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BIOS(9)			 BSD Kernel Developer's Manual		       BIOS(9)

     bios_sigsearch, bios32_SDlookup, bios32, bios_oem_strings — interact with
     PC BIOS

     #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>

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

     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;

     bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen);

     struct bios_oem_signature {
	     char * anchor;	     /* search anchor string in BIOS memory */
	     size_t offset;	     /* offset from anchor (may be negative) */
	     size_t totlen;	     /* total length of BIOS string to copy */
     struct bios_oem_range {
	     u_int from;	     /* shouldn't be below 0xe0000 */
	     u_int to;		     /* shouldn't be above 0xfffff */
     struct bios_oem {
	     struct bios_oem_range range;
	     struct bios_oem_signature signature[];

     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 sig‐
			   nature, usually an uppercase ASCII sequence sur‐
			   rounded 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 loca‐
			   tion 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_oem_strings()	   Searches a given BIOS memory range for one or more
			   strings, and composes a printable concatenation of
			   those found.	 The routine expects a structure
			   describing the BIOS address range (within 0xe0000 -
			   0xfffff), and a { NULL, 0, 0 } -terminated array of
			   bios_oem_signature structures which define the
			   anchor string, an offset from the beginning of the
			   match (which may be negative), and totlen number of
			   bytes to be collected from BIOS memory starting at
			   that offset.	 Unmatched anchors are ignored,
			   whereas matches are copied from BIOS memory start‐
			   ing at their corresponding offset with unprintable
			   characters being replaced with space, and consecu‐
			   tive spaces being suppressed.  This composed string
			   is stored in buffer up to the given maxlen bytes
			   (including trailing ‘\0’, and any trailing space
			   surpressed).	 If an error is encountered, i.e. try‐
			   ing to read out of said BIOS range, other invalid
			   input, or buffer overflow, a negative integer is
			   returned, otherwise the length of the composed
			   string is returned.	In particular, a return value
			   of 0 means that none of the given anchor strings
			   were found in the specified BIOS memory range.

     BIOS_VADDRTOPADDR()   Returns the effective physical address which corre‐
			   sponds to the kernel virtual address addr.

     BIOS_PADDRTOVADDR()   Returns the kernel virtual address which corre‐
			   sponds to the effective physical address addr.

     SMBIOStable	   If not NULL, points to a struct SMBIOS_table struc‐
			   ture 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 Man‐
			   agement 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
			   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 reg‐
			   ister 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.

BSD				August 9, 2005				   BSD

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