diff --git a/include/asm-mips/prctl.h b/include/asm-mips/prctl.h
new file mode 100644
index 0000000..4aaaff6
--- /dev/null
+++ b/include/asm-mips/prctl.h
@@ -0,0 +1,41 @@
+/*
+ * IRIX prctl interface
+ *
+ * The IRIX kernel maps a page at PRDA_ADDRESS with the
+ * contents of prda and fills it the bits on prda_sys.
+ */
+
+#ifndef __PRCTL_H__
+#define __PRCTL_H__
+
+#define PRDA_ADDRESS 0x200000L
+#define PRDA ((struct prda *) PRDA_ADDRESS)
+
+struct prda_sys {
+	pid_t t_pid;
+        u32   t_hint;
+        u32   t_dlactseq;
+        u32   t_fpflags;
+        u32   t_prid;		/* processor type, $prid CP0 register */
+        u32   t_dlendseq;
+        u64   t_unused1[5];
+        pid_t t_rpid;
+        s32   t_resched;
+        u32   t_unused[8];
+        u32   t_cpu;		/* current/last cpu */
+
+	/* FIXME: The signal information, not supported by Linux now */
+	u32   t_flags;		/* if true, then the sigprocmask is in userspace */
+	u32   t_sigprocmask [1]; /* the sigprocmask */
+};
+
+struct prda {
+	char fill [0xe00];
+	struct prda_sys prda_sys;
+};
+
+#define t_sys           prda_sys
+
+ptrdiff_t prctl (int op, int v1, int v2);
+
+#endif