FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/bios.c
1 /*-
2 * Copyright (c) 1997 Michael Smith
3 * Copyright (c) 1998 Jonathan Lemon
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/5.0/sys/i386/i386/bios.c 103870 2002-09-23 18:54:32Z alfred $
28 */
29
30 /*
31 * Code for dealing with the BIOS in x86 PC systems.
32 */
33
34 #include "opt_isa.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40 #include <sys/bus.h>
41 #include <sys/pcpu.h>
42 #include <vm/vm.h>
43 #include <vm/pmap.h>
44 #include <machine/md_var.h>
45 #include <machine/segments.h>
46 #include <machine/stdarg.h>
47 #include <machine/vmparam.h>
48 #include <machine/pc/bios.h>
49 #ifdef DEV_ISA
50 #include <isa/isavar.h>
51 #include <isa/pnpreg.h>
52 #include <isa/pnpvar.h>
53 #endif
54
55 #define BIOS_START 0xe0000
56 #define BIOS_SIZE 0x20000
57
58 /* exported lookup results */
59 struct bios32_SDentry PCIbios;
60 struct PnPBIOS_table *PnPBIOStable;
61
62 static u_int bios32_SDCI;
63
64 /* start fairly early */
65 static void bios32_init(void *junk);
66 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL);
67
68 /*
69 * bios32_init
70 *
71 * Locate various bios32 entities.
72 */
73 static void
74 bios32_init(void *junk)
75 {
76 u_long sigaddr;
77 struct bios32_SDheader *sdh;
78 struct PnPBIOS_table *pt;
79 u_int8_t ck, *cv;
80 int i;
81 char *p;
82
83 /*
84 * BIOS32 Service Directory, PCI BIOS
85 */
86
87 /* look for the signature */
88 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) {
89
90 /* get a virtual pointer to the structure */
91 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
92 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) {
93 ck += cv[i];
94 }
95 /* If checksum is OK, enable use of the entrypoint */
96 if ((ck == 0) && (BIOS_START <= sdh->entry ) &&
97 (sdh->entry < (BIOS_START + BIOS_SIZE))) {
98 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry);
99 if (bootverbose) {
100 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh);
101 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n",
102 sdh->entry, bios32_SDCI, sdh->revision, sdh->len);
103 }
104
105 /* Allow user override of PCI BIOS search */
106 if (((p = getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) {
107
108 /* See if there's a PCI BIOS entrypoint here */
109 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */
110 if (!bios32_SDlookup(&PCIbios) && bootverbose)
111 printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry);
112 }
113 if (p != NULL)
114 freeenv(p);
115 } else {
116 printf("bios32: Bad BIOS32 Service Directory\n");
117 }
118 }
119
120 /*
121 * PnP BIOS
122 *
123 * Allow user override of PnP BIOS search
124 */
125 if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) &&
126 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) {
127
128 /* get a virtual pointer to the structure */
129 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
130 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) {
131 ck += cv[i];
132 }
133 /* If checksum is OK, enable use of the entrypoint */
134 if (ck == 0) {
135 PnPBIOStable = pt;
136 if (bootverbose) {
137 printf("pnpbios: Found PnP BIOS data at %p\n", pt);
138 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n",
139 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf);
140 if ((pt->control & 0x3) == 0x01)
141 printf("pnpbios: Event flag at %x\n", pt->evflagaddr);
142 if (pt->oemdevid != 0)
143 printf("pnpbios: OEM ID %x\n", pt->oemdevid);
144
145 }
146 } else {
147 printf("pnpbios: Bad PnP BIOS data checksum\n");
148 }
149 }
150 if (p != NULL)
151 freeenv(p);
152 if (bootverbose) {
153 /* look for other know signatures */
154 printf("Other BIOS signatures found:\n");
155 }
156 }
157
158 /*
159 * bios32_SDlookup
160 *
161 * Query the BIOS32 Service Directory for the service named in (ent),
162 * returns nonzero if the lookup fails. The caller must fill in
163 * (ent->ident), the remainder are populated on a successful lookup.
