1
2
3
4
5
6
7
8
9
10
11
12
13
14
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-map-ops.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#include <linux/hugetlb.h>
53
54#include <asm/boot_data.h>
55#include <asm/ipl.h>
56#include <asm/facility.h>
57#include <asm/smp.h>
58#include <asm/mmu_context.h>
59#include <asm/cpcmd.h>
60#include <asm/lowcore.h>
61#include <asm/nmi.h>
62#include <asm/irq.h>
63#include <asm/page.h>
64#include <asm/ptrace.h>
65#include <asm/sections.h>
66#include <asm/ebcdic.h>
67#include <asm/diag.h>
68#include <asm/os_info.h>
69#include <asm/sclp.h>
70#include <asm/stacktrace.h>
71#include <asm/sysinfo.h>
72#include <asm/numa.h>
73#include <asm/alternative.h>
74#include <asm/nospec-branch.h>
75#include <asm/mem_detect.h>
76#include <asm/uv.h>
77#include <asm/asm-offsets.h>
78#include "entry.h"
79
80
81
82
83unsigned int console_mode = 0;
84EXPORT_SYMBOL(console_mode);
85
86unsigned int console_devno = -1;
87EXPORT_SYMBOL(console_devno);
88
89unsigned int console_irq = -1;
90EXPORT_SYMBOL(console_irq);
91
92unsigned long elf_hwcap __read_mostly = 0;
93char elf_platform[ELF_PLATFORM_SIZE];
94
95unsigned long int_hwcap = 0;
96
97int __bootdata(noexec_disabled);
98unsigned long __bootdata(ident_map_size);
99struct mem_detect_info __bootdata(mem_detect);
100
101struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
102struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
103unsigned long __bootdata_preserved(__stext_dma);
104unsigned long __bootdata_preserved(__etext_dma);
105unsigned long __bootdata_preserved(__sdma);
106unsigned long __bootdata_preserved(__edma);
107unsigned long __bootdata_preserved(__kaslr_offset);
108unsigned int __bootdata_preserved(zlib_dfltcc_support);
109EXPORT_SYMBOL(zlib_dfltcc_support);
110u64 __bootdata_preserved(stfle_fac_list[16]);
111EXPORT_SYMBOL(stfle_fac_list);
112u64 __bootdata_preserved(alt_stfle_fac_list[16]);
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);
122unsigned long vmemmap_size;
123
124unsigned long MODULES_VADDR;
125unsigned long MODULES_END;
126
127
128struct lowcore *lowcore_ptr[NR_CPUS];
129EXPORT_SYMBOL(lowcore_ptr);
130
131
132
133
134
135unsigned long mio_wb_bit_mask __ro_after_init;
136
137
138
139
140
141
142
143#include <asm/setup.h>
144
145
146
147
148
149static int __init condev_setup(char *str)
150{
151 int vdev;
152
153 vdev = simple_strtoul(str, &str, 0);
154 if (vdev >= 0 && vdev < 65536) {
155 console_devno = vdev;
156 console_irq = -1;
157 }
158 return 1;
159}
160
161__setup("condev=", condev_setup);
162
163static void __init set_preferred_console(void)
164{
165 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
166 add_preferred_console("ttyS", 0, NULL);
167 else if (CONSOLE_IS_3270)
168 add_preferred_console("tty3270", 0, NULL);
169 else if (CONSOLE_IS_VT220)
170 add_preferred_console("ttysclp", 0, NULL);
171 else if (CONSOLE_IS_HVC)
172 add_preferred_console("hvc", 0, NULL);
173}
174
175static int __init conmode_setup(char *str)
176{
177#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
178 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
179 SET_CONSOLE_SCLP;
180#endif
181#if defined(CONFIG_TN3215_CONSOLE)
182 if (!strcmp(str, "3215"))
183 SET_CONSOLE_3215;
184#endif
185#if defined(CONFIG_TN3270_CONSOLE)
186 if (!strcmp(str, "3270"))
187 SET_CONSOLE_3270;
188#endif
189 set_preferred_console();
190 return 1;
191}
192
193__setup("conmode=", conmode_setup);
194
195static void __init conmode_default(void)
196{
197 char query_buffer[1024];
198 char *ptr;
199
200 if (MACHINE_IS_VM) {
201 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
202 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
203 ptr = strstr(query_buffer, "SUBCHANNEL =");
204 console_irq = simple_strtoul(ptr + 13, NULL, 16);
205 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
206 ptr = strstr(query_buffer, "CONMODE");
207
208
209
210
211
212
213
214 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
215 if (ptr == NULL) {
216#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
217 SET_CONSOLE_SCLP;
218#endif
219 return;
220 }
221 if (str_has_prefix(ptr + 8, "3270")) {
222#if defined(CONFIG_TN3270_CONSOLE)
223 SET_CONSOLE_3270;
224#elif defined(CONFIG_TN3215_CONSOLE)
225 SET_CONSOLE_3215;
226#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
227 SET_CONSOLE_SCLP;
228#endif
229 } else if (str_has_prefix(ptr + 8, "3215")) {
230#if defined(CONFIG_TN3215_CONSOLE)
231 SET_CONSOLE_3215;
232#elif defined(CONFIG_TN3270_CONSOLE)
233 SET_CONSOLE_3270;
234#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
235 SET_CONSOLE_SCLP;
236#endif
237 }
238 } else if (MACHINE_IS_KVM) {
239 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
240 SET_CONSOLE_VT220;
241 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
242 SET_CONSOLE_SCLP;
243 else
244 SET_CONSOLE_HVC;
245 } else {
246#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
247 SET_CONSOLE_SCLP;
248#endif
249 }
250}
251
252#ifdef CONFIG_CRASH_DUMP
253static void __init setup_zfcpdump(void)
254{
255 if (!is_ipl_type_dump())
256 return;
257 if (OLDMEM_BASE)
258 return;
259 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
260 console_loglevel = 2;
261}
262#else
263static inline void setup_zfcpdump(void) {}
264#endif
265
266
267
268
269
270
271void machine_restart(char *command)
272{
273 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
274
275
276
277
278 console_unblank();
279 _machine_restart(command);
280}
281
282void machine_halt(void)
283{
284 if (!in_interrupt() || oops_in_progress)
285
286
287
288
289 console_unblank();
290 _machine_halt();
291}
292
293void machine_power_off(void)
294{
295 if (!in_interrupt() || oops_in_progress)
296
297
298
299
300 console_unblank();
301 _machine_power_off();
302}
303
304
305
306
307void (*pm_power_off)(void) = machine_power_off;
308EXPORT_SYMBOL_GPL(pm_power_off);
309
310void *restart_stack;
311
312unsigned long stack_alloc(void)
313{
314#ifdef CONFIG_VMAP_STACK
315 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE,
316 THREADINFO_GFP, NUMA_NO_NODE,
317 __builtin_return_address(0));
318#else
319 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
320#endif
321}
322
323void stack_free(unsigned long stack)
324{
325#ifdef CONFIG_VMAP_STACK
326 vfree((void *) stack);
327#else
328 free_pages(stack, THREAD_SIZE_ORDER);
329#endif
330}
331
332int __init arch_early_irq_init(void)
333{
334 unsigned long stack;
335
336 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
337 if (!stack)
338 panic("Couldn't allocate async stack");
339 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
340 return 0;
341}
342
343void __init arch_call_rest_init(void)
344{
345 unsigned long stack;
346
347 stack = stack_alloc();
348 if (!stack)
349 panic("Couldn't allocate kernel stack");
350 current->stack = (void *) stack;
351#ifdef CONFIG_VMAP_STACK
352 current->stack_vm_area = (void *) stack;
353#endif
354 set_task_stack_end_magic(current);
355 stack += STACK_INIT_OFFSET;
356 S390_lowcore.kernel_stack = stack;
357 call_on_stack_noreturn(rest_init, stack);
358}
359
360static void __init setup_lowcore_dat_off(void)
361{
362 unsigned long int_psw_mask = PSW_KERNEL_BITS;
363 unsigned long mcck_stack;
364 struct lowcore *lc;
365
366 if (IS_ENABLED(CONFIG_KASAN))
367 int_psw_mask |= PSW_MASK_DAT;
368
369
370
371
372 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
373 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
374 if (!lc)
375 panic("%s: Failed to allocate %zu bytes align=%zx\n",
376 __func__, sizeof(*lc), sizeof(*lc));
377
378 lc->restart_psw.mask = PSW_KERNEL_BITS;
379 lc->restart_psw.addr = (unsigned long) restart_int_handler;
380 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
381 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
382 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
383 lc->svc_new_psw.addr = (unsigned long) system_call;
384 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
385 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
386 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
387 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
388 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
389 lc->io_new_psw.addr = (unsigned long) io_int_handler;
390 lc->clock_comparator = clock_comparator_max;
391 lc->nodat_stack = ((unsigned long) &init_thread_union)
392 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
393 lc->current_task = (unsigned long)&init_task;
394 lc->lpp = LPP_MAGIC;
395 lc->machine_flags = S390_lowcore.machine_flags;
396 lc->preempt_count = S390_lowcore.preempt_count;
397 nmi_alloc_boot_cpu(lc);
398 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
399 lc->exit_timer = S390_lowcore.exit_timer;
400 lc->user_timer = S390_lowcore.user_timer;
401 lc->system_timer = S390_lowcore.system_timer;
402 lc->steal_timer = S390_lowcore.steal_timer;
403 lc->last_update_timer = S390_lowcore.last_update_timer;
404 lc->last_update_clock = S390_lowcore.last_update_clock;
405
406
407
408
409
410 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
411 if (!restart_stack)
412 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
413 __func__, THREAD_SIZE, THREAD_SIZE);
414 restart_stack += STACK_INIT_OFFSET;
415
416
417
418
419
420
421 lc->restart_stack = (unsigned long) restart_stack;
422 lc->restart_fn = (unsigned long) do_restart;
423 lc->restart_data = 0;
424 lc->restart_source = -1UL;
425
426 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
427 if (!mcck_stack)
428 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
429 __func__, THREAD_SIZE, THREAD_SIZE);
430 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
431
432
433 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
434 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
435 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
436 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
437 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
438
439 lc->spinlock_lockval = arch_spin_lockval(0);
440 lc->spinlock_index = 0;
441 arch_spin_lock_setup(0);
442 lc->br_r1_trampoline = 0x07f1;
443 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
444 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
445 lc->preempt_count = PREEMPT_DISABLED;
446
447 set_prefix((u32)(unsigned long) lc);
448 lowcore_ptr[0] = lc;
449}
450
451static void __init setup_lowcore_dat_on(void)
452{
453 __ctl_clear_bit(0, 28);
454 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
455 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
456 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
457 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
458 __ctl_set_bit(0, 28);
459}
460
461static struct resource code_resource = {
462 .name = "Kernel code",
463 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
464};
465
466static struct resource data_resource = {
467 .name = "Kernel data",
468 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
469};
470
471static struct resource bss_resource = {
472 .name = "Kernel bss",
473 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
474};
475
476static struct resource __initdata *standard_resources[] = {
477 &code_resource,
478 &data_resource,
479 &bss_resource,
480};
481
482static void __init setup_resources(void)
483{
484 struct resource *res, *std_res, *sub_res;
485 phys_addr_t start, end;
486 int j;
487 u64 i;
488
489 code_resource.start = (unsigned long) _text;
490 code_resource.end = (unsigned long) _etext - 1;
491 data_resource.start = (unsigned long) _etext;
492 data_resource.end = (unsigned long) _edata - 1;
493 bss_resource.start = (unsigned long) __bss_start;
494 bss_resource.end = (unsigned long) __bss_stop - 1;
495
496 for_each_mem_range(i, &start, &end) {
497 res = memblock_alloc(sizeof(*res), 8);
498 if (!res)
499 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
500 __func__, sizeof(*res), 8);
501 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
502
503 res->name = "System RAM";
504 res->start = start;
505
506
507
508
509
510 res->end = end - 1;
511 request_resource(&iomem_resource, res);
512
513 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
514 std_res = standard_resources[j];
515 if (std_res->start < res->start ||
516 std_res->start > res->end)
517 continue;
518 if (std_res->end > res->end) {
519 sub_res = memblock_alloc(sizeof(*sub_res), 8);
