arch/m32r/kernel/smpboot.c

   1 /*
   2  *  linux/arch/m32r/kernel/smpboot.c
   3  *    orig : i386 2.4.10
   4  *
   5  *  M32R SMP booting functions
   6  *
   7  *  Copyright (c) 2001, 2002, 2003  Hitoshi Yamamoto
   8  *
   9  *  Taken from i386 version.
  10  *        (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
  11  *        (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
  12  *
  13  *      Much of the core SMP work is based on previous work by Thomas Radke, to
  14  *      whom a great many thanks are extended.
  15  *
  16  *      Thanks to Intel for making available several different Pentium,
  17  *      Pentium Pro and Pentium-II/Xeon MP machines.
  18  *      Original development of Linux SMP code supported by Caldera.
  19  *
  20  *      This code is released under the GNU General Public License version 2 or
  21  *      later.
  22  *
  23  *      Fixes
  24  *              Felix Koop      :       NR_CPUS used properly
  25  *              Jose Renau      :       Handle single CPU case.
  26  *              Alan Cox        :       By repeated request
  27  *                                      8) - Total BogoMIP report.
  28  *              Greg Wright     :       Fix for kernel stacks panic.
  29  *              Erich Boleyn    :       MP v1.4 and additional changes.
  30  *      Matthias Sattler        :       Changes for 2.1 kernel map.
  31  *      Michel Lespinasse       :       Changes for 2.1 kernel map.
  32  *      Michael Chastain        :       Change trampoline.S to gnu as.
  33  *              Alan Cox        :       Dumb bug: 'B' step PPro's are fine
  34  *              Ingo Molnar     :       Added APIC timers, based on code
  35  *                                      from Jose Renau
  36  *              Ingo Molnar     :       various cleanups and rewrites
  37  *              Tigran Aivazian :       fixed "0.00 in /proc/uptime on SMP" bug.
  38  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs
  39  *              Martin J. Bligh :       Added support for multi-quad systems
  40  */
  41
  42 #include <linux/module.h>
  43 #include <linux/cpu.h>
  44 #include <linux/init.h>
  45 #include <linux/kernel.h>
  46 #include <linux/mm.h>
  47 #include <linux/sched.h>
  48 #include <linux/err.h>
  49 #include <linux/irq.h>
  50 #include <linux/bootmem.h>
  51 #include <linux/delay.h>
  52
  53 #include <asm/io.h>
  54 #include <asm/pgalloc.h>
  55 #include <asm/tlbflush.h>
  56
  57 #define DEBUG_SMP
  58 #ifdef DEBUG_SMP
  59 #define Dprintk(x...) printk(x)
  60 #else
  61 #define Dprintk(x...)
  62 #endif
  63
  64 extern cpumask_t cpu_initialized;
  65
  66 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  67 /* Data structures and variables                                             */
  68 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  69
  70 /* Processor that is doing the boot up */
  71 static unsigned int bsp_phys_id = -1;
  72
  73 /* Bitmask of physically existing CPUs */
  74 physid_mask_t phys_cpu_present_map;
  75
  76 /* Bitmask of currently online CPUs */
  77 cpumask_t cpu_online_map;
  78 EXPORT_SYMBOL(cpu_online_map);
  79
  80 cpumask_t cpu_bootout_map;
  81 cpumask_t cpu_bootin_map;
  82 static cpumask_t cpu_callin_map;
  83 cpumask_t cpu_callout_map;
  84 EXPORT_SYMBOL(cpu_callout_map);
  85 cpumask_t cpu_possible_map = CPU_MASK_ALL;
  86 EXPORT_SYMBOL(cpu_possible_map);
  87
  88 /* Per CPU bogomips and other parameters */
  89 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
  90
  91 static int cpucount;
  92 static cpumask_t smp_commenced_mask;
  93
  94 extern struct {
  95         void * spi;
  96         unsigned short ss;
  97 } stack_start;
  98
  99 /* which physical physical ID maps to which logical CPU number */
 100 static volatile int physid_2_cpu[NR_CPUS];
 101 #define physid_to_cpu(physid)   physid_2_cpu[physid]
 102
 103 /* which logical CPU number maps to which physical ID */
 104 volatile int cpu_2_physid[NR_CPUS];
 105
 106 DEFINE_PER_CPU(int, prof_multiplier) = 1;
 107 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
 108 DEFINE_PER_CPU(int, prof_counter) = 1;
 109
 110 spinlock_t ipi_lock[NR_IPIS];
 111
 112 static unsigned int calibration_result;
 113
 114 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 115 /* Function Prototypes                                                       */
 116 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 117
