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 #ifdef CONFIG_64BIT
 109 unsigned long MODULES_VADDR;
 110 unsigned long MODULES_END;
 111 #endif
 112
 113 /* An array with a pointer to the lowcore of every CPU. */
 114 struct _lowcore *lowcore_ptr[NR_CPUS];
 115 EXPORT_SYMBOL(lowcore_ptr);
 116
 117 /*
 118  * This is set up by the setup-routine at boot-time
 119  * for S390 need to find out, what we have to setup
 120  * using address 0x10400 ...
 121  */
 122
 123 #include <asm/setup.h>
 124
 125 /*
 126  * condev= and conmode= setup parameter.
 127  */
 128
 129 static int __init condev_setup(char *str)
 130 {
 131         int vdev;
 132
 133         vdev = simple_strtoul(str, &str, 0);
 134         if (vdev >= 0 && vdev < 65536) {
 135                 console_devno = vdev;
 136                 console_irq = -1;
 137         }
 138         return 1;
 139 }
 140
 141 __setup("condev=", condev_setup);
 142
 143 static void __init set_preferred_console(void)
 144 {
 145         if (MACHINE_IS_KVM) {
 146                 if (sclp_has_vt220())
 147                         add_preferred_console("ttyS", 1, NULL);
 148                 else if (sclp_has_linemode())
 149                         add_preferred_console("ttyS", 0, NULL);
 150                 else
 151                         add_preferred_console("hvc", 0, NULL);
 152         } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 153                 add_preferred_console("ttyS", 0, NULL);
 154         else if (CONSOLE_IS_3270)
 155                 add_preferred_console("tty3270", 0, NULL);
 156 }
 157
 158 static int __init conmode_setup(char *str)
 159 {
 160 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 161         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 162                 SET_CONSOLE_SCLP;
 163 #endif
 164 #if defined(CONFIG_TN3215_CONSOLE)
 165         if (strncmp(str, "3215", 5) == 0)
 166                 SET_CONSOLE_3215;
 167 #endif
 168 #if defined(CONFIG_TN3270_CONSOLE)
 169         if (strncmp(str, "3270", 5) == 0)
 170                 SET_CONSOLE_3270;
 171 #endif
 172         set_preferred_console();
 173         return 1;
 174 }
 175
 176 __setup("conmode=", conmode_setup);
 177
 178 static void __init conmode_default(void)
 179 {
 180         char query_buffer[1024];
 181         char *ptr;
 182
 183         if (MACHINE_IS_VM) {
 184                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 185                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 186                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 187                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 188                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 189                 ptr = strstr(query_buffer, "CONMODE");
 190                 /*
 191                  * Set the conmode to 3215 so that the device recognition
 192                  * will set the cu_type of the console to 3215. If the
 193                  * conmode is 3270 and we don't set it back then both
 194                  * 3215 and the 3270 driver will try to access the console
 195                  * device (3215 as console and 3270 as normal tty).
 196                  */
 197                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 198                 if (ptr == NULL) {
 199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 200                         SET_CONSOLE_SCLP;
 201 #endif
 202                         return;
 203                 }
 204                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 205 #if defined(CONFIG_TN3270_CONSOLE)
 206                         SET_CONSOLE_3270;
 207 #elif defined(CONFIG_TN3215_CONSOLE)
 208                         SET_CONSOLE_3215;
 209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 210                         SET_CONSOLE_SCLP;
 211 #endif
 212                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 213 #if defined(CONFIG_TN3215_CONSOLE)
 214                         SET_CONSOLE_3215;
 215 #elif defined(CONFIG_TN3270_CONSOLE)
 216                         SET_CONSOLE_3270;
 217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 218                         SET_CONSOLE_SCLP;
 219 #endif
 220                 }
 221         } else {
 222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 223                 SET_CONSOLE_SCLP;
 224 #endif
 225         }
 226 }
 227
 228 #ifdef CONFIG_ZFCPDUMP
 229 static void __init setup_zfcpdump(unsigned int console_devno)
 230 {
 231         static char str[41];
 232
 233         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 234                 return;
 235         if (OLDMEM_BASE)
 236                 return;
 237         if (console_devno != -1)
 238                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 239                         ipl_info.data.fcp.dev_id.devno, console_devno);
 240         else
 241                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 242                         ipl_info.data.fcp.dev_id.devno);
 243         strcat(boot_command_line, str);
 244         console_loglevel = 2;
 245 }
 246 #else
 247 static inline void setup_zfcpdump(unsigned int console_devno) {}
 248 #endif /* CONFIG_ZFCPDUMP */
 249
 250  /*
 251  * Reboot, halt and power_off stubs. They just call _machine_restart,
 252  * _machine_halt or _machine_power_off.
