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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>pagefault.c</h1><a href="pagefault_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: pagefault_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="sched_8h.html">ubixos/sched.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="spinlock_8h.html">ubixos/spinlock.h</a>></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include <<a class="code" href="kprintf_8h.html">lib/kprintf.h</a>></span>
<a name="l00035"></a>00035
<a name="l00036"></a><a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">00036</a> <span class="keyword">static</span> <a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> <a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a> = <a class="code" href="spinlock_8h.html#0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="comment">/*****************************************************************************************</span>
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment"> Function: void vmm_pageFault(uInt32 memAddr,uInt32 eip,uInt32 esp);</span>
<a name="l00041"></a>00041 <span class="comment"> Description: This is the page fault handler, it will handle COW and trap all other</span>
<a name="l00042"></a>00042 <span class="comment"> exceptions and segfault the thread.</span>
<a name="l00043"></a>00043 <span class="comment"></span>
<a name="l00044"></a>00044 <span class="comment"> Notes:</span>
<a name="l00045"></a>00045 <span class="comment"> </span>
<a name="l00046"></a>00046 <span class="comment">07/30/02 - Fixed COW However I Need To Think Of A Way To Impliment</span>
<a name="l00047"></a>00047 <span class="comment"> A Paging System Also Start To Add Security Levels</span>
<a name="l00048"></a>00048 <span class="comment"> </span>
<a name="l00049"></a>00049 <span class="comment">07/27/04 - Added spin locking to ensure that we are thread safe. I know that spining a </span>
<a name="l00050"></a>00050 <span class="comment"> cpu is a waste of resources but for now it prevents errors.</span>
<a name="l00051"></a>00051 <span class="comment"></span>
<a name="l00052"></a>00052 <span class="comment">*****************************************************************************************/</span>
<a name="l00053"></a><a class="code" href="pagefault_8c.html#38aaad80f8ef516de9fe963e677fe273">00053</a> <span class="keywordtype">void</span> <a class="code" href="paging_8h.html#442adfc886cbfedfc3edadf45c5f89a6">vmm_pageFault</a>(<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> memAddr,<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> eip,<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> <a class="code" href="start_8S.html#00530026cdfd3cedfaee7ac4ec46aa53">esp</a>) {
<a name="l00054"></a>00054 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> i = 0x0, pageTableIndex = 0x0,pageDirectoryIndex = 0x0;
<a name="l00055"></a>00055 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *pageDir = 0x0,*pageTable = 0x0;
<a name="l00056"></a>00056 <a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *src = 0x0,*dst = 0x0;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">/* Try to aquire lock otherwise spin till we do */</span>
<a name="l00059"></a>00059 <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(&<a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a>);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">/* Set page dir pointer to the address of the visable page directory */</span>
<a name="l00062"></a>00062 pageDir = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *)<a class="code" href="paging_8h.html#aab3609eb02bd28ded8d1ea0512da979">parentPageDirAddr</a>;
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="comment">/* UBU - This is a temp panic for 0x0 read write later on I will handle this differently */</span>
<a name="l00065"></a>00065 <span class="keywordflow">if</span> (memAddr == 0x0) {
<a name="l00066"></a>00066 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Segfault At Address: [0x%X][0x%X][%i][0x%X]\n"</span>,memAddr,esp,<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>,eip);
<a name="l00067"></a>00067 <a class="code" href="kpanic_8h.html#db9a182aa071791a306163d50d653deb">kpanic</a>(<span class="stringliteral">"Error We Wrote To 0x0\n"</span>);
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">/* Calculate The Page Directory Index */</span>
<a name="l00071"></a>00071 pageDirectoryIndex = (memAddr >> 22);
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="comment">/* Calculate The Page Table Index */</span>
<a name="l00074"></a>00074 pageTableIndex = ((memAddr >> 12) & 0x3FF);
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">/* UBU - This is a temporary routine for handling access to a page of a non existant page table */</span>
<a name="l00077"></a>00077 <span class="keywordflow">if</span> (pageDir[pageDirectoryIndex] == 0x0) {
<a name="l00078"></a>00078 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Segfault At Address: [0x%X][0x%X][%i][0x%X], Not A Valid Page Table\n"</span>,memAddr,esp,<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>,eip);
<a name="l00079"></a>00079 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a>);
<a name="l00080"></a>00080 <a class="code" href="endtask_8h.html#152c1859ada097cc21071f471bfa2e67">endTask</a>(<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>);
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082 <span class="keywordflow">else</span> {
<a name="l00083"></a>00083 <span class="comment">/* Set pageTable To Point To Virtual Address Of Page Table */</span>
<a name="l00084"></a>00084 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="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">/* Test if this is a COW on page */</span>
<a name="l00087"></a>00087 <span class="keywordflow">if</span> (((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>)pageTable[pageTableIndex] & <a class="code" href="paging_8h.html#57d743cb60fe478f6720c42315e7e813">PAGE_COW</a>) == PAGE_COW) {
<a name="l00088"></a>00088 <span class="comment">/* Set Src To Base Address Of Page To Copy */</span>
<a name="l00089"></a>00089 src = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *)(memAddr & 0xFFFFF000);
<a name="l00090"></a>00090 <span class="comment">/* Allocate A Free Page For Destination */</span>
<a name="l00091"></a>00091 <span class="comment">/* USE vmInfo */</span>
<a name="l00092"></a>00092 dst = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a> *) <a class="code" href="paging_8h.html#4b324672c4b25064eb8db1e3419337b1">vmmGetFreeVirtualPage</a>(<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>,1,0<a class="code" href="ap-boot_8S.html#1a3ac2137e21f6f0d400f1996914dd19">x1</a>);
<a name="l00093"></a>00093 <span class="comment">/* Copy Memory */</span>
<a name="l00094"></a>00094 <span class="keywordflow">for</span> (i=0;i<<a class="code" href="paging_8h.html#b80d68a13753e40b0df8e0dc0c4af870">pageEntries</a>;i++) {
<a name="l00095"></a>00095 dst[i] = src[i];
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 <span class="comment">/* Adjust The COW Counter For Physical Page */</span>
<a name="l00098"></a>00098 <a class="code" href="vmm_8h.html#362d462b3a1e19b5e0ef95e1839dbf11">adjustCowCounter</a>(((<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>)pageTable[pageTableIndex] & 0xFFFFF000),-1);
<a name="l00099"></a>00099 <span class="comment">/* Remap In New Page */</span>
<a name="l00100"></a>00100 pageTable[pageTableIndex] = (uInt32)(<a class="code" href="paging_8h.html#e88bcfc69132a46a1982237913101a5b">vmm_getPhysicalAddr</a>((uInt32)dst)|(memAddr & 0xFFF));
<a name="l00101"></a>00101 <span class="comment">/* Unlink From Memory Map Allocated Page */</span>
<a name="l00102"></a>00102 <a class="code" href="paging_8h.html#fd94da50e455602f86ad7dae2fc9d1db">vmmUnmapPage</a>((uInt32)dst,1);
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pageTable[pageTableIndex] != 0x0) {
<a name="l00105"></a>00105 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Security failed pagetable not user permission\n"</span>);
<a name="l00106"></a>00106 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"pageTable: [0x%X:0x%X:0x%X:0x%X]\n"</span>,pageTable[pageTableIndex],pageTableIndex,pageDirectoryIndex,eip);
<a name="l00107"></a>00107 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Segfault At Address: [0x%X][0x%X][%i][0x%X] Non Mapped\n"</span>,memAddr,esp,<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>,eip);
<a name="l00108"></a>00108 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a>);
<a name="l00109"></a>00109 <a class="code" href="endtask_8h.html#152c1859ada097cc21071f471bfa2e67">endTask</a>(<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>);
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (memAddr < (<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#481c2e7084fec272e616d3fb984036e2">td</a>.<a class="code" href="structthread.html#4ce0e0e5856efc85e111d2cb8748a0ee">vm_dsize</a> + <a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#481c2e7084fec272e616d3fb984036e2">td</a>.<a class="code" href="structthread.html#c770300b493b2ea844e634b7c98c4f6a">vm_daddr</a>)) {
