arch/sparc/kernel/prom_64.c

   1 /*
   2  * Procedures for creating, accessing and interpreting the device tree.
   3  *
   4  * Paul Mackerras       August 1996.
   5  * Copyright (C) 1996-2005 Paul Mackerras.
   6  *
   7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   8  *    {engebret|bergner}@us.ibm.com
   9  *
  10  *  Adapted for sparc64 by David S. Miller davem@davemloft.net
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/module.h>
  23 #include <linux/lmb.h>
  24 #include <linux/of_device.h>
  25
  26 #include <asm/prom.h>
  27 #include <asm/oplib.h>
  28 #include <asm/irq.h>
  29 #include <asm/asi.h>
  30 #include <asm/upa.h>
  31 #include <asm/smp.h>
  32
  33 #include "prom.h"
  34
  35 static unsigned int prom_early_allocated __initdata;
  36
  37 void * __init prom_early_alloc(unsigned long size)
  38 {
  39         unsigned long paddr = lmb_alloc(size, SMP_CACHE_BYTES);
  40         void *ret;
  41
  42         if (!paddr) {
  43                 prom_printf("prom_early_alloc(%lu) failed\n");
  44                 prom_halt();
  45         }
  46
  47         ret = __va(paddr);
  48         memset(ret, 0, size);
  49         prom_early_allocated += size;
  50
  51         return ret;
  52 }
  53
  54 static int is_root_node(const struct device_node *dp)
  55 {
  56         if (!dp)
  57                 return 0;
  58
  59         return (dp->parent == NULL);
  60 }
  61
  62 /* The following routines deal with the black magic of fully naming a
  63  * node.
  64  *
  65  * Certain well known named nodes are just the simple name string.
  66  *
  67  * Actual devices have an address specifier appended to the base name
  68  * string, like this "foo@addr".  The "addr" can be in any number of
  69  * formats, and the platform plus the type of the node determine the
  70  * format and how it is constructed.
  71  *
  72  * For children of the ROOT node, the naming convention is fixed and
  73  * determined by whether this is a sun4u or sun4v system.
  74  *
  75  * For children of other nodes, it is bus type specific.  So
  76  * we walk up the tree until we discover a "device_type" property
  77  * we recognize and we go from there.
  78  *
  79  * As an example, the boot device on my workstation has a full path:
  80  *
  81  *      /pci@1e,600000/ide@d/disk@0,0:c
  82  */
  83 static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
  84 {
  85         struct linux_prom64_registers *regs;
  86         struct property *rprop;
  87         u32 high_bits, low_bits, type;
  88
  89         rprop = of_find_property(dp, "reg", NULL);
  90         if (!rprop)
  91                 return;
  92
  93         regs = rprop->value;
  94         if (!is_root_node(dp->parent)) {
  95                 sprintf(tmp_buf, "%s@%x,%x",
  96                         dp->name,
  97                         (unsigned int) (regs->phys_addr >> 32UL),
  98                         (unsigned int) (regs->phys_addr & 0xffffffffUL));
  99                 return;
 100         }
 101
 102         type = regs->phys_addr >> 60UL;
 103         high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
 104         low_bits = (regs->phys_addr & 0xffffffffUL);
 105
 106         if (type == 0 || type == 8) {
 107                 const char *prefix = (type == 0) ? "m" : "i";
 108
 109                 if (low_bits)
 110                         sprintf(tmp_buf, "%s@%s%x,%x",
 111                                 dp->name, prefix,
 112                                 high_bits, low_bits);
 113                 else
 114                         sprintf(tmp_buf, "%s@%s%x",
 115                                 dp->name,
 116                                 prefix,
 117                                 high_bits);
 118         } else if (type == 12) {
 119                 sprintf(tmp_buf, "%s@%x",
 120                         dp->name, high_bits);
 121         }
 122 }
 123
 124 static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 125 {
 126         struct linux_prom64_registers *regs;
 127         struct property *prop;
 128
 129         prop = of_find_property(dp, "reg", NULL);
 130         if (!prop)
 131                 return;
 132
 133         regs = prop->value;
 134         if (!is_root_node(dp->parent)) {
 135                 sprintf(tmp_buf, "%s@%x,%x",
 136                         dp->name,
 137                         (unsigned int) (regs->phys_addr >> 32UL),
 138                         (unsigned int) (regs->phys_addr & 0xffffffffUL));
 139                 return;
 140         }
 141
 142         prop = of_find_property(dp, "upa-portid", NULL);
 143         if (!prop)
 144                 prop = of_find_property(dp, "portid", NULL);
 145         if (prop) {
 146                 unsigned long mask = 0xffffffffUL;
 147
 148                 if (tlb_type >= cheetah)
 149                         mask = 0x7fffff;
 150
 151                 sprintf(tmp_buf, "%s@%x,%x",
 152                         dp->name,
 153                         *(u32 *)prop->value,
 154                         (unsigned int) (regs->phys_addr & mask));
 155         }
 156 }
 157
 158 /* "name@slot,offset"  */
 159 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 160 {
 161         struct linux_prom_registers *regs;
 162         struct property *prop;
 163
 164         prop = of_find_property(dp, "reg", NULL);
 165         if (!prop)
 166                 return;
 167
 168         regs = prop->value;
 169         sprintf(tmp_buf, "%s@%x,%x",
 170                 dp->name,
 171                 regs->which_io,
 172                 regs->phys_addr);
 173 }
 174
 175 /* "name@devnum[,func]" */
 176 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 177 {
 178         struct linux_prom_pci_registers *regs;
 179         struct property *prop;
 180         unsigned int devfn;
 181
 182         prop = of_find_property(dp, "reg", NULL);
 183         if (!prop)
 184                 return;
 185
 186         regs = prop->value;
 187         devfn = (regs->phys_hi >> 8) & 0xff;
 188         if (devfn & 0x07) {
 189                 sprintf(tmp_buf, "%s@%x,%x",
 190                         dp->name,
 191                         devfn >> 3,
 192                         devfn & 0x07);
 193         } else {
 194                 sprintf(tmp_buf, "%s@%x",
 195                         dp->name,
 196                         devfn >> 3);
 197         }
 198 }
 199
 200 /* "name@UPA_PORTID,offset" */
 201 static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
 202 {
 203         struct linux_prom64_registers *regs;
 204         struct property *prop;
 205
 206         prop = of_find_property(dp, "reg", NULL);
 207         if (!prop)
 208                 return;
 209
 210         regs = prop->value;
 211
 212         prop = of_find_property(dp, "upa-portid", NULL);
 213         if (!prop)
 214                 return;
 215
 216         sprintf(tmp_buf, "%s@%x,%x",
 217                 dp->name,
 218                 *(u32 *) prop->value,
 219                 (unsigned int) (regs->phys_addr & 0xffffffffUL));
 220 }
 221
 222 /* "name@reg" */
 223 static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
 224 {
 225         struct property *prop;
 226         u32 *regs;
 227
 228         prop = of_find_property(dp, "reg", NULL);
 229         if (!prop)
 230                 return;
 231
 232         regs = prop->value;
 233
 234         sprintf(tmp_buf, "%s@%x", dp->name, *regs);
 235 }
 236
 237 /* "name@addrhi,addrlo" */
 238 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 239 {
 240         struct linux_prom64_registers *regs;
 241         struct property *prop;
 242
 243         prop = of_find_property(dp, "reg", NULL);
 244         if (!prop)
 245                 return;
 246
 247         regs = prop->value;
 248
 249         sprintf(tmp_buf, "%s@%x,%x",
 250                 dp->name,
 251                 (unsigned int) (regs->phys_addr >> 32UL),
 252                 (unsigned int) (regs->phys_addr & 0xffffffffUL));
 253 }
 254
 255 /* "name@bus,addr" */
 256 static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
 257 {
 258         struct property *prop;
 259         u32 *regs;
 260
 261         prop = of_find_property(dp, "reg", NULL);
 262         if (!prop)
 263                 return;
 264
 265         regs = prop->value;
 266
 267         /* This actually isn't right... should look at the #address-cells
 268          * property of the i2c bus node etc. etc.
 269          */
 270         sprintf(tmp_buf, "%s@%x,%x",
 271                 dp->name, regs[0], regs[1]);
 272 }
 273
 274 /* "name@reg0[,reg1]" */
 275 static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
 276 {
 277         struct property *prop;
 278         u32 *regs;
 279
 280         prop = of_find_property(dp, "reg", NULL);
 281         if (!prop)
 282                 return;
 283
 284         regs = prop->value;
 285
 286         if (prop->length == sizeof(u32) || regs[1] == 1) {
 287                 sprintf(tmp_buf, "%s@%x",
 288                         dp->name, regs[0]);
 289         } else {
 290                 sprintf(tmp_buf, "%s@%x,%x",
 291                         dp->name, regs[0], regs[1]);
 292         }
 293 }
 294
 295 /* "name@reg0reg1[,reg2reg3]" */
 296 static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
 297 {
 298         struct property *prop;
 299         u32 *regs;
 300
 301         prop = of_find_property(dp, "reg", NULL);
 302         if (!prop)
 303                 return;
 304
 305         regs = prop->value;
 306
 307         if (regs[2] || regs[3]) {
 308                 sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
 309                         dp->name, regs[0], regs[1], regs[2], regs[3]);
 310         } else {
 311                 sprintf(tmp_buf, "%s@%08x%08x",
 312                         dp->name, regs[0], regs[1]);
 313         }
 314 }
 315
 316 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 317 {
 318         struct device_node *parent = dp->parent;
 319
 320         if (parent != NULL) {
 321                 if (!strcmp(parent->type, "pci") ||
 322                     !strcmp(parent->type, "pciex")) {
 323                         pci_path_component(dp, tmp_buf);
 324                         return;
 325                 }
 326                 if (!strcmp(parent->type, "sbus")) {
 327                         sbus_path_component(dp, tmp_buf);
 328                         return;
 329                 }
 330                 if (!strcmp(parent->type, "upa")) {
 331                         upa_path_component(dp, tmp_buf);
 332                         return;
 333                 }
 334                 if (!strcmp(parent->type, "ebus")) {
 335                         ebus_path_component(dp, tmp_buf);
 336                         return;
 337                 }
 338                 if (!strcmp(parent->name, "usb") ||
 339                     !strcmp(parent->name, "hub")) {
 340                         usb_path_component(dp, tmp_buf);
 341                         return;
 342                 }
 343                 if (!strcmp(parent->type, "i2c")) {
 344                         i2c_path_component(dp, tmp_buf);
 345                         return;
 346                 }
 347                 if (!strcmp(parent->type, "firewire")) {
 348                         ieee1394_path_component(dp, tmp_buf);
 349                         return;
 350                 }
 351                 if (!strcmp(parent->type, "virtual-devices")) {
 352                         vdev_path_component(dp, tmp_buf);
 353                         return;
 354                 }
 355                 /* "isa" is handled with platform naming */
 356         }
 357
 358         /* Use platform naming convention.  */
 359         if (tlb_type == hypervisor) {
 360                 sun4v_path_component(dp, tmp_buf);
 361                 return;
 362         } else {
 363                 sun4u_path_component(dp, tmp_buf);
 364         }
 365 }
 366
 367 static char * __init build_path_component(struct device_node *dp)
 368 {
 369         char tmp_buf[64], *n;
 370
 371         tmp_buf[0] = '\0';
 372         __build_path_component(dp, tmp_buf);
 373         if (tmp_buf[0] == '\0')
 374                 strcpy(tmp_buf, dp->name);
 375
 376         n = prom_early_alloc(strlen(tmp_buf) + 1);
 377         strcpy(n, tmp_buf);
 378
 379         return n;
 380 }
 381
 382 static char * __init build_full_name(struct device_node *dp)
 383 {
 384         int len, ourlen, plen;
 385         char *n;
 386
 387         plen = strlen(dp->parent->full_name);
 388         ourlen = strlen(dp->path_component_name);
 389         len = ourlen + plen + 2;
 390
 391         n = prom_early_alloc(len);
 392         strcpy(n, dp->parent->full_name);
 393         if (!is_root_node(dp->parent)) {
 394                 strcpy(n + plen, "/");
 395                 plen++;
 396         }
 397         strcpy(n + plen, dp->path_component_name);
 398
 399         return n;
 400 }
 401
 402 static struct property * __init build_one_prop(phandle node, char *prev, char *special_name, void *special_val, int special_len)
 403 {
 404         static struct property *tmp = NULL;
 405         struct property *p;
 406
 407         if (tmp) {
 408                 p = tmp;
 409                 memset(p, 0, sizeof(*p) + 32);
 410                 tmp = NULL;
 411         } else {
 412                 p = prom_early_alloc(sizeof(struct property) + 32);
 413                 p->unique_id = prom_unique_id++;
 414         }
 415
 416         p->name = (char *) (p + 1);
 417         if (special_name) {
 418                 strcpy(p->name, special_name);
 419                 p->length = special_len;
 420                 p->value = prom_early_alloc(special_len);
 421                 memcpy(p->value, special_val, special_len);
 422         } else {
 423                 if (prev == NULL) {
 424                         prom_firstprop(node, p->name);
 425                 } else {
 426                         prom_nextprop(node, prev, p->name);
 427                 }
 428                 if (strlen(p->name) == 0) {
 429                         tmp = p;
 430                         return NULL;
 431                 }
 432                 p->length = prom_getproplen(node, p->name);
 433                 if (p->length <= 0) {
 434                         p->length = 0;
 435                 } else {
 436                         p->value = prom_early_alloc(p->length + 1);
 437                         prom_getproperty(node, p->name, p->value, p->length);
 438                         ((unsigned char *)p->value)[p->length] = '\0';
 439                 }
 440         }
 441         return p;
 442 }
 443
 444 static struct property * __init build_prop_list(phandle node)
 445 {
 446         struct property *head, *tail;
 447
 448         head = tail = build_one_prop(node, NULL,
 449                                      ".node", &node, sizeof(node));
 450
 451         tail->next = build_one_prop(node, NULL, NULL, NULL, 0);
 452         tail = tail->next;
 453         while(tail) {
 454                 tail->next = build_one_prop(node, tail->name,
 455                                             NULL, NULL, 0);
 456                 tail = tail->next;
 457         }
 458
 459         return head;
 460 }
 461
 462 static char * __init get_one_property(phandle node, const char *name)
 463 {
 464         char *buf = "<NULL>";
 465         int len;
 466
 467         len = prom_getproplen(node, name);
 468         if (len > 0) {
 469                 buf = prom_early_alloc(len);
 470                 prom_getproperty(node, name, buf, len);
 471         }
 472
 473         return buf;
 474 }
 475
 476 static struct device_node * __init create_node(phandle node, struct device_node *parent)
 477 {
 478         struct device_node *dp;
 479
 480         if (!node)
 481                 return NULL;
 482
 483         dp = prom_early_alloc(sizeof(*dp));
 484         dp->unique_id = prom_unique_id++;
 485         dp->parent = parent;
 486
 487         kref_init(&dp->kref);
 488
 489         dp->name = get_one_property(node, "name");
 490         dp->type = get_one_property(node, "device_type");
 491         dp->node = node;
 492
 493         dp->properties = build_prop_list(node);
 494
 495         irq_trans_init(dp);
 496
 497         return dp;
 498 }
 499
 500 static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
 501 {
 502         struct device_node *ret = NULL, *prev_sibling = NULL;
 503         struct device_node *dp;
 504
 505         while (1) {
 506                 dp = create_node(node, parent);
 507                 if (!dp)
 508                         break;
 509
 510                 if (prev_sibling)
 511                         prev_sibling->sibling = dp;
 512
 513                 if (!ret)
 514                         ret = dp;
 515                 prev_sibling = dp;
 516
 517                 *(*nextp) = dp;
 518                 *nextp = &dp->allnext;
 519
 520                 dp->path_component_name = build_path_component(dp);
 521                 dp->full_name = build_full_name(dp);
 522
 523                 dp->child = build_tree(dp, prom_getchild(node), nextp);
 524
 525                 node = prom_getsibling(node);
 526         }
 527
 528         return ret;
 529 }
 530
 531 static const char *get_mid_prop(void)
 532 {
 533         return (tlb_type == spitfire ? "upa-portid" : "portid");
 534 }
 535
 536 struct device_node *of_find_node_by_cpuid(int cpuid)
 537 {
 538         struct device_node *dp;
 539         const char *mid_prop = get_mid_prop();
 540
 541         for_each_node_by_type(dp, "cpu") {
 542                 int id = of_getintprop_default(dp, mid_prop, -1);
 543                 const char *this_mid_prop = mid_prop;
 544
 545                 if (id < 0) {
 546                         this_mid_prop = "cpuid";
 547                         id = of_getintprop_default(dp, this_mid_prop, -1);
 548                 }
 549
 550                 if (id < 0) {
 551                         prom_printf("OF: Serious problem, cpu lacks "
 552                                     "%s property", this_mid_prop);
 553                         prom_halt();
 554                 }
 555                 if (cpuid == id)
 556                         return dp;
 557         }
 558         return NULL;
 559 }
 560
 561 static void __init of_fill_in_cpu_data(void)
 562 {
 563         struct device_node *dp;
 564         const char *mid_prop = get_mid_prop();
 565
 566         ncpus_probed = 0;
 567         for_each_node_by_type(dp, "cpu") {
 568                 int cpuid = of_getintprop_default(dp, mid_prop, -1);
 569                 const char *this_mid_prop = mid_prop;
 570                 struct device_node *portid_parent;
 571                 int portid = -1;
 572
 573                 portid_parent = NULL;
 574                 if (cpuid < 0) {
 575                         this_mid_prop = "cpuid";
 576                         cpuid = of_getintprop_default(dp, this_mid_prop, -1);
 577                         if (cpuid >= 0) {
 578                                 int limit = 2;
 579
 580                                 portid_parent = dp;
 581                                 while (limit--) {
 582                                         portid_parent = portid_parent->parent;
 583                                         if (!portid_parent)
 584                                                 break;
 585                                         portid = of_getintprop_default(portid_parent,
 586                                                                        "portid", -1);
 587                                         if (portid >= 0)
 588                                                 break;
 589                                 }
 590                         }
 591                 }
 592
 593                 if (cpuid < 0) {
 594                         prom_printf("OF: Serious problem, cpu lacks "
 595                                     "%s property", this_mid_prop);
 596                         prom_halt();
 597                 }
 598
 599                 ncpus_probed++;
 600
 601 #ifdef CONFIG_SMP
 602                 if (cpuid >= NR_CPUS) {
 603                         printk(KERN_WARNING "Ignoring CPU %d which is "
 604                                ">= NR_CPUS (%d)\n",
 605                                cpuid, NR_CPUS);
 606                         continue;
 607                 }
 608 #else
 609                 /* On uniprocessor we only want the values for the
 610                  * real physical cpu the kernel booted onto, however
 611                  * cpu_data() only has one entry at index 0.
 612                  */
 613                 if (cpuid != real_hard_smp_processor_id())
 614                         continue;
 615                 cpuid = 0;
 616 #endif
 617
 618                 cpu_data(cpuid).clock_tick =
 619                         of_getintprop_default(dp, "clock-frequency", 0);
 620
 621                 if (portid_parent) {
 622                         cpu_data(cpuid).dcache_size =
 623                                 of_getintprop_default(dp, "l1-dcache-size",
 624                                                       16 * 1024);
 625                         cpu_data(cpuid).dcache_line_size =
 626                                 of_getintprop_default(dp, "l1-dcache-line-size",
 627                                                       32);
 628                         cpu_data(cpuid).icache_size =
 629                                 of_getintprop_default(dp, "l1-icache-size",
 630                                                       8 * 1024);
 631                         cpu_data(cpuid).icache_line_size =
 632                                 of_getintprop_default(dp, "l1-icache-line-size",
 633                                                       32);
 634                         cpu_data(cpuid).ecache_size =
 635                                 of_getintprop_default(dp, "l2-cache-size", 0);
 636                         cpu_data(cpuid).ecache_line_size =
 637                                 of_getintprop_default(dp, "l2-cache-line-size", 0);
 638                         if (!cpu_data(cpuid).ecache_size ||
 639                             !cpu_data(cpuid).ecache_line_size) {
 640                                 cpu_data(cpuid).ecache_size =
 641                                         of_getintprop_default(portid_parent,
 642                                                               "l2-cache-size",
 643                                                               (4 * 1024 * 1024));
 644                                 cpu_data(cpuid).ecache_line_size =
 645                                         of_getintprop_default(portid_parent,
 646                                                               "l2-cache-line-size", 64);
 647                         }
 648
 649                         cpu_data(cpuid).core_id = portid + 1;
 650                         cpu_data(cpuid).proc_id = portid;
 651 #ifdef CONFIG_SMP
 652                         sparc64_multi_core = 1;
 653 #endif
 654                 } else {
 655                         cpu_data(cpuid).dcache_size =
 656                                 of_getintprop_default(dp, "dcache-size", 16 * 1024);
 657                         cpu_data(cpuid).dcache_line_size =
 658                                 of_getintprop_default(dp, "dcache-line-size", 32);
 659
 660                         cpu_data(cpuid).icache_size =
 661                                 of_getintprop_default(dp, "icache-size", 16 * 1024);
 662                         cpu_data(cpuid).icache_line_size =
 663                                 of_getintprop_default(dp, "icache-line-size", 32);
 664
 665                         cpu_data(cpuid).ecache_size =
 666                                 of_getintprop_default(dp, "ecache-size",
 667                                                       (4 * 1024 * 1024));
 668                         cpu_data(cpuid).ecache_line_size =
 669                                 of_getintprop_default(dp, "ecache-line-size", 64);
 670
 671                         cpu_data(cpuid).core_id = 0;
 672                         cpu_data(cpuid).proc_id = -1;
 673                 }
 674
 675 #ifdef CONFIG_SMP
 676                 cpu_set(cpuid, cpu_present_map);
 677                 cpu_set(cpuid, cpu_possible_map);
 678 #endif
 679         }
 680
 681         smp_fill_in_sib_core_maps();
 682 }
 683
 684 struct device_node *of_console_device;
 685 EXPORT_SYMBOL(of_console_device);
 686
 687 char *of_console_path;
 688 EXPORT_SYMBOL(of_console_path);
 689
 690 char *of_console_options;
 691 EXPORT_SYMBOL(of_console_options);
 692
 693 static void __init of_console_init(void)
 694 {
 695         char *msg = "OF stdout device is: %s\n";
 696         struct device_node *dp;
 697         const char *type;
 698         phandle node;
 699
 700         of_console_path = prom_early_alloc(256);
 701         if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
 702                 prom_printf("Cannot obtain path of stdout.\n");
 703                 prom_halt();
 704         }
 705         of_console_options = strrchr(of_console_path, ':');
 706         if (of_console_options) {
 707                 of_console_options++;
 708                 if (*of_console_options == '\0')
 709                         of_console_options = NULL;
 710         }
 711
 712         node = prom_inst2pkg(prom_stdout);
 713         if (!node) {
 714                 prom_printf("Cannot resolve stdout node from "
 715                             "instance %08x.\n", prom_stdout);
 716                 prom_halt();
 717         }
 718
 719         dp = of_find_node_by_phandle(node);
 720         type = of_get_property(dp, "device_type", NULL);
 721         if (!type) {
 722                 prom_printf("Console stdout lacks device_type property.\n");
 723                 prom_halt();
 724         }
 725
 726         if (strcmp(type, "display") && strcmp(type, "serial")) {
 727                 prom_printf("Console device_type is neither display "
 728                             "nor serial.\n");
 729                 prom_halt();
 730         }
 731
 732         of_console_device = dp;
 733
 734         printk(msg, of_console_path);
 735 }
 736
 737 void __init prom_build_devicetree(void)
 738 {
 739         struct device_node **nextp;
 740
 741         allnodes = create_node(prom_root_node, NULL);
 742         allnodes->path_component_name = "";
 743         allnodes->full_name = "/";
 744
 745         nextp = &allnodes->allnext;
 746         allnodes->child = build_tree(allnodes,
 747                                      prom_getchild(allnodes->node),
 748                                      &nextp);
 749         of_console_init();
 750
 751         printk("PROM: Built device tree with %u bytes of memory.\n",
 752                prom_early_allocated);
 753
 754         if (tlb_type != hypervisor)
 755                 of_fill_in_cpu_data();
 756 }