| | 1 | ;------------------------------------------------------------------------------\r |
| | 2 | ;*\r |
| | 3 | ;* Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r |
| | 4 | ;* This program and the accompanying materials \r |
| | 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 | ;* start32.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 | SectorSize dw 0 ; Sector Size - 2 bytes\r |
| | 36 | SectorsPerCluster db 0 ; Sector Per Cluster - 1 byte\r |
| | 37 | ReservedSectors dw 0 ; Reserved Sectors - 2 bytes\r |
| | 38 | NoFats db 0 ; Number of FATs - 1 byte\r |
| | 39 | RootEntries dw 0 ; Root Entries - 2 bytes\r |
| | 40 | Sectors dw 0 ; Number of Sectors - 2 bytes\r |
| | 41 | Media db 0 ; Media - 1 byte\r |
| | 42 | SectorsPerFat16 dw 0 ; Sectors Per FAT for FAT12/FAT16 - 2 byte\r |
| | 43 | SectorsPerTrack dw 0 ; Sectors Per Track - 2 bytes\r |
| | 44 | Heads dw 0 ; Heads - 2 bytes\r |
| | 45 | HiddenSectors dd 0 ; Hidden Sectors - 4 bytes\r |
| | 46 | LargeSectors dd 0 ; Large Sectors - 4 bytes\r |
| | 47 | \r |
| | 48 | ;******************************************************************************\r |
| | 49 | ;\r |
| | 50 | ;The structure for FAT32 starting at offset 36 of the boot sector. (At this point, \r |
| | 51 | ;the BPB/boot sector for FAT12 and FAT16 differs from the BPB/boot sector for FAT32.)\r |
| | 52 | ;\r |
| | 53 | ;******************************************************************************\r |
| | 54 | \r |
| | 55 | SectorsPerFat32 dd 0 ; Sectors Per FAT for FAT32 - 4 bytes\r |
| | 56 | ExtFlags dw 0 ; Mirror Flag - 2 bytes\r |
| | 57 | FSVersion dw 0 ; File System Version - 2 bytes\r |
| | 58 | RootCluster dd 0 ; 1st Cluster Number of Root Dir - 4 bytes\r |
| | 59 | FSInfo dw 0 ; Sector Number of FSINFO - 2 bytes\r |
| | 60 | BkBootSector dw 0 ; Sector Number of Bk BootSector - 2 bytes\r |
| | 61 | Reserved db 12 dup(0) ; Reserved Field - 12 bytes\r |
| | 62 | PhysicalDrive db 0 ; Physical Drive Number - 1 byte\r |
| | 63 | Reserved1 db 0 ; Reserved Field - 1 byte\r |
| | 64 | Signature db 0 ; Extended Boot Signature - 1 byte\r |
| | 65 | VolId db " " ; Volume Serial Number - 4 bytes\r |
| | 66 | FatLabel db " " ; Volume Label - 11 bytes\r |
| | 67 | FileSystemType db "FAT32 " ; File System Type - 8 bytes\r |
| | 68 | \r |
| | 69 | BootSectorEntryPoint:\r |
| | 70 | ASSUME ds:@code\r |
| | 71 | ASSUME ss:@code\r |
| | 72 | ; ds = 1000, es = 2000 + x (size of first cluster >> 4)\r |
| | 73 | ; cx = Start Cluster of EfiLdr\r |
| | 74 | ; dx = Start Cluster of Efivar.bin\r |
| | 75 | \r |
| | 76 | ; Re use the BPB data stored in Boot Sector\r |
| | 77 | mov bp,07c00h\r |
| | 78 | \r |
| | 79 | \r |
| | 80 | push cx\r |
| | 81 | ; Read Efivar.bin\r |
| | 82 | ; 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r |
| | 83 | mov ax,01900h\r |
| | 84 | mov es,ax\r |
| | 85 | test dx,dx\r |
| | 86 | jnz CheckVarStoreSize\r |
| | 87 | \r |
| | 88 | mov al,1\r |
| | 89 | NoVarStore:\r |
| | 90 | push es\r |
| | 91 | ; Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r |
| | 92 | mov byte ptr es:[4],al\r |
| | 93 | jmp SaveVolumeId\r |
| | 94 | \r |
| | 95 | CheckVarStoreSize:\r |
| | 96 | mov di,dx\r |
| | 97 | cmp dword ptr ds:[di+2], 04000h\r |
| | 98 | mov al,2\r |
| | 99 | jne NoVarStore\r |
| | 100 | \r |
| | 101 | LoadVarStore:\r |
| | 102 | mov al,0\r |
| | 103 | mov byte ptr es:[4],al\r |
| | 104 | mov cx,word ptr[di]\r |
| | 105 | ; ES:DI = 1500:0\r |
| | 106 | xor di,di\r |
| | 107 | push es\r |
| | 108 | mov ax,01500h\r |
| | 109 | mov es,ax\r |
| | 110 | call ReadFile\r |
| | 111 | SaveVolumeId:\r |
| | 112 | pop es\r |
| | 113 | mov ax,word ptr [bp+VolId]\r |
| | 114 | mov word ptr es:[0],ax ; Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r |
| | 115 | mov ax,word ptr [bp+VolId+2]\r |
| | 116 | mov word ptr es:[2],ax\r |
| | 117 | \r |
| | 118 | ; Read Efildr\r |
| | 119 | pop cx\r |
| | 120 | ; cx = Start Cluster of Efildr -> BS.com has filled already\r |
| | 121 | ; ES:DI = 2000:0, first cluster will be read again\r |
| | 122 | xor di,di ; di = 0\r |
| | 123 | mov ax,02000h\r |
| | 124 | mov es,ax\r |
| | 125 | call ReadFile\r |
| | 126 | mov ax,cs\r |
| | 127 | mov word ptr cs:[JumpSegment],ax\r |
| | 128 | JumpFarInstruction:\r |
