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 1.4 2007/02/18 14:17:29 swildner Exp $
4 .\" Copyright (c) 1997 Michael Smith
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35 .Nm BIOS_PADDRTOVADDR ,
37 .Nd interact with PC BIOS
42 .Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs"
44 .Fn bios32_SDlookup "struct bios32_SDentry *ent"
46 .Fn bios32 "caddr_t entry" "struct bios32_args *args"
47 .Fn BIOS_PADDRTOVADDR "addr"
48 .Fn BIOS_VADDRTOPADDR "addr"
49 .Vt extern struct bios32_SDentry PCIbios ;
50 .Vt extern struct SMBIOS_table SMBIOStable ;
51 .Vt extern struct DMI_table DMItable ;
53 These functions provide a general-purpose interface for dealing with
54 the BIOS functions and data encountered on x86 PC-architecture systems.
55 .Bl -tag -width ".Fn BIOS_PADDRTOVADDR"
57 Searches the BIOS address space for a service signature, usually an
58 uppercase ASCII sequence surrounded by underscores. The search begins
61 or at the beginning of the BIOS if
65 bytes of the BIOS image and
69 bytes offset from the current location. If no match is found, the
70 current location is incremented by
72 bytes and the search repeated. If the signature is found, its effective
73 physical address is returned. If no signature is found, zero is returned.
74 .It Fn BIOS_VADDRTOPADDR
75 Returns the effective physical address which corresponds to the kernel
78 .It Fn BIOS_PADDRTOVADDR
79 Returns the kernel virtual address which corresponds to the effective
83 If not NULL, points to a
84 .Ft struct SMBIOS_table
85 structure containing information read from the System Management BIOS table
86 during system startup.
88 If not NULL, points to a
90 structure containing information read from the Desktop Management Interface
91 parameter table during system startup.
94 At system startup, the BIOS is scanned for the BIOS32 Service Directory
95 (part of the PCI specification), and the existence of the directory is
96 recorded. This can then be used to locate other services.
97 .Bl -tag -width ".Fn BIOS_PADDRTOVADDR"
98 .It Fn bios32_SDlookup
99 Attempts to locate the BIOS32 service matching the 4-byte identifier
106 Calls a bios32 function. This presumes that the function is capable of
107 working within the kernel segment (normally the case). The virtual address
108 of the entrypoint is supplied in
110 and the register arguments to the function are supplied in
113 If not NULL, points to a
114 .Ft struct bios32_SDentry
115 structure describing the PCI BIOS entrypoint which was found during system