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   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/root_dev.h>
  35 #include <linux/console.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/device.h>
  39 #include <linux/notifier.h>
  40 #include <linux/pfn.h>
  41
  42 #include <asm/uaccess.h>
  43 #include <asm/system.h>
  44 #include <asm/smp.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/cpcmd.h>
  47 #include <asm/lowcore.h>
  48 #include <asm/irq.h>
  49 #include <asm/page.h>
  50 #include <asm/ptrace.h>
  51 #include <asm/sections.h>
  52
  53 /*
  54  * User copy operations.
  55  */
  56 struct uaccess_ops uaccess;
  57 EXPORT_SYMBOL_GPL(uaccess);
  58
  59 /*
  60  * Machine setup..
  61  */
  62 unsigned int console_mode = 0;
  63 unsigned int console_devno = -1;
  64 unsigned int console_irq = -1;
  65 unsigned long memory_size = 0;
  66 unsigned long machine_flags = 0;
  67
  68 struct mem_chunk memory_chunk[MEMORY_CHUNKS];
  69 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  70 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  71 static unsigned long __initdata memory_end;
  72
  73 /*
  74  * This is set up by the setup-routine at boot-time
  75  * for S390 need to find out, what we have to setup
  76  * using address 0x10400 ...
  77  */
  78
  79 #include <asm/setup.h>
  80
  81 static struct resource code_resource = {
  82         .name  = "Kernel code",
  83         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  84 };
  85
  86 static struct resource data_resource = {
  87         .name = "Kernel data",
  88         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  89 };
  90
  91 /*
  92  * cpu_init() initializes state that is per-CPU.
  93  */
  94 void __devinit cpu_init (void)
  95 {
  96         int addr = hard_smp_processor_id();
  97
  98         /*
  99          * Store processor id in lowcore (used e.g. in timer_interrupt)
 100          */
 101         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 102         S390_lowcore.cpu_data.cpu_addr = addr;
 103
 104         /*
 105          * Force FPU initialization:
 106          */
 107         clear_thread_flag(TIF_USEDFPU);
 108         clear_used_math();
 109
 110         atomic_inc(&init_mm.mm_count);
 111         current->active_mm = &init_mm;
 112         if (current->mm)
 113                 BUG();
 114         enter_lazy_tlb(&init_mm, current);
 115 }
 116
 117 /*
 118  * VM halt and poweroff setup routines
 119  */
 120 char vmhalt_cmd[128] = "";
 121 char vmpoff_cmd[128] = "";
 122 char vmpanic_cmd[128] = "";
 123
 124 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 125 {
 126         int sx, dx;
 127
 128         dx = 0;
 129         for (sx = 0; src[sx] != 0; sx++) {
 130                 if (src[sx] == '"') continue;
 131                 dst[dx++] = src[sx];
 132                 if (dx >= n) break;
 133         }
 134 }
 135
 136 static int __init vmhalt_setup(char *str)
 137 {
 138         strncpy_skip_quote(vmhalt_cmd, str, 127);
 139         vmhalt_cmd[127] = 0;
 140         return 1;
 141 }
 142
 143 __setup("vmhalt=", vmhalt_setup);
 144
 145 static int __init vmpoff_setup(char *str)
 146 {
 147         strncpy_skip_quote(vmpoff_cmd, str, 127);
 148         vmpoff_cmd[127] = 0;
 149         return 1;
 150 }
 151
 152 __setup("vmpoff=", vmpoff_setup);
 153
 154 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 155                           void *data)
 156 {
 157         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 158                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 159
 160         return NOTIFY_OK;
 161 }
 162
 163 #define PANIC_PRI_VMPANIC       0
 164
 165 static struct notifier_block vmpanic_nb = {
 166         .notifier_call = vmpanic_notify,
 167         .priority = PANIC_PRI_VMPANIC
 168 };
 169
 170 static int __init vmpanic_setup(char *str)
 171 {
 172         static int register_done __initdata = 0;
 173
 174         strncpy_skip_quote(vmpanic_cmd, str, 127);
 175         vmpanic_cmd[127] = 0;
 176         if (!register_done) {
 177                 register_done = 1;
 178                 atomic_notifier_chain_register(&panic_notifier_list,
 179                                                &vmpanic_nb);
 180         }
 181         return 1;
 182 }
 183
 184 __setup("vmpanic=", vmpanic_setup);
 185
 186 /*
 187  * condev= and conmode= setup parameter.
