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
  46 #include <asm/ipl.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/system.h>
  49 #include <asm/smp.h>
  50 #include <asm/mmu_context.h>
  51 #include <asm/cpcmd.h>
  52 #include <asm/lowcore.h>
  53 #include <asm/irq.h>
  54 #include <asm/page.h>
  55 #include <asm/ptrace.h>
  56 #include <asm/sections.h>
  57 #include <asm/ebcdic.h>
  58 #include <asm/compat.h>
  59 #include <asm/kvm_virtio.h>
  60
  61 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  62                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  63 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  64                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  65                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  66
  67 /*
  68  * User copy operations.
  69  */
  70 struct uaccess_ops uaccess;
  71 EXPORT_SYMBOL(uaccess);
  72
  73 /*
  74  * Machine setup..
  75  */
  76 unsigned int console_mode = 0;
  77 EXPORT_SYMBOL(console_mode);
  78
  79 unsigned int console_devno = -1;
  80 EXPORT_SYMBOL(console_devno);
  81
  82 unsigned int console_irq = -1;
  83 EXPORT_SYMBOL(console_irq);
  84
  85 unsigned long elf_hwcap = 0;
  86 char elf_platform[ELF_PLATFORM_SIZE];
  87
  88 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  89
  90 int __initdata memory_end_set;
  91 unsigned long __initdata memory_end;
  92
  93 /* An array with a pointer to the lowcore of every CPU. */
  94 struct _lowcore *lowcore_ptr[NR_CPUS];
  95 EXPORT_SYMBOL(lowcore_ptr);
  96
  97 /*
  98  * This is set up by the setup-routine at boot-time
  99  * for S390 need to find out, what we have to setup
 100  * using address 0x10400 ...
 101  */
 102
 103 #include <asm/setup.h>
 104
 105 /*
 106  * condev= and conmode= setup parameter.
 107  */
 108
 109 static int __init condev_setup(char *str)
 110 {
 111         int vdev;
 112
 113         vdev = simple_strtoul(str, &str, 0);
 114         if (vdev >= 0 && vdev < 65536) {
 115                 console_devno = vdev;
 116                 console_irq = -1;
 117         }
 118         return 1;
 119 }
 120
 121 __setup("condev=", condev_setup);
 122
 123 static void __init set_preferred_console(void)
 124 {
 125         if (MACHINE_IS_KVM)
 126                 add_preferred_console("hvc", 0, NULL);
 127         else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 128                 add_preferred_console("ttyS", 0, NULL);
 129         else if (CONSOLE_IS_3270)
 130                 add_preferred_console("tty3270", 0, NULL);
 131 }
 132
 133 static int __init conmode_setup(char *str)
 134 {
 135 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 136         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 137                 SET_CONSOLE_SCLP;
 138 #endif
 139 #if defined(CONFIG_TN3215_CONSOLE)
 140         if (strncmp(str, "3215", 5) == 0)
 141                 SET_CONSOLE_3215;
 142 #endif
 143 #if defined(CONFIG_TN3270_CONSOLE)
 144         if (strncmp(str, "3270", 5) == 0)
 145                 SET_CONSOLE_3270;
 146 #endif
 147         set_preferred_console();
 148         return 1;
 149 }
 150
 151 __setup("conmode=", conmode_setup);
 152
 153 static void __init conmode_default(void)
 154 {
 155         char query_buffer[1024];
 156         char *ptr;
 157
 158         if (MACHINE_IS_VM) {
 159                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 160                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 161                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 162                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 163                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 164                 ptr = strstr(query_buffer, "CONMODE");
 165                 /*
 166                  * Set the conmode to 3215 so that the device recognition
 167                  * will set the cu_type of the console to 3215. If the
 168                  * conmode is 3270 and we don't set it back then both
 169                  * 3215 and the 3270 driver will try to access the console
 170                  * device (3215 as console and 3270 as normal tty).
