projects / thirdparty / man-pages.git / blame
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1 | .\" Hey Emacs! This file is -*- nroff -*- source. |
| 2 | .\" | |
| 3 | .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu) | |
| 4 | .\" Copyright 1997 Andries E. Brouwer (aeb@cwi.nl) | |
| 5 | .\" | |
| 6 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 7 | .\" manual provided the copyright notice and this permission notice are | |
| 8 | .\" preserved on all copies. | |
| 9 | .\" | |
| 10 | .\" Permission is granted to copy and distribute modified versions of this | |
| 11 | .\" manual under the conditions for verbatim copying, provided that the | |
| 12 | .\" entire resulting derived work is distributed under the terms of a | |
| 13 | .\" permission notice identical to this one. | |
| c13182ef | 14 | .\" |
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15 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 16 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 17 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 18 | .\" the use of the information contained herein. The author(s) may not | |
| 19 | .\" have taken the same level of care in the production of this manual, | |
| 20 | .\" which is licensed free of charge, as they might when working | |
| 21 | .\" professionally. | |
| c13182ef | 22 | .\" |
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23 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 24 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 25 | .\" | |
| d9343c5c | 26 | .TH VM86 2 1997-07-17 "Linux" "Linux Programmer's Manual" |
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27 | .SH NAME |
| 28 | vm86old, vm86 \- enter virtual 8086 mode | |
| 29 | .SH SYNOPSIS | |
| 30 | .B #include <sys/vm86.h> | |
| 31 | .sp | |
| 32 | .BI "int vm86old(struct vm86_struct *" info ); | |
| 33 | .sp | |
| 34 | .BI "int vm86(unsigned long " fn ", struct vm86plus_struct *" v86 ); | |
| 35 | .SH DESCRIPTION | |
| 36 | The system call | |
| e511ffb6 | 37 | .BR vm86 () |
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38 | was introduced in Linux 0.97p2. |
| 39 | In Linux 2.1.15 and 2.0.28 it was renamed to | |
| e511ffb6 | 40 | .BR vm86old (), |
| fea681da | 41 | and a new |
| e511ffb6 | 42 | .BR vm86 () |
| c13182ef | 43 | was introduced. |
| 2b0fa182 | 44 | The definition of \fIstruct vm86_struct\fP was changed |
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45 | in 1.1.8 and 1.1.9. |
| 46 | .LP | |
| 47 | These calls cause the process to enter VM86 mode (virtual-8086 in Intel | |
| c13182ef | 48 | literature), and are used by |
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49 | .BR dosemu . |
| 50 | .PP | |
| 51 | VM86 mode is an emulation of real mode within a protected mode task. | |
| 52 | .SH "RETURN VALUE" | |
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53 | On success, zero is returned. |
| 54 | On error, \-1 is returned, and | |
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55 | .I errno |
| 56 | is set appropriately. | |
| 57 | .SH ERRORS | |
| 58 | .TP | |
| 59 | .B EFAULT | |
| 60 | This return value is specific to i386 and indicates a problem with getting | |
| 61 | userspace data. | |
| 62 | .TP | |
| 63 | .B ENOSYS | |
| 64 | This return value indicates the call is not implemented on the present | |
| 65 | architecture. | |
| 66 | .TP | |
| 67 | .B EPERM | |
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68 | Saved kernel stack exists. |
| 69 | (This is a kernel sanity check; the saved | |
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70 | stack should only exist within vm86 mode itself.) |
| 71 | .SH "CONFORMING TO" | |
| 72 | This call is specific to Linux on Intel processors, and should not be | |
| 73 | used in programs intended to be portable. |