| 819958c6 |
1 | #------------------------------------------------------------------------------\r |
| 2 | #*\r |
| 3 | #* Copyright 2006 - 2007, Intel Corporation \r |
| 4 | #* All rights reserved. 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 | #* start.S\r |
| 13 | #* \r |
| 14 | #* Abstract:\r |
| 15 | #*\r |
| 16 | #------------------------------------------------------------------------------\r |
| 17 | \r |
| 18 | \r |
| 19 | .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020\r |
| 20 | .equ FAT_DIRECTORY_ENTRY_SHIFT, 5\r |
| 21 | .equ BLOCK_SIZE, 0x0200\r |
| 22 | .equ BLOCK_MASK, 0x01ff\r |
| 23 | .equ BLOCK_SHIFT, 9\r |
| 24 | \r |
| 25 | .org 0x0\r |
| 26 | Ia32Jump: \r |
| 27 | jmp BootSectorEntryPoint # JMP inst - 3 bytes\r |
| 28 | nop\r |
| 29 | \r |
| 30 | OemId: .ascii "INTEL " # OemId - 8 bytes\r |
| 31 | \r |
| 32 | SectorSize: .word 0 # Sector Size - 16 bits\r |
| 33 | SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits\r |
| 34 | ReservedSectors: .word 0 # Reserved Sectors - 16 bits\r |
| 35 | NoFats: .byte 0 # Number of FATs - 8 bits\r |
| 36 | RootEntries: .word 0 # Root Entries - 16 bits\r |
| 37 | Sectors: .word 0 # Number of Sectors - 16 bits\r |
| 38 | Media: .byte 0 # Media - 8 bits - ignored\r |
| 39 | SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits\r |
| 40 | SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored\r |
| 41 | Heads: .word 0 # Heads - 16 bits - ignored\r |
| 42 | HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored\r |
| 43 | LargeSectors: .long 0 # Large Sectors - 32 bits \r |
| 44 | PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored\r |
| 45 | CurrentHead: .byte 0 # Current Head - 8 bits\r |
| 46 | Signature: .byte 0 # Signature - 8 bits - ignored\r |
| 47 | VolId: .ascii " " # Volume Serial Number- 4 bytes\r |
| 48 | FatLabel: .ascii " " # Label - 11 bytes\r |
| 49 | SystemId: .ascii "FAT12 " # SystemId - 8 bytes\r |
| 50 | \r |
| 51 | BootSectorEntryPoint: \r |
| 52 | #ASSUME ds:@code\r |
| 53 | #ASSUME ss:@code\r |
| 54 | # ds = 1000, es = 2000 + x (size of first cluster >> 4)\r |
| 55 | # cx = Start Cluster of EfiLdr\r |
| 56 | # dx = Start Cluster of Efivar.bin\r |
| 57 | \r |
| 58 | # Re use the BPB data stored in Boot Sector\r |
| 59 | movw $0x7c00, %bp\r |
| 60 | \r |
| 61 | pushw %cx\r |
| 62 | # Read Efivar.bin\r |
| 63 | # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r |
| 64 | movw $0x1900, %ax\r |
| 65 | movw %ax, %es\r |
| 66 | testw %dx, %dx\r |
| 67 | jnz CheckVarStoreSize\r |
| 68 | \r |
| 69 | movb $1, %al\r |
| 70 | NoVarStore: \r |
| 71 | pushw %es\r |
| 72 | # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r |
| 73 | movb %al, %es:($4)\r |
| 74 | jmp SaveVolumeId\r |
| 75 | \r |
| 76 | CheckVarStoreSize: \r |
| 77 | movw %dx, %di\r |
| 78 | cmpl $0x4000, %ds:2(%di)\r |
| 79 | movb $2, %al\r |
| 80 | jne NoVarStore\r |
| 81 | \r |
| 82 | LoadVarStore: \r |
| 83 | movb $0, %al\r |
| 84 | movb %al, %es:($4)\r |
| 85 | movw (%di), %cx\r |
| 86 | # ES:DI = 1500:0\r |
| 87 | xorw %di, %di\r |
| 88 | pushw %es\r |
| 89 | movw $0x1500, %ax\r |
| 90 | movw %ax, %es\r |
| 91 | call ReadFile\r |
| 92 | SaveVolumeId: \r |
| 93 | popw %es\r |
| 94 | movw VolId(%bp), %ax\r |
| 95 | movw %ax, %es:($0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r |
| 96 | movw VolId+2(%bp), %ax\r |
| 97 | movw %ax, %es:($2)\r |
| 98 | \r |
| 99 | # Read Efildr\r |
| 100 | popw %cx\r |
| 101 | # cx = Start Cluster of Efildr -> BS.com has filled already\r |
| 102 | # ES:DI = 2000:0, first cluster will be read again\r |
| 103 | xorw %di, %di # di = 0\r |
| 104 | movw $0x2000, %ax\r |
| 105 | movw %ax, %es\r |
| 106 | call ReadFile\r |
| 107 | movw %cs, %ax\r |
| 108 | movw %ax, %cs:JumpSegment\r |
| 109 | \r |
| 110 | JumpFarInstruction: \r |
| 111 | .byte 0xea\r |
| 112 | JumpOffset: \r |
| 113 | .word 0x200\r |
| 114 | JumpSegment: \r |
| 115 | .word 0x2000\r |
| 116 | \r |
| 117 | \r |
| 118 | \r |
| 119 | # ****************************************************************************\r |
| 120 | # ReadFile\r |
| 121 | #\r |
| 122 | # Arguments:\r |
| 123 | # CX = Start Cluster of File\r |
| 124 | # ES:DI = Buffer to store file content read from disk\r |
| 125 | #\r |
| 126 | # Return:\r |
