/[gxemul]/trunk/src/interrupt.c
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Contents of /trunk/src/interrupt.c

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Revision 42 - (show annotations)
Mon Oct 8 16:22:32 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 8019 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: interrupt.c,v 1.12 2007/06/15 17:02:38 debug Exp $
29 *
30 * The interrupt subsystem.
31 *
32 * Interrupts have a "path", e.g. "emul[0].machine[0].cpu.5". A device which
33 * wishes to cause this interrupt needs to connect to it.
34 *
35 * The possible interrupt paths are registered by CPUs, interrupt controllers,
36 * etc., that have a way of receiving interrupt requests. The physical
37 * version of an interrupt path is usually a "pin" on the CPU, or similar.
38 *
39 * Once connected, the interrupt can be asserted or deasserted.
40 *
41 * For examples on how it is used, see the various devices in src/devices/.
42 */
43
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47
48 #include "interrupt.h"
49 #include "misc.h"
50
51
52 /* #define INTERRUPT_DEBUG */
53
54
55 struct interrupt_handler {
56 struct interrupt template;
57 int nr_of_exclusive_users;
58 int nr_of_nonexclusive_users;
59 };
60
61
62 static int nr_of_interrupt_handlers = 0;
63 static struct interrupt_handler *interrupt_handlers = NULL;
64
65
66 /*
67 * Dummy interrupt assert/deassert for "no interrupt" interrupts:
68 */
69 static void no_interrupt_assert(struct interrupt *i) { }
70 static void no_interrupt_deassert(struct interrupt *i) { }
71
72
73 /*
74 * interrupt_handler_register():
75 *
76 * Add an interrupt handler to the interrupt subsystem. The 'template'
77 * needs to have all members set.
78 *
79 * Name is of the form "emul[0].machine[0].cpu[0].irq[3].isa[14]" etc.
80 *
81 * If there already is a handler with this name, the emulator aborts.
82 */
83 void interrupt_handler_register(struct interrupt *template)
84 {
85 int i;
86
87 #ifdef INTERRUPT_DEBUG
88 printf("interrupt_handler_register(\"%s\")\n", template->name);
89 #endif
90
91 /* See if the name is already registered: */
92 for (i=0; i<nr_of_interrupt_handlers; i++) {
93 if (strcmp(template->name,
94 interrupt_handlers[i].template.name) != 0)
95 continue;
96
97 fatal("\ninterrupt_handler_register(): An interrupt handler"
98 " using the name '%s' is already registered.\n",
99 template->name);
100 exit(1);
101 }
102
103 nr_of_interrupt_handlers ++;
104 CHECK_ALLOCATION(interrupt_handlers = realloc(interrupt_handlers,
105 nr_of_interrupt_handlers * sizeof(struct interrupt_handler)));
106
107 interrupt_handlers[nr_of_interrupt_handlers-1].template = *template;
108 CHECK_ALLOCATION(interrupt_handlers[nr_of_interrupt_handlers-1].
109 template.name = strdup(template->name));
110 }
111
112
113 /*
114 * interrupt_handler_remove():
115 *
116 * Remove an interrupt handler from the interrupt subsystem. If there are
117 * still connected users of this interrupt, then an error message is printed
118 * and the emulator aborts.
119 */
120 void interrupt_handler_remove(char *name)
121 {
122 int i;
123
124 #ifdef INTERRUPT_DEBUG
125 printf("interrupt_handler_remove(\"%s\")\n", name);
126 #endif
127
128 for (i=0; i<nr_of_interrupt_handlers; i++) {
129 if (strcmp(name, interrupt_handlers[i].template.name) != 0)
130 continue;
131
132 /*
133 * Remove handler i, and return:
134 */
135 if (interrupt_handlers[i].nr_of_exclusive_users > 0 ||
136 interrupt_handlers[i].nr_of_nonexclusive_users > 0) {
137 fatal("interrupt_handler_remove(): Attempt to "
138 "remove interrupt handler '%s' which has %i "
139 "exclusive and %i non-exclusive users. Aborting.\n",
140 name, interrupt_handlers[i].nr_of_exclusive_users,
141 interrupt_handlers[i].nr_of_nonexclusive_users);
142 exit(1);
143 }
144
145 if (i != nr_of_interrupt_handlers-1)
146 memcpy(&interrupt_handlers[i],
147 &interrupt_handlers[i + 1],
148 nr_of_interrupt_handlers - i - 1);
149
150 nr_of_interrupt_handlers --;
151
152 return;
153 }
154
155 fatal("interrupt_handler_remove(): '%s' not found? Aborting.\n", name);
156 exit(1);
157 }
158
159
160 /*
161 * interrupt_handler_lookup():
162 *
163 * Scans the list of registered interrupt handlers for a given name. If the
164 * name is found, the template is filled with valid data, and 1 is returned.
