diff --git a/src/Makefile.am b/src/Makefile.am
index 2c73af6..5d8343c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,108 +1,12 @@
-# This is _NOT_ the library release version, it's an API version.
-# Please read chapter "Library interface versions" of the libtool documentation
-# before making any modifications: https://www.gnu.org/software/libtool/manual/html_node/Versioning.html
-LIBVERSION=19:0:0
-
-AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include
-AM_CFLAGS = -Wall $(TALLOC_CFLAGS) $(PTHREAD_CFLAGS) $(LIBSCTP_CFLAGS) $(LIBMNL_CFLAGS)
-
-if ENABLE_PSEUDOTALLOC
-AM_CPPFLAGS += -I$(top_srcdir)/src/pseudotalloc
-endif
-
-lib_LTLIBRARIES = libosmocore.la
-
-libosmocore_la_LIBADD = $(BACKTRACE_LIB) $(TALLOC_LIBS) $(LIBRARY_RT) $(PTHREAD_LIBS) $(LIBSCTP_LIBS)
-libosmocore_la_SOURCES = context.c timer.c timer_gettimeofday.c timer_clockgettime.c \
-			 select.c signal.c msgb.c bits.c \
-			 bitvec.c bitcomp.c counter.c fsm.c \
-			 write_queue.c utils.c socket.c \
-			 logging.c logging_syslog.c logging_gsmtap.c rate_ctr.c \
-			 gsmtap_util.c crc16.c panic.c backtrace.c \
-			 conv.c application.c rbtree.c strrb.c \
-			 loggingrb.c crc8gen.c crc16gen.c crc32gen.c crc64gen.c \
-			 macaddr.c stat_item.c stats.c stats_statsd.c prim.c \
-			 stats_tcp.c \
-			 conv_acc.c conv_acc_generic.c sercomm.c prbs.c \
-			 isdnhdlc.c \
-			 tdef.c \
-			 thread.c \
-			 time_cc.c \
-			 sockaddr_str.c \
-			 use_count.c \
-			 exec.c \
-			 it_q.c \
-			 probes.d \
-			 base64.c \
-			 $(NULL)
-
-if HAVE_SSSE3
-libosmocore_la_SOURCES += conv_acc_sse.c
-if HAVE_SSE4_1
-conv_acc_sse.lo : AM_CFLAGS += -mssse3 -msse4.1
-else
-conv_acc_sse.lo : AM_CFLAGS += -mssse3
-endif
-
-if HAVE_AVX2
-libosmocore_la_SOURCES += conv_acc_sse_avx.c
-if HAVE_SSE4_1
-conv_acc_sse_avx.lo : AM_CFLAGS += -mssse3 -mavx2 -msse4.1
-else
-conv_acc_sse_avx.lo : AM_CFLAGS += -mssse3 -mavx2
-endif
-endif
-endif
-
-if HAVE_NEON
-libosmocore_la_SOURCES += conv_acc_neon.c
-# conv_acc_neon.lo : AM_CFLAGS += -mfpu=neon no, could as well be vfp with neon
-endif
-
-BUILT_SOURCES = crc8gen.c crc16gen.c crc32gen.c crc64gen.c
-
-EXTRA_DIST = \
-	conv_acc_sse_impl.h \
-	conv_acc_neon_impl.h \
-	crcXXgen.c.tpl \
-	stat_item_internal.h \
-	$(NULL)
-
-libosmocore_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
-
-if ENABLE_PLUGIN
-libosmocore_la_SOURCES += plugin.c
-libosmocore_la_LIBADD += $(LIBRARY_DLOPEN)
-endif
-
-if ENABLE_MSGFILE
-libosmocore_la_SOURCES += msgfile.c
-endif
-
-if ENABLE_SERIAL
-libosmocore_la_SOURCES += serial.c
-endif
-
-if ENABLE_SYSTEMD_LOGGING
-libosmocore_la_SOURCES += logging_systemd.c
-libosmocore_la_LIBADD += $(SYSTEMD_LIBS)
-endif
-
-if ENABLE_LIBMNL
-libosmocore_la_SOURCES += mnl.c
-libosmocore_la_LIBADD += $(LIBMNL_LIBS)
-endif
-
-if ENABLE_SYSTEMTAP
-probes.h: probes.d
-	$(DTRACE) -C -h -s $< -o $@
-
-probes.lo: probes.d
-	$(LIBTOOL) --mode=compile $(AM_V_lt) --tag=CC env CFLAGS="$(CFLAGS)" $(DTRACE) -C -G -s $< -o $@
