Rev 712 | Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
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709 | diamond | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | ; Virtual-8086 mode manager |
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9 | ; diamond, 2007, 2008 |
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10 | |||
11 | DEBUG_SHOW_IO = 0 |
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12 | |||
13 | struc V86_machine |
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14 | { |
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15 | ; page directory |
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16 | .pagedir dd ? |
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17 | ; translation table: V86 address -> flat linear address |
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18 | .pages dd ? |
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19 | ; mutex to protect all data from writing by multiple threads at one time |
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20 | .mutex dd ? |
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21 | ; i/o permission map |
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22 | .iopm dd ? |
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23 | .size = $ |
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24 | } |
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25 | virtual at 0 |
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26 | V86_machine V86_machine |
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27 | end virtual |
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28 | |||
29 | ; Create V86 machine |
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30 | ; in: nothing |
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31 | ; out: eax = handle (pointer to struc V86_machine) |
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32 | ; eax = NULL => failure |
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33 | ; destroys: ebx, ecx, edx (due to malloc) |
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34 | v86_create: |
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35 | ; allocate V86_machine structure |
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36 | mov eax, V86_machine.size |
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37 | call malloc |
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38 | test eax, eax |
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39 | jz .fail |
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40 | ; initialize mutex |
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41 | and dword [eax+V86_machine.mutex], 0 |
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42 | ; allocate tables |
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43 | mov ebx, eax |
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44 | ; We allocate 4 pages. |
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45 | ; First is main page directory for V86 mode. |
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46 | ; Second page: |
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47 | ; first half (0x800 bytes) is page table for addresses 0 - 0x100000, |
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48 | ; second half is for V86-to-linear translation. |
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49 | ; Third and fourth are for I/O permission map. |
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50 | push 4000h |
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51 | call kernel_alloc |
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52 | test eax, eax |
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53 | jz .fail2 |
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54 | mov [ebx+V86_machine.pagedir], eax |
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55 | push edi eax |
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56 | mov edi, eax |
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57 | add eax, 1800h |
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58 | mov [ebx+V86_machine.pages], eax |
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59 | ; initialize tables |
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60 | mov ecx, 2000h/4 |
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61 | xor eax, eax |
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62 | rep stosd |
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63 | mov [ebx+V86_machine.iopm], edi |
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64 | dec eax |
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65 | mov ecx, 2000h/4 |
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66 | rep stosd |
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67 | pop eax |
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68 | ; page directory: first entry is page table... |
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69 | mov edi, eax |
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70 | add eax, 1000h |
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71 | push eax |
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72 | call get_pg_addr |
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73 | or al, PG_UW |
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74 | stosd |
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75 | ; ...and also copy system page tables |
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76 | ; thx to Serge, system is located at high addresses |
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77 | add edi, (OS_BASE shr 20) - 4 |
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78 | push esi |
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79 | mov esi, (OS_BASE shr 20) + sys_pgdir |
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80 | mov ecx, 0x80000000 shr 22 |
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81 | rep movsd |
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82 | pop esi |
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83 | ; now V86 specific: initialize known addresses in first Mb |
