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/*
32 * This code implements a `root nexus' for Intel Architecture
33 * machines.  The function of the root nexus is to serve as an
34 * attachment point for both processors and buses, and to manage
35 * resources which are common to all of them.  In particular,
36 * this code implements the core resource managers for interrupt
37 * requests, DMA requests (which rightfully should be a part of the
38 * ISA code but it's easier to do it here for now), I/O port addresses,
39 * and I/O memory address space.
40 */
41
42#ifdef __amd64__
43#define	DEV_APIC
44#else
45#include "opt_apic.h"
46#endif
47#include "opt_isa.h"
48#include "opt_pci.h"
49
50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/bus.h>
53#include <sys/interrupt.h>
54#include <sys/kernel.h>
55#include <sys/linker.h>
56#include <sys/malloc.h>
57#include <sys/module.h>
58#include <sys/rman.h>
59
60#include <vm/vm.h>
61#include <vm/vm_param.h>
62#include <vm/vm_page.h>
63#include <vm/vm_phys.h>
64#include <vm/vm_dumpset.h>
65#include <vm/pmap.h>
66
67#include <machine/bus.h>
68#include <machine/intr_machdep.h>
69#include <machine/md_var.h>
70#include <machine/metadata.h>
71#include <machine/nexusvar.h>
72#include <machine/pc/bios.h>
73#include <machine/resource.h>
74
75#ifdef DEV_APIC
76#include "pcib_if.h"
77#endif
78
79#ifdef DEV_ISA
80#include <isa/isavar.h>
81#include <isa/isareg.h>
82#endif
83
84#define	ELF_KERN_STR	("elf"__XSTRING(__ELF_WORD_SIZE)" kernel")
85
86static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
87
88#define DEVTONX(dev)	((struct nexus_device *)device_get_ivars(dev))
89
90struct rman irq_rman, drq_rman, port_rman, mem_rman;
91
92static int nexus_print_all_resources(device_t dev);
93
94static device_probe_t		nexus_probe;
95static device_attach_t		nexus_attach;
96
97static bus_add_child_t		nexus_add_child;
98static bus_print_child_t	nexus_print_child;
99
100static bus_alloc_resource_t	nexus_alloc_resource;
101static bus_get_resource_list_t	nexus_get_reslist;
102static bus_get_rman_t		nexus_get_rman;
103static bus_map_resource_t	nexus_map_resource;
104static bus_unmap_resource_t	nexus_unmap_resource;
105
106#ifdef SMP
107static bus_bind_intr_t		nexus_bind_intr;
108#endif
109static bus_config_intr_t	nexus_config_intr;
110static bus_describe_intr_t	nexus_describe_intr;
111static bus_resume_intr_t	nexus_resume_intr;
112static bus_setup_intr_t		nexus_setup_intr;
113static bus_suspend_intr_t	nexus_suspend_intr;
114static bus_teardown_intr_t	nexus_teardown_intr;
115
116static bus_get_cpus_t		nexus_get_cpus;
117
118#if defined(DEV_APIC) && defined(DEV_PCI)
119static pcib_alloc_msi_t		nexus_alloc_msi;
120static pcib_release_msi_t	nexus_release_msi;
121static pcib_alloc_msix_t	nexus_alloc_msix;
122static pcib_release_msix_t	nexus_release_msix;
123static pcib_map_msi_t		nexus_map_msi;
124#endif
125
126static device_method_t nexus_methods[] = {
127	/* Device interface */
128	DEVMETHOD(device_probe,		nexus_probe),
129	DEVMETHOD(device_attach,	nexus_attach),
130	DEVMETHOD(device_detach,	bus_generic_detach),
131	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
