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1 | ;------------------------------------------------------------------------------\r | |
2 | ;*\r | |
3 | ;* Copyright 2006, 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 | ;* efi32.asm\r | |
13 | ;* \r | |
14 | ;* Abstract:\r | |
15 | ;*\r | |
16 | ;------------------------------------------------------------------------------\r | |
17 | \r | |
18 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
19 | ; Now in 32-bit protected mode.\r | |
20 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\r | |
21 | \r | |
22 | .486\r | |
23 | .model flat \r | |
24 | .stack\r | |
25 | .code\r | |
26 | org 21000h\r | |
27 | \r | |
28 | DEFAULT_HANDLER_SIZE EQU INT1 - INT0\r | |
29 | \r | |
30 | JmpCommonIdtEntry macro\r | |
31 | ; jmp commonIdtEntry - this must be hand coded to keep the assembler from\r | |
32 | ; using a 8 bit reletive jump when the entries are\r | |
33 | ; within 255 bytes of the common entry. This must\r | |
34 | ; be done to maintain the consistency of the size\r | |
35 | ; of entry points...\r | |
36 | db 0e9h ; jmp 16 bit relative \r | |
37 | dd commonIdtEntry - $ - 4 ; offset to jump to\r | |
38 | endm \r | |
39 | \r | |
40 | \r | |
41 | Start: \r | |
42 | mov ds,ax\r | |
43 | mov es,ax\r | |
44 | mov fs,ax\r | |
45 | mov gs,ax\r | |
46 | mov ss,ax\r | |
47 | mov esp,0001ffff0h\r | |
48 | \r | |
49 | call ClearScreen\r | |
50 | \r | |
51 | ; Populate IDT with meaningful offsets for exception handlers...\r | |
52 | sidt fword ptr [Idtr] ; get fword address of IDT\r | |
53 | \r | |
54 | mov eax, offset Halt\r | |
55 | mov ebx, eax ; use bx to copy 15..0 to descriptors\r | |
56 | shr eax, 16 ; use ax to copy 31..16 to descriptors \r | |
57 | mov ecx, 78h ; 78h IDT entries to initialize with unique entry points (exceptions)\r | |
58 | mov esi, [offset Idtr + 2]\r | |
59 | mov edi, [esi]\r | |
60 | \r | |
61 | @@: ; loop through all IDT entries exception handlers and initialize to default handler\r | |
62 | mov word ptr [edi], bx ; write bits 15..0 of offset\r | |
63 | mov word ptr [edi+2], 20h ; SYS_CODE_SEL from GDT\r | |
64 | mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present\r | |
65 | mov word ptr [edi+6], ax ; write bits 31..16 of offset\r | |
66 | add edi, 8 ; move up to next descriptor\r | |
67 | add bx, DEFAULT_HANDLER_SIZE ; move to next entry point\r | |
68 | loop @b ; loop back through again until all descriptors are initialized\r | |
69 | \r | |
70 | ;; at this point edi contains the offset of the descriptor for INT 20\r | |
71 | ;; and bx contains the low 16 bits of the offset of the default handler\r | |
72 | ;; so initialize all the rest of the descriptors with these two values...\r | |
73 | ; mov ecx, 101 ; there are 100 descriptors left (INT 20 (14h) - INT 119 (77h)\r | |
74 | ;@@: ; loop through all IDT entries exception handlers and initialize to default handler\r | |
75 | ; mov word ptr [edi], bx ; write bits 15..0 of offset\r | |
76 | ; mov word ptr [edi+2], 20h ; SYS_CODE_SEL from GDT\r | |
