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dosbox-wii/src/cpu/paging.cpp

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2021-02-06 09:39:32 +01:00
/*
* Copyright (C) 2002-2011 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.
*/
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "dosbox.h"
#include "mem.h"
#include "paging.h"
#include "regs.h"
#include "lazyflags.h"
#include "cpu.h"
#include "debug.h"
#include "setup.h"
#define LINK_TOTAL (64*1024)
#define USERWRITE_PROHIBITED ((cpu.cpl&cpu.mpl)==3)
PagingBlock paging;
Bitu PageHandler::readb(PhysPt addr) {
E_Exit("No byte handler for read from %d",addr);
return 0;
}
Bitu PageHandler::readw(PhysPt addr) {
Bitu ret = (readb(addr+0) << 0);
ret |= (readb(addr+1) << 8);
return ret;
}
Bitu PageHandler::readd(PhysPt addr) {
Bitu ret = (readb(addr+0) << 0);
ret |= (readb(addr+1) << 8);
ret |= (readb(addr+2) << 16);
ret |= (readb(addr+3) << 24);
return ret;
}
void PageHandler::writeb(PhysPt addr,Bitu /*val*/) {
E_Exit("No byte handler for write to %d",addr);
}
void PageHandler::writew(PhysPt addr,Bitu val) {
writeb(addr+0,(Bit8u) (val >> 0));
writeb(addr+1,(Bit8u) (val >> 8));
}
void PageHandler::writed(PhysPt addr,Bitu val) {
writeb(addr+0,(Bit8u) (val >> 0));
writeb(addr+1,(Bit8u) (val >> 8));
writeb(addr+2,(Bit8u) (val >> 16));
writeb(addr+3,(Bit8u) (val >> 24));
}
HostPt PageHandler::GetHostReadPt(Bitu /*phys_page*/) {
return 0;
}
HostPt PageHandler::GetHostWritePt(Bitu /*phys_page*/) {
return 0;
}
bool PageHandler::readb_checked(PhysPt addr, Bit8u * val) {
*val=(Bit8u)readb(addr); return false;
}
bool PageHandler::readw_checked(PhysPt addr, Bit16u * val) {
*val=(Bit16u)readw(addr); return false;
}
bool PageHandler::readd_checked(PhysPt addr, Bit32u * val) {
*val=(Bit32u)readd(addr); return false;
}
bool PageHandler::writeb_checked(PhysPt addr,Bitu val) {
writeb(addr,val); return false;
}
bool PageHandler::writew_checked(PhysPt addr,Bitu val) {
writew(addr,val); return false;
}
bool PageHandler::writed_checked(PhysPt addr,Bitu val) {
writed(addr,val); return false;
}
struct PF_Entry {
Bitu cs;
Bitu eip;
Bitu page_addr;
Bitu mpl;
};
#define PF_QUEUESIZE 16
static struct {
Bitu used;
PF_Entry entries[PF_QUEUESIZE];
} pf_queue;
static Bits PageFaultCore(void) {
CPU_CycleLeft+=CPU_Cycles;
CPU_Cycles=1;
Bits ret=CPU_Core_Full_Run();
CPU_CycleLeft+=CPU_Cycles;
if (ret<0) E_Exit("Got a dosbox close machine in pagefault core?");
if (ret)
return ret;
if (!pf_queue.used) E_Exit("PF Core without PF");
PF_Entry * entry=&pf_queue.entries[pf_queue.used-1];
X86PageEntry pentry;
pentry.load=phys_readd(entry->page_addr);
if (pentry.block.p && entry->cs == SegValue(cs) && entry->eip==reg_eip) {
cpu.mpl=entry->mpl;
return -1;
}
return 0;
}
#if C_DEBUG
Bitu DEBUG_EnableDebugger(void);
#endif
bool first=false;
void PAGING_PageFault(PhysPt lin_addr,Bitu page_addr,Bitu faultcode) {
/* Save the state of the cpu cores */
LazyFlags old_lflags;
memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
CPU_Decoder * old_cpudecoder;
old_cpudecoder=cpudecoder;
cpudecoder=&PageFaultCore;
paging.cr2=lin_addr;
PF_Entry * entry=&pf_queue.entries[pf_queue.used++];
LOG(LOG_PAGING,LOG_NORMAL)("PageFault at %X type [%x] queue %d",lin_addr,faultcode,pf_queue.used);
// LOG_MSG("EAX:%04X ECX:%04X EDX:%04X EBX:%04X",reg_eax,reg_ecx,reg_edx,reg_ebx);
// LOG_MSG("CS:%04X EIP:%08X SS:%04x SP:%08X",SegValue(cs),reg_eip,SegValue(ss),reg_esp);
entry->cs=SegValue(cs);
entry->eip=reg_eip;
entry->page_addr=page_addr;
entry->mpl=cpu.mpl;
cpu.mpl=3;
CPU_Exception(EXCEPTION_PF,faultcode);
#if C_DEBUG
// DEBUG_EnableDebugger();
#endif
DOSBOX_RunMachine();
pf_queue.used--;
LOG(LOG_PAGING,LOG_NORMAL)("Left PageFault for %x queue %d",lin_addr,pf_queue.used);
memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
cpudecoder=old_cpudecoder;
// LOG_MSG("SS:%04x SP:%08X",SegValue(ss),reg_esp);
}
static INLINE void InitPageUpdateLink(Bitu relink,PhysPt addr) {
if (relink==0) return;
if (paging.links.used) {
if (paging.links.entries[paging.links.used-1]==(addr>>12)) {
paging.links.used--;
PAGING_UnlinkPages(addr>>12,1);
}
}
if (relink>1) PAGING_LinkPage_ReadOnly(addr>>12,relink);
}
static INLINE void InitPageCheckPresence(PhysPt lin_addr,bool writing,X86PageEntry& table,X86PageEntry& entry) {
Bitu lin_page=lin_addr >> 12;
Bitu d_index=lin_page >> 10;
Bitu t_index=lin_page & 0x3ff;
Bitu table_addr=(paging.base.page<<12)+d_index*4;
table.load=phys_readd(table_addr);
if (!table.block.p) {
LOG(LOG_PAGING,LOG_NORMAL)("NP Table");
PAGING_PageFault(lin_addr,table_addr,
(writing?0x02:0x00) | (((cpu.cpl&cpu.mpl)==0)?0x00:0x04));
table.load=phys_readd(table_addr);
if (GCC_UNLIKELY(!table.block.p))
E_Exit("Pagefault didn't correct table");
}
Bitu entry_addr=(table.block.base<<12)+t_index*4;
entry.load=phys_readd(entry_addr);
if (!entry.block.p) {
// LOG(LOG_PAGING,LOG_NORMAL)("NP Page");
PAGING_PageFault(lin_addr,entry_addr,
(writing?0x02:0x00) | (((cpu.cpl&cpu.mpl)==0)?0x00:0x04));
entry.load=phys_readd(entry_addr);
if (GCC_UNLIKELY(!entry.block.p))
E_Exit("Pagefault didn't correct page");
}
}
static INLINE bool InitPageCheckPresence_CheckOnly(PhysPt lin_addr,bool writing,X86PageEntry& table,X86PageEntry& entry) {
Bitu lin_page=lin_addr >> 12;
Bitu d_index=lin_page >> 10;
Bitu t_index=lin_page & 0x3ff;
Bitu table_addr=(paging.base.page<<12)+d_index*4;
table.load=phys_readd(table_addr);
if (!table.block.p) {
paging.cr2=lin_addr;
cpu.exception.which=EXCEPTION_PF;
cpu.exception.error=(writing?0x02:0x00) | (((cpu.cpl&cpu.mpl)==0)?0x00:0x04);
return false;
}
Bitu entry_addr=(table.block.base<<12)+t_index*4;
entry.load=phys_readd(entry_addr);
if (!entry.block.p) {
paging.cr2=lin_addr;
cpu.exception.which=EXCEPTION_PF;
cpu.exception.error=(writing?0x02:0x00) | (((cpu.cpl&cpu.mpl)==0)?0x00:0x04);
return false;
}
return true;
}
// check if a user-level memory access would trigger a privilege page fault
