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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/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-contiguous.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52
53#include <asm/boot_data.h>
54#include <asm/ipl.h>
55#include <asm/facility.h>
56#include <asm/smp.h>
57#include <asm/mmu_context.h>
58#include <asm/cpcmd.h>
59#include <asm/lowcore.h>
60#include <asm/nmi.h>
61#include <asm/irq.h>
62#include <asm/page.h>
63#include <asm/ptrace.h>
64#include <asm/sections.h>
65#include <asm/ebcdic.h>
66#include <asm/diag.h>
67#include <asm/os_info.h>
68#include <asm/sclp.h>
69#include <asm/stacktrace.h>
70#include <asm/sysinfo.h>
71#include <asm/numa.h>
72#include <asm/alternative.h>
73#include <asm/nospec-branch.h>
74#include <asm/mem_detect.h>
75#include <asm/uv.h>
76#include "entry.h"
77
78/*
79 * Machine setup..
80 */
81unsigned int console_mode = 0;
82EXPORT_SYMBOL(console_mode);
83
84unsigned int console_devno = -1;
85EXPORT_SYMBOL(console_devno);
86
87unsigned int console_irq = -1;
88EXPORT_SYMBOL(console_irq);
89
90unsigned long elf_hwcap __read_mostly = 0;
91char elf_platform[ELF_PLATFORM_SIZE];
92
93unsigned long int_hwcap = 0;
94
95#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
96int __bootdata_preserved(prot_virt_guest);
97#endif
98
99int __bootdata(noexec_disabled);
100int __bootdata(memory_end_set);
101unsigned long __bootdata(memory_end);
102unsigned long __bootdata(vmalloc_size);
103unsigned long __bootdata(max_physmem_end);
104struct mem_detect_info __bootdata(mem_detect);
105
106struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
107struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
108unsigned long __bootdata_preserved(__swsusp_reset_dma);
109unsigned long __bootdata_preserved(__stext_dma);
110unsigned long __bootdata_preserved(__etext_dma);
111unsigned long __bootdata_preserved(__sdma);
112unsigned long __bootdata_preserved(__edma);
113unsigned long __bootdata_preserved(__kaslr_offset);
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);
123
124unsigned long MODULES_VADDR;
125unsigned long MODULES_END;
126
127/* An array with a pointer to the lowcore of every CPU. */
128struct lowcore *lowcore_ptr[NR_CPUS];
129EXPORT_SYMBOL(lowcore_ptr);
130
131/*
132 * This is set up by the setup-routine at boot-time
133 * for S390 need to find out, what we have to setup
134 * using address 0x10400 ...
135 */
136
137#include <asm/setup.h>
138
139/*
140 * condev= and conmode= setup parameter.
141 */
142
143static int __init condev_setup(char *str)
144{
145 int vdev;
146
147 vdev = simple_strtoul(str, &str, 0);
148 if (vdev >= 0 && vdev < 65536) {
149 console_devno = vdev;
150 console_irq = -1;
151 }
152 return 1;
153}
154
155__setup("condev=", condev_setup);
156
157static void __init set_preferred_console(void)
158{
159 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
160 add_preferred_console("ttyS", 0, NULL);
161 else if (CONSOLE_IS_3270)
162 add_preferred_console("tty3270", 0, NULL);
163 else if (CONSOLE_IS_VT220)
164 add_preferred_console("ttyS", 1, NULL);
165 else if (CONSOLE_IS_HVC)
166 add_preferred_console("hvc", 0, NULL);
167}
168
169static int __init conmode_setup(char *str)
170{
171#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
172 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
173 SET_CONSOLE_SCLP;
174#endif
175#if defined(CONFIG_TN3215_CONSOLE)
176 if (!strcmp(str, "3215"))
177 SET_CONSOLE_3215;
178#endif
179#if defined(CONFIG_TN3270_CONSOLE)
180 if (!strcmp(str, "3270"))
181 SET_CONSOLE_3270;
182#endif
183 set_preferred_console();
184 return 1;
185}
186
187__setup("conmode=", conmode_setup);
188
189static void __init conmode_default(void)
190{
191 char query_buffer[1024];
192 char *ptr;
193
194 if (MACHINE_IS_VM) {
195 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
196 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
197 ptr = strstr(query_buffer, "SUBCHANNEL =");
198 console_irq = simple_strtoul(ptr + 13, NULL, 16);
199 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
200 ptr = strstr(query_buffer, "CONMODE");
201 /*
202 * Set the conmode to 3215 so that the device recognition
203 * will set the cu_type of the console to 3215. If the
204 * conmode is 3270 and we don't set it back then both
205 * 3215 and the 3270 driver will try to access the console
206 * device (3215 as console and 3270 as normal tty).
207 */
208 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
209 if (ptr == NULL) {
210#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
211 SET_CONSOLE_SCLP;
212#endif
213 return;
214 }
215 if (str_has_prefix(ptr + 8, "3270")) {
216#if defined(CONFIG_TN3270_CONSOLE)
217 SET_CONSOLE_3270;
218#elif defined(CONFIG_TN3215_CONSOLE)
219 SET_CONSOLE_3215;
220#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
221 SET_CONSOLE_SCLP;
222#endif
223 } else if (str_has_prefix(ptr + 8, "3215")) {
224#if defined(CONFIG_TN3215_CONSOLE)
225 SET_CONSOLE_3215;
226#elif defined(CONFIG_TN3270_CONSOLE)
227 SET_CONSOLE_3270;
228#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
229 SET_CONSOLE_SCLP;
230#endif
231 }
232 } else if (MACHINE_IS_KVM) {
233 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
234 SET_CONSOLE_VT220;
235 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
236 SET_CONSOLE_SCLP;
237 else
238 SET_CONSOLE_HVC;
239 } else {
240#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
241 SET_CONSOLE_SCLP;
242#endif
243 }
244 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
245 conswitchp = &dummy_con;
246}
247
248#ifdef CONFIG_CRASH_DUMP
249static void __init setup_zfcpdump(void)
250{
251 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
252 return;
253 if (OLDMEM_BASE)
254 return;
255 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
256 console_loglevel = 2;
257}
258#else
259static inline void setup_zfcpdump(void) {}
260#endif /* CONFIG_CRASH_DUMP */
261
262 /*
263 * Reboot, halt and power_off stubs. They just call _machine_restart,
264 * _machine_halt or _machine_power_off.
265 */
266
267void machine_restart(char *command)
268{
269 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
270 /*
271 * Only unblank the console if we are called in enabled
272 * context or a bust_spinlocks cleared the way for us.
273 */
274 console_unblank();
275 _machine_restart(command);
276}
277
278void machine_halt(void)
279{
280 if (!in_interrupt() || oops_in_progress)
281 /*
282 * Only unblank the console if we are called in enabled
283 * context or a bust_spinlocks cleared the way for us.
284 */
285 console_unblank();
286 _machine_halt();
287}
288
289void machine_power_off(void)
290{
291 if (!in_interrupt() || oops_in_progress)
292 /*
293 * Only unblank the console if we are called in enabled
294 * context or a bust_spinlocks cleared the way for us.
295 */
296 console_unblank();
297 _machine_power_off();
298}
299
300/*
301 * Dummy power off function.
302 */
303void (*pm_power_off)(void) = machine_power_off;
304EXPORT_SYMBOL_GPL(pm_power_off);
305
306void *restart_stack __section(.data);
307
308unsigned long stack_alloc(void)
309{
310#ifdef CONFIG_VMAP_STACK
311 return (unsigned long)
312 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
313 VMALLOC_START, VMALLOC_END,
314 THREADINFO_GFP,
315 PAGE_KERNEL, 0, NUMA_NO_NODE,
316 __builtin_return_address(0));
317#else
318 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
319#endif
320}
321
322void stack_free(unsigned long stack)
323{
324#ifdef CONFIG_VMAP_STACK
325 vfree((void *) stack);
326#else
327 free_pages(stack, THREAD_SIZE_ORDER);
328#endif
329}
330
331int __init arch_early_irq_init(void)
332{
333 unsigned long stack;
334
335 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
336 if (!stack)
337 panic("Couldn't allocate async stack");
338 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
339 return 0;
340}
341
342static int __init async_stack_realloc(void)
343{
344 unsigned long old, new;
345
346 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
347 new = stack_alloc();
348 if (!new)
349 panic("Couldn't allocate async stack");
350 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
351 free_pages(old, THREAD_SIZE_ORDER);
352 return 0;
353}
354early_initcall(async_stack_realloc);
355
356void __init arch_call_rest_init(void)
357{
358 struct stack_frame *frame;
359 unsigned long stack;
360
361 stack = stack_alloc();
362 if (!stack)
363 panic("Couldn't allocate kernel stack");
364 current->stack = (void *) stack;
365#ifdef CONFIG_VMAP_STACK
366 current->stack_vm_area = (void *) stack;
367#endif
368 set_task_stack_end_magic(current);
369 stack += STACK_INIT_OFFSET;
370 S390_lowcore.kernel_stack = stack;
371 frame = (struct stack_frame *) stack;
372 memset(frame, 0, sizeof(*frame));
373 /* Branch to rest_init on the new stack, never returns */
374 asm volatile(
375 " la 15,0(%[_frame])\n"
376 " jg rest_init\n"
377 : : [_frame] "a" (frame));
378}
379
380static void __init setup_lowcore_dat_off(void)
381{
382 struct lowcore *lc;
383
384 /*
385 * Setup lowcore for boot cpu
386 */
387 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
388 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
389 if (!lc)
390 panic("%s: Failed to allocate %zu bytes align=%zx\n",
391 __func__, sizeof(*lc), sizeof(*lc));
392
393 lc->restart_psw.mask = PSW_KERNEL_BITS;
394 lc->restart_psw.addr = (unsigned long) restart_int_handler;
395 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
396 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
397 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
398 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
399 lc->svc_new_psw.addr = (unsigned long) system_call;
400 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
401 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
402 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
403 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
404 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
405 lc->io_new_psw.addr = (unsigned long) io_int_handler;
406 lc->clock_comparator = clock_comparator_max;
407 lc->nodat_stack = ((unsigned long) &init_thread_union)
408 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
409 lc->current_task = (unsigned long)&init_task;
410 lc->lpp = LPP_MAGIC;
411 lc->machine_flags = S390_lowcore.machine_flags;
412 lc->preempt_count = S390_lowcore.preempt_count;
413 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
414 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
415 sizeof(lc->stfle_fac_list));
416 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
417 sizeof(lc->alt_stfle_fac_list));
418 nmi_alloc_boot_cpu(lc);
419 vdso_alloc_boot_cpu(lc);
420 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
421 lc->async_enter_timer = S390_lowcore.async_enter_timer;
422 lc->exit_timer = S390_lowcore.exit_timer;
423 lc->user_timer = S390_lowcore.user_timer;
424 lc->system_timer = S390_lowcore.system_timer;
425 lc->steal_timer = S390_lowcore.steal_timer;
426 lc->last_update_timer = S390_lowcore.last_update_timer;
427 lc->last_update_clock = S390_lowcore.last_update_clock;
428
429 /*
430 * Allocate the global restart stack which is the same for
431 * all CPUs in cast *one* of them does a PSW restart.
432 */
433 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
434 if (!restart_stack)
435 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
436 __func__, THREAD_SIZE, THREAD_SIZE);
437 restart_stack += STACK_INIT_OFFSET;
438
439 /*
440 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
441 * restart data to the absolute zero lowcore. This is necessary if
442 * PSW restart is done on an offline CPU that has lowcore zero.
443 */
444 lc->restart_stack = (unsigned long) restart_stack;
445 lc->restart_fn = (unsigned long) do_restart;
446 lc->restart_data = 0;
447 lc->restart_source = -1UL;
448
449 /* Setup absolute zero lowcore */
450 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
451 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
452 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
453 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
454 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
455
456 lc->spinlock_lockval = arch_spin_lockval(0);
457 lc->spinlock_index = 0;
458 arch_spin_lock_setup(0);
459 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
460
461 set_prefix((u32)(unsigned long) lc);
462 lowcore_ptr[0] = lc;
463}
464
465static void __init setup_lowcore_dat_on(void)
466{
467 __ctl_clear_bit(0, 28);
468 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
469 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
470 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
471 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
472 __ctl_set_bit(0, 28);
473}
474
475static struct resource code_resource = {
476 .name = "Kernel code",
477 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
478};
479
480static struct resource data_resource = {
481 .name = "Kernel data",
482 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
483};
484
485static struct resource bss_resource = {
486 .name = "Kernel bss",
487 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
488};
489
490static struct resource __initdata *standard_resources[] = {
491 &code_resource,
492 &data_resource,
493 &bss_resource,
494};
495
496static void __init setup_resources(void)
497{
498 struct resource *res, *std_res, *sub_res;
499 struct memblock_region *reg;
500 int j;
501
502 code_resource.start = (unsigned long) _text;
503 code_resource.end = (unsigned long) _etext - 1;
504 data_resource.start = (unsigned long) _etext;
505 data_resource.end = (unsigned long) _edata - 1;
506 bss_resource.start = (unsigned long) __bss_start;
507 bss_resource.end = (unsigned long) __bss_stop - 1;
508
509 for_each_memblock(memory, reg) {
510 res = memblock_alloc(sizeof(*res), 8);
511 if (!res)
512 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
513 __func__, sizeof(*res), 8);
514 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
515
516 res->name = "System RAM";
517 res->start = reg->base;
518 res->end = reg->base + reg->size - 1;
519 request_resource(&iomem_resource, res);
520
521 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
522 std_res = standard_resources[j];
523 if (std_res->start < res->start ||
524 std_res->start > res->end)
525 continue;
526 if (std_res->end > res->end) {
527 sub_res = memblock_alloc(sizeof(*sub_res), 8);
528 if (!sub_res)
529 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
530 __func__, sizeof(*sub_res), 8);
531 *sub_res = *std_res;
532 sub_res->end = res->end;
533 std_res->start = res->end + 1;
534 request_resource(res, sub_res);
535 } else {
536 request_resource(res, std_res);
537 }
538 }
539 }
540#ifdef CONFIG_CRASH_DUMP
541 /*
542 * Re-add removed crash kernel memory as reserved memory. This makes
543 * sure it will be mapped with the identity mapping and struct pages
544 * will be created, so it can be resized later on.
545 * However add it later since the crash kernel resource should not be
546 * part of the System RAM resource.
547 */
548 if (crashk_res.end) {
549 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
550 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
551 insert_resource(&iomem_resource, &crashk_res);
552 }
553#endif
554}
555
556static void __init setup_memory_end(void)
557{
558 unsigned long vmax, tmp;
559
560 /* Choose kernel address space layout: 3 or 4 levels. */
561 if (IS_ENABLED(CONFIG_KASAN)) {
562 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
563 ? _REGION1_SIZE
564 : _REGION2_SIZE;
565 } else {
566 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
567 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
568 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
569 vmax = _REGION2_SIZE; /* 3-level kernel page table */
570 else
571 vmax = _REGION1_SIZE; /* 4-level kernel page table */
572 }
573
574 /* module area is at the end of the kernel address space. */
575 MODULES_END = vmax;
576 MODULES_VADDR = MODULES_END - MODULES_LEN;
577 VMALLOC_END = MODULES_VADDR;
578 VMALLOC_START = VMALLOC_END - vmalloc_size;
579
580 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
581 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
582 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
583 tmp = SECTION_ALIGN_UP(tmp);
584 tmp = VMALLOC_START - tmp * sizeof(struct page);
585 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
586 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
587 vmemmap = (struct page *) tmp;
588
589 /* Take care that memory_end is set and <= vmemmap */
590 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
591#ifdef CONFIG_KASAN
592 /* fit in kasan shadow memory region between 1:1 and vmemmap */
593 memory_end = min(memory_end, KASAN_SHADOW_START);
594 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
595#endif
596 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
597 memblock_remove(memory_end, ULONG_MAX);
598
599 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
600}
601
602#ifdef CONFIG_CRASH_DUMP
603
604/*
605 * When kdump is enabled, we have to ensure that no memory from
606 * the area [0 - crashkernel memory size] and
607 * [crashk_res.start - crashk_res.end] is set offline.
608 */
609static int kdump_mem_notifier(struct notifier_block *nb,
610 unsigned long action, void *data)
611{
612 struct memory_notify *arg = data;
613
614 if (action != MEM_GOING_OFFLINE)
615 return NOTIFY_OK;
616 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
617 return NOTIFY_BAD;
618 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
619 return NOTIFY_OK;
620 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
621 return NOTIFY_OK;
622 return NOTIFY_BAD;
623}
624
625static struct notifier_block kdump_mem_nb = {
626 .notifier_call = kdump_mem_notifier,
627};
628
629#endif
630
631/*
632 * Make sure that the area behind memory_end is protected
633 */
634static void reserve_memory_end(void)
635{
636 if (memory_end_set)
637 memblock_reserve(memory_end, ULONG_MAX);
638}
639
640/*
641 * Make sure that oldmem, where the dump is stored, is protected
642 */
643static void reserve_oldmem(void)
644{
645#ifdef CONFIG_CRASH_DUMP
646 if (OLDMEM_BASE)
647 /* Forget all memory above the running kdump system */
648 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
649#endif
650}
651
652/*
653 * Make sure that oldmem, where the dump is stored, is protected
654 */
655static void remove_oldmem(void)
656{
657#ifdef CONFIG_CRASH_DUMP
658 if (OLDMEM_BASE)
659 /* Forget all memory above the running kdump system */
660 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
661#endif
662}
663
664/*
665 * Reserve memory for kdump kernel to be loaded with kexec
666 */
667static void __init reserve_crashkernel(void)
668{
669#ifdef CONFIG_CRASH_DUMP
670 unsigned long long crash_base, crash_size;
671 phys_addr_t low, high;
672 int rc;
673
674 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
675 &crash_base);
676
677 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
678 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
679 if (rc || crash_size == 0)
680 return;
681
682 if (memblock.memory.regions[0].size < crash_size) {
683 pr_info("crashkernel reservation failed: %s\n",
684 "first memory chunk must be at least crashkernel size");
685 return;
686 }
687
688 low = crash_base ?: OLDMEM_BASE;
689 high = low + crash_size;
690 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
691 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
692 crash_base = low;
693 } else {
694 /* Find suitable area in free memory */
695 low = max_t(unsigned long, crash_size, sclp.hsa_size);
696 high = crash_base ? crash_base + crash_size : ULONG_MAX;
697
698 if (crash_base && crash_base < low) {
699 pr_info("crashkernel reservation failed: %s\n",
700 "crash_base too low");
701 return;
702 }
703 low = crash_base ?: low;
704 crash_base = memblock_find_in_range(low, high, crash_size,
705 KEXEC_CRASH_MEM_ALIGN);
706 }
707
708 if (!crash_base) {
709 pr_info("crashkernel reservation failed: %s\n",
710 "no suitable area found");
711 return;
712 }
713
714 if (register_memory_notifier(&kdump_mem_nb))
715 return;
716
717 if (!OLDMEM_BASE && MACHINE_IS_VM)
718 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
719 crashk_res.start = crash_base;
720 crashk_res.end = crash_base + crash_size - 1;
721 memblock_remove(crash_base, crash_size);
722 pr_info("Reserving %lluMB of memory at %lluMB "
723 "for crashkernel (System RAM: %luMB)\n",
724 crash_size >> 20, crash_base >> 20,
725 (unsigned long)memblock.memory.total_size >> 20);
726 os_info_crashkernel_add(crash_base, crash_size);
727#endif
728}
729
730/*
731 * Reserve the initrd from being used by memblock
732 */
733static void __init reserve_initrd(void)
734{
735#ifdef CONFIG_BLK_DEV_INITRD
736 if (!INITRD_START || !INITRD_SIZE)
737 return;
738 initrd_start = INITRD_START;
739 initrd_end = initrd_start + INITRD_SIZE;
740 memblock_reserve(INITRD_START, INITRD_SIZE);
741#endif
742}
743
744/*
745 * Reserve the memory area used to pass the certificate lists
746 */
747static void __init reserve_certificate_list(void)
748{
749 if (ipl_cert_list_addr)
750 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
751}
752
753static void __init reserve_mem_detect_info(void)
754{
755 unsigned long start, size;
756
757 get_mem_detect_reserved(&start, &size);
758 if (size)
759 memblock_reserve(start, size);
760}
761
762static void __init free_mem_detect_info(void)
763{
764 unsigned long start, size;
765
766 get_mem_detect_reserved(&start, &size);
767 if (size)
768 memblock_free(start, size);
769}
770
771static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
772{
773 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
774 start, start + size - 1);
775 memblock_add_range(&memblock.memory, start, size, 0, 0);
776 memblock_add_range(&memblock.physmem, start, size, 0, 0);
777}
778
779static const char * __init get_mem_info_source(void)
780{
781 switch (mem_detect.info_source) {
782 case MEM_DETECT_SCLP_STOR_INFO:
783 return "sclp storage info";
784 case MEM_DETECT_DIAG260:
785 return "diag260";
786 case MEM_DETECT_SCLP_READ_INFO:
787 return "sclp read info";
788 case MEM_DETECT_BIN_SEARCH:
789 return "binary search";
790 }
791 return "none";
792}
793
794static void __init memblock_add_mem_detect_info(void)
795{
796 unsigned long start, end;
797 int i;
798
799 memblock_dbg("physmem info source: %s (%hhd)\n",
800 get_mem_info_source(), mem_detect.info_source);
801 /* keep memblock lists close to the kernel */
802 memblock_set_bottom_up(true);
803 for_each_mem_detect_block(i, &start, &end)
804 memblock_physmem_add(start, end - start);
805 memblock_set_bottom_up(false);
806 memblock_dump_all();
807}
808
809/*
810 * Check for initrd being in usable memory
811 */
812static void __init check_initrd(void)
813{
814#ifdef CONFIG_BLK_DEV_INITRD
815 if (INITRD_START && INITRD_SIZE &&
816 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
817 pr_err("The initial RAM disk does not fit into the memory\n");
818 memblock_free(INITRD_START, INITRD_SIZE);
819 initrd_start = initrd_end = 0;
820 }
821#endif
822}
823
824/*
825 * Reserve memory used for lowcore/command line/kernel image.
