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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 * 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}