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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-contiguous.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52
53#include <asm/boot_data.h>
54#include <asm/ipl.h>
55#include <asm/facility.h>
56#include <asm/smp.h>
57#include <asm/mmu_context.h>
58#include <asm/cpcmd.h>
59#include <asm/lowcore.h>
60#include <asm/nmi.h>
61#include <asm/irq.h>
62#include <asm/page.h>
63#include <asm/ptrace.h>
64#include <asm/sections.h>
65#include <asm/ebcdic.h>
66#include <asm/diag.h>
67#include <asm/os_info.h>
68#include <asm/sclp.h>
69#include <asm/stacktrace.h>
70#include <asm/sysinfo.h>
71#include <asm/numa.h>
72#include <asm/alternative.h>
73#include <asm/nospec-branch.h>
74#include <asm/mem_detect.h>
75#include <asm/uv.h>
76#include <asm/asm-offsets.h>
77#include "entry.h"
78
79/*
80 * Machine setup..
81 */
82unsigned int console_mode = 0;
83EXPORT_SYMBOL(console_mode);
84
85unsigned int console_devno = -1;
86EXPORT_SYMBOL(console_devno);
87
88unsigned int console_irq = -1;
89EXPORT_SYMBOL(console_irq);
90
91unsigned long elf_hwcap __read_mostly = 0;
92char elf_platform[ELF_PLATFORM_SIZE];
93
94unsigned long int_hwcap = 0;
95
96int __bootdata(noexec_disabled);
97int __bootdata(memory_end_set);
98unsigned long __bootdata(memory_end);
99unsigned long __bootdata(vmalloc_size);
100unsigned long __bootdata(max_physmem_end);
101struct mem_detect_info __bootdata(mem_detect);
102
103struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
104struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
105unsigned long __bootdata_preserved(__swsusp_reset_dma);
106unsigned long __bootdata_preserved(__stext_dma);
107unsigned long __bootdata_preserved(__etext_dma);
108unsigned long __bootdata_preserved(__sdma);
109unsigned long __bootdata_preserved(__edma);
110unsigned long __bootdata_preserved(__kaslr_offset);
111unsigned int __bootdata_preserved(zlib_dfltcc_support);
112EXPORT_SYMBOL(zlib_dfltcc_support);
113
114unsigned long VMALLOC_START;
115EXPORT_SYMBOL(VMALLOC_START);
116
117unsigned long VMALLOC_END;
118EXPORT_SYMBOL(VMALLOC_END);
119
120struct page *vmemmap;
121EXPORT_SYMBOL(vmemmap);
122
123unsigned long MODULES_VADDR;
124unsigned long MODULES_END;
125
126/* An array with a pointer to the lowcore of every CPU. */
127struct lowcore *lowcore_ptr[NR_CPUS];
128EXPORT_SYMBOL(lowcore_ptr);
129
130/*
131 * This is set up by the setup-routine at boot-time
132 * for S390 need to find out, what we have to setup
133 * using address 0x10400 ...
134 */
135
136#include <asm/setup.h>
137
138/*
139 * condev= and conmode= setup parameter.
140 */
141
142static int __init condev_setup(char *str)
143{
144 int vdev;
145
146 vdev = simple_strtoul(str, &str, 0);
147 if (vdev >= 0 && vdev < 65536) {
148 console_devno = vdev;
149 console_irq = -1;
150 }
151 return 1;
152}
153
154__setup("condev=", condev_setup);
155
156static void __init set_preferred_console(void)
157{
158 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
159 add_preferred_console("ttyS", 0, NULL);
160 else if (CONSOLE_IS_3270)
161 add_preferred_console("tty3270", 0, NULL);
162 else if (CONSOLE_IS_VT220)
163 add_preferred_console("ttyS", 1, NULL);
164 else if (CONSOLE_IS_HVC)
165 add_preferred_console("hvc", 0, NULL);
166}
167
168static int __init conmode_setup(char *str)
169{
170#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
171 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
172 SET_CONSOLE_SCLP;
173#endif
174#if defined(CONFIG_TN3215_CONSOLE)
175 if (!strcmp(str, "3215"))
176 SET_CONSOLE_3215;
177#endif
178#if defined(CONFIG_TN3270_CONSOLE)
179 if (!strcmp(str, "3270"))
180 SET_CONSOLE_3270;
181#endif
182 set_preferred_console();
183 return 1;
184}
185
186__setup("conmode=", conmode_setup);
187
188static void __init conmode_default(void)
189{
190 char query_buffer[1024];
191 char *ptr;
192
193 if (MACHINE_IS_VM) {
194 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
196 ptr = strstr(query_buffer, "SUBCHANNEL =");
197 console_irq = simple_strtoul(ptr + 13, NULL, 16);
198 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
199 ptr = strstr(query_buffer, "CONMODE");
200 /*
201 * Set the conmode to 3215 so that the device recognition
202 * will set the cu_type of the console to 3215. If the
203 * conmode is 3270 and we don't set it back then both
204 * 3215 and the 3270 driver will try to access the console
205 * device (3215 as console and 3270 as normal tty).