 188  */
 189
 190 static int __init condev_setup(char *str)
 191 {
 192         int vdev;
 193
 194         vdev = simple_strtoul(str, &str, 0);
 195         if (vdev >= 0 && vdev < 65536) {
 196                 console_devno = vdev;
 197                 console_irq = -1;
 198         }
 199         return 1;
 200 }
 201
 202 __setup("condev=", condev_setup);
 203
 204 static int __init conmode_setup(char *str)
 205 {
 206 #if defined(CONFIG_SCLP_CONSOLE)
 207         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 208                 SET_CONSOLE_SCLP;
 209 #endif
 210 #if defined(CONFIG_TN3215_CONSOLE)
 211         if (strncmp(str, "3215", 5) == 0)
 212                 SET_CONSOLE_3215;
 213 #endif
 214 #if defined(CONFIG_TN3270_CONSOLE)
 215         if (strncmp(str, "3270", 5) == 0)
 216                 SET_CONSOLE_3270;
 217 #endif
 218         return 1;
 219 }
 220
 221 __setup("conmode=", conmode_setup);
 222
 223 static void __init conmode_default(void)
 224 {
 225         char query_buffer[1024];
 226         char *ptr;
 227
 228         if (MACHINE_IS_VM) {
 229                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 230                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 231                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 232                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 233                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 234                 ptr = strstr(query_buffer, "CONMODE");
 235                 /*
 236                  * Set the conmode to 3215 so that the device recognition
 237                  * will set the cu_type of the console to 3215. If the
 238                  * conmode is 3270 and we don't set it back then both
 239                  * 3215 and the 3270 driver will try to access the console
 240                  * device (3215 as console and 3270 as normal tty).
 241                  */
 242                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 243                 if (ptr == NULL) {
 244 #if defined(CONFIG_SCLP_CONSOLE)
 245                         SET_CONSOLE_SCLP;
 246 #endif
 247                         return;
 248                 }
 249                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 250 #if defined(CONFIG_TN3270_CONSOLE)
 251                         SET_CONSOLE_3270;
 252 #elif defined(CONFIG_TN3215_CONSOLE)
 253                         SET_CONSOLE_3215;
 254 #elif defined(CONFIG_SCLP_CONSOLE)
 255                         SET_CONSOLE_SCLP;
 256 #endif
 257                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 258 #if defined(CONFIG_TN3215_CONSOLE)
 259                         SET_CONSOLE_3215;
 260 #elif defined(CONFIG_TN3270_CONSOLE)
 261                         SET_CONSOLE_3270;
 262 #elif defined(CONFIG_SCLP_CONSOLE)
 263                         SET_CONSOLE_SCLP;
 264 #endif
 265                 }
 266         } else if (MACHINE_IS_P390) {
 267 #if defined(CONFIG_TN3215_CONSOLE)
 268                 SET_CONSOLE_3215;
 269 #elif defined(CONFIG_TN3270_CONSOLE)
 270                 SET_CONSOLE_3270;
 271 #endif
 272         } else {
 273 #if defined(CONFIG_SCLP_CONSOLE)
 274                 SET_CONSOLE_SCLP;
 275 #endif
 276         }
 277 }
 278
 279 #ifdef CONFIG_SMP
 280 extern void machine_restart_smp(char *);
 281 extern void machine_halt_smp(void);
 282 extern void machine_power_off_smp(void);
 283
 284 void (*_machine_restart)(char *command) = machine_restart_smp;
 285 void (*_machine_halt)(void) = machine_halt_smp;
 286 void (*_machine_power_off)(void) = machine_power_off_smp;
 287 #else
 288 /*
 289  * Reboot, halt and power_off routines for non SMP.
 290  */
 291 static void do_machine_restart_nonsmp(char * __unused)
 292 {
 293         do_reipl();
 294 }
 295
 296 static void do_machine_halt_nonsmp(void)
 297 {
 298         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 299                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 300         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 301 }
 302
 303 static void do_machine_power_off_nonsmp(void)
 304 {
 305         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 306                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 307         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 308 }
 309
 310 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 311 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 312 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 313 #endif
 314
 315  /*
 316  * Reboot, halt and power_off stubs. They just call _machine_restart,
 317  * _machine_halt or _machine_power_off.
 318  */
 319
 320 void machine_restart(char *command)
 321 {
 322         if (!in_interrupt() || oops_in_progress)
 323                 /*
 324                  * Only unblank the console if we are called in enabled
 325                  * context or a bust_spinlocks cleared the way for us.
 326                  */
 327                 console_unblank();
 328         _machine_restart(command);
 329 }
 330
 331 void machine_halt(void)
 332 {
 333         if (!in_interrupt() || oops_in_progress)
 334                 /*
 335                  * Only unblank the console if we are called in enabled
 336                  * context or a bust_spinlocks cleared the way for us.
 337                  */
 338                 console_unblank();
 339         _machine_halt();
 340 }
 341
 342 void machine_power_off(void)
 343 {
 344         if (!in_interrupt() || oops_in_progress)
 345                 /*
 346                  * Only unblank the console if we are called in enabled
 347                  * context or a bust_spinlocks cleared the way for us.
 348                  */
 349                 console_unblank();
 350         _machine_power_off();
 351 }
 352
 353 /*
 354  * Dummy power off function.
 355  */
 356 void (*pm_power_off)(void) = machine_power_off;
 357
 358 static void __init
 359 add_memory_hole(unsigned long start, unsigned long end)
 360 {
 361         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 362
 363         if (end <= dma_pfn)
 364                 zholes_size[ZONE_DMA] += end - start + 1;
 365         else if (start > dma_pfn)
 366                 zholes_size[ZONE_NORMAL] += end - start + 1;
 367         else {
 368                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 369                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 370         }
 371 }
 372
 373 static int __init early_parse_mem(char *p)
 374 {
 375         memory_end = memparse(p, &p);
 376         return 0;
 377 }
 378 early_param("mem", early_parse_mem);
 379
 380 /*
 381  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 382  */
 383 static int __init early_parse_ipldelay(char *p)
 384 {
 385         unsigned long delay = 0;
 386
 387         delay = simple_strtoul(p, &p, 0);
 388
 389         switch (*p) {
 390         case 's':
 391         case 'S':
 392                 delay *= 1000000;
 393                 break;
 394         case 'm':
 395         case 'M':
 396                 delay *= 60 * 1000000;
 397         }
 398
 399         /* now wait for the requested amount of time */
 400         udelay(delay);
 401
 402         return 0;
 403 }
 404 early_param("ipldelay", early_parse_ipldelay);
 405
 406 static void __init
 407 setup_lowcore(void)
 408 {
 409         struct _lowcore *lc;
 410         int lc_pages;
 411
 412         /*
 413          * Setup lowcore for boot cpu
 414          */
 415         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 416         lc = (struct _lowcore *)
 417                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 418         memset(lc, 0, lc_pages * PAGE_SIZE);
 419         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 420         lc->restart_psw.addr =
 421                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 422         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 423         lc->external_new_psw.addr =
 424                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 425         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 426         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 427         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 428         lc->program_new_psw.addr =
 429                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 430         lc->mcck_new_psw.mask =
 431                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 432         lc->mcck_new_psw.addr =
 433                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 434         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 435         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 436         lc->ipl_device = S390_lowcore.ipl_device;
 437         lc->jiffy_timer = -1LL;
 438         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 439         lc->async_stack = (unsigned long)
 440                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 441         lc->panic_stack = (unsigned long)
 442                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 443         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 444         lc->thread_info = (unsigned long) &init_thread_union;
 445 #ifndef CONFIG_64BIT
 446         if (MACHINE_HAS_IEEE) {
 447                 lc->extended_save_area_addr = (__u32)
 448                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 449                 /* enable extended save area */
 450                 __ctl_set_bit(14, 29);
 451         }
 452 #endif
 453         set_prefix((u32)(unsigned long) lc);
 454 }
 455
 456 static void __init
 457 setup_resources(void)
 458 {
 459         struct resource *res;
 460         int i;
 461
 462         code_resource.start = (unsigned long) &_text;
 463         code_resource.end = (unsigned long) &_etext - 1;
 464         data_resource.start = (unsigned long) &_etext;
 465         data_resource.end = (unsigned long) &_edata - 1;
 466
 467         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 468                 res = alloc_bootmem_low(sizeof(struct resource));
 469                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 470                 switch (memory_chunk[i].type) {
 471                 case CHUNK_READ_WRITE:
 472                         res->name = "System RAM";
 473                         break;
 474                 case CHUNK_READ_ONLY:
 475                         res->name = "System ROM";
 476                         res->flags |= IORESOURCE_READONLY;
 477                         break;
 478                 default:
 479                         res->name = "reserved";
 480                 }
 481                 res->start = memory_chunk[i].addr;
 482                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 483                 request_resource(&iomem_resource, res);
 484                 request_resource(res, &code_resource);
 485                 request_resource(res, &data_resource);
 486         }
 487 }
 488
 489 static void __init
 490 setup_memory(void)
 491 {
 492         unsigned long bootmap_size;
 493         unsigned long start_pfn, end_pfn, init_pfn;
 494         unsigned long last_rw_end;
 495         int i;
 496
 497         /*
 498          * partially used pages are not usable - thus
 499          * we are rounding upwards:
 500          */
 501         start_pfn = PFN_UP(__pa(&_end));
 502         end_pfn = max_pfn = PFN_DOWN(memory_end);
 503
 504         /* Initialize storage key for kernel pages */
 505         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 506                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 507
 508 #ifdef CONFIG_BLK_DEV_INITRD
 509         /*
 510          * Move the initrd in case the bitmap of the bootmem allocater
 511          * would overwrite it.
