On Jan 3, 2013, at 8:13 AM, 雅虎邮箱 <[email protected]> wrote:
> Hi All,
> I got a trouble during learing UEFI that when I tried to retrive more
> information about protocols defined in the path of MdePkg\Include\Protocol, I
> only see the header files but not find the corresponding file of *.c
Think of the protocol .h file as the public class definition. The EFI_GUID
global extern in the .h file is the name that is set to the #define
*_PROTOCOL_GUID value.
So for example if you look at
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Include/Protocol/BlockIo.h
you can search the code base for gEfiBlockIoProtocolGuid to see the producers
and consumers of Block IO protocol.
The modules that produce or consume the Block IO protocol will include
gEfiBlockIoProtocolGuid in the [Protocols] section of their INF file and this
will cause the build generated AutoGen.c file to contain:
EFI_GUID gEfiBlockIoProtocolGuid = EFI_BLOCK_IO_PROTOCOL_GUID
Producers will use gBS->InstallProtocolInterface() or
gBS->InstallMultipleProtocolInterfaces() to register the protocol instance(s)
that they produce.
Consumers will use gBS->OpenProtocol(), gBS->HandleProtocol(), or
gBS->LocolProtocol() to discover the protocol instance.
In both the consumers and producers you will see &gEfiBlockIoProtocolGuid
passed as an argument.
Thanks,
Andrew Fish
>
> Could you offer me some information about this question?!
> I am looking forward to your reply!
>
> Thanks & Best Regards!
>
> Justin Lin
> From TJ China
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