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1 | ;------------------------------------------------------------------------------\r |
| 2 | ;*\r |
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3 | ;* Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r |
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4 | ;* This program and the accompanying materials \r |
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5 | ;* are licensed and made available under the terms and conditions of the BSD License \r |
| 6 | ;* which accompanies this distribution. The full text of the license may be found at \r |
| 7 | ;* http://opensource.org/licenses/bsd-license.php \r |
| 8 | ;* \r |
| 9 | ;* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r |
| 10 | ;* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r |
| 11 | ;* \r |
| 12 | ;* start16.asm\r |
| 13 | ;* \r |
| 14 | ;* Abstract:\r |
| 15 | ;*\r |
| 16 | ;------------------------------------------------------------------------------\r |
| 17 | \r |
| 18 | .model small\r |
| 19 | .stack\r |
| 20 | .486p\r |
| 21 | .code\r |
| 22 | \r |
| 23 | FAT_DIRECTORY_ENTRY_SIZE EQU 020h\r |
| 24 | FAT_DIRECTORY_ENTRY_SHIFT EQU 5\r |
| 25 | BLOCK_SIZE EQU 0200h\r |
| 26 | BLOCK_MASK EQU 01ffh\r |
| 27 | BLOCK_SHIFT EQU 9\r |
| 28 | \r |
| 29 | org 0h\r |
| 30 | Ia32Jump:\r |
| 31 | jmp BootSectorEntryPoint ; JMP inst - 3 bytes\r |
| 32 | nop\r |
| 33 | \r |
| 34 | OemId db "INTEL " ; OemId - 8 bytes\r |
| 35 | \r |
| 36 | SectorSize dw 0 ; Sector Size - 16 bits\r |
| 37 | SectorsPerCluster db 0 ; Sector Per Cluster - 8 bits\r |
| 38 | ReservedSectors dw 0 ; Reserved Sectors - 16 bits\r |
| 39 | NoFats db 0 ; Number of FATs - 8 bits\r |
| 40 | RootEntries dw 0 ; Root Entries - 16 bits\r |
| 41 | Sectors dw 0 ; Number of Sectors - 16 bits\r |
| 42 | Media db 0 ; Media - 8 bits - ignored\r |
| 43 | SectorsPerFat dw 0 ; Sectors Per FAT - 16 bits\r |
| 44 | SectorsPerTrack dw 0 ; Sectors Per Track - 16 bits - ignored\r |
| 45 | Heads dw 0 ; Heads - 16 bits - ignored\r |
| 46 | HiddenSectors dd 0 ; Hidden Sectors - 32 bits - ignored\r |
| 47 | LargeSectors dd 0 ; Large Sectors - 32 bits \r |
| 48 | PhysicalDrive db 0 ; PhysicalDriveNumber - 8 bits - ignored\r |
| 49 | CurrentHead db 0 ; Current Head - 8 bits\r |
| 50 | Signature db 0 ; Signature - 8 bits - ignored\r |
| 51 | VolId db " " ; Volume Serial Number- 4 bytes\r |
| 52 | FatLabel db " " ; Label - 11 bytes\r |
| 53 | SystemId db "FAT16 " ; SystemId - 8 bytes\r |
| 54 | \r |
| 55 | BootSectorEntryPoint:\r |
| 56 | ASSUME ds:@code\r |
| 57 | ASSUME ss:@code\r |
| 58 | ; ds = 1000, es = 2000 + x (size of first cluster >> 4)\r |
| 59 | ; cx = Start Cluster of EfiLdr\r |
| 60 | ; dx = Start Cluster of Efivar.bin\r |
| 61 | \r |
| 62 | ; Re use the BPB data stored in Boot Sector\r |
| 63 | mov bp,07c00h\r |
| 64 | \r |
| 65 | push cx\r |
| 66 | ; Read Efivar.bin\r |
| 67 | ; 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r |
| 68 | mov ax,01900h\r |
| 69 | mov es,ax\r |
| 70 | test dx,dx\r |
| 71 | jnz CheckVarStoreSize\r |
| 72 | \r |
| 73 | mov al,1\r |
| 74 | NoVarStore:\r |
| 75 | push es\r |
| 76 | ; Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r |
| 77 | mov byte ptr es:[4],al\r |
| 78 | jmp SaveVolumeId\r |
| 79 | \r |
| 80 | CheckVarStoreSize:\r |
| 81 | mov di,dx\r |
| 82 | cmp dword ptr ds:[di+2], 04000h\r |
| 83 | mov al,2\r |
| 84 | jne NoVarStore\r |
| 85 | \r |
| 86 | LoadVarStore:\r |
| 87 | mov al,0\r |
| 88 | mov byte ptr es:[4],al\r |
| 89 | mov cx,word ptr[di]\r |
| 90 | ; ES:DI = 1500:0\r |
| 91 | xor di,di\r |
| 92 | push es\r |
| 93 | mov ax,01500h\r |
| 94 | mov es,ax\r |
| 95 | call ReadFile\r |
| 96 | SaveVolumeId:\r |
| 97 | pop es\r |
| 98 | mov ax,word ptr [bp+VolId]\r |
| 99 | mov word ptr es:[0],ax ; Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r |
| 100 | mov ax,word ptr [bp+VolId+2]\r |
| 101 | mov word ptr es:[2],ax\r |
| 102 | \r |
| 103 | ; Read Efildr\r |
| 104 | pop cx\r |
| 105 | ; cx = Start Cluster of Efildr -> BS.com has filled already\r |
| 106 | ; ES:DI = 2000:0, first cluster will be read again\r |
| 107 | xor di,di ; di = 0\r |
| 108 | mov ax,02000h\r |
| 109 | mov es,ax\r |
| 110 | call ReadFile\r |
| 111 | mov ax,cs\r |
| 112 | mov word ptr cs:[JumpSegment],ax\r |
| 113 | \r |
| 114 | JumpFarInstruction:\r |
| 115 | db 0eah\r |
| 116 | JumpOffset:\r |
| 117 | dw 0200h\r |
| 118 | JumpSegment:\r |
| 119 | dw 2000h\r |
| 120 | \r |
| 121 | \r |
| 122 | \r |
| 123 | ; ****************************************************************************\r |
| 124 | ; ReadFile\r |
| 125 | ;\r |
| 126 | ; Arguments:\r |
| 127 | ; CX = Start Cluster of File\r |
| 128 | ; ES:DI = Buffer to store file content read from disk\r |
| 129 | ;\r |
| 130 | ; Return:\r |
| 131 | ; (ES << 4 + DI) = end of file content Buffer\r |
| 132 | ;\r |
| 133 | ; ****************************************************************************\r |
| 134 | ReadFile:\r |
| 135 | ; si = NumberOfClusters\r |
| 136 | ; cx = ClusterNumber\r |
| 137 | ; dx = CachedFatSectorNumber\r |
| 138 | ; ds:0000 = CacheFatSectorBuffer\r |
| 139 | ; es:di = Buffer to load file\r |
| 140 | ; bx = NextClusterNumber\r |
| 141 | pusha\r |
| 142 | mov si,1 ; NumberOfClusters = 1\r |
| 143 | push cx ; Push Start Cluster onto stack\r |
| 144 | mov dx,0fffh ; CachedFatSectorNumber = 0xfff\r |
| 145 | FatChainLoop:\r |
| 146 | mov ax,cx ; ax = ClusterNumber \r |
| 147 | and ax,0fff8h ; ax = ax & 0xfff8\r |
| 148 | cmp ax,0fff8h ; See if this is the last cluster\r |
| 149 | je FoundLastCluster ; Jump if last cluster found\r |
| 150 | mov ax,cx ; ax = ClusterNumber\r |
| 151 | shl ax,1 ; FatOffset = ClusterNumber * 2\r |
| 152 | push si ; Save si\r |
| 153 | mov si,ax ; si = FatOffset\r |
| 154 | shr ax,BLOCK_SHIFT ; ax = FatOffset >> BLOCK_SHIFT\r |
| 155 | add ax,word ptr [bp+ReservedSectors] ; ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r |
| 156 | and si,BLOCK_MASK ; si = FatOffset & BLOCK_MASK\r |
| 157 | cmp ax,dx ; Compare FatSectorNumber to CachedFatSectorNumber\r |
| 158 | je SkipFatRead\r |
| 159 | mov bx,2 \r |
| 160 | push es\r |
| 161 | push ds\r |
| 162 | pop es\r |
| 163 | call ReadBlocks ; Read 2 blocks starting at AX storing at ES:DI\r |
| 164 | pop es\r |
| 165 | mov dx,ax ; CachedFatSectorNumber = FatSectorNumber\r |
| 166 | SkipFatRead:\r |
| 167 | mov bx,word ptr [si] ; bx = NextClusterNumber\r |
| 168 | mov ax,cx ; ax = ClusterNumber\r |
| 169 | pop si ; Restore si\r |
| 170 | dec bx ; bx = NextClusterNumber - 1\r |
| 171 | cmp bx,cx ; See if (NextClusterNumber-1)==ClusterNumber\r |
| 172 | jne ReadClusters\r |
| 173 | inc bx ; bx = NextClusterNumber\r |
| 174 | inc si ; NumberOfClusters++\r |
| 175 | mov cx,bx ; ClusterNumber = NextClusterNumber\r |
| 176 | jmp FatChainLoop\r |
| 177 | ReadClusters:\r |
| 178 | inc bx\r |
| 179 | pop ax ; ax = StartCluster\r |
| 180 | push bx ; StartCluster = NextClusterNumber\r |
| 181 | mov cx,bx ; ClusterNumber = NextClusterNumber\r |
| 182 | sub ax,2 ; ax = StartCluster - 2\r |
| 183 | xor bh,bh \r |
| 184 | mov bl,byte ptr [bp+SectorsPerCluster] ; bx = SectorsPerCluster\r |
| 185 | mul bx ; ax = (StartCluster - 2) * SectorsPerCluster\r |
| 186 | add ax, word ptr [bp] ; ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r |
| 187 | push ax ; save start sector\r |
| 188 | mov ax,si ; ax = NumberOfClusters\r |
| 189 | mul bx ; ax = NumberOfClusters * SectorsPerCluster\r |
| 190 | mov bx,ax ; bx = Number of Sectors\r |
| 191 | pop ax ; ax = Start Sector\r |
| 192 | call ReadBlocks\r |
| 193 | mov si,1 ; NumberOfClusters = 1\r |
| 194 | jmp FatChainLoop\r |
| 195 | FoundLastCluster:\r |
| 196 | pop cx\r |
| 197 | popa\r |
| 198 | ret\r |
| 199 | \r |
| 200 | \r |
| 201 | ; ****************************************************************************\r |
| 202 | ; ReadBlocks - Reads a set of blocks from a block device\r |
| 203 | ;\r |
| 204 | ; AX = Start LBA\r |
| 205 | ; BX = Number of Blocks to Read\r |
| 206 | ; ES:DI = Buffer to store sectors read from disk\r |
| 207 | ; ****************************************************************************\r |
| 208 | \r |
| 209 | ; cx = Blocks\r |
| 210 | ; bx = NumberOfBlocks\r |
| 211 | ; si = StartLBA\r |
| 212 | \r |
| 213 | ReadBlocks:\r |
| 214 | pusha\r |
| 215 | add eax,dword ptr [bp+LBAOffsetForBootSector] ; Add LBAOffsetForBootSector to Start LBA\r |
| 216 | add eax,dword ptr [bp+HiddenSectors] ; Add HiddenSectors to Start LBA\r |
| 217 | mov esi,eax ; esi = Start LBA\r |
| 218 | mov cx,bx ; cx = Number of blocks to read\r |
| 219 | ReadCylinderLoop:\r |
| 220 | mov bp,07bfch ; bp = 0x7bfc\r |
| 221 | mov eax,esi ; eax = Start LBA\r |
| 222 | xor edx,edx ; edx = 0\r |
| 223 | movzx ebx,word ptr [bp] ; bx = MaxSector\r |
| 224 | div ebx ; ax = StartLBA / MaxSector\r |
| 225 | inc dx ; dx = (StartLBA % MaxSector) + 1\r |
| 226 | \r |
| 227 | mov bx,word ptr [bp] ; bx = MaxSector\r |
| 228 | sub bx,dx ; bx = MaxSector - Sector\r |
| 229 | inc bx ; bx = MaxSector - Sector + 1\r |
| 230 | cmp cx,bx ; Compare (Blocks) to (MaxSector - Sector + 1)\r |
| 231 | jg LimitTransfer\r |
| 232 | mov bx,cx ; bx = Blocks\r |
| 233 | LimitTransfer:\r |
| 234 | push ax ; save ax\r |
| 235 | mov ax,es ; ax = es\r |
| 236 | shr ax,(BLOCK_SHIFT-4) ; ax = Number of blocks into mem system\r |
| 237 | and ax,07fh ; ax = Number of blocks into current seg\r |
| 238 | add ax,bx ; ax = End Block number of transfer\r |
| 239 | cmp ax,080h ; See if it crosses a 64K boundry\r |
| 240 | jle NotCrossing64KBoundry ; Branch if not crossing 64K boundry\r |
| 241 | sub ax,080h ; ax = Number of blocks past 64K boundry\r |
| 242 | sub bx,ax ; Decrease transfer size by block overage\r |
| 243 | NotCrossing64KBoundry:\r |
| 244 | pop ax ; restore ax\r |
| 245 | \r |
| 246 | push cx\r |
| 247 | mov cl,dl ; cl = (StartLBA % MaxSector) + 1 = Sector\r |
| 248 | xor dx,dx ; dx = 0\r |
| 249 | div word ptr [bp+2] ; ax = ax / (MaxHead + 1) = Cylinder \r |
| 250 | ; dx = ax % (MaxHead + 1) = Head\r |
| 251 | \r |
| 252 | push bx ; Save number of blocks to transfer\r |
| 253 | mov dh,dl ; dh = Head\r |
| 254 | mov bp,07c00h ; bp = 0x7c00\r |
| 255 | mov dl,byte ptr [bp+PhysicalDrive] ; dl = Drive Number\r |
| 256 | mov ch,al ; ch = Cylinder\r |
| 257 | mov al,bl ; al = Blocks\r |
| 258 | mov ah,2 ; ah = Function 2\r |
| 259 | mov bx,di ; es:bx = Buffer address\r |
| 260 | int 013h\r |
| 261 | jc DiskError\r |
| 262 | pop bx\r |
| 263 | pop cx\r |
| 264 | movzx ebx,bx\r |
| 265 | add esi,ebx ; StartLBA = StartLBA + NumberOfBlocks\r |
| 266 | sub cx,bx ; Blocks = Blocks - NumberOfBlocks\r |
| 267 | mov ax,es\r |
| 268 | shl bx,(BLOCK_SHIFT-4)\r |
| 269 | add ax,bx\r |
| 270 | mov es,ax ; es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r |
| 271 | cmp cx,0\r |
| 272 | jne ReadCylinderLoop\r |
| 273 | popa\r |
| 274 | ret\r |
| 275 | \r |
| 276 | DiskError:\r |
| 277 | push cs\r |
| 278 | pop ds\r |
| 279 | lea si, [ErrorString]\r |
| 280 | mov cx, 7\r |
| 281 | jmp PrintStringAndHalt\r |
| 282 | \r |
| 283 | PrintStringAndHalt:\r |
| 284 | mov ax,0b800h\r |
| 285 | mov es,ax\r |
| 286 | mov di,160\r |
| 287 | rep movsw\r |
| 288 | Halt:\r |
| 289 | jmp Halt\r |
| 290 | \r |
| 291 | ErrorString:\r |
| 292 | db 'S', 0ch, 'E', 0ch, 'r', 0ch, 'r', 0ch, 'o', 0ch, 'r', 0ch, '!', 0ch\r |
| 293 | \r |
| 294 | org 01fah\r |
| 295 | LBAOffsetForBootSector:\r |
| 296 | dd 0h\r |
| 297 | \r |
| 298 | org 01feh\r |
| 299 | dw 0aa55h\r |
| 300 | \r |
| 301 | ;******************************************************************************\r |
| 302 | ;******************************************************************************\r |
| 303 | ;******************************************************************************\r |
| 304 | \r |
| 305 | DELAY_PORT equ 0edh ; Port to use for 1uS delay\r |
| 306 | KBD_CONTROL_PORT equ 060h ; 8042 control port \r |
| 307 | KBD_STATUS_PORT equ 064h ; 8042 status port \r |
| 308 | WRITE_DATA_PORT_CMD equ 0d1h ; 8042 command to write the data port\r |
| 309 | ENABLE_A20_CMD equ 0dfh ; 8042 command to enable A20\r |
| 310 | \r |
| 311 | org 200h\r |
| 312 | jmp start\r |
| 313 | Em64String:\r |
| 314 | db 'E', 0ch, 'm', 0ch, '6', 0ch, '4', 0ch, 'T', 0ch, ' ', 0ch, 'U', 0ch, 'n', 0ch, 's', 0ch, 'u', 0ch, 'p', 0ch, 'p', 0ch, 'o', 0ch, 'r', 0ch, 't', 0ch, 'e', 0ch, 'd', 0ch, '!', 0ch\r |
| 315 | \r |
| 316 | start: \r |
| 317 | mov ax,cs\r |
| 318 | mov ds,ax\r |
| 319 | mov es,ax\r |
| 320 | mov ss,ax\r |
| 321 | mov sp,MyStack\r |
| 322 | \r |
| 323 | ; mov ax,0b800h\r |
| 324 | ; mov es,ax\r |
| 325 | ; mov byte ptr es:[160],'a'\r |
| 326 | ; mov ax,cs\r |
| 327 | ; mov es,ax\r |
| 328 | \r |
| 329 | mov ebx,0\r |
| 330 | lea edi,MemoryMap\r |
| 331 | MemMapLoop:\r |
| 332 | mov eax,0e820h\r |
| 333 | mov ecx,20\r |
| 334 | mov edx,'SMAP'\r |
| 335 | int 15h\r |
| 336 | jc MemMapDone\r |
| 337 | add edi,20\r |
| 338 | cmp ebx,0\r |
| 339 | je MemMapDone\r |
| 340 | jmp MemMapLoop\r |
| 341 | MemMapDone:\r |
| 342 | lea eax,MemoryMap\r |
| 343 | sub edi,eax ; Get the address of the memory map\r |
| 344 | mov dword ptr [MemoryMapSize],edi ; Save the size of the memory map\r |
| 345 | \r |
| 346 | xor ebx,ebx\r |
| 347 | mov bx,cs ; BX=segment\r |
| 348 | shl ebx,4 ; BX="linear" address of segment base\r |
| 349 | lea eax,[GDT_BASE + ebx] ; EAX=PHYSICAL address of gdt\r |
| 350 | mov dword ptr [gdtr + 2],eax ; Put address of gdt into the gdtr\r |
| 351 | lea eax,[IDT_BASE + ebx] ; EAX=PHYSICAL address of idt\r |
| 352 | mov dword ptr [idtr + 2],eax ; Put address of idt into the idtr\r |
| 353 | lea edx,[MemoryMapSize + ebx] ; Physical base address of the memory map\r |
| 354 | \r |
| 355 | add ebx,01000h ; Source of EFI32\r |
| 356 | mov dword ptr [JUMP+2],ebx\r |
| 357 | add ebx,01000h\r |
| 358 | mov esi,ebx ; Source of EFILDR32\r |
| 359 | \r |
| 360 | ; mov ax,0b800h\r |
| 361 | ; mov es,ax\r |
| 362 | ; mov byte ptr es:[162],'b'\r |
| 363 | ; mov ax,cs\r |
| 364 | ; mov es,ax\r |
| 365 | \r |
| 366 | ;\r |
| 367 | ; Enable A20 Gate \r |
| 368 | ;\r |
| 369 | \r |
| 370 | mov ax,2401h ; Enable A20 Gate\r |
| 371 | int 15h\r |
| 372 | jnc A20GateEnabled ; Jump if it suceeded\r |
| 373 | \r |
| 374 | ;\r |
| 375 | ; If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r |
| 376 | ;\r |
| 377 | \r |
| 378 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r |
| 379 | jnz Timeout8042 ; Jump if the 8042 timed out\r |
| 380 | out DELAY_PORT,ax ; Delay 1 uS\r |
| 381 | mov al,WRITE_DATA_PORT_CMD ; 8042 cmd to write output port\r |
| 382 | out KBD_STATUS_PORT,al ; Send command to the 8042\r |
| 383 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r |
| 384 | jnz Timeout8042 ; Jump if the 8042 timed out\r |
| 385 | mov al,ENABLE_A20_CMD ; gate address bit 20 on\r |
| 386 | out KBD_CONTROL_PORT,al ; Send command to thre 8042\r |
| 387 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r |
| 388 | mov cx,25 ; Delay 25 uS for the command to complete on the 8042\r |
| 389 | Delay25uS:\r |
| 390 | out DELAY_PORT,ax ; Delay 1 uS\r |
| 391 | loop Delay25uS \r |
| 392 | Timeout8042:\r |
| 393 | \r |
| 394 | \r |
| 395 | A20GateEnabled:\r |
| 3a4b9eba |
396 | mov bx,0008h ; Flat data descriptor\r |
| c69dd9df |
397 | ;\r |
| 398 | ; DISABLE INTERRUPTS - Entering Protected Mode\r |
| 399 | ;\r |
| 400 | \r |
| 401 | cli \r |
| 402 | \r |
| 403 | ; mov ax,0b800h\r |
| 404 | ; mov es,ax\r |
| 405 | ; mov byte ptr es:[164],'c'\r |
| 406 | ; mov ax,cs\r |
| 407 | ; mov es,ax\r |
| 408 | \r |
| 409 | db 66h \r |
| 410 | lgdt fword ptr [gdtr]\r |
| 411 | db 66h \r |
| 412 | lidt fword ptr [idtr]\r |
| 413 | \r |
| 414 | mov eax,cr0\r |
| 415 | or al,1\r |
| 416 | mov cr0,eax\r |
| c69dd9df |
417 | JUMP:\r |
| 418 | ; jmp far 0010:00020000\r |
| 419 | db 066h\r |
| 420 | db 0eah\r |
| 421 | dd 000020000h\r |
| 422 | dw 00010h\r |
| 423 | \r |
| 424 | Empty8042InputBuffer:\r |
| 425 | mov cx,0\r |
| 426 | Empty8042Loop:\r |
| 427 | out DELAY_PORT,ax ; Delay 1us\r |
| 428 | in al,KBD_STATUS_PORT ; Read the 8042 Status Port\r |
| 429 | and al,02h ; Check the Input Buffer Full Flag\r |
| 430 | loopnz Empty8042Loop ; Loop until the input buffer is empty or a timout of 65536 uS\r |
| 431 | ret\r |
| 432 | \r |
| 433 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| 434 | ; data\r |
| 435 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| 436 | \r |
| 437 | align 02h\r |
| 438 | \r |
