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 #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/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/tty.h>
  31 #include <linux/ioport.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/initrd.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/console.h>
  38 #include <linux/kernel_stat.h>
  39 #include <linux/device.h>
  40 #include <linux/notifier.h>
  41 #include <linux/pfn.h>
  42 #include <linux/ctype.h>
  43 #include <linux/reboot.h>
  44 #include <linux/topology.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 unsigned int console_devno = -1;
  78 unsigned int console_irq = -1;
  79 unsigned long machine_flags;
  80 unsigned long elf_hwcap = 0;
  81 char elf_platform[ELF_PLATFORM_SIZE];
  82
  83 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  84 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  85 static unsigned long __initdata memory_end;
  86
  87 /*
  88  * This is set up by the setup-routine at boot-time
  89  * for S390 need to find out, what we have to setup
  90  * using address 0x10400 ...
  91  */
  92
  93 #include <asm/setup.h>
  94
  95 static struct resource code_resource = {
  96         .name  = "Kernel code",
  97         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  98 };
  99
 100 static struct resource data_resource = {
 101         .name = "Kernel data",
 102         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 103 };
 104
 105 /*
 106  * cpu_init() initializes state that is per-CPU.
 107  */
 108 void __cpuinit cpu_init(void)
 109 {
 110         int addr = hard_smp_processor_id();
 111
 112         /*
 113          * Store processor id in lowcore (used e.g. in timer_interrupt)
 114          */
 115         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 116         S390_lowcore.cpu_data.cpu_addr = addr;
 117
 118         /*
 119          * Force FPU initialization:
 120          */
 121         clear_thread_flag(TIF_USEDFPU);
 122         clear_used_math();
 123
 124         atomic_inc(&init_mm.mm_count);
 125         current->active_mm = &init_mm;
 126         if (current->mm)
 127                 BUG();
 128         enter_lazy_tlb(&init_mm, current);
 129 }
 130
 131 /*
 132  * condev= and conmode= setup parameter.
 133  */
 134
 135 static int __init condev_setup(char *str)
 136 {
 137         int vdev;
 138
 139         vdev = simple_strtoul(str, &str, 0);
 140         if (vdev >= 0 && vdev < 65536) {
 141                 console_devno = vdev;
 142                 console_irq = -1;
 143         }
 144         return 1;
 145 }
 146
 147 __setup("condev=", condev_setup);
 148
 149 static int __init conmode_setup(char *str)
 150 {
 151 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 152         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 153                 SET_CONSOLE_SCLP;
 154 #endif
 155 #if defined(CONFIG_TN3215_CONSOLE)
 156         if (strncmp(str, "3215", 5) == 0)
 157                 SET_CONSOLE_3215;
 158 #endif
 159 #if defined(CONFIG_TN3270_CONSOLE)
 160         if (strncmp(str, "3270", 5) == 0)
 161                 SET_CONSOLE_3270;
 162 #endif
 163         return 1;
 164 }
 165
 166 __setup("conmode=", conmode_setup);
 167
 168 static void __init conmode_default(void)
 169 {
 170         char query_buffer[1024];
 171         char *ptr;
 172
 173         if (MACHINE_IS_VM) {
 174                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 175                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 176                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 177                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 178                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 179                 ptr = strstr(query_buffer, "CONMODE");
 180                 /*
 181                  * Set the conmode to 3215 so that the device recognition
 182                  * will set the cu_type of the console to 3215. If the
 183                  * conmode is 3270 and we don't set it back then both
 184                  * 3215 and the 3270 driver will try to access the console
 185                  * device (3215 as console and 3270 as normal tty).
