diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-KbdRead.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-KbdRead.asm | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-KbdRead.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-KbdRead.asm new file mode 100644 index 00000000..de74bdef --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-KbdRead.asm @@ -0,0 +1,75 @@ +; $Id: bs3-cmn-KbdRead.asm $ +;; @file +; BS3Kit - Bs3KbdRead. +; + +; +; 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 +; + +%include "bs3kit-template-header.mac" + + +;; +; Sends a read command to the keyboard controller and gets the result. +; +; The caller is responsible for making sure the keyboard controller is ready +; for a command (call Bs3KbdWait if unsure). +; +; @returns The value read is returned (in al). +; @param bCmd The read command. +; @uses al (obviously) +; +; @cproto BS3_DECL(uint8_t) Bs3KbdRead_c16(uint8_t bCmd); +; +BS3_PROC_BEGIN_CMN Bs3KbdRead, BS3_PBC_NEAR + push xBP + mov xBP, xSP + + mov al, [xBP + xCB*2] + out 64h, al ; Write the command. + +.check_status: + in al, 64h + test al, 1 ; KBD_STAT_OBF + jz .check_status + + in al, 60h ; Read the data. + + pop xBP + BS3_HYBRID_RET +BS3_PROC_END_CMN Bs3KbdRead + +; +; We may be using the near code in some critical code paths, so don't +; penalize it. +; +BS3_CMN_FAR_STUB Bs3KbdRead, 2 + |