/[gxemul]/trunk/src/dec_prom.c
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Contents of /trunk/src/dec_prom.c

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Revision 6 - (show annotations)
Mon Oct 8 16:18:11 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 19383 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.772 2005/06/04 12:02:16 debug Exp $
20050428	Disabling the "-fmove-all-movables" option in the configure
		script, because it causes the compile to fail on OpenBSD/sgi.
20050502	Minor updates.
20050503	Removing the WRT54G mode (it was bogus anyway), and adding a
		comment about Windows NT for MIPS in doc/experiments.html.
		Minor updates to the x86 instruction decoding.
20050504	Adding some more x86 instructions.
		Adding support for reading files from ISO9660 CDROMs (including
		gzipped files). It's an ugly hack, but it seems to work.
		Various other minor updates (dev_vga.c, pc_bios.c etc).
20050505	Some more x86-related updates.
		Beginning (what I hope will be) a major code cleanup phase.
		"bootris" (an x86 bootsector) runs :-)
20050506	Adding some more x86 instructions.
20050507	tmpnam => mkstemp.
		Working on a hack to allow VGA charcells to be shown even when
		not running with X11.
		Adding more x86 instructions.
20050508	x86 32-bit SIB addressing fix, and more instructions.
20050509	Adding more x86 instructions.
20050510	Minor documentation updates, and other updates (x86 stuff etc.)
20050511	More x86-related updates.
20050513	Various updates, mostly x86-related. (Trying to fix flag 
		calculation, factoring out the ugly shift/rotate code, and
		some other things.)
20050514	Adding support for loading some old i386 a.out executables.
		Finally beginning the cleanup of machine/PROM/bios dependant
		info.
		Some minor documentation updates.
		Trying to clean up ARCBIOS stuff a little.
20050515	Trying to make it possible to actually use more than one disk
		type per machine (floppy, ide, scsi).
		Trying to clean up the kbd vs PROM console stuff. (For PC and
		ARC emulation modes, mostly.)
		Beginning to add an 8259 interrupt controller, and connecting
		it to the x86 emulation.
20050516	The first x86 interrupts seem to work (keyboard stuff).
		Adding a 8253/8254 programmable interval timer skeleton.
		FreeDOS now reaches a command prompt and can be interacted
		with.
20050517	After some bugfixes, MS-DOS also (sometimes) reaches a
		command prompt now.
		Trying to fix the pckbc to work with MS-DOS' keyb.com, but no
		success yet.
20050518	Adding a simple 32-bit x86 MMU skeleton.
20050519	Some more work on the x86 stuff. (Beginning the work on paging,
		and various other fixes).
20050520	More updates. Working on dev_vga (4-bit graphics modes), adding
		40 columns support to the PC bios emulation.
		Trying to add support for resizing windows when switching
		between graphics modes.
20050521	Many more x86-related updates.
20050522	Correcting the initial stack pointer's sign-extension for
		ARCBIOS emulation (thanks to Alec Voropay for noticing the
		error).
		Continuing on the cleanup (ARCBIOS etc).
		dev_vga updates.
20050523	More x86 updates: trying to add some support for protected mode
		interrupts (via gate descriptors) and many other fixes.
		More ARCBIOS cleanup.
		Adding a device flag which indicates that reads cause no
		side-effects. (Useful for the "dump" command in the debugger,
		and other things.)
		Adding support for directly starting up x86 ELFs, skipping the
		bootloader stage. (Most ELFs, however, are not suitable for
		this.)
20050524	Adding simple 32-bit x86 TSS task switching, but no privilege
		level support yet.
		More work on dev_vga. A small "Copper bars" demo works. :-)
		Adding support for Trap Flag (single-step exceptions), at least
		in real mode, and various other x86-related fixes.
20050525	Adding a new disk image prefix (gH;S;) which can be used to
		override the default nr of heads and sectors per track.
