arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/tty.h>
  28 #include <linux/ioport.h>
  29 #include <linux/delay.h>
  30 #include <linux/init.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/root_dev.h>
  34 #include <linux/console.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/kernel_stat.h>
  37 #include <linux/device.h>
  38 #include <linux/notifier.h>
  39 #include <linux/pfn.h>
  40 #include <linux/ctype.h>
  41 #include <linux/reboot.h>
  42 #include <linux/topology.h>
  43
  44 #include <asm/ipl.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/system.h>
  47 #include <asm/smp.h>
  48 #include <asm/mmu_context.h>
  49 #include <asm/cpcmd.h>
  50 #include <asm/lowcore.h>
  51 #include <asm/irq.h>
  52 #include <asm/page.h>
  53 #include <asm/ptrace.h>
  54 #include <asm/sections.h>
  55 #include <asm/ebcdic.h>
  56 #include <asm/compat.h>
  57
  58 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  59                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  60 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  61                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  62                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  63
  64 /*
  65  * User copy operations.
  66  */
  67 struct uaccess_ops uaccess;
  68 EXPORT_SYMBOL(uaccess);
  69
  70 /*
  71  * Machine setup..
  72  */
  73 unsigned int console_mode = 0;
  74 unsigned int console_devno = -1;
  75 unsigned int console_irq = -1;
  76 unsigned long machine_flags;
  77 unsigned long elf_hwcap = 0;
  78 char elf_platform[ELF_PLATFORM_SIZE];
  79
  80 struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS];
  81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  82 static unsigned long __initdata memory_end;
  83
  84 /*
  85  * This is set up by the setup-routine at boot-time
  86  * for S390 need to find out, what we have to setup
  87  * using address 0x10400 ...
  88  */
  89
  90 #include <asm/setup.h>
  91
  92 static struct resource code_resource = {
  93         .name  = "Kernel code",
  94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  95 };
  96
  97 static struct resource data_resource = {
  98         .name = "Kernel data",
  99         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 100 };
 101
 102 /*
 103  * cpu_init() initializes state that is per-CPU.
 104  */
 105 void __cpuinit cpu_init(void)
 106 {
 107         int addr = hard_smp_processor_id();
 108
 109         /*
 110          * Store processor id in lowcore (used e.g. in timer_interrupt)
 111          */
 112         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 113         S390_lowcore.cpu_data.cpu_addr = addr;
 114
 115         /*
 116          * Force FPU initialization:
 117          */
 118         clear_thread_flag(TIF_USEDFPU);
 119         clear_used_math();
 120
 121         atomic_inc(&init_mm.mm_count);
 122         current->active_mm = &init_mm;
 123         if (current->mm)
 124                 BUG();
 125         enter_lazy_tlb(&init_mm, current);
 126 }
 127
 128 /*
 129  * condev= and conmode= setup parameter.
 130  */
 131
 132 static int __init condev_setup(char *str)
 133 {
 134         int vdev;
 135
 136         vdev = simple_strtoul(str, &str, 0);
 137         if (vdev >= 0 && vdev < 65536) {
 138                 console_devno = vdev;
 139                 console_irq = -1;
 140         }
 141         return 1;
 142 }
 143
 144 __setup("condev=", condev_setup);
 145
 146 static int __init conmode_setup(char *str)
 147 {
 148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 149         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 150                 SET_CONSOLE_SCLP;
 151 #endif
 152 #if defined(CONFIG_TN3215_CONSOLE)
 153         if (strncmp(str, "3215", 5) == 0)
 154                 SET_CONSOLE_3215;
 155 #endif
 156 #if defined(CONFIG_TN3270_CONSOLE)
 157         if (strncmp(str, "3270", 5) == 0)
 158                 SET_CONSOLE_3270;
 159 #endif
 160         return 1;
 161 }
 162
 163 __setup("conmode=", conmode_setup);
 164
 165 static void __init conmode_default(void)
 166 {
 167         char query_buffer[1024];
 168         char *ptr;
 169
 170         if (MACHINE_IS_VM) {
 171                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 172                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 173                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 174                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 175                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 176                 ptr = strstr(query_buffer, "CONMODE");
 177                 /*
 178                  * Set the conmode to 3215 so that the device recognition
 179                  * will set the cu_type of the console to 3215. If the
 180                  * conmode is 3270 and we don't set it back then both
 181                  * 3215 and the 3270 driver will try to access the console
 182                  * device (3215 as console and 3270 as normal tty).
