; entry.asm: Entrypoint for the loader partition of the Nightloader.

; WARNING: Never import at the top of this file!
; If something has to be included, include it at the bottom!

STACK_SIZE          equ 32768
UPPER_STACK_POINTER equ 0x20000
LOWER_STACK_POINTER equ (UPPER_STACK_POINTER - STACK_SIZE)

bits 16
org 0xa000
stage_2_setup_entry:
    mov ebx, LOWER_STACK_POINTER
    mov ss, ebx
    mov esp, STACK_SIZE
    mov ebp, STACK_SIZE
    push dx
    cli

    mov ah, 0x00
    mov al, 0x03 ; 0x13 for graphics, 0x03 for text.
    int 0x10

.check_a20:
    push ebp
    mov ebp, esp
    call check_a20_wraparound
    mov esp, ebp
    pop ebp
    cmp eax, 1
    je .a20_is_enabled

    hlt

.a20_is_enabled:

    mov edi, ebp
    mov esi, esp
    push ebp
    mov ebp, esp
    ; push dword after_gdt_loaded
    call load_flat_gdt
    mov esp, ebp
    pop ebp

    cli
    hlt

; Utilities
; Memory Management
%include "memory/a20.asm"
%include "memory/gdt.asm"

bits 32
stage2_protected_entry:

    push ebp
    mov ebp, esp
    call setup_drivers
    mov esp, ebp
    pop ebp
    
    cli
    hlt

.buffer:
    dd 0

%include "utility/math.asm"
%include "utility/memory.asm"
%include "utility/display.asm"

; Driver Manager
 %include "drivers/manager.asm"