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1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
9 */
10
11/*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
15#define KMSG_COMPONENT "setup"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/errno.h>
19#include <linux/export.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/memblock.h>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/ptrace.h>
27#include <linux/random.h>
28#include <linux/user.h>
29#include <linux/tty.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/kernel_stat.h>
38#include <linux/dma-contiguous.h>
39#include <linux/device.h>
40#include <linux/notifier.h>
41#include <linux/pfn.h>
42#include <linux/ctype.h>
43#include <linux/reboot.h>
44#include <linux/topology.h>
45#include <linux/kexec.h>
46#include <linux/crash_dump.h>
47#include <linux/memory.h>
48#include <linux/compat.h>
49
50#include <asm/ipl.h>
51#include <asm/facility.h>
52#include <asm/smp.h>
53#include <asm/mmu_context.h>
54#include <asm/cpcmd.h>
55#include <asm/lowcore.h>
56#include <asm/irq.h>
57#include <asm/page.h>
58#include <asm/ptrace.h>
59#include <asm/sections.h>
60#include <asm/ebcdic.h>
61#include <asm/kvm_virtio.h>
62#include <asm/diag.h>
63#include <asm/os_info.h>
64#include <asm/sclp.h>
65#include <asm/sysinfo.h>
66#include <asm/numa.h>
67#include "entry.h"
68
69/*
70 * Machine setup..
71 */
72unsigned int console_mode = 0;
73EXPORT_SYMBOL(console_mode);
74
75unsigned int console_devno = -1;
76EXPORT_SYMBOL(console_devno);
77
78unsigned int console_irq = -1;
79EXPORT_SYMBOL(console_irq);
80
81unsigned long elf_hwcap __read_mostly = 0;
82char elf_platform[ELF_PLATFORM_SIZE];
83
84unsigned long int_hwcap = 0;
85
86int __initdata memory_end_set;
87unsigned long __initdata memory_end;
88unsigned long __initdata max_physmem_end;
89
90unsigned long VMALLOC_START;
91EXPORT_SYMBOL(VMALLOC_START);
92
93unsigned long VMALLOC_END;
94EXPORT_SYMBOL(VMALLOC_END);
95
96struct page *vmemmap;
97EXPORT_SYMBOL(vmemmap);
98
99unsigned long MODULES_VADDR;
100unsigned long MODULES_END;
101
102/* An array with a pointer to the lowcore of every CPU. */
103struct lowcore *lowcore_ptr[NR_CPUS];
104EXPORT_SYMBOL(lowcore_ptr);
105
106/*
107 * This is set up by the setup-routine at boot-time
108 * for S390 need to find out, what we have to setup
109 * using address 0x10400 ...
110 */
111
112#include <asm/setup.h>
113
114/*
115 * condev= and conmode= setup parameter.
116 */
117
118static int __init condev_setup(char *str)
119{
120 int vdev;
121
122 vdev = simple_strtoul(str, &str, 0);
123 if (vdev >= 0 && vdev < 65536) {
124 console_devno = vdev;
125 console_irq = -1;
126 }
127 return 1;
128}
129
130__setup("condev=", condev_setup);
131
132static void __init set_preferred_console(void)
133{
134 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
135 add_preferred_console("ttyS", 0, NULL);
136 else if (CONSOLE_IS_3270)
137 add_preferred_console("tty3270", 0, NULL);
138 else if (CONSOLE_IS_VT220)
139 add_preferred_console("ttyS", 1, NULL);
140 else if (CONSOLE_IS_HVC)
141 add_preferred_console("hvc", 0, NULL);
142}
143
144static int __init conmode_setup(char *str)
145{
146#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
147 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
148 SET_CONSOLE_SCLP;
149#endif
150#if defined(CONFIG_TN3215_CONSOLE)
151 if (strncmp(str, "3215", 5) == 0)
152 SET_CONSOLE_3215;
153#endif
154#if defined(CONFIG_TN3270_CONSOLE)
155 if (strncmp(str, "3270", 5) == 0)
156 SET_CONSOLE_3270;
157#endif
158 set_preferred_console();
159 return 1;
160}
161
162__setup("conmode=", conmode_setup);
163
164static void __init conmode_default(void)
165{
166 char query_buffer[1024];
167 char *ptr;
168
169 if (MACHINE_IS_VM) {
170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172 ptr = strstr(query_buffer, "SUBCHANNEL =");
173 console_irq = simple_strtoul(ptr + 13, NULL, 16);
174 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175 ptr = strstr(query_buffer, "CONMODE");
176 /*
177 * Set the conmode to 3215 so that the device recognition
178 * will set the cu_type of the console to 3215. If the
179 * conmode is 3270 and we don't set it back then both
180 * 3215 and the 3270 driver will try to access the console
181 * device (3215 as console and 3270 as normal tty).
182 */
183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
184 if (ptr == NULL) {
185#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
186 SET_CONSOLE_SCLP;
187#endif
188 return;
189 }
190 if (strncmp(ptr + 8, "3270", 4) == 0) {
191#if defined(CONFIG_TN3270_CONSOLE)
192 SET_CONSOLE_3270;
193#elif defined(CONFIG_TN3215_CONSOLE)
194 SET_CONSOLE_3215;
195#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196 SET_CONSOLE_SCLP;
197#endif
198 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
199#if defined(CONFIG_TN3215_CONSOLE)
200 SET_CONSOLE_3215;
201#elif defined(CONFIG_TN3270_CONSOLE)
202 SET_CONSOLE_3270;
203#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204 SET_CONSOLE_SCLP;
205#endif
206 }
207 } else if (MACHINE_IS_KVM) {
208 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
209 SET_CONSOLE_VT220;
210 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
211 SET_CONSOLE_SCLP;
212 else
213 SET_CONSOLE_HVC;
214 } else {
215#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216 SET_CONSOLE_SCLP;
217#endif
218 }
219}
220
221#ifdef CONFIG_CRASH_DUMP
222static void __init setup_zfcpdump(void)
223{
224 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
225 return;
226 if (OLDMEM_BASE)
227 return;
228 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
229 console_loglevel = 2;
230}
231#else
232static inline void setup_zfcpdump(void) {}
233#endif /* CONFIG_CRASH_DUMP */
234
235 /*
236 * Reboot, halt and power_off stubs. They just call _machine_restart,
237 * _machine_halt or _machine_power_off.
238 */
239
240void machine_restart(char *command)
241{
242 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
243 /*
244 * Only unblank the console if we are called in enabled
245 * context or a bust_spinlocks cleared the way for us.
246 */
247 console_unblank();
248 _machine_restart(command);
249}
250
251void machine_halt(void)
252{
253 if (!in_interrupt() || oops_in_progress)
254 /*
255 * Only unblank the console if we are called in enabled
256 * context or a bust_spinlocks cleared the way for us.
257 */
258 console_unblank();
259 _machine_halt();
260}
261
262void machine_power_off(void)
263{
264 if (!in_interrupt() || oops_in_progress)
265 /*
266 * Only unblank the console if we are called in enabled
267 * context or a bust_spinlocks cleared the way for us.
268 */
269 console_unblank();
270 _machine_power_off();
271}
272
273/*
274 * Dummy power off function.
275 */
276void (*pm_power_off)(void) = machine_power_off;
277EXPORT_SYMBOL_GPL(pm_power_off);
278
279static int __init early_parse_mem(char *p)
280{
281 memory_end = memparse(p, &p);
282 memory_end &= PAGE_MASK;
283 memory_end_set = 1;
284 return 0;
285}
286early_param("mem", early_parse_mem);
287
288static int __init parse_vmalloc(char *arg)
289{
290 if (!arg)
291 return -EINVAL;
292 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
293 return 0;
294}
295early_param("vmalloc", parse_vmalloc);
296
297void *restart_stack __section(.data);
298
299static void __init setup_lowcore(void)
300{
301 struct lowcore *lc;
302
303 /*
304 * Setup lowcore for boot cpu
305 */
306 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
307 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
308 lc->restart_psw.mask = PSW_KERNEL_BITS;
309 lc->restart_psw.addr = (unsigned long) restart_int_handler;
310 lc->external_new_psw.mask = PSW_KERNEL_BITS |
311 PSW_MASK_DAT | PSW_MASK_MCHECK;
312 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
313 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
314 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
315 lc->svc_new_psw.addr = (unsigned long) system_call;
316 lc->program_new_psw.mask = PSW_KERNEL_BITS |
317 PSW_MASK_DAT | PSW_MASK_MCHECK;
318 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
319 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
320 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
321 lc->io_new_psw.mask = PSW_KERNEL_BITS |
322 PSW_MASK_DAT | PSW_MASK_MCHECK;
323 lc->io_new_psw.addr = (unsigned long) io_int_handler;
324 lc->clock_comparator = -1ULL;
325 lc->kernel_stack = ((unsigned long) &init_thread_union)
326 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327 lc->async_stack = (unsigned long)
328 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
329 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->panic_stack = (unsigned long)
331 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
332 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
333 lc->current_task = (unsigned long)&init_task;
334 lc->lpp = LPP_MAGIC;
335 lc->machine_flags = S390_lowcore.machine_flags;
336 lc->preempt_count = S390_lowcore.preempt_count;
337 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
338 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
339 MAX_FACILITY_BIT/8);
340 if (MACHINE_HAS_VX)
341 lc->vector_save_area_addr =
342 (unsigned long) &lc->vector_save_area;
343 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
344 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
345 lc->async_enter_timer = S390_lowcore.async_enter_timer;
346 lc->exit_timer = S390_lowcore.exit_timer;
347 lc->user_timer = S390_lowcore.user_timer;
348 lc->system_timer = S390_lowcore.system_timer;
349 lc->steal_timer = S390_lowcore.steal_timer;
350 lc->last_update_timer = S390_lowcore.last_update_timer;
351 lc->last_update_clock = S390_lowcore.last_update_clock;
352
353 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
354 restart_stack += ASYNC_SIZE;
355
356 /*
357 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
358 * restart data to the absolute zero lowcore. This is necessary if
359 * PSW restart is done on an offline CPU that has lowcore zero.
360 */
361 lc->restart_stack = (unsigned long) restart_stack;
362 lc->restart_fn = (unsigned long) do_restart;
363 lc->restart_data = 0;
364 lc->restart_source = -1UL;
365
366 /* Setup absolute zero lowcore */
367 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
368 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
369 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
370 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
371 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
372
373#ifdef CONFIG_SMP
374 lc->spinlock_lockval = arch_spin_lockval(0);
375#endif
376
377 set_prefix((u32)(unsigned long) lc);
378 lowcore_ptr[0] = lc;
379}
380
381static struct resource code_resource = {
382 .name = "Kernel code",
383 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
384};
385
386static struct resource data_resource = {
387 .name = "Kernel data",
388 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
389};
390
391static struct resource bss_resource = {
392 .name = "Kernel bss",
393 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
394};
395
396static struct resource __initdata *standard_resources[] = {
397 &code_resource,
398 &data_resource,
399 &bss_resource,
400};
401
402static void __init setup_resources(void)
403{
404 struct resource *res, *std_res, *sub_res;
405 struct memblock_region *reg;
406 int j;
407
408 code_resource.start = (unsigned long) &_text;
409 code_resource.end = (unsigned long) &_etext - 1;
410 data_resource.start = (unsigned long) &_etext;
411 data_resource.end = (unsigned long) &_edata - 1;
412 bss_resource.start = (unsigned long) &__bss_start;
413 bss_resource.end = (unsigned long) &__bss_stop - 1;
414
415 for_each_memblock(memory, reg) {
416 res = memblock_virt_alloc(sizeof(*res), 8);
417 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
418
419 res->name = "System RAM";
420 res->start = reg->base;
421 res->end = reg->base + reg->size - 1;
422 request_resource(&iomem_resource, res);
423
424 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
425 std_res = standard_resources[j];
426 if (std_res->start < res->start ||
427 std_res->start > res->end)
428 continue;
429 if (std_res->end > res->end) {
430 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8);
431 *sub_res = *std_res;
432 sub_res->end = res->end;
433 std_res->start = res->end + 1;
434 request_resource(res, sub_res);
435 } else {
436 request_resource(res, std_res);
437 }
438 }
439 }
440#ifdef CONFIG_CRASH_DUMP
441 /*
442 * Re-add removed crash kernel memory as reserved memory. This makes
443 * sure it will be mapped with the identity mapping and struct pages
444 * will be created, so it can be resized later on.
445 * However add it later since the crash kernel resource should not be
446 * part of the System RAM resource.
447 */
448 if (crashk_res.end) {
449 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
450 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
451 insert_resource(&iomem_resource, &crashk_res);
452 }
453#endif
454}
455
456static void __init setup_memory_end(void)
457{
458 unsigned long vmax, vmalloc_size, tmp;
459
460 /* Choose kernel address space layout: 2, 3, or 4 levels. */
461 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
462 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
463 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
464 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
465 vmax = 1UL << 42; /* 3-level kernel page table */
466 else
467 vmax = 1UL << 53; /* 4-level kernel page table */
468 /* module area is at the end of the kernel address space. */
469 MODULES_END = vmax;
470 MODULES_VADDR = MODULES_END - MODULES_LEN;
471 VMALLOC_END = MODULES_VADDR;
472 VMALLOC_START = vmax - vmalloc_size;
473
474 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
475 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
476 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
477 tmp = SECTION_ALIGN_UP(tmp);
478 tmp = VMALLOC_START - tmp * sizeof(struct page);
479 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
480 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
481 vmemmap = (struct page *) tmp;
482
483 /* Take care that memory_end is set and <= vmemmap */
484 memory_end = min(memory_end ?: max_physmem_end, tmp);
485 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
486 memblock_remove(memory_end, ULONG_MAX);
487
488 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
489}
490
491static void __init setup_vmcoreinfo(void)
492{
493 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
494}
495
496#ifdef CONFIG_CRASH_DUMP
497
498/*
499 * When kdump is enabled, we have to ensure that no memory from
500 * the area [0 - crashkernel memory size] and
501 * [crashk_res.start - crashk_res.end] is set offline.
502 */
503static int kdump_mem_notifier(struct notifier_block *nb,
504 unsigned long action, void *data)
505{
506 struct memory_notify *arg = data;
507
508 if (action != MEM_GOING_OFFLINE)
509 return NOTIFY_OK;
510 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
511 return NOTIFY_BAD;
512 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
513 return NOTIFY_OK;
514 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
515 return NOTIFY_OK;
516 return NOTIFY_BAD;
517}
518
519static struct notifier_block kdump_mem_nb = {
520 .notifier_call = kdump_mem_notifier,
521};
522
523#endif
524
525/*
526 * Make sure that the area behind memory_end is protected
527 */
528static void reserve_memory_end(void)
529{
530#ifdef CONFIG_CRASH_DUMP
531 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
532 !OLDMEM_BASE && sclp.hsa_size) {
533 memory_end = sclp.hsa_size;
534 memory_end &= PAGE_MASK;
535 memory_end_set = 1;
536 }
537#endif
538 if (!memory_end_set)
539 return;
540 memblock_reserve(memory_end, ULONG_MAX);
541}
542
543/*
544 * Make sure that oldmem, where the dump is stored, is protected
545 */
546static void reserve_oldmem(void)
547{
548#ifdef CONFIG_CRASH_DUMP
549 if (OLDMEM_BASE)
550 /* Forget all memory above the running kdump system */
551 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
552#endif
