From f56c7787ba34bf9ee7799a77803c1a77b2d1be27 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Tue, 10 Jan 2017 17:44:42 -0600 Subject: 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 Reviewed-on: https://review.coreboot.org/18096 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Duncan Laurie --- src/include/tpm_lite/tlcl.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/include') 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_ */ -- cgit v1.2.3