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2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565 
 kernel/drivers/char/tpm/tpm_tis_core.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (C) 2005, 2006 IBM Corporation
34  * Copyright (C) 2014, 2015 Intel Corporation
....@@ -13,11 +14,6 @@
1314  *
1415  * This device driver implements the TPM interface as defined in
1516  * the TCG TPM Interface Spec version 1.2, revision 1.0.
16
- *
17
- * This program is free software; you can redistribute it and/or
18
- * modify it under the terms of the GNU General Public License as
19
- * published by the Free Software Foundation, version 2 of the
20
- * License.
2117  */
2218 #include <linux/init.h>
2319 #include <linux/module.h>
....@@ -52,6 +48,7 @@
5248 		unsigned long timeout, wait_queue_head_t *queue,
5349 		bool check_cancel)
5450 {
51
+	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
5552 	unsigned long stop;
5653 	long rc;
5754 	u8 status;
....@@ -84,8 +81,8 @@
8481 		}
8582 	} else {
8683 		do {
87
-			usleep_range(TPM_TIMEOUT_USECS_MIN,
88
-				     TPM_TIMEOUT_USECS_MAX);
84
+			usleep_range(priv->timeout_min,
85
+				     priv->timeout_max);
8986 			status = chip->ops->status(chip);
9087 			if ((status & mask) == mask)
9188 				return 0;
....@@ -139,16 +136,27 @@
139136 	return false;
140137 }
141138 
142
-static int release_locality(struct tpm_chip *chip, int l)
139
+static int __tpm_tis_relinquish_locality(struct tpm_tis_data *priv, int l)
143140 {
144
-	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
145
-
146141 	tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
147142 
148143 	return 0;
149144 }
150145 
151
-static int request_locality(struct tpm_chip *chip, int l)
146
+static int tpm_tis_relinquish_locality(struct tpm_chip *chip, int l)
147
+{
148
+	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
149
+
150
+	mutex_lock(&priv->locality_count_mutex);
151
+	priv->locality_count--;
152
+	if (priv->locality_count == 0)
153
+		__tpm_tis_relinquish_locality(priv, l);
154
+	mutex_unlock(&priv->locality_count_mutex);
155
+
156
+	return 0;
157
+}
158
+
159
+static int __tpm_tis_request_locality(struct tpm_chip *chip, int l)
152160 {
153161 	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
154162 	unsigned long stop, timeout;
....@@ -189,6 +197,20 @@
189197 	return -1;
190198 }
191199 
200
+static int tpm_tis_request_locality(struct tpm_chip *chip, int l)
201
+{
202
+	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
203
+	int ret = 0;
204
+
205
+	mutex_lock(&priv->locality_count_mutex);
206
+	if (priv->locality_count == 0)
207
+		ret = __tpm_tis_request_locality(chip, l);
208
+	if (!ret)
209
+		priv->locality_count++;
210
+	mutex_unlock(&priv->locality_count_mutex);
211
+	return ret;
212
+}
213
+
192214 static u8 tpm_tis_status(struct tpm_chip *chip)
193215 {
194216 	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
....@@ -198,6 +220,28 @@
198220 	rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status);
199221 	if (rc < 0)
200222 		return 0;
223
+
224
+	if (unlikely((status & TPM_STS_READ_ZERO) != 0)) {
225
+		if  (!test_and_set_bit(TPM_TIS_INVALID_STATUS, &priv->flags)) {
226
+			/*
227
+			 * If this trips, the chances are the read is
228
+			 * returning 0xff because the locality hasn't been
229
+			 * acquired.  Usually because tpm_try_get_ops() hasn't
230
+			 * been called before doing a TPM operation.
231
+			 */
232
+			dev_err(&chip->dev, "invalid TPM_STS.x 0x%02x, dumping stack for forensics\n",
233
+				status);
234
+
235
+			/*
236
+			 * Dump stack for forensics, as invalid TPM_STS.x could be
237
+			 * potentially triggered by impaired tpm_try_get_ops() or
238
+			 * tpm_find_get_ops().
