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
  43 #include <asm/ipl.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/system.h>
  46 #include <asm/smp.h>
  47 #include <asm/mmu_context.h>
  48 #include <asm/cpcmd.h>
  49 #include <asm/lowcore.h>
  50 #include <asm/irq.h>
  51 #include <asm/page.h>
  52 #include <asm/ptrace.h>
  53 #include <asm/sections.h>
  54 #include <asm/ebcdic.h>
  55 #include <asm/compat.h>
  56
  57 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  58                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  59 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  60                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  61                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  62
  63 /*
  64  * User copy operations.
  65  */
  66 struct uaccess_ops uaccess;
  67 EXPORT_SYMBOL(uaccess);
  68
  69 /*
  70  * Machine setup..
  71  */
  72 unsigned int console_mode = 0;
  73 unsigned int console_devno = -1;
  74 unsigned int console_irq = -1;
  75 unsigned long machine_flags = 0;
  76 unsigned long elf_hwcap = 0;
  77 char elf_platform[ELF_PLATFORM_SIZE];
  78
  79 struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS];
  80 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  81 static unsigned long __initdata memory_end;
  82
  83 /*
  84  * This is set up by the setup-routine at boot-time
  85  * for S390 need to find out, what we have to setup
  86  * using address 0x10400 ...
  87  */
  88
  89 #include <asm/setup.h>
  90
  91 static struct resource code_resource = {
  92         .name  = "Kernel code",
  93         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  94 };
  95
  96 static struct resource data_resource = {
  97         .name = "Kernel data",
  98         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  99 };
 100
 101 /*
 102  * cpu_init() initializes state that is per-CPU.
 103  */
 104 void __cpuinit cpu_init(void)
 105 {
 106         int addr = hard_smp_processor_id();
 107
 108         /*
 109          * Store processor id in lowcore (used e.g. in timer_interrupt)
 110          */
 111         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 112         S390_lowcore.cpu_data.cpu_addr = addr;
 113
 114         /*
 115          * Force FPU initialization:
 116          */
 117         clear_thread_flag(TIF_USEDFPU);
 118         clear_used_math();
 119
 120         atomic_inc(&init_mm.mm_count);
 121         current->active_mm = &init_mm;
 122         if (current->mm)
 123                 BUG();
 124         enter_lazy_tlb(&init_mm, current);
 125 }
 126
 127 /*
 128  * condev= and conmode= setup parameter.
 129  */
 130
 131 static int __init condev_setup(char *str)
 132 {
 133         int vdev;
 134
 135         vdev = simple_strtoul(str, &str, 0);
 136         if (vdev >= 0 && vdev < 65536) {
 137                 console_devno = vdev;
 138                 console_irq = -1;
 139         }
 140         return 1;
 141 }
 142
 143 __setup("condev=", condev_setup);
 144
 145 static int __init conmode_setup(char *str)
 146 {
 147 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 148         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 149                 SET_CONSOLE_SCLP;
 150 #endif
 151 #if defined(CONFIG_TN3215_CONSOLE)
 152         if (strncmp(str, "3215", 5) == 0)
 153                 SET_CONSOLE_3215;
 154 #endif
 155 #if defined(CONFIG_TN3270_CONSOLE)
 156         if (strncmp(str, "3270", 5) == 0)
 157                 SET_CONSOLE_3270;
 158 #endif
 159         return 1;
 160 }
 161
 162 __setup("conmode=", conmode_setup);
 163
 164 static void __init conmode_default(void)
 165 {
 166         char query_buffer[1024];
 167         char *ptr;
 168
 169         if (MACHINE_IS_VM) {
 170                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 171                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 172                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 173                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 174                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 175                 ptr = strstr(query_buffer, "CONMODE");
 176                 /*
 177                  * Set the conmode to 3215 so that the device recognition
 178                  * will set the cu_type of the console to 3215. If the
 179                  * conmode is 3270 and we don't set it back then both
 180                  * 3215 and the 3270 driver will try to access the console
 181                  * device (3215 as console and 3270 as normal tty).
 182                  */
 183                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 184                 if (ptr == NULL) {
 185 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 186                         SET_CONSOLE_SCLP;
 187 #endif
 188                         return;
 189                 }
 190                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 191 #if defined(CONFIG_TN3270_CONSOLE)
 192                         SET_CONSOLE_3270;
 193 #elif defined(CONFIG_TN3215_CONSOLE)
 194                         SET_CONSOLE_3215;
 195 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 196                         SET_CONSOLE_SCLP;
 197 #endif
 198                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 199 #if defined(CONFIG_TN3215_CONSOLE)
 200                         SET_CONSOLE_3215;
 201 #elif defined(CONFIG_TN3270_CONSOLE)
 202                         SET_CONSOLE_3270;
 203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 204                         SET_CONSOLE_SCLP;
 205 #endif
 206                 }
 207         } else if (MACHINE_IS_P390) {
 208 #if defined(CONFIG_TN3215_CONSOLE)
 209                 SET_CONSOLE_3215;
 210 #elif defined(CONFIG_TN3270_CONSOLE)
 211                 SET_CONSOLE_3270;
 212 #endif
 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[64];
 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(COMMAND_LINE, " ");
 234         strcat(COMMAND_LINE, str);
 235         console_loglevel = 2;
 236 }
 237 #else
 238 static inline void setup_zfcpdump(unsigned int console_devno) {}
 239 #endif /* CONFIG_ZFCPDUMP */
 240
 241  /*
 242  * Reboot, halt and power_off stubs. They just call _machine_restart,
 243  * _machine_halt or _machine_power_off.
 244  */
 245
 246 void machine_restart(char *command)
 247 {
 248         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 249                 /*
 250                  * Only unblank the console if we are called in enabled
 251                  * context or a bust_spinlocks cleared the way for us.
 252                  */
 253                 console_unblank();
 254         _machine_restart(command);
 255 }
 256
 257 void machine_halt(void)
 258 {
 259         if (!in_interrupt() || oops_in_progress)
 260                 /*
 261                  * Only unblank the console if we are called in enabled
 262                  * context or a bust_spinlocks cleared the way for us.
 263                  */
 264                 console_unblank();
 265         _machine_halt();
 266 }
 267
 268 void machine_power_off(void)
 269 {
 270         if (!in_interrupt() || oops_in_progress)
 271                 /*
 272                  * Only unblank the console if we are called in enabled
 273                  * context or a bust_spinlocks cleared the way for us.
 274                  */
 275                 console_unblank();
 276         _machine_power_off();
 277 }
 278
 279 /*
 280  * Dummy power off function.
 281  */
 282 void (*pm_power_off)(void) = machine_power_off;
 283
 284 static int __init early_parse_mem(char *p)
 285 {
 286         memory_end = memparse(p, &p);
 287         return 0;
 288 }
 289 early_param("mem", early_parse_mem);
 290
 291 /*
 292  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 293  */
 294 static int __init early_parse_ipldelay(char *p)
 295 {
 296         unsigned long delay = 0;
 297
 298         delay = simple_strtoul(p, &p, 0);
 299
 300         switch (*p) {
 301         case 's':
 302         case 'S':
 303                 delay *= 1000000;
 304                 break;
 305         case 'm':
 306         case 'M':
 307                 delay *= 60 * 1000000;
 308         }
 309
 310         /* now wait for the requested amount of time */
 311         udelay(delay);
 312
 313         return 0;
 314 }
 315 early_param("ipldelay", early_parse_ipldelay);
 316
 317 #ifdef CONFIG_S390_SWITCH_AMODE
 318 unsigned int switch_amode = 0;
 319 EXPORT_SYMBOL_GPL(switch_amode);
 320
 321 static void set_amode_and_uaccess(unsigned long user_amode,
 322                                   unsigned long user32_amode)
 323 {
 324         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 325                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 326                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 327 #ifdef CONFIG_COMPAT
 328         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 329                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 330                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 331         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 332                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 333                           PSW32_MASK_PSTATE;
 334 #endif
 335         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 336                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 337
 338         if (MACHINE_HAS_MVCOS) {
 339                 printk("mvcos available.\n");
 340                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 341         } else {
 342                 printk("mvcos not available.\n");
 343                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 344         }
 345 }
 346
 347 /*
 348  * Switch kernel/user addressing modes?
