1 files changed, 78 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestIsVmmDevTestingPresent.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestIsVmmDevTestingPresent.asm
new file mode 100644
index 00000000..5a158fde
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TestIsVmmDevTestingPresent.asm
@@ -0,0 +1,78 @@
+; $Id: bs3-cmn-TestIsVmmDevTestingPresent.asm $
+;; @file
+; BS3Kit - bs3TestIsVmmDevTestingPresent
+;
+
+;
+; 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
+;
+
+%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
+