 171                  */
 172                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 173                 if (ptr == NULL) {
 174 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 175                         SET_CONSOLE_SCLP;
 176 #endif
 177                         return;
 178                 }
 179                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 180 #if defined(CONFIG_TN3270_CONSOLE)
 181                         SET_CONSOLE_3270;
 182 #elif defined(CONFIG_TN3215_CONSOLE)
 183                         SET_CONSOLE_3215;
 184 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 185                         SET_CONSOLE_SCLP;
 186 #endif
 187                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 188 #if defined(CONFIG_TN3215_CONSOLE)
 189                         SET_CONSOLE_3215;
 190 #elif defined(CONFIG_TN3270_CONSOLE)
 191                         SET_CONSOLE_3270;
 192 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 193                         SET_CONSOLE_SCLP;
 194 #endif
 195                 }
 196         } else {
 197 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 198                 SET_CONSOLE_SCLP;
 199 #endif
 200         }
 201 }
 202
 203 #ifdef CONFIG_ZFCPDUMP
 204 static void __init setup_zfcpdump(unsigned int console_devno)
 205 {
 206         static char str[41];
 207
 208         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 209                 return;
 210         if (console_devno != -1)
 211                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 212                         ipl_info.data.fcp.dev_id.devno, console_devno);
 213         else
 214                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 215                         ipl_info.data.fcp.dev_id.devno);
 216         strcat(boot_command_line, str);
 217         console_loglevel = 2;
 218 }
 219 #else
 220 static inline void setup_zfcpdump(unsigned int console_devno) {}
 221 #endif /* CONFIG_ZFCPDUMP */
 222
 223  /*
 224  * Reboot, halt and power_off stubs. They just call _machine_restart,
 225  * _machine_halt or _machine_power_off.
 226  */
 227
 228 void machine_restart(char *command)
 229 {
 230         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 231                 /*
 232                  * Only unblank the console if we are called in enabled
 233                  * context or a bust_spinlocks cleared the way for us.
 234                  */
 235                 console_unblank();
 236         _machine_restart(command);
 237 }
 238
 239 void machine_halt(void)
 240 {
 241         if (!in_interrupt() || oops_in_progress)
 242                 /*
 243                  * Only unblank the console if we are called in enabled
 244                  * context or a bust_spinlocks cleared the way for us.
 245                  */
 246                 console_unblank();
 247         _machine_halt();
 248 }
 249
 250 void machine_power_off(void)
 251 {
 252         if (!in_interrupt() || oops_in_progress)
 253                 /*
 254                  * Only unblank the console if we are called in enabled
 255                  * context or a bust_spinlocks cleared the way for us.
 256                  */
 257                 console_unblank();
 258         _machine_power_off();
 259 }
 260
 261 /*
 262  * Dummy power off function.
 263  */
 264 void (*pm_power_off)(void) = machine_power_off;
 265
 266 static int __init early_parse_mem(char *p)
 267 {
 268         memory_end = memparse(p, &p);
 269         memory_end_set = 1;
 270         return 0;
 271 }
 272 early_param("mem", early_parse_mem);
 273
 274 unsigned int user_mode = HOME_SPACE_MODE;
 275 EXPORT_SYMBOL_GPL(user_mode);
 276
 277 static int set_amode_and_uaccess(unsigned long user_amode,
 278                                  unsigned long user32_amode)
 279 {
 280         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 281                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 282                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 283 #ifdef CONFIG_COMPAT
 284         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 285                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 286                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 287         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 288                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 289                           PSW32_MASK_PSTATE;
 290 #endif
 291         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 292                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 293
 294         if (MACHINE_HAS_MVCOS) {
 295                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 296                 return 1;
 297         } else {
 298                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 299                 return 0;
 300         }
 301 }
 302
 303 /*
 304  * Switch kernel/user addressing modes?
 305  */
 306 static int __init early_parse_switch_amode(char *p)
 307 {
 308         if (user_mode != SECONDARY_SPACE_MODE)
 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 #ifdef CONFIG_S390_EXEC_PROTECT
 319         else if (p && strcmp(p, "secondary") == 0)
 320                 user_mode = SECONDARY_SPACE_MODE;
 321 #endif
 322         else if (!p || strcmp(p, "home") == 0)
 323                 user_mode = HOME_SPACE_MODE;
 324         else
 325                 return 1;
 326         return 0;
 327 }
 328 early_param("user_mode", early_parse_user_mode);
 329
 330 #ifdef CONFIG_S390_EXEC_PROTECT
 331 /*
 332  * Enable execute protection?
