Minimal OS

This shows some of the stuff that any guest OS will have to set up.

This includes:

• installing a virtual exception table
• handling virtual exceptions
• handling asynchronous events
• enabling/disabling async events
• parsing start_info struct at start-of-day
• registering virtual interrupt handlers (for timer interrupts)
• a simple page and memory allocator
• minimal libc support
• minimal Copy-on-Write support
• network, block, framebuffer support
• transparent access to FileSystem exports (see tools/fs-back)

• to build it just type make.

• to build it with TCP/IP support, download LWIP 1.3.2 source code and type

  make LWIPDIR=/path/to/lwip/source

• to build it with much better libc support, see the stubdom/ directory

• to start it do the following in domain0 (assuming xend is running)

  xm create domain_config

This starts the kernel and prints out a bunch of stuff and then once every second the system time.

If you have setup a disk in the config file (e.g. disk = [ 'file:/tmp/foo,hda,r' ] ), it will loop reading it. If that disk is writable (e.g. disk = [ 'file:/tmp/foo,hda,w' ] ), it will write data patterns and re-read them.

If you have setup a network in the config file (e.g. vif = [''] ), it will print incoming packets.

If you have setup a VFB in the config file (e.g. vfb = ['type=sdl'] ), it will show a mouse with which you can draw color squares.

If you have compiled it with TCP/IP support, it will run a daytime server on TCP port 13.