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

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Revision 12 - (show annotations)
Mon Oct 8 16:18:38 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 9511 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.905 2005/08/16 09:16:24 debug Exp $
20050628	Continuing the work on the ARM translation engine. end_of_page
		works. Experimenting with load/store translation caches
		(virtual -> physical -> host).
20050629	More ARM stuff (memory access translation cache, mostly). This
		might break a lot of stuff elsewhere, probably some MIPS-
		related translation things.
20050630	Many load/stores are now automatically generated and included
		into cpu_arm_instr.c; 1024 functions in total (!).
		Fixes based on feedback from Alec Voropay: only print 8 hex
		digits instead of 16 in some cases when emulating 32-bit
		machines; similar 8 vs 16 digit fix for breakpoint addresses;
		4Kc has 16 TLB entries, not 48; the MIPS config select1
		register is now printed with "reg ,0".
		Also changing many other occurances of 16 vs 8 digit output.
		Adding cache associativity fields to mips_cpu_types.h; updating
		some other cache fields; making the output of
		mips_cpu_dumpinfo() look nicer.
		Generalizing the bintrans stuff for device accesses to also
		work with the new translation system. (This might also break
		some MIPS things.)
		Adding multi-load/store instructions to the ARM disassembler
		and the translator, and some optimizations of various kinds.
20050701	Adding a simple dev_disk (it can read/write sectors from
		disk images).
20050712	Adding dev_ether (a simple ethernet send/receive device).
		Debugger command "ninstrs" for toggling show_nr_of_instructions
		during runtime.
		Removing the framebuffer logo.
20050713	Continuing on dev_ether.
		Adding a dummy cpu_alpha (again).
20050714	More work on cpu_alpha.
20050715	More work on cpu_alpha. Many instructions work, enough to run
		a simple framebuffer fill test (similar to the ARM test).
20050716	More Alpha stuff.
20050717	Minor updates (Alpha stuff).
20050718	Minor updates (Alpha stuff).
20050719	Generalizing some Alpha instructions.
20050720	More Alpha-related updates.
20050721	Continuing on cpu_alpha. Importing rpb.h from NetBSD/alpha.
20050722	Alpha-related updates: userland stuff (Hello World using
		write() compiled statically for FreeBSD/Alpha runs fine), and
		more instructions are now implemented.
20050723	Fixing ldq_u and stq_u.
		Adding more instructions (conditional moves, masks, extracts,
		shifts).
20050724	More FreeBSD/Alpha userland stuff, and adding some more
		instructions (inserts).
20050725	Continuing on the Alpha stuff. (Adding dummy ldt/stt.)
		Adding a -A command line option to turn off alignment checks
		in some cases (for translated code).
		Trying to remove the old bintrans code which updated the pc
		and nr_of_executed_instructions for every instruction.
20050726	Making another attempt att removing the pc/nr of instructions
		code. This time it worked, huge performance increase for
		artificial test code, but performance loss for real-world
		code :-( so I'm scrapping that code for now.
		Tiny performance increase on Alpha (by using ret instead of
		jmp, to play nice with the Alpha's branch prediction) for the
		old MIPS bintrans backend.
20050727	Various minor fixes and cleanups.
20050728	Switching from a 2-level virtual to host/physical translation
		system for ARM emulation, to a 1-level translation.
		Trying to switch from 2-level to 1-level for the MIPS bintrans
		system as well (Alpha only, so far), but there is at least one
		problem: caches and/or how they work with device mappings.
20050730	Doing the 2-level to 1-level conversion for the i386 backend.
		The cache/device bug is still there for R2K/3K :(
		Various other minor updates (Malta etc).
		The mc146818 clock now updates the UIP bit in a way which works
		better with Linux for at least sgimips and Malta emulation.
		Beginning the work on refactoring the dyntrans system.
20050731	Continuing the dyntrans refactoring.
		Fixing a small but serious host alignment bug in memory_rw.
		Adding support for big-endian load/stores to the i386 bintrans
		backend.
		Another minor i386 bintrans backend update: stores from the
		zero register are now one (or two) loads shorter.
		The slt and sltu instructions were incorrectly implemented for
		the i386 backend; only using them for 32-bit mode for now.
20050801	Continuing the dyntrans refactoring.
		Cleanup of the ns16550 serial controller (removing unnecessary
		code).
		Bugfix (memory corruption bug) in dev_gt, and a patch/hack from
		Alec Voropay for Linux/Malta.
20050802	More cleanup/refactoring of the dyntrans subsystem: adding
		phys_page pointers to the lookup tables, for quick jumps
		between translated pages.
