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 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #undef DEBUG 17 18 #include <stdarg.h> 19 #include <linux/kernel.h> 20 #include <linux/string.h> 21 #include <linux/init.h> 22 #include <linux/threads.h> 23 #include <linux/spinlock.h> 24 #include <linux/types.h> 25 #include <linux/pci.h> 26 #include <linux/stringify.h> 27 #include <linux/delay.h> 28 #include <linux/initrd.h> 29 #include <linux/bitops.h> 30 #include <linux/module.h> 31 #include <linux/kexec.h> 32 #include <linux/debugfs.h> 33 #include <linux/irq.h> 34 35 #include <asm/prom.h> 36 #include <asm/rtas.h> 37 #include <asm/lmb.h> 38 #include <asm/page.h> 39 #include <asm/processor.h> 40 #include <asm/irq.h> 41 #include <asm/io.h> 42 #include <asm/kdump.h> 43 #include <asm/smp.h> 44 #include <asm/system.h> 45 #include <asm/mmu.h> 46 #include <asm/pgtable.h> 47 #include <asm/pci.h> 48 #include <asm/iommu.h> 49 #include <asm/btext.h> 50 #include <asm/sections.h> 51 #include <asm/machdep.h> 52 #include <asm/pSeries_reconfig.h> 53 #include <asm/pci-bridge.h> 54 #include <asm/kexec.h> 55 56 #ifdef DEBUG 57 #define DBG(fmt...) printk(KERN_ERR fmt) 58 #else 59 #define DBG(fmt...) 60 #endif 61 62 63 static int __initdata dt_root_addr_cells; 64 static int __initdata dt_root_size_cells; 65 66 #ifdef CONFIG_PPC64 67 int __initdata iommu_is_off; 68 int __initdata iommu_force_on; 69 unsigned long tce_alloc_start, tce_alloc_end; 70 #endif 71 72 typedef u32 cell_t; 73 74 #if 0 75 static struct boot_param_header *initial_boot_params __initdata; 76 #else 77 struct boot_param_header *initial_boot_params; 78 #endif 79 80 extern struct device_node *allnodes; /* temporary while merging */ 81 82 extern rwlock_t devtree_lock; /* temporary while merging */ 83 84 /* export that to outside world */ 85 struct device_node *of_chosen; 86 87 static inline char *find_flat_dt_string(u32 offset) 88 { 89 return ((char *)initial_boot_params) + 90 initial_boot_params->off_dt_strings + offset; 91 } 92 93 /** 94 * This function is used to scan the flattened device-tree, it is 95 * used to extract the memory informations at boot before we can 96 * unflatten the tree 97 */ 98 int __init of_scan_flat_dt(int (*it)(unsigned long node, 99 const char *uname, int depth, 100 void *data), 101 void *data) 102 { 103 unsigned long p = ((unsigned long)initial_boot_params) + 104 initial_boot_params->off_dt_struct; 105 int rc = 0; 106 int depth = -1; 107 108 do { 109 u32 tag = *((u32 *)p); 110 char *pathp; 111 112 p += 4; 113 if (tag == OF_DT_END_NODE) { 114 depth --; 115 continue; 116 } 117 if (tag == OF_DT_NOP) 118 continue; 119 if (tag == OF_DT_END) 120 break; 121 if (tag == OF_DT_PROP) { 122 u32 sz = *((u32 *)p); 123 p += 8; 124 if (initial_boot_params->version < 0x10) 125 p = _ALIGN(p, sz >= 8 ? 8 : 4); 126 p += sz; 127 p = _ALIGN(p, 4); 128 continue; 129 } 130 if (tag != OF_DT_BEGIN_NODE) { 131 printk(KERN_WARNING "Invalid tag %x scanning flattened" 132 " device tree !\n", tag); 133 return -EINVAL; 134 } 135 depth++; 136 pathp = (char *)p; 137 p = _ALIGN(p + strlen(pathp) + 1, 4); 138 if ((*pathp) == '/') { 139 char *lp, *np; 140 for (lp = NULL, np = pathp; *np; np++) 141 if ((*np) == '/') 142 lp = np+1; 143 if (lp != NULL) 144 pathp = lp; 145 } 146 rc = it(p, pathp, depth, data); 147 if (rc != 0) 148 break; 149 } while(1); 150 151 return rc; 152 } 153 154 unsigned long __init of_get_flat_dt_root(void) 155 { 156 unsigned long p = ((unsigned long)initial_boot_params) + 157 initial_boot_params->off_dt_struct; 158 159 while(*((u32 *)p) == OF_DT_NOP) 160 p += 4; 161 BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE); 162 p += 4; 163 return _ALIGN(p + strlen((char *)p) + 1, 4); 164 } 165 166 /** 167 * This function can be used within scan_flattened_dt callback to get 168 * access to properties 169 */ 170 void* __init of_get_flat_dt_prop(unsigned long node, const char *name, 171 unsigned long *size) 172 { 173 unsigned long p = node; 174 175 do { 176 u32 tag = *((u32 *)p); 177 u32 sz, noff; 178 const char *nstr; 179 180 p += 4; 181 if (tag == OF_DT_NOP) 182 continue; 183 if (tag != OF_DT_PROP) 184 return NULL; 185 186 sz = *((u32 *)p); 187 noff = *((u32 *)(p + 4)); 188 p += 8; 189 if (initial_boot_params->version < 0x10) 190 p = _ALIGN(p, sz >= 8 ? 8 : 4); 191 192 nstr = find_flat_dt_string(noff); 193 if (nstr == NULL) { 194 printk(KERN_WARNING "Can't find property index" 195 " name !