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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/mem_detect.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 */
100unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
101unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
102unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
103unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_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
148int __bootdata(noexec_disabled);
149unsigned long __bootdata(ident_map_size);
150struct mem_detect_info __bootdata(mem_detect);
151struct initrd_data __bootdata(initrd_data);
152
153unsigned long __bootdata_preserved(__kaslr_offset);
154unsigned long __bootdata(__amode31_base);
155unsigned int __bootdata_preserved(zlib_dfltcc_support);
156EXPORT_SYMBOL(zlib_dfltcc_support);
157u64 __bootdata_preserved(stfle_fac_list[16]);
158EXPORT_SYMBOL(stfle_fac_list);
159u64 __bootdata_preserved(alt_stfle_fac_list[16]);
160struct oldmem_data __bootdata_preserved(oldmem_data);
161
162unsigned long VMALLOC_START;
163EXPORT_SYMBOL(VMALLOC_START);
164
165unsigned long VMALLOC_END;
166EXPORT_SYMBOL(VMALLOC_END);
167
168struct page *vmemmap;
169EXPORT_SYMBOL(vmemmap);
170unsigned long vmemmap_size;
171
172unsigned long MODULES_VADDR;
173unsigned long MODULES_END;
174
175/* An array with a pointer to the lowcore of every CPU. */
176struct lowcore *lowcore_ptr[NR_CPUS];
177EXPORT_SYMBOL(lowcore_ptr);
178
179DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
180
181/*
182 * The Write Back bit position in the physaddr is given by the SLPC PCI.
183 * Leaving the mask zero always uses write through which is safe
184 */
185unsigned long mio_wb_bit_mask __ro_after_init;
186
187/*
188 * This is set up by the setup-routine at boot-time
189 * for S390 need to find out, what we have to setup
190 * using address 0x10400 ...
191 */
192
193#include <asm/setup.h>
194
195/*
196 * condev= and conmode= setup parameter.
197 */
198
199static int __init condev_setup(char *str)
200{
201 int vdev;
202
203 vdev = simple_strtoul(str, &str, 0);
204 if (vdev >= 0 && vdev < 65536) {
205 console_devno = vdev;
206 console_irq = -1;
207 }
208 return 1;
209}
210
211__setup("condev=", condev_setup);
212
213static void __init set_preferred_console(void)
214{
215 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
216 add_preferred_console("ttyS", 0, NULL);
217 else if (CONSOLE_IS_3270)
218 add_preferred_console("tty3270", 0, NULL);
219 else if (CONSOLE_IS_VT220)
220 add_preferred_console("ttysclp", 0, NULL);
221 else if (CONSOLE_IS_HVC)
222 add_preferred_console("hvc", 0, NULL);
223}
224
225static int __init conmode_setup(char *str)
226{
227#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
229 SET_CONSOLE_SCLP;
230#endif
231#if defined(CONFIG_TN3215_CONSOLE)
232 if (!strcmp(str, "3215"))
233 SET_CONSOLE_3215;
234#endif
235#if defined(CONFIG_TN3270_CONSOLE)
236 if (!strcmp(str, "3270"))
237 SET_CONSOLE_3270;
238#endif
239 set_preferred_console();
240 return 1;
241}
242
243__setup("conmode=", conmode_setup);
244
245static void __init conmode_default(void)
246{
247 char query_buffer[1024];
248 char *ptr;
249
250 if (MACHINE_IS_VM) {
251 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
252 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
253 ptr = strstr(query_buffer, "SUBCHANNEL =");
254 console_irq = simple_strtoul(ptr + 13, NULL, 16);
255 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
256 ptr = strstr(query_buffer, "CONMODE");
257 /*
258 * Set the conmode to 3215 so that the device recognition
259 * will set the cu_type of the console to 3215. If the
260 * conmode is 3270 and we don't set it back then both
261 * 3215 and the 3270 driver will try to access the console
262 * device (3215 as console and 3270 as normal tty).
263 */
264 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
265 if (ptr == NULL) {
266#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
267 SET_CONSOLE_SCLP;
268#endif
269 return;
270 }
271 if (str_has_prefix(ptr + 8, "3270")) {
272#if defined(CONFIG_TN3270_CONSOLE)
273 SET_CONSOLE_3270;
274#elif defined(CONFIG_TN3215_CONSOLE)
275 SET_CONSOLE_3215;
276#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
277 SET_CONSOLE_SCLP;
278#endif
279 } else if (str_has_prefix(ptr + 8, "3215")) {
280#if defined(CONFIG_TN3215_CONSOLE)
281 SET_CONSOLE_3215;
282#elif defined(CONFIG_TN3270_CONSOLE)
283 SET_CONSOLE_3270;
284#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
285 SET_CONSOLE_SCLP;
286#endif
287 }
288 } else if (MACHINE_IS_KVM) {
289 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
290 SET_CONSOLE_VT220;
291 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
292 SET_CONSOLE_SCLP;
293 else
294 SET_CONSOLE_HVC;
295 } else {
296#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
297 SET_CONSOLE_SCLP;
298#endif
299 }
300}
301
302#ifdef CONFIG_CRASH_DUMP
303static void __init setup_zfcpdump(void)
304{
305 if (!is_ipl_type_dump())
306 return;
307 if (oldmem_data.start)
308 return;
309 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
310 console_loglevel = 2;
311}
312#else
313static inline void setup_zfcpdump(void) {}
314#endif /* CONFIG_CRASH_DUMP */
315
316 /*
317 * Reboot, halt and power_off stubs. They just call _machine_restart,
318 * _machine_halt or _machine_power_off.
319 */
320
321void machine_restart(char *command)
322{
323 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
324 /*
325 * Only unblank the console if we are called in enabled
326 * context or a bust_spinlocks cleared the way for us.
327 */
328 console_unblank();
329 _machine_restart(command);
330}
331
332void machine_halt(void)
333{
334 if (!in_interrupt() || oops_in_progress)
335 /*
336 * Only unblank the console if we are called in enabled
337 * context or a bust_spinlocks cleared the way for us.
338 */
339 console_unblank();
340 _machine_halt();
341}
342
343void machine_power_off(void)
344{
345 if (!in_interrupt() || oops_in_progress)
346 /*
347 * Only unblank the console if we are called in enabled
348 * context or a bust_spinlocks cleared the way for us.
349 */
350 console_unblank();
351 _machine_power_off();
352}
353
354/*
355 * Dummy power off function.
356 */
357void (*pm_power_off)(void) = machine_power_off;
358EXPORT_SYMBOL_GPL(pm_power_off);
359
360void *restart_stack;
361
362unsigned long stack_alloc(void)
363{
364#ifdef CONFIG_VMAP_STACK
365 void *ret;
366
367 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
368 NUMA_NO_NODE, __builtin_return_address(0));
369 kmemleak_not_leak(ret);
370 return (unsigned long)ret;
371#else
372 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
373#endif
374}
375
376void stack_free(unsigned long stack)
377{
378#ifdef CONFIG_VMAP_STACK
379 vfree((void *) stack);
380#else
381 free_pages(stack, THREAD_SIZE_ORDER);
382#endif
383}
384
385int __init arch_early_irq_init(void)
386{
387 unsigned long stack;
388
389 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
390 if (!stack)
391 panic("Couldn't allocate async stack");
392 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
393 return 0;
394}
395
396void __init arch_call_rest_init(void)
397{
398 unsigned long stack;
399
400 smp_reinit_ipl_cpu();
401 stack = stack_alloc();
402 if (!stack)
403 panic("Couldn't allocate kernel stack");
404 current->stack = (void *) stack;
405#ifdef CONFIG_VMAP_STACK
406 current->stack_vm_area = (void *) stack;
407#endif
408 set_task_stack_end_magic(current);
409 stack += STACK_INIT_OFFSET;
410 S390_lowcore.kernel_stack = stack;
411 call_on_stack_noreturn(rest_init, stack);
412}
413
414static void __init setup_lowcore_dat_off(void)
415{
416 unsigned long int_psw_mask = PSW_KERNEL_BITS;
417 struct lowcore *abs_lc, *lc;
418 unsigned long mcck_stack;
419 unsigned long flags;
420
421 if (IS_ENABLED(CONFIG_KASAN))
422 int_psw_mask |= PSW_MASK_DAT;
423
424 /*
425 * Setup lowcore for boot cpu
426 */
427 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
428 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
429 if (!lc)
430 panic("%s: Failed to allocate %zu bytes align=%zx\n",
431 __func__, sizeof(*lc), sizeof(*lc));
432
433 lc->restart_psw.mask = PSW_KERNEL_BITS;
434 lc->restart_psw.addr = (unsigned long) restart_int_handler;
435 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
436 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
437 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
438 lc->svc_new_psw.addr = (unsigned long) system_call;
439 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
440 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
441 lc->mcck_new_psw.mask = int_psw_mask;
442 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
443 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
444 lc->io_new_psw.addr = (unsigned long) io_int_handler;
445 lc->clock_comparator = clock_comparator_max;
446 lc->nodat_stack = ((unsigned long) &init_thread_union)
447 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
448 lc->current_task = (unsigned long)&init_task;
449 lc->lpp = LPP_MAGIC;
450 lc->machine_flags = S390_lowcore.machine_flags;
451 lc->preempt_count = S390_lowcore.preempt_count;
452 nmi_alloc_mcesa_early(&lc->mcesad);
453 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
454 lc->exit_timer = S390_lowcore.exit_timer;
455 lc->user_timer = S390_lowcore.user_timer;
456 lc->system_timer = S390_lowcore.system_timer;
457 lc->steal_timer = S390_lowcore.steal_timer;
458 lc->last_update_timer = S390_lowcore.last_update_timer;
459 lc->last_update_clock = S390_lowcore.last_update_clock;
460
461 /*
462 * Allocate the global restart stack which is the same for
463 * all CPUs in cast *one* of them does a PSW restart.
464 */
465 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
466 if (!restart_stack)
467 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
468 __func__, THREAD_SIZE, THREAD_SIZE);
469 restart_stack += STACK_INIT_OFFSET;
470
471 /*
472 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
473 * restart data to the absolute zero lowcore. This is necessary if
474 * PSW restart is done on an offline CPU that has lowcore zero.
475 */
476 lc->restart_stack = (unsigned long) restart_stack;
477 lc->restart_fn = (unsigned long) do_restart;
478 lc->restart_data = 0;
479 lc->restart_source = -1U;
480
481 abs_lc = get_abs_lowcore(&flags);
482 abs_lc->restart_stack = lc->restart_stack;
483 abs_lc->restart_fn = lc->restart_fn;
484 abs_lc->restart_data = lc->restart_data;
485 abs_lc->restart_source = lc->restart_source;
486 abs_lc->restart_psw = lc->restart_psw;
487 abs_lc->mcesad = lc->mcesad;
488 put_abs_lowcore(abs_lc, flags);
489
490 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
491 if (!mcck_stack)
492 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
493 __func__, THREAD_SIZE, THREAD_SIZE);
494 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
495
496 lc->spinlock_lockval = arch_spin_lockval(0);
497 lc->spinlock_index = 0;
498 arch_spin_lock_setup(0);
499 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
500 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
501 lc->preempt_count = PREEMPT_DISABLED;
502
503 set_prefix(__pa(lc));
504 lowcore_ptr[0] = lc;
505}
506
507static void __init setup_lowcore_dat_on(void)
508{
509 struct lowcore *abs_lc;
510 unsigned long flags;
511 int i;
512
513 __ctl_clear_bit(0, 28);
514 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
515 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
516 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
517 S390_lowcore.mcck_new_psw.mask |= PSW_MASK_DAT;
518 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
519 __ctl_set_bit(0, 28);
520 __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
521 if (abs_lowcore_map(0, lowcore_ptr[0], true))
522 panic("Couldn't setup absolute lowcore");
523 abs_lowcore_mapped = true;
524 abs_lc = get_abs_lowcore(&flags);
525 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
526 abs_lc->program_new_psw = S390_lowcore.program_new_psw;
527 for (i = 0; i < 16; i++)
528 abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i];
529 put_abs_lowcore(abs_lc, flags);
530}
531
532static struct resource code_resource = {
533 .name = "Kernel code",
534 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
535};
536
537static struct resource data_resource = {
538 .name = "Kernel data",
539 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
540};
541
542static struct resource bss_resource = {
543 .name = "Kernel bss",
544 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
545};
546
547static struct resource __initdata *standard_resources[] = {
548 &code_resource,
549 &data_resource,
550 &bss_resource,
551};
552
553static void __init setup_resources(void)
554{
555 struct resource *res, *std_res, *sub_res;
556 phys_addr_t start, end;
557 int j;
558 u64 i;
559
560 code_resource.start = (unsigned long) _text;
561 code_resource.end = (unsigned long) _etext - 1;
562 data_resource.start = (unsigned long) _etext;
563 data_resource.end = (unsigned long) _edata - 1;
564 bss_resource.start = (unsigned long) __bss_start;
565 bss_resource.end = (unsigned long) __bss_stop - 1;
566
567 for_each_mem_range(i, &start, &end) {
568 res = memblock_alloc(sizeof(*res), 8);
569 if (!res)
570 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
571 __func__, sizeof(*res), 8);
572 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
573
574 res->name = "System RAM";
575 res->start = start;
576 /*
577 * In memblock, end points to the first byte after the
578 * range while in resourses, end points to the last byte in
579 * the range.
