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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-map-ops.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52#include <linux/hugetlb.h>
53#include <linux/kmemleak.h>
54
55#include <asm/archrandom.h>
56#include <asm/boot_data.h>
57#include <asm/ipl.h>
58#include <asm/facility.h>
59#include <asm/smp.h>
60#include <asm/mmu_context.h>
61#include <asm/cpcmd.h>
62#include <asm/abs_lowcore.h>
63#include <asm/nmi.h>
64#include <asm/irq.h>
65#include <asm/page.h>
66#include <asm/ptrace.h>
67#include <asm/sections.h>
68#include <asm/ebcdic.h>
69#include <asm/diag.h>
70#include <asm/os_info.h>
71#include <asm/sclp.h>
72#include <asm/stacktrace.h>
73#include <asm/sysinfo.h>
74#include <asm/numa.h>
75#include <asm/alternative.h>
76#include <asm/nospec-branch.h>
77#include <asm/physmem_info.h>
78#include <asm/maccess.h>
79#include <asm/uv.h>
80#include <asm/asm-offsets.h>
81#include "entry.h"
82
83/*
84 * Machine setup..
85 */
86unsigned int console_mode = 0;
87EXPORT_SYMBOL(console_mode);
88
89unsigned int console_devno = -1;
90EXPORT_SYMBOL(console_devno);
91
92unsigned int console_irq = -1;
93EXPORT_SYMBOL(console_irq);
94
95/*
96 * Some code and data needs to stay below 2 GB, even when the kernel would be
97 * relocated above 2 GB, because it has to use 31 bit addresses.
98 * Such code and data is part of the .amode31 section.
99 */
100char __amode31_ref *__samode31 = _samode31;
101char __amode31_ref *__eamode31 = _eamode31;
102char __amode31_ref *__stext_amode31 = _stext_amode31;
103char __amode31_ref *__etext_amode31 = _etext_amode31;
104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
106
107/*
108 * Control registers CR2, CR5 and CR15 are initialized with addresses
109 * of tables that must be placed below 2G which is handled by the AMODE31
110 * sections.
111 * Because the AMODE31 sections are relocated below 2G at startup,
112 * the content of control registers CR2, CR5 and CR15 must be updated
113 * with new addresses after the relocation. The initial initialization of
114 * control registers occurs in head64.S and then gets updated again after AMODE31
115 * relocation. We must access the relevant AMODE31 tables indirectly via
116 * pointers placed in the .amode31.refs linker section. Those pointers get
117 * updated automatically during AMODE31 relocation and always contain a valid
118 * address within AMODE31 sections.
119 */
120
121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125};
126
127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
128 0x80000000, 0, 0, 0,
129 0x80000000, 0, 0, 0,
130 0x80000000, 0, 0, 0,
131 0x80000000, 0, 0, 0,
132 0x80000000, 0, 0, 0,
133 0x80000000, 0, 0, 0,
134 0x80000000, 0, 0, 0,
135 0x80000000, 0, 0, 0
136};
137
138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141};
142
143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148unsigned long __bootdata_preserved(max_mappable);
149unsigned long __bootdata(ident_map_size);
150struct physmem_info __bootdata(physmem_info);
151
152unsigned long __bootdata_preserved(__kaslr_offset);
153int __bootdata_preserved(__kaslr_enabled);
154unsigned int __bootdata_preserved(zlib_dfltcc_support);
155EXPORT_SYMBOL(zlib_dfltcc_support);
156u64 __bootdata_preserved(stfle_fac_list[16]);
157EXPORT_SYMBOL(stfle_fac_list);
158u64 __bootdata_preserved(alt_stfle_fac_list[16]);
159struct oldmem_data __bootdata_preserved(oldmem_data);
160
161unsigned long VMALLOC_START;
162EXPORT_SYMBOL(VMALLOC_START);
163
164unsigned long VMALLOC_END;
165EXPORT_SYMBOL(VMALLOC_END);
166
167struct page *vmemmap;
168EXPORT_SYMBOL(vmemmap);
169unsigned long vmemmap_size;
170
171unsigned long MODULES_VADDR;
172unsigned long MODULES_END;
173
174/* An array with a pointer to the lowcore of every CPU. */
175struct lowcore *lowcore_ptr[NR_CPUS];
176EXPORT_SYMBOL(lowcore_ptr);
177
178DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
179
180/*
181 * The Write Back bit position in the physaddr is given by the SLPC PCI.
182 * Leaving the mask zero always uses write through which is safe
183 */
184unsigned long mio_wb_bit_mask __ro_after_init;
185
186/*
187 * This is set up by the setup-routine at boot-time
188 * for S390 need to find out, what we have to setup
189 * using address 0x10400 ...
190 */
191
192#include <asm/setup.h>
193
194/*
195 * condev= and conmode= setup parameter.
196 */
197
198static int __init condev_setup(char *str)
199{
200 int vdev;
201
202 vdev = simple_strtoul(str, &str, 0);
203 if (vdev >= 0 && vdev < 65536) {
204 console_devno = vdev;
205 console_irq = -1;
206 }
207 return 1;
208}
209
210__setup("condev=", condev_setup);
211
212static void __init set_preferred_console(void)
213{
214 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
215 add_preferred_console("ttyS", 0, NULL);
216 else if (CONSOLE_IS_3270)
217 add_preferred_console("tty3270", 0, NULL);
218 else if (CONSOLE_IS_VT220)
219 add_preferred_console("ttysclp", 0, NULL);
220 else if (CONSOLE_IS_HVC)
221 add_preferred_console("hvc", 0, NULL);
222}
223
224static int __init conmode_setup(char *str)
225{
226#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
227 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
228 SET_CONSOLE_SCLP;
229#endif
230#if defined(CONFIG_TN3215_CONSOLE)
231 if (!strcmp(str, "3215"))
232 SET_CONSOLE_3215;
233#endif
234#if defined(CONFIG_TN3270_CONSOLE)
235 if (!strcmp(str, "3270"))
236 SET_CONSOLE_3270;
237#endif
238 set_preferred_console();
239 return 1;
240}
241
242__setup("conmode=", conmode_setup);
243
244static void __init conmode_default(void)
245{
246 char query_buffer[1024];
247 char *ptr;
248
249 if (MACHINE_IS_VM) {
250 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
251 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
252 ptr = strstr(query_buffer, "SUBCHANNEL =");
253 console_irq = simple_strtoul(ptr + 13, NULL, 16);
254 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
255 ptr = strstr(query_buffer, "CONMODE");
256 /*
257 * Set the conmode to 3215 so that the device recognition
258 * will set the cu_type of the console to 3215. If the
259 * conmode is 3270 and we don't set it back then both
260 * 3215 and the 3270 driver will try to access the console
261 * device (3215 as console and 3270 as normal tty).
262 */
263 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
264 if (ptr == NULL) {
265#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
266 SET_CONSOLE_SCLP;
267#endif
268 return;
269 }
270 if (str_has_prefix(ptr + 8, "3270")) {
271#if defined(CONFIG_TN3270_CONSOLE)
272 SET_CONSOLE_3270;
273#elif defined(CONFIG_TN3215_CONSOLE)
274 SET_CONSOLE_3215;
275#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
276 SET_CONSOLE_SCLP;
277#endif
278 } else if (str_has_prefix(ptr + 8, "3215")) {
279#if defined(CONFIG_TN3215_CONSOLE)
280 SET_CONSOLE_3215;
281#elif defined(CONFIG_TN3270_CONSOLE)
282 SET_CONSOLE_3270;
283#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
284 SET_CONSOLE_SCLP;
285#endif
286 }
287 } else if (MACHINE_IS_KVM) {
288 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
289 SET_CONSOLE_VT220;
290 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
291 SET_CONSOLE_SCLP;
292 else
293 SET_CONSOLE_HVC;
294 } else {
295#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
296 SET_CONSOLE_SCLP;
297#endif
298 }
299}
300
301#ifdef CONFIG_CRASH_DUMP
302static void __init setup_zfcpdump(void)
303{
304 if (!is_ipl_type_dump())
305 return;
306 if (oldmem_data.start)
307 return;
308 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
309 console_loglevel = 2;
310}
311#else
312static inline void setup_zfcpdump(void) {}
313#endif /* CONFIG_CRASH_DUMP */
314
315 /*
316 * Reboot, halt and power_off stubs. They just call _machine_restart,
317 * _machine_halt or _machine_power_off.
318 */
319
320void machine_restart(char *command)
321{
322 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
323 /*
324 * Only unblank the console if we are called in enabled
325 * context or a bust_spinlocks cleared the way for us.
326 */
327 console_unblank();
328 _machine_restart(command);
329}
330
331void machine_halt(void)
332{
333 if (!in_interrupt() || oops_in_progress)
334 /*
335 * Only unblank the console if we are called in enabled
336 * context or a bust_spinlocks cleared the way for us.
337 */
338 console_unblank();
339 _machine_halt();
340}
341
342void machine_power_off(void)
343{
344 if (!in_interrupt() || oops_in_progress)
345 /*
346 * Only unblank the console if we are called in enabled
347 * context or a bust_spinlocks cleared the way for us.
348 */
349 console_unblank();
350 _machine_power_off();
351}
352
353/*
354 * Dummy power off function.
355 */
356void (*pm_power_off)(void) = machine_power_off;
357EXPORT_SYMBOL_GPL(pm_power_off);
358
359void *restart_stack;
360
361unsigned long stack_alloc(void)
362{
363#ifdef CONFIG_VMAP_STACK
364 void *ret;
365
366 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
367 NUMA_NO_NODE, __builtin_return_address(0));
368 kmemleak_not_leak(ret);
369 return (unsigned long)ret;
370#else
371 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
372#endif
373}
374
375void stack_free(unsigned long stack)
376{
377#ifdef CONFIG_VMAP_STACK
378 vfree((void *) stack);
379#else
380 free_pages(stack, THREAD_SIZE_ORDER);
381#endif
382}
383
384static unsigned long __init stack_alloc_early(void)
385{
386 unsigned long stack;
387
388 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
389 if (!stack) {
390 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
391 __func__, THREAD_SIZE, THREAD_SIZE);
392 }
393 return stack;
394}
395
396static void __init setup_lowcore(void)
397{
398 struct lowcore *lc, *abs_lc;
399
400 /*
401 * Setup lowcore for boot cpu
402 */
403 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
404 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
405 if (!lc)
406 panic("%s: Failed to allocate %zu bytes align=%zx\n",
407 __func__, sizeof(*lc), sizeof(*lc));
408
409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
410 lc->restart_psw.addr = __pa(restart_int_handler);
411 lc->external_new_psw.mask = PSW_KERNEL_BITS;
412 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
413 lc->svc_new_psw.mask = PSW_KERNEL_BITS;
414 lc->svc_new_psw.addr = (unsigned long) system_call;
415 lc->program_new_psw.mask = PSW_KERNEL_BITS;
416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
419 lc->io_new_psw.mask = PSW_KERNEL_BITS;
420 lc->io_new_psw.addr = (unsigned long) io_int_handler;
421 lc->clock_comparator = clock_comparator_max;
422 lc->current_task = (unsigned long)&init_task;
423 lc->lpp = LPP_MAGIC;
424 lc->machine_flags = S390_lowcore.machine_flags;
425 lc->preempt_count = S390_lowcore.preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
428 lc->exit_timer = S390_lowcore.exit_timer;
429 lc->user_timer = S390_lowcore.user_timer;
430 lc->system_timer = S390_lowcore.system_timer;
431 lc->steal_timer = S390_lowcore.steal_timer;
432 lc->last_update_timer = S390_lowcore.last_update_timer;
433 lc->last_update_clock = S390_lowcore.last_update_clock;
434 /*
435 * Allocate the global restart stack which is the same for
436 * all CPUs in case *one* of them does a PSW restart.
437 */
438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
442 lc->kernel_stack = S390_lowcore.kernel_stack;
443 /*
444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
445 * restart data to the absolute zero lowcore. This is necessary if
446 * PSW restart is done on an offline CPU that has lowcore zero.
447 */
448 lc->restart_stack = (unsigned long) restart_stack;
449 lc->restart_fn = (unsigned long) do_restart;
450 lc->restart_data = 0;
451 lc->restart_source = -1U;
452 lc->spinlock_lockval = arch_spin_lockval(0);
453 lc->spinlock_index = 0;
454 arch_spin_lock_setup(0);
455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
457 lc->preempt_count = PREEMPT_DISABLED;
458 lc->kernel_asce = S390_lowcore.kernel_asce;
459 lc->user_asce = S390_lowcore.user_asce;
460
461 system_ctlreg_init_save_area(lc);
462 abs_lc = get_abs_lowcore();
463 abs_lc->restart_stack = lc->restart_stack;
464 abs_lc->restart_fn = lc->restart_fn;
465 abs_lc->restart_data = lc->restart_data;
466 abs_lc->restart_source = lc->restart_source;
467 abs_lc->restart_psw = lc->restart_psw;
468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
469 abs_lc->program_new_psw = lc->program_new_psw;
470 abs_lc->mcesad = lc->mcesad;
471 put_abs_lowcore(abs_lc);
472
473 set_prefix(__pa(lc));
474 lowcore_ptr[0] = lc;
475 if (abs_lowcore_map(0, lowcore_ptr[0], false))
476 panic("Couldn't setup absolute lowcore");
477}
478
479static struct resource code_resource = {
480 .name = "Kernel code",
481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
482};
483
484static struct resource data_resource = {
485 .name = "Kernel data",
486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
487};
488
489static struct resource bss_resource = {
490 .name = "Kernel bss",
491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
492};
493
494static struct resource __initdata *standard_resources[] = {
495 &code_resource,
496 &data_resource,
497 &bss_resource,
498};
499
500static void __init setup_resources(void)
501{
502 struct resource *res, *std_res, *sub_res;
503 phys_addr_t start, end;
504 int j;
505 u64 i;
506
507 code_resource.start = (unsigned long) _text;
508 code_resource.end = (unsigned long) _etext - 1;
509 data_resource.start = (unsigned long) _etext;
510 data_resource.end = (unsigned long) _edata - 1;
511 bss_resource.start = (unsigned long) __bss_start;
512 bss_resource.end = (unsigned long) __bss_stop - 1;
513
514 for_each_mem_range(i, &start, &end) {
515 res = memblock_alloc(sizeof(*res), 8);
516 if (!res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*res), 8);
519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
520
521 res->name = "System RAM";
522 res->start = start;
523 /*
524 * In memblock, end points to the first byte after the
525 * range while in resources, end points to the last byte in
526 * the range.
527 */
528 res->end = end - 1;
529 request_resource(&iomem_resource, res);
530
531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
532 std_res = standard_resources[j];
533 if (std_res->start < res->start ||
534 std_res->start > res->end)
535 continue;
536 if (std_res->end > res->end) {
537 sub_res = memblock_alloc(sizeof(*sub_res), 8);
538 if (!sub_res)
539 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
540 __func__, sizeof(*sub_res), 8);
541 *sub_res = *std_res;
542 sub_res->end = res->end;
543 std_res->start = res->end + 1;
544 request_resource(res, sub_res);
545 } else {
546 request_resource(res, std_res);
547 }
548 }
549 }
550#ifdef CONFIG_CRASH_DUMP
551 /*
552 * Re-add removed crash kernel memory as reserved memory. This makes
553 * sure it will be mapped with the identity mapping and struct pages
554 * will be created, so it can be resized later on.
555 * However add it later since the crash kernel resource should not be
556 * part of the System RAM resource.
557 */
558 if (crashk_res.end) {
559 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
560 0, MEMBLOCK_NONE);
561 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
562 insert_resource(&iomem_resource, &crashk_res);
563 }
564#endif
565}
566
567static void __init setup_memory_end(void)
568{
569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
571}
572
573#ifdef CONFIG_CRASH_DUMP
574
575/*
576 * When kdump is enabled, we have to ensure that no memory from the area
577 * [0 - crashkernel memory size] is set offline - it will be exchanged with
578 * the crashkernel memory region when kdump is triggered. The crashkernel
579 * memory region can never get offlined (pages are unmovable).
580 */
581static int kdump_mem_notifier(struct notifier_block *nb,
582 unsigned long action, void *data)
583{
584 struct memory_notify *arg = data;
585
586 if (action != MEM_GOING_OFFLINE)
587 return NOTIFY_OK;
588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
589 return NOTIFY_BAD;
590 return NOTIFY_OK;
591}
592
593static struct notifier_block kdump_mem_nb = {
594 .notifier_call = kdump_mem_notifier,
595};
596
597#endif
598
599/*
600 * Reserve page tables created by decompressor
601 */
602static void __init reserve_pgtables(void)
603{
604 unsigned long start, end;
605 struct reserved_range *range;
606
607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
608 memblock_reserve(start, end - start);
609}
610
611/*
612 * Reserve memory for kdump kernel to be loaded with kexec
613 */
614static void __init reserve_crashkernel(void)
615{
616#ifdef CONFIG_CRASH_DUMP
617 unsigned long long crash_base, crash_size;
618 phys_addr_t low, high;
619 int rc;
620
621 rc = parse_crashkernel(boot_command_line, ident_map_size,
622 &crash_size, &crash_base, NULL, NULL);
623
624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
626 if (rc || crash_size == 0)
627 return;
628
629 if (memblock.memory.regions[0].size < crash_size) {
630 pr_info("crashkernel reservation failed: %s\n",
631 "first memory chunk must be at least crashkernel size");
632 return;
633 }
634
635 low = crash_base ?: oldmem_data.start;
636 high = low + crash_size;
637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
639 crash_base = low;
640 } else {
641 /* Find suitable area in free memory */
642 low = max_t(unsigned long, crash_size, sclp.hsa_size);
643 high = crash_base ? crash_base + crash_size : ULONG_MAX;
644
645 if (crash_base && crash_base < low) {
646 pr_info("crashkernel reservation failed: %s\n",
647 "crash_base too low");
648 return;
649 }
650 low = crash_base ?: low;
651 crash_base = memblock_phys_alloc_range(crash_size,
652 KEXEC_CRASH_MEM_ALIGN,
653 low, high);
654 }
655
656 if (!crash_base) {
657 pr_info("crashkernel reservation failed: %s\n",
658 "no suitable area found");
659 return;
660 }
661
662 if (register_memory_notifier(&kdump_mem_nb)) {
663 memblock_phys_free(crash_base, crash_size);
664 return;
665 }
666
667 if (!oldmem_data.start && MACHINE_IS_VM)
668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
669 crashk_res.start = crash_base;
670 crashk_res.end = crash_base + crash_size - 1;
671 memblock_remove(crash_base, crash_size);
672 pr_info("Reserving %lluMB of memory at %lluMB "
673 "for crashkernel (System RAM: %luMB)\n",
674 crash_size >> 20, crash_base >> 20,
675 (unsigned long)memblock.memory.total_size >> 20);
676 os_info_crashkernel_add(crash_base, crash_size);
677#endif
678}
679
680/*
681 * Reserve the initrd from being used by memblock
682 */
683static void __init reserve_initrd(void)
684{
685 unsigned long addr, size;
686
687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
688 return;
689 initrd_start = (unsigned long)__va(addr);
690 initrd_end = initrd_start + size;
691 memblock_reserve(addr, size);
692}
693
694/*
695 * Reserve the memory area used to pass the certificate lists
696 */
697static void __init reserve_certificate_list(void)
698{
699 if (ipl_cert_list_addr)
700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
701}
702
703static void __init reserve_physmem_info(void)
704{
705 unsigned long addr, size;
706
707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
708 memblock_reserve(addr, size);
709}
710
711static void __init free_physmem_info(void)
712{
713 unsigned long addr, size;
714
715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
716 memblock_phys_free(addr, size);
717}
718
719static void __init memblock_add_physmem_info(void)
720{
721 unsigned long start, end;
722 int i;
723
724 pr_debug("physmem info source: %s (%hhd)\n",
725 get_physmem_info_source(), physmem_info.info_source);
726 /* keep memblock lists close to the kernel */
727 memblock_set_bottom_up(true);
728 for_each_physmem_usable_range(i, &start, &end)
729 memblock_add(start, end - start);
730 for_each_physmem_online_range(i, &start, &end)
731 memblock_physmem_add(start, end - start);
732 memblock_set_bottom_up(false);
733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
734}
735
736/*
737 * Reserve memory used for lowcore/command line/kernel image.
738 */
739static void __init reserve_kernel(void)
740{
741 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
742 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
743 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
744 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
745 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
746 memblock_reserve(__pa(_stext), _end - _stext);
747}
748
749static void __init setup_memory(void)
750{
751 phys_addr_t start, end;
752 u64 i;
753
754 /*
755 * Init storage key for present memory
756 */
757 for_each_mem_range(i, &start, &end)
758 storage_key_init_range(start, end);
759
760 psw_set_key(PAGE_DEFAULT_KEY);
761}
762
763static void __init relocate_amode31_section(void)
764{
765 unsigned long amode31_size = __eamode31 - __samode31;
766 long amode31_offset, *ptr;
767
768 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31;
769 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
770
771 /* Move original AMODE31 section to the new one */
772 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
773 /* Zero out the old AMODE31 section to catch invalid accesses within it */
774 memset(__samode31, 0, amode31_size);
775
776 /* Update all AMODE31 region references */
777 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
778 *ptr += amode31_offset;
779}
780
781/* This must be called after AMODE31 relocation */
782static void __init setup_cr(void)
783{
784 union ctlreg2 cr2;
785 union ctlreg5 cr5;
786 union ctlreg15 cr15;
787
788 __ctl_duct[1] = (unsigned long)__ctl_aste;
789 __ctl_duct[2] = (unsigned long)__ctl_aste;
790 __ctl_duct[4] = (unsigned long)__ctl_duald;
791
792 /* Update control registers CR2, CR5 and CR15 */
793 local_ctl_store(2, &cr2.reg);
794 local_ctl_store(5, &cr5.reg);
795 local_ctl_store(15, &cr15.reg);
796 cr2.ducto = (unsigned long)__ctl_duct >> 6;
797 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
798 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
799 system_ctl_load(2, &cr2.reg);
800 system_ctl_load(5, &cr5.reg);
801 system_ctl_load(15, &cr15.reg);
802}
803
804/*
805 * Add system information as device randomness
806 */
807static void __init setup_randomness(void)
808{
809 struct sysinfo_3_2_2 *vmms;
810
811 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
812 if (!vmms)
813 panic("Failed to allocate memory for sysinfo structure\n");
814 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
815 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
816 memblock_free(vmms, PAGE_SIZE);
817
818 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
819 static_branch_enable(&s390_arch_random_available);
820}
821
822/*
823 * Issue diagnose 318 to set the control program name and
824 * version codes.
825 */
826static void __init setup_control_program_code(void)
827{
828 union diag318_info diag318_info = {
829 .cpnc = CPNC_LINUX,
830 .cpvc = 0,
831 };
832
833 if (!sclp.has_diag318)
834 return;
835
836 diag_stat_inc(DIAG_STAT_X318);
837 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
838}
839
840/*
841 * Print the component list from the IPL report
842 */
843static void __init log_component_list(void)
844{
845 struct ipl_rb_component_entry *ptr, *end;
846 char *str;
847
848 if (!early_ipl_comp_list_addr)
849 return;
850 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
851 pr_info("Linux is running with Secure-IPL enabled\n");
852 else
853 pr_info("Linux is running with Secure-IPL disabled\n");
854 ptr = __va(early_ipl_comp_list_addr);
855 end = (void *) ptr + early_ipl_comp_list_size;
856 pr_info("The IPL report contains the following components:\n");
857 while (ptr < end) {
858 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
859 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
860 str = "signed, verified";
861 else
862 str = "signed, verification failed";
863 } else {
864 str = "not signed";
865 }
866 pr_info("%016llx - %016llx (%s)\n",
867 ptr->addr, ptr->addr + ptr->len, str);
868 ptr++;
869 }
870}
871
872/*
873 * Setup function called from init/main.c just after the banner
874 * was printed.
875 */
876
877void __init setup_arch(char **cmdline_p)
878{
879 /*
880 * print what head.S has found out about the machine
881 */
882 if (MACHINE_IS_VM)
883 pr_info("Linux is running as a z/VM "
884 "guest operating system in 64-bit mode\n");
885 else if (MACHINE_IS_KVM)
886 pr_info("Linux is running under KVM in 64-bit mode\n");
887 else if (MACHINE_IS_LPAR)
888 pr_info("Linux is running natively in 64-bit mode\n");
889 else
890 pr_info("Linux is running as a guest in 64-bit mode\n");
891
892 log_component_list();
893
894 /* Have one command line that is parsed and saved in /proc/cmdline */
895 /* boot_command_line has been already set up in early.c */
896 *cmdline_p = boot_command_line;
897
898 ROOT_DEV = Root_RAM0;
899
900 setup_initial_init_mm(_text, _etext, _edata, _end);
901
902 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
903 nospec_auto_detect();
904
905 jump_label_init();
906 parse_early_param();
907#ifdef CONFIG_CRASH_DUMP
908 /* Deactivate elfcorehdr= kernel parameter */
909 elfcorehdr_addr = ELFCORE_ADDR_MAX;
910#endif
911
912 os_info_init();
913 setup_ipl();
914 setup_control_program_code();
915
916 /* Do some memory reservations *before* memory is added to memblock */
917 reserve_pgtables();
918 reserve_kernel();
919 reserve_initrd();
920 reserve_certificate_list();
921 reserve_physmem_info();
922 memblock_set_current_limit(ident_map_size);
923 memblock_allow_resize();
924
925 /* Get information about *all* installed memory */
926 memblock_add_physmem_info();
927
928 free_physmem_info();
929 setup_memory_end();
930 memblock_dump_all();
931 setup_memory();
932
933 relocate_amode31_section();
934 setup_cr();
935 setup_uv();
936 dma_contiguous_reserve(ident_map_size);
937 vmcp_cma_reserve();
938 if (MACHINE_HAS_EDAT2)
939 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
940
941 reserve_crashkernel();
942#ifdef CONFIG_CRASH_DUMP
943 /*
944 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
945 * Therefore CPU and device initialization should be done afterwards.
946 */
947 smp_save_dump_secondary_cpus();
948#endif
949
950 setup_resources();
951 setup_lowcore();
952 smp_fill_possible_mask();
953 cpu_detect_mhz_feature();
954 cpu_init();
955 numa_setup();
956 smp_detect_cpus();
957 topology_init_early();
958
959 if (test_facility(193))
960 static_branch_enable(&cpu_has_bear);
961
962 /*
963 * Create kernel page tables.
964 */
965 paging_init();
966
967 /*
968 * After paging_init created the kernel page table, the new PSWs
969 * in lowcore can now run with DAT enabled.
970 */
971#ifdef CONFIG_CRASH_DUMP
972 smp_save_dump_ipl_cpu();
973#endif
974
975 /* Setup default console */
976 conmode_default();
977 set_preferred_console();
978
979 apply_alternative_instructions();
980 if (IS_ENABLED(CONFIG_EXPOLINE))
981 nospec_init_branches();
982
983 /* Setup zfcp/nvme dump support */
984 setup_zfcpdump();
985
986 /* Add system specific data to the random pool */
987 setup_randomness();
988}
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