On May 13, 2013, at 2:02 AM, Jeffrey Chou <[email protected]> wrote:
> Hi Daryl,
>
> Thanks for your advice. Currently I just have the workaround that my UEFI
> driver invoking a application by LoadImage or ShellExecute, of cause the
> application should be built with StdLib.
> But I encountered some problems when using LoadImage and ShellExecute:
>
> Case 1:
> For ShellExecute, I have an absolute file path of application for parameter
> in ShellExecute. I always get EFI_SUCCESS from Status, but it seems that the
> StdLibApp.efi is never executed.
> My UEFI Driver--ShellExecute-->StdLibApp
> e.g.
> ShellExecute (ImageHandle, L"folder1\folder2\StdLibApp.efi", FALSE, NULL,
> &Status);
>
Why would you expect a call ShellExecute from a driver to work? ShellExecute is
a wrapper that calls a protocol produced by the shell. So by definition if the
shell is not present it will not work. Your driver can't assume that the shell
is present.
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/ShellPkg/Library/UefiShellLib/UefiShellLib.c
> Case 2:
> For LoadImage, also have the absolute file path for LoadImage function.
> My UEFI Driver--LoadImage/StartImage-->StdLibApp
> e.g.
> gBS->LoadImage(FALSE, ImageHandle, FilePath, NULL, 0, &Handle);
> gBS->StartImage(Handle, NULL, NULL );
> But I got an error EFI_STATUS from StartImage.
If the return value is not EFI_INVALID_PARAMETER or EFI_SECURITY_VIOLATION then
EFI_STATUS is coming from the image.
> I tried to change the StdLibApp to a PURE EFI Application, it works.
> Case 3:
> Base on the result from case 2, an idea as below.
> My UEFI Driver--LoadImage/StartImage-->PureEFIApp--ShellExecute-->StdLibApp
>
> Unfortunately, also failed in case 3. I got the situation when calling
> ShellExeute which is same as case 1.
>
> Maybe my method and idea are a bit tortuous, but above are solutions I can
> think of so far.
> Now I am back to case 2 and studying any solution can load a StdLibApp in an
> UEFI Driver.
>
Maybe you didn't understand the implication of Daryl's answer. A Shell
Application, requires the actual Shell to be present. A driver can't depend on
the shell. So non of this stuff you are trying is going to work.
You need to port your driver to not use C lib APIs that are not available and
use edk2 library functions that are available, or you need create a version of
the C lib that implements the functions you need that does not depend on the
shell.
Thanks,
Andrew Fish
> Thanks
>
> Jeffrey
> 2013/5/11 Mcdaniel, Daryl <[email protected]>
> Jeffrey,
>
>
>
> The current version of StdLib is designed to only work as a Shell
> Application. Many of the services that StdLib relies upon are not available
> until the BDS phase, or later. As such, it is strongly recommended that
> StdLib not be used in drivers. It is my desire to provide a “standalone”
> version of StdLib in the future, but it is not currently scheduled.
>
>
>
> Daryl McDaniel
>
> “In the pun, two strings of thought are tangled into one acoustic knot.”
> -- Arthur Koestler
>
>
>
>
> From: Jeffrey Chou [mailto:[email protected]]
> Sent: Tuesday, May 07, 2013 3:20 AM
> To: edk2-devel
> Subject: [edk2] Using StdLib in UEFI_DRIVER Type
>
>
>
> Hi all,
>
>
>
> I am trying to use StbLib in an uefi driver module, and it seems the StbLib
> is only supported on UEFI_APPLICATION. So I have an idea that my uefi driver
> invoking an uefi application built with StdLib thru ShellExecute or
> LoadImage. But I am facing a problem that I don't know how to pass auguments
> to the application (in loadimage) and get the return value from the
> application. Any suggestions?
>
>
>
> Thanks
>
> Jeffrey
>
>
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