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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 | |||
750 | victor | 8 | $Revision: 971 $ |
9 | |||
709 | diamond | 10 | ; Virtual-8086 mode manager |
11 | ; diamond, 2007, 2008 |
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12 | |||
13 | DEBUG_SHOW_IO = 0 |
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14 | |||
15 | struc V86_machine |
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16 | { |
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17 | ; page directory |
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18 | .pagedir dd ? |
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19 | ; translation table: V86 address -> flat linear address |
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20 | .pages dd ? |
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21 | ; mutex to protect all data from writing by multiple threads at one time |
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22 | .mutex dd ? |
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23 | ; i/o permission map |
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24 | .iopm dd ? |
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25 | .size = $ |
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26 | } |
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27 | virtual at 0 |
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28 | V86_machine V86_machine |
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29 | end virtual |
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30 | |||
31 | ; Create V86 machine |
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32 | ; in: nothing |
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33 | ; out: eax = handle (pointer to struc V86_machine) |
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34 | ; eax = NULL => failure |
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35 | ; destroys: ebx, ecx, edx (due to malloc) |
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36 | v86_create: |
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37 | ; allocate V86_machine structure |
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38 | mov eax, V86_machine.size |
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39 | call malloc |
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40 | test eax, eax |
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41 | jz .fail |
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42 | ; initialize mutex |
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43 | and dword [eax+V86_machine.mutex], 0 |
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44 | ; allocate tables |
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45 | mov ebx, eax |
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46 | ; We allocate 4 pages. |
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47 | ; First is main page directory for V86 mode. |
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48 | ; Second page: |
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49 | ; first half (0x800 bytes) is page table for addresses 0 - 0x100000, |
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50 | ; second half is for V86-to-linear translation. |
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51 | ; Third and fourth are for I/O permission map. |
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724 | diamond | 52 | push 8000h ; blocks less than 8 pages are discontinuous |
709 | diamond | 53 | call kernel_alloc |
54 | test eax, eax |
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55 | jz .fail2 |
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56 | mov [ebx+V86_machine.pagedir], eax |
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57 | push edi eax |
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58 | mov edi, eax |
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59 | add eax, 1800h |
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60 | mov [ebx+V86_machine.pages], eax |
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61 | ; initialize tables |
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62 | mov ecx, 2000h/4 |
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63 | xor eax, eax |
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64 | rep stosd |
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65 | mov [ebx+V86_machine.iopm], edi |
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66 | dec eax |
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67 | mov ecx, 2000h/4 |
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68 | rep stosd |
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69 | pop eax |
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70 | ; page directory: first entry is page table... |
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71 | mov edi, eax |
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72 | add eax, 1000h |
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73 | push eax |
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74 | call get_pg_addr |
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75 | or al, PG_UW |
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76 | stosd |
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77 | ; ...and also copy system page tables |
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78 | ; thx to Serge, system is located at high addresses |
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79 | add edi, (OS_BASE shr 20) - 4 |
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80 | push esi |
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81 | mov esi, (OS_BASE shr 20) + sys_pgdir |
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82 | mov ecx, 0x80000000 shr 22 |
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83 | rep movsd |
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712 | serge | 84 | |
85 | mov eax, [ebx+V86_machine.pagedir] ;root dir also is |
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86 | call get_pg_addr ;used as page table |
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87 | or al, PG_SW |
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88 | mov [edi-4096+(page_tabs shr 20)], eax |
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89 | |||