| 127 | # (ES << 4 + DI) = end of file content Buffer\r |
| 128 | #\r |
| 129 | # ****************************************************************************\r |
| 130 | ReadFile: \r |
| 131 | # si = NumberOfClusters\r |
| 132 | # cx = ClusterNumber\r |
| 133 | # dx = CachedFatSectorNumber\r |
| 134 | # ds:0000 = CacheFatSectorBuffer\r |
| 135 | # es:di = Buffer to load file\r |
| 136 | # bx = NextClusterNumber\r |
| 137 | pusha\r |
| 138 | movw $1, %si # NumberOfClusters = 1\r |
| 139 | pushw %cx # Push Start Cluster onto stack\r |
| 140 | movw $0xfff, %dx # CachedFatSectorNumber = 0xfff\r |
| 141 | FatChainLoop: \r |
| 142 | movw %cx, %ax # ax = ClusterNumber \r |
| 143 | andw $0xff8, %ax # ax = ax & 0xff8\r |
| 144 | cmpw $0xff8, %ax # See if this is the last cluster\r |
| 145 | je FoundLastCluster # Jump if last cluster found\r |
| 146 | movw %cx, %ax # ax = ClusterNumber\r |
| 147 | shlw %ax # ax = ClusterNumber * 2\r |
| 148 | addw %cx, %ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3\r |
| 149 | shrw %ax # FatOffset = ClusterNumber*3 / 2\r |
| 150 | pushw %si # Save si\r |
| 151 | movw %ax, %si # si = FatOffset\r |
| 152 | shrw %ax # ax = FatOffset >> BLOCK_SHIFT\r |
| 153 | addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r |
| 154 | andw BLOCK_MASK,%si # si = FatOffset & BLOCK_MASK\r |
| 155 | cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber\r |
| 156 | je SkipFatRead\r |
| 157 | movw $2, %bx\r |
| 158 | pushw %es\r |
| 159 | pushw %ds\r |
| 160 | popw %es\r |
| 161 | call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI\r |
| 162 | popw %es\r |
| 163 | movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber\r |
| 164 | SkipFatRead: \r |
| 165 | movw (%si), %bx # bx = NextClusterNumber\r |
| 166 | movw %cx, %ax # ax = ClusterNumber\r |
| 167 | andw $1, %ax # See if this is an odd cluster number\r |
| 168 | je EvenFatEntry\r |
| 169 | shrw $4, %bx # NextClusterNumber = NextClusterNumber >> 4\r |
| 170 | EvenFatEntry: \r |
| 171 | andw $0xfff, %bx # Strip upper 4 bits of NextClusterNumber\r |
| 172 | popw %si # Restore si\r |
| 173 | decw %bx # bx = NextClusterNumber - 1\r |
| 174 | cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber\r |
| 175 | jne ReadClusters\r |
| 176 | incw %bx # bx = NextClusterNumber\r |
| 177 | incw %si # NumberOfClusters++\r |
| 178 | movw %bx, %cx # ClusterNumber = NextClusterNumber\r |
| 179 | jmp FatChainLoop\r |
| 180 | ReadClusters: \r |
| 181 | incw %bx\r |
| 182 | popw %ax # ax = StartCluster\r |
| 183 | pushw %bx # StartCluster = NextClusterNumber\r |
| 184 | movw %bx, %cx # ClusterNumber = NextClusterNumber\r |
| 185 | subw $2, %ax # ax = StartCluster - 2\r |
| 186 | xorb %bh, %bh\r |
| 187 | movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r |
| 188 | mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster\r |
| 189 | addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r |
| 190 | pushw %ax # save start sector\r |
| 191 | movw %si, %ax # ax = NumberOfClusters\r |
| 192 | mulw %bx # ax = NumberOfClusters * SectorsPerCluster\r |
| 193 | movw %ax, %bx # bx = Number of Sectors\r |
| 194 | popw %ax # ax = Start Sector\r |
| 195 | call ReadBlocks\r |
| 196 | movw $1, %si # NumberOfClusters = 1\r |
| 197 | jmp FatChainLoop\r |
| 198 | FoundLastCluster: \r |
| 199 | popw %cx\r |
| 200 | popa\r |
| 201 | ret\r |
| 202 | \r |
| 203 | \r |
| 204 | # ****************************************************************************\r |
| 205 | # ReadBlocks - Reads a set of blocks from a block device\r |
| 206 | #\r |
| 207 | # AX = Start LBA\r |
| 208 | # BX = Number of Blocks to Read\r |
| 209 | # ES:DI = Buffer to store sectors read from disk\r |
| 210 | # ****************************************************************************\r |
| 211 | \r |
| 212 | # cx = Blocks\r |
| 213 | # bx = NumberOfBlocks\r |
| 214 | # si = StartLBA\r |
| 215 | \r |
| 216 | ReadBlocks: \r |
| 217 | pusha\r |
| 218 | addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA\r |
| 219 | addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA\r |
| 220 | movl %eax, %esi # esi = Start LBA\r |
| 221 | movw %bx, %cx # cx = Number of blocks to read\r |
| 222 | ReadCylinderLoop: \r |
| 223 | movw $0x7bfc, %bp # bp = 0x7bfc\r |
