arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/root_dev.h>
  35 #include <linux/console.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/device.h>
  39 #include <linux/notifier.h>
  40 #include <linux/pfn.h>
  41
  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 machine_flags = 0;
  66
  67 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  68 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  69 static unsigned long __initdata memory_end;
  70
  71 /*
  72  * This is set up by the setup-routine at boot-time
  73  * for S390 need to find out, what we have to setup
  74  * using address 0x10400 ...
  75  */
  76
  77 #include <asm/setup.h>
  78
  79 static struct resource code_resource = {
  80         .name  = "Kernel code",
  81         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  82 };
  83
  84 static struct resource data_resource = {
  85         .name = "Kernel data",
  86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 /*
  90  * cpu_init() initializes state that is per-CPU.
  91  */
  92 void __devinit cpu_init (void)
  93 {
  94         int addr = hard_smp_processor_id();
  95
  96         /*
  97          * Store processor id in lowcore (used e.g. in timer_interrupt)
  98          */
  99         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 100         S390_lowcore.cpu_data.cpu_addr = addr;
 101
 102         /*
 103          * Force FPU initialization:
 104          */
 105         clear_thread_flag(TIF_USEDFPU);
 106         clear_used_math();
 107
 108         atomic_inc(&init_mm.mm_count);
 109         current->active_mm = &init_mm;
 110         if (current->mm)
 111                 BUG();
 112         enter_lazy_tlb(&init_mm, current);
 113 }
 114
 115 /*
 116  * VM halt and poweroff setup routines
 117  */
 118 char vmhalt_cmd[128] = "";
 119 char vmpoff_cmd[128] = "";
 120 char vmpanic_cmd[128] = "";
 121
 122 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 123 {
 124         int sx, dx;
 125
 126         dx = 0;
 127         for (sx = 0; src[sx] != 0; sx++) {
 128                 if (src[sx] == '"') continue;
 129                 dst[dx++] = src[sx];
 130                 if (dx >= n) break;
 131         }
 132 }
 133
 134 static int __init vmhalt_setup(char *str)
 135 {
 136         strncpy_skip_quote(vmhalt_cmd, str, 127);
 137         vmhalt_cmd[127] = 0;
 138         return 1;
 139 }
 140
 141 __setup("vmhalt=", vmhalt_setup);
 142
 143 static int __init vmpoff_setup(char *str)
 144 {
 145         strncpy_skip_quote(vmpoff_cmd, str, 127);
 146         vmpoff_cmd[127] = 0;
 147         return 1;
 148 }
 149
 150 __setup("vmpoff=", vmpoff_setup);
 151
 152 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 153                           void *data)
 154 {
 155         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 156                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 157
 158         return NOTIFY_OK;
 159 }
 160
 161 #define PANIC_PRI_VMPANIC       0
 162
 163 static struct notifier_block vmpanic_nb = {
 164         .notifier_call = vmpanic_notify,
 165         .priority = PANIC_PRI_VMPANIC
 166 };
 167
 168 static int __init vmpanic_setup(char *str)
 169 {
 170         static int register_done __initdata = 0;
 171
 172         strncpy_skip_quote(vmpanic_cmd, str, 127);
 173         vmpanic_cmd[127] = 0;
 174         if (!register_done) {
 175                 register_done = 1;
 176                 atomic_notifier_chain_register(&panic_notifier_list,
 177                                                &vmpanic_nb);
 178         }
 179         return 1;
 180 }
 181
 182 __setup("vmpanic=", vmpanic_setup);
 183
 184 /*
 185  * condev= and conmode= setup parameter.
 186  */
 187
 188 static int __init condev_setup(char *str)
 189 {
 190         int vdev;
 191
 192         vdev = simple_strtoul(str, &str, 0);
 193         if (vdev >= 0 && vdev < 65536) {
 194                 console_devno = vdev;
 195                 console_irq = -1;
 196         }
 197         return 1;
 198 }
 199
 200 __setup("condev=", condev_setup);
 201
 202 static int __init conmode_setup(char *str)
 203 {
 204 #if defined(CONFIG_SCLP_CONSOLE)
 205         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 206                 SET_CONSOLE_SCLP;
 207 #endif
 208 #if defined(CONFIG_TN3215_CONSOLE)
 209         if (strncmp(str, "3215", 5) == 0)
 210                 SET_CONSOLE_3215;
 211 #endif
 212 #if defined(CONFIG_TN3270_CONSOLE)
 213         if (strncmp(str, "3270", 5) == 0)
 214                 SET_CONSOLE_3270;
 215 #endif
 216         return 1;
 217 }
 218
 219 __setup("conmode=", conmode_setup);
 220
 221 static void __init conmode_default(void)
 222 {
 223         char query_buffer[1024];
 224         char *ptr;
 225
 226         if (MACHINE_IS_VM) {
 227                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 228                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 229                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 230                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 231                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 232                 ptr = strstr(query_buffer, "CONMODE");
 233                 /*
 234                  * Set the conmode to 3215 so that the device recognition
 235                  * will set the cu_type of the console to 3215. If the
 236                  * conmode is 3270 and we don't set it back then both
 237                  * 3215 and the 3270 driver will try to access the console
 238                  * device (3215 as console and 3270 as normal tty).
 239                  */
 240                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 241                 if (ptr == NULL) {
 242 #if defined(CONFIG_SCLP_CONSOLE)
 243                         SET_CONSOLE_SCLP;
 244 #endif
 245                         return;
 246                 }
 247                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 248 #if defined(CONFIG_TN3270_CONSOLE)
 249                         SET_CONSOLE_3270;
 250 #elif defined(CONFIG_TN3215_CONSOLE)
 251                         SET_CONSOLE_3215;
 252 #elif defined(CONFIG_SCLP_CONSOLE)
 253                         SET_CONSOLE_SCLP;
 254 #endif
 255                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 256 #if defined(CONFIG_TN3215_CONSOLE)
 257                         SET_CONSOLE_3215;
 258 #elif defined(CONFIG_TN3270_CONSOLE)
 259                         SET_CONSOLE_3270;
 260 #elif defined(CONFIG_SCLP_CONSOLE)
 261                         SET_CONSOLE_SCLP;
 262 #endif
 263                 }
 264         } else if (MACHINE_IS_P390) {
 265 #if defined(CONFIG_TN3215_CONSOLE)
 266                 SET_CONSOLE_3215;
 267 #elif defined(CONFIG_TN3270_CONSOLE)
 268                 SET_CONSOLE_3270;
 269 #endif
 270         } else {
 271 #if defined(CONFIG_SCLP_CONSOLE)
 272                 SET_CONSOLE_SCLP;
 273 #endif
 274         }
 275 }
 276
 277 #ifdef CONFIG_SMP
 278 extern void machine_restart_smp(char *);
 279 extern void machine_halt_smp(void);
 280 extern void machine_power_off_smp(void);
 281
 282 void (*_machine_restart)(char *command) = machine_restart_smp;
 283 void (*_machine_halt)(void) = machine_halt_smp;
 284 void (*_machine_power_off)(void) = machine_power_off_smp;
 285 #else
 286 /*
 287  * Reboot, halt and power_off routines for non SMP.
 288  */
 289 static void do_machine_restart_nonsmp(char * __unused)
 290 {
 291         do_reipl();
 292 }
 293
 294 static void do_machine_halt_nonsmp(void)
 295 {
 296         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 297                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 298         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 299 }
 300
 301 static void do_machine_power_off_nonsmp(void)
 302 {
 303         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 304                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 305         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 306 }
 307
 308 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 309 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 310 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 311 #endif
 312
 313  /*
 314  * Reboot, halt and power_off stubs. They just call _machine_restart,
 315  * _machine_halt or _machine_power_off.
 316  */
 317
 318 void machine_restart(char *command)
 319 {
 320         if (!in_interrupt() || oops_in_progress)
 321                 /*
 322                  * Only unblank the console if we are called in enabled
 323                  * context or a bust_spinlocks cleared the way for us.
 324                  */
 325                 console_unblank();
 326         _machine_restart(command);
 327 }
 328
 329 void machine_halt(void)
 330 {
 331         if (!in_interrupt() || oops_in_progress)
 332                 /*
 333                  * Only unblank the console if we are called in enabled
 334                  * context or a bust_spinlocks cleared the way for us.
 335                  */
 336                 console_unblank();
 337         _machine_halt();
 338 }
 339
 340 void machine_power_off(void)
 341 {
 342         if (!in_interrupt() || oops_in_progress)
 343                 /*
 344                  * Only unblank the console if we are called in enabled
 345                  * context or a bust_spinlocks cleared the way for us.
 346                  */
 347                 console_unblank();
 348         _machine_power_off();
 349 }
 350
 351 /*
 352  * Dummy power off function.
 353  */
 354 void (*pm_power_off)(void) = machine_power_off;
 355
 356 static int __init early_parse_mem(char *p)
 357 {
 358         memory_end = memparse(p, &p);
 359         return 0;
 360 }
 361 early_param("mem", early_parse_mem);
 362
 363 /*
 364  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 365  */
 366 static int __init early_parse_ipldelay(char *p)
 367 {
 368         unsigned long delay = 0;
 369
 370         delay = simple_strtoul(p, &p, 0);
 371
 372         switch (*p) {
 373         case 's':
 374         case 'S':
 375                 delay *= 1000000;
 376                 break;
 377         case 'm':
 378         case 'M':
 379                 delay *= 60 * 1000000;
 380         }
 381
 382         /* now wait for the requested amount of time */
 383         udelay(delay);
 384
 385         return 0;
 386 }
 387 early_param("ipldelay", early_parse_ipldelay);
 388
 389 static void __init
 390 setup_lowcore(void)
 391 {
 392         struct _lowcore *lc;
 393         int lc_pages;
 394
 395         /*
 396          * Setup lowcore for boot cpu
 397          */
 398         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 399         lc = (struct _lowcore *)
 400                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 401         memset(lc, 0, lc_pages * PAGE_SIZE);
 402         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 403         lc->restart_psw.addr =
 404                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 405         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 406         lc->external_new_psw.addr =
 407                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 408         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 409         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 410         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 411         lc->program_new_psw.addr =
 412                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 413         lc->mcck_new_psw.mask =
 414                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 415         lc->mcck_new_psw.addr =
 416                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 417         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 418         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 419         lc->ipl_device = S390_lowcore.ipl_device;
 420         lc->jiffy_timer = -1LL;
 421         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 422         lc->async_stack = (unsigned long)
 423                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 424         lc->panic_stack = (unsigned long)
 425                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 426         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 427         lc->thread_info = (unsigned long) &init_thread_union;
 428 #ifndef CONFIG_64BIT
 429         if (MACHINE_HAS_IEEE) {
 430                 lc->extended_save_area_addr = (__u32)
 431                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 432                 /* enable extended save area */
 433                 __ctl_set_bit(14, 29);
 434         }
 435 #endif
 436         set_prefix((u32)(unsigned long) lc);
 437 }
 438
 439 static void __init
 440 setup_resources(void)
 441 {
 442         struct resource *res;
 443         int i;
 444
 445         code_resource.start = (unsigned long) &_text;
 446         code_resource.end = (unsigned long) &_etext - 1;
 447         data_resource.start = (unsigned long) &_etext;
 448         data_resource.end = (unsigned long) &_edata - 1;
 449
 450         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 451                 res = alloc_bootmem_low(sizeof(struct resource));
 452                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 453                 switch (memory_chunk[i].type) {
 454                 case CHUNK_READ_WRITE:
 455                         res->name = "System RAM";
 456                         break;
 457                 case CHUNK_READ_ONLY:
 458                         res->name = "System ROM";
 459                         res->flags |= IORESOURCE_READONLY;
 460                         break;
 461                 default:
 462                         res->name = "reserved";
 463                 }
 464                 res->start = memory_chunk[i].addr;
 465                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 466                 request_resource(&iomem_resource, res);
 467                 request_resource(res, &code_resource);
 468                 request_resource(res, &data_resource);
 469         }
 470 }
 471
 472 static void __init setup_memory_end(void)
 473 {
 474         unsigned long real_size, memory_size;
 475         unsigned long max_mem, max_phys;
 476         int i;
 477
 478         memory_size = real_size = 0;
 479         max_phys = VMALLOC_END - VMALLOC_MIN_SIZE;
 480         memory_end &= PAGE_MASK;
 481
 482         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 483
 484         for (i = 0; i < MEMORY_CHUNKS; i++) {
 485                 struct mem_chunk *chunk = &memory_chunk[i];
 486
 487                 real_size = max(real_size, chunk->addr + chunk->size);
 488                 if (chunk->addr >= max_mem) {
 489                         memset(chunk, 0, sizeof(*chunk));
 490                         continue;
 491                 }
 492                 if (chunk->addr + chunk->size > max_mem)
 493                         chunk->size = max_mem - chunk->addr;
 494                 memory_size = max(memory_size, chunk->addr + chunk->size);
 495         }
 496         if (!memory_end)
 497                 memory_end = memory_size;
 498         if (real_size > memory_end)
 499                 printk("More memory detected than supported. Unused: %luk\n",
 500                        (real_size - memory_end) >> 10);
 501 }
 502
 503 static void __init
 504 setup_memory(void)
 505 {
 506         unsigned long bootmap_size;
 507         unsigned long start_pfn, end_pfn, init_pfn;
 508         int i;
 509
 510         /*
 511          * partially used pages are not usable - thus
 512          * we are rounding upwards:
 513          */
 514         start_pfn = PFN_UP(__pa(&_end));
 515         end_pfn = max_pfn = PFN_DOWN(memory_end);
 516
 517         /* Initialize storage key for kernel pages */
 518         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 519                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 520
 521 #ifdef CONFIG_BLK_DEV_INITRD
 522         /*
 523          * Move the initrd in case the bitmap of the bootmem allocater
 524          * would overwrite it.
 525          */
 526
 527         if (INITRD_START && INITRD_SIZE) {
 528                 unsigned long bmap_size;
 529                 unsigned long start;
 530
 531                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 532                 bmap_size = PFN_PHYS(bmap_size);
 533
 534                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 535                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 536
 537                         if (start + INITRD_SIZE > memory_end) {
 538                                 printk("initrd extends beyond end of memory "
 539                                        "(0x%08lx > 0x%08lx)\n"
 540                                        "disabling initrd\n",
 541                                        start + INITRD_SIZE, memory_end);
 542                                 INITRD_START = INITRD_SIZE = 0;
 543                         } else {
 544                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 545                                        "size: %ld)\n",
 546                                        INITRD_START, start, INITRD_SIZE);
 547                                 memmove((void *) start, (void *) INITRD_START,
 548                                         INITRD_SIZE);
 549                                 INITRD_START = start;
 550                         }
 551                 }
 552         }
 553 #endif
 554
 555         /*
 556          * Initialize the boot-time allocator
 557          */
 558         bootmap_size = init_bootmem(start_pfn, end_pfn);
 559
 560         /*
 561          * Register RAM areas with the bootmem allocator.
 562          */
 563
 564         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 565                 unsigned long start_chunk, end_chunk, pfn;
 566
 567                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 568                         continue;
 569                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 570                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 571                 end_chunk = min(end_chunk, end_pfn);
 572                 if (start_chunk >= end_chunk)
 573                         continue;
 574                 add_active_range(0, start_chunk, end_chunk);
 575                 pfn = max(start_chunk, start_pfn);
 576                 for (; pfn <= end_chunk; pfn++)
 577                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 578         }
 579
 580         psw_set_key(PAGE_DEFAULT_KEY);
 581
 582         free_bootmem_with_active_regions(0, max_pfn);
 583         reserve_bootmem(0, PFN_PHYS(start_pfn));
 584
 585         /*
 586          * Reserve the bootmem bitmap itself as well. We do this in two
 587          * steps (first step was init_bootmem()) because this catches
 588          * the (very unlikely) case of us accidentally initializing the
 589          * bootmem allocator with an invalid RAM area.
 590          */
 591         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 592
 593 #ifdef CONFIG_BLK_DEV_INITRD
 594         if (INITRD_START && INITRD_SIZE) {
 595                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 596                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 597                         initrd_start = INITRD_START;
 598                         initrd_end = initrd_start + INITRD_SIZE;
 599                 } else {
 600                         printk("initrd extends beyond end of memory "
 601                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 602                                initrd_start + INITRD_SIZE, memory_end);
 603                         initrd_start = initrd_end = 0;
 604                 }
 605         }
 606 #endif
 607 }
 608
 609 /*
 610  * Setup function called from init/main.c just after the banner
 611  * was printed.
