dosbox-wii/include/paging.h

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/*
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* Copyright (C) 2002-2019 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.
*
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* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef DOSBOX_PAGING_H
#define DOSBOX_PAGING_H
#ifndef DOSBOX_DOSBOX_H
#include "dosbox.h"
#endif
#ifndef DOSBOX_MEM_H
#include "mem.h"
#endif
// disable this to reduce the size of the TLB
// NOTE: does not work with the dynamic core (dynrec is fine)
#ifndef HW_RVL
#define USE_FULL_TLB
#endif
class PageDirectory;
#define MEM_PAGE_SIZE (4096)
#define XMS_START (0x110)
#if defined(USE_FULL_TLB)
#define TLB_SIZE (1024*1024)
#else
#define TLB_SIZE 65536 // This must a power of 2 and greater then LINK_START
#define BANK_SHIFT 28
#define BANK_MASK 0xffff // always the same as TLB_SIZE-1?
#define TLB_BANKS ((1024*1024/TLB_SIZE)-1)
#endif
#define PFLAG_READABLE 0x1
#define PFLAG_WRITEABLE 0x2
#define PFLAG_HASROM 0x4
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#define PFLAG_HASCODE32 0x8 //Page contains 32-bit dynamic code
#define PFLAG_NOCODE 0x10 //No dynamic code can be generated here
#define PFLAG_INIT 0x20 //No dynamic code can be generated here
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#define PFLAG_HASCODE16 0x40 //Page contains 16-bit dynamic code
#define PFLAG_HASCODE (PFLAG_HASCODE32|PFLAG_HASCODE16)
#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 ~PageHandler(void) { }
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 GetHostReadPt(Bitu phys_page);
virtual HostPt GetHostWritePt(Bitu phys_page);
virtual bool readb_checked(PhysPt addr,Bit8u * val);
virtual bool readw_checked(PhysPt addr,Bit16u * val);
virtual bool readd_checked(PhysPt addr,Bit32u * val);
virtual bool writeb_checked(PhysPt addr,Bitu val);
virtual bool writew_checked(PhysPt addr,Bitu val);
virtual bool writed_checked(PhysPt addr,Bitu val);
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_LinkPage_ReadOnly(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);
bool PAGING_ForcePageInit(Bitu lin_addr);
void MEM_SetLFB(Bitu page, Bitu pages, PageHandler *handler, PageHandler *mmiohandler);
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{
#ifdef WORDS_BIGENDIAN
Bit32u base:20;
Bit32u avl:3;
Bit32u g:1;
Bit32u pat:1;
Bit32u d:1;
Bit32u a:1;
Bit32u pcd:1;
Bit32u pwt:1;
Bit32u us:1;
Bit32u wr:1;
Bit32u p:1;
#else
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;
#endif
} GCC_ATTRIBUTE(packed);
#ifdef _MSC_VER
#pragma pack ()
#endif
union X86PageEntry {
Bit32u load;
X86_PageEntryBlock block;
};
#if !defined(USE_FULL_TLB)
typedef struct {
HostPt read;
HostPt write;
PageHandler * readhandler;
PageHandler * writehandler;
Bit32u phys_page;
} tlb_entry;
#endif
struct PagingBlock {
Bitu cr3;
Bitu cr2;
struct {
Bitu page;
PhysPt addr;
} base;
#if defined(USE_FULL_TLB)
struct {
HostPt read[TLB_SIZE];
HostPt write[TLB_SIZE];
PageHandler * readhandler[TLB_SIZE];
PageHandler * writehandler[TLB_SIZE];
Bit32u phys_page[TLB_SIZE];
} tlb;
#else
tlb_entry tlbh[TLB_SIZE];
tlb_entry *tlbh_banks[TLB_BANKS];
#endif
struct {
Bitu used;
Bit32u entries[PAGING_LINKS];
} links;
Bit32u firstmb[LINK_START];
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);
bool mem_unalignedreadw_checked(PhysPt address,Bit16u * val);
bool mem_unalignedreadd_checked(PhysPt address,Bit32u * val);
bool mem_unalignedwritew_checked(PhysPt address,Bit16u val);
bool mem_unalignedwrited_checked(PhysPt address,Bit32u val);
#if defined(USE_FULL_TLB)
static INLINE HostPt get_tlb_read(PhysPt address) {
return paging.tlb.read[address>>12];
}
static INLINE HostPt get_tlb_write(PhysPt address) {
return paging.tlb.write[address>>12];
}
static INLINE PageHandler* get_tlb_readhandler(PhysPt address) {
return paging.tlb.readhandler[address>>12];
}
static INLINE PageHandler* get_tlb_writehandler(PhysPt address) {
return paging.tlb.writehandler[address>>12];
}
/* Use these helper functions to access linear addresses in readX/writeX functions */
static INLINE PhysPt PAGING_GetPhysicalPage(PhysPt linePage) {
return (paging.tlb.phys_page[linePage>>12]<<12);
}
static INLINE PhysPt PAGING_GetPhysicalAddress(PhysPt linAddr) {
return (paging.tlb.phys_page[linAddr>>12]<<12)|(linAddr&0xfff);
}
#else
void PAGING_InitTLBBank(tlb_entry **bank);
static INLINE tlb_entry *get_tlb_entry(PhysPt address) {
Bitu index=(address>>12);
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if (TLB_BANKS && (index >= TLB_SIZE)) {
