1.\" $Id: bios.9,v 1.1 1997/08/01 06:04:08 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 <machine/pc/bios.h> 37.Ft u_int32_t 38.Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs" 39.Ft int 40.Fn bios32_SDlookup "struct bios32_SDentry *ent" 41.Ft void 42.Fn bios32 "caddr_t entry" "struct bios32_args *args" 43.Fn BIOS_PADDRTOVADDR "addr" 44.Fn BIOS_VADDRTOPADDR "addr" 45.Ft extern struct bios32_SDentry PCIbios; 46.Ft extern struct SMBIOS_table SMBIOStable; 47.Ft extern struct DMI_table DMItable; 48.Sh DESCRIPTION 49These functions provide a general-purpose interface for dealing with 50the BIOS functions and data encountered on x86 PC-architecture systems. 51.Bl -tag -width 20n 52.It Fn bios_sigsearch 53Searches the BIOS address space for a service signature, usually an 54uppercase ASCII sequence surrounded by underscores. The search begins 55at 56.Fa start , 57or at the beginning of the BIOS if 58.Fa start 59is zero. 60.Fa siglen 61bytes of the BIOS image and 62.Fa sig 63are compared at 64.Fa sigofs 65bytes offset from the current location. If no match is found, the 66current location is incremented by 67.Fa paralen 68bytes and the search repeated. If the signature is found, its effective 69physical address is returned. If no signature is found, zero is returned. 70.It Fn BIOS_VADDRTOPADDR 71Returns the effective physical address which corresponds to the kernel 72virtual address 73.Fa addr . 74.It Fn BIOS_VADDRTOPADDR 75Returns the kernel virtual address which corresponds to the effective 76physical address 77.Fa addr . 78.It SMBIOStable 79If not NULL, points to a 80.Ft struct SMBIOS_table 81structure containing information read from the System Management BIOS table 82during system startup. 83.It DMItable 84If not NULL, points to a 85.Ft struct DMI_table 86structure containing information read from the Desktop Management Interface 87parameter table during system startup. 88.El 89.Sh BIOS32 90At system startup, the BIOS is scanned for the BIOS32 Service Directory 91(part of the PCI specification), and the existence of the directory is 92recorded. This can then be used to locate other services. 93.Bl -tag -width 20n 94.It Fn bios32_SDlookup 95Attempts to locate the BIOS32 service matching the 4-byte identifier 96passed in the 97.Fa ident 98field of the 99.Fa ent 100argument. 101.It Fn bios32 102Calls a bios32 function. This presumes that the function is capable of 103working within the kernel segment (normally the case). The virtual address 104of the entrypoint is supplied in 105.Fa entry 106and the register arguments to the function are supplied in 107.Fa args . 108.It PCIbios 109If not NULL, points to a 110.Ft struct bios32_SDentry 111structure describing the PCI BIOS entrypoint which was found during system 112startup. 113.El 114 115