aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/setup_64.c
blob: a8f7ff5ab1a4cd74e68bba0ff98c63323cc286de (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
/*
 * 
 * Common boot and setup code.
 *
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 *
 *      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

#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/ide.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/utsname.h>
#include <linux/tty.h>
#include <linux/root_dev.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.h>
#include <asm/paca.h>
#include <asm/ppcdebug.h>
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/serial.h>
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/lmb.h>
#include <asm/iSeries/ItLpNaca.h>
#include <asm/firmware.h>
#include <asm/systemcfg.h>

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/*
 * Here are some early debugging facilities. You can enable one
 * but your kernel will not boot on anything else if you do so
 */

/* This one is for use on LPAR machines that support an HVC console
 * on vterm 0
 */
extern void udbg_init_debug_lpar(void);
/* This one is for use on Apple G5 machines
 */
extern void udbg_init_pmac_realmode(void);
/* That's RTAS panel debug */
extern void call_rtas_display_status_delay(unsigned char c);
/* Here's maple real mode debug */
extern void udbg_init_maple_realmode(void);

#define EARLY_DEBUG_INIT() do {} while(0)

#if 0
#define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
#define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
#define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
#define EARLY_DEBUG_INIT()						\
	do { udbg_putc = call_rtas_display_status_delay; } while(0)
#endif

/* extern void *stab; */
extern unsigned long klimit;

extern void mm_init_ppc64(void);
extern void stab_initialize(unsigned long stab);
extern void htab_initialize(void);
extern void early_init_devtree(void *flat_dt);
extern void unflatten_device_tree(void);

extern void smp_release_cpus(void);

int have_of = 1;
int boot_cpuid = 0;
int boot_cpuid_phys = 0;
dev_t boot_dev;
u64 ppc64_pft_size;

struct ppc64_caches ppc64_caches;
EXPORT_SYMBOL_GPL(ppc64_caches);

/*
 * These are used in binfmt_elf.c to put aux entries on the stack
 * for each elf executable being started.
 */
int dcache_bsize;
int icache_bsize;
int ucache_bsize;

/* The main machine-dep calls structure
 */
struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);

#ifdef CONFIG_MAGIC_SYSRQ
unsigned long SYSRQ_KEY;
#endif /* CONFIG_MAGIC_SYSRQ */


static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
static struct notifier_block ppc64_panic_block = {
	.notifier_call = ppc64_panic_event,
	.priority = INT_MIN /* may not return; must be done last */
};

#ifdef CONFIG_SMP

static int smt_enabled_cmdline;

/* Look for ibm,smt-enabled OF option */
static void check_smt_enabled(void)
{
	struct device_node *dn;
	char *smt_option;

	/* Allow the command line to overrule the OF option */
	if (smt_enabled_cmdline)
		return;

	dn = of_find_node_by_path("/options");

	if (dn) {
		smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);

                if (smt_option) {
			if (!strcmp(smt_option, "on"))
				smt_enabled_at_boot = 1;
			else if (!strcmp(smt_option, "off"))
				smt_enabled_at_boot = 0;
                }
        }
}

/* Look for smt-enabled= cmdline option */
static int __init early_smt_enabled(char *p)
{
	smt_enabled_cmdline = 1;

	if (!p)
		return 0;

	if (!strcmp(p, "on") || !strcmp(p, "1"))
		smt_enabled_at_boot = 1;
	else if (!strcmp(p, "off") || !strcmp(p, "0"))
		smt_enabled_at_boot = 0;

	return 0;
}
early_param("smt-enabled", early_smt_enabled);

