# setpageattributes.c

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    00001 /*****************************************************************************************
    00002  Copyright (c) 2002 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: setpageattributes_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00027
    00028 *****************************************************************************************/
    00029
    00030 #include <vmm/vmm.h>
    00031 #include <ubixos/kpanic.h>
    00032
    00033 /************************************************************************
    00034
    00035 Function: void vmmSetPageAttributes(uInt32 pageAddr,int attributes;
    00036 Description: This Function Will Set The Page Attributes Such As
    00037              A Read Only Page, Stack Page, COW Page, ETC.
    00038 Notes:
    00039
    00040 ************************************************************************/
    00041 int vmm_setPageAttributes(uInt32 memAddr,uInt16 attributes) {
    00042   uInt16          directoryIndex = 0x0, tableIndex = 0x0;
    00043   uInt32         *pageTable = 0x0;
    00044
    00045   /* Calculate The Page Directory Index */
    00046   directoryIndex = (memAddr >> 22);
    00047
    00048   /* Calculate The Page Table Index */
    00049   tableIndex = ((memAddr >> 12) & 0x3FF);
    00050
    00051   /* Set Table Pointer */
    00052   if ((pageTable = (uInt32 *) (tablesBaseAddress + (0x1000 * directoryIndex))) == 0x0)
    00053     kpanic("Error: pageTable == NULL, File: %s, Line: %i\n",__FILE__,__LINE__);
    00054
    00055   /* Set Attribute If Page Is Mapped */
    00056   if (pageTable[tableIndex] != 0x0)
    00057     pageTable[tableIndex] = ((pageTable[tableIndex] & 0xFFFFF000) | attributes);
    00058
    00059   /* Reload The Page Table; */
    00060   asm volatile(
    00061       "push %eax     \n"
    00062       "movl %cr3,%eax\n"
    00063       "movl %eax,%cr3\n"
    00064       "pop  %eax     \n"
    00065     );
    00066   /* Return */
    00067   return(0x0);
    00068   }
    00069
    00070 /***
    00071  $Log: setpageattributes_8c-source.html,v $
    00071  Revision 1.7  2006/12/15 17:47:07  reddawg
    00071  Updates
    00071
    00072  Revision 1.1.1.1  2006/06/01 12:46:13  reddawg
    00073  ubix2
    00074
    00075  Revision 1.2  2005/10/12 00:13:38  reddawg
    00076  Removed
    00077
    00078  Revision 1.1.1.1  2005/09/26 17:24:53  reddawg
    00079  no message
    00080
    00081  Revision 1.4  2004/07/28 15:05:43  reddawg
    00082  Major:
    00083    Pages now have strict security enforcement.
    00084    Many null dereferences have been resolved.
    00085    When apps loaded permissions set for pages rw and ro
    00086
    00087  Revision 1.3  2004/07/20 22:29:55  reddawg
    00088  assert: remade assert
    00089
    00090  Revision 1.2  2004/06/10 22:23:56  reddawg
    00091  Volatiles
    00092
    00093  Revision 1.1.1.1  2004/04/15 12:06:53  reddawg
    00094  UbixOS v1.0
    00095
    00096  Revision 1.6  2004/04/13 16:36:34  reddawg
    00097  Changed our copyright, it is all now under a BSD-Style license
    00098
    00099  END
    00100  ***/
    00101