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-rw-r--r--include/libc-internal.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/libc-internal.h b/include/libc-internal.h
index 0c0fa02..78f82da 100644
--- a/include/libc-internal.h
+++ b/include/libc-internal.h
@@ -50,4 +50,24 @@ extern void __init_misc (int, char **, char **);
/* Cast an integer or a pointer VAL to integer with proper type. */
# define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
+/* Align a value by rounding down to closest size.
+ e.g. Using size of 4096, we get this behavior:
+ {4095, 4096, 4097} = {0, 4096, 4096}. */
+#define ALIGN_DOWN(base, size) ((base) & -((__typeof__ (base)) (size)))
+
+/* Align a value by rounding up to closest size.
+ e.g. Using size of 4096, we get this behavior:
+ {4095, 4096, 4097} = {4096, 4096, 8192}.
+
+ Note: The size argument has side effects (expanded multiple times). */
+#define ALIGN_UP(base, size) ALIGN_DOWN ((base) + (size) - 1, (size))
+
+/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer. */
+#define PTR_ALIGN_DOWN(base, size) \
+ ((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size)))
+
+/* Same as ALIGN_UP(), but automatically casts when base is a pointer. */
+#define PTR_ALIGN_UP(base, size) \
+ ((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
+
#endif /* _LIBC_INTERNAL */