projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 819958c6 | 1 | #------------------------------------------------------------------------------\r |
| 2 | #*\r | |
| b1f700a8 HT |
3 | #* Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>\r |
| 4 | #* This program and the accompanying materials \r | |
| 819958c6 | 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 | |
| 88e9055e | 18 | .stack: \r |
| 19 | .486p: \r | |
| 20 | .code16\r | |
| b29a823d | 21 | \r |
| 819958c6 | 22 | .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020\r |
| 23 | .equ FAT_DIRECTORY_ENTRY_SHIFT, 5\r | |
| 24 | .equ BLOCK_SIZE, 0x0200\r | |
| 25 | .equ BLOCK_MASK, 0x01ff\r | |
| 26 | .equ BLOCK_SHIFT, 9\r | |
| 27 | \r | |
| f3eb2131 | 28 | .org 0x0\r |
| 29 | \r | |
| ae3d1e91 | 30 | .global _start\r |
| f3eb2131 | 31 | _start:\r |
| ae3d1e91 | 32 | \r |
| 819958c6 | 33 | Ia32Jump: \r |
| 34 | jmp BootSectorEntryPoint # JMP inst - 3 bytes\r | |
| 35 | nop\r | |
| 36 | \r | |
| 37 | OemId: .ascii "INTEL " # OemId - 8 bytes\r | |
| 38 | \r | |
| 39 | SectorSize: .word 0 # Sector Size - 16 bits\r | |
| 40 | SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits\r | |
| 41 | ReservedSectors: .word 0 # Reserved Sectors - 16 bits\r | |
| 42 | NoFats: .byte 0 # Number of FATs - 8 bits\r | |
| 43 | RootEntries: .word 0 # Root Entries - 16 bits\r | |
| 44 | Sectors: .word 0 # Number of Sectors - 16 bits\r | |
| 45 | Media: .byte 0 # Media - 8 bits - ignored\r | |
| 46 | SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits\r | |
| 47 | SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored\r | |
| 48 | Heads: .word 0 # Heads - 16 bits - ignored\r | |
| 49 | HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored\r | |
| 50 | LargeSectors: .long 0 # Large Sectors - 32 bits \r | |
| 51 | PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored\r | |
| 52 | CurrentHead: .byte 0 # Current Head - 8 bits\r | |
| 53 | Signature: .byte 0 # Signature - 8 bits - ignored\r | |
| 54 | VolId: .ascii " " # Volume Serial Number- 4 bytes\r | |
| 55 | FatLabel: .ascii " " # Label - 11 bytes\r | |
| 56 | SystemId: .ascii "FAT12 " # SystemId - 8 bytes\r | |
| 57 | \r | |
| 58 | BootSectorEntryPoint: \r | |
| 59 | #ASSUME ds:@code\r | |
| 60 | #ASSUME ss:@code\r | |
| 61 | # ds = 1000, es = 2000 + x (size of first cluster >> 4)\r | |
| 62 | # cx = Start Cluster of EfiLdr\r | |
| 63 | # dx = Start Cluster of Efivar.bin\r | |
| 64 | \r | |
| 65 | # Re use the BPB data stored in Boot Sector\r | |
| 66 | movw $0x7c00, %bp\r | |
| 67 | \r | |
| 68 | pushw %cx\r | |
| 69 | # Read Efivar.bin\r | |
| 70 | # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r | |
| 71 | movw $0x1900, %ax\r | |
| 72 | movw %ax, %es\r | |
| 73 | testw %dx, %dx\r | |
| 74 | jnz CheckVarStoreSize\r | |
| 75 | \r | |
| 76 | movb $1, %al\r | |
| 77 | NoVarStore: \r | |
| 78 | pushw %es\r | |
| 79 | # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r | |
| 640a2e52 | 80 | movb %al, %es:(4)\r |
| 819958c6 | 81 | jmp SaveVolumeId\r |
| 82 | \r | |
| 83 | CheckVarStoreSize: \r | |
| 84 | movw %dx, %di\r | |
| 85 | cmpl $0x4000, %ds:2(%di)\r | |
| 86 | movb $2, %al\r | |
| 87 | jne NoVarStore\r | |
| 88 | \r | |
| 89 | LoadVarStore: \r | |
| 90 | movb $0, %al\r | |
| f3fb74cd | 91 | movb %al, %es:(4)\r |
| 819958c6 | 92 | movw (%di), %cx\r |
| 93 | # ES:DI = 1500:0\r | |
| 94 | xorw %di, %di\r | |
| 95 | pushw %es\r | |
| 96 | movw $0x1500, %ax\r | |
| 97 | movw %ax, %es\r | |
| 98 | call ReadFile\r | |
| 99 | SaveVolumeId: \r | |
| 100 | popw %es\r | |
| 101 | movw VolId(%bp), %ax\r | |
| f3fb74cd | 102 | movw %ax, %es:(0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r |
| 819958c6 | 103 | movw VolId+2(%bp), %ax\r |
| f3fb74cd | 104 | movw %ax, %es:(2)\r |
| 819958c6 | 105 | \r |
| 106 | # Read Efildr\r | |
| 107 | popw %cx\r | |
| 108 | # cx = Start Cluster of Efildr -> BS.com has filled already\r | |
| 109 | # ES:DI = 2000:0, first cluster will be read again\r | |
| 110 | xorw %di, %di # di = 0\r | |
| 111 | movw $0x2000, %ax\r | |
| 112 | movw %ax, %es\r | |
| 113 | call ReadFile\r | |
| 114 | movw %cs, %ax\r | |
| 115 | movw %ax, %cs:JumpSegment\r | |
| 116 | \r | |
| 117 | JumpFarInstruction: \r | |
| 118 | .byte 0xea\r | |
| 119 | JumpOffset: \r | |
| 120 | .word 0x200\r | |
| 121 | JumpSegment: \r | |
| 122 | .word 0x2000\r | |
