aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/prom_init.c
blob: a820b772927dca15104757730f060d20596166dc (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
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
/*
 * Procedures for interfacing to Open Firmware.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 * 
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com 
 *
 *      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.
 */

#undef DEBUG_PROM

#include <stdarg.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/pci.h>
#include <asm/iommu.h>
#include <asm/btext.h>
#include <asm/sections.h>
#include <asm/machdep.h>

#ifdef CONFIG_LOGO_LINUX_CLUT224
#include <linux/linux_logo.h>
extern const struct linux_logo logo_linux_clut224;
#endif

/*
 * Properties whose value is longer than this get excluded from our
 * copy of the device tree. This value does need to be big enough to
 * ensure that we don't lose things like the interrupt-map property
 * on a PCI-PCI bridge.
 */
#define MAX_PROPERTY_LENGTH	(1UL * 1024 * 1024)

/*
 * Eventually bump that one up
 */
#define DEVTREE_CHUNK_SIZE	0x100000

/*
 * This is the size of the local memory reserve map that gets copied
 * into the boot params passed to the kernel. That size is totally
 * flexible as the kernel just reads the list until it encounters an
 * entry with size 0, so it can be changed without breaking binary
 * compatibility
 */
#define MEM_RESERVE_MAP_SIZE	8

/*
 * prom_init() is called very early on, before the kernel text
 * and data have been mapped to KERNELBASE.  At this point the code
 * is running at whatever address it has been loaded at.
 * On ppc32 we compile with -mrelocatable, which means that references
 * to extern and static variables get relocated automatically.
 * On ppc64 we have to relocate the references explicitly with
 * RELOC.  (Note that strings count as static variables.)
 *
 * Because OF may have mapped I/O devices into the area starting at
 * KERNELBASE, particularly on CHRP machines, we can't safely call
 * OF once the kernel has been mapped to KERNELBASE.  Therefore all
 * OF calls must be done within prom_init().
 *
 * ADDR is used in calls to call_prom.  The 4th and following
 * arguments to call_prom should be 32-bit values.
 * On ppc64, 64 bit values are truncated to 32 bits (and
 * fortunately don't get interpreted as two arguments).
 */
#ifdef CONFIG_PPC64
#define RELOC(x)        (*PTRRELOC(&(x)))
#define ADDR(x)		(u32) add_reloc_offset((unsigned long)(x))
#define OF_WORKAROUNDS	0
#else
#define RELOC(x)	(x)
#define ADDR(x)		(u32) (x)
#define OF_WORKAROUNDS	of_workarounds
int of_workarounds;
#endif

#define OF_WA_CLAIM	1	/* do phys/virt claim separately, then map */
#define OF_WA_LONGTRAIL	2	/* work around longtrail bugs */

#define PROM_BUG() do {						\
        prom_printf("kernel BUG at %s line 0x%x!\n",		\
		    RELOC(__FILE__), __LINE__);			\
        __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR);	\
} while (0)

#ifdef DEBUG_PROM
#define prom_debug(x...)	prom_printf(x)
#else
#define prom_debug(x...)
#endif


typedef u32 prom_arg_t;

struct prom_args {
        u32 service;
        u32 nargs;
        u32 nret;
        prom_arg_t args[10];
};

struct prom_t {
	ihandle root;
	phandle chosen;
	int cpu;
	ihandle stdout;
	ihandle mmumap;
	ihandle memory;
};

struct mem_map_entry {
	u64	base;
	u64	size;
};

typedef u32 cell_t;

extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);

#ifdef CONFIG_PPC64
extern int enter_prom(struct prom_args *args, unsigned long entry);
#else
static inline int enter_prom(struct prom_args *args, unsigned long entry)
{
	return ((int (*)(struct prom_args *))entry)(args);
}
#endif

extern void copy_and_flush(unsigned long dest, unsigned long src,
			   unsigned long size, unsigned long offset);

/* prom structure */
static struct prom_t __initdata prom;

static unsigned long prom_entry __initdata;

#define PROM_SCRATCH_SIZE 256

static char __initdata of_stdout_device[256];
static char __initdata prom_scratch[PROM_SCRATCH_SIZE];

static unsigned long __initdata dt_header_start;
static unsigned long __initdata dt_struct_start, dt_struct_end;
static unsigned long __initdata dt_string_start, dt_string_end;

static unsigned long __initdata prom_initrd_start, prom_initrd_end;

#ifdef CONFIG_PPC64
static int __initdata iommu_force_on;
static int __initdata ppc64_iommu_off;
static unsigned long __initdata prom_tce_alloc_start;
static unsigned long __initdata prom_tce_alloc_end;
#endif

/* Platforms codes are now obsolete in the kernel. Now only used within this
 * file and ultimately gone too. Feel free to change them if you need, they
 * are not shared with anything outside of this file anymore
 */
#define PLATFORM_PSERIES	0x0100
#define PLATFORM_PSERIES_LPAR	0x0101
#define PLATFORM_LPAR		0x0001
#define PLATFORM_POWERMAC	0x0400
#define PLATFORM_GENERIC	0x0500

static int __initdata of_platform;

static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];

static unsigned long __initdata alloc_top;
static unsigned long __initdata alloc_top_high;
static unsigned long __initdata alloc_bottom;
static unsigned long __initdata rmo_top;
static unsigned long __initdata ram_top;

static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
static int __initdata mem_reserve_cnt;

static cell_t __initdata regbuf[1024];


#define MAX_CPU_THREADS 2

/*
 * Error results ... some OF calls will return "-1" on error, some
 * will return 0, some will return either. To simplify, here are
 * macros to use with any ihandle or phandle return value to check if
 * it is valid
 */

#define PROM_ERROR		(-1u)
#define PHANDLE_VALID(p)	((p) != 0 && (p) != PROM_ERROR)
#define IHANDLE_VALID(i)	((i) != 0 && (i) != PROM_ERROR)


/* This is the one and *ONLY* place where we actually call open
 * firmware.
 */

static int __init call_prom(const char *service, int nargs, int nret, ...)
{
	int i;
	struct prom_args args;
	va_list list;

	args.service = ADDR(service);
	args.nargs = nargs;
	args.nret = nret;

	va_start(list, nret);
	for (i = 0; i < nargs; i++)
		args.args[i] = va_arg(list, prom_arg_t);
	va_end(list);

	for (i = 0; i < nret; i++)
		args.args[nargs+i] = 0;

	if (enter_prom(&args, RELOC(prom_entry)) < 0)
		return PROM_ERROR;

	return (nret > 0) ? args.args[nargs] : 0;
}

static int __init call_prom_ret(const char *service, int nargs, int nret,
				prom_arg_t *rets, ...)
{
	int i;
	struct prom_args args;
	va_list list;

	args.service = ADDR(service);
	args.nargs = nargs;
	args.nret = nret;

	va_start(list, rets);
	for (i = 0; i < nargs; i++)
		args.args[i] = va_arg(list, prom_arg_t);
	va_end(list);

	for (i = 0; i < nret; i++)
		args.args[nargs+i] = 0;

	if (enter_prom(&args, RELOC(prom_entry)) < 0)
		return PROM_ERROR;

	if (rets != NULL)
		for (i = 1; i < nret; ++i)
			rets[i-1] = args.args[nargs+i];

	return (nret > 0) ? args.args[nargs] : 0;
}


static void __init prom_print(const char *msg)
{
	const char *p, *q;
	struct prom_t *_prom = &RELOC(prom);

	if (_prom->stdout == 0)
		return;

	for (p = msg; *p != 0; p = q) {
		for (q = p; *q != 0 && *q != '\n'; ++q)
			;
		if (q > p)
			call_prom("write", 3, 1, _prom->stdout, p, q - p);
		if (*q == 0)
			break;
		++q;
		call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
	}
}


static void __init prom_print_hex(unsigned long val)
{
	int i, nibbles = sizeof(val)*2;
	char buf[sizeof(val)*2+1];
	struct prom_t *_prom = &RELOC(prom);

	for (i = nibbles-1;  i >= 0;  i--) {
		buf[i] = (val & 0xf) + '0';
		if (buf[i] > '9')
			buf[i] += ('a'-'0'-10);
		val >>= 4;
	}
	buf[nibbles] = '\0';
	call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
}


static void __init prom_printf(const char *format, ...)
{
	const char *p, *q, *s;
	va_list args;
	unsigned long v;
	struct prom_t *_prom = &RELOC(prom);

	va_start(args, format);
#ifdef CONFIG_PPC64
	format = PTRRELOC(format);
#endif
	for (p = format; *p != 0; p = q) {
		for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
			;
		if (q > p)
			call_prom("write", 3, 1, _prom->stdout, p, q - p);
		if (*q == 0)
			break;
		if (*q == '\n') {
			++q;
			call_prom("write", 3, 1, _prom->stdout,
				  ADDR("\r\n"), 2);
			continue;
		}
		++q;
		if (*q == 0)
			break;
		switch (*q) {
		case 's':
			++q;
			s = va_arg(args, const char *);
			prom_print(s);
			break;
		case 'x':
			++q;
			v = va_arg(args, unsigned long);
			prom_print_hex(v);
			break;
		}
	}
}


static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
				unsigned long align)
{
	struct prom_t *_prom = &RELOC(prom);

	if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
		/*
		 * Old OF requires we claim physical and virtual separately
		 * and then map explicitly (assuming virtual mode)
		 */
		int ret;
		prom_arg_t result;

		ret = call_prom_ret("call-method", 5, 2, &result,
				    ADDR("claim"), _prom->memory,
				    align, size, virt);
		if (ret != 0 || result == -1)
			return -1;
		ret = call_prom_ret("call-method", 5, 2, &result,
				    ADDR("claim"), _prom->mmumap,
				    align, size, virt);
		if (ret != 0) {
			call_prom("call-method", 4, 1, ADDR("release"),
				  _prom->memory, size, virt);
			return -1;
		}
		/* the 0x12 is M (coherence) + PP == read/write */
		call_prom("call-method", 6, 1,
			  ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
		return virt;
	}
	return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
			 (prom_arg_t)align);
}

static void __init __attribute__((noreturn)) prom_panic(const char *reason)
{
#ifdef CONFIG_PPC64
	reason = PTRRELOC(reason);
#endif
	prom_print(reason);
	/* Do not call exit because it clears the screen on pmac
	 * it also causes some sort of double-fault on early pmacs */
	if (RELOC(of_platform) == PLATFORM_POWERMAC)
		asm("trap\n");

	/* ToDo: should put up an SRC here on p/iSeries */
	call_prom("exit", 0, 0);

	for (;;)			/* should never get here */
		;
}


static int __init prom_next_node(phandle *nodep)
{
	phandle node;

	if ((node = *nodep) != 0
	    && (*nodep = call_prom("child", 1, 1, node)) != 0)
		return 1;
	if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
		return 1;
	for (;;) {
		if ((node = call_prom("parent", 1, 1, node)) == 0)
			return 0;
		if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
			return 1;
	}
}

static int inline prom_getprop(phandle node, const char *pname,
			       void *value, size_t valuelen)
{
	return call_prom("getprop", 4, 1, node, ADDR(pname),
			 (u32)(unsigned long) value, (u32) valuelen);
}

static int inline prom_getproplen(phandle node, const char *pname)
{
	return call_prom("getproplen", 2, 1, node, ADDR(pname));
}

static void add_string(char **str, const char *q)
{
	char *p = *str;

	while (*q)
		*p++ = *q++;
	*p++ = ' ';
	*str = p;
}

static char *tohex(unsigned int x)
{
	static char digits[] = "0123456789abcdef";
	static char result[9];
	int i;

	result[8] = 0;
	i = 8;
	do {
		--i;
		result[i] = digits[x & 0xf];
		x >>= 4;
	} while (x != 0 && i > 0);
	return &result[i];
}

static int __init prom_setprop(phandle node, const char *nodename,
			       const char *pname, void *value, size_t valuelen)
{
	char cmd[256], *p;

	if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
		return call_prom("setprop", 4, 1, node, ADDR(pname),
				 (u32)(unsigned long) value, (u32) valuelen);

	/* gah... setprop doesn't work on longtrail, have to use interpret */
	p = cmd;
	add_string(&p, "dev");
	add_string(&p, nodename);
	add_string(&p, tohex((u32)(unsigned long) value));
	add_string(&p, tohex(valuelen));
	add_string(&p, tohex(ADDR(pname)));
	add_string(&p, tohex(strlen(RELOC(pname))));
	add_string(&p, "property");
	*p = 0;
	return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
}

/* We can't use the standard versions because of RELOC headaches. */
#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
			 || ('a' <= (c) && (c) <= 'f') \
			 || ('A' <= (c) && (c) <= 'F'))

#define isdigit(c)	('0' <= (c) && (c) <= '9')
#define islower(c)	('a' <= (c) && (c) <= 'z')
#define toupper(c)	(islower(c) ? ((c) - 'a' + 'A') : (c))

unsigned long prom_strtoul(const char *cp, const char **endp)
{
	unsigned long result = 0, base = 10, value;

	if (*cp == '0') {
		base = 8;
		cp++;
		if (toupper(*cp) == 'X') {
			cp++;
			base = 16;
		}
	}

	while (isxdigit(*cp) &&
	       (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
		result = result * base + value;
		cp++;
	}

	if (endp)
		*endp = cp;

	return result;
}

unsigned long prom_memparse(const char *ptr, const char **retptr)
{
	unsigned long ret = prom_strtoul(ptr, retptr);
	int shift = 0;

	/*
	 * We can't use a switch here because GCC *may* generate a
	 * jump table which won't work, because we're not running at
	 * the address we're linked at.
	 */
	if ('G' == **retptr || 'g' == **retptr)
		shift = 30;

	if ('M' == **retptr || 'm' == **retptr)
		shift = 20;

	if ('K' == **retptr || 'k' == **retptr)
		shift = 10;

	if (shift) {
		ret <<= shift;
		(*retptr)++;
	}

	return ret;
}

/*
 * Early parsing of the command line passed to the kernel, used for
 * "mem=x" and the options that affect the iommu
 */
static void __init early_cmdline_parse(void)
{
	struct prom_t *_prom = &RELOC(prom);
	const char *opt;
	char *p;
	int l = 0;

	RELOC(prom_cmd_line[0]) = 0;
	p = RELOC(prom_cmd_line);
	if ((long)_prom->chosen > 0)
		l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
#ifdef CONFIG_CMDLINE
	if (l <= 0 || p[0] == '\0') /* dbl check */
		strlcpy(RELOC(prom_cmd_line),
			RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
#endif /* CONFIG_CMDLINE */
	prom_printf("command line: %s\n", RELOC(prom_cmd_line));

#ifdef CONFIG_PPC64
	opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
	if (opt) {
		prom_printf("iommu opt is: %s\n", opt);
		opt += 6;
		while (*opt && *opt == ' ')
			opt++;
		if (!strncmp(opt, RELOC("off"), 3))
			RELOC(ppc64_iommu_off) = 1;
		else if (!strncmp(opt, RELOC("force"), 5))
			RELOC(iommu_force_on) = 1;
	}
#endif
}

#ifdef CONFIG_PPC_PSERIES
/*
 * There are two methods for telling firmware what our capabilities are.
 * Newer machines have an "ibm,client-architecture-support" method on the
 * root node.  For older machines, we have to call the "process-elf-header"
 * method in the /packages/elf-loader node, passing it a fake 32-bit
 * ELF header containing a couple of PT_NOTE sections that contain
 * structures that contain various information.
 */

/*
 * New method - extensible architecture description vector.
 *
 * Because the description vector contains a mix of byte and word
 * values, we declare it as an unsigned char array, and use this
 * macro to put word values in.
 */
#define W(x)	((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
		((x) >> 8) & 0xff, (x) & 0xff

/* Option vector bits - generic bits in byte 1 */
#define OV_IGNORE		0x80	/* ignore this vector */
#define OV_CESSATION_POLICY	0x40	/* halt if unsupported option present*/

/* Option vector 1: processor architectures supported */
#define OV1_PPC_2_00		0x80	/* set if we support PowerPC 2.00 */
#define OV1_PPC_2_01		0x40	/* set if we support PowerPC 2.01 */
#define OV1_PPC_2_02		0x20	/* set if we support PowerPC 2.02 */
#define OV1_PPC_2_03		0x10	/* set if we support PowerPC 2.03 */
#define OV1_PPC_2_04		0x08	/* set if we support PowerPC 2.04 */
#define OV1_PPC_2_05		0x04	/* set if we support PowerPC 2.05 */

/* Option vector 2: Open Firmware options supported */
#define OV2_REAL_MODE		0x20	/* set if we want OF in real mode */

/* Option vector 3: processor options supported */
#define OV3_FP			0x80	/* floating point */
#define OV3_VMX			0x40	/* VMX/Altivec */

/* Option vector 5: PAPR/OF options supported */
#define OV5_LPAR		0x80	/* logical partitioning supported */
#define OV5_SPLPAR		0x40	/* shared-processor LPAR supported */
/* ibm,dynamic-reconfiguration-memory property supported */
#define OV5_DRCONF_MEMORY	0x20
#define OV5_LARGE_PAGES		0x10	/* large pages supported */

/*
 * The architecture vector has an array of PVR mask/value pairs,
 * followed by # option vectors - 1, followed by the option vectors.
 */
static unsigned char ibm_architecture_vec[] = {
	W(0xfffe0000), W(0x003a0000),	/* POWER5/POWER5+ */
	W(0xffff0000), W(0x003e0000),	/* POWER6 */
	W(0xfffffffe), W(0x0f000001),	/* all 2.04-compliant and earlier */
	5 - 1,				/* 5 option vectors */

	/* option vector 1: processor architectures supported */
	3 - 1,				/* length */
	0,				/* don't ignore, don't halt */
	OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
	OV1_PPC_2_04 | OV1_PPC_2_05,

	/* option vector 2: Open Firmware options supported */
	34 - 1,				/* length */
	OV2_REAL_MODE,
	0, 0,
	W(0xffffffff),			/* real_base */
	W(0xffffffff),			/* real_size */
	W(0xffffffff),			/* virt_base */
	W(0xffffffff),			/* virt_size */
	W(0xffffffff),			/* load_base */
	W(64),				/* 128MB min RMA */
	W(0xffffffff),			/* full client load */
	0,				/* min RMA percentage of total RAM */
	48,				/* max log_2(hash table size) */

	/* option vector 3: processor options supported */
	3 - 1,				/* length */
	0,				/* don't ignore, don't halt */
	OV3_FP | OV3_VMX,

	/* option vector 4: IBM PAPR implementation */
	2 - 1,				/* length */
	0,				/* don't halt */

	/* option vector 5: PAPR/OF options */
	3 - 1,				/* length */
	0,				/* don't ignore, don't halt */
	OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES,
};

/* Old method - ELF header with PT_NOTE sections */
static struct fake_elf {
	Elf32_Ehdr	elfhdr;
	Elf32_Phdr	phdr[2];
	struct chrpnote {
		u32	namesz;
		u32	descsz;
		u32	type;
		char	name[8];	/* "PowerPC" */
		struct chrpdesc {
			u32	real_mode;
			u32	real_base;
			u32	real_size;
			u32	virt_base;
			u32	virt_size;
			u32	load_base;
		} chrpdesc;
	} chrpnote;
	struct rpanote {
		u32	namesz;
		u32	descsz;
		u32	type;
		char	name[24];	/* "IBM,RPA-Client-Config" */
		struct rpadesc {
			u32	lpar_affinity;
			u32	min_rmo_size;
			u32	min_rmo_percent;
			u32	max_pft_size;
			u32	splpar;
			u32	min_load;
			u32	new_mem_def;
			u32	ignore_me;
		} rpadesc;
	} rpanote;
} fake_elf = {
	.elfhdr = {
		.e_ident = { 0x7f, 'E', 'L', 'F',
			     ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
		.e_type = ET_EXEC,	/* yeah right */
		.e_machine = EM_PPC,
		.e_version = EV_CURRENT,
		.e_phoff = offsetof(struct fake_elf, phdr),
		.e_phentsize = sizeof(Elf32_Phdr),
		.e_phnum = 2
	},
	.phdr = {
		[0] = {
			.p_type = PT_NOTE,
			.p_offset = offsetof(struct fake_elf, chrpnote),
			.p_filesz = sizeof(struct chrpnote)
		}, [1] = {
			.p_type = PT_NOTE,
			.p_offset = offsetof(struct fake_elf, rpanote),
			.p_filesz = sizeof(struct rpanote)
		}
	},
	.chrpnote = {
		.namesz = sizeof("PowerPC"),
		.descsz = sizeof(struct chrpdesc),
		.type = 0x1275,
		.name = "PowerPC",
		.chrpdesc = {
			.real_mode = ~0U,	/* ~0 means "don't care" */
			.real_base = ~0U,
			.real_size = ~0U,
			.virt_base = ~0U,
			.virt_size = ~0U,
			.load_base = ~0U
		},
	},
	.rpanote = {
		.namesz = sizeof("IBM,RPA-Client-Config"),
		.descsz = sizeof(struct rpadesc),
		.type = 0x12759999,
		.name = "IBM,RPA-Client-Config",
		.rpadesc = {
			.lpar_affinity = 0,
			.min_rmo_size = 64,	/* in megabytes */
			.min_rmo_percent = 0,
			.max_pft_size = 48,	/* 2^48 bytes max PFT size */
			.splpar = 1,
			.min_load = ~0U,
			.new_mem_def = 0
		}
	}
};

static void __init prom_send_capabilities(void)
{
	ihandle elfloader, root;
	prom_arg_t ret;

	root = call_prom("open", 1, 1, ADDR("/"));
	if (root != 0) {
		/* try calling the ibm,client-architecture-support method */
		if (call_prom_ret("call-method", 3, 2, &ret,
				  ADDR("ibm,client-architecture-support"),
				  root,
				  ADDR(ibm_architecture_vec)) == 0) {
			/* the call exists... */
			if (ret)
				prom_printf("WARNING: ibm,client-architecture"
					    "-support call FAILED!\n");
			call_prom("close", 1, 0, root);
			return;
		}
		call_prom("close", 1, 0, root);
	}

	/* no ibm,client-architecture-support call, try the old way */
	elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
	if (elfloader == 0) {
		prom_printf("couldn't open /packages/elf-loader\n");
		return;
	}
	call_prom("call-method", 3, 1, ADDR("process-elf-header"),
			elfloader, ADDR(&fake_elf));
	call_prom("close", 1, 0, elfloader);
}
#endif

/*
 * Memory allocation strategy... our layout is normally:
 *
 *  at 14Mb or more we have vmlinux, then a gap and initrd.  In some
 *  rare cases, initrd might end up being before the kernel though.
 *  We assume this won't override the final kernel at 0, we have no
 *  provision to handle that in this version, but it should hopefully
 *  never happen.
 *
 *  alloc_top is set to the top of RMO, eventually shrink down if the
 *  TCEs overlap
 *
 *  alloc_bottom is set to the top of kernel/initrd
 *
 *  from there, allocations are done this way : rtas is allocated
 *  topmost, and the device-tree is allocated from the bottom. We try
 *  to grow the device-tree allocation as we progress. If we can't,
 *  then we fail, we don't currently have a facility to restart
 *  elsewhere, but that shouldn't be necessary.
 *
 *  Note that calls to reserve_mem have to be done explicitly, memory
 *  allocated with either alloc_up or alloc_down isn't automatically
 *  reserved.
 */


/*
 * Allocates memory in the RMO upward from the kernel/initrd
 *
 * When align is 0, this is a special case, it means to allocate in place
 * at the current location of alloc_bottom or fail (that is basically
 * extending the previous allocation). Used for the device-tree flattening
 */
static unsigned long __init alloc_up(unsigned long size, unsigned long align)
{
	unsigned long base = RELOC(alloc_bottom);
	unsigned long addr = 0;

	if (align)
		base = _ALIGN_UP(base, align);
	prom_debug("alloc_up(%x, %x)\n", size, align);
	if (RELOC(ram_top) == 0)
		prom_panic("alloc_up() called with mem not initialized\n");

	if (align)
		base = _ALIGN_UP(RELOC(alloc_bottom), align);
	else
		base = RELOC(alloc_bottom);

	for(; (base + size) <= RELOC(alloc_top); 
	    base = _ALIGN_UP(base + 0x100000, align)) {
		prom_debug("    trying: 0x%x\n\r", base);
		addr = (unsigned long)prom_claim(base, size, 0);
		if (addr != PROM_ERROR && addr != 0)
			break;
		addr = 0;
		if (align == 0)
			break;
	}
	if (addr == 0)
		return 0;
	RELOC(alloc_bottom) = addr;

	prom_debug(" -> %x\n", addr);
	prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
	prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
	prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
	prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
	prom_debug("  ram_top      : %x\n", RELOC(ram_top));

	return addr;
}

/*
 * Allocates memory downward, either from top of RMO, or if highmem
 * is set, from the top of RAM.  Note that this one doesn't handle
 * failures.  It does claim memory if highmem is not set.
 */
static unsigned long __init alloc_down(unsigned long size, unsigned long align,
				       int highmem)
{
	unsigned long base, addr = 0;

	prom_debug("alloc_down(%x, %x, %s)\n", size, align,
		   highmem ? RELOC("(high)") : RELOC("(low)"));
	if (RELOC(ram_top) == 0)
		prom_panic("alloc_down() called with mem not initialized\n");

	if (highmem) {
		/* Carve out storage for the TCE table. */
		addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
		if (addr <= RELOC(alloc_bottom))
			return 0;
		/* Will we bump into the RMO ? If yes, check out that we
		 * didn't overlap existing allocations there, if we did,
		 * we are dead, we must be the first in town !
		 */
		if (addr < RELOC(rmo_top)) {
			/* Good, we are first */
			if (RELOC(alloc_top) == RELOC(rmo_top))
				RELOC(alloc_top) = RELOC(rmo_top) = addr;
			else
				return 0;
		}
		RELOC(alloc_top_high) = addr;
		goto bail;
	}

	base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
	for (; base > RELOC(alloc_bottom);
	     base = _ALIGN_DOWN(base - 0x100000, align))  {
		prom_debug("    trying: 0x%x\n\r", base);
		addr = (unsigned long)prom_claim(base, size, 0);
		if (addr != PROM_ERROR && addr != 0)
			break;
		addr = 0;
	}
	if (addr == 0)
		return 0;
	RELOC(alloc_top) = addr;

 bail:
	prom_debug(" -> %x\n", addr);
	prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
	prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
	prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
	prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
	prom_debug("  ram_top      : %x\n", RELOC(ram_top));

	return addr;
}

/*
 * Parse a "reg" cell
 */
static unsigned long __init prom_next_cell(int s, cell_t **cellp)
{
	cell_t *p = *cellp;
	unsigned long r = 0;

	/* Ignore more than 2 cells */
	while (s > sizeof(unsigned long) / 4) {
		p++;
		s--;
	}
	r = *p++;
#ifdef CONFIG_PPC64
	if (s > 1) {
		r <<= 32;
		r |= *(p++);
	}
#endif
	*cellp = p;
	return r;
}

/*
 * Very dumb function for adding to the memory reserve list, but
 * we don't need anything smarter at this point
 *
 * XXX Eventually check for collisions.  They should NEVER happen.
 * If problems seem to show up, it would be a good start to track
 * them down.
 */
static void reserve_mem(u64 base, u64 size)
{
	u64 top = base + size;
	unsigned long cnt = RELOC(mem_reserve_cnt);

	if (size == 0)
		return;

	/* We need to always keep one empty entry so that we
	 * have our terminator with "size" set to 0 since we are
	 * dumb and just copy this entire array to the boot params
	 */
	base = _ALIGN_DOWN(base, PAGE_SIZE);
	top = _ALIGN_UP(top, PAGE_SIZE);
	size = top - base;

	if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
		prom_panic("Memory reserve map exhausted !\n");
	RELOC(mem_reserve_map)[cnt].base = base;
	RELOC(mem_reserve_map)[cnt].size = size;
	RELOC(mem_reserve_cnt) = cnt + 1;
}

/*
 * Initialize memory allocation mechanism, parse "memory" nodes and
 * obtain that way the top of memory and RMO to setup out local allocator
 */
static void __init prom_init_mem(void)
{
	phandle node;
	char *path, type[64];
	unsigned int plen;
	cell_t *p, *endp;
	struct prom_t *_prom = &RELOC(prom);
	u32 rac, rsc;

	/*
	 * We iterate the memory nodes to find
	 * 1) top of RMO (first node)
	 * 2) top of memory
	 */
	rac = 2;
	prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
	rsc = 1;
	prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
	prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
	prom_debug("root_size_cells: %x\n", (unsigned long) rsc);

	prom_debug("scanning memory:\n");
	path = RELOC(prom_scratch);

	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		prom_getprop(node, "device_type", type, sizeof(type));

		if (type[0] == 0) {
			/*
			 * CHRP Longtrail machines have no device_type
			 * on the memory node, so check the name instead...
			 */
			prom_getprop(node, "name", type, sizeof(type));
		}
		if (strcmp(type, RELOC("memory")))
			continue;

		plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
		if (plen > sizeof(regbuf)) {
			prom_printf("memory node too large for buffer !\n");
			plen = sizeof(regbuf);
		}
		p = RELOC(regbuf);
		endp = p + (plen / sizeof(cell_t));

#ifdef DEBUG_PROM
		memset(path, 0, PROM_SCRATCH_SIZE);
		call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
		prom_debug("  node %s :\n", path);
#endif /* DEBUG_PROM */

		while ((endp - p) >= (rac + rsc)) {
			unsigned long base, size;

			base = prom_next_cell(rac, &p);
			size = prom_next_cell(rsc, &p);

			if (size == 0)
				continue;
			prom_debug("    %x %x\n", base, size);
			if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
				RELOC(rmo_top) = size;
			if ((base + size) > RELOC(ram_top))
				RELOC(ram_top) = base + size;
		}
	}

	RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);

	/* Check if we have an initrd after the kernel, if we do move our bottom
	 * point to after it
	 */
	if (RELOC(prom_initrd_start)) {
		if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
			RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
	}

	/*
	 * Setup our top alloc point, that is top of RMO or top of
	 * segment 0 when running non-LPAR.
	 * Some RS64 machines have buggy firmware where claims up at
	 * 1GB fail.  Cap at 768MB as a workaround.
	 * Since 768MB is plenty of room, and we need to cap to something
	 * reasonable on 32-bit, cap at 768MB on all machines.
	 */
	if (!RELOC(rmo_top))
		RELOC(rmo_top) = RELOC(ram_top);
	RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
	RELOC(alloc_top) = RELOC(rmo_top);
	RELOC(alloc_top_high) = RELOC(ram_top);

	prom_printf("memory layout at init:\n");
	prom_printf("  alloc_bottom : %x\n", RELOC(alloc_bottom));
	prom_printf("  alloc_top    : %x\n", RELOC(alloc_top));
	prom_printf("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
	prom_printf("  rmo_top      : %x\n", RELOC(rmo_top));
	prom_printf("  ram_top      : %x\n", RELOC(ram_top));
}


/*
 * Allocate room for and instantiate RTAS
 */
static void __init prom_instantiate_rtas(void)
{
	phandle rtas_node;
	ihandle rtas_inst;
	u32 base, entry = 0;
	u32 size = 0;

	prom_debug("prom_instantiate_rtas: start...\n");

	rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
	prom_debug("rtas_node: %x\n", rtas_node);
	if (!PHANDLE_VALID(rtas_node))
		return;

	prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
	if (size == 0)
		return;

	base = alloc_down(size, PAGE_SIZE, 0);
	if (base == 0) {
		prom_printf("RTAS allocation failed !\n");
		return;
	}

	rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
	if (!IHANDLE_VALID(rtas_inst)) {
		prom_printf("opening rtas package failed (%x)\n", rtas_inst);
		return;
	}

	prom_printf("instantiating rtas at 0x%x ...", base);

	if (call_prom_ret("call-method", 3, 2, &entry,
			  ADDR("instantiate-rtas"),
			  rtas_inst, base) != 0
	    || entry == 0) {
		prom_printf(" failed\n");
		return;
	}
	prom_printf(" done\n");

	reserve_mem(base, size);

	prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
		     &base, sizeof(base));
	prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
		     &entry, sizeof(entry));

	prom_debug("rtas base     = 0x%x\n", base);
	prom_debug("rtas entry    = 0x%x\n", entry);
	prom_debug("rtas size     = 0x%x\n", (long)size);

	prom_debug("prom_instantiate_rtas: end...\n");
}

#ifdef CONFIG_PPC64
/*
 * Allocate room for and initialize TCE tables
 */
static void __init prom_initialize_tce_table(void)
{
	phandle node;
	ihandle phb_node;
	char compatible[64], type[64], model[64];
	char *path = RELOC(prom_scratch);
	u64 base, align;
	u32 minalign, minsize;
	u64 tce_entry, *tce_entryp;
	u64 local_alloc_top, local_alloc_bottom;
	u64 i;

	if (RELOC(ppc64_iommu_off))
		return;

	prom_debug("starting prom_initialize_tce_table\n");

	/* Cache current top of allocs so we reserve a single block */
	local_alloc_top = RELOC(alloc_top_high);
	local_alloc_bottom = local_alloc_top;

	/* Search all nodes looking for PHBs. */
	for (node = 0; prom_next_node(&node); ) {
		compatible[0] = 0;
		type[0] = 0;
		model[0] = 0;
		prom_getprop(node, "compatible",
			     compatible, sizeof(compatible));
		prom_getprop(node, "device_type", type, sizeof(type));
		prom_getprop(node, "model", model, sizeof(model));

		if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
			continue;

		/* Keep the old logic in tack to avoid regression. */
		if (compatible[0] != 0) {
			if ((strstr(compatible, RELOC("python")) == NULL) &&
			    (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
			    (strstr(compatible, RELOC("Winnipeg")) == NULL))
				continue;
		} else if (model[0] != 0) {
			if ((strstr(model, RELOC("ython")) == NULL) &&
			    (strstr(model, RELOC("peedwagon")) == NULL) &&
			    (strstr(model, RELOC("innipeg")) == NULL))
				continue;
		}

		if (prom_getprop(node, "tce-table-minalign", &minalign,
				 sizeof(minalign)) == PROM_ERROR)
			minalign = 0;
		if (prom_getprop(node, "tce-table-minsize", &minsize,
				 sizeof(minsize)) == PROM_ERROR)
			minsize = 4UL << 20;

		/*
		 * Even though we read what OF wants, we just set the table
		 * size to 4 MB.  This is enough to map 2GB of PCI DMA space.
		 * By doing this, we avoid the pitfalls of trying to DMA to
		 * MMIO space and the DMA alias hole.
		 *
		 * On POWER4, firmware sets the TCE region by assuming
		 * each TCE table is 8MB. Using this memory for anything
		 * else will impact performance, so we always allocate 8MB.
		 * Anton
		 */
		if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
			minsize = 8UL << 20;
		else
			minsize = 4UL << 20;

		/* Align to the greater of the align or size */
		align = max(minalign, minsize);
		base = alloc_down(minsize, align, 1);
		if (base == 0)
			prom_panic("ERROR, cannot find space for TCE table.\n");
		if (base < local_alloc_bottom)
			local_alloc_bottom = base;

		/* It seems OF doesn't null-terminate the path :-( */
		memset(path, 0, sizeof(path));
		/* Call OF to setup the TCE hardware */
		if (call_prom("package-to-path", 3, 1, node,
			      path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
			prom_printf("package-to-path failed\n");
		}

		/* Save away the TCE table attributes for later use. */
		prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
		prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));

		prom_debug("TCE table: %s\n", path);
		prom_debug("\tnode = 0x%x\n", node);
		prom_debug("\tbase = 0x%x\n", base);
		prom_debug("\tsize = 0x%x\n", minsize);

		/* Initialize the table to have a one-to-one mapping
		 * over the allocated size.
		 */
		tce_entryp = (unsigned long *)base;
		for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
			tce_entry = (i << PAGE_SHIFT);
			tce_entry |= 0x3;
			*tce_entryp = tce_entry;
		}

		prom_printf("opening PHB %s", path);
		phb_node = call_prom("open", 1, 1, path);
		if (phb_node == 0)
			prom_printf("... failed\n");
		else
			prom_printf("... done\n");

		call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
			  phb_node, -1, minsize,
			  (u32) base, (u32) (base >> 32));
		call_prom("close", 1, 0, phb_node);
	}

	reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);

	/* These are only really needed if there is a memory limit in
	 * effect, but we don't know so export them always. */
	RELOC(prom_tce_alloc_start) = local_alloc_bottom;
	RELOC(prom_tce_alloc_end) = local_alloc_top;

	/* Flag the first invalid entry */
	prom_debug("ending prom_initialize_tce_table\n");
}
#endif

/*
 * With CHRP SMP we need to use the OF to start the other processors.
 * We can't wait until smp_boot_cpus (the OF is trashed by then)
 * so we have to put the processors into a holding pattern controlled
 * by the kernel (not OF) before we destroy the OF.
 *
 * This uses a chunk of low memory, puts some holding pattern
 * code there and sends the other processors off to there until
 * smp_boot_cpus tells them to do something.  The holding pattern
 * checks that address until its cpu # is there, when it is that
 * cpu jumps to __secondary_start().  smp_boot_cpus() takes care
 * of setting those values.
 *
 * We also use physical address 0x4 here to tell when a cpu
 * is in its holding pattern code.
 *
 * -- Cort
 */
extern void __secondary_hold(void);
extern unsigned long __secondary_hold_spinloop;
extern unsigned long __secondary_hold_acknowledge;

/*
 * We want to reference the copy of __secondary_hold_* in the
 * 0 - 0x100 address range
 */
#define LOW_ADDR(x)	(((unsigned long) &(x)) & 0xff)

static void __init prom_hold_cpus(void)
{
	unsigned long i;
	unsigned int reg;
	phandle node;
	char type[64];
	int cpuid = 0;
	unsigned int interrupt_server[MAX_CPU_THREADS];
	unsigned int cpu_threads, hw_cpu_num;
	int propsize;
	struct prom_t *_prom = &RELOC(prom);
	unsigned long *spinloop
		= (void *) LOW_ADDR(__secondary_hold_spinloop);
	unsigned long *acknowledge
		= (void *) LOW_ADDR(__secondary_hold_acknowledge);
#ifdef CONFIG_PPC64
	/* __secondary_hold is actually a descriptor, not the text address */
	unsigned long secondary_hold
		= __pa(*PTRRELOC((unsigned long *)__secondary_hold));
#else
	unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
#endif

	prom_debug("prom_hold_cpus: start...\n");
	prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
	prom_debug("    1) *spinloop      = 0x%x\n", *spinloop);
	prom_debug("    1) acknowledge    = 0x%x\n",
		   (unsigned long)acknowledge);
	prom_debug("    1) *acknowledge   = 0x%x\n", *acknowledge);
	prom_debug("    1) secondary_hold = 0x%x\n", secondary_hold);

	/* Set the common spinloop variable, so all of the secondary cpus
	 * will block when they are awakened from their OF spinloop.
	 * This must occur for both SMP and non SMP kernels, since OF will
	 * be trashed when we move the kernel.
	 */
	*spinloop = 0;

	/* look for cpus */
	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		prom_getprop(node, "device_type", type, sizeof(type));
		if (strcmp(type, RELOC("cpu")) != 0)
			continue;

		/* Skip non-configured cpus. */
		if (prom_getprop(node, "status", type, sizeof(type)) > 0)
			if (strcmp(type, RELOC("okay")) != 0)
				continue;

		reg = -1;
		prom_getprop(node, "reg", &reg, sizeof(reg));

		prom_debug("\ncpuid        = 0x%x\n", cpuid);
		prom_debug("cpu hw idx   = 0x%x\n", reg);

		/* Init the acknowledge var which will be reset by
		 * the secondary cpu when it awakens from its OF
		 * spinloop.
		 */
		*acknowledge = (unsigned long)-1;

		propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
					&interrupt_server,
					sizeof(interrupt_server));
		if (propsize < 0) {
			/* no property.  old hardware has no SMT */
			cpu_threads = 1;
			interrupt_server[0] = reg; /* fake it with phys id */
		} else {
			/* We have a threaded processor */
			cpu_threads = propsize / sizeof(u32);
			if (cpu_threads > MAX_CPU_THREADS) {
				prom_printf("SMT: too many threads!\n"
					    "SMT: found %x, max is %x\n",
					    cpu_threads, MAX_CPU_THREADS);
				cpu_threads = 1; /* ToDo: panic? */
			}
		}

		hw_cpu_num = interrupt_server[0];
		if (hw_cpu_num != _prom->cpu) {
			/* Primary Thread of non-boot cpu */
			prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
			call_prom("start-cpu", 3, 0, node,
				  secondary_hold, reg);

			for (i = 0; (i < 100000000) && 
			     (*acknowledge == ((unsigned long)-1)); i++ )
				mb();

			if (*acknowledge == reg)
				prom_printf("done\n");
			else
				prom_printf("failed: %x\n", *acknowledge);
		}
#ifdef CONFIG_SMP
		else
			prom_printf("%x : boot cpu     %x\n", cpuid, reg);
#endif /* CONFIG_SMP */

		/* Reserve cpu #s for secondary threads.   They start later. */
		cpuid += cpu_threads;
	}

	if (cpuid > NR_CPUS)
		prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
			    ") exceeded: ignoring extras\n");

	prom_debug("prom_hold_cpus: end...\n");
}


static void __init prom_init_client_services(unsigned long pp)
{
	struct prom_t *_prom = &RELOC(prom);

	/* Get a handle to the prom entry point before anything else */
	RELOC(prom_entry) = pp;

	/* get a handle for the stdout device */
	_prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
	if (!PHANDLE_VALID(_prom->chosen))
		prom_panic("cannot find chosen"); /* msg won't be printed :( */

	/* get device tree root */
	_prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
	if (!PHANDLE_VALID(_prom->root))
		prom_panic("cannot find device tree root"); /* msg won't be printed :( */

	_prom->mmumap = 0;
}

#ifdef CONFIG_PPC32
/*
 * For really old powermacs, we need to map things we claim.
 * For that, we need the ihandle of the mmu.
 * Also, on the longtrail, we need to work around other bugs.
 */
static void __init prom_find_mmu(void)
{
	struct prom_t *_prom = &RELOC(prom);
	phandle oprom;
	char version[64];

	oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
	if (!PHANDLE_VALID(oprom))
		return;
	if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
		return;
	version[sizeof(version) - 1] = 0;
	/* XXX might need to add other versions here */
	if (strcmp(version, "Open Firmware, 1.0.5") == 0)
		of_workarounds = OF_WA_CLAIM;
	else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
		of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
		call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
	} else
		return;
	_prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
	prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
		     sizeof(_prom->mmumap));
	if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
		of_workarounds &= ~OF_WA_CLAIM;		/* hmmm */
}
#else
#define prom_find_mmu()
#endif

static void __init prom_init_stdout(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char *path = RELOC(of_stdout_device);
	char type[16];
	u32 val;

	if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
		prom_panic("cannot find stdout");

	_prom->stdout = val;

	/* Get the full OF pathname of the stdout device */
	memset(path, 0, 256);
	call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
	val = call_prom("instance-to-package", 1, 1, _prom->stdout);
	prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
		     &val, sizeof(val));
	prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
	prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
		     path, strlen(path) + 1);

	/* If it's a display, note it */
	memset(type, 0, sizeof(type));
	prom_getprop(val, "device_type", type, sizeof(type));
	if (strcmp(type, RELOC("display")) == 0)
		prom_setprop(val, path, "linux,boot-display", NULL, 0);
}

static void __init prom_close_stdin(void)
{
	struct prom_t *_prom = &RELOC(prom);
	ihandle val;

	if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
		call_prom("close", 1, 0, val);
}

static int __init prom_find_machine_type(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char compat[256];
	int len, i = 0;
#ifdef CONFIG_PPC64
	phandle rtas;
	int x;
#endif

	/* Look for a PowerMac */
	len = prom_getprop(_prom->root, "compatible",
			   compat, sizeof(compat)-1);
	if (len > 0) {
		compat[len] = 0;
		while (i < len) {
			char *p = &compat[i];
			int sl = strlen(p);
			if (sl == 0)
				break;
			if (strstr(p, RELOC("Power Macintosh")) ||
			    strstr(p, RELOC("MacRISC")))
				return PLATFORM_POWERMAC;
#ifdef CONFIG_PPC64
			/* We must make sure we don't detect the IBM Cell
			 * blades as pSeries due to some firmware issues,
			 * so we do it here.
			 */
			if (strstr(p, RELOC("IBM,CBEA")) ||
			    strstr(p, RELOC("IBM,CPBW-1.0")))
				return PLATFORM_GENERIC;
#endif /* CONFIG_PPC64 */
			i += sl + 1;
		}
	}
#ifdef CONFIG_PPC64
	/* If not a mac, try to figure out if it's an IBM pSeries or any other
	 * PAPR compliant platform. We assume it is if :
	 *  - /device_type is "chrp" (please, do NOT use that for future
	 *    non-IBM designs !
	 *  - it has /rtas
	 */
	len = prom_getprop(_prom->root, "device_type",
			   compat, sizeof(compat)-1);
	if (len <= 0)
		return PLATFORM_GENERIC;
	if (strcmp(compat, RELOC("chrp")))
		return PLATFORM_GENERIC;

	/* Default to pSeries. We need to know if we are running LPAR */
	rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
	if (!PHANDLE_VALID(rtas))
		return PLATFORM_GENERIC;
	x = prom_getproplen(rtas, "ibm,hypertas-functions");
	if (x != PROM_ERROR) {
		prom_printf("Hypertas detected, assuming LPAR !\n");
		return PLATFORM_PSERIES_LPAR;
	}
	return PLATFORM_PSERIES;
#else
	return PLATFORM_GENERIC;
#endif
}

static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
{
	return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
}

/*
 * If we have a display that we don't know how to drive,
 * we will want to try to execute OF's open method for it
 * later.  However, OF will probably fall over if we do that
 * we've taken over the MMU.
 * So we check whether we will need to open the display,
 * and if so, open it now.
 */
static void __init prom_check_displays(void)
{
	char type[16], *path;
	phandle node;
	ihandle ih;
	int i;

	static unsigned char default_colors[] = {
		0x00, 0x00, 0x00,
		0x00, 0x00, 0xaa,
		0x00, 0xaa, 0x00,
		0x00, 0xaa, 0xaa,
		0xaa, 0x00, 0x00,
		0xaa, 0x00, 0xaa,
		0xaa, 0xaa, 0x00,
		0xaa, 0xaa, 0xaa,
		0x55, 0x55, 0x55,
		0x55, 0x55, 0xff,
		0x55, 0xff, 0x55,
		0x55, 0xff, 0xff,
		0xff, 0x55, 0x55,
		0xff, 0x55, 0xff,
		0xff, 0xff, 0x55,
		0xff, 0xff, 0xff
	};
	const unsigned char *clut;

	prom_printf("Looking for displays\n");
	for (node = 0; prom_next_node(&node); ) {
		memset(type, 0, sizeof(type));
		prom_getprop(node, "device_type", type, sizeof(type));
		if (strcmp(type, RELOC("display")) != 0)
			continue;

		/* It seems OF doesn't null-terminate the path :-( */
		path = RELOC(prom_scratch);
		memset(path, 0, PROM_SCRATCH_SIZE);

		/*
		 * leave some room at the end of the path for appending extra
		 * arguments
		 */
		if (call_prom("package-to-path", 3, 1, node, path,
			      PROM_SCRATCH_SIZE-10) == PROM_ERROR)
			continue;
		prom_printf("found display   : %s, opening ... ", path);
		
		ih = call_prom("open", 1, 1, path);
		if (ih == 0) {
			prom_printf("failed\n");
			continue;
		}

		/* Success */
		prom_printf("done\n");
		prom_setprop(node, path, "linux,opened", NULL, 0);

		/* Setup a usable color table when the appropriate
		 * method is available. Should update this to set-colors */
		clut = RELOC(default_colors);
		for (i = 0; i < 32; i++, clut += 3)
			if (prom_set_color(ih, i, clut[0], clut[1],
					   clut[2]) != 0)
				break;

#ifdef CONFIG_LOGO_LINUX_CLUT224
		clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
		for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
			if (prom_set_color(ih, i + 32, clut[0], clut[1],
					   clut[2]) != 0)
				break;
#endif /* CONFIG_LOGO_LINUX_CLUT224 */
	}
}


/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
			      unsigned long needed, unsigned long align)
{
	void *ret;

	*mem_start = _ALIGN(*mem_start, align);
	while ((*mem_start + needed) > *mem_end) {
		unsigned long room, chunk;

		prom_debug("Chunk exhausted, claiming more at %x...\n",
			   RELOC(alloc_bottom));
		room = RELOC(alloc_top) - RELOC(alloc_bottom);
		if (room > DEVTREE_CHUNK_SIZE)
			room = DEVTREE_CHUNK_SIZE;
		if (room < PAGE_SIZE)
			prom_panic("No memory for flatten_device_tree (no room)");
		chunk = alloc_up(room, 0);
		if (chunk == 0)
			prom_panic("No memory for flatten_device_tree (claim failed)");
		*mem_end = RELOC(alloc_top);
	}

	ret = (void *)*mem_start;
	*mem_start += needed;

	return ret;
}

#define dt_push_token(token, mem_start, mem_end) \
	do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)

static unsigned long __init dt_find_string(char *str)
{
	char *s, *os;

	s = os = (char *)RELOC(dt_string_start);
	s += 4;
	while (s <  (char *)RELOC(dt_string_end)) {
		if (strcmp(s, str) == 0)
			return s - os;
		s += strlen(s) + 1;
	}
	return 0;
}

/*
 * The Open Firmware 1275 specification states properties must be 31 bytes or
 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
 */
#define MAX_PROPERTY_NAME 64

static void __init scan_dt_build_strings(phandle node,
					 unsigned long *mem_start,
					 unsigned long *mem_end)
{
	char *prev_name, *namep, *sstart;
	unsigned long soff;
	phandle child;

	sstart =  (char *)RELOC(dt_string_start);

	/* get and store all property names */
	prev_name = RELOC("");
	for (;;) {
		/* 64 is max len of name including nul. */
		namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
		if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
			/* No more nodes: unwind alloc */
			*mem_start = (unsigned long)namep;
			break;
		}

 		/* skip "name" */
 		if (strcmp(namep, RELOC("name")) == 0) {
 			*mem_start = (unsigned long)namep;
 			prev_name = RELOC("name");
 			continue;
 		}
		/* get/create string entry */
		soff = dt_find_string(namep);
		if (soff != 0) {
			*mem_start = (unsigned long)namep;
			namep = sstart + soff;
		} else {
			/* Trim off some if we can */
			*mem_start = (unsigned long)namep + strlen(namep) + 1;
			RELOC(dt_string_end) = *mem_start;
		}
		prev_name = namep;
	}

	/* do all our children */
	child = call_prom("child", 1, 1, node);
	while (child != 0) {
		scan_dt_build_strings(child, mem_start, mem_end);
		child = call_prom("peer", 1, 1, child);
	}
}

static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
					unsigned long *mem_end)
{
	phandle child;
	char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
	unsigned long soff;
	unsigned char *valp;
	static char pname[MAX_PROPERTY_NAME];
	int l, room;

	dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);

	/* get the node's full name */
	namep = (char *)*mem_start;
	room = *mem_end - *mem_start;
	if (room > 255)
		room = 255;
	l = call_prom("package-to-path", 3, 1, node, namep, room);
	if (l >= 0) {
		/* Didn't fit?  Get more room. */
		if (l >= room) {
			if (l >= *mem_end - *mem_start)
				namep = make_room(mem_start, mem_end, l+1, 1);
			call_prom("package-to-path", 3, 1, node, namep, l);
		}
		namep[l] = '\0';

		/* Fixup an Apple bug where they have bogus \0 chars in the
		 * middle of the path in some properties, and extract
		 * the unit name (everything after the last '/').
		 */
		for (lp = p = namep, ep = namep + l; p < ep; p++) {
			if (*p == '/')
				lp = namep;
			else if (*p != 0)
				*lp++ = *p;
		}
		*lp = 0;
		*mem_start = _ALIGN((unsigned long)lp + 1, 4);
	}

	/* get it again for debugging */
	path = RELOC(prom_scratch);
	memset(path, 0, PROM_SCRATCH_SIZE);
	call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);

	/* get and store all properties */
	prev_name = RELOC("");
	sstart = (char *)RELOC(dt_string_start);
	for (;;) {
		if (call_prom("nextprop", 3, 1, node, prev_name,
			      RELOC(pname)) != 1)
			break;

 		/* skip "name" */
 		if (strcmp(RELOC(pname), RELOC("name")) == 0) {
 			prev_name = RELOC("name");
 			continue;
 		}

		/* find string offset */
		soff = dt_find_string(RELOC(pname));
		if (soff == 0) {
			prom_printf("WARNING: Can't find string index for"
				    " <%s>, node %s\n", RELOC(pname), path);
			break;
		}
		prev_name = sstart + soff;

		/* get length */
		l = call_prom("getproplen", 2, 1, node, RELOC(pname));

		/* sanity checks */
		if (l == PROM_ERROR)
			continue;
		if (l > MAX_PROPERTY_LENGTH) {
			prom_printf("WARNING: ignoring large property ");
			/* It seems OF doesn't null-terminate the path :-( */
			prom_printf("[%s] ", path);
			prom_printf("%s length 0x%x\n", RELOC(pname), l);
			continue;
		}

		/* push property head */
		dt_push_token(OF_DT_PROP, mem_start, mem_end);
		dt_push_token(l, mem_start, mem_end);
		dt_push_token(soff, mem_start, mem_end);

		/* push property content */
		valp = make_room(mem_start, mem_end, l, 4);
		call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
		*mem_start = _ALIGN(*mem_start, 4);
	}

	/* Add a "linux,phandle" property. */
	soff = dt_find_string(RELOC("linux,phandle"));
	if (soff == 0)
		prom_printf("WARNING: Can't find string index for"
			    " <linux-phandle> node %s\n", path);
	else {
		dt_push_token(OF_DT_PROP, mem_start, mem_end);
		dt_push_token(4, mem_start, mem_end);
		dt_push_token(soff, mem_start, mem_end);
		valp = make_room(mem_start, mem_end, 4, 4);
		*(u32 *)valp = node;
	}

	/* do all our children */
	child = call_prom("child", 1, 1, node);
	while (child != 0) {
		scan_dt_build_struct(child, mem_start, mem_end);
		child = call_prom("peer", 1, 1, child);
	}

	dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
}

static void __init flatten_device_tree(void)
{
	phandle root;
	unsigned long mem_start, mem_end, room;
	struct boot_param_header *hdr;
	struct prom_t *_prom = &RELOC(prom);
	char *namep;
	u64 *rsvmap;

	/*
	 * Check how much room we have between alloc top & bottom (+/- a
	 * few pages), crop to 4Mb, as this is our "chuck" size
	 */
	room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
	if (room > DEVTREE_CHUNK_SIZE)
		room = DEVTREE_CHUNK_SIZE;
	prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));

	/* Now try to claim that */
	mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
	if (mem_start == 0)
		prom_panic("Can't allocate initial device-tree chunk\n");
	mem_end = RELOC(alloc_top);

	/* Get root of tree */
	root = call_prom("peer", 1, 1, (phandle)0);
	if (root == (phandle)0)
		prom_panic ("couldn't get device tree root\n");

	/* Build header and make room for mem rsv map */ 
	mem_start = _ALIGN(mem_start, 4);
	hdr = make_room(&mem_start, &mem_end,
			sizeof(struct boot_param_header), 4);
	RELOC(dt_header_start) = (unsigned long)hdr;
	rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);

	/* Start of strings */
	mem_start = PAGE_ALIGN(mem_start);
	RELOC(dt_string_start) = mem_start;
	mem_start += 4; /* hole */

	/* Add "linux,phandle" in there, we'll need it */
	namep = make_room(&mem_start, &mem_end, 16, 1);
	strcpy(namep, RELOC("linux,phandle"));
	mem_start = (unsigned long)namep + strlen(namep) + 1;

	/* Build string array */
	prom_printf("Building dt strings...\n"); 
	scan_dt_build_strings(root, &mem_start, &mem_end);
	RELOC(dt_string_end) = mem_start;

	/* Build structure */
	mem_start = PAGE_ALIGN(mem_start);
	RELOC(dt_struct_start) = mem_start;
	prom_printf("Building dt structure...\n"); 
	scan_dt_build_struct(root, &mem_start, &mem_end);
	dt_push_token(OF_DT_END, &mem_start, &mem_end);
	RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);

	/* Finish header */
	hdr->boot_cpuid_phys = _prom->cpu;
	hdr->magic = OF_DT_HEADER;
	hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
	hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
	hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
	hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
	hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
	hdr->version = OF_DT_VERSION;
	/* Version 16 is not backward compatible */
	hdr->last_comp_version = 0x10;

	/* Copy the reserve map in */
	memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));

