vm86 - phpMan

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 litera-
       ture), 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 appropri-
       ately.

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 Intel processors, and should not be used in  pro-
       grams intended to be portable.



Linux 2.1.15                      1997-07-17                           VM86(2)

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