| 123 | \r | |
| 124 | \r | |
| 125 | \r | |
| 126 | # ****************************************************************************\r | |
| 127 | # ReadFile\r | |
| 128 | #\r | |
| 129 | # Arguments:\r | |
| 130 | # CX = Start Cluster of File\r | |
| 131 | # ES:DI = Buffer to store file content read from disk\r | |
| 132 | #\r | |
| 133 | # Return:\r | |
| 134 | # (ES << 4 + DI) = end of file content Buffer\r | |
| 135 | #\r | |
| 136 | # ****************************************************************************\r | |
| 137 | ReadFile: \r | |
| 138 | # si = NumberOfClusters\r | |
| 139 | # cx = ClusterNumber\r | |
| 140 | # dx = CachedFatSectorNumber\r | |
| 141 | # ds:0000 = CacheFatSectorBuffer\r | |
| 142 | # es:di = Buffer to load file\r | |
| 143 | # bx = NextClusterNumber\r | |
| 144 | pusha\r | |
| 145 | movw $1, %si # NumberOfClusters = 1\r | |
| 146 | pushw %cx # Push Start Cluster onto stack\r | |
| 147 | movw $0xfff, %dx # CachedFatSectorNumber = 0xfff\r | |
| 148 | FatChainLoop: \r | |
| 149 | movw %cx, %ax # ax = ClusterNumber \r | |
| 150 | andw $0xff8, %ax # ax = ax & 0xff8\r | |
| 151 | cmpw $0xff8, %ax # See if this is the last cluster\r | |
| 152 | je FoundLastCluster # Jump if last cluster found\r | |
| 153 | movw %cx, %ax # ax = ClusterNumber\r | |
| 154 | shlw %ax # ax = ClusterNumber * 2\r | |
| 155 | addw %cx, %ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3\r | |
| 156 | shrw %ax # FatOffset = ClusterNumber*3 / 2\r | |
| 157 | pushw %si # Save si\r | |
| 158 | movw %ax, %si # si = FatOffset\r | |
| ccec4c39 | 159 | shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT\r |
| 819958c6 | 160 | addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r |
| ccec4c39 | 161 | andw $BLOCK_MASK,%si # si = FatOffset & BLOCK_MASK\r |
| 819958c6 | 162 | cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber\r |
| 163 | je SkipFatRead\r | |
| 164 | movw $2, %bx\r | |
| 165 | pushw %es\r | |
| 166 | pushw %ds\r | |
| 167 | popw %es\r | |
| 168 | call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI\r | |
| 169 | popw %es\r | |
| 170 | movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber\r | |
| 171 | SkipFatRead: \r | |
| 172 | movw (%si), %bx # bx = NextClusterNumber\r | |
| 173 | movw %cx, %ax # ax = ClusterNumber\r | |
| 174 | andw $1, %ax # See if this is an odd cluster number\r | |
| 175 | je EvenFatEntry\r | |
| 176 | shrw $4, %bx # NextClusterNumber = NextClusterNumber >> 4\r | |
| 177 | EvenFatEntry: \r | |
| 178 | andw $0xfff, %bx # Strip upper 4 bits of NextClusterNumber\r | |
| 179 | popw %si # Restore si\r | |
| 180 | decw %bx # bx = NextClusterNumber - 1\r | |
| 181 | cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber\r | |
| 182 | jne ReadClusters\r | |
| 183 | incw %bx # bx = NextClusterNumber\r | |
| 184 | incw %si # NumberOfClusters++\r | |
| 185 | movw %bx, %cx # ClusterNumber = NextClusterNumber\r | |
| 186 | jmp FatChainLoop\r | |
| 187 | ReadClusters: \r | |
| 188 | incw %bx\r | |
| 189 | popw %ax # ax = StartCluster\r | |
| 190 | pushw %bx # StartCluster = NextClusterNumber\r | |
| 191 | movw %bx, %cx # ClusterNumber = NextClusterNumber\r | |
| 192 | subw $2, %ax # ax = StartCluster - 2\r | |
| 193 | xorb %bh, %bh\r | |
| 194 | movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r | |
| 195 | mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster\r | |
| 196 | addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r | |
| 197 | pushw %ax # save start sector\r | |
| 198 | movw %si, %ax # ax = NumberOfClusters\r | |
| 199 | mulw %bx # ax = NumberOfClusters * SectorsPerCluster\r | |
| 200 | movw %ax, %bx # bx = Number of Sectors\r | |
| 201 | popw %ax # ax = Start Sector\r | |
| 202 | call ReadBlocks\r | |
| 203 | movw $1, %si # NumberOfClusters = 1\r | |
| 204 | jmp FatChainLoop\r | |
| 205 | FoundLastCluster: \r | |
| 206 | popw %cx\r | |
| 207 | popa\r | |
| 208 | ret\r | |
| 209 | \r | |
| 210 | \r | |
| 211 | # ****************************************************************************\r | |
| 212 | # ReadBlocks - Reads a set of blocks from a block device\r | |
| 213 | #\r | |
| 214 | # AX = Start LBA\r | |
| 215 | # BX = Number of Blocks to Read\r | |
| 216 | # ES:DI = Buffer to store sectors read from disk\r | |
| 217 | # ****************************************************************************\r | |
| 218 | \r | |
