FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/nexus.c
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/8.1/sys/i386/i386/nexus.c 202762 2010-01-21 17:54:29Z jhb $");
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_apic.h"
45 #include "opt_isa.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/bus.h>
50 #include <sys/kernel.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/nexusvar.h>
64 #include <machine/resource.h>
65
66 #ifdef DEV_APIC
67 #include "pcib_if.h"
68 #endif
69
70 #ifdef DEV_ISA
71 #include <isa/isavar.h>
72 #ifdef PC98
73 #include <pc98/cbus/cbus.h>
74 #else
75 #include <i386/isa/isa.h>
76 #endif
77 #endif
78 #include <sys/rtprio.h>
79
80 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
81
82 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
83
84 struct rman irq_rman, drq_rman, port_rman, mem_rman;
85
86 static int nexus_probe(device_t);
87 static int nexus_attach(device_t);
88 static int nexus_print_all_resources(device_t dev);
89 static int nexus_print_child(device_t, device_t);
90 static device_t nexus_add_child(device_t bus, int order, const char *name,
91 int unit);
92 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
93 u_long, u_long, u_long, u_int);
94 #ifdef SMP
95 static int nexus_bind_intr(device_t, device_t, struct resource *, int);
96 #endif
97 static int nexus_config_intr(device_t, int, enum intr_trigger,
98 enum intr_polarity);
99 static int nexus_describe_intr(device_t dev, device_t child,
100 struct resource *irq, void *cookie,
101 const char *descr);
102 static int nexus_activate_resource(device_t, device_t, int, int,
103 struct resource *);
104 static int nexus_deactivate_resource(device_t, device_t, int, int,
105 struct resource *);
106 static int nexus_release_resource(device_t, device_t, int, int,
107 struct resource *);
108 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
109 driver_filter_t filter, void (*)(void *), void *,
110 void **);
111 static int nexus_teardown_intr(device_t, device_t, struct resource *,
112 void *);
113 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
114 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
115 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
116 static void nexus_delete_resource(device_t, device_t, int, int);
117 #ifdef DEV_APIC
118 static int nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs);
119 static int nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs);
120 static int nexus_alloc_msix(device_t pcib, device_t dev, int *irq);
121 static int nexus_release_msix(device_t pcib, device_t dev, int irq);
122 static int nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data);
123 #endif
124
125 static device_method_t nexus_methods[] = {
126 /* Device interface */
127 DEVMETHOD(device_probe, nexus_probe),
128 DEVMETHOD(device_attach, nexus_attach),
129 DEVMETHOD(device_detach, bus_generic_detach),
130 DEVMETHOD(device_shutdown, bus_generic_shutdown),
131 DEVMETHOD(device_suspend, bus_generic_suspend),
132 DEVMETHOD(device_resume, bus_generic_resume),
133
134 /* Bus interface */
135 DEVMETHOD(bus_print_child, nexus_print_child),
136 DEVMETHOD(bus_add_child, nexus_add_child),
137 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
138 DEVMETHOD(bus_release_resource, nexus_release_resource),
139 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
140 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
141 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
142 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
143 #ifdef SMP
144 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
145 #endif
146 DEVMETHOD(bus_config_intr, nexus_config_intr),
147 DEVMETHOD(bus_describe_intr, nexus_describe_intr),
148 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
149 DEVMETHOD(bus_set_resource, nexus_set_resource),
150 DEVMETHOD(bus_get_resource, nexus_get_resource),
151 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
152
153 /* pcib interface */
154 #ifdef DEV_APIC
155 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi),
156 DEVMETHOD(pcib_release_msi, nexus_release_msi),
157 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix),
158 DEVMETHOD(pcib_release_msix, nexus_release_msix),
159 DEVMETHOD(pcib_map_msi, nexus_map_msi),
160 #endif
161
162 { 0, 0 }
163 };
164
165 DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1);
166 static devclass_t nexus_devclass;
167
168 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
169
170 static int
171 nexus_probe(device_t dev)
172 {
173
174 device_quiet(dev); /* suppress attach message for neatness */
175 return (BUS_PROBE_GENERIC);
176 }
177
178 void
179 nexus_init_resources(void)
180 {
181 int irq;
182
183 /*
184 * XXX working notes:
185 *
186 * - IRQ resource creation should be moved to the PIC/APIC driver.
