tree 7312579720192b141553a3e2c6defe9ac86a6b93
parent bb801857eaf21365402a4748296c05cb3c6e861f
author Boyan Karatotev <boyan.karatotev@arm.com> 1727366409 +0100
committer Boyan Karatotev <boyan.karatotev@arm.com> 1738568278 +0000

refactor(cpus): undo errata mitigations

The workarounds introduced in the three patches starting at
888eafa00b99aa06b4ff688407336811a7ff439a assumed that any powerdown
request will be (forced to be) terminal. This assumption can no longer
be the case for new CPUs so there is a need to revisit these older
cores. Since we may wake up, we now need to respect the workaround's
recommendation that the workaround needs to be reverted on wakeup. So do
exactly that.

Introduce a new helper to toggle bits in assembly. This allows us to
call the workaround twice, with the first call setting the workaround
and second undoing it. This is also used for gelas' an travis' powerdown
routines. This is so the same function can be called again

Also fix the condition in the cpu helper macro as it was subtly wrong

Change-Id: Iff9e5251dc9d8670d085d88c070f78991955e7c3
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>