]>
Commit | Line | Data |
---|---|---|
c69dd9df | 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 | ;* start32.asm\r | |
13 | ;* \r | |
14 | ;* Abstract:\r | |
15 | ;*\r | |
16 | ;------------------------------------------------------------------------------\r | |
17 | \r | |
18 | .model small\r | |
19 | .stack\r | |
20 | .486p\r | |
21 | .code\r | |
22 | \r | |
23 | FAT_DIRECTORY_ENTRY_SIZE EQU 020h\r | |
24 | FAT_DIRECTORY_ENTRY_SHIFT EQU 5\r | |
25 | BLOCK_SIZE EQU 0200h\r | |
26 | BLOCK_MASK EQU 01ffh\r | |
27 | BLOCK_SHIFT EQU 9\r | |
28 | \r | |
29 | org 0h\r | |
30 | Ia32Jump:\r | |
31 | jmp BootSectorEntryPoint ; JMP inst - 3 bytes\r | |
32 | nop\r | |
33 | \r | |
34 | OemId db "INTEL " ; OemId - 8 bytes\r | |
35 | SectorSize dw 0 ; Sector Size - 2 bytes\r | |
36 | SectorsPerCluster db 0 ; Sector Per Cluster - 1 byte\r | |
37 | ReservedSectors dw 0 ; Reserved Sectors - 2 bytes\r | |
38 | NoFats db 0 ; Number of FATs - 1 byte\r | |
39 | RootEntries dw 0 ; Root Entries - 2 bytes\r | |
40 | Sectors dw 0 ; Number of Sectors - 2 bytes\r | |
41 | Media db 0 ; Media - 1 byte\r | |
42 | SectorsPerFat16 dw 0 ; Sectors Per FAT for FAT12/FAT16 - 2 byte\r | |
43 | SectorsPerTrack dw 0 ; Sectors Per Track - 2 bytes\r | |
44 | Heads dw 0 ; Heads - 2 bytes\r | |
45 | HiddenSectors dd 0 ; Hidden Sectors - 4 bytes\r | |
46 | LargeSectors dd 0 ; Large Sectors - 4 bytes\r | |
47 | \r | |
48 | ;******************************************************************************\r | |
49 | ;\r | |
50 | ;The structure for FAT32 starting at offset 36 of the boot sector. (At this point, \r | |
51 | ;the BPB/boot sector for FAT12 and FAT16 differs from the BPB/boot sector for FAT32.)\r | |
52 | ;\r | |
53 | ;******************************************************************************\r | |
54 | \r | |
55 | SectorsPerFat32 dd 0 ; Sectors Per FAT for FAT32 - 4 bytes\r | |
56 | ExtFlags dw 0 ; Mirror Flag - 2 bytes\r | |
57 | FSVersion dw 0 ; File System Version - 2 bytes\r | |
58 | RootCluster dd 0 ; 1st Cluster Number of Root Dir - 4 bytes\r | |
59 | FSInfo dw 0 ; Sector Number of FSINFO - 2 bytes\r | |
60 | BkBootSector dw 0 ; Sector Number of Bk BootSector - 2 bytes\r | |
61 | Reserved db 12 dup(0) ; Reserved Field - 12 bytes\r | |
62 | PhysicalDrive db 0 ; Physical Drive Number - 1 byte\r | |
63 | Reserved1 db 0 ; Reserved Field - 1 byte\r | |
64 | Signature db 0 ; Extended Boot Signature - 1 byte\r | |
65 | VolId db " " ; Volume Serial Number - 4 bytes\r | |
66 | FatLabel db " " ; Volume Label - 11 bytes\r | |
67 | FileSystemType db "FAT32 " ; File System Type - 8 bytes\r | |
68 | \r | |
69 | BootSectorEntryPoint:\r | |
70 | ASSUME ds:@code\r | |
71 | ASSUME ss:@code\r | |
72 | ; ds = 1000, es = 2000 + x (size of first cluster >> 4)\r | |
73 | ; cx = Start Cluster of EfiLdr\r | |
74 | ; dx = Start Cluster of Efivar.bin\r | |
75 | \r | |
76 | ; Re use the BPB data stored in Boot Sector\r | |
77 | mov bp,07c00h\r | |
78 | \r | |
79 | \r | |
80 | push cx\r | |
81 | ; Read Efivar.bin\r | |
82 | ; 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r | |
83 | mov ax,01900h\r | |
84 | mov es,ax\r | |
85 | test dx,dx\r | |
86 | jnz CheckVarStoreSize\r | |
87 | \r | |
88 | mov al,1\r | |
89 | NoVarStore:\r | |
90 | push es\r | |
91 | ; Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r | |
92 | mov byte ptr es:[4],al\r | |
93 | jmp SaveVolumeId\r | |
94 | \r | |
95 | CheckVarStoreSize:\r | |
96 | mov di,dx\r | |
97 | cmp dword ptr ds:[di+2], 04000h\r | |
98 | mov al,2\r | |
99 | jne NoVarStore\r | |
100 | \r | |
101 | LoadVarStore:\r | |
102 | mov al,0\r | |
103 | mov byte ptr es:[4],al\r | |
104 | mov cx,word ptr[di]\r | |
105 | ; ES:DI = 1500:0\r | |
106 | xor di,di\r | |
107 | push es\r | |
108 | mov ax,01500h\r | |
109 | mov es,ax\r | |
110 | call ReadFile\r | |
111 | SaveVolumeId:\r | |
112 | pop es\r | |
113 | mov ax,word ptr [bp+VolId]\r | |
114 | mov word ptr es:[0],ax ; Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r | |
115 | mov ax,word ptr [bp+VolId+2]\r | |
116 | mov word ptr es:[2],ax\r | |
117 | \r | |
118 | ; Read Efildr\r | |
119 | pop cx\r | |