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84 | pop eax edi |
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85 | ; first page - BIOS data (shared between all machines!) |
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86 | ; physical address = 0x2f0000 |
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87 | ; linear address = BOOT_VAR = OS_BASE + 0x2f0000 |
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88 | mov dword [eax], (BOOT_VAR - OS_BASE) or 111b |
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89 | mov dword [eax+800h], BOOT_VAR |
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90 | ; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!) |
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91 | ; physical address = 0x9F000 |
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92 | ; linear address = 0x8009F000 |
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93 | mov dword [eax+0x9E*4], 0x9E000 or 111b |
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94 | mov dword [eax+0x9E*4+800h], 0x9E000 + OS_BASE |
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95 | mov dword [eax+0x9F*4], 0x9F000 or 111b |
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96 | mov dword [eax+0x9F*4+800h], 0x9F000 + OS_BASE |
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97 | ; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!) |
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98 | ; physical address = 0xC0000 |
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99 | ; linear address = 0x800C0000 |
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100 | mov ecx, 0xC0 |
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101 | @@: |
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102 | mov edx, ecx |
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103 | shl edx, 12 |
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104 | push edx |
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105 | or edx, 101b |
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106 | mov [eax+ecx*4], edx |
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107 | pop edx |
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108 | add edx, OS_BASE |
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109 | mov [eax+ecx*4+0x800], edx |
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110 | inc cl |
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111 | jnz @b |
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112 | mov eax, ebx |
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113 | ret |
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114 | .fail2: |
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115 | mov eax, ebx |
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116 | call free |
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117 | .fail: |
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118 | xor eax, eax |
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119 | ret |
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120 | |||
121 | ; Destroy V86 machine |
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122 | ; in: eax = handle |
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123 | ; out: nothing |
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124 | ; destroys: eax, ebx, ecx, edx (due to free) |
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125 | v86_destroy: |
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126 | push eax |
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127 | stdcall kernel_free, [eax+V86_machine.pagedir] |
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128 | pop eax |
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129 | jmp free |
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130 | |||
131 | ; Translate V86-address to linear address |
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132 | ; in: eax=V86 address |
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133 | ; esi=handle |
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134 | ; out: eax=linear address |
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135 | ; destroys: nothing |
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136 | v86_get_lin_addr: |
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137 | push ecx edx |
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138 | mov ecx, eax |
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139 | mov edx, [esi+V86_machine.pages] |
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140 | shr ecx, 12 |
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141 | and eax, 0xFFF |
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142 | add eax, [edx+ecx*4] ; atomic operation, no mutex needed |
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143 | pop edx ecx |
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144 | ret |
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145 | |||
146 | ; Sets linear address for V86-page |
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147 | ; in: eax=linear address (must be page-aligned) |
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148 | ; ecx=V86 page (NOT address!) |
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149 | ; esi=handle |
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150 | ; out: nothing |
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151 | ; destroys: nothing |
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152 | v86_set_page: |
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153 | push eax ebx |
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154 | mov ebx, [esi+V86_machine.pagedir] |
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155 | mov [ebx+ecx*4+0x1800], eax |
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156 | call get_pg_addr |
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157 | or al, 111b |
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158 | mov [ebx+ecx*4+0x1000], eax |
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159 | pop ebx eax |
