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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
  42 #include <asm/uaccess.h>
  43 #include <asm/system.h>
  44 #include <asm/smp.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/cpcmd.h>
  47 #include <asm/lowcore.h>
  48 #include <asm/irq.h>
  49 #include <asm/page.h>
  50 #include <asm/ptrace.h>
  51 #include <asm/sections.h>
  52
  53 /*
  54  * User copy operations.
  55  */
  56 struct uaccess_ops uaccess;
  57 EXPORT_SYMBOL_GPL(uaccess);
  58
  59 /*
  60  * Machine setup..
  61  */
  62 unsigned int console_mode = 0;
  63 unsigned int console_devno = -1;
  64 unsigned int console_irq = -1;
  65 unsigned long memory_size = 0;
  66 unsigned long machine_flags = 0;
  67 struct {
  68         unsigned long addr, size, type;
  69 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  70 #define CHUNK_READ_WRITE 0
  71 #define CHUNK_READ_ONLY 1
  72 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  73 static unsigned long __initdata memory_end;
  74
  75 /*
  76  * This is set up by the setup-routine at boot-time
  77  * for S390 need to find out, what we have to setup
  78  * using address 0x10400 ...
  79  */
  80
  81 #include <asm/setup.h>
  82
  83 static struct resource code_resource = {
  84         .name  = "Kernel code",
  85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  86 };
  87
  88 static struct resource data_resource = {
  89         .name = "Kernel data",
  90         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  91 };
  92
  93 /*
  94  * cpu_init() initializes state that is per-CPU.
  95  */
  96 void __devinit cpu_init (void)
  97 {
  98         int addr = hard_smp_processor_id();
  99
 100         /*
 101          * Store processor id in lowcore (used e.g. in timer_interrupt)
 102          */
 103         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 104         S390_lowcore.cpu_data.cpu_addr = addr;
 105
 106         /*
 107          * Force FPU initialization:
 108          */
 109         clear_thread_flag(TIF_USEDFPU);
 110         clear_used_math();
 111
 112         atomic_inc(&init_mm.mm_count);
 113         current->active_mm = &init_mm;
 114         if (current->mm)
 115                 BUG();
 116         enter_lazy_tlb(&init_mm, current);
 117 }
 118
 119 /*
 120  * VM halt and poweroff setup routines
 121  */
 122 char vmhalt_cmd[128] = "";
 123 char vmpoff_cmd[128] = "";
 124 char vmpanic_cmd[128] = "";
 125
 126 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 127 {
 128         int sx, dx;
 129
 130         dx = 0;
 131         for (sx = 0; src[sx] != 0; sx++) {
 132                 if (src[sx] == '"') continue;
 133                 dst[dx++] = src[sx];
 134                 if (dx >= n) break;
 135         }
 136 }
 137
 138 static int __init vmhalt_setup(char *str)
 139 {
 140         strncpy_skip_quote(vmhalt_cmd, str, 127);
 141         vmhalt_cmd[127] = 0;
 142         return 1;
 143 }
 144
 145 __setup("vmhalt=", vmhalt_setup);
 146
 147 static int __init vmpoff_setup(char *str)
 148 {
 149         strncpy_skip_quote(vmpoff_cmd, str, 127);
 150         vmpoff_cmd[127] = 0;
 151         return 1;
 152 }
 153
 154 __setup("vmpoff=", vmpoff_setup);
 155
 156 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 157                           void *data)
 158 {
 159         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 160                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 161
 162         return NOTIFY_OK;
 163 }
 164
 165 #define PANIC_PRI_VMPANIC       0
 166
 167 static struct notifier_block vmpanic_nb = {
 168         .notifier_call = vmpanic_notify,
 169         .priority = PANIC_PRI_VMPANIC
 170 };
 171
 172 static int __init vmpanic_setup(char *str)
 173 {
 174         static int register_done __initdata = 0;
 175
 176         strncpy_skip_quote(vmpanic_cmd, str, 127);
 177         vmpanic_cmd[127] = 0;
 178         if (!register_done) {
 179                 register_done = 1;
 180                 atomic_notifier_chain_register(&panic_notifier_list,
 181                                                &vmpanic_nb);
 182         }
 183         return 1;
 184 }
 185
 186 __setup("vmpanic=", vmpanic_setup);
 187
 188 /*
 189  * condev= and conmode= setup parameter.