<a name="l00112"></a>00112 pageTable[pageTableIndex] = (<a class="code" href="types_8h.html#5847ea0262a5aa61eee48cbe95544a78">uInt32</a>)<a class="code" href="vmm_8h.html#976cf3919bf7c77c868021ec9374593b">vmmFindFreePage</a>(<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>) | <a class="code" href="paging_8h.html#f0fff7a38cd2c7a32d580787423b94ea">PAGE_DEFAULT</a>;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114 <span class="keywordflow">else</span> {
<a name="l00115"></a>00115 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a>);
<a name="l00116"></a>00116 <span class="comment">/* Need To Create A Routine For Attempting To Access Non Mapped Memory */</span>
<a name="l00117"></a>00117 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Segfault At Address: [0x%X][0x%X][%i][0x%X] Non Mapped\n"</span>,memAddr,esp,<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>,eip);
<a name="l00118"></a>00118 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"Out Of Stack Space: [0x%X]\n"</span>,memAddr & 0xFF0000);
<a name="l00119"></a>00119 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a>);
<a name="l00120"></a>00120 <a class="code" href="endtask_8h.html#152c1859ada097cc21071f471bfa2e67">endTask</a>(<a class="code" href="sched_8h.html#54397bfe18d5da4d50ff03b15f540858">_current</a>-><a class="code" href="structtaskStruct.html#30966587a60db6b40c8be6c387e11d81">id</a>);
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 <span class="keyword">asm</span> <span class="keyword">volatile</span>(
<a name="l00124"></a>00124 <span class="stringliteral">"movl %cr3,%eax\n"</span>
<a name="l00125"></a>00125 <span class="stringliteral">"movl %eax,%cr3\n"</span>
<a name="l00126"></a>00126 );
<a name="l00127"></a>00127
<a name="l00128"></a>00128 <span class="comment">/* Release the spin lock */</span>
<a name="l00129"></a>00129 <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(&<a class="code" href="pagefault_8c.html#97eea32960b19607e9418f78aadc41db">pageFaultSpinLock</a>);
<a name="l00130"></a>00130 <span class="keywordflow">return</span>;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="comment">/***</span>
<a name="l00134"></a>00134 <span class="comment"> $Log: pagefault_8c-source.html,v $
<a name="l00134"></a>00134 <span class="comment"> Revision 1.7 2006/12/15 17:47:06 reddawg
<a name="l00134"></a>00134 <span class="comment"> Updates
<a name="l00134"></a>00134 <span class="comment"></span>
<a name="l00135"></a>00135 <span class="comment"> Revision 1.6 2006/12/05 14:10:21 reddawg</span>
<a name="l00136"></a>00136 <span class="comment"> Workign Distro</span>
<a name="l00137"></a>00137 <span class="comment"></span>
<a name="l00138"></a>00138 <span class="comment"> Revision 1.5 2006/12/01 05:12:35 reddawg</span>
<a name="l00139"></a>00139 <span class="comment"> We're almost there... :)</span>
<a name="l00140"></a>00140 <span class="comment"></span>
<a name="l00141"></a>00141 <span class="comment"> Revision 1.4 2006/11/21 13:25:49 reddawg</span>
<a name="l00142"></a>00142 <span class="comment"> A handful of changes ;)</span>
<a name="l00143"></a>00143 <span class="comment"></span>
<a name="l00144"></a>00144 <span class="comment"> Revision 1.3 2006/11/06 19:10:12 reddawg</span>
<a name="l00145"></a>00145 <span class="comment"> Lots Of Updates... Still having issues with brk();</span>
<a name="l00146"></a>00146 <span class="comment"></span>
<a name="l00147"></a>00147 <span class="comment"> Revision 1.2 2006/10/31 20:44:19 reddawg</span>
<a name="l00148"></a>00148 <span class="comment"> Lots of changes</span>
<a name="l00149"></a>00149 <span class="comment"></span>
<a name="l00150"></a>00150 <span class="comment"> Revision 1.1.1.1 2006/06/01 12:46:13 reddawg</span>
<a name="l00151"></a>00151 <span class="comment"> ubix2</span>
<a name="l00152"></a>00152 <span class="comment"></span>
<a name="l00153"></a>00153 <span class="comment"> Revision 1.2 2005/10/12 00:13:38 reddawg</span>
<a name="l00154"></a>00154 <span class="comment"> Removed</span>
<a name="l00155"></a>00155 <span class="comment"></span>
<a name="l00156"></a>00156 <span class="comment"> Revision 1.1.1.1 2005/09/26 17:24:52 reddawg</span>
<a name="l00157"></a>00157 <span class="comment"> no message</span>
<a name="l00158"></a>00158 <span class="comment"></span>
<a name="l00159"></a>00159 <span class="comment"> Revision 1.14 2004/08/25 22:02:41 reddawg</span>
<a name="l00160"></a>00160 <span class="comment"> task switching - We now are using software switching to be consistant with the rest of the world because all of this open source freaks gave me a hard time about something I liked. There doesn't seem to be any gain in performance but it is working fine and flawlessly</span>
<a name="l00161"></a>00161 <span class="comment"></span>
<a name="l00162"></a>00162 <span class="comment"> Revision 1.13 2004/08/24 05:24:37 reddawg</span>
<a name="l00163"></a>00163 <span class="comment"> TCA Is A BONER!!!!</span>
