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-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\" Copyright 1997 Andries E. Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH vm86 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-vm86old, vm86 \- enter virtual 8086 mode
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/vm86.h>
-.P
-.BI "int vm86old(struct vm86_struct *" info );
-.BI "int vm86(unsigned long " fn ", struct vm86plus_struct *" v86 );
-.fi
-.SH DESCRIPTION
-The system call
-.BR vm86 ()
-was introduced in Linux 0.97p2.
-In Linux 2.1.15 and 2.0.28, it was renamed to
-.BR vm86old (),
-and a new
-.BR vm86 ()
-was introduced.
-The definition of
-.I struct vm86_struct
-was changed
-in 1.1.8 and 1.1.9.
-.P
-These calls cause the process to enter VM86 mode (virtual-8086 in Intel
-literature), and are used by
-.BR dosemu .
-.P
-VM86 mode is an emulation of real mode within a protected mode task.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-This return value is specific to i386 and indicates a problem with getting
-user-space data.
-.TP
-.B ENOSYS
-This return value indicates the call is not implemented on the present
-architecture.
-.TP
-.B EPERM
-Saved kernel stack exists.
-(This is a kernel sanity check; the saved
-stack should exist only within vm86 mode itself.)
-.SH STANDARDS
-Linux on 32-bit Intel processors.