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[PATCH v3 02/16] IntelFsp2Pkg/BaseFspCommonLib: Remove unused PCDs
[mirror_edk2.git] / DuetPkg / BootSector / start64.S
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1#------------------------------------------------------------------------------\r
2#*\r
3#* Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
4#* This program and the accompanying materials \r
5#* are licensed and made available under the terms and conditions of the BSD License \r
6#* which accompanies this distribution. The full text of the license may be found at \r
7#* http://opensource.org/licenses/bsd-license.php \r
8#* \r
9#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
10#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
11#* \r
12#* start64.asm\r
13#* \r
14#* Abstract:\r
15#*\r
16#------------------------------------------------------------------------------\r
17\r
18\r
19 .stack: \r
20 .486p: \r
21 .code16\r
22\r
23.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020\r
24.equ FAT_DIRECTORY_ENTRY_SHIFT, 5\r
25.equ BLOCK_SIZE, 0x0200\r
26.equ BLOCK_MASK, 0x01ff\r
27.equ BLOCK_SHIFT, 9\r
28\r
29 .org 0x0\r
30\r
31.global _start\r
32_start:\r
33\r
34Ia32Jump: \r
35 jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
36 nop\r
37\r
38OemId: .ascii "INTEL " # OemId - 8 bytes\r
39\r
40SectorSize: .word 0 # Sector Size - 16 bits\r
41SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits\r
42ReservedSectors: .word 0 # Reserved Sectors - 16 bits\r
43NoFats: .byte 0 # Number of FATs - 8 bits\r
44RootEntries: .word 0 # Root Entries - 16 bits\r
45Sectors: .word 0 # Number of Sectors - 16 bits\r
46Media: .byte 0 # Media - 8 bits - ignored\r
47SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits\r
48SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored\r
49Heads: .word 0 # Heads - 16 bits - ignored\r
50HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored\r
51LargeSectors: .long 0 # Large Sectors - 32 bits \r
52PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored\r
53CurrentHead: .byte 0 # Current Head - 8 bits\r
54Signature: .byte 0 # Signature - 8 bits - ignored\r
55VolId: .ascii " " # Volume Serial Number- 4 bytes\r
56FatLabel: .ascii " " # Label - 11 bytes\r
57SystemId: .ascii "FAT12 " # SystemId - 8 bytes\r
58\r
59BootSectorEntryPoint: \r
60 # ASSUME ds:@code"\r
61 # ASSUME ss:@code"\r
62 # ds = 1000, es = 2000 + x (size of first cluster >> 4)\r
63 # cx = Start Cluster of EfiLdr\r
64 # dx = Start Cluster of Efivar.bin\r
65\r
66# Re use the BPB data stored in Boot Sector\r
67 movw $0x7c00,%bp\r
68\r
69 pushw %cx\r
70# Read Efivar.bin\r
71# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r
72 movw $0x1900,%ax\r
73 movw %ax,%es\r
74 testw %dx,%dx\r
75 jnz CheckVarStoreSize\r
76\r
77 movb $1,%al\r
78NoVarStore: \r
79 pushw %es\r
80# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r
81 movb %al, %es:(4)\r
82 jmp SaveVolumeId\r
83\r
84CheckVarStoreSize: \r
85 movw %dx,%di\r
86 cmpl $0x4000, %ds:2(%di)\r
87 movb $2,%al\r
88 jne NoVarStore\r
89\r
90LoadVarStore: \r
91 movb $0,%al\r
92 movb %al, %es:(4)\r
93 movw (%di), %cx\r
94# ES:DI = 1500:0\r
95 xorw %di,%di\r
96 pushw %es\r
97 movw $0x1500,%ax\r
98 movw %ax,%es\r
99 call ReadFile\r
100SaveVolumeId: \r
101 popw %es\r
102 movw VolId(%bp), %ax\r
103 movw %ax, %es:(0) \r
104 movw VolId+2(%bp), %ax\r
105 movw %ax, %es:(2)\r
106\r
107# Read Efildr\r
108 popw %cx\r
109# cx = Start Cluster of Efildr -> BS.com has filled already\r
110# ES:DI = 2000:0, first cluster will be read again\r
111 xorw %di,%di # di = 0\r
112 movw $0x2000,%ax\r
113 movw %ax,%es\r
114 call ReadFile\r
115 movw %cs,%ax\r
116 movw %ax, %cs:JumpSegment\r
117\r
118CheckEm64T: \r
119 movl $0x80000001,%eax\r
120# cpuid\r
121 .word 0xA20F\r
122 btl $29,%edx\r
123 jc CheckEm64TPass\r
124 pushw %cs\r
125 popw %ds\r
126 leaw Em64String,%si\r
127 movw $18,%cx\r
128 jmp PrintStringAndHalt\r
129CheckEm64TPass: \r
130JumpFarInstruction: \r
131 .byte 0xea\r
132JumpOffset: \r
133 .word 0x200\r
134JumpSegment: \r
135 .word 0x2000\r
136\r
137\r
138\r
139# ****************************************************************************\r
140# ReadFile\r
141#\r
142# Arguments:\r
143# CX = Start Cluster of File\r
144# ES:DI = Buffer to store file content read from disk\r
145#\r
146# Return:\r
147# (ES << 4 + DI) = end of file content Buffer\r
