The Organization of SM RAM

Refer to Figure 60-1 on page 1470. As mentioned earlier, the SM handler program can access up to 4GB of SM RAM address space. After a reset or a power-up, the processor's SM Base address is preset to address 00030000h and the processor determines the address of the following locations relative to the SM Base address:

  • The entry point into the SM handler program = the SM Base address + 8000h. Since the default value of the SM Base address is 00030000h, this defines the default entry point address to be 00030000h + 8000h = 00038000h.

  • The start address of the 512-byte State Save Area wherein the processor saves its register set on entry to SMM is defined as the SM Base address (00030000h) + FE00h = 0003FE00h. This is the ...

Get The Unabridged Pentium 4 IA32 Processor Genealogy now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial