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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-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}
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/physmem_info.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 */
100char __amode31_ref *__samode31 = _samode31;
101char __amode31_ref *__eamode31 = _eamode31;
102char __amode31_ref *__stext_amode31 = _stext_amode31;
103char __amode31_ref *__etext_amode31 = _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
148unsigned long __bootdata_preserved(max_mappable);
149unsigned long __bootdata(ident_map_size);
150struct physmem_info __bootdata(physmem_info);
151
152unsigned long __bootdata_preserved(__kaslr_offset);
153int __bootdata_preserved(__kaslr_enabled);
154unsigned int __bootdata_preserved(zlib_dfltcc_support);
155EXPORT_SYMBOL(zlib_dfltcc_support);
156u64 __bootdata_preserved(stfle_fac_list[16]);
157EXPORT_SYMBOL(stfle_fac_list);
158u64 alt_stfle_fac_list[16];
159struct oldmem_data __bootdata_preserved(oldmem_data);
160
161unsigned long VMALLOC_START;
162EXPORT_SYMBOL(VMALLOC_START);
163
164unsigned long VMALLOC_END;
165EXPORT_SYMBOL(VMALLOC_END);
166
167struct page *vmemmap;
168EXPORT_SYMBOL(vmemmap);
169unsigned long vmemmap_size;
170
171unsigned long MODULES_VADDR;
172unsigned long MODULES_END;
173
174/* An array with a pointer to the lowcore of every CPU. */
175struct lowcore *lowcore_ptr[NR_CPUS];
176EXPORT_SYMBOL(lowcore_ptr);
177
178DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
179
180/*
181 * The Write Back bit position in the physaddr is given by the SLPC PCI.
182 * Leaving the mask zero always uses write through which is safe
183 */
184unsigned long mio_wb_bit_mask __ro_after_init;
185
186/*
187 * This is set up by the setup-routine at boot-time
188 * for S390 need to find out, what we have to setup
189 * using address 0x10400 ...
190 */
191
192#include <asm/setup.h>
193
194/*
195 * condev= and conmode= setup parameter.
196 */
197
198static int __init condev_setup(char *str)
199{
200 int vdev;
201
202 vdev = simple_strtoul(str, &str, 0);
203 if (vdev >= 0 && vdev < 65536) {
204 console_devno = vdev;
205 console_irq = -1;
206 }
207 return 1;
208}
209
210__setup("condev=", condev_setup);
211
212static void __init set_preferred_console(void)
213{
214 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
215 add_preferred_console("ttyS", 0, NULL);
216 else if (CONSOLE_IS_3270)
217 add_preferred_console("tty3270", 0, NULL);
218 else if (CONSOLE_IS_VT220)
219 add_preferred_console("ttysclp", 0, NULL);
220 else if (CONSOLE_IS_HVC)
221 add_preferred_console("hvc", 0, NULL);
222}
223
224static int __init conmode_setup(char *str)
225{
226#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
227 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
228 SET_CONSOLE_SCLP;
229#endif
230#if defined(CONFIG_TN3215_CONSOLE)
231 if (!strcmp(str, "3215"))
232 SET_CONSOLE_3215;
233#endif
234#if defined(CONFIG_TN3270_CONSOLE)
235 if (!strcmp(str, "3270"))
236 SET_CONSOLE_3270;
237#endif
238 set_preferred_console();
239 return 1;
240}
241
242__setup("conmode=", conmode_setup);
243
244static void __init conmode_default(void)
245{
246 char query_buffer[1024];
247 char *ptr;
248
249 if (MACHINE_IS_VM) {
250 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
251 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
252 ptr = strstr(query_buffer, "SUBCHANNEL =");
253 console_irq = simple_strtoul(ptr + 13, NULL, 16);
254 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
255 ptr = strstr(query_buffer, "CONMODE");
256 /*
257 * Set the conmode to 3215 so that the device recognition
258 * will set the cu_type of the console to 3215. If the
259 * conmode is 3270 and we don't set it back then both
260 * 3215 and the 3270 driver will try to access the console
261 * device (3215 as console and 3270 as normal tty).
262 */
263 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
264 if (ptr == NULL) {
265#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
266 SET_CONSOLE_SCLP;
267#endif
268 return;
269 }
270 if (str_has_prefix(ptr + 8, "3270")) {
271#if defined(CONFIG_TN3270_CONSOLE)
272 SET_CONSOLE_3270;
273#elif defined(CONFIG_TN3215_CONSOLE)
274 SET_CONSOLE_3215;
275#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
276 SET_CONSOLE_SCLP;
277#endif
278 } else if (str_has_prefix(ptr + 8, "3215")) {
279#if defined(CONFIG_TN3215_CONSOLE)
280 SET_CONSOLE_3215;
281#elif defined(CONFIG_TN3270_CONSOLE)
282 SET_CONSOLE_3270;
283#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
284 SET_CONSOLE_SCLP;
285#endif
286 }
287 } else if (MACHINE_IS_KVM) {
288 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
289 SET_CONSOLE_VT220;
290 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
291 SET_CONSOLE_SCLP;
292 else
293 SET_CONSOLE_HVC;
294 } else {
295#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
296 SET_CONSOLE_SCLP;
297#endif
298 }
299}
300
301#ifdef CONFIG_CRASH_DUMP
302static void __init setup_zfcpdump(void)
303{
304 if (!is_ipl_type_dump())
305 return;
306 if (oldmem_data.start)
307 return;
308 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
309 console_loglevel = 2;
310}
311#else
312static inline void setup_zfcpdump(void) {}
313#endif /* CONFIG_CRASH_DUMP */
314
315 /*
316 * Reboot, halt and power_off stubs. They just call _machine_restart,
317 * _machine_halt or _machine_power_off.
318 */
319
320void machine_restart(char *command)
321{
322 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
323 /*
324 * Only unblank the console if we are called in enabled
325 * context or a bust_spinlocks cleared the way for us.
326 */
327 console_unblank();
328 _machine_restart(command);
329}
330
331void machine_halt(void)
332{
333 if (!in_interrupt() || oops_in_progress)
334 /*
335 * Only unblank the console if we are called in enabled
336 * context or a bust_spinlocks cleared the way for us.
337 */
338 console_unblank();
339 _machine_halt();
340}
341
342void machine_power_off(void)
343{
344 if (!in_interrupt() || oops_in_progress)
345 /*
346 * Only unblank the console if we are called in enabled
347 * context or a bust_spinlocks cleared the way for us.
348 */
349 console_unblank();
350 _machine_power_off();
351}
352
353/*
354 * Dummy power off function.
355 */
356void (*pm_power_off)(void) = machine_power_off;
357EXPORT_SYMBOL_GPL(pm_power_off);
358
359void *restart_stack;
360
361unsigned long stack_alloc(void)
362{
363#ifdef CONFIG_VMAP_STACK
364 void *ret;
365
366 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
367 NUMA_NO_NODE, __builtin_return_address(0));
368 kmemleak_not_leak(ret);
369 return (unsigned long)ret;
370#else
371 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
372#endif
373}
374
375void stack_free(unsigned long stack)
376{
377#ifdef CONFIG_VMAP_STACK
378 vfree((void *) stack);
379#else
380 free_pages(stack, THREAD_SIZE_ORDER);
381#endif
382}
383
384static unsigned long __init stack_alloc_early(void)
385{
386 unsigned long stack;
387
388 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
389 if (!stack) {
390 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
391 __func__, THREAD_SIZE, THREAD_SIZE);
392 }
393 return stack;
394}
395
396static void __init setup_lowcore(void)
397{
398 struct lowcore *lc, *abs_lc;
399
400 /*
401 * Setup lowcore for boot cpu
402 */
403 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
404 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
405 if (!lc)
406 panic("%s: Failed to allocate %zu bytes align=%zx\n",
407 __func__, sizeof(*lc), sizeof(*lc));
408
409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
410 lc->restart_psw.addr = __pa(restart_int_handler);
411 lc->external_new_psw.mask = PSW_KERNEL_BITS;
412 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
413 lc->svc_new_psw.mask = PSW_KERNEL_BITS;
414 lc->svc_new_psw.addr = (unsigned long) system_call;
415 lc->program_new_psw.mask = PSW_KERNEL_BITS;
416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
419 lc->io_new_psw.mask = PSW_KERNEL_BITS;
420 lc->io_new_psw.addr = (unsigned long) io_int_handler;
421 lc->clock_comparator = clock_comparator_max;
422 lc->current_task = (unsigned long)&init_task;
423 lc->lpp = LPP_MAGIC;
424 lc->machine_flags = S390_lowcore.machine_flags;
425 lc->preempt_count = S390_lowcore.preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
428 lc->exit_timer = S390_lowcore.exit_timer;
429 lc->user_timer = S390_lowcore.user_timer;
430 lc->system_timer = S390_lowcore.system_timer;
431 lc->steal_timer = S390_lowcore.steal_timer;
432 lc->last_update_timer = S390_lowcore.last_update_timer;
433 lc->last_update_clock = S390_lowcore.last_update_clock;
434 /*
435 * Allocate the global restart stack which is the same for
436 * all CPUs in case *one* of them does a PSW restart.
