arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/root_dev.h>
  35 #include <linux/console.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/device.h>
  39 #include <linux/notifier.h>
  40 #include <linux/pfn.h>
  41 #include <linux/reboot.h>
  42
  43 #include <asm/uaccess.h>
  44 #include <asm/system.h>
  45 #include <asm/smp.h>
  46 #include <asm/mmu_context.h>
  47 #include <asm/cpcmd.h>
  48 #include <asm/lowcore.h>
  49 #include <asm/irq.h>
  50 #include <asm/page.h>
  51 #include <asm/ptrace.h>
  52 #include <asm/sections.h>
  53
  54 /*
  55  * User copy operations.
  56  */
  57 struct uaccess_ops uaccess;
  58 EXPORT_SYMBOL_GPL(uaccess);
  59
  60 /*
  61  * Machine setup..
  62  */
  63 unsigned int console_mode = 0;
  64 unsigned int console_devno = -1;
  65 unsigned int console_irq = -1;
  66 unsigned long machine_flags = 0;
  67
  68 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  69 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  70 static unsigned long __initdata memory_end;
  71
  72 /*
  73  * This is set up by the setup-routine at boot-time
  74  * for S390 need to find out, what we have to setup
  75  * using address 0x10400 ...
  76  */
  77
  78 #include <asm/setup.h>
  79
  80 static struct resource code_resource = {
  81         .name  = "Kernel code",
  82         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  83 };
  84
  85 static struct resource data_resource = {
  86         .name = "Kernel data",
  87         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  88 };
  89
  90 /*
  91  * cpu_init() initializes state that is per-CPU.
  92  */
  93 void __devinit cpu_init (void)
  94 {
  95         int addr = hard_smp_processor_id();
  96
  97         /*
  98          * Store processor id in lowcore (used e.g. in timer_interrupt)
  99          */
 100         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 101         S390_lowcore.cpu_data.cpu_addr = addr;
 102
 103         /*
 104          * Force FPU initialization:
 105          */
 106         clear_thread_flag(TIF_USEDFPU);
 107         clear_used_math();
 108
 109         atomic_inc(&init_mm.mm_count);
 110         current->active_mm = &init_mm;
 111         if (current->mm)
 112                 BUG();
 113         enter_lazy_tlb(&init_mm, current);
 114 }
 115
 116 /*
 117  * VM halt and poweroff setup routines
 118  */
 119 char vmhalt_cmd[128] = "";
 120 char vmpoff_cmd[128] = "";
 121 static char vmpanic_cmd[128] = "";
 122
 123 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 124 {
 125         int sx, dx;
 126
 127         dx = 0;
 128         for (sx = 0; src[sx] != 0; sx++) {
 129                 if (src[sx] == '"') continue;
 130                 dst[dx++] = src[sx];
 131                 if (dx >= n) break;
 132         }
 133 }
 134
 135 static int __init vmhalt_setup(char *str)
 136 {
 137         strncpy_skip_quote(vmhalt_cmd, str, 127);
 138         vmhalt_cmd[127] = 0;
 139         return 1;
 140 }
 141
 142 __setup("vmhalt=", vmhalt_setup);
 143
 144 static int __init vmpoff_setup(char *str)
 145 {
 146         strncpy_skip_quote(vmpoff_cmd, str, 127);
 147         vmpoff_cmd[127] = 0;
 148         return 1;
 149 }
 150
 151 __setup("vmpoff=", vmpoff_setup);
 152
 153 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 154                           void *data)
 155 {
 156         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 157                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 158
 159         return NOTIFY_OK;
 160 }
 161
 162 #define PANIC_PRI_VMPANIC       0
 163
 164 static struct notifier_block vmpanic_nb = {
 165         .notifier_call = vmpanic_notify,
 166         .priority = PANIC_PRI_VMPANIC
 167 };
 168
 169 static int __init vmpanic_setup(char *str)
 170 {
 171         static int register_done __initdata = 0;
 172
 173         strncpy_skip_quote(vmpanic_cmd, str, 127);
 174         vmpanic_cmd[127] = 0;
 175         if (!register_done) {
 176                 register_done = 1;
 177                 atomic_notifier_chain_register(&panic_notifier_list,
 178                                                &vmpanic_nb);
 179         }
 180         return 1;
 181 }
 182
 183 __setup("vmpanic=", vmpanic_setup);
 184
 185 /*
 186  * condev= and conmode= setup parameter.
 187  */
 188
 189 static int __init condev_setup(char *str)
 190 {
 191         int vdev;
 192
 193         vdev = simple_strtoul(str, &str, 0);
 194         if (vdev >= 0 && vdev < 65536) {
 195                 console_devno = vdev;
 196                 console_irq = -1;
 197         }
 198         return 1;
 199 }
 200
 201 __setup("condev=", condev_setup);
 202
 203 static int __init conmode_setup(char *str)
 204 {
 205 #if defined(CONFIG_SCLP_CONSOLE)
 206         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 207                 SET_CONSOLE_SCLP;
 208 #endif
 209 #if defined(CONFIG_TN3215_CONSOLE)
 210         if (strncmp(str, "3215", 5) == 0)
 211                 SET_CONSOLE_3215;
 212 #endif
 213 #if defined(CONFIG_TN3270_CONSOLE)
 214         if (strncmp(str, "3270", 5) == 0)
 215                 SET_CONSOLE_3270;
 216 #endif
 217         return 1;
 218 }
 219
 220 __setup("conmode=", conmode_setup);
 221
 222 static void __init conmode_default(void)
 223 {
 224         char query_buffer[1024];
 225         char *ptr;
 226
 227         if (MACHINE_IS_VM) {
 228                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 229                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 230                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 231                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 232                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 233                 ptr = strstr(query_buffer, "CONMODE");
 234                 /*
 235                  * Set the conmode to 3215 so that the device recognition
 236                  * will set the cu_type of the console to 3215. If the
 237                  * conmode is 3270 and we don't set it back then both
 238                  * 3215 and the 3270 driver will try to access the console
 239                  * device (3215 as console and 3270 as normal tty).
 240                  */
 241                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 242                 if (ptr == NULL) {
 243 #if defined(CONFIG_SCLP_CONSOLE)
 244                         SET_CONSOLE_SCLP;
 245 #endif
 246                         return;
 247                 }
 248                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 249 #if defined(CONFIG_TN3270_CONSOLE)
 250                         SET_CONSOLE_3270;
 251 #elif defined(CONFIG_TN3215_CONSOLE)
 252                         SET_CONSOLE_3215;
 253 #elif defined(CONFIG_SCLP_CONSOLE)
 254                         SET_CONSOLE_SCLP;
 255 #endif
 256                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 257 #if defined(CONFIG_TN3215_CONSOLE)
 258                         SET_CONSOLE_3215;
 259 #elif defined(CONFIG_TN3270_CONSOLE)
 260                         SET_CONSOLE_3270;
 261 #elif defined(CONFIG_SCLP_CONSOLE)
 262                         SET_CONSOLE_SCLP;
 263 #endif
 264                 }
 265         } else if (MACHINE_IS_P390) {
 266 #if defined(CONFIG_TN3215_CONSOLE)
 267                 SET_CONSOLE_3215;
 268 #elif defined(CONFIG_TN3270_CONSOLE)
 269                 SET_CONSOLE_3270;
 270 #endif
 271         } else {
 272 #if defined(CONFIG_SCLP_CONSOLE)
 273                 SET_CONSOLE_SCLP;
 274 #endif
 275         }
 276 }
 277
 278 #ifdef CONFIG_SMP
 279 void (*_machine_restart)(char *command) = machine_restart_smp;
 280 void (*_machine_halt)(void) = machine_halt_smp;
 281 void (*_machine_power_off)(void) = machine_power_off_smp;
 282 #else
 283 /*
 284  * Reboot, halt and power_off routines for non SMP.
 285  */
 286 static void do_machine_restart_nonsmp(char * __unused)
 287 {
 288         do_reipl();
 289 }
 290
 291 static void do_machine_halt_nonsmp(void)
 292 {
 293         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 294                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 295         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 296 }
 297
 298 static void do_machine_power_off_nonsmp(void)
 299 {
 300         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 301                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 302         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 303 }
 304
 305 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 306 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 307 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 308 #endif
 309
 310  /*
 311  * Reboot, halt and power_off stubs. They just call _machine_restart,
 312  * _machine_halt or _machine_power_off.
 313  */
 314
 315 void machine_restart(char *command)
 316 {
 317         if (!in_interrupt() || oops_in_progress)
 318                 /*
 319                  * Only unblank the console if we are called in enabled
 320                  * context or a bust_spinlocks cleared the way for us.
 321                  */
 322                 console_unblank();
 323         _machine_restart(command);
 324 }
 325
 326 void machine_halt(void)
 327 {
 328         if (!in_interrupt() || oops_in_progress)
 329                 /*
 330                  * Only unblank the console if we are called in enabled
 331                  * context or a bust_spinlocks cleared the way for us.
 332                  */
 333                 console_unblank();
 334         _machine_halt();
 335 }
 336
 337 void machine_power_off(void)
 338 {
 339         if (!in_interrupt() || oops_in_progress)
 340                 /*
 341                  * Only unblank the console if we are called in enabled
 342                  * context or a bust_spinlocks cleared the way for us.
 343                  */
 344                 console_unblank();
 345         _machine_power_off();
 346 }
 347
 348 /*
 349  * Dummy power off function.
 350  */
 351 void (*pm_power_off)(void) = machine_power_off;
 352
 353 static int __init early_parse_mem(char *p)
 354 {
 355         memory_end = memparse(p, &p);
 356         return 0;
 357 }
 358 early_param("mem", early_parse_mem);
 359
 360 /*
 361  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 362  */
 363 static int __init early_parse_ipldelay(char *p)
 364 {
 365         unsigned long delay = 0;
 366
 367         delay = simple_strtoul(p, &p, 0);
 368
 369         switch (*p) {
 370         case 's':
 371         case 'S':
 372                 delay *= 1000000;
 373                 break;
 374         case 'm':
 375         case 'M':
 376                 delay *= 60 * 1000000;
 377         }
 378
 379         /* now wait for the requested amount of time */
 380         udelay(delay);
 381
 382         return 0;
 383 }
 384 early_param("ipldelay", early_parse_ipldelay);
 385
 386 static void __init
 387 setup_lowcore(void)
 388 {
 389         struct _lowcore *lc;
 390         int lc_pages;
 391
 392         /*
 393          * Setup lowcore for boot cpu
 394          */
 395         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 396         lc = (struct _lowcore *)
 397                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 398         memset(lc, 0, lc_pages * PAGE_SIZE);
 399         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 400         lc->restart_psw.addr =
 401                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 402         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 403         lc->external_new_psw.addr =
 404                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 405         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 406         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 407         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 408         lc->program_new_psw.addr =
 409                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 410         lc->mcck_new_psw.mask =
 411                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 412         lc->mcck_new_psw.addr =
 413                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 414         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 415         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 416         lc->ipl_device = S390_lowcore.ipl_device;
 417         lc->jiffy_timer = -1LL;
 418         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 419         lc->async_stack = (unsigned long)
 420                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 421         lc->panic_stack = (unsigned long)
 422                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 423         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 424         lc->thread_info = (unsigned long) &init_thread_union;
 425 #ifndef CONFIG_64BIT
 426         if (MACHINE_HAS_IEEE) {
 427                 lc->extended_save_area_addr = (__u32)
 428                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 429                 /* enable extended save area */
 430                 __ctl_set_bit(14, 29);
 431         }
 432 #endif
 433         set_prefix((u32)(unsigned long) lc);
 434 }
 435
 436 static void __init
 437 setup_resources(void)
 438 {
 439         struct resource *res;
 440         int i;
 441
 442         code_resource.start = (unsigned long) &_text;
 443         code_resource.end = (unsigned long) &_etext - 1;
 444         data_resource.start = (unsigned long) &_etext;
 445         data_resource.end = (unsigned long) &_edata - 1;
 446
 447         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 448                 res = alloc_bootmem_low(sizeof(struct resource));
 449                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 450                 switch (memory_chunk[i].type) {
 451                 case CHUNK_READ_WRITE:
 452                         res->name = "System RAM";
 453                         break;
 454                 case CHUNK_READ_ONLY:
 455                         res->name = "System ROM";
 456                         res->flags |= IORESOURCE_READONLY;
 457                         break;
 458                 default:
 459                         res->name = "reserved";
 460                 }
 461                 res->start = memory_chunk[i].addr;
 462                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 463                 request_resource(&iomem_resource, res);
 464                 request_resource(res, &code_resource);
 465                 request_resource(res, &data_resource);
 466         }
 467 }
 468
 469 static void __init setup_memory_end(void)
 470 {
 471         unsigned long real_size, memory_size;
 472         unsigned long max_mem, max_phys;
 473         int i;
