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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 /*
  90  * This is set up by the setup-routine at boot-time
  91  * for S390 need to find out, what we have to setup
  92  * using address 0x10400 ...
  93  */
  94
  95 #include <asm/setup.h>
  96
  97 static struct resource code_resource = {
  98         .name  = "Kernel code",
  99         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 100 };
 101
 102 static struct resource data_resource = {
 103         .name = "Kernel data",
 104         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 105 };
 106
 107 /*
 108  * cpu_init() initializes state that is per-CPU.
 109  */
 110 void __cpuinit cpu_init(void)
 111 {
 112         int addr = hard_smp_processor_id();
 113
 114         /*
 115          * Store processor id in lowcore (used e.g. in timer_interrupt)
 116          */
 117         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 118         S390_lowcore.cpu_data.cpu_addr = addr;
 119
 120         /*
 121          * Force FPU initialization:
 122          */
 123         clear_thread_flag(TIF_USEDFPU);
 124         clear_used_math();
 125
 126         atomic_inc(&init_mm.mm_count);
 127         current->active_mm = &init_mm;
 128         if (current->mm)
 129                 BUG();
 130         enter_lazy_tlb(&init_mm, current);
 131 }
 132
 133 /*
 134  * condev= and conmode= setup parameter.
 135  */
 136
 137 static int __init condev_setup(char *str)
 138 {
 139         int vdev;
 140
 141         vdev = simple_strtoul(str, &str, 0);
 142         if (vdev >= 0 && vdev < 65536) {
 143                 console_devno = vdev;
 144                 console_irq = -1;
 145         }
 146         return 1;
 147 }
 148
 149 __setup("condev=", condev_setup);
 150
 151 static int __init conmode_setup(char *str)
 152 {
 153 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 154         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 155                 SET_CONSOLE_SCLP;
 156 #endif
 157 #if defined(CONFIG_TN3215_CONSOLE)
 158         if (strncmp(str, "3215", 5) == 0)
 159                 SET_CONSOLE_3215;
 160 #endif
 161 #if defined(CONFIG_TN3270_CONSOLE)
 162         if (strncmp(str, "3270", 5) == 0)
 163                 SET_CONSOLE_3270;
 164 #endif
 165         return 1;
 166 }
 167
 168 __setup("conmode=", conmode_setup);
 169
 170 static void __init conmode_default(void)
 171 {
 172         char query_buffer[1024];
 173         char *ptr;
 174
 175         if (MACHINE_IS_VM) {
 176                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 177                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 178                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 179                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 180                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 181                 ptr = strstr(query_buffer, "CONMODE");
 182                 /*
 183                  * Set the conmode to 3215 so that the device recognition
 184                  * will set the cu_type of the console to 3215. If the
 185                  * conmode is 3270 and we don't set it back then both
 186                  * 3215 and the 3270 driver will try to access the console
 187                  * device (3215 as console and 3270 as normal tty).
 188                  */
 189                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 190                 if (ptr == NULL) {
 191 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 192                         SET_CONSOLE_SCLP;
 193 #endif
 194                         return;
 195                 }
 196                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 197 #if defined(CONFIG_TN3270_CONSOLE)
 198                         SET_CONSOLE_3270;
 199 #elif defined(CONFIG_TN3215_CONSOLE)
 200                         SET_CONSOLE_3215;
 201 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 202                         SET_CONSOLE_SCLP;
 203 #endif
 204                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 205 #if defined(CONFIG_TN3215_CONSOLE)
 206                         SET_CONSOLE_3215;
 207 #elif defined(CONFIG_TN3270_CONSOLE)
 208                         SET_CONSOLE_3270;
 209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 210                         SET_CONSOLE_SCLP;
 211 #endif
 212                 }
 213         } else {
 214 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 215                 SET_CONSOLE_SCLP;
 216 #endif
 217         }
 218 }
 219
 220 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 221 static void __init setup_zfcpdump(unsigned int console_devno)
 222 {
 223         static char str[41];
 224
 225         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 226                 return;
 227         if (console_devno != -1)
 228                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 229                         ipl_info.data.fcp.dev_id.devno, console_devno);
 230         else
 231                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 232                         ipl_info.data.fcp.dev_id.devno);
 233         strcat(boot_command_line, str);
 234         console_loglevel = 2;
 235 }
 236 #else
 237 static inline void setup_zfcpdump(unsigned int console_devno) {}
 238 #endif /* CONFIG_ZFCPDUMP */
 239
 240  /*
 241  * Reboot, halt and power_off stubs. They just call _machine_restart,
 242  * _machine_halt or _machine_power_off.
 243  */
 244
 245 void machine_restart(char *command)
 246 {
 247         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 248                 /*
 249                  * Only unblank the console if we are called in enabled
 250                  * context or a bust_spinlocks cleared the way for us.
 251                  */
 252                 console_unblank();
 253         _machine_restart(command);
 254 }
 255
 256 void machine_halt(void)
 257 {
 258         if (!in_interrupt() || oops_in_progress)
 259                 /*
 260                  * Only unblank the console if we are called in enabled
 261                  * context or a bust_spinlocks cleared the way for us.
 262                  */
 263                 console_unblank();
 264         _machine_halt();
 265 }
 266
 267 void machine_power_off(void)
 268 {
 269         if (!in_interrupt() || oops_in_progress)
 270                 /*
 271                  * Only unblank the console if we are called in enabled
 272                  * context or a bust_spinlocks cleared the way for us.
 273                  */
 274                 console_unblank();
 275         _machine_power_off();
 276 }
 277
 278 /*
 279  * Dummy power off function.
 280  */
 281 void (*pm_power_off)(void) = machine_power_off;
 282
 283 static int __init early_parse_mem(char *p)
 284 {
 285         memory_end = memparse(p, &p);
 286         memory_end_set = 1;
 287         return 0;
 288 }
 289 early_param("mem", early_parse_mem);
 290
 291 #ifdef CONFIG_S390_SWITCH_AMODE
 292 #ifdef CONFIG_PGSTE
 293 unsigned int switch_amode = 1;
 294 #else
 295 unsigned int switch_amode = 0;
 296 #endif
 297 EXPORT_SYMBOL_GPL(switch_amode);
 298
 299 static int set_amode_and_uaccess(unsigned long user_amode,
 300                                  unsigned long user32_amode)
 301 {
 302         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 303                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 304                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 305 #ifdef CONFIG_COMPAT
 306         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 307                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 308                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 309         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 310                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 311                           PSW32_MASK_PSTATE;
 312 #endif
 313         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 314                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 315
 316         if (MACHINE_HAS_MVCOS) {
 317                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 318                 return 1;
 319         } else {
 320                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 321                 return 0;
 322         }
 323 }
 324
 325 /*
 326  * Switch kernel/user addressing modes?
 327  */
 328 static int __init early_parse_switch_amode(char *p)
 329 {
 330         switch_amode = 1;
 331         return 0;
 332 }
 333 early_param("switch_amode", early_parse_switch_amode);
 334
 335 #else /* CONFIG_S390_SWITCH_AMODE */
 336 static inline int set_amode_and_uaccess(unsigned long user_amode,
 337                                         unsigned long user32_amode)
 338 {
 339         return 0;
 340 }
 341 #endif /* CONFIG_S390_SWITCH_AMODE */
 342
 343 #ifdef CONFIG_S390_EXEC_PROTECT
 344 unsigned int s390_noexec = 0;
 345 EXPORT_SYMBOL_GPL(s390_noexec);
 346
 347 /*
 348  * Enable execute protection?
