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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/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);
149struct physmem_info __bootdata(physmem_info);
150
151struct vm_layout __bootdata_preserved(vm_layout);
152EXPORT_SYMBOL(vm_layout);
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);
158struct oldmem_data __bootdata_preserved(oldmem_data);
159
160unsigned long VMALLOC_START;
161EXPORT_SYMBOL(VMALLOC_START);
162
163unsigned long VMALLOC_END;
164EXPORT_SYMBOL(VMALLOC_END);
165
166struct page *vmemmap;
167EXPORT_SYMBOL(vmemmap);
168unsigned long vmemmap_size;
169
170unsigned long MODULES_VADDR;
171unsigned long MODULES_END;
172
173/* An array with a pointer to the lowcore of every CPU. */
174struct lowcore *lowcore_ptr[NR_CPUS];
175EXPORT_SYMBOL(lowcore_ptr);
176
177DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
178
179/*
180 * The Write Back bit position in the physaddr is given by the SLPC PCI.
181 * Leaving the mask zero always uses write through which is safe
182 */
183unsigned long mio_wb_bit_mask __ro_after_init;
184
185/*
186 * This is set up by the setup-routine at boot-time
187 * for S390 need to find out, what we have to setup
188 * using address 0x10400 ...
189 */
190
191#include <asm/setup.h>
192
193/*
194 * condev= and conmode= setup parameter.
195 */
196
197static int __init condev_setup(char *str)
198{
199 int vdev;
200
201 vdev = simple_strtoul(str, &str, 0);
202 if (vdev >= 0 && vdev < 65536) {
203 console_devno = vdev;
204 console_irq = -1;
205 }
206 return 1;
207}
208
209__setup("condev=", condev_setup);
210
211static void __init set_preferred_console(void)
212{
213 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
214 add_preferred_console("ttyS", 0, NULL);
215 else if (CONSOLE_IS_3270)
216 add_preferred_console("tty3270", 0, NULL);
217 else if (CONSOLE_IS_VT220)
218 add_preferred_console("ttysclp", 0, NULL);
219 else if (CONSOLE_IS_HVC)
220 add_preferred_console("hvc", 0, NULL);
221}
222
223static int __init conmode_setup(char *str)
224{
225#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
226 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
227 SET_CONSOLE_SCLP;
228#endif
229#if defined(CONFIG_TN3215_CONSOLE)
230 if (!strcmp(str, "3215"))
231 SET_CONSOLE_3215;
232#endif
233#if defined(CONFIG_TN3270_CONSOLE)
234 if (!strcmp(str, "3270"))
235 SET_CONSOLE_3270;
236#endif
237 set_preferred_console();
238 return 1;
239}
240
241__setup("conmode=", conmode_setup);
242
243static void __init conmode_default(void)
244{
245 char query_buffer[1024];
246 char *ptr;
247
248 if (MACHINE_IS_VM) {
249 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
250 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
251 ptr = strstr(query_buffer, "SUBCHANNEL =");
252 console_irq = simple_strtoul(ptr + 13, NULL, 16);
253 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
254 ptr = strstr(query_buffer, "CONMODE");
255 /*
256 * Set the conmode to 3215 so that the device recognition
257 * will set the cu_type of the console to 3215. If the
258 * conmode is 3270 and we don't set it back then both
259 * 3215 and the 3270 driver will try to access the console
260 * device (3215 as console and 3270 as normal tty).
261 */
262 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
263 if (ptr == NULL) {
264#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
265 SET_CONSOLE_SCLP;
266#endif
267 return;
268 }
269 if (str_has_prefix(ptr + 8, "3270")) {
270#if defined(CONFIG_TN3270_CONSOLE)
271 SET_CONSOLE_3270;
272#elif defined(CONFIG_TN3215_CONSOLE)
273 SET_CONSOLE_3215;
274#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
275 SET_CONSOLE_SCLP;
276#endif
277 } else if (str_has_prefix(ptr + 8, "3215")) {
278#if defined(CONFIG_TN3215_CONSOLE)
279 SET_CONSOLE_3215;
280#elif defined(CONFIG_TN3270_CONSOLE)
281 SET_CONSOLE_3270;
282#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
283 SET_CONSOLE_SCLP;
284#endif
285 }
286 } else if (MACHINE_IS_KVM) {
287 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
288 SET_CONSOLE_VT220;
289 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
290 SET_CONSOLE_SCLP;
291 else
292 SET_CONSOLE_HVC;
293 } else {
294#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
295 SET_CONSOLE_SCLP;
296#endif
297 }
298}
299
300#ifdef CONFIG_CRASH_DUMP
301static void __init setup_zfcpdump(void)
302{
303 if (!is_ipl_type_dump())
304 return;
305 if (oldmem_data.start)
306 return;
307 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
308 console_loglevel = 2;
309}
310#else
311static inline void setup_zfcpdump(void) {}
312#endif /* CONFIG_CRASH_DUMP */
313
314 /*
315 * Reboot, halt and power_off stubs. They just call _machine_restart,
316 * _machine_halt or _machine_power_off.
317 */
318
319void machine_restart(char *command)
320{
321 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
322 /*
323 * Only unblank the console if we are called in enabled
324 * context or a bust_spinlocks cleared the way for us.
325 */
326 console_unblank();
327 _machine_restart(command);
328}
329
330void machine_halt(void)
331{
332 if (!in_interrupt() || oops_in_progress)
333 /*
334 * Only unblank the console if we are called in enabled
335 * context or a bust_spinlocks cleared the way for us.
336 */
337 console_unblank();
338 _machine_halt();
339}
340
341void machine_power_off(void)
342{
343 if (!in_interrupt() || oops_in_progress)
344 /*
345 * Only unblank the console if we are called in enabled
346 * context or a bust_spinlocks cleared the way for us.
347 */
348 console_unblank();
349 _machine_power_off();
350}
351
352/*
353 * Dummy power off function.
354 */
355void (*pm_power_off)(void) = machine_power_off;
356EXPORT_SYMBOL_GPL(pm_power_off);
357
358void *restart_stack;
359
360unsigned long stack_alloc(void)
361{
362#ifdef CONFIG_VMAP_STACK
363 void *ret;
364
365 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
366 NUMA_NO_NODE, __builtin_return_address(0));
367 kmemleak_not_leak(ret);
368 return (unsigned long)ret;
369#else
370 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
371#endif
372}
373
374void stack_free(unsigned long stack)
375{
376#ifdef CONFIG_VMAP_STACK
377 vfree((void *) stack);
378#else
379 free_pages(stack, THREAD_SIZE_ORDER);
380#endif
381}
382
383static unsigned long __init stack_alloc_early(void)
384{
385 unsigned long stack;
386
387 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
388 if (!stack) {
389 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
390 __func__, THREAD_SIZE, THREAD_SIZE);
391 }
392 return stack;
393}
394
395static void __init setup_lowcore(void)
396{
397 struct lowcore *lc, *abs_lc;
398
399 /*
400 * Setup lowcore for boot cpu
401 */
402 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
403 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
404 if (!lc)
405 panic("%s: Failed to allocate %zu bytes align=%zx\n",
406 __func__, sizeof(*lc), sizeof(*lc));
407
408 lc->pcpu = (unsigned long)per_cpu_ptr(&pcpu_devices, 0);
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 = get_lowcore()->machine_flags;
425 lc->preempt_count = get_lowcore()->preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = get_lowcore()->sys_enter_timer;
428 lc->exit_timer = get_lowcore()->exit_timer;
429 lc->user_timer = get_lowcore()->user_timer;
430 lc->system_timer = get_lowcore()->system_timer;
431 lc->steal_timer = get_lowcore()->steal_timer;
432 lc->last_update_timer = get_lowcore()->last_update_timer;
433 lc->last_update_clock = get_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 = get_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 = get_lowcore()->kernel_asce;
459 lc->user_asce = get_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.
738 */
739static void __init reserve_lowcore(void)
740{
741 void *lowcore_start = get_lowcore();
742 void *lowcore_end = lowcore_start + sizeof(struct lowcore);
743 void *start, *end;
744
745 if ((void *)__identity_base < lowcore_end) {
746 start = max(lowcore_start, (void *)__identity_base);
747 end = min(lowcore_end, (void *)(__identity_base + ident_map_size));
748 memblock_reserve(__pa(start), __pa(end));
749 }
750}
751
752/*
753 * Reserve memory used for absolute lowcore/command line/kernel image.
754 */
755static void __init reserve_kernel(void)
756{
757 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
758 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
759 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
760 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
761 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
762 memblock_reserve(__pa(_stext), _end - _stext);
763}
764
765static void __init setup_memory(void)
766{
767 phys_addr_t start, end;
768 u64 i;
769
770 /*
771 * Init storage key for present memory
772 */
773 for_each_mem_range(i, &start, &end)
774 storage_key_init_range(start, end);
775
776 psw_set_key(PAGE_DEFAULT_KEY);
777}
778
779static void __init relocate_amode31_section(void)
780{
781 unsigned long amode31_size = __eamode31 - __samode31;
782 long amode31_offset, *ptr;
783
784 amode31_offset = AMODE31_START - (unsigned long)__samode31;
785 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
786
787 /* Move original AMODE31 section to the new one */
788 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
789 /* Zero out the old AMODE31 section to catch invalid accesses within it */
790 memset(__samode31, 0, amode31_size);
791
792 /* Update all AMODE31 region references */
793 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
794 *ptr += amode31_offset;
795}
796
797/* This must be called after AMODE31 relocation */
798static void __init setup_cr(void)
799{
800 union ctlreg2 cr2;
801 union ctlreg5 cr5;
802 union ctlreg15 cr15;
803
804 __ctl_duct[1] = (unsigned long)__ctl_aste;
805 __ctl_duct[2] = (unsigned long)__ctl_aste;
806 __ctl_duct[4] = (unsigned long)__ctl_duald;
807
808 /* Update control registers CR2, CR5 and CR15 */
809 local_ctl_store(2, &cr2.reg);
810 local_ctl_store(5, &cr5.reg);
811 local_ctl_store(15, &cr15.reg);
812 cr2.ducto = (unsigned long)__ctl_duct >> 6;
813 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
814 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
815 system_ctl_load(2, &cr2.reg);
816 system_ctl_load(5, &cr5.reg);
817 system_ctl_load(15, &cr15.reg);
818}
819
820/*
821 * Add system information as device randomness
822 */
823static void __init setup_randomness(void)
824{
825 struct sysinfo_3_2_2 *vmms;
826
827 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
828 if (!vmms)
829 panic("Failed to allocate memory for sysinfo structure\n");
830 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
831 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
832 memblock_free(vmms, PAGE_SIZE);
833
834 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
835 static_branch_enable(&s390_arch_random_available);
836}
837
838/*
839 * Issue diagnose 318 to set the control program name and
840 * version codes.
841 */
842static void __init setup_control_program_code(void)
843{
844 union diag318_info diag318_info = {
845 .cpnc = CPNC_LINUX,
846 .cpvc = 0,
847 };
848
849 if (!sclp.has_diag318)
850 return;
851
852 diag_stat_inc(DIAG_STAT_X318);
853 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
854}
855
856/*
857 * Print the component list from the IPL report
858 */
859static void __init log_component_list(void)
860{
861 struct ipl_rb_component_entry *ptr, *end;
862 char *str;
863
864 if (!early_ipl_comp_list_addr)
865 return;
866 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
867 pr_info("Linux is running with Secure-IPL enabled\n");
868 else
869 pr_info("Linux is running with Secure-IPL disabled\n");
870 ptr = __va(early_ipl_comp_list_addr);
871 end = (void *) ptr + early_ipl_comp_list_size;
872 pr_info("The IPL report contains the following components:\n");
873 while (ptr < end) {
874 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
875 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
876 str = "signed, verified";
877 else
878 str = "signed, verification failed";
879 } else {
880 str = "not signed";
881 }
882 pr_info("%016llx - %016llx (%s)\n",
883 ptr->addr, ptr->addr + ptr->len, str);
884 ptr++;
885 }
886}
887
888/*
889 * Setup function called from init/main.c just after the banner
890 * was printed.
