device « assembly « C Q&A

1. How should I get started on writing device drivers?    stackoverflow.com

I would like to learn how to write device drivers because I think it would be fun. I use a Mac OS X Macbook, but I also have an Ubuntu machine ...

2. Are cores (device abstraction level) of OSs written entirely in C? (Like: "UNIX is written in C")    stackoverflow.com

Are cores of OSs (device interaction level) really written in C, or "written in C" means that only most part of OS is written in C and interaction with devices is ...

3. store itdr on x64    stackoverflow.com

I tried to get idt address in my driver, I made function in asm which returns what idtr contains:

.data
  myData dq 0

.code
Function PROC
  sidt myData
  mov rax, myData
 ...