709 | diamond | 90 | pop esi |
91 | ; now V86 specific: initialize known addresses in first Mb |
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820 | diamond | 92 | pop eax |
709 | diamond | 93 | ; first page - BIOS data (shared between all machines!) |
94 | ; physical address = 0x2f0000 |
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95 | ; linear address = BOOT_VAR = OS_BASE + 0x2f0000 |
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96 | mov dword [eax], (BOOT_VAR - OS_BASE) or 111b |
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97 | mov dword [eax+800h], BOOT_VAR |
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98 | ; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!) |
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820 | diamond | 99 | ; physical address = 0x9C000 |
100 | ; linear address = 0x8009C000 |
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101 | ; (I have seen one computer with EBDA segment = 0x9D80, |
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102 | ; all other computers use less memory) |
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103 | mov ecx, 4 |
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104 | mov edx, 0x9C000 |
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105 | push eax |
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106 | lea edi, [eax+0x9C*4] |
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107 | @@: |
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108 | lea eax, [edx + OS_BASE] |
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109 | mov [edi+800h], eax |
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110 | lea eax, [edx + 111b] |
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111 | stosd |
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891 | diamond | 112 | add edx, 0x1000 |
820 | diamond | 113 | loop @b |
114 | pop eax |
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115 | pop edi |
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709 | diamond | 116 | ; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!) |
117 | ; physical address = 0xC0000 |
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118 | ; linear address = 0x800C0000 |
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119 | mov ecx, 0xC0 |
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120 | @@: |
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121 | mov edx, ecx |
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122 | shl edx, 12 |
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123 | push edx |
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124 | or edx, 101b |
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125 | mov [eax+ecx*4], edx |
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126 | pop edx |
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127 | add edx, OS_BASE |
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128 | mov [eax+ecx*4+0x800], edx |
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129 | inc cl |
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130 | jnz @b |
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131 | mov eax, ebx |
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132 | ret |
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133 | .fail2: |
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134 | mov eax, ebx |
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135 | call free |
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136 | .fail: |
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137 | xor eax, eax |
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138 | ret |
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139 | |||
140 | ; Destroy V86 machine |
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141 | ; in: eax = handle |
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142 | ; out: nothing |
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143 | ; destroys: eax, ebx, ecx, edx (due to free) |
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144 | v86_destroy: |
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145 | push eax |
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146 | stdcall kernel_free, [eax+V86_machine.pagedir] |
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147 | pop eax |
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148 | jmp free |
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149 | |||
150 | ; Translate V86-address to linear address |
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151 | ; in: eax=V86 address |
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152 | ; esi=handle |
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153 | ; out: eax=linear address |
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154 | ; destroys: nothing |
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155 | v86_get_lin_addr: |
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156 | push ecx edx |
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157 | mov ecx, eax |
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158 | mov edx, [esi+V86_machine.pages] |
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159 | shr ecx, 12 |
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160 | and eax, 0xFFF |
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161 | add eax, [edx+ecx*4] ; atomic operation, no mutex needed |
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162 | pop edx ecx |
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163 | ret |
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164 | |||
165 | ; Sets linear address for V86-page |
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166 | ; in: eax=linear address (must be page-aligned) |
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167 | ; ecx=V86 page (NOT address!) |
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168 | ; esi=handle |
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169 | ; out: nothing |
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170 | ; destroys: nothing |
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171 | v86_set_page: |
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172 | push eax ebx |
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173 | mov ebx, [esi+V86_machine.pagedir] |
