3 .\" Copyright (c) 1997 Michael Smith
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35 .Nd interact with PC BIOS
44 .Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs"
46 .Fn bios32_SDlookup "struct bios32_SDentry *ent"
48 .Fn bios32 "struct bios_regs *br" "u_int offset" "u_short segment"
49 .Fn BIOS_PADDRTOVADDR "addr"
50 .Fn BIOS_VADDRTOPADDR "addr"
51 .Vt extern struct bios32_SDentry PCIbios ;
52 .Vt extern struct SMBIOS_table SMBIOStable ;
53 .Vt extern struct DMI_table DMItable ;
55 .Fn bios_oem_strings "struct bios_oem *oem" "u_char *buffer" "size_t maxlen"
57 struct bios_oem_signature {
58 char * anchor; /* search anchor string in BIOS memory */
59 size_t offset; /* offset from anchor (may be negative) */
60 size_t totlen; /* total length of BIOS string to copy */
62 struct bios_oem_range {
63 u_int from; /* shouldn't be below 0xe0000 */
64 u_int to; /* shouldn't be above 0xfffff */
67 struct bios_oem_range range;
68 struct bios_oem_signature signature[];
72 These functions provide a general-purpose interface for dealing with
73 the BIOS functions and data encountered on x86 PC-architecture systems.
76 Searches the BIOS address space for a service signature, usually an
77 uppercase ASCII sequence surrounded by underscores.
80 or at the beginning of the BIOS if
84 bytes of the BIOS image and
88 bytes offset from the current location.
89 If no match is found, the
90 current location is incremented by
92 bytes and the search repeated.
93 If the signature is found, its effective
94 physical address is returned.
95 If no signature is found, zero is returned.
96 .It Fn bios_oem_strings
97 Searches a given BIOS memory range for one or more strings,
98 and composes a printable concatenation of those found.
99 The routine expects a structure describing the BIOS address
107 } -terminated array of
108 .Vt bios_oem_signature
109 structures which define the
113 from the beginning of the match (which may be negative), and
115 number of bytes to be collected from BIOS memory starting at that offset.
116 Unmatched anchors are ignored, whereas matches are copied from BIOS memory
117 starting at their corresponding
119 with unprintable characters being replaced with space, and consecutive spaces
121 This composed string is stored in
125 bytes (including trailing
127 and any trailing space surpressed).
128 If an error is encountered, i.e.\& trying to read out of said BIOS range,
129 other invalid input, or
131 overflow, a negative integer is returned, otherwise the
132 length of the composed string is returned.
133 In particular, a return
134 value of 0 means that none of the given anchor strings were found in
135 the specified BIOS memory range.
136 .It Fn BIOS_VADDRTOPADDR
137 Returns the effective physical address which corresponds to the kernel
140 .It Fn BIOS_PADDRTOVADDR
141 Returns the kernel virtual address which corresponds to the effective
145 If not NULL, points to a
146 .Ft struct SMBIOS_table
147 structure containing information read from the System Management BIOS table
148 during system startup.
150 If not NULL, points to a
152 structure containing information read from the Desktop Management Interface
153 parameter table during system startup.
156 At system startup, the BIOS is scanned for the BIOS32 Service Directory
157 (part of the PCI specification), and the existence of the directory is
159 This can then be used to locate other services.
161 .It Fn bios32_SDlookup
162 Attempts to locate the BIOS32 service matching the 4-byte identifier
169 Calls a bios32 function.
170 This presumes that the function is capable of
171 working within the kernel segment (normally the case).
173 of the entrypoint is supplied in
175 and the register arguments to the function are supplied in
178 If not NULL, points to a
179 .Ft struct bios32_SDentry
180 structure describing the PCI BIOS entrypoint which was found during system