77 | ; mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present\r | |
78 | ; mov word ptr [edi+6], ax ; write bits 31..16 of offset\r | |
79 | ; add edi, 8 ; move up to next descriptor\r | |
80 | ; loop @b ; loop back through again until all descriptors are initialized\r | |
81 | \r | |
82 | \r | |
83 | ;; DUMP location of IDT and several of the descriptors\r | |
84 | ; mov ecx, 8\r | |
85 | ; mov eax, [offset Idtr + 2]\r | |
86 | ; mov eax, [eax]\r | |
87 | ; mov edi, 0b8000h\r | |
88 | ; call PrintDword\r | |
89 | ; mov esi, eax\r | |
90 | ; mov edi, 0b80a0h\r | |
91 | ; jmp OuterLoop\r | |
92 | \r | |
93 | ;; \r | |
94 | ;; just for fun, let's do a software interrupt to see if we correctly land in the exception handler...\r | |
95 | ; mov eax, 011111111h\r | |
96 | ; mov ebx, 022222222h\r | |
97 | ; mov ecx, 033333333h\r | |
98 | ; mov edx, 044444444h\r | |
99 | ; mov ebp, 055555555h\r | |
100 | ; mov esi, 066666666h\r | |
101 | ; mov edi, 077777777h\r | |
102 | ; push 011111111h\r | |
103 | ; push 022222222h\r | |
104 | ; push 033333333h\r | |
105 | ; int 119\r | |
106 | \r | |
107 | \r | |
108 | mov esi,022000h ; esi = 22000\r | |
109 | mov eax,[esi+014h] ; eax = [22014]\r | |
110 | add esi,eax ; esi = 22000 + [22014] = Base of EFILDR.C\r | |
111 | mov ebp,[esi+03ch] ; ebp = [22000 + [22014] + 3c] = NT Image Header for EFILDR.C\r | |
112 | add ebp,esi\r | |
113 | mov edi,[ebp+034h] ; edi = [[22000 + [22014] + 3c] + 30] = ImageBase\r | |
114 | mov eax,[ebp+028h] ; eax = [[22000 + [22014] + 3c] + 24] = EntryPoint\r | |
115 | add eax,edi ; eax = ImageBase + EntryPoint\r | |
116 | mov dword ptr [EfiLdrOffset],eax ; Modify far jump instruction for correct entry point\r | |
117 | \r | |
118 | mov bx,word ptr[ebp+6] ; bx = Number of sections\r | |
119 | xor eax,eax\r | |
120 | mov ax,word ptr[ebp+014h] ; ax = Optional Header Size\r | |
121 | add ebp,eax\r | |
122 | add ebp,018h ; ebp = Start of 1st Section\r | |
123 | \r | |
124 | SectionLoop:\r | |
125 | push esi ; Save Base of EFILDR.C\r | |
126 | push edi ; Save ImageBase\r | |
127 | add esi,[ebp+014h] ; esi = Base of EFILDR.C + PointerToRawData\r | |
128 | add edi,[ebp+00ch] ; edi = ImageBase + VirtualAddress\r | |
129 | mov ecx,[ebp+010h] ; ecs = SizeOfRawData\r | |
130 | \r | |
131 | cld\r | |
132 | shr ecx,2\r | |
133 | rep movsd\r | |
134 | \r | |
135 | pop edi ; Restore ImageBase\r | |
136 | pop esi ; Restore Base of EFILDR.C\r | |
137 | \r | |
138 | add bp,028h ; ebp = ebp + 028h = Pointer to next section record\r | |
139 | dec bx\r | |
140 | cmp bx,0\r | |
141 | jne SectionLoop\r | |
142 | \r | |
143 | movzx eax, word ptr [Idtr] ; get size of IDT\r | |
144 | inc eax\r | |
145 | add eax, dword ptr [Idtr + 2] ; add to base of IDT to get location of memory map...\r | |
146 | push eax ; push memory map location on stack for call to EFILDR...\r | |
147 | \r | |
148 | push eax ; push return address (useless, just for stack balance)\r | |
149 | db 0b8h\r | |
150 | EfiLdrOffset:\r | |
151 | dd 000401000h ; Offset of EFILDR\r | |
152 | ; mov eax, 401000h\r | |
153 | push eax\r | |
154 | ret\r | |
