The following items will be graded for this checkpoint. Programming assignment: src/pci.c pci_init Add delegation functions necessary to handle VirtIO devices. Make sure you properly handle type 0 and...

The following items will be graded for this checkpoint.

Programming assignment:

• src/pci.c
  
  
  • pci_init
  
  
  • Add delegation functions necessary to handle VirtIO devices.
  
  
  • Make sure you properly handle type 0 and type 1 devices.
  
  
  
  


• Add a file called src/virtio.c and associated src/include/virtio.h
  
  
  • In this file, set up the descriptor table, driver ring, and device ring for all VirtIO device. Recall VirtIO devices have a unique vendor ID in the PCI ECAM.
  
  
  • The Makefile will automatically pick up any *.c file in the src directory, so your virtio.c will be seen by the Makefile.
    
    
    • You may need to 'make clean' prior to building when you add a new file.
    
    
    
    
  
  
  
  


• src/main.c
  
  
  • 
    
    
    
    • Add pci_init() call. This will need to be made after the MMU is turned on and the paging/heap have all be initialized.
    
    
    
    
  
  
  
  


• Always consider asynchronicity when writing your code! If another HART could possibly map to a page table, it must be locked!

Create a tag called "checkpoint2". I will grade checkpoint2, or if that doesn't exist, the master branch.