1.\" $FreeBSD$ 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 August 1, 1997 28.Dt BIOS 9 29.Os 30.Sh NAME 31.Nm bios_sigsearch , 32.Nm bios32_SDlookup , 33.Nm bios32 34.Nd interact with PC BIOS 35.Sh SYNOPSIS 36.In sys/param.h 37.In vm/vm.h 38.In vm/pmap.h 39.In machine/param.h 40.In machine/pmap.h 41.In machine/pc/bios.h 42.Ft u_int32_t 43.Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs" 44.Ft int 45.Fn bios32_SDlookup "struct bios32_SDentry *ent" 46.Ft int 47.Fn bios32 "struct bios_regs *br" "u_int offset" "u_short segment" 48.Fn BIOS_PADDRTOVADDR "addr" 49.Fn BIOS_VADDRTOPADDR "addr" 50.Vt extern struct bios32_SDentry PCIbios ; 51.Vt extern struct SMBIOS_table SMBIOStable ; 52.Vt extern struct DMI_table DMItable ; 53.Sh DESCRIPTION 54These functions provide a general-purpose interface for dealing with 55the BIOS functions and data encountered on x86 PC-architecture systems. 56.Bl -tag -width 20n 57.It Fn bios_sigsearch 58Searches the BIOS address space for a service signature, usually an 59uppercase ASCII sequence surrounded by underscores. The search begins 60at 61.Fa start , 62or at the beginning of the BIOS if 63.Fa start 64is zero. 65.Fa siglen 66bytes of the BIOS image and 67.Fa sig 68are compared at 69.Fa sigofs 70bytes offset from the current location. If no match is found, the 71current location is incremented by 72.Fa paralen 73bytes and the search repeated. If the signature is found, its effective 74physical address is returned. If no signature is found, zero is returned. 75.It Fn BIOS_VADDRTOPADDR 76Returns the effective physical address which corresponds to the kernel 77virtual address 78.Fa addr . 79.It Fn BIOS_VADDRTOPADDR 80Returns the kernel virtual address which corresponds to the effective 81physical address 82.Fa addr . 83.It SMBIOStable 84If not NULL, points to a 85.Ft struct SMBIOS_table 86structure containing information read from the System Management BIOS table 87during system startup. 88.It DMItable 89If not NULL, points to a 90.Ft struct DMI_table 91structure containing information read from the Desktop Management Interface 92parameter table during system startup. 93.El 94.Sh BIOS32 95At system startup, the BIOS is scanned for the BIOS32 Service Directory 96(part of the PCI specification), and the existence of the directory is 97recorded. This can then be used to locate other services. 98.Bl -tag -width 20n 99.It Fn bios32_SDlookup 100Attempts to locate the BIOS32 service matching the 4-byte identifier 101passed in the 102.Fa ident 103field of the 104.Fa ent 105argument. 106.It Fn bios32 107Calls a bios32 function. This presumes that the function is capable of 108working within the kernel segment (normally the case). The virtual address 109of the entrypoint is supplied in 110.Fa entry 111and the register arguments to the function are supplied in 112.Fa args . 113.It PCIbios 114If not NULL, points to a 115.Ft struct bios32_SDentry 116structure describing the PCI BIOS entrypoint which was found during system 117startup. 118.El 119