setpageattributes.c

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/*****************************************************************************************
 Copyright (c) 2002 The UbixOS Project
 All rights reserved.

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permitted provided that the following conditions are met:

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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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 $Id: setpageattributes_8c-source.html 88 2016-01-12 00:11:29Z reddawg $

*****************************************************************************************/

#include <vmm/vmm.h>
#include <ubixos/kpanic.h>

/************************************************************************

Function: void vmmSetPageAttributes(uInt32 pageAddr,int attributes;
Description: This Function Will Set The Page Attributes Such As
             A Read Only Page, Stack Page, COW Page, ETC.
Notes:

************************************************************************/
int vmm_setPageAttributes(uInt32 memAddr,uInt16 attributes) {
  uInt16          directoryIndex = 0x0, tableIndex = 0x0;
  uInt32         *pageTable = 0x0;

  /* Calculate The Page Directory Index */
  directoryIndex = (memAddr >> 22);
  
  /* Calculate The Page Table Index */
  tableIndex = ((memAddr >> 12) & 0x3FF);

  /* Set Table Pointer */
  if ((pageTable = (uInt32 *) (tablesBaseAddress + (0x1000 * directoryIndex))) == 0x0)
    kpanic("Error: pageTable == NULL, File: %s, Line: %i\n",__FILE__,__LINE__);
    
  /* Set Attribute If Page Is Mapped */
  if (pageTable[tableIndex] != 0x0)
    pageTable[tableIndex] = ((pageTable[tableIndex] & 0xFFFFF000) | attributes);

  /* Reload The Page Table; */
  asm volatile(
      "push %eax     \n"
      "movl %cr3,%eax\n"
      "movl %eax,%cr3\n"
      "pop  %eax     \n"
    );
  /* Return */
  return(0x0);
  }

/***
 $Log: setpageattributes_8c-source.html,v $
 Revision 1.7  2006/12/15 17:47:07  reddawg
 Updates

 Revision 1.1.1.1  2006/06/01 12:46:13  reddawg
 ubix2

 Revision 1.2  2005/10/12 00:13:38  reddawg
 Removed

 Revision 1.1.1.1  2005/09/26 17:24:53  reddawg
 no message

 Revision 1.4  2004/07/28 15:05:43  reddawg
 Major:
   Pages now have strict security enforcement.
   Many null dereferences have been resolved.
   When apps loaded permissions set for pages rw and ro

 Revision 1.3  2004/07/20 22:29:55  reddawg
 assert: remade assert

 Revision 1.2  2004/06/10 22:23:56  reddawg
 Volatiles

 Revision 1.1.1.1  2004/04/15 12:06:53  reddawg
 UbixOS v1.0

 Revision 1.6  2004/04/13 16:36:34  reddawg
 Changed our copyright, it is all now under a BSD-Style license

 END
 ***/

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