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hos/lst/kernel.lst

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1 ;kernel.asm
2 ;Author: Josh Holtrop
3 ;Modified: 10/30/03
4
5 %define GDT_P 0x100000; ;1mb physical - Global Descriptor Table space
6 %define GDT_V GDT_P+0xC0000000
7 %define IDT_P 0x102000 ;1mb+8kb - Interrupt Descriptor Table space
8 %define IDT_V IDT_P+0xC0000000
9 %define PDBR_P 0x104000 ;1mb+16kb - Page Directory Base Register (first PD)
10 %define PDBR_V PDBR_P+0xC0000000
11 %define LOPT_P 0x105000 ;1mb+20kb - LOw Page Table for mapping first 4mb
12 %define LOPT_V LOPT_P+0xC0000000
13 %define KERNEL_P 0x106000 ;1mb+24kb - the kernel's physical address
14 %define KERNEL_V KERNEL_P+0xC0000000 ;3gb+1mb+24kb, the virtual address of the kernel
15
16 [global start]
17 [extern _isr]
18 [extern _k_init]
19
20 bits 32
21
22 ;This is where the kernel begins execution
23 ;At this point, the temporary gdt is set up to "map" 0xC000_0000 to 0x0.
24 ;We must enable paging with the first 4mb mapped 1:1 virtual:physical
25 ; and with the 4mb starting at 0xC000_0000 mapped to the first 4mb physical.
26 ;Then we can start using our "real" gdt, then unmap the lower 4mb.
27 start:
28 00000000 FA cli ;if they weren't already off
29
30 00000001 31C0 xor eax, eax
31 00000003 BF004010C0 mov edi, PDBR_V
32 00000008 B900040000 mov ecx, 1024 ;clear the PDBR
33 0000000D F3AB rep stosd
34 0000000F C705004010C0035010- mov [PDBR_V], dword LOPT_P|0x03 ;store the physical address of the LOw Page Table (read/write, present)
35 00000018 00
36 00000019 C705004C10C0035010- mov [PDBR_V+0xC00], dword LOPT_P|0x03 ;store the physical address of the LOw Page Table (read/write, present)
37 00000022 00
38
39 00000023 BF005010C0 mov edi, LOPT_V
40 00000028 B900040000 mov ecx, 1024
41 0000002D B803000000 mov eax, 0x03 ;starting physical address = 0x0 (read/write, present flags)
42 fill_lopt_loop: ;fill the page table
43 00000032 AB stosd
44 00000033 0500100000 add eax, 4096 ;increment next phsyical address by 4kb
45 00000038 E2F8 loop fill_lopt_loop
46
47 0000003A B800401000 mov eax, PDBR_P
48 0000003F 0F22D8 mov cr3, eax ;store the Page Directory Base Address
49 00000042 0F20C0 mov eax, cr0
50 00000045 0D00000080 or eax, 0x80000000 ;set page enable bit
51 0000004A 0F22C0 mov cr0, eax ;now paging is active!
52
53
54 0000004D BF000010C0 mov edi, GDT_V
55 00000052 BE[D4000000] mov esi, gdt
56 00000057 B948000000 mov ecx, gdt_end-gdt
57 copy_gdt:
58 0000005C AC lodsb
59 0000005D AA stosb
60 0000005E E2FC loop copy_gdt
61
62 00000060 BF002010C0 mov edi, IDT_V ;destination
63 00000065 BE[22010000] mov esi, isr_0 ;address of isr0
64 0000006A BA0B000000 mov edx, isr_1-isr_0 ;distance between isr labels
65 0000006F B932000000 mov ecx, 50 ;number of isrlabels
66 fill_idt:
67 00000074 89F3 mov ebx, esi
68 00000076 6689F0 mov ax, si
69 00000079 66AB stosw ;0 offset 15:0
70 0000007B 66B80800 mov ax, KERNEL_CODE
71 0000007F 66AB stosw ;2 selector 15:0
72 00000081 66B8008E mov ax, 0x8E00
73 00000085 66AB stosw ;4 [P][DPL][0][TYPE][0][0][0][0][0][0][0][0]
74 00000087 C1EE10 shr esi, 16
75 0000008A 6689F0 mov ax, si
76 0000008D 66AB stosw ;6 offset 31:16
77 0000008F 89DE mov esi, ebx
78 00000091 01D6 add esi, edx
79 00000093 E2DF loop fill_idt
80 00000095 66C705842110C000EE mov word [IDT_V+0x30*8+4], 0xEE00 ;interrupt 0x30 has user priviledges
81
82 0000009E 0F0115[CE000000] lgdt [gdtr] ;load gdt
83 000000A5 EA[AC000000]0800 jmp KERNEL_CODE:newgdtcontinue
84 newgdtcontinue:
85 000000AC 66B81000 mov ax, KERNEL_DATA
86 000000B0 8EC0 mov es, ax
87 000000B2 8ED8 mov ds, ax
88 000000B4 8EE8 mov gs, ax
89 000000B6 8EE0 mov fs, ax
90 000000B8 8ED0 mov ss, ax
91 000000BA BCFCFF1FC0 mov esp, 0xc01ffffc ;stack just under 3gb+2mb, moves downward
92 000000BF 0F011D[1C010000] lidt [idtr] ;load idt
93
94 000000C6 E8(00000000) call _k_init
95 haltit:
96 000000CB F4 hlt ;halt processor when k_init is done
97 000000CC EBFD jmp haltit ;shouldn't get here...