120 | ; cx = Start Cluster of Efildr -> BS.com has filled already\r | |
121 | ; ES:DI = 2000:0, first cluster will be read again\r | |
122 | xor di,di ; di = 0\r | |
123 | mov ax,02000h\r | |
124 | mov es,ax\r | |
125 | call ReadFile\r | |
126 | mov ax,cs\r | |
127 | mov word ptr cs:[JumpSegment],ax\r | |
128 | JumpFarInstruction:\r | |
129 | db 0eah\r | |
130 | JumpOffset:\r | |
131 | dw 0200h\r | |
132 | JumpSegment:\r | |
133 | dw 2000h\r | |
134 | \r | |
135 | \r | |
136 | \r | |
137 | \r | |
138 | ; ****************************************************************************\r | |
139 | ; ReadFile\r | |
140 | ;\r | |
141 | ; Arguments:\r | |
142 | ; CX = Start Cluster of File\r | |
143 | ; ES:DI = Buffer to store file content read from disk\r | |
144 | ;\r | |
145 | ; Return:\r | |
146 | ; (ES << 4 + DI) = end of file content Buffer\r | |
147 | ;\r | |
148 | ; ****************************************************************************\r | |
149 | ReadFile:\r | |
150 | ; si = NumberOfClusters\r | |
151 | ; cx = ClusterNumber\r | |
152 | ; dx = CachedFatSectorNumber\r | |
153 | ; ds:0000 = CacheFatSectorBuffer\r | |
154 | ; es:di = Buffer to load file\r | |
155 | ; bx = NextClusterNumber\r | |
156 | pusha\r | |
157 | mov si,1 ; NumberOfClusters = 1\r | |
158 | push cx ; Push Start Cluster onto stack\r | |
159 | mov dx,0fffh ; CachedFatSectorNumber = 0xfff\r | |
160 | FatChainLoop:\r | |
161 | mov ax,cx ; ax = ClusterNumber \r | |
162 | and ax,0fff8h ; ax = ax & 0xfff8\r | |
163 | cmp ax,0fff8h ; See if this is the last cluster\r | |
164 | je FoundLastCluster ; Jump if last cluster found\r | |
165 | mov ax,cx ; ax = ClusterNumber\r | |
166 | shl ax,2 ; FatOffset = ClusterNumber * 4\r | |
167 | push si ; Save si\r | |
168 | mov si,ax ; si = FatOffset\r | |
169 | shr ax,BLOCK_SHIFT ; ax = FatOffset >> BLOCK_SHIFT\r | |
170 | add ax,word ptr [bp+ReservedSectors] ; ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r | |
171 | and si,BLOCK_MASK ; si = FatOffset & BLOCK_MASK\r | |
172 | cmp ax,dx ; Compare FatSectorNumber to CachedFatSectorNumber\r | |
173 | je SkipFatRead\r | |
174 | mov bx,2 \r | |
175 | push es\r | |
176 | push ds\r | |
177 | pop es\r | |
178 | call ReadBlocks ; Read 2 blocks starting at AX storing at ES:DI\r | |
179 | pop es\r | |
180 | mov dx,ax ; CachedFatSectorNumber = FatSectorNumber\r | |
181 | SkipFatRead:\r | |
182 | mov bx,word ptr [si] ; bx = NextClusterNumber\r | |
183 | mov ax,cx ; ax = ClusterNumber\r | |
184 | pop si ; Restore si\r | |
185 | dec bx ; bx = NextClusterNumber - 1\r | |
186 | cmp bx,cx ; See if (NextClusterNumber-1)==ClusterNumber\r | |
187 | jne ReadClusters\r | |
188 | inc bx ; bx = NextClusterNumber\r | |
189 | inc si ; NumberOfClusters++\r | |
190 | mov cx,bx ; ClusterNumber = NextClusterNumber\r | |
191 | jmp FatChainLoop\r | |
192 | ReadClusters:\r | |
193 | inc bx\r | |
194 | pop ax ; ax = StartCluster\r | |
195 | push bx ; StartCluster = NextClusterNumber\r | |
196 | mov cx,bx ; ClusterNumber = NextClusterNumber\r | |
197 | sub ax,2 ; ax = StartCluster - 2\r | |
198 | xor bh,bh \r | |
199 | mov bl,byte ptr [bp+SectorsPerCluster] ; bx = SectorsPerCluster\r | |
200 | mul bx ; ax = (StartCluster - 2) * SectorsPerCluster\r | |
201 | add ax, word ptr [bp] ; ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r | |
202 | push ax ; save start sector\r | |
203 | mov ax,si ; ax = NumberOfClusters\r | |
204 | mul bx ; ax = NumberOfClusters * SectorsPerCluster\r | |
205 | mov bx,ax ; bx = Number of Sectors\r | |
206 | pop ax ; ax = Start Sector\r | |
207 | call ReadBlocks\r | |
208 | mov si,1 ; NumberOfClusters = 1\r | |
209 | jmp FatChainLoop\r | |
210 | FoundLastCluster:\r | |
211 | pop cx\r | |
212 | popa\r | |
213 | ret\r | |
214 | \r | |
215 | \r | |
216 | ; ****************************************************************************\r | |
217 | ; ReadBlocks - Reads a set of blocks from a block device\r | |
218 | ;\r | |
219 | ; AX = Start LBA\r | |
220 | ; BX = Number of Blocks to Read\r | |
221 | ; ES:DI = Buffer to store sectors read from disk\r | |
222 | ; ****************************************************************************\r | |
223 | \r | |
224 | ; cx = Blocks\r | |
225 | ; bx = NumberOfBlocks\r | |
226 | ; si = StartLBA\r | |
227 | \r | |
228 | ReadBlocks:\r | |
229 | pusha\r | |
230 | add eax,dword ptr [bp+LBAOffsetForBootSector] ; Add LBAOffsetForBootSector to Start LBA\r | |
231 | add eax,dword ptr [bp+HiddenSectors] ; Add HiddenSectors to Start LBA\r | |
232 | mov esi,eax ; esi = Start LBA\r | |
233 | mov cx,bx ; cx = Number of blocks to read\r | |
234 | ReadCylinderLoop:\r | |
235 | mov bp,07bfch ; bp = 0x7bfc\r | |
236 | mov eax,esi ; eax = Start LBA\r | |
237 | xor edx,edx ; edx = 0\r | |
238 | movzx ebx,word ptr [bp] ; bx = MaxSector\r | |
239 | div ebx ; ax = StartLBA / MaxSector\r | |
240 | inc dx ; dx = (StartLBA % MaxSector) + 1\r | |
241 | \r | |
242 | mov bx,word ptr [bp] ; bx = MaxSector\r | |
243 | sub bx,dx ; bx = MaxSector - Sector\r | |
244 | inc bx ; bx = MaxSector - Sector + 1\r | |
245 | cmp cx,bx ; Compare (Blocks) to (MaxSector - Sector + 1)\r | |
246 | jg LimitTransfer\r | |
247 | mov bx,cx ; bx = Blocks\r | |
248 | LimitTransfer:\r | |
249 | push ax ; save ax\r | |
250 | mov ax,es ; ax = es\r | |
251 | shr ax,(BLOCK_SHIFT-4) ; ax = Number of blocks into mem system\r | |
252 | and ax,07fh ; ax = Number of blocks into current seg\r | |
253 | add ax,bx ; ax = End Block number of transfer\r | |
254 | cmp ax,080h ; See if it crosses a 64K boundry\r | |
255 | jle NotCrossing64KBoundry ; Branch if not crossing 64K boundry\r | |
256 | sub ax,080h ; ax = Number of blocks past 64K boundry\r | |
257 | sub bx,ax ; Decrease transfer size by block overage\r | |
258 | NotCrossing64KBoundry:\r | |
259 | pop ax ; restore ax\r | |
260 | \r | |
261 | push cx\r | |
262 | mov cl,dl ; cl = (StartLBA % MaxSector) + 1 = Sector\r | |
263 | xor dx,dx ; dx = 0\r | |
264 | div word ptr [bp+2] ; ax = ax / (MaxHead + 1) = Cylinder \r | |
265 | ; dx = ax % (MaxHead + 1) = Head\r | |
266 | \r | |
267 | push bx ; Save number of blocks to transfer\r | |
268 | mov dh,dl ; dh = Head\r | |
269 | mov bp,07c00h ; bp = 0x7c00\r | |
270 | mov dl,byte ptr [bp+PhysicalDrive] ; dl = Drive Number\r | |
271 | mov ch,al ; ch = Cylinder\r | |
272 | mov al,bl ; al = Blocks\r | |
273 | mov ah,2 ; ah = Function 2\r | |
274 | mov bx,di ; es:bx = Buffer address\r | |
275 | int 013h\r | |
276 | jc DiskError\r | |
277 | pop bx\r | |
278 | pop cx\r | |
279 | movzx ebx,bx\r | |
280 | add esi,ebx ; StartLBA = StartLBA + NumberOfBlocks\r | |
281 | sub cx,bx ; Blocks = Blocks - NumberOfBlocks\r | |
282 | mov ax,es\r | |
283 | shl bx,(BLOCK_SHIFT-4)\r | |
284 | add ax,bx\r | |
285 | mov es,ax ; es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r | |
286 | cmp cx,0\r | |
287 | jne ReadCylinderLoop\r | |
288 | popa\r | |
289 | ret\r | |
290 | \r | |
291 | DiskError:\r | |
292 | push cs\r | |
293 | pop ds\r | |
294 | lea si, [ErrorString]\r | |
295 | mov cx, 7\r | |
296 | jmp PrintStringAndHalt\r | |
297 | \r | |
298 | PrintStringAndHalt:\r | |
299 | mov ax,0b800h\r | |
300 | mov es,ax\r | |
301 | mov di,160\r | |
302 | rep movsw\r | |
303 | Halt:\r | |
304 | jmp Halt\r | |
305 | \r | |
306 | ErrorString:\r | |
307 | db 'S', 0ch, 'E', 0ch, 'r', 0ch, 'r', 0ch, 'o', 0ch, 'r', 0ch, '!', 0ch\r | |
308 | \r | |
309 | org 01fah\r | |
310 | LBAOffsetForBootSector:\r | |
311 | dd 0h\r | |
312 | \r | |
313 | org 01feh\r | |
314 | dw 0aa55h\r | |
315 | \r | |
316 | ;******************************************************************************\r | |
317 | ;******************************************************************************\r | |
318 | ;******************************************************************************\r | |
319 | \r | |
320 | DELAY_PORT equ 0edh ; Port to use for 1uS delay\r | |
321 | KBD_CONTROL_PORT equ 060h ; 8042 control port \r | |
322 | KBD_STATUS_PORT equ 064h ; 8042 status port \r | |
323 | WRITE_DATA_PORT_CMD equ 0d1h ; 8042 command to write the data port\r | |
324 | ENABLE_A20_CMD equ 0dfh ; 8042 command to enable A20\r | |
325 | \r | |
326 | org 200h\r | |
327 | jmp start\r | |
328 | Em64String:\r | |
329 | db 'E', 0ch, 'm', 0ch, '6', 0ch, '4', 0ch, 'T', 0ch, ' ', 0ch, 'U', 0ch, 'n', 0ch, 's', 0ch, 'u', 0ch, 'p', 0ch, 'p', 0ch, 'o', 0ch, 'r', 0ch, 't', 0ch, 'e', 0ch, 'd', 0ch, '!', 0ch\r | |
