1 .. SPDX-License-Identifier: GPL-2.0
2
3 =================================
4 TS-TEE (Trusted Services project)
5 =================================
6
7 This driver provides access to secure services
8
9 Trusted Services [1] is a TrustedFirmware.org
10 for developing and deploying device Root of Tr
11 Secure Partitions. The project hosts the refer
12 Platform Security Architecture [3] for Arm A-p
13
14 The FF-A Secure Partitions (SP) are accessible
15 provides the low level communication for this
16 Services RPC protocol is used [5]. To use the
17 implementation is provided at [6], which is pa
18 library called libts [7].
19
20 All Trusted Services (TS) SPs have the same FF
21 protocol. A TS SP can host one or more service
22 A service is identified by its service UUID; t
23 present twice in the same SP. During SP boot e
24 an "interface ID". This is just a short ID to
25
26 The generic TEE design is to share memory at o
27 then be reused to communicate with multiple ap
28 OS. However, in case of FF-A, memory sharing w
29 memory is shared with a specific SP. User spac
30 share memory with each SP based on its endpoin
31 device is registered for each discovered TS SP
32 opening the TEE device and creating a TEE cont
33 services. Opening a service corresponds to ope
34 tee_context.
35
36 Overview of a system with Trusted Services com
37
38 User space Kernel space
39 ~~~~~~~~~~ ~~~~~~~~~~~~
40 +--------+
41 | Client |
42 +--------+
43 /\
44 ||
45 ||
46 ||
47 \/
48 +-------+ +----------+------
49 | libts | | TEE | TS-TE
50 | | | subsys | drive
51 +-------+----------------+----+-----+------
52 | Generic TEE API | | FF-A
53 | IOCTL (TEE_IOC_*) | | drive
54 +-----------------------------+ +------
55
56 References
57 ==========
58
59 [1] https://www.trustedfirmware.org/projects/t
60
61 [2] https://developer.arm.com/documentation/de
62
63 [3] https://www.arm.com/architecture/security-
64
65 [4] drivers/firmware/arm_ffa/
66
67 [5] https://trusted-services.readthedocs.io/en
68
69 [6] https://git.trustedfirmware.org/TS/trusted
70
71 [7] https://git.trustedfirmware.org/TS/trusted
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