I should intercept Power-button...
It can be made only if to know handler SMM address
How to learn handler SMM address

SMM?

systems management mode?

yes, System Managment Mode...

which OS are u talking about?

Probably his own... dunno anything about these issues really Kreoton, but perhaps have a look at the linux ACPI code?

I now write OS, it is necessary to me that she was capable to intercept pressing from Power-Button...
For this purpose it is necessary to know SMBASE...

Miraculix Operation System:
snapshot: http://filesx.narod.ru/Miraculix.rar
source code (kernel): http://filesx.narod.ru/kernel.asm

Hi Comrade:
Please see the Intel development refernece volume 3. In the BIOS post time, the first smbase address is 38000h, then the BIOS will adjust it A000H. Of course, if the machine have four cpus, then all of cpus smbase must be not equal.

The SMM handler present two types: one is below 31K and CS:EIP below 1M address. Aonther is below 1M byte and CS:EIP above 1M address and below 4G byte.

The SMM only used by BIOS, so the OS can't access SMM code. It should be transant for OS and application.