flat assembler
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Index > OS Construction > ureal mode

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amitkumartiwari29



Joined: 25 Sep 2005
Posts: 2
Location: India
amitkumartiwari29
Can you tell me a program in ASM to check if my system is in Unreal mode or not or a program to create an array of 3 GB.

Thanks and regards

_________________
How to test that the system is in real flat 4gb mode through a C program.

Please help!
Post 26 Sep 2005, 22:41
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
you have computer with 3gb RAM?
Post 27 Sep 2005, 07:27
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17248
Location: In your JS exploiting you and your system
revolution
Try this:
Code:
use32
smsw eax
shr eax,1 ;test for PE
jc SystemIsInPortectedMode
or eax,-1
shr eax,16
jz SystemIsInRealMode
use32
;code for unreal mode goes here
ret
SystemIsInRealMode:
use16
;code for real mode goes here
ret
SystemIsInPortectedMode:
use32
;code for protected mode goes here
ret    
If you need it in C then you can probably use inline assembly.

Assemble for 32 bit run mode (use32). If the code is running in 16 bit mode (real mode) at run time then it will still run but using AX instead of EAX.
Post 27 Sep 2005, 08:07
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