Originální popis anglicky:
vm86old, vm86 - enter virtual 8086 mode
Návod, kniha: Linux Programmer's Manual
#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 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.)
This call is specific to Linux on Intel processors, and should not be used in
programs intended to be portable.
