ibis-os/main.asm

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NASM
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; Bootloader
%include "boot.asm"
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section KERNEL follows=BOOTSECTOR vstart=1000h
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%macro mod 2
push ax
push cx
mov cx, %2
xor dx, dx
mov ax, %1
div cx
pop cx
pop ax
%endmacro
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main:
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mov ax, 0x0013
int 0x10
mov cx, 50 ; x
mov al, 50 ; y
mov dx, 100 ; w
mov bl, 100 ; h
mov bh, 0x01 ; color = Dark blue
call gfx_rect
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jmp $ ; Halt
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; Libs
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%include "print_util.asm"
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%include "time_util.asm"
%include "gfx_util.asm"
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; Data
HELLO_WORLD:
db 'Hello, world! :D', 0