/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

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

 Redistributions of source code must retain the above copyright notice, this list of
 conditions, the following disclaimer and the list of authors.  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. 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 COPYRIGHT HOLDERS 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.

 $Id$

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

#ifndef _VMM_H
#define _VMM_H

#include <types.h>

#define VMM_PAGECOW                 0x00000200
#define VMM_MEMAVAIL                         1
#define VMM_MEMNOTAVAIL                      2
#define VMM_SYS_ID                          -1
#define VMM_ID                              -3
#define VMM_PARENTPAGEDIRADDR       0x00100000
#define VMM_TABLESBASEADDR          0xBFC00000
#define VMM_PAGELENGTH              0x00000400
#define VMM_PAGESIZE                      4096
#define VMM_PAGEENTRIES       (VMM_PAGESIZE/4)
#define VMM_MEMORYMAPADDR           0xE6667000


#define PAGE_STACK          0x00000400
#define PAGE_PRESENT        0x00000001
#define PAGE_WRITE          0x00000002
#define PAGE_USER           0x00000004
#define PAGE_DEFAULT        (PAGE_PRESENT|PAGE_WRITE|PAGE_USER)
#define KERNEL_PAGE_DEFAULT (PAGE_PRESENT|PAGE_WRITE)

typedef struct {
  uInt32  pageAddr;
  uInt16 status;
  uInt16 reserved;
  pid_t  pid;
  int    cowCounter;
  } mMap;

void   *vmm_getFreeMallocPage(u_int16_t);  
int     vmm_clearVirtualPage(u_int32_t);
void    vmm_pageFault();
void   _vmm_pageFault();
int     vmm_pagingInit();
int     vmm_remapPage(uInt32,uInt32,uInt16,pid_t);
void    vmm_freeProcessPages(pid_t);
int     vmm_adjustCowCounter(uInt32,int);
int     vmm_freePage(uInt32);
uInt32  vmm_findFreePage(pid_t);
int     vmm_buildMemoryMap();
int     vmm_init();

extern uInt32  vmm_numPages;
extern mMap   *vmm_memoryMap;

#endif

/***
 END
 ***/