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Import backup from 2003-10-27

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This commit is contained in:
Josh Holtrop 2003-10-27 22:00:00 -05:00
parent aab5ff3c90
commit 36b025ccb4
15 changed files with 107 additions and 2424 deletions
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BIN
kernel.bin
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7
kernel.c
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@ -80,10 +80,13 @@ void k_init()
mouse_init();
printf("HOS 0.1.1 - Kernel Size: %d kb\n", kernel_size()/1024);
printf("%x\t%x\n", read_cr0(), read_cr3());
write_cr3((dword)vmm_PDBR);
write_cr0(0x80000000|read_cr0());
vmm_enable_paging();
printf("%x\t%x\n", read_cr0(), read_cr3());
printf("Memory available to OS: %d MB (Bytes: %d)\n", mm_totalmem/0x100000, mm_totalmem);
vmm_map1(0x45000000, 0xB8000, 0x3);
*((word *)0x45000002) = 0x0444;
vmm_mapn(0x54FFF000, 0xB7000, 0x3, 2);
*((word *)0x55000020) = 0x0443;
pic1_mask(0); //unmask IRQ's 0-7
pic2_mask(0); //unmask IRQ's 8-15
enable_ints();

BIN
lib/hlibc.a
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540
lib/io.lst
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@ -1,540 +0,0 @@
1
2 %macro jzfar 1
3 jnz %%skip
4 jmp %1
5 %%skip:
6
7 %endmacro
8
9 [global _writeCursorPosition]
10 [global _getCursorPosition]
11 [global _putc]
12 [global _puts]
13 [global _printf]
14 [global _console_scroll]
15 [global _console_cls]
16 [global _putHex]
17 [global _putDec]
18 [global _putDecu]
19
20
21 ;
22 ;void writeCursorPosition(word pos)
23 ;
24 _writeCursorPosition:
25 00000000 55 push ebp
26 00000001 89E5 mov ebp, esp
27
28 00000003 50 push eax
29 00000004 53 push ebx
30 00000005 52 push edx
31
32 00000006 8B4508 mov eax, [ebp+8] ;cursor position in ax
33
34 00000009 88C3 mov bl, al
35 0000000B 66BAD403 mov dx, 0x03D4
36 0000000F B00E mov al, 0x0E
37 00000011 EE out dx, al
38
39 00000012 6642 inc dx
40 00000014 88E0 mov al, ah
41 00000016 EE out dx, al
42
43 00000017 664A dec dx
44 00000019 B00F mov al, 0x0F
45 0000001B EE out dx, al
46
47 0000001C 6642 inc dx
48 0000001E 88D8 mov al, bl
49 00000020 EE out dx, al
50
51 00000021 5A pop edx
52 00000022 5B pop ebx
53 00000023 58 pop eax
54 00000024 5D pop ebp
55
56 00000025 C3 ret
57
58
59 ;
60 ;word getCursorPosition()
61 ;
62 _getCursorPosition:
63 00000026 53 push ebx
64 00000027 52 push edx
65
66 00000028 31C0 xor eax, eax
67 0000002A 66BAD403 mov dx, 0x03D4
68 0000002E B00E mov al, 0x0E
69 00000030 EE out dx, al
70
71 00000031 6642 inc dx
72 00000033 EC in al, dx
73 00000034 88C3 mov bl, al
74
75 00000036 664A dec dx
76 00000038 B00F mov al, 0x0F
77 0000003A EE out dx, al
78
79 0000003B 6642 inc dx
80 0000003D EC in al, dx
81 0000003E 88DC mov ah, bl
82
83 00000040 5A pop edx
84 00000041 5B pop ebx
85
86 00000042 C3 ret
87
88
89 ;
90 ;int putc(int chr)
91 ;
92 _putc:
93 00000043 55 push ebp
94 00000044 89E5 mov ebp, esp
95 00000046 53 push ebx
96 00000047 51 push ecx
97 00000048 52 push edx
98
99 00000049 E8D8FFFFFF call _getCursorPosition
100 0000004E 89C3 mov ebx, eax
101 00000050 89D9 mov ecx, ebx
102
103 00000052 8B4508 mov eax, [ebp+8] ;al=character
104 00000055 3C0A cmp al, 10 ;newline
105 00000057 7436 jz putc_newline
106 00000059 3C09 cmp al, 9 ;tab
107 0000005B 746B jz putc_tab
108
109 0000005D D1E3 shl ebx, 1
110 0000005F 81C300800B00 add ebx, 0xb8000
111 00000065 B407 mov ah, 0x07
112 00000067 668903 mov [ebx], ax
113 0000006A 89C8 mov eax, ecx
114 0000006C 40 inc eax
115 0000006D 3DD0070000 cmp eax, 2000
116 00000072 750A jnz putc_writeit2
117 00000074 E86C010000 call _console_scroll
118 00000079 B880070000 mov eax, 2000-80
119 putc_writeit2:
120 0000007E 50 push eax
121 0000007F E87CFFFFFF call _writeCursorPosition
122 00000084 81C404000000 add esp, 4
123 0000008A E96E000000 jmp putc_done
124
125 putc_newline:
126 0000008F 89D8 mov eax, ebx ;eax = cursor position
127 00000091 BB50000000 mov ebx, 80
128 00000096 31D2 xor edx, edx
129 00000098 66F7F3 div bx ;ax=dx:ax/bx, dx=remainder
130 0000009B 66BB5000 mov bx, 80
131 0000009F 6629D3 sub bx, dx
132 000000A2 89C8 mov eax, ecx
133 000000A4 01D8 add eax, ebx ;eax = new cursor position
134 000000A6 3DD0070000 cmp eax, 2000
135 000000AB 750A jnz putc_newline_writeit2
136 000000AD E833010000 call _console_scroll
137 000000B2 B880070000 mov eax, 2000-80 ;beginning of last row
138 putc_newline_writeit2:
139 000000B7 50 push eax
140 000000B8 E843FFFFFF call _writeCursorPosition
141 000000BD 81C404000000 add esp, 4
142 000000C3 E935000000 jmp putc_done
143
144 putc_tab:
145 000000C8 89D8 mov eax, ebx ;eax = cursor position
146 000000CA BB08000000 mov ebx, 8
147 000000CF F6F3 div bl ;al=ax/bl, ah=remainder
148 000000D1 31D2 xor edx, edx
149 000000D3 88E2 mov dl, ah
150 000000D5 66BB0800 mov bx, 8
151 000000D9 6629D3 sub bx, dx
152 000000DC 89C8 mov eax, ecx
153 000000DE 01D8 add eax, ebx ;eax = new cursor position
154 000000E0 3DD0070000 cmp eax, 2000
155 000000E5 750A jnz putc_tab_writeit2
156 000000E7 E8F9000000 call _console_scroll
157 000000EC B880070000 mov eax, 2000-80 ;beginning of last row
158 putc_tab_writeit2:
159 000000F1 50 push eax
160 000000F2 E809FFFFFF call _writeCursorPosition
161 000000F7 81C404000000 add esp, 4
162
163 putc_done:
164 000000FD 5A pop edx
165 000000FE 59 pop ecx
166 000000FF 5B pop ebx
167 00000100 5D pop ebp
168
169 00000101 C3 ret
170
171
172
173 ;
174 ;void printf(char *fmt, ... )
175 ;
176 _printf:
177 00000102 55 push ebp
178 00000103 89E5 mov ebp, esp
179 00000105 60 pusha
180 00000106 8B5D08 mov ebx, [ebp+8] ;ebx = position in format string
181 00000109 89EE mov esi, ebp
182 0000010B 81C60C000000 add esi, 12 ;esi = to next variable arg
183 00000111 31C9 xor ecx, ecx ;ecx used if we encounter a '%'
184 printf_loop:
185 00000113 8A03 mov al, [ebx]
186 00000115 43 inc ebx
187 00000116 3C00 cmp al, 0
188 jzfar printf_done
189 00000118 7505 <1> jnz %%skip
190 0000011A E9C3000000 <1> jmp %1
191 <1> %%skip:
192 <1>
193 0000011F 81F901000000 cmp ecx, 1
194 00000125 7417 jz printf_special
195 00000127 3C25 cmp al, '%'
196 jzfar printf_percent
197 00000129 7505 <1> jnz %%skip
198 0000012B E9A8000000 <1> jmp %1
199 <1> %%skip:
200 <1>
201
202 00000130 50 push eax
203 00000131 E80DFFFFFF call _putc
204 00000136 81C404000000 add esp, 4
205 0000013C EBD5 jmp printf_loop
206
207 printf_special:
208 0000013E 31C9 xor ecx, ecx
209 00000140 3C64 cmp al, 'd'
210 00000142 7419 jz printf_decimal
211 00000144 3C75 cmp al, 'u'
212 00000146 7428 jz printf_decimalu
213 00000148 3C78 cmp al, 'x'
214 0000014A 7437 jz printf_hex
215 0000014C 3C25 cmp al, '%'
216 0000014E 7446 jz printf_ppercent
217 00000150 3C73 cmp al, 's'
218 00000152 7453 jz printf_string
219 00000154 3C63 cmp al, 'c'
220 00000156 7462 jz printf_char
221 00000158 E970000000 jmp printf_special_done
222
223 printf_decimal:
224 0000015D 8B06 mov eax, [esi]
225 0000015F 50 push eax
226 00000160 E8FE010000 call _putDec
227 00000165 81C404000000 add esp, 4
228 0000016B E95D000000 jmp printf_special_done
229
230 printf_decimalu:
231 00000170 8B06 mov eax, [esi]
232 00000172 50 push eax
233 00000173 E823010000 call _putDecu
234 00000178 81C404000000 add esp, 4
235 0000017E E94A000000 jmp printf_special_done
236
237 printf_hex:
238 00000183 8B06 mov eax, [esi]
239 00000185 50 push eax
240 00000186 E8A2000000 call _putHex
241 0000018B 81C404000000 add esp, 4
242 00000191 E937000000 jmp printf_special_done
243
244 printf_ppercent:
245 00000196 50 push eax
246 00000197 E8A7FEFFFF call _putc
247 0000019C 81C404000000 add esp, 4
248 000001A2 E926000000 jmp printf_special_done
249
250 printf_string:
251 000001A7 8B06 mov eax, [esi]
252 000001A9 50 push eax
253 000001AA E8CD000000 call _puts
254 000001AF 81C404000000 add esp, 4
255 000001B5 E913000000 jmp printf_special_done
256
257 printf_char:
258 000001BA 8B06 mov eax, [esi]
259 000001BC 50 push eax
260 000001BD E881FEFFFF call _putc
261 000001C2 81C404000000 add esp, 4
262 000001C8 E900000000 jmp printf_special_done
263
264 printf_special_done
265 000001CD 81C604000000 add esi, 4 ;point to next extra argument
266 000001D3 E93BFFFFFF jmp printf_loop
267
268 printf_percent:
269 000001D8 B901000000 mov ecx, 1
270 000001DD E931FFFFFF jmp printf_loop
271
272
273 printf_done:
274 000001E2 61 popa
275 000001E3 5D pop ebp
276 000001E4 C3 ret
277
278
279
280 ;
281 ;void console_scroll()
282 ;
283 _console_scroll:
284 000001E5 60 pusha
285 000001E6 BEA0800B00 mov esi, 0xb8000+160
286 000001EB BF00800B00 mov edi, 0xb8000
287 000001F0 B9C0030000 mov ecx, 960 ;(2000-80)/2
288 console_scroll_loop:
289 000001F5 AD lodsd
290 000001F6 AB stosd
291 000001F7 E2FC loop console_scroll_loop
292 000001F9 66B82007 mov ax, 0x0720
293 000001FD B950000000 mov ecx, 80
294 console_scroll_loop2:
295 00000202 66AB stosw
296 00000204 E2FC loop console_scroll_loop2
297 00000206 61 popa
298 00000207 C3 ret
299
300 ;
301 ;void console_cls()
302 ;
303 _console_cls:
304 00000208 60 pusha
305 00000209 BF00800B00 mov edi, 0xb8000
306 0000020E 66B82007 mov ax, 0x0720
307 00000212 B9D0070000 mov ecx, 2000
308 console_cls_loop:
309 00000217 66AB stosw
310 00000219 E2FC loop console_cls_loop
311 0000021B 6800000000 push dword 0
312 00000220 E8DBFDFFFF call _writeCursorPosition
313 00000225 81C404000000 add esp, 4
314 0000022B 61 popa
315 0000022C C3 ret
316
317 ;
318 ;int putHex(dword number)
319 ;
320 _putHex:
321 0000022D 55 push ebp
322 0000022E 89E5 mov ebp, esp
323 00000230 60 pusha
