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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. 1999,2010
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/mm.h>
25#include <linux/stddef.h>
26#include <linux/unistd.h>
27#include <linux/ptrace.h>
28#include <linux/user.h>
29#include <linux/tty.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/kernel_stat.h>
38#include <linux/device.h>
39#include <linux/notifier.h>
40#include <linux/pfn.h>
41#include <linux/ctype.h>
42#include <linux/reboot.h>
43#include <linux/topology.h>
44#include <linux/ftrace.h>
45
46#include <asm/ipl.h>
47#include <asm/uaccess.h>
48#include <asm/system.h>
49#include <asm/smp.h>
50#include <asm/mmu_context.h>
51#include <asm/cpcmd.h>
52#include <asm/lowcore.h>
53#include <asm/irq.h>
54#include <asm/page.h>
55#include <asm/ptrace.h>
56#include <asm/sections.h>
57#include <asm/ebcdic.h>
58#include <asm/compat.h>
59#include <asm/kvm_virtio.h>
60
61long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
62 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
63long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
64 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
65 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
66
67/*
68 * User copy operations.
69 */
70struct uaccess_ops uaccess;
71EXPORT_SYMBOL(uaccess);
72
73/*
74 * Machine setup..
75 */
76unsigned int console_mode = 0;
77EXPORT_SYMBOL(console_mode);
78
79unsigned int console_devno = -1;
80EXPORT_SYMBOL(console_devno);
81
82unsigned int console_irq = -1;
83EXPORT_SYMBOL(console_irq);
84
85unsigned long elf_hwcap = 0;
86char elf_platform[ELF_PLATFORM_SIZE];
87
88struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
89
90int __initdata memory_end_set;
91unsigned long __initdata memory_end;
92
93/* An array with a pointer to the lowcore of every CPU. */
94struct _lowcore *lowcore_ptr[NR_CPUS];
95EXPORT_SYMBOL(lowcore_ptr);
96
97/*
98 * This is set up by the setup-routine at boot-time
99 * for S390 need to find out, what we have to setup
100 * using address 0x10400 ...
101 */
102
103#include <asm/setup.h>
104
105/*
106 * condev= and conmode= setup parameter.
107 */
108
109static int __init condev_setup(char *str)
110{
111 int vdev;
112
113 vdev = simple_strtoul(str, &str, 0);
114 if (vdev >= 0 && vdev < 65536) {
115 console_devno = vdev;
116 console_irq = -1;
117 }
118 return 1;
119}
120
121__setup("condev=", condev_setup);
122
123static void __init set_preferred_console(void)
124{
125 if (MACHINE_IS_KVM)
126 add_preferred_console("hvc", 0, NULL);
127 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
128 add_preferred_console("ttyS", 0, NULL);
129 else if (CONSOLE_IS_3270)
130 add_preferred_console("tty3270", 0, NULL);
131}
132
133static int __init conmode_setup(char *str)
134{
135#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
136 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
137 SET_CONSOLE_SCLP;
138#endif
139#if defined(CONFIG_TN3215_CONSOLE)
140 if (strncmp(str, "3215", 5) == 0)
141 SET_CONSOLE_3215;
142#endif
143#if defined(CONFIG_TN3270_CONSOLE)
144 if (strncmp(str, "3270", 5) == 0)
145 SET_CONSOLE_3270;
146#endif
147 set_preferred_console();
148 return 1;
149}
150
151__setup("conmode=", conmode_setup);
152
153static void __init conmode_default(void)
154{
155 char query_buffer[1024];
156 char *ptr;
157
158 if (MACHINE_IS_VM) {
159 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
160 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
161 ptr = strstr(query_buffer, "SUBCHANNEL =");
162 console_irq = simple_strtoul(ptr + 13, NULL, 16);
163 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
164 ptr = strstr(query_buffer, "CONMODE");
165 /*
166 * Set the conmode to 3215 so that the device recognition
167 * will set the cu_type of the console to 3215. If the
168 * conmode is 3270 and we don't set it back then both
169 * 3215 and the 3270 driver will try to access the console
170 * device (3215 as console and 3270 as normal tty).
