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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 #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(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 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 289 static void __init setup_zfcpdump(unsigned int console_devno)
 290 {
 291         static char str[64];
 292
 293         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 294                 return;
 295         if (console_devno != -1)
 296                 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
 297                         ipl_info.data.fcp.dev_id.devno, console_devno);
 298         else
 299                 sprintf(str, "cio_ignore=all,!0.0.%04x",
 300                         ipl_info.data.fcp.dev_id.devno);
 301         strcat(COMMAND_LINE, str);
 302         console_loglevel = 2;
 303 }
 304 #else
 305 static inline void setup_zfcpdump(unsigned int console_devno) {}
 306 #endif /* CONFIG_ZFCPDUMP */
 307
 308 #ifdef CONFIG_SMP
 309 void (*_machine_restart)(char *command) = machine_restart_smp;
 310 void (*_machine_halt)(void) = machine_halt_smp;
 311 void (*_machine_power_off)(void) = machine_power_off_smp;
 312 #else
 313 /*
 314  * Reboot, halt and power_off routines for non SMP.
 315  */
 316 static void do_machine_restart_nonsmp(char * __unused)
 317 {
 318         do_reipl();
 319 }
 320
 321 static void do_machine_halt_nonsmp(void)
 322 {
 323         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 324                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 325         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 326 }
 327
 328 static void do_machine_power_off_nonsmp(void)
 329 {
 330         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 331                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 332         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 333 }
 334
 335 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 336 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 337 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 338 #endif
 339
 340  /*
 341  * Reboot, halt and power_off stubs. They just call _machine_restart,
 342  * _machine_halt or _machine_power_off.
 343  */
 344
 345 void machine_restart(char *command)
 346 {
 347         if (!in_interrupt() || oops_in_progress)
 348                 /*
 349                  * Only unblank the console if we are called in enabled
 350                  * context or a bust_spinlocks cleared the way for us.
 351                  */
 352                 console_unblank();
 353         _machine_restart(command);
 354 }
 355
 356 void machine_halt(void)
 357 {
 358         if (!in_interrupt() || oops_in_progress)
 359                 /*
 360                  * Only unblank the console if we are called in enabled
 361                  * context or a bust_spinlocks cleared the way for us.
 362                  */
 363                 console_unblank();
 364         _machine_halt();
 365 }
 366
 367 void machine_power_off(void)
 368 {
 369         if (!in_interrupt() || oops_in_progress)
 370                 /*
 371                  * Only unblank the console if we are called in enabled
 372                  * context or a bust_spinlocks cleared the way for us.
 373                  */
 374                 console_unblank();
 375         _machine_power_off();
 376 }
 377
 378 /*
 379  * Dummy power off function.
 380  */
 381 void (*pm_power_off)(void) = machine_power_off;
 382
 383 static int __init early_parse_mem(char *p)
 384 {
 385         memory_end = memparse(p, &p);
 386         return 0;
 387 }
 388 early_param("mem", early_parse_mem);
 389
 390 /*
 391  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 392  */
 393 static int __init early_parse_ipldelay(char *p)
 394 {
 395         unsigned long delay = 0;
 396
 397         delay = simple_strtoul(p, &p, 0);
 398
 399         switch (*p) {
 400         case 's':
 401         case 'S':
 402                 delay *= 1000000;
 403                 break;
 404         case 'm':
 405         case 'M':
 406                 delay *= 60 * 1000000;
 407         }
 408
 409         /* now wait for the requested amount of time */
 410         udelay(delay);
 411
 412         return 0;
 413 }
 414 early_param("ipldelay", early_parse_ipldelay);
 415
 416 #ifdef CONFIG_S390_SWITCH_AMODE
 417 unsigned int switch_amode = 0;
 418 EXPORT_SYMBOL_GPL(switch_amode);
 419
 420 static void set_amode_and_uaccess(unsigned long user_amode,
 421                                   unsigned long user32_amode)
 422 {
 423         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 424                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 425                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 426 #ifdef CONFIG_COMPAT
 427         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 428                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 429                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 430         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 431                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 432                           PSW32_MASK_PSTATE;
 433 #endif
 434         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 435                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 436
 437         if (MACHINE_HAS_MVCOS) {
 438                 printk("mvcos available.\n");
 439                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 440         } else {
 441                 printk("mvcos not available.\n");
 442                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 443         }
 444 }
 445
 446 /*
 447  * Switch kernel/user addressing modes?
