FreeBSD-5.3/sys/i386/i386/bios.c
/*-
* Copyright (c) 1997 Michael Smith
* Copyright (c) 1998 Jonathan Lemon
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/i386/i386/bios.c,v 1.70 2004/06/23 17:59:01 jhb Exp $");
/*
* Code for dealing with the BIOS in x86 PC systems.
*/
#include "opt_isa.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/pcpu.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <machine/segments.h>
#include <machine/stdarg.h>
#include <machine/vmparam.h>
#include <machine/pc/bios.h>
#ifdef DEV_ISA
#include <isa/isavar.h>
#include <isa/pnpreg.h>
#include <isa/pnpvar.h>
#endif
#define BIOS_START 0xe0000
#define BIOS_SIZE 0x20000
/* exported lookup results */
struct bios32_SDentry PCIbios;
static struct PnPBIOS_table *PnPBIOStable;
static u_int bios32_SDCI;
/* start fairly early */
static void bios32_init(void *junk);
SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL);
/*
* bios32_init
*
* Locate various bios32 entities.
*/
static void
bios32_init(void *junk)
{
u_long sigaddr;
struct bios32_SDheader *sdh;
struct PnPBIOS_table *pt;
u_int8_t ck, *cv;
int i;
char *p;
/*
* BIOS32 Service Directory, PCI BIOS
*/
/* look for the signature */
if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) {
/* get a virtual pointer to the structure */
sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) {
ck += cv[i];
}
/* If checksum is OK, enable use of the entrypoint */
if ((ck == 0) && (BIOS_START <= sdh->entry ) &&
(sdh->entry < (BIOS_START + BIOS_SIZE))) {
bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry);
if (bootverbose) {
printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh);
printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n",
sdh->entry, bios32_SDCI, sdh->revision, sdh->len);
}
/* Allow user override of PCI BIOS search */
if (((p = getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) {
/* See if there's a PCI BIOS entrypoint here */
PCIbios.ident.id = 0x49435024; /* PCI systems should have this */
if (!bios32_SDlookup(&PCIbios) && bootverbose)
printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry);
}
if (p != NULL)
freeenv(p);
} else {
printf("bios32: Bad BIOS32 Service Directory\n");
}
}
/*
* PnP BIOS
*
* Allow user override of PnP BIOS search
*/
if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) &&
((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) {
/* get a virtual pointer to the structure */
pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) {
ck += cv[i];
}
/* If checksum is OK, enable use of the entrypoint */
if (ck == 0) {
PnPBIOStable = pt;
if (bootverbose) {
printf("pnpbios: Found PnP BIOS data at %p\n", pt);
printf("pnpbios: Entry = %x:%x Rev = %d.%d\n",
pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf);
if ((pt->control & 0x3) == 0x01)
printf("pnpbios: Event flag at %x\n", pt->evflagaddr);
if (pt->oemdevid != 0)
printf("pnpbios: OEM ID %x\n", pt->oemdevid);
}
} else {
printf("pnpbios: Bad PnP BIOS data checksum\n");
}
}
if (p != NULL)
freeenv(p);
if (bootverbose) {
/* look for other know signatures */
printf("Other BIOS signatures found:\n");
}
}
/*
* bios32_SDlookup
*
* Query the BIOS32 Service Directory for the service named in (ent),
* returns nonzero if the lookup fails. The caller must fill in
* (ent->ident), the remainder are populated on a successful lookup.
*/
int
bios32_SDlookup(struct bios32_SDentry *ent)
{
struct bios_regs args;
if (bios32_SDCI == 0)
return (1);
args.eax = ent->ident.id; /* set up arguments */
args.ebx = args.ecx = args.edx = 0;
bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL));
if ((args.eax & 0xff) == 0) { /* success? */
ent->base = args.ebx;
ent->len = args.ecx;
ent->entry = args.edx;
ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry);
return (0); /* all OK */
}
return (1); /* failed */
}
/*
* bios_sigsearch
*
* Search some or all of the BIOS region for a signature string.
*
* (start) Optional offset returned from this function
* (for searching for multiple matches), or NULL
* to start the search from the base of the BIOS.
* Note that this will be a _physical_ address in
* the range 0xe0000 - 0xfffff.
* (sig) is a pointer to the byte(s) of the signature.
* (siglen) number of bytes in the signature.
