1 files changed, 104 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelFlatDataToRealMode.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelFlatDataToRealMode.asm
new file mode 100644
index 00000000..cb142e80
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelFlatDataToRealMode.asm
@@ -0,0 +1,104 @@
+; $Id: bs3-cmn-SelFlatDataToRealMode.asm $
+;; @file
+; BS3Kit - Bs3SelFlatDataToRealMode
+;
+
+;
+; 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
+;
+
+
+;*********************************************************************************************************************************
+;*      Header Files                                                                                                             *
+;*********************************************************************************************************************************
+%include "bs3kit-template-header.mac"
+
+
+;*********************************************************************************************************************************
+;*  External Symbols                                                                                                             *
+;*********************************************************************************************************************************
+%ifdef BS3_STRICT
+BS3_EXTERN_CMN Bs3Panic
+%endif
+TMPL_BEGIN_TEXT
+%if TMPL_BITS == 16
+CPU 8086
+%endif
+
+
+;;
+; @cproto   BS3_CMN_PROTO_NOSB(uint32_t, Bs3SelFlatDataToRealMode,(uint32_t uFlatAddr));
+;
+; @uses     Only return registers (ax:dx, eax, eax)
+; @remarks  No 20h scratch area requirements.
+;
+BS3_PROC_BEGIN_CMN Bs3SelFlatDataToRealMode, BS3_PBC_NEAR      ; Far stub generated by the makefile/bs3kit.h.
+        push    xBP
+        mov     xBP, xSP
+
+        ;
+        ; Take the simplest approach possible (64KB tiled).
+        ;
+%if TMPL_BITS == 16
+        mov     ax, cx                  ; save cx
+        mov     dx, [xBP + xCB + cbCurRetAddr + 2]
+ %ifdef BS3_STRICT
+        cmp     dx, _1M >> 16
+        jb      .address_ok
+        call    Bs3Panic
+.address_ok:
+ %endif
+        mov     cl, 12
+        shl     dx, cl
+        mov     ax, cx                  ; restore cx
+
+        mov     ax, [xBP + xCB + cbCurRetAddr]
+
+%else
+ %if TMPL_BITS == 32
+        mov     eax, [xBP + xCB + cbCurRetAddr]
+ %else
+        mov     rax, rcx
+ %endif
+ %ifdef BS3_STRICT
+        cmp     xAX, _1M
+        jb      .address_ok
+        call    Bs3Panic
+.address_ok:
+ %endif
+        ror     eax, 16
+        shl     ax, 12
+        rol     eax, 16
+%endif
+
+        pop     xBP
+        BS3_HYBRID_RET
+BS3_PROC_END_CMN   Bs3SelFlatDataToRealMode
+