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Format of Pentium Pro microcode update block

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Offset Size Description

00h

DWORD

update header version number (currently 00000001h) FFFFFFFFh = unused block

04h

DWORD

revision number of this microcode update

08h

DWORD

update creation date, as BCD mmddyyyy (month,day,year)

0Ch

DWORD

family/model/stepping of processor to which update applied (same value as returned by CPUID instruction)

10h

DWORD

checksum (used to force sum of all 512 DWORDs of the update block to 00000000h)

14h

DWORD

revision number of loader needed to install update (currently 00000001h)

18h

24 BYTEs

reserved for future expansion

30h

2000 BYTEs

encrypted microcode data

Note:

See Also:

MSR 00000079h,OPCODE "CPUID"