kernel/linux/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 struct {
  57         unsigned long addr, size, type;
  58 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  59 #define CHUNK_READ_WRITE 0
  60 #define CHUNK_READ_ONLY 1
  61 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  62
  63 /*
  64  * Setup options
  65  */
  66 extern int _text,_etext, _edata, _end;
  67
  68 /*
  69  * This is set up by the setup-routine at boot-time
  70  * for S390 need to find out, what we have to setup
  71  * using address 0x10400 ...
  72  */
  73
  74 #include <asm/setup.h>
  75
  76 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  77
  78 static struct resource code_resource = { "Kernel code", 0x100000, 0 };
  79 static struct resource data_resource = { "Kernel data", 0, 0 };
  80
  81 /*
  82  * cpu_init() initializes state that is per-CPU.
  83  */
  84 void __devinit cpu_init (void)
  85 {
  86         int addr = hard_smp_processor_id();
  87
  88         /*
  89          * Store processor id in lowcore (used e.g. in timer_interrupt)
  90          */
  91         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
  92         S390_lowcore.cpu_data.cpu_addr = addr;
  93
  94         /*
  95          * Force FPU initialization:
  96          */
  97         clear_thread_flag(TIF_USEDFPU);
  98         current->used_math = 0;
  99
 100         /* Setup active_mm for idle_task  */
 101         atomic_inc(&init_mm.mm_count);
 102         current->active_mm = &init_mm;
 103         if (current->mm)
 104                 BUG();
 105         enter_lazy_tlb(&init_mm, current);
 106 }
 107
 108 /*
 109  * VM halt and poweroff setup routines
 110  */
 111 char vmhalt_cmd[128] = "";
 112 char vmpoff_cmd[128] = "";
 113
 114 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 115 {
 116         int sx, dx;
 117
 118         dx = 0;
 119         for (sx = 0; src[sx] != 0; sx++) {
 120                 if (src[sx] == '"') continue;
 121                 dst[dx++] = src[sx];
 122                 if (dx >= n) break;
 123         }
 124 }
 125
 126 static int __init vmhalt_setup(char *str)
 127 {
 128         strncpy_skip_quote(vmhalt_cmd, str, 127);
 129         vmhalt_cmd[127] = 0;
 130         return 1;
 131 }
 132
 133 __setup("vmhalt=", vmhalt_setup);
 134
 135 static int __init vmpoff_setup(char *str)
 136 {
 137         strncpy_skip_quote(vmpoff_cmd, str, 127);
 138         vmpoff_cmd[127] = 0;
 139         return 1;
 140 }
 141
 142 __setup("vmpoff=", vmpoff_setup);
 143
 144 /*
 145  * condev= and conmode= setup parameter.
 146  */
 147
 148 static int __init condev_setup(char *str)
 149 {
 150         int vdev;
 151
 152         vdev = simple_strtoul(str, &str, 0);
 153         if (vdev >= 0 && vdev < 65536) {
 154                 console_devno = vdev;
 155                 console_irq = -1;
 156         }
 157         return 1;
 158 }
 159
 160 __setup("condev=", condev_setup);
 161
 162 static int __init conmode_setup(char *str)
 163 {
 164 #if defined(CONFIG_SCLP_CONSOLE)
 165         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 166                 SET_CONSOLE_SCLP;
 167 #endif
 168 #if defined(CONFIG_TN3215_CONSOLE)
 169         if (strncmp(str, "3215", 5) == 0)
 170                 SET_CONSOLE_3215;
 171 #endif
 172 #if defined(CONFIG_TN3270_CONSOLE)
 173         if (strncmp(str, "3270", 5) == 0)
 174                 SET_CONSOLE_3270;
 175 #endif
 176         return 1;
 177 }
 178
 179 __setup("conmode=", conmode_setup);
 180
 181 static void __init conmode_default(void)
 182 {
 183         char query_buffer[1024];
 184         char *ptr;
 185
 186         if (MACHINE_IS_VM) {
 187                 cpcmd("QUERY CONSOLE", query_buffer, 1024);
 188                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 189                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 190                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 191                 cpcmd("QUERY TERM", query_buffer, 1024);
 192                 ptr = strstr(query_buffer, "CONMODE");
 193                 /*
 194                  * Set the conmode to 3215 so that the device recognition
 195                  * will set the cu_type of the console to 3215. If the
 196                  * conmode is 3270 and we don't set it back then both
 197                  * 3215 and the 3270 driver will try to access the console
 198                  * device (3215 as console and 3270 as normal tty).
 199                  */
 200                 cpcmd("TERM CONMODE 3215", NULL, 0);
 201                 if (ptr == NULL) {
 202 #if defined(CONFIG_SCLP_CONSOLE)
 203                         SET_CONSOLE_SCLP;
 204 #endif
 205                         return;
 206                 }
 207                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 208 #if defined(CONFIG_TN3270_CONSOLE)
 209                         SET_CONSOLE_3270;
 210 #elif defined(CONFIG_TN3215_CONSOLE)
 211                         SET_CONSOLE_3215;
 212 #elif defined(CONFIG_SCLP_CONSOLE)
 213                         SET_CONSOLE_SCLP;
 214 #endif
 215                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 216 #if defined(CONFIG_TN3215_CONSOLE)
 217                         SET_CONSOLE_3215;
 218 #elif defined(CONFIG_TN3270_CONSOLE)
 219                         SET_CONSOLE_3270;
 220 #elif defined(CONFIG_SCLP_CONSOLE)
 221                         SET_CONSOLE_SCLP;
 222 #endif
 223                 }
 224         } else if (MACHINE_IS_P390) {
 225 #if defined(CONFIG_TN3215_CONSOLE)
 226                 SET_CONSOLE_3215;
 227 #elif defined(CONFIG_TN3270_CONSOLE)
 228                 SET_CONSOLE_3270;
 229 #endif
 230         } else {
 231 #if defined(CONFIG_SCLP_CONSOLE)
 232                 SET_CONSOLE_SCLP;
 233 #endif
 234         }
 235 }
 236
 237 #ifdef CONFIG_SMP
 238 extern void machine_restart_smp(char *);
 239 extern void machine_halt_smp(void);
 240 extern void machine_power_off_smp(void);
 241
 242 void (*_machine_restart)(char *command) = machine_restart_smp;
 243 void (*_machine_halt)(void) = machine_halt_smp;
 244 void (*_machine_power_off)(void) = machine_power_off_smp;
 245 #else
 246 /*
 247  * Reboot, halt and power_off routines for non SMP.
 248  */
 249 extern void reipl(unsigned long devno);
 250 static void do_machine_restart_nonsmp(char * __unused)
 251 {
 252         if (MACHINE_IS_VM)
 253                 cpcmd ("IPL", NULL, 0);
 254         else
 255                 reipl (0x10000 | S390_lowcore.ipl_device);
 256 }
 257
 258 static void do_machine_halt_nonsmp(void)
 259 {
 260         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 261                 cpcmd(vmhalt_cmd, NULL, 0);
 262         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 263 }
 264
 265 static void do_machine_power_off_nonsmp(void)
 266 {
 267         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 268                 cpcmd(vmpoff_cmd, NULL, 0);
 269         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 270 }
 271
 272 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 273 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 274 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 275 #endif
 276
 277  /*
 278  * Reboot, halt and power_off stubs. They just call _machine_restart,
 279  * _machine_halt or _machine_power_off.
 280  */
 281
 282 void machine_restart(char *command)
 283 {
 284         console_unblank();
 285         _machine_restart(command);
 286 }
 287
 288 EXPORT_SYMBOL(machine_restart);
 289
 290 void machine_halt(void)
 291 {
 292         console_unblank();
 293         _machine_halt();
 294 }
 295
 296 EXPORT_SYMBOL(machine_halt);
 297
 298 void machine_power_off(void)
 299 {
 300         console_unblank();
 301         _machine_power_off();
 302 }
 303
 304 EXPORT_SYMBOL(machine_power_off);
 305
 306 /*
 307  * Setup function called from init/main.c just after the banner
 308  * was printed.
 309  */
 310 extern char _pstart, _pend, _stext;
 311
 312 void __init setup_arch(char **cmdline_p)
 313 {
 314         unsigned long bootmap_size;
 315         unsigned long memory_start, memory_end;
 316         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 317         struct resource *res;
 318         unsigned long start_pfn, end_pfn;
 319         static unsigned int smptrap=0;
 320         unsigned long delay = 0;
 321         struct _lowcore *lc;
 322         int i;
 323
 324         if (smptrap)
 325                 return;
 326         smptrap=1;
 327
 328         /*
 329          * print what head.S has found out about the machine
 330          */
 331 #ifndef CONFIG_ARCH_S390X
 332         printk((MACHINE_IS_VM) ?
 333                "We are running under VM (31 bit mode)\n" :
 334                "We are running native (31 bit mode)\n");
 335         printk((MACHINE_HAS_IEEE) ?
 336                "This machine has an IEEE fpu\n" :
 337                "This machine has no IEEE fpu\n");
 338 #else /* CONFIG_ARCH_S390X */
 339         printk((MACHINE_IS_VM) ?
 340                "We are running under VM (64 bit mode)\n" :
 341                "We are running native (64 bit mode)\n");
 342 #endif /* CONFIG_ARCH_S390X */
 343
 344         ROOT_DEV = Root_RAM0;
 345         memory_start = (unsigned long) &_end;    /* fixit if use $CODELO etc*/
 346 #ifndef CONFIG_ARCH_S390X
 347         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 348         /*
 349          * We need some free virtual space to be able to do vmalloc.
 350          * On a machine with 2GB memory we make sure that we have at
 351          * least 128 MB free space for vmalloc.
 352          */
 353         if (memory_end > 1920*1024*1024)
 354                 memory_end = 1920*1024*1024;
 355 #else /* CONFIG_ARCH_S390X */
 356         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 357 #endif /* CONFIG_ARCH_S390X */
 358         init_mm.start_code = PAGE_OFFSET;
 359         init_mm.end_code = (unsigned long) &_etext;
 360         init_mm.end_data = (unsigned long) &_edata;
 361         init_mm.brk = (unsigned long) &_end;
 362
 363         code_resource.start = (unsigned long) &_text;
 364         code_resource.end = (unsigned long) &_etext - 1;
 365         data_resource.start = (unsigned long) &_etext;
 366         data_resource.end = (unsigned long) &_edata - 1;
 367
 368         /* Save unparsed command line copy for /proc/cmdline */
 369         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 370         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 371
 372         for (;;) {
 373                 /*
 374                  * "mem=XXX[kKmM]" sets memsize
 375                  */
 376                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 377                         memory_end = simple_strtoul(from+4, &from, 0);
 378                         if ( *from == 'K' || *from == 'k' ) {
 379                                 memory_end = memory_end << 10;
 380                                 from++;
 381                         } else if ( *from == 'M' || *from == 'm' ) {
 382                                 memory_end = memory_end << 20;
 383                                 from++;
 384                         }
 385                 }
 386                 /*
 387                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 388                  */
 389                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 390                         delay = simple_strtoul(from+9, &from, 0);
 391                         if (*from == 's' || *from == 'S') {
 392                                 delay = delay*1000000;
 393                                 from++;
 394                         } else if (*from == 'm' || *from == 'M') {
 395                                 delay = delay*60*1000000;
 396                                 from++;
 397                         }
 398                         /* now wait for the requested amount of time */
 399                         udelay(delay);
 400                 }
 401                 cn = *(from++);
 402                 if (!cn)
 403                         break;
 404                 if (cn == '\n')
 405                         cn = ' ';  /* replace newlines with space */
 406                 if (cn == 0x0d)
 407                         cn = ' ';  /* replace 0x0d with space */
 408                 if (cn == ' ' && c == ' ')
 409                         continue;  /* remove additional spaces */
 410                 c = cn;
 411                 if (to - command_line >= COMMAND_LINE_SIZE)
 412                         break;
 413                 *(to++) = c;
 414         }
 415         if (c == ' ' && to > command_line) to--;
 416         *to = '\0';
 417         *cmdline_p = command_line;
 418
 419         /*
 420          * partially used pages are not usable - thus
 421          * we are rounding upwards:
 422          */
 423         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 424         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 425
 426         /*
 427          * Initialize the boot-time allocator (with low memory only):
 428          */
 429         bootmap_size = init_bootmem(start_pfn, end_pfn);
 430
 431         /*
 432          * Register RAM areas with the bootmem allocator.
 433          */
 434         for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
 435                 unsigned long start_chunk, end_chunk;
 436
 437                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 438                         continue;
 439                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 440                 start_chunk >>= PAGE_SHIFT;
 441                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 442                 end_chunk >>= PAGE_SHIFT;
 443                 if (start_chunk < start_pfn)
 444                         start_chunk = start_pfn;
 445                 if (end_chunk > end_pfn)
 446                         end_chunk = end_pfn;
 447                 if (start_chunk < end_chunk)
 448                         free_bootmem(start_chunk << PAGE_SHIFT,
 449                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 450         }
 451
 452         /*
 453          * Reserve the bootmem bitmap itself as well. We do this in two
 454          * steps (first step was init_bootmem()) because this catches
 455          * the (very unlikely) case of us accidentally initializing the
 456          * bootmem allocator with an invalid RAM area.
 457          */
 458         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 459
 460 #ifdef CONFIG_BLK_DEV_INITRD
 461         if (INITRD_START) {
 462                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 463                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 464                         initrd_start = INITRD_START;
 465                         initrd_end = initrd_start + INITRD_SIZE;
 466                 } else {
 467                         printk("initrd extends beyond end of memory "
 468                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 469                                initrd_start + INITRD_SIZE, memory_end);
 470                         initrd_start = initrd_end = 0;
 471                 }
 472         }
 473 #endif
 474
 475         /*
 476          * Setup lowcore for boot cpu
 477          */
 478 #ifndef CONFIG_ARCH_S390X
 479         lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 480         memset(lc, 0, PAGE_SIZE);
 481 #else /* CONFIG_ARCH_S390X */
 482         lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
 483         memset(lc, 0, 2*PAGE_SIZE);
 484 #endif /* CONFIG_ARCH_S390X */
 485         lc->restart_psw.mask = PSW_BASE_BITS;
 486         lc->restart_psw.addr =
 487                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 488         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 489         lc->external_new_psw.addr =
 490                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 491         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 492         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 493         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 494         lc->program_new_psw.addr =
 495                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 496         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 497         lc->mcck_new_psw.addr =
 498                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 499         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 500         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 501         lc->ipl_device = S390_lowcore.ipl_device;
 502         lc->jiffy_timer = -1LL;
 503         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 504         lc->async_stack = (unsigned long)
 505                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 506         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 507         lc->thread_info = (unsigned long) &init_thread_union;
 508 #ifdef CONFIG_ARCH_S390X
 509         if (MACHINE_HAS_DIAG44)
 510                 lc->diag44_opcode = 0x83000044;
 511         else
 512                 lc->diag44_opcode = 0x07000700;
 513 #endif /* CONFIG_ARCH_S390X */
 514         set_prefix((u32)(unsigned long) lc);
 515         cpu_init();
 516         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 517
 518         /*
 519          * Create kernel page tables and switch to virtual addressing.
 520          */
 521         paging_init();
 522
 523         res = alloc_bootmem_low(sizeof(struct resource));
 524         res->start = 0;
 525         res->end = memory_end;
 526         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 527         request_resource(&iomem_resource, res);
 528         request_resource(res, &code_resource);
 529         request_resource(res, &data_resource);
 530
 531         /* Setup default console */
 532         conmode_default();
 533 }
 534
 535 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 536 {
 537    printk("cpu %d "
 538 #ifdef CONFIG_SMP
 539            "phys_idx=%d "
 540 #endif
 541            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 542            cpuinfo->cpu_nr,
 543 #ifdef CONFIG_SMP
 544            cpuinfo->cpu_addr,
 545 #endif
 546            cpuinfo->cpu_id.version,
 547            cpuinfo->cpu_id.ident,
 548            cpuinfo->cpu_id.machine,
 549            cpuinfo->cpu_id.unused);
 550 }
 551
 552 /*
 553  * show_cpuinfo - Get information on one CPU for use by procfs.
 554  */
 555
 556 static int show_cpuinfo(struct seq_file *m, void *v)
 557 {
 558         struct cpuinfo_S390 *cpuinfo;
 559         unsigned long n = (unsigned long) v - 1;
 560
 561         if (!n) {
 562                 seq_printf(m, "vendor_id       : IBM/S390\n"
 563                                "# processors    : %i\n"
 564                                "bogomips per cpu: %lu.%02lu\n",
 565                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 566                                (loops_per_jiffy/(5000/HZ))%100);
 567         }
 568         if (cpu_online(n)) {
 569 #ifdef CONFIG_SMP
 570                 if (smp_processor_id() == n)
 571                         cpuinfo = &S390_lowcore.cpu_data;
 572                 else
 573                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 574 #else
 575                 cpuinfo = &S390_lowcore.cpu_data;
 576 #endif
 577                 seq_printf(m, "processor %li: "
 578                                "version = %02X,  "
 579                                "identification = %06X,  "
 580                                "machine = %04X\n",
 581                                n, cpuinfo->cpu_id.version,
 582                                cpuinfo->cpu_id.ident,
 583                                cpuinfo->cpu_id.machine);
 584         }
 585         return 0;
 586 }
 587
 588 static void *c_start(struct seq_file *m, loff_t *pos)
 589 {
 590         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 591 }
 592 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 593 {
 594         ++*pos;
 595         return c_start(m, pos);
 596 }
 597 static void c_stop(struct seq_file *m, void *v)
 598 {
 599 }
 600 struct seq_operations cpuinfo_op = {
 601         .start  = c_start,
 602         .next   = c_next,
 603         .stop   = c_stop,
 604         .show   = show_cpuinfo,
 605 };
 606
 607 /*
 608  * show_interrupts is needed by /proc/interrupts.
 609  */
 610
 611 static const char *intrclass_names[] = {
 612         "EXT",
 613         "I/O",
 614 };
 615
 616 int show_interrupts(struct seq_file *p, void *v)
 617 {
 618         int i = *(loff_t *) v, j;
 619
 620         if (i == 0) {
 621                 seq_puts(p, "           ");
 622                 for (j=0; j<NR_CPUS; j++)
 623                         if (cpu_online(j))
 624                                 seq_printf(p, "CPU%d       ",j);
 625                 seq_putc(p, '\n');
 626         }
 627
 628         if (i < NR_IRQS) {
 629                 seq_printf(p, "%s: ", intrclass_names[i]);
 630 #ifndef CONFIG_SMP
 631                 seq_printf(p, "%10u ", kstat_irqs(i));
 632 #else
 633                 for (j = 0; j < NR_CPUS; j++)
 634                         if (cpu_online(j))
 635                                 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 636 #endif
 637                 seq_putc(p, '\n');
 638
 639         }
 640
 641         return 0;
 642 }
 643
 644 /*
 645  * For compatibilty only. S/390 specific setup of interrupts et al. is done
 646  * much later in init_channel_subsystem().
 647  */
 648 void __init
 649 init_IRQ(void)
 650 {
 651         /* nothing... */
 652 }