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/ipl.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/system.h>
  47 #include <asm/smp.h>
  48 #include <asm/mmu_context.h>
  49 #include <asm/cpcmd.h>
  50 #include <asm/lowcore.h>
  51 #include <asm/irq.h>
  52 #include <asm/page.h>
  53 #include <asm/ptrace.h>
  54 #include <asm/sections.h>
  55 #include <asm/ebcdic.h>
  56 #include <asm/compat.h>
  57
  58 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  59                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  60 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  61                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  62                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  63
  64 /*
  65  * User copy operations.
  66  */
  67 struct uaccess_ops uaccess;
  68 EXPORT_SYMBOL_GPL(uaccess);
  69
  70 /*
  71  * Machine setup..
  72  */
  73 unsigned int console_mode = 0;
  74 unsigned int console_devno = -1;
  75 unsigned int console_irq = -1;
  76 unsigned long machine_flags = 0;
  77
  78 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  79 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  80 static unsigned long __initdata memory_end;
  81
  82 /*
  83  * This is set up by the setup-routine at boot-time
  84  * for S390 need to find out, what we have to setup
  85  * using address 0x10400 ...
  86  */
  87
  88 #include <asm/setup.h>
  89
  90 static struct resource code_resource = {
  91         .name  = "Kernel code",
  92         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  93 };
  94
  95 static struct resource data_resource = {
  96         .name = "Kernel data",
  97         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  98 };
  99
 100 /*
 101  * cpu_init() initializes state that is per-CPU.
 102  */
 103 void __devinit cpu_init (void)
 104 {
 105         int addr = hard_smp_processor_id();
 106
 107         /*
 108          * Store processor id in lowcore (used e.g. in timer_interrupt)
 109          */
 110         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 111         S390_lowcore.cpu_data.cpu_addr = addr;
 112
 113         /*
 114          * Force FPU initialization:
 115          */
 116         clear_thread_flag(TIF_USEDFPU);
 117         clear_used_math();
 118
 119         atomic_inc(&init_mm.mm_count);
 120         current->active_mm = &init_mm;
 121         if (current->mm)
 122                 BUG();
 123         enter_lazy_tlb(&init_mm, current);
 124 }
 125
 126 /*
 127  * VM halt and poweroff setup routines
 128  */
 129 char vmhalt_cmd[128] = "";
 130 char vmpoff_cmd[128] = "";
 131 static char vmpanic_cmd[128] = "";
 132
 133 static void strncpy_skip_quote(char *dst, char *src, int n)
 134 {
 135         int sx, dx;
 136
 137         dx = 0;
 138         for (sx = 0; src[sx] != 0; sx++) {
 139                 if (src[sx] == '"') continue;
 140                 dst[dx++] = src[sx];
 141                 if (dx >= n) break;
 142         }
 143 }
 144
 145 static int __init vmhalt_setup(char *str)
 146 {
 147         strncpy_skip_quote(vmhalt_cmd, str, 127);
 148         vmhalt_cmd[127] = 0;
 149         return 1;
 150 }
 151
 152 __setup("vmhalt=", vmhalt_setup);
 153
 154 static int __init vmpoff_setup(char *str)
 155 {
 156         strncpy_skip_quote(vmpoff_cmd, str, 127);
 157         vmpoff_cmd[127] = 0;
 158         return 1;
 159 }
 160
 161 __setup("vmpoff=", vmpoff_setup);
 162
 163 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 164                           void *data)
 165 {
 166         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 167                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 168
 169         return NOTIFY_OK;
 170 }
 171
 172 #define PANIC_PRI_VMPANIC       0
 173
 174 static struct notifier_block vmpanic_nb = {
 175         .notifier_call = vmpanic_notify,
 176         .priority = PANIC_PRI_VMPANIC
 177 };
 178
 179 static int __init vmpanic_setup(char *str)
 180 {
 181         static int register_done __initdata = 0;
 182
 183         strncpy_skip_quote(vmpanic_cmd, str, 127);
 184         vmpanic_cmd[127] = 0;
 185         if (!register_done) {
 186                 register_done = 1;
 187                 atomic_notifier_chain_register(&panic_notifier_list,
 188                                                &vmpanic_nb);
 189         }
 190         return 1;
 191 }
 192
 193 __setup("vmpanic=", vmpanic_setup);
 194
 195 /*
 196  * condev= and conmode= setup parameter.
