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   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #define KMSG_COMPONENT "setup"
  18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  19
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/sched.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/stddef.h>
  26 #include <linux/unistd.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/slab.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
  46 #include <asm/ipl.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/system.h>
  49 #include <asm/smp.h>
  50 #include <asm/mmu_context.h>
  51 #include <asm/cpcmd.h>
  52 #include <asm/lowcore.h>
  53 #include <asm/irq.h>
  54 #include <asm/page.h>
  55 #include <asm/ptrace.h>
  56 #include <asm/sections.h>
  57 #include <asm/ebcdic.h>
  58 #include <asm/compat.h>
  59 #include <asm/kvm_virtio.h>
  60
  61 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  62                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  63 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  64                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  65                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  66
  67 /*
  68  * User copy operations.
  69  */
  70 struct uaccess_ops uaccess;
  71 EXPORT_SYMBOL(uaccess);
  72
  73 /*
  74  * Machine setup..
  75  */
  76 unsigned int console_mode = 0;
  77 EXPORT_SYMBOL(console_mode);
  78
  79 unsigned int console_devno = -1;
  80 EXPORT_SYMBOL(console_devno);
  81
  82 unsigned int console_irq = -1;
  83 EXPORT_SYMBOL(console_irq);
  84
  85 unsigned long machine_flags;
  86 EXPORT_SYMBOL(machine_flags);
  87
  88 unsigned long elf_hwcap = 0;
  89 char elf_platform[ELF_PLATFORM_SIZE];
  90
  91 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  92 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  93
  94 int __initdata memory_end_set;
  95 unsigned long __initdata memory_end;
  96
  97 /* An array with a pointer to the lowcore of every CPU. */
  98 struct _lowcore *lowcore_ptr[NR_CPUS];
  99 EXPORT_SYMBOL(lowcore_ptr);
 100
 101 /*
 102  * This is set up by the setup-routine at boot-time
 103  * for S390 need to find out, what we have to setup
 104  * using address 0x10400 ...
 105  */
 106
 107 #include <asm/setup.h>
 108
 109 static struct resource code_resource = {
 110         .name  = "Kernel code",
 111         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 112 };
 113
 114 static struct resource data_resource = {
 115         .name = "Kernel data",
 116         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 117 };
 118
 119 /*
 120  * cpu_init() initializes state that is per-CPU.
 121  */
 122 void __cpuinit cpu_init(void)
 123 {
 124         int addr = hard_smp_processor_id();
 125
 126         /*
 127          * Store processor id in lowcore (used e.g. in timer_interrupt)
 128          */
 129         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 130         S390_lowcore.cpu_data.cpu_addr = addr;
 131
 132         /*
 133          * Force FPU initialization:
 134          */
 135         clear_thread_flag(TIF_USEDFPU);
 136         clear_used_math();
 137
 138         atomic_inc(&init_mm.mm_count);
 139         current->active_mm = &init_mm;
 140         if (current->mm)
 141                 BUG();
 142         enter_lazy_tlb(&init_mm, current);
 143 }
 144
 145 /*
 146  * condev= and conmode= setup parameter.
 147  */
 148
 149 static int __init condev_setup(char *str)
 150 {
 151         int vdev;
 152
 153         vdev = simple_strtoul(str, &str, 0);
 154         if (vdev >= 0 && vdev < 65536) {
 155                 console_devno = vdev;
 156                 console_irq = -1;
 157         }
 158         return 1;
 159 }
 160
 161 __setup("condev=", condev_setup);
 162
 163 static int __init conmode_setup(char *str)
 164 {
 165 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 166         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 167                 SET_CONSOLE_SCLP;
 168 #endif
 169 #if defined(CONFIG_TN3215_CONSOLE)
 170         if (strncmp(str, "3215", 5) == 0)
 171                 SET_CONSOLE_3215;
 172 #endif
 173 #if defined(CONFIG_TN3270_CONSOLE)
 174         if (strncmp(str, "3270", 5) == 0)
 175                 SET_CONSOLE_3270;
 176 #endif
 177         return 1;
 178 }
 179
 180 __setup("conmode=", conmode_setup);
 181
 182 static void __init conmode_default(void)
 183 {
 184         char query_buffer[1024];
 185         char *ptr;
 186
 187         if (MACHINE_IS_VM) {
 188                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 189                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 190                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 191                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 192                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 193                 ptr = strstr(query_buffer, "CONMODE");
 194                 /*
 195                  * Set the conmode to 3215 so that the device recognition
 196                  * will set the cu_type of the console to 3215. If the
 197                  * conmode is 3270 and we don't set it back then both
 198                  * 3215 and the 3270 driver will try to access the console
 199                  * device (3215 as console and 3270 as normal tty).
 200                  */
 201                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 202                 if (ptr == NULL) {
 203 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 204                         SET_CONSOLE_SCLP;
 205 #endif
 206                         return;
 207                 }
 208                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 209 #if defined(CONFIG_TN3270_CONSOLE)
 210                         SET_CONSOLE_3270;
 211 #elif defined(CONFIG_TN3215_CONSOLE)
 212                         SET_CONSOLE_3215;
 213 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 214                         SET_CONSOLE_SCLP;
 215 #endif
 216                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 217 #if defined(CONFIG_TN3215_CONSOLE)
 218                         SET_CONSOLE_3215;
 219 #elif defined(CONFIG_TN3270_CONSOLE)
 220                         SET_CONSOLE_3270;
 221 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 222                         SET_CONSOLE_SCLP;
 223 #endif
 224                 }
 225         } else {
 226 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 227                 SET_CONSOLE_SCLP;
 228 #endif
 229         }
 230 }
 231
 232 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 233 static void __init setup_zfcpdump(unsigned int console_devno)
 234 {
 235         static char str[41];
 236
 237         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 238                 return;
 239         if (console_devno != -1)
 240                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 241                         ipl_info.data.fcp.dev_id.devno, console_devno);
 242         else
 243                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 244                         ipl_info.data.fcp.dev_id.devno);
 245         strcat(boot_command_line, str);
 246         console_loglevel = 2;
 247 }
 248 #else
 249 static inline void setup_zfcpdump(unsigned int console_devno) {}
 250 #endif /* CONFIG_ZFCPDUMP */
 251
 252  /*
 253  * Reboot, halt and power_off stubs. They just call _machine_restart,
 254  * _machine_halt or _machine_power_off.
 255  */
 256
 257 void machine_restart(char *command)
 258 {
 259         if ((!in_interrupt() && !in_atomic()) || 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_restart(command);
 266 }
 267
 268 void machine_halt(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_halt();
 277 }
 278
 279 void machine_power_off(void)
 280 {
 281         if (!in_interrupt() || oops_in_progress)
 282                 /*
 283                  * Only unblank the console if we are called in enabled
 284                  * context or a bust_spinlocks cleared the way for us.
 285                  */
 286                 console_unblank();
 287         _machine_power_off();
 288 }
 289
 290 /*
 291  * Dummy power off function.
 292  */
 293 void (*pm_power_off)(void) = machine_power_off;
 294
 295 static int __init early_parse_mem(char *p)
 296 {
 297         memory_end = memparse(p, &p);
 298         memory_end_set = 1;
 299         return 0;
 300 }
 301 early_param("mem", early_parse_mem);
 302
 303 #ifdef CONFIG_S390_SWITCH_AMODE
 304 unsigned int switch_amode = 0;
 305 EXPORT_SYMBOL_GPL(switch_amode);
 306
 307 static int set_amode_and_uaccess(unsigned long user_amode,
 308                                  unsigned long user32_amode)
 309 {
 310         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 311                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 312                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 313 #ifdef CONFIG_COMPAT
 314         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 315                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 316                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 317         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 318                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 319                           PSW32_MASK_PSTATE;
 320 #endif
 321         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 322                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 323
 324         if (MACHINE_HAS_MVCOS) {
 325                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 326                 return 1;
 327         } else {
 328                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 329                 return 0;
 330         }
 331 }
 332
 333 /*
 334  * Switch kernel/user addressing modes?
