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Rev | Author | Line No. | Line |
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4429 | Serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2007-2012. 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 | $Revision: 3696 $ |
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9 | |||
10 | ; Virtual-8086 mode manager |
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11 | ; diamond, 2007, 2008 |
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12 | |||
13 | DEBUG_SHOW_IO = 0 |
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14 | |||
15 | struct V86_machine |
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16 | ; page directory |
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4993 | Serge | 17 | process dd ? |
4429 | Serge | 18 | ; mutex to protect all data from writing by multiple threads at one time |
19 | mutex dd ? |
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20 | ; i/o permission map |
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21 | iopm dd ? |
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22 | ends |
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23 | |||
24 | ; Create V86 machine |
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25 | ; in: nothing |
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26 | ; out: eax = handle (pointer to struc V86_machine) |
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27 | ; eax = NULL => failure |
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28 | ; destroys: ebx, ecx, edx (due to malloc) |
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29 | v86_create: |
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30 | ; allocate V86_machine structure |
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31 | mov eax, sizeof.V86_machine |
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32 | call malloc |
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33 | test eax, eax |
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34 | jz .fail |
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35 | ; initialize mutex |
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36 | and dword [eax+V86_machine.mutex], 0 |
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37 | ; allocate tables |
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38 | mov ebx, eax |
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4993 | Serge | 39 | |
40 | stdcall create_process, 4096, OS_BASE, 4096 |
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41 | test eax, eax |
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42 | jz .fail2 |
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43 | |||
44 | mov [eax+PROC.mem_used], 4096 |
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45 | mov [ebx+V86_machine.process], eax |
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46 | |||
47 | push 2000h |
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4429 | Serge | 48 | call kernel_alloc |
49 | test eax, eax |
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50 | jz .fail2 |
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4993 | Serge | 51 | |
52 | mov [ebx+V86_machine.iopm], eax |
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53 | |||
54 | |||
55 | ; initialize tables |
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56 | push edi |
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4429 | Serge | 57 | mov edi, eax |
4993 | Serge | 58 | mov eax, -1 |
4429 | Serge | 59 | mov ecx, 2000h/4 |
60 | rep stosd |
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61 | |||
4993 | Serge | 62 | mov eax, [ebx+V86_machine.process] |
63 | mov eax, [eax+PROC.pdt_0_phys] |
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4429 | Serge | 64 | |
4993 | Serge | 65 | pushfd |
66 | cli |
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67 | mov cr3, eax |
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68 | |||
69 | |||
4429 | Serge | 70 | ; now V86 specific: initialize known addresses in first Mb |
4993 | Serge | 71 | |
4429 | Serge | 72 | ; first page - BIOS data (shared between all machines!) |
73 | ; physical address = 0 |
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74 | ; linear address = OS_BASE |
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75 | ; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!) |
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76 | ; physical address = 0x9C000 |
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77 | ; linear address = 0x8009C000 |
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78 | ; (I have seen one computer with EBDA segment = 0x9D80, |
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79 | ; all other computers use less memory) |
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4993 | Serge | 80 | |
81 | mov eax, PG_UW |
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82 | mov [page_tabs], eax |
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83 | invlpg [eax] |
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84 | |||
85 | mov byte [0x500], 0xCD |
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86 | mov byte [0x501], 0x13 |
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87 | mov byte [0x502], 0xF4 |
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88 | mov byte [0x503], 0xCD |
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89 | mov byte [0x504], 0x10 |
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90 | mov byte [0x505], 0xF4 |
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91 | |||
92 | mov eax, 0x99000+PG_UW |
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93 | mov edi, page_tabs+0x99*4 |
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94 | mov edx, 0x1000 |
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95 | mov ecx, 7 |
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4429 | Serge | 96 | @@: |
97 | stosd |
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4993 | Serge | 98 | add eax, edx |
