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15#define KMSG_COMPONENT "setup"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/errno.h>
19#include <linux/export.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/memblock.h>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/ptrace.h>
27#include <linux/user.h>
28#include <linux/tty.h>
29#include <linux/ioport.h>
30#include <linux/delay.h>
31#include <linux/init.h>
32#include <linux/initrd.h>
33#include <linux/bootmem.h>
34#include <linux/root_dev.h>
35#include <linux/console.h>
36#include <linux/kernel_stat.h>
37#include <linux/device.h>
38#include <linux/notifier.h>
39#include <linux/pfn.h>
40#include <linux/ctype.h>
41#include <linux/reboot.h>
42#include <linux/topology.h>
43#include <linux/ftrace.h>
44#include <linux/kexec.h>
45#include <linux/crash_dump.h>
46#include <linux/memory.h>
47#include <linux/compat.h>
48
49#include <asm/ipl.h>
50#include <asm/uaccess.h>
51#include <asm/facility.h>
52#include <asm/smp.h>
53#include <asm/mmu_context.h>
54#include <asm/cpcmd.h>
55#include <asm/lowcore.h>
56#include <asm/irq.h>
57#include <asm/page.h>
58#include <asm/ptrace.h>
59#include <asm/sections.h>
60#include <asm/ebcdic.h>
61#include <asm/kvm_virtio.h>
62#include <asm/diag.h>
63#include <asm/os_info.h>
64#include <asm/sclp.h>
65#include "entry.h"
66
67long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
68 PSW_MASK_EA | PSW_MASK_BA;
69long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
70 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
71 PSW_MASK_PSTATE | PSW_ASC_HOME;
72
73
74
75
76struct uaccess_ops uaccess;
77EXPORT_SYMBOL(uaccess);
78
79
80
81
82unsigned int console_mode = 0;
83EXPORT_SYMBOL(console_mode);
84
85unsigned int console_devno = -1;
86EXPORT_SYMBOL(console_devno);
87
88unsigned int console_irq = -1;
89EXPORT_SYMBOL(console_irq);
90
91unsigned long elf_hwcap = 0;
92char elf_platform[ELF_PLATFORM_SIZE];
93
94struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
95
96int __initdata memory_end_set;
97unsigned long __initdata memory_end;
98
99unsigned long VMALLOC_START;
100EXPORT_SYMBOL(VMALLOC_START);
101
102unsigned long VMALLOC_END;
103EXPORT_SYMBOL(VMALLOC_END);
104
105struct page *vmemmap;
106EXPORT_SYMBOL(vmemmap);
107
108#ifdef CONFIG_64BIT
109unsigned long MODULES_VADDR;
110unsigned long MODULES_END;
111#endif
112
113
114struct _lowcore *lowcore_ptr[NR_CPUS];
115EXPORT_SYMBOL(lowcore_ptr);
116
117
118
119
120
121
122
123#include <asm/setup.h>
124
125
126
127
128
129static int __init condev_setup(char *str)
130{
131 int vdev;
132
133 vdev = simple_strtoul(str, &str, 0);
134 if (vdev >= 0 && vdev < 65536) {
135 console_devno = vdev;
136 console_irq = -1;
137 }
138 return 1;
139}
140
141__setup("condev=", condev_setup);
142
143static void __init set_preferred_console(void)
144{
145 if (MACHINE_IS_KVM) {
146 if (sclp_has_vt220())
147 add_preferred_console("ttyS", 1, NULL);
148 else if (sclp_has_linemode())
149 add_preferred_console("ttyS", 0, NULL);
150 else
151 add_preferred_console("hvc", 0, NULL);
152 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
153 add_preferred_console("ttyS", 0, NULL);
154 else if (CONSOLE_IS_3270)
155 add_preferred_console("tty3270", 0, NULL);
156}
157
158static int __init conmode_setup(char *str)
159{
160#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
161 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
162 SET_CONSOLE_SCLP;
163#endif
164#if defined(CONFIG_TN3215_CONSOLE)
165 if (strncmp(str, "3215", 5) == 0)
166 SET_CONSOLE_3215;
167#endif
168#if defined(CONFIG_TN3270_CONSOLE)
169 if (strncmp(str, "3270", 5) == 0)
170 SET_CONSOLE_3270;
171#endif
172 set_preferred_console();
173 return 1;
