1.\" $FreeBSD: src/share/man/man9/bios.9,v 1.4.2.6 2001/12/17 11:30:18 ru Exp $ 2.\" $DragonFly: src/share/man/man9/bios.9,v 1.2 2003/06/17 04:37:01 dillon Exp $ 3.\" 4.\" Copyright (c) 1997 Michael Smith 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd August 1, 1997 29.Dt BIOS 9 30.Os 31.Sh NAME 32.Nm bios_sigsearch , 33.Nm bios32_SDlookup , 34.Nm bios32 35.Nd interact with PC BIOS 36.Sh SYNOPSIS 37.In sys/types.h 38.In machine/pc/bios.h 39.Ft u_int32_t 40.Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs" 41.Ft int 42.Fn bios32_SDlookup "struct bios32_SDentry *ent" 43.Ft void 44.Fn bios32 "caddr_t entry" "struct bios32_args *args" 45.Fn BIOS_PADDRTOVADDR "addr" 46.Fn BIOS_VADDRTOPADDR "addr" 47.Vt extern struct bios32_SDentry PCIbios ; 48.Vt extern struct SMBIOS_table SMBIOStable ; 49.Vt extern struct DMI_table DMItable ; 50.Sh DESCRIPTION 51These functions provide a general-purpose interface for dealing with 52the BIOS functions and data encountered on x86 PC-architecture systems. 53.Bl -tag -width 20n 54.It Fn bios_sigsearch 55Searches the BIOS address space for a service signature, usually an 56uppercase ASCII sequence surrounded by underscores. The search begins 57at 58.Fa start , 59or at the beginning of the BIOS if 60.Fa start 61is zero. 62.Fa siglen 63bytes of the BIOS image and 64.Fa sig 65are compared at 66.Fa sigofs 67bytes offset from the current location. If no match is found, the 68current location is incremented by 69.Fa paralen 70bytes and the search repeated. If the signature is found, its effective 71physical address is returned. If no signature is found, zero is returned. 72.It Fn BIOS_VADDRTOPADDR 73Returns the effective physical address which corresponds to the kernel 74virtual address 75.Fa addr . 76.It Fn BIOS_VADDRTOPADDR 77Returns the kernel virtual address which corresponds to the effective 78physical address 79.Fa addr . 80.It SMBIOStable 81If not NULL, points to a 82.Ft struct SMBIOS_table 83structure containing information read from the System Management BIOS table 84during system startup. 85.It DMItable 86If not NULL, points to a 87.Ft struct DMI_table 88structure containing information read from the Desktop Management Interface 89parameter table during system startup. 90.El 91.Sh BIOS32 92At system startup, the BIOS is scanned for the BIOS32 Service Directory 93(part of the PCI specification), and the existence of the directory is 94recorded. This can then be used to locate other services. 95.Bl -tag -width 20n 96.It Fn bios32_SDlookup 97Attempts to locate the BIOS32 service matching the 4-byte identifier 98passed in the 99.Fa ident 100field of the 101.Fa ent 102argument. 103.It Fn bios32 104Calls a bios32 function. This presumes that the function is capable of 105working within the kernel segment (normally the case). The virtual address 106of the entrypoint is supplied in 107.Fa entry 108and the register arguments to the function are supplied in 109.Fa args . 110.It PCIbios 111If not NULL, points to a 112.Ft struct bios32_SDentry 113structure describing the PCI BIOS entrypoint which was found during system 114startup. 115.El 116