 183                  */
 184                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 185                 if (ptr == NULL) {
 186 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 187                         SET_CONSOLE_SCLP;
 188 #endif
 189                         return;
 190                 }
 191                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 192 #if defined(CONFIG_TN3270_CONSOLE)
 193                         SET_CONSOLE_3270;
 194 #elif defined(CONFIG_TN3215_CONSOLE)
 195                         SET_CONSOLE_3215;
 196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 197                         SET_CONSOLE_SCLP;
 198 #endif
 199                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 200 #if defined(CONFIG_TN3215_CONSOLE)
 201                         SET_CONSOLE_3215;
 202 #elif defined(CONFIG_TN3270_CONSOLE)
 203                         SET_CONSOLE_3270;
 204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 205                         SET_CONSOLE_SCLP;
 206 #endif
 207                 }
 208         } else if (MACHINE_IS_P390) {
 209 #if defined(CONFIG_TN3215_CONSOLE)
 210                 SET_CONSOLE_3215;
 211 #elif defined(CONFIG_TN3270_CONSOLE)
 212                 SET_CONSOLE_3270;
 213 #endif
 214         } else {
 215 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 216                 SET_CONSOLE_SCLP;
 217 #endif
 218         }
 219 }
 220
 221 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 222 static void __init setup_zfcpdump(unsigned int console_devno)
 223 {
 224         static char str[64];
 225
 226         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 227                 return;
 228         if (console_devno != -1)
 229                 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
 230                         ipl_info.data.fcp.dev_id.devno, console_devno);
 231         else
 232                 sprintf(str, "cio_ignore=all,!0.0.%04x",
 233                         ipl_info.data.fcp.dev_id.devno);
 234         strcat(COMMAND_LINE, " ");
 235         strcat(COMMAND_LINE, str);
 236         console_loglevel = 2;
 237 }
 238 #else
 239 static inline void setup_zfcpdump(unsigned int console_devno) {}
 240 #endif /* CONFIG_ZFCPDUMP */
 241
 242  /*
 243  * Reboot, halt and power_off stubs. They just call _machine_restart,
 244  * _machine_halt or _machine_power_off.
 245  */
 246
 247 void machine_restart(char *command)
 248 {
 249         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 250                 /*
 251                  * Only unblank the console if we are called in enabled
 252                  * context or a bust_spinlocks cleared the way for us.
 253                  */
 254                 console_unblank();
 255         _machine_restart(command);
 256 }
 257
 258 void machine_halt(void)
 259 {
 260         if (!in_interrupt() || oops_in_progress)
 261                 /*
 262                  * Only unblank the console if we are called in enabled
 263                  * context or a bust_spinlocks cleared the way for us.
 264                  */
 265                 console_unblank();
 266         _machine_halt();
 267 }
 268
 269 void machine_power_off(void)
 270 {
 271         if (!in_interrupt() || oops_in_progress)
 272                 /*
 273                  * Only unblank the console if we are called in enabled
 274                  * context or a bust_spinlocks cleared the way for us.
 275                  */
 276                 console_unblank();
 277         _machine_power_off();
 278 }
 279
 280 /*
 281  * Dummy power off function.
 282  */
 283 void (*pm_power_off)(void) = machine_power_off;
 284
 285 static int __init early_parse_mem(char *p)
 286 {
 287         memory_end = memparse(p, &p);
 288         return 0;
 289 }
 290 early_param("mem", early_parse_mem);
 291
 292 #ifdef CONFIG_S390_SWITCH_AMODE
 293 #ifdef CONFIG_PGSTE
 294 unsigned int switch_amode = 1;
 295 #else
 296 unsigned int switch_amode = 0;
 297 #endif
 298 EXPORT_SYMBOL_GPL(switch_amode);
 299
 300 static void set_amode_and_uaccess(unsigned long user_amode,
 301                                   unsigned long user32_amode)
 302 {
 303         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 304                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 305                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 306 #ifdef CONFIG_COMPAT
 307         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 308                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 309                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 310         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 311                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 312                           PSW32_MASK_PSTATE;
 313 #endif
 314         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 315                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 316
 317         if (MACHINE_HAS_MVCOS) {
 318                 printk("mvcos available.\n");
 319                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 320         } else {
 321                 printk("mvcos not available.\n");
 322                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 323         }
 324 }
 325
 326 /*
 327  * Switch kernel/user addressing modes?
