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root/cebix/BasiliskII/src/emul_op.cpp
Revision: 1.2
Committed: 1999-10-05T14:59:43Z (25 years, 2 months ago) by cebix
Branch: MAIN
CVS Tags: release-0_7-2
Changes since 1.1: +1 -2 lines
Log Message:
- fixed some compiler warnings
- video_x.cpp: now checks whether the X server has the XFree86DGA extension

File Contents

# User Rev Content
1 cebix 1.1 /*
2     * emul_op.cpp - 68k opcodes for ROM patches
3     *
4     * Basilisk II (C) 1997-1999 Christian Bauer
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 <string.h>
22     #include <stdio.h>
23    
24     #include "sysdeps.h"
25     #include "cpu_emulation.h"
26     #include "main.h"
27     #include "macos_util.h"
28     #include "rom_patches.h"
29     #include "rsrc_patches.h"
30     #include "xpram.h"
31     #include "adb.h"
32     #include "timer.h"
33     #include "clip.h"
34     #include "serial.h"
35     #include "sony.h"
36     #include "disk.h"
37     #include "cdrom.h"
38     #include "scsi.h"
39     #include "video.h"
40     #include "audio.h"
41     #include "ether.h"
42     #include "emul_op.h"
43    
44     #define DEBUG 0
45     #include "debug.h"
46    
47    
48     /*
49     * Execute EMUL_OP opcode (called by 68k emulator or Illegal Instruction trap handler)
50     */
51    
52     void EmulOp(uint16 opcode, M68kRegisters *r)
53     {
54     D(bug("EmulOp %04x\n", opcode));
55     switch (opcode) {
56     case M68K_EMUL_BREAK: { // Breakpoint
57     printf("*** Breakpoint\n");
58     printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
59     "d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
60     "a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
61     "a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
62     "sr %04x\n",
63     r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
64     r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
65     r->sr);
66     QuitEmulator();
67     break;
68     }
69    
70     case M68K_EMUL_OP_SHUTDOWN: // Quit emulator
71     QuitEmulator();
72     break;
73    
74     case M68K_EMUL_OP_RESET: { // MacOS reset
75     D(bug("*** RESET ***\n"));
76     TimerReset();
77     EtherReset();
78    
79     // Create BootGlobs at top of memory
80     memset((void *)(RAMBaseHost + RAMSize - 4096), 0, 4096);
81     uint32 boot_globs = RAMBaseMac + RAMSize - 0x1c;
82     WriteMacInt32(boot_globs + 0x00, RAMBaseMac); // First RAM bank
83     WriteMacInt32(boot_globs + 0x04, RAMSize);
84     WriteMacInt32(boot_globs + 0x08, 0xffffffff); // End of bank table
85     WriteMacInt32(boot_globs + 0x0c, 0);
86    
87     // Setup registers for boot routine
88     r->d[0] = ReadMacInt32(ROMBaseMac + UniversalInfo + 0x18); // AddrMapFlags
89     r->d[1] = ReadMacInt32(ROMBaseMac + UniversalInfo + 0x1c); // UnivROMFlags
90     r->d[2] = ReadMacInt32(ROMBaseMac + UniversalInfo + 0x10); // HWCfgFlags/IDs
91     if (FPUType)
92     r->d[2] |= 0x10000000; // Set FPU flag if FPU present
93     else
94     r->d[2] &= 0xefffffff; // Clear FPU flag if no FPU present
95     r->a[0] = ROMBaseMac + UniversalInfo + ReadMacInt32(ROMBaseMac + UniversalInfo);// AddrMap
96     r->a[1] = ROMBaseMac + UniversalInfo; // UniversalInfo
97     r->a[6] = boot_globs; // BootGlobs
98     r->a[7] = RAMBaseMac + 0x10000; // Boot stack
99     break;
100     }
101    
102     case M68K_EMUL_OP_CLKNOMEM: { // Clock/PRAM operations
103     bool is_read = r->d[1] & 0x80;
104     if ((r->d[1] & 0x78) == 0x38) {
105     // XPRAM
106     uint8 reg = (r->d[1] << 5) & 0xe0 | (r->d[1] >> 10) & 0x1f;
107     if (is_read) {
108     r->d[2] = XPRAM[reg];
109     bool localtalk = !(XPRAM[0xe0] || XPRAM[0xe1]); // LocalTalk enabled?
