1 files changed, 60 insertions, 0 deletions
diff --git a/roms/u-boot/net/net_rand.h b/roms/u-boot/net/net_rand.h
new file mode 100644
index 000000000..6a52cda85
--- /dev/null
+++ b/roms/u-boot/net/net_rand.h
@@ -0,0 +1,60 @@
+/*
+ *	Copied from LiMon - BOOTP.
+ *
+ *	Copyright 1994, 1995, 2000 Neil Russell.
+ *	(See License)
+ *	Copyright 2000 Paolo Scaffardi
+ */
+
+#ifndef __NET_RAND_H__
+#define __NET_RAND_H__
+
+#include <common.h>
+#include <dm/uclass.h>
+#include <rng.h>
+
+/*
+ * Return a seed for the PRNG derived from the eth0 MAC address.
+ */
+static inline unsigned int seed_mac(void)
+{
+	unsigned char enetaddr[ARP_HLEN];
+	unsigned int seed;
+
+	/* get our mac */
+	memcpy(enetaddr, eth_get_ethaddr(), ARP_HLEN);
+
+	seed = enetaddr[5];
+	seed ^= enetaddr[4] << 8;
+	seed ^= enetaddr[3] << 16;
+	seed ^= enetaddr[2] << 24;
+	seed ^= enetaddr[1];
+	seed ^= enetaddr[0] << 8;
+
+	return seed;
+}
+
+/*
+ * Seed the random number generator using the eth0 MAC address.
+ */
+static inline void srand_mac(void)
+{
+	int ret;
+	struct udevice *devp;
+	u32 randv = 0;
+
+	if (IS_ENABLED(CONFIG_DM_RNG)) {
+		ret = uclass_get_device(UCLASS_RNG, 0, &devp);
+		if (ret) {
+			ret = dm_rng_read(devp, &randv, sizeof(randv));
+			if (ret < 0)
+				randv = 0;
+		}
+	}
+	if (randv)
+		srand(randv);
+	else
+		srand(seed_mac());
+}
+
+#endif /* __NET_RAND_H__ */