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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/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 inline 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 /*
 288  * Create a Kernel NSS if the SAVESYS= parameter is defined
 289 */
 290 #define DEFSYS_CMD_SIZE 96
 291 #define SAVESYS_CMD_SIZE        32
 292
 293 extern int _eshared;
 294 char kernel_nss_name[NSS_NAME_SIZE + 1];
 295
 296 #ifdef CONFIG_SHARED_KERNEL
 297 static __init void create_kernel_nss(void)
 298 {
 299         unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
 300 #ifdef CONFIG_BLK_DEV_INITRD
 301         unsigned int sinitrd_pfn, einitrd_pfn;
 302 #endif
 303         int response;
 304         char *savesys_ptr;
 305         char upper_command_line[COMMAND_LINE_SIZE];
 306         char defsys_cmd[DEFSYS_CMD_SIZE];
 307         char savesys_cmd[SAVESYS_CMD_SIZE];
 308
 309         /* Do nothing if we are not running under VM */
 310         if (!MACHINE_IS_VM)
 311                 return;
 312
 313         /* Convert COMMAND_LINE to upper case */
 314         for (i = 0; i < strlen(COMMAND_LINE); i++)
 315                 upper_command_line[i] = toupper(COMMAND_LINE[i]);
 316
 317         savesys_ptr = strstr(upper_command_line, "SAVESYS=");
 318
 319         if (!savesys_ptr)
 320                 return;
 321
 322         savesys_ptr += 8;    /* Point to the beginning of the NSS name */
 323         for (i = 0; i < NSS_NAME_SIZE; i++) {
 324                 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
 325                         break;
 326                 kernel_nss_name[i] = savesys_ptr[i];
 327         }
 328
 329         stext_pfn = PFN_DOWN(__pa(&_stext));
 330         eshared_pfn = PFN_DOWN(__pa(&_eshared));
 331         end_pfn = PFN_UP(__pa(&_end));
 332         min_size = end_pfn << 2;
 333
 334         sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
 335                 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
 336                 eshared_pfn, end_pfn);
 337
 338 #ifdef CONFIG_BLK_DEV_INITRD
 339         if (INITRD_START && INITRD_SIZE) {
 340                 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
 341                 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
 342                 min_size = einitrd_pfn << 2;
 343                 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
 344                 sinitrd_pfn, einitrd_pfn);
 345         }
 346 #endif
 347
 348         sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK", defsys_cmd, min_size);
 349         sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
 350                 kernel_nss_name, kernel_nss_name);
 351
 352         __cpcmd(defsys_cmd, NULL, 0, &response);
 353
 354         if (response != 0)
 355                 return;
 356
 357         __cpcmd(savesys_cmd, NULL, 0, &response);
 358
 359         if (response != strlen(savesys_cmd))
 360                 return;
 361
 362         ipl_flags = IPL_NSS_VALID;
 363 }
 364
 365 #else /* CONFIG_SHARED_KERNEL */
 366
 367 static inline void create_kernel_nss(void) { }
 368
 369 #endif /* CONFIG_SHARED_KERNEL */
 370
 371 /*
 372  * Clear bss memory
 373  */
 374 static __init void clear_bss_section(void)
 375 {
 376         memset(__bss_start, 0, _end - __bss_start);
 377 }
 378
 379 /*
 380  * Initialize storage key for kernel pages
 381  */
 382 static __init void init_kernel_storage_key(void)
 383 {
 384         unsigned long end_pfn, init_pfn;
 385
 386         end_pfn = PFN_UP(__pa(&_end));
 387
 388         for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
 389                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 390 }
 391
 392 static __init void detect_machine_type(void)
 393 {
 394         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 395
 396         asm volatile("stidp %0" : "=m" (S390_lowcore.cpu_data.cpu_id));
 397
 398         /* Running under z/VM ? */
 399         if (cpuinfo->cpu_id.version == 0xff)
 400                 machine_flags |= 1;
 401
 402         /* Running on a P/390 ? */
 403         if (cpuinfo->cpu_id.machine == 0x7490)
 404                 machine_flags |= 4;
 405 }
 406
 407 /*
 408  * Save ipl parameters, clear bss memory, initialize storage keys
 409  * and create a kernel NSS at startup if the SAVESYS= parm is defined
 410  */
 411 void __init startup_init(void)
 412 {
 413         ipl_save_parameters();
 414         clear_bss_section();
 415         init_kernel_storage_key();
 416         lockdep_init();
 417         detect_machine_type();
 418         create_kernel_nss();
 419 }
 420
 421 #ifdef CONFIG_SMP
 422 void (*_machine_restart)(char *command) = machine_restart_smp;
 423 void (*_machine_halt)(void) = machine_halt_smp;
 424 void (*_machine_power_off)(void) = machine_power_off_smp;
 425 #else
 426 /*
 427  * Reboot, halt and power_off routines for non SMP.
 428  */
 429 static void do_machine_restart_nonsmp(char * __unused)
 430 {
 431         do_reipl();
 432 }
 433
 434 static void do_machine_halt_nonsmp(void)
 435 {
 436         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 437                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 438         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 439 }
 440
 441 static void do_machine_power_off_nonsmp(void)
 442 {
 443         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 444                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 445         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 446 }
 447
 448 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 449 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 450 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 451 #endif
 452
 453  /*
 454  * Reboot, halt and power_off stubs. They just call _machine_restart,
 455  * _machine_halt or _machine_power_off.
 456  */
 457
 458 void machine_restart(char *command)
 459 {
 460         if (!in_interrupt() || oops_in_progress)
 461                 /*
 462                  * Only unblank the console if we are called in enabled
 463                  * context or a bust_spinlocks cleared the way for us.
 464                  */
 465                 console_unblank();
 466         _machine_restart(command);
 467 }
 468
 469 void machine_halt(void)
 470 {
 471         if (!in_interrupt() || oops_in_progress)
 472                 /*
 473                  * Only unblank the console if we are called in enabled
 474                  * context or a bust_spinlocks cleared the way for us.
 475                  */
 476                 console_unblank();
 477         _machine_halt();
 478 }
 479
 480 void machine_power_off(void)
 481 {
 482         if (!in_interrupt() || oops_in_progress)
 483                 /*
 484                  * Only unblank the console if we are called in enabled
 485                  * context or a bust_spinlocks cleared the way for us.
 486                  */
 487                 console_unblank();
 488         _machine_power_off();
 489 }
 490
 491 /*
 492  * Dummy power off function.
 493  */
 494 void (*pm_power_off)(void) = machine_power_off;
 495
 496 static int __init early_parse_mem(char *p)
 497 {
 498         memory_end = memparse(p, &p);
 499         return 0;
 500 }
 501 early_param("mem", early_parse_mem);
 502
 503 /*
 504  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 505  */
 506 static int __init early_parse_ipldelay(char *p)
 507 {
 508         unsigned long delay = 0;
 509
 510         delay = simple_strtoul(p, &p, 0);
 511
 512         switch (*p) {
 513         case 's':
 514         case 'S':
 515                 delay *= 1000000;
 516                 break;
 517         case 'm':
 518         case 'M':
 519                 delay *= 60 * 1000000;
 520         }
 521
 522         /* now wait for the requested amount of time */
 523         udelay(delay);
 524
 525         return 0;
 526 }
 527 early_param("ipldelay", early_parse_ipldelay);
 528
 529 #ifdef CONFIG_S390_SWITCH_AMODE
 530 unsigned int switch_amode = 0;
 531 EXPORT_SYMBOL_GPL(switch_amode);
 532
 533 static inline void set_amode_and_uaccess(unsigned long user_amode,
 534                                          unsigned long user32_amode)
 535 {
 536         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 537                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 538                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 539 #ifdef CONFIG_COMPAT
 540         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 541                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 542                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 543         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 544                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 545                           PSW32_MASK_PSTATE;
 546 #endif
 547         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 548                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 549
 550         if (MACHINE_HAS_MVCOS) {
 551                 printk("mvcos available.\n");
 552                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 553         } else {
 554                 printk("mvcos not available.\n");
 555                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 556         }
 557 }
 558
 559 /*
 560  * Switch kernel/user addressing modes?
 561  */
 562 static int __init early_parse_switch_amode(char *p)
 563 {
 564         switch_amode = 1;
 565         return 0;
 566 }
 567 early_param("switch_amode", early_parse_switch_amode);
 568
 569 #else /* CONFIG_S390_SWITCH_AMODE */
 570 static inline void set_amode_and_uaccess(unsigned long user_amode,
 571                                          unsigned long user32_amode)
 572 {
 573 }
 574 #endif /* CONFIG_S390_SWITCH_AMODE */
 575
 576 #ifdef CONFIG_S390_EXEC_PROTECT
 577 unsigned int s390_noexec = 0;
 578 EXPORT_SYMBOL_GPL(s390_noexec);
 579
 580 /*
 581  * Enable execute protection?
