summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/setup.c
blob: 696c9e007a369d8df883317bdde15c1717a5bfef (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
// SPDX-License-Identifier: GPL-2.0
/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2012
 *    Author(s): Hartmut Penner (hp@de.ibm.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "arch/i386/kernel/setup.c"
 *    Copyright (C) 1995, Linus Torvalds
 */

/*
 * This file handles the architecture-dependent parts of initialization
 */

#define KMSG_COMPONENT "setup"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/errno.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/kernel_stat.h>
#include <linux/dma-map-ops.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/pfn.h>
#include <linux/ctype.h>
#include <linux/reboot.h>
#include <linux/topology.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/memory.h>
#include <linux/compat.h>
#include <linux/start_kernel.h>
#include <linux/hugetlb.h>
#include <linux/kmemleak.h>

#include <asm/archrandom.h>
#include <asm/boot_data.h>
#include <asm/ipl.h>
#include <asm/facility.h>
#include <asm/smp.h>
#include <asm/mmu_context.h>
#include <asm/cpcmd.h>
#include <asm/abs_lowcore.h>
#include <asm/nmi.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/ebcdic.h>
#include <asm/diag.h>
#include <asm/os_info.h>
#include <asm/sclp.h>
#include <asm/stacktrace.h>
#include <asm/sysinfo.h>
#include <asm/numa.h>
#include <asm/alternative.h>
#include <asm/nospec-branch.h>
#include <asm/mem_detect.h>
#include <asm/maccess.h>
#include <asm/uv.h>
#include <asm/asm-offsets.h>
#include "entry.h"

/*
 * Machine setup..
 */
unsigned int console_mode = 0;
EXPORT_SYMBOL(console_mode);

unsigned int console_devno = -1;
EXPORT_SYMBOL(console_devno);

unsigned int console_irq = -1;
EXPORT_SYMBOL(console_irq);

/*
 * Some code and data needs to stay below 2 GB, even when the kernel would be
 * relocated above 2 GB, because it has to use 31 bit addresses.
 * Such code and data is part of the .amode31 section.
 */
unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31;
struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;

/*
 * Control registers CR2, CR5 and CR15 are initialized with addresses
 * of tables that must be placed below 2G which is handled by the AMODE31
 * sections.
 * Because the AMODE31 sections are relocated below 2G at startup,
 * the content of control registers CR2, CR5 and CR15 must be updated
 * with new addresses after the relocation. The initial initialization of
 * control registers occurs in head64.S and then gets updated again after AMODE31
 * relocation. We must access the relevant AMODE31 tables indirectly via
 * pointers placed in the .amode31.refs linker section. Those pointers get
 * updated automatically during AMODE31 relocation and always contain a valid
 * address within AMODE31 sections.
 */

static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);

static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
	[1] = 0xffffffffffffffff
};

static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0
};

static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
	0, 0, 0x89000000, 0,
	0, 0, 0x8a000000, 0
};

static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;

int __bootdata(noexec_disabled);
unsigned long __bootdata(ident_map_size);
struct mem_detect_info __bootdata(mem_detect);
struct initrd_data __bootdata(initrd_data);

unsigned long __bootdata_preserved(__kaslr_offset);
unsigned long __bootdata(__amode31_base);
unsigned int __bootdata_preserved(zlib_dfltcc_support);
EXPORT_SYMBOL(zlib_dfltcc_support);
u64 __bootdata_preserved(stfle_fac_list[16]);
EXPORT_SYMBOL(stfle_fac_list);
u64 __bootdata_preserved(alt_stfle_fac_list[16]);
struct oldmem_data __bootdata_preserved(oldmem_data);

unsigned long VMALLOC_START;
EXPORT_SYMBOL(VMALLOC_START);

unsigned long VMALLOC_END;
EXPORT_SYMBOL(VMALLOC_END);

struct page *vmemmap;
EXPORT_SYMBOL(vmemmap);
unsigned long vmemmap_size;

unsigned long MODULES_VADDR;
unsigned long MODULES_END;

/* An array with a pointer to the lowcore of every CPU. */
struct lowcore *lowcore_ptr[NR_CPUS];
EXPORT_SYMBOL(lowcore_ptr);

DEFINE_STATIC_KEY_FALSE(cpu_has_bear);

