1 /*
2 * Copyright (c) 2019-2022, Arm Limited. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 */
7
8 #include "config_ps.h"
9 #include "tfm_protected_storage.h"
10 #include "ps_object_system.h"
11 #include "tfm_ps_defs.h"
12
tfm_ps_init(void)13 psa_status_t tfm_ps_init(void)
14 {
15 psa_status_t err;
16
17 err = ps_system_prepare();
18 #if PS_CREATE_FLASH_LAYOUT
19 /* If PS_CREATE_FLASH_LAYOUT is set to 1, it indicates that it is required to
20 * create a PS flash layout. PS service will generate an empty and valid
21 * PS flash layout to store assets. It will erase all data located in the
22 * assigned PS memory area before generating the PS layout.
23 * This flag is required to be set if the PS memory area is located in
24 * non-persistent memory.
25 * This flag can be set if the PS memory area is located in persistent
26 * memory without a previous valid PS flash layout in it. That is the case
27 * when it is the first time in the device life that the PS service is
28 * executed.
29 */
30 if (err != PSA_SUCCESS) {
31 /* Remove all data in the PS memory area and create a valid PS flash
32 * layout in that area.
33 */
34 err = ps_system_wipe_all();
35 if (err != PSA_SUCCESS) {
36 return err;
37 }
38
39 /* Attempt to initialise again */
40 err = ps_system_prepare();
41 }
42 #endif /* PS_CREATE_FLASH_LAYOUT */
43
44 return err;
45 }
46
tfm_ps_set(int32_t client_id,psa_storage_uid_t uid,uint32_t data_length,psa_storage_create_flags_t create_flags)47 psa_status_t tfm_ps_set(int32_t client_id,
48 psa_storage_uid_t uid,
49 uint32_t data_length,
50 psa_storage_create_flags_t create_flags)
51 {
52 /* Check that the UID is valid */
53 if (uid == TFM_PS_INVALID_UID) {
54 return PSA_ERROR_INVALID_ARGUMENT;
55 }
56
57 /* Check that the create_flags does not contain any unsupported flags */
58 if (create_flags & ~(PSA_STORAGE_FLAG_WRITE_ONCE |
59 PSA_STORAGE_FLAG_NO_CONFIDENTIALITY |
60 PSA_STORAGE_FLAG_NO_REPLAY_PROTECTION)) {
61 return PSA_ERROR_NOT_SUPPORTED;
62 }
63
64 /* Create the object in the object system */
65 return ps_object_create(uid, client_id, create_flags, data_length);
66 }
67
tfm_ps_get(int32_t client_id,psa_storage_uid_t uid,uint32_t data_offset,uint32_t data_size,size_t * p_data_length)68 psa_status_t tfm_ps_get(int32_t client_id,
69 psa_storage_uid_t uid,
70 uint32_t data_offset,
71 uint32_t data_size,
72 size_t *p_data_length)
73 {
74 /* Check that the UID is valid */
75 if (uid == TFM_PS_INVALID_UID) {
76 return PSA_ERROR_INVALID_ARGUMENT;
77 }
78
79 /* Read the object data from the object system */
80 return ps_object_read(uid, client_id, data_offset, data_size,
81 p_data_length);
82 }
83
tfm_ps_get_info(int32_t client_id,psa_storage_uid_t uid,struct psa_storage_info_t * p_info)84 psa_status_t tfm_ps_get_info(int32_t client_id, psa_storage_uid_t uid,
85 struct psa_storage_info_t *p_info)
86 {
87 /* Check that the UID is valid */
88 if (uid == TFM_PS_INVALID_UID) {
89 return PSA_ERROR_INVALID_ARGUMENT;
90 }
91
92 /* Get the info struct data from the object system */
93 return ps_object_get_info(uid, client_id, p_info);
94 }
95
tfm_ps_remove(int32_t client_id,psa_storage_uid_t uid)96 psa_status_t tfm_ps_remove(int32_t client_id, psa_storage_uid_t uid)
97 {
98 psa_status_t err;
99
100 /* Check that the UID is valid */
101 if (uid == TFM_PS_INVALID_UID) {
102 return PSA_ERROR_INVALID_ARGUMENT;
103 }
104
105 /* Delete the object from the object system */
106 err = ps_object_delete(uid, client_id);
107
108 /* PSA_ERROR_INVALID_SIGNATURE is not supported by psa_ps_remove
109 * specification. So, this function returns TFM_PS_ERR_OPERATION_FAILED
110 * instead.
111 */
112 if (err == PSA_ERROR_INVALID_SIGNATURE) {
113 return PSA_ERROR_GENERIC_ERROR;
114 }
115
116 return err;
117 }
118
tfm_ps_get_support(void)119 uint32_t tfm_ps_get_support(void)
120 {
121 /*
122 * This function returns a bitmask with flags set for all of the optional
123 * features supported by the PS service implementation.
124 *
125 * PS service does not support the optional extended PSA PS API yet.
126 */
127
128 return 0;
129 }
130
