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 memory_chunk[MEMORY_CHUNKS];
  68 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  69 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  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 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 extern void machine_restart_smp(char *);
 280 extern void machine_halt_smp(void);
 281 extern void machine_power_off_smp(void);
 282
 283 void (*_machine_restart)(char *command) = machine_restart_smp;
 284 void (*_machine_halt)(void) = machine_halt_smp;
 285 void (*_machine_power_off)(void) = machine_power_off_smp;
 286 #else
 287 /*
 288  * Reboot, halt and power_off routines for non SMP.
 289  */
 290 static void do_machine_restart_nonsmp(char * __unused)
 291 {
 292         do_reipl();
 293 }
 294
 295 static void do_machine_halt_nonsmp(void)
 296 {
 297         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 298                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 299         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 300 }
 301
 302 static void do_machine_power_off_nonsmp(void)
 303 {
 304         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 305                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 306         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 307 }
 308
 309 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 310 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 311 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 312 #endif
 313
 314  /*
 315  * Reboot, halt and power_off stubs. They just call _machine_restart,
 316  * _machine_halt or _machine_power_off.
 317  */
 318
 319 void machine_restart(char *command)
 320 {
 321         if (!in_interrupt() || oops_in_progress)
 322                 /*
 323                  * Only unblank the console if we are called in enabled
 324                  * context or a bust_spinlocks cleared the way for us.
 325                  */
 326                 console_unblank();
 327         _machine_restart(command);
 328 }
 329
 330 void machine_halt(void)
 331 {
 332         if (!in_interrupt() || oops_in_progress)
 333                 /*
 334                  * Only unblank the console if we are called in enabled
 335                  * context or a bust_spinlocks cleared the way for us.
 336                  */
 337                 console_unblank();
 338         _machine_halt();
 339 }
 340
 341 void machine_power_off(void)
 342 {
 343         if (!in_interrupt() || oops_in_progress)
 344                 /*
 345                  * Only unblank the console if we are called in enabled
 346                  * context or a bust_spinlocks cleared the way for us.
 347                  */
 348                 console_unblank();
 349         _machine_power_off();
 350 }
 351
 352 /*
 353  * Dummy power off function.
 354  */
 355 void (*pm_power_off)(void) = machine_power_off;
 356
 357 static void __init
 358 add_memory_hole(unsigned long start, unsigned long end)
 359 {
 360         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 361
 362         if (end <= dma_pfn)
 363                 zholes_size[ZONE_DMA] += end - start + 1;
 364         else if (start > dma_pfn)
 365                 zholes_size[ZONE_NORMAL] += end - start + 1;
 366         else {
 367                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 368                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 369         }
 370 }
 371
 372 static int __init early_parse_mem(char *p)
 373 {
 374         memory_end = memparse(p, &p);
 375         return 0;
 376 }
 377 early_param("mem", early_parse_mem);
 378
 379 /*
 380  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 381  */
 382 static int __init early_parse_ipldelay(char *p)
 383 {
 384         unsigned long delay = 0;
 385
 386         delay = simple_strtoul(p, &p, 0);
 387
 388         switch (*p) {
 389         case 's':
 390         case 'S':
 391                 delay *= 1000000;
 392                 break;
 393         case 'm':
 394         case 'M':
 395                 delay *= 60 * 1000000;
 396         }
 397
 398         /* now wait for the requested amount of time */
 399         udelay(delay);
 400
 401         return 0;
 402 }
 403 early_param("ipldelay", early_parse_ipldelay);
 404
 405 static void __init
 406 setup_lowcore(void)
 407 {
 408         struct _lowcore *lc;
 409         int lc_pages;
 410
 411         /*
 412          * Setup lowcore for boot cpu
 413          */
 414         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 415         lc = (struct _lowcore *)
 416                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 417         memset(lc, 0, lc_pages * PAGE_SIZE);
 418         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 419         lc->restart_psw.addr =
 420                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 421         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 422         lc->external_new_psw.addr =
 423                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 424         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 425         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 426         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 427         lc->program_new_psw.addr =
 428                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 429         lc->mcck_new_psw.mask =
 430                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 431         lc->mcck_new_psw.addr =
 432                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 433         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 434         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 435         lc->ipl_device = S390_lowcore.ipl_device;
 436         lc->jiffy_timer = -1LL;
 437         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 438         lc->async_stack = (unsigned long)
 439                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 440         lc->panic_stack = (unsigned long)
 441                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 442         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 443         lc->thread_info = (unsigned long) &init_thread_union;
 444 #ifndef CONFIG_64BIT
 445         if (MACHINE_HAS_IEEE) {
 446                 lc->extended_save_area_addr = (__u32)
 447                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 448                 /* enable extended save area */
 449                 __ctl_set_bit(14, 29);
 450         }
 451 #endif
 452         set_prefix((u32)(unsigned long) lc);
 453 }
 454
 455 static void __init
 456 setup_resources(void)
 457 {
 458         struct resource *res;
 459         int i;
 460
 461         code_resource.start = (unsigned long) &_text;
