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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>vmm_memory.c</h1><a href="vmm__memory_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"> $Id$</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="io_8h.html">sys/io.h</a>></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include <<a class="code" href="kpanic_8h.html">ubixos/kpanic.h</a>></span>
<a name="l00033"></a>00033 <span class="preprocessor">#include <<a class="code" href="kprintf_8h.html">lib/kprintf.h</a>></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include <<a class="code" href="kmalloc_8h.html">lib/kmalloc.h</a>></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <<a class="code" href="kern__sysctl_8h.html">sys/kern_sysctl.h</a>></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <<a class="code" href="spinlock_8h.html">ubixos/spinlock.h</a>></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <<a class="code" href="assert_8h.html">assert.h</a>></span>
<a name="l00038"></a>00038
<a name="l00042"></a><a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">00042</a> <span class="keyword">static</span> <a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a> = 0;
<a name="l00043"></a><a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">00043</a> <span class="keyword">static</span> <a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> <a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">vmmSpinLock</a> = <a class="code" href="spinlock_8h.html#0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;
<a name="l00044"></a><a class="code" href="vmm__memory_8c.html#c13b9a55ec869479ab26ad9d949e6f85">00044</a> <span class="keyword">static</span> <a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> <a class="code" href="vmm__memory_8c.html#c13b9a55ec869479ab26ad9d949e6f85">vmmCowSpinLock</a> = <a class="code" href="spinlock_8h.html#0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;
<a name="l00045"></a>00045
<a name="l00046"></a>00046
<a name="l00047"></a><a class="code" href="vmm__memory_8c.html#2b0091bdc36e32af3daf9cfcaa7c04e1">00047</a> <span class="keywordtype">int</span> <a class="code" href="vmm_8h.html#2b0091bdc36e32af3daf9cfcaa7c04e1">numPages</a> = 0x0;
<a name="l00048"></a><a class="code" href="vmm__memory_8c.html#89e87741958ee81f1811075b25af058a">00048</a> <a class="code" href="structmMap.html">mMap</a> *<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a> = (<a class="code" href="structmMap.html">mMap</a> *) 0x101000;
<a name="l00049"></a>00049
<a name="l00050"></a>00050
<a name="l00060"></a><a class="code" href="vmm__memory_8c.html#0926a4c7f70e387891f6124a48258b64">00060</a> <span class="keywordtype">int</span> <a class="code" href="vmm_8h.html#0926a4c7f70e387891f6124a48258b64">vmmMemMapInit</a>() {
<a name="l00061"></a>00061 <span class="keywordtype">int</span> i = 0x0;
<a name="l00062"></a>00062 <span class="keywordtype">int</span> memStart = 0x0;
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="comment">/* Count System Memory */</span>
<a name="l00065"></a>00065 <a class="code" href="vmm_8h.html#2b0091bdc36e32af3daf9cfcaa7c04e1">numPages</a> = <a class="code" href="vmm_8h.html#1a89fbc2f80ca828332c5ef31801faa3">countMemory</a>();
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="comment">/* Set Memory Map To Point To First Physical Page That We Will Use */</span>
<a name="l00068"></a>00068 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a> = (<a class="code" href="structmMap.html">mMap</a> *) 0x101000;
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">/* Initialize Map Make All Pages Not Available */</span>
