On May 14, 2013, at 12:05 AM, Jeffrey Chou <[email protected]> wrote:
> Thanks Andrew,
> Maybe my question is not complete. My UEFI Driver is loaded via another UEFI
> Application(Main.efi) with LoadImage function. So based on your advice, I
> modified my Main.efi to pass its ImageHandle to my UEFI Driver, because I
> think the ImageHandle should be application-based,
There is no such thing in EFI as an "application-based" image handle.
The only difference in EFI between an Application and a Driver in EFI is that
an application is loaded into EfiLoaderCode/EfiLoaderData memory types and the
memory is freed back when the application return. The EFI driver is loaded into
EfiBootServicesCode/EfiBootServicesData (or
EfiRuntimeServicesCode/fiRuntimeServicesData) and if the driver returns
EFI_SUCCESS the memory is not freed back when it returns.
See CoreLoadPeImage() :
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdeModulePkg/Core/Dxe/Image/Image.c
> and then a ShellExecute used the ImageHandle in My UEFI Driver. It works.
> The flow would be:
> Main.efi --LoadImage--> UEFI Driver --ShellExecute(with Main.efi's
> ImageHandle)--> StdLibApp
>
As we have mentioned before the shell produces protocols that export shell
services to stand alone shell applications. It looks to me that Shell
Applications assume that these magic protocols are are on the image handle. See
ShellLibConstructorWorker() :
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/ShellPkg/Library/UefiShellLib/UefiShellLib.c
> Thanks
>
Is your goal to make a driver that no one can use?
Given your "driver" depends on being a shell application why not just convert
it to a shell application then you don't need to do all your crazy stuff.
Thanks,
Andrew Fish
> Jeffrey
> 2013/5/13 Andrew Fish <[email protected]>
>
> 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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