Linux内核：从底层向上分析驱动程序层+链路层

作者：网络转载发布时间：[ 2012/12/25 10:21:35 ] 推荐标签：

　　函数如下：

static int ne_probe1(struct device *dev， int ioaddr)
{
.....................//合法性检查
/* Fixup for users that don't know that IRQ 2 is really IRQ 9，
    or don't know which one to set. */
dev->irq = 9;//设置中断类型号

    /* Snarf the interrupt now. There's no point in waiting since we cannot
       share and the board will usually be enabled. */
    {
int irqval = request_irq (dev->irq， ei_interrupt， 0， wordlength==2 ? "ne2000":"ne1000");//注册申请中断，中断处理函数为ei_interrupt
if (irqval) {
     printk (" unable to get IRQ %d (irqval=%d). "， dev->irq， irqval);
     return EAGAIN;
}
    }

dev->base_addr = ioaddr;

request_region(ioaddr， NE_IO_EXTENT， wordlength==2 ? "ne2000":"ne1000");//申请内存空间

for(i = 0; i < ETHER_ADDR_LEN; i++)
dev->dev_addr[i] = SA_prom[i];

    ethdev_init(dev);//调用函数对dev设备结构体进行初始化
    printk(" %s: %s found at %#x， using IRQ %d. "，
    dev->name， name， ioaddr， dev->irq);

if (ei_debug > 0)
printk(version);

    ei_status.name = name;
    ei_status.tx_start_page = start_page;
    ei_status.stop_page = stop_page;
    ei_status.word16 = (wordlength == 2);

    ei_status.rx_start_page = start_page + TX_PAGES;
#ifdef PACKETBUF_MEMSIZE
    /* Allow the packet buffer size to be overridden by know-it-alls. */
    ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
#endif

    ei_status.reset_8390 = &ne_reset_8390;
    ei_status.block_input = &ne_block_input;
    ei_status.block_output = &ne_block_output;
    NS8390_init(dev， 0);//配置网卡中的寄存器等到默认状态
    return 0;
}

　　初始化函数ethdev_init()在文件drivers/net/8390.c中。如下：

/* Initialize the rest of the 8390 device structure. */
int ethdev_init(struct device *dev)
{
    if (ei_debug > 1)
printk(version);

    if (dev->priv == NULL) {//申请私有空间存储具体网卡的结构体信息
struct ei_device *ei_local;//8390网卡设备的结构体

dev->priv = kmalloc(sizeof(struct ei_device)， GFP_KERNEL);//申请内核内存空间
memset(dev->priv， 0， sizeof(struct ei_device));
ei_local = (struct ei_device *)dev->priv;
#ifndef NO_PINGPONG
ei_local->pingpong = 1;
#endif
    }

    /* The open call may be overridden by the card-specific code. */
    if (dev->open == NULL)
dev->open = &ei_open;//设备的打开函数
    /* We should have a dev->stop entry also. */
    dev->hard_start_xmit = &ei_start_xmit;//设备的发送函数，定义在8390.c中
    dev->get_stats = get_stats;
#ifdef HAVE_MULTICAST
    dev->set_multicast_list = &set_multicast_list;
#endif