summaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/prom.c
blob: 2c64ed627475d065f6607066b9350d2544c486ff (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
/*
 * Procedures for interfacing to the Open Firmware PROM on
 * Power Macintosh computers.
 *
 * In particular, we are interested in the device tree
 * and in using some of its services (exit, write to stdout).
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996 Paul Mackerras.
 */
#include <stdarg.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/bitops.h>

#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/btext.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>


struct pci_address {
	unsigned a_hi;
	unsigned a_mid;
	unsigned a_lo;
};

struct pci_reg_property {
	struct pci_address addr;
	unsigned size_hi;
	unsigned size_lo;
};

struct isa_reg_property {
	unsigned space;
	unsigned address;
	unsigned size;
};

typedef unsigned long interpret_func(struct device_node *, unsigned long,
				     int, int);
static interpret_func interpret_pci_props;
static interpret_func interpret_dbdma_props;
static interpret_func interpret_isa_props;
static interpret_func interpret_macio_props;
static interpret_func interpret_root_props;

extern char *klimit;

/* Set for a newworld or CHRP machine */
int use_of_interrupt_tree;
struct device_node *dflt_interrupt_controller;
int num_interrupt_controllers;

int pmac_newworld;

extern unsigned int rtas_entry;  /* physical pointer */

extern struct device_node *allnodes;

static unsigned long finish_node(struct device_node *, unsigned long,
				 interpret_func *, int, int);
static unsigned long finish_node_interrupts(struct device_node *, unsigned long);
static struct device_node *find_phandle(phandle);

extern void enter_rtas(void *);
void phys_call_rtas(int, int, int, ...);

extern char cmd_line[512];	/* XXX */
extern boot_infos_t *boot_infos;
unsigned long dev_tree_size;

void __openfirmware
phys_call_rtas(int service, int nargs, int nret, ...)
{
	va_list list;
	union {
		unsigned long words[16];
		double align;
	} u;
	void (*rtas)(void *, unsigned long);
	int i;

	u.words[0] = service;
	u.words[1] = nargs;
	u.words[2] = nret;
	va_start(list, nret);
	for (i = 0; i < nargs; ++i)
		u.words[i+3] = va_arg(list, unsigned long);
	va_end(list);

	rtas = (void (*)(void *, unsigned long)) rtas_entry;
	rtas(&u, rtas_data);
}

/*
 * finish_device_tree is called once things are running normally
 * (i.e. with text and data mapped to the address they were linked at).
 * It traverses the device tree and fills in the name, type,
 * {n_}addrs and {n_}intrs fields of each node.
 */
void __init
finish_device_tree(void)
{
	unsigned long mem = (unsigned long) klimit;
	struct device_node *np;

	/* All newworld pmac machines and CHRPs now use the interrupt tree */
	for (np = allnodes; np != NULL; np = np->allnext) {
		if (get_property(np, "interrupt-parent", NULL)) {
			use_of_interrupt_tree = 1;
			break;
		}
	}
	if (_machine == _MACH_Pmac && use_of_interrupt_tree)
		pmac_newworld = 1;

#ifdef CONFIG_BOOTX_TEXT
	if (boot_infos && pmac_newworld) {
		prom_print("WARNING ! BootX/miBoot booting is not supported on this machine\n");
		prom_print("          You should use an Open Firmware bootloader\n");
	}
#endif /* CONFIG_BOOTX_TEXT */

	if (use_of_interrupt_tree) {
		/*
		 * We want to find out here how many interrupt-controller
		 * nodes there are, and if we are booted from BootX,
		 * we need a pointer to the first (and hopefully only)
		 * such node.  But we can't use find_devices here since
		 * np->name has not been set yet.  -- paulus
		 */
		int n = 0;
		char *name, *ic;
		int iclen;

		for (np = allnodes; np != NULL; np = np->allnext) {
			ic = get_property(np, "interrupt-controller", &iclen);
			name = get_property(np, "name", NULL);
			/* checking iclen makes sure we don't get a false
			   match on /chosen.interrupt_controller */
			if ((name != NULL
			     && strcmp(name, "interrupt-controller") == 0)
			    || (ic != NULL && iclen == 0 && strcmp(name, "AppleKiwi"))) {
				if (n == 0)
					dflt_interrupt_controller = np;
				++n;
			}
		}
		num_interrupt_controllers = n;
	}

	mem = finish_node(allnodes, mem, NULL, 1, 1);
	dev_tree_size = mem - (unsigned long) allnodes;
	klimit = (char *) mem;
}

static unsigned long __init
finish_node(struct device_node *np, unsigned long mem_start,
	    interpret_func *ifunc, int naddrc, int nsizec)
{
	struct device_node *child;
	int *ip;

	np->name = get_property(np, "name", NULL);
	np->type = get_property(np, "device_type", NULL);

	if (!np->name)
		np->name = "<NULL>";
	if (!np->type)
		np->type = "<NULL>";

	/* get the device addresses and interrupts */
	if (ifunc != NULL)
		mem_start = ifunc(np, mem_start, naddrc, nsizec);

	if (use_of_interrupt_tree)
		mem_start = finish_node_interrupts(np, mem_start);

	/* Look for #address-cells and #size-cells properties. */
	ip = (int *) get_property(np, "#address-cells", NULL);
	if (ip != NULL)
		naddrc = *ip;
	ip = (int *) get_property(np, "#size-cells", NULL);
	if (ip != NULL)
		nsizec = *ip;

	if (np->parent == NULL)
		ifunc = interpret_root_props;
	else if (np->type == 0)
		ifunc = NULL;
	else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci"))
		ifunc = interpret_pci_props;
	else if (!strcmp(np->type, "dbdma"))
		ifunc = interpret_dbdma_props;
	else if (!strcmp(np->type, "mac-io")
		 || ifunc == interpret_macio_props)
		ifunc = interpret_macio_props;
	else if (!strcmp(np->type, "isa"))
		ifunc = interpret_isa_props;
	else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3"))
		ifunc = interpret_root_props;
	else if (!((ifunc == interpret_dbdma_props
		    || ifunc == interpret_macio_props)
		   && (!strcmp(np->type, "escc")
		       || !strcmp(np->type, "media-bay"))))
		ifunc = NULL;

	/* if we were booted from BootX, convert the full name */
	if (boot_infos
	    && strncmp(np->full_name, "Devices:device-tree", 19) == 0) {
		if (np->full_name[19] == 0) {
			strcpy(np->full_name, "/");
		} else if (np->full_name[19] == ':') {
			char *p = np->full_name + 19;
			np->full_name = p;
			for (; *p; ++p)
				if (*p == ':')
					*p = '/';
		}
	}

	for (child = np->child; child != NULL; child = child->sibling)
		mem_start = finish_node(child, mem_start, ifunc,
					naddrc, nsizec);

	return mem_start;
}

/*
 * Find the interrupt parent of a node.
 */
static struct device_node * __init
intr_parent(struct device_node *p)
{
	phandle *parp;

	parp = (phandle *) get_property(p, "interrupt-parent", NULL);
	if (parp == NULL)
		return p->parent;
	p = find_phandle(*parp);
	if (p != NULL)
		return p;
	/*
	 * On a powermac booted with BootX, we don't get to know the
	 * phandles for any nodes, so find_phandle will return NULL.
	 * Fortunately these machines only have one interrupt controller
	 * so there isn't in fact any ambiguity.  -- paulus
	 */
	if (num_interrupt_controllers == 1)
		p = dflt_interrupt_controller;
	return p;
}

/*
 * Find out the size of each entry of the interrupts property
 * for a node.
 */
static int __init
prom_n_intr_cells(struct device_node *np)
{
	struct device_node *p;
	unsigned int *icp;

	for (p = np; (p = intr_parent(p)) != NULL; ) {
		icp = (unsigned int *)
			get_property(p, "#interrupt-cells", NULL);
		if (icp != NULL)
			return *icp;
		if (get_property(p, "interrupt-controller", NULL) != NULL
		    || get_property(p, "interrupt-map", NULL) != NULL) {
			printk("oops, node %s doesn't have #interrupt-cells\n",
			       p->full_name);
			return 1;
		}
	}
	printk("prom_n_intr_cells failed for %s\n", np->full_name);
	return 1;
}

/*
 * Map an interrupt from a device up to the platform interrupt
 * descriptor.
 */
static int __init
map_interrupt(unsigned int **irq, struct device_node **ictrler,
	      struct device_node *np, unsigned int *ints, int nintrc)
{
	struct device_node *p, *ipar;
	unsigned int *imap, *imask, *ip;
	int i, imaplen, match;
	int newintrc = 1, newaddrc = 1;
	unsigned int *reg;
	int naddrc;

	reg = (unsigned int *) get_property(np, "reg", NULL);
	naddrc = prom_n_addr_cells(np);
	p = intr_parent(np);
	while (p != NULL) {
		if (get_property(p, "interrupt-controller", NULL) != NULL)
			/* this node is an interrupt controller, stop here */
			break;
		imap = (unsigned int *)
			get_property(p, "interrupt-map", &imaplen);
		if (imap == NULL) {
			p = intr_parent(p);
			continue;
		}
		imask = (unsigned int *)
			get_property(p, "interrupt-map-mask", NULL);
		if (imask == NULL) {
			printk("oops, %s has interrupt-map but no mask\n",
			       p->full_name);
			return 0;
		}
		imaplen /= sizeof(unsigned int);
		match = 0;
		ipar = NULL;
		while (imaplen > 0 && !match) {
			/* check the child-interrupt field */
			match = 1;
			for (i = 0; i < naddrc && match; ++i)
				match = ((reg[i] ^ imap[i]) & imask[i]) == 0;
			for (; i < naddrc + nintrc && match; ++i)
				match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0;
			imap += naddrc + nintrc;
			imaplen -= naddrc + nintrc;
			/* grab the interrupt parent */
			ipar = find_phandle((phandle) *imap++);
			--imaplen;
			if (ipar == NULL && num_interrupt_controllers == 1)
				/* cope with BootX not giving us phandles */
				ipar = dflt_interrupt_controller;
			if (ipar == NULL) {
				printk("oops, no int parent %x in map of %s\n",
				       imap[-1], p->full_name);
				return 0;
			}
			/* find the parent's # addr and intr cells */
			ip = (unsigned int *)
				get_property(ipar, "#interrupt-cells", NULL);
			if (ip == NULL) {
				printk("oops, no #interrupt-cells on %s\n",
				       ipar->full_name);
				return 0;
			}
			newintrc = *ip;
			ip = (unsigned int *)
				get_property(ipar, "#address-cells", NULL);
			newaddrc = (ip == NULL)? 0: *ip;
			imap += newaddrc + newintrc;
			imaplen -= newaddrc + newintrc;
		}
		if (imaplen < 0) {
			printk("oops, error decoding int-map on %s, len=%d\n",
			       p->full_name, imaplen);
			return 0;
		}
		if (!match) {
			printk("oops, no match in %s int-map for %s\n",
			       p->full_name, np->full_name);
			return 0;
		}
		p = ipar;
		naddrc = newaddrc;
		nintrc = newintrc;
		ints = imap - nintrc;
		reg = ints - naddrc;
	}
	if (p == NULL)
		printk("hmmm, int tree for %s doesn't have ctrler\n",
		       np->full_name);
	*irq = ints;
	*ictrler = p;
	return nintrc;
}

/*
 * New version of finish_node_interrupts.
 */
static unsigned long __init
finish_node_interrupts(struct device_node *np, unsigned long mem_start)
{
	unsigned int *ints;
	int intlen, intrcells;
	int i, j, n, offset;
	unsigned int *irq;
	struct device_node *ic;

	ints = (unsigned int *) get_property(np, "interrupts", &intlen);
	if (ints == NULL)
		return mem_start;
	intrcells = prom_n_intr_cells(np);
	intlen /= intrcells * sizeof(unsigned int);
	np->n_intrs = intlen;
	np->intrs = (struct interrupt_info *) mem_start;
	mem_start += intlen * sizeof(struct interrupt_info);

	for (i = 0; i < intlen; ++i) {
		np->intrs[i].line = 0;
		np->intrs[i].sense = 1;
		n = map_interrupt(&irq, &ic, np, ints, intrcells);
		if (n <= 0)
			continue;
		offset = 0;
		/*
		 * On a CHRP we have an 8259 which is subordinate to
		 * the openpic in the interrupt tree, but we want the
		 * openpic's interrupt numbers offsetted, not the 8259's.
		 * So we apply the offset if the controller is at the
		 * root of the interrupt tree, i.e. has no interrupt-parent.
		 * This doesn't cope with the general case of multiple
		 * cascaded interrupt controllers, but then neither will
		 * irq.c at the moment either.  -- paulus
		 * The G5 triggers that code, I add a machine test. On
		 * those machines, we want to offset interrupts from the
		 * second openpic by 128 -- BenH
		 */
		if (_machine != _MACH_Pmac && num_interrupt_controllers > 1
		    && ic != NULL
		    && get_property(ic, "interrupt-parent", NULL) == NULL)
			offset = 16;
		else if (_machine == _MACH_Pmac && num_interrupt_controllers > 1
			 && ic != NULL && ic->parent != NULL) {
			char *name = get_property(ic->parent, "name", NULL);
			if (name && !strcmp(name, "u3"))
				offset = 128;
		}

		np->intrs[i].line = irq[0] + offset;
		if (n > 1)
			np->intrs[i].sense = irq[1];
		if (n > 2) {
			printk("hmmm, got %d intr cells for %s:", n,
			       np->full_name);
			for (j = 0; j < n; ++j)
				printk(" %d", irq[j]);
			printk("\n");
		}
		ints += intrcells;
	}

	return mem_start;
}

/*
 * When BootX makes a copy of the device tree from the MacOS
 * Name Registry, it is in the format we use but all of the pointers
 * are offsets from the start of the tree.
 * This procedure updates the pointers.
 */
void __init
relocate_nodes(void)
{
	unsigned long base;
	struct device_node *np;
	struct property *pp;

#define ADDBASE(x)	(x = (typeof (x))((x)? ((unsigned long)(x) + base): 0))

	base = (unsigned long) boot_infos + boot_infos->deviceTreeOffset;
	allnodes = (struct device_node *)(base + 4);
	for (np = allnodes; np != 0; np = np->allnext) {
		ADDBASE(np->full_name);
		ADDBASE(np->properties);
		ADDBASE(np->parent);
		ADDBASE(np->child);
		ADDBASE(np->sibling);
		ADDBASE(np->allnext);
		for (pp = np->properties; pp != 0; pp = pp->next) {
			ADDBASE(pp->name);
			ADDBASE(pp->value);
			ADDBASE(pp->next);
		}
	}
}

int
prom_n_addr_cells(struct device_node* np)
{
	int* ip;
	do {
		if (np->parent)
			np = np->parent;
		ip = (int *) get_property(np, "#address-cells", NULL);
		if (ip != NULL)
			return *ip;
	} while (np->parent);
	/* No #address-cells property for the root node, default to 1 */
	return 1;
}

int
prom_n_size_cells(struct device_node* np)
{
	int* ip;
	do {
		if (np->parent)
			np = np->parent;
		ip = (int *) get_property(np, "#size-cells", NULL);
		if (ip != NULL)
			return *ip;
	} while (np->parent);
	/* No #size-cells property for the root node, default to 1 */
	return 1;
}

static unsigned long __init
map_addr(struct device_node *np, unsigned long space, unsigned long addr)
{
	int na;
	unsigned int *ranges;
	int rlen = 0;
	unsigned int type;

	type = (space >> 24) & 3;
	if (type == 0)
		return addr;

	while ((np = np->parent) != NULL) {
		if (strcmp(np->type, "pci") != 0)
			continue;
		/* PCI bridge: map the address through the ranges property */
		na = prom_n_addr_cells(np);
		ranges = (unsigned int *) get_property(np, "ranges", &rlen);
		while ((rlen -= (na + 5) * sizeof(unsigned int)) >= 0) {
			if (((ranges[0] >> 24) & 3) == type
			    && ranges[2] <= addr
			    && addr - ranges[2] < ranges[na+4]) {
				/* ok, this matches, translate it */
				addr += ranges[na+2] - ranges[2];
				break;
			}
			ranges += na + 5;
		}
	}
	return addr;
}

static unsigned long __init
interpret_pci_props(struct device_node *np, unsigned long mem_start,
		    int naddrc, int nsizec)
{
	struct address_range *adr;
	struct pci_reg_property *pci_addrs;
	int i, l, *ip;

	pci_addrs = (struct pci_reg_property *)
		get_property(np, "assigned-addresses", &l);
	if (pci_addrs != 0 && l >= sizeof(struct pci_reg_property)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct pci_reg_property)) >= 0) {
			adr[i].space = pci_addrs[i].addr.a_hi;
			adr[i].address = map_addr(np, pci_addrs[i].addr.a_hi,
						  pci_addrs[i].addr.a_lo);
			adr[i].size = pci_addrs[i].size_lo;
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	if (use_of_interrupt_tree)
		return mem_start;

	ip = (int *) get_property(np, "AAPL,interrupts", &l);
	if (ip == 0 && np->parent)
		ip = (int *) get_property(np->parent, "AAPL,interrupts", &l);
	if (ip == 0)
		ip = (int *) get_property(np, "interrupts", &l);
	if (ip != 0) {
		np->intrs = (struct interrupt_info *) mem_start;
		np->n_intrs = l / sizeof(int);
		mem_start += np->n_intrs * sizeof(struct interrupt_info);
		for (i = 0; i < np->n_intrs; ++i) {
			np->intrs[i].line = *ip++;
			np->intrs[i].sense = 1;
		}
	}

	return mem_start;
}

static unsigned long __init
interpret_dbdma_props(struct device_node *np, unsigned long mem_start,
		      int naddrc, int nsizec)
{
	struct reg_property *rp;
	struct address_range *adr;
	unsigned long base_address;
	int i, l, *ip;
	struct device_node *db;

	base_address = 0;
	for (db = np->parent; db != NULL; db = db->parent) {
		if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) {
			base_address = db->addrs[0].address;
			break;
		}
	}

	rp = (struct reg_property *) get_property(np, "reg", &l);
	if (rp != 0 && l >= sizeof(struct reg_property)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct reg_property)) >= 0) {
			adr[i].space = 2;
			adr[i].address = rp[i].address + base_address;
			adr[i].size = rp[i].size;
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	if (use_of_interrupt_tree)
		return mem_start;

	ip = (int *) get_property(np, "AAPL,interrupts", &l);
	if (ip == 0)
		ip = (int *) get_property(np, "interrupts", &l);
	if (ip != 0) {
		np->intrs = (struct interrupt_info *) mem_start;
		np->n_intrs = l / sizeof(int);
		mem_start += np->n_intrs * sizeof(struct interrupt_info);
		for (i = 0; i < np->n_intrs; ++i) {
			np->intrs[i].line = *ip++;
			np->intrs[i].sense = 1;
		}
	}

	return mem_start;
}

static unsigned long __init
interpret_macio_props(struct device_node *np, unsigned long mem_start,
		      int naddrc, int nsizec)
{
	struct reg_property *rp;
	struct address_range *adr;
	unsigned long base_address;
	int i, l, *ip;
	struct device_node *db;

	base_address = 0;
	for (db = np->parent; db != NULL; db = db->parent) {
		if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) {
			base_address = db->addrs[0].address;
			break;
		}
	}

	rp = (struct reg_property *) get_property(np, "reg", &l);
	if (rp != 0 && l >= sizeof(struct reg_property)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct reg_property)) >= 0) {
			adr[i].space = 2;
			adr[i].address = rp[i].address + base_address;
			adr[i].size = rp[i].size;
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	if (use_of_interrupt_tree)
		return mem_start;

	ip = (int *) get_property(np, "interrupts", &l);
	if (ip == 0)
		ip = (int *) get_property(np, "AAPL,interrupts", &l);
	if (ip != 0) {
		np->intrs = (struct interrupt_info *) mem_start;
		np->n_intrs = l / sizeof(int);
		for (i = 0; i < np->n_intrs; ++i) {
			np->intrs[i].line = *ip++;
			np->intrs[i].sense = 1;
		}
		mem_start += np->n_intrs * sizeof(struct interrupt_info);
	}

	return mem_start;
}

static unsigned long __init
interpret_isa_props(struct device_node *np, unsigned long mem_start,
		    int naddrc, int nsizec)
{
	struct isa_reg_property *rp;
	struct address_range *adr;
	int i, l, *ip;

	rp = (struct isa_reg_property *) get_property(np, "reg", &l);
	if (rp != 0 && l >= sizeof(struct isa_reg_property)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct reg_property)) >= 0) {
			adr[i].space = rp[i].space;
			adr[i].address = rp[i].address
				+ (adr[i].space? 0: _ISA_MEM_BASE);
			adr[i].size = rp[i].size;
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	if (use_of_interrupt_tree)
		return mem_start;

	ip = (int *) get_property(np, "interrupts", &l);
	if (ip != 0) {
		np->intrs = (struct interrupt_info *) mem_start;
		np->n_intrs = l / (2 * sizeof(int));
		mem_start += np->n_intrs * sizeof(struct interrupt_info);
		for (i = 0; i < np->n_intrs; ++i) {
			np->intrs[i].line = *ip++;
			np->intrs[i].sense = *ip++;
		}
	}

	return mem_start;
}

static unsigned long __init
interpret_root_props(struct device_node *np, unsigned long mem_start,
		     int naddrc, int nsizec)
{
	struct address_range *adr;
	int i, l, *ip;
	unsigned int *rp;
	int rpsize = (naddrc + nsizec) * sizeof(unsigned int);

	rp = (unsigned int *) get_property(np, "reg", &l);
	if (rp != 0 && l >= rpsize) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= rpsize) >= 0) {
			adr[i].space = (naddrc >= 2? rp[naddrc-2]: 2);
			adr[i].address = rp[naddrc - 1];
			adr[i].size = rp[naddrc + nsizec - 1];
			++i;
			rp += naddrc + nsizec;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	if (use_of_interrupt_tree)
		return mem_start;

	ip = (int *) get_property(np, "AAPL,interrupts", &l);
	if (ip == 0)
		ip = (int *) get_property(np, "interrupts", &l);
	if (ip != 0) {
		np->intrs = (struct interrupt_info *) mem_start;
		np->n_intrs = l / sizeof(int);
		mem_start += np->n_intrs * sizeof(struct interrupt_info);
		for (i = 0; i < np->n_intrs; ++i) {
			np->intrs[i].line = *ip++;
			np->intrs[i].sense = 1;
		}
	}

	return mem_start;
}

/*
 * Work out the sense (active-low level / active-high edge)
 * of each interrupt from the device tree.
 */
void __init
prom_get_irq_senses(unsigned char *senses, int off, int max)
{
	struct device_node *np;
	int i, j;

	/* default to level-triggered */
	memset(senses, 1, max - off);
	if (!use_of_interrupt_tree)
		return;

	for (np = allnodes; np != 0; np = np->allnext) {
		for (j = 0; j < np->n_intrs; j++) {
			i = np->intrs[j].line;
			if (i >= off && i < max) {
				if (np->intrs[j].sense == 1)
					senses[i-off] = (IRQ_SENSE_LEVEL
						| IRQ_POLARITY_NEGATIVE);
				else
					senses[i-off] = (IRQ_SENSE_EDGE
						| IRQ_POLARITY_POSITIVE);
			}
		}
	}
}

/*
 * Construct and return a list of the device_nodes with a given name.
 */
struct device_node *
find_devices(const char *name)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		if (np->name != 0 && strcasecmp(np->name, name) == 0) {
			*prevp = np;
			prevp = &np->next;
		}
	}
	*prevp = NULL;
	return head;
}

/*
 * Construct and return a list of the device_nodes with a given type.
 */
struct device_node *
find_type_devices(const char *type)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		if (np->type != 0 && strcasecmp(np->type, type) == 0) {
			*prevp = np;
			prevp = &np->next;
		}
	}
	*prevp = NULL;
	return head;
}

/*
 * Returns all nodes linked together
 */
struct device_node * __openfirmware
find_all_nodes(void)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		*prevp = np;
		prevp = &np->next;
	}
	*prevp = NULL;
	return head;
}

/* Checks if the given "compat" string matches one of the strings in
 * the device's "compatible" property
 */
int
device_is_compatible(struct device_node *device, const char *compat)
{
	const char* cp;
	int cplen, l;

	cp = (char *) get_property(device, "compatible", &cplen);
	if (cp == NULL)
		return 0;
	while (cplen > 0) {
		if (strncasecmp(cp, compat, strlen(compat)) == 0)
			return 1;
		l = strlen(cp) + 1;
		cp += l;
		cplen -= l;
	}

	return 0;
}


/*
 * Indicates whether the root node has a given value in its
 * compatible property.
 */
int
machine_is_compatible(const char *compat)
{
	struct device_node *root;

	root = find_path_device("/");
	if (root == 0)
		return 0;
	return device_is_compatible(root, compat);
}

/*
 * Construct and return a list of the device_nodes with a given type
 * and compatible property.
 */
struct device_node *
find_compatible_devices(const char *type, const char *compat)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		if (type != NULL
		    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
			continue;
		if (device_is_compatible(np, compat)) {
			*prevp = np;
			prevp = &np->next;
		}
	}
	*prevp = NULL;
	return head;
}

/*
 * Find the device_node with a given full_name.
 */
struct device_node *
find_path_device(const char *path)
{
	struct device_node *np;

	for (np = allnodes; np != 0; np = np->allnext)
		if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
			return np;
	return NULL;
}

/*******
 *
 * New implementation of the OF "find" APIs, return a refcounted
 * object, call of_node_put() when done. Currently, still lacks
 * locking as old implementation, this is beeing done for ppc64.
 *
 * Note that property management will need some locking as well,
 * this isn't dealt with yet
 *
 *******/

/**
 *	of_find_node_by_name - Find a node by it's "name" property
 *	@from:	The node to start searching from or NULL, the node
 *		you pass will not be searched, only the next one
 *		will; typically, you pass what the previous call
 *		returned. of_node_put() will be called on it
 *	@name:	The name string to match against
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_node_by_name(struct device_node *from,
	const char *name)
{
	struct device_node *np = from ? from->allnext : allnodes;

	for (; np != 0; np = np->allnext)
		if (np->name != 0 && strcasecmp(np->name, name) == 0)
			break;
	if (from)
		of_node_put(from);
	return of_node_get(np);
}

/**
 *	of_find_node_by_type - Find a node by it's "device_type" property
 *	@from:	The node to start searching from or NULL, the node
 *		you pass will not be searched, only the next one
 *		will; typically, you pass what the previous call
 *		returned. of_node_put() will be called on it
 *	@name:	The type string to match against
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_node_by_type(struct device_node *from,
	const char *type)
{
	struct device_node *np = from ? from->allnext : allnodes;

	for (; np != 0; np = np->allnext)
		if (np->type != 0 && strcasecmp(np->type, type) == 0)
			break;
	if (from)
		of_node_put(from);
	return of_node_get(np);
}

/**
 *	of_find_compatible_node - Find a node based on type and one of the
 *                                tokens in it's "compatible" property
 *	@from:		The node to start searching from or NULL, the node
 *			you pass will not be searched, only the next one
 *			will; typically, you pass what the previous call
 *			returned. of_node_put() will be called on it
 *	@type:		The type string to match "device_type" or NULL to ignore
 *	@compatible:	The string to match to one of the tokens in the device
 *			"compatible" list.
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_compatible_node(struct device_node *from,
	const char *type, const char *compatible)
{
	struct device_node *np = from ? from->allnext : allnodes;

	for (; np != 0; np = np->allnext) {
		if (type != NULL
		    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
			continue;
		if (device_is_compatible(np, compatible))
			break;
	}
	if (from)
		of_node_put(from);
	return of_node_get(np);
}

/**
 *	of_find_node_by_path - Find a node matching a full OF path
 *	@path:	The full path to match
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_node_by_path(const char *path)
{
	struct device_node *np = allnodes;

	for (; np != 0; np = np->allnext)
		if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
			break;
	return of_node_get(np);
}

/**
 *	of_find_all_nodes - Get next node in global list
 *	@prev:	Previous node or NULL to start iteration
 *		of_node_put() will be called on it
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_all_nodes(struct device_node *prev)
{
	return of_node_get(prev ? prev->allnext : allnodes);
}

/**
 *	of_get_parent - Get a node's parent if any
 *	@node:	Node to get parent
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_get_parent(const struct device_node *node)
{
	return node ? of_node_get(node->parent) : NULL;
}

/**
 *	of_get_next_child - Iterate a node childs
 *	@node:	parent node
 *	@prev:	previous child of the parent node, or NULL to get first
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_get_next_child(const struct device_node *node,
				      struct device_node *prev)
{
	struct device_node *next = prev ? prev->sibling : node->child;

	for (; next != 0; next = next->sibling)
		if (of_node_get(next))
			break;
	if (prev)
		of_node_put(prev);
	return next;
}

/**
 *	of_node_get - Increment refcount of a node
 *	@node:	Node to inc refcount, NULL is supported to
 *		simplify writing of callers
 *
 *	Returns the node itself or NULL if gone. Current implementation
 *	does nothing as we don't yet do dynamic node allocation on ppc32
 */
struct device_node *of_node_get(struct device_node *node)
{
	return node;
}

/**
 *	of_node_put - Decrement refcount of a node
 *	@node:	Node to dec refcount, NULL is supported to
 *		simplify writing of callers
 *
 *	Current implementation does nothing as we don't yet do dynamic node
 *	allocation on ppc32
 */
void  of_node_put(struct device_node *node)
{
}

/*
 * Find the device_node with a given phandle.
 */
static struct device_node * __init
find_phandle(phandle ph)
{
	struct device_node *np;

	for (np = allnodes; np != 0; np = np->allnext)
		if (np->node == ph)
			return np;
	return NULL;
}

/*
 * Find a property with a given name for a given node
 * and return the value.
 */
unsigned char *
get_property(struct device_node *np, const char *name, int *lenp)
{
	struct property *pp;

	for (pp = np->properties; pp != 0; pp = pp->next)
		if (pp->name != NULL && strcmp(pp->name, name) == 0) {
			if (lenp != 0)
				*lenp = pp->length;
			return pp->value;
		}
	return NULL;
}

/*
 * Add a property to a node
 */
void __openfirmware
prom_add_property(struct device_node* np, struct property* prop)
{
	struct property **next = &np->properties;

	prop->next = NULL;
	while (*next)
		next = &(*next)->next;
	*next = prop;
}

/* I quickly hacked that one, check against spec ! */
static inline unsigned long __openfirmware
bus_space_to_resource_flags(unsigned int bus_space)
{
	u8 space = (bus_space >> 24) & 0xf;
	if (space == 0)
		space = 0x02;
	if (space == 0x02)
		return IORESOURCE_MEM;
	else if (space == 0x01)
		return IORESOURCE_IO;
	else {
		printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %x\n",
		    	bus_space);
		return 0;
	}
}

static struct resource* __openfirmware
find_parent_pci_resource(struct pci_dev* pdev, struct address_range *range)
{
	unsigned long mask;
	int i;

	/* Check this one */
	mask = bus_space_to_resource_flags(range->space);
	for (i=0; i<DEVICE_COUNT_RESOURCE; i++) {
		if ((pdev->resource[i].flags & mask) == mask &&
			pdev->resource[i].start <= range->address &&
			pdev->resource[i].end > range->address) {
				if ((range->address + range->size - 1) > pdev->resource[i].end) {
					/* Add better message */
					printk(KERN_WARNING "PCI/OF resource overlap !\n");
					return NULL;
				}
				break;
			}
	}
	if (i == DEVICE_COUNT_RESOURCE)
		return NULL;
	return &pdev->resource[i];
}

/*
 * Request an OF device resource. Currently handles child of PCI devices,
 * or other nodes attached to the root node. Ultimately, put some
 * link to resources in the OF node.
 */
struct resource* __openfirmware
request_OF_resource(struct device_node* node, int index, const char* name_postfix)
{
	struct pci_dev* pcidev;
	u8 pci_bus, pci_devfn;
	unsigned long iomask;
	struct device_node* nd;
	struct resource* parent;
	struct resource *res = NULL;
	int nlen, plen;

	if (index >= node->n_addrs)
		goto fail;

	/* Sanity check on bus space */
	iomask = bus_space_to_resource_flags(node->addrs[index].space);
	if (iomask & IORESOURCE_MEM)
		parent = &iomem_resource;
	else if (iomask & IORESOURCE_IO)
		parent = &ioport_resource;
	else
		goto fail;

