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 */
86 unsigned int console_mode = 0;
87 EXPORT_SYMBOL(console_mode);
88
89 unsigned int console_devno = -1;
90 EXPORT_SYMBOL(console_devno);
91
92 unsigned int console_irq = -1;
93 EXPORT_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 */
100 char __amode31_ref *__samode31 = _samode31;
101 char __amode31_ref *__eamode31 = _eamode31;
102 char __amode31_ref *__stext_amode31 = _stext_amode31;
103 char __amode31_ref *__etext_amode31 = _etext_amode31;
104 struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105 struct 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
121 static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123 static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125 };
126
127 static __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
138 static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141 };
142
143 static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144 static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145 static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146 static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148 unsigned long __bootdata_preserved(max_mappable);
149 unsigned long __bootdata(ident_map_size);
150 struct physmem_info __bootdata(physmem_info);
151
152 unsigned long __bootdata_preserved(__kaslr_offset);
153 int __bootdata_preserved(__kaslr_enabled);
154 unsigned int __bootdata_preserved(zlib_dfltcc_support);
155 EXPORT_SYMBOL(zlib_dfltcc_support);
156 u64 __bootdata_preserved(stfle_fac_list[16]);
157 EXPORT_SYMBOL(stfle_fac_list);
158 u64 alt_stfle_fac_list[16];
159 struct oldmem_data __bootdata_preserved(oldmem_data);
160
161 unsigned long VMALLOC_START;
162 EXPORT_SYMBOL(VMALLOC_START);
163
164 unsigned long VMALLOC_END;
165 EXPORT_SYMBOL(VMALLOC_END);
166
167 struct page *vmemmap;
168 EXPORT_SYMBOL(vmemmap);
169 unsigned long vmemmap_size;
170
171 unsigned long MODULES_VADDR;
172 unsigned long MODULES_END;
173
174 /* An array with a pointer to the lowcore of every CPU. */
175 struct lowcore *lowcore_ptr[NR_CPUS];
176 EXPORT_SYMBOL(lowcore_ptr);
177
178 DEFINE_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 */
184 unsigned 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
condev_setup(char * str)198 static 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
set_preferred_console(void)212 static 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
conmode_setup(char * str)224 static 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
conmode_default(void)244 static 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
setup_zfcpdump(void)302 static void __init setup_zfcpdump(void)
303 {
304 if (!is_ipl_type_dump())
305 return;
306 if (oldmem_data.start)
307 return;
308 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
309 console_loglevel = 2;
310 }
311 #else
setup_zfcpdump(void)312 static 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
machine_restart(char * command)320 void 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
machine_halt(void)331 void 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
machine_power_off(void)342 void 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 */
356 void (*pm_power_off)(void) = machine_power_off;
357 EXPORT_SYMBOL_GPL(pm_power_off);
358
359 void *restart_stack;
360
stack_alloc(void)361 unsigned 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
stack_free(unsigned long stack)375 void 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
arch_call_rest_init(void)384 void __init __noreturn arch_call_rest_init(void)
385 {
386 smp_reinit_ipl_cpu();
387 rest_init();
388 }
389
stack_alloc_early(void)390 static unsigned long __init stack_alloc_early(void)
391 {
392 unsigned long stack;
393
394 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
395 if (!stack) {
396 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
397 __func__, THREAD_SIZE, THREAD_SIZE);
398 }
399 return stack;
400 }
401
setup_lowcore(void)402 static void __init setup_lowcore(void)
403 {
404 struct lowcore *lc, *abs_lc;
405
406 /*
407 * Setup lowcore for boot cpu
408 */
409 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
410 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
411 if (!lc)
412 panic("%s: Failed to allocate %zu bytes align=%zx\n",
413 __func__, sizeof(*lc), sizeof(*lc));
414
415 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
416 lc->restart_psw.addr = __pa(restart_int_handler);
417 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
418 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
419 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
420 lc->svc_new_psw.addr = (unsigned long) system_call;
421 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
422 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
423 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
424 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
425 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
426 lc->io_new_psw.addr = (unsigned long) io_int_handler;
427 lc->clock_comparator = clock_comparator_max;
428 lc->current_task = (unsigned long)&init_task;
429 lc->lpp = LPP_MAGIC;
430 lc->machine_flags = S390_lowcore.machine_flags;
431 lc->preempt_count = S390_lowcore.preempt_count;
432 nmi_alloc_mcesa_early(&lc->mcesad);
433 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
434 lc->exit_timer = S390_lowcore.exit_timer;
435 lc->user_timer = S390_lowcore.user_timer;
436 lc->system_timer = S390_lowcore.system_timer;
437 lc->steal_timer = S390_lowcore.steal_timer;
438 lc->last_update_timer = S390_lowcore.last_update_timer;
439 lc->last_update_clock = S390_lowcore.last_update_clock;
440 /*
441 * Allocate the global restart stack which is the same for
442 * all CPUs in case *one* of them does a PSW restart.
