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1 | /* |
2 | * Copyright 1999 Egbert Eich | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that | |
7 | * copyright notice and this permission notice appear in supporting | |
8 | * documentation, and that the name of the authors not be used in | |
9 | * advertising or publicity pertaining to distribution of the software without | |
10 | * specific, written prior permission. The authors makes no representations | |
11 | * about the suitability of this software for any purpose. It is provided | |
12 | * "as is" without express or implied warranty. | |
13 | * | |
14 | * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
20 | * PERFORMANCE OF THIS SOFTWARE. | |
21 | */ | |
22 | #include <unistd.h> | |
23 | #include <fcntl.h> | |
24 | #include <stdio.h> | |
25 | #include <errno.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/types.h> | |
28 | #include <string.h> | |
29 | #include <stdlib.h> | |
30 | #include <signal.h> | |
31 | #include <sys/stat.h> | |
32 | #include <setjmp.h> | |
33 | #if defined(__alpha__) || defined (__ia64__) | |
34 | #include <sys/io.h> | |
35 | //#elif defined(HAVE_SYS_PERM) | |
36 | #else | |
37 | #include <sys/perm.h> | |
38 | #endif | |
39 | #include "v86bios.h" | |
40 | #include "pci.h" | |
41 | #include "AsmMacros.h" | |
42 | #include "vbios.h" | |
43 | ||
44 | void log_err(char *format, ...) __attribute__ ((format (printf, 1, 2))); | |
45 | ||
46 | #define SIZE 0x100000 | |
47 | #define VRAM_START 0xA0000 | |
48 | #define VRAM_SIZE 0x1FFFF | |
49 | #define V_BIOS_SIZE 0x1FFFF | |
50 | #define BIOS_START 0x7C00 /* default BIOS entry */ | |
51 | ||
52 | static CARD8 code[] = { 0xcd, 0x10, 0xf4 }; /* int 0x10, hlt */ | |
53 | // static CARD8 code13[] = { 0xcd, 0x13, 0xf4 }; /* int 0x13, hlt */ | |
54 | ||
55 | static int int10_bios_ok(void); | |
56 | static int map(void); | |
57 | static void unmap(void); | |
58 | static int map_vram(void); | |
59 | static void unmap_vram(void); | |
60 | static int copy_vbios(hd_data_t *hd_data); | |
61 | // static int copy_sbios(void); | |
62 | #if MAP_SYS_BIOS | |
63 | static int copy_sys_bios(hd_data_t *hd_data); | |
64 | #endif | |
65 | static int copy_bios_ram(hd_data_t *hd_data); | |
66 | static int setup_system_bios(hd_data_t *hd_data); | |
67 | static void setup_int_vect(void); | |
68 | static int chksum(CARD8 *start); | |
69 | ||
70 | void loadCodeToMem(unsigned char *ptr, CARD8 *code); | |
71 | ||
72 | static int vram_mapped = 0; | |
73 | static int int10inited = 0; | |
74 | ||
75 | static sigjmp_buf longjmp_buf; | |
76 | ||
77 | static void sigsegv_handler(int); | |
78 | ||
79 | int InitInt10(hd_data_t *hd_data, int pci_cfg_method) | |
80 | { | |
81 | if(geteuid()) return -1; | |
82 | ||
83 | if(!map()) return -1; | |
84 | ||
85 | if(!setup_system_bios(hd_data)) { | |
86 | unmap(); | |
87 | return -1; | |
88 | } | |
89 | ||
90 | setup_io(); | |
91 | ||