206 */
207 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
208 if (ptr == NULL) {
209#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 SET_CONSOLE_SCLP;
211#endif
212 return;
213 }
214 if (str_has_prefix(ptr + 8, "3270")) {
215#if defined(CONFIG_TN3270_CONSOLE)
216 SET_CONSOLE_3270;
217#elif defined(CONFIG_TN3215_CONSOLE)
218 SET_CONSOLE_3215;
219#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
220 SET_CONSOLE_SCLP;
221#endif
222 } else if (str_has_prefix(ptr + 8, "3215")) {
223#if defined(CONFIG_TN3215_CONSOLE)
224 SET_CONSOLE_3215;
225#elif defined(CONFIG_TN3270_CONSOLE)
226 SET_CONSOLE_3270;
227#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 }
231 } else if (MACHINE_IS_KVM) {
232 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
233 SET_CONSOLE_VT220;
234 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
235 SET_CONSOLE_SCLP;
236 else
237 SET_CONSOLE_HVC;
238 } else {
239#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
240 SET_CONSOLE_SCLP;
241#endif
242 }
243}
244
245#ifdef CONFIG_CRASH_DUMP
246static void __init setup_zfcpdump(void)
247{
248 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
249 return;
250 if (OLDMEM_BASE)
251 return;
252 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
253 console_loglevel = 2;
254}
255#else
256static inline void setup_zfcpdump(void) {}
257#endif /* CONFIG_CRASH_DUMP */
258
259 /*
260 * Reboot, halt and power_off stubs. They just call _machine_restart,
261 * _machine_halt or _machine_power_off.
262 */
263
264void machine_restart(char *command)
265{
266 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
267 /*
268 * Only unblank the console if we are called in enabled
269 * context or a bust_spinlocks cleared the way for us.
270 */
271 console_unblank();
272 _machine_restart(command);
273}
274
275void machine_halt(void)
276{
277 if (!in_interrupt() || oops_in_progress)
278 /*
279 * Only unblank the console if we are called in enabled
280 * context or a bust_spinlocks cleared the way for us.
281 */
282 console_unblank();
283 _machine_halt();
284}
285
286void machine_power_off(void)
287{
288 if (!in_interrupt() || oops_in_progress)
289 /*
290 * Only unblank the console if we are called in enabled
291 * context or a bust_spinlocks cleared the way for us.
292 */
293 console_unblank();
294 _machine_power_off();
295}
296
297/*
298 * Dummy power off function.
