/[gxemul]/trunk/src/devices/dev_dreamcast_maple.c
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Contents of /trunk/src/devices/dev_dreamcast_maple.c

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Revision 42 - (show annotations)
Mon Oct 8 16:22:32 2007 UTC (13 years, 3 months ago) by dpavlin
File MIME type: text/plain
File size: 18455 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1613 2007/06/15 20:11:26 debug Exp $
20070501	Continuing a little on m88k disassembly (control registers,
		more instructions).
		Adding a dummy mvme88k machine mode.
20070502	Re-adding MIPS load/store alignment exceptions.
20070503	Implementing more of the M88K disassembly code.
20070504	Adding disassembly of some more M88K load/store instructions.
		Implementing some relatively simple M88K instructions (br.n,
		xor[.u] imm, and[.u] imm).
20070505	Implementing M88K three-register and, or, xor, and jmp[.n],
		bsr[.n] including function call trace stuff.
		Applying a patch from Bruce M. Simpson which implements the
		SYSCON_BOARD_CPU_CLOCK_FREQ_ID object of the syscon call in
		the yamon PROM emulation.
20070506	Implementing M88K bb0[.n] and bb1[.n], and skeletons for
		ldcr and stcr (although no control regs are implemented yet).
20070509	Found and fixed the bug which caused Linux for QEMU_MIPS to
		stop working in 0.4.5.1: It was a faulty change to the MIPS
		'sc' and 'scd' instructions I made while going through gcc -W
		warnings on 20070428.
20070510	Updating the Linux/QEMU_MIPS section in guestoses.html to
		use mips-test-0.2.tar.gz instead of 0.1.
		A big thank you to Miod Vallat for sending me M88K manuals.
		Implementing more M88K instructions (addu, subu, div[u], mulu,
		ext[u], clr, set, cmp).
20070511	Fixing bugs in the M88K "and" and "and.u" instructions (found
		by comparing against the manual).
		Implementing more M88K instructions (mask[.u], mak, bcnd (auto-
		generated)) and some more control register details.
		Cleanup: Removing the experimental AVR emulation mode and
		corresponding devices; AVR emulation wasn't really meaningful.
		Implementing autogeneration of most M88K loads/stores. The
		rectangle drawing demo (with -O0) for M88K runs :-)
		Beginning on M88K exception handling.
		More M88K instructions: tb0, tb1, rte, sub, jsr[.n].
		Adding some skeleton MVME PROM ("BUG") emulation.
20070512	Fixing a bug in the M88K cmp instruction.
		Adding the M88K lda (scaled register) instruction.
		Fixing bugs in 64-bit (32-bit pairs) M88K loads/stores.
		Removing the unused tick_hz stuff from the machine struct.
		Implementing the M88K xmem instruction. OpenBSD/mvme88k gets
		far enough to display the Copyright banner :-)
		Implementing subu.co (guess), addu.co, addu.ci, ff0, and ff1.
		Adding a dev_mvme187, for MVME187-specific devices/registers.
		OpenBSD/mvme88k prints more boot messages. :)
20070515	Continuing on MVME187 emulation (adding more devices, beginning
		on the CMMUs, etc).
		Adding the M88K and.c, xor.c, and or.c instructions, and making
		sure that mul, div, etc cause exceptions if executed when SFD1
		is disabled.
20070517	Continuing on M88K and MVME187 emulation in general; moving
		the CMMU registers to the CPU struct, separating dev_pcc2 from
		dev_mvme187, and beginning on memory_m88k.c (BATC and PATC).
		Fixing a bug in 64-bit (32-bit pairs) M88K fast stores.
		Implementing the clock part of dev_mk48txx.
		Implementing the M88K fstcr and xcr instructions.
		Implementing m88k_cpu_tlbdump().
		Beginning on the implementation of a separate address space
		for M88K .usr loads/stores.
20070520	Removing the non-working (skeleton) Sandpoint, SonyNEWS, SHARK
		Dnard, and Zaurus machine modes.