155 | \r | |
156 | ; db "**** DEFAULT IDT ENTRY ***",0\r | |
157 | align 02h\r | |
158 | Halt:\r | |
159 | INT0:\r | |
160 | push 0h ; push error code place holder on the stack\r | |
161 | push 0h\r | |
162 | JmpCommonIdtEntry\r | |
163 | ; db 0e9h ; jmp 16 bit reletive \r | |
164 | ; dd commonIdtEntry - $ - 4 ; offset to jump to\r | |
165 | \r | |
166 | INT1:\r | |
167 | push 0h ; push error code place holder on the stack\r | |
168 | push 1h\r | |
169 | JmpCommonIdtEntry\r | |
170 | \r | |
171 | INT2:\r | |
172 | push 0h ; push error code place holder on the stack\r | |
173 | push 2h\r | |
174 | JmpCommonIdtEntry\r | |
175 | \r | |
176 | INT3:\r | |
177 | push 0h ; push error code place holder on the stack\r | |
178 | push 3h\r | |
179 | JmpCommonIdtEntry\r | |
180 | \r | |
181 | INT4:\r | |
182 | push 0h ; push error code place holder on the stack\r | |
183 | push 4h\r | |
184 | JmpCommonIdtEntry\r | |
185 | \r | |
186 | INT5:\r | |
187 | push 0h ; push error code place holder on the stack\r | |
188 | push 5h\r | |
189 | JmpCommonIdtEntry\r | |
190 | \r | |
191 | INT6:\r | |
192 | push 0h ; push error code place holder on the stack\r | |
193 | push 6h\r | |
194 | JmpCommonIdtEntry\r | |
195 | \r | |
196 | INT7:\r | |
197 | push 0h ; push error code place holder on the stack\r | |
198 | push 7h\r | |
199 | JmpCommonIdtEntry\r | |
200 | \r | |
201 | INT8:\r | |
202 | ; Double fault causes an error code to be pushed so no phony push necessary\r | |
203 | nop\r | |
204 | nop\r | |
205 | push 8h\r | |
206 | JmpCommonIdtEntry\r | |
207 | \r | |
208 | INT9:\r | |
209 | push 0h ; push error code place holder on the stack\r | |
210 | push 9h\r | |
211 | JmpCommonIdtEntry\r | |
212 | \r | |
213 | INT10:\r | |
214 | ; Invalid TSS causes an error code to be pushed so no phony push necessary\r | |
215 | nop\r | |
216 | nop\r | |
217 | push 10\r | |
218 | JmpCommonIdtEntry\r | |
219 | \r | |
220 | INT11:\r | |
221 | ; Segment Not Present causes an error code to be pushed so no phony push necessary\r | |
222 | nop\r | |
223 | nop\r | |
224 | push 11\r | |
225 | JmpCommonIdtEntry\r | |
226 | \r | |
227 | INT12:\r | |
228 | ; Stack fault causes an error code to be pushed so no phony push necessary\r | |
229 | nop\r | |
230 | nop\r | |
231 | push 12\r | |
232 | JmpCommonIdtEntry\r | |
233 | \r | |
234 | INT13:\r | |
235 | ; GP fault causes an error code to be pushed so no phony push necessary\r | |
236 | nop\r | |
237 | nop\r | |
238 | push 13\r | |
239 | JmpCommonIdtEntry\r | |
240 | \r | |
241 | INT14:\r | |
242 | ; Page fault causes an error code to be pushed so no phony push necessary\r | |
243 | nop\r | |
244 | nop\r | |
245 | push 14\r | |
246 | JmpCommonIdtEntry\r | |
247 | \r | |
248 | INT15:\r | |
249 | push 0h ; push error code place holder on the stack\r | |
250 | push 15\r | |
251 | JmpCommonIdtEntry\r | |
252 | \r | |
253 | INT16:\r | |
254 | push 0h ; push error code place holder on the stack\r | |
255 | push 16\r | |
256 | JmpCommonIdtEntry\r | |
257 | \r | |
258 | INT17:\r | |
259 | ; Alignment check causes an error code to be pushed so no phony push necessary\r | |