| 439 | gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit\r |
| 440 | dd 0 ; (GDT base gets set above)\r |
| 441 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| 442 | ; global descriptor table (GDT)\r |
| 443 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| 444 | \r |
| 445 | align 02h\r |
| 446 | \r |
| 447 | public GDT_BASE\r |
| 448 | GDT_BASE:\r |
| 449 | ; null descriptor\r |
| 450 | NULL_SEL equ $-GDT_BASE\r |
| 451 | dw 0 ; limit 15:0\r |
| 452 | dw 0 ; base 15:0\r |
| 453 | db 0 ; base 23:16\r |
| 454 | db 0 ; type\r |
| 455 | db 0 ; limit 19:16, flags\r |
| 456 | db 0 ; base 31:24\r |
| 457 | \r |
| 458 | ; linear data segment descriptor\r |
| 459 | LINEAR_SEL equ $-GDT_BASE\r |
| 460 | dw 0FFFFh ; limit 0xFFFFF\r |
| 461 | dw 0 ; base 0\r |
| 462 | db 0\r |
| 463 | db 092h ; present, ring 0, data, expand-up, writable\r |
| 464 | db 0CFh ; page-granular, 32-bit\r |
| 465 | db 0\r |
| 466 | \r |
| 467 | ; linear code segment descriptor\r |
| 468 | LINEAR_CODE_SEL equ $-GDT_BASE\r |
| 469 | dw 0FFFFh ; limit 0xFFFFF\r |
| 470 | dw 0 ; base 0\r |
| 471 | db 0\r |
| 472 | db 09Ah ; present, ring 0, data, expand-up, writable\r |
| 473 | db 0CFh ; page-granular, 32-bit\r |
| 474 | db 0\r |
| 475 | \r |
| 476 | ; system data segment descriptor\r |
| 477 | SYS_DATA_SEL equ $-GDT_BASE\r |
| 478 | dw 0FFFFh ; limit 0xFFFFF\r |
| 479 | dw 0 ; base 0\r |
| 480 | db 0\r |
| 481 | db 092h ; present, ring 0, data, expand-up, writable\r |
| 482 | db 0CFh ; page-granular, 32-bit\r |
| 483 | db 0\r |
| 484 | \r |
| 485 | ; system code segment descriptor\r |
| 486 | SYS_CODE_SEL equ $-GDT_BASE\r |
| 487 | dw 0FFFFh ; limit 0xFFFFF\r |
| 488 | dw 0 ; base 0\r |
| 489 | db 0\r |
| 490 | db 09Ah ; present, ring 0, data, expand-up, writable\r |
| 491 | db 0CFh ; page-granular, 32-bit\r |
| 492 | db 0\r |
| 493 | \r |
| 494 | ; spare segment descriptor\r |
| 495 | SPARE3_SEL equ $-GDT_BASE\r |
| 496 | dw 0 ; limit 0xFFFFF\r |
| 497 | dw 0 ; base 0\r |
| 498 | db 0\r |
| 499 | db 0 ; present, ring 0, data, expand-up, writable\r |
| 500 | db 0 ; page-granular, 32-bit\r |
| 501 | db 0\r |
| 502 | \r |
| 503 | ; spare segment descriptor\r |
| 504 | SPARE4_SEL equ $-GDT_BASE\r |
| 505 | dw 0 ; limit 0xFFFFF\r |
| 506 | dw 0 ; base 0\r |
| 507 | db 0\r |
| 508 | db 0 ; present, ring 0, data, expand-up, writable\r |
| 509 | db 0 ; page-granular, 32-bit\r |
| 510 | db 0\r |
| 511 | \r |
| 512 | ; spare segment descriptor\r |
| 513 | SPARE5_SEL equ $-GDT_BASE\r |
| 514 | dw 0 ; limit 0xFFFFF\r |
| 515 | dw 0 ; base 0\r |
| 516 | db 0\r |
| 517 | db 0 ; present, ring 0, data, expand-up, writable\r |
| 518 | db 0 ; page-granular, 32-bit\r |
| 519 | db 0\r |
| 520 | \r |
| 521 | GDT_END:\r |
| 522 | \r |
| 523 | align 02h\r |
| 524 | \r |
| 525 | \r |
| 526 | \r |
| 527 | idtr dw IDT_END - IDT_BASE - 1 ; IDT limit\r |
| 528 | dd 0 ; (IDT base gets set above)\r |
| 529 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| 530 | ; interrupt descriptor table (IDT)\r |
| 531 | ;\r |
| 532 | ; Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r |
| 533 | ; mappings. This implementation only uses the system timer and all other\r |
| 534 | ; IRQs will remain masked. The descriptors for vectors 33+ are provided\r |
| 535 | ; for convenience.\r |
| 536 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| 537 | \r |
| 538 | ;idt_tag db "IDT",0 \r |
| 539 | align 02h\r |
| 540 | \r |
| 541 | public IDT_BASE\r |
| 542 | IDT_BASE:\r |
| 543 | ; divide by zero (INT 0)\r |
| 544 | DIV_ZERO_SEL equ $-IDT_BASE\r |
| 545 | dw 0 ; offset 15:0\r |
| 546 | dw SYS_CODE_SEL ; selector 15:0\r |
| 547 | db 0 ; 0 for interrupt gate\r |
| 548 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 549 | dw 0 ; offset 31:16\r |
| 550 | \r |
| 551 | ; debug exception (INT 1)\r |
| 552 | DEBUG_EXCEPT_SEL equ $-IDT_BASE\r |
| 553 | dw 0 ; offset 15:0\r |
| 554 | dw SYS_CODE_SEL ; selector 15:0\r |
| 555 | db 0 ; 0 for interrupt gate\r |
| 556 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 557 | dw 0 ; offset 31:16\r |
| 558 | \r |
| 559 | ; NMI (INT 2)\r |
