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 #include <linux/autoconf.h>
  22
  23 #include <linux/types.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/slab.h>
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/sched.h>
  30 #include <linux/init.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/smp.h>
  33 #include <linux/kernel_stat.h>
  34 #include <linux/mm.h>
  35 #include <linux/delay.h>
  36
  37 #include <asm/system.h>
  38 #include <asm/atomic.h>
  39 #include <asm/bitops.h>
  40 #include <asm/current.h>
  41 #include <asm/delay.h>
  42 #include <asm/pgalloc.h>        /* for flush_tlb_all() proto/macro */
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>            /* for CPU_IRQ_REGION and friends */
  46 #include <asm/mmu_context.h>
  47 #include <asm/page.h>
  48 #include <asm/pgtable.h>
  49 #include <asm/pgalloc.h>
  50 #include <asm/processor.h>
  51 #include <asm/ptrace.h>
  52 #include <asm/unistd.h>
  53 #include <asm/cacheflush.h>
  54
  55 #define kDEBUG 0
  56
  57 spinlock_t pa_dbit_lock = SPIN_LOCK_UNLOCKED;
  58
  59 spinlock_t smp_lock = SPIN_LOCK_UNLOCKED;
  60
  61 volatile struct task_struct *smp_init_current_idle_task;
  62
  63 static volatile int cpu_now_booting = 0;        /* track which CPU is booting */
  64 static int parisc_max_cpus = -1;                /* Command line */
  65
  66 unsigned long cache_decay_ticks;        /* declared by include/linux/sched.h */
  67 cpumask_t cpu_online_map = CPU_MASK_NONE;       /* Bitmap of online CPUs */
  68 cpumask_t cpu_possible_map = CPU_MASK_NONE;     /* Bitmap of Present CPUs */
  69
  70 EXPORT_SYMBOL(cpu_online_map);
  71 EXPORT_SYMBOL(cpu_possible_map);
  72
  73
  74 struct smp_call_struct {
  75         void (*func) (void *info);
  76         void *info;
  77         long wait;
  78         atomic_t unstarted_count;
  79         atomic_t unfinished_count;
  80 };
  81 static volatile struct smp_call_struct *smp_call_function_data;
  82
  83 enum ipi_message_type {
  84         IPI_NOP=0,
  85         IPI_RESCHEDULE=1,
  86         IPI_CALL_FUNC,
  87         IPI_CPU_START,
  88         IPI_CPU_STOP,
  89         IPI_CPU_TEST
  90 };
  91
  92
  93 /********** SMP inter processor interrupt and communication routines */
  94
  95 #undef PER_CPU_IRQ_REGION
  96 #ifdef PER_CPU_IRQ_REGION
  97 /* XXX REVISIT Ignore for now.
  98 **    *May* need this "hook" to register IPI handler
  99 **    once we have perCPU ExtIntr switch tables.
 100 */
 101 static void
 102 ipi_init(int cpuid)
 103 {
 104
 105         /* If CPU is present ... */
 106 #ifdef ENTRY_SYS_CPUS
 107         /* *and* running (not stopped) ... */
 108 #error iCOD support wants state checked here.
 109 #endif
 110
 111 #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
 112
 113         if(cpu_online(cpuid) )
 114         {
 115                 switch_to_idle_task(current);
 116         }
 117
 118         return;
 119 }
 120 #endif
 121
 122
 123 /*
 124 ** Yoink this CPU from the runnable list...
 125 **
 126 */
 127 static void
 128 halt_processor(void)
 129 {
 130 #ifdef ENTRY_SYS_CPUS
 131 #error halt_processor() needs rework
 132 /*
 133 ** o migrate I/O interrupts off this CPU.
 134 ** o leave IPI enabled - __cli() will disable IPI.
 135 ** o leave CPU in online map - just change the state
 136 */
 137         cpu_data[this_cpu].state = STATE_STOPPED;
 138         mark_bh(IPI_BH);
 139 #else
 140         /* REVISIT : redirect I/O Interrupts to another CPU? */
 141         /* REVISIT : does PM *know* this CPU isn't available? */
 142         cpu_clear(smp_processor_id(), cpu_online_map);
 143         local_irq_disable();
 144         for (;;)
 145                 ;
 146 #endif
 147 }
 148
 149
 150 irqreturn_t
 151 ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 152 {
 153         int this_cpu = smp_processor_id();
 154         struct cpuinfo_parisc *p = &cpu_data[this_cpu];
 155         unsigned long ops;
 156         unsigned long flags;
 157
 158         /* Count this now; we may make a call that never returns. */
 159         p->ipi_count++;
 160
 161         mb();   /* Order interrupt and bit testing. */
 162
 163         for (;;) {
 164                 spin_lock_irqsave(&(p->lock),flags);
 165                 ops = p->pending_ipi;
 166                 p->pending_ipi = 0;
 167                 spin_unlock_irqrestore(&(p->lock),flags);
 168
 169                 mb(); /* Order bit clearing and data access. */
 170
 171                 if (!ops)
 172                     break;
 173
 174                 while (ops) {
 175                         unsigned long which = ffz(~ops);
 176
 177                         switch (which) {
 178                         case IPI_RESCHEDULE:
 179 #if (kDEBUG>=100)
 180                                 printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu);
 181 #endif /* kDEBUG */
 182                                 ops &= ~(1 << IPI_RESCHEDULE);
 183                                 /*
 184                                  * Reschedule callback.  Everything to be
 185                                  * done is done by the interrupt return path.
 186                                  */
 187                                 break;
 188
 189                         case IPI_CALL_FUNC:
 190 #if (kDEBUG>=100)
 191                                 printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu);
 192 #endif /* kDEBUG */
 193                                 ops &= ~(1 << IPI_CALL_FUNC);
 194                                 {
 195                                         volatile struct smp_call_struct *data;
 196                                         void (*func)(void *info);
 197                                         void *info;
 198                                         int wait;
 199
 200                                         data = smp_call_function_data;
 201                                         func = data->func;
 202                                         info = data->info;
 203                                         wait = data->wait;
 204
 205                                         mb();
 206                                         atomic_dec ((atomic_t *)&data->unstarted_count);
 207
 208                                         /* At this point, *data can't
 209                                          * be relied upon.
 210                                          */
 211
 212                                         (*func)(info);
 213
 214                                         /* Notify the sending CPU that the
 215                                          * task is done.
 216                                          */
 217                                         mb();
 218                                         if (wait)
 219                                                 atomic_dec ((atomic_t *)&data->unfinished_count);
 220                                 }
 221                                 break;
 222
 223                         case IPI_CPU_START:
 224 #if (kDEBUG>=100)
 225                                 printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu);
 226 #endif /* kDEBUG */
 227                                 ops &= ~(1 << IPI_CPU_START);
 228 #ifdef ENTRY_SYS_CPUS
 229                                 p->state = STATE_RUNNING;
 230 #endif
 231                                 break;
 232
 233                         case IPI_CPU_STOP:
 234 #if (kDEBUG>=100)
 235                                 printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu);
 236 #endif /* kDEBUG */
 237                                 ops &= ~(1 << IPI_CPU_STOP);
 238 #ifdef ENTRY_SYS_CPUS
 239 #else
 240                                 halt_processor();
 241 #endif
 242                                 break;
 243
 244                         case IPI_CPU_TEST:
 245 #if (kDEBUG>=100)
 246                                 printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu);
 247 #endif /* kDEBUG */
 248                                 ops &= ~(1 << IPI_CPU_TEST);
 249                                 break;
 250
 251                         default:
 252                                 printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
 253                                         this_cpu, which);
 254                                 ops &= ~(1 << which);
 255                                 return IRQ_NONE;
 256                         } /* Switch */
 257                 } /* while (ops) */
 258         }
 259         return IRQ_HANDLED;
 260 }
 261
 262
 263 static inline void
 264 ipi_send(int cpu, enum ipi_message_type op)
 265 {
 266         struct cpuinfo_parisc *p = &cpu_data[cpu];
 267         unsigned long flags;
 268
 269         spin_lock_irqsave(&(p->lock),flags);
 270         p->pending_ipi |= 1 << op;
 271         __raw_writel(IRQ_OFFSET(IPI_IRQ), cpu_data[cpu].hpa);
 272         spin_unlock_irqrestore(&(p->lock),flags);
 273 }
 274
 275
 276 static inline void
 277 send_IPI_single(int dest_cpu, enum ipi_message_type op)
 278 {
 279         if (dest_cpu == NO_PROC_ID) {
 280                 BUG();
 281                 return;
 282         }
 283
 284         ipi_send(dest_cpu, op);
 285 }
 286
 287 static inline void
 288 send_IPI_allbutself(enum ipi_message_type op)
 289 {
 290         int i;
 291
 292         for (i = 0; i < parisc_max_cpus; i++) {
 293                 if (cpu_online(i) && i != smp_processor_id())
 294                         send_IPI_single(i, op);
 295         }
 296 }
 297
 298
 299 inline void
 300 smp_send_stop(void)     { send_IPI_allbutself(IPI_CPU_STOP); }
 301
 302 static inline void
 303 smp_send_start(void)    { send_IPI_allbutself(IPI_CPU_START); }
 304
 305 void
 306 smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }
 307
 308
 309 /**
 310  * Run a function on all other CPUs.
 311  *  <func>      The function to run. This must be fast and non-blocking.
 312  *  <info>      An arbitrary pointer to pass to the function.
 313  *  <retry>     If true, keep retrying until ready.
 314  *  <wait>      If true, wait until function has completed on other CPUs.
 315  *  [RETURNS]   0 on success, else a negative status code.
 316  *
 317  * Does not return until remote CPUs are nearly ready to execute <func>
 318  * or have executed.
 319  */
 320
 321 int
 322 smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
 323 {
 324         struct smp_call_struct data;
 325         unsigned long timeout;
 326         static spinlock_t lock = SPIN_LOCK_UNLOCKED;
 327
 328         /* Can deadlock when called with interrupts disabled */
 329         WARN_ON(irqs_disabled());
 330
 331         data.func = func;
 332         data.info = info;
 333         data.wait = wait;
 334         atomic_set(&data.unstarted_count, num_online_cpus() - 1);
 335         atomic_set(&data.unfinished_count, num_online_cpus() - 1);
 336
 337         if (retry) {
 338                 spin_lock (&lock);
 339                 while (smp_call_function_data != 0)
 340                         barrier();
 341         }
 342         else {
 343                 spin_lock (&lock);
 344                 if (smp_call_function_data) {
 345                         spin_unlock (&lock);
 346                         return -EBUSY;
 347                 }
 348         }
 349
 350         smp_call_function_data = &data;
 351         spin_unlock (&lock);
 352
 353         /*  Send a message to all other CPUs and wait for them to respond  */
 354         send_IPI_allbutself(IPI_CALL_FUNC);
 355
 356         /*  Wait for response  */
 357         timeout = jiffies + HZ;
 358         while ( (atomic_read (&data.unstarted_count) > 0) &&
 359                 time_before (jiffies, timeout) )
 360                 barrier ();
 361
 362         /* We either got one or timed out. Release the lock */
 363
 364         mb();
 365         smp_call_function_data = NULL;
 366         if (atomic_read (&data.unstarted_count) > 0) {
 367                 printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d)\n",
 368                       smp_processor_id());
 369                 return -ETIMEDOUT;
 370         }
 371
 372         while (wait && atomic_read (&data.unfinished_count) > 0)
 373                         barrier ();
 374
 375         return 0;
 376 }
 377
 378 EXPORT_SYMBOL(smp_call_function);
 379
 380
 381
 382 /*
 383  *      Setup routine for controlling SMP activation
 384  *
 385  *      Command-line option of "nosmp" or "maxcpus=0" will disable SMP
 386  *      activation entirely (the MPS table probe still happens, though).
 387  *
 388  *      Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
 389  *      greater than 0, limits the maximum number of CPUs activated in
 390  *      SMP mode to <NUM>.
 391  */
 392
 393 static int __init nosmp(char *str)
 394 {
 395         parisc_max_cpus = 0;
 396         return 1;
 397 }
 398
 399 __setup("nosmp", nosmp);
 400
 401 static int __init maxcpus(char *str)
 402 {
 403         get_option(&str, &parisc_max_cpus);
 404         return 1;
 405 }
 406
 407 __setup("maxcpus=", maxcpus);
 408
 409 /*
 410  * Flush all other CPU's tlb and then mine.  Do this with on_each_cpu()
 411  * as we want to ensure all TLB's flushed before proceeding.