20050527	Various bug fixes, more work on the x86 mode (stack change on
		interrupts between different priv.levels), and some minor
		documentation updates.
20050528	Various fixes (x86 stuff).
20050529	More x86 fixes. An OpenBSD/i386 bootfloppy reaches userland
		and can be interacted with (although there are problems with
		key repetition). NetBSD/i386 triggers a serious CISC-related
		problem: instruction fetches across page boundaries, where
		the later part isn't actually part of the instruction.
20050530	Various minor updates. (Documentation updates, etc.)
20050531	Adding some experimental code (experiments/new_test_*) which
		could be useful for dynamic (but not binary) translation in
		the future.
20050602	Adding a dummy ARM skeleton.
		Fixing the pckbc key repetition problem (by adding release
		scancodes for all keypresses).
20050603	Minor updates for the next release.
20050604	Release testing. Minor updates.

==============  RELEASE 0.3.3  ==============

20050604	There'll probably be a 0.3.3.1 release soon, with some very
		very tiny updates.


1 /*
2 * Copyright (C) 2003-2005 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * $Id: dec_prom.c,v 1.58 2005/05/15 01:55:49 debug Exp $
29 *
30 * DECstation PROM emulation.
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <sys/types.h>
37 #include <sys/time.h>
38 #include <sys/resource.h>
39
40 #include "console.h"
41 #include "cpu.h"
42 #include "cpu_mips.h"
43 #include "diskimage.h"
44 #include "machine.h"
45 #include "memory.h"
46 #include "misc.h"
47
48 #include "dec_prom.h"
49 #include "dec_5100.h"
50 #include "dec_kn01.h"
51 #include "dec_kn02.h"
52 #include "dec_kn03.h"
53
54
55 extern int quiet_mode;
56
57
58 /*
59 * mem_readchar():
60 *
61 * Reads a byte from emulated RAM, using a MIPS register as a base address.
62 * (Helper function.)
63 */
64 static unsigned char mem_readchar(struct cpu *cpu, int regbase, int offset)
65 {
66 unsigned char ch;
67 cpu->memory_rw(cpu, cpu->mem, cpu->cd.mips.gpr[regbase] + offset,
68 &ch, sizeof(ch), MEM_READ, CACHE_DATA | NO_EXCEPTIONS);
69 return ch;
70 }
71
72
73 /*
74 * dec_jumptable_func():
75 *
76 * The jumptable is located at the beginning of the PROM, at 0xbfc00000 + i*8,
77 * where i is the decimal function number. Many of these can be converted to
78 * an identical callback function.
79 *
80 * Return value is non-zero if the vector number was converted into a callback
81 * function number, otherwise 0.
82 *
83 * Vector (dec) Function
84 * 0x0 0 reset()
85 * 0x10 2 restart()
86 * 0x18 3 reinit()
87 * 0x30 6 open()
88 * 0x38 7 read()
89 * 0x58 11 lseek()
90 * 0x68 13 putchar()
91 * 0x88 17 printf()
92 * 0x108 33 getenv2()
93 */
94 int dec_jumptable_func(struct cpu *cpu, int vector)
95 {
96 int i;
97 static int file_opened = 0;
98 static int current_file_offset = 0;
99
100 switch (vector) {
101 case 0x0: /* reset() */
102 /* TODO */
103 cpu->machine->exit_without_entering_debugger = 1;
104 cpu->running = 0;
105 cpu->dead = 1;
106 break;
107 case 0x10: /* restart() */
108 /* TODO */
109 cpu->machine->exit_without_entering_debugger = 1;
110 cpu->running = 0;
111 cpu->dead = 1;
112 break;
113 case 0x18: /* reinit() */
114 /* TODO */
115 cpu->machine->exit_without_entering_debugger = 1;
116 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
117 break;
118 case 0x30: /* open() */
119 /*
120 * TODO: This is just a hack to allow Sprite/pmax' bootblock
121 * code to load /vmsprite. The filename argument (in A0)
122 * is ignored, and a file handle value of 1 is returned.