#ifdef DEBUG_PROM
	{
		int i;
		prom_printf("reserved memory map:\n");
		for (i = 0; i < RELOC(mem_reserve_cnt); i++)
			prom_printf("  %x - %x\n",
				    RELOC(mem_reserve_map)[i].base,
				    RELOC(mem_reserve_map)[i].size);
	}
#endif
	/* Bump mem_reserve_cnt to cause further reservations to fail
	 * since it's too late.
	 */
	RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;

	prom_printf("Device tree strings 0x%x -> 0x%x\n",
		    RELOC(dt_string_start), RELOC(dt_string_end)); 
	prom_printf("Device tree struct  0x%x -> 0x%x\n",
		    RELOC(dt_struct_start), RELOC(dt_struct_end));

}

#ifdef CONFIG_PPC_MAPLE
/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
 * The values are bad, and it doesn't even have the right number of cells. */
static void __init fixup_device_tree_maple(void)
{
	phandle isa;
	u32 isa_ranges[6];

	isa = call_prom("finddevice", 1, 1, ADDR("/ht@0/isa@4"));
	if (!PHANDLE_VALID(isa))
		return;

	if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
		== PROM_ERROR)
		return;

	if (isa_ranges[0] != 0x1 ||
		isa_ranges[1] != 0xf4000000 ||
		isa_ranges[2] != 0x00010000)
		return;

	prom_printf("fixing up bogus ISA range on Maple...\n");

	isa_ranges[0] = 0x1;
	isa_ranges[1] = 0x0;
	isa_ranges[2] = 0x01002000; /* IO space; PCI device = 4 */
	isa_ranges[3] = 0x0;
	isa_ranges[4] = 0x0;
	isa_ranges[5] = 0x00010000;
	prom_setprop(isa, "/ht@0/isa@4", "ranges",
			isa_ranges, sizeof(isa_ranges));
}
#else
#define fixup_device_tree_maple()
#endif

#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
static void __init fixup_device_tree_pmac(void)
{
	phandle u3, i2c, mpic;
	u32 u3_rev;
	u32 interrupts[2];
	u32 parent;

	/* Some G5s have a missing interrupt definition, fix it up here */
	u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
	if (!PHANDLE_VALID(u3))
		return;
	i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
	if (!PHANDLE_VALID(i2c))
		return;
	mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
	if (!PHANDLE_VALID(mpic))
		return;

	/* check if proper rev of u3 */
	if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
	    == PROM_ERROR)
		return;
	if (u3_rev < 0x35 || u3_rev > 0x39)
		return;
	/* does it need fixup ? */
	if (prom_getproplen(i2c, "interrupts") > 0)
		return;

	prom_printf("fixing up bogus interrupts for u3 i2c...\n");

	/* interrupt on this revision of u3 is number 0 and level */
	interrupts[0] = 0;
	interrupts[1] = 1;
	prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
		     &interrupts, sizeof(interrupts));
	parent = (u32)mpic;
	prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
		     &parent, sizeof(parent));
}
#else
#define fixup_device_tree_pmac()
#endif

static void __init fixup_device_tree(void)
{
	fixup_device_tree_maple();
	fixup_device_tree_pmac();
}

static void __init prom_find_boot_cpu(void)
{
       	struct prom_t *_prom = &RELOC(prom);
	u32 getprop_rval;
	ihandle prom_cpu;
	phandle cpu_pkg;

	_prom->cpu = 0;
	if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
		return;

	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);

	prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
	_prom->cpu = getprop_rval;

	prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
}

static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
{
#ifdef CONFIG_BLK_DEV_INITRD
       	struct prom_t *_prom = &RELOC(prom);

	if (r3 && r4 && r4 != 0xdeadbeef) {
		unsigned long val;

		RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
		RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;

		val = RELOC(prom_initrd_start);
		prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
			     &val, sizeof(val));
		val = RELOC(prom_initrd_end);
		prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
			     &val, sizeof(val));

		reserve_mem(RELOC(prom_initrd_start),
			    RELOC(prom_initrd_end) - RELOC(prom_initrd_start));

		prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
		prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
	}
#endif /* CONFIG_BLK_DEV_INITRD */
}

/*
 * We enter here early on, when the Open Firmware prom is still
 * handling exceptions and the MMU hash table for us.
 */

unsigned long __init prom_init(unsigned long r3, unsigned long r4,
			       unsigned long pp,
			       unsigned long r6, unsigned long r7)
{	
       	struct prom_t *_prom;
	unsigned long hdr;
	unsigned long offset = reloc_offset();

#ifdef CONFIG_PPC32
	reloc_got2(offset);
#endif

	_prom = &RELOC(prom);

	/*
	 * First zero the BSS
	 */
	memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);

	/*
	 * Init interface to Open Firmware, get some node references,
	 * like /chosen
	 */
	prom_init_client_services(pp);

	/*
	 * See if this OF is old enough that we need to do explicit maps
	 * and other workarounds
	 */
	prom_find_mmu();

	/*
	 * Init prom stdout device
	 */
	prom_init_stdout();

	/*
	 * Get default machine type. At this point, we do not differentiate
	 * between pSeries SMP and pSeries LPAR
	 */
	RELOC(of_platform) = prom_find_machine_type();

	/* Bail if this is a kdump kernel. */
	if (PHYSICAL_START > 0)
		prom_panic("Error: You can't boot a kdump kernel from OF!\n");

	/*
	 * Check for an initrd
	 */
	prom_check_initrd(r3, r4);

#ifdef CONFIG_PPC_PSERIES
	/*
	 * On pSeries, inform the firmware about our capabilities
	 */
	if (RELOC(of_platform) == PLATFORM_PSERIES ||
	    RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
		prom_send_capabilities();
#endif

	/*
	 * Copy the CPU hold code
	 */
       	if (RELOC(of_platform) != PLATFORM_POWERMAC)
       		copy_and_flush(0, KERNELBASE + offset, 0x100, 0);

	/*
	 * Do early parsing of command line
	 */
	early_cmdline_parse();

	/*
	 * Initialize memory management within prom_init
	 */
	prom_init_mem();

	/*
	 * Determine which cpu is actually running right _now_
	 */
	prom_find_boot_cpu();

	/* 
	 * Initialize display devices
	 */
	prom_check_displays();

#ifdef CONFIG_PPC64
	/*
	 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
	 * that uses the allocator, we need to make sure we get the top of memory
	 * available for us here...
	 */
	if (RELOC(of_platform) == PLATFORM_PSERIES)
		prom_initialize_tce_table();
#endif

	/*
	 * On non-powermacs, try to instantiate RTAS and puts all CPUs
	 * in spin-loops. PowerMacs don't have a working RTAS and use
	 * a different way to spin CPUs
	 */
	if (RELOC(of_platform) != PLATFORM_POWERMAC) {
		prom_instantiate_rtas();
		prom_hold_cpus();
	}

	/*
	 * Fill in some infos for use by the kernel later on
	 */
#ifdef CONFIG_PPC64
	if (RELOC(ppc64_iommu_off))
		prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
			     NULL, 0);

	if (RELOC(iommu_force_on))
		prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
			     NULL, 0);

	if (RELOC(prom_tce_alloc_start)) {
		prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
			     &RELOC(prom_tce_alloc_start),
			     sizeof(prom_tce_alloc_start));
		prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
			     &RELOC(prom_tce_alloc_end),
			     sizeof(prom_tce_alloc_end));
	}
#endif

	/*
	 * Fixup any known bugs in the device-tree
	 */
	fixup_device_tree();

	/*
	 * Now finally create the flattened device-tree
	 */
	prom_printf("copying OF device tree ...\n");
	flatten_device_tree();

	/*
	 * in case stdin is USB and still active on IBM machines...
	 * Unfortunately quiesce crashes on some powermacs if we have
	 * closed stdin already (in particular the powerbook 101).
	 */
	if (RELOC(of_platform) != PLATFORM_POWERMAC)
		prom_close_stdin();

	/*
	 * Call OF "quiesce" method to shut down pending DMA's from
	 * devices etc...
	 */
	prom_printf("Calling quiesce ...\n");
	call_prom("quiesce", 0, 0);

	/*
	 * And finally, call the kernel passing it the flattened device
	 * tree and NULL as r5, thus triggering the new entry point which
	 * is common to us and kexec
	 */
	hdr = RELOC(dt_header_start);
	prom_printf("returning from prom_init\n");
	prom_debug("->dt_header_start=0x%x\n", hdr);

#ifdef CONFIG_PPC32
	reloc_got2(-offset);
#endif

	__start(hdr, KERNELBASE + offset, 0);

	return 0;
}