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/system.h>
  37 #include <asm/io.h>
  38 #include <asm/processor.h>
  39 #include <asm/oplib.h>
  40 #include <asm/page.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/idprom.h>
  43 #include <asm/head.h>
  44 #include <asm/starfire.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/timer.h>
  47 #include <asm/sections.h>
  48 #include <asm/setup.h>
  49 #include <asm/mmu.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                         pte_t pte;
 158
 159                         for_each_process(p) {
 160                                 mm = p->mm;
 161                                 if (CTX_NRBITS(mm->context) == ctx)
 162                                         break;
 163                         }
 164                         if (!mm ||
 165                             CTX_NRBITS(mm->context) != ctx)
 166                                 goto done;
 167
 168                         pgdp = pgd_offset(mm, va);
 169                         if (pgd_none(*pgdp))
 170                                 goto done;
 171                         pudp = pud_offset(pgdp, va);
 172                         if (pud_none(*pudp))
 173                                 goto done;
 174                         pmdp = pmd_offset(pudp, va);
 175                         if (pmd_none(*pmdp))
 176                                 goto done;
 177
 178                         /* Preemption implicitly disabled by virtue of
 179                          * being called from inside OBP.
 180                          */
 181                         ptep = pte_offset_map(pmdp, va);
 182                         pte = *ptep;
 183                         if (pte_present(pte)) {
 184                                 tte = pte_val(pte);
 185                                 res = PROM_TRUE;
 186                         }
 187                         pte_unmap(ptep);
 188                         goto done;
 189                 }
 190
 191                 if ((va >= KERNBASE) && (va < (KERNBASE + (4 * 1024 * 1024)))) {
 192                         if (tlb_type == spitfire) {
 193                                 extern unsigned long sparc64_kern_pri_context;
 194
 195                                 /* Spitfire Errata #32 workaround */
 196                                 __asm__ __volatile__(
 197                                         "stxa   %0, [%1] %2\n\t"
 198                                         "flush  %%g6"
 199                                         : /* No outputs */
 200                                         : "r" (sparc64_kern_pri_context),
 201                                           "r" (PRIMARY_CONTEXT),
 202                                           "i" (ASI_DMMU));
 203                         }
 204
 205                         /*
 206                          * Locked down tlb entry.
 207                          */
 208
 209                         if (tlb_type == spitfire) {
 210                                 tte = spitfire_get_dtlb_data(SPITFIRE_HIGHEST_LOCKED_TLBENT);
 211                                 res = PROM_TRUE;
 212                         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 213                                 tte = cheetah_get_ldtlb_data(CHEETAH_HIGHEST_LOCKED_TLBENT);
 214                                 res = PROM_TRUE;
 215                         }
 216                         goto done;
 217                 }
 218
 219                 if (va < PGDIR_SIZE) {
 220                         /*
 221                          * vmalloc or prom_inherited mapping.
 222                          */
 223                         pgd_t *pgdp;
 224                         pud_t *pudp;
 225                         pmd_t *pmdp;
 226                         pte_t *ptep;
 227                         pte_t pte;
 228                         int error;
 229
 230                         if ((va >= LOW_OBP_ADDRESS) && (va < HI_OBP_ADDRESS)) {
 231                                 tte = prom_virt_to_phys(va, &error);
 232                                 if (!error)
 233                                         res = PROM_TRUE;
 234                                 goto done;
 235                         }
 236                         pgdp = pgd_offset_k(va);
 237                         if (pgd_none(*pgdp))
 238                                 goto done;
 239                         pudp = pud_offset(pgdp, va);
 240                         if (pud_none(*pudp))
 241                                 goto done;
 242                         pmdp = pmd_offset(pudp, va);
 243                         if (pmd_none(*pmdp))
 244                                 goto done;
 245
 246                         /* Preemption implicitly disabled by virtue of
 247                          * being called from inside OBP.
 248                          */
 249                         ptep = pte_offset_kernel(pmdp, va);
 250                         pte = *ptep;
 251                         if (pte_present(pte)) {
 252                                 tte = pte_val(pte);
 253                                 res = PROM_TRUE;
 254                         }
 255                         goto done;
 256                 }
 257
 258                 if (va < PAGE_OFFSET) {
 259                         /*
 260                          * No mappings here.
 261                          */
 262                         goto done;
 263                 }
 264
 265                 if (va & (1UL << 40)) {
 266                         /*
 267                          * I/O page.
 268                          */
 269
 270                         tte = (__pa(va) & _PAGE_PADDR) |
 271                               _PAGE_VALID | _PAGE_SZ4MB |
 272                               _PAGE_E | _PAGE_P | _PAGE_W;
 273                         res = PROM_TRUE;
 274                         goto done;
 275                 }
 276
 277                 /*
 278                  * Normal page.
 279                  */
 280                 tte = (__pa(va) & _PAGE_PADDR) |
 281                       _PAGE_VALID | _PAGE_SZ4MB |
 282                       _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W;
 283                 res = PROM_TRUE;
 284
 285         done:
 286                 if (res == PROM_TRUE) {
 287                         args[2] = 3;
 288                         args[args[1] + 3] = 0;
 289                         args[args[1] + 4] = res;
 290                         args[args[1] + 5] = tte;
 291                 } else {
 292                         args[2] = 2;
 293                         args[args[1] + 3] = 0;
 294                         args[args[1] + 4] = res;
 295                 }
 296         } else if (!strcmp(cmd, ".soft1")) {
 297                 unsigned long tte;
 298
 299                 tte = args[3];
 300                 prom_printf("%lx:\"%s%s%s%s%s\" ",
 301                             (tte & _PAGE_SOFT) >> 7,
 302                             tte & _PAGE_MODIFIED ? "M" : "-",
 303                             tte & _PAGE_ACCESSED ? "A" : "-",
 304                             tte & _PAGE_READ     ? "W" : "-",
 305                             tte & _PAGE_WRITE    ? "R" : "-",
 306                             tte & _PAGE_PRESENT  ? "P" : "-");
 307
 308                 args[2] = 2;
 309                 args[args[1] + 3] = 0;
 310                 args[args[1] + 4] = PROM_TRUE;
 311         } else if (!strcmp(cmd, ".soft2")) {
 312                 unsigned long tte;
 313
 314                 tte = args[3];
 315                 prom_printf("%lx ", (tte & 0x07FC000000000000UL) >> 50);
 316
 317                 args[2] = 2;
 318                 args[args[1] + 3] = 0;
 319                 args[args[1] + 4] = PROM_TRUE;
 320         } else {
 321                 prom_printf("unknown PROM `%s' command...\n", cmd);
 322         }
 323         unregister_console(&prom_console);
 324         while (saved_console) {
 325                 cons = saved_console;
 326                 saved_console = cons->next;
 327                 register_console(cons);
 328         }
 329         spin_lock(&prom_entry_lock);
 330         local_irq_restore(flags);
 331
 332         /*
 333          * Restore in-interrupt status for a resume from obp.
 334          */
 335         irq_enter();
 336         return 0;
 337 }
 338
 339 unsigned int boot_flags = 0;
 340 #define BOOTME_DEBUG  0x1
 341 #define BOOTME_SINGLE 0x2
 342
 343 /* Exported for mm/init.c:paging_init. */
 344 unsigned long cmdline_memory_size = 0;
 345
 346 static struct console prom_debug_console = {
 347         .name =         "debug",
 348         .write =        prom_console_write,
 349         .flags =        CON_PRINTBUFFER,
 350         .index =        -1,
 351 };
 352
 353 /* XXX Implement this at some point... */
 354 void kernel_enter_debugger(void)
 355 {
 356 }
 357
 358 int obp_system_intr(void)
 359 {
 360         if (boot_flags & BOOTME_DEBUG) {
 361                 printk("OBP: system interrupted\n");
 362                 prom_halt();
 363                 return 1;
 364         }
 365         return 0;
 366 }
 367
 368 /*
 369  * Process kernel command line switches that are specific to the
 370  * SPARC or that require special low-level processing.
 371  */
 372 static void __init process_switch(char c)
 373 {
 374         switch (c) {
 375         case 'd':
 376                 boot_flags |= BOOTME_DEBUG;
 377                 break;
 378         case 's':
 379                 boot_flags |= BOOTME_SINGLE;
 380                 break;
 381         case 'h':
 382                 prom_printf("boot_flags_init: Halt!\n");
 383                 prom_halt();
 384                 break;
 385         case 'p':
 386                 /* Use PROM debug console. */
 387                 register_console(&prom_debug_console);
 388                 break;
 389         case 'P':
 390                 /* Force UltraSPARC-III P-Cache on. */
 391                 if (tlb_type != cheetah) {
 392                         printk("BOOT: Ignoring P-Cache force option.\n");
 393                         break;
 394                 }
 395                 cheetah_pcache_forced_on = 1;
 396                 add_taint(TAINT_MACHINE_CHECK);
 397                 cheetah_enable_pcache();
 398                 break;
 399
 400         default:
 401                 printk("Unknown boot switch (-%c)\n", c);
 402                 break;
 403         }
 404 }
 405
 406 static void __init process_console(char *commands)
 407 {
 408         serial_console = 0;
 409         commands += 8;
 410         /* Linux-style serial */
 411         if (!strncmp(commands, "ttyS", 4))
 412                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
 413         else if (!strncmp(commands, "tty", 3)) {
 414                 char c = *(commands + 3);
 415                 /* Solaris-style serial */
 416                 if (c == 'a' || c == 'b') {
 417                         serial_console = c - 'a' + 1;
 418                         prom_printf ("Using /dev/tty%c as console.\n", c);
 419                 }
 420                 /* else Linux-style fbcon, not serial */
 421         }
 422 #if defined(CONFIG_PROM_CONSOLE)
 423         if (!strncmp(commands, "prom", 4)) {
 424                 char *p;
 425
 426                 for (p = commands - 8; *p && *p != ' '; p++)
 427                         *p = ' ';
 428                 conswitchp = &prom_con;
 429         }
 430 #endif
 431 }
 432
 433 static void __init boot_flags_init(char *commands)
 434 {
 435         while (*commands) {
 436                 /* Move to the start of the next "argument". */
 437                 while (*commands && *commands == ' ')
 438                         commands++;
 439
 440                 /* Process any command switches, otherwise skip it. */
 441                 if (*commands == '\0')
 442                         break;
 443                 if (*commands == '-') {
 444                         commands++;
 445                         while (*commands && *commands != ' ')
 446                                 process_switch(*commands++);
 447                         continue;
 448                 }
 449                 if (!strncmp(commands, "console=", 8)) {
 450                         process_console(commands);
 451                 } else if (!strncmp(commands, "mem=", 4)) {
 452                         /*
 453                          * "mem=XXX[kKmM]" overrides the PROM-reported
 454                          * memory size.
 455                          */
 456                         cmdline_memory_size = simple_strtoul(commands + 4,
 457                                                              &commands, 0);
 458                         if (*commands == 'K' || *commands == 'k') {
 459                                 cmdline_memory_size <<= 10;
 460                                 commands++;
 461                         } else if (*commands=='M' || *commands=='m') {
 462                                 cmdline_memory_size <<= 20;
 463                                 commands++;
 464                         }
 465                 }
 466                 while (*commands && *commands != ' ')
 467                         commands++;
 468         }
 469 }
 470
 471 extern void panic_setup(char *, int *);
 472
 473 extern unsigned short root_flags;
 474 extern unsigned short root_dev;
 475 extern unsigned short ram_flags;
 476 #define RAMDISK_IMAGE_START_MASK        0x07FF
 477 #define RAMDISK_PROMPT_FLAG             0x8000
 478 #define RAMDISK_LOAD_FLAG               0x4000
 479
 480 extern int root_mountflags;
 481
 482 char reboot_command[COMMAND_LINE_SIZE];
 483
 484 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 485
 486 void register_prom_callbacks(void)
 487 {
 488         prom_setcallback(prom_callback);
 489         prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
 490                    "' linux-va>tte-data to va>tte-data");
 491         prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
 492                    "' linux-.soft1 to .soft1");
 493         prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
 494                    "' linux-.soft2 to .soft2");
 495 }
 496
 497 static void __init per_cpu_patch(void)
 498 {
 499 #ifdef CONFIG_SMP
 500         struct cpuid_patch_entry *p;
 501         unsigned long ver;
 502         int is_jbus;
 503
 504         if (tlb_type == spitfire && !this_is_starfire)
 505                 return;
 506
 507         is_jbus = 0;
 508         if (tlb_type != hypervisor) {
 509                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 510                 is_jbus = ((ver >> 32) == __JALAPENO_ID ||
 511                            (ver >> 32) == __SERRANO_ID);
 512         }
 513
 514         p = &__cpuid_patch;
 515         while (p < &__cpuid_patch_end) {
 516                 unsigned long addr = p->addr;
 517                 unsigned int *insns;
 518
 519                 switch (tlb_type) {
 520                 case spitfire:
 521                         insns = &p->starfire[0];
 522                         break;
 523                 case cheetah:
 524                 case cheetah_plus:
 525                         if (is_jbus)
 526                                 insns = &p->cheetah_jbus[0];
 527                         else
 528                                 insns = &p->cheetah_safari[0];
 529                         break;
 530                 case hypervisor:
 531                         insns = &p->sun4v[0];
 532                         break;
 533                 default:
 534                         prom_printf("Unknown cpu type, halting.\n");
 535                         prom_halt();
 536                 };
 537
 538                 *(unsigned int *) (addr +  0) = insns[0];
 539                 wmb();
 540                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 541
 542                 *(unsigned int *) (addr +  4) = insns[1];
 543                 wmb();
 544                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 545
 546                 *(unsigned int *) (addr +  8) = insns[2];
 547                 wmb();
 548                 __asm__ __volatile__("flush     %0" : : "r" (addr +  8));
 549
 550                 *(unsigned int *) (addr + 12) = insns[3];
 551                 wmb();
 552                 __asm__ __volatile__("flush     %0" : : "r" (addr + 12));
 553
 554                 p++;
 555         }
 556 #endif
 557 }
 558
 559 static void __init sun4v_patch(void)
 560 {
 561         struct sun4v_1insn_patch_entry *p1;
 562         struct sun4v_2insn_patch_entry *p2;
 563
 564         if (tlb_type != hypervisor)
 565                 return;
 566
 567         p1 = &__sun4v_1insn_patch;
 568         while (p1 < &__sun4v_1insn_patch_end) {
 569                 unsigned long addr = p1->addr;
 570
 571                 *(unsigned int *) (addr +  0) = p1->insn;
 572                 wmb();
 573                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 574
 575                 p1++;
 576         }
 577
 578         p2 = &__sun4v_2insn_patch;
 579         while (p2 < &__sun4v_2insn_patch_end) {
 580                 unsigned long addr = p2->addr;
 581
 582                 *(unsigned int *) (addr +  0) = p2->insns[0];
 583                 wmb();
 584                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 585
 586                 *(unsigned int *) (addr +  3) = p2->insns[1];
 587                 wmb();
 588                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 589
 590                 p2++;
 591         }
 592 }
 593
 594 void __init setup_arch(char **cmdline_p)
 595 {
 596         /* Initialize PROM console and command line. */
 597         *cmdline_p = prom_getbootargs();
 598         strcpy(saved_command_line, *cmdline_p);
 599
 600         printk("ARCH: SUN4U\n");
 601
 602 #ifdef CONFIG_DUMMY_CONSOLE
 603         conswitchp = &dummy_con;
 604 #elif defined(CONFIG_PROM_CONSOLE)
 605         conswitchp = &prom_con;
 606 #endif
 607
 608         /* Work out if we are starfire early on */
 609         check_if_starfire();
 610
 611         /* Now we know enough to patch the get_cpuid sequences
 612          * used by trap code.
 613          */
 614         per_cpu_patch();
 615
 616         sun4v_patch();
 617
 618         boot_flags_init(*cmdline_p);
 619
 620         idprom_init();
 621
 622         if (!root_flags)
 623                 root_mountflags &= ~MS_RDONLY;
 624         ROOT_DEV = old_decode_dev(root_dev);
 625 #ifdef CONFIG_BLK_DEV_INITRD
 626         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 627         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 628         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 629 #endif
 630
 631         task_thread_info(&init_task)->kregs = &fake_swapper_regs;
 632
 633 #ifdef CONFIG_IP_PNP
 634         if (!ic_set_manually) {
 635                 int chosen = prom_finddevice ("/chosen");
 636                 u32 cl, sv, gw;
 637
 638                 cl = prom_getintdefault (chosen, "client-ip", 0);
 639                 sv = prom_getintdefault (chosen, "server-ip", 0);
 640                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
 641                 if (cl && sv) {
 642                         ic_myaddr = cl;
 643                         ic_servaddr = sv;
 644                         if (gw)
 645                                 ic_gateway = gw;
 646 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 647                         ic_proto_enabled = 0;
 648 #endif
 649                 }
 650         }
 651 #endif
 652
 653         smp_setup_cpu_possible_map();
 654
 655         paging_init();
 656