437 */
438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
442 lc->kernel_stack = S390_lowcore.kernel_stack;
443 /*
444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
445 * restart data to the absolute zero lowcore. This is necessary if
446 * PSW restart is done on an offline CPU that has lowcore zero.
447 */
448 lc->restart_stack = (unsigned long) restart_stack;
449 lc->restart_fn = (unsigned long) do_restart;
450 lc->restart_data = 0;
451 lc->restart_source = -1U;
452 lc->spinlock_lockval = arch_spin_lockval(0);
453 lc->spinlock_index = 0;
454 arch_spin_lock_setup(0);
455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
457 lc->preempt_count = PREEMPT_DISABLED;
458 lc->kernel_asce = S390_lowcore.kernel_asce;
459 lc->user_asce = S390_lowcore.user_asce;
460
461 system_ctlreg_init_save_area(lc);
462 abs_lc = get_abs_lowcore();
463 abs_lc->restart_stack = lc->restart_stack;
464 abs_lc->restart_fn = lc->restart_fn;
465 abs_lc->restart_data = lc->restart_data;
466 abs_lc->restart_source = lc->restart_source;
467 abs_lc->restart_psw = lc->restart_psw;
468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
469 abs_lc->program_new_psw = lc->program_new_psw;
470 abs_lc->mcesad = lc->mcesad;
471 put_abs_lowcore(abs_lc);
472
473 set_prefix(__pa(lc));
474 lowcore_ptr[0] = lc;
475 if (abs_lowcore_map(0, lowcore_ptr[0], false))
476 panic("Couldn't setup absolute lowcore");
477}
478
479static struct resource code_resource = {
480 .name = "Kernel code",
481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
482};
483
484static struct resource data_resource = {
485 .name = "Kernel data",
486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
487};
488
489static struct resource bss_resource = {
490 .name = "Kernel bss",
491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
492};
493
494static struct resource __initdata *standard_resources[] = {
495 &code_resource,
496 &data_resource,
497 &bss_resource,
498};
499
500static void __init setup_resources(void)
501{
502 struct resource *res, *std_res, *sub_res;
503 phys_addr_t start, end;
504 int j;
505 u64 i;
506
507 code_resource.start = __pa_symbol(_text);
508 code_resource.end = __pa_symbol(_etext) - 1;
509 data_resource.start = __pa_symbol(_etext);
510 data_resource.end = __pa_symbol(_edata) - 1;
511 bss_resource.start = __pa_symbol(__bss_start);
512 bss_resource.end = __pa_symbol(__bss_stop) - 1;
513
514 for_each_mem_range(i, &start, &end) {
515 res = memblock_alloc(sizeof(*res), 8);
516 if (!res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*res), 8);
519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
520
521 res->name = "System RAM";
522 res->start = start;
523 /*
524 * In memblock, end points to the first byte after the
525 * range while in resources, end points to the last byte in
526 * the range.
527 */
528 res->end = end - 1;
529 request_resource(&iomem_resource, res);
530
531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
532 std_res = standard_resources[j];
533 if (std_res->start < res->start ||
534 std_res->start > res->end)
535 continue;
536 if (std_res->end > res->end) {
537 sub_res = memblock_alloc(sizeof(*sub_res), 8);
538 if (!sub_res)
539 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
540 __func__, sizeof(*sub_res), 8);
541 *sub_res = *std_res;
542 sub_res->end = res->end;
543 std_res->start = res->end + 1;
544 request_resource(res, sub_res);
545 } else {
546 request_resource(res, std_res);
547 }
548 }
549 }
550#ifdef CONFIG_CRASH_DUMP
551 /*
552 * Re-add removed crash kernel memory as reserved memory. This makes
553 * sure it will be mapped with the identity mapping and struct pages
554 * will be created, so it can be resized later on.