| | 129 | db 0eah\r |
| | 130 | JumpOffset:\r |
| | 131 | dw 0200h\r |
| | 132 | JumpSegment:\r |
| | 133 | dw 2000h\r |
| | 134 | \r |
| | 135 | \r |
| | 136 | \r |
| | 137 | \r |
| | 138 | ; ****************************************************************************\r |
| | 139 | ; ReadFile\r |
| | 140 | ;\r |
| | 141 | ; Arguments:\r |
| | 142 | ; CX = Start Cluster of File\r |
| | 143 | ; ES:DI = Buffer to store file content read from disk\r |
| | 144 | ;\r |
| | 145 | ; Return:\r |
| | 146 | ; (ES << 4 + DI) = end of file content Buffer\r |
| | 147 | ;\r |
| | 148 | ; ****************************************************************************\r |
| | 149 | ReadFile:\r |
| | 150 | ; si = NumberOfClusters\r |
| | 151 | ; cx = ClusterNumber\r |
| | 152 | ; dx = CachedFatSectorNumber\r |
| | 153 | ; ds:0000 = CacheFatSectorBuffer\r |
| | 154 | ; es:di = Buffer to load file\r |
| | 155 | ; bx = NextClusterNumber\r |
| | 156 | pusha\r |
| | 157 | mov si,1 ; NumberOfClusters = 1\r |
| | 158 | push cx ; Push Start Cluster onto stack\r |
| | 159 | mov dx,0fffh ; CachedFatSectorNumber = 0xfff\r |
| | 160 | FatChainLoop:\r |
| | 161 | mov ax,cx ; ax = ClusterNumber \r |
| | 162 | and ax,0fff8h ; ax = ax & 0xfff8\r |
| | 163 | cmp ax,0fff8h ; See if this is the last cluster\r |
| | 164 | je FoundLastCluster ; Jump if last cluster found\r |
| | 165 | mov ax,cx ; ax = ClusterNumber\r |
| | 166 | shl ax,2 ; FatOffset = ClusterNumber * 4\r |
| | 167 | push si ; Save si\r |
| | 168 | mov si,ax ; si = FatOffset\r |
| | 169 | shr ax,BLOCK_SHIFT ; ax = FatOffset >> BLOCK_SHIFT\r |
| | 170 | add ax,word ptr [bp+ReservedSectors] ; ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r |
| | 171 | and si,BLOCK_MASK ; si = FatOffset & BLOCK_MASK\r |
| | 172 | cmp ax,dx ; Compare FatSectorNumber to CachedFatSectorNumber\r |
| | 173 | je SkipFatRead\r |
| | 174 | mov bx,2 \r |
| | 175 | push es\r |
| | 176 | push ds\r |
| | 177 | pop es\r |
| | 178 | call ReadBlocks ; Read 2 blocks starting at AX storing at ES:DI\r |
| | 179 | pop es\r |
| | 180 | mov dx,ax ; CachedFatSectorNumber = FatSectorNumber\r |
| | 181 | SkipFatRead:\r |
| | 182 | mov bx,word ptr [si] ; bx = NextClusterNumber\r |
| | 183 | mov ax,cx ; ax = ClusterNumber\r |
| | 184 | pop si ; Restore si\r |
| | 185 | dec bx ; bx = NextClusterNumber - 1\r |
| | 186 | cmp bx,cx ; See if (NextClusterNumber-1)==ClusterNumber\r |
| | 187 | jne ReadClusters\r |
| | 188 | inc bx ; bx = NextClusterNumber\r |
| | 189 | inc si ; NumberOfClusters++\r |
| | 190 | mov cx,bx ; ClusterNumber = NextClusterNumber\r |
| | 191 | jmp FatChainLoop\r |
| | 192 | ReadClusters:\r |
| | 193 | inc bx\r |
| | 194 | pop ax ; ax = StartCluster\r |
| | 195 | push bx ; StartCluster = NextClusterNumber\r |
| | 196 | mov cx,bx ; ClusterNumber = NextClusterNumber\r |
| | 197 | sub ax,2 ; ax = StartCluster - 2\r |
| | 198 | xor bh,bh \r |
| | 199 | mov bl,byte ptr [bp+SectorsPerCluster] ; bx = SectorsPerCluster\r |
| | 200 | mul bx ; ax = (StartCluster - 2) * SectorsPerCluster\r |
| | 201 | add ax, word ptr [bp] ; ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r |
| | 202 | push ax ; save start sector\r |
| | 203 | mov ax,si ; ax = NumberOfClusters\r |
| | 204 | mul bx ; ax = NumberOfClusters * SectorsPerCluster\r |
| | 205 | mov bx,ax ; bx = Number of Sectors\r |
| | 206 | pop ax ; ax = Start Sector\r |
| | 207 | call ReadBlocks\r |
| | 208 | mov si,1 ; NumberOfClusters = 1\r |
| | 209 | jmp FatChainLoop\r |
| | 210 | FoundLastCluster:\r |
| | 211 | pop cx\r |
| | 212 | popa\r |
| | 213 | ret\r |
| | 214 | \r |
| | 215 | \r |
| | 216 | ; ****************************************************************************\r |
| | 217 | ; ReadBlocks - Reads a set of blocks from a block device\r |
| | 218 | ;\r |
| | 219 | ; AX = Start LBA\r |
| | 220 | ; BX = Number of Blocks to Read\r |
| | 221 | ; ES:DI = Buffer to store sectors read from disk\r |
| | 222 | ; ****************************************************************************\r |
| | 223 | \r |
| | 224 | ; cx = Blocks\r |
| | 225 | ; bx = NumberOfBlocks\r |
| | 226 | ; si = StartLBA\r |
| | 227 | \r |
| | 228 | ReadBlocks:\r |
| | 229 | pusha\r |
| | 230 | add eax,dword ptr [bp+LBAOffsetForBootSector] ; Add LBAOffsetForBootSector to Start LBA\r |
