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Linux/arch/s390/kernel/setup.c

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  1 /*
  2  *  S390 version
  3  *    Copyright IBM Corp. 1999, 2012
  4  *    Author(s): Hartmut Penner (hp@de.ibm.com),
  5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
  6  *
  7  *  Derived from "arch/i386/kernel/setup.c"
  8  *    Copyright (C) 1995, Linus Torvalds
  9  */
 10 
 11 /*
 12  * This file handles the architecture-dependent parts of initialization
 13  */
 14 
 15 #define KMSG_COMPONENT "setup"
 16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 17 
 18 #include <linux/errno.h>
 19 #include <linux/export.h>
 20 #include <linux/sched.h>
 21 #include <linux/kernel.h>
 22 #include <linux/memblock.h>
 23 #include <linux/mm.h>
 24 #include <linux/stddef.h>
 25 #include <linux/unistd.h>
 26 #include <linux/ptrace.h>
 27 #include <linux/random.h>
 28 #include <linux/user.h>
 29 #include <linux/tty.h>
 30 #include <linux/ioport.h>
 31 #include <linux/delay.h>
 32 #include <linux/init.h>
 33 #include <linux/initrd.h>
 34 #include <linux/bootmem.h>
 35 #include <linux/root_dev.h>
 36 #include <linux/console.h>
 37 #include <linux/kernel_stat.h>
 38 #include <linux/device.h>
 39 #include <linux/notifier.h>
 40 #include <linux/pfn.h>
 41 #include <linux/ctype.h>
 42 #include <linux/reboot.h>
 43 #include <linux/topology.h>
 44 #include <linux/kexec.h>
 45 #include <linux/crash_dump.h>
 46 #include <linux/memory.h>
 47 #include <linux/compat.h>
 48 
 49 #include <asm/ipl.h>
 50 #include <asm/facility.h>
 51 #include <asm/smp.h>
 52 #include <asm/mmu_context.h>
 53 #include <asm/cpcmd.h>
 54 #include <asm/lowcore.h>
 55 #include <asm/irq.h>
 56 #include <asm/page.h>
 57 #include <asm/ptrace.h>
 58 #include <asm/sections.h>
 59 #include <asm/ebcdic.h>
 60 #include <asm/kvm_virtio.h>
 61 #include <asm/diag.h>
 62 #include <asm/os_info.h>
 63 #include <asm/sclp.h>
 64 #include <asm/sysinfo.h>
 65 #include <asm/numa.h>
 66 #include "entry.h"
 67 
 68 /*
 69  * Machine setup..
 70  */
 71 unsigned int console_mode = 0;
 72 EXPORT_SYMBOL(console_mode);
 73 
 74 unsigned int console_devno = -1;
 75 EXPORT_SYMBOL(console_devno);
 76 
 77 unsigned int console_irq = -1;
 78 EXPORT_SYMBOL(console_irq);
 79 
 80 unsigned long elf_hwcap __read_mostly = 0;
 81 char elf_platform[ELF_PLATFORM_SIZE];
 82 
 83 unsigned long int_hwcap = 0;
 84 
 85 int __initdata memory_end_set;
 86 unsigned long __initdata memory_end;
 87 unsigned long __initdata max_physmem_end;
 88 
 89 unsigned long VMALLOC_START;
 90 EXPORT_SYMBOL(VMALLOC_START);
 91 
 92 unsigned long VMALLOC_END;
 93 EXPORT_SYMBOL(VMALLOC_END);
 94 
 95 struct page *vmemmap;
 96 EXPORT_SYMBOL(vmemmap);
 97 
 98 unsigned long MODULES_VADDR;
 99 unsigned long MODULES_END;
100 
101 /* An array with a pointer to the lowcore of every CPU. */
102 struct lowcore *lowcore_ptr[NR_CPUS];
103 EXPORT_SYMBOL(lowcore_ptr);
104 
105 /*
106  * This is set up by the setup-routine at boot-time
107  * for S390 need to find out, what we have to setup
108  * using address 0x10400 ...
109  */
110 
111 #include <asm/setup.h>
112 
113 /*
114  * condev= and conmode= setup parameter.
