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   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 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 machine_flags;
  86 EXPORT_SYMBOL(machine_flags);
  87
  88 unsigned long elf_hwcap = 0;
  89 char elf_platform[ELF_PLATFORM_SIZE];
  90
  91 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  92 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  93
  94 int __initdata memory_end_set;
  95 unsigned long __initdata memory_end;
  96
  97 /* An array with a pointer to the lowcore of every CPU. */
  98 struct _lowcore *lowcore_ptr[NR_CPUS];
  99 EXPORT_SYMBOL(lowcore_ptr);
 100
 101 /*
 102  * This is set up by the setup-routine at boot-time
 103  * for S390 need to find out, what we have to setup
 104  * using address 0x10400 ...
 105  */
 106
 107 #include <asm/setup.h>
 108
 109 static struct resource code_resource = {
 110         .name  = "Kernel code",
 111         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 112 };
 113
 114 static struct resource data_resource = {
 115         .name = "Kernel data",
 116         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 117 };
 118
 119 /*
 120  * cpu_init() initializes state that is per-CPU.
 121  */
 122 void __cpuinit cpu_init(void)
 123 {
 124         /*
 125          * Store processor id in lowcore (used e.g. in timer_interrupt)
 126          */
 127         get_cpu_id(&S390_lowcore.cpu_id);
 128
 129         /*
 130          * Force FPU initialization:
 131          */
 132         clear_thread_flag(TIF_USEDFPU);
 133         clear_used_math();
 134
 135         atomic_inc(&init_mm.mm_count);
 136         current->active_mm = &init_mm;
 137         if (current->mm)
 138                 BUG();
 139         enter_lazy_tlb(&init_mm, current);
 140 }
 141
 142 /*
 143  * condev= and conmode= setup parameter.
 144  */
 145
 146 static int __init condev_setup(char *str)
 147 {
 148         int vdev;
 149
 150         vdev = simple_strtoul(str, &str, 0);
 151         if (vdev >= 0 && vdev < 65536) {
 152                 console_devno = vdev;
 153                 console_irq = -1;
 154         }
 155         return 1;
 156 }
 157
 158 __setup("condev=", condev_setup);
 159
 160 static int __init conmode_setup(char *str)
 161 {
 162 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 163         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 164                 SET_CONSOLE_SCLP;
 165 #endif
 166 #if defined(CONFIG_TN3215_CONSOLE)
 167         if (strncmp(str, "3215", 5) == 0)
 168                 SET_CONSOLE_3215;
 169 #endif
 170 #if defined(CONFIG_TN3270_CONSOLE)
 171         if (strncmp(str, "3270", 5) == 0)
 172                 SET_CONSOLE_3270;
 173 #endif
 174         return 1;
 175 }
 176
 177 __setup("conmode=", conmode_setup);
 178
 179 static void __init conmode_default(void)
 180 {
 181         char query_buffer[1024];
 182         char *ptr;
 183
 184         if (MACHINE_IS_VM) {
 185                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 186                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 187                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 188                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 189                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 190                 ptr = strstr(query_buffer, "CONMODE");
 191                 /*
 192                  * Set the conmode to 3215 so that the device recognition
 193                  * will set the cu_type of the console to 3215. If the
 194                  * conmode is 3270 and we don't set it back then both
 195                  * 3215 and the 3270 driver will try to access the console
 196                  * device (3215 as console and 3270 as normal tty).
