net: Let ifconfig use NICs other than ether.0

[akaros.git] / kern / include / common.h

diff --git a/kern/include/common.h b/kern/include/common.h
index cf467a4..920da6a 100644 (file)
--- a/kern/include/common.h
+++ b/kern/include/common.h
@@ -29,6 +29,11 @@
 #define __ALIGN_MASK(x, mask) (((uintptr_t)(x) + (mask)) & ~(mask))
 /* Aligns x up to the alignment, e.g. 2^6. */
 #define ALIGN(x, a) ((typeof(x)) __ALIGN_MASK(x, (a) - 1))
+/* Aligns x down to the mask, e.g. (2^6 - 1)
+ * (round down if any mask bits are set)*/
+#define __ALIGN_MASK_DOWN(x, mask) ((uintptr_t)(x) & ~(mask))
+/* Aligns x down to the alignment, e.g. 2^6. */
+#define ALIGN_DOWN(x, a) ((typeof(x)) __ALIGN_MASK_DOWN(x, (a) - 1))
 /* Will return false for 0.  Debatable, based on what you want. */
 #define IS_PWR2(x) ((x) && !((x) & (x - 1)))