public virtual void Setup(MemoryRegion region, AddressSpaceKind addressSpaceKind)
{
AddressSpaceKind = addressSpaceKind;
region.Size = KMath.FloorToPowerOfTwo(region.Size);
_Region = region;
var totalPages = region.Size >> BuddyAllocatorImplementation.BUDDY_PAGE_SHIFT;
KernelMessage.WriteLine("Init Allocator: StartAddr: {0}, {1} Pages", region.Start, totalPages);
// init global memory block
// all pages area
var pages_size = totalPages * (uint)sizeof(Page);
KernelMessage.WriteLine("Page Array Size in bytes: {0}", pages_size);
Pages = (Page *)AllocRawMemory(pages_size).Start;
KernelMessage.WriteLine("Page Array Addr: {0:X8}", (uint)Pages);
var start_addr = region.Start;
Zone.free_area = (BuddyAllocatorImplementation.free_area *)AllocRawMemory(BuddyAllocatorImplementation.BUDDY_MAX_ORDER * (uint)sizeof(BuddyAllocatorImplementation.free_area)).Start;
fixed(BuddyAllocatorImplementation.mem_zone *zone = &Zone)
ZonePtr = zone;
BuddyAllocatorImplementation.buddy_system_init(
ZonePtr,
Pages,
start_addr,
totalPages);
}
public Page *NextCompoundPage(Page *page)
{
if (page == null)
{
return(null);
}
var next = NextPage(page);
if (next == null)
{
return(null);
}
if (BuddyAllocatorImplementation.PageHead(page))
{
if (BuddyAllocatorImplementation.PageTail(next))
{
return(next);
}
else
{
return(null);
}
}
else if (BuddyAllocatorImplementation.PageTail(page))
{
if (BuddyAllocatorImplementation.PageTail(next))
{
return(next);
}
else
{
return(null);
}
}
else
{
return(null);
}
}
private Page *Allocate(uint num)
{
return(BuddyAllocatorImplementation.buddy_get_pages(ZonePtr, GetOrderForPageCount(num)));
}
public uint GetAddress(Page *page)
{
return((uint)BuddyAllocatorImplementation.page_to_virt(ZonePtr, page));
}
public uint GetPageNum(Page *page)
{
return((uint)BuddyAllocatorImplementation.page_to_virt(ZonePtr, page) >> BuddyAllocatorImplementation.BUDDY_PAGE_SHIFT);
}
public void Free(Page *page)
{
BuddyAllocatorImplementation.buddy_free_pages(ZonePtr, page);
}
public Page *GetPageByNum(uint pageNum)
{
return(BuddyAllocatorImplementation.virt_to_page(ZonePtr, (void *)(pageNum << BuddyAllocatorImplementation.BUDDY_PAGE_SHIFT)));
}
public Page *GetPageByAddress(Addr addr)
{
return(BuddyAllocatorImplementation.virt_to_page(ZonePtr, addr));
}