 448  */
 449 static int __init early_parse_switch_amode(char *p)
 450 {
 451         switch_amode = 1;
 452         return 0;
 453 }
 454 early_param("switch_amode", early_parse_switch_amode);
 455
 456 #else /* CONFIG_S390_SWITCH_AMODE */
 457 static inline void set_amode_and_uaccess(unsigned long user_amode,
 458                                          unsigned long user32_amode)
 459 {
 460 }
 461 #endif /* CONFIG_S390_SWITCH_AMODE */
 462
 463 #ifdef CONFIG_S390_EXEC_PROTECT
 464 unsigned int s390_noexec = 0;
 465 EXPORT_SYMBOL_GPL(s390_noexec);
 466
 467 /*
 468  * Enable execute protection?
 469  */
 470 static int __init early_parse_noexec(char *p)
 471 {
 472         if (!strncmp(p, "off", 3))
 473                 return 0;
 474         switch_amode = 1;
 475         s390_noexec = 1;
 476         return 0;
 477 }
 478 early_param("noexec", early_parse_noexec);
 479 #endif /* CONFIG_S390_EXEC_PROTECT */
 480
 481 static void setup_addressing_mode(void)
 482 {
 483         if (s390_noexec) {
 484                 printk("S390 execute protection active, ");
 485                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 486                 return;
 487         }
 488         if (switch_amode) {
 489                 printk("S390 address spaces switched, ");
 490                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 491         }
 492 }
 493
 494 static void __init
 495 setup_lowcore(void)
 496 {
 497         struct _lowcore *lc;
 498         int lc_pages;
 499
 500         /*
 501          * Setup lowcore for boot cpu
 502          */
 503         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 504         lc = (struct _lowcore *)
 505                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 506         memset(lc, 0, lc_pages * PAGE_SIZE);
 507         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 508         lc->restart_psw.addr =
 509                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 510         if (switch_amode)
 511                 lc->restart_psw.mask |= PSW_ASC_HOME;
 512         lc->external_new_psw.mask = psw_kernel_bits;
 513         lc->external_new_psw.addr =
 514                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 515         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 516         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 517         lc->program_new_psw.mask = psw_kernel_bits;
 518         lc->program_new_psw.addr =
 519                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 520         lc->mcck_new_psw.mask =
 521                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 522         lc->mcck_new_psw.addr =
 523                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 524         lc->io_new_psw.mask = psw_kernel_bits;
 525         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 526         lc->ipl_device = S390_lowcore.ipl_device;
 527         lc->jiffy_timer = -1LL;
 528         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 529         lc->async_stack = (unsigned long)
 530                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 531         lc->panic_stack = (unsigned long)
 532                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 533         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 534         lc->thread_info = (unsigned long) &init_thread_union;
 535 #ifndef CONFIG_64BIT
 536         if (MACHINE_HAS_IEEE) {
 537                 lc->extended_save_area_addr = (__u32)
 538                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 539                 /* enable extended save area */
 540                 __ctl_set_bit(14, 29);
 541         }
 542 #endif
 543         set_prefix((u32)(unsigned long) lc);
 544 }
 545
 546 static void __init
 547 setup_resources(void)
 548 {
 549         struct resource *res, *sub_res;
 550         int i;
 551
 552         code_resource.start = (unsigned long) &_text;
 553         code_resource.end = (unsigned long) &_etext - 1;
 554         data_resource.start = (unsigned long) &_etext;
 555         data_resource.end = (unsigned long) &_edata - 1;
 556
 557         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 558                 res = alloc_bootmem_low(sizeof(struct resource));
 559                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 560                 switch (memory_chunk[i].type) {
 561                 case CHUNK_READ_WRITE:
 562                         res->name = "System RAM";
 563                         break;
 564                 case CHUNK_READ_ONLY:
 565                         res->name = "System ROM";
 566                         res->flags |= IORESOURCE_READONLY;
 567                         break;
 568                 default:
 569                         res->name = "reserved";
 570                 }
 571                 res->start = memory_chunk[i].addr;
 572                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 573                 request_resource(&iomem_resource, res);
 574
 575                 if (code_resource.start >= res->start  &&
 576                         code_resource.start <= res->end &&
 577                         code_resource.end > res->end) {
 578                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 579                         memcpy(sub_res, &code_resource,
 580                                 sizeof(struct resource));
 581                         sub_res->end = res->end;
 582                         code_resource.start = res->end + 1;
 583                         request_resource(res, sub_res);
 584                 }
 585
 586                 if (code_resource.start >= res->start &&
 587                         code_resource.start <= res->end &&
 588                         code_resource.end <= res->end)
 589                         request_resource(res, &code_resource);
 590
 591                 if (data_resource.start >= res->start &&