99 | loop @b |
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100 | |||
4429 | Serge | 101 | ; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!) |
102 | ; physical address = 0xC0000 |
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4993 | Serge | 103 | |
104 | mov eax, 0xC0000+PG_UW |
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105 | mov edi, page_tabs+0xC0*4 |
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106 | mov ecx, 64 |
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4429 | Serge | 107 | @@: |
4993 | Serge | 108 | stosd |
109 | add eax, edx |
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110 | loop @b |
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111 | |||
112 | mov eax, sys_proc-OS_BASE+PROC.pdt_0 |
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113 | |||
114 | mov cr3, eax |
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115 | popfd |
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116 | |||
117 | pop edi |
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118 | |||
4429 | Serge | 119 | mov eax, ebx |
120 | ret |
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121 | .fail2: |
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122 | mov eax, ebx |
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123 | call free |
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124 | .fail: |
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125 | xor eax, eax |
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126 | ret |
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127 | |||
4993 | Serge | 128 | ;not used |
4429 | Serge | 129 | ; Destroy V86 machine |
130 | ; in: eax = handle |
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131 | ; out: nothing |
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132 | ; destroys: eax, ebx, ecx, edx (due to free) |
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4993 | Serge | 133 | ;v86_destroy: |
134 | ; push eax |
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135 | ; stdcall kernel_free, [eax+V86_machine.pagedir] |
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136 | ; pop eax |
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137 | ; jmp free |
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4429 | Serge | 138 | |
139 | ; Translate V86-address to linear address |
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140 | ; in: eax=V86 address |
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141 | ; esi=handle |
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142 | ; out: eax=linear address |
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143 | ; destroys: nothing |
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144 | v86_get_lin_addr: |
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145 | push ecx edx |
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146 | mov ecx, eax |
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147 | shr ecx, 12 |
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5120 | serge | 148 | mov edx, [page_tabs+ecx*4] |
4429 | Serge | 149 | and eax, 0xFFF |
5120 | serge | 150 | and edx, 0xFFFFF000 |
151 | or eax, edx |
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4429 | Serge | 152 | pop edx ecx |
153 | ret |
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154 | |||
4993 | Serge | 155 | ;not used |
4429 | Serge | 156 | ; Sets linear address for V86-page |
157 | ; in: eax=linear address (must be page-aligned) |
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158 | ; ecx=V86 page (NOT address!) |
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159 | ; esi=handle |
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160 | ; out: nothing |
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161 | ; destroys: nothing |
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4993 | Serge | 162 | ;v86_set_page: |
163 | ; push eax ebx |
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164 | ; mov ebx, [esi+V86_machine.pagedir] |
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165 | ; mov [ebx+ecx*4+0x1800], eax |
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166 | ; call get_pg_addr |
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167 | ; or al, 111b |
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168 | ; mov [ebx+ecx*4+0x1000], eax |
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169 | ; pop ebx eax |
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170 | ; ret |
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4429 | Serge | 171 | |
172 | ; Allocate memory in V86 machine |
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173 | ; in: eax=size (in bytes) |
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174 | ; esi=handle |
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175 | ; out: eax=V86 address, para-aligned (0x10 multiple) |
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176 | ; destroys: nothing |
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177 | ; недописана!!! |
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178 | ;v86_alloc: |
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179 | ; push ebx ecx edx edi |
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180 | ; lea ebx, [esi+V86_machine.mutex] |
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181 | ; call wait_mutex |
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182 | ; add eax, 0x1F |
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183 | ; shr eax, 4 |
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184 | ; mov ebx, 0x1000 ; start with address 0x1000 (second page) |
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185 | ; mov edi, [esi+V86_machine.tables] |
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186 | ;.l: |
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187 | ; mov ecx, ebx |
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188 | ; shr ecx, 12 |
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189 | ; mov edx, [edi+0x1000+ecx*4] ; get linear address |
