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<html> <head> <title>vm86</title> <META NAME="KEYWORDS" CONTENT="vm86"> </head> <body BGCOLOR="#ffffff" LINK="#0000ff" VLINK="#0000ff" ALINK="#0000ff" TEXT="#000000"> <center> <h1><b>vm86</b></h1></center> <PRE> <STRONG><A HREF="/man2/VM86">VM86(2)</A></STRONG> Linux Programmer's Manual <STRONG><A HREF="/man2/VM86">VM86(2)</A></STRONG> NAME vm86old, vm86 - enter virtual 8086 mode SYNOPSIS #include <sys/vm86.h> int vm86old(struct vm86_struct *info); int vm86(unsigned long fn, struct vm86plus_struct *v86); DESCRIPTION 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 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. RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS 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 present architecture. EPERM Saved kernel stack exists. (This is a kernel sanity check; the saved stack should exist only within vm86 mode itself.) CONFORMING TO This call is specific to Linux on 32-bit Intel processors, and should not be used in programs intended to be portable. COLOPHON This page is part of release 5.05 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 https://www.kernel.org/doc/man-pages/. Linux 2009-02-20 <STRONG><A HREF="/man2/VM86">VM86(2)</A></STRONG></PRE> <center> <h6>Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2025 <a href="http://www.he.net">Hurricane Electric</a>. All Rights Reserved.</h6></center> </body> </html>