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/tty.h>
  28 #include <linux/ioport.h>
  29 #include <linux/delay.h>
  30 #include <linux/init.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/root_dev.h>
  34 #include <linux/console.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/kernel_stat.h>
  37 #include <linux/device.h>
  38 #include <linux/notifier.h>
  39 #include <linux/pfn.h>
  40 #include <linux/ctype.h>
  41 #include <linux/reboot.h>
  42 #include <linux/topology.h>
  43
  44 #include <asm/ipl.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/system.h>
  47 #include <asm/smp.h>
  48 #include <asm/mmu_context.h>
  49 #include <asm/cpcmd.h>
  50 #include <asm/lowcore.h>
  51 #include <asm/irq.h>
  52 #include <asm/page.h>
  53 #include <asm/ptrace.h>
  54 #include <asm/sections.h>
  55 #include <asm/ebcdic.h>
  56 #include <asm/compat.h>
  57
  58 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  59                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  60 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  61                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  62                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  63
  64 /*
  65  * User copy operations.
  66  */
  67 struct uaccess_ops uaccess;
  68 EXPORT_SYMBOL(uaccess);
  69
  70 /*
  71  * Machine setup..
  72  */
  73 unsigned int console_mode = 0;
  74 unsigned int console_devno = -1;
  75 unsigned int console_irq = -1;
  76 unsigned long machine_flags;
  77 unsigned long elf_hwcap = 0;
  78 char elf_platform[ELF_PLATFORM_SIZE];
  79
  80 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  82 static unsigned long __initdata memory_end;
  83
  84 /*
  85  * This is set up by the setup-routine at boot-time
  86  * for S390 need to find out, what we have to setup
  87  * using address 0x10400 ...
  88  */
  89
  90 #include <asm/setup.h>
  91
  92 static struct resource code_resource = {
  93         .name  = "Kernel code",
  94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  95 };
  96
  97 static struct resource data_resource = {
  98         .name = "Kernel data",
  99         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 100 };
 101
 102 /*
 103  * cpu_init() initializes state that is per-CPU.
 104  */
 105 void __cpuinit cpu_init(void)
 106 {
 107         int addr = hard_smp_processor_id();
 108
 109         /*
 110          * Store processor id in lowcore (used e.g. in timer_interrupt)
 111          */
 112         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 113         S390_lowcore.cpu_data.cpu_addr = addr;
 114
 115         /*
 116          * Force FPU initialization:
 117          */
 118         clear_thread_flag(TIF_USEDFPU);
 119         clear_used_math();
 120
 121         atomic_inc(&init_mm.mm_count);
 122         current->active_mm = &init_mm;
 123         if (current->mm)
 124                 BUG();
 125         enter_lazy_tlb(&init_mm, current);
 126 }
 127
 128 /*
 129  * condev= and conmode= setup parameter.
 130  */
 131
 132 static int __init condev_setup(char *str)
 133 {
 134         int vdev;
 135
 136         vdev = simple_strtoul(str, &str, 0);
 137         if (vdev >= 0 && vdev < 65536) {
 138                 console_devno = vdev;
 139                 console_irq = -1;
 140         }
 141         return 1;
 142 }
 143
 144 __setup("condev=", condev_setup);
 145
 146 static int __init conmode_setup(char *str)
 147 {
 148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 149         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 150                 SET_CONSOLE_SCLP;
 151 #endif
 152 #if defined(CONFIG_TN3215_CONSOLE)
 153         if (strncmp(str, "3215", 5) == 0)
 154                 SET_CONSOLE_3215;
 155 #endif
 156 #if defined(CONFIG_TN3270_CONSOLE)
 157         if (strncmp(str, "3270", 5) == 0)
 158                 SET_CONSOLE_3270;
 159 #endif
 160         return 1;
 161 }
 162
 163 __setup("conmode=", conmode_setup);
 164
 165 static void __init conmode_default(void)
 166 {
 167         char query_buffer[1024];
 168         char *ptr;
 169
 170         if (MACHINE_IS_VM) {
 171                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 172                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 173                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 174                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 175                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 176                 ptr = strstr(query_buffer, "CONMODE");
 177                 /*
 178                  * Set the conmode to 3215 so that the device recognition
 179                  * will set the cu_type of the console to 3215. If the
 180                  * conmode is 3270 and we don't set it back then both
 181                  * 3215 and the 3270 driver will try to access the console
 182                  * device (3215 as console and 3270 as normal tty).