324 00000231 8B4508 mov eax, [ebp+8] ;eax = number to print
325 00000234 31DB xor ebx, ebx ;we have not printed a character yet
326 00000236 B908000000 mov ecx, 8 ;counter for number of characters
327
328 putHex_loop:
329 0000023B 50 push eax
330 0000023C 51 push ecx
331
332 0000023D 49 dec ecx
333 0000023E C1E102 shl ecx, 2 ;edx=counter*4 (amount to shift by)
334 00000241 D3E8 shr eax, cl
335 00000243 250F000000 and eax, 0x0F
336 00000248 80F900 cmp cl, 0
337 0000024B 7409 jz putHex_notzero ;if number is 0
338 0000024D 3C00 cmp al, 0
339 0000024F 7505 jnz putHex_notzero
340 00000251 80FB00 cmp bl, 0
341 00000254 741F jz putHex_loop_end
342 putHex_notzero:
343 00000256 B301 mov bl, 1
344 00000258 0530000000 add eax, '0'
345 0000025D 3D39000000 cmp eax, '9'
346 00000262 7605 jbe putHex_dontadjust
347 00000264 0507000000 add eax, 'A'-'9'-1
348 putHex_dontadjust:
349 00000269 50 push eax
350 0000026A E8D4FDFFFF call _putc
351 0000026F 81C404000000 add esp, 4
352
353 putHex_loop_end:
354 00000275 59 pop ecx
355 00000276 58 pop eax
356 00000277 E2C2 loop putHex_loop
357
358 00000279 61 popa
359 0000027A 5D pop ebp
360 0000027B C3 ret
361
362
363 ;
364 ;int puts(char *str)
365 ;
366 _puts:
367 0000027C 55 push ebp
368 0000027D 89E5 mov ebp, esp
369 0000027F 56 push esi
370 00000280 50 push eax
371 00000281 8B7508 mov esi, [ebp+8] ;esi = to string
372 puts_loop:
373 00000284 AC lodsb
374 00000285 3C00 cmp al, 0
375 00000287 740E jz puts_done
376 00000289 50 push eax
377 0000028A E8B4FDFFFF call _putc
378 0000028F 81C404000000 add esp, 4
379 00000295 EBED jmp puts_loop
380
381 puts_done:
382 00000297 58 pop eax
383 00000298 5E pop esi
384 00000299 5D pop ebp
385 0000029A C3 ret
386
387
388
389
390
391
392 _putDecu:
393 0000029B 55 push ebp
394 0000029C 89E5 mov ebp, esp
395 0000029E 81EC18000000 sub esp, 24
396 000002A4 C745FC01000000 mov DWORD [ebp-4], 1
397 000002AB C645FB00 mov BYTE [ebp-5], 0
398 L2:
399 000002AF 8B5508 mov edx, DWORD [ebp+8]
400 000002B2 B8CDCCCCCC mov eax, -858993459
401 000002B7 F7E2 mul edx
402 000002B9 89D0 mov eax, edx
403 000002BB C1E803 shr eax, 3
404 000002BE 3B45FC cmp eax, DWORD [ebp-4]
405 000002C1 7305 jae L4
406 000002C3 E912000000 jmp L3
407 L4:
408 000002C8 8B45FC mov eax, DWORD [ebp-4]
409 000002CB 89C2 mov edx, eax
410 000002CD C1E202 sal edx, 2
411 000002D0 01C2 add edx, eax
412 000002D2 8D0412 lea eax, [edx+edx]
413 000002D5 8945FC mov DWORD [ebp-4], eax
414 000002D8 EBD5 jmp L2
415 L3:
416 000002DA 90 nop
417 L5:
418 000002DB 817DFC01000000 cmp DWORD [ebp-4], 1
419 000002E2 7705 ja L7
420 000002E4 E959000000 jmp L6
421 L7:
422 000002E9 8B5508 mov edx, DWORD [ebp+8]
423 000002EC 89D0 mov eax, edx
424 000002EE BA00000000 mov edx, 0
425 000002F3 F775FC div DWORD [ebp-4]
426 000002F6 8945F4 mov DWORD [ebp-12], eax
427 000002F9 8A45F4 mov al, BYTE [ebp-12]
428 000002FC 8845FB mov BYTE [ebp-5], al
429 000002FF B800000000 mov eax, 0
430 00000304 8A45FB mov al, BYTE [ebp-5]
431 00000307 0FAF45FC imul eax, DWORD [ebp-4]
432 0000030B 294508 sub DWORD [ebp+8], eax
433 0000030E 8B55FC mov edx, DWORD [ebp-4]
434 00000311 B8CDCCCCCC mov eax, -858993459
435 00000316 F7E2 mul edx
436 00000318 89D0 mov eax, edx
437 0000031A C1E803 shr eax, 3
438 0000031D 8945FC mov DWORD [ebp-4], eax
439 00000320 8D45FB lea eax, [ebp-5]
440 00000323 800030 add BYTE [eax], 48
441 00000326 81EC0C000000 sub esp, 12
442 0000032C B800000000 mov eax, 0
443 00000331 8A45FB mov al, BYTE [ebp-5]
444 00000334 50 push eax
445 00000335 E809FDFFFF call _putc
446 0000033A 81C410000000 add esp, 16
447 00000340 EB99 jmp L5
448 L6:
449 00000342 81EC0C000000 sub esp, 12
450 00000348 8A4508 mov al, BYTE [ebp+8]
451 0000034B 0530000000 add eax, 48
452 00000350 25FF000000 and eax, 255
453 00000355 50 push eax
454 00000356 E8E8FCFFFF call _putc
455 0000035B 81C410000000 add esp, 16
456 00000361 C9 leave
457 00000362 C3 ret
458
459
460
461
462 _putDec:
463 00000363 55 push ebp
464 00000364 89E5 mov ebp, esp
465 00000366 81EC18000000 sub esp, 24
466 0000036C 817D0800000000 cmp DWORD [ebp+8], 0
467 00000373 7919 jns L9
468 00000375 81EC0C000000 sub esp, 12
469 0000037B 682D000000 push 45
470 00000380 E8BEFCFFFF call _putc
471 00000385 81C410000000 add esp, 16
472 0000038B F75D08 neg DWORD [ebp+8]
473 L9:
474 0000038E C745FC01000000 mov DWORD [ebp-4], 1
475 00000395 C645FB00 mov BYTE [ebp-5], 0
476 L10:
477 00000399 8B4508 mov eax, DWORD [ebp+8]
478 0000039C 3B45FC cmp eax, DWORD [ebp-4]
479 0000039F 7305 jae L12
480 000003A1 E912000000 jmp L11
481 L12:
482 000003A6 8B45FC mov eax, DWORD [ebp-4]
483 000003A9 89C2 mov edx, eax
484 000003AB C1E202 sal edx, 2
485 000003AE 01C2 add edx, eax
486 000003B0 8D0412 lea eax, [edx+edx]
487 000003B3 8945FC mov DWORD [ebp-4], eax
488 000003B6 EBE1 jmp L10
489 L11:
490 000003B8 8B55FC mov edx, DWORD [ebp-4]
491 000003BB B8CDCCCCCC mov eax, -858993459
492 000003C0 F7E2 mul edx
493 000003C2 89D0 mov eax, edx
494 000003C4 C1E803 shr eax, 3
495 000003C7 8945FC mov DWORD [ebp-4], eax
496 L13:
497 000003CA 817DFC01000000 cmp DWORD [ebp-4], 1
498 000003D1 7705 ja L15
499 000003D3 E959000000 jmp L14
500 L15:
501 000003D8 8B5508 mov edx, DWORD [ebp+8]
502 000003DB 89D0 mov eax, edx
503 000003DD BA00000000 mov edx, 0
504 000003E2 F775FC div DWORD [ebp-4]
505 000003E5 8945F4 mov DWORD [ebp-12], eax
506 000003E8 8A45F4 mov al, BYTE [ebp-12]
507 000003EB 8845FB mov BYTE [ebp-5], al
508 000003EE B800000000 mov eax, 0
509 000003F3 8A45FB mov al, BYTE [ebp-5]
510 000003F6 0FAF45FC imul eax, DWORD [ebp-4]
511 000003FA 294508 sub DWORD [ebp+8], eax
512 000003FD 8B55FC mov edx, DWORD [ebp-4]
513 00000400 B8CDCCCCCC mov eax, -858993459
514 00000405 F7E2 mul edx
515 00000407 89D0 mov eax, edx
516 00000409 C1E803 shr eax, 3
517 0000040C 8945FC mov DWORD [ebp-4], eax
518 0000040F 8D45FB lea eax, [ebp-5]
519 00000412 800030 add BYTE [eax], 48
520 00000415 81EC0C000000 sub esp, 12
521 0000041B B800000000 mov eax, 0
522 00000420 8A45FB mov al, BYTE [ebp-5]
523 00000423 50 push eax
524 00000424 E81AFCFFFF call _putc
525 00000429 81C410000000 add esp, 16
526 0000042F EB99 jmp L13
527 L14:
528 00000431 81EC0C000000 sub esp, 12
529 00000437 8A4508 mov al, BYTE [ebp+8]
530 0000043A 0530000000 add eax, 48
531 0000043F 25FF000000 and eax, 255
532 00000444 50 push eax
533 00000445 E8F9FBFFFF call _putc
534 0000044A 81C410000000 add esp, 16
535 00000450 C9 leave
536 00000451 C3 ret
537
538
539
540

144
lst/LDout.doc
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@ -1,144 +0,0 @@
Archive member included because of file (symbol)
.\lib\hlibc.a(io_a.o) kernel.o (_putc)
Allocating common symbols
Common symbol size file
_video_mode 0x100 kernel.o
_vid_ptr16 0x10 kernel.o
_kbdBuffer 0x100 kernel.o
_vid_ptr32 0x10 kernel.o
_mouse_inbuffer 0x10 kernel.o
_vid_ptr24 0x10 kernel.o
Memory Configuration
Name Origin Length Attributes
*default* 0x00000000 0xffffffff
Linker script and memory map
.text 0x00100000 0x3000
0x00100000 code = .
0x00100000 _code = .
0x00100000 __code = .
*(.text)
.text 0x00100000 0x2d0 ks.o
0x00100000 start
.text 0x001002d0 0x24e0 kernel.o
0x00100b88 _kbdGetKey
0x001017f4 _pic1_mask
0x001016b2 _free
0x0010114a _mm_new_pageblock_page
0x00101024 _mm_palloc
0x001011c6 _mm_pfree
0x00101236 _mm_lastpageblockentry
0x00101d18 _video_rectf
0x00100f8e _mm_init_pageblockpage
0x001018a4 _kernel_size
0x001002d0 _mouse_init
0x00101fbc _k_init
0x001004b0 _SCAN2ASCII
0x00101862 _eoi
0x00100c1e _kbd_resetLEDs
0x00101e6e _video_psetp
0x00101818 _pic2_mask
0x001018b4 _video_init
0x001016fc _enable_ints
0x00101448 _vmm_init
0x00101840 _restart
0x00101106 _mm_freeentries
0x00100c76 _mm_init
0x00100b0c _switchCase
0x001005cc _isr_keyboard
0x001019da _video_horiz
0x001012a8 _mm_freemem
0x001016b8 _outportb
0x00100366 _isr_mouse
0x0010187a _eoi2
0x001016ce _outportw
0x00101bd4 _video_rect
0x001016ac _malloc
0x00102732 _isr
0x00100530 _SCAN2ASCIISHIFT
0x00101ad0 _video_vert
0x00101708 _remap_pics
0x00100bda _kbdWaitKey
0x00101266 _mm_nextpageblockentry
0x001012f8 _mm_coalesce
0x001016dc _inportb
0x0010185a _halt
0x00101702 _disable_ints
0x00101e44 _video_pset
.text 0x001027b0 0x20 asmfuncs.o
0x001027ca _read_cr3
0x001027b0 _write_cr0
0x001027bf _write_cr3
0x001027bb _read_cr0
.text 0x001027d0 0x454 .\lib\hlibc.a(io_a.o)
0x00102813 _putc
0x001029fd _putHex
0x00102a4c _puts
0x00102a6b _putDecu
0x001027d0 _writeCursorPosition
0x001029b5 _console_scroll
0x001029d8 _console_cls
0x00102b33 _putDec
0x001027f6 _getCursorPosition
0x001028d2 _printf
0x00103000 . = ALIGN (0x1000)
*fill* 0x00102c24 0x3dc 00
.data 0x00103000 0x1000
0x00103000 data = .
0x00103000 _data = .
0x00103000 __data = .
*(.data)
.data 0x00103000 0x40 kernel.o
0x00103004 _mouse_y
0x00103018 _kbdExt
0x00103008 _mouse_bytesRead
0x0010300d _kbdAscii
0x00103028 _vmm_PDBR
0x00103000 _mouse_x
0x00103019 _kbdExt2
0x0010301a _ackReason
0x0010301c _first_pageblock
0x00103020 _mm_totalmem
0x0010302c _vmm_first_virtual_address
0x00103010 _kbdBufferStart
0x0010300e _kbdScan
0x00103014 _kbdBufferLen
0x0010300c _kbdFlags
0x00103030 _timer
0x00103024 _mm_highestAddress
0x00104000 . = ALIGN (0x1000)
*fill* 0x00103040 0xfc0 00
.bss 0x00104000 0x240
0x00104000 bss = .
0x00104000 _bss = .
0x00104000 __bss = .
*(.bss)
0x00104000 . = ALIGN (0x1000)
COMMON 0x00104000 0x240 kernel.o
0x0 (size before relaxing)
0x00104000 _video_mode
0x00104100 _vid_ptr16
0x00104110 _kbdBuffer
0x00104210 _vid_ptr32
0x00104220 _mouse_inbuffer
0x00104230 _vid_ptr24
0x00104240 end = .
0x00104240 _end = .
0x00104240 __end = .
LOAD ks.o
LOAD kernel.o
LOAD asmfuncs.o
LOAD .\lib\hlibc.a
OUTPUT(kernel.bin binary)
.comment 0x00104240 0x10
.comment 0x00104240 0x10 kernel.o

42
lst/asmfuncs.lst
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@ -1,42 +0,0 @@
1 ; asmfuncs.asm
2 ; Josh Holtrop
3 ; 10/23/03
4
5 [global _write_cr0]
6 [global _read_cr0]
7 [global _write_cr3]
8 [global _read_cr3]
9
10 ;extern dword write_cr0(dword cr0);
11 _write_cr0:
12 00000000 55 push ebp
13 00000001 89E5 mov ebp, esp
14 00000003 8B4508 mov eax, [ebp+8]
15 00000006 0F22C0 mov cr0, eax
16 00000009 5D pop ebp
17 0000000A C3 ret
18
19 ;extern dword read_cr0();
20 _read_cr0:
21 0000000B 0F20C0 mov eax, cr0;
22 0000000E C3 ret
23
24
25 ;extern dword write_cr3(dword cr3);
26 _write_cr3:
27 0000000F 55 push ebp
28 00000010 89E5 mov ebp, esp
29 00000012 8B4508 mov eax, [ebp+8]
30 00000015 0F22D8 mov cr3, eax
31 00000018 5D pop ebp
32 00000019 C3 ret
33
34 ;extern dword read_cr3();
35 _read_cr3:
36 0000001A 0F20D8 mov eax, cr3;
37 0000001D C3 ret
38
39
40
41
42

392
lst/kernel.lst
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@ -1,392 +0,0 @@
1
2 %include "bootdef.inc"
3 <1>
4 <1> %define VERSION "0.1.2" ;HOS version
5 <1>
6 <1> %define BOOT_FAT_SEG 0x07E0 ;right after boot sector
7 <1> %define BOOT_ROOT_SEG 0x0900 ;right after FAT
8 <1> %define BOOT_KERNEL_SEG 0x0AC0 ;right after ROOT_DIR
9 <1> %define BOOT_STAGE2_SEG 0x0B00 ;right after KERNEL_SEG
10 <1> %define BOOT_STAGE2_ADD 0xB000 ;address of stage2 to jump to, org at
11 <1> %define BOOT_KERNEL_ADD 0x100000 ;final pmode kernel destination - physical
12 <1> %define BOOT_RD_ADD 0x200000 ;2mb for ram disk
13 <1>
14 <1> %define BOOT_DATA_SEG 0x9000 ;data gathered by stage2 loader goes here
15 <1>
16 <1> %define BOOT_HASRD 0x0000 ;1
17 <1> %define BOOT_VESA 0x0002 ;2 - 0 for console, otherwise VESA mode
18 <1> %define BOOT_VESA_OEM 0x0004 ;258 - null-terminated OEM identification string
19 <1> %define BOOT_VESA_VBE 0x0106 ;512 - copy of VESA VBEInfoBlock
20 <1> %define BOOT_VESA_INFO 0x0306 ;256 - copy of VESA ModeInfoBlock for selected mode
21 <1> %define BOOT_MEMENTRIES 0x040A ;4 - dword = number of memmap entries
22 <1> %define BOOT_MEMMAP 0x2000 ;? - memory map information
23 <1>
24 <1>
25 <1>
26 <1> %define BOOT_DRIVE 0x7C24 ;1 - boot drive
27 <1>
28 <1>
29
30 %define GDT 0x140000
31 %define IDT 0x150000
32
33 [global start]
34 [extern _isr]
35 [extern _k_init]
36
37 bits 32
38
39 start:
40 00000000 FA cli ;if they weren't already off
41 00000001 BF00001400 mov edi, GDT
42 00000006 BE[7F000000] mov esi, gdt
43 0000000B B948000000 mov ecx, gdt_end-gdt
44 copy_gdt:
45 00000010 AC lodsb
46 00000011 AA stosb
47 00000012 E2FC loop copy_gdt
48
49 00000014 BF00001500 mov edi, IDT ;destination
50 00000019 BE[CD000000] mov esi, isr_0 ;address of isr0
51 0000001E BA0A000000 mov edx, isr_1-isr_0 ;distance between isr labels
52 00000023 B932000000 mov ecx, 50 ;number of isrlabels
53 fill_idt:
54 00000028 89F3 mov ebx, esi
55 0000002A 6689F0 mov ax, si
56 0000002D 66AB stosw ;0 offset 15:0
57 0000002F 66B80800 mov ax, KERNEL_CODE
58 00000033 66AB stosw ;2 selector 15:0
59 00000035 66B8008E mov ax, 0x8E00
60 00000039 66AB stosw ;4 [P][DPL][0][TYPE][0][0][0][0][0][0][0][0]
61 0000003B C1EE10 shr esi, 16
62 0000003E 6689F0 mov ax, si
63 00000041 66AB stosw ;6 offset 31:16
64 00000043 89DE mov esi, ebx
65 00000045 01D6 add esi, edx
66 00000047 E2DF loop fill_idt
67
68 00000049 0F0115[79000000] lgdt [gdtr] ;load gdt
69 00000050 EA[57000000]0800 jmp KERNEL_CODE:newgdtcontinue
70 newgdtcontinue:
71 00000057 66B81000 mov ax, KERNEL_DATA
72 0000005B 8EC0 mov es, ax
73 0000005D 8ED8 mov ds, ax
74 0000005F 8EE8 mov gs, ax
75 00000061 8EE0 mov fs, ax
76 00000063 8ED0 mov ss, ax
77 00000065 BCFCFF1F00 mov esp, 0x1ffffc ;stack just under 2mb, moves downward
78 0000006A 0F011D[C7000000] lidt [idtr] ;load idt
79
80 00000071 E8(00000000) call _k_init
81 00000076 F4 hlt ;halt processor when k_init is done
82 00000077 EBFE jmp $ ;shouldn't get here...
83
84 %include "gdt.inc"
85 <1>
86 <1>
87 <1> gdtr:
88 00000079 4700 <1> dw gdt_end-gdt-1
89 0000007B 00001400 <1> dd GDT
90 <1> gdt:
91 0000007F 00000000 <1> dd 0
92 00000083 00000000 <1> dd 0
93 <1> KERNEL_CODE equ $-gdt
94 00000087 FFFF <1> dw 0xffff ;limit 15:0
95 00000089 0000 <1> dw 0x0000 ;base 15:0
96 0000008B 00 <1> db 0x00 ;base 23:16
97 0000008C 9A <1> db 0x9A ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
98 0000008D CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
99 0000008E 00 <1> db 0x00 ;base 31:24
100 <1> KERNEL_DATA equ $-gdt
101 0000008F FFFF <1> dw 0xffff ;limit 15:0
102 00000091 0000 <1> dw 0x0000 ;base 15:0
103 00000093 00 <1> db 0x00 ;base 23:16
104 00000094 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
105 00000095 CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
106 00000096 00 <1> db 0x00 ;base 31:24
107 <1> VESA_CODE equ $-gdt
108 00000097 FFFF <1> dw 0xffff ;limit 15:0
109 00000099 0000 <1> dw 0x0000 ;base 15:0
110 0000009B 00 <1> db 0x00 ;base 23:16
111 0000009C 9A <1> db 0x9A ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
112 0000009D 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
113 0000009E 00 <1> db 0x00 ;base 31:24
114 <1> VESA_DATA equ $-gdt
115 0000009F FFFF <1> dw 0xffff ;limit 15:0
116 000000A1 0000 <1> dw 0x0000 ;base 15:0
117 000000A3 00 <1> db 0x00 ;base 23:16
118 000000A4 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
119 000000A5 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
120 000000A6 00 <1> db 0x00 ;base 31:24
121 <1> VIDEO_TEXT equ $-gdt
122 000000A7 FF7F <1> dw 0x7FFF ;limit 15:0
123 000000A9 0080 <1> dw 0x8000 ;base 15:0
124 000000AB 0B <1> db 0x0B ;base 23:16
125 000000AC 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
126 000000AD 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
127 000000AE 00 <1> db 0x00 ;base 31:24
128 <1> VIDEO_GRAPHICS equ $-gdt
129 000000AF FFFF <1> dw 0xFFFF ;limit 15:0
130 000000B1 0000 <1> dw 0x0000 ;base 15:0
131 000000B3 0A <1> db 0x0A ;base 23:16
132 000000B4 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
133 000000B5 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
134 000000B6 00 <1> db 0x00 ;base 31:24
135 <1> USER_CODE equ $-gdt
136 000000B7 FFFF <1> dw 0xffff ;limit 15:0
137 000000B9 0000 <1> dw 0x0000 ;base 15:0
138 000000BB 00 <1> db 0x00 ;base 23:16
139 000000BC FA <1> db 0xFA ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
140 000000BD CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
141 000000BE 00 <1> db 0x00 ;base 31:24
142 <1> USER_DATA equ $-gdt
143 000000BF FFFF <1> dw 0xffff ;limit 15:0
144 000000C1 0000 <1> dw 0x0000 ;base 15:0
145 000000C3 00 <1> db 0x00 ;base 23:16
146 000000C4 F2 <1> db 0xF2 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
147 000000C5 CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
148 000000C6 00 <1> db 0x00 ;base 31:24
149 <1> gdt_end:
150 <1>
151 <1>
152 <1>
153 %include "idt.inc"
154 <1>
155 <1> idtr:
156 000000C7 8F01 <1> dw 50*8-1 ;size of idt
157 000000C9 00001500 <1> dd IDT ;address of idt
158 <1>
159 <1>
160 <1> %macro isr_label 1
161 <1> isr_%1:
162 <1> mov eax, %1
163 <1> jmp isr_main
164 <1> %endmacro
165 <1>
166 <1> isr_label 0
167 <2> isr_%1:
168 000000CD B800000000 <2> mov eax, %1
169 000000D2 E9EA010000 <2> jmp isr_main
170 <1> isr_label 1
171 <2> isr_%1:
172 000000D7 B801000000 <2> mov eax, %1
173 000000DC E9E0010000 <2> jmp isr_main
174 <1> isr_label 2
175 <2> isr_%1:
176 000000E1 B802000000 <2> mov eax, %1
177 000000E6 E9D6010000 <2> jmp isr_main
178 <1> isr_label 3
179 <2> isr_%1:
180 000000EB B803000000 <2> mov eax, %1
181 000000F0 E9CC010000 <2> jmp isr_main
182 <1> isr_label 4
183 <2> isr_%1:
184 000000F5 B804000000 <2> mov eax, %1
185 000000FA E9C2010000 <2> jmp isr_main
186 <1> isr_label 5
187 <2> isr_%1:
188 000000FF B805000000 <2> mov eax, %1
189 00000104 E9B8010000 <2> jmp isr_main
190 <1> isr_label 6
191 <2> isr_%1:
192 00000109 B806000000 <2> mov eax, %1
193 0000010E E9AE010000 <2> jmp isr_main
194 <1> isr_label 7
195 <2> isr_%1:
196 00000113 B807000000 <2> mov eax, %1
197 00000118 E9A4010000 <2> jmp isr_main
198 <1> isr_label 8
199 <2> isr_%1:
200 0000011D B808000000 <2> mov eax, %1
201 00000122 E99A010000 <2> jmp isr_main
202 <1> isr_label 9
203 <2> isr_%1:
204 00000127 B809000000 <2> mov eax, %1
205 0000012C E990010000 <2> jmp isr_main
206 <1> isr_label 10
207 <2> isr_%1:
208 00000131 B80A000000 <2> mov eax, %1
209 00000136 E986010000 <2> jmp isr_main
210 <1> isr_label 11
211 <2> isr_%1:
212 0000013B B80B000000 <2> mov eax, %1
213 00000140 E97C010000 <2> jmp isr_main
214 <1> isr_label 12
215 <2> isr_%1:
216 00000145 B80C000000 <2> mov eax, %1
217 0000014A E972010000 <2> jmp isr_main
218 <1> isr_label 13
219 <2> isr_%1:
220 0000014F B80D000000 <2> mov eax, %1
221 00000154 E968010000 <2> jmp isr_main
222 <1> isr_label 14
223 <2> isr_%1:
224 00000159 B80E000000 <2> mov eax, %1
225 0000015E E95E010000 <2> jmp isr_main
226 <1> isr_label 15
227 <2> isr_%1:
228 00000163 B80F000000 <2> mov eax, %1
229 00000168 E954010000 <2> jmp isr_main
230 <1> isr_label 16
231 <2> isr_%1:
232 0000016D B810000000 <2> mov eax, %1
233 00000172 E94A010000 <2> jmp isr_main
234 <1> isr_label 17
235 <2> isr_%1:
236 00000177 B811000000 <2> mov eax, %1
237 0000017C E940010000 <2> jmp isr_main
238 <1> isr_label 18
239 <2> isr_%1:
240 00000181 B812000000 <2> mov eax, %1
241 00000186 E936010000 <2> jmp isr_main
242 <1> isr_label 19
243 <2> isr_%1:
244 0000018B B813000000 <2> mov eax, %1
245 00000190 E92C010000 <2> jmp isr_main
246 <1> isr_label 20
247 <2> isr_%1:
248 00000195 B814000000 <2> mov eax, %1
249 0000019A E922010000 <2> jmp isr_main
250 <1> isr_label 21
251 <2> isr_%1:
252 0000019F B815000000 <2> mov eax, %1
253 000001A4 E918010000 <2> jmp isr_main