 349  */
 350 static int __init early_parse_noexec(char *p)
 351 {
 352         if (!strncmp(p, "off", 3))
 353                 return 0;
 354         switch_amode = 1;
 355         s390_noexec = 1;
 356         return 0;
 357 }
 358 early_param("noexec", early_parse_noexec);
 359 #endif /* CONFIG_S390_EXEC_PROTECT */
 360
 361 static void setup_addressing_mode(void)
 362 {
 363         if (s390_noexec) {
 364                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 365                                           PSW32_ASC_SECONDARY))
 366                         pr_info("Execute protection active, "
 367                                 "mvcos available\n");
 368                 else
 369                         pr_info("Execute protection active, "
 370                                 "mvcos not available\n");
 371         } else if (switch_amode) {
 372                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 373                         pr_info("Address spaces switched, "
 374                                 "mvcos available\n");
 375                 else
 376                         pr_info("Address spaces switched, "
 377                                 "mvcos not available\n");
 378         }
 379 #ifdef CONFIG_TRACE_IRQFLAGS
 380         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 381         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 382 #endif
 383 }
 384
 385 static void __init
 386 setup_lowcore(void)
 387 {
 388         struct _lowcore *lc;
 389         int lc_pages;
 390
 391         /*
 392          * Setup lowcore for boot cpu
 393          */
 394         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 395         lc = (struct _lowcore *)
 396                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 397         memset(lc, 0, lc_pages * PAGE_SIZE);
 398         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 399         lc->restart_psw.addr =
 400                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 401         if (switch_amode)
 402                 lc->restart_psw.mask |= PSW_ASC_HOME;
 403         lc->external_new_psw.mask = psw_kernel_bits;
 404         lc->external_new_psw.addr =
 405                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 406         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 407         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 408         lc->program_new_psw.mask = psw_kernel_bits;
 409         lc->program_new_psw.addr =
 410                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 411         lc->mcck_new_psw.mask =
 412                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 413         lc->mcck_new_psw.addr =
 414                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 415         lc->io_new_psw.mask = psw_kernel_bits;
 416         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 417         lc->ipl_device = S390_lowcore.ipl_device;
 418         lc->clock_comparator = -1ULL;
 419         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 420         lc->async_stack = (unsigned long)
 421                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 422         lc->panic_stack = (unsigned long)
 423                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 424         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 425         lc->thread_info = (unsigned long) &init_thread_union;
 426 #ifndef CONFIG_64BIT
 427         if (MACHINE_HAS_IEEE) {
 428                 lc->extended_save_area_addr = (__u32)
 429                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 430                 /* enable extended save area */
 431                 __ctl_set_bit(14, 29);
 432         }
 433 #else
 434         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 435 #endif
 436         set_prefix((u32)(unsigned long) lc);
 437 }
 438
 439 static void __init
 440 setup_resources(void)
 441 {
 442         struct resource *res, *sub_res;
 443         int i;
 444
 445         code_resource.start = (unsigned long) &_text;
 446         code_resource.end = (unsigned long) &_etext - 1;
 447         data_resource.start = (unsigned long) &_etext;
 448         data_resource.end = (unsigned long) &_edata - 1;
 449
 450         for (i = 0; i < MEMORY_CHUNKS; i++) {
 451                 if (!memory_chunk[i].size)
 452                         continue;
 453                 res = alloc_bootmem_low(sizeof(struct resource));
 454                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 455                 switch (memory_chunk[i].type) {
 456                 case CHUNK_READ_WRITE:
 457                         res->name = "System RAM";
 458                         break;
 459                 case CHUNK_READ_ONLY:
 460                         res->name = "System ROM";
 461                         res->flags |= IORESOURCE_READONLY;
 462                         break;
 463                 default:
 464                         res->name = "reserved";
 465                 }
 466                 res->start = memory_chunk[i].addr;
 467                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 468                 request_resource(&iomem_resource, res);
 469
 470                 if (code_resource.start >= res->start  &&
 471                         code_resource.start <= res->end &&
 472                         code_resource.end > res->end) {
 473                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 474                         memcpy(sub_res, &code_resource,
 475                                 sizeof(struct resource));
 476                         sub_res->end = res->end;
 477                         code_resource.start = res->end + 1;
