AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 212

• Manufacturer Part Number: AMD-K6
• Description: AMD-K6 Processor
• Manufacturer: AMD [Advanced Micro Devices]

AMD-K6
194
®
Processor Data Sheet
Figure 72 on page 195 shows the default map of the SMM
me mo ry a rea . I t c onsis ts o f a 64 -Kbyt e area, bet wee n
0003_0000h 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 —
bytes (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.
called the SMM base address — is at 0003_0000h. The top 512
Far jumps or calls cannot transfer control to a segment with
a base address requiring more than 20 bits, as in Real mode
segment-base addressing
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)
System Management Mode (SMM)
Preliminary Information
20695H/0—March 1998
Chapter 10