891 */
892
893void __init setup_arch(char **cmdline_p)
894{
895 /*
896 * print what head.S has found out about the machine
897 */
898 if (MACHINE_IS_VM)
899 pr_info("Linux is running as a z/VM "
900 "guest operating system in 64-bit mode\n");
901 else if (MACHINE_IS_KVM)
902 pr_info("Linux is running under KVM in 64-bit mode\n");
903 else if (MACHINE_IS_LPAR)
904 pr_info("Linux is running natively in 64-bit mode\n");
905 else
906 pr_info("Linux is running as a guest in 64-bit mode\n");
907
908 if (have_relocated_lowcore())
909 pr_info("Lowcore relocated to 0x%px\n", get_lowcore());
910
911 log_component_list();
912
913 /* Have one command line that is parsed and saved in /proc/cmdline */
914 /* boot_command_line has been already set up in early.c */
915 *cmdline_p = boot_command_line;
916
917 ROOT_DEV = Root_RAM0;
918
919 setup_initial_init_mm(_text, _etext, _edata, _end);
920
921 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
922 nospec_auto_detect();
923
924 jump_label_init();
925 parse_early_param();
926#ifdef CONFIG_CRASH_DUMP
927 /* Deactivate elfcorehdr= kernel parameter */
928 elfcorehdr_addr = ELFCORE_ADDR_MAX;
929#endif
930
931 os_info_init();
932 setup_ipl();
933 setup_control_program_code();
934
935 /* Do some memory reservations *before* memory is added to memblock */
936 reserve_pgtables();
937 reserve_lowcore();
938 reserve_kernel();
939 reserve_initrd();
940 reserve_certificate_list();
941 reserve_physmem_info();
942 memblock_set_current_limit(ident_map_size);
943 memblock_allow_resize();
944
945 /* Get information about *all* installed memory */
946 memblock_add_physmem_info();
947
948 free_physmem_info();
949 setup_memory_end();
950 memblock_dump_all();
951 setup_memory();
952
953 relocate_amode31_section();
954 setup_cr();
955 setup_uv();
956 dma_contiguous_reserve(ident_map_size);
957 vmcp_cma_reserve();
958 if (MACHINE_HAS_EDAT2)
959 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
960
961 reserve_crashkernel();
962#ifdef CONFIG_CRASH_DUMP
963 /*
964 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
965 * Therefore CPU and device initialization should be done afterwards.
966 */
967 smp_save_dump_secondary_cpus();
968#endif
969
970 setup_resources();
971 setup_lowcore();
972 smp_fill_possible_mask();
973 cpu_detect_mhz_feature();
974 cpu_init();
975 numa_setup();
976 smp_detect_cpus();
977 topology_init_early();
978
979 if (test_facility(193))
980 static_branch_enable(&cpu_has_bear);
981
982 /*
983 * Create kernel page tables.
984 */
985 paging_init();
986
987 /*
988 * After paging_init created the kernel page table, the new PSWs
989 * in lowcore can now run with DAT enabled.
990 */
991#ifdef CONFIG_CRASH_DUMP
992 smp_save_dump_ipl_cpu();
993#endif
994
995 /* Setup default console */
996 conmode_default();
997 set_preferred_console();
998
999 apply_alternative_instructions();
1000 if (IS_ENABLED(CONFIG_EXPOLINE))
1001 nospec_init_branches();
1002
1003 /* Setup zfcp/nvme dump support */
1004 setup_zfcpdump();
1005
1006 /* Add system specific data to the random pool */
1007 setup_randomness();
1008}
1009
1010void __init arch_cpu_finalize_init(void)
1011{
1012 sclp_init();
1013}
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/boot_data.h>
56#include <asm/ipl.h>
57#include <asm/facility.h>
58#include <asm/smp.h>
59#include <asm/mmu_context.h>
60#include <asm/cpcmd.h>
61#include <asm/lowcore.h>
62#include <asm/nmi.h>
63#include <asm/irq.h>
64#include <asm/page.h>
65#include <asm/ptrace.h>
66#include <asm/sections.h>
67#include <asm/ebcdic.h>
68#include <asm/diag.h>
69#include <asm/os_info.h>
70#include <asm/sclp.h>
71#include <asm/stacktrace.h>
72#include <asm/sysinfo.h>
73#include <asm/numa.h>
74#include <asm/alternative.h>
75#include <asm/nospec-branch.h>
76#include <asm/mem_detect.h>
77#include <asm/uv.h>
78#include <asm/asm-offsets.h>
79#include "entry.h"
80
81/*
82 * Machine setup..
83 */
84unsigned int console_mode = 0;
85EXPORT_SYMBOL(console_mode);
86
87unsigned int console_devno = -1;
88EXPORT_SYMBOL(console_devno);
89
90unsigned int console_irq = -1;
91EXPORT_SYMBOL(console_irq);
92
93unsigned long elf_hwcap __read_mostly = 0;
94char elf_platform[ELF_PLATFORM_SIZE];
95
96unsigned long int_hwcap = 0;
97
98int __bootdata(noexec_disabled);
99unsigned long __bootdata(ident_map_size);
100struct mem_detect_info __bootdata(mem_detect);
101
102struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
103struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
104unsigned long __bootdata_preserved(__stext_dma);
105unsigned long __bootdata_preserved(__etext_dma);
106unsigned long __bootdata_preserved(__sdma);
107unsigned long __bootdata_preserved(__edma);
108unsigned long __bootdata_preserved(__kaslr_offset);
109unsigned int __bootdata_preserved(zlib_dfltcc_support);
110EXPORT_SYMBOL(zlib_dfltcc_support);
111u64 __bootdata_preserved(stfle_fac_list[16]);
112EXPORT_SYMBOL(stfle_fac_list);
113u64 __bootdata_preserved(alt_stfle_fac_list[16]);
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);
123unsigned long vmemmap_size;
124
125unsigned long MODULES_VADDR;
126unsigned long MODULES_END;
127
128/* An array with a pointer to the lowcore of every CPU. */
129struct lowcore *lowcore_ptr[NR_CPUS];
130EXPORT_SYMBOL(lowcore_ptr);
131
132/*
133 * The Write Back bit position in the physaddr is given by the SLPC PCI.