299 */
300void (*pm_power_off)(void) = machine_power_off;
301EXPORT_SYMBOL_GPL(pm_power_off);
302
303void *restart_stack __section(.data);
304
305unsigned long stack_alloc(void)
306{
307#ifdef CONFIG_VMAP_STACK
308 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE,
309 THREADINFO_GFP, NUMA_NO_NODE,
310 __builtin_return_address(0));
311#else
312 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
313#endif
314}
315
316void stack_free(unsigned long stack)
317{
318#ifdef CONFIG_VMAP_STACK
319 vfree((void *) stack);
320#else
321 free_pages(stack, THREAD_SIZE_ORDER);
322#endif
323}
324
325int __init arch_early_irq_init(void)
326{
327 unsigned long stack;
328
329 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
330 if (!stack)
331 panic("Couldn't allocate async stack");
332 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
333 return 0;
334}
335
336static int __init async_stack_realloc(void)
337{
338 unsigned long old, new;
339
340 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
341 new = stack_alloc();
342 if (!new)
343 panic("Couldn't allocate async stack");
344 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
345 free_pages(old, THREAD_SIZE_ORDER);
346 return 0;
347}
348early_initcall(async_stack_realloc);
349
350void __init arch_call_rest_init(void)
351{
352 unsigned long stack;
353
354 stack = stack_alloc();
355 if (!stack)
356 panic("Couldn't allocate kernel stack");
357 current->stack = (void *) stack;
358#ifdef CONFIG_VMAP_STACK
359 current->stack_vm_area = (void *) stack;
360#endif
361 set_task_stack_end_magic(current);
362 stack += STACK_INIT_OFFSET;
363 S390_lowcore.kernel_stack = stack;
364 CALL_ON_STACK_NORETURN(rest_init, stack);
365}
366
367static void __init setup_lowcore_dat_off(void)
368{
369 struct lowcore *lc;
370
371 /*
372 * Setup lowcore for boot cpu
373 */
374 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
375 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
376 if (!lc)
377 panic("%s: Failed to allocate %zu bytes align=%zx\n",
378 __func__, sizeof(*lc), sizeof(*lc));
379
380 lc->restart_psw.mask = PSW_KERNEL_BITS;
381 lc->restart_psw.addr = (unsigned long) restart_int_handler;
382 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
383 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
384 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
385 lc->svc_new_psw.addr = (unsigned long) system_call;
386 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
387 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
388 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
389 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
390 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
391 lc->io_new_psw.addr = (unsigned long) io_int_handler;
392 lc->clock_comparator = clock_comparator_max;
393 lc->nodat_stack = ((unsigned long) &init_thread_union)
394 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
395 lc->current_task = (unsigned long)&init_task;
396 lc->lpp = LPP_MAGIC;
397 lc->machine_flags = S390_lowcore.machine_flags;
398 lc->preempt_count = S390_lowcore.preempt_count;
399 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
400 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
401 sizeof(lc->stfle_fac_list));
402 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
403 sizeof(lc->alt_stfle_fac_list));
404 nmi_alloc_boot_cpu(lc);
405 vdso_alloc_boot_cpu(lc);
406 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
407 lc->async_enter_timer = S390_lowcore.async_enter_timer;
408 lc->exit_timer = S390_lowcore.exit_timer;
409 lc->user_timer = S390_lowcore.user_timer;
410 lc->system_timer = S390_lowcore.system_timer;
411 lc->steal_timer = S390_lowcore.steal_timer;
412 lc->last_update_timer = S390_lowcore.last_update_timer;
413 lc->last_update_clock = S390_lowcore.last_update_clock;
414
415 /*
416 * Allocate the global restart stack which is the same for
417 * all CPUs in cast *one* of them does a PSW restart.
418 */
419 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
420 if (!restart_stack)
421 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
422 __func__, THREAD_SIZE, THREAD_SIZE);
423 restart_stack += STACK_INIT_OFFSET;
424
425 /*
426 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
427 * restart data to the absolute zero lowcore. This is necessary if
428 * PSW restart is done on an offline CPU that has lowcore zero.
