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


NAME

     bios_sigsearch, BIOS_PADDRTOVADDR, BIOS_VADDRTOPADDR -- interact with PC
     BIOS


SYNOPSIS

     #include <sys/types.h>
     #include <machine/pc/bios.h>

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

     BIOS_PADDRTOVADDR(addr);

     BIOS_VADDRTOPADDR(addr);


DESCRIPTION

     A number of macros and functions are available to deal with BIOS 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.

DragonFly 4.3                  September 9, 2015                 DragonFly 4.3

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