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author | David Vrabel <david.vrabel@csr.com> | 2008-09-17 16:34:03 +0100 |
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committer | David Vrabel <dv02@dv02pc01.europe.root.pri> | 2008-09-17 16:54:22 +0100 |
commit | ccbe329bcd87924baed96474ec0a6725e3957897 (patch) | |
tree | 7d1f2737916d85aae76e54ab0fefff816fdf4316 | |
parent | 45e9c0de2e86485f8b6633fd64ab19cfbff167f6 (diff) | |
download | linux-3.10-ccbe329bcd87924baed96474ec0a6725e3957897.tar.gz linux-3.10-ccbe329bcd87924baed96474ec0a6725e3957897.tar.bz2 linux-3.10-ccbe329bcd87924baed96474ec0a6725e3957897.zip |
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>
-rw-r--r-- | include/linux/bitmap.h | 1 | ||||
-rw-r--r-- | lib/bitmap.c | 22 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 89781fd4885..5379913aca5 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -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 void bitmap_release_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) \ ( \ diff --git a/lib/bitmap.c b/lib/bitmap.c index 06fb57c86de..c2006bfeea4 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -1007,3 +1007,25 @@ int bitmap_allocate_region(unsigned long *bitmap, int pos, int order) return 0; } 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); |