/// <summary>
/// Maps a given range of pages to the specified CPU virtual address.
/// </summary>
/// <remarks>
/// All addresses and sizes must be page aligned.
/// </remarks>
/// <param name="pa">CPU virtual address to map into</param>
/// <param name="va">GPU virtual address to be mapped</param>
/// <param name="size">Size in bytes of the mapping</param>
/// <param name="kind">Kind of the resource located at the mapping</param>
public void Map(ulong pa, ulong va, ulong size, PteKind kind)
{
lock (_pageTable)
{
MemoryUnmapped?.Invoke(this, new UnmapEventArgs(va, size));
for (ulong offset = 0; offset < size; offset += PageSize)
{
SetPte(va + offset, PackPte(pa + offset, kind));
}
}
}
/// <summary>
/// Checks if the kind is pitch.
/// </summary>
/// <param name="kind">Kind to check</param>
/// <returns>True if pitch, false otherwise</returns>
public static bool IsPitch(this PteKind kind)
{
return(kind == PteKind.Pitch || kind == PteKind.PitchNoSwizzle);
}
/// <summary>
/// Creates a page table entry from a physical address and kind.
/// </summary>
/// <param name="pa">Physical address</param>
/// <param name="kind">Kind</param>
/// <returns>Page table entry</returns>
private static ulong PackPte(ulong pa, PteKind kind)
{
return(pa | ((ulong)kind << 56));
}