555 * However add it later since the crash kernel resource should not be
556 * part of the System RAM resource.
557 */
558 if (crashk_res.end) {
559 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
560 0, MEMBLOCK_NONE);
561 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
562 insert_resource(&iomem_resource, &crashk_res);
563 }
564#endif
565}
566
567static void __init setup_memory_end(void)
568{
569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
571}
572
573#ifdef CONFIG_CRASH_DUMP
574
575/*
576 * When kdump is enabled, we have to ensure that no memory from the area
577 * [0 - crashkernel memory size] is set offline - it will be exchanged with
578 * the crashkernel memory region when kdump is triggered. The crashkernel
579 * memory region can never get offlined (pages are unmovable).
580 */
581static int kdump_mem_notifier(struct notifier_block *nb,
582 unsigned long action, void *data)
583{
584 struct memory_notify *arg = data;
585
586 if (action != MEM_GOING_OFFLINE)
587 return NOTIFY_OK;
588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
589 return NOTIFY_BAD;
590 return NOTIFY_OK;
591}
592
593static struct notifier_block kdump_mem_nb = {
594 .notifier_call = kdump_mem_notifier,
595};
596
597#endif
598
599/*
600 * Reserve page tables created by decompressor
601 */
602static void __init reserve_pgtables(void)
603{
604 unsigned long start, end;
605 struct reserved_range *range;
606
607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
608 memblock_reserve(start, end - start);
609}
610
611/*
612 * Reserve memory for kdump kernel to be loaded with kexec
613 */
614static void __init reserve_crashkernel(void)
615{
616#ifdef CONFIG_CRASH_DUMP
617 unsigned long long crash_base, crash_size;
618 phys_addr_t low, high;
619 int rc;
620
621 rc = parse_crashkernel(boot_command_line, ident_map_size,
622 &crash_size, &crash_base, NULL, NULL);
623
624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
626 if (rc || crash_size == 0)
627 return;
628
629 if (memblock.memory.regions[0].size < crash_size) {
630 pr_info("crashkernel reservation failed: %s\n",
631 "first memory chunk must be at least crashkernel size");
632 return;
633 }
634
635 low = crash_base ?: oldmem_data.start;
636 high = low + crash_size;
637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
639 crash_base = low;
640 } else {
641 /* Find suitable area in free memory */
642 low = max_t(unsigned long, crash_size, sclp.hsa_size);
643 high = crash_base ? crash_base + crash_size : ULONG_MAX;
644
645 if (crash_base && crash_base < low) {
646 pr_info("crashkernel reservation failed: %s\n",
647 "crash_base too low");
648 return;
649 }
650 low = crash_base ?: low;
651 crash_base = memblock_phys_alloc_range(crash_size,
652 KEXEC_CRASH_MEM_ALIGN,
653 low, high);
654 }
655
656 if (!crash_base) {
657 pr_info("crashkernel reservation failed: %s\n",
658 "no suitable area found");
659 return;
660 }
661
662 if (register_memory_notifier(&kdump_mem_nb)) {
663 memblock_phys_free(crash_base, crash_size);
664 return;
665 }
666
667 if (!oldmem_data.start && MACHINE_IS_VM)
668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
669 crashk_res.start = crash_base;
670 crashk_res.end = crash_base + crash_size - 1;
671 memblock_remove(crash_base, crash_size);
672 pr_info("Reserving %lluMB of memory at %lluMB "
673 "for crashkernel (System RAM: %luMB)\n",
674 crash_size >> 20, crash_base >> 20,
675 (unsigned long)memblock.memory.total_size >> 20);
676 os_info_crashkernel_add(crash_base, crash_size);
677#endif
678}
679
680/*
681 * Reserve the initrd from being used by memblock
682 */
683static void __init reserve_initrd(void)
684{
685 unsigned long addr, size;
686
687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
688 return;
689 initrd_start = (unsigned long)__va(addr);
690 initrd_end = initrd_start + size;
691 memblock_reserve(addr, size);
692}
693
694/*
695 * Reserve the memory area used to pass the certificate lists
