Really mini operating system (extracted from xen-unstable, and much stuff removed)
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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 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.