174}
175
176__setup("conmode=", conmode_setup);
177
178static void __init conmode_default(void)
179{
180 char query_buffer[1024];
181 char *ptr;
182
183 if (MACHINE_IS_VM) {
184 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
185 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
186 ptr = strstr(query_buffer, "SUBCHANNEL =");
187 console_irq = simple_strtoul(ptr + 13, NULL, 16);
188 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
189 ptr = strstr(query_buffer, "CONMODE");
190
191
192
193
194
195
196
197 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
198 if (ptr == NULL) {
199#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
200 SET_CONSOLE_SCLP;
201#endif
202 return;
203 }
204 if (strncmp(ptr + 8, "3270", 4) == 0) {
205#if defined(CONFIG_TN3270_CONSOLE)
206 SET_CONSOLE_3270;
207#elif defined(CONFIG_TN3215_CONSOLE)
208 SET_CONSOLE_3215;
209#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 SET_CONSOLE_SCLP;
211#endif
212 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
213#if defined(CONFIG_TN3215_CONSOLE)
214 SET_CONSOLE_3215;
215#elif defined(CONFIG_TN3270_CONSOLE)
216 SET_CONSOLE_3270;
217#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
218 SET_CONSOLE_SCLP;
219#endif
220 }
221 } else {
222#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
223 SET_CONSOLE_SCLP;
224#endif
225 }
226}
227
228#ifdef CONFIG_ZFCPDUMP
229static void __init setup_zfcpdump(void)
230{
231 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
232 return;
233 if (OLDMEM_BASE)
234 return;
235 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
236 console_loglevel = 2;
237}
238#else
239static inline void setup_zfcpdump(void) {}
240#endif
241
242
243
244
245
246
247void machine_restart(char *command)
248{
249 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
250
251
252
253
254 console_unblank();
255 _machine_restart(command);
256}
257
258void machine_halt(void)
259{
260 if (!in_interrupt() || oops_in_progress)
261
262
263
264
265 console_unblank();
266 _machine_halt();
267}
268
269void machine_power_off(void)
270{
271 if (!in_interrupt() || oops_in_progress)
272
273
274
275
276 console_unblank();
277 _machine_power_off();
278}
279
280
281
282
283void (*pm_power_off)(void) = machine_power_off;
284EXPORT_SYMBOL_GPL(pm_power_off);
285
286static int __init early_parse_mem(char *p)
287{
288 memory_end = memparse(p, &p);
289 memory_end_set = 1;
290 return 0;
291}
292early_param("mem", early_parse_mem);
293
294static int __init parse_vmalloc(char *arg)
295{
296 if (!arg)
297 return -EINVAL;
298 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
299 return 0;
300}
301early_param("vmalloc", parse_vmalloc);
302
303unsigned int s390_user_mode = PRIMARY_SPACE_MODE;
304EXPORT_SYMBOL_GPL(s390_user_mode);
305
306static void __init set_user_mode_primary(void)
307{
308 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
309 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
310#ifdef CONFIG_COMPAT
311 psw32_user_bits =
312 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
313#endif
314 uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt;
315}
316
317static int __init early_parse_user_mode(char *p)
318{
319 if (p && strcmp(p, "primary") == 0)
320 s390_user_mode = PRIMARY_SPACE_MODE;
321 else if (!p || strcmp(p, "home") == 0)
322 s390_user_mode = HOME_SPACE_MODE;
323 else
324 return 1;
325 return 0;
326}
327early_param("user_mode", early_parse_user_mode);
328
329static void __init setup_addressing_mode(void)
330{
331 if (s390_user_mode != PRIMARY_SPACE_MODE)
332 return;
333 set_user_mode_primary();
334 if (MACHINE_HAS_MVCOS)
335 pr_info("Address spaces switched, mvcos available\n");
336 else
337 pr_info("Address spaces switched, mvcos not available\n");
338}
339
340void *restart_stack __attribute__((__section__(".data")));
341
342static void __init setup_lowcore(void)
343{
344 struct _lowcore *lc;
345
346
347
348
349 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
350 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
351 lc->restart_psw.mask = psw_kernel_bits;
352 lc->restart_psw.addr =
353 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
354 lc->external_new_psw.mask = psw_kernel_bits |
355 PSW_MASK_DAT | PSW_MASK_MCHECK;
356 lc->external_new_psw.addr =
357 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
358 lc->svc_new_psw.mask = psw_kernel_bits |
359 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
360 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
361 lc->program_new_psw.mask = psw_kernel_bits |
362 PSW_MASK_DAT | PSW_MASK_MCHECK;
363 lc->program_new_psw.addr =
364 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
365 lc->mcck_new_psw.mask = psw_kernel_bits;
366 lc->mcck_new_psw.addr =
367 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
368 lc->io_new_psw.mask = psw_kernel_bits |
369 PSW_MASK_DAT | PSW_MASK_MCHECK;
370 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
371 lc->clock_comparator = -1ULL;
372 lc->kernel_stack = ((unsigned long) &init_thread_union)
373 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
374 lc->async_stack = (unsigned long)
375 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
376 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
377 lc->panic_stack = (unsigned long)
378 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
379 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
380 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
381 lc->thread_info = (unsigned long) &init_thread_union;
382 lc->machine_flags = S390_lowcore.machine_flags;
383 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
384 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
385 MAX_FACILITY_BIT/8);
386#ifndef CONFIG_64BIT
387 if (MACHINE_HAS_IEEE) {
388 lc->extended_save_area_addr = (__u32)
389 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
390
391 __ctl_set_bit(14, 29);
392 }
393#else
394 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
395#endif
396 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
397 lc->async_enter_timer = S390_lowcore.async_enter_timer;
398 lc->exit_timer = S390_lowcore.exit_timer;
399 lc->user_timer = S390_lowcore.user_timer;
400 lc->system_timer = S390_lowcore.system_timer;
401 lc->steal_timer = S390_lowcore.steal_timer;
402 lc->last_update_timer = S390_lowcore.last_update_timer;
403 lc->last_update_clock = S390_lowcore.last_update_clock;
404 lc->ftrace_func = S390_lowcore.ftrace_func;
405
406 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
407 restart_stack += ASYNC_SIZE;
408
409
410
411
412
413
414 lc->restart_stack = (unsigned long) restart_stack;
415 lc->restart_fn = (unsigned long) do_restart;
416 lc->restart_data = 0;
417 lc->restart_source = -1UL;
418
419
420 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
421 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
422 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
423 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
424 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
425
426 set_prefix((u32)(unsigned long) lc);
427 lowcore_ptr[0] = lc;
428}
429
430static struct resource code_resource = {
431 .name = "Kernel code",
432 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
433};
434
435static struct resource data_resource = {
436 .name = "Kernel data",
437 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
438};
439
