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1/*
2 * arch/s390/kernel/setup.c
3 *
4 * S390 version
5 * Copyright (C) IBM Corp. 1999,2012
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
11 */
12
13/*
14 * This file handles the architecture-dependent parts of initialization
15 */
16
17#define KMSG_COMPONENT "setup"
18#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20#include <linux/errno.h>
21#include <linux/module.h>
22#include <linux/sched.h>
23#include <linux/kernel.h>
24#include <linux/memblock.h>
25#include <linux/mm.h>
26#include <linux/stddef.h>
27#include <linux/unistd.h>
28#include <linux/ptrace.h>
29#include <linux/user.h>
30#include <linux/tty.h>
31#include <linux/ioport.h>
32#include <linux/delay.h>
33#include <linux/init.h>
34#include <linux/initrd.h>
35#include <linux/bootmem.h>
36#include <linux/root_dev.h>
37#include <linux/console.h>
38#include <linux/kernel_stat.h>
39#include <linux/device.h>
40#include <linux/notifier.h>
41#include <linux/pfn.h>
42#include <linux/ctype.h>
43#include <linux/reboot.h>
44#include <linux/topology.h>
45#include <linux/ftrace.h>
46#include <linux/kexec.h>
47#include <linux/crash_dump.h>
48#include <linux/memory.h>
49#include <linux/compat.h>
50
51#include <asm/ipl.h>
52#include <asm/uaccess.h>
53#include <asm/facility.h>
54#include <asm/smp.h>
55#include <asm/mmu_context.h>
56#include <asm/cpcmd.h>
57#include <asm/lowcore.h>
58#include <asm/irq.h>
59#include <asm/page.h>
60#include <asm/ptrace.h>
61#include <asm/sections.h>
62#include <asm/ebcdic.h>
63#include <asm/kvm_virtio.h>
64#include <asm/diag.h>
65#include <asm/os_info.h>
66#include "entry.h"
67
68long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
69 PSW_MASK_EA | PSW_MASK_BA;
70long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
71 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
72 PSW_MASK_PSTATE | PSW_ASC_HOME;
73
74/*
75 * User copy operations.
76 */
77struct uaccess_ops uaccess;
78EXPORT_SYMBOL(uaccess);
79
80/*
81 * Machine setup..
82 */
83unsigned int console_mode = 0;
84EXPORT_SYMBOL(console_mode);
85
86unsigned int console_devno = -1;
87EXPORT_SYMBOL(console_devno);
88
89unsigned int console_irq = -1;
90EXPORT_SYMBOL(console_irq);
91
92unsigned long elf_hwcap = 0;
93char elf_platform[ELF_PLATFORM_SIZE];
94
95struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
96
97int __initdata memory_end_set;
98unsigned long __initdata memory_end;
99
100unsigned long VMALLOC_START;
101EXPORT_SYMBOL(VMALLOC_START);
102
103unsigned long VMALLOC_END;
104EXPORT_SYMBOL(VMALLOC_END);
105
106struct page *vmemmap;
107EXPORT_SYMBOL(vmemmap);
108
109/* An array with a pointer to the lowcore of every CPU. */
110struct _lowcore *lowcore_ptr[NR_CPUS];
111EXPORT_SYMBOL(lowcore_ptr);
112
113/*
114 * This is set up by the setup-routine at boot-time
115 * for S390 need to find out, what we have to setup
116 * using address 0x10400 ...
117 */
118
119#include <asm/setup.h>
120
121/*
122 * condev= and conmode= setup parameter.
123 */
124
125static int __init condev_setup(char *str)
126{
127 int vdev;
128
129 vdev = simple_strtoul(str, &str, 0);
130 if (vdev >= 0 && vdev < 65536) {
131 console_devno = vdev;
132 console_irq = -1;
133 }
134 return 1;
135}
136
137__setup("condev=", condev_setup);
138
139static void __init set_preferred_console(void)
140{
141 if (MACHINE_IS_KVM)
142 add_preferred_console("hvc", 0, NULL);
143 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
144 add_preferred_console("ttyS", 0, NULL);
145 else if (CONSOLE_IS_3270)
146 add_preferred_console("tty3270", 0, NULL);
147}
148
149static int __init conmode_setup(char *str)
150{
151#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
152 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
153 SET_CONSOLE_SCLP;
154#endif
155#if defined(CONFIG_TN3215_CONSOLE)
156 if (strncmp(str, "3215", 5) == 0)
157 SET_CONSOLE_3215;
158#endif
159#if defined(CONFIG_TN3270_CONSOLE)
160 if (strncmp(str, "3270", 5) == 0)
161 SET_CONSOLE_3270;
162#endif
163 set_preferred_console();
164 return 1;
165}
166
167__setup("conmode=", conmode_setup);
168
169static void __init conmode_default(void)
170{
171 char query_buffer[1024];
172 char *ptr;
173
174 if (MACHINE_IS_VM) {
175 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
176 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
177 ptr = strstr(query_buffer, "SUBCHANNEL =");
178 console_irq = simple_strtoul(ptr + 13, NULL, 16);
179 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
180 ptr = strstr(query_buffer, "CONMODE");
181 /*
182 * Set the conmode to 3215 so that the device recognition
183 * will set the cu_type of the console to 3215. If the
184 * conmode is 3270 and we don't set it back then both
185 * 3215 and the 3270 driver will try to access the console
186 * device (3215 as console and 3270 as normal tty).
187 */
188 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
189 if (ptr == NULL) {
190#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
191 SET_CONSOLE_SCLP;
192#endif
193 return;
194 }
195 if (strncmp(ptr + 8, "3270", 4) == 0) {
196#if defined(CONFIG_TN3270_CONSOLE)
197 SET_CONSOLE_3270;
198#elif defined(CONFIG_TN3215_CONSOLE)
199 SET_CONSOLE_3215;
200#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 SET_CONSOLE_SCLP;
202#endif
203 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
204#if defined(CONFIG_TN3215_CONSOLE)
205 SET_CONSOLE_3215;
206#elif defined(CONFIG_TN3270_CONSOLE)
207 SET_CONSOLE_3270;
208#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 SET_CONSOLE_SCLP;
210#endif
211 }
212 } else {
213#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
214 SET_CONSOLE_SCLP;
215#endif
216 }
217}
218
219#ifdef CONFIG_ZFCPDUMP
220static void __init setup_zfcpdump(unsigned int console_devno)
221{
222 static char str[41];
223
224 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
225 return;
226 if (OLDMEM_BASE)
227 return;
228 if (console_devno != -1)
229 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
230 ipl_info.data.fcp.dev_id.devno, console_devno);
231 else
232 sprintf(str, " cio_ignore=all,!0.0.%04x",
233 ipl_info.data.fcp.dev_id.devno);
234 strcat(boot_command_line, str);
235 console_loglevel = 2;
236}
237#else
238static inline void setup_zfcpdump(unsigned int console_devno) {}
239#endif /* CONFIG_ZFCPDUMP */
240
241 /*
242 * Reboot, halt and power_off stubs. They just call _machine_restart,
243 * _machine_halt or _machine_power_off.
244 */
245
246void machine_restart(char *command)
247{
248 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
249 /*
250 * Only unblank the console if we are called in enabled
251 * context or a bust_spinlocks cleared the way for us.
252 */
253 console_unblank();
254 _machine_restart(command);
255}
256
257void machine_halt(void)
258{
259 if (!in_interrupt() || oops_in_progress)
260 /*
261 * Only unblank the console if we are called in enabled
262 * context or a bust_spinlocks cleared the way for us.
263 */
264 console_unblank();
265 _machine_halt();
266}
267
268void machine_power_off(void)
269{
270 if (!in_interrupt() || oops_in_progress)
271 /*
272 * Only unblank the console if we are called in enabled
273 * context or a bust_spinlocks cleared the way for us.
274 */
275 console_unblank();
276 _machine_power_off();
277}
278
279/*
280 * Dummy power off function.
281 */
282void (*pm_power_off)(void) = machine_power_off;
283
284static int __init early_parse_mem(char *p)
285{
286 memory_end = memparse(p, &p);
287 memory_end_set = 1;
288 return 0;
289}
290early_param("mem", early_parse_mem);
291
292static int __init parse_vmalloc(char *arg)
293{
294 if (!arg)
295 return -EINVAL;
296 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
297 return 0;
298}
299early_param("vmalloc", parse_vmalloc);
300
301unsigned int user_mode = HOME_SPACE_MODE;
302EXPORT_SYMBOL_GPL(user_mode);
303
304static int set_amode_primary(void)
305{
306 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
307 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
308#ifdef CONFIG_COMPAT
309 psw32_user_bits =
310 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
311#endif
312
313 if (MACHINE_HAS_MVCOS) {
314 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
315 return 1;
316 } else {
317 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
318 return 0;
319 }
320}
321
322/*
323 * Switch kernel/user addressing modes?
324 */
325static int __init early_parse_switch_amode(char *p)
326{
327 user_mode = PRIMARY_SPACE_MODE;
328 return 0;
329}
330early_param("switch_amode", early_parse_switch_amode);
331
332static int __init early_parse_user_mode(char *p)
333{
334 if (p && strcmp(p, "primary") == 0)
335 user_mode = PRIMARY_SPACE_MODE;
336 else if (!p || strcmp(p, "home") == 0)
337 user_mode = HOME_SPACE_MODE;
338 else
339 return 1;
340 return 0;
341}
342early_param("user_mode", early_parse_user_mode);
343
344static void setup_addressing_mode(void)
345{
346 if (user_mode == PRIMARY_SPACE_MODE) {
347 if (set_amode_primary())
348 pr_info("Address spaces switched, "
349 "mvcos available\n");
350 else
351 pr_info("Address spaces switched, "
352 "mvcos not available\n");
353 }
354}
355
356void *restart_stack __attribute__((__section__(".data")));
357
358static void __init setup_lowcore(void)
359{
360 struct _lowcore *lc;
361
362 /*
363 * Setup lowcore for boot cpu
364 */
365 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
366 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
367 lc->restart_psw.mask = psw_kernel_bits;
368 lc->restart_psw.addr =
369 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
370 lc->external_new_psw.mask = psw_kernel_bits |
371 PSW_MASK_DAT | PSW_MASK_MCHECK;
372 lc->external_new_psw.addr =
373 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
374 lc->svc_new_psw.mask = psw_kernel_bits |
375 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
376 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
377 lc->program_new_psw.mask = psw_kernel_bits |
378 PSW_MASK_DAT | PSW_MASK_MCHECK;
379 lc->program_new_psw.addr =
380 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
381 lc->mcck_new_psw.mask = psw_kernel_bits;
382 lc->mcck_new_psw.addr =
383 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
384 lc->io_new_psw.mask = psw_kernel_bits |
385 PSW_MASK_DAT | PSW_MASK_MCHECK;
386 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
387 lc->clock_comparator = -1ULL;
388 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
389 lc->async_stack = (unsigned long)
390 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
391 lc->panic_stack = (unsigned long)
392 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
393 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
394 lc->thread_info = (unsigned long) &init_thread_union;
395 lc->machine_flags = S390_lowcore.machine_flags;
396 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
397 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
398 MAX_FACILITY_BIT/8);
399#ifndef CONFIG_64BIT
400 if (MACHINE_HAS_IEEE) {
401 lc->extended_save_area_addr = (__u32)
402 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
403 /* enable extended save area */
404 __ctl_set_bit(14, 29);
405 }
406#else
407 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
408#endif
409 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
410 lc->async_enter_timer = S390_lowcore.async_enter_timer;
411 lc->exit_timer = S390_lowcore.exit_timer;
412 lc->user_timer = S390_lowcore.user_timer;
413 lc->system_timer = S390_lowcore.system_timer;
414 lc->steal_timer = S390_lowcore.steal_timer;
415 lc->last_update_timer = S390_lowcore.last_update_timer;
416 lc->last_update_clock = S390_lowcore.last_update_clock;
417 lc->ftrace_func = S390_lowcore.ftrace_func;
418
419 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
420 restart_stack += ASYNC_SIZE;
421
422 /*
423 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
424 * restart data to the absolute zero lowcore. This is necesary if
425 * PSW restart is done on an offline CPU that has lowcore zero.
426 */
427 lc->restart_stack = (unsigned long) restart_stack;
428 lc->restart_fn = (unsigned long) do_restart;
429 lc->restart_data = 0;
430 lc->restart_source = -1UL;
431
432 /* Setup absolute zero lowcore */
433 memcpy_absolute(&S390_lowcore.restart_stack, &lc->restart_stack,
434 4 * sizeof(unsigned long));
435 memcpy_absolute(&S390_lowcore.restart_psw, &lc->restart_psw,
436 sizeof(lc->restart_psw));
437
438 set_prefix((u32)(unsigned long) lc);
439 lowcore_ptr[0] = lc;
440}
441
442static struct resource code_resource = {
443 .name = "Kernel code",
444 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
445};
446
447static struct resource data_resource = {
448 .name = "Kernel data",
449 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
450};
451
452static struct resource bss_resource = {
453 .name = "Kernel bss",
454 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
455};
456
457static struct resource __initdata *standard_resources[] = {
458 &code_resource,
459 &data_resource,
460 &bss_resource,
461};
462
463static void __init setup_resources(void)
464{
465 struct resource *res, *std_res, *sub_res;
466 int i, j;
467
468 code_resource.start = (unsigned long) &_text;
469 code_resource.end = (unsigned long) &_etext - 1;
470 data_resource.start = (unsigned long) &_etext;
471 data_resource.end = (unsigned long) &_edata - 1;
472 bss_resource.start = (unsigned long) &__bss_start;
473 bss_resource.end = (unsigned long) &__bss_stop - 1;
474
475 for (i = 0; i < MEMORY_CHUNKS; i++) {
476 if (!memory_chunk[i].size)
477 continue;
478 if (memory_chunk[i].type == CHUNK_OLDMEM ||
479 memory_chunk[i].type == CHUNK_CRASHK)
480 continue;
481 res = alloc_bootmem_low(sizeof(*res));
482 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
483 switch (memory_chunk[i].type) {
484 case CHUNK_READ_WRITE:
485 case CHUNK_CRASHK:
486 res->name = "System RAM";
487 break;
488 case CHUNK_READ_ONLY:
489 res->name = "System ROM";
490 res->flags |= IORESOURCE_READONLY;
491 break;
492 default:
493 res->name = "reserved";
494 }
495 res->start = memory_chunk[i].addr;
496 res->end = res->start + memory_chunk[i].size - 1;
497 request_resource(&iomem_resource, res);
498
499 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
500 std_res = standard_resources[j];
501 if (std_res->start < res->start ||
502 std_res->start > res->end)
503 continue;
504 if (std_res->end > res->end) {
505 sub_res = alloc_bootmem_low(sizeof(*sub_res));
506 *sub_res = *std_res;
507 sub_res->end = res->end;
508 std_res->start = res->end + 1;
509 request_resource(res, sub_res);
510 } else {
511 request_resource(res, std_res);
512 }
513 }
514 }
515}
516
517unsigned long real_memory_size;
518EXPORT_SYMBOL_GPL(real_memory_size);
519
520static void __init setup_memory_end(void)
521{
522 unsigned long vmax, vmalloc_size, tmp;
523 int i;
524
525
526#ifdef CONFIG_ZFCPDUMP
527 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
528 memory_end = ZFCPDUMP_HSA_SIZE;
529 memory_end_set = 1;
530 }
531#endif
532 real_memory_size = 0;
533 memory_end &= PAGE_MASK;
534
535 /*
536 * Make sure all chunks are MAX_ORDER aligned so we don't need the
537 * extra checks that HOLES_IN_ZONE would require.
