用qemu模拟i386的linux内核，用于内核学习

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安装
apt-get install qemu

下载http://kernel.org/ 这里也测试过4.5版本，但是无法启动
wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.7.4.tar.bz2
tar xvf linux-3.7.4.tar.bz2
cd linux-3.7.4.tar.bz2

编译内核

ls arch/x86/configs/
make i386_defconfig
make menuconfig
# compile whith the kernel parameter
# General Setup –> Initial RAM filesystem and RAM disk support
# Device Drivers –> Block Devices –> RAM block device support
make -j 2

用hello world 测试
#include <stdio.h>
#include <unistd.h>
int main(void)
{
while(1){
printf("hello,world\n");
usleep(1000000);
}
return 0;
}

编译
gcc -static -o init init.c

制作磁盘
dd if=/dev/zero of=ramdisk.img bs=1M count=4

格式化
mkfs.ext2 ramdisk.img

挂载磁盘
sudo mount -o loop ramdisk.img rootfs
sudo cp init rootfs
sudo mkdir rootfs/dev
sudo mknod rootfs/dev/console c 5 1
sudo mknod rootfs/dev/ram b 1 0
sudo umount rootfs

启动qemu，我的ubuntu系统是64位
qemu-system-x86_64 -kernel arch/x86/boot/bzImage -initrd ../qemu-i386/ramdisk.img -append "root=/dev/ram init=/init"

用busybox制作，注意哪个王好像无法下载，可以到国内一些网站下载，下面命令执行也要注意目录位置，
所有make命令都是源码目录进行，for i in {1..4} ; do sudo mknod dev/tty$i c 4 $i; done;在挂载目录执行，其他的看平时了

wget http://www.busybox.net/downloads/busybox-1.21.0.tar.bz2
tar xvf busybox-1.21.0.tar.bz2
cd busybox-1.21.0
make menuconfig # This creates a file called ".config"
# Busybox Settings --->Build Options --->[*] Build BusyBox as a static binary (no shared libs)
make -j 2 # This creates the "busybox" executable
sudo mount -o loop ramdisk.img rootfs # mount it again
sudo rm rootfs/init # delete the init program
sudo make CONFIG_PREFIX=Path-to/rootfs install
#make install # or make CONFIG_PREFIX=/path/from/root install
for i in {1..4} ; do sudo mknod dev/tty$i c 4 $i; done;
# to fix the the /dev/tty? no found
sudo umount rootfs

动命令
qemu-system-x86_64 -kernel arch/x86/boot/bzImage -initrd ../qemu-i386/ramdisk.img -append "root=/dev/ram init=/linuxrc"

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