/**
 * setup_cpu_maps - initialize the following cpu maps:
 *                  cpu_possible_map
 *                  cpu_present_map
 *                  cpu_sibling_map
 *
 * Having the possible map set up early allows us to restrict allocations
 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 *
 * We do not initialize the online map here; cpus set their own bits in
 * cpu_online_map as they come up.
 *
 * This function is valid only for Open Firmware systems.  finish_device_tree
 * must be called before using this.
 *
 * While we're here, we may as well set the "physical" cpu ids in the paca.
 */
static void __init setup_cpu_maps(void)
{
	struct device_node *dn = NULL;
	int cpu = 0;
	int swap_cpuid = 0;

	check_smt_enabled();

	while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
		u32 *intserv;
		int j, len = sizeof(u32), nthreads;

		intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
					      &len);
		if (!intserv)
			intserv = (u32 *)get_property(dn, "reg", NULL);

		nthreads = len / sizeof(u32);

		for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
			cpu_set(cpu, cpu_present_map);
			set_hard_smp_processor_id(cpu, intserv[j]);

			if (intserv[j] == boot_cpuid_phys)
				swap_cpuid = cpu;
			cpu_set(cpu, cpu_possible_map);
			cpu++;
		}
	}

	/* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
	 * boot cpu is logical 0.
	 */
	if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
		u32 tmp;
		tmp = get_hard_smp_processor_id(0);
		set_hard_smp_processor_id(0, boot_cpuid_phys);
		set_hard_smp_processor_id(swap_cpuid, tmp);
	}

	/*
	 * On pSeries LPAR, we need to know how many cpus
	 * could possibly be added to this partition.
	 */
	if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
				(dn = of_find_node_by_path("/rtas"))) {
		int num_addr_cell, num_size_cell, maxcpus;
		unsigned int *ireg;

		num_addr_cell = prom_n_addr_cells(dn);
		num_size_cell = prom_n_size_cells(dn);

		ireg = (unsigned int *)
			get_property(dn, "ibm,lrdr-capacity", NULL);

		if (!ireg)
			goto out;

		maxcpus = ireg[num_addr_cell + num_size_cell];

		/* Double maxcpus for processors which have SMT capability */
		if (cpu_has_feature(CPU_FTR_SMT))
			maxcpus *= 2;

		if (maxcpus > NR_CPUS) {
			printk(KERN_WARNING
			       "Partition configured for %d cpus, "
			       "operating system maximum is %d.\n",
			       maxcpus, NR_CPUS);
			maxcpus = NR_CPUS;
		} else
			printk(KERN_INFO "Partition configured for %d cpus.\n",
			       maxcpus);

		for (cpu = 0; cpu < maxcpus; cpu++)
			cpu_set(cpu, cpu_possible_map);
	out:
		of_node_put(dn);
	}

	/*
	 * Do the sibling map; assume only two threads per processor.
	 */
	for_each_cpu(cpu) {
		cpu_set(cpu, cpu_sibling_map[cpu]);
		if (cpu_has_feature(CPU_FTR_SMT))
			cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
	}

	systemcfg->processorCount = num_present_cpus();
}
#endif /* CONFIG_SMP */

extern struct machdep_calls pSeries_md;
extern struct machdep_calls pmac_md;
extern struct machdep_calls maple_md;
extern struct machdep_calls bpa_md;
extern struct machdep_calls iseries_md;

/* Ultimately, stuff them in an elf section like initcalls... */
static struct machdep_calls __initdata *machines[] = {
#ifdef CONFIG_PPC_PSERIES
	&pSeries_md,
#endif /* CONFIG_PPC_PSERIES */
#ifdef CONFIG_PPC_PMAC
	&pmac_md,
#endif /* CONFIG_PPC_PMAC */
#ifdef CONFIG_PPC_MAPLE
	&maple_md,
#endif /* CONFIG_PPC_MAPLE */
#ifdef CONFIG_PPC_BPA
	&bpa_md,
#endif
#ifdef CONFIG_PPC_ISERIES
	&iseries_md,
#endif
	NULL
};

/*
 * Early initialization entry point. This is called by head.S
 * with MMU translation disabled. We rely on the "feature" of
 * the CPU that ignores the top 2 bits of the address in real
 * mode so we can access kernel globals normally provided we
 * only toy with things in the RMO region. From here, we do
 * some early parsing of the device-tree to setup out LMB
 * data structures, and allocate & initialize the hash table
 * and segment tables so we can start running with translation
 * enabled.
 *
 * It is this function which will call the probe() callback of
 * the various platform types and copy the matching one to the
 * global ppc_md structure. Your platform can eventually do
 * some very early initializations from the probe() routine, but
 * this is not recommended, be very careful as, for example, the
 * device-tree is not accessible via normal means at this point.
 */

void __init early_setup(unsigned long dt_ptr)
{
	struct paca_struct *lpaca = get_paca();
	static struct machdep_calls **mach;