<a name="l00071"></a>00071 <span class="keywordflow">for</span> (i = 0x0; i < <a class="code" href="vmm_8h.html#2b0091bdc36e32af3daf9cfcaa7c04e1">numPages</a>; i++) {
<a name="l00072"></a>00072 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].cowCounter = 0x0;
<a name="l00073"></a>00073 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="structmMap.html#cce32b3022c0d0fbed2760ecc118f664">status</a> = <a class="code" href="vmm_8h.html#41dc1abc6436bd66a4269de8ab471181">memNotavail</a>;
<a name="l00074"></a>00074 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="structmMap.html#d72d5f52b2195f98e60aa61ed52ae9b1">pid</a> = <a class="code" href="vmm_8h.html#e6c443b60824c02f199f51cf4a14e9f4">vmmID</a>;
<a name="l00075"></a>00075 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="structmMap.html#c8d077d6fec5b5f9a63f01f044444f2b">pageAddr</a> = i * 4096;
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="comment">/* Calculate Start Of Free Memory */</span>
<a name="l00079"></a>00079 memStart = (0x101000 / 0x1000);
<a name="l00080"></a>00080 memStart += (((<span class="keyword">sizeof</span>(<a class="code" href="structmMap.html">mMap</a>) * numPages) + (<span class="keyword">sizeof</span>(<a class="code" href="structmMap.html">mMap</a>) - 1)) / 0<a class="code" href="ap-boot_8S.html#f78b91f02427adef14bb8b28aa93baa5">x1000</a>);
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="comment">/* Initialize All Free Pages To Available */</span>
<a name="l00083"></a>00083 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[(0x100000 / 0x1000)].<a class="code" href="fdc_8c.html#e2746d1bf47d4f690105d083b966fa82">status</a> = <a class="code" href="vmm_8h.html#b75ffaa83e1dc903d97c411c84dfec0f">memAvail</a>;
<a name="l00084"></a>00084 <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>++;
<a name="l00085"></a>00085 <span class="keywordflow">for</span> (i = memStart; i < numPages; i++) {
<a name="l00086"></a>00086 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="fdc_8c.html#e2746d1bf47d4f690105d083b966fa82">status</a> = <a class="code" href="vmm_8h.html#b75ffaa83e1dc903d97c411c84dfec0f">memAvail</a>;
<a name="l00087"></a>00087 freePages++;
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="comment">/* Print Out Amount Of Memory */</span>
<a name="l00091"></a>00091 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Real Memory: %iKB\n"</span>, numPages * 4);
<a name="l00092"></a>00092 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Available Memory: %iKB\n"</span>, freePages * 4);
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="comment">/* Return */</span>
<a name="l00095"></a>00095 <span class="keywordflow">return</span> (0);
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097
<a name="l00107"></a><a class="code" href="vmm__memory_8c.html#1a89fbc2f80ca828332c5ef31801faa3">00107</a> <span class="keywordtype">int</span> <a class="code" href="vmm_8h.html#1a89fbc2f80ca828332c5ef31801faa3">countMemory</a>() {
<a name="l00108"></a>00108 <span class="keyword">register</span> <a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *mem = 0x0;
<a name="l00109"></a>00109 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> memCount = -1, tempMemory = 0x0;
<a name="l00110"></a>00110 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> memKb = 0;
<a name="l00111"></a>00111 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> irq1State, irq2State;
<a name="l00112"></a>00112 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="ap-boot_8S.html#55b794ab80e3855b3bd9c5e48621624f">cr0</a> = 0x0;
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="comment">/*</span>