| 560 | NMI_SEL equ $-IDT_BASE\r |
| 561 | dw 0 ; offset 15:0\r |
| 562 | dw SYS_CODE_SEL ; selector 15:0\r |
| 563 | db 0 ; 0 for interrupt gate\r |
| 564 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 565 | dw 0 ; offset 31:16\r |
| 566 | \r |
| 567 | ; soft breakpoint (INT 3)\r |
| 568 | BREAKPOINT_SEL equ $-IDT_BASE\r |
| 569 | dw 0 ; offset 15:0\r |
| 570 | dw SYS_CODE_SEL ; selector 15:0\r |
| 571 | db 0 ; 0 for interrupt gate\r |
| 572 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 573 | dw 0 ; offset 31:16\r |
| 574 | \r |
| 575 | ; overflow (INT 4)\r |
| 576 | OVERFLOW_SEL equ $-IDT_BASE\r |
| 577 | dw 0 ; offset 15:0\r |
| 578 | dw SYS_CODE_SEL ; selector 15:0\r |
| 579 | db 0 ; 0 for interrupt gate\r |
| 580 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 581 | dw 0 ; offset 31:16\r |
| 582 | \r |
| 583 | ; bounds check (INT 5)\r |
| 584 | BOUNDS_CHECK_SEL equ $-IDT_BASE\r |
| 585 | dw 0 ; offset 15:0\r |
| 586 | dw SYS_CODE_SEL ; selector 15:0\r |
| 587 | db 0 ; 0 for interrupt gate\r |
| 588 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 589 | dw 0 ; offset 31:16\r |
| 590 | \r |
| 591 | ; invalid opcode (INT 6)\r |
| 592 | INVALID_OPCODE_SEL equ $-IDT_BASE\r |
| 593 | dw 0 ; offset 15:0\r |
| 594 | dw SYS_CODE_SEL ; selector 15:0\r |
| 595 | db 0 ; 0 for interrupt gate\r |
| 596 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 597 | dw 0 ; offset 31:16\r |
| 598 | \r |
| 599 | ; device not available (INT 7)\r |
| 600 | DEV_NOT_AVAIL_SEL equ $-IDT_BASE\r |
| 601 | dw 0 ; offset 15:0\r |
| 602 | dw SYS_CODE_SEL ; selector 15:0\r |
| 603 | db 0 ; 0 for interrupt gate\r |
| 604 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 605 | dw 0 ; offset 31:16\r |
| 606 | \r |
| 607 | ; double fault (INT 8)\r |
| 608 | DOUBLE_FAULT_SEL equ $-IDT_BASE\r |
| 609 | dw 0 ; offset 15:0\r |
| 610 | dw SYS_CODE_SEL ; selector 15:0\r |
| 611 | db 0 ; 0 for interrupt gate\r |
| 612 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 613 | dw 0 ; offset 31:16\r |
| 614 | \r |
| 615 | ; Coprocessor segment overrun - reserved (INT 9)\r |
| 616 | RSVD_INTR_SEL1 equ $-IDT_BASE\r |
| 617 | dw 0 ; offset 15:0\r |
| 618 | dw SYS_CODE_SEL ; selector 15:0\r |
| 619 | db 0 ; 0 for interrupt gate\r |
| 620 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 621 | dw 0 ; offset 31:16\r |
| 622 | \r |
| 623 | ; invalid TSS (INT 0ah)\r |
| 624 | INVALID_TSS_SEL equ $-IDT_BASE\r |
| 625 | dw 0 ; offset 15:0\r |
| 626 | dw SYS_CODE_SEL ; selector 15:0\r |
| 627 | db 0 ; 0 for interrupt gate\r |
| 628 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 629 | dw 0 ; offset 31:16\r |
| 630 | \r |
| 631 | ; segment not present (INT 0bh)\r |
| 632 | SEG_NOT_PRESENT_SEL equ $-IDT_BASE\r |
| 633 | dw 0 ; offset 15:0\r |
| 634 | dw SYS_CODE_SEL ; selector 15:0\r |
| 635 | db 0 ; 0 for interrupt gate\r |
| 636 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 637 | dw 0 ; offset 31:16\r |
| 638 | \r |
| 639 | ; stack fault (INT 0ch)\r |
| 640 | STACK_FAULT_SEL equ $-IDT_BASE\r |
| 641 | dw 0 ; offset 15:0\r |
| 642 | dw SYS_CODE_SEL ; selector 15:0\r |
| 643 | db 0 ; 0 for interrupt gate\r |
| 644 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 645 | dw 0 ; offset 31:16\r |
| 646 | \r |
| 647 | ; general protection (INT 0dh)\r |
| 648 | GP_FAULT_SEL equ $-IDT_BASE\r |
| 649 | dw 0 ; offset 15:0\r |
| 650 | dw SYS_CODE_SEL ; selector 15:0\r |
| 651 | db 0 ; 0 for interrupt gate\r |
| 652 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 653 | dw 0 ; offset 31:16\r |
| 654 | \r |
| 655 | ; page fault (INT 0eh)\r |
| 656 | PAGE_FAULT_SEL equ $-IDT_BASE\r |
| 657 | dw 0 ; offset 15:0\r |
| 658 | dw SYS_CODE_SEL ; selector 15:0\r |
| 659 | db 0 ; 0 for interrupt gate\r |
| 660 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 661 | dw 0 ; offset 31:16\r |
| 662 | \r |
| 663 | ; Intel reserved - do not use (INT 0fh)\r |
| 664 | RSVD_INTR_SEL2 equ $-IDT_BASE\r |
| 665 | dw 0 ; offset 15:0\r |
| 666 | dw SYS_CODE_SEL ; selector 15:0\r |
| 667 | db 0 ; 0 for interrupt gate\r |
| 668 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 669 | dw 0 ; offset 31:16\r |
