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TOMOYO Linux Cross Reference
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 "entry.h"
 66 
 67 /*
 68  * Machine setup..
 69  */
 70 unsigned int console_mode = 0;
 71 EXPORT_SYMBOL(console_mode);
 72 
 73 unsigned int console_devno = -1;
 74 EXPORT_SYMBOL(console_devno);
 75 
 76 unsigned int console_irq = -1;
 77 EXPORT_SYMBOL(console_irq);
 78 
 79 unsigned long elf_hwcap = 0;
 80 char elf_platform[ELF_PLATFORM_SIZE];
 81 
 82 int __initdata memory_end_set;
 83 unsigned long __initdata memory_end;
 84 unsigned long __initdata max_physmem_end;
 85 
 86 unsigned long VMALLOC_START;
 87 EXPORT_SYMBOL(VMALLOC_START);
 88 
 89 unsigned long VMALLOC_END;
 90 EXPORT_SYMBOL(VMALLOC_END);
 91 
 92 struct page *vmemmap;
 93 EXPORT_SYMBOL(vmemmap);
 94 
 95 unsigned long MODULES_VADDR;
 96 unsigned long MODULES_END;
 97 
 98 /* An array with a pointer to the lowcore of every CPU. */
 99 struct _lowcore *lowcore_ptr[NR_CPUS];
100 EXPORT_SYMBOL(lowcore_ptr);
101 
102 /*
103  * This is set up by the setup-routine at boot-time
104  * for S390 need to find out, what we have to setup
105  * using address 0x10400 ...
106  */
107 
108 #include <asm/setup.h>
109 
110 /*
111  * condev= and conmode= setup parameter.
112  */
113 
114 static int __init condev_setup(char *str)
115 {
116         int vdev;
117 
118         vdev = simple_strtoul(str, &str, 0);
119         if (vdev >= 0 && vdev < 65536) {
120                 console_devno = vdev;
121                 console_irq = -1;
122         }
123         return 1;
124 }
125 
126 __setup("condev=", condev_setup);
127 
128 static void __init set_preferred_console(void)
129 {
130         if (MACHINE_IS_KVM) {
131                 if (sclp_has_vt220())
132                         add_preferred_console("ttyS", 1, NULL);
133                 else if (sclp_has_linemode())
134                         add_preferred_console("ttyS", 0, NULL);
135                 else
136                         add_preferred_console("hvc", 0, NULL);
137         } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
138                 add_preferred_console("ttyS", 0, NULL);
139         else if (CONSOLE_IS_3270)
140                 add_preferred_console("tty3270", 0, NULL);
141 }
142 
143 static int __init conmode_setup(char *str)
144 {
145 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
146         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
147                 SET_CONSOLE_SCLP;
148 #endif
149 #if defined(CONFIG_TN3215_CONSOLE)
150         if (strncmp(str, "3215", 5) == 0)
151                 SET_CONSOLE_3215;
152 #endif
153 #if defined(CONFIG_TN3270_CONSOLE)
154         if (strncmp(str, "3270", 5) == 0)
155                 SET_CONSOLE_3270;
156 #endif
157         set_preferred_console();
158         return 1;
159 }
160 
161 __setup("conmode=", conmode_setup);
162 
163 static void __init conmode_default(void)
164 {
165         char query_buffer[1024];
166         char *ptr;
167 
168         if (MACHINE_IS_VM) {
169                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
170                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
171                 ptr = strstr(query_buffer, "SUBCHANNEL =");
172                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
173                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
174                 ptr = strstr(query_buffer, "CONMODE");
175                 /*
176                  * Set the conmode to 3215 so that the device recognition 
177                  * will set the cu_type of the console to 3215. If the
178                  * conmode is 3270 and we don't set it back then both
179                  * 3215 and the 3270 driver will try to access the console
180                  * device (3215 as console and 3270 as normal tty).
181                  */
182                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
183                 if (ptr == NULL) {
184 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
185                         SET_CONSOLE_SCLP;
186 #endif
187                         return;
188                 }
189                 if (strncmp(ptr + 8, "3270", 4) == 0) {
190 #if defined(CONFIG_TN3270_CONSOLE)
191                         SET_CONSOLE_3270;
192 #elif defined(CONFIG_TN3215_CONSOLE)
193                         SET_CONSOLE_3215;
194 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
195                         SET_CONSOLE_SCLP;
196 #endif
197                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
198 #if defined(CONFIG_TN3215_CONSOLE)
199                         SET_CONSOLE_3215;
200 #elif defined(CONFIG_TN3270_CONSOLE)
201                         SET_CONSOLE_3270;
202 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
203                         SET_CONSOLE_SCLP;
204 #endif
205                 }
206         } else {
207 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
208                 SET_CONSOLE_SCLP;
209 #endif
210         }
211 }
212 
213 #ifdef CONFIG_CRASH_DUMP
214 static void __init setup_zfcpdump(void)
215 {
216         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
217                 return;
218         if (OLDMEM_BASE)
219                 return;
220         strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
221         console_loglevel = 2;
222 }
223 #else
224 static inline void setup_zfcpdump(void) {}
225 #endif /* CONFIG_CRASH_DUMP */
226 
227  /*
228  * Reboot, halt and power_off stubs. They just call _machine_restart,
229  * _machine_halt or _machine_power_off. 
230  */
231 
232 void machine_restart(char *command)
233 {
234         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
235                 /*
236                  * Only unblank the console if we are called in enabled
237                  * context or a bust_spinlocks cleared the way for us.
238                  */
239                 console_unblank();
240         _machine_restart(command);
241 }
242 
243 void machine_halt(void)
244 {
245         if (!in_interrupt() || oops_in_progress)
246                 /*
247                  * Only unblank the console if we are called in enabled
248                  * context or a bust_spinlocks cleared the way for us.
249                  */
250                 console_unblank();
251         _machine_halt();
252 }
253 
254 void machine_power_off(void)
255 {
256         if (!in_interrupt() || oops_in_progress)
257                 /*
258                  * Only unblank the console if we are called in enabled
259                  * context or a bust_spinlocks cleared the way for us.
260                  */
261                 console_unblank();
262         _machine_power_off();
263 }
264 
265 /*
266  * Dummy power off function.
267  */
268 void (*pm_power_off)(void) = machine_power_off;
269 EXPORT_SYMBOL_GPL(pm_power_off);
270 
271 static int __init early_parse_mem(char *p)
272 {
273         memory_end = memparse(p, &p);
274         memory_end &= PAGE_MASK;
275         memory_end_set = 1;
276         return 0;
277 }
278 early_param("mem", early_parse_mem);
279 
280 static int __init parse_vmalloc(char *arg)
281 {
282         if (!arg)
283                 return -EINVAL;
284         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
285         return 0;
286 }
287 early_param("vmalloc", parse_vmalloc);
288 
289 void *restart_stack __attribute__((__section__(".data")));
290 
291 static void __init setup_lowcore(void)
292 {
293         struct _lowcore *lc;
294 
295         /*
296          * Setup lowcore for boot cpu
297          */
298         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
299         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
300         lc->restart_psw.mask = PSW_KERNEL_BITS;
301         lc->restart_psw.addr =
302                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
303         lc->external_new_psw.mask = PSW_KERNEL_BITS |
304                 PSW_MASK_DAT | PSW_MASK_MCHECK;
305         lc->external_new_psw.addr =
306                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
307         lc->svc_new_psw.mask = PSW_KERNEL_BITS |
308                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
309         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
310         lc->program_new_psw.mask = PSW_KERNEL_BITS |
311                 PSW_MASK_DAT | PSW_MASK_MCHECK;
312         lc->program_new_psw.addr =
313                 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
314         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
315         lc->mcck_new_psw.addr =
316                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
317         lc->io_new_psw.mask = PSW_KERNEL_BITS |
318                 PSW_MASK_DAT | PSW_MASK_MCHECK;
319         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
320         lc->clock_comparator = -1ULL;
321         lc->kernel_stack = ((unsigned long) &init_thread_union)
322                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
323         lc->async_stack = (unsigned long)
324                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
325                 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
326         lc->panic_stack = (unsigned long)
327                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
328                 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
329         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
330         lc->thread_info = (unsigned long) &init_thread_union;
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_get_hsa_size()) {
514                 memory_end = sclp_get_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_get_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 all kernel text
644  */
645 static void __init reserve_kernel(void)
646 {
647         unsigned long start_pfn;
648         start_pfn = PFN_UP(__pa(&_end));
649 
650         /*
651          * Reserve memory used for lowcore/command line/kernel image.
652          */
653         memblock_reserve(0, (unsigned long)_ehead);
654         memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
655                          - (unsigned long)_stext);
656 }
657 
658 static void __init reserve_elfcorehdr(void)
659 {
660 #ifdef CONFIG_CRASH_DUMP
661         if (is_kdump_kernel())
662                 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
663                                  PAGE_ALIGN(elfcorehdr_size));
664 #endif
665 }
666 
667 static void __init setup_memory(void)
668 {
669         struct memblock_region *reg;
670 
671         /*
672          * Init storage key for present memory
673          */
674         for_each_memblock(memory, reg) {
675                 storage_key_init_range(reg->base, reg->base + reg->size);
676         }
677         psw_set_key(PAGE_DEFAULT_KEY);
678 
679         /* Only cosmetics */
680         memblock_enforce_memory_limit(memblock_end_of_DRAM());
681 }
682 
683 /*
684  * Setup hardware capabilities.
