public void ByteFromVirtualAddressWithEmptyTlbCanBeRead()
{
uint testDataVirtualAddress = 65536;
var(_, _, pdEntryForPt) = TlbHelper.CreatePageTableEntry(0, 4096);
_mmu.CopyToPhysical(0, pdEntryForPt);
var(_, ptIndex, ptEntry) = TlbHelper.CreatePageTableEntry(testDataVirtualAddress, 8192);
uint ptEntryAddress = (uint)(4096 + ptIndex * 4);
_mmu.CopyToPhysical(ptEntryAddress, ptEntry);
var sampleData = new byte[] { 66, 33 };
_mmu.CopyToPhysical(8192, sampleData);
_mmu.GetVirtualByte(testDataVirtualAddress).Should().Be(66);
_mmu.GetVirtualByte(testDataVirtualAddress + 1).Should().Be(33);
}
public void IdentityMaptTest()
{
var(location, data) = TlbHelper.PrepareIdentityMap(MemorySize);
_mmu.CopyToPhysical(location, data);
_mmu._pageDirectory = location;
var storeRand = new Random(0);
var getRand = new Random(0);
for (uint address = 0; address < location; address += 4)
{
var value = (uint)storeRand.Next();
_mmu.StoreVirtualLong(address, value);
var gotValue = _mmu.GetVirtualLong(address);
gotValue.Should().Be(value, $"fail at first pass, address {address}");
}
for (uint address = 0; address < location; address += 4)
{
var expectedValue = (uint)getRand.Next();
var value = _mmu.GetVirtualLong(address);
value.Should().Be(expectedValue, $"fail at second pass, address {address}");
}
}
static void Main(string[] args)
{
const int memorySize = 32 * 1024 * 1024;
var mmu = new Mmu(memorySize);
var decoder = new InstructionDecoder();
var cpu = new Cpu <PhysicalMemoryAccessor, Tracing>(mmu, decoder);
if (false /*cpu is Cpu<VirtualMemoryAccessor>*/)
{
var(location, data) = TlbHelper.PrepareIdentityMap(memorySize);
mmu.CopyToPhysical(location, data);
mmu._pageDirectory = location;
}
else
{
mmu._pageDirectory = memorySize - 4;
}
var elf = ELFReader.Load <uint>("D:\\fibo");
var startAddress = elf.EntryPoint;
var loadableSegments = elf.Segments.Where(s => s.Type == SegmentType.Load);
foreach (var segment in loadableSegments)
{
var content = segment.GetMemoryContents();
var address = segment.PhysicalAddress;
mmu.CopyToPhysical(address, content);
}
cpu.Execute((int)startAddress);
var stoper = Stopwatch.StartNew();
for (var i = 0; i < 10; ++i)
{
cpu.Execute((int)startAddress);
}
stoper.Stop();
Console.WriteLine(stoper.ElapsedMilliseconds);
Console.WriteLine(cpu.InstructionsExecuted);
Console.WriteLine($"{(double)cpu.InstructionsExecuted / stoper.ElapsedMilliseconds / 1000} MIPS");
cpu.Reset();
stoper = Stopwatch.StartNew();
for (var i = 0; i < 100; ++i)
{
cpu.Execute((int)startAddress);
}
stoper.Stop();
Console.WriteLine(stoper.ElapsedMilliseconds);
Console.WriteLine(cpu.InstructionsExecuted);
Console.WriteLine($"{(double)cpu.InstructionsExecuted / stoper.ElapsedMilliseconds / 1000} MIPS");
cpu.Reset();
stoper = Stopwatch.StartNew();
for (var i = 0; i < 100; ++i)
{
cpu.Execute((int)startAddress);
}
stoper.Stop();
Console.WriteLine(stoper.ElapsedMilliseconds);
Console.WriteLine(cpu.InstructionsExecuted);
Console.WriteLine($"{(double)cpu.InstructionsExecuted / stoper.ElapsedMilliseconds / 1000} MIPS");
}