| 224 | movl %esi, %eax # eax = Start LBA\r |
| 225 | xorl %edx, %edx # edx = 0\r |
| 226 | movzwl (%bp), %ebx # bx = MaxSector\r |
| 227 | divl %ebx # ax = StartLBA / MaxSector\r |
| 228 | incw %dx # dx = (StartLBA % MaxSector) + 1\r |
| 229 | \r |
| 230 | movw (%bp), %bx # bx = MaxSector\r |
| 231 | subw %dx, %bx # bx = MaxSector - Sector\r |
| 232 | incw %bx # bx = MaxSector - Sector + 1\r |
| 233 | cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1)\r |
| 234 | jg LimitTransfer\r |
| 235 | movw %cx, %bx # bx = Blocks\r |
| 236 | LimitTransfer: \r |
| 237 | pushw %ax # save ax\r |
| 238 | movw %es, %ax # ax = es\r |
| 239 | shrw %ax # ax = Number of blocks into mem system\r |
| 240 | andw $0x7f, %ax # ax = Number of blocks into current seg\r |
| 241 | addw %bx, %ax # ax = End Block number of transfer\r |
| 242 | cmpw $0x80, %ax # See if it crosses a 64K boundry\r |
| 243 | jle NotCrossing64KBoundry # Branch if not crossing 64K boundry\r |
| 244 | subw $0x80, %ax # ax = Number of blocks past 64K boundry\r |
| 245 | subw %ax, %bx # Decrease transfer size by block overage\r |
| 246 | NotCrossing64KBoundry: \r |
| 247 | popw %ax # restore ax\r |
| 248 | \r |
| 249 | pushw %cx\r |
| 250 | movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector\r |
| 251 | xorw %dx, %dx # dx = 0\r |
| 252 | divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder \r |
| 253 | # dx = ax % (MaxHead + 1) = Head\r |
| 254 | \r |
| 255 | pushw %bx # Save number of blocks to transfer\r |
| 256 | movb %dl, %dh # dh = Head\r |
| 257 | movw $0x7c00, %bp # bp = 0x7c00\r |
| 258 | movb PhysicalDrive(%bp), %dl # dl = Drive Number\r |
| 259 | movb %al, %ch # ch = Cylinder\r |
| 260 | movb %bl, %al # al = Blocks\r |
| 261 | movb $2, %ah # ah = Function 2\r |
| 262 | movw %di, %bx # es:bx = Buffer address\r |
| 263 | int $0x13\r |
| 264 | jc DiskError\r |
| 265 | popw %bx\r |
| 266 | popw %cx\r |
| 267 | movzwl %bx, %ebx\r |
| 268 | addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks\r |
| 269 | subw %bx, %cx # Blocks = Blocks - NumberOfBlocks\r |
| 270 | movw %es, %ax\r |
| 271 | shlw %bx\r |
| 272 | addw %bx, %ax\r |
| 273 | movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r |
| 274 | cmpw $0, %cx\r |
| 275 | jne ReadCylinderLoop\r |
| 276 | popa\r |
| 277 | ret\r |
| 278 | \r |
| 279 | DiskError: \r |
| 280 | pushw %cs\r |
| 281 | popw %ds\r |
| 282 | leaw %cs:ErrorString, %si\r |
| 283 | movw $7, %cx\r |
| 284 | jmp PrintStringAndHalt\r |
| 285 | \r |
| 286 | PrintStringAndHalt: \r |
| 287 | movw $0xb800, %ax\r |
| 288 | movw %ax, %es\r |
| 289 | movw $160, %di\r |
| 290 | rep\r |
| 291 | movsw\r |
| 292 | Halt: \r |
| 293 | jmp Halt\r |
| 294 | \r |
| 295 | ErrorString: \r |
| 296 | .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c\r |
| 297 | \r |
| 298 | #.org 0x0242 # For Code size overflow, Modified this just for pass build\r |
| 299 | LBAOffsetForBootSector: \r |
| 300 | .long 0x0\r |
| 301 | \r |
| 302 | #.org 0x0227 # For Code size overflow, Modified this just for pass build\r |
| 303 | .word 0xaa55\r |
| 304 | \r |
| 305 | #******************************************************************************\r |
| 306 | #******************************************************************************\r |
| 307 | #******************************************************************************\r |
| 308 | \r |
| 309 | .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay\r |
| 310 | .equ KBD_CONTROL_PORT, 0x060 # 8042 control port \r |
| 311 | .equ KBD_STATUS_PORT, 0x064 # 8042 status port \r |
| 312 | .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port\r |
| 313 | .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20\r |
| 314 | \r |
| 315 | #.org 0x200\r |
| 316 | jmp start\r |
| 317 | Em64String: \r |
| 318 | .byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c\r |
| 319 | \r |
| 320 | start: \r |
| 321 | movw %cs, %ax\r |
| 322 | movw %ax, %ds\r |
| 323 | movw %ax, %es\r |
| 324 | movw %ax, %ss\r |
| 325 | movw $MyStack, %sp\r |
| 326 | \r |
| 327 | # mov ax,0b800h\r |
| 328 | # mov es,ax\r |
| 329 | # mov byte ptr es:[160],'a'\r |
| 330 | # mov ax,cs\r |
| 331 | # mov es,ax\r |
| 332 | \r |
| 333 | movl $0, %ebx\r |
| 334 | leal MemoryMap, %edi\r |
