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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
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-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 * Machine setup..
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(vmalloc_size);
103unsigned long __bootdata(max_physmem_end);
104struct mem_detect_info __bootdata(mem_detect);
105
106struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
107struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
108unsigned long __bootdata_preserved(__swsusp_reset_dma);
109unsigned long __bootdata_preserved(__stext_dma);
110unsigned long __bootdata_preserved(__etext_dma);
111unsigned long __bootdata_preserved(__sdma);
112unsigned long __bootdata_preserved(__edma);
113unsigned long __bootdata_preserved(__kaslr_offset);
114
115unsigned long VMALLOC_START;
116EXPORT_SYMBOL(VMALLOC_START);
117
118unsigned long VMALLOC_END;
119EXPORT_SYMBOL(VMALLOC_END);
120
121struct page *vmemmap;
122EXPORT_SYMBOL(vmemmap);
123
124unsigned long MODULES_VADDR;
125unsigned long MODULES_END;
126
127/* An array with a pointer to the lowcore of every CPU. */
128struct lowcore *lowcore_ptr[NR_CPUS];
129EXPORT_SYMBOL(lowcore_ptr);
130
131/*
132 * This is set up by the setup-routine at boot-time
133 * for S390 need to find out, what we have to setup
134 * using address 0x10400 ...
135 */
136
137#include <asm/setup.h>
138
139/*
140 * condev= and conmode= setup parameter.
141 */
142
143static int __init condev_setup(char *str)
144{
145 int vdev;
146
147 vdev = simple_strtoul(str, &str, 0);
148 if (vdev >= 0 && vdev < 65536) {
149 console_devno = vdev;
150 console_irq = -1;
151 }
152 return 1;
153}
154
155__setup("condev=", condev_setup);
156
157static void __init set_preferred_console(void)
158{
159 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
160 add_preferred_console("ttyS", 0, NULL);
161 else if (CONSOLE_IS_3270)
162 add_preferred_console("tty3270", 0, NULL);
163 else if (CONSOLE_IS_VT220)
164 add_preferred_console("ttyS", 1, NULL);
165 else if (CONSOLE_IS_HVC)
166 add_preferred_console("hvc", 0, NULL);
167}
168
169static int __init conmode_setup(char *str)
170{
171#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
172 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
173 SET_CONSOLE_SCLP;
174#endif
175#if defined(CONFIG_TN3215_CONSOLE)
176 if (!strcmp(str, "3215"))
177 SET_CONSOLE_3215;
178#endif
179#if defined(CONFIG_TN3270_CONSOLE)
180 if (!strcmp(str, "3270"))
181 SET_CONSOLE_3270;
182#endif
183 set_preferred_console();
184 return 1;
185}
186
187__setup("conmode=", conmode_setup);
188
189static void __init conmode_default(void)
190{
191 char query_buffer[1024];
192 char *ptr;
193
194 if (MACHINE_IS_VM) {
195 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
196 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
197 ptr = strstr(query_buffer, "SUBCHANNEL =");
198 console_irq = simple_strtoul(ptr + 13, NULL, 16);
199 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
200 ptr = strstr(query_buffer, "CONMODE");
201 /*
202 * Set the conmode to 3215 so that the device recognition
203 * will set the cu_type of the console to 3215. If the
204 * conmode is 3270 and we don't set it back then both
205 * 3215 and the 3270 driver will try to access the console
206 * device (3215 as console and 3270 as normal tty).
207 */
208 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
209 if (ptr == NULL) {
210#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
211 SET_CONSOLE_SCLP;
212#endif
213 return;
214 }
215 if (str_has_prefix(ptr + 8, "3270")) {
216#if defined(CONFIG_TN3270_CONSOLE)
217 SET_CONSOLE_3270;
218#elif defined(CONFIG_TN3215_CONSOLE)
219 SET_CONSOLE_3215;
220#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
221 SET_CONSOLE_SCLP;
222#endif
223 } else if (str_has_prefix(ptr + 8, "3215")) {
224#if defined(CONFIG_TN3215_CONSOLE)
225 SET_CONSOLE_3215;
226#elif defined(CONFIG_TN3270_CONSOLE)
227 SET_CONSOLE_3270;
228#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
229 SET_CONSOLE_SCLP;
230#endif
231 }
232 } else if (MACHINE_IS_KVM) {
233 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
234 SET_CONSOLE_VT220;
235 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
236 SET_CONSOLE_SCLP;
237 else
238 SET_CONSOLE_HVC;
239 } else {
240#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
241 SET_CONSOLE_SCLP;
242#endif
243 }
244 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
245 conswitchp = &dummy_con;
246}
247
248#ifdef CONFIG_CRASH_DUMP
249static void __init setup_zfcpdump(void)
250{
251 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
252 return;
253 if (OLDMEM_BASE)
254 return;
255 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
256 console_loglevel = 2;
257}
258#else
259static inline void setup_zfcpdump(void) {}
260#endif /* CONFIG_CRASH_DUMP */
261
262 /*
263 * Reboot, halt and power_off stubs. They just call _machine_restart,
264 * _machine_halt or _machine_power_off.
265 */
266
267void machine_restart(char *command)
268{
269 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
270 /*
271 * Only unblank the console if we are called in enabled
272 * context or a bust_spinlocks cleared the way for us.
273 */
274 console_unblank();
275 _machine_restart(command);
276}
277
278void machine_halt(void)
279{
280 if (!in_interrupt() || oops_in_progress)
281 /*
282 * Only unblank the console if we are called in enabled
283 * context or a bust_spinlocks cleared the way for us.
284 */
285 console_unblank();
286 _machine_halt();
287}
288
289void machine_power_off(void)
290{
291 if (!in_interrupt() || oops_in_progress)
292 /*
293 * Only unblank the console if we are called in enabled
294 * context or a bust_spinlocks cleared the way for us.
295 */
296 console_unblank();
297 _machine_power_off();
298}
299
300/*
301 * Dummy power off function.
302 */
303void (*pm_power_off)(void) = machine_power_off;
304EXPORT_SYMBOL_GPL(pm_power_off);
305
306void *restart_stack __section(.data);
307
308unsigned long stack_alloc(void)
309{
310#ifdef CONFIG_VMAP_STACK
311 return (unsigned long)
312 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
313 VMALLOC_START, VMALLOC_END,
314 THREADINFO_GFP,
315 PAGE_KERNEL, 0, NUMA_NO_NODE,
316 __builtin_return_address(0));
317#else
318 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
319#endif
320}
321
322void stack_free(unsigned long stack)
323{
324#ifdef CONFIG_VMAP_STACK
325 vfree((void *) stack);
326#else
327 free_pages(stack, THREAD_SIZE_ORDER);
328#endif
329}
330
331int __init arch_early_irq_init(void)
332{
333 unsigned long stack;
334
335 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
336 if (!stack)
337 panic("Couldn't allocate async stack");
338 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
339 return 0;
340}
341
342static int __init async_stack_realloc(void)
343{
344 unsigned long old, new;
345
346 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
347 new = stack_alloc();
348 if (!new)
349 panic("Couldn't allocate async stack");
350 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
351 free_pages(old, THREAD_SIZE_ORDER);
352 return 0;
353}
354early_initcall(async_stack_realloc);
355
356void __init arch_call_rest_init(void)
357{
358 struct stack_frame *frame;
359 unsigned long stack;
360
361 stack = stack_alloc();
362 if (!stack)
363 panic("Couldn't allocate kernel stack");
364 current->stack = (void *) stack;
365#ifdef CONFIG_VMAP_STACK
366 current->stack_vm_area = (void *) stack;
367#endif
368 set_task_stack_end_magic(current);
369 stack += STACK_INIT_OFFSET;
370 S390_lowcore.kernel_stack = stack;
371 frame = (struct stack_frame *) stack;
372 memset(frame, 0, sizeof(*frame));
373 /* Branch to rest_init on the new stack, never returns */
374 asm volatile(
375 " la 15,0(%[_frame])\n"
376 " jg rest_init\n"
377 : : [_frame] "a" (frame));
378}
379
380static void __init setup_lowcore_dat_off(void)
381{
382 struct lowcore *lc;
383
384 /*
385 * Setup lowcore for boot cpu
386 */
387 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
388 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
389 if (!lc)
390 panic("%s: Failed to allocate %zu bytes align=%zx\n",
391 __func__, sizeof(*lc), sizeof(*lc));
392
393 lc->restart_psw.mask = PSW_KERNEL_BITS;
394 lc->restart_psw.addr = (unsigned long) restart_int_handler;
395 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
396 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
397 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
398 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
399 lc->svc_new_psw.addr = (unsigned long) system_call;
400 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
401 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
402 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
403 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
404 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
405 lc->io_new_psw.addr = (unsigned long) io_int_handler;
406 lc->clock_comparator = clock_comparator_max;
407 lc->nodat_stack = ((unsigned long) &init_thread_union)
408 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
409 lc->current_task = (unsigned long)&init_task;
410 lc->lpp = LPP_MAGIC;
411 lc->machine_flags = S390_lowcore.machine_flags;
412 lc->preempt_count = S390_lowcore.preempt_count;
413 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
414 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
415 sizeof(lc->stfle_fac_list));
416 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
417 sizeof(lc->alt_stfle_fac_list));
418 nmi_alloc_boot_cpu(lc);
419 vdso_alloc_boot_cpu(lc);
420 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
421 lc->async_enter_timer = S390_lowcore.async_enter_timer;
422 lc->exit_timer = S390_lowcore.exit_timer;
423 lc->user_timer = S390_lowcore.user_timer;
424 lc->system_timer = S390_lowcore.system_timer;
425 lc->steal_timer = S390_lowcore.steal_timer;
426 lc->last_update_timer = S390_lowcore.last_update_timer;
427 lc->last_update_clock = S390_lowcore.last_update_clock;
428
429 /*
430 * Allocate the global restart stack which is the same for
431 * all CPUs in cast *one* of them does a PSW restart.
