Grub Memory Map - Processor

Grub Memory Map - Processor

[Juan_2007]

I need to make a Project for the University and i wanted to know if any of
you guys, knew if the Grub left any information regarding the type of
microprocessor that the computer is using.  i know the grub leaves
information about the amount of memory and i suppose it does the same with
the microprocessor, if any of you have any clues about it, or where can i
get that info, i´ll be glad to know.  The GRUB webpage has an incomplete
manual, and the part of the memory map y incomplete so i can´t read it from
there.

Thanks, Juan.
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Re: Grub Memory Map - Processor

[Andrei E. Warkentin]

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Juan,

You may use the CPUID instruction to correctly identify the processor  
your code is executing on. GRUB does not provide such information as  
part of the Multiboot info.

Andrei Evgenievich Warkentin
andrey.warkentin@gmail.com
Cell: (+1) (847) 321-15-55


29.10.2007, в 12:00, Juan_2007 писал(а):

>
> I need to make a Project for the University and i wanted to know if  
> any of
> you guys, knew if the Grub left any information regarding the type of
> microprocessor that the computer is using.  i know the grub leaves
> information about the amount of memory and i suppose it does the  
> same with
> the microprocessor, if any of you have any clues about it, or where  
> can i
> get that info, i´ll be glad to know.  The GRUB webpage has an  
> incomplete
> manual, and the part of the memory map y incomplete so i can´t read  
> it from
> there.
>
> Thanks, Juan.
> -- 
> View this message in context: http://www.nabble.com/Grub-Memory- 
> Map---Processor-tf4709406.html#a13461040
> Sent from the Grub - Dev mailing list archive at Nabble.com.
>
>
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel


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Re: Grub Memory Map - Processor

[Robert Millan]

On Mon, Oct 29, 2007 at 12:14:53PM -0500, Andrei E. Warkentin wrote:
> Juan,
> 
> You may use the CPUID instruction to correctly identify the processor  
> your code is executing on. GRUB does not provide such information as  
> part of the Multiboot info.

Ah, uhm right.  I was thinking in terms of GRUB internals rather than multiboot
on my last reply.  Sorry for the confusion :-/

If you're working on an OS kernel, just use CPUID instruction like Andrei said.
You can see our cpuid command for an example on how to do it (license terms
apply if you copy actual code).

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)

Re: Grub Memory Map - Processor

[Robert Millan]

On Mon, Oct 29, 2007 at 10:00:43AM -0700, Juan_2007 wrote:
> 
> I need to make a Project for the University and i wanted to know if any of
> you guys, knew if the Grub left any information regarding the type of
> microprocessor that the computer is using.  i know the grub leaves
> information about the amount of memory and i suppose it does the same with
> the microprocessor, if any of you have any clues about it, or where can i
> get that info, i´ll be glad to know.  The GRUB webpage has an incomplete
> manual, and the part of the memory map y incomplete so i can´t read it from
> there.

Check the `cpuid' command.  It's quite incomplete (currently only detects
long mode flag), but the interface was designed with extensibility in mind
(patches to add detection for new cpuid stuff welcome).

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)