 186                  */
 187                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 188                 if (ptr == NULL) {
 189 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 190                         SET_CONSOLE_SCLP;
 191 #endif
 192                         return;
 193                 }
 194                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 195 #if defined(CONFIG_TN3270_CONSOLE)
 196                         SET_CONSOLE_3270;
 197 #elif defined(CONFIG_TN3215_CONSOLE)
 198                         SET_CONSOLE_3215;
 199 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 200                         SET_CONSOLE_SCLP;
 201 #endif
 202                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 203 #if defined(CONFIG_TN3215_CONSOLE)
 204                         SET_CONSOLE_3215;
 205 #elif defined(CONFIG_TN3270_CONSOLE)
 206                         SET_CONSOLE_3270;
 207 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 208                         SET_CONSOLE_SCLP;
 209 #endif
 210                 }
 211         } else {
 212 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 213                 SET_CONSOLE_SCLP;
 214 #endif
 215         }
 216 }
 217
 218 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 219 static void __init setup_zfcpdump(unsigned int console_devno)
 220 {
 221         static char str[41];
 222
 223         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 224                 return;
 225         if (console_devno != -1)
 226                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 227                         ipl_info.data.fcp.dev_id.devno, console_devno);
 228         else
 229                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 230                         ipl_info.data.fcp.dev_id.devno);
 231         strcat(boot_command_line, str);
 232         console_loglevel = 2;
 233 }
 234 #else
 235 static inline void setup_zfcpdump(unsigned int console_devno) {}
 236 #endif /* CONFIG_ZFCPDUMP */
 237
 238  /*
 239  * Reboot, halt and power_off stubs. They just call _machine_restart,
 240  * _machine_halt or _machine_power_off.
 241  */
 242
 243 void machine_restart(char *command)
 244 {
 245         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 246                 /*
 247                  * Only unblank the console if we are called in enabled
 248                  * context or a bust_spinlocks cleared the way for us.
 249                  */
 250                 console_unblank();
 251         _machine_restart(command);
 252 }
 253
 254 void machine_halt(void)
 255 {
 256         if (!in_interrupt() || oops_in_progress)
 257                 /*
 258                  * Only unblank the console if we are called in enabled
 259                  * context or a bust_spinlocks cleared the way for us.
 260                  */
 261                 console_unblank();
 262         _machine_halt();
 263 }
 264
 265 void machine_power_off(void)
 266 {
 267         if (!in_interrupt() || oops_in_progress)
 268                 /*
 269                  * Only unblank the console if we are called in enabled
 270                  * context or a bust_spinlocks cleared the way for us.
 271                  */
 272                 console_unblank();
 273         _machine_power_off();
 274 }
 275
 276 /*
 277  * Dummy power off function.
 278  */
 279 void (*pm_power_off)(void) = machine_power_off;
 280
 281 static int __init early_parse_mem(char *p)
 282 {
 283         memory_end = memparse(p, &p);
 284         return 0;
 285 }
 286 early_param("mem", early_parse_mem);
 287
 288 #ifdef CONFIG_S390_SWITCH_AMODE
 289 #ifdef CONFIG_PGSTE
 290 unsigned int switch_amode = 1;
 291 #else
 292 unsigned int switch_amode = 0;
 293 #endif
 294 EXPORT_SYMBOL_GPL(switch_amode);
 295
 296 static int set_amode_and_uaccess(unsigned long user_amode,
 297                                  unsigned long user32_amode)
 298 {
 299         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 300                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 301                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 302 #ifdef CONFIG_COMPAT
 303         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 304                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 305                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 306         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 307                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 308                           PSW32_MASK_PSTATE;
 309 #endif
 310         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 311                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 312
 313         if (MACHINE_HAS_MVCOS) {
 314                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 315                 return 1;
 316         } else {
 317                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 318                 return 0;
 319         }
 320 }
 321
 322 /*
 323  * Switch kernel/user addressing modes?
 324  */
 325 static int __init early_parse_switch_amode(char *p)
 326 {
 327         switch_amode = 1;
 328         return 0;
 329 }
 330 early_param("switch_amode", early_parse_switch_amode);
 331
 332 #else /* CONFIG_S390_SWITCH_AMODE */
 333 static inline int set_amode_and_uaccess(unsigned long user_amode,
 334                                         unsigned long user32_amode)
 335 {
 336         return 0;
 337 }
 338 #endif /* CONFIG_S390_SWITCH_AMODE */
 339
 340 #ifdef CONFIG_S390_EXEC_PROTECT
 341 unsigned int s390_noexec = 0;
 342 EXPORT_SYMBOL_GPL(s390_noexec);
 343
 344 /*
 345  * Enable execute protection?