 582  */
 583 static int __init early_parse_noexec(char *p)
 584 {
 585         if (!strncmp(p, "off", 3))
 586                 return 0;
 587         switch_amode = 1;
 588         s390_noexec = 1;
 589         return 0;
 590 }
 591 early_param("noexec", early_parse_noexec);
 592 #endif /* CONFIG_S390_EXEC_PROTECT */
 593
 594 static void setup_addressing_mode(void)
 595 {
 596         if (s390_noexec) {
 597                 printk("S390 execute protection active, ");
 598                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 599                 return;
 600         }
 601         if (switch_amode) {
 602                 printk("S390 address spaces switched, ");
 603                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 604         }
 605 }
 606
 607 static void __init
 608 setup_lowcore(void)
 609 {
 610         struct _lowcore *lc;
 611         int lc_pages;
 612
 613         /*
 614          * Setup lowcore for boot cpu
 615          */
 616         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 617         lc = (struct _lowcore *)
 618                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 619         memset(lc, 0, lc_pages * PAGE_SIZE);
 620         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 621         lc->restart_psw.addr =
 622                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 623         if (switch_amode)
 624                 lc->restart_psw.mask |= PSW_ASC_HOME;
 625         lc->external_new_psw.mask = psw_kernel_bits;
 626         lc->external_new_psw.addr =
 627                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 628         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 629         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 630         lc->program_new_psw.mask = psw_kernel_bits;
 631         lc->program_new_psw.addr =
 632                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 633         lc->mcck_new_psw.mask =
 634                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 635         lc->mcck_new_psw.addr =
 636                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 637         lc->io_new_psw.mask = psw_kernel_bits;
 638         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 639         lc->ipl_device = S390_lowcore.ipl_device;
 640         lc->jiffy_timer = -1LL;
 641         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 642         lc->async_stack = (unsigned long)
 643                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 644         lc->panic_stack = (unsigned long)
 645                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 646         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 647         lc->thread_info = (unsigned long) &init_thread_union;
 648 #ifndef CONFIG_64BIT
 649         if (MACHINE_HAS_IEEE) {
 650                 lc->extended_save_area_addr = (__u32)
 651                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 652                 /* enable extended save area */
 653                 __ctl_set_bit(14, 29);
 654         }
 655 #endif
 656         set_prefix((u32)(unsigned long) lc);
 657 }
 658
 659 static void __init
 660 setup_resources(void)
 661 {
 662         struct resource *res, *sub_res;
 663         int i;
 664
 665         code_resource.start = (unsigned long) &_text;
 666         code_resource.end = (unsigned long) &_etext - 1;
 667         data_resource.start = (unsigned long) &_etext;
 668         data_resource.end = (unsigned long) &_edata - 1;
 669
 670         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 671                 res = alloc_bootmem_low(sizeof(struct resource));
 672                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 673                 switch (memory_chunk[i].type) {
 674                 case CHUNK_READ_WRITE:
 675                         res->name = "System RAM";
 676                         break;
 677                 case CHUNK_READ_ONLY:
 678                         res->name = "System ROM";
 679                         res->flags |= IORESOURCE_READONLY;
 680                         break;
 681                 default:
 682                         res->name = "reserved";
 683                 }
 684                 res->start = memory_chunk[i].addr;
 685                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 686                 request_resource(&iomem_resource, res);
 687
 688                 if (code_resource.start >= res->start  &&
 689                         code_resource.start <= res->end &&
 690                         code_resource.end > res->end) {
 691                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 692                         memcpy(sub_res, &code_resource,
 693                                 sizeof(struct resource));
 694                         sub_res->end = res->end;
 695                         code_resource.start = res->end + 1;
 696                         request_resource(res, sub_res);
 697                 }
 698
 699                 if (code_resource.start >= res->start &&
 700                         code_resource.start <= res->end &&
 701                         code_resource.end <= res->end)
 702                         request_resource(res, &code_resource);
 703
 704                 if (data_resource.start >= res->start &&
 705                         data_resource.start <= res->end &&
 706                         data_resource.end > res->end) {
 707                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 708                         memcpy(sub_res, &data_resource,
 709                                 sizeof(struct resource));
 710                         sub_res->end = res->end;
 711                         data_resource.start = res->end + 1;
 712                         request_resource(res, sub_res);