696 */
697static void __init reserve_certificate_list(void)
698{
699 if (ipl_cert_list_addr)
700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
701}
702
703static void __init reserve_physmem_info(void)
704{
705 unsigned long addr, size;
706
707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
708 memblock_reserve(addr, size);
709}
710
711static void __init free_physmem_info(void)
712{
713 unsigned long addr, size;
714
715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
716 memblock_phys_free(addr, size);
717}
718
719static void __init memblock_add_physmem_info(void)
720{
721 unsigned long start, end;
722 int i;
723
724 pr_debug("physmem info source: %s (%hhd)\n",
725 get_physmem_info_source(), physmem_info.info_source);
726 /* keep memblock lists close to the kernel */
727 memblock_set_bottom_up(true);
728 for_each_physmem_usable_range(i, &start, &end)
729 memblock_add(start, end - start);
730 for_each_physmem_online_range(i, &start, &end)
731 memblock_physmem_add(start, end - start);
732 memblock_set_bottom_up(false);
733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
734}
735
736/*
737 * Reserve memory used for lowcore/command line/kernel image.
738 */
739static void __init reserve_kernel(void)
740{
741 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
742 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
743 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
744 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
745 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
746 memblock_reserve(__pa(_stext), _end - _stext);
747}
748
749static void __init setup_memory(void)
750{
751 phys_addr_t start, end;
752 u64 i;
753
754 /*
755 * Init storage key for present memory
756 */
757 for_each_mem_range(i, &start, &end)
758 storage_key_init_range(start, end);
759
760 psw_set_key(PAGE_DEFAULT_KEY);
761}
762
763static void __init relocate_amode31_section(void)
764{
765 unsigned long amode31_size = __eamode31 - __samode31;
766 long amode31_offset, *ptr;
767
768 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31;
769 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
770
771 /* Move original AMODE31 section to the new one */
772 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
773 /* Zero out the old AMODE31 section to catch invalid accesses within it */
774 memset(__samode31, 0, amode31_size);
775
776 /* Update all AMODE31 region references */
777 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
778 *ptr += amode31_offset;
779}
780
781/* This must be called after AMODE31 relocation */
782static void __init setup_cr(void)
783{
784 union ctlreg2 cr2;
785 union ctlreg5 cr5;
786 union ctlreg15 cr15;
787
788 __ctl_duct[1] = (unsigned long)__ctl_aste;
789 __ctl_duct[2] = (unsigned long)__ctl_aste;
790 __ctl_duct[4] = (unsigned long)__ctl_duald;
791
792 /* Update control registers CR2, CR5 and CR15 */
793 local_ctl_store(2, &cr2.reg);
794 local_ctl_store(5, &cr5.reg);
795 local_ctl_store(15, &cr15.reg);
796 cr2.ducto = (unsigned long)__ctl_duct >> 6;
797 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
798 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
799 system_ctl_load(2, &cr2.reg);
800 system_ctl_load(5, &cr5.reg);
801 system_ctl_load(15, &cr15.reg);
802}
803
804/*
805 * Add system information as device randomness
806 */
807static void __init setup_randomness(void)
808{
809 struct sysinfo_3_2_2 *vmms;
810
811 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
812 if (!vmms)
813 panic("Failed to allocate memory for sysinfo structure\n");
814 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
815 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
816 memblock_free(vmms, PAGE_SIZE);
817
818 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
819 static_branch_enable(&s390_arch_random_available);
820}
821
822/*
823 * Issue diagnose 318 to set the control program name and
824 * version codes.