 190  */
 191
 192 static int __init condev_setup(char *str)
 193 {
 194         int vdev;
 195
 196         vdev = simple_strtoul(str, &str, 0);
 197         if (vdev >= 0 && vdev < 65536) {
 198                 console_devno = vdev;
 199                 console_irq = -1;
 200         }
 201         return 1;
 202 }
 203
 204 __setup("condev=", condev_setup);
 205
 206 static int __init conmode_setup(char *str)
 207 {
 208 #if defined(CONFIG_SCLP_CONSOLE)
 209         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 210                 SET_CONSOLE_SCLP;
 211 #endif
 212 #if defined(CONFIG_TN3215_CONSOLE)
 213         if (strncmp(str, "3215", 5) == 0)
 214                 SET_CONSOLE_3215;
 215 #endif
 216 #if defined(CONFIG_TN3270_CONSOLE)
 217         if (strncmp(str, "3270", 5) == 0)
 218                 SET_CONSOLE_3270;
 219 #endif
 220         return 1;
 221 }
 222
 223 __setup("conmode=", conmode_setup);
 224
 225 static void __init conmode_default(void)
 226 {
 227         char query_buffer[1024];
 228         char *ptr;
 229
 230         if (MACHINE_IS_VM) {
 231                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 232                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 233                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 234                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 235                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 236                 ptr = strstr(query_buffer, "CONMODE");
 237                 /*
 238                  * Set the conmode to 3215 so that the device recognition
 239                  * will set the cu_type of the console to 3215. If the
 240                  * conmode is 3270 and we don't set it back then both
 241                  * 3215 and the 3270 driver will try to access the console
 242                  * device (3215 as console and 3270 as normal tty).
 243                  */
 244                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 245                 if (ptr == NULL) {
 246 #if defined(CONFIG_SCLP_CONSOLE)
 247                         SET_CONSOLE_SCLP;
 248 #endif
 249                         return;
 250                 }
 251                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 252 #if defined(CONFIG_TN3270_CONSOLE)
 253                         SET_CONSOLE_3270;
 254 #elif defined(CONFIG_TN3215_CONSOLE)
 255                         SET_CONSOLE_3215;
 256 #elif defined(CONFIG_SCLP_CONSOLE)
 257                         SET_CONSOLE_SCLP;
 258 #endif
 259                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 260 #if defined(CONFIG_TN3215_CONSOLE)
 261                         SET_CONSOLE_3215;
 262 #elif defined(CONFIG_TN3270_CONSOLE)
 263                         SET_CONSOLE_3270;
 264 #elif defined(CONFIG_SCLP_CONSOLE)
 265                         SET_CONSOLE_SCLP;
 266 #endif
 267                 }
 268         } else if (MACHINE_IS_P390) {
 269 #if defined(CONFIG_TN3215_CONSOLE)
 270                 SET_CONSOLE_3215;
 271 #elif defined(CONFIG_TN3270_CONSOLE)
 272                 SET_CONSOLE_3270;
 273 #endif
 274         } else {
 275 #if defined(CONFIG_SCLP_CONSOLE)
 276                 SET_CONSOLE_SCLP;
 277 #endif
 278         }
 279 }
 280
 281 #ifdef CONFIG_SMP
 282 extern void machine_restart_smp(char *);
 283 extern void machine_halt_smp(void);
 284 extern void machine_power_off_smp(void);
 285
 286 void (*_machine_restart)(char *command) = machine_restart_smp;
 287 void (*_machine_halt)(void) = machine_halt_smp;
 288 void (*_machine_power_off)(void) = machine_power_off_smp;
 289 #else
 290 /*
 291  * Reboot, halt and power_off routines for non SMP.
 292  */
 293 static void do_machine_restart_nonsmp(char * __unused)
 294 {
 295         do_reipl();
 296 }
 297
 298 static void do_machine_halt_nonsmp(void)
 299 {
 300         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 301                 cpcmd(vmhalt_cmd, NULL, 0, NULL);
 302         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 303 }
 304
 305 static void do_machine_power_off_nonsmp(void)
 306 {
 307         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 308                 cpcmd(vmpoff_cmd, NULL, 0, NULL);
 309         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 310 }
 311
 312 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 313 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 314 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 315 #endif
 316
 317  /*
 318  * Reboot, halt and power_off stubs. They just call _machine_restart,
 319  * _machine_halt or _machine_power_off.