440static struct resource bss_resource = {
441 .name = "Kernel bss",
442 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
443};
444
445static struct resource __initdata *standard_resources[] = {
446 &code_resource,
447 &data_resource,
448 &bss_resource,
449};
450
451static void __init setup_resources(void)
452{
453 struct resource *res, *std_res, *sub_res;
454 int i, j;
455
456 code_resource.start = (unsigned long) &_text;
457 code_resource.end = (unsigned long) &_etext - 1;
458 data_resource.start = (unsigned long) &_etext;
459 data_resource.end = (unsigned long) &_edata - 1;
460 bss_resource.start = (unsigned long) &__bss_start;
461 bss_resource.end = (unsigned long) &__bss_stop - 1;
462
463 for (i = 0; i < MEMORY_CHUNKS; i++) {
464 if (!memory_chunk[i].size)
465 continue;
466 res = alloc_bootmem_low(sizeof(*res));
467 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
468 switch (memory_chunk[i].type) {
469 case CHUNK_READ_WRITE:
470 res->name = "System RAM";
471 break;
472 case CHUNK_READ_ONLY:
473 res->name = "System ROM";
474 res->flags |= IORESOURCE_READONLY;
475 break;
476 default:
477 res->name = "reserved";
478 }
479 res->start = memory_chunk[i].addr;
480 res->end = res->start + memory_chunk[i].size - 1;
481 request_resource(&iomem_resource, res);
482
483 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
484 std_res = standard_resources[j];
485 if (std_res->start < res->start ||
486 std_res->start > res->end)
487 continue;
488 if (std_res->end > res->end) {
489 sub_res = alloc_bootmem_low(sizeof(*sub_res));
490 *sub_res = *std_res;
491 sub_res->end = res->end;
492 std_res->start = res->end + 1;
493 request_resource(res, sub_res);
494 } else {
495 request_resource(res, std_res);
496 }
497 }
498 }
499}
500
501static void __init setup_memory_end(void)
502{
503 unsigned long vmax, vmalloc_size, tmp;
504 unsigned long real_memory_size = 0;
505 int i;
506
507
508#ifdef CONFIG_ZFCPDUMP
509 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
510 memory_end = ZFCPDUMP_HSA_SIZE;
511 memory_end_set = 1;
512 }
513#endif
514 memory_end &= PAGE_MASK;
515
516
517
518
519
520 for (i = 0; i < MEMORY_CHUNKS; i++) {
521 unsigned long start, end;
522 struct mem_chunk *chunk;
523 unsigned long align;
524
525 chunk = &memory_chunk[i];
526 if (!chunk->size)
527 continue;
528 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
529 start = (chunk->addr + align - 1) & ~(align - 1);
530 end = (chunk->addr + chunk->size) & ~(align - 1);
531 if (start >= end)
532 memset(chunk, 0, sizeof(*chunk));
533 else {
534 chunk->addr = start;
535 chunk->size = end - start;
536 }
537 real_memory_size = max(real_memory_size,
538 chunk->addr + chunk->size);
539 }
540
541
542#ifdef CONFIG_64BIT
543 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
544 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
545 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
546 if (tmp <= (1UL << 42))
547 vmax = 1UL << 42;
548 else
549 vmax = 1UL << 53;
550
551 MODULES_END = vmax;
552 MODULES_VADDR = MODULES_END - MODULES_LEN;
553 VMALLOC_END = MODULES_VADDR;
554#else
555 vmalloc_size = VMALLOC_END ?: 96UL << 20;
556 vmax = 1UL << 31;
557
558 VMALLOC_END = vmax;
559#endif
560 VMALLOC_START = vmax - vmalloc_size;
561
562
563 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
564
565 tmp = SECTION_ALIGN_UP(tmp);
566 tmp = VMALLOC_START - tmp * sizeof(struct page);
567 tmp &= ~((vmax >> 11) - 1);
568 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
569 vmemmap = (struct page *) tmp;
570
571
572 memory_end = min(memory_end ?: real_memory_size, tmp);
573
574
575 for (i = 0; i < MEMORY_CHUNKS; i++) {
576 struct mem_chunk *chunk = &memory_chunk[i];
577
578 if (!chunk->size)
