diff --git a/sdk/head/ptapi/ptmm.h b/sdk/head/ptapi/ptmm.h
new file mode 100644
index 0000000..27bc7e8
--- /dev/null
+++ b/sdk/head/ptapi/ptmm.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: Memory management API
+ * Author:      Chloe M.
+ */
+
+#ifndef _PTAPI_PTMM_H_
+#define _PTAPI_PTMM_H_ 1
+
+#include <ptdef.h>
+
+/* Protection flags type */
+typedef USHORT MM_PROT;
+
+/* Page-level protection flags */
+#define PAGE_READ   0x00
+#define PAGE_WRITE  BIT(0)
+#define PAGE_EXEC   BIT(1)
+#if defined(_KERNEL)
+#define PAGE_USER   BIT(2)
+#endif  /* !_KERNEL */
+
+#endif  /* !_PTAPI_PTMM_H_ */