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 #include <asm/compat.h>
  54
  55 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  56                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  57 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  58                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  59                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  60
  61 /*
  62  * User copy operations.
  63  */
  64 struct uaccess_ops uaccess;
  65 EXPORT_SYMBOL_GPL(uaccess);
  66
  67 /*
  68  * Machine setup..
  69  */
  70 unsigned int console_mode = 0;
  71 unsigned int console_devno = -1;
  72 unsigned int console_irq = -1;
  73 unsigned long machine_flags = 0;
  74
  75 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  76 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  77 static unsigned long __initdata memory_end;
  78
  79 /*
  80  * This is set up by the setup-routine at boot-time
  81  * for S390 need to find out, what we have to setup
  82  * using address 0x10400 ...
  83  */
  84
  85 #include <asm/setup.h>
  86
  87 static struct resource code_resource = {
  88         .name  = "Kernel code",
  89         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  90 };
  91
  92 static struct resource data_resource = {
  93         .name = "Kernel data",
  94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  95 };
  96
  97 /*
  98  * cpu_init() initializes state that is per-CPU.
  99  */
 100 void __devinit cpu_init (void)
 101 {
 102         int addr = hard_smp_processor_id();
 103
 104         /*
 105          * Store processor id in lowcore (used e.g. in timer_interrupt)
 106          */
 107         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 108         S390_lowcore.cpu_data.cpu_addr = addr;
 109
 110         /*
 111          * Force FPU initialization:
 112          */
 113         clear_thread_flag(TIF_USEDFPU);
 114         clear_used_math();
 115
 116         atomic_inc(&init_mm.mm_count);
 117         current->active_mm = &init_mm;
 118         if (current->mm)
 119                 BUG();
 120         enter_lazy_tlb(&init_mm, current);
 121 }
 122
 123 /*
 124  * VM halt and poweroff setup routines
 125  */
 126 char vmhalt_cmd[128] = "";
 127 char vmpoff_cmd[128] = "";
 128 static char vmpanic_cmd[128] = "";
 129
 130 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 131 {
 132         int sx, dx;
 133
 134         dx = 0;
 135         for (sx = 0; src[sx] != 0; sx++) {
 136                 if (src[sx] == '"') continue;
 137                 dst[dx++] = src[sx];
 138                 if (dx >= n) break;
 139         }
 140 }
 141
 142 static int __init vmhalt_setup(char *str)
 143 {
 144         strncpy_skip_quote(vmhalt_cmd, str, 127);
 145         vmhalt_cmd[127] = 0;
 146         return 1;
 147 }
 148
 149 __setup("vmhalt=", vmhalt_setup);
 150
 151 static int __init vmpoff_setup(char *str)
 152 {
 153         strncpy_skip_quote(vmpoff_cmd, str, 127);
 154         vmpoff_cmd[127] = 0;
 155         return 1;
 156 }
 157
 158 __setup("vmpoff=", vmpoff_setup);
 159
 160 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 161                           void *data)
 162 {
 163         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 164                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 165
 166         return NOTIFY_OK;
 167 }
 168
 169 #define PANIC_PRI_VMPANIC       0
 170
 171 static struct notifier_block vmpanic_nb = {
 172         .notifier_call = vmpanic_notify,
 173         .priority = PANIC_PRI_VMPANIC
 174 };
 175
 176 static int __init vmpanic_setup(char *str)
 177 {
 178         static int register_done __initdata = 0;
 179
 180         strncpy_skip_quote(vmpanic_cmd, str, 127);
 181         vmpanic_cmd[127] = 0;
 182         if (!register_done) {
 183                 register_done = 1;
 184                 atomic_notifier_chain_register(&panic_notifier_list,
 185                                                &vmpanic_nb);
 186         }
 187         return 1;
 188 }
 189
 190 __setup("vmpanic=", vmpanic_setup);
 191
 192 /*
 193  * condev= and conmode= setup parameter.
