diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintChr.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintChr.asm | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintChr.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintChr.asm new file mode 100644 index 00000000..4099a967 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PrintChr.asm @@ -0,0 +1,115 @@ +; $Id: bs3-cmn-PrintChr.asm $ +;; @file +; BS3Kit - Bs3PrintChr. +; + +; +; Copyright (C) 2007-2022 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 + |