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1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
9 */
10
11/*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
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/random.h>
28#include <linux/user.h>
29#include <linux/tty.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/kernel_stat.h>
38#include <linux/dma-contiguous.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/kexec.h>
46#include <linux/crash_dump.h>
47#include <linux/memory.h>
48#include <linux/compat.h>
49
50#include <asm/ipl.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 <asm/sysinfo.h>
66#include <asm/numa.h>
67#include "entry.h"
68
69/*
70 * Machine setup..
71 */
72unsigned int console_mode = 0;
73EXPORT_SYMBOL(console_mode);
74
75unsigned int console_devno = -1;
76EXPORT_SYMBOL(console_devno);
77
78unsigned int console_irq = -1;
79EXPORT_SYMBOL(console_irq);
80
81unsigned long elf_hwcap __read_mostly = 0;
82char elf_platform[ELF_PLATFORM_SIZE];
83
84unsigned long int_hwcap = 0;
85
86int __initdata memory_end_set;
87unsigned long __initdata memory_end;
88unsigned long __initdata max_physmem_end;
89
90unsigned long VMALLOC_START;
91EXPORT_SYMBOL(VMALLOC_START);
92
93unsigned long VMALLOC_END;
94EXPORT_SYMBOL(VMALLOC_END);
95
96struct page *vmemmap;
97EXPORT_SYMBOL(vmemmap);
98
99unsigned long MODULES_VADDR;
100unsigned long MODULES_END;
101
102/* An array with a pointer to the lowcore of every CPU. */
103struct lowcore *lowcore_ptr[NR_CPUS];
104EXPORT_SYMBOL(lowcore_ptr);
105
106/*
107 * This is set up by the setup-routine at boot-time
108 * for S390 need to find out, what we have to setup
109 * using address 0x10400 ...
110 */
111
112#include <asm/setup.h>
113
114/*
115 * condev= and conmode= setup parameter.
116 */
117
118static int __init condev_setup(char *str)
119{
120 int vdev;
121
122 vdev = simple_strtoul(str, &str, 0);
123 if (vdev >= 0 && vdev < 65536) {
124 console_devno = vdev;
125 console_irq = -1;
126 }
127 return 1;
128}
129
130__setup("condev=", condev_setup);
131
132static void __init set_preferred_console(void)
133{
134 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
135 add_preferred_console("ttyS", 0, NULL);
136 else if (CONSOLE_IS_3270)
137 add_preferred_console("tty3270", 0, NULL);
138 else if (CONSOLE_IS_VT220)
139 add_preferred_console("ttyS", 1, NULL);
140 else if (CONSOLE_IS_HVC)
141 add_preferred_console("hvc", 0, NULL);
142}
143
144static int __init conmode_setup(char *str)
145{
146#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
147 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
148 SET_CONSOLE_SCLP;
149#endif
150#if defined(CONFIG_TN3215_CONSOLE)
151 if (strncmp(str, "3215", 5) == 0)
152 SET_CONSOLE_3215;
153#endif
154#if defined(CONFIG_TN3270_CONSOLE)
155 if (strncmp(str, "3270", 5) == 0)
156 SET_CONSOLE_3270;
157#endif
158 set_preferred_console();
159 return 1;
160}
161
162__setup("conmode=", conmode_setup);
163
164static void __init conmode_default(void)
165{
166 char query_buffer[1024];
167 char *ptr;
168
169 if (MACHINE_IS_VM) {
170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172 ptr = strstr(query_buffer, "SUBCHANNEL =");
173 console_irq = simple_strtoul(ptr + 13, NULL, 16);
174 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175 ptr = strstr(query_buffer, "CONMODE");
176 /*
177 * Set the conmode to 3215 so that the device recognition
178 * will set the cu_type of the console to 3215. If the
179 * conmode is 3270 and we don't set it back then both
180 * 3215 and the 3270 driver will try to access the console
181 * device (3215 as console and 3270 as normal tty).
182 */
183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
184 if (ptr == NULL) {
185#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
186 SET_CONSOLE_SCLP;
187#endif
188 return;
189 }
190 if (strncmp(ptr + 8, "3270", 4) == 0) {
191#if defined(CONFIG_TN3270_CONSOLE)
192 SET_CONSOLE_3270;
193#elif defined(CONFIG_TN3215_CONSOLE)
194 SET_CONSOLE_3215;
195#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196 SET_CONSOLE_SCLP;
197#endif
198 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
199#if defined(CONFIG_TN3215_CONSOLE)
200 SET_CONSOLE_3215;
201#elif defined(CONFIG_TN3270_CONSOLE)
202 SET_CONSOLE_3270;
203#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204 SET_CONSOLE_SCLP;
205#endif
206 }
207 } else if (MACHINE_IS_KVM) {
208 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
209 SET_CONSOLE_VT220;
210 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
211 SET_CONSOLE_SCLP;
212 else
213 SET_CONSOLE_HVC;
214 } else {
215#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216 SET_CONSOLE_SCLP;
217#endif
218 }
219}
220
221#ifdef CONFIG_CRASH_DUMP
222static void __init setup_zfcpdump(void)
223{
224 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
225 return;
226 if (OLDMEM_BASE)
227 return;
228 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
229 console_loglevel = 2;
230}
231#else
232static inline void setup_zfcpdump(void) {}
233#endif /* CONFIG_CRASH_DUMP */
234
235 /*
236 * Reboot, halt and power_off stubs. They just call _machine_restart,
237 * _machine_halt or _machine_power_off.
238 */
239
240void machine_restart(char *command)
241{
242 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
243 /*
244 * Only unblank the console if we are called in enabled
245 * context or a bust_spinlocks cleared the way for us.
246 */
247 console_unblank();
248 _machine_restart(command);
249}
250
251void machine_halt(void)
252{
253 if (!in_interrupt() || oops_in_progress)
254 /*
255 * Only unblank the console if we are called in enabled
256 * context or a bust_spinlocks cleared the way for us.
257 */
258 console_unblank();
259 _machine_halt();
260}
261
262void machine_power_off(void)
263{
264 if (!in_interrupt() || oops_in_progress)
265 /*
266 * Only unblank the console if we are called in enabled
267 * context or a bust_spinlocks cleared the way for us.
268 */
269 console_unblank();
270 _machine_power_off();
271}
272
273/*
274 * Dummy power off function.