 194  */
 195
 196 static int __init condev_setup(char *str)
 197 {
 198         int vdev;
 199
 200         vdev = simple_strtoul(str, &str, 0);
 201         if (vdev >= 0 && vdev < 65536) {
 202                 console_devno = vdev;
 203                 console_irq = -1;
 204         }
 205         return 1;
 206 }
 207
 208 __setup("condev=", condev_setup);
 209
 210 static int __init conmode_setup(char *str)
 211 {
 212 #if defined(CONFIG_SCLP_CONSOLE)
 213         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 214                 SET_CONSOLE_SCLP;
 215 #endif
 216 #if defined(CONFIG_TN3215_CONSOLE)
 217         if (strncmp(str, "3215", 5) == 0)
 218                 SET_CONSOLE_3215;
 219 #endif
 220 #if defined(CONFIG_TN3270_CONSOLE)
 221         if (strncmp(str, "3270", 5) == 0)
 222                 SET_CONSOLE_3270;
 223 #endif
 224         return 1;
 225 }
 226
 227 __setup("conmode=", conmode_setup);
 228
 229 static void __init conmode_default(void)
 230 {
 231         char query_buffer[1024];
 232         char *ptr;
 233
 234         if (MACHINE_IS_VM) {
 235                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 236                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 237                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 238                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 239                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 240                 ptr = strstr(query_buffer, "CONMODE");
 241                 /*
 242                  * Set the conmode to 3215 so that the device recognition
 243                  * will set the cu_type of the console to 3215. If the
 244                  * conmode is 3270 and we don't set it back then both
 245                  * 3215 and the 3270 driver will try to access the console
 246                  * device (3215 as console and 3270 as normal tty).
 247                  */
 248                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 249                 if (ptr == NULL) {
 250 #if defined(CONFIG_SCLP_CONSOLE)
 251                         SET_CONSOLE_SCLP;
 252 #endif
 253                         return;
 254                 }
 255                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 256 #if defined(CONFIG_TN3270_CONSOLE)
 257                         SET_CONSOLE_3270;
 258 #elif defined(CONFIG_TN3215_CONSOLE)
 259                         SET_CONSOLE_3215;
 260 #elif defined(CONFIG_SCLP_CONSOLE)
 261                         SET_CONSOLE_SCLP;
 262 #endif
 263                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 264 #if defined(CONFIG_TN3215_CONSOLE)
 265                         SET_CONSOLE_3215;
 266 #elif defined(CONFIG_TN3270_CONSOLE)
 267                         SET_CONSOLE_3270;
 268 #elif defined(CONFIG_SCLP_CONSOLE)
 269                         SET_CONSOLE_SCLP;
 270 #endif
 271                 }
 272         } else if (MACHINE_IS_P390) {
 273 #if defined(CONFIG_TN3215_CONSOLE)
 274                 SET_CONSOLE_3215;
 275 #elif defined(CONFIG_TN3270_CONSOLE)
 276                 SET_CONSOLE_3270;
 277 #endif
 278         } else {
 279 #if defined(CONFIG_SCLP_CONSOLE)
 280                 SET_CONSOLE_SCLP;
 281 #endif
 282         }
 283 }
 284
 285 #ifdef CONFIG_SMP
 286 void (*_machine_restart)(char *command) = machine_restart_smp;
 287 void (*_machine_halt)(void) = machine_halt_smp;
 288 void (*_machine_power_off)(void) = machine_power_off_smp;
 289 #else
 290 /*
 291  * Reboot, halt and power_off routines for non SMP.
 292  */
 293 static void do_machine_restart_nonsmp(char * __unused)
 294 {
 295         do_reipl();
 296 }
 297
 298 static void do_machine_halt_nonsmp(void)
 299 {
 300         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 301                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 302         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 303 }
 304
 305 static void do_machine_power_off_nonsmp(void)
 306 {
 307         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 308                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 309         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 310 }
 311
 312 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 313 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 314 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 315 #endif
 316
 317  /*
 318  * Reboot, halt and power_off stubs. They just call _machine_restart,
 319  * _machine_halt or _machine_power_off.