 253  */
 254
 255 void machine_restart(char *command)
 256 {
 257         if ((!in_interrupt() && !in_atomic()) || 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_restart(command);
 264 }
 265
 266 void machine_halt(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_halt();
 275 }
 276
 277 void machine_power_off(void)
 278 {
 279         if (!in_interrupt() || oops_in_progress)
 280                 /*
 281                  * Only unblank the console if we are called in enabled
 282                  * context or a bust_spinlocks cleared the way for us.
 283                  */
 284                 console_unblank();
 285         _machine_power_off();
 286 }
 287
 288 /*
 289  * Dummy power off function.
 290  */
 291 void (*pm_power_off)(void) = machine_power_off;
 292
 293 static int __init early_parse_mem(char *p)
 294 {
 295         memory_end = memparse(p, &p);
 296         memory_end_set = 1;
 297         return 0;
 298 }
 299 early_param("mem", early_parse_mem);
 300
 301 static int __init parse_vmalloc(char *arg)
 302 {
 303         if (!arg)
 304                 return -EINVAL;
 305         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
 306         return 0;
 307 }
 308 early_param("vmalloc", parse_vmalloc);
 309
 310 unsigned int s390_user_mode = PRIMARY_SPACE_MODE;
 311 EXPORT_SYMBOL_GPL(s390_user_mode);
 312
 313 static void __init set_user_mode_primary(void)
 314 {
 315         psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
 316         psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
 317 #ifdef CONFIG_COMPAT
 318         psw32_user_bits =
 319                 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
 320 #endif
 321         uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt;
 322 }
 323
 324 static int __init early_parse_user_mode(char *p)
 325 {
 326         if (p && strcmp(p, "primary") == 0)
 327                 s390_user_mode = PRIMARY_SPACE_MODE;
 328         else if (!p || strcmp(p, "home") == 0)
 329                 s390_user_mode = HOME_SPACE_MODE;
 330         else
 331                 return 1;
 332         return 0;
 333 }
 334 early_param("user_mode", early_parse_user_mode);
 335
 336 static void __init setup_addressing_mode(void)
 337 {
 338         if (s390_user_mode != PRIMARY_SPACE_MODE)
 339                 return;
 340         set_user_mode_primary();
 341         if (MACHINE_HAS_MVCOS)
 342                 pr_info("Address spaces switched, mvcos available\n");
 343         else
 344                 pr_info("Address spaces switched, mvcos not available\n");
 345 }
 346
 347 void *restart_stack __attribute__((__section__(".data")));
 348
 349 static void __init setup_lowcore(void)
 350 {
 351         struct _lowcore *lc;
 352
 353         /*
 354          * Setup lowcore for boot cpu
 355          */
 356         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 357         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 358         lc->restart_psw.mask = psw_kernel_bits;
 359         lc->restart_psw.addr =
 360                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 361         lc->external_new_psw.mask = psw_kernel_bits |
 362                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 363         lc->external_new_psw.addr =
 364                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 365         lc->svc_new_psw.mask = psw_kernel_bits |
 366                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 367         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 368         lc->program_new_psw.mask = psw_kernel_bits |
 369                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 370         lc->program_new_psw.addr =
 371                 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
 372         lc->mcck_new_psw.mask = psw_kernel_bits;
 373         lc->mcck_new_psw.addr =
 374                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 375         lc->io_new_psw.mask = psw_kernel_bits |
 376                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 377         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 378         lc->clock_comparator = -1ULL;
 379         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 380         lc->async_stack = (unsigned long)
 381                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 382         lc->panic_stack = (unsigned long)
