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<a class="el" href="dir_897b6a2d7bab147dd1db58381aad3984.html">src</a> » <a class="el" href="dir_832905b1f7f5feaf61a306b40c0ac817.html">sys</a> » <a class="el" href="dir_b87deefade4e886319aa926bd3ba1491.html">vmm</a></div>
<h1>createvirtualspace.c</h1><a href="createvirtualspace_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*****************************************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (c) 2002 The UbixOS Project</span>
<a name="l00003"></a>00003 <span class="comment"> All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">Redistribution and use in source and binary forms, with or without modification, are</span>
<a name="l00006"></a>00006 <span class="comment">permitted provided that the following conditions are met:</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment">Redistributions of source code must retain the above copyright notice, this list of</span>
<a name="l00009"></a>00009 <span class="comment">conditions, the following disclaimer and the list of authors. Redistributions in binary</span>
<a name="l00010"></a>00010 <span class="comment">form must reproduce the above copyright notice, this list of conditions, the following</span>
<a name="l00011"></a>00011 <span class="comment">disclaimer and the list of authors in the documentation and/or other materials provided</span>
<a name="l00012"></a>00012 <span class="comment">with the distribution. Neither the name of the UbixOS Project nor the names of its</span>
<a name="l00013"></a>00013 <span class="comment">contributors may be used to endorse or promote products derived from this software</span>
<a name="l00014"></a>00014 <span class="comment">without specific prior written permission.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment">THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY</span>
<a name="l00017"></a>00017 <span class="comment">EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span>
<a name="l00018"></a>00018 <span class="comment">MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL</span>
<a name="l00019"></a>00019 <span class="comment">THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00020"></a>00020 <span class="comment">SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span>
<a name="l00021"></a>00021 <span class="comment">OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
<a name="l00022"></a>00022 <span class="comment">HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR</span>
<a name="l00023"></a>00023 <span class="comment">TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00024"></a>00024 <span class="comment">SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment"> $Log: createvirtualspace_8c-source.html,v $
<a name="l00026"></a>00026 <span class="comment"> Revision 1.7 2006/12/15 17:47:04 reddawg
<a name="l00026"></a>00026 <span class="comment"> Updates
<a name="l00026"></a>00026 <span class="comment"></span>
<a name="l00027"></a>00027 <span class="comment"> Revision 1.1.1.1 2006/06/01 12:46:13 reddawg</span>
<a name="l00028"></a>00028 <span class="comment"> ubix2</span>
<a name="l00029"></a>00029 <span class="comment"></span>
<a name="l00030"></a>00030 <span class="comment"> Revision 1.2 2005/10/12 00:13:38 reddawg</span>
<a name="l00031"></a>00031 <span class="comment"> Removed</span>
<a name="l00032"></a>00032 <span class="comment"></span>
<a name="l00033"></a>00033 <span class="comment"> Revision 1.1.1.1 2005/09/26 17:24:50 reddawg</span>
<a name="l00034"></a>00034 <span class="comment"> no message</span>
<a name="l00035"></a>00035 <span class="comment"></span>
<a name="l00036"></a>00036 <span class="comment"> Revision 1.2 2004/07/28 15:05:43 reddawg</span>
<a name="l00037"></a>00037 <span class="comment"> Major:</span>
<a name="l00038"></a>00038 <span class="comment"> Pages now have strict security enforcement.</span>
<a name="l00039"></a>00039 <span class="comment"> Many null dereferences have been resolved.</span>
<a name="l00040"></a>00040 <span class="comment"> When apps loaded permissions set for pages rw and ro</span>
<a name="l00041"></a>00041 <span class="comment"></span>
<a name="l00042"></a>00042 <span class="comment"> Revision 1.1.1.1 2004/04/15 12:06:51 reddawg</span>
<a name="l00043"></a>00043 <span class="comment"> UbixOS v1.0</span>
<a name="l00044"></a>00044 <span class="comment"></span>
<a name="l00045"></a>00045 <span class="comment"> Revision 1.8 2004/04/13 16:36:34 reddawg</span>
<a name="l00046"></a>00046 <span class="comment"> Changed our copyright, it is all now under a BSD-Style license</span>
<a name="l00047"></a>00047 <span class="comment"></span>
<a name="l00048"></a>00048 <span class="comment"></span>
<a name="l00049"></a>00049 <span class="comment"></span>
<a name="l00050"></a>00050 <span class="comment"> $Id: createvirtualspace_8c-source.html 88 2016-01-12 00:11:29Z reddawg $</span>
<a name="l00051"></a>00051 <span class="comment"></span>