| 219 | # cx = Blocks\r | |
| 220 | # bx = NumberOfBlocks\r | |
| 221 | # si = StartLBA\r | |
| 222 | \r | |
| 223 | ReadBlocks: \r | |
| 224 | pusha\r | |
| ded312f1 | 225 | addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA\r |
| 819958c6 | 226 | addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA\r |
| 227 | movl %eax, %esi # esi = Start LBA\r | |
| 228 | movw %bx, %cx # cx = Number of blocks to read\r | |
| 229 | ReadCylinderLoop: \r | |
| 230 | movw $0x7bfc, %bp # bp = 0x7bfc\r | |
| 231 | movl %esi, %eax # eax = Start LBA\r | |
| 232 | xorl %edx, %edx # edx = 0\r | |
| 233 | movzwl (%bp), %ebx # bx = MaxSector\r | |
| 234 | divl %ebx # ax = StartLBA / MaxSector\r | |
| 235 | incw %dx # dx = (StartLBA % MaxSector) + 1\r | |
| 236 | \r | |
| 237 | movw (%bp), %bx # bx = MaxSector\r | |
| 238 | subw %dx, %bx # bx = MaxSector - Sector\r | |
| 239 | incw %bx # bx = MaxSector - Sector + 1\r | |
| 240 | cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1)\r | |
| 241 | jg LimitTransfer\r | |
| 242 | movw %cx, %bx # bx = Blocks\r | |
| 243 | LimitTransfer: \r | |
| 244 | pushw %ax # save ax\r | |
| 245 | movw %es, %ax # ax = es\r | |
| f3fb74cd | 246 | shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system\r |
| 819958c6 | 247 | andw $0x7f, %ax # ax = Number of blocks into current seg\r |
| 248 | addw %bx, %ax # ax = End Block number of transfer\r | |
| 249 | cmpw $0x80, %ax # See if it crosses a 64K boundry\r | |
| 250 | jle NotCrossing64KBoundry # Branch if not crossing 64K boundry\r | |
| 251 | subw $0x80, %ax # ax = Number of blocks past 64K boundry\r | |
| 252 | subw %ax, %bx # Decrease transfer size by block overage\r | |
| 253 | NotCrossing64KBoundry: \r | |
| 254 | popw %ax # restore ax\r | |
| 255 | \r | |
| 256 | pushw %cx\r | |
| 257 | movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector\r | |
| 258 | xorw %dx, %dx # dx = 0\r | |
| 259 | divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder \r | |
| 260 | # dx = ax % (MaxHead + 1) = Head\r | |
| 261 | \r | |
| 262 | pushw %bx # Save number of blocks to transfer\r | |
| 263 | movb %dl, %dh # dh = Head\r | |
| 264 | movw $0x7c00, %bp # bp = 0x7c00\r | |
| 265 | movb PhysicalDrive(%bp), %dl # dl = Drive Number\r | |
| 266 | movb %al, %ch # ch = Cylinder\r | |
| 267 | movb %bl, %al # al = Blocks\r | |
| 268 | movb $2, %ah # ah = Function 2\r | |
| 269 | movw %di, %bx # es:bx = Buffer address\r | |
| 270 | int $0x13\r | |
| 271 | jc DiskError\r | |
| 272 | popw %bx\r | |
| 273 | popw %cx\r | |
| 274 | movzwl %bx, %ebx\r | |
| 275 | addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks\r | |
| 276 | subw %bx, %cx # Blocks = Blocks - NumberOfBlocks\r | |
| 277 | movw %es, %ax\r | |
| f3fb74cd | 278 | shlw $(BLOCK_SHIFT-4), %bx\r |
| 819958c6 | 279 | addw %bx, %ax\r |
| 280 | movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r | |
| 281 | cmpw $0, %cx\r | |
| 282 | jne ReadCylinderLoop\r | |
| 283 | popa\r | |
| 284 | ret\r | |
| 285 | \r | |
| 286 | DiskError: \r | |
| 287 | pushw %cs\r | |
| 288 | popw %ds\r | |
| ccec4c39 | 289 | leaw ErrorString, %si\r |
| 819958c6 | 290 | movw $7, %cx\r |
| 291 | jmp PrintStringAndHalt\r | |
| 292 | \r | |
| 293 | PrintStringAndHalt: \r | |
| 294 | movw $0xb800, %ax\r | |
| 295 | movw %ax, %es\r | |
| 296 | movw $160, %di\r | |
| 297 | rep\r | |
| 298 | movsw\r | |
| 299 | Halt: \r | |
| 300 | jmp Halt\r | |
| 301 | \r | |
| 302 | ErrorString: \r | |
| 303 | .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c\r | |
| 304 | \r | |
| f3fb74cd | 305 | .org 0x01fa\r |
| 819958c6 | 306 | LBAOffsetForBootSector: \r |
| 307 | .long 0x0\r | |
| 308 | \r | |
| f3fb74cd | 309 | .org 0x01fe\r |
| 819958c6 | 310 | .word 0xaa55\r |
| 311 | \r | |
| 312 | #******************************************************************************\r | |
| 313 | #******************************************************************************\r | |
| 314 | #******************************************************************************\r | |
| 315 | \r | |
| 316 | .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay\r | |
| 317 | .equ KBD_CONTROL_PORT, 0x060 # 8042 control port \r | |
| 318 | .equ KBD_STATUS_PORT, 0x064 # 8042 status port \r | |
| 319 | .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port\r | |
| 320 | .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20\r | |
