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


     vm86old, vm86 - enter virtual 8086 mode


     #include <sys/vm86.h>
     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 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.)


     This  call  is specific to Linux on 32-bit Intel processors, and should
     not be used in programs intended to be portable.


     This page is part of release 4.16 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

Linux 2009-02-20 VM86(2)

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