 320  */
 321
 322 void machine_restart(char *command)
 323 {
 324         if (!in_interrupt() || oops_in_progress)
 325                 /*
 326                  * Only unblank the console if we are called in enabled
 327                  * context or a bust_spinlocks cleared the way for us.
 328                  */
 329                 console_unblank();
 330         _machine_restart(command);
 331 }
 332
 333 void machine_halt(void)
 334 {
 335         if (!in_interrupt() || oops_in_progress)
 336                 /*
 337                  * Only unblank the console if we are called in enabled
 338                  * context or a bust_spinlocks cleared the way for us.
 339                  */
 340                 console_unblank();
 341         _machine_halt();
 342 }
 343
 344 void machine_power_off(void)
 345 {
 346         if (!in_interrupt() || oops_in_progress)
 347                 /*
 348                  * Only unblank the console if we are called in enabled
 349                  * context or a bust_spinlocks cleared the way for us.
 350                  */
 351                 console_unblank();
 352         _machine_power_off();
 353 }
 354
 355 /*
 356  * Dummy power off function.
 357  */
 358 void (*pm_power_off)(void) = machine_power_off;
 359
 360 static int __init early_parse_mem(char *p)
 361 {
 362         memory_end = memparse(p, &p);
 363         return 0;
 364 }
 365 early_param("mem", early_parse_mem);
 366
 367 /*
 368  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 369  */
 370 static int __init early_parse_ipldelay(char *p)
 371 {
 372         unsigned long delay = 0;
 373
 374         delay = simple_strtoul(p, &p, 0);
 375
 376         switch (*p) {
 377         case 's':
 378         case 'S':
 379                 delay *= 1000000;
 380                 break;
 381         case 'm':
 382         case 'M':
 383                 delay *= 60 * 1000000;
 384         }
 385
 386         /* now wait for the requested amount of time */
 387         udelay(delay);
 388
 389         return 0;
 390 }
 391 early_param("ipldelay", early_parse_ipldelay);
 392
 393 static void __init
 394 setup_lowcore(void)
 395 {
 396         struct _lowcore *lc;
 397         int lc_pages;
 398
 399         /*
 400          * Setup lowcore for boot cpu
 401          */
 402         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 403         lc = (struct _lowcore *)
 404                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 405         memset(lc, 0, lc_pages * PAGE_SIZE);
 406         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 407         lc->restart_psw.addr =
 408                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 409         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 410         lc->external_new_psw.addr =
 411                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 412         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 413         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 414         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 415         lc->program_new_psw.addr =
 416                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 417         lc->mcck_new_psw.mask =
 418                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 419         lc->mcck_new_psw.addr =
 420                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 421         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 422         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 423         lc->ipl_device = S390_lowcore.ipl_device;
 424         lc->jiffy_timer = -1LL;
 425         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 426         lc->async_stack = (unsigned long)
 427                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 428         lc->panic_stack = (unsigned long)
 429                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 430         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 431         lc->thread_info = (unsigned long) &init_thread_union;
 432 #ifndef CONFIG_64BIT
 433         if (MACHINE_HAS_IEEE) {
 434                 lc->extended_save_area_addr = (__u32)
 435                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 436                 /* enable extended save area */
 437                 ctl_set_bit(14, 29);
 438         }
 439 #endif
 440         set_prefix((u32)(unsigned long) lc);
 441 }
 442
 443 static void __init
 444 setup_resources(void)
 445 {
 446         struct resource *res;
 447         int i;
 448
 449         code_resource.start = (unsigned long) &_text;
 450         code_resource.end = (unsigned long) &_etext - 1;
 451         data_resource.start = (unsigned long) &_etext;
 452         data_resource.end = (unsigned long) &_edata - 1;
 453
 454         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 455                 res = alloc_bootmem_low(sizeof(struct resource));
 456                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 457                 switch (memory_chunk[i].type) {
 458                 case CHUNK_READ_WRITE:
 459                         res->name = "System RAM";
 460                         break;
 461                 case CHUNK_READ_ONLY:
 462                         res->name = "System ROM";
 463                         res->flags |= IORESOURCE_READONLY;
 464                         break;
 465                 default:
 466                         res->name = "reserved";
 467                 }
 468                 res->start = memory_chunk[i].addr;
 469                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 470                 request_resource(&iomem_resource, res);
 471                 request_resource(res, &code_resource);
 472                 request_resource(res, &data_resource);
 473         }
 474 }
 475
 476 static void __init
 477 setup_memory(void)
 478 {
 479         unsigned long bootmap_size;
 480         unsigned long start_pfn, end_pfn, init_pfn;
 481         int i;
 482
 483         /*
 484          * partially used pages are not usable - thus
 485          * we are rounding upwards:
 486          */
 487         start_pfn = PFN_UP(__pa(&_end));
 488         end_pfn = max_pfn = PFN_DOWN(memory_end);
 489
 490         /* Initialize storage key for kernel pages */
 491         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 492                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 493
 494 #ifdef CONFIG_BLK_DEV_INITRD
 495         /*
 496          * Move the initrd in case the bitmap of the bootmem allocater
 497          * would overwrite it.