429 */
430 lc->restart_stack = (unsigned long) restart_stack;
431 lc->restart_fn = (unsigned long) do_restart;
432 lc->restart_data = 0;
433 lc->restart_source = -1UL;
434
435 /* Setup absolute zero lowcore */
436 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
437 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
438 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
439 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
440 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
441
442 lc->spinlock_lockval = arch_spin_lockval(0);
443 lc->spinlock_index = 0;
444 arch_spin_lock_setup(0);
445 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
446 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
447 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
448
449 set_prefix((u32)(unsigned long) lc);
450 lowcore_ptr[0] = lc;
451}
452
453static void __init setup_lowcore_dat_on(void)
454{
455 __ctl_clear_bit(0, 28);
456 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
457 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
458 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
459 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
460 __ctl_set_bit(0, 28);
461}
462
463static struct resource code_resource = {
464 .name = "Kernel code",
465 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
466};
467
468static struct resource data_resource = {
469 .name = "Kernel data",
470 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
471};
472
473static struct resource bss_resource = {
474 .name = "Kernel bss",
475 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
476};
477
478static struct resource __initdata *standard_resources[] = {
479 &code_resource,
480 &data_resource,
481 &bss_resource,
482};
483
484static void __init setup_resources(void)
485{
486 struct resource *res, *std_res, *sub_res;
487 struct memblock_region *reg;
488 int j;
489
490 code_resource.start = (unsigned long) _text;
491 code_resource.end = (unsigned long) _etext - 1;
492 data_resource.start = (unsigned long) _etext;
493 data_resource.end = (unsigned long) _edata - 1;
494 bss_resource.start = (unsigned long) __bss_start;
495 bss_resource.end = (unsigned long) __bss_stop - 1;
496
497 for_each_memblock(memory, reg) {
498 res = memblock_alloc(sizeof(*res), 8);
499 if (!res)
500 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
501 __func__, sizeof(*res), 8);
502 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
503
504 res->name = "System RAM";
505 res->start = reg->base;
506 res->end = reg->base + reg->size - 1;
507 request_resource(&iomem_resource, res);
508
509 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
510 std_res = standard_resources[j];
511 if (std_res->start < res->start ||
512 std_res->start > res->end)
513 continue;
514 if (std_res->end > res->end) {
515 sub_res = memblock_alloc(sizeof(*sub_res), 8);
516 if (!sub_res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*sub_res), 8);
519 *sub_res = *std_res;
520 sub_res->end = res->end;
521 std_res->start = res->end + 1;
522 request_resource(res, sub_res);
523 } else {
524 request_resource(res, std_res);
525 }
526 }
527 }
528#ifdef CONFIG_CRASH_DUMP
529 /*
530 * Re-add removed crash kernel memory as reserved memory. This makes
531 * sure it will be mapped with the identity mapping and struct pages
532 * will be created, so it can be resized later on.
533 * However add it later since the crash kernel resource should not be
534 * part of the System RAM resource.
535 */
536 if (crashk_res.end) {
537 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
538 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
539 insert_resource(&iomem_resource, &crashk_res);
540 }
541#endif
542}
543
544static void __init setup_memory_end(void)
545{
546 unsigned long vmax, tmp;
547
548 /* Choose kernel address space layout: 3 or 4 levels. */
549 if (IS_ENABLED(CONFIG_KASAN)) {
550 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
551 ? _REGION1_SIZE
552 : _REGION2_SIZE;
553 } else {
554 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
555 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
556 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
557 vmax = _REGION2_SIZE; /* 3-level kernel page table */
558 else
559 vmax = _REGION1_SIZE; /* 4-level kernel page table */
560 }
561
562 if (is_prot_virt_host())
563 adjust_to_uv_max(&vmax);
564
565 /* module area is at the end of the kernel address space. */
566 MODULES_END = vmax;
567 MODULES_VADDR = MODULES_END - MODULES_LEN;
568 VMALLOC_END = MODULES_VADDR;
569 VMALLOC_START = VMALLOC_END - vmalloc_size;
570
571 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
572 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
573 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
574 tmp = SECTION_ALIGN_UP(tmp);
575 tmp = VMALLOC_START - tmp * sizeof(struct page);
576 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
577 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
578 vmemmap = (struct page *) tmp;
579
580 /* Take care that memory_end is set and <= vmemmap */
581 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
582#ifdef CONFIG_KASAN
583 /* fit in kasan shadow memory region between 1:1 and vmemmap */
584 memory_end = min(memory_end, KASAN_SHADOW_START);
585 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
586#endif
587 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
588 memblock_remove(memory_end, ULONG_MAX);
589
590 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
591}
592
593#ifdef CONFIG_CRASH_DUMP
594
595/*
596 * When kdump is enabled, we have to ensure that no memory from the area
597 * [0 - crashkernel memory size] is set offline - it will be exchanged with
598 * the crashkernel memory region when kdump is triggered. The crashkernel
599 * memory region can never get offlined (pages are unmovable).
