arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) IBM Corp. 1999,2010
   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/memblock.h>
  25 #include <linux/mm.h>
  26 #include <linux/stddef.h>
  27 #include <linux/unistd.h>
  28 #include <linux/ptrace.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 #include <linux/kexec.h>
  47 #include <linux/crash_dump.h>
  48 #include <linux/memory.h>
  49 #include <linux/compat.h>
  50
  51 #include <asm/ipl.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/system.h>
  54 #include <asm/smp.h>
  55 #include <asm/mmu_context.h>
  56 #include <asm/cpcmd.h>
  57 #include <asm/lowcore.h>
  58 #include <asm/irq.h>
  59 #include <asm/page.h>
  60 #include <asm/ptrace.h>
  61 #include <asm/sections.h>
  62 #include <asm/ebcdic.h>
  63 #include <asm/kvm_virtio.h>
  64 #include <asm/diag.h>
  65
  66 long psw_kernel_bits    = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
  67                           PSW_MASK_EA | PSW_MASK_BA;
  68 long psw_user_bits      = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
  69                           PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
  70                           PSW_MASK_PSTATE | PSW_ASC_HOME;
  71
  72 /*
  73  * User copy operations.
  74  */
  75 struct uaccess_ops uaccess;
  76 EXPORT_SYMBOL(uaccess);
  77
  78 /*
  79  * Machine setup..
  80  */
  81 unsigned int console_mode = 0;
  82 EXPORT_SYMBOL(console_mode);
  83
  84 unsigned int console_devno = -1;
  85 EXPORT_SYMBOL(console_devno);
  86
  87 unsigned int console_irq = -1;
  88 EXPORT_SYMBOL(console_irq);
  89
  90 unsigned long elf_hwcap = 0;
  91 char elf_platform[ELF_PLATFORM_SIZE];
  92
  93 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  94
  95 int __initdata memory_end_set;
  96 unsigned long __initdata memory_end;
  97
  98 unsigned long VMALLOC_START;
  99 EXPORT_SYMBOL(VMALLOC_START);
 100
 101 unsigned long VMALLOC_END;
 102 EXPORT_SYMBOL(VMALLOC_END);
 103
 104 struct page *vmemmap;
 105 EXPORT_SYMBOL(vmemmap);
 106
 107 /* An array with a pointer to the lowcore of every CPU. */
 108 struct _lowcore *lowcore_ptr[NR_CPUS];
 109 EXPORT_SYMBOL(lowcore_ptr);
 110
 111 /*
 112  * This is set up by the setup-routine at boot-time
 113  * for S390 need to find out, what we have to setup
 114  * using address 0x10400 ...
 115  */
 116
 117 #include <asm/setup.h>
 118
 119 /*
 120  * condev= and conmode= setup parameter.
 121  */
 122
 123 static int __init condev_setup(char *str)
 124 {
 125         int vdev;
 126
 127         vdev = simple_strtoul(str, &str, 0);
 128         if (vdev >= 0 && vdev < 65536) {
 129                 console_devno = vdev;
 130                 console_irq = -1;
 131         }
 132         return 1;
 133 }
 134
 135 __setup("condev=", condev_setup);
 136
 137 static void __init set_preferred_console(void)
 138 {
 139         if (MACHINE_IS_KVM)
 140                 add_preferred_console("hvc", 0, NULL);
 141         else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 142                 add_preferred_console("ttyS", 0, NULL);
 143         else if (CONSOLE_IS_3270)
 144                 add_preferred_console("tty3270", 0, NULL);
 145 }
 146
 147 static int __init conmode_setup(char *str)
 148 {
 149 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 150         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 151                 SET_CONSOLE_SCLP;
 152 #endif
 153 #if defined(CONFIG_TN3215_CONSOLE)
 154         if (strncmp(str, "3215", 5) == 0)
 155                 SET_CONSOLE_3215;
 156 #endif
 157 #if defined(CONFIG_TN3270_CONSOLE)
 158         if (strncmp(str, "3270", 5) == 0)
 159                 SET_CONSOLE_3270;
 160 #endif
 161         set_preferred_console();
 162         return 1;
 163 }
 164
 165 __setup("conmode=", conmode_setup);
 166
 167 static void __init conmode_default(void)
 168 {
 169         char query_buffer[1024];
 170         char *ptr;
 171
 172         if (MACHINE_IS_VM) {
 173                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 174                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 175                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 176                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 177                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 178                 ptr = strstr(query_buffer, "CONMODE");
 179                 /*
 180                  * Set the conmode to 3215 so that the device recognition
 181                  * will set the cu_type of the console to 3215. If the
 182                  * conmode is 3270 and we don't set it back then both
 183                  * 3215 and the 3270 driver will try to access the console
 184                  * device (3215 as console and 3270 as normal tty).
 185                  */
 186                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 187                 if (ptr == NULL) {
 188 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 189                         SET_CONSOLE_SCLP;
 190 #endif
 191                         return;
 192                 }
 193                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 194 #if defined(CONFIG_TN3270_CONSOLE)
 195                         SET_CONSOLE_3270;
 196 #elif defined(CONFIG_TN3215_CONSOLE)
 197                         SET_CONSOLE_3215;
 198 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 199                         SET_CONSOLE_SCLP;
 200 #endif
 201                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 202 #if defined(CONFIG_TN3215_CONSOLE)
 203                         SET_CONSOLE_3215;
 204 #elif defined(CONFIG_TN3270_CONSOLE)
 205                         SET_CONSOLE_3270;
 206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 207                         SET_CONSOLE_SCLP;
 208 #endif
 209                 }
 210         } else {
 211 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 212                 SET_CONSOLE_SCLP;
 213 #endif
 214         }
 215 }
 216
 217 #ifdef CONFIG_ZFCPDUMP
 218 static void __init setup_zfcpdump(unsigned int console_devno)
 219 {
 220         static char str[41];
 221
 222         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 223                 return;
 224         if (OLDMEM_BASE)
 225                 return;
 226         if (console_devno != -1)
 227                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 228                         ipl_info.data.fcp.dev_id.devno, console_devno);
 229         else
 230                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 231                         ipl_info.data.fcp.dev_id.devno);
 232         strcat(boot_command_line, str);
 233         console_loglevel = 2;
 234 }
 235 #else
 236 static inline void setup_zfcpdump(unsigned int console_devno) {}
 237 #endif /* CONFIG_ZFCPDUMP */
 238
 239  /*
 240  * Reboot, halt and power_off stubs. They just call _machine_restart,
 241  * _machine_halt or _machine_power_off.
 242  */
 243
 244 void machine_restart(char *command)
 245 {
 246         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 247                 /*
 248                  * Only unblank the console if we are called in enabled
 249                  * context or a bust_spinlocks cleared the way for us.
 250                  */
 251                 console_unblank();
 252         _machine_restart(command);
 253 }
 254
 255 void machine_halt(void)
 256 {
 257         if (!in_interrupt() || oops_in_progress)
 258                 /*
 259                  * Only unblank the console if we are called in enabled
 260                  * context or a bust_spinlocks cleared the way for us.
 261                  */
 262                 console_unblank();
 263         _machine_halt();
 264 }
 265
 266 void machine_power_off(void)
 267 {
 268         if (!in_interrupt() || 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_power_off();
 275 }
 276
 277 /*
 278  * Dummy power off function.
 279  */
 280 void (*pm_power_off)(void) = machine_power_off;
 281
 282 static int __init early_parse_mem(char *p)
 283 {
 284         memory_end = memparse(p, &p);
 285         memory_end_set = 1;
 286         return 0;
 287 }
 288 early_param("mem", early_parse_mem);
 289
 290 static int __init parse_vmalloc(char *arg)
 291 {
 292         if (!arg)
 293                 return -EINVAL;
 294         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
 295         return 0;
 296 }
 297 early_param("vmalloc", parse_vmalloc);
 298
 299 unsigned int user_mode = HOME_SPACE_MODE;
 300 EXPORT_SYMBOL_GPL(user_mode);
 301
 302 static int set_amode_primary(void)
 303 {
 304         psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
 305         psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
 306 #ifdef CONFIG_COMPAT
 307         psw32_user_bits =
 308                 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
 309 #endif
 310
 311         if (MACHINE_HAS_MVCOS) {
 312                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 313                 return 1;
 314         } else {
 315                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 316                 return 0;
 317         }
 318 }
 319
 320 /*
 321  * Switch kernel/user addressing modes?