 183                  */
 184                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 185                 if (ptr == NULL) {
 186 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 187                         SET_CONSOLE_SCLP;
 188 #endif
 189                         return;
 190                 }
 191                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 192 #if defined(CONFIG_TN3270_CONSOLE)
 193                         SET_CONSOLE_3270;
 194 #elif defined(CONFIG_TN3215_CONSOLE)
 195                         SET_CONSOLE_3215;
 196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 197                         SET_CONSOLE_SCLP;
 198 #endif
 199                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 200 #if defined(CONFIG_TN3215_CONSOLE)
 201                         SET_CONSOLE_3215;
 202 #elif defined(CONFIG_TN3270_CONSOLE)
 203                         SET_CONSOLE_3270;
 204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 205                         SET_CONSOLE_SCLP;
 206 #endif
 207                 }
 208         } else {
 209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 210                 SET_CONSOLE_SCLP;
 211 #endif
 212         }
 213 }
 214
 215 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 216 static void __init setup_zfcpdump(unsigned int console_devno)
 217 {
 218         static char str[41];
 219
 220         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 221                 return;
 222         if (console_devno != -1)
 223                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 224                         ipl_info.data.fcp.dev_id.devno, console_devno);
 225         else
 226                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 227                         ipl_info.data.fcp.dev_id.devno);
 228         strcat(boot_command_line, str);
 229         console_loglevel = 2;
 230 }
 231 #else
 232 static inline void setup_zfcpdump(unsigned int console_devno) {}
 233 #endif /* CONFIG_ZFCPDUMP */
 234
 235  /*
 236  * Reboot, halt and power_off stubs. They just call _machine_restart,
 237  * _machine_halt or _machine_power_off.
 238  */
 239
 240 void machine_restart(char *command)
 241 {
 242         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 243                 /*
 244                  * Only unblank the console if we are called in enabled
 245                  * context or a bust_spinlocks cleared the way for us.
 246                  */
 247                 console_unblank();
 248         _machine_restart(command);
 249 }
 250
 251 void machine_halt(void)
 252 {
 253         if (!in_interrupt() || oops_in_progress)
 254                 /*
 255                  * Only unblank the console if we are called in enabled
 256                  * context or a bust_spinlocks cleared the way for us.
 257                  */
 258                 console_unblank();
 259         _machine_halt();
 260 }
 261
 262 void machine_power_off(void)
 263 {
 264         if (!in_interrupt() || oops_in_progress)
 265                 /*
 266                  * Only unblank the console if we are called in enabled
 267                  * context or a bust_spinlocks cleared the way for us.
 268                  */
 269                 console_unblank();
 270         _machine_power_off();
 271 }
 272
 273 /*
 274  * Dummy power off function.
 275  */
 276 void (*pm_power_off)(void) = machine_power_off;
 277
 278 static int __init early_parse_mem(char *p)
 279 {
 280         memory_end = memparse(p, &p);
 281         return 0;
 282 }
 283 early_param("mem", early_parse_mem);
 284
 285 #ifdef CONFIG_S390_SWITCH_AMODE
 286 #ifdef CONFIG_PGSTE
 287 unsigned int switch_amode = 1;
 288 #else
 289 unsigned int switch_amode = 0;
 290 #endif
 291 EXPORT_SYMBOL_GPL(switch_amode);
 292
 293 static void set_amode_and_uaccess(unsigned long user_amode,
 294                                   unsigned long user32_amode)
 295 {
 296         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 297                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 298                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 299 #ifdef CONFIG_COMPAT
 300         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 301                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 302                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 303         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 304                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 305                           PSW32_MASK_PSTATE;
 306 #endif
 307         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 308                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 309
 310         if (MACHINE_HAS_MVCOS) {
 311                 printk("mvcos available.\n");
 312                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 313         } else {
 314                 printk("mvcos not available.\n");
 315                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 316         }
 317 }
 318
 319 /*
 320  * Switch kernel/user addressing modes?