254 <1> isr_label 22
255 <2> isr_%1:
256 000001A9 B816000000 <2> mov eax, %1
257 000001AE E90E010000 <2> jmp isr_main
258 <1> isr_label 23
259 <2> isr_%1:
260 000001B3 B817000000 <2> mov eax, %1
261 000001B8 E904010000 <2> jmp isr_main
262 <1> isr_label 24
263 <2> isr_%1:
264 000001BD B818000000 <2> mov eax, %1
265 000001C2 E9FA000000 <2> jmp isr_main
266 <1> isr_label 25
267 <2> isr_%1:
268 000001C7 B819000000 <2> mov eax, %1
269 000001CC E9F0000000 <2> jmp isr_main
270 <1> isr_label 26
271 <2> isr_%1:
272 000001D1 B81A000000 <2> mov eax, %1
273 000001D6 E9E6000000 <2> jmp isr_main
274 <1> isr_label 27
275 <2> isr_%1:
276 000001DB B81B000000 <2> mov eax, %1
277 000001E0 E9DC000000 <2> jmp isr_main
278 <1> isr_label 28
279 <2> isr_%1:
280 000001E5 B81C000000 <2> mov eax, %1
281 000001EA E9D2000000 <2> jmp isr_main
282 <1> isr_label 29
283 <2> isr_%1:
284 000001EF B81D000000 <2> mov eax, %1
285 000001F4 E9C8000000 <2> jmp isr_main
286 <1> isr_label 30
287 <2> isr_%1:
288 000001F9 B81E000000 <2> mov eax, %1
289 000001FE E9BE000000 <2> jmp isr_main
290 <1> isr_label 31
291 <2> isr_%1:
292 00000203 B81F000000 <2> mov eax, %1
293 00000208 E9B4000000 <2> jmp isr_main
294 <1> isr_label 32
295 <2> isr_%1:
296 0000020D B820000000 <2> mov eax, %1
297 00000212 E9AA000000 <2> jmp isr_main
298 <1> isr_label 33
299 <2> isr_%1:
300 00000217 B821000000 <2> mov eax, %1
301 0000021C E9A0000000 <2> jmp isr_main
302 <1> isr_label 34
303 <2> isr_%1:
304 00000221 B822000000 <2> mov eax, %1
305 00000226 E996000000 <2> jmp isr_main
306 <1> isr_label 35
307 <2> isr_%1:
308 0000022B B823000000 <2> mov eax, %1
309 00000230 E98C000000 <2> jmp isr_main
310 <1> isr_label 36
311 <2> isr_%1:
312 00000235 B824000000 <2> mov eax, %1
313 0000023A E982000000 <2> jmp isr_main
314 <1> isr_label 37
315 <2> isr_%1:
316 0000023F B825000000 <2> mov eax, %1
317 00000244 E978000000 <2> jmp isr_main
318 <1> isr_label 38
319 <2> isr_%1:
320 00000249 B826000000 <2> mov eax, %1
321 0000024E E96E000000 <2> jmp isr_main
322 <1> isr_label 39
323 <2> isr_%1:
324 00000253 B827000000 <2> mov eax, %1
325 00000258 E964000000 <2> jmp isr_main
326 <1> isr_label 40
327 <2> isr_%1:
328 0000025D B828000000 <2> mov eax, %1
329 00000262 E95A000000 <2> jmp isr_main
330 <1> isr_label 41
331 <2> isr_%1:
332 00000267 B829000000 <2> mov eax, %1
333 0000026C E950000000 <2> jmp isr_main
334 <1> isr_label 42
335 <2> isr_%1:
336 00000271 B82A000000 <2> mov eax, %1
337 00000276 E946000000 <2> jmp isr_main
338 <1> isr_label 43
339 <2> isr_%1:
340 0000027B B82B000000 <2> mov eax, %1
341 00000280 E93C000000 <2> jmp isr_main
342 <1> isr_label 44
343 <2> isr_%1:
344 00000285 B82C000000 <2> mov eax, %1
345 0000028A E932000000 <2> jmp isr_main
346 <1> isr_label 45
347 <2> isr_%1:
348 0000028F B82D000000 <2> mov eax, %1
349 00000294 E928000000 <2> jmp isr_main
350 <1> isr_label 46
351 <2> isr_%1:
352 00000299 B82E000000 <2> mov eax, %1
353 0000029E E91E000000 <2> jmp isr_main
354 <1> isr_label 47
355 <2> isr_%1:
356 000002A3 B82F000000 <2> mov eax, %1
357 000002A8 E914000000 <2> jmp isr_main
358 <1> isr_label 48
359 <2> isr_%1:
360 000002AD B830000000 <2> mov eax, %1
361 000002B2 E90A000000 <2> jmp isr_main
362 <1> isr_label 49
363 <2> isr_%1:
364 000002B7 B831000000 <2> mov eax, %1
365 000002BC E900000000 <2> jmp isr_main
366 <1>
367 <1> isr_main:
368 000002C1 60 <1> pusha
369 000002C2 1E <1> push ds
370 000002C3 06 <1> push es
371 <1>
372 000002C4 50 <1> push eax
373 <1>
374 000002C5 E8(00000000) <1> call _isr
375 <1>
376 000002CA 58 <1> pop eax
377 <1>
378 000002CB 07 <1> pop es
379 000002CC 1F <1> pop ds
380 000002CD 61 <1> popa
381 <1>
382 000002CE CF <1> iret
383 <1>
384 <1>
385 <1>
386 <1>
387 <1>
388 <1>
389 <1>
390
391
392

256
lst/stage1.lst
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@ -1,256 +0,0 @@
1
2 %include "bootdef.inc"
3 <1>
4 <1> %define VERSION "0.1.2" ;HOS version
5 <1>
6 <1> %define BOOT_FAT_SEG 0x07E0 ;right after boot sector
7 <1> %define BOOT_ROOT_SEG 0x0900 ;right after FAT
8 <1> %define BOOT_KERNEL_SEG 0x0AC0 ;right after ROOT_DIR
9 <1> %define BOOT_STAGE2_SEG 0x0B00 ;right after KERNEL_SEG
10 <1> %define BOOT_STAGE2_ADD 0xB000 ;address of stage2 to jump to, org at
11 <1> %define BOOT_KERNEL_ADD 0x100000 ;final pmode kernel destination - physical
12 <1> %define BOOT_RD_ADD 0x200000 ;2mb for ram disk
13 <1>
14 <1> %define BOOT_DATA_SEG 0x9000 ;data gathered by stage2 loader goes here
15 <1>
16 <1> %define BOOT_HASRD 0x0000 ;1
17 <1> %define BOOT_VESA 0x0002 ;2 - 0 for console, otherwise VESA mode
18 <1> %define BOOT_VESA_OEM 0x0004 ;258 - null-terminated OEM identification string
19 <1> %define BOOT_VESA_VBE 0x0106 ;512 - copy of VESA VBEInfoBlock
20 <1> %define BOOT_VESA_INFO 0x0306 ;256 - copy of VESA ModeInfoBlock for selected mode
21 <1> %define BOOT_MEMENTRIES 0x040A ;4 - dword = number of memmap entries
22 <1> %define BOOT_MEMMAP 0x2000 ;? - memory map information
23 <1>
24 <1>
25 <1>
26 <1> %define BOOT_DRIVE 0x7C24 ;1 - boot drive
27 <1>
28 <1>
29
30 [bits 16]
31
32 org 0x7c00
33
34 00000000 EB3C jmp short start
35
36 ; --------------------------------------------------
37 ; data portion of the "DOS BOOT RECORD"
38 ; ----------------------------------------------------------------------
39 00000002 90 brINT13Flag DB 90H ; 0002h - 0EH for INT13 AH=42 READ
40 00000003 4D53444F53352E30 brOEM DB 'MSDOS5.0' ; 0003h - OEM ID - Windows 95B
41 0000000B 0002 brBPS DW 512 ; 000Bh - Bytes per sector
42 0000000D 01 brSPC DB 1 ; 000Dh - Sector per cluster
43 0000000E 0100 brSc_b4_fat DW 1 ; 000Eh - Reserved sectors
44 00000010 02 brFATs DB 2 ; 0010h - FAT copies
45 00000011 E000 brRootEntries DW 0E0H ; 0011h - Root directory entries
46 00000013 400B brSectorCount DW 2880 ; 0013h - Sectors in volume, < 32MB
47 00000015 F0 brMedia DB 240 ; 0015h - Media descriptor
48 00000016 0900 brSPF DW 9 ; 0016h - Sectors per FAT
49 00000018 1200 brSc_p_trk DW 18 ; 0018h - Sectors per head/track
50 0000001A 0200 brHPC DW 2 ; 001Ah - Heads per cylinder
51 0000001C 00000000 brSc_b4_prt DD 0 ; 001Ch - Hidden sectors
52 00000020 00000000 brSectors DD 0 ; 0020h - Total number of sectors
53 00000024 00 brDrive DB 0 ; 0024h - Physical drive no.
54 00000025 00 DB 0 ; 0025h - Reserved (FAT32)
55 00000026 29 DB 29H ; 0026h - Extended boot record sig (FAT32)
56 00000027 EA184440 brSerialNum DD 404418EAH ; 0027h - Volume serial number
57 0000002B 484F5320302E312E31- brLabel DB 'HOS 0.1.1 ' ; 002Bh - Volume label
58 00000034 2020
59 00000036 4641543132202020 brFSID DB 'FAT12 ' ; 0036h - File System ID
60 ;------------------------------------------------------------------------
61
62 start:
63 0000003E EA[4300]0000 jmp 0:jmphere ;ensure that cs=0 and ip=0x7c...
64 jmphere:
65 ;dl=drive number, save it!
66 00000043 31C0 xor ax, ax
67 00000045 8ED8 mov ds, ax
68 00000047 8816[2400] mov [brDrive], dl
69 0000004B FA cli
70 0000004C 8ED0 mov ss, ax
71 0000004E BCFE7B mov sp, 0x7Bfe ;right under boot sector
72 00000051 FB sti
73
74 00000052 B800B8 mov ax, 0xb800
75 00000055 8ED8 mov ds, ax
76 00000057 8EC0 mov es, ax
77
78 00000059 31FF xor di, di
79 0000005B B80007 mov ax, 0x0700
80 0000005E B9D007 mov cx, 2000
81 cls:
82 00000061 AB stosw
83 00000062 E2FD loop cls
84
85 enable_a20:
86 00000064 E464 in al, 0x64
87 00000066 A802 test al, 2
88 00000068 75FA jnz enable_a20
89 0000006A B0D1 mov al, 0xD1
90 0000006C E664 out 0x64, al
91 0000006E E464 ea20_2: in al, 0x64
92 00000070 83E002 and ax, byte 2
93 00000073 75F9 jnz ea20_2
94 00000075 B0DF mov al, 0xDF
95 00000077 E660 out 0x60, al
96
97 unreal:
98 00000079 31C0 xor ax, ax
99 0000007B 8EC0 mov es, ax
100 0000007D 8ED8 mov ds, ax
101
102 0000007F 0F0116[5E01] lgdt [gdtr] ;load gdt
103 00000084 FA cli
104 00000085 06 push es
105 00000086 1E push ds ;save segment values
106 00000087 0F20C3 mov ebx, cr0
107 0000008A FEC3 inc bl
108 0000008C 0F22C3 mov cr0, ebx ;pmode!
109 0000008F B80800 mov ax, KERNEL_DATA
110 00000092 8EC0 mov es, ax
111 00000094 8ED8 mov ds, ax ;load segment limits
112 00000096 FECB dec bl
113 00000098 0F22C3 mov cr0, ebx ;back to real mode!
114 0000009B 1F pop ds
115 0000009C 07 pop es ;segments back, with 4gb limits!
116 0000009D FB sti
117
118 ;now lets read in the FAT and root directory so we can search for the kernel file...
119 0000009E B80902 mov ax, 0x0209 ;FAT1
120 000000A1 B90200 mov cx, 0x0002
121 000000A4 30F6 xor dh, dh
122 000000A6 8A16[2400] mov dl, [brDrive]
123 000000AA BBE007 mov bx, BOOT_FAT_SEG
124 000000AD 8EC3 mov es, bx
125 000000AF 31DB xor bx, bx
126 000000B1 CD13 int 0x13
127
128 000000B3 B80E02 mov ax, 0x020E ;root directory
129 000000B6 B90200 mov cx, 0x0002 ;cyl/sect
130 000000B9 B601 mov dh, 0x01 ;head
131 000000BB 8A16[2400] mov dl, [brDrive] ;drive
132 000000BF BB0009 mov bx, BOOT_ROOT_SEG
133 000000C2 8EC3 mov es, bx
134 000000C4 31DB xor bx, bx
135 000000C6 CD13 int 0x13
136
137 ;k now read root directory
138 000000C8 BB0009 mov bx, BOOT_ROOT_SEG
139 000000CB 8EDB mov ds, bx
140 000000CD 31F6 xor si, si ;k now ds:si points to beginning of root directory
141 000000CF 8EC6 mov es, si
142 000000D1 B9E000 mov cx, 224 ;max root entries
143 loop_compare:
144 000000D4 BF[7401] mov di, stage2
145 000000D7 51 push cx
146 000000D8 56 push si ;save pointer to root dir entry
147 000000D9 B90B00 mov cx, 11
148 loop_name:
149 000000DC A6 cmpsb
150 000000DD E1FD loopz loop_name
151 000000DF 7505 jnz goon ;cx didn't get to zero, bad file
152 000000E1 5E pop si
153 000000E2 59 pop cx
154 000000E3 E90A00 jmp found_file ;good file, ds:si points to start of root directory entry
155 goon:
156 000000E6 5E pop si
157 000000E7 59 pop cx
158 000000E8 81C62000 add si, 32
159 000000EC E2E6 loop loop_compare
160
161 error:
162 000000EE EBFE jmp $ ;halt! no kernel file found!
