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
       EPERM  Saved  kernel  stack exists. (This is a kernel sanity check; the saved stack
              should only exist within vm86 mode itself.)

       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.

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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