UPSTREAM: cpu/x86/mp: pass pointers to structures for AP callbacks
In order to extend the MP callback infrastructure prepare for
easier changes by making the AP callback get signalled by a
single pointer to a local variable on the signaller's stack.
When the APs see the callback they will copy the structure
to a local variable and then set the acknowledgement by
clearing out the slot.
The reading and writing to the slots were implemented using inline
assembly which forces a memory access and a compiler barrier.
BUG=b:74436746
Change-Id: I26a79256691edbed431d6b9232c7cc9ecc8ef4de
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Original-Commit-Id: 223fb436fe89a265f4ddbe7f8fe38a35b47a8253
Original-Change-Id: Ia46133a49c03ce3ce0e73ae3d30547316c7ec43c
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/26043
Original-Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-on: https://chromium-review.googlesource.com/1057612
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
1 file changed
