diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index 509fd58..9deb33d 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -303,6 +303,11 @@
 			unsigned int ncpu);
 
 /*******************************************************************************
+ * Mandatory BL31 functions when ENABLE_RME=1
+ ******************************************************************************/
+int plat_get_cca_attest_token(uintptr_t buf, size_t *len,
+			       uintptr_t hash, size_t hash_size);
+/*******************************************************************************
  * Optional BL31 functions (may be overridden)
  ******************************************************************************/
 void bl31_plat_enable_mmu(uint32_t flags);
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>