	/*
	 * Enable early debugging if any specified (see top of
	 * this file)
	 */
	EARLY_DEBUG_INIT();

	DBG(" -> early_setup()\n");

	/*
	 * Fill the default DBG level (do we want to keep
	 * that old mecanism around forever ?)
	 */
	ppcdbg_initialize();

	/*
	 * Do early initializations using the flattened device
	 * tree, like retreiving the physical memory map or
	 * calculating/retreiving the hash table size
	 */
	early_init_devtree(__va(dt_ptr));

	/*
	 * Iterate all ppc_md structures until we find the proper
	 * one for the current machine type
	 */
	DBG("Probing machine type for platform %x...\n",
	    systemcfg->platform);

	for (mach = machines; *mach; mach++) {
		if ((*mach)->probe(systemcfg->platform))
			break;
	}
	/* What can we do if we didn't find ? */
	if (*mach == NULL) {
		DBG("No suitable machine found !\n");
		for (;;);
	}
	ppc_md = **mach;

	DBG("Found, Initializing memory management...\n");

	/*
	 * Initialize stab / SLB management
	 */
	if (!firmware_has_feature(FW_FEATURE_ISERIES))
		stab_initialize(lpaca->stab_real);

	/*
	 * Initialize the MMU Hash table and create the linear mapping
	 * of memory
	 */
	htab_initialize();

	DBG(" <- early_setup()\n");
}


/*
 * Initialize some remaining members of the ppc64_caches and systemcfg structures
 * (at least until we get rid of them completely). This is mostly some
 * cache informations about the CPU that will be used by cache flush
 * routines and/or provided to userland
 */
static void __init initialize_cache_info(void)
{
	struct device_node *np;
	unsigned long num_cpus = 0;

	DBG(" -> initialize_cache_info()\n");

	for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
		num_cpus += 1;

		/* We're assuming *all* of the CPUs have the same
		 * d-cache and i-cache sizes... -Peter
		 */

		if ( num_cpus == 1 ) {
			u32 *sizep, *lsizep;
			u32 size, lsize;
			const char *dc, *ic;

			/* Then read cache informations */
			if (systemcfg->platform == PLATFORM_POWERMAC) {
				dc = "d-cache-block-size";
				ic = "i-cache-block-size";
			} else {
				dc = "d-cache-line-size";
				ic = "i-cache-line-size";
			}

			size = 0;
			lsize = cur_cpu_spec->dcache_bsize;
			sizep = (u32 *)get_property(np, "d-cache-size", NULL);
			if (sizep != NULL)
				size = *sizep;
			lsizep = (u32 *) get_property(np, dc, NULL);
			if (lsizep != NULL)
				lsize = *lsizep;
			if (sizep == 0 || lsizep == 0)
				DBG("Argh, can't find dcache properties ! "
				    "sizep: %p, lsizep: %p\n", sizep, lsizep);

			systemcfg->dcache_size = ppc64_caches.dsize = size;
			systemcfg->dcache_line_size =
				ppc64_caches.dline_size = lsize;
			ppc64_caches.log_dline_size = __ilog2(lsize);
			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;

			size = 0;
			lsize = cur_cpu_spec->icache_bsize;
			sizep = (u32 *)get_property(np, "i-cache-size", NULL);
			if (sizep != NULL)
				size = *sizep;
			lsizep = (u32 *)get_property(np, ic, NULL);
			if (lsizep != NULL)
				lsize = *lsizep;
			if (sizep == 0 || lsizep == 0)
				DBG("Argh, can't find icache properties ! "
				    "sizep: %p, lsizep: %p\n", sizep, lsizep);

			systemcfg->icache_size = ppc64_caches.isize = size;
			systemcfg->icache_line_size =
				ppc64_caches.iline_size = lsize;
			ppc64_caches.log_iline_size = __ilog2(lsize);
			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
		}
	}

	/* Add an eye catcher and the systemcfg layout version number */
	strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
	systemcfg->version.major = SYSTEMCFG_MAJOR;
	systemcfg->version.minor = SYSTEMCFG_MINOR;
	systemcfg->processor = mfspr(SPRN_PVR);

	DBG(" <- initialize_cache_info()\n");
}

static void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	u64 *prop;

	DBG(" -> check_for_initrd()\n");

	if (of_chosen) {
		prop = (u64 *)get_property(of_chosen,
				"linux,initrd-start", NULL);
		if (prop != NULL) {
			initrd_start = (unsigned long)__va(*prop);
			prop = (u64 *)get_property(of_chosen,
					"linux,initrd-end", NULL);
			if (prop != NULL) {
				initrd_end = (unsigned long)__va(*prop);
				initrd_below_start_ok = 1;
			} else
				initrd_start = 0;
		}
	}

	/* If we were passed an initrd, set the ROOT_DEV properly if the values
	 * look sensible. If not, clear initrd reference.
	 */
	if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
	    initrd_end > initrd_start)
		ROOT_DEV = Root_RAM0;
	else
		initrd_start = initrd_end = 0;

	if (initrd_start)
		printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

	DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}

/*
 * Do some initial setup of the system.  The parameters are those which 
 * were passed in from the bootloader.
 */
void __init setup_system(void)
{
	DBG(" -> setup_system()\n");

	/*
	 * Unflatten the device-tree passed by prom_init or kexec
	 */
	unflatten_device_tree();

	/*
	 * Fill the ppc64_caches & systemcfg structures with informations
	 * retreived from the device-tree. Need to be called before
	 * finish_device_tree() since the later requires some of the
	 * informations filled up here to properly parse the interrupt
	 * tree.
	 * It also sets up the cache line sizes which allows to call
	 * routines like flush_icache_range (used by the hash init
	 * later on).
	 */
	initialize_cache_info();

#ifdef CONFIG_PPC_RTAS
	/*
	 * Initialize RTAS if available
	 */
	rtas_initialize();
#endif /* CONFIG_PPC_RTAS */

	/*
	 * Check if we have an initrd provided via the device-tree
	 */
	check_for_initrd();

	/*
	 * Do some platform specific early initializations, that includes
	 * setting up the hash table pointers. It also sets up some interrupt-mapping
	 * related options that will be used by finish_device_tree()
	 */
	ppc_md.init_early();

	/*
	 * "Finish" the device-tree, that is do the actual parsing of
	 * some of the properties like the interrupt map
	 */
	finish_device_tree();

#ifdef CONFIG_BOOTX_TEXT
	init_boot_display();
#endif

	/*
	 * Initialize xmon
	 */
#ifdef CONFIG_XMON_DEFAULT
	xmon_init(1);
#endif
	/*
	 * Register early console
	 */
	register_early_udbg_console();

	/* Save unparsed command line copy for /proc/cmdline */
	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);

	parse_early_param();

#ifdef CONFIG_SMP
	/*
	 * iSeries has already initialized the cpu maps at this point.
	 */
	setup_cpu_maps();

	/* Release secondary cpus out of their spinloops at 0x60 now that
	 * we can map physical -> logical CPU ids
	 */
	smp_release_cpus();
#endif

	printk("Starting Linux PPC64 %s\n", system_utsname.version);

	printk("-----------------------------------------------------\n");
	printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
	printk("ppc64_debug_switch            = 0x%lx\n", ppc64_debug_switch);
	printk("ppc64_interrupt_controller    = 0x%ld\n", ppc64_interrupt_controller);
	printk("systemcfg                     = 0x%p\n", systemcfg);
	printk("systemcfg->platform           = 0x%x\n", systemcfg->platform);
	printk("systemcfg->processorCount     = 0x%lx\n", systemcfg->processorCount);
	printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
	printk("ppc64_caches.dcache_line_size = 0x%x\n",
			ppc64_caches.dline_size);
	printk("ppc64_caches.icache_line_size = 0x%x\n",
			ppc64_caches.iline_size);
	printk("htab_address                  = 0x%p\n", htab_address);
	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
	printk("-----------------------------------------------------\n");

	mm_init_ppc64();