600 */
601static int kdump_mem_notifier(struct notifier_block *nb,
602 unsigned long action, void *data)
603{
604 struct memory_notify *arg = data;
605
606 if (action != MEM_GOING_OFFLINE)
607 return NOTIFY_OK;
608 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
609 return NOTIFY_BAD;
610 return NOTIFY_OK;
611}
612
613static struct notifier_block kdump_mem_nb = {
614 .notifier_call = kdump_mem_notifier,
615};
616
617#endif
618
619/*
620 * Make sure that the area behind memory_end is protected
621 */
622static void __init reserve_memory_end(void)
623{
624 if (memory_end_set)
625 memblock_reserve(memory_end, ULONG_MAX);
626}
627
628/*
629 * Make sure that oldmem, where the dump is stored, is protected
630 */
631static void __init reserve_oldmem(void)
632{
633#ifdef CONFIG_CRASH_DUMP
634 if (OLDMEM_BASE)
635 /* Forget all memory above the running kdump system */
636 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
637#endif
638}
639
640/*
641 * Make sure that oldmem, where the dump is stored, is protected
642 */
643static void __init remove_oldmem(void)
644{
645#ifdef CONFIG_CRASH_DUMP
646 if (OLDMEM_BASE)
647 /* Forget all memory above the running kdump system */
648 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
649#endif
650}
651
652/*
653 * Reserve memory for kdump kernel to be loaded with kexec
654 */
655static void __init reserve_crashkernel(void)
656{
657#ifdef CONFIG_CRASH_DUMP
658 unsigned long long crash_base, crash_size;
659 phys_addr_t low, high;
660 int rc;
661
662 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
663 &crash_base);
664
665 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
666 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
667 if (rc || crash_size == 0)
668 return;
669
670 if (memblock.memory.regions[0].size < crash_size) {
671 pr_info("crashkernel reservation failed: %s\n",
672 "first memory chunk must be at least crashkernel size");
673 return;
674 }
675
676 low = crash_base ?: OLDMEM_BASE;
677 high = low + crash_size;
678 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
679 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
680 crash_base = low;
681 } else {
682 /* Find suitable area in free memory */
683 low = max_t(unsigned long, crash_size, sclp.hsa_size);
684 high = crash_base ? crash_base + crash_size : ULONG_MAX;
685
686 if (crash_base && crash_base < low) {
687 pr_info("crashkernel reservation failed: %s\n",
688 "crash_base too low");
689 return;
690 }
691 low = crash_base ?: low;
692 crash_base = memblock_find_in_range(low, high, crash_size,
693 KEXEC_CRASH_MEM_ALIGN);
694 }
695
696 if (!crash_base) {
697 pr_info("crashkernel reservation failed: %s\n",
698 "no suitable area found");
699 return;
700 }
701
702 if (register_memory_notifier(&kdump_mem_nb))
703 return;
704
705 if (!OLDMEM_BASE && MACHINE_IS_VM)
706 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
707 crashk_res.start = crash_base;
708 crashk_res.end = crash_base + crash_size - 1;
709 memblock_remove(crash_base, crash_size);
710 pr_info("Reserving %lluMB of memory at %lluMB "
711 "for crashkernel (System RAM: %luMB)\n",
712 crash_size >> 20, crash_base >> 20,
713 (unsigned long)memblock.memory.total_size >> 20);
714 os_info_crashkernel_add(crash_base, crash_size);
715#endif
716}
717
718/*
719 * Reserve the initrd from being used by memblock
720 */
721static void __init reserve_initrd(void)
722{
723#ifdef CONFIG_BLK_DEV_INITRD
724 if (!INITRD_START || !INITRD_SIZE)
725 return;
726 initrd_start = INITRD_START;
727 initrd_end = initrd_start + INITRD_SIZE;
728 memblock_reserve(INITRD_START, INITRD_SIZE);
729#endif
730}
731
732/*
733 * Reserve the memory area used to pass the certificate lists
734 */
735static void __init reserve_certificate_list(void)
736{
737 if (ipl_cert_list_addr)
738 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
739}
740
741static void __init reserve_mem_detect_info(void)
742{
743 unsigned long start, size;
744
745 get_mem_detect_reserved(&start, &size);
746 if (size)
747 memblock_reserve(start, size);
748}
749
750static void __init free_mem_detect_info(void)
751{
752 unsigned long start, size;
753
754 get_mem_detect_reserved(&start, &size);
755 if (size)
756 memblock_free(start, size);
757}
758
759static const char * __init get_mem_info_source(void)
760{
761 switch (mem_detect.info_source) {
762 case MEM_DETECT_SCLP_STOR_INFO:
763 return "sclp storage info";
764 case MEM_DETECT_DIAG260:
765 return "diag260";
766 case MEM_DETECT_SCLP_READ_INFO:
767 return "sclp read info";
768 case MEM_DETECT_BIN_SEARCH:
769 return "binary search";
770 }
771 return "none";
772}
773
774static void __init memblock_add_mem_detect_info(void)
775{
776 unsigned long start, end;
777 int i;
778
779 memblock_dbg("physmem info source: %s (%hhd)\n",
780 get_mem_info_source(), mem_detect.info_source);
781 /* keep memblock lists close to the kernel */
782 memblock_set_bottom_up(true);
783 for_each_mem_detect_block(i, &start, &end) {
784 memblock_add(start, end - start);
785 memblock_physmem_add(start, end - start);
786 }
787 memblock_set_bottom_up(false);
788 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
789 memblock_dump_all();
790}
791
792/*
793 * Check for initrd being in usable memory
794 */
795static void __init check_initrd(void)
796{
797#ifdef CONFIG_BLK_DEV_INITRD
798 if (INITRD_START && INITRD_SIZE &&
799 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
800 pr_err("The initial RAM disk does not fit into the memory\n");
801 memblock_free(INITRD_START, INITRD_SIZE);
802 initrd_start = initrd_end = 0;
803 }
804#endif
805}
806
807/*
808 * Reserve memory used for lowcore/command line/kernel image.
