'seg' assembly instruction in .s file Post: 302461659

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vm86

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 intro-
       duced.  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 3.25 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/.

Linux								    2009-02-20								   VM86(2)