vm86old, vm86 — enter virtual 8086 mode
#include <sys/vm86.h>
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 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
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 set
appropriately.
This return value is specific to i386 and indicates a problem with getting userspace 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 only exist 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 3.24 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |