Glossary of terms and abbreviations

AAPCS: ARM Architecture Procedure Call Standard: The AAPCS defines how subroutines can be separately written, separately compiled, and separately assembled to work together. It describes a contract between a calling routine and a called routine
Application RoT: PSA term. The security domain in which additional security services are implemented.
HAL: Hardware Abstraction Layer: Interface to abstract hardware-oriented operations and provides a set of APIs to the upper layers.
ITS
Internal Trusted Storage: One of PSA services provided by TF-M.
MPC: Memory Protection Controller: Bus slave-side security controller for memory regions.
MPU: Memory Protection Unit: Hardware component providing privilege control.
NSPE: Non Secure Processing Enviroment: PSA term. In TF-M this means non secure domain typically running an OS using services provided by TF-M.
PPC: Peripheral Protection Controller: Bus slave-side security controller for peripheral access.
PS
Protected Storage: One of PSA services provided by TF-M.
PSA: PSA term. Platform Security Architecture.
PSA RoT: PSA term. This defines the most trusted security domain within a PSA system.
PSA-FF: PSA term. Platform Security Architecture Firmware Framework.
PSA-FF-M: PSA term. Platform Security Architecture Firmware Framework for M.
RoT: Root of Trust: PSA term. This is the minimal set of software, hardware and data that is implicitly trusted in the platform — there is no software or hardware at a deeper level that can verify that the Root of Trust is authentic and unmodified.
RoT Service: PSA term. A set of related security operations that are implemented in a Secure Partition.
S/NS: Secure/Non-secure: The separation provided by TrustZone hardware components in the system.
SAU: Secure Attribution Unit: Hardware component providing isolation between Secure, Non-secure Callable and Non-secure addresses.
SFN: Secure Function: The function entry to a secure service. Multiple SFN per SS are permitted.
SP
Secure Partition: A logical container for secure services.
SPE: Secure Processing Environment: PSA term. In TF-M this means the secure domain protected by TF-M.
SPM
Secure Partition Manager: The TF-M component responsible for enumeration, management and isolation of multiple Secure Partitions within the TEE.
SPRT: Secure Partition Runtime: The TF-M component responsible for Secure Partition runtime functionalities.
SPRTL: Secure Partition Runtime Library: A library contains the SPRT code and data.
SS: Secure Service: A component within the TEE that is atomic from a security/trust point of view, i.e. which is viewed as a single entity from a TF-M point of view.
SVC: SuperVisor Call: ARMv7M assembly instruction to call a privileged handler function
TBSA-M: Trusted Base System Architecture for M. TBSA term. See Trusted Base System Architecture for M
TFM
TF-M: Trusted Firmware-M or Trusted Firmware for M-class. ARM TF-M provides a reference implementation of secure world software for ARMv8-M.

Reference

Firmware Framework for M (FF-M)

Trusted Base System Architecture for M