163
164 found_file: ;ds:si points to root dir entry
165 000000F0 31C0 xor ax, ax
166 000000F2 8EE8 mov gs, ax
167 000000F4 B8000B mov ax, BOOT_STAGE2_SEG
168 000000F7 8EC0 mov es, ax
169
170 000000F9 3E8B441A mov ax, [ds:si+26]
171 000000FD BBE007 mov bx, BOOT_FAT_SEG
172 00000100 8EDB mov ds, bx ;ds points to beginning of FAT
173 00000102 31FF xor di, di
174
175 readstage2_loop:
176 00000104 3DF70F cmp ax, 0xff7
177 00000107 7F37 jg readstage2_done
178 00000109 47 inc di
179 0000010A 50 push ax
180 0000010B E83700 call getCHSfromCluster
181 0000010E B80102 mov ax, 0x0201
182 00000111 658A16247C mov dl, [gs:BOOT_DRIVE]
183 00000116 31DB xor bx, bx
184 00000118 CD13 int 0x13
185 0000011A 8CC3 mov bx, es
186 0000011C 81C32000 add bx, 0x0020
187 00000120 8EC3 mov es, bx
188 00000122 58 pop ax ;current logical cluster #
189
190 00000123 89C1 mov cx, ax ;cx=logical cluster
191 00000125 BA0300 mov dx, 3
192 00000128 F7E2 mul dx
193 0000012A D1E8 shr ax, 1 ;ax=logical cluster * 3 / 2
194 0000012C 89C6 mov si, ax
195 0000012E F6C101 test cl, 1 ;is bit0 set?
196 00000131 7507 jnz odd_cluster
197 even_cluster:
198 00000133 AD lodsw
199 00000134 25FF0F and ax, 0x0fff
200 00000137 E90400 jmp got_cluster
201 odd_cluster:
202 0000013A AD lodsw
203 0000013B C1E804 shr ax, 4
204 got_cluster:
205 0000013E EBC4 jmp readstage2_loop
206
207 readstage2_done:
208
209 00000140 EA00B00000 jmp 0:BOOT_STAGE2_ADD
210
211 ;------------------------------------------------------
212 getCHSfromCluster:
213 ;input: ax=lba of sector on floppy (0-2879)
214 00000145 051F00 add ax, 31 ;convert logical cluster# to lba#
215 00000148 31D2 xor dx, dx ;lba->chs
216 0000014A BB1200 mov bx, 18
217 0000014D F7F3 div bx
218 0000014F 42 inc dx
219 00000150 88D1 mov cl, dl ;sector# (1-18)
220 00000152 31D2 xor dx, dx
221 00000154 BB0200 mov bx, 2
222 00000157 F7F3 div bx
223 00000159 88C5 mov ch, al ;cylinder# (0-79)
224 0000015B 88D6 mov dh, dl ;head# (0-1)
225 0000015D C3 ret
226
227
228 ;-------------------------------------------------------
229 gdtr:
230 0000015E 0F00 dw gdt_end-gdt-1
231 00000160 [64010000] dd gdt
232 gdt:
233 00000164 00000000 dd 0
234 00000168 00000000 dd 0
235
236 KERNEL_DATA equ $-gdt
237 0000016C FF db 0xff ;segment 16 = 4gb data
238 0000016D FF db 0xff
239 0000016E 00 db 0x00
240 0000016F 00 db 0x00
241 00000170 00 db 0x00
242 00000171 92 db 0x92
243 00000172 CF db 0xcf ;cf
244 00000173 00 db 0x00
245
246 gdt_end:
247
248
249
250 00000174 535441474532202042- stage2: db "STAGE2 BIN"
251 0000017D 494E
252
253 0000017F 00<rept> times 510-($-$$) db 0
254
255 000001FE 55AA db 0x55, 0xaa
256

988
lst/stage2.lst
View File

@ -1,988 +0,0 @@
1
2 %include "bootdef.inc"
3 <1>
4 <1> %define VERSION "0.1.2" ;HOS version
5 <1>
6 <1> %define BOOT_FAT_SEG 0x07E0 ;right after boot sector
7 <1> %define BOOT_ROOT_SEG 0x0900 ;right after FAT
8 <1> %define BOOT_KERNEL_SEG 0x0AC0 ;right after ROOT_DIR
9 <1> %define BOOT_STAGE2_SEG 0x0B00 ;right after KERNEL_SEG
10 <1> %define BOOT_STAGE2_ADD 0xB000 ;address of stage2 to jump to, org at
11 <1> %define BOOT_KERNEL_ADD 0x100000 ;final pmode kernel destination - physical
12 <1> %define BOOT_RD_ADD 0x200000 ;2mb for ram disk
13 <1>
14 <1> %define BOOT_DATA_SEG 0x9000 ;data gathered by stage2 loader goes here
15 <1>
16 <1> %define BOOT_HASRD 0x0000 ;1
17 <1> %define BOOT_VESA 0x0002 ;2 - 0 for console, otherwise VESA mode
18 <1> %define BOOT_VESA_OEM 0x0004 ;258 - null-terminated OEM identification string
19 <1> %define BOOT_VESA_VBE 0x0106 ;512 - copy of VESA VBEInfoBlock
20 <1> %define BOOT_VESA_INFO 0x0306 ;256 - copy of VESA ModeInfoBlock for selected mode
21 <1> %define BOOT_MEMENTRIES 0x040A ;4 - dword = number of memmap entries
22 <1> %define BOOT_MEMMAP 0x2000 ;? - memory map information
23 <1>
24 <1>
25 <1>
26 <1> %define BOOT_DRIVE 0x7C24 ;1 - boot drive
27 <1>
28 <1>
29
30 %define VESA_MODEINFO_SEG 0x0120
31 %define VESA_MODELIST_SEG 0x0140
32 %define GOOD_MODELIST_SEG 0x0160
33
34 [bits 16]
35
36 org BOOT_STAGE2_ADD
37
38
39 ;k now read root directory
40 00000000 BB0009 mov bx, BOOT_ROOT_SEG
41 00000003 8EDB mov ds, bx
42 00000005 31F6 xor si, si ;k now ds:si points to beginning of root directory
43 00000007 8EC6 mov es, si
44 00000009 B9E000 mov cx, 224 ;max root entries
45 loop_compare:
46 0000000C BF[FD07] mov di, kernel
47 0000000F 51 push cx
48 00000010 56 push si ;save pointer to root dir entry
49 00000011 B90B00 mov cx, 11
50 loop_name:
51 00000014 A6 cmpsb
52 00000015 E1FD loopz loop_name
53 00000017 7505 jnz goon ;cx didn't get to zero, bad file
54 00000019 5E pop si
55 0000001A 59 pop cx
56 0000001B E90600 jmp found_file ;good file, ds:si points to start of root directory entry
57 goon:
58 0000001E 5E pop si
59 0000001F 59 pop cx
60 00000020 E2EA loop loop_compare
61
62 error:
63 00000022 EBFE jmp $ ;halt! no kernel file found!
64
65 found_file: ;ds:si points to root dir entry of kernel file
66 00000024 31C0 xor ax, ax
67 00000026 8EE8 mov gs, ax
68 00000028 3E8B441A mov ax, [ds:si+26]
69 0000002C BBE007 mov bx, BOOT_FAT_SEG
70 0000002F 8EDB mov ds, bx ;ds points to beginning of FAT
71 00000031 66BF00001000 mov edi, BOOT_KERNEL_ADD
72
73 readkernel_loop:
74 00000037 3DF70F cmp ax, 0xff7
75 0000003A 7F52 jg readkernel_done
76 0000003C 50 push ax
77 0000003D E85C07 call getCHSfromCluster
78 00000040 B80102 mov ax, 0x0201
79 00000043 658A16247C mov dl, [gs:BOOT_DRIVE]
80 00000048 BBC00A mov bx, BOOT_KERNEL_SEG
81 0000004B 8EC3 mov es, bx
82 0000004D 31DB xor bx, bx
83 0000004F CD13 int 0x13
84 00000051 B90001 mov cx, 256
85 00000054 31C0 xor ax, ax
86 00000056 8EC0 mov es, ax
87 00000058 66BE00AC0000 mov esi, BOOT_KERNEL_SEG*16
88 copykernel_loop:
89 0000005E 26678B06 mov ax, [es:esi]
90 00000062 26678907 mov [es:edi], ax
91 00000066 6646 inc esi
92 00000068 6646 inc esi
93 0000006A 6647 inc edi
94 0000006C 6647 inc edi
95 0000006E E2EE loop copykernel_loop
96
97 00000070 58 pop ax ;current logical cluster #
98
99 00000071 89C1 mov cx, ax ;cx=logical cluster
100 00000073 BA0300 mov dx, 3
101 00000076 F7E2 mul dx
102 00000078 D1E8 shr ax, 1 ;ax=logical cluster * 3 / 2
103 0000007A 89C6 mov si, ax
104 0000007C F6C101 test cl, 1 ;is bit0 set?
105 0000007F 7507 jnz odd_cluster
106 even_cluster:
107 00000081 AD lodsw
108 00000082 25FF0F and ax, 0x0fff
109 00000085 E90400 jmp got_cluster
110 odd_cluster:
111 00000088 AD lodsw
112 00000089 C1E804 shr ax, 4
113 got_cluster:
114 0000008C EBA9 jmp readkernel_loop
115
116 ;------------------------------------------------------
117 readkernel_done: ;-------------put more real mode init stuff here!
118 ;----ask to load RD from floppy
119 0000008E B800B8 mov ax, 0xb800
120 00000091 8EC0 mov es, ax
121 00000093 31C0 xor ax, ax
122 00000095 8ED8 mov ds, ax
123 00000097 31FF xor di, di
124 00000099 B9D007 mov cx, 2000
125 0000009C B80007 mov ax, 0x0700
126 cls_loop:
127 0000009F AB stosw
128 000000A0 E2FD loop cls_loop
129
130 000000A2 BAD403 mov dx, 0x3d4 ;move cursor off screen...
131 000000A5 B00E mov al, 0x0e
132 000000A7 EE out dx, al
133 000000A8 42 inc dx
134 000000A9 B0FF mov al, 0xff
135 000000AB EE out dx, al
136 000000AC 4A dec dx
137 000000AD B00F mov al, 0x0f
138 000000AF EE out dx, al
139 000000B0 42 inc dx
140 000000B1 EE out dx, al
141
142 000000B2 31FF xor di, di
143 000000B4 BE[FB05] mov si, txt_welcome
144 000000B7 B41F mov ah, 0x1f
145 000000B9 E83E04 call puts
146
147 000000BC BFA000 mov di, 160
148 000000BF BE[4C06] mov si, txt_rd1
149 000000C2 B407 mov ah, 7
150 000000C4 E83304 call puts
151
152 000000C7 BE[6F06] mov si, txt_rd2
153 000000CA BF4001 mov di, 160*2
154 000000CD E82A04 call puts
155
156 000000D0 BFE001 mov di, 160*3
157 000000D3 BE[9406] mov si, txt_input
158 000000D6 E82104 call puts
159
160 get_rd:
161 000000D9 31C0 xor ax, ax
162 000000DB CD16 int 0x16
163 000000DD 3C31 cmp al, '1'
164 000000DF 7404 jz got_rd
165 000000E1 3C32 cmp al, '2'
166 000000E3 75F4 jnz get_rd
167 got_rd:
168 000000E5 AA stosb
169 000000E6 2C31 sub al, '1'
170 000000E8 1E push ds
171 000000E9 BB0090 mov bx, BOOT_DATA_SEG ;segment for data to send kernel
172 000000EC 8EDB mov ds, bx
173 000000EE 3EA20000 mov [ds:BOOT_HASRD], al
174 000000F2 1F pop ds ;ds=0
175 000000F3 3C00 cmp al, 0 ;dont load rd
176 000000F5 746F jz no_rd
177
178 000000F7 B95000 mov cx, 80
179 000000FA 66BF80820B00 mov edi, 0xb8000+160*4
180 filler_loop:
181 00000100 3E67C707B104 mov word [ds:edi], 0x0400+177
182 00000106 6647 inc edi
183 00000108 6647 inc edi
184 0000010A E2F4 loop filler_loop
185 0000010C B95000 mov cx, 80 ;80 cylinders to read
186 0000010F 31F6 xor si, si
187 00000111 66BF00002000 mov edi, BOOT_RD_ADD ;ram disk address
188 read_cylinder:
189 00000117 51 push cx
190 00000118 BB0001 mov bx, 0x0100
191 0000011B 8EC3 mov es, bx
192 0000011D 31DB xor bx, bx
193 0000011F B82402 mov ax, 0x0224
194 00000122 89F1 mov cx, si
195 00000124 88CD mov ch, cl
196 00000126 B101 mov cl, 1
197 00000128 31D2 xor dx, dx
198 0000012A 658A16247C mov dl, [gs:BOOT_DRIVE]
199 0000012F CD13 int 0x13
200
201 00000131 66BB00800B00 mov ebx, 0xb8000
202 00000137 01F3 add bx, si
203 00000139 D0E3 shl bl, 1
204 0000013B 3E67C78380020000DB- mov word [ds:ebx+160*4], 0x0200+219
205 00000144 02
206
207 00000145 56 push si
208 00000146 66BE00100000 mov esi, 0x1000
209 0000014C B90024 mov cx, 0x2400
210 copydisk_loop:
211 0000014F 3E678B06 mov ax, [ds:esi]
212 00000153 6646 inc esi
213 00000155 6646 inc esi
214 00000157 3E678907 mov [ds:edi], ax
215 0000015B 6647 inc edi
216 0000015D 6647 inc edi
217 0000015F E2EE loop copydisk_loop
218
219 00000161 5E pop si ;what cylinder# we are on...
