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
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31/*
32 * Code for dealing with the BIOS in x86 PC systems.
33 */
34
35#include "opt_isa.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/malloc.h>
41#include <sys/module.h>
42#include <sys/bus.h>
43#include <sys/pcpu.h>
44#include <vm/vm.h>
45#include <vm/pmap.h>
46#include <machine/md_var.h>
47#include <machine/segments.h>
48#include <machine/stdarg.h>
49#include <machine/vmparam.h>
50#include <machine/pc/bios.h>
51#ifdef DEV_ISA
52#include <isa/isavar.h>
53#include <isa/pnpreg.h>
54#include <isa/pnpvar.h>
55#endif
56
57#define BIOS_START	0xe0000
58#define BIOS_SIZE	0x20000
59
60/* exported lookup results */
61struct bios32_SDentry		PCIbios;
62
63static struct PnPBIOS_table	*PnPBIOStable;
64
65static u_int			bios32_SDCI;
66
67/* start fairly early */
68static void			bios32_init(void *junk);
69SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL);
70
71/*
72 * bios32_init
73 *
74 * Locate various bios32 entities.
75 */
76static void
77bios32_init(void *junk)
78{
79    u_long			sigaddr;
80    struct bios32_SDheader	*sdh;
81    struct PnPBIOS_table	*pt;
82    u_int8_t			ck, *cv;
83    int				i;
84    char			*p;
85
86    /*
87     * BIOS32 Service Directory, PCI BIOS
88     */
89
90    /* look for the signature */
91    if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) {
92
93	/* get a virtual pointer to the structure */
94	sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
95	for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) {
96	    ck += cv[i];
97	}
98	/* If checksum is OK, enable use of the entrypoint */
99	if ((ck == 0) && (BIOS_START <= sdh->entry ) &&
100	    (sdh->entry < (BIOS_START + BIOS_SIZE))) {
101	    bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry);
102	    if (bootverbose) {
103		printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh);
104		printf("bios32: Entry = 0x%x (%x)  Rev = %d  Len = %d\n",
105		       sdh->entry, bios32_SDCI, sdh->revision, sdh->len);
106	    }
107
108	    /* Allow user override of PCI BIOS search */
109	    if (((p = getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) {
110
111		/* See if there's a PCI BIOS entrypoint here */
112		PCIbios.ident.id = 0x49435024;	/* PCI systems should have this */
113		if (!bios32_SDlookup(&PCIbios) && bootverbose)
114		    printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry);
115	    }
116	    if (p != NULL)
117		    freeenv(p);
118	} else {
119	    printf("bios32: Bad BIOS32 Service Directory\n");
120	}
121    }
122
123    /*
124     * PnP BIOS
125     *
126     * Allow user override of PnP BIOS search
127     */
128    if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) &&
129	((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) {
130
131	/* get a virtual pointer to the structure */
132	pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
133	for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) {
134	    ck += cv[i];
135	}
136	/* If checksum is OK, enable use of the entrypoint */
137	if (ck == 0) {
138	    PnPBIOStable = pt;
139	    if (bootverbose) {
140		printf("pnpbios: Found PnP BIOS data at %p\n", pt);
141		printf("pnpbios: Entry = %x:%x  Rev = %d.%d\n",
142		       pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf);
143		if ((pt->control & 0x3) == 0x01)
144		    printf("pnpbios: Event flag at %x\n", pt->evflagaddr);
145		if (pt->oemdevid != 0)
146		    printf("pnpbios: OEM ID %x\n", pt->oemdevid);
147
148	    }
149	} else {
150	    printf("pnpbios: Bad PnP BIOS data checksum\n");
151	}
152    }
153    if (p != NULL)
154	    freeenv(p);
155    if (bootverbose) {
156	    /* look for other know signatures */
157	    printf("Other BIOS signatures found:\n");
158    }
159}
160
161/*
162 * bios32_SDlookup
163 *
164 * Query the BIOS32 Service Directory for the service named in (ent),
165 * returns nonzero if the lookup fails.  The caller must fill in
166 * (ent->ident), the remainder are populated on a successful lookup.