| | 231 | add eax,dword ptr [bp+HiddenSectors] ; Add HiddenSectors to Start LBA\r |
| | 232 | mov esi,eax ; esi = Start LBA\r |
| | 233 | mov cx,bx ; cx = Number of blocks to read\r |
| | 234 | ReadCylinderLoop:\r |
| | 235 | mov bp,07bfch ; bp = 0x7bfc\r |
| | 236 | mov eax,esi ; eax = Start LBA\r |
| | 237 | xor edx,edx ; edx = 0\r |
| | 238 | movzx ebx,word ptr [bp] ; bx = MaxSector\r |
| | 239 | div ebx ; ax = StartLBA / MaxSector\r |
| | 240 | inc dx ; dx = (StartLBA % MaxSector) + 1\r |
| | 241 | \r |
| | 242 | mov bx,word ptr [bp] ; bx = MaxSector\r |
| | 243 | sub bx,dx ; bx = MaxSector - Sector\r |
| | 244 | inc bx ; bx = MaxSector - Sector + 1\r |
| | 245 | cmp cx,bx ; Compare (Blocks) to (MaxSector - Sector + 1)\r |
| | 246 | jg LimitTransfer\r |
| | 247 | mov bx,cx ; bx = Blocks\r |
| | 248 | LimitTransfer:\r |
| | 249 | push ax ; save ax\r |
| | 250 | mov ax,es ; ax = es\r |
| | 251 | shr ax,(BLOCK_SHIFT-4) ; ax = Number of blocks into mem system\r |
| | 252 | and ax,07fh ; ax = Number of blocks into current seg\r |
| | 253 | add ax,bx ; ax = End Block number of transfer\r |
| | 254 | cmp ax,080h ; See if it crosses a 64K boundry\r |
| | 255 | jle NotCrossing64KBoundry ; Branch if not crossing 64K boundry\r |
| | 256 | sub ax,080h ; ax = Number of blocks past 64K boundry\r |
| | 257 | sub bx,ax ; Decrease transfer size by block overage\r |
| | 258 | NotCrossing64KBoundry:\r |
| | 259 | pop ax ; restore ax\r |
| | 260 | \r |
| | 261 | push cx\r |
| | 262 | mov cl,dl ; cl = (StartLBA % MaxSector) + 1 = Sector\r |
| | 263 | xor dx,dx ; dx = 0\r |
| | 264 | div word ptr [bp+2] ; ax = ax / (MaxHead + 1) = Cylinder \r |
| | 265 | ; dx = ax % (MaxHead + 1) = Head\r |
| | 266 | \r |
| | 267 | push bx ; Save number of blocks to transfer\r |
| | 268 | mov dh,dl ; dh = Head\r |
| | 269 | mov bp,07c00h ; bp = 0x7c00\r |
| | 270 | mov dl,byte ptr [bp+PhysicalDrive] ; dl = Drive Number\r |
| | 271 | mov ch,al ; ch = Cylinder\r |
| | 272 | mov al,bl ; al = Blocks\r |
| | 273 | mov ah,2 ; ah = Function 2\r |
| | 274 | mov bx,di ; es:bx = Buffer address\r |
| | 275 | int 013h\r |
| | 276 | jc DiskError\r |
| | 277 | pop bx\r |
| | 278 | pop cx\r |
| | 279 | movzx ebx,bx\r |
| | 280 | add esi,ebx ; StartLBA = StartLBA + NumberOfBlocks\r |
| | 281 | sub cx,bx ; Blocks = Blocks - NumberOfBlocks\r |
| | 282 | mov ax,es\r |
| | 283 | shl bx,(BLOCK_SHIFT-4)\r |
| | 284 | add ax,bx\r |
| | 285 | mov es,ax ; es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r |
| | 286 | cmp cx,0\r |
| | 287 | jne ReadCylinderLoop\r |
| | 288 | popa\r |
| | 289 | ret\r |
| | 290 | \r |
| | 291 | DiskError:\r |
| | 292 | push cs\r |
| | 293 | pop ds\r |
| | 294 | lea si, [ErrorString]\r |
| | 295 | mov cx, 7\r |
| | 296 | jmp PrintStringAndHalt\r |
| | 297 | \r |
| | 298 | PrintStringAndHalt:\r |
| | 299 | mov ax,0b800h\r |
| | 300 | mov es,ax\r |
| | 301 | mov di,160\r |
| | 302 | rep movsw\r |
| | 303 | Halt:\r |
| | 304 | jmp Halt\r |
| | 305 | \r |
| | 306 | ErrorString:\r |
| | 307 | db 'S', 0ch, 'E', 0ch, 'r', 0ch, 'r', 0ch, 'o', 0ch, 'r', 0ch, '!', 0ch\r |
| | 308 | \r |
| | 309 | org 01fah\r |
| | 310 | LBAOffsetForBootSector:\r |
| | 311 | dd 0h\r |
| | 312 | \r |
| | 313 | org 01feh\r |
| | 314 | dw 0aa55h\r |
| | 315 | \r |
| | 316 | ;******************************************************************************\r |
| | 317 | ;******************************************************************************\r |
| | 318 | ;******************************************************************************\r |
| | 319 | \r |
| | 320 | DELAY_PORT equ 0edh ; Port to use for 1uS delay\r |
| | 321 | KBD_CONTROL_PORT equ 060h ; 8042 control port \r |
| | 322 | KBD_STATUS_PORT equ 064h ; 8042 status port \r |
| | 323 | WRITE_DATA_PORT_CMD equ 0d1h ; 8042 command to write the data port\r |
| | 324 | ENABLE_A20_CMD equ 0dfh ; 8042 command to enable A20\r |
| | 325 | \r |
| | 326 | org 200h\r |
| | 327 | jmp start\r |
| | 328 | Em64String:\r |
| | 329 | 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 |
| | 330 | \r |
| | 331 | start: \r |
| | 332 | mov ax,cs\r |
| | 333 | mov ds,ax\r |
| | 334 | mov es,ax\r |
| | 335 | mov ss,ax\r |
| | 336 | mov sp,MyStack\r |
| | 337 | \r |
| | 338 | ; mov ax,0b800h\r |
| | 339 | ; mov es,ax\r |