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174 | mov [ebx+ecx*4+0x1800], eax |
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175 | call get_pg_addr |
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176 | or al, 111b |
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177 | mov [ebx+ecx*4+0x1000], eax |
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178 | pop ebx eax |
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179 | ret |
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180 | |||
181 | ; Allocate memory in V86 machine |
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182 | ; in: eax=size (in bytes) |
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183 | ; esi=handle |
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184 | ; out: eax=V86 address, para-aligned (0x10 multiple) |
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185 | ; destroys: nothing |
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724 | diamond | 186 | ; недописана!!! |
709 | diamond | 187 | ;v86_alloc: |
188 | ; push ebx ecx edx edi |
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189 | ; lea ebx, [esi+V86_machine.mutex] |
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190 | ; call wait_mutex |
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191 | ; add eax, 0x1F |
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192 | ; shr eax, 4 |
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193 | ; mov ebx, 0x1000 ; start with address 0x1000 (second page) |
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194 | ; mov edi, [esi+V86_machine.tables] |
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195 | ;.l: |
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196 | ; mov ecx, ebx |
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197 | ; shr ecx, 12 |
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198 | ; mov edx, [edi+0x1000+ecx*4] ; get linear address |
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199 | ; test edx, edx ; page allocated? |
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200 | ; jz .unalloc |
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201 | ; mov ecx, ebx |
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202 | ; and ecx, 0xFFF |
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203 | ; add edx, ecx |
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204 | ; cmp dword [edx], 0 ; free block? |
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205 | ; jnz .n |
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724 | diamond | 206 | ; cmp dword [edx+4], |
709 | diamond | 207 | ; and [esi+V86_machine.mutex], 0 |
208 | ; pop edi edx ecx ebx |
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209 | ; ret |
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210 | |||
211 | uglobal |
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212 | sys_v86_machine dd ? |
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213 | endg |
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214 | |||
215 | ; Called from kernel.asm at first stages of loading |
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216 | ; Initialize system V86 machine (used to simulate BIOS int 13h) |
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217 | init_sys_v86: |
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218 | call v86_create |
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219 | mov [sys_v86_machine], eax |
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220 | test eax, eax |
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221 | jz .ret |
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222 | mov byte [BOOT_VAR + 0x500], 0xCD |
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223 | mov byte [BOOT_VAR + 0x501], 0x13 |
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224 | mov byte [BOOT_VAR + 0x502], 0xF4 |
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225 | mov byte [BOOT_VAR + 0x503], 0xCD |
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226 | mov byte [BOOT_VAR + 0x504], 0x10 |
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227 | mov byte [BOOT_VAR + 0x505], 0xF4 |
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228 | mov esi, eax |
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229 | mov ebx, [eax+V86_machine.pagedir] |
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820 | diamond | 230 | ; one page for stack, two pages for results (0x2000 bytes = 16 sectors) |
231 | mov dword [ebx+0x99*4+0x1000], 0x99000 or 111b |
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232 | mov dword [ebx+0x99*4+0x1800], OS_BASE + 0x99000 |
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233 | mov dword [ebx+0x9A*4+0x1000], 0x9A000 or 111b |
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234 | mov dword [ebx+0x9A*4+0x1800], OS_BASE + 0x9A000 |
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770 | diamond | 235 | mov dword [ebx+0x9B*4+0x1000], 0x9B000 or 111b |
236 | mov dword [ebx+0x9B*4+0x1800], OS_BASE + 0x9B000 |
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709 | diamond | 237 | if ~DEBUG_SHOW_IO |
238 | ; allow access to all ports |
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239 | mov ecx, [esi+V86_machine.iopm] |
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240 | xor eax, eax |
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241 | mov edi, ecx |
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242 | mov ecx, 10000h/8/4 |
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243 | rep stosd |
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244 | end if |
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245 | .ret: |
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246 | ret |
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247 | |||
248 | struc v86_regs |
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249 | { |
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250 | ; don't change the order, it is important |
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251 | .edi dd ? |
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252 | .esi dd ? |
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253 | .ebp dd ? |
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254 | dd ? ; ignored |
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255 | .ebx dd ? |
