Format of Pentium Pro microcode update block |
| 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" |