 335  */
 336 static int __init early_parse_switch_amode(char *p)
 337 {
 338         switch_amode = 1;
 339         return 0;
 340 }
 341 early_param("switch_amode", early_parse_switch_amode);
 342
 343 #else /* CONFIG_S390_SWITCH_AMODE */
 344 static inline int set_amode_and_uaccess(unsigned long user_amode,
 345                                         unsigned long user32_amode)
 346 {
 347         return 0;
 348 }
 349 #endif /* CONFIG_S390_SWITCH_AMODE */
 350
 351 #ifdef CONFIG_S390_EXEC_PROTECT
 352 unsigned int s390_noexec = 0;
 353 EXPORT_SYMBOL_GPL(s390_noexec);
 354
 355 /*
 356  * Enable execute protection?
 357  */
 358 static int __init early_parse_noexec(char *p)
 359 {
 360         if (!strncmp(p, "off", 3))
 361                 return 0;
 362         switch_amode = 1;
 363         s390_noexec = 1;
 364         return 0;
 365 }
 366 early_param("noexec", early_parse_noexec);
 367 #endif /* CONFIG_S390_EXEC_PROTECT */
 368
 369 static void setup_addressing_mode(void)
 370 {
 371         if (s390_noexec) {
 372                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 373                                           PSW32_ASC_SECONDARY))
 374                         pr_info("Execute protection active, "
 375                                 "mvcos available\n");
 376                 else
 377                         pr_info("Execute protection active, "
 378                                 "mvcos not available\n");
 379         } else if (switch_amode) {
 380                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 381                         pr_info("Address spaces switched, "
 382                                 "mvcos available\n");
 383                 else
 384                         pr_info("Address spaces switched, "
 385                                 "mvcos not available\n");
 386         }
 387 #ifdef CONFIG_TRACE_IRQFLAGS
 388         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 389         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 390 #endif
 391 }
 392
 393 static void __init
 394 setup_lowcore(void)
 395 {
 396         struct _lowcore *lc;
 397         int lc_pages;
 398
 399         /*
 400          * Setup lowcore for boot cpu
 401          */
 402         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 403         lc = (struct _lowcore *)
 404                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 405         memset(lc, 0, lc_pages * PAGE_SIZE);
 406         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 407         lc->restart_psw.addr =
 408                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 409         if (switch_amode)
 410                 lc->restart_psw.mask |= PSW_ASC_HOME;
 411         lc->external_new_psw.mask = psw_kernel_bits;
 412         lc->external_new_psw.addr =
 413                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 414         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 415         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 416         lc->program_new_psw.mask = psw_kernel_bits;
 417         lc->program_new_psw.addr =
 418                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 419         lc->mcck_new_psw.mask =
 420                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 421         lc->mcck_new_psw.addr =
 422                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 423         lc->io_new_psw.mask = psw_kernel_bits;
 424         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 425         lc->ipl_device = S390_lowcore.ipl_device;
 426         lc->clock_comparator = -1ULL;
 427         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 428         lc->async_stack = (unsigned long)
 429                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 430         lc->panic_stack = (unsigned long)
 431                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 432         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 433         lc->thread_info = (unsigned long) &init_thread_union;
 434 #ifndef CONFIG_64BIT
 435         if (MACHINE_HAS_IEEE) {
 436                 lc->extended_save_area_addr = (__u32)
 437                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 438                 /* enable extended save area */
 439                 __ctl_set_bit(14, 29);
 440         }
 441 #else
 442         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 443 #endif
 444         set_prefix((u32)(unsigned long) lc);
 445         lowcore_ptr[0] = lc;
 446 }
 447
 448 static void __init
 449 setup_resources(void)
 450 {
 451         struct resource *res, *sub_res;
 452         int i;
 453
 454         code_resource.start = (unsigned long) &_text;
 455         code_resource.end = (unsigned long) &_etext - 1;
 456         data_resource.start = (unsigned long) &_etext;
 457         data_resource.end = (unsigned long) &_edata - 1;
 458
 459         for (i = 0; i < MEMORY_CHUNKS; i++) {
 460                 if (!memory_chunk[i].size)
 461                         continue;
 462                 res = alloc_bootmem_low(sizeof(struct resource));
 463                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 464                 switch (memory_chunk[i].type) {
 465                 case CHUNK_READ_WRITE:
 466                         res->name = "System RAM";
 467                         break;
 468                 case CHUNK_READ_ONLY:
 469                         res->name = "System ROM";
 470                         res->flags |= IORESOURCE_READONLY;
 471                         break;
 472                 default:
 473                         res->name = "reserved";
 474                 }
 475                 res->start = memory_chunk[i].addr;
 476                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 477                 request_resource(&iomem_resource, res);
 478
 479                 if (code_resource.start >= res->start  &&
 480                         code_resource.start <= res->end &&
 481                         code_resource.end > res->end) {
 482                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 483                         memcpy(sub_res, &code_resource,
 484                                 sizeof(struct resource));
 485                         sub_res->end = res->end;
 486                         code_resource.start = res->end + 1;
 487                         request_resource(res, sub_res);
 488                 }
 489
 490                 if (code_resource.start >= res->start &&
 491                         code_resource.start <= res->end &&
 492                         code_resource.end <= res->end)
 493                         request_resource(res, &code_resource);
 494
 495                 if (data_resource.start >= res->start &&
 496                         data_resource.start <= res->end &&
 497                         data_resource.end > res->end) {
 498                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 499                         memcpy(sub_res, &data_resource,
 500                                 sizeof(struct resource));
 501                         sub_res->end = res->end;
 502                         data_resource.start = res->end + 1;
 503                         request_resource(res, sub_res);
 504                 }
 505
 506                 if (data_resource.start >= res->start &&
 507                         data_resource.start <= res->end &&
 508                         data_resource.end <= res->end)
 509                         request_resource(res, &data_resource);
 510         }
 511 }
 512
 513 unsigned long real_memory_size;
 514 EXPORT_SYMBOL_GPL(real_memory_size);
 515
 516 static void __init setup_memory_end(void)
 517 {
 518         unsigned long memory_size;
 519         unsigned long max_mem;
 520         int i;
 521
 522 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 523         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 524                 memory_end = ZFCPDUMP_HSA_SIZE;
 525                 memory_end_set = 1;
 526         }
 527 #endif
 528         memory_size = 0;
 529         memory_end &= PAGE_MASK;
 530
 531         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 532         memory_end = min(max_mem, memory_end);
 533
 534         /*
 535          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 536          * extra checks that HOLES_IN_ZONE would require.
 537          */
 538         for (i = 0; i < MEMORY_CHUNKS; i++) {
 539                 unsigned long start, end;
 540                 struct mem_chunk *chunk;
 541                 unsigned long align;
 542
 543                 chunk = &memory_chunk[i];
 544                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 545                 start = (chunk->addr + align - 1) & ~(align - 1);
 546                 end = (chunk->addr + chunk->size) & ~(align - 1);
 547                 if (start >= end)
 548                         memset(chunk, 0, sizeof(*chunk));
 549                 else {
 550                         chunk->addr = start;
 551                         chunk->size = end - start;
 552                 }
 553         }
 554
 555         for (i = 0; i < MEMORY_CHUNKS; i++) {
 556                 struct mem_chunk *chunk = &memory_chunk[i];
 557
 558                 real_memory_size = max(real_memory_size,
 559                                        chunk->addr + chunk->size);
 560                 if (chunk->addr >= max_mem) {
 561                         memset(chunk, 0, sizeof(*chunk));
 562                         continue;
 563                 }
 564                 if (chunk->addr + chunk->size > max_mem)
 565                         chunk->size = max_mem - chunk->addr;
 566                 memory_size = max(memory_size, chunk->addr + chunk->size);
 567         }
 568         if (!memory_end)
 569                 memory_end = memory_size;
 570 }
 571
 572 static void __init
 573 setup_memory(void)
 574 {
 575         unsigned long bootmap_size;
 576         unsigned long start_pfn, end_pfn;
 577         int i;
 578
 579         /*
 580          * partially used pages are not usable - thus
 581          * we are rounding upwards:
 582          */
 583         start_pfn = PFN_UP(__pa(&_end));
 584         end_pfn = max_pfn = PFN_DOWN(memory_end);
 585
 586 #ifdef CONFIG_BLK_DEV_INITRD
 587         /*
 588          * Move the initrd in case the bitmap of the bootmem allocater
 589          * would overwrite it.
