You can refer to 
http://www.intel.com/content/www/us/en/architecture-and-technology/unified-extensible-firmware-interface/efi-compatibility-support-module-specification-v098.html?wapkw=intel+framework+spec.

Thanks
Elvin Li

From: Rafael Machado [mailto:rafaelrodrigues.mach...@gmail.com]
Sent: Friday, August 22, 2014 7:42 PM
To: edk2-devel
Subject: Re: [edk2] Detect CSM Enabled

Thanks for the answer Mike.

Just one last question. As far as I could check, the information I can get 
using this protocol is really platform specific right ? I mean, some raw data 
that I need some documentation to know what each byte means.

Thanks
Rafael.

2014-08-21 11:46 GMT-03:00 Mike Maslenkin 
<miha...@parallels.com<mailto:miha...@parallels.com>>:
You can try to locate gEfiLegacyBiosProtocolGuid instance of
EFI_LEGACY_BIOS_PLATFORM_PROTOCOL installed.

On Thu, 2014-08-21 at 11:10 -0300, Rafael Machado wrote:
> Hi everyone.
>
>
> I'm having some problems with an application, but these issues just
> happen when CSM is enabled.
>
>
> I've tried to find some protocol that I can use to detect is a system
> has CSM enabled, but didn't find anything.
> Does anyone know some protocol that I can use to have this kind of
> information ?
>
>
> Thanks and Regards
> Rafael R. Machado
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