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
  40 #include <asm/uaccess.h>
  41 #include <asm/system.h>
  42 #include <asm/smp.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/cpcmd.h>
  45 #include <asm/lowcore.h>
  46 #include <asm/irq.h>
  47 #include <asm/page.h>
  48 #include <asm/ptrace.h>
  49
  50 /*
  51  * Machine setup..
  52  */
  53 unsigned int console_mode = 0;
  54 unsigned int console_devno = -1;
  55 unsigned int console_irq = -1;
  56 unsigned long memory_size = 0;
  57 unsigned long machine_flags = 0;
  58 struct {
  59         unsigned long addr, size, type;
  60 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  61 #define CHUNK_READ_WRITE 0
  62 #define CHUNK_READ_ONLY 1
  63 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  64 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  65 static unsigned long __initdata memory_end;
  66
  67 /*
  68  * Setup options
  69  */
  70 extern int _text,_etext, _edata, _end;
  71
  72 /*
  73  * This is set up by the setup-routine at boot-time
  74  * for S390 need to find out, what we have to setup
  75  * using address 0x10400 ...
  76  */
  77
  78 #include <asm/setup.h>
  79
  80 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  81
  82 static struct resource code_resource = {
  83         .name  = "Kernel code",
  84         .start = (unsigned long) &_text,
  85         .end = (unsigned long) &_etext - 1,
  86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 static struct resource data_resource = {
  90         .name = "Kernel data",
  91         .start = (unsigned long) &_etext,
  92         .end = (unsigned long) &_edata - 1,
  93         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  94 };
  95
  96 /*
  97  * cpu_init() initializes state that is per-CPU.
  98  */
  99 void __devinit cpu_init (void)
 100 {
 101         int addr = hard_smp_processor_id();
 102
 103         /*
 104          * Store processor id in lowcore (used e.g. in timer_interrupt)
 105          */
 106         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 107         S390_lowcore.cpu_data.cpu_addr = addr;
 108
 109         /*
 110          * Force FPU initialization:
 111          */
 112         clear_thread_flag(TIF_USEDFPU);
 113         clear_used_math();
 114
 115         atomic_inc(&init_mm.mm_count);
 116         current->active_mm = &init_mm;
 117         if (current->mm)
 118                 BUG();
 119         enter_lazy_tlb(&init_mm, current);
 120 }
 121
 122 /*
 123  * VM halt and poweroff setup routines
 124  */
 125 char vmhalt_cmd[128] = "";
 126 char vmpoff_cmd[128] = "";
 127
 128 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 129 {
 130         int sx, dx;
 131
 132         dx = 0;
 133         for (sx = 0; src[sx] != 0; sx++) {
 134                 if (src[sx] == '"') continue;
 135                 dst[dx++] = src[sx];
 136                 if (dx >= n) break;
 137         }
 138 }
 139
 140 static int __init vmhalt_setup(char *str)
 141 {
 142         strncpy_skip_quote(vmhalt_cmd, str, 127);
 143         vmhalt_cmd[127] = 0;
 144         return 1;
 145 }
 146
 147 __setup("vmhalt=", vmhalt_setup);
 148
 149 static int __init vmpoff_setup(char *str)
 150 {
 151         strncpy_skip_quote(vmpoff_cmd, str, 127);
 152         vmpoff_cmd[127] = 0;
 153         return 1;
 154 }
 155
 156 __setup("vmpoff=", vmpoff_setup);
 157
 158 /*
 159  * condev= and conmode= setup parameter.
