2 * Copyright (c) 1997 Michael Smith
3 * Copyright (c) 1998 Jonathan Lemon
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
27 * $FreeBSD: src/sys/i386/i386/bios.c,v 1.29.2.3 2001/07/19 18:07:35 imp Exp $
28 * $DragonFly: src/sys/platform/pc32/i386/bios.c,v 1.2 2003/06/17 04:28:35 dillon Exp $
32 * Code for dealing with the BIOS in x86 PC systems.
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.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 #include <isa/pnpreg.h>
52 #include <isa/pnpvar.h>
54 #include <isa/isavar.h>
57 #define BIOS_START 0xe0000
58 #define BIOS_SIZE 0x20000
60 /* exported lookup results */
61 struct bios32_SDentry PCIbios = {entry : 0};
62 struct PnPBIOS_table *PnPBIOStable = 0;
64 static u_int bios32_SDCI = 0;
66 /* start fairly early */
67 static void bios32_init(void *junk);
68 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL);
73 * Locate various bios32 entities.
76 bios32_init(void *junk)
79 struct bios32_SDheader *sdh;
80 struct PnPBIOS_table *pt;
85 * BIOS32 Service Directory
88 /* look for the signature */
89 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) {
91 /* get a virtual pointer to the structure */
92 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
93 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) {
96 /* If checksum is OK, enable use of the entrypoint */
97 if ((ck == 0) && (sdh->entry < (BIOS_START + BIOS_SIZE))) {
98 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry);
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);
104 /* See if there's a PCI BIOS entrypoint here */
105 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */
106 if (!bios32_SDlookup(&PCIbios) && bootverbose)
107 printf("pcibios: PCI BIOS entry at 0x%x\n", PCIbios.entry);
109 printf("bios32: Bad BIOS32 Service Directory\n");
116 if ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0) {
118 /* get a virtual pointer to the structure */
119 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
120 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) {
123 /* If checksum is OK, enable use of the entrypoint */
127 printf("pnpbios: Found PnP BIOS data at %p\n", pt);
128 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n",
129 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf);
130 if ((pt->control & 0x3) == 0x01)
131 printf("pnpbios: Event flag at %x\n", pt->evflagaddr);
132 if (pt->oemdevid != 0)
133 printf("pnpbios: OEM ID %x\n", pt->oemdevid);
137 printf("pnpbios: Bad PnP BIOS data checksum\n");
142 /* look for other know signatures */
143 printf("Other BIOS signatures found:\n");
144 printf("ACPI: %08x\n", bios_sigsearch(0, "RSD PTR ", 8, 16, 0));
151 * Query the BIOS32 Service Directory for the service named in (ent),
152 * returns nonzero if the lookup fails. The caller must fill in
153 * (ent->ident), the remainder are populated on a successful lookup.
156 bios32_SDlookup(struct bios32_SDentry *ent)
158 struct bios_regs args;
160 if (bios32_SDCI == 0)
163 args.eax = ent->ident.id; /* set up arguments */
164 args.ebx = args.ecx = args.edx = 0;
165 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL));
166 if ((args.eax & 0xff) == 0) { /* success? */
167 ent->base = args.ebx;
169 ent->entry = args.edx;
170 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry);
171 return (0); /* all OK */
173 return (1); /* failed */
180 * Search some or all of the BIOS region for a signature string.
182 * (start) Optional offset returned from this function
183 * (for searching for multiple matches), or NULL
184 * to start the search from the base of the BIOS.
185 * Note that this will be a _physical_ address in
186 * the range 0xe0000 - 0xfffff.
187 * (sig) is a pointer to the byte(s) of the signature.
188 * (siglen) number of bytes in the signature.
189 * (paralen) signature paragraph (alignment) size.
190 * (sigofs) offset of the signature within the paragraph.
192 * Returns the _physical_ address of the found signature, 0 if the
193 * signature was not found.
