arch/parisc/kernel/smp.c

   1 /*
   2 ** SMP Support
   3 **
   4 ** Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   5 ** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
   6 ** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org>
   7 **
   8 ** Lots of stuff stolen from arch/alpha/kernel/smp.c
   9 ** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^)
  10 **
  11 ** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work.
  12 ** -grant (1/12/2001)
  13 **
  14 **      This program is free software; you can redistribute it and/or modify
  15 **      it under the terms of the GNU General Public License as published by
  16 **      the Free Software Foundation; either version 2 of the License, or
  17 **      (at your option) any later version.
  18 */
  19 #undef ENTRY_SYS_CPUS   /* syscall support for iCOD-like functionality */
  20
  21
  22 #include <linux/types.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/sched.h>
  29 #include <linux/init.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/smp.h>
  32 #include <linux/kernel_stat.h>
  33 #include <linux/mm.h>
  34 #include <linux/delay.h>
  35 #include <linux/bitops.h>
  36
  37 #include <asm/system.h>
  38 #include <asm/atomic.h>
  39 #include <asm/current.h>
  40 #include <asm/delay.h>
  41 #include <asm/tlbflush.h>
  42
  43 #include <asm/io.h>
  44 #include <asm/irq.h>            /* for CPU_IRQ_REGION and friends */
  45 #include <asm/mmu_context.h>
  46 #include <asm/page.h>
  47 #include <asm/pgtable.h>
  48 #include <asm/pgalloc.h>
  49 #include <asm/processor.h>
  50 #include <asm/ptrace.h>
  51 #include <asm/unistd.h>
  52 #include <asm/cacheflush.h>
  53
  54 #define kDEBUG 0
  55
  56 DEFINE_SPINLOCK(smp_lock);
  57
  58 volatile struct task_struct *smp_init_current_idle_task;
  59
  60 static volatile int cpu_now_booting __read_mostly = 0;  /* track which CPU is booting */
  61
  62 static int parisc_max_cpus __read_mostly = 1;
  63
  64 /* online cpus are ones that we've managed to bring up completely
  65  * possible cpus are all valid cpu
  66  * present cpus are all detected cpu
  67  *
  68  * On startup we bring up the "possible" cpus. Since we discover
  69  * CPUs later, we add them as hotplug, so the possible cpu mask is
  70  * empty in the beginning.
  71  */
  72
  73 cpumask_t cpu_online_map   __read_mostly = CPU_MASK_NONE;       /* Bitmap of online CPUs */
  74 cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;        /* Bitmap of Present CPUs */
  75
  76 EXPORT_SYMBOL(cpu_online_map);
  77 EXPORT_SYMBOL(cpu_possible_map);
  78
  79
  80 struct smp_call_struct {
  81         void (*func) (void *info);
  82         void *info;
  83         long wait;
  84         atomic_t unstarted_count;
  85         atomic_t unfinished_count;
  86 };
  87 static volatile struct smp_call_struct *smp_call_function_data;
  88
  89 enum ipi_message_type {
  90         IPI_NOP=0,
  91         IPI_RESCHEDULE=1,
  92         IPI_CALL_FUNC,
  93         IPI_CPU_START,
  94         IPI_CPU_STOP,
  95         IPI_CPU_TEST
  96 };
  97
  98
  99 /********** SMP inter processor interrupt and communication routines */
 100
 101 #undef PER_CPU_IRQ_REGION
 102 #ifdef PER_CPU_IRQ_REGION
 103 /* XXX REVISIT Ignore for now.
 104 **    *May* need this "hook" to register IPI handler
 105 **    once we have perCPU ExtIntr switch tables.
 106 */
 107 static void
 108 ipi_init(int cpuid)
 109 {
 110
 111         /* If CPU is present ... */
 112 #ifdef ENTRY_SYS_CPUS
 113         /* *and* running (not stopped) ... */
 114 #error iCOD support wants state checked here.