\n"); 196 return NULL; 197 } 198 if (strcmp(name, nstr) == 0) { 199 if (size) 200 *size = sz; 201 return (void *)p; 202 } 203 p += sz; 204 p = _ALIGN(p, 4); 205 } while(1); 206 } 207 208 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) 209 { 210 const char* cp; 211 unsigned long cplen, l; 212 213 cp = of_get_flat_dt_prop(node, "compatible", &cplen); 214 if (cp == NULL) 215 return 0; 216 while (cplen > 0) { 217 if (strncasecmp(cp, compat, strlen(compat)) == 0) 218 return 1; 219 l = strlen(cp) + 1; 220 cp += l; 221 cplen -= l; 222 } 223 224 return 0; 225 } 226 227 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, 228 unsigned long align) 229 { 230 void *res; 231 232 *mem = _ALIGN(*mem, align); 233 res = (void *)*mem; 234 *mem += size; 235 236 return res; 237 } 238 239 static unsigned long __init unflatten_dt_node(unsigned long mem, 240 unsigned long *p, 241 struct device_node *dad, 242 struct device_node ***allnextpp, 243 unsigned long fpsize) 244 { 245 struct device_node *np; 246 struct property *pp, **prev_pp = NULL; 247 char *pathp; 248 u32 tag; 249 unsigned int l, allocl; 250 int has_name = 0; 251 int new_format = 0; 252 253 tag = *((u32 *)(*p)); 254 if (tag != OF_DT_BEGIN_NODE) { 255 printk("Weird tag at start of node: %x\n", tag); 256 return mem; 257 } 258 *p += 4; 259 pathp = (char *)*p; 260 l = allocl = strlen(pathp) + 1; 261 *p = _ALIGN(*p + l, 4); 262 263 /* version 0x10 has a more compact unit name here instead of the full 264 * path. we accumulate the full path size using "fpsize", we'll rebuild 265 * it later. We detect this because the first character of the name is 266 * not '/'. 267 */ 268 if ((*pathp) != '/') { 269 new_format = 1; 270 if (fpsize == 0) { 271 /* root node: special case. fpsize accounts for path 272 * plus terminating zero. root node only has '/', so 273 * fpsize should be 2, but we want to avoid the first 274 * level nodes to have two '/' so we use fpsize 1 here 275 */ 276 fpsize = 1; 277 allocl = 2; 278 } else { 279 /* account for '/' and path size minus terminal 0 280 * already in 'l' 281 */ 282 fpsize += l; 283 allocl = fpsize; 284 } 285 } 286 287 288 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, 289 __alignof__(struct device_node)); 290 if (allnextpp) { 291 memset(np, 0, sizeof(*np)); 292 np->full_name = ((char*)np) + sizeof(struct device_node); 293 if (new_format) { 294 char *p = np->full_name; 295 /* rebuild full path for new format */ 296 if (dad && dad->parent) { 297 strcpy(p, dad->full_name); 298 #ifdef DEBUG 299 if ((strlen(p) + l + 1) != allocl) { 300 DBG("%s: p: %d, l: %d, a: %d\n", 301 pathp, (int)strlen(p), l, allocl); 302 } 303 #endif 304 p += strlen(p); 305 } 306 *(p++) = '/'; 307 memcpy(p, pathp, l); 308 } else 309 memcpy(np->full_name, pathp, l); 310 prev_pp = &np->properties; 311 **allnextpp = np; 312 *allnextpp = &np->allnext; 313 if (dad != NULL) { 314 np->parent = dad; 315 /* we temporarily use the next field as `last_child'*/ 316 if (dad->next == 0) 317 dad->child = np; 318 else 319 dad->next->sibling = np; 320 dad->next = np; 321 } 322 kref_init(&np->kref); 323 } 324 while(1) { 325 u32 sz, noff; 326 char *pname; 327 328 tag = *((u32 *)(*p)); 329 if (tag == OF_DT_NOP) { 330 *p += 4; 331 continue; 332 } 333 if (tag != OF_DT_PROP) 334 break; 335 *p += 4; 336 sz = *((u32 *)(*p)); 337 noff = *((u32 *)((*p) + 4)); 338 *p += 8; 339 if (initial_boot_params->version < 0x10) 340 *p = _ALIGN(*p, sz >= 8 ? 8 : 4); 341 342 pname = find_flat_dt_string(noff); 343 if (pname == NULL) { 344 printk("Can't find property name in list !\n"); 345 break; 346 } 347 if (strcmp(pname, "name") == 0) 348 has_name = 1; 349 l = strlen(pname) + 1; 350 pp = unflatten_dt_alloc(&mem, sizeof(struct property), 351 __alignof__(struct property)); 352 if (allnextpp) { 353 if (strcmp(pname, "linux,phandle") == 0) { 354 np->node = *((u32 *)*p); 355 if (np->linux_phandle == 0) 356 np->linux_phandle = np->node; 357 } 358 if (strcmp(pname, "ibm,phandle") == 0) 359 np->linux_phandle = *((u32 *)*p); 360 pp->name = pname; 361 pp->length = sz; 362 pp->value = (void *)*p; 363 *prev_pp = pp; 364 prev_pp = &pp->next; 365 } 366 *p = _ALIGN((*p) + sz, 4); 367 } 368 /* with version 0x10 we may not have the name property, recreate 369 * it here from the unit name if absent 370 */ 371 if (!has_name) { 372 char *p = pathp, *ps = pathp, *pa = NULL; 373 int sz; 374 375 while (*p) { 376 if ((*p) == '@') 377 pa = p; 378 if ((*p) == '/') 379 ps = p + 1; 380 p++; 381 } 382 if (pa < ps) 383 pa = p; 384 sz = (pa - ps) + 1; 385 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, 386 __alignof__(struct property)); 387 if (allnextpp) { 388 pp->name = "name"; 389 pp->length = sz; 390 pp->value = pp + 1; 391 *prev_pp = pp; 392 prev_pp = &pp->next; 393 memcpy(pp->value, ps, sz - 1); 394 ((char *)pp->value)[sz - 1] = 0; 395 DBG("fixed up name for %s -> %s\n", pathp, 396 (char *)pp->value); 397 } 398 } 399 if (allnextpp) { 400 *prev_pp = NULL; 401 np->name = of_get_property(np, "name", NULL); 402 np->type = of_get_property(np, "device_type", NULL); 403 404 if (!np->name) 405 np->name = "<NULL>"; 406 if (!np->type) 407 np->type = "<NULL>"; 408 } 409 while (tag == OF_DT_BEGIN_NODE) { 410 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); 411 tag = *((u32 *)(*p)); 412 } 413 if (tag != OF_DT_END_NODE) { 414 printk("Weird tag at end of node: %x\n", tag); 415 return mem; 416 } 417 *p += 4; 418 return mem; 419 } 420 421 static int __init early_parse_mem(char *p) 422 { 423 if (!p) 424 return 1; 425 426 memory_limit = PAGE_ALIGN(memparse(p, &p)); 427 DBG("memory limit = 0x%lx\n", memory_limit); 428 429 return 0; 430 } 431 early_param("mem", early_parse_mem); 432 433 /* 434 * The device tree may be allocated