 328  */
 329 static int __init early_parse_switch_amode(char *p)
 330 {
 331         switch_amode = 1;
 332         return 0;
 333 }
 334 early_param("switch_amode", early_parse_switch_amode);
 335
 336 #else /* CONFIG_S390_SWITCH_AMODE */
 337 static inline void set_amode_and_uaccess(unsigned long user_amode,
 338                                          unsigned long user32_amode)
 339 {
 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                 printk("S390 execute protection active, ");
 365                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 366         } else if (switch_amode) {
 367                 printk("S390 address spaces switched, ");
 368                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 369         }
 370 #ifdef CONFIG_TRACE_IRQFLAGS
 371         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 372         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 373 #endif
 374 }
 375
 376 static void __init
 377 setup_lowcore(void)
 378 {
 379         struct _lowcore *lc;
 380         int lc_pages;
 381
 382         /*
 383          * Setup lowcore for boot cpu
 384          */
 385         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 386         lc = (struct _lowcore *)
 387                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 388         memset(lc, 0, lc_pages * PAGE_SIZE);
 389         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 390         lc->restart_psw.addr =
 391                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 392         if (switch_amode)
 393                 lc->restart_psw.mask |= PSW_ASC_HOME;
 394         lc->external_new_psw.mask = psw_kernel_bits;
 395         lc->external_new_psw.addr =
 396                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 397         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 398         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 399         lc->program_new_psw.mask = psw_kernel_bits;
 400         lc->program_new_psw.addr =
 401                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 402         lc->mcck_new_psw.mask =
 403                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 404         lc->mcck_new_psw.addr =
 405                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 406         lc->io_new_psw.mask = psw_kernel_bits;
 407         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 408         lc->ipl_device = S390_lowcore.ipl_device;
 409         lc->clock_comparator = -1ULL;
 410         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 411         lc->async_stack = (unsigned long)
 412                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 413         lc->panic_stack = (unsigned long)
 414                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 415         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 416         lc->thread_info = (unsigned long) &init_thread_union;
 417 #ifndef CONFIG_64BIT
 418         if (MACHINE_HAS_IEEE) {
 419                 lc->extended_save_area_addr = (__u32)
 420                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 421                 /* enable extended save area */
 422                 __ctl_set_bit(14, 29);
 423         }
 424 #endif
 425         set_prefix((u32)(unsigned long) lc);
 426 }
 427
 428 static void __init
 429 setup_resources(void)
 430 {
 431         struct resource *res, *sub_res;
 432         int i;
 433
 434         code_resource.start = (unsigned long) &_text;
 435         code_resource.end = (unsigned long) &_etext - 1;
 436         data_resource.start = (unsigned long) &_etext;
 437         data_resource.end = (unsigned long) &_edata - 1;
 438
 439         for (i = 0; i < MEMORY_CHUNKS; i++) {
 440                 if (!memory_chunk[i].size)
 441                         continue;
 442                 res = alloc_bootmem_low(sizeof(struct resource));
 443                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 444                 switch (memory_chunk[i].type) {
 445                 case CHUNK_READ_WRITE:
 446                         res->name = "System RAM";
 447                         break;
 448                 case CHUNK_READ_ONLY:
 449                         res->name = "System ROM";
 450                         res->flags |= IORESOURCE_READONLY;
 451                         break;
 452                 default:
 453                         res->name = "reserved";
 454                 }
 455                 res->start = memory_chunk[i].addr;
 456                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 457                 request_resource(&iomem_resource, res);
 458
 459                 if (code_resource.start >= res->start  &&
 460                         code_resource.start <= res->end &&
 461                         code_resource.end > res->end) {
 462                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 463                         memcpy(sub_res, &code_resource,
 464                                 sizeof(struct resource));
 465                         sub_res->end = res->end;
 466                         code_resource.start = res->end + 1;
 467                         request_resource(res, sub_res);
 468                 }
 469
 470                 if (code_resource.start >= res->start &&
 471                         code_resource.start <= res->end &&
