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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12 /*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16 #define KMSG_COMPONENT "setup"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19 #include <linux/errno.h>
20 #include <linux/export.h>
21 #include <linux/sched.h>
22 #include <linux/sched/task.h>
23 #include <linux/cpu.h>
24 #include <linux/kernel.h>
25 #include <linux/memblock.h>
26 #include <linux/mm.h>
27 #include <linux/stddef.h>
28 #include <linux/unistd.h>
29 #include <linux/ptrace.h>
30 #include <linux/random.h>
31 #include <linux/user.h>
32 #include <linux/tty.h>
33 #include <linux/ioport.h>
34 #include <linux/delay.h>
35 #include <linux/init.h>
36 #include <linux/initrd.h>
37 #include <linux/root_dev.h>
38 #include <linux/console.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/dma-contiguous.h>
41 #include <linux/device.h>
42 #include <linux/notifier.h>
43 #include <linux/pfn.h>
44 #include <linux/ctype.h>
45 #include <linux/reboot.h>
46 #include <linux/topology.h>
47 #include <linux/kexec.h>
48 #include <linux/crash_dump.h>
49 #include <linux/memory.h>
50 #include <linux/compat.h>
51 #include <linux/start_kernel.h>
52
53 #include <asm/boot_data.h>
54 #include <asm/ipl.h>
55 #include <asm/facility.h>
56 #include <asm/smp.h>
57 #include <asm/mmu_context.h>
58 #include <asm/cpcmd.h>
59 #include <asm/lowcore.h>
60 #include <asm/nmi.h>
61 #include <asm/irq.h>
62 #include <asm/page.h>
63 #include <asm/ptrace.h>
64 #include <asm/sections.h>
65 #include <asm/ebcdic.h>
66 #include <asm/diag.h>
67 #include <asm/os_info.h>
68 #include <asm/sclp.h>
69 #include <asm/stacktrace.h>
70 #include <asm/sysinfo.h>
71 #include <asm/numa.h>
72 #include <asm/alternative.h>
73 #include <asm/nospec-branch.h>
74 #include <asm/mem_detect.h>
75 #include <asm/uv.h>
76 #include "entry.h"
77
78 /*
79 * Machine setup..
80 */
81 unsigned int console_mode = 0;
82 EXPORT_SYMBOL(console_mode);
83
84 unsigned int console_devno = -1;
85 EXPORT_SYMBOL(console_devno);
86
87 unsigned int console_irq = -1;
88 EXPORT_SYMBOL(console_irq);
89
90 unsigned long elf_hwcap __read_mostly = 0;
91 char elf_platform[ELF_PLATFORM_SIZE];
92
93 unsigned long int_hwcap = 0;
94
95 int __bootdata(noexec_disabled);
96 int __bootdata(memory_end_set);
97 unsigned long __bootdata(memory_end);
98 unsigned long __bootdata(vmalloc_size);
99 unsigned long __bootdata(max_physmem_end);
100 struct mem_detect_info __bootdata(mem_detect);
101
102 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
103 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
104 unsigned long __bootdata_preserved(__swsusp_reset_dma);
105 unsigned long __bootdata_preserved(__stext_dma);
106 unsigned long __bootdata_preserved(__etext_dma);
107 unsigned long __bootdata_preserved(__sdma);
108 unsigned long __bootdata_preserved(__edma);
109 unsigned long __bootdata_preserved(__kaslr_offset);
110 unsigned int __bootdata_preserved(zlib_dfltcc_support);
111 EXPORT_SYMBOL(zlib_dfltcc_support);
112
113 unsigned long VMALLOC_START;
114 EXPORT_SYMBOL(VMALLOC_START);
115
116 unsigned long VMALLOC_END;
117 EXPORT_SYMBOL(VMALLOC_END);
118
119 struct page *vmemmap;
120 EXPORT_SYMBOL(vmemmap);
121
122 unsigned long MODULES_VADDR;
123 unsigned long MODULES_END;
124
125 /* An array with a pointer to the lowcore of every CPU. */
126 struct lowcore *lowcore_ptr[NR_CPUS];
127 EXPORT_SYMBOL(lowcore_ptr);
128
129 /*
130 * This is set up by the setup-routine at boot-time
131 * for S390 need to find out, what we have to setup
132 * using address 0x10400 ...
133 */
134
135 #include <asm/setup.h>
136
137 /*
138 * condev= and conmode= setup parameter.
139 */
140
141 static int __init condev_setup(char *str)
142 {
143 int vdev;
144
145 vdev = simple_strtoul(str, &str, 0);
146 if (vdev >= 0 && vdev < 65536) {
147 console_devno = vdev;
148 console_irq = -1;
149 }
150 return 1;
151 }
152
153 __setup("condev=", condev_setup);
154
155 static void __init set_preferred_console(void)
156 {
157 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
158 add_preferred_console("ttyS", 0, NULL);
159 else if (CONSOLE_IS_3270)
160 add_preferred_console("tty3270", 0, NULL);
161 else if (CONSOLE_IS_VT220)
162 add_preferred_console("ttyS", 1, NULL);
163 else if (CONSOLE_IS_HVC)
164 add_preferred_console("hvc", 0, NULL);
165 }
166
167 static int __init conmode_setup(char *str)
168 {
169 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
170 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
171 SET_CONSOLE_SCLP;
172 #endif
173 #if defined(CONFIG_TN3215_CONSOLE)
174 if (!strcmp(str, "3215"))
175 SET_CONSOLE_3215;
176 #endif
177 #if defined(CONFIG_TN3270_CONSOLE)
178 if (!strcmp(str, "3270"))
179 SET_CONSOLE_3270;
180 #endif
181 set_preferred_console();
182 return 1;
183 }
184
185 __setup("conmode=", conmode_setup);
186
187 static void __init conmode_default(void)
188 {
189 char query_buffer[1024];
190 char *ptr;
191
192 if (MACHINE_IS_VM) {
193 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
194 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
195 ptr = strstr(query_buffer, "SUBCHANNEL =");
196 console_irq = simple_strtoul(ptr + 13, NULL, 16);
197 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
198 ptr = strstr(query_buffer, "CONMODE");
199 /*
200 * Set the conmode to 3215 so that the device recognition
201 * will set the cu_type of the console to 3215. If the
202 * conmode is 3270 and we don't set it back then both
203 * 3215 and the 3270 driver will try to access the console
204 * device (3215 as console and 3270 as normal tty).
205 */
206 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
207 if (ptr == NULL) {
208 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 SET_CONSOLE_SCLP;
210 #endif
211 return;
212 }
213 if (str_has_prefix(ptr + 8, "3270")) {
214 #if defined(CONFIG_TN3270_CONSOLE)
215 SET_CONSOLE_3270;
216 #elif defined(CONFIG_TN3215_CONSOLE)
217 SET_CONSOLE_3215;
218 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
219 SET_CONSOLE_SCLP;
220 #endif
221 } else if (str_has_prefix(ptr + 8, "3215")) {
222 #if defined(CONFIG_TN3215_CONSOLE)
223 SET_CONSOLE_3215;
224 #elif defined(CONFIG_TN3270_CONSOLE)
225 SET_CONSOLE_3270;
226 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
227 SET_CONSOLE_SCLP;
228 #endif
229 }
230 } else if (MACHINE_IS_KVM) {
231 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
232 SET_CONSOLE_VT220;
233 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
234 SET_CONSOLE_SCLP;
235 else
236 SET_CONSOLE_HVC;
237 } else {
238 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
239 SET_CONSOLE_SCLP;
240 #endif
241 }
242 }
243
244 #ifdef CONFIG_CRASH_DUMP
245 static void __init setup_zfcpdump(void)
246 {
247 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
248 return;
249 if (OLDMEM_BASE)
250 return;
251 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
252 console_loglevel = 2;
253 }
254 #else
255 static inline void setup_zfcpdump(void) {}
256 #endif /* CONFIG_CRASH_DUMP */
257
258 /*
259 * Reboot, halt and power_off stubs. They just call _machine_restart,
260 * _machine_halt or _machine_power_off.
261 */
262
263 void machine_restart(char *command)
264 {
265 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
266 /*
267 * Only unblank the console if we are called in enabled
268 * context or a bust_spinlocks cleared the way for us.
269 */
270 console_unblank();
271 _machine_restart(command);
272 }
273
274 void machine_halt(void)
275 {
276 if (!in_interrupt() || oops_in_progress)
277 /*
278 * Only unblank the console if we are called in enabled
279 * context or a bust_spinlocks cleared the way for us.
280 */
281 console_unblank();
282 _machine_halt();
283 }
284
285 void machine_power_off(void)
286 {
287 if (!in_interrupt() || oops_in_progress)
288 /*
289 * Only unblank the console if we are called in enabled
290 * context or a bust_spinlocks cleared the way for us.
291 */
292 console_unblank();
293 _machine_power_off();
294 }
295
296 /*
297 * Dummy power off function.
298 */
299 void (*pm_power_off)(void) = machine_power_off;
300 EXPORT_SYMBOL_GPL(pm_power_off);
301
302 void *restart_stack __section(.data);
303
304 unsigned long stack_alloc(void)
305 {
306 #ifdef CONFIG_VMAP_STACK
307 return (unsigned long)
308 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
309 VMALLOC_START, VMALLOC_END,
310 THREADINFO_GFP,
311 PAGE_KERNEL, 0, NUMA_NO_NODE,
312 __builtin_return_address(0));
313 #else
314 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
315 #endif
316 }
317
318 void stack_free(unsigned long stack)
319 {
320 #ifdef CONFIG_VMAP_STACK
321 vfree((void *) stack);
322 #else
323 free_pages(stack, THREAD_SIZE_ORDER);
324 #endif
325 }
326
327 int __init arch_early_irq_init(void)
328 {
329 unsigned long stack;
330
331 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
332 if (!stack)
333 panic("Couldn't allocate async stack");
334 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
335 return 0;
336 }
337
338 static int __init async_stack_realloc(void)
339 {
340 unsigned long old, new;
341
342 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
343 new = stack_alloc();
344 if (!new)
345 panic("Couldn't allocate async stack");
346 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
347 free_pages(old, THREAD_SIZE_ORDER);
348 return 0;
349 }
350 early_initcall(async_stack_realloc);
351
352 void __init arch_call_rest_init(void)
353 {
354 unsigned long stack;
355
356 stack = stack_alloc();
357 if (!stack)
358 panic("Couldn't allocate kernel stack");
359 current->stack = (void *) stack;
360 #ifdef CONFIG_VMAP_STACK
361 current->stack_vm_area = (void *) stack;
362 #endif
363 set_task_stack_end_magic(current);
364 stack += STACK_INIT_OFFSET;
365 S390_lowcore.kernel_stack = stack;
366 CALL_ON_STACK_NORETURN(rest_init, stack);
367 }
368
369 static void __init setup_lowcore_dat_off(void)
370 {
371 struct lowcore *lc;
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 = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
385 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
386 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
387 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
388 lc->svc_new_psw.addr = (unsigned long) system_call;
389 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
390 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
391 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
392 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
393 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
394 lc->io_new_psw.addr = (unsigned long) io_int_handler;
395 lc->clock_comparator = clock_comparator_max;
396 lc->nodat_stack = ((unsigned long) &init_thread_union)
397 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
398 lc->current_task = (unsigned long)&init_task;
399 lc->lpp = LPP_MAGIC;
400 lc->machine_flags = S390_lowcore.machine_flags;
401 lc->preempt_count = S390_lowcore.preempt_count;
402 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
403 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
404 sizeof(lc->stfle_fac_list));
405 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
406 sizeof(lc->alt_stfle_fac_list));
407 nmi_alloc_boot_cpu(lc);
408 vdso_alloc_boot_cpu(lc);
409 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
410 lc->async_enter_timer = S390_lowcore.async_enter_timer;
411 lc->exit_timer = S390_lowcore.exit_timer;
412 lc->user_timer = S390_lowcore.user_timer;
413 lc->system_timer = S390_lowcore.system_timer;
414 lc->steal_timer = S390_lowcore.steal_timer;
415 lc->last_update_timer = S390_lowcore.last_update_timer;
416 lc->last_update_clock = S390_lowcore.last_update_clock;
417
418 /*
419 * Allocate the global restart stack which is the same for
420 * all CPUs in cast *one* of them does a PSW restart.
421 */
422 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
423 if (!restart_stack)
424 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
425 __func__, THREAD_SIZE, THREAD_SIZE);
426 restart_stack += STACK_INIT_OFFSET;
427
428 /*
429 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
430 * restart data to the absolute zero lowcore. This is necessary if
431 * PSW restart is done on an offline CPU that has lowcore zero.
432 */
433 lc->restart_stack = (unsigned long) restart_stack;
434 lc->restart_fn = (unsigned long) do_restart;
435 lc->restart_data = 0;
436 lc->restart_source = -1UL;
437
438 /* Setup absolute zero lowcore */
439 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
440 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
441 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
442 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
443 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
444
445 lc->spinlock_lockval = arch_spin_lockval(0);
446 lc->spinlock_index = 0;
447 arch_spin_lock_setup(0);
448 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
449
450 set_prefix((u32)(unsigned long) lc);
451 lowcore_ptr[0] = lc;
452 }
453
454 static void __init setup_lowcore_dat_on(void)
455 {
456 __ctl_clear_bit(0, 28);
457 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
458 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
459 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
460 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
461 __ctl_set_bit(0, 28);
462 }
463
464 static struct resource code_resource = {
465 .name = "Kernel code",
466 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
467 };
468
469 static struct resource data_resource = {
470 .name = "Kernel data",
471 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
472 };
473
474 static struct resource bss_resource = {
475 .name = "Kernel bss",
476 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
477 };
478
479 static struct resource __initdata *standard_resources[] = {
480 &code_resource,
481 &data_resource,
482 &bss_resource,
483 };
484
485 static void __init setup_resources(void)
486 {
487 struct resource *res, *std_res, *sub_res;
488 struct memblock_region *reg;
489 int j;
490
491 code_resource.start = (unsigned long) _text;
492 code_resource.end = (unsigned long) _etext - 1;
493 data_resource.start = (unsigned long) _etext;
494 data_resource.end = (unsigned long) _edata - 1;
495 bss_resource.start = (unsigned long) __bss_start;
496 bss_resource.end = (unsigned long) __bss_stop - 1;
497
498 for_each_memblock(memory, reg) {
499 res = memblock_alloc(sizeof(*res), 8);
500 if (!res)
501 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
502 __func__, sizeof(*res), 8);
503 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
504
505 res->name = "System RAM";
506 res->start = reg->base;
507 res->end = reg->base + reg->size - 1;
508 request_resource(&iomem_resource, res);
509
510 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
511 std_res = standard_resources[j];
512 if (std_res->start < res->start ||
513 std_res->start > res->end)
514 continue;
515 if (std_res->end > res->end) {
516 sub_res = memblock_alloc(sizeof(*sub_res), 8);
517 if (!sub_res)
518 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
519 __func__, sizeof(*sub_res), 8);
520 *sub_res = *std_res;
521 sub_res->end = res->end;
522 std_res->start = res->end + 1;
523 request_resource(res, sub_res);
524 } else {
525 request_resource(res, std_res);
526 }
527 }
528 }
529 #ifdef CONFIG_CRASH_DUMP
530 /*
531 * Re-add removed crash kernel memory as reserved memory. This makes
532 * sure it will be mapped with the identity mapping and struct pages
533 * will be created, so it can be resized later on.
534 * However add it later since the crash kernel resource should not be
535 * part of the System RAM resource.
536 */
537 if (crashk_res.end) {
538 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
539 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
540 insert_resource(&iomem_resource, &crashk_res);
541 }
542 #endif
543 }
544
545 static void __init setup_memory_end(void)
546 {
547 unsigned long vmax, tmp;
548
549 /* Choose kernel address space layout: 3 or 4 levels. */
550 if (IS_ENABLED(CONFIG_KASAN)) {
551 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
552 ? _REGION1_SIZE
553 : _REGION2_SIZE;
554 } else {
555 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
556 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
557 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
558 vmax = _REGION2_SIZE; /* 3-level kernel page table */
559 else
560 vmax = _REGION1_SIZE; /* 4-level kernel page table */
561 }
562
563 if (is_prot_virt_host())
564 adjust_to_uv_max(&vmax);
565
566 /* module area is at the end of the kernel address space. */
567 MODULES_END = vmax;
568 MODULES_VADDR = MODULES_END - MODULES_LEN;
569 VMALLOC_END = MODULES_VADDR;
570 VMALLOC_START = VMALLOC_END - vmalloc_size;
571
572 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
573 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
574 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
575 tmp = SECTION_ALIGN_UP(tmp);
576 tmp = VMALLOC_START - tmp * sizeof(struct page);
577 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
578 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
579 vmemmap = (struct page *) tmp;
580
581 /* Take care that memory_end is set and <= vmemmap */
582 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
583 #ifdef CONFIG_KASAN
584 /* fit in kasan shadow memory region between 1:1 and vmemmap */
585 memory_end = min(memory_end, KASAN_SHADOW_START);
586 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
587 #endif
588 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
589 memblock_remove(memory_end, ULONG_MAX);
590
591 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
592 }
593
594 #ifdef CONFIG_CRASH_DUMP
595
596 /*
597 * When kdump is enabled, we have to ensure that no memory from
598 * the area [0 - crashkernel memory size] and
599 * [crashk_res.start - crashk_res.end] is set offline.
600 */
601 static 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 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
611 return NOTIFY_OK;
612 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
613 return NOTIFY_OK;
614 return NOTIFY_BAD;
615 }
616
617 static struct notifier_block kdump_mem_nb = {
618 .notifier_call = kdump_mem_notifier,
619 };
620
621 #endif
622
623 /*
624 * Make sure that the area behind memory_end is protected
625 */
626 static void reserve_memory_end(void)
627 {
628 if (memory_end_set)
629 memblock_reserve(memory_end, ULONG_MAX);
630 }
631
632 /*
633 * Make sure that oldmem, where the dump is stored, is protected
634 */
635 static void reserve_oldmem(void)
636 {
637 #ifdef CONFIG_CRASH_DUMP
638 if (OLDMEM_BASE)
639 /* Forget all memory above the running kdump system */
640 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
641 #endif
642 }
643
644 /*
645 * Make sure that oldmem, where the dump is stored, is protected
646 */
647 static void remove_oldmem(void)
648 {
649 #ifdef CONFIG_CRASH_DUMP
650 if (OLDMEM_BASE)
651 /* Forget all memory above the running kdump system */
652 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
653 #endif
654 }
655
656 /*
657 * Reserve memory for kdump kernel to be loaded with kexec
658 */
659 static void __init reserve_crashkernel(void)
660 {
661 #ifdef CONFIG_CRASH_DUMP
662 unsigned long long crash_base, crash_size;
663 phys_addr_t low, high;
664 int rc;
665
666 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
667 &crash_base);
668
669 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
670 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
671 if (rc || crash_size == 0)
672 return;
673
674 if (memblock.memory.regions[0].size < crash_size) {
675 pr_info("crashkernel reservation failed: %s\n",
676 "first memory chunk must be at least crashkernel size");
677 return;
678 }
679
680 low = crash_base ?: OLDMEM_BASE;
681 high = low + crash_size;
682 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
683 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
684 crash_base = low;
685 } else {
686 /* Find suitable area in free memory */
687 low = max_t(unsigned long, crash_size, sclp.hsa_size);
688 high = crash_base ? crash_base + crash_size : ULONG_MAX;
689
690 if (crash_base && crash_base < low) {
691 pr_info("crashkernel reservation failed: %s\n",
692 "crash_base too low");
693 return;
694 }
695 low = crash_base ?: low;
696 crash_base = memblock_find_in_range(low, high, crash_size,
697 KEXEC_CRASH_MEM_ALIGN);
698 }
699
700 if (!crash_base) {
701 pr_info("crashkernel reservation failed: %s\n",
702 "no suitable area found");
703 return;
704 }
705
706 if (register_memory_notifier(&kdump_mem_nb))
707 return;
708
709 if (!OLDMEM_BASE && MACHINE_IS_VM)
710 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
711 crashk_res.start = crash_base;
712 crashk_res.end = crash_base + crash_size - 1;
713 memblock_remove(crash_base, crash_size);
714 pr_info("Reserving %lluMB of memory at %lluMB "
715 "for crashkernel (System RAM: %luMB)\n",
716 crash_size >> 20, crash_base >> 20,
717 (unsigned long)memblock.memory.total_size >> 20);
718 os_info_crashkernel_add(crash_base, crash_size);
719 #endif
720 }
721
722 /*
723 * Reserve the initrd from being used by memblock
724 */
725 static void __init reserve_initrd(void)
726 {
727 #ifdef CONFIG_BLK_DEV_INITRD
728 if (!INITRD_START || !INITRD_SIZE)
729 return;
730 initrd_start = INITRD_START;
731 initrd_end = initrd_start + INITRD_SIZE;
732 memblock_reserve(INITRD_START, INITRD_SIZE);
733 #endif
734 }
735
736 /*
737 * Reserve the memory area used to pass the certificate lists
738 */
739 static void __init reserve_certificate_list(void)
740 {
741 if (ipl_cert_list_addr)
742 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
743 }
744
745 static void __init reserve_mem_detect_info(void)
746 {
747 unsigned long start, size;
748
749 get_mem_detect_reserved(&start, &size);
750 if (size)
751 memblock_reserve(start, size);
752 }
753
754 static void __init free_mem_detect_info(void)
755 {
756 unsigned long start, size;
757
758 get_mem_detect_reserved(&start, &size);
759 if (size)
760 memblock_free(start, size);
761 }
762
763 static const char * __init get_mem_info_source(void)
764 {
765 switch (mem_detect.info_source) {
766 case MEM_DETECT_SCLP_STOR_INFO:
767 return "sclp storage info";
768 case MEM_DETECT_DIAG260:
769 return "diag260";
770 case MEM_DETECT_SCLP_READ_INFO:
771 return "sclp read info";
772 case MEM_DETECT_BIN_SEARCH:
773 return "binary search";
774 }
775 return "none";
776 }
777
778 static void __init memblock_add_mem_detect_info(void)
779 {
780 unsigned long start, end;
781 int i;
782
783 memblock_dbg("physmem info source: %s (%hhd)\n",
784 get_mem_info_source(), mem_detect.info_source);
785 /* keep memblock lists close to the kernel */
786 memblock_set_bottom_up(true);
787 for_each_mem_detect_block(i, &start, &end) {
788 memblock_add(start, end - start);
789 memblock_physmem_add(start, end - start);
790 }
791 memblock_set_bottom_up(false);
792 memblock_dump_all();
793 }
794
795 /*
796 * Check for initrd being in usable memory
797 */
798 static void __init check_initrd(void)
799 {
800 #ifdef CONFIG_BLK_DEV_INITRD
801 if (INITRD_START && INITRD_SIZE &&
802 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
803 pr_err("The initial RAM disk does not fit into the memory\n");
804 memblock_free(INITRD_START, INITRD_SIZE);
805 initrd_start = initrd_end = 0;
806 }
807 #endif
808 }
809
810 /*
811 * Reserve memory used for lowcore/command line/kernel image.
812 */
813 static void __init reserve_kernel(void)
814 {
815 unsigned long start_pfn = PFN_UP(__pa(_end));
816
817 memblock_reserve(0, HEAD_END);
818 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
819 - (unsigned long)_stext);
820 memblock_reserve(__sdma, __edma - __sdma);
821 }
822
823 static void __init setup_memory(void)
824 {
825 struct memblock_region *reg;
826
827 /*
828 * Init storage key for present memory
829 */
830 for_each_memblock(memory, reg) {
831 storage_key_init_range(reg->base, reg->base + reg->size);
832 }
833 psw_set_key(PAGE_DEFAULT_KEY);
834
835 /* Only cosmetics */
836 memblock_enforce_memory_limit(memblock_end_of_DRAM());
837 }
838
839 /*
840 * Setup hardware capabilities.
841 */
842 static int __init setup_hwcaps(void)
843 {
844 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
845 struct cpuid cpu_id;
846 int i;
847
848 /*
849 * The store facility list bits numbers as found in the principles
850 * of operation are numbered with bit 1UL<<31 as number 0 to
851 * bit 1UL<<0 as number 31.
852 * Bit 0: instructions named N3, "backported" to esa-mode
853 * Bit 2: z/Architecture mode is active
854 * Bit 7: the store-facility-list-extended facility is installed
855 * Bit 17: the message-security assist is installed
856 * Bit 19: the long-displacement facility is installed
857 * Bit 21: the extended-immediate facility is installed
858 * Bit 22: extended-translation facility 3 is installed
859 * Bit 30: extended-translation facility 3 enhancement facility
860 * These get translated to:
861 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
862 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
863 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
864 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
865 */
866 for (i = 0; i < 6; i++)
867 if (test_facility(stfl_bits[i]))
868 elf_hwcap |= 1UL << i;
869
870 if (test_facility(22) && test_facility(30))
871 elf_hwcap |= HWCAP_S390_ETF3EH;
872
873 /*
874 * Check for additional facilities with store-facility-list-extended.
875 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
876 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
877 * as stored by stfl, bits 32-xxx contain additional facilities.
878 * How many facility words are stored depends on the number of
879 * doublewords passed to the instruction. The additional facilities
880 * are:
881 * Bit 42: decimal floating point facility is installed
882 * Bit 44: perform floating point operation facility is installed
883 * translated to:
884 * HWCAP_S390_DFP bit 6 (42 && 44).
885 */
886 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
887 elf_hwcap |= HWCAP_S390_DFP;
888
889 /*
890 * Huge page support HWCAP_S390_HPAGE is bit 7.
891 */
892 if (MACHINE_HAS_EDAT1)
893 elf_hwcap |= HWCAP_S390_HPAGE;
894
895 /*
896 * 64-bit register support for 31-bit processes
897 * HWCAP_S390_HIGH_GPRS is bit 9.
898 */
899 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
900
901 /*
902 * Transactional execution support HWCAP_S390_TE is bit 10.
903 */
904 if (MACHINE_HAS_TE)
905 elf_hwcap |= HWCAP_S390_TE;
906
907 /*
908 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
909 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
910 * instead of facility bit 129.
911 */
912 if (MACHINE_HAS_VX) {
913 elf_hwcap |= HWCAP_S390_VXRS;
914 if (test_facility(134))
915 elf_hwcap |= HWCAP_S390_VXRS_EXT;
916 if (test_facility(135))
917 elf_hwcap |= HWCAP_S390_VXRS_BCD;
918 if (test_facility(148))
919 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
920 if (test_facility(152))
921 elf_hwcap |= HWCAP_S390_VXRS_PDE;
922 }
923 if (test_facility(150))
924 elf_hwcap |= HWCAP_S390_SORT;
925 if (test_facility(151))
926 elf_hwcap |= HWCAP_S390_DFLT;
927
928 /*
929 * Guarded storage support HWCAP_S390_GS is bit 12.
930 */
931 if (MACHINE_HAS_GS)
932 elf_hwcap |= HWCAP_S390_GS;
933
934 get_cpu_id(&cpu_id);
935 add_device_randomness(&cpu_id, sizeof(cpu_id));
936 switch (cpu_id.machine) {
937 case 0x2064:
938 case 0x2066:
939 default: /* Use "z900" as default for 64 bit kernels. */
940 strcpy(elf_platform, "z900");
941 break;
942 case 0x2084:
943 case 0x2086:
944 strcpy(elf_platform, "z990");
945 break;
946 case 0x2094:
947 case 0x2096:
948 strcpy(elf_platform, "z9-109");
949 break;
950 case 0x2097:
951 case 0x2098:
952 strcpy(elf_platform, "z10");
953 break;
954 case 0x2817:
955 case 0x2818:
956 strcpy(elf_platform, "z196");
957 break;
958 case 0x2827:
959 case 0x2828:
960 strcpy(elf_platform, "zEC12");
961 break;
962 case 0x2964:
963 case 0x2965:
964 strcpy(elf_platform, "z13");
965 break;
966 case 0x3906:
967 case 0x3907:
968 strcpy(elf_platform, "z14");
969 break;
970 case 0x8561:
971 case 0x8562:
972 strcpy(elf_platform, "z15");
973 break;
974 }
975
976 /*
977 * Virtualization support HWCAP_INT_SIE is bit 0.
978 */
979 if (sclp.has_sief2)
980 int_hwcap |= HWCAP_INT_SIE;
981
982 return 0;
983 }
984 arch_initcall(setup_hwcaps);
985
986 /*
987 * Add system information as device randomness
988 */
989 static void __init setup_randomness(void)
990 {
991 struct sysinfo_3_2_2 *vmms;
992
993 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
994 PAGE_SIZE);
995 if (!vmms)
996 panic("Failed to allocate memory for sysinfo structure\n");
997
998 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
999 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
1000 memblock_free((unsigned long) vmms, PAGE_SIZE);
1001 }
1002
1003 /*
1004 * Find the correct size for the task_struct. This depends on
1005 * the size of the struct fpu at the end of the thread_struct
1006 * which is embedded in the task_struct.
1007 */
1008 static void __init setup_task_size(void)
1009 {
1010 int task_size = sizeof(struct task_struct);
1011
1012 if (!MACHINE_HAS_VX) {
1013 task_size -= sizeof(__vector128) * __NUM_VXRS;
1014 task_size += sizeof(freg_t) * __NUM_FPRS;
1015 }
1016 arch_task_struct_size = task_size;
1017 }
1018
1019 /*
1020 * Issue diagnose 318 to set the control program name and
1021 * version codes.
1022 */
1023 static void __init setup_control_program_code(void)
1024 {
1025 union diag318_info diag318_info = {
1026 .cpnc = CPNC_LINUX,
1027 .cpvc_linux = 0,
1028 .cpvc_distro = {0},
1029 };
1030
1031 if (!sclp.has_diag318)
1032 return;
1033
1034 diag_stat_inc(DIAG_STAT_X318);
1035 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1036 }
1037
1038 /*
1039 * Print the component list from the IPL report
1040 */
1041 static void __init log_component_list(void)
1042 {
1043 struct ipl_rb_component_entry *ptr, *end;
1044 char *str;
1045
1046 if (!early_ipl_comp_list_addr)
1047 return;
1048 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1049 pr_info("Linux is running with Secure-IPL enabled\n");
1050 else
1051 pr_info("Linux is running with Secure-IPL disabled\n");
1052 ptr = (void *) early_ipl_comp_list_addr;
1053 end = (void *) ptr + early_ipl_comp_list_size;
1054 pr_info("The IPL report contains the following components:\n");
1055 while (ptr < end) {
1056 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1057 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1058 str = "signed, verified";
1059 else
1060 str = "signed, verification failed";
1061 } else {
1062 str = "not signed";
1063 }
1064 pr_info("%016llx - %016llx (%s)\n",
1065 ptr->addr, ptr->addr + ptr->len, str);
1066 ptr++;
1067 }
1068 }
1069
1070 /*
1071 * Setup function called from init/main.c just after the banner
1072 * was printed.