| | 340 | ; mov byte ptr es:[160],'a'\r |
| | 341 | ; mov ax,cs\r |
| | 342 | ; mov es,ax\r |
| | 343 | \r |
| | 344 | mov ebx,0\r |
| | 345 | lea edi,MemoryMap\r |
| | 346 | MemMapLoop:\r |
| | 347 | mov eax,0e820h\r |
| | 348 | mov ecx,20\r |
| | 349 | mov edx,'SMAP'\r |
| | 350 | int 15h\r |
| | 351 | jc MemMapDone\r |
| | 352 | add edi,20\r |
| | 353 | cmp ebx,0\r |
| | 354 | je MemMapDone\r |
| | 355 | jmp MemMapLoop\r |
| | 356 | MemMapDone:\r |
| | 357 | lea eax,MemoryMap\r |
| | 358 | sub edi,eax ; Get the address of the memory map\r |
| | 359 | mov dword ptr [MemoryMapSize],edi ; Save the size of the memory map\r |
| | 360 | \r |
| | 361 | xor ebx,ebx\r |
| | 362 | mov bx,cs ; BX=segment\r |
| | 363 | shl ebx,4 ; BX="linear" address of segment base\r |
| | 364 | lea eax,[GDT_BASE + ebx] ; EAX=PHYSICAL address of gdt\r |
| | 365 | mov dword ptr [gdtr + 2],eax ; Put address of gdt into the gdtr\r |
| | 366 | lea eax,[IDT_BASE + ebx] ; EAX=PHYSICAL address of idt\r |
| | 367 | mov dword ptr [idtr + 2],eax ; Put address of idt into the idtr\r |
| | 368 | lea edx,[MemoryMapSize + ebx] ; Physical base address of the memory map\r |
| | 369 | \r |
| | 370 | add ebx,01000h ; Source of EFI32\r |
| | 371 | mov dword ptr [JUMP+2],ebx\r |
| | 372 | add ebx,01000h\r |
| | 373 | mov esi,ebx ; Source of EFILDR32\r |
| | 374 | \r |
| | 375 | ; mov ax,0b800h\r |
| | 376 | ; mov es,ax\r |
| | 377 | ; mov byte ptr es:[162],'b'\r |
| | 378 | ; mov ax,cs\r |
| | 379 | ; mov es,ax\r |
| | 380 | \r |
| | 381 | ;\r |
| | 382 | ; Enable A20 Gate \r |
| | 383 | ;\r |
| | 384 | \r |
| | 385 | mov ax,2401h ; Enable A20 Gate\r |
| | 386 | int 15h\r |
| | 387 | jnc A20GateEnabled ; Jump if it suceeded\r |
| | 388 | \r |
| | 389 | ;\r |
| | 390 | ; If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r |
| | 391 | ;\r |
| | 392 | \r |
| | 393 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r |
| | 394 | jnz Timeout8042 ; Jump if the 8042 timed out\r |
| | 395 | out DELAY_PORT,ax ; Delay 1 uS\r |
| | 396 | mov al,WRITE_DATA_PORT_CMD ; 8042 cmd to write output port\r |
| | 397 | out KBD_STATUS_PORT,al ; Send command to the 8042\r |
| | 398 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r |
| | 399 | jnz Timeout8042 ; Jump if the 8042 timed out\r |
| | 400 | mov al,ENABLE_A20_CMD ; gate address bit 20 on\r |
| | 401 | out KBD_CONTROL_PORT,al ; Send command to thre 8042\r |
| | 402 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r |
| | 403 | mov cx,25 ; Delay 25 uS for the command to complete on the 8042\r |
| | 404 | Delay25uS:\r |
| | 405 | out DELAY_PORT,ax ; Delay 1 uS\r |
| | 406 | loop Delay25uS \r |
| | 407 | Timeout8042:\r |
| | 408 | \r |
| | 409 | \r |
| | 410 | A20GateEnabled:\r |
| | 411 | mov bx,0008h ; Flat data descriptor\r |
| | 412 | ;\r |
| | 413 | ; DISABLE INTERRUPTS - Entering Protected Mode\r |
| | 414 | ;\r |
| | 415 | \r |
| | 416 | cli \r |
| | 417 | \r |
| | 418 | ; mov ax,0b800h\r |
| | 419 | ; mov es,ax\r |
| | 420 | ; mov byte ptr es:[164],'c'\r |
| | 421 | ; mov ax,cs\r |
| | 422 | ; mov es,ax\r |
| | 423 | \r |
| | 424 | db 66h \r |
| | 425 | lgdt fword ptr [gdtr]\r |
| | 426 | db 66h \r |
| | 427 | lidt fword ptr [idtr]\r |
| | 428 | \r |
| | 429 | mov eax,cr0\r |
| | 430 | or al,1\r |
| | 431 | mov cr0,eax\r |
| | 432 | JUMP:\r |
| | 433 | ; jmp far 0010:00020000\r |
| | 434 | db 066h\r |
| | 435 | db 0eah\r |
| | 436 | dd 000020000h\r |
| | 437 | dw 00010h\r |
| | 438 | \r |
| | 439 | Empty8042InputBuffer:\r |
| | 440 | mov cx,0\r |
| | 441 | Empty8042Loop:\r |
| | 442 | out DELAY_PORT,ax ; Delay 1us\r |
| | 443 | in al,KBD_STATUS_PORT ; Read the 8042 Status Port\r |
| | 444 | and al,02h ; Check the Input Buffer Full Flag\r |
| | 445 | loopnz Empty8042Loop ; Loop until the input buffer is empty or a timout of 65536 uS\r |
| | 446 | ret\r |
| | 447 | \r |
| | 448 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| | 449 | ; data\r |
| | 450 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| | 451 | \r |
| | 452 | align 02h\r |
| | 453 | \r |
| | 454 | gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit\r |
| | 455 | dd 0 ; (GDT base gets set above)\r |
| | 456 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| | 457 | ; global descriptor table (GDT)\r |
| | 458 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| | 459 | \r |
| | 460 | align 02h\r |
| | 461 | \r |
| | 462 | public GDT_BASE\r |
| | 463 | GDT_BASE:\r |
| | 464 | ; null descriptor\r |
| | 465 | NULL_SEL equ $-GDT_BASE\r |
| | 466 | dw 0 ; limit 15:0\r |
| | 467 | dw 0 ; base 15:0\r |
| | 468 | db 0 ; base 23:16\r |
| | 469 | db 0 ; type\r |
| | 470 | db 0 ; limit 19:16, flags\r |
| | 471 | db 0 ; base 31:24\r |
| | 472 | \r |
| | 473 | ; linear data segment descriptor\r |
| | 474 | LINEAR_SEL equ $-GDT_BASE\r |
| | 475 | dw 0FFFFh ; limit 0xFFFFF\r |
| | 476 | dw 0 ; base 0\r |
| | 477 | db 0\r |
| | 478 | db 092h ; present, ring 0, data, expand-up, writable\r |
| | 479 | db 0CFh ; page-granular, 32-bit\r |
| | 480 | db 0\r |
| | 481 | \r |
| | 482 | ; linear code segment descriptor\r |
| | 483 | LINEAR_CODE_SEL equ $-GDT_BASE\r |
| | 484 | dw 0FFFFh ; limit 0xFFFFF\r |
| | 485 | dw 0 ; base 0\r |
| | 486 | db 0\r |
| | 487 | db 09Ah ; present, ring 0, data, expand-up, writable\r |
| | 488 | db 0CFh ; page-granular, 32-bit\r |
| | 489 | db 0\r |
| | 490 | \r |
| | 491 | ; system data segment descriptor\r |
| | 492 | SYS_DATA_SEL equ $-GDT_BASE\r |
| | 493 | dw 0FFFFh ; limit 0xFFFFF\r |
| | 494 | dw 0 ; base 0\r |
| | 495 | db 0\r |
| | 496 | db 092h ; present, ring 0, data, expand-up, writable\r |
| | 497 | db 0CFh ; page-granular, 32-bit\r |
| | 498 | db 0\r |
| | 499 | \r |
| | 500 | ; system code segment descriptor\r |
| | 501 | SYS_CODE_SEL equ $-GDT_BASE\r |
| | 502 | dw 0FFFFh ; limit 0xFFFFF\r |
| | 503 | dw 0 ; base 0\r |
| | 504 | db 0\r |
| | 505 | db 09Ah ; present, ring 0, data, expand-up, writable\r |
| | 506 | db 0CFh ; page-granular, 32-bit\r |
| | 507 | db 0\r |
| | 508 | \r |
| | 509 | ; spare segment descriptor\r |
| | 510 | SPARE3_SEL equ $-GDT_BASE\r |
| | 511 | dw 0 ; limit 0xFFFFF\r |
| | 512 | dw 0 ; base 0\r |
| | 513 | db 0\r |
| | 514 | db 0 ; present, ring 0, data, expand-up, writable\r |
| | 515 | db 0 ; page-granular, 32-bit\r |
| | 516 | db 0\r |
| | 517 | \r |
| | 518 | ; spare segment descriptor\r |
| | 519 | SPARE4_SEL equ $-GDT_BASE\r |
| | 520 | dw 0 ; limit 0xFFFFF\r |
| | 521 | dw 0 ; base 0\r |
| | 522 | db 0\r |
| | 523 | db 0 ; present, ring 0, data, expand-up, writable\r |
| | 524 | db 0 ; page-granular, 32-bit\r |
| | 525 | db 0\r |
| | 526 | \r |
| | 527 | ; spare segment descriptor\r |
| | 528 | SPARE5_SEL equ $-GDT_BASE\r |
| | 529 | dw 0 ; limit 0xFFFFF\r |
| | 530 | dw 0 ; base 0\r |
| | 531 | db 0\r |
| | 532 | db 0 ; present, ring 0, data, expand-up, writable\r |
| | 533 | db 0 ; page-granular, 32-bit\r |
| | 534 | db 0\r |
| | 535 | \r |
| | 536 | GDT_END:\r |
| | 537 | \r |
| | 538 | align 02h\r |
| | 539 | \r |
| | 540 | \r |
| | 541 | \r |
| | 542 | idtr dw IDT_END - IDT_BASE - 1 ; IDT limit\r |
| | 543 | dd 0 ; (IDT base gets set above)\r |
| | 544 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| | 545 | ; interrupt descriptor table (IDT)\r |
| | 546 | ;\r |
| | 547 | ; Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r |
| | 548 | ; mappings. This implementation only uses the system timer and all other\r |
| | 549 | ; IRQs will remain masked. The descriptors for vectors 33+ are provided\r |
| | 550 | ; for convenience.\r |
| | 551 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r |
| | 552 | \r |
| | 553 | ;idt_tag db "IDT",0 \r |
| | 554 | align 02h\r |
| | 555 | \r |
| | 556 | public IDT_BASE\r |
| | 557 | IDT_BASE:\r |
| | 558 | ; divide by zero (INT 0)\r |
| | 559 | DIV_ZERO_SEL equ $-IDT_BASE\r |
| | 560 | dw 0 ; offset 15:0\r |
| | 561 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 562 | db 0 ; 0 for interrupt gate\r |
| | 563 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 564 | dw 0 ; offset 31:16\r |
| | 565 | \r |
| | 566 | ; debug exception (INT 1)\r |
| | 567 | DEBUG_EXCEPT_SEL equ $-IDT_BASE\r |
| | 568 | dw 0 ; offset 15:0\r |
| | 569 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 570 | db 0 ; 0 for interrupt gate\r |
| | 571 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 572 | dw 0 ; offset 31:16\r |
| | 573 | \r |
| | 574 | ; NMI (INT 2)\r |
| | 575 | NMI_SEL equ $-IDT_BASE\r |
| | 576 | dw 0 ; offset 15:0\r |
| | 577 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 578 | db 0 ; 0 for interrupt gate\r |