	DBG(" <- setup_system()\n");
}

static int ppc64_panic_event(struct notifier_block *this,
                             unsigned long event, void *ptr)
{
	ppc_md.panic((char *)ptr);  /* May not return */
	return NOTIFY_DONE;
}

/*
 * These three variables are used to save values passed to us by prom_init()
 * via the device tree. The TCE variables are needed because with a memory_limit
 * in force we may need to explicitly map the TCE are at the top of RAM.
 */
unsigned long memory_limit;
unsigned long tce_alloc_start;
unsigned long tce_alloc_end;

#ifdef CONFIG_PPC_ISERIES
/*
 * On iSeries we just parse the mem=X option from the command line.
 * On pSeries it's a bit more complicated, see prom_init_mem()
 */
static int __init early_parsemem(char *p)
{
	if (!p)
		return 0;

	memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);

	return 0;
}
early_param("mem", early_parsemem);
#endif /* CONFIG_PPC_ISERIES */

#ifdef CONFIG_IRQSTACKS
static void __init irqstack_early_init(void)
{
	unsigned int i;

	/*
	 * interrupt stacks must be under 256MB, we cannot afford to take
	 * SLB misses on them.
	 */
	for_each_cpu(i) {
		softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
					THREAD_SIZE, 0x10000000));
		hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
					THREAD_SIZE, 0x10000000));
	}
}
#else
#define irqstack_early_init()
#endif

/*
 * Stack space used when we detect a bad kernel stack pointer, and
 * early in SMP boots before relocation is enabled.
 */
static void __init emergency_stack_init(void)
{
	unsigned long limit;
	unsigned int i;

	/*
	 * Emergency stacks must be under 256MB, we cannot afford to take
	 * SLB misses on them. The ABI also requires them to be 128-byte
	 * aligned.
	 *
	 * Since we use these as temporary stacks during secondary CPU
	 * bringup, we need to get at them in real mode. This means they
	 * must also be within the RMO region.
	 */
	limit = min(0x10000000UL, lmb.rmo_size);

	for_each_cpu(i)
		paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
						limit)) + PAGE_SIZE;
}

extern unsigned long *sys_call_table;
extern unsigned long sys_ni_syscall;
#ifdef CONFIG_PPC_MERGE
#define SYS_CALL_ENTRY64(i)	sys_call_table[(i) * 2]
#define SYS_CALL_ENTRY32(i)	sys_call_table[(i) * 2 + 1]
#else
extern unsigned long *sys_call_table32;
#define SYS_CALL_ENTRY64(i)	sys_call_table[(i)]
#define SYS_CALL_ENTRY32(i)	sys_call_table32[(i)]
#endif

/*
 * Called from setup_arch to initialize the bitmap of available
 * syscalls in the systemcfg page
 */
void __init setup_syscall_map(void)
{
	unsigned int i, count64 = 0, count32 = 0;

	for (i = 0; i < __NR_syscalls; i++) {
		if (SYS_CALL_ENTRY64(i) != sys_ni_syscall) {
			count64++;
			systemcfg->syscall_map_64[i >> 5] |=
				0x80000000UL >> (i & 0x1f);
		}
		if (SYS_CALL_ENTRY32(i) != sys_ni_syscall) {
			count32++;
			systemcfg->syscall_map_32[i >> 5] |=
				0x80000000UL >> (i & 0x1f);
		}
	}
	printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
	       count32, count64);
}

/*
 * Called into from start_kernel, after lock_kernel has been called.
 * Initializes bootmem, which is unsed to manage page allocation until
 * mem_init is called.
 */
void __init setup_arch(char **cmdline_p)
{
	extern void do_init_bootmem(void);

	ppc64_boot_msg(0x12, "Setup Arch");

	*cmdline_p = cmd_line;

