alternate to sys/mmap.h if I am not using HPS ?

Hi,

I understand sys/mmap.h is used to do memory mapped operations(read/ write to memory) while using HPS in linux environment.

But suppose I try to do the same in other designs where I wont be using HPS / in NIOS eclipse environment, the eclipse tool couldnt recognize sys/mann.h file.

So what is the alternative to do the same in eclipse tool? How to map memory of an FPGA in eclipse tool?

regards,

Yogesh