/**************************************************************************************
 Copyright (c) 2002
      The UbixOS Project

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

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 $Id: getphysicaladdr.c,v 1.1 2003/04/19 11:31:35 reddawg Exp $
**************************************************************************************/

#include <vmm/paging.h>

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

Function: void *getPhysicalAddr();
Description: Returns The Physical Address Of The Virtual Page
Notes:

************************************************************************/
void *getPhysicalAddr(uLong pageAddr) {
  int pageDirectoryIndex=0,pageTableIndex=0;
  uLong *pageTable = 0x0;
  //Get The Index To The Page Directory
  pageDirectoryIndex = (pageAddr/(1024*4096));
  //Get The Index To The Page Table
  pageTableIndex = ((pageAddr-(pageDirectoryIndex*(1024*4096)))/4096);
  //Set pageTable To The Virtual Address Of Table
  pageTable = (uLong *)(tablesBaseAddress + (4096 * pageDirectoryIndex));
  //Return The Physical Address Of The Page
  return((void *)(pageTable[pageTableIndex] & 0xFFFFF000));
  }