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15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-contiguous.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52
53#include <asm/boot_data.h>
54#include <asm/ipl.h>
55#include <asm/facility.h>
56#include <asm/smp.h>
57#include <asm/mmu_context.h>
58#include <asm/cpcmd.h>
59#include <asm/lowcore.h>
60#include <asm/nmi.h>
61#include <asm/irq.h>
62#include <asm/page.h>
63#include <asm/ptrace.h>
64#include <asm/sections.h>
65#include <asm/ebcdic.h>
66#include <asm/diag.h>
67#include <asm/os_info.h>
68#include <asm/sclp.h>
69#include <asm/stacktrace.h>
70#include <asm/sysinfo.h>
71#include <asm/numa.h>
72#include <asm/alternative.h>
73#include <asm/nospec-branch.h>
74#include <asm/mem_detect.h>
75#include <asm/uv.h>
76#include "entry.h"
77
78
79
80
81unsigned int console_mode = 0;
82EXPORT_SYMBOL(console_mode);
83
84unsigned int console_devno = -1;
85EXPORT_SYMBOL(console_devno);
86
87unsigned int console_irq = -1;
88EXPORT_SYMBOL(console_irq);
89
90unsigned long elf_hwcap __read_mostly = 0;
91char elf_platform[ELF_PLATFORM_SIZE];
92
93unsigned long int_hwcap = 0;
94
95#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
96int __bootdata_preserved(prot_virt_guest);
97#endif
98
99int __bootdata(noexec_disabled);
100int __bootdata(memory_end_set);
101unsigned long __bootdata(memory_end);
102unsigned long __bootdata(max_physmem_end);
103struct mem_detect_info __bootdata(mem_detect);
104
105struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
106struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
107unsigned long __bootdata_preserved(__swsusp_reset_dma);
108unsigned long __bootdata_preserved(__stext_dma);
109unsigned long __bootdata_preserved(__etext_dma);
110unsigned long __bootdata_preserved(__sdma);
111unsigned long __bootdata_preserved(__edma);
112unsigned long __bootdata_preserved(__kaslr_offset);
113
114unsigned long VMALLOC_START;
115EXPORT_SYMBOL(VMALLOC_START);
116
117unsigned long VMALLOC_END;
118EXPORT_SYMBOL(VMALLOC_END);
119
120struct page *vmemmap;
121EXPORT_SYMBOL(vmemmap);
122
123unsigned long MODULES_VADDR;
124unsigned long MODULES_END;
125
126
127struct lowcore *lowcore_ptr[NR_CPUS];
128EXPORT_SYMBOL(lowcore_ptr);
129
130
131
132
133
134
135
136#include <asm/setup.h>
137
138
139
140
141
142static int __init condev_setup(char *str)
143{
144 int vdev;
145
146 vdev = simple_strtoul(str, &str, 0);
147 if (vdev >= 0 && vdev < 65536) {
148 console_devno = vdev;
149 console_irq = -1;
150 }
151 return 1;
152}
153
154__setup("condev=", condev_setup);
155
156static void __init set_preferred_console(void)
157{
158 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
159 add_preferred_console("ttyS", 0, NULL);
160 else if (CONSOLE_IS_3270)
161 add_preferred_console("tty3270", 0, NULL);
162 else if (CONSOLE_IS_VT220)
163 add_preferred_console("ttyS", 1, NULL);
164 else if (CONSOLE_IS_HVC)
165 add_preferred_console("hvc", 0, NULL);
166}
167
168static int __init conmode_setup(char *str)
169{
170#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
171 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
172 SET_CONSOLE_SCLP;
173#endif
174#if defined(CONFIG_TN3215_CONSOLE)
175 if (strncmp(str, "3215", 5) == 0)
176 SET_CONSOLE_3215;
177#endif
178#if defined(CONFIG_TN3270_CONSOLE)
179 if (strncmp(str, "3270", 5) == 0)
180 SET_CONSOLE_3270;
181#endif
182 set_preferred_console();
183 return 1;
184}
185
186__setup("conmode=", conmode_setup);
187
188static void __init conmode_default(void)
189{
190 char query_buffer[1024];
191 char *ptr;
192
193 if (MACHINE_IS_VM) {
194 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
196 ptr = strstr(query_buffer, "SUBCHANNEL =");
197 console_irq = simple_strtoul(ptr + 13, NULL, 16);
198 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
199 ptr = strstr(query_buffer, "CONMODE");
200
201
202
203
204
205
206
207 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
208 if (ptr == NULL) {
209#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 SET_CONSOLE_SCLP;
211#endif
212 return;
213 }
214 if (strncmp(ptr + 8, "3270", 4) == 0) {
215#if defined(CONFIG_TN3270_CONSOLE)
216 SET_CONSOLE_3270;
217#elif defined(CONFIG_TN3215_CONSOLE)
218 SET_CONSOLE_3215;
219#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
220 SET_CONSOLE_SCLP;
221#endif
222 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
223#if defined(CONFIG_TN3215_CONSOLE)
224 SET_CONSOLE_3215;
225#elif defined(CONFIG_TN3270_CONSOLE)
226 SET_CONSOLE_3270;
227#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 }
231 } else if (MACHINE_IS_KVM) {
232 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
233 SET_CONSOLE_VT220;
234 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
235 SET_CONSOLE_SCLP;
236 else
237 SET_CONSOLE_HVC;
238 } else {
239#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
240 SET_CONSOLE_SCLP;
241#endif
242 }
243 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
244 conswitchp = &dummy_con;
245}
246
247#ifdef CONFIG_CRASH_DUMP
248static void __init setup_zfcpdump(void)
249{
250 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
251 return;
252 if (OLDMEM_BASE)
253 return;
254 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
255 console_loglevel = 2;
256}
257#else
258static inline void setup_zfcpdump(void) {}
259#endif
260
261
262
263
264
265
266void machine_restart(char *command)
267{
268 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
269
270
271
272
273 console_unblank();
274 _machine_restart(command);
275}
276
277void machine_halt(void)
278{
279 if (!in_interrupt() || oops_in_progress)
280
281
282
283
284 console_unblank();
285 _machine_halt();
286}
287
288void machine_power_off(void)
289{
290 if (!in_interrupt() || oops_in_progress)
291
292
293
294
295 console_unblank();
296 _machine_power_off();
297}
298
299
300
301
302void (*pm_power_off)(void) = machine_power_off;
303EXPORT_SYMBOL_GPL(pm_power_off);
304
305static int __init parse_vmalloc(char *arg)
306{
307 if (!arg)
308 return -EINVAL;
309 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
310 return 0;
311}
312early_param("vmalloc", parse_vmalloc);
313
314void *restart_stack __section(.data);
315
316unsigned long stack_alloc(void)
317{
318#ifdef CONFIG_VMAP_STACK
319 return (unsigned long)
320 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
321 VMALLOC_START, VMALLOC_END,
322 THREADINFO_GFP,
323 PAGE_KERNEL, 0, NUMA_NO_NODE,
324 __builtin_return_address(0));
325#else
326 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
327#endif
328}
329
330void stack_free(unsigned long stack)
331{
332#ifdef CONFIG_VMAP_STACK
333 vfree((void *) stack);
334#else
335 free_pages(stack, THREAD_SIZE_ORDER);
336#endif
337}
338
339int __init arch_early_irq_init(void)
340{
341 unsigned long stack;
342
343 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
344 if (!stack)
345 panic("Couldn't allocate async stack");
346 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
347 return 0;
348}
349
350static int __init async_stack_realloc(void)
351{
352 unsigned long old, new;
353
354 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
355 new = stack_alloc();
356 if (!new)
357 panic("Couldn't allocate async stack");
358 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
359 free_pages(old, THREAD_SIZE_ORDER);
360 return 0;
361}
362early_initcall(async_stack_realloc);
363
364void __init arch_call_rest_init(void)
365{
366 struct stack_frame *frame;
367 unsigned long stack;
368
369 stack = stack_alloc();
370 if (!stack)
371 panic("Couldn't allocate kernel stack");
372 current->stack = (void *) stack;
373#ifdef CONFIG_VMAP_STACK
374 current->stack_vm_area = (void *) stack;
375#endif
376 set_task_stack_end_magic(current);
377 stack += STACK_INIT_OFFSET;
378 S390_lowcore.kernel_stack = stack;
379 frame = (struct stack_frame *) stack;
380 memset(frame, 0, sizeof(*frame));
381
382 asm volatile(
383 " la 15,0(%[_frame])\n"
384 " jg rest_init\n"
385 : : [_frame] "a" (frame));
386}
387
388static void __init setup_lowcore_dat_off(void)
389{
390 struct lowcore *lc;
391
392
393
394
395 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
396 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
397 if (!lc)
398 panic("%s: Failed to allocate %zu bytes align=%zx\n",
399 __func__, sizeof(*lc), sizeof(*lc));
400
401 lc->restart_psw.mask = PSW_KERNEL_BITS;
402 lc->restart_psw.addr = (unsigned long) restart_int_handler;
403 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
404 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
405 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
406 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
407 lc->svc_new_psw.addr = (unsigned long) system_call;
408 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
409 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
410 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
411 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
412 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
413 lc->io_new_psw.addr = (unsigned long) io_int_handler;
414 lc->clock_comparator = clock_comparator_max;
415 lc->nodat_stack = ((unsigned long) &init_thread_union)
416 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
417 lc->current_task = (unsigned long)&init_task;
418 lc->lpp = LPP_MAGIC;
419 lc->machine_flags = S390_lowcore.machine_flags;
420 lc->preempt_count = S390_lowcore.preempt_count;
421 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
422 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
423 sizeof(lc->stfle_fac_list));
424 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
425 sizeof(lc->alt_stfle_fac_list));
426 nmi_alloc_boot_cpu(lc);
427 vdso_alloc_boot_cpu(lc);
428 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
429 lc->async_enter_timer = S390_lowcore.async_enter_timer;
430 lc->exit_timer = S390_lowcore.exit_timer;
431 lc->user_timer = S390_lowcore.user_timer;
432 lc->system_timer = S390_lowcore.system_timer;
433 lc->steal_timer = S390_lowcore.steal_timer;
434 lc->last_update_timer = S390_lowcore.last_update_timer;
435 lc->last_update_clock = S390_lowcore.last_update_clock;
436
437
438
439
440
441 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
442 if (!restart_stack)
443 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
444 __func__, THREAD_SIZE, THREAD_SIZE);
445 restart_stack += STACK_INIT_OFFSET;
446
447
448
449
450
451
452 lc->restart_stack = (unsigned long) restart_stack;
453 lc->restart_fn = (unsigned long) do_restart;
454 lc->restart_data = 0;
455 lc->restart_source = -1UL;
456
457
458 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
459 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
460 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
461 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
462 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
463
464 lc->spinlock_lockval = arch_spin_lockval(0);
465 lc->spinlock_index = 0;
466 arch_spin_lock_setup(0);
467 lc->br_r1_trampoline = 0x07f1;
468
469 set_prefix((u32)(unsigned long) lc);
470 lowcore_ptr[0] = lc;
471}
472
473static void __init setup_lowcore_dat_on(void)
474{
475 __ctl_clear_bit(0, 28);
476 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
477 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
478 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
479 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
480 __ctl_set_bit(0, 28);
481}
482
483static struct resource code_resource = {
484 .name = "Kernel code",
485 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
486};
487
488static struct resource data_resource = {
489 .name = "Kernel data",
490 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
491};
492
493static struct resource bss_resource = {
