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 $
31 * Code for dealing with the BIOS in x86 PC systems.
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/malloc.h>
45 #include <machine/md_var.h>
46 #include <machine/segments.h>
47 #include <machine/stdarg.h>
48 #include <machine/vmparam.h>
49 #include <machine/pc/bios.h>
50 #include <isa/pnpreg.h>
51 #include <isa/pnpvar.h>
53 #include <isa/isavar.h>
56 #define BIOS_START 0xe0000
57 #define BIOS_SIZE 0x20000
59 /* exported lookup results */
60 struct bios32_SDentry PCIbios = {entry : 0};
61 struct PnPBIOS_table *PnPBIOStable = 0;
63 static u_int bios32_SDCI = 0;
65 /* start fairly early */
66 static void bios32_init(void *junk);
67 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL);
72 * Locate various bios32 entities.
75 bios32_init(void *junk)
78 struct bios32_SDheader *sdh;
79 struct PnPBIOS_table *pt;
84 * BIOS32 Service Directory
87 /* look for the signature */
88 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) {
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++) {
95 /* If checksum is OK, enable use of the entrypoint */
96 if ((ck == 0) && (sdh->entry < (BIOS_START + BIOS_SIZE))) {
97 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry);
99 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh);
100 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n",
101 sdh->entry, bios32_SDCI, sdh->revision, sdh->len);
103 /* See if there's a PCI BIOS entrypoint here */
104 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */
105 if (!bios32_SDlookup(&PCIbios) && bootverbose)
106 printf("pcibios: PCI BIOS entry at 0x%x\n", PCIbios.entry);
108 printf("bios32: Bad BIOS32 Service Directory\n");
115 if ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0) {
117 /* get a virtual pointer to the structure */
118 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
119 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) {
122 /* If checksum is OK, enable use of the entrypoint */
126 printf("pnpbios: Found PnP BIOS data at %p\n", pt);
127 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n",
128 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf);
129 if ((pt->control & 0x3) == 0x01)
130 printf("pnpbios: Event flag at %x\n", pt->evflagaddr);
131 if (pt->oemdevid != 0)
132 printf("pnpbios: OEM ID %x\n", pt->oemdevid);
136 printf("pnpbios: Bad PnP BIOS data checksum\n");
141 /* look for other know signatures */
142 printf("Other BIOS signatures found:\n");
143 printf("ACPI: %08x\n", bios_sigsearch(0, "RSD PTR ", 8, 16, 0));
150 * Query the BIOS32 Service Directory for the service named in (ent),
151 * returns nonzero if the lookup fails. The caller must fill in
152 * (ent->ident), the remainder are populated on a successful lookup.
155 bios32_SDlookup(struct bios32_SDentry *ent)
157 struct bios_regs args;
159 if (bios32_SDCI == 0)
162 args.eax = ent->ident.id; /* set up arguments */
163 args.ebx = args.ecx = args.edx = 0;
164 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL));
165 if ((args.eax & 0xff) == 0) { /* success? */
166 ent->base = args.ebx;
168 ent->entry = args.edx;
169 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry);
170 return (0); /* all OK */
172 return (1); /* failed */
179 * Search some or all of the BIOS region for a signature string.
181 * (start) Optional offset returned from this function
182 * (for searching for multiple matches), or NULL
183 * to start the search from the base of the BIOS.
184 * Note that this will be a _physical_ address in
185 * the range 0xe0000 - 0xfffff.
186 * (sig) is a pointer to the byte(s) of the signature.
187 * (siglen) number of bytes in the signature.
188 * (paralen) signature paragraph (alignment) size.
189 * (sigofs) offset of the signature within the paragraph.
191 * Returns the _physical_ address of the found signature, 0 if the
192 * signature was not found.
