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 static void do_machine_restart_nonsmp(char * __unused)
 265 {
 266         if (MACHINE_IS_VM)
 267                 cpcmd ("IPL", NULL, 0);
 268         else
 269                 reipl (0x10000 | S390_lowcore.ipl_device);
 270 }
 271
 272 static void do_machine_halt_nonsmp(void)
 273 {
 274         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 275                 cpcmd(vmhalt_cmd, NULL, 0);
 276         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 277 }
 278
 279 static void do_machine_power_off_nonsmp(void)
 280 {
 281         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 282                 cpcmd(vmpoff_cmd, NULL, 0);
 283         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 284 }
 285
 286 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 287 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 288 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 289 #endif
 290
 291  /*
 292  * Reboot, halt and power_off stubs. They just call _machine_restart,
 293  * _machine_halt or _machine_power_off.
 294  */
 295
 296 void machine_restart(char *command)
 297 {
 298         console_unblank();
 299         _machine_restart(command);
 300 }
 301
 302 void machine_halt(void)
 303 {
 304         console_unblank();
 305         _machine_halt();
 306 }
 307
 308 void machine_power_off(void)
 309 {
 310         console_unblank();
 311         _machine_power_off();
 312 }
 313
 314 static void __init
 315 add_memory_hole(unsigned long start, unsigned long end)
 316 {
 317         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 318
 319         if (end <= dma_pfn)
 320                 zholes_size[ZONE_DMA] += end - start + 1;
 321         else if (start > dma_pfn)
 322                 zholes_size[ZONE_NORMAL] += end - start + 1;
 323         else {
 324                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 325                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 326         }
 327 }
 328
 329 static void __init
 330 parse_cmdline_early(char **cmdline_p)
 331 {
 332         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 333         unsigned long delay = 0;
 334
 335         /* Save unparsed command line copy for /proc/cmdline */
 336         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 337         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 338
 339         for (;;) {
 340                 /*
 341                  * "mem=XXX[kKmM]" sets memsize
 342                  */
 343                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 344                         memory_end = simple_strtoul(from+4, &from, 0);
 345                         if ( *from == 'K' || *from == 'k' ) {
 346                                 memory_end = memory_end << 10;
 347                                 from++;
 348                         } else if ( *from == 'M' || *from == 'm' ) {
 349                                 memory_end = memory_end << 20;
 350                                 from++;
 351                         }
 352                 }
 353                 /*
 354                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 355                  */
 356                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 357                         delay = simple_strtoul(from+9, &from, 0);
 358                         if (*from == 's' || *from == 'S') {
 359                                 delay = delay*1000000;
 360                                 from++;
 361                         } else if (*from == 'm' || *from == 'M') {
 362                                 delay = delay*60*1000000;
 363                                 from++;
 364                         }
 365                         /* now wait for the requested amount of time */
 366                         udelay(delay);
 367                 }
 368                 cn = *(from++);
 369                 if (!cn)
 370                         break;
 371                 if (cn == '\n')
 372                         cn = ' ';  /* replace newlines with space */
 373                 if (cn == 0x0d)
 374                         cn = ' ';  /* replace 0x0d with space */
 375                 if (cn == ' ' && c == ' ')
 376                         continue;  /* remove additional spaces */
 377                 c = cn;
 378                 if (to - command_line >= COMMAND_LINE_SIZE)
 379                         break;
 380                 *(to++) = c;
 381         }
 382         if (c == ' ' && to > command_line) to--;
 383         *to = '\0';
 384         *cmdline_p = command_line;
 385 }
 386
 387 static void __init
 388 setup_lowcore(void)
 389 {
 390         struct _lowcore *lc;
 391         int lc_pages;
 392
 393         /*
 394          * Setup lowcore for boot cpu
 395          */
 396         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 397         lc = (struct _lowcore *)
 398                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 399         memset(lc, 0, lc_pages * PAGE_SIZE);
 400         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 401         lc->restart_psw.addr =
 402                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 403         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 404         lc->external_new_psw.addr =
 405                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 406         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 407         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 408         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 409         lc->program_new_psw.addr =
 410                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 411         lc->mcck_new_psw.mask =
 412                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 413         lc->mcck_new_psw.addr =
 414                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 415         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 416         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 417         lc->ipl_device = S390_lowcore.ipl_device;
 418         lc->jiffy_timer = -1LL;
 419         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 420         lc->async_stack = (unsigned long)
 421                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 422         lc->panic_stack = (unsigned long)
 423                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 424         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 425         lc->thread_info = (unsigned long) &init_thread_union;
 426 #ifndef CONFIG_ARCH_S390X
 427         if (MACHINE_HAS_IEEE) {
 428                 lc->extended_save_area_addr = (__u32)
 429                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 430                 /* enable extended save area */
 431                 ctl_set_bit(14, 29);
 432         }
 433 #endif
 434         set_prefix((u32)(unsigned long) lc);
 435 }
 436
 437 static void __init
 438 setup_resources(void)
 439 {
 440         struct resource *res;
 441         int i;
 442
 443         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 444                 res = alloc_bootmem_low(sizeof(struct resource));
 445                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 446                 switch (memory_chunk[i].type) {
 447                 case CHUNK_READ_WRITE:
 448                         res->name = "System RAM";
 449                         break;
 450                 case CHUNK_READ_ONLY:
 451                         res->name = "System ROM";
 452                         res->flags |= IORESOURCE_READONLY;
 453                         break;
 454                 default:
 455                         res->name = "reserved";
 456                 }
 457                 res->start = memory_chunk[i].addr;
 458                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 459                 request_resource(&iomem_resource, res);
 460                 request_resource(res, &code_resource);
 461                 request_resource(res, &data_resource);
 462         }
 463 }
 464
 465 static void __init
 466 setup_memory(void)
 467 {
 468         unsigned long bootmap_size;
 469         unsigned long start_pfn, end_pfn, init_pfn;
 470         unsigned long last_rw_end;
 471         int i;
 472
 473         /*
 474          * partially used pages are not usable - thus
 475          * we are rounding upwards:
 476          */
 477         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 478         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 479
 480         /* Initialize storage key for kernel pages */
 481         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 482                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 483
 484         /*
 485          * Initialize the boot-time allocator (with low memory only):
 486          */
 487         bootmap_size = init_bootmem(start_pfn, end_pfn);
 488
 489         /*
 490          * Register RAM areas with the bootmem allocator.
 491          */
 492         last_rw_end = start_pfn;
 493
 494         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 495                 unsigned long start_chunk, end_chunk;
 496
 497                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 498                         continue;
 499                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 500                 start_chunk >>= PAGE_SHIFT;
 501                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 502                 end_chunk >>= PAGE_SHIFT;
 503                 if (start_chunk < start_pfn)
 504                         start_chunk = start_pfn;
 505                 if (end_chunk > end_pfn)
 506                         end_chunk = end_pfn;
 507                 if (start_chunk < end_chunk) {
 508                         /* Initialize storage key for RAM pages */
 509                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 510                              init_pfn++)
 511                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 512                                                      PAGE_DEFAULT_KEY);
 513                         free_bootmem(start_chunk << PAGE_SHIFT,
 514                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 515                         if (last_rw_end < start_chunk)
 516                                 add_memory_hole(last_rw_end, start_chunk - 1);
 517                         last_rw_end = end_chunk;
 518                 }
 519         }
 520
 521         psw_set_key(PAGE_DEFAULT_KEY);
 522
 523         if (last_rw_end < end_pfn - 1)
 524                 add_memory_hole(last_rw_end, end_pfn - 1);
 525
 526         /*
 527          * Reserve the bootmem bitmap itself as well. We do this in two
 528          * steps (first step was init_bootmem()) because this catches
 529          * the (very unlikely) case of us accidentally initializing the
 530          * bootmem allocator with an invalid RAM area.
 531          */
 532         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 533
 534 #ifdef CONFIG_BLK_DEV_INITRD
 535         if (INITRD_START) {
 536                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 537                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 538                         initrd_start = INITRD_START;
 539                         initrd_end = initrd_start + INITRD_SIZE;
 540                 } else {
 541                         printk("initrd extends beyond end of memory "
 542                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 543                                initrd_start + INITRD_SIZE, memory_end);
 544                         initrd_start = initrd_end = 0;
 545                 }
 546         }
 547 #endif
 548 }
 549
 550 /*
 551  * Setup function called from init/main.c just after the banner
 552  * was printed.
 553  */
 554
 555 void __init
 556 setup_arch(char **cmdline_p)
 557 {
 558         /*
 559          * print what head.S has found out about the machine
 560          */
 561 #ifndef CONFIG_ARCH_S390X
 562         printk((MACHINE_IS_VM) ?
 563                "We are running under VM (31 bit mode)\n" :
 564                "We are running native (31 bit mode)\n");
 565         printk((MACHINE_HAS_IEEE) ?
 566                "This machine has an IEEE fpu\n" :
 567                "This machine has no IEEE fpu\n");
 568 #else /* CONFIG_ARCH_S390X */
 569         printk((MACHINE_IS_VM) ?
 570                "We are running under VM (64 bit mode)\n" :
 571                "We are running native (64 bit mode)\n");
 572 #endif /* CONFIG_ARCH_S390X */
 573
 574         ROOT_DEV = Root_RAM0;
 575 #ifndef CONFIG_ARCH_S390X
 576         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 577         /*
 578          * We need some free virtual space to be able to do vmalloc.
 579          * On a machine with 2GB memory we make sure that we have at
 580          * least 128 MB free space for vmalloc.
 581          */
 582         if (memory_end > 1920*1024*1024)
 583                 memory_end = 1920*1024*1024;
 584 #else /* CONFIG_ARCH_S390X */
 585         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 586 #endif /* CONFIG_ARCH_S390X */
 587
 588         init_mm.start_code = PAGE_OFFSET;
 589         init_mm.end_code = (unsigned long) &_etext;
 590         init_mm.end_data = (unsigned long) &_edata;
 591         init_mm.brk = (unsigned long) &_end;
 592
 593         parse_cmdline_early(cmdline_p);
 594
 595         setup_memory();
 596         setup_resources();
 597         setup_lowcore();
 598
 599         cpu_init();
 600         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 601
 602         /*
 603          * Create kernel page tables and switch to virtual addressing.
 604          */
 605         paging_init();
 606
 607         /* Setup default console */
 608         conmode_default();
 609 }
 610
 611 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 612 {
 613    printk("cpu %d "
 614 #ifdef CONFIG_SMP
 615            "phys_idx=%d "
 616 #endif
 617            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 618            cpuinfo->cpu_nr,
 619 #ifdef CONFIG_SMP
 620            cpuinfo->cpu_addr,
 621 #endif
 622            cpuinfo->cpu_id.version,
 623            cpuinfo->cpu_id.ident,
 624            cpuinfo->cpu_id.machine,
 625            cpuinfo->cpu_id.unused);
 626 }
 627
 628 /*
 629  * show_cpuinfo - Get information on one CPU for use by procfs.
 630  */
 631
 632 static int show_cpuinfo(struct seq_file *m, void *v)
 633 {
 634         struct cpuinfo_S390 *cpuinfo;
 635         unsigned long n = (unsigned long) v - 1;
 636
 637         if (!n) {
 638                 seq_printf(m, "vendor_id       : IBM/S390\n"
 639                                "# processors    : %i\n"
 640                                "bogomips per cpu: %lu.%02lu\n",
 641                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 642                                (loops_per_jiffy/(5000/HZ))%100);
 643         }
 644         if (cpu_online(n)) {
 645 #ifdef CONFIG_SMP
 646                 if (smp_processor_id() == n)
 647                         cpuinfo = &S390_lowcore.cpu_data;
 648                 else
 649                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 650 #else
 651                 cpuinfo = &S390_lowcore.cpu_data;
 652 #endif
 653                 seq_printf(m, "processor %li: "
 654                                "version = %02X,  "
 655                                "identification = %06X,  "
 656                                "machine = %04X\n",
 657                                n, cpuinfo->cpu_id.version,
 658                                cpuinfo->cpu_id.ident,
 659                                cpuinfo->cpu_id.machine);
 660         }
 661         return 0;
 662 }
 663
 664 static void *c_start(struct seq_file *m, loff_t *pos)
 665 {
 666         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 667 }
 668 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 669 {
 670         ++*pos;
 671         return c_start(m, pos);
 672 }
 673 static void c_stop(struct seq_file *m, void *v)
 674 {
 675 }
 676 struct seq_operations cpuinfo_op = {
 677         .start  = c_start,
 678         .next   = c_next,
 679         .stop   = c_stop,
 680         .show   = show_cpuinfo,
 681 };
 682