579 continue;
580 if (chunk->addr >= memory_end) {
581 memset(chunk, 0, sizeof(*chunk));
582 continue;
583 }
584 if (chunk->addr + chunk->size > memory_end)
585 chunk->size = memory_end - chunk->addr;
586 }
587}
588
589static void __init setup_vmcoreinfo(void)
590{
591 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
592}
593
594#ifdef CONFIG_CRASH_DUMP
595
596
597
598
599static unsigned long __init find_crash_base(unsigned long crash_size,
600 char **msg)
601{
602 unsigned long crash_base;
603 struct mem_chunk *chunk;
604 int i;
605
606 if (memory_chunk[0].size < crash_size) {
607 *msg = "first memory chunk must be at least crashkernel size";
608 return 0;
609 }
610 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
611 return OLDMEM_BASE;
612
613 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
614 chunk = &memory_chunk[i];
615 if (chunk->size == 0)
616 continue;
617 if (chunk->type != CHUNK_READ_WRITE)
618 continue;
619 if (chunk->size < crash_size)
620 continue;
621 crash_base = (chunk->addr + chunk->size) - crash_size;
622 if (crash_base < crash_size)
623 continue;
624 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
625 continue;
626 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
627 continue;
628 return crash_base;
629 }
630 *msg = "no suitable area found";
631 return 0;
632}
633
634
635
636
637static int __init verify_crash_base(unsigned long crash_base,
638 unsigned long crash_size,
639 char **msg)
640{
641 struct mem_chunk *chunk;
642 int i;
643
644
645
646
647
648 if (crash_size > crash_base) {
649 *msg = "crashkernel offset must be greater than size";
650 return -EINVAL;
651 }
652
653
654 if (memory_chunk[0].size < crash_size) {
655 *msg = "first memory chunk must be at least crashkernel size";
656 return -EINVAL;
657 }
658
659 for (i = 0; i < MEMORY_CHUNKS; i++) {
660 chunk = &memory_chunk[i];
661 if (chunk->size == 0)
662 continue;
663 if (crash_base < chunk->addr)
664 continue;
665 if (crash_base >= chunk->addr + chunk->size)
666 continue;
667
668 if (crash_base + crash_size > chunk->addr + chunk->size) {
669 *msg = "selected memory chunk is too small for "
670 "crashkernel memory";
671 return -EINVAL;
672 }
673 return 0;
674 }
675 *msg = "invalid memory range specified";
676 return -EINVAL;
677}
678
679
680
681
682
683
684static int kdump_mem_notifier(struct notifier_block *nb,
685 unsigned long action, void *data)
686{
687 struct memory_notify *arg = data;
688
689 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
690 return NOTIFY_BAD;
691 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
692 return NOTIFY_OK;
693 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
694 return NOTIFY_OK;
695 return NOTIFY_BAD;
696}
697
698static struct notifier_block kdump_mem_nb = {
699 .notifier_call = kdump_mem_notifier,
700};
701
702#endif
703
704
705
706
707static void reserve_oldmem(void)
708{
709#ifdef CONFIG_CRASH_DUMP
710 unsigned long real_size = 0;
711 int i;
712
713 if (!OLDMEM_BASE)
714 return;
715 for (i = 0; i < MEMORY_CHUNKS; i++) {
716 struct mem_chunk *chunk = &memory_chunk[i];
717
718 real_size = max(real_size, chunk->addr + chunk->size);
719 }
720 create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE);
721 create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE);
722#endif
723}
724
725
726
727
728static void __init reserve_crashkernel(void)
729{
730#ifdef CONFIG_CRASH_DUMP
731 unsigned long long crash_base, crash_size;
732 char *msg = NULL;
733 int rc;
734
735 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
736 &crash_base);
737 if (rc || crash_size == 0)
738 return;
739 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
740 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
