1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1997 Michael Smith
5 * Copyright (c) 1998 Jonathan Lemon
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT 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 * 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	/* get a virtual pointer to the structure */
93	sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
94	for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) {
95	    ck += cv[i];
96	}
97	/* If checksum is OK, enable use of the entrypoint */
98	if ((ck == 0) && (BIOS_START <= sdh->entry ) &&
99	    (sdh->entry < (BIOS_START + BIOS_SIZE))) {
100	    bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry);
101	    if (bootverbose) {
102		printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh);
103		printf("bios32: Entry = 0x%x (%x)  Rev = %d  Len = %d\n",
104		       sdh->entry, bios32_SDCI, sdh->revision, sdh->len);
105	    }
106
107	    /* Allow user override of PCI BIOS search */
108	    if (((p = kern_getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) {
109		/* See if there's a PCI BIOS entrypoint here */
110		PCIbios.ident.id = 0x49435024;	/* PCI systems should have this */
111		if (!bios32_SDlookup(&PCIbios) && bootverbose)
112		    printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry);
113	    }
114	    if (p != NULL)
115		    freeenv(p);
116	} else {
117	    printf("bios32: Bad BIOS32 Service Directory\n");
118	}
119    }
120
121    /*
122     * PnP BIOS
123     *
124     * Allow user override of PnP BIOS search
125     */
126    if ((((p = kern_getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) &&
127	((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) {
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 */
165int
166bios32_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 * bios_sigsearch
188 *
189 * Search some or all of the BIOS region for a signature string.
190 *
191 * (start)	Optional offset returned from this function
192 *		(for searching for multiple matches), or NULL
193 *		to start the search from the base of the BIOS.
194 *		Note that this will be a _physical_ address in
195 *		the range 0xe0000 - 0xfffff.
196 * (sig)	is a pointer to the byte(s) of the signature.
197 * (siglen)	number of bytes in the signature.
198 * (paralen)	signature paragraph (alignment) size.
199 * (sigofs)	offset of the signature within the paragraph.
200 *
201 * Returns the _physical_ address of the found signature, 0 if the
202 * signature was not found.
203 */
204
205u_int32_t
206bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
207{
208    u_char	*sp, *end;
209
210    /* compute the starting address */
211    if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
212	sp = (char *)BIOS_PADDRTOVADDR(start);
213    } else if (start == 0) {
214	sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
215    } else {
216	return 0;				/* bogus start address */
217    }
218
219    /* compute the end address */
220    end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
221
222    /* loop searching */
223    while ((sp + sigofs + siglen) < end) {
224	/* compare here */
225	if (!bcmp(sp + sigofs, sig, siglen)) {
226	    /* convert back to physical address */
227	    return((u_int32_t)BIOS_VADDRTOPADDR(sp));
228	}
229	sp += paralen;
230    }
231    return(0);
232}
233
234/*
235 * do not staticize, used by bioscall.s
236 */
237union {
238    struct {
239	u_short	offset;
240	u_short	segment;
241    } vec16;
242    struct {
243	u_int	offset;
244	u_short	segment;
245    } vec32;
246} bioscall_vector;			/* bios jump vector */
247
248void
249set_bios_selectors(struct bios_segments *seg, int flags)
250{
251    struct soft_segment_descriptor ssd = {
252	0,			/* segment base address (overwritten) */
