/// <summary>
/// Returns the paging granularity of the pointer <paramref name="page" />.
/// </summary>
/// <returns>
/// The granularity level or -1 if the pointer is not page-aligned.
/// </returns>
public static uint GetPointerGranularity(void *page)
{
ulong pagei = (ulong)page;
uint levels = GetBigGranularity() + 1;
for (uint x = 0; x < levels; ++x)
{
PageAllocator.Errors err = PageAllocator.Errors.Success;
uint size = GetGranularitySize(x, &err);
if (err != PageAllocator.Errors.Success)
{
TextMode.Write("Error: ");
TextMode.Write((int)err);
Diagnostics.Assert(false, "Failed to get pager granularity!");
}
if ((pagei & (ulong)(size - 1)) == 0)
{
return(x);
}
}
return(0xFFFFFFFF);
}
/// <summary>
/// Aligns the pointer <paramref name="ptr" /> to the page granularity
/// specified by <paramref name="granularity" />. This method asserts
/// that the granularity is within the allowed range for the ADC layer
/// in use.
/// <returns>
/// A pointer which is aligned to the page boundaries of the given
/// granularity.
/// </returns>
/// </summary>
public static void *PageAlign(void *ptr, uint granularity)
{
Diagnostics.Assert(granularity >= 0 && granularity <= GetBigGranularity(),
"Specified invalid granularity level");
PageAllocator.Errors err = PageAllocator.Errors.Success;
uint size = GetGranularitySize(granularity, &err);
ulong ptri = (ulong)ptr;
Diagnostics.AssertZero((uint)err, "Failed to get granularity size");
return((void *)(ptri - (ptri & (size - 1))));
}
