1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
; $Id: bs3-cmn-TestIsVmmDevTestingPresent.asm $
;; @file
; BS3Kit - bs3TestIsVmmDevTestingPresent
;
;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE 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.
;
%include "bs3kit-template-header.mac"
%include "VBox/VMMDevTesting.mac"
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
BS3_EXTERN_DATA16 g_uBs3CpuDetected
TMPL_BEGIN_TEXT
;;
; @cproto BS3_DECL(bool) bs3TestIsVmmDevTestingPresent_c16(void);
;
BS3_PROC_BEGIN_CMN bs3TestIsVmmDevTestingPresent, BS3_PBC_HYBRID_0_ARGS
BS3_CALL_CONV_PROLOG 2
push xBP
mov xBP, xSP
push xDX
; Check the response from the NOP port.
mov dx, VMMDEV_TESTING_IOPORT_NOP
cmp byte [g_uBs3CpuDetected], BS3CPU_80386
jb .ancient_cpu
in eax, dx
cmp eax, VMMDEV_TESTING_NOP_RET
.set_ax_and_return:
mov ax, 0
jne .return
mov ax, 1
.return:
pop xDX
pop xBP
BS3_CALL_CONV_EPILOG 2
BS3_HYBRID_RET
.ancient_cpu:
in ax, dx
cmp ax, (VMMDEV_TESTING_NOP_RET & 0xffff)
jmp .set_ax_and_return
BS3_PROC_END_CMN bs3TestIsVmmDevTestingPresent
|
