implement proper IRQL, DPCs, kernel and user APCs, alertable waits, async file I/O with cancellation, trap frames, selftests, a real driver/device model, native async FAT32, VFAT dotfile fixes, syscall ABI cleanup, async_apc and async_cancel tests, POSIX multi-volume paths, and pimp the readme.

code/kernel/ke_irql.h

@@ -0,0 +1,34 @@
+#pragma once
+// ke_irql.h - software IRQL skeleton
+//
+// This is intentionally small for the first IRQL/APC bring-up step.  It does
+// not yet program interrupt hardware or replace the spinlock interrupt-disable
+// path.  It gives the kernel one authoritative execution-level state plus
+// assertions so blocking code can reject illegal callers early.
+
+#include <stdint.h>
+
+typedef uint8_t KIRQL;
+
+#define PASSIVE_LEVEL   ((KIRQL)0)
+#define APC_LEVEL       ((KIRQL)1)
+#define DISPATCH_LEVEL  ((KIRQL)2)
+#define DIRQL_BASE      ((KIRQL)16)
+#define HIGH_LEVEL      ((KIRQL)31)
+
+__declspec(dllexport) KIRQL KeGetCurrentIrql(void);
+
+// Raise to newIrql and return the previous level.  Raising to a lower level is
+// a kernel bug and will panic in checked/debug-style builds.
+__declspec(dllexport) KIRQL KeRaiseIrql(KIRQL newIrql);
+
+// Restore a previously returned level.  Lowering to a higher level is a kernel
+// bug and will panic.
+__declspec(dllexport) void KeLowerIrql(KIRQL oldIrql);
+
+__declspec(dllexport) void KeAssertIrql(KIRQL expected);
+__declspec(dllexport) void KeAssertIrqlAtOrBelow(KIRQL maxIrql);
+__declspec(dllexport) int  KeCanWait(void);
+
+// Internal/debug helper used by diagnostics and panic messages.
+__declspec(dllexport) const char* KeIrqlName(KIRQL irql);