AMD-K6 datasheet(216/346 Pages) AMD

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System Management Mode (SMM)

Chapter 10

AMD-K6® Processor Data Sheet

20695H/0—March 1998

Preliminary Information

10.4

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:

Bits 31–18—Reserved

Bit 17—SMM base address relocation (1 = enabled)

Bit 16—I/O trap restart (1 = enabled)

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.

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

—

Table 34. SMM State-Save Area Map (continued)

Address Offset

Contents Saved

Notes:

— No data dump at that address

Only contains information if SMI# is asserted during a valid I/O bus cycle.

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