自己动手写操作系统笔记1

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首先做好准备

下载好nasm(编译汇编器)，bochs(一个小型虚拟机)

bochs 的安装

tar vxzf bochs-x.x.x.tar.gz

cd bochs-x.x.x

./configure --enable-debugger --enable-disasm

make

sudo make install

boot.asm 的编写如下

org07c00h; 告诉编译器程序加载到7c00处movax, csmovds, axmoves, axcallDispStr; 调用显示字符串例程jmp$; 无限循环DispStr:movax, BootMessagemovbp, ax; ES:BP = 串地址movcx, 16; CX = 串长度movax, 01301h; AH = 13,  AL = 01hmovbx, 000ch; 页号为0(BH = 0) 黑底红字(BL = 0Ch,高亮)movdl, 0int10h; 10h 号中断retBootMessage:db"Hello, OS world!"times 510-($-$)db0; 填充剩下的空间，使生成的二进制代码恰好为512字节dw 0xaa55; 结束标志

用nasm编译 nasm boot.asm -o boot.bin

用bochs创建一个软盘镜像 bximage 选择fd

将引导写进软盘 dd if=boot.bin of=a.img bs=512 count=1 conv=notrunc

编写bochs配置文件bochsrc

################################################################ Configuration file for Bochs################################################################ how much memory the emulated machine will havemegs: 32# filename of ROM imagesromimage: file=/usr/local/share/bochs/BIOS-bochs-latestvgaromimage: file=/usr/local/share/bochs/VGABIOS-elpin-2.40# what disk images will be used floppya: 1_44=a.img, status=inserted# choose the boot disk.boot: floppy# where do we send log messages?log: bochsout.txt# disable the mousemouse: enabled=0# enable key mapping, using US layout as default.keyboard_mapping: enabled=1, map=/usr/local/share/bochs/keymaps/x11-pc-us.map

然后就可以运行了 bochs -f bochsrc