 472                         code_resource.end <= res->end)
 473                         request_resource(res, &code_resource);
 474
 475                 if (data_resource.start >= res->start &&
 476                         data_resource.start <= res->end &&
 477                         data_resource.end > res->end) {
 478                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 479                         memcpy(sub_res, &data_resource,
 480                                 sizeof(struct resource));
 481                         sub_res->end = res->end;
 482                         data_resource.start = res->end + 1;
 483                         request_resource(res, sub_res);
 484                 }
 485
 486                 if (data_resource.start >= res->start &&
 487                         data_resource.start <= res->end &&
 488                         data_resource.end <= res->end)
 489                         request_resource(res, &data_resource);
 490         }
 491 }
 492
 493 unsigned long real_memory_size;
 494 EXPORT_SYMBOL_GPL(real_memory_size);
 495
 496 static void __init setup_memory_end(void)
 497 {
 498         unsigned long memory_size;
 499         unsigned long max_mem;
 500         int i;
 501
 502 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 503         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 504                 memory_end = ZFCPDUMP_HSA_SIZE;
 505 #endif
 506         memory_size = 0;
 507         memory_end &= PAGE_MASK;
 508
 509         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 510         memory_end = min(max_mem, memory_end);
 511
 512         /*
 513          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 514          * extra checks that HOLES_IN_ZONE would require.
 515          */
 516         for (i = 0; i < MEMORY_CHUNKS; i++) {
 517                 unsigned long start, end;
 518                 struct mem_chunk *chunk;
 519                 unsigned long align;
 520
 521                 chunk = &memory_chunk[i];
 522                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 523                 start = (chunk->addr + align - 1) & ~(align - 1);
 524                 end = (chunk->addr + chunk->size) & ~(align - 1);
 525                 if (start >= end)
 526                         memset(chunk, 0, sizeof(*chunk));
 527                 else {
 528                         chunk->addr = start;
 529                         chunk->size = end - start;
 530                 }
 531         }
 532
 533         for (i = 0; i < MEMORY_CHUNKS; i++) {
 534                 struct mem_chunk *chunk = &memory_chunk[i];
 535
 536                 real_memory_size = max(real_memory_size,
 537                                        chunk->addr + chunk->size);
 538                 if (chunk->addr >= max_mem) {
 539                         memset(chunk, 0, sizeof(*chunk));
 540                         continue;
 541                 }
 542                 if (chunk->addr + chunk->size > max_mem)
 543                         chunk->size = max_mem - chunk->addr;
 544                 memory_size = max(memory_size, chunk->addr + chunk->size);
 545         }
 546         if (!memory_end)
 547                 memory_end = memory_size;
 548 }
 549
 550 static void __init
 551 setup_memory(void)
 552 {
 553         unsigned long bootmap_size;
 554         unsigned long start_pfn, end_pfn;
 555         int i;
 556
 557         /*
 558          * partially used pages are not usable - thus
 559          * we are rounding upwards:
 560          */
 561         start_pfn = PFN_UP(__pa(&_end));
 562         end_pfn = max_pfn = PFN_DOWN(memory_end);
 563
 564 #ifdef CONFIG_BLK_DEV_INITRD
 565         /*
 566          * Move the initrd in case the bitmap of the bootmem allocater
 567          * would overwrite it.
 568          */
 569
 570         if (INITRD_START && INITRD_SIZE) {
 571                 unsigned long bmap_size;
 572                 unsigned long start;
 573
 574                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 575                 bmap_size = PFN_PHYS(bmap_size);
 576
 577                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 578                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 579
 580                         if (start + INITRD_SIZE > memory_end) {
 581                                 printk("initrd extends beyond end of memory "
 582                                        "(0x%08lx > 0x%08lx)\n"
 583                                        "disabling initrd\n",
 584                                        start + INITRD_SIZE, memory_end);
 585                                 INITRD_START = INITRD_SIZE = 0;
 586                         } else {
 587                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 588                                        "size: %ld)\n",
 589                                        INITRD_START, start, INITRD_SIZE);
 590                                 memmove((void *) start, (void *) INITRD_START,
 591                                         INITRD_SIZE);
 592                                 INITRD_START = start;
 593                         }
 594                 }
 595         }
 596 #endif
 597
 598         /*
 599          * Initialize the boot-time allocator
 600          */
 601         bootmap_size = init_bootmem(start_pfn, end_pfn);
 602
 603         /*
 604          * Register RAM areas with the bootmem allocator.
