feat(rmmd): el3 token sign during attestation
Add required SMCs by RMM to push attestation signing requests to EL3
and get responses. EL3 may then choose to push these requests to a HES
as suitable for a platform. This patch also supports the new
RMM_EL3_FEATURES interface, that RMM can use to query for support for
HES based signing. The new interface exposes a feature register with
different bits defining different discoverable features. This new
interface is available starting the 0.4 version of the RMM-EL3
interface, causing the version to bump up. This patch also adds a
platform port for FVP that implements the platform hooks required to
enable the new SMCs, but it does not push to a HES and instead copies a
zeroed buffer in EL3.
Change-Id: I69c110252835122a9533e71bdcce10b5f2a686b2
Signed-off-by: Raghu Krishnamurthy <raghupathyk@nvidia.com>
diff --git a/services/std_svc/rmmd/rmmd_private.h b/services/std_svc/rmmd/rmmd_private.h
index 6d3b5ec..0ce104d 100644
--- a/services/std_svc/rmmd/rmmd_private.h
+++ b/services/std_svc/rmmd/rmmd_private.h
@@ -51,6 +51,8 @@
uint64_t *remaining_len);
int rmmd_attest_get_signing_key(uint64_t buf_pa, uint64_t *buf_size,
uint64_t ecc_curve);
+uint64_t rmmd_el3_token_sign(void *handle, uint64_t x1, uint64_t x2,
+ uint64_t x3, uint64_t x4);
/* Assembly helpers */
uint64_t rmmd_rmm_enter(uint64_t *c_rt_ctx);