 160  */
 161
 162 static int __init condev_setup(char *str)
 163 {
 164         int vdev;
 165
 166         vdev = simple_strtoul(str, &str, 0);
 167         if (vdev >= 0 && vdev < 65536) {
 168                 console_devno = vdev;
 169                 console_irq = -1;
 170         }
 171         return 1;
 172 }
 173
 174 __setup("condev=", condev_setup);
 175
 176 static int __init conmode_setup(char *str)
 177 {
 178 #if defined(CONFIG_SCLP_CONSOLE)
 179         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 180                 SET_CONSOLE_SCLP;
 181 #endif
 182 #if defined(CONFIG_TN3215_CONSOLE)
 183         if (strncmp(str, "3215", 5) == 0)
 184                 SET_CONSOLE_3215;
 185 #endif
 186 #if defined(CONFIG_TN3270_CONSOLE)
 187         if (strncmp(str, "3270", 5) == 0)
 188                 SET_CONSOLE_3270;
 189 #endif
 190         return 1;
 191 }
 192
 193 __setup("conmode=", conmode_setup);
 194
 195 static void __init conmode_default(void)
 196 {
 197         char query_buffer[1024];
 198         char *ptr;
 199
 200         if (MACHINE_IS_VM) {
 201                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 202                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 203                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 204                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 205                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 206                 ptr = strstr(query_buffer, "CONMODE");
 207                 /*
 208                  * Set the conmode to 3215 so that the device recognition
 209                  * will set the cu_type of the console to 3215. If the
 210                  * conmode is 3270 and we don't set it back then both
 211                  * 3215 and the 3270 driver will try to access the console
 212                  * device (3215 as console and 3270 as normal tty).
 213                  */
 214                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 215                 if (ptr == NULL) {
 216 #if defined(CONFIG_SCLP_CONSOLE)
 217                         SET_CONSOLE_SCLP;
 218 #endif
 219                         return;
 220                 }
 221                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 222 #if defined(CONFIG_TN3270_CONSOLE)
 223                         SET_CONSOLE_3270;
 224 #elif defined(CONFIG_TN3215_CONSOLE)
 225                         SET_CONSOLE_3215;
 226 #elif defined(CONFIG_SCLP_CONSOLE)
 227                         SET_CONSOLE_SCLP;
 228 #endif
 229                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 230 #if defined(CONFIG_TN3215_CONSOLE)
 231                         SET_CONSOLE_3215;
 232 #elif defined(CONFIG_TN3270_CONSOLE)
 233                         SET_CONSOLE_3270;
 234 #elif defined(CONFIG_SCLP_CONSOLE)
 235                         SET_CONSOLE_SCLP;
 236 #endif
 237                 }
 238         } else if (MACHINE_IS_P390) {
 239 #if defined(CONFIG_TN3215_CONSOLE)
 240                 SET_CONSOLE_3215;
 241 #elif defined(CONFIG_TN3270_CONSOLE)
 242                 SET_CONSOLE_3270;
 243 #endif
 244         } else {
 245 #if defined(CONFIG_SCLP_CONSOLE)
 246                 SET_CONSOLE_SCLP;
 247 #endif
 248         }
 249 }
 250
 251 #ifdef CONFIG_SMP
 252 extern void machine_restart_smp(char *);
 253 extern void machine_halt_smp(void);
 254 extern void machine_power_off_smp(void);
 255
 256 void (*_machine_restart)(char *command) = machine_restart_smp;
 257 void (*_machine_halt)(void) = machine_halt_smp;
 258 void (*_machine_power_off)(void) = machine_power_off_smp;
 259 #else
 260 /*
 261  * Reboot, halt and power_off routines for non SMP.
 262  */
 263 extern void reipl(unsigned long devno);
 264 extern void reipl_diag(void);
 265 static void do_machine_restart_nonsmp(char * __unused)
 266 {
 267         reipl_diag();
 268
 269         if (MACHINE_IS_VM)
 270                 cpcmd ("IPL", NULL, 0);
 271         else
 272                 reipl (0x10000 | S390_lowcore.ipl_device);
 273 }
 274
 275 static void do_machine_halt_nonsmp(void)
 276 {
 277         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 278                 cpcmd(vmhalt_cmd, NULL, 0);
 279         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 280 }
 281
 282 static void do_machine_power_off_nonsmp(void)
 283 {
 284         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 285                 cpcmd(vmpoff_cmd, NULL, 0);
 286         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 287 }
 288
 289 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 290 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 291 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 292 #endif
 293
 294  /*
 295  * Reboot, halt and power_off stubs. They just call _machine_restart,
 296  * _machine_halt or _machine_power_off.
 297  */
 298
 299 void machine_restart(char *command)
 300 {
 301         console_unblank();
 302         _machine_restart(command);
 303 }
 304
 305 void machine_halt(void)
 306 {
 307         console_unblank();
 308         _machine_halt();
 309 }
 310
 311 void machine_power_off(void)
 312 {
 313         console_unblank();
 314         _machine_power_off();
 315 }
 316
 317 static void __init
 318 add_memory_hole(unsigned long start, unsigned long end)
 319 {
 320         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 321
 322         if (end <= dma_pfn)
 323                 zholes_size[ZONE_DMA] += end - start + 1;
 324         else if (start > dma_pfn)
 325                 zholes_size[ZONE_NORMAL] += end - start + 1;
 326         else {
 327                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 328                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 329         }
 330 }
 331
 332 static void __init
 333 parse_cmdline_early(char **cmdline_p)
 334 {
 335         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 336         unsigned long delay = 0;
 337
 338         /* Save unparsed command line copy for /proc/cmdline */
 339         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 340         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 341
 342         for (;;) {
 343                 /*
 344                  * "mem=XXX[kKmM]" sets memsize
 345                  */
 346                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 347                         memory_end = simple_strtoul(from+4, &from, 0);
 348                         if ( *from == 'K' || *from == 'k' ) {
 349                                 memory_end = memory_end << 10;
 350                                 from++;
 351                         } else if ( *from == 'M' || *from == 'm' ) {
 352                                 memory_end = memory_end << 20;
 353                                 from++;
 354                         }
 355                 }
 356                 /*
 357                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 358                  */
 359                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 360                         delay = simple_strtoul(from+9, &from, 0);
 361                         if (*from == 's' || *from == 'S') {
 362                                 delay = delay*1000000;
 363                                 from++;
 364                         } else if (*from == 'm' || *from == 'M') {
 365                                 delay = delay*60*1000000;
 366                                 from++;
 367                         }
 368                         /* now wait for the requested amount of time */
 369                         udelay(delay);
 370                 }
 371                 cn = *(from++);
 372                 if (!cn)
 373                         break;
 374                 if (cn == '\n')
 375                         cn = ' ';  /* replace newlines with space */
 376                 if (cn == 0x0d)
 377                         cn = ' ';  /* replace 0x0d with space */
 378                 if (cn == ' ' && c == ' ')
 379                         continue;  /* remove additional spaces */
 380                 c = cn;
 381                 if (to - command_line >= COMMAND_LINE_SIZE)
 382                         break;
 383                 *(to++) = c;
 384         }
 385         if (c == ' ' && to > command_line) to--;
 386         *to = '\0';
 387         *cmdline_p = command_line;
 388 }
 389
 390 static void __init
 391 setup_lowcore(void)
 392 {
 393         struct _lowcore *lc;
 394         int lc_pages;
 395
 396         /*
 397          * Setup lowcore for boot cpu
 398          */
 399         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 400         lc = (struct _lowcore *)
 401                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 402         memset(lc, 0, lc_pages * PAGE_SIZE);
 403         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 404         lc->restart_psw.addr =
 405                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 406         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 407         lc->external_new_psw.addr =
 408                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 409         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 410         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 411         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 412         lc->program_new_psw.addr =
 413                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 414         lc->mcck_new_psw.mask =
 415                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 416         lc->mcck_new_psw.addr =
 417                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 418         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 419         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 420         lc->ipl_device = S390_lowcore.ipl_device;
 421         lc->jiffy_timer = -1LL;
 422         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 423         lc->async_stack = (unsigned long)
 424                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 425         lc->panic_stack = (unsigned long)
 426                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 427         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 428         lc->thread_info = (unsigned long) &init_thread_union;
 429 #ifndef CONFIG_ARCH_S390X
 430         if (MACHINE_HAS_IEEE) {
 431                 lc->extended_save_area_addr = (__u32)
 432                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 433                 /* enable extended save area */
 434                 ctl_set_bit(14, 29);
 435         }
 436 #endif
 437         set_prefix((u32)(unsigned long) lc);
 438 }
 439
 440 static void __init
 441 setup_resources(void)
 442 {
 443         struct resource *res;
 444         int i;
 445
 446         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 447                 res = alloc_bootmem_low(sizeof(struct resource));
 448                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 449                 switch (memory_chunk[i].type) {
 450                 case CHUNK_READ_WRITE:
 451                         res->name = "System RAM";
 452                         break;
 453                 case CHUNK_READ_ONLY:
 454                         res->name = "System ROM";
 455                         res->flags |= IORESOURCE_READONLY;
 456                         break;
 457                 default:
 458                         res->name = "reserved";
 459                 }
 460                 res->start = memory_chunk[i].addr;
 461                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 462                 request_resource(&iomem_resource, res);
 463                 request_resource(res, &code_resource);
 464                 request_resource(res, &data_resource);
 465         }
 466 }
 467
 468 static void __init
 469 setup_memory(void)
 470 {
 471         unsigned long bootmap_size;
 472         unsigned long start_pfn, end_pfn, init_pfn;
 473         unsigned long last_rw_end;
 474         int i;
 475
 476         /*
 477          * partially used pages are not usable - thus
 478          * we are rounding upwards:
 479          */
 480         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 481         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 482
 483         /* Initialize storage key for kernel pages */
 484         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 485                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 486
 487         /*
 488          * Initialize the boot-time allocator (with low memory only):
 489          */
 490         bootmap_size = init_bootmem(start_pfn, end_pfn);
 491
 492         /*
 493          * Register RAM areas with the bootmem allocator.
 494          */
 495         last_rw_end = start_pfn;
 496
 497         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 498                 unsigned long start_chunk, end_chunk;
 499
 500                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 501                         continue;
 502                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 503                 start_chunk >>= PAGE_SHIFT;
 504                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 505                 end_chunk >>= PAGE_SHIFT;
 506                 if (start_chunk < start_pfn)
 507                         start_chunk = start_pfn;
 508                 if (end_chunk > end_pfn)
 509                         end_chunk = end_pfn;
 510                 if (start_chunk < end_chunk) {
 511                         /* Initialize storage key for RAM pages */
 512                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 513                              init_pfn++)
 514                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 515                                                      PAGE_DEFAULT_KEY);
 516                         free_bootmem(start_chunk << PAGE_SHIFT,
 517                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 518                         if (last_rw_end < start_chunk)
 519                                 add_memory_hole(last_rw_end, start_chunk - 1);
 520                         last_rw_end = end_chunk;
 521                 }
 522         }
 523
 524         psw_set_key(PAGE_DEFAULT_KEY);
 525
 526         if (last_rw_end < end_pfn - 1)
 527                 add_memory_hole(last_rw_end, end_pfn - 1);
 528
 529         /*
 530          * Reserve the bootmem bitmap itself as well. We do this in two
 531          * steps (first step was init_bootmem()) because this catches
 532          * the (very unlikely) case of us accidentally initializing the
 533          * bootmem allocator with an invalid RAM area.
 534          */
 535         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 536
 537 #ifdef CONFIG_BLK_DEV_INITRD
 538         if (INITRD_START) {
 539                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 540                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 541                         initrd_start = INITRD_START;
 542                         initrd_end = initrd_start + INITRD_SIZE;
 543                 } else {
 544                         printk("initrd extends beyond end of memory "
 545                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 546                                initrd_start + INITRD_SIZE, memory_end);
 547                         initrd_start = initrd_end = 0;
 548                 }
 549         }
 550 #endif
 551 }
 552
 553 /*
 554  * Setup function called from init/main.c just after the banner
 555  * was printed.
 556  */
 557
 558 void __init
 559 setup_arch(char **cmdline_p)
 560 {
 561         /*
 562          * print what head.S has found out about the machine
 563          */
 564 #ifndef CONFIG_ARCH_S390X
 565         printk((MACHINE_IS_VM) ?
 566                "We are running under VM (31 bit mode)\n" :
 567                "We are running native (31 bit mode)\n");
 568         printk((MACHINE_HAS_IEEE) ?
 569                "This machine has an IEEE fpu\n" :
 570                "This machine has no IEEE fpu\n");
 571 #else /* CONFIG_ARCH_S390X */
 572         printk((MACHINE_IS_VM) ?
 573                "We are running under VM (64 bit mode)\n" :
 574                "We are running native (64 bit mode)\n");
 575 #endif /* CONFIG_ARCH_S390X */
 576
 577         ROOT_DEV = Root_RAM0;
 578 #ifndef CONFIG_ARCH_S390X
 579         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 580         /*
 581          * We need some free virtual space to be able to do vmalloc.
 582          * On a machine with 2GB memory we make sure that we have at
 583          * least 128 MB free space for vmalloc.
 584          */
 585         if (memory_end > 1920*1024*1024)
 586                 memory_end = 1920*1024*1024;
 587 #else /* CONFIG_ARCH_S390X */
 588         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 589 #endif /* CONFIG_ARCH_S390X */
 590
 591         init_mm.start_code = PAGE_OFFSET;
 592         init_mm.end_code = (unsigned long) &_etext;
 593         init_mm.end_data = (unsigned long) &_edata;
 594         init_mm.brk = (unsigned long) &_end;
 595
 596         parse_cmdline_early(cmdline_p);
 597
 598         setup_memory();
 599         setup_resources();
 600         setup_lowcore();
 601
 602         cpu_init();
 603         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 604
 605         /*
 606          * Create kernel page tables and switch to virtual addressing.
 607          */
 608         paging_init();
 609
 610         /* Setup default console */
 611         conmode_default();
 612 }
 613
 614 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 615 {
 616    printk("cpu %d "
 617 #ifdef CONFIG_SMP
 618            "phys_idx=%d "
 619 #endif
 620            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 621            cpuinfo->cpu_nr,
 622 #ifdef CONFIG_SMP
 623            cpuinfo->cpu_addr,
 624 #endif
 625            cpuinfo->cpu_id.version,
 626            cpuinfo->cpu_id.ident,
 627            cpuinfo->cpu_id.machine,
 628            cpuinfo->cpu_id.unused);
 629 }
 630
 631 /*
 632  * show_cpuinfo - Get information on one CPU for use by procfs.
 633  */
 634
 635 static int show_cpuinfo(struct seq_file *m, void *v)
 636 {
 637         struct cpuinfo_S390 *cpuinfo;
 638         unsigned long n = (unsigned long) v - 1;
 639
 640         preempt_disable();
 641         if (!n) {
 642                 seq_printf(m, "vendor_id       : IBM/S390\n"
 643                                "# processors    : %i\n"
 644                                "bogomips per cpu: %lu.%02lu\n",
 645                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 646                                (loops_per_jiffy/(5000/HZ))%100);
 647         }
 648         if (cpu_online(n)) {
 649 #ifdef CONFIG_SMP
 650                 if (smp_processor_id() == n)
 651                         cpuinfo = &S390_lowcore.cpu_data;
 652                 else
 653                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 654 #else
 655                 cpuinfo = &S390_lowcore.cpu_data;
 656 #endif
 657                 seq_printf(m, "processor %li: "
 658                                "version = %02X,  "
 659                                "identification = %06X,  "
 660                                "machine = %04X\n",
 661                                n, cpuinfo->cpu_id.version,
 662                                cpuinfo->cpu_id.ident,
 663                                cpuinfo->cpu_id.machine);
 664         }
 665         preempt_enable();
 666         return 0;
 667 }
 668
 669 static void *c_start(struct seq_file *m, loff_t *pos)
 670 {
 671         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 672 }
 673 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 674 {
 675         ++*pos;
 676         return c_start(m, pos);
 677 }
 678 static void c_stop(struct seq_file *m, void *v)
 679 {
 680 }
 681 struct seq_operations cpuinfo_op = {
 682         .start  = c_start,
 683         .next   = c_next,
 684         .stop   = c_stop,
 685         .show   = show_cpuinfo,
 686 };
 687