public static MemoryRegion AllocateRegion(this IPageFrameAllocator allocator, USize size, AllocatePageOptions options = default)
{
var pages = KMath.DivCeil(size, 4096);
var p = allocator.AllocatePages(pages, options);
return(new MemoryRegion(allocator.GetAddress(p), pages * 4096));
}
private static unsafe Addr AllocateGlobalPages(uint pages, AllocatePageOptions options = default)
{
if (AddProtectedRegions)
{
pages += 2;
}
//lock (lockObj)
//{
// LockCount++;
var physHead = PhysicalPageManager.AllocatePages(pages, options);
if (physHead == null)
{
return(Addr.Zero);
}
var virtHead = GlobalAllocator.AllocatePages(pages, options);
var p = physHead;
var v = virtHead;
for (var i = 0; i < pages; i++)
{
var map = true;
if (AddProtectedRegions && (i == 0 || i == pages - 1))
{
map = false;
}
if (map)
{
PageTable.KernelTable.Map(GlobalAllocator.GetAddress(v), PhysicalPageManager.GetAddress(p));
}
p = PhysicalPageManager.NextCompoundPage(p);
v = GlobalAllocator.NextCompoundPage(v);
}
PageTable.KernelTable.Flush();
if (AddProtectedRegions)
{
virtHead = GlobalAllocator.NextCompoundPage(virtHead);
}
//LockCount--;
return(GlobalAllocator.GetAddress(virtHead));
//}
}
/// <summary>
/// Returns pages, where virtAddr equals physAddr.
/// </summary>
private static unsafe Addr AllocateIdentityMappedPages(uint pages, AllocatePageOptions options = default)
{
if (AddProtectedRegions)
{
pages += 2;
}
var virtHead = IdentityAllocator.AllocatePages(pages, options);
var v = virtHead;
for (var i = 0; i < pages; i++)
{
var addr = IdentityAllocator.GetAddress(v);
var map = true;
if (AddProtectedRegions && (i == 0 || i == pages - 1))
{
map = false;
}
if (map)
{
PageTable.KernelTable.Map(addr, addr);
}
v = IdentityAllocator.NextCompoundPage(v);
}
PageTable.KernelTable.Flush();
if (AddProtectedRegions)
{
virtHead = IdentityAllocator.NextCompoundPage(virtHead);
}
return(IdentityAllocator.GetAddress(virtHead));
}
public static Page *AllocatePages(uint pages, AllocatePageOptions options = default)
{
return(Default.AllocatePages(pages, options));
}
public static Addr AllocatePagesAddr(this IPageFrameAllocator allocator, uint pages, AllocatePageOptions options = default)
{
return(allocator.GetAddress(allocator.AllocatePages(pages, options)));
}