 605          */
 606
 607         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 608                 unsigned long start_chunk, end_chunk, pfn;
 609
 610                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 611                         continue;
 612                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 613                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 614                 end_chunk = min(end_chunk, end_pfn);
 615                 if (start_chunk >= end_chunk)
 616                         continue;
 617                 add_active_range(0, start_chunk, end_chunk);
 618                 pfn = max(start_chunk, start_pfn);
 619                 for (; pfn <= end_chunk; pfn++)
 620                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 621         }
 622
 623         psw_set_key(PAGE_DEFAULT_KEY);
 624
 625         free_bootmem_with_active_regions(0, max_pfn);
 626
 627         /*
 628          * Reserve memory used for lowcore/command line/kernel image.
 629          */
 630         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 631         reserve_bootmem((unsigned long)_stext,
 632                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 633                         BOOTMEM_DEFAULT);
 634         /*
 635          * Reserve the bootmem bitmap itself as well. We do this in two
 636          * steps (first step was init_bootmem()) because this catches
 637          * the (very unlikely) case of us accidentally initializing the
 638          * bootmem allocator with an invalid RAM area.
 639          */
 640         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 641                         BOOTMEM_DEFAULT);
 642
 643 #ifdef CONFIG_BLK_DEV_INITRD
 644         if (INITRD_START && INITRD_SIZE) {
 645                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 646                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 647                                         BOOTMEM_DEFAULT);
 648                         initrd_start = INITRD_START;
 649                         initrd_end = initrd_start + INITRD_SIZE;
 650                 } else {
 651                         printk("initrd extends beyond end of memory "
 652                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 653                                initrd_start + INITRD_SIZE, memory_end);
 654                         initrd_start = initrd_end = 0;
 655                 }
 656         }
 657 #endif
 658 }
 659
 660 static int __init __stfle(unsigned long long *list, int doublewords)
 661 {
 662         typedef struct { unsigned long long _[doublewords]; } addrtype;
 663         register unsigned long __nr asm("0") = doublewords - 1;
 664
 665         asm volatile(".insn s,0xb2b00000,%0" /* stfle */
 666                      : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
 667         return __nr + 1;
 668 }
 669
 670 int __init stfle(unsigned long long *list, int doublewords)
 671 {
 672         if (!(stfl() & (1UL << 24)))
 673                 return -EOPNOTSUPP;
 674         return __stfle(list, doublewords);
 675 }
 676
 677 /*
 678  * Setup hardware capabilities.
 679  */
 680 static void __init setup_hwcaps(void)
 681 {
 682         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 683         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 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 (cpuinfo->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                 strcpy(elf_platform, "z9-109");
 749                 break;
 750         }
 751 }
 752
 753 /*
 754  * Setup function called from init/main.c just after the banner
 755  * was printed.
 756  */
 757
 758 void __init
 759 setup_arch(char **cmdline_p)
 760 {
 761         /*
 762          * print what head.S has found out about the machine
 763          */
 764 #ifndef CONFIG_64BIT
 765         printk((MACHINE_IS_VM) ?
 766                "We are running under VM (31 bit mode)\n" :
 767                "We are running native (31 bit mode)\n");
 768         printk((MACHINE_HAS_IEEE) ?