static INLINE bool InitPage_CheckUseraccess(Bitu u1,Bitu u2) {
switch (CPU_ArchitectureType) {
case CPU_ARCHTYPE_MIXED:
case CPU_ARCHTYPE_386SLOW:
case CPU_ARCHTYPE_386FAST:
default:
return ((u1)==0) && ((u2)==0);
case CPU_ARCHTYPE_486OLDSLOW:
case CPU_ARCHTYPE_486NEWSLOW:
case CPU_ARCHTYPE_PENTIUMSLOW:
return ((u1)==0) || ((u2)==0);
}
}
class InitPageHandler : public PageHandler {
public:
InitPageHandler() {
flags=PFLAG_INIT|PFLAG_NOCODE;
}
Bitu readb(PhysPt addr) {
Bitu needs_reset=InitPage(addr,false);
Bit8u val=mem_readb(addr);
InitPageUpdateLink(needs_reset,addr);
return val;
}
Bitu readw(PhysPt addr) {
Bitu needs_reset=InitPage(addr,false);
Bit16u val=mem_readw(addr);
InitPageUpdateLink(needs_reset,addr);
return val;
}
Bitu readd(PhysPt addr) {
Bitu needs_reset=InitPage(addr,false);
Bit32u val=mem_readd(addr);
InitPageUpdateLink(needs_reset,addr);
return val;
}
void writeb(PhysPt addr,Bitu val) {
Bitu needs_reset=InitPage(addr,true);
mem_writeb(addr,val);
InitPageUpdateLink(needs_reset,addr);
}
void writew(PhysPt addr,Bitu val) {
Bitu needs_reset=InitPage(addr,true);
mem_writew(addr,val);
InitPageUpdateLink(needs_reset,addr);
}
void writed(PhysPt addr,Bitu val) {
Bitu needs_reset=InitPage(addr,true);
mem_writed(addr,val);
InitPageUpdateLink(needs_reset,addr);
}
bool readb_checked(PhysPt addr, Bit8u * val) {
if (InitPageCheckOnly(addr,false)) {
*val=mem_readb(addr);
return false;
} else return true;
}
bool readw_checked(PhysPt addr, Bit16u * val) {
if (InitPageCheckOnly(addr,false)){
*val=mem_readw(addr);
return false;
} else return true;
}
bool readd_checked(PhysPt addr, Bit32u * val) {
if (InitPageCheckOnly(addr,false)) {
*val=mem_readd(addr);
return false;
} else return true;
}
bool writeb_checked(PhysPt addr,Bitu val) {
if (InitPageCheckOnly(addr,true)) {
mem_writeb(addr,val);
return false;
} else return true;
}
bool writew_checked(PhysPt addr,Bitu val) {
if (InitPageCheckOnly(addr,true)) {
mem_writew(addr,val);
return false;
} else return true;
}
bool writed_checked(PhysPt addr,Bitu val) {
if (InitPageCheckOnly(addr,true)) {
mem_writed(addr,val);
return false;
} else return true;
}
Bitu InitPage(Bitu lin_addr,bool writing) {
Bitu lin_page=lin_addr >> 12;
Bitu phys_page;
if (paging.enabled) {
X86PageEntry table;
X86PageEntry entry;
InitPageCheckPresence(lin_addr,writing,table,entry);
// 0: no action
// 1: can (but currently does not) fail a user-level access privilege check
// 2: can (but currently does not) fail a write privilege check
// 3: fails a privilege check
Bitu priv_check=0;
if (InitPage_CheckUseraccess(entry.block.us,table.block.us)) {
if ((cpu.cpl&cpu.mpl)==3) priv_check=3;
else {
switch (CPU_ArchitectureType) {
case CPU_ARCHTYPE_MIXED:
case CPU_ARCHTYPE_386FAST:
default:
// priv_check=0; // default
break;
case CPU_ARCHTYPE_386SLOW:
case CPU_ARCHTYPE_486OLDSLOW:
case CPU_ARCHTYPE_486NEWSLOW:
case CPU_ARCHTYPE_PENTIUMSLOW:
priv_check=1;
break;
}
}
}
if ((entry.block.wr==0) || (table.block.wr==0)) {