 197  */
 198
 199 static int __init condev_setup(char *str)
 200 {
 201         int vdev;
 202
 203         vdev = simple_strtoul(str, &str, 0);
 204         if (vdev >= 0 && vdev < 65536) {
 205                 console_devno = vdev;
 206                 console_irq = -1;
 207         }
 208         return 1;
 209 }
 210
 211 __setup("condev=", condev_setup);
 212
 213 static int __init conmode_setup(char *str)
 214 {
 215 #if defined(CONFIG_SCLP_CONSOLE)
 216         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 217                 SET_CONSOLE_SCLP;
 218 #endif
 219 #if defined(CONFIG_TN3215_CONSOLE)
 220         if (strncmp(str, "3215", 5) == 0)
 221                 SET_CONSOLE_3215;
 222 #endif
 223 #if defined(CONFIG_TN3270_CONSOLE)
 224         if (strncmp(str, "3270", 5) == 0)
 225                 SET_CONSOLE_3270;
 226 #endif
 227         return 1;
 228 }
 229
 230 __setup("conmode=", conmode_setup);
 231
 232 static void __init conmode_default(void)
 233 {
 234         char query_buffer[1024];
 235         char *ptr;
 236
 237         if (MACHINE_IS_VM) {
 238                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 239                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 240                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 241                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 242                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 243                 ptr = strstr(query_buffer, "CONMODE");
 244                 /*
 245                  * Set the conmode to 3215 so that the device recognition
 246                  * will set the cu_type of the console to 3215. If the
 247                  * conmode is 3270 and we don't set it back then both
 248                  * 3215 and the 3270 driver will try to access the console
 249                  * device (3215 as console and 3270 as normal tty).
 250                  */
 251                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 252                 if (ptr == NULL) {
 253 #if defined(CONFIG_SCLP_CONSOLE)
 254                         SET_CONSOLE_SCLP;
 255 #endif
 256                         return;
 257                 }
 258                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 259 #if defined(CONFIG_TN3270_CONSOLE)
 260                         SET_CONSOLE_3270;
 261 #elif defined(CONFIG_TN3215_CONSOLE)
 262                         SET_CONSOLE_3215;
 263 #elif defined(CONFIG_SCLP_CONSOLE)
 264                         SET_CONSOLE_SCLP;
 265 #endif
 266                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 267 #if defined(CONFIG_TN3215_CONSOLE)
 268                         SET_CONSOLE_3215;
 269 #elif defined(CONFIG_TN3270_CONSOLE)
 270                         SET_CONSOLE_3270;
 271 #elif defined(CONFIG_SCLP_CONSOLE)
 272                         SET_CONSOLE_SCLP;
 273 #endif
 274                 }
 275         } else if (MACHINE_IS_P390) {
 276 #if defined(CONFIG_TN3215_CONSOLE)
 277                 SET_CONSOLE_3215;
 278 #elif defined(CONFIG_TN3270_CONSOLE)
 279                 SET_CONSOLE_3270;
 280 #endif
 281         } else {
 282 #if defined(CONFIG_SCLP_CONSOLE)
 283                 SET_CONSOLE_SCLP;
 284 #endif
 285         }
 286 }
 287
 288 #ifdef CONFIG_SMP
 289 void (*_machine_restart)(char *command) = machine_restart_smp;
 290 void (*_machine_halt)(void) = machine_halt_smp;
 291 void (*_machine_power_off)(void) = machine_power_off_smp;
 292 #else
 293 /*
 294  * Reboot, halt and power_off routines for non SMP.
 295  */
 296 static void do_machine_restart_nonsmp(char * __unused)
 297 {
 298         do_reipl();
 299 }
 300
 301 static void do_machine_halt_nonsmp(void)
 302 {
 303         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 304                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 305         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 306 }
 307
 308 static void do_machine_power_off_nonsmp(void)
 309 {
 310         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 311                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 312         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 313 }
 314
 315 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 316 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 317 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 318 #endif
 319
 320  /*
 321  * Reboot, halt and power_off stubs. They just call _machine_restart,
 322  * _machine_halt or _machine_power_off.