 118 void smp_prepare_boot_cpu(void);
 119 void smp_prepare_cpus(unsigned int);
 120 static void init_ipi_lock(void);
 121 static void do_boot_cpu(int);
 122 int __cpu_up(unsigned int);
 123 void smp_cpus_done(unsigned int);
 124
 125 int start_secondary(void *);
 126 static void smp_callin(void);
 127 static void smp_online(void);
 128
 129 static void show_mp_info(int);
 130 static void smp_store_cpu_info(int);
 131 static void show_cpu_info(int);
 132 int setup_profiling_timer(unsigned int);
 133 static void init_cpu_to_physid(void);
 134 static void map_cpu_to_physid(int, int);
 135 static void unmap_cpu_to_physid(int, int);
 136
 137 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 138 /* Boot up APs Routines : BSP                                                */
 139 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 140 void __devinit smp_prepare_boot_cpu(void)
 141 {
 142         bsp_phys_id = hard_smp_processor_id();
 143         physid_set(bsp_phys_id, phys_cpu_present_map);
 144         cpu_set(0, cpu_online_map);     /* BSP's cpu_id == 0 */
 145         cpu_set(0, cpu_callout_map);
 146         cpu_set(0, cpu_callin_map);
 147
 148         /*
 149          * Initialize the logical to physical CPU number mapping
 150          */
 151         init_cpu_to_physid();
 152         map_cpu_to_physid(0, bsp_phys_id);
 153         current_thread_info()->cpu = 0;
 154 }
 155
 156 /*==========================================================================*
 157  * Name:         smp_prepare_cpus (old smp_boot_cpus)
 158  *
 159  * Description:  This routine boot up APs.
 160  *
 161  * Born on Date: 2002.02.05
 162  *
 163  * Arguments:    NONE
 164  *
 165  * Returns:      void (cannot fail)
 166  *
 167  * Modification log:
 168  * Date       Who Description
 169  * ---------- --- --------------------------------------------------------
 170  * 2003-06-24 hy  modify for linux-2.5.69
 171  *
 172  *==========================================================================*/
 173 void __init smp_prepare_cpus(unsigned int max_cpus)
 174 {
 175         int phys_id;
 176         unsigned long nr_cpu;
 177
 178         nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
 179         if (nr_cpu > NR_CPUS) {
 180                 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
 181                         nr_cpu, NR_CPUS);
 182                 goto smp_done;
 183         }
 184         for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
 185                 physid_set(phys_id, phys_cpu_present_map);
 186 #ifndef CONFIG_HOTPLUG_CPU
 187         cpu_present_map = cpu_possible_map;
 188 #endif
 189
 190         show_mp_info(nr_cpu);
 191
 192         init_ipi_lock();
 193
 194         /*
 195          * Setup boot CPU information
 196          */
 197         smp_store_cpu_info(0); /* Final full version of the data */
 198
 199         /*
 200          * If SMP should be disabled, then really disable it!
 201          */
 202         if (!max_cpus) {
 203                 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
 204                 goto smp_done;
 205         }
 206
 207         /*
 208          * Now scan the CPU present map and fire up the other CPUs.
 209          */
 210         Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
 211
 212         for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
 213                 /*
 214                  * Don't even attempt to start the boot CPU!
 215                  */
 216                 if (phys_id == bsp_phys_id)
 217                         continue;
 218
 219                 if (!physid_isset(phys_id, phys_cpu_present_map))
 220                         continue;
 221
 222                 if ((max_cpus >= 0) && (max_cpus <= cpucount + 1))
 223                         continue;
 224
 225                 do_boot_cpu(phys_id);
 226
 227                 /*
 228                  * Make sure we unmap all failed CPUs
 229                  */
 230                 if (physid_to_cpu(phys_id) == -1) {
 231                         physid_clear(phys_id, phys_cpu_present_map);
 232                         printk("phys CPU#%d not responding - " \
 233                                 "cannot use it.\n", phys_id);
 234                 }
 235         }
 236
 237 smp_done:
 238         Dprintk("Boot done.\n");
 239 }
 240
 241 /*
 242  * init_ipi_lock : Initialize IPI locks.
 243  */
 244 static void __init init_ipi_lock(void)
 245 {
 246         int ipi;
 247
 248         for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
 249                 spin_lock_init(&ipi_lock[ipi]);
 250 }
 251
 252 /*==========================================================================*
 253  * Name:         do_boot_cpu
 254  *
 255  * Description:  This routine boot up one AP.
 256  *
 257  * Born on Date: 2002.02.05
 258  *
 259  * Arguments:    phys_id - Target CPU physical ID
 260  *
 261  * Returns:      void (cannot fail)
 262  *
 263  * Modification log:
 264  * Date       Who Description
 265  * ---------- --- --------------------------------------------------------
 266  * 2003-06-24 hy  modify for linux-2.5.69
 267  *
 268  *==========================================================================*/
 269 static void __init do_boot_cpu(int phys_id)
 270 {
 271         struct task_struct *idle;
 272         unsigned long send_status, boot_status;
 273         int timeout, cpu_id;
 274
 275         cpu_id = ++cpucount;
 276
 277         /*
 278          * We can't use kernel_thread since we must avoid to
 279          * reschedule the child.
 280          */
 281         idle = fork_idle(cpu_id);
 282         if (IS_ERR(idle))
 283                 panic("failed fork for CPU#%d.", cpu_id);
 284
 285         idle->thread.lr = (unsigned long)start_secondary;
 286
 287         map_cpu_to_physid(cpu_id, phys_id);
 288
 289         /* So we see what's up   */
 290         printk("Booting processor %d/%d\n", phys_id, cpu_id);
 291         stack_start.spi = (void *)idle->thread.sp;
 292         task_thread_info(idle)->cpu = cpu_id;
 293
 294         /*
 295          * Send Startup IPI
 296          *   1.IPI received by CPU#(phys_id).
 297          *   2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
 298          *   3.CPU#(phys_id) enter start_secondary()
 299          */
 300         send_status = 0;
 301         boot_status = 0;
 302
 303         cpu_set(phys_id, cpu_bootout_map);
 304
 305         /* Send Startup IPI */
 306         send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0);
 307
 308         Dprintk("Waiting for send to finish...\n");
 309         timeout = 0;
 310
 311         /* Wait 100[ms] */
 312         do {
 313                 Dprintk("+");
 314                 udelay(1000);
 315                 send_status = !cpu_isset(phys_id, cpu_bootin_map);
 316         } while (send_status && (timeout++ < 100));
 317
 318         Dprintk("After Startup.\n");
 319
 320         if (!send_status) {
 321                 /*
 322                  * allow APs to start initializing.
 323                  */
 324                 Dprintk("Before Callout %d.\n", cpu_id);
 325                 cpu_set(cpu_id, cpu_callout_map);
 326                 Dprintk("After Callout %d.\n", cpu_id);
 327
 328                 /*
 329                  * Wait 5s total for a response
 330                  */
 331                 for (timeout = 0; timeout < 5000; timeout++) {
 332                         if (cpu_isset(cpu_id, cpu_callin_map))
 333                                 break;  /* It has booted */
 334                         udelay(1000);
 335                 }
 336
 337                 if (cpu_isset(cpu_id, cpu_callin_map)) {
 338                         /* number CPUs logically, starting from 1 (BSP is 0) */
 339                         Dprintk("OK.\n");
 340                 } else {
 341                         boot_status = 1;
 342                         printk("Not responding.\n");
 343                 }
 344         } else
 345                 printk("IPI never delivered???\n");
 346
 347         if (send_status || boot_status) {
 348                 unmap_cpu_to_physid(cpu_id, phys_id);
 349                 cpu_clear(cpu_id, cpu_callout_map);
 350                 cpu_clear(cpu_id, cpu_callin_map);
 351                 cpu_clear(cpu_id, cpu_initialized);
 352                 cpucount--;
 353         }
 354 }
 355
 356 int __cpuinit __cpu_up(unsigned int cpu_id)
 357 {
 358         int timeout;
 359
 360         cpu_set(cpu_id, smp_commenced_mask);
 361
 362         /*
 363          * Wait 5s total for a response
 364          */
 365         for (timeout = 0; timeout < 5000; timeout++) {
 366                 if (cpu_isset(cpu_id, cpu_online_map))
 367                         break;
 368                 udelay(1000);
 369         }
 370         if (!cpu_isset(cpu_id, cpu_online_map))
 371                 BUG();
 372
 373         return 0;
 374 }
 375
 376 void __init smp_cpus_done(unsigned int max_cpus)
 377 {
 378         int cpu_id, timeout;
 379         unsigned long bogosum = 0;
 380
 381         for (timeout = 0; timeout < 5000; timeout++) {
 382                 if (cpus_equal(cpu_callin_map, cpu_online_map))
 383                         break;
 384                 udelay(1000);
 385         }
 386         if (!cpus_equal(cpu_callin_map, cpu_online_map))
 387                 BUG();
 388
 389         for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
 390                 show_cpu_info(cpu_id);
 391
 392         /*
 393          * Allow the user to impress friends.
 394          */
 395         Dprintk("Before bogomips.\n");
 396         if (cpucount) {
 397                 for_each_cpu_mask(cpu_id, cpu_online_map)
 398                         bogosum += cpu_data[cpu_id].loops_per_jiffy;
 399
 400                 printk(KERN_INFO "Total of %d processors activated " \
 401                         "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
 402                         bogosum / (500000 / HZ),
 403                         (bogosum / (5000 / HZ)) % 100);
 404                 Dprintk("Before bogocount - setting activated=1.\n");
 405         }
 406 }
 407
 408 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 409 /* Activate a secondary processor Routines                                   */
 410 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 411
 412 /*==========================================================================*
 413  * Name:         start_secondary
 414  *
 415  * Description:  This routine activate a secondary processor.
 416  *
 417  * Born on Date: 2002.02.05
 418  *
 419  * Arguments:    *unused - currently unused.
 420  *
 421  * Returns:      void (cannot fail)
 422  *
 423  * Modification log:
 424  * Date       Who Description
 425  * ---------- --- --------------------------------------------------------
 426  * 2003-06-24 hy  modify for linux-2.5.69
 427  *
 428  *==========================================================================*/
 429 int __init start_secondary(void *unused)
 430 {
 431         cpu_init();
 432         preempt_disable();
 433         smp_callin();
 434         while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
 435                 cpu_relax();
 436
 437         smp_online();
 438
 439         /*
 440          * low-memory mappings have been cleared, flush them from
 441          * the local TLBs too.
 442          */
 443         local_flush_tlb_all();
 444
 445         cpu_idle();
 446         return 0;
 447 }
 448
 449 /*==========================================================================*
 450  * Name:         smp_callin
 451  *
 452  * Description:  This routine activate a secondary processor.
 453  *
 454  * Born on Date: 2002.02.05
 455  *
 456  * Arguments:    NONE
 457  *
 458  * Returns:      void (cannot fail)
 459  *
 460  * Modification log:
 461  * Date       Who Description
 462  * ---------- --- --------------------------------------------------------
 463  * 2003-06-24 hy  modify for linux-2.5.69
 464  *
 465  *==========================================================================*/
 466 static void __init smp_callin(void)
 467 {
 468         int phys_id = hard_smp_processor_id();
 469         int cpu_id = smp_processor_id();
 470         unsigned long timeout;
 471
 472         if (cpu_isset(cpu_id, cpu_callin_map)) {
 473                 printk("huh, phys CPU#%d, CPU#%d already present??\n",
 474                         phys_id, cpu_id);
 475                 BUG();
 476         }
 477         Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
 478
 479         /* Waiting 2s total for startup (udelay is not yet working) */
 480         timeout = jiffies + (2 * HZ);
 481         while (time_before(jiffies, timeout)) {
 482                 /* Has the boot CPU finished it's STARTUP sequence ? */
 483                 if (cpu_isset(cpu_id, cpu_callout_map))
 484                         break;
 485                 cpu_relax();
 486         }
 487
 488         if (!time_before(jiffies, timeout)) {
 489                 printk("BUG: CPU#%d started up but did not get a callout!\n",
 490                         cpu_id);
 491                 BUG();
 492         }
 493
 494         /* Allow the master to continue. */
 495         cpu_set(cpu_id, cpu_callin_map);
 496 }
 497
 498 static void __init smp_online(void)
 499 {
 500         int cpu_id = smp_processor_id();
 501
 502         notify_cpu_starting(cpu_id);
 503
 504         local_irq_enable();
 505
 506         /* Get our bogomips. */
 507         calibrate_delay();
 508
 509         /* Save our processor parameters */
 510         smp_store_cpu_info(cpu_id);
 511
 512         cpu_set(cpu_id, cpu_online_map);
