protocol: introduce gsm_03_41.h

This currently contains definitions for the BTS->MS SMSCB message.

Signed-off-by: Alex Badea <vamposdecampos@gmail.com>
diff --git a/include/osmocore/protocol/Makefile.am b/include/osmocore/protocol/Makefile.am
index 5df9fe7..03a4849 100644
--- a/include/osmocore/protocol/Makefile.am
+++ b/include/osmocore/protocol/Makefile.am
@@ -1,4 +1,6 @@
-osmocore_proto_HEADERS = gsm_04_08.h gsm_04_11.h gsm_04_80.h gsm_08_58.h \
-			 gsm_12_21.h gsm_08_08.h gsm_04_12.h
+osmocore_proto_HEADERS = gsm_03_41.h \
+			 gsm_04_08.h gsm_04_11.h gsm_04_12.h gsm_04_80.h \
+			 gsm_08_08.h gsm_08_58.h \
+			 gsm_12_21.h
 
 osmocore_protodir = $(includedir)/osmocore/protocol
diff --git a/include/osmocore/protocol/gsm_03_41.h b/include/osmocore/protocol/gsm_03_41.h
new file mode 100644
index 0000000..250d667
--- /dev/null
+++ b/include/osmocore/protocol/gsm_03_41.h
@@ -0,0 +1,34 @@
+#ifndef PROTO_GSM_03_41_H
+#define PROTO_GSM_03_41_H
+
+#include <stdint.h>
+
+/* GSM TS 03.41 definitions */
+
+/* Chapter 9.3.2 */
+struct gsm341_ms_message {
+	struct {
+		uint8_t code_hi:6;
+		uint8_t gs:2;
+		uint8_t update:2;
+		uint8_t code_lo:6;
+	} serial;
+	uint16_t msg_id;
+	struct {
+		uint8_t language:4;
+		uint8_t group:4;
+	} dcs;
+	struct {
+		uint8_t total:4;
+		uint8_t current:4;
+	} page;
+	uint8_t data[0];
+} __attribute__((packed));
+
+/* Section 9.3.2.1 - Geographical Scope */
+#define GSM341_GS_CELL_WIDE_IMMED	0
+#define GSM341_GS_PLMN_WIDE		1
+#define GSM341_GS_LA_WIDE		2
+#define GSM341_GS_CELL_WIDE		3
+
+#endif /* PROTO_GSM_03_41_H */