164 */
165 int
166 bios32_SDlookup(struct bios32_SDentry *ent)
167 {
168 struct bios_regs args;
169
170 if (bios32_SDCI == 0)
171 return (1);
172
173 args.eax = ent->ident.id; /* set up arguments */
174 args.ebx = args.ecx = args.edx = 0;
175 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL));
176 if ((args.eax & 0xff) == 0) { /* success? */
177 ent->base = args.ebx;
178 ent->len = args.ecx;
179 ent->entry = args.edx;
180 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry);
181 return (0); /* all OK */
182 }
183 return (1); /* failed */
184 }
185
186
187 /*
188 * bios_sigsearch
189 *
190 * Search some or all of the BIOS region for a signature string.
191 *
192 * (start) Optional offset returned from this function
193 * (for searching for multiple matches), or NULL
194 * to start the search from the base of the BIOS.
195 * Note that this will be a _physical_ address in
196 * the range 0xe0000 - 0xfffff.
197 * (sig) is a pointer to the byte(s) of the signature.
198 * (siglen) number of bytes in the signature.
199 * (paralen) signature paragraph (alignment) size.
200 * (sigofs) offset of the signature within the paragraph.
201 *
202 * Returns the _physical_ address of the found signature, 0 if the
203 * signature was not found.
204 */
205
206 u_int32_t
207 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
208 {
209 u_char *sp, *end;
210
211 /* compute the starting address */
212 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
213 sp = (char *)BIOS_PADDRTOVADDR(start);
214 } else if (start == 0) {
215 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
216 } else {
217 return 0; /* bogus start address */
218 }
219
220 /* compute the end address */
221 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
222
223 /* loop searching */
224 while ((sp + sigofs + siglen) < end) {
225
226 /* compare here */
227 if (!bcmp(sp + sigofs, sig, siglen)) {
228 /* convert back to physical address */
229 return((u_int32_t)BIOS_VADDRTOPADDR(sp));
230 }
231 sp += paralen;
232 }
233 return(0);
234 }
235
236 /*
237 * do not staticize, used by bioscall.s
238 */
239 union {
240 struct {
241 u_short offset;
242 u_short segment;
243 } vec16;
244 struct {
245 u_int offset;
246 u_short segment;
247 } vec32;
248 } bioscall_vector; /* bios jump vector */
249
250 void
251 set_bios_selectors(struct bios_segments *seg, int flags)
252 {
253 struct soft_segment_descriptor ssd = {
254 0, /* segment base address (overwritten) */
255 0, /* length (overwritten) */
256 SDT_MEMERA, /* segment type (overwritten) */
257 0, /* priority level */
258 1, /* descriptor present */
259 0, 0,
260 1, /* descriptor size (overwritten) */
261 0 /* granularity == byte units */
262 };
263 union descriptor *p_gdt;
264
265 #ifdef SMP
266 p_gdt = &gdt[PCPU_GET(cpuid) * NGDT];
267 #else
268 p_gdt = gdt;
269 #endif
270
271 ssd.ssd_base = seg->code32.base;
272 ssd.ssd_limit = seg->code32.limit;
273 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd);
274
275 ssd.ssd_def32 = 0;
276 if (flags & BIOSCODE_FLAG) {
277 ssd.ssd_base = seg->code16.base;
278 ssd.ssd_limit = seg->code16.limit;
279 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd);
280 }
281
282 ssd.ssd_type = SDT_MEMRWA;
283 if (flags & BIOSDATA_FLAG) {
284 ssd.ssd_base = seg->data.base;
285 ssd.ssd_limit = seg->data.limit;
286 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd);
287 }
288
289 if (flags & BIOSUTIL_FLAG) {
290 ssd.ssd_base = seg->util.base;
291 ssd.ssd_limit = seg->util.limit;
292 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd);
293 }
294
295 if (flags & BIOSARGS_FLAG) {
296 ssd.ssd_base = seg->args.base;
297 ssd.ssd_limit = seg->args.limit;
298 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd);
299 }
300 }
301
302 extern int vm86pa;
303 extern void bios16_jmp(void);
304
305 /*
306 * this routine is really greedy with selectors, and uses 5:
307 *
308 * 32-bit code selector: to return to kernel
309 * 16-bit code selector: for running code
310 * data selector: for 16-bit data
311 * util selector: extra utility selector
312 * args selector: to handle pointers
313 *
314 * the util selector is set from the util16 entry in bios16_args, if a
315 * "U" specifier is seen.