 322  */
 323 static int __init early_parse_switch_amode(char *p)
 324 {
 325         user_mode = PRIMARY_SPACE_MODE;
 326         return 0;
 327 }
 328 early_param("switch_amode", early_parse_switch_amode);
 329
 330 static int __init early_parse_user_mode(char *p)
 331 {
 332         if (p && strcmp(p, "primary") == 0)
 333                 user_mode = PRIMARY_SPACE_MODE;
 334         else if (!p || strcmp(p, "home") == 0)
 335                 user_mode = HOME_SPACE_MODE;
 336         else
 337                 return 1;
 338         return 0;
 339 }
 340 early_param("user_mode", early_parse_user_mode);
 341
 342 static void setup_addressing_mode(void)
 343 {
 344         if (user_mode == PRIMARY_SPACE_MODE) {
 345                 if (set_amode_primary())
 346                         pr_info("Address spaces switched, "
 347                                 "mvcos available\n");
 348                 else
 349                         pr_info("Address spaces switched, "
 350                                 "mvcos not available\n");
 351         }
 352 }
 353
 354 static void __init
 355 setup_lowcore(void)
 356 {
 357         struct _lowcore *lc;
 358
 359         /*
 360          * Setup lowcore for boot cpu
 361          */
 362         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 363         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 364         lc->restart_psw.mask = psw_kernel_bits;
 365         lc->restart_psw.addr =
 366                 PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
 367         lc->external_new_psw.mask = psw_kernel_bits |
 368                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 369         lc->external_new_psw.addr =
 370                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 371         lc->svc_new_psw.mask = psw_kernel_bits |
 372                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 373         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 374         lc->program_new_psw.mask = psw_kernel_bits |
 375                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 376         lc->program_new_psw.addr =
 377                 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
 378         lc->mcck_new_psw.mask = psw_kernel_bits;
 379         lc->mcck_new_psw.addr =
 380                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 381         lc->io_new_psw.mask = psw_kernel_bits |
 382                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 383         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 384         lc->clock_comparator = -1ULL;
 385         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 386         lc->async_stack = (unsigned long)
 387                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 388         lc->panic_stack = (unsigned long)
 389                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 390         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 391         lc->thread_info = (unsigned long) &init_thread_union;
 392         lc->machine_flags = S390_lowcore.machine_flags;
 393         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 394         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 395                MAX_FACILITY_BIT/8);
 396 #ifndef CONFIG_64BIT
 397         if (MACHINE_HAS_IEEE) {
 398                 lc->extended_save_area_addr = (__u32)
 399                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 400                 /* enable extended save area */
 401                 __ctl_set_bit(14, 29);
 402         }
 403 #else
 404         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 405 #endif
 406         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 407         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 408         lc->exit_timer = S390_lowcore.exit_timer;
 409         lc->user_timer = S390_lowcore.user_timer;
 410         lc->system_timer = S390_lowcore.system_timer;
 411         lc->steal_timer = S390_lowcore.steal_timer;
 412         lc->last_update_timer = S390_lowcore.last_update_timer;
 413         lc->last_update_clock = S390_lowcore.last_update_clock;
 414         lc->ftrace_func = S390_lowcore.ftrace_func;
 415         set_prefix((u32)(unsigned long) lc);
 416         lowcore_ptr[0] = lc;
 417 }
 418
 419 static struct resource code_resource = {
 420         .name  = "Kernel code",
 421         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 422 };
 423
 424 static struct resource data_resource = {
 425         .name = "Kernel data",
 426         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 427 };
 428
 429 static struct resource bss_resource = {
 430         .name = "Kernel bss",
 431         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 432 };
 433
 434 static struct resource __initdata *standard_resources[] = {
 435         &code_resource,
 436         &data_resource,
 437         &bss_resource,
 438 };
 439
 440 static void __init setup_resources(void)
 441 {
 442         struct resource *res, *std_res, *sub_res;
 443         int i, j;
 444
 445         code_resource.start = (unsigned long) &_text;
 446         code_resource.end = (unsigned long) &_etext - 1;
 447         data_resource.start = (unsigned long) &_etext;
 448         data_resource.end = (unsigned long) &_edata - 1;
 449         bss_resource.start = (unsigned long) &__bss_start;
 450         bss_resource.end = (unsigned long) &__bss_stop - 1;
 451
 452         for (i = 0; i < MEMORY_CHUNKS; i++) {
 453                 if (!memory_chunk[i].size)
 454                         continue;
 455                 if (memory_chunk[i].type == CHUNK_OLDMEM ||
 456                     memory_chunk[i].type == CHUNK_CRASHK)
 457                         continue;
 458                 res = alloc_bootmem_low(sizeof(*res));
 459                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 460                 switch (memory_chunk[i].type) {
 461                 case CHUNK_READ_WRITE:
 462                 case CHUNK_CRASHK:
 463                         res->name = "System RAM";
 464                         break;
 465                 case CHUNK_READ_ONLY:
 466                         res->name = "System ROM";
 467                         res->flags |= IORESOURCE_READONLY;
 468                         break;
 469                 default:
 470                         res->name = "reserved";
 471                 }
 472                 res->start = memory_chunk[i].addr;
 473                 res->end = res->start + memory_chunk[i].size - 1;
 474                 request_resource(&iomem_resource, res);
 475
 476                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 477                         std_res = standard_resources[j];
 478                         if (std_res->start < res->start ||
 479                             std_res->start > res->end)
 480                                 continue;
 481                         if (std_res->end > res->end) {
 482                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 483                                 *sub_res = *std_res;
 484                                 sub_res->end = res->end;
 485                                 std_res->start = res->end + 1;
 486                                 request_resource(res, sub_res);
 487                         } else {
 488                                 request_resource(res, std_res);
 489                         }
 490                 }
 491         }
 492 }
 493
 494 unsigned long real_memory_size;
 495 EXPORT_SYMBOL_GPL(real_memory_size);
 496
 497 static void __init setup_memory_end(void)
 498 {
 499         unsigned long vmax, vmalloc_size, tmp;
 500         int i;
 501
 502
 503 #ifdef CONFIG_ZFCPDUMP
 504         if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
 505                 memory_end = ZFCPDUMP_HSA_SIZE;
 506                 memory_end_set = 1;
 507         }
 508 #endif
 509         real_memory_size = 0;
 510         memory_end &= PAGE_MASK;
 511
 512         /*
 513          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 514          * extra checks that HOLES_IN_ZONE would require.
 515          */
 516         for (i = 0; i < MEMORY_CHUNKS; i++) {
 517                 unsigned long start, end;
 518                 struct mem_chunk *chunk;
 519                 unsigned long align;
 520
 521                 chunk = &memory_chunk[i];
 522                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 523                 start = (chunk->addr + align - 1) & ~(align - 1);
 524                 end = (chunk->addr + chunk->size) & ~(align - 1);
 525                 if (start >= end)
 526                         memset(chunk, 0, sizeof(*chunk));
 527                 else {
 528                         chunk->addr = start;
 529                         chunk->size = end - start;
 530                 }
 531                 real_memory_size = max(real_memory_size,
 532                                        chunk->addr + chunk->size);
 533         }
 534
 535         /* Choose kernel address space layout: 2, 3, or 4 levels. */
 536 #ifdef CONFIG_64BIT
 537         vmalloc_size = VMALLOC_END ?: 128UL << 30;
 538         tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
 539         tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
 540         if (tmp <= (1UL << 42))
 541                 vmax = 1UL << 42;       /* 3-level kernel page table */
 542         else
 543                 vmax = 1UL << 53;       /* 4-level kernel page table */
 544 #else
 545         vmalloc_size = VMALLOC_END ?: 96UL << 20;
 546         vmax = 1UL << 31;               /* 2-level kernel page table */
 547 #endif
 548         /* vmalloc area is at the end of the kernel address space. */
 549         VMALLOC_END = vmax;
 550         VMALLOC_START = vmax - vmalloc_size;
 551
 552         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 553         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 554         tmp = VMALLOC_START - tmp * sizeof(struct page);
 555         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 556         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 557         vmemmap = (struct page *) tmp;
 558
 559         /* Take care that memory_end is set and <= vmemmap */
 560         memory_end = min(memory_end ?: real_memory_size, tmp);
 561
 562         /* Fixup memory chunk array to fit into 0..memory_end */
 563         for (i = 0; i < MEMORY_CHUNKS; i++) {
 564                 struct mem_chunk *chunk = &memory_chunk[i];
 565
 566                 if (chunk->addr >= memory_end) {
 567                         memset(chunk, 0, sizeof(*chunk));
 568                         continue;
 569                 }
 570                 if (chunk->addr + chunk->size > memory_end)
 571                         chunk->size = memory_end - chunk->addr;
 572         }
 573 }
 574
 575 void *restart_stack __attribute__((__section__(".data")));
 576
 577 /*
 578  * Setup new PSW and allocate stack for PSW restart interrupt
 579  */
 580 static void __init setup_restart_psw(void)
 581 {
 582         psw_t psw;
 583
 584         restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
 585         restart_stack += ASYNC_SIZE;
 586
 587         /*
 588          * Setup restart PSW for absolute zero lowcore. This is necesary
 589          * if PSW restart is done on an offline CPU that has lowcore zero
 590          */
 591         psw.mask = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
 592         psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
 593         copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
 594 }
 595
 596 static void __init setup_vmcoreinfo(void)
 597 {
 598 #ifdef CONFIG_KEXEC
 599         unsigned long ptr = paddr_vmcoreinfo_note();
 600
 601         copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
 602 #endif
 603 }
 604
 605 #ifdef CONFIG_CRASH_DUMP
 606
 607 /*
 608  * Find suitable location for crashkernel memory
 609  */
 610 static unsigned long __init find_crash_base(unsigned long crash_size,
 611                                             char **msg)
 612 {
 613         unsigned long crash_base;
 614         struct mem_chunk *chunk;
 615         int i;
 616
 617         if (memory_chunk[0].size < crash_size) {
 618                 *msg = "first memory chunk must be at least crashkernel size";
 619                 return 0;
 620         }
 621         if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
 622                 return OLDMEM_BASE;
 623
 624         for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
 625                 chunk = &memory_chunk[i];
 626                 if (chunk->size == 0)
 627                         continue;
 628                 if (chunk->type != CHUNK_READ_WRITE)
 629                         continue;
 630                 if (chunk->size < crash_size)
 631                         continue;
 632                 crash_base = (chunk->addr + chunk->size) - crash_size;
 633                 if (crash_base < crash_size)
 634                         continue;
 635                 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
 636                         continue;
 637                 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
 638                         continue;
 639                 return crash_base;
 640         }
 641         *msg = "no suitable area found";
 642         return 0;
 643 }
 644
 645 /*
 646  * Check if crash_base and crash_size is valid
 647  */
 648 static int __init verify_crash_base(unsigned long crash_base,
 649                                     unsigned long crash_size,
 650                                     char **msg)
 651 {
 652         struct mem_chunk *chunk;
 653         int i;
 654
 655         /*
 656          * Because we do the swap to zero, we must have at least 'crash_size'
 657          * bytes free space before crash_base
 658          */
 659         if (crash_size > crash_base) {
 660                 *msg = "crashkernel offset must be greater than size";
 661                 return -EINVAL;
 662         }
 663
 664         /* First memory chunk must be at least crash_size */
 665         if (memory_chunk[0].size < crash_size) {
 666                 *msg = "first memory chunk must be at least crashkernel size";
 667                 return -EINVAL;
 668         }
 669         /* Check if we fit into the respective memory chunk */
 670         for (i = 0; i < MEMORY_CHUNKS; i++) {
 671                 chunk = &memory_chunk[i];
 672                 if (chunk->size == 0)
 673                         continue;
 674                 if (crash_base < chunk->addr)
 675                         continue;
 676                 if (crash_base >= chunk->addr + chunk->size)
 677                         continue;
 678                 /* we have found the memory chunk */
 679                 if (crash_base + crash_size > chunk->addr + chunk->size) {
 680                         *msg = "selected memory chunk is too small for "
 681                                 "crashkernel memory";
 682                         return -EINVAL;
 683                 }
 684                 return 0;
 685         }
 686         *msg = "invalid memory range specified";
 687         return -EINVAL;
 688 }
 689
 690 /*
 691  * Reserve kdump memory by creating a memory hole in the mem_chunk array
 692  */
 693 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
 694                                          int type)
 695 {
 696         create_mem_hole(memory_chunk, addr, size, type);
 697 }
 698
 699 /*
 700  * When kdump is enabled, we have to ensure that no memory from
 701  * the area [0 - crashkernel memory size] and
 702  * [crashk_res.start - crashk_res.end] is set offline.
 703  */
 704 static int kdump_mem_notifier(struct notifier_block *nb,
 705                               unsigned long action, void *data)
 706 {
 707         struct memory_notify *arg = data;
 708
 709         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 710                 return NOTIFY_BAD;
 711         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 712                 return NOTIFY_OK;
 713         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 714                 return NOTIFY_OK;
 715         return NOTIFY_BAD;
 716 }
 717
 718 static struct notifier_block kdump_mem_nb = {
 719         .notifier_call = kdump_mem_notifier,
 720 };
 721
 722 #endif
 723
 724 /*
 725  * Make sure that oldmem, where the dump is stored, is protected
 726  */
 727 static void reserve_oldmem(void)
 728 {
 729 #ifdef CONFIG_CRASH_DUMP
 730         if (!OLDMEM_BASE)
 731                 return;
 732
 733         reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
 734         reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
 735                               CHUNK_OLDMEM);
 736         if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
 737                 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
 738         else
 739                 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
 740 #endif
 741 }
 742
 743 /*
 744  * Reserve memory for kdump kernel to be loaded with kexec
 745  */
 746 static void __init reserve_crashkernel(void)
 747 {
 748 #ifdef CONFIG_CRASH_DUMP
 749         unsigned long long crash_base, crash_size;
 750         char *msg;
 751         int rc;
 752
 753         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 754                                &crash_base);
 755         if (rc || crash_size == 0)
 756                 return;
 757         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 758         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 759         if (register_memory_notifier(&kdump_mem_nb))
 760                 return;
 761         if (!crash_base)
 762                 crash_base = find_crash_base(crash_size, &msg);
 763         if (!crash_base) {
 764                 pr_info("crashkernel reservation failed: %s\n", msg);
 765                 unregister_memory_notifier(&kdump_mem_nb);
 766                 return;
 767         }
 768         if (verify_crash_base(crash_base, crash_size, &msg)) {
 769                 pr_info("crashkernel reservation failed: %s\n", msg);
 770                 unregister_memory_notifier(&kdump_mem_nb);
 771                 return;
 772         }
 773         if (!OLDMEM_BASE && MACHINE_IS_VM)
 774                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 775         crashk_res.start = crash_base;
 776         crashk_res.end = crash_base + crash_size - 1;
 777         insert_resource(&iomem_resource, &crashk_res);
 778         reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
 779         pr_info("Reserving %lluMB of memory at %lluMB "
 780                 "for crashkernel (System RAM: %luMB)\n",
 781                 crash_size >> 20, crash_base >> 20, memory_end >> 20);
 782 #endif
 783 }
 784
 785 static void __init
 786 setup_memory(void)
 787 {
 788         unsigned long bootmap_size;
 789         unsigned long start_pfn, end_pfn;
 790         int i;
 791
 792         /*
 793          * partially used pages are not usable - thus
 794          * we are rounding upwards:
 795          */
 796         start_pfn = PFN_UP(__pa(&_end));
 797         end_pfn = max_pfn = PFN_DOWN(memory_end);
 798
 799 #ifdef CONFIG_BLK_DEV_INITRD
 800         /*
 801          * Move the initrd in case the bitmap of the bootmem allocater
 802          * would overwrite it.
 803          */
 804
 805         if (INITRD_START && INITRD_SIZE) {
 806                 unsigned long bmap_size;
 807                 unsigned long start;
 808
 809                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 810                 bmap_size = PFN_PHYS(bmap_size);
 811
 812                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 813                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 814
 815 #ifdef CONFIG_CRASH_DUMP
 816                         if (OLDMEM_BASE) {
 817                                 /* Move initrd behind kdump oldmem */
 818                                 if (start + INITRD_SIZE > OLDMEM_BASE &&
 819                                     start < OLDMEM_BASE + OLDMEM_SIZE)
 820                                         start = OLDMEM_BASE + OLDMEM_SIZE;
 821                         }
 822 #endif
 823                         if (start + INITRD_SIZE > memory_end) {
 824                                 pr_err("initrd extends beyond end of "
 825                                        "memory (0x%08lx > 0x%08lx) "
 826                                        "disabling initrd\n",
 827                                        start + INITRD_SIZE, memory_end);
 828                                 INITRD_START = INITRD_SIZE = 0;
 829                         } else {
 830                                 pr_info("Moving initrd (0x%08lx -> "
 831                                         "0x%08lx, size: %ld)\n",
 832                                         INITRD_START, start, INITRD_SIZE);
 833                                 memmove((void *) start, (void *) INITRD_START,
 834                                         INITRD_SIZE);
 835                                 INITRD_START = start;
 836                         }
 837                 }
 838         }
 839 #endif
 840
 841         /*
 842          * Initialize the boot-time allocator
 843          */
 844         bootmap_size = init_bootmem(start_pfn, end_pfn);
 845
 846         /*
 847          * Register RAM areas with the bootmem allocator.
 848          */
 849
 850         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 851                 unsigned long start_chunk, end_chunk, pfn;
 852
 853                 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
 854                     memory_chunk[i].type != CHUNK_CRASHK)
 855                         continue;
 856                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 857                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 858                 end_chunk = min(end_chunk, end_pfn);
 859                 if (start_chunk >= end_chunk)
 860                         continue;
 861                 memblock_add_node(PFN_PHYS(start_chunk),
 862                                   PFN_PHYS(end_chunk - start_chunk), 0);
 863                 pfn = max(start_chunk, start_pfn);
 864                 for (; pfn < end_chunk; pfn++)
 865                         page_set_storage_key(PFN_PHYS(pfn),
 866                                              PAGE_DEFAULT_KEY, 0);
 867         }
 868
 869         psw_set_key(PAGE_DEFAULT_KEY);
 870
 871         free_bootmem_with_active_regions(0, max_pfn);
 872
 873         /*
 874          * Reserve memory used for lowcore/command line/kernel image.
 875          */
 876         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 877         reserve_bootmem((unsigned long)_stext,
 878                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 879                         BOOTMEM_DEFAULT);
 880         /*
 881          * Reserve the bootmem bitmap itself as well. We do this in two
 882          * steps (first step was init_bootmem()) because this catches
 883          * the (very unlikely) case of us accidentally initializing the
 884          * bootmem allocator with an invalid RAM area.
 885          */
 886         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 887                         BOOTMEM_DEFAULT);
 888
 889 #ifdef CONFIG_CRASH_DUMP
 890         if (crashk_res.start)
 891                 reserve_bootmem(crashk_res.start,
 892                                 crashk_res.end - crashk_res.start + 1,
 893                                 BOOTMEM_DEFAULT);
 894         if (is_kdump_kernel())
 895                 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
 896                                 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
 897 #endif
 898 #ifdef CONFIG_BLK_DEV_INITRD
 899         if (INITRD_START && INITRD_SIZE) {
 900                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 901                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 902                                         BOOTMEM_DEFAULT);
 903                         initrd_start = INITRD_START;
 904                         initrd_end = initrd_start + INITRD_SIZE;
 905                 } else {
 906                         pr_err("initrd extends beyond end of "
 907                                "memory (0x%08lx > 0x%08lx) "
 908                                "disabling initrd\n",
 909                                initrd_start + INITRD_SIZE, memory_end);
 910                         initrd_start = initrd_end = 0;
 911                 }
 912         }
 913 #endif
 914 }
 915
 916 /*
 917  * Setup hardware capabilities.
 918  */
 919 static void __init setup_hwcaps(void)
 920 {
 921         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 922         struct cpuid cpu_id;
 923         int i;
 924
 925         /*
 926          * The store facility list bits numbers as found in the principles
 927          * of operation are numbered with bit 1UL<<31 as number 0 to
 928          * bit 1UL<<0 as number 31.
 929          *   Bit 0: instructions named N3, "backported" to esa-mode
 930          *   Bit 2: z/Architecture mode is active
 931          *   Bit 7: the store-facility-list-extended facility is installed
 932          *   Bit 17: the message-security assist is installed
 933          *   Bit 19: the long-displacement facility is installed
 934          *   Bit 21: the extended-immediate facility is installed
 935          *   Bit 22: extended-translation facility 3 is installed
 936          *   Bit 30: extended-translation facility 3 enhancement facility
 937          * These get translated to:
 938          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 939          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 940          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 941          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 942          */
 943         for (i = 0; i < 6; i++)
 944                 if (test_facility(stfl_bits[i]))
 945                         elf_hwcap |= 1UL << i;
 946
 947         if (test_facility(22) && test_facility(30))
 948                 elf_hwcap |= HWCAP_S390_ETF3EH;
 949
 950         /*
 951          * Check for additional facilities with store-facility-list-extended.
 952          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 953          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 954          * as stored by stfl, bits 32-xxx contain additional facilities.
 955          * How many facility words are stored depends on the number of
 956          * doublewords passed to the instruction. The additional facilities
 957          * are:
 958          *   Bit 42: decimal floating point facility is installed
 959          *   Bit 44: perform floating point operation facility is installed
 960          * translated to:
 961          *   HWCAP_S390_DFP bit 6 (42 && 44).
 962          */
 963         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 964                 elf_hwcap |= HWCAP_S390_DFP;
 965
 966         /*
 967          * Huge page support HWCAP_S390_HPAGE is bit 7.
 968          */
 969         if (MACHINE_HAS_HPAGE)
 970                 elf_hwcap |= HWCAP_S390_HPAGE;
 971
 972         /*
 973          * 64-bit register support for 31-bit processes
 974          * HWCAP_S390_HIGH_GPRS is bit 9.
 975          */
 976         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 977
 978         get_cpu_id(&cpu_id);
 979         switch (cpu_id.machine) {
 980         case 0x9672:
 981 #if !defined(CONFIG_64BIT)
 982         default:        /* Use "g5" as default for 31 bit kernels. */
 983 #endif
 984                 strcpy(elf_platform, "g5");
 985                 break;
 986         case 0x2064:
 987         case 0x2066:
 988 #if defined(CONFIG_64BIT)
 989         default:        /* Use "z900" as default for 64 bit kernels. */
 990 #endif
 991                 strcpy(elf_platform, "z900");
 992                 break;
 993         case 0x2084:
 994         case 0x2086:
 995                 strcpy(elf_platform, "z990");
 996                 break;
 997         case 0x2094:
 998         case 0x2096:
 999                 strcpy(elf_platform, "z9-109");
1000                 break;
1001         case 0x2097:
1002         case 0x2098:
1003                 strcpy(elf_platform, "z10");
1004                 break;
1005         case 0x2817:
1006         case 0x2818:
1007                 strcpy(elf_platform, "z196");
1008                 break;
1009         }
1010 }
1011
1012 /*
1013  * Setup function called from init/main.c just after the banner
1014  * was printed.
1015  */
1016
1017 void __init
1018 setup_arch(char **cmdline_p)
1019 {
1020         /*
1021          * print what head.S has found out about the machine
1022          */
1023 #ifndef CONFIG_64BIT
1024         if (MACHINE_IS_VM)
1025                 pr_info("Linux is running as a z/VM "
1026                         "guest operating system in 31-bit mode\n");
1027         else if (MACHINE_IS_LPAR)
1028                 pr_info("Linux is running natively in 31-bit mode\n");
1029         if (MACHINE_HAS_IEEE)
1030                 pr_info("The hardware system has IEEE compatible "
1031                         "floating point units\n");
1032         else
1033                 pr_info("The hardware system has no IEEE compatible "
1034                         "floating point units\n");
1035 #else /* CONFIG_64BIT */
1036         if (MACHINE_IS_VM)
1037                 pr_info("Linux is running as a z/VM "
1038                         "guest operating system in 64-bit mode\n");
1039         else if (MACHINE_IS_KVM)
1040                 pr_info("Linux is running under KVM in 64-bit mode\n");
1041         else if (MACHINE_IS_LPAR)
1042                 pr_info("Linux is running natively in 64-bit mode\n");
1043 #endif /* CONFIG_64BIT */
1044
1045         /* Have one command line that is parsed and saved in /proc/cmdline */
1046         /* boot_command_line has been already set up in early.c */
1047         *cmdline_p = boot_command_line;
1048
1049         ROOT_DEV = Root_RAM0;
1050
1051         init_mm.start_code = PAGE_OFFSET;
1052         init_mm.end_code = (unsigned long) &_etext;
1053         init_mm.end_data = (unsigned long) &_edata;
1054         init_mm.brk = (unsigned long) &_end;
1055
1056         if (MACHINE_HAS_MVCOS)
1057                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1058         else
1059                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1060
1061         parse_early_param();
1062
1063         setup_ipl();
1064         setup_memory_end();
1065         setup_addressing_mode();
1066         reserve_oldmem();
1067         reserve_crashkernel();
1068         setup_memory();
1069         setup_resources();
1070         setup_vmcoreinfo();
1071         setup_restart_psw();
1072         setup_lowcore();
1073
1074         cpu_init();
1075         s390_init_cpu_topology();
1076
1077         /*
1078          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1079          */
1080         setup_hwcaps();
1081
1082         /*
1083          * Create kernel page tables and switch to virtual addressing.
1084          */
1085         paging_init();
1086
1087         /* Setup default console */
1088         conmode_default();
1089         set_preferred_console();
1090
1091         /* Setup zfcpdump support */
1092         setup_zfcpdump(console_devno);
1093 }