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/export.h> 31 #include <linux/kexec.h> 32 #include <linux/debugfs.h> 33 #include <linux/irq.h> 34 #include <linux/memblock.h> 35 #include <linux/of.h> 36 37 #include <asm/prom.h> 38 #include <asm/rtas.h> 39 #include <asm/page.h> 40 #include <asm/processor.h> 41 #include <asm/irq.h> 42 #include <asm/io.h> 43 #include <asm/kdump.h> 44 #include <asm/smp.h> 45 #include <asm/mmu.h> 46 #include <asm/paca.h> 47 #include <asm/pgtable.h> 48 #include <asm/pci.h> 49 #include <asm/iommu.h> 50 #include <asm/btext.h> 51 #include <asm/sections.h> 52 #include <asm/machdep.h> 53 #include <asm/pci-bridge.h> 54 #include <asm/kexec.h> 55 #include <asm/opal.h> 56 #include <asm/fadump.h> 57 #include <asm/debug.h> 58 59 #include <mm/mmu_decl.h> 60 61 #ifdef DEBUG 62 #define DBG(fmt...) printk(KERN_ERR fmt) 63 #else 64 #define DBG(fmt...) 65 #endif 66 67 #ifdef CONFIG_PPC64 68 int __initdata iommu_is_off; 69 int __initdata iommu_force_on; 70 unsigned long tce_alloc_start, tce_alloc_end; 71 u64 ppc64_rma_size; 72 #endif 73 static phys_addr_t first_memblock_size; 74 static int __initdata boot_cpu_count; 75 76 static int __init early_parse_mem(char *p) 77 { 78 if (!p) 79 return 1; 80 81 memory_limit = PAGE_ALIGN(memparse(p, &p)); 82 DBG("memory limit = 0x%llx\n", memory_limit); 83 84 return 0; 85 } 86 early_param("mem", early_parse_mem); 87 88 /* 89 * overlaps_initrd - check for overlap with page aligned extension of 90 * initrd. 91 */ 92 static inline int overlaps_initrd(unsigned long start, unsigned long size) 93 { 94 #ifdef CONFIG_BLK_DEV_INITRD 95 if (!initrd_start) 96 return 0; 97 98 return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) && 99 start <= _ALIGN_UP(initrd_end, PAGE_SIZE); 100 #else 101 return 0; 102 #endif 103 } 104 105 /** 106 * move_device_tree - move tree to an unused area, if needed. 107 * 108 * The device tree may be allocated beyond our memory limit, or inside the 109 * crash kernel region for kdump, or within the page aligned range of initrd. 110 * If so, move it out of the way. 111 */ 112 static void __init move_device_tree(void) 113 { 114 unsigned long start, size; 115 void *p; 116 117 DBG("-> move_device_tree\n"); 118 119 start = __pa(initial_boot_params); 120 size = be32_to_cpu(initial_boot_params->totalsize); 121 122 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || 123 overlaps_crashkernel(start, size) || 124 overlaps_initrd(start, size)) { 125 p = __va(memblock_alloc(size, PAGE_SIZE)); 126 memcpy(p, initial_boot_params, size); 127 initial_boot_params = (struct boot_param_header *)p; 128 DBG("Moved device tree to 0x%p\n", p); 129 } 130 131 DBG("<- move_device_tree\n"); 132 } 133 134 /* 135 * ibm,pa-features is a per-cpu property that contains a string of 136 * attribute descriptors, each of which has a 2 byte header plus up 137 * to 254 bytes worth of processor attribute bits. First header 138 * byte specifies the number of bytes following the header. 139 * Second header byte is an "attribute-specifier" type, of which 140 * zero is the only currently-defined value. 141 * Implementation: Pass in the byte and bit offset for the feature 142 * that we are interested in. The function will return -1 if the 143 * pa-features property is missing, or a 1/0 to indicate if the feature 144 * is supported/not supported. Note that the bit numbers are 145 * big-endian to match the definition in PAPR. 146 */ 147 static struct ibm_pa_feature { 148 unsigned long cpu_features; /* CPU_FTR_xxx bit */ 149 unsigned long mmu_features; /* MMU_FTR_xxx bit */ 150 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ 151 unsigned char pabyte; /* byte number in ibm,pa-features */ 152 unsigned char pabit; /* bit number (big-endian) */ 