CentOS 7.0 - man page for vm86 (centos section 2)

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VM86(2) 			    Linux Programmer's Manual				  VM86(2)

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	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.

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 architec-
	      ture.

       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 pro-
       grams intended to be portable.

COLOPHON
       This page is part of release 3.53 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/.

Linux					    2009-02-20					  VM86(2)
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