330 | \r | |
331 | start: \r | |
332 | mov ax,cs\r | |
333 | mov ds,ax\r | |
334 | mov es,ax\r | |
335 | mov ss,ax\r | |
336 | mov sp,MyStack\r | |
337 | \r | |
338 | ; mov ax,0b800h\r | |
339 | ; mov es,ax\r | |
340 | ; mov byte ptr es:[160],'a'\r | |
341 | ; mov ax,cs\r | |
342 | ; mov es,ax\r | |
343 | \r | |
344 | mov ebx,0\r | |
345 | lea edi,MemoryMap\r | |
346 | MemMapLoop:\r | |
347 | mov eax,0e820h\r | |
348 | mov ecx,20\r | |
349 | mov edx,'SMAP'\r | |
350 | int 15h\r | |
351 | jc MemMapDone\r | |
352 | add edi,20\r | |
353 | cmp ebx,0\r | |
354 | je MemMapDone\r | |
355 | jmp MemMapLoop\r | |
356 | MemMapDone:\r | |
357 | lea eax,MemoryMap\r | |
358 | sub edi,eax ; Get the address of the memory map\r | |
359 | mov dword ptr [MemoryMapSize],edi ; Save the size of the memory map\r | |
360 | \r | |
361 | xor ebx,ebx\r | |
362 | mov bx,cs ; BX=segment\r | |
363 | shl ebx,4 ; BX="linear" address of segment base\r | |
364 | lea eax,[GDT_BASE + ebx] ; EAX=PHYSICAL address of gdt\r | |
365 | mov dword ptr [gdtr + 2],eax ; Put address of gdt into the gdtr\r | |
366 | lea eax,[IDT_BASE + ebx] ; EAX=PHYSICAL address of idt\r | |
367 | mov dword ptr [idtr + 2],eax ; Put address of idt into the idtr\r | |
368 | lea edx,[MemoryMapSize + ebx] ; Physical base address of the memory map\r | |
369 | \r | |
370 | add ebx,01000h ; Source of EFI32\r | |
371 | mov dword ptr [JUMP+2],ebx\r | |
372 | add ebx,01000h\r | |
373 | mov esi,ebx ; Source of EFILDR32\r | |
374 | \r | |
375 | ; mov ax,0b800h\r | |
376 | ; mov es,ax\r | |
377 | ; mov byte ptr es:[162],'b'\r | |
378 | ; mov ax,cs\r | |
379 | ; mov es,ax\r | |
380 | \r | |
381 | ;\r | |
382 | ; Enable A20 Gate \r | |
383 | ;\r | |
384 | \r | |
385 | mov ax,2401h ; Enable A20 Gate\r | |
386 | int 15h\r | |
387 | jnc A20GateEnabled ; Jump if it suceeded\r | |
388 | \r | |
389 | ;\r | |
390 | ; If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r | |
391 | ;\r | |
392 | \r | |
393 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r | |
394 | jnz Timeout8042 ; Jump if the 8042 timed out\r | |
395 | out DELAY_PORT,ax ; Delay 1 uS\r | |
396 | mov al,WRITE_DATA_PORT_CMD ; 8042 cmd to write output port\r | |
397 | out KBD_STATUS_PORT,al ; Send command to the 8042\r | |
398 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r | |
399 | jnz Timeout8042 ; Jump if the 8042 timed out\r | |
400 | mov al,ENABLE_A20_CMD ; gate address bit 20 on\r | |
401 | out KBD_CONTROL_PORT,al ; Send command to thre 8042\r | |
402 | call Empty8042InputBuffer ; Empty the Input Buffer on the 8042 controller\r | |
403 | mov cx,25 ; Delay 25 uS for the command to complete on the 8042\r | |
404 | Delay25uS:\r | |
405 | out DELAY_PORT,ax ; Delay 1 uS\r | |
406 | loop Delay25uS \r | |
407 | Timeout8042:\r | |
408 | \r | |
409 | \r | |
410 | A20GateEnabled:\r | |
411 | \r | |
412 | ;\r | |
413 | ; DISABLE INTERRUPTS - Entering Protected Mode\r | |
414 | ;\r | |
415 | \r | |
416 | cli \r | |
417 | \r | |
418 | ; mov ax,0b800h\r | |
419 | ; mov es,ax\r | |
420 | ; mov byte ptr es:[164],'c'\r | |
421 | ; mov ax,cs\r | |
422 | ; mov es,ax\r | |
423 | \r | |
424 | db 66h \r | |
425 | lgdt fword ptr [gdtr]\r | |
426 | db 66h \r | |
427 | lidt fword ptr [idtr]\r | |
428 | \r | |
429 | mov eax,cr0\r | |
430 | or al,1\r | |
431 | mov cr0,eax\r | |
432 | \r | |
433 | mov eax,0008h ; Flat data descriptor\r | |
434 | mov ebp,000400000h ; Destination of EFILDR32\r | |
435 | mov ebx,000070000h ; Length of copy\r | |
436 | \r | |
437 | JUMP:\r | |
438 | ; jmp far 0010:00020000\r | |
439 | db 066h\r | |
440 | db 0eah\r | |
441 | dd 000020000h\r | |
442 | dw 00010h\r | |
443 | \r | |
444 | Empty8042InputBuffer:\r | |
445 | mov cx,0\r | |
446 | Empty8042Loop:\r | |
447 | out DELAY_PORT,ax ; Delay 1us\r | |
448 | in al,KBD_STATUS_PORT ; Read the 8042 Status Port\r | |
449 | and al,02h ; Check the Input Buffer Full Flag\r | |
450 | loopnz Empty8042Loop ; Loop until the input buffer is empty or a timout of 65536 uS\r | |
451 | ret\r | |
452 | \r | |
453 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
