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mcpiromanmcpiroman
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‎.gitignore‎

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bin/

‎build.bat‎

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@echo off
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@set path=C:\Program Files\NASM;%path%
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mkdir bin
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@echo on
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nasm -f bin -w-other -o bin\main.bin main.nasm
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nasm -f bin -o bin\loader.bin loader.nasm
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@echo off
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echo.
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copy /b bin\loader.bin+bin\main.bin bin\out.img

‎commonSubroutines.nasm‎

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; args: al = char, bl = attibute, bh = page, dl = cursor x, dh = cursor y
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; invalidates: ah, cx
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printChar:
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mov cx, 1
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mov ah, 2
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int 10h
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mov ah, 9
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int 10h
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inc dl
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ret
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; args: ax = address to string, bl = attibute, bh = page, dl = cursor x, dh = cursor y
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; invalidates: ax, cx, si
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printString:
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mov si, ax
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mov cx, 1
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.loop:
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mov al, [si]
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test al, al
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jz .end
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mov ah, 2
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int 10h
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mov ah, 9
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int 10h
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inc dl
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inc si
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jmp .loop
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.end:
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ret
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; args: al = number to print, bl = attibute, bh = page, dl = cursor x, dh = cursor y
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; invalidates: ax, cx
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printNumDec:
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test al, al
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jnz .print_ax
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push ax
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mov al, '0'
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mov ah, 2
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int 10h
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mov cx, 1
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mov ah, 9
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int 10h
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inc dl
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pop ax
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ret
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.print_ax:
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push ax
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push cx
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mov ah, 0
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cmp ax, 0
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je .pn_done
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mov cl, 10
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div cl
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call .print_ax
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mov al, ah
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add al, 30h
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mov ah, 2
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int 10h
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push cx
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mov cx, 1
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mov ah, 9
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int 10h
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pop cx
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inc dl
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.pn_done:
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pop cx
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pop ax
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ret
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; args: ax = number to print, bl = attibute, bh = page, dl = cursor x, dh = cursor y
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printNumHex:
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push cx
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push si
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mov cx, ax
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rol cx, 4
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mov si, 3
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.loop:
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mov ah, 2
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int 10h
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mov al, cl
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and al, 0Fh
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cmp al, 10
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jns .letter
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add al, '0'
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jmp .print
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.letter:
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add al, ('A' - 10)
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.print:
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mov ah, 9
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push cx
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mov cx, 1
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int 10h
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pop cx
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rol cx, 4
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inc dl
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dec si
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jns .loop
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pop si
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pop cx
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ret

‎loader.nasm‎

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org 7C00h
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bits 16
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cpu 386
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jmp short Start
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db "FlopBird" ; OEM String
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dw 0x200 ; bytes per sector
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db 1 ; sectors per cluster
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dw 1 ; ;of reserved sectors
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db 2 ; ;of FAT copies
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dw 224 ; size of root directory
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dw 2880 ; total # of sectors if over 32 MB
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db 0xF0 ; media Descriptor
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dw 9 ; size of each FAT
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dw 9 ; sectors per track
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dw 2 ; number of read-write heads
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dd 0 ; number of hidden sectors
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dd 0 ; ; sectors for over 32 MB
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db 0 ; holds drive that the boot sector came from
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db 0 ; reserved, empty
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db 0x29 ; extended boot sector signature
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db "seri" ; disk serial
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db "Floppy Bird" ; volume label
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db "FAT16 " ; file system type
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%define STACK_BASE_ADDR 1000h
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%define PROGRAM_LOAD_ADDR 1000h
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%define SEGMENTS_TO_LOAD 4
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startMsg db "Starting loader", 0
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jumpingToProgramMsg db "Jumping to program..", 0
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programLoadFailedMsg db "Program load failed", 0
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currentDrive db 0
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Start:
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jmp 0000:Start2
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Start2:
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cli
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xor ax, ax
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mov ss, ax
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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sti
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cld
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mov [currentDrive], dl
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mov bp, STACK_BASE_ADDR
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mov sp, STACK_BASE_ADDR
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mov bh, al ; page 0
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mov bl, 0Fh ; color 15 (white)
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mov dl, al ; DL - cursor x
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mov dh, al ; DH - cursor y
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mov ax, startMsg
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call printString
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push bx
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push dx
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mov ah, 2
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mov al, SEGMENTS_TO_LOAD
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xor ch, ch
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mov cl, 2
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xor dh, dh
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mov dl, [currentDrive]
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mov bx, PROGRAM_LOAD_ADDR
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int 0x13
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pop dx
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pop bx
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jc short LoadFailature
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inc dh
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xor dl, dl
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mov ax, jumpingToProgramMsg
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call printString
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inc dh
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mov dl, [currentDrive]
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; dh - cursor y
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jmp PROGRAM_LOAD_ADDR
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LoadFailature:
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inc dh
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xor dl, dl
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mov ax, programLoadFailedMsg
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call printString
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IdleLoop:
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hlt
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jmp IdleLoop
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%include "commonSubroutines.nasm"
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times 0200h - 2 - ($ - $$) db 0 ; zerofill up to 510 bytes
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dw 0AA55h ; Boot Sector signature

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