92 | if(iopl(3) < 0) { | |
93 | unmap(); | |
94 | return -1; | |
95 | } | |
96 | ||
97 | scan_pci(pci_cfg_method); | |
98 | ||
99 | for(; CurrentPci; CurrentPci = CurrentPci->next) { | |
100 | if(CurrentPci->active) break; | |
101 | } | |
102 | ||
103 | iopl(0); | |
104 | ||
105 | setup_int_vect(); | |
106 | ||
107 | if(!copy_vbios(hd_data)) { | |
108 | unmap(); | |
109 | return -1; | |
110 | } | |
111 | ||
112 | if(!map_vram() || !copy_bios_ram(hd_data)) { | |
113 | unmap(); | |
114 | return -1; | |
115 | } | |
116 | ||
117 | if(!int10_bios_ok()) { | |
118 | unmap(); | |
119 | return -1; | |
120 | } | |
121 | ||
122 | int10inited = 1; | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | ||
128 | void FreeInt10() | |
129 | { | |
130 | if(!int10inited) return; | |
131 | ||
132 | unmap_vram(); | |
133 | unmap(); | |
134 | ||
135 | int10inited = 0; | |
136 | } | |
137 | ||
138 | ||
139 | /* | |
140 | * Check whether int 0x10 points to some useful code. | |
141 | */ | |
142 | int int10_bios_ok() | |
143 | { | |
144 | unsigned cs, ip; | |
145 | unsigned char *p; | |
146 | ||
147 | ip = ((uint16_t *) 0)[0x10 * 2]; | |
148 | cs = ((uint16_t *) 0)[0x10 * 2 + 1]; | |
149 | ||
150 | p = (unsigned char *) ((cs << 4) + ip); | |
151 | ||
152 | log_err( | |
153 | " vbe: int 10h points to %04x:%04x: %02x %02x %02x %02x %02x %02x %02x %02x\n", | |
154 | cs, ip, | |
155 | p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] | |
156 | ); | |
157 | ||
158 | /* It can't possibly start with all zeros. */ | |
159 | if(!*(uint32_t *) p) { | |
160 | log_err(" vbe: oops, int 10h points into nirvana!\n"); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | return 1; | |
166 | } | |
167 | ||
168 | ||
169 | void sigsegv_handler(int num) | |
170 | { | |
171 | siglongjmp(longjmp_buf, num + 1000); | |
172 | } | |
173 | ||
174 | ||
175 | int CallInt10(int *ax, int *bx, int *cx, unsigned char *buf, int len, int cpuemu) | |
176 | { | |
177 | i86biosRegs bRegs; | |
178 | void (*old_sigsegv_handler)(int) = SIG_DFL; | |
179 | void (*old_sigill_handler)(int) = SIG_DFL; | |
180 | void (*old_sigtrap_handler)(int) = SIG_DFL; | |
181 | int jmp; | |
182 | ||
183 | if(!int10inited) return -1; | |
184 | memset(&bRegs, 0, sizeof bRegs); | |
185 | bRegs.ax = *ax; | |
186 | bRegs.bx = *bx; | |
187 | bRegs.cx = *cx; | |
188 | bRegs.dx = 0; | |
189 | bRegs.es = 0x7e0; | |
190 | bRegs.di = 0x0; | |
191 | if(buf) memcpy((unsigned char *) 0x7e00, buf, len); | |
192 | ||
193 | iopl(3); | |
194 | ||
195 | jmp = sigsetjmp(longjmp_buf, 1); | |
196 | ||
197 | if(!jmp) { | |
198 | old_sigsegv_handler = signal(SIGSEGV, sigsegv_handler); | |
199 | old_sigill_handler = signal(SIGILL, sigsegv_handler); | |
200 | old_sigtrap_handler = signal(SIGTRAP, sigsegv_handler); | |
201 | ||
202 | loadCodeToMem((unsigned char *) BIOS_START, code); | |
203 | do_x86(BIOS_START, &bRegs, cpuemu); | |
204 | } | |
205 | else { | |
206 | int10inited = 0; | |
