1 /* Copyright (C) 2021 Free Software Foundation, Inc.
2 Contributed by Oracle.
3
4 This file is part of GNU Binutils.
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 3, or (at your option)
9 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, 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 /* Hardware counter profiling */
22 #include "hwcdrv.h"
23 #include "hwcfuncs.h"
24
25 /*---------------------------------------------------------------------------*/
26 /* macros */
27
28 #define IS_GLOBAL /* Mark global symbols */
29 #define HWCDRV_API static /* Mark functions used by hwcdrv API */
30
31 /*---------------------------------------------------------------------------*/
32 /* static variables */
33 static uint_t cpcN_npics;
34 static char hwcfuncs_errmsg_buf[1024];
35 static int hwcfuncs_errmsg_enabled = 1;
36 static int hwcfuncs_errmsg_valid;
37
38 /* --- user counter selections and options */
39 static unsigned hwcdef_cnt; /* number of *active* hardware counters */
40 static Hwcentry hwcdef[MAX_PICS]; /* HWC definitions */
41 static Hwcentry *hwctable[MAX_PICS]; /* HWC definitions */
42
43 /* --- drivers --- */
44
45 // default driver
46
47 HWCDRV_API int
hwcdrv_init(hwcfuncs_abort_fn_t abort_ftn,int * tsd_sz)48 hwcdrv_init (hwcfuncs_abort_fn_t abort_ftn, int* tsd_sz)
49 {
50 return -1;
51 }
52
53 HWCDRV_API void
hwcdrv_get_info(int * cpuver,const char ** cciname,uint_t * npics,const char ** docref,uint64_t * support)54 hwcdrv_get_info (
55 int * cpuver, const char ** cciname,
56 uint_t * npics, const char ** docref, uint64_t* support) { }
57
58 HWCDRV_API int
hwcdrv_enable_mt(hwcfuncs_tsd_get_fn_t tsd_ftn)59 hwcdrv_enable_mt (hwcfuncs_tsd_get_fn_t tsd_ftn)
60 {
61 return -1;
62 }
63
64 HWCDRV_API int
hwcdrv_get_descriptions(hwcf_hwc_cb_t * hwc_find_action,hwcf_attr_cb_t * attr_find_action)65 hwcdrv_get_descriptions (hwcf_hwc_cb_t *hwc_find_action,
66 hwcf_attr_cb_t *attr_find_action)
67 {
68 return 0;
69 }
70
71 HWCDRV_API int
hwcdrv_assign_regnos(Hwcentry * entries[],unsigned numctrs)72 hwcdrv_assign_regnos (Hwcentry *entries[], unsigned numctrs)
73 {
74 return -1;
75 }
76
77 HWCDRV_API int
hwcdrv_create_counters(unsigned hwcdef_cnt,Hwcentry * hwcdef)78 hwcdrv_create_counters (unsigned hwcdef_cnt, Hwcentry *hwcdef)
79 {
80 return -1;
81 }
82
83 HWCDRV_API int
hwcdrv_read_events(hwc_event_t * events,hwc_event_samples_t * samples)84 hwcdrv_read_events (hwc_event_t *events, hwc_event_samples_t*samples)
85 {
86 return -1;
87 }
88
89 HWCDRV_API int
hwcdrv_start(void)90 hwcdrv_start (void)
91 {
92 return -1;
93 }
94
95 HWCDRV_API int
hwcdrv_overflow(siginfo_t * si,hwc_event_t * s,hwc_event_t * t)96 hwcdrv_overflow (siginfo_t *si, hwc_event_t *s, hwc_event_t *t)
97 {
98 return 0;
99 }
100
101 HWCDRV_API int
hwcdrv_sighlr_restart(const hwc_event_t * sample)102 hwcdrv_sighlr_restart (const hwc_event_t *sample)
103 {
104 return -1;
105 }
106
107 HWCDRV_API int
hwcdrv_lwp_suspend(void)108 hwcdrv_lwp_suspend (void)
109 {
110 return -1;
111 }
112
113 HWCDRV_API int
hwcdrv_lwp_resume(void)114 hwcdrv_lwp_resume (void)
115 {
116 return -1;
117 }
118
119 HWCDRV_API int
hwcdrv_free_counters(void)120 hwcdrv_free_counters (void)
