arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) IBM Corp. 1999,2010
   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 #define KMSG_COMPONENT "setup"
  18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  19
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/sched.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/stddef.h>
  26 #include <linux/unistd.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/user.h>
  29 #include <linux/tty.h>
  30 #include <linux/ioport.h>
  31 #include <linux/delay.h>
  32 #include <linux/init.h>
  33 #include <linux/initrd.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/root_dev.h>
  36 #include <linux/console.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/ctype.h>
  42 #include <linux/reboot.h>
  43 #include <linux/topology.h>
  44 #include <linux/ftrace.h>
  45 #include <linux/compat.h>
  46
  47 #include <asm/ipl.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/system.h>
  50 #include <asm/smp.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/cpcmd.h>
  53 #include <asm/lowcore.h>
  54 #include <asm/irq.h>
  55 #include <asm/page.h>
  56 #include <asm/ptrace.h>
  57 #include <asm/sections.h>
  58 #include <asm/ebcdic.h>
  59 #include <asm/compat.h>
  60 #include <asm/kvm_virtio.h>
  61
  62 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  63                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  64 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  65                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  66                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  67
  68 /*
  69  * User copy operations.
  70  */
  71 struct uaccess_ops uaccess;
  72 EXPORT_SYMBOL(uaccess);
  73
  74 /*
  75  * Machine setup..
  76  */
  77 unsigned int console_mode = 0;
  78 EXPORT_SYMBOL(console_mode);
  79
  80 unsigned int console_devno = -1;
  81 EXPORT_SYMBOL(console_devno);
  82
  83 unsigned int console_irq = -1;
  84 EXPORT_SYMBOL(console_irq);
  85
  86 unsigned long elf_hwcap = 0;
  87 char elf_platform[ELF_PLATFORM_SIZE];
  88
  89 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  90
  91 int __initdata memory_end_set;
  92 unsigned long __initdata memory_end;
  93
  94 /* An array with a pointer to the lowcore of every CPU. */
  95 struct _lowcore *lowcore_ptr[NR_CPUS];
  96 EXPORT_SYMBOL(lowcore_ptr);
  97
  98 /*
  99  * This is set up by the setup-routine at boot-time
 100  * for S390 need to find out, what we have to setup
 101  * using address 0x10400 ...
 102  */
 103
 104 #include <asm/setup.h>
 105
 106 /*
 107  * condev= and conmode= setup parameter.
 108  */
 109
 110 static int __init condev_setup(char *str)
 111 {
 112         int vdev;
 113
 114         vdev = simple_strtoul(str, &str, 0);
 115         if (vdev >= 0 && vdev < 65536) {
 116                 console_devno = vdev;
 117                 console_irq = -1;
 118         }
 119         return 1;
 120 }
 121
 122 __setup("condev=", condev_setup);
 123
 124 static void __init set_preferred_console(void)
 125 {
 126         if (MACHINE_IS_KVM)
 127                 add_preferred_console("hvc", 0, NULL);
 128         else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 129                 add_preferred_console("ttyS", 0, NULL);
 130         else if (CONSOLE_IS_3270)
 131                 add_preferred_console("tty3270", 0, NULL);
 132 }
 133
 134 static int __init conmode_setup(char *str)
 135 {
 136 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 137         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 138                 SET_CONSOLE_SCLP;
 139 #endif
 140 #if defined(CONFIG_TN3215_CONSOLE)
 141         if (strncmp(str, "3215", 5) == 0)
 142                 SET_CONSOLE_3215;
 143 #endif
 144 #if defined(CONFIG_TN3270_CONSOLE)
 145         if (strncmp(str, "3270", 5) == 0)
 146                 SET_CONSOLE_3270;
 147 #endif
 148         set_preferred_console();
 149         return 1;
 150 }
 151
 152 __setup("conmode=", conmode_setup);
 153
 154 static void __init conmode_default(void)
 155 {
 156         char query_buffer[1024];
 157         char *ptr;
 158
 159         if (MACHINE_IS_VM) {
 160                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 161                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 162                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 163                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 164                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 165                 ptr = strstr(query_buffer, "CONMODE");
 166                 /*
 167                  * Set the conmode to 3215 so that the device recognition
 168                  * will set the cu_type of the console to 3215. If the
 169                  * conmode is 3270 and we don't set it back then both
 170                  * 3215 and the 3270 driver will try to access the console
 171                  * device (3215 as console and 3270 as normal tty).
 172                  */
 173                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 174                 if (ptr == NULL) {
 175 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 176                         SET_CONSOLE_SCLP;
 177 #endif
 178                         return;
 179                 }
 180                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 181 #if defined(CONFIG_TN3270_CONSOLE)
 182                         SET_CONSOLE_3270;
 183 #elif defined(CONFIG_TN3215_CONSOLE)
 184                         SET_CONSOLE_3215;
 185 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 186                         SET_CONSOLE_SCLP;
 187 #endif
 188                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 189 #if defined(CONFIG_TN3215_CONSOLE)
 190                         SET_CONSOLE_3215;
 191 #elif defined(CONFIG_TN3270_CONSOLE)
 192                         SET_CONSOLE_3270;
 193 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 194                         SET_CONSOLE_SCLP;
 195 #endif
 196                 }
 197         } else {
 198 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 199                 SET_CONSOLE_SCLP;
 200 #endif
 201         }
 202 }
 203
 204 #ifdef CONFIG_ZFCPDUMP
 205 static void __init setup_zfcpdump(unsigned int console_devno)
 206 {
 207         static char str[41];
 208
 209         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 210                 return;
 211         if (console_devno != -1)
 212                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 213                         ipl_info.data.fcp.dev_id.devno, console_devno);
 214         else
 215                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 216                         ipl_info.data.fcp.dev_id.devno);
 217         strcat(boot_command_line, str);
 218         console_loglevel = 2;
 219 }
 220 #else
 221 static inline void setup_zfcpdump(unsigned int console_devno) {}
 222 #endif /* CONFIG_ZFCPDUMP */
 223
 224  /*
 225  * Reboot, halt and power_off stubs. They just call _machine_restart,
 226  * _machine_halt or _machine_power_off.
 227  */
 228
 229 void machine_restart(char *command)
 230 {
 231         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 232                 /*
 233                  * Only unblank the console if we are called in enabled
 234                  * context or a bust_spinlocks cleared the way for us.
 235                  */
 236                 console_unblank();
 237         _machine_restart(command);
 238 }
 239
 240 void machine_halt(void)
 241 {
 242         if (!in_interrupt() || 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_halt();
 249 }
 250
 251 void machine_power_off(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_power_off();
 260 }
 261
 262 /*
 263  * Dummy power off function.
 264  */
 265 void (*pm_power_off)(void) = machine_power_off;
 266
 267 static int __init early_parse_mem(char *p)
 268 {
 269         memory_end = memparse(p, &p);
 270         memory_end_set = 1;
 271         return 0;
 272 }
 273 early_param("mem", early_parse_mem);
 274
 275 unsigned int user_mode = HOME_SPACE_MODE;
 276 EXPORT_SYMBOL_GPL(user_mode);
 277
 278 static int set_amode_and_uaccess(unsigned long user_amode,
 279                                  unsigned long user32_amode)
 280 {
 281         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 282                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 283                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 284 #ifdef CONFIG_COMPAT
 285         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 286                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 287                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 288         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 289                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 290                           PSW32_MASK_PSTATE;
 291 #endif
 292         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 293                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 294
 295         if (MACHINE_HAS_MVCOS) {
 296                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 297                 return 1;
 298         } else {
 299                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 300                 return 0;
 301         }
 302 }
 303
 304 /*
 305  * Switch kernel/user addressing modes?
 306  */
 307 static int __init early_parse_switch_amode(char *p)
 308 {
 309         user_mode = PRIMARY_SPACE_MODE;
 310         return 0;
 311 }
 312 early_param("switch_amode", early_parse_switch_amode);
 313
 314 static int __init early_parse_user_mode(char *p)
 315 {
 316         if (p && strcmp(p, "primary") == 0)
 317                 user_mode = PRIMARY_SPACE_MODE;
 318         else if (!p || strcmp(p, "home") == 0)
 319                 user_mode = HOME_SPACE_MODE;
 320         else
 321                 return 1;
 322         return 0;
 323 }
 324 early_param("user_mode", early_parse_user_mode);
 325
 326 static void setup_addressing_mode(void)
 327 {
 328         if (user_mode == PRIMARY_SPACE_MODE) {
 329                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 330                         pr_info("Address spaces switched, "
 331                                 "mvcos available\n");
 332                 else
 333                         pr_info("Address spaces switched, "
 334                                 "mvcos not available\n");
 335         }
 336 }
 337
 338 static void __init
 339 setup_lowcore(void)
 340 {
 341         struct _lowcore *lc;
 342
 343         /*
 344          * Setup lowcore for boot cpu
 345          */
 346         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 347         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 348         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 349         lc->restart_psw.addr =
 350                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 351         if (user_mode != HOME_SPACE_MODE)
 352                 lc->restart_psw.mask |= PSW_ASC_HOME;
 353         lc->external_new_psw.mask = psw_kernel_bits;
 354         lc->external_new_psw.addr =
 355                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 356         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 357         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 358         lc->program_new_psw.mask = psw_kernel_bits;
 359         lc->program_new_psw.addr =
 360                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 361         lc->mcck_new_psw.mask =
 362                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 363         lc->mcck_new_psw.addr =
 364                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 365         lc->io_new_psw.mask = psw_kernel_bits;
 366         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 367         lc->clock_comparator = -1ULL;
 368         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 369         lc->async_stack = (unsigned long)
 370                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 371         lc->panic_stack = (unsigned long)
 372                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 373         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 374         lc->thread_info = (unsigned long) &init_thread_union;
 375         lc->machine_flags = S390_lowcore.machine_flags;
 376         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 377         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 378                MAX_FACILITY_BIT/8);
 379 #ifndef CONFIG_64BIT
 380         if (MACHINE_HAS_IEEE) {
 381                 lc->extended_save_area_addr = (__u32)
 382                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 383                 /* enable extended save area */
 384                 __ctl_set_bit(14, 29);
 385         }
 386 #else
 387         lc->cmf_hpp = -1ULL;
 388         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 389 #endif
 390         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 391         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 392         lc->exit_timer = S390_lowcore.exit_timer;
 393         lc->user_timer = S390_lowcore.user_timer;
 394         lc->system_timer = S390_lowcore.system_timer;
 395         lc->steal_timer = S390_lowcore.steal_timer;
 396         lc->last_update_timer = S390_lowcore.last_update_timer;
 397         lc->last_update_clock = S390_lowcore.last_update_clock;
 398         lc->ftrace_func = S390_lowcore.ftrace_func;
 399         set_prefix((u32)(unsigned long) lc);
 400         lowcore_ptr[0] = lc;
 401 }
 402
 403 static struct resource code_resource = {
 404         .name  = "Kernel code",
 405         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 406 };
 407
 408 static struct resource data_resource = {
 409         .name = "Kernel data",
 410         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 411 };
 412
 413 static struct resource bss_resource = {
 414         .name = "Kernel bss",
 415         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 416 };
 417
 418 static struct resource __initdata *standard_resources[] = {
 419         &code_resource,
 420         &data_resource,
 421         &bss_resource,
 422 };
 423
 424 static void __init setup_resources(void)
 425 {
 426         struct resource *res, *std_res, *sub_res;
 427         int i, j;
 428
 429         code_resource.start = (unsigned long) &_text;
 430         code_resource.end = (unsigned long) &_etext - 1;
 431         data_resource.start = (unsigned long) &_etext;
 432         data_resource.end = (unsigned long) &_edata - 1;
 433         bss_resource.start = (unsigned long) &__bss_start;
 434         bss_resource.end = (unsigned long) &__bss_stop - 1;
 435
 436         for (i = 0; i < MEMORY_CHUNKS; i++) {
 437                 if (!memory_chunk[i].size)
 438                         continue;
 439                 res = alloc_bootmem_low(sizeof(*res));
 440                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 441                 switch (memory_chunk[i].type) {
 442                 case CHUNK_READ_WRITE:
 443                         res->name = "System RAM";
 444                         break;
 445                 case CHUNK_READ_ONLY:
 446                         res->name = "System ROM";
 447                         res->flags |= IORESOURCE_READONLY;
 448                         break;
 449                 default:
 450                         res->name = "reserved";
 451                 }
 452                 res->start = memory_chunk[i].addr;
 453                 res->end = res->start + memory_chunk[i].size - 1;
 454                 request_resource(&iomem_resource, res);
 455
 456                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 457                         std_res = standard_resources[j];
 458                         if (std_res->start < res->start ||
 459                             std_res->start > res->end)
 460                                 continue;
 461                         if (std_res->end > res->end) {
 462                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 463                                 *sub_res = *std_res;
 464                                 sub_res->end = res->end;
 465                                 std_res->start = res->end + 1;
 466                                 request_resource(res, sub_res);
 467                         } else {
 468                                 request_resource(res, std_res);
 469                         }
 470                 }
 471         }
 472 }
 473
 474 unsigned long real_memory_size;
 475 EXPORT_SYMBOL_GPL(real_memory_size);
 476
 477 static void __init setup_memory_end(void)
 478 {
 479         unsigned long memory_size;
 480         unsigned long max_mem;
 481         int i;
 482
 483 #ifdef CONFIG_ZFCPDUMP
 484         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 485                 memory_end = ZFCPDUMP_HSA_SIZE;
 486                 memory_end_set = 1;
 487         }
 488 #endif
 489         memory_size = 0;
 490         memory_end &= PAGE_MASK;
 491
 492         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 493         memory_end = min(max_mem, memory_end);
 494
 495         /*
 496          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 497          * extra checks that HOLES_IN_ZONE would require.
 498          */
 499         for (i = 0; i < MEMORY_CHUNKS; i++) {
 500                 unsigned long start, end;
 501                 struct mem_chunk *chunk;
 502                 unsigned long align;
 503
 504                 chunk = &memory_chunk[i];
 505                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 506                 start = (chunk->addr + align - 1) & ~(align - 1);
 507                 end = (chunk->addr + chunk->size) & ~(align - 1);
 508                 if (start >= end)
 509                         memset(chunk, 0, sizeof(*chunk));
 510                 else {
 511                         chunk->addr = start;
 512                         chunk->size = end - start;
 513                 }
 514         }
 515
 516         for (i = 0; i < MEMORY_CHUNKS; i++) {
 517                 struct mem_chunk *chunk = &memory_chunk[i];
 518
 519                 real_memory_size = max(real_memory_size,
 520                                        chunk->addr + chunk->size);
 521                 if (chunk->addr >= max_mem) {
 522                         memset(chunk, 0, sizeof(*chunk));
 523                         continue;
 524                 }
 525                 if (chunk->addr + chunk->size > max_mem)
 526                         chunk->size = max_mem - chunk->addr;
 527                 memory_size = max(memory_size, chunk->addr + chunk->size);
 528         }
 529         if (!memory_end)
 530                 memory_end = memory_size;
 531 }
 532
 533 static void __init
 534 setup_memory(void)
 535 {
 536         unsigned long bootmap_size;
 537         unsigned long start_pfn, end_pfn;
 538         int i;
 539
 540         /*
 541          * partially used pages are not usable - thus
 542          * we are rounding upwards:
 543          */
 544         start_pfn = PFN_UP(__pa(&_end));
 545         end_pfn = max_pfn = PFN_DOWN(memory_end);
 546
 547 #ifdef CONFIG_BLK_DEV_INITRD
 548         /*
 549          * Move the initrd in case the bitmap of the bootmem allocater
 550          * would overwrite it.
 551          */
 552
 553         if (INITRD_START && INITRD_SIZE) {
 554                 unsigned long bmap_size;
 555                 unsigned long start;
 556
 557                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 558                 bmap_size = PFN_PHYS(bmap_size);
 559
 560                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 561                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 562
 563                         if (start + INITRD_SIZE > memory_end) {
 564                                 pr_err("initrd extends beyond end of "
 565                                        "memory (0x%08lx > 0x%08lx) "
 566                                        "disabling initrd\n",
 567                                        start + INITRD_SIZE, memory_end);
 568                                 INITRD_START = INITRD_SIZE = 0;
 569                         } else {
 570                                 pr_info("Moving initrd (0x%08lx -> "
 571                                         "0x%08lx, size: %ld)\n",
 572                                         INITRD_START, start, INITRD_SIZE);
 573                                 memmove((void *) start, (void *) INITRD_START,
 574                                         INITRD_SIZE);
 575                                 INITRD_START = start;
 576                         }
 577                 }
 578         }
 579 #endif
 580
 581         /*
 582          * Initialize the boot-time allocator
 583          */
 584         bootmap_size = init_bootmem(start_pfn, end_pfn);
 585
 586         /*
 587          * Register RAM areas with the bootmem allocator.
 588          */
 589
 590         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 591                 unsigned long start_chunk, end_chunk, pfn;
 592
 593                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 594                         continue;
 595                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 596                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 597                 end_chunk = min(end_chunk, end_pfn);
 598                 if (start_chunk >= end_chunk)
 599                         continue;
 600                 add_active_range(0, start_chunk, end_chunk);
 601                 pfn = max(start_chunk, start_pfn);
 602                 for (; pfn < end_chunk; pfn++)
 603                         page_set_storage_key(PFN_PHYS(pfn),
 604                                              PAGE_DEFAULT_KEY, 0);
 605         }
 606
 607         psw_set_key(PAGE_DEFAULT_KEY);
 608
 609         free_bootmem_with_active_regions(0, max_pfn);
 610
 611         /*
 612          * Reserve memory used for lowcore/command line/kernel image.
 613          */
 614         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 615         reserve_bootmem((unsigned long)_stext,
 616                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 617                         BOOTMEM_DEFAULT);
 618         /*
 619          * Reserve the bootmem bitmap itself as well. We do this in two
 620          * steps (first step was init_bootmem()) because this catches
 621          * the (very unlikely) case of us accidentally initializing the
 622          * bootmem allocator with an invalid RAM area.
 623          */
 624         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 625                         BOOTMEM_DEFAULT);
 626
 627 #ifdef CONFIG_BLK_DEV_INITRD
 628         if (INITRD_START && INITRD_SIZE) {
 629                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 630                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 631                                         BOOTMEM_DEFAULT);
 632                         initrd_start = INITRD_START;
 633                         initrd_end = initrd_start + INITRD_SIZE;
 634                 } else {
 635                         pr_err("initrd extends beyond end of "
 636                                "memory (0x%08lx > 0x%08lx) "
 637                                "disabling initrd\n",
 638                                initrd_start + INITRD_SIZE, memory_end);
 639                         initrd_start = initrd_end = 0;
 640                 }
 641         }
 642 #endif
 643 }
 644
 645 /*
 646  * Setup hardware capabilities.
 647  */
 648 static void __init setup_hwcaps(void)
 649 {
 650         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 651         struct cpuid cpu_id;
 652         int i;
 653
 654         /*
 655          * The store facility list bits numbers as found in the principles
 656          * of operation are numbered with bit 1UL<<31 as number 0 to
 657          * bit 1UL<<0 as number 31.
 658          *   Bit 0: instructions named N3, "backported" to esa-mode
 659          *   Bit 2: z/Architecture mode is active
 660          *   Bit 7: the store-facility-list-extended facility is installed
 661          *   Bit 17: the message-security assist is installed
 662          *   Bit 19: the long-displacement facility is installed
 663          *   Bit 21: the extended-immediate facility is installed
 664          *   Bit 22: extended-translation facility 3 is installed
 665          *   Bit 30: extended-translation facility 3 enhancement facility
 666          * These get translated to:
 667          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 668          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 669          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 670          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 671          */
 672         for (i = 0; i < 6; i++)
 673                 if (test_facility(stfl_bits[i]))
 674                         elf_hwcap |= 1UL << i;
 675
 676         if (test_facility(22) && test_facility(30))
 677                 elf_hwcap |= HWCAP_S390_ETF3EH;
 678
 679         /*
 680          * Check for additional facilities with store-facility-list-extended.
 681          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 682          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 683          * as stored by stfl, bits 32-xxx contain additional facilities.
 684          * How many facility words are stored depends on the number of
 685          * doublewords passed to the instruction. The additional facilities
 686          * are:
 687          *   Bit 42: decimal floating point facility is installed
 688          *   Bit 44: perform floating point operation facility is installed
 689          * translated to:
 690          *   HWCAP_S390_DFP bit 6 (42 && 44).
