what is the funciton of LOCKEDCODE?

NTDEV
1

I always saw the #pragma LOCKEDCODE in driver.
What is function of it? I found LOCKED CODE is defined to be code_seg(). Means that function flaged with LOCKEDCODE will be put in .text.

Can LOCKEDCODE code be paged out in driver?

thank you very much.

2

If by “LOCKED CODE is defined to be code_seg()” you mean #define LOCKEDCODE code_seg(),
then code in LOCKEDCODE section will go into the default code section, and, hence, is not going to be pageable. However, if you mean #define LOCKEDCODE code_seg(“PAGE”), then it will go to the PAGE section, and will be pageable. Therefore, this is just the question of definition…

Anton Bassov

3

From:
>I always saw the #pragma LOCKEDCODE in driver.
> What is function of it? I found LOCKED CODE is defined to be code_seg().
> Means that function flaged with LOCKEDCODE will be put in .text.

#pragma code_seg() reverts to the default section for compiled code, namely
_text. That ends up in non-paged memory. I chose LOCKEDCODE to connote
“locked pages”, which was the description we used in the old 9x days. The
converse is PAGEDCODE, which equates to code_seg(“PAGE”). Any section name
beginning with the letters P-A-G-E is placed into paged memory.

Walter Oney
Consulting and Training
www.oneysoft.com

4

Dear anton bassov and Walter Oney
thank you very much for your clear explain.
thanks again.