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
  48 /*
  49  * Machine setup..
  50  */
  51 unsigned int console_mode = 0;
  52 unsigned int console_devno = -1;
  53 unsigned int console_irq = -1;
  54 unsigned long memory_size = 0;
  55 unsigned long machine_flags = 0;
  56 unsigned int default_storage_key = 0;
  57 struct {
  58         unsigned long addr, size, type;
  59 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  60 #define CHUNK_READ_WRITE 0
  61 #define CHUNK_READ_ONLY 1
  62 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  63 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  64 static unsigned long __initdata memory_end;
  65
  66 /*
  67  * Setup options
  68  */
  69 extern int _text,_etext, _edata, _end;
  70
  71 /*
  72  * This is set up by the setup-routine at boot-time
  73  * for S390 need to find out, what we have to setup
  74  * using address 0x10400 ...
  75  */
  76
  77 #include <asm/setup.h>
  78
  79 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  80
  81 static struct resource code_resource = {
  82         .name  = "Kernel code",
  83         .start = (unsigned long) &_text,
  84         .end = (unsigned long) &_etext - 1,
  85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  86 };
  87
  88 static struct resource data_resource = {
  89         .name = "Kernel data",
  90         .start = (unsigned long) &_etext,
  91         .end = (unsigned long) &_edata - 1,
  92         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  93 };
  94
  95 /*
  96  * cpu_init() initializes state that is per-CPU.
  97  */
  98 void __devinit cpu_init (void)
  99 {
 100         int addr = hard_smp_processor_id();
 101
 102         /*
 103          * Store processor id in lowcore (used e.g. in timer_interrupt)
 104          */
 105         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 106         S390_lowcore.cpu_data.cpu_addr = addr;
 107
 108         /*
 109          * Force FPU initialization:
 110          */
 111         clear_thread_flag(TIF_USEDFPU);
 112         clear_used_math();
 113
 114         atomic_inc(&init_mm.mm_count);
 115         current->active_mm = &init_mm;
 116         if (current->mm)
 117                 BUG();
 118         enter_lazy_tlb(&init_mm, current);
 119 }
 120
 121 /*
 122  * VM halt and poweroff setup routines
 123  */
 124 char vmhalt_cmd[128] = "";
 125 char vmpoff_cmd[128] = "";
 126
 127 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 128 {
 129         int sx, dx;
 130
 131         dx = 0;
 132         for (sx = 0; src[sx] != 0; sx++) {
 133                 if (src[sx] == '"') continue;
 134                 dst[dx++] = src[sx];
 135                 if (dx >= n) break;
 136         }
 137 }
 138
 139 static int __init vmhalt_setup(char *str)
 140 {
 141         strncpy_skip_quote(vmhalt_cmd, str, 127);
 142         vmhalt_cmd[127] = 0;
 143         return 1;
 144 }
 145
 146 __setup("vmhalt=", vmhalt_setup);
 147
 148 static int __init vmpoff_setup(char *str)
 149 {
 150         strncpy_skip_quote(vmpoff_cmd, str, 127);
 151         vmpoff_cmd[127] = 0;
 152         return 1;
 153 }
 154
 155 __setup("vmpoff=", vmpoff_setup);
 156
 157 /*
 158  * condev= and conmode= setup parameter.
 159  */
 160
 161 static int __init condev_setup(char *str)
 162 {
 163         int vdev;
 164
 165         vdev = simple_strtoul(str, &str, 0);
 166         if (vdev >= 0 && vdev < 65536) {
 167                 console_devno = vdev;
 168                 console_irq = -1;
 169         }
 170         return 1;
 171 }
 172
 173 __setup("condev=", condev_setup);
 174
 175 static int __init conmode_setup(char *str)
 176 {
 177 #if defined(CONFIG_SCLP_CONSOLE)
 178         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 179                 SET_CONSOLE_SCLP;
 180 #endif
 181 #if defined(CONFIG_TN3215_CONSOLE)
 182         if (strncmp(str, "3215", 5) == 0)
 183                 SET_CONSOLE_3215;
 184 #endif
 185 #if defined(CONFIG_TN3270_CONSOLE)
 186         if (strncmp(str, "3270", 5) == 0)
 187                 SET_CONSOLE_3270;
 188 #endif
 189         return 1;
 190 }
 191
 192 __setup("conmode=", conmode_setup);
 193
 194 static void __init conmode_default(void)
 195 {
 196         char query_buffer[1024];
 197         char *ptr;
 198
 199         if (MACHINE_IS_VM) {
 200                 __cpcmd("QUERY CONSOLE", query_buffer, 1024);
 201                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 202                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 203                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 204                 __cpcmd("QUERY TERM", query_buffer, 1024);
 205                 ptr = strstr(query_buffer, "CONMODE");
 206                 /*
 207                  * Set the conmode to 3215 so that the device recognition
 208                  * will set the cu_type of the console to 3215. If the
 209                  * conmode is 3270 and we don't set it back then both
 210                  * 3215 and the 3270 driver will try to access the console
 211                  * device (3215 as console and 3270 as normal tty).
 212                  */
 213                 __cpcmd("TERM CONMODE 3215", NULL, 0);
 214                 if (ptr == NULL) {
 215 #if defined(CONFIG_SCLP_CONSOLE)
 216                         SET_CONSOLE_SCLP;
 217 #endif
 218                         return;
 219                 }
 220                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 221 #if defined(CONFIG_TN3270_CONSOLE)
 222                         SET_CONSOLE_3270;
 223 #elif defined(CONFIG_TN3215_CONSOLE)
 224                         SET_CONSOLE_3215;
 225 #elif defined(CONFIG_SCLP_CONSOLE)
 226                         SET_CONSOLE_SCLP;
 227 #endif
 228                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 229 #if defined(CONFIG_TN3215_CONSOLE)
 230                         SET_CONSOLE_3215;
 231 #elif defined(CONFIG_TN3270_CONSOLE)
 232                         SET_CONSOLE_3270;
 233 #elif defined(CONFIG_SCLP_CONSOLE)
 234                         SET_CONSOLE_SCLP;
 235 #endif
 236                 }
 237         } else if (MACHINE_IS_P390) {
 238 #if defined(CONFIG_TN3215_CONSOLE)
 239                 SET_CONSOLE_3215;
 240 #elif defined(CONFIG_TN3270_CONSOLE)
 241                 SET_CONSOLE_3270;
 242 #endif
 243         } else {
 244 #if defined(CONFIG_SCLP_CONSOLE)
 245                 SET_CONSOLE_SCLP;
 246 #endif
 247         }
 248 }
 249
 250 #ifdef CONFIG_SMP
 251 extern void machine_restart_smp(char *);
 252 extern void machine_halt_smp(void);
 253 extern void machine_power_off_smp(void);
 254
 255 void (*_machine_restart)(char *command) = machine_restart_smp;
 256 void (*_machine_halt)(void) = machine_halt_smp;
 257 void (*_machine_power_off)(void) = machine_power_off_smp;
 258 #else
 259 /*
 260  * Reboot, halt and power_off routines for non SMP.
 261  */
 262 extern void reipl(unsigned long devno);
 263 static void do_machine_restart_nonsmp(char * __unused)
 264 {
 265         if (MACHINE_IS_VM)
 266                 cpcmd ("IPL", NULL, 0);
 267         else
 268                 reipl (0x10000 | S390_lowcore.ipl_device);
 269 }
 270
 271 static void do_machine_halt_nonsmp(void)
 272 {
 273         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 274                 cpcmd(vmhalt_cmd, NULL, 0);
 275         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 276 }
 277
 278 static void do_machine_power_off_nonsmp(void)
 279 {
 280         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 281                 cpcmd(vmpoff_cmd, NULL, 0);
 282         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 283 }
 284
 285 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 286 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 287 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 288 #endif
 289
 290  /*
 291  * Reboot, halt and power_off stubs. They just call _machine_restart,
 292  * _machine_halt or _machine_power_off.
 293  */
 294
 295 void machine_restart(char *command)
 296 {
 297         console_unblank();
 298         _machine_restart(command);
 299 }
 300
 301 EXPORT_SYMBOL(machine_restart);
 302
 303 void machine_halt(void)
 304 {
 305         console_unblank();
 306         _machine_halt();
 307 }
 308
 309 EXPORT_SYMBOL(machine_halt);
 310
 311 void machine_power_off(void)
 312 {
 313         console_unblank();
 314         _machine_power_off();
 315 }
 316
 317 EXPORT_SYMBOL(machine_power_off);
 318
 319 static void __init
 320 add_memory_hole(unsigned long start, unsigned long end)
 321 {
 322         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 323
 324         if (end <= dma_pfn)
 325                 zholes_size[ZONE_DMA] += end - start + 1;
 326         else if (start > dma_pfn)
 327                 zholes_size[ZONE_NORMAL] += end - start + 1;
 328         else {
 329                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 330                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 331         }
 332 }
 333
 334 static void __init
 335 parse_cmdline_early(char **cmdline_p)
 336 {
 337         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 338         unsigned long delay = 0;
 339
 340         /* Save unparsed command line copy for /proc/cmdline */
 341         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 342         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 343
 344         for (;;) {
 345                 /*
 346                  * "mem=XXX[kKmM]" sets memsize
 347                  */
 348                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 349                         memory_end = simple_strtoul(from+4, &from, 0);
 350                         if ( *from == 'K' || *from == 'k' ) {
 351                                 memory_end = memory_end << 10;
 352                                 from++;
 353                         } else if ( *from == 'M' || *from == 'm' ) {
 354                                 memory_end = memory_end << 20;
 355                                 from++;
 356                         }
 357                 }
 358                 /*
 359                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 360                  */
 361                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 362                         delay = simple_strtoul(from+9, &from, 0);
 363                         if (*from == 's' || *from == 'S') {
 364                                 delay = delay*1000000;
 365                                 from++;
 366                         } else if (*from == 'm' || *from == 'M') {
 367                                 delay = delay*60*1000000;
 368                                 from++;
 369                         }
 370                         /* now wait for the requested amount of time */
 371                         udelay(delay);
 372                 }
 373                 cn = *(from++);
 374                 if (!cn)
 375                         break;
 376                 if (cn == '\n')
 377                         cn = ' ';  /* replace newlines with space */
 378                 if (cn == 0x0d)
 379                         cn = ' ';  /* replace 0x0d with space */
 380                 if (cn == ' ' && c == ' ')
 381                         continue;  /* remove additional spaces */
 382                 c = cn;
 383                 if (to - command_line >= COMMAND_LINE_SIZE)
 384                         break;
 385                 *(to++) = c;
 386         }
 387         if (c == ' ' && to > command_line) to--;
 388         *to = '\0';
 389         *cmdline_p = command_line;
 390 }
 391
 392 static void __init
 393 setup_lowcore(void)
 394 {
 395         struct _lowcore *lc;
 396         int lc_pages;
 397
 398         /*
 399          * Setup lowcore for boot cpu
 400          */
 401         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 402         lc = (struct _lowcore *)
 403                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 404         memset(lc, 0, lc_pages * PAGE_SIZE);
 405         lc->restart_psw.mask = PSW_BASE_BITS;
 406         lc->restart_psw.addr =
 407                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 408         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 409         lc->external_new_psw.addr =
 410                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 411         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 412         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 413         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 414         lc->program_new_psw.addr =
 415                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 416         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 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 #ifdef CONFIG_CHECK_STACK
 427         lc->panic_stack = (unsigned long)
 428                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 429 #endif
 430         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 431         lc->thread_info = (unsigned long) &init_thread_union;
 432 #ifdef CONFIG_ARCH_S390X
 433         if (MACHINE_HAS_DIAG44)
 434                 lc->diag44_opcode = 0x83000044;
 435         else
 436                 lc->diag44_opcode = 0x07000700;
 437 #endif /* CONFIG_ARCH_S390X */
 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;
 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         /*
 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 < 16 && 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                         free_bootmem(start_chunk << PAGE_SHIFT,
 509                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 510                         if (last_rw_end < start_chunk)
 511                                 add_memory_hole(last_rw_end, start_chunk - 1);
 512                         last_rw_end = end_chunk;
 513                 }
 514         }
 515
 516         if (last_rw_end < end_pfn - 1)
 517                 add_memory_hole(last_rw_end, end_pfn - 1);
 518
 519         /*
 520          * Reserve the bootmem bitmap itself as well. We do this in two
 521          * steps (first step was init_bootmem()) because this catches
 522          * the (very unlikely) case of us accidentally initializing the
 523          * bootmem allocator with an invalid RAM area.
 524          */
 525         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 526
 527 #ifdef CONFIG_BLK_DEV_INITRD
 528         if (INITRD_START) {
 529                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 530                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 531                         initrd_start = INITRD_START;
 532                         initrd_end = initrd_start + INITRD_SIZE;
 533                 } else {
 534                         printk("initrd extends beyond end of memory "
 535                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 536                                initrd_start + INITRD_SIZE, memory_end);
 537                         initrd_start = initrd_end = 0;
 538                 }
 539         }
 540 #endif
 541 }
 542
 543 /*
 544  * Setup function called from init/main.c just after the banner
 545  * was printed.
 546  */
 547
 548 void __init
 549 setup_arch(char **cmdline_p)
 550 {
 551         /*
 552          * print what head.S has found out about the machine
 553          */
 554 #ifndef CONFIG_ARCH_S390X
 555         printk((MACHINE_IS_VM) ?
 556                "We are running under VM (31 bit mode)\n" :
 557                "We are running native (31 bit mode)\n");
 558         printk((MACHINE_HAS_IEEE) ?
 559                "This machine has an IEEE fpu\n" :
 560                "This machine has no IEEE fpu\n");
 561 #else /* CONFIG_ARCH_S390X */
 562         printk((MACHINE_IS_VM) ?
 563                "We are running under VM (64 bit mode)\n" :
 564                "We are running native (64 bit mode)\n");
 565 #endif /* CONFIG_ARCH_S390X */
 566
 567         ROOT_DEV = Root_RAM0;
 568 #ifndef CONFIG_ARCH_S390X
 569         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 570         /*
 571          * We need some free virtual space to be able to do vmalloc.
 572          * On a machine with 2GB memory we make sure that we have at
 573          * least 128 MB free space for vmalloc.
 574          */
 575         if (memory_end > 1920*1024*1024)
 576                 memory_end = 1920*1024*1024;
 577 #else /* CONFIG_ARCH_S390X */
 578         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 579 #endif /* CONFIG_ARCH_S390X */
 580
 581         init_mm.start_code = PAGE_OFFSET;
 582         init_mm.end_code = (unsigned long) &_etext;
 583         init_mm.end_data = (unsigned long) &_edata;
 584         init_mm.brk = (unsigned long) &_end;
 585
 586         parse_cmdline_early(cmdline_p);
 587
 588         setup_memory();
 589         setup_resources();
 590         setup_lowcore();
 591
 592         cpu_init();
 593         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 594
 595         /*
 596          * Create kernel page tables and switch to virtual addressing.
 597          */
 598         paging_init();
 599
 600         /* Setup default console */
 601         conmode_default();
 602 }
 603
 604 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 605 {
 606    printk("cpu %d "
 607 #ifdef CONFIG_SMP
 608            "phys_idx=%d "
 609 #endif
 610            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 611            cpuinfo->cpu_nr,
 612 #ifdef CONFIG_SMP
 613            cpuinfo->cpu_addr,
 614 #endif
 615            cpuinfo->cpu_id.version,
 616            cpuinfo->cpu_id.ident,
 617            cpuinfo->cpu_id.machine,
 618            cpuinfo->cpu_id.unused);
 619 }
 620
 621 /*
 622  * show_cpuinfo - Get information on one CPU for use by procfs.
 623  */
 624
 625 static int show_cpuinfo(struct seq_file *m, void *v)
 626 {
 627         struct cpuinfo_S390 *cpuinfo;
 628         unsigned long n = (unsigned long) v - 1;
 629
 630         if (!n) {
 631                 seq_printf(m, "vendor_id       : IBM/S390\n"
 632                                "# processors    : %i\n"
 633                                "bogomips per cpu: %lu.%02lu\n",
 634                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 635                                (loops_per_jiffy/(5000/HZ))%100);
 636         }
 637         if (cpu_online(n)) {
 638 #ifdef CONFIG_SMP
 639                 if (smp_processor_id() == n)
 640                         cpuinfo = &S390_lowcore.cpu_data;
 641                 else
 642                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 643 #else
 644                 cpuinfo = &S390_lowcore.cpu_data;
 645 #endif
 646                 seq_printf(m, "processor %li: "
 647                                "version = %02X,  "
 648                                "identification = %06X,  "
 649                                "machine = %04X\n",
 650                                n, cpuinfo->cpu_id.version,
 651                                cpuinfo->cpu_id.ident,
 652                                cpuinfo->cpu_id.machine);
 653         }
 654         return 0;
 655 }
 656
 657 static void *c_start(struct seq_file *m, loff_t *pos)
 658 {
 659         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 660 }
 661 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 662 {
 663         ++*pos;
 664         return c_start(m, pos);
 665 }
 666 static void c_stop(struct seq_file *m, void *v)
 667 {
 668 }
 669 struct seq_operations cpuinfo_op = {
 670         .start  = c_start,
 671         .next   = c_next,
 672         .stop   = c_stop,
 673         .show   = show_cpuinfo,
 674 };
 675