132	DEVMETHOD(device_suspend,	bus_generic_suspend),
133	DEVMETHOD(device_resume,	bus_generic_resume),
134
135	/* Bus interface */
136	DEVMETHOD(bus_print_child,	nexus_print_child),
137	DEVMETHOD(bus_add_child,	nexus_add_child),
138	DEVMETHOD(bus_activate_resource, bus_generic_rman_activate_resource),
139	DEVMETHOD(bus_adjust_resource,	bus_generic_rman_adjust_resource),
140	DEVMETHOD(bus_alloc_resource,	nexus_alloc_resource),
141	DEVMETHOD(bus_deactivate_resource, bus_generic_rman_deactivate_resource),
142	DEVMETHOD(bus_get_resource,	bus_generic_rl_get_resource),
143	DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
144	DEVMETHOD(bus_get_rman,		nexus_get_rman),
145	DEVMETHOD(bus_delete_resource,	bus_generic_rl_delete_resource),
146	DEVMETHOD(bus_map_resource,	nexus_map_resource),
147	DEVMETHOD(bus_release_resource,	bus_generic_rman_release_resource),
148	DEVMETHOD(bus_set_resource,	bus_generic_rl_set_resource),
149	DEVMETHOD(bus_unmap_resource,	nexus_unmap_resource),
150#ifdef SMP
151	DEVMETHOD(bus_bind_intr,	nexus_bind_intr),
152#endif
153	DEVMETHOD(bus_config_intr,	nexus_config_intr),
154	DEVMETHOD(bus_describe_intr,	nexus_describe_intr),
155	DEVMETHOD(bus_resume_intr,	nexus_resume_intr),
156	DEVMETHOD(bus_setup_intr,	nexus_setup_intr),
157	DEVMETHOD(bus_suspend_intr,	nexus_suspend_intr),
158	DEVMETHOD(bus_teardown_intr,	nexus_teardown_intr),
159	DEVMETHOD(bus_get_cpus,		nexus_get_cpus),
160
161	/* pcib interface */
162#if defined(DEV_APIC) && defined(DEV_PCI)
163	DEVMETHOD(pcib_alloc_msi,	nexus_alloc_msi),
164	DEVMETHOD(pcib_release_msi,	nexus_release_msi),
165	DEVMETHOD(pcib_alloc_msix,	nexus_alloc_msix),
166	DEVMETHOD(pcib_release_msix,	nexus_release_msix),
167	DEVMETHOD(pcib_map_msi,		nexus_map_msi),
168#endif
169	DEVMETHOD_END
170};
171
172DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1);
173
174DRIVER_MODULE(nexus, root, nexus_driver, 0, 0);
175
176static int
177nexus_probe(device_t dev)
178{
179
180	device_quiet(dev);	/* suppress attach message for neatness */
181	return (BUS_PROBE_GENERIC);
182}
183
184void
185nexus_init_resources(void)
186{
187	int irq;
188
189	/*
190	 * XXX working notes:
191	 *
192	 * - IRQ resource creation should be moved to the PIC/APIC driver.
193	 * - DRQ resource creation should be moved to the DMAC driver.
194	 * - The above should be sorted to probe earlier than any child buses.
195	 *
196	 * - Leave I/O and memory creation here, as child probes may need them.
197	 *   (especially eg. ACPI)
198	 */
199
200	/*
201	 * IRQ's are on the mainboard on old systems, but on the ISA part
202	 * of PCI->ISA bridges.  There would be multiple sets of IRQs on
203	 * multi-ISA-bus systems.  PCI interrupts are routed to the ISA
204	 * component, so in a way, PCI can be a partial child of an ISA bus(!).
205	 * APIC interrupts are global though.
206	 */
207	irq_rman.rm_start = 0;
208	irq_rman.rm_type = RMAN_ARRAY;
209	irq_rman.rm_descr = "Interrupt request lines";
210	irq_rman.rm_end = num_io_irqs - 1;
211	if (rman_init(&irq_rman))
212		panic("nexus_init_resources irq_rman");
213
214	/*
215	 * We search for regions of existing IRQs and add those to the IRQ
216	 * resource manager.
