NAME    [Toc]    [Back]

     bios_sigsearch, bios32_SDlookup, bios32 -- interact with PC BIOS

SYNOPSIS    [Toc]    [Back]

     #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    [Toc]    [Back]

     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_VADDRTOPADDR()   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    [Toc]    [Back]

     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.


FreeBSD 5.2.1			August 1, 1997			 FreeBSD 5.2.1