 346  */
 347 static int __init early_parse_noexec(char *p)
 348 {
 349         if (!strncmp(p, "off", 3))
 350                 return 0;
 351         switch_amode = 1;
 352         s390_noexec = 1;
 353         return 0;
 354 }
 355 early_param("noexec", early_parse_noexec);
 356 #endif /* CONFIG_S390_EXEC_PROTECT */
 357
 358 static void setup_addressing_mode(void)
 359 {
 360         if (s390_noexec) {
 361                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 362                                           PSW32_ASC_SECONDARY))
 363                         pr_info("Execute protection active, "
 364                                 "mvcos available\n");
 365                 else
 366                         pr_info("Execute protection active, "
 367                                 "mvcos not available\n");
 368         } else if (switch_amode) {
 369                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 370                         pr_info("Address spaces switched, "
 371                                 "mvcos available\n");
 372                 else
 373                         pr_info("Address spaces switched, "
 374                                 "mvcos not available\n");
 375         }
 376 #ifdef CONFIG_TRACE_IRQFLAGS
 377         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 378         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 379 #endif
 380 }
 381
 382 static void __init
 383 setup_lowcore(void)
 384 {
 385         struct _lowcore *lc;
 386         int lc_pages;
 387
 388         /*
 389          * Setup lowcore for boot cpu
 390          */
 391         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 392         lc = (struct _lowcore *)
 393                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 394         memset(lc, 0, lc_pages * PAGE_SIZE);
 395         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 396         lc->restart_psw.addr =
 397                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 398         if (switch_amode)
 399                 lc->restart_psw.mask |= PSW_ASC_HOME;
 400         lc->external_new_psw.mask = psw_kernel_bits;
 401         lc->external_new_psw.addr =
 402                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 403         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 404         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 405         lc->program_new_psw.mask = psw_kernel_bits;
 406         lc->program_new_psw.addr =
 407                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 408         lc->mcck_new_psw.mask =
 409                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 410         lc->mcck_new_psw.addr =
 411                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 412         lc->io_new_psw.mask = psw_kernel_bits;
 413         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 414         lc->ipl_device = S390_lowcore.ipl_device;
 415         lc->clock_comparator = -1ULL;
 416         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 417         lc->async_stack = (unsigned long)
 418                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 419         lc->panic_stack = (unsigned long)
 420                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 421         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 422         lc->thread_info = (unsigned long) &init_thread_union;
 423 #ifndef CONFIG_64BIT
 424         if (MACHINE_HAS_IEEE) {
 425                 lc->extended_save_area_addr = (__u32)
 426                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 427                 /* enable extended save area */
 428                 __ctl_set_bit(14, 29);
 429         }
 430 #else
 431         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 432 #endif
 433         set_prefix((u32)(unsigned long) lc);
 434 }
 435
 436 static void __init
 437 setup_resources(void)
 438 {
 439         struct resource *res, *sub_res;
 440         int i;
 441
 442         code_resource.start = (unsigned long) &_text;
 443         code_resource.end = (unsigned long) &_etext - 1;
 444         data_resource.start = (unsigned long) &_etext;
 445         data_resource.end = (unsigned long) &_edata - 1;
 446
 447         for (i = 0; i < MEMORY_CHUNKS; i++) {
 448                 if (!memory_chunk[i].size)
 449                         continue;
 450                 res = alloc_bootmem_low(sizeof(struct resource));
 451                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 452                 switch (memory_chunk[i].type) {
 453                 case CHUNK_READ_WRITE:
 454                         res->name = "System RAM";
 455                         break;
 456                 case CHUNK_READ_ONLY:
 457                         res->name = "System ROM";
 458                         res->flags |= IORESOURCE_READONLY;
 459                         break;
 460                 default:
 461                         res->name = "reserved";
 462                 }
 463                 res->start = memory_chunk[i].addr;
 464                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 465                 request_resource(&iomem_resource, res);
 466
 467                 if (code_resource.start >= res->start  &&
 468                         code_resource.start <= res->end &&
 469                         code_resource.end > res->end) {
 470                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 471                         memcpy(sub_res, &code_resource,
 472                                 sizeof(struct resource));
 473                         sub_res->end = res->end;
 474                         code_resource.start = res->end + 1;
 475                         request_resource(res, sub_res);
 476                 }
 477
 478                 if (code_resource.start >= res->start &&
 479                         code_resource.start <= res->end &&
 480                         code_resource.end <= res->end)
 481                         request_resource(res, &code_resource);
 482
 483                 if (data_resource.start >= res->start &&
 484                         data_resource.start <= res->end &&
 485                         data_resource.end > res->end) {
 486                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 487                         memcpy(sub_res, &data_resource,
 488                                 sizeof(struct resource));
 489                         sub_res->end = res->end;
 490                         data_resource.start = res->end + 1;
 491                         request_resource(res, sub_res);
 492                 }
 493
 494                 if (data_resource.start >= res->start &&
 495                         data_resource.start <= res->end &&
 496                         data_resource.end <= res->end)
 497                         request_resource(res, &data_resource);
 498         }
 499 }
 500
 501 unsigned long real_memory_size;
 502 EXPORT_SYMBOL_GPL(real_memory_size);
 503
 504 static void __init setup_memory_end(void)
 505 {
 506         unsigned long memory_size;
 507         unsigned long max_mem;
 508         int i;
 509
 510 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 511         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 512                 memory_end = ZFCPDUMP_HSA_SIZE;
 513 #endif
 514         memory_size = 0;
 515         memory_end &= PAGE_MASK;
 516
 517         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 518         memory_end = min(max_mem, memory_end);
 519
 520         /*
 521          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 522          * extra checks that HOLES_IN_ZONE would require.
 523          */
 524         for (i = 0; i < MEMORY_CHUNKS; i++) {
 525                 unsigned long start, end;
 526                 struct mem_chunk *chunk;
 527                 unsigned long align;
 528
 529                 chunk = &memory_chunk[i];
 530                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 531                 start = (chunk->addr + align - 1) & ~(align - 1);
 532                 end = (chunk->addr + chunk->size) & ~(align - 1);
 533                 if (start >= end)
 534                         memset(chunk, 0, sizeof(*chunk));
 535                 else {
 536                         chunk->addr = start;
 537                         chunk->size = end - start;
 538                 }
 539         }
 540
 541         for (i = 0; i < MEMORY_CHUNKS; i++) {
 542                 struct mem_chunk *chunk = &memory_chunk[i];
 543
 544                 real_memory_size = max(real_memory_size,
 545                                        chunk->addr + chunk->size);
 546                 if (chunk->addr >= max_mem) {
 547                         memset(chunk, 0, sizeof(*chunk));
 548                         continue;
 549                 }
 550                 if (chunk->addr + chunk->size > max_mem)
 551                         chunk->size = max_mem - chunk->addr;
 552                 memory_size = max(memory_size, chunk->addr + chunk->size);
 553         }
 554         if (!memory_end)
 555                 memory_end = memory_size;
 556 }
 557
 558 static void __init
 559 setup_memory(void)
 560 {
 561         unsigned long bootmap_size;
 562         unsigned long start_pfn, end_pfn;
 563         int i;
 564
 565         /*
 566          * partially used pages are not usable - thus
 567          * we are rounding upwards:
 568          */
 569         start_pfn = PFN_UP(__pa(&_end));
 570         end_pfn = max_pfn = PFN_DOWN(memory_end);
 571
 572 #ifdef CONFIG_BLK_DEV_INITRD
 573         /*
 574          * Move the initrd in case the bitmap of the bootmem allocater
 575          * would overwrite it.
 576          */
 577
 578         if (INITRD_START && INITRD_SIZE) {
 579                 unsigned long bmap_size;
 580                 unsigned long start;
 581
 582                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 583                 bmap_size = PFN_PHYS(bmap_size);
 584
 585                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 586                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 587
 588                         if (start + INITRD_SIZE > memory_end) {
 589                                 pr_err("initrd extends beyond end of "
 590                                        "memory (0x%08lx > 0x%08lx) "
 591                                        "disabling initrd\n",
 592                                        start + INITRD_SIZE, memory_end);
 593                                 INITRD_START = INITRD_SIZE = 0;
 594                         } else {
 595                                 pr_info("Moving initrd (0x%08lx -> "
 596                                         "0x%08lx, size: %ld)\n",
 597                                         INITRD_START, start, INITRD_SIZE);
 598                                 memmove((void *) start, (void *) INITRD_START,
 599                                         INITRD_SIZE);
 600                                 INITRD_START = start;
 601                         }
 602                 }
 603         }
 604 #endif
 605
 606         /*
 607          * Initialize the boot-time allocator
 608          */
 609         bootmap_size = init_bootmem(start_pfn, end_pfn);
 610
 611         /*
 612          * Register RAM areas with the bootmem allocator.
 613          */
 614
 615         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 616                 unsigned long start_chunk, end_chunk, pfn;
 617
 618                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 619                         continue;
 620                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 621                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 622                 end_chunk = min(end_chunk, end_pfn);
 623                 if (start_chunk >= end_chunk)
 624                         continue;
 625                 add_active_range(0, start_chunk, end_chunk);
 626                 pfn = max(start_chunk, start_pfn);
 627                 for (; pfn < end_chunk; pfn++)
 628                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 629         }
 630
 631         psw_set_key(PAGE_DEFAULT_KEY);
 632
 633         free_bootmem_with_active_regions(0, max_pfn);
 634
 635         /*
 636          * Reserve memory used for lowcore/command line/kernel image.
 637          */
 638         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 639         reserve_bootmem((unsigned long)_stext,
 640                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 641                         BOOTMEM_DEFAULT);
 642         /*
 643          * Reserve the bootmem bitmap itself as well. We do this in two
 644          * steps (first step was init_bootmem()) because this catches
 645          * the (very unlikely) case of us accidentally initializing the
 646          * bootmem allocator with an invalid RAM area.
 647          */
 648         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 649                         BOOTMEM_DEFAULT);
 650
 651 #ifdef CONFIG_BLK_DEV_INITRD
 652         if (INITRD_START && INITRD_SIZE) {
 653                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 654                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 655                                         BOOTMEM_DEFAULT);
 656                         initrd_start = INITRD_START;
 657                         initrd_end = initrd_start + INITRD_SIZE;
 658                 } else {
 659                         pr_err("initrd extends beyond end of "
 660                                "memory (0x%08lx > 0x%08lx) "
 661                                "disabling initrd\n",
 662                                initrd_start + INITRD_SIZE, memory_end);
 663                         initrd_start = initrd_end = 0;
 664                 }
 665         }
 666 #endif
 667 }
 668
 669 /*
 670  * Setup hardware capabilities.
 671  */
 672 static void __init setup_hwcaps(void)
 673 {
 674         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 675         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 676         unsigned long long facility_list_extended;
 677         unsigned int facility_list;
 678         int i;
 679
 680         facility_list = stfl();
 681         /*
 682          * The store facility list bits numbers as found in the principles
 683          * of operation are numbered with bit 1UL<<31 as number 0 to
 684          * bit 1UL<<0 as number 31.
 685          *   Bit 0: instructions named N3, "backported" to esa-mode
 686          *   Bit 2: z/Architecture mode is active
 687          *   Bit 7: the store-facility-list-extended facility is installed
 688          *   Bit 17: the message-security assist is installed
 689          *   Bit 19: the long-displacement facility is installed
 690          *   Bit 21: the extended-immediate facility is installed
 691          * These get translated to:
 692          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 693          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 694          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 695          */
 696         for (i = 0; i < 6; i++)
 697                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 698                         elf_hwcap |= 1UL << i;
 699
 700         /*
 701          * Check for additional facilities with store-facility-list-extended.
 702          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 703          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 704          * as stored by stfl, bits 32-xxx contain additional facilities.
 705          * How many facility words are stored depends on the number of
 706          * doublewords passed to the instruction. The additional facilites
 707          * are:
 708          *   Bit 43: decimal floating point facility is installed
 709          * translated to:
 710          *   HWCAP_S390_DFP bit 6.
 711          */
 712         if ((elf_hwcap & (1UL << 2)) &&
 713             __stfle(&facility_list_extended, 1) > 0) {
 714                 if (facility_list_extended & (1ULL << (64 - 43)))
 715                         elf_hwcap |= 1UL << 6;
 716         }
 717
 718         if (MACHINE_HAS_HPAGE)
 719                 elf_hwcap |= 1UL << 7;
 720
 721         switch (cpuinfo->cpu_id.machine) {
 722         case 0x9672:
 723 #if !defined(CONFIG_64BIT)
 724         default:        /* Use "g5" as default for 31 bit kernels. */
 725 #endif
 726                 strcpy(elf_platform, "g5");
 727                 break;
 728         case 0x2064:
 729         case 0x2066:
 730 #if defined(CONFIG_64BIT)
 731         default:        /* Use "z900" as default for 64 bit kernels. */
 732 #endif
 733                 strcpy(elf_platform, "z900");
 734                 break;
 735         case 0x2084:
 736         case 0x2086:
 737                 strcpy(elf_platform, "z990");
 738                 break;
 739         case 0x2094:
 740         case 0x2096:
 741                 strcpy(elf_platform, "z9-109");
 742                 break;
 743         case 0x2097:
 744         case 0x2098:
 745                 strcpy(elf_platform, "z10");
 746                 break;
 747         }
 748 }
 749
 750 /*
 751  * Setup function called from init/main.c just after the banner
 752  * was printed.
 753  */
 754
 755 void __init
 756 setup_arch(char **cmdline_p)
 757 {
 758         /* set up preferred console */
 759         add_preferred_console("ttyS", 0, NULL);
 760
 761         /*
 762          * print what head.S has found out about the machine
 763          */
 764 #ifndef CONFIG_64BIT
 765         if (MACHINE_IS_VM)
 766                 pr_info("Linux is running as a z/VM "
 767                         "guest operating system in 31-bit mode\n");
 768         else
 769                 pr_info("Linux is running natively in 31-bit mode\n");
 770         if (MACHINE_HAS_IEEE)
 771                 pr_info("The hardware system has IEEE compatible "
 772                         "floating point units\n");
 773         else
 774                 pr_info("The hardware system has no IEEE compatible "
 775                         "floating point units\n");
 776 #else /* CONFIG_64BIT */
 777         if (MACHINE_IS_VM)
 778                 pr_info("Linux is running as a z/VM "
 779                         "guest operating system in 64-bit mode\n");
 780         else if (MACHINE_IS_KVM) {
 781                 pr_info("Linux is running under KVM in 64-bit mode\n");
 782                 add_preferred_console("hvc", 0, NULL);
 783                 s390_virtio_console_init();
 784         } else
 785                 pr_info("Linux is running natively in 64-bit mode\n");
 786 #endif /* CONFIG_64BIT */
 787
 788         /* Have one command line that is parsed and saved in /proc/cmdline */
 789         /* boot_command_line has been already set up in early.c */
 790         *cmdline_p = boot_command_line;
 791
 792         ROOT_DEV = Root_RAM0;
 793
 794         init_mm.start_code = PAGE_OFFSET;
 795         init_mm.end_code = (unsigned long) &_etext;
 796         init_mm.end_data = (unsigned long) &_edata;
 797         init_mm.brk = (unsigned long) &_end;
 798
 799         if (MACHINE_HAS_MVCOS)
 800                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 801         else
 802                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 803
 804         parse_early_param();
 805
 806         setup_ipl();
 807         setup_memory_end();
 808         setup_addressing_mode();
 809         setup_memory();
 810         setup_resources();
 811         setup_lowcore();
 812
 813         cpu_init();
 814         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 815         s390_init_cpu_topology();
 816
 817         /*
 818          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 819          */
 820         setup_hwcaps();
 821
 822         /*
 823          * Create kernel page tables and switch to virtual addressing.
 824          */
 825         paging_init();
 826
 827         /* Setup default console */
 828         conmode_default();
 829
 830         /* Setup zfcpdump support */
 831         setup_zfcpdump(console_devno);
 832 }