	/*
	 * Set cache line size based on type of cpu as a default.
	 * Systems with OF can look in the properties on the cpu node(s)
	 * for a possibly more accurate value.
	 */
	dcache_bsize = ppc64_caches.dline_size;
	icache_bsize = ppc64_caches.iline_size;

	/* reboot on panic */
	panic_timeout = 180;

	if (ppc_md.panic)
		notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);

	init_mm.start_code = PAGE_OFFSET;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = klimit;
	
	irqstack_early_init();
	emergency_stack_init();

	stabs_alloc();

	/* set up the bootmem stuff with available memory */
	do_init_bootmem();
	sparse_init();

	/* initialize the syscall map in systemcfg */
	setup_syscall_map();

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

	ppc_md.setup_arch();

	/* Use the default idle loop if the platform hasn't provided one. */
	if (NULL == ppc_md.idle_loop) {
		ppc_md.idle_loop = default_idle;
		printk(KERN_INFO "Using default idle loop\n");
	}

	paging_init();
	ppc64_boot_msg(0x15, "Setup Done");
}


/* ToDo: do something useful if ppc_md is not yet setup. */
#define PPC64_LINUX_FUNCTION 0x0f000000
#define PPC64_IPL_MESSAGE 0xc0000000
#define PPC64_TERM_MESSAGE 0xb0000000

static void ppc64_do_msg(unsigned int src, const char *msg)
{
	if (ppc_md.progress) {
		char buf[128];

		sprintf(buf, "%08X\n", src);
		ppc_md.progress(buf, 0);
		snprintf(buf, 128, "%s", msg);
		ppc_md.progress(buf, 0);
	}
}

/* Print a boot progress message. */
void ppc64_boot_msg(unsigned int src, const char *msg)
{
	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
	printk("[boot]%04x %s\n", src, msg);
}

/* Print a termination message (print only -- does not stop the kernel) */
void ppc64_terminate_msg(unsigned int src, const char *msg)
{
	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
	printk("[terminate]%04x %s\n", src, msg);
}

#ifndef CONFIG_PPC_ISERIES
/*
 * This function can be used by platforms to "find" legacy serial ports.
 * It works for "serial" nodes under an "isa" node, and will try to
 * respect the "ibm,aix-loc" property if any. It works with up to 8
 * ports.
 */

#define MAX_LEGACY_SERIAL_PORTS	8
static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
static unsigned int old_serial_count;

void __init generic_find_legacy_serial_ports(u64 *physport,
		unsigned int *default_speed)
{
	struct device_node *np;
	u32 *sizeprop;

	struct isa_reg_property {
		u32 space;
		u32 address;
		u32 size;
	};
	struct pci_reg_property {
		struct pci_address addr;
		u32 size_hi;
		u32 size_lo;
	};                                                                        

	DBG(" -> generic_find_legacy_serial_port()\n");

	*physport = 0;
	if (default_speed)
		*default_speed = 0;

	np = of_find_node_by_path("/");
	if (!np)
		return;

	/* First fill our array */
	for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
		struct device_node *isa, *pci;
		struct isa_reg_property *reg;
		unsigned long phys_size, addr_size, io_base;
		u32 *rangesp;
		u32 *interrupts, *clk, *spd;
		char *typep;
		int index, rlen, rentsize;

		/* Ok, first check if it's under an "isa" parent */
		isa = of_get_parent(np);
		if (!isa || strcmp(isa->name, "isa")) {
			DBG("%s: no isa parent found\n", np->full_name);
			continue;
		}
		
		/* Now look for an "ibm,aix-loc" property that gives us ordering
		 * if any...
		 */
	 	typep = (char *)get_property(np, "ibm,aix-loc", NULL);

		/* Get the ISA port number */
		reg = (struct isa_reg_property *)get_property(np, "reg", NULL);	
		if (reg == NULL)
			goto next_port;
		/* We assume the interrupt number isn't translated ... */
		interrupts = (u32 *)get_property(np, "interrupts", NULL);
		/* get clock freq. if present */
		clk = (u32 *)get_property(np, "clock-frequency", NULL);
		/* get default speed if present */
		spd = (u32 *)get_property(np, "current-speed", NULL);
		/* Default to locate at end of array */
		index = old_serial_count; /* end of the array by default */