		Better fix for the ns16550 device (but still no real FIFO
		functionality).
		Converting cpu_ppc to the new dyntrans system. This means that
		I will have to start from scratch with implementing each
		instruction, and figure out how to implement dual 64/32-bit
		modes etc.
		Removing the URISC CPU family, because it was useless.
20050803	When selecting a machine type, the main type can now be omitted
		if the subtype name is unique. (I.e. -E can be omitted.)
		Fixing a dyntrans/device update bug. (Writes to offset 0 of
		a device could sometimes go unnoticed.)
		Adding an experimental "instruction combination" hack for
		ARM for memset-like byte fill loops.
20050804	Minor progress on cpu_alpha and related things.
		Finally fixing the MIPS dmult/dmultu bugs.
		Fixing some minor TODOs.
20050805	Generalizing the 8259 PIC. It now also works with Cobalt
		and evbmips emulation, in addition to the x86 hack.
		Finally converting the ns16550 device to use devinit.
		Continuing the work on the dyntrans system. Thinking about
		how to add breakpoints.
20050806	More dyntrans updates. Breakpoints seem to work now.
20050807	Minor updates: cpu_alpha and related things; removing
		dev_malta (as it isn't used any more).
		Dyntrans: working on general "show trace tree" support.
		The trace tree stuff now works with both the old MIPS code and
		with newer dyntrans modes. :)
		Continuing on Alpha-related stuff (trying to get *BSD to boot
		a bit further, adding more instructions, etc).
20050808	Adding a dummy IA64 cpu family, and continuing the refactoring
		of the dyntrans system.
		Removing the regression test stuff, because it was more or
		less useless.
		Adding loadlinked/storeconditional type instructions to the
		Alpha emulation. (Needed for Linux/alpha. Not very well tested
		yet.)
20050809	The function call trace tree now prints a per-function nr of
		arguments. (Semi-meaningless, since that data isn't read yet
		from the ELFs; some hardcoded symbols such as memcpy() and
		strlen() work fine, though.)
		More dyntrans refactoring; taking out more of the things that
		are common to all cpu families.
20050810	Working on adding support for "dual mode" for PPC dyntrans
		(i.e. both 64-bit and 32-bit modes).
		(Re)adding some simple PPC instructions.
20050811	Adding a dummy M68K cpu family. The dyntrans system isn't ready
		for variable-length ISAs yet, so it's completely bogus so far.
		Re-adding more PPC instructions.
		Adding a hack to src/file.c which allows OpenBSD/mac68k a.out
		kernels to be loaded.
		Beginning to add PPC loads/stores. So far they only work in
		32-bit mode.
20050812	The configure file option "add_remote" now accepts symbolic
		host names, in addition to numeric IPv4 addresses.
		Re-adding more PPC instructions.
20050814	Continuing to port back more PPC instructions.
		Found and fixed the cache/device write-update bug for 32-bit
		MIPS bintrans. :-)
		Triggered a really weird and annoying bug in Compaq's C
		compiler; ccc sometimes outputs code which loads from an
		address _before_ checking whether the pointer was NULL or not.
		(I'm not sure how to handle this problem.)
20050815	Removing all of the old x86 instruction execution code; adding
		a new (dummy) dyntrans module for x86.
		Taking the first steps to extend the dyntrans system to support
		variable-length instructions.
		Slowly preparing for the next release.
20050816	Adding a dummy SPARC cpu module.
		Minor updates (documentation etc) for the release.

==============  RELEASE 0.3.5  ==============


1 /*
2 * Copyright (C) 2005 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: device.c,v 1.16 2005/08/10 22:25:50 debug Exp $
29 *
30 * Device registry framework.
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "device.h"
38 #include "misc.h"
39
40
41 static struct device_entry *device_entries = NULL;
42 static int device_entries_sorted = 0;
43 static int n_device_entries = 0;
44 static int device_exit_on_error = 1;
45
46
47 /*
48 * device_entry_compar():
49 *
50 * Internal function, used by sort_entries().
51 */
52 static int device_entry_compar(const void *a, const void *b)
53 {
54 struct device_entry *pa = (struct device_entry *) a;
55 struct device_entry *pb = (struct device_entry *) b;
56
57 return strcmp(pa->name, pb->name);
58 }
59
60
61 /*
62 * sort_entries():
63 *
64 * Internal function. Sorts the device_entries array in alphabetic order.
65 */
66 static void sort_entries(void)
67 {
68 qsort(device_entries, n_device_entries, sizeof(struct device_entry),
69 device_entry_compar);
70
71 device_entries_sorted = 1;
72 }
73
74
75 /*
76 * device_register():
77 *
78 * Registers a device. The device is added to the end of the device_entries
79 * array, and the sorted flag is set to zero.
