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?
>