-
-BUILT_SOURCES += probes.h probes.lo
-libosmocore_la_LIBADD += probes.lo
-endif
-
-crc%gen.c: crcXXgen.c.tpl
-	$(AM_V_GEN)sed -e's/XX/$*/g' $< > $@
+SUBDIRS = \
+	core \
+	vty \
+	codec \
+	gsm \
+	coding \
+	gb \
+	ctrl \
+	pseudotalloc \
+	sim \
+	usb \
+	$(NULL)
\ No newline at end of file
diff --git a/src/codec/Makefile.am b/src/codec/Makefile.am
index de8de1b..c16ce9a 100644
--- a/src/codec/Makefile.am
+++ b/src/codec/Makefile.am
@@ -15,4 +15,4 @@
 
 libosmocodec_la_SOURCES = gsm610.c gsm620.c gsm660.c gsm690.c ecu.c ecu_fr.c
 libosmocodec_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
-libosmocodec_la_LIBADD = $(top_builddir)/src/libosmocore.la
+libosmocodec_la_LIBADD = $(top_builddir)/src/core/libosmocore.la
diff --git a/src/coding/Makefile.am b/src/coding/Makefile.am
index 5ce3cbf..d856918 100644
--- a/src/coding/Makefile.am
+++ b/src/coding/Makefile.am
@@ -27,9 +27,11 @@
 	$(LIBVERSION) \
 	-no-undefined \
 	$(TALLOC_LIBS)
+
 libosmocoding_la_LIBADD = \
-	../libosmocore.la \
-	../gsm/libosmogsm.la \
-	../codec/libosmocodec.la
+	$(top_builddir)/src/core/libosmocore.la \
+	$(top_builddir)/src/gsm/libosmogsm.la \
+	$(top_builddir)/src/codec/libosmocodec.la \
+	$(NULL)
 
 EXTRA_DIST = libosmocoding.map
diff --git a/src/core/Makefile.am b/src/core/Makefile.am
new file mode 100644
index 0000000..2c73af6
--- /dev/null
+++ b/src/core/Makefile.am
@@ -0,0 +1,108 @@
+# This is _NOT_ the library release version, it's an API version.
+# Please read chapter "Library interface versions" of the libtool documentation
+# before making any modifications: https://www.gnu.org/software/libtool/manual/html_node/Versioning.html
+LIBVERSION=19:0:0
+
+AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include
+AM_CFLAGS = -Wall $(TALLOC_CFLAGS) $(PTHREAD_CFLAGS) $(LIBSCTP_CFLAGS) $(LIBMNL_CFLAGS)
+
+if ENABLE_PSEUDOTALLOC
+AM_CPPFLAGS += -I$(top_srcdir)/src/pseudotalloc
+endif
+
+lib_LTLIBRARIES = libosmocore.la
+
+libosmocore_la_LIBADD = $(BACKTRACE_LIB) $(TALLOC_LIBS) $(LIBRARY_RT) $(PTHREAD_LIBS) $(LIBSCTP_LIBS)
+libosmocore_la_SOURCES = context.c timer.c timer_gettimeofday.c timer_clockgettime.c \
+			 select.c signal.c msgb.c bits.c \
+			 bitvec.c bitcomp.c counter.c fsm.c \
+			 write_queue.c utils.c socket.c \
+			 logging.c logging_syslog.c logging_gsmtap.c rate_ctr.c \
+			 gsmtap_util.c crc16.c panic.c backtrace.c \
+			 conv.c application.c rbtree.c strrb.c \
+			 loggingrb.c crc8gen.c crc16gen.c crc32gen.c crc64gen.c \
+			 macaddr.c stat_item.c stats.c stats_statsd.c prim.c \
+			 stats_tcp.c \
+			 conv_acc.c conv_acc_generic.c sercomm.c prbs.c \
+			 isdnhdlc.c \
+			 tdef.c \
+			 thread.c \
+			 time_cc.c \
+			 sockaddr_str.c \
+			 use_count.c \
+			 exec.c \
+			 it_q.c \
+			 probes.d \
+			 base64.c \
+			 $(NULL)
+
+if HAVE_SSSE3
+libosmocore_la_SOURCES += conv_acc_sse.c
+if HAVE_SSE4_1
+conv_acc_sse.lo : AM_CFLAGS += -mssse3 -msse4.1
+else
+conv_acc_sse.lo : AM_CFLAGS += -mssse3
+endif
+
+if HAVE_AVX2
+libosmocore_la_SOURCES += conv_acc_sse_avx.c
+if HAVE_SSE4_1
+conv_acc_sse_avx.lo : AM_CFLAGS += -mssse3 -mavx2 -msse4.1
+else
+conv_acc_sse_avx.lo : AM_CFLAGS += -mssse3 -mavx2
+endif
+endif
+endif
+
+if HAVE_NEON
+libosmocore_la_SOURCES += conv_acc_neon.c
+# conv_acc_neon.lo : AM_CFLAGS += -mfpu=neon no, could as well be vfp with neon
+endif
+
+BUILT_SOURCES = crc8gen.c crc16gen.c crc32gen.c crc64gen.c
+
+EXTRA_DIST = \
+	conv_acc_sse_impl.h \
+	conv_acc_neon_impl.h \
+	crcXXgen.c.tpl \
+	stat_item_internal.h \
+	$(NULL)
+
+libosmocore_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
+
+if ENABLE_PLUGIN
+libosmocore_la_SOURCES += plugin.c
+libosmocore_la_LIBADD += $(LIBRARY_DLOPEN)
+endif
+
+if ENABLE_MSGFILE
+libosmocore_la_SOURCES += msgfile.c
+endif
+
+if ENABLE_SERIAL
+libosmocore_la_SOURCES += serial.c
+endif
+
+if ENABLE_SYSTEMD_LOGGING
+libosmocore_la_SOURCES += logging_systemd.c
+libosmocore_la_LIBADD += $(SYSTEMD_LIBS)
+endif
+
+if ENABLE_LIBMNL
+libosmocore_la_SOURCES += mnl.c
+libosmocore_la_LIBADD += $(LIBMNL_LIBS)
+endif
+
+if ENABLE_SYSTEMTAP
+probes.h: probes.d
+	$(DTRACE) -C -h -s $< -o $@
+
+probes.lo: probes.d
+	$(LIBTOOL) --mode=compile $(AM_V_lt) --tag=CC env CFLAGS="$(CFLAGS)" $(DTRACE) -C -G -s $< -o $@
+
+BUILT_SOURCES += probes.h probes.lo
+libosmocore_la_LIBADD += probes.lo
+endif
+
+crc%gen.c: crcXXgen.c.tpl
+	$(AM_V_GEN)sed -e's/XX/$*/g' $< > $@
diff --git a/src/application.c b/src/core/application.c
similarity index 100%
rename from src/application.c
rename to src/core/application.c
diff --git a/src/backtrace.c b/src/core/backtrace.c
similarity index 100%
rename from src/backtrace.c
rename to src/core/backtrace.c
diff --git a/src/base64.c b/src/core/base64.c
similarity index 100%
rename from src/base64.c
rename to src/core/base64.c
diff --git a/src/bitcomp.c b/src/core/bitcomp.c
similarity index 100%
rename from src/bitcomp.c
rename to src/core/bitcomp.c
diff --git a/src/bits.c b/src/core/bits.c
similarity index 100%
rename from src/bits.c
rename to src/core/bits.c
diff --git a/src/bitvec.c b/src/core/bitvec.c
similarity index 100%
rename from src/bitvec.c
rename to src/core/bitvec.c
diff --git a/src/context.c b/src/core/context.c
similarity index 100%
rename from src/context.c
rename to src/core/context.c
diff --git a/src/conv.c b/src/core/conv.c
similarity index 100%
rename from src/conv.c
rename to src/core/conv.c
diff --git a/src/conv_acc.c b/src/core/conv_acc.c
similarity index 100%
rename from src/conv_acc.c
rename to src/core/conv_acc.c
diff --git a/src/conv_acc_generic.c b/src/core/conv_acc_generic.c
similarity index 100%
rename from src/conv_acc_generic.c
rename to src/core/conv_acc_generic.c
diff --git a/src/conv_acc_neon.c b/src/core/conv_acc_neon.c
similarity index 100%
rename from src/conv_acc_neon.c
rename to src/core/conv_acc_neon.c
diff --git a/src/conv_acc_neon_impl.h b/src/core/conv_acc_neon_impl.h
