/[gxemul]/trunk/src/devices/dev_dc7085.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
ViewVC logotype

Contents of /trunk/src/devices/dev_dc7085.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 42 - (show annotations)
Mon Oct 8 16:22:32 2007 UTC (16 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 8768 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) 2003-2007 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_dc7085.c,v 1.62 2007/06/15 18:44:19 debug Exp $
29 *
30 * COMMENT: DC7085 serial controller, used in some DECstation models
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "console.h"
38 #include "cpu.h"
39 #include "devices.h"
40 #include "machine.h"
41 #include "memory.h"
42 #include "misc.h"
43
44 #include "dc7085.h"
45
46
47 #define DC_TICK_SHIFT 14
48
49 #define MAX_QUEUE_LEN 32768
50
51 struct dc_data {
52 struct dc7085regs regs;
53
54 int console_handle;
55
56 /* For slow_serial_interrupts_hack_for_linux: */
57 int just_transmitted_something;
58
59 unsigned char rx_queue_char[MAX_QUEUE_LEN];
60 char rx_queue_lineno[MAX_QUEUE_LEN];
61 int cur_rx_queue_pos_write;
62 int cur_rx_queue_pos_read;
63
64 int tx_scanner;
65
66 struct interrupt irq;
67 int use_fb;
68
69 struct lk201_data lk201;
70 };
71
72
73 /*
74 * Add a character to the receive queue.
75 */
76 void add_to_rx_queue(void *e, int ch, int line_no)
77 {
78 struct dc_data *d = (struct dc_data *) e;
79 int entries_in_use = d->cur_rx_queue_pos_write -
80 d->cur_rx_queue_pos_read;
81
82 while (entries_in_use < 0)
83 entries_in_use += MAX_QUEUE_LEN;
84
85 /* Ignore mouse updates, if they come too often: */
86 if (entries_in_use > MAX_QUEUE_LEN/2 && line_no == DCMOUSE_PORT)
87 return;
88
89 d->rx_queue_char[d->cur_rx_queue_pos_write] = ch;
90 d->rx_queue_lineno[d->cur_rx_queue_pos_write] = line_no;
91 d->cur_rx_queue_pos_write ++;
92 if (d->cur_rx_queue_pos_write == MAX_QUEUE_LEN)
93 d->cur_rx_queue_pos_write = 0;
94
95 if (d->cur_rx_queue_pos_write == d->cur_rx_queue_pos_read)
96 fatal("warning: add_to_rx_queue(): rx_queue overrun!\n");
97 }
98
99
100 DEVICE_TICK(dc7085)
101 {
102 /*
103 * If a key is available from the keyboard, add it to the rx queue.
104 * If other bits are set, an interrupt might need to be caused.
105 */
106 struct dc_data *d = extra;
107 int avail;
108
109 if (cpu->machine->slow_serial_interrupts_hack_for_linux) {
110 /*
111 * Special hack to prevent Linux from Oopsing. (This makes
112 * interrupts not come as fast as possible.)
113 */
114 if (d->just_transmitted_something) {
115 d->just_transmitted_something --;
116 return;
117 }
118 }
119
120 d->regs.dc_csr &= ~CSR_RDONE;
121
122 if ((d->regs.dc_csr & CSR_MSE) && !(d->regs.dc_csr & CSR_TRDY)) {
123 int scanner_start = d->tx_scanner;
124
125 /* Loop until we've checked all 4 channels, or some
126 channel was ready to transmit: */
127
128 do {
129 d->tx_scanner = (d->tx_scanner + 1) % 4;
130
131 if (d->regs.dc_tcr & (1 << d->tx_scanner)) {
132 d->regs.dc_csr |= CSR_TRDY;
133 if (d->regs.dc_csr & CSR_TIE)
134 INTERRUPT_ASSERT(d->irq);
135
136 d->regs.dc_csr &= ~CSR_TX_LINE_NUM;
137 d->regs.dc_csr |= (d->tx_scanner << 8);
138 }
139 } while (!(d->regs.dc_csr & CSR_TRDY) &&
140 d->tx_scanner != scanner_start);
141
142 /* We have to return here. NetBSD can handle both
143 rx and tx interrupts simultaneously, but Ultrix
144 doesn't like that? */
145
146 if (d->regs.dc_csr & CSR_TRDY)
147 return;
148 }
149
150 lk201_tick(cpu->machine, &d->lk201);
151
152 avail = d->cur_rx_queue_pos_write != d->cur_rx_queue_pos_read;
153
154 if (avail && (d->regs.dc_csr & CSR_MSE))
155 d->regs.dc_csr |= CSR_RDONE;
156
157 if ((d->regs.dc_csr & CSR_RDONE) && (d->regs.dc_csr & CSR_RIE))
158 INTERRUPT_ASSERT(d->irq);
159 }
160
161
162 DEVICE_ACCESS(dc7085)
163 {
164 struct dc_data *d = extra;
165 uint64_t idata = 0, odata = 0;
166 size_t i;
167
168 if (writeflag == MEM_WRITE)
169 idata = memory_readmax64(cpu, data, len);
170
171 /* Always clear: */
172 d->regs.dc_csr &= ~CSR_CLR;
173
174 switch (relative_addr) {
175
176 case 0x00: /* CSR: Control and Status */
