The cr50 code might need access to certain variables stored in the TPM
NVMEM. In particular the upcoming FWMP support will require reading
the NVMEM FWMP space.
This patch adds a generic function which allows to access TPM NVMEM
spaces. The implementation was borrowed from NV_REad.c in the tpm2
tree, the only difference being that the location, if present, is read
unconditionally, without checking access controls.
The API accepts the NVMEM index in Chrome OS scope and maps it into
TPM2 specification's NVMEM index space based at HR_NV_INDEX. The
definitions are included straight from the tpm2 tree.
BRANCH=none
BUG=chrome-os-partner:62489, chrome-os-partner:62205
TEST=this code is not yet even being compiled, tested with the next
patch.
Change-Id: I8bcfd8637c192249780634491f30e4a28229984f
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/457823
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>
(cherry picked from commit 61f61b368e)
Reviewed-on: https://chromium-review.googlesource.com/459225
a733e02fd4