110     switch (reg) {
111     case 0x08:
112     if (ROMVersion != ROM_VERSION_32)
113     r->d[2] &= 0xf8;
114     break;
115     case 0x8a:
116     r->d[2] |= 0x05; // 32bit mode is always enabled
117     break;
118     case 0xe0: // Disable LocalTalk (use EtherTalk instead)
119     if (localtalk)
120     r->d[2] = 0x00;
121     break;
122     case 0xe1:
123     if (localtalk)
124     r->d[2] = 0xf1;
125     break;
126     case 0xe2:
127     if (localtalk)
128     r->d[2] = 0x00;
129     break;
130     case 0xe3:
131     if (localtalk)
132     r->d[2] = 0x0a;
133     break;
134     }
135     D(bug("Read XPRAM %02x->%02lx\n", reg, r->d[2]));
136     } else {
137     D(bug("Write XPRAM %02x<-%02lx\n", reg, r->d[2] & 0xff));
138     if (reg == 0x8a && !TwentyFourBitAddressing)
139     r->d[2] |= 0x05; // 32bit mode is always enabled if possible
140     XPRAM[reg] = r->d[2];
141     }
142     } else {
143     // PRAM, RTC and other clock registers
144     uint8 reg = (r->d[1] >> 2) & 0x1f;
145     if (reg >= 0x10 || (reg >= 0x08 && reg < 0x0c)) {
146     if (is_read) {
147     r->d[2] = XPRAM[reg];
148     D(bug("Read XPRAM %02x->%02x\n", reg, XPRAM[reg]));
149     } else {
150     D(bug("Write PRAM %02x<-%02lx\n", reg, r->d[2]));
151     XPRAM[reg] = r->d[2];
152     }
153     } else if (reg < 0x08 && is_read) {
154     uint32 t = TimerDateTime();
155 cebix 1.2 uint8 b = t;
156 cebix 1.1 switch (reg & 3) {
157     case 1: b = t >> 8; break;
158     case 2: b = t >> 16; break;
159     case 3: b = t >> 24; break;
160     }
161     r->d[2] = b;
162     } else
163     D(bug("RTC %s op %d, d1 %08lx d2 %08lx\n", is_read ? "read" : "write", reg, r->d[1], r->d[2]));
164     }
165     r->d[0] = 0;
166     r->d[1] = r->d[2];
167     break;
168     }
169    
170     case M68K_EMUL_OP_READ_XPRAM: // Read from XPRAM (ROM10/11)
171     D(bug("Read XPRAM %02lx\n", r->d[1]));
172     r->d[1] = XPRAM[r->d[1] & 0xff];
173     break;
174    
175     case M68K_EMUL_OP_READ_XPRAM2: // Read from XPRAM (ROM15)
176     D(bug("Read XPRAM %02lx\n", r->d[0]));
177     r->d[0] = XPRAM[r->d[0] & 0xff];
178     break;
179    
180     case M68K_EMUL_OP_PATCH_BOOT_GLOBS: // Patch BootGlobs at startup
181     D(bug("Patch BootGlobs\n"));
182     WriteMacInt32(r->a[4] - 20, RAMBaseMac + RAMSize); // MemTop
183     WriteMacInt8(r->a[4] - 26, 0); // No MMU
184     WriteMacInt8(r->a[4] - 25, ReadMacInt8(r->a[4] - 25) | 1); // No MMU
185     r->a[6] = RAMBaseMac + RAMSize;
186     break;
187    
188     case M68K_EMUL_OP_FIX_BOOTSTACK: // Set boot stack to 3/4 of RAM (7.5)
189     D(bug("Fix boot stack\n"));
190     r->a[1] = RAMBaseMac + RAMSize * 3 / 4;
191     break;
192    
193     case M68K_EMUL_OP_FIX_MEMSIZE: { // Set correct logical and physical memory size
194     D(bug("Fix MemSize\n"));
195     uint32 diff = ReadMacInt32(0x1ef8) - ReadMacInt32(0x1ef4); // Difference between logical and physical size
196     WriteMacInt32(0x1ef8, RAMSize); // Physical RAM size
197     WriteMacInt32(0x1ef4, RAMSize - diff); // Logical RAM size
198     break;
199     }
200    
201     case M68K_EMUL_OP_ADBOP: // ADBOp() replacement
202     ADBOp(r->d[0], Mac2HostAddr(ReadMacInt32(r->a[0])));