177 if (writeflag == MEM_WRITE) {
178 debug("[ dc7085 write to CSR: 0x%04x ]\n", idata);
179 idata &= (CSR_TIE | CSR_RIE | CSR_MSE | CSR_CLR
180 | CSR_MAINT);
181 d->regs.dc_csr &= ~(CSR_TIE | CSR_RIE | CSR_MSE
182 | CSR_CLR | CSR_MAINT);
183 d->regs.dc_csr |= idata;
184 if (!(d->regs.dc_csr & CSR_MSE))
185 d->regs.dc_csr &= ~(CSR_TRDY | CSR_RDONE);
186 goto do_return;
187 } else {
188 /* read: */
189
190 /* fatal("[ dc7085 read from CSR: (csr = 0x%04x) ]\n",
191 d->regs.dc_csr); */
192 odata = d->regs.dc_csr;
193 }
194 break;
195
196 case 0x08: /* LPR: */
197 if (writeflag == MEM_WRITE) {
198 debug("[ dc7085 write to LPR: 0x%04x ]\n", idata);
199 d->regs.dc_rbuf_lpr = idata;
200 goto do_return;
201 } else {
202 /* read: */
203 int avail = d->cur_rx_queue_pos_write !=
204 d->cur_rx_queue_pos_read;
205 int ch = 0, lineno = 0;
206 /* debug("[ dc7085 read from RBUF: "); */
207 if (avail) {
208 ch = d->rx_queue_char[d->cur_rx_queue_pos_read];
209 lineno = d->rx_queue_lineno[
210 d->cur_rx_queue_pos_read];
211 d->cur_rx_queue_pos_read++;
212 if (d->cur_rx_queue_pos_read == MAX_QUEUE_LEN)
213 d->cur_rx_queue_pos_read = 0;
214 /* if (ch >= ' ' && ch < 127)
215 debug("'%c'", ch);
216 else
217 debug("0x%x", ch);
218 debug(" for lineno %i ", lineno); */
219 } /* else
220 debug("empty ");
221 debug("]\n"); */
222 odata = (avail? RBUF_DVAL:0) |
223 (lineno << RBUF_LINE_NUM_SHIFT) | ch;
224
225 d->regs.dc_csr &= ~CSR_RDONE;
226 INTERRUPT_DEASSERT(d->irq);
227
228 d->just_transmitted_something = 4;
229 }
230 break;
231
232 case 0x10: /* TCR: */
233 if (writeflag == MEM_WRITE) {
234 /* fatal("[ dc7085 write to TCR: 0x%04x) ]\n",
235 (int)idata); */
236 d->regs.dc_tcr = idata;
237 d->regs.dc_csr &= ~CSR_TRDY;
238 INTERRUPT_DEASSERT(d->irq);
239 goto do_return;
240 } else {
241 /* read: */
242 /* debug("[ dc7085 read from TCR: (tcr = 0x%04x) ]\n",
243 d->regs.dc_tcr); */
244 odata = d->regs.dc_tcr;
245 }
246 break;
247
248 case 0x18: /* Modem status (R), transmit data (W) */
249 if (writeflag == MEM_WRITE) {
250 int line_no = (d->regs.dc_csr >>
251 RBUF_LINE_NUM_SHIFT) & 0x3;
252 idata &= 0xff;
253
254 lk201_tx_data(&d->lk201, line_no, idata);
255
256 d->regs.dc_csr &= ~CSR_TRDY;
257 INTERRUPT_DEASSERT(d->irq);
258
259 d->just_transmitted_something = 4;
260 } else {
261 /* read: */
262 d->regs.dc_msr_tdr |= MSR_DSR2 | MSR_CD2 |
263 MSR_DSR3 | MSR_CD3;
264 debug("[ dc7085 read from MSR: (msr_tdr = 0x%04x) ]\n",
265 d->regs.dc_msr_tdr);
266 odata = d->regs.dc_msr_tdr;
267 }
268 break;
269
270 default:
271 if (writeflag==MEM_READ) {
272 debug("[ dc7085 read from 0x%08lx ]\n",
273 (long)relative_addr);
274 } else {
275 debug("[ dc7085 write to 0x%08lx:",
276 (long)relative_addr);
277 for (i=0; i<len; i++)
278 debug(" %02x", data[i]);
279 debug(" ]\n");
280 }
281 }
282
283 if (writeflag == MEM_READ)
284 memory_writemax64(cpu, data, len, odata);
285
286 do_return:
287 dev_dc7085_tick(cpu, extra);
288
289 return 1;
290 }
291
292
293 /*
294 * dev_dc7085_init():
295 *
296 * Initialize a dc7085 serial controller device. use_fb should be non-zero
297 * if a framebuffer device is used. Channel 0 will then be treated as a
298 * DECstation keyboard, instead of a plain serial console.
299 */
300 int dev_dc7085_init(struct machine *machine, struct memory *mem,
301 uint64_t baseaddr, char *irq_path, int use_fb)
302 {
303 struct dc_data *d;
304
305 CHECK_ALLOCATION(d = malloc(sizeof(struct dc_data)));
306 memset(d, 0, sizeof(struct dc_data));
307
308 INTERRUPT_CONNECT(irq_path, d->irq);
309 d->use_fb = use_fb;
310
311 d->regs.dc_csr = CSR_TRDY | CSR_MSE;
312 d->regs.dc_tcr = 0x00;
313
314 d->console_handle = console_start_slave(machine, "DC7085", 1);
315
316 lk201_init(&d->lk201, use_fb, add_to_rx_queue, d->console_handle, d);
317
318 memory_device_register(mem, "dc7085", baseaddr, DEV_DC7085_LENGTH,
319 dev_dc7085_access, d, DM_DEFAULT, NULL);
320 machine_add_tickfunction(machine, dev_dc7085_tick, d,
321 DC_TICK_SHIFT);
322
323 return d->console_handle;
324 }
325

  ViewVC Help
Powered by ViewVC 1.1.26