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Commit ccbe329b authored by David Vrabel's avatar David Vrabel Committed by David Vrabel
Browse files

bitmap: add bitmap_copy_le() 



bitmap_copy_le() copies a bitmap, putting the bits into little-endian
order (i.e., each unsigned long word in the bitmap is put into
little-endian order).

The UWB stack used bitmaps to manage Medium Access Slot availability,
and these bitmaps need to be written to the hardware in LE order.

Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
parent 45e9c0de

include/linux/bitmap.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -130,6 +130,7 @@ extern void bitmap_fold(unsigned long *dst, const unsigned long *orig, 
extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);

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

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

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

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





#define BITMAP_LAST_WORD_MASK(nbits)					\

#define BITMAP_LAST_WORD_MASK(nbits)					\

(									\

(									\

lib/bitmap.c

+22 −0
Original line number Original line Diff line number Diff line
@@ -1007,3 +1007,25 @@ int bitmap_allocate_region(unsigned long *bitmap, int pos, int order) 
	return 0;

	return 0;

}

}

EXPORT_SYMBOL(bitmap_allocate_region);

EXPORT_SYMBOL(bitmap_allocate_region);



/**

 * bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.

 * @dst:   destination buffer

 * @src:   bitmap to copy

 * @nbits: number of bits in the bitmap

 *

 * Require nbits % BITS_PER_LONG == 0.

 */

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

{

	unsigned long *d = dst;

	int i;



	for (i = 0; i < nbits/BITS_PER_LONG; i++) {

		if (BITS_PER_LONG == 64)

			d[i] = cpu_to_le64(src[i]);

		else

			d[i] = cpu_to_le32(src[i]);

	}

}

EXPORT_SYMBOL(bitmap_copy_le);