There is also the TRNG FW API, which is an architected SMC firmware interface:

https://developer.arm.com/documentation/den0098/latest/


From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Rebecca Cran via groups.io <rebecca=nuviainc.com@groups.io>
Sent: Tuesday, December 8, 2020, 11:33 PM
To: devel@edk2.groups.io
Cc: rfc@edk2.groups.io; Jiewen Yao; Rahul Kumar
Subject: [edk2-devel] RFC: Adding support for ARM (RNDR etc.) to RngDxe

Currently, RngDxe in SecurityPkg only supports Intel, with RdRand support.


This RFC is to start a discussion about adding support for ARM.


I have a Git branch with support for the optional ARMv8.5 RNDR
instruction at https://github.com/bcran/edk2/commits/bcran-rndr which
moves the existing Intel support into a Rand directory, and adds code to
support RNDR in a new AArch64 directory.

There are other RNG implementations available for ARM, including
platform-specific approaches on Graviton
(https://lwn.net/Articles/790304/) and other platforms, so a more
thorough rearchitecting/redesign may be desired.


--
Rebecca Cran








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