public static void EntryPoint()
{
Console.SetBackground(ConsoleColor.Blue);
Console.SetForground(ConsoleColor.White);
Console.ClearScreen();
Console.Write("Booting...");
BootPageAllocator.Setup();
Console.Write("1...");
BootMemoryMap.Initialize();
Console.Write("3...");
BootMemoryMap.ImportPlatformMemoryMap();
Console.Write("2...");
BootMemoryMap.ImportMultibootV1MemoryMap();
BootMemoryMap.Dump();
Console.Write("4...");
PhysicalPageAllocator.Setup();
Console.Write("5...");
PageTable.Setup();
Console.Write("6...");
while (true)
{
}
}
public static void EntryPoint()
{
Platform.EntryPoint();
Console.SetBackground(ConsoleColor.Blue);
Console.SetForground(ConsoleColor.White);
Console.ClearScreen();
Console.Write("Booting...");
BootPageAllocator.Setup();
Console.Write("1...");
BootMemoryMap.Initialize();
Console.Write("2...");
Platform.UpdateBootMemoryMap();
Console.Write("3...");
BootMemoryMap.ImportMultibootV1MemoryMap();
Console.Write("4...");
//PhysicalPageAllocator.Setup();
// TODO: PageFrameAllocator --- allocates single pages only
PageTable.Setup();
Console.Write("5...");
while (true)
{
}
}
public static void EntryPoint()
{
Platform.EntryPoint();
BootMemoryMap.Initialize();
Platform.UpdateBootMemoryMap();
ImportMultibootMemoryMap();
}
private static void ImportMultibootMemoryMap()
{
if (!Multiboot.IsAvailable)
{
return;
}
if (Multiboot.MultibootV1.MemoryMapStart.IsNull())
{
return;
}
var memoryMapEnd = Multiboot.MultibootV1.MemoryMapStart + (int)Multiboot.MultibootV1.MemoryMapLength;
var entry = new MultibootV1MemoryMapEntry(Multiboot.MultibootV1.MemoryMapStart);
while (entry.IsAvailable)
{
BootMemoryMap.SetMemoryMap(entry.BaseAddr, entry.Length, entry.Type == 1 ? BootMemoryMapType.Available : BootMemoryMapType.Reserved);
entry = entry.GetNext(memoryMapEnd);
}
}
public static void Setup()
{
BitMapIndexTable = new BitMapIndexTable(BootPageAllocator.AllocatePage());
var maximumMemoryAddress = BootMemoryMap.GetMaximumAddress();
TotalPages = (uint)(maximumMemoryAddress.ToInt64() / Page.Size);
var bitMapCount = TotalPages / (Page.Size * 8);
for (uint i = 0; i < bitMapCount; i++)
{
var bitmap = BootPageAllocator.AllocatePage();
Page.ClearPage(bitmap);
BitMapIndexTable.AddBitMapEntry(i, bitmap);
}
var entries = BootMemoryMap.GetBootMemoryMapEntryCount();
// pass 0 - mark available pages
for (uint i = 0; i < entries; i++)
{
var entry = BootMemoryMap.GetBootMemoryMapEntry(i);
if (!entry.IsAvailable)
{
continue;
}
var start = Alignment.AlignUp(entry.StartAddress.ToInt64(), Page.Size);
var end = Alignment.AlignDown(entry.EndAddress.ToInt64() + 1, Page.Size);
var pages = (uint)(end - start) / Page.Size;
if (pages <= 0)
{
continue;
}
var startPage = (uint)(start / Page.Shift);
var endPage = startPage + pages - 1;
MinimumAvailablePage = Math.Min(MinimumAvailablePage, startPage);
MaximumAvailablePage = Math.Max(MaximumAvailablePage, endPage);
SetPageBitMapEntry(startPage, pages, entry.IsAvailable);
}
// pass 1 - unmark reserved pages
for (uint i = 0; i < entries; i++)
{
var entry = BootMemoryMap.GetBootMemoryMapEntry(i);
if (entry.IsAvailable)
{
continue;
}
var start = Alignment.AlignUp(entry.StartAddress.ToInt64(), Page.Size);
var end = Alignment.AlignDown(entry.EndAddress.ToInt64() + 1, Page.Size);
var pages = (uint)(end - start) / Page.Size;
if (pages <= 0)
{
continue;
}
var startPage = (uint)(start / Page.Shift);
var endPage = startPage + pages - 1;
MinimumReservedPage = Math.Min(MinimumReservedPage, startPage);
MaximumReservedPage = Math.Max(MaximumReservedPage, endPage);
if (MinimumAvailablePage >= startPage && MinimumAvailablePage <= endPage)
{
MinimumAvailablePage = endPage + 1;
}
if (MaximumAvailablePage >= startPage && MaximumAvailablePage <= endPage)
{
MaximumAvailablePage = startPage - 1;
}
SetPageBitMapEntry(startPage, pages, entry.IsAvailable);
}
SearchNextStartPage = MinimumAvailablePage;
}
public static void UpdateBootMemoryMap()
{
// Reserve the first 1MB
BootMemoryMap.SetMemoryMap(new Pointer(0), 1024 * 1024, BootMemoryMapType.Reserved);
}