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256 | .edx dd ? |
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257 | .ecx dd ? |
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258 | .eax dd ? |
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259 | .eip dd ? |
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260 | .cs dd ? |
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261 | .eflags dd ? ; VM flag must be set! |
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262 | .esp dd ? |
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263 | .ss dd ? |
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264 | .es dd ? |
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265 | .ds dd ? |
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266 | .fs dd ? |
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267 | .gs dd ? |
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268 | .size = $ |
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269 | } |
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270 | virtual at 0 |
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271 | v86_regs v86_regs |
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272 | end virtual |
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273 | |||
274 | ; Run V86 machine |
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275 | ; in: ebx -> registers for V86 (two structures: in and out) |
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276 | ; esi = handle |
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277 | ; ecx = expected end address (CS:IP) |
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278 | ; edx = IRQ to hook or -1 if not required |
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279 | ; out: structure pointed to by ebx is filled with new values |
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280 | ; eax = 1 - exception has occured, cl contains code |
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281 | ; eax = 2 - access to disabled i/o port, ecx contains port address |
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282 | ; eax = 3 - IRQ is already hooked by another VM |
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283 | ; destroys: nothing |
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284 | v86_start: |
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285 | pushad |
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286 | |||
287 | cli |
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288 | |||
289 | mov ecx, [CURRENT_TASK] |
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290 | shl ecx, 8 |
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291 | add ecx, SLOT_BASE |
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292 | |||
293 | mov eax, [esi+V86_machine.iopm] |
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294 | call get_pg_addr |
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295 | inc eax |
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296 | push dword [ecx+APPDATA.io_map] |
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297 | push dword [ecx+APPDATA.io_map+4] |
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298 | mov dword [ecx+APPDATA.io_map], eax |
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299 | mov dword [page_tabs + (tss._io_map_0 shr 10)], eax |
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300 | add eax, 0x1000 |
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301 | mov dword [ecx+APPDATA.io_map+4], eax |
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302 | mov dword [page_tabs + (tss._io_map_1 shr 10)], eax |
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303 | |||
304 | push [ecx+APPDATA.dir_table] |
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305 | push [ecx+APPDATA.saved_esp0] |
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306 | mov [ecx+APPDATA.saved_esp0], esp |
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307 | mov [tss._esp0], esp |
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308 | |||
309 | mov eax, [esi+V86_machine.pagedir] |
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310 | call get_pg_addr |
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311 | mov [ecx+APPDATA.dir_table], eax |
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312 | mov cr3, eax |
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313 | |||
314 | ; mov [irq_tab+5*4], my05 |
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315 | |||
316 | ; We do not enable interrupts, because V86 IRQ redirector assumes that |
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317 | ; machine is running |
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318 | ; They will be enabled by IRET. |
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319 | ; sti |
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320 | |||
321 | mov eax, esi |
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322 | sub esp, v86_regs.size |
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323 | mov esi, ebx |
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324 | mov edi, esp |
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325 | mov ecx, v86_regs.size/4 |
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326 | rep movsd |
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327 | |||
328 | cmp edx, -1 |
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329 | jz .noirqhook |
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330 | uglobal |
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331 | v86_irqhooks rd 16*2 |
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332 | endg |
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333 | cmp [v86_irqhooks+edx*8], 0 |
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334 | jz @f |
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335 | cmp [v86_irqhooks+edx*8], eax |
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336 | jz @f |
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337 | mov esi, v86_irqerr |
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338 | call sys_msg_board_str |
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339 | inc [v86_irqhooks+edx*8+4] |
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340 | mov eax, 3 |
