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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 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
  86 int __initdata memory_end_set;
  87 unsigned long __initdata memory_end;
  88
  89 /* An array with a pointer to the lowcore of every CPU. */
  90 struct _lowcore *lowcore_ptr[NR_CPUS];
  91 EXPORT_SYMBOL(lowcore_ptr);
  92
  93 /*
  94  * This is set up by the setup-routine at boot-time
  95  * for S390 need to find out, what we have to setup
  96  * using address 0x10400 ...
  97  */
  98
  99 #include <asm/setup.h>
 100
 101 static struct resource code_resource = {
 102         .name  = "Kernel code",
 103         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 104 };
 105
 106 static struct resource data_resource = {
 107         .name = "Kernel data",
 108         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 109 };
 110
 111 /*
 112  * cpu_init() initializes state that is per-CPU.
 113  */
 114 void __cpuinit cpu_init(void)
 115 {
 116         int addr = hard_smp_processor_id();
 117
 118         /*
 119          * Store processor id in lowcore (used e.g. in timer_interrupt)
 120          */
 121         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 122         S390_lowcore.cpu_data.cpu_addr = addr;
 123
 124         /*
 125          * Force FPU initialization:
 126          */
 127         clear_thread_flag(TIF_USEDFPU);
 128         clear_used_math();
 129
 130         atomic_inc(&init_mm.mm_count);
 131         current->active_mm = &init_mm;
 132         if (current->mm)
 133                 BUG();
 134         enter_lazy_tlb(&init_mm, current);
 135 }
 136
 137 /*
 138  * condev= and conmode= setup parameter.
 139  */
 140
 141 static int __init condev_setup(char *str)
 142 {
 143         int vdev;
 144
 145         vdev = simple_strtoul(str, &str, 0);
 146         if (vdev >= 0 && vdev < 65536) {
 147                 console_devno = vdev;
 148                 console_irq = -1;
 149         }
 150         return 1;
 151 }
 152
 153 __setup("condev=", condev_setup);
 154
 155 static int __init conmode_setup(char *str)
 156 {
 157 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 158         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 159                 SET_CONSOLE_SCLP;
 160 #endif
 161 #if defined(CONFIG_TN3215_CONSOLE)
 162         if (strncmp(str, "3215", 5) == 0)
 163                 SET_CONSOLE_3215;
 164 #endif
 165 #if defined(CONFIG_TN3270_CONSOLE)
 166         if (strncmp(str, "3270", 5) == 0)
 167                 SET_CONSOLE_3270;
 168 #endif
 169         return 1;
 170 }
 171
 172 __setup("conmode=", conmode_setup);
 173
 174 static void __init conmode_default(void)
 175 {
 176         char query_buffer[1024];
 177         char *ptr;
 178
 179         if (MACHINE_IS_VM) {
 180                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 181                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 182                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 183                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 184                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 185                 ptr = strstr(query_buffer, "CONMODE");
 186                 /*
 187                  * Set the conmode to 3215 so that the device recognition
 188                  * will set the cu_type of the console to 3215. If the
 189                  * conmode is 3270 and we don't set it back then both
 190                  * 3215 and the 3270 driver will try to access the console
 191                  * device (3215 as console and 3270 as normal tty).
 192                  */
 193                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 194                 if (ptr == NULL) {
 195 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 196                         SET_CONSOLE_SCLP;
 197 #endif
 198                         return;
 199                 }
 200                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 201 #if defined(CONFIG_TN3270_CONSOLE)
 202                         SET_CONSOLE_3270;
 203 #elif defined(CONFIG_TN3215_CONSOLE)
 204                         SET_CONSOLE_3215;
 205 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 206                         SET_CONSOLE_SCLP;
 207 #endif
 208                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 209 #if defined(CONFIG_TN3215_CONSOLE)
 210                         SET_CONSOLE_3215;
 211 #elif defined(CONFIG_TN3270_CONSOLE)
 212                         SET_CONSOLE_3270;
 213 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 214                         SET_CONSOLE_SCLP;
 215 #endif
 216                 }
 217         } else {
 218 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 219                 SET_CONSOLE_SCLP;
 220 #endif
 221         }
 222 }
 223
 224 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 225 static void __init setup_zfcpdump(unsigned int console_devno)
 226 {
 227         static char str[41];
 228
 229         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 230                 return;
 231         if (console_devno != -1)
 232                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 233                         ipl_info.data.fcp.dev_id.devno, console_devno);
 234         else
 235                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 236                         ipl_info.data.fcp.dev_id.devno);
 237         strcat(boot_command_line, str);
 238         console_loglevel = 2;
 239 }
 240 #else
 241 static inline void setup_zfcpdump(unsigned int console_devno) {}
 242 #endif /* CONFIG_ZFCPDUMP */
 243
 244  /*
 245  * Reboot, halt and power_off stubs. They just call _machine_restart,
 246  * _machine_halt or _machine_power_off.
 247  */
 248
 249 void machine_restart(char *command)
 250 {
 251         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 252                 /*
 253                  * Only unblank the console if we are called in enabled
 254                  * context or a bust_spinlocks cleared the way for us.
 255                  */
 256                 console_unblank();
 257         _machine_restart(command);
 258 }
 259
 260 void machine_halt(void)
 261 {
 262         if (!in_interrupt() || oops_in_progress)
 263                 /*
 264                  * Only unblank the console if we are called in enabled
 265                  * context or a bust_spinlocks cleared the way for us.
 266                  */
 267                 console_unblank();
 268         _machine_halt();
 269 }
 270
 271 void machine_power_off(void)
 272 {
 273         if (!in_interrupt() || oops_in_progress)
 274                 /*
 275                  * Only unblank the console if we are called in enabled
 276                  * context or a bust_spinlocks cleared the way for us.
 277                  */
 278                 console_unblank();
 279         _machine_power_off();
 280 }
 281
 282 /*
 283  * Dummy power off function.
 284  */
 285 void (*pm_power_off)(void) = machine_power_off;
 286
 287 static int __init early_parse_mem(char *p)
 288 {
 289         memory_end = memparse(p, &p);
 290         memory_end_set = 1;
 291         return 0;
 292 }
 293 early_param("mem", early_parse_mem);
 294
 295 #ifdef CONFIG_S390_SWITCH_AMODE
 296 #ifdef CONFIG_PGSTE
 297 unsigned int switch_amode = 1;
 298 #else
 299 unsigned int switch_amode = 0;
 300 #endif
 301 EXPORT_SYMBOL_GPL(switch_amode);
 302
 303 static int set_amode_and_uaccess(unsigned long user_amode,
 304                                  unsigned long user32_amode)
 305 {
 306         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 307                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 308                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 309 #ifdef CONFIG_COMPAT
 310         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 311                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 312                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 313         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 314                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 315                           PSW32_MASK_PSTATE;
 316 #endif
 317         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 318                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 319
 320         if (MACHINE_HAS_MVCOS) {
 321                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 322                 return 1;
 323         } else {
 324                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 325                 return 0;
 326         }
 327 }
 328
 329 /*
 330  * Switch kernel/user addressing modes?
 331  */
 332 static int __init early_parse_switch_amode(char *p)
 333 {
 334         switch_amode = 1;
 335         return 0;
 336 }
 337 early_param("switch_amode", early_parse_switch_amode);
 338
 339 #else /* CONFIG_S390_SWITCH_AMODE */
 340 static inline int set_amode_and_uaccess(unsigned long user_amode,
 341                                         unsigned long user32_amode)
 342 {
 343         return 0;
 344 }
 345 #endif /* CONFIG_S390_SWITCH_AMODE */
 346
 347 #ifdef CONFIG_S390_EXEC_PROTECT
 348 unsigned int s390_noexec = 0;
 349 EXPORT_SYMBOL_GPL(s390_noexec);
 350
 351 /*
 352  * Enable execute protection?
