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/7.4/sys/i386/i386/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_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/resource.h>
64
65 #ifdef DEV_APIC
66 #include "pcib_if.h"
67 #endif
68
69 #ifdef DEV_ISA
70 #include <isa/isavar.h>
71 #ifdef PC98
72 #include <pc98/cbus/cbus.h>
73 #else
74 #include <i386/isa/isa.h>
75 #endif
76 #endif
77 #include <sys/rtprio.h>
78
79 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
80 struct nexus_device {
81 struct resource_list nx_resources;
82 };
83
84 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
85
86 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
87
88 static int nexus_probe(device_t);
89 static int nexus_attach(device_t);
90 static int nexus_print_all_resources(device_t dev);
91 static int nexus_print_child(device_t, device_t);
92 static device_t nexus_add_child(device_t bus, u_int order, const char *name,
93 int unit);
94 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
95 u_long, u_long, u_long, u_int);
96 #ifdef SMP
97 static int nexus_bind_intr(device_t, device_t, struct resource *, int);
98 #endif
99 static int nexus_config_intr(device_t, int, enum intr_trigger,
100 enum intr_polarity);
101 static int nexus_describe_intr(device_t dev, device_t child,
102 struct resource *irq, void *cookie,
103 const char *descr);
104 static int nexus_activate_resource(device_t, device_t, int, int,
105 struct resource *);
106 static int nexus_deactivate_resource(device_t, device_t, int, int,
107 struct resource *);
108 static int nexus_release_resource(device_t, device_t, int, int,
109 struct resource *);
110 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
111 driver_filter_t filter, void (*)(void *), void *,
112 void **);
113 static int nexus_teardown_intr(device_t, device_t, struct resource *,
114 void *);
115 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
116 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
117 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
118 static void nexus_delete_resource(device_t, device_t, int, int);
119 #ifdef DEV_APIC
120 static int nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs);
121 static int nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs);
122 static int nexus_alloc_msix(device_t pcib, device_t dev, int *irq);
123 static int nexus_release_msix(device_t pcib, device_t dev, int irq);
124 static int nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data);
125 #endif
126
127 static device_method_t nexus_methods[] = {
128 /* Device interface */
129 DEVMETHOD(device_probe, nexus_probe),
130 DEVMETHOD(device_attach, nexus_attach),
131 DEVMETHOD(device_detach, bus_generic_detach),
132 DEVMETHOD(device_shutdown, bus_generic_shutdown),
133 DEVMETHOD(device_suspend, bus_generic_suspend),
134 DEVMETHOD(device_resume, bus_generic_resume),
135
136 /* Bus interface */
137 DEVMETHOD(bus_print_child, nexus_print_child),
138 DEVMETHOD(bus_add_child, nexus_add_child),
139 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
140 DEVMETHOD(bus_release_resource, nexus_release_resource),
141 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
142 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
143 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
144 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
145 #ifdef SMP
146 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
147 #endif
148 DEVMETHOD(bus_config_intr, nexus_config_intr),
149 DEVMETHOD(bus_describe_intr, nexus_describe_intr),
150 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
151 DEVMETHOD(bus_set_resource, nexus_set_resource),
152 DEVMETHOD(bus_get_resource, nexus_get_resource),
153 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
154
155 /* pcib interface */
156 #ifdef DEV_APIC
157 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi),
158 DEVMETHOD(pcib_release_msi, nexus_release_msi),
159 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix),
160 DEVMETHOD(pcib_release_msix, nexus_release_msix),
161 DEVMETHOD(pcib_map_msi, nexus_map_msi),
162 #endif
163
164 { 0, 0 }
165 };
166
167 static driver_t nexus_driver = {
168 "nexus",
169 nexus_methods,
170 1, /* no softc */
171 };
172 static devclass_t nexus_devclass;
173
174 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
175
176 static int
177 nexus_probe(device_t dev)
178 {
179 int irq;
180
181 device_quiet(dev); /* suppress attach message for neatness */
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_probe 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_probe 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_probe 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_probe 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_probe mem_rman");
256
257 return 0;
258 }
259
260 static int
261 nexus_attach(device_t dev)
262 {
263
264 bus_generic_probe(dev);
265 bus_generic_attach(dev);
266 return 0;
267 }
268
269 static int
270 nexus_print_all_resources(device_t dev)
271 {
272 struct nexus_device *ndev = DEVTONX(dev);
273 struct resource_list *rl = &ndev->nx_resources;
274 int retval = 0;
275
276 if (STAILQ_FIRST(rl))
277 retval += printf(" at");
278
279 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
280 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
281 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
282
283 return retval;
284 }
285
286 static int
287 nexus_print_child(device_t bus, device_t child)
288 {
289 int retval = 0;
290
291 retval += bus_print_child_header(bus, child);
292 retval += nexus_print_all_resources(child);
293 if (device_get_flags(child))
294 retval += printf(" flags %#x", device_get_flags(child));
295 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
296
297 return (retval);
298 }
299
300 static device_t
301 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
302 {
303 device_t child;
304 struct nexus_device *ndev;
305
306 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
307 if (!ndev)
308 return(0);
309 resource_list_init(&ndev->nx_resources);
310
311 child = device_add_child_ordered(bus, order, name, unit);
312
313 /* should we free this in nexus_child_detached? */
314 device_set_ivars(child, ndev);
315
316 return(child);
317 }
318
319 /*
320 * Allocate a resource on behalf of child. NB: child is usually going to be a
321 * child of one of our descendants, not a direct child of nexus0.
