arch/s390/kernel/setup.c

   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 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/root_dev.h>
  35 #include <linux/console.h>
  36 #include <linux/seq_file.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
  44 #include <asm/uaccess.h>
  45 #include <asm/system.h>
  46 #include <asm/smp.h>
  47 #include <asm/mmu_context.h>
  48 #include <asm/cpcmd.h>
  49 #include <asm/lowcore.h>
  50 #include <asm/irq.h>
  51 #include <asm/page.h>
  52 #include <asm/ptrace.h>
  53 #include <asm/sections.h>
  54 #include <asm/ebcdic.h>
  55 #include <asm/compat.h>
  56
  57 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  58                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  59 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  60                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  61                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  62
  63 /*
  64  * User copy operations.
  65  */
  66 struct uaccess_ops uaccess;
  67 EXPORT_SYMBOL_GPL(uaccess);
  68
  69 /*
  70  * Machine setup..
  71  */
  72 unsigned int console_mode = 0;
  73 unsigned int console_devno = -1;
  74 unsigned int console_irq = -1;
  75 unsigned long machine_flags = 0;
  76
  77 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  78 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  79 static unsigned long __initdata memory_end;
  80
  81 /*
  82  * This is set up by the setup-routine at boot-time
  83  * for S390 need to find out, what we have to setup
  84  * using address 0x10400 ...
  85  */
  86
  87 #include <asm/setup.h>
  88
  89 static struct resource code_resource = {
  90         .name  = "Kernel code",
  91         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  92 };
  93
  94 static struct resource data_resource = {
  95         .name = "Kernel data",
  96         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  97 };
  98
  99 /*
 100  * cpu_init() initializes state that is per-CPU.
 101  */
 102 void __devinit cpu_init (void)
 103 {
 104         int addr = hard_smp_processor_id();
 105
 106         /*
 107          * Store processor id in lowcore (used e.g. in timer_interrupt)
 108          */
 109         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 110         S390_lowcore.cpu_data.cpu_addr = addr;
 111
 112         /*
 113          * Force FPU initialization:
 114          */
 115         clear_thread_flag(TIF_USEDFPU);
 116         clear_used_math();
 117
 118         atomic_inc(&init_mm.mm_count);
 119         current->active_mm = &init_mm;
 120         if (current->mm)
 121                 BUG();
 122         enter_lazy_tlb(&init_mm, current);
 123 }
 124
 125 /*
 126  * VM halt and poweroff setup routines
 127  */
 128 char vmhalt_cmd[128] = "";
 129 char vmpoff_cmd[128] = "";
 130 static char vmpanic_cmd[128] = "";
 131
 132 static void strncpy_skip_quote(char *dst, char *src, int n)
 133 {
 134         int sx, dx;
 135
 136         dx = 0;
 137         for (sx = 0; src[sx] != 0; sx++) {
 138                 if (src[sx] == '"') continue;
 139                 dst[dx++] = src[sx];
 140                 if (dx >= n) break;
 141         }
 142 }
 143
 144 static int __init vmhalt_setup(char *str)
 145 {
 146         strncpy_skip_quote(vmhalt_cmd, str, 127);
 147         vmhalt_cmd[127] = 0;
 148         return 1;
 149 }
 150
 151 __setup("vmhalt=", vmhalt_setup);
 152
 153 static int __init vmpoff_setup(char *str)
 154 {
 155         strncpy_skip_quote(vmpoff_cmd, str, 127);
 156         vmpoff_cmd[127] = 0;
 157         return 1;
 158 }
 159
 160 __setup("vmpoff=", vmpoff_setup);
 161
 162 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 163                           void *data)
 164 {
 165         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 166                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 167
 168         return NOTIFY_OK;
 169 }
 170
 171 #define PANIC_PRI_VMPANIC       0
 172
 173 static struct notifier_block vmpanic_nb = {
 174         .notifier_call = vmpanic_notify,
 175         .priority = PANIC_PRI_VMPANIC
 176 };
 177
 178 static int __init vmpanic_setup(char *str)
 179 {
 180         static int register_done __initdata = 0;
 181
 182         strncpy_skip_quote(vmpanic_cmd, str, 127);
 183         vmpanic_cmd[127] = 0;
 184         if (!register_done) {
 185                 register_done = 1;
 186                 atomic_notifier_chain_register(&panic_notifier_list,
 187                                                &vmpanic_nb);
 188         }
 189         return 1;
 190 }
 191
 192 __setup("vmpanic=", vmpanic_setup);
 193
 194 /*
 195  * condev= and conmode= setup parameter.