 474
 475         memory_size = real_size = 0;
 476         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 477         memory_end &= PAGE_MASK;
 478
 479         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 480
 481         for (i = 0; i < MEMORY_CHUNKS; i++) {
 482                 struct mem_chunk *chunk = &memory_chunk[i];
 483
 484                 real_size = max(real_size, chunk->addr + chunk->size);
 485                 if (chunk->addr >= max_mem) {
 486                         memset(chunk, 0, sizeof(*chunk));
 487                         continue;
 488                 }
 489                 if (chunk->addr + chunk->size > max_mem)
 490                         chunk->size = max_mem - chunk->addr;
 491                 memory_size = max(memory_size, chunk->addr + chunk->size);
 492         }
 493         if (!memory_end)
 494                 memory_end = memory_size;
 495         if (real_size > memory_end)
 496                 printk("More memory detected than supported. Unused: %luk\n",
 497                        (real_size - memory_end) >> 10);
 498 }
 499
 500 static void __init
 501 setup_memory(void)
 502 {
 503         unsigned long bootmap_size;
 504         unsigned long start_pfn, end_pfn, init_pfn;
 505         int i;
 506
 507         /*
 508          * partially used pages are not usable - thus
 509          * we are rounding upwards:
 510          */
 511         start_pfn = PFN_UP(__pa(&_end));
 512         end_pfn = max_pfn = PFN_DOWN(memory_end);
 513
 514         /* Initialize storage key for kernel pages */
 515         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 516                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 517
 518 #ifdef CONFIG_BLK_DEV_INITRD
 519         /*
 520          * Move the initrd in case the bitmap of the bootmem allocater
 521          * would overwrite it.
 522          */
 523
 524         if (INITRD_START && INITRD_SIZE) {
 525                 unsigned long bmap_size;
 526                 unsigned long start;
 527
 528                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 529                 bmap_size = PFN_PHYS(bmap_size);
 530
 531                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 532                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 533
 534                         if (start + INITRD_SIZE > memory_end) {
 535                                 printk("initrd extends beyond end of memory "
 536                                        "(0x%08lx > 0x%08lx)\n"
 537                                        "disabling initrd\n",
 538                                        start + INITRD_SIZE, memory_end);
 539                                 INITRD_START = INITRD_SIZE = 0;
 540                         } else {
 541                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 542                                        "size: %ld)\n",
 543                                        INITRD_START, start, INITRD_SIZE);
 544                                 memmove((void *) start, (void *) INITRD_START,
 545                                         INITRD_SIZE);
 546                                 INITRD_START = start;
 547                         }
 548                 }
 549         }
 550 #endif
 551
 552         /*
 553          * Initialize the boot-time allocator
 554          */
 555         bootmap_size = init_bootmem(start_pfn, end_pfn);
 556
 557         /*
 558          * Register RAM areas with the bootmem allocator.
 559          */
 560
 561         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 562                 unsigned long start_chunk, end_chunk, pfn;
 563
 564                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 565                         continue;
 566                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 567                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 568                 end_chunk = min(end_chunk, end_pfn);
 569                 if (start_chunk >= end_chunk)
 570                         continue;
 571                 add_active_range(0, start_chunk, end_chunk);
 572                 pfn = max(start_chunk, start_pfn);
 573                 for (; pfn <= end_chunk; pfn++)
 574                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 575         }
 576
 577         psw_set_key(PAGE_DEFAULT_KEY);
 578
 579         free_bootmem_with_active_regions(0, max_pfn);
 580         reserve_bootmem(0, PFN_PHYS(start_pfn));
 581
 582         /*
 583          * Reserve the bootmem bitmap itself as well. We do this in two
 584          * steps (first step was init_bootmem()) because this catches
 585          * the (very unlikely) case of us accidentally initializing the
 586          * bootmem allocator with an invalid RAM area.
 587          */
 588         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 589
 590 #ifdef CONFIG_BLK_DEV_INITRD
 591         if (INITRD_START && INITRD_SIZE) {
 592                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 593                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 594                         initrd_start = INITRD_START;
 595                         initrd_end = initrd_start + INITRD_SIZE;
 596                 } else {
 597                         printk("initrd extends beyond end of memory "
 598                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 599                                initrd_start + INITRD_SIZE, memory_end);
 600                         initrd_start = initrd_end = 0;
 601                 }
 602         }
 603 #endif
 604 }
 605
 606 /*
 607  * Setup function called from init/main.c just after the banner
 608  * was printed.