187 * - DRQ resource creation should be moved to the DMAC driver.
188 * - The above should be sorted to probe earlier than any child busses.
189 *
190 * - Leave I/O and memory creation here, as child probes may need them.
191 * (especially eg. ACPI)
192 */
193
194 /*
195 * IRQ's are on the mainboard on old systems, but on the ISA part
196 * of PCI->ISA bridges. There would be multiple sets of IRQs on
197 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
198 * component, so in a way, PCI can be a partial child of an ISA bus(!).
199 * APIC interrupts are global though.
200 */
201 irq_rman.rm_start = 0;
202 irq_rman.rm_type = RMAN_ARRAY;
203 irq_rman.rm_descr = "Interrupt request lines";
204 irq_rman.rm_end = NUM_IO_INTS - 1;
205 if (rman_init(&irq_rman))
206 panic("nexus_init_resources irq_rman");
207
208 /*
209 * We search for regions of existing IRQs and add those to the IRQ
210 * resource manager.
211 */
212 for (irq = 0; irq < NUM_IO_INTS; irq++)
213 if (intr_lookup_source(irq) != NULL)
214 if (rman_manage_region(&irq_rman, irq, irq) != 0)
215 panic("nexus_init_resources irq_rman add");
216
217 /*
218 * ISA DMA on PCI systems is implemented in the ISA part of each
219 * PCI->ISA bridge and the channels can be duplicated if there are
220 * multiple bridges. (eg: laptops with docking stations)
221 */
222 drq_rman.rm_start = 0;
223 #ifdef PC98
224 drq_rman.rm_end = 3;
225 #else
226 drq_rman.rm_end = 7;
227 #endif
228 drq_rman.rm_type = RMAN_ARRAY;
229 drq_rman.rm_descr = "DMA request lines";
230 /* XXX drq 0 not available on some machines */
231 if (rman_init(&drq_rman)
232 || rman_manage_region(&drq_rman,
233 drq_rman.rm_start, drq_rman.rm_end))
234 panic("nexus_init_resources drq_rman");
235
236 /*
237 * However, IO ports and Memory truely are global at this level,
238 * as are APIC interrupts (however many IO APICS there turn out
239 * to be on large systems..)
240 */
241 port_rman.rm_start = 0;
242 port_rman.rm_end = 0xffff;
243 port_rman.rm_type = RMAN_ARRAY;
244 port_rman.rm_descr = "I/O ports";
245 if (rman_init(&port_rman)
246 || rman_manage_region(&port_rman, 0, 0xffff))
247 panic("nexus_init_resources port_rman");
248
249 mem_rman.rm_start = 0;
250 mem_rman.rm_end = ~0u;
251 mem_rman.rm_type = RMAN_ARRAY;
252 mem_rman.rm_descr = "I/O memory addresses";
253 if (rman_init(&mem_rman)
254 || rman_manage_region(&mem_rman, 0, ~0))
255 panic("nexus_init_resources mem_rman");
256 }
257
258 static int
259 nexus_attach(device_t dev)
260 {
261
262 nexus_init_resources();
263 bus_generic_probe(dev);
264
265 /*
266 * Explicitly add the legacy0 device here. Other platform
267 * types (such as ACPI), use their own nexus(4) subclass
268 * driver to override this routine and add their own root bus.
