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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-map-ops.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52#include <linux/hugetlb.h>
53#include <linux/kmemleak.h>
54
55#include <asm/archrandom.h>
56#include <asm/boot_data.h>
57#include <asm/ipl.h>
58#include <asm/facility.h>
59#include <asm/smp.h>
60#include <asm/mmu_context.h>
61#include <asm/cpcmd.h>
62#include <asm/abs_lowcore.h>
63#include <asm/nmi.h>
64#include <asm/irq.h>
65#include <asm/page.h>
66#include <asm/ptrace.h>
67#include <asm/sections.h>
68#include <asm/ebcdic.h>
69#include <asm/diag.h>
70#include <asm/os_info.h>
71#include <asm/sclp.h>
72#include <asm/stacktrace.h>
73#include <asm/sysinfo.h>
74#include <asm/numa.h>
75#include <asm/alternative.h>
76#include <asm/nospec-branch.h>
77#include <asm/physmem_info.h>
78#include <asm/maccess.h>
79#include <asm/uv.h>
80#include <asm/asm-offsets.h>
81#include "entry.h"
82
83/*
84 * Machine setup..
85 */
86unsigned int console_mode = 0;
87EXPORT_SYMBOL(console_mode);
88
89unsigned int console_devno = -1;
90EXPORT_SYMBOL(console_devno);
91
92unsigned int console_irq = -1;
93EXPORT_SYMBOL(console_irq);
94
95/*
96 * Some code and data needs to stay below 2 GB, even when the kernel would be
97 * relocated above 2 GB, because it has to use 31 bit addresses.
98 * Such code and data is part of the .amode31 section.
99 */
100char __amode31_ref *__samode31 = _samode31;
101char __amode31_ref *__eamode31 = _eamode31;
102char __amode31_ref *__stext_amode31 = _stext_amode31;
103char __amode31_ref *__etext_amode31 = _etext_amode31;
104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
106
107/*
108 * Control registers CR2, CR5 and CR15 are initialized with addresses
109 * of tables that must be placed below 2G which is handled by the AMODE31
110 * sections.
111 * Because the AMODE31 sections are relocated below 2G at startup,
112 * the content of control registers CR2, CR5 and CR15 must be updated
113 * with new addresses after the relocation. The initial initialization of
114 * control registers occurs in head64.S and then gets updated again after AMODE31
115 * relocation. We must access the relevant AMODE31 tables indirectly via
116 * pointers placed in the .amode31.refs linker section. Those pointers get
117 * updated automatically during AMODE31 relocation and always contain a valid
118 * address within AMODE31 sections.
119 */
120
121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125};
126
127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
128 0x80000000, 0, 0, 0,
129 0x80000000, 0, 0, 0,
130 0x80000000, 0, 0, 0,
131 0x80000000, 0, 0, 0,
132 0x80000000, 0, 0, 0,
133 0x80000000, 0, 0, 0,
134 0x80000000, 0, 0, 0,
135 0x80000000, 0, 0, 0
136};
137
138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141};
142
143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148unsigned long __bootdata_preserved(max_mappable);
149struct physmem_info __bootdata(physmem_info);
150
151struct vm_layout __bootdata_preserved(vm_layout);
152EXPORT_SYMBOL(vm_layout);
153int __bootdata_preserved(__kaslr_enabled);
154unsigned int __bootdata_preserved(zlib_dfltcc_support);
155EXPORT_SYMBOL(zlib_dfltcc_support);
156u64 __bootdata_preserved(stfle_fac_list[16]);
157EXPORT_SYMBOL(stfle_fac_list);
158struct oldmem_data __bootdata_preserved(oldmem_data);
159
160unsigned long VMALLOC_START;
161EXPORT_SYMBOL(VMALLOC_START);
162
163unsigned long VMALLOC_END;
164EXPORT_SYMBOL(VMALLOC_END);
165
166struct page *vmemmap;
167EXPORT_SYMBOL(vmemmap);
168unsigned long vmemmap_size;
169
170unsigned long MODULES_VADDR;
171unsigned long MODULES_END;
172
173/* An array with a pointer to the lowcore of every CPU. */
174struct lowcore *lowcore_ptr[NR_CPUS];
175EXPORT_SYMBOL(lowcore_ptr);
176
177DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
178
179/*
180 * The Write Back bit position in the physaddr is given by the SLPC PCI.
181 * Leaving the mask zero always uses write through which is safe
182 */
183unsigned long mio_wb_bit_mask __ro_after_init;
184
185/*
186 * This is set up by the setup-routine at boot-time
187 * for S390 need to find out, what we have to setup
188 * using address 0x10400 ...
189 */
190
191#include <asm/setup.h>
192
193/*
194 * condev= and conmode= setup parameter.
195 */
196
197static int __init condev_setup(char *str)
198{
199 int vdev;
200
201 vdev = simple_strtoul(str, &str, 0);
202 if (vdev >= 0 && vdev < 65536) {
203 console_devno = vdev;
204 console_irq = -1;
205 }
206 return 1;
207}
208
209__setup("condev=", condev_setup);
210
211static void __init set_preferred_console(void)
212{
213 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
214 add_preferred_console("ttyS", 0, NULL);
215 else if (CONSOLE_IS_3270)
216 add_preferred_console("tty3270", 0, NULL);
217 else if (CONSOLE_IS_VT220)
218 add_preferred_console("ttysclp", 0, NULL);
219 else if (CONSOLE_IS_HVC)
220 add_preferred_console("hvc", 0, NULL);
221}
222
223static int __init conmode_setup(char *str)
224{
225#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
226 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
227 SET_CONSOLE_SCLP;
228#endif
229#if defined(CONFIG_TN3215_CONSOLE)
230 if (!strcmp(str, "3215"))
231 SET_CONSOLE_3215;
232#endif
233#if defined(CONFIG_TN3270_CONSOLE)
234 if (!strcmp(str, "3270"))
235 SET_CONSOLE_3270;
236#endif
237 set_preferred_console();
238 return 1;
239}
240
241__setup("conmode=", conmode_setup);
242
243static void __init conmode_default(void)
244{
245 char query_buffer[1024];
246 char *ptr;
247
248 if (MACHINE_IS_VM) {
249 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
250 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
251 ptr = strstr(query_buffer, "SUBCHANNEL =");
252 console_irq = simple_strtoul(ptr + 13, NULL, 16);
253 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
254 ptr = strstr(query_buffer, "CONMODE");
255 /*
256 * Set the conmode to 3215 so that the device recognition
257 * will set the cu_type of the console to 3215. If the
258 * conmode is 3270 and we don't set it back then both
259 * 3215 and the 3270 driver will try to access the console
260 * device (3215 as console and 3270 as normal tty).
261 */
262 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
263 if (ptr == NULL) {
264#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
265 SET_CONSOLE_SCLP;
266#endif
267 return;
268 }
269 if (str_has_prefix(ptr + 8, "3270")) {
270#if defined(CONFIG_TN3270_CONSOLE)
271 SET_CONSOLE_3270;
272#elif defined(CONFIG_TN3215_CONSOLE)
273 SET_CONSOLE_3215;
274#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
275 SET_CONSOLE_SCLP;
276#endif
277 } else if (str_has_prefix(ptr + 8, "3215")) {
278#if defined(CONFIG_TN3215_CONSOLE)
279 SET_CONSOLE_3215;
280#elif defined(CONFIG_TN3270_CONSOLE)
281 SET_CONSOLE_3270;
282#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
283 SET_CONSOLE_SCLP;
284#endif
285 }
286 } else if (MACHINE_IS_KVM) {
287 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
288 SET_CONSOLE_VT220;
289 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
290 SET_CONSOLE_SCLP;
291 else
292 SET_CONSOLE_HVC;
293 } else {
294#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
295 SET_CONSOLE_SCLP;
296#endif
297 }
298}
299
300#ifdef CONFIG_CRASH_DUMP
301static void __init setup_zfcpdump(void)
302{
303 if (!is_ipl_type_dump())
304 return;
305 if (oldmem_data.start)
306 return;
307 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
308 console_loglevel = 2;
309}
310#else
311static inline void setup_zfcpdump(void) {}
312#endif /* CONFIG_CRASH_DUMP */
313
314 /*
315 * Reboot, halt and power_off stubs. They just call _machine_restart,
316 * _machine_halt or _machine_power_off.
317 */
318
319void machine_restart(char *command)
320{
321 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
322 /*
323 * Only unblank the console if we are called in enabled
324 * context or a bust_spinlocks cleared the way for us.
325 */
326 console_unblank();
327 _machine_restart(command);
328}
329
330void machine_halt(void)
331{
332 if (!in_interrupt() || oops_in_progress)
333 /*
334 * Only unblank the console if we are called in enabled
335 * context or a bust_spinlocks cleared the way for us.
336 */
337 console_unblank();
338 _machine_halt();
339}
340
341void machine_power_off(void)
342{
343 if (!in_interrupt() || oops_in_progress)
344 /*
345 * Only unblank the console if we are called in enabled
346 * context or a bust_spinlocks cleared the way for us.
347 */
348 console_unblank();
349 _machine_power_off();
350}
351
352/*
353 * Dummy power off function.
354 */
355void (*pm_power_off)(void) = machine_power_off;
356EXPORT_SYMBOL_GPL(pm_power_off);
357
358void *restart_stack;
359
360unsigned long stack_alloc(void)
361{
362#ifdef CONFIG_VMAP_STACK
363 void *ret;
364
365 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
366 NUMA_NO_NODE, __builtin_return_address(0));
367 kmemleak_not_leak(ret);
368 return (unsigned long)ret;
369#else
370 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
371#endif
372}
373
374void stack_free(unsigned long stack)
375{
376#ifdef CONFIG_VMAP_STACK
377 vfree((void *) stack);
378#else
379 free_pages(stack, THREAD_SIZE_ORDER);
380#endif
381}
382
383static unsigned long __init stack_alloc_early(void)
384{
385 unsigned long stack;
386
387 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
388 if (!stack) {
389 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
390 __func__, THREAD_SIZE, THREAD_SIZE);
391 }
392 return stack;
393}
394
395static void __init setup_lowcore(void)
396{
397 struct lowcore *lc, *abs_lc;
398
399 /*
400 * Setup lowcore for boot cpu
401 */
402 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
403 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
404 if (!lc)
405 panic("%s: Failed to allocate %zu bytes align=%zx\n",
406 __func__, sizeof(*lc), sizeof(*lc));
407
408 lc->pcpu = (unsigned long)per_cpu_ptr(&pcpu_devices, 0);
409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
410 lc->restart_psw.addr = __pa(restart_int_handler);
411 lc->external_new_psw.mask = PSW_KERNEL_BITS;
412 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
413 lc->svc_new_psw.mask = PSW_KERNEL_BITS;
414 lc->svc_new_psw.addr = (unsigned long) system_call;
415 lc->program_new_psw.mask = PSW_KERNEL_BITS;
416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
419 lc->io_new_psw.mask = PSW_KERNEL_BITS;
420 lc->io_new_psw.addr = (unsigned long) io_int_handler;
421 lc->clock_comparator = clock_comparator_max;
422 lc->current_task = (unsigned long)&init_task;
423 lc->lpp = LPP_MAGIC;
424 lc->machine_flags = get_lowcore()->machine_flags;
425 lc->preempt_count = get_lowcore()->preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = get_lowcore()->sys_enter_timer;
428 lc->exit_timer = get_lowcore()->exit_timer;
429 lc->user_timer = get_lowcore()->user_timer;
430 lc->system_timer = get_lowcore()->system_timer;
431 lc->steal_timer = get_lowcore()->steal_timer;
432 lc->last_update_timer = get_lowcore()->last_update_timer;
433 lc->last_update_clock = get_lowcore()->last_update_clock;
434 /*
435 * Allocate the global restart stack which is the same for
436 * all CPUs in case *one* of them does a PSW restart.
437 */
438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
442 lc->kernel_stack = get_lowcore()->kernel_stack;
443 /*
444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
445 * restart data to the absolute zero lowcore. This is necessary if
446 * PSW restart is done on an offline CPU that has lowcore zero.
447 */
448 lc->restart_stack = (unsigned long) restart_stack;
449 lc->restart_fn = (unsigned long) do_restart;
450 lc->restart_data = 0;
451 lc->restart_source = -1U;
452 lc->spinlock_lockval = arch_spin_lockval(0);
453 lc->spinlock_index = 0;
454 arch_spin_lock_setup(0);
455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
457 lc->preempt_count = PREEMPT_DISABLED;
458 lc->kernel_asce = get_lowcore()->kernel_asce;
459 lc->user_asce = get_lowcore()->user_asce;
460
461 system_ctlreg_init_save_area(lc);
462 abs_lc = get_abs_lowcore();
463 abs_lc->restart_stack = lc->restart_stack;
464 abs_lc->restart_fn = lc->restart_fn;
465 abs_lc->restart_data = lc->restart_data;
466 abs_lc->restart_source = lc->restart_source;
467 abs_lc->restart_psw = lc->restart_psw;
468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
469 abs_lc->program_new_psw = lc->program_new_psw;
470 abs_lc->mcesad = lc->mcesad;
471 put_abs_lowcore(abs_lc);
472
473 set_prefix(__pa(lc));
474 lowcore_ptr[0] = lc;
475 if (abs_lowcore_map(0, lowcore_ptr[0], false))
476 panic("Couldn't setup absolute lowcore");
477}
478
479static struct resource code_resource = {
480 .name = "Kernel code",
481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
482};
483
484static struct resource data_resource = {
485 .name = "Kernel data",
486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
487};
488
489static struct resource bss_resource = {
490 .name = "Kernel bss",
491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
492};
493
494static struct resource __initdata *standard_resources[] = {
495 &code_resource,
496 &data_resource,
497 &bss_resource,
498};
499
500static void __init setup_resources(void)
501{
502 struct resource *res, *std_res, *sub_res;
503 phys_addr_t start, end;
504 int j;
505 u64 i;
506
507 code_resource.start = __pa_symbol(_text);
508 code_resource.end = __pa_symbol(_etext) - 1;
509 data_resource.start = __pa_symbol(_etext);
510 data_resource.end = __pa_symbol(_edata) - 1;
511 bss_resource.start = __pa_symbol(__bss_start);
512 bss_resource.end = __pa_symbol(__bss_stop) - 1;
513
514 for_each_mem_range(i, &start, &end) {
515 res = memblock_alloc(sizeof(*res), 8);
516 if (!res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*res), 8);
519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
520
521 res->name = "System RAM";
522 res->start = start;
523 /*
524 * In memblock, end points to the first byte after the
525 * range while in resources, end points to the last byte in
526 * the range.
527 */
528 res->end = end - 1;
529 request_resource(&iomem_resource, res);
530
531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
532 std_res = standard_resources[j];
533 if (std_res->start < res->start ||
534 std_res->start > res->end)
535 continue;
536 if (std_res->end > res->end) {
537 sub_res = memblock_alloc(sizeof(*sub_res), 8);
538 if (!sub_res)
539 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
540 __func__, sizeof(*sub_res), 8);
541 *sub_res = *std_res;
542 sub_res->end = res->end;
543 std_res->start = res->end + 1;
544 request_resource(res, sub_res);
545 } else {
546 request_resource(res, std_res);
547 }
548 }
549 }
550#ifdef CONFIG_CRASH_DUMP
551 /*
552 * Re-add removed crash kernel memory as reserved memory. This makes
553 * sure it will be mapped with the identity mapping and struct pages
554 * will be created, so it can be resized later on.
555 * However add it later since the crash kernel resource should not be
556 * part of the System RAM resource.
557 */
558 if (crashk_res.end) {
559 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
560 0, MEMBLOCK_NONE);
561 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
562 insert_resource(&iomem_resource, &crashk_res);
563 }
564#endif
565}
566
567static void __init setup_memory_end(void)
568{
569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
571}
572
573#ifdef CONFIG_CRASH_DUMP
574
575/*
576 * When kdump is enabled, we have to ensure that no memory from the area
577 * [0 - crashkernel memory size] is set offline - it will be exchanged with
578 * the crashkernel memory region when kdump is triggered. The crashkernel
579 * memory region can never get offlined (pages are unmovable).
580 */
581static int kdump_mem_notifier(struct notifier_block *nb,
582 unsigned long action, void *data)
583{
584 struct memory_notify *arg = data;
585
586 if (action != MEM_GOING_OFFLINE)
587 return NOTIFY_OK;
588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
589 return NOTIFY_BAD;
590 return NOTIFY_OK;
591}
592
593static struct notifier_block kdump_mem_nb = {
594 .notifier_call = kdump_mem_notifier,
595};
596
597#endif
598
599/*
600 * Reserve page tables created by decompressor
601 */
602static void __init reserve_pgtables(void)
603{
604 unsigned long start, end;
605 struct reserved_range *range;
606
607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
608 memblock_reserve(start, end - start);
609}
610
611/*
612 * Reserve memory for kdump kernel to be loaded with kexec
613 */
614static void __init reserve_crashkernel(void)
615{
616#ifdef CONFIG_CRASH_DUMP
617 unsigned long long crash_base, crash_size;
618 phys_addr_t low, high;
619 int rc;
620
621 rc = parse_crashkernel(boot_command_line, ident_map_size,
622 &crash_size, &crash_base, NULL, NULL);
623
624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
626 if (rc || crash_size == 0)
627 return;
628
629 if (memblock.memory.regions[0].size < crash_size) {
630 pr_info("crashkernel reservation failed: %s\n",
631 "first memory chunk must be at least crashkernel size");
632 return;
633 }
634
635 low = crash_base ?: oldmem_data.start;
636 high = low + crash_size;
637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
639 crash_base = low;
640 } else {
641 /* Find suitable area in free memory */
642 low = max_t(unsigned long, crash_size, sclp.hsa_size);
643 high = crash_base ? crash_base + crash_size : ULONG_MAX;
644
645 if (crash_base && crash_base < low) {
646 pr_info("crashkernel reservation failed: %s\n",
647 "crash_base too low");
648 return;
649 }
650 low = crash_base ?: low;
651 crash_base = memblock_phys_alloc_range(crash_size,
652 KEXEC_CRASH_MEM_ALIGN,
653 low, high);
654 }
655
656 if (!crash_base) {
657 pr_info("crashkernel reservation failed: %s\n",
658 "no suitable area found");
659 return;
660 }
661
662 if (register_memory_notifier(&kdump_mem_nb)) {
663 memblock_phys_free(crash_base, crash_size);
664 return;
665 }
666
667 if (!oldmem_data.start && MACHINE_IS_VM)
668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
669 crashk_res.start = crash_base;
670 crashk_res.end = crash_base + crash_size - 1;
671 memblock_remove(crash_base, crash_size);
672 pr_info("Reserving %lluMB of memory at %lluMB "
673 "for crashkernel (System RAM: %luMB)\n",
674 crash_size >> 20, crash_base >> 20,
675 (unsigned long)memblock.memory.total_size >> 20);
676 os_info_crashkernel_add(crash_base, crash_size);
677#endif
678}
679
680/*
681 * Reserve the initrd from being used by memblock
682 */
683static void __init reserve_initrd(void)
684{
685 unsigned long addr, size;
686
687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
688 return;
689 initrd_start = (unsigned long)__va(addr);
690 initrd_end = initrd_start + size;
691 memblock_reserve(addr, size);
692}
693
694/*
695 * Reserve the memory area used to pass the certificate lists
696 */
697static void __init reserve_certificate_list(void)
698{
699 if (ipl_cert_list_addr)
700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
701}
702
703static void __init reserve_physmem_info(void)
704{
705 unsigned long addr, size;
706
707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
708 memblock_reserve(addr, size);
709}
710
711static void __init free_physmem_info(void)
712{
713 unsigned long addr, size;
714
715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
716 memblock_phys_free(addr, size);
717}
718
719static void __init memblock_add_physmem_info(void)
720{
721 unsigned long start, end;
722 int i;
723
724 pr_debug("physmem info source: %s (%hhd)\n",
725 get_physmem_info_source(), physmem_info.info_source);
726 /* keep memblock lists close to the kernel */
727 memblock_set_bottom_up(true);
728 for_each_physmem_usable_range(i, &start, &end)
729 memblock_add(start, end - start);
730 for_each_physmem_online_range(i, &start, &end)
731 memblock_physmem_add(start, end - start);
732 memblock_set_bottom_up(false);
733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
734}
735
736/*
737 * Reserve memory used for lowcore.
738 */
739static void __init reserve_lowcore(void)
740{
741 void *lowcore_start = get_lowcore();
742 void *lowcore_end = lowcore_start + sizeof(struct lowcore);
743 void *start, *end;
744
745 if ((void *)__identity_base < lowcore_end) {
746 start = max(lowcore_start, (void *)__identity_base);
747 end = min(lowcore_end, (void *)(__identity_base + ident_map_size));
748 memblock_reserve(__pa(start), __pa(end));
749 }
750}
751
752/*
753 * Reserve memory used for absolute lowcore/command line/kernel image.
754 */
755static void __init reserve_kernel(void)
756{
757 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
758 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
759 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
760 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
761 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
762 memblock_reserve(__pa(_stext), _end - _stext);
763}
764
765static void __init setup_memory(void)
766{
767 phys_addr_t start, end;
768 u64 i;
769
770 /*
771 * Init storage key for present memory
772 */
773 for_each_mem_range(i, &start, &end)
774 storage_key_init_range(start, end);
775
776 psw_set_key(PAGE_DEFAULT_KEY);
777}
778
779static void __init relocate_amode31_section(void)
780{
781 unsigned long amode31_size = __eamode31 - __samode31;
782 long amode31_offset, *ptr;
783
784 amode31_offset = AMODE31_START - (unsigned long)__samode31;
785 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
786
787 /* Move original AMODE31 section to the new one */
788 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
789 /* Zero out the old AMODE31 section to catch invalid accesses within it */
790 memset(__samode31, 0, amode31_size);
791
792 /* Update all AMODE31 region references */
793 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
794 *ptr += amode31_offset;
795}
796
797/* This must be called after AMODE31 relocation */
798static void __init setup_cr(void)
799{
800 union ctlreg2 cr2;
801 union ctlreg5 cr5;
802 union ctlreg15 cr15;
803
804 __ctl_duct[1] = (unsigned long)__ctl_aste;
805 __ctl_duct[2] = (unsigned long)__ctl_aste;
806 __ctl_duct[4] = (unsigned long)__ctl_duald;
807
808 /* Update control registers CR2, CR5 and CR15 */
809 local_ctl_store(2, &cr2.reg);
810 local_ctl_store(5, &cr5.reg);
811 local_ctl_store(15, &cr15.reg);
812 cr2.ducto = (unsigned long)__ctl_duct >> 6;
813 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
814 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
815 system_ctl_load(2, &cr2.reg);
816 system_ctl_load(5, &cr5.reg);
817 system_ctl_load(15, &cr15.reg);
818}
819
820/*
821 * Add system information as device randomness
822 */
823static void __init setup_randomness(void)
824{
825 struct sysinfo_3_2_2 *vmms;
826
827 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
828 if (!vmms)
829 panic("Failed to allocate memory for sysinfo structure\n");
830 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
831 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
832 memblock_free(vmms, PAGE_SIZE);
833
834 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
835 static_branch_enable(&s390_arch_random_available);
836}
837
838/*
839 * Issue diagnose 318 to set the control program name and
840 * version codes.
841 */
842static void __init setup_control_program_code(void)
843{
844 union diag318_info diag318_info = {
845 .cpnc = CPNC_LINUX,
846 .cpvc = 0,
847 };
848
849 if (!sclp.has_diag318)
850 return;
851
852 diag_stat_inc(DIAG_STAT_X318);
853 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
854}
855
856/*
857 * Print the component list from the IPL report
858 */
859static void __init log_component_list(void)
860{
861 struct ipl_rb_component_entry *ptr, *end;
862 char *str;
863
864 if (!early_ipl_comp_list_addr)
865 return;
866 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
867 pr_info("Linux is running with Secure-IPL enabled\n");
868 else
869 pr_info("Linux is running with Secure-IPL disabled\n");
870 ptr = __va(early_ipl_comp_list_addr);
871 end = (void *) ptr + early_ipl_comp_list_size;
872 pr_info("The IPL report contains the following components:\n");
873 while (ptr < end) {
874 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
875 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
876 str = "signed, verified";
877 else
878 str = "signed, verification failed";
879 } else {
880 str = "not signed";
881 }
882 pr_info("%016llx - %016llx (%s)\n",
883 ptr->addr, ptr->addr + ptr->len, str);
884 ptr++;
885 }
886}
887
888/*
889 * Setup function called from init/main.c just after the banner
890 * was printed.
891 */
892
893void __init setup_arch(char **cmdline_p)
894{
895 /*
896 * print what head.S has found out about the machine
897 */
898 if (MACHINE_IS_VM)
899 pr_info("Linux is running as a z/VM "
900 "guest operating system in 64-bit mode\n");
901 else if (MACHINE_IS_KVM)
902 pr_info("Linux is running under KVM in 64-bit mode\n");
903 else if (MACHINE_IS_LPAR)
904 pr_info("Linux is running natively in 64-bit mode\n");
905 else
906 pr_info("Linux is running as a guest in 64-bit mode\n");
907
908 if (have_relocated_lowcore())
909 pr_info("Lowcore relocated to 0x%px\n", get_lowcore());
910
911 log_component_list();
912
913 /* Have one command line that is parsed and saved in /proc/cmdline */
914 /* boot_command_line has been already set up in early.c */
915 *cmdline_p = boot_command_line;
916
917 ROOT_DEV = Root_RAM0;
918
919 setup_initial_init_mm(_text, _etext, _edata, _end);
920
921 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
922 nospec_auto_detect();
923
924 jump_label_init();
925 parse_early_param();
926#ifdef CONFIG_CRASH_DUMP
927 /* Deactivate elfcorehdr= kernel parameter */
928 elfcorehdr_addr = ELFCORE_ADDR_MAX;
929#endif
930
931 os_info_init();
932 setup_ipl();
933 setup_control_program_code();
934
935 /* Do some memory reservations *before* memory is added to memblock */
936 reserve_pgtables();
937 reserve_lowcore();
938 reserve_kernel();
939 reserve_initrd();
940 reserve_certificate_list();
941 reserve_physmem_info();
942 memblock_set_current_limit(ident_map_size);
943 memblock_allow_resize();
944
945 /* Get information about *all* installed memory */
946 memblock_add_physmem_info();
947
948 free_physmem_info();
949 setup_memory_end();
950 memblock_dump_all();
951 setup_memory();
952
953 relocate_amode31_section();
954 setup_cr();
955 setup_uv();
956 dma_contiguous_reserve(ident_map_size);
957 vmcp_cma_reserve();
958 if (MACHINE_HAS_EDAT2)
959 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
960
961 reserve_crashkernel();
962#ifdef CONFIG_CRASH_DUMP
963 /*
964 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
965 * Therefore CPU and device initialization should be done afterwards.
966 */
967 smp_save_dump_secondary_cpus();
968#endif
969
970 setup_resources();
971 setup_lowcore();
972 smp_fill_possible_mask();
973 cpu_detect_mhz_feature();
974 cpu_init();
975 numa_setup();
976 smp_detect_cpus();
977 topology_init_early();
978
979 if (test_facility(193))
980 static_branch_enable(&cpu_has_bear);
981
982 /*
983 * Create kernel page tables.
984 */
985 paging_init();
986
987 /*
988 * After paging_init created the kernel page table, the new PSWs
989 * in lowcore can now run with DAT enabled.
990 */
991#ifdef CONFIG_CRASH_DUMP
992 smp_save_dump_ipl_cpu();
993#endif
994
995 /* Setup default console */
996 conmode_default();
997 set_preferred_console();
998
999 apply_alternative_instructions();
1000 if (IS_ENABLED(CONFIG_EXPOLINE))
1001 nospec_init_branches();
1002
1003 /* Setup zfcp/nvme dump support */
1004 setup_zfcpdump();
1005
1006 /* Add system specific data to the random pool */
1007 setup_randomness();
1008}
1009
1010void __init arch_cpu_finalize_init(void)
1011{
1012 sclp_init();
1013}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/bootmem.h>
38#include <linux/root_dev.h>
39#include <linux/console.h>
40#include <linux/kernel_stat.h>
41#include <linux/dma-contiguous.h>
42#include <linux/device.h>
43#include <linux/notifier.h>
44#include <linux/pfn.h>
45#include <linux/ctype.h>
46#include <linux/reboot.h>
47#include <linux/topology.h>
48#include <linux/kexec.h>
49#include <linux/crash_dump.h>
50#include <linux/memory.h>
51#include <linux/compat.h>
52
53#include <asm/ipl.h>
54#include <asm/facility.h>
55#include <asm/smp.h>
56#include <asm/mmu_context.h>
57#include <asm/cpcmd.h>
58#include <asm/lowcore.h>
59#include <asm/nmi.h>
60#include <asm/irq.h>
61#include <asm/page.h>
62#include <asm/ptrace.h>
63#include <asm/sections.h>
64#include <asm/ebcdic.h>
65#include <asm/diag.h>
66#include <asm/os_info.h>
67#include <asm/sclp.h>
68#include <asm/sysinfo.h>
69#include <asm/numa.h>
70#include <asm/alternative.h>
71#include <asm/nospec-branch.h>
72#include "entry.h"
73
74/*
75 * Machine setup..
76 */
77unsigned int console_mode = 0;
78EXPORT_SYMBOL(console_mode);
79
80unsigned int console_devno = -1;
81EXPORT_SYMBOL(console_devno);
82
83unsigned int console_irq = -1;
84EXPORT_SYMBOL(console_irq);
85
86unsigned long elf_hwcap __read_mostly = 0;
87char elf_platform[ELF_PLATFORM_SIZE];
88
89unsigned long int_hwcap = 0;
90
91int __initdata memory_end_set;
92unsigned long __initdata memory_end;
93unsigned long __initdata max_physmem_end;
94
95unsigned long VMALLOC_START;
96EXPORT_SYMBOL(VMALLOC_START);
97
98unsigned long VMALLOC_END;
99EXPORT_SYMBOL(VMALLOC_END);
100
101struct page *vmemmap;
102EXPORT_SYMBOL(vmemmap);
103
104unsigned long MODULES_VADDR;
105unsigned long MODULES_END;
106
107/* An array with a pointer to the lowcore of every CPU. */
108struct lowcore *lowcore_ptr[NR_CPUS];
109EXPORT_SYMBOL(lowcore_ptr);
110
111/*
112 * This is set up by the setup-routine at boot-time
113 * for S390 need to find out, what we have to setup
114 * using address 0x10400 ...
115 */
116
117#include <asm/setup.h>
118
119/*
120 * condev= and conmode= setup parameter.
121 */
122
123static int __init condev_setup(char *str)
124{
125 int vdev;
126
127 vdev = simple_strtoul(str, &str, 0);
128 if (vdev >= 0 && vdev < 65536) {
129 console_devno = vdev;
130 console_irq = -1;
131 }
132 return 1;
133}
134
135__setup("condev=", condev_setup);
136
137static void __init set_preferred_console(void)
138{
139 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
140 add_preferred_console("ttyS", 0, NULL);
141 else if (CONSOLE_IS_3270)
142 add_preferred_console("tty3270", 0, NULL);
143 else if (CONSOLE_IS_VT220)
144 add_preferred_console("ttyS", 1, NULL);
145 else if (CONSOLE_IS_HVC)
146 add_preferred_console("hvc", 0, NULL);
147}
148
149static int __init conmode_setup(char *str)
150{
151#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
152 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
153 SET_CONSOLE_SCLP;
154#endif
155#if defined(CONFIG_TN3215_CONSOLE)
156 if (strncmp(str, "3215", 5) == 0)
157 SET_CONSOLE_3215;
158#endif
159#if defined(CONFIG_TN3270_CONSOLE)
160 if (strncmp(str, "3270", 5) == 0)
161 SET_CONSOLE_3270;
162#endif
163 set_preferred_console();
164 return 1;
165}
166
167__setup("conmode=", conmode_setup);
168
169static void __init conmode_default(void)
170{
171 char query_buffer[1024];
172 char *ptr;
173
174 if (MACHINE_IS_VM) {
175 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
176 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
177 ptr = strstr(query_buffer, "SUBCHANNEL =");
178 console_irq = simple_strtoul(ptr + 13, NULL, 16);
179 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
180 ptr = strstr(query_buffer, "CONMODE");
181 /*
182 * Set the conmode to 3215 so that the device recognition
183 * will set the cu_type of the console to 3215. If the
184 * conmode is 3270 and we don't set it back then both
185 * 3215 and the 3270 driver will try to access the console
186 * device (3215 as console and 3270 as normal tty).
187 */
188 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
189 if (ptr == NULL) {
190#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
191 SET_CONSOLE_SCLP;
192#endif
193 return;
194 }
195 if (strncmp(ptr + 8, "3270", 4) == 0) {
196#if defined(CONFIG_TN3270_CONSOLE)
197 SET_CONSOLE_3270;
198#elif defined(CONFIG_TN3215_CONSOLE)
199 SET_CONSOLE_3215;
200#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 SET_CONSOLE_SCLP;
202#endif
203 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
204#if defined(CONFIG_TN3215_CONSOLE)
205 SET_CONSOLE_3215;
206#elif defined(CONFIG_TN3270_CONSOLE)
207 SET_CONSOLE_3270;
208#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 SET_CONSOLE_SCLP;
210#endif
211 }
212 } else if (MACHINE_IS_KVM) {
213 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
214 SET_CONSOLE_VT220;
215 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
216 SET_CONSOLE_SCLP;
217 else
218 SET_CONSOLE_HVC;
219 } else {
220#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
221 SET_CONSOLE_SCLP;
222#endif
223 }
224 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
225 conswitchp = &dummy_con;
226}
227
228#ifdef CONFIG_CRASH_DUMP
229static void __init setup_zfcpdump(void)
230{
231 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
232 return;
233 if (OLDMEM_BASE)
234 return;
235 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
236 console_loglevel = 2;
237}
238#else
239static inline void setup_zfcpdump(void) {}
240#endif /* CONFIG_CRASH_DUMP */
241
242 /*
243 * Reboot, halt and power_off stubs. They just call _machine_restart,
244 * _machine_halt or _machine_power_off.
245 */
246
247void machine_restart(char *command)
248{
249 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
250 /*
251 * Only unblank the console if we are called in enabled
252 * context or a bust_spinlocks cleared the way for us.
253 */
254 console_unblank();
255 _machine_restart(command);
256}
257
258void machine_halt(void)
259{
260 if (!in_interrupt() || oops_in_progress)
261 /*
262 * Only unblank the console if we are called in enabled
263 * context or a bust_spinlocks cleared the way for us.
264 */
265 console_unblank();
266 _machine_halt();
267}
268
269void machine_power_off(void)
270{
271 if (!in_interrupt() || oops_in_progress)
272 /*
273 * Only unblank the console if we are called in enabled
274 * context or a bust_spinlocks cleared the way for us.
275 */
276 console_unblank();
277 _machine_power_off();
278}
279
280/*
281 * Dummy power off function.
282 */
283void (*pm_power_off)(void) = machine_power_off;
284EXPORT_SYMBOL_GPL(pm_power_off);
285
286static int __init early_parse_mem(char *p)
287{
288 memory_end = memparse(p, &p);
289 memory_end &= PAGE_MASK;
290 memory_end_set = 1;
291 return 0;
292}
293early_param("mem", early_parse_mem);
294
295static int __init parse_vmalloc(char *arg)
296{
297 if (!arg)
298 return -EINVAL;
299 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
300 return 0;
301}
302early_param("vmalloc", parse_vmalloc);
303
304void *restart_stack __section(.data);
305
306static void __init setup_lowcore(void)
307{
308 struct lowcore *lc;
309
310 /*
311 * Setup lowcore for boot cpu
312 */
313 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
314 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
315 lc->restart_psw.mask = PSW_KERNEL_BITS;
316 lc->restart_psw.addr = (unsigned long) restart_int_handler;
317 lc->external_new_psw.mask = PSW_KERNEL_BITS |
318 PSW_MASK_DAT | PSW_MASK_MCHECK;
319 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
320 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
321 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
322 lc->svc_new_psw.addr = (unsigned long) system_call;
323 lc->program_new_psw.mask = PSW_KERNEL_BITS |
324 PSW_MASK_DAT | PSW_MASK_MCHECK;
325 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
326 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
327 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
328 lc->io_new_psw.mask = PSW_KERNEL_BITS |
329 PSW_MASK_DAT | PSW_MASK_MCHECK;
330 lc->io_new_psw.addr = (unsigned long) io_int_handler;
331 lc->clock_comparator = clock_comparator_max;
332 lc->kernel_stack = ((unsigned long) &init_thread_union)
333 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
334 lc->async_stack = (unsigned long)
335 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
336 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
337 lc->panic_stack = (unsigned long)
338 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
339 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
340 lc->current_task = (unsigned long)&init_task;
341 lc->lpp = LPP_MAGIC;
342 lc->machine_flags = S390_lowcore.machine_flags;
343 lc->preempt_count = S390_lowcore.preempt_count;
344 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
345 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
346 sizeof(lc->stfle_fac_list));
347 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
348 sizeof(lc->alt_stfle_fac_list));
349 nmi_alloc_boot_cpu(lc);
350 vdso_alloc_boot_cpu(lc);
351 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
352 lc->async_enter_timer = S390_lowcore.async_enter_timer;
353 lc->exit_timer = S390_lowcore.exit_timer;
354 lc->user_timer = S390_lowcore.user_timer;
355 lc->system_timer = S390_lowcore.system_timer;
356 lc->steal_timer = S390_lowcore.steal_timer;
357 lc->last_update_timer = S390_lowcore.last_update_timer;
358 lc->last_update_clock = S390_lowcore.last_update_clock;
359
360 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
361 restart_stack += ASYNC_SIZE;
362
363 /*
364 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
365 * restart data to the absolute zero lowcore. This is necessary if
366 * PSW restart is done on an offline CPU that has lowcore zero.
367 */
368 lc->restart_stack = (unsigned long) restart_stack;
369 lc->restart_fn = (unsigned long) do_restart;
370 lc->restart_data = 0;
371 lc->restart_source = -1UL;
372
373 /* Setup absolute zero lowcore */
374 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
375 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
376 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
377 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
378 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
379
380#ifdef CONFIG_SMP
381 lc->spinlock_lockval = arch_spin_lockval(0);
382 lc->spinlock_index = 0;
383 arch_spin_lock_setup(0);
384#endif
385 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
386
387 set_prefix((u32)(unsigned long) lc);
388 lowcore_ptr[0] = lc;
389}
390
391static struct resource code_resource = {
392 .name = "Kernel code",
393 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
394};
395
396static struct resource data_resource = {
397 .name = "Kernel data",
398 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
399};
400
401static struct resource bss_resource = {
402 .name = "Kernel bss",
403 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
404};
405
406static struct resource __initdata *standard_resources[] = {
407 &code_resource,
408 &data_resource,
409 &bss_resource,
410};
411
412static void __init setup_resources(void)
413{
414 struct resource *res, *std_res, *sub_res;
415 struct memblock_region *reg;
416 int j;
417
418 code_resource.start = (unsigned long) _text;
419 code_resource.end = (unsigned long) _etext - 1;
420 data_resource.start = (unsigned long) _etext;
421 data_resource.end = (unsigned long) _edata - 1;
422 bss_resource.start = (unsigned long) __bss_start;
423 bss_resource.end = (unsigned long) __bss_stop - 1;
424
425 for_each_memblock(memory, reg) {
426 res = memblock_virt_alloc(sizeof(*res), 8);
427 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
428
429 res->name = "System RAM";
430 res->start = reg->base;
431 res->end = reg->base + reg->size - 1;
432 request_resource(&iomem_resource, res);
433
434 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
435 std_res = standard_resources[j];
436 if (std_res->start < res->start ||
437 std_res->start > res->end)
438 continue;
439 if (std_res->end > res->end) {
440 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8);
441 *sub_res = *std_res;
442 sub_res->end = res->end;
443 std_res->start = res->end + 1;
444 request_resource(res, sub_res);
445 } else {
446 request_resource(res, std_res);
447 }
448 }
449 }
450#ifdef CONFIG_CRASH_DUMP
451 /*
452 * Re-add removed crash kernel memory as reserved memory. This makes
453 * sure it will be mapped with the identity mapping and struct pages
454 * will be created, so it can be resized later on.
455 * However add it later since the crash kernel resource should not be
456 * part of the System RAM resource.
457 */
458 if (crashk_res.end) {
459 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
460 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
461 insert_resource(&iomem_resource, &crashk_res);
462 }
463#endif
464}
465
466static void __init setup_memory_end(void)
467{
468 unsigned long vmax, vmalloc_size, tmp;
469
470 /* Choose kernel address space layout: 2, 3, or 4 levels. */
471 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
472 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
473 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
474 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
475 vmax = _REGION2_SIZE; /* 3-level kernel page table */
476 else
477 vmax = _REGION1_SIZE; /* 4-level kernel page table */
478 /* module area is at the end of the kernel address space. */
479 MODULES_END = vmax;
480 MODULES_VADDR = MODULES_END - MODULES_LEN;
481 VMALLOC_END = MODULES_VADDR;
482 VMALLOC_START = vmax - vmalloc_size;
483
484 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
485 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
486 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
487 tmp = SECTION_ALIGN_UP(tmp);
488 tmp = VMALLOC_START - tmp * sizeof(struct page);
489 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
490 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
491 vmemmap = (struct page *) tmp;
492
493 /* Take care that memory_end is set and <= vmemmap */
494 memory_end = min(memory_end ?: max_physmem_end, tmp);
495 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
496 memblock_remove(memory_end, ULONG_MAX);
497
498 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
499}
500
501#ifdef CONFIG_CRASH_DUMP
502
503/*
504 * When kdump is enabled, we have to ensure that no memory from
505 * the area [0 - crashkernel memory size] and
506 * [crashk_res.start - crashk_res.end] is set offline.
507 */
508static int kdump_mem_notifier(struct notifier_block *nb,
509 unsigned long action, void *data)
510{
511 struct memory_notify *arg = data;
512
513 if (action != MEM_GOING_OFFLINE)
514 return NOTIFY_OK;
515 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
516 return NOTIFY_BAD;
517 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
518 return NOTIFY_OK;
519 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
520 return NOTIFY_OK;
521 return NOTIFY_BAD;
522}
523
524static struct notifier_block kdump_mem_nb = {
525 .notifier_call = kdump_mem_notifier,
526};
527
528#endif
529
530/*
531 * Make sure that the area behind memory_end is protected
532 */
533static void reserve_memory_end(void)
534{
535#ifdef CONFIG_CRASH_DUMP
536 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
537 !OLDMEM_BASE && sclp.hsa_size) {
538 memory_end = sclp.hsa_size;
539 memory_end &= PAGE_MASK;
540 memory_end_set = 1;
541 }
542#endif
543 if (!memory_end_set)
544 return;
545 memblock_reserve(memory_end, ULONG_MAX);
546}
547
548/*
549 * Make sure that oldmem, where the dump is stored, is protected
550 */
551static void reserve_oldmem(void)
552{
553#ifdef CONFIG_CRASH_DUMP
554 if (OLDMEM_BASE)
555 /* Forget all memory above the running kdump system */
556 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
557#endif
558}
559
560/*
561 * Make sure that oldmem, where the dump is stored, is protected
562 */
563static void remove_oldmem(void)
564{
565#ifdef CONFIG_CRASH_DUMP
566 if (OLDMEM_BASE)
567 /* Forget all memory above the running kdump system */
568 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
569#endif
570}
571
572/*
573 * Reserve memory for kdump kernel to be loaded with kexec
574 */
575static void __init reserve_crashkernel(void)
576{
577#ifdef CONFIG_CRASH_DUMP
578 unsigned long long crash_base, crash_size;
579 phys_addr_t low, high;
580 int rc;
581
582 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
583 &crash_base);
584
585 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
586 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
587 if (rc || crash_size == 0)
588 return;
589
590 if (memblock.memory.regions[0].size < crash_size) {
591 pr_info("crashkernel reservation failed: %s\n",
592 "first memory chunk must be at least crashkernel size");
593 return;
594 }
595
596 low = crash_base ?: OLDMEM_BASE;
597 high = low + crash_size;
598 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
599 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
600 crash_base = low;
601 } else {
602 /* Find suitable area in free memory */
603 low = max_t(unsigned long, crash_size, sclp.hsa_size);
604 high = crash_base ? crash_base + crash_size : ULONG_MAX;
605
606 if (crash_base && crash_base < low) {
607 pr_info("crashkernel reservation failed: %s\n",
608 "crash_base too low");
609 return;
610 }
611 low = crash_base ?: low;
612 crash_base = memblock_find_in_range(low, high, crash_size,
613 KEXEC_CRASH_MEM_ALIGN);
614 }
615
616 if (!crash_base) {
617 pr_info("crashkernel reservation failed: %s\n",
618 "no suitable area found");
619 return;
620 }
621
622 if (register_memory_notifier(&kdump_mem_nb))
623 return;
624
625 if (!OLDMEM_BASE && MACHINE_IS_VM)
626 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
627 crashk_res.start = crash_base;
628 crashk_res.end = crash_base + crash_size - 1;
629 memblock_remove(crash_base, crash_size);
630 pr_info("Reserving %lluMB of memory at %lluMB "
631 "for crashkernel (System RAM: %luMB)\n",
632 crash_size >> 20, crash_base >> 20,
633 (unsigned long)memblock.memory.total_size >> 20);
634 os_info_crashkernel_add(crash_base, crash_size);
635#endif
636}
637
638/*
639 * Reserve the initrd from being used by memblock
640 */
641static void __init reserve_initrd(void)
642{
643#ifdef CONFIG_BLK_DEV_INITRD
644 if (!INITRD_START || !INITRD_SIZE)
645 return;
646 initrd_start = INITRD_START;
647 initrd_end = initrd_start + INITRD_SIZE;
648 memblock_reserve(INITRD_START, INITRD_SIZE);
649#endif
650}
651
652/*
653 * Check for initrd being in usable memory
654 */
655static void __init check_initrd(void)
656{
657#ifdef CONFIG_BLK_DEV_INITRD
658 if (INITRD_START && INITRD_SIZE &&
659 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
660 pr_err("The initial RAM disk does not fit into the memory\n");
661 memblock_free(INITRD_START, INITRD_SIZE);
662 initrd_start = initrd_end = 0;
663 }
664#endif
665}
666
667/*
668 * Reserve memory used for lowcore/command line/kernel image.
669 */
670static void __init reserve_kernel(void)
671{
672 unsigned long start_pfn = PFN_UP(__pa(_end));
673
674#ifdef CONFIG_DMA_API_DEBUG
675 /*
676 * DMA_API_DEBUG code stumbles over addresses from the
677 * range [_ehead, _stext]. Mark the memory as reserved
678 * so it is not used for CONFIG_DMA_API_DEBUG=y.
679 */
680 memblock_reserve(0, PFN_PHYS(start_pfn));
681#else
682 memblock_reserve(0, (unsigned long)_ehead);
683 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
684 - (unsigned long)_stext);
685#endif
686}
687
688static void __init setup_memory(void)
689{
690 struct memblock_region *reg;
691
692 /*
693 * Init storage key for present memory
694 */
695 for_each_memblock(memory, reg) {
696 storage_key_init_range(reg->base, reg->base + reg->size);
697 }
698 psw_set_key(PAGE_DEFAULT_KEY);
699
700 /* Only cosmetics */
701 memblock_enforce_memory_limit(memblock_end_of_DRAM());
702}
703
704/*
705 * Setup hardware capabilities.
706 */
707static int __init setup_hwcaps(void)
708{
709 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
710 struct cpuid cpu_id;
711 int i;
712
713 /*
714 * The store facility list bits numbers as found in the principles
715 * of operation are numbered with bit 1UL<<31 as number 0 to
716 * bit 1UL<<0 as number 31.
717 * Bit 0: instructions named N3, "backported" to esa-mode
718 * Bit 2: z/Architecture mode is active
719 * Bit 7: the store-facility-list-extended facility is installed
720 * Bit 17: the message-security assist is installed
721 * Bit 19: the long-displacement facility is installed
722 * Bit 21: the extended-immediate facility is installed
723 * Bit 22: extended-translation facility 3 is installed
724 * Bit 30: extended-translation facility 3 enhancement facility
725 * These get translated to:
726 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
727 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
728 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
729 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
730 */
731 for (i = 0; i < 6; i++)
732 if (test_facility(stfl_bits[i]))
733 elf_hwcap |= 1UL << i;
734
735 if (test_facility(22) && test_facility(30))
736 elf_hwcap |= HWCAP_S390_ETF3EH;
737
738 /*
739 * Check for additional facilities with store-facility-list-extended.
740 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
741 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
742 * as stored by stfl, bits 32-xxx contain additional facilities.
743 * How many facility words are stored depends on the number of
744 * doublewords passed to the instruction. The additional facilities
745 * are:
746 * Bit 42: decimal floating point facility is installed
747 * Bit 44: perform floating point operation facility is installed
748 * translated to:
749 * HWCAP_S390_DFP bit 6 (42 && 44).
750 */
751 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
752 elf_hwcap |= HWCAP_S390_DFP;
753
754 /*
755 * Huge page support HWCAP_S390_HPAGE is bit 7.
756 */
757 if (MACHINE_HAS_EDAT1)
758 elf_hwcap |= HWCAP_S390_HPAGE;
759
760 /*
761 * 64-bit register support for 31-bit processes
762 * HWCAP_S390_HIGH_GPRS is bit 9.
763 */
764 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
765
766 /*
767 * Transactional execution support HWCAP_S390_TE is bit 10.
768 */
769 if (MACHINE_HAS_TE)
770 elf_hwcap |= HWCAP_S390_TE;
771
772 /*
773 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
774 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
775 * instead of facility bit 129.
776 */
777 if (MACHINE_HAS_VX) {
778 elf_hwcap |= HWCAP_S390_VXRS;
779 if (test_facility(134))
780 elf_hwcap |= HWCAP_S390_VXRS_EXT;
781 if (test_facility(135))
782 elf_hwcap |= HWCAP_S390_VXRS_BCD;
783 }
784
785 /*
786 * Guarded storage support HWCAP_S390_GS is bit 12.
787 */
788 if (MACHINE_HAS_GS)
789 elf_hwcap |= HWCAP_S390_GS;
790
791 get_cpu_id(&cpu_id);
792 add_device_randomness(&cpu_id, sizeof(cpu_id));
793 switch (cpu_id.machine) {
794 case 0x2064:
795 case 0x2066:
796 default: /* Use "z900" as default for 64 bit kernels. */
797 strcpy(elf_platform, "z900");
798 break;
799 case 0x2084:
800 case 0x2086:
801 strcpy(elf_platform, "z990");
802 break;
803 case 0x2094:
804 case 0x2096:
805 strcpy(elf_platform, "z9-109");
806 break;
807 case 0x2097:
808 case 0x2098:
809 strcpy(elf_platform, "z10");
810 break;
811 case 0x2817:
812 case 0x2818:
813 strcpy(elf_platform, "z196");
814 break;
815 case 0x2827:
816 case 0x2828:
817 strcpy(elf_platform, "zEC12");
818 break;
819 case 0x2964:
820 case 0x2965:
821 strcpy(elf_platform, "z13");
822 break;
823 case 0x3906:
824 case 0x3907:
825 strcpy(elf_platform, "z14");
826 break;
827 }
828
829 /*
830 * Virtualization support HWCAP_INT_SIE is bit 0.
831 */
832 if (sclp.has_sief2)
833 int_hwcap |= HWCAP_INT_SIE;
834
835 return 0;
836}
837arch_initcall(setup_hwcaps);
838
839/*
840 * Add system information as device randomness
841 */
842static void __init setup_randomness(void)
843{
844 struct sysinfo_3_2_2 *vmms;
845
846 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
847 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
848 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
849 memblock_free((unsigned long) vmms, PAGE_SIZE);
850}
851
852/*
853 * Find the correct size for the task_struct. This depends on
854 * the size of the struct fpu at the end of the thread_struct
855 * which is embedded in the task_struct.
856 */
857static void __init setup_task_size(void)
858{
859 int task_size = sizeof(struct task_struct);
860
861 if (!MACHINE_HAS_VX) {
862 task_size -= sizeof(__vector128) * __NUM_VXRS;
863 task_size += sizeof(freg_t) * __NUM_FPRS;
864 }
865 arch_task_struct_size = task_size;
866}
867
868/*
869 * Setup function called from init/main.c just after the banner
870 * was printed.
871 */
872
873void __init setup_arch(char **cmdline_p)
874{
875 /*
876 * print what head.S has found out about the machine
877 */
878 if (MACHINE_IS_VM)
879 pr_info("Linux is running as a z/VM "
880 "guest operating system in 64-bit mode\n");
881 else if (MACHINE_IS_KVM)
882 pr_info("Linux is running under KVM in 64-bit mode\n");
883 else if (MACHINE_IS_LPAR)
884 pr_info("Linux is running natively in 64-bit mode\n");
885
886 /* Have one command line that is parsed and saved in /proc/cmdline */
887 /* boot_command_line has been already set up in early.c */
888 *cmdline_p = boot_command_line;
889
890 ROOT_DEV = Root_RAM0;
891
892 /* Is init_mm really needed? */
893 init_mm.start_code = PAGE_OFFSET;
894 init_mm.end_code = (unsigned long) _etext;
895 init_mm.end_data = (unsigned long) _edata;
896 init_mm.brk = (unsigned long) _end;
897
898 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
899 nospec_auto_detect();
900
901 parse_early_param();
902#ifdef CONFIG_CRASH_DUMP
903 /* Deactivate elfcorehdr= kernel parameter */
904 elfcorehdr_addr = ELFCORE_ADDR_MAX;
905#endif
906
907 os_info_init();
908 setup_ipl();
909 setup_task_size();
910
911 /* Do some memory reservations *before* memory is added to memblock */
912 reserve_memory_end();
913 reserve_oldmem();
914 reserve_kernel();
915 reserve_initrd();
916 memblock_allow_resize();
917
918 /* Get information about *all* installed memory */
919 detect_memory_memblock();
920
921 remove_oldmem();
922
923 /*
924 * Make sure all chunks are MAX_ORDER aligned so we don't need the
925 * extra checks that HOLES_IN_ZONE would require.
926 *
927 * Is this still required?
928 */
929 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
930
931 setup_memory_end();
932 setup_memory();
933 dma_contiguous_reserve(memory_end);
934 vmcp_cma_reserve();
935
936 check_initrd();
937 reserve_crashkernel();
938#ifdef CONFIG_CRASH_DUMP
939 /*
940 * Be aware that smp_save_dump_cpus() triggers a system reset.
941 * Therefore CPU and device initialization should be done afterwards.
942 */
943 smp_save_dump_cpus();
944#endif
945
946 setup_resources();
947 setup_lowcore();
948 smp_fill_possible_mask();
949 cpu_detect_mhz_feature();
950 cpu_init();
951 numa_setup();
952 smp_detect_cpus();
953 topology_init_early();
954
955 /*
956 * Create kernel page tables and switch to virtual addressing.
957 */
958 paging_init();
959
960 /* Setup default console */
961 conmode_default();
962 set_preferred_console();
963
964 apply_alternative_instructions();
965 if (IS_ENABLED(CONFIG_EXPOLINE))
966 nospec_init_branches();
967
968 /* Setup zfcpdump support */
969 setup_zfcpdump();
970
971 /* Add system specific data to the random pool */
972 setup_randomness();
973}