275 */
276void (*pm_power_off)(void) = machine_power_off;
277EXPORT_SYMBOL_GPL(pm_power_off);
278
279static int __init early_parse_mem(char *p)
280{
281 memory_end = memparse(p, &p);
282 memory_end &= PAGE_MASK;
283 memory_end_set = 1;
284 return 0;
285}
286early_param("mem", early_parse_mem);
287
288static int __init parse_vmalloc(char *arg)
289{
290 if (!arg)
291 return -EINVAL;
292 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
293 return 0;
294}
295early_param("vmalloc", parse_vmalloc);
296
297void *restart_stack __section(.data);
298
299static void __init setup_lowcore(void)
300{
301 struct lowcore *lc;
302
303 /*
304 * Setup lowcore for boot cpu
305 */
306 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
307 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
308 lc->restart_psw.mask = PSW_KERNEL_BITS;
309 lc->restart_psw.addr = (unsigned long) restart_int_handler;
310 lc->external_new_psw.mask = PSW_KERNEL_BITS |
311 PSW_MASK_DAT | PSW_MASK_MCHECK;
312 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
313 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
314 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
315 lc->svc_new_psw.addr = (unsigned long) system_call;
316 lc->program_new_psw.mask = PSW_KERNEL_BITS |
317 PSW_MASK_DAT | PSW_MASK_MCHECK;
318 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
319 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
320 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
321 lc->io_new_psw.mask = PSW_KERNEL_BITS |
322 PSW_MASK_DAT | PSW_MASK_MCHECK;
323 lc->io_new_psw.addr = (unsigned long) io_int_handler;
324 lc->clock_comparator = -1ULL;
325 lc->kernel_stack = ((unsigned long) &init_thread_union)
326 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327 lc->async_stack = (unsigned long)
328 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
329 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->panic_stack = (unsigned long)
331 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
332 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
333 lc->current_task = (unsigned long)&init_task;
334 lc->lpp = LPP_MAGIC;
335 lc->machine_flags = S390_lowcore.machine_flags;
336 lc->preempt_count = S390_lowcore.preempt_count;
337 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
338 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
339 MAX_FACILITY_BIT/8);
340 if (MACHINE_HAS_VX)
341 lc->vector_save_area_addr =
342 (unsigned long) &lc->vector_save_area;
343 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
344 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
345 lc->async_enter_timer = S390_lowcore.async_enter_timer;
346 lc->exit_timer = S390_lowcore.exit_timer;
347 lc->user_timer = S390_lowcore.user_timer;
348 lc->system_timer = S390_lowcore.system_timer;
349 lc->steal_timer = S390_lowcore.steal_timer;
350 lc->last_update_timer = S390_lowcore.last_update_timer;
351 lc->last_update_clock = S390_lowcore.last_update_clock;
352
353 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
354 restart_stack += ASYNC_SIZE;
355
356 /*
357 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
358 * restart data to the absolute zero lowcore. This is necessary if
359 * PSW restart is done on an offline CPU that has lowcore zero.
360 */
361 lc->restart_stack = (unsigned long) restart_stack;
362 lc->restart_fn = (unsigned long) do_restart;
363 lc->restart_data = 0;
364 lc->restart_source = -1UL;
365
366 /* Setup absolute zero lowcore */
367 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
368 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
369 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
370 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
371 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
372
373#ifdef CONFIG_SMP
374 lc->spinlock_lockval = arch_spin_lockval(0);
375#endif
376
377 set_prefix((u32)(unsigned long) lc);
378 lowcore_ptr[0] = lc;
379}
380
381static struct resource code_resource = {
382 .name = "Kernel code",
383 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
384};
385
386static struct resource data_resource = {
387 .name = "Kernel data",
388 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
389};
390
391static struct resource bss_resource = {
392 .name = "Kernel bss",
393 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
394};
395
396static struct resource __initdata *standard_resources[] = {
397 &code_resource,
398 &data_resource,
399 &bss_resource,
400};
401
402static void __init setup_resources(void)
403{
404 struct resource *res, *std_res, *sub_res;
405 struct memblock_region *reg;
406 int j;
407
408 code_resource.start = (unsigned long) &_text;
409 code_resource.end = (unsigned long) &_etext - 1;
410 data_resource.start = (unsigned long) &_etext;
411 data_resource.end = (unsigned long) &_edata - 1;
412 bss_resource.start = (unsigned long) &__bss_start;
413 bss_resource.end = (unsigned long) &__bss_stop - 1;
414
415 for_each_memblock(memory, reg) {
416 res = memblock_virt_alloc(sizeof(*res), 8);
417 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
418
419 res->name = "System RAM";
420 res->start = reg->base;
421 res->end = reg->base + reg->size - 1;
422 request_resource(&iomem_resource, res);
423
424 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
425 std_res = standard_resources[j];
426 if (std_res->start < res->start ||
427 std_res->start > res->end)
428 continue;
429 if (std_res->end > res->end) {
430 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8);
431 *sub_res = *std_res;
432 sub_res->end = res->end;
433 std_res->start = res->end + 1;
434 request_resource(res, sub_res);
435 } else {
436 request_resource(res, std_res);
437 }
438 }
439 }
440#ifdef CONFIG_CRASH_DUMP
441 /*
442 * Re-add removed crash kernel memory as reserved memory. This makes
443 * sure it will be mapped with the identity mapping and struct pages
444 * will be created, so it can be resized later on.
445 * However add it later since the crash kernel resource should not be
446 * part of the System RAM resource.
447 */
448 if (crashk_res.end) {
449 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
450 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
451 insert_resource(&iomem_resource, &crashk_res);
452 }
453#endif
454}
455
456static void __init setup_memory_end(void)
457{
458 unsigned long vmax, vmalloc_size, tmp;
459
460 /* Choose kernel address space layout: 2, 3, or 4 levels. */
461 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
462 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
463 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
464 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
465 vmax = 1UL << 42; /* 3-level kernel page table */
466 else
467 vmax = 1UL << 53; /* 4-level kernel page table */
468 /* module area is at the end of the kernel address space. */
469 MODULES_END = vmax;
470 MODULES_VADDR = MODULES_END - MODULES_LEN;
471 VMALLOC_END = MODULES_VADDR;
472 VMALLOC_START = vmax - vmalloc_size;
473
474 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
475 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
476 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
477 tmp = SECTION_ALIGN_UP(tmp);
478 tmp = VMALLOC_START - tmp * sizeof(struct page);
479 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
480 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
481 vmemmap = (struct page *) tmp;
482
483 /* Take care that memory_end is set and <= vmemmap */
484 memory_end = min(memory_end ?: max_physmem_end, tmp);
485 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
486 memblock_remove(memory_end, ULONG_MAX);
487
488 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
489}
490
491static void __init setup_vmcoreinfo(void)
492{
493 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
494}
495
496#ifdef CONFIG_CRASH_DUMP
497
498/*
499 * When kdump is enabled, we have to ensure that no memory from
500 * the area [0 - crashkernel memory size] and
501 * [crashk_res.start - crashk_res.end] is set offline.