 609  */
 610
 611 void __init
 612 setup_arch(char **cmdline_p)
 613 {
 614         /*
 615          * print what head.S has found out about the machine
 616          */
 617 #ifndef CONFIG_64BIT
 618         printk((MACHINE_IS_VM) ?
 619                "We are running under VM (31 bit mode)\n" :
 620                "We are running native (31 bit mode)\n");
 621         printk((MACHINE_HAS_IEEE) ?
 622                "This machine has an IEEE fpu\n" :
 623                "This machine has no IEEE fpu\n");
 624 #else /* CONFIG_64BIT */
 625         printk((MACHINE_IS_VM) ?
 626                "We are running under VM (64 bit mode)\n" :
 627                "We are running native (64 bit mode)\n");
 628 #endif /* CONFIG_64BIT */
 629
 630         /* Save unparsed command line copy for /proc/cmdline */
 631         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 632
 633         *cmdline_p = COMMAND_LINE;
 634         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 635
 636         ROOT_DEV = Root_RAM0;
 637
 638         init_mm.start_code = PAGE_OFFSET;
 639         init_mm.end_code = (unsigned long) &_etext;
 640         init_mm.end_data = (unsigned long) &_edata;
 641         init_mm.brk = (unsigned long) &_end;
 642
 643         if (MACHINE_HAS_MVCOS)
 644                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 645         else
 646                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 647
 648         parse_early_param();
 649
 650         setup_memory_end();
 651         setup_memory();
 652         setup_resources();
 653         setup_lowcore();
 654
 655         cpu_init();
 656         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 657         smp_setup_cpu_possible_map();
 658
 659         /*
 660          * Create kernel page tables and switch to virtual addressing.
 661          */
 662         paging_init();
 663
 664         /* Setup default console */
 665         conmode_default();
 666 }
 667
 668 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 669 {
 670    printk("cpu %d "
 671 #ifdef CONFIG_SMP
 672            "phys_idx=%d "
 673 #endif
 674            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 675            cpuinfo->cpu_nr,
 676 #ifdef CONFIG_SMP
 677            cpuinfo->cpu_addr,
 678 #endif
 679            cpuinfo->cpu_id.version,
 680            cpuinfo->cpu_id.ident,
 681            cpuinfo->cpu_id.machine,
 682            cpuinfo->cpu_id.unused);
 683 }
 684
 685 /*
 686  * show_cpuinfo - Get information on one CPU for use by procfs.
 687  */
 688
 689 static int show_cpuinfo(struct seq_file *m, void *v)
 690 {
 691         struct cpuinfo_S390 *cpuinfo;
 692         unsigned long n = (unsigned long) v - 1;
 693
 694         preempt_disable();
 695         if (!n) {
 696                 seq_printf(m, "vendor_id       : IBM/S390\n"
 697                                "# processors    : %i\n"
 698                                "bogomips per cpu: %lu.%02lu\n",
 699                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 700                                (loops_per_jiffy/(5000/HZ))%100);
 701         }
 702         if (cpu_online(n)) {
 703 #ifdef CONFIG_SMP
 704                 if (smp_processor_id() == n)
 705                         cpuinfo = &S390_lowcore.cpu_data;
 706                 else
 707                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 708 #else
 709                 cpuinfo = &S390_lowcore.cpu_data;
 710 #endif
 711                 seq_printf(m, "processor %li: "
 712                                "version = %02X,  "
 713                                "identification = %06X,  "
 714                                "machine = %04X\n",
 715                                n, cpuinfo->cpu_id.version,
 716                                cpuinfo->cpu_id.ident,
 717                                cpuinfo->cpu_id.machine);
 718         }
 719         preempt_enable();
 720         return 0;
 721 }
 722
 723 static void *c_start(struct seq_file *m, loff_t *pos)
 724 {
 725         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 726 }
 727 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 728 {
 729         ++*pos;
 730         return c_start(m, pos);
 731 }
 732 static void c_stop(struct seq_file *m, void *v)
 733 {
 734 }
 735 struct seq_operations cpuinfo_op = {
 736         .start  = c_start,
 737         .next   = c_next,
 738         .stop   = c_stop,
 739         .show   = show_cpuinfo,
 740 };
 741