 196  */
 197
 198 static int __init condev_setup(char *str)
 199 {
 200         int vdev;
 201
 202         vdev = simple_strtoul(str, &str, 0);
 203         if (vdev >= 0 && vdev < 65536) {
 204                 console_devno = vdev;
 205                 console_irq = -1;
 206         }
 207         return 1;
 208 }
 209
 210 __setup("condev=", condev_setup);
 211
 212 static int __init conmode_setup(char *str)
 213 {
 214 #if defined(CONFIG_SCLP_CONSOLE)
 215         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 216                 SET_CONSOLE_SCLP;
 217 #endif
 218 #if defined(CONFIG_TN3215_CONSOLE)
 219         if (strncmp(str, "3215", 5) == 0)
 220                 SET_CONSOLE_3215;
 221 #endif
 222 #if defined(CONFIG_TN3270_CONSOLE)
 223         if (strncmp(str, "3270", 5) == 0)
 224                 SET_CONSOLE_3270;
 225 #endif
 226         return 1;
 227 }
 228
 229 __setup("conmode=", conmode_setup);
 230
 231 static void __init conmode_default(void)
 232 {
 233         char query_buffer[1024];
 234         char *ptr;
 235
 236         if (MACHINE_IS_VM) {
 237                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 238                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 239                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 240                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 241                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 242                 ptr = strstr(query_buffer, "CONMODE");
 243                 /*
 244                  * Set the conmode to 3215 so that the device recognition
 245                  * will set the cu_type of the console to 3215. If the
 246                  * conmode is 3270 and we don't set it back then both
 247                  * 3215 and the 3270 driver will try to access the console
 248                  * device (3215 as console and 3270 as normal tty).
 249                  */
 250                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 251                 if (ptr == NULL) {
 252 #if defined(CONFIG_SCLP_CONSOLE)
 253                         SET_CONSOLE_SCLP;
 254 #endif
 255                         return;
 256                 }
 257                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 258 #if defined(CONFIG_TN3270_CONSOLE)
 259                         SET_CONSOLE_3270;
 260 #elif defined(CONFIG_TN3215_CONSOLE)
 261                         SET_CONSOLE_3215;
 262 #elif defined(CONFIG_SCLP_CONSOLE)
 263                         SET_CONSOLE_SCLP;
 264 #endif
 265                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 266 #if defined(CONFIG_TN3215_CONSOLE)
 267                         SET_CONSOLE_3215;
 268 #elif defined(CONFIG_TN3270_CONSOLE)
 269                         SET_CONSOLE_3270;
 270 #elif defined(CONFIG_SCLP_CONSOLE)
 271                         SET_CONSOLE_SCLP;
 272 #endif
 273                 }
 274         } else if (MACHINE_IS_P390) {
 275 #if defined(CONFIG_TN3215_CONSOLE)
 276                 SET_CONSOLE_3215;
 277 #elif defined(CONFIG_TN3270_CONSOLE)
 278                 SET_CONSOLE_3270;
 279 #endif
 280         } else {
 281 #if defined(CONFIG_SCLP_CONSOLE)
 282                 SET_CONSOLE_SCLP;
 283 #endif
 284         }
 285 }
 286
 287 #ifdef CONFIG_SMP
 288 void (*_machine_restart)(char *command) = machine_restart_smp;
 289 void (*_machine_halt)(void) = machine_halt_smp;
 290 void (*_machine_power_off)(void) = machine_power_off_smp;
 291 #else
 292 /*
 293  * Reboot, halt and power_off routines for non SMP.
 294  */
 295 static void do_machine_restart_nonsmp(char * __unused)
 296 {
 297         do_reipl();
 298 }
 299
 300 static void do_machine_halt_nonsmp(void)
 301 {
 302         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 303                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 304         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 305 }
 306
 307 static void do_machine_power_off_nonsmp(void)
 308 {
 309         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 310                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 311         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 312 }
 313
 314 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 315 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 316 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 317 #endif
 318
 319  /*
 320  * Reboot, halt and power_off stubs. They just call _machine_restart,
 321  * _machine_halt or _machine_power_off.