		Experimenting with dyntrans to_be_translated read-ahead. It
		seems to give a very small performance increase for MIPS
		emulation, but a large performance degradation for SuperH. Hm.
20070522	Disabling correct SuperH ITLB emulation; it does not seem to be
		necessary in order to let SH4 guest OSes run, and it slows down
		userspace code.
		Implementing "samepage" branches for SuperH emulation, and some
		other minor speed hacks.
20070525	Continuing on M88K memory-related stuff: exceptions, memory
		transaction register contents, etc.
		Implementing the M88K subu.ci instruction.
		Removing the non-working (skeleton) Iyonix machine mode.
		OpenBSD/mvme88k reaches userland :-), starts executing
		/sbin/init's instructions, and issues a few syscalls, before
		crashing.
20070526	Fixing bugs in dev_mk48txx, so that OpenBSD/mvme88k detects
		the correct time-of-day.
		Implementing a generic IRQ controller for the test machines
		(dev_irqc), similar to a proposed patch from Petr Stepan.
		Experimenting some more with translation read-ahead.
		Adding an "expect" script for automated OpenBSD/landisk
		install regression/performance tests.
20070527	Adding a dummy mmEye (SH3) machine mode skeleton.
		FINALLY found the strange M88K bug I have been hunting: I had
		not emulated the SNIP value for exceptions occurring in
		branch delay slots correctly.
		Implementing correct exceptions for 64-bit M88K loads/stores.
		Address to symbol lookups are now disabled when M88K is
		running in usermode (because usermode addresses don't have
		anything to do with supervisor addresses).
20070531	Removing the mmEye machine mode skeleton.
20070604	Some minor code cleanup.
20070605	Moving src/useremul.c into a subdir (src/useremul/), and
		cleaning up some more legacy constructs.
		Adding -Wstrict-aliasing and -fstrict-aliasing detection to
		the configure script.
20070606	Adding a check for broken GCC on Solaris to the configure
		script. (GCC 3.4.3 on Solaris cannot handle static variables
		which are initialized to 0 or NULL. :-/)
		Removing the old (non-working) ARC emulation modes: NEC RD94,
		R94, R96, and R98, and the last traces of Olivetti M700 and
		Deskstation Tyne.
		Removing the non-working skeleton WDSC device (dev_wdsc).
20070607	Thinking about how to use the host's cc + ld at runtime to
		generate native code. (See experiments/native_cc_ld_test.i
		for an example.)
20070608	Adding a program counter sampling timer, which could be useful
		for native code generation experiments.
		The KN02_CSR_NRMMOD bit in the DECstation 5000/200 (KN02) CSR
		should always be set, to allow a 5000/200 PROM to boot.
20070609	Moving out breakpoint details from the machine struct into
		a helper struct, and removing the limit on max nr of
		breakpoints.
20070610	Moving out tick functions into a helper struct as well (which
		also gets rid of the max limit).
20070612	FINALLY figured out why Debian/DECstation stopped working when
		translation read-ahead was enabled: in src/memory_rw.c, the
		call to invalidate_code_translation was made also if the
		memory access was an instruction load (if the page was mapped
		as writable); it shouldn't be called in that case.
20070613	Implementing some more MIPS32/64 revision 2 instructions: di,
		ei, ext, dext, dextm, dextu, and ins.
20070614	Implementing an instruction combination for the NetBSD/arm
		idle loop (making the host not use any cpu if NetBSD/arm
		inside the emulator is not using any cpu).
		Increasing the nr of ARM VPH entries from 128 to 384.
20070615	Removing the ENABLE_arch stuff from the configure script, so
		that all included architectures are included in both release
		and development builds.
		Moving memory related helper functions from misc.c to memory.c.
		Adding preliminary instructions for netbooting NetBSD/pmppc to
		guestoses.html; it doesn't work yet, there are weird timeouts.
		Beginning a total rewrite of the userland emulation modes
		(removing all emulation modes, beginning from scratch with
		NetBSD/MIPS and FreeBSD/Alpha only).
20070616	After fixing a bug in the DEC21143 NIC (the TDSTAT_OWN bit was
		only cleared for the last segment when transmitting, not all
		segments), NetBSD/pmppc boots with root-on-nfs without the
		timeouts. Updating guestoses.html.
		Removing the skeleton PSP (Playstation Portable) mode.
		Moving X11-related stuff in the machine struct into a helper
		struct.
		Cleanup of out-of-memory checks, to use a new CHECK_ALLOCATION
		macro (which prints a meaningful error message).
		Adding a COMMENT to each machine and device (for automagic
		.index comment generation).
		Doing regression testing for the next release.

==============  RELEASE 0.4.6  ==============


1 /*
2 * Copyright (C) 2006-2007 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: dev_dreamcast_maple.c,v 1.17 2007/06/15 19:11:15 debug Exp $
29 *
30 * COMMENT: Dreamcast Maple bus controller
31 *
32 * The Maple bus has 4 ports (A-D), and each port has up to 6 possible "units"
33 * (where unit 0 is the main unit). Communication is done using DMA; each
34 * DMA transfer sends one or more requests, and for each of these requests
35 * a response is generated (or a timeout if there was no device at the
36 * specific port).
37 *
38 * See Marcus Comstedt's page (http://mc.pp.se/dc/maplebus.html) for more
39 * details about the DMA request/responses.
40 *
41 *
42 * TODO:
43 * Unit numbers / IDs for real Maple devices.
44 * The Controller (up/down/left/right, buttons, etc).
45 */
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <sys/time.h>
51
52 #include "console.h"
53 #include "cpu.h"
54 #include "device.h"
55 #include "machine.h"
56 #include "memory.h"
57 #include "misc.h"
58
59 #include "dreamcast_maple.h"
60 #include "dreamcast_sysasicvar.h"
61
62
63 #define debug fatal
64
65 #define N_MAPLE_PORTS 4
66
67 #define MAX_CHARS 8192
68 #define MAX_CONTROLLER_DATA 4096
69
70 #define MAPLE_TICK_SHIFT 17
71
72 struct maple_device {
73 struct maple_devinfo devinfo;
74 };
75
76 struct dreamcast_maple_data {
77 /* Registers: */
78 uint32_t dmaaddr;
79 int enable;
80 int timeout;
81
82 /* Attached devices: */
83 struct maple_device *device[N_MAPLE_PORTS];
84
85 /* For keyboard/controller input: */
86 int console_handle;
87 uint8_t char_queue[MAX_CHARS];
88 uint16_t controller_queue[MAX_CONTROLLER_DATA];
89 int char_queue_head, char_queue_tail;
90 int controller_queue_head, controller_queue_tail;
91 };
92
93
94 /*
95 * Maple devices:
96 *
97 * TODO: Figure out strings and numbers of _real_ Maple devices.
98 */
99 #if 0
100 static struct maple_device maple_device_controller = {
101 {
102 BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_CONTROLLER)), /* di_func */
103 { 0,0,0 }, /* di_function_data[3] */
104 0, /* di_area_code */
105 0, /* di_connector_direction */
106 "Dreamcast Controller", /* di_product_name */
107 "di_product_license", /* di_product_license */
108 LE16_TO_HOST(100), /* di_standby_power */
109 LE16_TO_HOST(100) /* di_max_power */
110 }
111 };
112 #endif
113 static struct maple_device maple_device_keyboard = {
114 {
115 BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_KEYBOARD)),/* di_func */
116 { LE32_TO_HOST(2),0,0 }, /* di_function_data[3] */
117 0, /* di_area_code */
118 0, /* di_connector_direction */
119 "Keyboard", /* di_product_name */
120 "di_product_license", /* di_product_license */
121 LE16_TO_HOST(100), /* di_standby_power */
122 LE16_TO_HOST(100) /* di_max_power */
123 }
124 };
125 #if 0
126 static struct maple_device maple_device_mouse = {
127 {
128 BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_MOUSE)),/* di_func */
129 { 0,0,0 }, /* di_function_data[3] */
130 0, /* di_area_code */
131 0, /* di_connector_direction */
132 "Dreamcast Mouse", /* di_product_name */
133 "di_product_license", /* di_product_license */
134 LE16_TO_HOST(100), /* di_standby_power */
135 LE16_TO_HOST(100) /* di_max_power */
136 }
137 };
138 #endif
139
140
141 DEVICE_TICK(maple)
142 {
143 struct dreamcast_maple_data *d = (struct dreamcast_maple_data *) extra;
144 int key;
145
146 while ((key = console_readchar(d->console_handle)) >= 0) {
147 /* Add to the keyboard queue: */
148 d->char_queue[d->char_queue_head] = key;
149 d->char_queue_head = (d->char_queue_head + 1) % MAX_CHARS;
150 if (d->char_queue_head == d->char_queue_tail)
151 fatal("[ dreamcast_maple: KEYBOARD QUEUE OVERRUN! ]\n");
152 }
153
154 #if 0
155 /*
156 * NOTE/TODO:
157 *
158 * Implement the controller in a reasonable way!
