soc/intel/tigerlake: Add SMRR Locking support

The SMRR MSRs can be locked, so that a further write to them will cause
a #GP.  This patch adds that functionality, but since the MSR is a
core-level register, it must only be done once per core; if the SoC has
hyperthreading enabled, then attempting to write the SMRR Lock bit on
the primary thread will cause a #GP when the secondary (sibling) thread
attempts to also write to this MSR.

BUG=b:164489598
TEST=Boot into OS, verify using `iotools rdmsr` that all threads have
the Lock bit set.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I4ae7c7f703bdf090144637d071eb810617d9e309
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45013
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kane Chen <kane.chen@intel.com>
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions