标签:exit 依赖 kernel efi 编程 更新 make mkdir tar
内核模块编程入门:
一、准备工作:
1、打开一个终端,输入命令:
$ uname -r
结果:5.5.2-1-MANJARO
2、安装必要的内核文件:
sudo pacman -S linux55-headers
正在解析依赖关系...
正在查找软件包冲突...
软件包 (1) linux55-headers-5.5.2-1
全部安装大小: 47.53 MiB
净更新大小: 47.53 MiB
:: 进行安装吗? [Y/n]
按下回车,安装
3、准备代码目录:
mkdir -p drivers/hello
cd drivers/hello
二、编辑源代码和make文件:
1、使用vim编辑源码hello.c
1 #include <linux/module.h> 2 #include <linux/kernel.h> 3 4 static char *name = "guochao"; 5 static int count = 5; 6 7 module_param(name, charp, S_IRUGO); 8 module_param(count, int, S_IRUGO); 9 10 static int hello_init(void){ 11 int i = 0; 12 for(i = 0; i < count; i++){ 13 printk(KERN_INFO"Hello %d, %s! This is start%d\n", i, name, i); 14 } 15 return 0; 16 } 17 18 static void hello_exit(void){ 19 int i = count; 20 for(i = count; i > 0; i--){ 21 printk(KERN_INFO "Hello %d, %s! This is exit %d\n", i, name, i); 22 } 23 } 24 25 MODULE_LICENSE("GPL"); 26 module_init(hello_init); 27 module_exit(hello_exit);
代码比较简单,不多说明
Makefile文件为:
1 KVERS=$(shell uname -r) 2 #kernel modules 3 obj-m +=hello.o 4 5 #Specif flags for the module compilation. 6 #EXTRA_CFLAGS=-g -O0 7 8 buile:kernel_modules 9 10 kernel_modules: 11 make -C /lib/modules/$(KVERS)/build M=$(CURDIR) modules 12 13 clean: 14 make -C /lib/modules/$(KVERS)/build M=$(CURDIR) clean
目录下文件为:
$ ls
hello.c Makefile
三、模块的处理
0、编译模块
$ make
make -C /lib/modules/5.5.2-1-MANJARO/build M=/home/nication/drivers/hello modules
make[1]: 进入目录“/usr/lib/modules/5.5.2-1-MANJARO/build”
CC [M] /home/nication/drivers/hello/hello.o
Building modules, stage 2.
MODPOST 1 modules
CC [M] /home/nication/drivers/hello/hello.mod.o
LD [M] /home/nication/drivers/hello/hello.ko
make[1]: 离开目录“/usr/lib/modules/5.5.2-1-MANJARO/build”
make后的文件如下:
$ ls
hello.c hello.ko hello.mod hello.mod.c hello.mod.o hello.o Makefile modules.order Module.symvers
以下操作用root用户:
1、加载模块
# insmod hello.ko //加载模块
# lsmod | grep hello //查看加载的模块
hello 16384 0
# dmesg | grep Hello //查看模块的输出信息
[11817.505058] Hello 0, guochao! This is start0
[11817.505062] Hello 1, guochao! This is start1
[11817.505064] Hello 2, guochao! This is start2
[11817.505066] Hello 3, guochao! This is start3
[11817.505068] Hello 4, guochao! This is start4
2、卸载模块
# rmmod hello //卸载模块
# lsmod | grep hello //查看加载的模块
# dmesg | grep Hello //查看模块的输出信息
[12466.702875] Hello 5, guochao! This is exit 5
[12466.702880] Hello 4, guochao! This is exit 4
[12466.702882] Hello 3, guochao! This is exit 3
[12466.702884] Hello 2, guochao! This is exit 2
[12466.702885] Hello 1, guochao! This is exit 1
3、清除无用代码:
make clean
标签:exit 依赖 kernel efi 编程 更新 make mkdir tar
原文地址:https://www.cnblogs.com/guochaoxxl/p/12291771.html