454 | ; data\r | |
455 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
456 | \r | |
457 | align 02h\r | |
458 | \r | |
459 | gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit\r | |
460 | dd 0 ; (GDT base gets set above)\r | |
461 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
462 | ; global descriptor table (GDT)\r | |
463 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
464 | \r | |
465 | align 02h\r | |
466 | \r | |
467 | public GDT_BASE\r | |
468 | GDT_BASE:\r | |
469 | ; null descriptor\r | |
470 | NULL_SEL equ $-GDT_BASE\r | |
471 | dw 0 ; limit 15:0\r | |
472 | dw 0 ; base 15:0\r | |
473 | db 0 ; base 23:16\r | |
474 | db 0 ; type\r | |
475 | db 0 ; limit 19:16, flags\r | |
476 | db 0 ; base 31:24\r | |
477 | \r | |
478 | ; linear data segment descriptor\r | |
479 | LINEAR_SEL equ $-GDT_BASE\r | |
480 | dw 0FFFFh ; limit 0xFFFFF\r | |
481 | dw 0 ; base 0\r | |
482 | db 0\r | |
483 | db 092h ; present, ring 0, data, expand-up, writable\r | |
484 | db 0CFh ; page-granular, 32-bit\r | |
485 | db 0\r | |
486 | \r | |
487 | ; linear code segment descriptor\r | |
488 | LINEAR_CODE_SEL equ $-GDT_BASE\r | |
489 | dw 0FFFFh ; limit 0xFFFFF\r | |
490 | dw 0 ; base 0\r | |
491 | db 0\r | |
492 | db 09Ah ; present, ring 0, data, expand-up, writable\r | |
493 | db 0CFh ; page-granular, 32-bit\r | |
494 | db 0\r | |
495 | \r | |
496 | ; system data segment descriptor\r | |
497 | SYS_DATA_SEL equ $-GDT_BASE\r | |
498 | dw 0FFFFh ; limit 0xFFFFF\r | |
499 | dw 0 ; base 0\r | |
500 | db 0\r | |
501 | db 092h ; present, ring 0, data, expand-up, writable\r | |
502 | db 0CFh ; page-granular, 32-bit\r | |
503 | db 0\r | |
504 | \r | |
505 | ; system code segment descriptor\r | |
506 | SYS_CODE_SEL equ $-GDT_BASE\r | |
507 | dw 0FFFFh ; limit 0xFFFFF\r | |
508 | dw 0 ; base 0\r | |
509 | db 0\r | |
510 | db 09Ah ; present, ring 0, data, expand-up, writable\r | |
511 | db 0CFh ; page-granular, 32-bit\r | |
512 | db 0\r | |
513 | \r | |
514 | ; spare segment descriptor\r | |
515 | SPARE3_SEL equ $-GDT_BASE\r | |
516 | dw 0 ; limit 0xFFFFF\r | |
517 | dw 0 ; base 0\r | |
518 | db 0\r | |
519 | db 0 ; present, ring 0, data, expand-up, writable\r | |
520 | db 0 ; page-granular, 32-bit\r | |
521 | db 0\r | |
522 | \r | |
523 | ; spare segment descriptor\r | |
524 | SPARE4_SEL equ $-GDT_BASE\r | |
525 | dw 0 ; limit 0xFFFFF\r | |
526 | dw 0 ; base 0\r | |
527 | db 0\r | |
528 | db 0 ; present, ring 0, data, expand-up, writable\r | |
529 | db 0 ; page-granular, 32-bit\r | |
530 | db 0\r | |
531 | \r | |
532 | ; spare segment descriptor\r | |
533 | SPARE5_SEL equ $-GDT_BASE\r | |
534 | dw 0 ; limit 0xFFFFF\r | |
535 | dw 0 ; base 0\r | |
536 | db 0\r | |
537 | db 0 ; present, ring 0, data, expand-up, writable\r | |
538 | db 0 ; page-granular, 32-bit\r | |
539 | db 0\r | |
540 | \r | |
541 | GDT_END:\r | |
542 | \r | |
543 | align 02h\r | |
544 | \r | |
545 | \r | |
546 | \r | |
547 | idtr dw IDT_END - IDT_BASE - 1 ; IDT limit\r | |
548 | dd 0 ; (IDT base gets set above)\r | |
549 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
550 | ; interrupt descriptor table (IDT)\r | |
551 | ;\r | |
552 | ; Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r | |
553 | ; mappings. This implementation only uses the system timer and all other\r | |
554 | ; IRQs will remain masked. The descriptors for vectors 33+ are provided\r | |
555 | ; for convenience.\r | |
556 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
557 | \r | |
558 | ;idt_tag db "IDT",0 \r | |
559 | align 02h\r | |
560 | \r | |
561 | public IDT_BASE\r | |
562 | IDT_BASE:\r | |
563 | ; divide by zero (INT 0)\r | |
564 | DIV_ZERO_SEL equ $-IDT_BASE\r | |
565 | dw 0 ; offset 15:0\r | |
566 | dw SYS_CODE_SEL ; selector 15:0\r | |
567 | db 0 ; 0 for interrupt gate\r | |
568 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
569 | dw 0 ; offset 31:16\r | |
570 | \r | |
571 | ; debug exception (INT 1)\r | |
572 | DEBUG_EXCEPT_SEL equ $-IDT_BASE\r | |
573 | dw 0 ; offset 15:0\r | |
574 | dw SYS_CODE_SEL ; selector 15:0\r | |
575 | db 0 ; 0 for interrupt gate\r | |
