How to get system memory map

[n0p0n3]

I have a few quick questions. I've been designing a hobby operating system for awhile and I've finally gotten around to starting to code it. I decided to use UEFI as a starting point instead of dealing with setting up the hardware oldschool style, and I'm loving that you've made this project, because I haven't fully studied the uefi spec yet, but I tend to write psuedocode as object oriented ansi-c in my head. Anyway, the questions. What state does this project leave the hardware in when setting up? Is long mode entered? How would I access the memorymap, through GetMemoryMap still? I didn't see this information, but I'm not familiar with visualstudio either. I'm used to linux, never did much writing myself, but I've built several complete Linux from scratch systems, so I'm familiar with some aspects of compiling.