 349  */
 350 static int __init early_parse_switch_amode(char *p)
 351 {
 352         switch_amode = 1;
 353         return 0;
 354 }
 355 early_param("switch_amode", early_parse_switch_amode);
 356
 357 #else /* CONFIG_S390_SWITCH_AMODE */
 358 static inline void set_amode_and_uaccess(unsigned long user_amode,
 359                                          unsigned long user32_amode)
 360 {
 361 }
 362 #endif /* CONFIG_S390_SWITCH_AMODE */
 363
 364 #ifdef CONFIG_S390_EXEC_PROTECT
 365 unsigned int s390_noexec = 0;
 366 EXPORT_SYMBOL_GPL(s390_noexec);
 367
 368 /*
 369  * Enable execute protection?
 370  */
 371 static int __init early_parse_noexec(char *p)
 372 {
 373         if (!strncmp(p, "off", 3))
 374                 return 0;
 375         switch_amode = 1;
 376         s390_noexec = 1;
 377         return 0;
 378 }
 379 early_param("noexec", early_parse_noexec);
 380 #endif /* CONFIG_S390_EXEC_PROTECT */
 381
 382 static void setup_addressing_mode(void)
 383 {
 384         if (s390_noexec) {
 385                 printk("S390 execute protection active, ");
 386                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 387         } else if (switch_amode) {
 388                 printk("S390 address spaces switched, ");
 389                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 390         }
 391 #ifdef CONFIG_TRACE_IRQFLAGS
 392         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 393         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 394 #endif
 395 }
 396
 397 static void __init
 398 setup_lowcore(void)
 399 {
 400         struct _lowcore *lc;
 401         int lc_pages;
 402
 403         /*
 404          * Setup lowcore for boot cpu
 405          */
 406         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 407         lc = (struct _lowcore *)
 408                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 409         memset(lc, 0, lc_pages * PAGE_SIZE);
 410         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 411         lc->restart_psw.addr =
 412                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 413         if (switch_amode)
 414                 lc->restart_psw.mask |= PSW_ASC_HOME;
 415         lc->external_new_psw.mask = psw_kernel_bits;
 416         lc->external_new_psw.addr =
 417                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 418         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 419         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 420         lc->program_new_psw.mask = psw_kernel_bits;
 421         lc->program_new_psw.addr =
 422                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 423         lc->mcck_new_psw.mask =
 424                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 425         lc->mcck_new_psw.addr =
 426                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 427         lc->io_new_psw.mask = psw_kernel_bits;
 428         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 429         lc->ipl_device = S390_lowcore.ipl_device;
 430         lc->jiffy_timer = -1LL;
 431         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 432         lc->async_stack = (unsigned long)
 433                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 434         lc->panic_stack = (unsigned long)
 435                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 436         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 437         lc->thread_info = (unsigned long) &init_thread_union;
 438 #ifndef CONFIG_64BIT
 439         if (MACHINE_HAS_IEEE) {
 440                 lc->extended_save_area_addr = (__u32)
 441                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 442                 /* enable extended save area */
 443                 __ctl_set_bit(14, 29);
 444         }
 445 #endif
 446         set_prefix((u32)(unsigned long) lc);
 447 }
 448
 449 static void __init
 450 setup_resources(void)
 451 {
 452         struct resource *res, *sub_res;
 453         int i;
 454
 455         code_resource.start = (unsigned long) &_text;
 456         code_resource.end = (unsigned long) &_etext - 1;
 457         data_resource.start = (unsigned long) &_etext;
 458         data_resource.end = (unsigned long) &_edata - 1;
 459
 460         for (i = 0; i < MEMORY_CHUNKS; i++) {
 461                 if (!memory_chunk[i].size)
 462                         continue;
 463                 res = alloc_bootmem_low(sizeof(struct resource));
 464                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 465                 switch (memory_chunk[i].type) {
 466                 case CHUNK_READ_WRITE:
 467                         res->name = "System RAM";
 468                         break;
 469                 case CHUNK_READ_ONLY:
 470                         res->name = "System ROM";
 471                         res->flags |= IORESOURCE_READONLY;