443 */
444 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
445 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
446 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
447 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
448 lc->kernel_stack = S390_lowcore.kernel_stack;
449 /*
450 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
451 * restart data to the absolute zero lowcore. This is necessary if
452 * PSW restart is done on an offline CPU that has lowcore zero.
453 */
454 lc->restart_stack = (unsigned long) restart_stack;
455 lc->restart_fn = (unsigned long) do_restart;
456 lc->restart_data = 0;
457 lc->restart_source = -1U;
458 __ctl_store(lc->cregs_save_area, 0, 15);
459 lc->spinlock_lockval = arch_spin_lockval(0);
460 lc->spinlock_index = 0;
461 arch_spin_lock_setup(0);
462 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
463 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
464 lc->preempt_count = PREEMPT_DISABLED;
465 lc->kernel_asce = S390_lowcore.kernel_asce;
466 lc->user_asce = S390_lowcore.user_asce;
467
468 abs_lc = get_abs_lowcore();
469 abs_lc->restart_stack = lc->restart_stack;
470 abs_lc->restart_fn = lc->restart_fn;
471 abs_lc->restart_data = lc->restart_data;
472 abs_lc->restart_source = lc->restart_source;
473 abs_lc->restart_psw = lc->restart_psw;
474 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
475 memcpy(abs_lc->cregs_save_area, lc->cregs_save_area, sizeof(abs_lc->cregs_save_area));
476 abs_lc->program_new_psw = lc->program_new_psw;
477 abs_lc->mcesad = lc->mcesad;
478 put_abs_lowcore(abs_lc);
479
480 set_prefix(__pa(lc));
481 lowcore_ptr[0] = lc;
482 if (abs_lowcore_map(0, lowcore_ptr[0], false))
483 panic("Couldn't setup absolute lowcore");
484 }
485
486 static struct resource code_resource = {
487 .name = "Kernel code",
488 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
489 };
490
491 static struct resource data_resource = {
492 .name = "Kernel data",
493 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
494 };
495
496 static struct resource bss_resource = {
497 .name = "Kernel bss",
498 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
499 };
500
501 static struct resource __initdata *standard_resources[] = {
502 &code_resource,
503 &data_resource,
504 &bss_resource,
505 };
506
setup_resources(void)507 static void __init setup_resources(void)
508 {
509 struct resource *res, *std_res, *sub_res;
510 phys_addr_t start, end;
511 int j;
512 u64 i;
513
514 code_resource.start = (unsigned long) _text;
515 code_resource.end = (unsigned long) _etext - 1;
516 data_resource.start = (unsigned long) _etext;
517 data_resource.end = (unsigned long) _edata - 1;
518 bss_resource.start = (unsigned long) __bss_start;
519 bss_resource.end = (unsigned long) __bss_stop - 1;
520
521 for_each_mem_range(i, &start, &end) {
522 res = memblock_alloc(sizeof(*res), 8);
523 if (!res)
524 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
525 __func__, sizeof(*res), 8);
526 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
527
528 res->name = "System RAM";
529 res->start = start;
530 /*
531 * In memblock, end points to the first byte after the
532 * range while in resources, end points to the last byte in
533 * the range.
534 */
535 res->end = end - 1;
536 request_resource(&iomem_resource, res);
537
538 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
539 std_res = standard_resources[j];
540 if (std_res->start < res->start ||
541 std_res->start > res->end)
542 continue;
543 if (std_res->end > res->end) {
544 sub_res = memblock_alloc(sizeof(*sub_res), 8);
545 if (!sub_res)
546 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
547 __func__, sizeof(*sub_res), 8);
548 *sub_res = *std_res;
549 sub_res->end = res->end;
550 std_res->start = res->end + 1;
551 request_resource(res, sub_res);
552 } else {
553 request_resource(res, std_res);
554 }
555 }
556 }
557 #ifdef CONFIG_CRASH_DUMP
558 /*
559 * Re-add removed crash kernel memory as reserved memory. This makes
560 * sure it will be mapped with the identity mapping and struct pages
561 * will be created, so it can be resized later on.
562 * However add it later since the crash kernel resource should not be
563 * part of the System RAM resource.
564 */
565 if (crashk_res.end) {
566 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
567 0, MEMBLOCK_NONE);
568 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
569 insert_resource(&iomem_resource, &crashk_res);
570 }
571 #endif
572 }
573
setup_memory_end(void)574 static void __init setup_memory_end(void)
575 {
576 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
577 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
578 }
579
580 #ifdef CONFIG_CRASH_DUMP
581
582 /*
583 * When kdump is enabled, we have to ensure that no memory from the area
584 * [0 - crashkernel memory size] is set offline - it will be exchanged with
585 * the crashkernel memory region when kdump is triggered. The crashkernel
586 * memory region can never get offlined (pages are unmovable).
587 */
kdump_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)588 static int kdump_mem_notifier(struct notifier_block *nb,
589 unsigned long action, void *data)
590 {
591 struct memory_notify *arg = data;
592
593 if (action != MEM_GOING_OFFLINE)
594 return NOTIFY_OK;
595 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
596 return NOTIFY_BAD;
597 return NOTIFY_OK;
598 }
599
600 static struct notifier_block kdump_mem_nb = {
601 .notifier_call = kdump_mem_notifier,
602 };
603
604 #endif
605
606 /*
607 * Reserve page tables created by decompressor
608 */
reserve_pgtables(void)609 static void __init reserve_pgtables(void)
610 {
611 unsigned long start, end;
612 struct reserved_range *range;
613
614 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
615 memblock_reserve(start, end - start);
616 }
617
618 /*
619 * Reserve memory for kdump kernel to be loaded with kexec
620 */
reserve_crashkernel(void)621 static void __init reserve_crashkernel(void)
622 {
623 #ifdef CONFIG_CRASH_DUMP
624 unsigned long long crash_base, crash_size;
625 phys_addr_t low, high;
626 int rc;
627
628 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
629 &crash_base);
630
631 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
632 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
633 if (rc || crash_size == 0)
634 return;
635
636 if (memblock.memory.regions[0].size < crash_size) {
637 pr_info("crashkernel reservation failed: %s\n",
638 "first memory chunk must be at least crashkernel size");
639 return;
640 }
641
642 low = crash_base ?: oldmem_data.start;
643 high = low + crash_size;
644 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
645 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
646 crash_base = low;
647 } else {
648 /* Find suitable area in free memory */
649 low = max_t(unsigned long, crash_size, sclp.hsa_size);
650 high = crash_base ? crash_base + crash_size : ULONG_MAX;
651
652 if (crash_base && crash_base < low) {
653 pr_info("crashkernel reservation failed: %s\n",
654 "crash_base too low");
655 return;
656 }
657 low = crash_base ?: low;
658 crash_base = memblock_phys_alloc_range(crash_size,
659 KEXEC_CRASH_MEM_ALIGN,
660 low, high);
661 }
662
663 if (!crash_base) {
664 pr_info("crashkernel reservation failed: %s\n",
665 "no suitable area found");
666 return;
667 }
668
669 if (register_memory_notifier(&kdump_mem_nb)) {
670 memblock_phys_free(crash_base, crash_size);
671 return;
672 }
673
674 if (!oldmem_data.start && MACHINE_IS_VM)
675 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
676 crashk_res.start = crash_base;
677 crashk_res.end = crash_base + crash_size - 1;
678 memblock_remove(crash_base, crash_size);
679 pr_info("Reserving %lluMB of memory at %lluMB "
680 "for crashkernel (System RAM: %luMB)\n",
681 crash_size >> 20, crash_base >> 20,
682 (unsigned long)memblock.memory.total_size >> 20);
683 os_info_crashkernel_add(crash_base, crash_size);
684 #endif
685 }
686
687 /*
688 * Reserve the initrd from being used by memblock
689 */
reserve_initrd(void)690 static void __init reserve_initrd(void)
691 {
692 unsigned long addr, size;
693
694 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
695 return;
696 initrd_start = (unsigned long)__va(addr);
697 initrd_end = initrd_start + size;
698 memblock_reserve(addr, size);
699 }
700
701 /*
702 * Reserve the memory area used to pass the certificate lists
703 */
reserve_certificate_list(void)704 static void __init reserve_certificate_list(void)
705 {
706 if (ipl_cert_list_addr)
707 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
708 }
709
reserve_physmem_info(void)710 static void __init reserve_physmem_info(void)
711 {
712 unsigned long addr, size;
713
714 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
715 memblock_reserve(addr, size);
716 }
717
free_physmem_info(void)718 static void __init free_physmem_info(void)
719 {
720 unsigned long addr, size;
721
722 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
723 memblock_phys_free(addr, size);
724 }
725
memblock_add_physmem_info(void)726 static void __init memblock_add_physmem_info(void)
727 {
728 unsigned long start, end;
729 int i;
730
731 pr_debug("physmem info source: %s (%hhd)\n",
732 get_physmem_info_source(), physmem_info.info_source);
733 /* keep memblock lists close to the kernel */
734 memblock_set_bottom_up(true);
735 for_each_physmem_usable_range(i, &start, &end)
736 memblock_add(start, end - start);
737 for_each_physmem_online_range(i, &start, &end)
738 memblock_physmem_add(start, end - start);
739 memblock_set_bottom_up(false);
740 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
741 }
742
743 /*
744 * Reserve memory used for lowcore/command line/kernel image.
