linux pci driver中的ioremap

最新推荐文章于 2025-07-01 10:23:04 发布

God_s_apple

最新推荐文章于 2025-07-01 10:23:04 发布

阅读量1.4k

点赞数 1

CC 4.0 BY-SA版权

分类专栏： linux driver

本文链接：https://blog.youkuaiyun.com/christne1225i/article/details/53507518

本文探讨了在Linux PCI驱动中，ioremap函数如何将物理地址转换为虚拟地址，以便于程序访问设备寄存器。通过这个过程，开发者可以更方便地与硬件交互。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

xapp1022里：

static int XPCIe_init(void)
{
    gDev = pci_find_device (PCI_VENDOR_ID_XILINX, PCI_DEVICE_ID_XILINX_PCIE, gDev);
    if (NULL == gDev) {
        printk(/*KERN_WARNING*/"%s: Init: Hardware not found.\n", gDrvrName);
        //return (CRIT_ERR);
        return (-1);
    }

    if (0 > pci_enable_device(gDev)) {
        printk(/*KERN_WARNING*/"%s: Init: Device not enabled.\n", gDrvrName);
        //return (CRIT_ERR);
        return (-1);
    }

    // Get Base Address of registers from pci structure. Should come from pci_dev
    // structure, but that element seems to be missing on the development system.
    gBaseHdwr = pci_resource_start (gDev, 0);
    if (0 > gBaseHdwr) {
        printk(/*KERN_WARNING*/"%s: Init: Base Address not set.\n", gDrvrName);
        //return (CRIT_ERR);
        return (-1);
    } 
    printk(/*KERN_WARNING*/"Base hw val %X\n", (unsigned int)gBaseHdwr);

    gBaseLen = pci_resource_len (gDev, 0);