你知道Uboot中的net是怎样的？

//net读

//api/api.c

static cfp_t calls_table[API_MAXCALL] = { NULL, };

void api_init(void)

{

...

calls_table[API_RSVD] = NULL;
calls_table[API_GETC] = &API_getc;
calls_table[API_PUTC] = &API_putc;
calls_table[API_TSTC] = &API_tstc;
calls_table[API_PUTS] = &API_puts;
calls_table[API_RESET] = &API_reset;
calls_table[API_GET_SYS_INFO] = &API_get_sys_info;
calls_table[API_UDELAY] = &API_udelay;
calls_table[API_GET_TIMER] = &API_get_timer;
calls_table[API_DEV_ENUM] = &API_dev_enum;
calls_table[API_DEV_OPEN] = &API_dev_open;
calls_table[API_DEV_CLOSE] = &API_dev_close;
calls_table[API_DEV_READ] = &API_dev_read;
calls_table[API_DEV_WRITE] = &API_dev_write;
calls_table[API_ENV_GET] = &API_env_get;
calls_table[API_ENV_SET] = &API_env_set;
calls_table[API_ENV_ENUM] = &API_env_enum;
calls_no = API_MAXCALL;

...

}

static int API_dev_read(va_list ap)

{

...

else if (di->type & DEV_TYP_NET)

{

len_net = (int *)va_arg(ap, u_int32_t);
if (!len_net)
return API_EINVAL;
if (*len_net <= 0)
return API_EINVAL;

act_len_net = (int *)va_arg(ap, u_int32_t);
if (!act_len_net)
return API_EINVAL;

*act_len_net = dev_read_net(di->cookie, buf, *len_net);

}

...

}

//api/api_net.c

int dev_read_net(void *cookie, void *buf, int len)
{

return eth_receive(buf, len);

}

//net/eth.c

int eth_receive(volatile void *packet, int length)
{

if (eth_rcv_current == eth_rcv_last) 
{

...
push_packet = eth_save_packet;
eth_rx();
push_packet = pp;

if (eth_rcv_current == eth_rcv_last)
return -1;

...

}

//drivers\net\higmacv300\Higmac.c

int eth_rx(void)

{

...

NetReceive(NetRxPackets[0], len);

...

}

//net/net.c

void NetReceive(volatile uchar * inpkt, int len)

{

...

x = ntohs(vet->vet_type);

...

switch (x) 

{

case PROT_ARP:

...

switch (ntohs(arp->ar_op)) 

{

...

case ARPOP_REQUEST:

...

case ARPOP_REPLY:

...

tmp = NetReadIP(&arp->ar_data[6]);

if (tmp == NetArpWaitReplyIP) 

{

...

(*packetHandler)(0,0,0,0);

...

}

case PROT_RARP:

...

case PROT_IP:

...

if (ip->ip_p == IPPROTO_ICMP)

{

...

switch (icmph->type)

{

case ICMP_REDIRECT:

...

case ICMP_ECHO_REPLY:

...

case ICMP_ECHO_REQUEST:

...

}

}

}

}

} 

static rxhand_f *packetHandler; /* Current RX packet handler */

void NetSetHandler(rxhand_f * f)

{
packetHandler = f;
}

//net/net.h

typedef void rxhand_f(uchar *, unsigned, unsigned, unsigned);

举例tftp通讯

//net/tftp.c

void TftpStart (void)

{

...

NetSetHandler (TftpHandler);

...

}

static void TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)

{

...

s = (ushort *)pkt;

proto = *s++;

...

switch (ntohs(proto)) 

{

case TFTP_RRQ:

case TFTP_WRQ:
break;
case TFTP_ACK:

}

}

好记性不如烂笔头