 498          */
 499
 500         if (INITRD_START && INITRD_SIZE) {
 501                 unsigned long bmap_size;
 502                 unsigned long start;
 503
 504                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 505                 bmap_size = PFN_PHYS(bmap_size);
 506
 507                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 508                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 509
 510                         if (start + INITRD_SIZE > memory_end) {
 511                                 printk("initrd extends beyond end of memory "
 512                                        "(0x%08lx > 0x%08lx)\n"
 513                                        "disabling initrd\n",
 514                                        start + INITRD_SIZE, memory_end);
 515                                 INITRD_START = INITRD_SIZE = 0;
 516                         } else {
 517                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 518                                        "size: %ld)\n",
 519                                        INITRD_START, start, INITRD_SIZE);
 520                                 memmove((void *) start, (void *) INITRD_START,
 521                                         INITRD_SIZE);
 522                                 INITRD_START = start;
 523                         }
 524                 }
 525         }
 526 #endif
 527
 528         /*
 529          * Initialize the boot-time allocator
 530          */
 531         bootmap_size = init_bootmem(start_pfn, end_pfn);
 532
 533         /*
 534          * Register RAM areas with the bootmem allocator.
 535          */
 536
 537         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 538                 unsigned long start_chunk, end_chunk, pfn;
 539
 540                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 541                         continue;
 542                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 543                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 544                 end_chunk = min(end_chunk, end_pfn);
 545                 if (start_chunk >= end_chunk)
 546                         continue;
 547                 add_active_range(0, start_chunk, end_chunk);
 548                 pfn = max(start_chunk, start_pfn);
 549                 for (; pfn <= end_chunk; pfn++)
 550                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 551         }
 552
 553         psw_set_key(PAGE_DEFAULT_KEY);
 554
 555         free_bootmem_with_active_regions(0, max_pfn);
 556         reserve_bootmem(0, PFN_PHYS(start_pfn));
 557
 558         /*
 559          * Reserve the bootmem bitmap itself as well. We do this in two
 560          * steps (first step was init_bootmem()) because this catches
 561          * the (very unlikely) case of us accidentally initializing the
 562          * bootmem allocator with an invalid RAM area.
 563          */
 564         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 565
 566 #ifdef CONFIG_BLK_DEV_INITRD
 567         if (INITRD_START && INITRD_SIZE) {
 568                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 569                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 570                         initrd_start = INITRD_START;
 571                         initrd_end = initrd_start + INITRD_SIZE;
 572                 } else {
 573                         printk("initrd extends beyond end of memory "
 574                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 575                                initrd_start + INITRD_SIZE, memory_end);
 576                         initrd_start = initrd_end = 0;
 577                 }
 578         }
 579 #endif
 580 }
 581
 582 /*
 583  * Setup function called from init/main.c just after the banner
 584  * was printed.
 585  */
 586
 587 void __init
 588 setup_arch(char **cmdline_p)
 589 {
 590         /*
 591          * print what head.S has found out about the machine
 592          */
 593 #ifndef CONFIG_64BIT
 594         printk((MACHINE_IS_VM) ?
 595                "We are running under VM (31 bit mode)\n" :
 596                "We are running native (31 bit mode)\n");
 597         printk((MACHINE_HAS_IEEE) ?