 320  */
 321
 322 void machine_restart(char *command)
 323 {
 324         if (!in_interrupt() || oops_in_progress)
 325                 /*
 326                  * Only unblank the console if we are called in enabled
 327                  * context or a bust_spinlocks cleared the way for us.
 328                  */
 329                 console_unblank();
 330         _machine_restart(command);
 331 }
 332
 333 void machine_halt(void)
 334 {
 335         if (!in_interrupt() || oops_in_progress)
 336                 /*
 337                  * Only unblank the console if we are called in enabled
 338                  * context or a bust_spinlocks cleared the way for us.
 339                  */
 340                 console_unblank();
 341         _machine_halt();
 342 }
 343
 344 void machine_power_off(void)
 345 {
 346         if (!in_interrupt() || oops_in_progress)
 347                 /*
 348                  * Only unblank the console if we are called in enabled
 349                  * context or a bust_spinlocks cleared the way for us.
 350                  */
 351                 console_unblank();
 352         _machine_power_off();
 353 }
 354
 355 /*
 356  * Dummy power off function.
 357  */
 358 void (*pm_power_off)(void) = machine_power_off;
 359
 360 static int __init early_parse_mem(char *p)
 361 {
 362         memory_end = memparse(p, &p);
 363         return 0;
 364 }
 365 early_param("mem", early_parse_mem);
 366
 367 /*
 368  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 369  */
 370 static int __init early_parse_ipldelay(char *p)
 371 {
 372         unsigned long delay = 0;
 373
 374         delay = simple_strtoul(p, &p, 0);
 375
 376         switch (*p) {
 377         case 's':
 378         case 'S':
 379                 delay *= 1000000;
 380                 break;
 381         case 'm':
 382         case 'M':
 383                 delay *= 60 * 1000000;
 384         }
 385
 386         /* now wait for the requested amount of time */
 387         udelay(delay);
 388
 389         return 0;
 390 }
 391 early_param("ipldelay", early_parse_ipldelay);
 392
 393 #ifdef CONFIG_S390_SWITCH_AMODE
 394 unsigned int switch_amode = 0;
 395 EXPORT_SYMBOL_GPL(switch_amode);
 396
 397 static inline void set_amode_and_uaccess(unsigned long user_amode,
 398                                          unsigned long user32_amode)
 399 {
 400         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 401                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 402                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 403 #ifdef CONFIG_COMPAT
 404         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 405                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 406                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 407         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 408                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 409                           PSW32_MASK_PSTATE;
 410 #endif
 411         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 412                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 413
 414         if (MACHINE_HAS_MVCOS) {
 415                 printk("mvcos available.\n");
 416                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 417         } else {
 418                 printk("mvcos not available.\n");
 419                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 420         }
 421 }
 422
 423 /*
 424  * Switch kernel/user addressing modes?
 425  */
 426 static int __init early_parse_switch_amode(char *p)
 427 {
 428         switch_amode = 1;
 429         return 0;
 430 }
 431 early_param("switch_amode", early_parse_switch_amode);
 432
 433 #else /* CONFIG_S390_SWITCH_AMODE */
 434 static inline void set_amode_and_uaccess(unsigned long user_amode,
 435                                          unsigned long user32_amode)
 436 {
 437 }
 438 #endif /* CONFIG_S390_SWITCH_AMODE */
 439
 440 #ifdef CONFIG_S390_EXEC_PROTECT
 441 unsigned int s390_noexec = 0;
 442 EXPORT_SYMBOL_GPL(s390_noexec);
 443
 444 /*
 445  * Enable execute protection?
