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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-map-ops.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52#include <linux/hugetlb.h>
53#include <linux/kmemleak.h>
54
55#include <asm/archrandom.h>
56#include <asm/boot_data.h>
57#include <asm/ipl.h>
58#include <asm/facility.h>
59#include <asm/smp.h>
60#include <asm/mmu_context.h>
61#include <asm/cpcmd.h>
62#include <asm/abs_lowcore.h>
63#include <asm/nmi.h>
64#include <asm/irq.h>
65#include <asm/page.h>
66#include <asm/ptrace.h>
67#include <asm/sections.h>
68#include <asm/ebcdic.h>
69#include <asm/diag.h>
70#include <asm/os_info.h>
71#include <asm/sclp.h>
72#include <asm/stacktrace.h>
73#include <asm/sysinfo.h>
74#include <asm/numa.h>
75#include <asm/alternative.h>
76#include <asm/nospec-branch.h>
77#include <asm/physmem_info.h>
78#include <asm/maccess.h>
79#include <asm/uv.h>
80#include <asm/asm-offsets.h>
81#include "entry.h"
82
83/*
84 * Machine setup..
85 */
86unsigned int console_mode = 0;
87EXPORT_SYMBOL(console_mode);
88
89unsigned int console_devno = -1;
90EXPORT_SYMBOL(console_devno);
91
92unsigned int console_irq = -1;
93EXPORT_SYMBOL(console_irq);
94
95/*
96 * Some code and data needs to stay below 2 GB, even when the kernel would be
97 * relocated above 2 GB, because it has to use 31 bit addresses.
98 * Such code and data is part of the .amode31 section.
99 */
100char __amode31_ref *__samode31 = _samode31;
101char __amode31_ref *__eamode31 = _eamode31;
102char __amode31_ref *__stext_amode31 = _stext_amode31;
103char __amode31_ref *__etext_amode31 = _etext_amode31;
104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
106
107/*
108 * Control registers CR2, CR5 and CR15 are initialized with addresses
109 * of tables that must be placed below 2G which is handled by the AMODE31
110 * sections.
111 * Because the AMODE31 sections are relocated below 2G at startup,
112 * the content of control registers CR2, CR5 and CR15 must be updated
113 * with new addresses after the relocation. The initial initialization of
114 * control registers occurs in head64.S and then gets updated again after AMODE31
115 * relocation. We must access the relevant AMODE31 tables indirectly via
116 * pointers placed in the .amode31.refs linker section. Those pointers get
117 * updated automatically during AMODE31 relocation and always contain a valid
118 * address within AMODE31 sections.
119 */
120
121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125};
126
127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
128 0x80000000, 0, 0, 0,
129 0x80000000, 0, 0, 0,
130 0x80000000, 0, 0, 0,
131 0x80000000, 0, 0, 0,
132 0x80000000, 0, 0, 0,
133 0x80000000, 0, 0, 0,
134 0x80000000, 0, 0, 0,
135 0x80000000, 0, 0, 0
136};
137
138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141};
142
143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148unsigned long __bootdata_preserved(max_mappable);
149unsigned long __bootdata(ident_map_size);
150struct physmem_info __bootdata(physmem_info);
151
152unsigned long __bootdata_preserved(__kaslr_offset);
153int __bootdata_preserved(__kaslr_enabled);
154unsigned int __bootdata_preserved(zlib_dfltcc_support);
155EXPORT_SYMBOL(zlib_dfltcc_support);
156u64 __bootdata_preserved(stfle_fac_list[16]);
157EXPORT_SYMBOL(stfle_fac_list);
158u64 __bootdata_preserved(alt_stfle_fac_list[16]);
159struct oldmem_data __bootdata_preserved(oldmem_data);
160
161unsigned long VMALLOC_START;
162EXPORT_SYMBOL(VMALLOC_START);
163
164unsigned long VMALLOC_END;
165EXPORT_SYMBOL(VMALLOC_END);
166
167struct page *vmemmap;
168EXPORT_SYMBOL(vmemmap);
169unsigned long vmemmap_size;
170
171unsigned long MODULES_VADDR;
172unsigned long MODULES_END;
173
174/* An array with a pointer to the lowcore of every CPU. */
175struct lowcore *lowcore_ptr[NR_CPUS];
176EXPORT_SYMBOL(lowcore_ptr);
177
178DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
179
180/*
181 * The Write Back bit position in the physaddr is given by the SLPC PCI.
182 * Leaving the mask zero always uses write through which is safe
183 */
184unsigned long mio_wb_bit_mask __ro_after_init;
185
186/*
187 * This is set up by the setup-routine at boot-time
188 * for S390 need to find out, what we have to setup
189 * using address 0x10400 ...
190 */
191
192#include <asm/setup.h>
193
194/*
195 * condev= and conmode= setup parameter.
196 */
197
198static int __init condev_setup(char *str)
199{
200 int vdev;
201
202 vdev = simple_strtoul(str, &str, 0);
203 if (vdev >= 0 && vdev < 65536) {
204 console_devno = vdev;
205 console_irq = -1;
206 }
207 return 1;
208}
209
210__setup("condev=", condev_setup);
211
212static void __init set_preferred_console(void)
213{
214 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
215 add_preferred_console("ttyS", 0, NULL);
216 else if (CONSOLE_IS_3270)
217 add_preferred_console("tty3270", 0, NULL);
218 else if (CONSOLE_IS_VT220)
219 add_preferred_console("ttysclp", 0, NULL);
220 else if (CONSOLE_IS_HVC)
221 add_preferred_console("hvc", 0, NULL);
222}
223
224static int __init conmode_setup(char *str)
225{
226#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
227 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
228 SET_CONSOLE_SCLP;
229#endif
230#if defined(CONFIG_TN3215_CONSOLE)
231 if (!strcmp(str, "3215"))
232 SET_CONSOLE_3215;
233#endif
234#if defined(CONFIG_TN3270_CONSOLE)
235 if (!strcmp(str, "3270"))
236 SET_CONSOLE_3270;
237#endif
238 set_preferred_console();
239 return 1;
240}
241
242__setup("conmode=", conmode_setup);
243
244static void __init conmode_default(void)
245{
246 char query_buffer[1024];
247 char *ptr;
248
249 if (MACHINE_IS_VM) {
250 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
251 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
252 ptr = strstr(query_buffer, "SUBCHANNEL =");
253 console_irq = simple_strtoul(ptr + 13, NULL, 16);
254 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
255 ptr = strstr(query_buffer, "CONMODE");
256 /*
257 * Set the conmode to 3215 so that the device recognition
258 * will set the cu_type of the console to 3215. If the
259 * conmode is 3270 and we don't set it back then both
260 * 3215 and the 3270 driver will try to access the console
261 * device (3215 as console and 3270 as normal tty).
