在linux debian系统上写个hello world版的bootloader

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根据http://viralpatel.net/taj/tutorial/hello_world_bootloader.php这篇文章来做的。

准备:

nasm

qemu

安装nasm和qemu：

sudo apt-get install nasm

sudo apt-get install qemu

编写bootloader文件，命名为mybootloader.asm：

[BITS 16];Tells the assembler that its a 16 bit code[ORG 0x7C00];Origin, tell the assembler that where the code will;be in memory after it is been loadedMOV SI, HelloString ;Store string pointer to SICALL PrintString;Call print string procedureJMP $ ;Infinite loop, hang it here.PrintCharacter:;Procedure to print character on screen;Assume that ASCII value is in register ALMOV AH, 0x0E;Tell BIOS that we need to print one charater on screen.MOV BH, 0x00;Page no.MOV BL, 0x07;Text attribute 0x07 is lightgrey font on black backgroundINT 0x10;Call video interruptRET;Return to calling procedurePrintString:;Procedure to print string on screen;Assume that string starting pointer is in register SInext_character:;Lable to fetch next character from stringMOV AL, [SI];Get a byte from string and store in AL registerINC SI;Increment SI pointerOR AL, AL;Check if value in AL is zero (end of string)JZ exit_function ;If end then returnCALL PrintCharacter ;Else print the character which is in AL registerJMP next_character;Fetch next character from stringexit_function:;End labelRET;Return from procedure;DataHelloString db 'Hello World', 0;HelloWorld string ending with 0TIMES 510 - ($ - $$) db 0;Fill the rest of sector with 0DW 0xAA55;Add boot signature at the end of bootloader

编译mybootloader.asm:

nasm mybootloader.asm -f bin -o boot.bin

运行qemu, 加载bootloader:

qemu-system-i386 boot.bin

结果如图：

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