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|
; $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
|
