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root/cebix/SheepShaver/src/emul_op.cpp
Revision: 1.1
Committed: 2002-02-04T16:58:13Z (22 years, 9 months ago) by cebix
Branch: MAIN
Branch point for: cebix
Log Message:
Initial revision

File Contents

# Content
1 /*
2 * emul_op.cpp - 68k opcodes for ROM patches
3 *
4 * SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <stdio.h>
22
23 #include "sysdeps.h"
24 #include "main.h"
25 #include "version.h"
26 #include "prefs.h"
27 #include "cpu_emulation.h"
28 #include "xlowmem.h"
29 #include "xpram.h"
30 #include "timer.h"
31 #include "adb.h"
32 #include "sony.h"
33 #include "disk.h"
34 #include "cdrom.h"
35 #include "scsi.h"
36 #include "video.h"
37 #include "audio.h"
38 #include "ether.h"
39 #include "serial.h"
40 #include "clip.h"
41 #include "extfs.h"
42 #include "macos_util.h"
43 #include "rom_patches.h"
44 #include "rsrc_patches.h"
45 #include "name_registry.h"
46 #include "user_strings.h"
47 #include "emul_op.h"
48
49 #define DEBUG 0
50 #include "debug.h"
51
52
53 #if __BEOS__
54 #define PRECISE_TIMING 1
55 #else
56 #define PRECISE_TIMING 0
57 #endif
58
59
60 // TVector of MakeExecutable
61 static uint32 *MakeExecutableTvec;
62
63
64 /*
65 * Execute EMUL_OP opcode (called by 68k emulator)
66 */
67
68 void EmulOp(M68kRegisters *r, uint32 pc, int selector)
69 {
70
71 D(bug("EmulOp %04x at %08x\n", selector, pc));
72 switch (selector) {
73 case OP_BREAK: // Breakpoint
74 printf("*** Breakpoint\n");
75 Dump68kRegs(r);
76 break;
77
78 case OP_XPRAM1: { // Read/write from/to XPRam
79 uint32 len = r->d[3];
80 uint8 *adr = Mac2HostAddr(r->a[3]);
81 D(bug("XPRAMReadWrite d3: %08lx, a3: %p\n", len, adr));
82 int ofs = len & 0xffff;
83 len >>= 16;
84 if (len & 0x8000) {
85 len &= 0x7fff;
86 for (uint32 i=0; i<len; i++)
87 XPRAM[((ofs + i) & 0xff) + 0x1300] = *adr++;
88 } else {
89 for (uint32 i=0; i<len; i++)
90 *adr++ = XPRAM[((ofs + i) & 0xff) + 0x1300];
91 }
92 break;
93 }
94
95 case OP_XPRAM2: // Read from XPRam
96 r->d[1] = XPRAM[(r->d[1] & 0xff) + 0x1300];
97 break;
98
99 case OP_XPRAM3: // Write to XPRam
100 XPRAM[(r->d[1] & 0xff) + 0x1300] = r->d[2];
101 break;
102
103 case OP_NVRAM1: { // Read from NVRAM
104 int ofs = r->d[0];
105 r->d[0] = XPRAM[ofs & 0x1fff];
106 bool localtalk = !(XPRAM[0x13e0] || XPRAM[0x13e1]); // LocalTalk enabled?
107 switch (ofs) {
108 case 0x13e0: // Disable LocalTalk (use EtherTalk instead)
109 if (localtalk)
110 r->d[0] = 0x00;
111 break;
112 case 0x13e1:
113 if (localtalk)
114 r->d[0] = 0x01;
115 break;
116 case 0x13e2:
117 if (localtalk)
118 r->d[0] = 0x00;
119 break;
120 case 0x13e3:
121 if (localtalk)
122 r->d[0] = 0x0a;
123 break;
124 }
125 break;
126 }
127
128 case OP_NVRAM2: // Write to NVRAM
129 XPRAM[r->d[0] & 0x1fff] = r->d[1];
130 break;
131
132 case OP_NVRAM3: // Read/write from/to NVRAM
133 if (r->d[3]) {
134 r->d[0] = XPRAM[(r->d[4] + 0x1300) & 0x1fff];
135 } else {
136 XPRAM[(r->d[4] + 0x1300) & 0x1fff] = r->d[5];
137 r->d[0] = 0;
138 }
139 break;
140
141 case OP_FIX_MEMTOP: // Fixes MemTop in BootGlobs during startup
142 D(bug("Fix MemTop\n"));
143 WriteMacInt32(BootGlobsAddr - 20, RAMBase + RAMSize); // MemTop
144 r->a[6] = RAMBase + RAMSize;
145 break;
146
147 case OP_FIX_MEMSIZE: { // Fixes physical/logical RAM size during startup
148 D(bug("Fix MemSize\n"));
149 uint32 diff = ReadMacInt32(0x1ef8) - ReadMacInt32(0x1ef4);
150 WriteMacInt32(0x1ef8, RAMSize); // Physical RAM size
151 WriteMacInt32(0x1ef4, RAMSize - diff); // Logical RAM size
152 break;
153 }
154
155 case OP_FIX_BOOTSTACK: // Fixes boot stack pointer in boot 3 resource
156 D(bug("Fix BootStack\n"));
157 r->a[1] = r->a[7] = RAMBase + RAMSize * 3 / 4;
158 break;
159
160 case OP_SONY_OPEN: // Floppy driver functions
161 r->d[0] = SonyOpen(r->a[0], r->a[1]);
162 break;
163 case OP_SONY_PRIME:
164 r->d[0] = SonyPrime(r->a[0], r->a[1]);
165 break;
166 case OP_SONY_CONTROL:
167 r->d[0] = SonyControl(r->a[0], r->a[1]);
168 break;
169 case OP_SONY_STATUS:
170 r->d[0] = SonyStatus(r->a[0], r->a[1]);
171 break;
172
173 case OP_DISK_OPEN: // Disk driver functions
174 r->d[0] = DiskOpen(r->a[0], r->a[1]);
175 break;
176 case OP_DISK_PRIME:
177 r->d[0] = DiskPrime(r->a[0], r->a[1]);
178 break;
179 case OP_DISK_CONTROL:
180 r->d[0] = DiskControl(r->a[0], r->a[1]);
181 break;
182 case OP_DISK_STATUS:
183 r->d[0] = DiskStatus(r->a[0], r->a[1]);
184 break;
185
186 case OP_CDROM_OPEN: // CD-ROM driver functions
187 r->d[0] = CDROMOpen(r->a[0], r->a[1]);
188 break;
189 case OP_CDROM_PRIME:
190 r->d[0] = CDROMPrime(r->a[0], r->a[1]);
191 break;
192 case OP_CDROM_CONTROL:
193 r->d[0] = CDROMControl(r->a[0], r->a[1]);
194 break;
195 case OP_CDROM_STATUS:
196 r->d[0] = CDROMStatus(r->a[0], r->a[1]);
197 break;
198
199 case OP_AUDIO_DISPATCH: // Audio component functions
200 r->d[0] = AudioDispatch(r->a[3], r->a[4]);
201 break;
202
203 case OP_SOUNDIN_OPEN: // Sound input driver functions
204 r->d[0] = SoundInOpen(r->a[0], r->a[1]);
205 break;
206 case OP_SOUNDIN_PRIME:
207 r->d[0] = SoundInPrime(r->a[0], r->a[1]);
208 break;
209 case OP_SOUNDIN_CONTROL:
210 r->d[0] = SoundInControl(r->a[0], r->a[1]);
211 break;
212 case OP_SOUNDIN_STATUS:
213 r->d[0] = SoundInStatus(r->a[0], r->a[1]);
214 break;
215 case OP_SOUNDIN_CLOSE:
216 r->d[0] = SoundInClose(r->a[0], r->a[1]);
217 break;
218
219 case OP_ADBOP: // ADBOp() replacement
220 ADBOp(r->d[0], Mac2HostAddr(ReadMacInt32(r->a[0])));
221 break;
222
223 case OP_INSTIME: // InsTime() replacement
224 r->d[0] = InsTime(r->a[0], r->d[1]);
225 break;
226 case OP_RMVTIME: // RmvTime() replacement
227 r->d[0] = RmvTime(r->a[0]);
228 break;
229 case OP_PRIMETIME: // PrimeTime() replacement
230 r->d[0] = PrimeTime(r->a[0], r->d[0]);
231 break;
232
233 case OP_MICROSECONDS: // Microseconds() replacement
234 Microseconds(r->a[0], r->d[0]);
235 break;
236
237 case OP_PUT_SCRAP: // PutScrap() patch
238 PutScrap(ReadMacInt32(r->a[7] + 8), Mac2HostAddr(ReadMacInt32(r->a[7] + 4)), ReadMacInt32(r->a[7] + 12));
239 break;
240
241 case OP_GET_SCRAP: // GetScrap() patch
242 GetScrap((void **)Mac2HostAddr(ReadMacInt32(r->a[7] + 4)), ReadMacInt32(r->a[7] + 8), ReadMacInt32(r->a[7] + 12));
243 break;
244
245 case OP_DEBUG_STR: // DebugStr() shows warning message
246 if (PrefsFindBool("nogui")) {
247 uint8 *pstr = Mac2HostAddr(ReadMacInt32(r->a[7] + 4));
248 char str[256];
249 int i;