520 if (!sub_res)
521 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
522 __func__, sizeof(*sub_res), 8);
523 *sub_res = *std_res;
524 sub_res->end = res->end;
525 std_res->start = res->end + 1;
526 request_resource(res, sub_res);
527 } else {
528 request_resource(res, std_res);
529 }
530 }
531 }
532#ifdef CONFIG_CRASH_DUMP
533
534
535
536
537
538
539
540 if (crashk_res.end) {
541 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
542 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
543 insert_resource(&iomem_resource, &crashk_res);
544 }
545#endif
546}
547
548static void __init setup_memory_end(void)
549{
550 memblock_remove(ident_map_size, ULONG_MAX);
551 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
552 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
553}
554
555#ifdef CONFIG_CRASH_DUMP
556
557
558
559
560
561
562
563static int kdump_mem_notifier(struct notifier_block *nb,
564 unsigned long action, void *data)
565{
566 struct memory_notify *arg = data;
567
568 if (action != MEM_GOING_OFFLINE)
569 return NOTIFY_OK;
570 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
571 return NOTIFY_BAD;
572 return NOTIFY_OK;
573}
574
575static struct notifier_block kdump_mem_nb = {
576 .notifier_call = kdump_mem_notifier,
577};
578
579#endif
580
581
582
583
584static void __init reserve_above_ident_map(void)
585{
586 memblock_reserve(ident_map_size, ULONG_MAX);
587}
588
589
590
591
592static void __init reserve_crashkernel(void)
593{
594#ifdef CONFIG_CRASH_DUMP
595 unsigned long long crash_base, crash_size;
596 phys_addr_t low, high;
597 int rc;
598
599 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
600 &crash_base);
601
602 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
603 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
604 if (rc || crash_size == 0)
605 return;
606
607 if (memblock.memory.regions[0].size < crash_size) {
608 pr_info("crashkernel reservation failed: %s\n",
609 "first memory chunk must be at least crashkernel size");
610 return;
611 }
612
613 low = crash_base ?: OLDMEM_BASE;
614 high = low + crash_size;
615 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
616
617 crash_base = low;
618 } else {
619
620 low = max_t(unsigned long, crash_size, sclp.hsa_size);
621 high = crash_base ? crash_base + crash_size : ULONG_MAX;
622
623 if (crash_base && crash_base < low) {
624 pr_info("crashkernel reservation failed: %s\n",
625 "crash_base too low");
626 return;
627 }
628 low = crash_base ?: low;
629 crash_base = memblock_find_in_range(low, high, crash_size,
630 KEXEC_CRASH_MEM_ALIGN);
631 }
632
633 if (!crash_base) {
634 pr_info("crashkernel reservation failed: %s\n",
635 "no suitable area found");
636 return;
637 }
638
639 if (register_memory_notifier(&kdump_mem_nb))
640 return;
641
642 if (!OLDMEM_BASE && MACHINE_IS_VM)
643 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
644 crashk_res.start = crash_base;
645 crashk_res.end = crash_base + crash_size - 1;
646 memblock_remove(crash_base, crash_size);
647 pr_info("Reserving %lluMB of memory at %lluMB "
648 "for crashkernel (System RAM: %luMB)\n",
649 crash_size >> 20, crash_base >> 20,
650 (unsigned long)memblock.memory.total_size >> 20);
651 os_info_crashkernel_add(crash_base, crash_size);
652#endif
653}
654
655
656
657
658static void __init reserve_initrd(void)
659{
660#ifdef CONFIG_BLK_DEV_INITRD
661 if (!INITRD_START || !INITRD_SIZE)
662 return;
663 initrd_start = INITRD_START;
664 initrd_end = initrd_start + INITRD_SIZE;
665 memblock_reserve(INITRD_START, INITRD_SIZE);
666#endif
667}
668
669
670
671
672static void __init reserve_certificate_list(void)
673{
674 if (ipl_cert_list_addr)
675 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
676}
677
678static void __init reserve_mem_detect_info(void)
679{
680 unsigned long start, size;
681
682 get_mem_detect_reserved(&start, &size);
683 if (size)
684 memblock_reserve(start, size);
685}
686
687static void __init free_mem_detect_info(void)
688{
689 unsigned long start, size;
690
691 get_mem_detect_reserved(&start, &size);
692 if (size)
693 memblock_free(start, size);