* (paralen) signature paragraph (alignment) size.
* (sigofs) offset of the signature within the paragraph.
*
* Returns the _physical_ address of the found signature, 0 if the
* signature was not found.
*/
u_int32_t
bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
{
u_char *sp, *end;
/* compute the starting address */
if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
sp = (char *)BIOS_PADDRTOVADDR(start);
} else if (start == 0) {
sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
} else {
return 0; /* bogus start address */
}
/* compute the end address */
end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
/* loop searching */
while ((sp + sigofs + siglen) < end) {
/* compare here */
if (!bcmp(sp + sigofs, sig, siglen)) {
/* convert back to physical address */
return((u_int32_t)BIOS_VADDRTOPADDR(sp));
}
sp += paralen;
}
return(0);
}
/*
* do not staticize, used by bioscall.s
*/
union {
struct {
u_short offset;
u_short segment;
} vec16;
struct {
u_int offset;
u_short segment;
} vec32;
} bioscall_vector; /* bios jump vector */
void
set_bios_selectors(struct bios_segments *seg, int flags)
{
struct soft_segment_descriptor ssd = {
0, /* segment base address (overwritten) */
0, /* length (overwritten) */
SDT_MEMERA, /* segment type (overwritten) */
0, /* priority level */
1, /* descriptor present */
0, 0,
1, /* descriptor size (overwritten) */
0 /* granularity == byte units */
};
union descriptor *p_gdt;
#ifdef SMP
p_gdt = &gdt[PCPU_GET(cpuid) * NGDT];
#else
p_gdt = gdt;
#endif
ssd.ssd_base = seg->code32.base;
ssd.ssd_limit = seg->code32.limit;
ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd);
ssd.ssd_def32 = 0;
if (flags & BIOSCODE_FLAG) {
ssd.ssd_base = seg->code16.base;
ssd.ssd_limit = seg->code16.limit;
ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd);
}
ssd.ssd_type = SDT_MEMRWA;
if (flags & BIOSDATA_FLAG) {
ssd.ssd_base = seg->data.base;
ssd.ssd_limit = seg->data.limit;
ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd);
}
if (flags & BIOSUTIL_FLAG) {
ssd.ssd_base = seg->util.base;
ssd.ssd_limit = seg->util.limit;
ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd);
}
if (flags & BIOSARGS_FLAG) {
ssd.ssd_base = seg->args.base;
ssd.ssd_limit = seg->args.limit;
ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd);
}
}
extern int vm86pa;
extern void bios16_jmp(void);
/*
* this routine is really greedy with selectors, and uses 5:
*
* 32-bit code selector: to return to kernel
* 16-bit code selector: for running code
* data selector: for 16-bit data
* util selector: extra utility selector
* args selector: to handle pointers
*
* the util selector is set from the util16 entry in bios16_args, if a
* "U" specifier is seen.
*
* See <machine/pc/bios.h> for description of format specifiers
*/
int
bios16(struct bios_args *args, char *fmt, ...)
{
char *p, *stack, *stack_top;
va_list ap;
int flags = BIOSCODE_FLAG | BIOSDATA_FLAG;
u_int i, arg_start, arg_end;
pt_entry_t *pte;
pd_entry_t *ptd;
arg_start = 0xffffffff;
arg_end = 0;
/*
* Some BIOS entrypoints attempt to copy the largest-case
* argument frame (in order to generalise handling for
* different entry types). If our argument frame is
* smaller than this, the BIOS will reach off the top of
* our constructed stack segment. Pad the top of the stack
* with some garbage to avoid this.
*/
stack = (caddr_t)PAGE_SIZE - 32;
va_start(ap, fmt);
for (p = fmt; p && *p; p++) {
switch (*p) {
case 'p': /* 32-bit pointer */
i = va_arg(ap, u_int);
arg_start = min(arg_start, i);
arg_end = max(arg_end, i);
flags |= BIOSARGS_FLAG;
stack -= 4;
break;
case 'i': /* 32-bit integer */
i = va_arg(ap, u_int);
stack -= 4;
break;
case 'U': /* 16-bit selector */
flags |= BIOSUTIL_FLAG;
/* FALLTHROUGH */
case 'D': /* 16-bit selector */
case 'C': /* 16-bit selector */
stack -= 2;
break;
case 's': /* 16-bit integer passed as an int */
i = va_arg(ap, int);
stack -= 2;
break;
default:
return (EINVAL);
}
}
if (flags & BIOSARGS_FLAG) {
if (arg_end - arg_start > ctob(16))
return (EACCES);
args->seg.args.base = arg_start;
args->seg.args.limit = 0xffff;
}
args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME;
args->seg.code32.limit = 0xffff;
ptd = (pd_entry_t *)rcr3();
#ifdef PAE
if (ptd == IdlePDPT)
#else
if (ptd == IdlePTD)
#endif
{
/*
* no page table, so create one and install it.