similarity index 100%
rename from src/conv_acc_neon_impl.h
rename to src/core/conv_acc_neon_impl.h
diff --git a/src/conv_acc_sse.c b/src/core/conv_acc_sse.c
similarity index 100%
rename from src/conv_acc_sse.c
rename to src/core/conv_acc_sse.c
diff --git a/src/conv_acc_sse_avx.c b/src/core/conv_acc_sse_avx.c
similarity index 100%
rename from src/conv_acc_sse_avx.c
rename to src/core/conv_acc_sse_avx.c
diff --git a/src/conv_acc_sse_impl.h b/src/core/conv_acc_sse_impl.h
similarity index 100%
rename from src/conv_acc_sse_impl.h
rename to src/core/conv_acc_sse_impl.h
diff --git a/src/counter.c b/src/core/counter.c
similarity index 100%
rename from src/counter.c
rename to src/core/counter.c
diff --git a/src/crc16.c b/src/core/crc16.c
similarity index 100%
rename from src/crc16.c
rename to src/core/crc16.c
diff --git a/src/crcXXgen.c.tpl b/src/core/crcXXgen.c.tpl
similarity index 100%
rename from src/crcXXgen.c.tpl
rename to src/core/crcXXgen.c.tpl
diff --git a/src/exec.c b/src/core/exec.c
similarity index 100%
rename from src/exec.c
rename to src/core/exec.c
diff --git a/src/fsm.c b/src/core/fsm.c
similarity index 100%
rename from src/fsm.c
rename to src/core/fsm.c
diff --git a/src/gsmtap_util.c b/src/core/gsmtap_util.c
similarity index 100%
rename from src/gsmtap_util.c
rename to src/core/gsmtap_util.c
diff --git a/src/isdnhdlc.c b/src/core/isdnhdlc.c
similarity index 100%
rename from src/isdnhdlc.c
rename to src/core/isdnhdlc.c
diff --git a/src/it_q.c b/src/core/it_q.c
similarity index 100%
rename from src/it_q.c
rename to src/core/it_q.c
diff --git a/src/logging.c b/src/core/logging.c
similarity index 100%
rename from src/logging.c
rename to src/core/logging.c
diff --git a/src/logging_gsmtap.c b/src/core/logging_gsmtap.c
similarity index 100%
rename from src/logging_gsmtap.c
rename to src/core/logging_gsmtap.c
diff --git a/src/logging_syslog.c b/src/core/logging_syslog.c
similarity index 100%
rename from src/logging_syslog.c
rename to src/core/logging_syslog.c
diff --git a/src/logging_systemd.c b/src/core/logging_systemd.c
similarity index 100%
rename from src/logging_systemd.c
rename to src/core/logging_systemd.c
diff --git a/src/loggingrb.c b/src/core/loggingrb.c
similarity index 100%
rename from src/loggingrb.c
rename to src/core/loggingrb.c
diff --git a/src/macaddr.c b/src/core/macaddr.c
similarity index 100%
rename from src/macaddr.c
rename to src/core/macaddr.c
diff --git a/src/mnl.c b/src/core/mnl.c
similarity index 100%
rename from src/mnl.c
rename to src/core/mnl.c
diff --git a/src/msgb.c b/src/core/msgb.c
similarity index 100%
rename from src/msgb.c
rename to src/core/msgb.c
diff --git a/src/msgfile.c b/src/core/msgfile.c
similarity index 100%
rename from src/msgfile.c
rename to src/core/msgfile.c
diff --git a/src/panic.c b/src/core/panic.c
similarity index 100%
rename from src/panic.c
rename to src/core/panic.c
diff --git a/src/plugin.c b/src/core/plugin.c
similarity index 100%
rename from src/plugin.c
