Re: How to get fs index from controller handle.

["Carsey, Jaben" <jaben.carsey@intel.com>]

That's the way to do it.  the hard work is around finding the DevicePath for the application you want to run to pass to LoadImage.

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> Amit kumar
> Sent: Thursday, April 06, 2017 9:45 AM
> To: Andrew Fish <afish@apple.com>
> Cc: edk2-devel@lists.01.org
> Subject: Re: [edk2] How to get fs index from controller handle.
> Importance: High
> 
> Hi,
> 
> 
> Can i use gbs->loadimage() and gbs->startimage() to load an efi application
> and execute it.
> 
> Suppose i have a app1.efi and from app1.efi i want to execute app2.efi.
> 
> Or is there some other way to do it ?
> 
> Not considering ShellExecute();
> 
> Amit
> 
> ________________________________
> From: afish@apple.com <afish@apple.com> on behalf of Andrew Fish
> <afish@apple.com>
> Sent: Thursday, April 6, 2017 4:39:22 PM
> To: Amit kumar
> Cc: edk2-devel@lists.01.org
> Subject: Re: [edk2] How to get fs index from controller handle.
> 
> 
> On Apr 6, 2017, at 3:30 AM, Amit kumar
> <akamit91@hotmail.com<mailto:akamit91@hotmail.com>> wrote:
> 
> Hi,
> 
> I want to get the fs index from the controller handle.
> e.g In map command i see my controller is mapped to fs10.
> So i there any API i can use in my code to get the fs index( which is 10 as in
> example) from the controller handle.
> 
> 
> Amit,
> 
> It is important to remember that fs0:, and the other device names are a Shell
> concept and not an EFI concept. So they only exist in the context of the shell.
> 
> I took a quick look and I did not see an easy way to do this with the current
> Shell APIs.
> 
> In the older Shell you could use this  protocol  EfiShellEnvironment2 Protocol
> has a function that converts a EFI_DEVICE_PATH_PROTOCOL (would be on
> your controller handle) to a CHAR16. Thus you can get the volume name the
> Shell would display to the user. I don't the index exists as a concept.  So
> EFI_SHELL_ENVIRONMENT2.GetFsName() and
> EFI_SHELL_ENVIRONMENT2.GetFsDevicepath() are the closest thing I can
> think of.
> https://github.com/tianocore/edk2/blob/master/ShellPkg/Include/Protocol/
> EfiShellEnvironment2.h#L812
> 
> The only problem with that is EfiShellEnvironment2 is not produced by the
> Shell by default.
> 
>   ## This flag is used to control the protocols produced by the shell
>   #  If TRUE the shell will produce EFI_SHELL_ENVIRONMENT2 and
> EFI_SHELL_INTERFACE
> 
> gEfiShellPkgTokenSpaceGuid.PcdShellSupportOldProtocols|FALSE|BOOLEAN
> |0x00000002
> 
> I've use the EFI_SHELL_ENVIRONMENT2 in the past to enable a non Shell
> application to print out volume names that match the map command of the
> shell. Hopefully some one knows how to do this in the modern Shell?
> 
> Thanks,
> 
> Andrew Fish
> 
> Regards
> Amit
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