576 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
577 | dw 0 ; offset 31:16\r | |
578 | \r | |
579 | ; NMI (INT 2)\r | |
580 | NMI_SEL equ $-IDT_BASE\r | |
581 | dw 0 ; offset 15:0\r | |
582 | dw SYS_CODE_SEL ; selector 15:0\r | |
583 | db 0 ; 0 for interrupt gate\r | |
584 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
585 | dw 0 ; offset 31:16\r | |
586 | \r | |
587 | ; soft breakpoint (INT 3)\r | |
588 | BREAKPOINT_SEL equ $-IDT_BASE\r | |
589 | dw 0 ; offset 15:0\r | |
590 | dw SYS_CODE_SEL ; selector 15:0\r | |
591 | db 0 ; 0 for interrupt gate\r | |
592 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
593 | dw 0 ; offset 31:16\r | |
594 | \r | |
595 | ; overflow (INT 4)\r | |
596 | OVERFLOW_SEL equ $-IDT_BASE\r | |
597 | dw 0 ; offset 15:0\r | |
598 | dw SYS_CODE_SEL ; selector 15:0\r | |
599 | db 0 ; 0 for interrupt gate\r | |
600 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
601 | dw 0 ; offset 31:16\r | |
602 | \r | |
603 | ; bounds check (INT 5)\r | |
604 | BOUNDS_CHECK_SEL equ $-IDT_BASE\r | |
605 | dw 0 ; offset 15:0\r | |
606 | dw SYS_CODE_SEL ; selector 15:0\r | |
607 | db 0 ; 0 for interrupt gate\r | |
608 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
609 | dw 0 ; offset 31:16\r | |
610 | \r | |
611 | ; invalid opcode (INT 6)\r | |
612 | INVALID_OPCODE_SEL equ $-IDT_BASE\r | |
613 | dw 0 ; offset 15:0\r | |
614 | dw SYS_CODE_SEL ; selector 15:0\r | |
615 | db 0 ; 0 for interrupt gate\r | |
616 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
617 | dw 0 ; offset 31:16\r | |
618 | \r | |
619 | ; device not available (INT 7)\r | |
620 | DEV_NOT_AVAIL_SEL equ $-IDT_BASE\r | |
621 | dw 0 ; offset 15:0\r | |
622 | dw SYS_CODE_SEL ; selector 15:0\r | |
623 | db 0 ; 0 for interrupt gate\r | |
624 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
625 | dw 0 ; offset 31:16\r | |
626 | \r | |
627 | ; double fault (INT 8)\r | |
628 | DOUBLE_FAULT_SEL equ $-IDT_BASE\r | |
629 | dw 0 ; offset 15:0\r | |
630 | dw SYS_CODE_SEL ; selector 15:0\r | |
631 | db 0 ; 0 for interrupt gate\r | |
632 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
633 | dw 0 ; offset 31:16\r | |
634 | \r | |
635 | ; Coprocessor segment overrun - reserved (INT 9)\r | |
636 | RSVD_INTR_SEL1 equ $-IDT_BASE\r | |
637 | dw 0 ; offset 15:0\r | |
638 | dw SYS_CODE_SEL ; selector 15:0\r | |
639 | db 0 ; 0 for interrupt gate\r | |
640 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
641 | dw 0 ; offset 31:16\r | |
642 | \r | |
643 | ; invalid TSS (INT 0ah)\r | |
644 | INVALID_TSS_SEL equ $-IDT_BASE\r | |
645 | dw 0 ; offset 15:0\r | |
646 | dw SYS_CODE_SEL ; selector 15:0\r | |
647 | db 0 ; 0 for interrupt gate\r | |
648 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
649 | dw 0 ; offset 31:16\r | |
650 | \r | |
651 | ; segment not present (INT 0bh)\r | |
652 | SEG_NOT_PRESENT_SEL equ $-IDT_BASE\r | |
653 | dw 0 ; offset 15:0\r | |
654 | dw SYS_CODE_SEL ; selector 15:0\r | |
655 | db 0 ; 0 for interrupt gate\r | |
656 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
657 | dw 0 ; offset 31:16\r | |
658 | \r | |
659 | ; stack fault (INT 0ch)\r | |
660 | STACK_FAULT_SEL equ $-IDT_BASE\r | |
661 | dw 0 ; offset 15:0\r | |
662 | dw SYS_CODE_SEL ; selector 15:0\r | |
663 | db 0 ; 0 for interrupt gate\r | |
664 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
665 | dw 0 ; offset 31:16\r | |
666 | \r | |
667 | ; general protection (INT 0dh)\r | |
668 | GP_FAULT_SEL equ $-IDT_BASE\r | |
669 | dw 0 ; offset 15:0\r | |
670 | dw SYS_CODE_SEL ; selector 15:0\r | |
671 | db 0 ; 0 for interrupt gate\r | |
672 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
673 | dw 0 ; offset 31:16\r | |
674 | \r | |
675 | ; page fault (INT 0eh)\r | |
676 | PAGE_FAULT_SEL equ $-IDT_BASE\r | |
677 | dw 0 ; offset 15:0\r | |
678 | dw SYS_CODE_SEL ; selector 15:0\r | |
679 | db 0 ; 0 for interrupt gate\r | |
680 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
681 | dw 0 ; offset 31:16\r | |
682 | \r | |
683 | ; Intel reserved - do not use (INT 0fh)\r | |
684 | RSVD_INTR_SEL2 equ $-IDT_BASE\r | |
685 | dw 0 ; offset 15:0\r | |
686 | dw SYS_CODE_SEL ; selector 15:0\r | |
