diff --git a/services/std_svc/spm/el3_spmc/spmc_shared_mem.h b/services/std_svc/spm/el3_spmc/spmc_shared_mem.h
new file mode 100644
index 0000000..8571e94
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_shared_mem.h
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPMC_SHARED_MEM_H
+#define SPMC_SHARED_MEM_H
+
+#include <services/el3_spmc_ffa_memory.h>
+
+/**
+ * struct ffa_mem_relinquish_descriptor - Relinquish request descriptor.
+ * @handle:
+ *         Id of shared memory object to relinquish.
+ * @flags:
+ *         If bit 0 is set clear memory after unmapping from borrower. Must be 0
+ *         for share. Bit[1]: Time slicing. Not supported, must be 0. All other
+ *         bits are reserved 0.
+ * @endpoint_count:
+ *         Number of entries in @endpoint_array.
+ * @endpoint_array:
+ *         Array of endpoint ids.
+ */
+struct ffa_mem_relinquish_descriptor {
+	uint64_t handle;
+	uint32_t flags;
+	uint32_t endpoint_count;
+	ffa_endpoint_id16_t endpoint_array[];
+};
+CASSERT(sizeof(struct ffa_mem_relinquish_descriptor) == 16,
+	assert_ffa_mem_relinquish_descriptor_size_mismatch);
+
+/**
+ * struct spmc_shmem_obj_state - Global state.
+ * @data:           Backing store for spmc_shmem_obj objects.
+ * @data_size:      The size allocated for the backing store.
+ * @allocated:      Number of bytes allocated in @data.
+ * @next_handle:    Handle used for next allocated object.
+ * @lock:           Lock protecting all state in this file.
+ */
+struct spmc_shmem_obj_state {
+	uint8_t *data;
+	size_t data_size;
+	size_t allocated;
+	uint64_t next_handle;
+	spinlock_t lock;
+};
+
+extern struct spmc_shmem_obj_state spmc_shmem_obj_state;
+
+long spmc_ffa_mem_send(uint32_t smc_fid,
+		       bool secure_origin,
+		       uint64_t total_length,
+		       uint32_t fragment_length,
+		       uint64_t address,
+		       uint32_t page_count,
+		       void *cookie,
+		       void *handle,
+		       uint64_t flags);
+
+long spmc_ffa_mem_frag_tx(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint64_t handle_low,
+			  uint64_t handle_high,
+			  uint32_t fragment_length,
+			  uint32_t sender_id,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags);
+
+long spmc_ffa_mem_retrieve_req(uint32_t smc_fid,
+			       bool secure_origin,
+			       uint32_t total_length,
+			       uint32_t fragment_length,
+			       uint64_t address,
+			       uint32_t page_count,
+			       void *cookie,
+			       void *handle,
+			       uint64_t flags);
+
+long spmc_ffa_mem_frag_rx(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint32_t handle_low,
+			  uint32_t handle_high,
+			  uint32_t fragment_offset,
+			  uint32_t sender_id,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags);
+
+
+int spmc_ffa_mem_relinquish(uint32_t smc_fid,
+			    bool secure_origin,
+			    uint32_t handle_low,
+			    uint32_t handle_high,
+			    uint32_t fragment_offset,
+			    uint32_t sender_id,
+			    void *cookie,
+			    void *handle,
+			    uint64_t flags);
+
+int spmc_ffa_mem_reclaim(uint32_t smc_fid,
+			 bool secure_origin,
+			 uint32_t handle_low,
+			 uint32_t handle_high,
+			 uint32_t mem_flags,
+			 uint64_t x4,
+			 void *cookie,
+			 void *handle,
+			 uint64_t flags);
+
+#endif /* SPMC_SHARED_MEM_H */