220 00000162 46 inc si
221 00000163 59 pop cx
222 00000164 E2B1 loop read_cylinder
223
224 ;------------------------------------------------------
225 no_rd:
226 00000166 B80090 mov ax, BOOT_DATA_SEG
227 00000169 8EC0 mov es, ax
228 0000016B BF0020 mov di, BOOT_MEMMAP ;store memmap info in es:di for kernel
229 0000016E 6631D2 xor edx, edx
230 00000171 B80001 mov ax, 0x0100
231 00000174 8ED8 mov ds, ax
232 00000176 6631DB xor ebx, ebx
233 getmemmap_loop:
234 00000179 06 push es
235 0000017A 57 push di
236 0000017B 6652 push edx
237 0000017D B80001 mov ax, 0x0100 ;get memory map
238 00000180 8EC0 mov es, ax
239 00000182 31FF xor di, di
240 00000184 66B820E80000 mov eax, 0x0000E820
241 0000018A 66B914000000 mov ecx, 0x00000014
242 ;mov ebx, 0x00000000
243 00000190 66BA50414D53 mov edx, 0x534D4150 ;'SMAP'
244 00000196 CD15 int 0x15
245 00000198 7239 jc getmemmap_carry
246 0000019A 663D50414D53 cmp eax, 0x534D4150 ;eax should be 'SMAP' on return...
247 000001A0 751A jnz getmemmap_error
248 000001A2 6681FB00000000 cmp ebx, 0
249 000001A9 742A jz getmemmap_done
250
251 000001AB 665A pop edx ;now, copy memmap entry to es:di on the stack
252 000001AD 5F pop di
253 000001AE 07 pop es
254 000001AF 31F6 xor si, si
255 000001B1 B91400 mov cx, 20
256 getmemmap_copymem_loop:
257 000001B4 AC lodsb
258 000001B5 AA stosb
259 000001B6 E2FC loop getmemmap_copymem_loop
260 000001B8 6642 inc edx
261 000001BA EBBD jmp getmemmap_loop
262
263 getmemmap_error:
264 000001BC B800B8 mov ax, 0xb800
265 000001BF 8EC0 mov es, ax
266 000001C1 BF000F mov di, 160*24
267 000001C4 31C0 xor ax, ax
268 000001C6 8ED8 mov ds, ax
269 000001C8 BE[5D07] mov si, txt_memerror
270 000001CB B404 mov ah, 0x04
271 000001CD E82A03 call puts
272 000001D0 F4 hlt
273 000001D1 EBFE jmp $
274
275 getmemmap_carry:
276 000001D3 664A dec edx
277 getmemmap_done:
278 000001D5 665A pop edx
279 000001D7 5F pop di
280 000001D8 07 pop es
281
282 000001D9 31F6 xor si, si
283 000001DB B91400 mov cx, 20
284 getmemmap_done_copymem_loop:
285 000001DE AC lodsb
286 000001DF AA stosb
287 000001E0 E2FC loop getmemmap_done_copymem_loop
288 000001E2 6642 inc edx
289
290 000001E4 BF0A04 mov di, BOOT_MEMENTRIES
291 000001E7 26668915 mov [es:di], edx ;save # of memmap entries for kernel
292
293 ;on to vesa info...
294 000001EB 31C0 xor ax, ax
295 000001ED 8EE8 mov gs, ax
296 000001EF 8ED8 mov ds, ax
297 000001F1 B800B8 mov ax, 0xb800
298 000001F4 8EC0 mov es, ax
299 000001F6 BFA000 mov di, 160
300 000001F9 B98007 mov cx, 2000-80
301 000001FC B80007 mov ax, 0x0700
302 cls_vesa_loop:
303 000001FF AB stosw
304 00000200 E2FD loop cls_vesa_loop
305 00000202 BE[AB06] mov si, txt_vesa
306 00000205 BFA000 mov di, 160*1
307 00000208 B407 mov ah, 7
308 0000020A E8ED02 call puts
309
310 0000020D 57 push di
311 0000020E B80001 mov ax, 0x0100
312 00000211 8EC0 mov es, ax
313 00000213 31FF xor di, di
314 00000215 2666C70532454256 mov dword [es:di], "2EBV"
315 0000021D B8004F mov ax, 0x4F00
316
317 00000220 CD10 int 0x10
318 00000222 5F pop di
319 00000223 3D4F00 cmp ax, 0x004F
320 00000226 741C jz vesa_good
321 00000228 BE[E406] mov si, txt_novesa
322 0000022B B800B8 mov ax, 0xb800
323 0000022E 8EC0 mov es, ax
324 00000230 B407 mov ah, 7
325 00000232 E8C502 call puts
326 00000235 B80090 mov ax, BOOT_DATA_SEG
327 00000238 8ED8 mov ds, ax
328 0000023A 3EC70602000000 mov word [ds:BOOT_VESA], 0
329 00000241 E9B302 jmp vesa_done
330 vesa_good:
331 00000244 B800B8 mov ax, 0xb800
332 00000247 8EC0 mov es, ax
333 00000249 B80001 mov ax, 0x0100
334 0000024C 8ED8 mov ds, ax
335 0000024E 31F6 xor si, si
336 00000250 8B1E0400 mov bx, [4]
337 00000254 88F8 mov al, bh
338 00000256 E85203 call puthex
339 00000259 B02E mov al, '.'
340 0000025B AA stosb
341 0000025C B007 mov al, 7
342 0000025E AA stosb
343 0000025F 88D8 mov al, bl
344 00000261 E84703 call puthex
345 00000264 81C70400 add di, 4
346 00000268 80FF02 cmp bh, 2
347 0000026B 7D1B jge vesa_good2
348 0000026D 31C0 xor ax, ax
349 0000026F 8ED8 mov ds, ax
350 00000271 BE[1007] mov si, txt_vesaold
351 00000274 B407 mov ah, 7
352 00000276 E88102 call puts
353 00000279 B80090 mov ax, BOOT_DATA_SEG
354 0000027C 8ED8 mov ds, ax
355 0000027E 3EC70602000000 mov word [ds:BOOT_VESA], 0
356 00000285 E96F02 jmp vesa_done
357 vesa_good2:
358 00000288 668B1E0600 mov ebx, [6] ;something like 0x00000E60
359 0000028D 668B160E00 mov edx, [14]
360 00000292 89DE mov si, bx
361 00000294 66C1EB10 shr ebx, 16
362 00000298 8EDB mov ds, bx ;ds:si points to null-terminated OEM identification string
363 0000029A B402 mov ah, 2
364 0000029C 56 push si
365 0000029D E85A02 call puts
366 000002A0 5E pop si
367 000002A1 B80090 mov ax, BOOT_DATA_SEG
368 000002A4 8EC0 mov es, ax
369 000002A6 BF0400 mov di, BOOT_VESA_OEM
370 vesa_copyoem:
371 000002A9 AC lodsb
372 000002AA AA stosb
373 000002AB 08C0 or al, al
374 000002AD 75FA jnz vesa_copyoem
375 000002AF B80001 mov ax, 0x0100
376 000002B2 8ED8 mov ds, ax
377 000002B4 31F6 xor si, si
378 000002B6 BF0601 mov di, BOOT_VESA_VBE
379 000002B9 B90002 mov cx, 512
380 vesa_copyvbe:
381 000002BC AC lodsb
382 000002BD AA stosb
383 000002BE E2FC loop vesa_copyvbe
384
385 000002C0 89D6 mov si, dx
386 000002C2 66C1EA10 shr edx, 16
387 000002C6 8EDA mov ds, dx ;ds:si points to video mode list
388 000002C8 B84001 mov ax, VESA_MODELIST_SEG
389 000002CB 8EC0 mov es, ax
390 000002CD 31FF xor di, di
391 vesa_copymodes:
392 000002CF AD lodsw
393 000002D0 AB stosw
394 000002D1 3DFFFF cmp ax, 0xffff
395 000002D4 75F9 jnz vesa_copymodes
396
397 000002D6 B86001 mov ax, GOOD_MODELIST_SEG
398 000002D9 8EC0 mov es, ax
399 000002DB 31FF xor di, di
400 000002DD B90001 mov cx, 256
401 000002E0 B8FFFF mov ax, 0xffff
402 clear_good_mode_list_loop:
403 000002E3 AB stosw
404 000002E4 E2FD loop clear_good_mode_list_loop
405
406 000002E6 B84001 mov ax, VESA_MODELIST_SEG
407 000002E9 8ED8 mov ds, ax
408 000002EB 31F6 xor si, si ;ds:si points to video mode list where we can edit it :)
409 000002ED B86001 mov ax, GOOD_MODELIST_SEG
410 000002F0 8EC0 mov es, ax
411 000002F2 31FF xor di, di
412 000002F4 31D2 xor dx, dx ;dx=what good mode # we are on
413 vesa_readmodeinfo_loop:
414 000002F6 AD lodsw
415 000002F7 3DFFFF cmp ax, 0xffff
416 000002FA 7414 jz vesa_endofmodes
417 000002FC 50 push ax ;save mode#
418 000002FD E85401 call checkmode
419 00000300 3D0000 cmp ax, 0
420 00000303 7403 jz vesa_readmodeinfo_good
421 00000305 58 pop ax
422 00000306 EBEE jmp vesa_readmodeinfo_loop
423 vesa_readmodeinfo_good:
424 00000308 58 pop ax ;restore mode#
425 00000309 AB stosw
426 0000030A E8BA00 call vesa_showmodeinfo
427 0000030D 42 inc dx
428 0000030E EBE6 jmp vesa_readmodeinfo_loop
429
430 vesa_endofmodes: ;here we have a list of good modes at GOOD_MODELIST_SEG:0
431 00000310 31C0 xor ax, ax
432 00000312 8ED8 mov ds, ax
433 00000314 BE[4707] mov si, txt_consolemode
434 00000317 B800B8 mov ax, 0xb800
435 0000031A 8EC0 mov es, ax
436 0000031C BF4001 mov di, 160*2
437 0000031F B407 mov ah, 7
438 00000321 E8D601 call puts
439 00000324 BFE001 mov di, 160*3
440 00000327 89D1 mov cx, dx
441 00000329 B062 mov al, 'b'
442 vesa_displaylabels:
443 0000032B AA stosb
444 0000032C 50 push ax
445 0000032D B007 mov al, 7
446 0000032F AA stosb
447 00000330 B02E mov al, '.'
448 00000332 AA stosb
449 00000333 B007 mov al, 7
450 00000335 AA stosb
451 00000336 58 pop ax
452 00000337 FEC0 inc al
453 00000339 81C79C00 add di, 160-4
454 0000033D E2EC loop vesa_displaylabels ;done drawing screen of VESA choices, now ask for one
455 ;valid options are 'a' through (al-1)
456 0000033F 88C3 mov bl, al
457 00000341 31C0 xor ax, ax
458 00000343 8ED8 mov ds, ax
459 00000345 BF000F mov di, 160*24
460 00000348 BE[9406] mov si, txt_input
461 0000034B B40E mov ah, 14
462 0000034D E8AA01 call puts
463 vesa_getchoice:
464 00000350 31C0 xor ax, ax
465 00000352 CD16 int 0x16
466 00000354 3C61 cmp al, 'a'
467 00000356 7CF8 jl vesa_getchoice
468 00000358 38D8 cmp al, bl
469 0000035A 7DF4 jge vesa_getchoice
470 0000035C AA stosb
471 0000035D 50 push ax
472 0000035E B00E mov al, 14
473 00000360 AA stosb
474 00000361 58 pop ax
475 00000362 30E4 xor ah, ah
476 00000364 2D6100 sub ax, 'a'
477 00000367 3D0000 cmp ax, 0
478 0000036A 744C jz vesa_consolemode_only
479 0000036C 89C1 mov cx, ax ;cx holds good mode# (1=first good vesa mode)
480 0000036E 49 dec cx
481 0000036F B86001 mov ax, GOOD_MODELIST_SEG
482 00000372 8ED8 mov ds, ax
483 00000374 D1E1 shl cx, 1
484 00000376 89CE mov si, cx ;ds:si points to word containing selected mode#
485 00000378 AD lodsw
486 00000379 89C1 mov cx, ax
487 0000037B 89C2 mov dx, ax ;cx and dx hold mode#
488
489 0000037D B82001 mov ax, VESA_MODEINFO_SEG
490 00000380 8EC0 mov es, ax
491 00000382 31FF xor di, di
492 00000384 B8014F mov ax, 0x4F01
493 00000387 CD10 int 0x10
494 00000389 E87A01 call checkvesa
495
496 0000038C B82001 mov ax, VESA_MODEINFO_SEG
497 0000038F 8ED8 mov ds, ax
498 00000391 31F6 xor si, si
499 00000393 B80090 mov ax, BOOT_DATA_SEG
500 00000396 8EC0 mov es, ax
501 00000398 BF0603 mov di, BOOT_VESA_INFO
502 0000039B B90001 mov cx, 256
503 vesa_copymodeinfo_loop:
504 0000039E AC lodsb
505 0000039F AA stosb
506 000003A0 E2FC loop vesa_copymodeinfo_loop ;store ModeInfoBlock for current
507
508 000003A2 2689160200 mov [es:BOOT_VESA], dx ;store mode# for kernel
509
510 ; mov ax, 0xb800
511 ; mov es, ax
512 ; xor di, di
513 ; mov al, dh
514 ; call puthex2
515 ; mov al, dl
516 ; call puthex2
517
518 000003A7 89D3 mov bx, dx
519 000003A9 81CB0040 or bx, 0x4000 ;set "use LFB" bit of mode#
520 000003AD B8024F mov ax, 0x4F02
521 000003B0 CD10 int 0x10 ;switch to graphics mode!!!
