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NAME

     bios_sigsearch, bios32_SDlookup, bios32 - interact with PC BIOS

SYNOPSIS

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/pmap.h>
     #include <machine/param.h>
     #include <machine/pmap.h>
     #include <machine/pc/bios.h>

     u_int32_t
     bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen,
             int sigofs);

     int
     bios32_SDlookup(struct bios32_SDentry *ent);

     int
     bios32(struct bios_regs *br, u_int offset, u_short segment);

     BIOS_PADDRTOVADDR(addr);

     BIOS_VADDRTOPADDR(addr);

     extern struct bios32_SDentry PCIbios;
     extern struct SMBIOS_table SMBIOStable;
     extern struct DMI_table DMItable;

DESCRIPTION

     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
                           startup.

BIOS32

     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
                           ent argument.

     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
                           args.

     PCIbios               If not NULL, points to a struct bios32_SDentry
                           structure describing the PCI BIOS entrypoint which
                           was found during system startup.