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160 | ret |
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161 | |||
162 | ; Allocate memory in V86 machine |
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163 | ; in: eax=size (in bytes) |
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164 | ; esi=handle |
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165 | ; out: eax=V86 address, para-aligned (0x10 multiple) |
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166 | ; destroys: nothing |
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167 | ; недописана!!! |
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168 | ;v86_alloc: |
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169 | ; push ebx ecx edx edi |
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170 | ; lea ebx, [esi+V86_machine.mutex] |
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171 | ; call wait_mutex |
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172 | ; add eax, 0x1F |
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173 | ; shr eax, 4 |
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174 | ; mov ebx, 0x1000 ; start with address 0x1000 (second page) |
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175 | ; mov edi, [esi+V86_machine.tables] |
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176 | ;.l: |
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177 | ; mov ecx, ebx |
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178 | ; shr ecx, 12 |
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179 | ; mov edx, [edi+0x1000+ecx*4] ; get linear address |
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180 | ; test edx, edx ; page allocated? |
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181 | ; jz .unalloc |
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182 | ; mov ecx, ebx |
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183 | ; and ecx, 0xFFF |
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184 | ; add edx, ecx |
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185 | ; cmp dword [edx], 0 ; free block? |
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186 | ; jnz .n |
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187 | ; cmp dword [edx+4], |
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188 | ; and [esi+V86_machine.mutex], 0 |
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189 | ; pop edi edx ecx ebx |
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190 | ; ret |
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191 | |||
192 | uglobal |
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193 | sys_v86_machine dd ? |
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194 | endg |
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195 | |||
196 | ; Called from kernel.asm at first stages of loading |
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197 | ; Initialize system V86 machine (used to simulate BIOS int 13h) |
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198 | init_sys_v86: |
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199 | call v86_create |
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200 | mov [sys_v86_machine], eax |
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201 | test eax, eax |
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202 | jz .ret |
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203 | mov byte [BOOT_VAR + 0x500], 0xCD |
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204 | mov byte [BOOT_VAR + 0x501], 0x13 |
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205 | mov byte [BOOT_VAR + 0x502], 0xF4 |
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206 | mov byte [BOOT_VAR + 0x503], 0xCD |
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207 | mov byte [BOOT_VAR + 0x504], 0x10 |
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208 | mov byte [BOOT_VAR + 0x505], 0xF4 |
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209 | mov esi, eax |
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210 | mov ebx, [eax+V86_machine.pagedir] |
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211 | mov dword [ebx+0x9C*4+0x1000], 0x9C000 or 111b |
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212 | mov dword [ebx+0x9C*4+0x1800], OS_BASE + 0x9C000 |
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213 | mov dword [ebx+0x9D*4+0x1000], 0x9D000 or 111b |
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214 | mov dword [ebx+0x9D*4+0x1800], OS_BASE + 0x9D000 |
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215 | if ~DEBUG_SHOW_IO |
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216 | ; allow access to all ports |
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217 | mov ecx, [esi+V86_machine.iopm] |
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218 | xor eax, eax |
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219 | mov edi, ecx |
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220 | mov ecx, 10000h/8/4 |
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221 | rep stosd |
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222 | end if |
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223 | .ret: |
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224 | ret |
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225 | |||
226 | struc v86_regs |
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227 | { |
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228 | ; don't change the order, it is important |
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229 | .edi dd ? |
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230 | .esi dd ? |
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231 | .ebp dd ? |
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232 | dd ? ; ignored |
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233 | .ebx dd ? |
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234 | .edx dd ? |
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235 | .ecx dd ? |
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236 | .eax dd ? |
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237 | .eip dd ? |
