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
  51 /*
  52  * Machine setup..
  53  */
  54 unsigned int console_mode = 0;
  55 unsigned int console_devno = -1;
  56 unsigned int console_irq = -1;
  57 unsigned long memory_size = 0;
  58 unsigned long machine_flags = 0;
  59 struct {
  60         unsigned long addr, size, type;
  61 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  62 #define CHUNK_READ_WRITE 0
  63 #define CHUNK_READ_ONLY 1
  64 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  65 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  66 static unsigned long __initdata memory_end;
  67
  68 /*
  69  * Setup options
  70  */
  71 extern int _text,_etext, _edata, _end;
  72
  73 /*
  74  * This is set up by the setup-routine at boot-time
  75  * for S390 need to find out, what we have to setup
  76  * using address 0x10400 ...
  77  */
  78
  79 #include <asm/setup.h>
  80
  81 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  82
  83 static struct resource code_resource = {
  84         .name  = "Kernel code",
  85         .start = (unsigned long) &_text,
  86         .end = (unsigned long) &_etext - 1,
  87         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  88 };
  89
  90 static struct resource data_resource = {
  91         .name = "Kernel data",
  92         .start = (unsigned long) &_etext,
  93         .end = (unsigned long) &_edata - 1,
  94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  95 };
  96
  97 /*
  98  * cpu_init() initializes state that is per-CPU.
  99  */
 100 void __devinit cpu_init (void)
 101 {
 102         int addr = hard_smp_processor_id();
 103
 104         /*
 105          * Store processor id in lowcore (used e.g. in timer_interrupt)
 106          */
 107         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 108         S390_lowcore.cpu_data.cpu_addr = addr;
 109
 110         /*
 111          * Force FPU initialization:
 112          */
 113         clear_thread_flag(TIF_USEDFPU);
 114         clear_used_math();
 115
 116         atomic_inc(&init_mm.mm_count);
 117         current->active_mm = &init_mm;
 118         if (current->mm)
 119                 BUG();
 120         enter_lazy_tlb(&init_mm, current);
 121 }
 122
 123 /*
 124  * VM halt and poweroff setup routines
 125  */
 126 char vmhalt_cmd[128] = "";
 127 char vmpoff_cmd[128] = "";
 128
 129 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 130 {
 131         int sx, dx;
 132
 133         dx = 0;
 134         for (sx = 0; src[sx] != 0; sx++) {
 135                 if (src[sx] == '"') continue;
 136                 dst[dx++] = src[sx];
 137                 if (dx >= n) break;
 138         }
 139 }
 140
 141 static int __init vmhalt_setup(char *str)
 142 {
 143         strncpy_skip_quote(vmhalt_cmd, str, 127);
 144         vmhalt_cmd[127] = 0;
 145         return 1;
 146 }
 147
 148 __setup("vmhalt=", vmhalt_setup);
 149
 150 static int __init vmpoff_setup(char *str)
 151 {
 152         strncpy_skip_quote(vmpoff_cmd, str, 127);
 153         vmpoff_cmd[127] = 0;
 154         return 1;
 155 }
 156
 157 __setup("vmpoff=", vmpoff_setup);
 158
 159 /*
 160  * condev= and conmode= setup parameter.
 161  */
 162
 163 static int __init condev_setup(char *str)
 164 {
 165         int vdev;
 166
 167         vdev = simple_strtoul(str, &str, 0);
 168         if (vdev >= 0 && vdev < 65536) {
 169                 console_devno = vdev;
 170                 console_irq = -1;
 171         }
 172         return 1;
 173 }
 174
 175 __setup("condev=", condev_setup);
 176
 177 static int __init conmode_setup(char *str)
 178 {
 179 #if defined(CONFIG_SCLP_CONSOLE)
 180         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 181                 SET_CONSOLE_SCLP;
 182 #endif
 183 #if defined(CONFIG_TN3215_CONSOLE)
 184         if (strncmp(str, "3215", 5) == 0)
 185                 SET_CONSOLE_3215;
 186 #endif
 187 #if defined(CONFIG_TN3270_CONSOLE)
 188         if (strncmp(str, "3270", 5) == 0)
 189                 SET_CONSOLE_3270;
 190 #endif
 191         return 1;
 192 }
 193
 194 __setup("conmode=", conmode_setup);
 195
 196 static void __init conmode_default(void)
 197 {
 198         char query_buffer[1024];
 199         char *ptr;
 200
 201         if (MACHINE_IS_VM) {
 202                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 203                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 204                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 205                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 206                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 207                 ptr = strstr(query_buffer, "CONMODE");
 208                 /*
 209                  * Set the conmode to 3215 so that the device recognition
 210                  * will set the cu_type of the console to 3215. If the
 211                  * conmode is 3270 and we don't set it back then both
 212                  * 3215 and the 3270 driver will try to access the console
 213                  * device (3215 as console and 3270 as normal tty).
