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project64/Source/Project64/N64 System/Mips/TLB class.cpp

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/****************************************************************************
* *
* Project 64 - A Nintendo 64 emulator. *
* http://www.pj64-emu.com/ *
* Copyright (C) 2012 Project64. All rights reserved. *
* *
* License: *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html *
* *
****************************************************************************/
#include "stdafx.h"
CTLB::CTLB(CTLB_CB * CallBack ):
m_CB(CallBack)
{
WriteTrace(TraceTLB,__FUNCTION__ ": Start");
memset(m_tlb,0,sizeof(m_tlb));
memset(m_FastTlb,0,sizeof(m_FastTlb));
Reset(true);
WriteTrace(TraceTLB,__FUNCTION__ ": Done");
}
CTLB::~CTLB (void) {
WriteTrace(TraceTLB,__FUNCTION__ ": Start");
WriteTrace(TraceTLB,__FUNCTION__ ": Done");
}
void CTLB::Reset (bool InvalidateTLB) {
DWORD count;
for (count = 0; count < 64; count++)
{
m_FastTlb[count].ValidEntry = false;
}
if (InvalidateTLB)
{
for (count = 0; count < 32; count++)
{
m_tlb[count].EntryDefined = false;
}
} else {
for (count = 0; count < 32; count ++)
{
SetupTLB_Entry(count,false);
}
}
}
bool CTLB::AddressDefined ( DWORD VAddr) {
DWORD i;
if (VAddr >= 0x80000000 && VAddr <= 0xBFFFFFFF) {
return true;
}
for (i = 0; i < 64; i++)
{
if (m_FastTlb[i].ValidEntry &&
VAddr >= m_FastTlb[i].VSTART &&
VAddr <= m_FastTlb[i].VEND)
{
return true;
}
}
return false;
}
void CTLB::Probe (void) {
int Counter;
WriteTrace(TraceTLB,__FUNCTION__ ": Start");
g_Reg->INDEX_REGISTER |= 0x80000000;
for (Counter = 0; Counter < 32; Counter ++)
{
if (!m_tlb[Counter].EntryDefined)
{
continue;
}
DWORD & TlbEntryHiValue = m_tlb[Counter].EntryHi.Value;
DWORD Mask = ~m_tlb[Counter].PageMask.Mask << 13;
DWORD TlbValueMasked = TlbEntryHiValue & Mask;
DWORD EntryHiMasked = g_Reg->ENTRYHI_REGISTER & Mask;
if (TlbValueMasked == EntryHiMasked) {
if ((TlbEntryHiValue & 0x100) != 0 || //Global
((TlbEntryHiValue & 0xFF) == (g_Reg->ENTRYHI_REGISTER & 0xFF))) //SameAsid
{
g_Reg->INDEX_REGISTER = Counter;
int FastIndx = Counter << 1;
m_FastTlb[FastIndx].Probed = true;
m_FastTlb[FastIndx + 1].Probed = true;
return;
}
}
}
WriteTrace(TraceTLB,__FUNCTION__ ": Done");
}
void CTLB::ReadEntry (void) {
DWORD index = g_Reg->INDEX_REGISTER & 0x1F;
g_Reg->PAGE_MASK_REGISTER = m_tlb[index].PageMask.Value ;
g_Reg->ENTRYHI_REGISTER = (m_tlb[index].EntryHi.Value & ~m_tlb[index].PageMask.Value) ;
g_Reg->ENTRYLO0_REGISTER = m_tlb[index].EntryLo0.Value;
g_Reg->ENTRYLO1_REGISTER = m_tlb[index].EntryLo1.Value;
}
void CTLB::WriteEntry (int index, bool Random) {
int FastIndx;
WriteTraceF(TraceTLB,__FUNCTION__ ": %02d %d %08X %08X %08X %08X ",index,Random,g_Reg->PAGE_MASK_REGISTER,g_Reg->ENTRYHI_REGISTER,g_Reg->ENTRYLO0_REGISTER,g_Reg->ENTRYLO1_REGISTER);
//Check to see if entry is unmapping it self
if (m_tlb[index].EntryDefined) {
FastIndx = index << 1;
if (*_PROGRAM_COUNTER >= m_FastTlb[FastIndx].VSTART &&
*_PROGRAM_COUNTER < m_FastTlb[FastIndx].VEND &&
m_FastTlb[FastIndx].ValidEntry && m_FastTlb[FastIndx].VALID)
{
WriteTraceF(TraceTLB,__FUNCTION__ ": Ignored PC: %X VAddr Start: %X VEND: %X",*_PROGRAM_COUNTER,m_FastTlb[FastIndx].VSTART,m_FastTlb[FastIndx].VEND);
return;
}
if (*_PROGRAM_COUNTER >= m_FastTlb[FastIndx + 1].VSTART &&
*_PROGRAM_COUNTER < m_FastTlb[FastIndx + 1].VEND &&
m_FastTlb[FastIndx + 1].ValidEntry && m_FastTlb[FastIndx + 1].VALID)
{
WriteTraceF(TraceTLB,__FUNCTION__ ": Ignored PC: %X VAddr Start: %X VEND: %X",*_PROGRAM_COUNTER,m_FastTlb[FastIndx + 1].VSTART,m_FastTlb[FastIndx + 1].VEND);
return;
}
}
//Reset old addresses
if (m_tlb[index].EntryDefined)
{
for ( FastIndx = index << 1; FastIndx <= (index << 1) + 1; FastIndx++) {
if (!m_FastTlb[FastIndx].ValidEntry) { continue; }
if (!m_FastTlb[FastIndx].VALID) { continue; }
if (m_tlb[index].PageMask.Value == g_Reg->PAGE_MASK_REGISTER &&
m_tlb[index].EntryHi.Value == g_Reg->ENTRYHI_REGISTER)
{
if (FastIndx == (index << 1) && m_tlb[index].EntryLo0.Value == g_Reg->ENTRYLO0_REGISTER) {
continue;
}
if (FastIndx != (index << 1) && m_tlb[index].EntryLo1.Value == g_Reg->ENTRYLO1_REGISTER) {
continue;
}
}
m_CB->TLB_Unmaped(m_FastTlb[FastIndx].VSTART,m_FastTlb[FastIndx].Length);
}
}
//fill in m_tlb entry
m_tlb[index].PageMask.Value = g_Reg->PAGE_MASK_REGISTER;
m_tlb[index].EntryHi.Value = g_Reg->ENTRYHI_REGISTER;
m_tlb[index].EntryLo0.Value = g_Reg->ENTRYLO0_REGISTER;
m_tlb[index].EntryLo1.Value = g_Reg->ENTRYLO1_REGISTER;
m_tlb[index].EntryDefined = true;
SetupTLB_Entry(index,Random);
m_CB->TLB_Changed();
}
void CTLB::SetupTLB_Entry (int index, bool Random) {
//Fix up Fast TLB entries
if (!m_tlb[index].EntryDefined) { return; }
int FastIndx = index << 1;
if (m_FastTlb[FastIndx].VALID)
{
m_CB->TLB_Unmaped(m_FastTlb[FastIndx].VSTART,m_FastTlb[FastIndx].Length);
}
m_FastTlb[FastIndx].Length = (m_tlb[index].PageMask.Mask << 12) + 0xFFF;
m_FastTlb[FastIndx].VSTART=m_tlb[index].EntryHi.VPN2 << 13;
m_FastTlb[FastIndx].VEND = m_FastTlb[FastIndx].VSTART + m_FastTlb[FastIndx].Length;
m_FastTlb[FastIndx].PHYSSTART = m_tlb[index].EntryLo0.PFN << 12;
m_FastTlb[FastIndx].PHYSEND = m_FastTlb[FastIndx].PHYSSTART + m_FastTlb[FastIndx].Length;
m_FastTlb[FastIndx].VALID = m_tlb[index].EntryLo0.V;
m_FastTlb[FastIndx].DIRTY = m_tlb[index].EntryLo0.D;
m_FastTlb[FastIndx].GLOBAL = m_tlb[index].EntryLo0.GLOBAL & m_tlb[index].EntryLo1.GLOBAL;
m_FastTlb[FastIndx].ValidEntry = FALSE;
m_FastTlb[FastIndx].Random = Random;
m_FastTlb[FastIndx].Probed = false;
FastIndx = (index << 1) + 1;
if (m_FastTlb[FastIndx].VALID)
{
m_CB->TLB_Unmaped(m_FastTlb[FastIndx].VSTART,m_FastTlb[FastIndx].Length);
}
m_FastTlb[FastIndx].Length = (m_tlb[index].PageMask.Mask << 12) + 0xFFF;
m_FastTlb[FastIndx].VSTART=(m_tlb[index].EntryHi.VPN2 << 13) + (m_FastTlb[FastIndx].Length + 1);
m_FastTlb[FastIndx].VEND = m_FastTlb[FastIndx].VSTART + m_FastTlb[FastIndx].Length;
m_FastTlb[FastIndx].PHYSSTART = m_tlb[index].EntryLo1.PFN << 12;
m_FastTlb[FastIndx].PHYSEND = m_FastTlb[FastIndx].PHYSSTART + m_FastTlb[FastIndx].Length;