494 .name = "Kernel bss",
495 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
496};
497
498static struct resource __initdata *standard_resources[] = {
499 &code_resource,
500 &data_resource,
501 &bss_resource,
502};
503
504static void __init setup_resources(void)
505{
506 struct resource *res, *std_res, *sub_res;
507 struct memblock_region *reg;
508 int j;
509
510 code_resource.start = (unsigned long) _text;
511 code_resource.end = (unsigned long) _etext - 1;
512 data_resource.start = (unsigned long) _etext;
513 data_resource.end = (unsigned long) _edata - 1;
514 bss_resource.start = (unsigned long) __bss_start;
515 bss_resource.end = (unsigned long) __bss_stop - 1;
516
517 for_each_memblock(memory, reg) {
518 res = memblock_alloc(sizeof(*res), 8);
519 if (!res)
520 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
521 __func__, sizeof(*res), 8);
522 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
523
524 res->name = "System RAM";
525 res->start = reg->base;
526 res->end = reg->base + reg->size - 1;
527 request_resource(&iomem_resource, res);
528
529 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
530 std_res = standard_resources[j];
531 if (std_res->start < res->start ||
532 std_res->start > res->end)
533 continue;
534 if (std_res->end > res->end) {
535 sub_res = memblock_alloc(sizeof(*sub_res), 8);
536 if (!sub_res)
537 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
538 __func__, sizeof(*sub_res), 8);
539 *sub_res = *std_res;
540 sub_res->end = res->end;
541 std_res->start = res->end + 1;
542 request_resource(res, sub_res);
543 } else {
544 request_resource(res, std_res);
545 }
546 }
547 }
548#ifdef CONFIG_CRASH_DUMP
549
550
551
552
553
554
555
556 if (crashk_res.end) {
557 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
558 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
559 insert_resource(&iomem_resource, &crashk_res);
560 }
561#endif
562}
563
564static void __init setup_memory_end(void)
565{
566 unsigned long vmax, vmalloc_size, tmp;
567
568
569 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
570 if (IS_ENABLED(CONFIG_KASAN)) {
571 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
572 ? _REGION1_SIZE
573 : _REGION2_SIZE;
574 } else {
575 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
576 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
577 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
578 vmax = _REGION2_SIZE;
579 else
580 vmax = _REGION1_SIZE;
581 }
582
583
584 MODULES_END = vmax;
585 MODULES_VADDR = MODULES_END - MODULES_LEN;
586 VMALLOC_END = MODULES_VADDR;
587 VMALLOC_START = VMALLOC_END - vmalloc_size;
588
589
590 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
591
592 tmp = SECTION_ALIGN_UP(tmp);
593 tmp = VMALLOC_START - tmp * sizeof(struct page);
594 tmp &= ~((vmax >> 11) - 1);
595 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
596 vmemmap = (struct page *) tmp;
597
598
599 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
600#ifdef CONFIG_KASAN
601
602 memory_end = min(memory_end, KASAN_SHADOW_START);
603 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
604#endif
605 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
606 memblock_remove(memory_end, ULONG_MAX);
607
608 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
609}
610
611#ifdef CONFIG_CRASH_DUMP
612
613
614
615
616
617
618static int kdump_mem_notifier(struct notifier_block *nb,
619 unsigned long action, void *data)
620{
621 struct memory_notify *arg = data;
622
623 if (action != MEM_GOING_OFFLINE)
624 return NOTIFY_OK;
625 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
626 return NOTIFY_BAD;
627 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
628 return NOTIFY_OK;
629 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
630 return NOTIFY_OK;
631 return NOTIFY_BAD;
632}
633
634static struct notifier_block kdump_mem_nb = {
635 .notifier_call = kdump_mem_notifier,
636};
637
638#endif