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190 | ; test edx, edx ; page allocated? |
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191 | ; jz .unalloc |
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192 | ; mov ecx, ebx |
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193 | ; and ecx, 0xFFF |
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194 | ; add edx, ecx |
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195 | ; cmp dword [edx], 0 ; free block? |
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196 | ; jnz .n |
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197 | ; cmp dword [edx+4], |
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198 | ; and [esi+V86_machine.mutex], 0 |
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199 | ; pop edi edx ecx ebx |
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200 | ; ret |
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201 | |||
202 | uglobal |
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203 | sys_v86_machine dd ? |
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204 | endg |
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205 | |||
206 | ; Called from kernel.asm at first stages of loading |
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207 | ; Initialize system V86 machine (used to simulate BIOS int 13h) |
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208 | init_sys_v86: |
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209 | call v86_create |
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210 | mov [sys_v86_machine], eax |
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211 | test eax, eax |
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212 | jz .ret |
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213 | mov esi, eax |
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214 | if ~DEBUG_SHOW_IO |
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215 | ; allow access to all ports |
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216 | mov ecx, [esi+V86_machine.iopm] |
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217 | xor eax, eax |
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218 | mov edi, ecx |
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219 | mov ecx, 10000h/8/4 |
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220 | rep stosd |
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221 | end if |
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222 | .ret: |
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223 | ret |
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224 | |||
225 | struct v86_regs |
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226 | ; don't change the order, it is important |
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227 | edi dd ? |
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228 | esi dd ? |
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229 | ebp dd ? |
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230 | dd ? ; ignored |
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231 | ebx dd ? |
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232 | edx dd ? |
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233 | ecx dd ? |
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234 | eax dd ? |
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235 | eip dd ? |
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236 | cs dd ? |
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237 | eflags dd ? ; VM flag must be set! |
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238 | esp dd ? |
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239 | ss dd ? |
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240 | es dd ? |
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241 | ds dd ? |
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242 | fs dd ? |
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243 | gs dd ? |
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244 | ends |
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245 | |||
246 | ; Run V86 machine |
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247 | ; in: ebx -> registers for V86 (two structures: in and out) |
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248 | ; esi = handle |
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249 | ; ecx = expected end address (CS:IP) |
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250 | ; edx = IRQ to hook or -1 if not required |
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251 | ; out: structure pointed to by ebx is filled with new values |
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252 | ; eax = 1 - exception has occured, cl contains code |
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253 | ; eax = 2 - access to disabled i/o port, ecx contains port address |
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254 | ; eax = 3 - IRQ is already hooked by another VM |
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255 | ; destroys: nothing |
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256 | v86_start: |
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4993 | Serge | 257 | |
4429 | Serge | 258 | pushad |
259 | |||
260 | cli |
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261 | |||
5120 | serge | 262 | mov ecx, [current_slot] |
4429 | Serge | 263 | |
5120 | serge | 264 | push dword [ecx+APPDATA.io_map] |
265 | push dword [ecx+APPDATA.io_map+4] |
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266 | push [ecx+APPDATA.process] |
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267 | push [ecx+APPDATA.saved_esp0] |
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268 | mov [ecx+APPDATA.saved_esp0], esp |
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269 | mov [tss._esp0], esp |
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270 | |||
4429 | Serge | 271 | mov eax, [esi+V86_machine.iopm] |
272 | call get_pg_addr |
