmap1,

                        const unsigned long *bitmap2, int bits);

extern int __bitmap_subset(const unsigned long *bitmap1,

                        const unsigned long *bitmap2, int bits);

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

extern int bitmap_scnprintf(char *buf, unsigned int len,

                        const unsigned long *src, int nbits);

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_scnlistprintf(char *buf, unsigned int len,

                        const unsigned long *src, int nbits);

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

                        int nmaskbits);

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

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

extern int bitmap_bitremap(int oldbit,

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

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

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

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

#define BITMAP_LAST_WORD_MASK(nbits)                                    \

(                                                                       \

        ((nbits) % BITS_PER_LONG) ?                                     \

                (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \

)

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

{

        if (nbits <= BITS_PER_LONG)

                *dst = 0UL;

        else {

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

                memset(dst, 0, len);

        }

}

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

{

        size_t nlongs = BITS_TO_LONGS(nbits);

        if (nlongs > 1) {

                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,

                        int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *dst = *src;

        else {

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

                memcpy(dst, src, len);

        }

}

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

                        const unsigned long *src2, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *dst = *src1 & *src2;

        else

                __bitmap_and(dst, src1, src2, nbits);

}

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

                        const unsigned long *src2, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *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, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *dst = *src1 ^ *src2;

        else

                __bitmap_xor(dst, src1, src2, nbits);

}

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

                        const unsigned long *src2, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *dst = *src1 & ~(*src2);

        else

                __bitmap_andnot(dst, src1, src2, nbits);

}

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

                        int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);

        else

                __bitmap_complement(dst, src, nbits);

}

static inline int bitmap_equal(const unsigned long *src1,

                        const unsigned long *src2, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                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, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                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, int nbits)

{

        if (nbits <= BITS_PER_LONG)

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

        else

                return __bitmap_subset(src1, src2, nbits);

}

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

{

        if (nbits <= BITS_PER_LONG)

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

        else

                return __bitmap_empty(src, nbits);

}

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

{

        if (nbits <= BITS_PER_LONG)

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

        else

                return __bitmap_full(src, nbits);

}

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

{

        if (nbits <= BITS_PER_LONG)

                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, int n, int nbits)

{

        if (nbits <= BITS_PER_LONG)

                *dst = *src >> n;

        else

                __bitmap_shift_right(dst, src, n, nbits);

}

static inline void bitmap_shift_left(unsigned long *dst,

                        const unsigned long *src, int n, int nbits)

{

        if (nbits <= BITS_PER_LONG)

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

        else

                __bitmap_shift_left(dst, src, n, 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 */