1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/7.4/sys/amd64/amd64/nexus.c 212893 2010-09-20 11:09:31Z avg $");
32
33 /*
34 * This code implements a `root nexus' for Intel Architecture
35 * machines. The function of the root nexus is to serve as an
36 * attachment point for both processors and buses, and to manage
37 * resources which are common to all of them. In particular,
38 * this code implements the core resource managers for interrupt
39 * requests, DMA requests (which rightfully should be a part of the
40 * ISA code but it's easier to do it here for now), I/O port addresses,
41 * and I/O memory address space.
42 */
43
44 #include "opt_isa.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/bus.h>
49 #include <sys/kernel.h>
50 #include <sys/linker.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <machine/bus.h>
54 #include <machine/intr_machdep.h>
55 #include <sys/rman.h>
56 #include <sys/interrupt.h>
57
58 #include <machine/vmparam.h>
59 #include <vm/vm.h>
60 #include <vm/pmap.h>
61 #include <machine/pmap.h>
62
63 #include <machine/metadata.h>
64 #include <machine/resource.h>
65 #include <machine/pc/bios.h>
66
67 #include "pcib_if.h"
68
69 #ifdef DEV_ISA
70 #include <isa/isavar.h>
71 #include <amd64/isa/isa.h>
72 #endif
73 #include <sys/rtprio.h>
74
75 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
76 struct nexus_device {
77 struct resource_list nx_resources;
78 };
79
80 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
81
82 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
83
84 static int nexus_probe(device_t);
85 static int nexus_attach(device_t);
86 static int nexus_print_all_resources(device_t dev);
87 static int nexus_print_child(device_t, device_t);
88 static device_t nexus_add_child(device_t bus, u_int order, const char *name,
89 int unit);
90 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
91 u_long, u_long, u_long, u_int);
92 #ifdef SMP
93 static int nexus_bind_intr(device_t, device_t, struct resource *, int);
94 #endif
95 static int nexus_config_intr(device_t, int, enum intr_trigger,
96 enum intr_polarity);
97 static int nexus_describe_intr(device_t dev, device_t child,
98 struct resource *irq, void *cookie,
99 const char *descr);
100 static int nexus_activate_resource(device_t, device_t, int, int,
101 struct resource *);
102 static int nexus_deactivate_resource(device_t, device_t, int, int,
103 struct resource *);
104 static int nexus_release_resource(device_t, device_t, int, int,
105 struct resource *);
106 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
107 driver_filter_t filter, void (*)(void *), void *,
108 void **);
109 static int nexus_teardown_intr(device_t, device_t, struct resource *,
110 void *);
111 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
112 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
113 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
114 static void nexus_delete_resource(device_t, device_t, int, int);
115 static int nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs);
116 static int nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs);
117 static int nexus_alloc_msix(device_t pcib, device_t dev, int *irq);
118 static int nexus_release_msix(device_t pcib, device_t dev, int irq);
119 static int nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data);
120
121 static device_method_t nexus_methods[] = {
122 /* Device interface */
123 DEVMETHOD(device_probe, nexus_probe),
124 DEVMETHOD(device_attach, nexus_attach),
125 DEVMETHOD(device_detach, bus_generic_detach),
126 DEVMETHOD(device_shutdown, bus_generic_shutdown),
127 DEVMETHOD(device_suspend, bus_generic_suspend),
128 DEVMETHOD(device_resume, bus_generic_resume),
129
130 /* Bus interface */
131 DEVMETHOD(bus_print_child, nexus_print_child),
132 DEVMETHOD(bus_add_child, nexus_add_child),
133 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
134 DEVMETHOD(bus_release_resource, nexus_release_resource),
135 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
136 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
137 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
138 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
139 #ifdef SMP
140 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
141 #endif
142 DEVMETHOD(bus_config_intr, nexus_config_intr),
143 DEVMETHOD(bus_describe_intr, nexus_describe_intr),
144 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
145 DEVMETHOD(bus_set_resource, nexus_set_resource),
146 DEVMETHOD(bus_get_resource, nexus_get_resource),
147 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
148
149 /* pcib interface */
150 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi),
151 DEVMETHOD(pcib_release_msi, nexus_release_msi),
152 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix),
153 DEVMETHOD(pcib_release_msix, nexus_release_msix),
154 DEVMETHOD(pcib_map_msi, nexus_map_msi),
155
156 { 0, 0 }
157 };
158
159 static driver_t nexus_driver = {
160 "nexus",
161 nexus_methods,
162 1, /* no softc */
163 };
164 static devclass_t nexus_devclass;
165
166 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
167
168 static int
169 nexus_probe(device_t dev)
170 {
171 int irq;
172
173 device_quiet(dev); /* suppress attach message for neatness */
174
175 /*
176 * XXX working notes:
177 *
178 * - IRQ resource creation should be moved to the PIC/APIC driver.
179 * - DRQ resource creation should be moved to the DMAC driver.
180 * - The above should be sorted to probe earlier than any child busses.
181 *
182 * - Leave I/O and memory creation here, as child probes may need them.
183 * (especially eg. ACPI)
184 */
185
186 /*
187 * IRQ's are on the mainboard on old systems, but on the ISA part
188 * of PCI->ISA bridges. There would be multiple sets of IRQs on
189 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
190 * component, so in a way, PCI can be a partial child of an ISA bus(!).
191 * APIC interrupts are global though.
192 */
193 irq_rman.rm_start = 0;
194 irq_rman.rm_type = RMAN_ARRAY;
195 irq_rman.rm_descr = "Interrupt request lines";
196 irq_rman.rm_end = NUM_IO_INTS - 1;
197 if (rman_init(&irq_rman))
198 panic("nexus_probe irq_rman");
199
200 /*
201 * We search for regions of existing IRQs and add those to the IRQ
202 * resource manager.
203 */
204 for (irq = 0; irq < NUM_IO_INTS; irq++)
205 if (intr_lookup_source(irq) != NULL)
206 if (rman_manage_region(&irq_rman, irq, irq) != 0)
207 panic("nexus_probe irq_rman add");
208
209 /*
210 * ISA DMA on PCI systems is implemented in the ISA part of each
211 * PCI->ISA bridge and the channels can be duplicated if there are
212 * multiple bridges. (eg: laptops with docking stations)
213 */
214 drq_rman.rm_start = 0;
215 drq_rman.rm_end = 7;
216 drq_rman.rm_type = RMAN_ARRAY;
217 drq_rman.rm_descr = "DMA request lines";
218 /* XXX drq 0 not available on some machines */
219 if (rman_init(&drq_rman)
220 || rman_manage_region(&drq_rman,
221 drq_rman.rm_start, drq_rman.rm_end))
222 panic("nexus_probe drq_rman");
223
224 /*
225 * However, IO ports and Memory truely are global at this level,
226 * as are APIC interrupts (however many IO APICS there turn out
227 * to be on large systems..)
