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/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 = fdt_totalsize(initial_boot_params);
 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 = 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         {CPU_FTR_CTRL, 0, 0,            0, 3, 0},
 158         {CPU_FTR_NOEXECUTE, 0, 0,       0, 6, 0},
 159         {CPU_FTR_NODSISRALIGN, 0, 0,    1, 1, 1},
 160         {0, MMU_FTR_CI_LARGE_PAGE, 0,   1, 2, 0},
 161         {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
 162         /*
 163          * If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n),
 164          * we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP
 165          * which is 0 if the kernel doesn't support TM.
 166          */
 167         {CPU_FTR_TM_COMP, 0, 0,         22, 0, 0},
 168 };
 169
 170 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
 171                                  unsigned long tablelen,
 172                                  struct ibm_pa_feature *fp,
 173                                  unsigned long ft_size)
 174 {
 175         unsigned long i, len, bit;
 176
 177         /* find descriptor with type == 0 */
 178         for (;;) {
 179                 if (tablelen < 3)
 180                         return;
 181                 len = 2 + ftrs[0];
 182                 if (tablelen < len)
 183                         return;         /* descriptor 0 not found */
 184                 if (ftrs[1] == 0)
 185                         break;
 186                 tablelen -= len;
 187                 ftrs += len;
 188         }
 189
 190         /* loop over bits we know about */
 191         for (i = 0; i < ft_size; ++i, ++fp) {
 192                 if (fp->pabyte >= ftrs[0])
 193                         continue;
 194                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
 195                 if (bit ^ fp->invert) {
 196                         cur_cpu_spec->cpu_features |= fp->cpu_features;
 197                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
 198                         cur_cpu_spec->mmu_features |= fp->mmu_features;
 199                 } else {
 200                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
 201                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
 202                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
 203                 }
 204         }
 205 }
 206
 207 static void __init check_cpu_pa_features(unsigned long node)
 208 {
 209         const unsigned char *pa_ftrs;
 210         int tablelen;
 211
 212         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
 213         if (pa_ftrs == NULL)
 214                 return;
 215
 216         scan_features(node, pa_ftrs, tablelen,
 217                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 218 }
 219
 220 #ifdef CONFIG_PPC_STD_MMU_64
 221 static void __init init_mmu_slb_size(unsigned long node)
 222 {
 223         const __be32 *slb_size_ptr;
 224
 225         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
 226                         of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 227
 228         if (slb_size_ptr)
 229                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 230 }
 231 #else
 232 #define init_mmu_slb_size(node) do { } while(0)
 233 #endif
 234
 235 static struct feature_property {
 236         const char *name;
 237         u32 min_value;
 238         unsigned long cpu_feature;
 239         unsigned long cpu_user_ftr;
 240 } feature_properties[] __initdata = {
 241 #ifdef CONFIG_ALTIVEC
 242         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 243         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 244 #endif /* CONFIG_ALTIVEC */
 245 #ifdef CONFIG_VSX
 246         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
 247         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
 248 #endif /* CONFIG_VSX */
 249 #ifdef CONFIG_PPC64
 250         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
 251         {"ibm,purr", 1, CPU_FTR_PURR, 0},
 252         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
 253 #endif /* CONFIG_PPC64 */
 254 };
 255
 256 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
 257 static inline void identical_pvr_fixup(unsigned long node)
 258 {
 259         unsigned int pvr;
 260         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 261
 262         /*
 263          * Since 440GR(x)/440EP(x) processors have the same pvr,
 264          * we check the node path and set bit 28 in the cur_cpu_spec
 265          * pvr for EP(x) processor version. This bit is always 0 in
 266          * the "real" pvr. Then we call identify_cpu again with
 267          * the new logical pvr to enable FPU support.
