|VM86(2)||Linux Programmer's Manual||VM86(2)|
NAMEvm86old, vm86 - enter virtual 8086 mode
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.)
CONFORMING TOThis call is specific to Linux on 32-bit Intel processors, and should not be used in programs intended to be portable.
COLOPHONThis page is part of release 3.53 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/.