 197                  */
 198                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 199                 if (ptr == NULL) {
 200 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 201                         SET_CONSOLE_SCLP;
 202 #endif
 203                         return;
 204                 }
 205                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 206 #if defined(CONFIG_TN3270_CONSOLE)
 207                         SET_CONSOLE_3270;
 208 #elif defined(CONFIG_TN3215_CONSOLE)
 209                         SET_CONSOLE_3215;
 210 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 211                         SET_CONSOLE_SCLP;
 212 #endif
 213                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 214 #if defined(CONFIG_TN3215_CONSOLE)
 215                         SET_CONSOLE_3215;
 216 #elif defined(CONFIG_TN3270_CONSOLE)
 217                         SET_CONSOLE_3270;
 218 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 219                         SET_CONSOLE_SCLP;
 220 #endif
 221                 }
 222         } else {
 223 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 224                 SET_CONSOLE_SCLP;
 225 #endif
 226         }
 227 }
 228
 229 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 230 static void __init setup_zfcpdump(unsigned int console_devno)
 231 {
 232         static char str[41];
 233
 234         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 235                 return;
 236         if (console_devno != -1)
 237                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 238                         ipl_info.data.fcp.dev_id.devno, console_devno);
 239         else
 240                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 241                         ipl_info.data.fcp.dev_id.devno);
 242         strcat(boot_command_line, str);
 243         console_loglevel = 2;
 244 }
 245 #else
 246 static inline void setup_zfcpdump(unsigned int console_devno) {}
 247 #endif /* CONFIG_ZFCPDUMP */
 248
 249  /*
 250  * Reboot, halt and power_off stubs. They just call _machine_restart,
 251  * _machine_halt or _machine_power_off.
 252  */
 253
 254 void machine_restart(char *command)
 255 {
 256         if ((!in_interrupt() && !in_atomic()) || 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_restart(command);
 263 }
 264
 265 void machine_halt(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_halt();
 274 }
 275
 276 void machine_power_off(void)
 277 {
 278         if (!in_interrupt() || oops_in_progress)
 279                 /*
 280                  * Only unblank the console if we are called in enabled
 281                  * context or a bust_spinlocks cleared the way for us.
 282                  */
 283                 console_unblank();
 284         _machine_power_off();
 285 }
 286
 287 /*
 288  * Dummy power off function.
 289  */
 290 void (*pm_power_off)(void) = machine_power_off;
 291
 292 static int __init early_parse_mem(char *p)
 293 {
 294         memory_end = memparse(p, &p);
 295         memory_end_set = 1;
 296         return 0;
 297 }
 298 early_param("mem", early_parse_mem);
 299
 300 #ifdef CONFIG_S390_SWITCH_AMODE
 301 unsigned int switch_amode = 0;
 302 EXPORT_SYMBOL_GPL(switch_amode);
 303
 304 static int set_amode_and_uaccess(unsigned long user_amode,
 305                                  unsigned long user32_amode)
 306 {
 307         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 308                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 309                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 310 #ifdef CONFIG_COMPAT
 311         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 312                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 313                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 314         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 315                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 316                           PSW32_MASK_PSTATE;
 317 #endif
 318         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 319                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 320
 321         if (MACHINE_HAS_MVCOS) {
 322                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 323                 return 1;
 324         } else {
 325                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 326                 return 0;
 327         }
 328 }
 329
 330 /*
 331  * Switch kernel/user addressing modes?
 332  */
 333 static int __init early_parse_switch_amode(char *p)
 334 {
 335         switch_amode = 1;
 336         return 0;
 337 }
 338 early_param("switch_amode", early_parse_switch_amode);
 339
 340 #else /* CONFIG_S390_SWITCH_AMODE */
 341 static inline int set_amode_and_uaccess(unsigned long user_amode,
 342                                         unsigned long user32_amode)
 343 {
 344         return 0;
 345 }
 346 #endif /* CONFIG_S390_SWITCH_AMODE */
 347
 348 #ifdef CONFIG_S390_EXEC_PROTECT
 349 unsigned int s390_noexec = 0;
 350 EXPORT_SYMBOL_GPL(s390_noexec);
 351
 352 /*
 353  * Enable execute protection?