 512          */
 513
 514         if (INITRD_START && INITRD_SIZE) {
 515                 unsigned long bmap_size;
 516                 unsigned long start;
 517
 518                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 519                 bmap_size = PFN_PHYS(bmap_size);
 520
 521                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 522                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 523
 524                         if (start + INITRD_SIZE > memory_end) {
 525                                 printk("initrd extends beyond end of memory "
 526                                        "(0x%08lx > 0x%08lx)\n"
 527                                        "disabling initrd\n",
 528                                        start + INITRD_SIZE, memory_end);
 529                                 INITRD_START = INITRD_SIZE = 0;
 530                         } else {
 531                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 532                                        "size: %ld)\n",
 533                                        INITRD_START, start, INITRD_SIZE);
 534                                 memmove((void *) start, (void *) INITRD_START,
 535                                         INITRD_SIZE);
 536                                 INITRD_START = start;
 537                         }
 538                 }
 539         }
 540 #endif
 541
 542         /*
 543          * Initialize the boot-time allocator
 544          */
 545         bootmap_size = init_bootmem(start_pfn, end_pfn);
 546
 547         /*
 548          * Register RAM areas with the bootmem allocator.
 549          */
 550         last_rw_end = start_pfn;
 551
 552         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 553                 unsigned long start_chunk, end_chunk;
 554
 555                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 556                         continue;
 557                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 558                 start_chunk >>= PAGE_SHIFT;
 559                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 560                 end_chunk >>= PAGE_SHIFT;
 561                 if (start_chunk < start_pfn)
 562                         start_chunk = start_pfn;
 563                 if (end_chunk > end_pfn)
 564                         end_chunk = end_pfn;
 565                 if (start_chunk < end_chunk) {
 566                         /* Initialize storage key for RAM pages */
 567                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 568                              init_pfn++)
 569                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 570                                                      PAGE_DEFAULT_KEY);
 571                         free_bootmem(start_chunk << PAGE_SHIFT,
 572                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 573                         if (last_rw_end < start_chunk)
 574                                 add_memory_hole(last_rw_end, start_chunk - 1);
 575                         last_rw_end = end_chunk;
 576                 }
 577         }
 578
 579         psw_set_key(PAGE_DEFAULT_KEY);
 580
 581         if (last_rw_end < end_pfn - 1)
 582                 add_memory_hole(last_rw_end, end_pfn - 1);
 583
 584         /*
 585          * Reserve the bootmem bitmap itself as well. We do this in two
 586          * steps (first step was init_bootmem()) because this catches
 587          * the (very unlikely) case of us accidentally initializing the
 588          * bootmem allocator with an invalid RAM area.
 589          */
 590         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 591
 592 #ifdef CONFIG_BLK_DEV_INITRD
 593         if (INITRD_START && INITRD_SIZE) {
 594                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 595                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 596                         initrd_start = INITRD_START;
 597                         initrd_end = initrd_start + INITRD_SIZE;
 598                 } else {
 599                         printk("initrd extends beyond end of memory "
 600                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 601                                initrd_start + INITRD_SIZE, memory_end);
 602                         initrd_start = initrd_end = 0;
 603                 }
 604         }
 605 #endif
 606 }
 607
 608 /*
 609  * Setup function called from init/main.c just after the banner
 610  * was printed.
 611  */
 612
 613 void __init
 614 setup_arch(char **cmdline_p)
 615 {
 616         /*
 617          * print what head.S has found out about the machine
 618          */
 619 #ifndef CONFIG_64BIT
 620         printk((MACHINE_IS_VM) ?