745 */
reserve_kernel(void)746 static void __init reserve_kernel(void)
747 {
748 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
749 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
750 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
751 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
752 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
753 memblock_reserve(__pa(_stext), _end - _stext);
754 }
755
setup_memory(void)756 static void __init setup_memory(void)
757 {
758 phys_addr_t start, end;
759 u64 i;
760
761 /*
762 * Init storage key for present memory
763 */
764 for_each_mem_range(i, &start, &end)
765 storage_key_init_range(start, end);
766
767 psw_set_key(PAGE_DEFAULT_KEY);
768 }
769
relocate_amode31_section(void)770 static void __init relocate_amode31_section(void)
771 {
772 unsigned long amode31_size = __eamode31 - __samode31;
773 long amode31_offset, *ptr;
774
775 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31;
776 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
777
778 /* Move original AMODE31 section to the new one */
779 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
780 /* Zero out the old AMODE31 section to catch invalid accesses within it */
781 memset(__samode31, 0, amode31_size);
782
783 /* Update all AMODE31 region references */
784 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
785 *ptr += amode31_offset;
786 }
787
788 /* This must be called after AMODE31 relocation */
setup_cr(void)789 static void __init setup_cr(void)
790 {
791 union ctlreg2 cr2;
792 union ctlreg5 cr5;
793 union ctlreg15 cr15;
794
795 __ctl_duct[1] = (unsigned long)__ctl_aste;
796 __ctl_duct[2] = (unsigned long)__ctl_aste;
797 __ctl_duct[4] = (unsigned long)__ctl_duald;
798
799 /* Update control registers CR2, CR5 and CR15 */
800 __ctl_store(cr2.val, 2, 2);
801 __ctl_store(cr5.val, 5, 5);
802 __ctl_store(cr15.val, 15, 15);
803 cr2.ducto = (unsigned long)__ctl_duct >> 6;
804 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
805 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
806 __ctl_load(cr2.val, 2, 2);
807 __ctl_load(cr5.val, 5, 5);
808 __ctl_load(cr15.val, 15, 15);
809 }
810
811 /*
812 * Add system information as device randomness
813 */
setup_randomness(void)814 static void __init setup_randomness(void)
815 {
816 struct sysinfo_3_2_2 *vmms;
817
818 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
819 if (!vmms)
820 panic("Failed to allocate memory for sysinfo structure\n");
821 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
822 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
823 memblock_free(vmms, PAGE_SIZE);
824
825 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
826 static_branch_enable(&s390_arch_random_available);
827 }
828
829 /*
830 * Find the correct size for the task_struct. This depends on
831 * the size of the struct fpu at the end of the thread_struct
832 * which is embedded in the task_struct.
833 */
setup_task_size(void)834 static void __init setup_task_size(void)
835 {
836 int task_size = sizeof(struct task_struct);
837
838 if (!MACHINE_HAS_VX) {
839 task_size -= sizeof(__vector128) * __NUM_VXRS;
840 task_size += sizeof(freg_t) * __NUM_FPRS;
841 }
842 arch_task_struct_size = task_size;
843 }
844
845 /*
846 * Issue diagnose 318 to set the control program name and
847 * version codes.