<a name="l00115"></a>00115 <span class="comment"> * Save The States Of Both IRQ 1 And 2 So We Can Turn Them Off And Restore</span>
<a name="l00116"></a>00116 <span class="comment"> * Them Later</span>
<a name="l00117"></a>00117 <span class="comment"> */</span>
<a name="l00118"></a>00118 irq1State = <a class="code" href="io_8h.html#77b934268de1b3ecdcf3f275413b3108">inportByte</a>(0x21);
<a name="l00119"></a>00119 irq2State = <a class="code" href="io_8h.html#77b934268de1b3ecdcf3f275413b3108">inportByte</a>(0xA1);
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="comment">/* Turn Off IRQ 1 And 2 To Prevent Chances Of Faults While Examining Memory */</span>
<a name="l00122"></a>00122 <a class="code" href="io_8h.html#8acc1a06073db2e7b92ffbd00fbd0cf1">outportByte</a>(0x21, 0xFF);
<a name="l00123"></a>00123 <a class="code" href="io_8h.html#8acc1a06073db2e7b92ffbd00fbd0cf1">outportByte</a>(0xA1, 0xFF);
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">/* Save The State Of Register CR0 */</span>
<a name="l00126"></a>00126 <span class="keyword">asm</span> <span class="keyword">volatile</span> (
<a name="l00127"></a>00127 <span class="stringliteral">"movl %%cr0, %%ebx\n"</span>
<a name="l00128"></a>00128 : <span class="stringliteral">"=a"</span> (cr0)
<a name="l00129"></a>00129 :
<a name="l00130"></a>00130 : <span class="stringliteral">"ebx"</span>
<a name="l00131"></a>00131 );
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"wbinvd"</span>);
<a name="l00134"></a>00134 <span class="keyword">asm</span> <span class="keyword">volatile</span> (
<a name="l00135"></a>00135 <span class="stringliteral">"movl %%ebx, %%cr0\n"</span>
<a name="l00136"></a>00136 :
<a name="l00137"></a>00137 : <span class="stringliteral">"a"</span> (cr0 | 0x00000001 | 0x40000000 | 0x20000000)
<a name="l00138"></a>00138 : <span class="stringliteral">"ebx"</span>
<a name="l00139"></a>00139 );
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keywordflow">while</span> (memKb < 4096 && memCount != 0) {
<a name="l00142"></a>00142 memKb++;
<a name="l00143"></a>00143 <span class="keywordflow">if</span> (memCount == -1)
<a name="l00144"></a>00144 memCount = 0;
<a name="l00145"></a>00145 memCount += 1024 * 1024;
<a name="l00146"></a>00146 mem = (<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *)memCount;
<a name="l00147"></a>00147 tempMemory = *mem;
<a name="l00148"></a>00148 *mem = 0x55AA55AA;
<a name="l00149"></a>00149 <span class="keyword">asm</span>(<span class="stringliteral">""</span>: : :<span class="stringliteral">"memory"</span>);
<a name="l00150"></a>00150 <span class="keywordflow">if</span> (*mem != 0x55AA55AA) {
<a name="l00151"></a>00151 memCount = 0;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 <span class="keywordflow">else</span> {
<a name="l00154"></a>00154 *mem = 0xAA55AA55;
<a name="l00155"></a>00155 <span class="keyword">asm</span>(<span class="stringliteral">""</span>: : :<span class="stringliteral">"memory"</span>);
<a name="l00156"></a>00156 <span class="keywordflow">if</span> (*mem != 0xAA55AA55) {
<a name="l00157"></a>00157 memCount = 0;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 <span class="keyword">asm</span>(<span class="stringliteral">""</span>: : :<span class="stringliteral">"memory"</span>);
<a name="l00161"></a>00161 *mem = tempMemory;
<a name="l00162"></a>00162 }
<a name="l00163"></a>00163
<a name="l00164"></a>00164 <span class="keyword">asm</span> <span class="keyword">volatile</span> (
<a name="l00165"></a>00165 <span class="stringliteral">"movl %%ebx, %%cr0\n"</span>
<a name="l00166"></a>00166 :
<a name="l00167"></a>00167 : <span class="stringliteral">"a"</span> (cr0)
<a name="l00168"></a>00168 : <span class="stringliteral">"ebx"</span>
<a name="l00169"></a>00169 );
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="comment">/* Restore States For Both IRQ 1 And 2 */</span>
<a name="l00172"></a>00172 <a class="code" href="io_8h.html#8acc1a06073db2e7b92ffbd00fbd0cf1">outportByte</a>(0x21, irq1State);
<a name="l00173"></a>00173 <a class="code" href="io_8h.html#8acc1a06073db2e7b92ffbd00fbd0cf1">outportByte</a>(0xA1, irq2State);
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="comment">/* Return Amount Of Memory In Pages */</span>
<a name="l00176"></a>00176 <span class="keywordflow">return</span> ((memKb * 1024 * 1024) / 4096);
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178
<a name="l00189"></a><a class="code" href="vmm__memory_8c.html#1be09ae74f7f41cd765042a0a7411c49">00189</a> <a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> <a class="code" href="vmm_8h.html#976cf3919bf7c77c868021ec9374593b">vmmFindFreePage</a>(<a class="code" href="include_2ubixos_2types_8h.html#e438ba74394b14d7b24b6df3b3b8c252">pidType</a> pid) {
<a name="l00190"></a>00190 <span class="keywordtype">int</span> i = 0x0;
<a name="l00191"></a>00191
<a name="l00192"></a>00192 <span class="comment">/* Lets Look For A Free Page */</span>
<a name="l00193"></a>00193 <span class="keywordflow">if</span> (pid < <a class="code" href="kmalloc_8h.html#81d09bc848b49133401b3efeeb65f1af">sysID</a>)
<a name="l00194"></a>00194 <a class="code" href="kpanic_8h.html#db9a182aa071791a306163d50d653deb">kpanic</a>(<span class="stringliteral">"Error: invalid PID %i\n"</span>,pid);
<a name="l00195"></a>00195
<a name="l00196"></a>00196 <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(&<a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">vmmSpinLock</a>);
<a name="l00197"></a>00197
<a name="l00198"></a>00198 <span class="keywordflow">for</span> (i = 0; i <= <a class="code" href="vmm_8h.html#2b0091bdc36e32af3daf9cfcaa7c04e1">numPages</a>; i++) {
<a name="l00199"></a>00199
<a name="l00200"></a>00200 <span class="comment">/*</span>
<a name="l00201"></a>00201 <span class="comment"> * If We Found A Free Page Set It To Not Available After That Set Its Own</span>
<a name="l00202"></a>00202 <span class="comment"> * And Return The Address</span>
<a name="l00203"></a>00203 <span class="comment"> */</span>
<a name="l00204"></a>00204 <span class="keywordflow">if</span> ((<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="fdc_8c.html#e2746d1bf47d4f690105d083b966fa82">status</a> == <a class="code" href="vmm_8h.html#b75ffaa83e1dc903d97c411c84dfec0f">memAvail</a>) && (<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].cowCounter == 0)) {
<a name="l00205"></a>00205 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="fdc_8c.html#e2746d1bf47d4f690105d083b966fa82">status</a> = <a class="code" href="vmm_8h.html#41dc1abc6436bd66a4269de8ab471181">memNotavail</a>;
<a name="l00206"></a>00206 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="structmMap.html#d72d5f52b2195f98e60aa61ed52ae9b1">pid</a> = pid;
<a name="l00207"></a>00207 <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>--;
<a name="l00208"></a>00208 <span class="keywordflow">if</span> (<a class="code" href="kern__sysctl_8c.html#712de03282020240591c73cd2432c2da">sysctl_enabled</a> == <a class="code" href="include_2ubixos_2types_8h.html#f6a258d8f3ee5206d682d799316314b1a82764c3079aea4e60c80e45befbb839">TRUE</a>) {
<a name="l00209"></a>00209 <a class="code" href="timer_8S.html#dc95ab102f418b6c76681c5f12dcbaf6">systemVitals</a>->freePages = <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>;
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">vmmSpinLock</a>);
