soc/amd/picasso: pass verstage timestamps to x86

Initialize timestamp table with data from psp_verstage on bootblock.

PSP keeps its own timestamp and pass it in transfer_buffer. However PSP
timestamp and TSC may be out of sync so we can't just merge two tables
without modification.

info->timestamp contains PSP's clock value (in us) when x86 processor
released and base_timestamp contains TSC value when bootblock is
started. The time between x86 release and bootblock entry should be very
short so we can think those two happened at the same time and use them
for sync.

In some cases there will be underflow in timestamp entries but cbmem
utility can handle wrap-over in entries. Few timestamp values including
1st timestamp can be very large but we can still get the time spent on
boot without any problem.

BUG=b:159220781, b:167148121, b:171422583
BRANCH=zork
TEST=boot to kernel, run 'cbmem -t' and check verstage timestamps are
included in the result.

Change-Id: I5e89bb54f478153fb40ba51b5ab61fa20af3b99a
Signed-off-by: Kangheui Won <khwon@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45059
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions