replace the VHD/diskpart disk image pipeline with a directory-based vvfat root, we'll see when it breaks, fix /O2, add an all_tests, generalize the fat32 driver into a fat 16+32 driver, change policy on volume drivers, collapse KCPU's fields into a single atomic KE_CPU_STATE state machine, move scheduler ticking to per-CPU LAPIC timers, gate verbose SMP topology logging behind selftest diagnostics and add SMP pool-checkpoint validation around AP admission, add checked intrusive list helpers behind a new KE_DEBUG_LIST_CHECKS flag, add ObInitializeObjectHeader/ObTryReferenceObject, add waitable display clock objects and a SYS_OPEN_DISPLAY_CLOCK syscall for vsync-style waits, refactor kernel input into a per-queue KE_INPUT_CONTEXT with its own key/mouse ring buffers and DPC-driven key repeat, add KeInputQueuePeekEvent/ReadEvent/WaitKey and a SYS_QUERY_GLOBAL_INPUT_STATE syscall, split the kernel pool allocator out of mm_virt, new video files!

code/drivers/fs/fat/fat.h

@@ -0,0 +1,44 @@
+// FAT driver internals shared by mount, directory, and file I/O code.
+
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ntlite/ddi/io_driver.h>
+#include <ntlite/ddk/ddk.h>
+#include <ntlite/ddk/file.h>
+#include <ntlite/ddk/memory.h>
+#include <ntlite/ddk/debug.h>
+#include <ntlite/ddk/irp.h>
+#include <ntlite/ddk/semaphore.h>
+#include <ntlite/ddk/thread.h>
+#include <ntlite/ddk/scheduler.h>
+#include <ntlite/ddk/time.h>
+#include <ntlite/ddk/mutex.h>
+#include <ntlite/ddk/irql.h>
+
+typedef struct FAT_VOL_S FAT_VOL;
+
+KSTATUS FatOpen(IO_FILESYSTEM *fs, SYS_STRING_VIEW path, void **fileCtx);
+void FatClose(IO_FILESYSTEM *fs, void *fileCtx);
+KSTATUS FatRead(IO_FILESYSTEM *fs, void *fileCtx, uint64_t offset, void *buf, size_t size, size_t *bytesRead);
+KSTATUS FatWrite(IO_FILESYSTEM *fs, void *fileCtx, uint64_t offset, const void *buf, size_t size, size_t *bytesWritten);
+KSTATUS FatReadAsync(IO_FILESYSTEM *fs, void *fileCtx, uint64_t offset, void *buf, size_t size, IO_FS_ASYNC_COMPLETE complete, void *completeContext);
+KSTATUS FatWriteAsync(IO_FILESYSTEM *fs, void *fileCtx, uint64_t offset, const void *buf, size_t size, IO_FS_ASYNC_COMPLETE complete, void *completeContext);
+KSTATUS FatCreate(IO_FILESYSTEM *fs, SYS_STRING_VIEW path, void **fileCtx);
+KSTATUS FatCreateDir(IO_FILESYSTEM *fs, SYS_STRING_VIEW path);
+KSTATUS FatRemoveDir(IO_FILESYSTEM *fs, SYS_STRING_VIEW path);
+KSTATUS FatDelete(IO_FILESYSTEM *fs, SYS_STRING_VIEW path);
+KSTATUS FatTruncate(IO_FILESYSTEM *fs, void *fileCtx, uint64_t newSize, uint32_t fileFlags);
+uint64_t FatGetSize(IO_FILESYSTEM *fs, void *fileCtx);
+KSTATUS FatQueryInfo(IO_FILESYSTEM *fs, void *fileCtx, SYS_FILE_STAT *out);
+KSTATUS FatStat(IO_FILESYSTEM *fs, SYS_STRING_VIEW path, SYS_FILE_STAT *out);
+KSTATUS FatQueryIdentity(IO_FILESYSTEM *fs, void *fileCtx, IO_FILE_IDENTITY *out);
+KSTATUS FatOpenDir(IO_FILESYSTEM *fs, SYS_STRING_VIEW dirPath, void **dirCtx);
+KSTATUS FatReadDir(IO_FILESYSTEM *fs, void *dirCtx, KDIR_ENTRY *out);
+void FatCloseDir(IO_FILESYSTEM *fs, void *dirCtx);
+void FatQueryStats(IO_FILESYSTEM *fs, IO_FILESYSTEM_STATS *out);
+
+void FatInitVtable(IO_FILESYSTEM* fs, FAT_VOL* vol);