// page is write-protected for user mode
if (priv_check==0) {
switch (CPU_ArchitectureType) {
case CPU_ARCHTYPE_MIXED:
case CPU_ARCHTYPE_386FAST:
default:
// priv_check=0; // default
break;
case CPU_ARCHTYPE_386SLOW:
case CPU_ARCHTYPE_486OLDSLOW:
case CPU_ARCHTYPE_486NEWSLOW:
case CPU_ARCHTYPE_PENTIUMSLOW:
priv_check=2;
break;
}
}
// check if actually failing the write-protected check
if (writing && USERWRITE_PROHIBITED) priv_check=3;
}
if (priv_check==3) {
LOG(LOG_PAGING,LOG_NORMAL)("Page access denied: cpl=%i, %x:%x:%x:%x",
cpu.cpl,entry.block.us,table.block.us,entry.block.wr,table.block.wr);
PAGING_PageFault(lin_addr,(table.block.base<<12)+(lin_page & 0x3ff)*4,0x05 | (writing?0x02:0x00));
priv_check=0;
}
if (!table.block.a) {
table.block.a=1; // set page table accessed
phys_writed((paging.base.page<<12)+(lin_page >> 10)*4,table.load);
}
if ((!entry.block.a) || (!entry.block.d)) {
entry.block.a=1; // set page accessed
// page is dirty if we're writing to it, or if we're reading but the
// page will be fully linked so we can't track later writes
if (writing || (priv_check==0)) entry.block.d=1; // mark page as dirty
phys_writed((table.block.base<<12)+(lin_page & 0x3ff)*4,entry.load);
}
phys_page=entry.block.base;
// now see how the page should be linked best, if we need to catch privilege
// checks later on it should be linked as read-only page
if (priv_check==0) {
// if reading we could link the page as read-only to later cacth writes,
// will slow down pretty much but allows catching all dirty events
PAGING_LinkPage(lin_page,phys_page);
} else {
if (priv_check==1) {
PAGING_LinkPage(lin_page,phys_page);
return 1;
} else if (writing) {
PageHandler * handler=MEM_GetPageHandler(phys_page);
PAGING_LinkPage(lin_page,phys_page);
if (!(handler->flags & PFLAG_READABLE)) return 1;
if (!(handler->flags & PFLAG_WRITEABLE)) return 1;
if (get_tlb_read(lin_addr)!=get_tlb_write(lin_addr)) return 1;
if (phys_page>1) return phys_page;
else return 1;
} else {
PAGING_LinkPage_ReadOnly(lin_page,phys_page);
}
}
} else {
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
PAGING_LinkPage(lin_page,phys_page);
}
return 0;
}
bool InitPageCheckOnly(Bitu lin_addr,bool writing) {
Bitu lin_page=lin_addr >> 12;
if (paging.enabled) {
X86PageEntry table;
X86PageEntry entry;
if (!InitPageCheckPresence_CheckOnly(lin_addr,writing,table,entry)) return false;
if (!USERWRITE_PROHIBITED) return true;
if (InitPage_CheckUseraccess(entry.block.us,table.block.us) ||
(((entry.block.wr==0) || (table.block.wr==0)) && writing)) {
LOG(LOG_PAGING,LOG_NORMAL)("Page access denied: cpl=%i, %x:%x:%x:%x",
cpu.cpl,entry.block.us,table.block.us,entry.block.wr,table.block.wr);
paging.cr2=lin_addr;
cpu.exception.which=EXCEPTION_PF;
cpu.exception.error=0x05 | (writing?0x02:0x00);
return false;
}
} else {
Bitu phys_page;
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
PAGING_LinkPage(lin_page,phys_page);
}
return true;
}
void InitPageForced(Bitu lin_addr) {
Bitu lin_page=lin_addr >> 12;