197 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
201 /* compute the starting address */
202 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
203 sp = (char *)BIOS_PADDRTOVADDR(start);
204 } else if (start == 0) {
205 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
207 return 0; /* bogus start address */
210 /* compute the end address */
211 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
214 while ((sp + sigofs + siglen) < end) {
217 if (!bcmp(sp + sigofs, sig, siglen)) {
218 /* convert back to physical address */
219 return((u_int32_t)BIOS_VADDRTOPADDR(sp));
227 * do not staticize, used by bioscall.s
238 } bioscall_vector; /* bios jump vector */
241 set_bios_selectors(struct bios_segments *seg, int flags)
243 struct soft_segment_descriptor ssd = {
244 0, /* segment base address (overwritten) */
245 0, /* length (overwritten) */
246 SDT_MEMERA, /* segment type (overwritten) */
247 0, /* priority level */
248 1, /* descriptor present */
250 1, /* descriptor size (overwritten) */
251 0 /* granularity == byte units */
253 union descriptor *p_gdt;
256 p_gdt = &gdt[cpuid * NGDT];
261 ssd.ssd_base = seg->code32.base;
262 ssd.ssd_limit = seg->code32.limit;
263 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd);
266 if (flags & BIOSCODE_FLAG) {
267 ssd.ssd_base = seg->code16.base;
268 ssd.ssd_limit = seg->code16.limit;
269 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd);
272 ssd.ssd_type = SDT_MEMRWA;
273 if (flags & BIOSDATA_FLAG) {
274 ssd.ssd_base = seg->data.base;
275 ssd.ssd_limit = seg->data.limit;
276 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd);
279 if (flags & BIOSUTIL_FLAG) {
280 ssd.ssd_base = seg->util.base;
281 ssd.ssd_limit = seg->util.limit;
282 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd);
285 if (flags & BIOSARGS_FLAG) {
286 ssd.ssd_base = seg->args.base;
287 ssd.ssd_limit = seg->args.limit;
288 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd);
293 extern void bios16_jmp(void);
296 * this routine is really greedy with selectors, and uses 5:
298 * 32-bit code selector: to return to kernel
299 * 16-bit code selector: for running code
300 * data selector: for 16-bit data
301 * util selector: extra utility selector
302 * args selector: to handle pointers
304 * the util selector is set from the util16 entry in bios16_args, if a
305 * "U" specifier is seen.
307 * See <machine/pc/bios.h> for description of format specifiers
310 bios16(struct bios_args *args, char *fmt, ...)
312 char *p, *stack, *stack_top;
314 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG;
315 u_int i, arg_start, arg_end;
318 arg_start = 0xffffffff;
322 * Some BIOS entrypoints attempt to copy the largest-case
323 * argument frame (in order to generalise handling for
324 * different entry types). If our argument frame is
325 * smaller than this, the BIOS will reach off the top of
326 * our constructed stack segment. Pad the top of the stack
327 * with some garbage to avoid this.
329 stack = (caddr_t)PAGE_SIZE - 32;
332 for (p = fmt; p && *p; p++) {
334 case 'p': /* 32-bit pointer */
335 i = va_arg(ap, u_int);
336 arg_start = min(arg_start, i);
337 arg_end = max(arg_end, i);
338 flags |= BIOSARGS_FLAG;
342 case 'i': /* 32-bit integer */
343 i = va_arg(ap, u_int);
347 case 'U': /* 16-bit selector */
348 flags |= BIOSUTIL_FLAG;
350 case 'D': /* 16-bit selector */
351 case 'C': /* 16-bit selector */
355 case 's': /* 16-bit integer */
356 i = va_arg(ap, u_short);
365 if (flags & BIOSARGS_FLAG) {
366 if (arg_end - arg_start > ctob(16))
368 args->seg.args.base = arg_start;
369 args->seg.args.limit = 0xffff;
372 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME;
373 args->seg.code32.limit = 0xffff;
375 ptd = (u_int *)rcr3();
376 if (ptd == IdlePTD) {
378 * no page table, so create one and install it.
380 pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
381 ptd = (u_int *)((u_int)ptd + KERNBASE);
382 *ptd = vtophys(pte) | PG_RW | PG_V;
385 * this is a user-level page table
387 pte = (u_int *)&PTmap;
390 * install pointer to page 0. we don't need to flush the tlb,
391 * since there should not be a previous mapping for page 0.
393 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
397 for (p = fmt; p && *p; p++) {
399 case 'p': /* 32-bit pointer */
400 i = va_arg(ap, u_int);
401 *(u_int *)stack = (i - arg_start) |
402 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16);
406 case 'i': /* 32-bit integer */
407 i = va_arg(ap, u_int);
412 case 'U': /* 16-bit selector */
413 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL);
417 case 'D': /* 16-bit selector */
418 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL);
422 case 'C': /* 16-bit selector */
423 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL);
427 case 's': /* 16-bit integer */
428 i = va_arg(ap, u_short);
429 *(u_short *)stack = i;
438 set_bios_selectors(&args->seg, flags);
439 bioscall_vector.vec16.offset = (u_short)args->entry;
440 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL);
442 i = bios16_call(&args->r, stack_top);
444 if (pte == (u_int *)&PTmap) {
445 *pte = 0; /* remove entry */
447 *ptd = 0; /* remove page table */
448 free(pte, M_TEMP); /* ... and free it */
452 * XXX only needs to be invlpg(0) but that doesn't work on the 386
459 #ifdef PNPBIOS /* remove conditional later */
462 * PnP BIOS interface; enumerate devices only known to the system
463 * BIOS and save information about them for later use.