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238 | .cs dd ? |
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239 | .eflags dd ? ; VM flag must be set! |
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240 | .esp dd ? |
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241 | .ss dd ? |
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242 | .es dd ? |
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243 | .ds dd ? |
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244 | .fs dd ? |
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245 | .gs dd ? |
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246 | .size = $ |
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247 | } |
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248 | virtual at 0 |
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249 | v86_regs v86_regs |
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250 | end virtual |
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251 | |||
252 | ; Run V86 machine |
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253 | ; in: ebx -> registers for V86 (two structures: in and out) |
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254 | ; esi = handle |
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255 | ; ecx = expected end address (CS:IP) |
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256 | ; edx = IRQ to hook or -1 if not required |
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257 | ; out: structure pointed to by ebx is filled with new values |
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258 | ; eax = 1 - exception has occured, cl contains code |
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259 | ; eax = 2 - access to disabled i/o port, ecx contains port address |
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260 | ; eax = 3 - IRQ is already hooked by another VM |
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261 | ; destroys: nothing |
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262 | v86_start: |
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263 | pushad |
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264 | |||
265 | cli |
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266 | |||
267 | mov ecx, [CURRENT_TASK] |
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268 | shl ecx, 8 |
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269 | add ecx, SLOT_BASE |
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270 | |||
271 | mov eax, [esi+V86_machine.iopm] |
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272 | call get_pg_addr |
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273 | inc eax |
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274 | push dword [ecx+APPDATA.io_map] |
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275 | push dword [ecx+APPDATA.io_map+4] |
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276 | mov dword [ecx+APPDATA.io_map], eax |
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277 | mov dword [page_tabs + (tss._io_map_0 shr 10)], eax |
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278 | add eax, 0x1000 |
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279 | mov dword [ecx+APPDATA.io_map+4], eax |
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280 | mov dword [page_tabs + (tss._io_map_1 shr 10)], eax |
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281 | |||
282 | push [ecx+APPDATA.dir_table] |
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283 | push [ecx+APPDATA.saved_esp0] |
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284 | mov [ecx+APPDATA.saved_esp0], esp |
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285 | mov [tss._esp0], esp |
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286 | |||
287 | mov eax, [esi+V86_machine.pagedir] |
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288 | call get_pg_addr |
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289 | mov [ecx+APPDATA.dir_table], eax |
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290 | mov cr3, eax |
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291 | |||
292 | ; mov [irq_tab+5*4], my05 |
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293 | |||
294 | ; We do not enable interrupts, because V86 IRQ redirector assumes that |
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295 | ; machine is running |
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296 | ; They will be enabled by IRET. |
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297 | ; sti |
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298 | |||
299 | mov eax, esi |
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300 | sub esp, v86_regs.size |
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301 | mov esi, ebx |
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302 | mov edi, esp |
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303 | mov ecx, v86_regs.size/4 |
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304 | rep movsd |
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305 | |||
306 | cmp edx, -1 |
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307 | jz .noirqhook |
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308 | uglobal |
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309 | v86_irqhooks rd 16*2 |
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310 | endg |
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311 | cmp [v86_irqhooks+edx*8], 0 |
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312 | jz @f |
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313 | cmp [v86_irqhooks+edx*8], eax |
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314 | jz @f |
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315 | mov esi, v86_irqerr |
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316 | call sys_msg_board_str |
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317 | inc [v86_irqhooks+edx*8+4] |
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318 | mov eax, 3 |
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319 | jmp v86_exc_c.exit |