 333  */
 334 static int __init early_parse_noexec(char *p)
 335 {
 336         if (!strncmp(p, "off", 3))
 337                 return 0;
 338         user_mode = SECONDARY_SPACE_MODE;
 339         return 0;
 340 }
 341 early_param("noexec", early_parse_noexec);
 342 #endif /* CONFIG_S390_EXEC_PROTECT */
 343
 344 static void setup_addressing_mode(void)
 345 {
 346         if (user_mode == SECONDARY_SPACE_MODE) {
 347                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 348                                           PSW32_ASC_SECONDARY))
 349                         pr_info("Execute protection active, "
 350                                 "mvcos available\n");
 351                 else
 352                         pr_info("Execute protection active, "
 353                                 "mvcos not available\n");
 354         } else if (user_mode == PRIMARY_SPACE_MODE) {
 355                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 356                         pr_info("Address spaces switched, "
 357                                 "mvcos available\n");
 358                 else
 359                         pr_info("Address spaces switched, "
 360                                 "mvcos not available\n");
 361         }
 362 }
 363
 364 static void __init
 365 setup_lowcore(void)
 366 {
 367         struct _lowcore *lc;
 368
 369         /*
 370          * Setup lowcore for boot cpu
 371          */
 372         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 373         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 374         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 375         lc->restart_psw.addr =
 376                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 377         if (user_mode != HOME_SPACE_MODE)
 378                 lc->restart_psw.mask |= PSW_ASC_HOME;
 379         lc->external_new_psw.mask = psw_kernel_bits;
 380         lc->external_new_psw.addr =
 381                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 382         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 383         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 384         lc->program_new_psw.mask = psw_kernel_bits;
 385         lc->program_new_psw.addr =
 386                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 387         lc->mcck_new_psw.mask =
 388                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 389         lc->mcck_new_psw.addr =
 390                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 391         lc->io_new_psw.mask = psw_kernel_bits;
 392         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 393         lc->clock_comparator = -1ULL;
 394         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 395         lc->async_stack = (unsigned long)
 396                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 397         lc->panic_stack = (unsigned long)
 398                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 399         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 400         lc->thread_info = (unsigned long) &init_thread_union;
 401         lc->machine_flags = S390_lowcore.machine_flags;
 402         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 403         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 404                MAX_FACILITY_BIT/8);
 405 #ifndef CONFIG_64BIT
 406         if (MACHINE_HAS_IEEE) {
 407                 lc->extended_save_area_addr = (__u32)
 408                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 409                 /* enable extended save area */
 410                 __ctl_set_bit(14, 29);
 411         }
 412 #else
 413         lc->cmf_hpp = -1ULL;
 414         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 415 #endif
 416         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 417         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 418         lc->exit_timer = S390_lowcore.exit_timer;
 419         lc->user_timer = S390_lowcore.user_timer;
 420         lc->system_timer = S390_lowcore.system_timer;
 421         lc->steal_timer = S390_lowcore.steal_timer;
 422         lc->last_update_timer = S390_lowcore.last_update_timer;
 423         lc->last_update_clock = S390_lowcore.last_update_clock;
 424         lc->ftrace_func = S390_lowcore.ftrace_func;
 425         set_prefix((u32)(unsigned long) lc);
 426         lowcore_ptr[0] = lc;
 427 }
 428
 429 static struct resource code_resource = {
 430         .name  = "Kernel code",
 431         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 432 };
 433
 434 static struct resource data_resource = {
 435         .name = "Kernel data",
 436         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 437 };
 438
 439 static struct resource __initdata *standard_resources[] = {
 440         &code_resource,
 441         &data_resource,
 442 };
 443
 444 static void __init setup_resources(void)
 445 {
 446         struct resource *res, *std_res, *sub_res;
 447         int i, j;
 448
 449         code_resource.start = (unsigned long) &_text;
 450         code_resource.end = (unsigned long) &_etext - 1;
 451         data_resource.start = (unsigned long) &_etext;
 452         data_resource.end = (unsigned long) &_edata - 1;
 453
 454         for (i = 0; i < MEMORY_CHUNKS; i++) {
 455                 if (!memory_chunk[i].size)
 456                         continue;
 457                 res = alloc_bootmem_low(sizeof(*res));
 458                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 459                 switch (memory_chunk[i].type) {
 460                 case CHUNK_READ_WRITE:
 461                         res->name = "System RAM";
 462                         break;
 463                 case CHUNK_READ_ONLY:
 464                         res->name = "System ROM";
 465                         res->flags |= IORESOURCE_READONLY;
 466                         break;
 467                 default:
 468                         res->name = "reserved";
 469                 }
 470                 res->start = memory_chunk[i].addr;
 471                 res->end = res->start + memory_chunk[i].size - 1;
 472                 request_resource(&iomem_resource, res);
 473
 474                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 475                         std_res = standard_resources[j];
 476                         if (std_res->start < res->start ||
 477                             std_res->start > res->end)
 478                                 continue;
 479                         if (std_res->end > res->end) {
 480                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 481                                 *sub_res = *std_res;
 482                                 sub_res->end = res->end;
 483                                 std_res->start = res->end + 1;
 484                                 request_resource(res, sub_res);
 485                         } else {
 486                                 request_resource(res, std_res);
 487                         }
 488                 }
 489         }
 490 }
 491
 492 unsigned long real_memory_size;
 493 EXPORT_SYMBOL_GPL(real_memory_size);
 494
 495 static void __init setup_memory_end(void)
 496 {
 497         unsigned long memory_size;
 498         unsigned long max_mem;
 499         int i;
 500
 501 #ifdef CONFIG_ZFCPDUMP
 502         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 503                 memory_end = ZFCPDUMP_HSA_SIZE;
 504                 memory_end_set = 1;
 505         }
 506 #endif
 507         memory_size = 0;
 508         memory_end &= PAGE_MASK;
 509
 510         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 511         memory_end = min(max_mem, memory_end);
 512
 513         /*
 514          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 515          * extra checks that HOLES_IN_ZONE would require.
 516          */
 517         for (i = 0; i < MEMORY_CHUNKS; i++) {
 518                 unsigned long start, end;
 519                 struct mem_chunk *chunk;
 520                 unsigned long align;
 521
 522                 chunk = &memory_chunk[i];
 523                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 524                 start = (chunk->addr + align - 1) & ~(align - 1);
 525                 end = (chunk->addr + chunk->size) & ~(align - 1);
 526                 if (start >= end)
 527                         memset(chunk, 0, sizeof(*chunk));
 528                 else {
 529                         chunk->addr = start;
 530                         chunk->size = end - start;
 531                 }
 532         }
 533
 534         for (i = 0; i < MEMORY_CHUNKS; i++) {
 535                 struct mem_chunk *chunk = &memory_chunk[i];
 536
 537                 real_memory_size = max(real_memory_size,
 538                                        chunk->addr + chunk->size);
 539                 if (chunk->addr >= max_mem) {
 540                         memset(chunk, 0, sizeof(*chunk));
 541                         continue;
 542                 }
 543                 if (chunk->addr + chunk->size > max_mem)
 544                         chunk->size = max_mem - chunk->addr;
 545                 memory_size = max(memory_size, chunk->addr + chunk->size);
 546         }
 547         if (!memory_end)
 548                 memory_end = memory_size;
 549 }
 550
 551 static void __init
 552 setup_memory(void)
 553 {
 554         unsigned long bootmap_size;
 555         unsigned long start_pfn, end_pfn;
 556         int i;
 557
 558         /*
 559          * partially used pages are not usable - thus
 560          * we are rounding upwards:
 561          */
 562         start_pfn = PFN_UP(__pa(&_end));
 563         end_pfn = max_pfn = PFN_DOWN(memory_end);
 564
 565 #ifdef CONFIG_BLK_DEV_INITRD
 566         /*
 567          * Move the initrd in case the bitmap of the bootmem allocater
 568          * would overwrite it.
 569          */
 570
 571         if (INITRD_START && INITRD_SIZE) {
 572                 unsigned long bmap_size;
 573                 unsigned long start;
 574
 575                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 576                 bmap_size = PFN_PHYS(bmap_size);
 577
 578                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 579                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 580
 581                         if (start + INITRD_SIZE > memory_end) {
 582                                 pr_err("initrd extends beyond end of "
 583                                        "memory (0x%08lx > 0x%08lx) "
 584                                        "disabling initrd\n",
 585                                        start + INITRD_SIZE, memory_end);
 586                                 INITRD_START = INITRD_SIZE = 0;
 587                         } else {
 588                                 pr_info("Moving initrd (0x%08lx -> "
 589                                         "0x%08lx, size: %ld)\n",
 590                                         INITRD_START, start, INITRD_SIZE);
 591                                 memmove((void *) start, (void *) INITRD_START,
 592                                         INITRD_SIZE);
 593                                 INITRD_START = start;
 594                         }
 595                 }
 596         }
 597 #endif
 598
 599         /*
 600          * Initialize the boot-time allocator
 601          */
 602         bootmap_size = init_bootmem(start_pfn, end_pfn);
 603
 604         /*
 605          * Register RAM areas with the bootmem allocator.