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273 | inc eax |
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274 | mov dword [ecx+APPDATA.io_map], eax |
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275 | mov dword [page_tabs + (tss._io_map_0 shr 10)], eax |
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5120 | serge | 276 | |
277 | mov eax, [esi+V86_machine.iopm] |
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4429 | Serge | 278 | add eax, 0x1000 |
5120 | serge | 279 | call get_pg_addr |
280 | inc eax |
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4429 | Serge | 281 | mov dword [ecx+APPDATA.io_map+4], eax |
282 | mov dword [page_tabs + (tss._io_map_1 shr 10)], eax |
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283 | |||
4993 | Serge | 284 | mov eax, [esi+V86_machine.process] |
4429 | Serge | 285 | mov [ecx+APPDATA.process], eax |
5120 | serge | 286 | mov [current_process], eax |
4993 | Serge | 287 | mov eax, [eax+PROC.pdt_0_phys] |
288 | mov cr3, eax |
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4429 | Serge | 289 | |
290 | ; We do not enable interrupts, because V86 IRQ redirector assumes that |
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291 | ; machine is running |
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292 | ; They will be enabled by IRET. |
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293 | ; sti |
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294 | |||
295 | mov eax, esi |
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296 | sub esp, sizeof.v86_regs |
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297 | mov esi, ebx |
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298 | mov edi, esp |
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299 | mov ecx, sizeof.v86_regs/4 |
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300 | rep movsd |
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301 | |||
302 | cmp edx, -1 |
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303 | jz .noirqhook |
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304 | uglobal |
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305 | v86_irqhooks rd IRQ_RESERVED * 2 |
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306 | endg |
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307 | cmp [v86_irqhooks+edx*8], 0 |
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308 | jz @f |
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309 | cmp [v86_irqhooks+edx*8], eax |
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310 | jz @f |
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311 | mov esi, v86_irqerr |
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312 | call sys_msg_board_str |
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313 | inc [v86_irqhooks+edx*8+4] |
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314 | mov eax, 3 |
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315 | jmp v86_exc_c.exit |
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316 | @@: |
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317 | mov [v86_irqhooks+edx*8], eax |
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318 | inc [v86_irqhooks+edx*8+4] |
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319 | .noirqhook: |
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320 | |||
321 | popad |
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322 | iretd |
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323 | |||
324 | ; It is only possible to leave virtual-8086 mode by faulting to |
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325 | ; a protected-mode interrupt handler (typically the general-protection |
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326 | ; exception handler, which in turn calls the virtual 8086-mode monitor). |
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327 | |||
328 | iglobal |
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329 | v86_exc_str1 db 'V86 : unexpected exception ',0 |
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330 | v86_exc_str2 db ' at ',0 |
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331 | v86_exc_str3 db ':',0 |
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332 | v86_exc_str4 db 13,10,'V86 : faulted code:',0 |
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333 | v86_exc_str5 db ' (unavailable)',0 |
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334 | v86_newline db 13,10,0 |
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335 | v86_io_str1 db 'V86 : access to disabled i/o port ',0 |
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336 | v86_io_byte db ' (byte)',13,10,0 |
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337 | v86_io_word db ' (word)',13,10,0 |
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338 | v86_io_dword db ' (dword)',13,10,0 |
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339 | v86_irqerr db 'V86 : IRQ already hooked',13,10,0 |
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340 | endg |
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341 | |||
342 | v86_exc_c: |
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343 | ; Did we all that we have wanted to do? |
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344 | cmp bl, 1 |
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345 | jne @f |
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346 | xor eax, eax |
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347 | mov dr6, eax |
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348 | @@: |
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349 | mov eax, [esp+sizeof.v86_regs+10h+18h] |
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350 | cmp word [esp+v86_regs.eip], ax |
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351 | jnz @f |
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352 | shr eax, 16 |
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353 | cmp word [esp+v86_regs.cs], ax |
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354 | jz .done |
