Format of Multiprocessor Specification configuration table header

Offset  Size    Description     (Table M081)
 00h  4 BYTEs  signature "PCMP"
 04h   WORD    length of base configuration table in bytes, including
         this header
 06h   BYTE    revision of MP specification supported
       01h = v1.1
       04h = v1.4
 07h   BYTE    checksum of entire base configuration table
 08h  8 BYTEs  OEM identifier
 10h 12 BYTEs  product ID
 1Ch   DWORD   physical address to OEM-defined configuration table
       00000000h if not present
 20h   WORD    size of base OEM table in bytes (0000h if not present)
 22h   WORD    number of entries in variable portion of base table
 24h   DWORD   address of local APIC (see also MEM FEE0h:0020h)
 28h   WORD    length of extended entries following end of base table
         (in bytes)
 2Ah   BYTE    checksum for extended table entries (includes only
         extended entries following base table)
 2Ch   var configuration table entries (see #M082)

See Also: #M080