bryoboot2.asm

; ---------------------------[bryoboot2.asm]--------------------
; 1. constants
; 2. directives
; 3. main
; 4. functions
; 5. messages
; 6. footer


; ---------------------------[CONSTANTS]------------------------
BL2_ADDR equ 0x7fee         ; origin address of loader2


CR equ 0x0d                 ; Carriage Return
LF equ 0x0a                 ; Line feed/ Newline

;----------------------------[DIRECTIVES]------------------------
org BL2_ADDR                ; origin
bits 16                     ; real mode 16 bit


;----------------------------[MAIN]------------------------------
main:
    ; Segmentation registers setup
    xor ax,ax
    mov ds,ax
    mov es,ax
    mov ss,ax

    ; Printing Initial Boot message
    mov si,initial_boot_msg
    call print

    jmp $


;----------------------------[FUNCTIONS]--------------------------

print:
    .loop:
        lodsb
        or al,al
        jz .break
        mov ah,0x0e
        int 0x10
        jmp .loop

    .break:
        ret



;-----------------------------[MESSAGES]--------------------------
initial_boot_msg:
     db '[BL2] BRYOBOOT2 loaded sucessfully',CR,LF,0


;-----------------------------[FOOTER]----------------------------
times 512-($-$$) db 0        ; Padding to 512 bytes