316 *
317 * See <machine/pc/bios.h> for description of format specifiers
318 */
319 int
320 bios16(struct bios_args *args, char *fmt, ...)
321 {
322 char *p, *stack, *stack_top;
323 va_list ap;
324 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG;
325 u_int i, arg_start, arg_end;
326 pt_entry_t *pte;
327 pd_entry_t *ptd;
328
329 arg_start = 0xffffffff;
330 arg_end = 0;
331
332 /*
333 * Some BIOS entrypoints attempt to copy the largest-case
334 * argument frame (in order to generalise handling for
335 * different entry types). If our argument frame is
336 * smaller than this, the BIOS will reach off the top of
337 * our constructed stack segment. Pad the top of the stack
338 * with some garbage to avoid this.
339 */
340 stack = (caddr_t)PAGE_SIZE - 32;
341
342 va_start(ap, fmt);
343 for (p = fmt; p && *p; p++) {
344 switch (*p) {
345 case 'p': /* 32-bit pointer */
346 i = va_arg(ap, u_int);
347 arg_start = min(arg_start, i);
348 arg_end = max(arg_end, i);
349 flags |= BIOSARGS_FLAG;
350 stack -= 4;
351 break;
352
353 case 'i': /* 32-bit integer */
354 i = va_arg(ap, u_int);
355 stack -= 4;
356 break;
357
358 case 'U': /* 16-bit selector */
359 flags |= BIOSUTIL_FLAG;
360 /* FALLTHROUGH */
361 case 'D': /* 16-bit selector */
362 case 'C': /* 16-bit selector */
363 stack -= 2;
364 break;
365
366 case 's': /* 16-bit integer passed as an int */
367 i = va_arg(ap, int);
368 stack -= 2;
369 break;
370
371 default:
372 return (EINVAL);
373 }
374 }
375
376 if (flags & BIOSARGS_FLAG) {
377 if (arg_end - arg_start > ctob(16))
378 return (EACCES);
379 args->seg.args.base = arg_start;
380 args->seg.args.limit = 0xffff;
381 }
382
383 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME;
384 args->seg.code32.limit = 0xffff;
385
386 ptd = (pd_entry_t *)rcr3();
387 if (ptd == (u_int *)IdlePTD) {
388 /*
389 * no page table, so create one and install it.
390 */
391 pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
392 ptd = (pd_entry_t *)((u_int)ptd + KERNBASE);
393 *ptd = vtophys(pte) | PG_RW | PG_V;
394 } else {
395 /*
396 * this is a user-level page table
397 */
398 pte = PTmap;
399 }
400 /*
401 * install pointer to page 0. we don't need to flush the tlb,
402 * since there should not be a previous mapping for page 0.