196 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
200 /* compute the starting address */
201 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
202 sp = (char *)BIOS_PADDRTOVADDR(start);
203 } else if (start == 0) {
204 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
206 return 0; /* bogus start address */
209 /* compute the end address */
210 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
213 while ((sp + sigofs + siglen) < end) {
216 if (!bcmp(sp + sigofs, sig, siglen)) {
217 /* convert back to physical address */
218 return((u_int32_t)BIOS_VADDRTOPADDR(sp));
226 * do not staticize, used by bioscall.s
237 } bioscall_vector; /* bios jump vector */
240 set_bios_selectors(struct bios_segments *seg, int flags)
242 struct soft_segment_descriptor ssd = {
243 0, /* segment base address (overwritten) */
244 0, /* length (overwritten) */
245 SDT_MEMERA, /* segment type (overwritten) */
246 0, /* priority level */
247 1, /* descriptor present */
249 1, /* descriptor size (overwritten) */
250 0 /* granularity == byte units */
252 union descriptor *p_gdt;
255 p_gdt = &gdt[cpuid * NGDT];
260 ssd.ssd_base = seg->code32.base;
261 ssd.ssd_limit = seg->code32.limit;
262 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd);
265 if (flags & BIOSCODE_FLAG) {
266 ssd.ssd_base = seg->code16.base;
267 ssd.ssd_limit = seg->code16.limit;
268 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd);
271 ssd.ssd_type = SDT_MEMRWA;
272 if (flags & BIOSDATA_FLAG) {
273 ssd.ssd_base = seg->data.base;
274 ssd.ssd_limit = seg->data.limit;
275 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd);
278 if (flags & BIOSUTIL_FLAG) {
279 ssd.ssd_base = seg->util.base;
280 ssd.ssd_limit = seg->util.limit;
281 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd);
284 if (flags & BIOSARGS_FLAG) {
285 ssd.ssd_base = seg->args.base;
286 ssd.ssd_limit = seg->args.limit;
287 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd);
292 extern void bios16_jmp(void);
295 * this routine is really greedy with selectors, and uses 5:
297 * 32-bit code selector: to return to kernel
298 * 16-bit code selector: for running code
299 * data selector: for 16-bit data
300 * util selector: extra utility selector
301 * args selector: to handle pointers
303 * the util selector is set from the util16 entry in bios16_args, if a
304 * "U" specifier is seen.
306 * See <machine/pc/bios.h> for description of format specifiers
309 bios16(struct bios_args *args, char *fmt, ...)
311 char *p, *stack, *stack_top;
313 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG;
314 u_int i, arg_start, arg_end;
317 arg_start = 0xffffffff;
321 * Some BIOS entrypoints attempt to copy the largest-case
322 * argument frame (in order to generalise handling for
323 * different entry types). If our argument frame is
324 * smaller than this, the BIOS will reach off the top of
325 * our constructed stack segment. Pad the top of the stack
326 * with some garbage to avoid this.
328 stack = (caddr_t)PAGE_SIZE - 32;
331 for (p = fmt; p && *p; p++) {
333 case 'p': /* 32-bit pointer */
334 i = va_arg(ap, u_int);
335 arg_start = min(arg_start, i);
336 arg_end = max(arg_end, i);
337 flags |= BIOSARGS_FLAG;
341 case 'i': /* 32-bit integer */
342 i = va_arg(ap, u_int);
346 case 'U': /* 16-bit selector */
347 flags |= BIOSUTIL_FLAG;
349 case 'D': /* 16-bit selector */
350 case 'C': /* 16-bit selector */
354 case 's': /* 16-bit integer */
355 i = va_arg(ap, u_short);
364 if (flags & BIOSARGS_FLAG) {
365 if (arg_end - arg_start > ctob(16))
367 args->seg.args.base = arg_start;
368 args->seg.args.limit = 0xffff;
371 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME;
372 args->seg.code32.limit = 0xffff;
374 ptd = (u_int *)rcr3();
375 if (ptd == IdlePTD) {
377 * no page table, so create one and install it.
379 pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
380 ptd = (u_int *)((u_int)ptd + KERNBASE);
381 *ptd = vtophys(pte) | PG_RW | PG_V;
384 * this is a user-level page table
386 pte = (u_int *)&PTmap;
389 * install pointer to page 0. we don't need to flush the tlb,
390 * since there should not be a previous mapping for page 0.
392 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
396 for (p = fmt; p && *p; p++) {
398 case 'p': /* 32-bit pointer */
399 i = va_arg(ap, u_int);
400 *(u_int *)stack = (i - arg_start) |
401 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16);
405 case 'i': /* 32-bit integer */
406 i = va_arg(ap, u_int);
411 case 'U': /* 16-bit selector */
412 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL);
416 case 'D': /* 16-bit selector */
417 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL);
421 case 'C': /* 16-bit selector */
422 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL);
426 case 's': /* 16-bit integer */
427 i = va_arg(ap, u_short);
428 *(u_short *)stack = i;
437 set_bios_selectors(&args->seg, flags);
438 bioscall_vector.vec16.offset = (u_short)args->entry;
439 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL);
441 i = bios16_call(&args->r, stack_top);
443 if (pte == (u_int *)&PTmap) {
444 *pte = 0; /* remove entry */
446 *ptd = 0; /* remove page table */
447 free(pte, M_TEMP); /* ... and free it */
451 * XXX only needs to be invlpg(0) but that doesn't work on the 386
458 #ifdef PNPBIOS /* remove conditional later */
461 * PnP BIOS interface; enumerate devices only known to the system
462 * BIOS and save information about them for later use.
