SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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  * Machine setup..
  55  */
  56 unsigned int console_mode = 0;
  57 unsigned int console_devno = -1;
  58 unsigned int console_irq = -1;
  59 unsigned long memory_size = 0;
  60 unsigned long machine_flags = 0;
  61 struct {
  62         unsigned long addr, size, type;
  63 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  64 #define CHUNK_READ_WRITE 0
  65 #define CHUNK_READ_ONLY 1
  66 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  67 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  68 static unsigned long __initdata memory_end;
  69
  70 /*
  71  * This is set up by the setup-routine at boot-time
  72  * for S390 need to find out, what we have to setup
  73  * using address 0x10400 ...
  74  */
  75
  76 #include <asm/setup.h>
  77
  78 static struct resource code_resource = {
  79         .name  = "Kernel code",
  80         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  81 };
  82
  83 static struct resource data_resource = {
  84         .name = "Kernel data",
  85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  86 };
  87
  88 /*
  89  * cpu_init() initializes state that is per-CPU.
  90  */
  91 void __devinit cpu_init (void)
  92 {
  93         int addr = hard_smp_processor_id();
  94
  95         /*
  96          * Store processor id in lowcore (used e.g. in timer_interrupt)
  97          */
  98         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
  99         S390_lowcore.cpu_data.cpu_addr = addr;
 100
 101         /*
 102          * Force FPU initialization:
 103          */
 104         clear_thread_flag(TIF_USEDFPU);
 105         clear_used_math();
 106
 107         atomic_inc(&init_mm.mm_count);
 108         current->active_mm = &init_mm;
 109         if (current->mm)
 110                 BUG();
 111         enter_lazy_tlb(&init_mm, current);
 112 }
 113
 114 /*
 115  * VM halt and poweroff setup routines
 116  */
 117 char vmhalt_cmd[128] = "";
 118 char vmpoff_cmd[128] = "";
 119 char vmpanic_cmd[128] = "";
 120
 121 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 122 {
 123         int sx, dx;
 124
 125         dx = 0;
 126         for (sx = 0; src[sx] != 0; sx++) {
 127                 if (src[sx] == '"') continue;
 128                 dst[dx++] = src[sx];
 129                 if (dx >= n) break;
 130         }
 131 }
 132
 133 static int __init vmhalt_setup(char *str)
 134 {
 135         strncpy_skip_quote(vmhalt_cmd, str, 127);
 136         vmhalt_cmd[127] = 0;
 137         return 1;
 138 }
 139
 140 __setup("vmhalt=", vmhalt_setup);
 141
 142 static int __init vmpoff_setup(char *str)
 143 {
 144         strncpy_skip_quote(vmpoff_cmd, str, 127);
 145         vmpoff_cmd[127] = 0;
 146         return 1;
 147 }
 148
 149 __setup("vmpoff=", vmpoff_setup);
 150
 151 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 152                           void *data)
 153 {
 154         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 155                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 156
 157         return NOTIFY_OK;
 158 }
 159
 160 #define PANIC_PRI_VMPANIC       0
 161
 162 static struct notifier_block vmpanic_nb = {
 163         .notifier_call = vmpanic_notify,
 164         .priority = PANIC_PRI_VMPANIC
 165 };
 166
 167 static int __init vmpanic_setup(char *str)
 168 {
 169         static int register_done __initdata = 0;
 170
 171         strncpy_skip_quote(vmpanic_cmd, str, 127);
 172         vmpanic_cmd[127] = 0;
 173         if (!register_done) {
 174                 register_done = 1;
 175                 atomic_notifier_chain_register(&panic_notifier_list,
 176                                                &vmpanic_nb);
 177         }
 178         return 1;
 179 }
 180
 181 __setup("vmpanic=", vmpanic_setup);
 182
 183 /*
 184  * condev= and conmode= setup parameter.
 185  */
 186
 187 static int __init condev_setup(char *str)
 188 {
 189         int vdev;
 190
 191         vdev = simple_strtoul(str, &str, 0);
 192         if (vdev >= 0 && vdev < 65536) {
 193                 console_devno = vdev;
 194                 console_irq = -1;
 195         }
 196         return 1;
 197 }
 198
 199 __setup("condev=", condev_setup);
 200
 201 static int __init conmode_setup(char *str)
 202 {
 203 #if defined(CONFIG_SCLP_CONSOLE)
 204         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 205                 SET_CONSOLE_SCLP;
 206 #endif
 207 #if defined(CONFIG_TN3215_CONSOLE)
 208         if (strncmp(str, "3215", 5) == 0)
 209                 SET_CONSOLE_3215;
 210 #endif
 211 #if defined(CONFIG_TN3270_CONSOLE)
 212         if (strncmp(str, "3270", 5) == 0)
 213                 SET_CONSOLE_3270;
 214 #endif
 215         return 1;
 216 }
 217
 218 __setup("conmode=", conmode_setup);
 219
 220 static void __init conmode_default(void)
 221 {
 222         char query_buffer[1024];
 223         char *ptr;
 224
 225         if (MACHINE_IS_VM) {
 226                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 227                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 228                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 229                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 230                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 231                 ptr = strstr(query_buffer, "CONMODE");
 232                 /*
 233                  * Set the conmode to 3215 so that the device recognition
 234                  * will set the cu_type of the console to 3215. If the
 235                  * conmode is 3270 and we don't set it back then both
 236                  * 3215 and the 3270 driver will try to access the console
 237                  * device (3215 as console and 3270 as normal tty).
 238                  */
 239                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 240                 if (ptr == NULL) {
 241 #if defined(CONFIG_SCLP_CONSOLE)
 242                         SET_CONSOLE_SCLP;
 243 #endif
 244                         return;
 245                 }
 246                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 247 #if defined(CONFIG_TN3270_CONSOLE)
 248                         SET_CONSOLE_3270;
 249 #elif defined(CONFIG_TN3215_CONSOLE)
 250                         SET_CONSOLE_3215;
 251 #elif defined(CONFIG_SCLP_CONSOLE)
 252                         SET_CONSOLE_SCLP;
 253 #endif
 254                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 255 #if defined(CONFIG_TN3215_CONSOLE)
 256                         SET_CONSOLE_3215;
 257 #elif defined(CONFIG_TN3270_CONSOLE)
 258                         SET_CONSOLE_3270;
 259 #elif defined(CONFIG_SCLP_CONSOLE)
 260                         SET_CONSOLE_SCLP;
 261 #endif
 262                 }
 263         } else if (MACHINE_IS_P390) {
 264 #if defined(CONFIG_TN3215_CONSOLE)
 265                 SET_CONSOLE_3215;
 266 #elif defined(CONFIG_TN3270_CONSOLE)
 267                 SET_CONSOLE_3270;
 268 #endif
 269         } else {
 270 #if defined(CONFIG_SCLP_CONSOLE)
 271                 SET_CONSOLE_SCLP;
 272 #endif
 273         }
 274 }
 275
 276 #ifdef CONFIG_SMP
 277 extern void machine_restart_smp(char *);
 278 extern void machine_halt_smp(void);
 279 extern void machine_power_off_smp(void);
 280
 281 void (*_machine_restart)(char *command) = machine_restart_smp;
 282 void (*_machine_halt)(void) = machine_halt_smp;
 283 void (*_machine_power_off)(void) = machine_power_off_smp;
 284 #else
 285 /*
 286  * Reboot, halt and power_off routines for non SMP.
 287  */
 288 static void do_machine_restart_nonsmp(char * __unused)
 289 {
 290         do_reipl();
 291 }
 292
 293 static void do_machine_halt_nonsmp(void)
 294 {
 295         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 296                 cpcmd(vmhalt_cmd, NULL, 0, NULL);
 297         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 298 }
 299
 300 static void do_machine_power_off_nonsmp(void)
 301 {
 302         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 303                 cpcmd(vmpoff_cmd, NULL, 0, NULL);
 304         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 305 }
 306
 307 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 308 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 309 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 310 #endif
 311
 312  /*
 313  * Reboot, halt and power_off stubs. They just call _machine_restart,
 314  * _machine_halt or _machine_power_off.
 315  */
 316
 317 void machine_restart(char *command)
 318 {
 319         if (!in_interrupt() || oops_in_progress)
 320                 /*
 321                  * Only unblank the console if we are called in enabled
 322                  * context or a bust_spinlocks cleared the way for us.
 323                  */
 324                 console_unblank();
 325         _machine_restart(command);
 326 }
 327
 328 void machine_halt(void)
 329 {
 330         if (!in_interrupt() || oops_in_progress)
 331                 /*
 332                  * Only unblank the console if we are called in enabled
 333                  * context or a bust_spinlocks cleared the way for us.
