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|
; $Id: bs3-cmn-PrintChr.asm $
;; @file
; BS3Kit - Bs3PrintChr.
;
;
; Copyright (C) 2007-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program 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, in version 3 of the
; License.
;
; This program 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 this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
%if TMPL_BITS == 16
BS3_EXTERN_DATA16 g_bBs3CurrentMode
%endif
BS3_EXTERN_CMN Bs3Syscall
TMPL_BEGIN_TEXT
;;
; @cproto BS3_DECL(void) Bs3PrintChr_c16(char ch);
;
BS3_PROC_BEGIN_CMN Bs3PrintChr, BS3_PBC_NEAR
BS3_CALL_CONV_PROLOG 1
push xBP
mov xBP, xSP
push xAX
push xCX
push xBX
%if TMPL_BITS == 16
; If we're in real mode or v8086 mode, call the VGA BIOS directly.
mov bl, [g_bBs3CurrentMode]
cmp bl, BS3_MODE_RM
je .do_vga_bios_call
%if 0
test bl, BS3_MODE_CODE_V86
jz .do_system_call
%else
jmp .do_system_call
%endif
.do_vga_bios_call:
mov al, [xBP + xCB*2] ; Load the char
cmp al, 0ah ; \n
je .newline
mov bx, 0ff00h
mov ah, 0eh
int 10h
jmp .return
.newline:
mov ax, 0e0dh ; cmd + '\r'.
mov bx, 0ff00h
int 10h
mov ax, 0e0ah ; cmd + '\n'.
mov bx, 0ff00h
int 10h
jmp .return
%endif
.do_system_call:
mov cl, [xBP + xCB*2] ; Load the char
mov ax, BS3_SYSCALL_PRINT_CHR
call Bs3Syscall ; near! no BS3_CALL!
.return:
pop xBX
pop xCX
pop xAX
pop xBP
BS3_CALL_CONV_EPILOG 1
ret
BS3_PROC_END_CMN Bs3PrintChr
;
; Generate 16-bit far stub.
; Peformance critical, so don't penalize near calls.
;
BS3_CMN_FAR_STUB Bs3PrintChr, 2
|
