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/*
* Copyright (C) 2002-2004 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: paging.h,v 1.12 2004/10/12 10:45:10 harekiet Exp $ */
#ifndef _PAGING_H_
#define _PAGING_H_
#include "dosbox.h"
#include "mem.h"
class PageDirectory;
#define MEM_PAGE_SIZE (4096)
#define XMS_START (0x110)
#define TLB_SIZE (1024*1024)
#define PFLAG_READABLE 0x1
#define PFLAG_WRITEABLE 0x2
#define PFLAG_HASROM 0x4
#define PFLAG_HASCODE 0x8 //Page contains dynamic code
#define PFLAG_NOCODE 0x10 //No dynamic code can be generated here
#define PFLAG_INIT 0x20 //No dynamic code can be generated here
#define LINK_START ((1024+64)/4) //Start right after the HMA
//Allow 128 mb of memory to be linked
#define PAGING_LINKS (128*1024/4)
class PageHandler {
public:
virtual Bitu readb(PhysPt addr);
virtual Bitu readw(PhysPt addr);
virtual Bitu readd(PhysPt addr);
virtual void writeb(PhysPt addr,Bitu val);
virtual void writew(PhysPt addr,Bitu val);
virtual void writed(PhysPt addr,Bitu val);
virtual HostPt GetHostPt(Bitu phys_page);
Bitu flags;
};
/* Some other functions */
void PAGING_Enable(bool enabled);
bool PAGING_Enabled(void);
Bitu PAGING_GetDirBase(void);
void PAGING_SetDirBase(Bitu cr3);
void PAGING_InitTLB(void);
void PAGING_ClearTLB(void);
void PAGING_LinkPage(Bitu lin_page,Bitu phys_page);
void PAGING_UnlinkPages(Bitu lin_page,Bitu pages);
/* This maps the page directly, only use when paging is disabled */
void PAGING_MapPage(Bitu lin_page,Bitu phys_page);
bool PAGING_MakePhysPage(Bitu & page);
void MEM_SetLFB(Bitu _page,Bitu _pages,HostPt _pt);
void MEM_SetPageHandler(Bitu phys_page,Bitu pages,PageHandler * handler);
void MEM_ResetPageHandler(Bitu phys_page, Bitu pages);
#ifdef _MSC_VER
#pragma pack (1)
#endif
struct X86_PageEntryBlock{
Bit32u p:1;
Bit32u wr:1;
Bit32u us:1;
Bit32u pwt:1;
Bit32u pcd:1;
Bit32u a:1;
Bit32u d:1;
Bit32u pat:1;
Bit32u g:1;
Bit32u avl:3;
Bit32u base:20;
} GCC_ATTRIBUTE(packed);
#ifdef _MSC_VER
#pragma pack ()
#endif
union X86PageEntry {
Bit32u load;
X86_PageEntryBlock block;
};
struct PagingBlock {
Bitu cr3;
Bitu cr2;
struct {
Bitu page;
PhysPt addr;
} base;
struct {
HostPt read[TLB_SIZE];
HostPt write[TLB_SIZE];
PageHandler * handler[TLB_SIZE];
Bit32u phys_page[TLB_SIZE];
} tlb;
struct {
Bitu used;
Bit32u entries[PAGING_LINKS];
} links;
bool enabled;
};
extern PagingBlock paging;
/* Some support functions */
PageHandler * MEM_GetPageHandler(Bitu phys_page);
/* Unaligned address handlers */
Bit16u mem_unalignedreadw(PhysPt address);
Bit32u mem_unalignedreadd(PhysPt address);
void mem_unalignedwritew(PhysPt address,Bit16u val);
void mem_unalignedwrited(PhysPt address,Bit32u val);
/* Special inlined memory reading/writing */
INLINE Bit8u mem_readb_inline(PhysPt address) {
Bitu index=(address>>12);
if (paging.tlb.read[index]) return host_readb(paging.tlb.read[index]+address);
else return paging.tlb.handler[index]->readb(address);
}
INLINE Bit16u mem_readw_inline(PhysPt address) {
if (address & 1) return mem_unalignedreadw(address);
Bitu index=(address>>12);
if (paging.tlb.read[index]) return host_readw(paging.tlb.read[index]+address);
else return paging.tlb.handler[index]->readw(address);
}
INLINE Bit32u mem_readd_inline(PhysPt address) {
if (address & 3) return mem_unalignedreadd(address);
Bitu index=(address>>12);
if (paging.tlb.read[index]) return host_readd(paging.tlb.read[index]+address);
else return paging.tlb.handler[index]->readd(address);
}
INLINE void mem_writeb_inline(PhysPt address,Bit8u val) {
Bitu index=(address>>12);
if (paging.tlb.write[index]) host_writeb(paging.tlb.write[index]+address,val);
else paging.tlb.handler[index]->writeb(address,val);
}
INLINE void mem_writew_inline(PhysPt address,Bit16u val) {
if (address & 1) {mem_unalignedwritew(address,val);return;}
Bitu index=(address>>12);
if (paging.tlb.write[index]) host_writew(paging.tlb.write[index]+address,val);
else paging.tlb.handler[index]->writew(address,val);
}
INLINE void mem_writed_inline(PhysPt address,Bit32u val) {
if (address & 3) {mem_unalignedwrited(address,val);return;}
Bitu index=(address>>12);
if (paging.tlb.write[index]) host_writed(paging.tlb.write[index]+address,val);
else paging.tlb.handler[index]->writed(address,val);
}
#endif
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