dosbox-wii/include/mem.h

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/*
* Copyright (C) 2002 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 Library 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.
*/
#if !defined __MEM_H
#define __MEM_H
#include <dosbox.h>
#define bmemcpy(mem1,mem2,size) memcpy((void *)mem1,(void *)mem2,size)
typedef Bit32u PhysPt;
typedef Bit8u * HostPt;
typedef Bit32u RealPt;
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typedef Bit8u (*MEMORY_ReadHandler)(PhysPt pt);
typedef void (*MEMORY_WriteHandler)(PhysPt pt,Bit8u val);
#define PAGE_KB 16
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#define PAGE_SIZE (PAGE_KB*1024)
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#define PAGE_SHIFT 14
#define PAGE_COUNT(A) (A & ((1 << PAGE_SHIFT)-1) ? 1+(A >> PAGE_SHIFT) : (A >> PAGE_SHIFT) )
#define MAX_PAGES PAGE_COUNT(C_MEM_MAX_SIZE*1024*1024)
extern HostPt ReadHostTable[MAX_PAGES];
extern HostPt WriteHostTable[MAX_PAGES];
extern MEMORY_ReadHandler ReadHandlerTable[MAX_PAGES];
extern MEMORY_WriteHandler WriteHandlerTable[MAX_PAGES];
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INLINE Bit16u PAGES(Bit32u bytes) {
if ((bytes & 4095) == 0) return (Bit16u)(bytes>>12);
return (Bit16u)(1+(bytes>>12));
}
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void MEM_SetupPageHandlers(Bitu startpage,Bitu pages,MEMORY_ReadHandler read,MEMORY_WriteHandler write);
void MEM_ClearPageHandlers(Bitu startpage,Bitu pages);
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void MEM_SetupMapping(Bitu startpage,Bitu pages,void * data);
void MEM_ClearMapping(Bitu startpage,Bitu pages);
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extern HostPt memory;
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/*
The folowing six functions are used everywhere in the end so these should be changed for
Working on big or little endian machines
*/
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INLINE Bit8u readb(HostPt off) {
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return *(Bit8u *)off;
};
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INLINE Bit16u readw(HostPt off) {
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return *(Bit16u *)off;
};
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INLINE Bit32u readd(HostPt off) {
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return *(Bit32u *)off;
};
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INLINE void writeb(HostPt off,Bit8u val) {
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*(Bit8u *)(off)=val;
};
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INLINE void writew(HostPt off,Bit16u val) {
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*(Bit16u *)(off)=val;
};
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INLINE void writed(HostPt off,Bit32u val) {
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*(Bit32u *)(off)=val;
};
/* The Folowing six functions are slower but they recognize the paged memory system */
//TODO maybe make em inline to go a bit faster
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#if (!C_EXTRAINLINE)
Bit8u mem_readb(PhysPt pt);
Bit16u mem_readw(PhysPt pt);
Bit32u mem_readd(PhysPt pt);
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void mem_writeb(PhysPt pt,Bit8u val);
void mem_writew(PhysPt pt,Bit16u val);
void mem_writed(PhysPt pt,Bit32u val);
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#else
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INLINE void mem_writeb(PhysPt pt,Bit8u val) {
if (WriteHostTable[pt >> PAGE_SHIFT]) writeb(WriteHostTable[pt >> PAGE_SHIFT]+pt,val);
else {
WriteHandlerTable[pt >> PAGE_SHIFT](pt,val);
}
}
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INLINE void mem_writew(PhysPt pt,Bit16u val) {
