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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 * 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}