153 unsigned char invert; /* if 1, pa bit set => clear feature */ 154 } ibm_pa_features[] __initdata = { 155 {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, 156 {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, 157 {0, MMU_FTR_SLB, 0, 0, 2, 0}, 158 {CPU_FTR_CTRL, 0, 0, 0, 3, 0}, 159 {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0}, 160 {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1}, 161 {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, 162 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, 163 }; 164 165 static void __init scan_features(unsigned long node, unsigned char *ftrs, 166 unsigned long tablelen, 167 struct ibm_pa_feature *fp, 168 unsigned long ft_size) 169 { 170 unsigned long i, len, bit; 171 172 /* find descriptor with type == 0 */ 173 for (;;) { 174 if (tablelen < 3) 175 return; 176 len = 2 + ftrs[0]; 177 if (tablelen < len) 178 return; /* descriptor 0 not found */ 179 if (ftrs[1] == 0) 180 break; 181 tablelen -= len; 182 ftrs += len; 183 } 184 185 /* loop over bits we know about */ 186 for (i = 0; i < ft_size; ++i, ++fp) { 187 if (fp->pabyte >= ftrs[0]) 188 continue; 189 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; 190 if (bit ^ fp->invert) { 191 cur_cpu_spec->cpu_features |= fp->cpu_features; 192 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; 193 cur_cpu_spec->mmu_features |= fp->mmu_features; 194 } else { 195 cur_cpu_spec->cpu_features &= ~fp->cpu_features; 196 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; 197 cur_cpu_spec->mmu_features &= ~fp->mmu_features; 198 } 199 } 200 } 201 202 static void __init check_cpu_pa_features(unsigned long node) 203 { 204 unsigned char *pa_ftrs; 205 unsigned long tablelen; 206 207 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); 208 if (pa_ftrs == NULL) 209 return; 210 211 scan_features(node, pa_ftrs, tablelen, 212 ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); 213 } 214 215 #ifdef CONFIG_PPC_STD_MMU_64 216 static void __init check_cpu_slb_size(unsigned long node) 217 { 218 u32 *slb_size_ptr; 219 220 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL); 221 if (slb_size_ptr != NULL) { 222 mmu_slb_size = *slb_size_ptr; 223 return; 224 } 225 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL); 226 if (slb_size_ptr != NULL) { 227 mmu_slb_size = *slb_size_ptr; 228 } 229 } 230 #else 231 #define check_cpu_slb_size(node) do { } while(0) 232 #endif 233 234 static struct feature_property { 235 const char *name; 236 u32 min_value; 237 unsigned long cpu_feature; 238 unsigned long cpu_user_ftr; 239 } feature_properties[] __initdata = { 240 #ifdef CONFIG_ALTIVEC 241 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 242 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 243 #endif /* CONFIG_ALTIVEC */ 244 #ifdef CONFIG_VSX 245 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ 246 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, 247 #endif /* CONFIG_VSX */ 248 #ifdef CONFIG_PPC64 249 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, 250 {"ibm,purr", 1, CPU_FTR_PURR, 0}, 251 {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, 252 #endif /* CONFIG_PPC64 */ 253 }; 254 255 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) 256 static inline void identical_pvr_fixup(unsigned long node) 257 { 258 unsigned int pvr; 259 char *model = of_get_flat_dt_prop(node, "model", NULL); 260 261 /* 262 * Since 440GR(x)/440EP(x) processors have the same pvr, 263 * we check the node path and set bit 28 in the cur_cpu_spec 264 * pvr for EP(x) processor version. This bit is always 0 in 265 * the "real" pvr. Then we call identify_cpu again with 266 * the new logical pvr to enable FPU support. 267 */ 268 if (model && strstr(model, "440EP")) { 269 pvr = cur_cpu_spec->pvr_value | 0x8; 270 identify_cpu(0, pvr); 271 DBG("Using logical pvr %x for %s\n", pvr, model); 272 } 273 } 274 #else 275 #define identical_pvr_fixup(node) do { } while(0) 276 #endif 277 278 static void __init check_cpu_feature_properties(unsigned long node) 279 { 280 unsigned long i; 281 struct feature_property *fp = feature_properties; 282 const u32 *prop; 283 284 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { 285 prop = of_get_flat_dt_prop(node, fp->name, NULL); 286 if (prop && *prop >= fp->min_value) { 287 cur_cpu_spec->cpu_features |= fp->cpu_feature; 288 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; 289 } 290 } 291 } 292 293 static int __init early_init_dt_scan_cpus(unsigned long node, 294 const char *uname, int depth, 295 void *data) 296 { 297 char *type = of_get_flat_dt_prop(node, "device_type", NULL); 298 const u32 *prop; 299 const u32 *intserv; 300 int i, nthreads; 301 unsigned long len; 302 int found = -1; 303 int found_thread = 0; 304 305 /* We are scanning "cpu" nodes only */ 306 if (type == NULL || strcmp(type, "cpu") != 0) 307 return 0; 308 309 /* Get physical cpuid */ 310 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); 311 if (intserv) { 312 nthreads = len / sizeof(int); 313 } else { 314 intserv = of_get_flat_dt_prop(node, "reg", NULL); 315 nthreads = 1; 316 } 317 318 /* 319 * Now see if any of these threads match our boot cpu. 320 * NOTE: This must match the parsing done in smp_setup_cpu_maps. 321 */ 322 for (i = 0; i < nthreads; i++) { 323 /* 324 * version 2 of the kexec param format adds the phys cpuid of 325 * booted proc. 326 */ 327 if (initial_boot_params->version >= 2) { 328 if (intserv[i] == initial_boot_params->boot_cpuid_phys) { 329 found = boot_cpu_count; 330 found_thread = i; 331 } 332 } else { 333 /* 334 * Check if it's the boot-cpu, set it's hw index now, 335 * unfortunately this format did not support booting 336 * off secondary threads. 337 */ 338 if (of_get_flat_dt_prop(node, 339 "linux,boot-cpu", NULL) != NULL) 340 found = boot_cpu_count; 341 } 342 #ifdef CONFIG_SMP 343 /* logical cpu id is always 0 on UP kernels */ 344 boot_cpu_count++; 345 #endif 346 } 347 348 if (found >= 0) { 349 DBG("boot cpu: logical %d physical %d\n", found, 350 intserv[found_thread]); 351 boot_cpuid = found; 352 set_hard_smp_processor_id(found, intserv[found_thread]); 353 354 /* 355 * PAPR defines "logical" PVR values for cpus that 356 * meet various levels of the architecture: 357 * 0x0f000001 Architecture version 2.04 358 * 0x0f000002 Architecture version 2.05 359 * If the cpu-version property in the cpu node contains 360 * such a value, we call identify_cpu again with the 361 * logical PVR value in order to use the cpu feature 362 * bits appropriate for the architecture level. 363 * 364 * A POWER6 partition in "POWER6 architected" mode 365 * uses the 0x0f000002 PVR value; in POWER5+ mode 366 * it uses 0x0f000001. 367 */ 368 prop = of_get_flat_dt_prop(node, "cpu-version", NULL); 369 if (prop && (*prop & 0xff000000) == 0x0f000000) 370 identify_cpu(0, *prop); 371 372 identical_pvr_fixup(node); 373 } 374 375 check_cpu_feature_properties(node); 376 check_cpu_pa_features(node); 377 check_cpu_slb_size(node); 378 379 #ifdef CONFIG_PPC_PSERIES 380 if (nthreads > 1) 381 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 382 else 383 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 384 #endif 385 386 return 0; 387 } 388 389 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname, 390 int depth, void *data) 391 { 392 unsigned long *lprop; 393 394 /* Use common scan routine to determine if this is the chosen node */ 395 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) 396 return 0; 397 398 #ifdef CONFIG_PPC64 399 /* check if iommu is forced on or off */ 400 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) 401 iommu_is_off = 1; 402 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) 403 iommu_force_on = 1; 404 #endif 405 406 /* mem=x on the command line is the preferred mechanism */ 407 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); 408 if (lprop) 409 memory_limit = *lprop; 410 411 #ifdef CONFIG_PPC64 412 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); 413 if (lprop) 414 tce_alloc_start = *lprop; 415 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); 416 if (lprop) 417 tce_alloc_end = *lprop; 418 #endif 419 420 #ifdef CONFIG_KEXEC 421 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); 422 if (lprop) 423 crashk_res.start = *lprop; 424 425 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); 426 if (lprop) 427 crashk_res.end = crashk_res.start + *lprop - 1; 428 #endif 429 430 /* break now */ 431 return 1; 432 } 433 434 #ifdef CONFIG_PPC_PSERIES 435 /* 436 * Interpret the ibm,dynamic-memory property in the 437 * /ibm,dynamic-reconfiguration-memory node. 438 * This contains a list of memory blocks along with NUMA affinity 439 * information. 440 */ 441 static int __init early_init_dt_scan_drconf_memory(unsigned long node) 442 { 443 __be32 *dm, *ls, *usm; 444 unsigned long l, n, flags; 445 u64 base, size, memblock_size; 446 unsigned int is_kexec_kdump = 0, rngs; 447 448 ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l); 449 if (ls == NULL || l < dt_root_size_cells * sizeof(__be32)) 450 return 0; 451 memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls); 452 453 dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); 454 if (dm == NULL || l < sizeof(__be32)) 455 return 0; 456 457 n = *dm++; /* number of entries */ 458 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32)) 459 return 0; 460 461 /* check if this is a kexec/kdump kernel. */ 462 usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", 463 &l); 464 if (usm != NULL) 465 is_kexec_kdump = 1; 466 467 for (; n != 0; --n) { 468 base = dt_mem_next_cell(dt_root_addr_cells, &dm); 469 flags = dm[3]; 470 /* skip DRC index, pad, assoc. list index, flags */ 471 dm += 4; 472 /* skip this block if the reserved bit is set in flags (0x80) 473 or if the block is not assigned to this partition (0x8) */ 474 if ((flags & 0x80) || !(flags & 0x8)) 475 continue; 476 size = memblock_size; 477 rngs = 1; 478 if (is_kexec_kdump) { 479 /* 480 * For each memblock in ibm,dynamic-memory, a corresponding 481 * entry in linux,drconf-usable-memory property contains 482 * a counter 'p' followed by 'p' (base, size) duple. 483 * Now read the counter from 484 * linux,drconf-usable-memory property 485 */ 486 rngs = dt_mem_next_cell(dt_root_size_cells, &usm); 487 if (!rngs) /* there are no (base, size) duple */ 488 continue; 489 } 490 do { 491 if (is_kexec_kdump) { 492 base = dt_mem_next_cell(dt_root_addr_cells, 493 &usm); 494 size = dt_mem_next_cell(dt_root_size_cells, 495 &usm); 496 } 497 if (iommu_is_off) { 498 if (base >= 0x80000000ul) 499 continue; 500 if ((base + size) > 0x80000000ul) 501 size = 0x80000000ul - base; 502 } 503 memblock_add(base, size); 504 } while (--rngs); 505 } 506 memblock_dump_all(); 507 return 0; 508 } 509 #else 510 #define early_init_dt_scan_drconf_memory(node) 0 511 #endif /* CONFIG_PPC_PSERIES */ 512 513 static int __init early_init_dt_scan_memory_ppc(unsigned long node, 514 const char *uname, 515 int depth, void *data) 516 { 517 if (depth == 1 && 518 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) 519 return early_init_dt_scan_drconf_memory(node); 520 521 return early_init_dt_scan_memory(node, uname, depth, data); 522 } 523 524 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 525 { 526 #ifdef CONFIG_PPC64 527 if (iommu_is_off) { 528 if (base >= 0x80000000ul) 529 return; 530 if ((base + size) > 0x80000000ul) 531 size = 0x80000000ul - base; 532 } 533 #endif 534 /* Keep track of the beginning of memory -and- the size of 535 * the very first block in the device-tree as it represents 536 * the RMA on ppc64 server 537 */ 538 if (base < memstart_addr) { 539 memstart_addr = base; 540 first_memblock_size = size; 541 } 542 543 /* Add the chunk to the MEMBLOCK list */ 544 memblock_add(base, size); 545 } 546 547 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 548 { 549 return __va(memblock_alloc(size, align)); 550 } 551 552 #ifdef CONFIG_BLK_DEV_INITRD 553 void __init early_init_dt_setup_initrd_arch(unsigned long start, 554 unsigned long end) 555 { 556 initrd_start = (unsigned long)__va(start); 557 initrd_end = (unsigned long)__va(end); 558 initrd_below_start_ok = 1; 559 } 560 #endif 561 562 static bool __init early_reserve_mem_dt(void) 563 { 564 unsigned long i, len, dt_root; 565 const __be32 *prop; 566 567 dt_root = of_get_flat_dt_root(); 568 569 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); 570 571 if (!prop) 572 return false; 573 574 /* Each reserved range is an (address,size) pair, 2 cells each, 575 * totalling 4 cells per range. */ 576 for (i = 0; i < len / (sizeof(*prop) * 4); i++) { 577 u64 base, size; 578 579 base = of_read_number(prop + (i * 4) + 0, 2); 580 size = of_read_number(prop + (i * 4) + 2, 2); 581 582 if (size) 583 memblock_reserve(base, size); 584 } 585 586 return true; 587 } 588 589 static void __init early_reserve_mem(void) 590 { 591 u64 base, size; 592 u64 *reserve_map; 593 unsigned long self_base; 594 unsigned long self_size; 595 596 reserve_map = (u64 *)(((unsigned long)initial_boot_params) + 597 initial_boot_params->off_mem_rsvmap); 598 599 /* before we do anything, lets reserve the dt blob */ 600 self_base = __pa((unsigned long)initial_boot_params); 601 self_size = initial_boot_params->totalsize; 602 memblock_reserve(self_base, self_size); 603 604 /* 605 * Try looking for reserved-regions property in the DT first; if 606 * it's present, it'll contain all of the necessary reservation 607 * info 608 */ 609 if (early_reserve_mem_dt()) 610 return; 611 612 #ifdef CONFIG_BLK_DEV_INITRD 613 /* then reserve the initrd, if any */ 614 if (initrd_start && (initrd_end > initrd_start)) 615 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), 616 _ALIGN_UP(initrd_end, PAGE_SIZE) - 617 _ALIGN_DOWN(initrd_start, PAGE_SIZE)); 618 #endif /* CONFIG_BLK_DEV_INITRD */ 619 620 #ifdef CONFIG_PPC32 621 /* 622 * Handle the case where we might be booting from an old kexec 623 * image that setup the mem_rsvmap as pairs of 32-bit values 624 */ 625 if (*reserve_map > 0xffffffffull) { 626 u32 base_32, size_32; 627 u32 *reserve_map_32 = (u32 *)reserve_map; 628 629 while (1) { 630 base_32 = *(reserve_map_32++); 631 size_32 = *(reserve_map_32++); 632 if (size_32 == 0) 633 break; 634 /* skip if the reservation is for the blob */ 635 if (base_32 == self_base && size_32 == self_size) 636 continue; 637 DBG("reserving: %x -> %x\n", base_32, size_32); 638 memblock_reserve(base_32, size_32); 639 } 640 return; 641 } 642 #endif 643 while (1) { 644 base = *(reserve_map++); 645 size = *(reserve_map++); 646 if (size == 0) 647 break; 648 DBG("reserving: %llx -> %llx\n", base, size); 649 memblock_reserve(base, size); 650 } 651 } 652 653 void __init early_init_devtree(void *params) 654 { 655 phys_addr_t limit; 656 657 DBG(" -> early_init_devtree(%p)\n", params); 658 659 /* Setup flat device-tree pointer */ 660 initial_boot_params = params; 661 662 #ifdef CONFIG_PPC_RTAS 663 /* Some machines might need RTAS info for debugging, grab it now. */ 664 of_scan_flat_dt(early_init_dt_scan_rtas, NULL); 665 #endif 666 667 #ifdef CONFIG_PPC_POWERNV 668 /* Some machines might need OPAL info for debugging, grab it now. */ 669 of_scan_flat_dt(early_init_dt_scan_opal, NULL); 670 #endif 671 672 #ifdef CONFIG_FA_DUMP 673 /* scan tree to see if dump is active during last boot */ 674 of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); 675 #endif 676 677 /* Pre-initialize the cmd_line with the content of boot_commmand_line, 678 * which will be empty except when the content of the variable has 679 * been overriden by a bootloading mechanism. This happens typically 680 * with HAL takeover 681 */ 682 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); 683 684 /* Retrieve various informations from the /chosen node of the 685 * device-tree, including the platform type, initrd location and 686 * size, TCE reserve, and more ... 687 */ 688 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line); 689 690 /* Scan memory nodes and rebuild MEMBLOCKs */ 691 of_scan_flat_dt(early_init_dt_scan_root, NULL); 692 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); 693 694 /* Save command line for /proc/cmdline and then parse parameters */ 695 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); 696 parse_early_param(); 697 698 /* make sure we've parsed cmdline for mem= before this */ 699 if (memory_limit) 700 first_memblock_size = min_t(u64, first_memblock_size, memory_limit); 701 setup_initial_memory_limit(memstart_addr, first_memblock_size); 702 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ 703 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); 704 /* If relocatable, reserve first 32k for interrupt vectors etc. */ 705 if (PHYSICAL_START > MEMORY_START) 706 memblock_reserve(MEMORY_START, 0x8000); 707 reserve_kdump_trampoline(); 708 #ifdef CONFIG_FA_DUMP 709 /* 710 * If we fail to reserve memory for firmware-assisted dump then 711 * fallback to kexec based kdump. 712 */ 713 if (fadump_reserve_mem() == 0) 714 #endif 715 reserve_crashkernel(); 716 early_reserve_mem(); 717 718 /* 719 * Ensure that total memory size is page-aligned, because otherwise 720 * mark_bootmem() gets upset. 721 */ 722 limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); 723 memblock_enforce_memory_limit(limit); 724 725 memblock_allow_resize(); 726 memblock_dump_all(); 727 728 DBG("Phys. mem: %llx\n", memblock_phys_mem_size()); 729 730 /* We may need to relocate the flat tree, do it now. 731 * FIXME .. and the initrd too? */ 732 move_device_tree(); 733 734 allocate_pacas(); 735 736 DBG("Scanning CPUs ...\n"); 737 738 /* Retrieve CPU related informations from the flat tree 739 * (altivec support, boot CPU ID, ...) 740 */ 741 of_scan_flat_dt(early_init_dt_scan_cpus, NULL); 742 743 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) 744 /* We'll later wait for secondaries to check in; there are 745 * NCPUS-1 non-boot CPUs :-) 746 */ 747 spinning_secondaries = boot_cpu_count - 1; 748 #endif 749 750 DBG(" <- early_init_devtree()\n"); 751 } 752 753 /******* 754 * 755 * New implementation of the OF "find" APIs, return a refcounted 756 * object, call of_node_put() when done. The device tree and list 757 * are protected by a rw_lock. 758 * 759 * Note that property management will need some locking as well, 760 * this isn't dealt with yet. 761 * 762 *******/ 763 764 /** 765 * of_find_next_cache_node - Find a node's subsidiary cache 766 * @np: node of type "cpu" or "cache" 767 * 768 * Returns a node pointer with refcount incremented, use 769 * of_node_put() on it when done. Caller should hold a reference 770 * to np. 771 */ 772 struct device_node *of_find_next_cache_node(struct device_node *np) 773 { 774 struct device_node *child; 775 const phandle *handle; 776 777 handle = of_get_property(np, "l2-cache", NULL); 778 if (!handle) 779 handle = of_get_property(np, "next-level-cache", NULL); 780 781 if (handle) 782 return of_find_node_by_phandle(*handle); 783 784 /* OF on pmac has nodes instead of properties named "l2-cache" 785 * beneath CPU nodes. 786 */ 787 if (!strcmp(np->type, "cpu")) 788 for_each_child_of_node(np, child) 789 if (!strcmp(child->type, "cache")) 790 return child; 791 792 return NULL; 793 } 794 795 #ifdef CONFIG_PPC_PSERIES 796 /* 797 * Fix up the uninitialized fields in a new device node: 798 * name, type and pci-specific fields 799 */ 800 801 static int of_finish_dynamic_node(struct device_node *node) 802 { 803 struct device_node *parent = of_get_parent(node); 804 int err = 0; 805 const phandle *ibm_phandle; 806 807 node->name = of_get_property(node, "name", NULL); 808 node->type = of_get_property(node, "device_type", NULL); 809 810 if (!node->name) 811 node->name = "<NULL>"; 812 if (!node->type) 813 node->type = "<NULL>"; 814 815 if (!parent) { 816 err = -ENODEV; 817 goto out; 818 } 819 820 /* We don't support that function on PowerMac, at least 821 * not yet 822 */ 823 if (machine_is(powermac)) 824 return -ENODEV; 825 826 /* fix up new node's phandle field */ 827 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL))) 828 node->phandle = *ibm_phandle; 829 830 out: 831 of_node_put(parent); 832 return err; 833 } 834 835 static int prom_reconfig_notifier(struct notifier_block *nb, 836 unsigned long action, void *node) 837 { 838 int err; 839 840 switch (action) { 841 case OF_RECONFIG_ATTACH_NODE: 842 err = of_finish_dynamic_node(node); 843 if (err < 0) 844 printk(KERN_ERR "finish_node returned %d\n", err); 845 break; 846 default: 847 err = 0; 848 break; 849 } 850 return notifier_from_errno(err); 851 } 852 853 static struct notifier_block prom_reconfig_nb = { 854 .notifier_call = prom_reconfig_notifier, 855 .priority = 10, /* This one needs to run first */ 856 }; 857 858 static int __init prom_reconfig_setup(void) 859 { 860 return of_reconfig_notifier_register(&prom_reconfig_nb); 861 } 862 __initcall(prom_reconfig_setup); 863 #endif 864 865 /* Find the device node for a given logical cpu number, also returns the cpu 866 * local thread number (index in ibm,interrupt-server#s) if relevant and 867 * asked for (non NULL) 868 */ 869 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) 870 { 871 int hardid; 872 struct device_node *np; 873 874 hardid = get_hard_smp_processor_id(cpu); 875 876 for_each_node_by_type(np, "cpu") { 877 const u32 *intserv; 878 unsigned int plen, t; 879 880 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist 881 * fallback to "reg" property and assume no threads 882 */ 883 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", 884 &plen); 885 if (intserv == NULL) { 886 const u32 *reg = of_get_property(np, "reg", NULL); 887 if (reg == NULL) 888 continue; 889 if (*reg == hardid) { 890 if (thread) 891 *thread = 0; 892 return np; 893 } 894 } else { 895 plen /= sizeof(u32); 896 for (t = 0; t < plen; t++) { 897 if (hardid == intserv[t]) { 898 if (thread) 899 *thread = t; 900 return np; 901 } 902 } 903 } 904 } 905 return NULL; 906 } 907 EXPORT_SYMBOL(of_get_cpu_node); 908 909 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) 910 static struct debugfs_blob_wrapper flat_dt_blob; 911 912 static int __init export_flat_device_tree(void) 913 { 914 struct dentry *d; 915 916 flat_dt_blob.data = initial_boot_params; 917 flat_dt_blob.size = initial_boot_params->totalsize; 918 919 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, 920 powerpc_debugfs_root, &flat_dt_blob); 921 if (!d) 922 return 1; 923 924 return 0; 925 } 926 __initcall(export_flat_device_tree); 927 #endif 928