 691          */
 692         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 693                 elf_hwcap |= HWCAP_S390_DFP;
 694
 695         /*
 696          * Huge page support HWCAP_S390_HPAGE is bit 7.
 697          */
 698         if (MACHINE_HAS_HPAGE)
 699                 elf_hwcap |= HWCAP_S390_HPAGE;
 700
 701         /*
 702          * 64-bit register support for 31-bit processes
 703          * HWCAP_S390_HIGH_GPRS is bit 9.
 704          */
 705         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 706
 707         get_cpu_id(&cpu_id);
 708         switch (cpu_id.machine) {
 709         case 0x9672:
 710 #if !defined(CONFIG_64BIT)
 711         default:        /* Use "g5" as default for 31 bit kernels. */
 712 #endif
 713                 strcpy(elf_platform, "g5");
 714                 break;
 715         case 0x2064:
 716         case 0x2066:
 717 #if defined(CONFIG_64BIT)
 718         default:        /* Use "z900" as default for 64 bit kernels. */
 719 #endif
 720                 strcpy(elf_platform, "z900");
 721                 break;
 722         case 0x2084:
 723         case 0x2086:
 724                 strcpy(elf_platform, "z990");
 725                 break;
 726         case 0x2094:
 727         case 0x2096:
 728                 strcpy(elf_platform, "z9-109");
 729                 break;
 730         case 0x2097:
 731         case 0x2098:
 732                 strcpy(elf_platform, "z10");
 733                 break;
 734         case 0x2817:
 735                 strcpy(elf_platform, "z196");
 736                 break;
 737         }
 738 }
 739
 740 /*
 741  * Setup function called from init/main.c just after the banner
 742  * was printed.
 743  */
 744
 745 void __init
 746 setup_arch(char **cmdline_p)
 747 {
 748         /*
 749          * print what head.S has found out about the machine
 750          */
 751 #ifndef CONFIG_64BIT
 752         if (MACHINE_IS_VM)
 753                 pr_info("Linux is running as a z/VM "
 754                         "guest operating system in 31-bit mode\n");
 755         else if (MACHINE_IS_LPAR)
 756                 pr_info("Linux is running natively in 31-bit mode\n");
 757         if (MACHINE_HAS_IEEE)
 758                 pr_info("The hardware system has IEEE compatible "
 759                         "floating point units\n");
 760         else
 761                 pr_info("The hardware system has no IEEE compatible "
 762                         "floating point units\n");
 763 #else /* CONFIG_64BIT */
 764         if (MACHINE_IS_VM)
 765                 pr_info("Linux is running as a z/VM "
 766                         "guest operating system in 64-bit mode\n");
 767         else if (MACHINE_IS_KVM)
 768                 pr_info("Linux is running under KVM in 64-bit mode\n");
 769         else if (MACHINE_IS_LPAR)
 770                 pr_info("Linux is running natively in 64-bit mode\n");
 771 #endif /* CONFIG_64BIT */
 772
 773         /* Have one command line that is parsed and saved in /proc/cmdline */
 774         /* boot_command_line has been already set up in early.c */
 775         *cmdline_p = boot_command_line;
 776
 777         ROOT_DEV = Root_RAM0;
 778
 779         init_mm.start_code = PAGE_OFFSET;
 780         init_mm.end_code = (unsigned long) &_etext;
 781         init_mm.end_data = (unsigned long) &_edata;
 782         init_mm.brk = (unsigned long) &_end;
 783
 784         if (MACHINE_HAS_MVCOS)
 785                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 786         else
 787                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 788
 789         parse_early_param();
 790
 791         setup_ipl();
 792         setup_memory_end();
 793         setup_addressing_mode();
 794         setup_memory();
 795         setup_resources();
 796         setup_lowcore();
 797
 798         cpu_init();
 799         s390_init_cpu_topology();
 800
 801         /*
 802          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 803          */
 804         setup_hwcaps();
 805
 806         /*
 807          * Create kernel page tables and switch to virtual addressing.
 808          */
 809         paging_init();
 810
 811         /* Setup default console */
 812         conmode_default();
 813         set_preferred_console();
 814
 815         /* Setup zfcpdump support */
 816         setup_zfcpdump(console_devno);
 817 }