123 */
124 if (file_opened) {
125 fatal("\ndec_jumptable_func(): opening more than one "
126 "file isn't supported yet.\n");
127 cpu->running = 0;
128 cpu->dead = 1;
129 }
130 file_opened = 1;
131 cpu->cd.mips.gpr[MIPS_GPR_V0] = 1;
132 break;
133 case 0x38: /* read(handle, ptr, length) */
134 cpu->cd.mips.gpr[MIPS_GPR_V0] = -1;
135 if ((int32_t)cpu->cd.mips.gpr[MIPS_GPR_A2] > 0) {
136 int disk_id = diskimage_bootdev(cpu->machine, NULL);
137 int res;
138 unsigned char *tmp_buf;
139
140 tmp_buf = malloc(cpu->cd.mips.gpr[MIPS_GPR_A2]);
141 if (tmp_buf == NULL) {
142 fprintf(stderr, "[ *** Out of memory in "
143 "dec_prom.c, allocating %i bytes ]\n",
144 (int)cpu->cd.mips.gpr[MIPS_GPR_A2]);
145 break;
146 }
147
148 res = diskimage_access(cpu->machine, disk_id,
149 DISKIMAGE_SCSI, 0, current_file_offset, tmp_buf,
150 cpu->cd.mips.gpr[MIPS_GPR_A2]);
151
152 /* If the transfer was successful, transfer the data
153 to emulated memory: */
154 if (res) {
155 uint64_t dst = cpu->cd.mips.gpr[MIPS_GPR_A1];
156 store_buf(cpu, dst, (char *)tmp_buf,
157 cpu->cd.mips.gpr[MIPS_GPR_A2]);
158 cpu->cd.mips.gpr[MIPS_GPR_V0] =
159 cpu->cd.mips.gpr[MIPS_GPR_A2];
160 current_file_offset +=
161 cpu->cd.mips.gpr[MIPS_GPR_A2];
162 }
163
164 free(tmp_buf);
165 }
166 break;
167 case 0x58: /* lseek(handle, offset[, whence]) */
168 /* TODO */
169 if (cpu->cd.mips.gpr[MIPS_GPR_A2] == 0)
170 current_file_offset = cpu->cd.mips.gpr[MIPS_GPR_A1];
171 else
172 fatal("WARNING! Unimplemented whence in "
173 "dec_jumptable_func()\n");
174 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
175 break;
176 case 0x68: /* putchar() */
177 console_putchar(cpu->machine->main_console_handle,
178 cpu->cd.mips.gpr[MIPS_GPR_A0]);
179 break;
180 case 0x88: /* printf() */
181 return 0x30;
182 case 0x108: /* getenv2() */
183 return 0x64;
184 default:
185 cpu_register_dump(cpu->machine, cpu, 1, 0x1);
186 printf("a0 points to: ");
187 for (i=0; i<40; i++) {
188 unsigned char ch = '\0';
189 cpu->memory_rw(cpu, cpu->mem,
190 cpu->cd.mips.gpr[MIPS_GPR_A0] + i, &ch,
191 sizeof(ch), MEM_READ, CACHE_DATA | NO_EXCEPTIONS);
192 if (ch >= ' ' && ch < 126)
193 printf("%c", ch);
194 else
195 printf("[%02x]", ch);
196 }
197 printf("\n");
198 fatal("PROM emulation: unimplemented JUMP TABLE vector "
199 "0x%x (decimal function %i)\n", vector, vector/8);
200 cpu->running = 0;
201 cpu->dead = 1;
202 }
203
204 return 0;
205 }
206
207
208 /*
209 * decstation_prom_emul():
210 *
211 * DECstation PROM emulation.
212 *
213 * Callback functions:
214 * 0x0c strcmp()
215 * 0x14 strlen()
216 * 0x24 getchar()
217 * 0x28 gets()
218 * 0x2c puts()
219 * 0x30 printf()
220 * 0x38 iopoll()
221 * 0x54 bootinit()
222 * 0x58 bootread()
223 * 0x64 getenv()
224 * 0x6c slot_address()
225 * 0x70 wbflush()
226 * 0x7c clear_cache()
227 * 0x80 getsysid()
228 * 0x84 getbitmap()
229 * 0x88 disableintr()
230 * 0x8c enableintr()
231 * 0x9c halt()
232 * 0xa4 gettcinfo()
233 * 0xa8 execute_cmd()
234 * 0xac rex()
235 */
236 int decstation_prom_emul(struct cpu *cpu)
237 {
238 int i, j, ch, argreg, argdata;
239 int vector = cpu->pc & 0xfff;
240 int callback = (cpu->pc & 0xf000)? 1 : 0;
241 unsigned char buf[100];
242 unsigned char ch1, ch2, ch3;
243 uint64_t tmpaddr, slot_base = 0x10000000, slot_size = 0;
244
245 if (!callback) {
246 vector = dec_jumptable_func(cpu, vector);
247 if (vector == 0)
248 return 1;
249 } else {
250 /* Vector number is n*4, PC points to n*8. */
251 vector /= 2;
252 }
253
254 switch (vector) {
255 case 0x0c: /* strcmp(): */
256 i = j = 0;
257 do {
258 ch1 = mem_readchar(cpu, MIPS_GPR_A0, i++);
259 ch2 = mem_readchar(cpu, MIPS_GPR_A1, j++);
260 } while (ch1 == ch2 && ch1 != '\0');
261
262 /* If ch1=='\0', then strings are equal. */
263 if (ch1 == '\0')
264 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
265 if ((signed char)ch1 > (signed char)ch2)
266 cpu->cd.mips.gpr[MIPS_GPR_V0] = 1;
267 if ((signed char)ch1 < (signed char)ch2)
268 cpu->cd.mips.gpr[MIPS_GPR_V0] = -1;
269 break;
270 case 0x14: /* strlen(): */
271 i = 0;
272 do {
273 ch2 = mem_readchar(cpu, MIPS_GPR_A0, i++);
274 } while (ch2 != 0);
275 cpu->cd.mips.gpr[MIPS_GPR_V0] = i - 1;
276 break;
277 case 0x24: /* getchar() */
278 /* debug("[ DEC PROM getchar() ]\n"); */
279 cpu->cd.mips.gpr[MIPS_GPR_V0] = console_readchar(
280 cpu->machine->main_console_handle);
281 break;
282 case 0x28: /* gets() */
283 /* debug("[ DEC PROM gets() ]\n"); */
284 tmpaddr = cpu->cd.mips.gpr[MIPS_GPR_A0];
285 i = 0;
286
287 /* TODO: Make this not hang (block) the entire emulator */
288
289 do {
290 while ((ch = console_readchar(
291 cpu->machine->main_console_handle)) < 1)
292 ;
293 if (ch == '\r')
294 ch = '\n';
295 ch2 = ch;
296
297 if (ch == '\b') {
298 if (i > 0) {
299 console_putchar(cpu->machine->
300 main_console_handle, ch2);
301 console_putchar(cpu->machine->
302 main_console_handle, ' ');
303 console_putchar(cpu->machine->
304 main_console_handle, ch2);
305 }
306 } else
307 console_putchar(cpu->machine->
308 main_console_handle, ch2);
309
310 fflush(stdout);
311
312 if (ch == '\n') {
313 /* It seems that trailing newlines
314 are not included in the buffer. */
315 } else if (ch != '\b') {
316 cpu->memory_rw(cpu, cpu->mem,
317 cpu->cd.mips.gpr[MIPS_GPR_A0] + i,
318 &ch2, sizeof(ch2), MEM_WRITE,
319 CACHE_DATA | NO_EXCEPTIONS);
320 i++;
321 } else {
322 if (i > 0)
323 i--;
324 }
325 } while (ch2 != '\n');
326
327 /* Trailing nul-byte: */
328 ch2 = '\0';
329 cpu->memory_rw(cpu, cpu->mem, cpu->cd.mips.gpr[MIPS_GPR_A0] +
