Provided by: freebsd-manpages_6.2-1_all
bios_sigsearch, bios32_SDlookup, bios32 - interact with PC BIOS
bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen,
bios32_SDlookup(struct bios32_SDentry *ent);
bios32(struct bios_regs *br, u_int offset, u_short segment);
extern struct bios32_SDentry PCIbios;
extern struct SMBIOS_table SMBIOStable;
extern struct DMI_table DMItable;
These functions provide a general-purpose interface for dealing with the
BIOS functions and data encountered on x86 PC-architecture systems.
bios_sigsearch() Searches the BIOS address space for a service
signature, usually an uppercase ASCII sequence
surrounded by underscores. The search begins at
start, or at the beginning of the BIOS if start is
zero. siglen bytes of the BIOS image and sig are
compared at sigofs bytes offset from the current
location. If no match is found, the current
location is incremented by paralen bytes and the
search repeated. If the signature is found, its
effective physical address is returned. If no
signature is found, zero is returned.
BIOS_VADDRTOPADDR() Returns the effective physical address which
corresponds to the kernel virtual address addr.
BIOS_PADDRTOVADDR() Returns the kernel virtual address which
corresponds to the effective physical address addr.
SMBIOStable If not NULL, points to a struct SMBIOS_table
structure containing information read from the
System Management BIOS table during system startup.
DMItable If not NULL, points to a struct DMI_table structure
containing information read from the Desktop
Management Interface parameter table during system
At system startup, the BIOS is scanned for the BIOS32 Service Directory
(part of the PCI specification), and the existence of the directory is
recorded. This can then be used to locate other services.
bios32_SDlookup() Attempts to locate the BIOS32 service matching the
4-byte identifier passed in the ident field of the
bios32() Calls a bios32 function. This presumes that the
function is capable of working within the kernel
segment (normally the case). The virtual address
of the entrypoint is supplied in entry and the
register arguments to the function are supplied in
PCIbios If not NULL, points to a struct bios32_SDentry
structure describing the PCI BIOS entrypoint which
was found during system startup.