| 670 | \r |
| 671 | ; floating point error (INT 10h)\r |
| 672 | FLT_POINT_ERR_SEL equ $-IDT_BASE\r |
| 673 | dw 0 ; offset 15:0\r |
| 674 | dw SYS_CODE_SEL ; selector 15:0\r |
| 675 | db 0 ; 0 for interrupt gate\r |
| 676 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| 677 | dw 0 ; offset 31:16\r |
| 678 | \r |
| 679 | ; alignment check (INT 11h)\r |
| 680 | ALIGNMENT_CHECK_SEL equ $-IDT_BASE\r |
| 681 | dw 0 ; offset 15:0\r |
| 682 | dw SYS_CODE_SEL ; selector 15:0\r |
| 683 | db 0 ; 0 for interrupt gate\r |
| 684 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 685 | dw 0 ; offset 31:16\r |
| 686 | \r |
| 687 | ; machine check (INT 12h)\r |
| 688 | MACHINE_CHECK_SEL equ $-IDT_BASE\r |
| 689 | dw 0 ; offset 15:0\r |
| 690 | dw SYS_CODE_SEL ; selector 15:0\r |
| 691 | db 0 ; 0 for interrupt gate\r |
| 692 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 693 | dw 0 ; offset 31:16\r |
| 694 | \r |
| 695 | ; SIMD floating-point exception (INT 13h)\r |
| 696 | SIMD_EXCEPTION_SEL equ $-IDT_BASE\r |
| 697 | dw 0 ; offset 15:0\r |
| 698 | dw SYS_CODE_SEL ; selector 15:0\r |
| 699 | db 0 ; 0 for interrupt gate\r |
| 700 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 701 | dw 0 ; offset 31:16\r |
| 702 | \r |
| 703 | ; 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r |
| 704 | db (85 * 8) dup(0)\r |
| 705 | \r |
| 706 | ; IRQ 0 (System timer) - (INT 68h)\r |
| 707 | IRQ0_SEL equ $-IDT_BASE\r |
| 708 | dw 0 ; offset 15:0\r |
| 709 | dw SYS_CODE_SEL ; selector 15:0\r |
| 710 | db 0 ; 0 for interrupt gate\r |
| 711 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 712 | dw 0 ; offset 31:16\r |
| 713 | \r |
| 714 | ; IRQ 1 (8042 Keyboard controller) - (INT 69h)\r |
| 715 | IRQ1_SEL equ $-IDT_BASE\r |
| 716 | dw 0 ; offset 15:0\r |
| 717 | dw SYS_CODE_SEL ; selector 15:0\r |
| 718 | db 0 ; 0 for interrupt gate\r |
| 719 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 720 | dw 0 ; offset 31:16\r |
| 721 | \r |
| 722 | ; Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r |
| 723 | IRQ2_SEL equ $-IDT_BASE\r |
| 724 | dw 0 ; offset 15:0\r |
| 725 | dw SYS_CODE_SEL ; selector 15:0\r |
| 726 | db 0 ; 0 for interrupt gate\r |
| 727 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 728 | dw 0 ; offset 31:16\r |
| 729 | \r |
| 730 | ; IRQ 3 (COM 2) - (INT 6bh)\r |
| 731 | IRQ3_SEL equ $-IDT_BASE\r |
| 732 | dw 0 ; offset 15:0\r |
| 733 | dw SYS_CODE_SEL ; selector 15:0\r |
| 734 | db 0 ; 0 for interrupt gate\r |
| 735 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 736 | dw 0 ; offset 31:16\r |
| 737 | \r |
| 738 | ; IRQ 4 (COM 1) - (INT 6ch)\r |
| 739 | IRQ4_SEL equ $-IDT_BASE\r |
| 740 | dw 0 ; offset 15:0\r |
| 741 | dw SYS_CODE_SEL ; selector 15:0\r |
| 742 | db 0 ; 0 for interrupt gate\r |
| 743 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 744 | dw 0 ; offset 31:16\r |
| 745 | \r |
| 746 | ; IRQ 5 (LPT 2) - (INT 6dh)\r |
| 747 | IRQ5_SEL equ $-IDT_BASE\r |
| 748 | dw 0 ; offset 15:0\r |
| 749 | dw SYS_CODE_SEL ; selector 15:0\r |
| 750 | db 0 ; 0 for interrupt gate\r |
| 751 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 752 | dw 0 ; offset 31:16\r |
| 753 | \r |
| 754 | ; IRQ 6 (Floppy controller) - (INT 6eh)\r |
| 755 | IRQ6_SEL equ $-IDT_BASE\r |
| 756 | dw 0 ; offset 15:0\r |
| 757 | dw SYS_CODE_SEL ; selector 15:0\r |
| 758 | db 0 ; 0 for interrupt gate\r |
| 759 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 760 | dw 0 ; offset 31:16\r |
| 761 | \r |
| 762 | ; IRQ 7 (LPT 1) - (INT 6fh)\r |
| 763 | IRQ7_SEL equ $-IDT_BASE\r |
| 764 | dw 0 ; offset 15:0\r |
| 765 | dw SYS_CODE_SEL ; selector 15:0\r |
| 766 | db 0 ; 0 for interrupt gate\r |
| 767 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 768 | dw 0 ; offset 31:16\r |
| 769 | \r |
| 770 | ; IRQ 8 (RTC Alarm) - (INT 70h)\r |
| 771 | IRQ8_SEL equ $-IDT_BASE\r |
| 772 | dw 0 ; offset 15:0\r |
| 773 | dw SYS_CODE_SEL ; selector 15:0\r |
| 774 | db 0 ; 0 for interrupt gate\r |
| 775 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 776 | dw 0 ; offset 31:16\r |
| 777 | \r |
