main.c

本程序是arm开发bios的实例代码

#include "types.h"
#include "bios.h"
#include "skbuff.h"
#include "eth.h"
#include "arp.h"
#include "ip.h"
#include "udp.h"
#include "console.h"
#include "utils.h"

int startup_mode;
int startup_param;

int net_handle(void)
{
	struct sk_buff *skb;
	struct ethhdr *eth_hdr;

	skb = alloc_skb(ETH_FRAME_LEN);

	if (eth_rcv(skb) != -1) {

		eth_hdr = (struct ethhdr *)(skb->data);
		skb_pull(skb, ETH_HLEN);

		if (ntohs(eth_hdr->h_proto) == ETH_P_ARP)
			arp_rcv_packet(skb);

		else if(ntohs(eth_hdr->h_proto) == ETH_P_IP)
		 	ip_rcv_packet(skb);
	}

	free_skb(skb);

	return 0;
}

int timeout_handle(void)
{
	static int timeout = 0;

	timeout++;
	if (timeout < 5000)
		return 0;

	timeout = 0;

	return 0;
}

int _main(unsigned long ip, unsigned long mode, unsigned long param)
{
	unsigned char eth_addr[ETH_ALEN];
	unsigned char *s = (unsigned char *)&ip;
	int timeout = 0;

	console_init();
	printf("Mini TFTP Server 1.0 (IP : %d.%d.%d.%d) - ", s[3], s[2], s[1], s[0]);

	startup_mode = mode;
	startup_param = param;

	switch (startup_mode) {
		
	case BOOT_LOAD_PROGRAM:
		printf("Load uClinux image \r\n");
		break;
		
	case BOOT_UPDATE_FIRMWARE:
		printf("Update Firmware\r\n");
		break;
			
	case BOOT_UPDATE_BIOS:
		printf("Update BIOS\r\n");
		break;
		
	case BOOT_LOAD_UART0:
		printf("Load Program by UART0\r\n");
		break;

	default:
		break;
	}

	printf("Usage (Windows 2000/XP) :\r\n");
	printf("  tftp -i %d.%d.%d.%d put <filename>\r\n\r\n", s[3], s[2], s[1], s[0]);

	eth_init();
	eth_get_addr(eth_addr);
	arp_init();
	ip_init(ip);
	udp_init();

	arp_add_entry(eth_addr, ip);

	while (1) {

		net_handle();
		timeout_handle();
		if (kbhit() && (getch() == KEY_ESC))
			break;
	}
	
	return 0;
}