432 */
433 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
434 if (!restart_stack)
435 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
436 __func__, THREAD_SIZE, THREAD_SIZE);
437 restart_stack += STACK_INIT_OFFSET;
438
439 /*
440 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
441 * restart data to the absolute zero lowcore. This is necessary if
442 * PSW restart is done on an offline CPU that has lowcore zero.
443 */
444 lc->restart_stack = (unsigned long) restart_stack;
445 lc->restart_fn = (unsigned long) do_restart;
446 lc->restart_data = 0;
447 lc->restart_source = -1UL;
448
449 /* Setup absolute zero lowcore */
450 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
451 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
452 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
453 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
454 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
455
456 lc->spinlock_lockval = arch_spin_lockval(0);
457 lc->spinlock_index = 0;
458 arch_spin_lock_setup(0);
459 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
460
461 set_prefix((u32)(unsigned long) lc);
462 lowcore_ptr[0] = lc;
463}
464
465static void __init setup_lowcore_dat_on(void)
466{
467 __ctl_clear_bit(0, 28);
468 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
469 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
470 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
471 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
472 __ctl_set_bit(0, 28);
473}
474
475static struct resource code_resource = {
476 .name = "Kernel code",
477 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
478};
479
480static struct resource data_resource = {
481 .name = "Kernel data",
482 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
483};
484
485static struct resource bss_resource = {
486 .name = "Kernel bss",
487 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
488};
489
490static struct resource __initdata *standard_resources[] = {
491 &code_resource,
492 &data_resource,
493 &bss_resource,
494};
495
496static void __init setup_resources(void)
497{
498 struct resource *res, *std_res, *sub_res;
499 struct memblock_region *reg;
500 int j;
501
502 code_resource.start = (unsigned long) _text;
503 code_resource.end = (unsigned long) _etext - 1;
504 data_resource.start = (unsigned long) _etext;
505 data_resource.end = (unsigned long) _edata - 1;
506 bss_resource.start = (unsigned long) __bss_start;
507 bss_resource.end = (unsigned long) __bss_stop - 1;
508
509 for_each_memblock(memory, reg) {
510 res = memblock_alloc(sizeof(*res), 8);
511 if (!res)
512 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
513 __func__, sizeof(*res), 8);
514 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
515
516 res->name = "System RAM";
517 res->start = reg->base;
518 res->end = reg->base + reg->size - 1;
519 request_resource(&iomem_resource, res);
520
521 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
522 std_res = standard_resources[j];
523 if (std_res->start < res->start ||
524 std_res->start > res->end)
525 continue;
526 if (std_res->end > res->end) {
527 sub_res = memblock_alloc(sizeof(*sub_res), 8);
528 if (!sub_res)
529 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
530 __func__, sizeof(*sub_res), 8);
531 *sub_res = *std_res;
532 sub_res->end = res->end;
533 std_res->start = res->end + 1;
534 request_resource(res, sub_res);
535 } else {
536 request_resource(res, std_res);
537 }
538 }
539 }
540#ifdef CONFIG_CRASH_DUMP
541 /*
542 * Re-add removed crash kernel memory as reserved memory. This makes
543 * sure it will be mapped with the identity mapping and struct pages
544 * will be created, so it can be resized later on.
545 * However add it later since the crash kernel resource should not be
546 * part of the System RAM resource.
547 */
548 if (crashk_res.end) {
549 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
550 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
551 insert_resource(&iomem_resource, &crashk_res);
552 }
553#endif
554}
555
556static void __init setup_memory_end(void)
557{
558 unsigned long vmax, tmp;
559
560 /* Choose kernel address space layout: 3 or 4 levels. */
561 if (IS_ENABLED(CONFIG_KASAN)) {
562 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
563 ? _REGION1_SIZE
564 : _REGION2_SIZE;
565 } else {
566 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
567 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
568 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
569 vmax = _REGION2_SIZE; /* 3-level kernel page table */
570 else
571 vmax = _REGION1_SIZE; /* 4-level kernel page table */
572 }
573
574 /* module area is at the end of the kernel address space. */
575 MODULES_END = vmax;
576 MODULES_VADDR = MODULES_END - MODULES_LEN;
577 VMALLOC_END = MODULES_VADDR;
578 VMALLOC_START = VMALLOC_END - vmalloc_size;
579
580 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
581 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
582 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
583 tmp = SECTION_ALIGN_UP(tmp);
584 tmp = VMALLOC_START - tmp * sizeof(struct page);
585 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
586 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
587 vmemmap = (struct page *) tmp;
588
589 /* Take care that memory_end is set and <= vmemmap */
590 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
591#ifdef CONFIG_KASAN
592 /* fit in kasan shadow memory region between 1:1 and vmemmap */
593 memory_end = min(memory_end, KASAN_SHADOW_START);
594 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
595#endif
596 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
597 memblock_remove(memory_end, ULONG_MAX);
598
599 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
600}
601
602#ifdef CONFIG_CRASH_DUMP
603
604/*
605 * When kdump is enabled, we have to ensure that no memory from
606 * the area [0 - crashkernel memory size] and
607 * [crashk_res.start - crashk_res.end] is set offline.