148#\r
149# ****************************************************************************\r
150ReadFile: \r
151# si = NumberOfClusters\r
152# cx = ClusterNumber\r
153# dx = CachedFatSectorNumber\r
154# ds:0000 = CacheFatSectorBuffer\r
155# es:di = Buffer to load file\r
156# bx = NextClusterNumber\r
157 pusha\r
158 movw $1,%si # NumberOfClusters = 1\r
159 pushw %cx # Push Start Cluster onto stack\r
160 movw $0xfff,%dx # CachedFatSectorNumber = 0xfff\r
161FatChainLoop: \r
162 movw %cx,%ax # ax = ClusterNumber \r
163 andw $0xff8,%ax # ax = ax & 0xff8\r
164 cmpw $0xff8,%ax # See if this is the last cluster\r
165 je FoundLastCluster # Jump if last cluster found\r
166 movw %cx,%ax # ax = ClusterNumber\r
167 shlw %ax # ax = ClusterNumber * 2\r
168 addw %cx,%ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3\r
169 shrw %ax # FatOffset = ClusterNumber*3 / 2\r
170 pushw %si # Save si\r
171 movw %ax,%si # si = FatOffset\r
172 shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT\r
173 addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r
174 andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK\r
175 cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber\r
176 je SkipFatRead\r
177 movw $2,%bx\r
178 pushw %es\r
179 pushw %ds\r
180 popw %es\r
181 call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI\r
182 popw %es\r
183 movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber\r
184SkipFatRead: \r
185 movw (%si), %bx # bx = NextClusterNumber\r
186 movw %cx,%ax # ax = ClusterNumber\r
187 andw $1,%ax # See if this is an odd cluster number\r
188 je EvenFatEntry\r
189 shrw $4,%bx # NextClusterNumber = NextClusterNumber >> 4\r
190EvenFatEntry: \r
191 andw $0xfff,%bx # Strip upper 4 bits of NextClusterNumber\r
192 popw %si # Restore si\r
193 decw %bx # bx = NextClusterNumber - 1\r
194 cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber\r
195 jne ReadClusters\r
196 incw %bx # bx = NextClusterNumber\r
197 incw %si # NumberOfClusters++\r
198 movw %bx,%cx # ClusterNumber = NextClusterNumber\r
199 jmp FatChainLoop\r
200ReadClusters: \r
201 incw %bx\r
202 popw %ax # ax = StartCluster\r
203 pushw %bx # StartCluster = NextClusterNumber\r
204 movw %bx,%cx # ClusterNumber = NextClusterNumber\r
205 subw $2,%ax # ax = StartCluster - 2\r
206 xorb %bh,%bh\r
207 movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r
208 mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster\r
209 addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r
210 pushw %ax # save start sector\r
211 movw %si,%ax # ax = NumberOfClusters\r
212 mulw %bx # ax = NumberOfClusters * SectorsPerCluster\r
213 movw %ax,%bx # bx = Number of Sectors\r
214 popw %ax # ax = Start Sector\r
215 call ReadBlocks\r
216 movw $1,%si # NumberOfClusters = 1\r
217 jmp FatChainLoop\r
218FoundLastCluster: \r
219 popw %cx\r
220 popa\r
221 ret\r
222\r
223\r
224# ****************************************************************************\r
225# ReadBlocks - Reads a set of blocks from a block device\r
226#\r
227# AX = Start LBA\r
228# BX = Number of Blocks to Read\r
229# ES:DI = Buffer to store sectors read from disk\r
230# ****************************************************************************\r
231\r
232# cx = Blocks\r
233# bx = NumberOfBlocks\r
234# si = StartLBA\r
235\r
236ReadBlocks: \r
237 pusha\r
238 addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA\r
239 addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA\r
240 movl %eax,%esi # esi = Start LBA\r
241 movw %bx,%cx # cx = Number of blocks to read\r
242ReadCylinderLoop: \r
243 movw $0x7bfc,%bp # bp = 0x7bfc\r
244 movl %esi,%eax # eax = Start LBA\r
245 xorl %edx,%edx # edx = 0\r
246 movzwl (%bp), %ebx # bx = MaxSector\r
247 divl %ebx # ax = StartLBA / MaxSector\r
248 incw %dx # dx = (StartLBA % MaxSector) + 1\r
249\r
250 movw (%bp), %bx # bx = MaxSector\r
251 subw %dx,%bx # bx = MaxSector - Sector\r
252 incw %bx # bx = MaxSector - Sector + 1\r
253 cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)\r
254 jg LimitTransfer\r
255 movw %cx,%bx # bx = Blocks\r
256LimitTransfer: \r
257 pushw %ax # save ax\r
258 movw %es,%ax # ax = es\r
259 shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system\r
260 andw $0x7f,%ax # ax = Number of blocks into current seg\r
261 addw %bx,%ax # ax = End Block number of transfer\r
262 cmpw $0x80,%ax # See if it crosses a 64K boundry\r