 323  */
 324
 325 void machine_restart(char *command)
 326 {
 327         if (!in_interrupt() || oops_in_progress)
 328                 /*
 329                  * Only unblank the console if we are called in enabled
 330                  * context or a bust_spinlocks cleared the way for us.
 331                  */
 332                 console_unblank();
 333         _machine_restart(command);
 334 }
 335
 336 void machine_halt(void)
 337 {
 338         if (!in_interrupt() || oops_in_progress)
 339                 /*
 340                  * Only unblank the console if we are called in enabled
 341                  * context or a bust_spinlocks cleared the way for us.
 342                  */
 343                 console_unblank();
 344         _machine_halt();
 345 }
 346
 347 void machine_power_off(void)
 348 {
 349         if (!in_interrupt() || oops_in_progress)
 350                 /*
 351                  * Only unblank the console if we are called in enabled
 352                  * context or a bust_spinlocks cleared the way for us.
 353                  */
 354                 console_unblank();
 355         _machine_power_off();
 356 }
 357
 358 /*
 359  * Dummy power off function.
 360  */
 361 void (*pm_power_off)(void) = machine_power_off;
 362
 363 static int __init early_parse_mem(char *p)
 364 {
 365         memory_end = memparse(p, &p);
 366         return 0;
 367 }
 368 early_param("mem", early_parse_mem);
 369
 370 /*
 371  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 372  */
 373 static int __init early_parse_ipldelay(char *p)
 374 {
 375         unsigned long delay = 0;
 376
 377         delay = simple_strtoul(p, &p, 0);
 378
 379         switch (*p) {
 380         case 's':
 381         case 'S':
 382                 delay *= 1000000;
 383                 break;
 384         case 'm':
 385         case 'M':
 386                 delay *= 60 * 1000000;
 387         }
 388
 389         /* now wait for the requested amount of time */
 390         udelay(delay);
 391
 392         return 0;
 393 }
 394 early_param("ipldelay", early_parse_ipldelay);
 395
 396 #ifdef CONFIG_S390_SWITCH_AMODE
 397 unsigned int switch_amode = 0;
 398 EXPORT_SYMBOL_GPL(switch_amode);
 399
 400 static void set_amode_and_uaccess(unsigned long user_amode,
 401                                   unsigned long user32_amode)
 402 {
 403         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 404                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 405                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 406 #ifdef CONFIG_COMPAT
 407         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 408                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 409                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 410         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 411                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 412                           PSW32_MASK_PSTATE;
 413 #endif
 414         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 415                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 416
 417         if (MACHINE_HAS_MVCOS) {
 418                 printk("mvcos available.\n");
 419                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 420         } else {
 421                 printk("mvcos not available.\n");
 422                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 423         }
 424 }
 425
 426 /*
 427  * Switch kernel/user addressing modes?
 428  */
 429 static int __init early_parse_switch_amode(char *p)
 430 {
 431         switch_amode = 1;
 432         return 0;
 433 }
 434 early_param("switch_amode", early_parse_switch_amode);
 435
 436 #else /* CONFIG_S390_SWITCH_AMODE */
 437 static inline void set_amode_and_uaccess(unsigned long user_amode,
 438                                          unsigned long user32_amode)
 439 {
 440 }
 441 #endif /* CONFIG_S390_SWITCH_AMODE */
 442
 443 #ifdef CONFIG_S390_EXEC_PROTECT
 444 unsigned int s390_noexec = 0;
 445 EXPORT_SYMBOL_GPL(s390_noexec);
 446
 447 /*
 448  * Enable execute protection?