538 */
539 for (i = 0; i < MEMORY_CHUNKS; i++) {
540 unsigned long start, end;
541 struct mem_chunk *chunk;
542 unsigned long align;
543
544 chunk = &memory_chunk[i];
545 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
546 start = (chunk->addr + align - 1) & ~(align - 1);
547 end = (chunk->addr + chunk->size) & ~(align - 1);
548 if (start >= end)
549 memset(chunk, 0, sizeof(*chunk));
550 else {
551 chunk->addr = start;
552 chunk->size = end - start;
553 }
554 real_memory_size = max(real_memory_size,
555 chunk->addr + chunk->size);
556 }
557
558 /* Choose kernel address space layout: 2, 3, or 4 levels. */
559#ifdef CONFIG_64BIT
560 vmalloc_size = VMALLOC_END ?: 128UL << 30;
561 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
562 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
563 if (tmp <= (1UL << 42))
564 vmax = 1UL << 42; /* 3-level kernel page table */
565 else
566 vmax = 1UL << 53; /* 4-level kernel page table */
567#else
568 vmalloc_size = VMALLOC_END ?: 96UL << 20;
569 vmax = 1UL << 31; /* 2-level kernel page table */
570#endif
571 /* vmalloc area is at the end of the kernel address space. */
572 VMALLOC_END = vmax;
573 VMALLOC_START = vmax - vmalloc_size;
574
575 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
576 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
577 tmp = VMALLOC_START - tmp * sizeof(struct page);
578 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
579 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
580 vmemmap = (struct page *) tmp;
581
582 /* Take care that memory_end is set and <= vmemmap */
583 memory_end = min(memory_end ?: real_memory_size, tmp);
584
585 /* Fixup memory chunk array to fit into 0..memory_end */
586 for (i = 0; i < MEMORY_CHUNKS; i++) {
587 struct mem_chunk *chunk = &memory_chunk[i];
588
589 if (chunk->addr >= memory_end) {
590 memset(chunk, 0, sizeof(*chunk));
591 continue;
592 }
593 if (chunk->addr + chunk->size > memory_end)
594 chunk->size = memory_end - chunk->addr;
595 }
596}
597
598static void __init setup_vmcoreinfo(void)
599{
600#ifdef CONFIG_KEXEC
601 unsigned long ptr = paddr_vmcoreinfo_note();
602
603 memcpy_absolute(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
604#endif
605}
606
607#ifdef CONFIG_CRASH_DUMP
608
609/*
610 * Find suitable location for crashkernel memory
611 */
612static unsigned long __init find_crash_base(unsigned long crash_size,
613 char **msg)
614{
615 unsigned long crash_base;
616 struct mem_chunk *chunk;
617 int i;
618
619 if (memory_chunk[0].size < crash_size) {
620 *msg = "first memory chunk must be at least crashkernel size";
621 return 0;
622 }
623 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
624 return OLDMEM_BASE;
625
626 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
627 chunk = &memory_chunk[i];
628 if (chunk->size == 0)
629 continue;
630 if (chunk->type != CHUNK_READ_WRITE)
631 continue;
632 if (chunk->size < crash_size)
633 continue;
634 crash_base = (chunk->addr + chunk->size) - crash_size;
635 if (crash_base < crash_size)
636 continue;
637 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
638 continue;
639 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
640 continue;
641 return crash_base;
642 }
643 *msg = "no suitable area found";
644 return 0;
645}
646
647/*
648 * Check if crash_base and crash_size is valid
649 */
650static int __init verify_crash_base(unsigned long crash_base,
651 unsigned long crash_size,
652 char **msg)
653{
654 struct mem_chunk *chunk;
655 int i;
656
657 /*
658 * Because we do the swap to zero, we must have at least 'crash_size'
659 * bytes free space before crash_base
660 */
661 if (crash_size > crash_base) {
662 *msg = "crashkernel offset must be greater than size";
663 return -EINVAL;
664 }
665
666 /* First memory chunk must be at least crash_size */
667 if (memory_chunk[0].size < crash_size) {
668 *msg = "first memory chunk must be at least crashkernel size";
669 return -EINVAL;
670 }
671 /* Check if we fit into the respective memory chunk */
672 for (i = 0; i < MEMORY_CHUNKS; i++) {
673 chunk = &memory_chunk[i];
674 if (chunk->size == 0)
675 continue;
676 if (crash_base < chunk->addr)
677 continue;
678 if (crash_base >= chunk->addr + chunk->size)
679 continue;
680 /* we have found the memory chunk */
681 if (crash_base + crash_size > chunk->addr + chunk->size) {
682 *msg = "selected memory chunk is too small for "
683 "crashkernel memory";
684 return -EINVAL;
685 }
686 return 0;
687 }
688 *msg = "invalid memory range specified";
689 return -EINVAL;
690}
691
692/*
693 * Reserve kdump memory by creating a memory hole in the mem_chunk array
694 */
695static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
696 int type)
697{
698 create_mem_hole(memory_chunk, addr, size, type);
699}
700
701/*
702 * When kdump is enabled, we have to ensure that no memory from
703 * the area [0 - crashkernel memory size] and
704 * [crashk_res.start - crashk_res.end] is set offline.
705 */
706static int kdump_mem_notifier(struct notifier_block *nb,
707 unsigned long action, void *data)
708{
709 struct memory_notify *arg = data;
710
711 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
712 return NOTIFY_BAD;
713 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
714 return NOTIFY_OK;
715 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
716 return NOTIFY_OK;
717 return NOTIFY_BAD;
718}
719
720static struct notifier_block kdump_mem_nb = {
721 .notifier_call = kdump_mem_notifier,
722};
723
724#endif
725
726/*
727 * Make sure that oldmem, where the dump is stored, is protected
728 */
729static void reserve_oldmem(void)
730{
731#ifdef CONFIG_CRASH_DUMP
732 if (!OLDMEM_BASE)
733 return;
734
735 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
736 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
737 CHUNK_OLDMEM);
738 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
739 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
740 else
741 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
742#endif
743}
744
745/*
746 * Reserve memory for kdump kernel to be loaded with kexec
747 */
748static void __init reserve_crashkernel(void)
749{
750#ifdef CONFIG_CRASH_DUMP
751 unsigned long long crash_base, crash_size;
752 char *msg = NULL;
753 int rc;
754
755 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
756 &crash_base);
757 if (rc || crash_size == 0)
758 return;
759 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
760 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
761 if (register_memory_notifier(&kdump_mem_nb))
762 return;
763 if (!crash_base)
764 crash_base = find_crash_base(crash_size, &msg);
765 if (!crash_base) {
766 pr_info("crashkernel reservation failed: %s\n", msg);
767 unregister_memory_notifier(&kdump_mem_nb);
768 return;
769 }
770 if (verify_crash_base(crash_base, crash_size, &msg)) {
771 pr_info("crashkernel reservation failed: %s\n", msg);
772 unregister_memory_notifier(&kdump_mem_nb);
773 return;
774 }
775 if (!OLDMEM_BASE && MACHINE_IS_VM)
776 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
777 crashk_res.start = crash_base;
778 crashk_res.end = crash_base + crash_size - 1;
779 insert_resource(&iomem_resource, &crashk_res);
780 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
781 pr_info("Reserving %lluMB of memory at %lluMB "
782 "for crashkernel (System RAM: %luMB)\n",
783 crash_size >> 20, crash_base >> 20, memory_end >> 20);
784 os_info_crashkernel_add(crash_base, crash_size);
785#endif
786}
787
788static void __init setup_memory(void)
789{
790 unsigned long bootmap_size;
791 unsigned long start_pfn, end_pfn;
792 int i;
793
794 /*
795 * partially used pages are not usable - thus
796 * we are rounding upwards:
797 */
798 start_pfn = PFN_UP(__pa(&_end));
799 end_pfn = max_pfn = PFN_DOWN(memory_end);
800
801#ifdef CONFIG_BLK_DEV_INITRD
802 /*
803 * Move the initrd in case the bitmap of the bootmem allocater
804 * would overwrite it.