263 jle NotCrossing64KBoundry # Branch if not crossing 64K boundry\r
264 subw $0x80,%ax # ax = Number of blocks past 64K boundry\r
265 subw %ax,%bx # Decrease transfer size by block overage\r
266NotCrossing64KBoundry: \r
267 popw %ax # restore ax\r
268\r
269 pushw %cx\r
270 movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector\r
271 xorw %dx,%dx # dx = 0\r
272 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder \r
273 # dx = ax % (MaxHead + 1) = Head\r
274\r
275 pushw %bx # Save number of blocks to transfer\r
276 movb %dl,%dh # dh = Head\r
277 movw $0x7c00,%bp # bp = 0x7c00\r
278 movb PhysicalDrive(%bp), %dl # dl = Drive Number\r
279 movb %al,%ch # ch = Cylinder\r
280 movb %bl,%al # al = Blocks\r
281 movb $2,%ah # ah = Function 2\r
282 movw %di,%bx # es:bx = Buffer address\r
283 int $0x13\r
284 jc DiskError\r
285 popw %bx\r
286 popw %cx\r
287 movzwl %bx,%ebx\r
288 addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks\r
289 subw %bx,%cx # Blocks = Blocks - NumberOfBlocks\r
290 movw %es,%ax\r
291 shlw $(BLOCK_SHIFT-4), %bx\r
292 addw %bx,%ax\r
293 movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r
294 cmpw $0,%cx\r
295 jne ReadCylinderLoop\r
296 popa\r
297 ret\r
298\r
299DiskError: \r
300 pushw %cs\r
301 popw %ds\r
302 leaw ErrorString,%si\r
303 movw $7,%cx\r
304 jmp PrintStringAndHalt\r
305\r
306PrintStringAndHalt: \r
307 movw $0xb800,%ax\r
308 movw %ax,%es\r
309 movw $160,%di\r
310 rep \r
311 movsw \r
312Halt: \r
313 jmp Halt\r
314\r
315ErrorString: \r
316 .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c\r
317\r
318 .org 0x01fa\r
319LBAOffsetForBootSector: \r
320 .long 0x0\r
321\r
322 .org 0x01fe\r
323 .word 0xaa55\r
324\r
325#******************************************************************************\r
326#******************************************************************************\r
327#******************************************************************************\r
328\r
329.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay\r
330.equ KBD_CONTROL_PORT, 0x060 # 8042 control port \r
331.equ KBD_STATUS_PORT, 0x064 # 8042 status port \r
332.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port\r
333.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20\r
334\r
335 .org 0x200\r
336 jmp start\r
337Em64String: \r
338.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
339\r
340start: \r
341 movw %cs,%ax\r
342 movw %ax,%ds\r
343 movw %ax,%es\r
344 movw %ax,%ss\r
345 movw $MyStack, %sp\r
346\r
347# mov ax,0b800h\r
348# mov es,ax\r
349# mov byte ptr es:[160],'a'\r
350# mov ax,cs\r
351# mov es,ax\r
352\r
353 movl $0,%ebx\r
354 leal MemoryMap, %edi\r
355MemMapLoop: \r
356 movl $0xe820,%eax\r
357 movl $20,%ecx\r
358 movl $0x534d4150, %edx # SMAP\r
359 int $0x15\r
360 jc MemMapDone\r
361 addl $20,%edi\r
362 cmpl $0,%ebx\r
363 je MemMapDone\r
364 jmp MemMapLoop\r
365MemMapDone: \r
366 leal MemoryMap, %eax\r
367 subl %eax,%edi # Get the address of the memory map\r
368 movl %edi, MemoryMapSize # Save the size of the memory map\r
369\r
370 xorl %ebx,%ebx\r
371 movw %cs,%bx # BX=segment\r
372 shll $4,%ebx # BX="linear" address of segment base\r
373 leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt\r
374 movl %eax, (gdtr + 2) # Put address of gdt into the gdtr\r
375 leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt\r
376 movl %eax, (idtr + 2) # Put address of idt into the idtr\r
377 leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map\r
378\r
379# mov ax,0b800h\r
380# mov es,ax\r
381# mov byte ptr es:[162],'b'\r
382# mov ax,cs\r
383# mov es,ax\r
384\r
385#\r
386# Enable A20 Gate \r
387#\r
388\r
389 movw $0x2401,%ax # Enable A20 Gate\r
390 int $0x15\r
391 jnc A20GateEnabled # Jump if it suceeded\r
392\r
393#\r
394# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r
395#\r
396\r
397 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
398 jnz Timeout8042 # Jump if the 8042 timed out\r
399 outw %ax, $DELAY_PORT # Delay 1 uS\r
400 movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r
401 outb %al, $KBD_STATUS_PORT # Send command to the 8042\r
402 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
403 jnz Timeout8042 # Jump if the 8042 timed out\r
404 movb $ENABLE_A20_CMD, %al # gate address bit 20 on\r
405 outb %al, $KBD_CONTROL_PORT # Send command to thre 8042\r
406 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
