diff --git a/paw/stos/head/mm/vmm.h b/paw/stos/head/mm/vmm.h
new file mode 100644
index 0000000..afc4d3e
--- /dev/null
+++ b/paw/stos/head/mm/vmm.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: Virtual memory manager
+ * Author:      Chloe M.
+ */
+
+#ifndef _MM_VMM_H_
+#define _MM_VMM_H_ 1
+
+#include <stdef.h>
+#include <ke/bpal.h>
+
+#define VALLOC_BASE 0xFFFF804000000000
+
+#define PMA_TO_VMA(PMA) \
+    PTR_OFFSET((VOID *)PMA, KeBpalLoadBase())
+#define VMA_TO_PMA(VMA) \
+    (UPTR)PTR_NOFFSET(VMA, KeBpalLoadBase())
+
+#endif  /* !_MM_VMM_H_ */