262 */
263 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
264 if (ptr == NULL) {
265#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
266 SET_CONSOLE_SCLP;
267#endif
268 return;
269 }
270 if (str_has_prefix(ptr + 8, "3270")) {
271#if defined(CONFIG_TN3270_CONSOLE)
272 SET_CONSOLE_3270;
273#elif defined(CONFIG_TN3215_CONSOLE)
274 SET_CONSOLE_3215;
275#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
276 SET_CONSOLE_SCLP;
277#endif
278 } else if (str_has_prefix(ptr + 8, "3215")) {
279#if defined(CONFIG_TN3215_CONSOLE)
280 SET_CONSOLE_3215;
281#elif defined(CONFIG_TN3270_CONSOLE)
282 SET_CONSOLE_3270;
283#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
284 SET_CONSOLE_SCLP;
285#endif
286 }
287 } else if (MACHINE_IS_KVM) {
288 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
289 SET_CONSOLE_VT220;
290 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
291 SET_CONSOLE_SCLP;
292 else
293 SET_CONSOLE_HVC;
294 } else {
295#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
296 SET_CONSOLE_SCLP;
297#endif
298 }
299}
300
301#ifdef CONFIG_CRASH_DUMP
302static void __init setup_zfcpdump(void)
303{
304 if (!is_ipl_type_dump())
305 return;
306 if (oldmem_data.start)
307 return;
308 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
309 console_loglevel = 2;
310}
311#else
312static inline void setup_zfcpdump(void) {}
313#endif /* CONFIG_CRASH_DUMP */
314
315 /*
316 * Reboot, halt and power_off stubs. They just call _machine_restart,
317 * _machine_halt or _machine_power_off.
318 */
319
320void machine_restart(char *command)
321{
322 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
323 /*
324 * Only unblank the console if we are called in enabled
325 * context or a bust_spinlocks cleared the way for us.
326 */
327 console_unblank();
328 _machine_restart(command);
329}
330
331void machine_halt(void)
332{
333 if (!in_interrupt() || oops_in_progress)
334 /*
335 * Only unblank the console if we are called in enabled
336 * context or a bust_spinlocks cleared the way for us.
337 */
338 console_unblank();
339 _machine_halt();
340}
341
342void machine_power_off(void)
343{
344 if (!in_interrupt() || oops_in_progress)
345 /*
346 * Only unblank the console if we are called in enabled
347 * context or a bust_spinlocks cleared the way for us.
348 */
349 console_unblank();
350 _machine_power_off();
351}
352
353/*
354 * Dummy power off function.
355 */
356void (*pm_power_off)(void) = machine_power_off;
357EXPORT_SYMBOL_GPL(pm_power_off);
358
359void *restart_stack;
360
361unsigned long stack_alloc(void)
362{
363#ifdef CONFIG_VMAP_STACK
364 void *ret;
365
366 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
367 NUMA_NO_NODE, __builtin_return_address(0));
368 kmemleak_not_leak(ret);
369 return (unsigned long)ret;
370#else
371 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
372#endif
373}
374
375void stack_free(unsigned long stack)
376{
377#ifdef CONFIG_VMAP_STACK
378 vfree((void *) stack);
379#else
380 free_pages(stack, THREAD_SIZE_ORDER);
381#endif
382}
383
384static unsigned long __init stack_alloc_early(void)
385{
386 unsigned long stack;
387
388 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
389 if (!stack) {
390 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
391 __func__, THREAD_SIZE, THREAD_SIZE);
392 }
393 return stack;
394}
395
396static void __init setup_lowcore(void)
397{
398 struct lowcore *lc, *abs_lc;
399
400 /*
401 * Setup lowcore for boot cpu
402 */
403 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
404 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
405 if (!lc)
406 panic("%s: Failed to allocate %zu bytes align=%zx\n",
407 __func__, sizeof(*lc), sizeof(*lc));
408
409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
410 lc->restart_psw.addr = __pa(restart_int_handler);
411 lc->external_new_psw.mask = PSW_KERNEL_BITS;
412 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
413 lc->svc_new_psw.mask = PSW_KERNEL_BITS;
414 lc->svc_new_psw.addr = (unsigned long) system_call;
415 lc->program_new_psw.mask = PSW_KERNEL_BITS;
416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
419 lc->io_new_psw.mask = PSW_KERNEL_BITS;
420 lc->io_new_psw.addr = (unsigned long) io_int_handler;
421 lc->clock_comparator = clock_comparator_max;
422 lc->current_task = (unsigned long)&init_task;
423 lc->lpp = LPP_MAGIC;
424 lc->machine_flags = S390_lowcore.machine_flags;
425 lc->preempt_count = S390_lowcore.preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
428 lc->exit_timer = S390_lowcore.exit_timer;
429 lc->user_timer = S390_lowcore.user_timer;
430 lc->system_timer = S390_lowcore.system_timer;
431 lc->steal_timer = S390_lowcore.steal_timer;
432 lc->last_update_timer = S390_lowcore.last_update_timer;
433 lc->last_update_clock = S390_lowcore.last_update_clock;
434 /*
435 * Allocate the global restart stack which is the same for
436 * all CPUs in case *one* of them does a PSW restart.
437 */
438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
442 lc->kernel_stack = S390_lowcore.kernel_stack;
443 /*
444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
445 * restart data to the absolute zero lowcore. This is necessary if
446 * PSW restart is done on an offline CPU that has lowcore zero.
447 */
448 lc->restart_stack = (unsigned long) restart_stack;
449 lc->restart_fn = (unsigned long) do_restart;
450 lc->restart_data = 0;
451 lc->restart_source = -1U;
452 lc->spinlock_lockval = arch_spin_lockval(0);
453 lc->spinlock_index = 0;
454 arch_spin_lock_setup(0);
455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
457 lc->preempt_count = PREEMPT_DISABLED;
458 lc->kernel_asce = S390_lowcore.kernel_asce;
459 lc->user_asce = S390_lowcore.user_asce;
460
461 system_ctlreg_init_save_area(lc);
462 abs_lc = get_abs_lowcore();
463 abs_lc->restart_stack = lc->restart_stack;
464 abs_lc->restart_fn = lc->restart_fn;
465 abs_lc->restart_data = lc->restart_data;
466 abs_lc->restart_source = lc->restart_source;
467 abs_lc->restart_psw = lc->restart_psw;
468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
469 abs_lc->program_new_psw = lc->program_new_psw;
470 abs_lc->mcesad = lc->mcesad;
471 put_abs_lowcore(abs_lc);
472
473 set_prefix(__pa(lc));
474 lowcore_ptr[0] = lc;
475 if (abs_lowcore_map(0, lowcore_ptr[0], false))
476 panic("Couldn't setup absolute lowcore");
477}
478
479static struct resource code_resource = {
480 .name = "Kernel code",
481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
482};
483
484static struct resource data_resource = {
485 .name = "Kernel data",
486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
487};
488
489static struct resource bss_resource = {
490 .name = "Kernel bss",
491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
492};
493
494static struct resource __initdata *standard_resources[] = {
495 &code_resource,
496 &data_resource,
497 &bss_resource,
498};
499
500static void __init setup_resources(void)
501{
502 struct resource *res, *std_res, *sub_res;
503 phys_addr_t start, end;
504 int j;
505 u64 i;
506
507 code_resource.start = (unsigned long) _text;
508 code_resource.end = (unsigned long) _etext - 1;
509 data_resource.start = (unsigned long) _etext;
510 data_resource.end = (unsigned long) _edata - 1;
511 bss_resource.start = (unsigned long) __bss_start;
512 bss_resource.end = (unsigned long) __bss_stop - 1;
513
514 for_each_mem_range(i, &start, &end) {
515 res = memblock_alloc(sizeof(*res), 8);
516 if (!res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*res), 8);
519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
520
521 res->name = "System RAM";
522 res->start = start;
523 /*
524 * In memblock, end points to the first byte after the
525 * range while in resources, end points to the last byte in
526 * the range.