| 335 | MemMapLoop: \r |
| 336 | movl $0xe820, %eax\r |
| 337 | movl $20, %ecx\r |
| 9ffd16fb |
338 | movl $0x534d4150, %edx # SMAP\r |
| 819958c6 |
339 | int $0x15\r |
| 340 | jc MemMapDone\r |
| 341 | addl $20, %edi\r |
| 342 | cmpl $0, %ebx\r |
| 343 | je MemMapDone\r |
| 344 | jmp MemMapLoop\r |
| 345 | MemMapDone: \r |
| 346 | leal MemoryMap, %eax\r |
| 347 | subl %eax, %edi # Get the address of the memory map\r |
| 348 | movl %edi, MemoryMapSize # Save the size of the memory map\r |
| 349 | \r |
| 350 | xorl %ebx, %ebx\r |
| 351 | movw %cs, %bx # BX=segment\r |
| 352 | shll $4, %ebx # BX="linear" address of segment base\r |
| 353 | leal GDT_BASE(%ebx), %eax #\r |
| 354 | movl %eax, (gdtr + 2) #\r |
| 355 | leal IDT_BASE(%ebx), %eax #\r |
| 356 | movl %eax, (idtr + 2) #\r |
| 357 | leal MemoryMapSize(%ebx), %edx #\r |
| 358 | \r |
| 359 | addl $0x1000, %ebx # Source of EFI32\r |
| 360 | movl %ebx, JUMP+2\r |
| 361 | addl $0x1000, %ebx\r |
| 362 | movl %ebx, %esi # Source of EFILDR32\r |
| 363 | \r |
| 364 | # mov ax,0b800h\r |
| 365 | # mov es,ax\r |
| 366 | # mov byte ptr es:[162],'b'\r |
| 367 | # mov ax,cs\r |
| 368 | # mov es,ax\r |
| 369 | \r |
| 370 | #\r |
| 371 | # Enable A20 Gate \r |
| 372 | #\r |
| 373 | \r |
| 374 | movw $0x2401, %ax # Enable A20 Gate\r |
| 375 | int $0x15\r |
| 376 | jnc A20GateEnabled # Jump if it suceeded\r |
| 377 | \r |
| 378 | #\r |
| 379 | # If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r |
| 380 | #\r |
| 381 | \r |
| 382 | call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r |
| 383 | jnz Timeout8042 # Jump if the 8042 timed out\r |
| 384 | outw %ax, $DELAY_PORT # Delay 1 uS\r |
| 385 | mov $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r |
| 386 | out %al, $KBD_STATUS_PORT # Send command to the 8042\r |
| 387 | call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r |
| 388 | jnz Timeout8042 # Jump if the 8042 timed out\r |
| 389 | mov $ENABLE_A20_CMD, %al # gate address bit 20 on\r |
| 390 | out %al, $KBD_CONTROL_PORT # Send command to thre 8042\r |
| 391 | call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r |
| 392 | movw $25, %cx # Delay 25 uS for the command to complete on the 8042\r |
| 393 | Delay25uS: \r |
| 394 | outw %ax, $DELAY_PORT # Delay 1 uS\r |
| 395 | loop Delay25uS\r |
| 396 | Timeout8042: \r |
| 397 | \r |
| 398 | \r |
| 399 | A20GateEnabled: \r |
| 400 | \r |
| 401 | #\r |
| 402 | # DISABLE INTERRUPTS - Entering Protected Mode\r |
| 403 | #\r |
| 404 | \r |
| 405 | cli\r |
| 406 | \r |
| 407 | # mov ax,0b800h\r |
| 408 | # mov es,ax\r |
| 409 | # mov byte ptr es:[164],'c'\r |
| 410 | # mov ax,cs\r |
| 411 | # mov es,ax\r |
| 412 | \r |
| 413 | .byte 0x66\r |
| 414 | lgdt gdtr\r |
| 415 | .byte 0x66\r |
| 416 | lidt idtr\r |
| 417 | \r |
| 418 | movl %cr0, %eax\r |
| 419 | orb $1, %al\r |
| 420 | movl %eax, %cr0\r |
| 421 | \r |
| 422 | movl $0x008, %eax # Flat data descriptor\r |
| 423 | movl $0x00400000, %ebp # Destination of EFILDR32\r |
| 424 | movl $0x00070000, %ebx # Length of copy\r |
| 425 | \r |
| 426 | JUMP: \r |
| 427 | # jmp far 0010:00020000\r |
| 428 | .byte 0x66\r |
| 429 | .byte 0xea\r |
| 430 | .long 0x00020000\r |
| 431 | .word 0x0010\r |
| 432 | \r |
| 433 | Empty8042InputBuffer: \r |
| 434 | movw $0, %cx\r |
| 435 | Empty8042Loop: \r |
| 436 | outw %ax, $DELAY_PORT # Delay 1us\r |
| 437 | in $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r |
| 438 | andb $0x2, %al # Check the Input Buffer Full Flag\r |
| 439 | loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r |
| 440 | ret\r |
| 441 | \r |
| 442 | ##############################################################################\r |
| 443 | # data\r |
| 444 | ##############################################################################\r |
| 445 | \r |
| 446 | .align 0x2\r |
| 447 | \r |
| 448 | gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r |
| 449 | .long 0 # (GDT base gets set above)\r |
| 450 | ##############################################################################\r |
| 451 | # global descriptor table (GDT)\r |
| 452 | ##############################################################################\r |
| 453 | \r |
| 454 | .align 0x2\r |
| 455 | \r |
| 456 | GDT_BASE: \r |
| 457 | # null descriptor\r |
