Section (2) vm86
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 4.16 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)
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