vm86, vm86old - enter virtual 8086 mode
int vm86(unsigned long fn, struct
vm86plus_struct * v86);
int vm86old(struct vm86_struct *
The system call vm86 was introduced in Linux 0.97p2.
In Linux 2.1.15 and 2.0.28 it was renamed to vm86old,
and a new vm86 was introduced. The definition of
`struct vm86_struct' was changed in 1.1.8 and
These calls cause the process to enter VM86 mode, and are
used by dosemu (dos(1)?).
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
Saved kernel stack exists. (This is a kernel sanity check;
the saved stack should only exist within vm86 mode
This call is specific to Linux on Intel processors, and
should not be used in programs intended to be