608 */
609static int kdump_mem_notifier(struct notifier_block *nb,
610 unsigned long action, void *data)
611{
612 struct memory_notify *arg = data;
613
614 if (action != MEM_GOING_OFFLINE)
615 return NOTIFY_OK;
616 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
617 return NOTIFY_BAD;
618 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
619 return NOTIFY_OK;
620 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
621 return NOTIFY_OK;
622 return NOTIFY_BAD;
623}
624
625static struct notifier_block kdump_mem_nb = {
626 .notifier_call = kdump_mem_notifier,
627};
628
629#endif
630
631/*
632 * Make sure that the area behind memory_end is protected
633 */
634static void reserve_memory_end(void)
635{
636 if (memory_end_set)
637 memblock_reserve(memory_end, ULONG_MAX);
638}
639
640/*
641 * Make sure that oldmem, where the dump is stored, is protected
642 */
643static void reserve_oldmem(void)
644{
645#ifdef CONFIG_CRASH_DUMP
646 if (OLDMEM_BASE)
647 /* Forget all memory above the running kdump system */
648 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
649#endif
650}
651
652/*
653 * Make sure that oldmem, where the dump is stored, is protected
654 */
655static void remove_oldmem(void)
656{
657#ifdef CONFIG_CRASH_DUMP
658 if (OLDMEM_BASE)
659 /* Forget all memory above the running kdump system */
660 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
661#endif
662}
663
664/*
665 * Reserve memory for kdump kernel to be loaded with kexec
666 */
667static void __init reserve_crashkernel(void)
668{
669#ifdef CONFIG_CRASH_DUMP
670 unsigned long long crash_base, crash_size;
671 phys_addr_t low, high;
672 int rc;
673
674 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
675 &crash_base);
676
677 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
678 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
679 if (rc || crash_size == 0)
680 return;
681
682 if (memblock.memory.regions[0].size < crash_size) {
683 pr_info("crashkernel reservation failed: %s\n",
684 "first memory chunk must be at least crashkernel size");
685 return;
686 }
687
688 low = crash_base ?: OLDMEM_BASE;
689 high = low + crash_size;
690 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
691 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
692 crash_base = low;
693 } else {
694 /* Find suitable area in free memory */
695 low = max_t(unsigned long, crash_size, sclp.hsa_size);
696 high = crash_base ? crash_base + crash_size : ULONG_MAX;
697
698 if (crash_base && crash_base < low) {
699 pr_info("crashkernel reservation failed: %s\n",
700 "crash_base too low");
701 return;
702 }
703 low = crash_base ?: low;
704 crash_base = memblock_find_in_range(low, high, crash_size,
705 KEXEC_CRASH_MEM_ALIGN);
706 }
707
708 if (!crash_base) {
709 pr_info("crashkernel reservation failed: %s\n",
710 "no suitable area found");
711 return;
712 }
713
714 if (register_memory_notifier(&kdump_mem_nb))
715 return;
716
717 if (!OLDMEM_BASE && MACHINE_IS_VM)
718 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
719 crashk_res.start = crash_base;
720 crashk_res.end = crash_base + crash_size - 1;
721 memblock_remove(crash_base, crash_size);
722 pr_info("Reserving %lluMB of memory at %lluMB "
723 "for crashkernel (System RAM: %luMB)\n",
724 crash_size >> 20, crash_base >> 20,
725 (unsigned long)memblock.memory.total_size >> 20);
726 os_info_crashkernel_add(crash_base, crash_size);
727#endif
728}
729
730/*
731 * Reserve the initrd from being used by memblock
732 */
733static void __init reserve_initrd(void)
734{
735#ifdef CONFIG_BLK_DEV_INITRD
736 if (!INITRD_START || !INITRD_SIZE)
737 return;
738 initrd_start = INITRD_START;
739 initrd_end = initrd_start + INITRD_SIZE;
740 memblock_reserve(INITRD_START, INITRD_SIZE);
741#endif
742}
743
744/*
745 * Reserve the memory area used to pass the certificate lists
746 */
747static void __init reserve_certificate_list(void)
748{
749 if (ipl_cert_list_addr)
750 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
751}
752
753static void __init reserve_mem_detect_info(void)
754{
755 unsigned long start, size;
756
757 get_mem_detect_reserved(&start, &size);
758 if (size)
759 memblock_reserve(start, size);
760}
761
762static void __init free_mem_detect_info(void)
763{
764 unsigned long start, size;
765
766 get_mem_detect_reserved(&start, &size);
767 if (size)
768 memblock_free(start, size);
769}
770
771static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
772{
773 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
774 start, start + size - 1);
775 memblock_add_range(&memblock.memory, start, size, 0, 0);
776 memblock_add_range(&memblock.physmem, start, size, 0, 0);
777}
778
779static const char * __init get_mem_info_source(void)
780{
781 switch (mem_detect.info_source) {
782 case MEM_DETECT_SCLP_STOR_INFO:
783 return "sclp storage info";
784 case MEM_DETECT_DIAG260:
785 return "diag260";
786 case MEM_DETECT_SCLP_READ_INFO:
787 return "sclp read info";
788 case MEM_DETECT_BIN_SEARCH:
789 return "binary search";
790 }
791 return "none";
792}
793
794static void __init memblock_add_mem_detect_info(void)
795{
796 unsigned long start, end;
797 int i;
798
799 memblock_dbg("physmem info source: %s (%hhd)\n",
800 get_mem_info_source(), mem_detect.info_source);
801 /* keep memblock lists close to the kernel */
802 memblock_set_bottom_up(true);
803 for_each_mem_detect_block(i, &start, &end)
804 memblock_physmem_add(start, end - start);
805 memblock_set_bottom_up(false);
806 memblock_dump_all();
807}
808
809/*
810 * Check for initrd being in usable memory
811 */
812static void __init check_initrd(void)
813{
814#ifdef CONFIG_BLK_DEV_INITRD
815 if (INITRD_START && INITRD_SIZE &&
816 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
817 pr_err("The initial RAM disk does not fit into the memory\n");
818 memblock_free(INITRD_START, INITRD_SIZE);
819 initrd_start = initrd_end = 0;
820 }
821#endif
822}
823
824/*
825 * Reserve memory used for lowcore/command line/kernel image.
826 */
827static void __init reserve_kernel(void)
828{
829 unsigned long start_pfn = PFN_UP(__pa(_end));
830
831 memblock_reserve(0, HEAD_END);
832 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
833 - (unsigned long)_stext);
834 memblock_reserve(__sdma, __edma - __sdma);
835}
836
837static void __init setup_memory(void)
838{
839 struct memblock_region *reg;
840
841 /*
842 * Init storage key for present memory
843 */
844 for_each_memblock(memory, reg) {
845 storage_key_init_range(reg->base, reg->base + reg->size);
846 }
847 psw_set_key(PAGE_DEFAULT_KEY);
848
849 /* Only cosmetics */
850 memblock_enforce_memory_limit(memblock_end_of_DRAM());
851}
852
853/*
854 * Setup hardware capabilities.
855 */
856static int __init setup_hwcaps(void)
857{
858 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
859 struct cpuid cpu_id;
860 int i;
861
862 /*
863 * The store facility list bits numbers as found in the principles
864 * of operation are numbered with bit 1UL<<31 as number 0 to
865 * bit 1UL<<0 as number 31.
866 * Bit 0: instructions named N3, "backported" to esa-mode
867 * Bit 2: z/Architecture mode is active
868 * Bit 7: the store-facility-list-extended facility is installed
869 * Bit 17: the message-security assist is installed
870 * Bit 19: the long-displacement facility is installed
871 * Bit 21: the extended-immediate facility is installed
872 * Bit 22: extended-translation facility 3 is installed
873 * Bit 30: extended-translation facility 3 enhancement facility
874 * These get translated to:
875 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
876 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
877 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
878 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
879 */
880 for (i = 0; i < 6; i++)
881 if (test_facility(stfl_bits[i]))
882 elf_hwcap |= 1UL << i;
883
884 if (test_facility(22) && test_facility(30))
885 elf_hwcap |= HWCAP_S390_ETF3EH;
886
887 /*
888 * Check for additional facilities with store-facility-list-extended.
889 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
890 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
891 * as stored by stfl, bits 32-xxx contain additional facilities.
892 * How many facility words are stored depends on the number of
893 * doublewords passed to the instruction. The additional facilities
894 * are:
895 * Bit 42: decimal floating point facility is installed
896 * Bit 44: perform floating point operation facility is installed
897 * translated to:
898 * HWCAP_S390_DFP bit 6 (42 && 44).
899 */
900 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
901 elf_hwcap |= HWCAP_S390_DFP;
902
903 /*
904 * Huge page support HWCAP_S390_HPAGE is bit 7.
905 */
906 if (MACHINE_HAS_EDAT1)
907 elf_hwcap |= HWCAP_S390_HPAGE;
908
909 /*
910 * 64-bit register support for 31-bit processes
911 * HWCAP_S390_HIGH_GPRS is bit 9.
912 */
913 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
914
915 /*
916 * Transactional execution support HWCAP_S390_TE is bit 10.
917 */
918 if (MACHINE_HAS_TE)
919 elf_hwcap |= HWCAP_S390_TE;
920
921 /*
922 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
923 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
924 * instead of facility bit 129.
925 */
926 if (MACHINE_HAS_VX) {
927 elf_hwcap |= HWCAP_S390_VXRS;
928 if (test_facility(134))
929 elf_hwcap |= HWCAP_S390_VXRS_EXT;
930 if (test_facility(135))
931 elf_hwcap |= HWCAP_S390_VXRS_BCD;
932 if (test_facility(148))
933 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
934 if (test_facility(152))
935 elf_hwcap |= HWCAP_S390_VXRS_PDE;
936 }
937 if (test_facility(150))
938 elf_hwcap |= HWCAP_S390_SORT;
939 if (test_facility(151))
940 elf_hwcap |= HWCAP_S390_DFLT;
941
942 /*
943 * Guarded storage support HWCAP_S390_GS is bit 12.
944 */
945 if (MACHINE_HAS_GS)
946 elf_hwcap |= HWCAP_S390_GS;
947
948 get_cpu_id(&cpu_id);
949 add_device_randomness(&cpu_id, sizeof(cpu_id));
950 switch (cpu_id.machine) {
951 case 0x2064:
952 case 0x2066:
953 default: /* Use "z900" as default for 64 bit kernels. */
954 strcpy(elf_platform, "z900");
955 break;
956 case 0x2084:
957 case 0x2086:
958 strcpy(elf_platform, "z990");
959 break;
960 case 0x2094:
961 case 0x2096:
962 strcpy(elf_platform, "z9-109");
963 break;
964 case 0x2097:
965 case 0x2098:
966 strcpy(elf_platform, "z10");
967 break;
968 case 0x2817:
969 case 0x2818:
970 strcpy(elf_platform, "z196");
971 break;
972 case 0x2827:
973 case 0x2828:
974 strcpy(elf_platform, "zEC12");
975 break;
976 case 0x2964:
977 case 0x2965:
978 strcpy(elf_platform, "z13");
979 break;
980 case 0x3906:
981 case 0x3907:
982 strcpy(elf_platform, "z14");
983 break;
984 case 0x8561:
985 case 0x8562:
986 strcpy(elf_platform, "z15");
987 break;
988 }
989
990 /*
991 * Virtualization support HWCAP_INT_SIE is bit 0.
992 */
993 if (sclp.has_sief2)
994 int_hwcap |= HWCAP_INT_SIE;
995
996 return 0;
997}
998arch_initcall(setup_hwcaps);
999
1000/*
1001 * Add system information as device randomness
1002 */
1003static void __init setup_randomness(void)
1004{
1005 struct sysinfo_3_2_2 *vmms;
1006
1007 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
1008 PAGE_SIZE);
1009 if (!vmms)
1010 panic("Failed to allocate memory for sysinfo structure\n");
1011
1012 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
1013 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
1014 memblock_free((unsigned long) vmms, PAGE_SIZE);
1015}
1016
1017/*
1018 * Find the correct size for the task_struct. This depends on
1019 * the size of the struct fpu at the end of the thread_struct
1020 * which is embedded in the task_struct.
1021 */
1022static void __init setup_task_size(void)
1023{
1024 int task_size = sizeof(struct task_struct);
1025
1026 if (!MACHINE_HAS_VX) {
1027 task_size -= sizeof(__vector128) * __NUM_VXRS;
1028 task_size += sizeof(freg_t) * __NUM_FPRS;
1029 }
1030 arch_task_struct_size = task_size;
1031}
1032
1033/*
1034 * Issue diagnose 318 to set the control program name and
1035 * version codes.
1036 */
1037static void __init setup_control_program_code(void)
1038{
1039 union diag318_info diag318_info = {
1040 .cpnc = CPNC_LINUX,
1041 .cpvc_linux = 0,
1042 .cpvc_distro = {0},
1043 };
1044
1045 if (!sclp.has_diag318)
1046 return;
1047
1048 diag_stat_inc(DIAG_STAT_X318);
1049 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1050}
1051
1052/*
1053 * Print the component list from the IPL report
1054 */
1055static void __init log_component_list(void)
1056{
1057 struct ipl_rb_component_entry *ptr, *end;
1058 char *str;
1059
1060 if (!early_ipl_comp_list_addr)
1061 return;
1062 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR)
1063 pr_info("Linux is running with Secure-IPL enabled\n");
1064 else
1065 pr_info("Linux is running with Secure-IPL disabled\n");
1066 ptr = (void *) early_ipl_comp_list_addr;
1067 end = (void *) ptr + early_ipl_comp_list_size;
1068 pr_info("The IPL report contains the following components:\n");
1069 while (ptr < end) {
1070 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1071 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1072 str = "signed, verified";
1073 else
1074 str = "signed, verification failed";
1075 } else {
1076 str = "not signed";
1077 }
1078 pr_info("%016llx - %016llx (%s)\n",
1079 ptr->addr, ptr->addr + ptr->len, str);
1080 ptr++;
1081 }
1082}
1083
1084/*
1085 * Setup function called from init/main.c just after the banner
1086 * was printed.
1087 */
1088
1089void __init setup_arch(char **cmdline_p)
1090{
1091 /*
1092 * print what head.S has found out about the machine
1093 */
1094 if (MACHINE_IS_VM)
1095 pr_info("Linux is running as a z/VM "
1096 "guest operating system in 64-bit mode\n");
1097 else if (MACHINE_IS_KVM)
1098 pr_info("Linux is running under KVM in 64-bit mode\n");
1099 else if (MACHINE_IS_LPAR)
1100 pr_info("Linux is running natively in 64-bit mode\n");
1101 else
1102 pr_info("Linux is running as a guest in 64-bit mode\n");
1103
1104 log_component_list();
1105
1106 /* Have one command line that is parsed and saved in /proc/cmdline */
1107 /* boot_command_line has been already set up in early.c */
1108 *cmdline_p = boot_command_line;
1109
1110 ROOT_DEV = Root_RAM0;
1111
1112 init_mm.start_code = (unsigned long) _text;
1113 init_mm.end_code = (unsigned long) _etext;
1114 init_mm.end_data = (unsigned long) _edata;
1115 init_mm.brk = (unsigned long) _end;
1116
1117 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1118 nospec_auto_detect();
1119
1120 parse_early_param();
1121#ifdef CONFIG_CRASH_DUMP
1122 /* Deactivate elfcorehdr= kernel parameter */
1123 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1124#endif
1125
1126 os_info_init();
1127 setup_ipl();
1128 setup_task_size();
1129 setup_control_program_code();
1130
1131 /* Do some memory reservations *before* memory is added to memblock */
1132 reserve_memory_end();
1133 reserve_oldmem();
1134 reserve_kernel();
1135 reserve_initrd();
1136 reserve_certificate_list();
1137 reserve_mem_detect_info();
1138 memblock_allow_resize();
1139
1140 /* Get information about *all* installed memory */
1141 memblock_add_mem_detect_info();
1142
1143 free_mem_detect_info();
1144 remove_oldmem();
1145
1146 /*
1147 * Make sure all chunks are MAX_ORDER aligned so we don't need the
1148 * extra checks that HOLES_IN_ZONE would require.
1149 *
1150 * Is this still required?
1151 */
1152 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
1153
1154 setup_memory_end();
1155 setup_memory();
1156 dma_contiguous_reserve(memory_end);
1157 vmcp_cma_reserve();
1158
1159 check_initrd();
1160 reserve_crashkernel();
1161#ifdef CONFIG_CRASH_DUMP
1162 /*
1163 * Be aware that smp_save_dump_cpus() triggers a system reset.
1164 * Therefore CPU and device initialization should be done afterwards.
1165 */
1166 smp_save_dump_cpus();
1167#endif
1168
1169 setup_resources();
1170 setup_lowcore_dat_off();
1171 smp_fill_possible_mask();
1172 cpu_detect_mhz_feature();
1173 cpu_init();
1174 numa_setup();
1175 smp_detect_cpus();
1176 topology_init_early();
1177
1178 /*
1179 * Create kernel page tables and switch to virtual addressing.
1180 */
1181 paging_init();
1182
1183 /*
1184 * After paging_init created the kernel page table, the new PSWs
1185 * in lowcore can now run with DAT enabled.
1186 */
1187 setup_lowcore_dat_on();
1188
1189 /* Setup default console */
1190 conmode_default();
1191 set_preferred_console();
1192
1193 apply_alternative_instructions();
1194 if (IS_ENABLED(CONFIG_EXPOLINE))
1195 nospec_init_branches();
1196
1197 /* Setup zfcpdump support */
1198 setup_zfcpdump();
1199
1200 /* Add system specific data to the random pool */
1201 setup_randomness();
1202}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
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#include <linux/kmemleak.h>
54
55#include <asm/archrandom.h>
56#include <asm/boot_data.h>
57#include <asm/ipl.h>
58#include <asm/facility.h>
59#include <asm/smp.h>
60#include <asm/mmu_context.h>
61#include <asm/cpcmd.h>
62#include <asm/abs_lowcore.h>
63#include <asm/nmi.h>
64#include <asm/irq.h>
65#include <asm/page.h>
66#include <asm/ptrace.h>
67#include <asm/sections.h>
68#include <asm/ebcdic.h>
69#include <asm/diag.h>
70#include <asm/os_info.h>
71#include <asm/sclp.h>
72#include <asm/stacktrace.h>
73#include <asm/sysinfo.h>
74#include <asm/numa.h>
75#include <asm/alternative.h>
76#include <asm/nospec-branch.h>
77#include <asm/mem_detect.h>
78#include <asm/maccess.h>
79#include <asm/uv.h>
80#include <asm/asm-offsets.h>
81#include "entry.h"
82
83/*
84 * Machine setup..
85 */
86unsigned int console_mode = 0;
87EXPORT_SYMBOL(console_mode);
88
89unsigned int console_devno = -1;
90EXPORT_SYMBOL(console_devno);
91
92unsigned int console_irq = -1;
93EXPORT_SYMBOL(console_irq);
94
95/*
96 * Some code and data needs to stay below 2 GB, even when the kernel would be
97 * relocated above 2 GB, because it has to use 31 bit addresses.
98 * Such code and data is part of the .amode31 section.
99 */
100unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
101unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
102unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
103unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31;
104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
106
107/*
108 * Control registers CR2, CR5 and CR15 are initialized with addresses
109 * of tables that must be placed below 2G which is handled by the AMODE31
110 * sections.
111 * Because the AMODE31 sections are relocated below 2G at startup,
112 * the content of control registers CR2, CR5 and CR15 must be updated
113 * with new addresses after the relocation. The initial initialization of
114 * control registers occurs in head64.S and then gets updated again after AMODE31
115 * relocation. We must access the relevant AMODE31 tables indirectly via
116 * pointers placed in the .amode31.refs linker section. Those pointers get
117 * updated automatically during AMODE31 relocation and always contain a valid
118 * address within AMODE31 sections.
119 */
120
121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125};
126
127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
128 0x80000000, 0, 0, 0,
129 0x80000000, 0, 0, 0,
130 0x80000000, 0, 0, 0,
131 0x80000000, 0, 0, 0,
132 0x80000000, 0, 0, 0,
133 0x80000000, 0, 0, 0,
134 0x80000000, 0, 0, 0,
135 0x80000000, 0, 0, 0
136};
137
138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141};
142
143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148int __bootdata(noexec_disabled);
149unsigned long __bootdata(ident_map_size);
150struct mem_detect_info __bootdata(mem_detect);
151struct initrd_data __bootdata(initrd_data);
152
153unsigned long __bootdata_preserved(__kaslr_offset);
154unsigned long __bootdata(__amode31_base);
155unsigned int __bootdata_preserved(zlib_dfltcc_support);
156EXPORT_SYMBOL(zlib_dfltcc_support);
157u64 __bootdata_preserved(stfle_fac_list[16]);
158EXPORT_SYMBOL(stfle_fac_list);
159u64 __bootdata_preserved(alt_stfle_fac_list[16]);
160struct oldmem_data __bootdata_preserved(oldmem_data);
161
162unsigned long VMALLOC_START;
163EXPORT_SYMBOL(VMALLOC_START);
164
165unsigned long VMALLOC_END;
166EXPORT_SYMBOL(VMALLOC_END);
167
168struct page *vmemmap;
169EXPORT_SYMBOL(vmemmap);
170unsigned long vmemmap_size;
171
172unsigned long MODULES_VADDR;
173unsigned long MODULES_END;
174
175/* An array with a pointer to the lowcore of every CPU. */
176struct lowcore *lowcore_ptr[NR_CPUS];
177EXPORT_SYMBOL(lowcore_ptr);
178
179DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
180
181/*
182 * The Write Back bit position in the physaddr is given by the SLPC PCI.
183 * Leaving the mask zero always uses write through which is safe
184 */
185unsigned long mio_wb_bit_mask __ro_after_init;
186
187/*
188 * This is set up by the setup-routine at boot-time
189 * for S390 need to find out, what we have to setup
190 * using address 0x10400 ...
191 */
192
193#include <asm/setup.h>
194
195/*
196 * condev= and conmode= setup parameter.
197 */
198
199static int __init condev_setup(char *str)
200{
201 int vdev;
202
203 vdev = simple_strtoul(str, &str, 0);
204 if (vdev >= 0 && vdev < 65536) {
205 console_devno = vdev;
206 console_irq = -1;
207 }
208 return 1;
209}
210
211__setup("condev=", condev_setup);
212
213static void __init set_preferred_console(void)
214{
215 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
216 add_preferred_console("ttyS", 0, NULL);
217 else if (CONSOLE_IS_3270)
218 add_preferred_console("tty3270", 0, NULL);
219 else if (CONSOLE_IS_VT220)
220 add_preferred_console("ttysclp", 0, NULL);
221 else if (CONSOLE_IS_HVC)
222 add_preferred_console("hvc", 0, NULL);
223}
224
225static int __init conmode_setup(char *str)
226{
227#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
229 SET_CONSOLE_SCLP;
230#endif
231#if defined(CONFIG_TN3215_CONSOLE)
232 if (!strcmp(str, "3215"))
233 SET_CONSOLE_3215;
234#endif
235#if defined(CONFIG_TN3270_CONSOLE)
236 if (!strcmp(str, "3270"))
237 SET_CONSOLE_3270;
238#endif
239 set_preferred_console();
240 return 1;
241}
242
243__setup("conmode=", conmode_setup);
244
245static void __init conmode_default(void)
246{
247 char query_buffer[1024];
248 char *ptr;
249
250 if (MACHINE_IS_VM) {
251 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
252 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
253 ptr = strstr(query_buffer, "SUBCHANNEL =");
254 console_irq = simple_strtoul(ptr + 13, NULL, 16);
255 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
256 ptr = strstr(query_buffer, "CONMODE");
257 /*
258 * Set the conmode to 3215 so that the device recognition
259 * will set the cu_type of the console to 3215. If the
260 * conmode is 3270 and we don't set it back then both
261 * 3215 and the 3270 driver will try to access the console
262 * device (3215 as console and 3270 as normal tty).
263 */
264 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
265 if (ptr == NULL) {
266#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
267 SET_CONSOLE_SCLP;
268#endif
269 return;
270 }
271 if (str_has_prefix(ptr + 8, "3270")) {
272#if defined(CONFIG_TN3270_CONSOLE)
273 SET_CONSOLE_3270;
274#elif defined(CONFIG_TN3215_CONSOLE)
275 SET_CONSOLE_3215;
276#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
277 SET_CONSOLE_SCLP;
278#endif
279 } else if (str_has_prefix(ptr + 8, "3215")) {
280#if defined(CONFIG_TN3215_CONSOLE)
281 SET_CONSOLE_3215;
282#elif defined(CONFIG_TN3270_CONSOLE)
283 SET_CONSOLE_3270;
284#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
285 SET_CONSOLE_SCLP;
286#endif
287 }
288 } else if (MACHINE_IS_KVM) {
289 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
290 SET_CONSOLE_VT220;
291 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
292 SET_CONSOLE_SCLP;
293 else
294 SET_CONSOLE_HVC;
295 } else {
296#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
297 SET_CONSOLE_SCLP;
298#endif
299 }
300}
301
302#ifdef CONFIG_CRASH_DUMP
303static void __init setup_zfcpdump(void)
304{
305 if (!is_ipl_type_dump())
306 return;
307 if (oldmem_data.start)
308 return;
309 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
310 console_loglevel = 2;
311}
312#else
313static inline void setup_zfcpdump(void) {}
314#endif /* CONFIG_CRASH_DUMP */
315
316 /*
317 * Reboot, halt and power_off stubs. They just call _machine_restart,
318 * _machine_halt or _machine_power_off.
319 */
320
321void machine_restart(char *command)
322{
323 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
324 /*
325 * Only unblank the console if we are called in enabled
326 * context or a bust_spinlocks cleared the way for us.
327 */
328 console_unblank();
329 _machine_restart(command);
330}
331
332void machine_halt(void)
333{
334 if (!in_interrupt() || oops_in_progress)
335 /*
336 * Only unblank the console if we are called in enabled
337 * context or a bust_spinlocks cleared the way for us.
338 */
339 console_unblank();
340 _machine_halt();
341}
342
343void machine_power_off(void)
344{
345 if (!in_interrupt() || oops_in_progress)
346 /*
347 * Only unblank the console if we are called in enabled
348 * context or a bust_spinlocks cleared the way for us.
349 */
350 console_unblank();
351 _machine_power_off();
352}
353
354/*
355 * Dummy power off function.
356 */
357void (*pm_power_off)(void) = machine_power_off;
358EXPORT_SYMBOL_GPL(pm_power_off);
359
360void *restart_stack;
361
362unsigned long stack_alloc(void)
363{
364#ifdef CONFIG_VMAP_STACK
365 void *ret;
366
367 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
368 NUMA_NO_NODE, __builtin_return_address(0));
369 kmemleak_not_leak(ret);
370 return (unsigned long)ret;
371#else
372 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
373#endif
374}
375
376void stack_free(unsigned long stack)
377{
378#ifdef CONFIG_VMAP_STACK
379 vfree((void *) stack);
380#else
381 free_pages(stack, THREAD_SIZE_ORDER);
382#endif
383}
384
385int __init arch_early_irq_init(void)
386{
387 unsigned long stack;
388
389 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
390 if (!stack)
391 panic("Couldn't allocate async stack");
392 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
393 return 0;
394}
395
396void __init arch_call_rest_init(void)
397{
398 unsigned long stack;
399
400 smp_reinit_ipl_cpu();
401 stack = stack_alloc();
402 if (!stack)
403 panic("Couldn't allocate kernel stack");
404 current->stack = (void *) stack;
405#ifdef CONFIG_VMAP_STACK
406 current->stack_vm_area = (void *) stack;
407#endif
408 set_task_stack_end_magic(current);
409 stack += STACK_INIT_OFFSET;
410 S390_lowcore.kernel_stack = stack;
411 call_on_stack_noreturn(rest_init, stack);
412}
413
414static void __init setup_lowcore_dat_off(void)
415{
416 unsigned long int_psw_mask = PSW_KERNEL_BITS;
417 struct lowcore *abs_lc, *lc;
418 unsigned long mcck_stack;
419 unsigned long flags;
420
421 if (IS_ENABLED(CONFIG_KASAN))
422 int_psw_mask |= PSW_MASK_DAT;
423
424 /*
425 * Setup lowcore for boot cpu
426 */
427 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
428 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
429 if (!lc)
430 panic("%s: Failed to allocate %zu bytes align=%zx\n",
431 __func__, sizeof(*lc), sizeof(*lc));
432
433 lc->restart_psw.mask = PSW_KERNEL_BITS;
434 lc->restart_psw.addr = (unsigned long) restart_int_handler;
435 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
436 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
437 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
438 lc->svc_new_psw.addr = (unsigned long) system_call;
439 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
440 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
441 lc->mcck_new_psw.mask = int_psw_mask;
442 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
443 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
444 lc->io_new_psw.addr = (unsigned long) io_int_handler;
445 lc->clock_comparator = clock_comparator_max;
446 lc->nodat_stack = ((unsigned long) &init_thread_union)
447 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
448 lc->current_task = (unsigned long)&init_task;
449 lc->lpp = LPP_MAGIC;
450 lc->machine_flags = S390_lowcore.machine_flags;
451 lc->preempt_count = S390_lowcore.preempt_count;
452 nmi_alloc_mcesa_early(&lc->mcesad);
453 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
454 lc->exit_timer = S390_lowcore.exit_timer;
455 lc->user_timer = S390_lowcore.user_timer;
456 lc->system_timer = S390_lowcore.system_timer;
457 lc->steal_timer = S390_lowcore.steal_timer;
458 lc->last_update_timer = S390_lowcore.last_update_timer;
459 lc->last_update_clock = S390_lowcore.last_update_clock;
460
461 /*
462 * Allocate the global restart stack which is the same for
463 * all CPUs in cast *one* of them does a PSW restart.
464 */
465 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
466 if (!restart_stack)
467 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
468 __func__, THREAD_SIZE, THREAD_SIZE);
469 restart_stack += STACK_INIT_OFFSET;
470
471 /*
472 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
473 * restart data to the absolute zero lowcore. This is necessary if
474 * PSW restart is done on an offline CPU that has lowcore zero.
475 */
476 lc->restart_stack = (unsigned long) restart_stack;
477 lc->restart_fn = (unsigned long) do_restart;
478 lc->restart_data = 0;
479 lc->restart_source = -1U;
480
481 abs_lc = get_abs_lowcore(&flags);
482 abs_lc->restart_stack = lc->restart_stack;
483 abs_lc->restart_fn = lc->restart_fn;
484 abs_lc->restart_data = lc->restart_data;
485 abs_lc->restart_source = lc->restart_source;
486 abs_lc->restart_psw = lc->restart_psw;
487 abs_lc->mcesad = lc->mcesad;
488 put_abs_lowcore(abs_lc, flags);
489
490 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
491 if (!mcck_stack)
492 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
493 __func__, THREAD_SIZE, THREAD_SIZE);
494 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
495
496 lc->spinlock_lockval = arch_spin_lockval(0);
497 lc->spinlock_index = 0;
498 arch_spin_lock_setup(0);
499 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
500 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
501 lc->preempt_count = PREEMPT_DISABLED;
502
503 set_prefix(__pa(lc));
504 lowcore_ptr[0] = lc;
505}
506
507static void __init setup_lowcore_dat_on(void)
508{
509 struct lowcore *abs_lc;
510 unsigned long flags;
511 int i;
512
513 __ctl_clear_bit(0, 28);
514 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
515 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
516 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
517 S390_lowcore.mcck_new_psw.mask |= PSW_MASK_DAT;
518 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
519 __ctl_set_bit(0, 28);
520 __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
521 if (abs_lowcore_map(0, lowcore_ptr[0], true))
522 panic("Couldn't setup absolute lowcore");
523 abs_lowcore_mapped = true;
524 abs_lc = get_abs_lowcore(&flags);
525 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
526 abs_lc->program_new_psw = S390_lowcore.program_new_psw;
527 for (i = 0; i < 16; i++)
528 abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i];
529 put_abs_lowcore(abs_lc, flags);
530}
531
532static struct resource code_resource = {
533 .name = "Kernel code",
534 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
535};
536
537static struct resource data_resource = {
538 .name = "Kernel data",
539 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
540};
541
542static struct resource bss_resource = {
543 .name = "Kernel bss",
544 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
545};
546
547static struct resource __initdata *standard_resources[] = {
548 &code_resource,
549 &data_resource,
550 &bss_resource,
551};
552
553static void __init setup_resources(void)
554{
555 struct resource *res, *std_res, *sub_res;
556 phys_addr_t start, end;
557 int j;
558 u64 i;
559
560 code_resource.start = (unsigned long) _text;
561 code_resource.end = (unsigned long) _etext - 1;
562 data_resource.start = (unsigned long) _etext;
563 data_resource.end = (unsigned long) _edata - 1;
564 bss_resource.start = (unsigned long) __bss_start;
565 bss_resource.end = (unsigned long) __bss_stop - 1;
566
567 for_each_mem_range(i, &start, &end) {
568 res = memblock_alloc(sizeof(*res), 8);
569 if (!res)
570 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
571 __func__, sizeof(*res), 8);
572 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
573
574 res->name = "System RAM";
575 res->start = start;
576 /*
577 * In memblock, end points to the first byte after the
578 * range while in resourses, end points to the last byte in
579 * the range.
580 */
581 res->end = end - 1;
582 request_resource(&iomem_resource, res);
583
584 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
585 std_res = standard_resources[j];
586 if (std_res->start < res->start ||
587 std_res->start > res->end)
588 continue;
589 if (std_res->end > res->end) {
590 sub_res = memblock_alloc(sizeof(*sub_res), 8);
591 if (!sub_res)
592 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
593 __func__, sizeof(*sub_res), 8);
594 *sub_res = *std_res;
595 sub_res->end = res->end;
596 std_res->start = res->end + 1;
597 request_resource(res, sub_res);
598 } else {
599 request_resource(res, std_res);
600 }
601 }
602 }
603#ifdef CONFIG_CRASH_DUMP
604 /*
605 * Re-add removed crash kernel memory as reserved memory. This makes
606 * sure it will be mapped with the identity mapping and struct pages
607 * will be created, so it can be resized later on.
608 * However add it later since the crash kernel resource should not be
609 * part of the System RAM resource.
610 */
611 if (crashk_res.end) {
612 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
613 0, MEMBLOCK_NONE);
614 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
615 insert_resource(&iomem_resource, &crashk_res);
616 }
617#endif
618}
619
620static void __init setup_memory_end(void)
621{
622 memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size);
623 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
624 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
625}
626
627#ifdef CONFIG_CRASH_DUMP
628
629/*
630 * When kdump is enabled, we have to ensure that no memory from the area
631 * [0 - crashkernel memory size] is set offline - it will be exchanged with
632 * the crashkernel memory region when kdump is triggered. The crashkernel
633 * memory region can never get offlined (pages are unmovable).
634 */
635static int kdump_mem_notifier(struct notifier_block *nb,
636 unsigned long action, void *data)
637{
638 struct memory_notify *arg = data;
639
640 if (action != MEM_GOING_OFFLINE)
641 return NOTIFY_OK;
642 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
643 return NOTIFY_BAD;
644 return NOTIFY_OK;
645}
646
647static struct notifier_block kdump_mem_nb = {
648 .notifier_call = kdump_mem_notifier,
649};
650
651#endif
652
653/*
654 * Reserve memory for kdump kernel to be loaded with kexec
655 */
656static void __init reserve_crashkernel(void)
657{
658#ifdef CONFIG_CRASH_DUMP
659 unsigned long long crash_base, crash_size;
660 phys_addr_t low, high;
661 int rc;
662
663 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
664 &crash_base);
665
666 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
667 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
668 if (rc || crash_size == 0)
669 return;
670
671 if (memblock.memory.regions[0].size < crash_size) {
672 pr_info("crashkernel reservation failed: %s\n",
673 "first memory chunk must be at least crashkernel size");
674 return;
675 }
676
677 low = crash_base ?: oldmem_data.start;
678 high = low + crash_size;
679 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
680 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
681 crash_base = low;
682 } else {
683 /* Find suitable area in free memory */
684 low = max_t(unsigned long, crash_size, sclp.hsa_size);
685 high = crash_base ? crash_base + crash_size : ULONG_MAX;
686
687 if (crash_base && crash_base < low) {
688 pr_info("crashkernel reservation failed: %s\n",
689 "crash_base too low");
690 return;
691 }
692 low = crash_base ?: low;
693 crash_base = memblock_phys_alloc_range(crash_size,
694 KEXEC_CRASH_MEM_ALIGN,
695 low, high);
696 }
697
698 if (!crash_base) {
699 pr_info("crashkernel reservation failed: %s\n",
700 "no suitable area found");
701 return;
702 }
703
704 if (register_memory_notifier(&kdump_mem_nb)) {
705 memblock_phys_free(crash_base, crash_size);
706 return;
707 }
708
709 if (!oldmem_data.start && MACHINE_IS_VM)
710 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
711 crashk_res.start = crash_base;
712 crashk_res.end = crash_base + crash_size - 1;
713 memblock_remove(crash_base, crash_size);
714 pr_info("Reserving %lluMB of memory at %lluMB "
715 "for crashkernel (System RAM: %luMB)\n",
716 crash_size >> 20, crash_base >> 20,
717 (unsigned long)memblock.memory.total_size >> 20);
718 os_info_crashkernel_add(crash_base, crash_size);
719#endif
720}
721
722/*
723 * Reserve the initrd from being used by memblock
724 */
725static void __init reserve_initrd(void)
726{
727#ifdef CONFIG_BLK_DEV_INITRD
728 if (!initrd_data.start || !initrd_data.size)
729 return;
730 initrd_start = (unsigned long)__va(initrd_data.start);
731 initrd_end = initrd_start + initrd_data.size;
732 memblock_reserve(initrd_data.start, initrd_data.size);
733#endif
734}
735
736/*
737 * Reserve the memory area used to pass the certificate lists
738 */
739static void __init reserve_certificate_list(void)
740{
741 if (ipl_cert_list_addr)
742 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
743}
744
745static void __init reserve_mem_detect_info(void)
746{
747 unsigned long start, size;
748
749 get_mem_detect_reserved(&start, &size);
750 if (size)
751 memblock_reserve(start, size);
752}
753
754static void __init free_mem_detect_info(void)
755{
756 unsigned long start, size;
757
758 get_mem_detect_reserved(&start, &size);
759 if (size)
760 memblock_phys_free(start, size);
761}
762
763static const char * __init get_mem_info_source(void)
764{
765 switch (mem_detect.info_source) {
766 case MEM_DETECT_SCLP_STOR_INFO:
767 return "sclp storage info";
768 case MEM_DETECT_DIAG260:
769 return "diag260";
770 case MEM_DETECT_SCLP_READ_INFO:
771 return "sclp read info";
772 case MEM_DETECT_BIN_SEARCH:
773 return "binary search";
774 }
775 return "none";
776}
777
778static void __init memblock_add_mem_detect_info(void)
779{
780 unsigned long start, end;
781 int i;
782
783 pr_debug("physmem info source: %s (%hhd)\n",
784 get_mem_info_source(), mem_detect.info_source);
785 /* keep memblock lists close to the kernel */
786 memblock_set_bottom_up(true);
787 for_each_mem_detect_block(i, &start, &end) {
788 memblock_add(start, end - start);
789 memblock_physmem_add(start, end - start);
790 }
791 memblock_set_bottom_up(false);
792 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
793}
794
795/*
796 * Check for initrd being in usable memory
797 */
798static void __init check_initrd(void)
799{
800#ifdef CONFIG_BLK_DEV_INITRD
801 if (initrd_data.start && initrd_data.size &&
802 !memblock_is_region_memory(initrd_data.start, initrd_data.size)) {
803 pr_err("The initial RAM disk does not fit into the memory\n");
804 memblock_phys_free(initrd_data.start, initrd_data.size);
805 initrd_start = initrd_end = 0;
806 }
807#endif
808}
809
810/*
811 * Reserve memory used for lowcore/command line/kernel image.