| 321 | \r | |
| ded312f1 | 322 | .org 0x200\r |
| 819958c6 | 323 | jmp start\r |
| 324 | Em64String: \r | |
| 325 | .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 | |
| 326 | \r | |
| 327 | start: \r | |
| 328 | movw %cs, %ax\r | |
| 329 | movw %ax, %ds\r | |
| 330 | movw %ax, %es\r | |
| 331 | movw %ax, %ss\r | |
| 332 | movw $MyStack, %sp\r | |
| 333 | \r | |
| 334 | # mov ax,0b800h\r | |
| 335 | # mov es,ax\r | |
| 336 | # mov byte ptr es:[160],'a'\r | |
| 337 | # mov ax,cs\r | |
| 338 | # mov es,ax\r | |
| 339 | \r | |
| 340 | movl $0, %ebx\r | |
| 341 | leal MemoryMap, %edi\r | |
| 342 | MemMapLoop: \r | |
| 343 | movl $0xe820, %eax\r | |
| 344 | movl $20, %ecx\r | |
| 9ffd16fb | 345 | movl $0x534d4150, %edx # SMAP\r |
| 819958c6 | 346 | int $0x15\r |
| 347 | jc MemMapDone\r | |
| 348 | addl $20, %edi\r | |
| 349 | cmpl $0, %ebx\r | |
| 350 | je MemMapDone\r | |
| 351 | jmp MemMapLoop\r | |
| 352 | MemMapDone: \r | |
| 353 | leal MemoryMap, %eax\r | |
| 354 | subl %eax, %edi # Get the address of the memory map\r | |
| 355 | movl %edi, MemoryMapSize # Save the size of the memory map\r | |
| 356 | \r | |
| 357 | xorl %ebx, %ebx\r | |
| 358 | movw %cs, %bx # BX=segment\r | |
| 359 | shll $4, %ebx # BX="linear" address of segment base\r | |
| ded312f1 | 360 | leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt\r |
| 361 | movl %eax, (gdtr + 2) # Put address of gdt into the gdtr\r | |
| 362 | leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt\r | |
| 363 | movl %eax, (idtr + 2) # Put address of idt into the idtr\r | |
| 364 | leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map\r | |
| 819958c6 | 365 | \r |
| 366 | addl $0x1000, %ebx # Source of EFI32\r | |
| 367 | movl %ebx, JUMP+2\r | |
| 368 | addl $0x1000, %ebx\r | |
| 369 | movl %ebx, %esi # Source of EFILDR32\r | |
| 370 | \r | |
| 371 | # mov ax,0b800h\r | |
| 372 | # mov es,ax\r | |
| 373 | # mov byte ptr es:[162],'b'\r | |
| 374 | # mov ax,cs\r | |
| 375 | # mov es,ax\r | |
| 376 | \r | |
| 377 | #\r | |
| 378 | # Enable A20 Gate \r | |
| 379 | #\r | |
| 380 | \r | |
| 381 | movw $0x2401, %ax # Enable A20 Gate\r | |
| 382 | int $0x15\r | |
| 383 | jnc A20GateEnabled # Jump if it suceeded\r | |
| 384 | \r | |
| 385 | #\r | |
| 386 | # If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r | |
| 387 | #\r | |
| 388 | \r | |
| 389 | call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r | |
| 390 | jnz Timeout8042 # Jump if the 8042 timed out\r | |
| 391 | outw %ax, $DELAY_PORT # Delay 1 uS\r | |
| 392 | mov $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r | |
| 393 | out %al, $KBD_STATUS_PORT # Send command to the 8042\r | |
| 394 | call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r | |
| 395 | jnz Timeout8042 # Jump if the 8042 timed out\r | |
| 396 | mov $ENABLE_A20_CMD, %al # gate address bit 20 on\r | |
| 397 | out %al, $KBD_CONTROL_PORT # Send command to thre 8042\r | |
| 398 | call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r | |
| 399 | movw $25, %cx # Delay 25 uS for the command to complete on the 8042\r | |
| 400 | Delay25uS: \r | |
| 401 | outw %ax, $DELAY_PORT # Delay 1 uS\r | |
| 402 | loop Delay25uS\r | |
| 403 | Timeout8042: \r | |
| 404 | \r | |
| 405 | \r | |
| 406 | A20GateEnabled: \r | |
| 407 | \r | |
| 408 | #\r | |
| 409 | # DISABLE INTERRUPTS - Entering Protected Mode\r | |
| 410 | #\r | |
| 411 | \r | |
| 412 | cli\r | |
| 413 | \r | |
| 414 | # mov ax,0b800h\r | |
| 415 | # mov es,ax\r | |
| 416 | # mov byte ptr es:[164],'c'\r | |
| 417 | # mov ax,cs\r | |
| 418 | # mov es,ax\r | |
| 419 | \r | |
| 420 | .byte 0x66\r | |
| 421 | lgdt gdtr\r | |
| 422 | .byte 0x66\r | |
| 423 | lidt idtr\r | |
| 424 | \r | |
| 425 | movl %cr0, %eax\r | |
| 426 | orb $1, %al\r | |
| 427 | movl %eax, %cr0\r | |
| 428 | \r | |
| 429 | movl $0x008, %eax # Flat data descriptor\r | |
| 430 | movl $0x00400000, %ebp # Destination of EFILDR32\r | |
| 431 | movl $0x00070000, %ebx # Length of copy\r | |
| 432 | \r | |
| 433 | JUMP: \r | |
| 434 | # jmp far 0010:00020000\r | |
| 435 | .byte 0x66\r | |
| 436 | .byte 0xea\r | |
| 437 | .long 0x00020000\r | |
| 438 | .word 0x0010\r | |
| 439 | \r | |
| 440 | Empty8042InputBuffer: \r | |
| 441 | movw $0, %cx\r | |
| 442 | Empty8042Loop: \r | |
| 443 | outw %ax, $DELAY_PORT # Delay 1us\r | |
| 444 | in $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r | |