Bitu phys_page;
if (paging.enabled) {
X86PageEntry table;
X86PageEntry entry;
InitPageCheckPresence(lin_addr,false,table,entry);
if (!table.block.a) {
table.block.a=1; //Set access
phys_writed((paging.base.page<<12)+(lin_page >> 10)*4,table.load);
}
if (!entry.block.a) {
entry.block.a=1; //Set access
phys_writed((table.block.base<<12)+(lin_page & 0x3ff)*4,entry.load);
}
phys_page=entry.block.base;
// maybe use read-only page here if possible
} else {
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
}
PAGING_LinkPage(lin_page,phys_page);
}
};
class InitPageUserROHandler : public PageHandler {
public:
InitPageUserROHandler() {
flags=PFLAG_INIT|PFLAG_NOCODE;
}
void writeb(PhysPt addr,Bitu val) {
InitPage(addr,(Bit8u)(val&0xff));
host_writeb(get_tlb_read(addr)+addr,(Bit8u)(val&0xff));
}
void writew(PhysPt addr,Bitu val) {
InitPage(addr,(Bit16u)(val&0xffff));
host_writew(get_tlb_read(addr)+addr,(Bit16u)(val&0xffff));
}
void writed(PhysPt addr,Bitu val) {
InitPage(addr,(Bit32u)val);
host_writed(get_tlb_read(addr)+addr,(Bit32u)val);
}
bool writeb_checked(PhysPt addr,Bitu val) {
Bitu writecode=InitPageCheckOnly(addr,(Bit8u)(val&0xff));
if (writecode) {
HostPt tlb_addr;
if (writecode>1) tlb_addr=get_tlb_read(addr);
else tlb_addr=get_tlb_write(addr);
host_writeb(tlb_addr+addr,(Bit8u)(val&0xff));
return false;
}
return true;
}
bool writew_checked(PhysPt addr,Bitu val) {
Bitu writecode=InitPageCheckOnly(addr,(Bit16u)(val&0xffff));
if (writecode) {
HostPt tlb_addr;
if (writecode>1) tlb_addr=get_tlb_read(addr);
else tlb_addr=get_tlb_write(addr);
host_writew(tlb_addr+addr,(Bit16u)(val&0xffff));
return false;
}
return true;
}
bool writed_checked(PhysPt addr,Bitu val) {
Bitu writecode=InitPageCheckOnly(addr,(Bit32u)val);
if (writecode) {
HostPt tlb_addr;
if (writecode>1) tlb_addr=get_tlb_read(addr);
else tlb_addr=get_tlb_write(addr);
host_writed(tlb_addr+addr,(Bit32u)val);
return false;
}
return true;
}
void InitPage(Bitu lin_addr,Bitu val) {
Bitu lin_page=lin_addr >> 12;
Bitu phys_page;
if (paging.enabled) {
if (!USERWRITE_PROHIBITED) return;
X86PageEntry table;
X86PageEntry entry;
InitPageCheckPresence(lin_addr,true,table,entry);
LOG(LOG_PAGING,LOG_NORMAL)("Page access denied: cpl=%i, %x:%x:%x:%x",
cpu.cpl,entry.block.us,table.block.us,entry.block.wr,table.block.wr);
PAGING_PageFault(lin_addr,(table.block.base<<12)+(lin_page & 0x3ff)*4,0x07);
if (!table.block.a) {
table.block.a=1; //Set access
phys_writed((paging.base.page<<12)+(lin_page >> 10)*4,table.load);
}
if ((!entry.block.a) || (!entry.block.d)) {
entry.block.a=1; //Set access
entry.block.d=1; //Set dirty
phys_writed((table.block.base<<12)+(lin_page & 0x3ff)*4,entry.load);
}
phys_page=entry.block.base;
PAGING_LinkPage(lin_page,phys_page);
} else {
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
PAGING_LinkPage(lin_page,phys_page);
}
}
Bitu InitPageCheckOnly(Bitu lin_addr,Bitu val) {
Bitu lin_page=lin_addr >> 12;
if (paging.enabled) {