 472                         break;
 473                 default:
 474                         res->name = "reserved";
 475                 }
 476                 res->start = memory_chunk[i].addr;
 477                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 478                 request_resource(&iomem_resource, res);
 479
 480                 if (code_resource.start >= res->start  &&
 481                         code_resource.start <= res->end &&
 482                         code_resource.end > res->end) {
 483                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 484                         memcpy(sub_res, &code_resource,
 485                                 sizeof(struct resource));
 486                         sub_res->end = res->end;
 487                         code_resource.start = res->end + 1;
 488                         request_resource(res, sub_res);
 489                 }
 490
 491                 if (code_resource.start >= res->start &&
 492                         code_resource.start <= res->end &&
 493                         code_resource.end <= res->end)
 494                         request_resource(res, &code_resource);
 495
 496                 if (data_resource.start >= res->start &&
 497                         data_resource.start <= res->end &&
 498                         data_resource.end > res->end) {
 499                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 500                         memcpy(sub_res, &data_resource,
 501                                 sizeof(struct resource));
 502                         sub_res->end = res->end;
 503                         data_resource.start = res->end + 1;
 504                         request_resource(res, sub_res);
 505                 }
 506
 507                 if (data_resource.start >= res->start &&
 508                         data_resource.start <= res->end &&
 509                         data_resource.end <= res->end)
 510                         request_resource(res, &data_resource);
 511         }
 512 }
 513
 514 unsigned long real_memory_size;
 515 EXPORT_SYMBOL_GPL(real_memory_size);
 516
 517 static void __init setup_memory_end(void)
 518 {
 519         unsigned long memory_size;
 520         unsigned long max_mem;
 521         int i;
 522
 523 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 524         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 525                 memory_end = ZFCPDUMP_HSA_SIZE;
 526 #endif
 527         memory_size = 0;
 528         memory_end &= PAGE_MASK;
 529
 530         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 531         memory_end = min(max_mem, memory_end);
 532
 533         /*
 534          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 535          * extra checks that HOLES_IN_ZONE would require.
 536          */
 537         for (i = 0; i < MEMORY_CHUNKS; i++) {
 538                 unsigned long start, end;
 539                 struct mem_chunk *chunk;
 540                 unsigned long align;
 541
 542                 chunk = &memory_chunk[i];
 543                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 544                 start = (chunk->addr + align - 1) & ~(align - 1);
 545                 end = (chunk->addr + chunk->size) & ~(align - 1);
 546                 if (start >= end)
 547                         memset(chunk, 0, sizeof(*chunk));
 548                 else {
 549                         chunk->addr = start;
 550                         chunk->size = end - start;
 551                 }
 552         }
 553
 554         for (i = 0; i < MEMORY_CHUNKS; i++) {
 555                 struct mem_chunk *chunk = &memory_chunk[i];
 556
 557                 real_memory_size = max(real_memory_size,
 558                                        chunk->addr + chunk->size);
 559                 if (chunk->addr >= max_mem) {
 560                         memset(chunk, 0, sizeof(*chunk));
 561                         continue;
 562                 }
 563                 if (chunk->addr + chunk->size > max_mem)
 564                         chunk->size = max_mem - chunk->addr;
 565                 memory_size = max(memory_size, chunk->addr + chunk->size);
 566         }
 567         if (!memory_end)
 568                 memory_end = memory_size;
 569 }
 570
 571 static void __init
 572 setup_memory(void)
 573 {
 574         unsigned long bootmap_size;
 575         unsigned long start_pfn, end_pfn;
 576         int i;
 577
 578         /*
 579          * partially used pages are not usable - thus
 580          * we are rounding upwards:
 581          */
 582         start_pfn = PFN_UP(__pa(&_end));
 583         end_pfn = max_pfn = PFN_DOWN(memory_end);
 584
 585 #ifdef CONFIG_BLK_DEV_INITRD
 586         /*
 587          * Move the initrd in case the bitmap of the bootmem allocater
 588          * would overwrite it.
 589          */
 590
 591         if (INITRD_START && INITRD_SIZE) {
 592                 unsigned long bmap_size;
 593                 unsigned long start;
 594
 595                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 596                 bmap_size = PFN_PHYS(bmap_size);
 597
 598                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 599                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 600
 601                         if (start + INITRD_SIZE > memory_end) {
 602                                 printk("initrd extends beyond end of memory "
 603                                        "(0x%08lx > 0x%08lx)\n"
 604                                        "disabling initrd\n",
 605                                        start + INITRD_SIZE, memory_end);
 606                                 INITRD_START = INITRD_SIZE = 0;
 607                         } else {
 608                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 609                                        "size: %ld)\n",
 610                                        INITRD_START, start, INITRD_SIZE);
 611                                 memmove((void *) start, (void *) INITRD_START,
 612                                         INITRD_SIZE);
 613                                 INITRD_START = start;
 614                         }
 615                 }
 616         }
 617 #endif
 618
 619         /*
 620          * Initialize the boot-time allocator
 621          */
 622         bootmap_size = init_bootmem(start_pfn, end_pfn);
 623
 624         /*
 625          * Register RAM areas with the bootmem allocator.
 626          */
 627
 628         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 629                 unsigned long start_chunk, end_chunk, pfn;
 630
 631                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 632                         continue;
 633                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 634                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 635                 end_chunk = min(end_chunk, end_pfn);
 636                 if (start_chunk >= end_chunk)
 637                         continue;
 638                 add_active_range(0, start_chunk, end_chunk);
 639                 pfn = max(start_chunk, start_pfn);
 640                 for (; pfn <= end_chunk; pfn++)
 641                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 642         }
 643
 644         psw_set_key(PAGE_DEFAULT_KEY);
 645
 646         free_bootmem_with_active_regions(0, max_pfn);
 647
 648         /*
 649          * Reserve memory used for lowcore/command line/kernel image.
 650          */
 651         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 652         reserve_bootmem((unsigned long)_stext,
 653                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 654                         BOOTMEM_DEFAULT);
 655         /*
 656          * Reserve the bootmem bitmap itself as well. We do this in two
 657          * steps (first step was init_bootmem()) because this catches
 658          * the (very unlikely) case of us accidentally initializing the
 659          * bootmem allocator with an invalid RAM area.
 660          */
 661         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 662                         BOOTMEM_DEFAULT);
 663
 664 #ifdef CONFIG_BLK_DEV_INITRD
 665         if (INITRD_START && INITRD_SIZE) {
 666                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 667                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 668                                         BOOTMEM_DEFAULT);
 669                         initrd_start = INITRD_START;
 670                         initrd_end = initrd_start + INITRD_SIZE;
 671                 } else {
 672                         printk("initrd extends beyond end of memory "
 673                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 674                                initrd_start + INITRD_SIZE, memory_end);
 675                         initrd_start = initrd_end = 0;
 676                 }
 677         }
 678 #endif
 679 }
 680
 681 static __init unsigned int stfl(void)
 682 {
 683         asm volatile(
 684                 "       .insn   s,0xb2b10000,0(0)\n" /* stfl */
 685                 "0:\n"
 686                 EX_TABLE(0b,0b));
 687         return S390_lowcore.stfl_fac_list;
 688 }
 689
 690 static __init int stfle(unsigned long long *list, int doublewords)
 691 {
 692         typedef struct { unsigned long long _[doublewords]; } addrtype;
 693         register unsigned long __nr asm("0") = doublewords - 1;
 694
 695         asm volatile(".insn s,0xb2b00000,%0" /* stfle */
 696                      : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
 697         return __nr + 1;
 698 }
 699
 700 /*
 701  * Setup hardware capabilities.