115  */
116 
117 static int __init condev_setup(char *str)
118 {
119         int vdev;
120 
121         vdev = simple_strtoul(str, &str, 0);
122         if (vdev >= 0 && vdev < 65536) {
123                 console_devno = vdev;
124                 console_irq = -1;
125         }
126         return 1;
127 }
128 
129 __setup("condev=", condev_setup);
130 
131 static void __init set_preferred_console(void)
132 {
133         if (MACHINE_IS_KVM) {
134                 if (sclp.has_vt220)
135                         add_preferred_console("ttyS", 1, NULL);
136                 else if (sclp.has_linemode)
137                         add_preferred_console("ttyS", 0, NULL);
138                 else
139                         add_preferred_console("hvc", 0, NULL);
140         } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
141                 add_preferred_console("ttyS", 0, NULL);
142         else if (CONSOLE_IS_3270)
143                 add_preferred_console("tty3270", 0, NULL);
144 }
145 
146 static int __init conmode_setup(char *str)
147 {
148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
149         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
150                 SET_CONSOLE_SCLP;
151 #endif
152 #if defined(CONFIG_TN3215_CONSOLE)
153         if (strncmp(str, "3215", 5) == 0)
154                 SET_CONSOLE_3215;
155 #endif
156 #if defined(CONFIG_TN3270_CONSOLE)
157         if (strncmp(str, "3270", 5) == 0)
158                 SET_CONSOLE_3270;
159 #endif
160         set_preferred_console();
161         return 1;
162 }
163 
164 __setup("conmode=", conmode_setup);
165 
166 static void __init conmode_default(void)
167 {
168         char query_buffer[1024];
169         char *ptr;
170 
171         if (MACHINE_IS_VM) {
172                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
173                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
174                 ptr = strstr(query_buffer, "SUBCHANNEL =");
175                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
176                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
177                 ptr = strstr(query_buffer, "CONMODE");
178                 /*
179                  * Set the conmode to 3215 so that the device recognition 
180                  * will set the cu_type of the console to 3215. If the
181                  * conmode is 3270 and we don't set it back then both
182                  * 3215 and the 3270 driver will try to access the console
183                  * device (3215 as console and 3270 as normal tty).
184                  */
185                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
186                 if (ptr == NULL) {
187 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
188                         SET_CONSOLE_SCLP;
189 #endif
190                         return;
191                 }
192                 if (strncmp(ptr + 8, "3270", 4) == 0) {
193 #if defined(CONFIG_TN3270_CONSOLE)
194                         SET_CONSOLE_3270;
195 #elif defined(CONFIG_TN3215_CONSOLE)
196                         SET_CONSOLE_3215;
197 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198                         SET_CONSOLE_SCLP;
199 #endif
200                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
201 #if defined(CONFIG_TN3215_CONSOLE)
202                         SET_CONSOLE_3215;
203 #elif defined(CONFIG_TN3270_CONSOLE)
204                         SET_CONSOLE_3270;
205 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
206                         SET_CONSOLE_SCLP;
207 #endif
208                 }
209         } else {
210 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
211                 SET_CONSOLE_SCLP;
212 #endif
213         }
214 }
215 
216 #ifdef CONFIG_CRASH_DUMP
217 static void __init setup_zfcpdump(void)
218 {
219         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
220                 return;
221         if (OLDMEM_BASE)
222                 return;
223         strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
224         console_loglevel = 2;
225 }
226 #else
227 static inline void setup_zfcpdump(void) {}
228 #endif /* CONFIG_CRASH_DUMP */
229 
230  /*
231  * Reboot, halt and power_off stubs. They just call _machine_restart,
232  * _machine_halt or _machine_power_off. 
233  */
234 
235 void machine_restart(char *command)
236 {
237         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
238                 /*
239                  * Only unblank the console if we are called in enabled
240                  * context or a bust_spinlocks cleared the way for us.
241                  */
242                 console_unblank();
243         _machine_restart(command);
244 }
245 
246 void machine_halt(void)
247 {
248         if (!in_interrupt() || oops_in_progress)
249                 /*
250                  * Only unblank the console if we are called in enabled
251                  * context or a bust_spinlocks cleared the way for us.
252                  */
253                 console_unblank();
254         _machine_halt();
255 }
256 
257 void machine_power_off(void)
258 {
259         if (!in_interrupt() || oops_in_progress)
260                 /*
261                  * Only unblank the console if we are called in enabled
262                  * context or a bust_spinlocks cleared the way for us.
263                  */
264                 console_unblank();
265         _machine_power_off();
266 }
267 
268 /*
269  * Dummy power off function.
270  */
271 void (*pm_power_off)(void) = machine_power_off;
272 EXPORT_SYMBOL_GPL(pm_power_off);
273 
274 static int __init early_parse_mem(char *p)
275 {
276         memory_end = memparse(p, &p);
277         memory_end &= PAGE_MASK;
278         memory_end_set = 1;
279         return 0;
280 }
281 early_param("mem", early_parse_mem);
282 
283 static int __init parse_vmalloc(char *arg)
284 {
285         if (!arg)
286                 return -EINVAL;
287         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
288         return 0;
289 }
290 early_param("vmalloc", parse_vmalloc);
291 
292 void *restart_stack __attribute__((__section__(".data")));
293 
294 static void __init setup_lowcore(void)
295 {
296         struct lowcore *lc;
297 
298         /*
299          * Setup lowcore for boot cpu
300          */
301         BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
302         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
303         lc->restart_psw.mask = PSW_KERNEL_BITS;
304         lc->restart_psw.addr = (unsigned long) restart_int_handler;
305         lc->external_new_psw.mask = PSW_KERNEL_BITS |
306                 PSW_MASK_DAT | PSW_MASK_MCHECK;
307         lc->external_new_psw.addr = (unsigned long) ext_int_handler;
308         lc->svc_new_psw.mask = PSW_KERNEL_BITS |
309                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
310         lc->svc_new_psw.addr = (unsigned long) system_call;
311         lc->program_new_psw.mask = PSW_KERNEL_BITS |
312                 PSW_MASK_DAT | PSW_MASK_MCHECK;
313         lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
314         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
315         lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
316         lc->io_new_psw.mask = PSW_KERNEL_BITS |
317                 PSW_MASK_DAT | PSW_MASK_MCHECK;
318         lc->io_new_psw.addr = (unsigned long) io_int_handler;
319         lc->clock_comparator = -1ULL;
320         lc->kernel_stack = ((unsigned long) &init_thread_union)
321                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
322         lc->async_stack = (unsigned long)
323                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
324                 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
325         lc->panic_stack = (unsigned long)
326                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
327                 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
328         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
329         lc->thread_info = (unsigned long) &init_thread_union;
330         lc->lpp = LPP_MAGIC;
331         lc->machine_flags = S390_lowcore.machine_flags;
332         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
333         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
334                MAX_FACILITY_BIT/8);
335         if (MACHINE_HAS_VX)
336                 lc->vector_save_area_addr =
337                         (unsigned long) &lc->vector_save_area;
338         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
339         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
340         lc->async_enter_timer = S390_lowcore.async_enter_timer;
341         lc->exit_timer = S390_lowcore.exit_timer;
342         lc->user_timer = S390_lowcore.user_timer;
343         lc->system_timer = S390_lowcore.system_timer;
344         lc->steal_timer = S390_lowcore.steal_timer;
345         lc->last_update_timer = S390_lowcore.last_update_timer;
346         lc->last_update_clock = S390_lowcore.last_update_clock;
347 
348         restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
349         restart_stack += ASYNC_SIZE;
350 
351         /*
352          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
353          * restart data to the absolute zero lowcore. This is necessary if
354          * PSW restart is done on an offline CPU that has lowcore zero.