207 | log_err("oops: got signal %d in vm86() code\n", jmp - 1000); | |
208 | } | |
209 | ||
210 | signal(SIGTRAP, old_sigtrap_handler); | |
211 | signal(SIGILL, old_sigill_handler); | |
212 | signal(SIGSEGV, old_sigsegv_handler); | |
213 | ||
214 | iopl(0); | |
215 | ||
216 | if(buf) memcpy(buf, (unsigned char *) 0x7e00, len); | |
217 | ||
218 | *ax = bRegs.ax; | |
219 | *bx = bRegs.bx; | |
220 | *cx = bRegs.cx; | |
221 | ||
222 | return bRegs.ax; | |
223 | } | |
224 | ||
225 | ||
226 | #if 0 | |
227 | int CallInt13(int *ax, int *bx, int *cx, int *dx, unsigned char *buf, int len, int cpuemu) | |
228 | { | |
229 | i86biosRegs bRegs; | |
230 | ||
231 | if(!int10inited) return -1; | |
232 | memset(&bRegs, 0, sizeof bRegs); | |
233 | bRegs.ax = *ax; | |
234 | bRegs.bx = *bx; | |
235 | bRegs.cx = *cx; | |
236 | bRegs.dx = *dx; | |
237 | bRegs.es = 0x7e0; | |
238 | bRegs.ds = 0x7e0; | |
239 | bRegs.di = 0x0; | |
240 | bRegs.si = 0x0; | |
241 | if(buf) memcpy((unsigned char *) 0x7e00, buf, len); | |
242 | ||
243 | iopl(3); | |
244 | ||
245 | loadCodeToMem((unsigned char *) BIOS_START, code13); | |
246 | do_x86(BIOS_START, &bRegs, cpuemu); | |
247 | ||
248 | iopl(0); | |
249 | ||
250 | if(buf) memcpy(buf, (unsigned char *) 0x7e00, len); | |
251 | ||
252 | *ax = bRegs.ax; | |
253 | *bx = bRegs.bx; | |
254 | *cx = bRegs.cx; | |
255 | *dx = bRegs.dx; | |
256 | ||
257 | return bRegs.ax; | |
258 | } | |
259 | #endif | |
260 | ||
261 | ||
262 | int map() | |
263 | { | |
264 | void* mem; | |
265 | ||
266 | mem = mmap(0, (size_t) SIZE, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); | |
267 | ||
268 | if(mem) { | |
269 | perror("anonymous map"); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | memset(mem, 0, SIZE); | |
274 | ||
275 | loadCodeToMem((unsigned char *) BIOS_START, code); | |
276 | ||
277 | return 1; | |
278 | } | |
279 | ||
280 | ||
281 | void unmap() | |
282 | { | |
283 | munmap(0, SIZE); | |
284 | } | |
285 | ||
286 | ||
287 | static int | |
288 | map_vram(void) | |
289 | { | |
290 | int mem_fd; | |
291 | ||
292 | #ifdef __ia64__ | |
293 | if ((mem_fd = open(MEM_FILE,O_RDWR | O_SYNC))<0) | |
294 | #else | |
295 | if ((mem_fd = open(MEM_FILE,O_RDWR))<0) | |
296 | #endif | |
297 | { | |
298 | perror("opening memory"); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | #ifndef __alpha__ | |
303 | if (mmap((void *) VRAM_START, (size_t) VRAM_SIZE, | |
304 | PROT_EXEC | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, | |
305 | mem_fd, VRAM_START) == (void *) -1) | |
306 | #else | |
307 | if (!_bus_base()) sparse_shift = 7; /* Uh, oh, JENSEN... */ | |
308 | if (!_bus_base_sparse()) sparse_shift = 0; | |
309 | if ((vram_map = mmap(0,(size_t) (VRAM_SIZE << sparse_shift), | |
310 | PROT_READ | PROT_WRITE, | |
311 | MAP_SHARED, | |
312 | mem_fd, (VRAM_START << sparse_shift) | |
313 | | _bus_base_sparse())) == (void *) -1) | |
314 | #endif | |
315 | { | |
316 | perror("mmap error in map_hardware_ram"); | |