253	0,			/* length (overwritten) */
254	SDT_MEMERA,		/* segment type (overwritten) */
255	0,			/* priority level */
256	1,			/* descriptor present */
257	0, 0,
258	1,			/* descriptor size (overwritten) */
259	0			/* granularity == byte units */
260    };
261    union descriptor *p_gdt;
262
263#ifdef SMP
264    p_gdt = &gdt[PCPU_GET(cpuid) * NGDT];
265#else
266    p_gdt = gdt;
267#endif
268
269    ssd.ssd_base = seg->code32.base;
270    ssd.ssd_limit = seg->code32.limit;
271    ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd);
272
273    ssd.ssd_def32 = 0;
274    if (flags & BIOSCODE_FLAG) {
275	ssd.ssd_base = seg->code16.base;
276	ssd.ssd_limit = seg->code16.limit;
277	ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd);
278    }
279
280    ssd.ssd_type = SDT_MEMRWA;
281    if (flags & BIOSDATA_FLAG) {
282	ssd.ssd_base = seg->data.base;
283	ssd.ssd_limit = seg->data.limit;
284	ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd);
285    }
286
287    if (flags & BIOSUTIL_FLAG) {
288	ssd.ssd_base = seg->util.base;
289	ssd.ssd_limit = seg->util.limit;
290	ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd);
291    }
292
293    if (flags & BIOSARGS_FLAG) {
294	ssd.ssd_base = seg->args.base;
295	ssd.ssd_limit = seg->args.limit;
296	ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd);
297    }
298}
299
300extern int vm86pa;
301extern u_long vm86phystk;
302extern void bios16_jmp(void);
303
304/*
305 * this routine is really greedy with selectors, and uses 5:
306 *
307 * 32-bit code selector:	to return to kernel
308 * 16-bit code selector:	for running code
309 *        data selector:	for 16-bit data
310 *        util selector:	extra utility selector
311 *        args selector:	to handle pointers
312 *
313 * the util selector is set from the util16 entry in bios16_args, if a
314 * "U" specifier is seen.
315 *
316 * See <machine/pc/bios.h> for description of format specifiers
317 */
318int
319bios16(struct bios_args *args, char *fmt, ...)
320{
321    char	*p, *stack, *stack_top;
322    va_list 	ap;
323    int 	flags = BIOSCODE_FLAG | BIOSDATA_FLAG;
324    u_int 	i, arg_start, arg_end;
325    void	*bios16_pmap_handle;
326    arg_start = 0xffffffff;
327    arg_end = 0;
328
329    /*
330     * Some BIOS entrypoints attempt to copy the largest-case
331     * argument frame (in order to generalise handling for
332     * different entry types).  If our argument frame is
333     * smaller than this, the BIOS will reach off the top of
334     * our constructed stack segment.  Pad the top of the stack
335     * with some garbage to avoid this.
336     */
337    stack = (caddr_t)PAGE_SIZE - 32;
338
339    va_start(ap, fmt);
340    for (p = fmt; p && *p; p++) {
341	switch (*p) {
342	case 'p':			/* 32-bit pointer */
343	    i = va_arg(ap, u_int);
344	    arg_start = min(arg_start, i);
345	    arg_end = max(arg_end, i);
346	    flags |= BIOSARGS_FLAG;
347	    stack -= 4;
348	    break;
349
350	case 'i':			/* 32-bit integer */
351	    i = va_arg(ap, u_int);
352	    stack -= 4;
353	    break;
354
355	case 'U':			/* 16-bit selector */
356	    flags |= BIOSUTIL_FLAG;
357	    /* FALLTHROUGH */
358	case 'D':			/* 16-bit selector */
359	case 'C':			/* 16-bit selector */
360	    stack -= 2;
361	    break;
362
363	case 's':			/* 16-bit integer passed as an int */
364	    i = va_arg(ap, int);
365	    stack -= 2;
366	    break;
367
368	default:
369	    va_end(ap);
370	    return (EINVAL);
371	}
372    }
373    va_end(ap);
374
375    if (flags & BIOSARGS_FLAG) {
376	if (arg_end - arg_start > ctob(16))
377	    return (EACCES);
378	args->seg.args.base = arg_start;
379	args->seg.args.limit = 0xffff;
380    }
381
382    args->seg.code32.base = pmap_pg_frame((u_int)&bios16_jmp);