 321  */
 322 static int __init early_parse_switch_amode(char *p)
 323 {
 324         switch_amode = 1;
 325         return 0;
 326 }
 327 early_param("switch_amode", early_parse_switch_amode);
 328
 329 #else /* CONFIG_S390_SWITCH_AMODE */
 330 static inline void set_amode_and_uaccess(unsigned long user_amode,
 331                                          unsigned long user32_amode)
 332 {
 333 }
 334 #endif /* CONFIG_S390_SWITCH_AMODE */
 335
 336 #ifdef CONFIG_S390_EXEC_PROTECT
 337 unsigned int s390_noexec = 0;
 338 EXPORT_SYMBOL_GPL(s390_noexec);
 339
 340 /*
 341  * Enable execute protection?
 342  */
 343 static int __init early_parse_noexec(char *p)
 344 {
 345         if (!strncmp(p, "off", 3))
 346                 return 0;
 347         switch_amode = 1;
 348         s390_noexec = 1;
 349         return 0;
 350 }
 351 early_param("noexec", early_parse_noexec);
 352 #endif /* CONFIG_S390_EXEC_PROTECT */
 353
 354 static void setup_addressing_mode(void)
 355 {
 356         if (s390_noexec) {
 357                 printk("S390 execute protection active, ");
 358                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 359         } else if (switch_amode) {
 360                 printk("S390 address spaces switched, ");
 361                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 362         }
 363 #ifdef CONFIG_TRACE_IRQFLAGS
 364         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 365         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 366 #endif
 367 }
 368
 369 static void __init
 370 setup_lowcore(void)
 371 {
 372         struct _lowcore *lc;
 373         int lc_pages;
 374
 375         /*
 376          * Setup lowcore for boot cpu
 377          */
 378         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 379         lc = (struct _lowcore *)
 380                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 381         memset(lc, 0, lc_pages * PAGE_SIZE);
 382         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 383         lc->restart_psw.addr =
 384                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 385         if (switch_amode)
 386                 lc->restart_psw.mask |= PSW_ASC_HOME;
 387         lc->external_new_psw.mask = psw_kernel_bits;
 388         lc->external_new_psw.addr =
 389                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 390         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 391         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 392         lc->program_new_psw.mask = psw_kernel_bits;
 393         lc->program_new_psw.addr =
 394                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 395         lc->mcck_new_psw.mask =
 396                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 397         lc->mcck_new_psw.addr =
 398                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 399         lc->io_new_psw.mask = psw_kernel_bits;
 400         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 401         lc->ipl_device = S390_lowcore.ipl_device;
 402         lc->clock_comparator = -1ULL;
 403         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 404         lc->async_stack = (unsigned long)
 405                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 406         lc->panic_stack = (unsigned long)
 407                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 408         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 409         lc->thread_info = (unsigned long) &init_thread_union;
 410 #ifndef CONFIG_64BIT
 411         if (MACHINE_HAS_IEEE) {
 412                 lc->extended_save_area_addr = (__u32)
 413                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 414                 /* enable extended save area */
 415                 __ctl_set_bit(14, 29);
 416         }
 417 #endif
 418         set_prefix((u32)(unsigned long) lc);
 419 }
 420
 421 static void __init
 422 setup_resources(void)
 423 {
 424         struct resource *res, *sub_res;
 425         int i;
 426
 427         code_resource.start = (unsigned long) &_text;
 428         code_resource.end = (unsigned long) &_etext - 1;
 429         data_resource.start = (unsigned long) &_etext;
 430         data_resource.end = (unsigned long) &_edata - 1;
 431
 432         for (i = 0; i < MEMORY_CHUNKS; i++) {
 433                 if (!memory_chunk[i].size)
 434                         continue;
 435                 res = alloc_bootmem_low(sizeof(struct resource));
 436                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 437                 switch (memory_chunk[i].type) {
 438                 case CHUNK_READ_WRITE:
 439                         res->name = "System RAM";
 440                         break;
 441                 case CHUNK_READ_ONLY:
 442                         res->name = "System ROM";