159 */
160
161 control_bits = 0;
162 switch (key) {
163 case 'a':
164 case 'A':
165 control_bits = 0x0004;
166 break;
167 case 'b':
168 case 'B':
169 control_bits = 0x0002;
170 break;
171 case 'c':
172 case 'C':
173 control_bits = 0x0001;
174 break;
175 case 'x':
176 case 'X':
177 control_bits = 0x0400;
178 break;
179 case 'y':
180 case 'Y':
181 control_bits = 0x0200;
182 break;
183 case 'z':
184 case 'Z':
185 control_bits = 0x0100;
186 break;
187 case 's':
188 case 'S': /* Start */
189 control_bits = 0x0008;
190 break;
191 case '8': /* up */
192 control_bits = 0x0010;
193 break;
194 case '2': /* down */
195 case 'k':
196 control_bits = 0x0020;
197 break;
198 case '4': /* left */
199 case 'u':
200 control_bits = 0x0040;
201 break;
202 case '6': /* right */
203 case 'o':
204 control_bits = 0x0080;
205 break;
206 }
207
208 if (control_bits != 0) {
209 /* Add to the controller queue: */
210 d->controller_queue[d->controller_queue_head] = control_bits;
211 d->controller_queue_head =
212 (d->controller_queue_head + 1) % MAX_CONTROLLER_DATA;
213 if (d->controller_queue_head == d->controller_queue_tail)
214 fatal("[ dreamcast_maple: CONTROLLER QUEUE "
215 "OVERRUN! ]\n");
216 }
217 #endif
218 }
219
220
221 static int get_key(struct dreamcast_maple_data *d)
222 {
223 int key = d->char_queue[d->char_queue_tail];
224 if (d->char_queue_head == d->char_queue_tail)
225 return -1;
226
227 d->char_queue_tail = (d->char_queue_tail + 1) % MAX_CHARS;
228 return key;
229 }
230
231
232 static int get_controller(struct dreamcast_maple_data *d)
233 {
234 int c = d->controller_queue[d->controller_queue_tail];
235 if (d->controller_queue_head == d->controller_queue_tail)
236 return 0;
237
238 d->controller_queue_tail = (d->controller_queue_tail + 1)
239 % MAX_CONTROLLER_DATA;
240 return c;
241 }
242
243
244 /*
245 * maple_getcond_controller_response():
246 *
247 * Generate a controller response. Based on info from Marcus
248 * Comstedt's page: http://mc.pp.se/dc/controller.html
249 */
250 static void maple_getcond_controller_response(struct dreamcast_maple_data *d,
251 struct cpu *cpu, int port, uint32_t receive_addr)
252 {
253 uint8_t buf[8];
254 uint32_t response_code, transfer_code;
255 int c;
256
257 transfer_code = (MAPLE_RESPONSE_DATATRF << 24) |
258 (((port << 6) | 0x20) << 16) |
259 ((port << 6) << 8) |
260 3 /* Transfer length in 32-bit words */;
261 transfer_code = BE32_TO_HOST(transfer_code);
262 cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &transfer_code,
263 4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
264 receive_addr += 4;
265
266 response_code = BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_CONTROLLER));
267 cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &response_code,
268 4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
269 receive_addr += 4;
270
271 /* NOTE: Inverse of the buttons pressed! */
272 c = ~get_controller(d);
273
274 /*
275 * buf[0..1] = little endian button bitfield
276 * buf[2] = right analogue trigger (0-255)
277 * buf[3] = left analogue trigger (0-255)
278 * buf[4] = analogue joystick X (0-255)
279 * buf[5] = analogue joystick Y (0-255)
280 * buf[6] = second analogue joystick X (0-255)
281 * buf[7] = second analogue joystick Y (0-255)
282 */
283 memset(buf, 0, 8);
284 buf[0] = c & 0xff;
285 buf[1] = c >> 8;