330 i, &ch2, sizeof(ch2), MEM_WRITE,
331 CACHE_DATA | NO_EXCEPTIONS);
332
333 /* Return the input argument: */
334 cpu->cd.mips.gpr[MIPS_GPR_V0] = cpu->cd.mips.gpr[MIPS_GPR_A0];
335 break;
336 case 0x2c: /* puts() */
337 i = 0;
338 while ((ch = mem_readchar(cpu, MIPS_GPR_A0, i++)) != '\0')
339 console_putchar(cpu->machine->main_console_handle, ch);
340 console_putchar(cpu->machine->main_console_handle, '\n');
341 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
342 break;
343 case 0x30: /* printf() */
344 if (cpu->machine->register_dump ||
345 cpu->machine->instruction_trace)
346 debug("PROM printf(0x%08lx): \n",
347 (long)cpu->cd.mips.gpr[MIPS_GPR_A0]);
348
349 i = 0; ch = -1; argreg = MIPS_GPR_A1;
350 while (ch != '\0') {
351 char printfbuf[8000];
352 int x;
353
354 printfbuf[0] = printfbuf[sizeof(printfbuf)-1] = '\0';
355
356 ch = mem_readchar(cpu, MIPS_GPR_A0, i++);
357 switch (ch) {
358 case '%':
359 ch = '0';
360 while (ch >= '0' && ch <= '9')
361 ch = mem_readchar(cpu,
362 MIPS_GPR_A0, i++);
363
364 switch (ch) {
365 case '%':
366 strcpy(printfbuf, "%%");
367 break;
368 case 'c':
369 case 'd':
370 case 's':
371 case 'x':
372 /* Get argument: */
373 if (argreg > MIPS_GPR_A3) {
374 #if 1
375 /* Linux booters seem to go
376 over the edge sometimes: */
377 ch = '\0';
378 strcpy(printfbuf, "[...]\n");
379 #else
380 printf("[ decstation_prom_emul"
381 "(): too many arguments ]");
382 /* This reuses the last arg,
383 which is utterly incorrect.
384 (TODO) */
385 argreg = MIPS_GPR_A3;
386 #endif
387 }
388
389 ch2 = argdata =
390 cpu->cd.mips.gpr[argreg];
391
392 switch (ch) {
393 case 'c':
394 sprintf(printfbuf, "%c", ch2);
395 break;
396 case 'd':
397 sprintf(printfbuf, "%d",
398 argdata);
399 break;
400 case 'x':
401 sprintf(printfbuf, "%x",
402 argdata);
403 break;
404 case 's':
405 /* Print a "%s" string. */
406 j = 0; ch3 = '\n';
407 while (ch2) {
408 ch2 = mem_readchar(cpu,
409 argreg, j++);
410 if (ch2) {
411 snprintf(
412 printfbuf +
413 strlen(
414 printfbuf),
415 sizeof(
416 printfbuf)-
417 1-strlen(
418 printfbuf),
419 "%c", ch2);
420 ch3 = ch2;
421 }
422 }
423 break;
424 }
425 argreg ++;
426 break;
427 default:
428 printf("[ unknown printf format char"
429 " '%c' ]", ch);
430 }
431 break;
432 case '\0':
433 break;
434 default:
435 sprintf(printfbuf, "%c", ch);
436 }
437
438 printfbuf[sizeof(printfbuf)-1] = '\0';
439
440 for (x=0; x<strlen(printfbuf); x++)
441 console_putchar(cpu->machine->
442 main_console_handle, printfbuf[x]);
443 }
444 if (cpu->machine->register_dump ||
445 cpu->machine->instruction_trace)
446 debug("\n");
447 fflush(stdout);
448 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
449 break;
450 case 0x54: /* bootinit() */
451 /* debug("[ DEC PROM bootinit(0x%08x): TODO ]\n",
452 (int)cpu->cd.mips.gpr[MIPS_GPR_A0]); */
453 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
454 break;
455 case 0x58: /* bootread(int b, void *buffer, int n) */
456 /*
457 * Read data from the boot device.
