can somebody explain how linux support 64G memory

can somebody explain how linux support 64G memory

[michaelc]

Hi,
   How does linux support more than 4G memory? I 've read the
   documentation of  Intel IA-32 Architecture, I knew that OS
   just address up to 4G physical address space, If OS want to
   access additional 4-GByte section of physical memory, it must
   change the pointer in register CR3 or entries in the
   page-directory-pointer table. That means that Linux just has
   up to 4-GByte page mapping at one time , is that right?

  

-- 
Best regards,
 michael chen                          mailto:michaelc@turbolinux.com.cn

Re: can somebody explain how linux support 64G memory

[Robert Read]

There are two ways, the PAE flag and the PSE-36 feature introduced in
P3. These extensions are documented in the IA-32 Intel Architecture
Software Developer's Manuals, which you can find here:

http://developer.intel.com/design/Pentium4/manuals/ 

Look in Volume 3, Chapter 3 for this info.

robert


On Wed, Feb 21, 2001 at 10:44:30AM +0800, michaelc wrote:
> Hi,
>    How does linux support more than 4G memory? I 've read the
>    documentation of  Intel IA-32 Architecture, I knew that OS
>    just address up to 4G physical address space, If OS want to
>    access additional 4-GByte section of physical memory, it must
>    change the pointer in register CR3 or entries in the
>    page-directory-pointer table. That means that Linux just has
>    up to 4-GByte page mapping at one time , is that right?
> 
>   
> 
> -- 
> Best regards,
>  michael chen                          mailto:michaelc@turbolinux.com.cn
> 
> 
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