687 | db 0 ; 0 for interrupt gate\r | |
688 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
689 | dw 0 ; offset 31:16\r | |
690 | \r | |
691 | ; floating point error (INT 10h)\r | |
692 | FLT_POINT_ERR_SEL equ $-IDT_BASE\r | |
693 | dw 0 ; offset 15:0\r | |
694 | dw SYS_CODE_SEL ; selector 15:0\r | |
695 | db 0 ; 0 for interrupt gate\r | |
696 | db 0eh OR 80h ; type = 386 interrupt gate, present\r | |
697 | dw 0 ; offset 31:16\r | |
698 | \r | |
699 | ; alignment check (INT 11h)\r | |
700 | ALIGNMENT_CHECK_SEL equ $-IDT_BASE\r | |
701 | dw 0 ; offset 15:0\r | |
702 | dw SYS_CODE_SEL ; selector 15:0\r | |
703 | db 0 ; 0 for interrupt gate\r | |
704 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
705 | dw 0 ; offset 31:16\r | |
706 | \r | |
707 | ; machine check (INT 12h)\r | |
708 | MACHINE_CHECK_SEL equ $-IDT_BASE\r | |
709 | dw 0 ; offset 15:0\r | |
710 | dw SYS_CODE_SEL ; selector 15:0\r | |
711 | db 0 ; 0 for interrupt gate\r | |
712 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
713 | dw 0 ; offset 31:16\r | |
714 | \r | |
715 | ; SIMD floating-point exception (INT 13h)\r | |
716 | SIMD_EXCEPTION_SEL equ $-IDT_BASE\r | |
717 | dw 0 ; offset 15:0\r | |
718 | dw SYS_CODE_SEL ; selector 15:0\r | |
719 | db 0 ; 0 for interrupt gate\r | |
720 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
721 | dw 0 ; offset 31:16\r | |
722 | \r | |
723 | ; 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r | |
724 | db (85 * 8) dup(0)\r | |
725 | \r | |
726 | ; IRQ 0 (System timer) - (INT 68h)\r | |
727 | IRQ0_SEL equ $-IDT_BASE\r | |
728 | dw 0 ; offset 15:0\r | |
729 | dw SYS_CODE_SEL ; selector 15:0\r | |
730 | db 0 ; 0 for interrupt gate\r | |
731 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
732 | dw 0 ; offset 31:16\r | |
733 | \r | |
734 | ; IRQ 1 (8042 Keyboard controller) - (INT 69h)\r | |
735 | IRQ1_SEL equ $-IDT_BASE\r | |
736 | dw 0 ; offset 15:0\r | |
737 | dw SYS_CODE_SEL ; selector 15:0\r | |
738 | db 0 ; 0 for interrupt gate\r | |
739 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
740 | dw 0 ; offset 31:16\r | |
741 | \r | |
742 | ; Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r | |
743 | IRQ2_SEL equ $-IDT_BASE\r | |
744 | dw 0 ; offset 15:0\r | |
745 | dw SYS_CODE_SEL ; selector 15:0\r | |
746 | db 0 ; 0 for interrupt gate\r | |
747 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
748 | dw 0 ; offset 31:16\r | |
749 | \r | |
750 | ; IRQ 3 (COM 2) - (INT 6bh)\r | |
751 | IRQ3_SEL equ $-IDT_BASE\r | |
752 | dw 0 ; offset 15:0\r | |
753 | dw SYS_CODE_SEL ; selector 15:0\r | |
754 | db 0 ; 0 for interrupt gate\r | |
755 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
756 | dw 0 ; offset 31:16\r | |
757 | \r | |
758 | ; IRQ 4 (COM 1) - (INT 6ch)\r | |
759 | IRQ4_SEL equ $-IDT_BASE\r | |
760 | dw 0 ; offset 15:0\r | |
761 | dw SYS_CODE_SEL ; selector 15:0\r | |
762 | db 0 ; 0 for interrupt gate\r | |
763 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
764 | dw 0 ; offset 31:16\r | |
765 | \r | |
766 | ; IRQ 5 (LPT 2) - (INT 6dh)\r | |
767 | IRQ5_SEL equ $-IDT_BASE\r | |
768 | dw 0 ; offset 15:0\r | |
769 | dw SYS_CODE_SEL ; selector 15:0\r | |
770 | db 0 ; 0 for interrupt gate\r | |
771 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
772 | dw 0 ; offset 31:16\r | |
773 | \r | |
774 | ; IRQ 6 (Floppy controller) - (INT 6eh)\r | |
775 | IRQ6_SEL equ $-IDT_BASE\r | |
776 | dw 0 ; offset 15:0\r | |
777 | dw SYS_CODE_SEL ; selector 15:0\r | |
778 | db 0 ; 0 for interrupt gate\r | |
779 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
780 | dw 0 ; offset 31:16\r | |
781 | \r | |
782 | ; IRQ 7 (LPT 1) - (INT 6fh)\r | |
783 | IRQ7_SEL equ $-IDT_BASE\r | |
784 | dw 0 ; offset 15:0\r | |
785 | dw SYS_CODE_SEL ; selector 15:0\r | |
786 | db 0 ; 0 for interrupt gate\r | |
787 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
788 | dw 0 ; offset 31:16\r | |
789 | \r | |
790 | ; IRQ 8 (RTC Alarm) - (INT 70h)\r | |
791 | IRQ8_SEL equ $-IDT_BASE\r | |
792 | dw 0 ; offset 15:0\r | |
793 | dw SYS_CODE_SEL ; selector 15:0\r | |
794 | db 0 ; 0 for interrupt gate\r | |
795 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
