boot_sec.asm

;
;  boot_sec.s
;  HADES OS
;
;  Created by Aung Khant Min on 7/14/18.
;
[bits 16]
[org 0x7c00]
KERNEL_OFFSET equ 0x1000


xor ax, ax
mov ds, ax
mov es, ax
mov [BOOT_DRIVE], dl
mov ax,0x07E
cli
mov ss, ax
mov sp, 0x1200
sti



mov bx, MSG_REAL_MODE
call print

call load_kernel

call switch_to_pm

jmp $

%include "./rm/print_func.asm"
%include "./rm/disk_load.s"
%include "./pm/global_descriptor_table.asm"
%include "./pm/print_string_pm.asm"
%include "./pm/swith_to_pm.asm"

[bits 16]

load_kernel:
    mov bx, LOAD_KERNEL_MSG
    call print

    mov bx, KERNEL_OFFSET
    mov dh, 15
    mov dl, [BOOT_DRIVE]
    call disk_load
    ret

[bits 32]

BEGIN_PM:
    mov ebx, MSG_PROT_MODE
    call print_string_pm

    call KERNEL_OFFSET
    jmp $


BOOT_DRIVE db 0
SECTORS db 0
MSG_REAL_MODE db "Started in 16-bit Real Mode.", 0
LOAD_KERNEL_MSG db "Loading kernel into memory.", 0
MSG_PROT_MODE db "Successfully landed in 32-bit Protected Mode", 0

times 510-($-$$) db 0
dw 0xaa55

;times 15*256 dw 0xDADA