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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>unmappage.c</h1><a href="unmappage_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) 2002-2004 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"> $Id: unmappage_8c-source.html 88 2016-01-12 00:11:29Z reddawg $</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">*****************************************************************************************/</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include <<a class="code" href="vmm_8h.html">vmm/vmm.h</a>></span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">/************************************************************************</span>
<a name="l00033"></a>00033 <span class="comment"></span>
<a name="l00034"></a>00034 <span class="comment">Function: void vmmUnmapPage(uInt32 pageAddr,int flags);</span>
<a name="l00035"></a>00035 <span class="comment">Description: This Function Will Unmap A Page From The Kernel VM Space</span>
<a name="l00036"></a>00036 <span class="comment"> The Flags Variable Decides If Its To Free The Page Or Not</span>
<a name="l00037"></a>00037 <span class="comment"> A Flag Of 0 Will Free It And A Flag Of 1 Will Keep It</span>
<a name="l00038"></a>00038 <span class="comment">Notes:</span>
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment">07/30/02 - I Have Decided That This Should Free The Physical Page There</span>
<a name="l00041"></a>00041 <span class="comment"> Is No Reason To Keep It Marked As Not Available</span>
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment">07/30/02 - Ok A Found A Reason To Keep It Marked As Available I Admit</span>
<a name="l00044"></a>00044 <span class="comment"> Even I Am Not Perfect Ok The Case Where You Wouldn't Want To</span>
<a name="l00045"></a>00045 <span class="comment"> Free It Would Be On Something Like Where I Allocated A Page</span>
<a name="l00046"></a>00046 <span class="comment"> To Create A New Virtual Space So Now It Has A Flag</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="keywordtype">void</span>
<a name="l00050"></a><a class="code" href="unmappage_8c.html#b0b3edc8b788e6418cc076ced9a19e74">00050</a> <a class="code" href="paging_8h.html#fd94da50e455602f86ad7dae2fc9d1db">vmmUnmapPage</a>(<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> pageAddr, <span class="keywordtype">int</span> flags)
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 <span class="keywordtype">int</span> pageDirectoryIndex = 0, pageTableIndex = 0;
<a name="l00053"></a>00053 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *pageTable = 0x0;
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">/* Get The Index To The Page Directory */</span>
<a name="l00056"></a>00056 pageDirectoryIndex = (pageAddr >> 22);
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">//Calculate The Page Table Index</span>
<a name="l00059"></a>00059 pageTableIndex = ((pageAddr >> 12) & 0x3FF);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">/* Set pageTable To The Virtual Address Of Table */</span>
<a name="l00062"></a>00062 pageTable = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) (<a class="code" href="paging_8h.html#a432d41840ad8a583a7e6af86feece4f">tablesBaseAddress</a> + (0<a class="code" href="ap-boot_8S.html#f78b91f02427adef14bb8b28aa93baa5">x1000</a> * pageDirectoryIndex));
<a name="l00063"></a>00063 <span class="comment">/* Free The Physical Page If Flags Is 0 */</span>
<a name="l00064"></a>00064 <span class="keywordflow">if</span> (flags == 0) {
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">/*</span>
<a name="l00067"></a>00067 <span class="comment"> * This is temp i think its still an issue clearVirtualPage(pageAddr);</span>
<a name="l00068"></a>00068 <span class="comment"> * freePage((uInt32)(pageTable[pageTableIndex] & 0xFFFFF000));</span>
<a name="l00069"></a>00069 <span class="comment"> */</span>
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071 <span class="comment">/* Unmap The Page */</span>
<a name="l00072"></a>00072 pageTable[pageTableIndex] = 0x0;
<a name="l00073"></a>00073 <span class="comment">/* Rehash The Page Directory */</span>
<a name="l00074"></a>00074 <span class="keyword">asm</span> <span class="keyword">volatile</span>(
<a name="l00075"></a>00075 <span class="stringliteral">"movl %cr3,%eax\n"</span>
<a name="l00076"></a>00076 <span class="stringliteral">"movl %eax,%cr3\n"</span>
<a name="l00077"></a>00077 );
<a name="l00078"></a>00078 <span class="comment">/* Return */</span>
<a name="l00079"></a>00079 <span class="keywordflow">return</span>;
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a>00082
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">/************************************************************************</span>
<a name="l00085"></a>00085 <span class="comment"></span>
<a name="l00086"></a>00086 <span class="comment">Function: void vmmUnmapPages(uInt32 pageAddr,int flags);</span>
<a name="l00087"></a>00087 <span class="comment">Description: This Function Will Unmap A Page From The Kernel VM Space</span>
<a name="l00088"></a>00088 <span class="comment"> The Flags Variable Decides If Its To Free The Page Or Not</span>
<a name="l00089"></a>00089 <span class="comment"> A Flag Of 0 Will Free It And A Flag Of 1 Will Keep It</span>
<a name="l00090"></a>00090 <span class="comment">Notes:</span>
<a name="l00091"></a>00091 <span class="comment"></span>
<a name="l00092"></a>00092 <span class="comment">07/30/02 - I Have Decided That This Should Free The Physical Page There</span>
<a name="l00093"></a>00093 <span class="comment"> Is No Reason To Keep It Marked As Not Available</span>
<a name="l00094"></a>00094 <span class="comment"></span>
<a name="l00095"></a>00095 <span class="comment">07/30/02 - Ok A Found A Reason To Keep It Marked As Available I Admit</span>
<a name="l00096"></a>00096 <span class="comment"> Even I Am Not Perfect Ok The Case Where You Wouldn't Want To</span>
<a name="l00097"></a>00097 <span class="comment"> Free It Would Be On Something Like Where I Allocated A Page</span>
<a name="l00098"></a>00098 <span class="comment"> To Create A New Virtual Space So Now It Has A Flag</span>
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment">************************************************************************/</span>
<a name="l00101"></a><a class="code" href="unmappage_8c.html#0a924a2db888f186cdcc7dc58add08f5">00101</a> <span class="keywordtype">void</span> <a class="code" href="paging_8h.html#0655b3d717666bf025c37fa55b588d37">vmmUnmapPages</a>(<span class="keywordtype">void</span> *ptr,<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> size) {
<a name="l00102"></a>00102 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> baseAddr = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>)ptr & 0xFFFFF000;
<a name="l00103"></a>00103 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> dI = 0x0,tI = 0x0;
<a name="l00104"></a>00104 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> y = 0x0;
<a name="l00105"></a>00105 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *pageTable = 0x0;
<a name="l00106"></a>00106
<a name="l00107"></a>00107 dI = (baseAddr/(1024*4096));
<a name="l00108"></a>00108 tI = ((baseAddr-(dI*(1024*4096)))/4096);
<a name="l00109"></a>00109 pageTable = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *)(<a class="code" href="paging_8h.html#a432d41840ad8a583a7e6af86feece4f">tablesBaseAddress</a> + (4096*dI));
<a name="l00110"></a>00110 <span class="keywordflow">for</span> (y=tI;y<(tI+((size+4095)/4096));y++) {
<a name="l00111"></a>00111 pageTable[y] = 0x0;
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113 <span class="keywordflow">return</span>;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115
<a name="l00116"></a>00116 <span class="comment">/***</span>
<a name="l00117"></a>00117 <span class="comment"> $Log: unmappage_8c-source.html,v $
<a name="l00117"></a>00117 <span class="comment"> Revision 1.7 2006/12/15 17:47:08 reddawg
<a name="l00117"></a>00117 <span class="comment"> Updates
<a name="l00117"></a>00117 <span class="comment"></span>
<a name="l00118"></a>00118 <span class="comment"> Revision 1.1.1.1 2006/06/01 12:46:13 reddawg</span>
<a name="l00119"></a>00119 <span class="comment"> ubix2</span>
<a name="l00120"></a>00120 <span class="comment"></span>
<a name="l00121"></a>00121 <span class="comment"> Revision 1.2 2005/10/12 00:13:38 reddawg</span>
<a name="l00122"></a>00122 <span class="comment"> Removed</span>
<a name="l00123"></a>00123 <span class="comment"></span>
<a name="l00124"></a>00124 <span class="comment"> Revision 1.1.1.1 2005/09/26 17:24:54 reddawg</span>
<a name="l00125"></a>00125 <span class="comment"> no message</span>
<a name="l00126"></a>00126 <span class="comment"></span>
<a name="l00127"></a>00127 <span class="comment"> Revision 1.4 2004/07/26 19:15:49 reddawg</span>
<a name="l00128"></a>00128 <span class="comment"> test code, fixes and the like</span>
<a name="l00129"></a>00129 <span class="comment"></span>
<a name="l00130"></a>00130 <span class="comment"> Revision 1.3 2004/06/15 12:35:05 reddawg</span>
<a name="l00131"></a>00131 <span class="comment"> Cleaned Up</span>
<a name="l00132"></a>00132 <span class="comment"></span>
<a name="l00133"></a>00133 <span class="comment"> Revision 1.2 2004/06/10 22:23:56 reddawg</span>
<a name="l00134"></a>00134 <span class="comment"> Volatiles</span>
<a name="l00135"></a>00135 <span class="comment"></span>
<a name="l00136"></a>00136 <span class="comment"> Revision 1.1.1.1 2004/04/15 12:06:53 reddawg</span>
<a name="l00137"></a>00137 <span class="comment"> UbixOS v1.0</span>
<a name="l00138"></a>00138 <span class="comment"></span>
<a name="l00139"></a>00139 <span class="comment"> Revision 1.7 2004/04/13 16:36:34 reddawg</span>
<a name="l00140"></a>00140 <span class="comment"> Changed our copyright, it is all now under a BSD-Style license</span>
<a name="l00141"></a>00141 <span class="comment"></span>
<a name="l00142"></a>00142 <span class="comment"> END</span>
<a name="l00143"></a>00143 <span class="comment"> ***/</span>
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