Operating system becomes protected

These are the latest OS news (what has been done):
- Gathering RAM size via BIOS
- Reading from HD via I/O ports
- Gathering HD size via I/O ports
- VGA display
- Protected Mode

At this point OS loads a stage-one boot loader, which gathers RAM size and loads a second stage boot loader from file system. Second stage boot-loader gathers HD size, prepares VGA display and goes into PM.

This is it at the moment. Other projects are frozen at the moment.