 322  */
 323
 324 void machine_restart(char *command)
 325 {
 326         if (!in_interrupt() || oops_in_progress)
 327                 /*
 328                  * Only unblank the console if we are called in enabled
 329                  * context or a bust_spinlocks cleared the way for us.
 330                  */
 331                 console_unblank();
 332         _machine_restart(command);
 333 }
 334
 335 void machine_halt(void)
 336 {
 337         if (!in_interrupt() || oops_in_progress)
 338                 /*
 339                  * Only unblank the console if we are called in enabled
 340                  * context or a bust_spinlocks cleared the way for us.
 341                  */
 342                 console_unblank();
 343         _machine_halt();
 344 }
 345
 346 void machine_power_off(void)
 347 {
 348         if (!in_interrupt() || oops_in_progress)
 349                 /*
 350                  * Only unblank the console if we are called in enabled
 351                  * context or a bust_spinlocks cleared the way for us.
 352                  */
 353                 console_unblank();
 354         _machine_power_off();
 355 }
 356
 357 /*
 358  * Dummy power off function.
 359  */
 360 void (*pm_power_off)(void) = machine_power_off;
 361
 362 static int __init early_parse_mem(char *p)
 363 {
 364         memory_end = memparse(p, &p);
 365         return 0;
 366 }
 367 early_param("mem", early_parse_mem);
 368
 369 /*
 370  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 371  */
 372 static int __init early_parse_ipldelay(char *p)
 373 {
 374         unsigned long delay = 0;
 375
 376         delay = simple_strtoul(p, &p, 0);
 377
 378         switch (*p) {
 379         case 's':
 380         case 'S':
 381                 delay *= 1000000;
 382                 break;
 383         case 'm':
 384         case 'M':
 385                 delay *= 60 * 1000000;
 386         }
 387
 388         /* now wait for the requested amount of time */
 389         udelay(delay);
 390
 391         return 0;
 392 }
 393 early_param("ipldelay", early_parse_ipldelay);
 394
 395 #ifdef CONFIG_S390_SWITCH_AMODE
 396 unsigned int switch_amode = 0;
 397 EXPORT_SYMBOL_GPL(switch_amode);
 398
 399 static void set_amode_and_uaccess(unsigned long user_amode,
 400                                   unsigned long user32_amode)
 401 {
 402         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 403                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 404                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 405 #ifdef CONFIG_COMPAT
 406         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 407                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 408                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 409         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 410                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 411                           PSW32_MASK_PSTATE;
 412 #endif
 413         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 414                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 415
 416         if (MACHINE_HAS_MVCOS) {
 417                 printk("mvcos available.\n");
 418                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 419         } else {
 420                 printk("mvcos not available.\n");
 421                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 422         }
 423 }
 424
 425 /*
 426  * Switch kernel/user addressing modes?
 427  */
 428 static int __init early_parse_switch_amode(char *p)
 429 {
 430         switch_amode = 1;
 431         return 0;
 432 }
 433 early_param("switch_amode", early_parse_switch_amode);
 434
 435 #else /* CONFIG_S390_SWITCH_AMODE */
 436 static inline void set_amode_and_uaccess(unsigned long user_amode,
 437                                          unsigned long user32_amode)
 438 {
 439 }
 440 #endif /* CONFIG_S390_SWITCH_AMODE */
 441
 442 #ifdef CONFIG_S390_EXEC_PROTECT
 443 unsigned int s390_noexec = 0;
 444 EXPORT_SYMBOL_GPL(s390_noexec);
 445
 446 /*
 447  * Enable execute protection?