| 445 | andb $0x2, %al # Check the Input Buffer Full Flag\r | |
| 446 | loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r | |
| 447 | ret\r | |
| 448 | \r | |
| 449 | ##############################################################################\r | |
| 450 | # data\r | |
| 451 | ##############################################################################\r | |
| 452 | \r | |
| 9811c392 | 453 | .p2align 1\r |
| 819958c6 | 454 | \r |
| 455 | gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r | |
| 456 | .long 0 # (GDT base gets set above)\r | |
| 457 | ##############################################################################\r | |
| 458 | # global descriptor table (GDT)\r | |
| 459 | ##############################################################################\r | |
| 460 | \r | |
| 9811c392 | 461 | .p2align 1\r |
| 819958c6 | 462 | \r |
| 463 | GDT_BASE: \r | |
| 464 | # null descriptor\r | |
| 465 | .equ NULL_SEL, .-GDT_BASE\r | |
| 466 | .word 0 # limit 15:0\r | |
| 467 | .word 0 # base 15:0\r | |
| 468 | .byte 0 # base 23:16\r | |
| 469 | .byte 0 # type\r | |
| 470 | .byte 0 # limit 19:16, flags\r | |
| 471 | .byte 0 # base 31:24\r | |
| 472 | \r | |
| 473 | # linear data segment descriptor\r | |
| 474 | .equ LINEAR_SEL, .-GDT_BASE\r | |
| 475 | .word 0xFFFF # limit 0xFFFFF\r | |
| 476 | .word 0 # base 0\r | |
| 477 | .byte 0\r | |
| 478 | .byte 0x92 # present, ring 0, data, expand-up, writable\r | |
| 479 | .byte 0xCF # page-granular, 32-bit\r | |
| 480 | .byte 0\r | |
| 481 | \r | |
| 482 | # linear code segment descriptor\r | |
| 483 | .equ LINEAR_CODE_SEL, .-GDT_BASE\r | |
| 484 | .word 0xFFFF # limit 0xFFFFF\r | |
| 485 | .word 0 # base 0\r | |
| 486 | .byte 0\r | |
| 487 | .byte 0x9A # present, ring 0, data, expand-up, writable\r | |
| 488 | .byte 0xCF # page-granular, 32-bit\r | |
| 489 | .byte 0\r | |
| 490 | \r | |
| 491 | # system data segment descriptor\r | |
| 492 | .equ SYS_DATA_SEL, .-GDT_BASE\r | |
| 493 | .word 0xFFFF # limit 0xFFFFF\r | |
| 494 | .word 0 # base 0\r | |
| 495 | .byte 0\r | |
| 496 | .byte 0x92 # present, ring 0, data, expand-up, writable\r | |
| 497 | .byte 0xCF # page-granular, 32-bit\r | |
| 498 | .byte 0\r | |
| 499 | \r | |
| 500 | # system code segment descriptor\r | |
| 501 | .equ SYS_CODE_SEL, .-GDT_BASE\r | |
| 502 | .word 0xFFFF # limit 0xFFFFF\r | |
| 503 | .word 0 # base 0\r | |
| 504 | .byte 0\r | |
| 505 | .byte 0x9A # present, ring 0, data, expand-up, writable\r | |
| 506 | .byte 0xCF # page-granular, 32-bit\r | |
| 507 | .byte 0\r | |
| 508 | \r | |
| 509 | # spare segment descriptor\r | |
| 510 | .equ SPARE3_SEL, .-GDT_BASE\r | |
| 511 | .word 0 # limit 0xFFFFF\r | |
| 512 | .word 0 # base 0\r | |
| 513 | .byte 0\r | |
| 514 | .byte 0 # present, ring 0, data, expand-up, writable\r | |
| 515 | .byte 0 # page-granular, 32-bit\r | |
| 516 | .byte 0\r | |
| 517 | \r | |
| 518 | # spare segment descriptor\r | |
| 519 | .equ SPARE4_SEL, .-GDT_BASE\r | |
| 520 | .word 0 # limit 0xFFFFF\r | |
| 521 | .word 0 # base 0\r | |
| 522 | .byte 0\r | |
| 523 | .byte 0 # present, ring 0, data, expand-up, writable\r | |
| 524 | .byte 0 # page-granular, 32-bit\r | |
| 525 | .byte 0\r | |
| 526 | \r | |
| 527 | # spare segment descriptor\r | |
| 528 | .equ SPARE5_SEL, .-GDT_BASE\r | |
| 529 | .word 0 # limit 0xFFFFF\r | |
| 530 | .word 0 # base 0\r | |
| 531 | .byte 0\r | |
| 532 | .byte 0 # present, ring 0, data, expand-up, writable\r | |
| 533 | .byte 0 # page-granular, 32-bit\r | |
| 534 | .byte 0\r | |
| 535 | \r | |
| 536 | GDT_END: \r | |
| 537 | \r | |
| 9811c392 | 538 | .p2align 1\r |
| 819958c6 | 539 | \r |
| 540 | \r | |
| 541 | \r | |
| 542 | idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r | |
| 543 | .long 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 | |
| 9811c392 | 554 | .p2align 1\r |
| 819958c6 | 555 | \r |
| 556 | IDT_BASE: \r | |
| 557 | # divide by zero (INT 0)\r | |
| 558 | .equ DIV_ZERO_SEL, .-IDT_BASE\r | |
| 559 | .word 0 # offset 15:0\r | |
| 560 | .long SYS_CODE_SEL # selector 15:0\r | |
| 561 | .byte 0 # 0 for interrupt gate\r | |
| 562 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 563 | .word 0 # offset 31:16\r | |
| 564 | \r | |
| 565 | # debug exception (INT 1)\r | |
| 566 | .equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r | |
| 567 | .word 0 # offset 15:0\r | |
| 568 | .long SYS_CODE_SEL # selector 15:0\r | |
| 569 | .byte 0 # 0 for interrupt gate\r | |
| 570 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 571 | .word 0 # offset 31:16\r | |
| 572 | \r | |
| 573 | # NMI (INT 2)\r | |
| 574 | .equ NMI_SEL, .-IDT_BASE\r | |
| 575 | .word 0 # offset 15:0\r | |
| 576 | .long SYS_CODE_SEL # selector 15:0\r | |
| 577 | .byte 0 # 0 for interrupt gate\r | |
| 578 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 579 | .word 0 # offset 31:16\r | |
| 580 | \r | |
| 581 | # soft breakpoint (INT 3)\r | |
| 582 | .equ BREAKPOINT_SEL, .-IDT_BASE\r | |
| 583 | .word 0 # offset 15:0\r | |
| 584 | .long SYS_CODE_SEL # selector 15:0\r | |
| 585 | .byte 0 # 0 for interrupt gate\r | |
| 586 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 587 | .word 0 # offset 31:16\r | |
| 588 | \r | |
| 589 | # overflow (INT 4)\r | |
| 590 | .equ OVERFLOW_SEL, .-IDT_BASE\r | |
| 591 | .word 0 # offset 15:0\r | |
| 592 | .long SYS_CODE_SEL # selector 15:0\r | |
| 593 | .byte 0 # 0 for interrupt gate\r | |
| 594 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 595 | .word 0 # offset 31:16\r | |
| 596 | \r | |
| 597 | # bounds check (INT 5)\r | |
| 598 | .equ BOUNDS_CHECK_SEL, .-IDT_BASE\r | |
| 599 | .word 0 # offset 15:0\r | |
| 600 | .long SYS_CODE_SEL # selector 15:0\r | |
| 601 | .byte 0 # 0 for interrupt gate\r | |
| 602 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 603 | .word 0 # offset 31:16\r | |
| 604 | \r | |
| 605 | # invalid opcode (INT 6)\r | |
| 606 | .equ INVALID_OPCODE_SEL, .-IDT_BASE\r | |
| 607 | .word 0 # offset 15:0\r | |
| 608 | .long SYS_CODE_SEL # selector 15:0\r | |
| 609 | .byte 0 # 0 for interrupt gate\r | |
| 610 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 611 | .word 0 # offset 31:16\r | |
| 612 | \r | |
| 613 | # device not available (INT 7)\r | |
| 614 | .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r | |
| 615 | .word 0 # offset 15:0\r | |
| 616 | .long SYS_CODE_SEL # selector 15:0\r | |
| 617 | .byte 0 # 0 for interrupt gate\r | |
| 618 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 619 | .word 0 # offset 31:16\r | |
| 620 | \r | |
| 621 | # double fault (INT 8)\r | |
| 622 | .equ DOUBLE_FAULT_SEL, .-IDT_BASE\r | |
| 623 | .word 0 # offset 15:0\r | |
| 624 | .long SYS_CODE_SEL # selector 15:0\r | |
| 625 | .byte 0 # 0 for interrupt gate\r | |
| 626 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 627 | .word 0 # offset 31:16\r | |
| 628 | \r | |
| 629 | # Coprocessor segment overrun - reserved (INT 9)\r | |
| 630 | .equ RSVD_INTR_SEL1, .-IDT_BASE\r | |
| 631 | .word 0 # offset 15:0\r | |
| 632 | .long SYS_CODE_SEL # selector 15:0\r | |
| 633 | .byte 0 # 0 for interrupt gate\r | |
| 634 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 635 | .word 0 # offset 31:16\r | |
| 636 | \r | |
| 637 | # invalid TSS (INT 0x0a)\r | |
| 638 | .equ INVALID_TSS_SEL, .-IDT_BASE\r | |
| 639 | .word 0 # offset 15:0\r | |
| 640 | .long SYS_CODE_SEL # selector 15:0\r | |
| 641 | .byte 0 # 0 for interrupt gate\r | |
| 642 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 643 | .word 0 # offset 31:16\r | |
| 644 | \r | |
| 645 | # segment not present (INT 0x0b)\r | |
| 646 | .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r | |
| 647 | .word 0 # offset 15:0\r | |
| 648 | .long SYS_CODE_SEL # selector 15:0\r | |
| 649 | .byte 0 # 0 for interrupt gate\r | |
| 650 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 651 | .word 0 # offset 31:16\r | |
| 652 | \r | |
| 653 | # stack fault (INT 0x0c)\r | |
| 654 | .equ STACK_FAULT_SEL, .-IDT_BASE\r | |
| 655 | .word 0 # offset 15:0\r | |
| 656 | .long SYS_CODE_SEL # selector 15:0\r | |
| 657 | .byte 0 # 0 for interrupt gate\r | |
| 658 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 659 | .word 0 # offset 31:16\r | |
| 660 | \r | |
| 661 | # general protection (INT 0x0d)\r | |
| 662 | .equ GP_FAULT_SEL, .-IDT_BASE\r | |
| 663 | .word 0 # offset 15:0\r | |
| 664 | .long SYS_CODE_SEL # selector 15:0\r | |
| 665 | .byte 0 # 0 for interrupt gate\r | |
| 666 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 667 | .word 0 # offset 31:16\r | |
| 668 | \r | |
| 669 | # page fault (INT 0x0e)\r | |
| 670 | .equ PAGE_FAULT_SEL, .-IDT_BASE\r | |
| 671 | .word 0 # offset 15:0\r | |
| 672 | .long SYS_CODE_SEL # selector 15:0\r | |
| 673 | .byte 0 # 0 for interrupt gate\r | |
