Hello Andrew
Thanks again for your help.
On Wed, Feb 5, 2014 at 11:10 AM, Andrew Fish <[email protected]> wrote:
>
> On Feb 5, 2014, at 10:27 AM, John Davis <[email protected]> wrote:
>
>
<Stuff snipped>
Wow, that is good info you gave me. I was surprised that PEView ( a free
program) actually decodes the Subsystem field in the IMAGE_OPTIONAL_HEADER.
DEBUG_VS2010x86/IA32/MyHello/Output/MyHello.efi is 0xa
IMAGE_SUBSYSTEM_EFI_APPLICATION
DEBUG_VS2010x86/FV/Ffs/"GUID?"Tcp4Dxe/<no .efi files here, but take the
.p32 file and strip off leading bytes to the dos header and save to diff
file and edit> is 0xB IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER
DEBUG ditto/"GUID"Reset/ditto decodes to EFI_BOOT_SERVICE_DRIVER
DEBUG ditto/"GUID"Timer/dito ditto
DEBUG ditto/"GUID"Cpu/ditto ditto
DEBUG ditto/"GUID"CapsuleRuntimeDxe/ 0xc IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER
Odd, I figured the Dxe vs no Dxe suffix would correspond to different image
types.
//
> // PE32+ Subsystem type for EFI images
> //
> #define EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION 10
> #define EFI_IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER 11
> #define EFI_IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER 12
>
>
>
So things which make sense:
o CapsuleRuntimeDxe is a runtime driver. This jives with chapter 5 of
Beyond Bios where it says capsule services is part of the runtime services.
o MyHello application which is in the seperate folder is a Application,
since it was presented as an application code and discussed in the book as
an application.
o Cpu, Reset, Tcp are boottime drivers.
Things which don't make sense:
o Timer is boottime but its mentioned as a runtime service.
o Why some drivers end with Dxe suffix and others don't. "GUID"Reset vs
"GUID"CapsuleRuntimeDxe
> Thanks,
>
> Andrew Fish
>
>
> --
> John F. Davis
> 6 Kandes Court
> Durham, NC 27713
> 919-888-8358
>
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--
John F. Davis
6 Kandes Court
Durham, NC 27713
919-888-8358
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------------------------------------------------------------------------------
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Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
Read the Whitepaper.
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