/*
 * The Write Back bit position in the physaddr is given by the SLPC PCI.
 * Leaving the mask zero always uses write through which is safe
 */
unsigned long mio_wb_bit_mask __ro_after_init;

/*
 * This is set up by the setup-routine at boot-time
 * for S390 need to find out, what we have to setup
 * using address 0x10400 ...
 */

#include <asm/setup.h>

/*
 * condev= and conmode= setup parameter.
 */

static int __init condev_setup(char *str)
{
	int vdev;

	vdev = simple_strtoul(str, &str, 0);
	if (vdev >= 0 && vdev < 65536) {
		console_devno = vdev;
		console_irq = -1;
	}
	return 1;
}

__setup("condev=", condev_setup);

static void __init set_preferred_console(void)
{
	if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
		add_preferred_console("ttyS", 0, NULL);
	else if (CONSOLE_IS_3270)
		add_preferred_console("tty3270", 0, NULL);
	else if (CONSOLE_IS_VT220)
		add_preferred_console("ttysclp", 0, NULL);
	else if (CONSOLE_IS_HVC)
		add_preferred_console("hvc", 0, NULL);
}

static int __init conmode_setup(char *str)
{
#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
	if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
                SET_CONSOLE_SCLP;
#endif
#if defined(CONFIG_TN3215_CONSOLE)
	if (!strcmp(str, "3215"))
		SET_CONSOLE_3215;
#endif
#if defined(CONFIG_TN3270_CONSOLE)
	if (!strcmp(str, "3270"))
		SET_CONSOLE_3270;
#endif
	set_preferred_console();
        return 1;
}

__setup("conmode=", conmode_setup);

static void __init conmode_default(void)
{
	char query_buffer[1024];
	char *ptr;

        if (MACHINE_IS_VM) {
		cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
		console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
		ptr = strstr(query_buffer, "SUBCHANNEL =");
		console_irq = simple_strtoul(ptr + 13, NULL, 16);
		cpcmd("QUERY TERM", query_buffer, 1024, NULL);
		ptr = strstr(query_buffer, "CONMODE");
		/*
		 * Set the conmode to 3215 so that the device recognition 
		 * will set the cu_type of the console to 3215. If the
		 * conmode is 3270 and we don't set it back then both
		 * 3215 and the 3270 driver will try to access the console
		 * device (3215 as console and 3270 as normal tty).
		 */
		cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
		if (ptr == NULL) {
#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
			SET_CONSOLE_SCLP;
#endif
			return;
		}
		if (str_has_prefix(ptr + 8, "3270")) {
#if defined(CONFIG_TN3270_CONSOLE)
			SET_CONSOLE_3270;
#elif defined(CONFIG_TN3215_CONSOLE)
			SET_CONSOLE_3215;
#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
			SET_CONSOLE_SCLP;
#endif
		} else if (str_has_prefix(ptr + 8, "3215")) {
#if defined(CONFIG_TN3215_CONSOLE)
			SET_CONSOLE_3215;
#elif defined(CONFIG_TN3270_CONSOLE)
			SET_CONSOLE_3270;
#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
			SET_CONSOLE_SCLP;
#endif
		}
	} else if (MACHINE_IS_KVM) {
		if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
			SET_CONSOLE_VT220;
		else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
			SET_CONSOLE_SCLP;
		else
			SET_CONSOLE_HVC;
	} else {
#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
		SET_CONSOLE_SCLP;
#endif
	}
}

#ifdef CONFIG_CRASH_DUMP
static void __init setup_zfcpdump(void)
{
	if (!is_ipl_type_dump())
		return;
	if (oldmem_data.start)
		return;
	strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
	console_loglevel = 2;
}
#else
static inline void setup_zfcpdump(void) {}
#endif /* CONFIG_CRASH_DUMP */

 /*
 * Reboot, halt and power_off stubs. They just call _machine_restart,
 * _machine_halt or _machine_power_off. 
 */

void machine_restart(char *command)
{
	if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
		/*
		 * Only unblank the console if we are called in enabled
		 * context or a bust_spinlocks cleared the way for us.
		 */
		console_unblank();
	_machine_restart(command);
}

void machine_halt(void)
{
	if (!in_interrupt() || oops_in_progress)
		/*
		 * Only unblank the console if we are called in enabled
		 * context or a bust_spinlocks cleared the way for us.
		 */
		console_unblank();
	_machine_halt();
}

void machine_power_off(void)
{
	if (!in_interrupt() || oops_in_progress)
		/*
		 * Only unblank the console if we are called in enabled
		 * context or a bust_spinlocks cleared the way for us.
		 */
		console_unblank();
	_machine_power_off();
}