below our memory limit, or inside the 435 * crash kernel region for kdump. If so, move it out now. 436 */ 437 static void move_device_tree(void) 438 { 439 unsigned long start, size; 440 void *p; 441 442 DBG("-> move_device_tree\n"); 443 444 start = __pa(initial_boot_params); 445 size = initial_boot_params->totalsize; 446 447 if ((memory_limit && (start + size) > memory_limit) || 448 overlaps_crashkernel(start, size)) { 449 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size)); 450 memcpy(p, initial_boot_params, size); 451 initial_boot_params = (struct boot_param_header *)p; 452 DBG("Moved device tree to 0x%p\n", p); 453 } 454 455 DBG("<- move_device_tree\n"); 456 } 457 458 /** 459 * unflattens the device-tree passed by the firmware, creating the 460 * tree of struct device_node. It also fills the "name" and "type" 461 * pointers of the nodes so the normal device-tree walking functions 462 * can be used (this used to be done by finish_device_tree) 463 */ 464 void __init unflatten_device_tree(void) 465 { 466 unsigned long start, mem, size; 467 struct device_node **allnextp = &allnodes; 468 469 DBG(" -> unflatten_device_tree()\n"); 470 471 /* First pass, scan for size */ 472 start = ((unsigned long)initial_boot_params) + 473 initial_boot_params->off_dt_struct; 474 size = unflatten_dt_node(0, &start, NULL, NULL, 0); 475 size = (size | 3) + 1; 476 477 DBG(" size is %lx, allocating...\n", size); 478 479 /* Allocate memory for the expanded device tree */ 480 mem = lmb_alloc(size + 4, __alignof__(struct device_node)); 481 mem = (unsigned long) __va(mem); 482 483 ((u32 *)mem)[size / 4] = 0xdeadbeef; 484 485 DBG(" unflattening %lx...\n", mem); 486 487 /* Second pass, do actual unflattening */ 488 start = ((unsigned long)initial_boot_params) + 489 initial_boot_params->off_dt_struct; 490 unflatten_dt_node(mem, &start, NULL, &allnextp, 0); 491 if (*((u32 *)start) != OF_DT_END) 492 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); 493 if (((u32 *)mem)[size / 4] != 0xdeadbeef) 494 printk(KERN_WARNING "End of tree marker overwritten: %08x\n", 495 ((u32 *)mem)[size / 4] ); 496 *allnextp = NULL; 497 498 /* Get pointer to OF "/chosen" node for use everywhere */ 499 of_chosen = of_find_node_by_path("/chosen"); 500 if (of_chosen == NULL) 501 of_chosen = of_find_node_by_path("/chosen@0"); 502 503 DBG(" <- unflatten_device_tree()\n"); 504 } 505 506 /* 507 * ibm,pa-features is a per-cpu property that contains a string of 508 * attribute descriptors, each of which has a 2 byte header plus up 509 * to 254 bytes worth of processor attribute bits. First header 510 * byte specifies the number of bytes following the header. 511 * Second header byte is an "attribute-specifier" type, of which 512 * zero is the only currently-defined value. 513 * Implementation: Pass in the byte and bit offset for the feature 514 * that we are interested in. The function will return -1 if the 515 * pa-features property is missing, or a 1/0 to indicate if the feature 516 * is supported/not supported. Note that the bit numbers are 517 * big-endian to match the definition in PAPR. 518 */ 519 static struct ibm_pa_feature { 520 unsigned long cpu_features; /* CPU_FTR_xxx bit */ 521 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ 522 unsigned char pabyte; /* byte number in ibm,pa-features */ 523 unsigned char pabit; /* bit number (big-endian) */ 524 unsigned char invert; /* if 1, pa bit set => clear feature */ 525 } ibm_pa_features[] __initdata = { 526 {0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, 527 {0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, 528 {CPU_FTR_SLB, 0, 0, 2, 0}, 529 {CPU_FTR_CTRL, 0, 0, 3, 0}, 530 {CPU_FTR_NOEXECUTE, 0, 0, 6, 0}, 531 {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1}, 532 #if 0 533 /* put this back once we know how to test if firmware does 64k IO */ 534 {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, 535 #endif 536 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, 537 }; 538 539 static void __init scan_features(unsigned long node, unsigned char *ftrs, 540 unsigned long tablelen, 541 struct ibm_pa_feature *fp, 542 unsigned long ft_size) 543 { 544 unsigned long i, len, bit; 545 546 /* find descriptor with type == 0 */ 547 for (;;) { 548 if (tablelen < 3) 549 return; 550 len = 2 + ftrs[0]; 551 if (tablelen < len) 552 return; /* descriptor 0 not found */ 553 if (ftrs[1] == 0) 554 break; 555 tablelen -= len; 556 ftrs += len; 557 } 558 559 /* loop over bits we know about */ 560 for (i = 0; i < ft_size; ++i, ++fp) { 561 if (fp->pabyte >= ftrs[0]) 562 continue; 563 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; 564 if (bit ^ fp->invert) { 565 cur_cpu_spec->cpu_features |= fp->cpu_features; 566 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; 567 } else { 568 cur_cpu_spec->cpu_features &= ~fp->cpu_features; 569 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; 570 } 571 } 572 } 573 574 static void __init check_cpu_pa_features(unsigned long node) 575 { 576 unsigned char *pa_ftrs; 577 unsigned long tablelen; 578 579 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); 580 if (pa_ftrs == NULL) 581 return; 582 583 scan_features(node, pa_ftrs, tablelen, 584 ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); 585 } 586 587 static struct feature_property { 588 const char *name; 589 u32 min_value; 590 unsigned long cpu_feature; 591 unsigned long cpu_user_ftr; 592 } feature_properties[] __initdata = { 593 #ifdef CONFIG_ALTIVEC 594 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 595 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 596 #endif /* CONFIG_ALTIVEC */ 597 #ifdef CONFIG_PPC64 598 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, 599 {"ibm,purr", 1, CPU_FTR_PURR, 0}, 600 {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, 601 #endif /* CONFIG_PPC64 */ 602 }; 603 604 static void __init check_cpu_feature_properties(unsigned long node) 605 { 606 unsigned long i; 607 struct feature_property *fp = feature_properties; 608 const u32 *prop; 609 610 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { 611 prop = of_get_flat_dt_prop(node, fp->name, NULL); 612 if (prop && *prop >= fp->min_value) { 613 cur_cpu_spec->cpu_features |= fp->cpu_feature; 614 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; 615 } 616 } 617 } 618 619 static int __init early_init_dt_scan_cpus(unsigned long node, 620 const char *uname, int depth, 621 void *data) 622 { 623 static int logical_cpuid = 0; 624 char *type = of_get_flat_dt_prop(node, "device_type", NULL); 625 const u32 *prop; 626 const u32 *intserv; 627 int i, nthreads; 628 unsigned long len; 629 int found = 0; 630 631 /* We are scanning "cpu" nodes only */ 632 if (type == NULL || strcmp(type, "cpu") != 0) 633 return 0; 634 635 /* Get physical cpuid */ 636 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); 637 if (intserv) { 638 nthreads = len / sizeof(int); 639 } else { 640 intserv = of_get_flat_dt_prop(node, "reg", NULL); 641 nthreads = 1; 642 } 643 644 /* 645 * Now see if any of these threads match our boot cpu. 646 * NOTE: This must match the parsing done in smp_setup_cpu_maps. 647 */ 648 for (i = 0; i < nthreads; i++) { 649 /* 650 * version 2 of the kexec param format adds the phys cpuid of 651 * booted proc. 652 */ 653 if (initial_boot_params && initial_boot_params->version >= 2) { 654 if (intserv[i] == 655 initial_boot_params->boot_cpuid_phys) { 656 found = 1; 657 break; 658 } 659 } else { 660 /* 661 * Check if it's the boot-cpu, set it's hw index now, 662 * unfortunately this format did not support booting 663 * off secondary threads. 664 */ 665 if (of_get_flat_dt_prop(node, 666 "linux,boot-cpu", NULL) != NULL) { 667 found = 1; 668 break; 669 } 670 } 671 672 #ifdef CONFIG_SMP 673 /* logical cpu id is always 0 on UP kernels */ 674 logical_cpuid++; 675 #endif 676 } 677 678 if (found) { 679 DBG("boot cpu: logical %d physical %d\n", logical_cpuid, 680 intserv[i]); 681 boot_cpuid = logical_cpuid; 682 set_hard_smp_processor_id(boot_cpuid, intserv[i]); 683 684 /* 685 * PAPR defines "logical" PVR values for cpus that 686 * meet various levels of the architecture: 687 * 0x0f000001 Architecture version 2.04 688 * 0x0f000002 Architecture version 2.05 689 * If the cpu-version property in the cpu node contains 690 * such a value, we call identify_cpu again with the 691 * logical PVR value in order to use the cpu feature 692 * bits appropriate for the architecture level. 693 * 694 * A POWER6 partition in "POWER6 architected" mode 695 * uses the 0x0f000002 PVR value; in POWER5+ mode 696 * it uses 0x0f000001. 697 */ 698 prop = of_get_flat_dt_prop(node, "cpu-version", NULL); 699 if (prop && (*prop & 0xff000000) == 0x0f000000) 700 identify_cpu(0, *prop); 701 } 702 703 check_cpu_feature_properties(node); 704 check_cpu_pa_features(node); 705 706 #ifdef CONFIG_PPC_PSERIES 707 if (nthreads > 1) 708 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 709 else 710 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 711 #endif 712 713 return 0; 714 } 715 716 #ifdef CONFIG_BLK_DEV_INITRD 717 static void __init early_init_dt_check_for_initrd(unsigned long node) 718 { 719 unsigned long l; 720 u32 *prop; 721 722 DBG("Looking for initrd properties... "); 723 724 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l); 725 if (prop) { 726 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4)); 727 728 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l); 729 if (prop) { 730 initrd_end = (unsigned long) 731 __va(of_read_ulong(prop, l/4)); 732 initrd_below_start_ok = 1; 733 } else { 734 initrd_start = 0; 735 } 736 } 737 738 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start, initrd_end); 739 } 740 #else 741 static inline void early_init_dt_check_for_initrd(unsigned long node) 742 { 743 } 744 #endif /* CONFIG_BLK_DEV_INITRD */ 745 746 static int __init early_init_dt_scan_chosen(unsigned long node, 747 const char *uname, int depth, void *data) 748 { 749 unsigned long *lprop; 750 unsigned long l; 751 char *p; 752 753 DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); 754 755 if (depth != 1 || 756 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 757 return 0; 758 759 #ifdef CONFIG_PPC64 760 /* check if iommu is forced on or off */ 761 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) 762 iommu_is_off = 1; 763 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) 764 iommu_force_on = 1; 765 #endif 766 767 /* mem=x on the command line is the preferred mechanism */ 768 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); 769 if (lprop) 770 memory_limit = *lprop; 771 772 #ifdef CONFIG_PPC64 773 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); 774 if (lprop) 775 tce_alloc_start = *lprop; 776 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); 777 if (lprop) 778 tce_alloc_end = *lprop; 779 #endif 780 781 #ifdef CONFIG_KEXEC 782 lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); 783 if (lprop) 784 crashk_res.start = *lprop; 785 786 lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); 787 if (lprop) 788 crashk_res.end = crashk_res.start + *lprop - 1; 789 #endif 790 791 early_init_dt_check_for_initrd(node); 792 793 /* Retreive command line */ 794 p = of_get_flat_dt_prop(node, "bootargs", &l); 795 if (p != NULL && l > 0) 796 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE)); 797 798 #ifdef CONFIG_CMDLINE 799 if (p == NULL || l == 0 || (l == 1 && (*p) == 0)) 800 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 801 #endif /* CONFIG_CMDLINE */ 802 803 DBG("Command line is: %s\n", cmd_line); 804 805 /* break now */ 806 return 1; 807 } 808 809 static int __init early_init_dt_scan_root(unsigned long node, 810 const char *uname, int depth, void *data) 811 { 812 u32 *prop; 813 814 if (depth != 0) 815 return 0; 816 817 prop = of_get_flat_dt_prop(node, "#size-cells", NULL); 818 dt_root_size_cells = (prop == NULL) ? 1 : *prop; 819 DBG("dt_root_size_cells = %x\n", dt_root_size_cells); 820 821 prop = of_get_flat_dt_prop(node, "#address-cells", NULL); 822 dt_root_addr_cells = (prop == NULL) ? 2 : *prop; 823 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); 824 825 /* break now */ 826 return 1; 827 } 828 829 static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) 830 { 831 cell_t *p = *cellp; 832 833 *cellp = p + s; 834 return of_read_ulong(p, s); 835 } 836 837 #ifdef CONFIG_PPC_PSERIES 838 /* 839 * Interpret the ibm,dynamic-memory property in the 840 * /ibm,dynamic-reconfiguration-memory node. 841 * This contains a list of memory blocks along with NUMA affinity 842 * information. 843 */ 844 static int __init early_init_dt_scan_drconf_memory(unsigned long node) 845 { 846 cell_t *dm, *ls; 847 unsigned long l, n; 848 unsigned long base, size, lmb_size, flags; 849 850 ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l); 851 if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t)) 852 return 0; 853 lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls); 854 855 dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); 856 if (dm == NULL || l < sizeof(cell_t)) 857 return 0; 858 859 n = *dm++; /* number of entries */ 860 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t)) 861 return 0; 862 863 for (; n != 0; --n) { 864 base = dt_mem_next_cell(dt_root_addr_cells, &dm); 865 flags = dm[3]; 866 /* skip DRC index, pad, assoc. list index, flags */ 867 dm += 4; 868 /* skip this block if the reserved bit is set in flags (0x80) 869 or if the block is not assigned to this partition (0x8) */ 870 if ((flags & 0x80) || !(flags & 0x8)) 871 continue; 872 size = lmb_size; 873 if (iommu_is_off) { 874 if (base >= 0x80000000ul) 875 continue; 876 if ((base + size) > 0x80000000ul) 877 size = 0x80000000ul - base; 878 } 879 lmb_add(base, size); 880 } 881 lmb_dump_all(); 882 return 0; 883 } 884 #else 885 #define early_init_dt_scan_drconf_memory(node) 0 886 #endif /* CONFIG_PPC_PSERIES */ 887 888 static int __init early_init_dt_scan_memory(unsigned long node, 889 const char *uname, int depth, void *data) 890 { 891 char *type = of_get_flat_dt_prop(node, "device_type", NULL); 892 cell_t *reg, *endp; 893 unsigned long l; 894 895 /* Look for the ibm,dynamic-reconfiguration-memory node */ 896 if (depth == 1 && 897 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) 898 return early_init_dt_scan_drconf_memory(node); 899 900 /* We are scanning "memory" nodes only */ 901 if (type == NULL) { 902 /* 903 * The longtrail doesn't have a device_type on the 904 * /memory node, so look for the node called /memory@0. 905 */ 906 if (depth != 1 || strcmp(uname, "memory@0") != 0) 907 return 0; 908 } else if (strcmp(type, "memory") != 0) 909 return 0; 910 911 reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l); 912 if (reg == NULL) 913 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l); 914 if (reg == NULL) 915 return 0; 916 917 endp = reg + (l / sizeof(cell_t)); 918 919 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", 920 uname, l, reg[0], reg[1], reg[2], reg[3]); 921 922 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { 923 unsigned long base, size; 924 925 base = dt_mem_next_cell(dt_root_addr_cells, ®); 926 size = dt_mem_next_cell(dt_root_size_cells, ®); 927 928 if (size == 0) 929 continue; 930 DBG(" - %lx , %lx\n", base, size); 931 #ifdef CONFIG_PPC64 932 if (iommu_is_off) { 933 if (base >= 0x80000000ul) 934 continue; 935 if ((base + size) > 0x80000000ul) 936 size = 0x80000000ul - base; 937 } 938 #endif 939 lmb_add(base, size); 940 } 941 return 0; 942 } 943 944 static void __init early_reserve_mem(void) 945 { 946 u64 base, size; 947 u64 *reserve_map; 948 unsigned long self_base; 949 unsigned long self_size; 950 951 reserve_map = (u64 *)(((unsigned long)initial_boot_params) + 952 initial_boot_params->off_mem_rsvmap); 953 954 /* before we do anything, lets reserve the dt blob */ 955 self_base = __pa((unsigned long)initial_boot_params); 956 self_size = initial_boot_params->totalsize; 957 lmb_reserve(self_base, self_size); 958 959 #ifdef CONFIG_BLK_DEV_INITRD 960 /* then reserve the initrd, if any */ 961 if (initrd_start && (initrd_end > initrd_start)) 962 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start); 963 #endif /* CONFIG_BLK_DEV_INITRD */ 964 965 #ifdef CONFIG_PPC32 966 /* 967 * Handle the case where we might be booting from an old kexec 968 * image that setup the mem_rsvmap as pairs of 32-bit values 969 */ 970 if (*reserve_map > 0xffffffffull) { 971 u32 base_32, size_32; 972 u32 *reserve_map_32 = (u32 *)reserve_map; 973 974 while (1) { 975 base_32 = *(reserve_map_32++); 976 size_32 = *(reserve_map_32++); 977 if (size_32 == 0) 978 break; 979 /* skip if the reservation is for the blob */ 980 if (base_32 == self_base && size_32 == self_size) 981 continue; 982 DBG("reserving: %x -> %x\n", base_32, size_32); 983 lmb_reserve(base_32, size_32); 984 } 985 return; 986 } 987 #endif 988 while (1) { 989 base = *(reserve_map++); 990 size = *(reserve_map++); 991 if (size == 0) 992 break; 993 DBG("reserving: %llx -> %llx\n", base, size); 994 lmb_reserve(base, size); 995 } 996 997 #if 0 998 DBG("memory reserved, lmbs :\n"); 999 lmb_dump_all(); 1000 #endif 1001 } 1002 1003 void __init early_init_devtree(void *params) 1004 { 1005 DBG(" -> early_init_devtree(%p)\n", params); 1006 1007 /* Setup flat device-tree pointer */ 1008 initial_boot_params = params; 1009 1010 #ifdef CONFIG_PPC_RTAS 1011 /* Some machines might need RTAS info for debugging, grab it now. */ 1012 of_scan_flat_dt(early_init_dt_scan_rtas, NULL); 1013 #endif 1014 1015 /* Retrieve various informations from the /chosen node of the 1016 * device-tree, including the platform type, initrd location and 1017 * size, TCE reserve, and more ... 1018 */ 1019 of_scan_flat_dt(early_init_dt_scan_chosen, NULL); 1020 1021 /* Scan memory nodes and rebuild LMBs */ 1022 lmb_init(); 1023 of_scan_flat_dt(early_init_dt_scan_root, NULL); 1024 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 1025 1026 /* Save command line for /proc/cmdline and then parse parameters */ 1027 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); 1028 parse_early_param(); 1029 1030 /* Reserve LMB regions used by kernel, initrd, dt, etc... */ 1031 lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); 1032 reserve_kdump_trampoline(); 1033 reserve_crashkernel(); 1034 early_reserve_mem(); 1035 1036 lmb_enforce_memory_limit(memory_limit); 1037 lmb_analyze(); 1038 1039 DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); 1040 1041 /* We may need to relocate the flat tree, do it now. 1042 * FIXME .. and the initrd too? */ 1043 move_device_tree(); 1044 1045 DBG("Scanning CPUs ...\n"); 1046 1047 /* Retreive CPU related informations from the flat tree 1048 * (altivec support, boot CPU ID, ...) 1049 */ 1050 of_scan_flat_dt(early_init_dt_scan_cpus, NULL); 1051 1052 DBG(" <- early_init_devtree()\n"); 1053 } 1054 1055 1056 /** 1057 * Indicates whether the root node has a given value in its 1058 * compatible property. 1059 */ 1060 int machine_is_compatible(const char *compat) 1061 { 1062 struct device_node *root; 1063 int rc = 0; 1064 1065 root = of_find_node_by_path("/"); 1066 if (root) { 1067 rc = of_device_is_compatible(root, compat); 1068 of_node_put(root); 1069 } 1070 return rc; 1071 } 1072 EXPORT_SYMBOL(machine_is_compatible); 1073 1074 /******* 1075 * 1076 * New implementation of the OF "find" APIs, return a refcounted 1077 * object, call of_node_put() when done. The device tree and list 1078 * are protected by a rw_lock. 1079 * 1080 * Note that property management will need some locking as well, 1081 * this isn't dealt with yet. 1082 * 1083 *******/ 1084 1085 /** 1086 * of_find_node_by_phandle - Find a node given a phandle 1087 * @handle: phandle of the node to find 1088 * 1089 * Returns a node pointer with refcount incremented, use 1090 * of_node_put() on it when done. 1091 */ 1092 struct device_node *of_find_node_by_phandle(phandle handle) 1093 { 1094 struct device_node *np; 1095 1096 read_lock(&devtree_lock); 1097 for (np = allnodes; np != 0; np = np->allnext) 1098 if (np->linux_phandle == handle) 1099 break; 1100 of_node_get(np); 1101 read_unlock(&devtree_lock); 1102 return np; 1103 } 1104 EXPORT_SYMBOL(of_find_node_by_phandle); 1105 1106 /** 1107 * of_find_all_nodes - Get next node in global list 1108 * @prev: Previous node or NULL to start