OSDev.org

The Place to Start for Operating System Developers
It is currently Mon Dec 11, 2017 9:06 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: What are test registers?
PostPosted: Wed Nov 08, 2017 8:41 am 
Offline
Member
Member
User avatar

Joined: Sat May 20, 2017 1:25 am
Posts: 50
Location: On your computer!
I have read about test registers tr0-tr7 but their usage is nowhere! What they are doing?

_________________
The human mind works like a multicore cpu but because it never upgrades to a newer os than the common logic, that run right now and that does not support multicore execustion, it will never find the absolute concentration!


Top
 Profile  
 
 Post subject: Re: What are test registers?
PostPosted: Wed Nov 08, 2017 9:13 am 
Offline
Member
Member
User avatar

Joined: Sat Jan 15, 2005 12:00 am
Posts: 8168
Location: At his keyboard!
Hi,

ARISTOS wrote:
I have read about test registers tr0-tr7 but their usage is nowhere! What they are doing?


These registers existed on 80486 CPUs (and nothing else), and were used to allow CPU's cache to be tested for hardware faults.

Older CPUs (80386 and older) didn't have cache built into the CPU and didn't support the registers. For newer CPUs (Pentium and later) Intel removed these registers, and for some and not others (e.g. Pentium II but not Pentium) implemented cache testing as model specific registers instead.


Cheers,

Brendan

_________________
For all things; perfection is, and will always remain, impossible to achieve in practice. However; by striving for perfection we create things that are as perfect as practically possible. Let the pursuit of perfection be our guide.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: Google [Bot] and 10 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group