121 {
122 return 0;
123 }
124
125 HWCDRV_API int
hwcdrv_lwp_init(void)126 hwcdrv_lwp_init (void)
127 {
128 return 0;
129 }
130
131 HWCDRV_API void
hwcdrv_lwp_fini(void)132 hwcdrv_lwp_fini (void) { }
133
134 static hwcdrv_api_t hwcdrv_default = {
135 hwcdrv_init,
136 hwcdrv_get_info,
137 hwcdrv_enable_mt,
138 hwcdrv_get_descriptions,
139 hwcdrv_assign_regnos,
140 hwcdrv_create_counters,
141 hwcdrv_start,
142 hwcdrv_overflow,
143 hwcdrv_read_events,
144 hwcdrv_sighlr_restart,
145 hwcdrv_lwp_suspend,
146 hwcdrv_lwp_resume,
147 hwcdrv_free_counters,
148 hwcdrv_lwp_init,
149 hwcdrv_lwp_fini,
150 -1 // hwcdrv_init_status
151 };
152
153 static hwcdrv_api_t *hwcdrv_driver = &hwcdrv_default;
154
155
156 /*---------------------------------------------------------------------------*/
157 /* misc */
158
159 /* print a counter definition (for debugging) */
160 static void
ctrdefprint(int dbg_lvl,const char * hdr,Hwcentry * phwcdef)161 ctrdefprint (int dbg_lvl, const char * hdr, Hwcentry*phwcdef)
162 {
163 TprintfT (dbg_lvl, "%s: name='%s', int_name='%s',"
164 " reg_num=%d, timecvt=%d, memop=%d, "
165 "interval=%d, tag=%u, reg_list=%p\n",
166 hdr, phwcdef->name, phwcdef->int_name, phwcdef->reg_num,
167 phwcdef->timecvt, phwcdef->memop, phwcdef->val,
168 phwcdef->sort_order, phwcdef->reg_list);
169 }
170
171 /*---------------------------------------------------------------------------*/
172 /* errmsg buffering */
173
174 /* errmsg buffering is needed only because the most descriptive error
175 messages from CPC are delivered using a callback mechanism.
176 hwcfuncs_errmsg_get() should only be used during initialization, and
177 ideally, only to provide feedback to an end user when his counters can't
178 be bound to HW.
179 */
180 IS_GLOBAL char *
hwcfuncs_errmsg_get(char * buf,size_t bufsize,int enable)181 hwcfuncs_errmsg_get (char *buf, size_t bufsize, int enable)
182 {
183 hwcfuncs_errmsg_enabled = 0;
184 if (buf && bufsize)
185 {
186 if (hwcfuncs_errmsg_valid)
187 {
188 strncpy (buf, hwcfuncs_errmsg_buf, bufsize);
189 buf[bufsize - 1] = 0;
190 }
191 else
192 *buf = 0;
193 }
194 hwcfuncs_errmsg_buf[0] = 0;
195 hwcfuncs_errmsg_valid = 0;
196 hwcfuncs_errmsg_enabled = enable;
197 return buf;
198 }
199
200 /* used by cpc to log an error */
201 IS_GLOBAL void
hwcfuncs_int_capture_errmsg(const char * fn,int subcode,const char * fmt,va_list ap)202 hwcfuncs_int_capture_errmsg (const char *fn, int subcode,
203 const char *fmt, va_list ap)
204 {
205 if (hwcfuncs_errmsg_enabled &&
206 !hwcfuncs_errmsg_valid)
207 {
208 vsnprintf (hwcfuncs_errmsg_buf, sizeof (hwcfuncs_errmsg_buf), fmt, ap);
209 TprintfT (DBG_LT0, "hwcfuncs: cpcN_capture_errmsg(): %s\n",
210 hwcfuncs_errmsg_buf);
211 hwcfuncs_errmsg_valid = 1;
212 }
213 return;
214 }
215
216 /* Log an internal error to the CPC error buffer.
217 * Note: only call this during init functions.
218 * Note: when most cpc calls fail, they will call cpcN_capture_errmsg()
219 * directly, so only call logerr() when a non-cpc function fails.
220 */
221 IS_GLOBAL void
hwcfuncs_int_logerr(const char * format,...)222 hwcfuncs_int_logerr (const char *format, ...)
223 {
224 va_list va;
225 va_start (va, format);
226 hwcfuncs_int_capture_errmsg ("logerr", 0, format, va);
227 va_end (va);
228 }
229
230 /* utils to parse counter strings */
231 static void
clear_hwcdefs()232 clear_hwcdefs ()
233 {
234 for (unsigned idx = 0; idx < MAX_PICS; idx++)
235 {
236 static Hwcentry empty;
237 hwcdef[idx] = empty; // leaks strings and reg_list array
238 hwcdef[idx].reg_num = REGNO_ANY;
239 hwcdef[idx].val = -1;
240 hwcdef[idx].sort_order = -1;
241 }
242 }
243
244 /* initialize hwcdef[] based on user's counter definitions */
245 static int
process_data_descriptor(const char * defstring)246 process_data_descriptor (const char *defstring)
247 {
248 /*
249 * <defstring> format should be of format
250 * :%s:%s:0x%x:%d:%lld:%d:%d:0x%x[,%s...repeat for each ctr]
251 * where the counter fields are:
252 * :<userName>:<internalCtr>:<register>:<timeoutVal>[:m<min_time>]:<tag>:<timecvt>:<memop>
253 * See Coll_Ctrl::build_data_desc().
254 */
255 int err = 0;
256 char *ds = NULL;
257 char *dsp = NULL;
258 unsigned idx;
259
260 clear_hwcdefs ();
261 if (!defstring || !strlen (defstring))
262 {
263 err = HWCFUNCS_ERROR_HWCARGS;
264 goto ext_hw_install_end;
265 }
266 ds = strdup (defstring);
267 if (!ds)
268 {
269 err = HWCFUNCS_ERROR_HWCINIT;
270 goto ext_hw_install_end;
271 }
272 dsp = ds;
273
274 for (idx = 0; idx < MAX_PICS && *dsp; idx++)
275 {
276 char *name = NULL;
277 char *int_name = NULL;
278 regno_t reg = REGNO_ANY;
279 ABST_type memop = ABST_NONE;
280 int interval = 0;
281 int timecvt = 0;
282 unsigned sort_order = (unsigned) - 1;
283
284 /* name */
285 name = dsp;
286 dsp = strchr (dsp, ':');
287 if (dsp == NULL)
288 {
289 err = HWCFUNCS_ERROR_HWCARGS;
290 goto ext_hw_install_end;
291 }
292 *dsp++ = (char) 0;
293
294 /* int_name */
295 int_name = dsp;
296 dsp = strchr (dsp, ':');
297 if (dsp == NULL)
298 {
299 err = HWCFUNCS_ERROR_HWCARGS;
300 goto ext_hw_install_end;
301 }
302 *dsp++ = (char) 0;
303
304 /* reg_num */
305 reg = (int) strtol (dsp, &dsp, 0);
306 if (*dsp++ != ':')
307 {
308 err = HWCFUNCS_ERROR_HWCARGS;
309 goto ext_hw_install_end;
310 }
311 if (reg < 0 && reg != -1)
312 {
313 err = HWCFUNCS_ERROR_HWCARGS;
314 goto ext_hw_install_end;
315 }
316 if (reg >= 0)
317 hwcdef[idx].reg_num = reg;
318
319 /* val */
320 interval = (int) strtol (dsp, &dsp, 0);
321 if (*dsp++ != ':')
322 {
323 err = HWCFUNCS_ERROR_HWCARGS;
324 goto ext_hw_install_end;
325 }
326 if (interval < 0)
327 {
328 err = HWCFUNCS_ERROR_HWCARGS;
329 goto ext_hw_install_end;
330 }
331 hwcdef[idx].val = interval;
332
333 /* min_time */
334 /*
335 * This is a new field.
336 * An old launcher (dbx, etc.) would not include it.
337 * Detect the presence of the field by the char 'm'.