322 * (Exceptions include npx.)
323 */
324 static struct resource *
325 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
326 u_long start, u_long end, u_long count, u_int flags)
327 {
328 struct nexus_device *ndev = DEVTONX(child);
329 struct resource *rv;
330 struct resource_list_entry *rle;
331 struct rman *rm;
332 int needactivate = flags & RF_ACTIVE;
333
334 /*
335 * If this is an allocation of the "default" range for a given RID, and
336 * we know what the resources for this device are (ie. they aren't maintained
337 * by a child bus), then work out the start/end values.
338 */
339 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
340 if (ndev == NULL)
341 return(NULL);
342 rle = resource_list_find(&ndev->nx_resources, type, *rid);
343 if (rle == NULL)
344 return(NULL);
345 start = rle->start;
346 end = rle->end;
347 count = rle->count;
348 }
349
350 flags &= ~RF_ACTIVE;
351
352 switch (type) {
353 case SYS_RES_IRQ:
354 rm = &irq_rman;
355 break;
356
357 case SYS_RES_DRQ:
358 rm = &drq_rman;
359 break;
360
361 case SYS_RES_IOPORT:
362 rm = &port_rman;
363 break;
364
365 case SYS_RES_MEMORY:
366 rm = &mem_rman;
367 break;
368
369 default:
370 return 0;
371 }
372
373 rv = rman_reserve_resource(rm, start, end, count, flags, child);
374 if (rv == 0)
375 return 0;
376 rman_set_rid(rv, *rid);
377
378 if (needactivate) {
379 if (bus_activate_resource(child, type, *rid, rv)) {
380 rman_release_resource(rv);
381 return 0;
382 }
383 }
384
385 return rv;
386 }
387
388 static int
389 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
390 struct resource *r)
391 {
392 #ifdef PC98
393 bus_space_handle_t bh;
394 int error;
395 #endif
396 void *vaddr;
397
398 /*
399 * If this is a memory resource, map it into the kernel.
400 */
401 switch (type) {
402 case SYS_RES_IOPORT:
403 #ifdef PC98
404 error = i386_bus_space_handle_alloc(I386_BUS_SPACE_IO,
405 rman_get_start(r), rman_get_size(r), &bh);
406 if (error)
407 return (error);
408 rman_set_bushandle(r, bh);
409 #else
410 rman_set_bushandle(r, rman_get_start(r));
411 #endif
412 rman_set_bustag(r, I386_BUS_SPACE_IO);
413 break;
414 case SYS_RES_MEMORY:
415 #ifdef PC98
416 error = i386_bus_space_handle_alloc(I386_BUS_SPACE_MEM,
417 rman_get_start(r), rman_get_size(r), &bh);
418 if (error)
419 return (error);
420 #endif
421 vaddr = pmap_mapdev(rman_get_start(r), rman_get_size(r));
422 rman_set_virtual(r, vaddr);
423 rman_set_bustag(r, I386_BUS_SPACE_MEM);
424 #ifdef PC98
425 /* PC-98: the type of bus_space_handle_t is the structure. */
426 bh->bsh_base = (bus_addr_t) vaddr;
427 rman_set_bushandle(r, bh);
428 #else
429 /* IBM-PC: the type of bus_space_handle_t is u_int */
430 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
431 #endif
432 }
433 return (rman_activate_resource(r));
434 }
435
436 static int
437 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
438 struct resource *r)
439 {
440
441 /*
442 * If this is a memory resource, unmap it.