 713                 }
 714
 715                 if (data_resource.start >= res->start &&
 716                         data_resource.start <= res->end &&
 717                         data_resource.end <= res->end)
 718                         request_resource(res, &data_resource);
 719         }
 720 }
 721
 722 static void __init setup_memory_end(void)
 723 {
 724         unsigned long real_size, memory_size;
 725         unsigned long max_mem, max_phys;
 726         int i;
 727
 728         memory_size = real_size = 0;
 729         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 730         memory_end &= PAGE_MASK;
 731
 732         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 733
 734         for (i = 0; i < MEMORY_CHUNKS; i++) {
 735                 struct mem_chunk *chunk = &memory_chunk[i];
 736
 737                 real_size = max(real_size, chunk->addr + chunk->size);
 738                 if (chunk->addr >= max_mem) {
 739                         memset(chunk, 0, sizeof(*chunk));
 740                         continue;
 741                 }
 742                 if (chunk->addr + chunk->size > max_mem)
 743                         chunk->size = max_mem - chunk->addr;
 744                 memory_size = max(memory_size, chunk->addr + chunk->size);
 745         }
 746         if (!memory_end)
 747                 memory_end = memory_size;
 748 }
 749
 750 static void __init
 751 setup_memory(void)
 752 {
 753         unsigned long bootmap_size;
 754         unsigned long start_pfn, end_pfn;
 755         int i;
 756
 757         /*
 758          * partially used pages are not usable - thus
 759          * we are rounding upwards:
 760          */
 761         start_pfn = PFN_UP(__pa(&_end));
 762         end_pfn = max_pfn = PFN_DOWN(memory_end);
 763
 764 #ifdef CONFIG_BLK_DEV_INITRD
 765         /*
 766          * Move the initrd in case the bitmap of the bootmem allocater
 767          * would overwrite it.
 768          */
 769
 770         if (INITRD_START && INITRD_SIZE) {
 771                 unsigned long bmap_size;
 772                 unsigned long start;
 773
 774                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 775                 bmap_size = PFN_PHYS(bmap_size);
 776
 777                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 778                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 779
 780                         if (start + INITRD_SIZE > memory_end) {
 781                                 printk("initrd extends beyond end of memory "
 782                                        "(0x%08lx > 0x%08lx)\n"
 783                                        "disabling initrd\n",
 784                                        start + INITRD_SIZE, memory_end);
 785                                 INITRD_START = INITRD_SIZE = 0;
 786                         } else {
 787                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 788                                        "size: %ld)\n",
 789                                        INITRD_START, start, INITRD_SIZE);
 790                                 memmove((void *) start, (void *) INITRD_START,
 791                                         INITRD_SIZE);
 792                                 INITRD_START = start;
 793                         }
 794                 }
 795         }
 796 #endif
 797
 798         /*
 799          * Initialize the boot-time allocator
 800          */
 801         bootmap_size = init_bootmem(start_pfn, end_pfn);
 802
 803         /*
 804          * Register RAM areas with the bootmem allocator.
 805          */
 806
 807         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 808                 unsigned long start_chunk, end_chunk, pfn;
 809
 810                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 811                         continue;
 812                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 813                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 814                 end_chunk = min(end_chunk, end_pfn);
 815                 if (start_chunk >= end_chunk)
 816                         continue;
 817                 add_active_range(0, start_chunk, end_chunk);
 818                 pfn = max(start_chunk, start_pfn);
 819                 for (; pfn <= end_chunk; pfn++)
 820                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 821         }
 822
 823         psw_set_key(PAGE_DEFAULT_KEY);
 824
 825         free_bootmem_with_active_regions(0, max_pfn);
 826         reserve_bootmem(0, PFN_PHYS(start_pfn));
 827
 828         /*
 829          * Reserve the bootmem bitmap itself as well. We do this in two
 830          * steps (first step was init_bootmem()) because this catches
 831          * the (very unlikely) case of us accidentally initializing the
 832          * bootmem allocator with an invalid RAM area.
 833          */
 834         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 835
 836 #ifdef CONFIG_BLK_DEV_INITRD
 837         if (INITRD_START && INITRD_SIZE) {
 838                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 839                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 840                         initrd_start = INITRD_START;
 841                         initrd_end = initrd_start + INITRD_SIZE;
 842                 } else {
 843                         printk("initrd extends beyond end of memory "
 844                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 845                                initrd_start + INITRD_SIZE, memory_end);
 846                         initrd_start = initrd_end = 0;
 847                 }
 848         }
 849 #endif
 850 }
 851
 852 /*
 853  * Setup function called from init/main.c just after the banner
 854  * was printed.
