运行内核模块

Posted 2021-06-25 5念since

编译内核

sudo ./run_debian_arm64.sh build_kernel

编译根文件系统

sudo ./run_debian_arm64.sh build_rootfs

编译内核模块

export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-
export BASEINCLUDE=/home/rlk/rlk/runninglinuxkernel_5.0

加载内核模块
kernel_module.c

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

static int __init kernel_module_init(void)
{
        printk(KERN_EMERG "Kernel module init.\\n");
        return 0;
}

static void __exit kernel_module_exit(void)
{
        printk("kernel module exit.\\n");
}

module_init(kernel_module_init);
module_exit(kernel_module_exit);

MODULE_LICENSE("GPL");

Makefile

BASEINCLUDE ?= /home/rlk/rlk/runninglinuxkernel_5.0

kernel_module-obj := kernel_module.o
obj-m := kernel_module.o

all :
        $(MAKE) -C $(BASEINCLUDE) M=$(PWD) modules;

clean:
        $(MAKE) -C $(BASEINCLUDE) SUBDIRS=$(PWD) clean;
        rm -f *.ko;

查看内核模块信息
file kernel_module.ko

kernel_module.ko: ELF 64-bit LSB relocatable, ARM aarch64, version 1 (SYSV), BuildID[sha1]=93b3746157c2f64aa7f2f68f1ccd2ec482fc2f03, with debug_info, not stripped

modinfo kernel_module.ko

filename:       /mnt/kernel_module.ko
license:        GPL
vermagic:       5.0.0+ SMP mod_unload modversions aarch64
name:           kernel_module
depends:

• 把生成的内核模块拷贝到共享文件系统
  加载内核模块

insmod kernel_module.ko

查看内核打印

dmesg

/sys/module/ 目录下会生成kernel_module文件夹
/proc/modules”节点可以查看当前系统加载的内核模块
卸载内核模块

rmmod kernel_module