269 */
270 if (BUS_ADD_CHILD(dev, 10, "legacy", 0) == NULL)
271 panic("legacy: could not attach");
272 bus_generic_attach(dev);
273 return 0;
274 }
275
276 static int
277 nexus_print_all_resources(device_t dev)
278 {
279 struct nexus_device *ndev = DEVTONX(dev);
280 struct resource_list *rl = &ndev->nx_resources;
281 int retval = 0;
282
283 if (STAILQ_FIRST(rl))
284 retval += printf(" at");
285
286 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
287 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
288 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
289
290 return retval;
291 }
292
293 static int
294 nexus_print_child(device_t bus, device_t child)
295 {
296 int retval = 0;
297
298 retval += bus_print_child_header(bus, child);
299 retval += nexus_print_all_resources(child);
300 if (device_get_flags(child))
301 retval += printf(" flags %#x", device_get_flags(child));
302 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
303
304 return (retval);
305 }
306
307 static device_t
308 nexus_add_child(device_t bus, int order, const char *name, int unit)
309 {
310 device_t child;
311 struct nexus_device *ndev;
312
313 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
314 if (!ndev)
315 return(0);
316 resource_list_init(&ndev->nx_resources);
317
318 child = device_add_child_ordered(bus, order, name, unit);
319
320 /* should we free this in nexus_child_detached? */
321 device_set_ivars(child, ndev);
322
323 return(child);
324 }
325
326 /*
327 * Allocate a resource on behalf of child. NB: child is usually going to be a
328 * child of one of our descendants, not a direct child of nexus0.
329 * (Exceptions include npx.)
330 */
331 static struct resource *
332 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
333 u_long start, u_long end, u_long count, u_int flags)
334 {
335 struct nexus_device *ndev = DEVTONX(child);
336 struct resource *rv;
337 struct resource_list_entry *rle;
338 struct rman *rm;
339 int needactivate = flags & RF_ACTIVE;
340
341 /*
342 * If this is an allocation of the "default" range for a given RID, and
343 * we know what the resources for this device are (ie. they aren't maintained
344 * by a child bus), then work out the start/end values.
345 */
346 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
347 if (ndev == NULL)
348 return(NULL);
349 rle = resource_list_find(&ndev->nx_resources, type, *rid);
350 if (rle == NULL)
351 return(NULL);
352 start = rle->start;
353 end = rle->end;
354 count = rle->count;
355 }
356
357 flags &= ~RF_ACTIVE;
358
359 switch (type) {
360 case SYS_RES_IRQ:
361 rm = &irq_rman;
362 break;
363
364 case SYS_RES_DRQ:
365 rm = &drq_rman;
366 break;
367
368 case SYS_RES_IOPORT:
369 rm = &port_rman;
370 break;
371
372 case SYS_RES_MEMORY:
373 rm = &mem_rman;
374 break;
375
376 default:
377 return 0;
378 }
379
380 rv = rman_reserve_resource(rm, start, end, count, flags, child);
381 if (rv == 0)
382 return 0;
383 rman_set_rid(rv, *rid);
384
385 if (needactivate) {
386 if (bus_activate_resource(child, type, *rid, rv)) {
387 rman_release_resource(rv);
388 return 0;
389 }
390 }
391
392 return rv;
393 }
394
395 static int
396 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
397 struct resource *r)
398 {
399 #ifdef PC98
400 bus_space_handle_t bh;
401 int error;
402 #endif
403 void *vaddr;
404
405 /*
406 * If this is a memory resource, map it into the kernel.
407 */
408 switch (type) {
409 case SYS_RES_IOPORT:
410 #ifdef PC98
411 error = i386_bus_space_handle_alloc(I386_BUS_SPACE_IO,
412 rman_get_start(r), rman_get_size(r), &bh);
413 if (error)
414 return (error);
415 rman_set_bushandle(r, bh);
416 #else
417 rman_set_bushandle(r, rman_get_start(r));
418 #endif
419 rman_set_bustag(r, I386_BUS_SPACE_IO);
420 break;
421 case SYS_RES_MEMORY:
422 #ifdef PC98
423 error = i386_bus_space_handle_alloc(I386_BUS_SPACE_MEM,
424 rman_get_start(r), rman_get_size(r), &bh);
425 if (error)
426 return (error);
427 #endif
428 vaddr = pmap_mapdev(rman_get_start(r), rman_get_size(r));
429 rman_set_virtual(r, vaddr);
430 rman_set_bustag(r, I386_BUS_SPACE_MEM);
431 #ifdef PC98
432 /* PC-98: the type of bus_space_handle_t is the structure. */
433 bh->bsh_base = (bus_addr_t) vaddr;
434 rman_set_bushandle(r, bh);
435 #else
436 /* IBM-PC: the type of bus_space_handle_t is u_int */
437 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
438 #endif
439 }
440 return (rman_activate_resource(r));
441 }
442
443 static int
444 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
445 struct resource *r)
446 {
447
448 /*
449 * If this is a memory resource, unmap it.
