1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12 /*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16 #define KMSG_COMPONENT "setup"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19 #include <linux/errno.h>
20 #include <linux/export.h>
21 #include <linux/sched.h>
22 #include <linux/sched/task.h>
23 #include <linux/cpu.h>
24 #include <linux/kernel.h>
25 #include <linux/memblock.h>
26 #include <linux/mm.h>
27 #include <linux/stddef.h>
28 #include <linux/unistd.h>
29 #include <linux/ptrace.h>
30 #include <linux/random.h>
31 #include <linux/user.h>
32 #include <linux/tty.h>
33 #include <linux/ioport.h>
34 #include <linux/delay.h>
35 #include <linux/init.h>
36 #include <linux/initrd.h>
37 #include <linux/root_dev.h>
38 #include <linux/console.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/dma-map-ops.h>
41 #include <linux/device.h>
42 #include <linux/notifier.h>
43 #include <linux/pfn.h>
44 #include <linux/ctype.h>
45 #include <linux/reboot.h>
46 #include <linux/topology.h>
47 #include <linux/kexec.h>
48 #include <linux/crash_dump.h>
49 #include <linux/memory.h>
50 #include <linux/compat.h>
51 #include <linux/start_kernel.h>
52 #include <linux/hugetlb.h>
53 #include <linux/kmemleak.h>
54
55 #include <asm/boot_data.h>
56 #include <asm/ipl.h>
57 #include <asm/facility.h>
58 #include <asm/smp.h>
59 #include <asm/mmu_context.h>
60 #include <asm/cpcmd.h>
61 #include <asm/lowcore.h>
62 #include <asm/nmi.h>
63 #include <asm/irq.h>
64 #include <asm/page.h>
65 #include <asm/ptrace.h>
66 #include <asm/sections.h>
67 #include <asm/ebcdic.h>
68 #include <asm/diag.h>
69 #include <asm/os_info.h>
70 #include <asm/sclp.h>
71 #include <asm/stacktrace.h>
72 #include <asm/sysinfo.h>
73 #include <asm/numa.h>
74 #include <asm/alternative.h>
75 #include <asm/nospec-branch.h>
76 #include <asm/mem_detect.h>
77 #include <asm/uv.h>
78 #include <asm/asm-offsets.h>
79 #include "entry.h"
80
81 /*
82 * Machine setup..
83 */
84 unsigned int console_mode = 0;
85 EXPORT_SYMBOL(console_mode);
86
87 unsigned int console_devno = -1;
88 EXPORT_SYMBOL(console_devno);
89
90 unsigned int console_irq = -1;
91 EXPORT_SYMBOL(console_irq);
92
93 /*
94 * Some code and data needs to stay below 2 GB, even when the kernel would be
95 * relocated above 2 GB, because it has to use 31 bit addresses.
96 * Such code and data is part of the .amode31 section.
97 */
98 unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
99 unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
100 unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
101 unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31;
102 struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
103 struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
104
105 /*
106 * Control registers CR2, CR5 and CR15 are initialized with addresses
107 * of tables that must be placed below 2G which is handled by the AMODE31
108 * sections.
109 * Because the AMODE31 sections are relocated below 2G at startup,
110 * the content of control registers CR2, CR5 and CR15 must be updated
111 * with new addresses after the relocation. The initial initialization of
112 * control registers occurs in head64.S and then gets updated again after AMODE31
113 * relocation. We must access the relevant AMODE31 tables indirectly via
114 * pointers placed in the .amode31.refs linker section. Those pointers get
115 * updated automatically during AMODE31 relocation and always contain a valid
116 * address within AMODE31 sections.