407 movw $25,%cx # Delay 25 uS for the command to complete on the 8042\r
408Delay25uS: \r
409 outw %ax, $DELAY_PORT # Delay 1 uS\r
410 loop Delay25uS\r
411Timeout8042: \r
412\r
413\r
414A20GateEnabled: \r
415\r
416#\r
417# DISABLE INTERRUPTS - Entering Protected Mode\r
418#\r
419\r
420 cli\r
421\r
422# mov ax,0b800h\r
423# mov es,ax\r
424# mov byte ptr es:[164],'c'\r
425# mov ax,cs\r
426# mov es,ax\r
427\r
428 leal OffsetIn32BitProtectedMode, %eax\r
429 addl $0x20000+0x6,%eax\r
430 movl %eax, OffsetIn32BitProtectedMode \r
431\r
432 leal OffsetInLongMode, %eax\r
433 addl $0x20000+0x6,%eax\r
434 movl %eax, OffsetInLongMode \r
435\r
436 #\r
437 # load GDT\r
438 #\r
439 .byte 0x66\r
440 lgdt gdtr\r
441\r
442 #\r
443 # Enable Protect Mode (set CR0.PE=1)\r
444 #\r
445 movl %cr0, %eax # Read CR0.\r
446 orl $0x1,%eax # Set PE=1\r
447 movl %eax, %cr0 # Write CR0.\r
448 .byte 0x66\r
449 .byte 0xea # jmp far 16:32\r
450OffsetIn32BitProtectedMode: \r
451 .long 0x0000000 # offset $+8 (In32BitProtectedMode)\r
452 .word 0x10 # selector (flat CS)\r
453In32BitProtectedMode: \r
454\r
455#\r
456# Entering Long Mode\r
457#\r
458 .byte 0x66\r
459 movw $8,%ax\r
460 movw %ax,%ds\r
461 movw %ax,%es\r
462 movw %ax,%ss\r
463\r
464 #\r
465 # Enable the 64-bit page-translation-table entries by\r
466 # setting CR4.PAE=1 (this is _required_ before activating\r
467 # long mode). Paging is not enabled until after long mode\r
468 # is enabled.\r
469 #\r
470 .byte 0xf\r
471 .byte 0x20\r
472 .byte 0xe0\r
473# mov eax, cr4\r
474 btsl $5,%eax\r
475 .byte 0xf\r
476 .byte 0x22\r
477 .byte 0xe0\r
478# mov cr4, eax\r
479\r
480 #\r
481 # This is the Trapolean Page Tables that are guarenteed\r
482 # under 4GB.\r
483 #\r
484 # Address Map:\r
485 # 10000 ~ 12000 - efildr (loaded)\r
486 # 20000 ~ 21000 - start64.com\r
487 # 21000 ~ 22000 - efi64.com\r
488 # 22000 ~ 90000 - efildr\r
489 # 90000 ~ 96000 - 4G pagetable (will be reload later)\r
490 #\r
491 .byte 0xb8\r
492 .long 0x90000\r
493# mov eax, 90000h\r
494 movl %eax, %cr3\r
495\r
496 #\r
497 # Enable long mode (set EFER.LME=1).\r
498 #\r
499 .byte 0xb9\r
500 .long 0xc0000080\r
501# mov ecx, 0c0000080h ; EFER MSR number.\r
502 .byte 0xf\r
503 .byte 0x32\r
504# rdmsr ; Read EFER.\r
505 .byte 0xf\r
506 .byte 0xba\r
507 .byte 0xe8\r
508 .byte 0x8\r
509# bts eax, 8 ; Set LME=1.\r
510 .byte 0xf\r
511 .byte 0x30\r
512# wrmsr ; Write EFER.\r
513\r
514 #\r
515 # Enable paging to activate long mode (set CR0.PG=1)\r
516 #\r
517 movl %cr0, %eax # Read CR0.\r
518 .byte 0xf\r
519 .byte 0xba\r
520 .byte 0xe8\r
521 .byte 0x1f\r
522# bts eax, 31 ; Set PG=1.\r
523 movl %eax, %cr0 # Write CR0.\r
524 jmp GoToLongMode\r
525GoToLongMode: \r
526\r
527 .byte 0x67\r
528 .byte 0xea # Far Jump $+9:Selector to reload CS\r
529OffsetInLongMode: \r
530 .long 00000000 # $+9 Offset is ensuing instruction boundary\r
531 .word 0x38 # Selector is our code selector, 38h\r
532\r
533InLongMode: \r
534 .byte 0x66\r
535 movw $0x30,%ax\r
536 movw %ax,%ds\r
537\r
538 .byte 0x66\r
539 movw $0x18,%ax\r
540 movw %ax,%es\r
541 movw %ax,%ss\r
542 movw %ax,%ds\r
543\r
544 .byte 0xbd\r
545 .long 0x400000\r
546# mov ebp,000400000h ; Destination of EFILDR32\r
547 .byte 0xbb\r
548 .long 0x70000\r
549# mov ebx,000070000h ; Length of copy\r
550\r
551 #\r
552 # load idt later\r
553 #\r
554 .byte 0x48\r
555 .byte 0x33\r
556 .byte 0xc0\r
557# xor rax, rax\r
558 .byte 0x66\r
559 movw $idtr, %ax\r
560 .byte 0x48\r
561 .byte 0x5\r
562 .long 0x20000\r
563# add rax, 20000h\r
564\r
565 .byte 0xf\r
566 .byte 0x1\r
567 .byte 0x18\r
568# lidt fword ptr [rax]\r
569\r
570 .byte 0x48\r
571 .byte 0xc7\r
572 .byte 0xc0\r
573 .long 0x21000\r
574# mov rax, 21000h\r
575 .byte 0x50\r
576# push rax\r
577\r
578# ret\r
579 .byte 0xc3\r
580\r
581Empty8042InputBuffer: \r
582 movw $0,%cx\r
583Empty8042Loop: \r
584 outw %ax, $DELAY_PORT # Delay 1us\r
585 inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r
586 andb $0x2,%al # Check the Input Buffer Full Flag\r
587 loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r
588 ret\r
589\r
590##############################################################################\r
591# data\r
592##############################################################################\r
593\r
594 .p2align 1\r
595\r
596 gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r
597 .long 0 # (GDT base gets set above)\r
