3 .\" Copyright (c) 1997 Michael Smith
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35 .Nd interact with PC BIOS
42 .Fn bios_sigsearch "uint32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs"
44 .Fn bios32_SDlookup "struct bios32_SDentry *ent"
46 .Fn bios32 "struct bios_regs *br" "u_int offset" "u_short segment"
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 .Fn bios_oem_strings "struct bios_oem *oem" "u_char *buffer" "size_t maxlen"
55 struct bios_oem_signature {
56 char * anchor; /* search anchor string in BIOS memory */
57 size_t offset; /* offset from anchor (may be negative) */
58 size_t totlen; /* total length of BIOS string to copy */
60 struct bios_oem_range {
61 u_int from; /* shouldn't be below 0xe0000 */
62 u_int to; /* shouldn't be above 0xfffff */
65 struct bios_oem_range range;
66 struct bios_oem_signature signature[];
70 These functions provide a general-purpose interface for dealing with
71 the BIOS functions and data encountered on x86 PC-architecture systems.
74 Searches the BIOS address space for a service signature, usually an
75 uppercase ASCII sequence surrounded by underscores.
78 or at the beginning of the BIOS if
82 bytes of the BIOS image and
86 bytes offset from the current location.
87 If no match is found, the
88 current location is incremented by
90 bytes and the search repeated.
91 If the signature is found, its effective
92 physical address is returned.
93 If no signature is found, zero is returned.
94 .It Fn bios_oem_strings
95 Searches a given BIOS memory range for one or more strings,
96 and composes a printable concatenation of those found.
97 The routine expects a structure describing the BIOS address
105 } -terminated array of
106 .Vt bios_oem_signature
107 structures which define the
111 from the beginning of the match (which may be negative), and
113 number of bytes to be collected from BIOS memory starting at that offset.
114 Unmatched anchors are ignored, whereas matches are copied from BIOS memory
115 starting at their corresponding
117 with unprintable characters being replaced with space, and consecutive spaces
119 This composed string is stored in
123 bytes (including trailing
125 and any trailing space suppressed).
126 If an error is encountered, i.e.\& trying to read out of said BIOS range,
127 other invalid input, or
129 overflow, a negative integer is returned, otherwise the
130 length of the composed string is returned.
131 In particular, a return
132 value of 0 means that none of the given anchor strings were found in
133 the specified BIOS memory range.
134 .It Fn BIOS_VADDRTOPADDR
135 Returns the effective physical address which corresponds to the kernel
138 .It Fn BIOS_PADDRTOVADDR
139 Returns the kernel virtual address which corresponds to the effective
143 If not NULL, points to a
144 .Ft struct SMBIOS_table
145 structure containing information read from the System Management BIOS table
146 during system startup.
148 If not NULL, points to a
150 structure containing information read from the Desktop Management Interface
151 parameter table during system startup.
154 At system startup, the BIOS is scanned for the BIOS32 Service Directory
155 (part of the PCI specification), and the existence of the directory is
157 This can then be used to locate other services.
159 .It Fn bios32_SDlookup
160 Attempts to locate the BIOS32 service matching the 4-byte identifier
167 Calls a bios32 function.
168 This presumes that the function is capable of
169 working within the kernel segment (normally the case).
171 of the entrypoint is supplied in
173 and the register arguments to the function are supplied in
176 If not NULL, points to a
177 .Ft struct bios32_SDentry
178 structure describing the PCI BIOS entrypoint which was found during system