 443                         res->flags |= IORESOURCE_READONLY;
 444                         break;
 445                 default:
 446                         res->name = "reserved";
 447                 }
 448                 res->start = memory_chunk[i].addr;
 449                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 450                 request_resource(&iomem_resource, res);
 451
 452                 if (code_resource.start >= res->start  &&
 453                         code_resource.start <= res->end &&
 454                         code_resource.end > res->end) {
 455                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 456                         memcpy(sub_res, &code_resource,
 457                                 sizeof(struct resource));
 458                         sub_res->end = res->end;
 459                         code_resource.start = res->end + 1;
 460                         request_resource(res, sub_res);
 461                 }
 462
 463                 if (code_resource.start >= res->start &&
 464                         code_resource.start <= res->end &&
 465                         code_resource.end <= res->end)
 466                         request_resource(res, &code_resource);
 467
 468                 if (data_resource.start >= res->start &&
 469                         data_resource.start <= res->end &&
 470                         data_resource.end > res->end) {
 471                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 472                         memcpy(sub_res, &data_resource,
 473                                 sizeof(struct resource));
 474                         sub_res->end = res->end;
 475                         data_resource.start = res->end + 1;
 476                         request_resource(res, sub_res);
 477                 }
 478
 479                 if (data_resource.start >= res->start &&
 480                         data_resource.start <= res->end &&
 481                         data_resource.end <= res->end)
 482                         request_resource(res, &data_resource);
 483         }
 484 }
 485
 486 unsigned long real_memory_size;
 487 EXPORT_SYMBOL_GPL(real_memory_size);
 488
 489 static void __init setup_memory_end(void)
 490 {
 491         unsigned long memory_size;
 492         unsigned long max_mem;
 493         int i;
 494
 495 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 496         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 497                 memory_end = ZFCPDUMP_HSA_SIZE;
 498 #endif
 499         memory_size = 0;
 500         memory_end &= PAGE_MASK;
 501
 502         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 503         memory_end = min(max_mem, memory_end);
 504
 505         /*
 506          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 507          * extra checks that HOLES_IN_ZONE would require.
 508          */
 509         for (i = 0; i < MEMORY_CHUNKS; i++) {
 510                 unsigned long start, end;
 511                 struct mem_chunk *chunk;
 512                 unsigned long align;
 513
 514                 chunk = &memory_chunk[i];
 515                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 516                 start = (chunk->addr + align - 1) & ~(align - 1);
 517                 end = (chunk->addr + chunk->size) & ~(align - 1);
 518                 if (start >= end)
 519                         memset(chunk, 0, sizeof(*chunk));
 520                 else {
 521                         chunk->addr = start;
 522                         chunk->size = end - start;
 523                 }
 524         }
 525
 526         for (i = 0; i < MEMORY_CHUNKS; i++) {
 527                 struct mem_chunk *chunk = &memory_chunk[i];
 528
 529                 real_memory_size = max(real_memory_size,
 530                                        chunk->addr + chunk->size);
 531                 if (chunk->addr >= max_mem) {
 532                         memset(chunk, 0, sizeof(*chunk));
 533                         continue;
 534                 }
 535                 if (chunk->addr + chunk->size > max_mem)
 536                         chunk->size = max_mem - chunk->addr;
 537                 memory_size = max(memory_size, chunk->addr + chunk->size);
 538         }
 539         if (!memory_end)
 540                 memory_end = memory_size;
 541 }
 542
 543 static void __init
 544 setup_memory(void)
 545 {
 546         unsigned long bootmap_size;
 547         unsigned long start_pfn, end_pfn;
 548         int i;
 549
 550         /*
 551          * partially used pages are not usable - thus
 552          * we are rounding upwards:
 553          */
 554         start_pfn = PFN_UP(__pa(&_end));
 555         end_pfn = max_pfn = PFN_DOWN(memory_end);
 556
 557 #ifdef CONFIG_BLK_DEV_INITRD
 558         /*
 559          * Move the initrd in case the bitmap of the bootmem allocater
 560          * would overwrite it.