598##############################################################################\r
599# global descriptor table (GDT)\r
600##############################################################################\r
601\r
602 .p2align 1\r
603\r
604GDT_BASE: \r
605# null descriptor\r
606.equ NULL_SEL, .-GDT_BASE # Selector [0x0]\r
607 .word 0 # limit 15:0\r
608 .word 0 # base 15:0\r
609 .byte 0 # base 23:16\r
610 .byte 0 # type\r
611 .byte 0 # limit 19:16, flags\r
612 .byte 0 # base 31:24\r
613\r
614# linear data segment descriptor\r
615.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]\r
616 .word 0xFFFF # limit 0xFFFFF\r
617 .word 0 # base 0\r
618 .byte 0\r
619 .byte 0x92 # present, ring 0, data, expand-up, writable\r
620 .byte 0xCF # page-granular, 32-bit\r
621 .byte 0\r
622\r
623# linear code segment descriptor\r
624.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]\r
625 .word 0xFFFF # limit 0xFFFFF\r
626 .word 0 # base 0\r
627 .byte 0\r
628 .byte 0x9A # present, ring 0, data, expand-up, writable\r
629 .byte 0xCF # page-granular, 32-bit\r
630 .byte 0\r
631\r
632# system data segment descriptor\r
633.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]\r
634 .word 0xFFFF # limit 0xFFFFF\r
635 .word 0 # base 0\r
636 .byte 0\r
637 .byte 0x92 # present, ring 0, data, expand-up, writable\r
638 .byte 0xCF # page-granular, 32-bit\r
639 .byte 0\r
640\r
641# system code segment descriptor\r
642.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]\r
643 .word 0xFFFF # limit 0xFFFFF\r
644 .word 0 # base 0\r
645 .byte 0\r
646 .byte 0x9A # present, ring 0, data, expand-up, writable\r
647 .byte 0xCF # page-granular, 32-bit\r
648 .byte 0\r
649\r
650# spare segment descriptor\r
651.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]\r
652 .word 0 # limit 0xFFFFF\r
653 .word 0 # base 0\r
654 .byte 0\r
655 .byte 0 # present, ring 0, data, expand-up, writable\r
656 .byte 0 # page-granular, 32-bit\r
657 .byte 0\r
658\r
659#\r
660# system data segment descriptor\r
661#\r
662.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]\r
663 .word 0xFFFF # limit 0xFFFFF\r
664 .word 0 # base 0\r
665 .byte 0\r
666 .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A\r
667 .byte 0xCF # G | D | L | AVL | Segment [19..16]\r
668 .byte 0\r
669\r
670#\r
671# system code segment descriptor\r
672#\r
673.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]\r
674 .word 0xFFFF # limit 0xFFFFF\r
675 .word 0 # base 0\r
676 .byte 0\r
677 .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A\r
678 .byte 0xAF # G | D | L | AVL | Segment [19..16]\r
679 .byte 0\r
680\r
681# spare segment descriptor\r
682.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]\r
683 .word 0 # limit 0xFFFFF\r
684 .word 0 # base 0\r
685 .byte 0\r
686 .byte 0 # present, ring 0, data, expand-up, writable\r
687 .byte 0 # page-granular, 32-bit\r
688 .byte 0\r
689\r
690GDT_END: \r
691\r
692 .p2align 1\r
693\r
694\r
695\r
696idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r
697 .quad 0 # (IDT base gets set above)\r
698\r
699##############################################################################\r
700# interrupt descriptor table (IDT)\r
701#\r
702# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r
703# mappings. This implementation only uses the system timer and all other\r
704# IRQs will remain masked. The descriptors for vectors 33+ are provided\r
705# for convenience.\r
706##############################################################################\r
707\r
708#idt_tag db "IDT",0 \r
709 .p2align 1\r
710\r
711\r
712IDT_BASE: \r
713# divide by zero (INT 0)\r
714.equ DIV_ZERO_SEL, .-IDT_BASE\r
715 .word 0 # offset 15:0\r
716 .long SYS_CODE64_SEL # selector 15:0\r
717 .byte 0 # 0 for interrupt gate\r
718 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
719 .word 0 # offset 31:16\r
720 .long 0 # offset 63:32\r
721 .long 0 # 0 for reserved\r
722\r
723# debug exception (INT 1)\r
724.equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r
725 .word 0 # offset 15:0\r
726 .long SYS_CODE64_SEL # selector 15:0\r
727 .byte 0 # 0 for interrupt gate\r
728 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
729 .word 0 # offset 31:16\r
730 .long 0 # offset 63:32\r
731 .long 0 # 0 for reserved\r
732\r
733# NMI (INT 2)\r
734.equ NMI_SEL, .-IDT_BASE\r
735 .word 0 # offset 15:0\r
736 .long SYS_CODE64_SEL # selector 15:0\r