/*
 * Dummy power off function.
 */
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL_GPL(pm_power_off);

void *restart_stack;

unsigned long stack_alloc(void)
{
#ifdef CONFIG_VMAP_STACK
	void *ret;

	ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
			     NUMA_NO_NODE, __builtin_return_address(0));
	kmemleak_not_leak(ret);
	return (unsigned long)ret;
#else
	return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
#endif
}

void stack_free(unsigned long stack)
{
#ifdef CONFIG_VMAP_STACK
	vfree((void *) stack);
#else
	free_pages(stack, THREAD_SIZE_ORDER);
#endif
}

int __init arch_early_irq_init(void)
{
	unsigned long stack;

	stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
	if (!stack)
		panic("Couldn't allocate async stack");
	S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
	return 0;
}

void __init arch_call_rest_init(void)
{
	unsigned long stack;

	smp_reinit_ipl_cpu();
	stack = stack_alloc();
	if (!stack)
		panic("Couldn't allocate kernel stack");
	current->stack = (void *) stack;
#ifdef CONFIG_VMAP_STACK
	current->stack_vm_area = (void *) stack;
#endif
	set_task_stack_end_magic(current);
	stack += STACK_INIT_OFFSET;
	S390_lowcore.kernel_stack = stack;
	call_on_stack_noreturn(rest_init, stack);
}

static void __init setup_lowcore_dat_off(void)
{
	unsigned long int_psw_mask = PSW_KERNEL_BITS;
	struct lowcore *abs_lc, *lc;
	unsigned long mcck_stack;
	unsigned long flags;

	if (IS_ENABLED(CONFIG_KASAN))
		int_psw_mask |= PSW_MASK_DAT;

	/*
	 * Setup lowcore for boot cpu
	 */
	BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
	lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
	if (!lc)
		panic("%s: Failed to allocate %zu bytes align=%zx\n",
		      __func__, sizeof(*lc), sizeof(*lc));

	lc->restart_psw.mask = PSW_KERNEL_BITS;
	lc->restart_psw.addr = (unsigned long) restart_int_handler;
	lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
	lc->external_new_psw.addr = (unsigned long) ext_int_handler;
	lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
	lc->svc_new_psw.addr = (unsigned long) system_call;
	lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
	lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
	lc->mcck_new_psw.mask = int_psw_mask;
	lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
	lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
	lc->io_new_psw.addr = (unsigned long) io_int_handler;
	lc->clock_comparator = clock_comparator_max;
	lc->nodat_stack = ((unsigned long) &init_thread_union)
		+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
	lc->current_task = (unsigned long)&init_task;
	lc->lpp = LPP_MAGIC;
	lc->machine_flags = S390_lowcore.machine_flags;
	lc->preempt_count = S390_lowcore.preempt_count;
	nmi_alloc_mcesa_early(&lc->mcesad);
	lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
	lc->exit_timer = S390_lowcore.exit_timer;
	lc->user_timer = S390_lowcore.user_timer;
	lc->system_timer = S390_lowcore.system_timer;
	lc->steal_timer = S390_lowcore.steal_timer;
	lc->last_update_timer = S390_lowcore.last_update_timer;
	lc->last_update_clock = S390_lowcore.last_update_clock;

	/*
	 * Allocate the global restart stack which is the same for
	 * all CPUs in cast *one* of them does a PSW restart.
	 */
	restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
	if (!restart_stack)
		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
		      __func__, THREAD_SIZE, THREAD_SIZE);
	restart_stack += STACK_INIT_OFFSET;

	/*
	 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
	 * restart data to the absolute zero lowcore. This is necessary if
	 * PSW restart is done on an offline CPU that has lowcore zero.
	 */
	lc->restart_stack = (unsigned long) restart_stack;
	lc->restart_fn = (unsigned long) do_restart;
	lc->restart_data = 0;
	lc->restart_source = -1U;

	abs_lc = get_abs_lowcore(&flags);
	abs_lc->restart_stack = lc->restart_stack;
	abs_lc->restart_fn = lc->restart_fn;
	abs_lc->restart_data = lc->restart_data;
	abs_lc->restart_source = lc->restart_source;
	abs_lc->restart_psw = lc->restart_psw;
	abs_lc->mcesad = lc->mcesad;
	put_abs_lowcore(abs_lc, flags);

	mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
	if (!mcck_stack)
		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
		      __func__, THREAD_SIZE, THREAD_SIZE);
	lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;

	lc->spinlock_lockval = arch_spin_lockval(0);
	lc->spinlock_index = 0;
	arch_spin_lock_setup(0);
	lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
	lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
	lc->preempt_count = PREEMPT_DISABLED;

	set_prefix(__pa(lc));
	lowcore_ptr[0] = lc;
}

static void __init setup_lowcore_dat_on(void)
{
	struct lowcore *abs_lc;
	unsigned long flags;
	int i;

	__ctl_clear_bit(0, 28);
	S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
	S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
	S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
	S390_lowcore.mcck_new_psw.mask |= PSW_MASK_DAT;
	S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
	__ctl_set_bit(0, 28);
	__ctl_store(S390_lowcore.cregs_save_area, 0, 15);
	if (abs_lowcore_map(0, lowcore_ptr[0], true))
		panic("Couldn't setup absolute lowcore");
	abs_lowcore_mapped = true;
	abs_lc = get_abs_lowcore(&flags);
	abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
	abs_lc->program_new_psw = S390_lowcore.program_new_psw;
	for (i = 0; i < 16; i++)
		abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i];
	put_abs_lowcore(abs_lc, flags);
}

static struct resource code_resource = {
	.name  = "Kernel code",
	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
};

static struct resource data_resource = {
	.name = "Kernel data",
	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
};

static struct resource bss_resource = {
	.name = "Kernel bss",
	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
};

static struct resource __initdata *standard_resources[] = {
	&code_resource,
	&data_resource,
	&bss_resource,
};

static void __init setup_resources(void)
{
	struct resource *res, *std_res, *sub_res;
	phys_addr_t start, end;
	int j;
	u64 i;

	code_resource.start = (unsigned long) _text;
	code_resource.end = (unsigned long) _etext - 1;
	data_resource.start = (unsigned long) _etext;
	data_resource.end = (unsigned long) _edata - 1;
	bss_resource.start = (unsigned long) __bss_start;
	bss_resource.end = (unsigned long) __bss_stop - 1;

	for_each_mem_range(i, &start, &end) {
		res = memblock_alloc(sizeof(*res), 8);
		if (!res)
			panic("%s: Failed to allocate %zu bytes align=0x%x\n",
			      __func__, sizeof(*res), 8);
		res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;

		res->name = "System RAM";
		res->start = start;
		/*
		 * In memblock, end points to the first byte after the
		 * range while in resourses, end points to the last byte in
		 * the range.
		 */
		res->end = end - 1;
		request_resource(&iomem_resource, res);

		for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
			std_res = standard_resources[j];
			if (std_res->start < res->start ||
			    std_res->start > res->end)
				continue;
			if (std_res->end > res->end) {
				sub_res = memblock_alloc(sizeof(*sub_res), 8);
				if (!sub_res)
					panic("%s: Failed to allocate %zu bytes align=0x%x\n",
					      __func__, sizeof(*sub_res), 8);
				*sub_res = *std_res;
				sub_res->end = res->end;
				std_res->start = res->end + 1;
				request_resource(res, sub_res);
			} else {
				request_resource(res, std_res);
			}
		}
	}
#ifdef CONFIG_CRASH_DUMP
	/*
	 * Re-add removed crash kernel memory as reserved memory. This makes
	 * sure it will be mapped with the identity mapping and struct pages
	 * will be created, so it can be resized later on.
	 * However add it later since the crash kernel resource should not be
	 * part of the System RAM resource.
	 */
	if (crashk_res.end) {
		memblock_add_node(crashk_res.start, resource_size(&crashk_res),
				  0, MEMBLOCK_NONE);
		memblock_reserve(crashk_res.start, resource_size(&crashk_res));
		insert_resource(&iomem_resource, &crashk_res);
	}
#endif
}

static void __init setup_memory_end(void)
{
	memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size);
	max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
	pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
}

#ifdef CONFIG_CRASH_DUMP

/*
 * When kdump is enabled, we have to ensure that no memory from the area
 * [0 - crashkernel memory size] is set offline - it will be exchanged with
 * the crashkernel memory region when kdump is triggered. The crashkernel
 * memory region can never get offlined (pages are unmovable).
 */
static int kdump_mem_notifier(struct notifier_block *nb,
			      unsigned long action, void *data)
{
	struct memory_notify *arg = data;

	if (action != MEM_GOING_OFFLINE)
		return NOTIFY_OK;
	if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
		return NOTIFY_BAD;
	return NOTIFY_OK;
}

static struct notifier_block kdump_mem_nb = {
	.notifier_call = kdump_mem_notifier,
};

#endif

/*
 * Reserve memory for kdump kernel to be loaded with kexec
 */
static void __init reserve_crashkernel(void)
{
#ifdef CONFIG_CRASH_DUMP
	unsigned long long crash_base, crash_size;
	phys_addr_t low, high;
	int rc;

	rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
			       &crash_base);

	crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
	crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
	if (rc || crash_size == 0)
		return;

	if (memblock.memory.regions[0].size < crash_size) {
		pr_info("crashkernel reservation failed: %s\n",
			"first memory chunk must be at least crashkernel size");
		return;
	}

	low = crash_base ?: oldmem_data.start;
	high = low + crash_size;
	if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
		/* The crashkernel fits into OLDMEM, reuse OLDMEM */
		crash_base = low;
	} else {
		/* Find suitable area in free memory */
		low = max_t(unsigned long, crash_size, sclp.hsa_size);
		high = crash_base ? crash_base + crash_size : ULONG_MAX;

		if (crash_base && crash_base < low) {
			pr_info("crashkernel reservation failed: %s\n",
				"crash_base too low");
			return;
		}
		low = crash_base ?: low;
		crash_base = memblock_phys_alloc_range(crash_size,
						       KEXEC_CRASH_MEM_ALIGN,
						       low, high);
	}

	if (!crash_base) {
		pr_info("crashkernel reservation failed: %s\n",
			"no suitable area found");
		return;
	}

	if (register_memory_notifier(&kdump_mem_nb)) {
		memblock_phys_free(crash_base, crash_size);
		return;
	}

	if (!oldmem_data.start && MACHINE_IS_VM)
		diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
	crashk_res.start = crash_base;
	crashk_res.end = crash_base + crash_size - 1;
	memblock_remove(crash_base, crash_size);
	pr_info("Reserving %lluMB of memory at %lluMB "
		"for crashkernel (System RAM: %luMB)\n",
		crash_size >> 20, crash_base >> 20,
		(unsigned long)memblock.memory.total_size >> 20);
	os_info_crashkernel_add(crash_base, crash_size);
#endif
}

/*
 * Reserve the initrd from being used by memblock
 */
static void __init reserve_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	if (!initrd_data.start || !initrd_data.size)
		return;
	initrd_start = (unsigned long)__va(initrd_data.start);
	initrd_end = initrd_start + initrd_data.size;
	memblock_reserve(initrd_data.start, initrd_data.size);
#endif
}

/*
 * Reserve the memory area used to pass the certificate lists
 */
static void __init reserve_certificate_list(void)
{
	if (ipl_cert_list_addr)
		memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
}

static void __init reserve_mem_detect_info(void)
{
	unsigned long start, size;

	get_mem_detect_reserved(&start, &size);
	if (size)
		memblock_reserve(start, size);
}

static void __init free_mem_detect_info(void)
{
	unsigned long start, size;

	get_mem_detect_reserved(&start, &size);
	if (size)
		memblock_phys_free(start, size);
}

static const char * __init get_mem_info_source(void)
{
	switch (mem_detect.info_source) {
	case MEM_DETECT_SCLP_STOR_INFO:
		return "sclp storage info";
	case MEM_DETECT_DIAG260:
		return "diag260";
	case MEM_DETECT_SCLP_READ_INFO:
		return "sclp read info";
	case MEM_DETECT_BIN_SEARCH:
		return "binary search";
	}
	return "none";
}

static void __init memblock_add_mem_detect_info(void)
{
	unsigned long start, end;
	int i;

	pr_debug("physmem info source: %s (%hhd)\n",
		 get_mem_info_source(), mem_detect.info_source);
	/* keep memblock lists close to the kernel */
	memblock_set_bottom_up(true);
	for_each_mem_detect_block(i, &start, &end) {
		memblock_add(start, end - start);
		memblock_physmem_add(start, end - start);
	}
	memblock_set_bottom_up(false);
	memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
}

/*
 * Check for initrd being in usable memory
 */
static void __init check_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_data.start && initrd_data.size &&
	    !memblock_is_region_memory(initrd_data.start, initrd_data.size)) {
		pr_err("The initial RAM disk does not fit into the memory\n");
		memblock_phys_free(initrd_data.start, initrd_data.size);
		initrd_start = initrd_end = 0;
	}
#endif
}

/*
 * Reserve memory used for lowcore/command line/kernel image.
 */
static void __init reserve_kernel(void)
{
	memblock_reserve(0, STARTUP_NORMAL_OFFSET);
	memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
	memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
	memblock_reserve(__amode31_base, __eamode31 - __samode31);
	memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
	memblock_reserve(__pa(_stext), _end - _stext);
}

static void __init setup_memory(void)
{
	phys_addr_t start, end;
	u64 i;

	/*
	 * Init storage key for present memory
	 */
	for_each_mem_range(i, &start, &end)
		storage_key_init_range(start, end);

	psw_set_key(PAGE_DEFAULT_KEY);
}

static void __init relocate_amode31_section(void)
{
	unsigned long amode31_size = __eamode31 - __samode31;
	long amode31_offset = __amode31_base - __samode31;
	long *ptr;

	pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);

	/* Move original AMODE31 section to the new one */
	memmove((void *)__amode31_base, (void *)__samode31, amode31_size);
	/* Zero out the old AMODE31 section to catch invalid accesses within it */
	memset((void *)__samode31, 0, amode31_size);

	/* Update all AMODE31 region references */
	for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
		*ptr += amode31_offset;
}

/* This must be called after AMODE31 relocation */
static void __init setup_cr(void)
{
	union ctlreg2 cr2;
	union ctlreg5 cr5;
	union ctlreg15 cr15;

	__ctl_duct[1] = (unsigned long)__ctl_aste;
	__ctl_duct[2] = (unsigned long)__ctl_aste;
	__ctl_duct[4] = (unsigned long)__ctl_duald;

	/* Update control registers CR2, CR5 and CR15 */
	__ctl_store(cr2.val, 2, 2);
	__ctl_store(cr5.val, 5, 5);
	__ctl_store(cr15.val, 15, 15);
	cr2.ducto = (unsigned long)__ctl_duct >> 6;
	cr5.pasteo = (unsigned long)__ctl_duct >> 6;
	cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
	__ctl_load(cr2.val, 2, 2);
	__ctl_load(cr5.val, 5, 5);
	__ctl_load(cr15.val, 15, 15);
}

/*
 * Add system information as device randomness
 */
static void __init setup_randomness(void)
{
	struct sysinfo_3_2_2 *vmms;

	vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
	if (!vmms)
		panic("Failed to allocate memory for sysinfo structure\n");
	if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
		add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
	memblock_free(vmms, PAGE_SIZE);

	if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
		static_branch_enable(&s390_arch_random_available);
}

/*
 * Find the correct size for the task_struct. This depends on
 * the size of the struct fpu at the end of the thread_struct
 * which is embedded in the task_struct.
 */
static void __init setup_task_size(void)
{
	int task_size = sizeof(struct task_struct);

	if (!MACHINE_HAS_VX) {
		task_size -= sizeof(__vector128) * __NUM_VXRS;
		task_size += sizeof(freg_t) * __NUM_FPRS;
	}
	arch_task_struct_size = task_size;
}

/*
 * Issue diagnose 318 to set the control program name and
 * version codes.
 */
static void __init setup_control_program_code(void)
{
	union diag318_info diag318_info = {
		.cpnc = CPNC_LINUX,
		.cpvc = 0,
	};

	if (!sclp.has_diag318)
		return;

	diag_stat_inc(DIAG_STAT_X318);
	asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
}