 606          */
 607
 608         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 609                 unsigned long start_chunk, end_chunk, pfn;
 610
 611                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 612                         continue;
 613                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 614                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 615                 end_chunk = min(end_chunk, end_pfn);
 616                 if (start_chunk >= end_chunk)
 617                         continue;
 618                 add_active_range(0, start_chunk, end_chunk);
 619                 pfn = max(start_chunk, start_pfn);
 620                 for (; pfn < end_chunk; pfn++)
 621                         page_set_storage_key(PFN_PHYS(pfn),
 622                                              PAGE_DEFAULT_KEY, 0);
 623         }
 624
 625         psw_set_key(PAGE_DEFAULT_KEY);
 626
 627         free_bootmem_with_active_regions(0, max_pfn);
 628
 629         /*
 630          * Reserve memory used for lowcore/command line/kernel image.
 631          */
 632         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 633         reserve_bootmem((unsigned long)_stext,
 634                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 635                         BOOTMEM_DEFAULT);
 636         /*
 637          * Reserve the bootmem bitmap itself as well. We do this in two
 638          * steps (first step was init_bootmem()) because this catches
 639          * the (very unlikely) case of us accidentally initializing the
 640          * bootmem allocator with an invalid RAM area.
 641          */
 642         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 643                         BOOTMEM_DEFAULT);
 644
 645 #ifdef CONFIG_BLK_DEV_INITRD
 646         if (INITRD_START && INITRD_SIZE) {
 647                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 648                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 649                                         BOOTMEM_DEFAULT);
 650                         initrd_start = INITRD_START;
 651                         initrd_end = initrd_start + INITRD_SIZE;
 652                 } else {
 653                         pr_err("initrd extends beyond end of "
 654                                "memory (0x%08lx > 0x%08lx) "
 655                                "disabling initrd\n",
 656                                initrd_start + INITRD_SIZE, memory_end);
 657                         initrd_start = initrd_end = 0;
 658                 }
 659         }
 660 #endif
 661 }
 662
 663 /*
 664  * Setup hardware capabilities.
 665  */
 666 static void __init setup_hwcaps(void)
 667 {
 668         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 669         struct cpuid cpu_id;
 670         int i;
 671
 672         /*
 673          * The store facility list bits numbers as found in the principles
 674          * of operation are numbered with bit 1UL<<31 as number 0 to
 675          * bit 1UL<<0 as number 31.
 676          *   Bit 0: instructions named N3, "backported" to esa-mode
 677          *   Bit 2: z/Architecture mode is active
 678          *   Bit 7: the store-facility-list-extended facility is installed
 679          *   Bit 17: the message-security assist is installed
 680          *   Bit 19: the long-displacement facility is installed
 681          *   Bit 21: the extended-immediate facility is installed
 682          *   Bit 22: extended-translation facility 3 is installed
 683          *   Bit 30: extended-translation facility 3 enhancement facility
 684          * These get translated to:
 685          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 686          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 687          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 688          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 689          */
 690         for (i = 0; i < 6; i++)
 691                 if (test_facility(stfl_bits[i]))
 692                         elf_hwcap |= 1UL << i;
 693
 694         if (test_facility(22) && test_facility(30))
 695                 elf_hwcap |= HWCAP_S390_ETF3EH;
 696
 697         /*
 698          * Check for additional facilities with store-facility-list-extended.
 699          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 700          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 701          * as stored by stfl, bits 32-xxx contain additional facilities.
 702          * How many facility words are stored depends on the number of
 703          * doublewords passed to the instruction. The additional facilites
 704          * are:
 705          *   Bit 42: decimal floating point facility is installed
 706          *   Bit 44: perform floating point operation facility is installed
 707          * translated to:
 708          *   HWCAP_S390_DFP bit 6 (42 && 44).