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341 | jmp v86_exc_c.exit |
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342 | @@: |
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343 | mov [v86_irqhooks+edx*8], eax |
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344 | inc [v86_irqhooks+edx*8+4] |
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345 | .noirqhook: |
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346 | |||
347 | popad |
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348 | iretd |
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349 | |||
350 | ; It is only possible to leave virtual-8086 mode by faulting to |
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351 | ; a protected-mode interrupt handler (typically the general-protection |
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352 | ; exception handler, which in turn calls the virtual 8086-mode monitor). |
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353 | |||
354 | v86_debug_exc: |
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355 | pushad |
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356 | xor eax, eax |
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357 | mov dr6, eax |
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358 | mov bl, 1 |
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359 | jmp v86_exc_c |
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360 | |||
361 | v86_page_fault: |
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362 | add esp, 4 |
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363 | pushad |
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364 | mov bl, 14 |
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365 | jmp v86_exc_c |
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366 | |||
367 | v86_except_16: |
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368 | pushad |
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369 | mov bl, 16 |
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370 | jmp v86_exc_c |
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371 | v86_except_19: |
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372 | pushad |
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373 | mov bl, 19 |
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374 | |||
375 | iglobal |
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376 | v86_exc_str1 db 'V86 : unexpected exception ',0 |
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377 | v86_exc_str2 db ' at ',0 |
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378 | v86_exc_str3 db ':',0 |
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379 | v86_exc_str4 db 13,10,'V86 : faulted code:',0 |
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380 | v86_exc_str5 db ' (unavailable)',0 |
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381 | v86_newline db 13,10,0 |
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382 | v86_io_str1 db 'V86 : access to disabled i/o port ',0 |
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383 | v86_io_byte db ' (byte)',13,10,0 |
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384 | v86_io_word db ' (word)',13,10,0 |
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385 | v86_io_dword db ' (dword)',13,10,0 |
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386 | v86_irqerr db 'V86 : IRQ already hooked',13,10,0 |
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387 | endg |
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388 | |||
389 | v86_exc_c: |
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390 | mov ax, app_data |
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391 | mov ds, ax |
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392 | mov es, ax |
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393 | ; Did we all that we have wanted to do? |
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394 | mov eax, [esp+v86_regs.size+10h+18h] |
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395 | cmp word [esp+v86_regs.eip], ax |
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396 | jnz @f |
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397 | shr eax, 16 |
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398 | cmp word [esp+v86_regs.cs], ax |
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399 | jz .done |
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400 | @@: |
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401 | ; Various system events, which must be handled, result in #GP |
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402 | cmp bl, 13 |
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403 | jnz .nogp |
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404 | ; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error |
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405 | cmp word [esp+v86_regs.eip+2], 0 |
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406 | jnz .nogp |
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407 | ; Otherwise we can safely access byte at CS:IP |
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408 | ; (because it is #GP, not #PF handler) |
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724 | diamond | 409 | ; Если бы мы могли схлопотать исключение только из-за чтения байтов кода, |
410 | ; мы бы его уже схлопотали и это было бы не #GP |
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709 | diamond | 411 | movzx esi, word [esp+v86_regs.cs] |
412 | shl esi, 4 |
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413 | add esi, [esp+v86_regs.eip] |
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414 | lodsb |
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415 | cmp al, 0xCD ; int xx command = CD xx |
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416 | jz .handle_int |
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417 | cmp al, 0xCF |
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418 | jz .handle_iret |
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419 | cmp al, 0xF3 |
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420 | jz .handle_rep |
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421 | cmp al, 0xEC |
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422 | jz .handle_in |
