NAME

       struct nbft_header - NBFT Table - Header (Figure 8)

SYNOPSIS

       struct nbft_header {
           char signature[4];
           __le32 length;
           __u8 major_revision;
           __u8 checksum;
           char oem_id[6];
           char oem_table_id[8];
           __le32 oem_revision;
           __le32 creator_id;
           __le32 creator_revision;
           __le32 heap_offset;
           __le32 heap_length;
           struct nbft_heap_obj driver_dev_path_sig;
           __u8 minor_revision;
           __u8 reserved[13];
        };

Members

       signature   Signature:  An ASCII string representation of the table identifier. This field
                   shall be set to the value 4E424654h (i.e. "NBFT", see #NBFT_HEADER_SIG).

       length      Length: The length of the table, in bytes, including the header, starting from
                   offset 0h. This field is used to record the size of the entire table.

       major_revision
                   Major  Revision:  The  major  revision  of  the structure corresponding to the
                   Signature field. Larger major revision numbers should not be assumed  backward
                   compatible to lower major revision numbers with the same signature.

       checksum    Checksum:  The  entire table, including the Checksum field, shall sum to 0h to
                   be considered valid.

       oem_id      OEMID shall be populated by the NBFT driver writer by an  OEM-supplied  string
                   that identifies the OEM. All trailing bytes shall be NULL.

       oem_table_id
                   OEM  Table ID: This field shall be populated by the NBFT driver writer with an
                   OEM-supplied string that the OEM uses to identify the particular  data  table.
                   This  field  is  particularly  useful  when  defining  a  definition  block to
                   distinguish definition block functions. The OEM assigns each dissimilar  table
                   a new OEM Table ID.

       oem_revision
                   OEM  Revision:  An OEM-supplied revision number. Larger numbers are assumed to
                   be newer revisions.

       creator_id  Creator ID: Vendor ID of utility that created the table.  For  instance,  this
                   may be the ID for the ASL Compiler.

       creator_revision
                   Creator  Revision:  Revision  of utility that created the table. For instance,
                   this may be the ID for the ASL Compiler.

       heap_offset Heap Offset (HO): This field indicates the offset in bytes  of  the  heap,  if
                   any, from byte offset 0h of the NBFT Table Header.

       heap_length Heap Length (HL): The length of the heap, if any.

       driver_dev_path_sig
                   Driver  Signature  Heap  Object  Reference: This field indicates the offset in
                   bytes of a heap object containing the Driver  Signature,  if  any,  from  byte
                   offset 0h of the NBFT Table Header.

       minor_revision
                   Minor  Revision:  The  minor  revision  of  the structure corresponding to the
                   Signature field. If the  major  revision  numbers  are  the  same,  any  minor
                   revision  number  differences  shall  be  backwards  compatible  with the same
                   signature.

       reserved    Reserved.