 354  */
 355 static int __init early_parse_noexec(char *p)
 356 {
 357         if (!strncmp(p, "off", 3))
 358                 return 0;
 359         switch_amode = 1;
 360         s390_noexec = 1;
 361         return 0;
 362 }
 363 early_param("noexec", early_parse_noexec);
 364 #endif /* CONFIG_S390_EXEC_PROTECT */
 365
 366 static void setup_addressing_mode(void)
 367 {
 368         if (s390_noexec) {
 369                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 370                                           PSW32_ASC_SECONDARY))
 371                         pr_info("Execute protection active, "
 372                                 "mvcos available\n");
 373                 else
 374                         pr_info("Execute protection active, "
 375                                 "mvcos not available\n");
 376         } else if (switch_amode) {
 377                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 378                         pr_info("Address spaces switched, "
 379                                 "mvcos available\n");
 380                 else
 381                         pr_info("Address spaces switched, "
 382                                 "mvcos not available\n");
 383         }
 384 #ifdef CONFIG_TRACE_IRQFLAGS
 385         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 386         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 387 #endif
 388 }
 389
 390 static void __init
 391 setup_lowcore(void)
 392 {
 393         struct _lowcore *lc;
 394         int lc_pages;
 395
 396         /*
 397          * Setup lowcore for boot cpu
 398          */
 399         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 400         lc = (struct _lowcore *)
 401                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 402         memset(lc, 0, lc_pages * PAGE_SIZE);
 403         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 404         lc->restart_psw.addr =
 405                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 406         if (switch_amode)
 407                 lc->restart_psw.mask |= PSW_ASC_HOME;
 408         lc->external_new_psw.mask = psw_kernel_bits;
 409         lc->external_new_psw.addr =
 410                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 411         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 412         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 413         lc->program_new_psw.mask = psw_kernel_bits;
 414         lc->program_new_psw.addr =
 415                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 416         lc->mcck_new_psw.mask =
 417                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 418         lc->mcck_new_psw.addr =
 419                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 420         lc->io_new_psw.mask = psw_kernel_bits;
 421         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 422         lc->clock_comparator = -1ULL;
 423         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 424         lc->async_stack = (unsigned long)
 425                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 426         lc->panic_stack = (unsigned long)
 427                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 428         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 429         lc->thread_info = (unsigned long) &init_thread_union;
 430 #ifndef CONFIG_64BIT
 431         if (MACHINE_HAS_IEEE) {
 432                 lc->extended_save_area_addr = (__u32)
 433                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 434                 /* enable extended save area */
 435                 __ctl_set_bit(14, 29);
 436         }
 437 #else
 438         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 439 #endif
 440         set_prefix((u32)(unsigned long) lc);
 441         lowcore_ptr[0] = lc;
 442 }
 443
 444 static void __init
 445 setup_resources(void)
 446 {
 447         struct resource *res, *sub_res;
 448         int i;
 449
 450         code_resource.start = (unsigned long) &_text;
 451         code_resource.end = (unsigned long) &_etext - 1;
 452         data_resource.start = (unsigned long) &_etext;
 453         data_resource.end = (unsigned long) &_edata - 1;
 454
 455         for (i = 0; i < MEMORY_CHUNKS; i++) {
 456                 if (!memory_chunk[i].size)
 457                         continue;
 458                 res = alloc_bootmem_low(sizeof(struct resource));
 459                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 460                 switch (memory_chunk[i].type) {
 461                 case CHUNK_READ_WRITE:
 462                         res->name = "System RAM";
 463                         break;
 464                 case CHUNK_READ_ONLY:
 465                         res->name = "System ROM";
 466                         res->flags |= IORESOURCE_READONLY;
 467                         break;
 468                 default:
 469                         res->name = "reserved";
 470                 }
 471                 res->start = memory_chunk[i].addr;
 472                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 473                 request_resource(&iomem_resource, res);
 474
 475                 if (code_resource.start >= res->start  &&
 476                         code_resource.start <= res->end &&
 477                         code_resource.end > res->end) {
 478                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 479                         memcpy(sub_res, &code_resource,
 480                                 sizeof(struct resource));
 481                         sub_res->end = res->end;
 482                         code_resource.start = res->end + 1;
 483                         request_resource(res, sub_res);
 484                 }
 485
 486                 if (code_resource.start >= res->start &&
 487                         code_resource.start <= res->end &&
 488                         code_resource.end <= res->end)
 489                         request_resource(res, &code_resource);
 490
 491                 if (data_resource.start >= res->start &&
 492                         data_resource.start <= res->end &&
 493                         data_resource.end > res->end) {
 494                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 495                         memcpy(sub_res, &data_resource,
 496                                 sizeof(struct resource));
 497                         sub_res->end = res->end;
 498                         data_resource.start = res->end + 1;
 499                         request_resource(res, sub_res);
 500                 }
 501
 502                 if (data_resource.start >= res->start &&
 503                         data_resource.start <= res->end &&
 504                         data_resource.end <= res->end)
 505                         request_resource(res, &data_resource);
 506         }
 507 }
 508
 509 unsigned long real_memory_size;
 510 EXPORT_SYMBOL_GPL(real_memory_size);
 511
 512 static void __init setup_memory_end(void)
 513 {
 514         unsigned long memory_size;
 515         unsigned long max_mem;
 516         int i;
 517
 518 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 519         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 520                 memory_end = ZFCPDUMP_HSA_SIZE;
 521                 memory_end_set = 1;
 522         }
 523 #endif
 524         memory_size = 0;
 525         memory_end &= PAGE_MASK;
 526
 527         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 528         memory_end = min(max_mem, memory_end);
 529
 530         /*
 531          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 532          * extra checks that HOLES_IN_ZONE would require.
 533          */
 534         for (i = 0; i < MEMORY_CHUNKS; i++) {
 535                 unsigned long start, end;
 536                 struct mem_chunk *chunk;
 537                 unsigned long align;
 538
 539                 chunk = &memory_chunk[i];
 540                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 541                 start = (chunk->addr + align - 1) & ~(align - 1);
 542                 end = (chunk->addr + chunk->size) & ~(align - 1);
 543                 if (start >= end)
 544                         memset(chunk, 0, sizeof(*chunk));
 545                 else {
 546                         chunk->addr = start;
 547                         chunk->size = end - start;
 548                 }
 549         }
 550
 551         for (i = 0; i < MEMORY_CHUNKS; i++) {
 552                 struct mem_chunk *chunk = &memory_chunk[i];
 553
 554                 real_memory_size = max(real_memory_size,
 555                                        chunk->addr + chunk->size);
 556                 if (chunk->addr >= max_mem) {
 557                         memset(chunk, 0, sizeof(*chunk));
 558                         continue;
 559                 }
 560                 if (chunk->addr + chunk->size > max_mem)
 561                         chunk->size = max_mem - chunk->addr;
 562                 memory_size = max(memory_size, chunk->addr + chunk->size);
 563         }
 564         if (!memory_end)
 565                 memory_end = memory_size;
 566 }
 567
 568 static void __init
 569 setup_memory(void)
 570 {
 571         unsigned long bootmap_size;
 572         unsigned long start_pfn, end_pfn;
 573         int i;
 574
 575         /*
 576          * partially used pages are not usable - thus
 577          * we are rounding upwards:
 578          */
 579         start_pfn = PFN_UP(__pa(&_end));
 580         end_pfn = max_pfn = PFN_DOWN(memory_end);
 581
 582 #ifdef CONFIG_BLK_DEV_INITRD
 583         /*
 584          * Move the initrd in case the bitmap of the bootmem allocater
 585          * would overwrite it.
 586          */
 587
 588         if (INITRD_START && INITRD_SIZE) {
 589                 unsigned long bmap_size;
 590                 unsigned long start;
 591
 592                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 593                 bmap_size = PFN_PHYS(bmap_size);
 594
 595                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 596                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 597
 598                         if (start + INITRD_SIZE > memory_end) {
 599                                 pr_err("initrd extends beyond end of "
 600                                        "memory (0x%08lx > 0x%08lx) "
 601                                        "disabling initrd\n",
 602                                        start + INITRD_SIZE, memory_end);
 603                                 INITRD_START = INITRD_SIZE = 0;
 604                         } else {
 605                                 pr_info("Moving initrd (0x%08lx -> "
 606                                         "0x%08lx, size: %ld)\n",
 607                                         INITRD_START, start, INITRD_SIZE);
 608                                 memmove((void *) start, (void *) INITRD_START,
 609                                         INITRD_SIZE);
 610                                 INITRD_START = start;
 611                         }
 612                 }
 613         }
 614 #endif
 615
 616         /*
 617          * Initialize the boot-time allocator
 618          */
 619         bootmap_size = init_bootmem(start_pfn, end_pfn);
 620
 621         /*
 622          * Register RAM areas with the bootmem allocator.
