AMD-K6-2ESLASH233AMZ datasheet(236/332 Pages) AMD

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218

System Management Mode (SMM)

Chapter 11

AMD-K6™-2E Processor Data Sheet

22529B/0—January 2000

Preliminary Information

A20M# is masked

Interrupt vectors use the real-mode interrupt vector table

The IF flag in EFLAGS is cleared (INTR not recognized)

The TF flag in EFLAGS is cleared

The NMI and INIT interrupts are disabled

Debug register DR7 is cleared (debug traps disabled)

Figure 81 shows the default map of the SMM memory area. It

co ns is ts o f a 6 4 -K by te area , be twee n 0 0 0 3 _0 00 0h and

0003_FFFFh, of which the top 32 Kbytes (0003_8000h to

0003_FFFFh) must be populated with RAM. The default

code-segment (CS) base address for the area—called the SMM

base addr ess — is a t 0003_ 0000h. T h e top 512 b y te s

(0003_FE00h to 0003_FFFFh) contain a fill-down SMM

state-save area. The default entry point for the SMM service

routine is 0003_8000h.

Figure 81. SMM Memory

SMM

State-Save

Area

SMM Base Address (CS)

Service Routine Entry Point

Fill Down

SMM

Service Routine

32-Kbyte

Minimum RAM

0003_8000h

0003_FE00h

0003_FFFFh

0003_0000h

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