[SDK/INCLUDE] Define a structure describing boot-time framebuffer information (#6658)

This information is set up by the bootloader hardware detector and stored
into the system configuration tree for consumption by the NT OS loader and
other OS subsystems. This method doesn't require modifying the NT kernel
loader parameter block or extension(s), thus also allowing for a backward-
compatible usage when loading Windows OSes like 2000, XP/2003, or Vista/7.

The framebuffer information can then be retrieved by a supported bootvid
and a generic framebuffer win32k video driver.

sdk/include/reactos/drivers/bootvid/framebuf.h

@@ -0,0 +1,68 @@
+/*
+ * PROJECT:     ReactOS Boot Video Driver
+ * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
+ *              or MIT (https://spdx.org/licenses/MIT)
+ * PURPOSE:     Definitions for framebuffer-specific DisplayController
+ *              device boot-time configuration data stored in the
+ *              \Registry\Machine\Hardware\Description ARC tree.
+ * COPYRIGHT:   Copyright 2023-2026 Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   ReactOS Framebuffer-specific video device configuration data.
+ *
+ * Supplemental data that extends CM_VIDEO_DEVICE_DATA.
+ * It is appended to the standard configuration resource list,
+ * as a CmResourceTypeDeviceSpecific data descriptor.
+ *
+ * - Any optional Irql/Vector interrupt settings are specified with
+ *   a CmResourceTypeInterrupt descriptor, while any other I/O port
+ *   is specified with a CmResourceTypePort descriptor.
+ *
+ * - The video RAM physical address base and size are specified by
+ *   the first CmResourceTypeMemory descriptor in the list.
+ *
+ * - The framebuffer is the actively displayed part of video RAM,
+ *   and is specified via the FrameBufferOffset member.
+ **/
+typedef struct _CM_FRAMEBUF_DEVICE_DATA
+{
+    CM_VIDEO_DEVICE_DATA;
+
+    /* Absolute offset from the start of the video RAM of the framebuffer
+     * to be displayed on the monitor. The framebuffer size is obtained by:
+     * FrameBufferSize = ScreenHeight * PixelsPerScanLine * BytesPerPixel */
+    ULONG FrameBufferOffset;
+
+    /* Horizontal and Vertical resolution in pixels */
+    ULONG ScreenWidth;
+    ULONG ScreenHeight;
+
+    /* Number of pixel elements per video memory line. Related to
+     * the number of bytes per scan-line (pitch/screen stride) via:
+     * Pitch = PixelsPerScanLine * BytesPerPixel */
+    ULONG PixelsPerScanLine; ///< Pitch/stride in pixels
+    ULONG BitsPerPixel;      ///< Pixel depth
+
+    /* Pixel physical format for BPP > 8 */
+    struct
+    {
+        ULONG RedMask;
+        ULONG GreenMask;
+        ULONG BlueMask;
+        ULONG ReservedMask;
+    } PixelMasks;
+
+} CM_FRAMEBUF_DEVICE_DATA, *PCM_FRAMEBUF_DEVICE_DATA;
+
+#ifdef __cplusplus
+}
+#endif
+
+/* EOF */