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authorTom2011-08-16 13:19:29 +0200
committerTom2011-08-16 13:19:29 +0200
commit7be0213030d2ce50e618e72b5a90e4c5b63c59a4 (patch)
tree98f7f3b0d38c863153f6d95a7129d867c43b652a /Src/osmocombb/src/target/firmware/layer1/prim_fbsb.c
parentremoved whole lib since compiled files were on index (diff)
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checked in clean osmocombb lib
Diffstat (limited to 'Src/osmocombb/src/target/firmware/layer1/prim_fbsb.c')
-rw-r--r--Src/osmocombb/src/target/firmware/layer1/prim_fbsb.c573
1 files changed, 573 insertions, 0 deletions
diff --git a/Src/osmocombb/src/target/firmware/layer1/prim_fbsb.c b/Src/osmocombb/src/target/firmware/layer1/prim_fbsb.c
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--- /dev/null
+++ b/Src/osmocombb/src/target/firmware/layer1/prim_fbsb.c
@@ -0,0 +1,573 @@
+/* Layer 1 - FCCH and SCH burst handling */
+
+/* (C) 2010 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 General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <defines.h>
+#include <debug.h>
+#include <memory.h>
+#include <byteorder.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/core/msgb.h>
+#include <calypso/dsp_api.h>
+#include <calypso/irq.h>
+#include <calypso/tpu.h>
+#include <calypso/tsp.h>
+#include <calypso/dsp.h>
+#include <calypso/timer.h>
+#include <comm/sercomm.h>
+
+#include <layer1/sync.h>
+#include <layer1/afc.h>
+#include <layer1/toa.h>
+#include <layer1/tdma_sched.h>
+#include <layer1/mframe_sched.h>
+#include <layer1/tpu_window.h>
+#include <layer1/l23_api.h>
+
+#include <l1ctl_proto.h>
+
+#define FB0_RETRY_COUNT 3
+#define AFC_RETRY_COUNT 30
+
+extern uint16_t rf_arfcn; // TODO
+
+struct mon_state {
+ uint32_t fnr_report; /* frame number when DSP reported it */
+ int attempt; /* which attempt was this ? */
+
+ int16_t toa;
+ uint16_t pm;
+ uint16_t angle;
+ uint16_t snr;
+
+ /* computed values */
+ int16_t freq_diff;
+
+ /* Sync Burst (SB) */
+ uint8_t bsic;
+ struct gsm_time time;
+};
+
+struct l1a_fb_state {
+ struct mon_state mon;
+ struct l1ctl_fbsb_req req;
+ int16_t initial_freq_err;
+ uint8_t fb_retries;
+ uint8_t afc_retries;
+};
+
+static struct l1a_fb_state fbs;
+static struct mon_state *last_fb = &fbs.mon;
+
+static void dump_mon_state(struct mon_state *fb)
+{
+#if 0
+ printf("(%u:%u): TOA=%5u, Power=%4ddBm, Angle=%5dHz, "
+ "SNR=%04x(%d.%u) OFFSET=%u SYNCHRO=%u\n",
+ fb->fnr_report, fb->attempt, fb->toa,
+ agc_inp_dbm8_by_pm(fb->pm)/8, ANGLE_TO_FREQ(fb->angle),
+ fb->snr, l1s_snr_int(fb->snr), l1s_snr_fract(fb->snr),
+ tpu_get_offset(), tpu_get_synchro());
+#else
+ printf("(%u:%u): TOA=%5u, Power=%4ddBm, Angle=%5dHz\n",
+ fb->fnr_report, fb->attempt, fb->toa,