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320 | @@: |
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321 | mov [v86_irqhooks+edx*8], eax |
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322 | inc [v86_irqhooks+edx*8+4] |
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323 | .noirqhook: |
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324 | |||
325 | popad |
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326 | iretd |
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327 | |||
328 | ; It is only possible to leave virtual-8086 mode by faulting to |
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329 | ; a protected-mode interrupt handler (typically the general-protection |
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330 | ; exception handler, which in turn calls the virtual 8086-mode monitor). |
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331 | |||
332 | v86_debug_exc: |
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333 | pushad |
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334 | xor eax, eax |
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335 | mov dr6, eax |
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336 | mov bl, 1 |
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337 | jmp v86_exc_c |
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338 | |||
339 | v86_page_fault: |
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340 | add esp, 4 |
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341 | pushad |
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342 | mov bl, 14 |
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343 | jmp v86_exc_c |
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344 | |||
345 | v86_except_16: |
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346 | pushad |
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347 | mov bl, 16 |
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348 | jmp v86_exc_c |
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349 | v86_except_19: |
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350 | pushad |
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351 | mov bl, 19 |
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352 | |||
353 | iglobal |
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354 | v86_exc_str1 db 'V86 : unexpected exception ',0 |
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355 | v86_exc_str2 db ' at ',0 |
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356 | v86_exc_str3 db ':',0 |
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357 | v86_exc_str4 db 13,10,'V86 : faulted code:',0 |
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358 | v86_exc_str5 db ' (unavailable)',0 |
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359 | v86_newline db 13,10,0 |
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360 | v86_io_str1 db 'V86 : access to disabled i/o port ',0 |
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361 | v86_io_byte db ' (byte)',13,10,0 |
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362 | v86_io_word db ' (word)',13,10,0 |
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363 | v86_io_dword db ' (dword)',13,10,0 |
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364 | v86_irqerr db 'V86 : IRQ already hooked',13,10,0 |
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365 | endg |
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366 | |||
367 | v86_exc_c: |
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368 | mov ax, app_data |
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369 | mov ds, ax |
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370 | mov es, ax |
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371 | ; Did we all that we have wanted to do? |
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372 | mov eax, [esp+v86_regs.size+10h+18h] |
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373 | cmp word [esp+v86_regs.eip], ax |
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374 | jnz @f |
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375 | shr eax, 16 |
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376 | cmp word [esp+v86_regs.cs], ax |
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377 | jz .done |
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378 | @@: |
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379 | ; Various system events, which must be handled, result in #GP |
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380 | cmp bl, 13 |
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381 | jnz .nogp |
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382 | ; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error |
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383 | cmp word [esp+v86_regs.eip+2], 0 |
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384 | jnz .nogp |
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385 | ; Otherwise we can safely access byte at CS:IP |
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386 | ; (because it is #GP, not #PF handler) |
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387 | ; Если бы мы могли схлопотать исключение только из-за чтения байтов кода, |
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388 | ; мы бы его уже схлопотали и это было бы не #GP |
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389 | movzx esi, word [esp+v86_regs.cs] |
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390 | shl esi, 4 |
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391 | add esi, [esp+v86_regs.eip] |
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392 | lodsb |
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393 | cmp al, 0xCD ; int xx command = CD xx |
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394 | jz .handle_int |
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395 | cmp al, 0xCF |
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396 | jz .handle_iret |
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397 | cmp al, 0xF3 |
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398 | jz .handle_rep |
