BIOS(9) BSD Kernel Developer's Manual BIOS(9)NAME
bios_sigsearch, bios32_SDlookup, bios32, BIOS_PADDRTOVADDR,
BIOS_VADDRTOPADDR — interact with PC BIOS
SYNOPSIS
#include <sys/types.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);
void
bios32(caddr_t entry, struct bios32_args *args);
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 signa‐
ture, usually an uppercase ASCII sequence 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 incre‐
mented 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 corresponds
to the effective physical address 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 Manage‐
ment Interface parameter table during system
startup.
BIOS32
At system startup, the BIOS is scanned for the BIOS32 Service 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 presumes that the
function is capable of working within the kernel
segment (normally the case). The virtual 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 entrypoint which
was found during system startup.
BSD August 1, 1997 BSD
