1 /*
2 * Copyright (c) 2016, Linaro Limited
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <tee_internal_api.h>
29 #include <tee_internal_api_extensions.h>
30
31 #include <hello_world_ta.h>
32
33 /*
34 * Called when the instance of the TA is created. This is the first call in
35 * the TA.
36 */
TA_CreateEntryPoint(void)37 TEE_Result TA_CreateEntryPoint(void)
38 {
39 DMSG("has been called");
40
41 return TEE_SUCCESS;
42 }
43
44 /*
45 * Called when the instance of the TA is destroyed if the TA has not
46 * crashed or panicked. This is the last call in the TA.
47 */
TA_DestroyEntryPoint(void)48 void TA_DestroyEntryPoint(void)
49 {
50 DMSG("has been called");
51 }
52
53 /*
54 * Called when a new session is opened to the TA. *sess_ctx can be updated
55 * with a value to be able to identify this session in subsequent calls to the
56 * TA. In this function you will normally do the global initialization for the
57 * TA.
58 */
TA_OpenSessionEntryPoint(uint32_t param_types,TEE_Param __maybe_unused params[4],void __maybe_unused ** sess_ctx)59 TEE_Result TA_OpenSessionEntryPoint(uint32_t param_types,
60 TEE_Param __maybe_unused params[4],
61 void __maybe_unused **sess_ctx)
62 {
63 uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_NONE,
64 TEE_PARAM_TYPE_NONE,
65 TEE_PARAM_TYPE_NONE,
66 TEE_PARAM_TYPE_NONE);
67
68 DMSG("has been called");
69
70 if (param_types != exp_param_types)
71 return TEE_ERROR_BAD_PARAMETERS;
72
73 /* Unused parameters */
74 (void)¶ms;
75 (void)&sess_ctx;
76
77 /*
78 * The DMSG() macro is non-standard, TEE Internal API doesn't
79 * specify any means to logging from a TA.
80 */
81 IMSG("Hello World!\n");
82
83 /* If return value != TEE_SUCCESS the session will not be created. */
84 return TEE_SUCCESS;
85 }
86
87 /*
88 * Called when a session is closed, sess_ctx hold the value that was
89 * assigned by TA_OpenSessionEntryPoint().
90 */
TA_CloseSessionEntryPoint(void __maybe_unused * sess_ctx)91 void TA_CloseSessionEntryPoint(void __maybe_unused *sess_ctx)
92 {
93 (void)&sess_ctx; /* Unused parameter */
94 IMSG("Goodbye!\n");
95 }
96
inc_value(uint32_t param_types,TEE_Param params[4])97 static TEE_Result inc_value(uint32_t param_types,
98 TEE_Param params[4])
99 {
100 uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_INOUT,
101 TEE_PARAM_TYPE_NONE,
102 TEE_PARAM_TYPE_NONE,
103 TEE_PARAM_TYPE_NONE);
104
105 DMSG("has been called");
106
107 if (param_types != exp_param_types)
108 return TEE_ERROR_BAD_PARAMETERS;
109
110 IMSG("Got value: %u from NW", params[0].value.a);
111 params[0].value.a++;
112 IMSG("Increase value to: %u", params[0].value.a);
113
114 return TEE_SUCCESS;
115 }
116
dec_value(uint32_t param_types,TEE_Param params[4])117 static TEE_Result dec_value(uint32_t param_types,
118 TEE_Param params[4])
119 {
120 uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_INOUT,
121 TEE_PARAM_TYPE_NONE,
122 TEE_PARAM_TYPE_NONE,
123 TEE_PARAM_TYPE_NONE);
124
125 DMSG("has been called");
126
127 if (param_types != exp_param_types)
128 return TEE_ERROR_BAD_PARAMETERS;
129
130 IMSG("Got value: %u from NW", params[0].value.a);
131 params[0].value.a--;
132 IMSG("Decrease value to: %u", params[0].value.a);
133
134 return TEE_SUCCESS;
135 }
136 /*
137 * Called when a TA is invoked. sess_ctx hold that value that was
138 * assigned by TA_OpenSessionEntryPoint(). The rest of the paramters
139 * comes from normal world.
140 */
TA_InvokeCommandEntryPoint(void __maybe_unused * sess_ctx,uint32_t cmd_id,uint32_t param_types,TEE_Param params[4])141 TEE_Result TA_InvokeCommandEntryPoint(void __maybe_unused *sess_ctx,
142 uint32_t cmd_id,
143 uint32_t param_types, TEE_Param params[4])
144 {
145 (void)&sess_ctx; /* Unused parameter */
146
147 switch (cmd_id) {
148 case TA_HELLO_WORLD_CMD_INC_VALUE:
149 return inc_value(param_types, params);
150 case TA_HELLO_WORLD_CMD_DEC_VALUE:
151 return dec_value(param_types, params);
152 default:
153 return TEE_ERROR_BAD_PARAMETERS;
154 }
155 }
156