 334                  */
 335                 console_unblank();
 336         _machine_halt();
 337 }
 338
 339 void machine_power_off(void)
 340 {
 341         if (!in_interrupt() || oops_in_progress)
 342                 /*
 343                  * Only unblank the console if we are called in enabled
 344                  * context or a bust_spinlocks cleared the way for us.
 345                  */
 346                 console_unblank();
 347         _machine_power_off();
 348 }
 349
 350 /*
 351  * Dummy power off function.
 352  */
 353 void (*pm_power_off)(void) = machine_power_off;
 354
 355 static void __init
 356 add_memory_hole(unsigned long start, unsigned long end)
 357 {
 358         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 359
 360         if (end <= dma_pfn)
 361                 zholes_size[ZONE_DMA] += end - start + 1;
 362         else if (start > dma_pfn)
 363                 zholes_size[ZONE_NORMAL] += end - start + 1;
 364         else {
 365                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 366                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 367         }
 368 }
 369
 370 static int __init early_parse_mem(char *p)
 371 {
 372         memory_end = memparse(p, &p);
 373         return 0;
 374 }
 375 early_param("mem", early_parse_mem);
 376
 377 /*
 378  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 379  */
 380 static int __init early_parse_ipldelay(char *p)
 381 {
 382         unsigned long delay = 0;
 383
 384         delay = simple_strtoul(p, &p, 0);
 385
 386         switch (*p) {
 387         case 's':
 388         case 'S':
 389                 delay *= 1000000;
 390                 break;
 391         case 'm':
 392         case 'M':
 393                 delay *= 60 * 1000000;
 394         }
 395
 396         /* now wait for the requested amount of time */
 397         udelay(delay);
 398
 399         return 0;
 400 }
 401 early_param("ipldelay", early_parse_ipldelay);
 402
 403 static void __init
 404 setup_lowcore(void)
 405 {
 406         struct _lowcore *lc;
 407         int lc_pages;
 408
 409         /*
 410          * Setup lowcore for boot cpu
 411          */
 412         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 413         lc = (struct _lowcore *)
 414                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 415         memset(lc, 0, lc_pages * PAGE_SIZE);
 416         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 417         lc->restart_psw.addr =
 418                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 419         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 420         lc->external_new_psw.addr =
 421                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 422         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 423         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 424         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 425         lc->program_new_psw.addr =
 426                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 427         lc->mcck_new_psw.mask =
 428                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 429         lc->mcck_new_psw.addr =
 430                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 431         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 432         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 433         lc->ipl_device = S390_lowcore.ipl_device;
 434         lc->jiffy_timer = -1LL;
 435         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 436         lc->async_stack = (unsigned long)
 437                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 438         lc->panic_stack = (unsigned long)
 439                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 440         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 441         lc->thread_info = (unsigned long) &init_thread_union;
 442 #ifndef CONFIG_64BIT
 443         if (MACHINE_HAS_IEEE) {
 444                 lc->extended_save_area_addr = (__u32)
 445                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 446                 /* enable extended save area */
 447                 ctl_set_bit(14, 29);
 448         }
 449 #endif
 450         set_prefix((u32)(unsigned long) lc);
 451 }
 452
 453 static void __init
 454 setup_resources(void)
 455 {
 456         struct resource *res;
 457         int i;
 458
 459         code_resource.start = (unsigned long) &_text;
 460         code_resource.end = (unsigned long) &_etext - 1;
 461         data_resource.start = (unsigned long) &_etext;
 462         data_resource.end = (unsigned long) &_edata - 1;
 463
 464         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 465                 res = alloc_bootmem_low(sizeof(struct resource));
 466                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 467                 switch (memory_chunk[i].type) {
 468                 case CHUNK_READ_WRITE:
 469                         res->name = "System RAM";
 470                         break;
 471                 case CHUNK_READ_ONLY:
 472                         res->name = "System ROM";
 473                         res->flags |= IORESOURCE_READONLY;
 474                         break;
 475                 default:
 476                         res->name = "reserved";
 477                 }
 478                 res->start = memory_chunk[i].addr;
 479                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 480                 request_resource(&iomem_resource, res);
 481                 request_resource(res, &code_resource);
 482                 request_resource(res, &data_resource);
 483         }
 484 }
 485
 486 static void __init
 487 setup_memory(void)
 488 {
 489         unsigned long bootmap_size;
 490         unsigned long start_pfn, end_pfn, init_pfn;
 491         unsigned long last_rw_end;
 492         int i;
 493
 494         /*
 495          * partially used pages are not usable - thus
 496          * we are rounding upwards:
 497          */
 498         start_pfn = PFN_UP(__pa(&_end));
 499         end_pfn = max_pfn = PFN_DOWN(memory_end);
 500
 501         /* Initialize storage key for kernel pages */
 502         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 503                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 504
 505 #ifdef CONFIG_BLK_DEV_INITRD
 506         /*
 507          * Move the initrd in case the bitmap of the bootmem allocater
 508          * would overwrite it.