458 * b is a sector number (512 bytes per sector),
459 * buffer is the destination address, and n
460 * is the number of _bytes_ to read.
461 *
462 * TODO: Return value? NetBSD thinks that 0 is ok.
463 */
464 debug("[ DEC PROM bootread(0x%x, 0x%08x, 0x%x) ]\n",
465 (int)cpu->cd.mips.gpr[MIPS_GPR_A0],
466 (int)cpu->cd.mips.gpr[MIPS_GPR_A1],
467 (int)cpu->cd.mips.gpr[MIPS_GPR_A2]);
468
469 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
470
471 if ((int32_t)cpu->cd.mips.gpr[MIPS_GPR_A2] > 0) {
472 int disk_id = diskimage_bootdev(cpu->machine, NULL);
473 int res;
474 unsigned char *tmp_buf;
475
476 tmp_buf = malloc(cpu->cd.mips.gpr[MIPS_GPR_A2]);
477 if (tmp_buf == NULL) {
478 fprintf(stderr, "[ *** Out of memory in "
479 "dec_prom.c, allocating %i bytes ]\n",
480 (int)cpu->cd.mips.gpr[MIPS_GPR_A2]);
481 break;
482 }
483
484 res = diskimage_access(cpu->machine, disk_id,
485 DISKIMAGE_SCSI, 0,
486 cpu->cd.mips.gpr[MIPS_GPR_A0] * 512, tmp_buf,
487 cpu->cd.mips.gpr[MIPS_GPR_A2]);
488
489 /* If the transfer was successful, transfer the data
490 to emulated memory: */
491 if (res) {
492 uint64_t dst = cpu->cd.mips.gpr[MIPS_GPR_A1];
493 if (dst < 0x80000000ULL)
494 dst |= 0x80000000;
495
496 store_buf(cpu, dst, (char *)tmp_buf,
497 cpu->cd.mips.gpr[MIPS_GPR_A2]);
498 cpu->cd.mips.gpr[MIPS_GPR_V0] =
499 cpu->cd.mips.gpr[MIPS_GPR_A2];
500 }
501
502 free(tmp_buf);
503 }
504 break;
505 case 0x64: /* getenv() */
506 /* Find the environment variable given by a0: */
507 for (i=0; i<sizeof(buf); i++)
508 cpu->memory_rw(cpu, cpu->mem,
509 cpu->cd.mips.gpr[MIPS_GPR_A0] + i, &buf[i],
510 sizeof(char), MEM_READ, CACHE_DATA | NO_EXCEPTIONS);
511 buf[sizeof(buf)-1] = '\0';
512 debug("[ DEC PROM getenv(\"%s\") ]\n", buf);
513 for (i=0; i<0x1000; i++) {
514 /* Matching string at offset i? */
515 int nmatches = 0;
516 for (j=0; j<strlen((char *)buf); j++) {
517 cpu->memory_rw(cpu, cpu->mem, (uint64_t)
518 (DEC_PROM_STRINGS + i + j), &ch2,
519 sizeof(char), MEM_READ, CACHE_DATA |
520 NO_EXCEPTIONS);
521 if (ch2 == buf[j])
522 nmatches++;
523 }
524 cpu->memory_rw(cpu, cpu->mem,
525 (uint64_t)(DEC_PROM_STRINGS
526 + i + strlen((char *)buf)), &ch2, sizeof(char),
527 MEM_READ, CACHE_DATA | NO_EXCEPTIONS);
528 if (nmatches == strlen((char *)buf) && ch2 == '=') {
529 cpu->cd.mips.gpr[MIPS_GPR_V0] =
530 DEC_PROM_STRINGS + i +
531 strlen((char *)buf) + 1;
532 return 1;
533 }
534 }
535 /* Return NULL if string wasn't found. */
536 fatal("[ DEC PROM getenv(\"%s\"): WARNING: Not in "
537 "environment! ]\n", buf);
538 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
539 break;
540 case 0x6c: /* ulong slot_address(int sn) */
