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project64/Source/Project64-core/N64System/Mips/TLB.cpp

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#include "stdafx.h"
#include "TLB.h"
#include <Project64-core/N64System/SystemGlobals.h>
#include <Project64-core/N64System/Mips/Register.h>
CTLB::CTLB(CTLB_CB * CallBack) :
m_CB(CallBack)
{
WriteTrace(TraceTLB, TraceDebug, "Start");
memset(m_tlb, 0, sizeof(m_tlb));
memset(m_FastTlb, 0, sizeof(m_FastTlb));
Reset(true);
WriteTrace(TraceTLB, TraceDebug, "Done");
}
CTLB::~CTLB()
{
WriteTrace(TraceTLB, TraceDebug, "Start");
WriteTrace(TraceTLB, TraceDebug, "Done");
}
void CTLB::Reset(bool InvalidateTLB)
{
uint32_t 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(uint32_t VAddr)
{
uint32_t 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()
{
int Counter;
WriteTrace(TraceTLB, TraceDebug, "Start");
g_Reg->INDEX_REGISTER |= 0x80000000;
for (Counter = 0; Counter < 32; Counter++)
{
if (!m_tlb[Counter].EntryDefined)
{
continue;
}
uint32_t & TlbEntryHiValue = m_tlb[Counter].EntryHi.Value;
uint32_t Mask = ~m_tlb[Counter].PageMask.Mask << 13;
uint32_t TlbValueMasked = TlbEntryHiValue & Mask;
uint32_t 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, TraceDebug, "Done");
}
void CTLB::ReadEntry()
{
uint32_t 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;
WriteTrace(TraceTLB, TraceDebug, "%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 itself
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)
{
WriteTrace(TraceTLB, TraceDebug, "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)
{
WriteTrace(TraceTLB, TraceDebug, "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].PHYSEND > 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(uint32_t PAddr, uint32_t & VAddr, uint32_t & 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
{
const size_t n = sizeof(m_tlb) / sizeof(m_tlb[0]);
for (size_t i = 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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