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399 | cmp al, 0xEC |
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400 | jz .handle_in |
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401 | cmp al, 0xED |
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402 | jz .handle_in_word |
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403 | cmp al, 0xEE |
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404 | jz .handle_out |
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405 | cmp al, 0xEF |
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406 | jz .handle_out_word |
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407 | cmp al, 0xE4 |
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408 | jz .handle_in_imm |
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409 | cmp al, 0xE6 |
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410 | jz .handle_out_imm |
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411 | cmp al, 0x9C |
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412 | jz .handle_pushf |
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413 | cmp al, 0x9D |
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414 | jz .handle_popf |
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415 | cmp al, 0xFA |
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416 | jz .handle_cli |
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417 | cmp al, 0xFB |
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418 | jz .handle_sti |
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419 | cmp al, 0x66 |
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420 | jz .handle_66 |
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421 | jmp .nogp |
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422 | .handle_int: |
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423 | cmp word [esp+v86_regs.eip], 0xFFFF |
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424 | jae .nogp |
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425 | xor eax, eax |
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426 | lodsb |
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427 | ; call sys_msg_board_byte |
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428 | ; simulate INT command |
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429 | ; N.B. It is possible that some checks need to be corrected, |
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430 | ; but at least in case of normal execution the code works. |
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431 | .simulate_int: |
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432 | cmp word [esp+v86_regs.esp], 6 |
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433 | jae @f |
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434 | mov bl, 12 ; #SS exception |
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435 | jmp .nogp |
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436 | @@: |
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437 | movzx edx, word [esp+v86_regs.ss] |
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438 | shl edx, 4 |
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439 | push eax |
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440 | movzx eax, word [esp+4+v86_regs.esp] |
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441 | sub eax, 6 |
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442 | add edx, eax |
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443 | mov eax, edx |
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444 | mov esi, [esp+4+v86_regs.size+10h+4] |
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445 | call v86_get_lin_addr |
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446 | cmp eax, 0x1000 |
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447 | jae @f |
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448 | mov bl, 14 ; #PF exception |
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449 | jmp .nogp |
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450 | @@: |
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451 | lea eax, [edx+5] |
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452 | call v86_get_lin_addr |
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453 | cmp eax, 0x1000 |
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454 | jae @f |
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455 | mov bl, 14 ; #PF exception |
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456 | jmp .nogp |
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457 | @@: |
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458 | sub word [esp+4+v86_regs.esp], 6 |
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459 | mov eax, [esp+4+v86_regs.eip] |
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460 | inc eax |
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461 | inc eax |
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462 | mov word [edx], ax |
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463 | mov eax, [esp+4+v86_regs.cs] |
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464 | mov word [edx+2], ax |
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465 | mov eax, [esp+4+v86_regs.eflags] |
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466 | mov word [edx+4], ax |
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467 | pop eax |
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468 | mov cx, [eax*4] |
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469 | mov word [esp+v86_regs.eip], cx |
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470 | mov cx, [eax*4+2] |
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471 | mov word [esp+v86_regs.cs], cx |
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472 | ; note that interrupts will be disabled globally at IRET |
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473 | and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags |
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474 | ; continue V86 execution |