805 */
806
807 if (INITRD_START && INITRD_SIZE) {
808 unsigned long bmap_size;
809 unsigned long start;
810
811 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
812 bmap_size = PFN_PHYS(bmap_size);
813
814 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
815 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
816
817#ifdef CONFIG_CRASH_DUMP
818 if (OLDMEM_BASE) {
819 /* Move initrd behind kdump oldmem */
820 if (start + INITRD_SIZE > OLDMEM_BASE &&
821 start < OLDMEM_BASE + OLDMEM_SIZE)
822 start = OLDMEM_BASE + OLDMEM_SIZE;
823 }
824#endif
825 if (start + INITRD_SIZE > memory_end) {
826 pr_err("initrd extends beyond end of "
827 "memory (0x%08lx > 0x%08lx) "
828 "disabling initrd\n",
829 start + INITRD_SIZE, memory_end);
830 INITRD_START = INITRD_SIZE = 0;
831 } else {
832 pr_info("Moving initrd (0x%08lx -> "
833 "0x%08lx, size: %ld)\n",
834 INITRD_START, start, INITRD_SIZE);
835 memmove((void *) start, (void *) INITRD_START,
836 INITRD_SIZE);
837 INITRD_START = start;
838 }
839 }
840 }
841#endif
842
843 /*
844 * Initialize the boot-time allocator
845 */
846 bootmap_size = init_bootmem(start_pfn, end_pfn);
847
848 /*
849 * Register RAM areas with the bootmem allocator.
850 */
851
852 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
853 unsigned long start_chunk, end_chunk, pfn;
854
855 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
856 memory_chunk[i].type != CHUNK_CRASHK)
857 continue;
858 start_chunk = PFN_DOWN(memory_chunk[i].addr);
859 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
860 end_chunk = min(end_chunk, end_pfn);
861 if (start_chunk >= end_chunk)
862 continue;
863 memblock_add_node(PFN_PHYS(start_chunk),
864 PFN_PHYS(end_chunk - start_chunk), 0);
865 pfn = max(start_chunk, start_pfn);
866 for (; pfn < end_chunk; pfn++)
867 page_set_storage_key(PFN_PHYS(pfn),
868 PAGE_DEFAULT_KEY, 0);
869 }
870
871 psw_set_key(PAGE_DEFAULT_KEY);
872
873 free_bootmem_with_active_regions(0, max_pfn);
874
875 /*
876 * Reserve memory used for lowcore/command line/kernel image.
877 */
878 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
879 reserve_bootmem((unsigned long)_stext,
880 PFN_PHYS(start_pfn) - (unsigned long)_stext,
881 BOOTMEM_DEFAULT);
882 /*
883 * Reserve the bootmem bitmap itself as well. We do this in two
884 * steps (first step was init_bootmem()) because this catches
885 * the (very unlikely) case of us accidentally initializing the
886 * bootmem allocator with an invalid RAM area.
887 */
888 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
889 BOOTMEM_DEFAULT);
890
891#ifdef CONFIG_CRASH_DUMP
892 if (crashk_res.start)
893 reserve_bootmem(crashk_res.start,
894 crashk_res.end - crashk_res.start + 1,
895 BOOTMEM_DEFAULT);
896 if (is_kdump_kernel())
897 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
898 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
899#endif
900#ifdef CONFIG_BLK_DEV_INITRD
901 if (INITRD_START && INITRD_SIZE) {
902 if (INITRD_START + INITRD_SIZE <= memory_end) {
903 reserve_bootmem(INITRD_START, INITRD_SIZE,
904 BOOTMEM_DEFAULT);
905 initrd_start = INITRD_START;
906 initrd_end = initrd_start + INITRD_SIZE;
907 } else {
908 pr_err("initrd extends beyond end of "
909 "memory (0x%08lx > 0x%08lx) "
910 "disabling initrd\n",
911 initrd_start + INITRD_SIZE, memory_end);
912 initrd_start = initrd_end = 0;
913 }
914 }
915#endif
916}
917
918/*
919 * Setup hardware capabilities.
920 */
921static void __init setup_hwcaps(void)
922{
923 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
924 struct cpuid cpu_id;
925 int i;
926
927 /*
928 * The store facility list bits numbers as found in the principles
929 * of operation are numbered with bit 1UL<<31 as number 0 to
930 * bit 1UL<<0 as number 31.
931 * Bit 0: instructions named N3, "backported" to esa-mode
932 * Bit 2: z/Architecture mode is active
933 * Bit 7: the store-facility-list-extended facility is installed
934 * Bit 17: the message-security assist is installed
935 * Bit 19: the long-displacement facility is installed
936 * Bit 21: the extended-immediate facility is installed
937 * Bit 22: extended-translation facility 3 is installed
938 * Bit 30: extended-translation facility 3 enhancement facility
939 * These get translated to:
940 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
941 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
942 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
943 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
944 */
945 for (i = 0; i < 6; i++)
946 if (test_facility(stfl_bits[i]))
947 elf_hwcap |= 1UL << i;
948
949 if (test_facility(22) && test_facility(30))
950 elf_hwcap |= HWCAP_S390_ETF3EH;
951
952 /*
953 * Check for additional facilities with store-facility-list-extended.
954 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
955 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
956 * as stored by stfl, bits 32-xxx contain additional facilities.
957 * How many facility words are stored depends on the number of
958 * doublewords passed to the instruction. The additional facilities
959 * are:
960 * Bit 42: decimal floating point facility is installed
961 * Bit 44: perform floating point operation facility is installed
962 * translated to:
963 * HWCAP_S390_DFP bit 6 (42 && 44).
964 */
965 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
966 elf_hwcap |= HWCAP_S390_DFP;
967
968 /*
969 * Huge page support HWCAP_S390_HPAGE is bit 7.
970 */
971 if (MACHINE_HAS_HPAGE)
972 elf_hwcap |= HWCAP_S390_HPAGE;
973
974 /*
975 * 64-bit register support for 31-bit processes
976 * HWCAP_S390_HIGH_GPRS is bit 9.
977 */
978 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
979
980 get_cpu_id(&cpu_id);
981 switch (cpu_id.machine) {
982 case 0x9672:
983#if !defined(CONFIG_64BIT)
984 default: /* Use "g5" as default for 31 bit kernels. */
985#endif
986 strcpy(elf_platform, "g5");
987 break;
988 case 0x2064:
989 case 0x2066:
990#if defined(CONFIG_64BIT)
991 default: /* Use "z900" as default for 64 bit kernels. */
992#endif
993 strcpy(elf_platform, "z900");
994 break;
995 case 0x2084:
996 case 0x2086:
997 strcpy(elf_platform, "z990");
998 break;
999 case 0x2094:
1000 case 0x2096:
1001 strcpy(elf_platform, "z9-109");
1002 break;
1003 case 0x2097:
1004 case 0x2098:
1005 strcpy(elf_platform, "z10");
1006 break;
1007 case 0x2817:
1008 case 0x2818:
1009 strcpy(elf_platform, "z196");
1010 break;
1011 }
1012}
1013
1014/*
1015 * Setup function called from init/main.c just after the banner
1016 * was printed.
1017 */
1018
1019void __init setup_arch(char **cmdline_p)
1020{
1021 /*
1022 * print what head.S has found out about the machine
1023 */
1024#ifndef CONFIG_64BIT
1025 if (MACHINE_IS_VM)
1026 pr_info("Linux is running as a z/VM "
1027 "guest operating system in 31-bit mode\n");
1028 else if (MACHINE_IS_LPAR)
1029 pr_info("Linux is running natively in 31-bit mode\n");
1030 if (MACHINE_HAS_IEEE)
1031 pr_info("The hardware system has IEEE compatible "
1032 "floating point units\n");
1033 else
1034 pr_info("The hardware system has no IEEE compatible "
1035 "floating point units\n");
1036#else /* CONFIG_64BIT */
1037 if (MACHINE_IS_VM)
1038 pr_info("Linux is running as a z/VM "
1039 "guest operating system in 64-bit mode\n");
1040 else if (MACHINE_IS_KVM)
1041 pr_info("Linux is running under KVM in 64-bit mode\n");
1042 else if (MACHINE_IS_LPAR)
1043 pr_info("Linux is running natively in 64-bit mode\n");
1044#endif /* CONFIG_64BIT */
1045
1046 /* Have one command line that is parsed and saved in /proc/cmdline */
1047 /* boot_command_line has been already set up in early.c */
1048 *cmdline_p = boot_command_line;
1049
1050 ROOT_DEV = Root_RAM0;
1051
1052 init_mm.start_code = PAGE_OFFSET;
1053 init_mm.end_code = (unsigned long) &_etext;
1054 init_mm.end_data = (unsigned long) &_edata;
1055 init_mm.brk = (unsigned long) &_end;
1056
1057 if (MACHINE_HAS_MVCOS)
1058 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1059 else
1060 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1061
1062 parse_early_param();
1063
1064 os_info_init();
1065 setup_ipl();
1066 setup_memory_end();
1067 setup_addressing_mode();
1068 reserve_oldmem();
1069 reserve_crashkernel();
1070 setup_memory();
1071 setup_resources();
1072 setup_vmcoreinfo();
1073 setup_lowcore();
1074
1075 cpu_init();
1076 s390_init_cpu_topology();
1077
1078 /*
1079 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1080 */
1081 setup_hwcaps();
1082
1083 /*
1084 * Create kernel page tables and switch to virtual addressing.