rename to src/core/plugin.c
diff --git a/src/prbs.c b/src/core/prbs.c
similarity index 100%
rename from src/prbs.c
rename to src/core/prbs.c
diff --git a/src/prim.c b/src/core/prim.c
similarity index 100%
rename from src/prim.c
rename to src/core/prim.c
diff --git a/src/probes.d b/src/core/probes.d
similarity index 100%
rename from src/probes.d
rename to src/core/probes.d
diff --git a/src/rate_ctr.c b/src/core/rate_ctr.c
similarity index 100%
rename from src/rate_ctr.c
rename to src/core/rate_ctr.c
diff --git a/src/rbtree.c b/src/core/rbtree.c
similarity index 100%
rename from src/rbtree.c
rename to src/core/rbtree.c
diff --git a/src/select.c b/src/core/select.c
similarity index 100%
rename from src/select.c
rename to src/core/select.c
diff --git a/src/sercomm.c b/src/core/sercomm.c
similarity index 100%
rename from src/sercomm.c
rename to src/core/sercomm.c
diff --git a/src/serial.c b/src/core/serial.c
similarity index 100%
rename from src/serial.c
rename to src/core/serial.c
diff --git a/src/signal.c b/src/core/signal.c
similarity index 100%
rename from src/signal.c
rename to src/core/signal.c
diff --git a/src/sockaddr_str.c b/src/core/sockaddr_str.c
similarity index 100%
rename from src/sockaddr_str.c
rename to src/core/sockaddr_str.c
diff --git a/src/socket.c b/src/core/socket.c
similarity index 100%
rename from src/socket.c
rename to src/core/socket.c
diff --git a/src/stat_item.c b/src/core/stat_item.c
similarity index 100%
rename from src/stat_item.c
rename to src/core/stat_item.c
diff --git a/src/stat_item_internal.h b/src/core/stat_item_internal.h
similarity index 100%
rename from src/stat_item_internal.h
rename to src/core/stat_item_internal.h
diff --git a/src/stats.c b/src/core/stats.c
similarity index 100%
rename from src/stats.c
rename to src/core/stats.c
diff --git a/src/stats_statsd.c b/src/core/stats_statsd.c
similarity index 100%
rename from src/stats_statsd.c
rename to src/core/stats_statsd.c
diff --git a/src/stats_tcp.c b/src/core/stats_tcp.c
similarity index 100%
rename from src/stats_tcp.c
rename to src/core/stats_tcp.c
diff --git a/src/strrb.c b/src/core/strrb.c
similarity index 100%
rename from src/strrb.c
rename to src/core/strrb.c
diff --git a/src/tdef.c b/src/core/tdef.c
similarity index 100%
rename from src/tdef.c
rename to src/core/tdef.c
diff --git a/src/thread.c b/src/core/thread.c
similarity index 100%
rename from src/thread.c
rename to src/core/thread.c
diff --git a/src/time_cc.c b/src/core/time_cc.c
similarity index 100%
rename from src/time_cc.c
rename to src/core/time_cc.c
diff --git a/src/timer.c b/src/core/timer.c
similarity index 100%
rename from src/timer.c
rename to src/core/timer.c
diff --git a/src/timer_clockgettime.c b/src/core/timer_clockgettime.c
similarity index 100%
rename from src/timer_clockgettime.c
rename to src/core/timer_clockgettime.c
diff --git a/src/timer_gettimeofday.c b/src/core/timer_gettimeofday.c
similarity index 100%
