120 lines
2.7 KiB
HTML
120 lines
2.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of VM86</TITLE>
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</HEAD><BODY>
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<H1>VM86</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2009-02-20<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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vm86old, vm86 - enter virtual 8086 mode
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>#include <<A HREF="file:///usr/include/sys/vm86.h">sys/vm86.h</A>></B>
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<P>
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<B>int vm86old(struct vm86_struct *</B><I>info</I><B>);</B>
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<P>
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<B>int vm86(unsigned long </B><I>fn</I><B>, struct vm86plus_struct *</B><I>v86</I><B>);</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The system call
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<B>vm86</B>()
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was introduced in Linux 0.97p2.
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In Linux 2.1.15 and 2.0.28, it was renamed to
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<B>vm86old</B>(),
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and a new
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<B>vm86</B>()
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was introduced.
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The definition of
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<I>struct vm86_struct</I>
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was changed
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in 1.1.8 and 1.1.9.
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<P>
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These calls cause the process to enter VM86 mode (virtual-8086 in Intel
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literature), and are used by
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<B>dosemu</B>.
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<P>
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VM86 mode is an emulation of real mode within a protected mode task.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, zero is returned.
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On error, -1 is returned, and
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<I>errno</I>
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is set appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="1"><B>EFAULT</B>
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<DD>
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This return value is specific to i386 and indicates a problem with getting
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user-space data.
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<DT id="2"><B>ENOSYS</B>
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<DD>
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This return value indicates the call is not implemented on the present
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architecture.
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<DT id="3"><B>EPERM</B>
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<DD>
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Saved kernel stack exists.
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(This is a kernel sanity check; the saved
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stack should exist only within vm86 mode itself.)
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</DL>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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This call is specific to Linux on 32-bit Intel processors,
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and should not be used in programs intended to be portable.
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<A NAME="lbAH"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="8"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="9"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="10"><A HREF="#lbAH">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:35 GMT, March 31, 2021
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</BODY>
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</HTML>
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