@end enumerate
@node 80x86 Calling Convention
-@appendixsec 80@var{x}86 Calling Convention
+@section 80@var{x}86 Calling Convention
What follows is a quick and dirty discussion of the 80@var{x}86
calling convention. Some of the basics should be familiar from CS
(defined in @file{threads/mmu.h}).
@node System Calls
-@appendixsec System Calls
+@section System Calls
We have already been dealing with one way that the operating system
can regain control from a user program: interrupts from timers and I/O