;=----------------------------------------------------------------------------=;
;                            GNU GPL OS/K                                      ;
;                                                                              ;
;   Authors: spectral`                                                         ;
;            NeoX                                                              ;
;                                                                              ;
;   Desc:   Basic Memory Long mode Functions                                   ;
;                   (x86_64 architecture only)                                 ;
;=----------------------------------------------------------------------------=;
[BITS 64]

;; GLOBAL DATA
A20_OK          db  0

;; TEXT

check_a20:
    cmp BYTE [A20_OK], 1
    je .A20Success
    mov bl, 0x0C
    mov esi, Fail
    call write
    jmp Die
.A20Success:
    mov bl, 0x0A
    mov esi, Pass
    call write
    ret