On Sep 6, 2014, at 3:52 AM, stanley.ganyezu <[email protected]> wrote:
> Hi Experts,
> Currently, X86 cpu run SMM in 32-bit. There are a lot of limitation
> about 32-bit. I want to run SMM in 64-bit to access whole cpu address
> space，but I can’t figure it out.
UEFI/PI systems run SMM in 64-bit mode? See UEFI Platform Initialization
Specification Version 1.3. http://www.uefi.org/specifications
> Can you give me some tips? Any suggestion will be appreciated.
>
>
Put the system in Long mode, this requires page tables. The DXE IPL and 64-bit
SEC in Ovmf both have code that transitions to 64-bit long mode.
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Core/DxeIplPeim/
https://svn.code.sf.net/p/edk2/code/trunk/edk2/OvmfPkg/ResetVector/
It is really dangerous to modify the SMM code if you do not fully understand
it, since SMM runs at a higher privilege than the OS it is an attack point that
the OS can not defend against.
Thanks,
Andrew Fish
>
>
>
>
>
> Best wishes,
> Stanley
>
>
> ------------------------------------------------------------------------------
> Slashdot TV.
> Video for Nerds. Stuff that matters.
> http://tv.slashdot.org/_______________________________________________
> edk2-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Slashdot TV.
Video for Nerds. Stuff that matters.
http://tv.slashdot.org/
_______________________________________________
edk2-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/edk2-devel