 448  */
 449 static int __init early_parse_noexec(char *p)
 450 {
 451         if (!strncmp(p, "off", 3))
 452                 return 0;
 453         switch_amode = 1;
 454         s390_noexec = 1;
 455         return 0;
 456 }
 457 early_param("noexec", early_parse_noexec);
 458 #endif /* CONFIG_S390_EXEC_PROTECT */
 459
 460 static void setup_addressing_mode(void)
 461 {
 462         if (s390_noexec) {
 463                 printk("S390 execute protection active, ");
 464                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 465                 return;
 466         }
 467         if (switch_amode) {
 468                 printk("S390 address spaces switched, ");
 469                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 470         }
 471 }
 472
 473 static void __init
 474 setup_lowcore(void)
 475 {
 476         struct _lowcore *lc;
 477         int lc_pages;
 478
 479         /*
 480          * Setup lowcore for boot cpu
 481          */
 482         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 483         lc = (struct _lowcore *)
 484                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 485         memset(lc, 0, lc_pages * PAGE_SIZE);
 486         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 487         lc->restart_psw.addr =
 488                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 489         if (switch_amode)
 490                 lc->restart_psw.mask |= PSW_ASC_HOME;
 491         lc->external_new_psw.mask = psw_kernel_bits;
 492         lc->external_new_psw.addr =
 493                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 494         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 495         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 496         lc->program_new_psw.mask = psw_kernel_bits;
 497         lc->program_new_psw.addr =
 498                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 499         lc->mcck_new_psw.mask =
 500                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 501         lc->mcck_new_psw.addr =
 502                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 503         lc->io_new_psw.mask = psw_kernel_bits;
 504         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 505         lc->ipl_device = S390_lowcore.ipl_device;
 506         lc->jiffy_timer = -1LL;
 507         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 508         lc->async_stack = (unsigned long)
 509                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 510         lc->panic_stack = (unsigned long)
 511                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 512         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 513         lc->thread_info = (unsigned long) &init_thread_union;
 514 #ifndef CONFIG_64BIT
 515         if (MACHINE_HAS_IEEE) {
 516                 lc->extended_save_area_addr = (__u32)
 517                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 518                 /* enable extended save area */
 519                 __ctl_set_bit(14, 29);
 520         }
 521 #endif
 522         set_prefix((u32)(unsigned long) lc);
 523 }
 524
 525 static void __init
 526 setup_resources(void)
 527 {
 528         struct resource *res, *sub_res;
 529         int i;
 530
 531         code_resource.start = (unsigned long) &_text;
 532         code_resource.end = (unsigned long) &_etext - 1;
 533         data_resource.start = (unsigned long) &_etext;
 534         data_resource.end = (unsigned long) &_edata - 1;
 535
 536         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 537                 res = alloc_bootmem_low(sizeof(struct resource));
 538                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 539                 switch (memory_chunk[i].type) {
 540                 case CHUNK_READ_WRITE:
 541                         res->name = "System RAM";
 542                         break;
 543                 case CHUNK_READ_ONLY:
 544                         res->name = "System ROM";
 545                         res->flags |= IORESOURCE_READONLY;
 546                         break;
 547                 default:
 548                         res->name = "reserved";
 549                 }
 550                 res->start = memory_chunk[i].addr;
 551                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 552                 request_resource(&iomem_resource, res);
 553
 554                 if (code_resource.start >= res->start  &&
 555                         code_resource.start <= res->end &&
 556                         code_resource.end > res->end) {
 557                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 558                         memcpy(sub_res, &code_resource,
 559                                 sizeof(struct resource));
 560                         sub_res->end = res->end;
 561                         code_resource.start = res->end + 1;
 562                         request_resource(res, sub_res);
 563                 }
 564
 565                 if (code_resource.start >= res->start &&
 566                         code_resource.start <= res->end &&
 567                         code_resource.end <= res->end)
 568                         request_resource(res, &code_resource);
 569
 570                 if (data_resource.start >= res->start &&
 571                         data_resource.start <= res->end &&
 572                         data_resource.end > res->end) {
 573                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 574                         memcpy(sub_res, &data_resource,
 575                                 sizeof(struct resource));
 576                         sub_res->end = res->end;
 577                         data_resource.start = res->end + 1;
 578                         request_resource(res, sub_res);
