bios(9)

NAME

bios_sigsearch, bios32_SDlookup, bios32 - interact with PC

BIOS

SYNOPSIS

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/param.h>
#include <machine/pmap.h>
#include <machine/pc/bios.h>
u_int32_t
bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int
paralen,
        int sigofs);
int
bios32_SDlookup(struct bios32_SDentry *ent);
int
bios32(struct bios_regs *br, u_int offset, u_short segment);
BIOS_PADDRTOVADDR(addr);
BIOS_VADDRTOPADDR(addr);
extern struct bios32_SDentry PCIbios;
extern struct SMBIOS_table SMBIOStable;
extern struct DMI_table DMItable;

DESCRIPTION

These functions provide a general-purpose interface for

dealing with the
BIOS functions and data encountered on x86 PC-architecture

systems.

bios_sigsearch() Searches the BIOS address space for a

service sig

nature, usually an uppercase ASCII se

quence surrounded by underscores. The search

begins at
start, or at the beginning of the BIOS

if start is
zero. siglen bytes of the BIOS image

and sig are
compared at sigofs bytes offset from

the current
location. If no match is found, the

current location is incremented by paralen bytes

and the search
repeated. If the signature is found,

its effective
physical address is returned. If no

signature is
found, zero is returned.

BIOS_VADDRTOPADDR() Returns the effective physical address

which corre

sponds to the kernel virtual address

addr.

BIOS_PADDRTOVADDR() Returns the kernel virtual address

which corre

sponds to the effective physical ad

dress addr.

SMBIOStable If not NULL, points to a struct

SMBIOS_table struc

ture containing information read from

the System
Management BIOS table during system

startup.

DMItable If not NULL, points to a struct

DMI_table structure

containing information read from the

Desktop Management Interface parameter table dur

ing system
startup.

BIOS32

At system startup, the BIOS is scanned for the BIOS32 Ser

vice Directory
(part of the PCI specification), and the existence of the

directory is
recorded. This can then be used to locate other services.

bios32_SDlookup() Attempts to locate the BIOS32 service

matching the

4-byte identifier passed in the ident

field of the
ent argument.

bios32() Calls a bios32 function. This pre

sumes that the

function is capable of working within

the kernel
segment (normally the case). The vir

tual address
of the entrypoint is supplied in entry

and the register arguments to the function are

supplied in
args.

PCIbios If not NULL, points to a struct

bios32_SDentry

structure describing the PCI BIOS en

trypoint which
was found during system startup.

BSD August 1, 1997

BSD