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423 | cmp al, 0xED |
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424 | jz .handle_in_word |
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425 | cmp al, 0xEE |
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426 | jz .handle_out |
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427 | cmp al, 0xEF |
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428 | jz .handle_out_word |
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429 | cmp al, 0xE4 |
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430 | jz .handle_in_imm |
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431 | cmp al, 0xE6 |
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432 | jz .handle_out_imm |
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433 | cmp al, 0x9C |
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434 | jz .handle_pushf |
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435 | cmp al, 0x9D |
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436 | jz .handle_popf |
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437 | cmp al, 0xFA |
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438 | jz .handle_cli |
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439 | cmp al, 0xFB |
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440 | jz .handle_sti |
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441 | cmp al, 0x66 |
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442 | jz .handle_66 |
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443 | jmp .nogp |
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444 | .handle_int: |
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445 | cmp word [esp+v86_regs.eip], 0xFFFF |
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446 | jae .nogp |
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447 | xor eax, eax |
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448 | lodsb |
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449 | ; call sys_msg_board_byte |
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450 | ; simulate INT command |
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451 | ; N.B. It is possible that some checks need to be corrected, |
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452 | ; but at least in case of normal execution the code works. |
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453 | .simulate_int: |
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454 | cmp word [esp+v86_regs.esp], 6 |
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455 | jae @f |
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456 | mov bl, 12 ; #SS exception |
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457 | jmp .nogp |
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458 | @@: |
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459 | movzx edx, word [esp+v86_regs.ss] |
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460 | shl edx, 4 |
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461 | push eax |
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462 | movzx eax, word [esp+4+v86_regs.esp] |
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463 | sub eax, 6 |
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464 | add edx, eax |
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465 | mov eax, edx |
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466 | mov esi, [esp+4+v86_regs.size+10h+4] |
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467 | call v86_get_lin_addr |
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468 | cmp eax, 0x1000 |
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469 | jae @f |
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470 | mov bl, 14 ; #PF exception |
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471 | jmp .nogp |
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472 | @@: |
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473 | lea eax, [edx+5] |
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474 | call v86_get_lin_addr |
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475 | cmp eax, 0x1000 |
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476 | jae @f |
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477 | mov bl, 14 ; #PF exception |
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478 | jmp .nogp |
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479 | @@: |
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480 | sub word [esp+4+v86_regs.esp], 6 |
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481 | mov eax, [esp+4+v86_regs.eip] |
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971 | diamond | 482 | cmp byte [esp+1], 0 |
483 | jnz @f |
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709 | diamond | 484 | inc eax |
485 | inc eax |
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971 | diamond | 486 | @@: |
709 | diamond | 487 | mov word [edx], ax |
488 | mov eax, [esp+4+v86_regs.cs] |
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489 | mov word [edx+2], ax |
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490 | mov eax, [esp+4+v86_regs.eflags] |
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491 | mov word [edx+4], ax |
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492 | pop eax |
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971 | diamond | 493 | mov ah, 0 |
709 | diamond | 494 | mov cx, [eax*4] |
495 | mov word [esp+v86_regs.eip], cx |
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496 | mov cx, [eax*4+2] |
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497 | mov word [esp+v86_regs.cs], cx |
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498 | ; note that interrupts will be disabled globally at IRET |
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499 | and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags |
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500 | ; continue V86 execution |
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501 | popad |
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502 | iretd |
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503 | .handle_iret: |
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504 | cmp word [esp+v86_regs.esp], 0x10000 - 6 |
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505 | jbe @f |