134 * Leaving the mask zero always uses write through which is safe
135 */
136unsigned long mio_wb_bit_mask __ro_after_init;
137
138/*
139 * This is set up by the setup-routine at boot-time
140 * for S390 need to find out, what we have to setup
141 * using address 0x10400 ...
142 */
143
144#include <asm/setup.h>
145
146/*
147 * condev= and conmode= setup parameter.
148 */
149
150static int __init condev_setup(char *str)
151{
152 int vdev;
153
154 vdev = simple_strtoul(str, &str, 0);
155 if (vdev >= 0 && vdev < 65536) {
156 console_devno = vdev;
157 console_irq = -1;
158 }
159 return 1;
160}
161
162__setup("condev=", condev_setup);
163
164static void __init set_preferred_console(void)
165{
166 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
167 add_preferred_console("ttyS", 0, NULL);
168 else if (CONSOLE_IS_3270)
169 add_preferred_console("tty3270", 0, NULL);
170 else if (CONSOLE_IS_VT220)
171 add_preferred_console("ttysclp", 0, NULL);
172 else if (CONSOLE_IS_HVC)
173 add_preferred_console("hvc", 0, NULL);
174}
175
176static int __init conmode_setup(char *str)
177{
178#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
179 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
180 SET_CONSOLE_SCLP;
181#endif
182#if defined(CONFIG_TN3215_CONSOLE)
183 if (!strcmp(str, "3215"))
184 SET_CONSOLE_3215;
185#endif
186#if defined(CONFIG_TN3270_CONSOLE)
187 if (!strcmp(str, "3270"))
188 SET_CONSOLE_3270;
189#endif
190 set_preferred_console();
191 return 1;
192}
193
194__setup("conmode=", conmode_setup);
195
196static void __init conmode_default(void)
197{
198 char query_buffer[1024];
199 char *ptr;
200
201 if (MACHINE_IS_VM) {
202 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
203 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
204 ptr = strstr(query_buffer, "SUBCHANNEL =");
205 console_irq = simple_strtoul(ptr + 13, NULL, 16);
206 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
207 ptr = strstr(query_buffer, "CONMODE");
208 /*
209 * Set the conmode to 3215 so that the device recognition
210 * will set the cu_type of the console to 3215. If the
211 * conmode is 3270 and we don't set it back then both
212 * 3215 and the 3270 driver will try to access the console
213 * device (3215 as console and 3270 as normal tty).
214 */
215 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
216 if (ptr == NULL) {
217#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
218 SET_CONSOLE_SCLP;
219#endif
220 return;
221 }
222 if (str_has_prefix(ptr + 8, "3270")) {
223#if defined(CONFIG_TN3270_CONSOLE)
224 SET_CONSOLE_3270;
225#elif defined(CONFIG_TN3215_CONSOLE)
226 SET_CONSOLE_3215;
227#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 } else if (str_has_prefix(ptr + 8, "3215")) {
231#if defined(CONFIG_TN3215_CONSOLE)
232 SET_CONSOLE_3215;
233#elif defined(CONFIG_TN3270_CONSOLE)
234 SET_CONSOLE_3270;
235#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
236 SET_CONSOLE_SCLP;
237#endif
238 }
239 } else if (MACHINE_IS_KVM) {
240 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
241 SET_CONSOLE_VT220;
242 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
243 SET_CONSOLE_SCLP;
244 else
245 SET_CONSOLE_HVC;
246 } else {
247#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
248 SET_CONSOLE_SCLP;
249#endif
250 }
251}
252
253#ifdef CONFIG_CRASH_DUMP
254static void __init setup_zfcpdump(void)
255{
256 if (!is_ipl_type_dump())
257 return;
258 if (OLDMEM_BASE)
259 return;
260 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
261 console_loglevel = 2;
262}
263#else
264static inline void setup_zfcpdump(void) {}
265#endif /* CONFIG_CRASH_DUMP */
266
267 /*
268 * Reboot, halt and power_off stubs. They just call _machine_restart,
269 * _machine_halt or _machine_power_off.
270 */
271
272void machine_restart(char *command)
273{
274 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
275 /*
276 * Only unblank the console if we are called in enabled
277 * context or a bust_spinlocks cleared the way for us.
278 */
279 console_unblank();
280 _machine_restart(command);
281}
282
283void machine_halt(void)
284{
285 if (!in_interrupt() || oops_in_progress)
286 /*
287 * Only unblank the console if we are called in enabled
288 * context or a bust_spinlocks cleared the way for us.
289 */
290 console_unblank();
291 _machine_halt();
292}
293
294void machine_power_off(void)
295{
296 if (!in_interrupt() || oops_in_progress)
297 /*
298 * Only unblank the console if we are called in enabled
299 * context or a bust_spinlocks cleared the way for us.
300 */
301 console_unblank();
302 _machine_power_off();
303}
304
305/*
306 * Dummy power off function.
