/* * vivi/net/rarp.c  * * Based on u-boot * * $Id: rarp.c,v 1.0 2004/08/12 11:14:01 kingmonkey Exp $ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Description: net rarp protocol routines . * */ #include "config.h"#include "printk.h"#include "command.h"#include "net.h"#include "bootp.h"#include "rarp.h"#include "tftp.h"#define TIMEOUT		5		/* Seconds before trying BOOTP again */#ifndef	CONFIG_NET_RETRY_COUNT# define TIMEOUT_COUNT	5		/* # of timeouts before giving up  */#else# define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)#endif#undef DEBUGint		RarpTry;/* *	Handle a RARP received packet. */static voidRarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3){#ifdef	DEBUG	printk("Good RARP,Go ......\n");#endif	TftpStart();}/* *	Timeout on BOOTP request. */static voidRarpTimeout(void){	if (RarpTry >= TIMEOUT_COUNT) {		printk("\nRetry count exceeded; starting again\n");		NetStartAgain();	} else {		NetSetTimeout (TIMEOUT * CFG_HZ, RarpTimeout);		RarpRequest();	}}voidRarpRequest (void){	int i;	volatile uchar *pkt;	ARP_t *	rarp;//	printk("RARP broadcast %d\n", ++RarpTry);	pkt = NetTxPacket;	pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP);	rarp = (ARP_t *)pkt;	rarp->ar_hrd = htons (ARP_ETHER);	rarp->ar_pro = htons (PROT_IP);	rarp->ar_hln = 6;	rarp->ar_pln = 4;	rarp->ar_op  = htons (RARPOP_REQUEST);	memcpy (&rarp->ar_data[0],  NetOurEther, 6);	/* source ET addr */	memcpy (&rarp->ar_data[6],  &NetOurIP,   4);	/* source IP addr */	memcpy (&rarp->ar_data[10], NetOurEther, 6);	/* dest ET addr = source ET addr ??*/		/* dest. IP addr set to broadcast */	for (i = 0; i <= 3; i++) {		rarp->ar_data[16 + i] = 0xff;	}	NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);	NetSetTimeout(TIMEOUT * CFG_HZ, RarpTimeout);	NetSetHandler(RarpHandler);}