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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-map-ops.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52#include <linux/hugetlb.h>
53#include <linux/kmemleak.h>
54
55#include <asm/archrandom.h>
56#include <asm/boot_data.h>
57#include <asm/ipl.h>
58#include <asm/facility.h>
59#include <asm/smp.h>
60#include <asm/mmu_context.h>
61#include <asm/cpcmd.h>
62#include <asm/abs_lowcore.h>
63#include <asm/nmi.h>
64#include <asm/irq.h>
65#include <asm/page.h>
66#include <asm/ptrace.h>
67#include <asm/sections.h>
68#include <asm/ebcdic.h>
69#include <asm/diag.h>
70#include <asm/os_info.h>
71#include <asm/sclp.h>
72#include <asm/stacktrace.h>
73#include <asm/sysinfo.h>
74#include <asm/numa.h>
75#include <asm/alternative.h>
76#include <asm/nospec-branch.h>
77#include <asm/physmem_info.h>
78#include <asm/maccess.h>
79#include <asm/uv.h>
80#include <asm/asm-offsets.h>
81#include "entry.h"
82
83/*
84 * Machine setup..
85 */
86unsigned int console_mode = 0;
87EXPORT_SYMBOL(console_mode);
88
89unsigned int console_devno = -1;
90EXPORT_SYMBOL(console_devno);
91
92unsigned int console_irq = -1;
93EXPORT_SYMBOL(console_irq);
94
95/*
96 * Some code and data needs to stay below 2 GB, even when the kernel would be
97 * relocated above 2 GB, because it has to use 31 bit addresses.
98 * Such code and data is part of the .amode31 section.
99 */
100char __amode31_ref *__samode31 = _samode31;
101char __amode31_ref *__eamode31 = _eamode31;
102char __amode31_ref *__stext_amode31 = _stext_amode31;
103char __amode31_ref *__etext_amode31 = _etext_amode31;
104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
106
107/*
108 * Control registers CR2, CR5 and CR15 are initialized with addresses
109 * of tables that must be placed below 2G which is handled by the AMODE31
110 * sections.
111 * Because the AMODE31 sections are relocated below 2G at startup,
112 * the content of control registers CR2, CR5 and CR15 must be updated
113 * with new addresses after the relocation. The initial initialization of
114 * control registers occurs in head64.S and then gets updated again after AMODE31
115 * relocation. We must access the relevant AMODE31 tables indirectly via
116 * pointers placed in the .amode31.refs linker section. Those pointers get
117 * updated automatically during AMODE31 relocation and always contain a valid
118 * address within AMODE31 sections.
119 */
120
121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125};
126
127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
128 0x80000000, 0, 0, 0,
129 0x80000000, 0, 0, 0,
130 0x80000000, 0, 0, 0,
131 0x80000000, 0, 0, 0,
132 0x80000000, 0, 0, 0,
133 0x80000000, 0, 0, 0,
134 0x80000000, 0, 0, 0,
135 0x80000000, 0, 0, 0
136};
137
138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141};
142
143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148unsigned long __bootdata_preserved(max_mappable);
149unsigned long __bootdata(ident_map_size);
150struct physmem_info __bootdata(physmem_info);
151
152unsigned long __bootdata_preserved(__kaslr_offset);
153int __bootdata_preserved(__kaslr_enabled);
154unsigned int __bootdata_preserved(zlib_dfltcc_support);
155EXPORT_SYMBOL(zlib_dfltcc_support);
156u64 __bootdata_preserved(stfle_fac_list[16]);
157EXPORT_SYMBOL(stfle_fac_list);
158u64 __bootdata_preserved(alt_stfle_fac_list[16]);
159struct oldmem_data __bootdata_preserved(oldmem_data);
160
161unsigned long VMALLOC_START;
162EXPORT_SYMBOL(VMALLOC_START);
163
164unsigned long VMALLOC_END;
165EXPORT_SYMBOL(VMALLOC_END);
166
167struct page *vmemmap;
168EXPORT_SYMBOL(vmemmap);
169unsigned long vmemmap_size;
170
171unsigned long MODULES_VADDR;
172unsigned long MODULES_END;
173
174/* An array with a pointer to the lowcore of every CPU. */
175struct lowcore *lowcore_ptr[NR_CPUS];
176EXPORT_SYMBOL(lowcore_ptr);
177
178DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
179
180/*
181 * The Write Back bit position in the physaddr is given by the SLPC PCI.
182 * Leaving the mask zero always uses write through which is safe
183 */
184unsigned long mio_wb_bit_mask __ro_after_init;
185
186/*
187 * This is set up by the setup-routine at boot-time
188 * for S390 need to find out, what we have to setup
189 * using address 0x10400 ...
190 */
191
192#include <asm/setup.h>
193
194/*
195 * condev= and conmode= setup parameter.
196 */
197
198static int __init condev_setup(char *str)
199{
200 int vdev;
201
202 vdev = simple_strtoul(str, &str, 0);
203 if (vdev >= 0 && vdev < 65536) {
204 console_devno = vdev;
205 console_irq = -1;
206 }
207 return 1;
208}
209
210__setup("condev=", condev_setup);
211
212static void __init set_preferred_console(void)
213{
214 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
215 add_preferred_console("ttyS", 0, NULL);
216 else if (CONSOLE_IS_3270)
217 add_preferred_console("tty3270", 0, NULL);
218 else if (CONSOLE_IS_VT220)
219 add_preferred_console("ttysclp", 0, NULL);
220 else if (CONSOLE_IS_HVC)
221 add_preferred_console("hvc", 0, NULL);
222}
223
224static int __init conmode_setup(char *str)
225{
226#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
227 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
228 SET_CONSOLE_SCLP;
229#endif
230#if defined(CONFIG_TN3215_CONSOLE)
231 if (!strcmp(str, "3215"))
232 SET_CONSOLE_3215;
233#endif
234#if defined(CONFIG_TN3270_CONSOLE)
235 if (!strcmp(str, "3270"))
236 SET_CONSOLE_3270;
237#endif
238 set_preferred_console();
239 return 1;
240}
241
242__setup("conmode=", conmode_setup);
243
244static void __init conmode_default(void)
245{
246 char query_buffer[1024];
247 char *ptr;
248
249 if (MACHINE_IS_VM) {
250 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
251 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
252 ptr = strstr(query_buffer, "SUBCHANNEL =");
253 console_irq = simple_strtoul(ptr + 13, NULL, 16);
254 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
255 ptr = strstr(query_buffer, "CONMODE");
256 /*
257 * Set the conmode to 3215 so that the device recognition
258 * will set the cu_type of the console to 3215. If the
259 * conmode is 3270 and we don't set it back then both
260 * 3215 and the 3270 driver will try to access the console
261 * device (3215 as console and 3270 as normal tty).
262 */
263 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
264 if (ptr == NULL) {
265#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
266 SET_CONSOLE_SCLP;
267#endif
268 return;
269 }
270 if (str_has_prefix(ptr + 8, "3270")) {
271#if defined(CONFIG_TN3270_CONSOLE)
272 SET_CONSOLE_3270;
273#elif defined(CONFIG_TN3215_CONSOLE)
274 SET_CONSOLE_3215;
275#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
276 SET_CONSOLE_SCLP;
277#endif
278 } else if (str_has_prefix(ptr + 8, "3215")) {
279#if defined(CONFIG_TN3215_CONSOLE)
280 SET_CONSOLE_3215;
281#elif defined(CONFIG_TN3270_CONSOLE)
282 SET_CONSOLE_3270;
283#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
284 SET_CONSOLE_SCLP;
285#endif
286 }
287 } else if (MACHINE_IS_KVM) {
288 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
289 SET_CONSOLE_VT220;
290 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
291 SET_CONSOLE_SCLP;
292 else
293 SET_CONSOLE_HVC;
294 } else {
295#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
296 SET_CONSOLE_SCLP;
297#endif
298 }
299}
300
301#ifdef CONFIG_CRASH_DUMP
302static void __init setup_zfcpdump(void)
303{
304 if (!is_ipl_type_dump())
305 return;
306 if (oldmem_data.start)
307 return;
308 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
309 console_loglevel = 2;
310}
311#else
312static inline void setup_zfcpdump(void) {}
313#endif /* CONFIG_CRASH_DUMP */
314
315 /*
316 * Reboot, halt and power_off stubs. They just call _machine_restart,
317 * _machine_halt or _machine_power_off.
318 */
319
320void machine_restart(char *command)
321{
322 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
323 /*
324 * Only unblank the console if we are called in enabled
325 * context or a bust_spinlocks cleared the way for us.
326 */
327 console_unblank();
328 _machine_restart(command);
329}
330
331void machine_halt(void)
332{
333 if (!in_interrupt() || oops_in_progress)
334 /*
335 * Only unblank the console if we are called in enabled
336 * context or a bust_spinlocks cleared the way for us.
337 */
338 console_unblank();
339 _machine_halt();
340}
341
342void machine_power_off(void)
343{
344 if (!in_interrupt() || oops_in_progress)
345 /*
346 * Only unblank the console if we are called in enabled
347 * context or a bust_spinlocks cleared the way for us.
348 */
349 console_unblank();
350 _machine_power_off();
351}
352
353/*
354 * Dummy power off function.
355 */
356void (*pm_power_off)(void) = machine_power_off;
357EXPORT_SYMBOL_GPL(pm_power_off);
358
359void *restart_stack;
360
361unsigned long stack_alloc(void)
362{
363#ifdef CONFIG_VMAP_STACK
364 void *ret;
365
366 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
367 NUMA_NO_NODE, __builtin_return_address(0));
368 kmemleak_not_leak(ret);
369 return (unsigned long)ret;
370#else
371 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
372#endif
373}
374
375void stack_free(unsigned long stack)
376{
377#ifdef CONFIG_VMAP_STACK
378 vfree((void *) stack);
379#else
380 free_pages(stack, THREAD_SIZE_ORDER);
381#endif
382}
383
384static unsigned long __init stack_alloc_early(void)
385{
386 unsigned long stack;
387
388 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
389 if (!stack) {
390 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
391 __func__, THREAD_SIZE, THREAD_SIZE);
392 }
393 return stack;
394}
395
396static void __init setup_lowcore(void)
397{
398 struct lowcore *lc, *abs_lc;
399
400 /*
401 * Setup lowcore for boot cpu
402 */
403 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
404 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
405 if (!lc)
406 panic("%s: Failed to allocate %zu bytes align=%zx\n",
407 __func__, sizeof(*lc), sizeof(*lc));
408
409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
410 lc->restart_psw.addr = __pa(restart_int_handler);
411 lc->external_new_psw.mask = PSW_KERNEL_BITS;
412 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
413 lc->svc_new_psw.mask = PSW_KERNEL_BITS;
414 lc->svc_new_psw.addr = (unsigned long) system_call;
415 lc->program_new_psw.mask = PSW_KERNEL_BITS;
416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
419 lc->io_new_psw.mask = PSW_KERNEL_BITS;
420 lc->io_new_psw.addr = (unsigned long) io_int_handler;
421 lc->clock_comparator = clock_comparator_max;
422 lc->current_task = (unsigned long)&init_task;
423 lc->lpp = LPP_MAGIC;
424 lc->machine_flags = S390_lowcore.machine_flags;
425 lc->preempt_count = S390_lowcore.preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
428 lc->exit_timer = S390_lowcore.exit_timer;
429 lc->user_timer = S390_lowcore.user_timer;
430 lc->system_timer = S390_lowcore.system_timer;
431 lc->steal_timer = S390_lowcore.steal_timer;
432 lc->last_update_timer = S390_lowcore.last_update_timer;
433 lc->last_update_clock = S390_lowcore.last_update_clock;
434 /*
435 * Allocate the global restart stack which is the same for
436 * all CPUs in case *one* of them does a PSW restart.
437 */
438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
442 lc->kernel_stack = S390_lowcore.kernel_stack;
443 /*
444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
445 * restart data to the absolute zero lowcore. This is necessary if
446 * PSW restart is done on an offline CPU that has lowcore zero.
447 */
448 lc->restart_stack = (unsigned long) restart_stack;
449 lc->restart_fn = (unsigned long) do_restart;
450 lc->restart_data = 0;
451 lc->restart_source = -1U;
452 lc->spinlock_lockval = arch_spin_lockval(0);
453 lc->spinlock_index = 0;
454 arch_spin_lock_setup(0);
455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
457 lc->preempt_count = PREEMPT_DISABLED;
458 lc->kernel_asce = S390_lowcore.kernel_asce;
459 lc->user_asce = S390_lowcore.user_asce;
460
461 system_ctlreg_init_save_area(lc);
462 abs_lc = get_abs_lowcore();
463 abs_lc->restart_stack = lc->restart_stack;
464 abs_lc->restart_fn = lc->restart_fn;
465 abs_lc->restart_data = lc->restart_data;
466 abs_lc->restart_source = lc->restart_source;
467 abs_lc->restart_psw = lc->restart_psw;
468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
469 abs_lc->program_new_psw = lc->program_new_psw;
470 abs_lc->mcesad = lc->mcesad;
471 put_abs_lowcore(abs_lc);
472
473 set_prefix(__pa(lc));
474 lowcore_ptr[0] = lc;
475 if (abs_lowcore_map(0, lowcore_ptr[0], false))
476 panic("Couldn't setup absolute lowcore");
477}
478
479static struct resource code_resource = {
480 .name = "Kernel code",
481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
482};
483
484static struct resource data_resource = {
485 .name = "Kernel data",
486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
487};
488
489static struct resource bss_resource = {
490 .name = "Kernel bss",
491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
492};
493
494static struct resource __initdata *standard_resources[] = {
495 &code_resource,
496 &data_resource,
497 &bss_resource,
498};
499
500static void __init setup_resources(void)
501{
502 struct resource *res, *std_res, *sub_res;
503 phys_addr_t start, end;
504 int j;
505 u64 i;
506
507 code_resource.start = (unsigned long) _text;
508 code_resource.end = (unsigned long) _etext - 1;
509 data_resource.start = (unsigned long) _etext;
510 data_resource.end = (unsigned long) _edata - 1;
511 bss_resource.start = (unsigned long) __bss_start;
512 bss_resource.end = (unsigned long) __bss_stop - 1;
513
514 for_each_mem_range(i, &start, &end) {
515 res = memblock_alloc(sizeof(*res), 8);
516 if (!res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*res), 8);
519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
520
521 res->name = "System RAM";
522 res->start = start;
523 /*
524 * In memblock, end points to the first byte after the
525 * range while in resources, end points to the last byte in
526 * the range.
527 */
528 res->end = end - 1;
529 request_resource(&iomem_resource, res);
530
531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
532 std_res = standard_resources[j];
533 if (std_res->start < res->start ||
534 std_res->start > res->end)
535 continue;
536 if (std_res->end > res->end) {
537 sub_res = memblock_alloc(sizeof(*sub_res), 8);
538 if (!sub_res)
539 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
540 __func__, sizeof(*sub_res), 8);
541 *sub_res = *std_res;
542 sub_res->end = res->end;
543 std_res->start = res->end + 1;
544 request_resource(res, sub_res);
545 } else {
546 request_resource(res, std_res);
547 }
548 }
549 }
550#ifdef CONFIG_CRASH_DUMP
551 /*
552 * Re-add removed crash kernel memory as reserved memory. This makes
553 * sure it will be mapped with the identity mapping and struct pages
554 * will be created, so it can be resized later on.
555 * However add it later since the crash kernel resource should not be
556 * part of the System RAM resource.
557 */
558 if (crashk_res.end) {
559 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
560 0, MEMBLOCK_NONE);
561 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
562 insert_resource(&iomem_resource, &crashk_res);
563 }
564#endif
565}
566
567static void __init setup_memory_end(void)
568{
569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
571}
572
573#ifdef CONFIG_CRASH_DUMP
574
575/*
576 * When kdump is enabled, we have to ensure that no memory from the area
577 * [0 - crashkernel memory size] is set offline - it will be exchanged with
578 * the crashkernel memory region when kdump is triggered. The crashkernel
579 * memory region can never get offlined (pages are unmovable).
580 */
581static int kdump_mem_notifier(struct notifier_block *nb,
582 unsigned long action, void *data)
583{
584 struct memory_notify *arg = data;
585
586 if (action != MEM_GOING_OFFLINE)
587 return NOTIFY_OK;
588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
589 return NOTIFY_BAD;
590 return NOTIFY_OK;
591}
592
593static struct notifier_block kdump_mem_nb = {
594 .notifier_call = kdump_mem_notifier,
595};
596
597#endif
598
599/*
600 * Reserve page tables created by decompressor
601 */
602static void __init reserve_pgtables(void)
603{
604 unsigned long start, end;
605 struct reserved_range *range;
606
607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
608 memblock_reserve(start, end - start);
609}
610
611/*
612 * Reserve memory for kdump kernel to be loaded with kexec
613 */
614static void __init reserve_crashkernel(void)
615{
616#ifdef CONFIG_CRASH_DUMP
617 unsigned long long crash_base, crash_size;
618 phys_addr_t low, high;
619 int rc;
620
621 rc = parse_crashkernel(boot_command_line, ident_map_size,
622 &crash_size, &crash_base, NULL, NULL);
623
624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
626 if (rc || crash_size == 0)
627 return;
628
629 if (memblock.memory.regions[0].size < crash_size) {
630 pr_info("crashkernel reservation failed: %s\n",
631 "first memory chunk must be at least crashkernel size");
632 return;
633 }
634
635 low = crash_base ?: oldmem_data.start;
636 high = low + crash_size;
637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
639 crash_base = low;
640 } else {
641 /* Find suitable area in free memory */
642 low = max_t(unsigned long, crash_size, sclp.hsa_size);
643 high = crash_base ? crash_base + crash_size : ULONG_MAX;
644
645 if (crash_base && crash_base < low) {
646 pr_info("crashkernel reservation failed: %s\n",
647 "crash_base too low");
648 return;
649 }
650 low = crash_base ?: low;
651 crash_base = memblock_phys_alloc_range(crash_size,
652 KEXEC_CRASH_MEM_ALIGN,
653 low, high);
654 }
655
656 if (!crash_base) {
657 pr_info("crashkernel reservation failed: %s\n",
658 "no suitable area found");
659 return;
660 }
661
662 if (register_memory_notifier(&kdump_mem_nb)) {
663 memblock_phys_free(crash_base, crash_size);
664 return;
665 }
666
667 if (!oldmem_data.start && MACHINE_IS_VM)
668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
669 crashk_res.start = crash_base;
670 crashk_res.end = crash_base + crash_size - 1;
671 memblock_remove(crash_base, crash_size);
672 pr_info("Reserving %lluMB of memory at %lluMB "
673 "for crashkernel (System RAM: %luMB)\n",
674 crash_size >> 20, crash_base >> 20,
675 (unsigned long)memblock.memory.total_size >> 20);
676 os_info_crashkernel_add(crash_base, crash_size);
677#endif
678}
679
680/*
681 * Reserve the initrd from being used by memblock
682 */
683static void __init reserve_initrd(void)
684{
685 unsigned long addr, size;
686
687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
688 return;
689 initrd_start = (unsigned long)__va(addr);
690 initrd_end = initrd_start + size;
691 memblock_reserve(addr, size);
692}
693
694/*
695 * Reserve the memory area used to pass the certificate lists
696 */
697static void __init reserve_certificate_list(void)
698{
699 if (ipl_cert_list_addr)
700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
701}
702
703static void __init reserve_physmem_info(void)
704{
705 unsigned long addr, size;
706
707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
708 memblock_reserve(addr, size);
709}
710
711static void __init free_physmem_info(void)
712{
713 unsigned long addr, size;
714
715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
716 memblock_phys_free(addr, size);
717}
718
719static void __init memblock_add_physmem_info(void)
720{
721 unsigned long start, end;
722 int i;
723
724 pr_debug("physmem info source: %s (%hhd)\n",
725 get_physmem_info_source(), physmem_info.info_source);
726 /* keep memblock lists close to the kernel */
727 memblock_set_bottom_up(true);
728 for_each_physmem_usable_range(i, &start, &end)
729 memblock_add(start, end - start);
730 for_each_physmem_online_range(i, &start, &end)
731 memblock_physmem_add(start, end - start);
732 memblock_set_bottom_up(false);
733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
734}
735
736/*
737 * Reserve memory used for lowcore/command line/kernel image.
738 */
739static void __init reserve_kernel(void)
740{
741 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
742 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
743 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
744 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
745 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
746 memblock_reserve(__pa(_stext), _end - _stext);
747}
748
749static void __init setup_memory(void)
750{
751 phys_addr_t start, end;
752 u64 i;
753
754 /*
755 * Init storage key for present memory
756 */
757 for_each_mem_range(i, &start, &end)
758 storage_key_init_range(start, end);
759
760 psw_set_key(PAGE_DEFAULT_KEY);
761}
762
763static void __init relocate_amode31_section(void)
764{
765 unsigned long amode31_size = __eamode31 - __samode31;
766 long amode31_offset, *ptr;
767
768 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31;
769 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
770
771 /* Move original AMODE31 section to the new one */
772 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
773 /* Zero out the old AMODE31 section to catch invalid accesses within it */
774 memset(__samode31, 0, amode31_size);
775
776 /* Update all AMODE31 region references */
777 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
778 *ptr += amode31_offset;
779}
780
781/* This must be called after AMODE31 relocation */
782static void __init setup_cr(void)
783{
784 union ctlreg2 cr2;
785 union ctlreg5 cr5;
786 union ctlreg15 cr15;
787
788 __ctl_duct[1] = (unsigned long)__ctl_aste;
789 __ctl_duct[2] = (unsigned long)__ctl_aste;
790 __ctl_duct[4] = (unsigned long)__ctl_duald;
791
792 /* Update control registers CR2, CR5 and CR15 */
793 local_ctl_store(2, &cr2.reg);
794 local_ctl_store(5, &cr5.reg);
795 local_ctl_store(15, &cr15.reg);
796 cr2.ducto = (unsigned long)__ctl_duct >> 6;
797 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
798 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
799 system_ctl_load(2, &cr2.reg);
800 system_ctl_load(5, &cr5.reg);
801 system_ctl_load(15, &cr15.reg);
802}
803
804/*
805 * Add system information as device randomness
806 */
807static void __init setup_randomness(void)
808{
809 struct sysinfo_3_2_2 *vmms;
810
811 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
812 if (!vmms)
813 panic("Failed to allocate memory for sysinfo structure\n");
814 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
815 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
816 memblock_free(vmms, PAGE_SIZE);
817
818 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
819 static_branch_enable(&s390_arch_random_available);
820}
821
822/*
823 * Issue diagnose 318 to set the control program name and
824 * version codes.
825 */
826static void __init setup_control_program_code(void)
827{
828 union diag318_info diag318_info = {
829 .cpnc = CPNC_LINUX,
830 .cpvc = 0,
831 };
832
833 if (!sclp.has_diag318)
834 return;
835
836 diag_stat_inc(DIAG_STAT_X318);
837 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
838}
839
840/*
841 * Print the component list from the IPL report
842 */
843static void __init log_component_list(void)
844{
845 struct ipl_rb_component_entry *ptr, *end;
846 char *str;
847
848 if (!early_ipl_comp_list_addr)
849 return;
850 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
851 pr_info("Linux is running with Secure-IPL enabled\n");
852 else
853 pr_info("Linux is running with Secure-IPL disabled\n");
854 ptr = __va(early_ipl_comp_list_addr);
855 end = (void *) ptr + early_ipl_comp_list_size;
856 pr_info("The IPL report contains the following components:\n");
857 while (ptr < end) {
858 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
859 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
860 str = "signed, verified";
861 else
862 str = "signed, verification failed";
863 } else {
864 str = "not signed";
865 }
866 pr_info("%016llx - %016llx (%s)\n",
867 ptr->addr, ptr->addr + ptr->len, str);
868 ptr++;
869 }
870}
871
872/*
873 * Setup function called from init/main.c just after the banner
874 * was printed.
875 */
876
877void __init setup_arch(char **cmdline_p)
878{
879 /*
880 * print what head.S has found out about the machine
881 */
882 if (MACHINE_IS_VM)
883 pr_info("Linux is running as a z/VM "
884 "guest operating system in 64-bit mode\n");
885 else if (MACHINE_IS_KVM)
886 pr_info("Linux is running under KVM in 64-bit mode\n");
887 else if (MACHINE_IS_LPAR)
888 pr_info("Linux is running natively in 64-bit mode\n");
889 else
890 pr_info("Linux is running as a guest in 64-bit mode\n");
891
892 log_component_list();
893
894 /* Have one command line that is parsed and saved in /proc/cmdline */
895 /* boot_command_line has been already set up in early.c */
896 *cmdline_p = boot_command_line;
897
898 ROOT_DEV = Root_RAM0;
899
900 setup_initial_init_mm(_text, _etext, _edata, _end);
901
902 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
903 nospec_auto_detect();
904
905 jump_label_init();
906 parse_early_param();
907#ifdef CONFIG_CRASH_DUMP
908 /* Deactivate elfcorehdr= kernel parameter */
909 elfcorehdr_addr = ELFCORE_ADDR_MAX;
910#endif
911
912 os_info_init();
913 setup_ipl();
914 setup_control_program_code();
915
916 /* Do some memory reservations *before* memory is added to memblock */
917 reserve_pgtables();
918 reserve_kernel();
919 reserve_initrd();
920 reserve_certificate_list();
921 reserve_physmem_info();
922 memblock_set_current_limit(ident_map_size);
923 memblock_allow_resize();
924
925 /* Get information about *all* installed memory */
926 memblock_add_physmem_info();
927
928 free_physmem_info();
929 setup_memory_end();
930 memblock_dump_all();
931 setup_memory();
932
933 relocate_amode31_section();
934 setup_cr();
935 setup_uv();
936 dma_contiguous_reserve(ident_map_size);
937 vmcp_cma_reserve();
938 if (MACHINE_HAS_EDAT2)
939 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
940
941 reserve_crashkernel();
942#ifdef CONFIG_CRASH_DUMP
943 /*
944 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
945 * Therefore CPU and device initialization should be done afterwards.
946 */
947 smp_save_dump_secondary_cpus();
948#endif
949
950 setup_resources();
951 setup_lowcore();
952 smp_fill_possible_mask();
953 cpu_detect_mhz_feature();
954 cpu_init();
955 numa_setup();
956 smp_detect_cpus();
957 topology_init_early();
958
959 if (test_facility(193))
960 static_branch_enable(&cpu_has_bear);
961
962 /*
963 * Create kernel page tables.
964 */
965 paging_init();
966
967 /*
968 * After paging_init created the kernel page table, the new PSWs
969 * in lowcore can now run with DAT enabled.
970 */
971#ifdef CONFIG_CRASH_DUMP
972 smp_save_dump_ipl_cpu();
973#endif
974
975 /* Setup default console */
976 conmode_default();
977 set_preferred_console();
978
979 apply_alternative_instructions();
980 if (IS_ENABLED(CONFIG_EXPOLINE))
981 nospec_init_branches();
982
983 /* Setup zfcp/nvme dump support */
984 setup_zfcpdump();
985
986 /* Add system specific data to the random pool */
987 setup_randomness();
988}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-contiguous.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52
53#include <asm/boot_data.h>
54#include <asm/ipl.h>
55#include <asm/facility.h>
56#include <asm/smp.h>
57#include <asm/mmu_context.h>
58#include <asm/cpcmd.h>
59#include <asm/lowcore.h>
60#include <asm/nmi.h>
61#include <asm/irq.h>
62#include <asm/page.h>
63#include <asm/ptrace.h>
64#include <asm/sections.h>
65#include <asm/ebcdic.h>
66#include <asm/diag.h>
67#include <asm/os_info.h>
68#include <asm/sclp.h>
69#include <asm/stacktrace.h>
70#include <asm/sysinfo.h>
71#include <asm/numa.h>
72#include <asm/alternative.h>
73#include <asm/nospec-branch.h>
74#include <asm/mem_detect.h>
75#include <asm/uv.h>
76#include <asm/asm-offsets.h>
77#include "entry.h"
78
79/*
80 * Machine setup..
81 */
82unsigned int console_mode = 0;
83EXPORT_SYMBOL(console_mode);
84
85unsigned int console_devno = -1;
86EXPORT_SYMBOL(console_devno);
87
88unsigned int console_irq = -1;
89EXPORT_SYMBOL(console_irq);
90
91unsigned long elf_hwcap __read_mostly = 0;
92char elf_platform[ELF_PLATFORM_SIZE];
93
94unsigned long int_hwcap = 0;
95
96int __bootdata(noexec_disabled);
97int __bootdata(memory_end_set);
98unsigned long __bootdata(memory_end);
99unsigned long __bootdata(vmalloc_size);
100unsigned long __bootdata(max_physmem_end);
101struct mem_detect_info __bootdata(mem_detect);
102
103struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
104struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
105unsigned long __bootdata_preserved(__swsusp_reset_dma);
106unsigned long __bootdata_preserved(__stext_dma);
107unsigned long __bootdata_preserved(__etext_dma);
108unsigned long __bootdata_preserved(__sdma);
109unsigned long __bootdata_preserved(__edma);
110unsigned long __bootdata_preserved(__kaslr_offset);
111unsigned int __bootdata_preserved(zlib_dfltcc_support);
112EXPORT_SYMBOL(zlib_dfltcc_support);
113
114unsigned long VMALLOC_START;
115EXPORT_SYMBOL(VMALLOC_START);
116
117unsigned long VMALLOC_END;
118EXPORT_SYMBOL(VMALLOC_END);
119
120struct page *vmemmap;
121EXPORT_SYMBOL(vmemmap);
122
123unsigned long MODULES_VADDR;
124unsigned long MODULES_END;
125
126/* An array with a pointer to the lowcore of every CPU. */
127struct lowcore *lowcore_ptr[NR_CPUS];
128EXPORT_SYMBOL(lowcore_ptr);
129
130/*
131 * This is set up by the setup-routine at boot-time
132 * for S390 need to find out, what we have to setup
133 * using address 0x10400 ...
134 */
135
136#include <asm/setup.h>
137
138/*
139 * condev= and conmode= setup parameter.
140 */
141
142static int __init condev_setup(char *str)
143{
144 int vdev;
145
146 vdev = simple_strtoul(str, &str, 0);
147 if (vdev >= 0 && vdev < 65536) {
148 console_devno = vdev;
149 console_irq = -1;
150 }
151 return 1;
152}
153
154__setup("condev=", condev_setup);
155
156static void __init set_preferred_console(void)
157{
158 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
159 add_preferred_console("ttyS", 0, NULL);
160 else if (CONSOLE_IS_3270)
161 add_preferred_console("tty3270", 0, NULL);
162 else if (CONSOLE_IS_VT220)
163 add_preferred_console("ttyS", 1, NULL);
164 else if (CONSOLE_IS_HVC)
165 add_preferred_console("hvc", 0, NULL);
166}
167
168static int __init conmode_setup(char *str)
169{
170#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
171 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
172 SET_CONSOLE_SCLP;
173#endif
174#if defined(CONFIG_TN3215_CONSOLE)
175 if (!strcmp(str, "3215"))
176 SET_CONSOLE_3215;
177#endif
178#if defined(CONFIG_TN3270_CONSOLE)
179 if (!strcmp(str, "3270"))
180 SET_CONSOLE_3270;
181#endif
182 set_preferred_console();
183 return 1;
184}
185
186__setup("conmode=", conmode_setup);
187
188static void __init conmode_default(void)
189{
190 char query_buffer[1024];
191 char *ptr;
192
193 if (MACHINE_IS_VM) {
194 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
196 ptr = strstr(query_buffer, "SUBCHANNEL =");
197 console_irq = simple_strtoul(ptr + 13, NULL, 16);
198 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
199 ptr = strstr(query_buffer, "CONMODE");
200 /*
201 * Set the conmode to 3215 so that the device recognition
202 * will set the cu_type of the console to 3215. If the
203 * conmode is 3270 and we don't set it back then both
204 * 3215 and the 3270 driver will try to access the console
205 * device (3215 as console and 3270 as normal tty).
206 */
207 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
208 if (ptr == NULL) {
209#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 SET_CONSOLE_SCLP;
211#endif
212 return;
213 }
214 if (str_has_prefix(ptr + 8, "3270")) {
215#if defined(CONFIG_TN3270_CONSOLE)
216 SET_CONSOLE_3270;
217#elif defined(CONFIG_TN3215_CONSOLE)
218 SET_CONSOLE_3215;
219#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
220 SET_CONSOLE_SCLP;
221#endif
222 } else if (str_has_prefix(ptr + 8, "3215")) {
223#if defined(CONFIG_TN3215_CONSOLE)
224 SET_CONSOLE_3215;
225#elif defined(CONFIG_TN3270_CONSOLE)
226 SET_CONSOLE_3270;
227#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 }
231 } else if (MACHINE_IS_KVM) {
232 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
233 SET_CONSOLE_VT220;
234 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
235 SET_CONSOLE_SCLP;
236 else
237 SET_CONSOLE_HVC;
238 } else {
239#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
240 SET_CONSOLE_SCLP;
241#endif
242 }
243}
244
245#ifdef CONFIG_CRASH_DUMP
246static void __init setup_zfcpdump(void)
247{
248 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
249 return;
250 if (OLDMEM_BASE)
251 return;
252 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
253 console_loglevel = 2;
254}
255#else
256static inline void setup_zfcpdump(void) {}
257#endif /* CONFIG_CRASH_DUMP */
258
259 /*
260 * Reboot, halt and power_off stubs. They just call _machine_restart,
261 * _machine_halt or _machine_power_off.
262 */
263
264void machine_restart(char *command)
265{
266 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
267 /*
268 * Only unblank the console if we are called in enabled
269 * context or a bust_spinlocks cleared the way for us.
270 */
271 console_unblank();
272 _machine_restart(command);
273}
274
275void machine_halt(void)
276{
277 if (!in_interrupt() || oops_in_progress)
278 /*
279 * Only unblank the console if we are called in enabled
280 * context or a bust_spinlocks cleared the way for us.
281 */
282 console_unblank();
283 _machine_halt();
284}
285
286void machine_power_off(void)
287{
288 if (!in_interrupt() || oops_in_progress)
289 /*
290 * Only unblank the console if we are called in enabled
291 * context or a bust_spinlocks cleared the way for us.
292 */
293 console_unblank();
294 _machine_power_off();
295}
296
297/*
298 * Dummy power off function.
299 */
300void (*pm_power_off)(void) = machine_power_off;
301EXPORT_SYMBOL_GPL(pm_power_off);
302
303void *restart_stack __section(.data);
304
305unsigned long stack_alloc(void)
306{
307#ifdef CONFIG_VMAP_STACK
308 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE,
309 THREADINFO_GFP, NUMA_NO_NODE,
310 __builtin_return_address(0));
311#else
312 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
313#endif
314}
315
316void stack_free(unsigned long stack)
317{
318#ifdef CONFIG_VMAP_STACK
319 vfree((void *) stack);
320#else
321 free_pages(stack, THREAD_SIZE_ORDER);
322#endif
323}
324
325int __init arch_early_irq_init(void)
326{
327 unsigned long stack;
328
329 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
330 if (!stack)
331 panic("Couldn't allocate async stack");
332 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
333 return 0;
334}
335
336static int __init async_stack_realloc(void)
337{
338 unsigned long old, new;
339
340 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
341 new = stack_alloc();
342 if (!new)
343 panic("Couldn't allocate async stack");
344 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
345 free_pages(old, THREAD_SIZE_ORDER);
346 return 0;
347}
348early_initcall(async_stack_realloc);
349
350void __init arch_call_rest_init(void)
351{
352 unsigned long stack;
353
354 stack = stack_alloc();
355 if (!stack)
356 panic("Couldn't allocate kernel stack");
357 current->stack = (void *) stack;
358#ifdef CONFIG_VMAP_STACK
359 current->stack_vm_area = (void *) stack;
360#endif
361 set_task_stack_end_magic(current);
362 stack += STACK_INIT_OFFSET;
363 S390_lowcore.kernel_stack = stack;
364 CALL_ON_STACK_NORETURN(rest_init, stack);
365}
366
367static void __init setup_lowcore_dat_off(void)
368{
369 struct lowcore *lc;
370
371 /*
372 * Setup lowcore for boot cpu
373 */
374 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
375 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
376 if (!lc)
377 panic("%s: Failed to allocate %zu bytes align=%zx\n",
378 __func__, sizeof(*lc), sizeof(*lc));
379
380 lc->restart_psw.mask = PSW_KERNEL_BITS;
381 lc->restart_psw.addr = (unsigned long) restart_int_handler;
382 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
383 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
384 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
385 lc->svc_new_psw.addr = (unsigned long) system_call;
386 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
387 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
388 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
389 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
390 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
391 lc->io_new_psw.addr = (unsigned long) io_int_handler;
392 lc->clock_comparator = clock_comparator_max;
393 lc->nodat_stack = ((unsigned long) &init_thread_union)
394 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
395 lc->current_task = (unsigned long)&init_task;
396 lc->lpp = LPP_MAGIC;
397 lc->machine_flags = S390_lowcore.machine_flags;
398 lc->preempt_count = S390_lowcore.preempt_count;
399 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
400 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
401 sizeof(lc->stfle_fac_list));
402 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
403 sizeof(lc->alt_stfle_fac_list));
404 nmi_alloc_boot_cpu(lc);
405 vdso_alloc_boot_cpu(lc);
406 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
407 lc->async_enter_timer = S390_lowcore.async_enter_timer;
408 lc->exit_timer = S390_lowcore.exit_timer;
409 lc->user_timer = S390_lowcore.user_timer;
410 lc->system_timer = S390_lowcore.system_timer;
411 lc->steal_timer = S390_lowcore.steal_timer;
412 lc->last_update_timer = S390_lowcore.last_update_timer;
413 lc->last_update_clock = S390_lowcore.last_update_clock;
414
415 /*
416 * Allocate the global restart stack which is the same for
417 * all CPUs in cast *one* of them does a PSW restart.
418 */
419 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
420 if (!restart_stack)
421 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
422 __func__, THREAD_SIZE, THREAD_SIZE);
423 restart_stack += STACK_INIT_OFFSET;
424
425 /*
426 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
427 * restart data to the absolute zero lowcore. This is necessary if
428 * PSW restart is done on an offline CPU that has lowcore zero.
429 */
430 lc->restart_stack = (unsigned long) restart_stack;
431 lc->restart_fn = (unsigned long) do_restart;
432 lc->restart_data = 0;
433 lc->restart_source = -1UL;
434
435 /* Setup absolute zero lowcore */
436 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
437 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
438 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
439 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
440 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
441
442 lc->spinlock_lockval = arch_spin_lockval(0);
443 lc->spinlock_index = 0;
444 arch_spin_lock_setup(0);
445 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
446 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
447 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
448
449 set_prefix((u32)(unsigned long) lc);
450 lowcore_ptr[0] = lc;
451}
452
453static void __init setup_lowcore_dat_on(void)
454{
455 __ctl_clear_bit(0, 28);
456 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
457 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
458 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
459 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
460 __ctl_set_bit(0, 28);
461}
462
463static struct resource code_resource = {
464 .name = "Kernel code",
465 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
466};
467
468static struct resource data_resource = {
469 .name = "Kernel data",
470 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
471};
472
473static struct resource bss_resource = {
474 .name = "Kernel bss",
475 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
476};
477
478static struct resource __initdata *standard_resources[] = {
479 &code_resource,
480 &data_resource,
481 &bss_resource,
482};
483
484static void __init setup_resources(void)
485{
486 struct resource *res, *std_res, *sub_res;
487 struct memblock_region *reg;
488 int j;
489
490 code_resource.start = (unsigned long) _text;
491 code_resource.end = (unsigned long) _etext - 1;
492 data_resource.start = (unsigned long) _etext;
493 data_resource.end = (unsigned long) _edata - 1;
494 bss_resource.start = (unsigned long) __bss_start;
495 bss_resource.end = (unsigned long) __bss_stop - 1;
496
497 for_each_memblock(memory, reg) {
498 res = memblock_alloc(sizeof(*res), 8);
499 if (!res)
500 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
501 __func__, sizeof(*res), 8);
502 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
503
504 res->name = "System RAM";
505 res->start = reg->base;
506 res->end = reg->base + reg->size - 1;
507 request_resource(&iomem_resource, res);
508
509 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
510 std_res = standard_resources[j];
511 if (std_res->start < res->start ||
512 std_res->start > res->end)
513 continue;
514 if (std_res->end > res->end) {
515 sub_res = memblock_alloc(sizeof(*sub_res), 8);
516 if (!sub_res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*sub_res), 8);
519 *sub_res = *std_res;
520 sub_res->end = res->end;
521 std_res->start = res->end + 1;
522 request_resource(res, sub_res);
523 } else {
524 request_resource(res, std_res);
525 }
526 }
527 }
528#ifdef CONFIG_CRASH_DUMP
529 /*
530 * Re-add removed crash kernel memory as reserved memory. This makes
531 * sure it will be mapped with the identity mapping and struct pages
532 * will be created, so it can be resized later on.
533 * However add it later since the crash kernel resource should not be
534 * part of the System RAM resource.
535 */
536 if (crashk_res.end) {
537 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
538 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
539 insert_resource(&iomem_resource, &crashk_res);
540 }
541#endif
542}
543
544static void __init setup_memory_end(void)
545{
546 unsigned long vmax, tmp;
547
548 /* Choose kernel address space layout: 3 or 4 levels. */
549 if (IS_ENABLED(CONFIG_KASAN)) {
550 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
551 ? _REGION1_SIZE
552 : _REGION2_SIZE;
553 } else {
554 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
555 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
556 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
557 vmax = _REGION2_SIZE; /* 3-level kernel page table */
558 else
559 vmax = _REGION1_SIZE; /* 4-level kernel page table */
560 }
561
562 if (is_prot_virt_host())
563 adjust_to_uv_max(&vmax);
564
565 /* module area is at the end of the kernel address space. */
566 MODULES_END = vmax;
567 MODULES_VADDR = MODULES_END - MODULES_LEN;
568 VMALLOC_END = MODULES_VADDR;
569 VMALLOC_START = VMALLOC_END - vmalloc_size;
570
571 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
572 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
573 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
574 tmp = SECTION_ALIGN_UP(tmp);
575 tmp = VMALLOC_START - tmp * sizeof(struct page);
576 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
577 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
578 vmemmap = (struct page *) tmp;
579
580 /* Take care that memory_end is set and <= vmemmap */
581 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
582#ifdef CONFIG_KASAN
583 /* fit in kasan shadow memory region between 1:1 and vmemmap */
584 memory_end = min(memory_end, KASAN_SHADOW_START);
585 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
586#endif
587 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
588 memblock_remove(memory_end, ULONG_MAX);
589
590 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
591}
592
593#ifdef CONFIG_CRASH_DUMP
594
595/*
596 * When kdump is enabled, we have to ensure that no memory from the area
597 * [0 - crashkernel memory size] is set offline - it will be exchanged with
598 * the crashkernel memory region when kdump is triggered. The crashkernel
599 * memory region can never get offlined (pages are unmovable).
600 */
601static int kdump_mem_notifier(struct notifier_block *nb,
602 unsigned long action, void *data)
603{
604 struct memory_notify *arg = data;
605
606 if (action != MEM_GOING_OFFLINE)
607 return NOTIFY_OK;
608 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
609 return NOTIFY_BAD;
610 return NOTIFY_OK;
611}
612
613static struct notifier_block kdump_mem_nb = {
614 .notifier_call = kdump_mem_notifier,
615};
616
617#endif
618
619/*
620 * Make sure that the area behind memory_end is protected
621 */
622static void __init reserve_memory_end(void)
623{
624 if (memory_end_set)
625 memblock_reserve(memory_end, ULONG_MAX);
626}
627
628/*
629 * Make sure that oldmem, where the dump is stored, is protected
630 */
631static void __init reserve_oldmem(void)
632{
633#ifdef CONFIG_CRASH_DUMP
634 if (OLDMEM_BASE)
635 /* Forget all memory above the running kdump system */
636 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
637#endif
638}
639
640/*
641 * Make sure that oldmem, where the dump is stored, is protected
642 */
643static void __init remove_oldmem(void)
644{
645#ifdef CONFIG_CRASH_DUMP
646 if (OLDMEM_BASE)
647 /* Forget all memory above the running kdump system */
648 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
649#endif
650}
651
652/*
653 * Reserve memory for kdump kernel to be loaded with kexec
654 */
655static void __init reserve_crashkernel(void)
656{
657#ifdef CONFIG_CRASH_DUMP
658 unsigned long long crash_base, crash_size;
659 phys_addr_t low, high;
660 int rc;
661
662 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
663 &crash_base);
664
665 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
666 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
667 if (rc || crash_size == 0)
668 return;
669
670 if (memblock.memory.regions[0].size < crash_size) {
671 pr_info("crashkernel reservation failed: %s\n",
672 "first memory chunk must be at least crashkernel size");
673 return;
674 }
675
676 low = crash_base ?: OLDMEM_BASE;
677 high = low + crash_size;
678 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
679 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
680 crash_base = low;
681 } else {
682 /* Find suitable area in free memory */
683 low = max_t(unsigned long, crash_size, sclp.hsa_size);
684 high = crash_base ? crash_base + crash_size : ULONG_MAX;
685
686 if (crash_base && crash_base < low) {
687 pr_info("crashkernel reservation failed: %s\n",
688 "crash_base too low");
689 return;
690 }
691 low = crash_base ?: low;
692 crash_base = memblock_find_in_range(low, high, crash_size,
693 KEXEC_CRASH_MEM_ALIGN);
694 }
695
696 if (!crash_base) {
697 pr_info("crashkernel reservation failed: %s\n",
698 "no suitable area found");
699 return;
700 }
701
702 if (register_memory_notifier(&kdump_mem_nb))
703 return;
704
705 if (!OLDMEM_BASE && MACHINE_IS_VM)
706 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
707 crashk_res.start = crash_base;
708 crashk_res.end = crash_base + crash_size - 1;
709 memblock_remove(crash_base, crash_size);
710 pr_info("Reserving %lluMB of memory at %lluMB "
711 "for crashkernel (System RAM: %luMB)\n",
712 crash_size >> 20, crash_base >> 20,
713 (unsigned long)memblock.memory.total_size >> 20);
714 os_info_crashkernel_add(crash_base, crash_size);
715#endif
716}
717
718/*
719 * Reserve the initrd from being used by memblock
720 */
721static void __init reserve_initrd(void)
722{
723#ifdef CONFIG_BLK_DEV_INITRD
724 if (!INITRD_START || !INITRD_SIZE)
725 return;
726 initrd_start = INITRD_START;
727 initrd_end = initrd_start + INITRD_SIZE;
728 memblock_reserve(INITRD_START, INITRD_SIZE);
729#endif
730}
731
732/*
733 * Reserve the memory area used to pass the certificate lists
734 */
735static void __init reserve_certificate_list(void)
736{
737 if (ipl_cert_list_addr)
738 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
739}
740
741static void __init reserve_mem_detect_info(void)
742{
743 unsigned long start, size;
744
745 get_mem_detect_reserved(&start, &size);
746 if (size)
747 memblock_reserve(start, size);
748}
749
750static void __init free_mem_detect_info(void)
751{
752 unsigned long start, size;
753
754 get_mem_detect_reserved(&start, &size);
755 if (size)
756 memblock_free(start, size);
757}
758
759static const char * __init get_mem_info_source(void)
760{
761 switch (mem_detect.info_source) {
762 case MEM_DETECT_SCLP_STOR_INFO:
763 return "sclp storage info";
764 case MEM_DETECT_DIAG260:
765 return "diag260";
766 case MEM_DETECT_SCLP_READ_INFO:
767 return "sclp read info";
768 case MEM_DETECT_BIN_SEARCH:
769 return "binary search";
770 }
771 return "none";
772}
773
774static void __init memblock_add_mem_detect_info(void)
775{
776 unsigned long start, end;
777 int i;
778
779 memblock_dbg("physmem info source: %s (%hhd)\n",
780 get_mem_info_source(), mem_detect.info_source);
781 /* keep memblock lists close to the kernel */
782 memblock_set_bottom_up(true);
783 for_each_mem_detect_block(i, &start, &end) {
784 memblock_add(start, end - start);
785 memblock_physmem_add(start, end - start);
786 }
787 memblock_set_bottom_up(false);
788 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
789 memblock_dump_all();
790}
791
792/*
793 * Check for initrd being in usable memory
794 */
795static void __init check_initrd(void)
796{
797#ifdef CONFIG_BLK_DEV_INITRD
798 if (INITRD_START && INITRD_SIZE &&
799 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
800 pr_err("The initial RAM disk does not fit into the memory\n");
801 memblock_free(INITRD_START, INITRD_SIZE);
802 initrd_start = initrd_end = 0;
803 }
804#endif
805}
806
807/*
808 * Reserve memory used for lowcore/command line/kernel image.
809 */
810static void __init reserve_kernel(void)
811{
812 unsigned long start_pfn = PFN_UP(__pa(_end));
813
814 memblock_reserve(0, HEAD_END);
815 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
816 - (unsigned long)_stext);
817 memblock_reserve(__sdma, __edma - __sdma);
818}
819
820static void __init setup_memory(void)
821{
822 struct memblock_region *reg;
823
824 /*
825 * Init storage key for present memory
826 */
827 for_each_memblock(memory, reg) {
828 storage_key_init_range(reg->base, reg->base + reg->size);
829 }
830 psw_set_key(PAGE_DEFAULT_KEY);
831
832 /* Only cosmetics */
833 memblock_enforce_memory_limit(memblock_end_of_DRAM());
834}
835
836/*
837 * Setup hardware capabilities.
838 */
839static int __init setup_hwcaps(void)
840{
841 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
842 struct cpuid cpu_id;
843 int i;
844
845 /*
846 * The store facility list bits numbers as found in the principles
847 * of operation are numbered with bit 1UL<<31 as number 0 to
848 * bit 1UL<<0 as number 31.
849 * Bit 0: instructions named N3, "backported" to esa-mode
850 * Bit 2: z/Architecture mode is active
851 * Bit 7: the store-facility-list-extended facility is installed
852 * Bit 17: the message-security assist is installed
853 * Bit 19: the long-displacement facility is installed
854 * Bit 21: the extended-immediate facility is installed
855 * Bit 22: extended-translation facility 3 is installed
856 * Bit 30: extended-translation facility 3 enhancement facility
857 * These get translated to:
858 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
859 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
860 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
861 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
862 */
863 for (i = 0; i < 6; i++)
864 if (test_facility(stfl_bits[i]))
865 elf_hwcap |= 1UL << i;
866
867 if (test_facility(22) && test_facility(30))
868 elf_hwcap |= HWCAP_S390_ETF3EH;
869
870 /*
871 * Check for additional facilities with store-facility-list-extended.
872 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
873 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
874 * as stored by stfl, bits 32-xxx contain additional facilities.
875 * How many facility words are stored depends on the number of
876 * doublewords passed to the instruction. The additional facilities
877 * are:
878 * Bit 42: decimal floating point facility is installed
879 * Bit 44: perform floating point operation facility is installed
880 * translated to:
881 * HWCAP_S390_DFP bit 6 (42 && 44).
882 */
883 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
884 elf_hwcap |= HWCAP_S390_DFP;
885
886 /*
887 * Huge page support HWCAP_S390_HPAGE is bit 7.
888 */
889 if (MACHINE_HAS_EDAT1)
890 elf_hwcap |= HWCAP_S390_HPAGE;
891
892 /*
893 * 64-bit register support for 31-bit processes
894 * HWCAP_S390_HIGH_GPRS is bit 9.
895 */
896 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
897
898 /*
899 * Transactional execution support HWCAP_S390_TE is bit 10.
900 */
901 if (MACHINE_HAS_TE)
902 elf_hwcap |= HWCAP_S390_TE;
903
904 /*
905 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
906 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
907 * instead of facility bit 129.
908 */
909 if (MACHINE_HAS_VX) {
910 elf_hwcap |= HWCAP_S390_VXRS;
911 if (test_facility(134))
912 elf_hwcap |= HWCAP_S390_VXRS_EXT;
913 if (test_facility(135))
914 elf_hwcap |= HWCAP_S390_VXRS_BCD;
915 if (test_facility(148))
916 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
917 if (test_facility(152))
918 elf_hwcap |= HWCAP_S390_VXRS_PDE;
919 }
920 if (test_facility(150))
921 elf_hwcap |= HWCAP_S390_SORT;
922 if (test_facility(151))
923 elf_hwcap |= HWCAP_S390_DFLT;
924
925 /*
926 * Guarded storage support HWCAP_S390_GS is bit 12.
927 */
928 if (MACHINE_HAS_GS)
929 elf_hwcap |= HWCAP_S390_GS;
930
931 get_cpu_id(&cpu_id);
932 add_device_randomness(&cpu_id, sizeof(cpu_id));
933 switch (cpu_id.machine) {
934 case 0x2064:
935 case 0x2066:
936 default: /* Use "z900" as default for 64 bit kernels. */
937 strcpy(elf_platform, "z900");
938 break;
939 case 0x2084:
940 case 0x2086:
941 strcpy(elf_platform, "z990");
942 break;
943 case 0x2094:
944 case 0x2096:
945 strcpy(elf_platform, "z9-109");
946 break;
947 case 0x2097:
948 case 0x2098:
949 strcpy(elf_platform, "z10");
950 break;
951 case 0x2817:
952 case 0x2818:
953 strcpy(elf_platform, "z196");
954 break;
955 case 0x2827:
956 case 0x2828:
957 strcpy(elf_platform, "zEC12");
958 break;
959 case 0x2964:
960 case 0x2965:
961 strcpy(elf_platform, "z13");
962 break;
963 case 0x3906:
964 case 0x3907:
965 strcpy(elf_platform, "z14");
966 break;
967 case 0x8561:
968 case 0x8562:
969 strcpy(elf_platform, "z15");
970 break;
971 }
972
973 /*
974 * Virtualization support HWCAP_INT_SIE is bit 0.
975 */
976 if (sclp.has_sief2)
977 int_hwcap |= HWCAP_INT_SIE;
978
979 return 0;
980}
981arch_initcall(setup_hwcaps);
982
983/*
984 * Add system information as device randomness
985 */
986static void __init setup_randomness(void)
987{
988 struct sysinfo_3_2_2 *vmms;
989
990 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
991 PAGE_SIZE);
992 if (!vmms)
993 panic("Failed to allocate memory for sysinfo structure\n");
994
995 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
996 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
997 memblock_free((unsigned long) vmms, PAGE_SIZE);
998}
999
1000/*
1001 * Find the correct size for the task_struct. This depends on
1002 * the size of the struct fpu at the end of the thread_struct
1003 * which is embedded in the task_struct.
1004 */
1005static void __init setup_task_size(void)
1006{
1007 int task_size = sizeof(struct task_struct);
1008
1009 if (!MACHINE_HAS_VX) {
1010 task_size -= sizeof(__vector128) * __NUM_VXRS;
1011 task_size += sizeof(freg_t) * __NUM_FPRS;
1012 }
1013 arch_task_struct_size = task_size;
1014}
1015
1016/*
1017 * Issue diagnose 318 to set the control program name and
1018 * version codes.
1019 */
1020static void __init setup_control_program_code(void)
1021{
1022 union diag318_info diag318_info = {
1023 .cpnc = CPNC_LINUX,
1024 .cpvc = 0,
1025 };
1026
1027 if (!sclp.has_diag318)
1028 return;
1029
1030 diag_stat_inc(DIAG_STAT_X318);
1031 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1032}
1033
1034/*
1035 * Print the component list from the IPL report
1036 */
1037static void __init log_component_list(void)
1038{
1039 struct ipl_rb_component_entry *ptr, *end;
1040 char *str;
1041
1042 if (!early_ipl_comp_list_addr)
1043 return;
1044 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1045 pr_info("Linux is running with Secure-IPL enabled\n");
1046 else
1047 pr_info("Linux is running with Secure-IPL disabled\n");
1048 ptr = (void *) early_ipl_comp_list_addr;
1049 end = (void *) ptr + early_ipl_comp_list_size;
1050 pr_info("The IPL report contains the following components:\n");
1051 while (ptr < end) {
1052 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1053 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1054 str = "signed, verified";
1055 else
1056 str = "signed, verification failed";
1057 } else {
1058 str = "not signed";
1059 }
1060 pr_info("%016llx - %016llx (%s)\n",
1061 ptr->addr, ptr->addr + ptr->len, str);
1062 ptr++;
1063 }
1064}
1065
1066/*
1067 * Setup function called from init/main.c just after the banner
1068 * was printed.
1069 */
1070
1071void __init setup_arch(char **cmdline_p)
1072{
1073 /*
1074 * print what head.S has found out about the machine
1075 */
1076 if (MACHINE_IS_VM)
1077 pr_info("Linux is running as a z/VM "
1078 "guest operating system in 64-bit mode\n");
1079 else if (MACHINE_IS_KVM)
1080 pr_info("Linux is running under KVM in 64-bit mode\n");
1081 else if (MACHINE_IS_LPAR)
1082 pr_info("Linux is running natively in 64-bit mode\n");
1083 else
1084 pr_info("Linux is running as a guest in 64-bit mode\n");
1085
1086 log_component_list();
1087
1088 /* Have one command line that is parsed and saved in /proc/cmdline */
1089 /* boot_command_line has been already set up in early.c */
1090 *cmdline_p = boot_command_line;
1091
1092 ROOT_DEV = Root_RAM0;
1093
1094 init_mm.start_code = (unsigned long) _text;
1095 init_mm.end_code = (unsigned long) _etext;
1096 init_mm.end_data = (unsigned long) _edata;
1097 init_mm.brk = (unsigned long) _end;
1098
1099 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1100 nospec_auto_detect();
1101
1102 jump_label_init();
1103 parse_early_param();
1104#ifdef CONFIG_CRASH_DUMP
1105 /* Deactivate elfcorehdr= kernel parameter */
1106 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1107#endif
1108
1109 os_info_init();
1110 setup_ipl();
1111 setup_task_size();
1112 setup_control_program_code();
1113
1114 /* Do some memory reservations *before* memory is added to memblock */
1115 reserve_memory_end();
1116 reserve_oldmem();
1117 reserve_kernel();
1118 reserve_initrd();
1119 reserve_certificate_list();
1120 reserve_mem_detect_info();
1121 memblock_allow_resize();
1122
1123 /* Get information about *all* installed memory */
1124 memblock_add_mem_detect_info();
1125
1126 free_mem_detect_info();
1127 remove_oldmem();
1128
1129 if (is_prot_virt_host())
1130 setup_uv();
1131 setup_memory_end();
1132 setup_memory();
1133 dma_contiguous_reserve(memory_end);
1134 vmcp_cma_reserve();
1135
1136 check_initrd();
1137 reserve_crashkernel();
1138#ifdef CONFIG_CRASH_DUMP
1139 /*
1140 * Be aware that smp_save_dump_cpus() triggers a system reset.
1141 * Therefore CPU and device initialization should be done afterwards.
1142 */
1143 smp_save_dump_cpus();
1144#endif
1145
1146 setup_resources();
1147 setup_lowcore_dat_off();
1148 smp_fill_possible_mask();
1149 cpu_detect_mhz_feature();
1150 cpu_init();
1151 numa_setup();
1152 smp_detect_cpus();
1153 topology_init_early();
1154
1155 /*
1156 * Create kernel page tables and switch to virtual addressing.
1157 */
1158 paging_init();
1159
1160 /*
1161 * After paging_init created the kernel page table, the new PSWs
1162 * in lowcore can now run with DAT enabled.
1163 */
1164 setup_lowcore_dat_on();
1165
1166 /* Setup default console */
1167 conmode_default();
1168 set_preferred_console();
1169
1170 apply_alternative_instructions();
1171 if (IS_ENABLED(CONFIG_EXPOLINE))
1172 nospec_init_branches();
1173
1174 /* Setup zfcpdump support */
1175 setup_zfcpdump();
1176
1177 /* Add system specific data to the random pool */
1178 setup_randomness();
1179}