<a name="l00213"></a>00213 <span class="keywordflow">return</span> (<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].pageAddr);
<a name="l00214"></a>00214 }
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216
<a name="l00217"></a>00217 <span class="comment">/* If No Free Memory Is Found Return NULL */</span>
<a name="l00218"></a>00218 <a class="code" href="kpanic_8h.html#db9a182aa071791a306163d50d653deb">kpanic</a>(<span class="stringliteral">"Out Of Memory!!!!"</span>);
<a name="l00219"></a>00219 <span class="keywordflow">return</span> (0x0);
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221
<a name="l00222"></a>00222
<a name="l00232"></a><a class="code" href="vmm__memory_8c.html#e90be267d851fed04d4d9b1c6c10454a">00232</a> <span class="keywordtype">int</span> <a class="code" href="vmm_8h.html#e90be267d851fed04d4d9b1c6c10454a">freePage</a>(<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> pageAddr) {
<a name="l00233"></a>00233 <span class="keywordtype">int</span> pageIndex = 0x0;
<a name="l00234"></a>00234 <a class="code" href="assert_8h.html#d6d5aaa966ca7424f7cb9bd01f2c838b">assert</a>((pageAddr & 0xFFF) == 0x0);
<a name="l00235"></a>00235 <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(&<a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">vmmSpinLock</a>);
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="comment">/* Find The Page Index To The Memory Map */</span>
<a name="l00238"></a>00238 pageIndex = (pageAddr / 4096);
<a name="l00239"></a>00239
<a name="l00240"></a>00240 <span class="comment">/* Check If Page COW Is Greater Then 0 If It Is Dec It If Not Free It */</span>
<a name="l00241"></a>00241 <span class="keywordflow">if</span> (<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[pageIndex].cowCounter == 0) {
<a name="l00242"></a>00242 <span class="comment">/* Set Page As Avail So It Can Be Used Again */</span>
<a name="l00243"></a>00243 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[pageIndex].<a class="code" href="structmMap.html#cce32b3022c0d0fbed2760ecc118f664">status</a> = <a class="code" href="vmm_8h.html#b75ffaa83e1dc903d97c411c84dfec0f">memAvail</a>;
<a name="l00244"></a>00244 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[pageIndex].<a class="code" href="structmMap.html#2fb919d9c0a2653979ed667d59a395cb">cowCounter</a> = 0x0;
<a name="l00245"></a>00245 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[pageIndex].<a class="code" href="structmMap.html#d72d5f52b2195f98e60aa61ed52ae9b1">pid</a> = -2;
<a name="l00246"></a>00246 <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>++;
<a name="l00247"></a>00247 <a class="code" href="timer_8S.html#dc95ab102f418b6c76681c5f12dcbaf6">systemVitals</a>->freePages = <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>;
<a name="l00248"></a>00248 }
<a name="l00249"></a>00249 <span class="keywordflow">else</span> {
<a name="l00250"></a>00250 <span class="comment">/* Adjust The COW Counter */</span>
<a name="l00251"></a>00251 <a class="code" href="vmm_8h.html#362d462b3a1e19b5e0ef95e1839dbf11">adjustCowCounter</a>(((<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>) <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[pageIndex].pageAddr), -1);
<a name="l00252"></a>00252 }
<a name="l00253"></a>00253 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">vmmSpinLock</a>);
<a name="l00254"></a>00254 <span class="comment">/* Return */</span>
<a name="l00255"></a>00255 <span class="keywordflow">return</span> (0);
<a name="l00256"></a>00256 }
<a name="l00257"></a>00257
<a name="l00270"></a><a class="code" href="vmm__memory_8c.html#362d462b3a1e19b5e0ef95e1839dbf11">00270</a> <span class="keywordtype">int</span> <a class="code" href="vmm_8h.html#362d462b3a1e19b5e0ef95e1839dbf11">adjustCowCounter</a>(<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> baseAddr, <span class="keywordtype">int</span> adjustment) {