809 */
810static void __init reserve_kernel(void)
811{
812 unsigned long start_pfn = PFN_UP(__pa(_end));
813
814 memblock_reserve(0, HEAD_END);
815 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
816 - (unsigned long)_stext);
817 memblock_reserve(__sdma, __edma - __sdma);
818}
819
820static void __init setup_memory(void)
821{
822 struct memblock_region *reg;
823
824 /*
825 * Init storage key for present memory
826 */
827 for_each_memblock(memory, reg) {
828 storage_key_init_range(reg->base, reg->base + reg->size);
829 }
830 psw_set_key(PAGE_DEFAULT_KEY);
831
832 /* Only cosmetics */
833 memblock_enforce_memory_limit(memblock_end_of_DRAM());
834}
835
836/*
837 * Setup hardware capabilities.
838 */
839static int __init setup_hwcaps(void)
840{
841 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
842 struct cpuid cpu_id;
843 int i;
844
845 /*
846 * The store facility list bits numbers as found in the principles
847 * of operation are numbered with bit 1UL<<31 as number 0 to
848 * bit 1UL<<0 as number 31.
849 * Bit 0: instructions named N3, "backported" to esa-mode
850 * Bit 2: z/Architecture mode is active
851 * Bit 7: the store-facility-list-extended facility is installed
852 * Bit 17: the message-security assist is installed
853 * Bit 19: the long-displacement facility is installed
854 * Bit 21: the extended-immediate facility is installed
855 * Bit 22: extended-translation facility 3 is installed
856 * Bit 30: extended-translation facility 3 enhancement facility
857 * These get translated to:
858 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
859 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
860 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
861 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
862 */
863 for (i = 0; i < 6; i++)
864 if (test_facility(stfl_bits[i]))
865 elf_hwcap |= 1UL << i;
866
867 if (test_facility(22) && test_facility(30))
868 elf_hwcap |= HWCAP_S390_ETF3EH;
869
870 /*
871 * Check for additional facilities with store-facility-list-extended.
872 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
873 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
874 * as stored by stfl, bits 32-xxx contain additional facilities.
875 * How many facility words are stored depends on the number of
876 * doublewords passed to the instruction. The additional facilities
877 * are:
878 * Bit 42: decimal floating point facility is installed
879 * Bit 44: perform floating point operation facility is installed
880 * translated to:
881 * HWCAP_S390_DFP bit 6 (42 && 44).
882 */
883 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
884 elf_hwcap |= HWCAP_S390_DFP;
885
886 /*
887 * Huge page support HWCAP_S390_HPAGE is bit 7.
888 */
889 if (MACHINE_HAS_EDAT1)
890 elf_hwcap |= HWCAP_S390_HPAGE;
891
892 /*
893 * 64-bit register support for 31-bit processes
894 * HWCAP_S390_HIGH_GPRS is bit 9.
895 */
896 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
897
898 /*
899 * Transactional execution support HWCAP_S390_TE is bit 10.
900 */
901 if (MACHINE_HAS_TE)
902 elf_hwcap |= HWCAP_S390_TE;
903
904 /*
905 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
906 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
907 * instead of facility bit 129.