639
640
641
642
643static void reserve_memory_end(void)
644{
645 if (memory_end_set)
646 memblock_reserve(memory_end, ULONG_MAX);
647}
648
649
650
651
652static void reserve_oldmem(void)
653{
654#ifdef CONFIG_CRASH_DUMP
655 if (OLDMEM_BASE)
656
657 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
658#endif
659}
660
661
662
663
664static void remove_oldmem(void)
665{
666#ifdef CONFIG_CRASH_DUMP
667 if (OLDMEM_BASE)
668
669 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
670#endif
671}
672
673
674
675
676static void __init reserve_crashkernel(void)
677{
678#ifdef CONFIG_CRASH_DUMP
679 unsigned long long crash_base, crash_size;
680 phys_addr_t low, high;
681 int rc;
682
683 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
684 &crash_base);
685
686 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
687 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
688 if (rc || crash_size == 0)
689 return;
690
691 if (memblock.memory.regions[0].size < crash_size) {
692 pr_info("crashkernel reservation failed: %s\n",
693 "first memory chunk must be at least crashkernel size");
694 return;
695 }
696
697 low = crash_base ?: OLDMEM_BASE;
698 high = low + crash_size;
699 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
700
701 crash_base = low;
702 } else {
703
704 low = max_t(unsigned long, crash_size, sclp.hsa_size);
705 high = crash_base ? crash_base + crash_size : ULONG_MAX;
706
707 if (crash_base && crash_base < low) {
708 pr_info("crashkernel reservation failed: %s\n",
709 "crash_base too low");
710 return;
711 }
712 low = crash_base ?: low;
713 crash_base = memblock_find_in_range(low, high, crash_size,
714 KEXEC_CRASH_MEM_ALIGN);
715 }
716
717 if (!crash_base) {
718 pr_info("crashkernel reservation failed: %s\n",
719 "no suitable area found");
720 return;
721 }
722
723 if (register_memory_notifier(&kdump_mem_nb))
724 return;
725
726 if (!OLDMEM_BASE && MACHINE_IS_VM)
727 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
728 crashk_res.start = crash_base;
729 crashk_res.end = crash_base + crash_size - 1;
730 memblock_remove(crash_base, crash_size);
731 pr_info("Reserving %lluMB of memory at %lluMB "
732 "for crashkernel (System RAM: %luMB)\n",
733 crash_size >> 20, crash_base >> 20,
734 (unsigned long)memblock.memory.total_size >> 20);
735 os_info_crashkernel_add(crash_base, crash_size);
736#endif
737}
738
739
740
741
742static void __init reserve_initrd(void)
743{
744#ifdef CONFIG_BLK_DEV_INITRD
745 if (!INITRD_START || !INITRD_SIZE)
746 return;
747 initrd_start = INITRD_START;
748 initrd_end = initrd_start + INITRD_SIZE;
749 memblock_reserve(INITRD_START, INITRD_SIZE);
750#endif
751}
752
753
754
755
756static void __init reserve_certificate_list(void)
757{
758 if (ipl_cert_list_addr)
759 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
760}
761
762static void __init reserve_mem_detect_info(void)
763{
764 unsigned long start, size;
765
766 get_mem_detect_reserved(&start, &size);
767 if (size)
768 memblock_reserve(start, size);
769}
770
771static void __init free_mem_detect_info(void)
772{
773 unsigned long start, size;
774
775 get_mem_detect_reserved(&start, &size);
776 if (size)
777 memblock_free(start, size);
778}
779
780static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
781{
782 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
783 start, start + size - 1);
784 memblock_add_range(&memblock.memory, start, size, 0, 0);
785 memblock_add_range(&memblock.physmem, start, size, 0, 0);
786}
787
788static const char * __init get_mem_info_source(void)
789{
790 switch (mem_detect.info_source) {
791 case MEM_DETECT_SCLP_STOR_INFO:
792 return "sclp storage info";
793 case MEM_DETECT_DIAG260:
794 return "diag260";
795 case MEM_DETECT_SCLP_READ_INFO:
796 return "sclp read info";
797 case MEM_DETECT_BIN_SEARCH:
798 return "binary search";
799 }
800 return "none";
801}
802
803static void __init memblock_add_mem_detect_info(void)