 623          */
 624
 625         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 626                 unsigned long start_chunk, end_chunk, pfn;
 627
 628                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 629                         continue;
 630                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 631                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 632                 end_chunk = min(end_chunk, end_pfn);
 633                 if (start_chunk >= end_chunk)
 634                         continue;
 635                 add_active_range(0, start_chunk, end_chunk);
 636                 pfn = max(start_chunk, start_pfn);
 637                 for (; pfn < end_chunk; pfn++)
 638                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 639         }
 640
 641         psw_set_key(PAGE_DEFAULT_KEY);
 642
 643         free_bootmem_with_active_regions(0, max_pfn);
 644
 645         /*
 646          * Reserve memory used for lowcore/command line/kernel image.
 647          */
 648         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 649         reserve_bootmem((unsigned long)_stext,
 650                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 651                         BOOTMEM_DEFAULT);
 652         /*
 653          * Reserve the bootmem bitmap itself as well. We do this in two
 654          * steps (first step was init_bootmem()) because this catches
 655          * the (very unlikely) case of us accidentally initializing the
 656          * bootmem allocator with an invalid RAM area.
 657          */
 658         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 659                         BOOTMEM_DEFAULT);
 660
 661 #ifdef CONFIG_BLK_DEV_INITRD
 662         if (INITRD_START && INITRD_SIZE) {
 663                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 664                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 665                                         BOOTMEM_DEFAULT);
 666                         initrd_start = INITRD_START;
 667                         initrd_end = initrd_start + INITRD_SIZE;
 668                 } else {
 669                         pr_err("initrd extends beyond end of "
 670                                "memory (0x%08lx > 0x%08lx) "
 671                                "disabling initrd\n",
 672                                initrd_start + INITRD_SIZE, memory_end);
 673                         initrd_start = initrd_end = 0;
 674                 }
 675         }
 676 #endif
 677 }
 678
 679 /*
 680  * Setup hardware capabilities.
 681  */
 682 static void __init setup_hwcaps(void)
 683 {
 684         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 685         unsigned long long facility_list_extended;
 686         unsigned int facility_list;
 687         int i;
 688
 689         facility_list = stfl();
 690         /*
 691          * The store facility list bits numbers as found in the principles
 692          * of operation are numbered with bit 1UL<<31 as number 0 to
 693          * bit 1UL<<0 as number 31.
 694          *   Bit 0: instructions named N3, "backported" to esa-mode
 695          *   Bit 2: z/Architecture mode is active
 696          *   Bit 7: the store-facility-list-extended facility is installed
 697          *   Bit 17: the message-security assist is installed
 698          *   Bit 19: the long-displacement facility is installed
 699          *   Bit 21: the extended-immediate facility is installed
 700          * These get translated to:
 701          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 702          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 703          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 704          */
 705         for (i = 0; i < 6; i++)
 706                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 707                         elf_hwcap |= 1UL << i;
 708
 709         /*
 710          * Check for additional facilities with store-facility-list-extended.
 711          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 712          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 713          * as stored by stfl, bits 32-xxx contain additional facilities.
 714          * How many facility words are stored depends on the number of
 715          * doublewords passed to the instruction. The additional facilites
 716          * are:
 717          *   Bit 43: decimal floating point facility is installed
 718          * translated to:
 719          *   HWCAP_S390_DFP bit 6.