| 778 | ; IRQ 9 - (INT 71h)\r |
| 779 | IRQ9_SEL equ $-IDT_BASE\r |
| 780 | dw 0 ; offset 15:0\r |
| 781 | dw SYS_CODE_SEL ; selector 15:0\r |
| 782 | db 0 ; 0 for interrupt gate\r |
| 783 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 784 | dw 0 ; offset 31:16\r |
| 785 | \r |
| 786 | ; IRQ 10 - (INT 72h)\r |
| 787 | IRQ10_SEL equ $-IDT_BASE\r |
| 788 | dw 0 ; offset 15:0\r |
| 789 | dw SYS_CODE_SEL ; selector 15:0\r |
| 790 | db 0 ; 0 for interrupt gate\r |
| 791 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 792 | dw 0 ; offset 31:16\r |
| 793 | \r |
| 794 | ; IRQ 11 - (INT 73h)\r |
| 795 | IRQ11_SEL equ $-IDT_BASE\r |
| 796 | dw 0 ; offset 15:0\r |
| 797 | dw SYS_CODE_SEL ; selector 15:0\r |
| 798 | db 0 ; 0 for interrupt gate\r |
| 799 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 800 | dw 0 ; offset 31:16\r |
| 801 | \r |
| 802 | ; IRQ 12 (PS/2 mouse) - (INT 74h)\r |
| 803 | IRQ12_SEL equ $-IDT_BASE\r |
| 804 | dw 0 ; offset 15:0\r |
| 805 | dw SYS_CODE_SEL ; selector 15:0\r |
| 806 | db 0 ; 0 for interrupt gate\r |
| 807 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 808 | dw 0 ; offset 31:16\r |
| 809 | \r |
| 810 | ; IRQ 13 (Floating point error) - (INT 75h)\r |
| 811 | IRQ13_SEL equ $-IDT_BASE\r |
| 812 | dw 0 ; offset 15:0\r |
| 813 | dw SYS_CODE_SEL ; selector 15:0\r |
| 814 | db 0 ; 0 for interrupt gate\r |
| 815 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 816 | dw 0 ; offset 31:16\r |
| 817 | \r |
| 818 | ; IRQ 14 (Secondary IDE) - (INT 76h)\r |
| 819 | IRQ14_SEL equ $-IDT_BASE\r |
| 820 | dw 0 ; offset 15:0\r |
| 821 | dw SYS_CODE_SEL ; selector 15:0\r |
| 822 | db 0 ; 0 for interrupt gate\r |
| 823 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 824 | dw 0 ; offset 31:16\r |
| 825 | \r |
| 826 | ; IRQ 15 (Primary IDE) - (INT 77h)\r |
| 827 | IRQ15_SEL equ $-IDT_BASE\r |
| 828 | dw 0 ; offset 15:0\r |
| 829 | dw SYS_CODE_SEL ; selector 15:0\r |
| 830 | db 0 ; 0 for interrupt gate\r |
| 831 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| 832 | dw 0 ; offset 31:16\r |
| 833 | \r |
| 834 | IDT_END:\r |
| 835 | \r |
| 836 | align 02h\r |
| 837 | \r |
| 838 | MemoryMapSize dd 0\r |
| 839 | MemoryMap dd 0,0,0,0,0,0,0,0\r |
| 840 | dd 0,0,0,0,0,0,0,0\r |
| 841 | dd 0,0,0,0,0,0,0,0\r |
| 842 | dd 0,0,0,0,0,0,0,0\r |
| 843 | dd 0,0,0,0,0,0,0,0\r |
| 844 | dd 0,0,0,0,0,0,0,0\r |
| 845 | dd 0,0,0,0,0,0,0,0\r |
| 846 | dd 0,0,0,0,0,0,0,0\r |
| 847 | dd 0,0,0,0,0,0,0,0\r |
| 848 | dd 0,0,0,0,0,0,0,0\r |
| 849 | dd 0,0,0,0,0,0,0,0\r |
| 850 | dd 0,0,0,0,0,0,0,0\r |
| 851 | dd 0,0,0,0,0,0,0,0\r |
| 852 | dd 0,0,0,0,0,0,0,0\r |
| 853 | dd 0,0,0,0,0,0,0,0\r |
| 854 | dd 0,0,0,0,0,0,0,0\r |
| 855 | dd 0,0,0,0,0,0,0,0\r |
| 856 | dd 0,0,0,0,0,0,0,0\r |
| 857 | dd 0,0,0,0,0,0,0,0\r |
| 858 | dd 0,0,0,0,0,0,0,0\r |
| 859 | dd 0,0,0,0,0,0,0,0\r |
| 860 | dd 0,0,0,0,0,0,0,0\r |
| 861 | dd 0,0,0,0,0,0,0,0\r |
| 862 | dd 0,0,0,0,0,0,0,0\r |
| 863 | dd 0,0,0,0,0,0,0,0\r |
| 864 | dd 0,0,0,0,0,0,0,0\r |
| 865 | dd 0,0,0,0,0,0,0,0\r |
| 866 | dd 0,0,0,0,0,0,0,0\r |
| 867 | dd 0,0,0,0,0,0,0,0\r |
| 868 | dd 0,0,0,0,0,0,0,0\r |
| 869 | \r |
| 870 | dd 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r |
| 871 | dd 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r |
| 872 | \r |
| 873 | org 0fe0h\r |
| 874 | MyStack: \r |
| 875 | ; below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r |
| 876 | ; back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r |
| 877 | ; known low address (20f00) so it can be set up by PlMapIrqToVect in\r |
| 878 | ; 8259.c\r |
| 879 | \r |
| 880 | int 8\r |
| 881 | iret\r |
| 882 | \r |
| 883 | int 9\r |
| 884 | iret\r |
| 885 | \r |
| 886 | int 10\r |
| 887 | iret\r |
| 888 | \r |
| 889 | int 11\r |
| 890 | iret\r |
| 891 | \r |
| 892 | int 12\r |
| 893 | iret\r |
| 894 | \r |
| 895 | int 13\r |
| 896 | iret\r |
| 897 | \r |
| 898 | int 14\r |
| 899 | iret\r |
| 900 | \r |
| 901 | int 15\r |
| 902 | iret\r |
| 903 | \r |
| 904 | \r |
| 905 | org 0ffeh\r |
| 906 | BlockSignature:\r |
| 907 | dw 0aa55h\r |
| 908 | \r |
| 909 | end \r |
projects / mirror_edk2.git / blame