796 | dw 0 ; offset 31:16\r | |
797 | \r | |
798 | ; IRQ 9 - (INT 71h)\r | |
799 | IRQ9_SEL equ $-IDT_BASE\r | |
800 | dw 0 ; offset 15:0\r | |
801 | dw SYS_CODE_SEL ; selector 15:0\r | |
802 | db 0 ; 0 for interrupt gate\r | |
803 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
804 | dw 0 ; offset 31:16\r | |
805 | \r | |
806 | ; IRQ 10 - (INT 72h)\r | |
807 | IRQ10_SEL equ $-IDT_BASE\r | |
808 | dw 0 ; offset 15:0\r | |
809 | dw SYS_CODE_SEL ; selector 15:0\r | |
810 | db 0 ; 0 for interrupt gate\r | |
811 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
812 | dw 0 ; offset 31:16\r | |
813 | \r | |
814 | ; IRQ 11 - (INT 73h)\r | |
815 | IRQ11_SEL equ $-IDT_BASE\r | |
816 | dw 0 ; offset 15:0\r | |
817 | dw SYS_CODE_SEL ; selector 15:0\r | |
818 | db 0 ; 0 for interrupt gate\r | |
819 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
820 | dw 0 ; offset 31:16\r | |
821 | \r | |
822 | ; IRQ 12 (PS/2 mouse) - (INT 74h)\r | |
823 | IRQ12_SEL equ $-IDT_BASE\r | |
824 | dw 0 ; offset 15:0\r | |
825 | dw SYS_CODE_SEL ; selector 15:0\r | |
826 | db 0 ; 0 for interrupt gate\r | |
827 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
828 | dw 0 ; offset 31:16\r | |
829 | \r | |
830 | ; IRQ 13 (Floating point error) - (INT 75h)\r | |
831 | IRQ13_SEL equ $-IDT_BASE\r | |
832 | dw 0 ; offset 15:0\r | |
833 | dw SYS_CODE_SEL ; selector 15:0\r | |
834 | db 0 ; 0 for interrupt gate\r | |
835 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
836 | dw 0 ; offset 31:16\r | |
837 | \r | |
838 | ; IRQ 14 (Secondary IDE) - (INT 76h)\r | |
839 | IRQ14_SEL equ $-IDT_BASE\r | |
840 | dw 0 ; offset 15:0\r | |
841 | dw SYS_CODE_SEL ; selector 15:0\r | |
842 | db 0 ; 0 for interrupt gate\r | |
843 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
844 | dw 0 ; offset 31:16\r | |
845 | \r | |
846 | ; IRQ 15 (Primary IDE) - (INT 77h)\r | |
847 | IRQ15_SEL equ $-IDT_BASE\r | |
848 | dw 0 ; offset 15:0\r | |
849 | dw SYS_CODE_SEL ; selector 15:0\r | |
850 | db 0 ; 0 for interrupt gate\r | |
851 | db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present\r | |
852 | dw 0 ; offset 31:16\r | |
853 | \r | |
854 | IDT_END:\r | |
855 | \r | |
856 | align 02h\r | |
857 | \r | |
858 | MemoryMapSize dd 0\r | |
859 | MemoryMap dd 0,0,0,0,0,0,0,0\r | |
860 | dd 0,0,0,0,0,0,0,0\r | |
861 | dd 0,0,0,0,0,0,0,0\r | |
862 | dd 0,0,0,0,0,0,0,0\r | |
863 | dd 0,0,0,0,0,0,0,0\r | |
864 | dd 0,0,0,0,0,0,0,0\r | |
865 | dd 0,0,0,0,0,0,0,0\r | |
866 | dd 0,0,0,0,0,0,0,0\r | |
867 | dd 0,0,0,0,0,0,0,0\r | |
868 | dd 0,0,0,0,0,0,0,0\r | |
869 | dd 0,0,0,0,0,0,0,0\r | |
870 | dd 0,0,0,0,0,0,0,0\r | |
871 | dd 0,0,0,0,0,0,0,0\r | |
872 | dd 0,0,0,0,0,0,0,0\r | |
873 | dd 0,0,0,0,0,0,0,0\r | |
874 | dd 0,0,0,0,0,0,0,0\r | |
875 | dd 0,0,0,0,0,0,0,0\r | |
876 | dd 0,0,0,0,0,0,0,0\r | |
877 | dd 0,0,0,0,0,0,0,0\r | |
878 | dd 0,0,0,0,0,0,0,0\r | |
879 | dd 0,0,0,0,0,0,0,0\r | |
880 | dd 0,0,0,0,0,0,0,0\r | |
881 | dd 0,0,0,0,0,0,0,0\r | |
882 | dd 0,0,0,0,0,0,0,0\r | |
883 | dd 0,0,0,0,0,0,0,0\r | |
884 | dd 0,0,0,0,0,0,0,0\r | |
885 | dd 0,0,0,0,0,0,0,0\r | |
886 | dd 0,0,0,0,0,0,0,0\r | |
887 | dd 0,0,0,0,0,0,0,0\r | |
888 | dd 0,0,0,0,0,0,0,0\r | |
889 | \r | |
890 | dd 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r | |
891 | dd 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r | |
892 | \r | |
893 | org 0fe0h\r | |
894 | MyStack: \r | |
895 | ; below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r | |
896 | ; back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r | |
897 | ; known low address (20f00) so it can be set up by PlMapIrqToVect in\r | |
898 | ; 8259.c\r | |
899 | \r | |
900 | int 8\r | |
901 | iret\r | |
902 | \r | |
903 | int 9\r | |
904 | iret\r | |
905 | \r | |
906 | int 10\r | |
907 | iret\r | |
908 | \r | |
909 | int 11\r | |
910 | iret\r | |
911 | \r | |
912 | int 12\r | |
913 | iret\r | |
914 | \r | |
915 | int 13\r | |
916 | iret\r | |
917 | \r | |
918 | int 14\r | |
919 | iret\r | |
920 | \r | |
921 | int 15\r | |
922 | iret\r | |
923 | \r | |
924 | \r | |
925 | org 0ffeh\r | |
926 | BlockSignature:\r | |
927 | dw 0aa55h\r | |
928 | \r | |
929 | end \r |