1 .. SPDX-License-Identifier: GPL-2.0 2 .. tee: 3 4 ================================================== 5 TEE (Trusted Execution Environment) Userspace API 6 ================================================== 7 8 include/uapi/linux/tee.h defines the generic interface to a TEE. 9 10 User space (the client) connects to the driver by opening /dev/tee[0-9]* or 11 /dev/teepriv[0-9]*. 12 13 - TEE_IOC_SHM_ALLOC allocates shared memory and returns a file descriptor 14 which user space can mmap. When user space doesn't need the file 15 descriptor any more, it should be closed. When shared memory isn't needed 16 any longer it should be unmapped with munmap() to allow the reuse of 17 memory. 18 19 - TEE_IOC_VERSION lets user space know which TEE this driver handles and 20 its capabilities. 21 22 - TEE_IOC_OPEN_SESSION opens a new session to a Trusted Application. 23 24 - TEE_IOC_INVOKE invokes a function in a Trusted Application. 25 26 - TEE_IOC_CANCEL may cancel an ongoing TEE_IOC_OPEN_SESSION or TEE_IOC_INVOKE. 27 28 - TEE_IOC_CLOSE_SESSION closes a session to a Trusted Application. 29 30 There are two classes of clients, normal clients and supplicants. The latter is 31 a helper process for the TEE to access resources in Linux, for example file 32 system access. A normal client opens /dev/tee[0-9]* and a supplicant opens 33 /dev/teepriv[0-9]. 34 35 Much of the communication between clients and the TEE is opaque to the 36 driver. The main job for the driver is to receive requests from the 37 clients, forward them to the TEE and send back the results. In the case of 38 supplicants the communication goes in the other direction, the TEE sends 39 requests to the supplicant which then sends back the result.
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