250 for (i=0; i<pstr[0]; i++)
251 str[i] = pstr[i+1];
252 str[i] = 0;
253 WarningAlert(str);
254 }
255 break;
256
257 case OP_INSTALL_DRIVERS: { // Patch to install our own drivers during startup
258 // Install drivers
259 InstallDrivers();
260
261 #if !EMULATED_PPC
262 // Patch MakeExecutable()
263 MakeExecutableTvec = (uint32 *)FindLibSymbol("\023PrivateInterfaceLib", "\016MakeExecutable");
264 D(bug("MakeExecutable TVECT at %p\n", MakeExecutableTvec));
265 #ifdef __BEOS__
266 MakeExecutableTvec[0] = ((uint32 *)MakeExecutable)[0];
267 #else
268 MakeExecutableTvec[0] = (uint32)MakeExecutable;
269 #endif
270 MakeExecutableTvec[1] = (uint32)TOC;
271 #endif
272
273 // Patch DebugStr()
274 static const uint16 proc[] = {
275 M68K_EMUL_OP_DEBUG_STR,
276 0x4e74, // rtd #4
277 0x0004
278 };
279 WriteMacInt32(0x1dfc, (uint32)proc);
280 break;
281 }
282
283 case OP_NAME_REGISTRY: // Patch Name Registry and initialize CallUniversalProc
284 r->d[0] = (uint32)-1;
285 PatchNameRegistry();
286 InitCallUniversalProc();
287 break;
288
289 case OP_RESET: // Early in MacOS reset
290 D(bug("*** RESET ***\n"));
291 TimerReset();
292 MacOSUtilReset();
293 AudioReset();
294 #if 0
295 printf("DR activated\n");
296 WriteMacInt32(KernelDataAddr + 0x17a0, 3); // Prepare for DR emulator activation
297 WriteMacInt32(KernelDataAddr + 0x17c0, DR_CACHE_BASE);
298 WriteMacInt32(KernelDataAddr + 0x17c4, DR_CACHE_SIZE);
299 WriteMacInt32(KernelDataAddr + 0x1b00, DR_CACHE_BASE + 0x10000);
300 memcpy((void *)(DR_CACHE_BASE + 0x10000), (void *)(ROM_BASE + 0x370000), 0x10000);
301 clear_caches((void *)(DR_CACHE_BASE + 0x10000), 0x10000, B_INVALIDATE_ICACHE | B_FLUSH_DCACHE);
302 #endif
303 break;
304
305 case OP_IRQ: // Level 1 interrupt
306 WriteMacInt16(ReadMacInt32(KernelDataAddr + 0x67c), 0); // Clear interrupt
307 r->d[0] = 0;
308 if (HasMacStarted()) {
309 if (InterruptFlags & INTFLAG_VIA) {
310 ClearInterruptFlag(INTFLAG_VIA);
311 #if !PRECISE_TIMING
312 TimerInterrupt();
313 #endif
314 ExecutePPC(VideoVBL);
315
316 static int tick_counter = 0;
317 if (++tick_counter >= 60) {
318 tick_counter = 0;
319 SonyInterrupt();
320 DiskInterrupt();
321 CDROMInterrupt();
322 }
323
324 r->d[0] = 1; // Flag: 68k interrupt routine executes VBLTasks etc.
325 }
326 if (InterruptFlags & INTFLAG_SERIAL) {
327 ClearInterruptFlag(INTFLAG_SERIAL);
328 SerialInterrupt();
329 }
330 if (InterruptFlags & INTFLAG_ETHER) {
331 ClearInterruptFlag(INTFLAG_ETHER);
332 ExecutePPC(EtherIRQ);
333 }
334 if (InterruptFlags & INTFLAG_TIMER) {
335 ClearInterruptFlag(INTFLAG_TIMER);
336 TimerInterrupt();
337 }
338 if (InterruptFlags & INTFLAG_AUDIO) {
339 ClearInterruptFlag(INTFLAG_AUDIO);
340 AudioInterrupt();
341 }
342 if (InterruptFlags & INTFLAG_ADB) {
343 ClearInterruptFlag(INTFLAG_ADB);
344 ADBInterrupt();
345 }
346 } else
347 r->d[0] = 1;
348 break;
349
350 case OP_SCSI_DISPATCH: { // SCSIDispatch() replacement
351 uint32 ret = ReadMacInt32(r->a[7]);
352 uint16 sel = ReadMacInt16(r->a[7] + 4);
353 r->a[7] += 6;
354 // D(bug("SCSIDispatch(%d)\n", sel));
355 int stack;
356 switch (sel) {
357 case 0: // SCSIReset
358 WriteMacInt16(r->a[7], SCSIReset());
359 stack = 0;
360 break;
361 case 1: // SCSIGet