804{
805 unsigned long start, end;
806 int i;
807
808 memblock_dbg("physmem info source: %s (%hhd)\n",
809 get_mem_info_source(), mem_detect.info_source);
810
811 memblock_set_bottom_up(true);
812 for_each_mem_detect_block(i, &start, &end)
813 memblock_physmem_add(start, end - start);
814 memblock_set_bottom_up(false);
815 memblock_dump_all();
816}
817
818
819
820
821static void __init check_initrd(void)
822{
823#ifdef CONFIG_BLK_DEV_INITRD
824 if (INITRD_START && INITRD_SIZE &&
825 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
826 pr_err("The initial RAM disk does not fit into the memory\n");
827 memblock_free(INITRD_START, INITRD_SIZE);
828 initrd_start = initrd_end = 0;
829 }
830#endif
831}
832
833
834
835
836static void __init reserve_kernel(void)
837{
838 unsigned long start_pfn = PFN_UP(__pa(_end));
839
840 memblock_reserve(0, HEAD_END);
841 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
842 - (unsigned long)_stext);
843 memblock_reserve(__sdma, __edma - __sdma);
844}
845
846static void __init setup_memory(void)
847{
848 struct memblock_region *reg;
849
850
851
852
853 for_each_memblock(memory, reg) {
854 storage_key_init_range(reg->base, reg->base + reg->size);
855 }
856 psw_set_key(PAGE_DEFAULT_KEY);
857
858
859 memblock_enforce_memory_limit(memblock_end_of_DRAM());
860}
861
862
863
864
865static int __init setup_hwcaps(void)
866{
867 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
868 struct cpuid cpu_id;
869 int i;
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889 for (i = 0; i < 6; i++)
890 if (test_facility(stfl_bits[i]))
891 elf_hwcap |= 1UL << i;
892
893 if (test_facility(22) && test_facility(30))
894 elf_hwcap |= HWCAP_S390_ETF3EH;
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
910 elf_hwcap |= HWCAP_S390_DFP;
911
912
913
914
915 if (MACHINE_HAS_EDAT1)
916 elf_hwcap |= HWCAP_S390_HPAGE;
917
918
919
920
921
922 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
923
924
925
926
927 if (MACHINE_HAS_TE)
928 elf_hwcap |= HWCAP_S390_TE;
929
930
931
932
933
934
935 if (MACHINE_HAS_VX) {
936 elf_hwcap |= HWCAP_S390_VXRS;
937 if (test_facility(134))
938 elf_hwcap |= HWCAP_S390_VXRS_EXT;
939 if (test_facility(135))
940 elf_hwcap |= HWCAP_S390_VXRS_BCD;
941 if (test_facility(148))
942 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
943 if (test_facility(152))
944 elf_hwcap |= HWCAP_S390_VXRS_PDE;
945 }
946 if (test_facility(150))
947 elf_hwcap |= HWCAP_S390_SORT;
948 if (test_facility(151))
949 elf_hwcap |= HWCAP_S390_DFLT;
950
951
952
953
954 if (MACHINE_HAS_GS)
955 elf_hwcap |= HWCAP_S390_GS;
956
957 get_cpu_id(&cpu_id);
958 add_device_randomness(&cpu_id, sizeof(cpu_id));
959 switch (cpu_id.machine) {
960 case 0x2064:
961 case 0x2066:
962 default:
963 strcpy(elf_platform, "z900");
964 break;
965 case 0x2084:
966 case 0x2086:
967 strcpy(elf_platform, "z990");
968 break;
969 case 0x2094:
970 case 0x2096:
971 strcpy(elf_platform, "z9-109");
972 break;
973 case 0x2097:
974 case 0x2098:
975 strcpy(elf_platform, "z10");
976 break;
977 case 0x2817:
978 case 0x2818:
979 strcpy(elf_platform, "z196");
980 break;
981 case 0x2827:
982 case 0x2828:
983 strcpy(elf_platform, "zEC12");
984 break;
985 case 0x2964:
986 case 0x2965:
987 strcpy(elf_platform, "z13");
988 break;
989 case 0x3906:
990 case 0x3907:
991 strcpy(elf_platform, "z14");
992 break;
993 }
994
995
996
997
998 if (sclp.has_sief2)
999 int_hwcap |= HWCAP_INT_SIE;
1000
1001 return 0;
1002}
1003arch_initcall(setup_hwcaps);
1004
1005
1006
1007
1008static void __init setup_randomness(void)
1009{
1010 struct sysinfo_3_2_2 *vmms;
1011
1012 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
1013 PAGE_SIZE);
1014 if (!vmms)
1015 panic("Failed to allocate memory for sysinfo structure\n");
1016
1017 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
1018 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
1019 memblock_free((unsigned long) vmms, PAGE_SIZE);
