add page cache with read-ahead and dirty writeback, file-backed and anonymous mmap with CoW, VAD-based virtual memory replacing the old user region model, PFN database with eviction and reclaim, file identity for cross-open section sharing, FAT32 path cache and per-file cluster chain cache, serial.sys for COM1 keyboard input, xHCI MSI with INTx and polled fallback, PciEnableMsiAuto, waitable input queue, KeWaitForAnyEvent, per-process thread info syscall, expanded kernel stats (PFN/PTE/VAD/file-cache/disk), pool allocation tags, async I/O user buffer locking, file flush on close, add docs.md.

code/public/ntlite/display.h

@@ -32,6 +32,43 @@ typedef struct DISPLAY_RECT {
     int32_t H;
 } DISPLAY_RECT;
 
+
+#define SYS_SURFACE_FORMAT_XRGB8888 1u
+#define SYS_SURFACE_FLAG_NONE       0u
+#define SYS_SURFACE_MAX_RECTS       64u
+
+typedef struct SYS_SURFACE_DESC {
+    uint32_t Width;
+    uint32_t Height;
+    uint32_t PitchBytes;
+    uint32_t Format;
+    void*    Base;
+    uint64_t PayloadBytes;
+    uint64_t PageCount;
+    uint64_t MapCount;
+    uint64_t PresentCount;
+    uint64_t PresentRectCount;
+    uint64_t PresentClippedRectCount;
+    uint64_t PresentEmptyClipCount;
+    uint64_t PresentRowsCopied;
+    uint64_t PresentBytesCopied;
+} SYS_SURFACE_DESC;
+
+typedef struct SYS_SURFACE_STATS {
+    uint64_t CreatedSurfaces;
+    uint64_t DestroyedSurfaces;
+    uint64_t LiveSurfaces;
+    uint64_t LivePages;
+    uint64_t LiveBytes;
+    uint64_t MapCalls;
+    uint64_t PresentCalls;
+    uint64_t PresentRectInputs;
+    uint64_t PresentClippedRects;
+    uint64_t PresentEmptyClips;
+    uint64_t PresentRowsCopied;
+    uint64_t PresentBytesCopied;
+} SYS_SURFACE_STATS;
+
 typedef struct DISPLAY_STATS {
     uint64_t BlitCount;
     uint64_t FillRectCount;