Hi,

After couples of patches get merged, the Secure Partition runtime library prototype is available. The purpose of this library (aka SPRTL) is to provide a place for shared functions between secure partitions under isolation level 2/3 which could avoid duplicated code symbols in Secure Partitions. The situation is:

- There is a folder for SPE dedicated function implementation: 'secure_fw/lib/sprt'. More APIs can be put in SPRTL by modifying the makefiles under this folder.

- Keep using toolchain provided 'memset/memcpy' due to inherit them is a bit complicated (of course these toolchain symbols are put in the shared region to avoid duplication). And we keep the customized candidate in source code for further investigation to see if we need this customized version or the default version.

- Overriding toolchain 'memcmp' into a customized version to show security consideration.

- Implemented a customized 'tfm_log_printf' to replace 'printf', which could avoid involving complicated STDIO mechanism into the code base.

- PSA FF APIs are now in it.

These changes are now working under the code base, some other functions are not available yet and to be done later due to no actual requirement for them, such as:

- Heap APIs, now crypto uses its own implemented heap while other services do not need them.

- RoT Service APIs, would request service owner to move the existing RoT Service APIs into SPRTL (should be just some function attribute change, let's check it).

Any feedbacks or issue reporting is welcome, please reply in the mailing list or create an issue at developer.trustedfirmware.org and assign to ‘KenLSoft’.

BR and thanks.

/Ken