502 */
503static int kdump_mem_notifier(struct notifier_block *nb,
504 unsigned long action, void *data)
505{
506 struct memory_notify *arg = data;
507
508 if (action != MEM_GOING_OFFLINE)
509 return NOTIFY_OK;
510 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
511 return NOTIFY_BAD;
512 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
513 return NOTIFY_OK;
514 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
515 return NOTIFY_OK;
516 return NOTIFY_BAD;
517}
518
519static struct notifier_block kdump_mem_nb = {
520 .notifier_call = kdump_mem_notifier,
521};
522
523#endif
524
525/*
526 * Make sure that the area behind memory_end is protected
527 */
528static void reserve_memory_end(void)
529{
530#ifdef CONFIG_CRASH_DUMP
531 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
532 !OLDMEM_BASE && sclp.hsa_size) {
533 memory_end = sclp.hsa_size;
534 memory_end &= PAGE_MASK;
535 memory_end_set = 1;
536 }
537#endif
538 if (!memory_end_set)
539 return;
540 memblock_reserve(memory_end, ULONG_MAX);
541}
542
543/*
544 * Make sure that oldmem, where the dump is stored, is protected
545 */
546static void reserve_oldmem(void)
547{
548#ifdef CONFIG_CRASH_DUMP
549 if (OLDMEM_BASE)
550 /* Forget all memory above the running kdump system */
551 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
552#endif
553}
554
555/*
556 * Make sure that oldmem, where the dump is stored, is protected
557 */
558static void remove_oldmem(void)
559{
560#ifdef CONFIG_CRASH_DUMP
561 if (OLDMEM_BASE)
562 /* Forget all memory above the running kdump system */
563 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
564#endif
565}
566
567/*
568 * Reserve memory for kdump kernel to be loaded with kexec
569 */
570static void __init reserve_crashkernel(void)
571{
572#ifdef CONFIG_CRASH_DUMP
573 unsigned long long crash_base, crash_size;
574 phys_addr_t low, high;
575 int rc;
576
577 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
578 &crash_base);
579
580 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
581 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
582 if (rc || crash_size == 0)
583 return;
584
585 if (memblock.memory.regions[0].size < crash_size) {
586 pr_info("crashkernel reservation failed: %s\n",
587 "first memory chunk must be at least crashkernel size");
588 return;
589 }
590
591 low = crash_base ?: OLDMEM_BASE;
592 high = low + crash_size;
593 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
594 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
595 crash_base = low;
596 } else {
597 /* Find suitable area in free memory */
598 low = max_t(unsigned long, crash_size, sclp.hsa_size);
599 high = crash_base ? crash_base + crash_size : ULONG_MAX;
600
601 if (crash_base && crash_base < low) {
602 pr_info("crashkernel reservation failed: %s\n",
603 "crash_base too low");
604 return;
605 }
606 low = crash_base ?: low;
607 crash_base = memblock_find_in_range(low, high, crash_size,
608 KEXEC_CRASH_MEM_ALIGN);
609 }
610
611 if (!crash_base) {
612 pr_info("crashkernel reservation failed: %s\n",
613 "no suitable area found");
614 return;
615 }
616
617 if (register_memory_notifier(&kdump_mem_nb))
618 return;
619
620 if (!OLDMEM_BASE && MACHINE_IS_VM)
621 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
622 crashk_res.start = crash_base;
623 crashk_res.end = crash_base + crash_size - 1;
624 memblock_remove(crash_base, crash_size);
625 pr_info("Reserving %lluMB of memory at %lluMB "
626 "for crashkernel (System RAM: %luMB)\n",
627 crash_size >> 20, crash_base >> 20,
628 (unsigned long)memblock.memory.total_size >> 20);
629 os_info_crashkernel_add(crash_base, crash_size);
630#endif
631}
632
633/*
634 * Reserve the initrd from being used by memblock
635 */
636static void __init reserve_initrd(void)
637{
638#ifdef CONFIG_BLK_DEV_INITRD
639 initrd_start = INITRD_START;
640 initrd_end = initrd_start + INITRD_SIZE;
641 memblock_reserve(INITRD_START, INITRD_SIZE);
642#endif
643}
644
645/*
646 * Check for initrd being in usable memory
647 */
648static void __init check_initrd(void)
649{
650#ifdef CONFIG_BLK_DEV_INITRD
651 if (INITRD_START && INITRD_SIZE &&
652 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
653 pr_err("The initial RAM disk does not fit into the memory\n");
654 memblock_free(INITRD_START, INITRD_SIZE);
655 initrd_start = initrd_end = 0;
656 }
657#endif
658}
659
660/*
661 * Reserve memory used for lowcore/command line/kernel image.
662 */
663static void __init reserve_kernel(void)
664{
665 unsigned long start_pfn = PFN_UP(__pa(&_end));
666
667#ifdef CONFIG_DMA_API_DEBUG
668 /*
669 * DMA_API_DEBUG code stumbles over addresses from the
670 * range [_ehead, _stext]. Mark the memory as reserved
671 * so it is not used for CONFIG_DMA_API_DEBUG=y.
672 */
673 memblock_reserve(0, PFN_PHYS(start_pfn));
674#else
675 memblock_reserve(0, (unsigned long)_ehead);
676 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
677 - (unsigned long)_stext);
678#endif
679}
680
681static void __init setup_memory(void)
682{
683 struct memblock_region *reg;
684
685 /*
686 * Init storage key for present memory
687 */
688 for_each_memblock(memory, reg) {
689 storage_key_init_range(reg->base, reg->base + reg->size);
690 }
691 psw_set_key(PAGE_DEFAULT_KEY);
692
693 /* Only cosmetics */
694 memblock_enforce_memory_limit(memblock_end_of_DRAM());
695}
696
697/*
698 * Setup hardware capabilities.
699 */
700static int __init setup_hwcaps(void)
701{
702 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
703 struct cpuid cpu_id;
704 int i;
705
706 /*
707 * The store facility list bits numbers as found in the principles
708 * of operation are numbered with bit 1UL<<31 as number 0 to
709 * bit 1UL<<0 as number 31.
710 * Bit 0: instructions named N3, "backported" to esa-mode
711 * Bit 2: z/Architecture mode is active
712 * Bit 7: the store-facility-list-extended facility is installed
713 * Bit 17: the message-security assist is installed
714 * Bit 19: the long-displacement facility is installed
715 * Bit 21: the extended-immediate facility is installed
716 * Bit 22: extended-translation facility 3 is installed
717 * Bit 30: extended-translation facility 3 enhancement facility
718 * These get translated to:
719 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
720 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
721 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
722 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
723 */
724 for (i = 0; i < 6; i++)
725 if (test_facility(stfl_bits[i]))
726 elf_hwcap |= 1UL << i;
727
728 if (test_facility(22) && test_facility(30))
729 elf_hwcap |= HWCAP_S390_ETF3EH;
730
731 /*
732 * Check for additional facilities with store-facility-list-extended.
733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735 * as stored by stfl, bits 32-xxx contain additional facilities.
736 * How many facility words are stored depends on the number of
737 * doublewords passed to the instruction. The additional facilities
738 * are:
739 * Bit 42: decimal floating point facility is installed
740 * Bit 44: perform floating point operation facility is installed
741 * translated to:
742 * HWCAP_S390_DFP bit 6 (42 && 44).
743 */
744 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
745 elf_hwcap |= HWCAP_S390_DFP;
746
747 /*
748 * Huge page support HWCAP_S390_HPAGE is bit 7.
749 */
750 if (MACHINE_HAS_HPAGE)
751 elf_hwcap |= HWCAP_S390_HPAGE;
752
753 /*
754 * 64-bit register support for 31-bit processes
755 * HWCAP_S390_HIGH_GPRS is bit 9.
756 */
757 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
758
759 /*
760 * Transactional execution support HWCAP_S390_TE is bit 10.
761 */
762 if (test_facility(50) && test_facility(73))
763 elf_hwcap |= HWCAP_S390_TE;
764
765 /*
766 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
767 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
768 * instead of facility bit 129.