 509          */
 510
 511         if (INITRD_START && INITRD_SIZE) {
 512                 unsigned long bmap_size;
 513                 unsigned long start;
 514
 515                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 516                 bmap_size = PFN_PHYS(bmap_size);
 517
 518                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 519                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 520
 521                         if (start + INITRD_SIZE > memory_end) {
 522                                 printk("initrd extends beyond end of memory "
 523                                        "(0x%08lx > 0x%08lx)\n"
 524                                        "disabling initrd\n",
 525                                        start + INITRD_SIZE, memory_end);
 526                                 INITRD_START = INITRD_SIZE = 0;
 527                         } else {
 528                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 529                                        "size: %ld)\n",
 530                                        INITRD_START, start, INITRD_SIZE);
 531                                 memmove((void *) start, (void *) INITRD_START,
 532                                         INITRD_SIZE);
 533                                 INITRD_START = start;
 534                         }
 535                 }
 536         }
 537 #endif
 538
 539         /*
 540          * Initialize the boot-time allocator (with low memory only):
 541          */
 542         bootmap_size = init_bootmem(start_pfn, end_pfn);
 543
 544         /*
 545          * Register RAM areas with the bootmem allocator.
 546          */
 547         last_rw_end = start_pfn;
 548
 549         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 550                 unsigned long start_chunk, end_chunk;
 551
 552                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 553                         continue;
 554                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 555                 start_chunk >>= PAGE_SHIFT;
 556                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 557                 end_chunk >>= PAGE_SHIFT;
 558                 if (start_chunk < start_pfn)
 559                         start_chunk = start_pfn;
 560                 if (end_chunk > end_pfn)
 561                         end_chunk = end_pfn;
 562                 if (start_chunk < end_chunk) {
 563                         /* Initialize storage key for RAM pages */
 564                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 565                              init_pfn++)
 566                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 567                                                      PAGE_DEFAULT_KEY);
 568                         free_bootmem(start_chunk << PAGE_SHIFT,
 569                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 570                         if (last_rw_end < start_chunk)
 571                                 add_memory_hole(last_rw_end, start_chunk - 1);
 572                         last_rw_end = end_chunk;
 573                 }
 574         }
 575
 576         psw_set_key(PAGE_DEFAULT_KEY);
 577
 578         if (last_rw_end < end_pfn - 1)
 579                 add_memory_hole(last_rw_end, end_pfn - 1);
 580
 581         /*
 582          * Reserve the bootmem bitmap itself as well. We do this in two
 583          * steps (first step was init_bootmem()) because this catches
 584          * the (very unlikely) case of us accidentally initializing the
 585          * bootmem allocator with an invalid RAM area.
 586          */
 587         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 588
 589 #ifdef CONFIG_BLK_DEV_INITRD
 590         if (INITRD_START && INITRD_SIZE) {
 591                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 592                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 593                         initrd_start = INITRD_START;
 594                         initrd_end = initrd_start + INITRD_SIZE;
 595                 } else {
 596                         printk("initrd extends beyond end of memory "
 597                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 598                                initrd_start + INITRD_SIZE, memory_end);
 599                         initrd_start = initrd_end = 0;
 600                 }
 601         }
 602 #endif
 603 }
 604
 605 /*
 606  * Setup function called from init/main.c just after the banner
 607  * was printed.
 608  */
 609
 610 void __init
 611 setup_arch(char **cmdline_p)
 612 {
 613         /*
 614          * print what head.S has found out about the machine
 615          */
 616 #ifndef CONFIG_64BIT
 617         printk((MACHINE_IS_VM) ?