 720          */
 721         if ((elf_hwcap & (1UL << 2)) &&
 722             __stfle(&facility_list_extended, 1) > 0) {
 723                 if (facility_list_extended & (1ULL << (64 - 43)))
 724                         elf_hwcap |= 1UL << 6;
 725         }
 726
 727         if (MACHINE_HAS_HPAGE)
 728                 elf_hwcap |= 1UL << 7;
 729
 730         switch (S390_lowcore.cpu_id.machine) {
 731         case 0x9672:
 732 #if !defined(CONFIG_64BIT)
 733         default:        /* Use "g5" as default for 31 bit kernels. */
 734 #endif
 735                 strcpy(elf_platform, "g5");
 736                 break;
 737         case 0x2064:
 738         case 0x2066:
 739 #if defined(CONFIG_64BIT)
 740         default:        /* Use "z900" as default for 64 bit kernels. */
 741 #endif
 742                 strcpy(elf_platform, "z900");
 743                 break;
 744         case 0x2084:
 745         case 0x2086:
 746                 strcpy(elf_platform, "z990");
 747                 break;
 748         case 0x2094:
 749         case 0x2096:
 750                 strcpy(elf_platform, "z9-109");
 751                 break;
 752         case 0x2097:
 753         case 0x2098:
 754                 strcpy(elf_platform, "z10");
 755                 break;
 756         }
 757 }
 758
 759 /*
 760  * Setup function called from init/main.c just after the banner
 761  * was printed.
 762  */
 763
 764 void __init
 765 setup_arch(char **cmdline_p)
 766 {
 767         /* set up preferred console */
 768         add_preferred_console("ttyS", 0, NULL);
 769
 770         /*
 771          * print what head.S has found out about the machine
 772          */
 773 #ifndef CONFIG_64BIT
 774         if (MACHINE_IS_VM)
 775                 pr_info("Linux is running as a z/VM "
 776                         "guest operating system in 31-bit mode\n");
 777         else
 778                 pr_info("Linux is running natively in 31-bit mode\n");
 779         if (MACHINE_HAS_IEEE)
 780                 pr_info("The hardware system has IEEE compatible "
 781                         "floating point units\n");
 782         else
 783                 pr_info("The hardware system has no IEEE compatible "
 784                         "floating point units\n");
 785 #else /* CONFIG_64BIT */
 786         if (MACHINE_IS_VM)
 787                 pr_info("Linux is running as a z/VM "
 788                         "guest operating system in 64-bit mode\n");
 789         else if (MACHINE_IS_KVM) {
 790                 pr_info("Linux is running under KVM in 64-bit mode\n");
 791                 add_preferred_console("hvc", 0, NULL);
 792                 s390_virtio_console_init();
 793         } else
 794                 pr_info("Linux is running natively in 64-bit mode\n");
 795 #endif /* CONFIG_64BIT */
 796
 797         /* Have one command line that is parsed and saved in /proc/cmdline */
 798         /* boot_command_line has been already set up in early.c */
 799         *cmdline_p = boot_command_line;
 800
 801         ROOT_DEV = Root_RAM0;
 802
 803         init_mm.start_code = PAGE_OFFSET;
 804         init_mm.end_code = (unsigned long) &_etext;
 805         init_mm.end_data = (unsigned long) &_edata;
 806         init_mm.brk = (unsigned long) &_end;
 807
 808         if (MACHINE_HAS_MVCOS)
 809                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 810         else
 811                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 812
 813         parse_early_param();
 814
 815         setup_ipl();
 816         setup_memory_end();
 817         setup_addressing_mode();
 818         setup_memory();
 819         setup_resources();
 820         setup_lowcore();
 821
 822         cpu_init();
 823         __cpu_logical_map[0] = stap();
 824         s390_init_cpu_topology();
 825
 826         /*
 827          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 828          */
 829         setup_hwcaps();
 830
 831         /*
 832          * Create kernel page tables and switch to virtual addressing.
 833          */
 834         paging_init();
 835
 836         /* Setup default console */
 837         conmode_default();
 838
 839         /* Setup zfcpdump support */
 840         setup_zfcpdump(console_devno);
 841 }