403 */
404 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
405
406 stack_top = stack;
407 va_start(ap, fmt);
408 for (p = fmt; p && *p; p++) {
409 switch (*p) {
410 case 'p': /* 32-bit pointer */
411 i = va_arg(ap, u_int);
412 *(u_int *)stack = (i - arg_start) |
413 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16);
414 stack += 4;
415 break;
416
417 case 'i': /* 32-bit integer */
418 i = va_arg(ap, u_int);
419 *(u_int *)stack = i;
420 stack += 4;
421 break;
422
423 case 'U': /* 16-bit selector */
424 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL);
425 stack += 2;
426 break;
427
428 case 'D': /* 16-bit selector */
429 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL);
430 stack += 2;
431 break;
432
433 case 'C': /* 16-bit selector */
434 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL);
435 stack += 2;
436 break;
437
438 case 's': /* 16-bit integer passed as an int */
439 i = va_arg(ap, int);
440 *(u_short *)stack = i;
441 stack += 2;
442 break;
443
444 default:
445 return (EINVAL);
446 }
447 }
448
449 set_bios_selectors(&args->seg, flags);
450 bioscall_vector.vec16.offset = (u_short)args->entry;
451 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL);
452
453 i = bios16_call(&args->r, stack_top);
454
455 if (pte == PTmap) {
456 *pte = 0; /* remove entry */
457 } else {
458 *ptd = 0; /* remove page table */
459 free(pte, M_TEMP); /* ... and free it */
460 }
461
462 /*
463 * XXX only needs to be invlpg(0) but that doesn't work on the 386
464 */
465 pmap_invalidate_all(kernel_pmap);
466
467 return (i);
468 }
469
470 #ifdef DEV_ISA
471 /*
472 * PnP BIOS interface; enumerate devices only known to the system
473 * BIOS and save information about them for later use.
474 */
475
476 struct pnp_sysdev
477 {
478 u_int16_t size;
479 u_int8_t handle;
480 u_int32_t devid;
481 u_int8_t type[3];
482 u_int16_t attrib;
483 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */
484 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */
485 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */
486 #define PNPATTR_INPUT (1<<3) /* can be primary input */
487 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */
488 #define PNPATTR_DOCK (1<<5) /* is a docking station */
489 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */
490 #define PNPATTR_CONFIG_STATIC (0)
491 #define PNPATTR_CONFIG_DYNAMIC (1)
492 #define PNPATTR_CONFIG_DYNONLY (3)
493 #define PNPATTR_CONFIG(a) (((a) >> 7) & 0x3)
494 /* device-specific data comes here */
495 u_int8_t devdata[0];
496 } __packed;
497
498 /* We have to cluster arguments within a 64k range for the bios16 call */
499 struct pnp_sysdevargs
500 {
501 u_int16_t next;
502 struct pnp_sysdev node;
503 };
504
505 /*
506 * This function is called after the bus has assigned resource
507 * locations for a logical device.
508 */
509 static void
510 pnpbios_set_config(void *arg, struct isa_config *config, int enable)
511 {
512 }
513
514 /*
515 * Quiz the PnP BIOS, build a list of PNP IDs and resource data.
516 */
517 static void
518 pnpbios_identify(driver_t *driver, device_t parent)
519 {
520 struct PnPBIOS_table *pt = PnPBIOStable;
521 struct bios_args args;
522 struct pnp_sysdev *pd;
523 struct pnp_sysdevargs *pda;
524 u_int16_t ndevs, bigdev;
525 int error, currdev;
526 u_int8_t *devnodebuf, tag;
527 u_int32_t *devid, *compid;
528 int idx, left;
529 device_t dev;
530
531 /* no PnP BIOS information */
532 if (pt == NULL)
533 return;
534
535 /* ACPI already active */
536 if (devclass_get_softc(devclass_find("ACPI"), 0) != NULL)
537 return;
538
539 /* get count of PnP devices */
540 bzero(&args, sizeof(args));
541 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase);
542 args.seg.code16.limit = 0xffff; /* XXX ? */
543 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg);
544 args.seg.data.limit = 0xffff;
545 args.entry = pt->pmentryoffset;
546
547 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff))
548 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
549 ndevs &= 0xff; /* clear high byte garbage */
550 if (bootverbose)
551 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
552
553 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
554 M_DEVBUF, M_NOWAIT);
555 pda = (struct pnp_sysdevargs *)devnodebuf;
556 pd = &pda->node;
557
558 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) {
559
560 bzero(pd, bigdev);
561 pda->next = currdev;
562 /* get current configuration */
563 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) {
564 printf("pnpbios: error %d making BIOS16 call\n", error);
565 break;
566 }
567 if ((error = (args.r.eax & 0xff))) {
568 if (bootverbose)
569 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev);
570 if (error & 0x80)
571 break;
572 }
573 currdev = pda->next;
574 if (pd->size < sizeof(struct pnp_sysdev)) {
575 printf("pnpbios: bogus system node data, aborting scan\n");
576 break;
577 }
578
579 /*
580 * If we are in APIC_IO mode, we should ignore the ISA PIC if it
581 * shows up. Likewise, in !APIC_IO mode, we should ignore the
582 * APIC (less important).
