arch/sparc64/kernel/setup.c

   1 /*  $Id: setup.c,v 1.72 2002/02/09 19:49:30 davem Exp $
   2  *  linux/arch/sparc64/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
   5  *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/stddef.h>
  13 #include <linux/unistd.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/slab.h>
  16 #include <asm/smp.h>
  17 #include <linux/user.h>
  18 #include <linux/a.out.h>
  19 #include <linux/tty.h>
  20 #include <linux/delay.h>
  21 #include <linux/config.h>
  22 #include <linux/fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/kdev_t.h>
  26 #include <linux/major.h>
  27 #include <linux/string.h>
  28 #include <linux/init.h>
  29 #include <linux/inet.h>
  30 #include <linux/console.h>
  31 #include <linux/root_dev.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/cpu.h>
  34 #include <linux/initrd.h>
  35
  36 #include <asm/segment.h>
  37 #include <asm/system.h>
  38 #include <asm/io.h>
  39 #include <asm/processor.h>
  40 #include <asm/oplib.h>
  41 #include <asm/page.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/idprom.h>
  44 #include <asm/head.h>
  45 #include <asm/starfire.h>
  46 #include <asm/mmu_context.h>
  47 #include <asm/timer.h>
  48 #include <asm/sections.h>
  49 #include <asm/setup.h>
  50
  51 #ifdef CONFIG_IP_PNP
  52 #include <net/ipconfig.h>
  53 #endif
  54
  55 struct screen_info screen_info = {
  56         0, 0,                   /* orig-x, orig-y */
  57         0,                      /* unused */
  58         0,                      /* orig-video-page */
  59         0,                      /* orig-video-mode */
  60         128,                    /* orig-video-cols */
  61         0, 0, 0,                /* unused, ega_bx, unused */
  62         54,                     /* orig-video-lines */
  63         0,                      /* orig-video-isVGA */
  64         16                      /* orig-video-points */
  65 };
  66
  67 /* Typing sync at the prom prompt calls the function pointed to by
  68  * the sync callback which I set to the following function.
  69  * This should sync all filesystems and return, for now it just
  70  * prints out pretty messages and returns.
  71  */
  72
  73 void (*prom_palette)(int);
  74 void (*prom_keyboard)(void);
  75
  76 static void
  77 prom_console_write(struct console *con, const char *s, unsigned n)
  78 {
  79         prom_write(s, n);
  80 }
  81
  82 static struct console prom_console = {
  83         .name =         "prom",
  84         .write =        prom_console_write,
  85         .flags =        CON_CONSDEV | CON_ENABLED,
  86         .index =        -1,
  87 };
  88
  89 #define PROM_TRUE       -1
  90 #define PROM_FALSE      0
  91
  92 /* Pretty sick eh? */
  93 int prom_callback(long *args)
  94 {
  95         struct console *cons, *saved_console = NULL;
  96         unsigned long flags;
  97         char *cmd;
  98         extern spinlock_t prom_entry_lock;
  99
 100         if (!args)
 101                 return -1;
 102         if (!(cmd = (char *)args[0]))
 103                 return -1;
 104
 105         /*
 106          * The callback can be invoked on the cpu that first dropped
 107          * into prom_cmdline after taking the serial interrupt, or on
 108          * a slave processor that was smp_captured() if the
 109          * administrator has done a switch-cpu inside obp. In either
 110          * case, the cpu is marked as in-interrupt. Drop IRQ locks.