 769                "This machine has an IEEE fpu\n" :
 770                "This machine has no IEEE fpu\n");
 771 #else /* CONFIG_64BIT */
 772         if (MACHINE_IS_VM)
 773                 printk("We are running under VM (64 bit mode)\n");
 774         else if (MACHINE_IS_KVM) {
 775                 printk("We are running under KVM (64 bit mode)\n");
 776                 add_preferred_console("ttyS", 1, NULL);
 777         } else
 778                 printk("We are running native (64 bit mode)\n");
 779 #endif /* CONFIG_64BIT */
 780
 781         /* Save unparsed command line copy for /proc/cmdline */
 782         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 783
 784         *cmdline_p = COMMAND_LINE;
 785         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 786
 787         ROOT_DEV = Root_RAM0;
 788
 789         init_mm.start_code = PAGE_OFFSET;
 790         init_mm.end_code = (unsigned long) &_etext;
 791         init_mm.end_data = (unsigned long) &_edata;
 792         init_mm.brk = (unsigned long) &_end;
 793
 794         if (MACHINE_HAS_MVCOS)
 795                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 796         else
 797                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 798
 799         parse_early_param();
 800
 801         setup_ipl();
 802         setup_memory_end();
 803         setup_addressing_mode();
 804         setup_memory();
 805         setup_resources();
 806         setup_lowcore();
 807
 808         cpu_init();
 809         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 810         s390_init_cpu_topology();
 811
 812         /*
 813          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 814          */
 815         setup_hwcaps();
 816
 817         /*
 818          * Create kernel page tables and switch to virtual addressing.
 819          */
 820         paging_init();
 821
 822         /* Setup default console */
 823         conmode_default();
 824
 825         /* Setup zfcpdump support */
 826         setup_zfcpdump(console_devno);
 827 }
 828
 829 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 830 {
 831    printk(KERN_INFO "cpu %d "
 832 #ifdef CONFIG_SMP
 833            "phys_idx=%d "
 834 #endif
 835            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 836            cpuinfo->cpu_nr,
 837 #ifdef CONFIG_SMP
 838            cpuinfo->cpu_addr,
 839 #endif
 840            cpuinfo->cpu_id.version,
 841            cpuinfo->cpu_id.ident,
 842            cpuinfo->cpu_id.machine,
 843            cpuinfo->cpu_id.unused);
 844 }
 845
 846 /*
 847  * show_cpuinfo - Get information on one CPU for use by procfs.
 848  */
 849
 850 static int show_cpuinfo(struct seq_file *m, void *v)
 851 {
 852         static const char *hwcap_str[8] = {
 853                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 854                 "edat"
 855         };
 856         struct cpuinfo_S390 *cpuinfo;
 857         unsigned long n = (unsigned long) v - 1;
 858         int i;
 859
 860         s390_adjust_jiffies();
 861         preempt_disable();
 862         if (!n) {
 863                 seq_printf(m, "vendor_id       : IBM/S390\n"
 864                                "# processors    : %i\n"
 865                                "bogomips per cpu: %lu.%02lu\n",
 866                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 867                                (loops_per_jiffy/(5000/HZ))%100);
 868                 seq_puts(m, "features\t: ");
 869                 for (i = 0; i < 8; i++)
 870                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 871                                 seq_printf(m, "%s ", hwcap_str[i]);
 872                 seq_puts(m, "\n");
 873         }
 874
 875         if (cpu_online(n)) {
 876 #ifdef CONFIG_SMP
 877                 if (smp_processor_id() == n)
 878                         cpuinfo = &S390_lowcore.cpu_data;
 879                 else
 880                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 881 #else
 882                 cpuinfo = &S390_lowcore.cpu_data;
 883 #endif
 884                 seq_printf(m, "processor %li: "
 885                                "version = %02X,  "
 886                                "identification = %06X,  "
 887                                "machine = %04X\n",
 888                                n, cpuinfo->cpu_id.version,
 889                                cpuinfo->cpu_id.ident,
 890                                cpuinfo->cpu_id.machine);
 891         }
 892         preempt_enable();
 893         return 0;
 894 }
 895
 896 static void *c_start(struct seq_file *m, loff_t *pos)
 897 {
 898         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 899 }
 900 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 901 {
 902         ++*pos;
 903         return c_start(m, pos);
 904 }
 905 static void c_stop(struct seq_file *m, void *v)
 906 {
 907 }
 908 const struct seq_operations cpuinfo_op = {
 909         .start  = c_start,
 910         .next   = c_next,
 911         .stop   = c_stop,
 912         .show   = show_cpuinfo,
 913 };
 914