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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         BUG_ON(current->mm);
 138         enter_lazy_tlb(&init_mm, current);
 139 }
 140
 141 /*
 142  * condev= and conmode= setup parameter.
 143  */
 144
 145 static int __init condev_setup(char *str)
 146 {
 147         int vdev;
 148
 149         vdev = simple_strtoul(str, &str, 0);
 150         if (vdev >= 0 && vdev < 65536) {
 151                 console_devno = vdev;
 152                 console_irq = -1;
 153         }
 154         return 1;
 155 }
 156
 157 __setup("condev=", condev_setup);
 158
 159 static int __init conmode_setup(char *str)
 160 {
 161 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 162         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 163                 SET_CONSOLE_SCLP;
 164 #endif
 165 #if defined(CONFIG_TN3215_CONSOLE)
 166         if (strncmp(str, "3215", 5) == 0)
 167                 SET_CONSOLE_3215;
 168 #endif
 169 #if defined(CONFIG_TN3270_CONSOLE)
 170         if (strncmp(str, "3270", 5) == 0)
 171                 SET_CONSOLE_3270;
 172 #endif
 173         return 1;
 174 }
 175
 176 __setup("conmode=", conmode_setup);
 177
 178 static void __init conmode_default(void)
 179 {
 180         char query_buffer[1024];
 181         char *ptr;
 182
 183         if (MACHINE_IS_VM) {
 184                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 185                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 186                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 187                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 188                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 189                 ptr = strstr(query_buffer, "CONMODE");
 190                 /*
 191                  * Set the conmode to 3215 so that the device recognition
 192                  * will set the cu_type of the console to 3215. If the
 193                  * conmode is 3270 and we don't set it back then both
 194                  * 3215 and the 3270 driver will try to access the console
 195                  * device (3215 as console and 3270 as normal tty).
 196                  */
 197                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 198                 if (ptr == NULL) {
 199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 200                         SET_CONSOLE_SCLP;
 201 #endif
 202                         return;
 203                 }
 204                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 205 #if defined(CONFIG_TN3270_CONSOLE)
 206                         SET_CONSOLE_3270;
 207 #elif defined(CONFIG_TN3215_CONSOLE)
 208                         SET_CONSOLE_3215;
 209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 210                         SET_CONSOLE_SCLP;
 211 #endif
 212                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 213 #if defined(CONFIG_TN3215_CONSOLE)
 214                         SET_CONSOLE_3215;
 215 #elif defined(CONFIG_TN3270_CONSOLE)
 216                         SET_CONSOLE_3270;
 217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 218                         SET_CONSOLE_SCLP;
 219 #endif
 220                 }
 221         } else {
 222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 223                 SET_CONSOLE_SCLP;
 224 #endif
 225         }
 226 }
 227
 228 #ifdef CONFIG_ZFCPDUMP
 229 static void __init setup_zfcpdump(unsigned int console_devno)
 230 {
 231         static char str[41];
 232
 233         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 234                 return;
 235         if (console_devno != -1)
 236                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 237                         ipl_info.data.fcp.dev_id.devno, console_devno);
 238         else
 239                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 240                         ipl_info.data.fcp.dev_id.devno);
 241         strcat(boot_command_line, str);
 242         console_loglevel = 2;
 243 }
 244 #else
 245 static inline void setup_zfcpdump(unsigned int console_devno) {}
 246 #endif /* CONFIG_ZFCPDUMP */
 247
 248  /*
 249  * Reboot, halt and power_off stubs. They just call _machine_restart,
 250  * _machine_halt or _machine_power_off.
 251  */
 252
 253 void machine_restart(char *command)
 254 {
 255         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 256                 /*
 257                  * Only unblank the console if we are called in enabled
 258                  * context or a bust_spinlocks cleared the way for us.
 259                  */
 260                 console_unblank();
 261         _machine_restart(command);
 262 }
 263
 264 void machine_halt(void)
 265 {
 266         if (!in_interrupt() || oops_in_progress)
 267                 /*
 268                  * Only unblank the console if we are called in enabled
 269                  * context or a bust_spinlocks cleared the way for us.
 270                  */
 271                 console_unblank();
 272         _machine_halt();
 273 }
 274
 275 void machine_power_off(void)
 276 {
 277         if (!in_interrupt() || oops_in_progress)
 278                 /*
 279                  * Only unblank the console if we are called in enabled
 280                  * context or a bust_spinlocks cleared the way for us.
 281                  */
 282                 console_unblank();
 283         _machine_power_off();
 284 }
 285
 286 /*
 287  * Dummy power off function.
 288  */
 289 void (*pm_power_off)(void) = machine_power_off;
 290
 291 static int __init early_parse_mem(char *p)
 292 {
 293         memory_end = memparse(p, &p);
 294         memory_end_set = 1;
 295         return 0;
 296 }
 297 early_param("mem", early_parse_mem);
 298
 299 #ifdef CONFIG_S390_SWITCH_AMODE
 300 unsigned int switch_amode = 0;
 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->clock_comparator = -1ULL;
 422         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 423         lc->async_stack = (unsigned long)
 424                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 425         lc->panic_stack = (unsigned long)
 426                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 427         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 428         lc->thread_info = (unsigned long) &init_thread_union;
 429 #ifndef CONFIG_64BIT
 430         if (MACHINE_HAS_IEEE) {
 431                 lc->extended_save_area_addr = (__u32)
 432                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 433                 /* enable extended save area */
 434                 __ctl_set_bit(14, 29);
 435         }
 436 #else
 437         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 438 #endif
 439         set_prefix((u32)(unsigned long) lc);
 440         lowcore_ptr[0] = lc;
 441 }
 442
 443 static void __init
 444 setup_resources(void)
 445 {
 446         struct resource *res, *sub_res;
 447         int i;
 448
 449         code_resource.start = (unsigned long) &_text;
 450         code_resource.end = (unsigned long) &_etext - 1;
 451         data_resource.start = (unsigned long) &_etext;
 452         data_resource.end = (unsigned long) &_edata - 1;
 453
 454         for (i = 0; i < MEMORY_CHUNKS; i++) {
 455                 if (!memory_chunk[i].size)
 456                         continue;
 457                 res = alloc_bootmem_low(sizeof(struct resource));
 458                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 459                 switch (memory_chunk[i].type) {
 460                 case CHUNK_READ_WRITE:
 461                         res->name = "System RAM";
 462                         break;
 463                 case CHUNK_READ_ONLY:
 464                         res->name = "System ROM";
 465                         res->flags |= IORESOURCE_READONLY;
 466                         break;
 467                 default:
 468                         res->name = "reserved";
 469                 }
 470                 res->start = memory_chunk[i].addr;
 471                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 472                 request_resource(&iomem_resource, res);
 473
 474                 if (code_resource.start >= res->start  &&
 475                         code_resource.start <= res->end &&
 476                         code_resource.end > res->end) {
 477                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 478                         memcpy(sub_res, &code_resource,
 479                                 sizeof(struct resource));
 480                         sub_res->end = res->end;
 481                         code_resource.start = res->end + 1;
 482                         request_resource(res, sub_res);
 483                 }
 484
 485                 if (code_resource.start >= res->start &&
 486                         code_resource.start <= res->end &&
 487                         code_resource.end <= res->end)
 488                         request_resource(res, &code_resource);
 489
 490                 if (data_resource.start >= res->start &&
 491                         data_resource.start <= res->end &&
 492                         data_resource.end > res->end) {
 493                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 494                         memcpy(sub_res, &data_resource,
 495                                 sizeof(struct resource));
 496                         sub_res->end = res->end;
 497                         data_resource.start = res->end + 1;
 498                         request_resource(res, sub_res);
 499                 }
 500
 501                 if (data_resource.start >= res->start &&
 502                         data_resource.start <= res->end &&
 503                         data_resource.end <= res->end)
 504                         request_resource(res, &data_resource);
 505         }
 506 }
 507
 508 unsigned long real_memory_size;
 509 EXPORT_SYMBOL_GPL(real_memory_size);
 510
 511 static void __init setup_memory_end(void)
 512 {
 513         unsigned long memory_size;
 514         unsigned long max_mem;
 515         int i;
 516
 517 #ifdef CONFIG_ZFCPDUMP
 518         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 519                 memory_end = ZFCPDUMP_HSA_SIZE;
 520                 memory_end_set = 1;
 521         }
 522 #endif
 523         memory_size = 0;
 524         memory_end &= PAGE_MASK;
 525
 526         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 527         memory_end = min(max_mem, memory_end);
 528
 529         /*
 530          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 531          * extra checks that HOLES_IN_ZONE would require.
 532          */
 533         for (i = 0; i < MEMORY_CHUNKS; i++) {
 534                 unsigned long start, end;
 535                 struct mem_chunk *chunk;
 536                 unsigned long align;
 537
 538                 chunk = &memory_chunk[i];
 539                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 540                 start = (chunk->addr + align - 1) & ~(align - 1);
 541                 end = (chunk->addr + chunk->size) & ~(align - 1);
 542                 if (start >= end)
 543                         memset(chunk, 0, sizeof(*chunk));
 544                 else {
 545                         chunk->addr = start;
 546                         chunk->size = end - start;
 547                 }
 548         }
 549
 550         for (i = 0; i < MEMORY_CHUNKS; i++) {
 551                 struct mem_chunk *chunk = &memory_chunk[i];
 552
 553                 real_memory_size = max(real_memory_size,
 554                                        chunk->addr + chunk->size);
 555                 if (chunk->addr >= max_mem) {
 556                         memset(chunk, 0, sizeof(*chunk));
 557                         continue;
 558                 }
 559                 if (chunk->addr + chunk->size > max_mem)
 560                         chunk->size = max_mem - chunk->addr;
 561                 memory_size = max(memory_size, chunk->addr + chunk->size);
 562         }
 563         if (!memory_end)
 564                 memory_end = memory_size;
 565 }
 566
 567 static void __init
 568 setup_memory(void)
 569 {
 570         unsigned long bootmap_size;
 571         unsigned long start_pfn, end_pfn;
 572         int i;
 573
 574         /*
 575          * partially used pages are not usable - thus
 576          * we are rounding upwards:
 577          */
 578         start_pfn = PFN_UP(__pa(&_end));
 579         end_pfn = max_pfn = PFN_DOWN(memory_end);
 580
 581 #ifdef CONFIG_BLK_DEV_INITRD
 582         /*
 583          * Move the initrd in case the bitmap of the bootmem allocater
 584          * would overwrite it.
 585          */
 586
 587         if (INITRD_START && INITRD_SIZE) {
 588                 unsigned long bmap_size;
 589                 unsigned long start;
 590
 591                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 592                 bmap_size = PFN_PHYS(bmap_size);
 593
 594                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 595                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 596
 597                         if (start + INITRD_SIZE > memory_end) {
 598                                 pr_err("initrd extends beyond end of "
 599                                        "memory (0x%08lx > 0x%08lx) "
 600                                        "disabling initrd\n",
 601                                        start + INITRD_SIZE, memory_end);
 602                                 INITRD_START = INITRD_SIZE = 0;
 603                         } else {
 604                                 pr_info("Moving initrd (0x%08lx -> "
 605                                         "0x%08lx, size: %ld)\n",
 606                                         INITRD_START, start, INITRD_SIZE);
 607                                 memmove((void *) start, (void *) INITRD_START,
 608                                         INITRD_SIZE);
 609                                 INITRD_START = start;
 610                         }
 611                 }
 612         }
 613 #endif
 614
 615         /*
 616          * Initialize the boot-time allocator
 617          */
 618         bootmap_size = init_bootmem(start_pfn, end_pfn);
 619
 620         /*
 621          * Register RAM areas with the bootmem allocator.
 622          */
 623
 624         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 625                 unsigned long start_chunk, end_chunk, pfn;
 626
 627                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 628                         continue;
 629                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 630                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 631                 end_chunk = min(end_chunk, end_pfn);
 632                 if (start_chunk >= end_chunk)
 633                         continue;
 634                 add_active_range(0, start_chunk, end_chunk);
 635                 pfn = max(start_chunk, start_pfn);
 636                 for (; pfn < end_chunk; pfn++)
 637                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 638         }
 639
 640         psw_set_key(PAGE_DEFAULT_KEY);
 641
 642         free_bootmem_with_active_regions(0, max_pfn);
 643
 644         /*
 645          * Reserve memory used for lowcore/command line/kernel image.
 646          */
 647         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 648         reserve_bootmem((unsigned long)_stext,
 649                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 650                         BOOTMEM_DEFAULT);
 651         /*
 652          * Reserve the bootmem bitmap itself as well. We do this in two
 653          * steps (first step was init_bootmem()) because this catches
 654          * the (very unlikely) case of us accidentally initializing the
 655          * bootmem allocator with an invalid RAM area.
 656          */
 657         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 658                         BOOTMEM_DEFAULT);
 659
 660 #ifdef CONFIG_BLK_DEV_INITRD
 661         if (INITRD_START && INITRD_SIZE) {
 662                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 663                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 664                                         BOOTMEM_DEFAULT);
 665                         initrd_start = INITRD_START;
 666                         initrd_end = initrd_start + INITRD_SIZE;
 667                 } else {
 668                         pr_err("initrd extends beyond end of "
 669                                "memory (0x%08lx > 0x%08lx) "
 670                                "disabling initrd\n",
 671                                initrd_start + INITRD_SIZE, memory_end);
 672                         initrd_start = initrd_end = 0;
 673                 }
 674         }
 675 #endif
 676 }
 677
 678 /*
 679  * Setup hardware capabilities.
 680  */
 681 static void __init setup_hwcaps(void)
 682 {
 683         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 684         unsigned long long facility_list_extended;
 685         unsigned int facility_list;
 686         int i;
 687
 688         facility_list = stfl();
 689         /*
 690          * The store facility list bits numbers as found in the principles
 691          * of operation are numbered with bit 1UL<<31 as number 0 to
 692          * bit 1UL<<0 as number 31.
 693          *   Bit 0: instructions named N3, "backported" to esa-mode
 694          *   Bit 2: z/Architecture mode is active
 695          *   Bit 7: the store-facility-list-extended facility is installed
 696          *   Bit 17: the message-security assist is installed
 697          *   Bit 19: the long-displacement facility is installed
 698          *   Bit 21: the extended-immediate facility is installed
 699          * These get translated to:
 700          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 701          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 702          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 703          */
 704         for (i = 0; i < 6; i++)
 705                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 706                         elf_hwcap |= 1UL << i;
 707
 708         /*
 709          * Check for additional facilities with store-facility-list-extended.
 710          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 711          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 712          * as stored by stfl, bits 32-xxx contain additional facilities.
 713          * How many facility words are stored depends on the number of
 714          * doublewords passed to the instruction. The additional facilites
 715          * are:
 716          *   Bit 43: decimal floating point facility is installed
 717          * translated to:
 718          *   HWCAP_S390_DFP bit 6.
