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Require the Memory Attribute Protocol if Enhanced Memory Protection is supported #170

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12 changes: 12 additions & 0 deletions source/chapter2-uefi.rst
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Expand Up @@ -115,11 +115,23 @@ All of the following UEFI elements are required for EBBR compliance.
- .. versionadded:: 2.1.0

Required on RISC-V platforms. (:UEFI:`2.3.7.1` and [RVUEFI]_)
* - `EFI_MEMORY_ATTRIBUTE_PROTOCOL`
- Required if the firmware supports Enhanced Memory Protection. [#EMPNote]_
(:UEFI:`37.7`)

.. [#COLNote] The `EFI_UNICODE_COLLATION_PROTOCOL` defined in :UEFI:`21.1` is
also sometimes called the `EFI_UNICODE_COLLATION2_PROTOCOL` or even the
`EFI_UNICODE_COLLATION_PROTOCOL2`.

.. [#EMPNote] Enhanced Memory Protection increases security by tightening
memory permissions. This includes making sure that writable memory is not
also executable (W^X).

The `EFI_MEMORY_ATTRIBUTE_PROTOCOL` allows boot components to configure
memory permissions.

https://microsoft.github.io/mu/WhatAndWhy/enhancedmemoryprotection/

When the platform has a graphical console device, it is recommended that
firmware implements the `EFI_GRAPHICS_OUTPUT_PROTOCOL` as defined in
:UEFI:`12.9`.
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