<a name="l00052"></a>00052 <span class="comment">*****************************************************************************************/</span>
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="preprocessor">#include <<a class="code" href="vmm_8h.html">vmm/vmm.h</a>></span>
<a name="l00055"></a>00055
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="comment">/************************************************************************</span>
<a name="l00058"></a>00058 <span class="comment"></span>
<a name="l00059"></a>00059 <span class="comment">Function: void *vmmCreateVirtualSpace(pid_t);</span>
<a name="l00060"></a>00060 <span class="comment">Description: Creates A Virtual Space For A New Task</span>
<a name="l00061"></a>00061 <span class="comment">Notes:</span>
<a name="l00062"></a>00062 <span class="comment"></span>
<a name="l00063"></a>00063 <span class="comment">07/30/02 - This Is Going To Create A New VM Space However Its Going To</span>
<a name="l00064"></a>00064 <span class="comment"> Share The Same Top 1GB Space With The Kernels VM And Lower</span>
<a name="l00065"></a>00065 <span class="comment"> 1MB Of VM Space With The Kernel</span>
<a name="l00066"></a>00066 <span class="comment"></span>
<a name="l00067"></a>00067 <span class="comment">07/30/02 - Note This Is Going To Get The Top 1Gig And Lower 1MB Region</span>
<a name="l00068"></a>00068 <span class="comment"> From The Currently Loaded Page Directory This Is Safe Because</span>
<a name="l00069"></a>00069 <span class="comment"> All VM Spaces Will Share These Regions</span>
<a name="l00070"></a>00070 <span class="comment"></span>
<a name="l00071"></a>00071 <span class="comment">07/30/02 - Note I Realized A Mistake The First Page Table Will Need To Be</span>
<a name="l00072"></a>00072 <span class="comment"> A Copy But The Page Tables For The Top 1GB Will Not Reason For</span>
<a name="l00073"></a>00073 <span class="comment"> This Is That We Just Share The First 1MB In The First Page Table</span>
<a name="l00074"></a>00074 <span class="comment"> So We Will Just Share Physical Pages.</span>
<a name="l00075"></a>00075 <span class="comment"></span>
<a name="l00076"></a>00076 <span class="comment">08/02/02 - Added Passing Of pid_t pid For Better Tracking Of Who Has Which</span>
<a name="l00077"></a>00077 <span class="comment"> Set Of Pages</span>
<a name="l00078"></a>00078 <span class="comment"></span>
<a name="l00079"></a>00079 <span class="comment">************************************************************************/</span>
<a name="l00080"></a>00080 <span class="keywordtype">void</span> *
<a name="l00081"></a><a class="code" href="createvirtualspace_8c.html#c8f92aa05b669f43457fed9002d6cb40">00081</a> <a class="code" href="paging_8h.html#39ac9b6ea58fc8b6f129775642077c99">vmmCreateVirtualSpace</a>(<a class="code" href="types_8h.html#288e13e815d43b06e75819f8939524df">pid_t</a> pid)
<a name="l00082"></a>00082 {
<a name="l00083"></a>00083 <span class="keywordtype">void</span> *newPageDirectoryAddress = 0x0;
<a name="l00084"></a>00084 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *parentPageDirectory = 0x0, *newPageDirectory = 0x0;
<a name="l00085"></a>00085 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *parentPageTable = 0x0, *newPageTable = 0x0;
<a name="l00086"></a>00086 <span class="keywordtype">int</span> x = 0;
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">/* Set Address Of Parent Page Directory */</span>
<a name="l00089"></a>00089 parentPageDirectory = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) <a class="code" href="paging_8h.html#aab3609eb02bd28ded8d1ea0512da979">parentPageDirAddr</a>;
<a name="l00090"></a>00090 <span class="comment">/* Allocate A New Page For The New Page Directory */</span>
<a name="l00091"></a>00091 newPageDirectory = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) <a class="code" href="paging_8h.html#d006a10f436671f8ee9cb402e372ff02">vmmGetFreePage</a>(pid);
<a name="l00092"></a>00092 <span class="comment">/* Set newPageDirectoryAddress To The Newly Created Page Directories Page */</span>
<a name="l00093"></a>00093 newPageDirectoryAddress = (<span class="keywordtype">void</span> *)<a class="code" href="paging_8h.html#e88bcfc69132a46a1982237913101a5b">vmm_getPhysicalAddr</a>((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageDirectory);
<a name="l00094"></a>00094 <span class="comment">/* First Set Up A Flushed Page Directory */</span>
<a name="l00095"></a>00095 <span class="keywordflow">for</span> (x = 0; x < <a class="code" href="paging_8h.html#b80d68a13753e40b0df8e0dc0c4af870">pageEntries</a>; x++) {
<a name="l00096"></a>00096 (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageDirectory[x] = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) 0x0;
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 <span class="comment">/* Map The Top 1GB Region Of The VM Space */</span>
<a name="l00099"></a>00099 <span class="keywordflow">for</span> (x = 768; x < pageEntries; x++) {
<a name="l00100"></a>00100 newPageDirectory[x] = parentPageDirectory[x];
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 <span class="comment">/*</span>