 561          */
 562
 563         if (INITRD_START && INITRD_SIZE) {
 564                 unsigned long bmap_size;
 565                 unsigned long start;
 566
 567                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 568                 bmap_size = PFN_PHYS(bmap_size);
 569
 570                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 571                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 572
 573                         if (start + INITRD_SIZE > memory_end) {
 574                                 printk("initrd extends beyond end of memory "
 575                                        "(0x%08lx > 0x%08lx)\n"
 576                                        "disabling initrd\n",
 577                                        start + INITRD_SIZE, memory_end);
 578                                 INITRD_START = INITRD_SIZE = 0;
 579                         } else {
 580                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 581                                        "size: %ld)\n",
 582                                        INITRD_START, start, INITRD_SIZE);
 583                                 memmove((void *) start, (void *) INITRD_START,
 584                                         INITRD_SIZE);
 585                                 INITRD_START = start;
 586                         }
 587                 }
 588         }
 589 #endif
 590
 591         /*
 592          * Initialize the boot-time allocator
 593          */
 594         bootmap_size = init_bootmem(start_pfn, end_pfn);
 595
 596         /*
 597          * Register RAM areas with the bootmem allocator.
 598          */
 599
 600         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 601                 unsigned long start_chunk, end_chunk, pfn;
 602
 603                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 604                         continue;
 605                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 606                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 607                 end_chunk = min(end_chunk, end_pfn);
 608                 if (start_chunk >= end_chunk)
 609                         continue;
 610                 add_active_range(0, start_chunk, end_chunk);
 611                 pfn = max(start_chunk, start_pfn);
 612                 for (; pfn <= end_chunk; pfn++)
 613                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 614         }
 615
 616         psw_set_key(PAGE_DEFAULT_KEY);
 617
 618         free_bootmem_with_active_regions(0, max_pfn);
 619
 620         /*
 621          * Reserve memory used for lowcore/command line/kernel image.
 622          */
 623         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 624         reserve_bootmem((unsigned long)_stext,
 625                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 626                         BOOTMEM_DEFAULT);
 627         /*
 628          * Reserve the bootmem bitmap itself as well. We do this in two
 629          * steps (first step was init_bootmem()) because this catches
 630          * the (very unlikely) case of us accidentally initializing the
 631          * bootmem allocator with an invalid RAM area.
 632          */
 633         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 634                         BOOTMEM_DEFAULT);
 635
 636 #ifdef CONFIG_BLK_DEV_INITRD
 637         if (INITRD_START && INITRD_SIZE) {
 638                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 639                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 640                                         BOOTMEM_DEFAULT);
 641                         initrd_start = INITRD_START;
 642                         initrd_end = initrd_start + INITRD_SIZE;
 643                 } else {
 644                         printk("initrd extends beyond end of memory "
 645                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 646                                initrd_start + INITRD_SIZE, memory_end);
 647                         initrd_start = initrd_end = 0;
 648                 }
 649         }
 650 #endif
 651 }
 652
 653 static int __init __stfle(unsigned long long *list, int doublewords)
 654 {
 655         typedef struct { unsigned long long _[doublewords]; } addrtype;
 656         register unsigned long __nr asm("0") = doublewords - 1;
 657
 658         asm volatile(".insn s,0xb2b00000,%0" /* stfle */
 659                      : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
 660         return __nr + 1;
 661 }
 662
 663 int __init stfle(unsigned long long *list, int doublewords)
 664 {
 665         if (!(stfl() & (1UL << 24)))
 666                 return -EOPNOTSUPP;
 667         return __stfle(list, doublewords);
 668 }
 669
 670 /*
 671  * Setup hardware capabilities.