if (WriteHostTable[pt >> PAGE_SHIFT]) writew(WriteHostTable[pt >> PAGE_SHIFT]+pt,val);
else {
WriteHandlerTable[pt >> PAGE_SHIFT](pt+0,(Bit8u)(val & 0xff));
WriteHandlerTable[pt >> PAGE_SHIFT](pt+1,(Bit8u)((val >> 8) & 0xff) );
}
}
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INLINE void mem_writed(PhysPt pt,Bit32u val) {
if (WriteHostTable[pt >> PAGE_SHIFT]) writed(WriteHostTable[pt >> PAGE_SHIFT]+pt,val);
else {
WriteHandlerTable[pt >> PAGE_SHIFT](pt+0,(Bit8u)(val & 0xff));
WriteHandlerTable[pt >> PAGE_SHIFT](pt+1,(Bit8u)((val >> 8) & 0xff) );
WriteHandlerTable[pt >> PAGE_SHIFT](pt+2,(Bit8u)((val >> 16) & 0xff) );
WriteHandlerTable[pt >> PAGE_SHIFT](pt+3,(Bit8u)((val >> 24) & 0xff) );
}
}
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INLINE Bit8u mem_readb(PhysPt pt) {
if (ReadHostTable[pt >> PAGE_SHIFT]) return readb(ReadHostTable[pt >> PAGE_SHIFT]+pt);
else {
return ReadHandlerTable[pt >> PAGE_SHIFT](pt);
}
}
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INLINE Bit16u mem_readw(PhysPt pt) {
if (ReadHostTable[pt >> PAGE_SHIFT]) return readw(ReadHostTable[pt >> PAGE_SHIFT]+pt);
else {
return
(ReadHandlerTable[pt >> PAGE_SHIFT](pt+0)) |
(ReadHandlerTable[pt >> PAGE_SHIFT](pt+1)) << 8;
}
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}
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INLINE Bit32u mem_readd(PhysPt pt){
if (ReadHostTable[pt >> PAGE_SHIFT]) return readd(ReadHostTable[pt >> PAGE_SHIFT]+pt);
else {
return
(ReadHandlerTable[pt >> PAGE_SHIFT](pt+0)) |
(ReadHandlerTable[pt >> PAGE_SHIFT](pt+1)) << 8 |
(ReadHandlerTable[pt >> PAGE_SHIFT](pt+2)) << 16 |
(ReadHandlerTable[pt >> PAGE_SHIFT](pt+3)) << 24;
}
}
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#endif
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void MEM_BlockWrite(PhysPt pt,void * data,Bitu size);
void MEM_BlockRead(PhysPt pt,void * data,Bitu size);
void MEM_BlockCopy(PhysPt dest,PhysPt src,Bitu size);
void MEM_StrCopy(PhysPt pt,char * data,Bitu size);
/* The folowing functions are all shortcuts to the above functions using physical addressing */
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INLINE Bit8u real_readb(Bit16u seg,Bit16u off) {
return mem_readb((seg<<4)+off);
}
INLINE Bit16u real_readw(Bit16u seg,Bit16u off) {
return mem_readw((seg<<4)+off);
}
INLINE Bit32u real_readd(Bit16u seg,Bit16u off) {
return mem_readd((seg<<4)+off);
}
INLINE void real_writeb(Bit16u seg,Bit16u off,Bit8u val) {
mem_writeb(((seg<<4)+off),val);
}
INLINE void real_writew(Bit16u seg,Bit16u off,Bit16u val) {
mem_writew(((seg<<4)+off),val);
}
INLINE void real_writed(Bit16u seg,Bit16u off,Bit32u val) {
mem_writed(((seg<<4)+off),val);
}
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INLINE HostPt HostMake(Bit16u seg,Bit16u off) {
return memory+(seg<<4)+off;
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}
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INLINE HostPt Phys2Host(PhysPt pt) {
return memory+pt;
}
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INLINE Bit16u RealSeg(RealPt pt) {
return (Bit16u)(pt>>16);
}
INLINE Bit16u RealOff(RealPt pt) {
return (Bit16u)(pt&0xffff);
}
INLINE PhysPt Real2Phys(RealPt pt) {
return (RealSeg(pt)<<4) +RealOff(pt);
}
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INLINE PhysPt PhysMake(Bit16u seg,Bit16u off) {
return (seg<<4)+off;
}
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INLINE HostPt Real2Host(RealPt pt) {
return memory+(RealSeg(pt)<<4) +RealOff(pt);
}
INLINE RealPt RealMake(Bit16u seg,Bit16u off) {
return (seg<<16)+off;
}
INLINE void RealSetVec(Bit8u vec,RealPt pt) {
mem_writed(vec<<2,pt);
}
INLINE RealPt RealGetVec(Bit8u vec) {
return mem_readd(vec<<2);
}
#endif