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355 | @@: |
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356 | ; Various system events, which must be handled, result in #GP |
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357 | cmp bl, 13 |
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358 | jnz .nogp |
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359 | ; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error |
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360 | cmp word [esp+v86_regs.eip+2], 0 |
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361 | jnz .nogp |
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362 | ; Otherwise we can safely access byte at CS:IP |
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363 | ; (because it is #GP, not #PF handler) |
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364 | ; Если бы мы могли схлопотать исключение только из-за чтения байтов кода, |
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365 | ; мы бы его уже схлопотали и это было бы не #GP |
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366 | movzx esi, word [esp+v86_regs.cs] |
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367 | shl esi, 4 |
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368 | add esi, [esp+v86_regs.eip] |
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369 | lodsb |
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370 | cmp al, 0xCD ; int xx command = CD xx |
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371 | jz .handle_int |
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372 | cmp al, 0xCF |
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373 | jz .handle_iret |
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374 | cmp al, 0xF3 |
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375 | jz .handle_rep |
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376 | cmp al, 0xEC |
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377 | jz .handle_in |
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378 | cmp al, 0xED |
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379 | jz .handle_in_word |
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380 | cmp al, 0xEE |
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381 | jz .handle_out |
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382 | cmp al, 0xEF |
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383 | jz .handle_out_word |
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384 | cmp al, 0xE4 |
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385 | jz .handle_in_imm |
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386 | cmp al, 0xE6 |
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387 | jz .handle_out_imm |
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388 | cmp al, 0x9C |
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389 | jz .handle_pushf |
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390 | cmp al, 0x9D |
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391 | jz .handle_popf |
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392 | cmp al, 0xFA |
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393 | jz .handle_cli |
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394 | cmp al, 0xFB |
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395 | jz .handle_sti |
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396 | cmp al, 0x66 |
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397 | jz .handle_66 |
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398 | jmp .nogp |
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399 | .handle_int: |
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400 | cmp word [esp+v86_regs.eip], 0xFFFF |
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401 | jae .nogp |
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402 | xor eax, eax |
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403 | lodsb |
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404 | ; call sys_msg_board_byte |
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405 | ; simulate INT command |
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406 | ; N.B. It is possible that some checks need to be corrected, |
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407 | ; but at least in case of normal execution the code works. |
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408 | .simulate_int: |
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409 | cmp word [esp+v86_regs.esp], 6 |
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410 | jae @f |
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411 | mov bl, 12 ; #SS exception |
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412 | jmp .nogp |
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413 | @@: |
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414 | movzx edx, word [esp+v86_regs.ss] |
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415 | shl edx, 4 |
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416 | push eax |
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417 | movzx eax, word [esp+4+v86_regs.esp] |
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418 | sub eax, 6 |
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419 | add edx, eax |
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420 | mov eax, edx |
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421 | mov esi, [esp+4+sizeof.v86_regs+10h+4] |
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422 | call v86_get_lin_addr |
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423 | cmp eax, 0x1000 |
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424 | jae @f |
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425 | mov bl, 14 ; #PF exception |
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426 | jmp .nogp |
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427 | @@: |
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428 | lea eax, [edx+5] |