171 */
172 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
173 if (ptr == NULL) {
174#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
175 SET_CONSOLE_SCLP;
176#endif
177 return;
178 }
179 if (strncmp(ptr + 8, "3270", 4) == 0) {
180#if defined(CONFIG_TN3270_CONSOLE)
181 SET_CONSOLE_3270;
182#elif defined(CONFIG_TN3215_CONSOLE)
183 SET_CONSOLE_3215;
184#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
185 SET_CONSOLE_SCLP;
186#endif
187 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
188#if defined(CONFIG_TN3215_CONSOLE)
189 SET_CONSOLE_3215;
190#elif defined(CONFIG_TN3270_CONSOLE)
191 SET_CONSOLE_3270;
192#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
193 SET_CONSOLE_SCLP;
194#endif
195 }
196 } else {
197#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198 SET_CONSOLE_SCLP;
199#endif
200 }
201}
202
203#ifdef CONFIG_ZFCPDUMP
204static void __init setup_zfcpdump(unsigned int console_devno)
205{
206 static char str[41];
207
208 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
209 return;
210 if (console_devno != -1)
211 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
212 ipl_info.data.fcp.dev_id.devno, console_devno);
213 else
214 sprintf(str, " cio_ignore=all,!0.0.%04x",
215 ipl_info.data.fcp.dev_id.devno);
216 strcat(boot_command_line, str);
217 console_loglevel = 2;
218}
219#else
220static inline void setup_zfcpdump(unsigned int console_devno) {}
221#endif /* CONFIG_ZFCPDUMP */
222
223 /*
224 * Reboot, halt and power_off stubs. They just call _machine_restart,
225 * _machine_halt or _machine_power_off.
226 */
227
228void machine_restart(char *command)
229{
230 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
231 /*
232 * Only unblank the console if we are called in enabled
233 * context or a bust_spinlocks cleared the way for us.
234 */
235 console_unblank();
236 _machine_restart(command);
237}
238
239void machine_halt(void)
240{
241 if (!in_interrupt() || oops_in_progress)
242 /*
243 * Only unblank the console if we are called in enabled
244 * context or a bust_spinlocks cleared the way for us.
245 */
246 console_unblank();
247 _machine_halt();
248}
249
250void machine_power_off(void)
251{
252 if (!in_interrupt() || oops_in_progress)
253 /*
254 * Only unblank the console if we are called in enabled
255 * context or a bust_spinlocks cleared the way for us.
256 */
257 console_unblank();
258 _machine_power_off();
259}
260
261/*
262 * Dummy power off function.
263 */
264void (*pm_power_off)(void) = machine_power_off;
265
266static int __init early_parse_mem(char *p)
267{
268 memory_end = memparse(p, &p);
269 memory_end_set = 1;
270 return 0;
271}
272early_param("mem", early_parse_mem);
273
274unsigned int user_mode = HOME_SPACE_MODE;
275EXPORT_SYMBOL_GPL(user_mode);
276
277static int set_amode_and_uaccess(unsigned long user_amode,
278 unsigned long user32_amode)
279{
280 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
281 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
282 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
283#ifdef CONFIG_COMPAT
284 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
285 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
286 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
287 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
288 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
289 PSW32_MASK_PSTATE;
290#endif
291 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
292 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
293
294 if (MACHINE_HAS_MVCOS) {
295 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
296 return 1;
297 } else {
298 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
299 return 0;
300 }
301}
302
303/*
304 * Switch kernel/user addressing modes?
305 */
306static int __init early_parse_switch_amode(char *p)
307{
308 user_mode = PRIMARY_SPACE_MODE;
309 return 0;
310}
311early_param("switch_amode", early_parse_switch_amode);
312
313static int __init early_parse_user_mode(char *p)
314{
315 if (p && strcmp(p, "primary") == 0)
316 user_mode = PRIMARY_SPACE_MODE;
317 else if (!p || strcmp(p, "home") == 0)
318 user_mode = HOME_SPACE_MODE;
319 else
320 return 1;
321 return 0;
322}
323early_param("user_mode", early_parse_user_mode);
324
325static void setup_addressing_mode(void)
326{
327 if (user_mode == PRIMARY_SPACE_MODE) {
328 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
329 pr_info("Address spaces switched, "
330 "mvcos available\n");
331 else
332 pr_info("Address spaces switched, "
333 "mvcos not available\n");
334 }
335}
336
337static void __init
338setup_lowcore(void)
339{
340 struct _lowcore *lc;
341
342 /*
343 * Setup lowcore for boot cpu
344 */
345 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
346 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
347 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
348 lc->restart_psw.addr =
349 PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
350 if (user_mode != HOME_SPACE_MODE)
351 lc->restart_psw.mask |= PSW_ASC_HOME;
352 lc->external_new_psw.mask = psw_kernel_bits;
353 lc->external_new_psw.addr =
354 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
355 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
356 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
357 lc->program_new_psw.mask = psw_kernel_bits;
358 lc->program_new_psw.addr =
359 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
360 lc->mcck_new_psw.mask =
361 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
362 lc->mcck_new_psw.addr =
363 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
364 lc->io_new_psw.mask = psw_kernel_bits;
365 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
366 lc->clock_comparator = -1ULL;
367 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
368 lc->async_stack = (unsigned long)
369 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
370 lc->panic_stack = (unsigned long)
371 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
372 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
373 lc->thread_info = (unsigned long) &init_thread_union;
374 lc->machine_flags = S390_lowcore.machine_flags;
375 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
376 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
377 MAX_FACILITY_BIT/8);
378#ifndef CONFIG_64BIT
379 if (MACHINE_HAS_IEEE) {
380 lc->extended_save_area_addr = (__u32)
381 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
382 /* enable extended save area */
383 __ctl_set_bit(14, 29);
384 }
385#else
386 lc->cmf_hpp = -1ULL;
387 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
388#endif
389 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
390 lc->async_enter_timer = S390_lowcore.async_enter_timer;
391 lc->exit_timer = S390_lowcore.exit_timer;
392 lc->user_timer = S390_lowcore.user_timer;
393 lc->system_timer = S390_lowcore.system_timer;
394 lc->steal_timer = S390_lowcore.steal_timer;
395 lc->last_update_timer = S390_lowcore.last_update_timer;
396 lc->last_update_clock = S390_lowcore.last_update_clock;
397 lc->ftrace_func = S390_lowcore.ftrace_func;
398 set_prefix((u32)(unsigned long) lc);
399 lowcore_ptr[0] = lc;
400}
401
402static struct resource code_resource = {
403 .name = "Kernel code",
404 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
405};
406
407static struct resource data_resource = {
408 .name = "Kernel data",
409 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
410};
411
412static struct resource bss_resource = {
413 .name = "Kernel bss",
414 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
415};
416
417static struct resource __initdata *standard_resources[] = {
418 &code_resource,
419 &data_resource,
420 &bss_resource,
421};
422
423static void __init setup_resources(void)
424{
425 struct resource *res, *std_res, *sub_res;
426 int i, j;
427
428 code_resource.start = (unsigned long) &_text;
429 code_resource.end = (unsigned long) &_etext - 1;
430 data_resource.start = (unsigned long) &_etext;
431 data_resource.end = (unsigned long) &_edata - 1;
432 bss_resource.start = (unsigned long) &__bss_start;
433 bss_resource.end = (unsigned long) &__bss_stop - 1;
434
435 for (i = 0; i < MEMORY_CHUNKS; i++) {
436 if (!memory_chunk[i].size)
437 continue;
438 res = alloc_bootmem_low(sizeof(*res));
439 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
