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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 #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/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/root_dev.h>
  35 #include <linux/console.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/device.h>
  39 #include <linux/notifier.h>
  40 #include <linux/pfn.h>
  41 #include <linux/ctype.h>
  42 #include <linux/reboot.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 = 0;
  77 unsigned long elf_hwcap = 0;
  78 char elf_platform[ELF_PLATFORM_SIZE];
  79
  80 struct mem_chunk __initdata 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  * VM halt and poweroff setup routines
 130  */
 131 char vmhalt_cmd[128] = "";
 132 char vmpoff_cmd[128] = "";
 133 static char vmpanic_cmd[128] = "";
 134
 135 static void strncpy_skip_quote(char *dst, char *src, int n)
 136 {
 137         int sx, dx;
 138
 139         dx = 0;
 140         for (sx = 0; src[sx] != 0; sx++) {
 141                 if (src[sx] == '"') continue;
 142                 dst[dx++] = src[sx];
 143                 if (dx >= n) break;
 144         }
 145 }
 146
 147 static int __init vmhalt_setup(char *str)
 148 {
 149         strncpy_skip_quote(vmhalt_cmd, str, 127);
 150         vmhalt_cmd[127] = 0;
 151         return 1;
 152 }
 153
 154 __setup("vmhalt=", vmhalt_setup);
 155
 156 static int __init vmpoff_setup(char *str)
 157 {
 158         strncpy_skip_quote(vmpoff_cmd, str, 127);
 159         vmpoff_cmd[127] = 0;
 160         return 1;
 161 }
 162
 163 __setup("vmpoff=", vmpoff_setup);
 164
 165 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 166                           void *data)
 167 {
 168         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 169                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 170
 171         return NOTIFY_OK;
 172 }
 173
 174 #define PANIC_PRI_VMPANIC       0
 175
 176 static struct notifier_block vmpanic_nb = {
 177         .notifier_call = vmpanic_notify,
 178         .priority = PANIC_PRI_VMPANIC
 179 };
 180
 181 static int __init vmpanic_setup(char *str)
 182 {
 183         static int register_done __initdata = 0;
 184
 185         strncpy_skip_quote(vmpanic_cmd, str, 127);
 186         vmpanic_cmd[127] = 0;
 187         if (!register_done) {
 188                 register_done = 1;
 189                 atomic_notifier_chain_register(&panic_notifier_list,
 190                                                &vmpanic_nb);
 191         }
 192         return 1;
 193 }
 194
 195 __setup("vmpanic=", vmpanic_setup);
 196
 197 /*
 198  * condev= and conmode= setup parameter.
 199  */
 200
 201 static int __init condev_setup(char *str)
 202 {
 203         int vdev;
 204
 205         vdev = simple_strtoul(str, &str, 0);
 206         if (vdev >= 0 && vdev < 65536) {
 207                 console_devno = vdev;
 208                 console_irq = -1;
 209         }
 210         return 1;
 211 }
 212
 213 __setup("condev=", condev_setup);
 214
 215 static int __init conmode_setup(char *str)
 216 {
 217 #if defined(CONFIG_SCLP_CONSOLE)
 218         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 219                 SET_CONSOLE_SCLP;
 220 #endif
 221 #if defined(CONFIG_TN3215_CONSOLE)
 222         if (strncmp(str, "3215", 5) == 0)
 223                 SET_CONSOLE_3215;
 224 #endif
 225 #if defined(CONFIG_TN3270_CONSOLE)
 226         if (strncmp(str, "3270", 5) == 0)
 227                 SET_CONSOLE_3270;
 228 #endif
 229         return 1;
 230 }
 231
 232 __setup("conmode=", conmode_setup);
 233
 234 static void __init conmode_default(void)
 235 {
 236         char query_buffer[1024];
 237         char *ptr;
 238
 239         if (MACHINE_IS_VM) {
 240                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 241                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 242                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 243                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 244                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 245                 ptr = strstr(query_buffer, "CONMODE");
 246                 /*
 247                  * Set the conmode to 3215 so that the device recognition
 248                  * will set the cu_type of the console to 3215. If the
 249                  * conmode is 3270 and we don't set it back then both
 250                  * 3215 and the 3270 driver will try to access the console
 251                  * device (3215 as console and 3270 as normal tty).
