arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) IBM Corp. 1999,2012
   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/facility.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 #include <asm/os_info.h>
  66 #include "entry.h"
  67
  68 long psw_kernel_bits    = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
  69                           PSW_MASK_EA | PSW_MASK_BA;
  70 long psw_user_bits      = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
  71                           PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
  72                           PSW_MASK_PSTATE | PSW_ASC_HOME;
  73
  74 /*
  75  * User copy operations.
  76  */
  77 struct uaccess_ops uaccess;
  78 EXPORT_SYMBOL(uaccess);
  79
  80 /*
  81  * Machine setup..
  82  */
  83 unsigned int console_mode = 0;
  84 EXPORT_SYMBOL(console_mode);
  85
  86 unsigned int console_devno = -1;
  87 EXPORT_SYMBOL(console_devno);
  88
  89 unsigned int console_irq = -1;
  90 EXPORT_SYMBOL(console_irq);
  91
  92 unsigned long elf_hwcap = 0;
  93 char elf_platform[ELF_PLATFORM_SIZE];
  94
  95 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  96
  97 int __initdata memory_end_set;
  98 unsigned long __initdata memory_end;
  99
 100 unsigned long VMALLOC_START;
 101 EXPORT_SYMBOL(VMALLOC_START);
 102
 103 unsigned long VMALLOC_END;
 104 EXPORT_SYMBOL(VMALLOC_END);
 105
 106 struct page *vmemmap;
 107 EXPORT_SYMBOL(vmemmap);
 108
 109 /* An array with a pointer to the lowcore of every CPU. */
 110 struct _lowcore *lowcore_ptr[NR_CPUS];
 111 EXPORT_SYMBOL(lowcore_ptr);
 112
 113 /*
 114  * This is set up by the setup-routine at boot-time
 115  * for S390 need to find out, what we have to setup
 116  * using address 0x10400 ...
 117  */
 118
 119 #include <asm/setup.h>
 120
 121 /*
 122  * condev= and conmode= setup parameter.
 123  */
 124
 125 static int __init condev_setup(char *str)
 126 {
 127         int vdev;
 128
 129         vdev = simple_strtoul(str, &str, 0);
 130         if (vdev >= 0 && vdev < 65536) {
 131                 console_devno = vdev;
 132                 console_irq = -1;
 133         }
 134         return 1;
 135 }
 136
 137 __setup("condev=", condev_setup);
 138
 139 static void __init set_preferred_console(void)
 140 {
 141         if (MACHINE_IS_KVM)
 142                 add_preferred_console("hvc", 0, NULL);
 143         else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 144                 add_preferred_console("ttyS", 0, NULL);
 145         else if (CONSOLE_IS_3270)
 146                 add_preferred_console("tty3270", 0, NULL);
 147 }
 148
 149 static int __init conmode_setup(char *str)
 150 {
 151 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 152         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 153                 SET_CONSOLE_SCLP;
 154 #endif
 155 #if defined(CONFIG_TN3215_CONSOLE)
 156         if (strncmp(str, "3215", 5) == 0)
 157                 SET_CONSOLE_3215;
 158 #endif
 159 #if defined(CONFIG_TN3270_CONSOLE)
 160         if (strncmp(str, "3270", 5) == 0)
 161                 SET_CONSOLE_3270;
 162 #endif
 163         set_preferred_console();
 164         return 1;
 165 }
 166
 167 __setup("conmode=", conmode_setup);
 168
 169 static void __init conmode_default(void)
 170 {
 171         char query_buffer[1024];
 172         char *ptr;
 173
 174         if (MACHINE_IS_VM) {
 175                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 176                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 177                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 178                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 179                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 180                 ptr = strstr(query_buffer, "CONMODE");
 181                 /*
 182                  * Set the conmode to 3215 so that the device recognition
 183                  * will set the cu_type of the console to 3215. If the
 184                  * conmode is 3270 and we don't set it back then both
 185                  * 3215 and the 3270 driver will try to access the console
 186                  * device (3215 as console and 3270 as normal tty).
 187                  */
 188                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 189                 if (ptr == NULL) {
 190 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 191                         SET_CONSOLE_SCLP;
 192 #endif
 193                         return;
 194                 }
 195                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 196 #if defined(CONFIG_TN3270_CONSOLE)
 197                         SET_CONSOLE_3270;
 198 #elif defined(CONFIG_TN3215_CONSOLE)
 199                         SET_CONSOLE_3215;
 200 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 201                         SET_CONSOLE_SCLP;
 202 #endif
 203                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 204 #if defined(CONFIG_TN3215_CONSOLE)
 205                         SET_CONSOLE_3215;
 206 #elif defined(CONFIG_TN3270_CONSOLE)
 207                         SET_CONSOLE_3270;
 208 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 209                         SET_CONSOLE_SCLP;
 210 #endif
 211                 }
 212         } else {
 213 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 214                 SET_CONSOLE_SCLP;
 215 #endif
 216         }
 217 }
 218
 219 #ifdef CONFIG_ZFCPDUMP
 220 static void __init setup_zfcpdump(unsigned int console_devno)
 221 {
 222         static char str[41];
 223
 224         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 225                 return;
 226         if (OLDMEM_BASE)
 227                 return;
 228         if (console_devno != -1)
 229                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 230                         ipl_info.data.fcp.dev_id.devno, console_devno);
 231         else
 232                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 233                         ipl_info.data.fcp.dev_id.devno);
 234         strcat(boot_command_line, str);
 235         console_loglevel = 2;
 236 }
 237 #else
 238 static inline void setup_zfcpdump(unsigned int console_devno) {}
 239 #endif /* CONFIG_ZFCPDUMP */
 240
 241  /*
 242  * Reboot, halt and power_off stubs. They just call _machine_restart,
 243  * _machine_halt or _machine_power_off.
 244  */
 245
 246 void machine_restart(char *command)
 247 {
 248         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 249                 /*
 250                  * Only unblank the console if we are called in enabled
 251                  * context or a bust_spinlocks cleared the way for us.
 252                  */
 253                 console_unblank();
 254         _machine_restart(command);
 255 }
 256
 257 void machine_halt(void)
 258 {
 259         if (!in_interrupt() || oops_in_progress)
 260                 /*
 261                  * Only unblank the console if we are called in enabled
 262                  * context or a bust_spinlocks cleared the way for us.
 263                  */
 264                 console_unblank();
 265         _machine_halt();
 266 }
 267
 268 void machine_power_off(void)
 269 {
 270         if (!in_interrupt() || oops_in_progress)
 271                 /*
 272                  * Only unblank the console if we are called in enabled
 273                  * context or a bust_spinlocks cleared the way for us.
 274                  */
 275                 console_unblank();
 276         _machine_power_off();
 277 }
 278
 279 /*
 280  * Dummy power off function.
 281  */
 282 void (*pm_power_off)(void) = machine_power_off;
 283
 284 static int __init early_parse_mem(char *p)
 285 {
 286         memory_end = memparse(p, &p);
 287         memory_end_set = 1;
 288         return 0;
 289 }
 290 early_param("mem", early_parse_mem);
 291
 292 static int __init parse_vmalloc(char *arg)
 293 {
 294         if (!arg)
 295                 return -EINVAL;
 296         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
 297         return 0;
 298 }
 299 early_param("vmalloc", parse_vmalloc);
 300
 301 unsigned int user_mode = HOME_SPACE_MODE;
 302 EXPORT_SYMBOL_GPL(user_mode);
 303
 304 static int set_amode_primary(void)
 305 {
 306         psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
 307         psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
 308 #ifdef CONFIG_COMPAT
 309         psw32_user_bits =
 310                 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
 311 #endif
 312
 313         if (MACHINE_HAS_MVCOS) {
 314                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 315                 return 1;
 316         } else {
 317                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 318                 return 0;
 319         }
 320 }
 321
 322 /*
 323  * Switch kernel/user addressing modes?