 115 #endif
 116
 117 #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
 118
 119         if(cpu_online(cpuid) )
 120         {
 121                 switch_to_idle_task(current);
 122         }
 123
 124         return;
 125 }
 126 #endif
 127
 128
 129 /*
 130 ** Yoink this CPU from the runnable list...
 131 **
 132 */
 133 static void
 134 halt_processor(void)
 135 {
 136 #ifdef ENTRY_SYS_CPUS
 137 #error halt_processor() needs rework
 138 /*
 139 ** o migrate I/O interrupts off this CPU.
 140 ** o leave IPI enabled - __cli() will disable IPI.
 141 ** o leave CPU in online map - just change the state
 142 */
 143         cpu_data[this_cpu].state = STATE_STOPPED;
 144         mark_bh(IPI_BH);
 145 #else
 146         /* REVISIT : redirect I/O Interrupts to another CPU? */
 147         /* REVISIT : does PM *know* this CPU isn't available? */
 148         cpu_clear(smp_processor_id(), cpu_online_map);
 149         local_irq_disable();
 150         for (;;)
 151                 ;
 152 #endif
 153 }
 154
 155
 156 irqreturn_t
 157 ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 158 {
 159         int this_cpu = smp_processor_id();
 160         struct cpuinfo_parisc *p = &cpu_data[this_cpu];
 161         unsigned long ops;
 162         unsigned long flags;
 163
 164         /* Count this now; we may make a call that never returns. */
 165         p->ipi_count++;
 166
 167         mb();   /* Order interrupt and bit testing. */
 168
 169         for (;;) {
 170                 spin_lock_irqsave(&(p->lock),flags);
 171                 ops = p->pending_ipi;
 172                 p->pending_ipi = 0;
 173                 spin_unlock_irqrestore(&(p->lock),flags);
 174
 175                 mb(); /* Order bit clearing and data access. */
 176
 177                 if (!ops)
 178                     break;
 179
 180                 while (ops) {
 181                         unsigned long which = ffz(~ops);
 182
 183                         ops &= ~(1 << which);
 184
 185                         switch (which) {
 186                         case IPI_NOP:
 187 #if (kDEBUG>=100)
 188                                 printk(KERN_DEBUG "CPU%d IPI_NOP\n",this_cpu);
 189 #endif /* kDEBUG */
 190                                 break;
 191
 192                         case IPI_RESCHEDULE:
 193 #if (kDEBUG>=100)
 194                                 printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu);
 195 #endif /* kDEBUG */
 196                                 /*
 197                                  * Reschedule callback.  Everything to be
 198                                  * done is done by the interrupt return path.
 199                                  */
 200                                 break;
 201
 202                         case IPI_CALL_FUNC:
 203 #if (kDEBUG>=100)
 204                                 printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu);
 205 #endif /* kDEBUG */
 206                                 {
 207                                         volatile struct smp_call_struct *data;
 208                                         void (*func)(void *info);
 209                                         void *info;
 210                                         int wait;
 211
 212                                         data = smp_call_function_data;
 213                                         func = data->func;
 214                                         info = data->info;
 215                                         wait = data->wait;
 216
 217                                         mb();
 218                                         atomic_dec ((atomic_t *)&data->unstarted_count);
 219
 220                                         /* At this point, *data can't
 221                                          * be relied upon.
 222                                          */
 223
 224                                         (*func)(info);
 225
 226                                         /* Notify the sending CPU that the
 227                                          * task is done.