355          */
356         lc->restart_stack = (unsigned long) restart_stack;
357         lc->restart_fn = (unsigned long) do_restart;
358         lc->restart_data = 0;
359         lc->restart_source = -1UL;
360 
361         /* Setup absolute zero lowcore */
362         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
363         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
364         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
365         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
366         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
367 
368 #ifdef CONFIG_SMP
369         lc->spinlock_lockval = arch_spin_lockval(0);
370 #endif
371 
372         set_prefix((u32)(unsigned long) lc);
373         lowcore_ptr[0] = lc;
374 }
375 
376 static struct resource code_resource = {
377         .name  = "Kernel code",
378         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
379 };
380 
381 static struct resource data_resource = {
382         .name = "Kernel data",
383         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
384 };
385 
386 static struct resource bss_resource = {
387         .name = "Kernel bss",
388         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
389 };
390 
391 static struct resource __initdata *standard_resources[] = {
392         &code_resource,
393         &data_resource,
394         &bss_resource,
395 };
396 
397 static void __init setup_resources(void)
398 {
399         struct resource *res, *std_res, *sub_res;
400         struct memblock_region *reg;
401         int j;
402 
403         code_resource.start = (unsigned long) &_text;
404         code_resource.end = (unsigned long) &_etext - 1;
405         data_resource.start = (unsigned long) &_etext;
406         data_resource.end = (unsigned long) &_edata - 1;
407         bss_resource.start = (unsigned long) &__bss_start;
408         bss_resource.end = (unsigned long) &__bss_stop - 1;
409 
410         for_each_memblock(memory, reg) {
411                 res = alloc_bootmem_low(sizeof(*res));
412                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
413 
414                 res->name = "System RAM";
415                 res->start = reg->base;
416                 res->end = reg->base + reg->size - 1;
417                 request_resource(&iomem_resource, res);
418 
419                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
420                         std_res = standard_resources[j];
421                         if (std_res->start < res->start ||
422                             std_res->start > res->end)
423                                 continue;
424                         if (std_res->end > res->end) {
425                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
426                                 *sub_res = *std_res;
427                                 sub_res->end = res->end;
428                                 std_res->start = res->end + 1;
429                                 request_resource(res, sub_res);
430                         } else {
431                                 request_resource(res, std_res);
432                         }
433                 }
434         }
435 }
436 
437 static void __init setup_memory_end(void)
438 {
439         unsigned long vmax, vmalloc_size, tmp;
440 
441         /* Choose kernel address space layout: 2, 3, or 4 levels. */
442         vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
443         tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
444         tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
445         if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
446                 vmax = 1UL << 42;       /* 3-level kernel page table */
447         else
448                 vmax = 1UL << 53;       /* 4-level kernel page table */
449         /* module area is at the end of the kernel address space. */
450         MODULES_END = vmax;
451         MODULES_VADDR = MODULES_END - MODULES_LEN;
452         VMALLOC_END = MODULES_VADDR;
453         VMALLOC_START = vmax - vmalloc_size;
454 
455         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
456         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
457         /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
458         tmp = SECTION_ALIGN_UP(tmp);
459         tmp = VMALLOC_START - tmp * sizeof(struct page);
460         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
461         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
462         vmemmap = (struct page *) tmp;
463 
464         /* Take care that memory_end is set and <= vmemmap */
465         memory_end = min(memory_end ?: max_physmem_end, tmp);
466         max_pfn = max_low_pfn = PFN_DOWN(memory_end);
467         memblock_remove(memory_end, ULONG_MAX);
468 
469         pr_notice("Max memory size: %luMB\n", memory_end >> 20);
470 }
471 
472 static void __init setup_vmcoreinfo(void)
473 {
474         mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
475 }
476 
477 #ifdef CONFIG_CRASH_DUMP
478 
479 /*
480  * When kdump is enabled, we have to ensure that no memory from
481  * the area [0 - crashkernel memory size] and
482  * [crashk_res.start - crashk_res.end] is set offline.
