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: David Vrabel <david.vrabel@csr.com>
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2 changed files with 23 additions and 0 deletions
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@ -130,6 +130,7 @@ extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,
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extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
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extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
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extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
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extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
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#define BITMAP_LAST_WORD_MASK(nbits) \
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( \
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22
lib/bitmap.c
22
lib/bitmap.c
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@ -1007,3 +1007,25 @@ int bitmap_allocate_region(unsigned long *bitmap, int pos, int order)
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return 0;
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}
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EXPORT_SYMBOL(bitmap_allocate_region);
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/**
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* bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.
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* @dst: destination buffer
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* @src: bitmap to copy
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* @nbits: number of bits in the bitmap
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*
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* Require nbits % BITS_PER_LONG == 0.
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*/
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void bitmap_copy_le(void *dst, const unsigned long *src, int nbits)
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{
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unsigned long *d = dst;
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int i;
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for (i = 0; i < nbits/BITS_PER_LONG; i++) {
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if (BITS_PER_LONG == 64)
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d[i] = cpu_to_le64(src[i]);
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else
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d[i] = cpu_to_le32(src[i]);
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}
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}
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EXPORT_SYMBOL(bitmap_copy_le);
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