286 buf[4] = buf[5] = buf[6] = buf[7] = 0;
287
288 cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &buf, 8,
289 MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
290 }
291
292
293 /*
294 * maple_getcond_keyboard_response():
295 *
296 * Generate a keyboard key-press response. Based on info from Marcus
297 * Comstedt's page: http://mc.pp.se/dc/kbd.html
298 */
299 static void maple_getcond_keyboard_response(struct dreamcast_maple_data *d,
300 struct cpu *cpu, int port, uint32_t receive_addr)
301 {
302 int key;
303 uint8_t buf[8];
304 uint32_t response_code, transfer_code;
305
306 transfer_code = (MAPLE_RESPONSE_DATATRF << 24) |
307 (((port << 6) | 0x20) << 16) |
308 ((port << 6) << 8) |
309 3 /* Transfer length in 32-bit words */;
310 transfer_code = BE32_TO_HOST(transfer_code);
311 cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &transfer_code,
312 4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
313 receive_addr += 4;
314
315 response_code = BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_KEYBOARD));
316 cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &response_code,
317 4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
318 receive_addr += 4;
319
320 key = get_key(d);
321
322 /*
323 * buf[0] = shift keys (1 = left ctrl, 2 = shift, 0x10 = right ctrl)
324 * buf[1] = led state
325 * buf[2] = key
326 */
327 memset(buf, 0, 8);
328
329 if (key >= 'a' && key <= 'z') buf[2] = 4 + key - 'a';
330 if (key >= 'A' && key <= 'Z') buf[0] = 2, buf[2] = 4 + key - 'A';
331 if (key >= 1 && key <= 26) buf[0] = 1, buf[2] = 4 + key - 1;
332 if (key >= '1' && key <= '9') buf[2] = 0x1e + key - '1';
333 if (key == '!') buf[0] = 2, buf[2] = 0x1e;
334 if (key == '"') buf[0] = 2, buf[2] = 0x1f;
335 if (key == '#') buf[0] = 2, buf[2] = 0x20;
336 if (key == '$') buf[0] = 2, buf[2] = 0x21;
337 if (key == '%') buf[0] = 2, buf[2] = 0x22;
338 if (key == '^') buf[0] = 2, buf[2] = 0x23;
339 if (key == '&') buf[0] = 2, buf[2] = 0x24;
340 if (key == '*') buf[0] = 2, buf[2] = 0x25;
341 if (key == '(') buf[0] = 2, buf[2] = 0x26;
342 if (key == '@') buf[0] = 2, buf[2] = 0x1f;
343 if (key == '\n' || key == '\r') buf[0] = 0, buf[2] = 0x28;
344 if (key == ')') buf[0] = 2, buf[2] = 0x27;
345 if (key == '\b') buf[0] = 0, buf[2] = 0x2a;
346 if (key == '\t') buf[0] = 0, buf[2] = 0x2b;
347 if (key == ' ') buf[0] = 0, buf[2] = 0x2c;
348 if (key == '0') buf[2] = 0x27;
349 if (key == 27) buf[2] = 0x29;
350 if (key == '-') buf[2] = 0x2d;
351 if (key == '=') buf[2] = 0x2e;
352 if (key == '[') buf[2] = 0x2f;
353 if (key == '\\') buf[2] = 0x31;
354 if (key == '|') buf[2] = 0x31, buf[0] = 2;
355 if (key == ']') buf[2] = 0x32;
356 if (key == ';') buf[2] = 0x33;
357 if (key == ':') buf[2] = 0x34;
358 if (key == ',') buf[2] = 0x36;
359 if (key == '.') buf[2] = 0x37;
360 if (key == '/') buf[2] = 0x38;
361 if (key == '<') buf[2] = 0x36, buf[0] = 2;
362 if (key == '>') buf[2] = 0x37, buf[0] = 2;
363 if (key == '?') buf[2] = 0x38, buf[0] = 2;
364 if (key == '+') buf[2] = 0x57;
365
366 cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &buf, 8,
367 MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
368 }
369
370
371 /*
372 * maple_do_dma_xfer():
373 *
374 * Perform a DMA transfer. enable should be 1, and dmaaddr should point to
375 * the memory to transfer.
