[WDF] Add Windows Driver Framework files

Takern from Microsoft GitHub repo:
d9c6040fe9

Licensed under MIT

sdk/lib/drivers/wdf/kmdf/inc/private/fxcommonbuffer.hpp

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+/*++
+
+Copyright (c) Microsoft Corporation
+
+Module Name:
+
+    FxCommonBuffer.hpp
+
+Abstract:
+
+    WDF CommonBuffer Object support
+
+Environment:
+
+    Kernel mode only.
+
+Notes:
+
+
+Revision History:
+
+--*/
+
+#ifndef _FXCOMMONBUFFER_H_
+#define _FXCOMMONBUFFER_H_
+
+//
+// Calculate an "aligned" address (Logical or Virtual) per
+// a specific alignment value.
+//
+FORCEINLINE
+PVOID
+FX_ALIGN_VIRTUAL_ADDRESS(
+    __in PVOID VA,
+    __in size_t AlignTo
+    )
+{
+   return (PVOID)(((ULONG_PTR)VA + AlignTo) & ~AlignTo);
+}
+
+FORCEINLINE
+ULONGLONG
+FX_ALIGN_LOGICAL_ADDRESS(
+    __in PHYSICAL_ADDRESS LA,
+    __in size_t AlignTo
+    )
+{
+   return (LA.QuadPart + AlignTo) & ~((ULONGLONG)AlignTo);
+}
+
+//
+// Declare the FxCommonBuffer class
+//
+class FxCommonBuffer : public FxNonPagedObject {
+
+public:
+
+    FxCommonBuffer(
+        __in PFX_DRIVER_GLOBALS FxDriverGlobals,
+        __in FxDmaEnabler * pDmaEnabler
+        );
+
+    virtual
+    BOOLEAN
+    Dispose(
+        VOID
+        );
+
+    _Must_inspect_result_
+    NTSTATUS
+    AllocateCommonBuffer(
+        __in size_t   Length
+        );
+
+    VOID
+    FreeCommonBuffer(
+        VOID
+        );
+
+    __forceinline
+    PHYSICAL_ADDRESS
+    GetAlignedLogicalAddress(
+        VOID
+        )
+    {
+        return m_BufferAlignedLA;
+    }
+
+    __forceinline
+    PVOID
+    GetAlignedVirtualAddress(
+        VOID
+        )
+    {
+        return m_BufferAlignedVA;
+    }
+
+    __forceinline
+    size_t
+    GetLength(
+        VOID
+        )
+    {
+        return m_Length;
+    }
+
+    __forceinline
+    VOID
+    SetAlignment(
+        __in ULONG Alignment
+        )
+    {
+        m_Alignment = Alignment;
+    }
+
+protected:
+
+    //
+    // Unaligned virtual address
+    //
+    PVOID                 m_BufferRawVA;
+
+    //
+    // Aligned virtual address
+    //
+    PVOID                 m_BufferAlignedVA;
+
+    //
+    // Aligned logical address
+    //
+    PHYSICAL_ADDRESS      m_BufferAlignedLA;
+
+    //
+    // Unaligned logical address
+    //
+    PHYSICAL_ADDRESS      m_BufferRawLA;
+
+    //
+    // Pointer to the DMA enabler
+    //
+    FxDmaEnabler        * m_DmaEnabler;
+
+    //
+    // Length specified by the caller
+    //
+    size_t                m_Length;
+
+    //
+    // Actual length used to allocate buffer after adding the alignement
+    // value.
+    //
+    size_t                m_RawLength;
+
+    //
+    // Alignment of the allocated buffer.
+    //
+    size_t               m_Alignment;
+
+};
+
+#endif // _FXCOMMONBUFFER_H_