908 */
909 if (MACHINE_HAS_VX) {
910 elf_hwcap |= HWCAP_S390_VXRS;
911 if (test_facility(134))
912 elf_hwcap |= HWCAP_S390_VXRS_EXT;
913 if (test_facility(135))
914 elf_hwcap |= HWCAP_S390_VXRS_BCD;
915 if (test_facility(148))
916 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
917 if (test_facility(152))
918 elf_hwcap |= HWCAP_S390_VXRS_PDE;
919 }
920 if (test_facility(150))
921 elf_hwcap |= HWCAP_S390_SORT;
922 if (test_facility(151))
923 elf_hwcap |= HWCAP_S390_DFLT;
924
925 /*
926 * Guarded storage support HWCAP_S390_GS is bit 12.
927 */
928 if (MACHINE_HAS_GS)
929 elf_hwcap |= HWCAP_S390_GS;
930
931 get_cpu_id(&cpu_id);
932 add_device_randomness(&cpu_id, sizeof(cpu_id));
933 switch (cpu_id.machine) {
934 case 0x2064:
935 case 0x2066:
936 default: /* Use "z900" as default for 64 bit kernels. */
937 strcpy(elf_platform, "z900");
938 break;
939 case 0x2084:
940 case 0x2086:
941 strcpy(elf_platform, "z990");
942 break;
943 case 0x2094:
944 case 0x2096:
945 strcpy(elf_platform, "z9-109");
946 break;
947 case 0x2097:
948 case 0x2098:
949 strcpy(elf_platform, "z10");
950 break;
951 case 0x2817:
952 case 0x2818:
953 strcpy(elf_platform, "z196");
954 break;
955 case 0x2827:
956 case 0x2828:
957 strcpy(elf_platform, "zEC12");
958 break;
959 case 0x2964:
960 case 0x2965:
961 strcpy(elf_platform, "z13");
962 break;
963 case 0x3906:
964 case 0x3907:
965 strcpy(elf_platform, "z14");
966 break;
967 case 0x8561:
968 case 0x8562:
969 strcpy(elf_platform, "z15");
970 break;
971 }
972
973 /*
974 * Virtualization support HWCAP_INT_SIE is bit 0.
975 */
976 if (sclp.has_sief2)
977 int_hwcap |= HWCAP_INT_SIE;
978
979 return 0;
980}
981arch_initcall(setup_hwcaps);
982
983/*
984 * Add system information as device randomness
985 */
986static void __init setup_randomness(void)
987{
988 struct sysinfo_3_2_2 *vmms;
989
990 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
991 PAGE_SIZE);
992 if (!vmms)
993 panic("Failed to allocate memory for sysinfo structure\n");
994
995 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
996 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
997 memblock_free((unsigned long) vmms, PAGE_SIZE);
998}
999
1000/*
1001 * Find the correct size for the task_struct. This depends on
1002 * the size of the struct fpu at the end of the thread_struct
1003 * which is embedded in the task_struct.
1004 */
1005static void __init setup_task_size(void)
1006{
1007 int task_size = sizeof(struct task_struct);
1008
1009 if (!MACHINE_HAS_VX) {
1010 task_size -= sizeof(__vector128) * __NUM_VXRS;
1011 task_size += sizeof(freg_t) * __NUM_FPRS;
1012 }
1013 arch_task_struct_size = task_size;
1014}
1015
1016/*
1017 * Issue diagnose 318 to set the control program name and
1018 * version codes.
1019 */
1020static void __init setup_control_program_code(void)
1021{
1022 union diag318_info diag318_info = {
1023 .cpnc = CPNC_LINUX,
1024 .cpvc = 0,
1025 };
1026
1027 if (!sclp.has_diag318)
1028 return;
1029
1030 diag_stat_inc(DIAG_STAT_X318);
1031 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1032}
1033
1034/*
1035 * Print the component list from the IPL report
1036 */
1037static void __init log_component_list(void)
1038{
1039 struct ipl_rb_component_entry *ptr, *end;
1040 char *str;
1041
1042 if (!early_ipl_comp_list_addr)
1043 return;
1044 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1045 pr_info("Linux is running with Secure-IPL enabled\n");
1046 else
1047 pr_info("Linux is running with Secure-IPL disabled\n");
1048 ptr = (void *) early_ipl_comp_list_addr;
1049 end = (void *) ptr + early_ipl_comp_list_size;
1050 pr_info("The IPL report contains the following components:\n");
1051 while (ptr < end) {
1052 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1053 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1054 str = "signed, verified";
1055 else
1056 str = "signed, verification failed";
1057 } else {
1058 str = "not signed";
1059 }
1060 pr_info("%016llx - %016llx (%s)\n",
1061 ptr->addr, ptr->addr + ptr->len, str);
1062 ptr++;
1063 }
1064}
1065
1066/*
1067 * Setup function called from init/main.c just after the banner
1068 * was printed.