+ agc_inp_dbm8_by_pm(fb->pm)/8, ANGLE_TO_FREQ(fb->angle));
+#endif
+}
+
+static int l1ctl_fbsb_resp(uint8_t res)
+{
+ struct msgb *msg;
+ struct l1ctl_fbsb_conf *resp;
+
+ msg = l1_create_l2_msg(L1CTL_FBSB_CONF, fbs.mon.time.fn,
+ l1s_snr_int(fbs.mon.snr),
+ fbs.req.band_arfcn);
+ if (!msg)
+ return -ENOMEM;
+
+ resp = (struct l1ctl_fbsb_conf *) msgb_put(msg, sizeof(*resp));
+ resp->initial_freq_err = htons(fbs.initial_freq_err);
+ resp->result = res;
+ resp->bsic = fbs.mon.bsic;
+
+ /* no need to set BSIC, as it is never used here */
+ l1_queue_for_l2(msg);
+
+ return 0;
+}
+
+/* SCH Burst Detection ********************************************************/
+
+/* determine the GSM time and BSIC from a Sync Burst */
+static uint8_t l1s_decode_sb(struct gsm_time *time, uint32_t sb)
+{
+ uint8_t bsic = (sb >> 2) & 0x3f;
+ uint8_t t3p;
+
+ memset(time, 0, sizeof(*time));
+
+ /* TS 05.02 Chapter 3.3.2.2.1 SCH Frame Numbers */
+ time->t1 = ((sb >> 23) & 1) | ((sb >> 7) & 0x1fe) | ((sb << 9) & 0x600);
+ time->t2 = (sb >> 18) & 0x1f;
+ t3p = ((sb >> 24) & 1) | ((sb >> 15) & 6);
+ time->t3 = t3p*10 + 1;
+
+ /* TS 05.02 Chapter 4.3.3 TDMA frame number */
+ time->fn = gsm_gsmtime2fn(time);
+
+ time->tc = (time->fn / 51) % 8;
+
+ return bsic;
+}
+
+static void read_sb_result(struct mon_state *st, int attempt)
+{
+ st->toa = dsp_api.db_r->a_serv_demod[D_TOA];
+ st->pm = dsp_api.db_r->a_serv_demod[D_PM]>>3;
+ st->angle = dsp_api.db_r->a_serv_demod[D_ANGLE];
+ st->snr = dsp_api.db_r->a_serv_demod[D_SNR];
+
+ st->freq_diff = ANGLE_TO_FREQ(st->angle);
+ st->fnr_report = l1s.current_time.fn;
+ st->attempt = attempt;
+
+ dump_mon_state(st);
+
+ if (st->snr > AFC_SNR_THRESHOLD)
+ afc_input(st->freq_diff, rf_arfcn, 1);
+ else
+ afc_input(st->freq_diff, rf_arfcn, 0);
+
+ dsp_api.r_page_used = 1;
+}
+
+/* Note: When we get the SB response, it is 2 TDMA frames after the SB
+ * actually happened, as it is a "C W W R" task */
+#define SB2_LATENCY 2
+
+static int l1s_sbdet_resp(__unused uint8_t p1, uint8_t attempt,
+ __unused uint16_t p3)
+{
+ uint32_t sb;
+ int qbits, fn_offset;
+ struct l1_cell_info *cinfo = &l1s.serving_cell;
+ int fnr_delta, bits_delta;
+ struct l1ctl_sync_new_ccch_resp *l1;
+ struct msgb *msg;
+
+ putchart('s');
+
+ if (dsp_api.db_r->a_sch[0] & (1<<B_SCH_CRC)) {
+ /* mark READ page as being used */
+ dsp_api.r_page_used = 1;
+
+ /* after 2nd attempt, we failed */
+ if (attempt == 2) {
+ last_fb->attempt = 13;
+ l1s_compl_sched(L1_COMPL_FB);
+ }
+
+ /* after 1st attempt, we simply wait for 2nd */
+ return 0;
+ }
+
+ printf("SB%d ", attempt);
+ read_sb_result(last_fb, attempt);
+
+ sb = dsp_api.db_r->a_sch[3] | dsp_api.db_r->a_sch[4] << 16;
+ fbs.mon.bsic = l1s_decode_sb(&fbs.mon.time, sb);
