public void iTLBTest_All_Valid()
{
const int ENTRIES = 256;
iTLB TLB = new iTLB();
//Test Vars
ulong Curr_Entry;
ulong Curr_Addr;
ulong Result;
ulong Expected_Result;
//PTE Contains
//4 Unused Bits
//4 bit protection
//1 Valid Bit
//31 bit page address tag
//24 bit physical addr
ulong[] Entries = new ulong[ENTRIES];
for (int i = 0; i < ENTRIES; i++)
{
ulong unused = 0x0; //4 Unused Bits
ulong prot = ((ulong)0xF) << 56; //4 bit protection
ulong valid = ((ulong)0x1) << 55; //1 Valid Bit
ulong tag = (((ulong)(i & 0x07FFFFFFF)) << 24); //31 bit page address tag
ulong phys_addr = 0xFFFFFF; //24 bit physical addr
Entries[i] = unused | prot | valid | tag | phys_addr;
}
//Virtual Address Contains
//5 bit page index
//31 bit page address tag
//12 bit page offset
ulong[] Virtual_Addrs = new ulong[ENTRIES];
for (int i = 0; i < ENTRIES; i++)
{
Virtual_Addrs[i] =
((ulong)(0x001F & (i % iTLB.ENTRIES)) << 43) | //5 bit page index (leading bit of 0)
((ulong)(0x07FFFFFFF & i) << 12) | //31 bit page address tag
(0x0FFF); //12 bit page offset
}
for (int i = 0; i < ENTRIES; i++)
{
Curr_Entry = Entries[i];
Curr_Addr = Virtual_Addrs[i];
Expected_Result = id_TLBParser.getPhyicalAddressFromPageTableEntry(Curr_Entry);
TLB.setEntry_LRU(Curr_Addr, Curr_Entry);
Result = TLB.searchBanks(Curr_Addr);
Assert.AreEqual(Expected_Result, Result);
}
}
public static ulong SearchiTLB(VirtualPageTable vpt, iTLB itlb, TLB tlb, ulong virtualAddress)
{
ulong result = itlb.searchBanks(virtualAddress);
ulong generatedVirtualAndPhysicalAddressPair;
if (result == Constants.NOT_FOUND)
{
//itlb miss
result = tlb.searchBanks(virtualAddress);
if (result != Constants.NOT_FOUND)
{
//copy to itlb using LRU
return result;
}
else
{
//signal tlb miss
generatedVirtualAndPhysicalAddressPair = AddressGenerator.GeneratorSixtyBitVirtualPhysicalPair();
result = vpt.search(generatedVirtualAndPhysicalAddressPair);
if (false)//result == Constants.PAGE_FAULT)
{
//signal page fault
//copy page from disk
}
}
}
else
{
}
return 0;
}