feat(rme): add dummy platform token to RMMD
Add a dummy platform token to RMMD and return it on request. The
platform token is requested with an SMC with the following parameters:
* Fid (0xC40001B3).
* Platform token PA (the platform token is copied at this address by
the monitor). The challenge object needs to be passed by
the caller in this buffer.
* Platform token len.
* Challenge object len.
When calling the SMC, the platform token buffer received by EL3 contains
the challenge object. It is not used on the FVP and is only printed to
the log.
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
Signed-off-by: Subhasish Ghosh <subhasish.ghosh@arm.com>
Change-Id: I8b2f1d54426c04e76d7a3baa6b0fbc40b0116348
diff --git a/include/services/rmmd_svc.h b/include/services/rmmd_svc.h
index 8eb49c8..9b4c39f 100644
--- a/include/services/rmmd_svc.h
+++ b/include/services/rmmd_svc.h
@@ -77,6 +77,26 @@
#define RMMD_ERR_INVAL -5
#define RMMD_ERR_UNK -6
+/*
+ * Retrieve Platform token from EL3.
+ * The arguments to this SMC are :
+ * arg0 - Function ID.
+ * arg1 - Platform attestation token buffer Physical address. (The challenge
+ * object is passed in this buffer.)
+ * arg2 - Platform attestation token buffer size (in bytes).
+ * arg3 - Challenge object size (in bytes). It has be one of the defined SHA hash
+ * sizes.
+ * The return arguments are :
+ * ret0 - Status / error.
+ * ret1 - Size of the platform token if successful.
+ */
+#define RMMD_ATTEST_GET_PLAT_TOKEN RMM_FID(SMC_64, ATTEST_GET_PLAT_TOKEN)
+
+/* Acceptable SHA sizes for Challenge object */
+#define SHA256_DIGEST_SIZE 32U
+#define SHA384_DIGEST_SIZE 48U
+#define SHA512_DIGEST_SIZE 64U
+
#ifndef __ASSEMBLER__
#include <stdint.h>