| 674 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 675 | .word 0 # offset 31:16\r | |
| 676 | \r | |
| 677 | # Intel reserved - do not use (INT 0x0f)\r | |
| 678 | .equ RSVD_INTR_SEL2, .-IDT_BASE\r | |
| 679 | .word 0 # offset 15:0\r | |
| 680 | .long SYS_CODE_SEL # selector 15:0\r | |
| 681 | .byte 0 # 0 for interrupt gate\r | |
| 682 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 683 | .word 0 # offset 31:16\r | |
| 684 | \r | |
| 685 | # floating point error (INT 0x10)\r | |
| 686 | .equ FLT_POINT_ERR_SEL, .-IDT_BASE\r | |
| 687 | .word 0 # offset 15:0\r | |
| 688 | .long SYS_CODE_SEL # selector 15:0\r | |
| 689 | .byte 0 # 0 for interrupt gate\r | |
| 690 | .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r | |
| 691 | .word 0 # offset 31:16\r | |
| 692 | \r | |
| 693 | # alignment check (INT 0x11)\r | |
| 694 | .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r | |
| 695 | .word 0 # offset 15:0\r | |
| 696 | .long SYS_CODE_SEL # selector 15:0\r | |
| 697 | .byte 0 # 0 for interrupt gate\r | |
| 698 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 699 | .word 0 # offset 31:16\r | |
| 700 | \r | |
| 701 | # machine check (INT 0x12)\r | |
| 702 | .equ MACHINE_CHECK_SEL, .-IDT_BASE\r | |
| 703 | .word 0 # offset 15:0\r | |
| 704 | .long SYS_CODE_SEL # selector 15:0\r | |
| 705 | .byte 0 # 0 for interrupt gate\r | |
| 706 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 707 | .word 0 # offset 31:16\r | |
| 708 | \r | |
| 709 | # SIMD floating-point exception (INT 0x13)\r | |
| 710 | .equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r | |
| 711 | .word 0 # offset 15:0\r | |
| 712 | .long SYS_CODE_SEL # selector 15:0\r | |
| 713 | .byte 0 # 0 for interrupt gate\r | |
| 714 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 715 | .word 0 # offset 31:16\r | |
| 716 | \r | |
| 717 | # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r | |
| b29a823d | 718 | .fill 85 * 8, 1, 0 # db (85 * 8) dup(0)\r |
| 819958c6 | 719 | \r |
| 720 | # IRQ 0 (System timer) - (INT 0x68)\r | |
| 721 | .equ IRQ0_SEL, .-IDT_BASE\r | |
| 722 | .word 0 # offset 15:0\r | |
| 723 | .long SYS_CODE_SEL # selector 15:0\r | |
| 724 | .byte 0 # 0 for interrupt gate\r | |
| 725 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 726 | .word 0 # offset 31:16\r | |
| 727 | \r | |
| 728 | # IRQ 1 (8042 Keyboard controller) - (INT 0x69)\r | |
| 729 | .equ IRQ1_SEL, .-IDT_BASE\r | |
| 730 | .word 0 # offset 15:0\r | |
| 731 | .long SYS_CODE_SEL # selector 15:0\r | |
| 732 | .byte 0 # 0 for interrupt gate\r | |
| 733 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 734 | .word 0 # offset 31:16\r | |
| 735 | \r | |
| 736 | # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 0x6a)\r | |
| 737 | .equ IRQ2_SEL, .-IDT_BASE\r | |
| 738 | .word 0 # offset 15:0\r | |
| 739 | .long SYS_CODE_SEL # selector 15:0\r | |
| 740 | .byte 0 # 0 for interrupt gate\r | |
| 741 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 742 | .word 0 # offset 31:16\r | |
| 743 | \r | |
| 744 | # IRQ 3 (COM 2) - (INT 0x6b)\r | |
| 745 | .equ IRQ3_SEL, .-IDT_BASE\r | |
| 746 | .word 0 # offset 15:0\r | |
| 747 | .long SYS_CODE_SEL # selector 15:0\r | |
| 748 | .byte 0 # 0 for interrupt gate\r | |
| 749 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 750 | .word 0 # offset 31:16\r | |
| 751 | \r | |
| 752 | # IRQ 4 (COM 1) - (INT 0x6c)\r | |
| 753 | .equ IRQ4_SEL, .-IDT_BASE\r | |
| 754 | .word 0 # offset 15:0\r | |
| 755 | .long SYS_CODE_SEL # selector 15:0\r | |
| 756 | .byte 0 # 0 for interrupt gate\r | |
| 757 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 758 | .word 0 # offset 31:16\r | |
| 759 | \r | |
| 760 | # IRQ 5 (LPT 2) - (INT 0x6d)\r | |
| 761 | .equ IRQ5_SEL, .-IDT_BASE\r | |
| 762 | .word 0 # offset 15:0\r | |
| 763 | .long SYS_CODE_SEL # selector 15:0\r | |
| 764 | .byte 0 # 0 for interrupt gate\r | |
| 765 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 766 | .word 0 # offset 31:16\r | |
| 767 | \r | |
| 768 | # IRQ 6 (Floppy controller) - (INT 0x6e)\r | |
| 769 | .equ IRQ6_SEL, .-IDT_BASE\r | |
| 770 | .word 0 # offset 15:0\r | |
| 771 | .long SYS_CODE_SEL # selector 15:0\r | |
| 772 | .byte 0 # 0 for interrupt gate\r | |
| 773 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 774 | .word 0 # offset 31:16\r | |
| 775 | \r | |
| 776 | # IRQ 7 (LPT 1) - (INT 0x6f)\r | |