 478                         request_resource(res, sub_res);
 479                 }
 480
 481                 if (code_resource.start >= res->start &&
 482                         code_resource.start <= res->end &&
 483                         code_resource.end <= res->end)
 484                         request_resource(res, &code_resource);
 485
 486                 if (data_resource.start >= res->start &&
 487                         data_resource.start <= res->end &&
 488                         data_resource.end > res->end) {
 489                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 490                         memcpy(sub_res, &data_resource,
 491                                 sizeof(struct resource));
 492                         sub_res->end = res->end;
 493                         data_resource.start = res->end + 1;
 494                         request_resource(res, sub_res);
 495                 }
 496
 497                 if (data_resource.start >= res->start &&
 498                         data_resource.start <= res->end &&
 499                         data_resource.end <= res->end)
 500                         request_resource(res, &data_resource);
 501         }
 502 }
 503
 504 unsigned long real_memory_size;
 505 EXPORT_SYMBOL_GPL(real_memory_size);
 506
 507 static void __init setup_memory_end(void)
 508 {
 509         unsigned long memory_size;
 510         unsigned long max_mem;
 511         int i;
 512
 513 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 514         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 515                 memory_end = ZFCPDUMP_HSA_SIZE;
 516                 memory_end_set = 1;
 517         }
 518 #endif
 519         memory_size = 0;
 520         memory_end &= PAGE_MASK;
 521
 522         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 523         memory_end = min(max_mem, memory_end);
 524
 525         /*
 526          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 527          * extra checks that HOLES_IN_ZONE would require.
 528          */
 529         for (i = 0; i < MEMORY_CHUNKS; i++) {
 530                 unsigned long start, end;
 531                 struct mem_chunk *chunk;
 532                 unsigned long align;
 533
 534                 chunk = &memory_chunk[i];
 535                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 536                 start = (chunk->addr + align - 1) & ~(align - 1);
 537                 end = (chunk->addr + chunk->size) & ~(align - 1);
 538                 if (start >= end)
 539                         memset(chunk, 0, sizeof(*chunk));
 540                 else {
 541                         chunk->addr = start;
 542                         chunk->size = end - start;
 543                 }
 544         }
 545
 546         for (i = 0; i < MEMORY_CHUNKS; i++) {
 547                 struct mem_chunk *chunk = &memory_chunk[i];
 548
 549                 real_memory_size = max(real_memory_size,
 550                                        chunk->addr + chunk->size);
 551                 if (chunk->addr >= max_mem) {
 552                         memset(chunk, 0, sizeof(*chunk));
 553                         continue;
 554                 }
 555                 if (chunk->addr + chunk->size > max_mem)
 556                         chunk->size = max_mem - chunk->addr;
 557                 memory_size = max(memory_size, chunk->addr + chunk->size);
 558         }
 559         if (!memory_end)
 560                 memory_end = memory_size;
 561 }
 562
 563 static void __init
 564 setup_memory(void)
 565 {
 566         unsigned long bootmap_size;
 567         unsigned long start_pfn, end_pfn;
 568         int i;
 569
 570         /*
 571          * partially used pages are not usable - thus
 572          * we are rounding upwards:
 573          */
 574         start_pfn = PFN_UP(__pa(&_end));
 575         end_pfn = max_pfn = PFN_DOWN(memory_end);
 576
 577 #ifdef CONFIG_BLK_DEV_INITRD
 578         /*
 579          * Move the initrd in case the bitmap of the bootmem allocater
 580          * would overwrite it.
 581          */
 582
 583         if (INITRD_START && INITRD_SIZE) {
 584                 unsigned long bmap_size;
 585                 unsigned long start;
 586
 587                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 588                 bmap_size = PFN_PHYS(bmap_size);
 589
 590                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 591                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 592
 593                         if (start + INITRD_SIZE > memory_end) {
 594                                 pr_err("initrd extends beyond end of "
 595                                        "memory (0x%08lx > 0x%08lx) "
 596                                        "disabling initrd\n",
 597                                        start + INITRD_SIZE, memory_end);
 598                                 INITRD_START = INITRD_SIZE = 0;
 599                         } else {
 600                                 pr_info("Moving initrd (0x%08lx -> "
 601                                         "0x%08lx, size: %ld)\n",
 602                                         INITRD_START, start, INITRD_SIZE);
 603                                 memmove((void *) start, (void *) INITRD_START,
 604                                         INITRD_SIZE);
 605                                 INITRD_START = start;
 606                         }
 607                 }
 608         }
 609 #endif
 610
 611         /*
 612          * Initialize the boot-time allocator
 613          */
 614         bootmap_size = init_bootmem(start_pfn, end_pfn);
 615
 616         /*
 617          * Register RAM areas with the bootmem allocator.
 618          */
 619
 620         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 621                 unsigned long start_chunk, end_chunk, pfn;
 622
 623                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 624                         continue;
 625                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 626                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 627                 end_chunk = min(end_chunk, end_pfn);
 628                 if (start_chunk >= end_chunk)
 629                         continue;
 630                 add_active_range(0, start_chunk, end_chunk);
 631                 pfn = max(start_chunk, start_pfn);
 632                 for (; pfn < end_chunk; pfn++)
 633                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 634         }
 635
 636         psw_set_key(PAGE_DEFAULT_KEY);
 637
 638         free_bootmem_with_active_regions(0, max_pfn);
 639
 640         /*
 641          * Reserve memory used for lowcore/command line/kernel image.
 642          */
 643         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 644         reserve_bootmem((unsigned long)_stext,
 645                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 646                         BOOTMEM_DEFAULT);
 647         /*
 648          * Reserve the bootmem bitmap itself as well. We do this in two
 649          * steps (first step was init_bootmem()) because this catches
 650          * the (very unlikely) case of us accidentally initializing the
 651          * bootmem allocator with an invalid RAM area.
 652          */
 653         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 654                         BOOTMEM_DEFAULT);
 655
 656 #ifdef CONFIG_BLK_DEV_INITRD
 657         if (INITRD_START && INITRD_SIZE) {
 658                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 659                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 660                                         BOOTMEM_DEFAULT);
 661                         initrd_start = INITRD_START;
 662                         initrd_end = initrd_start + INITRD_SIZE;
 663                 } else {
 664                         pr_err("initrd extends beyond end of "
 665                                "memory (0x%08lx > 0x%08lx) "
 666                                "disabling initrd\n",
 667                                initrd_start + INITRD_SIZE, memory_end);
 668                         initrd_start = initrd_end = 0;
 669                 }
 670         }
 671 #endif
 672 }
 673
 674 /*
 675  * Setup hardware capabilities.
 676  */
 677 static void __init setup_hwcaps(void)
 678 {
 679         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 680         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 681         unsigned long long facility_list_extended;
 682         unsigned int facility_list;
 683         int i;
 684
 685         facility_list = stfl();
 686         /*
 687          * The store facility list bits numbers as found in the principles
 688          * of operation are numbered with bit 1UL<<31 as number 0 to
 689          * bit 1UL<<0 as number 31.
 690          *   Bit 0: instructions named N3, "backported" to esa-mode
 691          *   Bit 2: z/Architecture mode is active
 692          *   Bit 7: the store-facility-list-extended facility is installed
 693          *   Bit 17: the message-security assist is installed
 694          *   Bit 19: the long-displacement facility is installed
 695          *   Bit 21: the extended-immediate facility is installed
 696          * These get translated to:
 697          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 698          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 699          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 700          */
 701         for (i = 0; i < 6; i++)
 702                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 703                         elf_hwcap |= 1UL << i;
 704
 705         /*
 706          * Check for additional facilities with store-facility-list-extended.
 707          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 708          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 709          * as stored by stfl, bits 32-xxx contain additional facilities.
 710          * How many facility words are stored depends on the number of
 711          * doublewords passed to the instruction. The additional facilites
 712          * are:
 713          *   Bit 43: decimal floating point facility is installed
 714          * translated to:
 715          *   HWCAP_S390_DFP bit 6.