 579                 }
 580
 581                 if (data_resource.start >= res->start &&
 582                         data_resource.start <= res->end &&
 583                         data_resource.end <= res->end)
 584                         request_resource(res, &data_resource);
 585         }
 586 }
 587
 588 static void __init setup_memory_end(void)
 589 {
 590         unsigned long real_size, memory_size;
 591         unsigned long max_mem, max_phys;
 592         int i;
 593
 594         memory_size = real_size = 0;
 595         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 596         memory_end &= PAGE_MASK;
 597
 598         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 599
 600         for (i = 0; i < MEMORY_CHUNKS; i++) {
 601                 struct mem_chunk *chunk = &memory_chunk[i];
 602
 603                 real_size = max(real_size, chunk->addr + chunk->size);
 604                 if (chunk->addr >= max_mem) {
 605                         memset(chunk, 0, sizeof(*chunk));
 606                         continue;
 607                 }
 608                 if (chunk->addr + chunk->size > max_mem)
 609                         chunk->size = max_mem - chunk->addr;
 610                 memory_size = max(memory_size, chunk->addr + chunk->size);
 611         }
 612         if (!memory_end)
 613                 memory_end = memory_size;
 614 }
 615
 616 static void __init
 617 setup_memory(void)
 618 {
 619         unsigned long bootmap_size;
 620         unsigned long start_pfn, end_pfn;
 621         int i;
 622
 623         /*
 624          * partially used pages are not usable - thus
 625          * we are rounding upwards:
 626          */
 627         start_pfn = PFN_UP(__pa(&_end));
 628         end_pfn = max_pfn = PFN_DOWN(memory_end);
 629
 630 #ifdef CONFIG_BLK_DEV_INITRD
 631         /*
 632          * Move the initrd in case the bitmap of the bootmem allocater
 633          * would overwrite it.
 634          */
 635
 636         if (INITRD_START && INITRD_SIZE) {
 637                 unsigned long bmap_size;
 638                 unsigned long start;
 639
 640                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 641                 bmap_size = PFN_PHYS(bmap_size);
 642
 643                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 644                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 645
 646                         if (start + INITRD_SIZE > memory_end) {
 647                                 printk("initrd extends beyond end of memory "
 648                                        "(0x%08lx > 0x%08lx)\n"
 649                                        "disabling initrd\n",
 650                                        start + INITRD_SIZE, memory_end);
 651                                 INITRD_START = INITRD_SIZE = 0;
 652                         } else {
 653                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 654                                        "size: %ld)\n",
 655                                        INITRD_START, start, INITRD_SIZE);
 656                                 memmove((void *) start, (void *) INITRD_START,
 657                                         INITRD_SIZE);
 658                                 INITRD_START = start;
 659                         }
 660                 }
 661         }
 662 #endif
 663
 664         /*
 665          * Initialize the boot-time allocator
 666          */
 667         bootmap_size = init_bootmem(start_pfn, end_pfn);
 668
 669         /*
 670          * Register RAM areas with the bootmem allocator.
 671          */
 672
 673         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 674                 unsigned long start_chunk, end_chunk, pfn;
 675
 676                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 677                         continue;
 678                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 679                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 680                 end_chunk = min(end_chunk, end_pfn);
 681                 if (start_chunk >= end_chunk)
 682                         continue;
 683                 add_active_range(0, start_chunk, end_chunk);
 684                 pfn = max(start_chunk, start_pfn);
 685                 for (; pfn <= end_chunk; pfn++)
 686                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 687         }
 688
 689         psw_set_key(PAGE_DEFAULT_KEY);
 690
 691         free_bootmem_with_active_regions(0, max_pfn);
 692         reserve_bootmem(0, PFN_PHYS(start_pfn));
 693
 694         /*
 695          * Reserve the bootmem bitmap itself as well. We do this in two
 696          * steps (first step was init_bootmem()) because this catches
 697          * the (very unlikely) case of us accidentally initializing the
 698          * bootmem allocator with an invalid RAM area.
 699          */
 700         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 701
 702 #ifdef CONFIG_BLK_DEV_INITRD
 703         if (INITRD_START && INITRD_SIZE) {
 704                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 705                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 706                         initrd_start = INITRD_START;
 707                         initrd_end = initrd_start + INITRD_SIZE;
 708                 } else {
 709                         printk("initrd extends beyond end of memory "
 710                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 711                                initrd_start + INITRD_SIZE, memory_end);
 712                         initrd_start = initrd_end = 0;
 713                 }
 714         }
 715 #endif
 716 }
 717
 718 /*
 719  * Setup function called from init/main.c just after the banner
 720  * was printed.