| 777 | .equ IRQ7_SEL, .-IDT_BASE\r | |
| 778 | .word 0 # offset 15:0\r | |
| 779 | .long SYS_CODE_SEL # selector 15:0\r | |
| 780 | .byte 0 # 0 for interrupt gate\r | |
| 781 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 782 | .word 0 # offset 31:16\r | |
| 783 | \r | |
| 784 | # IRQ 8 (RTC Alarm) - (INT 0x70)\r | |
| 785 | .equ IRQ8_SEL, .-IDT_BASE\r | |
| 786 | .word 0 # offset 15:0\r | |
| 787 | .long SYS_CODE_SEL # selector 15:0\r | |
| 788 | .byte 0 # 0 for interrupt gate\r | |
| 789 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 790 | .word 0 # offset 31:16\r | |
| 791 | \r | |
| 792 | # IRQ 9 - (INT 0x71)\r | |
| 793 | .equ IRQ9_SEL, .-IDT_BASE\r | |
| 794 | .word 0 # offset 15:0\r | |
| 795 | .long SYS_CODE_SEL # selector 15:0\r | |
| 796 | .byte 0 # 0 for interrupt gate\r | |
| 797 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 798 | .word 0 # offset 31:16\r | |
| 799 | \r | |
| 800 | # IRQ 10 - (INT 0x72)\r | |
| 801 | .equ IRQ10_SEL, .-IDT_BASE\r | |
| 802 | .word 0 # offset 15:0\r | |
| 803 | .long SYS_CODE_SEL # selector 15:0\r | |
| 804 | .byte 0 # 0 for interrupt gate\r | |
| 805 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 806 | .word 0 # offset 31:16\r | |
| 807 | \r | |
| 808 | # IRQ 11 - (INT 0x73)\r | |
| 809 | .equ IRQ11_SEL, .-IDT_BASE\r | |
| 810 | .word 0 # offset 15:0\r | |
| 811 | .long SYS_CODE_SEL # selector 15:0\r | |
| 812 | .byte 0 # 0 for interrupt gate\r | |
| 813 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 814 | .word 0 # offset 31:16\r | |
| 815 | \r | |
| 816 | # IRQ 12 (PS/2 mouse) - (INT 0x74)\r | |
| 817 | .equ IRQ12_SEL, .-IDT_BASE\r | |
| 818 | .word 0 # offset 15:0\r | |
| 819 | .long SYS_CODE_SEL # selector 15:0\r | |
| 820 | .byte 0 # 0 for interrupt gate\r | |
| 821 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 822 | .word 0 # offset 31:16\r | |
| 823 | \r | |
| 824 | # IRQ 13 (Floating point error) - (INT 0x75)\r | |
| 825 | .equ IRQ13_SEL, .-IDT_BASE\r | |
| 826 | .word 0 # offset 15:0\r | |
| 827 | .long SYS_CODE_SEL # selector 15:0\r | |
| 828 | .byte 0 # 0 for interrupt gate\r | |
| 829 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 830 | .word 0 # offset 31:16\r | |
| 831 | \r | |
| 832 | # IRQ 14 (Secondary IDE) - (INT 0x76)\r | |
| 833 | .equ IRQ14_SEL, .-IDT_BASE\r | |
| 834 | .word 0 # offset 15:0\r | |
| 835 | .long SYS_CODE_SEL # selector 15:0\r | |
| 836 | .byte 0 # 0 for interrupt gate\r | |
| 837 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 838 | .word 0 # offset 31:16\r | |
| 839 | \r | |
| 840 | # IRQ 15 (Primary IDE) - (INT 0x77)\r | |
| 841 | .equ IRQ15_SEL, .-IDT_BASE\r | |
| 842 | .word 0 # offset 15:0\r | |
| 843 | .long SYS_CODE_SEL # selector 15:0\r | |
| 844 | .byte 0 # 0 for interrupt gate\r | |
| 845 | .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r | |
| 846 | .word 0 # offset 31:16\r | |
| 847 | \r | |
| 848 | IDT_END: \r | |
| 849 | \r | |
| 9811c392 | 850 | .p2align 1\r |
| 819958c6 | 851 | \r |
| 852 | MemoryMapSize: .long 0\r | |
| 853 | MemoryMap: .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 | .long 0,0,0,0,0,0,0,0\r | |
| 877 | .long 0,0,0,0,0,0,0,0\r | |
| 878 | .long 0,0,0,0,0,0,0,0\r | |
| 879 | .long 0,0,0,0,0,0,0,0\r | |
| 880 | .long 0,0,0,0,0,0,0,0\r | |
| 881 | .long 0,0,0,0,0,0,0,0\r | |
| 882 | .long 0,0,0,0,0,0,0,0\r | |
| 883 | \r | |
| 884 | .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 | |
| 885 | .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 | |
| 886 | \r | |
| 887 | .org 0x0fe0\r | |
| 888 | MyStack: \r | |
| 889 | # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r | |
| 890 | # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r | |
| 891 | # known low address (20f00) so it can be set up by PlMapIrqToVect in\r | |
| 892 | # 8259.c\r | |
| 893 | \r | |
| 894 | int $8\r | |
| 895 | iret\r | |
| 896 | \r | |
| 897 | int $9\r | |
| 898 | iret\r | |
| 899 | \r | |
| 900 | int $10\r | |
| 901 | iret\r | |
| 902 | \r | |
| 903 | int $11\r | |
| 904 | iret\r | |
| 905 | \r | |
| 906 | int $12\r | |
| 907 | iret\r | |
| 908 | \r | |
| 909 | int $13\r | |
| 910 | iret\r | |
| 911 | \r | |
| 912 | int $14\r | |
| 913 | iret\r | |
| 914 | \r | |
| 915 | int $15\r | |
| 916 | iret\r | |
| 917 | \r | |
| 918 | \r | |
| 919 | .org 0x0ffe\r | |
| 920 | BlockSignature: \r | |
| 921 | .word 0xaa55\r | |
| 922 | \r | |
| 923 | \r |