diff options
| author | Vadim Bendebury <vbendeb@chromium.org> | 2017-03-22 16:01:53 -0700 |
|---|---|---|
| committer | Vadim Bendebury <vbendeb@chromium.org> | 2017-03-23 23:49:58 +0100 |
| commit | 021ec2819b2200eabbaca5b6873f7024c2bd9434 (patch) | |
| tree | 2c4b65ed7901b30495d373961b208dfedb8e3842 /src/include/tpm_lite | |
| parent | c5168832cd5e8a052e835cbbfa702f0d5649a98c (diff) | |
cr50: add unmarshaling of vendor commands and process 'enable_update'
The upcoming Cr50 firmware changes will require the AP to enable the
previously downloaded Cr50 firmware update(s).
A new vendor command (TPM2_CR50_SUB_CMD_TURN_UPDATE_ON) is used for
that. The command accepts one parameter - a timeout value in range of
0 to 1000 ms.
When processing the command the Cr50 checks if the alternative RO or
RW image(s) need to be enabled, and if so - enables them and returns
to the host the number of enabled headers.
If the vendor command requested a non-zero timeout, the Cr50 starts
a timer to trigger system reboot after the requested timeout expires.
The host acts on the number of enabled headers - if the number is
nonzero, the host prepares the device to be reset and waits for the
Cr50 to reboot the device after timeout expires.
This patch also adds more formal vendor command
marshaling/unmarshaling to make future additions easier.
BRANCH=gru,reef
BUG=b:35580805
TEST=with the actual user of this code in the next patch verified that
the cr50 update is enabled as expected.
Change-Id: Ic76d384d637c0eeaad206e0a8242cbb8e2b19b37
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://review.coreboot.org/18945
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/include/tpm_lite')
| -rw-r--r-- | src/include/tpm_lite/tlcl.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/include/tpm_lite/tlcl.h b/src/include/tpm_lite/tlcl.h index c8e68d28e9..8dd5d80685 100644 --- a/src/include/tpm_lite/tlcl.h +++ b/src/include/tpm_lite/tlcl.h @@ -162,4 +162,16 @@ uint32_t tlcl_disable_platform_hierarchy(void); */ uint32_t tlcl_cr50_enable_nvcommits(void); +/** + * CR50 specific tpm command to restore header(s) of the dormant RO/RW + * image(s) and in case there indeed was a dormant image, trigger reboot after + * the timeout milliseconds. Note that timeout of zero means "NO REBOOT", not + * "IMMEDIATE REBOOT". + * + * Return value indicates success or failure of accessing the TPM; in case of + * success the number of restored headers is saved in num_restored_headers. + */ +uint32_t tlcl_cr50_enable_update(uint16_t timeout_ms, + uint8_t *num_restored_headers); + #endif /* TPM_LITE_TLCL_H_ */ |