 446  */
 447 static int __init early_parse_noexec(char *p)
 448 {
 449         if (!strncmp(p, "off", 3))
 450                 return 0;
 451         switch_amode = 1;
 452         s390_noexec = 1;
 453         return 0;
 454 }
 455 early_param("noexec", early_parse_noexec);
 456 #endif /* CONFIG_S390_EXEC_PROTECT */
 457
 458 static void setup_addressing_mode(void)
 459 {
 460         if (s390_noexec) {
 461                 printk("S390 execute protection active, ");
 462                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 463                 return;
 464         }
 465         if (switch_amode) {
 466                 printk("S390 address spaces switched, ");
 467                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 468         }
 469 }
 470
 471 static void __init
 472 setup_lowcore(void)
 473 {
 474         struct _lowcore *lc;
 475         int lc_pages;
 476
 477         /*
 478          * Setup lowcore for boot cpu
 479          */
 480         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 481         lc = (struct _lowcore *)
 482                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 483         memset(lc, 0, lc_pages * PAGE_SIZE);
 484         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 485         lc->restart_psw.addr =
 486                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 487         if (switch_amode)
 488                 lc->restart_psw.mask |= PSW_ASC_HOME;
 489         lc->external_new_psw.mask = psw_kernel_bits;
 490         lc->external_new_psw.addr =
 491                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 492         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 493         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 494         lc->program_new_psw.mask = psw_kernel_bits;
 495         lc->program_new_psw.addr =
 496                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 497         lc->mcck_new_psw.mask =
 498                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 499         lc->mcck_new_psw.addr =
 500                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 501         lc->io_new_psw.mask = psw_kernel_bits;
 502         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 503         lc->ipl_device = S390_lowcore.ipl_device;
 504         lc->jiffy_timer = -1LL;
 505         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 506         lc->async_stack = (unsigned long)
 507                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 508         lc->panic_stack = (unsigned long)
 509                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 510         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 511         lc->thread_info = (unsigned long) &init_thread_union;
 512 #ifndef CONFIG_64BIT
 513         if (MACHINE_HAS_IEEE) {
 514                 lc->extended_save_area_addr = (__u32)
 515                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 516                 /* enable extended save area */
 517                 __ctl_set_bit(14, 29);
 518         }
 519 #endif
 520         set_prefix((u32)(unsigned long) lc);
 521 }
 522
 523 static void __init
 524 setup_resources(void)
 525 {
 526         struct resource *res;
 527         int i;
 528
 529         code_resource.start = (unsigned long) &_text;
 530         code_resource.end = (unsigned long) &_etext - 1;
 531         data_resource.start = (unsigned long) &_etext;
 532         data_resource.end = (unsigned long) &_edata - 1;
 533
 534         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 535                 res = alloc_bootmem_low(sizeof(struct resource));
 536                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 537                 switch (memory_chunk[i].type) {
 538                 case CHUNK_READ_WRITE:
 539                         res->name = "System RAM";
 540                         break;
 541                 case CHUNK_READ_ONLY:
 542                         res->name = "System ROM";
 543                         res->flags |= IORESOURCE_READONLY;
 544                         break;
 545                 default:
 546                         res->name = "reserved";
 547                 }
 548                 res->start = memory_chunk[i].addr;
 549                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 550                 request_resource(&iomem_resource, res);
 551                 request_resource(res, &code_resource);
 552                 request_resource(res, &data_resource);
 553         }
 554 }
 555
 556 static void __init setup_memory_end(void)
 557 {
 558         unsigned long real_size, memory_size;
 559         unsigned long max_mem, max_phys;
 560         int i;
 561
 562         memory_size = real_size = 0;
 563         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 564         memory_end &= PAGE_MASK;
 565
 566         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 567
 568         for (i = 0; i < MEMORY_CHUNKS; i++) {
 569                 struct mem_chunk *chunk = &memory_chunk[i];
 570
 571                 real_size = max(real_size, chunk->addr + chunk->size);
 572                 if (chunk->addr >= max_mem) {
 573                         memset(chunk, 0, sizeof(*chunk));
 574                         continue;
 575                 }
 576                 if (chunk->addr + chunk->size > max_mem)
 577                         chunk->size = max_mem - chunk->addr;
 578                 memory_size = max(memory_size, chunk->addr + chunk->size);
 579         }
 580         if (!memory_end)
 581                 memory_end = memory_size;
 582 }
 583
 584 static void __init
 585 setup_memory(void)
 586 {
 587         unsigned long bootmap_size;
 588         unsigned long start_pfn, end_pfn, init_pfn;
 589         int i;
 590
 591         /*
 592          * partially used pages are not usable - thus
 593          * we are rounding upwards:
 594          */
 595         start_pfn = PFN_UP(__pa(&_end));
 596         end_pfn = max_pfn = PFN_DOWN(memory_end);
 597
 598         /* Initialize storage key for kernel pages */
 599         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 600                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 601
 602 #ifdef CONFIG_BLK_DEV_INITRD
 603         /*
 604          * Move the initrd in case the bitmap of the bootmem allocater
 605          * would overwrite it.