<a name="l00271"></a>00271 <span class="keywordtype">int</span> vmmMemoryMapIndex = (baseAddr / 4096);
<a name="l00272"></a>00272 <a class="code" href="assert_8h.html#d6d5aaa966ca7424f7cb9bd01f2c838b">assert</a>((baseAddr & 0xFFF) == 0x0);
<a name="l00273"></a>00273 <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(&<a class="code" href="vmm__memory_8c.html#c13b9a55ec869479ab26ad9d949e6f85">vmmCowSpinLock</a>);
<a name="l00274"></a>00274 <span class="comment">/* Adjust COW Counter */</span>
<a name="l00275"></a>00275 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[vmmMemoryMapIndex].<a class="code" href="structmMap.html#2fb919d9c0a2653979ed667d59a395cb">cowCounter</a> += adjustment;
<a name="l00276"></a>00276
<a name="l00277"></a>00277 <span class="keywordflow">if</span> (<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[vmmMemoryMapIndex].cowCounter == 0) {
<a name="l00278"></a>00278 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[vmmMemoryMapIndex].<a class="code" href="structmMap.html#2fb919d9c0a2653979ed667d59a395cb">cowCounter</a> = 0x0;
<a name="l00279"></a>00279 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[vmmMemoryMapIndex].<a class="code" href="structmMap.html#d72d5f52b2195f98e60aa61ed52ae9b1">pid</a> = <a class="code" href="vmm_8h.html#e6c443b60824c02f199f51cf4a14e9f4">vmmID</a>;
<a name="l00280"></a>00280 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[vmmMemoryMapIndex].<a class="code" href="structmMap.html#cce32b3022c0d0fbed2760ecc118f664">status</a> = <a class="code" href="vmm_8h.html#b75ffaa83e1dc903d97c411c84dfec0f">memAvail</a>;
<a name="l00281"></a>00281 <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>++;
<a name="l00282"></a>00282 <a class="code" href="timer_8S.html#dc95ab102f418b6c76681c5f12dcbaf6">systemVitals</a>->freePages = <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>;
<a name="l00283"></a>00283 }
<a name="l00284"></a>00284 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="vmm__memory_8c.html#c13b9a55ec869479ab26ad9d949e6f85">vmmCowSpinLock</a>);
<a name="l00285"></a>00285 <span class="comment">/* Return */</span>
<a name="l00286"></a>00286 <span class="keywordflow">return</span> (0);
<a name="l00287"></a>00287 }
<a name="l00288"></a>00288
<a name="l00300"></a><a class="code" href="vmm__memory_8c.html#a24b696e386ef97dfe88b9b434c671c6">00300</a> <span class="keywordtype">void</span> <a class="code" href="vmm_8h.html#a24b696e386ef97dfe88b9b434c671c6">vmmFreeProcessPages</a>(<a class="code" href="include_2ubixos_2types_8h.html#e438ba74394b14d7b24b6df3b3b8c252">pidType</a> pid) {
<a name="l00301"></a>00301 <span class="keywordtype">int</span> i=0,x=0;
<a name="l00302"></a>00302 <a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *tmpPageTable = 0x0;
<a name="l00303"></a>00303 <a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *tmpPageDir = (<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *)<a class="code" href="paging_8h.html#aab3609eb02bd28ded8d1ea0512da979">parentPageDirAddr</a>;
<a name="l00304"></a>00304 <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(&<a class="code" href="vmm__memory_8c.html#ee00a539cbe4cc341553ee44f318157a">vmmSpinLock</a>);
<a name="l00305"></a>00305 <span class="comment">/* Check Page Directory For An Avail Page Table */</span>
<a name="l00306"></a>00306 <span class="keywordflow">for</span> (i=0;i<=0x300;i++) {
<a name="l00307"></a>00307 <span class="keywordflow">if</span> (tmpPageDir[i] != 0) {