443 */
444 if (type == SYS_RES_MEMORY) {
445 pmap_unmapdev((vm_offset_t)rman_get_virtual(r),
446 rman_get_size(r));
447 }
448 #ifdef PC98
449 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
450 bus_space_handle_t bh;
451
452 bh = rman_get_bushandle(r);
453 i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz);
454 }
455 #endif
456 return (rman_deactivate_resource(r));
457 }
458
459 static int
460 nexus_release_resource(device_t bus, device_t child, int type, int rid,
461 struct resource *r)
462 {
463 if (rman_get_flags(r) & RF_ACTIVE) {
464 int error = bus_deactivate_resource(child, type, rid, r);
465 if (error)
466 return error;
467 }
468 return (rman_release_resource(r));
469 }
470
471 /*
472 * Currently this uses the really grody interface from kern/kern_intr.c
473 * (which really doesn't belong in kern/anything.c). Eventually, all of
474 * the code in kern_intr.c and machdep_intr.c should get moved here, since
475 * this is going to be the official interface.
476 */
477 static int
478 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
479 int flags, driver_filter_t filter, void (*ihand)(void *),
480 void *arg, void **cookiep)
481 {
482 int error;
483
484 /* somebody tried to setup an irq that failed to allocate! */
485 if (irq == NULL)
486 panic("nexus_setup_intr: NULL irq resource!");
487
488 *cookiep = 0;
489 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
490 flags |= INTR_EXCL;
491
492 /*
493 * We depend here on rman_activate_resource() being idempotent.
494 */
495 error = rman_activate_resource(irq);
496 if (error)
497 return (error);
498
499 error = intr_add_handler(device_get_nameunit(child),
500 rman_get_start(irq), filter, ihand, arg, flags, cookiep);
501
502 return (error);
503 }
504
505 static int
506 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
507 {
508 return (intr_remove_handler(ih));
509 }
510
511 #ifdef SMP
512 static int
513 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
514 {
515 return (intr_bind(rman_get_start(irq), cpu));
516 }
517 #endif
518
519 static int
520 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
521 enum intr_polarity pol)
522 {
523 return (intr_config_intr(irq, trig, pol));
524 }
525
526 static int
527 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
528 void *cookie, const char *descr)
529 {
530
531 return (intr_describe(rman_get_start(irq), cookie, descr));
532 }
533
534 static struct resource_list *
535 nexus_get_reslist(device_t dev, device_t child)
536 {
537 struct nexus_device *ndev = DEVTONX(child);
538
539 return (&ndev->nx_resources);
540 }
541
542 static int
543 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
544 {
545 struct nexus_device *ndev = DEVTONX(child);
546 struct resource_list *rl = &ndev->nx_resources;
547
548 /* XXX this should return a success/failure indicator */
549 resource_list_add(rl, type, rid, start, start + count - 1, count);
550 return(0);
551 }
552
553 static int
554 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
555 {
556 struct nexus_device *ndev = DEVTONX(child);
557 struct resource_list *rl = &ndev->nx_resources;
558 struct resource_list_entry *rle;
559
560 rle = resource_list_find(rl, type, rid);
561 if (!rle)
562 return(ENOENT);
563 if (startp)
564 *startp = rle->start;
565 if (countp)
566 *countp = rle->count;
567 return(0);
568 }
569
570 static void
571 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
572 {
573 struct nexus_device *ndev = DEVTONX(child);
574 struct resource_list *rl = &ndev->nx_resources;
575
576 resource_list_delete(rl, type, rid);
577 }
578
579 /* Called from the MSI code to add new IRQs to the IRQ rman. */
580 void
581 nexus_add_irq(u_long irq)
582 {
583
584 if (rman_manage_region(&irq_rman, irq, irq) != 0)
585 panic("%s: failed", __func__);
586 }
587
588 #ifdef DEV_APIC
589 static int
590 nexus_alloc_msix(device_t pcib, device_t dev, int *irq)
591 {
592
593 return (msix_alloc(dev, irq));
594 }
595
