[RFC] Virtual 8086 mode support for kernel drivers

Hi,

This the current version of my patch for vm86 mode support. I'm posting this
time here because it looks like the more apropriate place. ;-)

The syscall is now gone. The new API may be used from kernel drivers but only
on behalf of a user thread, e.g. from a ioctl() syscall. A typical usage will
look like the following. Error checking left out for simplicity...

{
	struct vm86_state state;

	vm86_prepare(&state, VM86_MIN_RAM_SIZE);

	state.regs.eax = 0x4f00;
	state.regs.ebx = 0x8115;
	vm86_do_int(&state, 0x10);

	vm86_cleanup(&state);
}

I picked up Ingo's suggestion for a "page_fault_callback" to catch unhandled
page faults in vm86 mode. See the last patch in the series for the details.

Any suggestions/comments are welcome. :-)

/Jan

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