307 */
308void (*pm_power_off)(void) = machine_power_off;
309EXPORT_SYMBOL_GPL(pm_power_off);
310
311void *restart_stack;
312
313unsigned long stack_alloc(void)
314{
315#ifdef CONFIG_VMAP_STACK
316 void *ret;
317
318 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
319 NUMA_NO_NODE, __builtin_return_address(0));
320 kmemleak_not_leak(ret);
321 return (unsigned long)ret;
322#else
323 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
324#endif
325}
326
327void stack_free(unsigned long stack)
328{
329#ifdef CONFIG_VMAP_STACK
330 vfree((void *) stack);
331#else
332 free_pages(stack, THREAD_SIZE_ORDER);
333#endif
334}
335
336int __init arch_early_irq_init(void)
337{
338 unsigned long stack;
339
340 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
341 if (!stack)
342 panic("Couldn't allocate async stack");
343 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
344 return 0;
345}
346
347void __init arch_call_rest_init(void)
348{
349 unsigned long stack;
350
351 stack = stack_alloc();
352 if (!stack)
353 panic("Couldn't allocate kernel stack");
354 current->stack = (void *) stack;
355#ifdef CONFIG_VMAP_STACK
356 current->stack_vm_area = (void *) stack;
357#endif
358 set_task_stack_end_magic(current);
359 stack += STACK_INIT_OFFSET;
360 S390_lowcore.kernel_stack = stack;
361 call_on_stack_noreturn(rest_init, stack);
362}
363
364static void __init setup_lowcore_dat_off(void)
365{
366 unsigned long int_psw_mask = PSW_KERNEL_BITS;
367 unsigned long mcck_stack;
368 struct lowcore *lc;
369
370 if (IS_ENABLED(CONFIG_KASAN))
371 int_psw_mask |= PSW_MASK_DAT;
372
373 /*
374 * Setup lowcore for boot cpu
375 */
376 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
377 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
378 if (!lc)
379 panic("%s: Failed to allocate %zu bytes align=%zx\n",
380 __func__, sizeof(*lc), sizeof(*lc));
381
382 lc->restart_psw.mask = PSW_KERNEL_BITS;
383 lc->restart_psw.addr = (unsigned long) restart_int_handler;
384 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
385 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
386 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
387 lc->svc_new_psw.addr = (unsigned long) system_call;
388 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
389 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
390 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
391 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
392 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
393 lc->io_new_psw.addr = (unsigned long) io_int_handler;
394 lc->clock_comparator = clock_comparator_max;
395 lc->nodat_stack = ((unsigned long) &init_thread_union)
396 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
397 lc->current_task = (unsigned long)&init_task;
398 lc->lpp = LPP_MAGIC;
399 lc->machine_flags = S390_lowcore.machine_flags;
400 lc->preempt_count = S390_lowcore.preempt_count;
401 nmi_alloc_boot_cpu(lc);
402 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
403 lc->exit_timer = S390_lowcore.exit_timer;
404 lc->user_timer = S390_lowcore.user_timer;
405 lc->system_timer = S390_lowcore.system_timer;
406 lc->steal_timer = S390_lowcore.steal_timer;
407 lc->last_update_timer = S390_lowcore.last_update_timer;
408 lc->last_update_clock = S390_lowcore.last_update_clock;
409
410 /*
411 * Allocate the global restart stack which is the same for
412 * all CPUs in cast *one* of them does a PSW restart.
413 */
414 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
415 if (!restart_stack)
416 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
417 __func__, THREAD_SIZE, THREAD_SIZE);
418 restart_stack += STACK_INIT_OFFSET;
419
420 /*
421 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
422 * restart data to the absolute zero lowcore. This is necessary if
423 * PSW restart is done on an offline CPU that has lowcore zero.
424 */
425 lc->restart_stack = (unsigned long) restart_stack;
426 lc->restart_fn = (unsigned long) do_restart;
427 lc->restart_data = 0;
428 lc->restart_source = -1U;
429
430 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
431 if (!mcck_stack)
432 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
433 __func__, THREAD_SIZE, THREAD_SIZE);
434 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
435
436 /* Setup absolute zero lowcore */
437 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
438 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
439 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
440 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
441 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
442
443 lc->spinlock_lockval = arch_spin_lockval(0);
444 lc->spinlock_index = 0;
445 arch_spin_lock_setup(0);
446 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
447 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
448 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
449 lc->preempt_count = PREEMPT_DISABLED;
450
451 set_prefix((u32)(unsigned long) lc);
452 lowcore_ptr[0] = lc;
453}
454
455static void __init setup_lowcore_dat_on(void)
456{
457 struct lowcore *lc = lowcore_ptr[0];
458
459 __ctl_clear_bit(0, 28);
460 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
461 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
462 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
463 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
464 __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
465 __ctl_set_bit(0, 28);
466 mem_assign_absolute(S390_lowcore.restart_flags, RESTART_FLAG_CTLREGS);
467 mem_assign_absolute(S390_lowcore.program_new_psw, lc->program_new_psw);
468 memcpy_absolute(&S390_lowcore.cregs_save_area, lc->cregs_save_area,
469 sizeof(S390_lowcore.cregs_save_area));
470}
471
472static struct resource code_resource = {
473 .name = "Kernel code",
474 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
475};
476
477static struct resource data_resource = {
478 .name = "Kernel data",
479 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
480};
481
482static struct resource bss_resource = {
483 .name = "Kernel bss",
484 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
485};
486
487static struct resource __initdata *standard_resources[] = {
488 &code_resource,
489 &data_resource,
490 &bss_resource,
491};
492
493static void __init setup_resources(void)
494{
495 struct resource *res, *std_res, *sub_res;
496 phys_addr_t start, end;
497 int j;
498 u64 i;
499
500 code_resource.start = (unsigned long) _text;
501 code_resource.end = (unsigned long) _etext - 1;
502 data_resource.start = (unsigned long) _etext;
503 data_resource.end = (unsigned long) _edata - 1;
504 bss_resource.start = (unsigned long) __bss_start;
505 bss_resource.end = (unsigned long) __bss_stop - 1;
506
507 for_each_mem_range(i, &start, &end) {
508 res = memblock_alloc(sizeof(*res), 8);
509 if (!res)
510 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
511 __func__, sizeof(*res), 8);
512 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
513
514 res->name = "System RAM";
515 res->start = start;
516 /*
517 * In memblock, end points to the first byte after the
518 * range while in resourses, end points to the last byte in
519 * the range.