 353  */
 354 static int __init early_parse_noexec(char *p)
 355 {
 356         if (!strncmp(p, "off", 3))
 357                 return 0;
 358         switch_amode = 1;
 359         s390_noexec = 1;
 360         return 0;
 361 }
 362 early_param("noexec", early_parse_noexec);
 363 #endif /* CONFIG_S390_EXEC_PROTECT */
 364
 365 static void setup_addressing_mode(void)
 366 {
 367         if (s390_noexec) {
 368                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 369                                           PSW32_ASC_SECONDARY))
 370                         pr_info("Execute protection active, "
 371                                 "mvcos available\n");
 372                 else
 373                         pr_info("Execute protection active, "
 374                                 "mvcos not available\n");
 375         } else if (switch_amode) {
 376                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 377                         pr_info("Address spaces switched, "
 378                                 "mvcos available\n");
 379                 else
 380                         pr_info("Address spaces switched, "
 381                                 "mvcos not available\n");
 382         }
 383 #ifdef CONFIG_TRACE_IRQFLAGS
 384         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 385         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 386 #endif
 387 }
 388
 389 static void __init
 390 setup_lowcore(void)
 391 {
 392         struct _lowcore *lc;
 393         int lc_pages;
 394
 395         /*
 396          * Setup lowcore for boot cpu
 397          */
 398         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 399         lc = (struct _lowcore *)
 400                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 401         memset(lc, 0, lc_pages * PAGE_SIZE);
 402         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 403         lc->restart_psw.addr =
 404                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 405         if (switch_amode)
 406                 lc->restart_psw.mask |= PSW_ASC_HOME;
 407         lc->external_new_psw.mask = psw_kernel_bits;
 408         lc->external_new_psw.addr =
 409                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 410         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 411         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 412         lc->program_new_psw.mask = psw_kernel_bits;
 413         lc->program_new_psw.addr =
 414                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 415         lc->mcck_new_psw.mask =
 416                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 417         lc->mcck_new_psw.addr =
 418                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 419         lc->io_new_psw.mask = psw_kernel_bits;
 420         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 421         lc->ipl_device = S390_lowcore.ipl_device;
 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         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 686         unsigned long long facility_list_extended;
 687         unsigned int facility_list;
 688         int i;
 689
 690         facility_list = stfl();
 691         /*
 692          * The store facility list bits numbers as found in the principles
 693          * of operation are numbered with bit 1UL<<31 as number 0 to
 694          * bit 1UL<<0 as number 31.
 695          *   Bit 0: instructions named N3, "backported" to esa-mode
 696          *   Bit 2: z/Architecture mode is active
 697          *   Bit 7: the store-facility-list-extended facility is installed
 698          *   Bit 17: the message-security assist is installed
 699          *   Bit 19: the long-displacement facility is installed
 700          *   Bit 21: the extended-immediate facility is installed
 701          * These get translated to:
 702          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 703          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 704          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 705          */
 706         for (i = 0; i < 6; i++)
 707                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 708                         elf_hwcap |= 1UL << i;
 709
 710         /*
 711          * Check for additional facilities with store-facility-list-extended.
 712          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 713          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 714          * as stored by stfl, bits 32-xxx contain additional facilities.
 715          * How many facility words are stored depends on the number of
 716          * doublewords passed to the instruction. The additional facilites
 717          * are:
 718          *   Bit 43: decimal floating point facility is installed
 719          * translated to:
 720          *   HWCAP_S390_DFP bit 6.