580 */
581 res->end = end - 1;
582 request_resource(&iomem_resource, res);
583
584 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
585 std_res = standard_resources[j];
586 if (std_res->start < res->start ||
587 std_res->start > res->end)
588 continue;
589 if (std_res->end > res->end) {
590 sub_res = memblock_alloc(sizeof(*sub_res), 8);
591 if (!sub_res)
592 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
593 __func__, sizeof(*sub_res), 8);
594 *sub_res = *std_res;
595 sub_res->end = res->end;
596 std_res->start = res->end + 1;
597 request_resource(res, sub_res);
598 } else {
599 request_resource(res, std_res);
600 }
601 }
602 }
603#ifdef CONFIG_CRASH_DUMP
604 /*
605 * Re-add removed crash kernel memory as reserved memory. This makes
606 * sure it will be mapped with the identity mapping and struct pages
607 * will be created, so it can be resized later on.
608 * However add it later since the crash kernel resource should not be
609 * part of the System RAM resource.
610 */
611 if (crashk_res.end) {
612 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
613 0, MEMBLOCK_NONE);
614 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
615 insert_resource(&iomem_resource, &crashk_res);
616 }
617#endif
618}
619
620static void __init setup_memory_end(void)
621{
622 memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size);
623 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
624 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
625}
626
627#ifdef CONFIG_CRASH_DUMP
628
629/*
630 * When kdump is enabled, we have to ensure that no memory from the area
631 * [0 - crashkernel memory size] is set offline - it will be exchanged with
632 * the crashkernel memory region when kdump is triggered. The crashkernel
633 * memory region can never get offlined (pages are unmovable).
634 */
635static int kdump_mem_notifier(struct notifier_block *nb,
636 unsigned long action, void *data)
637{
638 struct memory_notify *arg = data;
639
640 if (action != MEM_GOING_OFFLINE)
641 return NOTIFY_OK;
642 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
643 return NOTIFY_BAD;
644 return NOTIFY_OK;
645}
646
647static struct notifier_block kdump_mem_nb = {
648 .notifier_call = kdump_mem_notifier,
649};
650
651#endif
652
653/*
654 * Reserve memory for kdump kernel to be loaded with kexec
655 */
656static void __init reserve_crashkernel(void)
657{
658#ifdef CONFIG_CRASH_DUMP
659 unsigned long long crash_base, crash_size;
660 phys_addr_t low, high;
661 int rc;
662
663 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
664 &crash_base);
665
666 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
667 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
668 if (rc || crash_size == 0)
669 return;
670
671 if (memblock.memory.regions[0].size < crash_size) {
672 pr_info("crashkernel reservation failed: %s\n",
673 "first memory chunk must be at least crashkernel size");
674 return;
675 }
676
677 low = crash_base ?: oldmem_data.start;
678 high = low + crash_size;
679 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
680 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
681 crash_base = low;
682 } else {
683 /* Find suitable area in free memory */
684 low = max_t(unsigned long, crash_size, sclp.hsa_size);
685 high = crash_base ? crash_base + crash_size : ULONG_MAX;
686
687 if (crash_base && crash_base < low) {
688 pr_info("crashkernel reservation failed: %s\n",
689 "crash_base too low");
690 return;
691 }
692 low = crash_base ?: low;
693 crash_base = memblock_phys_alloc_range(crash_size,
694 KEXEC_CRASH_MEM_ALIGN,
695 low, high);
696 }
697
698 if (!crash_base) {
699 pr_info("crashkernel reservation failed: %s\n",
700 "no suitable area found");
701 return;
702 }
703
704 if (register_memory_notifier(&kdump_mem_nb)) {
705 memblock_phys_free(crash_base, crash_size);
706 return;
707 }
708
709 if (!oldmem_data.start && MACHINE_IS_VM)
710 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
711 crashk_res.start = crash_base;
712 crashk_res.end = crash_base + crash_size - 1;
713 memblock_remove(crash_base, crash_size);
714 pr_info("Reserving %lluMB of memory at %lluMB "
715 "for crashkernel (System RAM: %luMB)\n",
716 crash_size >> 20, crash_base >> 20,
717 (unsigned long)memblock.memory.total_size >> 20);
718 os_info_crashkernel_add(crash_base, crash_size);
719#endif
720}
721
722/*
723 * Reserve the initrd from being used by memblock
724 */
725static void __init reserve_initrd(void)
726{
727#ifdef CONFIG_BLK_DEV_INITRD
728 if (!initrd_data.start || !initrd_data.size)
729 return;
730 initrd_start = (unsigned long)__va(initrd_data.start);
731 initrd_end = initrd_start + initrd_data.size;
732 memblock_reserve(initrd_data.start, initrd_data.size);
733#endif
734}
735
736/*
737 * Reserve the memory area used to pass the certificate lists
738 */
739static void __init reserve_certificate_list(void)
740{
741 if (ipl_cert_list_addr)
742 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
743}
744
745static void __init reserve_mem_detect_info(void)
746{
747 unsigned long start, size;
748
749 get_mem_detect_reserved(&start, &size);
750 if (size)
751 memblock_reserve(start, size);
752}
753
754static void __init free_mem_detect_info(void)
755{
756 unsigned long start, size;
757
758 get_mem_detect_reserved(&start, &size);
759 if (size)
760 memblock_phys_free(start, size);
761}
762
763static const char * __init get_mem_info_source(void)
764{
765 switch (mem_detect.info_source) {
766 case MEM_DETECT_SCLP_STOR_INFO:
767 return "sclp storage info";
768 case MEM_DETECT_DIAG260:
769 return "diag260";
770 case MEM_DETECT_SCLP_READ_INFO:
771 return "sclp read info";
772 case MEM_DETECT_BIN_SEARCH:
773 return "binary search";
774 }
775 return "none";
776}
777
778static void __init memblock_add_mem_detect_info(void)
779{
780 unsigned long start, end;
781 int i;
782
783 pr_debug("physmem info source: %s (%hhd)\n",
784 get_mem_info_source(), mem_detect.info_source);
785 /* keep memblock lists close to the kernel */
786 memblock_set_bottom_up(true);
787 for_each_mem_detect_block(i, &start, &end) {
788 memblock_add(start, end - start);
789 memblock_physmem_add(start, end - start);
790 }
791 memblock_set_bottom_up(false);
792 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
793}
794
795/*
796 * Check for initrd being in usable memory
797 */
798static void __init check_initrd(void)
799{
800#ifdef CONFIG_BLK_DEV_INITRD
801 if (initrd_data.start && initrd_data.size &&
802 !memblock_is_region_memory(initrd_data.start, initrd_data.size)) {
803 pr_err("The initial RAM disk does not fit into the memory\n");
804 memblock_phys_free(initrd_data.start, initrd_data.size);
805 initrd_start = initrd_end = 0;
806 }
807#endif
808}
809
810/*
811 * Reserve memory used for lowcore/command line/kernel image.
812 */
813static void __init reserve_kernel(void)
814{
815 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
816 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
817 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
818 memblock_reserve(__amode31_base, __eamode31 - __samode31);
819 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
820 memblock_reserve(__pa(_stext), _end - _stext);
821}
822
823static void __init setup_memory(void)
824{
825 phys_addr_t start, end;
826 u64 i;
827
828 /*
829 * Init storage key for present memory
830 */
831 for_each_mem_range(i, &start, &end)
832 storage_key_init_range(start, end);
833
834 psw_set_key(PAGE_DEFAULT_KEY);
835}
836
837static void __init relocate_amode31_section(void)
838{
839 unsigned long amode31_size = __eamode31 - __samode31;
840 long amode31_offset = __amode31_base - __samode31;
841 long *ptr;
842
843 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
844
845 /* Move original AMODE31 section to the new one */
846 memmove((void *)__amode31_base, (void *)__samode31, amode31_size);
847 /* Zero out the old AMODE31 section to catch invalid accesses within it */
848 memset((void *)__samode31, 0, amode31_size);
849
850 /* Update all AMODE31 region references */
851 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
852 *ptr += amode31_offset;
853}
854
855/* This must be called after AMODE31 relocation */
856static void __init setup_cr(void)
857{
858 union ctlreg2 cr2;
859 union ctlreg5 cr5;
860 union ctlreg15 cr15;
861
862 __ctl_duct[1] = (unsigned long)__ctl_aste;
863 __ctl_duct[2] = (unsigned long)__ctl_aste;
864 __ctl_duct[4] = (unsigned long)__ctl_duald;
865
866 /* Update control registers CR2, CR5 and CR15 */
867 __ctl_store(cr2.val, 2, 2);
868 __ctl_store(cr5.val, 5, 5);
869 __ctl_store(cr15.val, 15, 15);
870 cr2.ducto = (unsigned long)__ctl_duct >> 6;
871 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
872 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
873 __ctl_load(cr2.val, 2, 2);
874 __ctl_load(cr5.val, 5, 5);
875 __ctl_load(cr15.val, 15, 15);
876}
877
878/*
879 * Add system information as device randomness
880 */
881static void __init setup_randomness(void)
882{
883 struct sysinfo_3_2_2 *vmms;
884
885 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
886 if (!vmms)
887 panic("Failed to allocate memory for sysinfo structure\n");
888 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
889 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
890 memblock_free(vmms, PAGE_SIZE);
891
892 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
893 static_branch_enable(&s390_arch_random_available);
894}
895
896/*
897 * Find the correct size for the task_struct. This depends on
898 * the size of the struct fpu at the end of the thread_struct
899 * which is embedded in the task_struct.
900 */
901static void __init setup_task_size(void)
902{
903 int task_size = sizeof(struct task_struct);
904
905 if (!MACHINE_HAS_VX) {
906 task_size -= sizeof(__vector128) * __NUM_VXRS;
907 task_size += sizeof(freg_t) * __NUM_FPRS;
908 }
909 arch_task_struct_size = task_size;
910}
911
912/*
913 * Issue diagnose 318 to set the control program name and
914 * version codes.
915 */
916static void __init setup_control_program_code(void)
917{
918 union diag318_info diag318_info = {
919 .cpnc = CPNC_LINUX,
920 .cpvc = 0,
921 };
922
923 if (!sclp.has_diag318)
924 return;
925
926 diag_stat_inc(DIAG_STAT_X318);
927 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
928}
929
930/*
931 * Print the component list from the IPL report
932 */
933static void __init log_component_list(void)
934{
935 struct ipl_rb_component_entry *ptr, *end;
936 char *str;
937
938 if (!early_ipl_comp_list_addr)
939 return;
940 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
941 pr_info("Linux is running with Secure-IPL enabled\n");
942 else
943 pr_info("Linux is running with Secure-IPL disabled\n");
944 ptr = (void *) early_ipl_comp_list_addr;
945 end = (void *) ptr + early_ipl_comp_list_size;
946 pr_info("The IPL report contains the following components:\n");
947 while (ptr < end) {
948 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
949 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
950 str = "signed, verified";
951 else
952 str = "signed, verification failed";
953 } else {
954 str = "not signed";
955 }
956 pr_info("%016llx - %016llx (%s)\n",
957 ptr->addr, ptr->addr + ptr->len, str);
958 ptr++;
959 }
960}
961
962/*
963 * Setup function called from init/main.c just after the banner
964 * was printed.
965 */
966
967void __init setup_arch(char **cmdline_p)
968{
969 /*
970 * print what head.S has found out about the machine
971 */
972 if (MACHINE_IS_VM)
973 pr_info("Linux is running as a z/VM "
974 "guest operating system in 64-bit mode\n");
975 else if (MACHINE_IS_KVM)
976 pr_info("Linux is running under KVM in 64-bit mode\n");
977 else if (MACHINE_IS_LPAR)
978 pr_info("Linux is running natively in 64-bit mode\n");
979 else
980 pr_info("Linux is running as a guest in 64-bit mode\n");
981
982 log_component_list();
983
984 /* Have one command line that is parsed and saved in /proc/cmdline */
985 /* boot_command_line has been already set up in early.c */
986 *cmdline_p = boot_command_line;
987
988 ROOT_DEV = Root_RAM0;
989
990 setup_initial_init_mm(_text, _etext, _edata, _end);
991
992 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
993 nospec_auto_detect();
994
995 jump_label_init();
996 parse_early_param();
997#ifdef CONFIG_CRASH_DUMP
998 /* Deactivate elfcorehdr= kernel parameter */
999 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1000#endif
1001
1002 os_info_init();
1003 setup_ipl();
1004 setup_task_size();
1005 setup_control_program_code();
1006
1007 /* Do some memory reservations *before* memory is added to memblock */
1008 reserve_kernel();
1009 reserve_initrd();
1010 reserve_certificate_list();
1011 reserve_mem_detect_info();
1012 memblock_set_current_limit(ident_map_size);
1013 memblock_allow_resize();
1014
1015 /* Get information about *all* installed memory */
1016 memblock_add_mem_detect_info();
1017
1018 free_mem_detect_info();
1019 setup_memory_end();
1020 memblock_dump_all();
1021 setup_memory();
1022
1023 relocate_amode31_section();
1024 setup_cr();
1025 setup_uv();
1026 dma_contiguous_reserve(ident_map_size);
1027 vmcp_cma_reserve();
1028 if (MACHINE_HAS_EDAT2)
1029 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1030
1031 check_initrd();
1032 reserve_crashkernel();
1033#ifdef CONFIG_CRASH_DUMP
1034 /*
1035 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
1036 * Therefore CPU and device initialization should be done afterwards.
1037 */
1038 smp_save_dump_secondary_cpus();
1039#endif
1040
1041 setup_resources();
1042 setup_lowcore_dat_off();
1043 smp_fill_possible_mask();
1044 cpu_detect_mhz_feature();
1045 cpu_init();
1046 numa_setup();
1047 smp_detect_cpus();
1048 topology_init_early();
1049
1050 if (test_facility(193))
1051 static_branch_enable(&cpu_has_bear);
1052
1053 /*
1054 * Create kernel page tables and switch to virtual addressing.
1055 */
1056 paging_init();
1057 memcpy_real_init();
1058 /*
1059 * After paging_init created the kernel page table, the new PSWs
1060 * in lowcore can now run with DAT enabled.
1061 */
1062 setup_lowcore_dat_on();
1063#ifdef CONFIG_CRASH_DUMP
1064 smp_save_dump_ipl_cpu();
1065#endif
1066
1067 /* Setup default console */
1068 conmode_default();
1069 set_preferred_console();
1070
1071 apply_alternative_instructions();
1072 if (IS_ENABLED(CONFIG_EXPOLINE))
1073 nospec_init_branches();
1074
1075 /* Setup zfcp/nvme dump support */
1076 setup_zfcpdump();
1077
1078 /* Add system specific data to the random pool */
1079 setup_randomness();
1080}
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
9 */
10
11/*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
15#define KMSG_COMPONENT "setup"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/errno.h>
19#include <linux/export.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/memblock.h>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/ptrace.h>
27#include <linux/random.h>
28#include <linux/user.h>
29#include <linux/tty.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/kernel_stat.h>
38#include <linux/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/kexec.h>
45#include <linux/crash_dump.h>
46#include <linux/memory.h>
47#include <linux/compat.h>
48
49#include <asm/ipl.h>
50#include <asm/facility.h>
51#include <asm/smp.h>
52#include <asm/mmu_context.h>
53#include <asm/cpcmd.h>
54#include <asm/lowcore.h>
55#include <asm/irq.h>
56#include <asm/page.h>
57#include <asm/ptrace.h>
58#include <asm/sections.h>
59#include <asm/ebcdic.h>
60#include <asm/kvm_virtio.h>
61#include <asm/diag.h>
62#include <asm/os_info.h>
63#include <asm/sclp.h>
64#include <asm/sysinfo.h>
65#include <asm/numa.h>
66#include "entry.h"
67
68/*
69 * Machine setup..
70 */
71unsigned int console_mode = 0;
72EXPORT_SYMBOL(console_mode);
73
74unsigned int console_devno = -1;
75EXPORT_SYMBOL(console_devno);
76
77unsigned int console_irq = -1;
78EXPORT_SYMBOL(console_irq);
79
80unsigned long elf_hwcap __read_mostly = 0;
81char elf_platform[ELF_PLATFORM_SIZE];
82
83unsigned long int_hwcap = 0;
84
85int __initdata memory_end_set;
86unsigned long __initdata memory_end;
87unsigned long __initdata max_physmem_end;
88
89unsigned long VMALLOC_START;
90EXPORT_SYMBOL(VMALLOC_START);
91
92unsigned long VMALLOC_END;
93EXPORT_SYMBOL(VMALLOC_END);
94
95struct page *vmemmap;
96EXPORT_SYMBOL(vmemmap);
97
98unsigned long MODULES_VADDR;
99unsigned long MODULES_END;
100
101/* An array with a pointer to the lowcore of every CPU. */
102struct lowcore *lowcore_ptr[NR_CPUS];
103EXPORT_SYMBOL(lowcore_ptr);
104
105/*
106 * This is set up by the setup-routine at boot-time
107 * for S390 need to find out, what we have to setup
108 * using address 0x10400 ...
109 */
110
111#include <asm/setup.h>
112
113/*
114 * condev= and conmode= setup parameter.
115 */
116
117static int __init condev_setup(char *str)
118{
119 int vdev;
120
121 vdev = simple_strtoul(str, &str, 0);
122 if (vdev >= 0 && vdev < 65536) {
123 console_devno = vdev;
124 console_irq = -1;
125 }
126 return 1;
127}
128
129__setup("condev=", condev_setup);
130
131static void __init set_preferred_console(void)
132{
133 if (MACHINE_IS_KVM) {
134 if (sclp.has_vt220)
135 add_preferred_console("ttyS", 1, NULL);
136 else if (sclp.has_linemode)
137 add_preferred_console("ttyS", 0, NULL);
138 else
139 add_preferred_console("hvc", 0, NULL);
140 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
141 add_preferred_console("ttyS", 0, NULL);
142 else if (CONSOLE_IS_3270)
143 add_preferred_console("tty3270", 0, NULL);
144}
145
146static int __init conmode_setup(char *str)
147{
148#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
149 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
150 SET_CONSOLE_SCLP;
151#endif
152#if defined(CONFIG_TN3215_CONSOLE)
153 if (strncmp(str, "3215", 5) == 0)
154 SET_CONSOLE_3215;
155#endif
156#if defined(CONFIG_TN3270_CONSOLE)
157 if (strncmp(str, "3270", 5) == 0)
158 SET_CONSOLE_3270;
159#endif
160 set_preferred_console();
161 return 1;
162}
163
164__setup("conmode=", conmode_setup);
165
166static void __init conmode_default(void)
167{
168 char query_buffer[1024];
169 char *ptr;
170
171 if (MACHINE_IS_VM) {
172 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
173 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
174 ptr = strstr(query_buffer, "SUBCHANNEL =");
175 console_irq = simple_strtoul(ptr + 13, NULL, 16);
176 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
177 ptr = strstr(query_buffer, "CONMODE");
178 /*
179 * Set the conmode to 3215 so that the device recognition
180 * will set the cu_type of the console to 3215. If the
181 * conmode is 3270 and we don't set it back then both
182 * 3215 and the 3270 driver will try to access the console
183 * device (3215 as console and 3270 as normal tty).
184 */
185 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
186 if (ptr == NULL) {
187#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
188 SET_CONSOLE_SCLP;
189#endif
190 return;
191 }
192 if (strncmp(ptr + 8, "3270", 4) == 0) {
193#if defined(CONFIG_TN3270_CONSOLE)
194 SET_CONSOLE_3270;
195#elif defined(CONFIG_TN3215_CONSOLE)
196 SET_CONSOLE_3215;
197#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198 SET_CONSOLE_SCLP;
199#endif
200 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
201#if defined(CONFIG_TN3215_CONSOLE)
202 SET_CONSOLE_3215;
203#elif defined(CONFIG_TN3270_CONSOLE)
204 SET_CONSOLE_3270;
205#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
206 SET_CONSOLE_SCLP;
207#endif
208 }
209 } else {
210#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
211 SET_CONSOLE_SCLP;
212#endif
213 }
214}
215
216#ifdef CONFIG_CRASH_DUMP
217static void __init setup_zfcpdump(void)
218{
219 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
220 return;
221 if (OLDMEM_BASE)
222 return;
223 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
224 console_loglevel = 2;
225}
226#else
227static inline void setup_zfcpdump(void) {}
228#endif /* CONFIG_CRASH_DUMP */
229
230 /*
231 * Reboot, halt and power_off stubs. They just call _machine_restart,
232 * _machine_halt or _machine_power_off.
233 */
234
235void machine_restart(char *command)
236{
237 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
238 /*
239 * Only unblank the console if we are called in enabled
240 * context or a bust_spinlocks cleared the way for us.
241 */
242 console_unblank();
243 _machine_restart(command);
244}
245
246void machine_halt(void)
247{
248 if (!in_interrupt() || 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_halt();
255}
256
257void machine_power_off(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_power_off();
266}
267
268/*
269 * Dummy power off function.
270 */
271void (*pm_power_off)(void) = machine_power_off;
272EXPORT_SYMBOL_GPL(pm_power_off);
273
274static int __init early_parse_mem(char *p)
275{
276 memory_end = memparse(p, &p);
277 memory_end &= PAGE_MASK;
278 memory_end_set = 1;
279 return 0;
280}
281early_param("mem", early_parse_mem);
282
283static int __init parse_vmalloc(char *arg)
284{
285 if (!arg)
286 return -EINVAL;
287 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
288 return 0;
289}
290early_param("vmalloc", parse_vmalloc);
291
292void *restart_stack __attribute__((__section__(".data")));
293
294static void __init setup_lowcore(void)
295{
296 struct lowcore *lc;
297
298 /*
299 * Setup lowcore for boot cpu
300 */
301 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
302 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
303 lc->restart_psw.mask = PSW_KERNEL_BITS;
304 lc->restart_psw.addr = (unsigned long) restart_int_handler;
305 lc->external_new_psw.mask = PSW_KERNEL_BITS |
306 PSW_MASK_DAT | PSW_MASK_MCHECK;
307 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
308 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
309 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
310 lc->svc_new_psw.addr = (unsigned long) system_call;
311 lc->program_new_psw.mask = PSW_KERNEL_BITS |
312 PSW_MASK_DAT | PSW_MASK_MCHECK;
313 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
314 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
315 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
316 lc->io_new_psw.mask = PSW_KERNEL_BITS |
317 PSW_MASK_DAT | PSW_MASK_MCHECK;
318 lc->io_new_psw.addr = (unsigned long) io_int_handler;
319 lc->clock_comparator = -1ULL;
320 lc->kernel_stack = ((unsigned long) &init_thread_union)
321 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
322 lc->async_stack = (unsigned long)
323 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
324 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
325 lc->panic_stack = (unsigned long)
326 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
327 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
328 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
329 lc->thread_info = (unsigned long) &init_thread_union;
330 lc->lpp = LPP_MAGIC;
331 lc->machine_flags = S390_lowcore.machine_flags;
332 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
333 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
334 MAX_FACILITY_BIT/8);
335 if (MACHINE_HAS_VX)
336 lc->vector_save_area_addr =
337 (unsigned long) &lc->vector_save_area;
338 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
339 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
340 lc->async_enter_timer = S390_lowcore.async_enter_timer;
341 lc->exit_timer = S390_lowcore.exit_timer;
342 lc->user_timer = S390_lowcore.user_timer;
343 lc->system_timer = S390_lowcore.system_timer;
344 lc->steal_timer = S390_lowcore.steal_timer;
345 lc->last_update_timer = S390_lowcore.last_update_timer;
346 lc->last_update_clock = S390_lowcore.last_update_clock;
347
348 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
349 restart_stack += ASYNC_SIZE;
350
351 /*
352 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
353 * restart data to the absolute zero lowcore. This is necessary if
354 * PSW restart is done on an offline CPU that has lowcore zero.
355 */
356 lc->restart_stack = (unsigned long) restart_stack;
357 lc->restart_fn = (unsigned long) do_restart;
358 lc->restart_data = 0;
359 lc->restart_source = -1UL;
360
361 /* Setup absolute zero lowcore */
362 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
363 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
364 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
365 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
366 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
367
368#ifdef CONFIG_SMP
369 lc->spinlock_lockval = arch_spin_lockval(0);
370#endif
371
372 set_prefix((u32)(unsigned long) lc);
373 lowcore_ptr[0] = lc;
374}
375
376static struct resource code_resource = {
377 .name = "Kernel code",
378 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
379};
380
381static struct resource data_resource = {
382 .name = "Kernel data",
383 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
384};
385
386static struct resource bss_resource = {
387 .name = "Kernel bss",
388 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
389};
390
391static struct resource __initdata *standard_resources[] = {
392 &code_resource,
393 &data_resource,
394 &bss_resource,
395};
396
397static void __init setup_resources(void)
398{
399 struct resource *res, *std_res, *sub_res;
400 struct memblock_region *reg;
401 int j;
402
403 code_resource.start = (unsigned long) &_text;
404 code_resource.end = (unsigned long) &_etext - 1;
405 data_resource.start = (unsigned long) &_etext;
406 data_resource.end = (unsigned long) &_edata - 1;
407 bss_resource.start = (unsigned long) &__bss_start;
408 bss_resource.end = (unsigned long) &__bss_stop - 1;
409
410 for_each_memblock(memory, reg) {
411 res = alloc_bootmem_low(sizeof(*res));
412 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
413
414 res->name = "System RAM";
415 res->start = reg->base;
416 res->end = reg->base + reg->size - 1;
417 request_resource(&iomem_resource, res);
418
419 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
420 std_res = standard_resources[j];
421 if (std_res->start < res->start ||
422 std_res->start > res->end)
423 continue;
424 if (std_res->end > res->end) {
425 sub_res = alloc_bootmem_low(sizeof(*sub_res));
426 *sub_res = *std_res;
427 sub_res->end = res->end;
428 std_res->start = res->end + 1;
429 request_resource(res, sub_res);
430 } else {
431 request_resource(res, std_res);
432 }
433 }
434 }
435}
436
437static void __init setup_memory_end(void)
438{
439 unsigned long vmax, vmalloc_size, tmp;
440
441 /* Choose kernel address space layout: 2, 3, or 4 levels. */
442 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
443 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
444 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
445 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
446 vmax = 1UL << 42; /* 3-level kernel page table */
447 else
448 vmax = 1UL << 53; /* 4-level kernel page table */
449 /* module area is at the end of the kernel address space. */
450 MODULES_END = vmax;
451 MODULES_VADDR = MODULES_END - MODULES_LEN;
452 VMALLOC_END = MODULES_VADDR;
453 VMALLOC_START = vmax - vmalloc_size;
454
455 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
456 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
457 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
458 tmp = SECTION_ALIGN_UP(tmp);
459 tmp = VMALLOC_START - tmp * sizeof(struct page);
460 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
461 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
462 vmemmap = (struct page *) tmp;
463
464 /* Take care that memory_end is set and <= vmemmap */
465 memory_end = min(memory_end ?: max_physmem_end, tmp);
466 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
467 memblock_remove(memory_end, ULONG_MAX);
468
469 pr_notice("Max memory size: %luMB\n", memory_end >> 20);
470}
471
472static void __init setup_vmcoreinfo(void)
473{
474 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
475}
476
477#ifdef CONFIG_CRASH_DUMP
478
479/*
480 * When kdump is enabled, we have to ensure that no memory from
481 * the area [0 - crashkernel memory size] and
482 * [crashk_res.start - crashk_res.end] is set offline.
483 */
484static int kdump_mem_notifier(struct notifier_block *nb,
485 unsigned long action, void *data)
486{
487 struct memory_notify *arg = data;
488
489 if (action != MEM_GOING_OFFLINE)
490 return NOTIFY_OK;
491 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
492 return NOTIFY_BAD;
493 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
494 return NOTIFY_OK;
495 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
496 return NOTIFY_OK;
497 return NOTIFY_BAD;
498}
499
500static struct notifier_block kdump_mem_nb = {
501 .notifier_call = kdump_mem_notifier,
502};
503
504#endif
505
506/*
507 * Make sure that the area behind memory_end is protected
508 */
509static void reserve_memory_end(void)
510{
511#ifdef CONFIG_CRASH_DUMP
512 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
513 !OLDMEM_BASE && sclp.hsa_size) {
514 memory_end = sclp.hsa_size;
515 memory_end &= PAGE_MASK;
516 memory_end_set = 1;
517 }
518#endif
519 if (!memory_end_set)
520 return;
521 memblock_reserve(memory_end, ULONG_MAX);
522}
523
524/*
525 * Make sure that oldmem, where the dump is stored, is protected
526 */
527static void reserve_oldmem(void)
528{
529#ifdef CONFIG_CRASH_DUMP
530 if (OLDMEM_BASE)
531 /* Forget all memory above the running kdump system */
532 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
533#endif
534}
535
536/*
537 * Make sure that oldmem, where the dump is stored, is protected
538 */
539static void remove_oldmem(void)
540{
541#ifdef CONFIG_CRASH_DUMP
542 if (OLDMEM_BASE)
543 /* Forget all memory above the running kdump system */
544 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
545#endif
546}
547
548/*
549 * Reserve memory for kdump kernel to be loaded with kexec
550 */
551static void __init reserve_crashkernel(void)
552{
553#ifdef CONFIG_CRASH_DUMP
554 unsigned long long crash_base, crash_size;
555 phys_addr_t low, high;
556 int rc;
557
558 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
559 &crash_base);
560
561 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
562 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
563 if (rc || crash_size == 0)
564 return;
565
566 if (memblock.memory.regions[0].size < crash_size) {
567 pr_info("crashkernel reservation failed: %s\n",
568 "first memory chunk must be at least crashkernel size");
569 return;
570 }
571
572 low = crash_base ?: OLDMEM_BASE;
573 high = low + crash_size;
574 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
575 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
576 crash_base = low;
577 } else {
578 /* Find suitable area in free memory */
579 low = max_t(unsigned long, crash_size, sclp.hsa_size);
580 high = crash_base ? crash_base + crash_size : ULONG_MAX;
581
582 if (crash_base && crash_base < low) {
583 pr_info("crashkernel reservation failed: %s\n",
584 "crash_base too low");
585 return;
586 }
587 low = crash_base ?: low;
588 crash_base = memblock_find_in_range(low, high, crash_size,
589 KEXEC_CRASH_MEM_ALIGN);
590 }
591
592 if (!crash_base) {
593 pr_info("crashkernel reservation failed: %s\n",
594 "no suitable area found");
595 return;
596 }
597
598 if (register_memory_notifier(&kdump_mem_nb))
599 return;
600
601 if (!OLDMEM_BASE && MACHINE_IS_VM)
602 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
603 crashk_res.start = crash_base;
604 crashk_res.end = crash_base + crash_size - 1;
605 insert_resource(&iomem_resource, &crashk_res);
606 memblock_remove(crash_base, crash_size);
607 pr_info("Reserving %lluMB of memory at %lluMB "
608 "for crashkernel (System RAM: %luMB)\n",
609 crash_size >> 20, crash_base >> 20,
610 (unsigned long)memblock.memory.total_size >> 20);
611 os_info_crashkernel_add(crash_base, crash_size);
612#endif
613}
614
615/*
616 * Reserve the initrd from being used by memblock
617 */
618static void __init reserve_initrd(void)
619{
620#ifdef CONFIG_BLK_DEV_INITRD
621 initrd_start = INITRD_START;
622 initrd_end = initrd_start + INITRD_SIZE;
623 memblock_reserve(INITRD_START, INITRD_SIZE);
624#endif
625}
626
627/*
628 * Check for initrd being in usable memory
629 */
630static void __init check_initrd(void)
631{
632#ifdef CONFIG_BLK_DEV_INITRD
633 if (INITRD_START && INITRD_SIZE &&
634 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
635 pr_err("initrd does not fit memory.\n");
636 memblock_free(INITRD_START, INITRD_SIZE);
637 initrd_start = initrd_end = 0;
638 }
639#endif
640}
641
642/*
643 * Reserve memory used for lowcore/command line/kernel image.
644 */
645static void __init reserve_kernel(void)
646{
647 unsigned long start_pfn = PFN_UP(__pa(&_end));
648
649#ifdef CONFIG_DMA_API_DEBUG
650 /*
651 * DMA_API_DEBUG code stumbles over addresses from the
652 * range [_ehead, _stext]. Mark the memory as reserved
653 * so it is not used for CONFIG_DMA_API_DEBUG=y.
654 */
655 memblock_reserve(0, PFN_PHYS(start_pfn));
656#else
657 memblock_reserve(0, (unsigned long)_ehead);
658 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
659 - (unsigned long)_stext);
660#endif
661}
662
663static void __init setup_memory(void)
664{
665 struct memblock_region *reg;
666
667 /*
668 * Init storage key for present memory
669 */
670 for_each_memblock(memory, reg) {
671 storage_key_init_range(reg->base, reg->base + reg->size);
672 }
673 psw_set_key(PAGE_DEFAULT_KEY);
674
675 /* Only cosmetics */
676 memblock_enforce_memory_limit(memblock_end_of_DRAM());
677}
678
679/*
680 * Setup hardware capabilities.
681 */
682static int __init setup_hwcaps(void)
683{
684 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
685 struct cpuid cpu_id;
686 int i;
687
688 /*
689 * The store facility list bits numbers as found in the principles
690 * of operation are numbered with bit 1UL<<31 as number 0 to
691 * bit 1UL<<0 as number 31.
692 * Bit 0: instructions named N3, "backported" to esa-mode
693 * Bit 2: z/Architecture mode is active
694 * Bit 7: the store-facility-list-extended facility is installed
695 * Bit 17: the message-security assist is installed
696 * Bit 19: the long-displacement facility is installed
697 * Bit 21: the extended-immediate facility is installed
698 * Bit 22: extended-translation facility 3 is installed
699 * Bit 30: extended-translation facility 3 enhancement facility
700 * These get translated to:
701 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
702 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
703 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
704 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
705 */
706 for (i = 0; i < 6; i++)
707 if (test_facility(stfl_bits[i]))
708 elf_hwcap |= 1UL << i;
709
710 if (test_facility(22) && test_facility(30))
711 elf_hwcap |= HWCAP_S390_ETF3EH;
712
713 /*
714 * Check for additional facilities with store-facility-list-extended.
715 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
716 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
717 * as stored by stfl, bits 32-xxx contain additional facilities.
718 * How many facility words are stored depends on the number of
719 * doublewords passed to the instruction. The additional facilities
720 * are:
721 * Bit 42: decimal floating point facility is installed
722 * Bit 44: perform floating point operation facility is installed
723 * translated to:
724 * HWCAP_S390_DFP bit 6 (42 && 44).
725 */
726 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
727 elf_hwcap |= HWCAP_S390_DFP;
728
729 /*
730 * Huge page support HWCAP_S390_HPAGE is bit 7.
731 */
732 if (MACHINE_HAS_HPAGE)
733 elf_hwcap |= HWCAP_S390_HPAGE;
734
735 /*
736 * 64-bit register support for 31-bit processes
737 * HWCAP_S390_HIGH_GPRS is bit 9.
738 */
739 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
740
741 /*
742 * Transactional execution support HWCAP_S390_TE is bit 10.
743 */
744 if (test_facility(50) && test_facility(73))
745 elf_hwcap |= HWCAP_S390_TE;
746
747 /*
748 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
749 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
750 * instead of facility bit 129.
751 */
752 if (MACHINE_HAS_VX)
753 elf_hwcap |= HWCAP_S390_VXRS;
754 get_cpu_id(&cpu_id);
755 add_device_randomness(&cpu_id, sizeof(cpu_id));
756 switch (cpu_id.machine) {
757 case 0x2064:
758 case 0x2066:
759 default: /* Use "z900" as default for 64 bit kernels. */
760 strcpy(elf_platform, "z900");
761 break;
762 case 0x2084:
763 case 0x2086:
764 strcpy(elf_platform, "z990");
765 break;
766 case 0x2094:
767 case 0x2096:
768 strcpy(elf_platform, "z9-109");
769 break;
770 case 0x2097:
771 case 0x2098:
772 strcpy(elf_platform, "z10");
773 break;
774 case 0x2817:
775 case 0x2818:
776 strcpy(elf_platform, "z196");
777 break;
778 case 0x2827:
779 case 0x2828:
780 strcpy(elf_platform, "zEC12");
781 break;
782 case 0x2964:
783 case 0x2965:
784 strcpy(elf_platform, "z13");
785 break;
786 }
787
788 /*
789 * Virtualization support HWCAP_INT_SIE is bit 0.
790 */
791 if (sclp.has_sief2)
792 int_hwcap |= HWCAP_INT_SIE;
793
794 return 0;
795}
796arch_initcall(setup_hwcaps);
797
798/*
799 * Add system information as device randomness
800 */
801static void __init setup_randomness(void)
802{
803 struct sysinfo_3_2_2 *vmms;
804
805 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
806 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
807 add_device_randomness(&vmms, vmms->count);
808 free_page((unsigned long) vmms);
809}
810
811/*
812 * Setup function called from init/main.c just after the banner
813 * was printed.
814 */
815
816void __init setup_arch(char **cmdline_p)
817{
818 /*
819 * print what head.S has found out about the machine
820 */
821 if (MACHINE_IS_VM)
822 pr_info("Linux is running as a z/VM "
823 "guest operating system in 64-bit mode\n");
824 else if (MACHINE_IS_KVM)
825 pr_info("Linux is running under KVM in 64-bit mode\n");
826 else if (MACHINE_IS_LPAR)
827 pr_info("Linux is running natively in 64-bit mode\n");
828
829 /* Have one command line that is parsed and saved in /proc/cmdline */
830 /* boot_command_line has been already set up in early.c */
831 *cmdline_p = boot_command_line;
832
833 ROOT_DEV = Root_RAM0;
834
835 /* Is init_mm really needed? */
836 init_mm.start_code = PAGE_OFFSET;
837 init_mm.end_code = (unsigned long) &_etext;
838 init_mm.end_data = (unsigned long) &_edata;
839 init_mm.brk = (unsigned long) &_end;
840
841 parse_early_param();
842#ifdef CONFIG_CRASH_DUMP
843 /* Deactivate elfcorehdr= kernel parameter */
844 elfcorehdr_addr = ELFCORE_ADDR_MAX;
845#endif
846
847 os_info_init();
848 setup_ipl();
849
850 /* Do some memory reservations *before* memory is added to memblock */
851 reserve_memory_end();
852 reserve_oldmem();
853 reserve_kernel();
854 reserve_initrd();
855 memblock_allow_resize();
856
857 /* Get information about *all* installed memory */
858 detect_memory_memblock();
859
860 remove_oldmem();
861
862 /*
863 * Make sure all chunks are MAX_ORDER aligned so we don't need the
864 * extra checks that HOLES_IN_ZONE would require.
865 *
866 * Is this still required?
867 */
868 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
869
870 setup_memory_end();
871 setup_memory();
872
873 check_initrd();
874 reserve_crashkernel();
875#ifdef CONFIG_CRASH_DUMP
876 /*
877 * Be aware that smp_save_dump_cpus() triggers a system reset.
878 * Therefore CPU and device initialization should be done afterwards.
879 */
880 smp_save_dump_cpus();
881#endif
882
883 setup_resources();
884 setup_vmcoreinfo();
885 setup_lowcore();
886 smp_fill_possible_mask();
887 cpu_init();
888 numa_setup();
889
890 /*
891 * Create kernel page tables and switch to virtual addressing.
892 */
893 paging_init();
894
895 /* Setup default console */
896 conmode_default();
897 set_preferred_console();
898
899 /* Setup zfcpdump support */
900 setup_zfcpdump();
901
902 /* Add system specific data to the random pool */
903 setup_randomness();
904}