getphysicaladdr.c

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/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors.
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors in the documentation and/or
 *    other materials provided with the distribution.
 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <vmm/vmm.h>
 
/* returns the real address of page is page aligned */
uint32_t vmm_getPhysicalAddr(uint32_t pageAddr) {
  int pageDirectoryIndex = 0x0, pageTableIndex = 0x0;
  uint32_t *pageTable = 0x0;
 
  //Calculate The Page Directory Index
  pageDirectoryIndex = (pageAddr >> 22);
 
  //Calculate The Page Table Index
  pageTableIndex = ((pageAddr >> 12) & 0x3FF);
 
  /* Set pageTable To The Virtual Address Of Table */
  pageTable = (uint32_t *) (PT_BASE_ADDR + (0x1000 * pageDirectoryIndex));
 
  /* Return The Physical Address Of The Page */
  return ((uint32_t) (pageTable[pageTableIndex] & 0xFFFFF000));
}
 
/* Returns the real address not page aligned */
uint32_t vmm_getRealAddr(uint32_t addr) {
  int pageDirectoryIndex = 0x0, pageTableIndex = 0x0;
  uint32_t *pageTable = 0x0;
 
  //Calculate The Page Directory Index
  pageDirectoryIndex = (addr >> 22);
 
  //Calculate The Page Table Index
  pageTableIndex = ((addr >> 12) & 0x3FF);
 
  /* Set pageTable To The Virtual Address Of Table */
  pageTable = (uint32_t *) (PT_BASE_ADDR + (0x1000 * pageDirectoryIndex));
  /* Return The Physical Address Of The Page */
  return ((uint32_t) (pageTable[pageTableIndex] & 0xFFFFF000) + (addr & 0xFFF));
}