239
+			 */
240
+			dump_stack();
241
+		}
242
+
243
+		return 0;
244
+	}
201245 
202246 	return status;
203247 }
....@@ -270,6 +314,7 @@
270314 	int size = 0;
271315 	int status;
272316 	u32 expected;
317
+	int rc;
273318 
274319 	if (count < TPM_HEADER_SIZE) {
275320 		size = -EIO;
....@@ -289,8 +334,13 @@
289334 		goto out;
290335 	}
291336 
292
-	size += recv_data(chip, &buf[TPM_HEADER_SIZE],
293
-			  expected - TPM_HEADER_SIZE);
337
+	rc = recv_data(chip, &buf[TPM_HEADER_SIZE],
338
+		       expected - TPM_HEADER_SIZE);
339
+	if (rc < 0) {
340
+		size = rc;
341
+		goto out;
342
+	}
343
+	size += rc;
294344 	if (size < expected) {
295345 		dev_err(&chip->dev, "Unable to read remainder of result\n");
296346 		size = -ETIME;
....@@ -419,10 +469,17 @@
419469 	int rc;
420470 	u32 ordinal;
421471 	unsigned long dur;
472
+	unsigned int try;
422473 
423
-	rc = tpm_tis_send_data(chip, buf, len);
424
-	if (rc < 0)
425
-		return rc;
474
+	for (try = 0; try < TPM_RETRY; try++) {
475
+		rc = tpm_tis_send_data(chip, buf, len);
476
+		if (rc >= 0)
477
+			/* Data transfer done successfully */
478
+			break;
479
+		else if (rc != -EIO)
480
+			/* Data transfer failed, not recoverable */
481
+			return rc;
482
+	}
426483 
427484 	/* go and do it */
428485 	rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
....@@ -432,11 +489,7 @@
432489 	if (chip->flags & TPM_CHIP_FLAG_IRQ) {
433490 		ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
434491 
435
-		if (chip->flags & TPM_CHIP_FLAG_TPM2)
436
-			dur = tpm2_calc_ordinal_duration(chip, ordinal);
437
-		else
438
-			dur = tpm_calc_ordinal_duration(chip, ordinal);
439
-
492
+		dur = tpm_calc_ordinal_duration(chip, ordinal);
440493 		if (wait_for_tpm_stat
441494 		    (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
442495 		     &priv->read_queue, false) < 0) {
....@@ -473,6 +526,84 @@
473526 	return rc;
474527 }
475528 
529
+struct tis_vendor_durations_override {
530
+	u32 did_vid;
531
+	struct tpm1_version version;
532
+	unsigned long durations[3];
533
+};
534
+
535
+static const struct  tis_vendor_durations_override vendor_dur_overrides[] = {
536
+	/* STMicroelectronics 0x104a */
537
+	{ 0x0000104a,
538
+	  { 1, 2, 8, 28 },
539
+	  { (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } },
540
+};
541
+
542
+static void tpm_tis_update_durations(struct tpm_chip *chip,
543
+				     unsigned long *duration_cap)
544
+{
545
+	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
546
+	struct tpm1_version *version;
547
+	u32 did_vid;
548
+	int i, rc;
549
+	cap_t cap;
550
+
551
+	chip->duration_adjusted = false;
552
+
553
+	if (chip->ops->clk_enable != NULL)
554
+		chip->ops->clk_enable(chip, true);
555
+
556
+	rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
557
+	if (rc < 0) {
558
+		dev_warn(&chip->dev, "%s: failed to read did_vid. %d\n",
559
+			 __func__, rc);
560
+		goto out;
561
+	}
562
+
563
+	/* Try to get a TPM version 1.2 or 1.1 TPM_CAP_VERSION_INFO */
564
+	rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
565
+			 "attempting to determine the 1.2 version",
566
+			 sizeof(cap.version2));
567
+	if (!rc) {
568
+		version = &cap.version2.version;
569
+	} else {
570
+		rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
571
+				 "attempting to determine the 1.1 version",
572
+				 sizeof(cap.version1));
573
+
574
+		if (rc)
575
+			goto out;
576
+
577
+		version = &cap.version1;
578
+	}
579
+
580
+	for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) {
581
+		if (vendor_dur_overrides[i].did_vid != did_vid)
582
+			continue;
583
+
584
+		if ((version->major ==
585
+		     vendor_dur_overrides[i].version.major) &&
586
+		    (version->minor ==
587