 228                                          */
 229                                         mb();
 230                                         if (wait)
 231                                                 atomic_dec ((atomic_t *)&data->unfinished_count);
 232                                 }
 233                                 break;
 234
 235                         case IPI_CPU_START:
 236 #if (kDEBUG>=100)
 237                                 printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu);
 238 #endif /* kDEBUG */
 239 #ifdef ENTRY_SYS_CPUS
 240                                 p->state = STATE_RUNNING;
 241 #endif
 242                                 break;
 243
 244                         case IPI_CPU_STOP:
 245 #if (kDEBUG>=100)
 246                                 printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu);
 247 #endif /* kDEBUG */
 248 #ifdef ENTRY_SYS_CPUS
 249 #else
 250                                 halt_processor();
 251 #endif
 252                                 break;
 253
 254                         case IPI_CPU_TEST:
 255 #if (kDEBUG>=100)
 256                                 printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu);
 257 #endif /* kDEBUG */
 258                                 break;
 259
 260                         default:
 261                                 printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
 262                                         this_cpu, which);
 263                                 return IRQ_NONE;
 264                         } /* Switch */
 265                 } /* while (ops) */
 266         }
 267         return IRQ_HANDLED;
 268 }
 269
 270
 271 static inline void
 272 ipi_send(int cpu, enum ipi_message_type op)
 273 {
 274         struct cpuinfo_parisc *p = &cpu_data[cpu];
 275         unsigned long flags;
 276
 277         spin_lock_irqsave(&(p->lock),flags);
 278         p->pending_ipi |= 1 << op;
 279         gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa);
 280         spin_unlock_irqrestore(&(p->lock),flags);
 281 }
 282
 283
 284 static inline void
 285 send_IPI_single(int dest_cpu, enum ipi_message_type op)
 286 {
 287         if (dest_cpu == NO_PROC_ID) {
 288                 BUG();
 289                 return;
 290         }
 291
 292         ipi_send(dest_cpu, op);
 293 }
 294
 295 static inline void
 296 send_IPI_allbutself(enum ipi_message_type op)
 297 {
 298         int i;
 299
 300         for_each_online_cpu(i) {
 301                 if (i != smp_processor_id())
 302                         send_IPI_single(i, op);
 303         }
 304 }
 305
 306
 307 inline void
 308 smp_send_stop(void)     { send_IPI_allbutself(IPI_CPU_STOP); }
 309
 310 static inline void
 311 smp_send_start(void)    { send_IPI_allbutself(IPI_CPU_START); }
 312
 313 void
 314 smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }
 315
 316 void
 317 smp_send_all_nop(void)
 318 {
 319         send_IPI_allbutself(IPI_NOP);
 320 }
 321
 322
 323 /**
 324  * Run a function on all other CPUs.
 325  *  <func>      The function to run. This must be fast and non-blocking.
 326  *  <info>      An arbitrary pointer to pass to the function.
 327  *  <retry>     If true, keep retrying until ready.
 328  *  <wait>      If true, wait until function has completed on other CPUs.
 329  *  [RETURNS]   0 on success, else a negative status code.
 330  *
 331  * Does not return until remote CPUs are nearly ready to execute <func>
 332  * or have executed.
 333  */
 334
 335 int
 336 smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
 337 {
 338         struct smp_call_struct data;
 339         unsigned long timeout;
 340         static DEFINE_SPINLOCK(lock);
 341         int retries = 0;
 342
 343         if (num_online_cpus() < 2)
 344                 return 0;
 345
 346         /* Can deadlock when called with interrupts disabled */
 347         WARN_ON(irqs_disabled());
 348
 349         /* can also deadlock if IPIs are disabled */
 350         WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0);
 351
 352
 353         data.func = func;
 354         data.info = info;
 355         data.wait = wait;
 356         atomic_set(&data.unstarted_count, num_online_cpus() - 1);
 357         atomic_set(&data.unfinished_count, num_online_cpus() - 1);
 358
 359         if (retry) {
 360                 spin_lock (&lock);
 361                 while (smp_call_function_data != 0)
 362                         barrier();
 363         }
 364         else {
 365                 spin_lock (&lock);
 366                 if (smp_call_function_data) {
 367                         spin_unlock (&lock);
 368                         return -EBUSY;
 369                 }
 370         }
 371
 372         smp_call_function_data = &data;
 373         spin_unlock (&lock);
 374
 375         /*  Send a message to all other CPUs and wait for them to respond  */
 376         send_IPI_allbutself(IPI_CALL_FUNC);
 377
 378  retry:
 379         /*  Wait for response  */
 380         timeout = jiffies + HZ;
 381         while ( (atomic_read (&data.unstarted_count) > 0) &&
 382                 time_before (jiffies, timeout) )
 383                 barrier ();
 384
 385         if (atomic_read (&data.unstarted_count) > 0) {
 386                 printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n",
 387                       smp_processor_id(), ++retries);
 388                 goto retry;
 389         }
 390         /* We either got one or timed out. Release the lock */
 391
 392         mb();
 393         smp_call_function_data = NULL;
 394
 395         while (wait && atomic_read (&data.unfinished_count) > 0)
 396                         barrier ();
 397
 398         return 0;
 399 }
 400
 401 EXPORT_SYMBOL(smp_call_function);
 402
 403 /*
 404  * Flush all other CPU's tlb and then mine.  Do this with on_each_cpu()
 405  * as we want to ensure all TLB's flushed before proceeding.
 406  */
 407
 408 void
 409 smp_flush_tlb_all(void)
 410 {
 411         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
 412 }
 413
 414
 415 void
 416 smp_do_timer(struct pt_regs *regs)
 417 {
 418         int cpu = smp_processor_id();
 419         struct cpuinfo_parisc *data = &cpu_data[cpu];
 420
 421         if (!--data->prof_counter) {
 422                 data->prof_counter = data->prof_multiplier;
 423                 update_process_times(user_mode(regs));
 424         }
 425 }
 426
 427 /*
 428  * Called by secondaries to update state and initialize CPU registers.
 429  */
 430 static void __init
 431 smp_cpu_init(int cpunum)
 432 {
 433         extern int init_per_cpu(int);  /* arch/parisc/kernel/setup.c */
 434         extern void init_IRQ(void);    /* arch/parisc/kernel/irq.c */
 435
 436         /* Set modes and Enable floating point coprocessor */
 437         (void) init_per_cpu(cpunum);
 438
 439         disable_sr_hashing();
 440
 441         mb();
 442
 443         /* Well, support 2.4 linux scheme as well. */
 444         if (cpu_test_and_set(cpunum, cpu_online_map))
 445         {
 446                 extern void machine_halt(void); /* arch/parisc.../process.c */
 447
 448                 printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
 449                 machine_halt();
 450         }
 451
 452         /* Initialise the idle task for this CPU */
 453         atomic_inc(&init_mm.mm_count);
 454         current->active_mm = &init_mm;
 455         if(current->mm)
 456                 BUG();
 457         enter_lazy_tlb(&init_mm, current);
 458
 459         init_IRQ();   /* make sure no IRQ's are enabled or pending */
 460 }
 461
 462
 463 /*
 464  * Slaves start using C here. Indirectly called from smp_slave_stext.
 465  * Do what start_kernel() and main() do for boot strap processor (aka monarch)
 466  */
 467 void __init smp_callin(void)
 468 {
 469         int slave_id = cpu_now_booting;
 470 #if 0
 471         void *istack;
 472 #endif
 473
 474         smp_cpu_init(slave_id);
 475         preempt_disable();
 476
 477 #if 0   /* NOT WORKING YET - see entry.S */
 478         istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
 479         if (istack == NULL) {
 480             printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id);
 481             BUG();
 482         }
 483         mtctl(istack,31);
 484 #endif
 485
 486         flush_cache_all_local(); /* start with known state */
 487         flush_tlb_all_local(NULL);
 488
 489         local_irq_enable();  /* Interrupts have been off until now */
 490
 491         cpu_idle();      /* Wait for timer to schedule some work */
 492
 493         /* NOTREACHED */
 494         panic("smp_callin() AAAAaaaaahhhh....\n");
 495 }
 496
 497 /*
 498  * Bring one cpu online.
 499  */
 500 int __init smp_boot_one_cpu(int cpuid)
 501 {
 502         struct task_struct *idle;
 503         long timeout;
 504
 505         /*
 506          * Create an idle task for this CPU.  Note the address wed* give
 507          * to kernel_thread is irrelevant -- it's going to start
 508          * where OS_BOOT_RENDEVZ vector in SAL says to start.  But
 509          * this gets all the other task-y sort of data structures set
 510          * up like we wish.   We need to pull the just created idle task
 511          * off the run queue and stuff it into the init_tasks[] array.
 512          * Sheesh . . .
 513          */
 514
 515         idle = fork_idle(cpuid);
 516         if (IS_ERR(idle))
 517                 panic("SMP: fork failed for CPU:%d", cpuid);
 518
 519         task_thread_info(idle)->cpu = cpuid;
 520
 521         /* Let _start know what logical CPU we're booting
 522         ** (offset into init_tasks[],cpu_data[])
 523         */
 524         cpu_now_booting = cpuid;
 525
 526         /*
 527         ** boot strap code needs to know the task address since
 528         ** it also contains the process stack.
 529         */
 530         smp_init_current_idle_task = idle ;
 531         mb();
 532
 533         printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa);
 534
 535         /*
 536         ** This gets PDC to release the CPU from a very tight loop.
 537         **
 538         ** From the PA-RISC 2.0 Firmware Architecture Reference Specification:
 539         ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which
 540         ** is executed after receiving the rendezvous signal (an interrupt to
 541         ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the
 542         ** contents of memory are valid."
 543         */
 544         gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa);
 545         mb();
 546
 547         /*
 548          * OK, wait a bit for that CPU to finish staggering about.
 549          * Slave will set a bit when it reaches smp_cpu_init().
 550          * Once the "monarch CPU" sees the bit change, it can move on.
 551          */
 552         for (timeout = 0; timeout < 10000; timeout++) {
 553                 if(cpu_online(cpuid)) {
 554                         /* Which implies Slave has started up */
 555                         cpu_now_booting = 0;
 556                         smp_init_current_idle_task = NULL;
 557                         goto alive ;
 558                 }
 559                 udelay(100);
 560                 barrier();
 561         }
 562
 563         put_task_struct(idle);
 564         idle = NULL;
 565
 566         printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
 567         return -1;
 568
 569 alive:
 570         /* Remember the Slave data */
 571 #if (kDEBUG>=100)
 572         printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
 573                 cpuid, timeout * 100);
 574 #endif /* kDEBUG */
 575 #ifdef ENTRY_SYS_CPUS
 576         cpu_data[cpuid].state = STATE_RUNNING;
 577 #endif
 578         return 0;
 579 }
 580
 581 void __devinit smp_prepare_boot_cpu(void)
 582 {
 583         int bootstrap_processor=cpu_data[0].cpuid;      /* CPU ID of BSP */
 584
 585 #ifdef ENTRY_SYS_CPUS
 586         cpu_data[0].state = STATE_RUNNING;
 587 #endif
 588
 589         /* Setup BSP mappings */
 590         printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor);
 591
 592         cpu_set(bootstrap_processor, cpu_online_map);
 593         cpu_set(bootstrap_processor, cpu_present_map);
 594 }
 595
 596
 597
 598 /*
 599 ** inventory.c:do_inventory() hasn't yet been run and thus we
 600 ** don't 'discover' the additional CPU's until later.
 601 */
 602 void __init smp_prepare_cpus(unsigned int max_cpus)
 603 {
 604         cpus_clear(cpu_present_map);
 605         cpu_set(0, cpu_present_map);
 606
 607         parisc_max_cpus = max_cpus;
 608         if (!max_cpus)
 609                 printk(KERN_INFO "SMP mode deactivated.\n");
 610 }
 611
 612
 613 void smp_cpus_done(unsigned int cpu_max)
 614 {
 615         return;
 616 }
 617
 618
 619 int __devinit __cpu_up(unsigned int cpu)
 620 {
 621         if (cpu != 0 && cpu < parisc_max_cpus)
 622                 smp_boot_one_cpu(cpu);
 623
 624         return cpu_online(cpu) ? 0 : -ENOSYS;
 625 }
 626
 627
 628
 629 #ifdef ENTRY_SYS_CPUS
 630 /* Code goes along with:
 631 **    entry.s:        ENTRY_NAME(sys_cpus)   / * 215, for cpu stat * /
 632 */
 633 int sys_cpus(int argc, char **argv)
 634 {
 635         int i,j=0;
 636         extern int current_pid(int cpu);
 637
 638         if( argc > 2 ) {
 639                 printk("sys_cpus:Only one argument supported\n");
 640                 return (-1);
 641         }
 642         if ( argc == 1 ){
 643
 644 #ifdef DUMP_MORE_STATE
 645                 for_each_online_cpu(i) {
 646                         int cpus_per_line = 4;
 647
 648                         if (j++ % cpus_per_line)
 649                                 printk(" %3d",i);
 650                         else
 651                                 printk("\n %3d",i);
 652                 }
 653                 printk("\n");
 654 #else
 655                 printk("\n 0\n");
 656 #endif
 657         } else if((argc==2) && !(strcmp(argv[1],"-l"))) {
 658                 printk("\nCPUSTATE  TASK CPUNUM CPUID HARDCPU(HPA)\n");
 659 #ifdef DUMP_MORE_STATE
 660                 for_each_online_cpu(i) {
 661                         if (cpu_data[i].cpuid != NO_PROC_ID) {
 662                                 switch(cpu_data[i].state) {
 663                                         case STATE_RENDEZVOUS:
 664                                                 printk("RENDEZVS ");
 665                                                 break;
 666                                         case STATE_RUNNING:
 667                                                 printk((current_pid(i)!=0) ? "RUNNING  " : "IDLING   ");
 668                                                 break;
 669                                         case STATE_STOPPED:
 670                                                 printk("STOPPED  ");
 671                                                 break;
 672                                         case STATE_HALTED:
 673                                                 printk("HALTED   ");
 674                                                 break;
 675                                         default:
 676                                                 printk("%08x?", cpu_data[i].state);
 677                                                 break;
 678                                 }
 679                                 if(cpu_online(i)) {
 680                                         printk(" %4d",current_pid(i));
 681                                 }
 682                                 printk(" %6d",cpu_number_map(i));
 683                                 printk(" %5d",i);
 684                                 printk(" 0x%lx\n",cpu_data[i].hpa);
 685                         }
 686                 }
 687 #else
 688                 printk("\n%s  %4d      0     0 --------",
 689                         (current->pid)?"RUNNING ": "IDLING  ",current->pid);
 690 #endif
 691         } else if ((argc==2) && !(strcmp(argv[1],"-s"))) {
 692 #ifdef DUMP_MORE_STATE
 693                 printk("\nCPUSTATE   CPUID\n");
 694                 for_each_online_cpu(i) {
 695                         if (cpu_data[i].cpuid != NO_PROC_ID) {
 696                                 switch(cpu_data[i].state) {
 697                                         case STATE_RENDEZVOUS:
 698                                                 printk("RENDEZVS");break;
 699                                         case STATE_RUNNING:
 700                                                 printk((current_pid(i)!=0) ? "RUNNING " : "IDLING");
 701                                                 break;
 702                                         case STATE_STOPPED:
 703                                                 printk("STOPPED ");break;
 704                                         case STATE_HALTED:
 705                                                 printk("HALTED  ");break;
 706                                         default:
 707                                 }
 708                                 printk("  %5d\n",i);
 709                         }
 710                 }
 711 #else
 712                 printk("\n%s    CPU0",(current->pid==0)?"RUNNING ":"IDLING  ");
 713 #endif
 714         } else {
 715                 printk("sys_cpus:Unknown request\n");
 716                 return (-1);
 717         }
 718         return 0;
 719 }
 720 #endif /* ENTRY_SYS_CPUS */
 721
 722 #ifdef CONFIG_PROC_FS
 723 int __init
 724 setup_profiling_timer(unsigned int multiplier)
 725 {
 726         return -EINVAL;
 727 }
 728 #endif