if (!USERWRITE_PROHIBITED) return 2;
X86PageEntry table;
X86PageEntry entry;
if (!InitPageCheckPresence_CheckOnly(lin_addr,true,table,entry)) return 0;
if (InitPage_CheckUseraccess(entry.block.us,table.block.us) || (((entry.block.wr==0) || (table.block.wr==0)))) {
LOG(LOG_PAGING,LOG_NORMAL)("Page access denied: cpl=%i, %x:%x:%x:%x",
cpu.cpl,entry.block.us,table.block.us,entry.block.wr,table.block.wr);
paging.cr2=lin_addr;
cpu.exception.which=EXCEPTION_PF;
cpu.exception.error=0x07;
return 0;
}
PAGING_LinkPage(lin_page,entry.block.base);
} else {
Bitu phys_page;
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
PAGING_LinkPage(lin_page,phys_page);
}
return 1;
}
void InitPageForced(Bitu lin_addr) {
Bitu lin_page=lin_addr >> 12;
Bitu phys_page;
if (paging.enabled) {
X86PageEntry table;
X86PageEntry entry;
InitPageCheckPresence(lin_addr,true,table,entry);
if (!table.block.a) {
table.block.a=1; //Set access
phys_writed((paging.base.page<<12)+(lin_page >> 10)*4,table.load);
}
if (!entry.block.a) {
entry.block.a=1; //Set access
phys_writed((table.block.base<<12)+(lin_page & 0x3ff)*4,entry.load);
}
phys_page=entry.block.base;
} else {
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
}
PAGING_LinkPage(lin_page,phys_page);
}
};
bool PAGING_MakePhysPage(Bitu & page) {
if (paging.enabled) {
Bitu d_index=page >> 10;
Bitu t_index=page & 0x3ff;
X86PageEntry table;
table.load=phys_readd((paging.base.page<<12)+d_index*4);
if (!table.block.p) return false;
X86PageEntry entry;
entry.load=phys_readd((table.block.base<<12)+t_index*4);
if (!entry.block.p) return false;
page=entry.block.base;
} else {
if (page<LINK_START) page=paging.firstmb[page];
//Else keep it the same
}
return true;
}
static InitPageHandler init_page_handler;
static InitPageUserROHandler init_page_handler_userro;
Bitu PAGING_GetDirBase(void) {
return paging.cr3;
}
bool PAGING_ForcePageInit(Bitu lin_addr) {
PageHandler * handler=get_tlb_readhandler(lin_addr);
if (handler==&init_page_handler) {
init_page_handler.InitPageForced(lin_addr);
return true;
} else if (handler==&init_page_handler_userro) {
PAGING_UnlinkPages(lin_addr>>12,1);
init_page_handler_userro.InitPageForced(lin_addr);
return true;
}
return false;
}
#if defined(USE_FULL_TLB)
void PAGING_InitTLB(void) {
for (Bitu i=0;i<TLB_SIZE;i++) {
paging.tlb.read[i]=0;
paging.tlb.write[i]=0;
paging.tlb.readhandler[i]=&init_page_handler;
paging.tlb.writehandler[i]=&init_page_handler;
}
paging.links.used=0;
}
void PAGING_ClearTLB(void) {
Bit32u * entries=&paging.links.entries[0];
for (;paging.links.used>0;paging.links.used--) {
Bitu page=*entries++;
paging.tlb.read[page]=0;
paging.tlb.write[page]=0;
paging.tlb.readhandler[page]=&init_page_handler;
paging.tlb.writehandler[page]=&init_page_handler;
}
paging.links.used=0;
}
void PAGING_UnlinkPages(Bitu lin_page,Bitu pages) {
for (;pages>0;pages--) {
paging.tlb.read[lin_page]=0;
paging.tlb.write[lin_page]=0;
paging.tlb.readhandler[lin_page]=&init_page_handler;