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429 | call v86_get_lin_addr |
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430 | cmp eax, 0x1000 |
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431 | jae @f |
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432 | mov bl, 14 ; #PF exception |
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433 | jmp .nogp |
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434 | @@: |
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435 | sub word [esp+4+v86_regs.esp], 6 |
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436 | mov eax, [esp+4+v86_regs.eip] |
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437 | cmp byte [esp+1], 0 |
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438 | jnz @f |
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439 | inc eax |
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440 | inc eax |
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441 | @@: |
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442 | mov word [edx], ax |
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443 | mov eax, [esp+4+v86_regs.cs] |
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444 | mov word [edx+2], ax |
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445 | mov eax, [esp+4+v86_regs.eflags] |
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446 | mov word [edx+4], ax |
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447 | pop eax |
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448 | mov ah, 0 |
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449 | mov cx, [eax*4] |
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450 | mov word [esp+v86_regs.eip], cx |
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451 | mov cx, [eax*4+2] |
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452 | mov word [esp+v86_regs.cs], cx |
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453 | ; note that interrupts will be disabled globally at IRET |
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454 | and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags |
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455 | ; continue V86 execution |
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456 | popad |
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457 | iretd |
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458 | .handle_iret: |
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459 | cmp word [esp+v86_regs.esp], 0x10000 - 6 |
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460 | jbe @f |
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461 | mov bl, 12 |
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462 | jmp .nogp |
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463 | @@: |
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464 | movzx edx, word [esp+v86_regs.ss] |
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465 | shl edx, 4 |
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466 | movzx eax, word [esp+v86_regs.esp] |
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467 | add edx, eax |
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468 | mov eax, edx |
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469 | mov esi, [esp+sizeof.v86_regs+10h+4] |
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470 | call v86_get_lin_addr |
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471 | cmp eax, 0x1000 |
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472 | jae @f |
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473 | mov bl, 14 |
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474 | jmp .nogp |
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475 | @@: |
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476 | lea eax, [edx+5] |
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477 | call v86_get_lin_addr |
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478 | cmp eax, 0x1000 |
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479 | jae @f |
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480 | mov bl, 14 |
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481 | jmp .nogp |
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482 | @@: |
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483 | mov ax, [edx] |
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484 | mov word [esp+v86_regs.eip], ax |
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485 | mov ax, [edx+2] |
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486 | mov word [esp+v86_regs.cs], ax |
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487 | mov ax, [edx+4] |
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488 | mov word [esp+v86_regs.eflags], ax |
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489 | add word [esp+v86_regs.esp], 6 |
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490 | popad |
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491 | iretd |
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492 | .handle_pushf: |
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493 | cmp word [esp+v86_regs.esp], 1 |
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494 | jnz @f |
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495 | mov bl, 12 |
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496 | jmp .nogp |
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497 | @@: |
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498 | movzx edx, word [esp+v86_regs.ss] |
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499 | shl edx, 4 |
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500 | mov eax, [esp+v86_regs.esp] |
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501 | sub eax, 2 |
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502 | movzx eax, ax |
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503 | add edx, eax |
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504 | mov eax, edx |
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505 | mov esi, [esp+sizeof.v86_regs+10h+4] |