741 if (register_memory_notifier(&kdump_mem_nb))
742 return;
743 if (!crash_base)
744 crash_base = find_crash_base(crash_size, &msg);
745 if (!crash_base) {
746 pr_info("crashkernel reservation failed: %s\n", msg);
747 unregister_memory_notifier(&kdump_mem_nb);
748 return;
749 }
750 if (verify_crash_base(crash_base, crash_size, &msg)) {
751 pr_info("crashkernel reservation failed: %s\n", msg);
752 unregister_memory_notifier(&kdump_mem_nb);
753 return;
754 }
755 if (!OLDMEM_BASE && MACHINE_IS_VM)
756 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
757 crashk_res.start = crash_base;
758 crashk_res.end = crash_base + crash_size - 1;
759 insert_resource(&iomem_resource, &crashk_res);
760 create_mem_hole(memory_chunk, crash_base, crash_size);
761 pr_info("Reserving %lluMB of memory at %lluMB "
762 "for crashkernel (System RAM: %luMB)\n",
763 crash_size >> 20, crash_base >> 20, memory_end >> 20);
764 os_info_crashkernel_add(crash_base, crash_size);
765#endif
766}
767
768static void __init setup_memory(void)
769{
770 unsigned long bootmap_size;
771 unsigned long start_pfn, end_pfn;
772 int i;
773
774
775
776
777
778 start_pfn = PFN_UP(__pa(&_end));
779 end_pfn = max_pfn = PFN_DOWN(memory_end);
780
781#ifdef CONFIG_BLK_DEV_INITRD
782
783
784
785
786
787 if (INITRD_START && INITRD_SIZE) {
788 unsigned long bmap_size;
789 unsigned long start;
790
791 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
792 bmap_size = PFN_PHYS(bmap_size);
793
794 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
795 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
796
797#ifdef CONFIG_CRASH_DUMP
798 if (OLDMEM_BASE) {
799
800 if (start + INITRD_SIZE > OLDMEM_BASE &&
801 start < OLDMEM_BASE + OLDMEM_SIZE)
802 start = OLDMEM_BASE + OLDMEM_SIZE;
803 }
804#endif
805 if (start + INITRD_SIZE > memory_end) {
806 pr_err("initrd extends beyond end of "
807 "memory (0x%08lx > 0x%08lx) "
808 "disabling initrd\n",
809 start + INITRD_SIZE, memory_end);
810 INITRD_START = INITRD_SIZE = 0;
811 } else {
812 pr_info("Moving initrd (0x%08lx -> "
813 "0x%08lx, size: %ld)\n",
814 INITRD_START, start, INITRD_SIZE);
815 memmove((void *) start, (void *) INITRD_START,
816 INITRD_SIZE);
817 INITRD_START = start;
818 }
819 }
820 }
821#endif
822
823
824
825
826 bootmap_size = init_bootmem(start_pfn, end_pfn);
827
828
829
830
831
832 for (i = 0; i < MEMORY_CHUNKS; i++) {
833 unsigned long start_chunk, end_chunk, pfn;
834
835 if (!memory_chunk[i].size)
836 continue;
837 start_chunk = PFN_DOWN(memory_chunk[i].addr);
838 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
839 end_chunk = min(end_chunk, end_pfn);
840 if (start_chunk >= end_chunk)
841 continue;
842 memblock_add_node(PFN_PHYS(start_chunk),
843 PFN_PHYS(end_chunk - start_chunk), 0);
844 pfn = max(start_chunk, start_pfn);
845 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
846 }
847
848 psw_set_key(PAGE_DEFAULT_KEY);
849
850 free_bootmem_with_active_regions(0, max_pfn);
851
852
853
854
855 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
856 reserve_bootmem((unsigned long)_stext,
857 PFN_PHYS(start_pfn) - (unsigned long)_stext,
858 BOOTMEM_DEFAULT);
859
860
861
862
863
864
865 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
866 BOOTMEM_DEFAULT);
867
868#ifdef CONFIG_CRASH_DUMP
869 if (crashk_res.start)
870 reserve_bootmem(crashk_res.start,
871 crashk_res.end - crashk_res.start + 1,
872 BOOTMEM_DEFAULT);
873 if (is_kdump_kernel())
874 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
875 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
876#endif
877#ifdef CONFIG_BLK_DEV_INITRD
878 if (INITRD_START && INITRD_SIZE) {
879 if (INITRD_START + INITRD_SIZE <= memory_end) {