 672  */
 673 static void __init setup_hwcaps(void)
 674 {
 675         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 676         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 677         unsigned long long facility_list_extended;
 678         unsigned int facility_list;
 679         int i;
 680
 681         facility_list = stfl();
 682         /*
 683          * The store facility list bits numbers as found in the principles
 684          * of operation are numbered with bit 1UL<<31 as number 0 to
 685          * bit 1UL<<0 as number 31.
 686          *   Bit 0: instructions named N3, "backported" to esa-mode
 687          *   Bit 2: z/Architecture mode is active
 688          *   Bit 7: the store-facility-list-extended facility is installed
 689          *   Bit 17: the message-security assist is installed
 690          *   Bit 19: the long-displacement facility is installed
 691          *   Bit 21: the extended-immediate facility is installed
 692          * These get translated to:
 693          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 694          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 695          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 696          */
 697         for (i = 0; i < 6; i++)
 698                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 699                         elf_hwcap |= 1UL << i;
 700
 701         /*
 702          * Check for additional facilities with store-facility-list-extended.
 703          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 704          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 705          * as stored by stfl, bits 32-xxx contain additional facilities.
 706          * How many facility words are stored depends on the number of
 707          * doublewords passed to the instruction. The additional facilites
 708          * are:
 709          *   Bit 43: decimal floating point facility is installed
 710          * translated to:
 711          *   HWCAP_S390_DFP bit 6.
 712          */
 713         if ((elf_hwcap & (1UL << 2)) &&
 714             __stfle(&facility_list_extended, 1) > 0) {
 715                 if (facility_list_extended & (1ULL << (64 - 43)))
 716                         elf_hwcap |= 1UL << 6;
 717         }
 718
 719         if (MACHINE_HAS_HPAGE)
 720                 elf_hwcap |= 1UL << 7;
 721
 722         switch (cpuinfo->cpu_id.machine) {
 723         case 0x9672:
 724 #if !defined(CONFIG_64BIT)
 725         default:        /* Use "g5" as default for 31 bit kernels. */
 726 #endif
 727                 strcpy(elf_platform, "g5");
 728                 break;
 729         case 0x2064:
 730         case 0x2066:
 731 #if defined(CONFIG_64BIT)
 732         default:        /* Use "z900" as default for 64 bit kernels. */
 733 #endif
 734                 strcpy(elf_platform, "z900");
 735                 break;
 736         case 0x2084:
 737         case 0x2086:
 738                 strcpy(elf_platform, "z990");
 739                 break;
 740         case 0x2094:
 741                 strcpy(elf_platform, "z9-109");
 742                 break;
 743         }
 744 }
 745
 746 /*
 747  * Setup function called from init/main.c just after the banner
 748  * was printed.
 749  */
 750
 751 void __init
 752 setup_arch(char **cmdline_p)
 753 {
 754         /*
 755          * print what head.S has found out about the machine
 756          */
 757 #ifndef CONFIG_64BIT
 758         printk((MACHINE_IS_VM) ?
 759                "We are running under VM (31 bit mode)\n" :
 760                "We are running native (31 bit mode)\n");
 761         printk((MACHINE_HAS_IEEE) ?
