As an essential part of operating system, device drivers must be reliable and efficient, because wrong operation can make a fatal system error and hardware performance depends on the device driver. Therefore, it must be developed carefully. In this paper, I present Linux Device Driver coding for...
config PACKT_MYCDEV tristate "Our packtpub special Character driver" default m help Say Y here if you want to support the /dev/mycdev device. The /dev/mycdev device is used to access packtpub. 在同一目录的 makefile 中添加: obj-$(CONFIG_PACKT_MYCDEV) += mychardev.o 更新Makefile...
// linux-2.6.22.6/drivers/usb/core/driver.c int usb_register_device_driver(struct usb_device_driver *new_udriver, struct module *owner) { int retval = 0; if (usb_disabled()) return -ENODEV; // for_devices = 1 将和USB设备匹配成功 new_udriver->drvwrap.for_devices = 1; new_udrive...
虚拟内存子系统的主要成分是虚拟地址空间(virtual address space)的概念; 进程所使用的一组内存不等同于物理内存地址; 当进程使用一个虚拟地址时, 内核和MMU协同定位其在内存中的实际物理位置; 现在有些CPU包含了能自动把虚拟地址转换为物理地址的硬件电路; 把RAM(随机存取存储器 -- random access memory,RAM内存),...
Chapter 6. Advanced Char Driver Operations In Chapter 3, we built a complete device driver that the user can write to and read from. But a real device usually offers more functionality than synchronous read and write. Now that we’re equipped with debugging tools should something go awry—...
The filp argument in the method is the same as that introduced in Chapter 3, while vma contains the information about the virtual address range that is used to access the device. Therefore, much of the work has been done by the kernel; to implement mmap, the driver only has to build su...
boot/dts/imx6ull.dtsi Linux 5.4内核源码 Linux-5.4\drivers\irqchip\irq-gic.c...:驱动程序注册platform_driver 它的of_match_table里有多个of_device_id,表示能支持多个设备有多种版本的GIC,在内核为每一类GIC定义一个结构体of_device_id...GIC 在设备树中指定GIC,内核驱动程序根据设备树来选择、初始化GIC...
大家都一下推荐成吨的书,这么多书中,总得选一两个,个人觉得目前有口碑、属经典、比较常见的是这两个:经典的 LDD《Linux Device Drivers》和 有国内有口碑的 《Linux设备驱动开发详解-宋宝华》。 面经相关 部分引自 coding-style-and-more: C 编写规范和其他。CC-BY-NC-SA 4.0。 (gitee.com)。 嵌入式相关...
MODULEDEVICETABLE 宏(见 [标题编号.]) 10 Linux 设备驱动 第三版 - [JJJ] 12.1.5. 注册一个 PCI 驱动(见 [标题编号.]) 12.1.6. 老式 PCI 探测(见 [标题编号.]) 12.1.7. 使能 PCI 设备(见 [标题编号.]) 12.1.8. 存取配置空间(见 [标题编号.]) 12.1.9. 存取 I/O 和内存空间(见 [标题...
与内存无关,暂时不详述,以后有机会讲到device tree系列再详述。 memory node 通过memblock_add加入到memblock.memory对应的memblock_type链表中进行管理。 接下来到arm64_memblock_init函数: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 void__initarm64_memblock_init(void){...memblock_reserve(__pa_symbol...