1 | ; $Id: bs3-mode-SwitchToLM64.asm 106061 2024-09-16 14:03:52Z vboxsync $
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2 | ;; @file
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3 | ; BS3Kit - Bs3SwitchToLM64
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2007-2024 Oracle and/or its affiliates.
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8 | ;
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9 | ; This file is part of VirtualBox base platform packages, as
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10 | ; available from https://www.virtualbox.org.
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11 | ;
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12 | ; This program is free software; you can redistribute it and/or
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13 | ; modify it under the terms of the GNU General Public License
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14 | ; as published by the Free Software Foundation, in version 3 of the
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15 | ; License.
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16 | ;
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17 | ; This program is distributed in the hope that it will be useful, but
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18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | ; General Public License for more details.
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21 | ;
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22 | ; You should have received a copy of the GNU General Public License
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23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | ;
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25 | ; The contents of this file may alternatively be used under the terms
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26 | ; of the Common Development and Distribution License Version 1.0
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27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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28 | ; in the VirtualBox distribution, in which case the provisions of the
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29 | ; CDDL are applicable instead of those of the GPL.
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30 | ;
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31 | ; You may elect to license modified versions of this file under the
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32 | ; terms and conditions of either the GPL or the CDDL or both.
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33 | ;
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34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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35 | ;
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36 |
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37 | %include "bs3kit-template-header.mac"
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38 |
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39 |
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40 | ;;
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41 | ; Switch to 64-bit long mode from any other mode.
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42 | ;
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43 | ; @cproto BS3_DECL(void) Bs3SwitchToLM64(void);
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44 | ;
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45 | ; @uses Nothing (except possibly high 32-bit and/or upper 64-bit register parts).
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46 | ;
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47 | ; @remarks Obviously returns to 64-bit mode, even if the caller was in 16-bit
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48 | ; or 32-bit mode. It doesn't not preserve the callers ring, but
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49 | ; instead changes to ring-0.
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50 | ;
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51 | ; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
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52 | ;
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53 | BS3_GLOBAL_NAME_EX TMPL_NM(Bs3SwitchToLM64_Safe), function, 0
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54 | BS3_PROC_BEGIN_MODE Bs3SwitchToLM64, BS3_PBC_NEAR
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55 | %ifdef TMPL_LM64
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56 | ret
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57 |
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58 | %elifdef TMPL_CMN_LM
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59 | ;
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60 | ; Already in long mode, just switch to 64-bit.
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61 | ;
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62 | extern BS3_CMN_NM(Bs3SwitchTo64Bit)
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63 | jmp BS3_CMN_NM(Bs3SwitchTo64Bit)
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64 |
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65 | %else
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66 | ;
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67 | ; Switch to LM32 and then switch to 64-bits (IDT & TSS are the same for
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68 | ; LM16, LM32 and LM64, unlike the rest).
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69 | ;
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70 | ; (The long mode switching code is going via 32-bit protected mode, so
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71 | ; Bs3SwitchToLM32 contains the actual code for switching to avoid
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72 | ; unnecessary 32-bit -> 64-bit -> 32-bit trips.)
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73 | ;
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74 | %ifdef TMPL_16BIT
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75 | and esp, 0ffffh
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76 | push word [esp] ; copy return address.
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77 | and word [esp + 2], 0 ; clear upper return address
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78 | add dword [esp], BS3_ADDR_BS3TEXT16 ; Add base of return segment, completing 32-bit conversion.
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79 | %endif
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80 | extern TMPL_NM(Bs3SwitchToLM32)
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81 | call TMPL_NM(Bs3SwitchToLM32)
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82 | BS3_SET_BITS 32
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83 |
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84 | extern _Bs3SwitchTo64Bit_c32
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85 | jmp _Bs3SwitchTo64Bit_c32
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86 | %endif
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87 | BS3_PROC_END_MODE Bs3SwitchToLM64
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88 |
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89 |
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90 | %if TMPL_BITS == 16
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91 | ;;
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92 | ; Custom far stub.
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93 | BS3_BEGIN_TEXT16_FARSTUBS
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94 | BS3_PROC_BEGIN_MODE Bs3SwitchToLM64, BS3_PBC_FAR
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95 | inc bp
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96 | push bp
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97 | mov bp, sp
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98 |
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99 | ; Call the real thing.
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100 | call TMPL_NM(Bs3SwitchToLM64)
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101 | BS3_SET_BITS 64
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102 |
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103 | ; Jmp to common code for the tedious conversion.
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104 | %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
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105 | extern _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c64
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106 | jmp _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c64
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107 | %else
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108 | extern _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c64
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109 | jmp _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c64
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110 | %endif
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111 | BS3_SET_BITS 16
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112 | BS3_PROC_END_MODE Bs3SwitchToLM64
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113 | %endif
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114 |
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