tree 95f9b6c7c7f3bc50e1d6e9b224b37c5e557c58be
parent f91762b2421d556545b14ea100798f658edaac00
author Andre Przywara <andre.przywara@arm.com> 1602114230 +0100
committer Andre Przywara <andre.przywara@arm.com> 1613040205 +0000

plat/arm: juno: Refactor juno_getentropy()

Currently we use the Juno's TRNG hardware entropy source to initialise
the stack canary. The current function allows to fill a buffer of any
size, but we will actually only ever request 16 bytes, as this is what
the hardware implements. Out of this, we only need at most 64 bits for
the canary.

In preparation for the introduction of the SMCCC TRNG interface, we
can simplify this Juno specific interface by making it compatible with
the generic one: We just deliver 64 bits of entropy on each call.
This reduces the complexity of the code. As the raw entropy register
readouts seem to be biased, it makes sense to do some conditioning
inside the juno_getentropy() function already.
Also initialise the TRNG hardware, if not already done.

Change-Id: I11b977ddc5417d52ac38709a9a7b61499eee481f
Signed-off-by: Andre Przywara <andre.przywara@arm.com>