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