+		     vendor_dur_overrides[i].version.minor) &&
588
+		    (version->rev_major ==
589
+		     vendor_dur_overrides[i].version.rev_major) &&
590
+		    (version->rev_minor ==
591
+		     vendor_dur_overrides[i].version.rev_minor)) {
592
+
593
+			memcpy(duration_cap,
594
+			       vendor_dur_overrides[i].durations,
595
+			       sizeof(vendor_dur_overrides[i].durations));
596
+
597
+			chip->duration_adjusted = true;
598
+			goto out;
599
+		}
600
+	}
601
+
602
+out:
603
+	if (chip->ops->clk_enable != NULL)
604
+		chip->ops->clk_enable(chip, false);
605
+}
606
+
476607 struct tis_vendor_timeout_override {
477608 	u32 did_vid;
478609 	unsigned long timeout_us[4];
....@@ -484,35 +615,38 @@
484615 			(TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
485616 };
486617 
487
-static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
618
+static void tpm_tis_update_timeouts(struct tpm_chip *chip,
488619 				    unsigned long *timeout_cap)
489620 {
490621 	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
491622 	int i, rc;
492623 	u32 did_vid;
493624 
625
+	chip->timeout_adjusted = false;
626
+
494627 	if (chip->ops->clk_enable != NULL)
495628 		chip->ops->clk_enable(chip, true);
496629 
497630 	rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
498
-	if (rc < 0)
631
+	if (rc < 0) {
632
+		dev_warn(&chip->dev, "%s: failed to read did_vid: %d\n",
633
+			 __func__, rc);
499634 		goto out;
635
+	}
500636 
501637 	for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
502638 		if (vendor_timeout_overrides[i].did_vid != did_vid)
503639 			continue;
504640 		memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
505641 		       sizeof(vendor_timeout_overrides[i].timeout_us));
506
-		rc = true;
642
+		chip->timeout_adjusted = true;
507643 	}
508
-
509
-	rc = false;
510644 
511645 out:
512646 	if (chip->ops->clk_enable != NULL)
513647 		chip->ops->clk_enable(chip, false);
514648 
515
-	return rc;
649
+	return;
516650 }
517651 
518652 /*
....@@ -542,7 +676,7 @@
542676 	if (vendor != TPM_VID_INTEL)
543677 		return 0;
544678 
545
-	if (request_locality(chip, 0) != 0)
679
+	if (tpm_tis_request_locality(chip, 0) != 0)
546680 		return -EBUSY;
547681 
548682 	rc = tpm_tis_send_data(chip, cmd_getticks, len);
....@@ -563,7 +697,7 @@
563697 
564698 out:
565699 	tpm_tis_ready(chip);
566
-	release_locality(chip, priv->locality);
700
+	tpm_tis_relinquish_locality(chip, priv->locality);
567701 
568702 	return rc;
569703 }
....@@ -610,7 +744,9 @@
610744 		wake_up_interruptible(&priv->int_queue);
611745 
612746 	/* Clear interrupts handled with TPM_EOI */
747
+	tpm_tis_request_locality(chip, 0);
613748 	rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt);
749
+	tpm_tis_relinquish_locality(chip, 0);
614750 	if (rc < 0)
615751 		return IRQ_NONE;
616752 
....@@ -618,17 +754,17 @@
618754 	return IRQ_HANDLED;
619755 }
620756 
621
-static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
757
+static void tpm_tis_gen_interrupt(struct tpm_chip *chip)
622758 {
623759 	const char *desc = "attempting to generate an interrupt";
624760 	u32 cap2;
625761 	cap_t cap;
762
+	int ret;
626763 
627764 	if (chip->flags & TPM_CHIP_FLAG_TPM2)
628
-		return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
765
+		ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
629766 	else
630
-		return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc,
631
-				  0);
767
+		ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0);
632768 }
633769 
634770 /* Register the IRQ and issue a command that will cause an interrupt. If an
....@@ -643,60 +779,66 @@
643779 	int rc;
644780 	u32 int_status;
645781 
646
-	if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
647
-			     dev_name(&chip->dev), chip) != 0) {