 702  */
 703 static void __init setup_hwcaps(void)
 704 {
 705         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 706         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 707         unsigned long long facility_list_extended;
 708         unsigned int facility_list;
 709         int i;
 710
 711         facility_list = stfl();
 712         /*
 713          * The store facility list bits numbers as found in the principles
 714          * of operation are numbered with bit 1UL<<31 as number 0 to
 715          * bit 1UL<<0 as number 31.
 716          *   Bit 0: instructions named N3, "backported" to esa-mode
 717          *   Bit 2: z/Architecture mode is active
 718          *   Bit 7: the store-facility-list-extended facility is installed
 719          *   Bit 17: the message-security assist is installed
 720          *   Bit 19: the long-displacement facility is installed
 721          *   Bit 21: the extended-immediate facility is installed
 722          * These get translated to:
 723          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 724          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 725          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 726          */
 727         for (i = 0; i < 6; i++)
 728                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 729                         elf_hwcap |= 1UL << i;
 730
 731         /*
 732          * Check for additional facilities with store-facility-list-extended.
 733          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 734          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 735          * as stored by stfl, bits 32-xxx contain additional facilities.
 736          * How many facility words are stored depends on the number of
 737          * doublewords passed to the instruction. The additional facilites
 738          * are:
 739          *   Bit 43: decimal floating point facility is installed
 740          * translated to:
 741          *   HWCAP_S390_DFP bit 6.
 742          */
 743         if ((elf_hwcap & (1UL << 2)) &&
 744             stfle(&facility_list_extended, 1) > 0) {
 745                 if (facility_list_extended & (1ULL << (64 - 43)))
 746                         elf_hwcap |= 1UL << 6;
 747         }
 748
 749         switch (cpuinfo->cpu_id.machine) {
 750         case 0x9672:
 751 #if !defined(CONFIG_64BIT)
 752         default:        /* Use "g5" as default for 31 bit kernels. */
 753 #endif
 754                 strcpy(elf_platform, "g5");
 755                 break;
 756         case 0x2064:
 757         case 0x2066:
 758 #if defined(CONFIG_64BIT)
 759         default:        /* Use "z900" as default for 64 bit kernels. */
 760 #endif
 761                 strcpy(elf_platform, "z900");
 762                 break;
 763         case 0x2084:
 764         case 0x2086:
 765                 strcpy(elf_platform, "z990");
 766                 break;
 767         case 0x2094:
 768                 strcpy(elf_platform, "z9-109");
 769                 break;
 770         }
 771 }
 772
 773 /*
 774  * Setup function called from init/main.c just after the banner
 775  * was printed.
 776  */
 777
 778 void __init
 779 setup_arch(char **cmdline_p)
 780 {
 781         /*
 782          * print what head.S has found out about the machine
 783          */
 784 #ifndef CONFIG_64BIT
 785         printk((MACHINE_IS_VM) ?
 786                "We are running under VM (31 bit mode)\n" :
 787                "We are running native (31 bit mode)\n");
 788         printk((MACHINE_HAS_IEEE) ?
 789                "This machine has an IEEE fpu\n" :
 790                "This machine has no IEEE fpu\n");
 791 #else /* CONFIG_64BIT */
 792         printk((MACHINE_IS_VM) ?