 252                  */
 253                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 254                 if (ptr == NULL) {
 255 #if defined(CONFIG_SCLP_CONSOLE)
 256                         SET_CONSOLE_SCLP;
 257 #endif
 258                         return;
 259                 }
 260                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 261 #if defined(CONFIG_TN3270_CONSOLE)
 262                         SET_CONSOLE_3270;
 263 #elif defined(CONFIG_TN3215_CONSOLE)
 264                         SET_CONSOLE_3215;
 265 #elif defined(CONFIG_SCLP_CONSOLE)
 266                         SET_CONSOLE_SCLP;
 267 #endif
 268                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 269 #if defined(CONFIG_TN3215_CONSOLE)
 270                         SET_CONSOLE_3215;
 271 #elif defined(CONFIG_TN3270_CONSOLE)
 272                         SET_CONSOLE_3270;
 273 #elif defined(CONFIG_SCLP_CONSOLE)
 274                         SET_CONSOLE_SCLP;
 275 #endif
 276                 }
 277         } else if (MACHINE_IS_P390) {
 278 #if defined(CONFIG_TN3215_CONSOLE)
 279                 SET_CONSOLE_3215;
 280 #elif defined(CONFIG_TN3270_CONSOLE)
 281                 SET_CONSOLE_3270;
 282 #endif
 283         } else {
 284 #if defined(CONFIG_SCLP_CONSOLE)
 285                 SET_CONSOLE_SCLP;
 286 #endif
 287         }
 288 }
 289
 290 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 291 static void __init setup_zfcpdump(unsigned int console_devno)
 292 {
 293         static char str[64];
 294
 295         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 296                 return;
 297         if (console_devno != -1)
 298                 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
 299                         ipl_info.data.fcp.dev_id.devno, console_devno);
 300         else
 301                 sprintf(str, "cio_ignore=all,!0.0.%04x",
 302                         ipl_info.data.fcp.dev_id.devno);
 303         strcat(COMMAND_LINE, " ");
 304         strcat(COMMAND_LINE, str);
 305         console_loglevel = 2;
 306 }
 307 #else
 308 static inline void setup_zfcpdump(unsigned int console_devno) {}
 309 #endif /* CONFIG_ZFCPDUMP */
 310
 311 #ifdef CONFIG_SMP
 312 void (*_machine_restart)(char *command) = machine_restart_smp;
 313 void (*_machine_halt)(void) = machine_halt_smp;
 314 void (*_machine_power_off)(void) = machine_power_off_smp;
 315 #else
 316 /*
 317  * Reboot, halt and power_off routines for non SMP.
 318  */
 319 static void do_machine_restart_nonsmp(char * __unused)
 320 {
 321         do_reipl();
 322 }
 323
 324 static void do_machine_halt_nonsmp(void)
 325 {
 326         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 327                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
 328         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 329 }
 330
 331 static void do_machine_power_off_nonsmp(void)
 332 {
 333         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 334                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
 335         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 336 }
 337
 338 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 339 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 340 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 341 #endif
 342
 343  /*
 344  * Reboot, halt and power_off stubs. They just call _machine_restart,
 345  * _machine_halt or _machine_power_off.
 346  */
 347
 348 void machine_restart(char *command)
 349 {
 350         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 351                 /*
 352                  * Only unblank the console if we are called in enabled
 353                  * context or a bust_spinlocks cleared the way for us.
 354                  */
 355                 console_unblank();
 356         _machine_restart(command);
 357 }
 358
 359 void machine_halt(void)
 360 {
 361         if (!in_interrupt() || oops_in_progress)
 362                 /*
 363                  * Only unblank the console if we are called in enabled
 364                  * context or a bust_spinlocks cleared the way for us.
 365                  */
 366                 console_unblank();
 367         _machine_halt();
 368 }
 369
 370 void machine_power_off(void)
 371 {
 372         if (!in_interrupt() || oops_in_progress)
 373                 /*
 374                  * Only unblank the console if we are called in enabled
 375                  * context or a bust_spinlocks cleared the way for us.