117 */
118
119 static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
120
121 static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
122 [1] = 0xffffffffffffffff
123 };
124
125 static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
126 0x80000000, 0, 0, 0,
127 0x80000000, 0, 0, 0,
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 };
135
136 static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
137 0, 0, 0x89000000, 0,
138 0, 0, 0x8a000000, 0
139 };
140
141 static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
142 static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
143 static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
144 static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
145
146 int __bootdata(noexec_disabled);
147 unsigned long __bootdata(ident_map_size);
148 struct mem_detect_info __bootdata(mem_detect);
149 struct initrd_data __bootdata(initrd_data);
150
151 unsigned long __bootdata_preserved(__kaslr_offset);
152 unsigned long __bootdata(__amode31_base);
153 unsigned int __bootdata_preserved(zlib_dfltcc_support);
154 EXPORT_SYMBOL(zlib_dfltcc_support);
155 u64 __bootdata_preserved(stfle_fac_list[16]);
156 EXPORT_SYMBOL(stfle_fac_list);
157 u64 __bootdata_preserved(alt_stfle_fac_list[16]);
158 struct oldmem_data __bootdata_preserved(oldmem_data);
159
160 unsigned long VMALLOC_START;
161 EXPORT_SYMBOL(VMALLOC_START);
162
163 unsigned long VMALLOC_END;
164 EXPORT_SYMBOL(VMALLOC_END);
165
166 struct page *vmemmap;
167 EXPORT_SYMBOL(vmemmap);
168 unsigned long vmemmap_size;
169
170 unsigned long MODULES_VADDR;
171 unsigned long MODULES_END;
172
173 /* An array with a pointer to the lowcore of every CPU. */
174 struct lowcore *lowcore_ptr[NR_CPUS];
175 EXPORT_SYMBOL(lowcore_ptr);
176
177 /*
178 * The Write Back bit position in the physaddr is given by the SLPC PCI.
179 * Leaving the mask zero always uses write through which is safe
180 */
181 unsigned long mio_wb_bit_mask __ro_after_init;
182
183 /*
184 * This is set up by the setup-routine at boot-time
185 * for S390 need to find out, what we have to setup
186 * using address 0x10400 ...
187 */
188
189 #include <asm/setup.h>
190
191 /*
192 * condev= and conmode= setup parameter.
193 */
194
condev_setup(char * str)195 static int __init condev_setup(char *str)
196 {
197 int vdev;
198
199 vdev = simple_strtoul(str, &str, 0);
200 if (vdev >= 0 && vdev < 65536) {
201 console_devno = vdev;
202 console_irq = -1;
203 }
204 return 1;
205 }
206
207 __setup("condev=", condev_setup);
208
set_preferred_console(void)209 static void __init set_preferred_console(void)
210 {
211 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
212 add_preferred_console("ttyS", 0, NULL);
213 else if (CONSOLE_IS_3270)
214 add_preferred_console("tty3270", 0, NULL);
215 else if (CONSOLE_IS_VT220)
216 add_preferred_console("ttysclp", 0, NULL);
217 else if (CONSOLE_IS_HVC)
218 add_preferred_console("hvc", 0, NULL);
219 }
220
conmode_setup(char * str)221 static int __init conmode_setup(char *str)
222 {
223 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
224 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
225 SET_CONSOLE_SCLP;
226 #endif
227 #if defined(CONFIG_TN3215_CONSOLE)
228 if (!strcmp(str, "3215"))
229 SET_CONSOLE_3215;
230 #endif
231 #if defined(CONFIG_TN3270_CONSOLE)
232 if (!strcmp(str, "3270"))
233 SET_CONSOLE_3270;
234 #endif
235 set_preferred_console();
236 return 1;
237 }
238
239 __setup("conmode=", conmode_setup);
240
conmode_default(void)241 static void __init conmode_default(void)
242 {
243 char query_buffer[1024];
244 char *ptr;
245
246 if (MACHINE_IS_VM) {
247 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
248 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
249 ptr = strstr(query_buffer, "SUBCHANNEL =");
250 console_irq = simple_strtoul(ptr + 13, NULL, 16);
251 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
252 ptr = strstr(query_buffer, "CONMODE");
253 /*
254 * Set the conmode to 3215 so that the device recognition
255 * will set the cu_type of the console to 3215. If the
256 * conmode is 3270 and we don't set it back then both
257 * 3215 and the 3270 driver will try to access the console
258 * device (3215 as console and 3270 as normal tty).