527 */
528 res->end = end - 1;
529 request_resource(&iomem_resource, res);
530
531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
532 std_res = standard_resources[j];
533 if (std_res->start < res->start ||
534 std_res->start > res->end)
535 continue;
536 if (std_res->end > res->end) {
537 sub_res = memblock_alloc(sizeof(*sub_res), 8);
538 if (!sub_res)
539 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
540 __func__, sizeof(*sub_res), 8);
541 *sub_res = *std_res;
542 sub_res->end = res->end;
543 std_res->start = res->end + 1;
544 request_resource(res, sub_res);
545 } else {
546 request_resource(res, std_res);
547 }
548 }
549 }
550#ifdef CONFIG_CRASH_DUMP
551 /*
552 * Re-add removed crash kernel memory as reserved memory. This makes
553 * sure it will be mapped with the identity mapping and struct pages
554 * will be created, so it can be resized later on.
555 * However add it later since the crash kernel resource should not be
556 * part of the System RAM resource.
557 */
558 if (crashk_res.end) {
559 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
560 0, MEMBLOCK_NONE);
561 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
562 insert_resource(&iomem_resource, &crashk_res);
563 }
564#endif
565}
566
567static void __init setup_memory_end(void)
568{
569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
571}
572
573#ifdef CONFIG_CRASH_DUMP
574
575/*
576 * When kdump is enabled, we have to ensure that no memory from the area
577 * [0 - crashkernel memory size] is set offline - it will be exchanged with
578 * the crashkernel memory region when kdump is triggered. The crashkernel
579 * memory region can never get offlined (pages are unmovable).
580 */
581static int kdump_mem_notifier(struct notifier_block *nb,
582 unsigned long action, void *data)
583{
584 struct memory_notify *arg = data;
585
586 if (action != MEM_GOING_OFFLINE)
587 return NOTIFY_OK;
588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
589 return NOTIFY_BAD;
590 return NOTIFY_OK;
591}
592
593static struct notifier_block kdump_mem_nb = {
594 .notifier_call = kdump_mem_notifier,
595};
596
597#endif
598
599/*
600 * Reserve page tables created by decompressor
601 */
602static void __init reserve_pgtables(void)
603{
604 unsigned long start, end;
605 struct reserved_range *range;
606
607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
608 memblock_reserve(start, end - start);
609}
610
611/*
612 * Reserve memory for kdump kernel to be loaded with kexec
613 */
614static void __init reserve_crashkernel(void)
615{
616#ifdef CONFIG_CRASH_DUMP
617 unsigned long long crash_base, crash_size;
618 phys_addr_t low, high;
619 int rc;
620
621 rc = parse_crashkernel(boot_command_line, ident_map_size,
622 &crash_size, &crash_base, NULL, NULL);
623
624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
626 if (rc || crash_size == 0)
627 return;
628
629 if (memblock.memory.regions[0].size < crash_size) {
630 pr_info("crashkernel reservation failed: %s\n",
631 "first memory chunk must be at least crashkernel size");
632 return;
633 }
634
635 low = crash_base ?: oldmem_data.start;
636 high = low + crash_size;
637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
639 crash_base = low;
640 } else {
641 /* Find suitable area in free memory */
642 low = max_t(unsigned long, crash_size, sclp.hsa_size);
643 high = crash_base ? crash_base + crash_size : ULONG_MAX;
644
645 if (crash_base && crash_base < low) {
646 pr_info("crashkernel reservation failed: %s\n",
647 "crash_base too low");
648 return;
649 }
650 low = crash_base ?: low;
651 crash_base = memblock_phys_alloc_range(crash_size,
652 KEXEC_CRASH_MEM_ALIGN,
653 low, high);
654 }
655
656 if (!crash_base) {
657 pr_info("crashkernel reservation failed: %s\n",
658 "no suitable area found");
659 return;
660 }
661
662 if (register_memory_notifier(&kdump_mem_nb)) {
663 memblock_phys_free(crash_base, crash_size);
664 return;
665 }
666
667 if (!oldmem_data.start && MACHINE_IS_VM)
668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
669 crashk_res.start = crash_base;
670 crashk_res.end = crash_base + crash_size - 1;
671 memblock_remove(crash_base, crash_size);
672 pr_info("Reserving %lluMB of memory at %lluMB "
673 "for crashkernel (System RAM: %luMB)\n",
674 crash_size >> 20, crash_base >> 20,
675 (unsigned long)memblock.memory.total_size >> 20);
676 os_info_crashkernel_add(crash_base, crash_size);
677#endif
678}
679
680/*
681 * Reserve the initrd from being used by memblock
682 */
683static void __init reserve_initrd(void)
684{
685 unsigned long addr, size;
686
687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
688 return;
689 initrd_start = (unsigned long)__va(addr);
690 initrd_end = initrd_start + size;
691 memblock_reserve(addr, size);
692}
693
694/*
695 * Reserve the memory area used to pass the certificate lists
696 */
697static void __init reserve_certificate_list(void)
698{
699 if (ipl_cert_list_addr)
700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
701}
702
703static void __init reserve_physmem_info(void)
704{
705 unsigned long addr, size;
706
707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
708 memblock_reserve(addr, size);
709}
710
711static void __init free_physmem_info(void)
712{
713 unsigned long addr, size;
714
715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
716 memblock_phys_free(addr, size);
717}
718
719static void __init memblock_add_physmem_info(void)
720{
721 unsigned long start, end;
722 int i;
723
724 pr_debug("physmem info source: %s (%hhd)\n",
725 get_physmem_info_source(), physmem_info.info_source);
726 /* keep memblock lists close to the kernel */
727 memblock_set_bottom_up(true);
728 for_each_physmem_usable_range(i, &start, &end)
729 memblock_add(start, end - start);
730 for_each_physmem_online_range(i, &start, &end)
731 memblock_physmem_add(start, end - start);
732 memblock_set_bottom_up(false);
733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
734}
735
736/*
737 * Reserve memory used for lowcore/command line/kernel image.
738 */
739static void __init reserve_kernel(void)
740{
741 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
742 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
743 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
744 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
745 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
746 memblock_reserve(__pa(_stext), _end - _stext);
747}
748
749static void __init setup_memory(void)
750{
751 phys_addr_t start, end;
752 u64 i;
753
754 /*
755 * Init storage key for present memory
756 */
757 for_each_mem_range(i, &start, &end)
758 storage_key_init_range(start, end);
759
760 psw_set_key(PAGE_DEFAULT_KEY);
761}
762
763static void __init relocate_amode31_section(void)
764{
765 unsigned long amode31_size = __eamode31 - __samode31;
766 long amode31_offset, *ptr;
767
768 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31;
769 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
770
771 /* Move original AMODE31 section to the new one */
772 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
773 /* Zero out the old AMODE31 section to catch invalid accesses within it */
774 memset(__samode31, 0, amode31_size);
775
776 /* Update all AMODE31 region references */
777 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
778 *ptr += amode31_offset;
779}
780
781/* This must be called after AMODE31 relocation */
782static void __init setup_cr(void)
783{
784 union ctlreg2 cr2;
785 union ctlreg5 cr5;
786 union ctlreg15 cr15;
787
788 __ctl_duct[1] = (unsigned long)__ctl_aste;
789 __ctl_duct[2] = (unsigned long)__ctl_aste;
790 __ctl_duct[4] = (unsigned long)__ctl_duald;
791
792 /* Update control registers CR2, CR5 and CR15 */
793 local_ctl_store(2, &cr2.reg);
794 local_ctl_store(5, &cr5.reg);
795 local_ctl_store(15, &cr15.reg);
796 cr2.ducto = (unsigned long)__ctl_duct >> 6;
797 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
798 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
799 system_ctl_load(2, &cr2.reg);
800 system_ctl_load(5, &cr5.reg);
801 system_ctl_load(15, &cr15.reg);
802}
803
804/*
805 * Add system information as device randomness
806 */
807static void __init setup_randomness(void)
808{
809 struct sysinfo_3_2_2 *vmms;
810
811 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
812 if (!vmms)
813 panic("Failed to allocate memory for sysinfo structure\n");
814 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
815 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
816 memblock_free(vmms, PAGE_SIZE);
817
818 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
819 static_branch_enable(&s390_arch_random_available);
820}
821
822/*
823 * Issue diagnose 318 to set the control program name and
824 * version codes.
825 */
826static void __init setup_control_program_code(void)
827{
828 union diag318_info diag318_info = {
829 .cpnc = CPNC_LINUX,
830 .cpvc = 0,
831 };
832
833 if (!sclp.has_diag318)
834 return;
835
836 diag_stat_inc(DIAG_STAT_X318);
837 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
838}
839
840/*
841 * Print the component list from the IPL report
842 */
843static void __init log_component_list(void)
844{
845 struct ipl_rb_component_entry *ptr, *end;
846 char *str;
847
848 if (!early_ipl_comp_list_addr)
849 return;
850 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
851 pr_info("Linux is running with Secure-IPL enabled\n");
852 else
853 pr_info("Linux is running with Secure-IPL disabled\n");
854 ptr = __va(early_ipl_comp_list_addr);
855 end = (void *) ptr + early_ipl_comp_list_size;
856 pr_info("The IPL report contains the following components:\n");
857 while (ptr < end) {
858 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
859 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
860 str = "signed, verified";
861 else
862 str = "signed, verification failed";
863 } else {
864 str = "not signed";
865 }
866 pr_info("%016llx - %016llx (%s)\n",
867 ptr->addr, ptr->addr + ptr->len, str);
868 ptr++;
869 }
870}
871
872/*
873 * Setup function called from init/main.c just after the banner
874 * was printed.
875 */
876
877void __init setup_arch(char **cmdline_p)
878{
879 /*
880 * print what head.S has found out about the machine
881 */
882 if (MACHINE_IS_VM)
883 pr_info("Linux is running as a z/VM "
884 "guest operating system in 64-bit mode\n");
885 else if (MACHINE_IS_KVM)
886 pr_info("Linux is running under KVM in 64-bit mode\n");
887 else if (MACHINE_IS_LPAR)
888 pr_info("Linux is running natively in 64-bit mode\n");
889 else
890 pr_info("Linux is running as a guest in 64-bit mode\n");
891
892 log_component_list();
893
894 /* Have one command line that is parsed and saved in /proc/cmdline */
895 /* boot_command_line has been already set up in early.c */
896 *cmdline_p = boot_command_line;
897
898 ROOT_DEV = Root_RAM0;
899
900 setup_initial_init_mm(_text, _etext, _edata, _end);
901
902 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
903 nospec_auto_detect();
904
905 jump_label_init();
906 parse_early_param();
907#ifdef CONFIG_CRASH_DUMP
908 /* Deactivate elfcorehdr= kernel parameter */
909 elfcorehdr_addr = ELFCORE_ADDR_MAX;
910#endif
911
912 os_info_init();
913 setup_ipl();
914 setup_control_program_code();
915
916 /* Do some memory reservations *before* memory is added to memblock */
917 reserve_pgtables();
918 reserve_kernel();
919 reserve_initrd();
920 reserve_certificate_list();
921 reserve_physmem_info();
922 memblock_set_current_limit(ident_map_size);
923 memblock_allow_resize();
924
925 /* Get information about *all* installed memory */
926 memblock_add_physmem_info();
927
928 free_physmem_info();
929 setup_memory_end();
930 memblock_dump_all();
931 setup_memory();
932
933 relocate_amode31_section();
934 setup_cr();
935 setup_uv();
936 dma_contiguous_reserve(ident_map_size);
937 vmcp_cma_reserve();
938 if (MACHINE_HAS_EDAT2)
939 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
940
941 reserve_crashkernel();
942#ifdef CONFIG_CRASH_DUMP
943 /*
944 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
945 * Therefore CPU and device initialization should be done afterwards.
946 */
947 smp_save_dump_secondary_cpus();
948#endif
949
950 setup_resources();
951 setup_lowcore();
952 smp_fill_possible_mask();
953 cpu_detect_mhz_feature();
954 cpu_init();
955 numa_setup();
956 smp_detect_cpus();
957 topology_init_early();
958
959 if (test_facility(193))
960 static_branch_enable(&cpu_has_bear);
961
962 /*
963 * Create kernel page tables.
964 */
965 paging_init();
966
967 /*
968 * After paging_init created the kernel page table, the new PSWs
969 * in lowcore can now run with DAT enabled.
970 */
971#ifdef CONFIG_CRASH_DUMP
972 smp_save_dump_ipl_cpu();
973#endif
974
975 /* Setup default console */
976 conmode_default();
977 set_preferred_console();
978
979 apply_alternative_instructions();
980 if (IS_ENABLED(CONFIG_EXPOLINE))
981 nospec_init_branches();
982
983 /* Setup zfcp/nvme dump support */
984 setup_zfcpdump();
985
986 /* Add system specific data to the random pool */
987 setup_randomness();
988}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-map-ops.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52#include <linux/hugetlb.h>
53#include <linux/kmemleak.h>
54
55#include <asm/boot_data.h>
56#include <asm/ipl.h>
57#include <asm/facility.h>
58#include <asm/smp.h>
59#include <asm/mmu_context.h>
60#include <asm/cpcmd.h>
61#include <asm/lowcore.h>
62#include <asm/nmi.h>
63#include <asm/irq.h>
64#include <asm/page.h>
65#include <asm/ptrace.h>
66#include <asm/sections.h>
67#include <asm/ebcdic.h>
68#include <asm/diag.h>
69#include <asm/os_info.h>
70#include <asm/sclp.h>
71#include <asm/stacktrace.h>
72#include <asm/sysinfo.h>
73#include <asm/numa.h>
74#include <asm/alternative.h>
75#include <asm/nospec-branch.h>
76#include <asm/mem_detect.h>
77#include <asm/uv.h>
78#include <asm/asm-offsets.h>
79#include "entry.h"
80
81/*
82 * Machine setup..
83 */
84unsigned int console_mode = 0;
85EXPORT_SYMBOL(console_mode);
86
87unsigned int console_devno = -1;
88EXPORT_SYMBOL(console_devno);
89
90unsigned int console_irq = -1;
91EXPORT_SYMBOL(console_irq);
92
93unsigned long elf_hwcap __read_mostly = 0;
94char elf_platform[ELF_PLATFORM_SIZE];
95
96unsigned long int_hwcap = 0;
97
98int __bootdata(noexec_disabled);
99unsigned long __bootdata(ident_map_size);
100struct mem_detect_info __bootdata(mem_detect);
101
102struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
103struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
104unsigned long __bootdata_preserved(__stext_dma);
105unsigned long __bootdata_preserved(__etext_dma);
106unsigned long __bootdata_preserved(__sdma);
107unsigned long __bootdata_preserved(__edma);
108unsigned long __bootdata_preserved(__kaslr_offset);
109unsigned int __bootdata_preserved(zlib_dfltcc_support);
110EXPORT_SYMBOL(zlib_dfltcc_support);
111u64 __bootdata_preserved(stfle_fac_list[16]);
112EXPORT_SYMBOL(stfle_fac_list);
113u64 __bootdata_preserved(alt_stfle_fac_list[16]);
114
115unsigned long VMALLOC_START;
116EXPORT_SYMBOL(VMALLOC_START);
117
118unsigned long VMALLOC_END;
119EXPORT_SYMBOL(VMALLOC_END);
120
121struct page *vmemmap;
122EXPORT_SYMBOL(vmemmap);
123unsigned long vmemmap_size;
124
125unsigned long MODULES_VADDR;
126unsigned long MODULES_END;
127
128/* An array with a pointer to the lowcore of every CPU. */
129struct lowcore *lowcore_ptr[NR_CPUS];
130EXPORT_SYMBOL(lowcore_ptr);
131
132/*
133 * The Write Back bit position in the physaddr is given by the SLPC PCI.
134 * Leaving the mask zero always uses write through which is safe
135 */
136unsigned long mio_wb_bit_mask __ro_after_init;
137
138/*
139 * This is set up by the setup-routine at boot-time
140 * for S390 need to find out, what we have to setup
141 * using address 0x10400 ...
142 */
143
144#include <asm/setup.h>
145
146/*
147 * condev= and conmode= setup parameter.
148 */
149
150static int __init condev_setup(char *str)
151{
152 int vdev;
153
154 vdev = simple_strtoul(str, &str, 0);
155 if (vdev >= 0 && vdev < 65536) {
156 console_devno = vdev;
157 console_irq = -1;
158 }
159 return 1;
160}
161
162__setup("condev=", condev_setup);
163
164static void __init set_preferred_console(void)
165{
166 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
167 add_preferred_console("ttyS", 0, NULL);
168 else if (CONSOLE_IS_3270)
169 add_preferred_console("tty3270", 0, NULL);
170 else if (CONSOLE_IS_VT220)
171 add_preferred_console("ttysclp", 0, NULL);
172 else if (CONSOLE_IS_HVC)
173 add_preferred_console("hvc", 0, NULL);
174}
175
176static int __init conmode_setup(char *str)
177{
178#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
179 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
180 SET_CONSOLE_SCLP;
181#endif
182#if defined(CONFIG_TN3215_CONSOLE)
183 if (!strcmp(str, "3215"))
184 SET_CONSOLE_3215;
185#endif
186#if defined(CONFIG_TN3270_CONSOLE)
187 if (!strcmp(str, "3270"))
188 SET_CONSOLE_3270;
189#endif
190 set_preferred_console();
191 return 1;
192}
193
194__setup("conmode=", conmode_setup);
195
196static void __init conmode_default(void)
197{
198 char query_buffer[1024];
199 char *ptr;
200
201 if (MACHINE_IS_VM) {
202 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
203 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
204 ptr = strstr(query_buffer, "SUBCHANNEL =");
205 console_irq = simple_strtoul(ptr + 13, NULL, 16);
206 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
207 ptr = strstr(query_buffer, "CONMODE");
208 /*
209 * Set the conmode to 3215 so that the device recognition
210 * will set the cu_type of the console to 3215. If the
211 * conmode is 3270 and we don't set it back then both
212 * 3215 and the 3270 driver will try to access the console
213 * device (3215 as console and 3270 as normal tty).
214 */
215 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
216 if (ptr == NULL) {
217#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
218 SET_CONSOLE_SCLP;
219#endif
220 return;
221 }
222 if (str_has_prefix(ptr + 8, "3270")) {
223#if defined(CONFIG_TN3270_CONSOLE)
224 SET_CONSOLE_3270;
225#elif defined(CONFIG_TN3215_CONSOLE)
226 SET_CONSOLE_3215;
227#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 } else if (str_has_prefix(ptr + 8, "3215")) {
231#if defined(CONFIG_TN3215_CONSOLE)
232 SET_CONSOLE_3215;
233#elif defined(CONFIG_TN3270_CONSOLE)
234 SET_CONSOLE_3270;
235#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
236 SET_CONSOLE_SCLP;
237#endif
238 }
239 } else if (MACHINE_IS_KVM) {
240 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
241 SET_CONSOLE_VT220;
242 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
243 SET_CONSOLE_SCLP;
244 else
245 SET_CONSOLE_HVC;
246 } else {
247#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
248 SET_CONSOLE_SCLP;
249#endif
250 }
251}
252
253#ifdef CONFIG_CRASH_DUMP
254static void __init setup_zfcpdump(void)
255{
256 if (!is_ipl_type_dump())
257 return;
258 if (OLDMEM_BASE)
259 return;
260 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
261 console_loglevel = 2;
262}
263#else
264static inline void setup_zfcpdump(void) {}
265#endif /* CONFIG_CRASH_DUMP */
266
267 /*
268 * Reboot, halt and power_off stubs. They just call _machine_restart,
269 * _machine_halt or _machine_power_off.
270 */
271
272void machine_restart(char *command)
273{
274 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
275 /*
276 * Only unblank the console if we are called in enabled
277 * context or a bust_spinlocks cleared the way for us.
278 */
279 console_unblank();
280 _machine_restart(command);
281}
282
283void machine_halt(void)
284{
285 if (!in_interrupt() || oops_in_progress)
286 /*
287 * Only unblank the console if we are called in enabled
288 * context or a bust_spinlocks cleared the way for us.
289 */
290 console_unblank();
291 _machine_halt();
292}
293
294void machine_power_off(void)
295{
296 if (!in_interrupt() || oops_in_progress)
297 /*
298 * Only unblank the console if we are called in enabled
299 * context or a bust_spinlocks cleared the way for us.
300 */
301 console_unblank();
302 _machine_power_off();
303}
304
305/*
306 * Dummy power off function.
307 */
308void (*pm_power_off)(void) = machine_power_off;
309EXPORT_SYMBOL_GPL(pm_power_off);
310
311void *restart_stack;
312
313unsigned long stack_alloc(void)
314{
315#ifdef CONFIG_VMAP_STACK
316 void *ret;
317
318 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
319 NUMA_NO_NODE, __builtin_return_address(0));
320 kmemleak_not_leak(ret);
321 return (unsigned long)ret;
322#else
323 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
324#endif
325}
326
327void stack_free(unsigned long stack)
328{
329#ifdef CONFIG_VMAP_STACK
330 vfree((void *) stack);
331#else
332 free_pages(stack, THREAD_SIZE_ORDER);
333#endif
334}
335
336int __init arch_early_irq_init(void)
337{
338 unsigned long stack;
339
340 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
341 if (!stack)
342 panic("Couldn't allocate async stack");
343 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
344 return 0;
345}
346
347void __init arch_call_rest_init(void)
348{
349 unsigned long stack;
350
351 stack = stack_alloc();
352 if (!stack)
353 panic("Couldn't allocate kernel stack");
354 current->stack = (void *) stack;
355#ifdef CONFIG_VMAP_STACK
356 current->stack_vm_area = (void *) stack;
357#endif
358 set_task_stack_end_magic(current);
359 stack += STACK_INIT_OFFSET;
360 S390_lowcore.kernel_stack = stack;
361 call_on_stack_noreturn(rest_init, stack);
362}
363
364static void __init setup_lowcore_dat_off(void)
365{
366 unsigned long int_psw_mask = PSW_KERNEL_BITS;
367 unsigned long mcck_stack;
368 struct lowcore *lc;
369
370 if (IS_ENABLED(CONFIG_KASAN))
371 int_psw_mask |= PSW_MASK_DAT;
372
373 /*
374 * Setup lowcore for boot cpu
375 */
376 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
377 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
378 if (!lc)
379 panic("%s: Failed to allocate %zu bytes align=%zx\n",
380 __func__, sizeof(*lc), sizeof(*lc));
381
382 lc->restart_psw.mask = PSW_KERNEL_BITS;
383 lc->restart_psw.addr = (unsigned long) restart_int_handler;
384 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
385 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
386 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
387 lc->svc_new_psw.addr = (unsigned long) system_call;
388 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
389 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
390 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
391 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
392 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
393 lc->io_new_psw.addr = (unsigned long) io_int_handler;
394 lc->clock_comparator = clock_comparator_max;
395 lc->nodat_stack = ((unsigned long) &init_thread_union)
396 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
397 lc->current_task = (unsigned long)&init_task;
398 lc->lpp = LPP_MAGIC;
399 lc->machine_flags = S390_lowcore.machine_flags;
400 lc->preempt_count = S390_lowcore.preempt_count;
401 nmi_alloc_boot_cpu(lc);
402 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
403 lc->exit_timer = S390_lowcore.exit_timer;
404 lc->user_timer = S390_lowcore.user_timer;
405 lc->system_timer = S390_lowcore.system_timer;
406 lc->steal_timer = S390_lowcore.steal_timer;
407 lc->last_update_timer = S390_lowcore.last_update_timer;
408 lc->last_update_clock = S390_lowcore.last_update_clock;
409
410 /*
411 * Allocate the global restart stack which is the same for
412 * all CPUs in cast *one* of them does a PSW restart.
413 */
414 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
415 if (!restart_stack)
416 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
417 __func__, THREAD_SIZE, THREAD_SIZE);
418 restart_stack += STACK_INIT_OFFSET;
419
420 /*
421 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
422 * restart data to the absolute zero lowcore. This is necessary if
423 * PSW restart is done on an offline CPU that has lowcore zero.
424 */
425 lc->restart_stack = (unsigned long) restart_stack;
426 lc->restart_fn = (unsigned long) do_restart;
427 lc->restart_data = 0;
428 lc->restart_source = -1U;
429
430 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
431 if (!mcck_stack)
432 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
433 __func__, THREAD_SIZE, THREAD_SIZE);
434 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
435
436 /* Setup absolute zero lowcore */
437 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
438 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
439 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
440 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
441 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
442
443 lc->spinlock_lockval = arch_spin_lockval(0);
444 lc->spinlock_index = 0;
445 arch_spin_lock_setup(0);
446 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
447 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
448 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
449 lc->preempt_count = PREEMPT_DISABLED;
450
451 set_prefix((u32)(unsigned long) lc);
452 lowcore_ptr[0] = lc;
453}
454
455static void __init setup_lowcore_dat_on(void)
456{
457 struct lowcore *lc = lowcore_ptr[0];
458
459 __ctl_clear_bit(0, 28);
460 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
461 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
462 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
463 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
464 __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
465 __ctl_set_bit(0, 28);
466 mem_assign_absolute(S390_lowcore.restart_flags, RESTART_FLAG_CTLREGS);
467 mem_assign_absolute(S390_lowcore.program_new_psw, lc->program_new_psw);
468 memcpy_absolute(&S390_lowcore.cregs_save_area, lc->cregs_save_area,
469 sizeof(S390_lowcore.cregs_save_area));
470}
471
472static struct resource code_resource = {
473 .name = "Kernel code",
474 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
475};
476
477static struct resource data_resource = {
478 .name = "Kernel data",
479 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
480};
481
482static struct resource bss_resource = {
483 .name = "Kernel bss",
484 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
485};
486
487static struct resource __initdata *standard_resources[] = {
488 &code_resource,
489 &data_resource,
490 &bss_resource,
491};
492
493static void __init setup_resources(void)
494{
495 struct resource *res, *std_res, *sub_res;
496 phys_addr_t start, end;
497 int j;
498 u64 i;
499
500 code_resource.start = (unsigned long) _text;
501 code_resource.end = (unsigned long) _etext - 1;
502 data_resource.start = (unsigned long) _etext;
503 data_resource.end = (unsigned long) _edata - 1;
504 bss_resource.start = (unsigned long) __bss_start;
505 bss_resource.end = (unsigned long) __bss_stop - 1;
506
507 for_each_mem_range(i, &start, &end) {
508 res = memblock_alloc(sizeof(*res), 8);
509 if (!res)
510 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
511 __func__, sizeof(*res), 8);
512 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
513
514 res->name = "System RAM";
515 res->start = start;
516 /*
517 * In memblock, end points to the first byte after the
518 * range while in resourses, end points to the last byte in
519 * the range.
520 */
521 res->end = end - 1;
522 request_resource(&iomem_resource, res);
523
524 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
525 std_res = standard_resources[j];
526 if (std_res->start < res->start ||
527 std_res->start > res->end)
528 continue;
529 if (std_res->end > res->end) {
530 sub_res = memblock_alloc(sizeof(*sub_res), 8);
531 if (!sub_res)
532 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
533 __func__, sizeof(*sub_res), 8);
534 *sub_res = *std_res;
535 sub_res->end = res->end;
536 std_res->start = res->end + 1;
537 request_resource(res, sub_res);
538 } else {
539 request_resource(res, std_res);
540 }
541 }
542 }
543#ifdef CONFIG_CRASH_DUMP
544 /*
545 * Re-add removed crash kernel memory as reserved memory. This makes
546 * sure it will be mapped with the identity mapping and struct pages
547 * will be created, so it can be resized later on.
548 * However add it later since the crash kernel resource should not be
549 * part of the System RAM resource.
550 */
551 if (crashk_res.end) {
552 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
553 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
554 insert_resource(&iomem_resource, &crashk_res);
555 }
556#endif
557}
558
559static void __init setup_memory_end(void)
560{
561 memblock_remove(ident_map_size, ULONG_MAX);
562 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
563 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
564}
565
566#ifdef CONFIG_CRASH_DUMP
567
568/*
569 * When kdump is enabled, we have to ensure that no memory from the area
570 * [0 - crashkernel memory size] is set offline - it will be exchanged with
571 * the crashkernel memory region when kdump is triggered. The crashkernel
572 * memory region can never get offlined (pages are unmovable).
