linux 添加内核模块和应用程序

1.Kernel Module

1.1 add .c file

./kernel_imx/drivers/hello_module/hello.c:

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

static int __init hello_module_init(void)
{
        printk(KERN_DEBUG "hello_module_init\n");
        return 0;
}

static void __exit hello_module_exit(void)
{
        printk(KERN_DEBUG "hello_module_exit\n");
}

module_init(hello_module_init);
module_exit(hello_module_exit);
MODULE_LICENSE("GPL");

1.2 add Makefile

./kernel_imx/drivers/hello_module/Makefile:

PWD = $(shell pwd)
KERNEL_SRC = /home/xxx/Projects/Android/android4.4.3/kernel_imx/
CROSS_COMPILE = /home/xxx/Projects/Android/android4.4.3/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.7/bin/arm-linux-androideabi-

obj-m := hello.o
all:
        make ARCH=arm CFLAGS_MODULE=-fno-pic  CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNEL_SRC) M=$(PWD) modules
clean:
        make ARCH=arm CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNEL_SRC) M=$(PWD) clean

1.3 compile

cd ./kernel_imx/driver/hello_module

make

1.4 result

2. Application

2.1 add .c file

./kernel_imx/drivers/hello_app/hello_app.c

#include <stdio.h>
#include <string.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{
    printf("hello app\n");
    return 0;
}

2.2 add Makefile

./kernel_imx/drivers/hello_app/Makefile

EXEC = hello_app
CC := arm-linux-androideabi-gcc
#CC := arm-none-linux-gnueabi-gcc
all:  $(EXEC) 


$(EXEC): hello_app.c
        $(CC)   hello_app.c   -static -o hello_app
clean:
        rm -f hello_app *.o

ps. need download android NDK and get the toolchain