483  */
484 static int kdump_mem_notifier(struct notifier_block *nb,
485                               unsigned long action, void *data)
486 {
487         struct memory_notify *arg = data;
488 
489         if (action != MEM_GOING_OFFLINE)
490                 return NOTIFY_OK;
491         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
492                 return NOTIFY_BAD;
493         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
494                 return NOTIFY_OK;
495         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
496                 return NOTIFY_OK;
497         return NOTIFY_BAD;
498 }
499 
500 static struct notifier_block kdump_mem_nb = {
501         .notifier_call = kdump_mem_notifier,
502 };
503 
504 #endif
505 
506 /*
507  * Make sure that the area behind memory_end is protected
508  */
509 static void reserve_memory_end(void)
510 {
511 #ifdef CONFIG_CRASH_DUMP
512         if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
513             !OLDMEM_BASE && sclp.hsa_size) {
514                 memory_end = sclp.hsa_size;
515                 memory_end &= PAGE_MASK;
516                 memory_end_set = 1;
517         }
518 #endif
519         if (!memory_end_set)
520                 return;
521         memblock_reserve(memory_end, ULONG_MAX);
522 }
523 
524 /*
525  * Make sure that oldmem, where the dump is stored, is protected
526  */
527 static void reserve_oldmem(void)
528 {
529 #ifdef CONFIG_CRASH_DUMP
530         if (OLDMEM_BASE)
531                 /* Forget all memory above the running kdump system */
532                 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
533 #endif
534 }
535 
536 /*
537  * Make sure that oldmem, where the dump is stored, is protected
538  */
539 static void remove_oldmem(void)
540 {
541 #ifdef CONFIG_CRASH_DUMP
542         if (OLDMEM_BASE)
543                 /* Forget all memory above the running kdump system */
544                 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
545 #endif
546 }
547 
548 /*
549  * Reserve memory for kdump kernel to be loaded with kexec
550  */
551 static void __init reserve_crashkernel(void)
552 {
553 #ifdef CONFIG_CRASH_DUMP
554         unsigned long long crash_base, crash_size;
555         phys_addr_t low, high;
556         int rc;
557 
558         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
559                                &crash_base);
560 
561         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
562         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
563         if (rc || crash_size == 0)
564                 return;
565 
566         if (memblock.memory.regions[0].size < crash_size) {
567                 pr_info("crashkernel reservation failed: %s\n",
568                         "first memory chunk must be at least crashkernel size");
569                 return;
570         }
571 
572         low = crash_base ?: OLDMEM_BASE;
573         high = low + crash_size;
574         if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
575                 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
576                 crash_base = low;
577         } else {
578                 /* Find suitable area in free memory */
579                 low = max_t(unsigned long, crash_size, sclp.hsa_size);
580                 high = crash_base ? crash_base + crash_size : ULONG_MAX;
581 
582                 if (crash_base && crash_base < low) {
583                         pr_info("crashkernel reservation failed: %s\n",
584                                 "crash_base too low");
585                         return;
586                 }
587                 low = crash_base ?: low;
588                 crash_base = memblock_find_in_range(low, high, crash_size,
589                                                     KEXEC_CRASH_MEM_ALIGN);
590         }
591 
592         if (!crash_base) {
593                 pr_info("crashkernel reservation failed: %s\n",
594                         "no suitable area found");
595                 return;
596         }
597 
598         if (register_memory_notifier(&kdump_mem_nb))
599                 return;
600 
601         if (!OLDMEM_BASE && MACHINE_IS_VM)
602                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
603         crashk_res.start = crash_base;
604         crashk_res.end = crash_base + crash_size - 1;
605         insert_resource(&iomem_resource, &crashk_res);
606         memblock_remove(crash_base, crash_size);
607         pr_info("Reserving %lluMB of memory at %lluMB "
608                 "for crashkernel (System RAM: %luMB)\n",
609                 crash_size >> 20, crash_base >> 20,
610                 (unsigned long)memblock.memory.total_size >> 20);
611         os_info_crashkernel_add(crash_base, crash_size);
612 #endif
613 }
614 
615 /*
616  * Reserve the initrd from being used by memblock
617  */
618 static void __init reserve_initrd(void)
619 {
620 #ifdef CONFIG_BLK_DEV_INITRD
621         initrd_start = INITRD_START;
622         initrd_end = initrd_start + INITRD_SIZE;
623         memblock_reserve(INITRD_START, INITRD_SIZE);
624 #endif
625 }
626 
627 /*
628  * Check for initrd being in usable memory
629  */
630 static void __init check_initrd(void)
631 {
632 #ifdef CONFIG_BLK_DEV_INITRD
633         if (INITRD_START && INITRD_SIZE &&
634             !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
635                 pr_err("initrd does not fit memory.\n");
636                 memblock_free(INITRD_START, INITRD_SIZE);
637                 initrd_start = initrd_end = 0;
638         }
639 #endif
640 }
641 
642 /*
643  * Reserve memory used for lowcore/command line/kernel image.