1069 */
1070
1071void __init setup_arch(char **cmdline_p)
1072{
1073 /*
1074 * print what head.S has found out about the machine
1075 */
1076 if (MACHINE_IS_VM)
1077 pr_info("Linux is running as a z/VM "
1078 "guest operating system in 64-bit mode\n");
1079 else if (MACHINE_IS_KVM)
1080 pr_info("Linux is running under KVM in 64-bit mode\n");
1081 else if (MACHINE_IS_LPAR)
1082 pr_info("Linux is running natively in 64-bit mode\n");
1083 else
1084 pr_info("Linux is running as a guest in 64-bit mode\n");
1085
1086 log_component_list();
1087
1088 /* Have one command line that is parsed and saved in /proc/cmdline */
1089 /* boot_command_line has been already set up in early.c */
1090 *cmdline_p = boot_command_line;
1091
1092 ROOT_DEV = Root_RAM0;
1093
1094 init_mm.start_code = (unsigned long) _text;
1095 init_mm.end_code = (unsigned long) _etext;
1096 init_mm.end_data = (unsigned long) _edata;
1097 init_mm.brk = (unsigned long) _end;
1098
1099 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1100 nospec_auto_detect();
1101
1102 jump_label_init();
1103 parse_early_param();
1104#ifdef CONFIG_CRASH_DUMP
1105 /* Deactivate elfcorehdr= kernel parameter */
1106 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1107#endif
1108
1109 os_info_init();
1110 setup_ipl();
1111 setup_task_size();
1112 setup_control_program_code();
1113
1114 /* Do some memory reservations *before* memory is added to memblock */
1115 reserve_memory_end();
1116 reserve_oldmem();
1117 reserve_kernel();
1118 reserve_initrd();
1119 reserve_certificate_list();
1120 reserve_mem_detect_info();
1121 memblock_allow_resize();
1122
1123 /* Get information about *all* installed memory */
1124 memblock_add_mem_detect_info();
1125
1126 free_mem_detect_info();
1127 remove_oldmem();
1128
1129 if (is_prot_virt_host())
1130 setup_uv();
1131 setup_memory_end();
1132 setup_memory();
1133 dma_contiguous_reserve(memory_end);
1134 vmcp_cma_reserve();
1135
1136 check_initrd();
1137 reserve_crashkernel();
1138#ifdef CONFIG_CRASH_DUMP
1139 /*
1140 * Be aware that smp_save_dump_cpus() triggers a system reset.
1141 * Therefore CPU and device initialization should be done afterwards.
1142 */
1143 smp_save_dump_cpus();
1144#endif
1145
1146 setup_resources();
1147 setup_lowcore_dat_off();
1148 smp_fill_possible_mask();
1149 cpu_detect_mhz_feature();
1150 cpu_init();
1151 numa_setup();
1152 smp_detect_cpus();
1153 topology_init_early();
1154
1155 /*
1156 * Create kernel page tables and switch to virtual addressing.
1157 */
1158 paging_init();
1159
1160 /*
1161 * After paging_init created the kernel page table, the new PSWs
1162 * in lowcore can now run with DAT enabled.
1163 */
1164 setup_lowcore_dat_on();
1165
1166 /* Setup default console */
1167 conmode_default();
1168 set_preferred_console();
1169
1170 apply_alternative_instructions();
1171 if (IS_ENABLED(CONFIG_EXPOLINE))
1172 nospec_init_branches();
1173
1174 /* Setup zfcpdump support */
1175 setup_zfcpdump();
1176
1177 /* Add system specific data to the random pool */
1178 setup_randomness();
1179}