| | 579 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 580 | dw 0 ; offset 31:16\r |
| | 581 | \r |
| | 582 | ; soft breakpoint (INT 3)\r |
| | 583 | BREAKPOINT_SEL equ $-IDT_BASE\r |
| | 584 | dw 0 ; offset 15:0\r |
| | 585 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 586 | db 0 ; 0 for interrupt gate\r |
| | 587 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 588 | dw 0 ; offset 31:16\r |
| | 589 | \r |
| | 590 | ; overflow (INT 4)\r |
| | 591 | OVERFLOW_SEL equ $-IDT_BASE\r |
| | 592 | dw 0 ; offset 15:0\r |
| | 593 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 594 | db 0 ; 0 for interrupt gate\r |
| | 595 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 596 | dw 0 ; offset 31:16\r |
| | 597 | \r |
| | 598 | ; bounds check (INT 5)\r |
| | 599 | BOUNDS_CHECK_SEL equ $-IDT_BASE\r |
| | 600 | dw 0 ; offset 15:0\r |
| | 601 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 602 | db 0 ; 0 for interrupt gate\r |
| | 603 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 604 | dw 0 ; offset 31:16\r |
| | 605 | \r |
| | 606 | ; invalid opcode (INT 6)\r |
| | 607 | INVALID_OPCODE_SEL equ $-IDT_BASE\r |
| | 608 | dw 0 ; offset 15:0\r |
| | 609 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 610 | db 0 ; 0 for interrupt gate\r |
| | 611 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 612 | dw 0 ; offset 31:16\r |
| | 613 | \r |
| | 614 | ; device not available (INT 7)\r |
| | 615 | DEV_NOT_AVAIL_SEL equ $-IDT_BASE\r |
| | 616 | dw 0 ; offset 15:0\r |
| | 617 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 618 | db 0 ; 0 for interrupt gate\r |
| | 619 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 620 | dw 0 ; offset 31:16\r |
| | 621 | \r |
| | 622 | ; double fault (INT 8)\r |
| | 623 | DOUBLE_FAULT_SEL equ $-IDT_BASE\r |
| | 624 | dw 0 ; offset 15:0\r |
| | 625 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 626 | db 0 ; 0 for interrupt gate\r |
| | 627 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 628 | dw 0 ; offset 31:16\r |
| | 629 | \r |
| | 630 | ; Coprocessor segment overrun - reserved (INT 9)\r |
| | 631 | RSVD_INTR_SEL1 equ $-IDT_BASE\r |
| | 632 | dw 0 ; offset 15:0\r |
| | 633 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 634 | db 0 ; 0 for interrupt gate\r |
| | 635 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 636 | dw 0 ; offset 31:16\r |
| | 637 | \r |
| | 638 | ; invalid TSS (INT 0ah)\r |
| | 639 | INVALID_TSS_SEL equ $-IDT_BASE\r |
| | 640 | dw 0 ; offset 15:0\r |
| | 641 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 642 | db 0 ; 0 for interrupt gate\r |
| | 643 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 644 | dw 0 ; offset 31:16\r |
| | 645 | \r |
| | 646 | ; segment not present (INT 0bh)\r |
| | 647 | SEG_NOT_PRESENT_SEL equ $-IDT_BASE\r |
| | 648 | dw 0 ; offset 15:0\r |
| | 649 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 650 | db 0 ; 0 for interrupt gate\r |
| | 651 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 652 | dw 0 ; offset 31:16\r |
| | 653 | \r |
| | 654 | ; stack fault (INT 0ch)\r |
| | 655 | STACK_FAULT_SEL equ $-IDT_BASE\r |
| | 656 | dw 0 ; offset 15:0\r |
| | 657 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 658 | db 0 ; 0 for interrupt gate\r |
| | 659 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 660 | dw 0 ; offset 31:16\r |
| | 661 | \r |
| | 662 | ; general protection (INT 0dh)\r |
| | 663 | GP_FAULT_SEL equ $-IDT_BASE\r |
| | 664 | dw 0 ; offset 15:0\r |
| | 665 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 666 | db 0 ; 0 for interrupt gate\r |
| | 667 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 668 | dw 0 ; offset 31:16\r |
| | 669 | \r |
| | 670 | ; page fault (INT 0eh)\r |
| | 671 | PAGE_FAULT_SEL equ $-IDT_BASE\r |
| | 672 | dw 0 ; offset 15:0\r |
| | 673 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 674 | db 0 ; 0 for interrupt gate\r |
| | 675 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 676 | dw 0 ; offset 31:16\r |
| | 677 | \r |
| | 678 | ; Intel reserved - do not use (INT 0fh)\r |
| | 679 | RSVD_INTR_SEL2 equ $-IDT_BASE\r |
| | 680 | dw 0 ; offset 15:0\r |
| | 681 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 682 | db 0 ; 0 for interrupt gate\r |