		/* If we have a location index, then use it */
		if (typep && *typep == 'S') {
			index = simple_strtol(typep+1, NULL, 0) - 1;
			/* if index is out of range, use end of array instead */
			if (index >= MAX_LEGACY_SERIAL_PORTS)
				index = old_serial_count;
			/* if our index is still out of range, that mean that
			 * array is full, we could scan for a free slot but that
			 * make little sense to bother, just skip the port
			 */
			if (index >= MAX_LEGACY_SERIAL_PORTS)
				goto next_port;
			if (index >= old_serial_count)
				old_serial_count = index + 1;
			/* Check if there is a port who already claimed our slot */
			if (serial_ports[index].iobase != 0) {
				/* if we still have some room, move it, else override */
				if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
					DBG("Moved legacy port %d -> %d\n", index,
					    old_serial_count);
					serial_ports[old_serial_count++] =
						serial_ports[index];
				} else {
					DBG("Replacing legacy port %d\n", index);
				}
			}
		}
		if (index >= MAX_LEGACY_SERIAL_PORTS)
			goto next_port;
		if (index >= old_serial_count)
			old_serial_count = index + 1;

		/* Now fill the entry */
		memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
		serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
		serial_ports[index].iobase = reg->address;
		serial_ports[index].irq = interrupts ? interrupts[0] : 0;
		serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;

		DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
		    index,
		    serial_ports[index].iobase,
		    serial_ports[index].irq,
		    serial_ports[index].uartclk);

		/* Get phys address of IO reg for port 1 */
		if (index != 0)
			goto next_port;

		pci = of_get_parent(isa);
		if (!pci) {
			DBG("%s: no pci parent found\n", np->full_name);
			goto next_port;
		}

		rangesp = (u32 *)get_property(pci, "ranges", &rlen);
		if (rangesp == NULL) {
			of_node_put(pci);
			goto next_port;
		}
		rlen /= 4;

		/* we need the #size-cells of the PCI bridge node itself */
		phys_size = 1;
		sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
		if (sizeprop != NULL)
			phys_size = *sizeprop;
		/* we need the parent #addr-cells */
		addr_size = prom_n_addr_cells(pci);
		rentsize = 3 + addr_size + phys_size;
		io_base = 0;
		for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
			if (((rangesp[0] >> 24) & 0x3) != 1)
				continue; /* not IO space */
			io_base = rangesp[3];
			if (addr_size == 2)
				io_base = (io_base << 32) | rangesp[4];
		}
		if (io_base != 0) {
			*physport = io_base + reg->address;
			if (default_speed && spd)
				*default_speed = *spd;
		}
		of_node_put(pci);
	next_port:
		of_node_put(isa);
	}

	DBG(" <- generic_find_legacy_serial_port()\n");
}

static struct platform_device serial_device = {
	.name	= "serial8250",
	.id	= PLAT8250_DEV_PLATFORM,
	.dev	= {
		.platform_data = serial_ports,
	},
};

static int __init serial_dev_init(void)
{
	return platform_device_register(&serial_device);
}
arch_initcall(serial_dev_init);

#endif /* CONFIG_PPC_ISERIES */

int check_legacy_ioport(unsigned long base_port)
{
	if (ppc_md.check_legacy_ioport == NULL)
		return 0;
	return ppc_md.check_legacy_ioport(base_port);
}
EXPORT_SYMBOL(check_legacy_ioport);

#ifdef CONFIG_XMON
static int __init early_xmon(char *p)
{
	/* ensure xmon is enabled */
	if (p) {
		if (strncmp(p, "on", 2) == 0)
			xmon_init(1);
		if (strncmp(p, "off", 3) == 0)
			xmon_init(0);
		if (strncmp(p, "early", 5) != 0)
			return 0;
	}
	xmon_init(1);
	debugger(NULL);

	return 0;
}
early_param("xmon", early_xmon);
#endif

void cpu_die(void)
{
	if (ppc_md.cpu_die)
		ppc_md.cpu_die();
}