/*
 * Print the component list from the IPL report
 */
static void __init log_component_list(void)
{
	struct ipl_rb_component_entry *ptr, *end;
	char *str;

	if (!early_ipl_comp_list_addr)
		return;
	if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
		pr_info("Linux is running with Secure-IPL enabled\n");
	else
		pr_info("Linux is running with Secure-IPL disabled\n");
	ptr = (void *) early_ipl_comp_list_addr;
	end = (void *) ptr + early_ipl_comp_list_size;
	pr_info("The IPL report contains the following components:\n");
	while (ptr < end) {
		if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
			if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
				str = "signed, verified";
			else
				str = "signed, verification failed";
		} else {
			str = "not signed";
		}
		pr_info("%016llx - %016llx (%s)\n",
			ptr->addr, ptr->addr + ptr->len, str);
		ptr++;
	}
}

/*
 * Setup function called from init/main.c just after the banner
 * was printed.
 */

void __init setup_arch(char **cmdline_p)
{
        /*
         * print what head.S has found out about the machine
         */
	if (MACHINE_IS_VM)
		pr_info("Linux is running as a z/VM "
			"guest operating system in 64-bit mode\n");
	else if (MACHINE_IS_KVM)
		pr_info("Linux is running under KVM in 64-bit mode\n");
	else if (MACHINE_IS_LPAR)
		pr_info("Linux is running natively in 64-bit mode\n");
	else
		pr_info("Linux is running as a guest in 64-bit mode\n");

	log_component_list();

	/* Have one command line that is parsed and saved in /proc/cmdline */
	/* boot_command_line has been already set up in early.c */
	*cmdline_p = boot_command_line;

        ROOT_DEV = Root_RAM0;

	setup_initial_init_mm(_text, _etext, _edata, _end);

	if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
		nospec_auto_detect();

	jump_label_init();
	parse_early_param();
#ifdef CONFIG_CRASH_DUMP
	/* Deactivate elfcorehdr= kernel parameter */
	elfcorehdr_addr = ELFCORE_ADDR_MAX;
#endif

	os_info_init();
	setup_ipl();
	setup_task_size();
	setup_control_program_code();

	/* Do some memory reservations *before* memory is added to memblock */
	reserve_kernel();
	reserve_initrd();
	reserve_certificate_list();
	reserve_mem_detect_info();
	memblock_set_current_limit(ident_map_size);
	memblock_allow_resize();

	/* Get information about *all* installed memory */
	memblock_add_mem_detect_info();

	free_mem_detect_info();
	setup_memory_end();
	memblock_dump_all();
	setup_memory();

	relocate_amode31_section();
	setup_cr();
	setup_uv();
	dma_contiguous_reserve(ident_map_size);
	vmcp_cma_reserve();
	if (MACHINE_HAS_EDAT2)
		hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);

	check_initrd();
	reserve_crashkernel();
#ifdef CONFIG_CRASH_DUMP
	/*
	 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
	 * Therefore CPU and device initialization should be done afterwards.
	 */
	smp_save_dump_secondary_cpus();
#endif

	setup_resources();
	setup_lowcore_dat_off();
	smp_fill_possible_mask();
	cpu_detect_mhz_feature();
        cpu_init();
	numa_setup();
	smp_detect_cpus();
	topology_init_early();

	if (test_facility(193))
		static_branch_enable(&cpu_has_bear);

	/*
	 * Create kernel page tables and switch to virtual addressing.
	 */
        paging_init();
	memcpy_real_init();
	/*
	 * After paging_init created the kernel page table, the new PSWs
	 * in lowcore can now run with DAT enabled.
	 */
	setup_lowcore_dat_on();
#ifdef CONFIG_CRASH_DUMP
	smp_save_dump_ipl_cpu();
#endif

        /* Setup default console */
	conmode_default();
	set_preferred_console();

	apply_alternative_instructions();
	if (IS_ENABLED(CONFIG_EXPOLINE))
		nospec_init_branches();

	/* Setup zfcp/nvme dump support */
	setup_zfcpdump();

	/* Add system specific data to the random pool */
	setup_randomness();
}