553}
554
555/*
556 * Make sure that oldmem, where the dump is stored, is protected
557 */
558static void remove_oldmem(void)
559{
560#ifdef CONFIG_CRASH_DUMP
561 if (OLDMEM_BASE)
562 /* Forget all memory above the running kdump system */
563 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
564#endif
565}
566
567/*
568 * Reserve memory for kdump kernel to be loaded with kexec
569 */
570static void __init reserve_crashkernel(void)
571{
572#ifdef CONFIG_CRASH_DUMP
573 unsigned long long crash_base, crash_size;
574 phys_addr_t low, high;
575 int rc;
576
577 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
578 &crash_base);
579
580 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
581 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
582 if (rc || crash_size == 0)
583 return;
584
585 if (memblock.memory.regions[0].size < crash_size) {
586 pr_info("crashkernel reservation failed: %s\n",
587 "first memory chunk must be at least crashkernel size");
588 return;
589 }
590
591 low = crash_base ?: OLDMEM_BASE;
592 high = low + crash_size;
593 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
594 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
595 crash_base = low;
596 } else {
597 /* Find suitable area in free memory */
598 low = max_t(unsigned long, crash_size, sclp.hsa_size);
599 high = crash_base ? crash_base + crash_size : ULONG_MAX;
600
601 if (crash_base && crash_base < low) {
602 pr_info("crashkernel reservation failed: %s\n",
603 "crash_base too low");
604 return;
605 }
606 low = crash_base ?: low;
607 crash_base = memblock_find_in_range(low, high, crash_size,
608 KEXEC_CRASH_MEM_ALIGN);
609 }
610
611 if (!crash_base) {
612 pr_info("crashkernel reservation failed: %s\n",
613 "no suitable area found");
614 return;
615 }
616
617 if (register_memory_notifier(&kdump_mem_nb))
618 return;
619
620 if (!OLDMEM_BASE && MACHINE_IS_VM)
621 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
622 crashk_res.start = crash_base;
623 crashk_res.end = crash_base + crash_size - 1;
624 memblock_remove(crash_base, crash_size);
625 pr_info("Reserving %lluMB of memory at %lluMB "
626 "for crashkernel (System RAM: %luMB)\n",
627 crash_size >> 20, crash_base >> 20,
628 (unsigned long)memblock.memory.total_size >> 20);
629 os_info_crashkernel_add(crash_base, crash_size);
630#endif
631}
632
633/*
634 * Reserve the initrd from being used by memblock
635 */
636static void __init reserve_initrd(void)
637{
638#ifdef CONFIG_BLK_DEV_INITRD
639 initrd_start = INITRD_START;
640 initrd_end = initrd_start + INITRD_SIZE;
641 memblock_reserve(INITRD_START, INITRD_SIZE);
642#endif
643}
644
645/*
646 * Check for initrd being in usable memory
647 */
648static void __init check_initrd(void)
649{
650#ifdef CONFIG_BLK_DEV_INITRD
651 if (INITRD_START && INITRD_SIZE &&
652 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
653 pr_err("The initial RAM disk does not fit into the memory\n");
654 memblock_free(INITRD_START, INITRD_SIZE);
655 initrd_start = initrd_end = 0;
656 }
657#endif
658}
659
660/*
661 * Reserve memory used for lowcore/command line/kernel image.
662 */
663static void __init reserve_kernel(void)
664{
665 unsigned long start_pfn = PFN_UP(__pa(&_end));
666
667#ifdef CONFIG_DMA_API_DEBUG
668 /*
669 * DMA_API_DEBUG code stumbles over addresses from the
670 * range [_ehead, _stext]. Mark the memory as reserved
671 * so it is not used for CONFIG_DMA_API_DEBUG=y.
