1 | ; $Id: bs3-mode-EnteredMode.asm 106061 2024-09-16 14:03:52Z vboxsync $
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2 | ;; @file
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3 | ; BS3Kit - Bs3EnteredMode
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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 | %if TMPL_BITS == 16
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40 | BS3_EXTERN_DATA16 g_uBs3CpuDetected
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41 | %endif
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42 | BS3_EXTERN_DATA16 g_bBs3CurrentMode
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43 | TMPL_BEGIN_TEXT
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44 |
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45 | ;;
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46 | ; @cproto BS3_DECL(void) Bs3EnteredMode(void);
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47 | ;
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48 | ; @uses Nothing.
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49 | ;
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50 | ; @remarks ASSUMES we're in ring-0 when not in some kind of real mode.
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51 | ;
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52 | BS3_PROC_BEGIN_MODE Bs3EnteredMode, BS3_PBC_NEAR ; won't need this outside the switchers, so always near.
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53 | push xBP
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54 | mov xBP, xSP
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55 | push xAX
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56 | push xCX
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57 | push xDX
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58 | TONLY16 push xBX
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59 | %if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
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60 | push r8
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61 | push r9
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62 | %endif
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63 |
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64 | ;
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65 | ; Load stack selector (not always necessary) and sometimes CS too.
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66 | ;
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67 | %if BS3_MODE_IS_RM_SYS(TMPL_MODE)
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68 | xor ax, ax
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69 | %elif BS3_MODE_IS_V86(TMPL_MODE)
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70 | extern v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
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71 | call v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
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72 | %elif BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
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73 | jmp BS3_SEL_R0_CS16:.reloaded_cs
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74 | .reloaded_cs:
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75 | mov ax, BS3_SEL_R0_SS16
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76 | %elif BS3_MODE_IS_32BIT_CODE(TMPL_MODE)
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77 | mov ax, BS3_SEL_R0_SS32
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78 | %elif BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
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79 | mov ax, BS3_SEL_R0_DS64
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80 | %else
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81 | %error "TMPL_MODE"
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82 | %endif
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83 | mov ss, ax
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84 |
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85 | ;
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86 | ; Load selector appropriate for accessing BS3SYSTEM16 data.
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87 | ;
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88 | %if BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
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89 | mov ax, BS3_SEL_SYSTEM16
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90 | %else
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91 | mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
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92 | %endif
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93 | mov ds, ax
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94 |
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95 | ;
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96 | ; Load the appropritate IDT or IVT.
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97 | ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
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98 | ;
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99 | %if BS3_MODE_IS_RM_SYS(TMPL_MODE)
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100 | BS3_EXTERN_SYSTEM16 Bs3Lidt_Ivt
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101 | TMPL_BEGIN_TEXT
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102 | lidt [Bs3Lidt_Ivt]
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103 |
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104 | %elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
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105 | BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt16
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106 | TMPL_BEGIN_TEXT
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107 | lidt [Bs3Lidt_Idt16 TMPL_WRT_SYSTEM16_OR_FLAT]
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108 |
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109 | %elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
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110 | BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt32
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111 | TMPL_BEGIN_TEXT
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112 | lidt [Bs3Lidt_Idt32 TMPL_WRT_SYSTEM16_OR_FLAT]
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113 |
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114 | %elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
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115 | BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt64
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116 | TMPL_BEGIN_TEXT
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117 | lidt [Bs3Lidt_Idt64 TMPL_WRT_SYSTEM16_OR_FLAT]
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118 | %else
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119 | %error "TMPL_MODE"
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120 | %endif
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121 |
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122 | %if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
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123 | ;
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124 | ; Load the appropriate task selector.
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125 | ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
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126 | ;
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127 | %if BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
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128 | BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss64
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129 | TMPL_BEGIN_TEXT
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130 | and byte [5 + Bs3Gdte_Tss64 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
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131 | mov ax, BS3_SEL_TSS64
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132 |
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133 | %elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
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134 | BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16
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135 | BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16DoubleFault
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136 | TMPL_BEGIN_TEXT
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137 | and byte [5 + Bs3Gdte_Tss16 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
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138 | and byte [5 + Bs3Gdte_Tss16DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
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139 | mov ax, BS3_SEL_TSS16
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140 |
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141 | %elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
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142 | BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32
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143 | BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32DoubleFault
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144 | BS3_EXTERN_SYSTEM16 Bs3Tss32
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145 | BS3_EXTERN_SYSTEM16 Bs3Tss32DoubleFault
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146 | TMPL_BEGIN_TEXT
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147 | and byte [5 + Bs3Gdte_Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
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148 | and byte [5 + Bs3Gdte_Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
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149 | mov eax, cr3
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150 | mov [X86TSS32.cr3 + Bs3Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], eax
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151 | mov [X86TSS32.cr3 + Bs3Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], eax
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152 | mov ax, BS3_SEL_TSS32
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153 | %else
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154 | %error "TMPL_BITS"
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155 | %endif
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156 | ltr ax
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157 | %endif ; !TMPL_CMN_R86
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158 |
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159 | %if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
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160 | ;
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161 | ; Load the LDT.