 324  */
 325 static int __init early_parse_switch_amode(char *p)
 326 {
 327         user_mode = PRIMARY_SPACE_MODE;
 328         return 0;
 329 }
 330 early_param("switch_amode", early_parse_switch_amode);
 331
 332 static int __init early_parse_user_mode(char *p)
 333 {
 334         if (p && strcmp(p, "primary") == 0)
 335                 user_mode = PRIMARY_SPACE_MODE;
 336         else if (!p || strcmp(p, "home") == 0)
 337                 user_mode = HOME_SPACE_MODE;
 338         else
 339                 return 1;
 340         return 0;
 341 }
 342 early_param("user_mode", early_parse_user_mode);
 343
 344 static void setup_addressing_mode(void)
 345 {
 346         if (user_mode == PRIMARY_SPACE_MODE) {
 347                 if (set_amode_primary())
 348                         pr_info("Address spaces switched, "
 349                                 "mvcos available\n");
 350                 else
 351                         pr_info("Address spaces switched, "
 352                                 "mvcos not available\n");
 353         }
 354 }
 355
 356 void *restart_stack __attribute__((__section__(".data")));
 357
 358 static void __init setup_lowcore(void)
 359 {
 360         struct _lowcore *lc;
 361
 362         /*
 363          * Setup lowcore for boot cpu
 364          */
 365         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 366         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 367         lc->restart_psw.mask = psw_kernel_bits;
 368         lc->restart_psw.addr =
 369                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 370         lc->external_new_psw.mask = psw_kernel_bits |
 371                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 372         lc->external_new_psw.addr =
 373                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 374         lc->svc_new_psw.mask = psw_kernel_bits |
 375                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 376         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 377         lc->program_new_psw.mask = psw_kernel_bits |
 378                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 379         lc->program_new_psw.addr =
 380                 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
 381         lc->mcck_new_psw.mask = psw_kernel_bits;
 382         lc->mcck_new_psw.addr =
 383                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 384         lc->io_new_psw.mask = psw_kernel_bits |
 385                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 386         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 387         lc->clock_comparator = -1ULL;
 388         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 389         lc->async_stack = (unsigned long)
 390                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 391         lc->panic_stack = (unsigned long)
 392                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 393         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 394         lc->thread_info = (unsigned long) &init_thread_union;
 395         lc->machine_flags = S390_lowcore.machine_flags;
 396         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 397         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 398                MAX_FACILITY_BIT/8);
 399 #ifndef CONFIG_64BIT
 400         if (MACHINE_HAS_IEEE) {
 401                 lc->extended_save_area_addr = (__u32)
 402                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 403                 /* enable extended save area */
 404                 __ctl_set_bit(14, 29);
 405         }
 406 #else
 407         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 408 #endif
 409         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 410         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 411         lc->exit_timer = S390_lowcore.exit_timer;
 412         lc->user_timer = S390_lowcore.user_timer;
 413         lc->system_timer = S390_lowcore.system_timer;
 414         lc->steal_timer = S390_lowcore.steal_timer;
 415         lc->last_update_timer = S390_lowcore.last_update_timer;
 416         lc->last_update_clock = S390_lowcore.last_update_clock;
 417         lc->ftrace_func = S390_lowcore.ftrace_func;
 418
 419         restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
 420         restart_stack += ASYNC_SIZE;
 421
 422         /*
 423          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 424          * restart data to the absolute zero lowcore. This is necesary if
 425          * PSW restart is done on an offline CPU that has lowcore zero.
 426          */
 427         lc->restart_stack = (unsigned long) restart_stack;
 428         lc->restart_fn = (unsigned long) do_restart;
 429         lc->restart_data = 0;
 430         lc->restart_source = -1UL;
 431
 432         /* Setup absolute zero lowcore */
 433         memcpy_absolute(&S390_lowcore.restart_stack, &lc->restart_stack,
 434                         4 * sizeof(unsigned long));
 435         memcpy_absolute(&S390_lowcore.restart_psw, &lc->restart_psw,
 436                         sizeof(lc->restart_psw));
 437
 438         set_prefix((u32)(unsigned long) lc);
 439         lowcore_ptr[0] = lc;
 440 }
 441
 442 static struct resource code_resource = {
