VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToPAE16_32.asm@ 61533

Last change on this file since 61533 was 60557, checked in by vboxsync, 9 years ago

bs3kit: move real mode version of Bs3TestDoModes out of the default 16-bit code segment.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.1 KB
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1; $Id: bs3-mode-SwitchToPAE16_32.asm 60557 2016-04-19 03:01:35Z vboxsync $
2;; @file
3; BS3Kit - Bs3SwitchToPAE16_32
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 32-bit code under 16-bit PAE paged protected mode sys/tss from any other mode.
32;
33; @cproto BS3_DECL(void) Bs3SwitchToPE16_32(void);
34;
35; @uses Nothing (except high 32-bit register parts).
36;
37; @remarks Obviously returns to 32-bit mode, even if the caller was
38; in 16-bit or 64-bit mode.
39;
40; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
41;
42BS3_GLOBAL_NAME_EX TMPL_NM(Bs3SwitchToPAE16_32_Safe), function, 0
43BS3_PROC_BEGIN_MODE Bs3SwitchToPAE16_32, BS3_PBC_NEAR
44%ifdef TMPL_PAE16_32
45 ret
46
47%else
48 ;
49 ; Make sure we're in the 16-bit segment and then call Bs3SwitchToPAE16.
50 ;
51 %if TMPL_BITS != 16
52 jmp .sixteen_bit_segment
53BS3_BEGIN_TEXT16
54 BS3_SET_BITS TMPL_BITS
55.sixteen_bit_segment:
56 %endif
57 extern TMPL_NM(Bs3SwitchToPAE16)
58 call TMPL_NM(Bs3SwitchToPAE16)
59 BS3_SET_BITS 16
60
61 ;
62 ; Switch to 32-bit mode.
63 ;
64 extern _Bs3SwitchTo32Bit_c16
65 %if TMPL_BITS == 16
66 jmp _Bs3SwitchTo32Bit_c16
67 %else
68 call _Bs3SwitchTo32Bit_c16
69 BS3_SET_BITS 32
70 %if TMPL_BITS == 32
71 ret
72 %else
73 ret 4 ; Return and pop 4 bytes of "parameters" (unused return address).
74 %endif
75 %endif
76%endif
77BS3_PROC_END_MODE Bs3SwitchToPAE16_32
78
79
80%if TMPL_BITS == 16
81;;
82; Custom far stub.
83BS3_BEGIN_TEXT16_FARSTUBS
84BS3_PROC_BEGIN_MODE Bs3SwitchToPAE16_32, BS3_PBC_FAR
85 inc bp
86 push bp
87 mov bp, sp
88
89 ; Call the real thing.
90 call TMPL_NM(Bs3SwitchToPAE16_32)
91 BS3_SET_BITS 32
92
93 ; Jmp to common code for the tedious conversion.
94 %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
95 extern _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c32
96 jmp _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c32
97 %else
98 extern _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c32
99 jmp _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c32
100 %endif
101 BS3_SET_BITS 16
102BS3_PROC_END_MODE Bs3SwitchToPAE16_32
103%endif
104
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