 412  */
 413
 414 extern void flush_tlb_all_local(void);
 415
 416 void
 417 smp_flush_tlb_all(void)
 418 {
 419         on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
 420 }
 421
 422
 423 void
 424 smp_do_timer(struct pt_regs *regs)
 425 {
 426         int cpu = smp_processor_id();
 427         struct cpuinfo_parisc *data = &cpu_data[cpu];
 428
 429         if (!--data->prof_counter) {
 430                 data->prof_counter = data->prof_multiplier;
 431                 update_process_times(user_mode(regs));
 432         }
 433 }
 434
 435 /*
 436  * Called by secondaries to update state and initialize CPU registers.
 437  */
 438 static void __init
 439 smp_cpu_init(int cpunum)
 440 {
 441         extern int init_per_cpu(int);  /* arch/parisc/kernel/setup.c */
 442         extern void init_IRQ(void);    /* arch/parisc/kernel/irq.c */
 443
 444         /* Set modes and Enable floating point coprocessor */
 445         (void) init_per_cpu(cpunum);
 446
 447         disable_sr_hashing();
 448
 449         mb();
 450
 451         /* Well, support 2.4 linux scheme as well. */
 452         if (cpu_test_and_set(cpunum, cpu_online_map))
 453         {
 454                 extern void machine_halt(void); /* arch/parisc.../process.c */
 455
 456                 printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
 457                 machine_halt();
 458         }
 459
 460         /* Initialise the idle task for this CPU */
 461         atomic_inc(&init_mm.mm_count);
 462         current->active_mm = &init_mm;
 463         if(current->mm)
 464                 BUG();
 465         enter_lazy_tlb(&init_mm, current);
 466
 467         init_IRQ();   /* make sure no IRQ's are enabled or pending */
 468 }
 469
 470
 471 /*
 472  * Slaves start using C here. Indirectly called from smp_slave_stext.
 473  * Do what start_kernel() and main() do for boot strap processor (aka monarch)
 474  */
 475 void __init smp_callin(void)
 476 {
 477         extern void cpu_idle(void);     /* arch/parisc/kernel/process.c */
 478         int slave_id = cpu_now_booting;
 479 #if 0
 480         void *istack;
 481 #endif
 482
 483         smp_cpu_init(slave_id);
 484
 485 #if 0   /* NOT WORKING YET - see entry.S */
 486         istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
 487         if (istack == NULL) {
 488             printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id);
 489             BUG();
 490         }
 491         mtctl(istack,31);
 492 #endif
 493
 494         flush_cache_all_local(); /* start with known state */
 495         flush_tlb_all_local();
 496
 497         local_irq_enable();  /* Interrupts have been off until now */
 498
 499         cpu_idle();      /* Wait for timer to schedule some work */
 500
 501         /* NOTREACHED */
 502         panic("smp_callin() AAAAaaaaahhhh....\n");
 503 }
 504
 505 #if 0
 506 /*
 507  * Create the idle task for a new Slave CPU.  DO NOT use kernel_thread()
 508  * because that could end up calling schedule(). If it did, the new idle
 509  * task could get scheduled before we had a chance to remove it from the
 510  * run-queue...
 511  */
 512 static struct task_struct *fork_by_hand(void)
 513 {
 514         struct pt_regs regs;
 515
 516         /*
 517          * don't care about the regs settings since
 518          * we'll never reschedule the forked task.
 519          */
 520         return copy_process(CLONE_VM|CLONE_IDLETASK, 0, &regs, 0, NULL, NULL);
 521 }
 522
 523
 524 /*
 525  * Bring one cpu online.
 526  */
 527 int __init smp_boot_one_cpu(int cpuid, int cpunum)
 528 {
 529         struct task_struct *idle;
 530         long timeout;
 531
 532         /*
 533          * Create an idle task for this CPU.  Note the address wed* give
 534          * to kernel_thread is irrelevant -- it's going to start
 535          * where OS_BOOT_RENDEVZ vector in SAL says to start.  But
 536          * this gets all the other task-y sort of data structures set
 537          * up like we wish.   We need to pull the just created idle task
 538          * off the run queue and stuff it into the init_tasks[] array.
 539          * Sheesh . . .
 540          */
 541
 542         idle = fork_by_hand();
 543         if (IS_ERR(idle))
 544                 panic("SMP: fork failed for CPU:%d", cpuid);
 545
 546         wake_up_forked_process(idle);
 547         init_idle(idle, cpunum);
 548         unhash_process(idle);
 549         idle->thread_info->cpu = cpunum;
 550
 551         /* Let _start know what logical CPU we're booting
 552         ** (offset into init_tasks[],cpu_data[])
 553         */
 554         cpu_now_booting = cpunum;
 555
 556         /*
 557         ** boot strap code needs to know the task address since
 558         ** it also contains the process stack.
 559         */
 560         smp_init_current_idle_task = idle ;
 561         mb();
 562
 563         /*
 564         ** This gets PDC to release the CPU from a very tight loop.
 565         ** See MEM_RENDEZ comments in head.S.
 566         */
 567         __raw_writel(IRQ_OFFSET(TIMER_IRQ), cpu_data[cpunum].hpa);
 568         mb();
 569
 570         /*
 571          * OK, wait a bit for that CPU to finish staggering about.
 572          * Slave will set a bit when it reaches smp_cpu_init().
 573          * Once the "monarch CPU" sees the bit change, it can move on.
 574          */
 575         for (timeout = 0; timeout < 10000; timeout++) {
 576                 if(cpu_online(cpunum)) {
 577                         /* Which implies Slave has started up */
 578                         cpu_now_booting = 0;
 579                         smp_init_current_idle_task = NULL;
 580                         goto alive ;
 581                 }
 582                 udelay(100);
 583                 barrier();
 584         }
 585
 586         put_task_struct(idle);
 587         idle = NULL;
 588
 589         printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
 590         return -1;
 591
 592 alive:
 593         /* Remember the Slave data */
 594 #if (kDEBUG>=100)
 595         printk(KERN_DEBUG "SMP: CPU:%d (num %d) came alive after %ld _us\n",
 596                 cpuid,  cpunum, timeout * 100);
 597 #endif /* kDEBUG */
 598 #ifdef ENTRY_SYS_CPUS
 599         cpu_data[cpunum].state = STATE_RUNNING;
 600 #endif
 601         return 0;
 602 }
 603 #endif
 604
 605
 606 void __devinit smp_prepare_boot_cpu(void)
 607 {
 608         int bootstrap_processor=cpu_data[0].cpuid;      /* CPU ID of BSP */
 609
 610 #ifdef ENTRY_SYS_CPUS
 611         cpu_data[0].state = STATE_RUNNING;
 612 #endif
 613
 614         /* Setup BSP mappings */
 615         printk(KERN_DEBUG "SMP: bootstrap CPU ID is %d\n",bootstrap_processor);
 616         init_task.thread_info->cpu = bootstrap_processor;
 617         current->thread_info->cpu = bootstrap_processor;
 618
 619         cpu_set(bootstrap_processor, cpu_online_map);
 620         cpu_set(bootstrap_processor, cpu_possible_map);
 621
 622         /* Mark Boostrap processor as present */
 623         current->active_mm = &init_mm;
 624
 625         cache_decay_ticks = HZ/100;     /* FIXME very rough.  */
 626 }
 627
 628
 629
 630 /*
 631 ** inventory.c:do_inventory() hasn't yet been run and thus we
 632 ** don't 'discover' the additional CPU's until later.
 633 */
 634 void __init smp_prepare_cpus(unsigned int max_cpus)
 635 {
 636
 637         if (max_cpus != -1)
 638                 printk(KERN_INFO "SMP: Limited to %d CPUs\n", max_cpus);
 639
 640         printk(KERN_INFO "SMP: Monarch CPU activated (%lu.%02lu BogoMIPS)\n",
 641                (cpu_data[0].loops_per_jiffy + 25) / 5000,
 642                ((cpu_data[0].loops_per_jiffy + 25) / 50) % 100);
 643
 644         return;
 645 }
 646
 647
 648 void smp_cpus_done(unsigned int cpu_max)
 649 {
 650         return;
 651 }
 652
 653
 654 int __devinit __cpu_up(unsigned int cpu)
 655 {
 656         return cpu_online(cpu) ? 0 : -ENOSYS;
 657 }
 658
 659
 660
 661 #ifdef ENTRY_SYS_CPUS
 662 /* Code goes along with:
 663 **    entry.s:        ENTRY_NAME(sys_cpus)   / * 215, for cpu stat * /
 664 */
 665 int sys_cpus(int argc, char **argv)
 666 {
 667         int i,j=0;
 668         extern int current_pid(int cpu);
 669
 670         if( argc > 2 ) {
 671                 printk("sys_cpus:Only one argument supported\n");
 672                 return (-1);
 673         }
 674         if ( argc == 1 ){
 675
 676 #ifdef DUMP_MORE_STATE
 677                 for(i=0; i<NR_CPUS; i++) {
 678                         int cpus_per_line = 4;
 679                         if(cpu_online(i)) {
 680                                 if (j++ % cpus_per_line)
 681                                         printk(" %3d",i);
 682                                 else
 683                                         printk("\n %3d",i);
 684                         }
 685                 }
 686                 printk("\n");
 687 #else
 688                 printk("\n 0\n");
 689 #endif
 690         } else if((argc==2) && !(strcmp(argv[1],"-l"))) {
 691                 printk("\nCPUSTATE  TASK CPUNUM CPUID HARDCPU(HPA)\n");
 692 #ifdef DUMP_MORE_STATE
 693                 for(i=0;i<NR_CPUS;i++) {
 694                         if (!cpu_online(i))
 695                                 continue;
 696                         if (cpu_data[i].cpuid != NO_PROC_ID) {
 697                                 switch(cpu_data[i].state) {
 698                                         case STATE_RENDEZVOUS:
 699                                                 printk("RENDEZVS ");
 700                                                 break;
 701                                         case STATE_RUNNING:
 702                                                 printk((current_pid(i)!=0) ? "RUNNING  " : "IDLING   ");
 703                                                 break;
 704                                         case STATE_STOPPED:
 705                                                 printk("STOPPED  ");
 706                                                 break;
 707                                         case STATE_HALTED:
 708                                                 printk("HALTED   ");
 709                                                 break;
 710                                         default:
 711                                                 printk("%08x?", cpu_data[i].state);
 712                                                 break;
 713                                 }
 714                                 if(cpu_online(i)) {
 715                                         printk(" %4d",current_pid(i));
 716                                 }
 717                                 printk(" %6d",cpu_number_map(i));
 718                                 printk(" %5d",i);
 719                                 printk(" 0x%lx\n",cpu_data[i].hpa);
 720                         }
 721                 }
 722 #else
 723                 printk("\n%s  %4d      0     0 --------",
 724                         (current->pid)?"RUNNING ": "IDLING  ",current->pid);
 725 #endif
 726         } else if ((argc==2) && !(strcmp(argv[1],"-s"))) {
 727 #ifdef DUMP_MORE_STATE
 728                 printk("\nCPUSTATE   CPUID\n");
 729                 for (i=0;i<NR_CPUS;i++) {
 730                         if (!cpu_online(i))
 731                                 continue;
 732                         if (cpu_data[i].cpuid != NO_PROC_ID) {
 733                                 switch(cpu_data[i].state) {
 734                                         case STATE_RENDEZVOUS:
 735                                                 printk("RENDEZVS");break;
 736                                         case STATE_RUNNING:
 737                                                 printk((current_pid(i)!=0) ? "RUNNING " : "IDLING");
 738                                                 break;
 739                                         case STATE_STOPPED:
 740                                                 printk("STOPPED ");break;
 741                                         case STATE_HALTED:
 742                                                 printk("HALTED  ");break;
 743                                         default:
 744                                 }
 745                                 printk("  %5d\n",i);
 746                         }
 747                 }
 748 #else
 749                 printk("\n%s    CPU0",(current->pid==0)?"RUNNING ":"IDLING  ");
 750 #endif
 751         } else {
 752                 printk("sys_cpus:Unknown request\n");
 753                 return (-1);
 754         }
 755         return 0;
 756 }
 757 #endif /* ENTRY_SYS_CPUS */
 758
 759 #ifdef CONFIG_PROC_FS
 760 int __init
 761 setup_profiling_timer(unsigned int multiplier)
 762 {
 763         return -EINVAL;
 764 }
 765 #endif