*/
pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
ptd = (pd_entry_t *)((u_int)IdlePTD + KERNBASE);
*pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
*ptd = vtophys(pte) | PG_RW | PG_V;
} else {
/*
* this is a user-level page table
*/
pte = PTmap;
*pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V;
}
pmap_invalidate_all(kernel_pmap); /* XXX insurance for now */
stack_top = stack;
va_start(ap, fmt);
for (p = fmt; p && *p; p++) {
switch (*p) {
case 'p': /* 32-bit pointer */
i = va_arg(ap, u_int);
*(u_int *)stack = (i - arg_start) |
(GSEL(GBIOSARGS_SEL, SEL_KPL) << 16);
stack += 4;
break;
case 'i': /* 32-bit integer */
i = va_arg(ap, u_int);
*(u_int *)stack = i;
stack += 4;
break;
case 'U': /* 16-bit selector */
*(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL);
stack += 2;
break;
case 'D': /* 16-bit selector */
*(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL);
stack += 2;
break;
case 'C': /* 16-bit selector */
*(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL);
stack += 2;
break;
case 's': /* 16-bit integer passed as an int */
i = va_arg(ap, int);
*(u_short *)stack = i;
stack += 2;
break;
default:
return (EINVAL);
}
}
set_bios_selectors(&args->seg, flags);
bioscall_vector.vec16.offset = (u_short)args->entry;
bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL);
i = bios16_call(&args->r, stack_top);
if (pte == PTmap) {
*pte = 0; /* remove entry */
/*
* XXX only needs to be invlpg(0) but that doesn't work on the 386
*/
pmap_invalidate_all(kernel_pmap);
} else {
*ptd = 0; /* remove page table */
/*
* XXX only needs to be invlpg(0) but that doesn't work on the 386
*/
pmap_invalidate_all(kernel_pmap);
free(pte, M_TEMP); /* ... and free it */
}
return (i);
}
const u_char *
bios_string(u_int from, u_int to, const u_char *string, int len)
{
const char *t, *te;
if (len == 0)
len = strlen(string);
t = (const char *)(KERNBASE + from);
te = (const char *)(KERNBASE + to);
for (; t <= te; t++)
if (!memcmp(string, t, len))
return (t);
return (NULL);
}
#ifdef DEV_ISA
/*
* PnP BIOS interface; enumerate devices only known to the system
* BIOS and save information about them for later use.
*/
struct pnp_sysdev
{
u_int16_t size;
u_int8_t handle;
u_int32_t devid;
u_int8_t type[3];
u_int16_t attrib;
#define PNPATTR_NODISABLE (1<<0) /* can't be disabled */
#define PNPATTR_NOCONFIG (1<<1) /* can't be configured */
#define PNPATTR_OUTPUT (1<<2) /* can be primary output */
#define PNPATTR_INPUT (1<<3) /* can be primary input */
#define PNPATTR_BOOTABLE (1<<4) /* can be booted from */
#define PNPATTR_DOCK (1<<5) /* is a docking station */
#define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */
#define PNPATTR_CONFIG_STATIC (0)
#define PNPATTR_CONFIG_DYNAMIC (1)
#define PNPATTR_CONFIG_DYNONLY (3)
#define PNPATTR_CONFIG(a) (((a) >> 7) & 0x3)
/* device-specific data comes here */
u_int8_t devdata[0];
} __packed;
/* We have to cluster arguments within a 64k range for the bios16 call */
struct pnp_sysdevargs
{
u_int16_t next;
struct pnp_sysdev node;
};
/*
* This function is called after the bus has assigned resource
* locations for a logical device.
*/
static void
pnpbios_set_config(void *arg, struct isa_config *config, int enable)
{
}
/*
* Quiz the PnP BIOS, build a list of PNP IDs and resource data.