 449  */
 450 static int __init early_parse_noexec(char *p)
 451 {
 452         if (!strncmp(p, "off", 3))
 453                 return 0;
 454         switch_amode = 1;
 455         s390_noexec = 1;
 456         return 0;
 457 }
 458 early_param("noexec", early_parse_noexec);
 459 #endif /* CONFIG_S390_EXEC_PROTECT */
 460
 461 static void setup_addressing_mode(void)
 462 {
 463         if (s390_noexec) {
 464                 printk("S390 execute protection active, ");
 465                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 466                 return;
 467         }
 468         if (switch_amode) {
 469                 printk("S390 address spaces switched, ");
 470                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 471         }
 472 }
 473
 474 static void __init
 475 setup_lowcore(void)
 476 {
 477         struct _lowcore *lc;
 478         int lc_pages;
 479
 480         /*
 481          * Setup lowcore for boot cpu
 482          */
 483         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 484         lc = (struct _lowcore *)
 485                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 486         memset(lc, 0, lc_pages * PAGE_SIZE);
 487         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 488         lc->restart_psw.addr =
 489                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 490         if (switch_amode)
 491                 lc->restart_psw.mask |= PSW_ASC_HOME;
 492         lc->external_new_psw.mask = psw_kernel_bits;
 493         lc->external_new_psw.addr =
 494                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 495         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 496         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 497         lc->program_new_psw.mask = psw_kernel_bits;
 498         lc->program_new_psw.addr =
 499                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 500         lc->mcck_new_psw.mask =
 501                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 502         lc->mcck_new_psw.addr =
 503                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 504         lc->io_new_psw.mask = psw_kernel_bits;
 505         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 506         lc->ipl_device = S390_lowcore.ipl_device;
 507         lc->jiffy_timer = -1LL;
 508         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 509         lc->async_stack = (unsigned long)
 510                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 511         lc->panic_stack = (unsigned long)
 512                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 513         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 514         lc->thread_info = (unsigned long) &init_thread_union;
 515 #ifndef CONFIG_64BIT
 516         if (MACHINE_HAS_IEEE) {
 517                 lc->extended_save_area_addr = (__u32)
 518                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 519                 /* enable extended save area */
 520                 __ctl_set_bit(14, 29);
 521         }
 522 #endif
 523         set_prefix((u32)(unsigned long) lc);
 524 }
 525
 526 static void __init
 527 setup_resources(void)
 528 {
 529         struct resource *res, *sub_res;
 530         int i;
 531
 532         code_resource.start = (unsigned long) &_text;
 533         code_resource.end = (unsigned long) &_etext - 1;
 534         data_resource.start = (unsigned long) &_etext;
 535         data_resource.end = (unsigned long) &_edata - 1;
 536
 537         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 538                 res = alloc_bootmem_low(sizeof(struct resource));
 539                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 540                 switch (memory_chunk[i].type) {
 541                 case CHUNK_READ_WRITE:
 542                         res->name = "System RAM";
 543                         break;
 544                 case CHUNK_READ_ONLY:
 545                         res->name = "System ROM";
 546                         res->flags |= IORESOURCE_READONLY;
 547                         break;
 548                 default:
 549                         res->name = "reserved";
 550                 }
 551                 res->start = memory_chunk[i].addr;
 552                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 553                 request_resource(&iomem_resource, res);
 554
 555                 if (code_resource.start >= res->start  &&
 556                         code_resource.start <= res->end &&
 557                         code_resource.end > res->end) {
 558                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 559                         memcpy(sub_res, &code_resource,
 560                                 sizeof(struct resource));
 561                         sub_res->end = res->end;
 562                         code_resource.start = res->end + 1;
 563                         request_resource(res, sub_res);
 564                 }
 565
 566                 if (code_resource.start >= res->start &&
 567                         code_resource.start <= res->end &&
 568                         code_resource.end <= res->end)
 569                         request_resource(res, &code_resource);
 570
 571                 if (data_resource.start >= res->start &&
 572                         data_resource.start <= res->end &&
 573                         data_resource.end > res->end) {
 574                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 575                         memcpy(sub_res, &data_resource,
 576                                 sizeof(struct resource));
 577                         sub_res->end = res->end;
 578                         data_resource.start = res->end + 1;
 579                         request_resource(res, sub_res);
 580                 }
 581
 582                 if (data_resource.start >= res->start &&
 583                         data_resource.start <= res->end &&
 584                         data_resource.end <= res->end)
 585                         request_resource(res, &data_resource);
 586         }
 587 }
 588
 589 static void __init setup_memory_end(void)
 590 {
 591         unsigned long real_size, memory_size;
 592         unsigned long max_mem, max_phys;
 593         int i;
 594
 595         memory_size = real_size = 0;
 596         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 597         memory_end &= PAGE_MASK;
 598
 599         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 600
 601         for (i = 0; i < MEMORY_CHUNKS; i++) {
 602                 struct mem_chunk *chunk = &memory_chunk[i];
 603
 604                 real_size = max(real_size, chunk->addr + chunk->size);
 605                 if (chunk->addr >= max_mem) {
 606                         memset(chunk, 0, sizeof(*chunk));
 607                         continue;
 608                 }
 609                 if (chunk->addr + chunk->size > max_mem)
 610                         chunk->size = max_mem - chunk->addr;
 611                 memory_size = max(memory_size, chunk->addr + chunk->size);
 612         }
 613         if (!memory_end)
 614                 memory_end = memory_size;
 615 }
 616
 617 static void __init
 618 setup_memory(void)
 619 {
 620         unsigned long bootmap_size;
 621         unsigned long start_pfn, end_pfn;
 622         int i;
 623
 624         /*
 625          * partially used pages are not usable - thus
 626          * we are rounding upwards:
 627          */
 628         start_pfn = PFN_UP(__pa(&_end));
 629         end_pfn = max_pfn = PFN_DOWN(memory_end);
 630
 631 #ifdef CONFIG_BLK_DEV_INITRD
 632         /*
 633          * Move the initrd in case the bitmap of the bootmem allocater
 634          * would overwrite it.
