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VM86(2) 		   Linux Programmers Manual		      VM86(2)

       vm86old, vm86 - enter virtual 8086 mode


       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	intro
       duced.	The  definition of struct vm86_struct was changed in 1.1.8 and

       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.

       EFAULT This return value is specific to i386 and  indicates  a  problem
	      with getting userspace 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 only exist within vm86 mode itself.)

       This  call  is specific to Linux on Intel processors, and should not be
       used in programs intended to be portable.

       This page is part of release 3.05 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				  1997-07-17			       VM86(2)

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