383    args->seg.code32.limit = 0xffff;
384
385    bios16_pmap_handle = pmap_bios16_enter();
386
387    stack_top = stack;
388    va_start(ap, fmt);
389    for (p = fmt; p && *p; p++) {
390	switch (*p) {
391	case 'p':			/* 32-bit pointer */
392	    i = va_arg(ap, u_int);
393	    *(u_int *)stack = (i - arg_start) |
394		(GSEL(GBIOSARGS_SEL, SEL_KPL) << 16);
395	    stack += 4;
396	    break;
397
398	case 'i':			/* 32-bit integer */
399	    i = va_arg(ap, u_int);
400	    *(u_int *)stack = i;
401	    stack += 4;
402	    break;
403
404	case 'U':			/* 16-bit selector */
405	    *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL);
406	    stack += 2;
407	    break;
408
409	case 'D':			/* 16-bit selector */
410	    *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL);
411	    stack += 2;
412	    break;
413
414	case 'C':			/* 16-bit selector */
415	    *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL);
416	    stack += 2;
417	    break;
418
419	case 's':			/* 16-bit integer passed as an int */
420	    i = va_arg(ap, int);
421	    *(u_short *)stack = i;
422	    stack += 2;
423	    break;
424
425	default:
426	    va_end(ap);
427	    return (EINVAL);
428	}
429    }
430    va_end(ap);
431
432    set_bios_selectors(&args->seg, flags);
433    bioscall_vector.vec16.offset = (u_short)args->entry;
434    bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL);
435
436    i = bios16_call(&args->r, stack_top);
437    pmap_bios16_leave(bios16_pmap_handle);
438    return (i);
439}
440
441int
442bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen)
443{
444	size_t idx = 0;
445	struct bios_oem_signature *sig;
446	u_int from, to;
447	u_char c, *s, *se, *str, *bios_str;
448	size_t i, off, len, tot;
449
450	if ( !oem || !buffer || maxlen<2 )
451		return(-1);
452
453	sig = oem->signature;
454	if (!sig)
455		return(-2);
456
457	from = oem->range.from;
458	to = oem->range.to;
459	if ( (to<=from) || (from<BIOS_START) || (to>(BIOS_START+BIOS_SIZE)) )
460		return(-3);
461
462	while (sig->anchor != NULL) {
463		str = sig->anchor;
464		len = strlen(str);
465		off = sig->offset;
466		tot = sig->totlen;
467		/* make sure offset doesn't go beyond bios area */
468		if ( (to+off)>(BIOS_START+BIOS_SIZE) ||
469					((from+off)<BIOS_START) ) {
470			printf("sys/i386/i386/bios.c: sig '%s' "
471				"from 0x%0x to 0x%0x offset %d "
472				"out of BIOS bounds 0x%0x - 0x%0x\n",
473				str, from, to, off,
474				BIOS_START, BIOS_START+BIOS_SIZE);
475			return(-4);
476		}
477		/* make sure we don't overrun return buffer */
478		if (idx + tot > maxlen - 1) {
479			printf("sys/i386/i386/bios.c: sig '%s' "
480				"idx %d + tot %d = %d > maxlen-1 %d\n",
481				str, idx, tot, idx+tot, maxlen-1);
482			return(-5);
483		}
484		bios_str = NULL;
485		s = (u_char *)BIOS_PADDRTOVADDR(from);
486		se = (u_char *)BIOS_PADDRTOVADDR(to-len);
487		for (; s<se; s++) {
488			if (!bcmp(str, s, len)) {
489				bios_str = s;
490				break;
491			}
492		}
493		/*
494		*  store pretty version of totlen bytes of bios string with
495		*  given offset; 0x20 - 0x7E are printable; uniquify spaces
496		*/
497		if (bios_str) {
498			for (i=0; i<tot; i++) {
499				c = bios_str[i+off];
500				if ( (c < 0x20) || (c > 0x7E) )
501					c = ' ';
502				if (idx == 0) {
503					if (c != ' ')
504						buffer[idx++] = c;
505				} else if ( (c != ' ') ||
506					((c == ' ') && (buffer[idx-1] != ' ')) )
507						buffer[idx++] = c;
508			}
509		}
510		sig++;
511	}
512	/* remove a final trailing space */
513	if ( (idx > 1) && (buffer[idx-1] == ' ') )
514		idx--;
515	buffer[idx] = '\0';
516	return (idx);
517}
518
519#ifdef DEV_ISA
520/*
521 * PnP BIOS interface; enumerate devices only known to the system
522 * BIOS and save information about them for later use.
