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 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 Intel processors, and
should not be used in programs intended to be portable.
Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
Copyright 1997 Andries E. Brouwer (aeb@cwi.nl)
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