VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToPAE32_16.asm@ 59955

Last change on this file since 59955 was 59934, checked in by vboxsync, 9 years ago

bs3kit: Added missing bs3-mode-SwitchTo*_Weird.asm files and some fixes to the other switching stuff.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.4 KB
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1; $Id: bs3-mode-SwitchToPAE32_16.asm 59934 2016-03-04 20:32:23Z vboxsync $
2;; @file
3; BS3Kit - Bs3SwitchToPAE32_16
4;
5
6;
7; Copyright (C) 2007-2016 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "bs3kit-template-header.mac"
28
29
30;;
31; Switch to 16-bit code under 32-bit PAE paged protected mode sys/tss from any other mode.
32;
33; @cproto BS3_DECL(void) Bs3SwitchToPAE32_16(void);
34;
35; @uses Nothing (except high 32-bit register parts).
36;
37; @remarks Obviously returns to 16-bit mode, even if the caller was
38; in 32-bit or 64-bit mode.
39;
40; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
41;
42BS3_PROC_BEGIN_MODE Bs3SwitchToPAE32_16
43%if TMPL_MODE == BS3_MODE_PAE32_16
44 ret
45
46%elif TMPL_MODE == BS3_MODE_PAE32
47 extern BS3_CMN_NM(Bs3SwitchTo32Bit)
48 jmp BS3_CMN_NM(Bs3SwitchTo32Bit)
49
50%else
51 ;
52 ; Switch to PAE32.
53 ;
54 extern TMPL_NM(Bs3SwitchToPAE32)
55 call TMPL_NM(Bs3SwitchToPAE32)
56 BS3_SET_BITS 32
57
58 ;
59 ; Make sure we're in the 16-bit segment and then do the switch to 16-bit.
60 ;
61 %if TMPL_BITS != 16
62 jmp .sixteen_bit_segment
63BS3_BEGIN_TEXT16
64 BS3_SET_BITS TMPL_BITS
65.sixteen_bit_segment:
66 %endif
67 extern _Bs3SwitchTo16Bit_c32
68 %if TMPL_BITS == 32
69 jmp _Bs3SwitchTo16Bit_c32
70 %else
71 call _Bs3SwitchTo16Bit_c32
72 BS3_SET_BITS 16
73 %if TMPL_BITS == 16
74 ret
75 %else
76 ret 6 ; Return and pop 6 bytes of "parameters" (unused return address).
77 %endif
78 %endif
79%endif
80BS3_PROC_END_MODE Bs3SwitchToPAE32_16
81
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