 462         code_resource.end = (unsigned long) &_etext - 1;
 463         data_resource.start = (unsigned long) &_etext;
 464         data_resource.end = (unsigned long) &_edata - 1;
 465
 466         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 467                 res = alloc_bootmem_low(sizeof(struct resource));
 468                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 469                 switch (memory_chunk[i].type) {
 470                 case CHUNK_READ_WRITE:
 471                         res->name = "System RAM";
 472                         break;
 473                 case CHUNK_READ_ONLY:
 474                         res->name = "System ROM";
 475                         res->flags |= IORESOURCE_READONLY;
 476                         break;
 477                 default:
 478                         res->name = "reserved";
 479                 }
 480                 res->start = memory_chunk[i].addr;
 481                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 482                 request_resource(&iomem_resource, res);
 483                 request_resource(res, &code_resource);
 484                 request_resource(res, &data_resource);
 485         }
 486 }
 487
 488 static void __init setup_memory_end(void)
 489 {
 490         unsigned long real_size, memory_size;
 491         unsigned long max_mem, max_phys;
 492         int i;
 493
 494         memory_size = real_size = 0;
 495         max_phys = VMALLOC_END - VMALLOC_MIN_SIZE;
 496         memory_end &= PAGE_MASK;
 497
 498         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 499
 500         for (i = 0; i < MEMORY_CHUNKS; i++) {
 501                 struct mem_chunk *chunk = &memory_chunk[i];
 502
 503                 real_size = max(real_size, chunk->addr + chunk->size);
 504                 if (chunk->addr >= max_mem) {
 505                         memset(chunk, 0, sizeof(*chunk));
 506                         continue;
 507                 }
 508                 if (chunk->addr + chunk->size > max_mem)
 509                         chunk->size = max_mem - chunk->addr;
 510                 memory_size = max(memory_size, chunk->addr + chunk->size);
 511         }
 512         if (!memory_end)
 513                 memory_end = memory_size;
 514         if (real_size > memory_end)
 515                 printk("More memory detected than supported. Unused: %luk\n",
 516                        (real_size - memory_end) >> 10);
 517 }
 518
 519 static void __init
 520 setup_memory(void)
 521 {
 522         unsigned long bootmap_size;
 523         unsigned long start_pfn, end_pfn, init_pfn;
 524         unsigned long last_rw_end;
 525         int i;
 526
 527         /*
 528          * partially used pages are not usable - thus
 529          * we are rounding upwards:
 530          */
 531         start_pfn = PFN_UP(__pa(&_end));
 532         end_pfn = max_pfn = PFN_DOWN(memory_end);
 533
 534         /* Initialize storage key for kernel pages */
 535         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 536                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 537
 538 #ifdef CONFIG_BLK_DEV_INITRD
 539         /*
 540          * Move the initrd in case the bitmap of the bootmem allocater
 541          * would overwrite it.
 542          */
 543
 544         if (INITRD_START && INITRD_SIZE) {
 545                 unsigned long bmap_size;
 546                 unsigned long start;
 547
 548                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 549                 bmap_size = PFN_PHYS(bmap_size);
 550
 551                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 552                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 553
 554                         if (start + INITRD_SIZE > memory_end) {
 555                                 printk("initrd extends beyond end of memory "
 556                                        "(0x%08lx > 0x%08lx)\n"
 557                                        "disabling initrd\n",
 558                                        start + INITRD_SIZE, memory_end);
 559                                 INITRD_START = INITRD_SIZE = 0;
 560                         } else {
 561                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 562                                        "size: %ld)\n",
 563                                        INITRD_START, start, INITRD_SIZE);
 564                                 memmove((void *) start, (void *) INITRD_START,
 565                                         INITRD_SIZE);
 566                                 INITRD_START = start;
 567                         }
 568                 }
 569         }
 570 #endif
 571
 572         /*
 573          * Initialize the boot-time allocator
 574          */
 575         bootmap_size = init_bootmem(start_pfn, end_pfn);
 576
 577         /*
 578          * Register RAM areas with the bootmem allocator.
 579          */
 580         last_rw_end = start_pfn;
 581
 582         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 583                 unsigned long start_chunk, end_chunk;
 584
 585                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 586                         continue;
 587                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 588                 start_chunk >>= PAGE_SHIFT;
 589                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 590                 end_chunk >>= PAGE_SHIFT;
 591                 if (start_chunk < start_pfn)
 592                         start_chunk = start_pfn;
 593                 if (end_chunk > end_pfn)
 594                         end_chunk = end_pfn;
 595                 if (start_chunk < end_chunk) {
 596                         /* Initialize storage key for RAM pages */
 597                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 598                              init_pfn++)
 599                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 600                                                      PAGE_DEFAULT_KEY);
 601                         free_bootmem(start_chunk << PAGE_SHIFT,
 602                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 603                         if (last_rw_end < start_chunk)
 604                                 add_memory_hole(last_rw_end, start_chunk - 1);
 605                         last_rw_end = end_chunk;
 606                 }
 607         }
 608
 609         psw_set_key(PAGE_DEFAULT_KEY);
 610
 611         if (last_rw_end < end_pfn - 1)
 612                 add_memory_hole(last_rw_end, end_pfn - 1);
 613
 614         /*
 615          * Reserve the bootmem bitmap itself as well. We do this in two
 616          * steps (first step was init_bootmem()) because this catches
 617          * the (very unlikely) case of us accidentally initializing the
 618          * bootmem allocator with an invalid RAM area.