583 * This is significant because the ISA PIC will claim IRQ 2 (which
584 * it uses for chaining), while in APIC mode this is a valid IRQ
585 * available for general use.
586 */
587 #ifdef APIC_IO
588 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */
589 continue;
590 #else
591 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */
592 continue;
593 #endif
594
595 /* Add the device and parse its resources */
596 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
597 isa_set_vendorid(dev, pd->devid);
598 isa_set_logicalid(dev, pd->devid);
599 /*
600 * It appears that some PnP BIOS doesn't allow us to re-enable
601 * the embedded system device once it is disabled. We shall
602 * mark all system device nodes as "cannot be disabled", regardless
603 * of actual settings in the device attribute byte.
604 * XXX
605 isa_set_configattr(dev,
606 ((pd->attrib & PNPATTR_NODISABLE) ? 0 : ISACFGATTR_CANDISABLE) |
607 ((!(pd->attrib & PNPATTR_NOCONFIG) &&
608 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
609 ? ISACFGATTR_DYNAMIC : 0));
610 */
611 isa_set_configattr(dev,
612 (!(pd->attrib & PNPATTR_NOCONFIG) &&
613 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
614 ? ISACFGATTR_DYNAMIC : 0);
615 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0);
616 pnp_parse_resources(dev, &pd->devdata[0],
617 pd->size - sizeof(struct pnp_sysdev), 0);
618 if (!device_get_desc(dev))
619 device_set_desc_copy(dev, pnp_eisaformat(pd->devid));
620
621 /* Find device IDs */
622 devid = &pd->devid;
623 compid = NULL;
624
625 /* look for a compatible device ID too */
626 left = pd->size - sizeof(struct pnp_sysdev);
627 idx = 0;
628 while (idx < left) {
629 tag = pd->devdata[idx++];
630 if (PNP_RES_TYPE(tag) == 0) {
631 /* Small resource */
632 switch (PNP_SRES_NUM(tag)) {
633 case PNP_TAG_COMPAT_DEVICE:
634 compid = (u_int32_t *)(pd->devdata + idx);
635 if (bootverbose)
636 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid);
637 /* FALLTHROUGH */
638 case PNP_TAG_END:
639 idx = left;
640 break;
641 default:
642 idx += PNP_SRES_LEN(tag);
643 break;
644 }
645 } else
646 /* Large resource, skip it */
647 idx += *(u_int16_t *)(pd->devdata + idx) + 2;
648 }
649 if (bootverbose) {
650 printf("pnpbios: handle %d device ID %s (%08x)",
651 pd->handle, pnp_eisaformat(*devid), *devid);
652 if (compid != NULL)
653 printf(" compat ID %s (%08x)",
654 pnp_eisaformat(*compid), *compid);
655 printf("\n");
656 }
657 }
658 }
659
660 static device_method_t pnpbios_methods[] = {
661 /* Device interface */
662 DEVMETHOD(device_identify, pnpbios_identify),
663
664 { 0, 0 }
665 };
666
667 static driver_t pnpbios_driver = {
668 "pnpbios",
669 pnpbios_methods,
670 1, /* no softc */
671 };
672
673 static devclass_t pnpbios_devclass;
674
675 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0);
676 #endif /* DEV_ISA */
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