596 static int
597 nexus_release_msix(device_t pcib, device_t dev, int irq)
598 {
599
600 return (msix_release(irq));
601 }
602
603 static int
604 nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
605 {
606
607 return (msi_alloc(dev, count, maxcount, irqs));
608 }
609
610 static int
611 nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
612 {
613
614 return (msi_release(irqs, count));
615 }
616
617 static int
618 nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data)
619 {
620
621 return (msi_map(irq, addr, data));
622 }
623 #endif
624
625 /* Placeholder for system RAM. */
626 static void
627 ram_identify(driver_t *driver, device_t parent)
628 {
629
630 if (resource_disabled("ram", 0))
631 return;
632 if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
633 panic("ram_identify");
634 }
635
636 static int
637 ram_probe(device_t dev)
638 {
639
640 device_quiet(dev);
641 device_set_desc(dev, "System RAM");
642 return (0);
643 }
644
645 static int
646 ram_attach(device_t dev)
647 {
648 struct resource *res;
649 vm_paddr_t *p;
650 int error, i, rid;
651
652 /*
653 * We use the dump_avail[] array rather than phys_avail[] for
654 * the memory map as phys_avail[] contains holes for kernel
655 * memory, page 0, the message buffer, and the dcons buffer.
656 * We test the end address in the loop instead of the start
657 * since the start address for the first segment is 0.
658 *
659 * XXX: It would be preferable to use the SMAP if it exists
660 * instead since if the SMAP is very fragmented we may not
661 * include some memory regions in dump_avail[] and phys_avail[].
662 */
663 for (i = 0, p = dump_avail; p[1] != 0; i++, p += 2) {
664 rid = i;
665 #ifdef PAE
666 /*
667 * Resources use long's to track resources, so we can't
668 * include memory regions above 4GB.
669 */
670 if (p[0] >= ~0ul)
671 break;
672 #endif
673 error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0],
674 p[1] - p[0]);
675 if (error)
676 panic("ram_attach: resource %d failed set with %d", i,
677 error);
678 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
679 if (res == NULL)
680 panic("ram_attach: resource %d failed to attach", i);
681 }
682 return (0);
683 }
684
685 static device_method_t ram_methods[] = {
686 /* Device interface */
687 DEVMETHOD(device_identify, ram_identify),
688 DEVMETHOD(device_probe, ram_probe),
689 DEVMETHOD(device_attach, ram_attach),
690 { 0, 0 }
691 };
692
693 static driver_t ram_driver = {
694 "ram",
695 ram_methods,
696 1, /* no softc */
697 };
698
699 static devclass_t ram_devclass;
700
701 DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
702
703 #ifdef DEV_ISA
704 /*
705 * Placeholder which claims PnP 'devices' which describe system
706 * resources.
707 */
708 static struct isa_pnp_id sysresource_ids[] = {
709 { 0x010cd041 /* PNP0c01 */, "System Memory" },
710 { 0x020cd041 /* PNP0c02 */, "System Resource" },
711 { 0 }
712 };
713
714 static int
715 sysresource_probe(device_t dev)
716 {
717 int result;
718
719 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
720 device_quiet(dev);
721 }
722 return(result);
723 }
724
725 static int
726 sysresource_attach(device_t dev)
727 {
728 return(0);
729 }
730
731 static device_method_t sysresource_methods[] = {
732 /* Device interface */
733 DEVMETHOD(device_probe, sysresource_probe),
734 DEVMETHOD(device_attach, sysresource_attach),
735 DEVMETHOD(device_detach, bus_generic_detach),
736 DEVMETHOD(device_shutdown, bus_generic_shutdown),
737 DEVMETHOD(device_suspend, bus_generic_suspend),
738 DEVMETHOD(device_resume, bus_generic_resume),
739 { 0, 0 }
740 };
741
742 static driver_t sysresource_driver = {
743 "sysresource",
744 sysresource_methods,
745 1, /* no softc */
746 };
747
748 static devclass_t sysresource_devclass;
749
750 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
751 #endif /* DEV_ISA */
Cache object: df699b6431b1edc5bb963549afcf8a7a
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