<a name="l00164"></a>00164 <span class="comment"></span>
<a name="l00165"></a>00165 <span class="comment"> Revision 1.12 2004/08/14 11:23:03 reddawg</span>
<a name="l00166"></a>00166 <span class="comment"> Changes</span>
<a name="l00167"></a>00167 <span class="comment"></span>
<a name="l00168"></a>00168 <span class="comment"> Revision 1.11 2004/07/28 15:05:43 reddawg</span>
<a name="l00169"></a>00169 <span class="comment"> Major:</span>
<a name="l00170"></a>00170 <span class="comment"> Pages now have strict security enforcement.</span>
<a name="l00171"></a>00171 <span class="comment"> Many null dereferences have been resolved.</span>
<a name="l00172"></a>00172 <span class="comment"> When apps loaded permissions set for pages rw and ro</span>
<a name="l00173"></a>00173 <span class="comment"></span>
<a name="l00174"></a>00174 <span class="comment"> Revision 1.10 2004/07/28 00:22:56 reddawg</span>
<a name="l00175"></a>00175 <span class="comment"> bah</span>
<a name="l00176"></a>00176 <span class="comment"></span>
<a name="l00177"></a>00177 <span class="comment"> Revision 1.9 2004/07/28 00:17:05 reddawg</span>
<a name="l00178"></a>00178 <span class="comment"> Major:</span>
<a name="l00179"></a>00179 <span class="comment"> Disconnected page 0x0 from the system... Unfortunately this broke many things</span>
<a name="l00180"></a>00180 <span class="comment"> all of which have been fixed. This was good because nothing deferences NULL</span>
<a name="l00181"></a>00181 <span class="comment"> any more.</span>
<a name="l00182"></a>00182 <span class="comment"></span>
<a name="l00183"></a>00183 <span class="comment"> Things affected:</span>
<a name="l00184"></a>00184 <span class="comment"> malloc,kmalloc,getfreepage,getfreevirtualpage,pagefault,fork,exec,ld,ld.so,exec,file</span>
<a name="l00185"></a>00185 <span class="comment"></span>
<a name="l00186"></a>00186 <span class="comment"> Revision 1.8 2004/07/27 07:09:38 reddawg</span>
<a name="l00187"></a>00187 <span class="comment"> Put in a test for 0x0</span>
<a name="l00188"></a>00188 <span class="comment"></span>
<a name="l00189"></a>00189 <span class="comment"> Revision 1.7 2004/07/26 19:15:49 reddawg</span>
<a name="l00190"></a>00190 <span class="comment"> test code, fixes and the like</span>
<a name="l00191"></a>00191 <span class="comment"></span>
<a name="l00192"></a>00192 <span class="comment"> Revision 1.6 2004/07/24 23:04:44 reddawg</span>
<a name="l00193"></a>00193 <span class="comment"> Changes... mark let me know if you fault at pid 185 when you type stress</span>
<a name="l00194"></a>00194 <span class="comment"></span>
<a name="l00195"></a>00195 <span class="comment"> Revision 1.5 2004/07/24 20:00:51 reddawg</span>
<a name="l00196"></a>00196 <span class="comment"> Lots of changes to the vmm subsystem.... Page faults have been adjust to now be blocking on a per thread basis not system wide. This has resulted in no more deadlocks.. also the addition of per thread locking has removed segfaults as a result of COW in which two tasks fault the same COW page and try to modify it.</span>
<a name="l00197"></a>00197 <span class="comment"></span>
<a name="l00198"></a>00198 <span class="comment"> Revision 1.4 2004/07/24 17:47:28 reddawg</span>
<a name="l00199"></a>00199 <span class="comment"> vmm_pageFault: deadlock resolved thanks to a propper solution suggested by geist</span>
<a name="l00200"></a>00200 <span class="comment"></span>
<a name="l00201"></a>00201 <span class="comment"> Revision 1.3 2004/07/19 02:05:26 reddawg</span>
<a name="l00202"></a>00202 <span class="comment"> vmmPageFault: had a potential memory leak here for one page it was still using sysID on certain COW scenarios</span>
<a name="l00203"></a>00203 <span class="comment"></span>
<a name="l00204"></a>00204 <span class="comment"> Revision 1.2 2004/06/10 22:23:56 reddawg</span>
<a name="l00205"></a>00205 <span class="comment"> Volatiles</span>
<a name="l00206"></a>00206 <span class="comment"></span>
<a name="l00207"></a>00207 <span class="comment"> Revision 1.1.1.1 2004/04/15 12:06:52 reddawg</span>
<a name="l00208"></a>00208 <span class="comment"> UbixOS v1.0</span>
<a name="l00209"></a>00209 <span class="comment"></span>
<a name="l00210"></a>00210 <span class="comment"> Revision 1.4 2004/04/13 16:36:34 reddawg</span>
<a name="l00211"></a>00211 <span class="comment"> Changed our copyright, it is all now under a BSD-Style license</span>
<a name="l00212"></a>00212 <span class="comment"></span>
<a name="l00213"></a>00213 <span class="comment"> END</span>
<a name="l00214"></a>00214 <span class="comment"> ***/</span>
</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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