 214                  */
 215                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 216                 if (ptr == NULL) {
 217 #if defined(CONFIG_SCLP_CONSOLE)
 218                         SET_CONSOLE_SCLP;
 219 #endif
 220                         return;
 221                 }
 222                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 223 #if defined(CONFIG_TN3270_CONSOLE)
 224                         SET_CONSOLE_3270;
 225 #elif defined(CONFIG_TN3215_CONSOLE)
 226                         SET_CONSOLE_3215;
 227 #elif defined(CONFIG_SCLP_CONSOLE)
 228                         SET_CONSOLE_SCLP;
 229 #endif
 230                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 231 #if defined(CONFIG_TN3215_CONSOLE)
 232                         SET_CONSOLE_3215;
 233 #elif defined(CONFIG_TN3270_CONSOLE)
 234                         SET_CONSOLE_3270;
 235 #elif defined(CONFIG_SCLP_CONSOLE)
 236                         SET_CONSOLE_SCLP;
 237 #endif
 238                 }
 239         } else if (MACHINE_IS_P390) {
 240 #if defined(CONFIG_TN3215_CONSOLE)
 241                 SET_CONSOLE_3215;
 242 #elif defined(CONFIG_TN3270_CONSOLE)
 243                 SET_CONSOLE_3270;
 244 #endif
 245         } else {
 246 #if defined(CONFIG_SCLP_CONSOLE)
 247                 SET_CONSOLE_SCLP;
 248 #endif
 249         }
 250 }
 251
 252 #ifdef CONFIG_SMP
 253 extern void machine_restart_smp(char *);
 254 extern void machine_halt_smp(void);
 255 extern void machine_power_off_smp(void);
 256
 257 void (*_machine_restart)(char *command) = machine_restart_smp;
 258 void (*_machine_halt)(void) = machine_halt_smp;
 259 void (*_machine_power_off)(void) = machine_power_off_smp;
 260 #else
 261 /*
 262  * Reboot, halt and power_off routines for non SMP.
 263  */
 264 extern void reipl(unsigned long devno);
 265 extern void reipl_diag(void);
 266 static void do_machine_restart_nonsmp(char * __unused)
 267 {
 268         reipl_diag();
 269
 270         if (MACHINE_IS_VM)
 271                 cpcmd ("IPL", NULL, 0);
 272         else
 273                 reipl (0x10000 | S390_lowcore.ipl_device);
 274 }
 275
 276 static void do_machine_halt_nonsmp(void)
 277 {
 278         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 279                 cpcmd(vmhalt_cmd, NULL, 0);
 280         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 281 }
 282
 283 static void do_machine_power_off_nonsmp(void)
 284 {
 285         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 286                 cpcmd(vmpoff_cmd, NULL, 0);
 287         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 288 }
 289
 290 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 291 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 292 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 293 #endif
 294
 295  /*
 296  * Reboot, halt and power_off stubs. They just call _machine_restart,
 297  * _machine_halt or _machine_power_off.