+ printf("=> SB 0x%08x: BSIC=%u ", sb, fbs.mon.bsic);
+ l1s_time_dump(&fbs.mon.time);
+
+ l1s.serving_cell.bsic = fbs.mon.bsic;
+
+ /* calculate synchronisation value (TODO: only complete for qbits) */
+ last_fb->toa -= 23;
+ qbits = last_fb->toa * 4;
+ fn_offset = l1s.current_time.fn; // TODO
+
+ if (qbits > QBITS_PER_TDMA) {
+ qbits -= QBITS_PER_TDMA;
+ fn_offset -= 1;
+ } else if (qbits < 0) {
+ qbits += QBITS_PER_TDMA;
+ fn_offset += 1;
+ }
+
+ fnr_delta = last_fb->fnr_report - attempt;
+ bits_delta = fnr_delta * BITS_PER_TDMA;
+
+ cinfo->fn_offset = fnr_delta;
+ cinfo->time_alignment = qbits;
+ cinfo->arfcn = rf_arfcn;
+
+ if (last_fb->toa > bits_delta)
+ printf("=> DSP reports SB in bit that is %d bits in the "
+ "future?!?\n", last_fb->toa - bits_delta);
+ else
+ printf(" qbits=%u\n", qbits);
+
+ synchronize_tdma(&l1s.serving_cell);
+
+ /* if we have recived a SYNC burst, update our local GSM time */
+ gsm_fn2gsmtime(&l1s.current_time, fbs.mon.time.fn + SB2_LATENCY);
+ /* compute next time from new current time */
+ l1s.next_time = l1s.current_time;
+ l1s_time_inc(&l1s.next_time, 1);
+
+ /* If we call tdma_sched_reset(), which is only needed if there
+ * are further l1s_sbdet_resp() scheduled, we will bring
+ * dsp_api.db_r and dsp_api.db_w out of sync because we changed
+ * dsp_api.db_w for l1s_sbdet_cmd() and canceled
+ * l1s_sbdet_resp() which would change dsp_api.db_r. The DSP
+ * however expects dsp_api.db_w and dsp_api.db_r to be in sync
+ * (either "0 - 0" or "1 - 1"). So we have to bring dsp_api.db_w
+ * and dsp_api.db_r into sync again, otherwise NB reading will
+ * complain. We probably don't need the Abort command and could
+ * just bring dsp_api.db_w and dsp_api.db_r into sync. */
+ if (attempt != 2) {
+ tdma_sched_reset();
+ l1s_dsp_abort();
+ }
+
+ l1s_reset_hw();
+ /* enable the MF Task for BCCH reading */
+ mframe_enable(MF_TASK_BCCH_NORM);
+ if (l1s.serving_cell.ccch_mode == CCCH_MODE_COMBINED)
+ mframe_enable(MF_TASK_CCCH_COMB);
+ else if (l1s.serving_cell.ccch_mode == CCCH_MODE_NON_COMBINED)
+ mframe_enable(MF_TASK_CCCH);
+
+ l1s_compl_sched(L1_COMPL_FB);
+
+ return 0;
+}
+
+static int l1s_sbdet_cmd(__unused uint8_t p1, __unused uint8_t p2,
+ __unused uint16_t p3)
+{
+ putchart('S');
+
+ fbs.mon.bsic = 0;
+ fbs.mon.time.fn = 0;
+
+ dsp_api.db_w->d_task_md = SB_DSP_TASK;
+ dsp_api.ndb->d_fb_mode = 0; /* wideband search */
+
+ /* Program TPU */
+ l1s_rx_win_ctrl(rf_arfcn, L1_RXWIN_SB, 0);
+
+ return 0;
+}
+
+/* This is how it is done by the TSM30 */
+static const struct tdma_sched_item sb_sched_set[] = {
+ SCHED_ITEM_DT(l1s_sbdet_cmd, 0, 0, 1), SCHED_END_FRAME(),
+ SCHED_ITEM_DT(l1s_sbdet_cmd, 0, 0, 2), SCHED_END_FRAME(),
+ SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_sbdet_resp, -4, 0, 1), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_sbdet_resp, -4, 0, 2), SCHED_END_FRAME(),
+ SCHED_END_SET()
+};
+
+void l1s_sb_test(uint8_t base_fn)
+{
+ tdma_schedule_set(base_fn, sb_sched_set, 0);
+}
+/* FCCH Burst *****************************************************************/
+
+static int read_fb_result(struct mon_state *st, int attempt)
+{
+ st->toa = dsp_api.ndb->a_sync_demod[D_TOA];
+ st->pm = dsp_api.ndb->a_sync_demod[D_PM]>>3;
+ st->angle = dsp_api.ndb->a_sync_demod[D_ANGLE];
+ st->snr = dsp_api.ndb->a_sync_demod[D_SNR];
+
+ //last_fb->angle = clip_int16(last_fb->angle, AFC_MAX_ANGLE);
+ st->freq_diff = ANGLE_TO_FREQ(last_fb->angle);
+ st->fnr_report = l1s.current_time.fn;
+ st->attempt = attempt;
+
+ dump_mon_state(st);
+
+ dsp_api.ndb->d_fb_det = 0;
+ dsp_api.ndb->a_sync_demod[D_TOA] = 0; /* TSM30 does it (really needed ?) */
+
+ /* Update AFC with current frequency offset */
+ afc_correct(st->freq_diff, rf_arfcn);
+
+ //tpu_dsp_frameirq_enable();
+ return 1;
+}
+
+static void fbinfo2cellinfo(struct l1_cell_info *cinfo,
+ const struct mon_state *mon)
+{
+ int ntdma, qbits, fn_offset, fnr_delta, bits_delta;
+
+ /* FIXME: where did this magic 23 come from? */
+ last_fb->toa -= 23;
+
+ if (last_fb->toa < 0) {
+ qbits = (last_fb->toa + BITS_PER_TDMA) * 4;
+ ntdma = -1;
+ } else {
+ ntdma = (last_fb->toa) / BITS_PER_TDMA;
+ qbits = (last_fb->toa - ntdma * BITS_PER_TDMA) * 4;
+ }
+
+ fn_offset = l1s.current_time.fn - last_fb->attempt + ntdma;
+ fnr_delta = last_fb->fnr_report - last_fb->attempt;
+ bits_delta = fnr_delta * BITS_PER_TDMA;
+
+ cinfo->fn_offset = fnr_delta;
+ cinfo->time_alignment = qbits;
+ cinfo->arfcn = rf_arfcn;
+
+ if (last_fb->toa > bits_delta)
+ printf("=> DSP reports FB in bit that is %d bits in "
+ "the future?!?\n", last_fb->toa - bits_delta);
+ else {
+ int fb_fnr = (last_fb->fnr_report - last_fb->attempt)
+ + last_fb->toa/BITS_PER_TDMA;
+ printf("=>FB @ FNR %u fn_offset=%d qbits=%u\n",
+ fb_fnr, fn_offset, qbits);
+ }
+}
+
+/* scheduler callback to issue a FB detection task to the DSP */
+static int l1s_fbdet_cmd(__unused uint8_t p1, __unused uint8_t p2,
+ uint16_t fb_mode)
+{
+ if (fb_mode == 0) {
+ putchart('F');
+ } else {
+ putchart('V');
+ }
+
+ l1s.fb.mode = fb_mode;
+
+ /* Tell the RF frontend to set the gain appropriately */
+ rffe_compute_gain(-85, CAL_DSP_TGT_BB_LVL);
+
+ /* Program DSP */
+ dsp_api.db_w->d_task_md = FB_DSP_TASK; /* maybe with I/Q swap? */
+ dsp_api.ndb->d_fb_mode = fb_mode;
+
+ /* Program TPU */
+ l1s_rx_win_ctrl(fbs.req.band_arfcn, L1_RXWIN_FB, 0);
+
+ return 0;
+}
+
+#if 0
+#define FB0_SNR_THRESH 2000
+#define FB1_SNR_THRESH 3000
+#else
+#define FB0_SNR_THRESH 0
