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int vm86old(struct vm86_struct *info);
int vm86(unsigned long fn, struct vm86plus_struct *v86);
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 intro-
duced. The definition of struct vm86_struct was changed in 1.1.8 and
These calls cause the process to enter VM86 mode (virtual-8086 in Intel
literature), and are used by dosemu.
VM86 mode is an emulation of real mode within a protected mode task.
On success, zero is returned. On error, -1 is returned, and errno is
EFAULT This return value is specific to i386 and indicates a problem
with getting user-space data.
ENOSYS This return value indicates the call is not implemented on the
EPERM Saved kernel stack exists. (This is a kernel sanity check; the
saved stack should exist only within vm86 mode itself.)
This call is specific to Linux on 32-bit Intel processors, and should
not be used in programs intended to be portable.
Linux 2009-02-20 VM86(2)