Introduce FSM mm_state_iu_fsm

Implement TS 23.060 6.1.2 Mobility Management States (Iu mode) using
osmocom FSM and drop old implementation.
Most of the logic on each state is still kept in gprs_gmm.c, will be
inserted into the FSM later.

Change-Id: I4c9cf8c27194817c56e8949af0205e1cc14af317

1 files changed, 24 insertions, 0 deletions

diff --git a/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h b/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h
new file mode 100644
index 000000000..7f02bcc45
--- /dev/null
+++ b/include/osmocom/sgsn/gprs_mm_state_iu_fsm.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <osmocom/core/fsm.h>
+
+struct sgsn_mm_ctx;
+
+
+/* TS 23.060 6.1.1 Mobility Management States (A/Gb mode) */
+enum mm_state_iu_fsm_states {
+	ST_PMM_DETACHED,
+	ST_PMM_CONNECTED,
+	ST_PMM_IDLE
+};
+
+enum mm_state_iu_fsm_events {
+	E_PMM_PS_ATTACH,
+	/* E_PS_DETACH, TODO: not used */
+	E_PMM_PS_CONN_RELEASE,
+	E_PMM_PS_CONN_ESTABLISH,
+	E_PMM_IMPLICIT_DETACH, /* = E_PS_ATTACH_REJECT, E_RAU_REJECT */
+	E_PMM_RA_UPDATE, /* = Serving RNC relocation */
+};
+
+extern struct osmo_fsm mm_state_iu_fsm;