520 */
521 res->end = end - 1;
522 request_resource(&iomem_resource, res);
523
524 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
525 std_res = standard_resources[j];
526 if (std_res->start < res->start ||
527 std_res->start > res->end)
528 continue;
529 if (std_res->end > res->end) {
530 sub_res = memblock_alloc(sizeof(*sub_res), 8);
531 if (!sub_res)
532 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
533 __func__, sizeof(*sub_res), 8);
534 *sub_res = *std_res;
535 sub_res->end = res->end;
536 std_res->start = res->end + 1;
537 request_resource(res, sub_res);
538 } else {
539 request_resource(res, std_res);
540 }
541 }
542 }
543#ifdef CONFIG_CRASH_DUMP
544 /*
545 * Re-add removed crash kernel memory as reserved memory. This makes
546 * sure it will be mapped with the identity mapping and struct pages
547 * will be created, so it can be resized later on.
548 * However add it later since the crash kernel resource should not be
549 * part of the System RAM resource.
550 */
551 if (crashk_res.end) {
552 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
553 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
554 insert_resource(&iomem_resource, &crashk_res);
555 }
556#endif
557}
558
559static void __init setup_memory_end(void)
560{
561 memblock_remove(ident_map_size, ULONG_MAX);
562 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
563 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
564}
565
566#ifdef CONFIG_CRASH_DUMP
567
568/*
569 * When kdump is enabled, we have to ensure that no memory from the area
570 * [0 - crashkernel memory size] is set offline - it will be exchanged with
571 * the crashkernel memory region when kdump is triggered. The crashkernel
572 * memory region can never get offlined (pages are unmovable).
573 */
574static int kdump_mem_notifier(struct notifier_block *nb,
575 unsigned long action, void *data)
576{
577 struct memory_notify *arg = data;
578
579 if (action != MEM_GOING_OFFLINE)
580 return NOTIFY_OK;
581 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
582 return NOTIFY_BAD;
583 return NOTIFY_OK;
584}
585
586static struct notifier_block kdump_mem_nb = {
587 .notifier_call = kdump_mem_notifier,
588};
589
590#endif
591
592/*
593 * Make sure that the area above identity mapping is protected
594 */
595static void __init reserve_above_ident_map(void)
596{
597 memblock_reserve(ident_map_size, ULONG_MAX);
598}
599
600/*
601 * Reserve memory for kdump kernel to be loaded with kexec
602 */
603static void __init reserve_crashkernel(void)
604{
605#ifdef CONFIG_CRASH_DUMP
606 unsigned long long crash_base, crash_size;
607 phys_addr_t low, high;
608 int rc;
609
610 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
611 &crash_base);
612
613 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
614 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
615 if (rc || crash_size == 0)
616 return;
617
618 if (memblock.memory.regions[0].size < crash_size) {
619 pr_info("crashkernel reservation failed: %s\n",
620 "first memory chunk must be at least crashkernel size");
621 return;
622 }
623
624 low = crash_base ?: OLDMEM_BASE;
625 high = low + crash_size;
626 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
627 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
628 crash_base = low;
629 } else {
630 /* Find suitable area in free memory */
631 low = max_t(unsigned long, crash_size, sclp.hsa_size);
632 high = crash_base ? crash_base + crash_size : ULONG_MAX;
633
634 if (crash_base && crash_base < low) {
635 pr_info("crashkernel reservation failed: %s\n",
636 "crash_base too low");
637 return;
638 }
639 low = crash_base ?: low;
640 crash_base = memblock_find_in_range(low, high, crash_size,
641 KEXEC_CRASH_MEM_ALIGN);
642 }
643
644 if (!crash_base) {
645 pr_info("crashkernel reservation failed: %s\n",
646 "no suitable area found");
647 return;
648 }
649
650 if (register_memory_notifier(&kdump_mem_nb))
651 return;
652
653 if (!OLDMEM_BASE && MACHINE_IS_VM)
654 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
655 crashk_res.start = crash_base;
656 crashk_res.end = crash_base + crash_size - 1;
657 memblock_remove(crash_base, crash_size);
658 pr_info("Reserving %lluMB of memory at %lluMB "
659 "for crashkernel (System RAM: %luMB)\n",
660 crash_size >> 20, crash_base >> 20,
661 (unsigned long)memblock.memory.total_size >> 20);
662 os_info_crashkernel_add(crash_base, crash_size);
663#endif
664}
665
666/*
667 * Reserve the initrd from being used by memblock
668 */
669static void __init reserve_initrd(void)
670{
671#ifdef CONFIG_BLK_DEV_INITRD
672 if (!INITRD_START || !INITRD_SIZE)
673 return;
674 initrd_start = INITRD_START;
675 initrd_end = initrd_start + INITRD_SIZE;
676 memblock_reserve(INITRD_START, INITRD_SIZE);
677#endif
678}
679
680/*
681 * Reserve the memory area used to pass the certificate lists
682 */
683static void __init reserve_certificate_list(void)
684{
685 if (ipl_cert_list_addr)
686 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
687}
688
689static void __init reserve_mem_detect_info(void)
690{
691 unsigned long start, size;
692
693 get_mem_detect_reserved(&start, &size);
694 if (size)
695 memblock_reserve(start, size);
696}
697
698static void __init free_mem_detect_info(void)
699{
700 unsigned long start, size;
701
702 get_mem_detect_reserved(&start, &size);
703 if (size)
704 memblock_free(start, size);
705}
706
707static const char * __init get_mem_info_source(void)
708{
709 switch (mem_detect.info_source) {
710 case MEM_DETECT_SCLP_STOR_INFO:
711 return "sclp storage info";
712 case MEM_DETECT_DIAG260:
713 return "diag260";
714 case MEM_DETECT_SCLP_READ_INFO:
715 return "sclp read info";
716 case MEM_DETECT_BIN_SEARCH:
717 return "binary search";
718 }
719 return "none";
720}
721
722static void __init memblock_add_mem_detect_info(void)
723{
724 unsigned long start, end;
725 int i;
726
727 pr_debug("physmem info source: %s (%hhd)\n",
728 get_mem_info_source(), mem_detect.info_source);
729 /* keep memblock lists close to the kernel */
730 memblock_set_bottom_up(true);
731 for_each_mem_detect_block(i, &start, &end) {
732 memblock_add(start, end - start);
733 memblock_physmem_add(start, end - start);
734 }
735 memblock_set_bottom_up(false);
736 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
737 memblock_dump_all();
738}
739
740/*
741 * Check for initrd being in usable memory
742 */
743static void __init check_initrd(void)
744{
745#ifdef CONFIG_BLK_DEV_INITRD
746 if (INITRD_START && INITRD_SIZE &&
747 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
748 pr_err("The initial RAM disk does not fit into the memory\n");
749 memblock_free(INITRD_START, INITRD_SIZE);
750 initrd_start = initrd_end = 0;
751 }
752#endif
753}
754
755/*
756 * Reserve memory used for lowcore/command line/kernel image.
