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 #define KMSG_COMPONENT "setup"
  18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  19
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/sched.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/stddef.h>
  26 #include <linux/unistd.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/tty.h>
  31 #include <linux/ioport.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/initrd.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/console.h>
  38 #include <linux/kernel_stat.h>
  39 #include <linux/device.h>
  40 #include <linux/notifier.h>
  41 #include <linux/pfn.h>
  42 #include <linux/ctype.h>
  43 #include <linux/reboot.h>
  44 #include <linux/topology.h>
  45 #include <linux/ftrace.h>
  46
  47 #include <asm/ipl.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/system.h>
  50 #include <asm/smp.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/cpcmd.h>
  53 #include <asm/lowcore.h>
  54 #include <asm/irq.h>
  55 #include <asm/page.h>
  56 #include <asm/ptrace.h>
  57 #include <asm/sections.h>
  58 #include <asm/ebcdic.h>
  59 #include <asm/compat.h>
  60 #include <asm/kvm_virtio.h>
  61
  62 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  63                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  64 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  65                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  66                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  67
  68 /*
  69  * User copy operations.
  70  */
  71 struct uaccess_ops uaccess;
  72 EXPORT_SYMBOL(uaccess);
  73
  74 /*
  75  * Machine setup..
  76  */
  77 unsigned int console_mode = 0;
  78 EXPORT_SYMBOL(console_mode);
  79
  80 unsigned int console_devno = -1;
  81 EXPORT_SYMBOL(console_devno);
  82
  83 unsigned int console_irq = -1;
  84 EXPORT_SYMBOL(console_irq);
  85
  86 unsigned long elf_hwcap = 0;
  87 char elf_platform[ELF_PLATFORM_SIZE];
  88
  89 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  90 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  91
  92 int __initdata memory_end_set;
  93 unsigned long __initdata memory_end;
  94
  95 /* An array with a pointer to the lowcore of every CPU. */
  96 struct _lowcore *lowcore_ptr[NR_CPUS];
  97 EXPORT_SYMBOL(lowcore_ptr);
  98
  99 /*
 100  * This is set up by the setup-routine at boot-time
 101  * for S390 need to find out, what we have to setup
 102  * using address 0x10400 ...
 103  */
 104
 105 #include <asm/setup.h>
 106
 107 static struct resource code_resource = {
 108         .name  = "Kernel code",
 109         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 110 };
 111
 112 static struct resource data_resource = {
 113         .name = "Kernel data",
 114         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 115 };
 116
 117 /*
 118  * cpu_init() initializes state that is per-CPU.
 119  */
 120 void __cpuinit cpu_init(void)
 121 {
 122         /*
 123          * Store processor id in lowcore (used e.g. in timer_interrupt)
 124          */
 125         get_cpu_id(&S390_lowcore.cpu_id);
 126
 127         /*
 128          * Force FPU initialization:
 129          */
 130         clear_thread_flag(TIF_USEDFPU);
 131         clear_used_math();
 132
 133         atomic_inc(&init_mm.mm_count);
 134         current->active_mm = &init_mm;
 135         BUG_ON(current->mm);
 136         enter_lazy_tlb(&init_mm, current);
 137 }
 138
 139 /*
 140  * condev= and conmode= setup parameter.
 141  */
 142
 143 static int __init condev_setup(char *str)
 144 {
 145         int vdev;
 146
 147         vdev = simple_strtoul(str, &str, 0);
 148         if (vdev >= 0 && vdev < 65536) {
 149                 console_devno = vdev;
 150                 console_irq = -1;
 151         }
 152         return 1;
 153 }
 154
 155 __setup("condev=", condev_setup);
 156
 157 static void __init set_preferred_console(void)
 158 {
 159         if (MACHINE_IS_KVM) {
 160                 add_preferred_console("hvc", 0, NULL);
 161                 s390_virtio_console_init();
 162                 return;
 163         }
 164
 165         if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 166                 add_preferred_console("ttyS", 0, NULL);
 167         if (CONSOLE_IS_3270)
 168                 add_preferred_console("tty3270", 0, NULL);
 169 }
 170
 171 static int __init conmode_setup(char *str)
 172 {
 173 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 174         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 175                 SET_CONSOLE_SCLP;
 176 #endif
 177 #if defined(CONFIG_TN3215_CONSOLE)
 178         if (strncmp(str, "3215", 5) == 0)
 179                 SET_CONSOLE_3215;
 180 #endif
 181 #if defined(CONFIG_TN3270_CONSOLE)
 182         if (strncmp(str, "3270", 5) == 0)
 183                 SET_CONSOLE_3270;
 184 #endif
 185         set_preferred_console();
 186         return 1;
 187 }
 188
 189 __setup("conmode=", conmode_setup);
 190
 191 static void __init conmode_default(void)
 192 {
 193         char query_buffer[1024];
 194         char *ptr;
 195
 196         if (MACHINE_IS_VM) {
 197                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 198                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 199                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 200                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 201                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 202                 ptr = strstr(query_buffer, "CONMODE");
 203                 /*
 204                  * Set the conmode to 3215 so that the device recognition
 205                  * will set the cu_type of the console to 3215. If the
 206                  * conmode is 3270 and we don't set it back then both
 207                  * 3215 and the 3270 driver will try to access the console
 208                  * device (3215 as console and 3270 as normal tty).
 209                  */
 210                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 211                 if (ptr == NULL) {
 212 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 213                         SET_CONSOLE_SCLP;
 214 #endif
 215                         return;
 216                 }
 217                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 218 #if defined(CONFIG_TN3270_CONSOLE)
 219                         SET_CONSOLE_3270;
 220 #elif defined(CONFIG_TN3215_CONSOLE)
 221                         SET_CONSOLE_3215;
 222 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 223                         SET_CONSOLE_SCLP;
 224 #endif
 225                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 226 #if defined(CONFIG_TN3215_CONSOLE)
 227                         SET_CONSOLE_3215;
 228 #elif defined(CONFIG_TN3270_CONSOLE)
 229                         SET_CONSOLE_3270;
 230 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 231                         SET_CONSOLE_SCLP;
 232 #endif
 233                 }
 234         } else {
 235 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 236                 SET_CONSOLE_SCLP;
 237 #endif
 238         }
 239 }
 240
 241 #ifdef CONFIG_ZFCPDUMP
 242 static void __init setup_zfcpdump(unsigned int console_devno)
 243 {
 244         static char str[41];
 245
 246         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 247                 return;
 248         if (console_devno != -1)
 249                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 250                         ipl_info.data.fcp.dev_id.devno, console_devno);
 251         else
 252                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 253                         ipl_info.data.fcp.dev_id.devno);
 254         strcat(boot_command_line, str);
 255         console_loglevel = 2;
 256 }
 257 #else
 258 static inline void setup_zfcpdump(unsigned int console_devno) {}
 259 #endif /* CONFIG_ZFCPDUMP */
 260
 261  /*
 262  * Reboot, halt and power_off stubs. They just call _machine_restart,
 263  * _machine_halt or _machine_power_off.
 264  */
 265
 266 void machine_restart(char *command)
 267 {
 268         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 269                 /*
 270                  * Only unblank the console if we are called in enabled
 271                  * context or a bust_spinlocks cleared the way for us.
 272                  */
 273                 console_unblank();
 274         _machine_restart(command);
 275 }
 276
 277 void machine_halt(void)
 278 {
 279         if (!in_interrupt() || oops_in_progress)
 280                 /*
 281                  * Only unblank the console if we are called in enabled
 282                  * context or a bust_spinlocks cleared the way for us.
 283                  */
 284                 console_unblank();
 285         _machine_halt();
 286 }
 287
 288 void machine_power_off(void)
 289 {
 290         if (!in_interrupt() || oops_in_progress)
 291                 /*
 292                  * Only unblank the console if we are called in enabled
 293                  * context or a bust_spinlocks cleared the way for us.
 294                  */
 295                 console_unblank();
 296         _machine_power_off();
 297 }
 298
 299 /*
 300  * Dummy power off function.
 301  */
 302 void (*pm_power_off)(void) = machine_power_off;
 303
 304 static int __init early_parse_mem(char *p)
 305 {
 306         memory_end = memparse(p, &p);
 307         memory_end_set = 1;
 308         return 0;
 309 }
 310 early_param("mem", early_parse_mem);
 311
 312 #ifdef CONFIG_S390_SWITCH_AMODE
 313 unsigned int switch_amode = 0;
 314 EXPORT_SYMBOL_GPL(switch_amode);
 315
 316 static int set_amode_and_uaccess(unsigned long user_amode,
 317                                  unsigned long user32_amode)
 318 {
 319         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 320                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 321                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 322 #ifdef CONFIG_COMPAT
 323         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 324                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 325                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 326         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 327                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 328                           PSW32_MASK_PSTATE;
 329 #endif
 330         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 331                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 332
 333         if (MACHINE_HAS_MVCOS) {
 334                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 335                 return 1;
 336         } else {
 337                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 338                 return 0;
 339         }
 340 }
 341
 342 /*
 343  * Switch kernel/user addressing modes?
 344  */
 345 static int __init early_parse_switch_amode(char *p)
 346 {
 347         switch_amode = 1;
 348         return 0;
 349 }
 350 early_param("switch_amode", early_parse_switch_amode);
 351
 352 #else /* CONFIG_S390_SWITCH_AMODE */
 353 static inline int set_amode_and_uaccess(unsigned long user_amode,
 354                                         unsigned long user32_amode)
 355 {
 356         return 0;
 357 }
 358 #endif /* CONFIG_S390_SWITCH_AMODE */
 359
 360 #ifdef CONFIG_S390_EXEC_PROTECT
 361 unsigned int s390_noexec = 0;
 362 EXPORT_SYMBOL_GPL(s390_noexec);
 363
 364 /*
 365  * Enable execute protection?
 366  */
 367 static int __init early_parse_noexec(char *p)
 368 {
 369         if (!strncmp(p, "off", 3))
 370                 return 0;
 371         switch_amode = 1;
 372         s390_noexec = 1;
 373         return 0;
 374 }
 375 early_param("noexec", early_parse_noexec);
 376 #endif /* CONFIG_S390_EXEC_PROTECT */
 377
 378 static void setup_addressing_mode(void)
 379 {
 380         if (s390_noexec) {
 381                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 382                                           PSW32_ASC_SECONDARY))
 383                         pr_info("Execute protection active, "
 384                                 "mvcos available\n");
 385                 else
 386                         pr_info("Execute protection active, "
 387                                 "mvcos not available\n");
 388         } else if (switch_amode) {
 389                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 390                         pr_info("Address spaces switched, "
 391                                 "mvcos available\n");
 392                 else
 393                         pr_info("Address spaces switched, "
 394                                 "mvcos not available\n");
 395         }
 396 #ifdef CONFIG_TRACE_IRQFLAGS
 397         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 398         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 399 #endif
 400 }
 401
 402 static void __init
 403 setup_lowcore(void)
 404 {
 405         struct _lowcore *lc;
 406         int lc_pages;
 407
 408         /*
 409          * Setup lowcore for boot cpu
 410          */
 411         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 412         lc = (struct _lowcore *)
 413                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 414         memset(lc, 0, lc_pages * PAGE_SIZE);
 415         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 416         lc->restart_psw.addr =
 417                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 418         if (switch_amode)
 419                 lc->restart_psw.mask |= PSW_ASC_HOME;
 420         lc->external_new_psw.mask = psw_kernel_bits;
 421         lc->external_new_psw.addr =
 422                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 423         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 424         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 425         lc->program_new_psw.mask = psw_kernel_bits;
 426         lc->program_new_psw.addr =
 427                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 428         lc->mcck_new_psw.mask =
 429                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 430         lc->mcck_new_psw.addr =
 431                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 432         lc->io_new_psw.mask = psw_kernel_bits;
 433         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 434         lc->clock_comparator = -1ULL;
 435         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 436         lc->async_stack = (unsigned long)
 437                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 438         lc->panic_stack = (unsigned long)
 439                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 440         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 441         lc->thread_info = (unsigned long) &init_thread_union;
 442         lc->machine_flags = S390_lowcore.machine_flags;
 443 #ifndef CONFIG_64BIT
 444         if (MACHINE_HAS_IEEE) {
 445                 lc->extended_save_area_addr = (__u32)
 446                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 447                 /* enable extended save area */
 448                 __ctl_set_bit(14, 29);
 449         }
 450 #else
 451         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 452 #endif
 453         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 454         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 455         lc->exit_timer = S390_lowcore.exit_timer;
 456         lc->user_timer = S390_lowcore.user_timer;
 457         lc->system_timer = S390_lowcore.system_timer;
 458         lc->steal_timer = S390_lowcore.steal_timer;
 459         lc->last_update_timer = S390_lowcore.last_update_timer;
 460         lc->last_update_clock = S390_lowcore.last_update_clock;
 461         lc->ftrace_func = S390_lowcore.ftrace_func;
 462         set_prefix((u32)(unsigned long) lc);
 463         lowcore_ptr[0] = lc;
 464 }
 465
 466 static void __init
 467 setup_resources(void)
 468 {
 469         struct resource *res, *sub_res;
 470         int i;
 471
 472         code_resource.start = (unsigned long) &_text;
 473         code_resource.end = (unsigned long) &_etext - 1;
 474         data_resource.start = (unsigned long) &_etext;
 475         data_resource.end = (unsigned long) &_edata - 1;
 476
 477         for (i = 0; i < MEMORY_CHUNKS; i++) {
 478                 if (!memory_chunk[i].size)
 479                         continue;
 480                 res = alloc_bootmem_low(sizeof(struct resource));
 481                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 482                 switch (memory_chunk[i].type) {
 483                 case CHUNK_READ_WRITE:
 484                         res->name = "System RAM";
 485                         break;
 486                 case CHUNK_READ_ONLY:
 487                         res->name = "System ROM";
 488                         res->flags |= IORESOURCE_READONLY;
 489                         break;
 490                 default:
 491                         res->name = "reserved";
 492                 }
 493                 res->start = memory_chunk[i].addr;
 494                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 495                 request_resource(&iomem_resource, res);
 496
 497                 if (code_resource.start >= res->start  &&
 498                         code_resource.start <= res->end &&
 499                         code_resource.end > res->end) {
 500                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 501                         memcpy(sub_res, &code_resource,
 502                                 sizeof(struct resource));
 503                         sub_res->end = res->end;
 504                         code_resource.start = res->end + 1;
 505                         request_resource(res, sub_res);
 506                 }
 507
 508                 if (code_resource.start >= res->start &&
 509                         code_resource.start <= res->end &&
 510                         code_resource.end <= res->end)
 511                         request_resource(res, &code_resource);
 512
 513                 if (data_resource.start >= res->start &&
 514                         data_resource.start <= res->end &&
 515                         data_resource.end > res->end) {
 516                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 517                         memcpy(sub_res, &data_resource,
 518                                 sizeof(struct resource));
 519                         sub_res->end = res->end;
 520                         data_resource.start = res->end + 1;
 521                         request_resource(res, sub_res);
 522                 }
 523
 524                 if (data_resource.start >= res->start &&
 525                         data_resource.start <= res->end &&
 526                         data_resource.end <= res->end)
 527                         request_resource(res, &data_resource);
 528         }
 529 }
 530
 531 unsigned long real_memory_size;
 532 EXPORT_SYMBOL_GPL(real_memory_size);
 533
 534 static void __init setup_memory_end(void)
 535 {
 536         unsigned long memory_size;
 537         unsigned long max_mem;
 538         int i;
 539
 540 #ifdef CONFIG_ZFCPDUMP
 541         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 542                 memory_end = ZFCPDUMP_HSA_SIZE;
 543                 memory_end_set = 1;
 544         }
 545 #endif
 546         memory_size = 0;
 547         memory_end &= PAGE_MASK;
 548
 549         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 550         memory_end = min(max_mem, memory_end);
 551
 552         /*
 553          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 554          * extra checks that HOLES_IN_ZONE would require.
 555          */
 556         for (i = 0; i < MEMORY_CHUNKS; i++) {
 557                 unsigned long start, end;
 558                 struct mem_chunk *chunk;
 559                 unsigned long align;
 560
 561                 chunk = &memory_chunk[i];
 562                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 563                 start = (chunk->addr + align - 1) & ~(align - 1);
 564                 end = (chunk->addr + chunk->size) & ~(align - 1);
 565                 if (start >= end)
 566                         memset(chunk, 0, sizeof(*chunk));
 567                 else {
 568                         chunk->addr = start;
 569                         chunk->size = end - start;
 570                 }
 571         }
 572
 573         for (i = 0; i < MEMORY_CHUNKS; i++) {
 574                 struct mem_chunk *chunk = &memory_chunk[i];
 575
 576                 real_memory_size = max(real_memory_size,
 577                                        chunk->addr + chunk->size);
 578                 if (chunk->addr >= max_mem) {
 579                         memset(chunk, 0, sizeof(*chunk));
 580                         continue;
 581                 }
 582                 if (chunk->addr + chunk->size > max_mem)
 583                         chunk->size = max_mem - chunk->addr;
 584                 memory_size = max(memory_size, chunk->addr + chunk->size);
 585         }
 586         if (!memory_end)
 587                 memory_end = memory_size;
 588 }
 589
 590 static void __init
 591 setup_memory(void)
 592 {
 593         unsigned long bootmap_size;
 594         unsigned long start_pfn, end_pfn;
 595         int i;
 596
 597         /*
 598          * partially used pages are not usable - thus
 599          * we are rounding upwards:
 600          */
 601         start_pfn = PFN_UP(__pa(&_end));
 602         end_pfn = max_pfn = PFN_DOWN(memory_end);
 603
 604 #ifdef CONFIG_BLK_DEV_INITRD
 605         /*
 606          * Move the initrd in case the bitmap of the bootmem allocater
 607          * would overwrite it.
 608          */
 609
 610         if (INITRD_START && INITRD_SIZE) {
 611                 unsigned long bmap_size;
 612                 unsigned long start;
 613
 614                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 615                 bmap_size = PFN_PHYS(bmap_size);
 616
 617                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 618                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 619
 620                         if (start + INITRD_SIZE > memory_end) {
 621                                 pr_err("initrd extends beyond end of "
 622                                        "memory (0x%08lx > 0x%08lx) "
 623                                        "disabling initrd\n",
 624                                        start + INITRD_SIZE, memory_end);
 625                                 INITRD_START = INITRD_SIZE = 0;
 626                         } else {
 627                                 pr_info("Moving initrd (0x%08lx -> "
 628                                         "0x%08lx, size: %ld)\n",
 629                                         INITRD_START, start, INITRD_SIZE);
 630                                 memmove((void *) start, (void *) INITRD_START,
 631                                         INITRD_SIZE);
 632                                 INITRD_START = start;
 633                         }
 634                 }
 635         }
 636 #endif
 637
 638         /*
 639          * Initialize the boot-time allocator
 640          */
 641         bootmap_size = init_bootmem(start_pfn, end_pfn);
 642
 643         /*
 644          * Register RAM areas with the bootmem allocator.
 645          */
 646
 647         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 648                 unsigned long start_chunk, end_chunk, pfn;
 649
 650                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 651                         continue;
 652                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 653                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 654                 end_chunk = min(end_chunk, end_pfn);
 655                 if (start_chunk >= end_chunk)
 656                         continue;
 657                 add_active_range(0, start_chunk, end_chunk);
 658                 pfn = max(start_chunk, start_pfn);
 659                 for (; pfn < end_chunk; pfn++)
 660                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 661         }
 662
 663         psw_set_key(PAGE_DEFAULT_KEY);
 664
 665         free_bootmem_with_active_regions(0, max_pfn);
 666
 667         /*
 668          * Reserve memory used for lowcore/command line/kernel image.
 669          */
 670         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 671         reserve_bootmem((unsigned long)_stext,
 672                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 673                         BOOTMEM_DEFAULT);
 674         /*
 675          * Reserve the bootmem bitmap itself as well. We do this in two
 676          * steps (first step was init_bootmem()) because this catches
 677          * the (very unlikely) case of us accidentally initializing the
 678          * bootmem allocator with an invalid RAM area.
 679          */
 680         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 681                         BOOTMEM_DEFAULT);
 682
 683 #ifdef CONFIG_BLK_DEV_INITRD
 684         if (INITRD_START && INITRD_SIZE) {
 685                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 686                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 687                                         BOOTMEM_DEFAULT);
 688                         initrd_start = INITRD_START;
 689                         initrd_end = initrd_start + INITRD_SIZE;
 690                 } else {
 691                         pr_err("initrd extends beyond end of "
 692                                "memory (0x%08lx > 0x%08lx) "
 693                                "disabling initrd\n",
 694                                initrd_start + INITRD_SIZE, memory_end);
 695                         initrd_start = initrd_end = 0;
 696                 }
 697         }
 698 #endif
 699 }
 700
 701 /*
 702  * Setup hardware capabilities.
 703  */
 704 static void __init setup_hwcaps(void)
 705 {
 706         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 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          *   Bit 22: extended-translation facility 3 is installed
 723          *   Bit 30: extended-translation facility 3 enhancement facility
 724          * These get translated to:
 725          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 726          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 727          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 728          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 729          */
 730         for (i = 0; i < 6; i++)
 731                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 732                         elf_hwcap |= 1UL << i;
 733
 734         if ((facility_list & (1UL << (31 - 22)))
 735             && (facility_list & (1UL << (31 - 30))))
 736                 elf_hwcap |= 1UL << 8;
 737
 738         /*
 739          * Check for additional facilities with store-facility-list-extended.
 740          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 741          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 742          * as stored by stfl, bits 32-xxx contain additional facilities.
 743          * How many facility words are stored depends on the number of
 744          * doublewords passed to the instruction. The additional facilites
 745          * are:
 746          *   Bit 42: decimal floating point facility is installed
 747          *   Bit 44: perform floating point operation facility is installed
 748          * translated to:
 749          *   HWCAP_S390_DFP bit 6 (42 && 44).
 750          */
 751         if ((elf_hwcap & (1UL << 2)) &&
 752             __stfle(&facility_list_extended, 1) > 0) {
 753                 if ((facility_list_extended & (1ULL << (63 - 42)))
 754                     && (facility_list_extended & (1ULL << (63 - 44))))
 755                         elf_hwcap |= 1UL << 6;
 756         }
 757
 758         if (MACHINE_HAS_HPAGE)
 759                 elf_hwcap |= 1UL << 7;
 760
 761         switch (S390_lowcore.cpu_id.machine) {
 762         case 0x9672:
 763 #if !defined(CONFIG_64BIT)
 764         default:        /* Use "g5" as default for 31 bit kernels. */
 765 #endif
 766                 strcpy(elf_platform, "g5");
 767                 break;
 768         case 0x2064:
 769         case 0x2066:
 770 #if defined(CONFIG_64BIT)
 771         default:        /* Use "z900" as default for 64 bit kernels. */
 772 #endif
 773                 strcpy(elf_platform, "z900");
 774                 break;
 775         case 0x2084:
 776         case 0x2086:
 777                 strcpy(elf_platform, "z990");
 778                 break;
 779         case 0x2094:
 780         case 0x2096:
 781                 strcpy(elf_platform, "z9-109");
 782                 break;
 783         case 0x2097:
 784         case 0x2098:
 785                 strcpy(elf_platform, "z10");
 786                 break;
 787         }
 788 }
 789
 790 /*
 791  * Setup function called from init/main.c just after the banner
 792  * was printed.
 793  */
 794
 795 void __init
 796 setup_arch(char **cmdline_p)
 797 {
 798         /*
 799          * print what head.S has found out about the machine
 800          */
 801 #ifndef CONFIG_64BIT
 802         if (MACHINE_IS_VM)
 803                 pr_info("Linux is running as a z/VM "
 804                         "guest operating system in 31-bit mode\n");
 805         else
 806                 pr_info("Linux is running natively in 31-bit mode\n");
 807         if (MACHINE_HAS_IEEE)
 808                 pr_info("The hardware system has IEEE compatible "
 809                         "floating point units\n");
 810         else
 811                 pr_info("The hardware system has no IEEE compatible "
 812                         "floating point units\n");
 813 #else /* CONFIG_64BIT */
 814         if (MACHINE_IS_VM)
 815                 pr_info("Linux is running as a z/VM "
 816                         "guest operating system in 64-bit mode\n");
 817         else if (MACHINE_IS_KVM)
 818                 pr_info("Linux is running under KVM in 64-bit mode\n");
 819         else
 820                 pr_info("Linux is running natively in 64-bit mode\n");
 821 #endif /* CONFIG_64BIT */
 822
 823         /* Have one command line that is parsed and saved in /proc/cmdline */
 824         /* boot_command_line has been already set up in early.c */
 825         *cmdline_p = boot_command_line;
 826
 827         ROOT_DEV = Root_RAM0;
 828
 829         init_mm.start_code = PAGE_OFFSET;
 830         init_mm.end_code = (unsigned long) &_etext;
 831         init_mm.end_data = (unsigned long) &_edata;
 832         init_mm.brk = (unsigned long) &_end;
 833
 834         if (MACHINE_HAS_MVCOS)
 835                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 836         else
 837                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 838
 839         parse_early_param();
 840
 841         setup_ipl();
 842         setup_memory_end();
 843         setup_addressing_mode();
 844         setup_memory();
 845         setup_resources();
 846         setup_lowcore();
 847
 848         cpu_init();
 849         __cpu_logical_map[0] = stap();
 850         s390_init_cpu_topology();
 851
 852         /*
 853          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 854          */
 855         setup_hwcaps();
 856
 857         /*
 858          * Create kernel page tables and switch to virtual addressing.
 859          */
 860         paging_init();
 861
 862         /* Setup default console */
 863         conmode_default();
 864         set_preferred_console();
 865
 866         /* Setup zfcpdump support */
 867         setup_zfcpdump(console_devno);
 868 }