165 * If the name is not found, 0 is returned.
166 */
167 int interrupt_handler_lookup(char *name, struct interrupt *template)
168 {
169 int i;
170
171 #ifdef INTERRUPT_DEBUG
172 printf("interrupt_handler_lookup(\"%s\")\n", name);
173 #endif
174
175 if (name[0] == '\0') {
176 /* No interrupt: */
177 memset(template, 0, sizeof(struct interrupt));
178 template->interrupt_assert = no_interrupt_assert;
179 template->interrupt_deassert = no_interrupt_deassert;
180 }
181
182 for (i=0; i<nr_of_interrupt_handlers; i++) {
183 if (strcmp(name, interrupt_handlers[i].template.name) != 0)
184 continue;
185
186 *template = interrupt_handlers[i].template;
187 return 1;
188 }
189
190 /* The 'if' is an ugly hack to prevent a Compaq CC warning. */
191 if (i >= nr_of_interrupt_handlers) {
192 printf("interrupt_handler_lookup(\"%s\") failed. "
193 "Aborting.\n", name);
194 abort();
195 }
196
197 return 0;
198 }
199
200
201 /*
202 * interrupt_connect():
203 *
204 * Increases the exclusive or nonexclusive nr or users of an interrupt.
205 */
206 void interrupt_connect(struct interrupt *in, int exclusive)
207 {
208 int i;
209
210 #ifdef INTERRUPT_DEBUG
211 printf("interrupt_connect(\"%s\")\n", in->name);
212 #endif
213
214 if (in->name == NULL || in->name[0] == '\0')
215 return;
216
217 for (i=0; i<nr_of_interrupt_handlers; i++) {
218 if (strcmp(in->name, interrupt_handlers[i].template.name) != 0)
219 continue;
220
221 if (exclusive) {
222 interrupt_handlers[i].nr_of_exclusive_users ++;
223 if (interrupt_handlers[i].nr_of_exclusive_users > 1) {
224 fatal("Fatal error in interrupt_connect(): "
225 "more than 1 exclusive user. Dumping "
226 "core for backtrace.\n");
227 abort();
228 }
229 } else {
230 interrupt_handlers[i].nr_of_nonexclusive_users ++;
231 }
232
233 return;
234 }
235
236 fatal("Internal error in interrupt_connect(): name '%s' not "
237 "found? Dumping core for debugging.\n", in->name);
238 abort();
239 }
240
241
242 /*
243 * interrupt_disconnect():
244 *
245 * Decreases the exclusive or nonexclusive nr or users of an interrupt.
246 */
247 void interrupt_disconnect(struct interrupt *in, int exclusive)
248 {
249 int i;
250
251 if (in->name == NULL || in->name[0] == '\0')
252 return;
253
254 for (i=0; i<nr_of_interrupt_handlers; i++) {
255 if (strcmp(in->name, interrupt_handlers[i].template.name) != 0)
256 continue;
257
258 if (exclusive) {
259 interrupt_handlers[i].nr_of_exclusive_users --;
260 if (interrupt_handlers[i].nr_of_exclusive_users < 0) {
261 fatal("Fatal error in interrupt_disconnect():"
262 "nr of exclusive users < 0?\n");
263 exit(1);
264 }
265 } else {
266 interrupt_handlers[i].nr_of_nonexclusive_users --;
267 if (interrupt_handlers[i].nr_of_nonexclusive_users<0) {
268 fatal("Fatal error in interrupt_disconnect():"
269 "nr of non-exclusive users < 0?\n");
270 exit(1);
271 }
272 }
273
274 return;
275 }
276
277 fatal("Internal error in interrupt_disconnect(): name '%s' not "
278 "found?\n", in->name);
279 exit(1);
280 }
281
282
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