848 */
setup_control_program_code(void)849 static void __init setup_control_program_code(void)
850 {
851 union diag318_info diag318_info = {
852 .cpnc = CPNC_LINUX,
853 .cpvc = 0,
854 };
855
856 if (!sclp.has_diag318)
857 return;
858
859 diag_stat_inc(DIAG_STAT_X318);
860 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
861 }
862
863 /*
864 * Print the component list from the IPL report
865 */
log_component_list(void)866 static void __init log_component_list(void)
867 {
868 struct ipl_rb_component_entry *ptr, *end;
869 char *str;
870
871 if (!early_ipl_comp_list_addr)
872 return;
873 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
874 pr_info("Linux is running with Secure-IPL enabled\n");
875 else
876 pr_info("Linux is running with Secure-IPL disabled\n");
877 ptr = __va(early_ipl_comp_list_addr);
878 end = (void *) ptr + early_ipl_comp_list_size;
879 pr_info("The IPL report contains the following components:\n");
880 while (ptr < end) {
881 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
882 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
883 str = "signed, verified";
884 else
885 str = "signed, verification failed";
886 } else {
887 str = "not signed";
888 }
889 pr_info("%016llx - %016llx (%s)\n",
890 ptr->addr, ptr->addr + ptr->len, str);
891 ptr++;
892 }
893 }
894
895 /*
896 * Setup function called from init/main.c just after the banner
897 * was printed.
898 */
899
setup_arch(char ** cmdline_p)900 void __init setup_arch(char **cmdline_p)
901 {
902 /*
903 * print what head.S has found out about the machine
904 */
905 if (MACHINE_IS_VM)
906 pr_info("Linux is running as a z/VM "
907 "guest operating system in 64-bit mode\n");
908 else if (MACHINE_IS_KVM)
909 pr_info("Linux is running under KVM in 64-bit mode\n");
910 else if (MACHINE_IS_LPAR)
911 pr_info("Linux is running natively in 64-bit mode\n");
912 else
913 pr_info("Linux is running as a guest in 64-bit mode\n");
914
915 log_component_list();
916
917 /* Have one command line that is parsed and saved in /proc/cmdline */
918 /* boot_command_line has been already set up in early.c */
919 *cmdline_p = boot_command_line;
920
921 ROOT_DEV = Root_RAM0;
922
923 setup_initial_init_mm(_text, _etext, _edata, _end);
924
925 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
926 nospec_auto_detect();
927
928 jump_label_init();
929 parse_early_param();
930 #ifdef CONFIG_CRASH_DUMP
931 /* Deactivate elfcorehdr= kernel parameter */
932 elfcorehdr_addr = ELFCORE_ADDR_MAX;
933 #endif
934
935 os_info_init();
936 setup_ipl();
937 setup_task_size();
938 setup_control_program_code();
939
940 /* Do some memory reservations *before* memory is added to memblock */
941 reserve_pgtables();
942 reserve_kernel();
943 reserve_initrd();
944 reserve_certificate_list();
945 reserve_physmem_info();
946 memblock_set_current_limit(ident_map_size);
947 memblock_allow_resize();
948
949 /* Get information about *all* installed memory */
950 memblock_add_physmem_info();
951
952 free_physmem_info();
953 setup_memory_end();
954 memblock_dump_all();
955 setup_memory();
956
957 relocate_amode31_section();
958 setup_cr();
959 setup_uv();
960 dma_contiguous_reserve(ident_map_size);
961 vmcp_cma_reserve();
962 if (MACHINE_HAS_EDAT2)
963 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
964
965 reserve_crashkernel();
966 #ifdef CONFIG_CRASH_DUMP
967 /*
968 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
969 * Therefore CPU and device initialization should be done afterwards.
970 */
971 smp_save_dump_secondary_cpus();
972 #endif
973
974 setup_resources();
975 setup_lowcore();
976 smp_fill_possible_mask();
977 cpu_detect_mhz_feature();
978 cpu_init();
979 numa_setup();
980 smp_detect_cpus();
981 topology_init_early();
982
983 if (test_facility(193))
984 static_branch_enable(&cpu_has_bear);
985
986 /*
987 * Create kernel page tables.
988 */
989 paging_init();
990
991 /*
992 * After paging_init created the kernel page table, the new PSWs
993 * in lowcore can now run with DAT enabled.
994 */
995 #ifdef CONFIG_CRASH_DUMP
996 smp_save_dump_ipl_cpu();
997 #endif
998
999 /* Setup default console */
1000 conmode_default();
1001 set_preferred_console();
1002
1003 apply_alternative_instructions();
1004 if (IS_ENABLED(CONFIG_EXPOLINE))
1005 nospec_init_branches();
1006
1007 /* Setup zfcp/nvme dump support */
1008 setup_zfcpdump();
1009
1010 /* Add system specific data to the random pool */
1011 setup_randomness();
1012 }
1013