 598                "This machine has an IEEE fpu\n" :
 599                "This machine has no IEEE fpu\n");
 600 #else /* CONFIG_64BIT */
 601         printk((MACHINE_IS_VM) ?
 602                "We are running under VM (64 bit mode)\n" :
 603                "We are running native (64 bit mode)\n");
 604 #endif /* CONFIG_64BIT */
 605
 606         /* Save unparsed command line copy for /proc/cmdline */
 607         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 608
 609         *cmdline_p = COMMAND_LINE;
 610         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 611
 612         ROOT_DEV = Root_RAM0;
 613
 614         init_mm.start_code = PAGE_OFFSET;
 615         init_mm.end_code = (unsigned long) &_etext;
 616         init_mm.end_data = (unsigned long) &_edata;
 617         init_mm.brk = (unsigned long) &_end;
 618
 619         memory_end = memory_size;
 620
 621         if (MACHINE_HAS_MVCOS)
 622                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 623         else
 624                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 625
 626         parse_early_param();
 627
 628 #ifndef CONFIG_64BIT
 629         memory_end &= ~0x400000UL;
 630
 631         /*
 632          * We need some free virtual space to be able to do vmalloc.
 633          * On a machine with 2GB memory we make sure that we have at
 634          * least 128 MB free space for vmalloc.
 635          */
 636         if (memory_end > 1920*1024*1024)
 637                 memory_end = 1920*1024*1024;
 638 #else /* CONFIG_64BIT */
 639         memory_end &= ~0x200000UL;
 640 #endif /* CONFIG_64BIT */
 641
 642         setup_memory();
 643         setup_resources();
 644         setup_lowcore();
 645
 646         cpu_init();
 647         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 648         smp_setup_cpu_possible_map();
 649
 650         /*
 651          * Create kernel page tables and switch to virtual addressing.
 652          */
 653         paging_init();
 654
 655         /* Setup default console */
 656         conmode_default();
 657 }
 658
 659 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 660 {
 661    printk("cpu %d "
 662 #ifdef CONFIG_SMP
 663            "phys_idx=%d "
 664 #endif
 665            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 666            cpuinfo->cpu_nr,
 667 #ifdef CONFIG_SMP
 668            cpuinfo->cpu_addr,
 669 #endif
 670            cpuinfo->cpu_id.version,
 671            cpuinfo->cpu_id.ident,
 672            cpuinfo->cpu_id.machine,
 673            cpuinfo->cpu_id.unused);
 674 }
 675
 676 /*
 677  * show_cpuinfo - Get information on one CPU for use by procfs.
 678  */
 679
 680 static int show_cpuinfo(struct seq_file *m, void *v)
 681 {
 682         struct cpuinfo_S390 *cpuinfo;
 683         unsigned long n = (unsigned long) v - 1;
 684
 685         preempt_disable();
 686         if (!n) {
 687                 seq_printf(m, "vendor_id       : IBM/S390\n"
 688                                "# processors    : %i\n"
 689                                "bogomips per cpu: %lu.%02lu\n",
 690                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 691                                (loops_per_jiffy/(5000/HZ))%100);
 692         }
 693         if (cpu_online(n)) {
 694 #ifdef CONFIG_SMP
 695                 if (smp_processor_id() == n)
 696                         cpuinfo = &S390_lowcore.cpu_data;
 697                 else
 698                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 699 #else
 700                 cpuinfo = &S390_lowcore.cpu_data;
 701 #endif
 702                 seq_printf(m, "processor %li: "
 703                                "version = %02X,  "
 704                                "identification = %06X,  "
 705                                "machine = %04X\n",
 706                                n, cpuinfo->cpu_id.version,
 707                                cpuinfo->cpu_id.ident,
 708                                cpuinfo->cpu_id.machine);
 709         }
 710         preempt_enable();
 711         return 0;
 712 }
 713
 714 static void *c_start(struct seq_file *m, loff_t *pos)
 715 {
 716         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 717 }
 718 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 719 {
 720         ++*pos;
 721         return c_start(m, pos);
 722 }
 723 static void c_stop(struct seq_file *m, void *v)
 724 {
 725 }
 726 struct seq_operations cpuinfo_op = {
 727         .start  = c_start,
 728         .next   = c_next,
 729         .stop   = c_stop,
 730         .show   = show_cpuinfo,
 731 };
 732