binaryPI: Disable CAR with empty stack

Calling disable_cache_as_ram() with valuables in stack is not
a stable solution, as per documentation AMD_DISABLE_STACK
should destroy stack in cache.

While we still preserve cache contents (there is wbinvd deep
inside AMD_DISABLE_STACK macro), we now actually do a stack
switch and much more closely meet the specification of CAR
teardown sequence in AGESA specifications.

We now somewhat incorrectly include files from agesa/ tree,
but the whole agesawrapper.c file removal will address the
issue of overall directory layout.

Change-Id: I2bac098099c1caffea181356c63924f4b5a93b54
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/18525
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

0 files changed, 0 insertions, 0 deletions