825 */
826static void __init setup_control_program_code(void)
827{
828 union diag318_info diag318_info = {
829 .cpnc = CPNC_LINUX,
830 .cpvc = 0,
831 };
832
833 if (!sclp.has_diag318)
834 return;
835
836 diag_stat_inc(DIAG_STAT_X318);
837 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
838}
839
840/*
841 * Print the component list from the IPL report
842 */
843static void __init log_component_list(void)
844{
845 struct ipl_rb_component_entry *ptr, *end;
846 char *str;
847
848 if (!early_ipl_comp_list_addr)
849 return;
850 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
851 pr_info("Linux is running with Secure-IPL enabled\n");
852 else
853 pr_info("Linux is running with Secure-IPL disabled\n");
854 ptr = __va(early_ipl_comp_list_addr);
855 end = (void *) ptr + early_ipl_comp_list_size;
856 pr_info("The IPL report contains the following components:\n");
857 while (ptr < end) {
858 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
859 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
860 str = "signed, verified";
861 else
862 str = "signed, verification failed";
863 } else {
864 str = "not signed";
865 }
866 pr_info("%016llx - %016llx (%s)\n",
867 ptr->addr, ptr->addr + ptr->len, str);
868 ptr++;
869 }
870}
871
872/*
873 * Setup function called from init/main.c just after the banner
874 * was printed.
875 */
876
877void __init setup_arch(char **cmdline_p)
878{
879 /*
880 * print what head.S has found out about the machine
881 */
882 if (MACHINE_IS_VM)
883 pr_info("Linux is running as a z/VM "
884 "guest operating system in 64-bit mode\n");
885 else if (MACHINE_IS_KVM)
886 pr_info("Linux is running under KVM in 64-bit mode\n");
887 else if (MACHINE_IS_LPAR)
888 pr_info("Linux is running natively in 64-bit mode\n");
889 else
890 pr_info("Linux is running as a guest in 64-bit mode\n");
891
892 log_component_list();
893
894 /* Have one command line that is parsed and saved in /proc/cmdline */
895 /* boot_command_line has been already set up in early.c */
896 *cmdline_p = boot_command_line;
897
898 ROOT_DEV = Root_RAM0;
899
900 setup_initial_init_mm(_text, _etext, _edata, _end);
901
902 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
903 nospec_auto_detect();
904
905 jump_label_init();
906 parse_early_param();
907#ifdef CONFIG_CRASH_DUMP
908 /* Deactivate elfcorehdr= kernel parameter */
909 elfcorehdr_addr = ELFCORE_ADDR_MAX;
910#endif
911
912 os_info_init();
913 setup_ipl();
914 setup_control_program_code();
915
916 /* Do some memory reservations *before* memory is added to memblock */
917 reserve_pgtables();
918 reserve_kernel();
919 reserve_initrd();
920 reserve_certificate_list();
921 reserve_physmem_info();
922 memblock_set_current_limit(ident_map_size);
923 memblock_allow_resize();
924
925 /* Get information about *all* installed memory */
926 memblock_add_physmem_info();
927
928 free_physmem_info();
929 setup_memory_end();
930 memblock_dump_all();
931 setup_memory();
932
933 relocate_amode31_section();
934 setup_cr();
935 setup_uv();
936 dma_contiguous_reserve(ident_map_size);
937 vmcp_cma_reserve();
938 if (MACHINE_HAS_EDAT2)
939 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
940
941 reserve_crashkernel();
942#ifdef CONFIG_CRASH_DUMP
943 /*
944 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
945 * Therefore CPU and device initialization should be done afterwards.
946 */
947 smp_save_dump_secondary_cpus();
948#endif
949
950 setup_resources();
951 setup_lowcore();
952 smp_fill_possible_mask();
953 cpu_detect_mhz_feature();
954 cpu_init();
955 numa_setup();
956 smp_detect_cpus();
957 topology_init_early();
958
959 if (test_facility(193))
960 static_branch_enable(&cpu_has_bear);
961
962 /*
963 * Create kernel page tables.
964 */
965 paging_init();
966
967 /*
968 * After paging_init created the kernel page table, the new PSWs
969 * in lowcore can now run with DAT enabled.
970 */
971#ifdef CONFIG_CRASH_DUMP
972 smp_save_dump_ipl_cpu();
973#endif
974
975 /* Setup default console */
976 conmode_default();
977 set_preferred_console();
978
979 apply_alternative_instructions();
980 if (IS_ENABLED(CONFIG_EXPOLINE))
981 nospec_init_branches();
982
983 /* Setup zfcp/nvme dump support */
984 setup_zfcpdump();
985
986 /* Add system specific data to the random pool */
987 setup_randomness();
988}