260 | nop\r | |
261 | nop\r | |
262 | push 17\r | |
263 | JmpCommonIdtEntry\r | |
264 | \r | |
265 | INT18:\r | |
266 | push 0h ; push error code place holder on the stack\r | |
267 | push 18\r | |
268 | JmpCommonIdtEntry\r | |
269 | \r | |
270 | INT19:\r | |
271 | push 0h ; push error code place holder on the stack\r | |
272 | push 19\r | |
273 | JmpCommonIdtEntry\r | |
274 | \r | |
275 | INTUnknown:\r | |
276 | REPEAT (78h - 20)\r | |
277 | push 0h ; push error code place holder on the stack\r | |
278 | ; push xxh ; push vector number\r | |
279 | db 06ah\r | |
280 | db ( $ - INTUnknown - 3 ) / 9 + 20 ; vector number\r | |
281 | JmpCommonIdtEntry\r | |
282 | ENDM\r | |
283 | \r | |
284 | commonIdtEntry:\r | |
285 | pushad\r | |
286 | mov ebp, esp\r | |
287 | ;;\r | |
288 | ;; At this point the stack looks like this:\r | |
289 | ;;\r | |
290 | ;; eflags\r | |
291 | ;; Calling CS\r | |
292 | ;; Calling EIP\r | |
293 | ;; Error code or 0\r | |
294 | ;; Int num or 0ffh for unknown int num\r | |
295 | ;; eax\r | |
296 | ;; ecx\r | |
297 | ;; edx\r | |
298 | ;; ebx\r | |
299 | ;; esp\r | |
300 | ;; ebp\r | |
301 | ;; esi\r | |
302 | ;; edi <------- ESP, EBP\r | |
303 | ;; \r | |
304 | \r | |
305 | call ClearScreen\r | |
306 | mov esi, offset String1\r | |
307 | call PrintString\r | |
308 | mov eax, [ebp + 32] ;; move Int number into EAX \r | |
309 | cmp eax, 19\r | |
310 | ja PrintDefaultString\r | |
311 | PrintExceptionString:\r | |
312 | shl eax, 2 ;; multiply by 4 to get offset from StringTable to actual string address\r | |
313 | add eax, offset StringTable\r | |
314 | mov esi, [eax]\r | |
315 | jmp PrintTheString\r | |
316 | PrintDefaultString:\r | |
317 | mov esi, offset IntUnknownString\r | |
318 | ; patch Int number\r | |
319 | mov edx, eax\r | |
320 | call A2C\r | |
321 | mov [esi + 1], al\r | |
322 | mov eax, edx\r | |
323 | shr eax, 4\r | |
324 | call A2C\r | |
325 | mov [esi], al\r | |
326 | PrintTheString: \r | |
327 | call PrintString\r | |
328 | mov esi, offset String2\r | |
329 | call PrintString\r | |
330 | mov eax, [ebp+44] ; CS\r | |
331 | call PrintDword\r | |
332 | mov al, ':'\r | |
333 | mov byte ptr [edi], al\r | |
334 | add edi, 2\r | |
335 | mov eax, [ebp+40] ; EIP\r | |
336 | call PrintDword\r | |
337 | mov esi, offset String3\r | |
338 | call PrintString\r | |
339 | \r | |
340 | mov edi, 0b8140h\r | |
341 | \r | |
342 | mov esi, offset StringEax ; eax\r | |
343 | call PrintString\r | |
344 | mov eax, [ebp+28]\r | |
345 | call PrintDword\r | |
346 | \r | |
347 | mov esi, offset StringEbx ; ebx\r | |
348 | call PrintString\r | |
349 | mov eax, [ebp+16]\r | |
350 | call PrintDword\r | |
351 | \r | |
352 | mov esi, offset StringEcx ; ecx\r | |
353 | call PrintString\r | |
354 | mov eax, [ebp+24]\r | |
355 | call PrintDword\r | |
356 | \r | |
357 | mov esi, offset StringEdx ; edx\r | |
358 | call PrintString\r | |
359 | mov eax, [ebp+20]\r | |
360 | call PrintDword\r | |
361 | \r | |
362 | mov esi, offset StringEcode ; error code\r | |
363 | call PrintString\r | |