473 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */
474 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */
475 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */
476 #define PNPATTR_INPUT (1<<3) /* can be primary input */
477 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */
478 #define PNPATTR_DOCK (1<<5) /* is a docking station */
479 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */
480 #define PNPATTR_CONFIG_STATIC 0x00
481 #define PNPATTR_CONFIG_DYNAMIC 0x07
482 #define PNPATTR_CONFIG_DYNONLY 0x17
483 /* device-specific data comes here */
485 } __attribute__ ((packed));
487 /* We have to cluster arguments within a 64k range for the bios16 call */
488 struct pnp_sysdevargs
491 struct pnp_sysdev node;
495 * This function is called after the bus has assigned resource
496 * locations for a logical device.
499 pnpbios_set_config(void *arg, struct isa_config *config, int enable)
504 * Quiz the PnP BIOS, build a list of PNP IDs and resource data.
507 pnpbios_identify(driver_t *driver, device_t parent)
509 struct PnPBIOS_table *pt = PnPBIOStable;
510 struct bios_args args;
511 struct pnp_sysdev *pd;
512 struct pnp_sysdevargs *pda;
513 u_int16_t ndevs, bigdev;
515 u_int8_t *devnodebuf, tag;
516 u_int32_t *devid, *compid;
520 /* no PnP BIOS information */
524 bzero(&args, sizeof(args));
525 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase);
526 args.seg.code16.limit = 0xffff; /* XXX ? */
527 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg);
528 args.seg.data.limit = 0xffff;
529 args.entry = pt->pmentryoffset;
531 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff))
532 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
533 ndevs &= 0xff; /* clear high byte garbage */
535 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
537 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
539 pda = (struct pnp_sysdevargs *)devnodebuf;
542 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) {
546 /* get current configuration */
547 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) {
548 printf("pnpbios: error %d making BIOS16 call\n", error);
551 if ((error = (args.r.eax & 0xff))) {
553 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev);
558 if (pd->size < sizeof(struct pnp_sysdev)) {
559 printf("pnpbios: bogus system node data, aborting scan\n");
564 * If we are in APIC_IO mode, we should ignore the ISA PIC if it
565 * shows up. Likewise, in !APIC_IO mode, we should ignore the
566 * APIC (less important).
567 * This is significant because the ISA PIC will claim IRQ 2 (which
568 * it uses for chaining), while in APIC mode this is a valid IRQ
569 * available for general use.
572 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */
575 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */
579 /* Add the device and parse its resources */
580 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
581 isa_set_vendorid(dev, pd->devid);
582 isa_set_logicalid(dev, pd->devid);
583 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0);
584 pnp_parse_resources(dev, &pd->devdata[0],
585 pd->size - sizeof(struct pnp_sysdev));
586 if (!device_get_desc(dev))
587 device_set_desc_copy(dev, pnp_eisaformat(pd->devid));
589 /* Find device IDs */
593 /* look for a compatible device ID too */
594 left = pd->size - sizeof(struct pnp_sysdev);
597 tag = pd->devdata[idx++];
598 if (PNP_RES_TYPE(tag) == 0) {
600 switch (PNP_SRES_NUM(tag)) {
601 case PNP_TAG_COMPAT_DEVICE:
602 compid = (u_int32_t *)(pd->devdata + idx);
604 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid);
610 idx += PNP_SRES_LEN(tag);
614 /* Large resource, skip it */
615 idx += *(u_int16_t *)(pd->devdata + idx) + 2;
618 printf("pnpbios: handle %d device ID %s (%08x)",
619 pd->handle, pnp_eisaformat(*devid), *devid);
621 printf(" compat ID %s (%08x)",
622 pnp_eisaformat(*compid), *compid);
628 static device_method_t pnpbios_methods[] = {
629 /* Device interface */
630 DEVMETHOD(device_identify, pnpbios_identify),
635 static driver_t pnpbios_driver = {
641 static devclass_t pnpbios_devclass;
643 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0);