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OP-TEE: REE filesystem TA

2024-11-26

| 2025-1-12

本文字數 116閱讀時長≈ 1 分鐘

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The code is based on: https://gitlab.com/riseproject/riscv-optee/optee_os/-/tree/dev-optee-mpxy Commit ID: 75df9ba41a404aec897399ead0ff0aebcbff48ca

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Reference:

Trusted Applications — OP-TEE documentation documentation

There are two ways to implement Trusted Applications (TAs), Pseudo TAs and user mode TAs. User mode TAs are full featured Trusted Applications as specified by the GlobalPlatform API TEE specifications, these are simply the ones people are referring to when they are saying “Trusted Applications” and in most cases this is the preferred type of TA to write and use.

Trusted Applications — OP-TEE documentation documentation

https://optee.readthedocs.io/en/latest/architecture/trusted_applications.html#loading-ree-fs-ta

ree_fs_ta_open()

Call rpc_load() to request TA from tee-supplicant.
Validate the loaded TA.

rpc_load()

Call thread_rpc_cmd() with OPTEE_RPC_CMD_LOAD_TA RPC command without struct thread_param_memref parameter to request the size of TA.

OPTEE_RPC_CMD_LOAD_TA RPC command is saved to struct optee_msg_arg.cmd.
struct optee_msg_arg is stored in the shared memory shared with the untrusted domain.

Call thread_rpc_alloc_payload() to allocate data for TA.

Call thread_rpc_alloc() to allocate shared memory for TA.

Call thread_rpc() with rpc_args (rv[THREAD_RPC_NUM_ARGS]). rpc_args’s first element is set to OPTEE_ABI_RETURN_RPC_CMD function. The RPC command is set to OPTEE_RPC_CMD_SHM_ALLOC to allocate the shared memory for TA.

Call thread_rpc_cmd() with OPTEE_RPC_CMD_LOAD_TA RPC command again with struct thread_param_memref parameter to load TA.

標籤:

OP-TEE

OP-TEE: ldelf OP-TEE: User TAs

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