The definitions are from PI spec. Seems the latest PI spec hasn't been updated 
to add ACPI 5.0 definition.

Thanks,
Hot

From: Andrew Fish [mailto:af...@apple.com]
Sent: Wednesday, December 04, 2013 0:44
To: edk2-devel@lists.sourceforge.net
Subject: [edk2] Is there a reason that the AcpiSystemDescriptionTable protocol 
does not have a value for ACPI 5.0?

Is there a reason that the AcpiSystemDescriptionTable protocol does not have a 
value for ACPI 5.0?

>From 
>https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Include/Protocol/AcpiSystemDescriptionTable.h

#define EFI_ACPI_TABLE_VERSION_NONE (1 << 0)

#define EFI_ACPI_TABLE_VERSION_1_0B (1 << 1)

#define EFI_ACPI_TABLE_VERSION_2_0  (1 << 2)

#define EFI_ACPI_TABLE_VERSION_3_0  (1 << 3)

#define EFI_ACPI_TABLE_VERSION_4_0  (1 << 4)

Thanks,

Andrew Fish
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