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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 | |
88e9055e | 18 | .stack: \r |
19 | .486p: \r | |
20 | .code16\r | |
819958c6 | 21 | \r |
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 | |
ae3d1e91 | 28 | .org 0x0 |
29 | ||
30 | .global _start\r | |
31 | _start: | |
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 | |
453 | .align 0x2\r | |
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 | |
461 | .align 0x2\r | |
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 | |
538 | .align 0x2\r | |
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 | |
554 | .align 0x2\r | |
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 | |
718 | .fill 85 * 8, 1, 0 # db (85 * 8) dup(0)\r | |
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 | |
850 | .align 0x2\r | |
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 |