338 */
339 if (*dsp == 'm')
340 {
341 long long tmp_ll = 0;
342 dsp++;
343 tmp_ll = strtoll (dsp, &dsp, 0);
344 if (*dsp++ != ':')
345 {
346 err = HWCFUNCS_ERROR_HWCARGS;
347 goto ext_hw_install_end;
348 }
349 if (tmp_ll < 0)
350 {
351 err = HWCFUNCS_ERROR_HWCARGS;
352 goto ext_hw_install_end;
353 }
354 hwcdef[idx].min_time = tmp_ll;
355 }
356 else
357 hwcdef[idx].min_time = 0;
358
359 /* sort_order */
360 sort_order = (int) strtoul (dsp, &dsp, 0);
361 if (*dsp++ != ':')
362 {
363 err = HWCFUNCS_ERROR_HWCARGS;
364 goto ext_hw_install_end;
365 }
366 hwcdef[idx].sort_order = sort_order;
367
368 /* timecvt */
369 timecvt = (int) strtol (dsp, &dsp, 0);
370 if (*dsp++ != ':')
371 {
372 err = HWCFUNCS_ERROR_HWCARGS;
373 goto ext_hw_install_end;
374 }
375 hwcdef[idx].timecvt = timecvt;
376
377 /* memop */
378 memop = (ABST_type) strtol (dsp, &dsp, 0);
379 if (*dsp != 0 && *dsp++ != ',')
380 {
381 err = HWCFUNCS_ERROR_HWCARGS;
382 goto ext_hw_install_end;
383 }
384 hwcdef[idx].memop = memop;
385 if (*name)
386 hwcdef[idx].name = strdup (name);
387 else
388 hwcdef[idx].name = strdup (int_name);
389 if (*int_name)
390 hwcdef[idx].int_name = strdup (int_name);
391 else
392 hwcdef[idx].int_name = strdup (name);
393 ctrdefprint (DBG_LT1, "hwcfuncs: process_data_descriptor", &hwcdef[idx]);
394 }
395
396 if (*dsp)
397 {
398 TprintfT (DBG_LT0, "hwcfuncs: ERROR: process_data_descriptor(): "
399 "ctr string had some trailing garbage:"
400 " '%s'\n", dsp);
401 err = HWCFUNCS_ERROR_HWCARGS;
402 goto ext_hw_install_end;
403 }
404 free (ds);
405 hwcdef_cnt = idx;
406 return 0;
407
408 ext_hw_install_end:
409 if (dsp && *dsp)
410 {
411 TprintfT (DBG_LT0, "hwcfuncs: ERROR: process_data_descriptor(): "
412 " syntax error just before:"
413 " '%s;\n", dsp);
414 logerr (GTXT ("Data descriptor syntax error near `%s'\n"), dsp);
415 }
416 else
417 logerr (GTXT ("Data descriptor syntax error\n"));
418 free (ds);
419 return err;
420 }
421
422 /* initialize hwcdef[] based on user's counter definitions */
423 static int
process_hwcentrylist(const Hwcentry * entries[],unsigned numctrs)424 process_hwcentrylist (const Hwcentry* entries[], unsigned numctrs)
425 {
426 int err = 0;
427 clear_hwcdefs ();
428 if (numctrs > cpcN_npics)
429 {
430 logerr (GTXT ("More than %d counters were specified\n"), cpcN_npics); /*!*/
431 return HWCFUNCS_ERROR_HWCARGS;
432 }
433 for (unsigned idx = 0; idx < numctrs; idx++)
434 {
435 Hwcentry *phwcdef = &hwcdef[idx];
436 *phwcdef = *entries[idx];
437 if (phwcdef->name)
438 phwcdef->name = strdup (phwcdef->name);
439 else
440 phwcdef->name = "NULL";
441 if (phwcdef->int_name)
442 phwcdef->int_name = strdup (phwcdef->int_name);
443 else
444 phwcdef->int_name = "NULL";
445 if (phwcdef->val < 0)
446 {
447 logerr (GTXT ("Negative interval specified for HW counter `%s'\n"), /*!*/
448 phwcdef->name);
449 err = HWCFUNCS_ERROR_HWCARGS;
450 break;
451 }
452 ctrdefprint (DBG_LT1, "hwcfuncs: process_hwcentrylist", phwcdef);
453 }
454 if (!err)
455 hwcdef_cnt = numctrs;
456 return err;
457 }
458
459 /* see hwcfuncs.h */
460 IS_GLOBAL void *
hwcfuncs_parse_attrs(const char * countername,hwcfuncs_attr_t attrs[],unsigned max_attrs,uint_t * pnum_attrs,char ** errstring)461 hwcfuncs_parse_attrs (const char *countername, hwcfuncs_attr_t attrs[],