 590          */
 591
 592         if (INITRD_START && INITRD_SIZE) {
 593                 unsigned long bmap_size;
 594                 unsigned long start;
 595
 596                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 597                 bmap_size = PFN_PHYS(bmap_size);
 598
 599                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 600                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 601
 602                         if (start + INITRD_SIZE > memory_end) {
 603                                 pr_err("initrd extends beyond end of "
 604                                        "memory (0x%08lx > 0x%08lx) "
 605                                        "disabling initrd\n",
 606                                        start + INITRD_SIZE, memory_end);
 607                                 INITRD_START = INITRD_SIZE = 0;
 608                         } else {
 609                                 pr_info("Moving initrd (0x%08lx -> "
 610                                         "0x%08lx, size: %ld)\n",
 611                                         INITRD_START, start, INITRD_SIZE);
 612                                 memmove((void *) start, (void *) INITRD_START,
 613                                         INITRD_SIZE);
 614                                 INITRD_START = start;
 615                         }
 616                 }
 617         }
 618 #endif
 619
 620         /*
 621          * Initialize the boot-time allocator
 622          */
 623         bootmap_size = init_bootmem(start_pfn, end_pfn);
 624
 625         /*
 626          * Register RAM areas with the bootmem allocator.
 627          */
 628
 629         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 630                 unsigned long start_chunk, end_chunk, pfn;
 631
 632                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 633                         continue;
 634                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 635                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 636                 end_chunk = min(end_chunk, end_pfn);
 637                 if (start_chunk >= end_chunk)
 638                         continue;
 639                 add_active_range(0, start_chunk, end_chunk);
 640                 pfn = max(start_chunk, start_pfn);
 641                 for (; pfn < end_chunk; pfn++)
 642                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 643         }
 644
 645         psw_set_key(PAGE_DEFAULT_KEY);
 646
 647         free_bootmem_with_active_regions(0, max_pfn);
 648
 649         /*
 650          * Reserve memory used for lowcore/command line/kernel image.
 651          */
 652         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 653         reserve_bootmem((unsigned long)_stext,
 654                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 655                         BOOTMEM_DEFAULT);
 656         /*
 657          * Reserve the bootmem bitmap itself as well. We do this in two
 658          * steps (first step was init_bootmem()) because this catches
 659          * the (very unlikely) case of us accidentally initializing the
 660          * bootmem allocator with an invalid RAM area.
 661          */
 662         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 663                         BOOTMEM_DEFAULT);
 664
 665 #ifdef CONFIG_BLK_DEV_INITRD
 666         if (INITRD_START && INITRD_SIZE) {
 667                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 668                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 669                                         BOOTMEM_DEFAULT);
 670                         initrd_start = INITRD_START;
 671                         initrd_end = initrd_start + INITRD_SIZE;
 672                 } else {
 673                         pr_err("initrd extends beyond end of "
 674                                "memory (0x%08lx > 0x%08lx) "
 675                                "disabling initrd\n",
 676                                initrd_start + INITRD_SIZE, memory_end);
 677                         initrd_start = initrd_end = 0;
 678                 }
 679         }
 680 #endif
 681 }
 682
 683 /*
 684  * Setup hardware capabilities.
 685  */
 686 static void __init setup_hwcaps(void)
 687 {
 688         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 689         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 690         unsigned long long facility_list_extended;
 691         unsigned int facility_list;
 692         int i;
 693
 694         facility_list = stfl();
 695         /*
 696          * The store facility list bits numbers as found in the principles
 697          * of operation are numbered with bit 1UL<<31 as number 0 to
 698          * bit 1UL<<0 as number 31.
 699          *   Bit 0: instructions named N3, "backported" to esa-mode
 700          *   Bit 2: z/Architecture mode is active
 701          *   Bit 7: the store-facility-list-extended facility is installed
 702          *   Bit 17: the message-security assist is installed
 703          *   Bit 19: the long-displacement facility is installed
 704          *   Bit 21: the extended-immediate facility is installed
 705          * These get translated to:
 706          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 707          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 708          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 709          */
 710         for (i = 0; i < 6; i++)
 711                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 712                         elf_hwcap |= 1UL << i;
 713
 714         /*
 715          * Check for additional facilities with store-facility-list-extended.
 716          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 717          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 718          * as stored by stfl, bits 32-xxx contain additional facilities.
 719          * How many facility words are stored depends on the number of
 720          * doublewords passed to the instruction. The additional facilites
 721          * are:
 722          *   Bit 43: decimal floating point facility is installed
 723          * translated to:
 724          *   HWCAP_S390_DFP bit 6.
