mirror of
https://gitlab.os-k.eu/os-k-team/os-k.git
synced 2023-08-25 14:03:10 +02:00
44 lines
2.1 KiB
NASM
44 lines
2.1 KiB
NASM
;=----------------------------------------------------------------------------=;
|
|
; GNU GPL OS/K ;
|
|
; ;
|
|
; Desc: Basic Memory Long mode Functions ;
|
|
; (x86_64 architecture only) ;
|
|
; ;
|
|
; ;
|
|
; Copyright © 2018-2019 The OS/K Team ;
|
|
; ;
|
|
; This file is part of OS/K. ;
|
|
; ;
|
|
; OS/K is free software: you can redistribute it and/or modify ;
|
|
; it under the terms of the GNU General Public License as published by ;
|
|
; the Free Software Foundation, either version 3 of the License, or ;
|
|
; (at your option) any later version. ;
|
|
; ;
|
|
; OS/K is distributed in the hope that it will be useful, ;
|
|
; but WITHOUT ANY WARRANTY; without even the implied warranty of ;
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;
|
|
; GNU General Public License for more details. ;
|
|
; ;
|
|
; You should have received a copy of the GNU General Public License ;
|
|
; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
|
|
;=----------------------------------------------------------------------------=;
|
|
[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
|