public static void Setup()
{
var addr = Initial_FindIFreePage();
KernelMessage.Path("KernelMemoryMapManager", "Initial Page: {0:X}", addr);
// 80KB should be enough
// TODO: Check if really 80KB are available after this address.
InitialMap = new KernelMemoryMap(addr, 0x1000 * 20, BootInfoMemoryType.KernelMemoryMap);
Memory.InitialKernelProtect_MakeWritable_BySize(InitialMap.Start, InitialMap.Size);
Header = (KernelMemoryMapHeader *)InitialMap.Start;
var arrayOffset1 = 0x1000;
var arrayOffset2 = 0x3000;
Header->SystemUsable = new KernelMemoryMapArray((KernelMemoryMap *)(InitialMap.Start + arrayOffset1), 50);
Header->Used = new KernelMemoryMapArray((KernelMemoryMap *)(InitialMap.Start + arrayOffset2), 100);
for (uint i = 0; i < BootInfo.Header->MemoryMapLength; i++)
{
var map = BootInfo.Header->MemoryMapArray[i];
var kmap = new KernelMemoryMap(map.Start, map.Size, map.Type);
if (kmap.Type == BootInfoMemoryType.SystemUsable)
{
Header->SystemUsable.Add(kmap);
}
else
{
Header->Used.Add(kmap);
}
}
Header->Used.Add(InitialMap);
//Debug_FillAvailableMemory();
}
/// <summary>
/// Video Stage
/// </summary>
public unsafe static void InitFrameBuffer()
{
if (!BootInfo.Header->FBPresent || BootInfo.Header->VBEMode < 0x100)
{
KernelMessage.Path("fb", "not present");
return;
}
KernelMessage.WriteLine("InitFrameBuffer");
fb = new FrameBuffer(BootInfo.Header->FbInfo.FbAddr, BootInfo.Header->FbInfo.FbWidth, BootInfo.Header->FbInfo.FbHeight, BootInfo.Header->FbInfo.FbPitch, 8);
fb.Init();
FrameBufferTextScreen = new FrameBufferTextScreenDevice(fb);
Console.SetOutputDevice(FrameBufferTextScreen);
}
public static KernelMemoryMap Allocate(USize size, BootInfoMemoryType type)
{
var cnt = Header->Used.Count;
for (uint i = 0; i < cnt; i++)
{
var map = Header->Used.Items[i];
if (CheckPageIsUsableAfterMap(map, size))
{
var newMap = new KernelMemoryMap(map.Start + map.Size, size, type);
Header->Used.Add(newMap);
KernelMessage.Path("KernelMemoryMapManager", "Allocated: at {0:X8}, size {1:X8}, type {2}", newMap.Start, size, (uint)type);
return(newMap);
}
}
return(KernelMemoryMap.Empty);
}