| 458 | .equ NULL_SEL, .-GDT_BASE\r |
| 459 | .word 0 # limit 15:0\r |
| 460 | .word 0 # base 15:0\r |
| 461 | .byte 0 # base 23:16\r |
| 462 | .byte 0 # type\r |
| 463 | .byte 0 # limit 19:16, flags\r |
| 464 | .byte 0 # base 31:24\r |
| 465 | \r |
| 466 | # linear data segment descriptor\r |
| 467 | .equ LINEAR_SEL, .-GDT_BASE\r |
| 468 | .word 0xFFFF # limit 0xFFFFF\r |
| 469 | .word 0 # base 0\r |
| 470 | .byte 0\r |
| 471 | .byte 0x92 # present, ring 0, data, expand-up, writable\r |
| 472 | .byte 0xCF # page-granular, 32-bit\r |
| 473 | .byte 0\r |
| 474 | \r |
| 475 | # linear code segment descriptor\r |
| 476 | .equ LINEAR_CODE_SEL, .-GDT_BASE\r |
| 477 | .word 0xFFFF # limit 0xFFFFF\r |
| 478 | .word 0 # base 0\r |
| 479 | .byte 0\r |
| 480 | .byte 0x9A # present, ring 0, data, expand-up, writable\r |
| 481 | .byte 0xCF # page-granular, 32-bit\r |
| 482 | .byte 0\r |
| 483 | \r |
| 484 | # system data segment descriptor\r |
| 485 | .equ SYS_DATA_SEL, .-GDT_BASE\r |
| 486 | .word 0xFFFF # limit 0xFFFFF\r |
| 487 | .word 0 # base 0\r |
| 488 | .byte 0\r |
| 489 | .byte 0x92 # present, ring 0, data, expand-up, writable\r |
| 490 | .byte 0xCF # page-granular, 32-bit\r |
| 491 | .byte 0\r |
| 492 | \r |
| 493 | # system code segment descriptor\r |
| 494 | .equ SYS_CODE_SEL, .-GDT_BASE\r |
| 495 | .word 0xFFFF # limit 0xFFFFF\r |
| 496 | .word 0 # base 0\r |
| 497 | .byte 0\r |
| 498 | .byte 0x9A # present, ring 0, data, expand-up, writable\r |
| 499 | .byte 0xCF # page-granular, 32-bit\r |
| 500 | .byte 0\r |
| 501 | \r |
| 502 | # spare segment descriptor\r |
| 503 | .equ SPARE3_SEL, .-GDT_BASE\r |
| 504 | .word 0 # limit 0xFFFFF\r |
| 505 | .word 0 # base 0\r |
| 506 | .byte 0\r |
| 507 | .byte 0 # present, ring 0, data, expand-up, writable\r |
| 508 | .byte 0 # page-granular, 32-bit\r |
| 509 | .byte 0\r |
| 510 | \r |
| 511 | # spare segment descriptor\r |
| 512 | .equ SPARE4_SEL, .-GDT_BASE\r |
| 513 | .word 0 # limit 0xFFFFF\r |
| 514 | .word 0 # base 0\r |
| 515 | .byte 0\r |
| 516 | .byte 0 # present, ring 0, data, expand-up, writable\r |
| 517 | .byte 0 # page-granular, 32-bit\r |
| 518 | .byte 0\r |
| 519 | \r |
| 520 | # spare segment descriptor\r |
| 521 | .equ SPARE5_SEL, .-GDT_BASE\r |
| 522 | .word 0 # limit 0xFFFFF\r |
| 523 | .word 0 # base 0\r |
| 524 | .byte 0\r |
| 525 | .byte 0 # present, ring 0, data, expand-up, writable\r |
| 526 | .byte 0 # page-granular, 32-bit\r |
| 527 | .byte 0\r |
| 528 | \r |
| 529 | GDT_END: \r |
| 530 | \r |
| 531 | .align 0x2\r |
| 532 | \r |
| 533 | \r |
| 534 | \r |
| 535 | idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r |
| 536 | .long 0 # (IDT base gets set above)\r |
| 537 | ##############################################################################\r |
| 538 | # interrupt descriptor table (IDT)\r |
| 539 | #\r |
| 540 | # Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r |
| 541 | # mappings. This implementation only uses the system timer and all other\r |
| 542 | # IRQs will remain masked. The descriptors for vectors 33+ are provided\r |
| 543 | # for convenience.\r |
| 544 | ##############################################################################\r |
| 545 | \r |
| 546 | #idt_tag db "IDT",0 \r |
| 547 | .align 0x2\r |
| 548 | \r |
| 549 | IDT_BASE: \r |
| 550 | # divide by zero (INT 0)\r |
| 551 | .equ DIV_ZERO_SEL, .-IDT_BASE\r |
| 552 | .word 0 # offset 15:0\r |
| 553 | .long SYS_CODE_SEL # selector 15:0\r |
| 554 | .byte 0 # 0 for interrupt gate\r |
| 555 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 556 | .word 0 # offset 31:16\r |
| 557 | \r |
| 558 | # debug exception (INT 1)\r |
| 559 | .equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r |
| 560 | .word 0 # offset 15:0\r |
| 561 | .long SYS_CODE_SEL # selector 15:0\r |
| 562 | .byte 0 # 0 for interrupt gate\r |
| 563 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 564 | .word 0 # offset 31:16\r |
| 565 | \r |
| 566 | # NMI (INT 2)\r |
| 567 | .equ NMI_SEL, .-IDT_BASE\r |
| 568 | .word 0 # offset 15:0\r |
| 569 | .long SYS_CODE_SEL # selector 15:0\r |
| 570 | .byte 0 # 0 for interrupt gate\r |
| 571 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 572 | .word 0 # offset 31:16\r |
| 573 | \r |