 298  */
 299
 300 void machine_restart(char *command)
 301 {
 302         console_unblank();
 303         _machine_restart(command);
 304 }
 305
 306 void machine_halt(void)
 307 {
 308         console_unblank();
 309         _machine_halt();
 310 }
 311
 312 void machine_power_off(void)
 313 {
 314         console_unblank();
 315         _machine_power_off();
 316 }
 317
 318 static void __init
 319 add_memory_hole(unsigned long start, unsigned long end)
 320 {
 321         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 322
 323         if (end <= dma_pfn)
 324                 zholes_size[ZONE_DMA] += end - start + 1;
 325         else if (start > dma_pfn)
 326                 zholes_size[ZONE_NORMAL] += end - start + 1;
 327         else {
 328                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 329                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 330         }
 331 }
 332
 333 static void __init
 334 parse_cmdline_early(char **cmdline_p)
 335 {
 336         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 337         unsigned long delay = 0;
 338
 339         /* Save unparsed command line copy for /proc/cmdline */
 340         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 341         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 342
 343         for (;;) {
 344                 /*
 345                  * "mem=XXX[kKmM]" sets memsize
 346                  */
 347                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 348                         memory_end = simple_strtoul(from+4, &from, 0);
 349                         if ( *from == 'K' || *from == 'k' ) {
 350                                 memory_end = memory_end << 10;
 351                                 from++;
 352                         } else if ( *from == 'M' || *from == 'm' ) {
 353                                 memory_end = memory_end << 20;
 354                                 from++;
 355                         }
 356                 }
 357                 /*
 358                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 359                  */
 360                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 361                         delay = simple_strtoul(from+9, &from, 0);
 362                         if (*from == 's' || *from == 'S') {
 363                                 delay = delay*1000000;
 364                                 from++;
 365                         } else if (*from == 'm' || *from == 'M') {
 366                                 delay = delay*60*1000000;
 367                                 from++;
 368                         }
 369                         /* now wait for the requested amount of time */
 370                         udelay(delay);
 371                 }
 372                 cn = *(from++);
 373                 if (!cn)
 374                         break;
 375                 if (cn == '\n')
 376                         cn = ' ';  /* replace newlines with space */
 377                 if (cn == 0x0d)
 378                         cn = ' ';  /* replace 0x0d with space */
 379                 if (cn == ' ' && c == ' ')
 380                         continue;  /* remove additional spaces */
 381                 c = cn;
 382                 if (to - command_line >= COMMAND_LINE_SIZE)
 383                         break;
 384                 *(to++) = c;
 385         }
 386         if (c == ' ' && to > command_line) to--;
 387         *to = '\0';
 388         *cmdline_p = command_line;
 389 }
 390
 391 static void __init
 392 setup_lowcore(void)
 393 {
 394         struct _lowcore *lc;
 395         int lc_pages;
 396
 397         /*
 398          * Setup lowcore for boot cpu
 399          */
 400         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 401         lc = (struct _lowcore *)
 402                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 403         memset(lc, 0, lc_pages * PAGE_SIZE);
 404         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 405         lc->restart_psw.addr =
 406                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 407         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 408         lc->external_new_psw.addr =
 409                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 410         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 411         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 412         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 413         lc->program_new_psw.addr =
 414                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 415         lc->mcck_new_psw.mask =
 416                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 417         lc->mcck_new_psw.addr =
 418                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 419         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 420         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 421         lc->ipl_device = S390_lowcore.ipl_device;
 422         lc->jiffy_timer = -1LL;
 423         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 424         lc->async_stack = (unsigned long)
 425                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 426         lc->panic_stack = (unsigned long)
 427                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 428         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 429         lc->thread_info = (unsigned long) &init_thread_union;
 430 #ifndef CONFIG_64BIT
 431         if (MACHINE_HAS_IEEE) {
 432                 lc->extended_save_area_addr = (__u32)
 433                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 434                 /* enable extended save area */
 435                 ctl_set_bit(14, 29);
 436         }
 437 #endif
 438         set_prefix((u32)(unsigned long) lc);
 439 }
 440
 441 static void __init
 442 setup_resources(void)
 443 {
 444         struct resource *res;
 445         int i;
 446
 447         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 448                 res = alloc_bootmem_low(sizeof(struct resource));
 449                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 450                 switch (memory_chunk[i].type) {
 451                 case CHUNK_READ_WRITE:
 452                         res->name = "System RAM";
 453                         break;
 454                 case CHUNK_READ_ONLY:
 455                         res->name = "System ROM";
 456                         res->flags |= IORESOURCE_READONLY;
 457                         break;
 458                 default:
 459                         res->name = "reserved";
 460                 }
 461                 res->start = memory_chunk[i].addr;
 462                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 463                 request_resource(&iomem_resource, res);
 464                 request_resource(res, &code_resource);
 465                 request_resource(res, &data_resource);
 466         }
 467 }
 468
 469 static void __init
 470 setup_memory(void)
 471 {
 472         unsigned long bootmap_size;
 473         unsigned long start_pfn, end_pfn, init_pfn;
 474         unsigned long last_rw_end;
 475         int i;
 476
 477         /*
 478          * partially used pages are not usable - thus
 479          * we are rounding upwards:
 480          */
 481         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 482         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 483
 484         /* Initialize storage key for kernel pages */
 485         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 486                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 487
 488         /*
 489          * Initialize the boot-time allocator (with low memory only):
 490          */
 491         bootmap_size = init_bootmem(start_pfn, end_pfn);
 492
 493         /*
 494          * Register RAM areas with the bootmem allocator.
 495          */
 496         last_rw_end = start_pfn;
 497
 498         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 499                 unsigned long start_chunk, end_chunk;
 500
 501                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 502                         continue;
 503                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 504                 start_chunk >>= PAGE_SHIFT;
 505                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 506                 end_chunk >>= PAGE_SHIFT;
 507                 if (start_chunk < start_pfn)
 508                         start_chunk = start_pfn;
 509                 if (end_chunk > end_pfn)
 510                         end_chunk = end_pfn;
 511                 if (start_chunk < end_chunk) {
 512                         /* Initialize storage key for RAM pages */
 513                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 514                              init_pfn++)
 515                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 516                                                      PAGE_DEFAULT_KEY);
 517                         free_bootmem(start_chunk << PAGE_SHIFT,
 518                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 519                         if (last_rw_end < start_chunk)
 520                                 add_memory_hole(last_rw_end, start_chunk - 1);
 521                         last_rw_end = end_chunk;
 522                 }
 523         }
 524
 525         psw_set_key(PAGE_DEFAULT_KEY);
 526
 527         if (last_rw_end < end_pfn - 1)
 528                 add_memory_hole(last_rw_end, end_pfn - 1);
 529
 530         /*
 531          * Reserve the bootmem bitmap itself as well. We do this in two
 532          * steps (first step was init_bootmem()) because this catches
 533          * the (very unlikely) case of us accidentally initializing the
 534          * bootmem allocator with an invalid RAM area.
 535          */
 536         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 537
 538 #ifdef CONFIG_BLK_DEV_INITRD
 539         if (INITRD_START) {
 540                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 541                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 542                         initrd_start = INITRD_START;
 543                         initrd_end = initrd_start + INITRD_SIZE;
 544                 } else {
 545                         printk("initrd extends beyond end of memory "
 546                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 547                                initrd_start + INITRD_SIZE, memory_end);
 548                         initrd_start = initrd_end = 0;
 549                 }
 550         }
 551 #endif
 552 }
 553
 554 /*
 555  * Setup function called from init/main.c just after the banner
 556  * was printed.
 557  */
 558
 559 void __init
 560 setup_arch(char **cmdline_p)
 561 {
 562         /*
 563          * print what head.S has found out about the machine
 564          */
 565 #ifndef CONFIG_64BIT
 566         printk((MACHINE_IS_VM) ?
 567                "We are running under VM (31 bit mode)\n" :
 568                "We are running native (31 bit mode)\n");
 569         printk((MACHINE_HAS_IEEE) ?
 570                "This machine has an IEEE fpu\n" :
 571                "This machine has no IEEE fpu\n");
 572 #else /* CONFIG_64BIT */
 573         printk((MACHINE_IS_VM) ?
 574                "We are running under VM (64 bit mode)\n" :
 575                "We are running native (64 bit mode)\n");
 576 #endif /* CONFIG_64BIT */
 577
 578         ROOT_DEV = Root_RAM0;
 579 #ifndef CONFIG_64BIT
 580         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 581         /*
 582          * We need some free virtual space to be able to do vmalloc.
 583          * On a machine with 2GB memory we make sure that we have at
 584          * least 128 MB free space for vmalloc.
 585          */
 586         if (memory_end > 1920*1024*1024)
 587                 memory_end = 1920*1024*1024;
 588 #else /* CONFIG_64BIT */
 589         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 590 #endif /* CONFIG_64BIT */
 591
 592         init_mm.start_code = PAGE_OFFSET;
 593         init_mm.end_code = (unsigned long) &_etext;
 594         init_mm.end_data = (unsigned long) &_edata;
 595         init_mm.brk = (unsigned long) &_end;
 596
 597         parse_cmdline_early(cmdline_p);
 598
 599         setup_memory();
 600         setup_resources();
 601         setup_lowcore();
 602
 603         cpu_init();
 604         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 605
 606         /*
 607          * Create kernel page tables and switch to virtual addressing.
 608          */
 609         paging_init();
 610
 611         /* Setup default console */
 612         conmode_default();
 613 }
 614
 615 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 616 {
 617    printk("cpu %d "
 618 #ifdef CONFIG_SMP
 619            "phys_idx=%d "
 620 #endif
 621            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 622            cpuinfo->cpu_nr,
 623 #ifdef CONFIG_SMP
 624            cpuinfo->cpu_addr,
 625 #endif
 626            cpuinfo->cpu_id.version,
 627            cpuinfo->cpu_id.ident,
 628            cpuinfo->cpu_id.machine,
 629            cpuinfo->cpu_id.unused);
 630 }
 631
 632 /*
 633  * show_cpuinfo - Get information on one CPU for use by procfs.
 634  */
 635
 636 static int show_cpuinfo(struct seq_file *m, void *v)
 637 {
 638         struct cpuinfo_S390 *cpuinfo;
 639         unsigned long n = (unsigned long) v - 1;
 640
 641         preempt_disable();
 642         if (!n) {
 643                 seq_printf(m, "vendor_id       : IBM/S390\n"
 644                                "# processors    : %i\n"
 645                                "bogomips per cpu: %lu.%02lu\n",
 646                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 647                                (loops_per_jiffy/(5000/HZ))%100);
 648         }
 649         if (cpu_online(n)) {
 650 #ifdef CONFIG_SMP
 651                 if (smp_processor_id() == n)
 652                         cpuinfo = &S390_lowcore.cpu_data;
 653                 else
 654                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 655 #else
 656                 cpuinfo = &S390_lowcore.cpu_data;
 657 #endif
 658                 seq_printf(m, "processor %li: "
 659                                "version = %02X,  "
 660                                "identification = %06X,  "
 661                                "machine = %04X\n",
 662                                n, cpuinfo->cpu_id.version,
 663                                cpuinfo->cpu_id.ident,
 664                                cpuinfo->cpu_id.machine);
 665         }
 666         preempt_enable();
 667         return 0;
 668 }
 669
 670 static void *c_start(struct seq_file *m, loff_t *pos)
 671 {
 672         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 673 }
 674 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 675 {
 676         ++*pos;
 677         return c_start(m, pos);
 678 }
 679 static void c_stop(struct seq_file *m, void *v)
 680 {
 681 }
 682 struct seq_operations cpuinfo_op = {
 683         .start  = c_start,
 684         .next   = c_next,
 685         .stop   = c_stop,
 686         .show   = show_cpuinfo,
 687 };
 688
 689 #define DEFINE_IPL_ATTR(_name, _format, _value)                 \
 690 static ssize_t ipl_##_name##_show(struct subsystem *subsys,     \
 691                 char *page)                                     \
 692 {                                                               \
 693         return sprintf(page, _format, _value);                  \
 694 }                                                               \
 695 static struct subsys_attribute ipl_##_name##_attr =             \
 696         __ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
 697
 698 DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
 699                 IPL_PARMBLOCK_START->fcp.wwpn);
 700 DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
 701                 IPL_PARMBLOCK_START->fcp.lun);
 702 DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
 703                 IPL_PARMBLOCK_START->fcp.bootprog);
 704 DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
 705                 IPL_PARMBLOCK_START->fcp.br_lba);
 706
 707 enum ipl_type_type {
 708         ipl_type_unknown,
 709         ipl_type_ccw,
 710         ipl_type_fcp,
 711 };
 712
 713 static enum ipl_type_type
 714 get_ipl_type(void)
 715 {
 716         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 717
 718         if (!IPL_DEVNO_VALID)
 719                 return ipl_type_unknown;
 720         if (!IPL_PARMBLOCK_VALID)
 721                 return ipl_type_ccw;
 722         if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
 723                 return ipl_type_unknown;
 724         if (ipl->fcp.pbt != IPL_TYPE_FCP)
 725                 return ipl_type_unknown;
 726         return ipl_type_fcp;
 727 }
 728
 729 static ssize_t
 730 ipl_type_show(struct subsystem *subsys, char *page)
 731 {
 732         switch (get_ipl_type()) {
 733         case ipl_type_ccw:
 734                 return sprintf(page, "ccw\n");
 735         case ipl_type_fcp:
 736                 return sprintf(page, "fcp\n");
 737         default:
 738                 return sprintf(page, "unknown\n");
 739         }
 740 }
 741
 742 static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
 743
 744 static ssize_t
 745 ipl_device_show(struct subsystem *subsys, char *page)
 746 {
 747         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 748
 749         switch (get_ipl_type()) {
 750         case ipl_type_ccw:
 751                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 752         case ipl_type_fcp:
 753                 return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
 754         default:
 755                 return 0;
 756         }
 757 }
 758
 759 static struct subsys_attribute ipl_device_attr =
 760         __ATTR(device, S_IRUGO, ipl_device_show, NULL);
 761
 762 static struct attribute *ipl_fcp_attrs[] = {
 763         &ipl_type_attr.attr,
 764         &ipl_device_attr.attr,
 765         &ipl_wwpn_attr.attr,
 766         &ipl_lun_attr.attr,
 767         &ipl_bootprog_attr.attr,
 768         &ipl_br_lba_attr.attr,
 769         NULL,
 770 };
 771
 772 static struct attribute_group ipl_fcp_attr_group = {
 773         .attrs = ipl_fcp_attrs,
 774 };
 775
 776 static struct attribute *ipl_ccw_attrs[] = {
 777         &ipl_type_attr.attr,
 778         &ipl_device_attr.attr,
 779         NULL,
 780 };
 781
 782 static struct attribute_group ipl_ccw_attr_group = {
 783         .attrs = ipl_ccw_attrs,
 784 };
 785
 786 static struct attribute *ipl_unknown_attrs[] = {
 787         &ipl_type_attr.attr,
 788         NULL,
 789 };
 790
 791 static struct attribute_group ipl_unknown_attr_group = {
 792         .attrs = ipl_unknown_attrs,
 793 };
 794
 795 static ssize_t
 796 ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
 797 {
 798         unsigned int size = IPL_PARMBLOCK_SIZE;
 799
 800         if (off > size)
 801                 return 0;
 802         if (off + count > size)
 803                 count = size - off;
 804
 805         memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
 806         return count;
 807 }
 808
 809 static struct bin_attribute ipl_parameter_attr = {
 810         .attr = {
 811                 .name = "binary_parameter",
 812                 .mode = S_IRUGO,
 813                 .owner = THIS_MODULE,
 814         },
 815         .size = PAGE_SIZE,
 816         .read = &ipl_parameter_read,
 817 };
 818
 819 static ssize_t
 820 ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
 821 {
 822         unsigned int size =  IPL_PARMBLOCK_START->fcp.scp_data_len;
 823         void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
 824
 825         if (off > size)
 826                 return 0;
 827         if (off + count > size)
 828                 count = size - off;
 829
 830         memcpy(buf, scp_data + off, count);
 831         return count;
 832 }
 833
 834 static struct bin_attribute ipl_scp_data_attr = {
 835         .attr = {
 836                 .name = "scp_data",
 837                 .mode = S_IRUGO,
 838                 .owner = THIS_MODULE,
 839         },
 840         .size = PAGE_SIZE,
 841         .read = &ipl_scp_data_read,
 842 };
 843
 844 static decl_subsys(ipl, NULL, NULL);
 845
 846 static int __init
 847 ipl_device_sysfs_register(void) {
 848         int rc;
 849
 850         rc = firmware_register(&ipl_subsys);
 851         if (rc)
 852                 return rc;
 853
 854         switch (get_ipl_type()) {
 855         case ipl_type_ccw:
 856                 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
 857                 break;
 858         case ipl_type_fcp:
 859                 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
 860                 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 861                                       &ipl_parameter_attr);
 862                 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 863                                       &ipl_scp_data_attr);
 864                 break;
 865         default:
 866                 sysfs_create_group(&ipl_subsys.kset.kobj,
 867                                    &ipl_unknown_attr_group);
 868                 break;
 869         }
 870         return 0;
 871 }
 872
 873 __initcall(ipl_device_sysfs_register);