private TLBEntry CreateEntryFromRegs()
{
TLBEntry entry = new TLBEntry(m_MipsState.Addressing64BitMode);
entry.PageMask = m_Cp0Regs.PageMask;
entry.VPN2 = new VirtualPageNumber2(m_Cp0Regs.EntryHi);
entry.PfnOdd = m_Cp0Regs.EntryLo0;
entry.PfnEven = m_Cp0Regs.EntryLo1;
return(entry);
}
public int IndexOf(TLBEntry item)
{
for (Int32 i = 0; i < m_Entries.Length; i++)
{
if (Object.Equals(item, m_Entries[i]))
{
return(i);
}
}
return(-1);
}
public long TranslateVirtualAddress(long virtualAddress)
{
VirtualPageNumber2 vpn2 = new VirtualPageNumber2(m_Cp0Regs.EntryHi);
PageSize pageSize = new PageSize(m_Cp0Regs.PageMask);
TLBEntry entry = null;
/* Note:
* We are assuming the software set ASID and VPN in the EntryHi when comparing
* the virtual address with the TLB cache. Without a real test of this,
* we don't know truly know if we rely on EntryHi every time there is a translation
* to be performed. I do not understand how the TLB is really even used on the N64
* system, virtual memory is useless without having some kind of pagefile.
*/
if (m_DuplicateEntryError)
{
// TODO: Set the TS bit in the status register
m_DisableTLB = true;
return(-1);
}
/* Access the global entries first */
if (!m_GlobalVPN2Dictionary.TryGetValue(vpn2, out entry))
{
/* If nothing is in global table, then access the entries grouped by an ASID */
if (!m_VPN2Dictionary.TryGetValue(vpn2, out entry))
{
throw new TLBException(TLBExceptionType.Refill);
}
}
Boolean isOddPage = ((virtualAddress & pageSize.Size) > 0) ? false : true;
PageFrameNumber pfn = isOddPage ? entry.PfnOdd : entry.PfnEven;
if (pfn.IsValid)
{
return(pfn.MapPhysical(pageSize, (UInt64)virtualAddress));
}
else
{
throw new TLBException(TLBExceptionType.Refill);
}
}
public virtual void Read()
{
if (m_DisableTLB)
{
return;
}
UpdateRandom();
TLBEntry entry = GetEntry((Int32)m_Cp0Regs.Index);
if (entry != null)
{
m_Cp0Regs.PageMask = entry.PageMask;
m_Cp0Regs.EntryHi = entry.VPN2.EntryHi;
m_Cp0Regs.EntryLo0 = entry.PfnOdd;
m_Cp0Regs.EntryLo1 = entry.PfnEven;
}
}
public void AddEntry(int index, TLBEntry entry)
{
m_Entries[index] = entry;
try
{
/* Is the entry global? */
if (entry.IsGlobal)
{
m_GlobalVPN2Dictionary.Add(entry.VPN2, entry);
}
else
{
m_VPN2Dictionary.Add(entry.VPN2, entry);
}
}
catch
{
m_DuplicateEntryError = true;
}
UpdateRandom();
OnCacheChanged(index);
}
public bool Remove(TLBEntry item)
{
throw new NotSupportedException();
}
public bool Contains(TLBEntry item)
{
return(m_Entries.Contains(item));
}
public void Add(TLBEntry item)
{
throw new NotSupportedException();
}
public void Insert(int index, TLBEntry item)
{
m_Entries[index] = item;
}
internal TLBEntryInfo(Int32 index, TLBEntry entry)
{
m_TLBIndex = index;
m_Entry = entry;
}