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506 | mov bl, 12 |
||
507 | jmp .nogp |
||
508 | @@: |
||
509 | movzx edx, word [esp+v86_regs.ss] |
||
510 | shl edx, 4 |
||
511 | movzx eax, word [esp+v86_regs.esp] |
||
512 | add edx, eax |
||
513 | mov eax, edx |
||
514 | mov esi, [esp+v86_regs.size+10h+4] |
||
515 | call v86_get_lin_addr |
||
516 | cmp eax, 0x1000 |
||
517 | jae @f |
||
518 | mov bl, 14 |
||
519 | jmp .nogp |
||
520 | @@: |
||
521 | lea eax, [edx+5] |
||
522 | call v86_get_lin_addr |
||
523 | cmp eax, 0x1000 |
||
524 | jae @f |
||
525 | mov bl, 14 |
||
526 | jmp .nogp |
||
527 | @@: |
||
528 | mov ax, [edx] |
||
529 | mov word [esp+v86_regs.eip], ax |
||
530 | mov ax, [edx+2] |
||
531 | mov word [esp+v86_regs.cs], ax |
||
532 | mov ax, [edx+4] |
||
533 | mov word [esp+v86_regs.eflags], ax |
||
534 | add word [esp+v86_regs.esp], 6 |
||
535 | popad |
||
536 | iretd |
||
537 | .handle_pushf: |
||
538 | cmp word [esp+v86_regs.esp], 1 |
||
539 | jnz @f |
||
540 | mov bl, 12 |
||
541 | jmp .nogp |
||
542 | @@: |
||
543 | movzx edx, word [esp+v86_regs.ss] |
||
544 | shl edx, 4 |
||
545 | mov eax, [esp+v86_regs.esp] |
||
546 | sub eax, 2 |
||
547 | movzx eax, ax |
||
548 | add edx, eax |
||
549 | mov eax, edx |
||
550 | mov esi, [esp+v86_regs.size+10h+4] |
||
551 | call v86_get_lin_addr |
||
552 | cmp eax, 0x1000 |
||
553 | jae @f |
||
554 | mov bl, 14 ; #PF exception |
||
555 | jmp .nogp |
||
556 | @@: |
||
557 | lea eax, [edx+1] |
||
558 | call v86_get_lin_addr |
||
559 | cmp eax, 0x1000 |
||
560 | jae @f |
||
561 | mov bl, 14 |
||
562 | jmp .nogp |
||
563 | @@: |
||
564 | sub word [esp+v86_regs.esp], 2 |
||
565 | mov eax, [esp+v86_regs.eflags] |
||
566 | mov [edx], ax |
||
567 | inc word [esp+v86_regs.eip] |
||
568 | popad |
||
569 | iretd |
||
770 | diamond | 570 | .handle_pushfd: |
571 | cmp word [esp+v86_regs.esp], 4 |
||
572 | jae @f |
||
573 | mov bl, 12 ; #SS exception |
||
574 | jmp .nogp |
||
575 | @@: |
||
576 | movzx edx, word [esp+v86_regs.ss] |
||
577 | shl edx, 4 |
||
578 | movzx eax, word [esp+v86_regs.esp] |
||
579 | sub eax, 4 |
||
580 | add edx, eax |
||
581 | mov eax, edx |
||
582 | mov esi, [esp+v86_regs.size+10h+4] |
||
583 | call v86_get_lin_addr |
||
584 | cmp eax, 0x1000 |
||
585 | jae @f |
||
586 | mov bl, 14 ; #PF exception |
||
587 | jmp .nogp |
||
588 | @@: |
||
589 | lea eax, [edx+3] |
||
590 | call v86_get_lin_addr |
||
591 | cmp eax, 0x1000 |
||
592 | jae @f |
||
593 | mov bl, 14 ; #PF exception |
||
594 | jmp .nogp |
||
595 | @@: |
||
596 | sub word [esp+v86_regs.esp], 4 |
||
597 | movzx eax, word [esp+v86_regs.eflags] |
||
598 | mov [edx], eax |
||
599 | add word [esp+v86_regs.eip], 2 |
||
600 | popad |
||
601 | iretd |
||
709 | diamond | 602 | .handle_popf: |
603 | cmp word [esp+v86_regs.esp], 0xFFFF |
||
604 | jnz @f |
||
605 | mov bl, 12 |
||
606 | jmp .nogp |
||
607 | @@: |
||
608 | movzx edx, word [esp+v86_regs.ss] |
||
609 | shl edx, 4 |
||
610 | movzx eax, word [esp+v86_regs.esp] |
||
611 | add edx, eax |
||
612 | mov eax, edx |
||
613 | mov esi, [esp+v86_regs.size+10h+4] |
||
614 | call v86_get_lin_addr |
||
615 | cmp eax, 0x1000 |
||
616 | jae @f |
||
617 | mov bl, 14 ; #PF exception |
||
618 | jmp .nogp |
||
619 | @@: |
||
620 | lea eax, [edx+1] |
||
621 | call v86_get_lin_addr |
||
622 | cmp eax, 0x1000 |
||
623 | jae @f |
||
624 | mov bl, 14 |
||
625 | jmp .nogp |
||
626 | @@: |
||
627 | mov ax, [edx] |
||
628 | mov word [esp+v86_regs.eflags], ax |
||
629 | add word [esp+v86_regs.esp], 2 |
||
630 | inc word [esp+v86_regs.eip] |
||
631 | popad |
||
632 | iretd |
||
770 | diamond | 633 | .handle_popfd: |
634 | cmp word [esp+v86_regs.esp], 0x10000 - 4 |
||
635 | jbe @f |
||
636 | mov bl, 12 |
||
637 | jmp .nogp |
||
638 | @@: |
||
639 | movzx edx, word [esp+v86_regs.ss] |
||
640 | shl edx, 4 |
||
641 | movzx eax, word [esp+v86_regs.esp] |
||
642 | add edx, eax |
||
643 | mov eax, edx |
||
644 | mov esi, [esp+v86_regs.size+10h+4] |
||
645 | call v86_get_lin_addr |
||
646 | cmp eax, 0x1000 |
||
647 | jae @f |
||
648 | mov bl, 14 |
||
649 | jmp .nogp |
||
650 | @@: |
||
651 | lea eax, [edx+3] |
||
652 | call v86_get_lin_addr |
||
653 | cmp eax, 0x1000 |
||
654 | jae @f |
||
655 | mov bl, 14 |
||
656 | jmp .nogp |
||
657 | @@: |
||
658 | mov eax, [edx] |
||
659 | mov word [esp+v86_regs.eflags], ax |
||
660 | add word [esp+v86_regs.esp], 4 |
||
661 | add word [esp+v86_regs.eip], 2 |
||
662 | popad |
||
663 | iretd |
||
709 | diamond | 664 | .handle_cli: |
665 | and byte [esp+v86_regs.eflags+1], not 2 |
||
666 | inc word [esp+v86_regs.eip] |
||
667 | popad |
||
668 | iretd |
||
669 | .handle_sti: |
||
670 | or byte [esp+v86_regs.eflags+1], 2 |
||
671 | inc word [esp+v86_regs.eip] |
||
672 | popad |
||
673 | iretd |
||
674 | .handle_rep: |
||
675 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
676 | jae .nogp |
||
677 | lodsb |
||
678 | cmp al, 6Eh |
||
679 | jz .handle_rep_outsb |
||
680 | jmp .nogp |
||
681 | .handle_rep_outsb: |
||
682 | .handle_in: |
||
683 | .handle_out: |
||
684 | .invalid_io_byte: |
||
685 | movzx ebx, word [esp+v86_regs.edx] |
||
686 | mov ecx, 1 |
||
687 | jmp .invalid_io |
||
688 | .handle_in_imm: |
||
689 | .handle_out_imm: |
||
690 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
691 | jae .nogp |
||
692 | lodsb |
||
693 | movzx ebx, al |
||
694 | mov ecx, 1 |
||
695 | jmp .invalid_io |
||
696 | .handle_66: |
||
697 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
698 | jae .nogp |
||
699 | lodsb |
||
770 | diamond | 700 | cmp al, 0x9C |
701 | jz .handle_pushfd |
||
702 | cmp al, 0x9D |
||
703 | jz .handle_popfd |
||
709 | diamond | 704 | cmp al, 0xEF |
705 | jz .handle_out_dword |
||
706 | cmp al, 0xED |
||
707 | jz .handle_in_dword |
||
708 | jmp .nogp |
||
709 | .handle_in_word: |
||
710 | .handle_out_word: |
||
711 | movzx ebx, word [esp+v86_regs.edx] |
||
712 | mov ecx, 2 |
||
713 | jmp .invalid_io |
||
714 | .handle_in_dword: |
||
715 | .handle_out_dword: |
||
716 | .invalid_io_dword: |
||
717 | movzx ebx, word [esp+v86_regs.edx] |
||
718 | mov ecx, 4 |
||
719 | .invalid_io: |
||
720 | mov esi, v86_io_str1 |
||
721 | call sys_msg_board_str |
||
722 | mov eax, ebx |
||
723 | call sys_msg_board_dword |
||
724 | mov esi, v86_io_byte |
||
725 | cmp ecx, 1 |
||
726 | jz @f |
||
727 | mov esi, v86_io_word |
||
728 | cmp ecx, 2 |
||
729 | jz @f |
||
730 | mov esi, v86_io_dword |
