feat(rmmd): add RMM_MECID_KEY_UPDATE call
With this addition, TF-A now has an SMC call to handle the
update of MEC keys associated to MECIDs.
The behavior of this newly added call is empty for now until an
implementation for the MPE (Memory Protection Engine) driver is
available. Only parameter sanitization has been implemented.
Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: I2a969310b47e8c6da1817a79be0cd56158c6efc3
diff --git a/docs/porting-guide.rst b/docs/porting-guide.rst
index 0f0dedd..327c67b 100644
--- a/docs/porting-guide.rst
+++ b/docs/porting-guide.rst
@@ -2350,6 +2350,24 @@
When ENABLE_RME is disabled, this function is not used.
+Function : plat_rmm_mecid_key_update() [when ENABLE_RME == 1]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ Argument : uint16_t
+ Return : int
+
+This function is invoked by BL31's RMMD when there is a request from the RMM
+monitor to update the tweak for the encryption key associated to a MECID.
+
+The first parameter (``uint16_t mecid``) contains the MECID for which the
+encryption key is to be updated.
+
+Return value is 0 upon success and -EFAULT otherwise.
+
+This function needs to be implemented by a platform if it enables RME.
+
Function : plat_rmmd_el3_token_sign_push_req() [mandatory when RMMD_ENABLE_EL3_TOKEN_SIGN == 1]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~