*/
static void
pnpbios_identify(driver_t *driver, device_t parent)
{
struct PnPBIOS_table *pt = PnPBIOStable;
struct bios_args args;
struct pnp_sysdev *pd;
struct pnp_sysdevargs *pda;
u_int16_t ndevs, bigdev;
int error, currdev;
u_int8_t *devnodebuf, tag;
u_int32_t *devid, *compid;
int idx, left;
device_t dev;
/* no PnP BIOS information */
if (pt == NULL)
return;
/* Check to see if ACPI is already active. */
dev = devclass_get_device(devclass_find("acpi"), 0);
if (dev != NULL && device_is_attached(dev))
return;
/* get count of PnP devices */
bzero(&args, sizeof(args));
args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase);
args.seg.code16.limit = 0xffff; /* XXX ? */
args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg);
args.seg.data.limit = 0xffff;
args.entry = pt->pmentryoffset;
if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff))
printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
ndevs &= 0xff; /* clear high byte garbage */
if (bootverbose)
printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
M_DEVBUF, M_NOWAIT);
pda = (struct pnp_sysdevargs *)devnodebuf;
pd = &pda->node;
for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) {
bzero(pd, bigdev);
pda->next = currdev;
/* get current configuration */
if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) {
printf("pnpbios: error %d making BIOS16 call\n", error);
break;
}
if ((error = (args.r.eax & 0xff))) {
if (bootverbose)
printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev);
if (error & 0x80)
break;
}
currdev = pda->next;
if (pd->size < sizeof(struct pnp_sysdev)) {
printf("pnpbios: bogus system node data, aborting scan\n");
break;
}
/*
* Ignore PICs so that we don't have to worry about the PICs
* claiming IRQs to prevent their use. The PIC drivers
* already ensure that invalid IRQs are not used.
*/
if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */
continue;
if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */
continue;
/* Add the device and parse its resources */
dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
isa_set_vendorid(dev, pd->devid);
isa_set_logicalid(dev, pd->devid);
/*
* It appears that some PnP BIOS doesn't allow us to re-enable
* the embedded system device once it is disabled. We shall
* mark all system device nodes as "cannot be disabled", regardless
* of actual settings in the device attribute byte.
* XXX
isa_set_configattr(dev,
((pd->attrib & PNPATTR_NODISABLE) ? 0 : ISACFGATTR_CANDISABLE) |
((!(pd->attrib & PNPATTR_NOCONFIG) &&
PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
? ISACFGATTR_DYNAMIC : 0));
*/
isa_set_configattr(dev,
(!(pd->attrib & PNPATTR_NOCONFIG) &&
PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC)
? ISACFGATTR_DYNAMIC : 0);
ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0);
pnp_parse_resources(dev, &pd->devdata[0],
pd->size - sizeof(struct pnp_sysdev), 0);
if (!device_get_desc(dev))
device_set_desc_copy(dev, pnp_eisaformat(pd->devid));
/* Find device IDs */
devid = &pd->devid;
compid = NULL;
/* look for a compatible device ID too */
left = pd->size - sizeof(struct pnp_sysdev);
idx = 0;
while (idx < left) {
tag = pd->devdata[idx++];
if (PNP_RES_TYPE(tag) == 0) {
/* Small resource */
switch (PNP_SRES_NUM(tag)) {
case PNP_TAG_COMPAT_DEVICE:
compid = (u_int32_t *)(pd->devdata + idx);
if (bootverbose)
printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid);
/* FALLTHROUGH */
case PNP_TAG_END:
idx = left;
break;
default:
idx += PNP_SRES_LEN(tag);
break;
}
} else
/* Large resource, skip it */
idx += *(u_int16_t *)(pd->devdata + idx) + 2;
}
if (bootverbose) {
printf("pnpbios: handle %d device ID %s (%08x)",
pd->handle, pnp_eisaformat(*devid), *devid);
if (compid != NULL)
printf(" compat ID %s (%08x)",
pnp_eisaformat(*compid), *compid);
printf("\n");
}
}
}
static device_method_t pnpbios_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, pnpbios_identify),
{ 0, 0 }
};
static driver_t pnpbios_driver = {
"pnpbios",
pnpbios_methods,
1, /* no softc */
};
static devclass_t pnpbios_devclass;
DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0);
#endif /* DEV_ISA */