812 */
813static void __init reserve_kernel(void)
814{
815 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
816 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
817 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
818 memblock_reserve(__amode31_base, __eamode31 - __samode31);
819 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
820 memblock_reserve(__pa(_stext), _end - _stext);
821}
822
823static void __init setup_memory(void)
824{
825 phys_addr_t start, end;
826 u64 i;
827
828 /*
829 * Init storage key for present memory
830 */
831 for_each_mem_range(i, &start, &end)
832 storage_key_init_range(start, end);
833
834 psw_set_key(PAGE_DEFAULT_KEY);
835}
836
837static void __init relocate_amode31_section(void)
838{
839 unsigned long amode31_size = __eamode31 - __samode31;
840 long amode31_offset = __amode31_base - __samode31;
841 long *ptr;
842
843 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
844
845 /* Move original AMODE31 section to the new one */
846 memmove((void *)__amode31_base, (void *)__samode31, amode31_size);
847 /* Zero out the old AMODE31 section to catch invalid accesses within it */
848 memset((void *)__samode31, 0, amode31_size);
849
850 /* Update all AMODE31 region references */
851 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
852 *ptr += amode31_offset;
853}
854
855/* This must be called after AMODE31 relocation */
856static void __init setup_cr(void)
857{
858 union ctlreg2 cr2;
859 union ctlreg5 cr5;
860 union ctlreg15 cr15;
861
862 __ctl_duct[1] = (unsigned long)__ctl_aste;
863 __ctl_duct[2] = (unsigned long)__ctl_aste;
864 __ctl_duct[4] = (unsigned long)__ctl_duald;
865
866 /* Update control registers CR2, CR5 and CR15 */
867 __ctl_store(cr2.val, 2, 2);
868 __ctl_store(cr5.val, 5, 5);
869 __ctl_store(cr15.val, 15, 15);
870 cr2.ducto = (unsigned long)__ctl_duct >> 6;
871 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
872 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
873 __ctl_load(cr2.val, 2, 2);
874 __ctl_load(cr5.val, 5, 5);
875 __ctl_load(cr15.val, 15, 15);
876}
877
878/*
879 * Add system information as device randomness
880 */
881static void __init setup_randomness(void)
882{
883 struct sysinfo_3_2_2 *vmms;
884
885 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
886 if (!vmms)
887 panic("Failed to allocate memory for sysinfo structure\n");
888 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
889 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
890 memblock_free(vmms, PAGE_SIZE);
891
892 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
893 static_branch_enable(&s390_arch_random_available);
894}
895
896/*
897 * Find the correct size for the task_struct. This depends on
898 * the size of the struct fpu at the end of the thread_struct
899 * which is embedded in the task_struct.
900 */
901static void __init setup_task_size(void)
902{
903 int task_size = sizeof(struct task_struct);
904
905 if (!MACHINE_HAS_VX) {
906 task_size -= sizeof(__vector128) * __NUM_VXRS;
907 task_size += sizeof(freg_t) * __NUM_FPRS;
908 }
909 arch_task_struct_size = task_size;
910}
911
912/*
913 * Issue diagnose 318 to set the control program name and
914 * version codes.
915 */
916static void __init setup_control_program_code(void)
917{
918 union diag318_info diag318_info = {
919 .cpnc = CPNC_LINUX,
920 .cpvc = 0,
921 };
922
923 if (!sclp.has_diag318)
924 return;
925
926 diag_stat_inc(DIAG_STAT_X318);
927 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
928}
929
930/*
931 * Print the component list from the IPL report
932 */
933static void __init log_component_list(void)
934{
935 struct ipl_rb_component_entry *ptr, *end;
936 char *str;
937
938 if (!early_ipl_comp_list_addr)
939 return;
940 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
941 pr_info("Linux is running with Secure-IPL enabled\n");
942 else
943 pr_info("Linux is running with Secure-IPL disabled\n");
944 ptr = (void *) early_ipl_comp_list_addr;
945 end = (void *) ptr + early_ipl_comp_list_size;
946 pr_info("The IPL report contains the following components:\n");
947 while (ptr < end) {
948 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
949 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
950 str = "signed, verified";
951 else
952 str = "signed, verification failed";
953 } else {
954 str = "not signed";
955 }
956 pr_info("%016llx - %016llx (%s)\n",
957 ptr->addr, ptr->addr + ptr->len, str);
958 ptr++;
959 }
960}
961
962/*
963 * Setup function called from init/main.c just after the banner
964 * was printed.
965 */
966
967void __init setup_arch(char **cmdline_p)
968{
969 /*
970 * print what head.S has found out about the machine
971 */
972 if (MACHINE_IS_VM)
973 pr_info("Linux is running as a z/VM "
974 "guest operating system in 64-bit mode\n");
975 else if (MACHINE_IS_KVM)
976 pr_info("Linux is running under KVM in 64-bit mode\n");
977 else if (MACHINE_IS_LPAR)
978 pr_info("Linux is running natively in 64-bit mode\n");
979 else
980 pr_info("Linux is running as a guest in 64-bit mode\n");
981
982 log_component_list();
983
984 /* Have one command line that is parsed and saved in /proc/cmdline */
985 /* boot_command_line has been already set up in early.c */
986 *cmdline_p = boot_command_line;
987
988 ROOT_DEV = Root_RAM0;
989
990 setup_initial_init_mm(_text, _etext, _edata, _end);
991
992 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
993 nospec_auto_detect();
994
995 jump_label_init();
996 parse_early_param();
997#ifdef CONFIG_CRASH_DUMP
998 /* Deactivate elfcorehdr= kernel parameter */
999 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1000#endif
1001
1002 os_info_init();
1003 setup_ipl();
1004 setup_task_size();
1005 setup_control_program_code();
1006
1007 /* Do some memory reservations *before* memory is added to memblock */
1008 reserve_kernel();
1009 reserve_initrd();
1010 reserve_certificate_list();
1011 reserve_mem_detect_info();
1012 memblock_set_current_limit(ident_map_size);
1013 memblock_allow_resize();
1014
1015 /* Get information about *all* installed memory */
1016 memblock_add_mem_detect_info();
1017
1018 free_mem_detect_info();
1019 setup_memory_end();
1020 memblock_dump_all();
1021 setup_memory();
1022
1023 relocate_amode31_section();
1024 setup_cr();
1025 setup_uv();
1026 dma_contiguous_reserve(ident_map_size);
1027 vmcp_cma_reserve();
1028 if (MACHINE_HAS_EDAT2)
1029 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1030
1031 check_initrd();
1032 reserve_crashkernel();
1033#ifdef CONFIG_CRASH_DUMP
1034 /*
1035 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
1036 * Therefore CPU and device initialization should be done afterwards.
1037 */
1038 smp_save_dump_secondary_cpus();
1039#endif
1040
1041 setup_resources();
1042 setup_lowcore_dat_off();
1043 smp_fill_possible_mask();
1044 cpu_detect_mhz_feature();
1045 cpu_init();
1046 numa_setup();
1047 smp_detect_cpus();
1048 topology_init_early();
1049
1050 if (test_facility(193))
1051 static_branch_enable(&cpu_has_bear);
1052
1053 /*
1054 * Create kernel page tables and switch to virtual addressing.
1055 */
1056 paging_init();
1057 memcpy_real_init();
1058 /*
1059 * After paging_init created the kernel page table, the new PSWs
1060 * in lowcore can now run with DAT enabled.
1061 */
1062 setup_lowcore_dat_on();
1063#ifdef CONFIG_CRASH_DUMP
1064 smp_save_dump_ipl_cpu();
1065#endif
1066
1067 /* Setup default console */
1068 conmode_default();
1069 set_preferred_console();
1070
1071 apply_alternative_instructions();
1072 if (IS_ENABLED(CONFIG_EXPOLINE))
1073 nospec_init_branches();
1074
1075 /* Setup zfcp/nvme dump support */
1076 setup_zfcpdump();
1077
1078 /* Add system specific data to the random pool */
1079 setup_randomness();
1080}