573 */
574static int kdump_mem_notifier(struct notifier_block *nb,
575 unsigned long action, void *data)
576{
577 struct memory_notify *arg = data;
578
579 if (action != MEM_GOING_OFFLINE)
580 return NOTIFY_OK;
581 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
582 return NOTIFY_BAD;
583 return NOTIFY_OK;
584}
585
586static struct notifier_block kdump_mem_nb = {
587 .notifier_call = kdump_mem_notifier,
588};
589
590#endif
591
592/*
593 * Make sure that the area above identity mapping is protected
594 */
595static void __init reserve_above_ident_map(void)
596{
597 memblock_reserve(ident_map_size, ULONG_MAX);
598}
599
600/*
601 * Reserve memory for kdump kernel to be loaded with kexec
602 */
603static void __init reserve_crashkernel(void)
604{
605#ifdef CONFIG_CRASH_DUMP
606 unsigned long long crash_base, crash_size;
607 phys_addr_t low, high;
608 int rc;
609
610 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
611 &crash_base);
612
613 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
614 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
615 if (rc || crash_size == 0)
616 return;
617
618 if (memblock.memory.regions[0].size < crash_size) {
619 pr_info("crashkernel reservation failed: %s\n",
620 "first memory chunk must be at least crashkernel size");
621 return;
622 }
623
624 low = crash_base ?: OLDMEM_BASE;
625 high = low + crash_size;
626 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
627 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
628 crash_base = low;
629 } else {
630 /* Find suitable area in free memory */
631 low = max_t(unsigned long, crash_size, sclp.hsa_size);
632 high = crash_base ? crash_base + crash_size : ULONG_MAX;
633
634 if (crash_base && crash_base < low) {
635 pr_info("crashkernel reservation failed: %s\n",
636 "crash_base too low");
637 return;
638 }
639 low = crash_base ?: low;
640 crash_base = memblock_find_in_range(low, high, crash_size,
641 KEXEC_CRASH_MEM_ALIGN);
642 }
643
644 if (!crash_base) {
645 pr_info("crashkernel reservation failed: %s\n",
646 "no suitable area found");
647 return;
648 }
649
650 if (register_memory_notifier(&kdump_mem_nb))
651 return;
652
653 if (!OLDMEM_BASE && MACHINE_IS_VM)
654 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
655 crashk_res.start = crash_base;
656 crashk_res.end = crash_base + crash_size - 1;
657 memblock_remove(crash_base, crash_size);
658 pr_info("Reserving %lluMB of memory at %lluMB "
659 "for crashkernel (System RAM: %luMB)\n",
660 crash_size >> 20, crash_base >> 20,
661 (unsigned long)memblock.memory.total_size >> 20);
662 os_info_crashkernel_add(crash_base, crash_size);
663#endif
664}
665
666/*
667 * Reserve the initrd from being used by memblock
668 */
669static void __init reserve_initrd(void)
670{
671#ifdef CONFIG_BLK_DEV_INITRD
672 if (!INITRD_START || !INITRD_SIZE)
673 return;
674 initrd_start = INITRD_START;
675 initrd_end = initrd_start + INITRD_SIZE;
676 memblock_reserve(INITRD_START, INITRD_SIZE);
677#endif
678}
679
680/*
681 * Reserve the memory area used to pass the certificate lists
682 */
683static void __init reserve_certificate_list(void)
684{
685 if (ipl_cert_list_addr)
686 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
687}
688
689static void __init reserve_mem_detect_info(void)
690{
691 unsigned long start, size;
692
693 get_mem_detect_reserved(&start, &size);
694 if (size)
695 memblock_reserve(start, size);
696}
697
698static void __init free_mem_detect_info(void)
699{
700 unsigned long start, size;
701
702 get_mem_detect_reserved(&start, &size);
703 if (size)
704 memblock_free(start, size);
705}
706
707static const char * __init get_mem_info_source(void)
708{
709 switch (mem_detect.info_source) {
710 case MEM_DETECT_SCLP_STOR_INFO:
711 return "sclp storage info";
712 case MEM_DETECT_DIAG260:
713 return "diag260";
714 case MEM_DETECT_SCLP_READ_INFO:
715 return "sclp read info";
716 case MEM_DETECT_BIN_SEARCH:
717 return "binary search";
718 }
719 return "none";
720}
721
722static void __init memblock_add_mem_detect_info(void)
723{
724 unsigned long start, end;
725 int i;
726
727 pr_debug("physmem info source: %s (%hhd)\n",
728 get_mem_info_source(), mem_detect.info_source);
729 /* keep memblock lists close to the kernel */
730 memblock_set_bottom_up(true);
731 for_each_mem_detect_block(i, &start, &end) {
732 memblock_add(start, end - start);
733 memblock_physmem_add(start, end - start);
734 }
735 memblock_set_bottom_up(false);
736 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
737 memblock_dump_all();
738}
739
740/*
741 * Check for initrd being in usable memory
742 */
743static void __init check_initrd(void)
744{
745#ifdef CONFIG_BLK_DEV_INITRD
746 if (INITRD_START && INITRD_SIZE &&
747 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
748 pr_err("The initial RAM disk does not fit into the memory\n");
749 memblock_free(INITRD_START, INITRD_SIZE);
750 initrd_start = initrd_end = 0;
751 }
752#endif
753}
754
755/*
756 * Reserve memory used for lowcore/command line/kernel image.
757 */
758static void __init reserve_kernel(void)
759{
760 unsigned long start_pfn = PFN_UP(__pa(_end));
761
762 memblock_reserve(0, HEAD_END);
763 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
764 - (unsigned long)_stext);
765 memblock_reserve(__sdma, __edma - __sdma);
766}
767
768static void __init setup_memory(void)
769{
770 phys_addr_t start, end;
771 u64 i;
772
773 /*
774 * Init storage key for present memory
775 */
776 for_each_mem_range(i, &start, &end)
777 storage_key_init_range(start, end);
778
779 psw_set_key(PAGE_DEFAULT_KEY);
780
781 /* Only cosmetics */
782 memblock_enforce_memory_limit(memblock_end_of_DRAM());
783}
784
785/*
786 * Setup hardware capabilities.
787 */
788static int __init setup_hwcaps(void)
789{
790 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
791 struct cpuid cpu_id;
792 int i;
793
794 /*
795 * The store facility list bits numbers as found in the principles
796 * of operation are numbered with bit 1UL<<31 as number 0 to
797 * bit 1UL<<0 as number 31.
798 * Bit 0: instructions named N3, "backported" to esa-mode
799 * Bit 2: z/Architecture mode is active
800 * Bit 7: the store-facility-list-extended facility is installed
801 * Bit 17: the message-security assist is installed
802 * Bit 19: the long-displacement facility is installed
803 * Bit 21: the extended-immediate facility is installed
804 * Bit 22: extended-translation facility 3 is installed
805 * Bit 30: extended-translation facility 3 enhancement facility
806 * These get translated to:
807 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
808 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
809 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
810 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
811 */
812 for (i = 0; i < 6; i++)
813 if (test_facility(stfl_bits[i]))
814 elf_hwcap |= 1UL << i;
815
816 if (test_facility(22) && test_facility(30))
817 elf_hwcap |= HWCAP_S390_ETF3EH;
818
819 /*
820 * Check for additional facilities with store-facility-list-extended.
821 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
822 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
823 * as stored by stfl, bits 32-xxx contain additional facilities.
824 * How many facility words are stored depends on the number of
825 * doublewords passed to the instruction. The additional facilities
826 * are:
827 * Bit 42: decimal floating point facility is installed
828 * Bit 44: perform floating point operation facility is installed
829 * translated to:
830 * HWCAP_S390_DFP bit 6 (42 && 44).
831 */
832 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
833 elf_hwcap |= HWCAP_S390_DFP;
834
835 /*
836 * Huge page support HWCAP_S390_HPAGE is bit 7.
837 */
838 if (MACHINE_HAS_EDAT1)
839 elf_hwcap |= HWCAP_S390_HPAGE;
840
841 /*
842 * 64-bit register support for 31-bit processes
843 * HWCAP_S390_HIGH_GPRS is bit 9.
844 */
845 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
846
847 /*
848 * Transactional execution support HWCAP_S390_TE is bit 10.
849 */
850 if (MACHINE_HAS_TE)
851 elf_hwcap |= HWCAP_S390_TE;
852
853 /*
854 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
855 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
856 * instead of facility bit 129.
857 */
858 if (MACHINE_HAS_VX) {
859 elf_hwcap |= HWCAP_S390_VXRS;
860 if (test_facility(134))
861 elf_hwcap |= HWCAP_S390_VXRS_BCD;
862 if (test_facility(135))
863 elf_hwcap |= HWCAP_S390_VXRS_EXT;
864 if (test_facility(148))
865 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
866 if (test_facility(152))
867 elf_hwcap |= HWCAP_S390_VXRS_PDE;
868 }
869 if (test_facility(150))
870 elf_hwcap |= HWCAP_S390_SORT;
871 if (test_facility(151))
872 elf_hwcap |= HWCAP_S390_DFLT;
873
874 /*
875 * Guarded storage support HWCAP_S390_GS is bit 12.
