os-70-350

os-70-350 Commit Details


Date:2013-12-01 23:05:58 (11 years 9 months ago)
Author:Natalie Adams
Branch:master
Commit:34376e6c59ff1bbf0e38dbc116ff34a15c7a07aa
Parents: 13dac6cafbedbadbeb6342f4439164ee211e1e06
Message:Adding first OS/bootloader
Changes:

File differences

yourfirstos/firstos.asm
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␉BITS 16␊
␊
start:␊
␉mov ax, 07C0h␉␉; Set up 4K stack space after this bootloader␊
␉add ax, 288␉␉; (4096 + 512) / 16 bytes per paragraph␊
␉mov ss, ax␊
␉mov sp, 4096␊
␊
␉mov ax, 07C0h␉␉; Set data segment to where we're loaded␊
␉mov ds, ax␊
␊
␊
␉mov si, text_string␉; Put string position into SI␊
␉call print_string␉; Call our string-printing routine␊
␊
␉jmp $␉␉␉; Jump here - infinite loop!␊
␊
␊
␉␊
text_string db 'This is my cool new Operating System!', 0␊
␊
print_string:␉␉␉; Routine: output string in SI to screen␊
␉mov ah, 0Eh␉␉; int 10h 'print char' function␊
␊
.repeat:␊
␉lodsb␉␉␉; Get character from string␊
␉cmp al, 0␊
␉je .done␉␉; If char is zero, end of string␊
␉int 10h␉␉␉; Otherwise, print it␊
␉jmp .repeat␊
␊
.done:␊
␉ret␊
␊
␊
␉times 510-($-$$) db 0␉; Pad remainder of boot sector with 0s␊
␉dw 0xAA55␉␉; The standard PC boot signature
yourfirstos/make-qemu.bat
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..\ext\nasm\nasm -f bin -o os.flp firstos.asm␍␊
..\ext\qemu\qemu-system-x86_64.exe -L ..\ext\qemu -m 128 -fda os.flp
yourfirstos/make-qemu.sh
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#!/bin/bash␍␊
␍␊
nasm -f bin -o os.flp firstos.asm␍␊
qemu-system-x86_64.exe -m 128 -fda os.flp
yourfirstos/make-vb.bat
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@echo off␊
set vboxmanage="C:\Program Files\Oracle\VirtualBox\vboxmanage.exe"␊
set vboxname=os1_%COMPUTERNAME%_%USERNAME%␊
..\ext\nasm\nasm -f bin -o os.img firstos.asm␊
%vboxmanage% unregistervm %vboxname% --delete 2> nul␊
%vboxmanage% createvm --name %vboxname% --basefolder %CD% --register␊
%vboxmanage% modifyvm %vboxname% --memory "256"␊
%vboxmanage% modifyvm %vboxname% --bioslogodisplaytime "1"␊
%vboxmanage% storagectl %vboxname% --name Floppy --add floppy --bootable on␊
%vboxmanage% storageattach %vboxname% --device 0 --storagectl Floppy --type fdd --medium %CD%\os.img␊
%vboxmanage% startvm %vboxname%␊
pause␊
%vboxmanage% controlvm %vboxname% poweroff␊
timeout /t 2 /nobreak > NUL␊
%vboxmanage% unregistervm %vboxname% --delete␊
yourfirstos/make-vb.sh
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#!/bin/bash␍␊
␍␊
vboxmanage=`which vboxmanage`␍␊
vboxname=os1_`hostname`_$USER␍␊
nasm -f bin -o os.img firstos.asm␍␊
$vboxmanage unregistervm $vboxname --delete 2> nul␍␊
$vboxmanage createvm --name $vboxname --basefolder $PWD --register␍␊
$vboxmanage modifyvm $vboxname --memory "256"␍␊
$vboxmanage modifyvm $vboxname --bioslogodisplaytime "1"␍␊
$vboxmanage storagectl $vboxname --name Floppy --add floppy --bootable on$PWD%CD%\os.img␍␊
$vboxmanage startvm $vboxname␍␊
pause␍␊
$vboxmanage controlvm $vboxname poweroff␍␊
timeout /t 2 /nobreak > NUL␍␊
$vboxmanage unregistervm $vboxname --delete

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