217	 */
218	for (irq = 0; irq < num_io_irqs; irq++)
219		if (intr_lookup_source(irq) != NULL)
220			if (rman_manage_region(&irq_rman, irq, irq) != 0)
221				panic("nexus_init_resources irq_rman add");
222
223	/*
224	 * ISA DMA on PCI systems is implemented in the ISA part of each
225	 * PCI->ISA bridge and the channels can be duplicated if there are
226	 * multiple bridges.  (eg: laptops with docking stations)
227	 */
228	drq_rman.rm_start = 0;
229	drq_rman.rm_end = 7;
230	drq_rman.rm_type = RMAN_ARRAY;
231	drq_rman.rm_descr = "DMA request lines";
232	/* XXX drq 0 not available on some machines */
233	if (rman_init(&drq_rman)
234	    || rman_manage_region(&drq_rman,
235				  drq_rman.rm_start, drq_rman.rm_end))
236		panic("nexus_init_resources drq_rman");
237
238	/*
239	 * However, IO ports and Memory truely are global at this level,
240	 * as are APIC interrupts (however many IO APICS there turn out
241	 * to be on large systems..)
242	 */
243	port_rman.rm_start = 0;
244	port_rman.rm_end = 0xffff;
245	port_rman.rm_type = RMAN_ARRAY;
246	port_rman.rm_descr = "I/O ports";
247	if (rman_init(&port_rman)
248	    || rman_manage_region(&port_rman, 0, 0xffff))
249		panic("nexus_init_resources port_rman");
250
251	mem_rman.rm_start = 0;
252	mem_rman.rm_end = cpu_getmaxphyaddr();
253	mem_rman.rm_type = RMAN_ARRAY;
254	mem_rman.rm_descr = "I/O memory addresses";
255	if (rman_init(&mem_rman)
256	    || rman_manage_region(&mem_rman, 0, mem_rman.rm_end))
257		panic("nexus_init_resources mem_rman");
258}
259
260static int
261nexus_attach(device_t dev)
262{
263
264	nexus_init_resources();
265	bus_generic_probe(dev);
266
267	/*
268	 * Explicitly add the legacy0 device here.  Other platform
269	 * types (such as ACPI), use their own nexus(4) subclass
270	 * driver to override this routine and add their own root bus.
271	 */
272	if (BUS_ADD_CHILD(dev, 10, "legacy", 0) == NULL)
273		panic("legacy: could not attach");
274	bus_generic_attach(dev);
275	return (0);
276}
277
278static int
279nexus_print_all_resources(device_t dev)
280{
281	struct	nexus_device *ndev = DEVTONX(dev);
282	struct resource_list *rl = &ndev->nx_resources;
283	int retval = 0;
284
285	if (STAILQ_FIRST(rl))
286		retval += printf(" at");
287
288	retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#jx");
289	retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#jx");
290	retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
291
292	return (retval);
293}
294
295static int
296nexus_print_child(device_t bus, device_t child)
297{
298	int retval = 0;
299
300	retval += bus_print_child_header(bus, child);
301	retval += nexus_print_all_resources(child);
302	if (device_get_flags(child))
303		retval += printf(" flags %#x", device_get_flags(child));
304	retval += printf("\n");
305
306	return (retval);
307}
308
309static device_t
310nexus_add_child(device_t bus, u_int order, const char *name, int unit)
311{
312	device_t		child;
313	struct nexus_device	*ndev;
314
315	ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
316	if (!ndev)
317		return (0);
318	resource_list_init(&ndev->nx_resources);
319
320	child = device_add_child_ordered(bus, order, name, unit);
321
322	/* should we free this in nexus_child_detached? */
323	device_set_ivars(child, ndev);
324
325	return (child);
326}
327
328static struct rman *
329nexus_get_rman(device_t bus, int type, u_int flags)
330{
331	switch (type) {
332	case SYS_RES_IRQ:
333		return (&irq_rman);
334	case SYS_RES_DRQ:
335		return (&drq_rman);
336	case SYS_RES_IOPORT:
337		return (&port_rman);
338	case SYS_RES_MEMORY:
339		return (&mem_rman);
340	default:
341		return (NULL);
342	}
343}
344
345/*
346 * Allocate a resource on behalf of child.  NB: child is usually going to be a
347 * child of one of our descendants, not a direct child of nexus0.
