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 int    cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */
 153         unsigned char   pabyte;         /* byte number in ibm,pa-features */
 154         unsigned char   pabit;          /* bit number (big-endian) */
 155         unsigned char   invert;         /* if 1, pa bit set => clear feature */
 156 } ibm_pa_features[] __initdata = {
 157         {0, 0, PPC_FEATURE_HAS_MMU, 0,          0, 0, 0},
 158         {0, 0, PPC_FEATURE_HAS_FPU, 0,          0, 1, 0},
 159         {CPU_FTR_CTRL, 0, 0, 0,                 0, 3, 0},
 160         {CPU_FTR_NOEXECUTE, 0, 0, 0,            0, 6, 0},
 161         {CPU_FTR_NODSISRALIGN, 0, 0, 0,         1, 1, 1},
 162         {0, MMU_FTR_CI_LARGE_PAGE, 0, 0,                1, 2, 0},
 163         {CPU_FTR_REAL_LE, 0, PPC_FEATURE_TRUE_LE, 0, 5, 0, 0},
 164         /*
 165          * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
 166          * we don't want to turn on TM here, so we use the *_COMP versions
 167          * which are 0 if the kernel doesn't support TM.
 168          */
 169         {CPU_FTR_TM_COMP, 0, 0, PPC_FEATURE2_HTM_COMP, 22, 0, 0},
 170 };
 171
 172 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
 173                                  unsigned long tablelen,
 174                                  struct ibm_pa_feature *fp,
 175                                  unsigned long ft_size)
 176 {
 177         unsigned long i, len, bit;
 178
 179         /* find descriptor with type == 0 */
 180         for (;;) {
 181                 if (tablelen < 3)
 182                         return;
 183                 len = 2 + ftrs[0];
 184                 if (tablelen < len)
 185                         return;         /* descriptor 0 not found */
 186                 if (ftrs[1] == 0)
 187                         break;
 188                 tablelen -= len;
 189                 ftrs += len;
 190         }
 191
 192         /* loop over bits we know about */
 193         for (i = 0; i < ft_size; ++i, ++fp) {
 194                 if (fp->pabyte >= ftrs[0])
 195                         continue;
 196                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
 197                 if (bit ^ fp->invert) {
 198                         cur_cpu_spec->cpu_features |= fp->cpu_features;
 199                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
 200                         cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2;
 201                         cur_cpu_spec->mmu_features |= fp->mmu_features;
 202                 } else {
 203                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
 204                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
 205                         cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2;
 206                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
 207                 }
 208         }
 209 }
 210
 211 static void __init check_cpu_pa_features(unsigned long node)
 212 {
 213         const unsigned char *pa_ftrs;
 214         int tablelen;
 215
 216         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
 217         if (pa_ftrs == NULL)
 218                 return;
 219
 220         scan_features(node, pa_ftrs, tablelen,
 221                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 222 }
 223
 224 #ifdef CONFIG_PPC_STD_MMU_64
 225 static void __init check_cpu_slb_size(unsigned long node)
 226 {
 227         const __be32 *slb_size_ptr;
 228
 229         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
 230         if (slb_size_ptr != NULL) {
 231                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 232                 return;
 233         }
 234         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 235         if (slb_size_ptr != NULL) {
 236                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 237         }
 238 }
 239 #else
 240 #define check_cpu_slb_size(node) do { } while(0)
 241 #endif
 242
 243 static struct feature_property {
 244         const char *name;
 245         u32 min_value;
 246         unsigned long cpu_feature;
 247         unsigned long cpu_user_ftr;
 248 } feature_properties[] __initdata = {
 249 #ifdef CONFIG_ALTIVEC
 250         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 251         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 252 #endif /* CONFIG_ALTIVEC */
 253 #ifdef CONFIG_VSX
 254         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
 255         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
 256 #endif /* CONFIG_VSX */
 257 #ifdef CONFIG_PPC64
 258         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
 259         {"ibm,purr", 1, CPU_FTR_PURR, 0},
 260         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
 261 #endif /* CONFIG_PPC64 */
 262 };
 263
 264 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
 265 static inline void identical_pvr_fixup(unsigned long node)
 266 {
 267         unsigned int pvr;
 268         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 269
 270         /*
 271          * Since 440GR(x)/440EP(x) processors have the same pvr,
 272          * we check the node path and set bit 28 in the cur_cpu_spec
 273          * pvr for EP(x) processor version. This bit is always 0 in
 274          * the "real" pvr. Then we call identify_cpu again with
 275          * the new logical pvr to enable FPU support.
 276          */
 277         if (model && strstr(model, "440EP")) {
 278                 pvr = cur_cpu_spec->pvr_value | 0x8;
 279                 identify_cpu(0, pvr);
 280                 DBG("Using logical pvr %x for %s\n", pvr, model);
 281         }
 282 }
 283 #else
 284 #define identical_pvr_fixup(node) do { } while(0)
 285 #endif
 286
 287 static void __init check_cpu_feature_properties(unsigned long node)
 288 {
 289         unsigned long i;
 290         struct feature_property *fp = feature_properties;
 291         const __be32 *prop;
 292
 293         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
 294                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
 295                 if (prop && be32_to_cpup(prop) >= fp->min_value) {
 296                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
 297                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
 298                 }
 299         }
 300 }
 301
 302 static int __init early_init_dt_scan_cpus(unsigned long node,
 303                                           const char *uname, int depth,
 304                                           void *data)
 305 {
 306         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 307         const __be32 *prop;
 308         const __be32 *intserv;
 309         int i, nthreads;
 310         int len;
 311         int found = -1;
 312         int found_thread = 0;
 313
 314         /* We are scanning "cpu" nodes only */
 315         if (type == NULL || strcmp(type, "cpu") != 0)
 316                 return 0;
 317
 318         /* Get physical cpuid */
 319         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
 320         if (!intserv)
 321                 intserv = of_get_flat_dt_prop(node, "reg", &len);
 322
 323         nthreads = len / sizeof(int);
 324
 325         /*
 326          * Now see if any of these threads match our boot cpu.
 327          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 328          */
 329         for (i = 0; i < nthreads; i++) {
 330                 /*
 331                  * version 2 of the kexec param format adds the phys cpuid of
 332                  * booted proc.
 333                  */
 334                 if (fdt_version(initial_boot_params) >= 2) {
 335                         if (be32_to_cpu(intserv[i]) ==
 336                             fdt_boot_cpuid_phys(initial_boot_params)) {
 337                                 found = boot_cpu_count;
 338                                 found_thread = i;
 339                         }
 340                 } else {
 341                         /*
 342                          * Check if it's the boot-cpu, set it's hw index now,
 343                          * unfortunately this format did not support booting
 344                          * off secondary threads.
 345                          */
 346                         if (of_get_flat_dt_prop(node,
 347                                         "linux,boot-cpu", NULL) != NULL)
 348                                 found = boot_cpu_count;
 349                 }
 350 #ifdef CONFIG_SMP
 351                 /* logical cpu id is always 0 on UP kernels */
 352                 boot_cpu_count++;
 353 #endif
 354         }
 355
 356         /* Not the boot CPU */
 357         if (found < 0)
 358                 return 0;
 359
 360         DBG("boot cpu: logical %d physical %d\n", found,
 361             be32_to_cpu(intserv[found_thread]));
 362         boot_cpuid = found;
 363         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 364
 365         /*
 366          * PAPR defines "logical" PVR values for cpus that
 367          * meet various levels of the architecture:
 368          * 0x0f000001   Architecture version 2.04
 369          * 0x0f000002   Architecture version 2.05
 370          * If the cpu-version property in the cpu node contains
 371          * such a value, we call identify_cpu again with the
 372          * logical PVR value in order to use the cpu feature
 373          * bits appropriate for the architecture level.
 374          *
 375          * A POWER6 partition in "POWER6 architected" mode
 376          * uses the 0x0f000002 PVR value; in POWER5+ mode
 377          * it uses 0x0f000001.