541 debug("[ DEC PROM slot_address(%i) ]\n",
542 (int)cpu->cd.mips.gpr[MIPS_GPR_A0]);
543 /* TODO: This is too hardcoded. */
544 /* TODO 2: Should these be physical or virtual addresses? */
545 switch (cpu->machine->machine_subtype) {
546 case MACHINE_DEC_3MAX_5000:
547 slot_base = KN02_PHYS_TC_0_START;/* 0x1e000000 */
548 slot_size = 4*1048576; /* 4 MB */
549 break;
550 case MACHINE_DEC_3MIN_5000:
551 slot_base = 0x10000000;
552 slot_size = 0x4000000; /* 64 MB */
553 break;
554 case MACHINE_DEC_3MAXPLUS_5000:
555 slot_base = 0x1e000000;
556 slot_size = 0x800000; /* 8 MB */
557 break;
558 case MACHINE_DEC_MAXINE_5000:
559 slot_base = 0x10000000;
560 slot_size = 0x4000000; /* 64 MB */
561 break;
562 default:
563 fatal("warning: DEC PROM slot_address() "
564 "unimplemented for this machine type\n");
565 }
566 cpu->cd.mips.gpr[MIPS_GPR_V0] = (int64_t)(int32_t)
567 (0x80000000 + slot_base + slot_size *
568 cpu->cd.mips.gpr[MIPS_GPR_A0]);
569 break;
570 case 0x70: /* wbflush() */
571 debug("[ DEC PROM wbflush(): TODO ]\n");
572 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
573 break;
574 case 0x7c: /* clear_cache(addr, len) */
575 debug("[ DEC PROM clear_cache(0x%x,%i) ]\n",
576 (uint32_t)cpu->cd.mips.gpr[MIPS_GPR_A0],
577 (int)cpu->cd.mips.gpr[MIPS_GPR_A1]);
578 /* TODO */
579 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0; /* ? */
580 break;
581 case 0x80: /* getsysid() */
582 /* debug("[ DEC PROM getsysid() ]\n"); */
583 /* TODO: why did I add the 0x82 stuff??? */
584 cpu->cd.mips.gpr[MIPS_GPR_V0] = ((uint32_t)0x82 << 24)
585 + (cpu->machine->machine_subtype << 16) + (0x3 << 8);
586 cpu->cd.mips.gpr[MIPS_GPR_V0] =
587 (int64_t)(int32_t)cpu->cd.mips.gpr[MIPS_GPR_V0];
588 break;
589 case 0x84: /* getbitmap() */
590 debug("[ DEC PROM getbitmap(0x%08x) ]\n",
591 (int)cpu->cd.mips.gpr[MIPS_GPR_A0]);
592 store_buf(cpu, cpu->cd.mips.gpr[MIPS_GPR_A0],
593 (char *)&memmap, sizeof(memmap));
594 cpu->cd.mips.gpr[MIPS_GPR_V0] = sizeof((memmap.bitmap));
595 break;
596 case 0x88: /* disableintr() */
597 debug("[ DEC PROM disableintr(): TODO ]\n");
598 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
599 break;
600 case 0x8c: /* enableintr() */
601 debug("[ DEC PROM enableintr(): TODO ]\n");
602 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
603 break;
604 case 0x9c: /* halt() */
605 debug("[ DEC PROM halt() ]\n");
606 cpu->machine->exit_without_entering_debugger = 1;
607 cpu->running = 0;
608 cpu->dead = 1;
609 break;
610 case 0xa4: /* gettcinfo() */
611 /*
612 * These are just bogus values... TODO
613 *
614 * 0: revision
615 * 4: clock period in nano seconds
616 * 8: slot size in megabytes TODO: not same for all models!
