OSDev.org

The Place to Start for Operating System Developers
It is currently Thu Mar 28, 2024 7:55 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 12:12 pm 
Offline
Member
Member

Joined: Fri Feb 11, 2022 4:55 am
Posts: 435
Location: behind the keyboard
Faulty CPUID Bits written in osdev : https://wiki.osdev.org/SSE

Straight forward from the CPUID page in wikipedia, https://en.wikipedia.org/wiki/CPUID#EAX ... d_Features

- EDX[26] is the IBRS_IBPB / spec_ctrl features, not AVX2
- AVX2 is detected through CPUID [EAX=7, ECX=0] EBX Bit 5

- AVX512 Separated features are detected also through CPUIDEX 7, it is easier to detect AVX512 just by checking the AVX512F Bit (AVX-512 Foundation) in EBX[16] (SubFunction 0).

Devc1,


Top
 Profile  
 
 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 12:16 pm 
Offline
Member
Member
User avatar

Joined: Fri Jun 11, 2021 6:02 am
Posts: 96
Location: Belgium
Feel free to amend the page.

_________________
My OS is Norost B (website, Github, sourcehut)
My filesystem is NRFS (Github, sourcehut)


Top
 Profile  
 
 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 2:22 pm 
Offline
Member
Member

Joined: Fri Feb 11, 2022 4:55 am
Posts: 435
Location: behind the keyboard
That's the problem ! everyone tells me to create/edit pages but I have no permissions.


Top
 Profile  
 
 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 3:05 pm 
Offline
Member
Member

Joined: Mon Mar 25, 2013 7:01 pm
Posts: 5099
Have you read this yet?


Top
 Profile  
 
 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 3:15 pm 
Offline
Member
Member

Joined: Fri Feb 11, 2022 4:55 am
Posts: 435
Location: behind the keyboard
So I joined but it still gives me the message :

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in the group: Users.

You can view and copy the source of this page:


Top
 Profile  
 
 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 3:17 pm 
Offline
Member
Member

Joined: Fri Feb 11, 2022 4:55 am
Posts: 435
Location: behind the keyboard
Done, now I have editing rights ! Thanks :)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 20 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