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   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
 158                         for_each_process(p) {
 159                                 mm = p->mm;
 160                                 if (CTX_NRBITS(mm->context) == ctx)
 161                                         break;
 162                         }
 163                         if (!mm ||
 164                             CTX_NRBITS(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                         extern unsigned long sparc64_kern_pri_context;
 191
 192                         /* Spitfire Errata #32 workaround */
 193                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
 194                                              "flush     %%g6"
 195                                              : /* No outputs */
 196                                              : "r" (sparc64_kern_pri_context),
 197                                                "r" (PRIMARY_CONTEXT),
 198                                                "i" (ASI_DMMU));
 199
 200                         /*
 201                          * Locked down tlb entry.
 202                          */
 203
 204                         if (tlb_type == spitfire)
 205                                 tte = spitfire_get_dtlb_data(SPITFIRE_HIGHEST_LOCKED_TLBENT);
 206                         else if (tlb_type == cheetah || tlb_type == cheetah_plus)
 207                                 tte = cheetah_get_ldtlb_data(CHEETAH_HIGHEST_LOCKED_TLBENT);
 208
 209                         res = PROM_TRUE;
 210                         goto done;
 211                 }
 212
 213                 if (va < PGDIR_SIZE) {
 214                         /*
 215                          * vmalloc or prom_inherited mapping.
 216                          */
 217                         pgd_t *pgdp;
 218                         pud_t *pudp;
 219                         pmd_t *pmdp;
 220                         pte_t *ptep;
 221                         int error;
 222
 223                         if ((va >= LOW_OBP_ADDRESS) && (va < HI_OBP_ADDRESS)) {
 224                                 tte = prom_virt_to_phys(va, &error);
 225                                 if (!error)
 226                                         res = PROM_TRUE;
 227                                 goto done;
 228                         }
 229                         pgdp = pgd_offset_k(va);
 230                         if (pgd_none(*pgdp))
 231                                 goto done;
 232                         pudp = pud_offset(pgdp, va);
 233                         if (pud_none(*pudp))
 234                                 goto done;
 235                         pmdp = pmd_offset(pudp, va);
 236                         if (pmd_none(*pmdp))
 237                                 goto done;
 238
 239                         /* Preemption implicitly disabled by virtue of
 240                          * being called from inside OBP.
 241                          */
 242                         ptep = pte_offset_kernel(pmdp, va);
 243                         if (pte_present(*ptep)) {
 244                                 tte = pte_val(*ptep);
 245                                 res = PROM_TRUE;
 246                         }
 247                         goto done;
 248                 }
 249
 250                 if (va < PAGE_OFFSET) {
 251                         /*
 252                          * No mappings here.
 253                          */
 254                         goto done;
 255                 }
 256
 257                 if (va & (1UL << 40)) {
 258                         /*
 259                          * I/O page.
 260                          */
 261
 262                         tte = (__pa(va) & _PAGE_PADDR) |
 263                               _PAGE_VALID | _PAGE_SZ4MB |
 264                               _PAGE_E | _PAGE_P | _PAGE_W;
 265                         res = PROM_TRUE;
 266                         goto done;
 267                 }
 268
 269                 /*
 270                  * Normal page.
 271                  */
 272                 tte = (__pa(va) & _PAGE_PADDR) |
 273                       _PAGE_VALID | _PAGE_SZ4MB |
 274                       _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W;
 275                 res = PROM_TRUE;
 276
 277         done:
 278                 if (res == PROM_TRUE) {
 279                         args[2] = 3;
 280                         args[args[1] + 3] = 0;
 281                         args[args[1] + 4] = res;
 282                         args[args[1] + 5] = tte;
 283                 } else {
 284                         args[2] = 2;
 285                         args[args[1] + 3] = 0;
 286                         args[args[1] + 4] = res;
 287                 }
 288         } else if (!strcmp(cmd, ".soft1")) {
 289                 unsigned long tte;
 290
 291                 tte = args[3];
 292                 prom_printf("%lx:\"%s%s%s%s%s\" ",
 293                             (tte & _PAGE_SOFT) >> 7,
 294                             tte & _PAGE_MODIFIED ? "M" : "-",
 295                             tte & _PAGE_ACCESSED ? "A" : "-",
 296                             tte & _PAGE_READ     ? "W" : "-",
 297                             tte & _PAGE_WRITE    ? "R" : "-",
 298                             tte & _PAGE_PRESENT  ? "P" : "-");
 299
 300                 args[2] = 2;
 301                 args[args[1] + 3] = 0;
 302                 args[args[1] + 4] = PROM_TRUE;
 303         } else if (!strcmp(cmd, ".soft2")) {
 304                 unsigned long tte;
 305
 306                 tte = args[3];
 307                 prom_printf("%lx ", (tte & 0x07FC000000000000UL) >> 50);
 308
 309                 args[2] = 2;
 310                 args[args[1] + 3] = 0;
 311                 args[args[1] + 4] = PROM_TRUE;
 312         } else {
 313                 prom_printf("unknown PROM `%s' command...\n", cmd);
 314         }
 315         unregister_console(&prom_console);
 316         while (saved_console) {
 317                 cons = saved_console;
 318                 saved_console = cons->next;
 319                 register_console(cons);
 320         }
 321         spin_lock(&prom_entry_lock);
 322         local_irq_restore(flags);
 323
 324         /*
 325          * Restore in-interrupt status for a resume from obp.
 326          */
 327         irq_enter();
 328         return 0;
 329 }
 330
 331 unsigned int boot_flags = 0;
 332 #define BOOTME_DEBUG  0x1
 333 #define BOOTME_SINGLE 0x2
 334
 335 /* Exported for mm/init.c:paging_init. */
 336 unsigned long cmdline_memory_size = 0;
 337
 338 static struct console prom_debug_console = {
 339         .name =         "debug",
 340         .write =        prom_console_write,
 341         .flags =        CON_PRINTBUFFER,
 342         .index =        -1,
 343 };
 344
 345 /* XXX Implement this at some point... */
 346 void kernel_enter_debugger(void)
 347 {
 348 }
 349
 350 int obp_system_intr(void)
 351 {
 352         if (boot_flags & BOOTME_DEBUG) {
 353                 printk("OBP: system interrupted\n");
 354                 prom_halt();
 355                 return 1;
 356         }
 357         return 0;
 358 }
 359
 360 /*
 361  * Process kernel command line switches that are specific to the
 362  * SPARC or that require special low-level processing.
 363  */
 364 static void __init process_switch(char c)
 365 {
 366         switch (c) {
 367         case 'd':
 368                 boot_flags |= BOOTME_DEBUG;
 369                 break;
 370         case 's':
 371                 boot_flags |= BOOTME_SINGLE;
 372                 break;
 373         case 'h':
 374                 prom_printf("boot_flags_init: Halt!\n");
 375                 prom_halt();
 376                 break;
 377         case 'p':
 378                 /* Use PROM debug console. */
 379                 register_console(&prom_debug_console);
 380                 break;
 381         case 'P':
 382                 /* Force UltraSPARC-III P-Cache on. */
 383                 if (tlb_type != cheetah) {
 384                         printk("BOOT: Ignoring P-Cache force option.\n");
 385                         break;
 386                 }
 387                 cheetah_pcache_forced_on = 1;
 388                 add_taint(TAINT_MACHINE_CHECK);
 389                 cheetah_enable_pcache();
 390                 break;
 391
 392         default:
 393                 printk("Unknown boot switch (-%c)\n", c);
 394                 break;
 395         }
 396 }
 397
 398 static void __init process_console(char *commands)
 399 {
 400         serial_console = 0;
 401         commands += 8;
 402         /* Linux-style serial */
 403         if (!strncmp(commands, "ttyS", 4))
 404                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
 405         else if (!strncmp(commands, "tty", 3)) {
 406                 char c = *(commands + 3);
 407                 /* Solaris-style serial */
 408                 if (c == 'a' || c == 'b') {
 409                         serial_console = c - 'a' + 1;
 410                         prom_printf ("Using /dev/tty%c as console.\n", c);
 411                 }
 412                 /* else Linux-style fbcon, not serial */
 413         }
 414 #if defined(CONFIG_PROM_CONSOLE)
 415         if (!strncmp(commands, "prom", 4)) {
 416                 char *p;
 417
 418                 for (p = commands - 8; *p && *p != ' '; p++)
 419                         *p = ' ';
 420                 conswitchp = &prom_con;
 421         }
 422 #endif
 423 }
 424
 425 static void __init boot_flags_init(char *commands)
 426 {
 427         while (*commands) {
 428                 /* Move to the start of the next "argument". */
 429                 while (*commands && *commands == ' ')
 430                         commands++;
 431
 432                 /* Process any command switches, otherwise skip it. */
 433                 if (*commands == '\0')
 434                         break;
 435                 if (*commands == '-') {
 436                         commands++;
 437                         while (*commands && *commands != ' ')
 438                                 process_switch(*commands++);
 439                         continue;
 440                 }
 441                 if (!strncmp(commands, "console=", 8)) {
 442                         process_console(commands);
 443                 } else if (!strncmp(commands, "mem=", 4)) {
 444                         /*
 445                          * "mem=XXX[kKmM]" overrides the PROM-reported
 446                          * memory size.
 447                          */
 448                         cmdline_memory_size = simple_strtoul(commands + 4,
 449                                                              &commands, 0);
 450                         if (*commands == 'K' || *commands == 'k') {
 451                                 cmdline_memory_size <<= 10;
 452                                 commands++;
 453                         } else if (*commands=='M' || *commands=='m') {
 454                                 cmdline_memory_size <<= 20;
 455                                 commands++;
 456                         }
 457                 }
 458                 while (*commands && *commands != ' ')
 459                         commands++;
 460         }
 461 }
 462
 463 extern void panic_setup(char *, int *);
 464
 465 extern unsigned short root_flags;
 466 extern unsigned short root_dev;
 467 extern unsigned short ram_flags;
 468 #define RAMDISK_IMAGE_START_MASK        0x07FF
 469 #define RAMDISK_PROMPT_FLAG             0x8000
 470 #define RAMDISK_LOAD_FLAG               0x4000
 471
 472 extern int root_mountflags;
 473
 474 char reboot_command[COMMAND_LINE_SIZE];
 475
 476 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 477
 478 void register_prom_callbacks(void)
 479 {
 480         prom_setcallback(prom_callback);
 481         prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
 482                    "' linux-va>tte-data to va>tte-data");
 483         prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
 484                    "' linux-.soft1 to .soft1");
 485         prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
 486                    "' linux-.soft2 to .soft2");
 487 }
 488
 489 void __init setup_arch(char **cmdline_p)
 490 {
 491         /* Initialize PROM console and command line. */
 492         *cmdline_p = prom_getbootargs();
 493         strcpy(saved_command_line, *cmdline_p);
 494
 495         printk("ARCH: SUN4U\n");
 496
 497 #ifdef CONFIG_DUMMY_CONSOLE
 498         conswitchp = &dummy_con;
 499 #elif defined(CONFIG_PROM_CONSOLE)
 500         conswitchp = &prom_con;
 501 #endif
 502
 503         /* Work out if we are starfire early on */
 504         check_if_starfire();
 505
 506         boot_flags_init(*cmdline_p);
 507
 508         idprom_init();
 509
 510         if (!root_flags)
 511                 root_mountflags &= ~MS_RDONLY;
 512         ROOT_DEV = old_decode_dev(root_dev);
 513 #ifdef CONFIG_BLK_DEV_INITRD
 514         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 515         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 516         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 517 #endif
 518
 519         init_task.thread_info->kregs = &fake_swapper_regs;
 520
 521 #ifdef CONFIG_IP_PNP
 522         if (!ic_set_manually) {
 523                 int chosen = prom_finddevice ("/chosen");
 524                 u32 cl, sv, gw;
 525
 526                 cl = prom_getintdefault (chosen, "client-ip", 0);
 527                 sv = prom_getintdefault (chosen, "server-ip", 0);
 528                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
 529                 if (cl && sv) {
 530                         ic_myaddr = cl;
 531                         ic_servaddr = sv;
 532                         if (gw)
 533                                 ic_gateway = gw;
 534 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 535                         ic_proto_enabled = 0;
 536 #endif
 537                 }
 538         }
 539 #endif
 540
 541         paging_init();
 542 }
 543
 544 static int __init set_preferred_console(void)
 545 {
 546         int idev, odev;
 547
 548         /* The user has requested a console so this is already set up. */
 549         if (serial_console >= 0)
 550                 return -EBUSY;
 551
 552         idev = prom_query_input_device();
 553         odev = prom_query_output_device();
 554         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 555                 serial_console = 0;
 556         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 557                 serial_console = 1;
 558         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 559                 serial_console = 2;
 560         } else {
 561                 prom_printf("Inconsistent console: "
 562                             "input %d, output %d\n",
 563                             idev, odev);
 564                 prom_halt();
 565         }
 566
 567         if (serial_console)
 568                 return add_preferred_console("ttyS", serial_console - 1, NULL);
 569
 570         return -ENODEV;
 571 }
 572 console_initcall(set_preferred_console);
 573
 574 /* BUFFER is PAGE_SIZE bytes long. */
 575
 576 extern char *sparc_cpu_type;
 577 extern char *sparc_fpu_type;
 578
 579 extern void smp_info(struct seq_file *);
 580 extern void smp_bogo(struct seq_file *);
 581 extern void mmu_info(struct seq_file *);
 582
 583 unsigned int dcache_parity_tl1_occurred;
 584 unsigned int icache_parity_tl1_occurred;
 585
 586 static int show_cpuinfo(struct seq_file *m, void *__unused)
 587 {
 588         seq_printf(m,
 589                    "cpu\t\t: %s\n"
 590                    "fpu\t\t: %s\n"
 591                    "promlib\t\t: Version 3 Revision %d\n"
 592                    "prom\t\t: %d.%d.%d\n"
 593                    "type\t\t: sun4u\n"
 594                    "ncpus probed\t: %ld\n"
 595                    "ncpus active\t: %ld\n"
 596                    "D$ parity tl1\t: %u\n"
 597                    "I$ parity tl1\t: %u\n"
 598 #ifndef CONFIG_SMP
 599                    "Cpu0Bogo\t: %lu.%02lu\n"
 600                    "Cpu0ClkTck\t: %016lx\n"
 601 #endif
 602                    ,
 603                    sparc_cpu_type,
 604                    sparc_fpu_type,
 605                    prom_rev,
 606                    prom_prev >> 16,
 607                    (prom_prev >> 8) & 0xff,
 608                    prom_prev & 0xff,
 609                    (long)num_possible_cpus(),
 610                    (long)num_online_cpus(),
 611                    dcache_parity_tl1_occurred,
 612                    icache_parity_tl1_occurred
 613 #ifndef CONFIG_SMP
 614                    , cpu_data(0).udelay_val/(500000/HZ),
 615                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 616                    cpu_data(0).clock_tick
 617 #endif
 618                 );
 619 #ifdef CONFIG_SMP
 620         smp_bogo(m);
 621 #endif
 622         mmu_info(m);
 623 #ifdef CONFIG_SMP
 624         smp_info(m);
 625 #endif
 626         return 0;
 627 }
 628
 629 static void *c_start(struct seq_file *m, loff_t *pos)
 630 {
 631         /* The pointer we are returning is arbitrary,
 632          * it just has to be non-NULL and not IS_ERR
 633          * in the success case.
 634          */
 635         return *pos == 0 ? &c_start : NULL;
 636 }
 637
 638 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 639 {
 640         ++*pos;
 641         return c_start(m, pos);
 642 }
 643
 644 static void c_stop(struct seq_file *m, void *v)
 645 {
 646 }
 647
 648 struct seq_operations cpuinfo_op = {
 649         .start =c_start,
 650         .next = c_next,
 651         .stop = c_stop,
 652         .show = show_cpuinfo,
 653 };
 654
 655 extern int stop_a_enabled;
 656
 657 void sun_do_break(void)
 658 {
 659         if (!stop_a_enabled)
 660                 return;
 661
 662         prom_printf("\n");
 663         flush_user_windows();
 664
 665         prom_cmdline();
 666 }
 667
 668 int serial_console = -1;
 669 int stop_a_enabled = 1;
 670
 671 static int __init topology_init(void)
 672 {
 673         int i, err;
 674
 675         err = -ENOMEM;
 676         for (i = 0; i < NR_CPUS; i++) {
 677                 if (cpu_possible(i)) {
 678                         struct cpu *p = kmalloc(sizeof(*p), GFP_KERNEL);
 679
 680                         if (p) {
 681                                 memset(p, 0, sizeof(*p));
 682                                 register_cpu(p, i, NULL);
 683                                 err = 0;
 684                         }
 685                 }
 686         }
 687
 688         return err;
 689 }
 690
 691 subsys_initcall(topology_init);