1 | ; $Id: bs3-mode-SwitchToPE32.asm 60557 2016-04-19 03:01:35Z vboxsync $
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2 | ;; @file
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3 | ; BS3Kit - Bs3SwitchToPE32
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2007-2015 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 | ; The contents of this file may alternatively be used under the terms
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18 | ; of the Common Development and Distribution License Version 1.0
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19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | ; VirtualBox OSE distribution, in which case the provisions of the
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21 | ; CDDL are applicable instead of those of the GPL.
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22 | ;
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23 | ; You may elect to license modified versions of this file under the
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24 | ; terms and conditions of either the GPL or the CDDL or both.
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25 | ;
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26 |
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27 | %include "bs3kit-template-header.mac"
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28 |
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29 |
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30 | ;;
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31 | ; Switch to 32-bit unpaged protected mode from any other mode.
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32 | ;
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33 | ; @cproto BS3_DECL(void) Bs3SwitchToPE32(void);
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34 | ;
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35 | ; @uses Nothing (except high 32-bit register parts), upper part of ESP is
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36 | ; cleared if caller is in 16-bit mode.
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37 | ;
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38 | ; @remarks Obviously returns to 32-bit mode, even if the caller was
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39 | ; in 16-bit or 64-bit mode.
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40 | ;
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41 | ; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
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42 | ;
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43 | BS3_GLOBAL_NAME_EX TMPL_NM(Bs3SwitchToPE32_Safe), function, 0
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44 | BS3_PROC_BEGIN_MODE Bs3SwitchToPE32, BS3_PBC_NEAR
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45 | %ifdef TMPL_PE32
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46 | ret
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47 |
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48 | %elif BS3_MODE_IS_V86(TMPL_MODE)
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49 | ;
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50 | ; V8086 - Switch to 16-bit ring-0 and call worker for that mode.
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51 | ;
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52 | extern BS3_CMN_NM(Bs3SwitchToRing0)
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53 | call BS3_CMN_NM(Bs3SwitchToRing0)
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54 | extern %[BS3_MODE_R0_NM_ %+ TMPL_MODE](Bs3SwitchToPE32)
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55 | jmp %[BS3_MODE_R0_NM_ %+ TMPL_MODE](Bs3SwitchToPE32)
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56 |
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57 | %else
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58 | ;
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59 | ; Switch to real mode.
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60 | ;
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61 | %if TMPL_BITS != 32
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62 | %if TMPL_BITS > 32
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63 | shl xPRE [xSP + xCB], 32 ; Adjust the return address from 64-bit to 32-bit.
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64 | add rsp, xCB - 4
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65 | %else
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66 | push word 0 ; Reserve space to expand the return address.
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67 | %endif
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68 | ; Must be in 16-bit segment when calling Bs3SwitchTo16Bit.
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69 | jmp .sixteen_bit_segment
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70 | BS3_BEGIN_TEXT16
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71 | BS3_SET_BITS TMPL_BITS
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72 | .sixteen_bit_segment:
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73 | %endif
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74 |
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75 | ;
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76 | ; Switch to real mode.
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77 | ;
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78 | extern TMPL_NM(Bs3SwitchToRM)
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79 | call TMPL_NM(Bs3SwitchToRM)
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80 | BS3_SET_BITS 16
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81 |
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82 | push eax
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83 | pushfd
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84 | cli
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85 |
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86 | ;
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87 | ; Load the GDT and enable PE32.
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88 | ;
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89 | BS3_EXTERN_SYSTEM16 Bs3Lgdt_Gdt
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90 | BS3_BEGIN_TEXT16
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91 | mov ax, BS3SYSTEM16
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92 | mov ds, ax
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93 | lgdt [Bs3Lgdt_Gdt]
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94 |
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95 | mov eax, cr0
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96 | or eax, X86_CR0_PE
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97 | mov cr0, eax
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98 | jmp BS3_SEL_R0_CS32:dword .thirty_two_bit wrt FLAT
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99 | BS3_BEGIN_TEXT32
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100 | .thirty_two_bit:
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101 |
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102 | ;
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103 | ; Convert the (now) real mode stack pointer to 32-bit flat.
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104 | ;
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105 | xor eax, eax
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106 | mov ax, ss
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107 | shl eax, 4
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108 | and esp, 0ffffh
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109 | add esp, eax
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110 |
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111 | mov ax, BS3_SEL_R0_SS32
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112 | mov ss, ax
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113 |
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114 | ;
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115 | ; Call rountine for doing mode specific setups.
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116 | ;
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117 | extern NAME(Bs3EnteredMode_pe32)
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118 | call NAME(Bs3EnteredMode_pe32)
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119 |
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120 | ;
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121 | ; Restore eax and flags (IF).
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122 | ;
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123 | %if TMPL_BITS < 32
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124 | and esp, 0ffffh ; Make sure the high word is zero.
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125 | movzx eax, word [esp + 8 + 2] ; Load return address.
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126 | add eax, BS3_ADDR_BS3TEXT16 ; Convert it to a flat address.
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127 | mov [esp + 8], eax ; Store it in the place right for 32-bit returns.
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128 | %endif
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129 | popfd
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130 | pop eax
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131 | ret
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132 |
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133 | %if TMPL_BITS != 32
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134 | TMPL_BEGIN_TEXT
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135 | %endif
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136 | %endif
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137 | BS3_PROC_END_MODE Bs3SwitchToPE32
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138 |
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139 |
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140 | %if TMPL_BITS == 16
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141 | ;;
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142 | ; Custom far stub.
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143 | BS3_BEGIN_TEXT16_FARSTUBS
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144 | BS3_PROC_BEGIN_MODE Bs3SwitchToPE32, BS3_PBC_FAR
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145 | inc bp
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146 | push bp
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147 | mov bp, sp
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148 |
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149 | ; Call the real thing.
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150 | call TMPL_NM(Bs3SwitchToPE32)
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151 | BS3_SET_BITS 32
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152 |
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153 | ; Jmp to common code for the tedious conversion.
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154 | %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
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155 | extern _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c32
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156 | jmp _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c32
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157 | %else
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158 | extern _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c32
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159 | jmp _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c32
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160 | %endif
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161 | BS3_SET_BITS 16
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162 | BS3_PROC_END_MODE Bs3SwitchToPE32
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163 | %endif
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164 |
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