| | 683 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 684 | dw 0 ; offset 31:16\r |
| | 685 | \r |
| | 686 | ; floating point error (INT 10h)\r |
| | 687 | FLT_POINT_ERR_SEL equ $-IDT_BASE\r |
| | 688 | dw 0 ; offset 15:0\r |
| | 689 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 690 | db 0 ; 0 for interrupt gate\r |
| | 691 | db 0eh OR 80h ; type = 386 interrupt gate, present\r |
| | 692 | dw 0 ; offset 31:16\r |
| | 693 | \r |
| | 694 | ; alignment check (INT 11h)\r |
| | 695 | ALIGNMENT_CHECK_SEL equ $-IDT_BASE\r |
| | 696 | dw 0 ; offset 15:0\r |
| | 697 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 698 | db 0 ; 0 for interrupt gate\r |
| | 699 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 700 | dw 0 ; offset 31:16\r |
| | 701 | \r |
| | 702 | ; machine check (INT 12h)\r |
| | 703 | MACHINE_CHECK_SEL equ $-IDT_BASE\r |
| | 704 | dw 0 ; offset 15:0\r |
| | 705 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 706 | db 0 ; 0 for interrupt gate\r |
| | 707 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 708 | dw 0 ; offset 31:16\r |
| | 709 | \r |
| | 710 | ; SIMD floating-point exception (INT 13h)\r |
| | 711 | SIMD_EXCEPTION_SEL equ $-IDT_BASE\r |
| | 712 | dw 0 ; offset 15:0\r |
| | 713 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 714 | db 0 ; 0 for interrupt gate\r |
| | 715 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 716 | dw 0 ; offset 31:16\r |
| | 717 | \r |
| | 718 | ; 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r |
| | 719 | db (85 * 8) dup(0)\r |
| | 720 | \r |
| | 721 | ; IRQ 0 (System timer) - (INT 68h)\r |
| | 722 | IRQ0_SEL equ $-IDT_BASE\r |
| | 723 | dw 0 ; offset 15:0\r |
| | 724 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 725 | db 0 ; 0 for interrupt gate\r |
| | 726 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 727 | dw 0 ; offset 31:16\r |
| | 728 | \r |
| | 729 | ; IRQ 1 (8042 Keyboard controller) - (INT 69h)\r |
| | 730 | IRQ1_SEL equ $-IDT_BASE\r |
| | 731 | dw 0 ; offset 15:0\r |
| | 732 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 733 | db 0 ; 0 for interrupt gate\r |
| | 734 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 735 | dw 0 ; offset 31:16\r |
| | 736 | \r |
| | 737 | ; Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r |
| | 738 | IRQ2_SEL equ $-IDT_BASE\r |
| | 739 | dw 0 ; offset 15:0\r |
| | 740 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 741 | db 0 ; 0 for interrupt gate\r |
| | 742 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 743 | dw 0 ; offset 31:16\r |
| | 744 | \r |
| | 745 | ; IRQ 3 (COM 2) - (INT 6bh)\r |
| | 746 | IRQ3_SEL equ $-IDT_BASE\r |
| | 747 | dw 0 ; offset 15:0\r |
| | 748 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 749 | db 0 ; 0 for interrupt gate\r |
| | 750 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 751 | dw 0 ; offset 31:16\r |
| | 752 | \r |
| | 753 | ; IRQ 4 (COM 1) - (INT 6ch)\r |
| | 754 | IRQ4_SEL equ $-IDT_BASE\r |
| | 755 | dw 0 ; offset 15:0\r |
| | 756 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 757 | db 0 ; 0 for interrupt gate\r |
| | 758 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 759 | dw 0 ; offset 31:16\r |
| | 760 | \r |
| | 761 | ; IRQ 5 (LPT 2) - (INT 6dh)\r |
| | 762 | IRQ5_SEL equ $-IDT_BASE\r |
| | 763 | dw 0 ; offset 15:0\r |
| | 764 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 765 | db 0 ; 0 for interrupt gate\r |
| | 766 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 767 | dw 0 ; offset 31:16\r |
| | 768 | \r |
| | 769 | ; IRQ 6 (Floppy controller) - (INT 6eh)\r |
| | 770 | IRQ6_SEL equ $-IDT_BASE\r |
| | 771 | dw 0 ; offset 15:0\r |
| | 772 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 773 | db 0 ; 0 for interrupt gate\r |
| | 774 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 775 | dw 0 ; offset 31:16\r |
| | 776 | \r |
| | 777 | ; IRQ 7 (LPT 1) - (INT 6fh)\r |
| | 778 | IRQ7_SEL equ $-IDT_BASE\r |
| | 779 | dw 0 ; offset 15:0\r |
| | 780 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 781 | db 0 ; 0 for interrupt gate\r |
| | 782 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 783 | dw 0 ; offset 31:16\r |
| | 784 | \r |
| | 785 | ; IRQ 8 (RTC Alarm) - (INT 70h)\r |