 378          */
 379         prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 380         if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
 381                 identify_cpu(0, be32_to_cpup(prop));
 382
 383         identical_pvr_fixup(node);
 384
 385         check_cpu_feature_properties(node);
 386         check_cpu_pa_features(node);
 387         check_cpu_slb_size(node);
 388
 389 #ifdef CONFIG_PPC64
 390         if (nthreads > 1)
 391                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 392         else
 393                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 394 #endif
 395         return 0;
 396 }
 397
 398 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 399                                                 const char *uname,
 400                                                 int depth, void *data)
 401 {
 402         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
 403
 404         /* Use common scan routine to determine if this is the chosen node */
 405         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
 406                 return 0;
 407
 408 #ifdef CONFIG_PPC64
 409         /* check if iommu is forced on or off */
 410         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 411                 iommu_is_off = 1;
 412         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 413                 iommu_force_on = 1;
 414 #endif
 415
 416         /* mem=x on the command line is the preferred mechanism */
 417         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 418         if (lprop)
 419                 memory_limit = *lprop;
 420
 421 #ifdef CONFIG_PPC64
 422         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 423         if (lprop)
 424                 tce_alloc_start = *lprop;
 425         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 426         if (lprop)
 427                 tce_alloc_end = *lprop;
 428 #endif
 429
 430 #ifdef CONFIG_KEXEC
 431         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 432         if (lprop)
 433                 crashk_res.start = *lprop;
 434
 435         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 436         if (lprop)
 437                 crashk_res.end = crashk_res.start + *lprop - 1;
 438 #endif
 439
 440         /* break now */
 441         return 1;
 442 }
 443
 444 #ifdef CONFIG_PPC_PSERIES
 445 /*
 446  * Interpret the ibm,dynamic-memory property in the
 447  * /ibm,dynamic-reconfiguration-memory node.
 448  * This contains a list of memory blocks along with NUMA affinity
 449  * information.
 450  */
 451 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 452 {
 453         const __be32 *dm, *ls, *usm;
 454         int l;
 455         unsigned long n, flags;
 456         u64 base, size, memblock_size;
 457         unsigned int is_kexec_kdump = 0, rngs;
 458
 459         ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
 460         if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
 461                 return 0;
 462         memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
 463
 464         dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 465         if (dm == NULL || l < sizeof(__be32))
 466                 return 0;
 467
 468         n = of_read_number(dm++, 1);    /* number of entries */
 469         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
 470                 return 0;
 471
 472         /* check if this is a kexec/kdump kernel. */
 473         usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
 474                                                  &l);
 475         if (usm != NULL)
 476                 is_kexec_kdump = 1;
 477
 478         for (; n != 0; --n) {
 479                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
 480                 flags = of_read_number(&dm[3], 1);
 481                 /* skip DRC index, pad, assoc. list index, flags */
 482                 dm += 4;
 483                 /* skip this block if the reserved bit is set in flags (0x80)
 484                    or if the block is not assigned to this partition (0x8) */
 485                 if ((flags & 0x80) || !(flags & 0x8))
 486                         continue;
 487                 size = memblock_size;
 488                 rngs = 1;
 489                 if (is_kexec_kdump) {
 490                         /*
 491                          * For each memblock in ibm,dynamic-memory, a corresponding
 492                          * entry in linux,drconf-usable-memory property contains
 493                          * a counter 'p' followed by 'p' (base, size) duple.
 494                          * Now read the counter from
 495                          * linux,drconf-usable-memory property
 496                          */
 497                         rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
 498                         if (!rngs) /* there are no (base, size) duple */
 499                                 continue;
 500                 }
 501                 do {
 502                         if (is_kexec_kdump) {
 503                                 base = dt_mem_next_cell(dt_root_addr_cells,
 504                                                          &usm);
 505                                 size = dt_mem_next_cell(dt_root_size_cells,
 506                                                          &usm);
 507                         }
 508                         if (iommu_is_off) {
 509                                 if (base >= 0x80000000ul)
 510                                         continue;
 511                                 if ((base + size) > 0x80000000ul)
 512                                         size = 0x80000000ul - base;
 513                         }
 514                         memblock_add(base, size);
 515                 } while (--rngs);
 516         }
 517         memblock_dump_all();
 518         return 0;
 519 }
 520 #else
 521 #define early_init_dt_scan_drconf_memory(node)  0
 522 #endif /* CONFIG_PPC_PSERIES */
 523
 524 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 525                                                 const char *uname,
 526                                                 int depth, void *data)
 527 {
 528         if (depth == 1 &&
 529             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 530                 return early_init_dt_scan_drconf_memory(node);
 531
 532         return early_init_dt_scan_memory(node, uname, depth, data);
 533 }
 534
 535 /*
 536  * For a relocatable kernel, we need to get the memstart_addr first,
 537  * then use it to calculate the virtual kernel start address. This has
 538  * to happen at a very early stage (before machine_init). In this case,
 539  * we just want to get the memstart_address and would not like to mess the
 540  * memblock at this stage. So introduce a variable to skip the memblock_add()
 541  * for this reason.