m_FastTlb[FastIndx].VALID = m_tlb[index].EntryLo1.V;
m_FastTlb[FastIndx].DIRTY = m_tlb[index].EntryLo1.D;
m_FastTlb[FastIndx].GLOBAL = m_tlb[index].EntryLo0.GLOBAL & m_tlb[index].EntryLo1.GLOBAL;
m_FastTlb[FastIndx].ValidEntry = FALSE;
m_FastTlb[FastIndx].Random = Random;
m_FastTlb[FastIndx].Probed = false;
//Test both entries to see if they are valid
for ( FastIndx = index << 1; FastIndx <= (index << 1) + 1; FastIndx++) {
if (!m_FastTlb[FastIndx].VALID) {
m_FastTlb[FastIndx].ValidEntry = true;
continue;
}
if (m_FastTlb[FastIndx].VEND <= m_FastTlb[FastIndx].VSTART) {
continue;
}
if (m_FastTlb[FastIndx].VSTART >= 0x80000000 && m_FastTlb[FastIndx].VEND <= 0xBFFFFFFF) {
continue;
}
if (m_FastTlb[FastIndx].PHYSSTART > 0x1FFFFFFF) {
continue;
}
//MAP the new m_tlb entry for reading and writing
m_FastTlb[FastIndx].ValidEntry = true;
m_CB->TLB_Mapped(m_FastTlb[FastIndx].VSTART,m_FastTlb[FastIndx].Length,m_FastTlb[FastIndx].PHYSSTART, !m_FastTlb[FastIndx].DIRTY);
}
}
bool CTLB::PAddrToVAddr(DWORD PAddr, DWORD & VAddr, DWORD & Index )
{
for (int i = Index; i < 64; i++)
{
if (m_FastTlb[i].ValidEntry == false) { continue; }
if (PAddr >= m_FastTlb[i].PHYSSTART && PAddr < m_FastTlb[i].PHYSEND)
{
VAddr = m_FastTlb[i].VSTART + (PAddr - m_FastTlb[i].PHYSSTART);
Index = i + 1;
return true;
}
}
return false;
}
void CTLB::RecordDifference( CLog &LogFile, const CTLB& rTLB)
{
for (int i = 0, n = sizeof(m_tlb)/sizeof(m_tlb[0]); i < n; i++)
{
if (m_tlb[i].EntryDefined != rTLB.m_tlb[i].EntryDefined)
{
LogFile.LogF("TLB[%d] Defined: %s %s\r\n",i,m_tlb[i].EntryDefined ? "Yes" : "No",rTLB.m_tlb[i].EntryDefined ? "Yes" : "No");
continue;
}
if (!m_tlb[i].EntryDefined) { continue; }
if (m_tlb[i].PageMask.Value != rTLB.m_tlb[i].PageMask.Value)
{
LogFile.LogF("TLB[%d] PageMask: %X %X\r\n",i,m_tlb[i].PageMask.Value,rTLB.m_tlb[i].PageMask.Value);
}
if (m_tlb[i].EntryHi.Value != rTLB.m_tlb[i].EntryHi.Value)
{
LogFile.LogF("TLB[%d] EntryHi: %X %X\r\n",i,m_tlb[i].EntryHi.Value,rTLB.m_tlb[i].EntryHi.Value);
}
if (m_tlb[i].EntryLo0.Value != rTLB.m_tlb[i].EntryLo0.Value)
{
LogFile.LogF("TLB[%d] EntryLo0: %X %X\r\n",i,m_tlb[i].EntryLo0.Value,rTLB.m_tlb[i].EntryLo0.Value);
}
if (m_tlb[i].EntryLo1.Value != rTLB.m_tlb[i].EntryLo1.Value)
{
LogFile.LogF("TLB[%d] EntryLo1: %X %X\r\n",i,m_tlb[i].EntryLo1.Value,rTLB.m_tlb[i].EntryLo1.Value);
}
}
}
bool CTLB::operator == (const CTLB& rTLB) const
{
for (int i = 0, n = sizeof(m_tlb)/sizeof(m_tlb[0]); i < n; i++)
{
if (m_tlb[i].EntryDefined != rTLB.m_tlb[i].EntryDefined) { return false; }
if (!m_tlb[i].EntryDefined) { continue; }
if (m_tlb[i].PageMask.Value != rTLB.m_tlb[i].PageMask.Value ||
m_tlb[i].EntryHi.Value != rTLB.m_tlb[i].EntryHi.Value ||
m_tlb[i].EntryLo0.Value != rTLB.m_tlb[i].EntryLo0.Value ||
m_tlb[i].EntryLo1.Value != rTLB.m_tlb[i].EntryLo1.Value)
{
return false;
}
}
return true;
}
bool CTLB::operator != (const CTLB& rTLB) const
{
return !(*this == rTLB);
}
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