694}
695
696static const char * __init get_mem_info_source(void)
697{
698 switch (mem_detect.info_source) {
699 case MEM_DETECT_SCLP_STOR_INFO:
700 return "sclp storage info";
701 case MEM_DETECT_DIAG260:
702 return "diag260";
703 case MEM_DETECT_SCLP_READ_INFO:
704 return "sclp read info";
705 case MEM_DETECT_BIN_SEARCH:
706 return "binary search";
707 }
708 return "none";
709}
710
711static void __init memblock_add_mem_detect_info(void)
712{
713 unsigned long start, end;
714 int i;
715
716 pr_debug("physmem info source: %s (%hhd)\n",
717 get_mem_info_source(), mem_detect.info_source);
718
719 memblock_set_bottom_up(true);
720 for_each_mem_detect_block(i, &start, &end) {
721 memblock_add(start, end - start);
722 memblock_physmem_add(start, end - start);
723 }
724 memblock_set_bottom_up(false);
725 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
726 memblock_dump_all();
727}
728
729
730
731
732static void __init check_initrd(void)
733{
734#ifdef CONFIG_BLK_DEV_INITRD
735 if (INITRD_START && INITRD_SIZE &&
736 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
737 pr_err("The initial RAM disk does not fit into the memory\n");
738 memblock_free(INITRD_START, INITRD_SIZE);
739 initrd_start = initrd_end = 0;
740 }
741#endif
742}
743
744
745
746
747static void __init reserve_kernel(void)
748{
749 unsigned long start_pfn = PFN_UP(__pa(_end));
750
751 memblock_reserve(0, HEAD_END);
752 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
753 - (unsigned long)_stext);
754 memblock_reserve(__sdma, __edma - __sdma);
755}
756
757static void __init setup_memory(void)
758{
759 phys_addr_t start, end;
760 u64 i;
761
762
763
764
765 for_each_mem_range(i, &start, &end)
766 storage_key_init_range(start, end);
767
768 psw_set_key(PAGE_DEFAULT_KEY);
769
770
771 memblock_enforce_memory_limit(memblock_end_of_DRAM());
772}
773
774
775
776
777static int __init setup_hwcaps(void)
778{
779 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
780 struct cpuid cpu_id;
781 int i;
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801 for (i = 0; i < 6; i++)
802 if (test_facility(stfl_bits[i]))
803 elf_hwcap |= 1UL << i;
804
805 if (test_facility(22) && test_facility(30))
806 elf_hwcap |= HWCAP_S390_ETF3EH;
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
822 elf_hwcap |= HWCAP_S390_DFP;
823
824
825
826
827 if (MACHINE_HAS_EDAT1)
828 elf_hwcap |= HWCAP_S390_HPAGE;
829
830
831
832
833
834 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
835
836
837
838
839 if (MACHINE_HAS_TE)
840 elf_hwcap |= HWCAP_S390_TE;
841
842
843
844
845
846
847 if (MACHINE_HAS_VX) {
848 elf_hwcap |= HWCAP_S390_VXRS;
849 if (test_facility(134))
850 elf_hwcap |= HWCAP_S390_VXRS_BCD;
851 if (test_facility(135))
852 elf_hwcap |= HWCAP_S390_VXRS_EXT;
853 if (test_facility(148))
854 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
855 if (test_facility(152))
856 elf_hwcap |= HWCAP_S390_VXRS_PDE;
857 }
858 if (test_facility(150))
859 elf_hwcap |= HWCAP_S390_SORT;
860 if (test_facility(151))
861 elf_hwcap |= HWCAP_S390_DFLT;
862
863
864
865
866 if (MACHINE_HAS_GS)
867 elf_hwcap |= HWCAP_S390_GS;
868
869 get_cpu_id(&cpu_id);
870 add_device_randomness(&cpu_id, sizeof(cpu_id));
871 switch (cpu_id.machine) {
872 case 0x2064:
873 case 0x2066:
874 default:
875 strcpy(elf_platform, "z900");
876 break;
877 case 0x2084:
878 case 0x2086:
879 strcpy(elf_platform, "z990");
880 break;
881 case 0x2094:
882 case 0x2096:
883 strcpy(elf_platform, "z9-109");
884 break;
885 case 0x2097:
886 case 0x2098:
887 strcpy(elf_platform, "z10");
888 break;
889 case 0x2817:
890 case 0x2818:
891 strcpy(elf_platform, "z196");
892 break;
893 case 0x2827:
894 case 0x2828:
895 strcpy(elf_platform, "zEC12");
896 break;
897 case 0x2964:
898 case 0x2965:
899 strcpy(elf_platform, "z13");
900 break;
901 case 0x3906:
902 case 0x3907:
903 strcpy(elf_platform, "z14");
904 break;
905 case 0x8561:
906 case 0x8562:
907 strcpy(elf_platform, "z15");
908 break;
909 }
910
911
912
913
914 if (sclp.has_sief2)
915 int_hwcap |= HWCAP_INT_SIE;
916
917 return 0;
918}
919arch_initcall(setup_hwcaps);
920
921
922