522 000003B2 E85101 call checkvesa
523
524 000003B5 E93F01 jmp vesa_done
525
526 vesa_consolemode_only:
527 000003B8 B80090 mov ax, BOOT_DATA_SEG
528 000003BB 8EC0 mov es, ax
529 000003BD 26C70602000000 mov word [es:BOOT_VESA], 0
530
531 000003C4 E93001 jmp vesa_done
532
533 ;------------------------------------------------------
534 vesa_showmodeinfo:
535 000003C7 60 pusha
536 000003C8 06 push es
537 000003C9 1E push ds
538 000003CA B82001 mov ax, VESA_MODEINFO_SEG
539 000003CD 8ED8 mov ds, ax
540 000003CF 31F6 xor si, si
541 000003D1 B800B8 mov ax, 0xb800
542 000003D4 8EC0 mov es, ax
543
544 000003D6 89D1 mov cx, dx
545
546 000003D8 B8A000 mov ax, 160
547 000003DB F7E2 mul dx ;ax=160*mod#
548 000003DD 05E601 add ax, 160*3+6 ;offset first line of modes and room on left for label
549 000003E0 89C7 mov di, ax
550
551 000003E2 3EA11200 mov ax, [ds:18]
552 000003E6 E83901 call console_putDec
553 000003E9 81C70A00 add di, 10
554 000003ED B078 mov al, 'x'
555 000003EF E8B401 call console_putChar
556 000003F2 47 inc di
557 000003F3 47 inc di
558 000003F4 3EA11400 mov ax, [ds:20]
559 000003F8 E82701 call console_putDec
560 000003FB 81C70A00 add di, 10
561 000003FF B078 mov al, 'x'
562 00000401 E8A201 call console_putChar
563 00000404 47 inc di
564 00000405 47 inc di
565 00000406 30E4 xor ah, ah
566 00000408 3EA01900 mov al, [ds:25]
567 0000040C E81301 call console_putDec
568 0000040F 81C70800 add di, 8
569 00000413 3EA00000 mov al, [ds:0]
570 00000417 A880 test al, 0x80
571 00000419 7435 jz vesa_showmodeinfo_done
572 0000041B B04C mov al, 'L'
573 0000041D E88601 call console_putChar
574 00000420 B046 mov al, 'F'
575 00000422 E88101 call console_putChar
576 00000425 B042 mov al, 'B'
577 00000427 E87C01 call console_putChar
578 0000042A 47 inc di
579 0000042B 47 inc di
580 0000042C 3E668B1E2800 mov ebx, [ds:40]
581 00000432 6689D8 mov eax, ebx
582 00000435 66C1E818 shr eax, 24
583 00000439 E89901 call puthex2
584 0000043C 6689D8 mov eax, ebx
585 0000043F 66C1E810 shr eax, 16
586 00000443 E88F01 call puthex2
587 00000446 88F8 mov al, bh
588 00000448 E88A01 call puthex2
589 0000044B 88D8 mov al, bl
590 0000044D E88501 call puthex2
591 vesa_showmodeinfo_done:
592 00000450 1F pop ds
593 00000451 07 pop es
594 00000452 61 popa
595 00000453 C3 ret
596
597 ;------------------------------------------------------
598 checkmode:
599 00000454 53 push bx
600 00000455 51 push cx
601 00000456 52 push dx
602 00000457 06 push es
603 00000458 1E push ds
604 00000459 57 push di
605 0000045A 56 push si
606 0000045B 89C1 mov cx, ax ;cx=modenumber
607 0000045D B82001 mov ax, VESA_MODEINFO_SEG
608 00000460 8EC0 mov es, ax
609 00000462 31FF xor di, di
610 00000464 B8014F mov ax, 0x4F01
611 00000467 CD10 int 0x10
612 00000469 E89A00 call checkvesa
613 0000046C 31FF xor di, di ;es:di -> ModeInfoBlock struc
614 0000046E 268B05 mov ax, [es:di] ;ModeAttributes
615 00000471 A801 test al, 1 ;mode supported
616 00000473 7477 jz vesa_modenogood
617 00000475 A808 test al, 8 ;color mode
618 00000477 7473 jz vesa_modenogood
619 00000479 A810 test al, 0x10 ;graphics mode
620 0000047B 746F jz vesa_modenogood
621 0000047D A880 test al, 0x80 ;Linear Frame Buffer supported
622 0000047F 746B jz vesa_modenogood
623 00000481 268A4519 mov al, [es:di+25] ;BitsPerPixel
624 00000485 3C10 cmp al, 16
625 00000487 7408 jz vesa_bppok
626 00000489 3C18 cmp al, 24
627 0000048B 7404 jz vesa_bppok
628 0000048D 3C20 cmp al, 32
629 0000048F 755B jnz vesa_modenogood
630 vesa_bppok:
631 00000491 268B4512 mov ax, [es:di+18] ;XResolution
632 00000495 268B5D14 mov bx, [es:di+20] ;YResolution
633 00000499 3D8002 cmp ax, 640 ;640x480
634 0000049C 7509 jnz res_goon1
635 0000049E 81FBE001 cmp bx, 480
636 000004A2 7548 jnz vesa_modenogood
637 000004A4 E93B00 jmp vesa_modegood
638 res_goon1:
639 000004A7 3D2003 cmp ax, 800
640 000004AA 7509 jnz res_goon2
641 000004AC 81FB5802 cmp bx, 600
642 000004B0 753A jnz vesa_modenogood
643 000004B2 E92D00 jmp vesa_modegood
644 res_goon2:
645 000004B5 3D0004 cmp ax, 1024
646 000004B8 7509 jnz res_goon3
647 000004BA 81FB0003 cmp bx, 768
648 000004BE 752C jnz vesa_modenogood
649 000004C0 E91F00 jmp vesa_modegood
650 res_goon3:
651 000004C3 3D0005 cmp ax, 1280
652 000004C6 750F jnz res_goon4
653 000004C8 81FB0004 cmp bx, 1024
654 000004CC 7414 jz vesa_modegood
655 000004CE 81FBC003 cmp bx, 960
656 000004D2 740E jz vesa_modegood
657 000004D4 E91500 jmp vesa_modenogood
658 res_goon4:
659 000004D7 3D4006 cmp ax, 1600
660 000004DA 7510 jnz vesa_modenogood
661 000004DC 81FBB004 cmp bx, 1200
662 000004E0 750A jnz vesa_modenogood
663 vesa_modegood:
664 000004E2 5E pop si
665 000004E3 5F pop di
666 000004E4 1F pop ds
667 000004E5 07 pop es
668 000004E6 5A pop dx
669 000004E7 59 pop cx
670 000004E8 5B pop bx
671 000004E9 31C0 xor ax, ax
672 000004EB C3 ret
673 vesa_modenogood:
674 000004EC 5E pop si
675 000004ED 5F pop di
676 000004EE 1F pop ds
677 000004EF 07 pop es
678 000004F0 5A pop dx
679 000004F1 59 pop cx
680 000004F2 5B pop bx
681 000004F3 B8FFFF mov ax, 0xffff
682 000004F6 C3 ret
683
684 ;------------------------------------------------------
685 vesa_done:
686
687 ; xor ax, ax ;wait for keypress...
688 ; int 0x16
689
690 000004F7 E9D902 jmp go_pm
691
692 ;------------------------------------------------------
693 puts:
694 000004FA AC lodsb
695 000004FB 08C0 or al, al
696 000004FD 7406 jz puts_done
697 000004FF AA stosb
698 00000500 88E0 mov al, ah
699 00000502 AA stosb
700 00000503 EBF5 jmp puts
701 puts_done:
702 00000505 C3 ret
703
704 ;------------------------------------------------------
705 checkvesa:
706 00000506 3D4F00 cmp ax, 0x004F
707 00000509 7501 jnz vesaerror
708 0000050B C3 ret
709 vesaerror:
710 0000050C B800B8 mov ax, 0xb800
711 0000050F 8EC0 mov es, ax
712 00000511 31C0 xor ax, ax
713 00000513 8ED8 mov ds, ax
714 00000515 BE[BA06] mov si, txt_vesaerror
715 00000518 BF000F mov di, 160*24
716 0000051B B404 mov ah, 4
717 0000051D E8DAFF call puts
718 00000520 FA cli
719 00000521 F4 hlt
720
721 ;-------Function console_putDec
722 ;input:
723 ; AX = number to display
724 ;output:
725 ; number written in decimal to es:di
726 console_putDec:
727 00000522 60 pusha
728 00000523 31D2 xor dx, dx
729 00000525 30FF xor bh, bh ;no characters written yet
730 00000527 B91027 mov cx, 10000
731 0000052A F7F1 div cx ;ax=quotiont, dx=remainder
732 0000052C 053000 add ax, '0'
733 0000052F 3D3000 cmp ax, '0'
734 00000532 7405 je .goon1
735 00000534 E86F00 call console_putChar
736 00000537 B701 mov bh, 1
737
738 .goon1:
739 00000539 89D0 mov ax, dx ;load remainder to ax
740 0000053B 31D2 xor dx, dx
741 0000053D B9E803 mov cx, 1000
742 00000540 F7F1 div cx ;ax=quotiont, dx=remainder
743 00000542 053000 add ax, '0'
744 00000545 3D3000 cmp ax, '0'
745 00000548 7408 je .goon11
746 0000054A E85900 call console_putChar
747 0000054D B701 mov bh, 1
748 0000054F E90800 jmp .goon2
749 .goon11:
750 00000552 80FF00 cmp bh, 0
751 00000555 7403 je .goon2
752 00000557 E84C00 call console_putChar
753
754 .goon2:
755 0000055A 89D0 mov ax, dx ;load remainder to ax
756 0000055C 31D2 xor dx, dx
757 0000055E B96400 mov cx, 100
758 00000561 F7F1 div cx ;ax=quotiont, dx=remainder
759 00000563 053000 add ax, '0'
760 00000566 3D3000 cmp ax, '0'
761 00000569 7408 je .goon21
762 0000056B E83800 call console_putChar
763 0000056E B701 mov bh, 1
764 00000570 E90800 jmp .goon3
765 .goon21:
766 00000573 80FF00 cmp bh, 0
767 00000576 7403 je .goon3
768 00000578 E82B00 call console_putChar
769
770 .goon3:
771 0000057B 89D0 mov ax, dx ;load remainder to ax
772 0000057D 31D2 xor dx, dx
773 0000057F B90A00 mov cx, 10
774 00000582 F7F1 div cx ;ax=quotiont, dx=remainder
775 00000584 053000 add ax, '0'
776 00000587 3D3000 cmp ax, '0'
777 0000058A 7408 je .goon31
778 0000058C E81700 call console_putChar
779 0000058F B701 mov bh, 1
780 00000591 E90800 jmp .goon4
781 .goon31:
782 00000594 80FF00 cmp bh, 0
783 00000597 7403 je .goon4
784 00000599 E80A00 call console_putChar
785 .goon4: ;here dx contains last remainder
786 0000059C 89D0 mov ax, dx
787 0000059E 053000 add ax, '0'
788 000005A1 E80200 call console_putChar
789
790 000005A4 61 popa
791 000005A5 C3 ret
792
793 ;------------------------------------------------------
794 console_putChar:
795 000005A6 AA stosb
796 000005A7 B007 mov al, 7
797 000005A9 AA stosb
798 000005AA C3 ret
799
800 ;------------------------------------------------------
801 puthex:
802 ;es:di points to video memory
803 ;al holds hex value
804
805 000005AB 50 push ax
806 000005AC 88C4 mov ah, al
807 000005AE C1E804 shr ax, 4
808 000005B1 240F and al, 0x0F
809 000005B3 0430 add al, '0'
810 000005B5 3C39 cmp al, '9'
811 000005B7 7E02 jle puthex_goon1
812 000005B9 0407 add al, 'A'-'9'-1
813 puthex_goon1:
814 000005BB 3C30 cmp al, '0'
815 000005BD 7404 jz puthex_skipzero
816 000005BF AA stosb
817 000005C0 B007 mov al, 7
818 000005C2 AA stosb
819 puthex_skipzero:
820 000005C3 58 pop ax
821 000005C4 50 push ax
822 000005C5 240F and al, 0x0F
823 000005C7 0430 add al, '0'
824 000005C9 3C39 cmp al, '9'
825 000005CB 7E02 jle puthex_goon2
826 000005CD 0407 add al, 'A'-'9'-1
827 puthex_goon2:
828 000005CF AA stosb
829 000005D0 B007 mov al, 7
830 000005D2 AA stosb
831 000005D3 58 pop ax
832 000005D4 C3 ret
833
834 ;------------------------------------------------------
835 puthex2:
836 ;es:di points to video memory, always displays 2 characters!