228 */
229 port_rman.rm_start = 0;
230 port_rman.rm_end = 0xffff;
231 port_rman.rm_type = RMAN_ARRAY;
232 port_rman.rm_descr = "I/O ports";
233 if (rman_init(&port_rman)
234 || rman_manage_region(&port_rman, 0, 0xffff))
235 panic("nexus_probe port_rman");
236
237 mem_rman.rm_start = 0;
238 mem_rman.rm_end = ~0u;
239 mem_rman.rm_type = RMAN_ARRAY;
240 mem_rman.rm_descr = "I/O memory addresses";
241 if (rman_init(&mem_rman)
242 || rman_manage_region(&mem_rman, 0, ~0))
243 panic("nexus_probe mem_rman");
244
245 return 0;
246 }
247
248 static int
249 nexus_attach(device_t dev)
250 {
251
252 bus_generic_probe(dev);
253 bus_generic_attach(dev);
254 return 0;
255 }
256
257 static int
258 nexus_print_all_resources(device_t dev)
259 {
260 struct nexus_device *ndev = DEVTONX(dev);
261 struct resource_list *rl = &ndev->nx_resources;
262 int retval = 0;
263
264 if (STAILQ_FIRST(rl))
265 retval += printf(" at");
266
267 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
268 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
269 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
270
271 return retval;
272 }
273
274 static int
275 nexus_print_child(device_t bus, device_t child)
276 {
277 int retval = 0;
278
279 retval += bus_print_child_header(bus, child);
280 retval += nexus_print_all_resources(child);
281 if (device_get_flags(child))
282 retval += printf(" flags %#x", device_get_flags(child));
283 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
284
285 return (retval);
286 }
287
288 static device_t
289 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
290 {
291 device_t child;
292 struct nexus_device *ndev;
293
294 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
295 if (!ndev)
296 return(0);
297 resource_list_init(&ndev->nx_resources);
298
299 child = device_add_child_ordered(bus, order, name, unit);
300
301 /* should we free this in nexus_child_detached? */
302 device_set_ivars(child, ndev);
303
304 return(child);
305 }
306
307 /*
308 * Allocate a resource on behalf of child. NB: child is usually going to be a
309 * child of one of our descendants, not a direct child of nexus0.
310 */
311 static struct resource *
312 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
313 u_long start, u_long end, u_long count, u_int flags)
314 {
315 struct nexus_device *ndev = DEVTONX(child);
316 struct resource *rv;
317 struct resource_list_entry *rle;
318 struct rman *rm;
319 int needactivate = flags & RF_ACTIVE;
320
321 /*
322 * If this is an allocation of the "default" range for a given RID, and
323 * we know what the resources for this device are (ie. they aren't maintained
324 * by a child bus), then work out the start/end values.
325 */
326 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
327 if (ndev == NULL)
328 return(NULL);
329 rle = resource_list_find(&ndev->nx_resources, type, *rid);
330 if (rle == NULL)
331 return(NULL);
332 start = rle->start;
333 end = rle->end;
334 count = rle->count;
335 }
336
337 flags &= ~RF_ACTIVE;
338
339 switch (type) {
340 case SYS_RES_IRQ:
341 rm = &irq_rman;
342 break;
343
344 case SYS_RES_DRQ:
345 rm = &drq_rman;
346 break;
347
348 case SYS_RES_IOPORT:
349 rm = &port_rman;
350 break;
351
352 case SYS_RES_MEMORY:
353 rm = &mem_rman;
354 break;
355
356 default:
357 return 0;
358 }
359
360 rv = rman_reserve_resource(rm, start, end, count, flags, child);
361 if (rv == 0)
362 return 0;
363 rman_set_rid(rv, *rid);
364
365 if (needactivate) {
366 if (bus_activate_resource(child, type, *rid, rv)) {
367 rman_release_resource(rv);
368 return 0;
369 }
370 }
371
372 return rv;
373 }
374
375 static int
376 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
377 struct resource *r)
378 {
379
380 /*
381 * If this is a memory resource, map it into the kernel.
382 */
383 if (type == SYS_RES_MEMORY) {
384 void *vaddr;
385
386 vaddr = pmap_mapdev(rman_get_start(r), rman_get_size(r));
387 rman_set_virtual(r, vaddr);
388 rman_set_bustag(r, AMD64_BUS_SPACE_MEM);
389 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
390 } else if (type == SYS_RES_IOPORT) {
391 rman_set_bustag(r, AMD64_BUS_SPACE_IO);
392 rman_set_bushandle(r, rman_get_start(r));
393 }
394 return (rman_activate_resource(r));
395 }
396
397 static int
398 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
399 struct resource *r)
400 {
401 /*
402 * If this is a memory resource, unmap it.