||
731 | @@: |
||
732 | call sys_msg_board_str |
||
733 | if DEBUG_SHOW_IO |
||
734 | mov edx, ebx |
||
735 | mov ebx, 200 |
||
736 | call delay_hs |
||
737 | mov esi, [esp+v86_regs.size+10h+4] |
||
738 | mov eax, [esi+V86_machine.iopm] |
||
739 | @@: |
||
740 | btr [eax], edx |
||
741 | inc edx |
||
742 | loop @b |
||
743 | popad |
||
744 | iretd |
||
745 | else |
||
746 | mov eax, 2 |
||
747 | jmp .exit |
||
748 | end if |
||
749 | .nogp: |
||
750 | |||
751 | mov esi, v86_exc_str1 |
||
752 | call sys_msg_board_str |
||
753 | mov al, bl |
||
754 | call sys_msg_board_byte |
||
755 | mov esi, v86_exc_str2 |
||
756 | call sys_msg_board_str |
||
757 | mov ax, [esp+32+4] |
||
758 | call sys_msg_board_word |
||
759 | mov esi, v86_exc_str3 |
||
760 | call sys_msg_board_str |
||
761 | mov ax, [esp+32] |
||
762 | call sys_msg_board_word |
||
763 | mov esi, v86_exc_str4 |
||
764 | call sys_msg_board_str |
||
765 | mov ecx, 8 |
||
766 | movzx edx, word [esp+32+4] |
||
767 | shl edx, 4 |
||
768 | add edx, [esp+32] |
||
769 | @@: |
||
770 | mov esi, [esp+v86_regs.size+10h+4] |
||
771 | mov eax, edx |
||
772 | call v86_get_lin_addr |
||
773 | cmp eax, 0x1000 |
||
774 | jb .nopage |
||
775 | mov esi, v86_exc_str3-2 |
||
776 | call sys_msg_board_str |
||
777 | mov al, [edx] |
||
778 | call sys_msg_board_byte |
||
779 | inc edx |
||
780 | loop @b |
||
781 | jmp @f |
||
782 | .nopage: |
||
783 | mov esi, v86_exc_str5 |
||
784 | call sys_msg_board_str |
||
785 | @@: |
||
786 | mov esi, v86_newline |
||
787 | call sys_msg_board_str |
||
788 | mov eax, 1 |
||
789 | jmp .exit |
||
790 | |||
791 | .done: |
||
792 | xor eax, eax |
||
793 | |||
794 | .exit: |
||
795 | mov [esp+v86_regs.size+10h+1Ch], eax |
||
796 | mov [esp+v86_regs.size+10h+18h], ebx |
||
797 | |||
798 | mov edx, [esp+v86_regs.size+10h+14h] |
||
799 | cmp edx, -1 |
||
800 | jz @f |
||
801 | dec [v86_irqhooks+edx*8+4] |
||
802 | jnz @f |
||
803 | and [v86_irqhooks+edx*8], 0 |
||
804 | @@: |
||
805 | |||
806 | mov esi, esp |
||
807 | mov edi, [esi+v86_regs.size+10h+10h] |
||
808 | add edi, v86_regs.size |
||
809 | mov ecx, v86_regs.size/4 |
||
810 | rep movsd |
||
811 | mov esp, esi |
||
812 | |||
813 | cli |
||
814 | mov ecx, [CURRENT_TASK] |
||
815 | shl ecx, 8 |
||
816 | pop eax |
||
817 | mov [SLOT_BASE+ecx+APPDATA.saved_esp0], eax |
||
818 | mov [tss._esp0], eax |
||
819 | pop eax |
||
820 | mov [SLOT_BASE+ecx+APPDATA.dir_table], eax |
||
821 | pop ebx |
||
822 | mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx |
||
823 | mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx |
||
824 | pop ebx |
||
825 | mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx |
||
826 | mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx |
||
827 | mov cr3, eax |
||
828 | ; mov [irq_tab+5*4], 0 |
||
829 | sti |
||
830 | |||
831 | popad |
||
832 | ret |
||
833 | |||
834 | ;my05: |
||
835 | ; mov dx, 30C2h |
||
836 | ; mov cx, 4 |
||
837 | ;.0: |
||
838 | ; in al, dx |
||
839 | ; cmp al, 0FFh |
||
840 | ; jz @f |
||
841 | ; test al, 4 |
||
842 | ; jnz .1 |
||
843 | ;@@: |
||
844 | ; add dx, 8 |
||
845 | ; in al, dx |
||
846 | ; cmp al, 0FFh |
||
847 | ; jz @f |
||
848 | ; test al, 4 |
||
849 | ; jnz .1 |
||
850 | ;@@: |
||
851 | ; loop .0 |
||
852 | ; ret |
||
853 | ;.1: |
||
854 | ; or al, 84h |
||
855 | ; out dx, al |
||
856 | ;.2: |
||
857 | ; mov dx, 30F7h |
||
858 | ; in al, dx |
||
859 | ; mov byte [BOOT_VAR + 48Eh], 0FFh |
||
860 | ; ret |
||
861 | |||
862 | v86_irq: |
||
785 | diamond | 863 | ; push irq/pushad/jmp v86_irq |
709 | diamond | 864 | ; eax = irq |
789 | diamond | 865 | lea esi, [esp+1Ch] |
709 | diamond | 866 | lea edi, [esi+4] |
785 | diamond | 867 | mov ecx, 8 |
709 | diamond | 868 | std |
869 | rep movsd |
||
870 | cld |
||
788 | diamond | 871 | mov edi, eax |
709 | diamond | 872 | pop eax |
960 | diamond | 873 | v86_irq2: |
709 | diamond | 874 | mov esi, [v86_irqhooks+edi*8] ; get VM handle |
875 | mov eax, [esi+V86_machine.pagedir] |
||
876 | call get_pg_addr |
||
877 | mov ecx, [CURRENT_TASK] |
||
878 | shl ecx, 8 |
||
879 | cmp [SLOT_BASE+ecx+APPDATA.dir_table], eax |
||
880 | jnz .notcurrent |
||
881 | lea eax, [edi+8] |
||
882 | cmp al, 10h |
||
971 | diamond | 883 | mov ah, 1 |
709 | diamond | 884 | jb @f |
724 | diamond | 885 | add al, 60h |
709 | diamond | 886 | @@: |
887 | jmp v86_exc_c.simulate_int |
||
888 | .notcurrent: |
||
889 | mov ebx, SLOT_BASE + 0x100 |
||
890 | mov ecx, [TASK_COUNT] |
||
891 | .scan: |
||
892 | cmp [ebx+APPDATA.dir_table], eax |
||
893 | jnz .cont |
||
894 | push ecx |
||
895 | mov ecx, [ebx+APPDATA.saved_esp0] |
||
896 | cmp word [ecx-v86_regs.size+v86_regs.esp], 6 |
||
897 | jb .cont2 |
||
898 | movzx edx, word [ecx-v86_regs.size+v86_regs.ss] |
||
899 | shl edx, 4 |
||
900 | push eax |
||
901 | movzx eax, word [ecx-v86_regs.size+v86_regs.esp] |
||
902 | sub eax, 6 |
||
903 | add edx, eax |
||
904 | mov eax, edx |
||
905 | call v86_get_lin_addr |
||
906 | cmp eax, 0x1000 |
||
907 | jb .cont3 |
||
908 | lea eax, [edx+5] |
||
909 | call v86_get_lin_addr |
||
910 | cmp eax, 0x1000 |
||
911 | jb .cont3 |
||
912 | pop eax |
||
913 | pop ecx |
||
914 | jmp .found |
||
915 | .cont3: |
||
916 | pop eax |
||
917 | .cont2: |
||
918 | pop ecx |
||
919 | .cont: |
||
920 | loop .scan |
||
921 | mov al, 20h |
||
922 | out 20h, al |
||
923 | cmp edi, 8 |
||
924 | jb @f |
||
925 | out 0A0h, al |
||
926 | @@: |
||
927 | popad |
||
928 | iretd |
||
929 | .found: |
||
930 | mov cr3, eax |
||
931 | sub word [esi-v86_regs.size+v86_regs.esp], 6 |
||
932 | mov ecx, [esi-v86_regs.size+v86_regs.eip] |
||
933 | mov word [edx], cx |
||
934 | mov ecx, [esi-v86_regs.size+v86_regs.cs] |
||
935 | mov word [edx+2], cx |
||
936 | mov ecx, [esi-v86_regs.size+v86_regs.eflags] |
||
937 | mov word [edx+4], cx |
||
938 | lea eax, [edi+8] |
||
939 | cmp al, 10h |
||
940 | jb @f |
||
724 | diamond | 941 | add al, 60h |
709 | diamond | 942 | @@: |
943 | mov cx, [eax*4] |
||
944 | mov word [esi-v86_regs.size+v86_regs.eip], cx |
||
945 | mov cx, [eax*4+2] |
||
946 | mov word [esi-v86_regs.size+v86_regs.cs], cx |
||
947 | and byte [esi-v86_regs.size+v86_regs.eflags+1], not 3 |
||
948 | push ebx |
||
949 | call update_counters |
||
950 | pop ebx |
||
951 | sub ebx, SLOT_BASE |
||
952 | shr ebx, 8 |
||
953 | mov esi, [CURRENT_TASK] |
||
954 | call do_change_task |
||
955 | popad |
||
956 | iretd |