Bitu bank=(address>>BANK_SHIFT) - 1;
if (!paging.tlbh_banks[bank])
PAGING_InitTLBBank(&paging.tlbh_banks[bank]);
return &paging.tlbh_banks[bank][index & BANK_MASK];
}
return &paging.tlbh[index];
}
static INLINE HostPt get_tlb_read(PhysPt address) {
return get_tlb_entry(address)->read;
}
static INLINE HostPt get_tlb_write(PhysPt address) {
return get_tlb_entry(address)->write;
}
static INLINE PageHandler* get_tlb_readhandler(PhysPt address) {
return get_tlb_entry(address)->readhandler;
}
static INLINE PageHandler* get_tlb_writehandler(PhysPt address) {
return get_tlb_entry(address)->writehandler;
}
/* Use these helper functions to access linear addresses in readX/writeX functions */
static INLINE PhysPt PAGING_GetPhysicalPage(PhysPt linePage) {
tlb_entry *entry = get_tlb_entry(linePage);
return (entry->phys_page<<12);
}
static INLINE PhysPt PAGING_GetPhysicalAddress(PhysPt linAddr) {
tlb_entry *entry = get_tlb_entry(linAddr);
return (entry->phys_page<<12)|(linAddr&0xfff);
}
#endif
/* Special inlined memory reading/writing */
static INLINE Bit8u mem_readb_inline(PhysPt address) {
HostPt tlb_addr=get_tlb_read(address);
if (tlb_addr) return host_readb(tlb_addr+address);
else return (Bit8u)(get_tlb_readhandler(address))->readb(address);
}
static INLINE Bit16u mem_readw_inline(PhysPt address) {
if ((address & 0xfff)<0xfff) {
HostPt tlb_addr=get_tlb_read(address);
if (tlb_addr) return host_readw(tlb_addr+address);
else return (Bit16u)(get_tlb_readhandler(address))->readw(address);
} else return mem_unalignedreadw(address);
}
static INLINE Bit32u mem_readd_inline(PhysPt address) {
if ((address & 0xfff)<0xffd) {
HostPt tlb_addr=get_tlb_read(address);
if (tlb_addr) return host_readd(tlb_addr+address);
else return (get_tlb_readhandler(address))->readd(address);
} else return mem_unalignedreadd(address);
}
static INLINE void mem_writeb_inline(PhysPt address,Bit8u val) {
HostPt tlb_addr=get_tlb_write(address);
if (tlb_addr) host_writeb(tlb_addr+address,val);
else (get_tlb_writehandler(address))->writeb(address,val);
}
static INLINE void mem_writew_inline(PhysPt address,Bit16u val) {
if ((address & 0xfff)<0xfff) {
HostPt tlb_addr=get_tlb_write(address);
if (tlb_addr) host_writew(tlb_addr+address,val);
else (get_tlb_writehandler(address))->writew(address,val);
} else mem_unalignedwritew(address,val);
}
static INLINE void mem_writed_inline(PhysPt address,Bit32u val) {
if ((address & 0xfff)<0xffd) {
HostPt tlb_addr=get_tlb_write(address);
if (tlb_addr) host_writed(tlb_addr+address,val);
else (get_tlb_writehandler(address))->writed(address,val);
} else mem_unalignedwrited(address,val);
}
static INLINE bool mem_readb_checked(PhysPt address, Bit8u * val) {
HostPt tlb_addr=get_tlb_read(address);
if (tlb_addr) {
*val=host_readb(tlb_addr+address);
return false;
} else return (get_tlb_readhandler(address))->readb_checked(address, val);
}
static INLINE bool mem_readw_checked(PhysPt address, Bit16u * val) {
if ((address & 0xfff)<0xfff) {
HostPt tlb_addr=get_tlb_read(address);
if (tlb_addr) {
*val=host_readw(tlb_addr+address);
return false;
} else return (get_tlb_readhandler(address))->readw_checked(address, val);
} else return mem_unalignedreadw_checked(address, val);
}
static INLINE bool mem_readd_checked(PhysPt address, Bit32u * val) {
if ((address & 0xfff)<0xffd) {
HostPt tlb_addr=get_tlb_read(address);
if (tlb_addr) {
*val=host_readd(tlb_addr+address);
return false;
} else return (get_tlb_readhandler(address))->readd_checked(address, val);
} else return mem_unalignedreadd_checked(address, val);
}
static INLINE bool mem_writeb_checked(PhysPt address,Bit8u val) {
HostPt tlb_addr=get_tlb_write(address);
if (tlb_addr) {
host_writeb(tlb_addr+address,val);
return false;
} else return (get_tlb_writehandler(address))->writeb_checked(address,val);
}
static INLINE bool mem_writew_checked(PhysPt address,Bit16u val) {
if ((address & 0xfff)<0xfff) {
HostPt tlb_addr=get_tlb_write(address);
if (tlb_addr) {
host_writew(tlb_addr+address,val);
return false;
} else return (get_tlb_writehandler(address))->writew_checked(address,val);
} else return mem_unalignedwritew_checked(address,val);
}
static INLINE bool mem_writed_checked(PhysPt address,Bit32u val) {
if ((address & 0xfff)<0xffd) {
HostPt tlb_addr=get_tlb_write(address);
if (tlb_addr) {
host_writed(tlb_addr+address,val);
return false;
} else return (get_tlb_writehandler(address))->writed_checked(address,val);
} else return mem_unalignedwrited_checked(address,val);
}
#endif