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475 | popad |
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476 | iretd |
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477 | .handle_iret: |
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478 | cmp word [esp+v86_regs.esp], 0x10000 - 6 |
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479 | jbe @f |
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480 | mov bl, 12 |
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481 | jmp .nogp |
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482 | @@: |
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483 | movzx edx, word [esp+v86_regs.ss] |
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484 | shl edx, 4 |
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485 | movzx eax, word [esp+v86_regs.esp] |
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486 | add edx, eax |
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487 | mov eax, edx |
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488 | mov esi, [esp+v86_regs.size+10h+4] |
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489 | call v86_get_lin_addr |
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490 | cmp eax, 0x1000 |
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491 | jae @f |
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492 | mov bl, 14 |
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493 | jmp .nogp |
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494 | @@: |
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495 | lea eax, [edx+5] |
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496 | call v86_get_lin_addr |
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497 | cmp eax, 0x1000 |
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498 | jae @f |
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499 | mov bl, 14 |
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500 | jmp .nogp |
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501 | @@: |
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502 | mov ax, [edx] |
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503 | mov word [esp+v86_regs.eip], ax |
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504 | mov ax, [edx+2] |
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505 | mov word [esp+v86_regs.cs], ax |
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506 | mov ax, [edx+4] |
||
507 | mov word [esp+v86_regs.eflags], ax |
||
508 | add word [esp+v86_regs.esp], 6 |
||
509 | popad |
||
510 | iretd |
||
511 | .handle_pushf: |
||
512 | cmp word [esp+v86_regs.esp], 1 |
||
513 | jnz @f |
||
514 | mov bl, 12 |
||
515 | jmp .nogp |
||
516 | @@: |
||
517 | movzx edx, word [esp+v86_regs.ss] |
||
518 | shl edx, 4 |
||
519 | mov eax, [esp+v86_regs.esp] |
||
520 | sub eax, 2 |
||
521 | movzx eax, ax |
||
522 | add edx, eax |
||
523 | mov eax, edx |
||
524 | mov esi, [esp+v86_regs.size+10h+4] |
||
525 | call v86_get_lin_addr |
||
526 | cmp eax, 0x1000 |
||
527 | jae @f |
||
528 | mov bl, 14 ; #PF exception |
||
529 | jmp .nogp |
||
530 | @@: |
||
531 | lea eax, [edx+1] |
||
532 | call v86_get_lin_addr |
||
533 | cmp eax, 0x1000 |
||
534 | jae @f |
||
535 | mov bl, 14 |
||
536 | jmp .nogp |
||
537 | @@: |
||
538 | sub word [esp+v86_regs.esp], 2 |
||
539 | mov eax, [esp+v86_regs.eflags] |
||
540 | mov [edx], ax |
||
541 | inc word [esp+v86_regs.eip] |
||
542 | popad |
||
543 | iretd |
||
544 | .handle_popf: |
||
545 | cmp word [esp+v86_regs.esp], 0xFFFF |
||
546 | jnz @f |
||
547 | mov bl, 12 |
||
548 | jmp .nogp |
||
549 | @@: |
||
550 | movzx edx, word [esp+v86_regs.ss] |
||
551 | shl edx, 4 |
||
552 | movzx eax, word [esp+v86_regs.esp] |
||
553 | add edx, eax |
||
554 | mov eax, edx |
||
555 | mov esi, [esp+v86_regs.size+10h+4] |
||
556 | call v86_get_lin_addr |
||
557 | cmp eax, 0x1000 |
||
558 | jae @f |
||
559 | mov bl, 14 ; #PF exception |
||
560 | jmp .nogp |
||
561 | @@: |
||
562 | lea eax, [edx+1] |
||
563 | call v86_get_lin_addr |
||
564 | cmp eax, 0x1000 |
||
565 | jae @f |
||
566 | mov bl, 14 |
||
567 | jmp .nogp |
||
568 | @@: |
||
569 | mov ax, [edx] |
||
570 | mov word [esp+v86_regs.eflags], ax |
||
571 | add word [esp+v86_regs.esp], 2 |
||
572 | inc word [esp+v86_regs.eip] |
||
573 | popad |
||
574 | iretd |
||
575 | .handle_cli: |
||
576 | and byte [esp+v86_regs.eflags+1], not 2 |
||
577 | inc word [esp+v86_regs.eip] |
||
578 | popad |
||
579 | iretd |
||
580 | .handle_sti: |
||
581 | or byte [esp+v86_regs.eflags+1], 2 |
||
582 | inc word [esp+v86_regs.eip] |
||
583 | popad |
||
584 | iretd |
||
585 | .handle_rep: |
||
586 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
587 | jae .nogp |
||
588 | lodsb |
||
589 | cmp al, 6Eh |
||
590 | jz .handle_rep_outsb |
||
591 | jmp .nogp |
||
592 | .handle_rep_outsb: |
||
593 | .handle_in: |
||
594 | .handle_out: |
||
595 | .invalid_io_byte: |
||
596 | movzx ebx, word [esp+v86_regs.edx] |
||
597 | mov ecx, 1 |
||
598 | jmp .invalid_io |
||
599 | .handle_in_imm: |
||
600 | .handle_out_imm: |
||
601 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
602 | jae .nogp |
||
603 | lodsb |
||
604 | movzx ebx, al |
||
605 | mov ecx, 1 |
||
606 | jmp .invalid_io |
||
607 | .handle_66: |
||
608 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
609 | jae .nogp |
||
610 | lodsb |
||
611 | cmp al, 0xEF |
||
612 | jz .handle_out_dword |
||
613 | cmp al, 0xED |
||
614 | jz .handle_in_dword |
||
615 | jmp .nogp |
||
616 | .handle_in_word: |
||
617 | .handle_out_word: |
||
618 | movzx ebx, word [esp+v86_regs.edx] |
||
619 | mov ecx, 2 |
||
620 | jmp .invalid_io |
||
621 | .handle_in_dword: |
||
622 | .handle_out_dword: |
||
623 | .invalid_io_dword: |
||
624 | movzx ebx, word [esp+v86_regs.edx] |
||
625 | mov ecx, 4 |
||
626 | .invalid_io: |
||
627 | mov esi, v86_io_str1 |
||
628 | call sys_msg_board_str |
||
629 | mov eax, ebx |
||
630 | call sys_msg_board_dword |
||
631 | mov esi, v86_io_byte |
||
632 | cmp ecx, 1 |
||
633 | jz @f |
||
634 | mov esi, v86_io_word |
||
635 | cmp ecx, 2 |
||
636 | jz @f |
||
637 | mov esi, v86_io_dword |
||
638 | @@: |
||
639 | call sys_msg_board_str |
||
640 | if DEBUG_SHOW_IO |
