/[gxemul]/trunk/src/dec_prom.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Revision 6 - (hide annotations)
Mon Oct 8 16:18:11 2007 UTC (12 years, 2 months ago) by dpavlin
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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 dpavlin 2 /*
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 dpavlin 6 * $Id: dec_prom.c,v 1.58 2005/05/15 01:55:49 debug Exp $
29 dpavlin 2 *
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 dpavlin 6 int disk_id = diskimage_bootdev(cpu->machine, NULL);
137 dpavlin 2 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 dpavlin 6 res = diskimage_access(cpu->machine, disk_id,
149     DISKIMAGE_SCSI, 0, current_file_offset, tmp_buf,
150 dpavlin 2 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 dpavlin 6 int disk_id = diskimage_bootdev(cpu->machine, NULL);
473 dpavlin 2 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 dpavlin 6 res = diskimage_access(cpu->machine, disk_id,
485     DISKIMAGE_SCSI, 0,
486 dpavlin 2 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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