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506 | call v86_get_lin_addr |
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507 | cmp eax, 0x1000 |
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508 | jae @f |
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509 | mov bl, 14 ; #PF exception |
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510 | jmp .nogp |
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511 | @@: |
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512 | lea eax, [edx+1] |
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513 | call v86_get_lin_addr |
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514 | cmp eax, 0x1000 |
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515 | jae @f |
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516 | mov bl, 14 |
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517 | jmp .nogp |
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518 | @@: |
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519 | sub word [esp+v86_regs.esp], 2 |
||
520 | mov eax, [esp+v86_regs.eflags] |
||
521 | mov [edx], ax |
||
522 | inc word [esp+v86_regs.eip] |
||
523 | popad |
||
524 | iretd |
||
525 | .handle_pushfd: |
||
526 | cmp word [esp+v86_regs.esp], 4 |
||
527 | jae @f |
||
528 | mov bl, 12 ; #SS exception |
||
529 | jmp .nogp |
||
530 | @@: |
||
531 | movzx edx, word [esp+v86_regs.ss] |
||
532 | shl edx, 4 |
||
533 | movzx eax, word [esp+v86_regs.esp] |
||
534 | sub eax, 4 |
||
535 | add edx, eax |
||
536 | mov eax, edx |
||
537 | mov esi, [esp+sizeof.v86_regs+10h+4] |
||
538 | call v86_get_lin_addr |
||
539 | cmp eax, 0x1000 |
||
540 | jae @f |
||
541 | mov bl, 14 ; #PF exception |
||
542 | jmp .nogp |
||
543 | @@: |
||
544 | lea eax, [edx+3] |
||
545 | call v86_get_lin_addr |
||
546 | cmp eax, 0x1000 |
||
547 | jae @f |
||
548 | mov bl, 14 ; #PF exception |
||
549 | jmp .nogp |
||
550 | @@: |
||
551 | sub word [esp+v86_regs.esp], 4 |
||
552 | movzx eax, word [esp+v86_regs.eflags] |
||
553 | mov [edx], eax |
||
554 | add word [esp+v86_regs.eip], 2 |
||
555 | popad |
||
556 | iretd |
||
557 | .handle_popf: |
||
558 | cmp word [esp+v86_regs.esp], 0xFFFF |
||
559 | jnz @f |
||
560 | mov bl, 12 |
||
561 | jmp .nogp |
||
562 | @@: |
||
563 | movzx edx, word [esp+v86_regs.ss] |
||
564 | shl edx, 4 |
||
565 | movzx eax, word [esp+v86_regs.esp] |
||
566 | add edx, eax |
||
567 | mov eax, edx |
||
568 | mov esi, [esp+sizeof.v86_regs+10h+4] |
||
569 | call v86_get_lin_addr |
||
570 | cmp eax, 0x1000 |
||
571 | jae @f |
||
572 | mov bl, 14 ; #PF exception |
||
573 | jmp .nogp |
||
574 | @@: |
||
575 | lea eax, [edx+1] |
||
576 | call v86_get_lin_addr |
||
577 | cmp eax, 0x1000 |
||
578 | jae @f |
||
579 | mov bl, 14 |
||
580 | jmp .nogp |
||
581 | @@: |
||
582 | mov ax, [edx] |
||
583 | mov word [esp+v86_regs.eflags], ax |
||
584 | add word [esp+v86_regs.esp], 2 |
||
585 | inc word [esp+v86_regs.eip] |
||
586 | popad |
||
587 | iretd |
||
588 | .handle_popfd: |
||
589 | cmp word [esp+v86_regs.esp], 0x10000 - 4 |
||
590 | jbe @f |
||
591 | mov bl, 12 |
||
592 | jmp .nogp |
||
593 | @@: |
||
594 | movzx edx, word [esp+v86_regs.ss] |
||
595 | shl edx, 4 |
||
596 | movzx eax, word [esp+v86_regs.esp] |
||
597 | add edx, eax |
||
598 | mov eax, edx |
||
599 | mov esi, [esp+sizeof.v86_regs+10h+4] |
||
600 | call v86_get_lin_addr |
||
601 | cmp eax, 0x1000 |
||
602 | jae @f |
||
603 | mov bl, 14 |
||
604 | jmp .nogp |
||
605 | @@: |
||
606 | lea eax, [edx+3] |
||
607 | call v86_get_lin_addr |
||
608 | cmp eax, 0x1000 |
||
609 | jae @f |
||
610 | mov bl, 14 |
||
611 | jmp .nogp |
||
612 | @@: |
||
613 | mov eax, [edx] |
||
614 | mov word [esp+v86_regs.eflags], ax |
||
615 | add word [esp+v86_regs.esp], 4 |
||
616 | add word [esp+v86_regs.eip], 2 |
||
617 | popad |
||
618 | iretd |
||
619 | .handle_cli: |
||
620 | and byte [esp+v86_regs.eflags+1], not 2 |
||
621 | inc word [esp+v86_regs.eip] |
||
622 | popad |
||
623 | iretd |
||
624 | .handle_sti: |
||
625 | or byte [esp+v86_regs.eflags+1], 2 |
||
626 | inc word [esp+v86_regs.eip] |
||
627 | popad |
||
628 | iretd |
||
629 | .handle_rep: |
||
630 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
631 | jae .nogp |
||
632 | lodsb |
||
633 | cmp al, 6Eh |
||
634 | jz .handle_rep_outsb |
||
635 | jmp .nogp |
||
636 | .handle_rep_outsb: |
||
637 | .handle_in: |
||
638 | .handle_out: |
||
639 | .invalid_io_byte: |
||
640 | movzx ebx, word [esp+v86_regs.edx] |
||
641 | mov ecx, 1 |
||
642 | jmp .invalid_io |
||
643 | .handle_in_imm: |
||
644 | .handle_out_imm: |
||
645 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
646 | jae .nogp |
||
647 | lodsb |
||
648 | movzx ebx, al |
||
649 | mov ecx, 1 |
||
650 | jmp .invalid_io |
||
651 | .handle_66: |
||
652 | cmp word [esp+v86_regs.eip], 0xFFFF |
||
653 | jae .nogp |
||
654 | lodsb |
||
655 | cmp al, 0x9C |
||
656 | jz .handle_pushfd |
||
657 | cmp al, 0x9D |
||
658 | jz .handle_popfd |
||
659 | cmp al, 0xEF |
||
660 | jz .handle_out_dword |
||
661 | cmp al, 0xED |
||
662 | jz .handle_in_dword |
||
663 | jmp .nogp |
||
664 | .handle_in_word: |
||
665 | .handle_out_word: |
||
666 | movzx ebx, word [esp+v86_regs.edx] |
||
667 | mov ecx, 2 |
||
668 | jmp .invalid_io |
||
669 | .handle_in_dword: |
||
670 | .handle_out_dword: |
||
671 | .invalid_io_dword: |
||
672 | movzx ebx, word [esp+v86_regs.edx] |
||
673 | mov ecx, 4 |
||
674 | .invalid_io: |
||
675 | mov esi, v86_io_str1 |
||
676 | call sys_msg_board_str |
||
677 | mov eax, ebx |
||
678 | call sys_msg_board_dword |
||
679 | mov esi, v86_io_byte |
||
680 | cmp ecx, 1 |
||
681 | jz @f |
||
682 | mov esi, v86_io_word |
||
683 | cmp ecx, 2 |
||
684 | jz @f |
||
685 | mov esi, v86_io_dword |
||
686 | @@: |
||
687 | call sys_msg_board_str |
||
688 | if DEBUG_SHOW_IO |
||
689 | mov edx, ebx |
||
690 | mov ebx, 200 |
||
691 | call delay_hs |
||
692 | mov esi, [esp+v86_regs.size+10h+4] |
||
693 | mov eax, [esi+V86_machine.iopm] |
||
694 | @@: |
||
695 | btr [eax], edx |
||
696 | inc edx |
||
697 | loop @b |
||
698 | popad |
||
699 | iretd |
