HelloWorld模块加入内核

1.将linux内核包解压

2.make编译内核

3.make menuconfig

4.将helloword模块加入内核

(1)copy helloworld 到 driver/char/helloworld

(2)vim Kconfig

加入

config HELLO_WORLD

tristate "helloworld"

default m

help

this is a test

(3)vim driver/char/Kconfig

在endmenu前加入

source  "driver/char/helloworld/Kconfig"

(4)vim driver/char/Makefile

obj-$(CONFIG_HELLO_WORLD)+=helloword/(是文件夹)

hello.c文件

#include <linux/init.h>
#include <linux/module.h>

static int hello_init()
{
    printk(KERN_ALERT "Hello,world\n");
    return 0;
}
static void hello_exit()
{
    printk(KERN_ALERT "Goodbye,cruel world\n");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE("Dual BSD/GPL");

Makefile文件

CONFIG_HELLO_WORLD ?= m
ifneq ($(KERNELRELEASE),)
hello_world-objs := hello.o
obj-$(CONFIG_HELLO_WORLD) += hello_world.o
else
KERNELDIR=/home/zhb/software/linux-2.6.30.4/
PWD := $(shell pwd)
modules:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif
 clean:
rm -rf *.o *.ko *.order *.symvers *.mod.c *.markers

Kconfig文件(和driver/char/Kconfig不是同一个文件)

config HELLO_WORLD
tristate "helloworld"
default m
help
    this is a test