We have an ALIGN() macro - add a comment as to what this does. Also add a new ALIGN_DOWN() macro, which aligns a value to the next smallest multiple.
Signed-off-by: Simon Glass sjg@chromium.org ---
include/common.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/include/common.h b/include/common.h index ecf7fca..28fba79 100644 --- a/include/common.h +++ b/include/common.h @@ -970,9 +970,24 @@ static inline phys_addr_t map_to_sysmem(const void *ptr) } \ )
+/** + * ALIGN() - return an aligned value not less than the given value + * + * @x: Value to align + * @a: Alignment to use, e.g. 4 to align to multiples of 4 + */ #define ALIGN(x,a) __ALIGN_MASK((x),(typeof(x))(a)-1) + #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
+/** + * ALIGN_DOWN() - return an aligned value not greater than the given value + * + * @x: Value to align + * @a: Alignment to use, e.g. 4 to align to multiples of 4 + */ +#define ALIGN_DOWN(x, a) ((x) & ~((typeof(x))(a) - 1UL)) + /* * ARCH_DMA_MINALIGN is defined in asm/cache.h for each architecture. It * is used to align DMA buffers.