Where to find the documentation explaining some hps I/O function?

[Altera_Forum]

Hello, everyone, 

I am learning the SOC. In a demonstration I find some function such as alt_write_word(). And I want to find the documentation which explains them so I can learn about the functons and use them. I have looked for in Altera's homepage but didn't find.So if you know please tell me. Thank you very much!

[Altera_Forum]

Yes, documentation is very big and helpful on 20% for unpractised beginners, is no reply on question "why?" and "why just so?", and only "take that we give and be glad!" :) 

I ask Altera to add in SoC EDS distribution all used pdf-s with creating HWLIB or direct links to it on sites of owners with comment in .c, which .pdf-s used for developing. You must say concrete point in HWLIB, where is understanding. Mainly will need search in arm.com (infocenter.arm.com) and ug_embedded_ip.pdf from Altera. Let in alt_interrupt.c many comments "See GIC 1.0", which not found on ARM site :)  P.S. Or best way -- in chorus ask Altera for write normal HWLIB documentation with man participation, not through heartless Doxygen ! :) ...Or independently write it on Wiki... Suddently somebody understand something... :)