re-work original osmo-bts with support for sysmocom femtobts

This code re-works osmo-bts to add support for the upcoming sysmocom BTS.

It also tries to add some level of abstraction between the generic
part of a BTS (A-bis, RSL, OML, data structures, paging scheduling,
BCCH/AGCH scheduling, etc.) and the actual hardware-specific bits.

The hardware-specific bits are currently only implemented for the sysmocom
femtobts, but should be (re-)added for osmocom-bb, as well as a virtual
BTS for simulation purpose later.

The sysmocom bts specific parts require hardware-specific header files
which are (at least currently) not publicly distributed.

1 files changed, 66 insertions, 0 deletions

diff --git a/src/common/sysinfo.c b/src/common/sysinfo.c
new file mode 100644
index 00000000..90141d5b
--- /dev/null
+++ b/src/common/sysinfo.c
@@ -0,0 +1,66 @@
+/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdint.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/sysinfo.h>
+
+#include <osmo-bts/gsm_data.h>
+
+uint8_t *bts_sysinfo_get(struct gsm_bts *bts, struct gsm_time *g_time)
+{
+	/* Apply the rules from 05.02 6.3.1.3 Mapping of BCCH Data */
+	switch (g_time->tc) {
+	case 0:
+		return GSM_BTS_SI(bts, SYSINFO_TYPE_1);
+	case 1:
+		return GSM_BTS_SI(bts, SYSINFO_TYPE_2);
+	case 2:
+		return GSM_BTS_SI(bts, SYSINFO_TYPE_3);
+	case 3:
+		return GSM_BTS_SI(bts, SYSINFO_TYPE_4);
+	case 4:
+		/* 2ter, 2quater, 9, 13 */
+		break;
+	case 5:
+		/* 2ter, 2quater */
+		break;
+	case 6:
+		return GSM_BTS_SI(bts, SYSINFO_TYPE_3);
+	case 7:
+		return GSM_BTS_SI(bts, SYSINFO_TYPE_4);
+	}
+
+	return NULL;
+}
+
+uint8_t *lchan_sacch_get(struct gsm_lchan *lchan, struct gsm_time *g_time)
+{
+	uint32_t tmp;
+
+	for (tmp = lchan->si.last + 1; tmp != lchan->si.last; tmp = (tmp + 1) % 32) {
+		if (lchan->si.valid & (1 << tmp)) {
+			lchan->si.last = tmp;
+			printf("returning SACCH SI type %u\n", tmp);
+			return lchan->si.buf[tmp];
+		}
+	}
+	return NULL;
+}