From: Sandrine Bailleux <sandrine.bailleux@arm.com>
Date: Thu, 16 Jun 2016 14:05:39 +0000 (+0100)
Subject: Introduce round_up/down() macros
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0146ae64c006956a281865f5688858d4846c781e;p=project%2Fbcm63xx%2Fatf.git

Introduce round_up/down() macros

This patch introduces the round_up() and round_down() macros,
which round up (respectively down) a value to a given boundary.
The boundary must be a power of two.

Change-Id: I589dd1074aeb5ec730dd523b4ebf098d55a7e967
---

diff --git a/include/lib/utils.h b/include/lib/utils.h
index d45dff34..9cc5468b 100644
--- a/include/lib/utils.h
+++ b/include/lib/utils.h
@@ -38,4 +38,21 @@
 #define IS_POWER_OF_TWO(x)			\
 	(((x) & ((x) - 1)) == 0)
 
+/*
+ * The round_up() macro rounds up a value to the given boundary in a
+ * type-agnostic yet type-safe manner. The boundary must be a power of two.
+ * In other words, it computes the smallest multiple of boundary which is
+ * greater than or equal to value.
+ *
+ * round_down() is similar but rounds the value down instead.
+ */
+#define round_boundary(value, boundary)		\
+	((__typeof__(value))((boundary) - 1))
+
+#define round_up(value, boundary)		\
+	((((value) - 1) | round_boundary(value, boundary)) + 1)
+
+#define round_down(value, boundary)		\
+	((value) & ~round_boundary(value, boundary))
+
 #endif /* __UTILS_H__ */