dosbox-wii/include/mem.h
2010-02-18 06:03:55 +00:00

220 lines
5.8 KiB
C

/*
* Copyright (C) 2002-2010 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.
*/
#ifndef DOSBOX_MEM_H
#define DOSBOX_MEM_H
#ifndef DOSBOX_DOSBOX_H
#include "dosbox.h"
#endif
typedef Bit32u PhysPt;
typedef Bit8u * HostPt;
typedef Bit32u RealPt;
typedef Bit32s MemHandle;
#define MEM_PAGESIZE 4096
extern HostPt MemBase;
HostPt GetMemBase(void);
bool MEM_A20_Enabled(void);
void MEM_A20_Enable(bool enable);
/* Memory management / EMS mapping */
HostPt MEM_GetBlockPage(void);
Bitu MEM_FreeTotal(void); //Free 4 kb pages
Bitu MEM_FreeLargest(void); //Largest free 4 kb pages block
Bitu MEM_TotalPages(void); //Total amount of 4 kb pages
Bitu MEM_AllocatedPages(MemHandle handle); // amount of allocated pages of handle
MemHandle MEM_AllocatePages(Bitu pages,bool sequence);
MemHandle MEM_GetNextFreePage(void);
PhysPt MEM_AllocatePage(void);
void MEM_ReleasePages(MemHandle handle);
bool MEM_ReAllocatePages(MemHandle & handle,Bitu pages,bool sequence);
MemHandle MEM_NextHandle(MemHandle handle);
MemHandle MEM_NextHandleAt(MemHandle handle,Bitu where);
/*
The folowing six functions are used everywhere in the end so these should be changed for
Working on big or little endian machines
*/
#if defined(WORDS_BIGENDIAN) || !defined(C_UNALIGNED_MEMORY)
static INLINE Bit8u host_readb(HostPt off) {
return off[0];
}
static INLINE Bit16u host_readw(HostPt off) {
return off[0] | (off[1] << 8);
}
static INLINE Bit32u host_readd(HostPt off) {
return off[0] | (off[1] << 8) | (off[2] << 16) | (off[3] << 24);
}
static INLINE void host_writeb(HostPt off,Bit8u val) {
off[0]=val;
}
static INLINE void host_writew(HostPt off,Bit16u val) {
off[0]=(Bit8u)(val);
off[1]=(Bit8u)(val >> 8);
}
static INLINE void host_writed(HostPt off,Bit32u val) {
off[0]=(Bit8u)(val);
off[1]=(Bit8u)(val >> 8);
off[2]=(Bit8u)(val >> 16);
off[3]=(Bit8u)(val >> 24);
}
#else
static INLINE Bit8u host_readb(HostPt off) {
return *(Bit8u *)off;
}
static INLINE Bit16u host_readw(HostPt off) {
return *(Bit16u *)off;
}
static INLINE Bit32u host_readd(HostPt off) {
return *(Bit32u *)off;
}
static INLINE void host_writeb(HostPt off,Bit8u val) {
*(Bit8u *)(off)=val;
}
static INLINE void host_writew(HostPt off,Bit16u val) {
*(Bit16u *)(off)=val;
}
static INLINE void host_writed(HostPt off,Bit32u val) {
*(Bit32u *)(off)=val;
}
#endif
static INLINE void var_write(Bit8u * var, Bit8u val) {
host_writeb((HostPt)var, val);
}
static INLINE void var_write(Bit16u * var, Bit16u val) {
host_writew((HostPt)var, val);
}
static INLINE void var_write(Bit32u * var, Bit32u val) {
host_writed((HostPt)var, val);
}
/* The Folowing six functions are slower but they recognize the paged memory system */
Bit8u mem_readb(PhysPt pt);
Bit16u mem_readw(PhysPt pt);
Bit32u mem_readd(PhysPt pt);
void mem_writeb(PhysPt pt,Bit8u val);
void mem_writew(PhysPt pt,Bit16u val);
void mem_writed(PhysPt pt,Bit32u val);
static INLINE void phys_writeb(PhysPt addr,Bit8u val) {
host_writeb(MemBase+addr,val);
}
static INLINE void phys_writew(PhysPt addr,Bit16u val){
host_writew(MemBase+addr,val);
}
static INLINE void phys_writed(PhysPt addr,Bit32u val){
host_writed(MemBase+addr,val);
}
static INLINE Bit8u phys_readb(PhysPt addr) {
return host_readb(MemBase+addr);
}
static INLINE Bit16u phys_readw(PhysPt addr){
return host_readw(MemBase+addr);
}
static INLINE Bit32u phys_readd(PhysPt addr){
return host_readd(MemBase+addr);
}
/* These don't check for alignment, better be sure it's correct */
void MEM_BlockWrite(PhysPt pt,void const * const 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);
void mem_memcpy(PhysPt dest,PhysPt src,Bitu size);
Bitu mem_strlen(PhysPt pt);
void mem_strcpy(PhysPt dest,PhysPt src);
/* The folowing functions are all shortcuts to the above functions using physical addressing */
static INLINE Bit8u real_readb(Bit16u seg,Bit16u off) {
return mem_readb((seg<<4)+off);
}
static INLINE Bit16u real_readw(Bit16u seg,Bit16u off) {
return mem_readw((seg<<4)+off);
}
static INLINE Bit32u real_readd(Bit16u seg,Bit16u off) {
return mem_readd((seg<<4)+off);
}
static INLINE void real_writeb(Bit16u seg,Bit16u off,Bit8u val) {
mem_writeb(((seg<<4)+off),val);
}
static INLINE void real_writew(Bit16u seg,Bit16u off,Bit16u val) {
mem_writew(((seg<<4)+off),val);
}
static INLINE void real_writed(Bit16u seg,Bit16u off,Bit32u val) {
mem_writed(((seg<<4)+off),val);
}
static INLINE Bit16u RealSeg(RealPt pt) {
return (Bit16u)(pt>>16);
}
static INLINE Bit16u RealOff(RealPt pt) {
return (Bit16u)(pt&0xffff);
}
static INLINE PhysPt Real2Phys(RealPt pt) {
return (RealSeg(pt)<<4) +RealOff(pt);
}
static INLINE PhysPt PhysMake(Bit16u seg,Bit16u off) {
return (seg<<4)+off;
}
static INLINE RealPt RealMake(Bit16u seg,Bit16u off) {
return (seg<<16)+off;
}
static INLINE void RealSetVec(Bit8u vec,RealPt pt) {
mem_writed(vec<<2,pt);
}
static INLINE void RealSetVec(Bit8u vec,RealPt pt,RealPt &old) {
old = mem_readd(vec<<2);
mem_writed(vec<<2,pt);
}
static INLINE RealPt RealGetVec(Bit8u vec) {
return mem_readd(vec<<2);
}
#endif