1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (C) 2019, Linaro Limited 4 */ 5 6 /* 7 * This pseudo TA is used by normal world OS TEE driver to fetch pseudo TA's 8 * UUIDs which can act as TEE bus devices. 9 */ 10 11 #include <config.h> 12 #include <kernel/early_ta.h> 13 #include <kernel/linker.h> 14 #include <kernel/pseudo_ta.h> 15 #include <kernel/stmm_sp.h> 16 #include <kernel/tee_ta_manager.h> 17 #include <pta_device.h> 18 #include <string.h> 19 #include <tee/uuid.h> 20 #include <user_ta_header.h> 21 22 #define PTA_NAME "device.pta" 23 24 static void add_ta(uint32_t flags, const TEE_UUID *uuid, uint8_t *buf, 25 uint32_t blen, uint32_t *pos, uint32_t rflags) 26 { 27 if ((flags & TA_FLAG_DEVICE_ENUM) && 28 (flags & TA_FLAG_DEVICE_ENUM_SUPP)) { 29 EMSG(PTA_NAME ": skipping TA %pUl, inconsistent flags", uuid); 30 return; 31 } 32 33 if (flags & rflags) { 34 if (*pos + sizeof(*uuid) <= blen) 35 tee_uuid_to_octets(buf + *pos, uuid); 36 37 *pos += sizeof(*uuid); 38 } 39 } 40 41 static TEE_Result get_devices(uint32_t types, 42 TEE_Param params[TEE_NUM_PARAMS], 43 uint32_t rflags) 44 { 45 const struct pseudo_ta_head *ta = NULL; 46 const struct embedded_ts *eta = NULL; 47 void *buf = NULL; 48 uint32_t blen = 0; 49 uint32_t pos = 0; 50 51 if (types != TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_OUTPUT, 52 TEE_PARAM_TYPE_NONE, 53 TEE_PARAM_TYPE_NONE, 54 TEE_PARAM_TYPE_NONE)) 55 return TEE_ERROR_BAD_PARAMETERS; 56 57 if (!params[0].memref.buffer && (params[0].memref.size > 0)) 58 return TEE_ERROR_BAD_PARAMETERS; 59 60 buf = params[0].memref.buffer; 61 blen = params[0].memref.size; 62 63 SCATTERED_ARRAY_FOREACH(ta, pseudo_tas, struct pseudo_ta_head) 64 add_ta(ta->flags, &ta->uuid, buf, blen, &pos, rflags); 65 66 if (stmm_get_uuid()) 67 add_ta(TA_FLAG_DEVICE_ENUM_SUPP, stmm_get_uuid(), buf, blen, 68 &pos, rflags); 69 70 if (IS_ENABLED(CFG_EARLY_TA)) 71 for_each_early_ta(eta) 72 add_ta(eta->flags, &eta->uuid, buf, blen, &pos, 73 rflags); 74 75 params[0].memref.size = pos; 76 if (pos > blen) 77 return TEE_ERROR_SHORT_BUFFER; 78 79 return TEE_SUCCESS; 80 } 81 82 static TEE_Result invoke_command(void *pSessionContext __unused, 83 uint32_t nCommandID, uint32_t nParamTypes, 84 TEE_Param pParams[TEE_NUM_PARAMS]) 85 { 86 switch (nCommandID) { 87 case PTA_CMD_GET_DEVICES: 88 return get_devices(nParamTypes, pParams, 89 TA_FLAG_DEVICE_ENUM); 90 case PTA_CMD_GET_DEVICES_SUPP: 91 return get_devices(nParamTypes, pParams, 92 TA_FLAG_DEVICE_ENUM_SUPP); 93 default: 94 break; 95 } 96 97 return TEE_ERROR_NOT_IMPLEMENTED; 98 } 99 100 pseudo_ta_register(.uuid = PTA_DEVICE_UUID, .name = PTA_NAME, 101 .flags = PTA_DEFAULT_FLAGS, 102 .invoke_command_entry_point = invoke_command); 103