769 */
770 if (MACHINE_HAS_VX)
771 elf_hwcap |= HWCAP_S390_VXRS;
772 get_cpu_id(&cpu_id);
773 add_device_randomness(&cpu_id, sizeof(cpu_id));
774 switch (cpu_id.machine) {
775 case 0x2064:
776 case 0x2066:
777 default: /* Use "z900" as default for 64 bit kernels. */
778 strcpy(elf_platform, "z900");
779 break;
780 case 0x2084:
781 case 0x2086:
782 strcpy(elf_platform, "z990");
783 break;
784 case 0x2094:
785 case 0x2096:
786 strcpy(elf_platform, "z9-109");
787 break;
788 case 0x2097:
789 case 0x2098:
790 strcpy(elf_platform, "z10");
791 break;
792 case 0x2817:
793 case 0x2818:
794 strcpy(elf_platform, "z196");
795 break;
796 case 0x2827:
797 case 0x2828:
798 strcpy(elf_platform, "zEC12");
799 break;
800 case 0x2964:
801 case 0x2965:
802 strcpy(elf_platform, "z13");
803 break;
804 }
805
806 /*
807 * Virtualization support HWCAP_INT_SIE is bit 0.
808 */
809 if (sclp.has_sief2)
810 int_hwcap |= HWCAP_INT_SIE;
811
812 return 0;
813}
814arch_initcall(setup_hwcaps);
815
816/*
817 * Add system information as device randomness
818 */
819static void __init setup_randomness(void)
820{
821 struct sysinfo_3_2_2 *vmms;
822
823 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
824 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
825 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
826 memblock_free((unsigned long) vmms, PAGE_SIZE);
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 */
834static 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 * Setup function called from init/main.c just after the banner
847 * was printed.
848 */
849
850void __init setup_arch(char **cmdline_p)
851{
852 /*
853 * print what head.S has found out about the machine
854 */
855 if (MACHINE_IS_VM)
856 pr_info("Linux is running as a z/VM "
857 "guest operating system in 64-bit mode\n");
858 else if (MACHINE_IS_KVM)
859 pr_info("Linux is running under KVM in 64-bit mode\n");
860 else if (MACHINE_IS_LPAR)
861 pr_info("Linux is running natively in 64-bit mode\n");
862
863 /* Have one command line that is parsed and saved in /proc/cmdline */
864 /* boot_command_line has been already set up in early.c */
865 *cmdline_p = boot_command_line;
866
867 ROOT_DEV = Root_RAM0;
868
869 /* Is init_mm really needed? */
870 init_mm.start_code = PAGE_OFFSET;
871 init_mm.end_code = (unsigned long) &_etext;
872 init_mm.end_data = (unsigned long) &_edata;
873 init_mm.brk = (unsigned long) &_end;
874
875 parse_early_param();
876#ifdef CONFIG_CRASH_DUMP
877 /* Deactivate elfcorehdr= kernel parameter */
878 elfcorehdr_addr = ELFCORE_ADDR_MAX;
879#endif
880
881 os_info_init();
882 setup_ipl();
883 setup_task_size();
884
885 /* Do some memory reservations *before* memory is added to memblock */
886 reserve_memory_end();
887 reserve_oldmem();
888 reserve_kernel();
889 reserve_initrd();
890 memblock_allow_resize();
891
892 /* Get information about *all* installed memory */
893 detect_memory_memblock();
894
895 remove_oldmem();
896
897 /*
898 * Make sure all chunks are MAX_ORDER aligned so we don't need the
899 * extra checks that HOLES_IN_ZONE would require.
900 *
901 * Is this still required?
902 */
903 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
904
905 setup_memory_end();
906 setup_memory();
907 dma_contiguous_reserve(memory_end);
908
909 check_initrd();
910 reserve_crashkernel();
911#ifdef CONFIG_CRASH_DUMP
912 /*
913 * Be aware that smp_save_dump_cpus() triggers a system reset.
914 * Therefore CPU and device initialization should be done afterwards.
915 */
916 smp_save_dump_cpus();
917#endif
918
919 setup_resources();
920 setup_vmcoreinfo();
921 setup_lowcore();
922 smp_fill_possible_mask();
923 cpu_detect_mhz_feature();
924 cpu_init();
925 numa_setup();
926 smp_detect_cpus();
927 topology_init_early();
928
929 /*
930 * Create kernel page tables and switch to virtual addressing.
931 */
932 paging_init();
933
934 /* Setup default console */
935 conmode_default();
936 set_preferred_console();
937
938 /* Setup zfcpdump support */
939 setup_zfcpdump();
940
941 /* Add system specific data to the random pool */
942 setup_randomness();
943}
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
9 */
10
11/*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
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/facility.h>
51#include <asm/smp.h>
52#include <asm/mmu_context.h>
53#include <asm/cpcmd.h>
54#include <asm/lowcore.h>
55#include <asm/irq.h>
56#include <asm/page.h>
57#include <asm/ptrace.h>
58#include <asm/sections.h>
59#include <asm/ebcdic.h>
60#include <asm/kvm_virtio.h>
61#include <asm/diag.h>
62#include <asm/os_info.h>
63#include <asm/sclp.h>
64#include "entry.h"
65
66/*
67 * Machine setup..
68 */
69unsigned int console_mode = 0;
70EXPORT_SYMBOL(console_mode);
71
72unsigned int console_devno = -1;
73EXPORT_SYMBOL(console_devno);
74
75unsigned int console_irq = -1;
76EXPORT_SYMBOL(console_irq);
77
78unsigned long elf_hwcap = 0;
79char elf_platform[ELF_PLATFORM_SIZE];
80
81struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
82
83int __initdata memory_end_set;
84unsigned long __initdata memory_end;
85
86unsigned long VMALLOC_START;
87EXPORT_SYMBOL(VMALLOC_START);
88
89unsigned long VMALLOC_END;
90EXPORT_SYMBOL(VMALLOC_END);
91
92struct page *vmemmap;
93EXPORT_SYMBOL(vmemmap);
94
95#ifdef CONFIG_64BIT
96unsigned long MODULES_VADDR;
97unsigned long MODULES_END;
98#endif
99
100/* An array with a pointer to the lowcore of every CPU. */
101struct _lowcore *lowcore_ptr[NR_CPUS];
102EXPORT_SYMBOL(lowcore_ptr);
103
104/*
105 * This is set up by the setup-routine at boot-time
106 * for S390 need to find out, what we have to setup
107 * using address 0x10400 ...
108 */
109
110#include <asm/setup.h>
111
112/*
113 * condev= and conmode= setup parameter.