472 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */
473 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */
474 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */
475 #define PNPATTR_INPUT (1<<3) /* can be primary input */
476 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */
477 #define PNPATTR_DOCK (1<<5) /* is a docking station */
478 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */
479 #define PNPATTR_CONFIG_STATIC 0x00
480 #define PNPATTR_CONFIG_DYNAMIC 0x07
481 #define PNPATTR_CONFIG_DYNONLY 0x17
482 /* device-specific data comes here */
484 } __attribute__ ((packed));
486 /* We have to cluster arguments within a 64k range for the bios16 call */
487 struct pnp_sysdevargs
490 struct pnp_sysdev node;
494 * This function is called after the bus has assigned resource
495 * locations for a logical device.
498 pnpbios_set_config(void *arg, struct isa_config *config, int enable)
503 * Quiz the PnP BIOS, build a list of PNP IDs and resource data.
506 pnpbios_identify(driver_t *driver, device_t parent)
508 struct PnPBIOS_table *pt = PnPBIOStable;
509 struct bios_args args;
510 struct pnp_sysdev *pd;
511 struct pnp_sysdevargs *pda;
512 u_int16_t ndevs, bigdev;
514 u_int8_t *devnodebuf, tag;
515 u_int32_t *devid, *compid;
519 /* no PnP BIOS information */
523 bzero(&args, sizeof(args));
524 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase);
525 args.seg.code16.limit = 0xffff; /* XXX ? */
526 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg);
527 args.seg.data.limit = 0xffff;
528 args.entry = pt->pmentryoffset;
530 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff))
531 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
532 ndevs &= 0xff; /* clear high byte garbage */
534 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
536 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
538 pda = (struct pnp_sysdevargs *)devnodebuf;
541 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) {
545 /* get current configuration */
546 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) {
547 printf("pnpbios: error %d making BIOS16 call\n", error);
550 if ((error = (args.r.eax & 0xff))) {
552 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev);
557 if (pd->size < sizeof(struct pnp_sysdev)) {
558 printf("pnpbios: bogus system node data, aborting scan\n");
563 * If we are in APIC_IO mode, we should ignore the ISA PIC if it
564 * shows up. Likewise, in !APIC_IO mode, we should ignore the
565 * APIC (less important).
566 * This is significant because the ISA PIC will claim IRQ 2 (which
567 * it uses for chaining), while in APIC mode this is a valid IRQ
568 * available for general use.
571 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */
574 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */
578 /* Add the device and parse its resources */
579 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
580 isa_set_vendorid(dev, pd->devid);
581 isa_set_logicalid(dev, pd->devid);
582 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0);
583 pnp_parse_resources(dev, &pd->devdata[0],
584 pd->size - sizeof(struct pnp_sysdev));
585 if (!device_get_desc(dev))
586 device_set_desc_copy(dev, pnp_eisaformat(pd->devid));
588 /* Find device IDs */
592 /* look for a compatible device ID too */
593 left = pd->size - sizeof(struct pnp_sysdev);
596 tag = pd->devdata[idx++];
597 if (PNP_RES_TYPE(tag) == 0) {
599 switch (PNP_SRES_NUM(tag)) {
600 case PNP_TAG_COMPAT_DEVICE:
601 compid = (u_int32_t *)(pd->devdata + idx);
603 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid);
609 idx += PNP_SRES_LEN(tag);
613 /* Large resource, skip it */
614 idx += *(u_int16_t *)(pd->devdata + idx) + 2;
617 printf("pnpbios: handle %d device ID %s (%08x)",
618 pd->handle, pnp_eisaformat(*devid), *devid);
620 printf(" compat ID %s (%08x)",
621 pnp_eisaformat(*compid), *compid);
627 static device_method_t pnpbios_methods[] = {
628 /* Device interface */
629 DEVMETHOD(device_identify, pnpbios_identify),
634 static driver_t pnpbios_driver = {
640 static devclass_t pnpbios_devclass;
642 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0);