 657         /* Get boot processor trap_block[] setup.  */
 658         init_cur_cpu_trap();
 659 }
 660
 661 static int __init set_preferred_console(void)
 662 {
 663         int idev, odev;
 664
 665         /* The user has requested a console so this is already set up. */
 666         if (serial_console >= 0)
 667                 return -EBUSY;
 668
 669         idev = prom_query_input_device();
 670         odev = prom_query_output_device();
 671         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 672                 serial_console = 0;
 673         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 674                 serial_console = 1;
 675         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 676                 serial_console = 2;
 677         } else if (idev == PROMDEV_IRSC && odev == PROMDEV_ORSC) {
 678                 serial_console = 3;
 679         } else {
 680                 prom_printf("Inconsistent console: "
 681                             "input %d, output %d\n",
 682                             idev, odev);
 683                 prom_halt();
 684         }
 685
 686         if (serial_console)
 687                 return add_preferred_console("ttyS", serial_console - 1, NULL);
 688
 689         return -ENODEV;
 690 }
 691 console_initcall(set_preferred_console);
 692
 693 /* BUFFER is PAGE_SIZE bytes long. */
 694
 695 extern char *sparc_cpu_type;
 696 extern char *sparc_fpu_type;
 697
 698 extern void smp_info(struct seq_file *);
 699 extern void smp_bogo(struct seq_file *);
 700 extern void mmu_info(struct seq_file *);
 701
 702 unsigned int dcache_parity_tl1_occurred;
 703 unsigned int icache_parity_tl1_occurred;
 704
 705 static int ncpus_probed;
 706
 707 static int show_cpuinfo(struct seq_file *m, void *__unused)
 708 {
 709         seq_printf(m,
 710                    "cpu\t\t: %s\n"
 711                    "fpu\t\t: %s\n"
 712                    "promlib\t\t: Version 3 Revision %d\n"
 713                    "prom\t\t: %d.%d.%d\n"
 714                    "type\t\t: sun4u\n"
 715                    "ncpus probed\t: %d\n"
 716                    "ncpus active\t: %d\n"
 717                    "D$ parity tl1\t: %u\n"
 718                    "I$ parity tl1\t: %u\n"
 719 #ifndef CONFIG_SMP
 720                    "Cpu0Bogo\t: %lu.%02lu\n"
 721                    "Cpu0ClkTck\t: %016lx\n"
 722 #endif
 723                    ,
 724                    sparc_cpu_type,
 725                    sparc_fpu_type,
 726                    prom_rev,
 727                    prom_prev >> 16,
 728                    (prom_prev >> 8) & 0xff,
 729                    prom_prev & 0xff,
 730                    ncpus_probed,
 731                    num_online_cpus(),
 732                    dcache_parity_tl1_occurred,
 733                    icache_parity_tl1_occurred
 734 #ifndef CONFIG_SMP
 735                    , cpu_data(0).udelay_val/(500000/HZ),
 736                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 737                    cpu_data(0).clock_tick
 738 #endif
 739                 );
 740 #ifdef CONFIG_SMP
 741         smp_bogo(m);
 742 #endif
 743         mmu_info(m);
 744 #ifdef CONFIG_SMP
 745         smp_info(m);
 746 #endif
 747         return 0;
 748 }
 749
 750 static void *c_start(struct seq_file *m, loff_t *pos)
 751 {
 752         /* The pointer we are returning is arbitrary,
 753          * it just has to be non-NULL and not IS_ERR
 754          * in the success case.
 755          */
 756         return *pos == 0 ? &c_start : NULL;
 757 }
 758
 759 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 760 {
 761         ++*pos;
 762         return c_start(m, pos);
 763 }
 764
 765 static void c_stop(struct seq_file *m, void *v)
 766 {
 767 }
 768
 769 struct seq_operations cpuinfo_op = {
 770         .start =c_start,
 771         .next = c_next,
 772         .stop = c_stop,
 773         .show = show_cpuinfo,
 774 };
 775
 776 extern int stop_a_enabled;
 777
 778 void sun_do_break(void)
 779 {
 780         if (!stop_a_enabled)
 781                 return;
 782
 783         prom_printf("\n");
 784         flush_user_windows();
 785
 786         prom_cmdline();
 787 }
 788
 789 int serial_console = -1;
 790 int stop_a_enabled = 1;
 791
 792 static int __init topology_init(void)
 793 {
 794         int i, err;
 795
 796         err = -ENOMEM;
 797
 798         /* Count the number of physically present processors in
 799          * the machine, even on uniprocessor, so that /proc/cpuinfo
 800          * output is consistent with 2.4.x
 801          */
 802         ncpus_probed = 0;
 803         while (!cpu_find_by_instance(ncpus_probed, NULL, NULL))
 804                 ncpus_probed++;
 805
 806         for (i = 0; i < NR_CPUS; i++) {
 807                 if (cpu_possible(i)) {
 808                         struct cpu *p = kmalloc(sizeof(*p), GFP_KERNEL);
 809
 810                         if (p) {
 811                                 memset(p, 0, sizeof(*p));
 812                                 register_cpu(p, i, NULL);
 813                                 err = 0;
 814                         }
 815                 }
 816         }
 817
 818         return err;
 819 }
 820
 821 subsys_initcall(topology_init);