arch/s390/kernel/setup.c

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 1999, 2012
   4  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  *
   7  *  Derived from "arch/i386/kernel/setup.c"
   8  *    Copyright (C) 1995, Linus Torvalds
   9  */
  10
  11 /*
  12  * This file handles the architecture-dependent parts of initialization
  13  */
  14
  15 #define KMSG_COMPONENT "setup"
  16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  17
  18 #include <linux/errno.h>
  19 #include <linux/module.h>
  20 #include <linux/sched.h>
  21 #include <linux/kernel.h>
  22 #include <linux/memblock.h>
  23 #include <linux/mm.h>
  24 #include <linux/stddef.h>
  25 #include <linux/unistd.h>
  26 #include <linux/ptrace.h>
  27 #include <linux/user.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/kernel_stat.h>
  37 #include <linux/device.h>
  38 #include <linux/notifier.h>
  39 #include <linux/pfn.h>
  40 #include <linux/ctype.h>
  41 #include <linux/reboot.h>
  42 #include <linux/topology.h>
  43 #include <linux/ftrace.h>
  44 #include <linux/kexec.h>
  45 #include <linux/crash_dump.h>
  46 #include <linux/memory.h>
  47 #include <linux/compat.h>
  48
  49 #include <asm/ipl.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/facility.h>
  52 #include <asm/smp.h>
  53 #include <asm/mmu_context.h>
  54 #include <asm/cpcmd.h>
  55 #include <asm/lowcore.h>
  56 #include <asm/irq.h>
  57 #include <asm/page.h>
  58 #include <asm/ptrace.h>
  59 #include <asm/sections.h>
  60 #include <asm/ebcdic.h>
  61 #include <asm/kvm_virtio.h>
  62 #include <asm/diag.h>
  63 #include <asm/os_info.h>
  64 #include <asm/sclp.h>
  65 #include "entry.h"
  66
  67 long psw_kernel_bits    = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
  68                           PSW_MASK_EA | PSW_MASK_BA;
  69 long psw_user_bits      = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
  70                           PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
  71                           PSW_MASK_PSTATE | PSW_ASC_HOME;
  72
  73 /*
  74  * User copy operations.
  75  */
  76 struct uaccess_ops uaccess;
  77 EXPORT_SYMBOL(uaccess);
  78
  79 /*
  80  * Machine setup..
  81  */
  82 unsigned int console_mode = 0;
  83 EXPORT_SYMBOL(console_mode);
  84
  85 unsigned int console_devno = -1;
  86 EXPORT_SYMBOL(console_devno);
  87
  88 unsigned int console_irq = -1;
  89 EXPORT_SYMBOL(console_irq);
  90
  91 unsigned long elf_hwcap = 0;
  92 char elf_platform[ELF_PLATFORM_SIZE];
  93
  94 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  95
  96 int __initdata memory_end_set;
  97 unsigned long __initdata memory_end;
  98
  99 unsigned long VMALLOC_START;
 100 EXPORT_SYMBOL(VMALLOC_START);
 101
 102 unsigned long VMALLOC_END;
 103 EXPORT_SYMBOL(VMALLOC_END);
 104
 105 struct page *vmemmap;
 106 EXPORT_SYMBOL(vmemmap);
 107
 108 /* An array with a pointer to the lowcore of every CPU. */
 109 struct _lowcore *lowcore_ptr[NR_CPUS];
 110 EXPORT_SYMBOL(lowcore_ptr);
 111
 112 /*
 113  * This is set up by the setup-routine at boot-time
 114  * for S390 need to find out, what we have to setup
 115  * using address 0x10400 ...
 116  */
 117
 118 #include <asm/setup.h>
 119
 120 /*
 121  * condev= and conmode= setup parameter.
 122  */
 123
 124 static int __init condev_setup(char *str)
 125 {
 126         int vdev;
 127
 128         vdev = simple_strtoul(str, &str, 0);
 129         if (vdev >= 0 && vdev < 65536) {
 130                 console_devno = vdev;
 131                 console_irq = -1;
 132         }
 133         return 1;
 134 }
 135
 136 __setup("condev=", condev_setup);
 137
 138 static void __init set_preferred_console(void)
 139 {
 140         if (MACHINE_IS_KVM) {
 141                 if (sclp_has_vt220())
 142                         add_preferred_console("ttyS", 1, NULL);
 143                 else if (sclp_has_linemode())
 144                         add_preferred_console("ttyS", 0, NULL);
 145                 else
 146                         add_preferred_console("hvc", 0, NULL);
 147         } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 148                 add_preferred_console("ttyS", 0, NULL);
 149         else if (CONSOLE_IS_3270)
 150                 add_preferred_console("tty3270", 0, NULL);
 151 }
 152
 153 static int __init conmode_setup(char *str)
 154 {
 155 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 156         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 157                 SET_CONSOLE_SCLP;
 158 #endif
 159 #if defined(CONFIG_TN3215_CONSOLE)
 160         if (strncmp(str, "3215", 5) == 0)
 161                 SET_CONSOLE_3215;
 162 #endif
 163 #if defined(CONFIG_TN3270_CONSOLE)
 164         if (strncmp(str, "3270", 5) == 0)
 165                 SET_CONSOLE_3270;
 166 #endif
 167         set_preferred_console();
 168         return 1;
 169 }
 170
 171 __setup("conmode=", conmode_setup);
 172
 173 static void __init conmode_default(void)
 174 {
 175         char query_buffer[1024];
 176         char *ptr;
 177
 178         if (MACHINE_IS_VM) {
 179                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 180                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 181                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 182                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 183                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 184                 ptr = strstr(query_buffer, "CONMODE");
 185                 /*
 186                  * Set the conmode to 3215 so that the device recognition
 187                  * will set the cu_type of the console to 3215. If the
 188                  * conmode is 3270 and we don't set it back then both
 189                  * 3215 and the 3270 driver will try to access the console
 190                  * device (3215 as console and 3270 as normal tty).
 191                  */
 192                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 193                 if (ptr == NULL) {
 194 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 195                         SET_CONSOLE_SCLP;
 196 #endif
 197                         return;
 198                 }
 199                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 200 #if defined(CONFIG_TN3270_CONSOLE)
 201                         SET_CONSOLE_3270;
 202 #elif defined(CONFIG_TN3215_CONSOLE)
 203                         SET_CONSOLE_3215;
 204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 205                         SET_CONSOLE_SCLP;
 206 #endif
 207                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 208 #if defined(CONFIG_TN3215_CONSOLE)
 209                         SET_CONSOLE_3215;
 210 #elif defined(CONFIG_TN3270_CONSOLE)
 211                         SET_CONSOLE_3270;
 212 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 213                         SET_CONSOLE_SCLP;
 214 #endif
 215                 }
 216         } else {
 217 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 218                 SET_CONSOLE_SCLP;
 219 #endif
 220         }
 221 }
 222
 223 #ifdef CONFIG_ZFCPDUMP
 224 static void __init setup_zfcpdump(unsigned int console_devno)
 225 {
 226         static char str[41];
 227
 228         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 229                 return;
 230         if (OLDMEM_BASE)
 231                 return;
 232         if (console_devno != -1)
 233                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 234                         ipl_info.data.fcp.dev_id.devno, console_devno);
 235         else
 236                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 237                         ipl_info.data.fcp.dev_id.devno);
 238         strcat(boot_command_line, str);
 239         console_loglevel = 2;
 240 }
 241 #else
 242 static inline void setup_zfcpdump(unsigned int console_devno) {}
 243 #endif /* CONFIG_ZFCPDUMP */
 244
 245  /*
 246  * Reboot, halt and power_off stubs. They just call _machine_restart,
 247  * _machine_halt or _machine_power_off.
 248  */
 249
 250 void machine_restart(char *command)
 251 {
 252         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 253                 /*
 254                  * Only unblank the console if we are called in enabled
 255                  * context or a bust_spinlocks cleared the way for us.
 256                  */
 257                 console_unblank();
 258         _machine_restart(command);
 259 }
 260
 261 void machine_halt(void)
 262 {
 263         if (!in_interrupt() || oops_in_progress)
 264                 /*
 265                  * Only unblank the console if we are called in enabled
 266                  * context or a bust_spinlocks cleared the way for us.
 267                  */
 268                 console_unblank();
 269         _machine_halt();
 270 }
 271
 272 void machine_power_off(void)
 273 {
 274         if (!in_interrupt() || oops_in_progress)
 275                 /*
 276                  * Only unblank the console if we are called in enabled
 277                  * context or a bust_spinlocks cleared the way for us.
 278                  */
 279                 console_unblank();
 280         _machine_power_off();
 281 }
 282
 283 /*
 284  * Dummy power off function.
 285  */
 286 void (*pm_power_off)(void) = machine_power_off;
 287
 288 static int __init early_parse_mem(char *p)
 289 {
 290         memory_end = memparse(p, &p);
 291         memory_end_set = 1;
 292         return 0;
 293 }
 294 early_param("mem", early_parse_mem);
 295
 296 static int __init parse_vmalloc(char *arg)
 297 {
 298         if (!arg)
 299                 return -EINVAL;
 300         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
 301         return 0;
 302 }
 303 early_param("vmalloc", parse_vmalloc);
 304
 305 unsigned int addressing_mode = HOME_SPACE_MODE;
 306 EXPORT_SYMBOL_GPL(addressing_mode);
 307
 308 static int set_amode_primary(void)
 309 {
 310         psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
 311         psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
 312 #ifdef CONFIG_COMPAT
 313         psw32_user_bits =
 314                 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
 315 #endif
 316
 317         if (MACHINE_HAS_MVCOS) {
 318                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 319                 return 1;
 320         } else {
 321                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 322                 return 0;
 323         }
 324 }
 325
 326 /*
 327  * Switch kernel/user addressing modes?
 328  */
 329 static int __init early_parse_switch_amode(char *p)
 330 {
 331         addressing_mode = PRIMARY_SPACE_MODE;
 332         return 0;
 333 }
 334 early_param("switch_amode", early_parse_switch_amode);
 335
 336 static int __init early_parse_user_mode(char *p)
 337 {
 338         if (p && strcmp(p, "primary") == 0)
 339                 addressing_mode = PRIMARY_SPACE_MODE;
 340         else if (!p || strcmp(p, "home") == 0)
 341                 addressing_mode = HOME_SPACE_MODE;
 342         else
 343                 return 1;
 344         return 0;
 345 }
 346 early_param("user_mode", early_parse_user_mode);
 347
 348 static void setup_addressing_mode(void)
 349 {
 350         if (addressing_mode == PRIMARY_SPACE_MODE) {
 351                 if (set_amode_primary())
 352                         pr_info("Address spaces switched, "
 353                                 "mvcos available\n");
 354                 else
 355                         pr_info("Address spaces switched, "
 356                                 "mvcos not available\n");
 357         }
 358 }
 359
 360 void *restart_stack __attribute__((__section__(".data")));
 361
 362 static void __init setup_lowcore(void)
 363 {
 364         struct _lowcore *lc;
 365
 366         /*
 367          * Setup lowcore for boot cpu
 368          */
 369         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 370         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 371         lc->restart_psw.mask = psw_kernel_bits;
 372         lc->restart_psw.addr =
 373                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 374         lc->external_new_psw.mask = psw_kernel_bits |
 375                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 376         lc->external_new_psw.addr =
 377                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 378         lc->svc_new_psw.mask = psw_kernel_bits |
 379                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 380         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 381         lc->program_new_psw.mask = psw_kernel_bits |
 382                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 383         lc->program_new_psw.addr =
 384                 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
 385         lc->mcck_new_psw.mask = psw_kernel_bits;
 386         lc->mcck_new_psw.addr =
 387                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 388         lc->io_new_psw.mask = psw_kernel_bits |
 389                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 390         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 391         lc->clock_comparator = -1ULL;
 392         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 393         lc->async_stack = (unsigned long)
 394                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 395         lc->panic_stack = (unsigned long)
 396                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 397         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 398         lc->thread_info = (unsigned long) &init_thread_union;
 399         lc->machine_flags = S390_lowcore.machine_flags;
 400         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 401         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 402                MAX_FACILITY_BIT/8);
 403 #ifndef CONFIG_64BIT
 404         if (MACHINE_HAS_IEEE) {
 405                 lc->extended_save_area_addr = (__u32)
 406                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 407                 /* enable extended save area */
 408                 __ctl_set_bit(14, 29);
 409         }
 410 #else
 411         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 412 #endif
 413         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 414         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 415         lc->exit_timer = S390_lowcore.exit_timer;
 416         lc->user_timer = S390_lowcore.user_timer;
 417         lc->system_timer = S390_lowcore.system_timer;
 418         lc->steal_timer = S390_lowcore.steal_timer;
 419         lc->last_update_timer = S390_lowcore.last_update_timer;
 420         lc->last_update_clock = S390_lowcore.last_update_clock;
 421         lc->ftrace_func = S390_lowcore.ftrace_func;
 422
 423         restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
 424         restart_stack += ASYNC_SIZE;
 425
 426         /*
 427          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 428          * restart data to the absolute zero lowcore. This is necesary if
 429          * PSW restart is done on an offline CPU that has lowcore zero.
 430          */
 431         lc->restart_stack = (unsigned long) restart_stack;
 432         lc->restart_fn = (unsigned long) do_restart;
 433         lc->restart_data = 0;
 434         lc->restart_source = -1UL;
 435
 436         /* Setup absolute zero lowcore */
 437         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
 438         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
 439         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
 440         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
 441         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 442
 443         set_prefix((u32)(unsigned long) lc);
 444         lowcore_ptr[0] = lc;
 445 }
 446
 447 static struct resource code_resource = {
 448         .name  = "Kernel code",
 449         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 450 };
 451
 452 static struct resource data_resource = {
 453         .name = "Kernel data",
 454         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 455 };
 456
 457 static struct resource bss_resource = {
 458         .name = "Kernel bss",
 459         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 460 };
 461
 462 static struct resource __initdata *standard_resources[] = {
 463         &code_resource,
 464         &data_resource,
 465         &bss_resource,
 466 };
 467
 468 static void __init setup_resources(void)
 469 {
 470         struct resource *res, *std_res, *sub_res;
 471         int i, j;
 472
 473         code_resource.start = (unsigned long) &_text;
 474         code_resource.end = (unsigned long) &_etext - 1;
 475         data_resource.start = (unsigned long) &_etext;
 476         data_resource.end = (unsigned long) &_edata - 1;
 477         bss_resource.start = (unsigned long) &__bss_start;
 478         bss_resource.end = (unsigned long) &__bss_stop - 1;
 479
 480         for (i = 0; i < MEMORY_CHUNKS; i++) {
 481                 if (!memory_chunk[i].size)
 482                         continue;
 483                 if (memory_chunk[i].type == CHUNK_OLDMEM ||
 484                     memory_chunk[i].type == CHUNK_CRASHK)
 485                         continue;
 486                 res = alloc_bootmem_low(sizeof(*res));
 487                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 488                 switch (memory_chunk[i].type) {
 489                 case CHUNK_READ_WRITE:
 490                 case CHUNK_CRASHK:
 491                         res->name = "System RAM";
 492                         break;
 493                 case CHUNK_READ_ONLY:
 494                         res->name = "System ROM";
 495                         res->flags |= IORESOURCE_READONLY;
 496                         break;
 497                 default:
 498                         res->name = "reserved";
 499                 }
 500                 res->start = memory_chunk[i].addr;
 501                 res->end = res->start + memory_chunk[i].size - 1;
 502                 request_resource(&iomem_resource, res);
 503
 504                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 505                         std_res = standard_resources[j];
 506                         if (std_res->start < res->start ||
 507                             std_res->start > res->end)
 508                                 continue;
 509                         if (std_res->end > res->end) {
 510                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 511                                 *sub_res = *std_res;
 512                                 sub_res->end = res->end;
 513                                 std_res->start = res->end + 1;
 514                                 request_resource(res, sub_res);
 515                         } else {
 516                                 request_resource(res, std_res);
 517                         }
 518                 }
 519         }
 520 }
 521
 522 unsigned long real_memory_size;
 523 EXPORT_SYMBOL_GPL(real_memory_size);
 524
 525 static void __init setup_memory_end(void)
 526 {
 527         unsigned long vmax, vmalloc_size, tmp;
 528         int i;
 529
 530
 531 #ifdef CONFIG_ZFCPDUMP
 532         if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
 533                 memory_end = ZFCPDUMP_HSA_SIZE;
 534                 memory_end_set = 1;
 535         }
 536 #endif
 537         real_memory_size = 0;
 538         memory_end &= PAGE_MASK;
 539
 540         /*
 541          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 542          * extra checks that HOLES_IN_ZONE would require.
 543          */
 544         for (i = 0; i < MEMORY_CHUNKS; i++) {
 545                 unsigned long start, end;
 546                 struct mem_chunk *chunk;
 547                 unsigned long align;
 548
 549                 chunk = &memory_chunk[i];
 550                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 551                 start = (chunk->addr + align - 1) & ~(align - 1);
 552                 end = (chunk->addr + chunk->size) & ~(align - 1);
 553                 if (start >= end)
 554                         memset(chunk, 0, sizeof(*chunk));
 555                 else {
 556                         chunk->addr = start;
 557                         chunk->size = end - start;
 558                 }
 559                 real_memory_size = max(real_memory_size,
 560                                        chunk->addr + chunk->size);
 561         }
 562
 563         /* Choose kernel address space layout: 2, 3, or 4 levels. */
 564 #ifdef CONFIG_64BIT
 565         vmalloc_size = VMALLOC_END ?: 128UL << 30;
 566         tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
 567         tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
 568         if (tmp <= (1UL << 42))
 569                 vmax = 1UL << 42;       /* 3-level kernel page table */
 570         else
 571                 vmax = 1UL << 53;       /* 4-level kernel page table */
 572 #else
 573         vmalloc_size = VMALLOC_END ?: 96UL << 20;
 574         vmax = 1UL << 31;               /* 2-level kernel page table */
 575 #endif
 576         /* vmalloc area is at the end of the kernel address space. */
 577         VMALLOC_END = vmax;
 578         VMALLOC_START = vmax - vmalloc_size;
 579
 580         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 581         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 582         tmp = VMALLOC_START - tmp * sizeof(struct page);
 583         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 584         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 585         vmemmap = (struct page *) tmp;
 586
 587         /* Take care that memory_end is set and <= vmemmap */
 588         memory_end = min(memory_end ?: real_memory_size, tmp);
 589
 590         /* Fixup memory chunk array to fit into 0..memory_end */
 591         for (i = 0; i < MEMORY_CHUNKS; i++) {
 592                 struct mem_chunk *chunk = &memory_chunk[i];
 593
 594                 if (chunk->addr >= memory_end) {
 595                         memset(chunk, 0, sizeof(*chunk));
 596                         continue;
 597                 }
 598                 if (chunk->addr + chunk->size > memory_end)
 599                         chunk->size = memory_end - chunk->addr;
 600         }
 601 }
 602
 603 static void __init setup_vmcoreinfo(void)
 604 {
 605 #ifdef CONFIG_KEXEC
 606         mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
 607 #endif
 608 }
 609
 610 #ifdef CONFIG_CRASH_DUMP
 611
 612 /*
 613  * Find suitable location for crashkernel memory
 614  */
 615 static unsigned long __init find_crash_base(unsigned long crash_size,
 616                                             char **msg)
 617 {
 618         unsigned long crash_base;
 619         struct mem_chunk *chunk;
 620         int i;
 621
 622         if (memory_chunk[0].size < crash_size) {
 623                 *msg = "first memory chunk must be at least crashkernel size";
 624                 return 0;
 625         }
 626         if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
 627                 return OLDMEM_BASE;
 628
 629         for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
 630                 chunk = &memory_chunk[i];
 631                 if (chunk->size == 0)
 632                         continue;
 633                 if (chunk->type != CHUNK_READ_WRITE)
 634                         continue;
 635                 if (chunk->size < crash_size)
 636                         continue;
 637                 crash_base = (chunk->addr + chunk->size) - crash_size;
 638                 if (crash_base < crash_size)
 639                         continue;
 640                 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
 641                         continue;
 642                 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
 643                         continue;
 644                 return crash_base;
 645         }
 646         *msg = "no suitable area found";
 647         return 0;
 648 }
 649
 650 /*
 651  * Check if crash_base and crash_size is valid
 652  */
 653 static int __init verify_crash_base(unsigned long crash_base,
 654                                     unsigned long crash_size,
 655                                     char **msg)
 656 {
 657         struct mem_chunk *chunk;
 658         int i;
 659
 660         /*
 661          * Because we do the swap to zero, we must have at least 'crash_size'
 662          * bytes free space before crash_base
 663          */
 664         if (crash_size > crash_base) {
 665                 *msg = "crashkernel offset must be greater than size";
 666                 return -EINVAL;
 667         }
 668
 669         /* First memory chunk must be at least crash_size */
 670         if (memory_chunk[0].size < crash_size) {
 671                 *msg = "first memory chunk must be at least crashkernel size";
 672                 return -EINVAL;
 673         }
 674         /* Check if we fit into the respective memory chunk */
 675         for (i = 0; i < MEMORY_CHUNKS; i++) {
 676                 chunk = &memory_chunk[i];
 677                 if (chunk->size == 0)
 678                         continue;
 679                 if (crash_base < chunk->addr)
 680                         continue;
 681                 if (crash_base >= chunk->addr + chunk->size)
 682                         continue;
 683                 /* we have found the memory chunk */
 684                 if (crash_base + crash_size > chunk->addr + chunk->size) {
 685                         *msg = "selected memory chunk is too small for "
 686                                 "crashkernel memory";
 687                         return -EINVAL;
 688                 }
 689                 return 0;
 690         }
 691         *msg = "invalid memory range specified";
 692         return -EINVAL;
 693 }
 694
 695 /*
 696  * Reserve kdump memory by creating a memory hole in the mem_chunk array
 697  */
 698 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
 699                                          int type)
 700 {
 701         create_mem_hole(memory_chunk, addr, size, type);
 702 }
 703
 704 /*
 705  * When kdump is enabled, we have to ensure that no memory from
 706  * the area [0 - crashkernel memory size] and
 707  * [crashk_res.start - crashk_res.end] is set offline.
 708  */
 709 static int kdump_mem_notifier(struct notifier_block *nb,
 710                               unsigned long action, void *data)
 711 {
 712         struct memory_notify *arg = data;
 713
 714         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 715                 return NOTIFY_BAD;
 716         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 717                 return NOTIFY_OK;
 718         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 719                 return NOTIFY_OK;
 720         return NOTIFY_BAD;
 721 }
 722
 723 static struct notifier_block kdump_mem_nb = {
 724         .notifier_call = kdump_mem_notifier,
 725 };
 726
 727 #endif
 728
 729 /*
 730  * Make sure that oldmem, where the dump is stored, is protected
 731  */
 732 static void reserve_oldmem(void)
 733 {
 734 #ifdef CONFIG_CRASH_DUMP
 735         if (!OLDMEM_BASE)
 736                 return;
 737
 738         reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
 739         reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
 740                               CHUNK_OLDMEM);
 741         if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
 742                 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
 743         else
 744                 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
 745 #endif
 746 }
 747
 748 /*
 749  * Reserve memory for kdump kernel to be loaded with kexec
 750  */
 751 static void __init reserve_crashkernel(void)
 752 {
 753 #ifdef CONFIG_CRASH_DUMP
 754         unsigned long long crash_base, crash_size;
 755         char *msg = NULL;
 756         int rc;
 757
 758         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 759                                &crash_base);
 760         if (rc || crash_size == 0)
 761                 return;
 762         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 763         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 764         if (register_memory_notifier(&kdump_mem_nb))
 765                 return;
 766         if (!crash_base)
 767                 crash_base = find_crash_base(crash_size, &msg);
 768         if (!crash_base) {
 769                 pr_info("crashkernel reservation failed: %s\n", msg);
 770                 unregister_memory_notifier(&kdump_mem_nb);
 771                 return;
 772         }
 773         if (verify_crash_base(crash_base, crash_size, &msg)) {
 774                 pr_info("crashkernel reservation failed: %s\n", msg);
 775                 unregister_memory_notifier(&kdump_mem_nb);
 776                 return;
 777         }
 778         if (!OLDMEM_BASE && MACHINE_IS_VM)
 779                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 780         crashk_res.start = crash_base;
 781         crashk_res.end = crash_base + crash_size - 1;
 782         insert_resource(&iomem_resource, &crashk_res);
 783         reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
 784         pr_info("Reserving %lluMB of memory at %lluMB "
 785                 "for crashkernel (System RAM: %luMB)\n",
 786                 crash_size >> 20, crash_base >> 20, memory_end >> 20);
 787         os_info_crashkernel_add(crash_base, crash_size);
 788 #endif
 789 }
 790
 791 static void __init setup_memory(void)
 792 {
 793         unsigned long bootmap_size;
 794         unsigned long start_pfn, end_pfn;
 795         int i;
 796
 797         /*
 798          * partially used pages are not usable - thus
 799          * we are rounding upwards:
 800          */
 801         start_pfn = PFN_UP(__pa(&_end));
 802         end_pfn = max_pfn = PFN_DOWN(memory_end);
 803
 804 #ifdef CONFIG_BLK_DEV_INITRD
 805         /*
 806          * Move the initrd in case the bitmap of the bootmem allocater
 807          * would overwrite it.
 808          */
 809
 810         if (INITRD_START && INITRD_SIZE) {
 811                 unsigned long bmap_size;
 812                 unsigned long start;
 813
 814                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 815                 bmap_size = PFN_PHYS(bmap_size);
 816
 817                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 818                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 819
 820 #ifdef CONFIG_CRASH_DUMP
 821                         if (OLDMEM_BASE) {
 822                                 /* Move initrd behind kdump oldmem */
 823                                 if (start + INITRD_SIZE > OLDMEM_BASE &&
 824                                     start < OLDMEM_BASE + OLDMEM_SIZE)
 825                                         start = OLDMEM_BASE + OLDMEM_SIZE;
 826                         }
 827 #endif
 828                         if (start + INITRD_SIZE > memory_end) {
 829                                 pr_err("initrd extends beyond end of "
 830                                        "memory (0x%08lx > 0x%08lx) "
 831                                        "disabling initrd\n",
 832                                        start + INITRD_SIZE, memory_end);
 833                                 INITRD_START = INITRD_SIZE = 0;
 834                         } else {
 835                                 pr_info("Moving initrd (0x%08lx -> "
 836                                         "0x%08lx, size: %ld)\n",
 837                                         INITRD_START, start, INITRD_SIZE);
 838                                 memmove((void *) start, (void *) INITRD_START,
 839                                         INITRD_SIZE);
 840                                 INITRD_START = start;
 841                         }
 842                 }
 843         }
 844 #endif
 845
 846         /*
 847          * Initialize the boot-time allocator
 848          */
 849         bootmap_size = init_bootmem(start_pfn, end_pfn);
 850
 851         /*
 852          * Register RAM areas with the bootmem allocator.
 853          */
 854
 855         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 856                 unsigned long start_chunk, end_chunk, pfn;
 857
 858                 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
 859                     memory_chunk[i].type != CHUNK_CRASHK)
 860                         continue;
 861                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 862                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 863                 end_chunk = min(end_chunk, end_pfn);
 864                 if (start_chunk >= end_chunk)
 865                         continue;
 866                 memblock_add_node(PFN_PHYS(start_chunk),
 867                                   PFN_PHYS(end_chunk - start_chunk), 0);
 868                 pfn = max(start_chunk, start_pfn);
 869                 for (; pfn < end_chunk; pfn++)
 870                         page_set_storage_key(PFN_PHYS(pfn),
 871                                              PAGE_DEFAULT_KEY, 0);
 872         }
 873
 874         psw_set_key(PAGE_DEFAULT_KEY);
 875
 876         free_bootmem_with_active_regions(0, max_pfn);
 877
 878         /*
 879          * Reserve memory used for lowcore/command line/kernel image.
 880          */
 881         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 882         reserve_bootmem((unsigned long)_stext,
 883                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 884                         BOOTMEM_DEFAULT);
 885         /*
 886          * Reserve the bootmem bitmap itself as well. We do this in two
 887          * steps (first step was init_bootmem()) because this catches
 888          * the (very unlikely) case of us accidentally initializing the
 889          * bootmem allocator with an invalid RAM area.
 890          */
 891         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 892                         BOOTMEM_DEFAULT);
 893
 894 #ifdef CONFIG_CRASH_DUMP
 895         if (crashk_res.start)
 896                 reserve_bootmem(crashk_res.start,
 897                                 crashk_res.end - crashk_res.start + 1,
 898                                 BOOTMEM_DEFAULT);
 899         if (is_kdump_kernel())
 900                 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
 901                                 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
 902 #endif
 903 #ifdef CONFIG_BLK_DEV_INITRD
 904         if (INITRD_START && INITRD_SIZE) {
 905                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 906                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 907                                         BOOTMEM_DEFAULT);
 908                         initrd_start = INITRD_START;
 909                         initrd_end = initrd_start + INITRD_SIZE;
 910                 } else {
 911                         pr_err("initrd extends beyond end of "
 912                                "memory (0x%08lx > 0x%08lx) "
 913                                "disabling initrd\n",
 914                                initrd_start + INITRD_SIZE, memory_end);
 915                         initrd_start = initrd_end = 0;
 916                 }
 917         }
 918 #endif
 919 }
 920
 921 /*
 922  * Setup hardware capabilities.
 923  */
 924 static void __init setup_hwcaps(void)
 925 {
 926         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 927         struct cpuid cpu_id;
 928         int i;
 929
 930         /*
 931          * The store facility list bits numbers as found in the principles
 932          * of operation are numbered with bit 1UL<<31 as number 0 to
 933          * bit 1UL<<0 as number 31.
 934          *   Bit 0: instructions named N3, "backported" to esa-mode
 935          *   Bit 2: z/Architecture mode is active
 936          *   Bit 7: the store-facility-list-extended facility is installed
 937          *   Bit 17: the message-security assist is installed
 938          *   Bit 19: the long-displacement facility is installed
 939          *   Bit 21: the extended-immediate facility is installed
 940          *   Bit 22: extended-translation facility 3 is installed
 941          *   Bit 30: extended-translation facility 3 enhancement facility
 942          * These get translated to:
 943          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 944          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 945          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 946          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 947          */
 948         for (i = 0; i < 6; i++)
 949                 if (test_facility(stfl_bits[i]))
 950                         elf_hwcap |= 1UL << i;
 951
 952         if (test_facility(22) && test_facility(30))
 953                 elf_hwcap |= HWCAP_S390_ETF3EH;
 954
 955         /*
 956          * Check for additional facilities with store-facility-list-extended.
 957          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 958          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 959          * as stored by stfl, bits 32-xxx contain additional facilities.
 960          * How many facility words are stored depends on the number of
 961          * doublewords passed to the instruction. The additional facilities
 962          * are:
 963          *   Bit 42: decimal floating point facility is installed
 964          *   Bit 44: perform floating point operation facility is installed
 965          * translated to:
 966          *   HWCAP_S390_DFP bit 6 (42 && 44).
 967          */
 968         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 969                 elf_hwcap |= HWCAP_S390_DFP;
 970
 971         /*
 972          * Huge page support HWCAP_S390_HPAGE is bit 7.
 973          */
 974         if (MACHINE_HAS_HPAGE)
 975                 elf_hwcap |= HWCAP_S390_HPAGE;
 976
 977 #if defined(CONFIG_64BIT)
 978         /*
 979          * 64-bit register support for 31-bit processes
 980          * HWCAP_S390_HIGH_GPRS is bit 9.
 981          */
 982         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 983 #endif
 984
 985         get_cpu_id(&cpu_id);
 986         switch (cpu_id.machine) {
 987         case 0x9672:
 988 #if !defined(CONFIG_64BIT)
 989         default:        /* Use "g5" as default for 31 bit kernels. */
 990 #endif
 991                 strcpy(elf_platform, "g5");
 992                 break;
 993         case 0x2064:
 994         case 0x2066:
 995 #if defined(CONFIG_64BIT)
 996         default:        /* Use "z900" as default for 64 bit kernels. */
 997 #endif
 998                 strcpy(elf_platform, "z900");
 999                 break;
1000         case 0x2084:
1001         case 0x2086:
1002                 strcpy(elf_platform, "z990");
1003                 break;
1004         case 0x2094:
1005         case 0x2096:
1006                 strcpy(elf_platform, "z9-109");
1007                 break;
1008         case 0x2097:
1009         case 0x2098:
1010                 strcpy(elf_platform, "z10");
1011                 break;
1012         case 0x2817:
1013         case 0x2818:
1014                 strcpy(elf_platform, "z196");
1015                 break;
1016         }
1017 }
1018
1019 /*
1020  * Setup function called from init/main.c just after the banner
1021  * was printed.
1022  */
1023
1024 void __init setup_arch(char **cmdline_p)
1025 {
1026         /*
1027          * print what head.S has found out about the machine
1028          */
1029 #ifndef CONFIG_64BIT
1030         if (MACHINE_IS_VM)
1031                 pr_info("Linux is running as a z/VM "
1032                         "guest operating system in 31-bit mode\n");
1033         else if (MACHINE_IS_LPAR)
1034                 pr_info("Linux is running natively in 31-bit mode\n");
1035         if (MACHINE_HAS_IEEE)
1036                 pr_info("The hardware system has IEEE compatible "
1037                         "floating point units\n");
1038         else
1039                 pr_info("The hardware system has no IEEE compatible "
1040                         "floating point units\n");
1041 #else /* CONFIG_64BIT */
1042         if (MACHINE_IS_VM)
1043                 pr_info("Linux is running as a z/VM "
1044                         "guest operating system in 64-bit mode\n");
1045         else if (MACHINE_IS_KVM)
1046                 pr_info("Linux is running under KVM in 64-bit mode\n");
1047         else if (MACHINE_IS_LPAR)
1048                 pr_info("Linux is running natively in 64-bit mode\n");
1049 #endif /* CONFIG_64BIT */
1050
1051         /* Have one command line that is parsed and saved in /proc/cmdline */
1052         /* boot_command_line has been already set up in early.c */
1053         *cmdline_p = boot_command_line;
1054
1055         ROOT_DEV = Root_RAM0;
1056
1057         init_mm.start_code = PAGE_OFFSET;
1058         init_mm.end_code = (unsigned long) &_etext;
1059         init_mm.end_data = (unsigned long) &_edata;
1060         init_mm.brk = (unsigned long) &_end;
1061
1062         if (MACHINE_HAS_MVCOS)
1063                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1064         else
1065                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1066
1067         parse_early_param();
1068
1069         os_info_init();
1070         setup_ipl();
1071         setup_memory_end();
1072         setup_addressing_mode();
1073         reserve_oldmem();
1074         reserve_crashkernel();
1075         setup_memory();
1076         setup_resources();
1077         setup_vmcoreinfo();
1078         setup_lowcore();
1079
1080         cpu_init();
1081         s390_init_cpu_topology();
1082
1083         /*
1084          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1085          */
1086         setup_hwcaps();
1087
1088         /*
1089          * Create kernel page tables and switch to virtual addressing.
1090          */
1091         paging_init();
1092
1093         /* Setup default console */
1094         conmode_default();
1095         set_preferred_console();
1096
1097         /* Setup zfcpdump support */
1098         setup_zfcpdump(console_devno);
1099 }