450 */
451 if (type == SYS_RES_MEMORY) {
452 pmap_unmapdev((vm_offset_t)rman_get_virtual(r),
453 rman_get_size(r));
454 }
455 #ifdef PC98
456 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
457 bus_space_handle_t bh;
458
459 bh = rman_get_bushandle(r);
460 i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz);
461 }
462 #endif
463 return (rman_deactivate_resource(r));
464 }
465
466 static int
467 nexus_release_resource(device_t bus, device_t child, int type, int rid,
468 struct resource *r)
469 {
470 if (rman_get_flags(r) & RF_ACTIVE) {
471 int error = bus_deactivate_resource(child, type, rid, r);
472 if (error)
473 return error;
474 }
475 return (rman_release_resource(r));
476 }
477
478 /*
479 * Currently this uses the really grody interface from kern/kern_intr.c
480 * (which really doesn't belong in kern/anything.c). Eventually, all of
481 * the code in kern_intr.c and machdep_intr.c should get moved here, since
482 * this is going to be the official interface.
483 */
484 static int
485 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
486 int flags, driver_filter_t filter, void (*ihand)(void *),
487 void *arg, void **cookiep)
488 {
489 int error;
490
491 /* somebody tried to setup an irq that failed to allocate! */
492 if (irq == NULL)
493 panic("nexus_setup_intr: NULL irq resource!");
494
495 *cookiep = 0;
496 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
497 flags |= INTR_EXCL;
498
499 /*
500 * We depend here on rman_activate_resource() being idempotent.
501 */
502 error = rman_activate_resource(irq);
503 if (error)
504 return (error);
505
506 error = intr_add_handler(device_get_nameunit(child),
507 rman_get_start(irq), filter, ihand, arg, flags, cookiep);
508
509 return (error);
510 }
511
512 static int
513 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
514 {
515 return (intr_remove_handler(ih));
516 }
517
518 #ifdef SMP
519 static int
520 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
521 {
522 return (intr_bind(rman_get_start(irq), cpu));
523 }
524 #endif
525
526 static int
527 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
528 enum intr_polarity pol)
529 {
530 return (intr_config_intr(irq, trig, pol));
531 }
532
533 static int
534 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
535 void *cookie, const char *descr)
536 {
537
538 return (intr_describe(rman_get_start(irq), cookie, descr));
539 }
540
541 static struct resource_list *
542 nexus_get_reslist(device_t dev, device_t child)
543 {
544 struct nexus_device *ndev = DEVTONX(child);
545
546 return (&ndev->nx_resources);
547 }
548
549 static int
550 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
551 {
552 struct nexus_device *ndev = DEVTONX(child);
553 struct resource_list *rl = &ndev->nx_resources;
554
555 /* XXX this should return a success/failure indicator */
556 resource_list_add(rl, type, rid, start, start + count - 1, count);
557 return(0);
558 }
559
560 static int
561 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
562 {
563 struct nexus_device *ndev = DEVTONX(child);
564 struct resource_list *rl = &ndev->nx_resources;
565 struct resource_list_entry *rle;
566
567 rle = resource_list_find(rl, type, rid);
568 if (!rle)
569 return(ENOENT);
570 if (startp)
571 *startp = rle->start;
572 if (countp)
573 *countp = rle->count;
574 return(0);
575 }
576
577 static void
578 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
579 {
580 struct nexus_device *ndev = DEVTONX(child);
581 struct resource_list *rl = &ndev->nx_resources;
582
583 resource_list_delete(rl, type, rid);
584 }
585
586 /* Called from the MSI code to add new IRQs to the IRQ rman. */
587 void
588 nexus_add_irq(u_long irq)
589 {
590
591 if (rman_manage_region(&irq_rman, irq, irq) != 0)
592 panic("%s: failed", __func__);
593 }
594
595 #ifdef DEV_APIC
596 static int
597 nexus_alloc_msix(device_t pcib, device_t dev, int *irq)
598 {
599
600 return (msix_alloc(dev, irq));