617 * 12: I/O timeout in cycles
618 * 16: DMA address range in megabytes
619 * 20: maximum DMA burst length
620 * 24: turbochannel parity (yes = 1)
621 * 28: reserved
622 */
623 store_32bit_word(cpu, DEC_PROM_TCINFO + 0, 0);
624 store_32bit_word(cpu, DEC_PROM_TCINFO + 4, 50);
625 store_32bit_word(cpu, DEC_PROM_TCINFO + 8, 4);
626 store_32bit_word(cpu, DEC_PROM_TCINFO + 12, 10);
627 store_32bit_word(cpu, DEC_PROM_TCINFO + 16, 1);
628 store_32bit_word(cpu, DEC_PROM_TCINFO + 20, 100);
629 store_32bit_word(cpu, DEC_PROM_TCINFO + 24, 0);
630 store_32bit_word(cpu, DEC_PROM_TCINFO + 28, 0);
631 cpu->cd.mips.gpr[MIPS_GPR_V0] = DEC_PROM_TCINFO;
632 break;
633 case 0xa8: /* int execute_cmd(char *) */
634 i = 0;
635 while ((ch = mem_readchar(cpu, MIPS_GPR_A0, i++)) != '\0')
636 console_putchar(cpu->machine->main_console_handle, ch);
637 console_putchar(cpu->machine->main_console_handle, '\n');
638 cpu->cd.mips.gpr[MIPS_GPR_V0] = 0;
639 break;
640 case 0xac: /* rex() */
641 debug("[ DEC PROM rex('%c') ]\n",
642 (int)cpu->cd.mips.gpr[MIPS_GPR_A0]);
643 switch (cpu->cd.mips.gpr[MIPS_GPR_A0]) {
644 case 'h':
645 debug("DEC PROM: rex('h') ==> halt\n");
646 cpu->machine->exit_without_entering_debugger = 1;
647 cpu->running = 0;
648 cpu->dead = 1;
649 break;
650 case 'b':
651 debug("DEC PROM: rex('b') ==> reboot: TODO "
652 "(halting CPU instead)\n");
653 cpu->machine->exit_without_entering_debugger = 1;
654 cpu->running = 0;
655 cpu->dead = 1;
656 break;
657 default:
658 fatal("DEC prom emulation: unknown rex() a0=0x%llx ("
659 "'%c')\n", (long long)cpu->cd.mips.gpr[MIPS_GPR_A0],
660 (char)cpu->cd.mips.gpr[MIPS_GPR_A0]);
661 cpu->running = 0;
662 cpu->dead = 1;
663 }
664 break;
665 default:
666 cpu_register_dump(cpu->machine, cpu, 1, 0x1);
667 printf("a0 points to: ");
668 for (i=0; i<40; i++) {
669 unsigned char ch = '\0';
670 cpu->memory_rw(cpu, cpu->mem,
671 cpu->cd.mips.gpr[MIPS_GPR_A0] + i, &ch,
672 sizeof(ch), MEM_READ, CACHE_DATA | NO_EXCEPTIONS);
673 if (ch >= ' ' && ch < 126)
674 printf("%c", ch);
675 else
676 printf("[%02x]", ch);
677 }
678 printf("\n");
679 fatal("PROM emulation: unimplemented callback vector 0x%x\n",
680 vector);
681 cpu->running = 0;
682 cpu->dead = 1;
683 }
684
685 return 1;
686 }
687

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