 592                         data_resource.start <= res->end &&
 593                         data_resource.end > res->end) {
 594                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 595                         memcpy(sub_res, &data_resource,
 596                                 sizeof(struct resource));
 597                         sub_res->end = res->end;
 598                         data_resource.start = res->end + 1;
 599                         request_resource(res, sub_res);
 600                 }
 601
 602                 if (data_resource.start >= res->start &&
 603                         data_resource.start <= res->end &&
 604                         data_resource.end <= res->end)
 605                         request_resource(res, &data_resource);
 606         }
 607 }
 608
 609 unsigned long real_memory_size;
 610 EXPORT_SYMBOL_GPL(real_memory_size);
 611
 612 static void __init setup_memory_end(void)
 613 {
 614         unsigned long memory_size;
 615         unsigned long max_mem, max_phys;
 616         int i;
 617
 618 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 619         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 620                 memory_end = ZFCPDUMP_HSA_SIZE;
 621 #endif
 622         memory_size = 0;
 623         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 624         memory_end &= PAGE_MASK;
 625
 626         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 627
 628         for (i = 0; i < MEMORY_CHUNKS; i++) {
 629                 struct mem_chunk *chunk = &memory_chunk[i];
 630
 631                 real_memory_size = max(real_memory_size,
 632                                        chunk->addr + chunk->size);
 633                 if (chunk->addr >= max_mem) {
 634                         memset(chunk, 0, sizeof(*chunk));
 635                         continue;
 636                 }
 637                 if (chunk->addr + chunk->size > max_mem)
 638                         chunk->size = max_mem - chunk->addr;
 639                 memory_size = max(memory_size, chunk->addr + chunk->size);
 640         }
 641         if (!memory_end)
 642                 memory_end = memory_size;
 643 }
 644
 645 static void __init
 646 setup_memory(void)
 647 {
 648         unsigned long bootmap_size;
 649         unsigned long start_pfn, end_pfn;
 650         int i;
 651
 652         /*
 653          * partially used pages are not usable - thus
 654          * we are rounding upwards:
 655          */
 656         start_pfn = PFN_UP(__pa(&_end));
 657         end_pfn = max_pfn = PFN_DOWN(memory_end);
 658
 659 #ifdef CONFIG_BLK_DEV_INITRD
 660         /*
 661          * Move the initrd in case the bitmap of the bootmem allocater
 662          * would overwrite it.
 663          */
 664
 665         if (INITRD_START && INITRD_SIZE) {
 666                 unsigned long bmap_size;
 667                 unsigned long start;
 668
 669                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 670                 bmap_size = PFN_PHYS(bmap_size);
 671
 672                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 673                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 674
 675                         if (start + INITRD_SIZE > memory_end) {
 676                                 printk("initrd extends beyond end of memory "
 677                                        "(0x%08lx > 0x%08lx)\n"
 678                                        "disabling initrd\n",
 679                                        start + INITRD_SIZE, memory_end);
 680                                 INITRD_START = INITRD_SIZE = 0;
 681                         } else {
 682                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 683                                        "size: %ld)\n",
 684                                        INITRD_START, start, INITRD_SIZE);
 685                                 memmove((void *) start, (void *) INITRD_START,
 686                                         INITRD_SIZE);
 687                                 INITRD_START = start;
 688                         }
 689                 }
 690         }
 691 #endif
 692
 693         /*
 694          * Initialize the boot-time allocator
 695          */
 696         bootmap_size = init_bootmem(start_pfn, end_pfn);
 697
 698         /*
 699          * Register RAM areas with the bootmem allocator.
 700          */
 701
 702         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 703                 unsigned long start_chunk, end_chunk, pfn;
 704
 705                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 706                         continue;
 707                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 708                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 709                 end_chunk = min(end_chunk, end_pfn);
 710                 if (start_chunk >= end_chunk)
 711                         continue;
 712                 add_active_range(0, start_chunk, end_chunk);
 713                 pfn = max(start_chunk, start_pfn);
 714                 for (; pfn <= end_chunk; pfn++)
 715                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 716         }
 717
 718         psw_set_key(PAGE_DEFAULT_KEY);
 719
 720         free_bootmem_with_active_regions(0, max_pfn);
 721
 722         /*
 723          * Reserve memory used for lowcore/command line/kernel image.
 724          */
 725         reserve_bootmem(0, (unsigned long)_ehead);
 726         reserve_bootmem((unsigned long)_stext,
 727                         PFN_PHYS(start_pfn) - (unsigned long)_stext);
 728         /*
 729          * Reserve the bootmem bitmap itself as well. We do this in two
 730          * steps (first step was init_bootmem()) because this catches
 731          * the (very unlikely) case of us accidentally initializing the
 732          * bootmem allocator with an invalid RAM area.