 111          */
 112         irq_exit();
 113
 114         /* XXX Revisit the locking here someday.  This is a debugging
 115          * XXX feature so it isnt all that critical.  -DaveM
 116          */
 117         local_irq_save(flags);
 118
 119         spin_unlock(&prom_entry_lock);
 120         cons = console_drivers;
 121         while (cons) {
 122                 unregister_console(cons);
 123                 cons->flags &= ~(CON_PRINTBUFFER);
 124                 cons->next = saved_console;
 125                 saved_console = cons;
 126                 cons = console_drivers;
 127         }
 128         register_console(&prom_console);
 129         if (!strcmp(cmd, "sync")) {
 130                 prom_printf("PROM `%s' command...\n", cmd);
 131                 show_free_areas();
 132                 if (current->pid != 0) {
 133                         local_irq_enable();
 134                         sys_sync();
 135                         local_irq_disable();
 136                 }
 137                 args[2] = 0;
 138                 args[args[1] + 3] = -1;
 139                 prom_printf("Returning to PROM\n");
 140         } else if (!strcmp(cmd, "va>tte-data")) {
 141                 unsigned long ctx, va;
 142                 unsigned long tte = 0;
 143                 long res = PROM_FALSE;
 144
 145                 ctx = args[3];
 146                 va = args[4];
 147                 if (ctx) {
 148                         /*
 149                          * Find process owning ctx, lookup mapping.
 150                          */
 151                         struct task_struct *p;
 152                         struct mm_struct *mm = NULL;
 153                         pgd_t *pgdp;
 154                         pud_t *pudp;
 155                         pmd_t *pmdp;
 156                         pte_t *ptep;
 157
 158                         for_each_process(p) {
 159                                 mm = p->mm;
 160                                 if (CTX_HWBITS(mm->context) == ctx)
 161                                         break;
 162                         }
 163                         if (!mm ||
 164                             CTX_HWBITS(mm->context) != ctx)
 165                                 goto done;
 166
 167                         pgdp = pgd_offset(mm, va);
 168                         if (pgd_none(*pgdp))
 169                                 goto done;
 170                         pudp = pud_offset(pgdp, va);
 171                         if (pud_none(*pudp))
 172                                 goto done;
 173                         pmdp = pmd_offset(pudp, va);
 174                         if (pmd_none(*pmdp))
 175                                 goto done;
 176
 177                         /* Preemption implicitly disabled by virtue of
 178                          * being called from inside OBP.
 179                          */
 180                         ptep = pte_offset_map(pmdp, va);
 181                         if (pte_present(*ptep)) {
 182                                 tte = pte_val(*ptep);
 183                                 res = PROM_TRUE;
 184                         }
 185                         pte_unmap(ptep);
 186                         goto done;
 187                 }
 188
 189                 if ((va >= KERNBASE) && (va < (KERNBASE + (4 * 1024 * 1024)))) {
 190                         /* Spitfire Errata #32 workaround */
 191                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
 192                                              "flush     %%g6"
 193                                              : /* No outputs */
 194                                              : "r" (0),
 195                                              "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
 196
 197                         /*
 198                          * Locked down tlb entry.
 199                          */
 200
 201                         if (tlb_type == spitfire)
 202                                 tte = spitfire_get_dtlb_data(SPITFIRE_HIGHEST_LOCKED_TLBENT);
 203                         else if (tlb_type == cheetah || tlb_type == cheetah_plus)
 204                                 tte = cheetah_get_ldtlb_data(CHEETAH_HIGHEST_LOCKED_TLBENT);
 205
 206                         res = PROM_TRUE;
 207                         goto done;
 208                 }
 209
 210                 if (va < PGDIR_SIZE) {
 211                         /*
 212                          * vmalloc or prom_inherited mapping.
 213                          */
 214                         pgd_t *pgdp;
 215                         pud_t *pudp;
 216                         pmd_t *pmdp;
 217                         pte_t *ptep;
 218                         int error;
 219
 220                         if ((va >= LOW_OBP_ADDRESS) && (va < HI_OBP_ADDRESS)) {
 221                                 tte = prom_virt_to_phys(va, &error);
 222                                 if (!error)
 223                                         res = PROM_TRUE;
 224                                 goto done;
 225                         }
 226                         pgdp = pgd_offset_k(va);
 227                         if (pgd_none(*pgdp))
 228                                 goto done;
 229                         pudp = pud_offset(pgdp, va);
 230                         if (pud_none(*pudp))
 231                                 goto done;
 232                         pmdp = pmd_offset(pudp, va);
 233                         if (pmd_none(*pmdp))
 234                                 goto done;
 235
 236                         /* Preemption implicitly disabled by virtue of
 237                          * being called from inside OBP.
 238                          */
 239                         ptep = pte_offset_kernel(pmdp, va);
 240                         if (pte_present(*ptep)) {
 241                                 tte = pte_val(*ptep);
 242                                 res = PROM_TRUE;
 243                         }
 244                         goto done;
 245                 }
 246
 247                 if (va < PAGE_OFFSET) {
 248                         /*
 249                          * No mappings here.
 250                          */
 251                         goto done;
 252                 }
 253
 254                 if (va & (1UL << 40)) {
 255                         /*
 256                          * I/O page.
 257                          */
 258
 259                         tte = (__pa(va) & _PAGE_PADDR) |
 260                               _PAGE_VALID | _PAGE_SZ4MB |
 261                               _PAGE_E | _PAGE_P | _PAGE_W;
 262                         res = PROM_TRUE;
 263                         goto done;
 264                 }
 265
 266                 /*
 267                  * Normal page.
 268                  */
 269                 tte = (__pa(va) & _PAGE_PADDR) |
 270                       _PAGE_VALID | _PAGE_SZ4MB |
 271                       _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W;
 272                 res = PROM_TRUE;
 273
 274         done:
 275                 if (res == PROM_TRUE) {
 276                         args[2] = 3;
 277                         args[args[1] + 3] = 0;
 278                         args[args[1] + 4] = res;
 279                         args[args[1] + 5] = tte;
 280                 } else {
 281                         args[2] = 2;
 282                         args[args[1] + 3] = 0;
 283                         args[args[1] + 4] = res;
 284                 }
 285         } else if (!strcmp(cmd, ".soft1")) {
 286                 unsigned long tte;
 287
 288                 tte = args[3];
 289                 prom_printf("%lx:\"%s%s%s%s%s\" ",
 290                             (tte & _PAGE_SOFT) >> 7,
 291                             tte & _PAGE_MODIFIED ? "M" : "-",
 292                             tte & _PAGE_ACCESSED ? "A" : "-",
 293                             tte & _PAGE_READ     ? "W" : "-",
 294                             tte & _PAGE_WRITE    ? "R" : "-",
 295                             tte & _PAGE_PRESENT  ? "P" : "-");
 296
 297                 args[2] = 2;
 298                 args[args[1] + 3] = 0;
 299                 args[args[1] + 4] = PROM_TRUE;
 300         } else if (!strcmp(cmd, ".soft2")) {
 301                 unsigned long tte;
 302
 303                 tte = args[3];
 304                 prom_printf("%lx ", (tte & 0x07FC000000000000UL) >> 50);
 305
 306                 args[2] = 2;
 307                 args[args[1] + 3] = 0;
 308                 args[args[1] + 4] = PROM_TRUE;
 309         } else {
 310                 prom_printf("unknown PROM `%s' command...\n", cmd);
 311         }
 312         unregister_console(&prom_console);
 313         while (saved_console) {
 314                 cons = saved_console;
 315                 saved_console = cons->next;
 316                 register_console(cons);
 317         }
 318         spin_lock(&prom_entry_lock);
 319         local_irq_restore(flags);
 320
 321         /*
 322          * Restore in-interrupt status for a resume from obp.
 323          */
 324         irq_enter();
 325         return 0;
 326 }
 327
 328 unsigned int boot_flags = 0;
 329 #define BOOTME_DEBUG  0x1
 330 #define BOOTME_SINGLE 0x2
 331
 332 /* Exported for mm/init.c:paging_init. */
 333 unsigned long cmdline_memory_size = 0;
 334
 335 static struct console prom_debug_console = {
 336         .name =         "debug",
 337         .write =        prom_console_write,
 338         .flags =        CON_PRINTBUFFER,
 339         .index =        -1,
 340 };
 341
 342 /* XXX Implement this at some point... */
 343 void kernel_enter_debugger(void)
 344 {
 345 }
 346
 347 int obp_system_intr(void)
 348 {
 349         if (boot_flags & BOOTME_DEBUG) {
 350                 printk("OBP: system interrupted\n");
 351                 prom_halt();
 352                 return 1;
 353         }
 354         return 0;
 355 }
 356
 357 /*
 358  * Process kernel command line switches that are specific to the
 359  * SPARC or that require special low-level processing.
 360  */
 361 static void __init process_switch(char c)
 362 {
 363         switch (c) {
 364         case 'd':
 365                 boot_flags |= BOOTME_DEBUG;
 366                 break;
 367         case 's':
 368                 boot_flags |= BOOTME_SINGLE;
 369                 break;
 370         case 'h':
 371                 prom_printf("boot_flags_init: Halt!\n");
 372                 prom_halt();
 373                 break;
 374         case 'p':
 375                 /* Use PROM debug console. */
 376                 register_console(&prom_debug_console);
 377                 break;
 378         default:
 379                 printk("Unknown boot switch (-%c)\n", c);
 380                 break;
 381         }
 382 }
 383
 384 static void __init process_console(char *commands)
 385 {
 386         serial_console = 0;
 387         commands += 8;
 388         /* Linux-style serial */
 389         if (!strncmp(commands, "ttyS", 4))
 390                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
 391         else if (!strncmp(commands, "tty", 3)) {
 392                 char c = *(commands + 3);
 393                 /* Solaris-style serial */
 394                 if (c == 'a' || c == 'b') {
 395                         serial_console = c - 'a' + 1;
 396                         prom_printf ("Using /dev/tty%c as console.\n", c);
 397                 }
 398                 /* else Linux-style fbcon, not serial */
 399         }
 400 #if defined(CONFIG_PROM_CONSOLE)
 401         if (!strncmp(commands, "prom", 4)) {
 402                 char *p;
 403
 404                 for (p = commands - 8; *p && *p != ' '; p++)
 405                         *p = ' ';
 406                 conswitchp = &prom_con;
 407         }
 408 #endif
 409 }
 410
 411 static void __init boot_flags_init(char *commands)
 412 {
 413         while (*commands) {
 414                 /* Move to the start of the next "argument". */
 415                 while (*commands && *commands == ' ')
 416                         commands++;
 417
 418                 /* Process any command switches, otherwise skip it. */
 419                 if (*commands == '\0')
 420                         break;
 421                 if (*commands == '-') {
 422                         commands++;
 423                         while (*commands && *commands != ' ')
 424                                 process_switch(*commands++);
 425                         continue;
 426                 }
 427                 if (!strncmp(commands, "console=", 8)) {
 428                         process_console(commands);
 429                 } else if (!strncmp(commands, "mem=", 4)) {
 430                         /*
 431                          * "mem=XXX[kKmM]" overrides the PROM-reported
 432                          * memory size.
 433                          */
 434                         cmdline_memory_size = simple_strtoul(commands + 4,
 435                                                              &commands, 0);
 436                         if (*commands == 'K' || *commands == 'k') {
 437                                 cmdline_memory_size <<= 10;
 438                                 commands++;
 439                         } else if (*commands=='M' || *commands=='m') {
 440                                 cmdline_memory_size <<= 20;
 441                                 commands++;
 442                         }
 443                 }
 444                 while (*commands && *commands != ' ')
 445                         commands++;
 446         }
 447 }
 448
 449 extern int prom_probe_memory(void);
 450 extern unsigned long start, end;
 451 extern void panic_setup(char *, int *);
 452
 453 extern unsigned short root_flags;
 454 extern unsigned short root_dev;
 455 extern unsigned short ram_flags;
 456 #define RAMDISK_IMAGE_START_MASK        0x07FF
 457 #define RAMDISK_PROMPT_FLAG             0x8000
 458 #define RAMDISK_LOAD_FLAG               0x4000
 459
 460 extern int root_mountflags;
 461
 462 char reboot_command[COMMAND_LINE_SIZE];
 463
 464 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 465
 466 void register_prom_callbacks(void)
 467 {
 468         prom_setcallback(prom_callback);
 469         prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
 470                    "' linux-va>tte-data to va>tte-data");
 471         prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
 472                    "' linux-.soft1 to .soft1");
 473         prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
 474                    "' linux-.soft2 to .soft2");
 475 }
 476
 477 extern void paging_init(void);
 478
 479 void __init setup_arch(char **cmdline_p)
 480 {
 481         unsigned long highest_paddr;
 482         int i;
 483
 484         /* Initialize PROM console and command line. */
 485         *cmdline_p = prom_getbootargs();
 486         strcpy(saved_command_line, *cmdline_p);
 487
 488         printk("ARCH: SUN4U\n");
 489
 490 #ifdef CONFIG_DUMMY_CONSOLE
 491         conswitchp = &dummy_con;
 492 #elif defined(CONFIG_PROM_CONSOLE)
 493         conswitchp = &prom_con;
 494 #endif
 495
 496 #ifdef CONFIG_SMP
 497         i = (unsigned long)&irq_stat[1] - (unsigned long)&irq_stat[0];
 498         if ((i == SMP_CACHE_BYTES) || (i == (2 * SMP_CACHE_BYTES))) {
 499                 extern unsigned int irqsz_patchme[1];
 500                 irqsz_patchme[0] |= ((i == SMP_CACHE_BYTES) ? SMP_CACHE_BYTES_SHIFT : \
 501                                                         SMP_CACHE_BYTES_SHIFT + 1);
 502                 flushi((long)&irqsz_patchme[0]);
 503         } else {
 504                 prom_printf("Unexpected size of irq_stat[] elements\n");
 505                 prom_halt();
 506         }
 507 #endif
 508         /* Work out if we are starfire early on */
 509         check_if_starfire();
 510
 511         boot_flags_init(*cmdline_p);
 512
 513         idprom_init();
 514         (void) prom_probe_memory();
 515
 516         /* In paging_init() we tip off this value to see if we need
 517          * to change init_mm.pgd to point to the real alias mapping.
 518          */
 519         phys_base = 0xffffffffffffffffUL;
 520         highest_paddr = 0UL;
 521         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 522                 unsigned long top;
 523
 524                 if (sp_banks[i].base_addr < phys_base)
 525                         phys_base = sp_banks[i].base_addr;
 526                 top = sp_banks[i].base_addr +
 527                         sp_banks[i].num_bytes;
 528                 if (highest_paddr < top)
 529                         highest_paddr = top;
 530         }
 531         pfn_base = phys_base >> PAGE_SHIFT;
 532
 533         switch (tlb_type) {
 534         default:
 535         case spitfire:
 536                 kern_base = spitfire_get_itlb_data(sparc64_highest_locked_tlbent());
 537                 kern_base &= _PAGE_PADDR_SF;
 538                 break;
 539
 540         case cheetah:
 541         case cheetah_plus:
 542                 kern_base = cheetah_get_litlb_data(sparc64_highest_locked_tlbent());
 543                 kern_base &= _PAGE_PADDR;
 544                 break;
 545         };
 546
 547         kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
 548
 549         if (!root_flags)
 550                 root_mountflags &= ~MS_RDONLY;
 551         ROOT_DEV = old_decode_dev(root_dev);
 552 #ifdef CONFIG_BLK_DEV_INITRD
 553         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 554         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 555         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 556 #endif
 557
 558         init_task.thread_info->kregs = &fake_swapper_regs;
 559
 560 #ifdef CONFIG_IP_PNP
 561         if (!ic_set_manually) {
 562                 int chosen = prom_finddevice ("/chosen");
 563                 u32 cl, sv, gw;
 564
 565                 cl = prom_getintdefault (chosen, "client-ip", 0);
 566                 sv = prom_getintdefault (chosen, "server-ip", 0);
 567                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
 568                 if (cl && sv) {
 569                         ic_myaddr = cl;
 570                         ic_servaddr = sv;
 571                         if (gw)
 572                                 ic_gateway = gw;
 573 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 574                         ic_proto_enabled = 0;
 575 #endif
 576                 }
 577         }
 578 #endif
 579
 580         paging_init();
 581 }
 582
 583 static int __init set_preferred_console(void)
 584 {
 585         int idev, odev;
 586
 587         /* The user has requested a console so this is already set up. */
 588         if (serial_console >= 0)
 589                 return -EBUSY;
 590
 591         idev = prom_query_input_device();
 592         odev = prom_query_output_device();
 593         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 594                 serial_console = 0;
 595         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 596                 serial_console = 1;
 597         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 598                 serial_console = 2;
 599         } else {
 600                 prom_printf("Inconsistent console: "
 601                             "input %d, output %d\n",
 602                             idev, odev);
 603                 prom_halt();
 604         }
 605
 606         if (serial_console)
 607                 return add_preferred_console("ttyS", serial_console - 1, NULL);
 608
 609         return -ENODEV;
 610 }
 611 console_initcall(set_preferred_console);
 612
 613 /* BUFFER is PAGE_SIZE bytes long. */
 614
 615 extern char *sparc_cpu_type;
 616 extern char *sparc_fpu_type;
 617
 618 extern void smp_info(struct seq_file *);
 619 extern void smp_bogo(struct seq_file *);
 620 extern void mmu_info(struct seq_file *);
 621
 622 static int show_cpuinfo(struct seq_file *m, void *__unused)
 623 {
 624         seq_printf(m,
 625                    "cpu\t\t: %s\n"
 626                    "fpu\t\t: %s\n"
 627                    "promlib\t\t: Version 3 Revision %d\n"
 628                    "prom\t\t: %d.%d.%d\n"
 629                    "type\t\t: sun4u\n"
 630                    "ncpus probed\t: %ld\n"
 631                    "ncpus active\t: %ld\n"
 632 #ifndef CONFIG_SMP
 633                    "Cpu0Bogo\t: %lu.%02lu\n"
 634                    "Cpu0ClkTck\t: %016lx\n"
 635 #endif
 636                    ,
 637                    sparc_cpu_type,
 638                    sparc_fpu_type,
 639                    prom_rev,
 640                    prom_prev >> 16,
 641                    (prom_prev >> 8) & 0xff,
 642                    prom_prev & 0xff,
 643                    (long)num_possible_cpus(),
 644                    (long)num_online_cpus()
 645 #ifndef CONFIG_SMP
 646                    , cpu_data(0).udelay_val/(500000/HZ),
 647                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 648                    cpu_data(0).clock_tick
 649 #endif
 650                 );
 651 #ifdef CONFIG_SMP
 652         smp_bogo(m);
 653 #endif
 654         mmu_info(m);
 655 #ifdef CONFIG_SMP
 656         smp_info(m);
 657 #endif
 658         return 0;
 659 }
 660
 661 static void *c_start(struct seq_file *m, loff_t *pos)
 662 {
 663         /* The pointer we are returning is arbitrary,
 664          * it just has to be non-NULL and not IS_ERR
 665          * in the success case.
 666          */
 667         return *pos == 0 ? &c_start : NULL;
 668 }
 669
 670 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 671 {
 672         ++*pos;
 673         return c_start(m, pos);
 674 }
 675
 676 static void c_stop(struct seq_file *m, void *v)
 677 {
 678 }
 679
 680 struct seq_operations cpuinfo_op = {
 681         .start =c_start,
 682         .next = c_next,
 683         .stop = c_stop,
 684         .show = show_cpuinfo,
 685 };
 686
 687 extern int stop_a_enabled;
 688
 689 void sun_do_break(void)
 690 {
 691         if (!stop_a_enabled)
 692                 return;
 693
 694         prom_printf("\n");
 695         flush_user_windows();
 696
 697         prom_cmdline();
 698 }
 699
 700 int serial_console = -1;
 701 int stop_a_enabled = 1;
 702
 703 static int __init topology_init(void)
 704 {
 705         int i, err;
 706
 707         err = -ENOMEM;
 708         for (i = 0; i < NR_CPUS; i++) {
 709                 if (cpu_possible(i)) {
 710                         struct cpu *p = kmalloc(sizeof(*p), GFP_KERNEL);
 711
 712                         if (p) {
 713                                 memset(p, 0, sizeof(*p));
 714                                 register_cpu(p, i, NULL);
 715                                 err = 0;
 716                         }
 717                 }
 718         }
 719
 720         return err;
 721 }
 722
 723 subsys_initcall(topology_init);