iteration 1109 * of_node_put() will be called on it 1110 * 1111 * Returns a node pointer with refcount incremented, use 1112 * of_node_put() on it when done. 1113 */ 1114 struct device_node *of_find_all_nodes(struct device_node *prev) 1115 { 1116 struct device_node *np; 1117 1118 read_lock(&devtree_lock); 1119 np = prev ? prev->allnext : allnodes; 1120 for (; np != 0; np = np->allnext) 1121 if (of_node_get(np)) 1122 break; 1123 of_node_put(prev); 1124 read_unlock(&devtree_lock); 1125 return np; 1126 } 1127 EXPORT_SYMBOL(of_find_all_nodes); 1128 1129 /** 1130 * of_node_get - Increment refcount of a node 1131 * @node: Node to inc refcount, NULL is supported to 1132 * simplify writing of callers 1133 * 1134 * Returns node. 1135 */ 1136 struct device_node *of_node_get(struct device_node *node) 1137 { 1138 if (node) 1139 kref_get(&node->kref); 1140 return node; 1141 } 1142 EXPORT_SYMBOL(of_node_get); 1143 1144 static inline struct device_node * kref_to_device_node(struct kref *kref) 1145 { 1146 return container_of(kref, struct device_node, kref); 1147 } 1148 1149 /** 1150 * of_node_release - release a dynamically allocated node 1151 * @kref: kref element of the node to be released 1152 * 1153 * In of_node_put() this function is passed to kref_put() 1154 * as the destructor. 1155 */ 1156 static void of_node_release(struct kref *kref) 1157 { 1158 struct device_node *node = kref_to_device_node(kref); 1159 struct property *prop = node->properties; 1160 1161 /* We should never be releasing nodes that haven't been detached. */ 1162 if (!of_node_check_flag(node, OF_DETACHED)) { 1163 printk("WARNING: Bad of_node_put() on %s\n", node->full_name); 1164 dump_stack(); 1165 kref_init(&node->kref); 1166 return; 1167 } 1168 1169 if (!of_node_check_flag(node, OF_DYNAMIC)) 1170 return; 1171 1172 while (prop) { 1173 struct property *next = prop->next; 1174 kfree(prop->name); 1175 kfree(prop->value); 1176 kfree(prop); 1177 prop = next; 1178 1179 if (!prop) { 1180 prop = node->deadprops; 1181 node->deadprops = NULL; 1182 } 1183 } 1184 kfree(node->full_name); 1185 kfree(node->data); 1186 kfree(node); 1187 } 1188 1189 /** 1190 * of_node_put - Decrement refcount of a node 1191 * @node: Node to dec refcount, NULL is supported to 1192 * simplify writing of callers 1193 * 1194 */ 1195 void of_node_put(struct device_node *node) 1196 { 1197 if (node) 1198 kref_put(&node->kref, of_node_release); 1199 } 1200 EXPORT_SYMBOL(of_node_put); 1201 1202 /* 1203 * Plug a device node into the tree and global list. 1204 */ 1205 void of_attach_node(struct device_node *np) 1206 { 1207 write_lock(&devtree_lock); 1208 np->sibling = np->parent->child; 1209 np->allnext = allnodes; 1210 np->parent->child = np; 1211 allnodes = np; 1212 write_unlock(&devtree_lock); 1213 } 1214 1215 /* 1216 * "Unplug" a node from the device tree. The caller must hold 1217 * a reference to the node. The memory associated with the node 1218 * is not freed until its refcount goes to zero. 1219 */ 1220 void of_detach_node(struct device_node *np) 1221 { 1222 struct device_node *parent; 1223 1224 write_lock(&devtree_lock); 1225 1226 parent = np->parent; 1227 if (!parent) 1228 goto out_unlock; 1229 1230 if (allnodes == np) 1231 allnodes = np->allnext; 1232 else { 1233 struct device_node *prev; 1234 for (prev = allnodes; 1235 prev->allnext != np; 1236 prev = prev->allnext) 1237 ; 1238 prev->allnext = np->allnext; 1239 } 1240 1241 if (parent->child == np) 1242 parent->child = np->sibling; 1243 else { 1244 struct device_node *prevsib; 1245 for (prevsib = np->parent->child; 1246 prevsib->sibling != np; 1247 prevsib = prevsib->sibling) 1248 ; 1249 prevsib->sibling = np->sibling; 1250 } 1251 1252 of_node_set_flag(np, OF_DETACHED); 1253 1254 out_unlock: 1255 write_unlock(&devtree_lock); 1256 } 1257 1258 #ifdef CONFIG_PPC_PSERIES 1259 /* 1260 * Fix up the uninitialized fields in a new device node: 1261 * name, type and pci-specific fields 1262 */ 1263 1264 static int of_finish_dynamic_node(struct device_node *node) 1265 { 1266 struct device_node *parent = of_get_parent(node); 1267 int err = 0; 1268 const phandle *ibm_phandle; 1269 1270 node->name = of_get_property(node, "name", NULL); 1271 node->type = of_get_property(node, "device_type", NULL); 1272 1273 if (!node->name) 1274 node->name = "<NULL>"; 1275 if (!node->type) 1276 node->type = "<NULL>"; 1277 1278 if (!parent) { 1279 err = -ENODEV; 1280 goto out; 1281 } 1282 1283 /* We don't support that function on PowerMac, at least 1284 * not yet 1285 */ 1286 if (machine_is(powermac)) 1287 return -ENODEV; 1288 1289 /* fix up new node's linux_phandle field */ 1290 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL))) 1291 node->linux_phandle = *ibm_phandle; 1292 1293 out: 1294 of_node_put(parent); 1295 return err; 1296 } 1297 1298 static int prom_reconfig_notifier(struct notifier_block *nb, 1299 unsigned long action, void *node) 1300 { 1301 int err; 1302 1303 switch (action) { 1304 case PSERIES_RECONFIG_ADD: 1305 err = of_finish_dynamic_node(node); 1306 if (err < 0) { 1307 printk(KERN_ERR "finish_node returned %d\n", err); 1308 err = NOTIFY_BAD; 1309 } 1310 break; 1311 default: 1312 err = NOTIFY_DONE; 1313 break; 1314 } 1315 return err; 1316 } 1317 1318 static struct notifier_block prom_reconfig_nb = { 1319 .notifier_call = prom_reconfig_notifier, 1320 .priority = 10, /* This one needs to run first */ 1321 }; 1322 1323 static int __init prom_reconfig_setup(void) 1324 { 1325 return pSeries_reconfig_notifier_register(&prom_reconfig_nb); 1326 } 1327 __initcall(prom_reconfig_setup); 1328 #endif 1329 1330 /* 1331 * Add a property to a node 1332 */ 1333 int prom_add_property(struct device_node* np, struct property* prop) 1334 { 1335 struct property **next; 1336 1337 prop->next = NULL; 1338 write_lock(&devtree_lock); 1339 next = &np->properties; 1340 while (*next) { 1341 if (strcmp(prop->name, (*next)->name) == 0) { 1342 /* duplicate ! don't insert it */ 1343 write_unlock(&devtree_lock); 1344 return -1; 1345 } 1346 next = &(*next)->next; 1347 } 1348 *next = prop; 1349 write_unlock(&devtree_lock); 1350 1351 #ifdef CONFIG_PROC_DEVICETREE 1352 /* try to add to proc as well if it was initialized */ 1353 if (np->pde) 1354 proc_device_tree_add_prop(np->pde, prop); 1355 #endif /* CONFIG_PROC_DEVICETREE */ 1356 1357 return 0; 1358 } 1359 1360 /* 1361 * Remove a property from a node. Note that we don't actually 1362 * remove it, since we have given out who-knows-how-many pointers 1363 * to the data using get-property. Instead we just move the property 1364 * to the "dead properties" list, so it won't be found any more. 1365 */ 1366 int prom_remove_property(struct device_node *np, struct property *prop) 1367 { 1368 struct property **next; 1369 int found = 0; 1370 1371 write_lock(&devtree_lock); 1372 next = &np->properties; 1373 while (*next) { 1374 if (*next == prop) { 1375 /* found the node */ 1376 *next = prop->next; 1377 prop->next = np->deadprops; 1378 np->deadprops = prop; 1379 found = 1; 1380 break; 1381 } 1382 next = &(*next)->next; 1383 } 1384 write_unlock(&devtree_lock); 1385 1386 if (!found) 1387 return -ENODEV; 1388 1389 #ifdef CONFIG_PROC_DEVICETREE 1390 /* try to remove the proc node as well */ 1391 if (np->pde) 1392 proc_device_tree_remove_prop(np->pde, prop); 1393 #endif /* CONFIG_PROC_DEVICETREE */ 1394 1395 return 0; 1396 } 1397 1398 /* 1399 * Update a property in a node. Note that we don't actually 1400 * remove it, since we have given out who-knows-how-many pointers 1401 * to the data using get-property. Instead we just move the property 1402 * to the "dead properties" list, and add the new property to the 1403 * property list 1404 */ 1405 int prom_update_property(struct device_node *np, 1406 struct property *newprop, 1407 struct property *oldprop) 1408 { 1409 struct property **next; 1410 int found = 0; 1411 1412 write_lock(&devtree_lock); 1413 next = &np->properties; 1414 while (*next) { 1415 if (*next == oldprop) { 1416 /* found the node */ 1417 newprop->next = oldprop->next; 1418 *next = newprop; 1419 oldprop->next = np->deadprops; 1420 np->deadprops = oldprop; 1421 found = 1; 1422 break; 1423 } 1424 next = &(*next)->next; 1425 } 1426 write_unlock(&devtree_lock); 1427 1428 if (!found) 1429 return -ENODEV; 1430 1431 #ifdef CONFIG_PROC_DEVICETREE 1432 /* try to add to proc as well if it was initialized */ 1433 if (np->pde) 1434 proc_device_tree_update_prop(np->pde, newprop, oldprop); 1435 #endif /* CONFIG_PROC_DEVICETREE */ 1436 1437 return 0; 1438 } 1439 1440 1441 /* Find the device node for a given logical cpu number, also returns the cpu 1442 * local thread number (index in ibm,interrupt-server#s) if relevant and 1443 * asked for (non NULL) 1444 */ 1445 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) 1446 { 1447 int hardid; 1448 struct device_node *np; 1449 1450 hardid = get_hard_smp_processor_id(cpu); 1451 1452 for_each_node_by_type(np, "cpu") { 1453 const u32 *intserv; 1454 unsigned int plen, t; 1455 1456 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist 1457 * fallback to "reg" property and assume no threads 1458 */ 1459 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", 1460 &plen); 1461 if (intserv == NULL) { 1462 const u32 *reg = of_get_property(np, "reg", NULL); 1463 if (reg == NULL) 1464 continue; 1465 if (*reg == hardid) { 1466 if (thread) 1467 *thread = 0; 1468 return np; 1469 } 1470 } else { 1471 plen /= sizeof(u32); 1472 for (t = 0; t < plen; t++) { 1473 if (hardid == intserv[t]) { 1474 if (thread) 1475 *thread = t; 1476 return np; 1477 } 1478 } 1479 } 1480 } 1481 return NULL; 1482 } 1483 EXPORT_SYMBOL(of_get_cpu_node); 1484 1485 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) 1486 static struct debugfs_blob_wrapper flat_dt_blob; 1487 1488 static int __init export_flat_device_tree(void) 1489 { 1490 struct dentry *d; 1491 1492 flat_dt_blob.data = initial_boot_params; 1493 flat_dt_blob.size = initial_boot_params->totalsize; 1494 1495 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, 1496 powerpc_debugfs_root, &flat_dt_blob); 1497 if (!d) 1498 return 1; 1499 1500 return 0; 1501 } 1502 __initcall(export_flat_device_tree); 1503 #endif 1504