203     break;
204    
205     case M68K_EMUL_OP_INSTIME: // InsTime() replacement
206     r->d[0] = InsTime(r->a[0], r->d[1]);
207     break;
208    
209     case M68K_EMUL_OP_RMVTIME: // RmvTime() replacement
210     r->d[0] = RmvTime(r->a[0]);
211     break;
212    
213     case M68K_EMUL_OP_PRIMETIME: // PrimeTime() replacement
214     r->d[0] = PrimeTime(r->a[0], r->d[0]);
215     break;
216    
217     case M68K_EMUL_OP_MICROSECONDS: // Microseconds() replacement
218     Microseconds(r->a[0], r->d[0]);
219     break;
220    
221     case M68K_EMUL_OP_INSTALL_DRIVERS: {// Patch to install our own drivers during startup
222     // Install drivers
223     D(bug("InstallDrivers\n"));
224     InstallDrivers(r->a[0]);
225    
226     // Install PutScrap() patch
227     M68kRegisters r;
228     r.d[0] = 0xa9fe;
229     r.a[0] = PutScrapPatch;
230     Execute68kTrap(0xa647, &r); // SetToolTrap()
231    
232     // Setup fake ASC registers
233     if (ROMVersion == ROM_VERSION_32) {
234     r.d[0] = 0x1000;
235     Execute68kTrap(0xa71e, &r); // NewPtrSysClear()
236     uint32 asc_regs = r.a[0];
237     D(bug("ASC registers at %08lx\n", asc_regs));
238     WriteMacInt8(asc_regs + 0x800, 0x0f); // Set ASC version number
239     WriteMacInt32(0xcc0, asc_regs); // Set ASCBase
240     }
241     break;
242     }
243    
244     case M68K_EMUL_OP_SERD: // Install serial drivers
245     D(bug("InstallSERD\n"));
246     InstallSERD();
247     break;
248    
249     case M68K_EMUL_OP_SONY_OPEN: // Floppy driver functions
250     r->d[0] = SonyOpen(r->a[0], r->a[1]);
251     break;
252    
253     case M68K_EMUL_OP_SONY_PRIME:
254     r->d[0] = SonyPrime(r->a[0], r->a[1]);
255     break;
256    
257     case M68K_EMUL_OP_SONY_CONTROL:
258     r->d[0] = SonyControl(r->a[0], r->a[1]);
259     break;
260    
261     case M68K_EMUL_OP_SONY_STATUS:
262     r->d[0] = SonyStatus(r->a[0], r->a[1]);
263     break;
264    
265     case M68K_EMUL_OP_DISK_OPEN: // Disk driver functions
266     r->d[0] = DiskOpen(r->a[0], r->a[1]);
267     break;
268    
269     case M68K_EMUL_OP_DISK_PRIME:
270     r->d[0] = DiskPrime(r->a[0], r->a[1]);
271     break;
272    
273     case M68K_EMUL_OP_DISK_CONTROL:
274     r->d[0] = DiskControl(r->a[0], r->a[1]);
275     break;
276    
277     case M68K_EMUL_OP_DISK_STATUS:
278     r->d[0] = DiskStatus(r->a[0], r->a[1]);
279     break;
280    
281     case M68K_EMUL_OP_CDROM_OPEN: // CD-ROM driver functions
282     r->d[0] = CDROMOpen(r->a[0], r->a[1]);
283     break;
284    
285     case M68K_EMUL_OP_CDROM_PRIME:
286     r->d[0] = CDROMPrime(r->a[0], r->a[1]);
287     break;
288    
289     case M68K_EMUL_OP_CDROM_CONTROL:
290     r->d[0] = CDROMControl(r->a[0], r->a[1]);
291     break;
292    
293     case M68K_EMUL_OP_CDROM_STATUS:
294     r->d[0] = CDROMStatus(r->a[0], r->a[1]);
295     break;
296    
297     case M68K_EMUL_OP_VIDEO_OPEN: // Video driver functions
298     r->d[0] = VideoOpen(r->a[0], r->a[1]);
299     break;
300    
301     case M68K_EMUL_OP_VIDEO_CONTROL:
302     r->d[0] = VideoControl(r->a[0], r->a[1]);
303     break;
304    
305     case M68K_EMUL_OP_VIDEO_STATUS:
306     r->d[0] = VideoStatus(r->a[0], r->a[1]);