672 */
673 memblock_reserve(0, PFN_PHYS(start_pfn));
674#else
675 memblock_reserve(0, (unsigned long)_ehead);
676 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
677 - (unsigned long)_stext);
678#endif
679}
680
681static void __init setup_memory(void)
682{
683 struct memblock_region *reg;
684
685 /*
686 * Init storage key for present memory
687 */
688 for_each_memblock(memory, reg) {
689 storage_key_init_range(reg->base, reg->base + reg->size);
690 }
691 psw_set_key(PAGE_DEFAULT_KEY);
692
693 /* Only cosmetics */
694 memblock_enforce_memory_limit(memblock_end_of_DRAM());
695}
696
697/*
698 * Setup hardware capabilities.
699 */
700static int __init setup_hwcaps(void)
701{
702 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
703 struct cpuid cpu_id;
704 int i;
705
706 /*
707 * The store facility list bits numbers as found in the principles
708 * of operation are numbered with bit 1UL<<31 as number 0 to
709 * bit 1UL<<0 as number 31.
710 * Bit 0: instructions named N3, "backported" to esa-mode
711 * Bit 2: z/Architecture mode is active
712 * Bit 7: the store-facility-list-extended facility is installed
713 * Bit 17: the message-security assist is installed
714 * Bit 19: the long-displacement facility is installed
715 * Bit 21: the extended-immediate facility is installed
716 * Bit 22: extended-translation facility 3 is installed
717 * Bit 30: extended-translation facility 3 enhancement facility
718 * These get translated to:
719 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
720 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
721 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
722 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
723 */
724 for (i = 0; i < 6; i++)
725 if (test_facility(stfl_bits[i]))
726 elf_hwcap |= 1UL << i;
727
728 if (test_facility(22) && test_facility(30))
729 elf_hwcap |= HWCAP_S390_ETF3EH;
730
731 /*
732 * Check for additional facilities with store-facility-list-extended.
733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735 * as stored by stfl, bits 32-xxx contain additional facilities.
736 * How many facility words are stored depends on the number of
737 * doublewords passed to the instruction. The additional facilities
738 * are:
739 * Bit 42: decimal floating point facility is installed
740 * Bit 44: perform floating point operation facility is installed
741 * translated to:
742 * HWCAP_S390_DFP bit 6 (42 && 44).
743 */
744 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
745 elf_hwcap |= HWCAP_S390_DFP;
746
747 /*
748 * Huge page support HWCAP_S390_HPAGE is bit 7.
749 */
750 if (MACHINE_HAS_HPAGE)
751 elf_hwcap |= HWCAP_S390_HPAGE;
752
753 /*
754 * 64-bit register support for 31-bit processes
755 * HWCAP_S390_HIGH_GPRS is bit 9.
756 */
757 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
758
759 /*
760 * Transactional execution support HWCAP_S390_TE is bit 10.
761 */
762 if (test_facility(50) && test_facility(73))
763 elf_hwcap |= HWCAP_S390_TE;
764
765 /*
766 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
767 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
768 * instead of facility bit 129.
769 */
770 if (MACHINE_HAS_VX)
771 elf_hwcap |= HWCAP_S390_VXRS;
772 get_cpu_id(&cpu_id);
773 add_device_randomness(&cpu_id, sizeof(cpu_id));
774 switch (cpu_id.machine) {
775 case 0x2064:
776 case 0x2066:
777 default: /* Use "z900" as default for 64 bit kernels. */
778 strcpy(elf_platform, "z900");
779 break;
780 case 0x2084:
781 case 0x2086:
782 strcpy(elf_platform, "z990");
783 break;
784 case 0x2094:
785 case 0x2096:
786 strcpy(elf_platform, "z9-109");
787 break;
788 case 0x2097:
789 case 0x2098:
790 strcpy(elf_platform, "z10");
791 break;
792 case 0x2817:
793 case 0x2818:
794 strcpy(elf_platform, "z196");
795 break;
796 case 0x2827:
797 case 0x2828:
798 strcpy(elf_platform, "zEC12");
799 break;
800 case 0x2964:
801 case 0x2965:
802 strcpy(elf_platform, "z13");
803 break;
804 }
805
806 /*
807 * Virtualization support HWCAP_INT_SIE is bit 0.
