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Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestNow.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestNow.asm | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestNow.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestNow.asm new file mode 100644 index 00000000..c5ab98fe --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestNow.asm @@ -0,0 +1,113 @@ +; $Id: bs3-cmn-TestNow.asm $ +;; @file +; BS3Kit - Bs3TestNow. +; + +; +; 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" +%include "VBox/VMMDevTesting.mac" + +BS3_EXTERN_DATA16 g_fbBs3VMMDevTesting +TMPL_BEGIN_TEXT + +;; +; @cproto BS3_DECL(uint64_t) Bs3TestNow(void); +; +; @uses eflags, return register(s) +; +BS3_PROC_BEGIN_CMN Bs3TestNow, BS3_PBC_HYBRID + BS3_CALL_CONV_PROLOG 0 + push xBP + mov xBP, xSP +%if __BITS__ == 16 +BONLY16 push sAX +%else + push xCX +BONLY64 push xDX +%endif + + cmp byte [BS3_DATA16_WRT(g_fbBs3VMMDevTesting)], 0 + je .no_vmmdev + + ; Read the lower timestamp. + mov dx, VMMDEV_TESTING_IOPORT_TS_LOW + in eax, dx +%if __BITS__ == 16 + mov bx, ax ; Save the first word in BX (returned in DX). + shr eax, 16 + mov cx, ax ; The second word is returned in CX. +%else + mov ecx, eax +%endif + + ; Read the high timestamp (latached in above read). + mov dx, VMMDEV_TESTING_IOPORT_TS_HIGH + in eax, dx +%if __BITS__ == 16 + mov dx, bx ; The first word is returned in DX. + mov bx, ax ; The third word is returned in BX. + shr eax, 16 ; The fourth word is returned in AX. +%elif __BITS__ == 32 + mov edx, eax + mov eax, ecx +%else + shl rax, 32 + or rax, rcx +%endif + +.return: +%if __BITS__ == 16 + mov [bp - sCB], ax ; Update the AX part of the saved EAX. + pop sAX +%else + pop xCX +BONLY64 pop xDX +%endif + pop xBP + BS3_CALL_CONV_EPILOG 0 + BS3_HYBRID_RET + +.no_vmmdev: + ; No fallback, just zero the result. +%if __BITS__ == 16 + xor ax, ax + xor bx, bx + xor cx, cx + xor dx, dx +%else + xor eax, eax +BONLY32 xor edx, edx +%endif + jmp .return +BS3_PROC_END_CMN Bs3TestNow + |