EDK2 UEFI Specification and Revision

EDK2 UEFI Specification and Revision

[sergestus]

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When runs "ver" command in EFI Shell command line it shows UEFI specification and revision. The question is how to find out what UEFI specification and revision does EDK2 support?

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Re: [edk2-devel] EDK2 UEFI Specification and Revision

[Andrew Fish]

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The header in the EFI_SYSTEM_TABLE (gST)  carries the UEFI Specification version. It is filled in by the DXE Core when it produces the EFI System Table. 

$ git grep EFI_SYSTEM_TABLE_REVISION
MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c:126:    EFI_SYSTEM_TABLE_REVISION,                                            // Revision
MdeModulePkg/Universal/SetupBrowserDxe/Setup.h:74:#define EFI_IFR_SPECIFICATION_VERSION  (UINT16) (((EFI_SYSTEM_TABLE_REVISION >> 16) << 8) | (((EFI_SYSTEM_TABLE_REVISION & 0xFFFF) / 10) << 4) | ((EFI_SYSTEM_TABLE_REVISION & 0xFFFF) % 10))
MdePkg/Include/Uefi/UefiSpec.h:1780:#define EFI_SYSTEM_TABLE_REVISION       EFI_2_70_SYSTEM_TABLE_REVISION
MdePkg/Include/Uefi/UefiSpec.h:1781:#define EFI_SPECIFICATION_VERSION       EFI_SYSTEM_TABLE_REVISION

$ git grep EFI_2_70_SYSTEM_TABLE_REVISION
MdePkg/Include/Uefi/UefiSpec.h:1769:#define EFI_2_70_SYSTEM_TABLE_REVISION  ((2 << 16) | (70))
MdePkg/Include/Uefi/UefiSpec.h:1780:#define EFI_SYSTEM_TABLE_REVISION       EFI_2_70_SYSTEM_TABLE_REVISION

Thanks,

Andrew Fish

> On Oct 21, 2019, at 1:15 AM, sergestus@yandex.ru wrote:
> 
> When runs "ver" command in EFI Shell command line it shows UEFI specification and revision. The question is how to find out what UEFI specification and revision does EDK2 support?
> 


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Re: [edk2-devel] EDK2 UEFI Specification and Revision

[sergestus]

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Hi Andrew,

Thank you, for the detail answer. It seems this is what I'm looking for. Now I've found the UEFI specification of the UEFI application I build, and it appears that the specification of the application is greater than the EFI Shall specification it is going to be used with. Is it ok, or I should find the EDK2 with UEFI specification exactly the same as the EFI Shell specification and rebuild my EFI app?

Thank you,
Sergey

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Re: [edk2-devel] EDK2 UEFI Specification and Revision

[Andrew Fish]

You can check the revision and only depend on those features if they are implied by the UEFI revision?
> On Oct 22, 2019, at 3:13 AM, sergestus@yandex.ru wrote:
> 
> Hi Andrew,
> 
> Thank you, for the detail answer. It seems this is what I'm looking for. Now I've found the UEFI specification of the UEFI application I build, and it appears that the specification of the application is greater than the EFI Shall specification it is going to be used with. Is it ok, or I should find the EDK2 with UEFI specification exactly the same as the EFI Shell specification and rebuild my EFI app?
> 
> Thank you,
> Sergey

Re: [edk2-devel] EDK2 UEFI Specification and Revision

[sergestus]

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My app (UEFI spec 2.7) uses following protocols:
EFI_BOOT_SERVICES revision EFI_SPECIFICATION_VERSION
EFI_FILE_PROTOCOL revision 0x00020000
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL 0x00010000
EFI_PEI_SERVICES - not found in UEFI specificaion
EFI_PEI_CPU_IO_PPI - not found in UEFI specificaion

UEFI Specification 2.4 protocols:
EFI_BOOT_SERVICES revision EFI_SPECIFICATION_VERSION
EFI_FILE_PROTOCOL revision 0x00020000
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL 0x00010000

So the main services API EFI_BOOT_SERVICES, where I'm using few common functions (OpenProtocol, AllocatePool...) differs from the EFI shell where app is using. Also there are protocols such as EFI_PEI_SERVICES and EFI_PEI_CPU_IO_PPI about which differences I can say nothing, so it is batter to find EDK2 with UEFI spec 2.4.

Thank you,
Sergey

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