 612  */
 613
 614 void __init
 615 setup_arch(char **cmdline_p)
 616 {
 617         /*
 618          * print what head.S has found out about the machine
 619          */
 620 #ifndef CONFIG_64BIT
 621         printk((MACHINE_IS_VM) ?
 622                "We are running under VM (31 bit mode)\n" :
 623                "We are running native (31 bit mode)\n");
 624         printk((MACHINE_HAS_IEEE) ?
 625                "This machine has an IEEE fpu\n" :
 626                "This machine has no IEEE fpu\n");
 627 #else /* CONFIG_64BIT */
 628         printk((MACHINE_IS_VM) ?
 629                "We are running under VM (64 bit mode)\n" :
 630                "We are running native (64 bit mode)\n");
 631 #endif /* CONFIG_64BIT */
 632
 633         /* Save unparsed command line copy for /proc/cmdline */
 634         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 635
 636         *cmdline_p = COMMAND_LINE;
 637         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 638
 639         ROOT_DEV = Root_RAM0;
 640
 641         init_mm.start_code = PAGE_OFFSET;
 642         init_mm.end_code = (unsigned long) &_etext;
 643         init_mm.end_data = (unsigned long) &_edata;
 644         init_mm.brk = (unsigned long) &_end;
 645
 646         if (MACHINE_HAS_MVCOS)
 647                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 648         else
 649                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 650
 651         parse_early_param();
 652
 653         setup_memory_end();
 654         setup_memory();
 655         setup_resources();
 656         setup_lowcore();
 657
 658         cpu_init();
 659         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 660         smp_setup_cpu_possible_map();
 661
 662         /*
 663          * Create kernel page tables and switch to virtual addressing.
 664          */
 665         paging_init();
 666
 667         /* Setup default console */
 668         conmode_default();
 669 }
 670
 671 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 672 {
 673    printk("cpu %d "
 674 #ifdef CONFIG_SMP
 675            "phys_idx=%d "
 676 #endif
 677            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 678            cpuinfo->cpu_nr,
 679 #ifdef CONFIG_SMP
 680            cpuinfo->cpu_addr,
 681 #endif
 682            cpuinfo->cpu_id.version,
 683            cpuinfo->cpu_id.ident,
 684            cpuinfo->cpu_id.machine,
 685            cpuinfo->cpu_id.unused);
 686 }
 687
 688 /*
 689  * show_cpuinfo - Get information on one CPU for use by procfs.
 690  */
 691
 692 static int show_cpuinfo(struct seq_file *m, void *v)
 693 {
 694         struct cpuinfo_S390 *cpuinfo;
 695         unsigned long n = (unsigned long) v - 1;
 696
 697         preempt_disable();
 698         if (!n) {
 699                 seq_printf(m, "vendor_id       : IBM/S390\n"
 700                                "# processors    : %i\n"
 701                                "bogomips per cpu: %lu.%02lu\n",
 702                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 703                                (loops_per_jiffy/(5000/HZ))%100);
 704         }
 705         if (cpu_online(n)) {
 706 #ifdef CONFIG_SMP
 707                 if (smp_processor_id() == n)
 708                         cpuinfo = &S390_lowcore.cpu_data;
 709                 else
 710                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 711 #else
 712                 cpuinfo = &S390_lowcore.cpu_data;
 713 #endif
 714                 seq_printf(m, "processor %li: "
 715                                "version = %02X,  "
 716                                "identification = %06X,  "
 717                                "machine = %04X\n",
 718                                n, cpuinfo->cpu_id.version,
 719                                cpuinfo->cpu_id.ident,
 720                                cpuinfo->cpu_id.machine);
 721         }
 722         preempt_enable();
 723         return 0;
 724 }
 725
 726 static void *c_start(struct seq_file *m, loff_t *pos)
 727 {
 728         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 729 }
 730 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 731 {
 732         ++*pos;
 733         return c_start(m, pos);
 734 }
 735 static void c_stop(struct seq_file *m, void *v)
 736 {
 737 }
 738 struct seq_operations cpuinfo_op = {
 739         .start  = c_start,
 740         .next   = c_next,
 741         .stop   = c_stop,
 742         .show   = show_cpuinfo,
 743 };
 744