private static void SetupMemoryMap()
{
var mbMapCount = Multiboot.MemoryMapCount;
BootInfo->MemoryMapArray = (BootInfoMemory *)MallocBootInfoData((USize)(sizeof(MultiBootMemoryMap) * MemoryMapReserve));
for (uint i = 0; i < mbMapCount; i++)
{
BootInfo->MemoryMapArray[i].Start = Multiboot.GetMemoryMapBase(i);
BootInfo->MemoryMapArray[i].Size = Multiboot.GetMemoryMapLength(i);
var memType = BootInfoMemoryType.Reserved;
var type = (BIOSMemoryMapType)Multiboot.GetMemoryMapType(i);
var addressSpaceKind = AddressSpaceKind.Physical;
var preMap = false;
switch (type)
{
case BIOSMemoryMapType.Usable:
memType = BootInfoMemoryType.SystemUsable;
break;
case BIOSMemoryMapType.Reserved:
memType = BootInfoMemoryType.Reserved;
break;
case BIOSMemoryMapType.ACPI_Relaimable:
memType = BootInfoMemoryType.ACPI_Relaimable;
break;
case BIOSMemoryMapType.ACPI_NVS_Memory:
memType = BootInfoMemoryType.ACPI_NVS_Memory;
break;
case BIOSMemoryMapType.BadMemory:
memType = BootInfoMemoryType.BadMemory;
break;
default:
memType = BootInfoMemoryType.Unknown;
break;
}
BootInfo->MemoryMapArray[i].Type = memType;
BootInfo->MemoryMapArray[i].AddressSpaceKind = addressSpaceKind;
BootInfo->MemoryMapArray[i].PreMap = preMap;
}
// It's possible, that the BIOS-Area (@640K) is not correctly setup by Multiboot. So add it here manually to be sure
var idx = mbMapCount + 0;
BootInfo->MemoryMapArray[idx].Start = 640 * 1024;
BootInfo->MemoryMapArray[idx].Size = (1024 - 640) * 1024;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.CustomReserved;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Both; //TODO: Physical
BootInfo->MemoryMapArray[idx].PreMap = true;
idx++;
BootInfo->MemoryMapArray[idx].Start = Address.KernelElfSectionPhys;
BootInfo->MemoryMapArray[idx].Size = KMath.AlignValueCeil(LoaderStart.OriginalKernelElf.TotalFileSize, 0x1000);
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.KernelElf;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Physical;
BootInfo->MemoryMapArray[idx].PreMap = true;
idx++;
BootInfo->MemoryMapArray[idx].Start = Address.KernelBootInfo;
BootInfo->MemoryMapArray[idx].Size = 0x1000;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.BootInfoHeader;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Both;
BootInfo->MemoryMapArray[idx].PreMap = true;
idx++;
BootInfo->MemoryMapArray[idx].Start = BootInfo->HeapStart;
BootInfo->MemoryMapArray[idx].Size = 0x1000; //TODO: Recalculate after Setup all Infos
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.BootInfoHeap;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Both;
BootInfo->MemoryMapArray[idx].PreMap = true;
idx++;
uint stackSize = 0x100000; // 1MB
BootInfo->MemoryMapArray[idx].Start = Address.InitialStack - stackSize;
BootInfo->MemoryMapArray[idx].Size = stackSize;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.InitialStack;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Both;
BootInfo->MemoryMapArray[idx].PreMap = true;
idx++;
BootInfo->MemoryMapArray[idx].Start = Address.GCInitialMemory;
BootInfo->MemoryMapArray[idx].Size = Address.GCInitialMemorySize;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.InitialGCMemory;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Both;
BootInfo->MemoryMapArray[idx].PreMap = true;
idx++;
BootInfo->MemoryMapArray[idx].Start = LoaderStart.OriginalKernelElf.GetSectionHeader(".bss")->Addr;
BootInfo->MemoryMapArray[idx].Size = LoaderStart.OriginalKernelElf.GetSectionHeader(".bss")->Size;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.KernelBssSegment;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Virtual;
BootInfo->MemoryMapArray[idx].PreMap = false;
idx++;
BootInfo->MemoryMapArray[idx].Start = LoaderStart.OriginalKernelElf.GetSectionHeader(".text")->Addr;
BootInfo->MemoryMapArray[idx].Size = LoaderStart.OriginalKernelElf.GetSectionHeader(".text")->Size;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.KernelTextSegment;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Virtual;
BootInfo->MemoryMapArray[idx].PreMap = false;
idx++;
BootInfo->MemoryMapArray[idx].Start = LoaderStart.OriginalKernelElf.GetSectionHeader(".rodata")->Addr;
BootInfo->MemoryMapArray[idx].Size = LoaderStart.OriginalKernelElf.GetSectionHeader(".rodata")->Size;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.KernelROdataSegment;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Virtual;
BootInfo->MemoryMapArray[idx].PreMap = false;
idx++;
BootInfo->MemoryMapArray[idx].Start = LoaderStart.OriginalKernelElf.GetSectionHeader(".data")->Addr;
BootInfo->MemoryMapArray[idx].Size = LoaderStart.OriginalKernelElf.GetSectionHeader(".data")->Size;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.KernelDataSegment;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Virtual;
BootInfo->MemoryMapArray[idx].PreMap = false;
// Avoiding the use of the first megabyte of RAM
idx++;
BootInfo->MemoryMapArray[idx].Start = 0x0;
BootInfo->MemoryMapArray[idx].Size = Address.ReserveMemory;
BootInfo->MemoryMapArray[idx].Type = BootInfoMemoryType.KernelReserved;
BootInfo->MemoryMapArray[idx].AddressSpaceKind = AddressSpaceKind.Both;
BootInfo->MemoryMapArray[idx].PreMap = false;
BootInfo->MemoryMapLength = idx + 1;
}
public static void Main()
{
//Screen.BackgroundColor = ScreenColor.Green;
//Screen.Color = ScreenColor.Red;
//Screen.Clear();
//Screen.Goto(0, 0);
//Screen.Write('A');
//Serial.SetupPort(Serial.COM1);
//Serial.Write(Serial.COM1, "Hello");
BootMemory.Setup();
// Setup Kernel Log
var kmsgHandler = new KernelMessageWriter();
KernelMessage.SetHandler(kmsgHandler);
KernelMessage.WriteLine("<LOADER:CONSOLE:BEGIN>");
Assert.Setup(AssertError);
PerformanceCounter.Setup();
// Parse Boot Informations
Multiboot.Setup();
// Parse Kernel ELF section
SetupOriginalKernelElf();
// Print all section of Kernel ELF (for information only)
DumpElfInfo();
// Copy Section to a final destination
SetupKernelSection();
// Collection informations we need to pass to the kernel
BootInfo_.Setup();
// Setup Global Descriptor Table
var map = BootMemory.AllocateMemoryMap(0x1000, BootInfoMemoryType.GDT, AddressSpaceKind.Both);
BootInfo_.AddMap(map);
GDT.Setup(map.Start);
// Now we enable Paging. It's important that we do not cause a Page Fault Exception,
// Because IDT is not setup yet, that could handle this kind of exception.
PageTable.ConfigureType(BootInfo_.BootInfo->PageTableType);
map = BootMemory.AllocateMemoryMap(PageTable.KernelTable.InitalMemoryAllocationSize, BootInfoMemoryType.PageTable, AddressSpaceKind.Both);
BootInfo_.AddMap(map);
PageTable.KernelTable.Setup(map.Start);
MapMemory();
PageTable.KernelTable.EnablePaging();
// Because Kernel is compiled in virtual address space, we need to remap the pages
MapKernelImage();
// Get Entry Point of Kernel
uint kernelEntry = GetKernelStartAddr();
if (kernelEntry == 0)
{
KernelMessage.WriteLine("No kernel entry point found {0:X8}");
KernelMessage.WriteLine("Is the name of entry point correct?");
KernelMessage.WriteLine("Are symbols emitted?");
KernelMessage.WriteLine("System halt!");
while (true)
{
Native.Nop();
}
}
KernelMessage.WriteLine("Call Kernel Start at {0:X8}", kernelEntry);
// Start Kernel.
CallAddress(kernelEntry);
// If we hit this code location, the Kernel Main method returned.
// This would be a general fault. Normally, this code section will overwritten
// by the kernel, so normally, it can never reach this code position.
KernelMessage.WriteLine("Unexpected return from Kernel Start");
Debug.Break();
}
