3 .\" Copyright (c) 1997 Michael Smith
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34 .Nd interact with PC BIOS
43 .Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs"
45 .Fn bios32_SDlookup "struct bios32_SDentry *ent"
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 ;
54 These functions provide a general-purpose interface for dealing with
55 the BIOS functions and data encountered on x86 PC-architecture systems.
58 Searches the BIOS address space for a service signature, usually an
59 uppercase ASCII sequence surrounded by underscores.
62 or at the beginning of the BIOS if
66 bytes of the BIOS image and
70 bytes offset from the current location.
71 If no match is found, the
72 current location is incremented by
74 bytes and the search repeated.
75 If the signature is found, its effective
76 physical address is returned.
77 If no signature is found, zero is returned.
78 .It Fn BIOS_VADDRTOPADDR
79 Returns the effective physical address which corresponds to the kernel
82 .It Fn BIOS_VADDRTOPADDR
83 Returns the kernel virtual address which corresponds to the effective
87 If not NULL, points to a
88 .Ft struct SMBIOS_table
89 structure containing information read from the System Management BIOS table
90 during system startup.
92 If not NULL, points to a
94 structure containing information read from the Desktop Management Interface
95 parameter table during system startup.
98 At system startup, the BIOS is scanned for the BIOS32 Service Directory
99 (part of the PCI specification), and the existence of the directory is
101 This can then be used to locate other services.
103 .It Fn bios32_SDlookup
104 Attempts to locate the BIOS32 service matching the 4-byte identifier
111 Calls a bios32 function.
112 This presumes that the function is capable of
113 working within the kernel segment (normally the case).
115 of the entrypoint is supplied in
117 and the register arguments to the function are supplied in
120 If not NULL, points to a
121 .Ft struct bios32_SDentry
122 structure describing the PCI BIOS entrypoint which was found during system