880 reserve_bootmem(INITRD_START, INITRD_SIZE,
881 BOOTMEM_DEFAULT);
882 initrd_start = INITRD_START;
883 initrd_end = initrd_start + INITRD_SIZE;
884 } else {
885 pr_err("initrd extends beyond end of "
886 "memory (0x%08lx > 0x%08lx) "
887 "disabling initrd\n",
888 initrd_start + INITRD_SIZE, memory_end);
889 initrd_start = initrd_end = 0;
890 }
891 }
892#endif
893}
894
895
896
897
898static void __init setup_hwcaps(void)
899{
900 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
901 struct cpuid cpu_id;
902 int i;
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922 for (i = 0; i < 6; i++)
923 if (test_facility(stfl_bits[i]))
924 elf_hwcap |= 1UL << i;
925
926 if (test_facility(22) && test_facility(30))
927 elf_hwcap |= HWCAP_S390_ETF3EH;
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
943 elf_hwcap |= HWCAP_S390_DFP;
944
945
946
947
948 if (MACHINE_HAS_HPAGE)
949 elf_hwcap |= HWCAP_S390_HPAGE;
950
951#if defined(CONFIG_64BIT)
952
953
954
955
956 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
957
958
959
960
961 if (test_facility(50) && test_facility(73))
962 elf_hwcap |= HWCAP_S390_TE;
963#endif
964
965 get_cpu_id(&cpu_id);
966 switch (cpu_id.machine) {
967 case 0x9672:
968#if !defined(CONFIG_64BIT)
969 default:
970#endif
971 strcpy(elf_platform, "g5");
972 break;
973 case 0x2064:
974 case 0x2066:
975#if defined(CONFIG_64BIT)
976 default:
977#endif
978 strcpy(elf_platform, "z900");
979 break;
980 case 0x2084:
981 case 0x2086:
982 strcpy(elf_platform, "z990");
983 break;
984 case 0x2094:
985 case 0x2096:
986 strcpy(elf_platform, "z9-109");
987 break;
988 case 0x2097:
989 case 0x2098:
990 strcpy(elf_platform, "z10");
991 break;
992 case 0x2817:
993 case 0x2818:
994 strcpy(elf_platform, "z196");
995 break;
996 case 0x2827:
997 case 0x2828:
998 strcpy(elf_platform, "zEC12");
999 break;
1000 }
1001}
1002
1003
1004
1005
1006
1007
1008void __init setup_arch(char **cmdline_p)
1009{
1010
1011
1012
1013#ifndef CONFIG_64BIT
1014 if (MACHINE_IS_VM)
1015 pr_info("Linux is running as a z/VM "
1016 "guest operating system in 31-bit mode\n");
1017 else if (MACHINE_IS_LPAR)
1018 pr_info("Linux is running natively in 31-bit mode\n");
1019 if (MACHINE_HAS_IEEE)
1020 pr_info("The hardware system has IEEE compatible "
1021 "floating point units\n");
1022 else
1023 pr_info("The hardware system has no IEEE compatible "
1024 "floating point units\n");
1025#else
1026 if (MACHINE_IS_VM)
1027 pr_info("Linux is running as a z/VM "
1028 "guest operating system in 64-bit mode\n");
1029 else if (MACHINE_IS_KVM)
1030 pr_info("Linux is running under KVM in 64-bit mode\n");
1031 else if (MACHINE_IS_LPAR)
1032 pr_info("Linux is running natively in 64-bit mode\n");
1033#endif
1034
1035
1036
1037 *cmdline_p = boot_command_line;
1038
1039 ROOT_DEV = Root_RAM0;
1040
1041 init_mm.start_code = PAGE_OFFSET;
1042 init_mm.end_code = (unsigned long) &_etext;
1043 init_mm.end_data = (unsigned long) &_edata;
1044 init_mm.brk = (unsigned long) &_end;
1045
1046 if (MACHINE_HAS_MVCOS)
1047 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1048 else
1049 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1050
1051 parse_early_param();
1052 detect_memory_layout(memory_chunk, memory_end);
1053 os_info_init();
1054 setup_ipl();
1055 reserve_oldmem();
1056 setup_memory_end();
1057 setup_addressing_mode();
1058 reserve_crashkernel();
1059 setup_memory();
1060 setup_resources();
1061 setup_vmcoreinfo();
1062 setup_lowcore();
1063
1064 cpu_init();
1065 s390_init_cpu_topology();
1066
1067
1068
1069
1070 setup_hwcaps();
1071
1072
1073
1074
1075 paging_init();
1076
1077
1078 conmode_default();
1079 set_preferred_console();
1080
1081
1082 setup_zfcpdump();
1083}
1084