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/ddi/hal_api.h

@@ -120,7 +120,7 @@ typedef struct HAL_INIT_PARAMS {
     void*      (*AllocatePool)(size_t size);
 } HAL_INIT_PARAMS;
 
-#define HAL_API_VERSION  5
+#define HAL_API_VERSION // do not change during development
 
 __declspec(dllexport) const HAL_API* HalGetApi(void);
 __declspec(dllexport) void HalRegisterScheduler(void (*pKeSchedulerTick)(void));

code/public/ntlite/ddi/io_driver.h

@@ -179,6 +179,27 @@ typedef void (*IO_DISK_ARRIVAL_CALLBACK)(uint8_t driveIndex,
                                           DEVICE_OBJECT* device,
                                           void* context);
 
+typedef struct IO_DISK_STATS {
+    uint64_t RegisteredDisks;
+    uint64_t ReadRequests;
+    uint64_t ReadSectors;
+    uint64_t WriteRequests;
+    uint64_t WriteSectors;
+    uint64_t MaxReadSectors;
+    uint64_t MaxWriteSectors;
+    uint64_t ReadaheadHits;
+    uint64_t ReadaheadMisses;
+    uint64_t ReadaheadStores;
+    uint64_t ReadaheadInvalidations;
+    uint64_t ReadaheadBytesServed;
+    uint64_t ReadaheadSectorsLoaded;
+    uint64_t ReadaheadSequentialDetections;
+    uint64_t ReadaheadSuppressed;
+    uint64_t ReadaheadAllocFailures;
+    uint64_t ReadaheadReadFailures;
+    uint64_t MaxReadaheadSectors;
+} IO_DISK_STATS;
+
 __declspec(dllexport) KSTATUS IoRegisterDiskDevice(uint8_t driveIndex,
                                                    DEVICE_OBJECT* device);
 __declspec(dllexport) KSTATUS IoNotifyDiskSurpriseRemoved(uint8_t driveIndex);
@@ -203,3 +224,4 @@ __declspec(dllexport) KSTATUS IoWriteDiskSectors(uint8_t driveIndex,
                                                  uint64_t lba,
                                                  uint32_t count,
                                                  const void* buffer);
+__declspec(dllexport) void IoQueryDiskStats(IO_DISK_STATS* out);

code/public/ntlite/ddi/pci.h

@@ -118,3 +118,6 @@ PCI_API KSTATUS PciGetInterrupt(DEVICE_OBJECT* pdo,
 
 PCI_API KSTATUS PciEnableMsi(DEVICE_OBJECT* pdo,
                                            uint8_t irqSlot);
+
+PCI_API KSTATUS PciEnableMsiAuto(DEVICE_OBJECT* pdo,
+                                               uint8_t* outIrqSlot);