826 */
827static void __init reserve_kernel(void)
828{
829 unsigned long start_pfn = PFN_UP(__pa(_end));
830
831 memblock_reserve(0, HEAD_END);
832 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
833 - (unsigned long)_stext);
834 memblock_reserve(__sdma, __edma - __sdma);
835}
836
837static void __init setup_memory(void)
838{
839 struct memblock_region *reg;
840
841 /*
842 * Init storage key for present memory
843 */
844 for_each_memblock(memory, reg) {
845 storage_key_init_range(reg->base, reg->base + reg->size);
846 }
847 psw_set_key(PAGE_DEFAULT_KEY);
848
849 /* Only cosmetics */
850 memblock_enforce_memory_limit(memblock_end_of_DRAM());
851}
852
853/*
854 * Setup hardware capabilities.
855 */
856static int __init setup_hwcaps(void)
857{
858 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
859 struct cpuid cpu_id;
860 int i;
861
862 /*
863 * The store facility list bits numbers as found in the principles
864 * of operation are numbered with bit 1UL<<31 as number 0 to
865 * bit 1UL<<0 as number 31.
866 * Bit 0: instructions named N3, "backported" to esa-mode
867 * Bit 2: z/Architecture mode is active
868 * Bit 7: the store-facility-list-extended facility is installed
869 * Bit 17: the message-security assist is installed
870 * Bit 19: the long-displacement facility is installed
871 * Bit 21: the extended-immediate facility is installed
872 * Bit 22: extended-translation facility 3 is installed
873 * Bit 30: extended-translation facility 3 enhancement facility
874 * These get translated to:
875 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
876 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
877 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
878 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
879 */
880 for (i = 0; i < 6; i++)
881 if (test_facility(stfl_bits[i]))
882 elf_hwcap |= 1UL << i;
883
884 if (test_facility(22) && test_facility(30))
885 elf_hwcap |= HWCAP_S390_ETF3EH;
886
887 /*
888 * Check for additional facilities with store-facility-list-extended.
889 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
890 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
891 * as stored by stfl, bits 32-xxx contain additional facilities.
892 * How many facility words are stored depends on the number of
893 * doublewords passed to the instruction. The additional facilities
894 * are:
895 * Bit 42: decimal floating point facility is installed
896 * Bit 44: perform floating point operation facility is installed
897 * translated to:
898 * HWCAP_S390_DFP bit 6 (42 && 44).
899 */
900 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
901 elf_hwcap |= HWCAP_S390_DFP;
902
903 /*
904 * Huge page support HWCAP_S390_HPAGE is bit 7.
905 */
906 if (MACHINE_HAS_EDAT1)
907 elf_hwcap |= HWCAP_S390_HPAGE;
908
909 /*
910 * 64-bit register support for 31-bit processes
911 * HWCAP_S390_HIGH_GPRS is bit 9.
912 */
913 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
914
915 /*
916 * Transactional execution support HWCAP_S390_TE is bit 10.
917 */
918 if (MACHINE_HAS_TE)
919 elf_hwcap |= HWCAP_S390_TE;
920
921 /*
922 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
923 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
924 * instead of facility bit 129.
