tree f3ac20451523ecba90dd44a02a529cd500656f98
parent 2b138c6b314c458b70c09b628acf0c055dd25a0b
author Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> 1667485340 +0000
committer Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> 1668420536 +0000

refactor(trng): discarding the used entropy bits

This patch discards all the used entropy bits from the global memory
pool after being delivered to the requester (lower exception levels) by
overwriting them with zeroes.
It effectively implements the requirement, as part of TRNG FW interface
listed at DEN0098 (section 1.2).
https://developer.arm.com/documentation/den0098/latest

Change-Id: I447cbccc1a8ad972418a3569c99f010189d4b2f6
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>