782
+
783
+	rc = devm_request_threaded_irq(chip->dev.parent, irq, NULL,
784
+				       tis_int_handler, IRQF_ONESHOT | flags,
785
+				       dev_name(&chip->dev), chip);
786
+	if (rc) {
648787 		dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
649788 			 irq);
650789 		return -1;
651790 	}
652791 	priv->irq = irq;
653792 
654
-	rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
655
-			   &original_int_vec);
793
+	rc = tpm_tis_request_locality(chip, 0);
656794 	if (rc < 0)
657795 		return rc;
796
+
797
+	rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
798
+			   &original_int_vec);
799
+	if (rc < 0) {
800
+		tpm_tis_relinquish_locality(chip, priv->locality);
801
+		return rc;
802
+	}
658803 
659804 	rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq);
660805 	if (rc < 0)
661
-		return rc;
806
+		goto restore_irqs;
662807 
663808 	rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status);
664809 	if (rc < 0)
665
-		return rc;
810
+		goto restore_irqs;
666811 
667812 	/* Clear all existing */
668813 	rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status);
669814 	if (rc < 0)
670
-		return rc;
671
-
815
+		goto restore_irqs;
672816 	/* Turn on */
673817 	rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality),
674818 			     intmask | TPM_GLOBAL_INT_ENABLE);
675819 	if (rc < 0)
676
-		return rc;
820
+		goto restore_irqs;
677821 
678822 	priv->irq_tested = false;
679823 
680824 	/* Generate an interrupt by having the core call through to
681825 	 * tpm_tis_send
682826 	 */
683
-	rc = tpm_tis_gen_interrupt(chip);
684
-	if (rc < 0)
685
-		return rc;
827
+	tpm_tis_gen_interrupt(chip);
686828 
829
+restore_irqs:
687830 	/* tpm_tis_send will either confirm the interrupt is working or it
688831 	 * will call disable_irq which undoes all of the above.
689832 	 */
690833 	if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
691
-		rc = tpm_tis_write8(priv, original_int_vec,
692
-				TPM_INT_VECTOR(priv->locality));
693
-		if (rc < 0)
694
-			return rc;
695
-
696
-		return 1;
834
+		tpm_tis_write8(priv, original_int_vec,
835
+			       TPM_INT_VECTOR(priv->locality));
836
+		rc = -1;
697837 	}
698838 
699
-	return 0;
839
+	tpm_tis_relinquish_locality(chip, priv->locality);
840
+
841
+	return rc;
700842 }
701843 
702844 /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
....@@ -806,11 +948,12 @@
806948 	.send = tpm_tis_send,
807949 	.cancel = tpm_tis_ready,
808950 	.update_timeouts = tpm_tis_update_timeouts,
951
+	.update_durations = tpm_tis_update_durations,
809952 	.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
810953 	.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
811954 	.req_canceled = tpm_tis_req_canceled,
812
-	.request_locality = request_locality,
813
-	.relinquish_locality = release_locality,
955
+	.request_locality = tpm_tis_request_locality,
956
+	.relinquish_locality = tpm_tis_relinquish_locality,
814957 	.clk_enable = tpm_tis_clkrun_enable,
815958 };
816959 
....@@ -841,8 +984,25 @@
841984 	chip->timeout_b = msecs_to_jiffies(TIS_TIMEOUT_B_MAX);
842985 	chip->timeout_c = msecs_to_jiffies(TIS_TIMEOUT_C_MAX);
843986 	chip->timeout_d = msecs_to_jiffies(TIS_TIMEOUT_D_MAX);
987
+	priv->timeout_min = TPM_TIMEOUT_USECS_MIN;
988
+	priv->timeout_max = TPM_TIMEOUT_USECS_MAX;
844989 	priv->phy_ops = phy_ops;
990
+	priv->locality_count = 0;
991
+	mutex_init(&priv->locality_count_mutex);
992
+
845993 	dev_set_drvdata(&chip->dev, priv);
994
+
995
+	rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
996
+	if (rc < 0)
997
+		return rc;
998
+
999
+	priv->manufacturer_id = vendor;
1000
+
1001
+	if (priv->manufacturer_id == TPM_VID_ATML &&
1002
+		!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