364 | mov eax, [ebp+36]\r | |
365 | call PrintDword\r | |
366 | \r | |
367 | mov edi, 0b81e0h\r | |
368 | \r | |
369 | mov esi, offset StringEsp ; esp\r | |
370 | call PrintString\r | |
371 | mov eax, [ebp+12]\r | |
372 | call PrintDword\r | |
373 | \r | |
374 | mov esi, offset StringEbp ; ebp\r | |
375 | call PrintString\r | |
376 | mov eax, [ebp+8]\r | |
377 | call PrintDword\r | |
378 | \r | |
379 | mov esi, offset StringEsi ; esi\r | |
380 | call PrintString\r | |
381 | mov eax, [ebp+4]\r | |
382 | call PrintDword\r | |
383 | \r | |
384 | mov esi, offset StringEdi ; edi\r | |
385 | call PrintString\r | |
386 | mov eax, [ebp]\r | |
387 | call PrintDword\r | |
388 | \r | |
389 | mov esi, offset StringEflags ; eflags\r | |
390 | call PrintString\r | |
391 | mov eax, [ebp+48]\r | |
392 | call PrintDword\r | |
393 | \r | |
394 | mov edi, 0b8320h\r | |
395 | \r | |
396 | mov esi, ebp\r | |
397 | add esi, 52\r | |
398 | mov ecx, 8\r | |
399 | \r | |
400 | \r | |
401 | OuterLoop:\r | |
402 | push ecx\r | |
403 | mov ecx, 8\r | |
404 | mov edx, edi\r | |
405 | \r | |
406 | InnerLoop:\r | |
407 | mov eax, [esi]\r | |
408 | call PrintDword\r | |
409 | add esi, 4\r | |
410 | mov al, ' '\r | |
411 | mov [edi], al\r | |
412 | add edi, 2\r | |
413 | loop InnerLoop\r | |
414 | \r | |
415 | pop ecx\r | |
416 | add edx, 0a0h\r | |
417 | mov edi, edx\r | |
418 | loop OuterLoop\r | |
419 | \r | |
420 | \r | |
421 | mov edi, 0b8960h\r | |
422 | \r | |
423 | mov eax, [ebp+40] ; EIP\r | |
424 | sub eax, 32 * 4\r | |
425 | mov esi, eax ; esi = eip - 32 DWORD linear (total 64 DWORD)\r | |
426 | \r | |
427 | mov ecx, 8\r | |
428 | \r | |
429 | OuterLoop1:\r | |
430 | push ecx\r | |
431 | mov ecx, 8\r | |
432 | mov edx, edi\r | |
433 | \r | |
434 | InnerLoop1:\r | |
435 | mov eax, [esi]\r | |
436 | call PrintDword\r | |
437 | add esi, 4\r | |
438 | mov al, ' '\r | |
439 | mov [edi], al\r | |
440 | add edi, 2\r | |
441 | loop InnerLoop1\r | |
442 | \r | |
443 | pop ecx\r | |
444 | add edx, 0a0h\r | |
445 | mov edi, edx\r | |
446 | loop OuterLoop1\r | |
447 | \r | |
448 | \r | |
449 | \r | |
450 | ; wbinvd ; Ken: this intruction does not support in early than 486 arch\r | |
451 | @@: \r | |
452 | jmp @b\r | |
453 | ;\r | |
454 | ; return\r | |
455 | ;\r | |
456 | mov esp, ebp\r | |
457 | popad\r | |
458 | add esp, 8 ; error code and INT number\r | |
459 | \r | |
460 | iretd\r | |
461 | \r | |
462 | \r | |
463 | PrintString:\r | |
464 | push eax\r | |
465 | @@:\r | |
466 | mov al, byte ptr [esi]\r | |
467 | cmp al, 0\r | |
468 | je @f\r | |
469 | mov byte ptr [edi], al\r | |
470 | inc esi\r | |
471 | add edi, 2\r | |
472 | jmp @b\r | |
473 | @@:\r | |
474 | pop eax\r | |
475 | ret\r | |
476 | \r | |
477 | ;; EAX contains dword to print\r | |
478 | ;; EDI contains memory location (screen location) to print it to\r | |
479 | PrintDword:\r | |
480 | push ecx\r | |
481 | push ebx\r | |
482 | push eax\r | |
483 | \r | |
484 | mov ecx, 8\r | |
485 | looptop:\r | |
486 | rol eax, 4\r | |
487 | mov bl, al\r | |
488 | and bl, 0fh\r | |
489 | add bl, '0'\r | |