1020}
1021
1022
1023
1024
1025
1026
1027static void __init setup_task_size(void)
1028{
1029 int task_size = sizeof(struct task_struct);
1030
1031 if (!MACHINE_HAS_VX) {
1032 task_size -= sizeof(__vector128) * __NUM_VXRS;
1033 task_size += sizeof(freg_t) * __NUM_FPRS;
1034 }
1035 arch_task_struct_size = task_size;
1036}
1037
1038
1039
1040
1041
1042static void __init setup_control_program_code(void)
1043{
1044 union diag318_info diag318_info = {
1045 .cpnc = CPNC_LINUX,
1046 .cpvc_linux = 0,
1047 .cpvc_distro = {0},
1048 };
1049
1050 if (!sclp.has_diag318)
1051 return;
1052
1053 diag_stat_inc(DIAG_STAT_X318);
1054 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1055}
1056
1057
1058
1059
1060static void __init log_component_list(void)
1061{
1062 struct ipl_rb_component_entry *ptr, *end;
1063 char *str;
1064
1065 if (!early_ipl_comp_list_addr)
1066 return;
1067 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR)
1068 pr_info("Linux is running with Secure-IPL enabled\n");
1069 else
1070 pr_info("Linux is running with Secure-IPL disabled\n");
1071 ptr = (void *) early_ipl_comp_list_addr;
1072 end = (void *) ptr + early_ipl_comp_list_size;
1073 pr_info("The IPL report contains the following components:\n");
1074 while (ptr < end) {
1075 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1076 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1077 str = "signed, verified";
1078 else
1079 str = "signed, verification failed";
1080 } else {
1081 str = "not signed";
1082 }
1083 pr_info("%016llx - %016llx (%s)\n",
1084 ptr->addr, ptr->addr + ptr->len, str);
1085 ptr++;
1086 }
1087}
1088
1089
1090
1091
1092
1093
1094void __init setup_arch(char **cmdline_p)
1095{
1096
1097
1098
1099 if (MACHINE_IS_VM)
1100 pr_info("Linux is running as a z/VM "
1101 "guest operating system in 64-bit mode\n");
1102 else if (MACHINE_IS_KVM)
1103 pr_info("Linux is running under KVM in 64-bit mode\n");
1104 else if (MACHINE_IS_LPAR)
1105 pr_info("Linux is running natively in 64-bit mode\n");
1106 else
1107 pr_info("Linux is running as a guest in 64-bit mode\n");
1108
1109 log_component_list();
1110
1111
1112
1113 *cmdline_p = boot_command_line;
1114
1115 ROOT_DEV = Root_RAM0;
1116
1117 init_mm.start_code = (unsigned long) _text;
1118 init_mm.end_code = (unsigned long) _etext;
1119 init_mm.end_data = (unsigned long) _edata;
1120 init_mm.brk = (unsigned long) _end;
1121
1122 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1123 nospec_auto_detect();
1124
1125 parse_early_param();
1126#ifdef CONFIG_CRASH_DUMP
1127
1128 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1129#endif
1130
1131 os_info_init();
1132 setup_ipl();
1133 setup_task_size();
1134 setup_control_program_code();
1135
1136
1137 reserve_memory_end();
1138 reserve_oldmem();
1139 reserve_kernel();
1140 reserve_initrd();
1141 reserve_certificate_list();
1142 reserve_mem_detect_info();
1143 memblock_allow_resize();
1144
1145
1146 memblock_add_mem_detect_info();
1147
1148 free_mem_detect_info();
1149 remove_oldmem();
1150
1151
1152
1153
1154
1155
1156
1157 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
1158
1159 setup_memory_end();
1160 setup_memory();
1161 dma_contiguous_reserve(memory_end);
1162 vmcp_cma_reserve();
1163
1164 check_initrd();
1165 reserve_crashkernel();
1166#ifdef CONFIG_CRASH_DUMP
1167
1168
1169
1170
1171 smp_save_dump_cpus();
1172#endif
1173
1174 setup_resources();
1175 setup_lowcore_dat_off();
1176 smp_fill_possible_mask();
1177 cpu_detect_mhz_feature();
1178 cpu_init();
1179 numa_setup();
1180 smp_detect_cpus();
1181 topology_init_early();
1182
1183
1184
1185
1186 paging_init();
1187
1188
1189
1190
1191
1192 setup_lowcore_dat_on();
1193
1194
1195 conmode_default();
1196 set_preferred_console();
1197
1198 apply_alternative_instructions();
1199 if (IS_ENABLED(CONFIG_EXPOLINE))
1200 nospec_init_branches();
1201
1202
1203 setup_zfcpdump();
1204
1205
1206 setup_randomness();
1207}
1208