 268          */
 269         if (model && strstr(model, "440EP")) {
 270                 pvr = cur_cpu_spec->pvr_value | 0x8;
 271                 identify_cpu(0, pvr);
 272                 DBG("Using logical pvr %x for %s\n", pvr, model);
 273         }
 274 }
 275 #else
 276 #define identical_pvr_fixup(node) do { } while(0)
 277 #endif
 278
 279 static void __init check_cpu_feature_properties(unsigned long node)
 280 {
 281         unsigned long i;
 282         struct feature_property *fp = feature_properties;
 283         const __be32 *prop;
 284
 285         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
 286                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
 287                 if (prop && be32_to_cpup(prop) >= fp->min_value) {
 288                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
 289                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
 290                 }
 291         }
 292 }
 293
 294 static int __init early_init_dt_scan_cpus(unsigned long node,
 295                                           const char *uname, int depth,
 296                                           void *data)
 297 {
 298         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 299         const __be32 *prop;
 300         const __be32 *intserv;
 301         int i, nthreads;
 302         int len;
 303         int found = -1;
 304         int found_thread = 0;
 305
 306         /* We are scanning "cpu" nodes only */
 307         if (type == NULL || strcmp(type, "cpu") != 0)
 308                 return 0;
 309
 310         /* Get physical cpuid */
 311         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
 312         if (!intserv)
 313                 intserv = of_get_flat_dt_prop(node, "reg", &len);
 314
 315         nthreads = len / sizeof(int);
 316
 317         /*
 318          * Now see if any of these threads match our boot cpu.
 319          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 320          */
 321         for (i = 0; i < nthreads; i++) {
 322                 /*
 323                  * version 2 of the kexec param format adds the phys cpuid of
 324                  * booted proc.
 325                  */
 326                 if (fdt_version(initial_boot_params) >= 2) {
 327                         if (be32_to_cpu(intserv[i]) ==
 328                             fdt_boot_cpuid_phys(initial_boot_params)) {
 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         /* Not the boot CPU */
 349         if (found < 0)
 350                 return 0;
 351
 352         DBG("boot cpu: logical %d physical %d\n", found,
 353             be32_to_cpu(intserv[found_thread]));
 354         boot_cpuid = found;
 355         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 356
 357         /*
 358          * PAPR defines "logical" PVR values for cpus that
 359          * meet various levels of the architecture:
 360          * 0x0f000001   Architecture version 2.04
 361          * 0x0f000002   Architecture version 2.05
 362          * If the cpu-version property in the cpu node contains
 363          * such a value, we call identify_cpu again with the
 364          * logical PVR value in order to use the cpu feature
 365          * bits appropriate for the architecture level.
 366          *
 367          * A POWER6 partition in "POWER6 architected" mode
 368          * uses the 0x0f000002 PVR value; in POWER5+ mode
 369          * it uses 0x0f000001.
 370          */
 371         prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 372         if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
 373                 identify_cpu(0, be32_to_cpup(prop));
 374
 375         identical_pvr_fixup(node);
 376
 377         check_cpu_feature_properties(node);
 378         check_cpu_pa_features(node);
 379         init_mmu_slb_size(node);
 380
 381 #ifdef CONFIG_PPC64
 382         if (nthreads > 1)
 383                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 384         else
 385                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 386 #endif
 387         return 0;
 388 }
 389
 390 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 391                                                 const char *uname,
 392                                                 int depth, void *data)
 393 {
 394         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
 395
 396         /* Use common scan routine to determine if this is the chosen node */
 397         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
 398                 return 0;
 399
 400 #ifdef CONFIG_PPC64
 401         /* check if iommu is forced on or off */
 402         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 403                 iommu_is_off = 1;
 404         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 405                 iommu_force_on = 1;
 406 #endif
 407
 408         /* mem=x on the command line is the preferred mechanism */
 409         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 410         if (lprop)
 411                 memory_limit = *lprop;
 412
 413 #ifdef CONFIG_PPC64
 414         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 415         if (lprop)
 416                 tce_alloc_start = *lprop;
 417         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 418         if (lprop)
 419                 tce_alloc_end = *lprop;
 420 #endif
 421
 422 #ifdef CONFIG_KEXEC
 423         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 424         if (lprop)
 425                 crashk_res.start = *lprop;
 426
 427         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 428         if (lprop)
 429                 crashk_res.end = crashk_res.start + *lprop - 1;
 430 #endif
 431
 432         /* break now */
 433         return 1;
 434 }
 435
 436 #ifdef CONFIG_PPC_PSERIES
 437 /*
 438  * Interpret the ibm,dynamic-memory property in the
 439  * /ibm,dynamic-reconfiguration-memory node.