 619          */
 620         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 621
 622 #ifdef CONFIG_BLK_DEV_INITRD
 623         if (INITRD_START && INITRD_SIZE) {
 624                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 625                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 626                         initrd_start = INITRD_START;
 627                         initrd_end = initrd_start + INITRD_SIZE;
 628                 } else {
 629                         printk("initrd extends beyond end of memory "
 630                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 631                                initrd_start + INITRD_SIZE, memory_end);
 632                         initrd_start = initrd_end = 0;
 633                 }
 634         }
 635 #endif
 636 }
 637
 638 /*
 639  * Setup function called from init/main.c just after the banner
 640  * was printed.
 641  */
 642
 643 void __init
 644 setup_arch(char **cmdline_p)
 645 {
 646         /*
 647          * print what head.S has found out about the machine
 648          */
 649 #ifndef CONFIG_64BIT
 650         printk((MACHINE_IS_VM) ?
 651                "We are running under VM (31 bit mode)\n" :
 652                "We are running native (31 bit mode)\n");
 653         printk((MACHINE_HAS_IEEE) ?
 654                "This machine has an IEEE fpu\n" :
 655                "This machine has no IEEE fpu\n");
 656 #else /* CONFIG_64BIT */
 657         printk((MACHINE_IS_VM) ?
 658                "We are running under VM (64 bit mode)\n" :
 659                "We are running native (64 bit mode)\n");
 660 #endif /* CONFIG_64BIT */
 661
 662         /* Save unparsed command line copy for /proc/cmdline */
 663         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 664
 665         *cmdline_p = COMMAND_LINE;
 666         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 667
 668         ROOT_DEV = Root_RAM0;
 669
 670         init_mm.start_code = PAGE_OFFSET;
 671         init_mm.end_code = (unsigned long) &_etext;
 672         init_mm.end_data = (unsigned long) &_edata;
 673         init_mm.brk = (unsigned long) &_end;
 674
 675         if (MACHINE_HAS_MVCOS)
 676                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 677         else
 678                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 679
 680         parse_early_param();
 681
 682         setup_memory_end();
 683         setup_memory();
 684         setup_resources();
 685         setup_lowcore();
 686
 687         cpu_init();
 688         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 689         smp_setup_cpu_possible_map();
 690
 691         /*
 692          * Create kernel page tables and switch to virtual addressing.
 693          */
 694         paging_init();
 695
 696         /* Setup default console */
 697         conmode_default();
 698 }
 699
 700 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 701 {
 702    printk("cpu %d "
 703 #ifdef CONFIG_SMP
 704            "phys_idx=%d "
 705 #endif
 706            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 707            cpuinfo->cpu_nr,
 708 #ifdef CONFIG_SMP
 709            cpuinfo->cpu_addr,
 710 #endif
 711            cpuinfo->cpu_id.version,
 712            cpuinfo->cpu_id.ident,
 713            cpuinfo->cpu_id.machine,
 714            cpuinfo->cpu_id.unused);
 715 }
 716
 717 /*
 718  * show_cpuinfo - Get information on one CPU for use by procfs.
 719  */
 720
 721 static int show_cpuinfo(struct seq_file *m, void *v)
 722 {
 723         struct cpuinfo_S390 *cpuinfo;
 724         unsigned long n = (unsigned long) v - 1;
 725
 726         preempt_disable();
 727         if (!n) {
 728                 seq_printf(m, "vendor_id       : IBM/S390\n"
 729                                "# processors    : %i\n"
 730                                "bogomips per cpu: %lu.%02lu\n",
 731                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 732                                (loops_per_jiffy/(5000/HZ))%100);
 733         }
 734         if (cpu_online(n)) {
 735 #ifdef CONFIG_SMP
 736                 if (smp_processor_id() == n)
 737                         cpuinfo = &S390_lowcore.cpu_data;
 738                 else
 739                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 740 #else
 741                 cpuinfo = &S390_lowcore.cpu_data;
 742 #endif
 743                 seq_printf(m, "processor %li: "
 744                                "version = %02X,  "
 745                                "identification = %06X,  "
 746                                "machine = %04X\n",
 747                                n, cpuinfo->cpu_id.version,
 748                                cpuinfo->cpu_id.ident,
 749                                cpuinfo->cpu_id.machine);
 750         }
 751         preempt_enable();
 752         return 0;
 753 }
 754
 755 static void *c_start(struct seq_file *m, loff_t *pos)
 756 {
 757         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 758 }
 759 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 760 {
 761         ++*pos;
 762         return c_start(m, pos);
 763 }
 764 static void c_stop(struct seq_file *m, void *v)
 765 {
 766 }
 767 struct seq_operations cpuinfo_op = {
 768         .start  = c_start,
 769         .next   = c_next,
 770         .stop   = c_stop,
 771         .show   = show_cpuinfo,
 772 };
 773