317 | close(mem_fd); | |
318 | return (0); | |
319 | } | |
320 | vram_mapped = 1; | |
321 | close(mem_fd); | |
322 | return (1); | |
323 | } | |
324 | ||
325 | ||
326 | void unmap_vram() | |
327 | { | |
328 | if(!vram_mapped) return; | |
329 | ||
330 | munmap((void*) VRAM_START, VRAM_SIZE); | |
331 | ||
332 | vram_mapped = 0; | |
333 | } | |
334 | ||
335 | ||
336 | /* | |
337 | * Read video BIOS from /dev/mem. | |
338 | * | |
339 | * Return: | |
340 | * 0: failed | |
341 | * 1: ok | |
342 | */ | |
343 | int copy_vbios(hd_data_t *hd_data) | |
344 | { | |
345 | unsigned size; | |
346 | unsigned char tmp[3]; | |
347 | ||
348 | if(!hd_read_mmap(hd_data, MEM_FILE, tmp, V_BIOS, sizeof tmp)) { | |
349 | log_err("vbe: failed to read %u bytes at 0x%x\n", (unsigned) sizeof tmp, V_BIOS); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | if(tmp[0] != 0x55 || tmp[1] != 0xAA ) { | |
354 | log_err("vbe: no bios found at: 0x%x\n", V_BIOS); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | size = tmp[2] * 0x200; | |
359 | ||
360 | if(!hd_read_mmap(hd_data, MEM_FILE, (unsigned char *) V_BIOS, V_BIOS, size)) { | |
361 | log_err("vbe: failed to read %d bytes at 0x%x\n", size, V_BIOS); | |
362 | return 0; | |
363 | } | |
364 | ||
365 | return chksum((CARD8 *) V_BIOS) ? 1 : 0; | |
366 | } | |
367 | ||
368 | ||
369 | #if MAP_SYS_BIOS | |
370 | static int | |
371 | copy_sys_bios(hd_data_t *hd_data) | |
372 | { | |
373 | return hd_read_mmap(hd_data, MEM_FILE, (unsigned char *) 0xf0000, 0xf0000, 0xffff); | |
374 | } | |
375 | #endif | |
376 | ||
377 | ||
378 | static int copy_bios_ram(hd_data_t *hd_data) | |
379 | { | |
380 | return hd_read_mmap(hd_data, MEM_FILE, (unsigned char *) 0, 0, 0x1000); | |
381 | } | |
382 | ||
383 | void loadCodeToMem(unsigned char *ptr, CARD8 *code) | |
384 | { | |
385 | while((*ptr++ = *code++) != 0xf4 /* hlt */); | |
386 | ||
387 | return; | |
388 | } | |
389 | ||
390 | ||
391 | /* | |
392 | * here we are really paranoid about faking a "real" | |
393 | * BIOS. Most of this information was pulled from | |
394 | * dosem. | |
395 | */ | |
396 | static void | |
397 | setup_int_vect(void) | |
398 | { | |
399 | const CARD16 cs = 0x0000; | |
400 | const CARD16 ip = 0x0; | |
401 | int i; | |
402 | ||
403 | /* let the int vects point to the SYS_BIOS seg */ | |
404 | for (i=0; i<0x80; i++) { | |
405 | ((CARD16*)0)[i<<1] = ip; | |
406 | ((CARD16*)0)[(i<<1)+1] = cs; | |
407 | } | |
408 | /* video interrupts default location */ | |
409 | ((CARD16*)0)[(0x42<<1)+1] = 0xf000; | |
410 | ((CARD16*)0)[0x42<<1] = 0xf065; | |
411 | ((CARD16*)0)[(0x10<<1)+1] = 0xf000; | |
412 | ((CARD16*)0)[0x10<<1] = 0xf065; | |
413 | /* video param table default location (int 1d) */ | |
414 | ((CARD16*)0)[(0x1d<<1)+1] = 0xf000; | |
415 | ((CARD16*)0)[0x1d<<1] = 0xf0A4; | |
416 | /* font tables default location (int 1F) */ | |
417 | ((CARD16*)0)[(0x1f<<1)+1] = 0xf000; | |
418 | ((CARD16*)0)[0x1f<<1] = 0xfa6e; | |