523 */
524
525struct pnp_sysdev
526{
527    u_int16_t	size;
528    u_int8_t	handle;
529    u_int32_t	devid;
530    u_int8_t	type[3];
531    u_int16_t	attrib;
532#define PNPATTR_NODISABLE	(1<<0)	/* can't be disabled */
533#define PNPATTR_NOCONFIG	(1<<1)	/* can't be configured */
534#define PNPATTR_OUTPUT		(1<<2)	/* can be primary output */
535#define PNPATTR_INPUT		(1<<3)	/* can be primary input */
536#define PNPATTR_BOOTABLE	(1<<4)	/* can be booted from */
537#define PNPATTR_DOCK		(1<<5)	/* is a docking station */
538#define PNPATTR_REMOVEABLE	(1<<6)	/* device is removeable */
539#define PNPATTR_CONFIG_STATIC	(0)
540#define PNPATTR_CONFIG_DYNAMIC	(1)
541#define PNPATTR_CONFIG_DYNONLY	(3)
542#define PNPATTR_CONFIG(a)	(((a) >> 7) & 0x3)
543    /* device-specific data comes here */
544    u_int8_t	devdata[0];
545} __packed;
546
547/* We have to cluster arguments within a 64k range for the bios16 call */
548struct pnp_sysdevargs
549{
550    u_int16_t	next;
551    struct pnp_sysdev node;
552};
553
554/*
555 * This function is called after the bus has assigned resource
556 * locations for a logical device.
557 */
558static void
559pnpbios_set_config(void *arg, struct isa_config *config, int enable)
560{
561}
562
563/*
564 * Quiz the PnP BIOS, build a list of PNP IDs and resource data.
565 */
566static void
567pnpbios_identify(driver_t *driver, device_t parent)
568{
569    struct PnPBIOS_table	*pt = PnPBIOStable;
570    struct bios_args		args;
571    struct pnp_sysdev		*pd;
572    struct pnp_sysdevargs	*pda;
573    u_int16_t			ndevs, bigdev;
574    int				error, currdev;
575    u_int8_t			*devnodebuf, tag;
576    u_int32_t			*devid, *compid;
577    int				idx, left;
578    device_t			dev;
579
580    /* no PnP BIOS information */
581    if (pt == NULL)
582	return;
583
584    /* Check to see if ACPI is already active. */
585    dev = devclass_get_device(devclass_find("acpi"), 0);
586    if (dev != NULL && device_is_attached(dev))
587	return;
588
589    /* get count of PnP devices */
590    bzero(&args, sizeof(args));
591    args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase);
592    args.seg.code16.limit = 0xffff;		/* XXX ? */
593    args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg);
594    args.seg.data.limit = 0xffff;
595    args.entry = pt->pmentryoffset;
596
597    if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) {
598	printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
599	return;
600    }
601    ndevs &= 0xff;				/* clear high byte garbage */
602    if (bootverbose)
603	printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
604
605    devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
606			M_DEVBUF, M_NOWAIT);
607    if (devnodebuf == NULL) {
608	printf("pnpbios: cannot allocate memory, bailing\n");
609	return;
610    }
611    pda = (struct pnp_sysdevargs *)devnodebuf;
612    pd = &pda->node;
613
614    for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) {
615	bzero(pd, bigdev);
616	pda->next = currdev;
617	/* get current configuration */
618	if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) {
619	    printf("pnpbios: error %d making BIOS16 call\n", error);
620	    break;
621	}
622	if ((error = (args.r.eax & 0xff))) {
623	    if (bootverbose)
624		printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev);
625	    if (error & 0x80)
626		break;
627	}
628	currdev = pda->next;
629	if (pd->size < sizeof(struct pnp_sysdev)) {
630	    printf("pnpbios: bogus system node data, aborting scan\n");
631	    break;
632	}
633
634	/*
635	 * Ignore PICs so that we don't have to worry about the PICs
636	 * claiming IRQs to prevent their use.  The PIC drivers
637	 * already ensure that invalid IRQs are not used.