601 }
602
603 static int
604 nexus_release_msix(device_t pcib, device_t dev, int irq)
605 {
606
607 return (msix_release(irq));
608 }
609
610 static int
611 nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
612 {
613
614 return (msi_alloc(dev, count, maxcount, irqs));
615 }
616
617 static int
618 nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
619 {
620
621 return (msi_release(irqs, count));
622 }
623
624 static int
625 nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data)
626 {
627
628 return (msi_map(irq, addr, data));
629 }
630 #endif
631
632 /* Placeholder for system RAM. */
633 static void
634 ram_identify(driver_t *driver, device_t parent)
635 {
636
637 if (resource_disabled("ram", 0))
638 return;
639 if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
640 panic("ram_identify");
641 }
642
643 static int
644 ram_probe(device_t dev)
645 {
646
647 device_quiet(dev);
648 device_set_desc(dev, "System RAM");
649 return (0);
650 }
651
652 static int
653 ram_attach(device_t dev)
654 {
655 struct resource *res;
656 vm_paddr_t *p;
657 int error, i, rid;
658
659 /*
660 * We use the dump_avail[] array rather than phys_avail[] for
661 * the memory map as phys_avail[] contains holes for kernel
662 * memory, page 0, the message buffer, and the dcons buffer.
663 * We test the end address in the loop instead of the start
664 * since the start address for the first segment is 0.
665 *
666 * XXX: It would be preferable to use the SMAP if it exists
667 * instead since if the SMAP is very fragmented we may not
668 * include some memory regions in dump_avail[] and phys_avail[].
669 */
670 for (i = 0, p = dump_avail; p[1] != 0; i++, p += 2) {
671 rid = i;
672 #ifdef PAE
673 /*
674 * Resources use long's to track resources, so we can't
675 * include memory regions above 4GB.
676 */
677 if (p[0] >= ~0ul)
678 break;
679 #endif
680 error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0],
681 p[1] - p[0]);
682 if (error)
683 panic("ram_attach: resource %d failed set with %d", i,
684 error);
685 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
686 if (res == NULL)
687 panic("ram_attach: resource %d failed to attach", i);
688 }
689 return (0);
690 }
691
692 static device_method_t ram_methods[] = {
693 /* Device interface */
694 DEVMETHOD(device_identify, ram_identify),
695 DEVMETHOD(device_probe, ram_probe),
696 DEVMETHOD(device_attach, ram_attach),
697 { 0, 0 }
698 };
699
700 static driver_t ram_driver = {
701 "ram",
702 ram_methods,
703 1, /* no softc */
704 };
705
706 static devclass_t ram_devclass;
707
708 DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
709
710 #ifdef DEV_ISA
711 /*
712 * Placeholder which claims PnP 'devices' which describe system
713 * resources.
714 */
715 static struct isa_pnp_id sysresource_ids[] = {
716 { 0x010cd041 /* PNP0c01 */, "System Memory" },
717 { 0x020cd041 /* PNP0c02 */, "System Resource" },
718 { 0 }
719 };
720
721 static int
722 sysresource_probe(device_t dev)
723 {
724 int result;
725
726 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
727 device_quiet(dev);
728 }
729 return(result);
730 }
731
732 static int
733 sysresource_attach(device_t dev)
734 {
735 return(0);
736 }
737
738 static device_method_t sysresource_methods[] = {
739 /* Device interface */
740 DEVMETHOD(device_probe, sysresource_probe),
741 DEVMETHOD(device_attach, sysresource_attach),
742 DEVMETHOD(device_detach, bus_generic_detach),
743 DEVMETHOD(device_shutdown, bus_generic_shutdown),
744 DEVMETHOD(device_suspend, bus_generic_suspend),
745 DEVMETHOD(device_resume, bus_generic_resume),
746 { 0, 0 }
747 };
748
749 static driver_t sysresource_driver = {
750 "sysresource",
751 sysresource_methods,
752 1, /* no softc */
753 };
754
755 static devclass_t sysresource_devclass;
756
757 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
758 #endif /* DEV_ISA */
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