259 */
260 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
261 if (ptr == NULL) {
262 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
263 SET_CONSOLE_SCLP;
264 #endif
265 return;
266 }
267 if (str_has_prefix(ptr + 8, "3270")) {
268 #if defined(CONFIG_TN3270_CONSOLE)
269 SET_CONSOLE_3270;
270 #elif defined(CONFIG_TN3215_CONSOLE)
271 SET_CONSOLE_3215;
272 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
273 SET_CONSOLE_SCLP;
274 #endif
275 } else if (str_has_prefix(ptr + 8, "3215")) {
276 #if defined(CONFIG_TN3215_CONSOLE)
277 SET_CONSOLE_3215;
278 #elif defined(CONFIG_TN3270_CONSOLE)
279 SET_CONSOLE_3270;
280 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
281 SET_CONSOLE_SCLP;
282 #endif
283 }
284 } else if (MACHINE_IS_KVM) {
285 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
286 SET_CONSOLE_VT220;
287 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
288 SET_CONSOLE_SCLP;
289 else
290 SET_CONSOLE_HVC;
291 } else {
292 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
293 SET_CONSOLE_SCLP;
294 #endif
295 }
296 }
297
298 #ifdef CONFIG_CRASH_DUMP
setup_zfcpdump(void)299 static void __init setup_zfcpdump(void)
300 {
301 if (!is_ipl_type_dump())
302 return;
303 if (oldmem_data.start)
304 return;
305 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
306 console_loglevel = 2;
307 }
308 #else
setup_zfcpdump(void)309 static inline void setup_zfcpdump(void) {}
310 #endif /* CONFIG_CRASH_DUMP */
311
312 /*
313 * Reboot, halt and power_off stubs. They just call _machine_restart,
314 * _machine_halt or _machine_power_off.
315 */
316
machine_restart(char * command)317 void machine_restart(char *command)
318 {
319 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
320 /*
321 * Only unblank the console if we are called in enabled
322 * context or a bust_spinlocks cleared the way for us.
323 */
324 console_unblank();
325 _machine_restart(command);
326 }
327
machine_halt(void)328 void machine_halt(void)
329 {
330 if (!in_interrupt() || oops_in_progress)
331 /*
332 * Only unblank the console if we are called in enabled
333 * context or a bust_spinlocks cleared the way for us.
334 */
335 console_unblank();
336 _machine_halt();
337 }
338
machine_power_off(void)339 void machine_power_off(void)
340 {
341 if (!in_interrupt() || oops_in_progress)
342 /*
343 * Only unblank the console if we are called in enabled
344 * context or a bust_spinlocks cleared the way for us.
345 */
346 console_unblank();
347 _machine_power_off();
348 }
349
350 /*
351 * Dummy power off function.
352 */
353 void (*pm_power_off)(void) = machine_power_off;
354 EXPORT_SYMBOL_GPL(pm_power_off);
355
356 void *restart_stack;
357
stack_alloc(void)358 unsigned long stack_alloc(void)
359 {
360 #ifdef CONFIG_VMAP_STACK
361 void *ret;
362
363 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
364 NUMA_NO_NODE, __builtin_return_address(0));
365 kmemleak_not_leak(ret);
366 return (unsigned long)ret;
367 #else
368 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
369 #endif
370 }
371
stack_free(unsigned long stack)372 void stack_free(unsigned long stack)
373 {
374 #ifdef CONFIG_VMAP_STACK
375 vfree((void *) stack);
376 #else
377 free_pages(stack, THREAD_SIZE_ORDER);
378 #endif
379 }
380
arch_early_irq_init(void)381 int __init arch_early_irq_init(void)
382 {
383 unsigned long stack;
384
385 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
386 if (!stack)
387 panic("Couldn't allocate async stack");
388 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
389 return 0;
390 }
391
arch_call_rest_init(void)392 void __init arch_call_rest_init(void)
393 {
394 unsigned long stack;
395
396 stack = stack_alloc();
397 if (!stack)
398 panic("Couldn't allocate kernel stack");
399 current->stack = (void *) stack;
400 #ifdef CONFIG_VMAP_STACK
401 current->stack_vm_area = (void *) stack;
402 #endif
403 set_task_stack_end_magic(current);
404 stack += STACK_INIT_OFFSET;
405 S390_lowcore.kernel_stack = stack;
406 call_on_stack_noreturn(rest_init, stack);
407 }
408
setup_lowcore_dat_off(void)409 static void __init setup_lowcore_dat_off(void)
410 {
411 unsigned long int_psw_mask = PSW_KERNEL_BITS;
412 unsigned long mcck_stack;
413 struct lowcore *lc;
414
415 if (IS_ENABLED(CONFIG_KASAN))
416 int_psw_mask |= PSW_MASK_DAT;
417
418 /*
419 * Setup lowcore for boot cpu
420 */
421 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
422 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
423 if (!lc)
424 panic("%s: Failed to allocate %zu bytes align=%zx\n",
425 __func__, sizeof(*lc), sizeof(*lc));
426
427 lc->restart_psw.mask = PSW_KERNEL_BITS;
428 lc->restart_psw.addr = (unsigned long) restart_int_handler;
429 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
430 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
431 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
432 lc->svc_new_psw.addr = (unsigned long) system_call;
433 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
434 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
435 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
436 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
437 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
438 lc->io_new_psw.addr = (unsigned long) io_int_handler;
439 lc->clock_comparator = clock_comparator_max;
440 lc->nodat_stack = ((unsigned long) &init_thread_union)
441 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
442 lc->current_task = (unsigned long)&init_task;
443 lc->lpp = LPP_MAGIC;
444 lc->machine_flags = S390_lowcore.machine_flags;
445 lc->preempt_count = S390_lowcore.preempt_count;
446 nmi_alloc_boot_cpu(lc);
447 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
448 lc->exit_timer = S390_lowcore.exit_timer;
449 lc->user_timer = S390_lowcore.user_timer;
450 lc->system_timer = S390_lowcore.system_timer;
451 lc->steal_timer = S390_lowcore.steal_timer;
452 lc->last_update_timer = S390_lowcore.last_update_timer;
453 lc->last_update_clock = S390_lowcore.last_update_clock;
454
455 /*
456 * Allocate the global restart stack which is the same for
457 * all CPUs in cast *one* of them does a PSW restart.
458 */
459 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
460 if (!restart_stack)
461 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
462 __func__, THREAD_SIZE, THREAD_SIZE);
463 restart_stack += STACK_INIT_OFFSET;
464
465 /*
466 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
467 * restart data to the absolute zero lowcore. This is necessary if
468 * PSW restart is done on an offline CPU that has lowcore zero.
469 */
470 lc->restart_stack = (unsigned long) restart_stack;
471 lc->restart_fn = (unsigned long) do_restart;
472 lc->restart_data = 0;
473 lc->restart_source = -1U;
474
475 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
476 if (!mcck_stack)
477 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
478 __func__, THREAD_SIZE, THREAD_SIZE);
479 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
480
481 /* Setup absolute zero lowcore */
482 put_abs_lowcore(restart_stack, lc->restart_stack);
483 put_abs_lowcore(restart_fn, lc->restart_fn);
484 put_abs_lowcore(restart_data, lc->restart_data);
485 put_abs_lowcore(restart_source, lc->restart_source);
486 put_abs_lowcore(restart_psw, lc->restart_psw);
487 put_abs_lowcore(mcesad, lc->mcesad);
488
489 lc->spinlock_lockval = arch_spin_lockval(0);
490 lc->spinlock_index = 0;
491 arch_spin_lock_setup(0);
492 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
493 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
494 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
495 lc->preempt_count = PREEMPT_DISABLED;
496
497 set_prefix((u32)(unsigned long) lc);
498 lowcore_ptr[0] = lc;
499 }
500
setup_lowcore_dat_on(void)501 static void __init setup_lowcore_dat_on(void)
502 {
503 struct lowcore *lc = lowcore_ptr[0];
504 int cr;
505
506 __ctl_clear_bit(0, 28);
507 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
508 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
509 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
510 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
511 __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
512 __ctl_set_bit(0, 28);
513 put_abs_lowcore(restart_flags, RESTART_FLAG_CTLREGS);
514 put_abs_lowcore(program_new_psw, lc->program_new_psw);
515 for (cr = 0; cr < ARRAY_SIZE(lc->cregs_save_area); cr++)
516 put_abs_lowcore(cregs_save_area[cr], lc->cregs_save_area[cr]);
517 }
518
519 static struct resource code_resource = {
520 .name = "Kernel code",
521 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
522 };
523
524 static struct resource data_resource = {
525 .name = "Kernel data",
526 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
527 };
528
529 static struct resource bss_resource = {
530 .name = "Kernel bss",
531 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
532 };
533
534 static struct resource __initdata *standard_resources[] = {
535 &code_resource,
536 &data_resource,
537 &bss_resource,
538 };
539
setup_resources(void)540 static void __init setup_resources(void)
541 {
542 struct resource *res, *std_res, *sub_res;
543 phys_addr_t start, end;
544 int j;
545 u64 i;
546
547 code_resource.start = (unsigned long) _text;
548 code_resource.end = (unsigned long) _etext - 1;
549 data_resource.start = (unsigned long) _etext;
550 data_resource.end = (unsigned long) _edata - 1;
551 bss_resource.start = (unsigned long) __bss_start;
552 bss_resource.end = (unsigned long) __bss_stop - 1;
553
554 for_each_mem_range(i, &start, &end) {
555 res = memblock_alloc(sizeof(*res), 8);
556 if (!res)
557 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
558 __func__, sizeof(*res), 8);
559 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
560
561 res->name = "System RAM";
562 res->start = start;
563 /*
564 * In memblock, end points to the first byte after the
565 * range while in resourses, end points to the last byte in
566 * the range.
567 */
568 res->end = end - 1;
569 request_resource(&iomem_resource, res);
570
571 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
572 std_res = standard_resources[j];
573 if (std_res->start < res->start ||
574 std_res->start > res->end)
575 continue;
576 if (std_res->end > res->end) {
577 sub_res = memblock_alloc(sizeof(*sub_res), 8);
578 if (!sub_res)
579 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
580 __func__, sizeof(*sub_res), 8);
581 *sub_res = *std_res;
582 sub_res->end = res->end;
583 std_res->start = res->end + 1;
584 request_resource(res, sub_res);
585 } else {
586 request_resource(res, std_res);
587 }
588 }
589 }
590 #ifdef CONFIG_CRASH_DUMP
591 /*
592 * Re-add removed crash kernel memory as reserved memory. This makes
593 * sure it will be mapped with the identity mapping and struct pages
594 * will be created, so it can be resized later on.
595 * However add it later since the crash kernel resource should not be
596 * part of the System RAM resource.
597 */
598 if (crashk_res.end) {
599 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
600 0, MEMBLOCK_NONE);
601 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
602 insert_resource(&iomem_resource, &crashk_res);
603 }
604 #endif
605 }
606
setup_memory_end(void)607 static void __init setup_memory_end(void)
608 {
609 memblock_remove(ident_map_size, ULONG_MAX);
610 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
611 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
612 }
613
614 #ifdef CONFIG_CRASH_DUMP
615
616 /*
617 * When kdump is enabled, we have to ensure that no memory from the area
618 * [0 - crashkernel memory size] is set offline - it will be exchanged with
619 * the crashkernel memory region when kdump is triggered. The crashkernel
620 * memory region can never get offlined (pages are unmovable).
621 */
kdump_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)622 static int kdump_mem_notifier(struct notifier_block *nb,
623 unsigned long action, void *data)
624 {
625 struct memory_notify *arg = data;
626
627 if (action != MEM_GOING_OFFLINE)
628 return NOTIFY_OK;
629 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
630 return NOTIFY_BAD;
631 return NOTIFY_OK;
632 }
633
634 static struct notifier_block kdump_mem_nb = {
635 .notifier_call = kdump_mem_notifier,
636 };
637
638 #endif
639
640 /*
641 * Reserve memory for kdump kernel to be loaded with kexec
642 */
reserve_crashkernel(void)643 static void __init reserve_crashkernel(void)
644 {
645 #ifdef CONFIG_CRASH_DUMP
646 unsigned long long crash_base, crash_size;
647 phys_addr_t low, high;
648 int rc;
649
650 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
651 &crash_base);
652
653 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
654 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
655 if (rc || crash_size == 0)
656 return;
657
658 if (memblock.memory.regions[0].size < crash_size) {
659 pr_info("crashkernel reservation failed: %s\n",
660 "first memory chunk must be at least crashkernel size");
661 return;
662 }
663
664 low = crash_base ?: oldmem_data.start;
665 high = low + crash_size;
666 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
667 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
668 crash_base = low;
669 } else {
670 /* Find suitable area in free memory */
671 low = max_t(unsigned long, crash_size, sclp.hsa_size);
672 high = crash_base ? crash_base + crash_size : ULONG_MAX;
673
674 if (crash_base && crash_base < low) {
675 pr_info("crashkernel reservation failed: %s\n",
676 "crash_base too low");
