arch/powerpc/kernel/prom.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  *      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/irq.h>
  33 #include <linux/memblock.h>
  34 #include <linux/of.h>
  35 #include <linux/of_fdt.h>
  36 #include <linux/libfdt.h>
  37
  38 #include <asm/prom.h>
  39 #include <asm/rtas.h>
  40 #include <asm/page.h>
  41 #include <asm/processor.h>
  42 #include <asm/irq.h>
  43 #include <asm/io.h>
  44 #include <asm/kdump.h>
  45 #include <asm/smp.h>
  46 #include <asm/mmu.h>
  47 #include <asm/paca.h>
  48 #include <asm/pgtable.h>
  49 #include <asm/pci.h>
  50 #include <asm/iommu.h>
  51 #include <asm/btext.h>
  52 #include <asm/sections.h>
  53 #include <asm/machdep.h>
  54 #include <asm/pci-bridge.h>
  55 #include <asm/kexec.h>
  56 #include <asm/opal.h>
  57 #include <asm/fadump.h>
  58 #include <asm/debug.h>
  59
  60 #include <mm/mmu_decl.h>
  61
  62 #ifdef DEBUG
  63 #define DBG(fmt...) printk(KERN_ERR fmt)
  64 #else
  65 #define DBG(fmt...)
  66 #endif
  67
  68 #ifdef CONFIG_PPC64
  69 int __initdata iommu_is_off;
  70 int __initdata iommu_force_on;
  71 unsigned long tce_alloc_start, tce_alloc_end;
  72 u64 ppc64_rma_size;
  73 #endif
  74 static phys_addr_t first_memblock_size;
  75 static int __initdata boot_cpu_count;
  76
  77 static int __init early_parse_mem(char *p)
  78 {
  79         if (!p)
  80                 return 1;
  81
  82         memory_limit = PAGE_ALIGN(memparse(p, &p));
  83         DBG("memory limit = 0x%llx\n", memory_limit);
  84
  85         return 0;
  86 }
  87 early_param("mem", early_parse_mem);
  88
  89 /*
  90  * overlaps_initrd - check for overlap with page aligned extension of
  91  * initrd.
  92  */
  93 static inline int overlaps_initrd(unsigned long start, unsigned long size)
  94 {
  95 #ifdef CONFIG_BLK_DEV_INITRD
  96         if (!initrd_start)
  97                 return 0;
  98
  99         return  (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
 100                         start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
 101 #else
 102         return 0;
 103 #endif
 104 }
 105
 106 /**
 107  * move_device_tree - move tree to an unused area, if needed.
 108  *
 109  * The device tree may be allocated beyond our memory limit, or inside the
 110  * crash kernel region for kdump, or within the page aligned range of initrd.
 111  * If so, move it out of the way.
 112  */
 113 static void __init move_device_tree(void)
 114 {
 115         unsigned long start, size;
 116         void *p;
 117
 118         DBG("-> move_device_tree\n");
 119
 120         start = __pa(initial_boot_params);
 121         size = fdt_totalsize(initial_boot_params);
 122
 123         if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
 124                         overlaps_crashkernel(start, size) ||
 125                         overlaps_initrd(start, size)) {
 126                 p = __va(memblock_alloc(size, PAGE_SIZE));
 127                 memcpy(p, initial_boot_params, size);
 128                 initial_boot_params = p;
 129                 DBG("Moved device tree to 0x%p\n", p);
 130         }
 131
 132         DBG("<- move_device_tree\n");
 133 }
 134
 135 /*
 136  * ibm,pa-features is a per-cpu property that contains a string of
 137  * attribute descriptors, each of which has a 2 byte header plus up
 138  * to 254 bytes worth of processor attribute bits.  First header
 139  * byte specifies the number of bytes following the header.
 140  * Second header byte is an "attribute-specifier" type, of which
 141  * zero is the only currently-defined value.
 142  * Implementation:  Pass in the byte and bit offset for the feature
 143  * that we are interested in.  The function will return -1 if the
 144  * pa-features property is missing, or a 1/0 to indicate if the feature
 145  * is supported/not supported.  Note that the bit numbers are
 146  * big-endian to match the definition in PAPR.
 147  */
 148 static struct ibm_pa_feature {
 149         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
 150         unsigned long   mmu_features;   /* MMU_FTR_xxx bit */
 151         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
 152         unsigned char   pabyte;         /* byte number in ibm,pa-features */
 153         unsigned char   pabit;          /* bit number (big-endian) */
 154         unsigned char   invert;         /* if 1, pa bit set => clear feature */
 155 } ibm_pa_features[] __initdata = {
 156         {0, 0, PPC_FEATURE_HAS_MMU,     0, 0, 0},
 157         {0, 0, PPC_FEATURE_HAS_FPU,     0, 1, 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          * If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n),
 165          * we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP
 166          * which is 0 if the kernel doesn't support TM.
 167          */
 168         {CPU_FTR_TM_COMP, 0, 0,         22, 0, 0},
 169 };
 170
 171 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
 172                                  unsigned long tablelen,
 173                                  struct ibm_pa_feature *fp,
 174                                  unsigned long ft_size)
 175 {
 176         unsigned long i, len, bit;
 177
 178         /* find descriptor with type == 0 */
 179         for (;;) {
 180                 if (tablelen < 3)
 181                         return;
 182                 len = 2 + ftrs[0];
 183                 if (tablelen < len)
 184                         return;         /* descriptor 0 not found */
 185                 if (ftrs[1] == 0)
 186                         break;
 187                 tablelen -= len;
 188                 ftrs += len;
 189         }
 190
 191         /* loop over bits we know about */
 192         for (i = 0; i < ft_size; ++i, ++fp) {
 193                 if (fp->pabyte >= ftrs[0])
 194                         continue;
 195                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
 196                 if (bit ^ fp->invert) {
 197                         cur_cpu_spec->cpu_features |= fp->cpu_features;
 198                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
 199                         cur_cpu_spec->mmu_features |= fp->mmu_features;
 200                 } else {
 201                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
 202                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
 203                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
 204                 }
 205         }
 206 }
 207
 208 static void __init check_cpu_pa_features(unsigned long node)
 209 {
 210         const unsigned char *pa_ftrs;
 211         int tablelen;
 212
 213         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
 214         if (pa_ftrs == NULL)
 215                 return;
 216
 217         scan_features(node, pa_ftrs, tablelen,
 218                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 219 }
 220
 221 #ifdef CONFIG_PPC_STD_MMU_64
 222 static void __init check_cpu_slb_size(unsigned long node)
 223 {
 224         const __be32 *slb_size_ptr;
 225
 226         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
 227         if (slb_size_ptr != NULL) {
 228                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 229                 return;
 230         }
 231         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 232         if (slb_size_ptr != NULL) {
 233                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 234         }
 235 }
 236 #else
 237 #define check_cpu_slb_size(node) do { } while(0)
 238 #endif
 239
 240 static struct feature_property {
 241         const char *name;
 242         u32 min_value;
 243         unsigned long cpu_feature;
 244         unsigned long cpu_user_ftr;
 245 } feature_properties[] __initdata = {
 246 #ifdef CONFIG_ALTIVEC
 247         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 248         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 249 #endif /* CONFIG_ALTIVEC */
 250 #ifdef CONFIG_VSX
 251         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
 252         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
 253 #endif /* CONFIG_VSX */
 254 #ifdef CONFIG_PPC64
 255         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
 256         {"ibm,purr", 1, CPU_FTR_PURR, 0},
 257         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
 258 #endif /* CONFIG_PPC64 */
 259 };
 260
 261 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
 262 static inline void identical_pvr_fixup(unsigned long node)
 263 {
 264         unsigned int pvr;
 265         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 266
 267         /*
 268          * Since 440GR(x)/440EP(x) processors have the same pvr,
 269          * we check the node path and set bit 28 in the cur_cpu_spec
 270          * pvr for EP(x) processor version. This bit is always 0 in
 271          * the "real" pvr. Then we call identify_cpu again with
 272          * the new logical pvr to enable FPU support.
 273          */
 274         if (model && strstr(model, "440EP")) {
 275                 pvr = cur_cpu_spec->pvr_value | 0x8;
 276                 identify_cpu(0, pvr);
 277                 DBG("Using logical pvr %x for %s\n", pvr, model);
 278         }
 279 }
 280 #else
 281 #define identical_pvr_fixup(node) do { } while(0)
 282 #endif
 283
 284 static void __init check_cpu_feature_properties(unsigned long node)
 285 {
 286         unsigned long i;
 287         struct feature_property *fp = feature_properties;
 288         const __be32 *prop;
 289
 290         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
 291                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
 292                 if (prop && be32_to_cpup(prop) >= fp->min_value) {
 293                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
 294                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
 295                 }
 296         }
 297 }
 298
 299 static int __init early_init_dt_scan_cpus(unsigned long node,
 300                                           const char *uname, int depth,
 301                                           void *data)
 302 {
 303         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 304         const __be32 *prop;
 305         const __be32 *intserv;
 306         int i, nthreads;
 307         int len;
 308         int found = -1;
 309         int found_thread = 0;
 310
 311         /* We are scanning "cpu" nodes only */
 312         if (type == NULL || strcmp(type, "cpu") != 0)
 313                 return 0;
 314
 315         /* Get physical cpuid */
 316         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
 317         if (!intserv)
 318                 intserv = of_get_flat_dt_prop(node, "reg", &len);
 319
 320         nthreads = len / sizeof(int);
 321
 322         /*
 323          * Now see if any of these threads match our boot cpu.
 324          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 325          */
 326         for (i = 0; i < nthreads; i++) {
 327                 /*
 328                  * version 2 of the kexec param format adds the phys cpuid of
 329                  * booted proc.
 330                  */
 331                 if (fdt_version(initial_boot_params) >= 2) {
 332                         if (be32_to_cpu(intserv[i]) ==
 333                             fdt_boot_cpuid_phys(initial_boot_params)) {
 334                                 found = boot_cpu_count;
 335                                 found_thread = i;
 336                         }
 337                 } else {
 338                         /*
 339                          * Check if it's the boot-cpu, set it's hw index now,
 340                          * unfortunately this format did not support booting
 341                          * off secondary threads.
 342                          */
 343                         if (of_get_flat_dt_prop(node,
 344                                         "linux,boot-cpu", NULL) != NULL)
 345                                 found = boot_cpu_count;
 346                 }
 347 #ifdef CONFIG_SMP
 348                 /* logical cpu id is always 0 on UP kernels */
 349                 boot_cpu_count++;
 350 #endif
 351         }
 352
 353         /* Not the boot CPU */
 354         if (found < 0)
 355                 return 0;
 356
 357         DBG("boot cpu: logical %d physical %d\n", found,
 358             be32_to_cpu(intserv[found_thread]));
 359         boot_cpuid = found;
 360         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 361
 362         /*
 363          * PAPR defines "logical" PVR values for cpus that
 364          * meet various levels of the architecture:
 365          * 0x0f000001   Architecture version 2.04
 366          * 0x0f000002   Architecture version 2.05
 367          * If the cpu-version property in the cpu node contains
 368          * such a value, we call identify_cpu again with the
 369          * logical PVR value in order to use the cpu feature
 370          * bits appropriate for the architecture level.
 371          *
 372          * A POWER6 partition in "POWER6 architected" mode
 373          * uses the 0x0f000002 PVR value; in POWER5+ mode
 374          * it uses 0x0f000001.
 375          */
 376         prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 377         if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
 378                 identify_cpu(0, be32_to_cpup(prop));
 379
 380         identical_pvr_fixup(node);
 381
 382         check_cpu_feature_properties(node);
 383         check_cpu_pa_features(node);
 384         check_cpu_slb_size(node);
 385
 386 #ifdef CONFIG_PPC64
 387         if (nthreads > 1)
 388                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 389         else
 390                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 391 #endif
 392         return 0;
 393 }
 394
 395 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 396                                                 const char *uname,
 397                                                 int depth, void *data)
 398 {
 399         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
 400
 401         /* Use common scan routine to determine if this is the chosen node */
 402         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
 403                 return 0;
 404
 405 #ifdef CONFIG_PPC64
 406         /* check if iommu is forced on or off */
 407         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 408                 iommu_is_off = 1;
 409         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 410                 iommu_force_on = 1;
 411 #endif
 412
 413         /* mem=x on the command line is the preferred mechanism */
 414         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 415         if (lprop)
 416                 memory_limit = *lprop;
 417
 418 #ifdef CONFIG_PPC64
 419         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 420         if (lprop)
 421                 tce_alloc_start = *lprop;
 422         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 423         if (lprop)
 424                 tce_alloc_end = *lprop;
 425 #endif
 426
 427 #ifdef CONFIG_KEXEC
 428         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 429         if (lprop)
 430                 crashk_res.start = *lprop;
 431
 432         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 433         if (lprop)
 434                 crashk_res.end = crashk_res.start + *lprop - 1;
 435 #endif
 436
 437         /* break now */
 438         return 1;
 439 }
 440
 441 #ifdef CONFIG_PPC_PSERIES
 442 /*
 443  * Interpret the ibm,dynamic-memory property in the
 444  * /ibm,dynamic-reconfiguration-memory node.
 445  * This contains a list of memory blocks along with NUMA affinity
 446  * information.
 447  */
 448 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 449 {
 450         const __be32 *dm, *ls, *usm;
 451         int l;
 452         unsigned long n, flags;
 453         u64 base, size, memblock_size;
 454         unsigned int is_kexec_kdump = 0, rngs;
 455
 456         ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
 457         if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
 458                 return 0;
 459         memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
 460
 461         dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 462         if (dm == NULL || l < sizeof(__be32))
 463                 return 0;
 464
 465         n = of_read_number(dm++, 1);    /* number of entries */
 466         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
 467                 return 0;
 468
 469         /* check if this is a kexec/kdump kernel. */
 470         usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
 471                                                  &l);
 472         if (usm != NULL)
 473                 is_kexec_kdump = 1;
 474
 475         for (; n != 0; --n) {
 476                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
 477                 flags = of_read_number(&dm[3], 1);
 478                 /* skip DRC index, pad, assoc. list index, flags */
 479                 dm += 4;
 480                 /* skip this block if the reserved bit is set in flags (0x80)
 481                    or if the block is not assigned to this partition (0x8) */
 482                 if ((flags & 0x80) || !(flags & 0x8))
 483                         continue;
 484                 size = memblock_size;
 485                 rngs = 1;
 486                 if (is_kexec_kdump) {
 487                         /*
 488                          * For each memblock in ibm,dynamic-memory, a corresponding
 489                          * entry in linux,drconf-usable-memory property contains
 490                          * a counter 'p' followed by 'p' (base, size) duple.
 491                          * Now read the counter from
 492                          * linux,drconf-usable-memory property
 493                          */
 494                         rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
 495                         if (!rngs) /* there are no (base, size) duple */
 496                                 continue;
 497                 }
 498                 do {
 499                         if (is_kexec_kdump) {
 500                                 base = dt_mem_next_cell(dt_root_addr_cells,
 501                                                          &usm);
 502                                 size = dt_mem_next_cell(dt_root_size_cells,
 503                                                          &usm);
 504                         }
 505                         if (iommu_is_off) {
 506                                 if (base >= 0x80000000ul)
 507                                         continue;
 508                                 if ((base + size) > 0x80000000ul)
 509                                         size = 0x80000000ul - base;
 510                         }
 511                         memblock_add(base, size);
 512                 } while (--rngs);
 513         }
 514         memblock_dump_all();
 515         return 0;
 516 }
 517 #else
 518 #define early_init_dt_scan_drconf_memory(node)  0
 519 #endif /* CONFIG_PPC_PSERIES */
 520
 521 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 522                                                 const char *uname,
 523                                                 int depth, void *data)
 524 {
 525         if (depth == 1 &&
 526             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 527                 return early_init_dt_scan_drconf_memory(node);
 528
 529         return early_init_dt_scan_memory(node, uname, depth, data);
 530 }
 531
 532 /*
 533  * For a relocatable kernel, we need to get the memstart_addr first,
 534  * then use it to calculate the virtual kernel start address. This has
 535  * to happen at a very early stage (before machine_init). In this case,
 536  * we just want to get the memstart_address and would not like to mess the
 537  * memblock at this stage. So introduce a variable to skip the memblock_add()
 538  * for this reason.
