• 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 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.)

• 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 3.19 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/.

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