837 ;al holds hex value
838
839 000005D5 50 push ax
840 000005D6 88C4 mov ah, al
841 000005D8 C1E804 shr ax, 4
842 000005DB 240F and al, 0x0F
843 000005DD 0430 add al, '0'
844 000005DF 3C39 cmp al, '9'
845 000005E1 7E02 jle puthex2_goon1
846 000005E3 0407 add al, 'A'-'9'-1
847 puthex2_goon1:
848 000005E5 AA stosb
849 000005E6 B007 mov al, 7
850 000005E8 AA stosb
851 000005E9 58 pop ax
852 000005EA 50 push ax
853 000005EB 240F and al, 0x0F
854 000005ED 0430 add al, '0'
855 000005EF 3C39 cmp al, '9'
856 000005F1 7E02 jle puthex2_goon2
857 000005F3 0407 add al, 'A'-'9'-1
858 puthex2_goon2:
859 000005F5 AA stosb
860 000005F6 B007 mov al, 7
861 000005F8 AA stosb
862 000005F9 58 pop ax
863 000005FA C3 ret
864
865 ;------------------------------------------------------
866 000005FB 202020202020202020- txt_welcome: db " Welcome to HOS v", VERSION, "! ", 0
867 00000604 202020202020202020-
868 0000060D 202020202020202020-
869 00000616 202057656C636F6D65-
870 0000061F 20746F20484F532076-
871 00000628 302E312E3221202020-
872 00000631 202020202020202020-
873 0000063A 202020202020202020-
874 00000643 202020202020202000
875 0000064C 312E20446F206E6F74- txt_rd1: db "1. Do not load an initial ram disk", 0
876 00000655 206C6F616420616E20-
877 0000065E 696E697469616C2072-
878 00000667 616D206469736B00
879 0000066F 322E204C6F61642069- txt_rd2: db "2. Load initial ram disk from floppy", 0
880 00000678 6E697469616C207261-
881 00000681 6D206469736B206672-
882 0000068A 6F6D20666C6F707079-
883 00000693 00
884 00000694 456E74657220796F75- txt_input: db "Enter your selection: ", 0
885 0000069D 722073656C65637469-
886 000006A6 6F6E3A2000
887 000006AB 564553412076657273- txt_vesa: db "VESA version: ", 0
888 000006B4 696F6E3A2000
889 000006BA 564553412066756E63- txt_vesaerror: db "VESA function call error! Halting system!", 0
890 000006C3 74696F6E2063616C6C-
891 000006CC 206572726F72212048-
892 000006D5 616C74696E67207379-
893 000006DE 7374656D2100
894 000006E4 56455341206E6F7420- txt_novesa: db "VESA not found. Starting in console mode...", 0
895 000006ED 666F756E642E205374-
896 000006F6 617274696E6720696E-
897 000006FF 20636F6E736F6C6520-
898 00000708 6D6F64652E2E2E00
899 00000710 564553412076657273- txt_vesaold: db "VESA version 2.0 required. Starting in console mode...", 0
900 00000719 696F6E20322E302072-
901 00000722 657175697265642E20-
902 0000072B 5374617274696E6720-
903 00000734 696E20636F6E736F6C-
904 0000073D 65206D6F64652E2E2E-
905 00000746 00
906 00000747 612E20436F6E736F6C- txt_consolemode: db "a. Console mode only.", 0
907 00000750 65206D6F6465206F6E-
908 00000759 6C792E00
909 0000075D 457874656E64656420- txt_memerror: db "Extended Memory Map information unavailable! Halting system...", 0
910 00000766 4D656D6F7279204D61-
911 0000076F 7020696E666F726D61-
912 00000778 74696F6E20756E6176-
913 00000781 61696C61626C652120-
914 0000078A 48616C74696E672073-
915 00000793 797374656D2E2E2E00
916
917 ;------------------------------------------------------
918 getCHSfromCluster:
919 ;input: ax=lba of sector on floppy (0-2879)
920 0000079C 051F00 add ax, 31 ;convert logical cluster# to lba#
921 0000079F 31D2 xor dx, dx ;lba->chs
922 000007A1 BB1200 mov bx, 18
923 000007A4 F7F3 div bx
924 000007A6 42 inc dx
925 000007A7 88D1 mov cl, dl ;sector# (1-18)
926 000007A9 31D2 xor dx, dx
927 000007AB BB0200 mov bx, 2
928 000007AE F7F3 div bx
929 000007B0 88C5 mov ch, al ;cylinder# (0-79)
930 000007B2 88D6 mov dh, dl ;head# (0-1)
931 000007B4 C3 ret
932
933
934 ;-------------------------------------------------------
935 gdtr:
936 000007B5 1700 dw gdt_end-gdt-1
937 000007B7 [BB070000] dd gdt
938 gdt:
939 000007BB 00000000 dd 0
940 000007BF 00000000 dd 0
941
942 KERNEL_CODE equ $-gdt
943 000007C3 FF db 0xff ;limit 7:0
944 000007C4 FF db 0xff ;limit 15:8
945 000007C5 00 db 0x00 ;base 7:0
946 000007C6 00 db 0x00 ;base 15:8
947 000007C7 00 db 0x00 ;base 23:16
948 000007C8 9A db 0x9a ;access
949 000007C9 CF db 0xcf ;flags / limit 19:16
950 000007CA 00 db 0x00 ;base 31:24
951
952 KERNEL_DATA equ $-gdt
953 000007CB FF db 0xff ;segment 16 = 4gb data
954 000007CC FF db 0xff
955 000007CD 00 db 0x00
956 000007CE 00 db 0x00
957 000007CF 00 db 0x00
958 000007D0 92 db 0x92
959 000007D1 CF db 0xcf ;cf
960 000007D2 00 db 0x00
961
962 gdt_end:
963
964 ;------------------------------------------------------
965 go_pm:
966 000007D3 31C0 xor ax, ax
967 000007D5 8ED8 mov ds, ax
968 000007D7 0F0116[B507] lgdt [gdtr]
969 000007DC FA cli
970 000007DD 0F20C0 mov eax, cr0
971 000007E0 6640 inc eax
972 000007E2 0F22C0 mov cr0, eax
973
974 000007E5 EA[EA07]0800 jmp KERNEL_CODE:pmode
975
976 bits 32
977 pmode:
978 000007EA 66B81000 mov ax, KERNEL_DATA
979 000007EE 8EC0 mov es, ax
980 000007F0 8ED8 mov ds, ax
981 000007F2 8EE0 mov fs, ax
982 000007F4 8EE8 mov gs, ax
983 000007F6 EA000010000800 jmp KERNEL_CODE:BOOT_KERNEL_ADD
984
985 000007FD 4B45524E454C202042- kernel: db "KERNEL BIN", 0
986 00000806 494E00
987
988

BIN
stage1.bin
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1
stage2.asm
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@ -30,6 +30,7 @@ loop_name:
jmp found_file ;good file, ds:si points to start of root directory entry
goon:
pop si
add si, 32
pop cx
loop loop_compare

BIN
stage2.bin
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7
tetris.c
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@ -1,7 +0,0 @@
// tetris.x
// Author: Josh Holtrop
// Date: 09/30/03

127
vmm.c
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@ -14,62 +14,103 @@ void vmm_init()
printf("ERROR! COULD NOT ALLOCATE PAGE FOR INITIAL PAGE DIRECTORY!!\n");
halt();
}
dword address = 0;
PageTable *tmp;
int pde;
int pte;
for (pde = 0; pde<1024; pde++)
vmm_init_pagetable((dword)vmm_PDBR);
if (mm_totalmem % 4096)
vmm_first_virtual_address = mm_totalmem + (4096 - (mm_totalmem % 4096));
else
vmm_first_virtual_address = mm_totalmem;
if (vmm_mapn(0, 0, 0x03, mm_totalmem/4096+1))
{
for (pte = 0; pte<1024; pte++)
{
if (pte == 0)
{
if (!(tmp = mm_palloc(1, PID_KERNEL)))
{
printf("ERROR! Page could not be allocated for PDE %d, PTE %d!\n", pde, pte);
printf("Could not page in all physical RAM!\n");
halt();
}
vmm_PDBR->pageTables[pde] = ((dword)tmp | 0x00000003); //present, read/write, supervisor priviledge
//we also need to map in the video framebuffer memory:
if (video_mode.PhysBasePtr > 0 && video_mode.BitsPerPixel > 0)
{
if (vmm_mapn(video_mode.PhysBasePtr, video_mode.PhysBasePtr, 0x03, (video_mode.BitsPerPixel/8 * video_mode.XResolution * video_mode.YResolution)/4096+1))
{
printf("Could not page in video memory at 0x%x!\n", video_mode.PhysBasePtr);
halt();
}
tmp = (PageTable *)((vmm_PDBR->pageTables[pde]) & 0xFFFFF000); //mask out address of page table
tmp->page[pte] = (address | 0x00000003); //present, read/write, supervisor priviledge
address += 4096;
if (address >= mm_totalmem)
pte = pde = 2000;
}
}
//we also need to map in the video framebuffer memory:
dword framebuffer_end = video_mode.PhysBasePtr + video_mode.BitsPerPixel/8 * video_mode.XResolution * video_mode.YResolution; //framebuffer size in bytes
address = video_mode.PhysBasePtr;
if (address != 0) //we do have a graphics buffer
void vmm_enable_paging()
{
pde = (address & 0xFFC00000) >> 22;
pte = (address & 0x003FF000) >> 12;
if (pte != 0)
vmm_PDBR->pageTables[pde] = (dword)mm_palloc(1, PID_KERNEL) | 0x03; //present, read/write, supervisor priviledge
for ( ; pde<1024; pde++) //top 10 bits are page directory index
{
for ( ; pte<1024; pte++) //next 10 bits page table index
{
if (pte == 0)
{
if (!(tmp = mm_palloc(1, PID_KERNEL)))
{
printf("ERROR! Page could not be allocated for PDE %d, PTE %d!\n", pde, pte);
halt();
write_cr3((dword)vmm_PDBR);
write_cr0(0x80000000|read_cr0());
}
vmm_PDBR->pageTables[pde] = ((dword)tmp | 0x00000003); //present, read/write, supervisor priviledge
int vmm_map1(dword virtual, dword physical, dword flags)
{
if (virtual & 0x00000FFF)
return 1; // ERROR 1: address not page-aligned
if (physical & 0x00000FFF)
return 1; // ERROR 1: address not page-aligned
int pde = (virtual & 0xFFC00000) >> 22;
int pte = (virtual & 0x003FF000) >> 12;
if (!(vmm_PDBR->pageTables[pde] & 0x01))
{
vmm_PDBR->pageTables[pde] = (dword)mm_palloc(1, PID_KERNEL) | 0x7; //user, r/w, present
vmm_init_pagetable(vmm_PDBR->pageTables[pde] & 0xFFFFF000);
if (vmm_PDBR->pageTables[pde] == 0x07)
return 2; // ERROR 2: page table could not be created
}
tmp = (PageTable *)((vmm_PDBR->pageTables[pde]) & 0xFFFFF000); //mask out address of page table
tmp->page[pte] = (address | 0x00000003); //present, read/write, supervisor priviledge
address += 4096;
if (address >= framebuffer_end)
pte = pde = 2000;
PageTable *ptp = (PageTable *)(vmm_PDBR->pageTables[pde] & 0xFFFFF000);
if (ptp->page[pte] & 0x01)
return 3; // ERROR 3: page table entry already exists
ptp->page[pte] = physical | flags;
return 0;
}
pte = 0;
int vmm_mapn(dword virtual, dword physical, dword flags, dword n)
{
int mapped;
int result = 0;
dword va = virtual;
dword pa = physical;
for (mapped = 0; mapped < n; mapped++)
{
result = vmm_map1(va, pa, flags);
if (result != 0)
{
if (mapped > 0)
vmm_unmapn(virtual, mapped);
return result;
}
va += 4096;
pa += 4096;
}
}
int vmm_unmap1(dword virtual)
{
int pde = (virtual & 0xFFC00000) >> 22;
int pte = (virtual & 0x003FF000) >> 12;
if (virtual & 0x00000FFF)
return 1; // ERROR 1: address not page-aligned
PageTable *ptp = (PageTable *)(vmm_PDBR->pageTables[pde] & 0xFFFFF000);
}
int vmm_unmapn(dword virtual, dword n)
{
}
void vmm_init_pagetable(dword address)
{
PageTable *ptp = (PageTable *)address;
int n;
for (n = 0; n < 1024; n++)
ptp->page[n] = 0;
}

9
vmm.h
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@ -3,6 +3,7 @@
// Author: Josh Holtrop
// Date: 09/30/03
typedef struct {
dword page[1024];
} PageTable;
@ -11,10 +12,16 @@ typedef struct {
dword pageTables[1024];
} PageDirectory;
void vmm_enable_paging();
void vmm_init();
void *malloc(dword bytes);
int free(void *ptr);
int vmm_map1(dword virtual, dword physical, dword flags);
int vmm_mapn(dword virtual, dword physical, dword flags, dword n);
int vmm_unmap1(dword virtual);
int vmm_unmapn(dword virtual, dword n);
void vmm_init_pagetable(dword address);