 539  */
 540 #ifdef CONFIG_RELOCATABLE
 541 static int add_mem_to_memblock = 1;
 542 #else
 543 #define add_mem_to_memblock 1
 544 #endif
 545
 546 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 547 {
 548 #ifdef CONFIG_PPC64
 549         if (iommu_is_off) {
 550                 if (base >= 0x80000000ul)
 551                         return;
 552                 if ((base + size) > 0x80000000ul)
 553                         size = 0x80000000ul - base;
 554         }
 555 #endif
 556         /* Keep track of the beginning of memory -and- the size of
 557          * the very first block in the device-tree as it represents
 558          * the RMA on ppc64 server
 559          */
 560         if (base < memstart_addr) {
 561                 memstart_addr = base;
 562                 first_memblock_size = size;
 563         }
 564
 565         /* Add the chunk to the MEMBLOCK list */
 566         if (add_mem_to_memblock)
 567                 memblock_add(base, size);
 568 }
 569
 570 static void __init early_reserve_mem_dt(void)
 571 {
 572         unsigned long i, dt_root;
 573         int len;
 574         const __be32 *prop;
 575
 576         early_init_fdt_scan_reserved_mem();
 577
 578         dt_root = of_get_flat_dt_root();
 579
 580         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
 581
 582         if (!prop)
 583                 return;
 584
 585         DBG("Found new-style reserved-ranges\n");
 586
 587         /* Each reserved range is an (address,size) pair, 2 cells each,
 588          * totalling 4 cells per range. */
 589         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
 590                 u64 base, size;
 591
 592                 base = of_read_number(prop + (i * 4) + 0, 2);
 593                 size = of_read_number(prop + (i * 4) + 2, 2);
 594
 595                 if (size) {
 596                         DBG("reserving: %llx -> %llx\n", base, size);
 597                         memblock_reserve(base, size);
 598                 }
 599         }
 600 }
 601
 602 static void __init early_reserve_mem(void)
 603 {
 604         __be64 *reserve_map;
 605
 606         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
 607                         fdt_off_mem_rsvmap(initial_boot_params));
 608
 609         /* Look for the new "reserved-regions" property in the DT */
 610         early_reserve_mem_dt();
 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         }
 619 #endif /* CONFIG_BLK_DEV_INITRD */
 620
 621 #ifdef CONFIG_PPC32
 622         /*
 623          * Handle the case where we might be booting from an old kexec
 624          * image that setup the mem_rsvmap as pairs of 32-bit values
 625          */
 626         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
 627                 u32 base_32, size_32;
 628                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
 629
 630                 DBG("Found old 32-bit reserve map\n");
 631
 632                 while (1) {
 633                         base_32 = be32_to_cpup(reserve_map_32++);
 634                         size_32 = be32_to_cpup(reserve_map_32++);
 635                         if (size_32 == 0)
 636                                 break;
 637                         DBG("reserving: %x -> %x\n", base_32, size_32);
 638                         memblock_reserve(base_32, size_32);
 639                 }
 640                 return;
 641         }
 642 #endif
 643 }
 644
 645 void __init early_init_devtree(void *params)
 646 {
 647         phys_addr_t limit;
 648
 649         DBG(" -> early_init_devtree(%p)\n", params);
 650
 651         /* Too early to BUG_ON(), do it by hand */
 652         if (!early_init_dt_verify(params))
 653                 panic("BUG: Failed verifying flat device tree, bad version?");
 654
 655 #ifdef CONFIG_PPC_RTAS
 656         /* Some machines might need RTAS info for debugging, grab it now. */
 657         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
 658 #endif
 659
 660 #ifdef CONFIG_PPC_POWERNV
 661         /* Some machines might need OPAL info for debugging, grab it now. */
 662         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
 663 #endif
 664
 665 #ifdef CONFIG_FA_DUMP
 666         /* scan tree to see if dump is active during last boot */
 667         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
 668 #endif
 669
 670         /* Retrieve various informations from the /chosen node of the
 671          * device-tree, including the platform type, initrd location and
 672          * size, TCE reserve, and more ...
