1997-08-01 15:17:54 +00:00
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.\" $Id: bios.9,v 1.1 1997/08/01 06:04:08 msmith Exp $
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1997-08-01 06:04:08 +00:00
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.\"
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.\" Copyright (c) 1997 Michael Smith
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd Aug 1, 1997
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1997-08-01 15:17:54 +00:00
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.Dt BIOS 9
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1997-08-01 06:04:08 +00:00
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.Os FreeBSD
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.Sh NAME
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.Nm bios_sigsearch ,
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.Nm bios32_SDlookup ,
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.Nm bios32
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.Nd Interact with PC BIOS.
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.Sh SYNOPSIS
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.Fd #include <machine/pc/bios.h>
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.Ft u_int32_t
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.Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs"
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.Ft int
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.Fn bios32_SDlookup "struct bios32_SDentry *ent"
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.Ft void
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.Fn bios32 "caddr_t entry" "struct bios32_args *args"
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.Fn BIOS_PADDRTOVADDR "addr"
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.Fn BIOS_VADDRTOPADDR "addr"
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.Ft extern struct bios32_SDentry PCIbios;
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.Ft extern struct SMBIOS_table SMBIOStable;
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.Ft extern struct DMI_table DMItable;
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.Sh DESCRIPTION
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These functions provide a general-purpose interface for dealing with
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the BIOS functions and data encountered on x86 PC-architecture systems.
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.Bl -tag -width 20n
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.It Fn bios_sigsearch
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Searches the BIOS address space for a service signature, usually an
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uppercase ASCII sequence surrounded by underscores. The search begins
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at
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.Fa start ,
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or at the beginning of the BIOS if
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.Fa start
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is zero.
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.Fa siglen
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bytes of the BIOS image and
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.Fa sig
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are compared at
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.Fa sigofs
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bytes offset from the current location. If no match is found, the
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current location is incremented by
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.Fa paralen
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bytes and the search repeated. If the signature is found, its effective
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physical address is returned. If no signature is found, zero is returned.
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.It Fn BIOS_VADDRTOPADDR
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Returns the effective physical address which corresponds to the kernel
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virtual address
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.Fa addr .
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.It Fn BIOS_VADDRTOPADDR
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Returns the kernel virtual address which corresponds to the effective
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physical address
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.Fa addr .
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.It SMBIOStable
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If not NULL, points to a
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.Ft struct SMBIOS_table
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structure containing information read from the System Management BIOS table
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during system startup.
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.It DMItable
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If not NULL, points to a
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.Ft struct DMI_table
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structure containing information read from the Desktop Management Interface
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parameter table during system startup.
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.El
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.Sh BIOS32
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At system startup, the BIOS is scanned for the BIOS32 Service Directory
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(part of the PCI specification), and the existence of the directory is
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recorded. This can then be used to locate other services.
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.Bl -tag -width 20n
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.It Fn bios32_SDlookup
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Attempts to locate the BIOS32 service matching the 4-byte identifier
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passed in the
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.Fa ident
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field of the
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.Fa ent
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argument.
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.It Fn bios32
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Calls a bios32 function. This presumes that the function is capable of
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working within the kernel segment (normally the case). The virtual address
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of the entrypoint is supplied in
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.Fa entry
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and the register arguments to the function are supplied in
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.Fa args .
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.It PCIbios
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If not NULL, points to a
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.Ft struct bios32_SDentry
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structure describing the PCI BIOS entrypoint which was found during system
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startup.
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.El
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