 443         .name  = "Kernel code",
 444         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 445 };
 446
 447 static struct resource data_resource = {
 448         .name = "Kernel data",
 449         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 450 };
 451
 452 static struct resource bss_resource = {
 453         .name = "Kernel bss",
 454         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 455 };
 456
 457 static struct resource __initdata *standard_resources[] = {
 458         &code_resource,
 459         &data_resource,
 460         &bss_resource,
 461 };
 462
 463 static void __init setup_resources(void)
 464 {
 465         struct resource *res, *std_res, *sub_res;
 466         int i, j;
 467
 468         code_resource.start = (unsigned long) &_text;
 469         code_resource.end = (unsigned long) &_etext - 1;
 470         data_resource.start = (unsigned long) &_etext;
 471         data_resource.end = (unsigned long) &_edata - 1;
 472         bss_resource.start = (unsigned long) &__bss_start;
 473         bss_resource.end = (unsigned long) &__bss_stop - 1;
 474
 475         for (i = 0; i < MEMORY_CHUNKS; i++) {
 476                 if (!memory_chunk[i].size)
 477                         continue;
 478                 if (memory_chunk[i].type == CHUNK_OLDMEM ||
 479                     memory_chunk[i].type == CHUNK_CRASHK)
 480                         continue;
 481                 res = alloc_bootmem_low(sizeof(*res));
 482                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 483                 switch (memory_chunk[i].type) {
 484                 case CHUNK_READ_WRITE:
 485                 case CHUNK_CRASHK:
 486                         res->name = "System RAM";
 487                         break;
 488                 case CHUNK_READ_ONLY:
 489                         res->name = "System ROM";
 490                         res->flags |= IORESOURCE_READONLY;
 491                         break;
 492                 default:
 493                         res->name = "reserved";
 494                 }
 495                 res->start = memory_chunk[i].addr;
 496                 res->end = res->start + memory_chunk[i].size - 1;
 497                 request_resource(&iomem_resource, res);
 498
 499                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 500                         std_res = standard_resources[j];
 501                         if (std_res->start < res->start ||
 502                             std_res->start > res->end)
 503                                 continue;
 504                         if (std_res->end > res->end) {
 505                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 506                                 *sub_res = *std_res;
 507                                 sub_res->end = res->end;
 508                                 std_res->start = res->end + 1;
 509                                 request_resource(res, sub_res);
 510                         } else {
 511                                 request_resource(res, std_res);
 512                         }
 513                 }
 514         }
 515 }
 516
 517 unsigned long real_memory_size;
 518 EXPORT_SYMBOL_GPL(real_memory_size);
 519
 520 static void __init setup_memory_end(void)
 521 {
 522         unsigned long vmax, vmalloc_size, tmp;
 523         int i;
 524
 525
 526 #ifdef CONFIG_ZFCPDUMP
 527         if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
 528                 memory_end = ZFCPDUMP_HSA_SIZE;
 529                 memory_end_set = 1;
 530         }
 531 #endif
 532         real_memory_size = 0;
 533         memory_end &= PAGE_MASK;
 534
 535         /*
 536          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 537          * extra checks that HOLES_IN_ZONE would require.
 538          */
 539         for (i = 0; i < MEMORY_CHUNKS; i++) {
 540                 unsigned long start, end;
 541                 struct mem_chunk *chunk;
 542                 unsigned long align;
 543
 544                 chunk = &memory_chunk[i];
 545                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 546                 start = (chunk->addr + align - 1) & ~(align - 1);
 547                 end = (chunk->addr + chunk->size) & ~(align - 1);
 548                 if (start >= end)
 549                         memset(chunk, 0, sizeof(*chunk));
 550                 else {
 551                         chunk->addr = start;
 552                         chunk->size = end - start;
 553                 }
 554                 real_memory_size = max(real_memory_size,
 555                                        chunk->addr + chunk->size);
 556         }
 557
 558         /* Choose kernel address space layout: 2, 3, or 4 levels. */
 559 #ifdef CONFIG_64BIT
 560         vmalloc_size = VMALLOC_END ?: 128UL << 30;
 561         tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
 562         tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
 563         if (tmp <= (1UL << 42))
 564                 vmax = 1UL << 42;       /* 3-level kernel page table */
 565         else
 566                 vmax = 1UL << 53;       /* 4-level kernel page table */
 567 #else
 568         vmalloc_size = VMALLOC_END ?: 96UL << 20;
 569         vmax = 1UL << 31;               /* 2-level kernel page table */
 570 #endif
 571         /* vmalloc area is at the end of the kernel address space. */
 572         VMALLOC_END = vmax;
 573         VMALLOC_START = vmax - vmalloc_size;
 574
 575         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 576         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 577         tmp = VMALLOC_START - tmp * sizeof(struct page);
 578         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 579         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 580         vmemmap = (struct page *) tmp;
 581
 582         /* Take care that memory_end is set and <= vmemmap */
 583         memory_end = min(memory_end ?: real_memory_size, tmp);
 584
 585         /* Fixup memory chunk array to fit into 0..memory_end */
 586         for (i = 0; i < MEMORY_CHUNKS; i++) {
 587                 struct mem_chunk *chunk = &memory_chunk[i];
 588
 589                 if (chunk->addr >= memory_end) {
 590                         memset(chunk, 0, sizeof(*chunk));
 591                         continue;
 592                 }
 593                 if (chunk->addr + chunk->size > memory_end)
 594                         chunk->size = memory_end - chunk->addr;
 595         }
 596 }
 597
 598 static void __init setup_vmcoreinfo(void)
 599 {
 600 #ifdef CONFIG_KEXEC
 601         unsigned long ptr = paddr_vmcoreinfo_note();
 602
 603         memcpy_absolute(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
 604 #endif
 605 }
 606
 607 #ifdef CONFIG_CRASH_DUMP
 608
 609 /*
 610  * Find suitable location for crashkernel memory
 611  */
 612 static unsigned long __init find_crash_base(unsigned long crash_size,
 613                                             char **msg)
 614 {
 615         unsigned long crash_base;
 616         struct mem_chunk *chunk;
 617         int i;
 618
 619         if (memory_chunk[0].size < crash_size) {
 620                 *msg = "first memory chunk must be at least crashkernel size";
 621                 return 0;
 622         }
 623         if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
 624                 return OLDMEM_BASE;
 625
 626         for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
 627                 chunk = &memory_chunk[i];
 628                 if (chunk->size == 0)
 629                         continue;
 630                 if (chunk->type != CHUNK_READ_WRITE)
 631                         continue;
 632                 if (chunk->size < crash_size)
 633                         continue;
 634                 crash_base = (chunk->addr + chunk->size) - crash_size;
 635                 if (crash_base < crash_size)
 636                         continue;
 637                 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
 638                         continue;
 639                 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
 640                         continue;
 641                 return crash_base;
 642         }
 643         *msg = "no suitable area found";
 644         return 0;
 645 }
 646
 647 /*
 648  * Check if crash_base and crash_size is valid
 649  */
 650 static int __init verify_crash_base(unsigned long crash_base,
 651                                     unsigned long crash_size,
 652                                     char **msg)
 653 {
 654         struct mem_chunk *chunk;
 655         int i;
 656
 657         /*
 658          * Because we do the swap to zero, we must have at least 'crash_size'
 659          * bytes free space before crash_base
 660          */
 661         if (crash_size > crash_base) {
 662                 *msg = "crashkernel offset must be greater than size";
 663                 return -EINVAL;
 664         }
 665
 666         /* First memory chunk must be at least crash_size */
 667         if (memory_chunk[0].size < crash_size) {
 668                 *msg = "first memory chunk must be at least crashkernel size";
 669                 return -EINVAL;
 670         }
 671         /* Check if we fit into the respective memory chunk */
 672         for (i = 0; i < MEMORY_CHUNKS; i++) {
 673                 chunk = &memory_chunk[i];
 674                 if (chunk->size == 0)
 675                         continue;
 676                 if (crash_base < chunk->addr)
 677                         continue;
 678                 if (crash_base >= chunk->addr + chunk->size)
 679                         continue;
 680                 /* we have found the memory chunk */
 681                 if (crash_base + crash_size > chunk->addr + chunk->size) {
 682                         *msg = "selected memory chunk is too small for "
 683                                 "crashkernel memory";
 684                         return -EINVAL;
 685                 }
 686                 return 0;
 687         }
 688         *msg = "invalid memory range specified";
 689         return -EINVAL;
 690 }
 691
 692 /*
 693  * Reserve kdump memory by creating a memory hole in the mem_chunk array
 694  */
 695 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
 696                                          int type)
 697 {
 698         create_mem_hole(memory_chunk, addr, size, type);
 699 }
 700
 701 /*
 702  * When kdump is enabled, we have to ensure that no memory from
 703  * the area [0 - crashkernel memory size] and
 704  * [crashk_res.start - crashk_res.end] is set offline.
 705  */
 706 static int kdump_mem_notifier(struct notifier_block *nb,
 707                               unsigned long action, void *data)
 708 {
 709         struct memory_notify *arg = data;
 710
 711         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 712                 return NOTIFY_BAD;
 713         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 714                 return NOTIFY_OK;
 715         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 716                 return NOTIFY_OK;
 717         return NOTIFY_BAD;
 718 }
 719
 720 static struct notifier_block kdump_mem_nb = {
 721         .notifier_call = kdump_mem_notifier,
 722 };
 723
 724 #endif
 725
 726 /*
 727  * Make sure that oldmem, where the dump is stored, is protected
 728  */
 729 static void reserve_oldmem(void)
 730 {
 731 #ifdef CONFIG_CRASH_DUMP
 732         if (!OLDMEM_BASE)
 733                 return;
 734
 735         reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
 736         reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
 737                               CHUNK_OLDMEM);
 738         if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
 739                 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
 740         else
 741                 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
 742 #endif
 743 }
 744
 745 /*
 746  * Reserve memory for kdump kernel to be loaded with kexec
 747  */
 748 static void __init reserve_crashkernel(void)
 749 {
 750 #ifdef CONFIG_CRASH_DUMP
 751         unsigned long long crash_base, crash_size;
 752         char *msg = NULL;
 753         int rc;
 754
 755         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 756                                &crash_base);
 757         if (rc || crash_size == 0)
 758                 return;
 759         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 760         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 761         if (register_memory_notifier(&kdump_mem_nb))
 762                 return;
 763         if (!crash_base)
 764                 crash_base = find_crash_base(crash_size, &msg);
 765         if (!crash_base) {
 766                 pr_info("crashkernel reservation failed: %s\n", msg);
 767                 unregister_memory_notifier(&kdump_mem_nb);
 768                 return;
 769         }
 770         if (verify_crash_base(crash_base, crash_size, &msg)) {
 771                 pr_info("crashkernel reservation failed: %s\n", msg);
 772                 unregister_memory_notifier(&kdump_mem_nb);
 773                 return;
 774         }
 775         if (!OLDMEM_BASE && MACHINE_IS_VM)
 776                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 777         crashk_res.start = crash_base;
 778         crashk_res.end = crash_base + crash_size - 1;
 779         insert_resource(&iomem_resource, &crashk_res);
 780         reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
 781         pr_info("Reserving %lluMB of memory at %lluMB "
 782                 "for crashkernel (System RAM: %luMB)\n",
 783                 crash_size >> 20, crash_base >> 20, memory_end >> 20);
 784         os_info_crashkernel_add(crash_base, crash_size);
 785 #endif
 786 }
 787
 788 static void __init setup_memory(void)
 789 {
 790         unsigned long bootmap_size;
 791         unsigned long start_pfn, end_pfn;
 792         int i;
 793
 794         /*
 795          * partially used pages are not usable - thus
 796          * we are rounding upwards:
 797          */
 798         start_pfn = PFN_UP(__pa(&_end));
 799         end_pfn = max_pfn = PFN_DOWN(memory_end);
 800
 801 #ifdef CONFIG_BLK_DEV_INITRD
 802         /*
 803          * Move the initrd in case the bitmap of the bootmem allocater
 804          * would overwrite it.
 805          */
 806
 807         if (INITRD_START && INITRD_SIZE) {
 808                 unsigned long bmap_size;
 809                 unsigned long start;
 810
 811                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 812                 bmap_size = PFN_PHYS(bmap_size);
 813
 814                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 815                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 816
 817 #ifdef CONFIG_CRASH_DUMP
 818                         if (OLDMEM_BASE) {
 819                                 /* Move initrd behind kdump oldmem */
 820                                 if (start + INITRD_SIZE > OLDMEM_BASE &&
 821                                     start < OLDMEM_BASE + OLDMEM_SIZE)
 822                                         start = OLDMEM_BASE + OLDMEM_SIZE;
 823                         }
 824 #endif
 825                         if (start + INITRD_SIZE > memory_end) {
 826                                 pr_err("initrd extends beyond end of "
 827                                        "memory (0x%08lx > 0x%08lx) "
 828                                        "disabling initrd\n",
 829                                        start + INITRD_SIZE, memory_end);
 830                                 INITRD_START = INITRD_SIZE = 0;
 831                         } else {
 832                                 pr_info("Moving initrd (0x%08lx -> "
 833                                         "0x%08lx, size: %ld)\n",
 834                                         INITRD_START, start, INITRD_SIZE);
 835                                 memmove((void *) start, (void *) INITRD_START,
 836                                         INITRD_SIZE);
 837                                 INITRD_START = start;
 838                         }
 839                 }
 840         }
 841 #endif
 842
 843         /*
 844          * Initialize the boot-time allocator
 845          */
 846         bootmap_size = init_bootmem(start_pfn, end_pfn);
 847
 848         /*
 849          * Register RAM areas with the bootmem allocator.
 850          */
 851
 852         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 853                 unsigned long start_chunk, end_chunk, pfn;
 854
 855                 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
 856                     memory_chunk[i].type != CHUNK_CRASHK)
 857                         continue;
 858                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 859                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 860                 end_chunk = min(end_chunk, end_pfn);
 861                 if (start_chunk >= end_chunk)
 862                         continue;
 863                 memblock_add_node(PFN_PHYS(start_chunk),
 864                                   PFN_PHYS(end_chunk - start_chunk), 0);
 865                 pfn = max(start_chunk, start_pfn);
 866                 for (; pfn < end_chunk; pfn++)
 867                         page_set_storage_key(PFN_PHYS(pfn),
 868                                              PAGE_DEFAULT_KEY, 0);
 869         }
 870
 871         psw_set_key(PAGE_DEFAULT_KEY);
 872
 873         free_bootmem_with_active_regions(0, max_pfn);
 874
 875         /*
 876          * Reserve memory used for lowcore/command line/kernel image.
 877          */
 878         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 879         reserve_bootmem((unsigned long)_stext,
 880                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 881                         BOOTMEM_DEFAULT);
 882         /*
 883          * Reserve the bootmem bitmap itself as well. We do this in two
 884          * steps (first step was init_bootmem()) because this catches
 885          * the (very unlikely) case of us accidentally initializing the
 886          * bootmem allocator with an invalid RAM area.
 887          */
 888         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 889                         BOOTMEM_DEFAULT);
 890
 891 #ifdef CONFIG_CRASH_DUMP
 892         if (crashk_res.start)
 893                 reserve_bootmem(crashk_res.start,
 894                                 crashk_res.end - crashk_res.start + 1,
 895                                 BOOTMEM_DEFAULT);
 896         if (is_kdump_kernel())
 897                 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
 898                                 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
 899 #endif
 900 #ifdef CONFIG_BLK_DEV_INITRD
 901         if (INITRD_START && INITRD_SIZE) {
 902                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 903                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 904                                         BOOTMEM_DEFAULT);
 905                         initrd_start = INITRD_START;
 906                         initrd_end = initrd_start + INITRD_SIZE;
 907                 } else {
 908                         pr_err("initrd extends beyond end of "
 909                                "memory (0x%08lx > 0x%08lx) "
 910                                "disabling initrd\n",
 911                                initrd_start + INITRD_SIZE, memory_end);
 912                         initrd_start = initrd_end = 0;
 913                 }
 914         }
 915 #endif
 916 }
 917
 918 /*
 919  * Setup hardware capabilities.
 920  */
 921 static void __init setup_hwcaps(void)
 922 {
 923         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 924         struct cpuid cpu_id;
 925         int i;
 926
 927         /*
 928          * The store facility list bits numbers as found in the principles
 929          * of operation are numbered with bit 1UL<<31 as number 0 to
 930          * bit 1UL<<0 as number 31.
 931          *   Bit 0: instructions named N3, "backported" to esa-mode
 932          *   Bit 2: z/Architecture mode is active
 933          *   Bit 7: the store-facility-list-extended facility is installed
 934          *   Bit 17: the message-security assist is installed
 935          *   Bit 19: the long-displacement facility is installed
 936          *   Bit 21: the extended-immediate facility is installed
 937          *   Bit 22: extended-translation facility 3 is installed
 938          *   Bit 30: extended-translation facility 3 enhancement facility
 939          * These get translated to:
 940          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 941          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 942          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 943          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 944          */
 945         for (i = 0; i < 6; i++)
 946                 if (test_facility(stfl_bits[i]))
 947                         elf_hwcap |= 1UL << i;
 948
 949         if (test_facility(22) && test_facility(30))
 950                 elf_hwcap |= HWCAP_S390_ETF3EH;
 951
 952         /*
 953          * Check for additional facilities with store-facility-list-extended.
 954          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 955          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 956          * as stored by stfl, bits 32-xxx contain additional facilities.
 957          * How many facility words are stored depends on the number of
 958          * doublewords passed to the instruction. The additional facilities
 959          * are:
 960          *   Bit 42: decimal floating point facility is installed
 961          *   Bit 44: perform floating point operation facility is installed
 962          * translated to:
 963          *   HWCAP_S390_DFP bit 6 (42 && 44).
 964          */
 965         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 966                 elf_hwcap |= HWCAP_S390_DFP;
 967
 968         /*
 969          * Huge page support HWCAP_S390_HPAGE is bit 7.
 970          */
 971         if (MACHINE_HAS_HPAGE)
 972                 elf_hwcap |= HWCAP_S390_HPAGE;
 973
 974         /*
 975          * 64-bit register support for 31-bit processes
 976          * HWCAP_S390_HIGH_GPRS is bit 9.
 977          */
 978         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 979
 980         get_cpu_id(&cpu_id);
 981         switch (cpu_id.machine) {
 982         case 0x9672:
 983 #if !defined(CONFIG_64BIT)
 984         default:        /* Use "g5" as default for 31 bit kernels. */
 985 #endif
 986                 strcpy(elf_platform, "g5");
 987                 break;
 988         case 0x2064:
 989         case 0x2066:
 990 #if defined(CONFIG_64BIT)
 991         default:        /* Use "z900" as default for 64 bit kernels. */
 992 #endif
 993                 strcpy(elf_platform, "z900");
 994                 break;
 995         case 0x2084:
 996         case 0x2086:
 997                 strcpy(elf_platform, "z990");
 998                 break;
 999         case 0x2094:
1000         case 0x2096:
1001                 strcpy(elf_platform, "z9-109");
1002                 break;
1003         case 0x2097:
1004         case 0x2098:
1005                 strcpy(elf_platform, "z10");
1006                 break;
1007         case 0x2817:
1008         case 0x2818:
1009                 strcpy(elf_platform, "z196");
1010                 break;
1011         }
1012 }
1013
1014 /*
1015  * Setup function called from init/main.c just after the banner
1016  * was printed.
1017  */
1018
1019 void __init setup_arch(char **cmdline_p)
1020 {
1021         /*
1022          * print what head.S has found out about the machine
1023          */
1024 #ifndef CONFIG_64BIT
1025         if (MACHINE_IS_VM)
1026                 pr_info("Linux is running as a z/VM "
1027                         "guest operating system in 31-bit mode\n");
1028         else if (MACHINE_IS_LPAR)
1029                 pr_info("Linux is running natively in 31-bit mode\n");
1030         if (MACHINE_HAS_IEEE)
1031                 pr_info("The hardware system has IEEE compatible "
1032                         "floating point units\n");
1033         else
1034                 pr_info("The hardware system has no IEEE compatible "
1035                         "floating point units\n");
1036 #else /* CONFIG_64BIT */
1037         if (MACHINE_IS_VM)
1038                 pr_info("Linux is running as a z/VM "
1039                         "guest operating system in 64-bit mode\n");
1040         else if (MACHINE_IS_KVM)
1041                 pr_info("Linux is running under KVM in 64-bit mode\n");
1042         else if (MACHINE_IS_LPAR)
1043                 pr_info("Linux is running natively in 64-bit mode\n");
1044 #endif /* CONFIG_64BIT */
1045
1046         /* Have one command line that is parsed and saved in /proc/cmdline */
1047         /* boot_command_line has been already set up in early.c */
1048         *cmdline_p = boot_command_line;
1049
1050         ROOT_DEV = Root_RAM0;
1051
1052         init_mm.start_code = PAGE_OFFSET;
1053         init_mm.end_code = (unsigned long) &_etext;
1054         init_mm.end_data = (unsigned long) &_edata;
1055         init_mm.brk = (unsigned long) &_end;
1056
1057         if (MACHINE_HAS_MVCOS)
1058                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1059         else
1060                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1061
1062         parse_early_param();
1063
1064         os_info_init();
1065         setup_ipl();
1066         setup_memory_end();
1067         setup_addressing_mode();
1068         reserve_oldmem();
1069         reserve_crashkernel();
1070         setup_memory();
1071         setup_resources();
1072         setup_vmcoreinfo();
1073         setup_lowcore();
1074
1075         cpu_init();
1076         s390_init_cpu_topology();
1077
1078         /*
1079          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1080          */
1081         setup_hwcaps();
1082
1083         /*
1084          * Create kernel page tables and switch to virtual addressing.
1085          */
1086         paging_init();
1087
1088         /* Setup default console */
1089         conmode_default();
1090         set_preferred_console();
1091
1092         /* Setup zfcpdump support */
1093         setup_zfcpdump(console_devno);
1094 }