98
99 %include "gdt.inc"
100 <1> ;gdt.inc
101 <1> ;Author: Josh Holtrop
102 <1> ;for HOS
103 <1> ;Modified: 10/30/03
104 <1>
105 <1> gdtr:
106 000000CE 4700 <1> dw gdt_end-gdt-1
107 000000D0 00001000 <1> dd GDT_P
108 <1> gdt:
109 000000D4 00000000 <1> dd 0
110 000000D8 00000000 <1> dd 0
111 <1> KERNEL_CODE equ $-gdt
112 000000DC FFFF <1> dw 0xffff ;limit 15:0
113 000000DE 0000 <1> dw 0x0000 ;base 15:0
114 000000E0 00 <1> db 0x00 ;base 23:16
115 000000E1 9A <1> db 0x9A ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
116 000000E2 CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
117 000000E3 00 <1> db 0x00 ;base 31:24
118 <1> KERNEL_DATA equ $-gdt
119 000000E4 FFFF <1> dw 0xffff ;limit 15:0
120 000000E6 0000 <1> dw 0x0000 ;base 15:0
121 000000E8 00 <1> db 0x00 ;base 23:16
122 000000E9 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
123 000000EA CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
124 000000EB 00 <1> db 0x00 ;base 31:24
125 <1> VESA_CODE equ $-gdt
126 000000EC FFFF <1> dw 0xffff ;limit 15:0
127 000000EE 0000 <1> dw 0x0000 ;base 15:0
128 000000F0 00 <1> db 0x00 ;base 23:16
129 000000F1 9A <1> db 0x9A ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
130 000000F2 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
131 000000F3 00 <1> db 0x00 ;base 31:24
132 <1> VESA_DATA equ $-gdt
133 000000F4 FFFF <1> dw 0xffff ;limit 15:0
134 000000F6 0000 <1> dw 0x0000 ;base 15:0
135 000000F8 00 <1> db 0x00 ;base 23:16
136 000000F9 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
137 000000FA 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
138 000000FB 00 <1> db 0x00 ;base 31:24
139 <1> VIDEO_TEXT equ $-gdt
140 000000FC FF7F <1> dw 0x7FFF ;limit 15:0
141 000000FE 0080 <1> dw 0x8000 ;base 15:0
142 00000100 0B <1> db 0x0B ;base 23:16
143 00000101 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
144 00000102 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
145 00000103 00 <1> db 0x00 ;base 31:24
146 <1> VIDEO_GRAPHICS equ $-gdt
147 00000104 FFFF <1> dw 0xFFFF ;limit 15:0
148 00000106 0000 <1> dw 0x0000 ;base 15:0
149 00000108 0A <1> db 0x0A ;base 23:16
150 00000109 92 <1> db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
151 0000010A 40 <1> db 0x40 ;flags ([G][D/B][0][0]) / limit 19:16
152 0000010B 00 <1> db 0x00 ;base 31:24
153 <1> USER_CODE equ $-gdt
154 0000010C FFFF <1> dw 0xffff ;limit 15:0
155 0000010E 0000 <1> dw 0x0000 ;base 15:0
156 00000110 00 <1> db 0x00 ;base 23:16
157 00000111 FA <1> db 0xFA ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
158 00000112 CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
159 00000113 00 <1> db 0x00 ;base 31:24
160 <1> USER_DATA equ $-gdt
161 00000114 FFFF <1> dw 0xffff ;limit 15:0
162 00000116 0000 <1> dw 0x0000 ;base 15:0
163 00000118 00 <1> db 0x00 ;base 23:16
164 00000119 F2 <1> db 0xF2 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
165 0000011A CF <1> db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
166 0000011B 00 <1> db 0x00 ;base 31:24
167 <1> gdt_end:
168 <1>
169 <1>
170 <1>
171 %include "idt.inc"
172 <1> ;idt.inc
173 <1> ;Author: Josh Holtrop
174 <1> ;for HOS
175 <1> ;Modified: 10/30/03
176 <1>
177 <1> idtr:
178 0000011C 8F01 <1> dw 50*8-1 ;size of idt
179 0000011E 00201000 <1> dd IDT_P ;address of idt
180 <1>
181 <1>
182 <1> %macro isr_label 1
183 <1> isr_%1:
184 <1> push eax
185 <1> mov eax, %1
186 <1> jmp isr_main
187 <1> %endmacro
188 <1>
189 <1> isr_label 0
190 <2> isr_%1:
191 00000122 50 <2> push eax
192 00000123 B800000000 <2> mov eax, %1
193 00000128 E91B020000 <2> jmp isr_main
194 <1> isr_label 1
195 <2> isr_%1:
196 0000012D 50 <2> push eax
197 0000012E B801000000 <2> mov eax, %1
198 00000133 E910020000 <2> jmp isr_main
199 <1> isr_label 2
200 <2> isr_%1:
201 00000138 50 <2> push eax
202 00000139 B802000000 <2> mov eax, %1
203 0000013E E905020000 <2> jmp isr_main
204 <1> isr_label 3
205 <2> isr_%1:
206 00000143 50 <2> push eax
207 00000144 B803000000 <2> mov eax, %1
208 00000149 E9FA010000 <2> jmp isr_main
209 <1> isr_label 4
210 <2> isr_%1:
211 0000014E 50 <2> push eax
212 0000014F B804000000 <2> mov eax, %1
213 00000154 E9EF010000 <2> jmp isr_main
214 <1> isr_label 5
215 <2> isr_%1:
216 00000159 50 <2> push eax
217 0000015A B805000000 <2> mov eax, %1
218 0000015F E9E4010000 <2> jmp isr_main
219 <1> isr_label 6
220 <2> isr_%1:
221 00000164 50 <2> push eax
222 00000165 B806000000 <2> mov eax, %1
223 0000016A E9D9010000 <2> jmp isr_main
224 <1> isr_label 7
225 <2> isr_%1:
226 0000016F 50 <2> push eax
227 00000170 B807000000 <2> mov eax, %1
228 00000175 E9CE010000 <2> jmp isr_main
229 <1> isr_label 8
230 <2> isr_%1:
231 0000017A 50 <2> push eax
232 0000017B B808000000 <2> mov eax, %1
233 00000180 E9C3010000 <2> jmp isr_main
234 <1> isr_label 9
235 <2> isr_%1:
236 00000185 50 <2> push eax
237 00000186 B809000000 <2> mov eax, %1
238 0000018B E9B8010000 <2> jmp isr_main
239 <1> isr_label 10
240 <2> isr_%1:
241 00000190 50 <2> push eax
242 00000191 B80A000000 <2> mov eax, %1
243 00000196 E9AD010000 <2> jmp isr_main
244 <1> isr_label 11
245 <2> isr_%1:
246 0000019B 50 <2> push eax
247 0000019C B80B000000 <2> mov eax, %1
248 000001A1 E9A2010000 <2> jmp isr_main
249 <1> isr_label 12
250 <2> isr_%1:
251 000001A6 50 <2> push eax
252 000001A7 B80C000000 <2> mov eax, %1
253 000001AC E997010000 <2> jmp isr_main
254 <1> isr_label 13
255 <2> isr_%1:
256 000001B1 50 <2> push eax
257 000001B2 B80D000000 <2> mov eax, %1
258 000001B7 E98C010000 <2> jmp isr_main
259 <1> isr_label 14
260 <2> isr_%1:
261 000001BC 50 <2> push eax
262 000001BD B80E000000 <2> mov eax, %1
263 000001C2 E981010000 <2> jmp isr_main