 440  * This contains a list of memory blocks along with NUMA affinity
 441  * information.
 442  */
 443 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 444 {
 445         const __be32 *dm, *ls, *usm;
 446         int l;
 447         unsigned long n, flags;
 448         u64 base, size, memblock_size;
 449         unsigned int is_kexec_kdump = 0, rngs;
 450
 451         ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
 452         if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
 453                 return 0;
 454         memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
 455
 456         dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 457         if (dm == NULL || l < sizeof(__be32))
 458                 return 0;
 459
 460         n = of_read_number(dm++, 1);    /* number of entries */
 461         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
 462                 return 0;
 463
 464         /* check if this is a kexec/kdump kernel. */
 465         usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
 466                                                  &l);
 467         if (usm != NULL)
 468                 is_kexec_kdump = 1;
 469
 470         for (; n != 0; --n) {
 471                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
 472                 flags = of_read_number(&dm[3], 1);
 473                 /* skip DRC index, pad, assoc. list index, flags */
 474                 dm += 4;
 475                 /* skip this block if the reserved bit is set in flags
 476                    or if the block is not assigned to this partition */
 477                 if ((flags & DRCONF_MEM_RESERVED) ||
 478                                 !(flags & DRCONF_MEM_ASSIGNED))
 479                         continue;
 480                 size = memblock_size;
 481                 rngs = 1;
 482                 if (is_kexec_kdump) {
 483                         /*
 484                          * For each memblock in ibm,dynamic-memory, a corresponding
 485                          * entry in linux,drconf-usable-memory property contains
 486                          * a counter 'p' followed by 'p' (base, size) duple.
 487                          * Now read the counter from
 488                          * linux,drconf-usable-memory property
 489                          */
 490                         rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
 491                         if (!rngs) /* there are no (base, size) duple */
 492                                 continue;
 493                 }
 494                 do {
 495                         if (is_kexec_kdump) {
 496                                 base = dt_mem_next_cell(dt_root_addr_cells,
 497                                                          &usm);
 498                                 size = dt_mem_next_cell(dt_root_size_cells,
 499                                                          &usm);
 500                         }
 501                         if (iommu_is_off) {
 502                                 if (base >= 0x80000000ul)
 503                                         continue;
 504                                 if ((base + size) > 0x80000000ul)
 505                                         size = 0x80000000ul - base;
 506                         }
 507                         memblock_add(base, size);
 508                 } while (--rngs);
 509         }
 510         memblock_dump_all();
 511         return 0;
 512 }
 513 #else
 514 #define early_init_dt_scan_drconf_memory(node)  0
 515 #endif /* CONFIG_PPC_PSERIES */
 516
 517 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 518                                                 const char *uname,
 519                                                 int depth, void *data)
 520 {
 521         if (depth == 1 &&
 522             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 523                 return early_init_dt_scan_drconf_memory(node);
 524
 525         return early_init_dt_scan_memory(node, uname, depth, data);
 526 }
 527
 528 /*
 529  * For a relocatable kernel, we need to get the memstart_addr first,
 530  * then use it to calculate the virtual kernel start address. This has
 531  * to happen at a very early stage (before machine_init). In this case,
 532  * we just want to get the memstart_address and would not like to mess the
 533  * memblock at this stage. So introduce a variable to skip the memblock_add()
 534  * for this reason.
