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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	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 3.74 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
       http://www.kernel.org/doc/man-pages/.

Linux				  2009-02-20			       VM86(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | COLOPHON

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