How to generate a #SMI?
- From: "Lighter" <cqulyx@xxxxxxxxx>
- Date: 18 Sep 2006 02:39:38 -0700
How to generate a #SMI?
As we know, beginning with 80386, IA-32 processors provide three modes
of operation: 1, Real-address mode; 2, Protected mode; 3, System
management mode (SMM for short). According to the manuals of Intel,
there is only one way to enter SMM, which is through #SMI. But, I
wonder how the current process generates a SMI, because #SMI is an
external interrupt, and it cannot be generated by the instruction int
n.
To my thinking, the current process can use I/O instructions to do
this. Say, the system provides a special I/O port; This port is an
interface of an actual device. Upon the device detectes signal at the
given port, it generates a #SMI.
Am I right?
Many thanks in advance to those who can explain this for me.
.
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