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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>getfreepage.c</h1><a href="getfreepage_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"> $Id: getfreepage_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 <span class="preprocessor">#include <<a class="code" href="kpanic_8h.html">ubixos/kpanic.h</a>></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include <<a class="code" href="spinlock_8h.html">ubixos/spinlock.h</a>></span>
<a name="l00033"></a>00033
<a name="l00034"></a><a class="code" href="getfreepage_8c.html#ebc7aa9c5f3b171c3e2660c4f102b248">00034</a> <span class="keyword">static</span> <a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> <a class="code" href="getfreepage_8c.html#ebc7aa9c5f3b171c3e2660c4f102b248">vmmGFPlock</a> = <a class="code" href="spinlock_8h.html#0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="comment">/************************************************************************</span>
<a name="l00037"></a>00037 <span class="comment"></span>
<a name="l00038"></a>00038 <span class="comment">Function: void *vmmGetFreePage(pidType pid);</span>
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment">Description: Returns A Free Page Mapped To The VM Space</span>
<a name="l00041"></a>00041 <span class="comment"></span>
<a name="l00042"></a>00042 <span class="comment">Notes:</span>
<a name="l00043"></a>00043 <span class="comment"></span>
<a name="l00044"></a>00044 <span class="comment">07/30/02 - This Returns A Free Page In The Top 1GB For The Kernel</span>
<a name="l00045"></a>00045 <span class="comment"></span>
<a name="l00046"></a>00046 <span class="comment">************************************************************************/</span>
<a name="l00047"></a>00047 <span class="keywordtype">void</span> *
<a name="l00048"></a><a class="code" href="getfreepage_8c.html#97b73a5761e664ab5c0c24382971a2e6">00048</a> <a class="code" href="paging_8h.html#d006a10f436671f8ee9cb402e372ff02">vmmGetFreePage</a>(<a class="code" href="types_8h.html#e438ba74394b14d7b24b6df3b3b8c252">pidType</a> pid)
<a name="l00049"></a>00049 {
<a name="l00050"></a>00050 <a class="code" href="types_8h.html#3b65128d2644e9b80cec9a69bfa7e094">uInt16</a> x = 0x0, y = 0x0;
<a name="l00051"></a>00051 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *pageTableSrc = 0x0;
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(&<a class="code" href="getfreepage_8c.html#ebc7aa9c5f3b171c3e2660c4f102b248">vmmGFPlock</a>);
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">/* Lets Search For A Free Page */</span>
<a name="l00056"></a>00056 <span class="keywordflow">for</span> (x = 768; x < 1024; x++) {
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">/* Set Page Table Address */</span>
<a name="l00059"></a>00059 pageTableSrc = (<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> * x));
<a name="l00060"></a>00060 <span class="keywordflow">for</span> (y = 0x0; y < 1024; y++) {
<a name="l00061"></a>00061 <span class="comment">/* Loop Through The Page Table Find An UnAllocated Page */</span>
<a name="l00062"></a>00062 <span class="keywordflow">if</span> ((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) pageTableSrc[y] == (uInt32) 0x0) {
<a name="l00063"></a>00063 <span class="comment">/* Map A Physical Page To The Virtual Page */</span>
<a name="l00064"></a>00064 <span class="keywordflow">if</span> ((<a class="code" href="paging_8h.html#a05f8d8947fb5bcec87fc6661f83243e">vmm_remapPage</a>(<a class="code" href="vmm_8h.html#976cf3919bf7c77c868021ec9374593b">vmmFindFreePage</a>(pid), ((x * 0x400000) + (y * 0<a class="code" href="ap-boot_8S.html#f78b91f02427adef14bb8b28aa93baa5">x1000</a>)),<a class="code" href="paging_8h.html#8b838cda4f0bc79ab8d07eb19dd35420">KERNEL_PAGE_DEFAULT</a>)) == 0x0)
<a name="l00065"></a>00065 <a class="code" href="kpanic_8h.html#db9a182aa071791a306163d50d653deb">kpanic</a>(<span class="stringliteral">"vmmRemapPage: vmmGetFreePage\n"</span>);
<a name="l00066"></a>00066 <span class="comment">/* Clear This Page So No Garbage Is There */</span>
<a name="l00067"></a>00067 <a class="code" href="paging_8h.html#230a160ddb717c5a133e55aa42e9d324">vmmClearVirtualPage</a>((uInt32) ((x * 0x400000) + (y * 0x1000)));
<a name="l00068"></a>00068 <span class="comment">/* Return The Address Of The Newly Allocate Page */</span>
<a name="l00069"></a>00069 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="getfreepage_8c.html#ebc7aa9c5f3b171c3e2660c4f102b248">vmmGFPlock</a>);
<a name="l00070"></a>00070 <span class="keywordflow">return</span> ((<span class="keywordtype">void</span> *)((x * 0x400000) + (y * 0x1000)));
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074 <span class="comment">/* If No Free Page Was Found Return NULL */</span>
<a name="l00075"></a>00075 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="getfreepage_8c.html#ebc7aa9c5f3b171c3e2660c4f102b248">vmmGFPlock</a>);
<a name="l00076"></a>00076 <span class="keywordflow">return</span> (0x0);
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="comment">/***</span>
<a name="l00080"></a>00080 <span class="comment"> END</span>
<a name="l00081"></a>00081 <span class="comment"> ***/</span>
<a name="l00082"></a>00082
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Fri Dec 15 11:18:55 2006 for UbixOS V2 by
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