paging.tlb.writehandler[lin_page]=&init_page_handler;
lin_page++;
}
}
void PAGING_MapPage(Bitu lin_page,Bitu phys_page) {
if (lin_page<LINK_START) {
paging.firstmb[lin_page]=phys_page;
paging.tlb.read[lin_page]=0;
paging.tlb.write[lin_page]=0;
paging.tlb.readhandler[lin_page]=&init_page_handler;
paging.tlb.writehandler[lin_page]=&init_page_handler;
} else {
PAGING_LinkPage(lin_page,phys_page);
}
}
void PAGING_LinkPage(Bitu lin_page,Bitu phys_page) {
PageHandler * handler=MEM_GetPageHandler(phys_page);
Bitu lin_base=lin_page << 12;
if (lin_page>=TLB_SIZE || phys_page>=TLB_SIZE)
E_Exit("Illegal page");
if (paging.links.used>=PAGING_LINKS) {
LOG(LOG_PAGING,LOG_NORMAL)("Not enough paging links, resetting cache");
PAGING_ClearTLB();
}
paging.tlb.phys_page[lin_page]=phys_page;
if (handler->flags & PFLAG_READABLE) paging.tlb.read[lin_page]=handler->GetHostReadPt(phys_page)-lin_base;
else paging.tlb.read[lin_page]=0;
if (handler->flags & PFLAG_WRITEABLE) paging.tlb.write[lin_page]=handler->GetHostWritePt(phys_page)-lin_base;
else paging.tlb.write[lin_page]=0;
paging.links.entries[paging.links.used++]=lin_page;
paging.tlb.readhandler[lin_page]=handler;
paging.tlb.writehandler[lin_page]=handler;
}
void PAGING_LinkPage_ReadOnly(Bitu lin_page,Bitu phys_page) {
PageHandler * handler=MEM_GetPageHandler(phys_page);
Bitu lin_base=lin_page << 12;
if (lin_page>=TLB_SIZE || phys_page>=TLB_SIZE)
E_Exit("Illegal page");
if (paging.links.used>=PAGING_LINKS) {
LOG(LOG_PAGING,LOG_NORMAL)("Not enough paging links, resetting cache");
PAGING_ClearTLB();
}
paging.tlb.phys_page[lin_page]=phys_page;
if (handler->flags & PFLAG_READABLE) paging.tlb.read[lin_page]=handler->GetHostReadPt(phys_page)-lin_base;
else paging.tlb.read[lin_page]=0;
paging.tlb.write[lin_page]=0;
paging.links.entries[paging.links.used++]=lin_page;
paging.tlb.readhandler[lin_page]=handler;
paging.tlb.writehandler[lin_page]=&init_page_handler_userro;
}
#else
static INLINE void InitTLBInt(tlb_entry *bank) {
for (Bitu i=0;i<TLB_SIZE;i++) {
bank[i].read=0;
bank[i].write=0;
bank[i].readhandler=&init_page_handler;
bank[i].writehandler=&init_page_handler;
}
}
void PAGING_InitTLBBank(tlb_entry **bank) {
*bank = (tlb_entry *)malloc(sizeof(tlb_entry)*TLB_SIZE);
if(!*bank) E_Exit("Out of Memory");
InitTLBInt(*bank);
}
void PAGING_InitTLB(void) {
InitTLBInt(paging.tlbh);
paging.links.used=0;
}
void PAGING_ClearTLB(void) {
Bit32u * entries=&paging.links.entries[0];
for (;paging.links.used>0;paging.links.used--) {
Bitu page=*entries++;
tlb_entry *entry = get_tlb_entry(page<<12);
entry->read=0;
entry->write=0;
entry->readhandler=&init_page_handler;
entry->writehandler=&init_page_handler;
}
paging.links.used=0;
}
void PAGING_UnlinkPages(Bitu lin_page,Bitu pages) {
for (;pages>0;pages--) {
tlb_entry *entry = get_tlb_entry(lin_page<<12);
entry->read=0;
entry->write=0;
entry->readhandler=&init_page_handler;
entry->writehandler=&init_page_handler;
lin_page++;
}
}
void PAGING_MapPage(Bitu lin_page,Bitu phys_page) {