 855  */
 856
 857 void __init
 858 setup_arch(char **cmdline_p)
 859 {
 860         /*
 861          * print what head.S has found out about the machine
 862          */
 863 #ifndef CONFIG_64BIT
 864         printk((MACHINE_IS_VM) ?
 865                "We are running under VM (31 bit mode)\n" :
 866                "We are running native (31 bit mode)\n");
 867         printk((MACHINE_HAS_IEEE) ?
 868                "This machine has an IEEE fpu\n" :
 869                "This machine has no IEEE fpu\n");
 870 #else /* CONFIG_64BIT */
 871         printk((MACHINE_IS_VM) ?
 872                "We are running under VM (64 bit mode)\n" :
 873                "We are running native (64 bit mode)\n");
 874 #endif /* CONFIG_64BIT */
 875
 876         /* Save unparsed command line copy for /proc/cmdline */
 877         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 878
 879         *cmdline_p = COMMAND_LINE;
 880         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 881
 882         ROOT_DEV = Root_RAM0;
 883
 884         init_mm.start_code = PAGE_OFFSET;
 885         init_mm.end_code = (unsigned long) &_etext;
 886         init_mm.end_data = (unsigned long) &_edata;
 887         init_mm.brk = (unsigned long) &_end;
 888
 889         if (MACHINE_HAS_MVCOS)
 890                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 891         else
 892                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 893
 894         parse_early_param();
 895
 896         setup_memory_end();
 897         setup_addressing_mode();
 898         setup_memory();
 899         setup_resources();
 900         setup_lowcore();
 901
 902         cpu_init();
 903         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 904         smp_setup_cpu_possible_map();
 905
 906         /*
 907          * Create kernel page tables and switch to virtual addressing.
 908          */
 909         paging_init();
 910
 911         /* Setup default console */
 912         conmode_default();
 913 }
 914
 915 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 916 {
 917    printk("cpu %d "
 918 #ifdef CONFIG_SMP
 919            "phys_idx=%d "
 920 #endif
 921            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 922            cpuinfo->cpu_nr,
 923 #ifdef CONFIG_SMP
 924            cpuinfo->cpu_addr,
 925 #endif
 926            cpuinfo->cpu_id.version,
 927            cpuinfo->cpu_id.ident,
 928            cpuinfo->cpu_id.machine,
 929            cpuinfo->cpu_id.unused);
 930 }
 931
 932 /*
 933  * show_cpuinfo - Get information on one CPU for use by procfs.
 934  */
 935
 936 static int show_cpuinfo(struct seq_file *m, void *v)
 937 {
 938         struct cpuinfo_S390 *cpuinfo;
 939         unsigned long n = (unsigned long) v - 1;
 940
 941         s390_adjust_jiffies();
 942         preempt_disable();
 943         if (!n) {
 944                 seq_printf(m, "vendor_id       : IBM/S390\n"
 945                                "# processors    : %i\n"
 946                                "bogomips per cpu: %lu.%02lu\n",
 947                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 948                                (loops_per_jiffy/(5000/HZ))%100);
 949         }
 950         if (cpu_online(n)) {
 951 #ifdef CONFIG_SMP
 952                 if (smp_processor_id() == n)
 953                         cpuinfo = &S390_lowcore.cpu_data;
 954                 else
 955                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 956 #else
 957                 cpuinfo = &S390_lowcore.cpu_data;
 958 #endif
 959                 seq_printf(m, "processor %li: "
 960                                "version = %02X,  "
 961                                "identification = %06X,  "
 962                                "machine = %04X\n",
 963                                n, cpuinfo->cpu_id.version,
 964                                cpuinfo->cpu_id.ident,
 965                                cpuinfo->cpu_id.machine);
 966         }
 967         preempt_enable();
 968         return 0;
 969 }
 970
 971 static void *c_start(struct seq_file *m, loff_t *pos)
 972 {
 973         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 974 }
 975 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 976 {
 977         ++*pos;
 978         return c_start(m, pos);
 979 }
 980 static void c_stop(struct seq_file *m, void *v)
 981 {
 982 }
 983 struct seq_operations cpuinfo_op = {
 984         .start  = c_start,
 985         .next   = c_next,
 986         .stop   = c_stop,
 987         .show   = show_cpuinfo,
 988 };
 989