tree 711c06c0bf60d51f0d5b850e089b8200cfc8e9f0
parent 4943de63d05d1ee601716c5a40fcf67064ef10f9
author Simon Glass <sjg@chromium.org> 1594997299 -0600
committer Bin Meng <bmeng.cn@gmail.com> 1595209605 +0800

x86: mp: Allow running functions on multiple CPUs

Add a way to run a function on a selection of CPUs. This supports either
a single CPU, all CPUs, just the main CPU or just the 'APs', in Intel
terminology.

It works by writing into a mailbox and then waiting for the CPUs to notice
it, take action and indicate they are done.

When SMP is not yet enabled, this just calls the function on the main CPU.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>