 606          */
 607
 608         if (INITRD_START && INITRD_SIZE) {
 609                 unsigned long bmap_size;
 610                 unsigned long start;
 611
 612                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 613                 bmap_size = PFN_PHYS(bmap_size);
 614
 615                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 616                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 617
 618                         if (start + INITRD_SIZE > memory_end) {
 619                                 printk("initrd extends beyond end of memory "
 620                                        "(0x%08lx > 0x%08lx)\n"
 621                                        "disabling initrd\n",
 622                                        start + INITRD_SIZE, memory_end);
 623                                 INITRD_START = INITRD_SIZE = 0;
 624                         } else {
 625                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 626                                        "size: %ld)\n",
 627                                        INITRD_START, start, INITRD_SIZE);
 628                                 memmove((void *) start, (void *) INITRD_START,
 629                                         INITRD_SIZE);
 630                                 INITRD_START = start;
 631                         }
 632                 }
 633         }
 634 #endif
 635
 636         /*
 637          * Initialize the boot-time allocator
 638          */
 639         bootmap_size = init_bootmem(start_pfn, end_pfn);
 640
 641         /*
 642          * Register RAM areas with the bootmem allocator.
 643          */
 644
 645         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 646                 unsigned long start_chunk, end_chunk, pfn;
 647
 648                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 649                         continue;
 650                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 651                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 652                 end_chunk = min(end_chunk, end_pfn);
 653                 if (start_chunk >= end_chunk)
 654                         continue;
 655                 add_active_range(0, start_chunk, end_chunk);
 656                 pfn = max(start_chunk, start_pfn);
 657                 for (; pfn <= end_chunk; pfn++)
 658                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 659         }
 660
 661         psw_set_key(PAGE_DEFAULT_KEY);
 662
 663         free_bootmem_with_active_regions(0, max_pfn);
 664         reserve_bootmem(0, PFN_PHYS(start_pfn));
 665
 666         /*
 667          * Reserve the bootmem bitmap itself as well. We do this in two
 668          * steps (first step was init_bootmem()) because this catches
 669          * the (very unlikely) case of us accidentally initializing the
 670          * bootmem allocator with an invalid RAM area.
 671          */
 672         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 673
 674 #ifdef CONFIG_BLK_DEV_INITRD
 675         if (INITRD_START && INITRD_SIZE) {
 676                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 677                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 678                         initrd_start = INITRD_START;
 679                         initrd_end = initrd_start + INITRD_SIZE;
 680                 } else {
 681                         printk("initrd extends beyond end of memory "
 682                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 683                                initrd_start + INITRD_SIZE, memory_end);
 684                         initrd_start = initrd_end = 0;
 685                 }
 686         }
 687 #endif
 688 }
 689
 690 /*
 691  * Setup function called from init/main.c just after the banner
 692  * was printed.
 693  */
 694
 695 void __init
 696 setup_arch(char **cmdline_p)
 697 {
 698         /*
 699          * print what head.S has found out about the machine
 700          */
 701 #ifndef CONFIG_64BIT
 702         printk((MACHINE_IS_VM) ?
 703                "We are running under VM (31 bit mode)\n" :
 704                "We are running native (31 bit mode)\n");
 705         printk((MACHINE_HAS_IEEE) ?
 706                "This machine has an IEEE fpu\n" :
 707                "This machine has no IEEE fpu\n");
 708 #else /* CONFIG_64BIT */
 709         printk((MACHINE_IS_VM) ?
 710                "We are running under VM (64 bit mode)\n" :
 711                "We are running native (64 bit mode)\n");
 712 #endif /* CONFIG_64BIT */
 713
 714         /* Save unparsed command line copy for /proc/cmdline */
 715         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 716
 717         *cmdline_p = COMMAND_LINE;
 718         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 719
 720         ROOT_DEV = Root_RAM0;
 721
 722         init_mm.start_code = PAGE_OFFSET;
 723         init_mm.end_code = (unsigned long) &_etext;
 724         init_mm.end_data = (unsigned long) &_edata;
 725         init_mm.brk = (unsigned long) &_end;
 726
 727         if (MACHINE_HAS_MVCOS)
 728                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 729         else
 730                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 731
 732         parse_early_param();
 733
 734         setup_memory_end();
 735         setup_addressing_mode();
 736         setup_memory();
 737         setup_resources();
 738         setup_lowcore();
 739
 740         cpu_init();
 741         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 742         smp_setup_cpu_possible_map();
 743
 744         /*
 745          * Create kernel page tables and switch to virtual addressing.
 746          */
 747         paging_init();
 748
 749         /* Setup default console */
 750         conmode_default();
 751 }
 752
 753 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 754 {
 755    printk("cpu %d "
 756 #ifdef CONFIG_SMP
 757            "phys_idx=%d "
 758 #endif
 759            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 760            cpuinfo->cpu_nr,
 761 #ifdef CONFIG_SMP
 762            cpuinfo->cpu_addr,
 763 #endif
 764            cpuinfo->cpu_id.version,
 765            cpuinfo->cpu_id.ident,
 766            cpuinfo->cpu_id.machine,
 767            cpuinfo->cpu_id.unused);
 768 }
 769
 770 /*
 771  * show_cpuinfo - Get information on one CPU for use by procfs.
 772  */
 773
 774 static int show_cpuinfo(struct seq_file *m, void *v)
 775 {
 776         struct cpuinfo_S390 *cpuinfo;
 777         unsigned long n = (unsigned long) v - 1;
 778
 779         preempt_disable();
 780         if (!n) {
 781                 seq_printf(m, "vendor_id       : IBM/S390\n"
 782                                "# processors    : %i\n"
 783                                "bogomips per cpu: %lu.%02lu\n",
 784                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 785                                (loops_per_jiffy/(5000/HZ))%100);
 786         }
 787         if (cpu_online(n)) {
 788 #ifdef CONFIG_SMP
 789                 if (smp_processor_id() == n)
 790                         cpuinfo = &S390_lowcore.cpu_data;
 791                 else
 792                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 793 #else
 794                 cpuinfo = &S390_lowcore.cpu_data;
 795 #endif
 796                 seq_printf(m, "processor %li: "
 797                                "version = %02X,  "
 798                                "identification = %06X,  "
 799                                "machine = %04X\n",
 800                                n, cpuinfo->cpu_id.version,
 801                                cpuinfo->cpu_id.ident,
 802                                cpuinfo->cpu_id.machine);
 803         }
 804         preempt_enable();
 805         return 0;
 806 }
 807
 808 static void *c_start(struct seq_file *m, loff_t *pos)
 809 {
 810         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 811 }
 812 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 813 {
 814         ++*pos;
 815         return c_start(m, pos);
 816 }
 817 static void c_stop(struct seq_file *m, void *v)
 818 {
 819 }
 820 struct seq_operations cpuinfo_op = {
 821         .start  = c_start,
 822         .next   = c_next,
 823         .stop   = c_stop,
 824         .show   = show_cpuinfo,
 825 };
 826