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