tree 227c87e026f569b6295786eaba481650c6cdb606
parent 34bfe8eff895b864247d923ce37110a9053592ee
author Patrick Rudolph <patrick.rudolph@9elements.com> 1729689614 +0200
committer Tom Rini <trini@konsulko.com> 1730071453 -0600

armv8: cpu: Enable ACPI parking protocol

Update the generic entry point code to support the ACPI parking protocol.
The ACPI parking protocol can be used when PSCI is not available to bring
up secondary CPU cores.

When enabled secondary CPUs will enter U-Boot proper and spin in their own
4KiB reserved memory page, which also acts as mailbox with the OS to
release the CPU.

TEST: Boots all CPUs on qemu-system-aarch64 -machine raspi4b

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Simon Glass <sjg@chromium.org>