 673          */
 674         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 675
 676         /* Scan memory nodes and rebuild MEMBLOCKs */
 677         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 678         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 679
 680         parse_early_param();
 681
 682         /* make sure we've parsed cmdline for mem= before this */
 683         if (memory_limit)
 684                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
 685         setup_initial_memory_limit(memstart_addr, first_memblock_size);
 686         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
 687         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
 688         /* If relocatable, reserve first 32k for interrupt vectors etc. */
 689         if (PHYSICAL_START > MEMORY_START)
 690                 memblock_reserve(MEMORY_START, 0x8000);
 691         reserve_kdump_trampoline();
 692 #ifdef CONFIG_FA_DUMP
 693         /*
 694          * If we fail to reserve memory for firmware-assisted dump then
 695          * fallback to kexec based kdump.
 696          */
 697         if (fadump_reserve_mem() == 0)
 698 #endif
 699                 reserve_crashkernel();
 700         early_reserve_mem();
 701
 702         /* Ensure that total memory size is page-aligned. */
 703         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
 704         memblock_enforce_memory_limit(limit);
 705
 706         memblock_allow_resize();
 707         memblock_dump_all();
 708
 709         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
 710
 711         /* We may need to relocate the flat tree, do it now.
 712          * FIXME .. and the initrd too? */
 713         move_device_tree();
 714
 715         allocate_pacas();
 716
 717         DBG("Scanning CPUs ...\n");
 718
 719         /* Retrieve CPU related informations from the flat tree
 720          * (altivec support, boot CPU ID, ...)
 721          */
 722         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 723         if (boot_cpuid < 0) {
 724                 printk("Failed to identify boot CPU !\n");
 725                 BUG();
 726         }
 727
 728 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
 729         /* We'll later wait for secondaries to check in; there are
 730          * NCPUS-1 non-boot CPUs  :-)
 731          */
 732         spinning_secondaries = boot_cpu_count - 1;
 733 #endif
 734
 735 #ifdef CONFIG_PPC_POWERNV
 736         /* Scan and build the list of machine check recoverable ranges */
 737         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
 738 #endif
 739
 740         DBG(" <- early_init_devtree()\n");
 741 }
 742
 743 #ifdef CONFIG_RELOCATABLE
 744 /*
 745  * This function run before early_init_devtree, so we have to init
 746  * initial_boot_params.
 747  */
 748 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
 749 {
 750         /* Setup flat device-tree pointer */
 751         initial_boot_params = params;
 752
 753         /*
 754          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
 755          * mess the memblock.
 756          */
 757         add_mem_to_memblock = 0;
 758         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 759         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 760         add_mem_to_memblock = 1;
 761
 762         if (size)
 763                 *size = first_memblock_size;
 764 }
 765 #endif
 766
 767 /*******
 768  *
 769  * New implementation of the OF "find" APIs, return a refcounted
 770  * object, call of_node_put() when done.  The device tree and list
 771  * are protected by a rw_lock.
 772  *
 773  * Note that property management will need some locking as well,
 774  * this isn't dealt with yet.
 775  *
 776  *******/
 777
 778 /**
 779  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
 780  * @np: device node of the device
 781  *
 782  * This looks for a property "ibm,chip-id" in the node or any
 783  * of its parents and returns its content, or -1 if it cannot
 784  * be found.
 785  */
 786 int of_get_ibm_chip_id(struct device_node *np)
 787 {
 788         of_node_get(np);
 789         while(np) {
 790                 struct device_node *old = np;
 791                 const __be32 *prop;
 792
 793                 prop = of_get_property(np, "ibm,chip-id", NULL);
 794                 if (prop) {
 795                         of_node_put(np);
 796                         return be32_to_cpup(prop);
 797                 }
 798                 np = of_get_parent(np);
 799                 of_node_put(old);
 800         }
 801         return -1;
 802 }
 803
 804 /**
 805  * cpu_to_chip_id - Return the cpus chip-id
 806  * @cpu: The logical cpu number.
 807  *
 808  * Return the value of the ibm,chip-id property corresponding to the given
 809  * logical cpu number. If the chip-id can not be found, returns -1.
 810  */
 811 int cpu_to_chip_id(int cpu)
 812 {
 813         struct device_node *np;
 814
 815         np = of_get_cpu_node(cpu, NULL);
 816         if (!np)
 817                 return -1;
 818
 819         of_node_put(np);
 820         return of_get_ibm_chip_id(np);
 821 }
 822 EXPORT_SYMBOL(cpu_to_chip_id);
 823
 824 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 825 {
 826         return (int)phys_id == get_hard_smp_processor_id(cpu);
 827 }