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path: root/boot0/mbr.asm
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; stage 1
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

[bits 16]

[org 0x7c00]

jmp stage1

STR_1:
    db "Starting Fool Loader Stage 1. v0.1",0

STR_2:
    db "Starting Stage 2",0

BOOT_DRIVE:
    db 0xff ; remember the bootdrive here

%include "boot/print_string_16.asm"
%include "boot0/disk_load_16.asm"

stage1:

    ;first of allsetup the stack (Right under mbr)
    ;guaranteed ~30KB space
    mov bp,0x07bff
    mov sp,bp
    
    ;remember BOOT_DRIVE (as was set by BIOS)
    mov [BOOT_DRIVE],dl	

    mov bx, STR_1
    call print_string
    call print_nextline

    call disk_load_16	; loads stage 2

    mov bx, STR_2
    call print_string
    call print_nextline
    jmp 0x7e00 ; jump to next sector where we put stage 2

;fill partition table (4x16byte) with zeroes. 
;(otherwise my Acer Aspire will not boot)
times 64 db 0x0

;so we get identified as MBR
times 510-($-$$) db 0x0
;dw 0x0
dw 0xaa55