737 .byte 0 # 0 for interrupt gate\r
738 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
739 .word 0 # offset 31:16\r
740 .long 0 # offset 63:32\r
741 .long 0 # 0 for reserved\r
742\r
743# soft breakpoint (INT 3)\r
744.equ BREAKPOINT_SEL, .-IDT_BASE\r
745 .word 0 # offset 15:0\r
746 .long SYS_CODE64_SEL # selector 15:0\r
747 .byte 0 # 0 for interrupt gate\r
748 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
749 .word 0 # offset 31:16\r
750 .long 0 # offset 63:32\r
751 .long 0 # 0 for reserved\r
752\r
753# overflow (INT 4)\r
754.equ OVERFLOW_SEL, .-IDT_BASE\r
755 .word 0 # offset 15:0\r
756 .long SYS_CODE64_SEL # selector 15:0\r
757 .byte 0 # 0 for interrupt gate\r
758 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
759 .word 0 # offset 31:16\r
760 .long 0 # offset 63:32\r
761 .long 0 # 0 for reserved\r
762\r
763# bounds check (INT 5)\r
764.equ BOUNDS_CHECK_SEL, .-IDT_BASE\r
765 .word 0 # offset 15:0\r
766 .long SYS_CODE64_SEL # selector 15:0\r
767 .byte 0 # 0 for interrupt gate\r
768 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
769 .word 0 # offset 31:16\r
770 .long 0 # offset 63:32\r
771 .long 0 # 0 for reserved\r
772\r
773# invalid opcode (INT 6)\r
774.equ INVALID_OPCODE_SEL, .-IDT_BASE\r
775 .word 0 # offset 15:0\r
776 .long SYS_CODE64_SEL # selector 15:0\r
777 .byte 0 # 0 for interrupt gate\r
778 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
779 .word 0 # offset 31:16\r
780 .long 0 # offset 63:32\r
781 .long 0 # 0 for reserved\r
782\r
783# device not available (INT 7)\r
784.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r
785 .word 0 # offset 15:0\r
786 .long SYS_CODE64_SEL # selector 15:0\r
787 .byte 0 # 0 for interrupt gate\r
788 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
789 .word 0 # offset 31:16\r
790 .long 0 # offset 63:32\r
791 .long 0 # 0 for reserved\r
792\r
793# double fault (INT 8)\r
794.equ DOUBLE_FAULT_SEL, .-IDT_BASE\r
795 .word 0 # offset 15:0\r
796 .long SYS_CODE64_SEL # selector 15:0\r
797 .byte 0 # 0 for interrupt gate\r
798 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
799 .word 0 # offset 31:16\r
800 .long 0 # offset 63:32\r
801 .long 0 # 0 for reserved\r
802\r
803# Coprocessor segment overrun - reserved (INT 9)\r
804.equ RSVD_INTR_SEL1, .-IDT_BASE\r
805 .word 0 # offset 15:0\r
806 .long SYS_CODE64_SEL # selector 15:0\r
807 .byte 0 # 0 for interrupt gate\r
808 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
809 .word 0 # offset 31:16\r
810 .long 0 # offset 63:32\r
811 .long 0 # 0 for reserved\r
812\r
813# invalid TSS (INT 0ah)\r
814.equ INVALID_TSS_SEL, .-IDT_BASE\r
815 .word 0 # offset 15:0\r
816 .long SYS_CODE64_SEL # selector 15:0\r
817 .byte 0 # 0 for interrupt gate\r
818 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
819 .word 0 # offset 31:16\r
820 .long 0 # offset 63:32\r
821 .long 0 # 0 for reserved\r
822\r
823# segment not present (INT 0bh)\r
824.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r
825 .word 0 # offset 15:0\r
826 .long SYS_CODE64_SEL # selector 15:0\r
827 .byte 0 # 0 for interrupt gate\r
828 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
829 .word 0 # offset 31:16\r
830 .long 0 # offset 63:32\r
831 .long 0 # 0 for reserved\r
832\r
833# stack fault (INT 0ch)\r
834.equ STACK_FAULT_SEL, .-IDT_BASE\r
835 .word 0 # offset 15:0\r
836 .long SYS_CODE64_SEL # selector 15:0\r
837 .byte 0 # 0 for interrupt gate\r
838 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
839 .word 0 # offset 31:16\r
840 .long 0 # offset 63:32\r
841 .long 0 # 0 for reserved\r
842\r
843# general protection (INT 0dh)\r
844.equ GP_FAULT_SEL, .-IDT_BASE\r
845 .word 0 # offset 15:0\r
846 .long SYS_CODE64_SEL # selector 15:0\r
847 .byte 0 # 0 for interrupt gate\r
848 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
849 .word 0 # offset 31:16\r
850 .long 0 # offset 63:32\r
851 .long 0 # 0 for reserved\r
852\r
853# page fault (INT 0eh)\r
854.equ PAGE_FAULT_SEL, .-IDT_BASE\r
855 .word 0 # offset 15:0\r
856 .long SYS_CODE64_SEL # selector 15:0\r
857 .byte 0 # 0 for interrupt gate\r
858 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
859 .word 0 # offset 31:16\r
860 .long 0 # offset 63:32\r
861 .long 0 # 0 for reserved\r
862\r
863# Intel reserved - do not use (INT 0fh)\r
864.equ RSVD_INTR_SEL2, .-IDT_BASE\r
865 .word 0 # offset 15:0\r
866 .long SYS_CODE64_SEL # selector 15:0\r