419 | ||
420 | /* int 11 default location */ | |
421 | ((CARD16*)0)[(0x11<1)+1] = 0xf000; | |
422 | ((CARD16*)0)[0x11<<1] = 0xf84d; | |
423 | /* int 12 default location */ | |
424 | ((CARD16*)0)[(0x12<<1)+1] = 0xf000; | |
425 | ((CARD16*)0)[0x12<<1] = 0xf841; | |
426 | /* int 15 default location */ | |
427 | ((CARD16*)0)[(0x15<<1)+1] = 0xf000; | |
428 | ((CARD16*)0)[0x15<<1] = 0xf859; | |
429 | /* int 1A default location */ | |
430 | ((CARD16*)0)[(0x1a<<1)+1] = 0xf000; | |
431 | ((CARD16*)0)[0x1a<<1] = 0xff6e; | |
432 | /* int 05 default location */ | |
433 | ((CARD16*)0)[(0x05<<1)+1] = 0xf000; | |
434 | ((CARD16*)0)[0x05<<1] = 0xff54; | |
435 | /* int 08 default location */ | |
436 | ((CARD16*)0)[(0x8<<1)+1] = 0xf000; | |
437 | ((CARD16*)0)[0x8<<1] = 0xfea5; | |
438 | /* int 13 default location (fdd) */ | |
439 | ((CARD16*)0)[(0x13<<1)+1] = 0xf000; | |
440 | ((CARD16*)0)[0x13<<1] = 0xec59; | |
441 | /* int 0E default location */ | |
442 | ((CARD16*)0)[(0xe<<1)+1] = 0xf000; | |
443 | ((CARD16*)0)[0xe<<1] = 0xef57; | |
444 | /* int 17 default location */ | |
445 | ((CARD16*)0)[(0x17<<1)+1] = 0xf000; | |
446 | ((CARD16*)0)[0x17<<1] = 0xefd2; | |
447 | /* fdd table default location (int 1e) */ | |
448 | ((CARD16*)0)[(0x1e<<1)+1] = 0xf000; | |
449 | ((CARD16*)0)[0x1e<<1] = 0xefc7; | |
450 | } | |
451 | ||
452 | static int | |
453 | setup_system_bios(hd_data_t *hd_data) | |
454 | { | |
455 | char *date = "06/01/99"; | |
456 | char *eisa_ident = "PCI/ISA"; | |
457 | ||
458 | #if MAP_SYS_BIOS | |
459 | if (!copy_sys_bios(hd_data)) return 0; | |
460 | return 1; | |
461 | #endif | |
462 | // memset((void *)0xF0000,0xf4,0xfff7); | |
463 | ||
464 | /* | |
465 | * we trap the "industry standard entry points" to the BIOS | |
466 | * and all other locations by filling them with "hlt" | |
467 | * TODO: implement hlt-handler for these | |
468 | */ | |
469 | memset((void *)0xF0000,0xf4,0x10000); | |
470 | ||
471 | /* | |
472 | * TODO: we should copy the fdd table (0xfec59-0xfec5b) | |
473 | * the video parameter table (0xf0ac-0xf0fb) | |
474 | * and the font tables (0xfa6e-0xfe6d) | |
475 | * from the original bios here | |
476 | */ | |
477 | ||
478 | /* set bios date */ | |
479 | strcpy((char *)0xFFFF5,date); | |
480 | /* set up eisa ident string */ | |
481 | strcpy((char *)0xFFFD9,eisa_ident); | |
482 | /* write system model id for IBM-AT */ | |
483 | ((char *)0)[0xFFFFE] = 0xfc; | |
484 | ||
485 | return 1; | |
486 | } | |
487 | ||
488 | ||
489 | /* | |
490 | * Check BIOS CRC. | |
491 | * | |
492 | * Return: | |
493 | * 0: failed | |
494 | * 1: ok | |
495 | */ | |
496 | int chksum(CARD8 *start) | |
497 | { | |
498 | CARD16 size; | |
499 | CARD8 val = 0; | |
500 | int i; | |
501 | ||
502 | size = start[2] * 0x200; | |
503 | for(i = 0; i < size; i++) val += start[i]; | |
504 | ||
505 | if(!val) return 1; | |
506 | ||
507 | log_err("vbe: BIOS chksum wrong\n"); | |
508 | ||
509 | return 0; | |
510 | } | |
511 |