925 */
926 if (MACHINE_HAS_VX) {
927 elf_hwcap |= HWCAP_S390_VXRS;
928 if (test_facility(134))
929 elf_hwcap |= HWCAP_S390_VXRS_EXT;
930 if (test_facility(135))
931 elf_hwcap |= HWCAP_S390_VXRS_BCD;
932 if (test_facility(148))
933 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
934 if (test_facility(152))
935 elf_hwcap |= HWCAP_S390_VXRS_PDE;
936 }
937 if (test_facility(150))
938 elf_hwcap |= HWCAP_S390_SORT;
939 if (test_facility(151))
940 elf_hwcap |= HWCAP_S390_DFLT;
941
942 /*
943 * Guarded storage support HWCAP_S390_GS is bit 12.
944 */
945 if (MACHINE_HAS_GS)
946 elf_hwcap |= HWCAP_S390_GS;
947
948 get_cpu_id(&cpu_id);
949 add_device_randomness(&cpu_id, sizeof(cpu_id));
950 switch (cpu_id.machine) {
951 case 0x2064:
952 case 0x2066:
953 default: /* Use "z900" as default for 64 bit kernels. */
954 strcpy(elf_platform, "z900");
955 break;
956 case 0x2084:
957 case 0x2086:
958 strcpy(elf_platform, "z990");
959 break;
960 case 0x2094:
961 case 0x2096:
962 strcpy(elf_platform, "z9-109");
963 break;
964 case 0x2097:
965 case 0x2098:
966 strcpy(elf_platform, "z10");
967 break;
968 case 0x2817:
969 case 0x2818:
970 strcpy(elf_platform, "z196");
971 break;
972 case 0x2827:
973 case 0x2828:
974 strcpy(elf_platform, "zEC12");
975 break;
976 case 0x2964:
977 case 0x2965:
978 strcpy(elf_platform, "z13");
979 break;
980 case 0x3906:
981 case 0x3907:
982 strcpy(elf_platform, "z14");
983 break;
984 case 0x8561:
985 case 0x8562:
986 strcpy(elf_platform, "z15");
987 break;
988 }
989
990 /*
991 * Virtualization support HWCAP_INT_SIE is bit 0.
992 */
993 if (sclp.has_sief2)
994 int_hwcap |= HWCAP_INT_SIE;
995
996 return 0;
997}
998arch_initcall(setup_hwcaps);
999
1000/*
1001 * Add system information as device randomness
1002 */
1003static void __init setup_randomness(void)
1004{
1005 struct sysinfo_3_2_2 *vmms;
1006
1007 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
1008 PAGE_SIZE);
1009 if (!vmms)
1010 panic("Failed to allocate memory for sysinfo structure\n");
1011
1012 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
1013 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
1014 memblock_free((unsigned long) vmms, PAGE_SIZE);
1015}
1016
1017/*
1018 * Find the correct size for the task_struct. This depends on
1019 * the size of the struct fpu at the end of the thread_struct
1020 * which is embedded in the task_struct.
1021 */
1022static void __init setup_task_size(void)
1023{
1024 int task_size = sizeof(struct task_struct);
1025
1026 if (!MACHINE_HAS_VX) {
1027 task_size -= sizeof(__vector128) * __NUM_VXRS;
1028 task_size += sizeof(freg_t) * __NUM_FPRS;
1029 }
1030 arch_task_struct_size = task_size;
1031}
1032
1033/*
1034 * Issue diagnose 318 to set the control program name and
1035 * version codes.
1036 */
1037static void __init setup_control_program_code(void)
1038{
1039 union diag318_info diag318_info = {
1040 .cpnc = CPNC_LINUX,
1041 .cpvc_linux = 0,
1042 .cpvc_distro = {0},
1043 };
1044
1045 if (!sclp.has_diag318)
1046 return;
1047
1048 diag_stat_inc(DIAG_STAT_X318);
1049 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1050}
1051
1052/*
1053 * Print the component list from the IPL report
1054 */
1055static void __init log_component_list(void)
1056{
1057 struct ipl_rb_component_entry *ptr, *end;
1058 char *str;
1059
1060 if (!early_ipl_comp_list_addr)
1061 return;
1062 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR)
1063 pr_info("Linux is running with Secure-IPL enabled\n");
1064 else
1065 pr_info("Linux is running with Secure-IPL disabled\n");
1066 ptr = (void *) early_ipl_comp_list_addr;
1067 end = (void *) ptr + early_ipl_comp_list_size;
1068 pr_info("The IPL report contains the following components:\n");
1069 while (ptr < end) {
1070 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1071 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1072 str = "signed, verified";
1073 else
1074 str = "signed, verification failed";
1075 } else {
1076 str = "not signed";
1077 }
1078 pr_info("%016llx - %016llx (%s)\n",
1079 ptr->addr, ptr->addr + ptr->len, str);
1080 ptr++;
1081 }
1082}
1083
1084/*
1085 * Setup function called from init/main.c just after the banner
1086 * was printed.