923
924static void __init setup_randomness(void)
925{
926 struct sysinfo_3_2_2 *vmms;
927
928 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
929 PAGE_SIZE);
930 if (!vmms)
931 panic("Failed to allocate memory for sysinfo structure\n");
932
933 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
934 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
935 memblock_free((unsigned long) vmms, PAGE_SIZE);
936}
937
938
939
940
941
942
943static void __init setup_task_size(void)
944{
945 int task_size = sizeof(struct task_struct);
946
947 if (!MACHINE_HAS_VX) {
948 task_size -= sizeof(__vector128) * __NUM_VXRS;
949 task_size += sizeof(freg_t) * __NUM_FPRS;
950 }
951 arch_task_struct_size = task_size;
952}
953
954
955
956
957
958static void __init setup_control_program_code(void)
959{
960 union diag318_info diag318_info = {
961 .cpnc = CPNC_LINUX,
962 .cpvc = 0,
963 };
964
965 if (!sclp.has_diag318)
966 return;
967
968 diag_stat_inc(DIAG_STAT_X318);
969 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
970}
971
972
973
974
975static void __init log_component_list(void)
976{
977 struct ipl_rb_component_entry *ptr, *end;
978 char *str;
979
980 if (!early_ipl_comp_list_addr)
981 return;
982 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
983 pr_info("Linux is running with Secure-IPL enabled\n");
984 else
985 pr_info("Linux is running with Secure-IPL disabled\n");
986 ptr = (void *) early_ipl_comp_list_addr;
987 end = (void *) ptr + early_ipl_comp_list_size;
988 pr_info("The IPL report contains the following components:\n");
989 while (ptr < end) {
990 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
991 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
992 str = "signed, verified";
993 else
994 str = "signed, verification failed";
995 } else {
996 str = "not signed";
997 }
998 pr_info("%016llx - %016llx (%s)\n",
999 ptr->addr, ptr->addr + ptr->len, str);
1000 ptr++;
1001 }
1002}
1003
1004
1005
1006
1007
1008
1009void __init setup_arch(char **cmdline_p)
1010{
1011
1012
1013
1014 if (MACHINE_IS_VM)
1015 pr_info("Linux is running as a z/VM "
1016 "guest operating system in 64-bit mode\n");
1017 else if (MACHINE_IS_KVM)
1018 pr_info("Linux is running under KVM in 64-bit mode\n");
1019 else if (MACHINE_IS_LPAR)
1020 pr_info("Linux is running natively in 64-bit mode\n");
1021 else
1022 pr_info("Linux is running as a guest in 64-bit mode\n");
1023
1024 log_component_list();
1025
1026
1027
1028 *cmdline_p = boot_command_line;
1029
1030 ROOT_DEV = Root_RAM0;
1031
1032 setup_initial_init_mm(_text, _etext, _edata, _end);
1033
1034 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1035 nospec_auto_detect();
1036
1037 jump_label_init();
1038 parse_early_param();
1039#ifdef CONFIG_CRASH_DUMP
1040
1041 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1042#endif
1043
1044 os_info_init();
1045 setup_ipl();
1046 setup_task_size();
1047 setup_control_program_code();
1048
1049
1050 reserve_above_ident_map();
1051 reserve_kernel();
1052 reserve_initrd();
1053 reserve_certificate_list();
1054 reserve_mem_detect_info();
1055 memblock_allow_resize();
1056
1057
1058 memblock_add_mem_detect_info();
1059
1060 free_mem_detect_info();
1061
1062 setup_uv();
1063 setup_memory_end();
1064 setup_memory();
1065 dma_contiguous_reserve(ident_map_size);
1066 vmcp_cma_reserve();
1067 if (MACHINE_HAS_EDAT2)
1068 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1069
1070 check_initrd();
1071 reserve_crashkernel();
1072#ifdef CONFIG_CRASH_DUMP
1073
1074
1075
1076
1077 smp_save_dump_cpus();
1078#endif
1079
1080 setup_resources();
1081 setup_lowcore_dat_off();
1082 smp_fill_possible_mask();
1083 cpu_detect_mhz_feature();
1084 cpu_init();
1085 numa_setup();
1086 smp_detect_cpus();
1087 topology_init_early();
1088
1089
1090
1091
1092 paging_init();
1093
1094
1095
1096
1097
1098 setup_lowcore_dat_on();
1099
1100
1101 conmode_default();
1102 set_preferred_console();
1103
1104 apply_alternative_instructions();
1105 if (IS_ENABLED(CONFIG_EXPOLINE))
1106 nospec_init_branches();
1107
1108
1109 setup_zfcpdump();
1110
1111
1112 setup_randomness();
1113}
1114