808 */
809 if (sclp.has_sief2)
810 int_hwcap |= HWCAP_INT_SIE;
811
812 return 0;
813}
814arch_initcall(setup_hwcaps);
815
816/*
817 * Add system information as device randomness
818 */
819static void __init setup_randomness(void)
820{
821 struct sysinfo_3_2_2 *vmms;
822
823 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
824 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
825 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
826 memblock_free((unsigned long) vmms, PAGE_SIZE);
827}
828
829/*
830 * Find the correct size for the task_struct. This depends on
831 * the size of the struct fpu at the end of the thread_struct
832 * which is embedded in the task_struct.
833 */
834static void __init setup_task_size(void)
835{
836 int task_size = sizeof(struct task_struct);
837
838 if (!MACHINE_HAS_VX) {
839 task_size -= sizeof(__vector128) * __NUM_VXRS;
840 task_size += sizeof(freg_t) * __NUM_FPRS;
841 }
842 arch_task_struct_size = task_size;
843}
844
845/*
846 * Setup function called from init/main.c just after the banner
847 * was printed.
848 */
849
850void __init setup_arch(char **cmdline_p)
851{
852 /*
853 * print what head.S has found out about the machine
854 */
855 if (MACHINE_IS_VM)
856 pr_info("Linux is running as a z/VM "
857 "guest operating system in 64-bit mode\n");
858 else if (MACHINE_IS_KVM)
859 pr_info("Linux is running under KVM in 64-bit mode\n");
860 else if (MACHINE_IS_LPAR)
861 pr_info("Linux is running natively in 64-bit mode\n");
862
863 /* Have one command line that is parsed and saved in /proc/cmdline */
864 /* boot_command_line has been already set up in early.c */
865 *cmdline_p = boot_command_line;
866
867 ROOT_DEV = Root_RAM0;
868
869 /* Is init_mm really needed? */
870 init_mm.start_code = PAGE_OFFSET;
871 init_mm.end_code = (unsigned long) &_etext;
872 init_mm.end_data = (unsigned long) &_edata;
873 init_mm.brk = (unsigned long) &_end;
874
875 parse_early_param();
876#ifdef CONFIG_CRASH_DUMP
877 /* Deactivate elfcorehdr= kernel parameter */
878 elfcorehdr_addr = ELFCORE_ADDR_MAX;
879#endif
880
881 os_info_init();
882 setup_ipl();
883 setup_task_size();
884
885 /* Do some memory reservations *before* memory is added to memblock */
886 reserve_memory_end();
887 reserve_oldmem();
888 reserve_kernel();
889 reserve_initrd();
890 memblock_allow_resize();
891
892 /* Get information about *all* installed memory */
893 detect_memory_memblock();
894
895 remove_oldmem();
896
897 /*
898 * Make sure all chunks are MAX_ORDER aligned so we don't need the
899 * extra checks that HOLES_IN_ZONE would require.
900 *
901 * Is this still required?
902 */
903 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
904
905 setup_memory_end();
906 setup_memory();
907 dma_contiguous_reserve(memory_end);
908
909 check_initrd();
910 reserve_crashkernel();
911#ifdef CONFIG_CRASH_DUMP
912 /*
913 * Be aware that smp_save_dump_cpus() triggers a system reset.
914 * Therefore CPU and device initialization should be done afterwards.
915 */
916 smp_save_dump_cpus();
917#endif
918
919 setup_resources();
920 setup_vmcoreinfo();
921 setup_lowcore();
922 smp_fill_possible_mask();
923 cpu_detect_mhz_feature();
924 cpu_init();
925 numa_setup();
926 smp_detect_cpus();
927 topology_init_early();
928
929 /*
930 * Create kernel page tables and switch to virtual addressing.
931 */
932 paging_init();
933
934 /* Setup default console */
935 conmode_default();
936 set_preferred_console();
937
938 /* Setup zfcpdump support */
939 setup_zfcpdump();
940
941 /* Add system specific data to the random pool */
942 setup_randomness();
943}
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}