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162 | ;
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163 | mov ax, BS3_SEL_LDT
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164 | lldt ax
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165 | %endif
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166 |
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167 | ;
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168 | ; Load ds and es; clear fs and gs.
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169 | ;
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170 | %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
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171 | mov ax, BS3_SEL_DATA16
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172 | %else
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173 | mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
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174 | %endif
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175 | mov ds, ax
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176 | mov es, ax
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177 |
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178 | %if TMPL_BITS == 16
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179 | ; For restoring after Bs3Trap* calls below.
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180 | push ax
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181 | push ax
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182 |
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183 | cmp byte [BS3_DATA16_WRT(g_uBs3CpuDetected)], BS3CPU_80286
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184 | jbe .skip_fs_gs
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185 | %endif
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186 | xor ax, ax
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187 | mov fs, ax
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188 | mov gs, ax
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189 | .skip_fs_gs:
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190 |
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191 | ;
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192 | ; Set global indicating CPU mode.
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193 | ;
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194 | mov byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], TMPL_MODE
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195 |
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196 | ;
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197 | ; Install system call handler.
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198 | ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
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199 | ;
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200 | %if BS3_MODE_IS_RM_SYS(TMPL_MODE)
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201 | extern _Bs3TrapSystemCallHandler_rm
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202 | mov word [ss: BS3_TRAP_SYSCALL*4], _Bs3TrapSystemCallHandler_rm wrt CGROUP16
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203 | mov word [ss: BS3_TRAP_SYSCALL*4 + 2], CGROUP16
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204 |
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205 | %elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
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206 | BS3_EXTERN_CMN Bs3Trap16SetGate
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207 | extern TMPL_NM(Bs3TrapSystemCallHandler)
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208 | BS3_BEGIN_TEXT16
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209 | TMPL_BEGIN_TEXT
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210 | push 0 ; cParams
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211 | push TMPL_NM(Bs3TrapSystemCallHandler) wrt CGROUP16
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212 | push BS3_SEL_R0_CS16
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213 | push 3 ; DPL
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214 | push X86_SEL_TYPE_SYS_286_INT_GATE
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215 | push BS3_TRAP_SYSCALL
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216 | BS3_CALL Bs3Trap16SetGate,6
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217 | add xSP, xCB * 6
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218 |
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219 | %elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
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220 | BS3_EXTERN_CMN Bs3Trap32SetGate
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221 | extern TMPL_NM(Bs3TrapSystemCallHandler)
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222 | TMPL_BEGIN_TEXT
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223 | push 0 ; cParams
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224 | push dword TMPL_NM(Bs3TrapSystemCallHandler) wrt FLAT
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225 | push BS3_SEL_R0_CS32
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226 | push 3 ; DPL
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227 | push X86_SEL_TYPE_SYS_386_INT_GATE
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228 | push BS3_TRAP_SYSCALL
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229 | BS3_CALL Bs3Trap32SetGate,6
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230 | add xSP, xCB * 6
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231 |
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232 | %elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
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233 | BS3_EXTERN_CMN Bs3Trap64SetGate
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234 | extern _Bs3TrapSystemCallHandler_lm64
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235 | TMPL_BEGIN_TEXT
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236 | push 0 ; bIst
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237 | %if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
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238 | push _Bs3TrapSystemCallHandler_lm64 wrt FLAT
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239 | %else
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240 | push dword 0 ; upper offset
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241 | push dword _Bs3TrapSystemCallHandler_lm64 wrt FLAT
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242 | %endif
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243 | push BS3_SEL_R0_CS64
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244 | push 3 ; DPL
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245 | push AMD64_SEL_TYPE_SYS_INT_GATE
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246 | push BS3_TRAP_SYSCALL
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247 | BS3_CALL Bs3Trap64SetGate,6
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248 | add xSP, xCB * 5 + 8
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249 | %else
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250 | %error "TMPL_BITS"
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251 | %endif
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252 |
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253 | %if TMPL_BITS == 16
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254 | ; Restoring ds and es after the above calls.
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255 | pop es
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256 | pop ds
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257 | %endif
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258 |
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259 | ;
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260 | ; Epilogue.
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261 | ;
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262 | %if TMPL_BITS == 64
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263 | pop r9
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264 | pop r8
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265 | %endif
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266 | TONLY16 pop xBX
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267 | pop xDX
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268 | pop xCX
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269 | pop xAX
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270 | %ifdef BS3_STRICT
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271 | cmp xBP, xSP
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272 | je .return_stack_ok
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273 | int3
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274 | .return_stack_ok:
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275 | %endif
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276 | pop xBP
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277 | ret
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278 | BS3_PROC_END_MODE Bs3EnteredMode
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279 |
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