 542  */
 543 #ifdef CONFIG_RELOCATABLE
 544 static int add_mem_to_memblock = 1;
 545 #else
 546 #define add_mem_to_memblock 1
 547 #endif
 548
 549 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 550 {
 551 #ifdef CONFIG_PPC64
 552         if (iommu_is_off) {
 553                 if (base >= 0x80000000ul)
 554                         return;
 555                 if ((base + size) > 0x80000000ul)
 556                         size = 0x80000000ul - base;
 557         }
 558 #endif
 559         /* Keep track of the beginning of memory -and- the size of
 560          * the very first block in the device-tree as it represents
 561          * the RMA on ppc64 server
 562          */
 563         if (base < memstart_addr) {
 564                 memstart_addr = base;
 565                 first_memblock_size = size;
 566         }
 567
 568         /* Add the chunk to the MEMBLOCK list */
 569         if (add_mem_to_memblock)
 570                 memblock_add(base, size);
 571 }
 572
 573 static void __init early_reserve_mem_dt(void)
 574 {
 575         unsigned long i, dt_root;
 576         int len;
 577         const __be32 *prop;
 578
 579         early_init_fdt_scan_reserved_mem();
 580
 581         dt_root = of_get_flat_dt_root();
 582
 583         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
 584
 585         if (!prop)
 586                 return;
 587
 588         DBG("Found new-style reserved-ranges\n");
 589
 590         /* Each reserved range is an (address,size) pair, 2 cells each,
 591          * totalling 4 cells per range. */
 592         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
 593                 u64 base, size;
 594
 595                 base = of_read_number(prop + (i * 4) + 0, 2);
 596                 size = of_read_number(prop + (i * 4) + 2, 2);
 597
 598                 if (size) {
 599                         DBG("reserving: %llx -> %llx\n", base, size);
 600                         memblock_reserve(base, size);
 601                 }
 602         }
 603 }
 604
 605 static void __init early_reserve_mem(void)
 606 {
 607         __be64 *reserve_map;
 608
 609         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
 610                         fdt_off_mem_rsvmap(initial_boot_params));
 611
 612         /* Look for the new "reserved-regions" property in the DT */
 613         early_reserve_mem_dt();
 614
 615 #ifdef CONFIG_BLK_DEV_INITRD
 616         /* Then reserve the initrd, if any */
 617         if (initrd_start && (initrd_end > initrd_start)) {
 618                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
 619                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
 620                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
 621         }
 622 #endif /* CONFIG_BLK_DEV_INITRD */
 623
 624 #ifdef CONFIG_PPC32
 625         /*
 626          * Handle the case where we might be booting from an old kexec
 627          * image that setup the mem_rsvmap as pairs of 32-bit values
 628          */
 629         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
 630                 u32 base_32, size_32;
 631                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
 632
 633                 DBG("Found old 32-bit reserve map\n");
 634
 635                 while (1) {
 636                         base_32 = be32_to_cpup(reserve_map_32++);
 637                         size_32 = be32_to_cpup(reserve_map_32++);
 638                         if (size_32 == 0)
 639                                 break;
 640                         DBG("reserving: %x -> %x\n", base_32, size_32);
 641                         memblock_reserve(base_32, size_32);
 642                 }
 643                 return;
 644         }
 645 #endif
 646 }
 647
 648 void __init early_init_devtree(void *params)
 649 {
 650         phys_addr_t limit;
 651
 652         DBG(" -> early_init_devtree(%p)\n", params);
 653
 654         /* Too early to BUG_ON(), do it by hand */
 655         if (!early_init_dt_verify(params))
 656                 panic("BUG: Failed verifying flat device tree, bad version?");
 657
 658 #ifdef CONFIG_PPC_RTAS
 659         /* Some machines might need RTAS info for debugging, grab it now. */
 660         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
 661 #endif
 662
 663 #ifdef CONFIG_PPC_POWERNV
 664         /* Some machines might need OPAL info for debugging, grab it now. */
 665         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
 666 #endif
 667
 668 #ifdef CONFIG_FA_DUMP
 669         /* scan tree to see if dump is active during last boot */
 670         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
 671 #endif
 672
 673         /* Retrieve various informations from the /chosen node of the
 674          * device-tree, including the platform type, initrd location and
 675          * size, TCE reserve, and more ...
 676          */
 677         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 678
 679         /* Scan memory nodes and rebuild MEMBLOCKs */
 680         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 681         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 682
 683         parse_early_param();
 684
 685         /* make sure we've parsed cmdline for mem= before this */
 686         if (memory_limit)
 687                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
 688         setup_initial_memory_limit(memstart_addr, first_memblock_size);
 689         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
 690         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
 691         /* If relocatable, reserve first 32k for interrupt vectors etc. */
 692         if (PHYSICAL_START > MEMORY_START)
 693                 memblock_reserve(MEMORY_START, 0x8000);
 694         reserve_kdump_trampoline();
 695 #ifdef CONFIG_FA_DUMP
 696         /*
 697          * If we fail to reserve memory for firmware-assisted dump then
 698          * fallback to kexec based kdump.
 699          */
 700         if (fadump_reserve_mem() == 0)
 701 #endif
 702                 reserve_crashkernel();
 703         early_reserve_mem();
 704
 705         /* Ensure that total memory size is page-aligned. */
 706         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
 707         memblock_enforce_memory_limit(limit);
 708
 709         memblock_allow_resize();
 710         memblock_dump_all();
 711
 712         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
 713
 714         /* We may need to relocate the flat tree, do it now.
 715          * FIXME .. and the initrd too? */
 716         move_device_tree();
 717
 718         allocate_pacas();
 719
 720         DBG("Scanning CPUs ...\n");
 721
 722         /* Retrieve CPU related informations from the flat tree
 723          * (altivec support, boot CPU ID, ...)
 724          */
 725         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 726         if (boot_cpuid < 0) {
 727                 printk("Failed to identify boot CPU !\n");
 728                 BUG();
 729         }
 730
 731 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
 732         /* We'll later wait for secondaries to check in; there are
 733          * NCPUS-1 non-boot CPUs  :-)
 734          */
 735         spinning_secondaries = boot_cpu_count - 1;
 736 #endif
 737
 738 #ifdef CONFIG_PPC_POWERNV
 739         /* Scan and build the list of machine check recoverable ranges */
 740         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
 741 #endif
 742
 743         DBG(" <- early_init_devtree()\n");
 744 }
 745
 746 #ifdef CONFIG_RELOCATABLE
 747 /*
 748  * This function run before early_init_devtree, so we have to init
 749  * initial_boot_params.
 750  */
 751 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
 752 {
 753         /* Setup flat device-tree pointer */
 754         initial_boot_params = params;
 755
 756         /*
 757          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
 758          * mess the memblock.
 759          */
 760         add_mem_to_memblock = 0;
 761         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 762         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 763         add_mem_to_memblock = 1;
 764
 765         if (size)
 766                 *size = first_memblock_size;
 767 }
 768 #endif
 769
 770 /*******
 771  *
 772  * New implementation of the OF "find" APIs, return a refcounted
 773  * object, call of_node_put() when done.  The device tree and list
 774  * are protected by a rw_lock.
 775  *
 776  * Note that property management will need some locking as well,
 777  * this isn't dealt with yet.
 778  *
 779  *******/
 780
 781 /**
 782  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
 783  * @np: device node of the device
 784  *
 785  * This looks for a property "ibm,chip-id" in the node or any
 786  * of its parents and returns its content, or -1 if it cannot
 787  * be found.
 788  */
 789 int of_get_ibm_chip_id(struct device_node *np)
 790 {
 791         of_node_get(np);
 792         while(np) {
 793                 struct device_node *old = np;
 794                 const __be32 *prop;
 795
 796                 prop = of_get_property(np, "ibm,chip-id", NULL);
 797                 if (prop) {
 798                         of_node_put(np);
 799                         return be32_to_cpup(prop);
 800                 }
 801                 np = of_get_parent(np);
 802                 of_node_put(old);
 803         }
 804         return -1;
 805 }
 806
 807 /**
 808  * cpu_to_chip_id - Return the cpus chip-id
 809  * @cpu: The logical cpu number.
 810  *
 811  * Return the value of the ibm,chip-id property corresponding to the given
 812  * logical cpu number. If the chip-id can not be found, returns -1.
 813  */
 814 int cpu_to_chip_id(int cpu)
 815 {
 816         struct device_node *np;
 817
 818         np = of_get_cpu_node(cpu, NULL);
 819         if (!np)
 820                 return -1;
 821
 822         of_node_put(np);
 823         return of_get_ibm_chip_id(np);
 824 }
 825 EXPORT_SYMBOL(cpu_to_chip_id);
 826
 827 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 828 {
 829         return (int)phys_id == get_hard_smp_processor_id(cpu);
 830 }