The Userspace

In this part we are going to study how to get to userspace, and back. Although it is focused on x86_64, a lot of high level concepts apply to other platforms too.

The below the list of chapters:

• Overview An high level introduction to what to expect when switching to user mode, and what will be covered by this part.
• Switching Modes How to switch modes between user and supervisor
• Handling Interrupts Handling interrupts while in User Mode
• System Calls Introduction to the system calls
• An Example Syscall ABI Implementing an example system call.
• Resource Management Resource Management.