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 <tee/uuid.h> 19 #include <user_ta_header.h> 20 21 #define PTA_NAME "device.pta" 22 23 static void add_ta(uint32_t flags, const TEE_UUID *uuid, uint8_t *buf, 24 uint32_t blen, uint32_t *pos, uint32_t rflags) 25 { 26 if ((flags & TA_FLAG_DEVICE_ENUM) && 27 (flags & TA_FLAG_DEVICE_ENUM_SUPP)) { 28 EMSG(PTA_NAME ": skipping TA %pUl, inconsistent flags", uuid); 29 return; 30 } 31 32 if (flags & rflags) { 33 if (*pos + sizeof(*uuid) <= blen) 34 tee_uuid_to_octets(buf + *pos, uuid); 35 36 *pos += sizeof(*uuid); 37 } 38 } 39 40 static TEE_Result get_devices(uint32_t types, 41 TEE_Param params[TEE_NUM_PARAMS], 42 uint32_t rflags) 43 { 44 const struct pseudo_ta_head *ta = NULL; 45 const struct embedded_ts *eta = NULL; 46 void *buf = NULL; 47 uint32_t blen = 0; 48 uint32_t pos = 0; 49 50 if (types != TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_OUTPUT, 51 TEE_PARAM_TYPE_NONE, 52 TEE_PARAM_TYPE_NONE, 53 TEE_PARAM_TYPE_NONE)) 54 return TEE_ERROR_BAD_PARAMETERS; 55 56 if (!params[0].memref.buffer && (params[0].memref.size > 0)) 57 return TEE_ERROR_BAD_PARAMETERS; 58 59 buf = params[0].memref.buffer; 60 blen = params[0].memref.size; 61 62 SCATTERED_ARRAY_FOREACH(ta, pseudo_tas, struct pseudo_ta_head) 63 add_ta(ta->flags, &ta->uuid, buf, blen, &pos, rflags); 64 65 if (stmm_get_uuid()) 66 add_ta(TA_FLAG_DEVICE_ENUM_SUPP, stmm_get_uuid(), buf, blen, 67 &pos, rflags); 68 69 if (IS_ENABLED(CFG_EARLY_TA)) 70 for_each_early_ta(eta) 71 add_ta(eta->flags, &eta->uuid, buf, blen, &pos, 72 rflags); 73 74 params[0].memref.size = pos; 75 if (pos > blen) 76 return TEE_ERROR_SHORT_BUFFER; 77 78 return TEE_SUCCESS; 79 } 80 81 static TEE_Result invoke_command(void *pSessionContext __unused, 82 uint32_t nCommandID, uint32_t nParamTypes, 83 TEE_Param pParams[TEE_NUM_PARAMS]) 84 { 85 switch (nCommandID) { 86 case PTA_CMD_GET_DEVICES: 87 return get_devices(nParamTypes, pParams, 88 TA_FLAG_DEVICE_ENUM); 89 case PTA_CMD_GET_DEVICES_SUPP: 90 return get_devices(nParamTypes, pParams, 91 TA_FLAG_DEVICE_ENUM_SUPP); 92 default: 93 break; 94 } 95 96 return TEE_ERROR_NOT_IMPLEMENTED; 97 } 98 99 pseudo_ta_register(.uuid = PTA_DEVICE_UUID, .name = PTA_NAME, 100 .flags = PTA_DEFAULT_FLAGS, 101 .invoke_command_entry_point = invoke_command); 102