blob: 4ebe2fb9d7feeb1cdf25356f06a655d6d93728ce (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Virtual Accelerator Switchboard (VAS) — skiboot 20e245a
documentation</title>
<link rel="stylesheet" href="_static/classic.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<script type="text/javascript" src="_static/language_data.js"></script>
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="Secure and Trusted Boot Library (LibSTB) Documentation" href="stb.html" />
<link rel="prev" title="MPIPL (aka FADUMP) Overview" href="mpipl.html" />
</head><body>
<div class="related" role="navigation" aria-label="related navigation">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="genindex.html" title="General Index"
accesskey="I">index</a></li>
<li class="right" >
<a href="stb.html" title="Secure and Trusted Boot Library (LibSTB) Documentation"
accesskey="N">next</a> |</li>
<li class="right" >
<a href="mpipl.html" title="MPIPL (aka FADUMP) Overview"
accesskey="P">previous</a> |</li>
<li class="nav-item nav-item-0"><a href="index.html">skiboot 20e245a
documentation</a> »</li>
</ul>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<div class="section" id="virtual-accelerator-switchboard-vas">
<h1>Virtual Accelerator Switchboard (VAS)<a class="headerlink" href="#virtual-accelerator-switchboard-vas" title="Permalink to this headline">¶</a></h1>
<p>This document provides information about using VAS from user space.
Applications send NX requests using COPY/PASTE instructions. NX raises
an interrupt when it sees fault on the request buffer. Kernel handles
the interrupt and process the fault.</p>
<p>Skiboot allocates the IRQ and exports it with interrupts property. To
provide backward compatibility for older kernels, enable VAS user space
support with NVRAM command.</p>
<blockquote>
<div>nvram -p ibm,skiboot –update-config vas-user-space=enable</div></blockquote>
<p>This nvram config update is temporary and can be removed in future if
not needed.</p>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
<div class="sphinxsidebarwrapper">
<h4>Previous topic</h4>
<p class="topless"><a href="mpipl.html"
title="previous chapter">MPIPL (aka FADUMP) Overview</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="stb.html"
title="next chapter">Secure and Trusted Boot Library (LibSTB) Documentation</a></p>
<div role="note" aria-label="source link">
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="_sources/vas.rst.txt"
rel="nofollow">Show Source</a></li>
</ul>
</div>
<div id="searchbox" style="display: none" role="search">
<h3>Quick search</h3>
<div class="searchformwrapper">
<form class="search" action="search.html" method="get">
<input type="text" name="q" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="related" role="navigation" aria-label="related navigation">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="genindex.html" title="General Index"
>index</a></li>
<li class="right" >
<a href="stb.html" title="Secure and Trusted Boot Library (LibSTB) Documentation"
>next</a> |</li>
<li class="right" >
<a href="mpipl.html" title="MPIPL (aka FADUMP) Overview"
>previous</a> |</li>
<li class="nav-item nav-item-0"><a href="index.html">skiboot 20e245a
documentation</a> »</li>
</ul>
</div>
<div class="footer" role="contentinfo">
© Copyright 2016-2017, IBM, others.
Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.8.5.
</div>
</body>
</html>
|