rename from src/timer_gettimeofday.c
rename to src/core/timer_gettimeofday.c
diff --git a/src/use_count.c b/src/core/use_count.c
similarity index 100%
rename from src/use_count.c
rename to src/core/use_count.c
diff --git a/src/utils.c b/src/core/utils.c
similarity index 100%
rename from src/utils.c
rename to src/core/utils.c
diff --git a/src/write_queue.c b/src/core/write_queue.c
similarity index 100%
rename from src/write_queue.c
rename to src/core/write_queue.c
diff --git a/src/ctrl/Makefile.am b/src/ctrl/Makefile.am
index e53594d..f149acb 100644
--- a/src/ctrl/Makefile.am
+++ b/src/ctrl/Makefile.am
@@ -13,7 +13,7 @@
 
 libosmoctrl_la_LDFLAGS = $(LTLDFLAGS_OSMOCTRL) -version-info $(LIBVERSION) -no-undefined
 libosmoctrl_la_LIBADD = $(TALLOC_LIBS) \
-	$(top_builddir)/src/libosmocore.la \
+	$(top_builddir)/src/core/libosmocore.la \
 	$(top_builddir)/src/gsm/libosmogsm.la \
 	$(top_builddir)/src/vty/libosmovty.la
 
diff --git a/src/gb/Makefile.am b/src/gb/Makefile.am
index f3bbcfb..32a03c8 100644
--- a/src/gb/Makefile.am
+++ b/src/gb/Makefile.am
@@ -21,7 +21,7 @@
 		-no-undefined \
 		$(NULL)
 libosmogb_la_LIBADD = $(TALLOC_LIBS) \
-		$(top_builddir)/src/libosmocore.la \
+		$(top_builddir)/src/core/libosmocore.la \
 		$(top_builddir)/src/vty/libosmovty.la \
 		$(top_builddir)/src/gsm/libosmogsm.la
 
diff --git a/src/gsm/Makefile.am b/src/gsm/Makefile.am
index 0d66476..eb0f7e4 100644
--- a/src/gsm/Makefile.am
+++ b/src/gsm/Makefile.am
@@ -36,7 +36,7 @@
 			gad.c bsslap.c bssmap_le.c kdf.c iuup.c
 
 libgsmint_la_LDFLAGS = -no-undefined
-libgsmint_la_LIBADD = $(top_builddir)/src/libosmocore.la
+libgsmint_la_LIBADD = $(top_builddir)/src/core/libosmocore.la
 
 libosmogsm_la_SOURCES =
 libosmogsm_la_LDFLAGS = $(LTLDFLAGS_OSMOGSM) -version-info $(LIBVERSION) -no-undefined
diff --git a/src/sim/Makefile.am b/src/sim/Makefile.am
index 3d30506..4ef4490 100644
--- a/src/sim/Makefile.am
+++ b/src/sim/Makefile.am
@@ -20,7 +20,7 @@
 	-no-undefined \
 	$(NULL)
 libosmosim_la_LIBADD = \
-	$(top_builddir)/src/libosmocore.la \
+	$(top_builddir)/src/core/libosmocore.la \
 	$(top_builddir)/src/gsm/libosmogsm.la \
 	$(TALLOC_LIBS)
 if ENABLE_PCSC
diff --git a/src/usb/Makefile.am b/src/usb/Makefile.am
index a1426f9..c8e557b 100644
--- a/src/usb/Makefile.am
+++ b/src/usb/Makefile.am
@@ -17,7 +17,7 @@
 	-no-undefined \
 	$(NULL)
 libosmousb_la_LIBADD = \
-	$(top_builddir)/src/libosmocore.la \
+	$(top_builddir)/src/core/libosmocore.la \
 	$(TALLOC_LIBS) \
 	$(LIBUSB_LIBS)
 
diff --git a/src/vty/Makefile.am b/src/vty/Makefile.am
index 3142d75..c2d133a 100644
--- a/src/vty/Makefile.am
+++ b/src/vty/Makefile.am
@@ -14,5 +14,5 @@
 			fsm_vty.c talloc_ctx_vty.c \
 			cpu_sched_vty.c tdef_vty.c
 libosmovty_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
-libosmovty_la_LIBADD = $(top_builddir)/src/libosmocore.la $(TALLOC_LIBS) $(PTHREAD_LIBS)
+libosmovty_la_LIBADD = $(top_builddir)/src/core/libosmocore.la $(TALLOC_LIBS) $(PTHREAD_LIBS)
 endif