677 return;
678 }
679 low = crash_base ?: low;
680 crash_base = memblock_phys_alloc_range(crash_size,
681 KEXEC_CRASH_MEM_ALIGN,
682 low, high);
683 }
684
685 if (!crash_base) {
686 pr_info("crashkernel reservation failed: %s\n",
687 "no suitable area found");
688 return;
689 }
690
691 if (register_memory_notifier(&kdump_mem_nb)) {
692 memblock_free(crash_base, crash_size);
693 return;
694 }
695
696 if (!oldmem_data.start && MACHINE_IS_VM)
697 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
698 crashk_res.start = crash_base;
699 crashk_res.end = crash_base + crash_size - 1;
700 memblock_remove(crash_base, crash_size);
701 pr_info("Reserving %lluMB of memory at %lluMB "
702 "for crashkernel (System RAM: %luMB)\n",
703 crash_size >> 20, crash_base >> 20,
704 (unsigned long)memblock.memory.total_size >> 20);
705 os_info_crashkernel_add(crash_base, crash_size);
706 #endif
707 }
708
709 /*
710 * Reserve the initrd from being used by memblock
711 */
reserve_initrd(void)712 static void __init reserve_initrd(void)
713 {
714 #ifdef CONFIG_BLK_DEV_INITRD
715 if (!initrd_data.start || !initrd_data.size)
716 return;
717 initrd_start = initrd_data.start;
718 initrd_end = initrd_start + initrd_data.size;
719 memblock_reserve(initrd_data.start, initrd_data.size);
720 #endif
721 }
722
723 /*
724 * Reserve the memory area used to pass the certificate lists
725 */
reserve_certificate_list(void)726 static void __init reserve_certificate_list(void)
727 {
728 if (ipl_cert_list_addr)
729 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
730 }
731
reserve_mem_detect_info(void)732 static void __init reserve_mem_detect_info(void)
733 {
734 unsigned long start, size;
735
736 get_mem_detect_reserved(&start, &size);
737 if (size)
738 memblock_reserve(start, size);
739 }
740
free_mem_detect_info(void)741 static void __init free_mem_detect_info(void)
742 {
743 unsigned long start, size;
744
745 get_mem_detect_reserved(&start, &size);
746 if (size)
747 memblock_free(start, size);
748 }
749
get_mem_info_source(void)750 static const char * __init get_mem_info_source(void)
751 {
752 switch (mem_detect.info_source) {
753 case MEM_DETECT_SCLP_STOR_INFO:
754 return "sclp storage info";
755 case MEM_DETECT_DIAG260:
756 return "diag260";
757 case MEM_DETECT_SCLP_READ_INFO:
758 return "sclp read info";
759 case MEM_DETECT_BIN_SEARCH:
760 return "binary search";
761 }
762 return "none";
763 }
764
memblock_add_mem_detect_info(void)765 static void __init memblock_add_mem_detect_info(void)
766 {
767 unsigned long start, end;
768 int i;
769
770 pr_debug("physmem info source: %s (%hhd)\n",
771 get_mem_info_source(), mem_detect.info_source);
772 /* keep memblock lists close to the kernel */
773 memblock_set_bottom_up(true);
774 for_each_mem_detect_block(i, &start, &end) {
775 memblock_add(start, end - start);
776 memblock_physmem_add(start, end - start);
777 }
778 memblock_set_bottom_up(false);
779 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
780 memblock_dump_all();
781 }
782
783 /*
784 * Check for initrd being in usable memory
785 */
check_initrd(void)786 static void __init check_initrd(void)
787 {
788 #ifdef CONFIG_BLK_DEV_INITRD
789 if (initrd_data.start && initrd_data.size &&
790 !memblock_is_region_memory(initrd_data.start, initrd_data.size)) {
791 pr_err("The initial RAM disk does not fit into the memory\n");
792 memblock_free(initrd_data.start, initrd_data.size);
793 initrd_start = initrd_end = 0;
794 }
795 #endif
796 }
797
798 /*
799 * Reserve memory used for lowcore/command line/kernel image.
800 */
reserve_kernel(void)801 static void __init reserve_kernel(void)
802 {
803 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
804 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
805 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
806 memblock_reserve(__amode31_base, __eamode31 - __samode31);
807 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
808 memblock_reserve(__pa(_stext), _end - _stext);
809 }
810
setup_memory(void)811 static void __init setup_memory(void)
812 {
813 phys_addr_t start, end;
814 u64 i;
815
816 /*
817 * Init storage key for present memory
818 */
819 for_each_mem_range(i, &start, &end)
820 storage_key_init_range(start, end);
821
822 psw_set_key(PAGE_DEFAULT_KEY);
823 }
824
relocate_amode31_section(void)825 static void __init relocate_amode31_section(void)
826 {
827 unsigned long amode31_size = __eamode31 - __samode31;
828 long amode31_offset = __amode31_base - __samode31;
829 long *ptr;
830
831 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
832
833 /* Move original AMODE31 section to the new one */
834 memmove((void *)__amode31_base, (void *)__samode31, amode31_size);
835 /* Zero out the old AMODE31 section to catch invalid accesses within it */
836 memset((void *)__samode31, 0, amode31_size);
837
838 /* Update all AMODE31 region references */
839 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
840 *ptr += amode31_offset;
841 }
842
843 /* This must be called after AMODE31 relocation */
setup_cr(void)844 static void __init setup_cr(void)
845 {
846 union ctlreg2 cr2;
847 union ctlreg5 cr5;
848 union ctlreg15 cr15;
849
850 __ctl_duct[1] = (unsigned long)__ctl_aste;
851 __ctl_duct[2] = (unsigned long)__ctl_aste;
852 __ctl_duct[4] = (unsigned long)__ctl_duald;
853
854 /* Update control registers CR2, CR5 and CR15 */
855 __ctl_store(cr2.val, 2, 2);
856 __ctl_store(cr5.val, 5, 5);
857 __ctl_store(cr15.val, 15, 15);
858 cr2.ducto = (unsigned long)__ctl_duct >> 6;
859 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
860 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
861 __ctl_load(cr2.val, 2, 2);
862 __ctl_load(cr5.val, 5, 5);
863 __ctl_load(cr15.val, 15, 15);
864 }
865
866 /*
867 * Add system information as device randomness
868 */
setup_randomness(void)869 static void __init setup_randomness(void)
870 {
871 struct sysinfo_3_2_2 *vmms;
872
873 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
874 PAGE_SIZE);
875 if (!vmms)
876 panic("Failed to allocate memory for sysinfo structure\n");
877
878 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
879 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
880 memblock_free((unsigned long) vmms, PAGE_SIZE);
881
882 #ifdef CONFIG_ARCH_RANDOM
883 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
884 static_branch_enable(&s390_arch_random_available);
885 #endif
886 }
887
888 /*
889 * Find the correct size for the task_struct. This depends on
890 * the size of the struct fpu at the end of the thread_struct
891 * which is embedded in the task_struct.
892 */
setup_task_size(void)893 static void __init setup_task_size(void)
894 {
895 int task_size = sizeof(struct task_struct);
896
897 if (!MACHINE_HAS_VX) {
898 task_size -= sizeof(__vector128) * __NUM_VXRS;
899 task_size += sizeof(freg_t) * __NUM_FPRS;
900 }
901 arch_task_struct_size = task_size;
902 }
903
904 /*
905 * Issue diagnose 318 to set the control program name and
906 * version codes.