462 unsigned max_attrs, uint_t *pnum_attrs, char**errstring)
463 {
464 char *head = NULL;
465 char *tail = NULL;
466 uint_t nattrs = 0;
467 char *counter_copy;
468 int success = 0;
469 char errbuf[512];
470 errbuf[0] = 0;
471 counter_copy = strdup (countername);
472
473 /* advance pointer to first attribute */
474 tail = strchr (counter_copy, HWCFUNCS_PARSE_ATTR);
475 if (tail)
476 *tail = 0;
477
478 /* remove regno and value, if supplied */
479 {
480 char *tmp = strchr (counter_copy, HWCFUNCS_PARSE_REGNUM);
481 if (tmp)
482 *tmp = 0;
483 tmp = strchr (counter_copy, HWCFUNCS_PARSE_VALUE);
484 if (tmp)
485 *tmp = 0;
486 }
487
488 while (tail)
489 {
490 char *pch;
491 if (nattrs >= max_attrs)
492 {
493 snprintf (errbuf, sizeof (errbuf),
494 GTXT ("Too many attributes defined in `%s'"),
495 countername);
496 goto mycpc2_parse_attrs_end;
497 }
498 /* get attribute name */
499 head = tail + 1;
500 tail = strchr (head, HWCFUNCS_PARSE_EQUAL);
501 if (!tail)
502 {
503 snprintf (errbuf, sizeof (errbuf),
504 GTXT ("Missing value for attribute `%s' in `%s'"),
505 head, countername);
506 goto mycpc2_parse_attrs_end;
507 }
508 *tail = 0; /* null terminate current component */
509 attrs[nattrs].ca_name = head;
510
511 /* get attribute value */
512 head = tail + 1;
513 tail = strchr (head, HWCFUNCS_PARSE_ATTR);
514 if (tail)
515 *tail = 0; /* null terminate current component */
516 attrs[nattrs].ca_val = strtoull (head, &pch, 0);
517 if (pch == head)
518 {
519 snprintf (errbuf, sizeof (errbuf),
520 GTXT ("Illegal value for attribute `%s' in `%s'"),
521 attrs[nattrs].ca_name, countername);
522 goto mycpc2_parse_attrs_end;
523 }
524 TprintfT (DBG_LT0, "hwcfuncs: pic_: '%s', attribute[%u]"
525 " '%s' = 0x%llx\n",
526 counter_copy, nattrs, attrs[nattrs].ca_name,
527 (long long unsigned int) attrs[nattrs].ca_val);
528
529 nattrs++;
530 }
531 success = 1;
532
533 mycpc2_parse_attrs_end:
534 *pnum_attrs = nattrs;
535 if (success)
536 {
537 if (errstring)
538 *errstring = NULL;
539 }
540 else
541 {
542 if (errstring)
543 *errstring = strdup (errbuf);
544 free (counter_copy);
545 counter_copy = NULL;
546 }
547 return counter_copy;
548 }
549
550 IS_GLOBAL void
hwcfuncs_parse_ctr(const char * counter_def,int * pplus,char ** pnameOnly,char ** pattrs,char ** pregstr,regno_t * pregno)551 hwcfuncs_parse_ctr (const char *counter_def, int *pplus, char **pnameOnly,
552 char **pattrs, char **pregstr, regno_t *pregno)
553 {
554 char *nameptr, *copy, *slash, *attr_delim;
555 int plus;
556 regno_t regno;
557 nameptr = copy = strdup (counter_def);
558
559 /* plus */
560 plus = 0;
561 if (nameptr[0] == HWCFUNCS_PARSE_BACKTRACK)
562 {
563 plus = 1;
564 nameptr++;
565 }
566 else if (nameptr[0] == HWCFUNCS_PARSE_BACKTRACK_OFF)
567 {
568 plus = -1;
569 nameptr++;
570 }
571 if (pplus)
572 *pplus = plus;
573
574 /* regno */
575 regno = REGNO_ANY;
576 if (pregstr)
577 *pregstr = NULL;
578 slash = strchr (nameptr, HWCFUNCS_PARSE_REGNUM);
579 if (slash != NULL)
580 {
581 /* the remaining string should be a number > 0 */
582 if (pregstr)
583 *pregstr = strdup (slash);
584 char *endchar = NULL;
585 regno = (regno_t) strtol (slash + 1, &endchar, 0);
586 if (*endchar != 0)
587 regno = -2;