if (lin_page<LINK_START) {
paging.firstmb[lin_page]=phys_page;
paging.tlbh[lin_page].read=0;
paging.tlbh[lin_page].write=0;
paging.tlbh[lin_page].readhandler=&init_page_handler;
paging.tlbh[lin_page].writehandler=&init_page_handler;
} else {
PAGING_LinkPage(lin_page,phys_page);
}
}
void PAGING_LinkPage(Bitu lin_page,Bitu phys_page) {
PageHandler * handler=MEM_GetPageHandler(phys_page);
Bitu lin_base=lin_page << 12;
if (lin_page>=(TLB_SIZE*(TLB_BANKS+1)) || phys_page>=(TLB_SIZE*(TLB_BANKS+1)))
E_Exit("Illegal page");
if (paging.links.used>=PAGING_LINKS) {
LOG(LOG_PAGING,LOG_NORMAL)("Not enough paging links, resetting cache");
PAGING_ClearTLB();
}
tlb_entry *entry = get_tlb_entry(lin_base);
entry->phys_page=phys_page;
if (handler->flags & PFLAG_READABLE) entry->read=handler->GetHostReadPt(phys_page)-lin_base;
else entry->read=0;
if (handler->flags & PFLAG_WRITEABLE) entry->write=handler->GetHostWritePt(phys_page)-lin_base;
else entry->write=0;
paging.links.entries[paging.links.used++]=lin_page;
entry->readhandler=handler;
entry->writehandler=handler;
}
void PAGING_LinkPage_ReadOnly(Bitu lin_page,Bitu phys_page) {
PageHandler * handler=MEM_GetPageHandler(phys_page);
Bitu lin_base=lin_page << 12;
if (lin_page>=(TLB_SIZE*(TLB_BANKS+1)) || phys_page>=(TLB_SIZE*(TLB_BANKS+1)))
E_Exit("Illegal page");
if (paging.links.used>=PAGING_LINKS) {
LOG(LOG_PAGING,LOG_NORMAL)("Not enough paging links, resetting cache");
PAGING_ClearTLB();
}
tlb_entry *entry = get_tlb_entry(lin_base);
entry->phys_page=phys_page;
if (handler->flags & PFLAG_READABLE) entry->read=handler->GetHostReadPt(phys_page)-lin_base;
else entry->read=0;
entry->write=0;
paging.links.entries[paging.links.used++]=lin_page;
entry->readhandler=handler;
entry->writehandler=&init_page_handler_userro;
}
#endif
void PAGING_SetDirBase(Bitu cr3) {
paging.cr3=cr3;
paging.base.page=cr3 >> 12;
paging.base.addr=cr3 & ~4095;
// LOG(LOG_PAGING,LOG_NORMAL)("CR3:%X Base %X",cr3,paging.base.page);
if (paging.enabled) {
PAGING_ClearTLB();
}
}
void PAGING_Enable(bool enabled) {
/* If paging is disabled, we work from a default paging table */
if (paging.enabled==enabled) return;
paging.enabled=enabled;
if (enabled) {
if (GCC_UNLIKELY(cpudecoder==CPU_Core_Simple_Run)) {
// LOG_MSG("CPU core simple won't run this game,switching to normal");
cpudecoder=CPU_Core_Normal_Run;
CPU_CycleLeft+=CPU_Cycles;
CPU_Cycles=0;
}
// LOG(LOG_PAGING,LOG_NORMAL)("Enabled");
PAGING_SetDirBase(paging.cr3);
}
PAGING_ClearTLB();
}
bool PAGING_Enabled(void) {
return paging.enabled;
}
class PAGING:public Module_base{
public:
PAGING(Section* configuration):Module_base(configuration){
/* Setup default Page Directory, force it to update */
paging.enabled=false;
PAGING_InitTLB();
Bitu i;
for (i=0;i<LINK_START;i++) {
paging.firstmb[i]=i;
}
pf_queue.used=0;
}
~PAGING(){}
};
static PAGING* test;
void PAGING_Init(Section * sec) {
test = new PAGING(sec);
}
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