arch/s390/kernel/setup.c

   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 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/config.h>
  32 #include <linux/init.h>
  33 #include <linux/initrd.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/root_dev.h>
  36 #include <linux/console.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/kernel_stat.h>
  39 #include <linux/device.h>
  40
  41 #include <asm/uaccess.h>
  42 #include <asm/system.h>
  43 #include <asm/smp.h>
  44 #include <asm/mmu_context.h>
  45 #include <asm/cpcmd.h>
  46 #include <asm/lowcore.h>
  47 #include <asm/irq.h>
  48 #include <asm/page.h>
  49 #include <asm/ptrace.h>
  50 #include <asm/sections.h>
  51
  52 /*
  53  * Machine setup..
  54  */
  55 unsigned int console_mode = 0;
  56 unsigned int console_devno = -1;
  57 unsigned int console_irq = -1;
  58 unsigned long memory_size = 0;
  59 unsigned long machine_flags = 0;
  60 struct {
  61         unsigned long addr, size, type;
  62 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  63 #define CHUNK_READ_WRITE 0
  64 #define CHUNK_READ_ONLY 1
  65 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  66 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  67 static unsigned long __initdata memory_end;
  68
  69 /*
  70  * This is set up by the setup-routine at boot-time
  71  * for S390 need to find out, what we have to setup
  72  * using address 0x10400 ...
  73  */
  74
  75 #include <asm/setup.h>
  76
  77 static struct resource code_resource = {
  78         .name  = "Kernel code",
  79         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  80 };
  81
  82 static struct resource data_resource = {
  83         .name = "Kernel data",
  84         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  85 };
  86
  87 /*
  88  * cpu_init() initializes state that is per-CPU.
  89  */
  90 void __devinit cpu_init (void)
  91 {
  92         int addr = hard_smp_processor_id();
  93
  94         /*
  95          * Store processor id in lowcore (used e.g. in timer_interrupt)
  96          */
  97         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
  98         S390_lowcore.cpu_data.cpu_addr = addr;
  99
 100         /*
 101          * Force FPU initialization:
 102          */
 103         clear_thread_flag(TIF_USEDFPU);
 104         clear_used_math();
 105
 106         atomic_inc(&init_mm.mm_count);
 107         current->active_mm = &init_mm;
 108         if (current->mm)
 109                 BUG();
 110         enter_lazy_tlb(&init_mm, current);
 111 }
 112
 113 /*
 114  * VM halt and poweroff setup routines
 115  */
 116 char vmhalt_cmd[128] = "";
 117 char vmpoff_cmd[128] = "";
 118
 119 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 120 {
 121         int sx, dx;
 122
 123         dx = 0;
 124         for (sx = 0; src[sx] != 0; sx++) {
 125                 if (src[sx] == '"') continue;
 126                 dst[dx++] = src[sx];
 127                 if (dx >= n) break;
 128         }
 129 }
 130
 131 static int __init vmhalt_setup(char *str)
 132 {
 133         strncpy_skip_quote(vmhalt_cmd, str, 127);
 134         vmhalt_cmd[127] = 0;
 135         return 1;
 136 }
 137
 138 __setup("vmhalt=", vmhalt_setup);
 139
 140 static int __init vmpoff_setup(char *str)
 141 {
 142         strncpy_skip_quote(vmpoff_cmd, str, 127);
 143         vmpoff_cmd[127] = 0;
 144         return 1;
 145 }
 146
 147 __setup("vmpoff=", vmpoff_setup);
 148
 149 /*
 150  * condev= and conmode= setup parameter.
 151  */
 152
 153 static int __init condev_setup(char *str)
 154 {
 155         int vdev;
 156
 157         vdev = simple_strtoul(str, &str, 0);
 158         if (vdev >= 0 && vdev < 65536) {
 159                 console_devno = vdev;
 160                 console_irq = -1;
 161         }
 162         return 1;
 163 }
 164
 165 __setup("condev=", condev_setup);
 166
 167 static int __init conmode_setup(char *str)
 168 {
 169 #if defined(CONFIG_SCLP_CONSOLE)
 170         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 171                 SET_CONSOLE_SCLP;
 172 #endif
 173 #if defined(CONFIG_TN3215_CONSOLE)
 174         if (strncmp(str, "3215", 5) == 0)
 175                 SET_CONSOLE_3215;
 176 #endif
 177 #if defined(CONFIG_TN3270_CONSOLE)
 178         if (strncmp(str, "3270", 5) == 0)
 179                 SET_CONSOLE_3270;
 180 #endif
 181         return 1;
 182 }
 183
 184 __setup("conmode=", conmode_setup);
 185
 186 static void __init conmode_default(void)
 187 {
 188         char query_buffer[1024];
 189         char *ptr;
 190
 191         if (MACHINE_IS_VM) {
 192                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 193                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 194                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 195                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 196                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 197                 ptr = strstr(query_buffer, "CONMODE");
 198                 /*
 199                  * Set the conmode to 3215 so that the device recognition
 200                  * will set the cu_type of the console to 3215. If the
 201                  * conmode is 3270 and we don't set it back then both
 202                  * 3215 and the 3270 driver will try to access the console
 203                  * device (3215 as console and 3270 as normal tty).
 204                  */
 205                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 206                 if (ptr == NULL) {
 207 #if defined(CONFIG_SCLP_CONSOLE)
 208                         SET_CONSOLE_SCLP;
 209 #endif
 210                         return;
 211                 }
 212                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 213 #if defined(CONFIG_TN3270_CONSOLE)
 214                         SET_CONSOLE_3270;
 215 #elif defined(CONFIG_TN3215_CONSOLE)
 216                         SET_CONSOLE_3215;
 217 #elif defined(CONFIG_SCLP_CONSOLE)
 218                         SET_CONSOLE_SCLP;
 219 #endif
 220                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 221 #if defined(CONFIG_TN3215_CONSOLE)
 222                         SET_CONSOLE_3215;
 223 #elif defined(CONFIG_TN3270_CONSOLE)
 224                         SET_CONSOLE_3270;
 225 #elif defined(CONFIG_SCLP_CONSOLE)
 226                         SET_CONSOLE_SCLP;
 227 #endif
 228                 }
 229         } else if (MACHINE_IS_P390) {
 230 #if defined(CONFIG_TN3215_CONSOLE)
 231                 SET_CONSOLE_3215;
 232 #elif defined(CONFIG_TN3270_CONSOLE)
 233                 SET_CONSOLE_3270;
 234 #endif
 235         } else {
 236 #if defined(CONFIG_SCLP_CONSOLE)
 237                 SET_CONSOLE_SCLP;
 238 #endif
 239         }
 240 }
 241
 242 #ifdef CONFIG_SMP
 243 extern void machine_restart_smp(char *);
 244 extern void machine_halt_smp(void);
 245 extern void machine_power_off_smp(void);
 246
 247 void (*_machine_restart)(char *command) = machine_restart_smp;
 248 void (*_machine_halt)(void) = machine_halt_smp;
 249 void (*_machine_power_off)(void) = machine_power_off_smp;
 250 #else
 251 /*
 252  * Reboot, halt and power_off routines for non SMP.
 253  */
 254 extern void reipl(unsigned long devno);
 255 extern void reipl_diag(void);
 256 static void do_machine_restart_nonsmp(char * __unused)
 257 {
 258         reipl_diag();
 259
 260         if (MACHINE_IS_VM)
 261                 cpcmd ("IPL", NULL, 0, NULL);
 262         else
 263                 reipl (0x10000 | S390_lowcore.ipl_device);
 264 }
 265
 266 static void do_machine_halt_nonsmp(void)
 267 {
 268         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 269                 cpcmd(vmhalt_cmd, NULL, 0, NULL);
 270         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 271 }
 272
 273 static void do_machine_power_off_nonsmp(void)
 274 {
 275         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 276                 cpcmd(vmpoff_cmd, NULL, 0, NULL);
 277         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 278 }
 279
 280 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 281 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 282 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 283 #endif
 284
 285  /*
 286  * Reboot, halt and power_off stubs. They just call _machine_restart,
 287  * _machine_halt or _machine_power_off.
 288  */
 289
 290 void machine_restart(char *command)
 291 {
 292         console_unblank();
 293         _machine_restart(command);
 294 }
 295
 296 void machine_halt(void)
 297 {
 298         console_unblank();
 299         _machine_halt();
 300 }
 301
 302 void machine_power_off(void)
 303 {
 304         console_unblank();
 305         _machine_power_off();
 306 }
 307
 308 /*
 309  * Dummy power off function.
 310  */
 311 void (*pm_power_off)(void) = machine_power_off;
 312
 313 static void __init
 314 add_memory_hole(unsigned long start, unsigned long end)
 315 {
 316         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 317
 318         if (end <= dma_pfn)
 319                 zholes_size[ZONE_DMA] += end - start + 1;
 320         else if (start > dma_pfn)
 321                 zholes_size[ZONE_NORMAL] += end - start + 1;
 322         else {
 323                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 324                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 325         }
 326 }
 327
 328 static int __init early_parse_mem(char *p)
 329 {
 330         memory_end = memparse(p, &p);
 331         return 0;
 332 }
 333 early_param("mem", early_parse_mem);
 334
 335 /*
 336  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 337  */
 338 static int __init early_parse_ipldelay(char *p)
 339 {
 340         unsigned long delay = 0;
 341
 342         delay = simple_strtoul(p, &p, 0);
 343
 344         switch (*p) {
 345         case 's':
 346         case 'S':
 347                 delay *= 1000000;
 348                 break;
 349         case 'm':
 350         case 'M':
 351                 delay *= 60 * 1000000;
 352         }
 353
 354         /* now wait for the requested amount of time */
 355         udelay(delay);
 356
 357         return 0;
 358 }
 359 early_param("ipldelay", early_parse_ipldelay);
 360
 361 static void __init
 362 setup_lowcore(void)
 363 {
 364         struct _lowcore *lc;
 365         int lc_pages;
 366
 367         /*
 368          * Setup lowcore for boot cpu
 369          */
 370         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 371         lc = (struct _lowcore *)
 372                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 373         memset(lc, 0, lc_pages * PAGE_SIZE);
 374         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 375         lc->restart_psw.addr =
 376                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 377         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 378         lc->external_new_psw.addr =
 379                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 380         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 381         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 382         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 383         lc->program_new_psw.addr =
 384                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 385         lc->mcck_new_psw.mask =
 386                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 387         lc->mcck_new_psw.addr =
 388                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 389         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 390         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 391         lc->ipl_device = S390_lowcore.ipl_device;
 392         lc->jiffy_timer = -1LL;
 393         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 394         lc->async_stack = (unsigned long)
 395                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 396         lc->panic_stack = (unsigned long)
 397                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 398         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 399         lc->thread_info = (unsigned long) &init_thread_union;
 400 #ifndef CONFIG_64BIT
 401         if (MACHINE_HAS_IEEE) {
 402                 lc->extended_save_area_addr = (__u32)
 403                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 404                 /* enable extended save area */
 405                 ctl_set_bit(14, 29);
 406         }
 407 #endif
 408         set_prefix((u32)(unsigned long) lc);
 409 }
 410
 411 static void __init
 412 setup_resources(void)
 413 {
 414         struct resource *res;
 415         int i;
 416
 417         code_resource.start = (unsigned long) &_text;
 418         code_resource.end = (unsigned long) &_etext - 1;
 419         data_resource.start = (unsigned long) &_etext;
 420         data_resource.end = (unsigned long) &_edata - 1;
 421
 422         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 423                 res = alloc_bootmem_low(sizeof(struct resource));
 424                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 425                 switch (memory_chunk[i].type) {
 426                 case CHUNK_READ_WRITE:
 427                         res->name = "System RAM";
 428                         break;
 429                 case CHUNK_READ_ONLY:
 430                         res->name = "System ROM";
 431                         res->flags |= IORESOURCE_READONLY;
 432                         break;
 433                 default:
 434                         res->name = "reserved";
 435                 }
 436                 res->start = memory_chunk[i].addr;
 437                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 438                 request_resource(&iomem_resource, res);
 439                 request_resource(res, &code_resource);
 440                 request_resource(res, &data_resource);
 441         }
 442 }
 443
 444 static void __init
 445 setup_memory(void)
 446 {
 447         unsigned long bootmap_size;
 448         unsigned long start_pfn, end_pfn, init_pfn;
 449         unsigned long last_rw_end;
 450         int i;
 451
 452         /*
 453          * partially used pages are not usable - thus
 454          * we are rounding upwards:
 455          */
 456         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 457         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 458
 459         /* Initialize storage key for kernel pages */
 460         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 461                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 462
 463         /*
 464          * Initialize the boot-time allocator (with low memory only):
 465          */
 466         bootmap_size = init_bootmem(start_pfn, end_pfn);
 467
 468         /*
 469          * Register RAM areas with the bootmem allocator.
 470          */
 471         last_rw_end = start_pfn;
 472
 473         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 474                 unsigned long start_chunk, end_chunk;
 475
 476                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 477                         continue;
 478                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 479                 start_chunk >>= PAGE_SHIFT;
 480                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 481                 end_chunk >>= PAGE_SHIFT;
 482                 if (start_chunk < start_pfn)
 483                         start_chunk = start_pfn;
 484                 if (end_chunk > end_pfn)
 485                         end_chunk = end_pfn;
 486                 if (start_chunk < end_chunk) {
 487                         /* Initialize storage key for RAM pages */
 488                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 489                              init_pfn++)
 490                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 491                                                      PAGE_DEFAULT_KEY);
 492                         free_bootmem(start_chunk << PAGE_SHIFT,
 493                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 494                         if (last_rw_end < start_chunk)
 495                                 add_memory_hole(last_rw_end, start_chunk - 1);
 496                         last_rw_end = end_chunk;
 497                 }
 498         }
 499
 500         psw_set_key(PAGE_DEFAULT_KEY);
 501
 502         if (last_rw_end < end_pfn - 1)
 503                 add_memory_hole(last_rw_end, end_pfn - 1);
 504
 505         /*
 506          * Reserve the bootmem bitmap itself as well. We do this in two
 507          * steps (first step was init_bootmem()) because this catches
 508          * the (very unlikely) case of us accidentally initializing the
 509          * bootmem allocator with an invalid RAM area.
 510          */
 511         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 512
 513 #ifdef CONFIG_BLK_DEV_INITRD
 514         if (INITRD_START) {
 515                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 516                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 517                         initrd_start = INITRD_START;
 518                         initrd_end = initrd_start + INITRD_SIZE;
 519                 } else {
 520                         printk("initrd extends beyond end of memory "
 521                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 522                                initrd_start + INITRD_SIZE, memory_end);
 523                         initrd_start = initrd_end = 0;
 524                 }
 525         }
 526 #endif
 527 }
 528
 529 /*
 530  * Setup function called from init/main.c just after the banner
 531  * was printed.
 532  */
 533
 534 void __init
 535 setup_arch(char **cmdline_p)
 536 {
 537         /*
 538          * print what head.S has found out about the machine
 539          */
 540 #ifndef CONFIG_64BIT
 541         printk((MACHINE_IS_VM) ?
 542                "We are running under VM (31 bit mode)\n" :
 543                "We are running native (31 bit mode)\n");
 544         printk((MACHINE_HAS_IEEE) ?
 545                "This machine has an IEEE fpu\n" :
 546                "This machine has no IEEE fpu\n");
 547 #else /* CONFIG_64BIT */
 548         printk((MACHINE_IS_VM) ?
 549                "We are running under VM (64 bit mode)\n" :
 550                "We are running native (64 bit mode)\n");
 551 #endif /* CONFIG_64BIT */
 552
 553         /* Save unparsed command line copy for /proc/cmdline */
 554         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 555
 556         *cmdline_p = COMMAND_LINE;
 557         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 558
 559         ROOT_DEV = Root_RAM0;
 560
 561         init_mm.start_code = PAGE_OFFSET;
 562         init_mm.end_code = (unsigned long) &_etext;
 563         init_mm.end_data = (unsigned long) &_edata;
 564         init_mm.brk = (unsigned long) &_end;
 565
 566         memory_end = memory_size;
 567
 568         parse_early_param();
 569
 570 #ifndef CONFIG_64BIT
 571         memory_end &= ~0x400000UL;
 572
 573         /*
 574          * We need some free virtual space to be able to do vmalloc.
 575          * On a machine with 2GB memory we make sure that we have at
 576          * least 128 MB free space for vmalloc.
 577          */
 578         if (memory_end > 1920*1024*1024)
 579                 memory_end = 1920*1024*1024;
 580 #else /* CONFIG_64BIT */
 581         memory_end &= ~0x200000UL;
 582 #endif /* CONFIG_64BIT */
 583
 584         setup_memory();
 585         setup_resources();
 586         setup_lowcore();
 587
 588         cpu_init();
 589         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 590         smp_setup_cpu_possible_map();
 591
 592         /*
 593          * Create kernel page tables and switch to virtual addressing.
 594          */
 595         paging_init();
 596
 597         /* Setup default console */
 598         conmode_default();
 599 }
 600
 601 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 602 {
 603    printk("cpu %d "
 604 #ifdef CONFIG_SMP
 605            "phys_idx=%d "
 606 #endif
 607            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 608            cpuinfo->cpu_nr,
 609 #ifdef CONFIG_SMP
 610            cpuinfo->cpu_addr,
 611 #endif
 612            cpuinfo->cpu_id.version,
 613            cpuinfo->cpu_id.ident,
 614            cpuinfo->cpu_id.machine,
 615            cpuinfo->cpu_id.unused);
 616 }
 617
 618 /*
 619  * show_cpuinfo - Get information on one CPU for use by procfs.
 620  */
 621
 622 static int show_cpuinfo(struct seq_file *m, void *v)
 623 {
 624         struct cpuinfo_S390 *cpuinfo;
 625         unsigned long n = (unsigned long) v - 1;
 626
 627         preempt_disable();
 628         if (!n) {
 629                 seq_printf(m, "vendor_id       : IBM/S390\n"
 630                                "# processors    : %i\n"
 631                                "bogomips per cpu: %lu.%02lu\n",
 632                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 633                                (loops_per_jiffy/(5000/HZ))%100);
 634         }
 635         if (cpu_online(n)) {
 636 #ifdef CONFIG_SMP
 637                 if (smp_processor_id() == n)
 638                         cpuinfo = &S390_lowcore.cpu_data;
 639                 else
 640                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 641 #else
 642                 cpuinfo = &S390_lowcore.cpu_data;
 643 #endif
 644                 seq_printf(m, "processor %li: "
 645                                "version = %02X,  "
 646                                "identification = %06X,  "
 647                                "machine = %04X\n",
 648                                n, cpuinfo->cpu_id.version,
 649                                cpuinfo->cpu_id.ident,
 650                                cpuinfo->cpu_id.machine);
 651         }
 652         preempt_enable();
 653         return 0;
 654 }
 655
 656 static void *c_start(struct seq_file *m, loff_t *pos)
 657 {
 658         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 659 }
 660 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 661 {
 662         ++*pos;
 663         return c_start(m, pos);
 664 }
 665 static void c_stop(struct seq_file *m, void *v)
 666 {
 667 }
 668 struct seq_operations cpuinfo_op = {
 669         .start  = c_start,
 670         .next   = c_next,
 671         .stop   = c_stop,
 672         .show   = show_cpuinfo,
 673 };
 674
 675 #define DEFINE_IPL_ATTR(_name, _format, _value)                 \
 676 static ssize_t ipl_##_name##_show(struct subsystem *subsys,     \
 677                 char *page)                                     \
 678 {                                                               \
 679         return sprintf(page, _format, _value);                  \
 680 }                                                               \
 681 static struct subsys_attribute ipl_##_name##_attr =             \
 682         __ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
 683
 684 DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
 685                 IPL_PARMBLOCK_START->fcp.wwpn);
 686 DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
 687                 IPL_PARMBLOCK_START->fcp.lun);
 688 DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
 689                 IPL_PARMBLOCK_START->fcp.bootprog);
 690 DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
 691                 IPL_PARMBLOCK_START->fcp.br_lba);
 692
 693 enum ipl_type_type {
 694         ipl_type_unknown,
 695         ipl_type_ccw,
 696         ipl_type_fcp,
 697 };
 698
 699 static enum ipl_type_type
 700 get_ipl_type(void)
 701 {
 702         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 703
 704         if (!IPL_DEVNO_VALID)
 705                 return ipl_type_unknown;
 706         if (!IPL_PARMBLOCK_VALID)
 707                 return ipl_type_ccw;
 708         if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
 709                 return ipl_type_unknown;
 710         if (ipl->fcp.pbt != IPL_TYPE_FCP)
 711                 return ipl_type_unknown;
 712         return ipl_type_fcp;
 713 }
 714
 715 static ssize_t
 716 ipl_type_show(struct subsystem *subsys, char *page)
 717 {
 718         switch (get_ipl_type()) {
 719         case ipl_type_ccw:
 720                 return sprintf(page, "ccw\n");
 721         case ipl_type_fcp:
 722                 return sprintf(page, "fcp\n");
 723         default:
 724                 return sprintf(page, "unknown\n");
 725         }
 726 }
 727
 728 static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
 729
 730 static ssize_t
 731 ipl_device_show(struct subsystem *subsys, char *page)
 732 {
 733         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 734
 735         switch (get_ipl_type()) {
 736         case ipl_type_ccw:
 737                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 738         case ipl_type_fcp:
 739                 return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
 740         default:
 741                 return 0;
 742         }
 743 }
 744
 745 static struct subsys_attribute ipl_device_attr =
 746         __ATTR(device, S_IRUGO, ipl_device_show, NULL);
 747
 748 static struct attribute *ipl_fcp_attrs[] = {
 749         &ipl_type_attr.attr,
 750         &ipl_device_attr.attr,
 751         &ipl_wwpn_attr.attr,
 752         &ipl_lun_attr.attr,
 753         &ipl_bootprog_attr.attr,
 754         &ipl_br_lba_attr.attr,
 755         NULL,
 756 };
 757
 758 static struct attribute_group ipl_fcp_attr_group = {
 759         .attrs = ipl_fcp_attrs,
 760 };
 761
 762 static struct attribute *ipl_ccw_attrs[] = {
 763         &ipl_type_attr.attr,
 764         &ipl_device_attr.attr,
 765         NULL,
 766 };
 767
 768 static struct attribute_group ipl_ccw_attr_group = {
 769         .attrs = ipl_ccw_attrs,
 770 };
 771
 772 static struct attribute *ipl_unknown_attrs[] = {
 773         &ipl_type_attr.attr,
 774         NULL,
 775 };
 776
 777 static struct attribute_group ipl_unknown_attr_group = {
 778         .attrs = ipl_unknown_attrs,
 779 };
 780
 781 static ssize_t
 782 ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
 783 {
 784         unsigned int size = IPL_PARMBLOCK_SIZE;
 785
 786         if (off > size)
 787                 return 0;
 788         if (off + count > size)
 789                 count = size - off;
 790
 791         memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
 792         return count;
 793 }
 794
 795 static struct bin_attribute ipl_parameter_attr = {
 796         .attr = {
 797                 .name = "binary_parameter",
 798                 .mode = S_IRUGO,
 799                 .owner = THIS_MODULE,
 800         },
 801         .size = PAGE_SIZE,
 802         .read = &ipl_parameter_read,
 803 };
 804
 805 static ssize_t
 806 ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
 807 {
 808         unsigned int size =  IPL_PARMBLOCK_START->fcp.scp_data_len;
 809         void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
 810
 811         if (off > size)
 812                 return 0;
 813         if (off + count > size)
 814                 count = size - off;
 815
 816         memcpy(buf, scp_data + off, count);
 817         return count;
 818 }
 819
 820 static struct bin_attribute ipl_scp_data_attr = {
 821         .attr = {
 822                 .name = "scp_data",
 823                 .mode = S_IRUGO,
 824                 .owner = THIS_MODULE,
 825         },
 826         .size = PAGE_SIZE,
 827         .read = &ipl_scp_data_read,
 828 };
 829
 830 static decl_subsys(ipl, NULL, NULL);
 831
 832 static int __init
 833 ipl_device_sysfs_register(void) {
 834         int rc;
 835
 836         rc = firmware_register(&ipl_subsys);
 837         if (rc)
 838                 return rc;
 839
 840         switch (get_ipl_type()) {
 841         case ipl_type_ccw:
 842                 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
 843                 break;
 844         case ipl_type_fcp:
 845                 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
 846                 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 847                                       &ipl_parameter_attr);
 848                 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 849                                       &ipl_scp_data_attr);
 850                 break;
 851         default:
 852                 sysfs_create_group(&ipl_subsys.kset.kobj,
 853                                    &ipl_unknown_attr_group);
 854                 break;
 855         }
 856         return 0;
 857 }
 858
 859 __initcall(ipl_device_sysfs_register);