Things to know for the test
 

• Hardware Stuff
• What is a PIC?
• How does the speaker work?
• What is a tick?
• How would you change the value for tick?
• Kernel Interface
• General Stuff
• How do you get the PID, UID, etc
• How do you get the current time of day
• How can you tell if a pointer is a valid pointer?
• What do you return if the pointer is invalid?
• What is a module
• What's the module init code, and what does it return, and how can you change it's name.
• What's the module finish code, and what does it return, and how can you change it's name.
• Suppose you don't want your module to load, how can you prevent it
• Where does the detect-the-device code go
• How can I tell what modules are already loaded
• How do I load and unload
• What is the module_author, module_description macros?
• File System Basics
• What is a device file
• What are major and minor numbers, how big can they be, are they signed
• What's the difference between block and char
• Can a block and a char share the same major and minor number
• Can more than one device file share a common major and minor number
• How do I make a device file?  Must I be root?
• The File System calls
• What is an fops structure?  What do
• What generates an open, read, write, release?
• How does caching effect this?
• What do you return for eof?  What do you return for permission denied?
• If they should not access the file, which function decides that?
• What if they ask for 1000 bytes, and you give them 500?
• What if they ask for 1000 byte, and you give them 2000?
• Proc file system
• How do I register a file?  How about a device file, or a directory?
• Do proc files have a major and minor number
• Memory managment
• How can I allocate ram?  Is this ram swappable?  Whats the most I can allocate
• What is __va?
• Are pointers from the user in userspace or kernelspace?
• How do you copy from/to userspace?
• How do I delay and then get a function called
• Driver Basics
• What is the top and bottom half?
• How do you register a major number?
• How do you register a minor number?
• Where is the file position kept?
• What is a fileposition?
• How do you change that (at least two answers)
• What is file->f_privatedata
• How do you read or write to a port?
• Other things
• If I allocate an array outside of any function, does it survive between function calls?
• What is 'static'?
• makefiles
• #define
• FUSD
• What is it
• What are the advantages/disadvantages
• What are it's components
• USB
• Speed
• Four transfer types
• Is it a block or a char device?