 721  */
 722
 723 void __init
 724 setup_arch(char **cmdline_p)
 725 {
 726         /*
 727          * print what head.S has found out about the machine
 728          */
 729 #ifndef CONFIG_64BIT
 730         printk((MACHINE_IS_VM) ?
 731                "We are running under VM (31 bit mode)\n" :
 732                "We are running native (31 bit mode)\n");
 733         printk((MACHINE_HAS_IEEE) ?
 734                "This machine has an IEEE fpu\n" :
 735                "This machine has no IEEE fpu\n");
 736 #else /* CONFIG_64BIT */
 737         printk((MACHINE_IS_VM) ?
 738                "We are running under VM (64 bit mode)\n" :
 739                "We are running native (64 bit mode)\n");
 740 #endif /* CONFIG_64BIT */
 741
 742         /* Save unparsed command line copy for /proc/cmdline */
 743         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 744
 745         *cmdline_p = COMMAND_LINE;
 746         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 747
 748         ROOT_DEV = Root_RAM0;
 749
 750         init_mm.start_code = PAGE_OFFSET;
 751         init_mm.end_code = (unsigned long) &_etext;
 752         init_mm.end_data = (unsigned long) &_edata;
 753         init_mm.brk = (unsigned long) &_end;
 754
 755         if (MACHINE_HAS_MVCOS)
 756                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 757         else
 758                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 759
 760         parse_early_param();
 761
 762         setup_memory_end();
 763         setup_addressing_mode();
 764         setup_memory();
 765         setup_resources();
 766         setup_lowcore();
 767
 768         cpu_init();
 769         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 770         smp_setup_cpu_possible_map();
 771
 772         /*
 773          * Create kernel page tables and switch to virtual addressing.
 774          */
 775         paging_init();
 776
 777         /* Setup default console */
 778         conmode_default();
 779 }
 780
 781 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 782 {
 783    printk("cpu %d "
 784 #ifdef CONFIG_SMP
 785            "phys_idx=%d "
 786 #endif
 787            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 788            cpuinfo->cpu_nr,
 789 #ifdef CONFIG_SMP
 790            cpuinfo->cpu_addr,
 791 #endif
 792            cpuinfo->cpu_id.version,
 793            cpuinfo->cpu_id.ident,
 794            cpuinfo->cpu_id.machine,
 795            cpuinfo->cpu_id.unused);
 796 }
 797
 798 /*
 799  * show_cpuinfo - Get information on one CPU for use by procfs.
 800  */
 801
 802 static int show_cpuinfo(struct seq_file *m, void *v)
 803 {
 804         struct cpuinfo_S390 *cpuinfo;
 805         unsigned long n = (unsigned long) v - 1;
 806
 807         s390_adjust_jiffies();
 808         preempt_disable();
 809         if (!n) {
 810                 seq_printf(m, "vendor_id       : IBM/S390\n"
 811                                "# processors    : %i\n"
 812                                "bogomips per cpu: %lu.%02lu\n",
 813                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 814                                (loops_per_jiffy/(5000/HZ))%100);
 815         }
 816         if (cpu_online(n)) {
 817 #ifdef CONFIG_SMP
 818                 if (smp_processor_id() == n)
 819                         cpuinfo = &S390_lowcore.cpu_data;
 820                 else
 821                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 822 #else
 823                 cpuinfo = &S390_lowcore.cpu_data;
 824 #endif
 825                 seq_printf(m, "processor %li: "
 826                                "version = %02X,  "
 827                                "identification = %06X,  "
 828                                "machine = %04X\n",
 829                                n, cpuinfo->cpu_id.version,
 830                                cpuinfo->cpu_id.ident,
 831                                cpuinfo->cpu_id.machine);
 832         }
 833         preempt_enable();
 834         return 0;
 835 }
 836
 837 static void *c_start(struct seq_file *m, loff_t *pos)
 838 {
 839         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 840 }
 841 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 842 {
 843         ++*pos;
 844         return c_start(m, pos);
 845 }
 846 static void c_stop(struct seq_file *m, void *v)
 847 {
 848 }
 849 struct seq_operations cpuinfo_op = {
 850         .start  = c_start,
 851         .next   = c_next,
 852         .stop   = c_stop,
 853         .show   = show_cpuinfo,
 854 };
 855