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authorAaron Durbin <adurbin@chromium.org>2017-01-10 17:44:42 -0600
committerAaron Durbin <adurbin@chromium.org>2017-01-12 18:28:12 +0100
commitf56c7787ba34bf9ee7799a77803c1a77b2d1be27 (patch)
tree06b5ad1ec634f61662b7fe52303b3c849506d7ca /src/include/tpm_lite
parent17b66c384618c52185fa1ca9ef84101e84b0f4be (diff)
downloadcoreboot-f56c7787ba34bf9ee7799a77803c1a77b2d1be27.tar.xz
google/chromeos: disable platform hierarchy on resume for TPM2
On Chrome OS devices that use TPM2 parts the platform hierarchy is disabled by the boot loader, depthcharge. Since the bootloader isn't involved in resuming a suspended machine there's no equivalent action in coreboot to disable the platform hierarchy. Therefore, to ensure consistent state in resume the platform hierarchy in the TPM2 needs to be disabled as well. For systems that resume using the firmware the platform hierarchy is disabled when utilizing TPM2 devices. BUG=chrome-os-partner:61097 BRANCH=reef TEST=Suspend and resume. Confirmed 'stop trunksd; tpmc getvf; start trunksd' shows that phEnable is 0. Change-Id: I060252f338c8fd68389273224ee58caa99881de8 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/18096 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Diffstat (limited to 'src/include/tpm_lite')
-rw-r--r--src/include/tpm_lite/tlcl.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/tpm_lite/tlcl.h b/src/include/tpm_lite/tlcl.h
index 8ea5564ecb..95bae77f42 100644
--- a/src/include/tpm_lite/tlcl.h
+++ b/src/include/tpm_lite/tlcl.h
@@ -151,4 +151,9 @@ uint32_t tlcl_extend(int pcr_num, const uint8_t *in_digest,
*/
uint32_t tlcl_get_permanent_flags(TPM_PERMANENT_FLAGS *pflags);
+/**
+ * Disable platform hierarchy. Specific to TPM2. The TPM error code is returned.
+ */
+uint32_t tlcl_disable_platform_hierarchy(void);
+
#endif /* TPM_LITE_TLCL_H_ */