638	 */
639	if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000"))	/* ISA PIC */
640	    continue;
641	if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003"))	/* APIC */
642	    continue;
643
644	/* Add the device and parse its resources */
645	dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNPBIOS, NULL, -1);
646	isa_set_vendorid(dev, pd->devid);
647	isa_set_logicalid(dev, pd->devid);
648	/*
649	 * It appears that some PnP BIOS doesn't allow us to re-enable
650	 * the embedded system device once it is disabled.  We shall
651	 * mark all system device nodes as "cannot be disabled", regardless
652	 * of actual settings in the device attribute byte.
653	 * XXX
654	isa_set_configattr(dev,
655	    ((pd->attrib & PNPATTR_NODISABLE) ?  0 : ISACFGATTR_CANDISABLE) |
656	    ((!(pd->attrib & PNPATTR_NOCONFIG) &&
657		PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
658		? ISACFGATTR_DYNAMIC : 0));
659	 */
660	isa_set_configattr(dev,
661	    (!(pd->attrib & PNPATTR_NOCONFIG) &&
662		PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
663		? ISACFGATTR_DYNAMIC : 0);
664	isa_set_pnpbios_handle(dev, pd->handle);
665	ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0);
666	pnp_parse_resources(dev, &pd->devdata[0],
667	    pd->size - sizeof(struct pnp_sysdev), 0);
668	if (!device_get_desc(dev))
669	    device_set_desc_copy(dev, pnp_eisaformat(pd->devid));
670
671	/* Find device IDs */
672	devid = &pd->devid;
673	compid = NULL;
674
675	/* look for a compatible device ID too */
676	left = pd->size - sizeof(struct pnp_sysdev);
677	idx = 0;
678	while (idx < left) {
679	    tag = pd->devdata[idx++];
680	    if (PNP_RES_TYPE(tag) == 0) {
681		/* Small resource */
682		switch (PNP_SRES_NUM(tag)) {
683		case PNP_TAG_COMPAT_DEVICE:
684		    compid = (u_int32_t *)(pd->devdata + idx);
685		    if (bootverbose)
686			printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid);
687		    /* FALLTHROUGH */
688		case PNP_TAG_END:
689		    idx = left;
690		    break;
691		default:
692		    idx += PNP_SRES_LEN(tag);
693		    break;
694		}
695	    } else
696		/* Large resource, skip it */
697		idx += *(u_int16_t *)(pd->devdata + idx) + 2;
698	}
699	if (bootverbose) {
700	    printf("pnpbios: handle %d device ID %s (%08x)",
701		   pd->handle, pnp_eisaformat(*devid), *devid);
702	    if (compid != NULL)
703		printf(" compat ID %s (%08x)",
704		       pnp_eisaformat(*compid), *compid);
705	    printf("\n");
706	}
707    }
708}
709
710static device_method_t pnpbios_methods[] = {
711	/* Device interface */
712	DEVMETHOD(device_identify,	pnpbios_identify),
713	{ 0, 0 }
714};
715
716static driver_t pnpbios_driver = {
717	"pnpbios",
718	pnpbios_methods,
719	1,			/* no softc */
720};
721
722DRIVER_MODULE(pnpbios, isa, pnpbios_driver, 0, 0);
723#endif /* DEV_ISA */
724