264 <1> isr_label 15
265 <2> isr_%1:
266 000001C7 50 <2> push eax
267 000001C8 B80F000000 <2> mov eax, %1
268 000001CD E976010000 <2> jmp isr_main
269 <1> isr_label 16
270 <2> isr_%1:
271 000001D2 50 <2> push eax
272 000001D3 B810000000 <2> mov eax, %1
273 000001D8 E96B010000 <2> jmp isr_main
274 <1> isr_label 17
275 <2> isr_%1:
276 000001DD 50 <2> push eax
277 000001DE B811000000 <2> mov eax, %1
278 000001E3 E960010000 <2> jmp isr_main
279 <1> isr_label 18
280 <2> isr_%1:
281 000001E8 50 <2> push eax
282 000001E9 B812000000 <2> mov eax, %1
283 000001EE E955010000 <2> jmp isr_main
284 <1> isr_label 19
285 <2> isr_%1:
286 000001F3 50 <2> push eax
287 000001F4 B813000000 <2> mov eax, %1
288 000001F9 E94A010000 <2> jmp isr_main
289 <1> isr_label 20
290 <2> isr_%1:
291 000001FE 50 <2> push eax
292 000001FF B814000000 <2> mov eax, %1
293 00000204 E93F010000 <2> jmp isr_main
294 <1> isr_label 21
295 <2> isr_%1:
296 00000209 50 <2> push eax
297 0000020A B815000000 <2> mov eax, %1
298 0000020F E934010000 <2> jmp isr_main
299 <1> isr_label 22
300 <2> isr_%1:
301 00000214 50 <2> push eax
302 00000215 B816000000 <2> mov eax, %1
303 0000021A E929010000 <2> jmp isr_main
304 <1> isr_label 23
305 <2> isr_%1:
306 0000021F 50 <2> push eax
307 00000220 B817000000 <2> mov eax, %1
308 00000225 E91E010000 <2> jmp isr_main
309 <1> isr_label 24
310 <2> isr_%1:
311 0000022A 50 <2> push eax
312 0000022B B818000000 <2> mov eax, %1
313 00000230 E913010000 <2> jmp isr_main
314 <1> isr_label 25
315 <2> isr_%1:
316 00000235 50 <2> push eax
317 00000236 B819000000 <2> mov eax, %1
318 0000023B E908010000 <2> jmp isr_main
319 <1> isr_label 26
320 <2> isr_%1:
321 00000240 50 <2> push eax
322 00000241 B81A000000 <2> mov eax, %1
323 00000246 E9FD000000 <2> jmp isr_main
324 <1> isr_label 27
325 <2> isr_%1:
326 0000024B 50 <2> push eax
327 0000024C B81B000000 <2> mov eax, %1
328 00000251 E9F2000000 <2> jmp isr_main
329 <1> isr_label 28
330 <2> isr_%1:
331 00000256 50 <2> push eax
332 00000257 B81C000000 <2> mov eax, %1
333 0000025C E9E7000000 <2> jmp isr_main
334 <1> isr_label 29
335 <2> isr_%1:
336 00000261 50 <2> push eax
337 00000262 B81D000000 <2> mov eax, %1
338 00000267 E9DC000000 <2> jmp isr_main
339 <1> isr_label 30
340 <2> isr_%1:
341 0000026C 50 <2> push eax
342 0000026D B81E000000 <2> mov eax, %1
343 00000272 E9D1000000 <2> jmp isr_main
344 <1> isr_label 31
345 <2> isr_%1:
346 00000277 50 <2> push eax
347 00000278 B81F000000 <2> mov eax, %1
348 0000027D E9C6000000 <2> jmp isr_main
349 <1> isr_label 32
350 <2> isr_%1:
351 00000282 50 <2> push eax
352 00000283 B820000000 <2> mov eax, %1
353 00000288 E9BB000000 <2> jmp isr_main
354 <1> isr_label 33
355 <2> isr_%1:
356 0000028D 50 <2> push eax
357 0000028E B821000000 <2> mov eax, %1
358 00000293 E9B0000000 <2> jmp isr_main
359 <1> isr_label 34
360 <2> isr_%1:
361 00000298 50 <2> push eax
362 00000299 B822000000 <2> mov eax, %1
363 0000029E E9A5000000 <2> jmp isr_main
364 <1> isr_label 35
365 <2> isr_%1:
366 000002A3 50 <2> push eax
367 000002A4 B823000000 <2> mov eax, %1
368 000002A9 E99A000000 <2> jmp isr_main
369 <1> isr_label 36
370 <2> isr_%1:
371 000002AE 50 <2> push eax
372 000002AF B824000000 <2> mov eax, %1
373 000002B4 E98F000000 <2> jmp isr_main
374 <1> isr_label 37
375 <2> isr_%1:
376 000002B9 50 <2> push eax
377 000002BA B825000000 <2> mov eax, %1
378 000002BF E984000000 <2> jmp isr_main
379 <1> isr_label 38
380 <2> isr_%1:
381 000002C4 50 <2> push eax
382 000002C5 B826000000 <2> mov eax, %1
383 000002CA E979000000 <2> jmp isr_main
384 <1> isr_label 39
385 <2> isr_%1:
386 000002CF 50 <2> push eax
387 000002D0 B827000000 <2> mov eax, %1
388 000002D5 E96E000000 <2> jmp isr_main
389 <1> isr_label 40
390 <2> isr_%1:
391 000002DA 50 <2> push eax
392 000002DB B828000000 <2> mov eax, %1
393 000002E0 E963000000 <2> jmp isr_main
394 <1> isr_label 41
395 <2> isr_%1:
396 000002E5 50 <2> push eax
397 000002E6 B829000000 <2> mov eax, %1
398 000002EB E958000000 <2> jmp isr_main
399 <1> isr_label 42
400 <2> isr_%1:
401 000002F0 50 <2> push eax
402 000002F1 B82A000000 <2> mov eax, %1
403 000002F6 E94D000000 <2> jmp isr_main
404 <1> isr_label 43
405 <2> isr_%1:
406 000002FB 50 <2> push eax
407 000002FC B82B000000 <2> mov eax, %1
408 00000301 E942000000 <2> jmp isr_main
409 <1> isr_label 44
410 <2> isr_%1:
411 00000306 50 <2> push eax
412 00000307 B82C000000 <2> mov eax, %1
413 0000030C E937000000 <2> jmp isr_main
414 <1> isr_label 45
415 <2> isr_%1:
416 00000311 50 <2> push eax
417 00000312 B82D000000 <2> mov eax, %1
418 00000317 E92C000000 <2> jmp isr_main
419 <1> isr_label 46
420 <2> isr_%1:
421 0000031C 50 <2> push eax
422 0000031D B82E000000 <2> mov eax, %1
423 00000322 E921000000 <2> jmp isr_main
424 <1> isr_label 47
425 <2> isr_%1:
426 00000327 50 <2> push eax
427 00000328 B82F000000 <2> mov eax, %1
428 0000032D E916000000 <2> jmp isr_main
429 <1> isr_label 48
430 <2> isr_%1:
431 00000332 50 <2> push eax
432 00000333 B830000000 <2> mov eax, %1
433 00000338 E90B000000 <2> jmp isr_main
434 <1> isr_label 49
435 <2> isr_%1:
436 0000033D 50 <2> push eax
437 0000033E B831000000 <2> mov eax, %1
438 00000343 E900000000 <2> jmp isr_main
439 <1>
440 <1> isr_main:
441 00000348 60 <1> pusha
442 00000349 1E <1> push ds
443 0000034A 06 <1> push es
444 <1>
445 0000034B 50 <1> push eax
446 <1>
447 0000034C E8(00000000) <1> call _isr
448 <1>
449 00000351 58 <1> pop eax
450 <1>
451 00000352 07 <1> pop es
452 00000353 1F <1> pop ds
453 00000354 61 <1> popa
454 00000355 58 <1> pop eax
455 <1>
456 00000356 CF <1> iret
457 <1>
458 <1>
459 <1>
460 <1>
461 <1>
462 <1>
463 <1>
464
465
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