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Compiler/TM4C129ENCPDT: time() and clock() without RTOS or other

Part Number: TM4C129ENCPDT

Tool/software: TI C/C++ Compiler

Before reading the wiki, I implemented something like clock() for the mbedTLS library by accessing the ARM cycle counter. Now, I'm discovering that I probably need to implement time() in a POSIX compliant manner, possibly leveraging the Hibernate / RTC peripheral. I am not using TI RTOS or any other operating system. This is a bare-metal firmware design.

Are there any Application Notes or other documentation for the TM4C129 family with regard to setting up the clock() and time() functions? It seems like the TM4C has plenty of hardware support for these features, so it shouldn't be necessary to cook up an entirely custom implementation.

Is there a specific document for RTS on ARM? (Run-Time Support). I looked through my collection of documents and don't see anything.