Porting ATMega8 AVR based program to Intel Curie Processor
Those variables are the addresses of physical registers on the AVR that manipulate its timer/counters. Most other processors will have equivalent, but not likely identical, hardware. You'll need to port functionality, not the code.

You'll need to reverse-engineer (worst-case) the code you're trying to port (assuming you aren't intimately familiar with it, e.g., you designed it), develop a spec for it (at least in your head), and write to that spec for the Curie.

If the overall job is not (too heavily) processor-specific, you may be able to write it to be portable by writing the job-specific code in, e.g., in C, and call well-defined functions (in C or assembler) for the CPU-specific ones, that could easily be replicated on another processor.