348 */
349static struct resource *
350nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
351		     rman_res_t start, rman_res_t end, rman_res_t count,
352		     u_int flags)
353{
354	struct nexus_device *ndev = DEVTONX(child);
355	struct resource_list_entry *rle;
356
357	/*
358	 * If this is an allocation of the "default" range for a given
359	 * RID, and we know what the resources for this device are
360	 * (ie. they aren't maintained by a child bus), then work out
361	 * the start/end values.
362	 */
363	if (RMAN_IS_DEFAULT_RANGE(start, end) && (count == 1)) {
364		if (device_get_parent(child) != bus || ndev == NULL)
365			return (NULL);
366		rle = resource_list_find(&ndev->nx_resources, type, *rid);
367		if (rle == NULL)
368			return (NULL);
369		start = rle->start;
370		end = rle->end;
371		count = rle->count;
372	}
373
374	return (bus_generic_rman_alloc_resource(bus, child, type, rid,
375	    start, end, count, flags));
376}
377
378static int
379nexus_map_resource(device_t bus, device_t child, struct resource *r,
380    struct resource_map_request *argsp, struct resource_map *map)
381{
382	struct resource_map_request args;
383	rman_res_t length, start;
384	int error, type;
385
386	/* Resources must be active to be mapped. */
387	if (!(rman_get_flags(r) & RF_ACTIVE))
388		return (ENXIO);
389
390	/* Mappings are only supported on I/O and memory resources. */
391	type = rman_get_type(r);
392	switch (type) {
393	case SYS_RES_IOPORT:
394	case SYS_RES_MEMORY:
395		break;
396	default:
397		return (EINVAL);
398	}
399
400	resource_init_map_request(&args);
401	error = resource_validate_map_request(r, argsp, &args, &start, &length);
402	if (error)
403		return (error);
404
405	/*
406	 * If this is a memory resource, map it into the kernel.
407	 */
408	switch (type) {
409	case SYS_RES_IOPORT:
410		map->r_bushandle = start;
411		map->r_bustag = X86_BUS_SPACE_IO;
412		map->r_size = length;
413		map->r_vaddr = NULL;
414		break;
415	case SYS_RES_MEMORY:
416		map->r_vaddr = pmap_mapdev_attr(start, length, args.memattr);
417		map->r_bustag = X86_BUS_SPACE_MEM;
418		map->r_size = length;
419
420		/*
421		 * The handle is the virtual address.
422		 */
423		map->r_bushandle = (bus_space_handle_t)map->r_vaddr;
424		break;
425	}
426	return (0);
427}
428
429static int
430nexus_unmap_resource(device_t bus, device_t child, struct resource *r,
431    struct resource_map *map)
432{
433
434	/*
435	 * If this is a memory resource, unmap it.
436	 */
437	switch (rman_get_type(r)) {
438	case SYS_RES_MEMORY:
439		pmap_unmapdev(map->r_vaddr, map->r_size);
440		/* FALLTHROUGH */
441	case SYS_RES_IOPORT:
442		break;
443	default:
444		return (EINVAL);
445	}
446	return (0);
447}
448
449/*
450 * Currently this uses the really grody interface from kern/kern_intr.c
451 * (which really doesn't belong in kern/anything.c).  Eventually, all of
452 * the code in kern_intr.c and machdep_intr.c should get moved here, since
453 * this is going to be the official interface.
454 */
455static int
456nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
457		 int flags, driver_filter_t filter, void (*ihand)(void *),
458		 void *arg, void **cookiep)
459{
460	int		error, domain;
461	struct intsrc	*isrc;
462
463	/* somebody tried to setup an irq that failed to allocate! */
464	if (irq == NULL)
465		panic("nexus_setup_intr: NULL irq resource!");
466
467	*cookiep = NULL;
468	if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
469		flags |= INTR_EXCL;
470
471	/*
472	 * We depend here on rman_activate_resource() being idempotent.