588 if (*(slash + 1) == '-')
589 regno = -2;
590 /* terminate previous element up to slash */
591 *slash = 0;
592 }
593 if (pregno)
594 *pregno = regno;
595
596 /* attrs */
597 if (pattrs)
598 *pattrs = NULL;
599 attr_delim = strchr (nameptr, HWCFUNCS_PARSE_ATTR);
600 if (attr_delim != NULL)
601 {
602 if (pattrs)
603 *pattrs = strdup (attr_delim);
604 /* terminate previous element up to attr_delim */
605 *attr_delim++ = 0;
606 }
607 if (pnameOnly)
608 *pnameOnly = strdup (nameptr);
609 free (copy);
610 }
611
612 /* create counters */
613 IS_GLOBAL int
hwcfuncs_bind_descriptor(const char * defstring)614 hwcfuncs_bind_descriptor (const char *defstring)
615 {
616 int err = process_data_descriptor (defstring);
617 if (err)
618 {
619 TprintfT (DBG_LT0, "hwcfuncs: ERROR: hwcfuncs_bind_descriptor failed\n");
620 return err;
621 }
622 err = hwcdrv_driver->hwcdrv_create_counters (hwcdef_cnt, hwcdef);
623 return err;
624 }
625
626 /* see hwcfuncs.h */
627 IS_GLOBAL int
hwcfuncs_bind_hwcentry(const Hwcentry * entries[],unsigned numctrs)628 hwcfuncs_bind_hwcentry (const Hwcentry* entries[], unsigned numctrs)
629 {
630 int err = -1;
631 err = process_hwcentrylist (entries, numctrs);
632 if (err)
633 {
634 TprintfT (DBG_LT0, "hwcfuncs: ERROR: hwcfuncs_bind_hwcentry\n");
635 return err;
636 }
637 err = hwcdrv_driver->hwcdrv_create_counters (hwcdef_cnt, hwcdef);
638 return err;
639 }
640
641 /* see hwcfuncs.h */
642 IS_GLOBAL Hwcentry **
hwcfuncs_get_ctrs(unsigned * defcnt)643 hwcfuncs_get_ctrs (unsigned *defcnt)
644 {
645 if (defcnt)
646 *defcnt = hwcdef_cnt;
647 return hwctable;
648 }
649
650 /* return 1 if <regno> is in Hwcentry's list */
651 IS_GLOBAL int
regno_is_valid(const Hwcentry * pctr,regno_t regno)652 regno_is_valid (const Hwcentry * pctr, regno_t regno)
653 {
654 regno_t *reg_list = pctr->reg_list;
655 if (REG_LIST_IS_EMPTY (reg_list))
656 return 0;
657 if (regno == REGNO_ANY) /* wildcard */
658 return 1;
659 for (int ii = 0; ii < MAX_PICS; ii++)
660 {
661 regno_t tmp = reg_list[ii];
662 if (REG_LIST_EOL (tmp)) /* end of list */
663 break;
664 if (tmp == regno) /* is in list */
665 return 1;
666 }
667 return 0;
668 }
669
670 /* supplied by hwcdrv_api drivers */
671 IS_GLOBAL int
hwcfuncs_assign_regnos(Hwcentry * entries[],unsigned numctrs)672 hwcfuncs_assign_regnos (Hwcentry* entries[],
673 unsigned numctrs)
674 {
675 if (numctrs > cpcN_npics)
676 {
677 logerr (GTXT ("More than %d counters were specified\n"), cpcN_npics); /*!*/
678 return HWCFUNCS_ERROR_HWCARGS;
679 }
680 return hwcdrv_driver->hwcdrv_assign_regnos (entries, numctrs);
681 }
682
683 extern hwcdrv_api_t hwcdrv_pcl_api;
684 static int hwcdrv_driver_inited = 0;
685
686 hwcdrv_api_t *
get_hwcdrv()687 get_hwcdrv ()
688 {
689 if (hwcdrv_driver_inited)
690 return hwcdrv_driver;
691 hwcdrv_driver_inited = 1;
692 cpcN_npics = 0;
693 for (int i = 0; i < MAX_PICS; i++)
694 hwctable[i] = &hwcdef[i];
695 hwcdrv_driver = &hwcdrv_pcl_api;
696 hwcdrv_driver->hwcdrv_init_status = hwcdrv_driver->hwcdrv_init (NULL, NULL);
697 if (hwcdrv_driver->hwcdrv_init_status == 0)
698 {
699 hwcdrv_driver->hwcdrv_get_info (NULL, NULL, &cpcN_npics, NULL, NULL);
700 return hwcdrv_driver;
701 }
702 hwcdrv_driver = &hwcdrv_default;
703 return hwcdrv_driver;
704 }
705