1085 */
1086 paging_init();
1087
1088 /* Setup default console */
1089 conmode_default();
1090 set_preferred_console();
1091
1092 /* Setup zfcpdump support */
1093 setup_zfcpdump(console_devno);
1094}
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 */
84unsigned int console_mode = 0;
85EXPORT_SYMBOL(console_mode);
86
87unsigned int console_devno = -1;
88EXPORT_SYMBOL(console_devno);
89
90unsigned int console_irq = -1;
91EXPORT_SYMBOL(console_irq);
92
93unsigned long elf_hwcap __read_mostly = 0;
94char elf_platform[ELF_PLATFORM_SIZE];
95
96unsigned long int_hwcap = 0;
97
98int __bootdata(noexec_disabled);
99unsigned long __bootdata(ident_map_size);
100struct mem_detect_info __bootdata(mem_detect);
101
102struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
103struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
104unsigned long __bootdata_preserved(__stext_dma);
105unsigned long __bootdata_preserved(__etext_dma);
106unsigned long __bootdata_preserved(__sdma);
107unsigned long __bootdata_preserved(__edma);
108unsigned long __bootdata_preserved(__kaslr_offset);
109unsigned int __bootdata_preserved(zlib_dfltcc_support);
110EXPORT_SYMBOL(zlib_dfltcc_support);
111u64 __bootdata_preserved(stfle_fac_list[16]);
112EXPORT_SYMBOL(stfle_fac_list);
113u64 __bootdata_preserved(alt_stfle_fac_list[16]);
114
115unsigned long VMALLOC_START;
116EXPORT_SYMBOL(VMALLOC_START);
117
118unsigned long VMALLOC_END;
119EXPORT_SYMBOL(VMALLOC_END);
120
121struct page *vmemmap;
122EXPORT_SYMBOL(vmemmap);
123unsigned long vmemmap_size;
124
125unsigned long MODULES_VADDR;
126unsigned long MODULES_END;
127
128/* An array with a pointer to the lowcore of every CPU. */
129struct lowcore *lowcore_ptr[NR_CPUS];
130EXPORT_SYMBOL(lowcore_ptr);
131
132/*
133 * The Write Back bit position in the physaddr is given by the SLPC PCI.
134 * Leaving the mask zero always uses write through which is safe
135 */
136unsigned long mio_wb_bit_mask __ro_after_init;
137
138/*
139 * This is set up by the setup-routine at boot-time
140 * for S390 need to find out, what we have to setup
141 * using address 0x10400 ...
142 */
143
144#include <asm/setup.h>
145
146/*
147 * condev= and conmode= setup parameter.
148 */
149
150static int __init condev_setup(char *str)
151{
152 int vdev;
153
154 vdev = simple_strtoul(str, &str, 0);
155 if (vdev >= 0 && vdev < 65536) {
156 console_devno = vdev;
157 console_irq = -1;
158 }
159 return 1;
160}
161
162__setup("condev=", condev_setup);
163
164static void __init set_preferred_console(void)
165{
166 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
167 add_preferred_console("ttyS", 0, NULL);
168 else if (CONSOLE_IS_3270)
169 add_preferred_console("tty3270", 0, NULL);
170 else if (CONSOLE_IS_VT220)
171 add_preferred_console("ttysclp", 0, NULL);
172 else if (CONSOLE_IS_HVC)
173 add_preferred_console("hvc", 0, NULL);
174}
175
176static int __init conmode_setup(char *str)
177{
178#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
179 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
180 SET_CONSOLE_SCLP;
181#endif
182#if defined(CONFIG_TN3215_CONSOLE)
183 if (!strcmp(str, "3215"))
184 SET_CONSOLE_3215;
185#endif
186#if defined(CONFIG_TN3270_CONSOLE)
187 if (!strcmp(str, "3270"))
188 SET_CONSOLE_3270;
189#endif
190 set_preferred_console();
191 return 1;
192}
193
194__setup("conmode=", conmode_setup);
195
196static void __init conmode_default(void)
197{
198 char query_buffer[1024];
199 char *ptr;
200
201 if (MACHINE_IS_VM) {
202 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
203 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
204 ptr = strstr(query_buffer, "SUBCHANNEL =");
205 console_irq = simple_strtoul(ptr + 13, NULL, 16);
206 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
207 ptr = strstr(query_buffer, "CONMODE");
208 /*
209 * Set the conmode to 3215 so that the device recognition
210 * will set the cu_type of the console to 3215. If the
211 * conmode is 3270 and we don't set it back then both
212 * 3215 and the 3270 driver will try to access the console
213 * device (3215 as console and 3270 as normal tty).
214 */
215 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
216 if (ptr == NULL) {
217#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
218 SET_CONSOLE_SCLP;
219#endif
220 return;
221 }
222 if (str_has_prefix(ptr + 8, "3270")) {
223#if defined(CONFIG_TN3270_CONSOLE)
224 SET_CONSOLE_3270;
225#elif defined(CONFIG_TN3215_CONSOLE)
226 SET_CONSOLE_3215;
227#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 } else if (str_has_prefix(ptr + 8, "3215")) {
231#if defined(CONFIG_TN3215_CONSOLE)
232 SET_CONSOLE_3215;
233#elif defined(CONFIG_TN3270_CONSOLE)
234 SET_CONSOLE_3270;
235#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
236 SET_CONSOLE_SCLP;
237#endif
238 }
239 } else if (MACHINE_IS_KVM) {
240 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
241 SET_CONSOLE_VT220;
242 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
243 SET_CONSOLE_SCLP;
244 else
245 SET_CONSOLE_HVC;
246 } else {
247#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
248 SET_CONSOLE_SCLP;
249#endif
250 }
251}
252
253#ifdef CONFIG_CRASH_DUMP
254static void __init setup_zfcpdump(void)
255{
256 if (!is_ipl_type_dump())
257 return;
258 if (OLDMEM_BASE)
259 return;
260 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
261 console_loglevel = 2;
262}
263#else
264static inline void setup_zfcpdump(void) {}
265#endif /* CONFIG_CRASH_DUMP */
266
267 /*
268 * Reboot, halt and power_off stubs. They just call _machine_restart,
269 * _machine_halt or _machine_power_off.
270 */
271
272void machine_restart(char *command)
273{
274 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
275 /*
276 * Only unblank the console if we are called in enabled
277 * context or a bust_spinlocks cleared the way for us.
278 */
279 console_unblank();
280 _machine_restart(command);
281}
282
283void machine_halt(void)
284{
285 if (!in_interrupt() || oops_in_progress)
286 /*
287 * Only unblank the console if we are called in enabled
288 * context or a bust_spinlocks cleared the way for us.
289 */
290 console_unblank();
291 _machine_halt();
292}
293
294void machine_power_off(void)
295{
296 if (!in_interrupt() || oops_in_progress)
297 /*
298 * Only unblank the console if we are called in enabled
299 * context or a bust_spinlocks cleared the way for us.
300 */
301 console_unblank();
302 _machine_power_off();
303}
304
305/*
306 * Dummy power off function.
307 */
308void (*pm_power_off)(void) = machine_power_off;
309EXPORT_SYMBOL_GPL(pm_power_off);
310
311void *restart_stack;
312
313unsigned long stack_alloc(void)
314{
315#ifdef CONFIG_VMAP_STACK
316 void *ret;
317
318 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
319 NUMA_NO_NODE, __builtin_return_address(0));
320 kmemleak_not_leak(ret);
321 return (unsigned long)ret;
322#else
323 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
324#endif
325}
326
327void stack_free(unsigned long stack)
328{
329#ifdef CONFIG_VMAP_STACK
330 vfree((void *) stack);
331#else
332 free_pages(stack, THREAD_SIZE_ORDER);
333#endif
334}
335
336int __init arch_early_irq_init(void)
337{
338 unsigned long stack;
339
340 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
341 if (!stack)
342 panic("Couldn't allocate async stack");
343 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
344 return 0;
345}
346
347void __init arch_call_rest_init(void)
348{
349 unsigned long stack;
350
351 stack = stack_alloc();
352 if (!stack)
353 panic("Couldn't allocate kernel stack");
354 current->stack = (void *) stack;
355#ifdef CONFIG_VMAP_STACK
356 current->stack_vm_area = (void *) stack;
357#endif
358 set_task_stack_end_magic(current);
359 stack += STACK_INIT_OFFSET;
360 S390_lowcore.kernel_stack = stack;
361 call_on_stack_noreturn(rest_init, stack);
362}
363
364static void __init setup_lowcore_dat_off(void)
365{
366 unsigned long int_psw_mask = PSW_KERNEL_BITS;
367 unsigned long mcck_stack;
368 struct lowcore *lc;
369
370 if (IS_ENABLED(CONFIG_KASAN))
371 int_psw_mask |= PSW_MASK_DAT;
372
373 /*
374 * Setup lowcore for boot cpu
375 */
376 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
377 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
378 if (!lc)
379 panic("%s: Failed to allocate %zu bytes align=%zx\n",
380 __func__, sizeof(*lc), sizeof(*lc));
381
382 lc->restart_psw.mask = PSW_KERNEL_BITS;
383 lc->restart_psw.addr = (unsigned long) restart_int_handler;
384 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
385 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
386 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
387 lc->svc_new_psw.addr = (unsigned long) system_call;
388 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
389 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
390 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
391 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
392 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
393 lc->io_new_psw.addr = (unsigned long) io_int_handler;
394 lc->clock_comparator = clock_comparator_max;
395 lc->nodat_stack = ((unsigned long) &init_thread_union)
396 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
397 lc->current_task = (unsigned long)&init_task;
398 lc->lpp = LPP_MAGIC;
399 lc->machine_flags = S390_lowcore.machine_flags;
400 lc->preempt_count = S390_lowcore.preempt_count;
401 nmi_alloc_boot_cpu(lc);
402 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
403 lc->exit_timer = S390_lowcore.exit_timer;
404 lc->user_timer = S390_lowcore.user_timer;
405 lc->system_timer = S390_lowcore.system_timer;
406 lc->steal_timer = S390_lowcore.steal_timer;
407 lc->last_update_timer = S390_lowcore.last_update_timer;
408 lc->last_update_clock = S390_lowcore.last_update_clock;
409
410 /*
411 * Allocate the global restart stack which is the same for
412 * all CPUs in cast *one* of them does a PSW restart.
413 */
414 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
415 if (!restart_stack)
416 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
417 __func__, THREAD_SIZE, THREAD_SIZE);
418 restart_stack += STACK_INIT_OFFSET;
419
420 /*
421 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
422 * restart data to the absolute zero lowcore. This is necessary if
423 * PSW restart is done on an offline CPU that has lowcore zero.
424 */
425 lc->restart_stack = (unsigned long) restart_stack;
426 lc->restart_fn = (unsigned long) do_restart;
427 lc->restart_data = 0;
428 lc->restart_source = -1U;
429
430 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
431 if (!mcck_stack)
432 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
433 __func__, THREAD_SIZE, THREAD_SIZE);
434 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
435
436 /* Setup absolute zero lowcore */
437 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
438 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
439 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
440 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
441 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
442
443 lc->spinlock_lockval = arch_spin_lockval(0);
444 lc->spinlock_index = 0;
445 arch_spin_lock_setup(0);
446 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
447 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
448 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
449 lc->preempt_count = PREEMPT_DISABLED;
450
451 set_prefix((u32)(unsigned long) lc);
452 lowcore_ptr[0] = lc;
453}
454
455static void __init setup_lowcore_dat_on(void)
456{
457 struct lowcore *lc = lowcore_ptr[0];
458
459 __ctl_clear_bit(0, 28);
460 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
461 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
462 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
463 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
464 __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
465 __ctl_set_bit(0, 28);
466 mem_assign_absolute(S390_lowcore.restart_flags, RESTART_FLAG_CTLREGS);
467 mem_assign_absolute(S390_lowcore.program_new_psw, lc->program_new_psw);
468 memcpy_absolute(&S390_lowcore.cregs_save_area, lc->cregs_save_area,
469 sizeof(S390_lowcore.cregs_save_area));
470}
471
472static struct resource code_resource = {
473 .name = "Kernel code",
474 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
475};
476
477static struct resource data_resource = {
478 .name = "Kernel data",
479 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
480};
481
482static struct resource bss_resource = {
483 .name = "Kernel bss",
484 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
485};
486
487static struct resource __initdata *standard_resources[] = {
488 &code_resource,
489 &data_resource,
490 &bss_resource,
491};
492
493static void __init setup_resources(void)
494{
495 struct resource *res, *std_res, *sub_res;
496 phys_addr_t start, end;
497 int j;
498 u64 i;
499
500 code_resource.start = (unsigned long) _text;
501 code_resource.end = (unsigned long) _etext - 1;
502 data_resource.start = (unsigned long) _etext;
503 data_resource.end = (unsigned long) _edata - 1;
504 bss_resource.start = (unsigned long) __bss_start;
505 bss_resource.end = (unsigned long) __bss_stop - 1;
506
507 for_each_mem_range(i, &start, &end) {
508 res = memblock_alloc(sizeof(*res), 8);
509 if (!res)
510 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
511 __func__, sizeof(*res), 8);
512 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
513
514 res->name = "System RAM";
515 res->start = start;
516 /*
517 * In memblock, end points to the first byte after the
518 * range while in resourses, end points to the last byte in
519 * the range.
520 */
521 res->end = end - 1;
522 request_resource(&iomem_resource, res);
523
524 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
525 std_res = standard_resources[j];
526 if (std_res->start < res->start ||
527 std_res->start > res->end)
528 continue;
529 if (std_res->end > res->end) {
530 sub_res = memblock_alloc(sizeof(*sub_res), 8);
531 if (!sub_res)
532 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
533 __func__, sizeof(*sub_res), 8);
534 *sub_res = *std_res;
535 sub_res->end = res->end;
536 std_res->start = res->end + 1;
537 request_resource(res, sub_res);
538 } else {
539 request_resource(res, std_res);
540 }
541 }
542 }
543#ifdef CONFIG_CRASH_DUMP
544 /*
545 * Re-add removed crash kernel memory as reserved memory. This makes
546 * sure it will be mapped with the identity mapping and struct pages
547 * will be created, so it can be resized later on.
548 * However add it later since the crash kernel resource should not be
549 * part of the System RAM resource.
550 */
551 if (crashk_res.end) {
552 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
553 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
554 insert_resource(&iomem_resource, &crashk_res);
555 }
556#endif
557}
558
559static void __init setup_memory_end(void)
560{
561 memblock_remove(ident_map_size, ULONG_MAX);
562 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
563 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
564}
565
566#ifdef CONFIG_CRASH_DUMP
567
568/*
569 * When kdump is enabled, we have to ensure that no memory from the area
570 * [0 - crashkernel memory size] is set offline - it will be exchanged with
571 * the crashkernel memory region when kdump is triggered. The crashkernel
572 * memory region can never get offlined (pages are unmovable).
573 */
574static int kdump_mem_notifier(struct notifier_block *nb,
575 unsigned long action, void *data)
576{
577 struct memory_notify *arg = data;
578
579 if (action != MEM_GOING_OFFLINE)
580 return NOTIFY_OK;
581 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
582 return NOTIFY_BAD;
583 return NOTIFY_OK;
584}
585
586static struct notifier_block kdump_mem_nb = {
587 .notifier_call = kdump_mem_notifier,
588};
589
590#endif
591
592/*
593 * Make sure that the area above identity mapping is protected
594 */
595static void __init reserve_above_ident_map(void)
596{
597 memblock_reserve(ident_map_size, ULONG_MAX);
598}
599
600/*
601 * Reserve memory for kdump kernel to be loaded with kexec
602 */
603static void __init reserve_crashkernel(void)
604{
605#ifdef CONFIG_CRASH_DUMP
606 unsigned long long crash_base, crash_size;
607 phys_addr_t low, high;
608 int rc;
609
610 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
611 &crash_base);
612
613 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
614 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
615 if (rc || crash_size == 0)
616 return;
617
618 if (memblock.memory.regions[0].size < crash_size) {
619 pr_info("crashkernel reservation failed: %s\n",
620 "first memory chunk must be at least crashkernel size");
621 return;
622 }
623
624 low = crash_base ?: OLDMEM_BASE;
625 high = low + crash_size;
626 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
627 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
628 crash_base = low;
629 } else {
630 /* Find suitable area in free memory */
631 low = max_t(unsigned long, crash_size, sclp.hsa_size);
632 high = crash_base ? crash_base + crash_size : ULONG_MAX;
633
634 if (crash_base && crash_base < low) {
635 pr_info("crashkernel reservation failed: %s\n",
636 "crash_base too low");
637 return;
638 }
639 low = crash_base ?: low;
640 crash_base = memblock_find_in_range(low, high, crash_size,
641 KEXEC_CRASH_MEM_ALIGN);
642 }
643
644 if (!crash_base) {
645 pr_info("crashkernel reservation failed: %s\n",
646 "no suitable area found");
647 return;
648 }
649
650 if (register_memory_notifier(&kdump_mem_nb))
651 return;
652
653 if (!OLDMEM_BASE && MACHINE_IS_VM)
654 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
655 crashk_res.start = crash_base;
656 crashk_res.end = crash_base + crash_size - 1;
657 memblock_remove(crash_base, crash_size);
658 pr_info("Reserving %lluMB of memory at %lluMB "
659 "for crashkernel (System RAM: %luMB)\n",
660 crash_size >> 20, crash_base >> 20,
661 (unsigned long)memblock.memory.total_size >> 20);
662 os_info_crashkernel_add(crash_base, crash_size);
663#endif
664}
665
666/*
667 * Reserve the initrd from being used by memblock
668 */
669static void __init reserve_initrd(void)
670{
671#ifdef CONFIG_BLK_DEV_INITRD
672 if (!INITRD_START || !INITRD_SIZE)
673 return;
674 initrd_start = INITRD_START;
675 initrd_end = initrd_start + INITRD_SIZE;
676 memblock_reserve(INITRD_START, INITRD_SIZE);
677#endif
678}
679
680/*
681 * Reserve the memory area used to pass the certificate lists
682 */
683static void __init reserve_certificate_list(void)
684{
685 if (ipl_cert_list_addr)
686 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
687}
688
689static void __init reserve_mem_detect_info(void)
690{
691 unsigned long start, size;
692
693 get_mem_detect_reserved(&start, &size);
694 if (size)
695 memblock_reserve(start, size);
696}
697
698static void __init free_mem_detect_info(void)
699{
700 unsigned long start, size;
701
702 get_mem_detect_reserved(&start, &size);
703 if (size)
704 memblock_free(start, size);
705}
706
707static const char * __init get_mem_info_source(void)
708{
709 switch (mem_detect.info_source) {
710 case MEM_DETECT_SCLP_STOR_INFO:
711 return "sclp storage info";
712 case MEM_DETECT_DIAG260:
713 return "diag260";
714 case MEM_DETECT_SCLP_READ_INFO:
715 return "sclp read info";
716 case MEM_DETECT_BIN_SEARCH:
717 return "binary search";
718 }
719 return "none";
720}
721
722static void __init memblock_add_mem_detect_info(void)
723{
724 unsigned long start, end;
725 int i;
726
727 pr_debug("physmem info source: %s (%hhd)\n",
728 get_mem_info_source(), mem_detect.info_source);
729 /* keep memblock lists close to the kernel */
730 memblock_set_bottom_up(true);
731 for_each_mem_detect_block(i, &start, &end) {
732 memblock_add(start, end - start);
733 memblock_physmem_add(start, end - start);
734 }
735 memblock_set_bottom_up(false);
736 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
737 memblock_dump_all();
738}
739
740/*
741 * Check for initrd being in usable memory
742 */
743static void __init check_initrd(void)
744{
745#ifdef CONFIG_BLK_DEV_INITRD
746 if (INITRD_START && INITRD_SIZE &&
747 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
748 pr_err("The initial RAM disk does not fit into the memory\n");
749 memblock_free(INITRD_START, INITRD_SIZE);
750 initrd_start = initrd_end = 0;
751 }
752#endif
753}
754
755/*
756 * Reserve memory used for lowcore/command line/kernel image.
757 */
758static void __init reserve_kernel(void)
759{
760 unsigned long start_pfn = PFN_UP(__pa(_end));
761
762 memblock_reserve(0, HEAD_END);
763 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
764 - (unsigned long)_stext);
765 memblock_reserve(__sdma, __edma - __sdma);
766}
767
768static void __init setup_memory(void)
769{
770 phys_addr_t start, end;
771 u64 i;
772
773 /*
774 * Init storage key for present memory
775 */
776 for_each_mem_range(i, &start, &end)
777 storage_key_init_range(start, end);
778
779 psw_set_key(PAGE_DEFAULT_KEY);
780
781 /* Only cosmetics */
782 memblock_enforce_memory_limit(memblock_end_of_DRAM());
783}
784
785/*
786 * Setup hardware capabilities.
787 */
788static int __init setup_hwcaps(void)
789{
790 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
791 struct cpuid cpu_id;
792 int i;
793
794 /*
795 * The store facility list bits numbers as found in the principles
796 * of operation are numbered with bit 1UL<<31 as number 0 to
797 * bit 1UL<<0 as number 31.
798 * Bit 0: instructions named N3, "backported" to esa-mode
799 * Bit 2: z/Architecture mode is active
800 * Bit 7: the store-facility-list-extended facility is installed
801 * Bit 17: the message-security assist is installed
802 * Bit 19: the long-displacement facility is installed
803 * Bit 21: the extended-immediate facility is installed
804 * Bit 22: extended-translation facility 3 is installed
805 * Bit 30: extended-translation facility 3 enhancement facility
806 * These get translated to:
807 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
808 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
809 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
810 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
811 */
812 for (i = 0; i < 6; i++)
813 if (test_facility(stfl_bits[i]))
814 elf_hwcap |= 1UL << i;
815
816 if (test_facility(22) && test_facility(30))
817 elf_hwcap |= HWCAP_S390_ETF3EH;
818
819 /*
820 * Check for additional facilities with store-facility-list-extended.
821 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
822 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
823 * as stored by stfl, bits 32-xxx contain additional facilities.
824 * How many facility words are stored depends on the number of
825 * doublewords passed to the instruction. The additional facilities
826 * are:
827 * Bit 42: decimal floating point facility is installed
828 * Bit 44: perform floating point operation facility is installed
829 * translated to:
830 * HWCAP_S390_DFP bit 6 (42 && 44).
831 */
832 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
833 elf_hwcap |= HWCAP_S390_DFP;
834
835 /*
836 * Huge page support HWCAP_S390_HPAGE is bit 7.
837 */
838 if (MACHINE_HAS_EDAT1)
839 elf_hwcap |= HWCAP_S390_HPAGE;
840
841 /*
842 * 64-bit register support for 31-bit processes
843 * HWCAP_S390_HIGH_GPRS is bit 9.
844 */
845 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
846
847 /*
848 * Transactional execution support HWCAP_S390_TE is bit 10.
849 */
850 if (MACHINE_HAS_TE)
851 elf_hwcap |= HWCAP_S390_TE;
852
853 /*
854 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
855 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
856 * instead of facility bit 129.