 621                "We are running under VM (31 bit mode)\n" :
 622                "We are running native (31 bit mode)\n");
 623         printk((MACHINE_HAS_IEEE) ?
 624                "This machine has an IEEE fpu\n" :
 625                "This machine has no IEEE fpu\n");
 626 #else /* CONFIG_64BIT */
 627         printk((MACHINE_IS_VM) ?
 628                "We are running under VM (64 bit mode)\n" :
 629                "We are running native (64 bit mode)\n");
 630 #endif /* CONFIG_64BIT */
 631
 632         /* Save unparsed command line copy for /proc/cmdline */
 633         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 634
 635         *cmdline_p = COMMAND_LINE;
 636         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 637
 638         ROOT_DEV = Root_RAM0;
 639
 640         init_mm.start_code = PAGE_OFFSET;
 641         init_mm.end_code = (unsigned long) &_etext;
 642         init_mm.end_data = (unsigned long) &_edata;
 643         init_mm.brk = (unsigned long) &_end;
 644
 645         memory_end = memory_size;
 646
 647         if (MACHINE_HAS_MVCOS)
 648                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 649         else
 650                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 651
 652         parse_early_param();
 653
 654 #ifndef CONFIG_64BIT
 655         memory_end &= ~0x400000UL;
 656
 657         /*
 658          * We need some free virtual space to be able to do vmalloc.
 659          * On a machine with 2GB memory we make sure that we have at
 660          * least 128 MB free space for vmalloc.
 661          */
 662         if (memory_end > 1920*1024*1024)
 663                 memory_end = 1920*1024*1024;
 664 #else /* CONFIG_64BIT */
 665         memory_end &= ~0x200000UL;
 666 #endif /* CONFIG_64BIT */
 667
 668         setup_memory();
 669         setup_resources();
 670         setup_lowcore();
 671
 672         cpu_init();
 673         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 674         smp_setup_cpu_possible_map();
 675
 676         /*
 677          * Create kernel page tables and switch to virtual addressing.
 678          */
 679         paging_init();
 680
 681         /* Setup default console */
 682         conmode_default();
 683 }
 684
 685 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 686 {
 687    printk("cpu %d "
 688 #ifdef CONFIG_SMP
 689            "phys_idx=%d "
 690 #endif
 691            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 692            cpuinfo->cpu_nr,
 693 #ifdef CONFIG_SMP
 694            cpuinfo->cpu_addr,
 695 #endif
 696            cpuinfo->cpu_id.version,
 697            cpuinfo->cpu_id.ident,
 698            cpuinfo->cpu_id.machine,
 699            cpuinfo->cpu_id.unused);
 700 }
 701
 702 /*
 703  * show_cpuinfo - Get information on one CPU for use by procfs.
 704  */
 705
 706 static int show_cpuinfo(struct seq_file *m, void *v)
 707 {
 708         struct cpuinfo_S390 *cpuinfo;
 709         unsigned long n = (unsigned long) v - 1;
 710
 711         preempt_disable();
 712         if (!n) {
 713                 seq_printf(m, "vendor_id       : IBM/S390\n"
 714                                "# processors    : %i\n"
 715                                "bogomips per cpu: %lu.%02lu\n",
 716                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 717                                (loops_per_jiffy/(5000/HZ))%100);
 718         }
 719         if (cpu_online(n)) {
 720 #ifdef CONFIG_SMP
 721                 if (smp_processor_id() == n)
 722                         cpuinfo = &S390_lowcore.cpu_data;
 723                 else
 724                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 725 #else
 726                 cpuinfo = &S390_lowcore.cpu_data;
 727 #endif
 728                 seq_printf(m, "processor %li: "
 729                                "version = %02X,  "
 730                                "identification = %06X,  "
 731                                "machine = %04X\n",
 732                                n, cpuinfo->cpu_id.version,
 733                                cpuinfo->cpu_id.ident,
 734                                cpuinfo->cpu_id.machine);
 735         }
 736         preempt_enable();
 737         return 0;
 738 }
 739
 740 static void *c_start(struct seq_file *m, loff_t *pos)
 741 {
 742         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 743 }
 744 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 745 {
 746         ++*pos;
 747         return c_start(m, pos);
 748 }
 749 static void c_stop(struct seq_file *m, void *v)
 750 {
 751 }
 752 struct seq_operations cpuinfo_op = {
 753         .start  = c_start,
 754         .next   = c_next,
 755         .stop   = c_stop,
 756         .show   = show_cpuinfo,
 757 };
 758