167 */
168int
169bios32_SDlookup(struct bios32_SDentry *ent)
170{
171    struct bios_regs args;
172
173    if (bios32_SDCI == 0)
174	return (1);
175
176    args.eax = ent->ident.id;		/* set up arguments */
177    args.ebx = args.ecx = args.edx = 0;
178    bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL));
179    if ((args.eax & 0xff) == 0) {	/* success? */
180	ent->base = args.ebx;
181	ent->len = args.ecx;
182	ent->entry = args.edx;
183	ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry);
184	return (0);			/* all OK */
185    }
186    return (1);				/* failed */
187}
188
189
190/*
191 * bios_sigsearch
192 *
193 * Search some or all of the BIOS region for a signature string.
194 *
195 * (start)	Optional offset returned from this function
196 *		(for searching for multiple matches), or NULL
197 *		to start the search from the base of the BIOS.
198 *		Note that this will be a _physical_ address in
199 *		the range 0xe0000 - 0xfffff.
200 * (sig)	is a pointer to the byte(s) of the signature.
201 * (siglen)	number of bytes in the signature.
202 * (paralen)	signature paragraph (alignment) size.
203 * (sigofs)	offset of the signature within the paragraph.
204 *
205 * Returns the _physical_ address of the found signature, 0 if the
206 * signature was not found.
207 */
208
209u_int32_t
210bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
211{
212    u_char	*sp, *end;
213
214    /* compute the starting address */
215    if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
216	sp = (char *)BIOS_PADDRTOVADDR(start);
217    } else if (start == 0) {
218	sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
219    } else {
220	return 0;				/* bogus start address */
221    }
222
223    /* compute the end address */
224    end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
225
226    /* loop searching */
227    while ((sp + sigofs + siglen) < end) {
228
229	/* compare here */
230	if (!bcmp(sp + sigofs, sig, siglen)) {
231	    /* convert back to physical address */
232	    return((u_int32_t)BIOS_VADDRTOPADDR(sp));
233	}
234	sp += paralen;
235    }
236    return(0);
237}
238
239/*
240 * do not staticize, used by bioscall.s
241 */
242union {
243    struct {
244	u_short	offset;
245	u_short	segment;
246    } vec16;
247    struct {
248	u_int	offset;
249	u_short	segment;
250    } vec32;
251} bioscall_vector;			/* bios jump vector */
252
253void
254set_bios_selectors(struct bios_segments *seg, int flags)
255{
256    struct soft_segment_descriptor ssd = {
257	0,			/* segment base address (overwritten) */
258	0,			/* length (overwritten) */
259	SDT_MEMERA,		/* segment type (overwritten) */
260	0,			/* priority level */
261	1,			/* descriptor present */
262	0, 0,
263	1,			/* descriptor size (overwritten) */
264	0			/* granularity == byte units */
265    };
266    union descriptor *p_gdt;
267
268#ifdef SMP
269    p_gdt = &gdt[PCPU_GET(cpuid) * NGDT];
270#else
271    p_gdt = gdt;
272#endif
273
274    ssd.ssd_base = seg->code32.base;
275    ssd.ssd_limit = seg->code32.limit;
276    ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd);
277
278    ssd.ssd_def32 = 0;
279    if (flags & BIOSCODE_FLAG) {
280	ssd.ssd_base = seg->code16.base;
281	ssd.ssd_limit = seg->code16.limit;
282	ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd);
283    }
284
285    ssd.ssd_type = SDT_MEMRWA;
286    if (flags & BIOSDATA_FLAG) {
287	ssd.ssd_base = seg->data.base;
288	ssd.ssd_limit = seg->data.limit;
289	ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd);
290    }
291
292    if (flags & BIOSUTIL_FLAG) {
293	ssd.ssd_base = seg->util.base;
294	ssd.ssd_limit = seg->util.limit;
295	ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd);
296    }
297
298    if (flags & BIOSARGS_FLAG) {
299	ssd.ssd_base = seg->args.base;
300	ssd.ssd_limit = seg->args.limit;
301	ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd);
302    }
303}
304
305extern int vm86pa;
306extern void bios16_jmp(void);
307
308/*
309 * this routine is really greedy with selectors, and uses 5:
310 *
311 * 32-bit code selector:	to return to kernel
312 * 16-bit code selector:	for running code
313 *        data selector:	for 16-bit data
314 *        util selector:	extra utility selector
315 *        args selector:	to handle pointers
316 *
317 * the util selector is set from the util16 entry in bios16_args, if a
318 * "U" specifier is seen.
319 *
320 * See <machine/pc/bios.h> for description of format specifiers
321 */
322int
323bios16(struct bios_args *args, char *fmt, ...)
324{
325    char	*p, *stack, *stack_top;
326    va_list 	ap;
327    int 	flags = BIOSCODE_FLAG | BIOSDATA_FLAG;
328    u_int 	i, arg_start, arg_end;
329    pt_entry_t	*pte;
330    pd_entry_t	*ptd;
331
332    arg_start = 0xffffffff;
333    arg_end = 0;
334
335    /*
336     * Some BIOS entrypoints attempt to copy the largest-case
337     * argument frame (in order to generalise handling for
338     * different entry types).  If our argument frame is
339     * smaller than this, the BIOS will reach off the top of
340     * our constructed stack segment.  Pad the top of the stack
341     * with some garbage to avoid this.
342     */
343    stack = (caddr_t)PAGE_SIZE - 32;
344
345    va_start(ap, fmt);
346    for (p = fmt; p && *p; p++) {
347	switch (*p) {
348	case 'p':			/* 32-bit pointer */
349	    i = va_arg(ap, u_int);
350	    arg_start = min(arg_start, i);
351	    arg_end = max(arg_end, i);
352	    flags |= BIOSARGS_FLAG;
353	    stack -= 4;
354	    break;
355
356	case 'i':			/* 32-bit integer */
357	    i = va_arg(ap, u_int);
358	    stack -= 4;
359	    break;
360
361	case 'U':			/* 16-bit selector */
362	    flags |= BIOSUTIL_FLAG;
363	    /* FALLTHROUGH */
364	case 'D':			/* 16-bit selector */
365	case 'C':			/* 16-bit selector */
366	    stack -= 2;
367	    break;
368
369	case 's':			/* 16-bit integer passed as an int */
370	    i = va_arg(ap, int);
371	    stack -= 2;
372	    break;
373
374	default:
375	    return (EINVAL);
376	}
377    }
378
379    if (flags & BIOSARGS_FLAG) {
380	if (arg_end - arg_start > ctob(16))
381	    return (EACCES);
382	args->seg.args.base = arg_start;
383	args->seg.args.limit = 0xffff;
384    }
385
386    args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME;
387    args->seg.code32.limit = 0xffff;
388
389    ptd = (pd_entry_t *)rcr3();
390#ifdef PAE
391    if (ptd == IdlePDPT)
392#else
393    if (ptd == IdlePTD)
394#endif
395    {
396	/*
397	 * no page table, so create one and install it.
398	 */
399	pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
400	ptd = (pd_entry_t *)((u_int)IdlePTD + KERNBASE);
401	*pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
402	*ptd = vtophys(pte) | PG_RW | PG_V;
403    } else {
404	/*
405	 * this is a user-level page table
406	 */
407	pte = PTmap;
408	*pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
409    }
410    pmap_invalidate_all(kernel_pmap);	/* XXX insurance for now */
411
412    stack_top = stack;
413    va_start(ap, fmt);
414    for (p = fmt; p && *p; p++) {
415	switch (*p) {
416	case 'p':			/* 32-bit pointer */
417	    i = va_arg(ap, u_int);
418	    *(u_int *)stack = (i - arg_start) |
419		(GSEL(GBIOSARGS_SEL, SEL_KPL) << 16);
420	    stack += 4;
421	    break;
422
423	case 'i':			/* 32-bit integer */
424	    i = va_arg(ap, u_int);
425	    *(u_int *)stack = i;
426	    stack += 4;
427	    break;
428
429	case 'U':			/* 16-bit selector */
430	    *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL);
431	    stack += 2;
432	    break;
433
434	case 'D':			/* 16-bit selector */
435	    *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL);
436	    stack += 2;
437	    break;
438
439	case 'C':			/* 16-bit selector */
440	    *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL);
441	    stack += 2;
442	    break;
443
444	case 's':			/* 16-bit integer passed as an int */
445	    i = va_arg(ap, int);
446	    *(u_short *)stack = i;
447	    stack += 2;
448	    break;
449
450	default:
451	    return (EINVAL);
452	}
453    }
454
455    set_bios_selectors(&args->seg, flags);
456    bioscall_vector.vec16.offset = (u_short)args->entry;
457    bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL);
458
459    i = bios16_call(&args->r, stack_top);
460
461    if (pte == PTmap) {
462	*pte = 0;			/* remove entry */
463	/*
464	 * XXX only needs to be invlpg(0) but that doesn't work on the 386
465	 */
466	pmap_invalidate_all(kernel_pmap);
467    } else {
468	*ptd = 0;			/* remove page table */
469	/*
470	 * XXX only needs to be invlpg(0) but that doesn't work on the 386
471	 */
472	pmap_invalidate_all(kernel_pmap);
473	free(pte, M_TEMP);		/* ... and free it */
474    }
475    return (i);
476}
477
478int
479bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen)
480{
481	size_t idx = 0;
482	struct bios_oem_signature *sig;
483	u_int from, to;
484	u_char c, *s, *se, *str, *bios_str;
485	size_t i, off, len, tot;
486
487	if ( !oem || !buffer || maxlen<2 )
488		return(-1);
489
490	sig = oem->signature;
491	if (!sig)
492		return(-2);
493
494	from = oem->range.from;
495	to = oem->range.to;
496	if ( (to<=from) || (from<BIOS_START) || (to>(BIOS_START+BIOS_SIZE)) )
497		return(-3);
498
499	while (sig->anchor != NULL) {
500		str = sig->anchor;
501		len = strlen(str);
502		off = sig->offset;
503		tot = sig->totlen;
504		/* make sure offset doesn't go beyond bios area */
505		if ( (to+off)>(BIOS_START+BIOS_SIZE) ||
506					((from+off)<BIOS_START) ) {
507			printf("sys/i386/i386/bios.c: sig '%s' "
508				"from 0x%0x to 0x%0x offset %d "
509				"out of BIOS bounds 0x%0x - 0x%0x\n",
510				str, from, to, off,
511				BIOS_START, BIOS_START+BIOS_SIZE);
512			return(-4);
513		}
514		/* make sure we don't overrun return buffer */
515		if (idx + tot > maxlen - 1) {
516			printf("sys/i386/i386/bios.c: sig '%s' "
517				"idx %d + tot %d = %d > maxlen-1 %d\n",
518				str, idx, tot, idx+tot, maxlen-1);
519			return(-5);
520		}
521		bios_str = NULL;
522		s = (u_char *)BIOS_PADDRTOVADDR(from);
523		se = (u_char *)BIOS_PADDRTOVADDR(to-len);
524		for (; s<se; s++) {
525			if (!bcmp(str, s, len)) {
526				bios_str = s;
527				break;
528			}
529		}
530		/*
531		*  store pretty version of totlen bytes of bios string with
532		*  given offset; 0x20 - 0x7E are printable; uniquify spaces
533		*/
534		if (bios_str) {
535			for (i=0; i<tot; i++) {
536				c = bios_str[i+off];
537				if ( (c < 0x20) || (c > 0x7E) )
538					c = ' ';
539				if (idx == 0) {
540					if (c != ' ')
541						buffer[idx++] = c;
542				} else if ( (c != ' ') ||
543					((c == ' ') && (buffer[idx-1] != ' ')) )
544						buffer[idx++] = c;
545			}
546		}
547		sig++;
548	}
549	/* remove a final trailing space */
550	if ( (idx > 1) && (buffer[idx-1] == ' ') )
551		idx--;
552	buffer[idx] = '\0';
553	return (idx);
554}
555
556#ifdef DEV_ISA
557/*
558 * PnP BIOS interface; enumerate devices only known to the system
559 * BIOS and save information about them for later use.
560 */
561
562struct pnp_sysdev
563{
564    u_int16_t	size;
565    u_int8_t	handle;
566    u_int32_t	devid;
567    u_int8_t	type[3];
568    u_int16_t	attrib;
569#define PNPATTR_NODISABLE	(1<<0)	/* can't be disabled */
570#define PNPATTR_NOCONFIG	(1<<1)	/* can't be configured */
571#define PNPATTR_OUTPUT		(1<<2)	/* can be primary output */
572#define PNPATTR_INPUT		(1<<3)	/* can be primary input */
573#define PNPATTR_BOOTABLE	(1<<4)	/* can be booted from */
574#define PNPATTR_DOCK		(1<<5)	/* is a docking station */
575#define PNPATTR_REMOVEABLE	(1<<6)	/* device is removeable */
576#define PNPATTR_CONFIG_STATIC	(0)
577#define PNPATTR_CONFIG_DYNAMIC	(1)
578#define PNPATTR_CONFIG_DYNONLY	(3)
579#define PNPATTR_CONFIG(a)	(((a) >> 7) & 0x3)
580    /* device-specific data comes here */
581    u_int8_t	devdata[0];
582} __packed;
583
584/* We have to cluster arguments within a 64k range for the bios16 call */
585struct pnp_sysdevargs
586{
587    u_int16_t	next;
588    struct pnp_sysdev node;
589};
590
591/*
592 * This function is called after the bus has assigned resource
593 * locations for a logical device.
594 */
595static void
596pnpbios_set_config(void *arg, struct isa_config *config, int enable)
597{
598}
599
600/*
601 * Quiz the PnP BIOS, build a list of PNP IDs and resource data.
602 */
603static void
604pnpbios_identify(driver_t *driver, device_t parent)
605{
606    struct PnPBIOS_table	*pt = PnPBIOStable;
607    struct bios_args		args;
608    struct pnp_sysdev		*pd;
609    struct pnp_sysdevargs	*pda;
610    u_int16_t			ndevs, bigdev;
611    int				error, currdev;
612    u_int8_t			*devnodebuf, tag;
613    u_int32_t			*devid, *compid;
614    int				idx, left;
615    device_t			dev;
616
617    /* no PnP BIOS information */
618    if (pt == NULL)
619	return;
620
621    /* Check to see if ACPI is already active. */
622    dev = devclass_get_device(devclass_find("acpi"), 0);
623    if (dev != NULL && device_is_attached(dev))
624	return;
625
626    /* get count of PnP devices */
627    bzero(&args, sizeof(args));
628    args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase);
629    args.seg.code16.limit = 0xffff;		/* XXX ? */
630    args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg);
631    args.seg.data.limit = 0xffff;
632    args.entry = pt->pmentryoffset;
633
634    if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) {
635	printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
636	return;
637    }
638    ndevs &= 0xff;				/* clear high byte garbage */
639    if (bootverbose)
640	printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
641
642    devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
643			M_DEVBUF, M_NOWAIT);
644    if (devnodebuf == NULL) {
645	printf("pnpbios: cannot allocate memory, bailing\n");
646	return;
647    }
648    pda = (struct pnp_sysdevargs *)devnodebuf;
649    pd = &pda->node;
650
651    for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) {
652
653	bzero(pd, bigdev);
654	pda->next = currdev;
655	/* get current configuration */
656	if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) {
657	    printf("pnpbios: error %d making BIOS16 call\n", error);
658	    break;
659	}
660	if ((error = (args.r.eax & 0xff))) {
661	    if (bootverbose)
662		printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev);
663	    if (error & 0x80)
664		break;
665	}
666	currdev = pda->next;
667	if (pd->size < sizeof(struct pnp_sysdev)) {
668	    printf("pnpbios: bogus system node data, aborting scan\n");
669	    break;
670	}
671
672	/*
673	 * Ignore PICs so that we don't have to worry about the PICs
674	 * claiming IRQs to prevent their use.  The PIC drivers
675	 * already ensure that invalid IRQs are not used.
676	 */
677	if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000"))	/* ISA PIC */
678	    continue;
679	if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003"))	/* APIC */
680	    continue;
681
682	/* Add the device and parse its resources */
683	dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNPBIOS, NULL, -1);
684	isa_set_vendorid(dev, pd->devid);
685	isa_set_logicalid(dev, pd->devid);
686	/*
687	 * It appears that some PnP BIOS doesn't allow us to re-enable
688	 * the embedded system device once it is disabled.  We shall
689	 * mark all system device nodes as "cannot be disabled", regardless
690	 * of actual settings in the device attribute byte.
691	 * XXX
692	isa_set_configattr(dev,
693	    ((pd->attrib & PNPATTR_NODISABLE) ?  0 : ISACFGATTR_CANDISABLE) |
694	    ((!(pd->attrib & PNPATTR_NOCONFIG) &&
695		PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
696		? ISACFGATTR_DYNAMIC : 0));
697	 */
698	isa_set_configattr(dev,
699	    (!(pd->attrib & PNPATTR_NOCONFIG) &&
700		PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
701		? ISACFGATTR_DYNAMIC : 0);
702	isa_set_pnpbios_handle(dev, pd->handle);
703	ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0);
704	pnp_parse_resources(dev, &pd->devdata[0],
705	    pd->size - sizeof(struct pnp_sysdev), 0);
706	if (!device_get_desc(dev))
707	    device_set_desc_copy(dev, pnp_eisaformat(pd->devid));
708
709	/* Find device IDs */
710	devid = &pd->devid;
711	compid = NULL;
712
713	/* look for a compatible device ID too */
714	left = pd->size - sizeof(struct pnp_sysdev);
715	idx = 0;
716	while (idx < left) {
717	    tag = pd->devdata[idx++];
718	    if (PNP_RES_TYPE(tag) == 0) {
719		/* Small resource */
720		switch (PNP_SRES_NUM(tag)) {
721		case PNP_TAG_COMPAT_DEVICE:
722		    compid = (u_int32_t *)(pd->devdata + idx);
723		    if (bootverbose)
724			printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid);
725		    /* FALLTHROUGH */
726		case PNP_TAG_END:
727		    idx = left;
728		    break;
729		default:
730		    idx += PNP_SRES_LEN(tag);
731		    break;
732		}
733	    } else
734		/* Large resource, skip it */
735		idx += *(u_int16_t *)(pd->devdata + idx) + 2;
736	}
737	if (bootverbose) {
738	    printf("pnpbios: handle %d device ID %s (%08x)",
739		   pd->handle, pnp_eisaformat(*devid), *devid);
740	    if (compid != NULL)
741		printf(" compat ID %s (%08x)",
742		       pnp_eisaformat(*compid), *compid);
743	    printf("\n");
744	}
745    }
746}
747
748static device_method_t pnpbios_methods[] = {
749	/* Device interface */
750	DEVMETHOD(device_identify,	pnpbios_identify),
751
752	{ 0, 0 }
753};
754
755static driver_t pnpbios_driver = {
756	"pnpbios",
757	pnpbios_methods,
758	1,			/* no softc */
759};
760
761static devclass_t pnpbios_devclass;
762
763DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0);
764#endif /* DEV_ISA */
765