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3 .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
4 .\" Copyright 1997 Andries E. Brouwer (aeb@cwi.nl)
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26 .TH VM86 2 2009-02-20 "Linux" "Linux Programmer's Manual"
28 vm86old, vm86 \- enter virtual 8086 mode
30 .B #include <sys/vm86.h>
32 .BI "int vm86old(struct vm86_struct *" info );
34 .BI "int vm86(unsigned long " fn ", struct vm86plus_struct *" v86 );
38 was introduced in Linux 0.97p2.
39 In Linux 2.1.15 and 2.0.28 it was renamed to
44 The definition of \fIstruct vm86_struct\fP was changed
47 These calls cause the process to enter VM86 mode (virtual-8086 in Intel
48 literature), and are used by
51 VM86 mode is an emulation of real mode within a protected mode task.
53 On success, zero is returned.
54 On error, \-1 is returned, and
60 This return value is specific to i386 and indicates a problem with getting
64 This return value indicates the call is not implemented on the present
68 Saved kernel stack exists.
69 (This is a kernel sanity check; the saved
70 stack should only exist within vm86 mode itself.)
72 This call is specific to Linux on 32-bit Intel processors,
73 and should not be used in programs intended to be portable.