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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | COLOPHON |
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
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 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 4.12 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
https://www.kernel.org/doc/man-pages/.
Linux 2009-02-20 VM86(2)
Pages that refer to this page: modify_ldt(2), syscalls(2), unimplemented(2), systemd.exec(5)