 635          */
 636
 637         if (INITRD_START && INITRD_SIZE) {
 638                 unsigned long bmap_size;
 639                 unsigned long start;
 640
 641                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 642                 bmap_size = PFN_PHYS(bmap_size);
 643
 644                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 645                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 646
 647                         if (start + INITRD_SIZE > memory_end) {
 648                                 printk("initrd extends beyond end of memory "
 649                                        "(0x%08lx > 0x%08lx)\n"
 650                                        "disabling initrd\n",
 651                                        start + INITRD_SIZE, memory_end);
 652                                 INITRD_START = INITRD_SIZE = 0;
 653                         } else {
 654                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 655                                        "size: %ld)\n",
 656                                        INITRD_START, start, INITRD_SIZE);
 657                                 memmove((void *) start, (void *) INITRD_START,
 658                                         INITRD_SIZE);
 659                                 INITRD_START = start;
 660                         }
 661                 }
 662         }
 663 #endif
 664
 665         /*
 666          * Initialize the boot-time allocator
 667          */
 668         bootmap_size = init_bootmem(start_pfn, end_pfn);
 669
 670         /*
 671          * Register RAM areas with the bootmem allocator.
 672          */
 673
 674         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 675                 unsigned long start_chunk, end_chunk, pfn;
 676
 677                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 678                         continue;
 679                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 680                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 681                 end_chunk = min(end_chunk, end_pfn);
 682                 if (start_chunk >= end_chunk)
 683                         continue;
 684                 add_active_range(0, start_chunk, end_chunk);
 685                 pfn = max(start_chunk, start_pfn);
 686                 for (; pfn <= end_chunk; pfn++)
 687                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 688         }
 689
 690         psw_set_key(PAGE_DEFAULT_KEY);
 691
 692         free_bootmem_with_active_regions(0, max_pfn);
 693
 694         /*
 695          * Reserve memory used for lowcore/command line/kernel image.
 696          */
 697         reserve_bootmem(0, (unsigned long)_ehead);
 698         reserve_bootmem((unsigned long)_stext,
 699                         PFN_PHYS(start_pfn) - (unsigned long)_stext);
 700         /*
 701          * Reserve the bootmem bitmap itself as well. We do this in two
 702          * steps (first step was init_bootmem()) because this catches
 703          * the (very unlikely) case of us accidentally initializing the
 704          * bootmem allocator with an invalid RAM area.
 705          */
 706         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 707
 708 #ifdef CONFIG_BLK_DEV_INITRD
 709         if (INITRD_START && INITRD_SIZE) {
 710                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 711                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 712                         initrd_start = INITRD_START;
 713                         initrd_end = initrd_start + INITRD_SIZE;
 714                 } else {
 715                         printk("initrd extends beyond end of memory "
 716                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 717                                initrd_start + INITRD_SIZE, memory_end);
 718                         initrd_start = initrd_end = 0;
 719                 }
 720         }
 721 #endif
 722 }
 723
 724 /*
 725  * Setup function called from init/main.c just after the banner
 726  * was printed.
