VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToLM64.asm@ 61394

Last change on this file since 61394 was 60578, checked in by vboxsync, 9 years ago

bs3kit: made it easier to move 16-bit templated C code to other segments.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.4 KB
Line 
1; $Id: bs3-mode-SwitchToLM64.asm 60578 2016-04-19 15:26:34Z vboxsync $
2;; @file
3; BS3Kit - Bs3SwitchToLM64
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 64-bit long mode from any other mode.
32;
33; @cproto BS3_DECL(void) Bs3SwitchToLM64(void);
34;
35; @uses Nothing (except possibly high 32-bit and/or upper 64-bit register parts).
36;
37; @remarks Obviously returns to 64-bit mode, even if the caller was in 16-bit
38; or 32-bit mode. It doesn't not preserve the callers ring, but
39; instead changes to ring-0.
40;
41; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
42;
43BS3_GLOBAL_NAME_EX TMPL_NM(Bs3SwitchToLM64_Safe), function, 0
44BS3_PROC_BEGIN_MODE Bs3SwitchToLM64, BS3_PBC_NEAR
45%ifdef TMPL_LM64
46 ret
47
48%elifdef TMPL_CMN_LM
49 ;
50 ; Already in long mode, just switch to 64-bit.
51 ;
52 extern BS3_CMN_NM(Bs3SwitchTo64Bit)
53 jmp BS3_CMN_NM(Bs3SwitchTo64Bit)
54
55%else
56 ;
57 ; Switch to LM32 and then switch to 64-bits (IDT & TSS are the same for
58 ; LM16, LM32 and LM64, unlike the rest).
59 ;
60 ; (The long mode switching code is going via 32-bit protected mode, so
61 ; Bs3SwitchToLM32 contains the actual code for switching to avoid
62 ; unnecessary 32-bit -> 64-bit -> 32-bit trips.)
63 ;
64 %ifdef TMPL_16BIT
65 and esp, 0ffffh
66 push word [esp] ; copy return address.
67 and word [esp + 2], 0 ; clear upper return address
68 add dword [esp], BS3_ADDR_BS3TEXT16 ; Add base of return segment, completing 32-bit conversion.
69 %endif
70 extern TMPL_NM(Bs3SwitchToLM32)
71 call TMPL_NM(Bs3SwitchToLM32)
72 BS3_SET_BITS 32
73
74 extern _Bs3SwitchTo64Bit_c32
75 jmp _Bs3SwitchTo64Bit_c32
76%endif
77BS3_PROC_END_MODE Bs3SwitchToLM64
78
79
80%if TMPL_BITS == 16
81;;
82; Custom far stub.
83BS3_BEGIN_TEXT16_FARSTUBS
84BS3_PROC_BEGIN_MODE Bs3SwitchToLM64, BS3_PBC_FAR
85 inc bp
86 push bp
87 mov bp, sp
88
89 ; Call the real thing.
90 call TMPL_NM(Bs3SwitchToLM64)
91 BS3_SET_BITS 64
92
93 ; Jmp to common code for the tedious conversion.
94 %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
95 extern _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c64
96 jmp _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c64
97 %else
98 extern _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c64
99 jmp _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c64
100 %endif
101 BS3_SET_BITS 16
102BS3_PROC_END_MODE Bs3SwitchToLM64
103%endif
104
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