||
700 | else |
||
701 | mov eax, 2 |
||
702 | jmp .exit |
||
703 | end if |
||
704 | .nogp: |
||
705 | |||
706 | mov esi, v86_exc_str1 |
||
707 | call sys_msg_board_str |
||
708 | mov al, bl |
||
709 | call sys_msg_board_byte |
||
710 | mov esi, v86_exc_str2 |
||
711 | call sys_msg_board_str |
||
712 | mov ax, [esp+32+4] |
||
713 | call sys_msg_board_word |
||
714 | mov esi, v86_exc_str3 |
||
715 | call sys_msg_board_str |
||
716 | mov ax, [esp+32] |
||
717 | call sys_msg_board_word |
||
718 | mov esi, v86_exc_str4 |
||
719 | call sys_msg_board_str |
||
720 | mov ecx, 8 |
||
721 | movzx edx, word [esp+32+4] |
||
722 | shl edx, 4 |
||
723 | add edx, [esp+32] |
||
724 | @@: |
||
725 | mov esi, [esp+sizeof.v86_regs+10h+4] |
||
726 | mov eax, edx |
||
727 | call v86_get_lin_addr |
||
728 | cmp eax, 0x1000 |
||
729 | jb .nopage |
||
730 | mov esi, v86_exc_str3-2 |
||
731 | call sys_msg_board_str |
||
732 | mov al, [edx] |
||
733 | call sys_msg_board_byte |
||
734 | inc edx |
||
735 | loop @b |
||
736 | jmp @f |
||
737 | .nopage: |
||
738 | mov esi, v86_exc_str5 |
||
739 | call sys_msg_board_str |
||
740 | @@: |
||
741 | mov esi, v86_newline |
||
742 | call sys_msg_board_str |
||
743 | mov eax, 1 |
||
744 | jmp .exit |
||
745 | |||
746 | .done: |
||
747 | xor eax, eax |
||
748 | |||
749 | .exit: |
||
750 | mov [esp+sizeof.v86_regs+10h+1Ch], eax |
||
751 | mov [esp+sizeof.v86_regs+10h+18h], ebx |
||
752 | |||
753 | mov edx, [esp+sizeof.v86_regs+10h+14h] |
||
754 | cmp edx, -1 |
||
755 | jz @f |
||
756 | dec [v86_irqhooks+edx*8+4] |
||
757 | jnz @f |
||
758 | and [v86_irqhooks+edx*8], 0 |
||
759 | @@: |
||
760 | |||
761 | mov esi, esp |
||
762 | mov edi, [esi+sizeof.v86_regs+10h+10h] |
||
763 | add edi, sizeof.v86_regs |
||
764 | mov ecx, sizeof.v86_regs/4 |
||
765 | rep movsd |
||
766 | mov esp, esi |
||
767 | |||
768 | cli |
||
5120 | serge | 769 | mov ecx, [current_slot] |
4429 | Serge | 770 | pop eax |
5120 | serge | 771 | |
772 | mov [ecx+APPDATA.saved_esp0], eax |
||
4429 | Serge | 773 | mov [tss._esp0], eax |
774 | pop eax |
||
5120 | serge | 775 | mov [ecx+APPDATA.process], eax |
4429 | Serge | 776 | pop ebx |
5120 | serge | 777 | mov dword [ecx+APPDATA.io_map+4], ebx |
4429 | Serge | 778 | mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx |
779 | pop ebx |
||
5120 | serge | 780 | mov dword [ecx+APPDATA.io_map], ebx |
4429 | Serge | 781 | mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx |
5120 | serge | 782 | mov [current_process], eax |
4993 | Serge | 783 | mov eax, [eax+PROC.pdt_0_phys] |
4429 | Serge | 784 | mov cr3, eax |
785 | sti |
||
786 | |||
787 | popad |
||
788 | ret |
||
789 | |||
790 | ;my05: |
||
791 | ; mov dx, 30C2h |
||
792 | ; mov cx, 4 |
||
793 | ;.0: |
||
794 | ; in al, dx |
||
795 | ; cmp al, 0FFh |
||
796 | ; jz @f |
||
797 | ; test al, 4 |
||
798 | ; jnz .1 |
||
799 | ;@@: |
||
800 | ; add dx, 8 |
||
801 | ; in al, dx |
||
802 | ; cmp al, 0FFh |
||
803 | ; jz @f |
||
804 | ; test al, 4 |
||
805 | ; jnz .1 |
||
806 | ;@@: |
||
807 | ; loop .0 |
||
808 | ; ret |
||
809 | ;.1: |
||
810 | ; or al, 84h |
||
811 | ; out dx, al |
||
812 | ;.2: |
||
813 | ; mov dx, 30F7h |
||
814 | ; in al, dx |
||
815 | ; mov byte [BOOT_VAR + 48Eh], 0FFh |
||
816 | ; ret |
||
817 | |||
818 | align 4 |
||
819 | v86_irq: |
||
820 | ; push irq/pushad/jmp v86_irq |
||
821 | ; ebp = irq |
||
822 | lea esi, [esp+1Ch] |
||
823 | lea edi, [esi+4] |
||
824 | mov ecx, 8 |
||
825 | std |
||
826 | rep movsd |
||
827 | cld |
||
828 | mov edi, ebp |
||
829 | pop eax |
||
830 | v86_irq2: |
||
831 | mov esi, [v86_irqhooks+edi*8] ; get VM handle |
||
4993 | Serge | 832 | mov eax, [esi+V86_machine.process] |
4429 | Serge | 833 | mov ecx, [CURRENT_TASK] |
834 | shl ecx, 8 |
||
835 | cmp [SLOT_BASE+ecx+APPDATA.process], eax |
||
836 | jnz .notcurrent |
||
837 | lea eax, [edi+8] |
||
838 | cmp al, 10h |
||
839 | mov ah, 1 |
||
840 | jb @f |
||
841 | add al, 60h |
||
842 | @@: |
||
843 | jmp v86_exc_c.simulate_int |
||
844 | .notcurrent: |
||
845 | mov ebx, SLOT_BASE + 0x100 |
||
846 | mov ecx, [TASK_COUNT] |
||
847 | .scan: |
||
848 | cmp [ebx+APPDATA.process], eax |
||
849 | jnz .cont |
||
850 | push ecx |
||
851 | mov ecx, [ebx+APPDATA.saved_esp0] |
||
852 | cmp word [ecx-sizeof.v86_regs+v86_regs.esp], 6 |
||
853 | jb .cont2 |
||
854 | movzx edx, word [ecx-sizeof.v86_regs+v86_regs.ss] |
||
855 | shl edx, 4 |
||
856 | push eax |
||
857 | movzx eax, word [ecx-sizeof.v86_regs+v86_regs.esp] |
||
858 | sub eax, 6 |
||
859 | add edx, eax |
||
860 | mov eax, edx |
||
861 | call v86_get_lin_addr |
||
862 | cmp eax, 0x1000 |
||
863 | jb .cont3 |
||
864 | lea eax, [edx+5] |
||
865 | call v86_get_lin_addr |
||
866 | cmp eax, 0x1000 |
||
867 | jb .cont3 |
||
868 | pop eax |
||
869 | pop ecx |
||
870 | jmp .found |
||
871 | .cont3: |
||
872 | pop eax |
||
873 | .cont2: |
||
874 | pop ecx |
||
875 | .cont: |
||
876 | add ebx, 0x100 |
||
877 | loop .scan |
||
878 | mov ecx, edi |
||
879 | call irq_eoi |
||
880 | popad |
||
881 | iretd |
||
882 | .found: |
||
4993 | Serge | 883 | mov eax, [eax+PROC.pdt_0_phys] |
4429 | Serge | 884 | mov cr3, eax |
885 | mov esi, [ebx+APPDATA.saved_esp0] |
||
886 | sub word [esi-sizeof.v86_regs+v86_regs.esp], 6 |
||
887 | mov ecx, [esi-sizeof.v86_regs+v86_regs.eip] |
||
888 | mov word [edx], cx |
||
889 | mov ecx, [esi-sizeof.v86_regs+v86_regs.cs] |
||
890 | mov word [edx+2], cx |
||
891 | mov ecx, [esi-sizeof.v86_regs+v86_regs.eflags] |
||
892 | mov word [edx+4], cx |
||
893 | lea eax, [edi+8] |
||
894 | cmp al, 10h |
||
895 | jb @f |
||
896 | add al, 60h |
||
897 | @@: |
||
898 | mov cx, [eax*4] |
||
899 | mov word [esi-sizeof.v86_regs+v86_regs.eip], cx |
||
900 | mov cx, [eax*4+2] |
||
901 | mov word [esi-sizeof.v86_regs+v86_regs.cs], cx |
||
902 | and byte [esi-sizeof.v86_regs+v86_regs.eflags+1], not 3 |
||
903 | call update_counters |
||
904 | lea edi, [ebx + 0x100000000 - SLOT_BASE] |
||
905 | shr edi, 3 |
||
906 | add edi, CURRENT_TASK |
||
907 | call find_next_task.found |
||
908 | call do_change_task |
||
909 | popad |
||
910 | iretd |