Copyright 1993 Rickard E. Faith (firstname.lastname@example.org) Copyright 1997 Andries E. Brouwer (email@example.com) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a per...
NAMEvm86old, vm86 - enter virtual 8086 mode
int vm86old(struct vm86_struct *info);
int vm86(unsigned long fn, struct vm86plus_struct *v86);
DESCRIPTIONThe 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 VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
- This return value is specific to i386 and indicates a problem with getting user-space data.
- This return value indicates the call is not implemented on the present architecture.
- Saved kernel stack exists. (This is a kernel sanity check; the saved stack should exist only within vm86 mode itself.)