80 *
81 * NOTE: It would be a bad thing if two devices had the same name. However,
82 * that isn't checked here, it is up to the caller!
83 *
84 * Return value is 1 if the device was registered, 0 otherwise.
85 */
86 int device_register(char *name, int (*initf)(struct devinit *))
87 {
88 device_entries = realloc(device_entries, sizeof(struct device_entry)
89 * (n_device_entries + 1));
90 if (device_entries == NULL) {
91 fprintf(stderr, "device_register(): out of memory\n");
92 exit(1);
93 }
94
95 memset(&device_entries[n_device_entries], 0,
96 sizeof(struct device_entry));
97
98 device_entries[n_device_entries].name = strdup(name);
99 device_entries[n_device_entries].initf = initf;
100
101 device_entries_sorted = 0;
102 n_device_entries ++;
103 return 1;
104 }
105
106
107 /*
108 * device_lookup():
109 *
110 * Lookup a device name by scanning the device_entries array (as a binary
111 * search tree).
112 *
113 * Return value is a pointer to the device_entry on success, or a NULL pointer
114 * if there was no such device.
115 */
116 struct device_entry *device_lookup(char *name)
117 {
118 int i, step, r, do_return = 0;
119
120 if (name == NULL) {
121 fprintf(stderr, "device_lookup(): NULL ptr\n");
122 exit(1);
123 }
124
125 if (!device_entries_sorted)
126 sort_entries();
127
128 if (n_device_entries == 0)
129 return NULL;
130
131 i = n_device_entries / 2;
132 step = i/2 + 1;
133
134 for (;;) {
135 if (i < 0)
136 i = 0;
137 if (i >= n_device_entries)
138 i = n_device_entries - 1;
139
140 /* printf("device_lookup(): i=%i step=%i\n", i, step);
141 printf(" name='%s', '%s'\n", name,
142 device_entries[i].name); */
143
144 r = strcmp(name, device_entries[i].name);
145
146 if (r < 0) {
147 /* Go left: */
148 i -= step;
149 if (step == 0)
150 i --;
151 } else if (r > 0) {
152 /* Go right: */
153 i += step;
154 if (step == 0)
155 i ++;
156 } else {
157 /* Found it! */
158 return &device_entries[i];
159 }
160
161 if (do_return)
162 return NULL;
163
164 if (step == 0)
165 do_return = 1;
166
167 if (step & 1)
168 step = (step/2) + 1;
169 else
170 step /= 2;
171 }
172 }
173
174
175 /*
176 * device_unregister():
177 *
178 * Unregisters a device.
179 *
180 * Return value is 1 if a device was unregistered, 0 otherwise.
181 */
182 int device_unregister(char *name)
183 {
184 ssize_t i;
185 struct device_entry *p = device_lookup(name);
186
187 if (p == NULL) {
188 fatal("device_unregister(): no such device (\"%s\")\n", name);
189 return 0;
190 }
191
192 i = (size_t)p - (size_t)device_entries;
193 i /= sizeof(struct device_entry);
194
195 free(device_entries[i].name);
196 device_entries[i].name = NULL;
197
198 if (i == n_device_entries-1) {
199 /* Do nothing if we're removing the last array element. */
200 } else {
201 /* Remove array element i by copying the last element
202 to i's position: */
203 device_entries[i] = device_entries[n_device_entries-1];
204
205 /* The array is not sorted anymore: */
206 device_entries_sorted = 0;
207 }
208
209 n_device_entries --;
210
211 /* TODO: realloc? */
212 return 1;
213 }
214
215
216 /*
217 * device_add():
218 *
219 * Add a device to a machine. For example: "kn210 addr=0x12340000" adds a
220 * device called "kn210" at a specific address.
221 *
222 * TODO: This function is quite ugly, and should be cleaned up.
223 */
224 void *device_add(struct machine *machine, char *name_and_params)
225 {
226 struct device_entry *p;
227 struct devinit devinit;
228 char *s2, *s3;
229 size_t len;
230
231 memset(&devinit, 0, sizeof(struct devinit));
232 devinit.machine = machine;
233
234 /* Default values: */
235 devinit.addr_mult = 1;
236 devinit.in_use = 1;
237
238 /* Get the device name first: */
239 s2 = name_and_params;
240 while (s2[0] != ',' && s2[0] != ' ' && s2[0] != '\0')
241 s2 ++;
242
243 len = (size_t)s2 - (size_t)name_and_params;
244 devinit.name = malloc(len + 1);
245 if (devinit.name == NULL) {
246 fprintf(stderr, "device_add(): out of memory\n");
247 exit(1);
248 }
249 memcpy(devinit.name, name_and_params, len);
250 devinit.name[len] = '\0';
251
252 p = device_lookup(devinit.name);
253 if (p == NULL) {
254 fatal("no such device (\"%s\")\n", devinit.name);
255 if (device_exit_on_error)
256 exit(1);
257 else
258 goto return_fail;
259 }
260
261 /* Get params from name_and_params: */
262 while (*s2 != '\0') {
263 /* Skip spaces, commas, and semicolons: */
264 while (*s2 == ' ' || *s2 == ',' || *s2 == ';')
265 s2 ++;
266
267 if (*s2 == '\0')
268 break;
269
270 /* s2 now points to the next param. eg "addr=1234" */
271
272 /* Get a word (until there is a '=' sign): */
273 s3 = s2;
274 while (*s3 != '=' && *s3 != '\0')
275 s3 ++;
276 if (s3 == s2) {
277 fatal("weird param: %s\n", s2);
278 if (device_exit_on_error)
279 exit(1);
280 else
281 goto return_fail;
282 }
283 s3 ++;
284 /* s3 now points to the parameter value ("1234") */
285
286 if (strncmp(s2, "addr=", 5) == 0) {
287 devinit.addr = mystrtoull(s3, NULL, 0);
288 } else if (strncmp(s2, "len=", 4) == 0) {
289 devinit.len = mystrtoull(s3, NULL, 0);
290 } else if (strncmp(s2, "addr_mult=", 10) == 0) {
291 devinit.addr_mult = mystrtoull(s3, NULL, 0);
292 } else if (strncmp(s2, "irq=", 4) == 0) {
293 devinit.irq_nr = mystrtoull(s3, NULL, 0);
294 } else if (strncmp(s2, "in_use=", 7) == 0) {
295 devinit.in_use = mystrtoull(s3, NULL, 0);
296 } else if (strncmp(s2, "name2=", 6) == 0) {
297 char *h = s2 + 6;
298 size_t len = 0;
299 while (*h && *h != ' ')
300 h++, len++;
301 devinit.name2 = malloc(len + 1);
302 if (devinit.name2 == NULL) {
303 fprintf(stderr, "out of memory\n");
304 exit(1);
305 }
306 snprintf(devinit.name2, len + 1, s2 + 6);
307 } else {
308 fatal("unknown param: %s\n", s2);
309 if (device_exit_on_error)
310 exit(1);
311 else
312 goto return_fail;
313 }
314
315 /* skip to the next param: */
316 s2 = s3;
317 while (*s2 != '\0' && *s2 != ' ' && *s2 != ',' && *s2 != ';')
318 s2 ++;
319 }
320
321
322 /*
323 * Call the init function for this device:
324 */
325
326 devinit.return_ptr = NULL;
327
328 if (!p->initf(&devinit)) {
329 fatal("error adding device (\"%s\")\n", name_and_params);
330 if (device_exit_on_error)
331 exit(1);
332 else
333 goto return_fail;
334 }
335
336 free(devinit.name);
337 return devinit.return_ptr;
338
339 return_fail:
340 free(devinit.name);
341 return NULL;
342 }
343
344
345 /*
346 * device_dumplist():
347 *
348 * Dump a list of all registered devices. (If the list is not sorted when
349 * this function is called, it is implicitly sorted.)
350 */
351 void device_dumplist(void)
352 {
353 int i;
354
355 if (!device_entries_sorted)
356 sort_entries();
357
358 for (i=0; i<n_device_entries; i++) {
359 debug(" %s", device_entries[i].name);
360
361 /* TODO: flags? */
362
363 debug("\n");
364 }
365 }
366
367
368 /*
369 * device_set_exit_on_error():
370 *
371 * This function selects the behaviour of the emulator when a device is not
372 * found. During startup, it is nicest to abort the whole emulator session,
373 * but if a device addition is attempted from within the debugger, then it is
374 * nicer to just print a warning and continue.
375 */
376 void device_set_exit_on_error(int exit_on_error)
377 {
378 device_exit_on_error = exit_on_error;
379 }
380
381
382 /*
383 * device_init():
384 *
385 * Initialize the device registry, and call autodev_init() to automatically
386 * add all normal devices (from the src/devices/ directory).
387 *
388 * This function should be called before any other device_*() function is used.
389 */
390 void device_init(void)
391 {
392 device_entries = NULL;
393 device_entries_sorted = 0;
394 n_device_entries = 0;
395
396 autodev_init();
397 }
398

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