 535  */
 536 #ifdef CONFIG_RELOCATABLE
 537 static int add_mem_to_memblock = 1;
 538 #else
 539 #define add_mem_to_memblock 1
 540 #endif
 541
 542 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 543 {
 544 #ifdef CONFIG_PPC64
 545         if (iommu_is_off) {
 546                 if (base >= 0x80000000ul)
 547                         return;
 548                 if ((base + size) > 0x80000000ul)
 549                         size = 0x80000000ul - base;
 550         }
 551 #endif
 552         /* Keep track of the beginning of memory -and- the size of
 553          * the very first block in the device-tree as it represents
 554          * the RMA on ppc64 server
 555          */
 556         if (base < memstart_addr) {
 557                 memstart_addr = base;
 558                 first_memblock_size = size;
 559         }
 560
 561         /* Add the chunk to the MEMBLOCK list */
 562         if (add_mem_to_memblock)
 563                 memblock_add(base, size);
 564 }
 565
 566 static void __init early_reserve_mem_dt(void)
 567 {
 568         unsigned long i, dt_root;
 569         int len;
 570         const __be32 *prop;
 571
 572         early_init_fdt_reserve_self();
 573         early_init_fdt_scan_reserved_mem();
 574
 575         dt_root = of_get_flat_dt_root();
 576
 577         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
 578
 579         if (!prop)
 580                 return;
 581
 582         DBG("Found new-style reserved-ranges\n");
 583
 584         /* Each reserved range is an (address,size) pair, 2 cells each,
 585          * totalling 4 cells per range. */
 586         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
 587                 u64 base, size;
 588
 589                 base = of_read_number(prop + (i * 4) + 0, 2);
 590                 size = of_read_number(prop + (i * 4) + 2, 2);
 591
 592                 if (size) {
 593                         DBG("reserving: %llx -> %llx\n", base, size);
 594                         memblock_reserve(base, size);
 595                 }
 596         }
 597 }
 598
 599 static void __init early_reserve_mem(void)
 600 {
 601         __be64 *reserve_map;
 602
 603         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
 604                         fdt_off_mem_rsvmap(initial_boot_params));
 605
 606         /* Look for the new "reserved-regions" property in the DT */
 607         early_reserve_mem_dt();
 608
 609 #ifdef CONFIG_BLK_DEV_INITRD
 610         /* Then reserve the initrd, if any */
 611         if (initrd_start && (initrd_end > initrd_start)) {
 612                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
 613                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
 614                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
 615         }
 616 #endif /* CONFIG_BLK_DEV_INITRD */
 617
 618 #ifdef CONFIG_PPC32
 619         /*
 620          * Handle the case where we might be booting from an old kexec
 621          * image that setup the mem_rsvmap as pairs of 32-bit values
 622          */
 623         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
 624                 u32 base_32, size_32;
 625                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
 626
 627                 DBG("Found old 32-bit reserve map\n");
 628
 629                 while (1) {
 630                         base_32 = be32_to_cpup(reserve_map_32++);
 631                         size_32 = be32_to_cpup(reserve_map_32++);
 632                         if (size_32 == 0)
 633                                 break;
 634                         DBG("reserving: %x -> %x\n", base_32, size_32);
 635                         memblock_reserve(base_32, size_32);
 636                 }
 637                 return;
 638         }
 639 #endif
 640 }
 641
 642 void __init early_init_devtree(void *params)
 643 {
 644         phys_addr_t limit;
 645
 646         DBG(" -> early_init_devtree(%p)\n", params);
 647
 648         /* Too early to BUG_ON(), do it by hand */
 649         if (!early_init_dt_verify(params))
 650                 panic("BUG: Failed verifying flat device tree, bad version?");
 651
 652 #ifdef CONFIG_PPC_RTAS
 653         /* Some machines might need RTAS info for debugging, grab it now. */
 654         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
 655 #endif
 656
 657 #ifdef CONFIG_PPC_POWERNV
 658         /* Some machines might need OPAL info for debugging, grab it now. */
 659         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
 660 #endif
 661
 662 #ifdef CONFIG_FA_DUMP
 663         /* scan tree to see if dump is active during last boot */
 664         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
 665 #endif
 666
 667         /* Retrieve various informations from the /chosen node of the
 668          * device-tree, including the platform type, initrd location and
 669          * size, TCE reserve, and more ...
 670          */
 671         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 672
 673         /* Scan memory nodes and rebuild MEMBLOCKs */
 674         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 675         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 676
 677         parse_early_param();
 678
 679         /* make sure we've parsed cmdline for mem= before this */
 680         if (memory_limit)
 681                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
 682         setup_initial_memory_limit(memstart_addr, first_memblock_size);
 683         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
 684         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
 685         /* If relocatable, reserve first 32k for interrupt vectors etc. */
 686         if (PHYSICAL_START > MEMORY_START)
 687                 memblock_reserve(MEMORY_START, 0x8000);
 688         reserve_kdump_trampoline();
 689 #ifdef CONFIG_FA_DUMP
 690         /*
 691          * If we fail to reserve memory for firmware-assisted dump then
 692          * fallback to kexec based kdump.