 762                "This machine has an IEEE fpu\n" :
 763                "This machine has no IEEE fpu\n");
 764 #else /* CONFIG_64BIT */
 765         if (MACHINE_IS_VM)
 766                 printk("We are running under VM (64 bit mode)\n");
 767         else if (MACHINE_IS_KVM) {
 768                 printk("We are running under KVM (64 bit mode)\n");
 769                 add_preferred_console("ttyS", 1, NULL);
 770         } else
 771                 printk("We are running native (64 bit mode)\n");
 772 #endif /* CONFIG_64BIT */
 773
 774         /* Have one command line that is parsed and saved in /proc/cmdline */
 775         /* boot_command_line has been already set up in early.c */
 776         *cmdline_p = boot_command_line;
 777
 778         ROOT_DEV = Root_RAM0;
 779
 780         init_mm.start_code = PAGE_OFFSET;
 781         init_mm.end_code = (unsigned long) &_etext;
 782         init_mm.end_data = (unsigned long) &_edata;
 783         init_mm.brk = (unsigned long) &_end;
 784
 785         if (MACHINE_HAS_MVCOS)
 786                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 787         else
 788                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 789
 790         parse_early_param();
 791
 792         setup_ipl();
 793         setup_memory_end();
 794         setup_addressing_mode();
 795         setup_memory();
 796         setup_resources();
 797         setup_lowcore();
 798
 799         cpu_init();
 800         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 801         s390_init_cpu_topology();
 802
 803         /*
 804          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 805          */
 806         setup_hwcaps();
 807
 808         /*
 809          * Create kernel page tables and switch to virtual addressing.
 810          */
 811         paging_init();
 812
 813         /* Setup default console */
 814         conmode_default();
 815
 816         /* Setup zfcpdump support */
 817         setup_zfcpdump(console_devno);
 818 }
 819
 820 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 821 {
 822    printk(KERN_INFO "cpu %d "
 823 #ifdef CONFIG_SMP
 824            "phys_idx=%d "
 825 #endif
 826            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 827            cpuinfo->cpu_nr,
 828 #ifdef CONFIG_SMP
 829            cpuinfo->cpu_addr,
 830 #endif
 831            cpuinfo->cpu_id.version,
 832            cpuinfo->cpu_id.ident,
 833            cpuinfo->cpu_id.machine,
 834            cpuinfo->cpu_id.unused);
 835 }
 836
 837 /*
 838  * show_cpuinfo - Get information on one CPU for use by procfs.
 839  */
 840
 841 static int show_cpuinfo(struct seq_file *m, void *v)
 842 {
 843         static const char *hwcap_str[8] = {
 844                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 845                 "edat"
 846         };
 847         struct cpuinfo_S390 *cpuinfo;
 848         unsigned long n = (unsigned long) v - 1;
 849         int i;
 850
 851         s390_adjust_jiffies();
 852         preempt_disable();
 853         if (!n) {
 854                 seq_printf(m, "vendor_id       : IBM/S390\n"
 855                                "# processors    : %i\n"
 856                                "bogomips per cpu: %lu.%02lu\n",
 857                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 858                                (loops_per_jiffy/(5000/HZ))%100);
 859                 seq_puts(m, "features\t: ");
 860                 for (i = 0; i < 8; i++)
 861                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 862                                 seq_printf(m, "%s ", hwcap_str[i]);
 863                 seq_puts(m, "\n");
 864         }
 865
 866         if (cpu_online(n)) {
 867 #ifdef CONFIG_SMP
 868                 if (smp_processor_id() == n)
 869                         cpuinfo = &S390_lowcore.cpu_data;
 870                 else
 871                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 872 #else
 873                 cpuinfo = &S390_lowcore.cpu_data;
 874 #endif
 875                 seq_printf(m, "processor %li: "
 876                                "version = %02X,  "
 877                                "identification = %06X,  "
 878                                "machine = %04X\n",
 879                                n, cpuinfo->cpu_id.version,
 880                                cpuinfo->cpu_id.ident,
 881                                cpuinfo->cpu_id.machine);
 882         }
 883         preempt_enable();
 884         return 0;
 885 }
 886
 887 static void *c_start(struct seq_file *m, loff_t *pos)
 888 {
 889         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 890 }
 891 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 892 {
 893         ++*pos;
 894         return c_start(m, pos);
 895 }
 896 static void c_stop(struct seq_file *m, void *v)
 897 {
 898 }
 899 const struct seq_operations cpuinfo_op = {
 900         .start  = c_start,
 901         .next   = c_next,
 902         .stop   = c_stop,
 903         .show   = show_cpuinfo,
 904 };
 905