 733          */
 734         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 735
 736 #ifdef CONFIG_BLK_DEV_INITRD
 737         if (INITRD_START && INITRD_SIZE) {
 738                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 739                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 740                         initrd_start = INITRD_START;
 741                         initrd_end = initrd_start + INITRD_SIZE;
 742                 } else {
 743                         printk("initrd extends beyond end of memory "
 744                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 745                                initrd_start + INITRD_SIZE, memory_end);
 746                         initrd_start = initrd_end = 0;
 747                 }
 748         }
 749 #endif
 750 }
 751
 752 /*
 753  * Setup function called from init/main.c just after the banner
 754  * was printed.
 755  */
 756
 757 void __init
 758 setup_arch(char **cmdline_p)
 759 {
 760         /*
 761          * print what head.S has found out about the machine
 762          */
 763 #ifndef CONFIG_64BIT
 764         printk((MACHINE_IS_VM) ?
 765                "We are running under VM (31 bit mode)\n" :
 766                "We are running native (31 bit mode)\n");
 767         printk((MACHINE_HAS_IEEE) ?
 768                "This machine has an IEEE fpu\n" :
 769                "This machine has no IEEE fpu\n");
 770 #else /* CONFIG_64BIT */
 771         printk((MACHINE_IS_VM) ?
 772                "We are running under VM (64 bit mode)\n" :
 773                "We are running native (64 bit mode)\n");
 774 #endif /* CONFIG_64BIT */
 775
 776         /* Save unparsed command line copy for /proc/cmdline */
 777         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 778
 779         *cmdline_p = COMMAND_LINE;
 780         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 781
 782         ROOT_DEV = Root_RAM0;
 783
 784         init_mm.start_code = PAGE_OFFSET;
 785         init_mm.end_code = (unsigned long) &_etext;
 786         init_mm.end_data = (unsigned long) &_edata;
 787         init_mm.brk = (unsigned long) &_end;
 788
 789         if (MACHINE_HAS_MVCOS)
 790                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 791         else
 792                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 793
 794         parse_early_param();
 795
 796         setup_ipl_info();
 797         setup_memory_end();
 798         setup_addressing_mode();
 799         setup_memory();
 800         setup_resources();
 801         setup_lowcore();
 802
 803         cpu_init();
 804         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 805         smp_setup_cpu_possible_map();
 806
 807         /*
 808          * Create kernel page tables and switch to virtual addressing.
 809          */
 810         paging_init();
 811
 812         /* Setup default console */
 813         conmode_default();
 814
 815         /* Setup zfcpdump support */
 816         setup_zfcpdump(console_devno);
 817 }
 818
 819 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 820 {
 821    printk("cpu %d "
 822 #ifdef CONFIG_SMP
 823            "phys_idx=%d "
 824 #endif
 825            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 826            cpuinfo->cpu_nr,
 827 #ifdef CONFIG_SMP
 828            cpuinfo->cpu_addr,
 829 #endif
 830            cpuinfo->cpu_id.version,
 831            cpuinfo->cpu_id.ident,
 832            cpuinfo->cpu_id.machine,
 833            cpuinfo->cpu_id.unused);
 834 }
 835
 836 /*
 837  * show_cpuinfo - Get information on one CPU for use by procfs.
 838  */
 839
 840 static int show_cpuinfo(struct seq_file *m, void *v)
 841 {
 842         struct cpuinfo_S390 *cpuinfo;
 843         unsigned long n = (unsigned long) v - 1;
 844
 845         s390_adjust_jiffies();
 846         preempt_disable();
 847         if (!n) {
 848                 seq_printf(m, "vendor_id       : IBM/S390\n"
 849                                "# processors    : %i\n"
 850                                "bogomips per cpu: %lu.%02lu\n",
 851                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 852                                (loops_per_jiffy/(5000/HZ))%100);
 853         }
 854         if (cpu_online(n)) {
 855 #ifdef CONFIG_SMP
 856                 if (smp_processor_id() == n)
 857                         cpuinfo = &S390_lowcore.cpu_data;
 858                 else
 859                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 860 #else
 861                 cpuinfo = &S390_lowcore.cpu_data;
 862 #endif
 863                 seq_printf(m, "processor %li: "
 864                                "version = %02X,  "
 865                                "identification = %06X,  "
 866                                "machine = %04X\n",
 867                                n, cpuinfo->cpu_id.version,
 868                                cpuinfo->cpu_id.ident,
 869                                cpuinfo->cpu_id.machine);
 870         }
 871         preempt_enable();
 872         return 0;
 873 }
 874
 875 static void *c_start(struct seq_file *m, loff_t *pos)
 876 {
 877         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 878 }
 879 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 880 {
 881         ++*pos;
 882         return c_start(m, pos);
 883 }
 884 static void c_stop(struct seq_file *m, void *v)
 885 {
 886 }
 887 struct seq_operations cpuinfo_op = {
 888         .start  = c_start,
 889         .next   = c_next,
 890         .stop   = c_stop,
 891         .show   = show_cpuinfo,
 892 };
 893