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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);
149struct physmem_info __bootdata(physmem_info);
150
151struct vm_layout __bootdata_preserved(vm_layout);
152EXPORT_SYMBOL(vm_layout);
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);
158struct oldmem_data __bootdata_preserved(oldmem_data);
159
160unsigned long VMALLOC_START;
161EXPORT_SYMBOL(VMALLOC_START);
162
163unsigned long VMALLOC_END;
164EXPORT_SYMBOL(VMALLOC_END);
165
166struct page *vmemmap;
167EXPORT_SYMBOL(vmemmap);
168unsigned long vmemmap_size;
169
170unsigned long MODULES_VADDR;
171unsigned long MODULES_END;
172
173/* An array with a pointer to the lowcore of every CPU. */
174struct lowcore *lowcore_ptr[NR_CPUS];
175EXPORT_SYMBOL(lowcore_ptr);
176
177DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
178
179/*
180 * The Write Back bit position in the physaddr is given by the SLPC PCI.
181 * Leaving the mask zero always uses write through which is safe
182 */
183unsigned long mio_wb_bit_mask __ro_after_init;
184
185/*
186 * This is set up by the setup-routine at boot-time
187 * for S390 need to find out, what we have to setup
188 * using address 0x10400 ...
189 */
190
191#include <asm/setup.h>
192
193/*
194 * condev= and conmode= setup parameter.
195 */
196
197static int __init condev_setup(char *str)
198{
199 int vdev;
200
201 vdev = simple_strtoul(str, &str, 0);
202 if (vdev >= 0 && vdev < 65536) {
203 console_devno = vdev;
204 console_irq = -1;
205 }
206 return 1;
207}
208
209__setup("condev=", condev_setup);
210
211static void __init set_preferred_console(void)
212{
213 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
214 add_preferred_console("ttyS", 0, NULL);
215 else if (CONSOLE_IS_3270)
216 add_preferred_console("tty3270", 0, NULL);
217 else if (CONSOLE_IS_VT220)
218 add_preferred_console("ttysclp", 0, NULL);
219 else if (CONSOLE_IS_HVC)
220 add_preferred_console("hvc", 0, NULL);
221}
222
223static int __init conmode_setup(char *str)
224{
225#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
226 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
227 SET_CONSOLE_SCLP;
228#endif
229#if defined(CONFIG_TN3215_CONSOLE)
230 if (!strcmp(str, "3215"))
231 SET_CONSOLE_3215;
232#endif
233#if defined(CONFIG_TN3270_CONSOLE)
234 if (!strcmp(str, "3270"))
235 SET_CONSOLE_3270;
236#endif
237 set_preferred_console();
238 return 1;
239}
240
241__setup("conmode=", conmode_setup);
242
243static void __init conmode_default(void)
244{
245 char query_buffer[1024];
246 char *ptr;
247
248 if (MACHINE_IS_VM) {
249 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
250 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
251 ptr = strstr(query_buffer, "SUBCHANNEL =");
252 console_irq = simple_strtoul(ptr + 13, NULL, 16);
253 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
254 ptr = strstr(query_buffer, "CONMODE");
255 /*
256 * Set the conmode to 3215 so that the device recognition
257 * will set the cu_type of the console to 3215. If the
258 * conmode is 3270 and we don't set it back then both
259 * 3215 and the 3270 driver will try to access the console
260 * device (3215 as console and 3270 as normal tty).
261 */
262 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
263 if (ptr == NULL) {
264#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
265 SET_CONSOLE_SCLP;
266#endif
267 return;
268 }
269 if (str_has_prefix(ptr + 8, "3270")) {
270#if defined(CONFIG_TN3270_CONSOLE)
271 SET_CONSOLE_3270;
272#elif defined(CONFIG_TN3215_CONSOLE)
273 SET_CONSOLE_3215;
274#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
275 SET_CONSOLE_SCLP;
276#endif
277 } else if (str_has_prefix(ptr + 8, "3215")) {
278#if defined(CONFIG_TN3215_CONSOLE)
279 SET_CONSOLE_3215;
280#elif defined(CONFIG_TN3270_CONSOLE)
281 SET_CONSOLE_3270;
282#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
283 SET_CONSOLE_SCLP;
284#endif
285 }
286 } else if (MACHINE_IS_KVM) {
287 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
288 SET_CONSOLE_VT220;
289 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
290 SET_CONSOLE_SCLP;
291 else
292 SET_CONSOLE_HVC;
293 } else {
294#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
295 SET_CONSOLE_SCLP;
296#endif
297 }
298}
299
300#ifdef CONFIG_CRASH_DUMP
301static void __init setup_zfcpdump(void)
302{
303 if (!is_ipl_type_dump())
304 return;
305 if (oldmem_data.start)
306 return;
307 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
308 console_loglevel = 2;
309}
310#else
311static inline void setup_zfcpdump(void) {}
312#endif /* CONFIG_CRASH_DUMP */
313
314 /*
315 * Reboot, halt and power_off stubs. They just call _machine_restart,
316 * _machine_halt or _machine_power_off.
317 */
318
319void machine_restart(char *command)
320{
321 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
322 /*
323 * Only unblank the console if we are called in enabled
324 * context or a bust_spinlocks cleared the way for us.
325 */
326 console_unblank();
327 _machine_restart(command);
328}
329
330void machine_halt(void)
331{
332 if (!in_interrupt() || oops_in_progress)
333 /*
334 * Only unblank the console if we are called in enabled
335 * context or a bust_spinlocks cleared the way for us.
336 */
337 console_unblank();
338 _machine_halt();
339}
340
341void machine_power_off(void)
342{
343 if (!in_interrupt() || oops_in_progress)
344 /*
345 * Only unblank the console if we are called in enabled
346 * context or a bust_spinlocks cleared the way for us.
347 */
348 console_unblank();
349 _machine_power_off();
350}
351
352/*
353 * Dummy power off function.
354 */
355void (*pm_power_off)(void) = machine_power_off;
356EXPORT_SYMBOL_GPL(pm_power_off);
357
358void *restart_stack;
359
360unsigned long stack_alloc(void)
361{
362#ifdef CONFIG_VMAP_STACK
363 void *ret;
364
365 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
366 NUMA_NO_NODE, __builtin_return_address(0));
367 kmemleak_not_leak(ret);
368 return (unsigned long)ret;
369#else
370 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
371#endif
372}
373
374void stack_free(unsigned long stack)
375{
376#ifdef CONFIG_VMAP_STACK
377 vfree((void *) stack);
378#else
379 free_pages(stack, THREAD_SIZE_ORDER);
380#endif
381}
382
383static unsigned long __init stack_alloc_early(void)
384{
385 unsigned long stack;
386
387 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
388 if (!stack) {
389 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
390 __func__, THREAD_SIZE, THREAD_SIZE);
391 }
392 return stack;
393}
394
395static void __init setup_lowcore(void)
396{
397 struct lowcore *lc, *abs_lc;
398
399 /*
400 * Setup lowcore for boot cpu
401 */
402 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
403 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
404 if (!lc)
405 panic("%s: Failed to allocate %zu bytes align=%zx\n",
406 __func__, sizeof(*lc), sizeof(*lc));
407
408 lc->pcpu = (unsigned long)per_cpu_ptr(&pcpu_devices, 0);
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 = get_lowcore()->machine_flags;
425 lc->preempt_count = get_lowcore()->preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = get_lowcore()->sys_enter_timer;
428 lc->exit_timer = get_lowcore()->exit_timer;
429 lc->user_timer = get_lowcore()->user_timer;
430 lc->system_timer = get_lowcore()->system_timer;
431 lc->steal_timer = get_lowcore()->steal_timer;
432 lc->last_update_timer = get_lowcore()->last_update_timer;
433 lc->last_update_clock = get_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 = get_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 = get_lowcore()->kernel_asce;
459 lc->user_asce = get_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 = __pa_symbol(_text);
508 code_resource.end = __pa_symbol(_etext) - 1;
509 data_resource.start = __pa_symbol(_etext);
510 data_resource.end = __pa_symbol(_edata) - 1;
511 bss_resource.start = __pa_symbol(__bss_start);
512 bss_resource.end = __pa_symbol(__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.
738 */
739static void __init reserve_lowcore(void)
740{
741 void *lowcore_start = get_lowcore();
742 void *lowcore_end = lowcore_start + sizeof(struct lowcore);
743 void *start, *end;
744
745 if ((void *)__identity_base < lowcore_end) {
746 start = max(lowcore_start, (void *)__identity_base);
747 end = min(lowcore_end, (void *)(__identity_base + ident_map_size));
748 memblock_reserve(__pa(start), __pa(end));
749 }
750}
751
752/*
753 * Reserve memory used for absolute lowcore/command line/kernel image.
754 */
755static void __init reserve_kernel(void)
756{
757 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
758 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
759 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
760 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
761 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
762 memblock_reserve(__pa(_stext), _end - _stext);
763}
764
765static void __init setup_memory(void)
766{
767 phys_addr_t start, end;
768 u64 i;
769
770 /*
771 * Init storage key for present memory
772 */
773 for_each_mem_range(i, &start, &end)
774 storage_key_init_range(start, end);
775
776 psw_set_key(PAGE_DEFAULT_KEY);
777}
778
779static void __init relocate_amode31_section(void)
780{
781 unsigned long amode31_size = __eamode31 - __samode31;
782 long amode31_offset, *ptr;
783
784 amode31_offset = AMODE31_START - (unsigned long)__samode31;
785 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
786
787 /* Move original AMODE31 section to the new one */
788 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
789 /* Zero out the old AMODE31 section to catch invalid accesses within it */
790 memset(__samode31, 0, amode31_size);
791
792 /* Update all AMODE31 region references */
793 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
794 *ptr += amode31_offset;
795}
796
797/* This must be called after AMODE31 relocation */
798static void __init setup_cr(void)
799{
800 union ctlreg2 cr2;
801 union ctlreg5 cr5;
802 union ctlreg15 cr15;
803
804 __ctl_duct[1] = (unsigned long)__ctl_aste;
805 __ctl_duct[2] = (unsigned long)__ctl_aste;
806 __ctl_duct[4] = (unsigned long)__ctl_duald;
807
808 /* Update control registers CR2, CR5 and CR15 */
809 local_ctl_store(2, &cr2.reg);
810 local_ctl_store(5, &cr5.reg);
811 local_ctl_store(15, &cr15.reg);
812 cr2.ducto = (unsigned long)__ctl_duct >> 6;
813 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
814 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
815 system_ctl_load(2, &cr2.reg);
816 system_ctl_load(5, &cr5.reg);
817 system_ctl_load(15, &cr15.reg);
818}
819
820/*
821 * Add system information as device randomness
822 */
823static void __init setup_randomness(void)
824{
825 struct sysinfo_3_2_2 *vmms;
826
827 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
828 if (!vmms)
829 panic("Failed to allocate memory for sysinfo structure\n");
830 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
831 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
832 memblock_free(vmms, PAGE_SIZE);
833
834 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
835 static_branch_enable(&s390_arch_random_available);
836}
837
838/*
839 * Issue diagnose 318 to set the control program name and
840 * version codes.
841 */
842static void __init setup_control_program_code(void)
843{
844 union diag318_info diag318_info = {
845 .cpnc = CPNC_LINUX,
846 .cpvc = 0,
847 };
848
849 if (!sclp.has_diag318)
850 return;
851
852 diag_stat_inc(DIAG_STAT_X318);
853 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
854}
855
856/*
857 * Print the component list from the IPL report
858 */
859static void __init log_component_list(void)
860{
861 struct ipl_rb_component_entry *ptr, *end;
862 char *str;
863
864 if (!early_ipl_comp_list_addr)
865 return;
866 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
867 pr_info("Linux is running with Secure-IPL enabled\n");
868 else
869 pr_info("Linux is running with Secure-IPL disabled\n");
870 ptr = __va(early_ipl_comp_list_addr);
871 end = (void *) ptr + early_ipl_comp_list_size;
872 pr_info("The IPL report contains the following components:\n");
873 while (ptr < end) {
874 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
875 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
876 str = "signed, verified";
877 else
878 str = "signed, verification failed";
879 } else {
880 str = "not signed";
881 }
882 pr_info("%016llx - %016llx (%s)\n",
883 ptr->addr, ptr->addr + ptr->len, str);
884 ptr++;
885 }
886}
887
888/*
889 * Setup function called from init/main.c just after the banner
890 * was printed.
891 */
892
893void __init setup_arch(char **cmdline_p)
894{
895 /*
896 * print what head.S has found out about the machine
897 */
898 if (MACHINE_IS_VM)
899 pr_info("Linux is running as a z/VM "
900 "guest operating system in 64-bit mode\n");
901 else if (MACHINE_IS_KVM)
902 pr_info("Linux is running under KVM in 64-bit mode\n");
903 else if (MACHINE_IS_LPAR)
904 pr_info("Linux is running natively in 64-bit mode\n");
905 else
906 pr_info("Linux is running as a guest in 64-bit mode\n");
907
908 if (have_relocated_lowcore())
909 pr_info("Lowcore relocated to 0x%px\n", get_lowcore());
910
911 log_component_list();
912
913 /* Have one command line that is parsed and saved in /proc/cmdline */
914 /* boot_command_line has been already set up in early.c */
915 *cmdline_p = boot_command_line;
916
917 ROOT_DEV = Root_RAM0;
918
919 setup_initial_init_mm(_text, _etext, _edata, _end);
920
921 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
922 nospec_auto_detect();
923
924 jump_label_init();
925 parse_early_param();
926#ifdef CONFIG_CRASH_DUMP
927 /* Deactivate elfcorehdr= kernel parameter */
928 elfcorehdr_addr = ELFCORE_ADDR_MAX;
929#endif
930
931 os_info_init();
932 setup_ipl();
933 setup_control_program_code();
934
935 /* Do some memory reservations *before* memory is added to memblock */
936 reserve_pgtables();
937 reserve_lowcore();
938 reserve_kernel();
939 reserve_initrd();
940 reserve_certificate_list();
941 reserve_physmem_info();
942 memblock_set_current_limit(ident_map_size);
943 memblock_allow_resize();
944
945 /* Get information about *all* installed memory */
946 memblock_add_physmem_info();
947
948 free_physmem_info();
949 setup_memory_end();
950 memblock_dump_all();
951 setup_memory();
952
953 relocate_amode31_section();
954 setup_cr();
955 setup_uv();
956 dma_contiguous_reserve(ident_map_size);
957 vmcp_cma_reserve();
958 if (MACHINE_HAS_EDAT2)
959 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
960
961 reserve_crashkernel();
962#ifdef CONFIG_CRASH_DUMP
963 /*
964 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
965 * Therefore CPU and device initialization should be done afterwards.
966 */
967 smp_save_dump_secondary_cpus();
968#endif
969
970 setup_resources();
971 setup_lowcore();
972 smp_fill_possible_mask();
973 cpu_detect_mhz_feature();
974 cpu_init();
975 numa_setup();
976 smp_detect_cpus();
977 topology_init_early();
978
979 if (test_facility(193))
980 static_branch_enable(&cpu_has_bear);
981
982 /*
983 * Create kernel page tables.
984 */
985 paging_init();
986
987 /*
988 * After paging_init created the kernel page table, the new PSWs
989 * in lowcore can now run with DAT enabled.
990 */
991#ifdef CONFIG_CRASH_DUMP
992 smp_save_dump_ipl_cpu();
993#endif
994
995 /* Setup default console */
996 conmode_default();
997 set_preferred_console();
998
999 apply_alternative_instructions();
1000 if (IS_ENABLED(CONFIG_EXPOLINE))
1001 nospec_init_branches();
1002
1003 /* Setup zfcp/nvme dump support */
1004 setup_zfcpdump();
1005
1006 /* Add system specific data to the random pool */
1007 setup_randomness();
1008}
1009
1010void __init arch_cpu_finalize_init(void)
1011{
1012 sclp_init();
1013}
1/*
2 * arch/s390/kernel/setup.c
3 *
4 * S390 version
5 * Copyright (C) IBM Corp. 1999,2012
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
11 */
12
13/*
14 * This file handles the architecture-dependent parts of initialization
15 */
16
17#define KMSG_COMPONENT "setup"
18#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20#include <linux/errno.h>
21#include <linux/module.h>
22#include <linux/sched.h>
23#include <linux/kernel.h>
24#include <linux/memblock.h>
25#include <linux/mm.h>
26#include <linux/stddef.h>
27#include <linux/unistd.h>
28#include <linux/ptrace.h>
29#include <linux/user.h>
30#include <linux/tty.h>
31#include <linux/ioport.h>
32#include <linux/delay.h>
33#include <linux/init.h>
34#include <linux/initrd.h>
35#include <linux/bootmem.h>
36#include <linux/root_dev.h>
37#include <linux/console.h>
38#include <linux/kernel_stat.h>
39#include <linux/device.h>
40#include <linux/notifier.h>
41#include <linux/pfn.h>
42#include <linux/ctype.h>
43#include <linux/reboot.h>
44#include <linux/topology.h>
45#include <linux/ftrace.h>
46#include <linux/kexec.h>
47#include <linux/crash_dump.h>
48#include <linux/memory.h>
49#include <linux/compat.h>
50
51#include <asm/ipl.h>
52#include <asm/uaccess.h>
53#include <asm/facility.h>
54#include <asm/smp.h>
55#include <asm/mmu_context.h>
56#include <asm/cpcmd.h>
57#include <asm/lowcore.h>
58#include <asm/irq.h>
59#include <asm/page.h>
60#include <asm/ptrace.h>
61#include <asm/sections.h>
62#include <asm/ebcdic.h>
63#include <asm/kvm_virtio.h>
64#include <asm/diag.h>
65#include <asm/os_info.h>
66#include "entry.h"
67
68long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
69 PSW_MASK_EA | PSW_MASK_BA;
70long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
71 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
72 PSW_MASK_PSTATE | PSW_ASC_HOME;
73
74/*
75 * User copy operations.
76 */
77struct uaccess_ops uaccess;
78EXPORT_SYMBOL(uaccess);
79
80/*
81 * Machine setup..
82 */
83unsigned int console_mode = 0;
84EXPORT_SYMBOL(console_mode);
85
86unsigned int console_devno = -1;
87EXPORT_SYMBOL(console_devno);
88
89unsigned int console_irq = -1;
90EXPORT_SYMBOL(console_irq);
91
92unsigned long elf_hwcap = 0;
93char elf_platform[ELF_PLATFORM_SIZE];
94
95struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
96
97int __initdata memory_end_set;
98unsigned long __initdata memory_end;
99
100unsigned long VMALLOC_START;
101EXPORT_SYMBOL(VMALLOC_START);
102
103unsigned long VMALLOC_END;
104EXPORT_SYMBOL(VMALLOC_END);
105
106struct page *vmemmap;
107EXPORT_SYMBOL(vmemmap);
108
109/* An array with a pointer to the lowcore of every CPU. */
110struct _lowcore *lowcore_ptr[NR_CPUS];
111EXPORT_SYMBOL(lowcore_ptr);
112
113/*
114 * This is set up by the setup-routine at boot-time
115 * for S390 need to find out, what we have to setup
116 * using address 0x10400 ...
117 */
118
119#include <asm/setup.h>
120
121/*
122 * condev= and conmode= setup parameter.
123 */
124
125static int __init condev_setup(char *str)
126{
127 int vdev;
128
129 vdev = simple_strtoul(str, &str, 0);
130 if (vdev >= 0 && vdev < 65536) {
131 console_devno = vdev;
132 console_irq = -1;
133 }
134 return 1;
135}
136
137__setup("condev=", condev_setup);
138
139static void __init set_preferred_console(void)
140{
141 if (MACHINE_IS_KVM)
142 add_preferred_console("hvc", 0, NULL);
143 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
144 add_preferred_console("ttyS", 0, NULL);
145 else if (CONSOLE_IS_3270)
146 add_preferred_console("tty3270", 0, NULL);
147}
148
149static int __init conmode_setup(char *str)
150{
151#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
152 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
153 SET_CONSOLE_SCLP;
154#endif
155#if defined(CONFIG_TN3215_CONSOLE)
156 if (strncmp(str, "3215", 5) == 0)
157 SET_CONSOLE_3215;
158#endif
159#if defined(CONFIG_TN3270_CONSOLE)
160 if (strncmp(str, "3270", 5) == 0)
161 SET_CONSOLE_3270;
162#endif
163 set_preferred_console();
164 return 1;
165}
166
167__setup("conmode=", conmode_setup);
168
169static void __init conmode_default(void)
170{
171 char query_buffer[1024];
172 char *ptr;
173
174 if (MACHINE_IS_VM) {
175 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
176 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
177 ptr = strstr(query_buffer, "SUBCHANNEL =");
178 console_irq = simple_strtoul(ptr + 13, NULL, 16);
179 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
180 ptr = strstr(query_buffer, "CONMODE");
181 /*
182 * Set the conmode to 3215 so that the device recognition
183 * will set the cu_type of the console to 3215. If the
184 * conmode is 3270 and we don't set it back then both
185 * 3215 and the 3270 driver will try to access the console
186 * device (3215 as console and 3270 as normal tty).
187 */
188 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
189 if (ptr == NULL) {
190#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
191 SET_CONSOLE_SCLP;
192#endif
193 return;
194 }
195 if (strncmp(ptr + 8, "3270", 4) == 0) {
196#if defined(CONFIG_TN3270_CONSOLE)
197 SET_CONSOLE_3270;
198#elif defined(CONFIG_TN3215_CONSOLE)
199 SET_CONSOLE_3215;
200#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 SET_CONSOLE_SCLP;
202#endif
203 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
204#if defined(CONFIG_TN3215_CONSOLE)
205 SET_CONSOLE_3215;
206#elif defined(CONFIG_TN3270_CONSOLE)
207 SET_CONSOLE_3270;
208#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 SET_CONSOLE_SCLP;
210#endif
211 }
212 } else {
213#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
214 SET_CONSOLE_SCLP;
215#endif
216 }
217}
218
219#ifdef CONFIG_ZFCPDUMP
220static void __init setup_zfcpdump(unsigned int console_devno)
221{
222 static char str[41];
223
224 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
225 return;
226 if (OLDMEM_BASE)
227 return;
228 if (console_devno != -1)
229 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
230 ipl_info.data.fcp.dev_id.devno, console_devno);
231 else
232 sprintf(str, " cio_ignore=all,!0.0.%04x",
233 ipl_info.data.fcp.dev_id.devno);
234 strcat(boot_command_line, str);
235 console_loglevel = 2;
236}
237#else
238static inline void setup_zfcpdump(unsigned int console_devno) {}
239#endif /* CONFIG_ZFCPDUMP */
240
241 /*
242 * Reboot, halt and power_off stubs. They just call _machine_restart,
243 * _machine_halt or _machine_power_off.
244 */
245
246void machine_restart(char *command)
247{
248 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
249 /*
250 * Only unblank the console if we are called in enabled
251 * context or a bust_spinlocks cleared the way for us.
252 */
253 console_unblank();
254 _machine_restart(command);
255}
256
257void machine_halt(void)
258{
259 if (!in_interrupt() || oops_in_progress)
260 /*
261 * Only unblank the console if we are called in enabled
262 * context or a bust_spinlocks cleared the way for us.
263 */
264 console_unblank();
265 _machine_halt();
266}
267
268void machine_power_off(void)
269{
270 if (!in_interrupt() || oops_in_progress)
271 /*
272 * Only unblank the console if we are called in enabled
273 * context or a bust_spinlocks cleared the way for us.
274 */
275 console_unblank();
276 _machine_power_off();
277}
278
279/*
280 * Dummy power off function.
281 */
282void (*pm_power_off)(void) = machine_power_off;
283
284static int __init early_parse_mem(char *p)
285{
286 memory_end = memparse(p, &p);
287 memory_end_set = 1;
288 return 0;
289}
290early_param("mem", early_parse_mem);
291
292static int __init parse_vmalloc(char *arg)
293{
294 if (!arg)
295 return -EINVAL;
296 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
297 return 0;
298}
299early_param("vmalloc", parse_vmalloc);
300
301unsigned int user_mode = HOME_SPACE_MODE;
302EXPORT_SYMBOL_GPL(user_mode);
303
304static int set_amode_primary(void)
305{
306 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
307 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
308#ifdef CONFIG_COMPAT
309 psw32_user_bits =
310 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
311#endif
312
313 if (MACHINE_HAS_MVCOS) {
314 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
315 return 1;
316 } else {
317 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
318 return 0;
319 }
320}
321
322/*
323 * Switch kernel/user addressing modes?
324 */
325static int __init early_parse_switch_amode(char *p)
326{
327 user_mode = PRIMARY_SPACE_MODE;
328 return 0;
329}
330early_param("switch_amode", early_parse_switch_amode);
331
332static int __init early_parse_user_mode(char *p)
333{
334 if (p && strcmp(p, "primary") == 0)
335 user_mode = PRIMARY_SPACE_MODE;
336 else if (!p || strcmp(p, "home") == 0)
337 user_mode = HOME_SPACE_MODE;
338 else
339 return 1;
340 return 0;
341}
342early_param("user_mode", early_parse_user_mode);
343
344static void setup_addressing_mode(void)
345{
346 if (user_mode == PRIMARY_SPACE_MODE) {
347 if (set_amode_primary())
348 pr_info("Address spaces switched, "
349 "mvcos available\n");
350 else
351 pr_info("Address spaces switched, "
352 "mvcos not available\n");
353 }
354}
355
356void *restart_stack __attribute__((__section__(".data")));
357
358static void __init setup_lowcore(void)
359{
360 struct _lowcore *lc;
361
362 /*
363 * Setup lowcore for boot cpu
364 */
365 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
366 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
367 lc->restart_psw.mask = psw_kernel_bits;
368 lc->restart_psw.addr =
369 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
370 lc->external_new_psw.mask = psw_kernel_bits |
371 PSW_MASK_DAT | PSW_MASK_MCHECK;
372 lc->external_new_psw.addr =
373 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
374 lc->svc_new_psw.mask = psw_kernel_bits |
375 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
376 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
377 lc->program_new_psw.mask = psw_kernel_bits |
378 PSW_MASK_DAT | PSW_MASK_MCHECK;
379 lc->program_new_psw.addr =
380 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
381 lc->mcck_new_psw.mask = psw_kernel_bits;
382 lc->mcck_new_psw.addr =
383 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
384 lc->io_new_psw.mask = psw_kernel_bits |
385 PSW_MASK_DAT | PSW_MASK_MCHECK;
386 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
387 lc->clock_comparator = -1ULL;
388 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
389 lc->async_stack = (unsigned long)
390 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
391 lc->panic_stack = (unsigned long)
392 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
393 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
394 lc->thread_info = (unsigned long) &init_thread_union;
395 lc->machine_flags = S390_lowcore.machine_flags;
396 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
397 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
398 MAX_FACILITY_BIT/8);
399#ifndef CONFIG_64BIT
400 if (MACHINE_HAS_IEEE) {
401 lc->extended_save_area_addr = (__u32)
402 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
403 /* enable extended save area */
404 __ctl_set_bit(14, 29);
405 }
406#else
407 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
408#endif
409 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
410 lc->async_enter_timer = S390_lowcore.async_enter_timer;
411 lc->exit_timer = S390_lowcore.exit_timer;
412 lc->user_timer = S390_lowcore.user_timer;
413 lc->system_timer = S390_lowcore.system_timer;
414 lc->steal_timer = S390_lowcore.steal_timer;
415 lc->last_update_timer = S390_lowcore.last_update_timer;
416 lc->last_update_clock = S390_lowcore.last_update_clock;
417 lc->ftrace_func = S390_lowcore.ftrace_func;
418
419 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
420 restart_stack += ASYNC_SIZE;
421
422 /*
423 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
424 * restart data to the absolute zero lowcore. This is necesary if
425 * PSW restart is done on an offline CPU that has lowcore zero.
426 */
427 lc->restart_stack = (unsigned long) restart_stack;
428 lc->restart_fn = (unsigned long) do_restart;
429 lc->restart_data = 0;
430 lc->restart_source = -1UL;
431
432 /* Setup absolute zero lowcore */
433 memcpy_absolute(&S390_lowcore.restart_stack, &lc->restart_stack,
434 4 * sizeof(unsigned long));
435 memcpy_absolute(&S390_lowcore.restart_psw, &lc->restart_psw,
436 sizeof(lc->restart_psw));
437
438 set_prefix((u32)(unsigned long) lc);
439 lowcore_ptr[0] = lc;
440}
441
442static struct resource code_resource = {
443 .name = "Kernel code",
444 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
445};
446
447static struct resource data_resource = {
448 .name = "Kernel data",
449 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
450};
451
452static struct resource bss_resource = {
453 .name = "Kernel bss",
454 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
455};
456
457static struct resource __initdata *standard_resources[] = {
458 &code_resource,
459 &data_resource,
460 &bss_resource,
461};
462
463static void __init setup_resources(void)
464{
465 struct resource *res, *std_res, *sub_res;
466 int i, j;
467
468 code_resource.start = (unsigned long) &_text;
469 code_resource.end = (unsigned long) &_etext - 1;
470 data_resource.start = (unsigned long) &_etext;
471 data_resource.end = (unsigned long) &_edata - 1;
472 bss_resource.start = (unsigned long) &__bss_start;
473 bss_resource.end = (unsigned long) &__bss_stop - 1;
474
475 for (i = 0; i < MEMORY_CHUNKS; i++) {
476 if (!memory_chunk[i].size)
477 continue;
478 if (memory_chunk[i].type == CHUNK_OLDMEM ||
479 memory_chunk[i].type == CHUNK_CRASHK)
480 continue;
481 res = alloc_bootmem_low(sizeof(*res));
482 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
483 switch (memory_chunk[i].type) {
484 case CHUNK_READ_WRITE:
485 case CHUNK_CRASHK:
486 res->name = "System RAM";
487 break;
488 case CHUNK_READ_ONLY:
489 res->name = "System ROM";
490 res->flags |= IORESOURCE_READONLY;
491 break;
492 default:
493 res->name = "reserved";
494 }
495 res->start = memory_chunk[i].addr;
496 res->end = res->start + memory_chunk[i].size - 1;
497 request_resource(&iomem_resource, res);
498
499 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
500 std_res = standard_resources[j];
501 if (std_res->start < res->start ||
502 std_res->start > res->end)
503 continue;
504 if (std_res->end > res->end) {
505 sub_res = alloc_bootmem_low(sizeof(*sub_res));
506 *sub_res = *std_res;
507 sub_res->end = res->end;
508 std_res->start = res->end + 1;
509 request_resource(res, sub_res);
510 } else {
511 request_resource(res, std_res);
512 }
513 }
514 }
515}
516
517unsigned long real_memory_size;
518EXPORT_SYMBOL_GPL(real_memory_size);
519
520static void __init setup_memory_end(void)
521{
522 unsigned long vmax, vmalloc_size, tmp;
523 int i;
524
525
526#ifdef CONFIG_ZFCPDUMP
527 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
528 memory_end = ZFCPDUMP_HSA_SIZE;
529 memory_end_set = 1;
530 }
531#endif
532 real_memory_size = 0;
533 memory_end &= PAGE_MASK;
534
535 /*
536 * Make sure all chunks are MAX_ORDER aligned so we don't need the
537 * extra checks that HOLES_IN_ZONE would require.
538 */
539 for (i = 0; i < MEMORY_CHUNKS; i++) {
540 unsigned long start, end;
541 struct mem_chunk *chunk;
542 unsigned long align;
543
544 chunk = &memory_chunk[i];
545 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
546 start = (chunk->addr + align - 1) & ~(align - 1);
547 end = (chunk->addr + chunk->size) & ~(align - 1);
548 if (start >= end)
549 memset(chunk, 0, sizeof(*chunk));
550 else {
551 chunk->addr = start;
552 chunk->size = end - start;
553 }
554 real_memory_size = max(real_memory_size,
555 chunk->addr + chunk->size);
556 }
557
558 /* Choose kernel address space layout: 2, 3, or 4 levels. */
559#ifdef CONFIG_64BIT
560 vmalloc_size = VMALLOC_END ?: 128UL << 30;
561 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
562 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
563 if (tmp <= (1UL << 42))
564 vmax = 1UL << 42; /* 3-level kernel page table */
565 else
566 vmax = 1UL << 53; /* 4-level kernel page table */
567#else
568 vmalloc_size = VMALLOC_END ?: 96UL << 20;
569 vmax = 1UL << 31; /* 2-level kernel page table */
570#endif
571 /* vmalloc area is at the end of the kernel address space. */
572 VMALLOC_END = vmax;
573 VMALLOC_START = vmax - vmalloc_size;
574
575 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
576 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
577 tmp = VMALLOC_START - tmp * sizeof(struct page);
578 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
579 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
580 vmemmap = (struct page *) tmp;
581
582 /* Take care that memory_end is set and <= vmemmap */
583 memory_end = min(memory_end ?: real_memory_size, tmp);
584
585 /* Fixup memory chunk array to fit into 0..memory_end */
586 for (i = 0; i < MEMORY_CHUNKS; i++) {
587 struct mem_chunk *chunk = &memory_chunk[i];
588
589 if (chunk->addr >= memory_end) {
590 memset(chunk, 0, sizeof(*chunk));
591 continue;
592 }
593 if (chunk->addr + chunk->size > memory_end)
594 chunk->size = memory_end - chunk->addr;
595 }
596}
597
598static void __init setup_vmcoreinfo(void)
599{
600#ifdef CONFIG_KEXEC
601 unsigned long ptr = paddr_vmcoreinfo_note();
602
603 memcpy_absolute(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
604#endif
605}
606
607#ifdef CONFIG_CRASH_DUMP
608
609/*
610 * Find suitable location for crashkernel memory
611 */
612static unsigned long __init find_crash_base(unsigned long crash_size,
613 char **msg)
614{
615 unsigned long crash_base;
616 struct mem_chunk *chunk;
617 int i;
618
619 if (memory_chunk[0].size < crash_size) {
620 *msg = "first memory chunk must be at least crashkernel size";
621 return 0;
622 }
623 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
624 return OLDMEM_BASE;
625
626 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
627 chunk = &memory_chunk[i];
628 if (chunk->size == 0)
629 continue;
630 if (chunk->type != CHUNK_READ_WRITE)
631 continue;
632 if (chunk->size < crash_size)
633 continue;
634 crash_base = (chunk->addr + chunk->size) - crash_size;
635 if (crash_base < crash_size)
636 continue;
637 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
638 continue;
639 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
640 continue;
641 return crash_base;
642 }
643 *msg = "no suitable area found";
644 return 0;
645}
646
647/*
648 * Check if crash_base and crash_size is valid
649 */
650static int __init verify_crash_base(unsigned long crash_base,
651 unsigned long crash_size,
652 char **msg)
653{
654 struct mem_chunk *chunk;
655 int i;
656
657 /*
658 * Because we do the swap to zero, we must have at least 'crash_size'
659 * bytes free space before crash_base
660 */
661 if (crash_size > crash_base) {
662 *msg = "crashkernel offset must be greater than size";
663 return -EINVAL;
664 }
665
666 /* First memory chunk must be at least crash_size */
667 if (memory_chunk[0].size < crash_size) {
668 *msg = "first memory chunk must be at least crashkernel size";
669 return -EINVAL;
670 }
671 /* Check if we fit into the respective memory chunk */
672 for (i = 0; i < MEMORY_CHUNKS; i++) {
673 chunk = &memory_chunk[i];
674 if (chunk->size == 0)
675 continue;
676 if (crash_base < chunk->addr)
677 continue;
678 if (crash_base >= chunk->addr + chunk->size)
679 continue;
680 /* we have found the memory chunk */
681 if (crash_base + crash_size > chunk->addr + chunk->size) {
682 *msg = "selected memory chunk is too small for "
683 "crashkernel memory";
684 return -EINVAL;
685 }
686 return 0;
687 }
688 *msg = "invalid memory range specified";
689 return -EINVAL;
690}
691
692/*
693 * Reserve kdump memory by creating a memory hole in the mem_chunk array
694 */
695static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
696 int type)
697{
698 create_mem_hole(memory_chunk, addr, size, type);
699}
700
701/*
702 * When kdump is enabled, we have to ensure that no memory from
703 * the area [0 - crashkernel memory size] and
704 * [crashk_res.start - crashk_res.end] is set offline.
705 */
706static int kdump_mem_notifier(struct notifier_block *nb,
707 unsigned long action, void *data)
708{
709 struct memory_notify *arg = data;
710
711 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
712 return NOTIFY_BAD;
713 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
714 return NOTIFY_OK;
715 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
716 return NOTIFY_OK;
717 return NOTIFY_BAD;
718}
719
720static struct notifier_block kdump_mem_nb = {
721 .notifier_call = kdump_mem_notifier,
722};
723
724#endif
725
726/*
727 * Make sure that oldmem, where the dump is stored, is protected
728 */
729static void reserve_oldmem(void)
730{
731#ifdef CONFIG_CRASH_DUMP
732 if (!OLDMEM_BASE)
733 return;
734
735 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
736 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
737 CHUNK_OLDMEM);
738 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
739 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
740 else
741 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
742#endif
743}
744
745/*
746 * Reserve memory for kdump kernel to be loaded with kexec
747 */
748static void __init reserve_crashkernel(void)
749{
750#ifdef CONFIG_CRASH_DUMP
751 unsigned long long crash_base, crash_size;
752 char *msg = NULL;
753 int rc;
754
755 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
756 &crash_base);
757 if (rc || crash_size == 0)
758 return;
759 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
760 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
761 if (register_memory_notifier(&kdump_mem_nb))
762 return;
763 if (!crash_base)
764 crash_base = find_crash_base(crash_size, &msg);
765 if (!crash_base) {
766 pr_info("crashkernel reservation failed: %s\n", msg);
767 unregister_memory_notifier(&kdump_mem_nb);
768 return;
769 }
770 if (verify_crash_base(crash_base, crash_size, &msg)) {
771 pr_info("crashkernel reservation failed: %s\n", msg);
772 unregister_memory_notifier(&kdump_mem_nb);
773 return;
774 }
775 if (!OLDMEM_BASE && MACHINE_IS_VM)
776 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
777 crashk_res.start = crash_base;
778 crashk_res.end = crash_base + crash_size - 1;
779 insert_resource(&iomem_resource, &crashk_res);
780 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
781 pr_info("Reserving %lluMB of memory at %lluMB "
782 "for crashkernel (System RAM: %luMB)\n",
783 crash_size >> 20, crash_base >> 20, memory_end >> 20);
784 os_info_crashkernel_add(crash_base, crash_size);
785#endif
786}
787
788static void __init setup_memory(void)
789{
790 unsigned long bootmap_size;
791 unsigned long start_pfn, end_pfn;
792 int i;
793
794 /*
795 * partially used pages are not usable - thus
796 * we are rounding upwards:
797 */
798 start_pfn = PFN_UP(__pa(&_end));
799 end_pfn = max_pfn = PFN_DOWN(memory_end);
800
801#ifdef CONFIG_BLK_DEV_INITRD
802 /*
803 * Move the initrd in case the bitmap of the bootmem allocater
804 * would overwrite it.
805 */
806
807 if (INITRD_START && INITRD_SIZE) {
808 unsigned long bmap_size;
809 unsigned long start;
810
811 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
812 bmap_size = PFN_PHYS(bmap_size);
813
814 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
815 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
816
817#ifdef CONFIG_CRASH_DUMP
818 if (OLDMEM_BASE) {
819 /* Move initrd behind kdump oldmem */
820 if (start + INITRD_SIZE > OLDMEM_BASE &&
821 start < OLDMEM_BASE + OLDMEM_SIZE)
822 start = OLDMEM_BASE + OLDMEM_SIZE;
823 }
824#endif
825 if (start + INITRD_SIZE > memory_end) {
826 pr_err("initrd extends beyond end of "
827 "memory (0x%08lx > 0x%08lx) "
828 "disabling initrd\n",
829 start + INITRD_SIZE, memory_end);
830 INITRD_START = INITRD_SIZE = 0;
831 } else {
832 pr_info("Moving initrd (0x%08lx -> "
833 "0x%08lx, size: %ld)\n",
834 INITRD_START, start, INITRD_SIZE);
835 memmove((void *) start, (void *) INITRD_START,
836 INITRD_SIZE);
837 INITRD_START = start;
838 }
839 }
840 }
841#endif
842
843 /*
844 * Initialize the boot-time allocator
845 */
846 bootmap_size = init_bootmem(start_pfn, end_pfn);
847
848 /*
849 * Register RAM areas with the bootmem allocator.
850 */
851
852 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
853 unsigned long start_chunk, end_chunk, pfn;
854
855 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
856 memory_chunk[i].type != CHUNK_CRASHK)
857 continue;
858 start_chunk = PFN_DOWN(memory_chunk[i].addr);
859 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
860 end_chunk = min(end_chunk, end_pfn);
861 if (start_chunk >= end_chunk)
862 continue;
863 memblock_add_node(PFN_PHYS(start_chunk),
864 PFN_PHYS(end_chunk - start_chunk), 0);
865 pfn = max(start_chunk, start_pfn);
866 for (; pfn < end_chunk; pfn++)
867 page_set_storage_key(PFN_PHYS(pfn),
868 PAGE_DEFAULT_KEY, 0);
869 }
870
871 psw_set_key(PAGE_DEFAULT_KEY);
872
873 free_bootmem_with_active_regions(0, max_pfn);
874
875 /*
876 * Reserve memory used for lowcore/command line/kernel image.
877 */
878 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
879 reserve_bootmem((unsigned long)_stext,
880 PFN_PHYS(start_pfn) - (unsigned long)_stext,
881 BOOTMEM_DEFAULT);
882 /*
883 * Reserve the bootmem bitmap itself as well. We do this in two
884 * steps (first step was init_bootmem()) because this catches
885 * the (very unlikely) case of us accidentally initializing the
886 * bootmem allocator with an invalid RAM area.
887 */
888 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
889 BOOTMEM_DEFAULT);
890
891#ifdef CONFIG_CRASH_DUMP
892 if (crashk_res.start)
893 reserve_bootmem(crashk_res.start,
894 crashk_res.end - crashk_res.start + 1,
895 BOOTMEM_DEFAULT);
896 if (is_kdump_kernel())
897 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
898 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
899#endif
900#ifdef CONFIG_BLK_DEV_INITRD
901 if (INITRD_START && INITRD_SIZE) {
902 if (INITRD_START + INITRD_SIZE <= memory_end) {
903 reserve_bootmem(INITRD_START, INITRD_SIZE,
904 BOOTMEM_DEFAULT);
905 initrd_start = INITRD_START;
906 initrd_end = initrd_start + INITRD_SIZE;
907 } else {
908 pr_err("initrd extends beyond end of "
909 "memory (0x%08lx > 0x%08lx) "
910 "disabling initrd\n",
911 initrd_start + INITRD_SIZE, memory_end);
912 initrd_start = initrd_end = 0;
913 }
914 }
915#endif
916}
917
918/*
919 * Setup hardware capabilities.
920 */
921static void __init setup_hwcaps(void)
922{
923 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
924 struct cpuid cpu_id;
925 int i;
926
927 /*
928 * The store facility list bits numbers as found in the principles
929 * of operation are numbered with bit 1UL<<31 as number 0 to
930 * bit 1UL<<0 as number 31.
931 * Bit 0: instructions named N3, "backported" to esa-mode
932 * Bit 2: z/Architecture mode is active
933 * Bit 7: the store-facility-list-extended facility is installed
934 * Bit 17: the message-security assist is installed
935 * Bit 19: the long-displacement facility is installed
936 * Bit 21: the extended-immediate facility is installed
937 * Bit 22: extended-translation facility 3 is installed
938 * Bit 30: extended-translation facility 3 enhancement facility
939 * These get translated to:
940 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
941 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
942 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
943 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
944 */
945 for (i = 0; i < 6; i++)
946 if (test_facility(stfl_bits[i]))
947 elf_hwcap |= 1UL << i;
948
949 if (test_facility(22) && test_facility(30))
950 elf_hwcap |= HWCAP_S390_ETF3EH;
951
952 /*
953 * Check for additional facilities with store-facility-list-extended.
954 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
955 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
956 * as stored by stfl, bits 32-xxx contain additional facilities.
957 * How many facility words are stored depends on the number of
958 * doublewords passed to the instruction. The additional facilities
959 * are:
960 * Bit 42: decimal floating point facility is installed
961 * Bit 44: perform floating point operation facility is installed
962 * translated to:
963 * HWCAP_S390_DFP bit 6 (42 && 44).
964 */
965 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
966 elf_hwcap |= HWCAP_S390_DFP;
967
968 /*
969 * Huge page support HWCAP_S390_HPAGE is bit 7.
970 */
971 if (MACHINE_HAS_HPAGE)
972 elf_hwcap |= HWCAP_S390_HPAGE;
973
974 /*
975 * 64-bit register support for 31-bit processes
976 * HWCAP_S390_HIGH_GPRS is bit 9.
977 */
978 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
979
980 get_cpu_id(&cpu_id);
981 switch (cpu_id.machine) {
982 case 0x9672:
983#if !defined(CONFIG_64BIT)
984 default: /* Use "g5" as default for 31 bit kernels. */
985#endif
986 strcpy(elf_platform, "g5");
987 break;
988 case 0x2064:
989 case 0x2066:
990#if defined(CONFIG_64BIT)
991 default: /* Use "z900" as default for 64 bit kernels. */
992#endif
993 strcpy(elf_platform, "z900");
994 break;
995 case 0x2084:
996 case 0x2086:
997 strcpy(elf_platform, "z990");
998 break;
999 case 0x2094:
1000 case 0x2096:
1001 strcpy(elf_platform, "z9-109");
1002 break;
1003 case 0x2097:
1004 case 0x2098:
1005 strcpy(elf_platform, "z10");
1006 break;
1007 case 0x2817:
1008 case 0x2818:
1009 strcpy(elf_platform, "z196");
1010 break;
1011 }
1012}
1013
1014/*
1015 * Setup function called from init/main.c just after the banner
1016 * was printed.
1017 */
1018
1019void __init setup_arch(char **cmdline_p)
1020{
1021 /*
1022 * print what head.S has found out about the machine
1023 */
1024#ifndef CONFIG_64BIT
1025 if (MACHINE_IS_VM)
1026 pr_info("Linux is running as a z/VM "
1027 "guest operating system in 31-bit mode\n");
1028 else if (MACHINE_IS_LPAR)
1029 pr_info("Linux is running natively in 31-bit mode\n");
1030 if (MACHINE_HAS_IEEE)
1031 pr_info("The hardware system has IEEE compatible "
1032 "floating point units\n");
1033 else
1034 pr_info("The hardware system has no IEEE compatible "
1035 "floating point units\n");
1036#else /* CONFIG_64BIT */
1037 if (MACHINE_IS_VM)
1038 pr_info("Linux is running as a z/VM "
1039 "guest operating system in 64-bit mode\n");
1040 else if (MACHINE_IS_KVM)
1041 pr_info("Linux is running under KVM in 64-bit mode\n");
1042 else if (MACHINE_IS_LPAR)
1043 pr_info("Linux is running natively in 64-bit mode\n");
1044#endif /* CONFIG_64BIT */
1045
1046 /* Have one command line that is parsed and saved in /proc/cmdline */
1047 /* boot_command_line has been already set up in early.c */
1048 *cmdline_p = boot_command_line;
1049
1050 ROOT_DEV = Root_RAM0;
1051
1052 init_mm.start_code = PAGE_OFFSET;
1053 init_mm.end_code = (unsigned long) &_etext;
1054 init_mm.end_data = (unsigned long) &_edata;
1055 init_mm.brk = (unsigned long) &_end;
1056
1057 if (MACHINE_HAS_MVCOS)
1058 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1059 else
1060 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1061
1062 parse_early_param();
1063
1064 os_info_init();
1065 setup_ipl();
1066 setup_memory_end();
1067 setup_addressing_mode();
1068 reserve_oldmem();
1069 reserve_crashkernel();
1070 setup_memory();
1071 setup_resources();
1072 setup_vmcoreinfo();
1073 setup_lowcore();
1074
1075 cpu_init();
1076 s390_init_cpu_topology();
1077
1078 /*
1079 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1080 */
1081 setup_hwcaps();
1082
1083 /*
1084 * Create kernel page tables and switch to virtual addressing.
1085 */
1086 paging_init();
1087
1088 /* Setup default console */
1089 conmode_default();
1090 set_preferred_console();
1091
1092 /* Setup zfcpdump support */
1093 setup_zfcpdump(console_devno);
1094}