	/* Find a PCI parent if any */
	nd = node;
	pcidev = NULL;
	while(nd) {
		if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
			pcidev = pci_find_slot(pci_bus, pci_devfn);
		if (pcidev) break;
		nd = nd->parent;
	}
	if (pcidev)
		parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
	if (!parent) {
		printk(KERN_WARNING "request_OF_resource(%s), parent not found\n",
			node->name);
		goto fail;
	}

	res = __request_region(parent, node->addrs[index].address, node->addrs[index].size, NULL);
	if (!res)
		goto fail;
	nlen = strlen(node->name);
	plen = name_postfix ? strlen(name_postfix) : 0;
	res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL);
	if (res->name) {
		strcpy((char *)res->name, node->name);
		if (plen)
			strcpy((char *)res->name+nlen, name_postfix);
	}
	return res;
fail:
	return NULL;
}

int __openfirmware
release_OF_resource(struct device_node* node, int index)
{
	struct pci_dev* pcidev;
	u8 pci_bus, pci_devfn;
	unsigned long iomask, start, end;
	struct device_node* nd;
	struct resource* parent;
	struct resource *res = NULL;

	if (index >= node->n_addrs)
		return -EINVAL;

	/* Sanity check on bus space */
	iomask = bus_space_to_resource_flags(node->addrs[index].space);
	if (iomask & IORESOURCE_MEM)
		parent = &iomem_resource;
	else if (iomask & IORESOURCE_IO)
		parent = &ioport_resource;
	else
		return -EINVAL;

	/* Find a PCI parent if any */
	nd = node;
	pcidev = NULL;
	while(nd) {
		if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
			pcidev = pci_find_slot(pci_bus, pci_devfn);
		if (pcidev) break;
		nd = nd->parent;
	}
	if (pcidev)
		parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
	if (!parent) {
		printk(KERN_WARNING "release_OF_resource(%s), parent not found\n",
			node->name);
		return -ENODEV;
	}

	/* Find us in the parent and its childs */
	res = parent->child;
	start = node->addrs[index].address;
	end = start + node->addrs[index].size - 1;
	while (res) {
		if (res->start == start && res->end == end &&
		    (res->flags & IORESOURCE_BUSY))
		    	break;
		if (res->start <= start && res->end >= end)
			res = res->child;
		else
			res = res->sibling;
	}
	if (!res)
		return -ENODEV;

	if (res->name) {
		kfree(res->name);
		res->name = NULL;
	}
	release_resource(res);
	kfree(res);

	return 0;
}

#if 0
void __openfirmware
print_properties(struct device_node *np)
{
	struct property *pp;
	char *cp;
	int i, n;

	for (pp = np->properties; pp != 0; pp = pp->next) {
		printk(KERN_INFO "%s", pp->name);
		for (i = strlen(pp->name); i < 16; ++i)
			printk(" ");
		cp = (char *) pp->value;
		for (i = pp->length; i > 0; --i, ++cp)
			if ((i > 1 && (*cp < 0x20 || *cp > 0x7e))
			    || (i == 1 && *cp != 0))
				break;
		if (i == 0 && pp->length > 1) {
			/* looks like a string */
			printk(" %s\n", (char *) pp->value);
		} else {
			/* dump it in hex */
			n = pp->length;
			if (n > 64)
				n = 64;
			if (pp->length % 4 == 0) {
				unsigned int *p = (unsigned int *) pp->value;

				n /= 4;
				for (i = 0; i < n; ++i) {
					if (i != 0 && (i % 4) == 0)
						printk("\n                ");
					printk(" %08x", *p++);
				}
			} else {
				unsigned char *bp = pp->value;

				for (i = 0; i < n; ++i) {
					if (i != 0 && (i % 16) == 0)
						printk("\n                ");
					printk(" %02x", *bp++);
				}
			}
			printk("\n");
			if (pp->length > 64)
				printk("                 ... (length = %d)\n",
				       pp->length);
		}
	}
}
#endif

static DEFINE_SPINLOCK(rtas_lock);

/* this can be called after setup -- Cort */
int __openfirmware
call_rtas(const char *service, int nargs, int nret,
	  unsigned long *outputs, ...)
{
	va_list list;
	int i;
	unsigned long s;
	struct device_node *rtas;
	int *tokp;
	union {
		unsigned long words[16];
		double align;
	} u;

	rtas = find_devices("rtas");
	if (rtas == NULL)
		return -1;
	tokp = (int *) get_property(rtas, service, NULL);
	if (tokp == NULL) {
		printk(KERN_ERR "No RTAS service called %s\n", service);
		return -1;
	}
	u.words[0] = *tokp;
	u.words[1] = nargs;
	u.words[2] = nret;
	va_start(list, outputs);
	for (i = 0; i < nargs; ++i)
		u.words[i+3] = va_arg(list, unsigned long);
	va_end(list);

	/*
	 * RTAS doesn't use floating point.
	 * Or at least, according to the CHRP spec we enter RTAS
	 * with FP disabled, and it doesn't change the FP registers.
	 *  -- paulus.
	 */
	spin_lock_irqsave(&rtas_lock, s);
	enter_rtas((void *)__pa(&u));
	spin_unlock_irqrestore(&rtas_lock, s);

	if (nret > 1 && outputs != NULL)
		for (i = 0; i < nret-1; ++i)
			outputs[i] = u.words[i+nargs+4];
	return u.words[nargs+3];
}
OpenPOWER on IntegriCloud