490 | cmp bl, '9'\r | |
491 | jle @f\r | |
492 | add bl, 7\r | |
493 | @@:\r | |
494 | mov byte ptr [edi], bl\r | |
495 | add edi, 2\r | |
496 | loop looptop\r | |
497 | ;wbinvd\r | |
498 | \r | |
499 | pop eax\r | |
500 | pop ebx\r | |
501 | pop ecx\r | |
502 | ret\r | |
503 | \r | |
504 | ClearScreen:\r | |
505 | push eax\r | |
506 | push ecx\r | |
507 | \r | |
508 | mov al, ' '\r | |
509 | mov ah, 0ch\r | |
510 | mov edi, 0b8000h\r | |
511 | mov ecx, 80 * 24\r | |
512 | @@:\r | |
513 | mov word ptr [edi], ax\r | |
514 | add edi, 2\r | |
515 | loop @b\r | |
516 | mov edi, 0b8000h\r | |
517 | \r | |
518 | pop ecx\r | |
519 | pop eax\r | |
520 | \r | |
521 | ret \r | |
522 | \r | |
523 | A2C:\r | |
524 | and al, 0fh\r | |
525 | add al, '0'\r | |
526 | cmp al, '9'\r | |
527 | jle @f\r | |
528 | add al, 7\r | |
529 | @@:\r | |
530 | ret\r | |
531 | \r | |
532 | String1 db "*** INT ",0\r | |
533 | \r | |
534 | Int0String db "00h Divide by 0 -",0\r | |
535 | Int1String db "01h Debug exception -",0\r | |
536 | Int2String db "02h NMI -",0\r | |
537 | Int3String db "03h Breakpoint -",0\r | |
538 | Int4String db "04h Overflow -",0\r | |
539 | Int5String db "05h Bound -",0\r | |
540 | Int6String db "06h Invalid opcode -",0\r | |
541 | Int7String db "07h Device not available -",0\r | |
542 | Int8String db "08h Double fault -",0\r | |
543 | Int9String db "09h Coprocessor seg overrun (reserved) -",0\r | |
544 | Int10String db "0Ah Invalid TSS -",0\r | |
545 | Int11String db "0Bh Segment not present -",0\r | |
546 | Int12String db "0Ch Stack fault -",0\r | |
547 | Int13String db "0Dh General protection fault -",0\r | |
548 | Int14String db "0Eh Page fault -",0\r | |
549 | Int15String db "0Fh (Intel reserved) -",0\r | |
550 | Int16String db "10h Floating point error -",0\r | |
551 | Int17String db "11h Alignment check -",0\r | |
552 | Int18String db "12h Machine check -",0\r | |
553 | Int19String db "13h SIMD Floating-Point Exception -",0\r | |
554 | IntUnknownString db "??h Unknown interrupt -",0\r | |
555 | \r | |
556 | StringTable dd offset Int0String, offset Int1String, offset Int2String, offset Int3String, \r | |
557 | offset Int4String, offset Int5String, offset Int6String, offset Int7String,\r | |
558 | offset Int8String, offset Int9String, offset Int10String, offset Int11String,\r | |
559 | offset Int12String, offset Int13String, offset Int14String, offset Int15String,\r | |
560 | offset Int16String, offset Int17String, offset Int18String, offset Int19String\r | |
561 | \r | |
562 | String2 db " HALT!! *** (",0\r | |
563 | String3 db ")",0\r | |
564 | StringEax db "EAX=",0\r | |
565 | StringEbx db " EBX=",0\r | |
566 | StringEcx db " ECX=",0\r | |
567 | StringEdx db " EDX=",0\r | |
568 | StringEcode db " ECODE=",0\r | |
569 | StringEsp db "ESP=",0\r | |
570 | StringEbp db " EBP=",0\r | |
571 | StringEsi db " ESI=",0\r | |
572 | StringEdi db " EDI=",0\r | |
573 | StringEflags db " EFLAGS=",0\r | |
574 | \r | |
575 | Idtr df 0\r | |
576 | \r | |
577 | org 21ffeh\r | |
578 | BlockSignature:\r | |
579 | dw 0aa55h\r | |
580 | \r | |
581 | end\r |