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ARMv7-A Operating system implementation

This is a fully functional operating system built over a RaspberryPi Bootloader. We used RaspberryPi version 2B for the sake of working with ARMv7 instruction set.

The following parts were implemented from scratch:

  1. Drivers (UART, LED, Timer)
  2. Library (kprintf, kscanf, some string related functions such as strcpy etc.)
  3. Memory (MMU, L1 and L2 page table)
  4. Exceptions (exception handlers, trampoline, routine for testing exceptions)
  5. Multithreading (RR-scheduler and threads, context switching mechanism etc.)
  6. Processes (memory segmentation, 8 processes and 8 process stacks, routine for testing processes)
  7. User interface (seperation mechanism between kernel and system, syscall interface for inter-process-communication)
  8. Heap (dynamic memory allocation using malloc and free, routine for testing heap robustness)