1.\" $Id: bios.9,v 1.2 1997/08/01 15:17:54 msmith Exp $ 2.\" 3.\" Copyright (c) 1997 Michael Smith 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.Dd Aug 1, 1997 28.Dt BIOS 9 29.Os FreeBSD 30.Sh NAME 31.Nm bios_sigsearch , 32.Nm bios32_SDlookup , 33.Nm bios32 34.Nd Interact with PC BIOS. 35.Sh SYNOPSIS 36.Fd #include <sys/types.h> 37.Fd #include <machine/pc/bios.h> 38.Ft u_int32_t 39.Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs" 40.Ft int 41.Fn bios32_SDlookup "struct bios32_SDentry *ent" 42.Ft void 43.Fn bios32 "caddr_t entry" "struct bios32_args *args" 44.Fn BIOS_PADDRTOVADDR "addr" 45.Fn BIOS_VADDRTOPADDR "addr" 46.Ft extern struct bios32_SDentry PCIbios; 47.Ft extern struct SMBIOS_table SMBIOStable; 48.Ft extern struct DMI_table DMItable; 49.Sh DESCRIPTION 50These functions provide a general-purpose interface for dealing with 51the BIOS functions and data encountered on x86 PC-architecture systems. 52.Bl -tag -width 20n 53.It Fn bios_sigsearch 54Searches the BIOS address space for a service signature, usually an 55uppercase ASCII sequence surrounded by underscores. The search begins 56at 57.Fa start , 58or at the beginning of the BIOS if 59.Fa start 60is zero. 61.Fa siglen 62bytes of the BIOS image and 63.Fa sig 64are compared at 65.Fa sigofs 66bytes offset from the current location. If no match is found, the 67current location is incremented by 68.Fa paralen 69bytes and the search repeated. If the signature is found, its effective 70physical address is returned. If no signature is found, zero is returned. 71.It Fn BIOS_VADDRTOPADDR 72Returns the effective physical address which corresponds to the kernel 73virtual address 74.Fa addr . 75.It Fn BIOS_VADDRTOPADDR 76Returns the kernel virtual address which corresponds to the effective 77physical address 78.Fa addr . 79.It SMBIOStable 80If not NULL, points to a 81.Ft struct SMBIOS_table 82structure containing information read from the System Management BIOS table 83during system startup. 84.It DMItable 85If not NULL, points to a 86.Ft struct DMI_table 87structure containing information read from the Desktop Management Interface 88parameter table during system startup. 89.El 90.Sh BIOS32 91At system startup, the BIOS is scanned for the BIOS32 Service Directory 92(part of the PCI specification), and the existence of the directory is 93recorded. This can then be used to locate other services. 94.Bl -tag -width 20n 95.It Fn bios32_SDlookup 96Attempts to locate the BIOS32 service matching the 4-byte identifier 97passed in the 98.Fa ident 99field of the 100.Fa ent 101argument. 102.It Fn bios32 103Calls a bios32 function. This presumes that the function is capable of 104working within the kernel segment (normally the case). The virtual address 105of the entrypoint is supplied in 106.Fa entry 107and the register arguments to the function are supplied in 108.Fa args . 109.It PCIbios 110If not NULL, points to a 111.Ft struct bios32_SDentry 112structure describing the PCI BIOS entrypoint which was found during system 113startup. 114.El 115 116