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 <trace.h> 11 #include <utee_defines.h> 12 13 struct tee_ta_time_offs { 14 TEE_UUID uuid; 15 TEE_Time offs; 16 bool positive; 17 }; 18 19 static struct tee_ta_time_offs *tee_time_offs; 20 static size_t tee_time_num_offs; 21 22 static TEE_Result tee_time_ta_get_offs(const TEE_UUID *uuid, 23 const TEE_Time **offs, bool *positive) 24 { 25 size_t n; 26 27 for (n = 0; n < tee_time_num_offs; n++) { 28 if (memcmp(uuid, &tee_time_offs[n].uuid, sizeof(TEE_UUID)) 29 == 0) { 30 *offs = &tee_time_offs[n].offs; 31 *positive = tee_time_offs[n].positive; 32 return TEE_SUCCESS; 33 } 34 } 35 return TEE_ERROR_TIME_NOT_SET; 36 } 37 38 static TEE_Result tee_time_ta_set_offs(const TEE_UUID *uuid, 39 const TEE_Time *offs, bool positive) 40 { 41 size_t n; 42 struct tee_ta_time_offs *o; 43 44 for (n = 0; n < tee_time_num_offs; n++) { 45 if (memcmp(uuid, &tee_time_offs[n].uuid, sizeof(TEE_UUID)) 46 == 0) { 47 tee_time_offs[n].offs = *offs; 48 tee_time_offs[n].positive = positive; 49 return TEE_SUCCESS; 50 } 51 } 52 53 n = tee_time_num_offs + 1; 54 o = realloc(tee_time_offs, n * sizeof(struct tee_ta_time_offs)); 55 if (!o) 56 return TEE_ERROR_OUT_OF_MEMORY; 57 tee_time_offs = o; 58 tee_time_offs[tee_time_num_offs].uuid = *uuid; 59 tee_time_offs[tee_time_num_offs].offs = *offs; 60 tee_time_offs[tee_time_num_offs].positive = positive; 61 tee_time_num_offs = n; 62 return TEE_SUCCESS; 63 } 64 65 TEE_Result tee_time_get_ta_time(const TEE_UUID *uuid, TEE_Time *time) 66 { 67 TEE_Result res; 68 const TEE_Time *offs; 69 bool positive; 70 TEE_Time t; 71 TEE_Time t2; 72 73 res = tee_time_ta_get_offs(uuid, &offs, &positive); 74 if (res != TEE_SUCCESS) 75 return res; 76 77 res = tee_time_get_sys_time(&t); 78 if (res != TEE_SUCCESS) 79 return res; 80 81 if (positive) { 82 TEE_TIME_ADD(t, *offs, t2); 83 84 /* Detect wrapping, the wrapped time should be returned. */ 85 if (TEE_TIME_LT(t2, t)) 86 res = TEE_ERROR_OVERFLOW; 87 } else { 88 TEE_TIME_SUB(t, *offs, t2); 89 90 /* Detect wrapping, the wrapped time should be returned. */ 91 if (TEE_TIME_LE(t, t2)) 92 res = TEE_ERROR_OVERFLOW; 93 } 94 *time = t2; 95 96 return res; 97 } 98 99 TEE_Result tee_time_set_ta_time(const TEE_UUID *uuid, const TEE_Time *time) 100 { 101 TEE_Result res; 102 TEE_Time offs; 103 TEE_Time t; 104 105 /* Check that time is normalized. */ 106 if (time->millis >= TEE_TIME_MILLIS_BASE) 107 return TEE_ERROR_BAD_PARAMETERS; 108 109 res = tee_time_get_sys_time(&t); 110 if (res != TEE_SUCCESS) 111 return res; 112 113 if (TEE_TIME_LT(t, *time)) { 114 TEE_TIME_SUB(*time, t, offs); 115 return tee_time_ta_set_offs(uuid, &offs, true); 116 } else { 117 TEE_TIME_SUB(t, *time, offs); 118 return tee_time_ta_set_offs(uuid, &offs, false); 119 } 120 } 121 122 void tee_time_busy_wait(uint32_t milliseconds_delay) 123 { 124 TEE_Time curr; 125 TEE_Time delta; 126 TEE_Time end; 127 128 if (tee_time_get_sys_time(&curr) != TEE_SUCCESS) 129 panic(); 130 delta.seconds = milliseconds_delay / 1000; 131 delta.millis = milliseconds_delay % 1000; 132 TEE_TIME_ADD(curr, delta, end); 133 134 while (TEE_TIME_LT(curr, end)) 135 if (tee_time_get_sys_time(&curr) != TEE_SUCCESS) 136 panic(); 137 } 138