AMD-K6 Datasheet, PDF (216/346 Pages) Advanced Micro Devices – AMD-K6 Processor

AMD-K6^® Processor Data Sheet
Preliminary Information
20695H/0—March 1998
10.4
Table 34. SMM State-Save Area Map (continued)
Address Offset
Contents Saved
FF28h
ES Base
FF24h
ES Limit
FF20h
—
FF1Ch
—
FF18h
—
FF14h
CR2
FF10h
CR4
FF0Ch
I/O restart ESI*
FF08h
I/O restart ECX*
FF04h
I/O restart EDI*
FF02h
HALT Restart Slot
FF00h
I/O Trap Restart Slot
FEFCh
SMM RevID
FEF8h
SMM BASE
FEF7h–FE00h
—
Notes:
— No data dump at that address
* Only contains information if SMI# is asserted during a valid I/O bus cycle.
SMM Revision Identifier
The SMM revision identifier at offset FEFCh in the SMM
state-save area specifies the version of SMM and the extensions
that are available on the processor. The SMM revision identifier
fields are as follows:
s Bits 31–18—Reserved
s Bit 17—SMM base address relocation (1 = enabled)
s Bit 16—I/O trap restart (1 = enabled)
s Bits 15–0—SMM revision level for the AMD-K6 processor =
0002h
Table 35 on page 199 shows the format of the SMM Revision
Identifier.
198
System Management Mode (SMM)
Chapter 10