Reading the IEEE specs shows that the bits have to be reversed when

mapping an OUI to the MII id registers.

From drochner NetBSD

1 files changed, 23 insertions, 1 deletions

diff --git a/sys/dev/mii/mii.c b/sys/dev/mii/mii.c
index 686b4d59bb3..911db2409fa 100644
--- a/sys/dev/mii/mii.c
+++ b/sys/dev/mii/mii.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mii.c,v 1.16 2005/07/09 21:32:06 brad Exp $	*/
+/*	$OpenBSD: mii.c,v 1.17 2005/07/22 11:50:53 brad Exp $	*/
 /*	$NetBSD: mii.c,v 1.19 2000/02/02 17:09:44 thorpej Exp $	*/
 
 /*-
@@ -304,3 +304,25 @@ mii_down(struct mii_data *mii)
 	     child = LIST_NEXT(child, mii_list))
 		(void) PHY_SERVICE(child, mii, MII_DOWN);
 }
+
+static unsigned char
+bitreverse(unsigned char x)
+{
+	static unsigned char nibbletab[16] = {
+		0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15
+	};
+
+	return ((nibbletab[x & 15] << 4) | nibbletab[x >> 4]);
+}
+
+int
+mii_oui(int id1, int id2)
+{
+	int h;
+
+	h = (id1 << 6) | (id2 >> 10);
+
+	return ((bitreverse(h >> 16) << 16) |
+		(bitreverse((h >> 8) & 255) << 8) |
+		bitreverse(h & 255));
+}