1087 */
1088
1089void __init setup_arch(char **cmdline_p)
1090{
1091 /*
1092 * print what head.S has found out about the machine
1093 */
1094 if (MACHINE_IS_VM)
1095 pr_info("Linux is running as a z/VM "
1096 "guest operating system in 64-bit mode\n");
1097 else if (MACHINE_IS_KVM)
1098 pr_info("Linux is running under KVM in 64-bit mode\n");
1099 else if (MACHINE_IS_LPAR)
1100 pr_info("Linux is running natively in 64-bit mode\n");
1101 else
1102 pr_info("Linux is running as a guest in 64-bit mode\n");
1103
1104 log_component_list();
1105
1106 /* Have one command line that is parsed and saved in /proc/cmdline */
1107 /* boot_command_line has been already set up in early.c */
1108 *cmdline_p = boot_command_line;
1109
1110 ROOT_DEV = Root_RAM0;
1111
1112 init_mm.start_code = (unsigned long) _text;
1113 init_mm.end_code = (unsigned long) _etext;
1114 init_mm.end_data = (unsigned long) _edata;
1115 init_mm.brk = (unsigned long) _end;
1116
1117 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1118 nospec_auto_detect();
1119
1120 parse_early_param();
1121#ifdef CONFIG_CRASH_DUMP
1122 /* Deactivate elfcorehdr= kernel parameter */
1123 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1124#endif
1125
1126 os_info_init();
1127 setup_ipl();
1128 setup_task_size();
1129 setup_control_program_code();
1130
1131 /* Do some memory reservations *before* memory is added to memblock */
1132 reserve_memory_end();
1133 reserve_oldmem();
1134 reserve_kernel();
1135 reserve_initrd();
1136 reserve_certificate_list();
1137 reserve_mem_detect_info();
1138 memblock_allow_resize();
1139
1140 /* Get information about *all* installed memory */
1141 memblock_add_mem_detect_info();
1142
1143 free_mem_detect_info();
1144 remove_oldmem();
1145
1146 /*
1147 * Make sure all chunks are MAX_ORDER aligned so we don't need the
1148 * extra checks that HOLES_IN_ZONE would require.
1149 *
1150 * Is this still required?
1151 */
1152 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
1153
1154 setup_memory_end();
1155 setup_memory();
1156 dma_contiguous_reserve(memory_end);
1157 vmcp_cma_reserve();
1158
1159 check_initrd();
1160 reserve_crashkernel();
1161#ifdef CONFIG_CRASH_DUMP
1162 /*
1163 * Be aware that smp_save_dump_cpus() triggers a system reset.
1164 * Therefore CPU and device initialization should be done afterwards.
1165 */
1166 smp_save_dump_cpus();
1167#endif
1168
1169 setup_resources();
1170 setup_lowcore_dat_off();
1171 smp_fill_possible_mask();
1172 cpu_detect_mhz_feature();
1173 cpu_init();
1174 numa_setup();
1175 smp_detect_cpus();
1176 topology_init_early();
1177
1178 /*
1179 * Create kernel page tables and switch to virtual addressing.
1180 */
1181 paging_init();
1182
1183 /*
1184 * After paging_init created the kernel page table, the new PSWs
1185 * in lowcore can now run with DAT enabled.
1186 */
1187 setup_lowcore_dat_on();
1188
1189 /* Setup default console */
1190 conmode_default();
1191 set_preferred_console();
1192
1193 apply_alternative_instructions();
1194 if (IS_ENABLED(CONFIG_EXPOLINE))
1195 nospec_init_branches();
1196
1197 /* Setup zfcpdump support */
1198 setup_zfcpdump();
1199
1200 /* Add system specific data to the random pool */
1201 setup_randomness();
1202}