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# unmappage.c

Go to the documentation of this file.

    00001 /*****************************************************************************************
    00002  Copyright (c) 2002-2004 The UbixOS Project
    00003  All rights reserved.
    00004
    00005  Redistribution and use in source and binary forms, with or without modification, are
    00006  permitted provided that the following conditions are met:
    00007
    00008  Redistributions of source code must retain the above copyright notice, this list of
    00009  conditions, the following disclaimer and the list of authors.  Redistributions in binary
    00010  form must reproduce the above copyright notice, this list of conditions, the following
    00011  disclaimer and the list of authors in the documentation and/or other materials provided
    00012  with the distribution. Neither the name of the UbixOS Project nor the names of its
    00013  contributors may be used to endorse or promote products derived from this software
    00014  without specific prior written permission.
    00015
    00016  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
    00017  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    00018  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
    00019  THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    00020  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
    00021  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00022  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    00023  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    00024  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00025
    00026  $Id: unmappage_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00027
    00028 *****************************************************************************************/
    00029
    00030 #include <vmm/vmm.h>
    00031
    00032 /************************************************************************
    00033
    00034 Function: void vmmUnmapPage(uInt32 pageAddr,int flags);
    00035 Description: This Function Will Unmap A Page From The Kernel VM Space
    00036              The Flags Variable Decides If Its To Free The Page Or Not
    00037              A Flag Of 0 Will Free It And A Flag Of 1 Will Keep It
    00038 Notes:
    00039
    00040 07/30/02 - I Have Decided That This Should Free The Physical Page There
    00041            Is No Reason To Keep It Marked As Not Available
    00042
    00043 07/30/02 - Ok A Found A Reason To Keep It Marked As Available I Admit
    00044            Even I Am Not Perfect Ok The Case Where You Wouldn't Want To
    00045            Free It Would Be On Something Like Where I Allocated A Page
    00046            To Create A New Virtual Space So Now It Has A Flag
    00047
    00048 ************************************************************************/
    00049 void
    00050 vmmUnmapPage(uInt32 pageAddr, int flags)
    00051 {
    00052   int             pageDirectoryIndex = 0, pageTableIndex = 0;
    00053   uInt32         *pageTable = 0x0;
    00054
    00055   /* Get The Index To The Page Directory */
    00056   pageDirectoryIndex = (pageAddr >> 22);
    00057
    00058   //Calculate The Page Table Index
    00059   pageTableIndex = ((pageAddr >> 12) & 0x3FF);
    00060
    00061   /* Set pageTable To The Virtual Address Of Table */
    00062   pageTable = (uInt32 *) (tablesBaseAddress + (0x1000 * pageDirectoryIndex));
    00063   /* Free The Physical Page If Flags Is 0 */
    00064   if (flags == 0) {
    00065
    00066     /*
    00067      * This is temp i think its still an issue clearVirtualPage(pageAddr);
    00068      * freePage((uInt32)(pageTable[pageTableIndex] & 0xFFFFF000));
    00069      */
    00070   }
    00071   /* Unmap The Page */
    00072   pageTable[pageTableIndex] = 0x0;
    00073   /* Rehash The Page Directory */
    00074   asm volatile(
    00075       "movl %cr3,%eax\n"
    00076       "movl %eax,%cr3\n"
    00077     );
    00078   /* Return */
    00079   return;
    00080 }
    00081
    00082
    00083
    00084 /************************************************************************
    00085
    00086 Function: void vmmUnmapPages(uInt32 pageAddr,int flags);
    00087 Description: This Function Will Unmap A Page From The Kernel VM Space
    00088              The Flags Variable Decides If Its To Free The Page Or Not
    00089              A Flag Of 0 Will Free It And A Flag Of 1 Will Keep It
    00090 Notes:
    00091
    00092 07/30/02 - I Have Decided That This Should Free The Physical Page There
    00093            Is No Reason To Keep It Marked As Not Available
    00094
    00095 07/30/02 - Ok A Found A Reason To Keep It Marked As Available I Admit
    00096            Even I Am Not Perfect Ok The Case Where You Wouldn't Want To
    00097            Free It Would Be On Something Like Where I Allocated A Page
    00098            To Create A New Virtual Space So Now It Has A Flag
    00099
    00100 ************************************************************************/
    00101 void vmmUnmapPages(void *ptr,uInt32 size) {
    00102   uInt32 baseAddr = (uInt32)ptr & 0xFFFFF000;
    00103   uInt32 dI = 0x0,tI = 0x0;
    00104   uInt32 y = 0x0;
    00105   uInt32 *pageTable = 0x0;
    00106
    00107   dI = (baseAddr/(1024*4096));
    00108   tI = ((baseAddr-(dI*(1024*4096)))/4096);
    00109   pageTable = (uInt32 *)(tablesBaseAddress + (4096*dI));
    00110   for (y=tI;y<(tI+((size+4095)/4096));y++) {
    00111     pageTable[y] = 0x0;
    00112     }
    00113   return;
    00114   }
    00115
    00116 /***
    00117  $Log: unmappage_8c-source.html,v $
    00117  Revision 1.7  2006/12/15 17:47:08  reddawg
    00117  Updates
    00117
    00118  Revision 1.1.1.1  2006/06/01 12:46:13  reddawg
    00119  ubix2
    00120
    00121  Revision 1.2  2005/10/12 00:13:38  reddawg
    00122  Removed
    00123
    00124  Revision 1.1.1.1  2005/09/26 17:24:54  reddawg
    00125  no message
    00126
    00127  Revision 1.4  2004/07/26 19:15:49  reddawg
    00128  test code, fixes and the like
    00129
    00130  Revision 1.3  2004/06/15 12:35:05  reddawg
    00131  Cleaned Up
    00132
    00133  Revision 1.2  2004/06/10 22:23:56  reddawg
    00134  Volatiles
    00135
    00136  Revision 1.1.1.1  2004/04/15 12:06:53  reddawg
    00137  UbixOS v1.0
    00138
    00139  Revision 1.7  2004/04/13 16:36:34  reddawg
    00140  Changed our copyright, it is all now under a BSD-Style license
    00141
    00142  END
    00143  ***/