757 */
758static void __init reserve_kernel(void)
759{
760 unsigned long start_pfn = PFN_UP(__pa(_end));
761
762 memblock_reserve(0, HEAD_END);
763 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
764 - (unsigned long)_stext);
765 memblock_reserve(__sdma, __edma - __sdma);
766}
767
768static void __init setup_memory(void)
769{
770 phys_addr_t start, end;
771 u64 i;
772
773 /*
774 * Init storage key for present memory
775 */
776 for_each_mem_range(i, &start, &end)
777 storage_key_init_range(start, end);
778
779 psw_set_key(PAGE_DEFAULT_KEY);
780
781 /* Only cosmetics */
782 memblock_enforce_memory_limit(memblock_end_of_DRAM());
783}
784
785/*
786 * Setup hardware capabilities.
787 */
788static int __init setup_hwcaps(void)
789{
790 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
791 struct cpuid cpu_id;
792 int i;
793
794 /*
795 * The store facility list bits numbers as found in the principles
796 * of operation are numbered with bit 1UL<<31 as number 0 to
797 * bit 1UL<<0 as number 31.
798 * Bit 0: instructions named N3, "backported" to esa-mode
799 * Bit 2: z/Architecture mode is active
800 * Bit 7: the store-facility-list-extended facility is installed
801 * Bit 17: the message-security assist is installed
802 * Bit 19: the long-displacement facility is installed
803 * Bit 21: the extended-immediate facility is installed
804 * Bit 22: extended-translation facility 3 is installed
805 * Bit 30: extended-translation facility 3 enhancement facility
806 * These get translated to:
807 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
808 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
809 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
810 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
811 */
812 for (i = 0; i < 6; i++)
813 if (test_facility(stfl_bits[i]))
814 elf_hwcap |= 1UL << i;
815
816 if (test_facility(22) && test_facility(30))
817 elf_hwcap |= HWCAP_S390_ETF3EH;
818
819 /*
820 * Check for additional facilities with store-facility-list-extended.
821 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
822 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
823 * as stored by stfl, bits 32-xxx contain additional facilities.
824 * How many facility words are stored depends on the number of
825 * doublewords passed to the instruction. The additional facilities
826 * are:
827 * Bit 42: decimal floating point facility is installed
828 * Bit 44: perform floating point operation facility is installed
829 * translated to:
830 * HWCAP_S390_DFP bit 6 (42 && 44).
831 */
832 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
833 elf_hwcap |= HWCAP_S390_DFP;
834
835 /*
836 * Huge page support HWCAP_S390_HPAGE is bit 7.
837 */
838 if (MACHINE_HAS_EDAT1)
839 elf_hwcap |= HWCAP_S390_HPAGE;
840
841 /*
842 * 64-bit register support for 31-bit processes
843 * HWCAP_S390_HIGH_GPRS is bit 9.
844 */
845 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
846
847 /*
848 * Transactional execution support HWCAP_S390_TE is bit 10.
849 */
850 if (MACHINE_HAS_TE)
851 elf_hwcap |= HWCAP_S390_TE;
852
853 /*
854 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
855 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
856 * instead of facility bit 129.
857 */
858 if (MACHINE_HAS_VX) {
859 elf_hwcap |= HWCAP_S390_VXRS;
860 if (test_facility(134))
861 elf_hwcap |= HWCAP_S390_VXRS_BCD;
862 if (test_facility(135))
863 elf_hwcap |= HWCAP_S390_VXRS_EXT;
864 if (test_facility(148))
865 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
866 if (test_facility(152))
867 elf_hwcap |= HWCAP_S390_VXRS_PDE;
868 }
869 if (test_facility(150))
870 elf_hwcap |= HWCAP_S390_SORT;
871 if (test_facility(151))
872 elf_hwcap |= HWCAP_S390_DFLT;
873
874 /*
875 * Guarded storage support HWCAP_S390_GS is bit 12.
876 */
877 if (MACHINE_HAS_GS)
878 elf_hwcap |= HWCAP_S390_GS;
879
880 get_cpu_id(&cpu_id);
881 add_device_randomness(&cpu_id, sizeof(cpu_id));
882 switch (cpu_id.machine) {
883 case 0x2064:
884 case 0x2066:
885 default: /* Use "z900" as default for 64 bit kernels. */
886 strcpy(elf_platform, "z900");
887 break;
888 case 0x2084:
889 case 0x2086:
890 strcpy(elf_platform, "z990");
891 break;
892 case 0x2094:
893 case 0x2096:
894 strcpy(elf_platform, "z9-109");
895 break;
896 case 0x2097:
897 case 0x2098:
898 strcpy(elf_platform, "z10");
899 break;
900 case 0x2817:
901 case 0x2818:
902 strcpy(elf_platform, "z196");
903 break;
904 case 0x2827:
905 case 0x2828:
906 strcpy(elf_platform, "zEC12");
907 break;
908 case 0x2964:
909 case 0x2965:
910 strcpy(elf_platform, "z13");
911 break;
912 case 0x3906:
913 case 0x3907:
914 strcpy(elf_platform, "z14");
915 break;
916 case 0x8561:
917 case 0x8562:
918 strcpy(elf_platform, "z15");
919 break;
920 }
921
922 /*
923 * Virtualization support HWCAP_INT_SIE is bit 0.
