;=----------------------------------------------------------------------------=;
;                            GNU GPL OS/K                                      ;
;                                                                              ;
;   Desc:   Basic realmode terminal 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 16]

disable_cursor:
    pushf
    push eax
    push edx
    mov dx, 0x3D4
    mov al, 0xA                             ; low cursor shape register
    out dx, al
    inc dx
    mov al, 0x20                            ; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
    out dx, al
    pop edx
    pop eax
    popf
    ret

get_dimensions:
    push eax
    push ebx
    mov ah, 0x0F
    int 0x10
    mov [VGA_HEIGHT], ah
    mov [VIDEO_MODE], al
    pop ebx
    pop eax
    ret

PrintB:
;---------------------------------------------------;
; Print out a simple string.                        ;
;                                                   ;
; DS:SI = String to print                           ;
;                                                   ;
; Returns: None                                     ;
;                                                   ;
;---------------------------------------------------;
    lodsb                                       ; Load byte from ds:si to al
    or al, al                                   ; If al is empty stop looping
    jz .done                                    ; Done looping and return
    mov ah, 0x0e                                ; Teletype output
    int 0x10                                    ; Video interupt
    jmp PrintB                                  ; Loop untill string is null
    .done:
    ret