362 WriteMacInt16(r->a[7], SCSIGet());
363 stack = 0;
364 break;
365 case 2: // SCSISelect
366 case 11: // SCSISelAtn
367 WriteMacInt16(r->a[7] + 2, SCSISelect(ReadMacInt8(r->a[7] + 1)));
368 stack = 2;
369 break;
370 case 3: // SCSICmd
371 WriteMacInt16(r->a[7] + 6, SCSICmd(ReadMacInt16(r->a[7]), Mac2HostAddr(ReadMacInt32(r->a[7] + 2))));
372 stack = 6;
373 break;
374 case 4: // SCSIComplete
375 WriteMacInt16(r->a[7] + 12, SCSIComplete(ReadMacInt32(r->a[7]), ReadMacInt32(r->a[7] + 4), ReadMacInt32(r->a[7] + 8)));
376 stack = 12;
377 break;
378 case 5: // SCSIRead
379 case 8: // SCSIRBlind
380 WriteMacInt16(r->a[7] + 4, SCSIRead(ReadMacInt32(r->a[7])));
381 stack = 4;
382 break;
383 case 6: // SCSIWrite
384 case 9: // SCSIWBlind
385 WriteMacInt16(r->a[7] + 4, SCSIWrite(ReadMacInt32(r->a[7])));
386 stack = 4;
387 break;
388 case 10: // SCSIStat
389 WriteMacInt16(r->a[7], SCSIStat());
390 stack = 0;
391 break;
392 case 12: // SCSIMsgIn
393 WriteMacInt16(r->a[7] + 4, 0);
394 stack = 4;
395 break;
396 case 13: // SCSIMsgOut
397 WriteMacInt16(r->a[7] + 2, 0);
398 stack = 2;
399 break;
400 case 14: // SCSIMgrBusy
401 WriteMacInt16(r->a[7], SCSIMgrBusy());
402 stack = 0;
403 break;
404 default:
405 printf("FATAL: SCSIDispatch: illegal selector\n");
406 stack = 0;
407 //!! SysError(12)
408 }
409 r->a[0] = ret;
410 r->a[7] += stack;
411 break;
412 }
413
414 case OP_SCSI_ATOMIC: // SCSIAtomic() replacement
415 D(bug("SCSIAtomic\n"));
416 r->d[0] = (uint32)-7887;
417 break;
418
419 case OP_NTRB_17_PATCH:
420 r->a[2] = ReadMacInt32(r->a[7]);
421 r->a[7] += 4;
422 if (ReadMacInt16(r->a[2] + 6) == 17)
423 PatchNativeResourceManager();
424 break;
425
426 case OP_NTRB_17_PATCH2:
427 r->a[7] += 8;
428 PatchNativeResourceManager();
429 break;
430
431 case OP_NTRB_17_PATCH3:
432 r->a[2] = ReadMacInt32(r->a[7]);
433 r->a[7] += 4;
434 D(bug("%d %d\n", ReadMacInt16(r->a[2]), ReadMacInt16(r->a[2] + 6)));
435 if (ReadMacInt16(r->a[2]) == 11 && ReadMacInt16(r->a[2] + 6) == 17)
436 PatchNativeResourceManager();
437 break;
438
439 case OP_CHECKLOAD: { // vCheckLoad() patch
440 uint32 type = ReadMacInt32(r->a[7]);
441 r->a[7] += 4;
442 int16 id = ReadMacInt16(r->a[2]);
443 if (r->a[0] == 0)
444 break;
445 uint32 adr = ReadMacInt32(r->a[0]);
446 if (adr == 0)
447 break;
448 uint16 *p = (uint16 *)Mac2HostAddr(adr);
449 uint32 size = ReadMacInt32(adr - 8) & 0xffffff;
450 CheckLoad(type, id, p, size);
451 break;
452 }
453
454 case OP_EXTFS_COMM: // External file system routines
455 WriteMacInt16(r->a[7] + 14, ExtFSComm(ReadMacInt16(r->a[7] + 12), ReadMacInt32(r->a[7] + 8), ReadMacInt32(r->a[7] + 4)));
456 break;
457
458 case OP_EXTFS_HFS:
459 WriteMacInt16(r->a[7] + 20, ExtFSHFS(ReadMacInt32(r->a[7] + 16), ReadMacInt16(r->a[7] + 14), ReadMacInt32(r->a[7] + 10), ReadMacInt32(r->a[7] + 6), ReadMacInt16(r->a[7] + 4)));
460 break;
461
462 case OP_IDLE_TIME:
463 #if __BEOS__
464 // Sleep if no events pending
465 if (ReadMacInt32(0x14c) == 0) {
466 sleep(16667);
467 }
468 #endif
469 r->a[0] = ReadMacInt32(0x2b6);
470 break;
471
472 default:
473 printf("FATAL: EMUL_OP called with bogus selector %08x\n", selector);
474 QuitEmulator();
475 break;
476 }
477 }