473	 */
474	error = rman_activate_resource(irq);
475	if (error != 0)
476		return (error);
477	if (bus_get_domain(child, &domain) != 0)
478		domain = 0;
479
480	isrc = intr_lookup_source(rman_get_start(irq));
481	if (isrc == NULL)
482		return (EINVAL);
483	error = intr_add_handler(isrc, device_get_nameunit(child),
484	    filter, ihand, arg, flags, cookiep, domain);
485	if (error == 0)
486		rman_set_irq_cookie(irq, *cookiep);
487
488	return (error);
489}
490
491static int
492nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
493{
494	int error;
495
496	error = intr_remove_handler(ih);
497	if (error == 0)
498		rman_set_irq_cookie(r, NULL);
499	return (error);
500}
501
502static int
503nexus_suspend_intr(device_t dev, device_t child, struct resource *irq)
504{
505	return (intr_event_suspend_handler(rman_get_irq_cookie(irq)));
506}
507
508static int
509nexus_resume_intr(device_t dev, device_t child, struct resource *irq)
510{
511	return (intr_event_resume_handler(rman_get_irq_cookie(irq)));
512}
513
514#ifdef SMP
515static int
516nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
517{
518	struct intsrc *isrc;
519
520	isrc = intr_lookup_source(rman_get_start(irq));
521	if (isrc == NULL)
522		return (EINVAL);
523	return (intr_event_bind(isrc->is_event, cpu));
524}
525#endif
526
527static int
528nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
529    enum intr_polarity pol)
530{
531	struct intsrc *isrc;
532
533	isrc = intr_lookup_source(irq);
534	if (isrc == NULL)
535		return (EINVAL);
536	return (intr_config_intr(isrc, trig, pol));
537}
538
539static int
540nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
541    void *cookie, const char *descr)
542{
543	struct intsrc *isrc;
544
545	isrc = intr_lookup_source(rman_get_start(irq));
546	if (isrc == NULL)
547		return (EINVAL);
548	return (intr_describe(isrc, cookie, descr));
549}
550
551static struct resource_list *
552nexus_get_reslist(device_t dev, device_t child)
553{
554	struct nexus_device *ndev = DEVTONX(child);
555
556	return (&ndev->nx_resources);
557}
558
559static int
560nexus_get_cpus(device_t dev, device_t child, enum cpu_sets op, size_t setsize,
561    cpuset_t *cpuset)
562{
563
564	switch (op) {
565#ifdef SMP
566	case INTR_CPUS:
567		if (setsize != sizeof(cpuset_t))
568			return (EINVAL);
569		*cpuset = intr_cpus;
570		return (0);
571#endif
572	default:
573		return (bus_generic_get_cpus(dev, child, op, setsize, cpuset));
574	}
575}
576
577/* Called from the MSI code to add new IRQs to the IRQ rman. */
578void
579nexus_add_irq(u_long irq)
580{
581
582	if (rman_manage_region(&irq_rman, irq, irq) != 0)
583		panic("%s: failed", __func__);
584}
585
586#if defined(DEV_APIC) && defined(DEV_PCI)
587static int
588nexus_alloc_msix(device_t pcib, device_t dev, int *irq)
589{
590
591	return (msix_alloc(dev, irq));
592}
593
594static int
595nexus_release_msix(device_t pcib, device_t dev, int irq)
596{
597
598	return (msix_release(irq));
599}
600
601static int
602nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
603{
604
605	return (msi_alloc(dev, count, maxcount, irqs));
606}
607
608static int
609nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
610{
611
612	return (msi_release(irqs, count));
613}
614
615static int
616nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data)
617{
618
619	return (msi_map(irq, addr, data));
620}
621#endif /* DEV_APIC && DEV_PCI */
622
623/* Placeholder for system RAM. */
624static void
625ram_identify(driver_t *driver, device_t parent)
626{
627
628	if (resource_disabled("ram", 0))
629		return;
630	if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
631		panic("ram_identify");
632}
633
634static int
635ram_probe(device_t dev)
636{
637
638	device_quiet(dev);
639	device_set_desc(dev, "System RAM");
640	return (0);
641}
642
643static int
644ram_attach(device_t dev)
645{
646	struct bios_smap *smapbase, *smap, *smapend;
647	struct resource *res;
648	rman_res_t length;
649	vm_paddr_t *p;
650	caddr_t kmdp;
651	uint32_t smapsize;
652	int error, rid;
653
654	/* Retrieve the system memory map from the loader. */
655	kmdp = preload_search_by_type("elf kernel");
656	if (kmdp == NULL)
657		kmdp = preload_search_by_type(ELF_KERN_STR);
658	smapbase = (struct bios_smap *)preload_search_info(kmdp,
659	    MODINFO_METADATA | MODINFOMD_SMAP);
660	if (smapbase != NULL) {
661		smapsize = *((u_int32_t *)smapbase - 1);
662		smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
663
664		rid = 0;
665		for (smap = smapbase; smap < smapend; smap++) {
666			if (smap->type != SMAP_TYPE_MEMORY ||
667			    smap->length == 0)
668				continue;
669			if (smap->base > mem_rman.rm_end)
670				continue;
671			length = smap->base + smap->length > mem_rman.rm_end ?