114 */
115
116static int __init condev_setup(char *str)
117{
118 int vdev;
119
120 vdev = simple_strtoul(str, &str, 0);
121 if (vdev >= 0 && vdev < 65536) {
122 console_devno = vdev;
123 console_irq = -1;
124 }
125 return 1;
126}
127
128__setup("condev=", condev_setup);
129
130static void __init set_preferred_console(void)
131{
132 if (MACHINE_IS_KVM) {
133 if (sclp_has_vt220())
134 add_preferred_console("ttyS", 1, NULL);
135 else if (sclp_has_linemode())
136 add_preferred_console("ttyS", 0, NULL);
137 else
138 add_preferred_console("hvc", 0, NULL);
139 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
140 add_preferred_console("ttyS", 0, NULL);
141 else if (CONSOLE_IS_3270)
142 add_preferred_console("tty3270", 0, NULL);
143}
144
145static int __init conmode_setup(char *str)
146{
147#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
148 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
149 SET_CONSOLE_SCLP;
150#endif
151#if defined(CONFIG_TN3215_CONSOLE)
152 if (strncmp(str, "3215", 5) == 0)
153 SET_CONSOLE_3215;
154#endif
155#if defined(CONFIG_TN3270_CONSOLE)
156 if (strncmp(str, "3270", 5) == 0)
157 SET_CONSOLE_3270;
158#endif
159 set_preferred_console();
160 return 1;
161}
162
163__setup("conmode=", conmode_setup);
164
165static void __init conmode_default(void)
166{
167 char query_buffer[1024];
168 char *ptr;
169
170 if (MACHINE_IS_VM) {
171 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
172 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
173 ptr = strstr(query_buffer, "SUBCHANNEL =");
174 console_irq = simple_strtoul(ptr + 13, NULL, 16);
175 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
176 ptr = strstr(query_buffer, "CONMODE");
177 /*
178 * Set the conmode to 3215 so that the device recognition
179 * will set the cu_type of the console to 3215. If the
180 * conmode is 3270 and we don't set it back then both
181 * 3215 and the 3270 driver will try to access the console
182 * device (3215 as console and 3270 as normal tty).
183 */
184 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
185 if (ptr == NULL) {
186#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
187 SET_CONSOLE_SCLP;
188#endif
189 return;
190 }
191 if (strncmp(ptr + 8, "3270", 4) == 0) {
192#if defined(CONFIG_TN3270_CONSOLE)
193 SET_CONSOLE_3270;
194#elif defined(CONFIG_TN3215_CONSOLE)
195 SET_CONSOLE_3215;
196#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
197 SET_CONSOLE_SCLP;
198#endif
199 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
200#if defined(CONFIG_TN3215_CONSOLE)
201 SET_CONSOLE_3215;
202#elif defined(CONFIG_TN3270_CONSOLE)
203 SET_CONSOLE_3270;
204#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
205 SET_CONSOLE_SCLP;
206#endif
207 }
208 } else {
209#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 SET_CONSOLE_SCLP;
211#endif
212 }
213}
214
215#ifdef CONFIG_ZFCPDUMP
216static void __init setup_zfcpdump(void)
217{
218 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
219 return;
220 if (OLDMEM_BASE)
221 return;
222 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
223 console_loglevel = 2;
224}
225#else
226static inline void setup_zfcpdump(void) {}
227#endif /* CONFIG_ZFCPDUMP */
228
229 /*
230 * Reboot, halt and power_off stubs. They just call _machine_restart,
231 * _machine_halt or _machine_power_off.
232 */
233
234void machine_restart(char *command)
235{
236 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
237 /*
238 * Only unblank the console if we are called in enabled
239 * context or a bust_spinlocks cleared the way for us.
240 */
241 console_unblank();
242 _machine_restart(command);
243}
244
245void machine_halt(void)
246{
247 if (!in_interrupt() || oops_in_progress)
248 /*
249 * Only unblank the console if we are called in enabled
250 * context or a bust_spinlocks cleared the way for us.
251 */
252 console_unblank();
253 _machine_halt();
254}
255
256void machine_power_off(void)
257{
258 if (!in_interrupt() || oops_in_progress)
259 /*
260 * Only unblank the console if we are called in enabled
261 * context or a bust_spinlocks cleared the way for us.
262 */
263 console_unblank();
264 _machine_power_off();
265}
266
267/*
268 * Dummy power off function.
269 */
270void (*pm_power_off)(void) = machine_power_off;
271EXPORT_SYMBOL_GPL(pm_power_off);
272
273static int __init early_parse_mem(char *p)
274{
275 memory_end = memparse(p, &p);
276 memory_end_set = 1;
277 return 0;
278}
279early_param("mem", early_parse_mem);
280
281static int __init parse_vmalloc(char *arg)
282{
283 if (!arg)
284 return -EINVAL;
285 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
286 return 0;
287}
288early_param("vmalloc", parse_vmalloc);
289
290void *restart_stack __attribute__((__section__(".data")));
291
292static void __init setup_lowcore(void)
293{
294 struct _lowcore *lc;
295
296 /*
297 * Setup lowcore for boot cpu
298 */
299 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
300 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
301 lc->restart_psw.mask = PSW_KERNEL_BITS;
302 lc->restart_psw.addr =
303 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
304 lc->external_new_psw.mask = PSW_KERNEL_BITS |
305 PSW_MASK_DAT | PSW_MASK_MCHECK;
306 lc->external_new_psw.addr =
307 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
308 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
309 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
310 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
311 lc->program_new_psw.mask = PSW_KERNEL_BITS |
312 PSW_MASK_DAT | PSW_MASK_MCHECK;
313 lc->program_new_psw.addr =
314 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
315 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
316 lc->mcck_new_psw.addr =
317 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
318 lc->io_new_psw.mask = PSW_KERNEL_BITS |
319 PSW_MASK_DAT | PSW_MASK_MCHECK;
320 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
321 lc->clock_comparator = -1ULL;
322 lc->kernel_stack = ((unsigned long) &init_thread_union)
323 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
324 lc->async_stack = (unsigned long)
325 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
326 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327 lc->panic_stack = (unsigned long)
328 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
329 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
331 lc->thread_info = (unsigned long) &init_thread_union;
332 lc->machine_flags = S390_lowcore.machine_flags;
333 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
334 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
335 MAX_FACILITY_BIT/8);
336#ifndef CONFIG_64BIT
337 if (MACHINE_HAS_IEEE) {
338 lc->extended_save_area_addr = (__u32)
339 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
340 /* enable extended save area */
341 __ctl_set_bit(14, 29);
342 }
343#else
344 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
345#endif
346 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
347 lc->async_enter_timer = S390_lowcore.async_enter_timer;
348 lc->exit_timer = S390_lowcore.exit_timer;
349 lc->user_timer = S390_lowcore.user_timer;
350 lc->system_timer = S390_lowcore.system_timer;
351 lc->steal_timer = S390_lowcore.steal_timer;
352 lc->last_update_timer = S390_lowcore.last_update_timer;
353 lc->last_update_clock = S390_lowcore.last_update_clock;
354 lc->ftrace_func = S390_lowcore.ftrace_func;
355
356 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
357 restart_stack += ASYNC_SIZE;
358
359 /*
360 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
361 * restart data to the absolute zero lowcore. This is necessary if
362 * PSW restart is done on an offline CPU that has lowcore zero.
