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| -rw-r--r-- | man2/vm86.2 | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/man2/vm86.2 b/man2/vm86.2 new file mode 100644 index 0000000..97595e8 --- /dev/null +++ b/man2/vm86.2 @@ -0,0 +1,58 @@ +.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu) +.\" Copyright 1997 Andries E. Brouwer (aeb@cwi.nl) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH vm86 2 2023-03-30 "Linux man-pages 6.05.01" +.SH NAME +vm86old, vm86 \- enter virtual 8086 mode +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <sys/vm86.h> +.PP +.BI "int vm86old(struct vm86_struct *" info ); +.BI "int vm86(unsigned long " fn ", struct vm86plus_struct *" v86 ); +.fi +.SH DESCRIPTION +The system call +.BR vm86 () +was introduced in Linux 0.97p2. +In Linux 2.1.15 and 2.0.28, it was renamed to +.BR vm86old (), +and a new +.BR vm86 () +was introduced. +The definition of +.I struct vm86_struct +was changed +in 1.1.8 and 1.1.9. +.PP +These calls cause the process to enter VM86 mode (virtual-8086 in Intel +literature), and are used by +.BR dosemu . +.PP +VM86 mode is an emulation of real mode within a protected mode task. +.SH RETURN VALUE +On success, zero is returned. +On error, \-1 is returned, and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EFAULT +This return value is specific to i386 and indicates a problem with getting +user-space data. +.TP +.B ENOSYS +This return value indicates the call is not implemented on the present +architecture. +.TP +.B EPERM +Saved kernel stack exists. +(This is a kernel sanity check; the saved +stack should exist only within vm86 mode itself.) +.SH STANDARDS +Linux on 32-bit Intel processors. |