644  */
645 static void __init reserve_kernel(void)
646 {
647         unsigned long start_pfn = PFN_UP(__pa(&_end));
648 
649 #ifdef CONFIG_DMA_API_DEBUG
650         /*
651          * DMA_API_DEBUG code stumbles over addresses from the
652          * range [_ehead, _stext]. Mark the memory as reserved
653          * so it is not used for CONFIG_DMA_API_DEBUG=y.
654          */
655         memblock_reserve(0, PFN_PHYS(start_pfn));
656 #else
657         memblock_reserve(0, (unsigned long)_ehead);
658         memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
659                          - (unsigned long)_stext);
660 #endif
661 }
662 
663 static void __init setup_memory(void)
664 {
665         struct memblock_region *reg;
666 
667         /*
668          * Init storage key for present memory
669          */
670         for_each_memblock(memory, reg) {
671                 storage_key_init_range(reg->base, reg->base + reg->size);
672         }
673         psw_set_key(PAGE_DEFAULT_KEY);
674 
675         /* Only cosmetics */
676         memblock_enforce_memory_limit(memblock_end_of_DRAM());
677 }
678 
679 /*
680  * Setup hardware capabilities.
681  */
682 static int __init setup_hwcaps(void)
683 {
684         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
685         struct cpuid cpu_id;
686         int i;
687 
688         /*
689          * The store facility list bits numbers as found in the principles
690          * of operation are numbered with bit 1UL<<31 as number 0 to
691          * bit 1UL<<0 as number 31.
692          *   Bit 0: instructions named N3, "backported" to esa-mode
693          *   Bit 2: z/Architecture mode is active
694          *   Bit 7: the store-facility-list-extended facility is installed
695          *   Bit 17: the message-security assist is installed
696          *   Bit 19: the long-displacement facility is installed
697          *   Bit 21: the extended-immediate facility is installed
698          *   Bit 22: extended-translation facility 3 is installed
699          *   Bit 30: extended-translation facility 3 enhancement facility
700          * These get translated to:
701          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
702          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
703          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
704          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
705          */
706         for (i = 0; i < 6; i++)
707                 if (test_facility(stfl_bits[i]))
708                         elf_hwcap |= 1UL << i;
709 
710         if (test_facility(22) && test_facility(30))
711                 elf_hwcap |= HWCAP_S390_ETF3EH;
712 
713         /*
714          * Check for additional facilities with store-facility-list-extended.
715          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
716          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
717          * as stored by stfl, bits 32-xxx contain additional facilities.
718          * How many facility words are stored depends on the number of
719          * doublewords passed to the instruction. The additional facilities
720          * are:
721          *   Bit 42: decimal floating point facility is installed
722          *   Bit 44: perform floating point operation facility is installed
723          * translated to:
724          *   HWCAP_S390_DFP bit 6 (42 && 44).
725          */
726         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
727                 elf_hwcap |= HWCAP_S390_DFP;
728 
729         /*
730          * Huge page support HWCAP_S390_HPAGE is bit 7.
731          */
732         if (MACHINE_HAS_HPAGE)
733                 elf_hwcap |= HWCAP_S390_HPAGE;
734 
735         /*
736          * 64-bit register support for 31-bit processes
737          * HWCAP_S390_HIGH_GPRS is bit 9.
738          */
739         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
740 
741         /*
742          * Transactional execution support HWCAP_S390_TE is bit 10.
743          */
744         if (test_facility(50) && test_facility(73))
745                 elf_hwcap |= HWCAP_S390_TE;
746 
747         /*
748          * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
749          * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
750          * instead of facility bit 129.