 383                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 384         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 385         lc->thread_info = (unsigned long) &init_thread_union;
 386         lc->machine_flags = S390_lowcore.machine_flags;
 387         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 388         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 389                MAX_FACILITY_BIT/8);
 390 #ifndef CONFIG_64BIT
 391         if (MACHINE_HAS_IEEE) {
 392                 lc->extended_save_area_addr = (__u32)
 393                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 394                 /* enable extended save area */
 395                 __ctl_set_bit(14, 29);
 396         }
 397 #else
 398         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 399 #endif
 400         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 401         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 402         lc->exit_timer = S390_lowcore.exit_timer;
 403         lc->user_timer = S390_lowcore.user_timer;
 404         lc->system_timer = S390_lowcore.system_timer;
 405         lc->steal_timer = S390_lowcore.steal_timer;
 406         lc->last_update_timer = S390_lowcore.last_update_timer;
 407         lc->last_update_clock = S390_lowcore.last_update_clock;
 408         lc->ftrace_func = S390_lowcore.ftrace_func;
 409
 410         restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
 411         restart_stack += ASYNC_SIZE;
 412
 413         /*
 414          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 415          * restart data to the absolute zero lowcore. This is necesary if
 416          * PSW restart is done on an offline CPU that has lowcore zero.
 417          */
 418         lc->restart_stack = (unsigned long) restart_stack;
 419         lc->restart_fn = (unsigned long) do_restart;
 420         lc->restart_data = 0;
 421         lc->restart_source = -1UL;
 422
 423         /* Setup absolute zero lowcore */
 424         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
 425         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
 426         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
 427         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
 428         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 429
 430         set_prefix((u32)(unsigned long) lc);
 431         lowcore_ptr[0] = lc;
 432 }
 433
 434 static struct resource code_resource = {
 435         .name  = "Kernel code",
 436         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 437 };
 438
 439 static struct resource data_resource = {
 440         .name = "Kernel data",
 441         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 442 };
 443
 444 static struct resource bss_resource = {
 445         .name = "Kernel bss",
 446         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 447 };
 448
 449 static struct resource __initdata *standard_resources[] = {
 450         &code_resource,
 451         &data_resource,
 452         &bss_resource,
 453 };
 454
 455 static void __init setup_resources(void)
 456 {
 457         struct resource *res, *std_res, *sub_res;
 458         int i, j;
 459
 460         code_resource.start = (unsigned long) &_text;
 461         code_resource.end = (unsigned long) &_etext - 1;
 462         data_resource.start = (unsigned long) &_etext;
 463         data_resource.end = (unsigned long) &_edata - 1;
 464         bss_resource.start = (unsigned long) &__bss_start;
 465         bss_resource.end = (unsigned long) &__bss_stop - 1;
 466
 467         for (i = 0; i < MEMORY_CHUNKS; i++) {
 468                 if (!memory_chunk[i].size)
 469                         continue;
 470                 if (memory_chunk[i].type == CHUNK_OLDMEM ||
 471                     memory_chunk[i].type == CHUNK_CRASHK)
 472                         continue;
 473                 res = alloc_bootmem_low(sizeof(*res));
 474                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 475                 switch (memory_chunk[i].type) {
 476                 case CHUNK_READ_WRITE:
 477                 case CHUNK_CRASHK:
 478                         res->name = "System RAM";
 479                         break;
 480                 case CHUNK_READ_ONLY:
 481                         res->name = "System ROM";
 482                         res->flags |= IORESOURCE_READONLY;
 483                         break;
 484                 default:
 485                         res->name = "reserved";
 486                 }
 487                 res->start = memory_chunk[i].addr;
 488                 res->end = res->start + memory_chunk[i].size - 1;
 489                 request_resource(&iomem_resource, res);
 490
 491                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 492                         std_res = standard_resources[j];
 493                         if (std_res->start < res->start ||
 494                             std_res->start > res->end)
 495                                 continue;
 496                         if (std_res->end > res->end) {
 497                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 498                                 *sub_res = *std_res;
 499                                 sub_res->end = res->end;
 500                                 std_res->start = res->end + 1;
 501                                 request_resource(res, sub_res);
 502                         } else {
 503                                 request_resource(res, std_res);
 504                         }
 505                 }
 506         }
 507 }
 508
 509 unsigned long real_memory_size;
 510 EXPORT_SYMBOL_GPL(real_memory_size);
 511
 512 static void __init setup_memory_end(void)
 513 {
 514         unsigned long vmax, vmalloc_size, tmp;
 515         int i;
 516
 517
 518 #ifdef CONFIG_ZFCPDUMP
 519         if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
 520                 memory_end = ZFCPDUMP_HSA_SIZE;
 521                 memory_end_set = 1;
 522         }
 523 #endif
 524         real_memory_size = 0;
 525         memory_end &= PAGE_MASK;
 526
 527         /*
 528          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 529          * extra checks that HOLES_IN_ZONE would require.
 530          */
 531         for (i = 0; i < MEMORY_CHUNKS; i++) {
 532                 unsigned long start, end;
 533                 struct mem_chunk *chunk;
 534                 unsigned long align;
 535
 536                 chunk = &memory_chunk[i];
 537                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 538                 start = (chunk->addr + align - 1) & ~(align - 1);
 539                 end = (chunk->addr + chunk->size) & ~(align - 1);
 540                 if (start >= end)
 541                         memset(chunk, 0, sizeof(*chunk));
 542                 else {
 543                         chunk->addr = start;
 544                         chunk->size = end - start;
 545                 }
 546                 real_memory_size = max(real_memory_size,
 547                                        chunk->addr + chunk->size);
 548         }
 549
 550         /* Choose kernel address space layout: 2, 3, or 4 levels. */
 551 #ifdef CONFIG_64BIT
 552         vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
 553         tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
 554         tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
 555         if (tmp <= (1UL << 42))
 556                 vmax = 1UL << 42;       /* 3-level kernel page table */
 557         else
 558                 vmax = 1UL << 53;       /* 4-level kernel page table */
 559         /* module area is at the end of the kernel address space. */
 560         MODULES_END = vmax;
 561         MODULES_VADDR = MODULES_END - MODULES_LEN;
 562         VMALLOC_END = MODULES_VADDR;
 563 #else
 564         vmalloc_size = VMALLOC_END ?: 96UL << 20;
 565         vmax = 1UL << 31;               /* 2-level kernel page table */
 566         /* vmalloc area is at the end of the kernel address space. */
 567         VMALLOC_END = vmax;
 568 #endif
 569         VMALLOC_START = vmax - vmalloc_size;
 570
 571         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 572         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 573         tmp = VMALLOC_START - tmp * sizeof(struct page);
 574         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 575         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 576         vmemmap = (struct page *) tmp;
 577
 578         /* Take care that memory_end is set and <= vmemmap */
 579         memory_end = min(memory_end ?: real_memory_size, tmp);
 580
 581         /* Fixup memory chunk array to fit into 0..memory_end */
 582         for (i = 0; i < MEMORY_CHUNKS; i++) {
 583                 struct mem_chunk *chunk = &memory_chunk[i];
 584
 585                 if (chunk->addr >= memory_end) {
 586                         memset(chunk, 0, sizeof(*chunk));
 587                         continue;
 588                 }
 589                 if (chunk->addr + chunk->size > memory_end)
 590                         chunk->size = memory_end - chunk->addr;
 591         }
 592 }
 593
 594 static void __init setup_vmcoreinfo(void)
 595 {
 596         mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
 597 }
 598
 599 #ifdef CONFIG_CRASH_DUMP
 600
 601 /*
 602  * Find suitable location for crashkernel memory
 603  */
 604 static unsigned long __init find_crash_base(unsigned long crash_size,
 605                                             char **msg)
 606 {
 607         unsigned long crash_base;
 608         struct mem_chunk *chunk;
 609         int i;
 610
 611         if (memory_chunk[0].size < crash_size) {
 612                 *msg = "first memory chunk must be at least crashkernel size";
 613                 return 0;
 614         }
 615         if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
 616                 return OLDMEM_BASE;
 617
 618         for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
 619                 chunk = &memory_chunk[i];
 620                 if (chunk->size == 0)
 621                         continue;
 622                 if (chunk->type != CHUNK_READ_WRITE)
 623                         continue;
 624                 if (chunk->size < crash_size)
 625                         continue;
 626                 crash_base = (chunk->addr + chunk->size) - crash_size;
 627                 if (crash_base < crash_size)
 628                         continue;
 629                 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
 630                         continue;
 631                 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
 632                         continue;
 633                 return crash_base;
 634         }
 635         *msg = "no suitable area found";
 636         return 0;
 637 }
 638
 639 /*
 640  * Check if crash_base and crash_size is valid
 641  */
 642 static int __init verify_crash_base(unsigned long crash_base,
 643                                     unsigned long crash_size,
 644                                     char **msg)
 645 {
 646         struct mem_chunk *chunk;
 647         int i;
 648
 649         /*
 650          * Because we do the swap to zero, we must have at least 'crash_size'
 651          * bytes free space before crash_base
 652          */
 653         if (crash_size > crash_base) {
 654                 *msg = "crashkernel offset must be greater than size";
 655                 return -EINVAL;
 656         }
 657
 658         /* First memory chunk must be at least crash_size */
 659         if (memory_chunk[0].size < crash_size) {
 660                 *msg = "first memory chunk must be at least crashkernel size";
 661                 return -EINVAL;
 662         }
 663         /* Check if we fit into the respective memory chunk */
 664         for (i = 0; i < MEMORY_CHUNKS; i++) {
 665                 chunk = &memory_chunk[i];
 666                 if (chunk->size == 0)
 667                         continue;
 668                 if (crash_base < chunk->addr)
 669                         continue;
 670                 if (crash_base >= chunk->addr + chunk->size)
 671                         continue;
 672                 /* we have found the memory chunk */
 673                 if (crash_base + crash_size > chunk->addr + chunk->size) {
 674                         *msg = "selected memory chunk is too small for "
 675                                 "crashkernel memory";
 676                         return -EINVAL;
 677                 }
 678                 return 0;
 679         }
 680         *msg = "invalid memory range specified";
 681         return -EINVAL;
 682 }
 683
 684 /*
 685  * Reserve kdump memory by creating a memory hole in the mem_chunk array
 686  */
 687 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
 688                                          int type)
 689 {
 690         create_mem_hole(memory_chunk, addr, size, type);
 691 }
 692
 693 /*
 694  * When kdump is enabled, we have to ensure that no memory from
 695  * the area [0 - crashkernel memory size] and
 696  * [crashk_res.start - crashk_res.end] is set offline.
 697  */
 698 static int kdump_mem_notifier(struct notifier_block *nb,
 699                               unsigned long action, void *data)
 700 {
 701         struct memory_notify *arg = data;
 702
 703         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 704                 return NOTIFY_BAD;
 705         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 706                 return NOTIFY_OK;
 707         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 708                 return NOTIFY_OK;
 709         return NOTIFY_BAD;
 710 }
 711
 712 static struct notifier_block kdump_mem_nb = {
 713         .notifier_call = kdump_mem_notifier,
 714 };
 715
 716 #endif
 717
 718 /*
 719  * Make sure that oldmem, where the dump is stored, is protected
 720  */
 721 static void reserve_oldmem(void)
 722 {
 723 #ifdef CONFIG_CRASH_DUMP
 724         if (!OLDMEM_BASE)
 725                 return;
 726
 727         reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
 728         reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
 729                               CHUNK_OLDMEM);
 730         if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
 731                 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
 732         else
 733                 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
 734 #endif
 735 }
 736
 737 /*
 738  * Reserve memory for kdump kernel to be loaded with kexec
 739  */
 740 static void __init reserve_crashkernel(void)
 741 {
 742 #ifdef CONFIG_CRASH_DUMP
 743         unsigned long long crash_base, crash_size;
 744         char *msg = NULL;
 745         int rc;
 746
 747         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 748                                &crash_base);
 749         if (rc || crash_size == 0)
 750                 return;
 751         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 752         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 753         if (register_memory_notifier(&kdump_mem_nb))
 754                 return;
 755         if (!crash_base)
 756                 crash_base = find_crash_base(crash_size, &msg);
 757         if (!crash_base) {
 758                 pr_info("crashkernel reservation failed: %s\n", msg);
 759                 unregister_memory_notifier(&kdump_mem_nb);
 760                 return;
 761         }
 762         if (verify_crash_base(crash_base, crash_size, &msg)) {
 763                 pr_info("crashkernel reservation failed: %s\n", msg);
 764                 unregister_memory_notifier(&kdump_mem_nb);
 765                 return;
 766         }
 767         if (!OLDMEM_BASE && MACHINE_IS_VM)
 768                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 769         crashk_res.start = crash_base;
 770         crashk_res.end = crash_base + crash_size - 1;
 771         insert_resource(&iomem_resource, &crashk_res);
 772         reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
 773         pr_info("Reserving %lluMB of memory at %lluMB "
 774                 "for crashkernel (System RAM: %luMB)\n",
 775                 crash_size >> 20, crash_base >> 20, memory_end >> 20);
 776         os_info_crashkernel_add(crash_base, crash_size);
 777 #endif
 778 }
 779
 780 static void __init setup_memory(void)
 781 {
 782         unsigned long bootmap_size;
 783         unsigned long start_pfn, end_pfn;
 784         int i;
 785
 786         /*
 787          * partially used pages are not usable - thus
 788          * we are rounding upwards:
 789          */
 790         start_pfn = PFN_UP(__pa(&_end));
 791         end_pfn = max_pfn = PFN_DOWN(memory_end);
 792
 793 #ifdef CONFIG_BLK_DEV_INITRD
 794         /*
 795          * Move the initrd in case the bitmap of the bootmem allocater
 796          * would overwrite it.
 797          */
 798
 799         if (INITRD_START && INITRD_SIZE) {
 800                 unsigned long bmap_size;
 801                 unsigned long start;
 802
 803                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 804                 bmap_size = PFN_PHYS(bmap_size);
 805
 806                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 807                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 808
 809 #ifdef CONFIG_CRASH_DUMP
 810                         if (OLDMEM_BASE) {
 811                                 /* Move initrd behind kdump oldmem */
 812                                 if (start + INITRD_SIZE > OLDMEM_BASE &&
 813                                     start < OLDMEM_BASE + OLDMEM_SIZE)
 814                                         start = OLDMEM_BASE + OLDMEM_SIZE;
 815                         }
 816 #endif
 817                         if (start + INITRD_SIZE > memory_end) {
 818                                 pr_err("initrd extends beyond end of "
 819                                        "memory (0x%08lx > 0x%08lx) "
 820                                        "disabling initrd\n",
 821                                        start + INITRD_SIZE, memory_end);
 822                                 INITRD_START = INITRD_SIZE = 0;
 823                         } else {
 824                                 pr_info("Moving initrd (0x%08lx -> "
 825                                         "0x%08lx, size: %ld)\n",
 826                                         INITRD_START, start, INITRD_SIZE);
 827                                 memmove((void *) start, (void *) INITRD_START,
 828                                         INITRD_SIZE);
 829                                 INITRD_START = start;
 830                         }
 831                 }
 832         }
 833 #endif
 834
 835         /*
 836          * Initialize the boot-time allocator
 837          */
 838         bootmap_size = init_bootmem(start_pfn, end_pfn);
 839
 840         /*
 841          * Register RAM areas with the bootmem allocator.
 842          */
 843
 844         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 845                 unsigned long start_chunk, end_chunk, pfn;
 846
 847                 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
 848                     memory_chunk[i].type != CHUNK_CRASHK)
 849                         continue;
 850                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 851                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 852                 end_chunk = min(end_chunk, end_pfn);
 853                 if (start_chunk >= end_chunk)
 854                         continue;
 855                 memblock_add_node(PFN_PHYS(start_chunk),
 856                                   PFN_PHYS(end_chunk - start_chunk), 0);
 857                 pfn = max(start_chunk, start_pfn);
 858                 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
 859         }
 860
 861         psw_set_key(PAGE_DEFAULT_KEY);
 862
 863         free_bootmem_with_active_regions(0, max_pfn);
 864
 865         /*
 866          * Reserve memory used for lowcore/command line/kernel image.
 867          */
 868         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 869         reserve_bootmem((unsigned long)_stext,
 870                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 871                         BOOTMEM_DEFAULT);
 872         /*
 873          * Reserve the bootmem bitmap itself as well. We do this in two
 874          * steps (first step was init_bootmem()) because this catches
 875          * the (very unlikely) case of us accidentally initializing the
 876          * bootmem allocator with an invalid RAM area.
 877          */
 878         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 879                         BOOTMEM_DEFAULT);
 880
 881 #ifdef CONFIG_CRASH_DUMP
 882         if (crashk_res.start)
 883                 reserve_bootmem(crashk_res.start,
 884                                 crashk_res.end - crashk_res.start + 1,
 885                                 BOOTMEM_DEFAULT);
 886         if (is_kdump_kernel())
 887                 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
 888                                 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
 889 #endif
 890 #ifdef CONFIG_BLK_DEV_INITRD
 891         if (INITRD_START && INITRD_SIZE) {
 892                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 893                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 894                                         BOOTMEM_DEFAULT);
 895                         initrd_start = INITRD_START;
 896                         initrd_end = initrd_start + INITRD_SIZE;
 897                 } else {
 898                         pr_err("initrd extends beyond end of "
 899                                "memory (0x%08lx > 0x%08lx) "
 900                                "disabling initrd\n",
 901                                initrd_start + INITRD_SIZE, memory_end);
 902                         initrd_start = initrd_end = 0;
 903                 }
 904         }
 905 #endif
 906 }
 907
 908 /*
 909  * Setup hardware capabilities.
 910  */
 911 static void __init setup_hwcaps(void)
 912 {
 913         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 914         struct cpuid cpu_id;
 915         int i;
 916
 917         /*
 918          * The store facility list bits numbers as found in the principles
 919          * of operation are numbered with bit 1UL<<31 as number 0 to
 920          * bit 1UL<<0 as number 31.
 921          *   Bit 0: instructions named N3, "backported" to esa-mode
 922          *   Bit 2: z/Architecture mode is active
 923          *   Bit 7: the store-facility-list-extended facility is installed
 924          *   Bit 17: the message-security assist is installed
 925          *   Bit 19: the long-displacement facility is installed
 926          *   Bit 21: the extended-immediate facility is installed
 927          *   Bit 22: extended-translation facility 3 is installed
 928          *   Bit 30: extended-translation facility 3 enhancement facility
 929          * These get translated to:
 930          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 931          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 932          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 933          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 934          */
 935         for (i = 0; i < 6; i++)
 936                 if (test_facility(stfl_bits[i]))
 937                         elf_hwcap |= 1UL << i;
 938
 939         if (test_facility(22) && test_facility(30))
 940                 elf_hwcap |= HWCAP_S390_ETF3EH;
 941
 942         /*
 943          * Check for additional facilities with store-facility-list-extended.
 944          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 945          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 946          * as stored by stfl, bits 32-xxx contain additional facilities.
 947          * How many facility words are stored depends on the number of
 948          * doublewords passed to the instruction. The additional facilities
 949          * are:
 950          *   Bit 42: decimal floating point facility is installed
 951          *   Bit 44: perform floating point operation facility is installed
 952          * translated to:
 953          *   HWCAP_S390_DFP bit 6 (42 && 44).
 954          */
 955         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 956                 elf_hwcap |= HWCAP_S390_DFP;
 957
 958         /*
 959          * Huge page support HWCAP_S390_HPAGE is bit 7.
 960          */
 961         if (MACHINE_HAS_HPAGE)
 962                 elf_hwcap |= HWCAP_S390_HPAGE;
 963
 964 #if defined(CONFIG_64BIT)
 965         /*
 966          * 64-bit register support for 31-bit processes
 967          * HWCAP_S390_HIGH_GPRS is bit 9.
 968          */
 969         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 970
 971         /*
 972          * Transactional execution support HWCAP_S390_TE is bit 10.
 973          */
 974         if (test_facility(50) && test_facility(73))
 975                 elf_hwcap |= HWCAP_S390_TE;
 976 #endif
 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         case 0x2827:
1010                 strcpy(elf_platform, "zEC12");
1011                 break;
1012         }
1013 }
1014
1015 /*
1016  * Setup function called from init/main.c just after the banner
1017  * was printed.
1018  */
1019
1020 void __init setup_arch(char **cmdline_p)
1021 {
1022         /*
1023          * print what head.S has found out about the machine
1024          */
1025 #ifndef CONFIG_64BIT
1026         if (MACHINE_IS_VM)
1027                 pr_info("Linux is running as a z/VM "
1028                         "guest operating system in 31-bit mode\n");
1029         else if (MACHINE_IS_LPAR)
1030                 pr_info("Linux is running natively in 31-bit mode\n");
1031         if (MACHINE_HAS_IEEE)
1032                 pr_info("The hardware system has IEEE compatible "
1033                         "floating point units\n");
1034         else
1035                 pr_info("The hardware system has no IEEE compatible "
1036                         "floating point units\n");
1037 #else /* CONFIG_64BIT */
1038         if (MACHINE_IS_VM)
1039                 pr_info("Linux is running as a z/VM "
1040                         "guest operating system in 64-bit mode\n");
1041         else if (MACHINE_IS_KVM)
1042                 pr_info("Linux is running under KVM in 64-bit mode\n");
1043         else if (MACHINE_IS_LPAR)
1044                 pr_info("Linux is running natively in 64-bit mode\n");
1045 #endif /* CONFIG_64BIT */
1046
1047         /* Have one command line that is parsed and saved in /proc/cmdline */
1048         /* boot_command_line has been already set up in early.c */
1049         *cmdline_p = boot_command_line;
1050
1051         ROOT_DEV = Root_RAM0;
1052
1053         init_mm.start_code = PAGE_OFFSET;
1054         init_mm.end_code = (unsigned long) &_etext;
1055         init_mm.end_data = (unsigned long) &_edata;
1056         init_mm.brk = (unsigned long) &_end;
1057
1058         if (MACHINE_HAS_MVCOS)
1059                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1060         else
1061                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1062
1063         parse_early_param();
1064
1065         os_info_init();
1066         setup_ipl();
1067         setup_memory_end();
1068         setup_addressing_mode();
1069         reserve_oldmem();
1070         reserve_crashkernel();
1071         setup_memory();
1072         setup_resources();
1073         setup_vmcoreinfo();
1074         setup_lowcore();
1075
1076         cpu_init();
1077         s390_init_cpu_topology();
1078
1079         /*
1080          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1081          */
1082         setup_hwcaps();
1083
1084         /*
1085          * Create kernel page tables and switch to virtual addressing.
1086          */
1087         paging_init();
1088
1089         /* Setup default console */
1090         conmode_default();
1091         set_preferred_console();
1092
1093         /* Setup zfcpdump support */
1094         setup_zfcpdump(console_devno);
1095 }