 721          */
 722         if ((elf_hwcap & (1UL << 2)) &&
 723             __stfle(&facility_list_extended, 1) > 0) {
 724                 if (facility_list_extended & (1ULL << (64 - 43)))
 725                         elf_hwcap |= 1UL << 6;
 726         }
 727
 728         if (MACHINE_HAS_HPAGE)
 729                 elf_hwcap |= 1UL << 7;
 730
 731         switch (cpuinfo->cpu_id.machine) {
 732         case 0x9672:
 733 #if !defined(CONFIG_64BIT)
 734         default:        /* Use "g5" as default for 31 bit kernels. */
 735 #endif
 736                 strcpy(elf_platform, "g5");
 737                 break;
 738         case 0x2064:
 739         case 0x2066:
 740 #if defined(CONFIG_64BIT)
 741         default:        /* Use "z900" as default for 64 bit kernels. */
 742 #endif
 743                 strcpy(elf_platform, "z900");
 744                 break;
 745         case 0x2084:
 746         case 0x2086:
 747                 strcpy(elf_platform, "z990");
 748                 break;
 749         case 0x2094:
 750         case 0x2096:
 751                 strcpy(elf_platform, "z9-109");
 752                 break;
 753         case 0x2097:
 754         case 0x2098:
 755                 strcpy(elf_platform, "z10");
 756                 break;
 757         }
 758 }
 759
 760 /*
 761  * Setup function called from init/main.c just after the banner
 762  * was printed.
 763  */
 764
 765 void __init
 766 setup_arch(char **cmdline_p)
 767 {
 768         /* set up preferred console */
 769         add_preferred_console("ttyS", 0, NULL);
 770
 771         /*
 772          * print what head.S has found out about the machine
 773          */
 774 #ifndef CONFIG_64BIT
 775         if (MACHINE_IS_VM)
 776                 pr_info("Linux is running as a z/VM "
 777                         "guest operating system in 31-bit mode\n");
 778         else
 779                 pr_info("Linux is running natively in 31-bit mode\n");
 780         if (MACHINE_HAS_IEEE)
 781                 pr_info("The hardware system has IEEE compatible "
 782                         "floating point units\n");
 783         else
 784                 pr_info("The hardware system has no IEEE compatible "
 785                         "floating point units\n");
 786 #else /* CONFIG_64BIT */
 787         if (MACHINE_IS_VM)
 788                 pr_info("Linux is running as a z/VM "
 789                         "guest operating system in 64-bit mode\n");
 790         else if (MACHINE_IS_KVM) {
 791                 pr_info("Linux is running under KVM in 64-bit mode\n");
 792                 add_preferred_console("hvc", 0, NULL);
 793                 s390_virtio_console_init();
 794         } else
 795                 pr_info("Linux is running natively in 64-bit mode\n");
 796 #endif /* CONFIG_64BIT */
 797
 798         /* Have one command line that is parsed and saved in /proc/cmdline */
 799         /* boot_command_line has been already set up in early.c */
 800         *cmdline_p = boot_command_line;
 801
 802         ROOT_DEV = Root_RAM0;
 803
 804         init_mm.start_code = PAGE_OFFSET;
 805         init_mm.end_code = (unsigned long) &_etext;
 806         init_mm.end_data = (unsigned long) &_edata;
 807         init_mm.brk = (unsigned long) &_end;
 808
 809         if (MACHINE_HAS_MVCOS)
 810                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 811         else
 812                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 813
 814         parse_early_param();
 815
 816         setup_ipl();
 817         setup_memory_end();
 818         setup_addressing_mode();
 819         setup_memory();
 820         setup_resources();
 821         setup_lowcore();
 822
 823         cpu_init();
 824         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 825         s390_init_cpu_topology();
 826
 827         /*
 828          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 829          */
 830         setup_hwcaps();
 831
 832         /*
 833          * Create kernel page tables and switch to virtual addressing.
 834          */
 835         paging_init();
 836
 837         /* Setup default console */
 838         conmode_default();
 839
 840         /* Setup zfcpdump support */
 841         setup_zfcpdump(console_devno);
 842 }