685  */
686 static int __init setup_hwcaps(void)
687 {
688         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
689         struct cpuid cpu_id;
690         int i;
691 
692         /*
693          * The store facility list bits numbers as found in the principles
694          * of operation are numbered with bit 1UL<<31 as number 0 to
695          * bit 1UL<<0 as number 31.
696          *   Bit 0: instructions named N3, "backported" to esa-mode
697          *   Bit 2: z/Architecture mode is active
698          *   Bit 7: the store-facility-list-extended facility is installed
699          *   Bit 17: the message-security assist is installed
700          *   Bit 19: the long-displacement facility is installed
701          *   Bit 21: the extended-immediate facility is installed
702          *   Bit 22: extended-translation facility 3 is installed
703          *   Bit 30: extended-translation facility 3 enhancement facility
704          * These get translated to:
705          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
706          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
707          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
708          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
709          */
710         for (i = 0; i < 6; i++)
711                 if (test_facility(stfl_bits[i]))
712                         elf_hwcap |= 1UL << i;
713 
714         if (test_facility(22) && test_facility(30))
715                 elf_hwcap |= HWCAP_S390_ETF3EH;
716 
717         /*
718          * Check for additional facilities with store-facility-list-extended.
719          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
720          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
721          * as stored by stfl, bits 32-xxx contain additional facilities.
722          * How many facility words are stored depends on the number of
723          * doublewords passed to the instruction. The additional facilities
724          * are:
725          *   Bit 42: decimal floating point facility is installed
726          *   Bit 44: perform floating point operation facility is installed
727          * translated to:
728          *   HWCAP_S390_DFP bit 6 (42 && 44).
729          */
730         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
731                 elf_hwcap |= HWCAP_S390_DFP;
732 
733         /*
734          * Huge page support HWCAP_S390_HPAGE is bit 7.
735          */
736         if (MACHINE_HAS_HPAGE)
737                 elf_hwcap |= HWCAP_S390_HPAGE;
738 
739         /*
740          * 64-bit register support for 31-bit processes
741          * HWCAP_S390_HIGH_GPRS is bit 9.
742          */
743         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
744 
745         /*
746          * Transactional execution support HWCAP_S390_TE is bit 10.
747          */
748         if (test_facility(50) && test_facility(73))
749                 elf_hwcap |= HWCAP_S390_TE;
750 
751         /*
752          * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
753          * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
754          * instead of facility bit 129.
755          */
756         if (MACHINE_HAS_VX)
757                 elf_hwcap |= HWCAP_S390_VXRS;
758         get_cpu_id(&cpu_id);
759         add_device_randomness(&cpu_id, sizeof(cpu_id));
760         switch (cpu_id.machine) {
761         case 0x9672:
762                 strcpy(elf_platform, "g5");
763                 break;
764         case 0x2064:
765         case 0x2066:
766         default:        /* Use "z900" as default for 64 bit kernels. */
767                 strcpy(elf_platform, "z900");
768                 break;
769         case 0x2084:
770         case 0x2086:
771                 strcpy(elf_platform, "z990");
772                 break;
773         case 0x2094:
774         case 0x2096:
775                 strcpy(elf_platform, "z9-109");
776                 break;
777         case 0x2097:
778         case 0x2098:
779                 strcpy(elf_platform, "z10");
780                 break;
781         case 0x2817:
782         case 0x2818:
783                 strcpy(elf_platform, "z196");
784                 break;
785         case 0x2827:
786         case 0x2828:
787                 strcpy(elf_platform, "zEC12");
788                 break;
789         case 0x2964:
790                 strcpy(elf_platform, "z13");
791                 break;
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 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
805         if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
806                 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
807         memblock_free((unsigned long) vmms, PAGE_SIZE);
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         os_info_init();
842         setup_ipl();
843 
844         /* Do some memory reservations *before* memory is added to memblock */
845         reserve_memory_end();
846         reserve_oldmem();
847         reserve_kernel();
848         reserve_initrd();
849         reserve_elfcorehdr();
850         memblock_allow_resize();
851 
852         /* Get information about *all* installed memory */
853         detect_memory_memblock();
854 
855         remove_oldmem();
856 
857         /*
858          * Make sure all chunks are MAX_ORDER aligned so we don't need the
859          * extra checks that HOLES_IN_ZONE would require.
860          *
861          * Is this still required?
862          */
863         memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
864 
865         setup_memory_end();
866         setup_memory();
867 
868         check_initrd();
869         reserve_crashkernel();
870 
871         setup_resources();
872         setup_vmcoreinfo();
873         setup_lowcore();
874         smp_fill_possible_mask();
875         cpu_init();
876 
877         /*
878          * Create kernel page tables and switch to virtual addressing.
879          */
880         paging_init();
881 
882         /* Setup default console */
883         conmode_default();
884         set_preferred_console();
885 
886         /* Setup zfcpdump support */
887         setup_zfcpdump();
888 
889         /* Add system specific data to the random pool */
890         setup_randomness();
891 }
892 

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