| | 786 | IRQ8_SEL equ $-IDT_BASE\r |
| | 787 | dw 0 ; offset 15:0\r |
| | 788 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 789 | db 0 ; 0 for interrupt gate\r |
| | 790 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 791 | dw 0 ; offset 31:16\r |
| | 792 | \r |
| | 793 | ; IRQ 9 - (INT 71h)\r |
| | 794 | IRQ9_SEL equ $-IDT_BASE\r |
| | 795 | dw 0 ; offset 15:0\r |
| | 796 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 797 | db 0 ; 0 for interrupt gate\r |
| | 798 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 799 | dw 0 ; offset 31:16\r |
| | 800 | \r |
| | 801 | ; IRQ 10 - (INT 72h)\r |
| | 802 | IRQ10_SEL equ $-IDT_BASE\r |
| | 803 | dw 0 ; offset 15:0\r |
| | 804 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 805 | db 0 ; 0 for interrupt gate\r |
| | 806 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 807 | dw 0 ; offset 31:16\r |
| | 808 | \r |
| | 809 | ; IRQ 11 - (INT 73h)\r |
| | 810 | IRQ11_SEL equ $-IDT_BASE\r |
| | 811 | dw 0 ; offset 15:0\r |
| | 812 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 813 | db 0 ; 0 for interrupt gate\r |
| | 814 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 815 | dw 0 ; offset 31:16\r |
| | 816 | \r |
| | 817 | ; IRQ 12 (PS/2 mouse) - (INT 74h)\r |
| | 818 | IRQ12_SEL equ $-IDT_BASE\r |
| | 819 | dw 0 ; offset 15:0\r |
| | 820 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 821 | db 0 ; 0 for interrupt gate\r |
| | 822 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 823 | dw 0 ; offset 31:16\r |
| | 824 | \r |
| | 825 | ; IRQ 13 (Floating point error) - (INT 75h)\r |
| | 826 | IRQ13_SEL equ $-IDT_BASE\r |
| | 827 | dw 0 ; offset 15:0\r |
| | 828 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 829 | db 0 ; 0 for interrupt gate\r |
| | 830 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 831 | dw 0 ; offset 31:16\r |
| | 832 | \r |
| | 833 | ; IRQ 14 (Secondary IDE) - (INT 76h)\r |
| | 834 | IRQ14_SEL equ $-IDT_BASE\r |
| | 835 | dw 0 ; offset 15:0\r |
| | 836 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 837 | db 0 ; 0 for interrupt gate\r |
| | 838 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 839 | dw 0 ; offset 31:16\r |
| | 840 | \r |
| | 841 | ; IRQ 15 (Primary IDE) - (INT 77h)\r |
| | 842 | IRQ15_SEL equ $-IDT_BASE\r |
| | 843 | dw 0 ; offset 15:0\r |
| | 844 | dw SYS_CODE_SEL ; selector 15:0\r |
| | 845 | db 0 ; 0 for interrupt gate\r |
| | 846 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r |
| | 847 | dw 0 ; offset 31:16\r |
| | 848 | \r |
| | 849 | IDT_END:\r |
| | 850 | \r |
| | 851 | align 02h\r |
| | 852 | \r |
| | 853 | MemoryMapSize dd 0\r |
| | 854 | MemoryMap 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 | dd 0,0,0,0,0,0,0,0\r |
| | 870 | dd 0,0,0,0,0,0,0,0\r |
| | 871 | dd 0,0,0,0,0,0,0,0\r |
| | 872 | dd 0,0,0,0,0,0,0,0\r |
| | 873 | dd 0,0,0,0,0,0,0,0\r |
| | 874 | dd 0,0,0,0,0,0,0,0\r |
| | 875 | dd 0,0,0,0,0,0,0,0\r |
| | 876 | dd 0,0,0,0,0,0,0,0\r |
| | 877 | dd 0,0,0,0,0,0,0,0\r |
| | 878 | dd 0,0,0,0,0,0,0,0\r |
| | 879 | dd 0,0,0,0,0,0,0,0\r |
| | 880 | dd 0,0,0,0,0,0,0,0\r |
| | 881 | dd 0,0,0,0,0,0,0,0\r |
| | 882 | dd 0,0,0,0,0,0,0,0\r |
| | 883 | dd 0,0,0,0,0,0,0,0\r |
| | 884 | \r |
| | 885 | 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 |
| | 886 | 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 |
| | 887 | \r |
| | 888 | org 0fe0h\r |
| | 889 | MyStack: \r |
| | 890 | ; below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r |
| | 891 | ; back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r |
| | 892 | ; known low address (20f00) so it can be set up by PlMapIrqToVect in\r |
| | 893 | ; 8259.c\r |
| | 894 | \r |
| | 895 | int 8\r |
| | 896 | iret\r |
| | 897 | \r |
| | 898 | int 9\r |
| | 899 | iret\r |
| | 900 | \r |
| | 901 | int 10\r |
| | 902 | iret\r |
| | 903 | \r |
| | 904 | int 11\r |
| | 905 | iret\r |
| | 906 | \r |
| | 907 | int 12\r |
| | 908 | iret\r |
| | 909 | \r |
| | 910 | int 13\r |
| | 911 | iret\r |
| | 912 | \r |
| | 913 | int 14\r |
| | 914 | iret\r |
| | 915 | \r |
| | 916 | int 15\r |
| | 917 | iret\r |
| | 918 | \r |
| | 919 | \r |
| | 920 | org 0ffeh\r |
| | 921 | BlockSignature:\r |
| | 922 | dw 0aa55h\r |
| | 923 | \r |
| | 924 | end \r |
projects / mirror_edk2.git / blame_incremental