924 */
925 if (sclp.has_sief2)
926 int_hwcap |= HWCAP_INT_SIE;
927
928 return 0;
929}
930arch_initcall(setup_hwcaps);
931
932/*
933 * Add system information as device randomness
934 */
935static void __init setup_randomness(void)
936{
937 struct sysinfo_3_2_2 *vmms;
938
939 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
940 PAGE_SIZE);
941 if (!vmms)
942 panic("Failed to allocate memory for sysinfo structure\n");
943
944 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
945 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
946 memblock_free((unsigned long) vmms, PAGE_SIZE);
947}
948
949/*
950 * Find the correct size for the task_struct. This depends on
951 * the size of the struct fpu at the end of the thread_struct
952 * which is embedded in the task_struct.
953 */
954static void __init setup_task_size(void)
955{
956 int task_size = sizeof(struct task_struct);
957
958 if (!MACHINE_HAS_VX) {
959 task_size -= sizeof(__vector128) * __NUM_VXRS;
960 task_size += sizeof(freg_t) * __NUM_FPRS;
961 }
962 arch_task_struct_size = task_size;
963}
964
965/*
966 * Issue diagnose 318 to set the control program name and
967 * version codes.
968 */
969static void __init setup_control_program_code(void)
970{
971 union diag318_info diag318_info = {
972 .cpnc = CPNC_LINUX,
973 .cpvc = 0,
974 };
975
976 if (!sclp.has_diag318)
977 return;
978
979 diag_stat_inc(DIAG_STAT_X318);
980 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
981}
982
983/*
984 * Print the component list from the IPL report
985 */
986static void __init log_component_list(void)
987{
988 struct ipl_rb_component_entry *ptr, *end;
989 char *str;
990
991 if (!early_ipl_comp_list_addr)
992 return;
993 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
994 pr_info("Linux is running with Secure-IPL enabled\n");
995 else
996 pr_info("Linux is running with Secure-IPL disabled\n");
997 ptr = (void *) early_ipl_comp_list_addr;
998 end = (void *) ptr + early_ipl_comp_list_size;
999 pr_info("The IPL report contains the following components:\n");
1000 while (ptr < end) {
1001 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1002 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1003 str = "signed, verified";
1004 else
1005 str = "signed, verification failed";
1006 } else {
1007 str = "not signed";
1008 }
1009 pr_info("%016llx - %016llx (%s)\n",
1010 ptr->addr, ptr->addr + ptr->len, str);
1011 ptr++;
1012 }
1013}
1014
1015/*
1016 * Setup function called from init/main.c just after the banner
1017 * was printed.
1018 */
1019
1020void __init setup_arch(char **cmdline_p)
1021{
1022 /*
1023 * print what head.S has found out about the machine
1024 */
1025 if (MACHINE_IS_VM)
1026 pr_info("Linux is running as a z/VM "
1027 "guest operating system in 64-bit mode\n");
1028 else if (MACHINE_IS_KVM)
1029 pr_info("Linux is running under KVM in 64-bit mode\n");
1030 else if (MACHINE_IS_LPAR)
1031 pr_info("Linux is running natively in 64-bit mode\n");
1032 else
1033 pr_info("Linux is running as a guest in 64-bit mode\n");
1034
1035 log_component_list();
1036
1037 /* Have one command line that is parsed and saved in /proc/cmdline */
1038 /* boot_command_line has been already set up in early.c */
1039 *cmdline_p = boot_command_line;
1040
1041 ROOT_DEV = Root_RAM0;
1042
1043 setup_initial_init_mm(_text, _etext, _edata, _end);
1044
1045 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1046 nospec_auto_detect();
1047
1048 jump_label_init();
1049 parse_early_param();
1050#ifdef CONFIG_CRASH_DUMP
1051 /* Deactivate elfcorehdr= kernel parameter */
1052 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1053#endif
1054
1055 os_info_init();
1056 setup_ipl();
1057 setup_task_size();
1058 setup_control_program_code();
1059
1060 /* Do some memory reservations *before* memory is added to memblock */
1061 reserve_above_ident_map();
1062 reserve_kernel();
1063 reserve_initrd();
1064 reserve_certificate_list();
1065 reserve_mem_detect_info();
1066 memblock_allow_resize();
1067
1068 /* Get information about *all* installed memory */
1069 memblock_add_mem_detect_info();
1070
1071 free_mem_detect_info();
1072
1073 setup_uv();
1074 setup_memory_end();
1075 setup_memory();
1076 dma_contiguous_reserve(ident_map_size);
1077 vmcp_cma_reserve();
1078 if (MACHINE_HAS_EDAT2)
1079 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1080
1081 check_initrd();
1082 reserve_crashkernel();
1083#ifdef CONFIG_CRASH_DUMP
1084 /*
1085 * Be aware that smp_save_dump_cpus() triggers a system reset.
1086 * Therefore CPU and device initialization should be done afterwards.
1087 */
1088 smp_save_dump_cpus();
1089#endif
1090
1091 setup_resources();
1092 setup_lowcore_dat_off();
1093 smp_fill_possible_mask();
1094 cpu_detect_mhz_feature();
1095 cpu_init();
1096 numa_setup();
1097 smp_detect_cpus();
1098 topology_init_early();
1099
1100 /*
1101 * Create kernel page tables and switch to virtual addressing.
1102 */
1103 paging_init();
1104
1105 /*
1106 * After paging_init created the kernel page table, the new PSWs
1107 * in lowcore can now run with DAT enabled.
1108 */
1109 setup_lowcore_dat_on();
1110
1111 /* Setup default console */
1112 conmode_default();
1113 set_preferred_console();
1114
1115 apply_alternative_instructions();
1116 if (IS_ENABLED(CONFIG_EXPOLINE))
1117 nospec_init_branches();
1118
1119 /* Setup zfcp/nvme dump support */
1120 setup_zfcpdump();
1121
1122 /* Add system specific data to the random pool */
1123 setup_randomness();
1124}