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boot2.asm
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boot2.asm
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org 0x500
jmp 0x0000:start
nabeluBIOS db 'Starting NabeluBios (version 0.5.2-05002011_040-oxe)',0
loading0 db 'Loading struct for the kernel...', 0
setting db 'Setting up protected mode...', 0
loading1 db 'Loading kernel in memory...', 0
running db 'Running kernel...', 0
press db 'Continue? PRESS ENTER'
inp times 5 db 0;reserva 5 bytes
start:
xor ax, ax
mov ds, ax
mov es, ax
mov ax, 0x7e0 ;0x7e0<<1 = 0x7e00 (início de kernel.asm)
mov es, ax
xor bx, bx ;posição es<<1+bx
;modo de grafico
mov ah,0
mov al, 12h
int 10h
;background
mov ah,0xb
mov bh,0
mov bl, 0 ; color
int 10h
;nao sei pra que serve
;mov ax, 0003h ;limpa a tela mantendo o modo texto
;int 10h
mov bl,0x2;color
mov bx, 0
mov si, nabeluBIOS
call printer
call pula
mov si, loading0
call printe
mov si, setting
call printe
mov si, loading1
call printe
mov si, running
call printe
call pula
call pula
mov si, press
call printer
mov di, inp
call inpute
jmp reset
reset:
mov ah, 00h ;reseta o controlador de disco
mov dl, 0 ;floppy disk
int 13h
jc reset ;se o acesso falhar, tenta novamente
jmp load
load:
mov ah, 02h ;lê um setor do disco
mov al, 20 ;quantidade de setores ocupados pelo kernel
mov ch, 0 ;track 0
mov cl, 3 ;sector 3
mov dh, 0 ;head 0
mov dl, 0 ;drive 0
int 13h
jc load ;se o acesso falhar, tenta novamente
jmp 0x7e00 ;pula para o setor de endereco 0x7e00 (start do boot2)
;--------------------------
printer:
lodsb
cmp al,0
je doner
mov ah, 0eh
mov bl, 0x2 ; define a cor como verde de acordo com o Bios color attributes
int 10h
jmp printer
doner:
mov ah, 0eh
mov al, 0xd
int 10h
mov al, 0xa
int 10h
ret
;------------------------
printe:
lodsb
cmp al,0
je done
mov ah, 0eh
mov bl, 0x2
int 10h
mov dx, 0
.delei: ;delay
inc dx
mov cx, 0
.time:
inc cx
cmp cx, 10000
jne .time
cmp dx, 1000
jne .delei
jmp printe
done:
mov ah, 0eh
mov al, 0xd
int 10h
mov al, 0xa
int 10h
ret
;------------------
inpute:
;loop until stopped condition
mov ah, 0
int 16h
stosb
;0xa == /n , Line Feed
cmp al, 0xd ; byte value exceeds bounds??
je .returne
jmp inpute
.returne:
ret
;--------------------
pula:
mov ah, 0eh
mov al, 0xd
int 10h
mov al, 0xa
int 10h
mov ah, 0eh
mov al, 0xd
int 10h
mov al, 0xa
int 10h
ret