867 .byte 0 # 0 for interrupt gate\r
868 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
869 .word 0 # offset 31:16\r
870 .long 0 # offset 63:32\r
871 .long 0 # 0 for reserved\r
872\r
873# floating point error (INT 10h)\r
874.equ FLT_POINT_ERR_SEL, .-IDT_BASE\r
875 .word 0 # offset 15:0\r
876 .long SYS_CODE64_SEL # selector 15:0\r
877 .byte 0 # 0 for interrupt gate\r
878 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
879 .word 0 # offset 31:16\r
880 .long 0 # offset 63:32\r
881 .long 0 # 0 for reserved\r
882\r
883# alignment check (INT 11h)\r
884.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r
885 .word 0 # offset 15:0\r
886 .long SYS_CODE64_SEL # selector 15:0\r
887 .byte 0 # 0 for interrupt gate\r
888 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
889 .word 0 # offset 31:16\r
890 .long 0 # offset 63:32\r
891 .long 0 # 0 for reserved\r
892\r
893# machine check (INT 12h)\r
894.equ MACHINE_CHECK_SEL, .-IDT_BASE\r
895 .word 0 # offset 15:0\r
896 .long SYS_CODE64_SEL # selector 15:0\r
897 .byte 0 # 0 for interrupt gate\r
898 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
899 .word 0 # offset 31:16\r
900 .long 0 # offset 63:32\r
901 .long 0 # 0 for reserved\r
902\r
903# SIMD floating-point exception (INT 13h)\r
904.equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r
905 .word 0 # offset 15:0\r
906 .long SYS_CODE64_SEL # selector 15:0\r
907 .byte 0 # 0 for interrupt gate\r
908 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
909 .word 0 # offset 31:16\r
910 .long 0 # offset 63:32\r
911 .long 0 # 0 for reserved\r
912\r
913# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r
914 .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)\r
915\r
916# IRQ 0 (System timer) - (INT 68h)\r
917.equ IRQ0_SEL, .-IDT_BASE\r
918 .word 0 # offset 15:0\r
919 .long SYS_CODE64_SEL # selector 15:0\r
920 .byte 0 # 0 for interrupt gate\r
921 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
922 .word 0 # offset 31:16\r
923 .long 0 # offset 63:32\r
924 .long 0 # 0 for reserved\r
925\r
926# IRQ 1 (8042 Keyboard controller) - (INT 69h)\r
927.equ IRQ1_SEL, .-IDT_BASE\r
928 .word 0 # offset 15:0\r
929 .long SYS_CODE64_SEL # selector 15:0\r
930 .byte 0 # 0 for interrupt gate\r
931 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
932 .word 0 # offset 31:16\r
933 .long 0 # offset 63:32\r
934 .long 0 # 0 for reserved\r
935\r
936# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r
937.equ IRQ2_SEL, .-IDT_BASE\r
938 .word 0 # offset 15:0\r
939 .long SYS_CODE64_SEL # selector 15:0\r
940 .byte 0 # 0 for interrupt gate\r
941 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
942 .word 0 # offset 31:16\r
943 .long 0 # offset 63:32\r
944 .long 0 # 0 for reserved\r
945\r
946# IRQ 3 (COM 2) - (INT 6bh)\r
947.equ IRQ3_SEL, .-IDT_BASE\r
948 .word 0 # offset 15:0\r
949 .long SYS_CODE64_SEL # selector 15:0\r
950 .byte 0 # 0 for interrupt gate\r
951 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
952 .word 0 # offset 31:16\r
953 .long 0 # offset 63:32\r
954 .long 0 # 0 for reserved\r
955\r
956# IRQ 4 (COM 1) - (INT 6ch)\r
957.equ IRQ4_SEL, .-IDT_BASE\r
958 .word 0 # offset 15:0\r
959 .long SYS_CODE64_SEL # selector 15:0\r
960 .byte 0 # 0 for interrupt gate\r
961 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
962 .word 0 # offset 31:16\r
963 .long 0 # offset 63:32\r
964 .long 0 # 0 for reserved\r
965\r
966# IRQ 5 (LPT 2) - (INT 6dh)\r
967.equ IRQ5_SEL, .-IDT_BASE\r
968 .word 0 # offset 15:0\r
969 .long SYS_CODE64_SEL # selector 15:0\r
970 .byte 0 # 0 for interrupt gate\r
971 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
972 .word 0 # offset 31:16\r
973 .long 0 # offset 63:32\r
974 .long 0 # 0 for reserved\r
975\r
976# IRQ 6 (Floppy controller) - (INT 6eh)\r
977.equ IRQ6_SEL, .-IDT_BASE\r
978 .word 0 # offset 15:0\r
979 .long SYS_CODE64_SEL # selector 15:0\r
980 .byte 0 # 0 for interrupt gate\r
981 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
982 .word 0 # offset 31:16\r
983 .long 0 # offset 63:32\r
984 .long 0 # 0 for reserved\r
985\r
986# IRQ 7 (LPT 1) - (INT 6fh)\r
987.equ IRQ7_SEL, .-IDT_BASE\r
988 .word 0 # offset 15:0\r
989 .long SYS_CODE64_SEL # selector 15:0\r
990 .byte 0 # 0 for interrupt gate\r
991 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
992 .word 0 # offset 31:16\r
993 .long 0 # offset 63:32\r
994 .long 0 # 0 for reserved\r
995\r
