/*****************************************************************************************
 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,
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 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 _PAGING_H
#define _PAGING_H

#include <ubixos/types.h>

#define pageLength        0x00000400
#define pageSize          4096
#define pageEntries       (pageSize/4)
#define pageCow           0x00000200
#define tablesBaseAddress   0xBFC00000
#define parentPageDirAddr   0x100000

#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)

int vmmClearVirtualPage(uInt32 pageAddr);

void vmmUnmapPage(uInt32,int);
void vmmUnmapPages(void *,uInt32);
void *vmmMapFromTask(pidType,void *,uInt32);
void *vmmCopyVirtualSpace(pidType);
void *vmmGetFreePage(pidType);
void *vmmGetFreeKernelPage(pidType pid,uInt16 count);
void *vmmCreateVirtualSpace(pidType);
void *vmmGetFreeVirtualPage(pidType,int);

uInt32 vmm_getPhysicalAddr(uInt32);
int    vmm_setPageAttributes(uInt32,uInt16);
int    vmm_remapPage(uInt32,uInt32,uInt16);
int    vmm_pagingInit();
void  *vmm_getFreeMallocPage(uInt16 count);
void   vmm_pageFault(uInt32,uInt32,uInt32);
void  _vmm_pageFault();

extern uInt32 *kernelPageDirectory;

#endif

/***
 $Log$
 Revision 1.1.1.1  2005/09/26 17:23:58  reddawg
 no message

 Revision 1.8  2004/08/14 11:23:02  reddawg
 Changes

 Revision 1.7  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 1.6  2004/07/26 19:15:49  reddawg
 test code, fixes and the like

 Revision 1.5  2004/07/24 23:04:44  reddawg
 Changes... mark let me know if you fault at pid 185 when you type stress

 Revision 1.4  2004/07/24 20:00:51  reddawg
 Lots of changes to the vmm subsystem.... Page faults have been adjust to now be blocking on a per thread basis not system wide. This has resulted in no more deadlocks.. also the addition of per thread locking has removed segfaults as a result of COW in which two tasks fault the same COW page and try to modify it.

 Revision 1.3  2004/07/22 17:32:25  reddawg
 I broke it hopefully

 Revision 1.2  2004/05/21 15:21:04  reddawg
 Cleaned up


 END
 ***/
