1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2014, STMicroelectronics International N.V. 4 */ 5 6 #include <kernel/panic.h> 7 #include <kernel/tee_time.h> 8 #include <string.h> 9 #include <stdlib.h> 10 #include <utee_defines.h> 11 12 struct tee_ta_time_offs { 13 TEE_UUID uuid; 14 TEE_Time offs; 15 bool positive; 16 }; 17 18 static struct tee_ta_time_offs *tee_time_offs; 19 static size_t tee_time_num_offs; 20 21 static TEE_Result tee_time_ta_get_offs(const TEE_UUID *uuid, 22 const TEE_Time **offs, bool *positive) 23 { 24 size_t n; 25 26 for (n = 0; n < tee_time_num_offs; n++) { 27 if (memcmp(uuid, &tee_time_offs[n].uuid, sizeof(TEE_UUID)) 28 == 0) { 29 *offs = &tee_time_offs[n].offs; 30 *positive = tee_time_offs[n].positive; 31 return TEE_SUCCESS; 32 } 33 } 34 return TEE_ERROR_TIME_NOT_SET; 35 } 36 37 static TEE_Result tee_time_ta_set_offs(const TEE_UUID *uuid, 38 const TEE_Time *offs, bool positive) 39 { 40 size_t n; 41 struct tee_ta_time_offs *o; 42 43 for (n = 0; n < tee_time_num_offs; n++) { 44 if (memcmp(uuid, &tee_time_offs[n].uuid, sizeof(TEE_UUID)) 45 == 0) { 46 tee_time_offs[n].offs = *offs; 47 tee_time_offs[n].positive = positive; 48 return TEE_SUCCESS; 49 } 50 } 51 52 n = tee_time_num_offs + 1; 53 o = realloc(tee_time_offs, n * sizeof(struct tee_ta_time_offs)); 54 if (!o) 55 return TEE_ERROR_OUT_OF_MEMORY; 56 tee_time_offs = o; 57 tee_time_offs[tee_time_num_offs].uuid = *uuid; 58 tee_time_offs[tee_time_num_offs].offs = *offs; 59 tee_time_offs[tee_time_num_offs].positive = positive; 60 tee_time_num_offs = n; 61 return TEE_SUCCESS; 62 } 63 64 TEE_Result tee_time_get_ta_time(const TEE_UUID *uuid, TEE_Time *time) 65 { 66 TEE_Result res; 67 const TEE_Time *offs; 68 bool positive; 69 TEE_Time t; 70 TEE_Time t2; 71 72 res = tee_time_ta_get_offs(uuid, &offs, &positive); 73 if (res != TEE_SUCCESS) 74 return res; 75 76 res = tee_time_get_sys_time(&t); 77 if (res != TEE_SUCCESS) 78 return res; 79 80 if (positive) { 81 TEE_TIME_ADD(t, *offs, t2); 82 83 /* Detect wrapping, the wrapped time should be returned. */ 84 if (TEE_TIME_LT(t2, t)) 85 res = TEE_ERROR_OVERFLOW; 86 } else { 87 TEE_TIME_SUB(t, *offs, t2); 88 89 /* Detect wrapping, the wrapped time should be returned. */ 90 if (TEE_TIME_LE(t, t2)) 91 res = TEE_ERROR_OVERFLOW; 92 } 93 *time = t2; 94 95 return res; 96 } 97 98 TEE_Result tee_time_set_ta_time(const TEE_UUID *uuid, const TEE_Time *time) 99 { 100 TEE_Result res; 101 TEE_Time offs; 102 TEE_Time t; 103 104 /* Check that time is normalized. */ 105 if (time->millis >= TEE_TIME_MILLIS_BASE) 106 return TEE_ERROR_BAD_PARAMETERS; 107 108 res = tee_time_get_sys_time(&t); 109 if (res != TEE_SUCCESS) 110 return res; 111 112 if (TEE_TIME_LT(t, *time)) { 113 TEE_TIME_SUB(*time, t, offs); 114 return tee_time_ta_set_offs(uuid, &offs, true); 115 } else { 116 TEE_TIME_SUB(t, *time, offs); 117 return tee_time_ta_set_offs(uuid, &offs, false); 118 } 119 } 120 121 void tee_time_busy_wait(uint32_t milliseconds_delay) 122 { 123 TEE_Time curr; 124 TEE_Time delta; 125 TEE_Time end; 126 127 if (tee_time_get_sys_time(&curr) != TEE_SUCCESS) 128 panic(); 129 delta.seconds = milliseconds_delay / 1000; 130 delta.millis = milliseconds_delay % 1000; 131 TEE_TIME_ADD(curr, delta, end); 132 133 while (TEE_TIME_LT(curr, end)) 134 if (tee_time_get_sys_time(&curr) != TEE_SUCCESS) 135 panic(); 136 } 137