1003
+		priv->timeout_min = TIS_TIMEOUT_MIN_ATML;
1004
+		priv->timeout_max = TIS_TIMEOUT_MAX_ATML;
1005
+	}
8461006 
8471007 	if (is_bsw()) {
8481008 		priv->ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR,
....@@ -875,24 +1035,22 @@
8751035 		   TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
8761036 	intmask &= ~TPM_GLOBAL_INT_ENABLE;
8771037 
878
-	rc = request_locality(chip, 0);
1038
+	rc = tpm_tis_request_locality(chip, 0);
8791039 	if (rc < 0) {
8801040 		rc = -ENODEV;
8811041 		goto out_err;
8821042 	}
8831043 
8841044 	tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
885
-	release_locality(chip, 0);
1045
+	tpm_tis_relinquish_locality(chip, 0);
8861046 
887
-	rc = tpm2_probe(chip);
1047
+	rc = tpm_chip_start(chip);
8881048 	if (rc)
8891049 		goto out_err;
890
-
891
-	rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
892
-	if (rc < 0)
1050
+	rc = tpm2_probe(chip);
1051
+	tpm_chip_stop(chip);
1052
+	if (rc)
8931053 		goto out_err;
894
-
895
-	priv->manufacturer_id = vendor;
8961054 
8971055 	rc = tpm_tis_read8(priv, TPM_RID(0), &rid);
8981056 	if (rc < 0)
....@@ -938,27 +1096,41 @@
9381096 	init_waitqueue_head(&priv->read_queue);
9391097 	init_waitqueue_head(&priv->int_queue);
9401098 	if (irq != -1) {
941
-		/* Before doing irq testing issue a command to the TPM in polling mode
1099
+		/*
1100
+		 * Before doing irq testing issue a command to the TPM in polling mode
9421101 		 * to make sure it works. May as well use that command to set the
9431102 		 * proper timeouts for the driver.
9441103 		 */
945
-		if (tpm_get_timeouts(chip)) {
1104
+
1105
+		rc = tpm_tis_request_locality(chip, 0);
1106
+		if (rc < 0)
1107
+			goto out_err;
1108
+
1109
+		rc = tpm_get_timeouts(chip);
1110
+
1111
+		tpm_tis_relinquish_locality(chip, 0);
1112
+
1113
+		if (rc) {
9461114 			dev_err(dev, "Could not get TPM timeouts and durations\n");
9471115 			rc = -ENODEV;
9481116 			goto out_err;
9491117 		}
9501118 
951
-		if (irq) {
1119
+		if (irq)
9521120 			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
9531121 						 irq);
954
-			if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
955
-				dev_err(&chip->dev, FW_BUG
1122
+		else
1123
+			tpm_tis_probe_irq(chip, intmask);
1124
+
1125
+		if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
1126
+			dev_err(&chip->dev, FW_BUG
9561127 					"TPM interrupt not working, polling instead\n");
9571128 
958
-				disable_interrupts(chip);
959
-			}
960
-		} else {
961
-			tpm_tis_probe_irq(chip, intmask);
1129
+			rc = tpm_tis_request_locality(chip, 0);
1130
+			if (rc < 0)
1131
+				goto out_err;
1132
+			disable_interrupts(chip);
1133
+			tpm_tis_relinquish_locality(chip, 0);
9621134 		}
9631135 	}
9641136 
....@@ -1019,20 +1191,27 @@
10191191 	struct tpm_chip *chip = dev_get_drvdata(dev);
10201192 	int ret;
10211193 
1194
+	ret = tpm_tis_request_locality(chip, 0);
1195
+	if (ret < 0)
1196
+		return ret;
1197
+
10221198 	if (chip->flags & TPM_CHIP_FLAG_IRQ)
10231199 		tpm_tis_reenable_interrupts(chip);
10241200 
10251201 	ret = tpm_pm_resume(dev);
10261202 	if (ret)
1027
-		return ret;
1203
+		goto out;
10281204 
1029
-	/* TPM 1.2 requires self-test on resume. This function actually returns
1205
+	/*
1206
+	 * TPM 1.2 requires self-test on resume. This function actually returns
10301207 	 * an error code but for unknown reason it isn't handled.
10311208 	 */
10321209 	if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
1033
-		tpm_do_selftest(chip);
1210
+		tpm1_do_selftest(chip);
1211
+out:
1212
+	tpm_tis_relinquish_locality(chip, 0);
10341213 
1035
-	return 0;
1214
+	return ret;
10361215 }
10371216 EXPORT_SYMBOL_GPL(tpm_tis_resume);
10381217 #endif