bootload(simple sector) asm

[BITS 16]
[ORG 0x7C00]

bootload_main:
    mov si, HelloWorld
    call printk

    call loadSector

    cli
    hlt

printk:
    lodsb
    or al, al
    jz .done
    mov ah, 0x0E
    int 0x10
    jmp printk
.done
    ret

loadSector:
    mov ah, 0x01
    int 0x13
    jnz loadSector ; loop if an error occured (or not ready, shouldn't happen under qemu)
    ; for the values below I've played around with 1's and 0's trying to
    ; guess to see if I can get it to work without some conversion function
    mov ah, 0x02 ; read sector
    mov al, 1
    mov ch, 1 ; track
    mov cl, 1 ; sector
    mov dh, 1 ; head
    mov dl, 0x80 ; read from first hd
    mov bx, 0x7E00
    cmp al, 0x00
    je .successful
    mov si, LoadSectorUnsuccessful
    call printk
    ret
.successful
    mov si, LoadSectorSuccessful
    call printk
    ret


HelloWorld db 'Hello, World!', 13, 10, 0
LoadSectorSuccessful db 'Loaded Sector Successfully!', 13, 10, 0
LoadSectorUnsuccessful db 'Unsuccessful Sector load :(', 13, 10, 0

times 510-($-$$) db 0
dw 0xAA55

times 512 db 0