 709          */
 710         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 711                 elf_hwcap |= HWCAP_S390_DFP;
 712
 713         /*
 714          * Huge page support HWCAP_S390_HPAGE is bit 7.
 715          */
 716         if (MACHINE_HAS_HPAGE)
 717                 elf_hwcap |= HWCAP_S390_HPAGE;
 718
 719         /*
 720          * 64-bit register support for 31-bit processes
 721          * HWCAP_S390_HIGH_GPRS is bit 9.
 722          */
 723         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 724
 725         get_cpu_id(&cpu_id);
 726         switch (cpu_id.machine) {
 727         case 0x9672:
 728 #if !defined(CONFIG_64BIT)
 729         default:        /* Use "g5" as default for 31 bit kernels. */
 730 #endif
 731                 strcpy(elf_platform, "g5");
 732                 break;
 733         case 0x2064:
 734         case 0x2066:
 735 #if defined(CONFIG_64BIT)
 736         default:        /* Use "z900" as default for 64 bit kernels. */
 737 #endif
 738                 strcpy(elf_platform, "z900");
 739                 break;
 740         case 0x2084:
 741         case 0x2086:
 742                 strcpy(elf_platform, "z990");
 743                 break;
 744         case 0x2094:
 745         case 0x2096:
 746                 strcpy(elf_platform, "z9-109");
 747                 break;
 748         case 0x2097:
 749         case 0x2098:
 750                 strcpy(elf_platform, "z10");
 751                 break;
 752         case 0x2817:
 753                 strcpy(elf_platform, "z196");
 754                 break;
 755         }
 756 }
 757
 758 /*
 759  * Setup function called from init/main.c just after the banner
 760  * was printed.
 761  */
 762
 763 void __init
 764 setup_arch(char **cmdline_p)
 765 {
 766         /*
 767          * print what head.S has found out about the machine
 768          */
 769 #ifndef CONFIG_64BIT
 770         if (MACHINE_IS_VM)
 771                 pr_info("Linux is running as a z/VM "
 772                         "guest operating system in 31-bit mode\n");
 773         else if (MACHINE_IS_LPAR)
 774                 pr_info("Linux is running natively in 31-bit mode\n");
 775         if (MACHINE_HAS_IEEE)
 776                 pr_info("The hardware system has IEEE compatible "
 777                         "floating point units\n");
 778         else
 779                 pr_info("The hardware system has no IEEE compatible "
 780                         "floating point units\n");
 781 #else /* CONFIG_64BIT */
 782         if (MACHINE_IS_VM)
 783                 pr_info("Linux is running as a z/VM "
 784                         "guest operating system in 64-bit mode\n");
 785         else if (MACHINE_IS_KVM)
 786                 pr_info("Linux is running under KVM in 64-bit mode\n");
 787         else if (MACHINE_IS_LPAR)
 788                 pr_info("Linux is running natively in 64-bit mode\n");
 789 #endif /* CONFIG_64BIT */
 790
 791         /* Have one command line that is parsed and saved in /proc/cmdline */
 792         /* boot_command_line has been already set up in early.c */
 793         *cmdline_p = boot_command_line;
 794
 795         ROOT_DEV = Root_RAM0;
 796
 797         init_mm.start_code = PAGE_OFFSET;
 798         init_mm.end_code = (unsigned long) &_etext;
 799         init_mm.end_data = (unsigned long) &_edata;
 800         init_mm.brk = (unsigned long) &_end;
 801
 802         if (MACHINE_HAS_MVCOS)
 803                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 804         else
 805                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 806
 807         parse_early_param();
 808
 809         setup_ipl();
 810         setup_memory_end();
 811         setup_addressing_mode();
 812         setup_memory();
 813         setup_resources();
 814         setup_lowcore();
 815
 816         cpu_init();
 817         s390_init_cpu_topology();
 818
 819         /*
 820          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 821          */
 822         setup_hwcaps();
 823
 824         /*
 825          * Create kernel page tables and switch to virtual addressing.
 826          */
 827         paging_init();
 828
 829         /* Setup default console */
 830         conmode_default();
 831         set_preferred_console();
 832
 833         /* Setup zfcpdump support */
 834         setup_zfcpdump(console_devno);
 835 }