 618                "We are running under VM (31 bit mode)\n" :
 619                "We are running native (31 bit mode)\n");
 620         printk((MACHINE_HAS_IEEE) ?
 621                "This machine has an IEEE fpu\n" :
 622                "This machine has no IEEE fpu\n");
 623 #else /* CONFIG_64BIT */
 624         printk((MACHINE_IS_VM) ?
 625                "We are running under VM (64 bit mode)\n" :
 626                "We are running native (64 bit mode)\n");
 627 #endif /* CONFIG_64BIT */
 628
 629         /* Save unparsed command line copy for /proc/cmdline */
 630         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 631
 632         *cmdline_p = COMMAND_LINE;
 633         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 634
 635         ROOT_DEV = Root_RAM0;
 636
 637         init_mm.start_code = PAGE_OFFSET;
 638         init_mm.end_code = (unsigned long) &_etext;
 639         init_mm.end_data = (unsigned long) &_edata;
 640         init_mm.brk = (unsigned long) &_end;
 641
 642         memory_end = memory_size;
 643
 644         parse_early_param();
 645
 646 #ifndef CONFIG_64BIT
 647         memory_end &= ~0x400000UL;
 648
 649         /*
 650          * We need some free virtual space to be able to do vmalloc.
 651          * On a machine with 2GB memory we make sure that we have at
 652          * least 128 MB free space for vmalloc.
 653          */
 654         if (memory_end > 1920*1024*1024)
 655                 memory_end = 1920*1024*1024;
 656 #else /* CONFIG_64BIT */
 657         memory_end &= ~0x200000UL;
 658 #endif /* CONFIG_64BIT */
 659
 660         setup_memory();
 661         setup_resources();
 662         setup_lowcore();
 663
 664         cpu_init();
 665         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 666         smp_setup_cpu_possible_map();
 667
 668         /*
 669          * Create kernel page tables and switch to virtual addressing.
 670          */
 671         paging_init();
 672
 673         /* Setup default console */
 674         conmode_default();
 675 }
 676
 677 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 678 {
 679    printk("cpu %d "
 680 #ifdef CONFIG_SMP
 681            "phys_idx=%d "
 682 #endif
 683            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 684            cpuinfo->cpu_nr,
 685 #ifdef CONFIG_SMP
 686            cpuinfo->cpu_addr,
 687 #endif
 688            cpuinfo->cpu_id.version,
 689            cpuinfo->cpu_id.ident,
 690            cpuinfo->cpu_id.machine,
 691            cpuinfo->cpu_id.unused);
 692 }
 693
 694 /*
 695  * show_cpuinfo - Get information on one CPU for use by procfs.
 696  */
 697
 698 static int show_cpuinfo(struct seq_file *m, void *v)
 699 {
 700         struct cpuinfo_S390 *cpuinfo;
 701         unsigned long n = (unsigned long) v - 1;
 702
 703         preempt_disable();
 704         if (!n) {
 705                 seq_printf(m, "vendor_id       : IBM/S390\n"
 706                                "# processors    : %i\n"
 707                                "bogomips per cpu: %lu.%02lu\n",
 708                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 709                                (loops_per_jiffy/(5000/HZ))%100);
 710         }
 711         if (cpu_online(n)) {
 712 #ifdef CONFIG_SMP
 713                 if (smp_processor_id() == n)
 714                         cpuinfo = &S390_lowcore.cpu_data;
 715                 else
 716                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 717 #else
 718                 cpuinfo = &S390_lowcore.cpu_data;
 719 #endif
 720                 seq_printf(m, "processor %li: "
 721                                "version = %02X,  "
 722                                "identification = %06X,  "
 723                                "machine = %04X\n",
 724                                n, cpuinfo->cpu_id.version,
 725                                cpuinfo->cpu_id.ident,
 726                                cpuinfo->cpu_id.machine);
 727         }
 728         preempt_enable();
 729         return 0;
 730 }
 731
 732 static void *c_start(struct seq_file *m, loff_t *pos)
 733 {
 734         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 735 }
 736 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 737 {
 738         ++*pos;
 739         return c_start(m, pos);
 740 }
 741 static void c_stop(struct seq_file *m, void *v)
 742 {
 743 }
 744 struct seq_operations cpuinfo_op = {
 745         .start  = c_start,
 746         .next   = c_next,
 747         .stop   = c_stop,
 748         .show   = show_cpuinfo,
 749 };
 750