<a name="l00103"></a>00103 <span class="comment"> * Allocate A New Page For The The First Page Table Where We Will Map The</span>
<a name="l00104"></a>00104 <span class="comment"> * Lower Region</span>
<a name="l00105"></a>00105 <span class="comment"> */</span>
<a name="l00106"></a>00106 newPageTable = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) <a class="code" href="paging_8h.html#d006a10f436671f8ee9cb402e372ff02">vmmGetFreePage</a>(pid);
<a name="l00107"></a>00107 <span class="comment">/* Flush The Page From Garbage In Memory */</span>
<a name="l00108"></a>00108 <span class="keywordflow">for</span> (x = 0; x < pageEntries; x++) {
<a name="l00109"></a>00109 (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageTable[x] = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) 0x0;
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 <span class="comment">/* Map This Into The Page Directory */</span>
<a name="l00112"></a>00112 newPageDirectory[0] = (<a class="code" href="paging_8h.html#e88bcfc69132a46a1982237913101a5b">vmm_getPhysicalAddr</a>((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageTable) | <a class="code" href="paging_8h.html#f0fff7a38cd2c7a32d580787423b94ea">PAGE_DEFAULT</a>);
<a name="l00113"></a>00113 <span class="comment">/* Set Address Of Parents Page Table */</span>
<a name="l00114"></a>00114 parentPageTable = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) <a class="code" href="paging_8h.html#a432d41840ad8a583a7e6af86feece4f">tablesBaseAddress</a>;
<a name="l00115"></a>00115 <span class="comment">/* Map The First 1MB Worth Of Pages */</span>
<a name="l00116"></a>00116 <span class="keywordflow">for</span> (x = 0; x < (pageEntries / 4); x++) {
<a name="l00117"></a>00117 newPageTable[x] = parentPageTable[x];
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 <span class="comment">/* Set Virtual Mapping For Page Directory */</span>
<a name="l00120"></a>00120 newPageTable[256] = (<a class="code" href="paging_8h.html#e88bcfc69132a46a1982237913101a5b">vmm_getPhysicalAddr</a>((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageDirectory) | <a class="code" href="paging_8h.html#f0fff7a38cd2c7a32d580787423b94ea">PAGE_DEFAULT</a>);
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">/*</span>
<a name="l00123"></a>00123 <span class="comment"> * Now The Fun Stuff Build The Initial Virtual Page Space So We Don't Have</span>
<a name="l00124"></a>00124 <span class="comment"> * To Worry About Mapping Them In Later How Ever I'm Concerned This May</span>
<a name="l00125"></a>00125 <span class="comment"> * Become A Security Issue</span>
<a name="l00126"></a>00126 <span class="comment"> */</span>
<a name="l00127"></a>00127 <span class="comment">/* First Lets Unmap The Previously Allocated Page Table */</span>
<a name="l00128"></a>00128 <a class="code" href="paging_8h.html#fd94da50e455602f86ad7dae2fc9d1db">vmmUnmapPage</a>((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageTable, 1);
<a name="l00129"></a>00129 <span class="comment">/* Allocate A New Page Table */</span>
<a name="l00130"></a>00130 newPageTable = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) <a class="code" href="paging_8h.html#d006a10f436671f8ee9cb402e372ff02">vmmGetFreePage</a>(pid);
<a name="l00131"></a>00131 <span class="comment">/* First Set Our Page Directory To Contain This */</span>
<a name="l00132"></a>00132 newPageDirectory[767] = <a class="code" href="paging_8h.html#e88bcfc69132a46a1982237913101a5b">vmm_getPhysicalAddr</a>((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageTable) | <a class="code" href="paging_8h.html#f0fff7a38cd2c7a32d580787423b94ea">PAGE_DEFAULT</a>;
<a name="l00133"></a>00133 <span class="comment">/* Now Lets Build The Page Table */</span>
<a name="l00134"></a>00134 <span class="keywordflow">for</span> (x = 0; x < pageEntries; x++) {
<a name="l00135"></a>00135 newPageTable[x] = newPageDirectory[x];
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 <span class="comment">/* Now We Are Done So Lets Unmap This Page */</span>
<a name="l00138"></a>00138 <a class="code" href="paging_8h.html#fd94da50e455602f86ad7dae2fc9d1db">vmmUnmapPage</a>((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) newPageTable, 1);
<a name="l00139"></a>00139 <span class="comment">/* Now We Are Done With The Page Directory So Lets Unmap That Too */</span>
<a name="l00140"></a>00140 <a class="code" href="paging_8h.html#fd94da50e455602f86ad7dae2fc9d1db">vmmUnmapPage</a>((uInt32) newPageDirectory, 1);
<a name="l00141"></a>00141 <span class="comment">/* Return Physical Address Of Page Directory */</span>
<a name="l00142"></a>00142 <span class="keywordflow">return</span> (newPageDirectoryAddress);
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144
<a name="l00145"></a>00145 <span class="comment">/***</span>
<a name="l00146"></a>00146 <span class="comment"> END</span>
<a name="l00147"></a>00147 <span class="comment"> ***/</span>
<a name="l00148"></a>00148
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