672			    mem_rman.rm_end - smap->base : smap->length;
673			error = bus_set_resource(dev, SYS_RES_MEMORY, rid,
674			    smap->base, length);
675			if (error)
676				panic(
677				    "ram_attach: resource %d failed set with %d",
678				    rid, error);
679			res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
680			    0);
681			if (res == NULL)
682				panic("ram_attach: resource %d failed to attach",
683				    rid);
684			rid++;
685		}
686		return (0);
687	}
688
689	/*
690	 * If the system map is not available, fall back to using
691	 * dump_avail[].  We use the dump_avail[] array rather than
692	 * phys_avail[] for the memory map as phys_avail[] contains
693	 * holes for kernel memory, page 0, the message buffer, and
694	 * the dcons buffer.  We test the end address in the loop
695	 * instead of the start since the start address for the first
696	 * segment is 0.
697	 */
698	for (rid = 0, p = dump_avail; p[1] != 0; rid++, p += 2) {
699		if (p[0] > mem_rman.rm_end)
700			break;
701		length = (p[1] > mem_rman.rm_end ? mem_rman.rm_end : p[1]) -
702		    p[0];
703		error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0],
704		    length);
705		if (error)
706			panic("ram_attach: resource %d failed set with %d", rid,
707			    error);
708		res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
709		if (res == NULL)
710			panic("ram_attach: resource %d failed to attach", rid);
711	}
712	return (0);
713}
714
715static device_method_t ram_methods[] = {
716	/* Device interface */
717	DEVMETHOD(device_identify,	ram_identify),
718	DEVMETHOD(device_probe,		ram_probe),
719	DEVMETHOD(device_attach,	ram_attach),
720
721	DEVMETHOD_END
722};
723
724static driver_t ram_driver = {
725	"ram",
726	ram_methods,
727	1,		/* no softc */
728};
729
730DRIVER_MODULE(ram, nexus, ram_driver, 0, 0);
731
732#ifdef DEV_ISA
733/*
734 * Placeholder which claims PnP 'devices' which describe system
735 * resources.
736 */
737static struct isa_pnp_id sysresource_ids[] = {
738	{ 0x010cd041 /* PNP0c01 */, "System Memory" },
739	{ 0x020cd041 /* PNP0c02 */, "System Resource" },
740	{ 0 }
741};
742
743static int
744sysresource_probe(device_t dev)
745{
746	int	result;
747
748	if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
749		device_quiet(dev);
750	}
751	return (result);
752}
753
754static int
755sysresource_attach(device_t dev)
756{
757	return (0);
758}
759
760static device_method_t sysresource_methods[] = {
761	/* Device interface */
762	DEVMETHOD(device_probe,		sysresource_probe),
763	DEVMETHOD(device_attach,	sysresource_attach),
764	DEVMETHOD(device_detach,	bus_generic_detach),
765	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
766	DEVMETHOD(device_suspend,	bus_generic_suspend),
767	DEVMETHOD(device_resume,	bus_generic_resume),
768
769	DEVMETHOD_END
770};
771
772static driver_t sysresource_driver = {
773	"sysresource",
774	sysresource_methods,
775	1,		/* no softc */
776};
777
778DRIVER_MODULE(sysresource, isa, sysresource_driver, 0, 0);
779ISA_PNP_INFO(sysresource_ids);
780#endif /* DEV_ISA */
781