307     break;
308    
309     case M68K_EMUL_OP_SERIAL_OPEN: // Serial driver functions
310     r->d[0] = SerialOpen(r->a[0], r->a[1], r->d[0]);
311     break;
312    
313     case M68K_EMUL_OP_SERIAL_PRIME:
314     r->d[0] = SerialPrime(r->a[0], r->a[1], r->d[0]);
315     break;
316    
317     case M68K_EMUL_OP_SERIAL_CONTROL:
318     r->d[0] = SerialControl(r->a[0], r->a[1], r->d[0]);
319     break;
320    
321     case M68K_EMUL_OP_SERIAL_STATUS:
322     r->d[0] = SerialStatus(r->a[0], r->a[1], r->d[0]);
323     break;
324    
325     case M68K_EMUL_OP_SERIAL_CLOSE:
326     r->d[0] = SerialClose(r->a[0], r->a[1], r->d[0]);
327     break;
328    
329     case M68K_EMUL_OP_ETHER_OPEN: // Ethernet driver functions
330     r->d[0] = EtherOpen(r->a[0], r->a[1]);
331     break;
332    
333     case M68K_EMUL_OP_ETHER_CONTROL:
334     r->d[0] = EtherControl(r->a[0], r->a[1]);
335     break;
336    
337     case M68K_EMUL_OP_ETHER_READ_PACKET:
338     EtherReadPacket((uint8 **)&r->a[0], r->a[3], r->d[3], r->d[1]);
339     break;
340    
341     case M68K_EMUL_OP_SCSI_DISPATCH: { // SCSIDispatch() replacement
342     uint32 ret = ReadMacInt32(r->a[7]); // Get return address
343     uint16 sel = ReadMacInt16(r->a[7] + 4); // Get selector
344     r->a[7] += 6;
345     int stack = 0;
346     switch (sel) {
347     case 0: // SCSIReset
348     WriteMacInt16(r->a[7], SCSIReset());
349     stack = 0;
350     break;
351     case 1: // SCSIGet
352     WriteMacInt16(r->a[7], SCSIGet());
353     stack = 0;
354     break;
355     case 2: // SCSISelect
356     case 11: // SCSISelAtn
357     WriteMacInt16(r->a[7] + 2, SCSISelect(ReadMacInt16(r->a[7]) & 0xff));
358     stack = 2;
359     break;
360     case 3: // SCSICmd
361     WriteMacInt16(r->a[7] + 6, SCSICmd(ReadMacInt16(r->a[7]), Mac2HostAddr(ReadMacInt32(r->a[7] + 2))));
362     stack = 6;
363     break;
364     case 4: // SCSIComplete
365     WriteMacInt16(r->a[7] + 12, SCSIComplete(ReadMacInt32(r->a[7]), ReadMacInt32(r->a[7] + 4), ReadMacInt32(r->a[7] + 8)));
366     stack = 12;
367     break;
368     case 5: // SCSIRead
369     case 8: // SCSIRBlind
370     WriteMacInt16(r->a[7] + 4, SCSIRead(ReadMacInt32(r->a[7])));
371     stack = 4;
372     break;
373     case 6: // SCSIWrite
374     case 9: // SCSIWBlind
375     WriteMacInt16(r->a[7] + 4, SCSIWrite(ReadMacInt32(r->a[7])));
376     stack = 4;
377     break;
378     case 10: // SCSIStat
379     WriteMacInt16(r->a[7], SCSIStat());
380     stack = 0;
381     break;
382     case 12: // SCSIMsgIn
383     WriteMacInt16(r->a[7] + 4, 0);
384     stack = 4;
385     break;
386     case 13: // SCSIMsgOut
387     WriteMacInt16(r->a[7] + 2, 0);
388     stack = 2;
389     break;
390     case 14: // SCSIMgrBusy
391     WriteMacInt16(r->a[7], SCSIMgrBusy());
392     stack = 0;
393     break;
394     default:
395     printf("FATAL: SCSIDispatch(%d): illegal selector\n", sel);
396     QuitEmulator();
397     break;
398     }
399     r->a[0] = ret; // "rtd" emulation, a0 = return address, a1 = new stack pointer
400     r->a[1] = r->a[7] + stack;
401     break;
402     }
403    
404     case M68K_EMUL_OP_MEMORY_DISPATCH: { // MemoryDispatch() replacement routine