 716          */
 717         if ((elf_hwcap & (1UL << 2)) &&
 718             __stfle(&facility_list_extended, 1) > 0) {
 719                 if (facility_list_extended & (1ULL << (64 - 43)))
 720                         elf_hwcap |= 1UL << 6;
 721         }
 722
 723         if (MACHINE_HAS_HPAGE)
 724                 elf_hwcap |= 1UL << 7;
 725
 726         switch (cpuinfo->cpu_id.machine) {
 727         case 0x9672:
 728 #if !defined(CONFIG_64BIT)
 729         default:        /* Use "g5" as default for 31 bit kernels. */
 730 #endif
 731                 strcpy(elf_platform, "g5");
 732                 break;
 733         case 0x2064:
 734         case 0x2066:
 735 #if defined(CONFIG_64BIT)
 736         default:        /* Use "z900" as default for 64 bit kernels. */
 737 #endif
 738                 strcpy(elf_platform, "z900");
 739                 break;
 740         case 0x2084:
 741         case 0x2086:
 742                 strcpy(elf_platform, "z990");
 743                 break;
 744         case 0x2094:
 745         case 0x2096:
 746                 strcpy(elf_platform, "z9-109");
 747                 break;
 748         case 0x2097:
 749         case 0x2098:
 750                 strcpy(elf_platform, "z10");
 751                 break;
 752         }
 753 }
 754
 755 /*
 756  * Setup function called from init/main.c just after the banner
 757  * was printed.
 758  */
 759
 760 void __init
 761 setup_arch(char **cmdline_p)
 762 {
 763         /* set up preferred console */
 764         add_preferred_console("ttyS", 0, NULL);
 765
 766         /*
 767          * print what head.S has found out about the machine
 768          */
 769 #ifndef CONFIG_64BIT
 770         if (MACHINE_IS_VM)
 771                 pr_info("Linux is running as a z/VM "
 772                         "guest operating system in 31-bit mode\n");
 773         else
 774                 pr_info("Linux is running natively in 31-bit mode\n");
 775         if (MACHINE_HAS_IEEE)
 776                 pr_info("The hardware system has IEEE compatible "
 777                         "floating point units\n");
 778         else
 779                 pr_info("The hardware system has no IEEE compatible "
 780                         "floating point units\n");
 781 #else /* CONFIG_64BIT */
 782         if (MACHINE_IS_VM)
 783                 pr_info("Linux is running as a z/VM "
 784                         "guest operating system in 64-bit mode\n");
 785         else if (MACHINE_IS_KVM) {
 786                 pr_info("Linux is running under KVM in 64-bit mode\n");
 787                 add_preferred_console("hvc", 0, NULL);
 788                 s390_virtio_console_init();
 789         } else
 790                 pr_info("Linux is running natively in 64-bit mode\n");
 791 #endif /* CONFIG_64BIT */
 792
 793         /* Have one command line that is parsed and saved in /proc/cmdline */
 794         /* boot_command_line has been already set up in early.c */
 795         *cmdline_p = boot_command_line;
 796
 797         ROOT_DEV = Root_RAM0;
 798
 799         init_mm.start_code = PAGE_OFFSET;
 800         init_mm.end_code = (unsigned long) &_etext;
 801         init_mm.end_data = (unsigned long) &_edata;
 802         init_mm.brk = (unsigned long) &_end;
 803
 804         if (MACHINE_HAS_MVCOS)
 805                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 806         else
 807                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 808
 809         parse_early_param();
 810
 811         setup_ipl();
 812         setup_memory_end();
 813         setup_addressing_mode();
 814         setup_memory();
 815         setup_resources();
 816         setup_lowcore();
 817
 818         cpu_init();
 819         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 820         s390_init_cpu_topology();
 821
 822         /*
 823          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 824          */
 825         setup_hwcaps();
 826
 827         /*
 828          * Create kernel page tables and switch to virtual addressing.
 829          */
 830         paging_init();
 831
 832         /* Setup default console */
 833         conmode_default();
 834
 835         /* Setup zfcpdump support */
 836         setup_zfcpdump(console_devno);
 837 }