| 574 | # soft breakpoint (INT 3)\r |
| 575 | .equ BREAKPOINT_SEL, .-IDT_BASE\r |
| 576 | .word 0 # offset 15:0\r |
| 577 | .long SYS_CODE_SEL # selector 15:0\r |
| 578 | .byte 0 # 0 for interrupt gate\r |
| 579 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 580 | .word 0 # offset 31:16\r |
| 581 | \r |
| 582 | # overflow (INT 4)\r |
| 583 | .equ OVERFLOW_SEL, .-IDT_BASE\r |
| 584 | .word 0 # offset 15:0\r |
| 585 | .long SYS_CODE_SEL # selector 15:0\r |
| 586 | .byte 0 # 0 for interrupt gate\r |
| 587 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 588 | .word 0 # offset 31:16\r |
| 589 | \r |
| 590 | # bounds check (INT 5)\r |
| 591 | .equ BOUNDS_CHECK_SEL, .-IDT_BASE\r |
| 592 | .word 0 # offset 15:0\r |
| 593 | .long SYS_CODE_SEL # selector 15:0\r |
| 594 | .byte 0 # 0 for interrupt gate\r |
| 595 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 596 | .word 0 # offset 31:16\r |
| 597 | \r |
| 598 | # invalid opcode (INT 6)\r |
| 599 | .equ INVALID_OPCODE_SEL, .-IDT_BASE\r |
| 600 | .word 0 # offset 15:0\r |
| 601 | .long SYS_CODE_SEL # selector 15:0\r |
| 602 | .byte 0 # 0 for interrupt gate\r |
| 603 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 604 | .word 0 # offset 31:16\r |
| 605 | \r |
| 606 | # device not available (INT 7)\r |
| 607 | .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r |
| 608 | .word 0 # offset 15:0\r |
| 609 | .long SYS_CODE_SEL # selector 15:0\r |
| 610 | .byte 0 # 0 for interrupt gate\r |
| 611 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 612 | .word 0 # offset 31:16\r |
| 613 | \r |
| 614 | # double fault (INT 8)\r |
| 615 | .equ DOUBLE_FAULT_SEL, .-IDT_BASE\r |
| 616 | .word 0 # offset 15:0\r |
| 617 | .long SYS_CODE_SEL # selector 15:0\r |
| 618 | .byte 0 # 0 for interrupt gate\r |
| 619 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 620 | .word 0 # offset 31:16\r |
| 621 | \r |
| 622 | # Coprocessor segment overrun - reserved (INT 9)\r |
| 623 | .equ RSVD_INTR_SEL1, .-IDT_BASE\r |
| 624 | .word 0 # offset 15:0\r |
| 625 | .long SYS_CODE_SEL # selector 15:0\r |
| 626 | .byte 0 # 0 for interrupt gate\r |
| 627 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 628 | .word 0 # offset 31:16\r |
| 629 | \r |
| 630 | # invalid TSS (INT 0x0a)\r |
| 631 | .equ INVALID_TSS_SEL, .-IDT_BASE\r |
| 632 | .word 0 # offset 15:0\r |
| 633 | .long SYS_CODE_SEL # selector 15:0\r |
| 634 | .byte 0 # 0 for interrupt gate\r |
| 635 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 636 | .word 0 # offset 31:16\r |
| 637 | \r |
| 638 | # segment not present (INT 0x0b)\r |
| 639 | .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r |
| 640 | .word 0 # offset 15:0\r |
| 641 | .long SYS_CODE_SEL # selector 15:0\r |
| 642 | .byte 0 # 0 for interrupt gate\r |
| 643 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 644 | .word 0 # offset 31:16\r |
| 645 | \r |
| 646 | # stack fault (INT 0x0c)\r |
| 647 | .equ STACK_FAULT_SEL, .-IDT_BASE\r |
| 648 | .word 0 # offset 15:0\r |
| 649 | .long SYS_CODE_SEL # selector 15:0\r |
| 650 | .byte 0 # 0 for interrupt gate\r |
| 651 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 652 | .word 0 # offset 31:16\r |
| 653 | \r |
| 654 | # general protection (INT 0x0d)\r |
| 655 | .equ GP_FAULT_SEL, .-IDT_BASE\r |
| 656 | .word 0 # offset 15:0\r |
| 657 | .long SYS_CODE_SEL # selector 15:0\r |
| 658 | .byte 0 # 0 for interrupt gate\r |
| 659 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 660 | .word 0 # offset 31:16\r |
| 661 | \r |
| 662 | # page fault (INT 0x0e)\r |
| 663 | .equ PAGE_FAULT_SEL, .-IDT_BASE\r |
| 664 | .word 0 # offset 15:0\r |
| 665 | .long SYS_CODE_SEL # selector 15:0\r |
| 666 | .byte 0 # 0 for interrupt gate\r |
| 667 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 668 | .word 0 # offset 31:16\r |
| 669 | \r |
| 670 | # Intel reserved - do not use (INT 0x0f)\r |
| 671 | .equ RSVD_INTR_SEL2, .-IDT_BASE\r |
| 672 | .word 0 # offset 15:0\r |
| 673 | .long SYS_CODE_SEL # selector 15:0\r |
| 674 | .byte 0 # 0 for interrupt gate\r |
| 675 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 676 | .word 0 # offset 31:16\r |
| 677 | \r |
| 678 | # floating point error (INT 0x10)\r |
| 679 | .equ FLT_POINT_ERR_SEL, .-IDT_BASE\r |
| 680 | .word 0 # offset 15:0\r |