 513 }
 514
 515 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 516 /* Boot up CPUs common Routines                                              */
 517 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 518 static void __init show_mp_info(int nr_cpu)
 519 {
 520         int i;
 521         char cpu_model0[17], cpu_model1[17], cpu_ver[9];
 522
 523         strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
 524         strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
 525         strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
 526
 527         cpu_model0[16] = '\0';
 528         for (i = 15 ; i >= 0 ; i--) {
 529                 if (cpu_model0[i] != ' ')
 530                         break;
 531                 cpu_model0[i] = '\0';
 532         }
 533         cpu_model1[16] = '\0';
 534         for (i = 15 ; i >= 0 ; i--) {
 535                 if (cpu_model1[i] != ' ')
 536                         break;
 537                 cpu_model1[i] = '\0';
 538         }
 539         cpu_ver[8] = '\0';
 540         for (i = 7 ; i >= 0 ; i--) {
 541                 if (cpu_ver[i] != ' ')
 542                         break;
 543                 cpu_ver[i] = '\0';
 544         }
 545
 546         printk(KERN_INFO "M32R-mp information\n");
 547         printk(KERN_INFO "  On-chip CPUs : %d\n", nr_cpu);
 548         printk(KERN_INFO "  CPU model : %s/%s(%s)\n", cpu_model0,
 549                 cpu_model1, cpu_ver);
 550 }
 551
 552 /*
 553  * The bootstrap kernel entry code has set these up. Save them for
 554  * a given CPU
 555  */
 556 static void __init smp_store_cpu_info(int cpu_id)
 557 {
 558         struct cpuinfo_m32r *ci = cpu_data + cpu_id;
 559
 560         *ci = boot_cpu_data;
 561         ci->loops_per_jiffy = loops_per_jiffy;
 562 }
 563
 564 static void __init show_cpu_info(int cpu_id)
 565 {
 566         struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
 567
 568         printk("CPU#%d : ", cpu_id);
 569
 570 #define PRINT_CLOCK(name, value) \
 571         printk(name " clock %d.%02dMHz", \
 572                 ((value) / 1000000), ((value) % 1000000) / 10000)
 573
 574         PRINT_CLOCK("CPU", (int)ci->cpu_clock);
 575         PRINT_CLOCK(", Bus", (int)ci->bus_clock);
 576         printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
 577 }
 578
 579 /*
 580  * the frequency of the profiling timer can be changed
 581  * by writing a multiplier value into /proc/profile.
 582  */
 583 int setup_profiling_timer(unsigned int multiplier)
 584 {
 585         int i;
 586
 587         /*
 588          * Sanity check. [at least 500 APIC cycles should be
 589          * between APIC interrupts as a rule of thumb, to avoid
 590          * irqs flooding us]
 591          */
 592         if ( (!multiplier) || (calibration_result / multiplier < 500))
 593                 return -EINVAL;
 594
 595         /*
 596          * Set the new multiplier for each CPU. CPUs don't start using the
 597          * new values until the next timer interrupt in which they do process
 598          * accounting. At that time they also adjust their APIC timers
 599          * accordingly.
 600          */
 601         for (i = 0; i < NR_CPUS; ++i)
 602                 per_cpu(prof_multiplier, i) = multiplier;
 603
 604         return 0;
 605 }
 606
 607 /* Initialize all maps between cpu number and apicids */
 608 static void __init init_cpu_to_physid(void)
 609 {
 610         int  i;
 611
 612         for (i = 0 ; i < NR_CPUS ; i++) {
 613                 cpu_2_physid[i] = -1;
 614                 physid_2_cpu[i] = -1;
 615         }
 616 }
 617
 618 /*
 619  * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
 620  * else physical apic ids
 621  */
 622 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
 623 {
 624         physid_2_cpu[phys_id] = cpu_id;
 625         cpu_2_physid[cpu_id] = phys_id;
 626 }
 627
 628 /*
 629  * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
 630  * else physical apic ids
 631  */
 632 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
 633 {
 634         physid_2_cpu[phys_id] = -1;
 635         cpu_2_physid[cpu_id] = -1;
 636 }