 719          */
 720         if ((elf_hwcap & (1UL << 2)) &&
 721             __stfle(&facility_list_extended, 1) > 0) {
 722                 if (facility_list_extended & (1ULL << (64 - 43)))
 723                         elf_hwcap |= 1UL << 6;
 724         }
 725
 726         if (MACHINE_HAS_HPAGE)
 727                 elf_hwcap |= 1UL << 7;
 728
 729         switch (S390_lowcore.cpu_id.machine) {
 730         case 0x9672:
 731 #if !defined(CONFIG_64BIT)
 732         default:        /* Use "g5" as default for 31 bit kernels. */
 733 #endif
 734                 strcpy(elf_platform, "g5");
 735                 break;
 736         case 0x2064:
 737         case 0x2066:
 738 #if defined(CONFIG_64BIT)
 739         default:        /* Use "z900" as default for 64 bit kernels. */
 740 #endif
 741                 strcpy(elf_platform, "z900");
 742                 break;
 743         case 0x2084:
 744         case 0x2086:
 745                 strcpy(elf_platform, "z990");
 746                 break;
 747         case 0x2094:
 748         case 0x2096:
 749                 strcpy(elf_platform, "z9-109");
 750                 break;
 751         case 0x2097:
 752         case 0x2098:
 753                 strcpy(elf_platform, "z10");
 754                 break;
 755         }
 756 }
 757
 758 /*
 759  * Setup function called from init/main.c just after the banner
 760  * was printed.
 761  */
 762
 763 void __init
 764 setup_arch(char **cmdline_p)
 765 {
 766         /* set up preferred console */
 767         add_preferred_console("ttyS", 0, NULL);
 768
 769         /*
 770          * print what head.S has found out about the machine
 771          */
 772 #ifndef CONFIG_64BIT
 773         if (MACHINE_IS_VM)
 774                 pr_info("Linux is running as a z/VM "
 775                         "guest operating system in 31-bit mode\n");
 776         else
 777                 pr_info("Linux is running natively in 31-bit mode\n");
 778         if (MACHINE_HAS_IEEE)
 779                 pr_info("The hardware system has IEEE compatible "
 780                         "floating point units\n");
 781         else
 782                 pr_info("The hardware system has no IEEE compatible "
 783                         "floating point units\n");
 784 #else /* CONFIG_64BIT */
 785         if (MACHINE_IS_VM)
 786                 pr_info("Linux is running as a z/VM "
 787                         "guest operating system in 64-bit mode\n");
 788         else if (MACHINE_IS_KVM) {
 789                 pr_info("Linux is running under KVM in 64-bit mode\n");
 790                 add_preferred_console("hvc", 0, NULL);
 791                 s390_virtio_console_init();
 792         } else
 793                 pr_info("Linux is running natively in 64-bit mode\n");
 794 #endif /* CONFIG_64BIT */
 795
 796         /* Have one command line that is parsed and saved in /proc/cmdline */
 797         /* boot_command_line has been already set up in early.c */
 798         *cmdline_p = boot_command_line;
 799
 800         ROOT_DEV = Root_RAM0;
 801
 802         init_mm.start_code = PAGE_OFFSET;
 803         init_mm.end_code = (unsigned long) &_etext;
 804         init_mm.end_data = (unsigned long) &_edata;
 805         init_mm.brk = (unsigned long) &_end;
 806
 807         if (MACHINE_HAS_MVCOS)
 808                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 809         else
 810                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 811
 812         parse_early_param();
 813
 814         setup_ipl();
 815         setup_memory_end();
 816         setup_addressing_mode();
 817         setup_memory();
 818         setup_resources();
 819         setup_lowcore();
 820
 821         cpu_init();
 822         __cpu_logical_map[0] = stap();
 823         s390_init_cpu_topology();
 824
 825         /*
 826          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 827          */
 828         setup_hwcaps();
 829
 830         /*
 831          * Create kernel page tables and switch to virtual addressing.
 832          */
 833         paging_init();
 834
 835         /* Setup default console */
 836         conmode_default();
 837
 838         /* Setup zfcpdump support */
 839         setup_zfcpdump(console_devno);
 840 }