405     int16 sel = r->d[0];
406     D(bug("MemoryDispatch(%d)\n", sel));
407     switch (sel) {
408     case -6: // GetLogicalRAMSize
409     r->d[0] = RAMSize;
410     break;
411     case -3:
412     r->d[0] = 0x1000;
413     break;
414     case 0: // HoldMemory
415     case 1: // UnholdMemory
416     case 2: // LockMemory
417     case 3: // UnlockMemory
418     case 4: // LockMemoryContiguous
419     case 6: // ProtectMemory
420     case 7: // UnprotectMemory
421     r->d[0] = 0;
422     break;
423     default:
424     printf("FATAL: MemoryDispatch(%d): illegal selector\n", sel);
425     r->d[0] = (uint32)-502;
426     break;
427     }
428     break;
429     }
430    
431     case M68K_EMUL_OP_IRQ: // Level 1 interrupt
432     r->d[0] = 0;
433     if (InterruptFlags & INTFLAG_60HZ) {
434     ClearInterruptFlag(INTFLAG_60HZ);
435     if (HasMacStarted()) {
436    
437     // Mac has started, execute video, ADB and Time Manager interrupt functions
438     ADBInterrupt();
439     TimerInterrupt();
440     VideoInterrupt();
441    
442     // Call DoVBLTask(0)
443     if (ROMVersion == ROM_VERSION_32) {
444     M68kRegisters r2;
445     r2.d[0] = 0;
446     Execute68kTrap(0xa072, &r2);
447     }
448    
449     r->d[0] = 1; // Flag: 68k interrupt routine executes VBLTasks etc.
450     }
451     }
452     if (InterruptFlags & INTFLAG_SERIAL) {
453     ClearInterruptFlag(INTFLAG_SERIAL);
454     SerialInterrupt();
455     }
456     if (InterruptFlags & INTFLAG_ETHER) {
457     ClearInterruptFlag(INTFLAG_ETHER);
458     EtherInterrupt();
459     }
460     if (InterruptFlags & INTFLAG_AUDIO) {
461     ClearInterruptFlag(INTFLAG_AUDIO);
462     AudioInterrupt();
463     }
464     break;
465    
466     case M68K_EMUL_OP_PUT_SCRAP: { // PutScrap() patch
467     void *scrap = Mac2HostAddr(ReadMacInt32(r->a[7] + 4));
468     uint32 type = ReadMacInt32(r->a[7] + 8);
469     int32 length = ReadMacInt32(r->a[7] + 12);
470     PutScrap(type, scrap, length);
471     break;
472     }
473    
474     case M68K_EMUL_OP_CHECKLOAD: { // vCheckLoad() patch (resource loader)
475     uint32 type = r->d[1];
476     int16 id = ReadMacInt16(r->a[2]);
477     if (r->a[0] == 0)
478     break;
479     uint32 adr = ReadMacInt32(r->a[0]);
480     if (adr == 0)
481     break;
482     uint8 *p = Mac2HostAddr(adr);
483     uint32 size = ReadMacInt32(adr - 8) & 0xffffff;
484     CheckLoad(type, id, p, size);
485     break;
486     }
487    
488     case M68K_EMUL_OP_AUDIO: // Audio component dispatch function
489     r->d[0] = AudioDispatch(r->a[3], r->a[4]);
490     break;
491    
492     default:
493     printf("FATAL: EMUL_OP called with bogus opcode %08x\n", opcode);
494     printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
495     "d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
496     "a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
497     "a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
498     "sr %04x\n",
499     r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
500     r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
501     r->sr);
502     QuitEmulator();
503     break;
504     }
505     }