 727  */
 728
 729 void __init
 730 setup_arch(char **cmdline_p)
 731 {
 732         /*
 733          * print what head.S has found out about the machine
 734          */
 735 #ifndef CONFIG_64BIT
 736         printk((MACHINE_IS_VM) ?
 737                "We are running under VM (31 bit mode)\n" :
 738                "We are running native (31 bit mode)\n");
 739         printk((MACHINE_HAS_IEEE) ?
 740                "This machine has an IEEE fpu\n" :
 741                "This machine has no IEEE fpu\n");
 742 #else /* CONFIG_64BIT */
 743         printk((MACHINE_IS_VM) ?
 744                "We are running under VM (64 bit mode)\n" :
 745                "We are running native (64 bit mode)\n");
 746 #endif /* CONFIG_64BIT */
 747
 748         /* Save unparsed command line copy for /proc/cmdline */
 749         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 750
 751         *cmdline_p = COMMAND_LINE;
 752         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 753
 754         ROOT_DEV = Root_RAM0;
 755
 756         init_mm.start_code = PAGE_OFFSET;
 757         init_mm.end_code = (unsigned long) &_etext;
 758         init_mm.end_data = (unsigned long) &_edata;
 759         init_mm.brk = (unsigned long) &_end;
 760
 761         if (MACHINE_HAS_MVCOS)
 762                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 763         else
 764                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 765
 766         parse_early_param();
 767
 768         setup_memory_end();
 769         setup_addressing_mode();
 770         setup_memory();
 771         setup_resources();
 772         setup_lowcore();
 773
 774         cpu_init();
 775         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 776         smp_setup_cpu_possible_map();
 777
 778         /*
 779          * Create kernel page tables and switch to virtual addressing.
 780          */
 781         paging_init();
 782
 783         /* Setup default console */
 784         conmode_default();
 785 }
 786
 787 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 788 {
 789    printk("cpu %d "
 790 #ifdef CONFIG_SMP
 791            "phys_idx=%d "
 792 #endif
 793            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 794            cpuinfo->cpu_nr,
 795 #ifdef CONFIG_SMP
 796            cpuinfo->cpu_addr,
 797 #endif
 798            cpuinfo->cpu_id.version,
 799            cpuinfo->cpu_id.ident,
 800            cpuinfo->cpu_id.machine,
 801            cpuinfo->cpu_id.unused);
 802 }
 803
 804 /*
 805  * show_cpuinfo - Get information on one CPU for use by procfs.
 806  */
 807
 808 static int show_cpuinfo(struct seq_file *m, void *v)
 809 {
 810         struct cpuinfo_S390 *cpuinfo;
 811         unsigned long n = (unsigned long) v - 1;
 812
 813         s390_adjust_jiffies();
 814         preempt_disable();
 815         if (!n) {
 816                 seq_printf(m, "vendor_id       : IBM/S390\n"
 817                                "# processors    : %i\n"
 818                                "bogomips per cpu: %lu.%02lu\n",
 819                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 820                                (loops_per_jiffy/(5000/HZ))%100);
 821         }
 822         if (cpu_online(n)) {
 823 #ifdef CONFIG_SMP
 824                 if (smp_processor_id() == n)
 825                         cpuinfo = &S390_lowcore.cpu_data;
 826                 else
 827                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 828 #else
 829                 cpuinfo = &S390_lowcore.cpu_data;
 830 #endif
 831                 seq_printf(m, "processor %li: "
 832                                "version = %02X,  "
 833                                "identification = %06X,  "
 834                                "machine = %04X\n",
 835                                n, cpuinfo->cpu_id.version,
 836                                cpuinfo->cpu_id.ident,
 837                                cpuinfo->cpu_id.machine);
 838         }
 839         preempt_enable();
 840         return 0;
 841 }
 842
 843 static void *c_start(struct seq_file *m, loff_t *pos)
 844 {
 845         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 846 }
 847 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 848 {
 849         ++*pos;
 850         return c_start(m, pos);
 851 }
 852 static void c_stop(struct seq_file *m, void *v)
 853 {
 854 }
 855 struct seq_operations cpuinfo_op = {
 856         .start  = c_start,
 857         .next   = c_next,
 858         .stop   = c_stop,
 859         .show   = show_cpuinfo,
 860 };
 861