| 681 | .long SYS_CODE_SEL # selector 15:0\r |
| 682 | .byte 0 # 0 for interrupt gate\r |
| 683 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r |
| 684 | .word 0 # offset 31:16\r |
| 685 | \r |
| 686 | # alignment check (INT 0x11)\r |
| 687 | .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r |
| 688 | .word 0 # offset 15:0\r |
| 689 | .long SYS_CODE_SEL # selector 15:0\r |
| 690 | .byte 0 # 0 for interrupt gate\r |
| 691 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 692 | .word 0 # offset 31:16\r |
| 693 | \r |
| 694 | # machine check (INT 0x12)\r |
| 695 | .equ MACHINE_CHECK_SEL, .-IDT_BASE\r |
| 696 | .word 0 # offset 15:0\r |
| 697 | .long SYS_CODE_SEL # selector 15:0\r |
| 698 | .byte 0 # 0 for interrupt gate\r |
| 699 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 700 | .word 0 # offset 31:16\r |
| 701 | \r |
| 702 | # SIMD floating-point exception (INT 0x13)\r |
| 703 | .equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r |
| 704 | .word 0 # offset 15:0\r |
| 705 | .long SYS_CODE_SEL # selector 15:0\r |
| 706 | .byte 0 # 0 for interrupt gate\r |
| 707 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 708 | .word 0 # offset 31:16\r |
| 709 | \r |
| 710 | # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r |
| 711 | .fill 85 * 8, 1, 0 # db (85 * 8) dup(0)\r |
| 712 | \r |
| 713 | # IRQ 0 (System timer) - (INT 0x68)\r |
| 714 | .equ IRQ0_SEL, .-IDT_BASE\r |
| 715 | .word 0 # offset 15:0\r |
| 716 | .long SYS_CODE_SEL # selector 15:0\r |
| 717 | .byte 0 # 0 for interrupt gate\r |
| 718 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 719 | .word 0 # offset 31:16\r |
| 720 | \r |
| 721 | # IRQ 1 (8042 Keyboard controller) - (INT 0x69)\r |
| 722 | .equ IRQ1_SEL, .-IDT_BASE\r |
| 723 | .word 0 # offset 15:0\r |
| 724 | .long SYS_CODE_SEL # selector 15:0\r |
| 725 | .byte 0 # 0 for interrupt gate\r |
| 726 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 727 | .word 0 # offset 31:16\r |
| 728 | \r |
| 729 | # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 0x6a)\r |
| 730 | .equ IRQ2_SEL, .-IDT_BASE\r |
| 731 | .word 0 # offset 15:0\r |
| 732 | .long SYS_CODE_SEL # selector 15:0\r |
| 733 | .byte 0 # 0 for interrupt gate\r |
| 734 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 735 | .word 0 # offset 31:16\r |
| 736 | \r |
| 737 | # IRQ 3 (COM 2) - (INT 0x6b)\r |
| 738 | .equ IRQ3_SEL, .-IDT_BASE\r |
| 739 | .word 0 # offset 15:0\r |
| 740 | .long SYS_CODE_SEL # selector 15:0\r |
| 741 | .byte 0 # 0 for interrupt gate\r |
| 742 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 743 | .word 0 # offset 31:16\r |
| 744 | \r |
| 745 | # IRQ 4 (COM 1) - (INT 0x6c)\r |
| 746 | .equ IRQ4_SEL, .-IDT_BASE\r |
| 747 | .word 0 # offset 15:0\r |
| 748 | .long SYS_CODE_SEL # selector 15:0\r |
| 749 | .byte 0 # 0 for interrupt gate\r |
| 750 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 751 | .word 0 # offset 31:16\r |
| 752 | \r |
| 753 | # IRQ 5 (LPT 2) - (INT 0x6d)\r |
| 754 | .equ IRQ5_SEL, .-IDT_BASE\r |
| 755 | .word 0 # offset 15:0\r |
| 756 | .long SYS_CODE_SEL # selector 15:0\r |
| 757 | .byte 0 # 0 for interrupt gate\r |
| 758 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 759 | .word 0 # offset 31:16\r |
| 760 | \r |
| 761 | # IRQ 6 (Floppy controller) - (INT 0x6e)\r |
| 762 | .equ IRQ6_SEL, .-IDT_BASE\r |
| 763 | .word 0 # offset 15:0\r |
| 764 | .long SYS_CODE_SEL # selector 15:0\r |
| 765 | .byte 0 # 0 for interrupt gate\r |
| 766 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 767 | .word 0 # offset 31:16\r |
| 768 | \r |
| 769 | # IRQ 7 (LPT 1) - (INT 0x6f)\r |
| 770 | .equ IRQ7_SEL, .-IDT_BASE\r |
| 771 | .word 0 # offset 15:0\r |
| 772 | .long SYS_CODE_SEL # selector 15:0\r |
| 773 | .byte 0 # 0 for interrupt gate\r |
| 774 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 775 | .word 0 # offset 31:16\r |
| 776 | \r |
| 777 | # IRQ 8 (RTC Alarm) - (INT 0x70)\r |
| 778 | .equ IRQ8_SEL, .-IDT_BASE\r |
| 779 | .word 0 # offset 15:0\r |
| 780 | .long SYS_CODE_SEL # selector 15:0\r |
| 781 | .byte 0 # 0 for interrupt gate\r |
| 782 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 783 | .word 0 # offset 31:16\r |
| 784 | \r |
| 785 | # IRQ 9 - (INT 0x71)\r |
| 786 | .equ IRQ9_SEL, .-IDT_BASE\r |