+#define FB1_SNR_THRESH 0
+#endif
+
+static const struct tdma_sched_item fb_sched_set[];
+
+/* scheduler callback to check for a FB detection response */
+static int l1s_fbdet_resp(__unused uint8_t p1, uint8_t attempt,
+ uint16_t fb_mode)
+{
+ putchart('f');
+
+ if (!dsp_api.ndb->d_fb_det) {
+ /* we did not detect a FB */
+
+ /* attempt < 12, do nothing */
+ if (attempt < 12)
+ return 0;
+
+ /* attempt >= 12, we simply don't find one */
+
+ /* If we don't reset here, we get DSP DMA errors */
+ tdma_sched_reset();
+
+ if (fbs.fb_retries < FB0_RETRY_COUNT) {
+ /* retry once more */
+ tdma_schedule_set(1, fb_sched_set, 0);
+ fbs.fb_retries++;
+ } else {
+ last_fb->attempt = 13;
+ l1s_compl_sched(L1_COMPL_FB);
+ }
+
+ return 0;
+ }
+
+ /* We found a frequency burst, reset everything */
+ l1s_reset_hw();
+
+ printf("FB%u ", dsp_api.ndb->d_fb_mode);
+ read_fb_result(last_fb, attempt);
+
+ /* if this is the first success, save freq err */
+ if (!fbs.initial_freq_err)
+ fbs.initial_freq_err = last_fb->freq_diff;
+
+ /* If we don't reset here, we get DSP DMA errors */
+ tdma_sched_reset();
+
+ /* Immediately schedule further TDMA tasklets, if requested. Doing
+ * this directly from L1S means we can do this quickly without any
+ * additional delays */
+ if (fb_mode == 0) {
+ if (fbs.req.flags & L1CTL_FBSB_F_FB1) {
+ /* If we don't reset here, we get DSP DMA errors */
+ tdma_sched_reset();
+ /* FIXME: don't only use the last but an average */
+ if (abs(last_fb->freq_diff) < fbs.req.freq_err_thresh1 &&
+ last_fb->snr > FB0_SNR_THRESH) {
+ /* continue with FB1 task in DSP */
+ tdma_schedule_set(1, fb_sched_set, 1);
+ } else {
+ if (fbs.afc_retries < AFC_RETRY_COUNT) {
+ tdma_schedule_set(1, fb_sched_set, 0);
+ fbs.afc_retries++;
+ } else {
+ /* Abort */
+ last_fb->attempt = 13;
+ l1s_compl_sched(L1_COMPL_FB);
+ }
+ }
+ } else
+ l1s_compl_sched(L1_COMPL_FB);
+ } else if (fb_mode == 1) {
+ if (fbs.req.flags & L1CTL_FBSB_F_SB) {
+
+ int ntdma, qbits;
+ /* FIXME: where did this magic 23 come from? */
+ last_fb->toa -= 23;
+
+ if (last_fb->toa < 0) {
+ qbits = (last_fb->toa + BITS_PER_TDMA) * 4;
+ ntdma = -1;
+ } else {
+ ntdma = (last_fb->toa) / BITS_PER_TDMA;
+ qbits = (last_fb->toa - ntdma * BITS_PER_TDMA) * 4;
+ }
+
+
+ int fn_offset = l1s.current_time.fn - last_fb->attempt + ntdma;
+ int delay = fn_offset + 11 - l1s.current_time.fn - 1;
+ printf(" fn_offset=%d (fn=%u + attempt=%u + ntdma = %d)\m",
+ fn_offset, l1s.current_time.fn, last_fb->attempt, ntdma);
+ printf(" delay=%d (fn_offset=%d + 11 - fn=%u - 1\n", delay,
+ fn_offset, l1s.current_time.fn);
+ printf(" scheduling next FB/SB detection task with delay %u\n", delay);
+ if (abs(last_fb->freq_diff) < fbs.req.freq_err_thresh2 &&
+ last_fb->snr > FB1_SNR_THRESH) {
+ /* synchronize before reading SB */
+ fbinfo2cellinfo(&l1s.serving_cell, last_fb);
+ synchronize_tdma(&l1s.serving_cell);
+ tdma_schedule_set(delay, sb_sched_set, 0);
+ } else
+ tdma_schedule_set(delay, fb_sched_set, 1);
+ } else
+ l1s_compl_sched(L1_COMPL_FB);
+ }
+
+ return 0;
+}
+
+/* FB detection */
+static const struct tdma_sched_item fb_sched_set[] = {
+ SCHED_ITEM_DT(l1s_fbdet_cmd, 0, 0, 0), SCHED_END_FRAME(),
+ SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 1), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 2), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 3), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 4), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 5), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 6), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 7), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 8), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 9), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 10), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 11), SCHED_END_FRAME(),
+ SCHED_ITEM(l1s_fbdet_resp, -4, 0, 12), SCHED_END_FRAME(),
+ SCHED_END_SET()
+};
+
+/* Asynchronous completion handler for FB detection */
+static void l1a_fb_compl(__unused enum l1_compl c)
+{
+ struct l1_cell_info *cinfo = &l1s.serving_cell;
+
+ if (last_fb->attempt >= 13) {
+ /* FB detection failed, signal this via L1CTL */
+ return l1ctl_fbsb_resp(255);
+ }
+
+ /* FIME: use l1s.neigh_cell[fbs.cinfo_idx] */
+ fbinfo2cellinfo(&l1s.serving_cell, last_fb);
+
+ /* send FBSB_CONF success message via L1CTL */
+ l1ctl_fbsb_resp(0);
+}
+
+void l1s_fbsb_req(uint8_t base_fn, struct l1ctl_fbsb_req *req)
+{
+ /* copy + endian convert request data */
+ fbs.req.band_arfcn = ntohs(req->band_arfcn);
+ fbs.req.timeout = ntohs(req->timeout);
+ fbs.req.freq_err_thresh1 = ntohs(req->freq_err_thresh1);
+ fbs.req.freq_err_thresh2 = ntohs(req->freq_err_thresh2);
+ fbs.req.num_freqerr_avg = req->num_freqerr_avg;
+ fbs.req.flags = req->flags;
+ fbs.req.sync_info_idx = req->sync_info_idx;
+
+ /* clear initial frequency error */
+ fbs.initial_freq_err = 0;
+ fbs.fb_retries = 0;
+ fbs.afc_retries = 0;
+
+ /* Make sure we start at a 'center' AFCDAC output value */
+ afc_reset();
+
+ /* Reset the TOA loop counters */
+ toa_reset();
+
+ if (fbs.req.flags & L1CTL_FBSB_F_FB0)
+ tdma_schedule_set(base_fn, fb_sched_set, 0);
+ else if (fbs.req.flags & L1CTL_FBSB_F_FB1)
+ tdma_schedule_set(base_fn, fb_sched_set, 0);
+ else if (fbs.req.flags & L1CTL_FBSB_F_SB)
+ tdma_schedule_set(base_fn, sb_sched_set, 0);
+
+}
+
+static __attribute__ ((constructor)) void l1s_prim_fbsb_init(void)
+{
+ l1s.completion[L1_COMPL_FB] = &l1a_fb_compl;
+}