||
641 | mov edx, ebx |
||
642 | mov ebx, 200 |
||
643 | call delay_hs |
||
644 | mov esi, [esp+v86_regs.size+10h+4] |
||
645 | mov eax, [esi+V86_machine.iopm] |
||
646 | @@: |
||
647 | btr [eax], edx |
||
648 | inc edx |
||
649 | loop @b |
||
650 | popad |
||
651 | iretd |
||
652 | else |
||
653 | mov eax, 2 |
||
654 | jmp .exit |
||
655 | end if |
||
656 | .nogp: |
||
657 | |||
658 | mov esi, v86_exc_str1 |
||
659 | call sys_msg_board_str |
||
660 | mov al, bl |
||
661 | call sys_msg_board_byte |
||
662 | mov esi, v86_exc_str2 |
||
663 | call sys_msg_board_str |
||
664 | mov ax, [esp+32+4] |
||
665 | call sys_msg_board_word |
||
666 | mov esi, v86_exc_str3 |
||
667 | call sys_msg_board_str |
||
668 | mov ax, [esp+32] |
||
669 | call sys_msg_board_word |
||
670 | mov esi, v86_exc_str4 |
||
671 | call sys_msg_board_str |
||
672 | mov ecx, 8 |
||
673 | movzx edx, word [esp+32+4] |
||
674 | shl edx, 4 |
||
675 | add edx, [esp+32] |
||
676 | @@: |
||
677 | mov esi, [esp+v86_regs.size+10h+4] |
||
678 | mov eax, edx |
||
679 | call v86_get_lin_addr |
||
680 | cmp eax, 0x1000 |
||
681 | jb .nopage |
||
682 | mov esi, v86_exc_str3-2 |
||
683 | call sys_msg_board_str |
||
684 | mov al, [edx] |
||
685 | call sys_msg_board_byte |
||
686 | inc edx |
||
687 | loop @b |
||
688 | jmp @f |
||
689 | .nopage: |
||
690 | mov esi, v86_exc_str5 |
||
691 | call sys_msg_board_str |
||
692 | @@: |
||
693 | mov esi, v86_newline |
||
694 | call sys_msg_board_str |
||
695 | mov eax, 1 |
||
696 | jmp .exit |
||
697 | |||
698 | .done: |
||
699 | xor eax, eax |
||
700 | |||
701 | .exit: |
||
702 | mov [esp+v86_regs.size+10h+1Ch], eax |
||
703 | mov [esp+v86_regs.size+10h+18h], ebx |
||
704 | |||
705 | mov edx, [esp+v86_regs.size+10h+14h] |
||
706 | cmp edx, -1 |
||
707 | jz @f |
||
708 | dec [v86_irqhooks+edx*8+4] |
||
709 | jnz @f |
||
710 | and [v86_irqhooks+edx*8], 0 |
||
711 | @@: |
||
712 | |||
713 | mov esi, esp |
||
714 | mov edi, [esi+v86_regs.size+10h+10h] |
||
715 | add edi, v86_regs.size |
||
716 | mov ecx, v86_regs.size/4 |
||
717 | rep movsd |
||
718 | mov esp, esi |
||
719 | |||
720 | cli |
||
721 | mov ecx, [CURRENT_TASK] |
||
722 | shl ecx, 8 |
||
723 | pop eax |
||
724 | mov [SLOT_BASE+ecx+APPDATA.saved_esp0], eax |
||
725 | mov [tss._esp0], eax |
||
726 | pop eax |
||
727 | mov [SLOT_BASE+ecx+APPDATA.dir_table], eax |
||
728 | pop ebx |
||
729 | mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx |
||
730 | mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx |
||
731 | pop ebx |
||
732 | mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx |
||
733 | mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx |
||
734 | mov cr3, eax |
||
735 | ; mov [irq_tab+5*4], 0 |
||
736 | sti |
||
737 | |||
738 | popad |
||
739 | ret |
||
740 | |||
741 | ;my05: |
||
742 | ; mov dx, 30C2h |
||
743 | ; mov cx, 4 |
||
744 | ;.0: |
||
745 | ; in al, dx |
||
746 | ; cmp al, 0FFh |
||
747 | ; jz @f |
||
748 | ; test al, 4 |
||
749 | ; jnz .1 |
||
750 | ;@@: |
||
751 | ; add dx, 8 |
||
752 | ; in al, dx |
||
753 | ; cmp al, 0FFh |
||
754 | ; jz @f |
||
755 | ; test al, 4 |
||
756 | ; jnz .1 |
||
757 | ;@@: |
||
758 | ; loop .0 |
||
759 | ; ret |
||
760 | ;.1: |
||
761 | ; or al, 84h |
||
762 | ; out dx, al |
||
763 | ;.2: |
||
764 | ; mov dx, 30F7h |
||
765 | ; in al, dx |
||
766 | ; mov byte [BOOT_VAR + 48Eh], 0FFh |
||
767 | ; ret |
||
768 | |||
769 | v86_irq: |
||
770 | ; push eax/pushad/jmp v86_irq |
||
771 | ; eax = irq |
||
772 | mov ebx, eax |
||
773 | lea esi, [esp+18h] |
||
774 | lea edi, [esi+4] |
||
775 | mov ecx, 7 |
||
776 | std |
||
777 | rep movsd |
||
778 | cld |
||
779 | mov edi, ebx |
||
780 | |||
781 | v86_irq2: |
||
782 | ; pushad/call v86_irq2 |
||
783 | ; edi = irq |
||
784 | pop eax |
||
785 | mov esi, [v86_irqhooks+edi*8] ; get VM handle |
||
786 | mov eax, [esi+V86_machine.pagedir] |
||
787 | call get_pg_addr |
||
788 | mov ecx, [CURRENT_TASK] |
||
789 | shl ecx, 8 |
||
790 | cmp [SLOT_BASE+ecx+APPDATA.dir_table], eax |
||
791 | jnz .notcurrent |
||
792 | lea eax, [edi+8] |
||
793 | cmp al, 10h |
||
794 | jb @f |
||
795 | add al, 70h-8 |
||
796 | @@: |
||
797 | jmp v86_exc_c.simulate_int |
||
798 | .notcurrent: |
||
799 | mov ebx, SLOT_BASE + 0x100 |
||
800 | mov ecx, [TASK_COUNT] |
||
801 | .scan: |
||
802 | cmp [ebx+APPDATA.dir_table], eax |
||
803 | jnz .cont |
||
804 | push ecx |
||
805 | mov ecx, [ebx+APPDATA.saved_esp0] |
||
806 | cmp word [ecx-v86_regs.size+v86_regs.esp], 6 |
||
807 | jb .cont2 |
||
808 | movzx edx, word [ecx-v86_regs.size+v86_regs.ss] |
||
809 | shl edx, 4 |
||
810 | push eax |
||
811 | movzx eax, word [ecx-v86_regs.size+v86_regs.esp] |
||
812 | sub eax, 6 |
||
813 | add edx, eax |
||
814 | mov eax, edx |
||
815 | call v86_get_lin_addr |
||
816 | cmp eax, 0x1000 |
||
817 | jb .cont3 |
||
818 | lea eax, [edx+5] |
||
819 | call v86_get_lin_addr |
||
820 | cmp eax, 0x1000 |
||
821 | jb .cont3 |
||
822 | pop eax |
||
823 | pop ecx |
||
824 | jmp .found |
||
825 | .cont3: |
||
826 | pop eax |
||
827 | .cont2: |
||
828 | pop ecx |
||
829 | .cont: |
||
830 | loop .scan |
||
831 | mov al, 20h |
||
832 | out 20h, al |
||
833 | cmp edi, 8 |
||
834 | jb @f |
||
835 | out 0A0h, al |
||
836 | @@: |
||
837 | popad |
||
838 | iretd |
||
839 | .found: |
||
840 | mov cr3, eax |
||
841 | sub word [esi-v86_regs.size+v86_regs.esp], 6 |
||
842 | mov ecx, [esi-v86_regs.size+v86_regs.eip] |
||
843 | mov word [edx], cx |
||
844 | mov ecx, [esi-v86_regs.size+v86_regs.cs] |
||
845 | mov word [edx+2], cx |
||
846 | mov ecx, [esi-v86_regs.size+v86_regs.eflags] |
||
847 | mov word [edx+4], cx |
||
848 | lea eax, [edi+8] |
||
849 | cmp al, 10h |
||
850 | jb @f |
||
851 | add al, 70h-8 |
||
852 | @@: |
||
853 | mov cx, [eax*4] |
||
854 | mov word [esi-v86_regs.size+v86_regs.eip], cx |
||
855 | mov cx, [eax*4+2] |
||
856 | mov word [esi-v86_regs.size+v86_regs.cs], cx |
||
857 | and byte [esi-v86_regs.size+v86_regs.eflags+1], not 3 |
||
858 | push ebx |
||
859 | call update_counters |
||
860 | pop ebx |
||
861 | sub ebx, SLOT_BASE |
||
862 | shr ebx, 8 |
||
863 | mov esi, [CURRENT_TASK] |
||
864 | call do_change_task |
||
865 | popad |
||
866 | iretd |