376 */
377 void maple_do_dma_xfer(struct cpu *cpu, struct dreamcast_maple_data *d)
378 {
379 uint32_t addr = d->dmaaddr;
380
381 if (!d->enable) {
382 fatal("[ maple_do_dma_xfer: not enabled? ]\n");
383 return;
384 }
385
386 /* debug("[ dreamcast_maple: DMA transfer, dmaaddr = "
387 "0x%08"PRIx32" ]\n", addr); */
388
389 /*
390 * DMA transfers must be 32-byte aligned, according to Marcus
391 * Comstedt's Maple demo program.
392 */
393 if (addr & 0x1f) {
394 fatal("[ dreamcast_maple: dmaaddr 0x%08"PRIx32" is NOT"
395 " 32-byte aligned; aborting ]\n", addr);
396 return;
397 }
398
399 /*
400 * Handle one or more requests/responses:
401 *
402 * (This is "reverse engineered" from Comstedt's maple demo program;
403 * it might not be good enough to emulate how the Maple is being
404 * used by other programs.)
405 */
406 for (;;) {
407 uint32_t receive_addr, response_code, cond;
408 int datalen, port, last_message, cmd, to, from, datalen_cmd;
409 int unit;
410 uint8_t buf[8];
411
412 /* Read the message' two control words: */
413 cpu->memory_rw(cpu, cpu->mem, addr, (void *) &buf, 8, MEM_READ,
414 NO_EXCEPTIONS | PHYSICAL);
415 addr += 8;
416
417 datalen = buf[0] * sizeof(uint32_t);
418 if (buf[1] & 2) {
419 fatal("[ dreamcast_maple: TODO: GUN bit. ]\n");
420 /* TODO: Set some bits in A05F80C4 to indicate
421 which raster position a lightgun is pointing
422 at! */
423 exit(1);
424 }
425 port = buf[2];
426 last_message = buf[3] & 0x80;
427 receive_addr = buf[4] + (buf[5] << 8) + (buf[6] << 16)
428 + (buf[7] << 24);
429
430 if (receive_addr & 0xe000001f)
431 fatal("[ dreamcast_maple: WARNING! receive address 0x"
432 "%08"PRIx32" isn't valid! ]\n", receive_addr);
433
434 /* Read the command word for this message: */
435 cpu->memory_rw(cpu, cpu->mem, addr, (void *) &buf, 4, MEM_READ,
436 NO_EXCEPTIONS | PHYSICAL);
437 addr += 4;
438
439 cmd = buf[0];
440 to = buf[1];
441 from = buf[2];
442 datalen_cmd = buf[3];
443
444 /* Decode the unit number: */
445 unit = 0;
446 switch (to & 0x3f) {
447 case 0x00:
448 case 0x20: unit = 0; break;
449 case 0x01: unit = 1; break;
450 case 0x02: unit = 2; break;
451 case 0x04: unit = 3; break;
452 case 0x08: unit = 4; break;
453 case 0x10: unit = 5; break;
454 default: fatal("[ dreamcast_maple: ERROR! multiple "
455 "units? Not yet implemented. to = 0x%02x ]\n", to);
456 exit(1);
457 }
458
459 /* debug("[ dreamcast_maple: cmd=0x%02x, port=%c, unit=%i"
460 ", datalen=%i words ]\n", cmd, port+'A', unit,
461 datalen_cmd); */
462
463 /*
464 * Handle the command:
465 */
466 switch (cmd) {
467
468 case MAPLE_COMMAND_DEVINFO:
469 if (d->device[port] == NULL || unit != 0) {
470 /* No device present: Timeout. */
471 /* debug("[ dreamcast_maple: response="
472 "timeout ]\n"); */
473 response_code = (uint32_t) -1;
474 response_code = LE32_TO_HOST(response_code);
475 cpu->memory_rw(cpu, cpu->mem, receive_addr,
476 (void *) &response_code, 4, MEM_WRITE,
477 NO_EXCEPTIONS | PHYSICAL);
478 } else {
479 /* Device present: */
480 unsigned int i;
481 struct maple_devinfo *di =
482 &d->device[port]->devinfo;
483 /* debug("[ dreamcast_maple: response="
484 "\"%s\" ]\n", di->di_product_name); */
485 response_code = MAPLE_RESPONSE_DEVINFO |
486 (((port << 6) | 0x20) << 8) |
487 ((port << 6) << 16) |
488 ((sizeof(struct maple_devinfo) /
489 sizeof(uint32_t)) << 24);
490 response_code = LE32_TO_HOST(response_code);
491 cpu->memory_rw(cpu, cpu->mem, receive_addr,
492 (void *) &response_code, 4, MEM_WRITE,
493 NO_EXCEPTIONS | PHYSICAL);
494 for (i=0; i<sizeof(struct maple_devinfo); i++)
495 cpu->memory_rw(cpu, cpu->mem,
496 receive_addr + 4 + i, (unsigned
497 char *) di + i, 1, MEM_WRITE,
498 NO_EXCEPTIONS | PHYSICAL);
499 }
500 break;
501
502 case MAPLE_COMMAND_GETCOND:
503 cpu->memory_rw(cpu, cpu->mem, addr, (void *) &buf, 4,
504 MEM_READ, NO_EXCEPTIONS | PHYSICAL);
505 cond = buf[3] + (buf[2] << 8) + (buf[1] << 16)
506 + (buf[0] << 24);
507 if (cond & MAPLE_FUNC(MAPLE_FN_CONTROLLER)) {
508 maple_getcond_controller_response(
509 d, cpu, port, receive_addr);
510 } else if (cond & MAPLE_FUNC(MAPLE_FN_KEYBOARD)) {
511 maple_getcond_keyboard_response(
512 d, cpu, port, receive_addr);
513 } else {
514 fatal("[ dreamcast_maple: WARNING: GETCOND: "
515 "UNIMPLEMENTED 0x%08"PRIx32" ]\n", cond);
516 }
517 break;
518
519 case MAPLE_COMMAND_BWRITE:
520 fatal("[ dreamcast_maple: BWRITE: TODO ]\n");
521 break;
522
523 default:fatal("[ dreamcast_maple: command %i: TODO ]\n", cmd);
524 exit(1);
525 }
526
527 addr += datalen_cmd * 4;
528
529 /* Last request? Then stop. */
530 if (last_message)
531 break;
532 }
533
534 /* Assert the SYSASIC_EVENT_MAPLE_DMADONE event: */
535 SYSASIC_TRIGGER_EVENT(SYSASIC_EVENT_MAPLE_DMADONE);
536 }
537
538
539 DEVICE_ACCESS(dreamcast_maple)
540 {
541 struct dreamcast_maple_data *d = extra;
542 uint64_t idata = 0, odata = 0;
543
544 if (writeflag == MEM_WRITE)
545 idata = memory_readmax64(cpu, data, len);
546
547 switch (relative_addr) {
548
549 case 0x04: /* MAPLE_DMAADDR */
550 if (writeflag == MEM_WRITE) {
551 d->dmaaddr = idata;
552 /* debug("[ dreamcast_maple: dmaaddr set to 0x%08x"
553 " ]\n", d->dmaaddr); */
554 } else {
555 fatal("[ dreamcast_maple: TODO: read from dmaaddr ]\n");
556 odata = d->dmaaddr;
557 }
558 break;
559
560 case 0x10: /* MAPLE_RESET2 */
561 if (writeflag == MEM_WRITE && idata != 0)
562 fatal("[ dreamcast_maple: UNIMPLEMENTED reset2 value"
563 " 0x%08x ]\n", (int)idata);
564 break;
565
566 case 0x14: /* MAPLE_ENABLE */
567 if (writeflag == MEM_WRITE)
568 d->enable = idata;
569 else
570 odata = d->enable;
571 break;
572
573 case 0x18: /* MAPLE_STATE */
574 if (writeflag == MEM_WRITE) {
575 switch (idata) {
576 case 0: break;
577 case 1: maple_do_dma_xfer(cpu, d);
578 break;
579 default:fatal("[ dreamcast_maple: UNIMPLEMENTED "
580 "state value %i ]\n", (int)idata);
581 }
582 } else {
583 /* Always return 0 to indicate DMA xfer complete. */
584 odata = 0;
585 }
586 break;
587
588 case 0x80: /* MAPLE_SPEED */
589 if (writeflag == MEM_WRITE) {
590 d->timeout = (idata >> 16) & 0xffff;
591 /* TODO: Bits 8..9 are "speed", but only the value
592 0 (indicating 2 Mbit/s) should be used. */
593 debug("[ dreamcast_maple: timeout set to %i ]\n",
594 d->timeout);
595 } else {
596 odata = d->timeout << 16;
597 }
598 break;
599
600 case 0x8c: /* MAPLE_RESET */
601 if (writeflag == MEM_WRITE) {
602 if (idata != 0x6155404f)
603 fatal("[ dreamcast_maple: UNIMPLEMENTED reset "
604 "value 0x%08x ]\n", (int)idata);
605 d->enable = 0;
606 }
607 break;
608
609 default:if (writeflag == MEM_READ) {
610 fatal("[ dreamcast_maple: UNIMPLEMENTED read from "
611 "addr 0x%x ]\n", (int)relative_addr);
612 } else {
613 fatal("[ dreamcast_maple: UNIMPLEMENTED write to addr "
614 "0x%x: 0x%x ]\n", (int)relative_addr, (int)idata);
615 }
616 }
617
618 if (writeflag == MEM_READ)
619 memory_writemax64(cpu, data, len, odata);
620
621 return 1;
622 }
623
624
625 DEVINIT(dreamcast_maple)
626 {
627 struct dreamcast_maple_data *d;
628
629 CHECK_ALLOCATION(d = malloc(sizeof(struct dreamcast_maple_data)));
630 memset(d, 0, sizeof(struct dreamcast_maple_data));
631
632 memory_device_register(devinit->machine->memory, devinit->name,
633 0x5f6c00, 0x100, dev_dreamcast_maple_access, d, DM_DEFAULT, NULL);
634
635 /* Devices connected to port A..D: */
636 d->device[0] = NULL; /* &maple_device_controller; */
637 d->device[1] = NULL;
638 d->device[2] = &maple_device_keyboard;
639 d->device[3] = NULL; /* TODO: &maple_device_mouse; */
640
641 d->console_handle = console_start_slave_inputonly(
642 devinit->machine, "maple", 1);
643 devinit->machine->main_console_handle = d->console_handle;
644
645 machine_add_tickfunction(devinit->machine, dev_maple_tick, d,
646 MAPLE_TICK_SHIFT);
647
648 return 1;
649 }
650

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