403 */
404 if (type == SYS_RES_MEMORY) {
405 pmap_unmapdev((vm_offset_t)rman_get_virtual(r),
406 rman_get_size(r));
407 }
408
409 return (rman_deactivate_resource(r));
410 }
411
412 static int
413 nexus_release_resource(device_t bus, device_t child, int type, int rid,
414 struct resource *r)
415 {
416 if (rman_get_flags(r) & RF_ACTIVE) {
417 int error = bus_deactivate_resource(child, type, rid, r);
418 if (error)
419 return error;
420 }
421 return (rman_release_resource(r));
422 }
423
424 /*
425 * Currently this uses the really grody interface from kern/kern_intr.c
426 * (which really doesn't belong in kern/anything.c). Eventually, all of
427 * the code in kern_intr.c and machdep_intr.c should get moved here, since
428 * this is going to be the official interface.
429 */
430 static int
431 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
432 int flags, driver_filter_t filter, void (*ihand)(void *),
433 void *arg, void **cookiep)
434 {
435 int error;
436
437 /* somebody tried to setup an irq that failed to allocate! */
438 if (irq == NULL)
439 panic("nexus_setup_intr: NULL irq resource!");
440
441 *cookiep = 0;
442 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
443 flags |= INTR_EXCL;
444
445 /*
446 * We depend here on rman_activate_resource() being idempotent.
447 */
448 error = rman_activate_resource(irq);
449 if (error)
450 return (error);
451
452 error = intr_add_handler(device_get_nameunit(child),
453 rman_get_start(irq), filter, ihand, arg, flags, cookiep);
454
455 return (error);
456 }
457
458 static int
459 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
460 {
461 return (intr_remove_handler(ih));
462 }
463
464 #ifdef SMP
465 static int
466 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
467 {
468 return (intr_bind(rman_get_start(irq), cpu));
469 }
470 #endif
471
472 static int
473 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
474 enum intr_polarity pol)
475 {
476 return (intr_config_intr(irq, trig, pol));
477 }
478
479 static int
480 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
481 void *cookie, const char *descr)
482 {
483
484 return (intr_describe(rman_get_start(irq), cookie, descr));
485 }
486
487 static struct resource_list *
488 nexus_get_reslist(device_t dev, device_t child)
489 {
490 struct nexus_device *ndev = DEVTONX(child);
491
492 return (&ndev->nx_resources);
493 }
494
495 static int
496 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
497 {
498 struct nexus_device *ndev = DEVTONX(child);
499 struct resource_list *rl = &ndev->nx_resources;
500
501 /* XXX this should return a success/failure indicator */
502 resource_list_add(rl, type, rid, start, start + count - 1, count);
503 return(0);
504 }
505
506 static int
507 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
508 {
509 struct nexus_device *ndev = DEVTONX(child);
510 struct resource_list *rl = &ndev->nx_resources;
511 struct resource_list_entry *rle;
512
513 rle = resource_list_find(rl, type, rid);
514 if (!rle)
515 return(ENOENT);
516 if (startp)
517 *startp = rle->start;
518 if (countp)
519 *countp = rle->count;
520 return(0);
521 }
522
523 static void
524 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
525 {
526 struct nexus_device *ndev = DEVTONX(child);
527 struct resource_list *rl = &ndev->nx_resources;
528
529 resource_list_delete(rl, type, rid);
530 }
531
532 /* Called from the MSI code to add new IRQs to the IRQ rman. */
533 void
534 nexus_add_irq(u_long irq)
535 {
536
537 if (rman_manage_region(&irq_rman, irq, irq) != 0)
538 panic("%s: failed", __func__);
539 }
540
541 static int
542 nexus_alloc_msix(device_t pcib, device_t dev, int *irq)
543 {
544
545 return (msix_alloc(dev, irq));
546 }
547
548 static int
