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authorDavid Vrabel <david.vrabel@csr.com>2008-09-17 16:34:03 +0100
committerDavid Vrabel <dv02@dv02pc01.europe.root.pri>2008-09-17 16:54:22 +0100
commitccbe329bcd87924baed96474ec0a6725e3957897 (patch)
tree7d1f2737916d85aae76e54ab0fefff816fdf4316 /lib
parent45e9c0de2e86485f8b6633fd64ab19cfbff167f6 (diff)
downloadconfigs-ccbe329bcd87924baed96474ec0a6725e3957897.tar.gz
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/bitmap.c22
1 files changed, 22 insertions, 0 deletions
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);