440 switch (memory_chunk[i].type) {
441 case CHUNK_READ_WRITE:
442 res->name = "System RAM";
443 break;
444 case CHUNK_READ_ONLY:
445 res->name = "System ROM";
446 res->flags |= IORESOURCE_READONLY;
447 break;
448 default:
449 res->name = "reserved";
450 }
451 res->start = memory_chunk[i].addr;
452 res->end = res->start + memory_chunk[i].size - 1;
453 request_resource(&iomem_resource, res);
454
455 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
456 std_res = standard_resources[j];
457 if (std_res->start < res->start ||
458 std_res->start > res->end)
459 continue;
460 if (std_res->end > res->end) {
461 sub_res = alloc_bootmem_low(sizeof(*sub_res));
462 *sub_res = *std_res;
463 sub_res->end = res->end;
464 std_res->start = res->end + 1;
465 request_resource(res, sub_res);
466 } else {
467 request_resource(res, std_res);
468 }
469 }
470 }
471}
472
473unsigned long real_memory_size;
474EXPORT_SYMBOL_GPL(real_memory_size);
475
476static void __init setup_memory_end(void)
477{
478 unsigned long memory_size;
479 unsigned long max_mem;
480 int i;
481
482#ifdef CONFIG_ZFCPDUMP
483 if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
484 memory_end = ZFCPDUMP_HSA_SIZE;
485 memory_end_set = 1;
486 }
487#endif
488 memory_size = 0;
489 memory_end &= PAGE_MASK;
490
491 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
492 memory_end = min(max_mem, memory_end);
493
494 /*
495 * Make sure all chunks are MAX_ORDER aligned so we don't need the
496 * extra checks that HOLES_IN_ZONE would require.
497 */
498 for (i = 0; i < MEMORY_CHUNKS; i++) {
499 unsigned long start, end;
500 struct mem_chunk *chunk;
501 unsigned long align;
502
503 chunk = &memory_chunk[i];
504 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
505 start = (chunk->addr + align - 1) & ~(align - 1);
506 end = (chunk->addr + chunk->size) & ~(align - 1);
507 if (start >= end)
508 memset(chunk, 0, sizeof(*chunk));
509 else {
510 chunk->addr = start;
511 chunk->size = end - start;
512 }
513 }
514
515 for (i = 0; i < MEMORY_CHUNKS; i++) {
516 struct mem_chunk *chunk = &memory_chunk[i];
517
518 real_memory_size = max(real_memory_size,
519 chunk->addr + chunk->size);
520 if (chunk->addr >= max_mem) {
521 memset(chunk, 0, sizeof(*chunk));
522 continue;
523 }
524 if (chunk->addr + chunk->size > max_mem)
525 chunk->size = max_mem - chunk->addr;
526 memory_size = max(memory_size, chunk->addr + chunk->size);
527 }
528 if (!memory_end)
529 memory_end = memory_size;
530}
531
532void *restart_stack __attribute__((__section__(".data")));
533
534/*
535 * Setup new PSW and allocate stack for PSW restart interrupt
536 */
537static void __init setup_restart_psw(void)
538{
539 psw_t psw;
540
541 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
542 restart_stack += ASYNC_SIZE;
543
544 /*
545 * Setup restart PSW for absolute zero lowcore. This is necesary
546 * if PSW restart is done on an offline CPU that has lowcore zero
547 */
548 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
549 psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
550 copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
551}
552
553static void __init
554setup_memory(void)
555{
556 unsigned long bootmap_size;
557 unsigned long start_pfn, end_pfn;
558 int i;
559
560 /*
561 * partially used pages are not usable - thus
562 * we are rounding upwards:
563 */
564 start_pfn = PFN_UP(__pa(&_end));
565 end_pfn = max_pfn = PFN_DOWN(memory_end);
566
567#ifdef CONFIG_BLK_DEV_INITRD
568 /*
569 * Move the initrd in case the bitmap of the bootmem allocater
570 * would overwrite it.
571 */
572
573 if (INITRD_START && INITRD_SIZE) {
574 unsigned long bmap_size;
575 unsigned long start;
576
577 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
578 bmap_size = PFN_PHYS(bmap_size);
579
580 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
581 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
582
583 if (start + INITRD_SIZE > memory_end) {
584 pr_err("initrd extends beyond end of "
585 "memory (0x%08lx > 0x%08lx) "
586 "disabling initrd\n",
587 start + INITRD_SIZE, memory_end);
588 INITRD_START = INITRD_SIZE = 0;
589 } else {
590 pr_info("Moving initrd (0x%08lx -> "
591 "0x%08lx, size: %ld)\n",
592 INITRD_START, start, INITRD_SIZE);
593 memmove((void *) start, (void *) INITRD_START,
594 INITRD_SIZE);
595 INITRD_START = start;
596 }
597 }
598 }
599#endif
600
601 /*
602 * Initialize the boot-time allocator
603 */
604 bootmap_size = init_bootmem(start_pfn, end_pfn);
605
606 /*
607 * Register RAM areas with the bootmem allocator.
608 */
609
610 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
611 unsigned long start_chunk, end_chunk, pfn;
612
613 if (memory_chunk[i].type != CHUNK_READ_WRITE)
614 continue;
615 start_chunk = PFN_DOWN(memory_chunk[i].addr);
616 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
617 end_chunk = min(end_chunk, end_pfn);
618 if (start_chunk >= end_chunk)
619 continue;
620 add_active_range(0, start_chunk, end_chunk);
621 pfn = max(start_chunk, start_pfn);
622 for (; pfn < end_chunk; pfn++)
623 page_set_storage_key(PFN_PHYS(pfn),
624 PAGE_DEFAULT_KEY, 0);
625 }
626
627 psw_set_key(PAGE_DEFAULT_KEY);
628
629 free_bootmem_with_active_regions(0, max_pfn);
630
631 /*
632 * Reserve memory used for lowcore/command line/kernel image.
633 */
634 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
635 reserve_bootmem((unsigned long)_stext,
636 PFN_PHYS(start_pfn) - (unsigned long)_stext,
637 BOOTMEM_DEFAULT);
638 /*
639 * Reserve the bootmem bitmap itself as well. We do this in two
640 * steps (first step was init_bootmem()) because this catches
641 * the (very unlikely) case of us accidentally initializing the
642 * bootmem allocator with an invalid RAM area.
643 */
644 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
645 BOOTMEM_DEFAULT);
646
647#ifdef CONFIG_BLK_DEV_INITRD
648 if (INITRD_START && INITRD_SIZE) {
649 if (INITRD_START + INITRD_SIZE <= memory_end) {
650 reserve_bootmem(INITRD_START, INITRD_SIZE,
651 BOOTMEM_DEFAULT);
652 initrd_start = INITRD_START;
653 initrd_end = initrd_start + INITRD_SIZE;
654 } else {
655 pr_err("initrd extends beyond end of "
656 "memory (0x%08lx > 0x%08lx) "
657 "disabling initrd\n",
658 initrd_start + INITRD_SIZE, memory_end);
659 initrd_start = initrd_end = 0;
660 }
661 }
662#endif
663}
664
665/*
666 * Setup hardware capabilities.
667 */
668static void __init setup_hwcaps(void)
669{
670 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
671 struct cpuid cpu_id;
672 int i;
673
674 /*
675 * The store facility list bits numbers as found in the principles
676 * of operation are numbered with bit 1UL<<31 as number 0 to
677 * bit 1UL<<0 as number 31.
678 * Bit 0: instructions named N3, "backported" to esa-mode
679 * Bit 2: z/Architecture mode is active
680 * Bit 7: the store-facility-list-extended facility is installed
681 * Bit 17: the message-security assist is installed
682 * Bit 19: the long-displacement facility is installed
683 * Bit 21: the extended-immediate facility is installed
684 * Bit 22: extended-translation facility 3 is installed
685 * Bit 30: extended-translation facility 3 enhancement facility
686 * These get translated to:
687 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
688 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
689 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
690 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
691 */
692 for (i = 0; i < 6; i++)
693 if (test_facility(stfl_bits[i]))
694 elf_hwcap |= 1UL << i;
695
696 if (test_facility(22) && test_facility(30))
697 elf_hwcap |= HWCAP_S390_ETF3EH;
698
699 /*
700 * Check for additional facilities with store-facility-list-extended.
701 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
702 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
703 * as stored by stfl, bits 32-xxx contain additional facilities.
704 * How many facility words are stored depends on the number of
705 * doublewords passed to the instruction. The additional facilities
706 * are:
707 * Bit 42: decimal floating point facility is installed
708 * Bit 44: perform floating point operation facility is installed
709 * translated to:
710 * HWCAP_S390_DFP bit 6 (42 && 44).
711 */
712 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
713 elf_hwcap |= HWCAP_S390_DFP;
714
715 /*
716 * Huge page support HWCAP_S390_HPAGE is bit 7.
717 */
718 if (MACHINE_HAS_HPAGE)
719 elf_hwcap |= HWCAP_S390_HPAGE;
720
721 /*
722 * 64-bit register support for 31-bit processes
723 * HWCAP_S390_HIGH_GPRS is bit 9.
724 */
725 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
726
727 get_cpu_id(&cpu_id);
728 switch (cpu_id.machine) {
729 case 0x9672:
730#if !defined(CONFIG_64BIT)
731 default: /* Use "g5" as default for 31 bit kernels. */
732#endif
733 strcpy(elf_platform, "g5");
734 break;
735 case 0x2064:
736 case 0x2066:
737#if defined(CONFIG_64BIT)
738 default: /* Use "z900" as default for 64 bit kernels. */
739#endif
740 strcpy(elf_platform, "z900");
741 break;
742 case 0x2084:
743 case 0x2086:
744 strcpy(elf_platform, "z990");
745 break;
746 case 0x2094:
747 case 0x2096:
748 strcpy(elf_platform, "z9-109");
749 break;
750 case 0x2097:
751 case 0x2098:
752 strcpy(elf_platform, "z10");
753 break;
754 case 0x2817:
755 case 0x2818:
756 strcpy(elf_platform, "z196");
757 break;
758 }
759}
760
761/*
762 * Setup function called from init/main.c just after the banner
763 * was printed.
764 */
765
766void __init
767setup_arch(char **cmdline_p)
768{
769 /*
770 * print what head.S has found out about the machine
771 */
772#ifndef CONFIG_64BIT
773 if (MACHINE_IS_VM)
774 pr_info("Linux is running as a z/VM "
775 "guest operating system in 31-bit mode\n");
776 else if (MACHINE_IS_LPAR)
777 pr_info("Linux is running natively in 31-bit mode\n");
778 if (MACHINE_HAS_IEEE)
779 pr_info("The hardware system has IEEE compatible "
780 "floating point units\n");
781 else
782 pr_info("The hardware system has no IEEE compatible "
783 "floating point units\n");
784#else /* CONFIG_64BIT */
785 if (MACHINE_IS_VM)
786 pr_info("Linux is running as a z/VM "
787 "guest operating system in 64-bit mode\n");
788 else if (MACHINE_IS_KVM)
789 pr_info("Linux is running under KVM in 64-bit mode\n");
790 else if (MACHINE_IS_LPAR)
791 pr_info("Linux is running natively in 64-bit mode\n");
792#endif /* CONFIG_64BIT */
793
794 /* Have one command line that is parsed and saved in /proc/cmdline */
795 /* boot_command_line has been already set up in early.c */
796 *cmdline_p = boot_command_line;
797
798 ROOT_DEV = Root_RAM0;
799
800 init_mm.start_code = PAGE_OFFSET;
801 init_mm.end_code = (unsigned long) &_etext;
802 init_mm.end_data = (unsigned long) &_edata;
803 init_mm.brk = (unsigned long) &_end;
804
805 if (MACHINE_HAS_MVCOS)
806 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
807 else
808 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
809
810 parse_early_param();
811
812 setup_ipl();
813 setup_memory_end();
814 setup_addressing_mode();
815 setup_memory();
816 setup_resources();
817 setup_restart_psw();
818 setup_lowcore();
819
820 cpu_init();
821 s390_init_cpu_topology();
822
823 /*
824 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
825 */
826 setup_hwcaps();
827
828 /*
829 * Create kernel page tables and switch to virtual addressing.
830 */
831 paging_init();
832
833 /* Setup default console */
834 conmode_default();
835 set_preferred_console();
836
837 /* Setup zfcpdump support */
838 setup_zfcpdump(console_devno);
839}