/// <summary>
/// Setup the physical page manager
/// </summary>
public void Setup()
{
uint physMem = BootInfo.Header->InstalledPhysicalMemory;
PageCount = physMem / PageSize;
kmap = KernelMemoryMapManager.Allocate(PageCount * (uint)sizeof(Page), BootInfoMemoryType.PageFrameAllocator);
PageArray = (Page *)kmap.Start;
lastAllocatedPage = PageArray;
Memory.InitialKernelProtect_MakeWritable_BySize(kmap.Start, kmap.Size);
MemoryOperation.Clear4(kmap.Start, kmap.Size);
for (uint i = 0; i < PageCount; i++)
{
PageArray[i].PhysicalAddress = i * PageSize;
if (i != 0)
{
PageArray[i - 1].Next = &PageArray[i];
}
}
SetupFreeMemory();
for (uint i = 0; i < PageCount; i++)
{
if (!PageArray[i].Used)
{
PageArray[i].Status = PageStatus.Free;
}
}
}
/// <summary>
/// allocate memory. The memory is set to zero.
/// </summary>
public static Addr AllocateCleared(USize n, GFP flags)
{
var addr = Allocate(n, flags);
MemoryOperation.Clear(addr, n);
return(addr);
}
/// <summary>
/// allocate memory for an array. The memory is set to zero.
/// </summary>
public static Addr AllocateArrayCleared(USize elements, USize size, GFP flags)
{
var total = elements * size;
var addr = Allocate(total, flags);
MemoryOperation.Clear(addr, total);
return(addr);
}
/// <summary>
/// Goto the next line.
/// </summary>
public static void NextLine()
{
Column = 0;
if (row >= Rows - 1)
{
// Copy All rows one line up
// TODO: Normally, Reading from mapped ROM is much slower
// than reading from normal RAM. Consider using Offscreen Buffer
MemoryOperation.Copy(ScreenMemoryAddress + Columns * 2, ScreenMemoryAddress, (Rows - 1) * Columns * 2);
//Blank last line
for (uint c = 0; c < Columns; c++)
{
RawWrite(row, c, ' ', color);
}
}
else
{
Row++;
}
UpdateCursor();
}
public static void InitializeGCMemory()
{
// Wipe GCMemory from Bootloader
Memory.InitialKernelProtect_MakeWritable_BySize(Address.GCInitialMemory, Address.GCInitialMemorySize);
MemoryOperation.Clear4(Address.GCInitialMemory, Address.GCInitialMemorySize);
}
unsafe static void SetupKernelSection()
{
// TODO: Respect section progream header adresses.
// Currently, we can make a raw copy of ELF file
MemoryOperation.Copy4(Address.OriginalKernelElfSection, Address.KernelElfSection, OriginalKernelElf.TotalFileSize);
}