876 */
877 if (MACHINE_HAS_GS)
878 elf_hwcap |= HWCAP_S390_GS;
879
880 get_cpu_id(&cpu_id);
881 add_device_randomness(&cpu_id, sizeof(cpu_id));
882 switch (cpu_id.machine) {
883 case 0x2064:
884 case 0x2066:
885 default: /* Use "z900" as default for 64 bit kernels. */
886 strcpy(elf_platform, "z900");
887 break;
888 case 0x2084:
889 case 0x2086:
890 strcpy(elf_platform, "z990");
891 break;
892 case 0x2094:
893 case 0x2096:
894 strcpy(elf_platform, "z9-109");
895 break;
896 case 0x2097:
897 case 0x2098:
898 strcpy(elf_platform, "z10");
899 break;
900 case 0x2817:
901 case 0x2818:
902 strcpy(elf_platform, "z196");
903 break;
904 case 0x2827:
905 case 0x2828:
906 strcpy(elf_platform, "zEC12");
907 break;
908 case 0x2964:
909 case 0x2965:
910 strcpy(elf_platform, "z13");
911 break;
912 case 0x3906:
913 case 0x3907:
914 strcpy(elf_platform, "z14");
915 break;
916 case 0x8561:
917 case 0x8562:
918 strcpy(elf_platform, "z15");
919 break;
920 }
921
922 /*
923 * Virtualization support HWCAP_INT_SIE is bit 0.
924 */
925 if (sclp.has_sief2)
926 int_hwcap |= HWCAP_INT_SIE;
927
928 return 0;
929}
930arch_initcall(setup_hwcaps);
931
932/*
933 * Add system information as device randomness
934 */
935static void __init setup_randomness(void)
936{
937 struct sysinfo_3_2_2 *vmms;
938
939 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
940 PAGE_SIZE);
941 if (!vmms)
942 panic("Failed to allocate memory for sysinfo structure\n");
943
944 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
945 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
946 memblock_free((unsigned long) vmms, PAGE_SIZE);
947}
948
949/*
950 * Find the correct size for the task_struct. This depends on
951 * the size of the struct fpu at the end of the thread_struct
952 * which is embedded in the task_struct.
953 */
954static void __init setup_task_size(void)
955{
956 int task_size = sizeof(struct task_struct);
957
958 if (!MACHINE_HAS_VX) {
959 task_size -= sizeof(__vector128) * __NUM_VXRS;
960 task_size += sizeof(freg_t) * __NUM_FPRS;
961 }
962 arch_task_struct_size = task_size;
963}
964
965/*
966 * Issue diagnose 318 to set the control program name and
967 * version codes.
968 */
969static void __init setup_control_program_code(void)
970{
971 union diag318_info diag318_info = {
972 .cpnc = CPNC_LINUX,
973 .cpvc = 0,
974 };
975
976 if (!sclp.has_diag318)
977 return;
978
979 diag_stat_inc(DIAG_STAT_X318);
980 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
981}
982
983/*
984 * Print the component list from the IPL report
985 */
986static void __init log_component_list(void)
987{
988 struct ipl_rb_component_entry *ptr, *end;
989 char *str;
990
991 if (!early_ipl_comp_list_addr)
992 return;
993 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
994 pr_info("Linux is running with Secure-IPL enabled\n");
995 else
996 pr_info("Linux is running with Secure-IPL disabled\n");
997 ptr = (void *) early_ipl_comp_list_addr;
998 end = (void *) ptr + early_ipl_comp_list_size;
999 pr_info("The IPL report contains the following components:\n");
1000 while (ptr < end) {
1001 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1002 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1003 str = "signed, verified";
1004 else
1005 str = "signed, verification failed";
1006 } else {
1007 str = "not signed";
1008 }
1009 pr_info("%016llx - %016llx (%s)\n",
1010 ptr->addr, ptr->addr + ptr->len, str);
1011 ptr++;
1012 }
1013}
1014
1015/*
1016 * Setup function called from init/main.c just after the banner
1017 * was printed.
1018 */
1019
1020void __init setup_arch(char **cmdline_p)
1021{
1022 /*
1023 * print what head.S has found out about the machine
1024 */
1025 if (MACHINE_IS_VM)
1026 pr_info("Linux is running as a z/VM "
1027 "guest operating system in 64-bit mode\n");
1028 else if (MACHINE_IS_KVM)
1029 pr_info("Linux is running under KVM in 64-bit mode\n");
1030 else if (MACHINE_IS_LPAR)
1031 pr_info("Linux is running natively in 64-bit mode\n");
1032 else
1033 pr_info("Linux is running as a guest in 64-bit mode\n");
1034
1035 log_component_list();
1036
1037 /* Have one command line that is parsed and saved in /proc/cmdline */
1038 /* boot_command_line has been already set up in early.c */
1039 *cmdline_p = boot_command_line;
1040
1041 ROOT_DEV = Root_RAM0;
1042
1043 setup_initial_init_mm(_text, _etext, _edata, _end);
1044
1045 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1046 nospec_auto_detect();
1047
1048 jump_label_init();
1049 parse_early_param();
1050#ifdef CONFIG_CRASH_DUMP
1051 /* Deactivate elfcorehdr= kernel parameter */
1052 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1053#endif
1054
1055 os_info_init();
1056 setup_ipl();
1057 setup_task_size();
1058 setup_control_program_code();
1059
1060 /* Do some memory reservations *before* memory is added to memblock */
1061 reserve_above_ident_map();
1062 reserve_kernel();
1063 reserve_initrd();
1064 reserve_certificate_list();
1065 reserve_mem_detect_info();
1066 memblock_allow_resize();
1067
1068 /* Get information about *all* installed memory */
1069 memblock_add_mem_detect_info();
1070
1071 free_mem_detect_info();
1072
1073 setup_uv();
1074 setup_memory_end();
1075 setup_memory();
1076 dma_contiguous_reserve(ident_map_size);
1077 vmcp_cma_reserve();
1078 if (MACHINE_HAS_EDAT2)
1079 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1080
1081 check_initrd();
1082 reserve_crashkernel();
1083#ifdef CONFIG_CRASH_DUMP
1084 /*
1085 * Be aware that smp_save_dump_cpus() triggers a system reset.
1086 * Therefore CPU and device initialization should be done afterwards.
1087 */
1088 smp_save_dump_cpus();
1089#endif
1090
1091 setup_resources();
1092 setup_lowcore_dat_off();
1093 smp_fill_possible_mask();
1094 cpu_detect_mhz_feature();
1095 cpu_init();
1096 numa_setup();
1097 smp_detect_cpus();
1098 topology_init_early();
1099
1100 /*
1101 * Create kernel page tables and switch to virtual addressing.
1102 */
1103 paging_init();
1104
1105 /*
1106 * After paging_init created the kernel page table, the new PSWs
1107 * in lowcore can now run with DAT enabled.
1108 */
1109 setup_lowcore_dat_on();
1110
1111 /* Setup default console */
1112 conmode_default();
1113 set_preferred_console();
1114
1115 apply_alternative_instructions();
1116 if (IS_ENABLED(CONFIG_EXPOLINE))
1117 nospec_init_branches();
1118
1119 /* Setup zfcp/nvme dump support */
1120 setup_zfcpdump();
1121
1122 /* Add system specific data to the random pool */
1123 setup_randomness();
1124}