996# IRQ 8 (RTC Alarm) - (INT 70h)\r
997.equ IRQ8_SEL, .-IDT_BASE\r
998 .word 0 # offset 15:0\r
999 .long SYS_CODE64_SEL # selector 15:0\r
1000 .byte 0 # 0 for interrupt gate\r
1001 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1002 .word 0 # offset 31:16\r
1003 .long 0 # offset 63:32\r
1004 .long 0 # 0 for reserved\r
1005\r
1006# IRQ 9 - (INT 71h)\r
1007.equ IRQ9_SEL, .-IDT_BASE\r
1008 .word 0 # offset 15:0\r
1009 .long SYS_CODE64_SEL # selector 15:0\r
1010 .byte 0 # 0 for interrupt gate\r
1011 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1012 .word 0 # offset 31:16\r
1013 .long 0 # offset 63:32\r
1014 .long 0 # 0 for reserved\r
1015\r
1016# IRQ 10 - (INT 72h)\r
1017.equ IRQ10_SEL, .-IDT_BASE\r
1018 .word 0 # offset 15:0\r
1019 .long SYS_CODE64_SEL # selector 15:0\r
1020 .byte 0 # 0 for interrupt gate\r
1021 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1022 .word 0 # offset 31:16\r
1023 .long 0 # offset 63:32\r
1024 .long 0 # 0 for reserved\r
1025\r
1026# IRQ 11 - (INT 73h)\r
1027.equ IRQ11_SEL, .-IDT_BASE\r
1028 .word 0 # offset 15:0\r
1029 .long SYS_CODE64_SEL # selector 15:0\r
1030 .byte 0 # 0 for interrupt gate\r
1031 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1032 .word 0 # offset 31:16\r
1033 .long 0 # offset 63:32\r
1034 .long 0 # 0 for reserved\r
1035\r
1036# IRQ 12 (PS/2 mouse) - (INT 74h)\r
1037.equ IRQ12_SEL, .-IDT_BASE\r
1038 .word 0 # offset 15:0\r
1039 .long SYS_CODE64_SEL # selector 15:0\r
1040 .byte 0 # 0 for interrupt gate\r
1041 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1042 .word 0 # offset 31:16\r
1043 .long 0 # offset 63:32\r
1044 .long 0 # 0 for reserved\r
1045\r
1046# IRQ 13 (Floating point error) - (INT 75h)\r
1047.equ IRQ13_SEL, .-IDT_BASE\r
1048 .word 0 # offset 15:0\r
1049 .long SYS_CODE64_SEL # selector 15:0\r
1050 .byte 0 # 0 for interrupt gate\r
1051 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1052 .word 0 # offset 31:16\r
1053 .long 0 # offset 63:32\r
1054 .long 0 # 0 for reserved\r
1055\r
1056# IRQ 14 (Secondary IDE) - (INT 76h)\r
1057.equ IRQ14_SEL, .-IDT_BASE\r
1058 .word 0 # offset 15:0\r
1059 .long SYS_CODE64_SEL # selector 15:0\r
1060 .byte 0 # 0 for interrupt gate\r
1061 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1062 .word 0 # offset 31:16\r
1063 .long 0 # offset 63:32\r
1064 .long 0 # 0 for reserved\r
1065\r
1066# IRQ 15 (Primary IDE) - (INT 77h)\r
1067.equ IRQ15_SEL, .-IDT_BASE\r
1068 .word 0 # offset 15:0\r
1069 .long SYS_CODE64_SEL # selector 15:0\r
1070 .byte 0 # 0 for interrupt gate\r
1071 .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
1072 .word 0 # offset 31:16\r
1073 .long 0 # offset 63:32\r
1074 .long 0 # 0 for reserved\r
1075\r
1076IDT_END: \r
1077\r
1078 .p2align 1\r
1079\r
1080MemoryMapSize: .long 0\r
1081MemoryMap: .long 0,0,0,0,0,0,0,0\r
1082 .long 0,0,0,0,0,0,0,0\r
1083 .long 0,0,0,0,0,0,0,0\r
1084 .long 0,0,0,0,0,0,0,0\r
1085 .long 0,0,0,0,0,0,0,0\r
1086 .long 0,0,0,0,0,0,0,0\r
1087 .long 0,0,0,0,0,0,0,0\r
1088 .long 0,0,0,0,0,0,0,0\r
1089 .long 0,0,0,0,0,0,0,0\r
1090 .long 0,0,0,0,0,0,0,0\r
1091 .long 0,0,0,0,0,0,0,0\r
1092 .long 0,0,0,0,0,0,0,0\r
1093 .long 0,0,0,0,0,0,0,0\r
1094 .long 0,0,0,0,0,0,0,0\r
1095 .long 0,0,0,0,0,0,0,0\r
1096 .long 0,0,0,0,0,0,0,0\r
1097 .long 0,0,0,0,0,0,0,0\r
1098 .long 0,0,0,0,0,0,0,0\r
1099 .long 0,0,0,0,0,0,0,0\r
1100 .long 0,0,0,0,0,0,0,0\r
1101 .long 0,0,0,0,0,0,0,0\r
1102 .long 0,0,0,0,0,0,0,0\r
1103 .long 0,0,0,0,0,0,0,0\r
1104 .long 0,0,0,0,0,0,0,0\r
1105 .long 0,0,0,0,0,0,0,0\r
1106 .long 0,0,0,0,0,0,0,0\r
1107 .long 0,0,0,0,0,0,0,0\r
1108 .long 0,0,0,0,0,0,0,0\r
1109 .long 0,0,0,0,0,0,0,0\r
1110 .long 0,0,0,0,0,0,0,0\r
1111\r
1112 .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
1113\r
1114 .org 0x0fe0\r
1115MyStack: \r
1116 # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r
1117 # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r
1118 # known low address (20f00) so it can be set up by PlMapIrqToVect in\r
1119 # 8259.c\r
1120\r
1121 int $8\r
1122 iret\r
1123\r
1124 int $9\r
1125 iret\r
1126\r
1127 int $10\r
1128 iret\r
1129\r
1130 int $11\r
1131 iret\r
1132\r
1133 int $12\r
1134 iret\r
1135\r
1136 int $13\r
1137 iret\r
1138\r
1139 int $14\r
1140 iret\r
1141\r
1142 int $15\r
1143 iret\r
1144\r
1145\r
1146 .org 0x0ffe\r
1147BlockSignature: \r
1148 .word 0xaa55\r
1149\r
EFI Development Kit II mirror for PVE