 725          */
 726         if ((elf_hwcap & (1UL << 2)) &&
 727             __stfle(&facility_list_extended, 1) > 0) {
 728                 if (facility_list_extended & (1ULL << (64 - 43)))
 729                         elf_hwcap |= 1UL << 6;
 730         }
 731
 732         if (MACHINE_HAS_HPAGE)
 733                 elf_hwcap |= 1UL << 7;
 734
 735         switch (cpuinfo->cpu_id.machine) {
 736         case 0x9672:
 737 #if !defined(CONFIG_64BIT)
 738         default:        /* Use "g5" as default for 31 bit kernels. */
 739 #endif
 740                 strcpy(elf_platform, "g5");
 741                 break;
 742         case 0x2064:
 743         case 0x2066:
 744 #if defined(CONFIG_64BIT)
 745         default:        /* Use "z900" as default for 64 bit kernels. */
 746 #endif
 747                 strcpy(elf_platform, "z900");
 748                 break;
 749         case 0x2084:
 750         case 0x2086:
 751                 strcpy(elf_platform, "z990");
 752                 break;
 753         case 0x2094:
 754         case 0x2096:
 755                 strcpy(elf_platform, "z9-109");
 756                 break;
 757         case 0x2097:
 758         case 0x2098:
 759                 strcpy(elf_platform, "z10");
 760                 break;
 761         }
 762 }
 763
 764 /*
 765  * Setup function called from init/main.c just after the banner
 766  * was printed.
 767  */
 768
 769 void __init
 770 setup_arch(char **cmdline_p)
 771 {
 772         /* set up preferred console */
 773         add_preferred_console("ttyS", 0, NULL);
 774
 775         /*
 776          * print what head.S has found out about the machine
 777          */
 778 #ifndef CONFIG_64BIT
 779         if (MACHINE_IS_VM)
 780                 pr_info("Linux is running as a z/VM "
 781                         "guest operating system in 31-bit mode\n");
 782         else
 783                 pr_info("Linux is running natively in 31-bit mode\n");
 784         if (MACHINE_HAS_IEEE)
 785                 pr_info("The hardware system has IEEE compatible "
 786                         "floating point units\n");
 787         else
 788                 pr_info("The hardware system has no IEEE compatible "
 789                         "floating point units\n");
 790 #else /* CONFIG_64BIT */
 791         if (MACHINE_IS_VM)
 792                 pr_info("Linux is running as a z/VM "
 793                         "guest operating system in 64-bit mode\n");
 794         else if (MACHINE_IS_KVM) {
 795                 pr_info("Linux is running under KVM in 64-bit mode\n");
 796                 add_preferred_console("hvc", 0, NULL);
 797                 s390_virtio_console_init();
 798         } else
 799                 pr_info("Linux is running natively in 64-bit mode\n");
 800 #endif /* CONFIG_64BIT */
 801
 802         /* Have one command line that is parsed and saved in /proc/cmdline */
 803         /* boot_command_line has been already set up in early.c */
 804         *cmdline_p = boot_command_line;
 805
 806         ROOT_DEV = Root_RAM0;
 807
 808         init_mm.start_code = PAGE_OFFSET;
 809         init_mm.end_code = (unsigned long) &_etext;
 810         init_mm.end_data = (unsigned long) &_edata;
 811         init_mm.brk = (unsigned long) &_end;
 812
 813         if (MACHINE_HAS_MVCOS)
 814                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 815         else
 816                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 817
 818         parse_early_param();
 819
 820         setup_ipl();
 821         setup_memory_end();
 822         setup_addressing_mode();
 823         setup_memory();
 824         setup_resources();
 825         setup_lowcore();
 826
 827         cpu_init();
 828         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 829         s390_init_cpu_topology();
 830
 831         /*
 832          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 833          */
 834         setup_hwcaps();
 835
 836         /*
 837          * Create kernel page tables and switch to virtual addressing.
 838          */
 839         paging_init();
 840
 841         /* Setup default console */
 842         conmode_default();
 843
 844         /* Setup zfcpdump support */
 845         setup_zfcpdump(console_devno);
 846 }