vm86old, vm86 — enter virtual 8086 mode
||struct vm86_struct *info
||unsigned long fn,|
|struct vm86plus_struct *v86
The system call
introduced in Linux 0.97p2. In Linux 2.1.15 and 2.0.28, it
was renamed to
vm86old(), and a
vm86() was introduced. The
definition of struct
vm86_struct was changed in 1.1.8 and 1.1.9.
These calls cause the process to enter VM86 mode
(virtual-8086 in Intel literature), and are used by
VM86 mode is an emulation of real mode within a protected mode task.
On success, zero is returned. On error, −1 is
errno is set
This return value is specific to i386 and indicates a problem with getting user-space data.
This return value indicates the call is not implemented on the present architecture.
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.
This page is part of release 4.07 of the Linux
man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
Copyright 1993 Rickard E. Faith (faithcs.unc.edu)
Copyright 1997 Andries E. Brouwer (aebcwi.nl)
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.