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Raef Coles734aaac2022-06-15 14:37:22 +01001/*
2 * Copyright (c) 2022, Arm Limited. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 */
7
8#ifndef __RSS_COMMS_PROTOCOL_EMBED_H__
9#define __RSS_COMMS_PROTOCOL_EMBED_H__
10
11#include <cdefs.h>
12
13#include <initial_attestation.h>
14#include <psa/client.h>
15
16#include <platform_def.h>
17
18/*
19 * In the current implementation the RoT Service request that requires the
20 * biggest message buffer is the RSS_ATTEST_GET_TOKEN. The maximum required
21 * buffer size is calculated based on the platform-specific needs of
22 * this request.
23 */
24#ifndef RSS_COMMS_PAYLOAD_MAX_SIZE
25#define RSS_COMMS_PAYLOAD_MAX_SIZE (PSA_INITIAL_ATTEST_CHALLENGE_SIZE_64 \
26 + PLAT_ATTEST_TOKEN_MAX_SIZE)
27#endif
28
29struct __packed rss_embed_msg_t {
30 psa_handle_t handle;
31 uint32_t ctrl_param; /* type, in_len, out_len */
32 uint16_t io_size[PSA_MAX_IOVEC];
33 uint8_t trailer[RSS_COMMS_PAYLOAD_MAX_SIZE];
34};
35
36struct __packed rss_embed_reply_t {
37 int32_t return_val;
38 uint16_t out_size[PSA_MAX_IOVEC];
39 uint8_t trailer[RSS_COMMS_PAYLOAD_MAX_SIZE];
40};
41
42psa_status_t rss_protocol_embed_serialize_msg(psa_handle_t handle,
43 int16_t type,
44 const psa_invec *in_vec,
45 uint8_t in_len,
46 const psa_outvec *out_vec,
47 uint8_t out_len,
48 struct rss_embed_msg_t *msg,
49 size_t *msg_len);
50
51psa_status_t rss_protocol_embed_deserialize_reply(psa_outvec *out_vec,
52 uint8_t out_len,
53 psa_status_t *return_val,
54 const struct rss_embed_reply_t *reply,
55 size_t reply_size);
56
57#endif /* __RSS_COMMS_PROTOCOL_EMBED_H__ */