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   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #define KMSG_COMPONENT "setup"
  18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  19
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/sched.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/stddef.h>
  26 #include <linux/unistd.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/tty.h>
  31 #include <linux/ioport.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/initrd.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/console.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/kernel_stat.h>
  40 #include <linux/device.h>
  41 #include <linux/notifier.h>
  42 #include <linux/pfn.h>
  43 #include <linux/ctype.h>
  44 #include <linux/reboot.h>
  45 #include <linux/topology.h>
  46
  47 #include <asm/ipl.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/system.h>
  50 #include <asm/smp.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/cpcmd.h>
  53 #include <asm/lowcore.h>
  54 #include <asm/irq.h>
  55 #include <asm/page.h>
  56 #include <asm/ptrace.h>
  57 #include <asm/sections.h>
  58 #include <asm/ebcdic.h>
  59 #include <asm/compat.h>
  60 #include <asm/kvm_virtio.h>
  61
  62 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  63                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  64 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  65                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  66                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  67
  68 /*
  69  * User copy operations.
  70  */
  71 struct uaccess_ops uaccess;
  72 EXPORT_SYMBOL(uaccess);
  73
  74 /*
  75  * Machine setup..
  76  */
  77 unsigned int console_mode = 0;
  78 unsigned int console_devno = -1;
  79 unsigned int console_irq = -1;
  80 unsigned long machine_flags;
  81 unsigned long elf_hwcap = 0;
  82 char elf_platform[ELF_PLATFORM_SIZE];
  83
  84 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  85 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  86 static unsigned long __initdata memory_end;
  87
  88 /*
  89  * This is set up by the setup-routine at boot-time
  90  * for S390 need to find out, what we have to setup
  91  * using address 0x10400 ...
  92  */
  93
  94 #include <asm/setup.h>
  95
  96 static struct resource code_resource = {
  97         .name  = "Kernel code",
  98         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  99 };
 100
 101 static struct resource data_resource = {
 102         .name = "Kernel data",
 103         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 104 };
 105
 106 /*
 107  * cpu_init() initializes state that is per-CPU.
 108  */
 109 void __cpuinit cpu_init(void)
 110 {
 111         int addr = hard_smp_processor_id();
 112
 113         /*
 114          * Store processor id in lowcore (used e.g. in timer_interrupt)
 115          */
 116         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 117         S390_lowcore.cpu_data.cpu_addr = addr;
 118
 119         /*
 120          * Force FPU initialization:
 121          */
 122         clear_thread_flag(TIF_USEDFPU);
 123         clear_used_math();
 124
 125         atomic_inc(&init_mm.mm_count);
 126         current->active_mm = &init_mm;
 127         if (current->mm)
 128                 BUG();
 129         enter_lazy_tlb(&init_mm, current);
 130 }
 131
 132 /*
 133  * condev= and conmode= setup parameter.
 134  */
 135
 136 static int __init condev_setup(char *str)
 137 {
 138         int vdev;
 139
 140         vdev = simple_strtoul(str, &str, 0);
 141         if (vdev >= 0 && vdev < 65536) {
 142                 console_devno = vdev;
 143                 console_irq = -1;
 144         }
 145         return 1;
 146 }
 147
 148 __setup("condev=", condev_setup);
 149
 150 static int __init conmode_setup(char *str)
 151 {
 152 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 153         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 154                 SET_CONSOLE_SCLP;
 155 #endif
 156 #if defined(CONFIG_TN3215_CONSOLE)
 157         if (strncmp(str, "3215", 5) == 0)
 158                 SET_CONSOLE_3215;
 159 #endif
 160 #if defined(CONFIG_TN3270_CONSOLE)
 161         if (strncmp(str, "3270", 5) == 0)
 162                 SET_CONSOLE_3270;
 163 #endif
 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 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 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 (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         return 0;
 286 }
 287 early_param("mem", early_parse_mem);
 288
 289 #ifdef CONFIG_S390_SWITCH_AMODE
 290 #ifdef CONFIG_PGSTE
 291 unsigned int switch_amode = 1;
 292 #else
 293 unsigned int switch_amode = 0;
 294 #endif
 295 EXPORT_SYMBOL_GPL(switch_amode);
 296
 297 static int set_amode_and_uaccess(unsigned long user_amode,
 298                                  unsigned long user32_amode)
 299 {
 300         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 301                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 302                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 303 #ifdef CONFIG_COMPAT
 304         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 305                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 306                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 307         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 308                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 309                           PSW32_MASK_PSTATE;
 310 #endif
 311         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 312                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 313
 314         if (MACHINE_HAS_MVCOS) {
 315                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 316                 return 1;
 317         } else {
 318                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 319                 return 0;
 320         }
 321 }
 322
 323 /*
 324  * Switch kernel/user addressing modes?
 325  */
 326 static int __init early_parse_switch_amode(char *p)
 327 {
 328         switch_amode = 1;
 329         return 0;
 330 }
 331 early_param("switch_amode", early_parse_switch_amode);
 332
 333 #else /* CONFIG_S390_SWITCH_AMODE */
 334 static inline int set_amode_and_uaccess(unsigned long user_amode,
 335                                         unsigned long user32_amode)
 336 {
 337         return 0;
 338 }
 339 #endif /* CONFIG_S390_SWITCH_AMODE */
 340
 341 #ifdef CONFIG_S390_EXEC_PROTECT
 342 unsigned int s390_noexec = 0;
 343 EXPORT_SYMBOL_GPL(s390_noexec);
 344
 345 /*
 346  * Enable execute protection?
 347  */
 348 static int __init early_parse_noexec(char *p)
 349 {
 350         if (!strncmp(p, "off", 3))
 351                 return 0;
 352         switch_amode = 1;
 353         s390_noexec = 1;
 354         return 0;
 355 }
 356 early_param("noexec", early_parse_noexec);
 357 #endif /* CONFIG_S390_EXEC_PROTECT */
 358
 359 static void setup_addressing_mode(void)
 360 {
 361         if (s390_noexec) {
 362                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 363                                           PSW32_ASC_SECONDARY))
 364                         pr_info("Execute protection active, "
 365                                 "mvcos available\n");
 366                 else
 367                         pr_info("Execute protection active, "
 368                                 "mvcos not available\n");
 369         } else if (switch_amode) {
 370                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 371                         pr_info("Address spaces switched, "
 372                                 "mvcos available\n");
 373                 else
 374                         pr_info("Address spaces switched, "
 375                                 "mvcos not available\n");
 376         }
 377 #ifdef CONFIG_TRACE_IRQFLAGS
 378         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 379         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 380 #endif
 381 }
 382
 383 static void __init
 384 setup_lowcore(void)
 385 {
 386         struct _lowcore *lc;
 387         int lc_pages;
 388
 389         /*
 390          * Setup lowcore for boot cpu
 391          */
 392         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 393         lc = (struct _lowcore *)
 394                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 395         memset(lc, 0, lc_pages * PAGE_SIZE);
 396         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 397         lc->restart_psw.addr =
 398                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 399         if (switch_amode)
 400                 lc->restart_psw.mask |= PSW_ASC_HOME;
 401         lc->external_new_psw.mask = psw_kernel_bits;
 402         lc->external_new_psw.addr =
 403                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 404         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 405         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 406         lc->program_new_psw.mask = psw_kernel_bits;
 407         lc->program_new_psw.addr =
 408                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 409         lc->mcck_new_psw.mask =
 410                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 411         lc->mcck_new_psw.addr =
 412                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 413         lc->io_new_psw.mask = psw_kernel_bits;
 414         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 415         lc->ipl_device = S390_lowcore.ipl_device;
 416         lc->clock_comparator = -1ULL;
 417         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 418         lc->async_stack = (unsigned long)
 419                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 420         lc->panic_stack = (unsigned long)
 421                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 422         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 423         lc->thread_info = (unsigned long) &init_thread_union;
 424 #ifndef CONFIG_64BIT
 425         if (MACHINE_HAS_IEEE) {
 426                 lc->extended_save_area_addr = (__u32)
 427                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 428                 /* enable extended save area */
 429                 __ctl_set_bit(14, 29);
 430         }
 431 #endif
 432         set_prefix((u32)(unsigned long) lc);
 433 }
 434
 435 static void __init
 436 setup_resources(void)
 437 {
 438         struct resource *res, *sub_res;
 439         int i;
 440
 441         code_resource.start = (unsigned long) &_text;
 442         code_resource.end = (unsigned long) &_etext - 1;
 443         data_resource.start = (unsigned long) &_etext;
 444         data_resource.end = (unsigned long) &_edata - 1;
 445
 446         for (i = 0; i < MEMORY_CHUNKS; i++) {
 447                 if (!memory_chunk[i].size)
 448                         continue;
 449                 res = alloc_bootmem_low(sizeof(struct resource));
 450                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 451                 switch (memory_chunk[i].type) {
 452                 case CHUNK_READ_WRITE:
 453                         res->name = "System RAM";
 454                         break;
 455                 case CHUNK_READ_ONLY:
 456                         res->name = "System ROM";
 457                         res->flags |= IORESOURCE_READONLY;
 458                         break;
 459                 default:
 460                         res->name = "reserved";
 461                 }
 462                 res->start = memory_chunk[i].addr;
 463                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 464                 request_resource(&iomem_resource, res);
 465
 466                 if (code_resource.start >= res->start  &&
 467                         code_resource.start <= res->end &&
 468                         code_resource.end > res->end) {
 469                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 470                         memcpy(sub_res, &code_resource,
 471                                 sizeof(struct resource));
 472                         sub_res->end = res->end;
 473                         code_resource.start = res->end + 1;
 474                         request_resource(res, sub_res);
 475                 }
 476
 477                 if (code_resource.start >= res->start &&
 478                         code_resource.start <= res->end &&
 479                         code_resource.end <= res->end)
 480                         request_resource(res, &code_resource);
 481
 482                 if (data_resource.start >= res->start &&
 483                         data_resource.start <= res->end &&
 484                         data_resource.end > res->end) {
 485                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 486                         memcpy(sub_res, &data_resource,
 487                                 sizeof(struct resource));
 488                         sub_res->end = res->end;
 489                         data_resource.start = res->end + 1;
 490                         request_resource(res, sub_res);
 491                 }
 492
 493                 if (data_resource.start >= res->start &&
 494                         data_resource.start <= res->end &&
 495                         data_resource.end <= res->end)
 496                         request_resource(res, &data_resource);
 497         }
 498 }
 499
 500 unsigned long real_memory_size;
 501 EXPORT_SYMBOL_GPL(real_memory_size);
 502
 503 static void __init setup_memory_end(void)
 504 {
 505         unsigned long memory_size;
 506         unsigned long max_mem;
 507         int i;
 508
 509 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 510         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 511                 memory_end = ZFCPDUMP_HSA_SIZE;
 512 #endif
 513         memory_size = 0;
 514         memory_end &= PAGE_MASK;
 515
 516         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 517         memory_end = min(max_mem, memory_end);
 518
 519         /*
 520          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 521          * extra checks that HOLES_IN_ZONE would require.
 522          */
 523         for (i = 0; i < MEMORY_CHUNKS; i++) {
 524                 unsigned long start, end;
 525                 struct mem_chunk *chunk;
 526                 unsigned long align;
 527
 528                 chunk = &memory_chunk[i];
 529                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 530                 start = (chunk->addr + align - 1) & ~(align - 1);
 531                 end = (chunk->addr + chunk->size) & ~(align - 1);
 532                 if (start >= end)
 533                         memset(chunk, 0, sizeof(*chunk));
 534                 else {
 535                         chunk->addr = start;
 536                         chunk->size = end - start;
 537                 }
 538         }
 539
 540         for (i = 0; i < MEMORY_CHUNKS; i++) {
 541                 struct mem_chunk *chunk = &memory_chunk[i];
 542
 543                 real_memory_size = max(real_memory_size,
 544                                        chunk->addr + chunk->size);
 545                 if (chunk->addr >= max_mem) {
 546                         memset(chunk, 0, sizeof(*chunk));
 547                         continue;
 548                 }
 549                 if (chunk->addr + chunk->size > max_mem)
 550                         chunk->size = max_mem - chunk->addr;
 551                 memory_size = max(memory_size, chunk->addr + chunk->size);
 552         }
 553         if (!memory_end)
 554                 memory_end = memory_size;
 555 }
 556
 557 static void __init
 558 setup_memory(void)
 559 {
 560         unsigned long bootmap_size;
 561         unsigned long start_pfn, end_pfn;
 562         int i;
 563
 564         /*
 565          * partially used pages are not usable - thus
 566          * we are rounding upwards:
 567          */
 568         start_pfn = PFN_UP(__pa(&_end));
 569         end_pfn = max_pfn = PFN_DOWN(memory_end);
 570
 571 #ifdef CONFIG_BLK_DEV_INITRD
 572         /*
 573          * Move the initrd in case the bitmap of the bootmem allocater
 574          * would overwrite it.
 575          */
 576
 577         if (INITRD_START && INITRD_SIZE) {
 578                 unsigned long bmap_size;
 579                 unsigned long start;
 580
 581                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 582                 bmap_size = PFN_PHYS(bmap_size);
 583
 584                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 585                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 586
 587                         if (start + INITRD_SIZE > memory_end) {
 588                                 pr_err("initrd extends beyond end of "
 589                                        "memory (0x%08lx > 0x%08lx) "
 590                                        "disabling initrd\n",
 591                                        start + INITRD_SIZE, memory_end);
 592                                 INITRD_START = INITRD_SIZE = 0;
 593                         } else {
 594                                 pr_info("Moving initrd (0x%08lx -> "
 595                                         "0x%08lx, size: %ld)\n",
 596                                         INITRD_START, start, INITRD_SIZE);
 597                                 memmove((void *) start, (void *) INITRD_START,
 598                                         INITRD_SIZE);
 599                                 INITRD_START = start;
 600                         }
 601                 }
 602         }
 603 #endif
 604
 605         /*
 606          * Initialize the boot-time allocator
 607          */
 608         bootmap_size = init_bootmem(start_pfn, end_pfn);
 609
 610         /*
 611          * Register RAM areas with the bootmem allocator.
 612          */
 613
 614         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 615                 unsigned long start_chunk, end_chunk, pfn;
 616
 617                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 618                         continue;
 619                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 620                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 621                 end_chunk = min(end_chunk, end_pfn);
 622                 if (start_chunk >= end_chunk)
 623                         continue;
 624                 add_active_range(0, start_chunk, end_chunk);
 625                 pfn = max(start_chunk, start_pfn);
 626                 for (; pfn < end_chunk; pfn++)
 627                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 628         }
 629
 630         psw_set_key(PAGE_DEFAULT_KEY);
 631
 632         free_bootmem_with_active_regions(0, max_pfn);
 633
 634         /*
 635          * Reserve memory used for lowcore/command line/kernel image.
 636          */
 637         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 638         reserve_bootmem((unsigned long)_stext,
 639                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 640                         BOOTMEM_DEFAULT);
 641         /*
 642          * Reserve the bootmem bitmap itself as well. We do this in two
 643          * steps (first step was init_bootmem()) because this catches
 644          * the (very unlikely) case of us accidentally initializing the
 645          * bootmem allocator with an invalid RAM area.
 646          */
 647         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 648                         BOOTMEM_DEFAULT);
 649
 650 #ifdef CONFIG_BLK_DEV_INITRD
 651         if (INITRD_START && INITRD_SIZE) {
 652                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 653                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 654                                         BOOTMEM_DEFAULT);
 655                         initrd_start = INITRD_START;
 656                         initrd_end = initrd_start + INITRD_SIZE;
 657                 } else {
 658                         pr_err("initrd extends beyond end of "
 659                                "memory (0x%08lx > 0x%08lx) "
 660                                "disabling initrd\n",
 661                                initrd_start + INITRD_SIZE, memory_end);
 662                         initrd_start = initrd_end = 0;
 663                 }
 664         }
 665 #endif
 666 }
 667
 668 /*
 669  * Setup hardware capabilities.
 670  */
 671 static void __init setup_hwcaps(void)
 672 {
 673         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 674         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 675         unsigned long long facility_list_extended;
 676         unsigned int facility_list;
 677         int i;
 678
 679         facility_list = stfl();
 680         /*
 681          * The store facility list bits numbers as found in the principles
 682          * of operation are numbered with bit 1UL<<31 as number 0 to
 683          * bit 1UL<<0 as number 31.
 684          *   Bit 0: instructions named N3, "backported" to esa-mode
 685          *   Bit 2: z/Architecture mode is active
 686          *   Bit 7: the store-facility-list-extended facility is installed
 687          *   Bit 17: the message-security assist is installed
 688          *   Bit 19: the long-displacement facility is installed
 689          *   Bit 21: the extended-immediate facility is installed
 690          * These get translated to:
 691          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 692          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 693          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 694          */
 695         for (i = 0; i < 6; i++)
 696                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 697                         elf_hwcap |= 1UL << i;
 698
 699         /*
 700          * Check for additional facilities with store-facility-list-extended.
 701          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 702          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 703          * as stored by stfl, bits 32-xxx contain additional facilities.
 704          * How many facility words are stored depends on the number of
 705          * doublewords passed to the instruction. The additional facilites
 706          * are:
 707          *   Bit 43: decimal floating point facility is installed
 708          * translated to:
 709          *   HWCAP_S390_DFP bit 6.
 710          */
 711         if ((elf_hwcap & (1UL << 2)) &&
 712             __stfle(&facility_list_extended, 1) > 0) {
 713                 if (facility_list_extended & (1ULL << (64 - 43)))
 714                         elf_hwcap |= 1UL << 6;
 715         }
 716
 717         if (MACHINE_HAS_HPAGE)
 718                 elf_hwcap |= 1UL << 7;
 719
 720         switch (cpuinfo->cpu_id.machine) {
 721         case 0x9672:
 722 #if !defined(CONFIG_64BIT)
 723         default:        /* Use "g5" as default for 31 bit kernels. */
 724 #endif
 725                 strcpy(elf_platform, "g5");
 726                 break;
 727         case 0x2064:
 728         case 0x2066:
 729 #if defined(CONFIG_64BIT)
 730         default:        /* Use "z900" as default for 64 bit kernels. */
 731 #endif
 732                 strcpy(elf_platform, "z900");
 733                 break;
 734         case 0x2084:
 735         case 0x2086:
 736                 strcpy(elf_platform, "z990");
 737                 break;
 738         case 0x2094:
 739         case 0x2096:
 740                 strcpy(elf_platform, "z9-109");
 741                 break;
 742         case 0x2097:
 743         case 0x2098:
 744                 strcpy(elf_platform, "z10");
 745                 break;
 746         }
 747 }
 748
 749 /*
 750  * Setup function called from init/main.c just after the banner
 751  * was printed.
 752  */
 753
 754 void __init
 755 setup_arch(char **cmdline_p)
 756 {
 757         /* set up preferred console */
 758         add_preferred_console("ttyS", 0, NULL);
 759
 760         /*
 761          * print what head.S has found out about the machine
 762          */
 763 #ifndef CONFIG_64BIT
 764         if (MACHINE_IS_VM)
 765                 pr_info("Linux is running as a z/VM "
 766                         "guest operating system in 31-bit mode\n");
 767         else
 768                 pr_info("Linux is running natively in 31-bit mode\n");
 769         if (MACHINE_HAS_IEEE)
 770                 pr_info("The hardware system has IEEE compatible "
 771                         "floating point units\n");
 772         else
 773                 pr_info("The hardware system has no IEEE compatible "
 774                         "floating point units\n");
 775 #else /* CONFIG_64BIT */
 776         if (MACHINE_IS_VM)
 777                 pr_info("Linux is running as a z/VM "
 778                         "guest operating system in 64-bit mode\n");
 779         else if (MACHINE_IS_KVM) {
 780                 pr_info("Linux is running under KVM in 64-bit mode\n");
 781                 add_preferred_console("hvc", 0, NULL);
 782                 s390_virtio_console_init();
 783         } else
 784                 pr_info("Linux is running natively in 64-bit mode\n");
 785 #endif /* CONFIG_64BIT */
 786
 787         /* Have one command line that is parsed and saved in /proc/cmdline */
 788         /* boot_command_line has been already set up in early.c */
 789         *cmdline_p = boot_command_line;
 790
 791         ROOT_DEV = Root_RAM0;
 792
 793         init_mm.start_code = PAGE_OFFSET;
 794         init_mm.end_code = (unsigned long) &_etext;
 795         init_mm.end_data = (unsigned long) &_edata;
 796         init_mm.brk = (unsigned long) &_end;
 797
 798         if (MACHINE_HAS_MVCOS)
 799                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 800         else
 801                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 802
 803         parse_early_param();
 804
 805         setup_ipl();
 806         setup_memory_end();
 807         setup_addressing_mode();
 808         setup_memory();
 809         setup_resources();
 810         setup_lowcore();
 811
 812         cpu_init();
 813         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 814         s390_init_cpu_topology();
 815
 816         /*
 817          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 818          */
 819         setup_hwcaps();
 820
 821         /*
 822          * Create kernel page tables and switch to virtual addressing.
 823          */
 824         paging_init();
 825
 826         /* Setup default console */
 827         conmode_default();
 828
 829         /* Setup zfcpdump support */
 830         setup_zfcpdump(console_devno);
 831 }
 832
 833 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 834 {
 835    printk(KERN_INFO "cpu %d "
 836 #ifdef CONFIG_SMP
 837            "phys_idx=%d "
 838 #endif
 839            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 840            cpuinfo->cpu_nr,
 841 #ifdef CONFIG_SMP
 842            cpuinfo->cpu_addr,
 843 #endif
 844            cpuinfo->cpu_id.version,
 845            cpuinfo->cpu_id.ident,
 846            cpuinfo->cpu_id.machine,
 847            cpuinfo->cpu_id.unused);
 848 }
 849
 850 /*
 851  * show_cpuinfo - Get information on one CPU for use by procfs.
 852  */
 853
 854 static int show_cpuinfo(struct seq_file *m, void *v)
 855 {
 856         static const char *hwcap_str[8] = {
 857                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 858                 "edat"
 859         };
 860         struct cpuinfo_S390 *cpuinfo;
 861         unsigned long n = (unsigned long) v - 1;
 862         int i;
 863
 864         s390_adjust_jiffies();
 865         preempt_disable();
 866         if (!n) {
 867                 seq_printf(m, "vendor_id       : IBM/S390\n"
 868                                "# processors    : %i\n"
 869                                "bogomips per cpu: %lu.%02lu\n",
 870                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 871                                (loops_per_jiffy/(5000/HZ))%100);
 872                 seq_puts(m, "features\t: ");
 873                 for (i = 0; i < 8; i++)
 874                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 875                                 seq_printf(m, "%s ", hwcap_str[i]);
 876                 seq_puts(m, "\n");
 877         }
 878
 879         if (cpu_online(n)) {
 880 #ifdef CONFIG_SMP
 881                 if (smp_processor_id() == n)
 882                         cpuinfo = &S390_lowcore.cpu_data;
 883                 else
 884                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 885 #else
 886                 cpuinfo = &S390_lowcore.cpu_data;
 887 #endif
 888                 seq_printf(m, "processor %li: "
 889                                "version = %02X,  "
 890                                "identification = %06X,  "
 891                                "machine = %04X\n",
 892                                n, cpuinfo->cpu_id.version,
 893                                cpuinfo->cpu_id.ident,
 894                                cpuinfo->cpu_id.machine);
 895         }
 896         preempt_enable();
 897         return 0;
 898 }
 899
 900 static void *c_start(struct seq_file *m, loff_t *pos)
 901 {
 902         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 903 }
 904 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 905 {
 906         ++*pos;
 907         return c_start(m, pos);
 908 }
 909 static void c_stop(struct seq_file *m, void *v)
 910 {
 911 }
 912 const struct seq_operations cpuinfo_op = {
 913         .start  = c_start,
 914         .next   = c_next,
 915         .stop   = c_stop,
 916         .show   = show_cpuinfo,
 917 };
 918