tree 5e5f21c2b541a3bde8a3ca54087bbf33bf23a1f3
parent d0d8b79a7e25d5b9bfe67359e27de71ab954a2a3
author Nico Huber <nico.h@gmx.de> 1528571667 +0200
committer Nico Huber <nico.h@gmx.de> 1557179599 +0000

gma registers: Separate 32- and 64-bit GTT access

With Broadwell the GTT layout changed significantly. Before, we had a
2MiB GTT with 32-bit entries. Now, it's a 8MiB GTT with 64-bit entries.
We used to abstract over that with configuration constants but that's
infeasible if we want to support Haswell and Broadwell with a single
binary (boards that support both processors exist).

Therefore, declare both GTT variants and decide based on the CPU which
one to use.

Change-Id: Ib6f21b71c434a9cbdd5cdfa3697da2b2e86750f4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/27056
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>