Interface: Split the source files for different models

This patch splits the interface source files for different
models.
They only contain the implementations for each model
respectively.

Change-Id: I70aef5384754c445787327ec2c61fc57201da86f
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/interface/src/tfm_initial_attestation_func_api.c b/interface/src/tfm_initial_attestation_func_api.c
new file mode 100644
index 0000000..c391f61
--- /dev/null
+++ b/interface/src/tfm_initial_attestation_func_api.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include "psa/initial_attestation.h"
+#include "tfm_veneers.h"
+#include "tfm_ns_interface.h"
+#include "psa/client.h"
+
+#define IOVEC_LEN(x) (sizeof(x)/sizeof(x[0]))
+
+enum psa_attest_err_t
+psa_initial_attest_get_token(const uint8_t *challenge_obj,
+                             uint32_t       challenge_size,
+                             uint8_t       *token,
+                             uint32_t      *token_size)
+{
+
+    int32_t res;
+
+    psa_invec in_vec[] = {
+        {challenge_obj, challenge_size}
+    };
+    psa_outvec out_vec[] = {
+        {token, *token_size}
+    };
+
+    res = tfm_ns_interface_dispatch(
+                               (veneer_fn)tfm_initial_attest_get_token_veneer,
+                               (uint32_t)in_vec,  IOVEC_LEN(in_vec),
+                               (uint32_t)out_vec, IOVEC_LEN(out_vec));
+
+    if (res == (int32_t)PSA_ATTEST_ERR_SUCCESS) {
+        *token_size = out_vec[0].len;
+    }
+
+    return (enum psa_attest_err_t)res;
+}
+
+enum psa_attest_err_t
+psa_initial_attest_get_token_size(uint32_t  challenge_size,
+                                  uint32_t *token_size)
+{
+    psa_invec in_vec[] = {
+        {&challenge_size, sizeof(challenge_size)}
+    };
+    psa_outvec out_vec[] = {
+        {token_size, sizeof(uint32_t)}
+    };
+
+    return (enum psa_attest_err_t)tfm_ns_interface_dispatch(
+                            (veneer_fn)tfm_initial_attest_get_token_size_veneer,
+                            (uint32_t)in_vec,  IOVEC_LEN(in_vec),
+                            (uint32_t)out_vec, IOVEC_LEN(out_vec));
+}