549 nexus_release_msix(device_t pcib, device_t dev, int irq)
550 {
551
552 return (msix_release(irq));
553 }
554
555 static int
556 nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
557 {
558
559 return (msi_alloc(dev, count, maxcount, irqs));
560 }
561
562 static int
563 nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
564 {
565
566 return (msi_release(irqs, count));
567 }
568
569 static int
570 nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data)
571 {
572
573 return (msi_map(irq, addr, data));
574 }
575
576 /* Placeholder for system RAM. */
577 static void
578 ram_identify(driver_t *driver, device_t parent)
579 {
580
581 if (resource_disabled("ram", 0))
582 return;
583 if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
584 panic("ram_identify");
585 }
586
587 static int
588 ram_probe(device_t dev)
589 {
590
591 device_quiet(dev);
592 device_set_desc(dev, "System RAM");
593 return (0);
594 }
595
596 static int
597 ram_attach(device_t dev)
598 {
599 struct bios_smap *smapbase, *smap, *smapend;
600 struct resource *res;
601 caddr_t kmdp;
602 uint32_t smapsize;
603 int error, rid;
604
605 /* Retrieve the system memory map from the loader. */
606 kmdp = preload_search_by_type("elf kernel");
607 if (kmdp == NULL)
608 kmdp = preload_search_by_type("elf64 kernel");
609 smapbase = (struct bios_smap *)preload_search_info(kmdp,
610 MODINFO_METADATA | MODINFOMD_SMAP);
611 smapsize = *((u_int32_t *)smapbase - 1);
612 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
613
614 rid = 0;
615 for (smap = smapbase; smap < smapend; smap++) {
616 if (smap->type != SMAP_TYPE_MEMORY || smap->length == 0)
617 continue;
618 error = bus_set_resource(dev, SYS_RES_MEMORY, rid, smap->base,
619 smap->length);
620 if (error)
621 panic("ram_attach: resource %d failed set with %d", rid,
622 error);
623 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
624 if (res == NULL)
625 panic("ram_attach: resource %d failed to attach", rid);
626 rid++;
627 }
628 return (0);
629 }
630
631 static device_method_t ram_methods[] = {
632 /* Device interface */
633 DEVMETHOD(device_identify, ram_identify),
634 DEVMETHOD(device_probe, ram_probe),
635 DEVMETHOD(device_attach, ram_attach),
636 { 0, 0 }
637 };
638
639 static driver_t ram_driver = {
640 "ram",
641 ram_methods,
642 1, /* no softc */
643 };
644
645 static devclass_t ram_devclass;
646
647 DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
648
649 #ifdef DEV_ISA
650 /*
651 * Placeholder which claims PnP 'devices' which describe system
652 * resources.
653 */
654 static struct isa_pnp_id sysresource_ids[] = {
655 { 0x010cd041 /* PNP0c01 */, "System Memory" },
656 { 0x020cd041 /* PNP0c02 */, "System Resource" },
657 { 0 }
658 };
659
660 static int
661 sysresource_probe(device_t dev)
662 {
663 int result;
664
665 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
666 device_quiet(dev);
667 }
668 return(result);
669 }
670
671 static int
672 sysresource_attach(device_t dev)
673 {
674 return(0);
675 }
676
677 static device_method_t sysresource_methods[] = {
678 /* Device interface */
679 DEVMETHOD(device_probe, sysresource_probe),
680 DEVMETHOD(device_attach, sysresource_attach),
681 DEVMETHOD(device_detach, bus_generic_detach),
682 DEVMETHOD(device_shutdown, bus_generic_shutdown),
683 DEVMETHOD(device_suspend, bus_generic_suspend),
684 DEVMETHOD(device_resume, bus_generic_resume),
685 { 0, 0 }
686 };
687
688 static driver_t sysresource_driver = {
689 "sysresource",
690 sysresource_methods,
691 1, /* no softc */
692 };
693
694 static devclass_t sysresource_devclass;
695
696 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
697 #endif /* DEV_ISA */
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