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