2440 module test, hello world - life sucks

最新推荐文章于 2020-09-18 03:47:35 发布

原创最新推荐文章于 2020-09-18 03:47:35 发布 · 536 阅读

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#module #dependencies

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本文介绍了一个简单的Linux内核模块编写实例，展示了如何使用 printk 函数打印消息，并提供了 Makefile 构建文件示例。该模块在加载时显示一条欢迎信息，在卸载时显示鼓励信息。

hello.c

#include <linux/init.h>

#include <linux/module.h>

MODULE_LICENSE("Dual BSD/GPL");

static int hello_init(void)

{

printk(KERN_ALERT "wellcome to the real world, it sucks! ");

return 0;

}

static void hello_exit(void)

{

printk(KERN_ALERT "but you're gonna love it ! ");

}

module_init(hello_init);

module_exit(hello_exit);

------------------------------------------------------------------------------------------
Makefile

KERNELDIR =/home/fown/kernel/kernel-2.6.13

PWD := $(shell pwd)

CC =/usr/local/arm/3.4.1/bin/arm-linux-gcc

obj-m := hello.o

modules:

$(MAKE) -C $(KERNELDIR) M=$(PWD) modules

clean:

rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions

-------------------------------------------------------------------------------------

make modules
make -C /home/fown/kernel/kernel-2.6.13 M=/home/fown/ldd/hello modules
make[1]: Entering directory `/home/fown/kernel/kernel-2.6.13'

WARNING: Symbol version dump /home/fown/kernel/kernel-2.6.13/Module.symvers
           is missing; modules will have no dependencies and modversions.

CC [M] /home/fown/ldd/hello/hello.o
Building modules, stage 2.
MODPOST
CC      /home/fown/ldd/hello/hello.mod.o
LD [M] /home/fown/ldd/hello/hello.ko
make[1]: Leaving directory `/home/fown/kernel/kernel-2.6.13'

--------------------------------------------------------------------------------------
2440
--------------------------------------------------------------------------------------
[root@FriendlyARM /]# insmod hello.ko
wellcome to the real world, it sucks!
[root@FriendlyARM /]# lsmod
Module                  Size Used by
hello 1120 0 - Live 0xbf000000
[root@FriendlyARM /]# rmmod hello
but you're gonna love it !