 376                  */
 377                 console_unblank();
 378         _machine_power_off();
 379 }
 380
 381 /*
 382  * Dummy power off function.
 383  */
 384 void (*pm_power_off)(void) = machine_power_off;
 385
 386 static int __init early_parse_mem(char *p)
 387 {
 388         memory_end = memparse(p, &p);
 389         return 0;
 390 }
 391 early_param("mem", early_parse_mem);
 392
 393 /*
 394  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 395  */
 396 static int __init early_parse_ipldelay(char *p)
 397 {
 398         unsigned long delay = 0;
 399
 400         delay = simple_strtoul(p, &p, 0);
 401
 402         switch (*p) {
 403         case 's':
 404         case 'S':
 405                 delay *= 1000000;
 406                 break;
 407         case 'm':
 408         case 'M':
 409                 delay *= 60 * 1000000;
 410         }
 411
 412         /* now wait for the requested amount of time */
 413         udelay(delay);
 414
 415         return 0;
 416 }
 417 early_param("ipldelay", early_parse_ipldelay);
 418
 419 #ifdef CONFIG_S390_SWITCH_AMODE
 420 unsigned int switch_amode = 0;
 421 EXPORT_SYMBOL_GPL(switch_amode);
 422
 423 static void set_amode_and_uaccess(unsigned long user_amode,
 424                                   unsigned long user32_amode)
 425 {
 426         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 427                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 428                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 429 #ifdef CONFIG_COMPAT
 430         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 431                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 432                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 433         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 434                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 435                           PSW32_MASK_PSTATE;
 436 #endif
 437         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 438                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 439
 440         if (MACHINE_HAS_MVCOS) {
 441                 printk("mvcos available.\n");
 442                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 443         } else {
 444                 printk("mvcos not available.\n");
 445                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 446         }
 447 }
 448
 449 /*
 450  * Switch kernel/user addressing modes?
 451  */
 452 static int __init early_parse_switch_amode(char *p)
 453 {
 454         switch_amode = 1;
 455         return 0;
 456 }
 457 early_param("switch_amode", early_parse_switch_amode);
 458
 459 #else /* CONFIG_S390_SWITCH_AMODE */
 460 static inline void set_amode_and_uaccess(unsigned long user_amode,
 461                                          unsigned long user32_amode)
 462 {
 463 }
 464 #endif /* CONFIG_S390_SWITCH_AMODE */
 465
 466 #ifdef CONFIG_S390_EXEC_PROTECT
 467 unsigned int s390_noexec = 0;
 468 EXPORT_SYMBOL_GPL(s390_noexec);
 469
 470 /*
 471  * Enable execute protection?
 472  */
 473 static int __init early_parse_noexec(char *p)
 474 {
 475         if (!strncmp(p, "off", 3))
 476                 return 0;
 477         switch_amode = 1;
 478         s390_noexec = 1;
 479         return 0;
 480 }
 481 early_param("noexec", early_parse_noexec);
 482 #endif /* CONFIG_S390_EXEC_PROTECT */
 483
 484 static void setup_addressing_mode(void)
 485 {
 486         if (s390_noexec) {
 487                 printk("S390 execute protection active, ");
 488                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 489                 return;
 490         }
 491         if (switch_amode) {
 492                 printk("S390 address spaces switched, ");
 493                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 494         }
 495 #ifdef CONFIG_TRACE_IRQFLAGS
 496         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 497         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 498 #endif
 499 }
 500
 501 static void __init
 502 setup_lowcore(void)
 503 {
 504         struct _lowcore *lc;
 505         int lc_pages;
 506
 507         /*
 508          * Setup lowcore for boot cpu
 509          */
 510         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 511         lc = (struct _lowcore *)
 512                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 513         memset(lc, 0, lc_pages * PAGE_SIZE);
 514         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 515         lc->restart_psw.addr =
 516                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 517         if (switch_amode)
 518                 lc->restart_psw.mask |= PSW_ASC_HOME;
 519         lc->external_new_psw.mask = psw_kernel_bits;
 520         lc->external_new_psw.addr =
 521                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 522         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 523         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 524         lc->program_new_psw.mask = psw_kernel_bits;
 525         lc->program_new_psw.addr =
 526                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 527         lc->mcck_new_psw.mask =
 528                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 529         lc->mcck_new_psw.addr =
 530                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 531         lc->io_new_psw.mask = psw_kernel_bits;
 532         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 533         lc->ipl_device = S390_lowcore.ipl_device;
 534         lc->jiffy_timer = -1LL;
 535         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 536         lc->async_stack = (unsigned long)
 537                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 538         lc->panic_stack = (unsigned long)
 539                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 540         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 541         lc->thread_info = (unsigned long) &init_thread_union;
 542 #ifndef CONFIG_64BIT
 543         if (MACHINE_HAS_IEEE) {
 544                 lc->extended_save_area_addr = (__u32)
 545                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 546                 /* enable extended save area */
 547                 __ctl_set_bit(14, 29);
 548         }
 549 #endif
 550         set_prefix((u32)(unsigned long) lc);
 551 }
 552
 553 static void __init
 554 setup_resources(void)
 555 {
 556         struct resource *res, *sub_res;
 557         int i;
 558
 559         code_resource.start = (unsigned long) &_text;
 560         code_resource.end = (unsigned long) &_etext - 1;
 561         data_resource.start = (unsigned long) &_etext;
 562         data_resource.end = (unsigned long) &_edata - 1;
 563
 564         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 565                 res = alloc_bootmem_low(sizeof(struct resource));
 566                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 567                 switch (memory_chunk[i].type) {
 568                 case CHUNK_READ_WRITE:
 569                         res->name = "System RAM";
 570                         break;
 571                 case CHUNK_READ_ONLY:
 572                         res->name = "System ROM";
 573                         res->flags |= IORESOURCE_READONLY;
 574                         break;
 575                 default:
 576                         res->name = "reserved";
 577                 }
 578                 res->start = memory_chunk[i].addr;
 579                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 580                 request_resource(&iomem_resource, res);
 581
 582                 if (code_resource.start >= res->start  &&
 583                         code_resource.start <= res->end &&
 584                         code_resource.end > res->end) {
 585                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 586                         memcpy(sub_res, &code_resource,
 587                                 sizeof(struct resource));
 588                         sub_res->end = res->end;
 589                         code_resource.start = res->end + 1;
 590                         request_resource(res, sub_res);
 591                 }
 592
 593                 if (code_resource.start >= res->start &&
 594                         code_resource.start <= res->end &&
 595                         code_resource.end <= res->end)
 596                         request_resource(res, &code_resource);
 597
 598                 if (data_resource.start >= res->start &&
 599                         data_resource.start <= res->end &&
 600                         data_resource.end > res->end) {
 601                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 602                         memcpy(sub_res, &data_resource,
 603                                 sizeof(struct resource));
 604                         sub_res->end = res->end;
 605                         data_resource.start = res->end + 1;
 606                         request_resource(res, sub_res);
 607                 }
 608
 609                 if (data_resource.start >= res->start &&
 610                         data_resource.start <= res->end &&
 611                         data_resource.end <= res->end)
 612                         request_resource(res, &data_resource);
 613         }
 614 }
 615
 616 unsigned long real_memory_size;
 617 EXPORT_SYMBOL_GPL(real_memory_size);
 618
 619 static void __init setup_memory_end(void)
 620 {
 621         unsigned long memory_size;
 622         unsigned long max_mem, max_phys;
 623         int i;
 624
 625 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 626         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 627                 memory_end = ZFCPDUMP_HSA_SIZE;
 628 #endif
 629         memory_size = 0;
 630         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
 631         memory_end &= PAGE_MASK;
 632
 633         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
 634
 635         for (i = 0; i < MEMORY_CHUNKS; i++) {
 636                 struct mem_chunk *chunk = &memory_chunk[i];
 637
 638                 real_memory_size = max(real_memory_size,
 639                                        chunk->addr + chunk->size);
 640                 if (chunk->addr >= max_mem) {
 641                         memset(chunk, 0, sizeof(*chunk));
 642                         continue;
 643                 }
 644                 if (chunk->addr + chunk->size > max_mem)
 645                         chunk->size = max_mem - chunk->addr;
 646                 memory_size = max(memory_size, chunk->addr + chunk->size);
 647         }
 648         if (!memory_end)
 649                 memory_end = memory_size;
 650 }
 651
 652 static void __init
 653 setup_memory(void)
 654 {
 655         unsigned long bootmap_size;
 656         unsigned long start_pfn, end_pfn;
 657         int i;
 658
 659         /*
 660          * partially used pages are not usable - thus
 661          * we are rounding upwards:
 662          */
 663         start_pfn = PFN_UP(__pa(&_end));
 664         end_pfn = max_pfn = PFN_DOWN(memory_end);
 665
 666 #ifdef CONFIG_BLK_DEV_INITRD
 667         /*
 668          * Move the initrd in case the bitmap of the bootmem allocater
 669          * would overwrite it.
 670          */
 671
 672         if (INITRD_START && INITRD_SIZE) {
 673                 unsigned long bmap_size;
 674                 unsigned long start;
 675
 676                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 677                 bmap_size = PFN_PHYS(bmap_size);
 678
 679                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 680                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 681
 682                         if (start + INITRD_SIZE > memory_end) {
 683                                 printk("initrd extends beyond end of memory "
 684                                        "(0x%08lx > 0x%08lx)\n"
 685                                        "disabling initrd\n",
 686                                        start + INITRD_SIZE, memory_end);
 687                                 INITRD_START = INITRD_SIZE = 0;
 688                         } else {
 689                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 690                                        "size: %ld)\n",
 691                                        INITRD_START, start, INITRD_SIZE);
 692                                 memmove((void *) start, (void *) INITRD_START,
 693                                         INITRD_SIZE);
 694                                 INITRD_START = start;
 695                         }
 696                 }
 697         }
 698 #endif
 699
 700         /*
 701          * Initialize the boot-time allocator
 702          */
 703         bootmap_size = init_bootmem(start_pfn, end_pfn);
 704
 705         /*
 706          * Register RAM areas with the bootmem allocator.
 707          */
 708
 709         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 710                 unsigned long start_chunk, end_chunk, pfn;
 711
 712                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 713                         continue;
 714                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 715                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 716                 end_chunk = min(end_chunk, end_pfn);
 717                 if (start_chunk >= end_chunk)
 718                         continue;
 719                 add_active_range(0, start_chunk, end_chunk);
 720                 pfn = max(start_chunk, start_pfn);
 721                 for (; pfn <= end_chunk; pfn++)
 722                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 723         }
 724
 725         psw_set_key(PAGE_DEFAULT_KEY);
 726
 727         free_bootmem_with_active_regions(0, max_pfn);
 728
 729         /*
 730          * Reserve memory used for lowcore/command line/kernel image.
 731          */
 732         reserve_bootmem(0, (unsigned long)_ehead);
 733         reserve_bootmem((unsigned long)_stext,
 734                         PFN_PHYS(start_pfn) - (unsigned long)_stext);
 735         /*
 736          * Reserve the bootmem bitmap itself as well. We do this in two
 737          * steps (first step was init_bootmem()) because this catches
 738          * the (very unlikely) case of us accidentally initializing the
 739          * bootmem allocator with an invalid RAM area.
 740          */
 741         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 742
 743 #ifdef CONFIG_BLK_DEV_INITRD
 744         if (INITRD_START && INITRD_SIZE) {
 745                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 746                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 747                         initrd_start = INITRD_START;
 748                         initrd_end = initrd_start + INITRD_SIZE;
 749                 } else {
 750                         printk("initrd extends beyond end of memory "
 751                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 752                                initrd_start + INITRD_SIZE, memory_end);
 753                         initrd_start = initrd_end = 0;
 754                 }
 755         }
 756 #endif
 757 }
 758
 759 static __init unsigned int stfl(void)
 760 {
 761         asm volatile(
 762                 "       .insn   s,0xb2b10000,0(0)\n" /* stfl */
 763                 "0:\n"
 764                 EX_TABLE(0b,0b));
 765         return S390_lowcore.stfl_fac_list;
 766 }
 767
 768 static __init int stfle(unsigned long long *list, int doublewords)
 769 {
 770         typedef struct { unsigned long long _[doublewords]; } addrtype;
 771         register unsigned long __nr asm("0") = doublewords - 1;
 772
 773         asm volatile(".insn s,0xb2b00000,%0" /* stfle */
 774                      : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
 775         return __nr + 1;
 776 }
 777
 778 /*
 779  * Setup hardware capabilities.
 780  */
 781 static void __init setup_hwcaps(void)
 782 {
 783         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 784         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 785         unsigned long long facility_list_extended;
 786         unsigned int facility_list;
 787         int i;
 788
 789         facility_list = stfl();
 790         /*
 791          * The store facility list bits numbers as found in the principles
 792          * of operation are numbered with bit 1UL<<31 as number 0 to
 793          * bit 1UL<<0 as number 31.
 794          *   Bit 0: instructions named N3, "backported" to esa-mode
 795          *   Bit 2: z/Architecture mode is active
 796          *   Bit 7: the store-facility-list-extended facility is installed
 797          *   Bit 17: the message-security assist is installed
 798          *   Bit 19: the long-displacement facility is installed
 799          *   Bit 21: the extended-immediate facility is installed
 800          * These get translated to:
 801          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 802          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 803          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 804          */
 805         for (i = 0; i < 6; i++)
 806                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 807                         elf_hwcap |= 1UL << i;
 808
 809         /*
 810          * Check for additional facilities with store-facility-list-extended.
 811          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 812          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 813          * as stored by stfl, bits 32-xxx contain additional facilities.
 814          * How many facility words are stored depends on the number of
 815          * doublewords passed to the instruction. The additional facilites
 816          * are:
 817          *   Bit 43: decimal floating point facility is installed
 818          * translated to:
 819          *   HWCAP_S390_DFP bit 6.
 820          */
 821         if ((elf_hwcap & (1UL << 2)) &&
 822             stfle(&facility_list_extended, 1) > 0) {
 823                 if (facility_list_extended & (1ULL << (64 - 43)))
 824                         elf_hwcap |= 1UL << 6;
 825         }
 826
 827         switch (cpuinfo->cpu_id.machine) {
 828         case 0x9672:
 829 #if !defined(CONFIG_64BIT)
 830         default:        /* Use "g5" as default for 31 bit kernels. */
 831 #endif
 832                 strcpy(elf_platform, "g5");
 833                 break;
 834         case 0x2064:
 835         case 0x2066:
 836 #if defined(CONFIG_64BIT)
 837         default:        /* Use "z900" as default for 64 bit kernels. */
 838 #endif
 839                 strcpy(elf_platform, "z900");
 840                 break;
 841         case 0x2084:
 842         case 0x2086:
 843                 strcpy(elf_platform, "z990");
 844                 break;
 845         case 0x2094:
 846                 strcpy(elf_platform, "z9-109");
 847                 break;
 848         }
 849 }
 850
 851 /*
 852  * Setup function called from init/main.c just after the banner
 853  * was printed.
 854  */
 855
 856 void __init
 857 setup_arch(char **cmdline_p)
 858 {
 859         /*
 860          * print what head.S has found out about the machine
 861          */
 862 #ifndef CONFIG_64BIT
 863         printk((MACHINE_IS_VM) ?
 864                "We are running under VM (31 bit mode)\n" :
 865                "We are running native (31 bit mode)\n");
 866         printk((MACHINE_HAS_IEEE) ?
 867                "This machine has an IEEE fpu\n" :
 868                "This machine has no IEEE fpu\n");
 869 #else /* CONFIG_64BIT */
 870         printk((MACHINE_IS_VM) ?
 871                "We are running under VM (64 bit mode)\n" :
 872                "We are running native (64 bit mode)\n");
 873 #endif /* CONFIG_64BIT */
 874
 875         /* Save unparsed command line copy for /proc/cmdline */
 876         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 877
 878         *cmdline_p = COMMAND_LINE;
 879         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 880
 881         ROOT_DEV = Root_RAM0;
 882
 883         init_mm.start_code = PAGE_OFFSET;
 884         init_mm.end_code = (unsigned long) &_etext;
 885         init_mm.end_data = (unsigned long) &_edata;
 886         init_mm.brk = (unsigned long) &_end;
 887
 888         if (MACHINE_HAS_MVCOS)
 889                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 890         else
 891                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 892
 893         parse_early_param();
 894
 895         setup_ipl_info();
 896         setup_memory_end();
 897         setup_addressing_mode();
 898         setup_memory();
 899         setup_resources();
 900         setup_lowcore();
 901
 902         cpu_init();
 903         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 904         smp_setup_cpu_possible_map();
 905
 906         /*
 907          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 908          */
 909         setup_hwcaps();
 910
 911         /*
 912          * Create kernel page tables and switch to virtual addressing.
 913          */
 914         paging_init();
 915
 916         /* Setup default console */
 917         conmode_default();
 918
 919         /* Setup zfcpdump support */
 920         setup_zfcpdump(console_devno);
 921 }
 922
 923 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 924 {
 925    printk("cpu %d "
 926 #ifdef CONFIG_SMP
 927            "phys_idx=%d "
 928 #endif
 929            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 930            cpuinfo->cpu_nr,
 931 #ifdef CONFIG_SMP
 932            cpuinfo->cpu_addr,
 933 #endif
 934            cpuinfo->cpu_id.version,
 935            cpuinfo->cpu_id.ident,
 936            cpuinfo->cpu_id.machine,
 937            cpuinfo->cpu_id.unused);
 938 }
 939
 940 /*
 941  * show_cpuinfo - Get information on one CPU for use by procfs.
 942  */
 943
 944 static int show_cpuinfo(struct seq_file *m, void *v)
 945 {
 946         static const char *hwcap_str[7] = {
 947                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
 948         };
 949         struct cpuinfo_S390 *cpuinfo;
 950         unsigned long n = (unsigned long) v - 1;
 951         int i;
 952
 953         s390_adjust_jiffies();
 954         preempt_disable();
 955         if (!n) {
 956                 seq_printf(m, "vendor_id       : IBM/S390\n"
 957                                "# processors    : %i\n"
 958                                "bogomips per cpu: %lu.%02lu\n",
 959                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 960                                (loops_per_jiffy/(5000/HZ))%100);
 961                 seq_puts(m, "features\t: ");
 962                 for (i = 0; i < 7; i++)
 963                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 964                                 seq_printf(m, "%s ", hwcap_str[i]);
 965                 seq_puts(m, "\n");
 966         }
 967
 968         if (cpu_online(n)) {
 969 #ifdef CONFIG_SMP
 970                 if (smp_processor_id() == n)
 971                         cpuinfo = &S390_lowcore.cpu_data;
 972                 else
 973                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 974 #else
 975                 cpuinfo = &S390_lowcore.cpu_data;
 976 #endif
 977                 seq_printf(m, "processor %li: "
 978                                "version = %02X,  "
 979                                "identification = %06X,  "
 980                                "machine = %04X\n",
 981                                n, cpuinfo->cpu_id.version,
 982                                cpuinfo->cpu_id.ident,
 983                                cpuinfo->cpu_id.machine);
 984         }
 985         preempt_enable();
 986         return 0;
 987 }
 988
 989 static void *c_start(struct seq_file *m, loff_t *pos)
 990 {
 991         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 992 }
 993 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 994 {
 995         ++*pos;
 996         return c_start(m, pos);
 997 }
 998 static void c_stop(struct seq_file *m, void *v)
 999 {
1000 }
1001 struct seq_operations cpuinfo_op = {
1002         .start  = c_start,
1003         .next   = c_next,
1004         .stop   = c_stop,
1005         .show   = show_cpuinfo,
1006 };
1007