Linux裝置驅動開發詳解-第4章(一)-hello模組編譯過程

就不寫驅動程式，都忘了怎麼去編譯了

1  編寫來源程式hello.c

/*======================================================================    A simple kernel module: "hello world"             The initial developer of the original code is Baohua Song    <author@linuxdriver.cn>. All Rights Reserved.======================================================================*/#include <linux/init.h>#include <linux/module.h>MODULE_LICENSE("Dual BSD/GPL");static int hello_init(void){  printk(KERN_INFO " Hello World enter\n");  return 0;}static void hello_exit(void){  printk(KERN_INFO " Hello World exit\n ");}module_init(hello_init);module_exit(hello_exit);MODULE_AUTHOR("Liao Minghua");MODULE_DESCRIPTION("Hello World Module");MODULE_ALIAS("hello module");

2 編寫Makfle檔案

#ifneq ($(KERNELRELEASE),)obj-m := hello.o#elseKERNELDIR := /lib/modules/$(shell uname -r)/buildPWD := $(shell pwd)default:$(MAKE) -C $(KERNELDIR) M=$(PWD) modules#endifclean:rm -f *.ko *.mod.c *.mod.o *.o *.markers *.order *.symvers

3 編譯模組

[root@localhost hello]# make

編譯過程資訊：

make -C /lib/modules/2.6.33.3-85.fc13.i686.PAE/build M=/home/minghua/Documents/code/linuxdriver_code_tool/04/hello modules
make[1]: Entering directory `/usr/src/kernels/2.6.33.3-85.fc13.i686.PAE'
  CC [M]  /home/minghua/Documents/code/linuxdriver_code_tool/04/hello/hello.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/minghua/Documents/code/linuxdriver_code_tool/04/hello/hello.mod.o
  LD [M]  /home/minghua/Documents/code/linuxdriver_code_tool/04/hello/hello.ko
make[1]: Leaving directory `/usr/src/kernels/2.6.33.3-85.fc13.i686.PAE'

4 裝載核心模組

[root@localhost hello]# insmod hello.ko

5 卸載核心模組

[root@localhost hello]# rmmod hello

6 查看核心載入和卸載時的printk的資訊

[root@localhost hello]# dmesg | tail -8

輸出如下資訊：

 Hello World enter
 Hello World exit

注釋：dmesg | tail -8 意思是列印核心資訊的最後8行