[U-Boot] [PATCH v2 02/30] Add ALIGN_DOWN() to find next smallest alignment
Simon Glass
sjg at chromium.org
Sat Nov 15 02:18:20 CET 2014
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 at chromium.org>
---
Changes in v2: None
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.
--
2.1.0.rc2.206.gedb03e5
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