1073 */
1074
1075 void __init setup_arch(char **cmdline_p)
1076 {
1077 /*
1078 * print what head.S has found out about the machine
1079 */
1080 if (MACHINE_IS_VM)
1081 pr_info("Linux is running as a z/VM "
1082 "guest operating system in 64-bit mode\n");
1083 else if (MACHINE_IS_KVM)
1084 pr_info("Linux is running under KVM in 64-bit mode\n");
1085 else if (MACHINE_IS_LPAR)
1086 pr_info("Linux is running natively in 64-bit mode\n");
1087 else
1088 pr_info("Linux is running as a guest in 64-bit mode\n");
1089
1090 log_component_list();
1091
1092 /* Have one command line that is parsed and saved in /proc/cmdline */
1093 /* boot_command_line has been already set up in early.c */
1094 *cmdline_p = boot_command_line;
1095
1096 ROOT_DEV = Root_RAM0;
1097
1098 init_mm.start_code = (unsigned long) _text;
1099 init_mm.end_code = (unsigned long) _etext;
1100 init_mm.end_data = (unsigned long) _edata;
1101 init_mm.brk = (unsigned long) _end;
1102
1103 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1104 nospec_auto_detect();
1105
1106 parse_early_param();
1107 #ifdef CONFIG_CRASH_DUMP
1108 /* Deactivate elfcorehdr= kernel parameter */
1109 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1110 #endif
1111
1112 os_info_init();
1113 setup_ipl();
1114 setup_task_size();
1115 setup_control_program_code();
1116
1117 /* Do some memory reservations *before* memory is added to memblock */
1118 reserve_memory_end();
1119 reserve_oldmem();
1120 reserve_kernel();
1121 reserve_initrd();
1122 reserve_certificate_list();
1123 reserve_mem_detect_info();
1124 memblock_allow_resize();
1125
1126 /* Get information about *all* installed memory */
1127 memblock_add_mem_detect_info();
1128
1129 free_mem_detect_info();
1130 remove_oldmem();
1131
1132 /*
1133 * Make sure all chunks are MAX_ORDER aligned so we don't need the
1134 * extra checks that HOLES_IN_ZONE would require.
1135 *
1136 * Is this still required?
1137 */
1138 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
1139
1140 if (is_prot_virt_host())
1141 setup_uv();
1142 setup_memory_end();
1143 setup_memory();
1144 dma_contiguous_reserve(memory_end);
1145 vmcp_cma_reserve();
1146
1147 check_initrd();
1148 reserve_crashkernel();
1149 #ifdef CONFIG_CRASH_DUMP
1150 /*
1151 * Be aware that smp_save_dump_cpus() triggers a system reset.
1152 * Therefore CPU and device initialization should be done afterwards.
1153 */
1154 smp_save_dump_cpus();
1155 #endif
1156
1157 setup_resources();
1158 setup_lowcore_dat_off();
1159 smp_fill_possible_mask();
1160 cpu_detect_mhz_feature();
1161 cpu_init();
1162 numa_setup();
1163 smp_detect_cpus();
1164 topology_init_early();
1165
1166 /*
1167 * Create kernel page tables and switch to virtual addressing.
1168 */
1169 paging_init();
1170
1171 /*
1172 * After paging_init created the kernel page table, the new PSWs
1173 * in lowcore can now run with DAT enabled.
1174 */
1175 setup_lowcore_dat_on();
1176
1177 /* Setup default console */
1178 conmode_default();
1179 set_preferred_console();
1180
1181 apply_alternative_instructions();
1182 if (IS_ENABLED(CONFIG_EXPOLINE))
1183 nospec_init_branches();
1184
1185 /* Setup zfcpdump support */
1186 setup_zfcpdump();
1187
1188 /* Add system specific data to the random pool */
1189 setup_randomness();
1190 }
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