1 files changed, 28 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/net.h b/arch/blackfin/include/asm/net.h
new file mode 100644
index 000000000..97cb46691
--- /dev/null
+++ b/arch/blackfin/include/asm/net.h
@@ -0,0 +1,28 @@
+/*
+ * net.h - misc Blackfin network helpers
+ *
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ASM_BFIN_RAND_MAC__
+#define __ASM_BFIN_RAND_MAC__
+
+/* If the board does not have a real MAC assigned to it, then generate a
+ * locally administrated pseudo-random one based on CYCLES and compile date.
+ */
+static inline void bfin_gen_rand_mac(uchar *mac_addr)
+{
+	/* make something up */
+	const char s[] = __DATE__;
+	size_t i;
+	u32 cycles;
+	for (i = 0; i < 6; ++i) {
+		asm("%0 = CYCLES;" : "=r" (cycles));
+		mac_addr[i] = cycles ^ s[i];
+	}
+	mac_addr[0] = (mac_addr[0] | 0x02) & ~0x01; /* make it local unicast */
+}
+
+#endif