751          */
752         if (MACHINE_HAS_VX)
753                 elf_hwcap |= HWCAP_S390_VXRS;
754         get_cpu_id(&cpu_id);
755         add_device_randomness(&cpu_id, sizeof(cpu_id));
756         switch (cpu_id.machine) {
757         case 0x2064:
758         case 0x2066:
759         default:        /* Use "z900" as default for 64 bit kernels. */
760                 strcpy(elf_platform, "z900");
761                 break;
762         case 0x2084:
763         case 0x2086:
764                 strcpy(elf_platform, "z990");
765                 break;
766         case 0x2094:
767         case 0x2096:
768                 strcpy(elf_platform, "z9-109");
769                 break;
770         case 0x2097:
771         case 0x2098:
772                 strcpy(elf_platform, "z10");
773                 break;
774         case 0x2817:
775         case 0x2818:
776                 strcpy(elf_platform, "z196");
777                 break;
778         case 0x2827:
779         case 0x2828:
780                 strcpy(elf_platform, "zEC12");
781                 break;
782         case 0x2964:
783                 strcpy(elf_platform, "z13");
784                 break;
785         }
786 
787         /*
788          * Virtualization support HWCAP_INT_SIE is bit 0.
789          */
790         if (sclp.has_sief2)
791                 int_hwcap |= HWCAP_INT_SIE;
792 
793         return 0;
794 }
795 arch_initcall(setup_hwcaps);
796 
797 /*
798  * Add system information as device randomness
799  */
800 static void __init setup_randomness(void)
801 {
802         struct sysinfo_3_2_2 *vmms;
803 
804         vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
805         if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
806                 add_device_randomness(&vmms, vmms->count);
807         free_page((unsigned long) vmms);
808 }
809 
810 /*
811  * Setup function called from init/main.c just after the banner
812  * was printed.
813  */
814 
815 void __init setup_arch(char **cmdline_p)
816 {
817         /*
818          * print what head.S has found out about the machine
819          */
820         if (MACHINE_IS_VM)
821                 pr_info("Linux is running as a z/VM "
822                         "guest operating system in 64-bit mode\n");
823         else if (MACHINE_IS_KVM)
824                 pr_info("Linux is running under KVM in 64-bit mode\n");
825         else if (MACHINE_IS_LPAR)
826                 pr_info("Linux is running natively in 64-bit mode\n");
827 
828         /* Have one command line that is parsed and saved in /proc/cmdline */
829         /* boot_command_line has been already set up in early.c */
830         *cmdline_p = boot_command_line;
831 
832         ROOT_DEV = Root_RAM0;
833 
834         /* Is init_mm really needed? */
835         init_mm.start_code = PAGE_OFFSET;
836         init_mm.end_code = (unsigned long) &_etext;
837         init_mm.end_data = (unsigned long) &_edata;
838         init_mm.brk = (unsigned long) &_end;
839 
840         parse_early_param();
841 #ifdef CONFIG_CRASH_DUMP
842         /* Deactivate elfcorehdr= kernel parameter */
843         elfcorehdr_addr = ELFCORE_ADDR_MAX;
844 #endif
845 
846         os_info_init();
847         setup_ipl();
848 
849         /* Do some memory reservations *before* memory is added to memblock */
850         reserve_memory_end();
851         reserve_oldmem();
852         reserve_kernel();
853         reserve_initrd();
854         memblock_allow_resize();
855 
856         /* Get information about *all* installed memory */
857         detect_memory_memblock();
858 
859         remove_oldmem();
860 
861         /*
862          * Make sure all chunks are MAX_ORDER aligned so we don't need the
863          * extra checks that HOLES_IN_ZONE would require.
864          *
865          * Is this still required?
866          */
867         memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
868 
869         setup_memory_end();
870         setup_memory();
871 
872         check_initrd();
873         reserve_crashkernel();
874 #ifdef CONFIG_CRASH_DUMP
875         /*
876          * Be aware that smp_save_dump_cpus() triggers a system reset.
877          * Therefore CPU and device initialization should be done afterwards.
878          */
879         smp_save_dump_cpus();
880 #endif
881 
882         setup_resources();
883         setup_vmcoreinfo();
884         setup_lowcore();
885         smp_fill_possible_mask();
886         cpu_init();
887         numa_setup();
888 
889         /*
890          * Create kernel page tables and switch to virtual addressing.
891          */
892         paging_init();
893 
894         /* Setup default console */
895         conmode_default();
896         set_preferred_console();
897 
898         /* Setup zfcpdump support */
899         setup_zfcpdump();
900 
901         /* Add system specific data to the random pool */
902         setup_randomness();
903 }
904 

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