<a name="l00308"></a>00308 <span class="comment">/* Set Up Page Table Pointer */</span>
<a name="l00309"></a>00309 tmpPageTable = (<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *)(<a class="code" href="paging_8h.html#a432d41840ad8a583a7e6af86feece4f">tablesBaseAddress</a> + (i * 0<a class="code" href="ap-boot_8S.html#f78b91f02427adef14bb8b28aa93baa5">x1000</a>));
<a name="l00310"></a>00310 <span class="comment">/* Check The Page Table For COW Pages */</span>
<a name="l00311"></a>00311 <span class="keywordflow">for</span> (x=0;x<<a class="code" href="paging_8h.html#b80d68a13753e40b0df8e0dc0c4af870">pageEntries</a>;x++) {
<a name="l00312"></a>00312 <span class="comment">/* If The Page Is COW Adjust COW Counter */</span>
<a name="l00313"></a>00313 <span class="keywordflow">if</span> (((<a class="code" href="include_2ubixos_2types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>)tmpPageTable[x] & <a class="code" href="paging_8h.html#57d743cb60fe478f6720c42315e7e813">PAGE_COW</a>) == PAGE_COW) {
<a name="l00314"></a>00314 <a class="code" href="vmm_8h.html#362d462b3a1e19b5e0ef95e1839dbf11">adjustCowCounter</a>(((uInt32)tmpPageTable[x] & 0xFFFFF000),-1);
<a name="l00315"></a>00315 }
<a name="l00316"></a>00316 }
<a name="l00317"></a>00317 }
<a name="l00318"></a>00318 }
<a name="l00319"></a>00319
<a name="l00320"></a>00320 <span class="comment">/* Loop Through Pages To Find Pages Owned By Process */</span>
<a name="l00321"></a>00321 <span class="keywordflow">for</span> (i=0;i<<a class="code" href="vmm_8h.html#2b0091bdc36e32af3daf9cfcaa7c04e1">numPages</a>;i++) {
<a name="l00322"></a>00322 <span class="keywordflow">if</span> (<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].pid == pid) {
<a name="l00323"></a>00323 <span class="comment">/* Check To See If The cowCounter Is Zero If So We Can Ree It */</span>
<a name="l00324"></a>00324 <span class="keywordflow">if</span> (<a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].cowCounter == 0) {
<a name="l00325"></a>00325 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="fdc_8c.html#e2746d1bf47d4f690105d083b966fa82">status</a> = <a class="code" href="vmm_8h.html#b75ffaa83e1dc903d97c411c84dfec0f">memAvail</a>;
<a name="l00326"></a>00326 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="structmMap.html#2fb919d9c0a2653979ed667d59a395cb">cowCounter</a> = 0x0;
<a name="l00327"></a>00327 <a class="code" href="vmm_8h.html#89e87741958ee81f1811075b25af058a">vmmMemoryMap</a>[i].<a class="code" href="structmMap.html#d72d5f52b2195f98e60aa61ed52ae9b1">pid</a> = <a class="code" href="vmm_8h.html#e6c443b60824c02f199f51cf4a14e9f4">vmmID</a>;
<a name="l00328"></a>00328 <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>++;
<a name="l00329"></a>00329 <a class="code" href="timer_8S.html#dc95ab102f418b6c76681c5f12dcbaf6">systemVitals</a>->freePages = <a class="code" href="vmm__memory_8c.html#0e1198ffc77f9177e36e61b72daf3cdc">freePages</a>;
<a name="l00330"></a>00330 }
<a name="l00331"></a>00331 }
<a name="l00332"></a>00332 }
<a name="l00333"></a>00333 <span class="comment">/* Return */</span>
<a name="l00334"></a>00334 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&vmmSpinLock);
<a name="l00335"></a>00335 <span class="keywordflow">return</span>;
<a name="l00336"></a>00336 }
<a name="l00337"></a>00337
<a name="l00338"></a>00338 <span class="comment">/***</span>
<a name="l00339"></a>00339 <span class="comment"> END</span>
<a name="l00340"></a>00340 <span class="comment"> ***/</span>
<a name="l00341"></a>00341
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Dec 3 02:38:05 2006 for UbixOS V2 by
<a href="http://www.doxygen.org/index.html">
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