| 787 | .word 0 # offset 15:0\r |
| 788 | .long SYS_CODE_SEL # selector 15:0\r |
| 789 | .byte 0 # 0 for interrupt gate\r |
| 790 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 791 | .word 0 # offset 31:16\r |
| 792 | \r |
| 793 | # IRQ 10 - (INT 0x72)\r |
| 794 | .equ IRQ10_SEL, .-IDT_BASE\r |
| 795 | .word 0 # offset 15:0\r |
| 796 | .long SYS_CODE_SEL # selector 15:0\r |
| 797 | .byte 0 # 0 for interrupt gate\r |
| 798 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 799 | .word 0 # offset 31:16\r |
| 800 | \r |
| 801 | # IRQ 11 - (INT 0x73)\r |
| 802 | .equ IRQ11_SEL, .-IDT_BASE\r |
| 803 | .word 0 # offset 15:0\r |
| 804 | .long SYS_CODE_SEL # selector 15:0\r |
| 805 | .byte 0 # 0 for interrupt gate\r |
| 806 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 807 | .word 0 # offset 31:16\r |
| 808 | \r |
| 809 | # IRQ 12 (PS/2 mouse) - (INT 0x74)\r |
| 810 | .equ IRQ12_SEL, .-IDT_BASE\r |
| 811 | .word 0 # offset 15:0\r |
| 812 | .long SYS_CODE_SEL # selector 15:0\r |
| 813 | .byte 0 # 0 for interrupt gate\r |
| 814 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 815 | .word 0 # offset 31:16\r |
| 816 | \r |
| 817 | # IRQ 13 (Floating point error) - (INT 0x75)\r |
| 818 | .equ IRQ13_SEL, .-IDT_BASE\r |
| 819 | .word 0 # offset 15:0\r |
| 820 | .long SYS_CODE_SEL # selector 15:0\r |
| 821 | .byte 0 # 0 for interrupt gate\r |
| 822 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 823 | .word 0 # offset 31:16\r |
| 824 | \r |
| 825 | # IRQ 14 (Secondary IDE) - (INT 0x76)\r |
| 826 | .equ IRQ14_SEL, .-IDT_BASE\r |
| 827 | .word 0 # offset 15:0\r |
| 828 | .long SYS_CODE_SEL # selector 15:0\r |
| 829 | .byte 0 # 0 for interrupt gate\r |
| 830 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 831 | .word 0 # offset 31:16\r |
| 832 | \r |
| 833 | # IRQ 15 (Primary IDE) - (INT 0x77)\r |
| 834 | .equ IRQ15_SEL, .-IDT_BASE\r |
| 835 | .word 0 # offset 15:0\r |
| 836 | .long SYS_CODE_SEL # selector 15:0\r |
| 837 | .byte 0 # 0 for interrupt gate\r |
| 838 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r |
| 839 | .word 0 # offset 31:16\r |
| 840 | \r |
| 841 | IDT_END: \r |
| 842 | \r |
| 843 | .align 0x2\r |
| 844 | \r |
| 845 | MemoryMapSize: .long 0\r |
| 846 | MemoryMap: .long 0,0,0,0,0,0,0,0\r |
| 847 | .long 0,0,0,0,0,0,0,0\r |
| 848 | .long 0,0,0,0,0,0,0,0\r |
| 849 | .long 0,0,0,0,0,0,0,0\r |
| 850 | .long 0,0,0,0,0,0,0,0\r |
| 851 | .long 0,0,0,0,0,0,0,0\r |
| 852 | .long 0,0,0,0,0,0,0,0\r |
| 853 | .long 0,0,0,0,0,0,0,0\r |
| 854 | .long 0,0,0,0,0,0,0,0\r |
| 855 | .long 0,0,0,0,0,0,0,0\r |
| 856 | .long 0,0,0,0,0,0,0,0\r |
| 857 | .long 0,0,0,0,0,0,0,0\r |
| 858 | .long 0,0,0,0,0,0,0,0\r |
| 859 | .long 0,0,0,0,0,0,0,0\r |
| 860 | .long 0,0,0,0,0,0,0,0\r |
| 861 | .long 0,0,0,0,0,0,0,0\r |
| 862 | .long 0,0,0,0,0,0,0,0\r |
| 863 | .long 0,0,0,0,0,0,0,0\r |
| 864 | .long 0,0,0,0,0,0,0,0\r |
| 865 | .long 0,0,0,0,0,0,0,0\r |
| 866 | .long 0,0,0,0,0,0,0,0\r |
| 867 | .long 0,0,0,0,0,0,0,0\r |
| 868 | .long 0,0,0,0,0,0,0,0\r |
| 869 | .long 0,0,0,0,0,0,0,0\r |
| 870 | .long 0,0,0,0,0,0,0,0\r |
| 871 | .long 0,0,0,0,0,0,0,0\r |
| 872 | .long 0,0,0,0,0,0,0,0\r |
| 873 | .long 0,0,0,0,0,0,0,0\r |
| 874 | .long 0,0,0,0,0,0,0,0\r |
| 875 | .long 0,0,0,0,0,0,0,0\r |
| 876 | \r |
| 877 | .long 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 |
| 878 | .long 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 |
| 879 | \r |
| 880 | .org 0x0fe0\r |
| 881 | MyStack: \r |
| 882 | # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r |
| 883 | # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r |
| 884 | # known low address (20f00) so it can be set up by PlMapIrqToVect in\r |
| 885 | # 8259.c\r |
| 886 | \r |
| 887 | int $8\r |
| 888 | iret\r |
| 889 | \r |
| 890 | int $9\r |
| 891 | iret\r |
| 892 | \r |
| 893 | int $10\r |
| 894 | iret\r |
| 895 | \r |
| 896 | int $11\r |
| 897 | iret\r |
| 898 | \r |
| 899 | int $12\r |
| 900 | iret\r |
| 901 | \r |
| 902 | int $13\r |
| 903 | iret\r |
| 904 | \r |
| 905 | int $14\r |
| 906 | iret\r |
| 907 | \r |
| 908 | int $15\r |
| 909 | iret\r |
| 910 | \r |
| 911 | \r |
| 912 | .org 0x0ffe\r |
| 913 | BlockSignature: \r |
| 914 | .word 0xaa55\r |
| 915 | \r |
| 916 | \r |
projects / mirror_edk2.git / blame