907 */
setup_control_program_code(void)908 static void __init setup_control_program_code(void)
909 {
910 union diag318_info diag318_info = {
911 .cpnc = CPNC_LINUX,
912 .cpvc = 0,
913 };
914
915 if (!sclp.has_diag318)
916 return;
917
918 diag_stat_inc(DIAG_STAT_X318);
919 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
920 }
921
922 /*
923 * Print the component list from the IPL report
924 */
log_component_list(void)925 static void __init log_component_list(void)
926 {
927 struct ipl_rb_component_entry *ptr, *end;
928 char *str;
929
930 if (!early_ipl_comp_list_addr)
931 return;
932 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
933 pr_info("Linux is running with Secure-IPL enabled\n");
934 else
935 pr_info("Linux is running with Secure-IPL disabled\n");
936 ptr = (void *) early_ipl_comp_list_addr;
937 end = (void *) ptr + early_ipl_comp_list_size;
938 pr_info("The IPL report contains the following components:\n");
939 while (ptr < end) {
940 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
941 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
942 str = "signed, verified";
943 else
944 str = "signed, verification failed";
945 } else {
946 str = "not signed";
947 }
948 pr_info("%016llx - %016llx (%s)\n",
949 ptr->addr, ptr->addr + ptr->len, str);
950 ptr++;
951 }
952 }
953
954 /*
955 * Setup function called from init/main.c just after the banner
956 * was printed.
957 */
958
setup_arch(char ** cmdline_p)959 void __init setup_arch(char **cmdline_p)
960 {
961 /*
962 * print what head.S has found out about the machine
963 */
964 if (MACHINE_IS_VM)
965 pr_info("Linux is running as a z/VM "
966 "guest operating system in 64-bit mode\n");
967 else if (MACHINE_IS_KVM)
968 pr_info("Linux is running under KVM in 64-bit mode\n");
969 else if (MACHINE_IS_LPAR)
970 pr_info("Linux is running natively in 64-bit mode\n");
971 else
972 pr_info("Linux is running as a guest in 64-bit mode\n");
973
974 log_component_list();
975
976 /* Have one command line that is parsed and saved in /proc/cmdline */
977 /* boot_command_line has been already set up in early.c */
978 *cmdline_p = boot_command_line;
979
980 ROOT_DEV = Root_RAM0;
981
982 setup_initial_init_mm(_text, _etext, _edata, _end);
983
984 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
985 nospec_auto_detect();
986
987 jump_label_init();
988 parse_early_param();
989 #ifdef CONFIG_CRASH_DUMP
990 /* Deactivate elfcorehdr= kernel parameter */
991 elfcorehdr_addr = ELFCORE_ADDR_MAX;
992 #endif
993
994 os_info_init();
995 setup_ipl();
996 setup_task_size();
997 setup_control_program_code();
998
999 /* Do some memory reservations *before* memory is added to memblock */
1000 reserve_kernel();
1001 reserve_initrd();
1002 reserve_certificate_list();
1003 reserve_mem_detect_info();
1004 memblock_set_current_limit(ident_map_size);
1005 memblock_allow_resize();
1006
1007 /* Get information about *all* installed memory */
1008 memblock_add_mem_detect_info();
1009
1010 free_mem_detect_info();
1011
1012 relocate_amode31_section();
1013 setup_cr();
1014
1015 setup_uv();
1016 setup_memory_end();
1017 setup_memory();
1018 dma_contiguous_reserve(ident_map_size);
1019 vmcp_cma_reserve();
1020 if (MACHINE_HAS_EDAT2)
1021 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1022
1023 check_initrd();
1024 reserve_crashkernel();
1025 #ifdef CONFIG_CRASH_DUMP
1026 /*
1027 * Be aware that smp_save_dump_cpus() triggers a system reset.
1028 * Therefore CPU and device initialization should be done afterwards.
1029 */
1030 smp_save_dump_cpus();
1031 #endif
1032
1033 setup_resources();
1034 setup_lowcore_dat_off();
1035 smp_fill_possible_mask();
1036 cpu_detect_mhz_feature();
1037 cpu_init();
1038 numa_setup();
1039 smp_detect_cpus();
1040 topology_init_early();
1041
1042 /*
1043 * Create kernel page tables and switch to virtual addressing.
1044 */
1045 paging_init();
1046
1047 /*
1048 * After paging_init created the kernel page table, the new PSWs
1049 * in lowcore can now run with DAT enabled.
1050 */
1051 setup_lowcore_dat_on();
1052
1053 /* Setup default console */
1054 conmode_default();
1055 set_preferred_console();
1056
1057 apply_alternative_instructions();
1058 if (IS_ENABLED(CONFIG_EXPOLINE))
1059 nospec_init_branches();
1060
1061 /* Setup zfcp/nvme dump support */
1062 setup_zfcpdump();
1063
1064 /* Add system specific data to the random pool */
1065 setup_randomness();
1066 }
1067