 693          */
 694         if (fadump_reserve_mem() == 0)
 695 #endif
 696                 reserve_crashkernel();
 697         early_reserve_mem();
 698
 699         /* Ensure that total memory size is page-aligned. */
 700         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
 701         memblock_enforce_memory_limit(limit);
 702
 703         memblock_allow_resize();
 704         memblock_dump_all();
 705
 706         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
 707
 708         /* We may need to relocate the flat tree, do it now.
 709          * FIXME .. and the initrd too? */
 710         move_device_tree();
 711
 712         allocate_pacas();
 713
 714         DBG("Scanning CPUs ...\n");
 715
 716         /* Retrieve CPU related informations from the flat tree
 717          * (altivec support, boot CPU ID, ...)
 718          */
 719         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 720         if (boot_cpuid < 0) {
 721                 printk("Failed to identify boot CPU !\n");
 722                 BUG();
 723         }
 724
 725 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
 726         /* We'll later wait for secondaries to check in; there are
 727          * NCPUS-1 non-boot CPUs  :-)
 728          */
 729         spinning_secondaries = boot_cpu_count - 1;
 730 #endif
 731
 732 #ifdef CONFIG_PPC_POWERNV
 733         /* Scan and build the list of machine check recoverable ranges */
 734         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
 735 #endif
 736
 737         DBG(" <- early_init_devtree()\n");
 738 }
 739
 740 #ifdef CONFIG_RELOCATABLE
 741 /*
 742  * This function run before early_init_devtree, so we have to init
 743  * initial_boot_params.
 744  */
 745 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
 746 {
 747         /* Setup flat device-tree pointer */
 748         initial_boot_params = params;
 749
 750         /*
 751          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
 752          * mess the memblock.
 753          */
 754         add_mem_to_memblock = 0;
 755         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 756         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 757         add_mem_to_memblock = 1;
 758
 759         if (size)
 760                 *size = first_memblock_size;
 761 }
 762 #endif
 763
 764 /*******
 765  *
 766  * New implementation of the OF "find" APIs, return a refcounted
 767  * object, call of_node_put() when done.  The device tree and list
 768  * are protected by a rw_lock.
 769  *
 770  * Note that property management will need some locking as well,
 771  * this isn't dealt with yet.
 772  *
 773  *******/
 774
 775 /**
 776  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
 777  * @np: device node of the device
 778  *
 779  * This looks for a property "ibm,chip-id" in the node or any
 780  * of its parents and returns its content, or -1 if it cannot
 781  * be found.
 782  */
 783 int of_get_ibm_chip_id(struct device_node *np)
 784 {
 785         of_node_get(np);
 786         while(np) {
 787                 struct device_node *old = np;
 788                 const __be32 *prop;
 789
 790                 prop = of_get_property(np, "ibm,chip-id", NULL);
 791                 if (prop) {
 792                         of_node_put(np);
 793                         return be32_to_cpup(prop);
 794                 }
 795                 np = of_get_parent(np);
 796                 of_node_put(old);
 797         }
 798         return -1;
 799 }
 800 EXPORT_SYMBOL(of_get_ibm_chip_id);
 801
 802 /**
 803  * cpu_to_chip_id - Return the cpus chip-id
 804  * @cpu: The logical cpu number.
 805  *
 806  * Return the value of the ibm,chip-id property corresponding to the given
 807  * logical cpu number. If the chip-id can not be found, returns -1.
 808  */
 809 int cpu_to_chip_id(int cpu)
 810 {
 811         struct device_node *np;
 812
 813         np = of_get_cpu_node(cpu, NULL);
 814         if (!np)
 815                 return -1;
 816
 817         of_node_put(np);
 818         return of_get_ibm_chip_id(np);
 819 }
 820 EXPORT_SYMBOL(cpu_to_chip_id);
 821
 822 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 823 {
 824         return (int)phys_id == get_hard_smp_processor_id(cpu);
 825 }