363 */
364 lc->restart_stack = (unsigned long) restart_stack;
365 lc->restart_fn = (unsigned long) do_restart;
366 lc->restart_data = 0;
367 lc->restart_source = -1UL;
368
369 /* Setup absolute zero lowcore */
370 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
371 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
372 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
373 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
374 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
375
376 set_prefix((u32)(unsigned long) lc);
377 lowcore_ptr[0] = lc;
378}
379
380static struct resource code_resource = {
381 .name = "Kernel code",
382 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
383};
384
385static struct resource data_resource = {
386 .name = "Kernel data",
387 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
388};
389
390static struct resource bss_resource = {
391 .name = "Kernel bss",
392 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
393};
394
395static struct resource __initdata *standard_resources[] = {
396 &code_resource,
397 &data_resource,
398 &bss_resource,
399};
400
401static void __init setup_resources(void)
402{
403 struct resource *res, *std_res, *sub_res;
404 int i, j;
405
406 code_resource.start = (unsigned long) &_text;
407 code_resource.end = (unsigned long) &_etext - 1;
408 data_resource.start = (unsigned long) &_etext;
409 data_resource.end = (unsigned long) &_edata - 1;
410 bss_resource.start = (unsigned long) &__bss_start;
411 bss_resource.end = (unsigned long) &__bss_stop - 1;
412
413 for (i = 0; i < MEMORY_CHUNKS; i++) {
414 if (!memory_chunk[i].size)
415 continue;
416 res = alloc_bootmem_low(sizeof(*res));
417 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
418 switch (memory_chunk[i].type) {
419 case CHUNK_READ_WRITE:
420 res->name = "System RAM";
421 break;
422 case CHUNK_READ_ONLY:
423 res->name = "System ROM";
424 res->flags |= IORESOURCE_READONLY;
425 break;
426 default:
427 res->name = "reserved";
428 }
429 res->start = memory_chunk[i].addr;
430 res->end = res->start + memory_chunk[i].size - 1;
431 request_resource(&iomem_resource, res);
432
433 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
434 std_res = standard_resources[j];
435 if (std_res->start < res->start ||
436 std_res->start > res->end)
437 continue;
438 if (std_res->end > res->end) {
439 sub_res = alloc_bootmem_low(sizeof(*sub_res));
440 *sub_res = *std_res;
441 sub_res->end = res->end;
442 std_res->start = res->end + 1;
443 request_resource(res, sub_res);
444 } else {
445 request_resource(res, std_res);
446 }
447 }
448 }
449}
450
451static void __init setup_memory_end(void)
452{
453 unsigned long vmax, vmalloc_size, tmp;
454 unsigned long real_memory_size = 0;
455 int i;
456
457
458#ifdef CONFIG_ZFCPDUMP
459 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
460 !OLDMEM_BASE && sclp_get_hsa_size()) {
461 memory_end = sclp_get_hsa_size();
462 memory_end_set = 1;
463 }
464#endif
465 memory_end &= PAGE_MASK;
466
467 /*
468 * Make sure all chunks are MAX_ORDER aligned so we don't need the
469 * extra checks that HOLES_IN_ZONE would require.
470 */
471 for (i = 0; i < MEMORY_CHUNKS; i++) {
472 unsigned long start, end;
473 struct mem_chunk *chunk;
474 unsigned long align;
475
476 chunk = &memory_chunk[i];
477 if (!chunk->size)
478 continue;
479 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
480 start = (chunk->addr + align - 1) & ~(align - 1);
481 end = (chunk->addr + chunk->size) & ~(align - 1);
482 if (start >= end)
483 memset(chunk, 0, sizeof(*chunk));
484 else {
485 chunk->addr = start;
486 chunk->size = end - start;
487 }
488 real_memory_size = max(real_memory_size,
489 chunk->addr + chunk->size);
490 }
491
492 /* Choose kernel address space layout: 2, 3, or 4 levels. */
493#ifdef CONFIG_64BIT
494 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
495 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
496 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
497 if (tmp <= (1UL << 42))
498 vmax = 1UL << 42; /* 3-level kernel page table */
499 else
500 vmax = 1UL << 53; /* 4-level kernel page table */
501 /* module area is at the end of the kernel address space. */
502 MODULES_END = vmax;
503 MODULES_VADDR = MODULES_END - MODULES_LEN;
504 VMALLOC_END = MODULES_VADDR;
505#else
506 vmalloc_size = VMALLOC_END ?: 96UL << 20;
507 vmax = 1UL << 31; /* 2-level kernel page table */
508 /* vmalloc area is at the end of the kernel address space. */
509 VMALLOC_END = vmax;
510#endif
511 VMALLOC_START = vmax - vmalloc_size;
512
513 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
514 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
515 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
516 tmp = SECTION_ALIGN_UP(tmp);
517 tmp = VMALLOC_START - tmp * sizeof(struct page);
518 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
519 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
520 vmemmap = (struct page *) tmp;
521
522 /* Take care that memory_end is set and <= vmemmap */
523 memory_end = min(memory_end ?: real_memory_size, tmp);
524
525 /* Fixup memory chunk array to fit into 0..memory_end */
526 for (i = 0; i < MEMORY_CHUNKS; i++) {
527 struct mem_chunk *chunk = &memory_chunk[i];
528
529 if (!chunk->size)
530 continue;
531 if (chunk->addr >= memory_end) {
532 memset(chunk, 0, sizeof(*chunk));
533 continue;
534 }
535 if (chunk->addr + chunk->size > memory_end)
536 chunk->size = memory_end - chunk->addr;
537 }
538}
539
540static void __init setup_vmcoreinfo(void)
541{
542 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
543}
544
545#ifdef CONFIG_CRASH_DUMP
546
547/*
548 * Find suitable location for crashkernel memory
549 */
550static unsigned long __init find_crash_base(unsigned long crash_size,
551 char **msg)
552{
553 unsigned long crash_base;
554 struct mem_chunk *chunk;
555 int i;
556
557 if (memory_chunk[0].size < crash_size) {
558 *msg = "first memory chunk must be at least crashkernel size";
559 return 0;
560 }
561 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
562 return OLDMEM_BASE;
563
564 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
565 chunk = &memory_chunk[i];
566 if (chunk->size == 0)
567 continue;
568 if (chunk->type != CHUNK_READ_WRITE)
569 continue;
570 if (chunk->size < crash_size)
571 continue;
572 crash_base = (chunk->addr + chunk->size) - crash_size;
573 if (crash_base < crash_size)
574 continue;
575 if (crash_base < sclp_get_hsa_size())
576 continue;
577 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
578 continue;
579 return crash_base;
580 }
581 *msg = "no suitable area found";
582 return 0;
583}
584
585/*
586 * Check if crash_base and crash_size is valid
587 */
588static int __init verify_crash_base(unsigned long crash_base,
589 unsigned long crash_size,
590 char **msg)
591{
592 struct mem_chunk *chunk;
593 int i;
594
595 /*
596 * Because we do the swap to zero, we must have at least 'crash_size'
597 * bytes free space before crash_base
598 */
599 if (crash_size > crash_base) {
600 *msg = "crashkernel offset must be greater than size";
601 return -EINVAL;
602 }
603
604 /* First memory chunk must be at least crash_size */
605 if (memory_chunk[0].size < crash_size) {
606 *msg = "first memory chunk must be at least crashkernel size";
607 return -EINVAL;
608 }
609 /* Check if we fit into the respective memory chunk */
610 for (i = 0; i < MEMORY_CHUNKS; i++) {
611 chunk = &memory_chunk[i];
612 if (chunk->size == 0)
613 continue;
614 if (crash_base < chunk->addr)
615 continue;
616 if (crash_base >= chunk->addr + chunk->size)
617 continue;
618 /* we have found the memory chunk */
619 if (crash_base + crash_size > chunk->addr + chunk->size) {
620 *msg = "selected memory chunk is too small for "
621 "crashkernel memory";
622 return -EINVAL;
623 }
624 return 0;
625 }
626 *msg = "invalid memory range specified";
627 return -EINVAL;
628}
629
630/*
631 * When kdump is enabled, we have to ensure that no memory from
632 * the area [0 - crashkernel memory size] and
633 * [crashk_res.start - crashk_res.end] is set offline.
634 */
635static int kdump_mem_notifier(struct notifier_block *nb,
636 unsigned long action, void *data)
637{
638 struct memory_notify *arg = data;
639
640 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
641 return NOTIFY_BAD;
642 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
643 return NOTIFY_OK;
644 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
645 return NOTIFY_OK;
646 return NOTIFY_BAD;
647}
648
649static struct notifier_block kdump_mem_nb = {
650 .notifier_call = kdump_mem_notifier,
651};
652
653#endif
654
655/*
656 * Make sure that oldmem, where the dump is stored, is protected
657 */
658static void reserve_oldmem(void)
659{
660#ifdef CONFIG_CRASH_DUMP
661 unsigned long real_size = 0;
662 int i;
663
664 if (!OLDMEM_BASE)
665 return;
666 for (i = 0; i < MEMORY_CHUNKS; i++) {
667 struct mem_chunk *chunk = &memory_chunk[i];
668
669 real_size = max(real_size, chunk->addr + chunk->size);
670 }
671 create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE);
672 create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE);
673#endif
674}
675
676/*
677 * Reserve memory for kdump kernel to be loaded with kexec
678 */
679static void __init reserve_crashkernel(void)
680{
681#ifdef CONFIG_CRASH_DUMP
682 unsigned long long crash_base, crash_size;
683 char *msg = NULL;
684 int rc;
685
686 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
687 &crash_base);
688 if (rc || crash_size == 0)
689 return;
690 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
691 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
692 if (register_memory_notifier(&kdump_mem_nb))
693 return;
694 if (!crash_base)
695 crash_base = find_crash_base(crash_size, &msg);
696 if (!crash_base) {
697 pr_info("crashkernel reservation failed: %s\n", msg);
698 unregister_memory_notifier(&kdump_mem_nb);
699 return;
700 }
701 if (verify_crash_base(crash_base, crash_size, &msg)) {
702 pr_info("crashkernel reservation failed: %s\n", msg);
703 unregister_memory_notifier(&kdump_mem_nb);
704 return;
705 }
706 if (!OLDMEM_BASE && MACHINE_IS_VM)
707 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
708 crashk_res.start = crash_base;
709 crashk_res.end = crash_base + crash_size - 1;
710 insert_resource(&iomem_resource, &crashk_res);
711 create_mem_hole(memory_chunk, crash_base, crash_size);
712 pr_info("Reserving %lluMB of memory at %lluMB "
713 "for crashkernel (System RAM: %luMB)\n",
714 crash_size >> 20, crash_base >> 20, memory_end >> 20);
715 os_info_crashkernel_add(crash_base, crash_size);
716#endif
717}
718
719static void __init setup_memory(void)
720{
721 unsigned long bootmap_size;
722 unsigned long start_pfn, end_pfn;
723 int i;
724
725 /*
726 * partially used pages are not usable - thus
727 * we are rounding upwards:
728 */
729 start_pfn = PFN_UP(__pa(&_end));
730 end_pfn = max_pfn = PFN_DOWN(memory_end);
731
732#ifdef CONFIG_BLK_DEV_INITRD
733 /*
734 * Move the initrd in case the bitmap of the bootmem allocater
735 * would overwrite it.
736 */
737
738 if (INITRD_START && INITRD_SIZE) {
739 unsigned long bmap_size;
740 unsigned long start;
741
742 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
743 bmap_size = PFN_PHYS(bmap_size);
744
745 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
746 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
747
748#ifdef CONFIG_CRASH_DUMP
749 if (OLDMEM_BASE) {
750 /* Move initrd behind kdump oldmem */
751 if (start + INITRD_SIZE > OLDMEM_BASE &&
752 start < OLDMEM_BASE + OLDMEM_SIZE)
753 start = OLDMEM_BASE + OLDMEM_SIZE;
754 }
755#endif
756 if (start + INITRD_SIZE > memory_end) {
757 pr_err("initrd extends beyond end of "
758 "memory (0x%08lx > 0x%08lx) "
759 "disabling initrd\n",
760 start + INITRD_SIZE, memory_end);
761 INITRD_START = INITRD_SIZE = 0;
762 } else {
763 pr_info("Moving initrd (0x%08lx -> "
764 "0x%08lx, size: %ld)\n",
765 INITRD_START, start, INITRD_SIZE);
766 memmove((void *) start, (void *) INITRD_START,
767 INITRD_SIZE);
768 INITRD_START = start;
769 }
770 }
771 }
772#endif
773
774 /*
775 * Initialize the boot-time allocator
776 */
777 bootmap_size = init_bootmem(start_pfn, end_pfn);
778
779 /*
780 * Register RAM areas with the bootmem allocator.
781 */
782
783 for (i = 0; i < MEMORY_CHUNKS; i++) {
784 unsigned long start_chunk, end_chunk, pfn;
785
786 if (!memory_chunk[i].size)
787 continue;
788 start_chunk = PFN_DOWN(memory_chunk[i].addr);
789 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
790 end_chunk = min(end_chunk, end_pfn);
791 if (start_chunk >= end_chunk)
792 continue;
793 memblock_add_node(PFN_PHYS(start_chunk),
794 PFN_PHYS(end_chunk - start_chunk), 0);
795 pfn = max(start_chunk, start_pfn);
796 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
797 }
798
799 psw_set_key(PAGE_DEFAULT_KEY);
800
801 free_bootmem_with_active_regions(0, max_pfn);
802
803 /*
804 * Reserve memory used for lowcore/command line/kernel image.
805 */
806 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
807 reserve_bootmem((unsigned long)_stext,
808 PFN_PHYS(start_pfn) - (unsigned long)_stext,
809 BOOTMEM_DEFAULT);
810 /*
811 * Reserve the bootmem bitmap itself as well. We do this in two
812 * steps (first step was init_bootmem()) because this catches
813 * the (very unlikely) case of us accidentally initializing the
814 * bootmem allocator with an invalid RAM area.
815 */
816 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
817 BOOTMEM_DEFAULT);
818
819#ifdef CONFIG_CRASH_DUMP
820 if (crashk_res.start)
821 reserve_bootmem(crashk_res.start,
822 crashk_res.end - crashk_res.start + 1,
823 BOOTMEM_DEFAULT);
824 if (is_kdump_kernel())
825 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
826 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
827#endif
828#ifdef CONFIG_BLK_DEV_INITRD
829 if (INITRD_START && INITRD_SIZE) {
830 if (INITRD_START + INITRD_SIZE <= memory_end) {
831 reserve_bootmem(INITRD_START, INITRD_SIZE,
832 BOOTMEM_DEFAULT);
833 initrd_start = INITRD_START;
834 initrd_end = initrd_start + INITRD_SIZE;
835 } else {
836 pr_err("initrd extends beyond end of "
837 "memory (0x%08lx > 0x%08lx) "
838 "disabling initrd\n",
839 initrd_start + INITRD_SIZE, memory_end);
840 initrd_start = initrd_end = 0;
841 }
842 }
843#endif
844}
845
846/*
847 * Setup hardware capabilities.