 793                "We are running under VM (64 bit mode)\n" :
 794                "We are running native (64 bit mode)\n");
 795 #endif /* CONFIG_64BIT */
 796
 797         /* Save unparsed command line copy for /proc/cmdline */
 798         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 799
 800         *cmdline_p = COMMAND_LINE;
 801         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 802
 803         ROOT_DEV = Root_RAM0;
 804
 805         init_mm.start_code = PAGE_OFFSET;
 806         init_mm.end_code = (unsigned long) &_etext;
 807         init_mm.end_data = (unsigned long) &_edata;
 808         init_mm.brk = (unsigned long) &_end;
 809
 810         if (MACHINE_HAS_MVCOS)
 811                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 812         else
 813                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 814
 815         parse_early_param();
 816
 817         setup_ipl();
 818         setup_memory_end();
 819         setup_addressing_mode();
 820         setup_memory();
 821         setup_resources();
 822         setup_lowcore();
 823
 824         cpu_init();
 825         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 826
 827         /*
 828          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 829          */
 830         setup_hwcaps();
 831
 832         /*
 833          * Create kernel page tables and switch to virtual addressing.
 834          */
 835         paging_init();
 836
 837         /* Setup default console */
 838         conmode_default();
 839
 840         /* Setup zfcpdump support */
 841         setup_zfcpdump(console_devno);
 842 }
 843
 844 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 845 {
 846    printk(KERN_INFO "cpu %d "
 847 #ifdef CONFIG_SMP
 848            "phys_idx=%d "
 849 #endif
 850            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 851            cpuinfo->cpu_nr,
 852 #ifdef CONFIG_SMP
 853            cpuinfo->cpu_addr,
 854 #endif
 855            cpuinfo->cpu_id.version,
 856            cpuinfo->cpu_id.ident,
 857            cpuinfo->cpu_id.machine,
 858            cpuinfo->cpu_id.unused);
 859 }
 860
 861 /*
 862  * show_cpuinfo - Get information on one CPU for use by procfs.
 863  */
 864
 865 static int show_cpuinfo(struct seq_file *m, void *v)
 866 {
 867         static const char *hwcap_str[7] = {
 868                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
 869         };
 870         struct cpuinfo_S390 *cpuinfo;
 871         unsigned long n = (unsigned long) v - 1;
 872         int i;
 873
 874         s390_adjust_jiffies();
 875         preempt_disable();
 876         if (!n) {
 877                 seq_printf(m, "vendor_id       : IBM/S390\n"
 878                                "# processors    : %i\n"
 879                                "bogomips per cpu: %lu.%02lu\n",
 880                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 881                                (loops_per_jiffy/(5000/HZ))%100);
 882                 seq_puts(m, "features\t: ");
 883                 for (i = 0; i < 7; i++)
 884                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 885                                 seq_printf(m, "%s ", hwcap_str[i]);
 886                 seq_puts(m, "\n");
 887         }
 888
 889         if (cpu_online(n)) {
 890 #ifdef CONFIG_SMP
 891                 if (smp_processor_id() == n)
 892                         cpuinfo = &S390_lowcore.cpu_data;
 893                 else
 894                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 895 #else
 896                 cpuinfo = &S390_lowcore.cpu_data;
 897 #endif
 898                 seq_printf(m, "processor %li: "
 899                                "version = %02X,  "
 900                                "identification = %06X,  "
 901                                "machine = %04X\n",
 902                                n, cpuinfo->cpu_id.version,
 903                                cpuinfo->cpu_id.ident,
 904                                cpuinfo->cpu_id.machine);
 905         }
 906         preempt_enable();
 907         return 0;
 908 }
 909
 910 static void *c_start(struct seq_file *m, loff_t *pos)
 911 {
 912         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 913 }
 914 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 915 {
 916         ++*pos;
 917         return c_start(m, pos);
 918 }
 919 static void c_stop(struct seq_file *m, void *v)
 920 {
 921 }
 922 const struct seq_operations cpuinfo_op = {
 923         .start  = c_start,
 924         .next   = c_next,
 925         .stop   = c_stop,
 926         .show   = show_cpuinfo,
 927 };
 928