857 */
858 if (MACHINE_HAS_VX) {
859 elf_hwcap |= HWCAP_S390_VXRS;
860 if (test_facility(134))
861 elf_hwcap |= HWCAP_S390_VXRS_BCD;
862 if (test_facility(135))
863 elf_hwcap |= HWCAP_S390_VXRS_EXT;
864 if (test_facility(148))
865 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
866 if (test_facility(152))
867 elf_hwcap |= HWCAP_S390_VXRS_PDE;
868 }
869 if (test_facility(150))
870 elf_hwcap |= HWCAP_S390_SORT;
871 if (test_facility(151))
872 elf_hwcap |= HWCAP_S390_DFLT;
873
874 /*
875 * Guarded storage support HWCAP_S390_GS is bit 12.
876 */
877 if (MACHINE_HAS_GS)
878 elf_hwcap |= HWCAP_S390_GS;
879
880 get_cpu_id(&cpu_id);
881 add_device_randomness(&cpu_id, sizeof(cpu_id));
882 switch (cpu_id.machine) {
883 case 0x2064:
884 case 0x2066:
885 default: /* Use "z900" as default for 64 bit kernels. */
886 strcpy(elf_platform, "z900");
887 break;
888 case 0x2084:
889 case 0x2086:
890 strcpy(elf_platform, "z990");
891 break;
892 case 0x2094:
893 case 0x2096:
894 strcpy(elf_platform, "z9-109");
895 break;
896 case 0x2097:
897 case 0x2098:
898 strcpy(elf_platform, "z10");
899 break;
900 case 0x2817:
901 case 0x2818:
902 strcpy(elf_platform, "z196");
903 break;
904 case 0x2827:
905 case 0x2828:
906 strcpy(elf_platform, "zEC12");
907 break;
908 case 0x2964:
909 case 0x2965:
910 strcpy(elf_platform, "z13");
911 break;
912 case 0x3906:
913 case 0x3907:
914 strcpy(elf_platform, "z14");
915 break;
916 case 0x8561:
917 case 0x8562:
918 strcpy(elf_platform, "z15");
919 break;
920 }
921
922 /*
923 * Virtualization support HWCAP_INT_SIE is bit 0.
924 */
925 if (sclp.has_sief2)
926 int_hwcap |= HWCAP_INT_SIE;
927
928 return 0;
929}
930arch_initcall(setup_hwcaps);
931
932/*
933 * Add system information as device randomness
934 */
935static void __init setup_randomness(void)
936{
937 struct sysinfo_3_2_2 *vmms;
938
939 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
940 PAGE_SIZE);
941 if (!vmms)
942 panic("Failed to allocate memory for sysinfo structure\n");
943
944 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
945 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
946 memblock_free((unsigned long) vmms, PAGE_SIZE);
947}
948
949/*
950 * Find the correct size for the task_struct. This depends on
951 * the size of the struct fpu at the end of the thread_struct
952 * which is embedded in the task_struct.
953 */
954static void __init setup_task_size(void)
955{
956 int task_size = sizeof(struct task_struct);
957
958 if (!MACHINE_HAS_VX) {
959 task_size -= sizeof(__vector128) * __NUM_VXRS;
960 task_size += sizeof(freg_t) * __NUM_FPRS;
961 }
962 arch_task_struct_size = task_size;
963}
964
965/*
966 * Issue diagnose 318 to set the control program name and
967 * version codes.
968 */
969static void __init setup_control_program_code(void)
970{
971 union diag318_info diag318_info = {
972 .cpnc = CPNC_LINUX,
973 .cpvc = 0,
974 };
975
976 if (!sclp.has_diag318)
977 return;
978
979 diag_stat_inc(DIAG_STAT_X318);
980 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
981}
982
983/*
984 * Print the component list from the IPL report
985 */
986static void __init log_component_list(void)
987{
988 struct ipl_rb_component_entry *ptr, *end;
989 char *str;
990
991 if (!early_ipl_comp_list_addr)
992 return;
993 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
994 pr_info("Linux is running with Secure-IPL enabled\n");
995 else
996 pr_info("Linux is running with Secure-IPL disabled\n");
997 ptr = (void *) early_ipl_comp_list_addr;
998 end = (void *) ptr + early_ipl_comp_list_size;
999 pr_info("The IPL report contains the following components:\n");
1000 while (ptr < end) {
1001 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1002 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1003 str = "signed, verified";
1004 else
1005 str = "signed, verification failed";
1006 } else {
1007 str = "not signed";
1008 }
1009 pr_info("%016llx - %016llx (%s)\n",
1010 ptr->addr, ptr->addr + ptr->len, str);
1011 ptr++;
1012 }
1013}
1014
1015/*
1016 * Setup function called from init/main.c just after the banner
1017 * was printed.
1018 */
1019
1020void __init setup_arch(char **cmdline_p)
1021{
1022 /*
1023 * print what head.S has found out about the machine
1024 */
1025 if (MACHINE_IS_VM)
1026 pr_info("Linux is running as a z/VM "
1027 "guest operating system in 64-bit mode\n");
1028 else if (MACHINE_IS_KVM)
1029 pr_info("Linux is running under KVM in 64-bit mode\n");
1030 else if (MACHINE_IS_LPAR)
1031 pr_info("Linux is running natively in 64-bit mode\n");
1032 else
1033 pr_info("Linux is running as a guest in 64-bit mode\n");
1034
1035 log_component_list();
1036
1037 /* Have one command line that is parsed and saved in /proc/cmdline */
1038 /* boot_command_line has been already set up in early.c */
1039 *cmdline_p = boot_command_line;
1040
1041 ROOT_DEV = Root_RAM0;
1042
1043 setup_initial_init_mm(_text, _etext, _edata, _end);
1044
1045 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1046 nospec_auto_detect();
1047
1048 jump_label_init();
1049 parse_early_param();
1050#ifdef CONFIG_CRASH_DUMP
1051 /* Deactivate elfcorehdr= kernel parameter */
1052 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1053#endif
1054
1055 os_info_init();
1056 setup_ipl();
1057 setup_task_size();
1058 setup_control_program_code();
1059
1060 /* Do some memory reservations *before* memory is added to memblock */
1061 reserve_above_ident_map();
1062 reserve_kernel();
1063 reserve_initrd();
1064 reserve_certificate_list();
1065 reserve_mem_detect_info();
1066 memblock_allow_resize();
1067
1068 /* Get information about *all* installed memory */
1069 memblock_add_mem_detect_info();
1070
1071 free_mem_detect_info();
1072
1073 setup_uv();
1074 setup_memory_end();
1075 setup_memory();
1076 dma_contiguous_reserve(ident_map_size);
1077 vmcp_cma_reserve();
1078 if (MACHINE_HAS_EDAT2)
1079 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1080
1081 check_initrd();
1082 reserve_crashkernel();
1083#ifdef CONFIG_CRASH_DUMP
1084 /*
1085 * Be aware that smp_save_dump_cpus() triggers a system reset.
1086 * Therefore CPU and device initialization should be done afterwards.
1087 */
1088 smp_save_dump_cpus();
1089#endif
1090
1091 setup_resources();
1092 setup_lowcore_dat_off();
1093 smp_fill_possible_mask();
1094 cpu_detect_mhz_feature();
1095 cpu_init();
1096 numa_setup();
1097 smp_detect_cpus();
1098 topology_init_early();
1099
1100 /*
1101 * Create kernel page tables and switch to virtual addressing.
1102 */
1103 paging_init();
1104
1105 /*
1106 * After paging_init created the kernel page table, the new PSWs
1107 * in lowcore can now run with DAT enabled.
1108 */
1109 setup_lowcore_dat_on();
1110
1111 /* Setup default console */
1112 conmode_default();
1113 set_preferred_console();
1114
1115 apply_alternative_instructions();
1116 if (IS_ENABLED(CONFIG_EXPOLINE))
1117 nospec_init_branches();
1118
1119 /* Setup zfcp/nvme dump support */
1120 setup_zfcpdump();
1121
1122 /* Add system specific data to the random pool */
1123 setup_randomness();
1124}