848 */
849static void __init setup_hwcaps(void)
850{
851 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
852 struct cpuid cpu_id;
853 int i;
854
855 /*
856 * The store facility list bits numbers as found in the principles
857 * of operation are numbered with bit 1UL<<31 as number 0 to
858 * bit 1UL<<0 as number 31.
859 * Bit 0: instructions named N3, "backported" to esa-mode
860 * Bit 2: z/Architecture mode is active
861 * Bit 7: the store-facility-list-extended facility is installed
862 * Bit 17: the message-security assist is installed
863 * Bit 19: the long-displacement facility is installed
864 * Bit 21: the extended-immediate facility is installed
865 * Bit 22: extended-translation facility 3 is installed
866 * Bit 30: extended-translation facility 3 enhancement facility
867 * These get translated to:
868 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
869 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
870 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
871 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
872 */
873 for (i = 0; i < 6; i++)
874 if (test_facility(stfl_bits[i]))
875 elf_hwcap |= 1UL << i;
876
877 if (test_facility(22) && test_facility(30))
878 elf_hwcap |= HWCAP_S390_ETF3EH;
879
880 /*
881 * Check for additional facilities with store-facility-list-extended.
882 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
883 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
884 * as stored by stfl, bits 32-xxx contain additional facilities.
885 * How many facility words are stored depends on the number of
886 * doublewords passed to the instruction. The additional facilities
887 * are:
888 * Bit 42: decimal floating point facility is installed
889 * Bit 44: perform floating point operation facility is installed
890 * translated to:
891 * HWCAP_S390_DFP bit 6 (42 && 44).
892 */
893 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
894 elf_hwcap |= HWCAP_S390_DFP;
895
896 /*
897 * Huge page support HWCAP_S390_HPAGE is bit 7.
898 */
899 if (MACHINE_HAS_HPAGE)
900 elf_hwcap |= HWCAP_S390_HPAGE;
901
902#if defined(CONFIG_64BIT)
903 /*
904 * 64-bit register support for 31-bit processes
905 * HWCAP_S390_HIGH_GPRS is bit 9.
906 */
907 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
908
909 /*
910 * Transactional execution support HWCAP_S390_TE is bit 10.
911 */
912 if (test_facility(50) && test_facility(73))
913 elf_hwcap |= HWCAP_S390_TE;
914#endif
915
916 get_cpu_id(&cpu_id);
917 switch (cpu_id.machine) {
918 case 0x9672:
919#if !defined(CONFIG_64BIT)
920 default: /* Use "g5" as default for 31 bit kernels. */
921#endif
922 strcpy(elf_platform, "g5");
923 break;
924 case 0x2064:
925 case 0x2066:
926#if defined(CONFIG_64BIT)
927 default: /* Use "z900" as default for 64 bit kernels. */
928#endif
929 strcpy(elf_platform, "z900");
930 break;
931 case 0x2084:
932 case 0x2086:
933 strcpy(elf_platform, "z990");
934 break;
935 case 0x2094:
936 case 0x2096:
937 strcpy(elf_platform, "z9-109");
938 break;
939 case 0x2097:
940 case 0x2098:
941 strcpy(elf_platform, "z10");
942 break;
943 case 0x2817:
944 case 0x2818:
945 strcpy(elf_platform, "z196");
946 break;
947 case 0x2827:
948 case 0x2828:
949 strcpy(elf_platform, "zEC12");
950 break;
951 }
952}
953
954/*
955 * Setup function called from init/main.c just after the banner
956 * was printed.
957 */
958
959void __init setup_arch(char **cmdline_p)
960{
961 /*
962 * print what head.S has found out about the machine
963 */
964#ifndef CONFIG_64BIT
965 if (MACHINE_IS_VM)
966 pr_info("Linux is running as a z/VM "
967 "guest operating system in 31-bit mode\n");
968 else if (MACHINE_IS_LPAR)
969 pr_info("Linux is running natively in 31-bit mode\n");
970 if (MACHINE_HAS_IEEE)
971 pr_info("The hardware system has IEEE compatible "
972 "floating point units\n");
973 else
974 pr_info("The hardware system has no IEEE compatible "
975 "floating point units\n");
976#else /* CONFIG_64BIT */
977 if (MACHINE_IS_VM)
978 pr_info("Linux is running as a z/VM "
979 "guest operating system in 64-bit mode\n");
980 else if (MACHINE_IS_KVM)
981 pr_info("Linux is running under KVM in 64-bit mode\n");
982 else if (MACHINE_IS_LPAR)
983 pr_info("Linux is running natively in 64-bit mode\n");
984#endif /* CONFIG_64BIT */
985
986 /* Have one command line that is parsed and saved in /proc/cmdline */
987 /* boot_command_line has been already set up in early.c */
988 *cmdline_p = boot_command_line;
989
990 ROOT_DEV = Root_RAM0;
991
992 init_mm.start_code = PAGE_OFFSET;
993 init_mm.end_code = (unsigned long) &_etext;
994 init_mm.end_data = (unsigned long) &_edata;
995 init_mm.brk = (unsigned long) &_end;
996
997 parse_early_param();
998 detect_memory_layout(memory_chunk, memory_end);
999 os_info_init();
1000 setup_ipl();
1001 reserve_oldmem();
1002 setup_memory_end();
1003 reserve_crashkernel();
1004 setup_memory();
1005 setup_resources();
1006 setup_vmcoreinfo();
1007 setup_lowcore();
1008
1009 smp_fill_possible_mask();
1010 cpu_init();
1011 s390_init_cpu_topology();
1012
1013 /*
1014 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1015 */
1016 setup_hwcaps();
1017
1018 /*
1019 * Create kernel page tables and switch to virtual addressing.
1020 */
1021 paging_init();
1022
1023 /* Setup default console */
1024 conmode_default();
1025 set_preferred_console();
1026
1027 /* Setup zfcpdump support */
1028 setup_zfcpdump();
1029}
1030
1031#ifdef CONFIG_32BIT
1032static int no_removal_warning __initdata;
1033
1034static int __init parse_no_removal_warning(char *str)
1035{
1036 no_removal_warning = 1;
1037 return 0;
1038}
1039__setup("no_removal_warning", parse_no_removal_warning);
1040
1041static int __init removal_warning(void)
1042{
1043 if (no_removal_warning)
1044 return 0;
1045 printk(KERN_ALERT "\n\n");
1046 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
1047 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
1048 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
1049 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
1050 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
1051 printk(KERN_CONT "please let us know. Please write to:\n");
1052 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
1053 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
1054 printk(KERN_CONT "Thank you!\n\n");
1055 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
1056 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
1057 schedule_timeout_uninterruptible(300 * HZ);
1058 return 0;
1059}
1060early_initcall(removal_warning);
1061#endif