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 #include <linux/cpu.h>
  38
  39 #include <asm/prom.h>
  40 #include <asm/rtas.h>
  41 #include <asm/page.h>
  42 #include <asm/processor.h>
  43 #include <asm/irq.h>
  44 #include <asm/io.h>
  45 #include <asm/kdump.h>
  46 #include <asm/smp.h>
  47 #include <asm/mmu.h>
  48 #include <asm/paca.h>
  49 #include <asm/pgtable.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/epapr_hcalls.h>
  59 #include <asm/firmware.h>
  60 #include <asm/dt_cpu_ftrs.h>
  61
  62 #include <mm/mmu_decl.h>
  63
  64 #ifdef DEBUG
  65 #define DBG(fmt...) printk(KERN_ERR fmt)
  66 #else
  67 #define DBG(fmt...)
  68 #endif
  69
  70 #ifdef CONFIG_PPC64
  71 int __initdata iommu_is_off;
  72 int __initdata iommu_force_on;
  73 unsigned long tce_alloc_start, tce_alloc_end;
  74 u64 ppc64_rma_size;
  75 #endif
  76 static phys_addr_t first_memblock_size;
  77 static int __initdata boot_cpu_count;
  78
  79 static int __init early_parse_mem(char *p)
  80 {
  81         if (!p)
  82                 return 1;
  83
  84         memory_limit = PAGE_ALIGN(memparse(p, &p));
  85         DBG("memory limit = 0x%llx\n", memory_limit);
  86
  87         return 0;
  88 }
  89 early_param("mem", early_parse_mem);
  90
  91 /*
  92  * overlaps_initrd - check for overlap with page aligned extension of
  93  * initrd.
  94  */
  95 static inline int overlaps_initrd(unsigned long start, unsigned long size)
  96 {
  97 #ifdef CONFIG_BLK_DEV_INITRD
  98         if (!initrd_start)
  99                 return 0;
 100
 101         return  (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
 102                         start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
 103 #else
 104         return 0;
 105 #endif
 106 }
 107
 108 /**
 109  * move_device_tree - move tree to an unused area, if needed.
 110  *
 111  * The device tree may be allocated beyond our memory limit, or inside the
 112  * crash kernel region for kdump, or within the page aligned range of initrd.
 113  * If so, move it out of the way.
 114  */
 115 static void __init move_device_tree(void)
 116 {
 117         unsigned long start, size;
 118         void *p;
 119
 120         DBG("-> move_device_tree\n");
 121
 122         start = __pa(initial_boot_params);
 123         size = fdt_totalsize(initial_boot_params);
 124
 125         if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
 126                         overlaps_crashkernel(start, size) ||
 127                         overlaps_initrd(start, size)) {
 128                 p = __va(memblock_alloc(size, PAGE_SIZE));
 129                 memcpy(p, initial_boot_params, size);
 130                 initial_boot_params = p;
 131                 DBG("Moved device tree to 0x%p\n", p);
 132         }
 133
 134         DBG("<- move_device_tree\n");
 135 }
 136
 137 /*
 138  * ibm,pa-features is a per-cpu property that contains a string of
 139  * attribute descriptors, each of which has a 2 byte header plus up
 140  * to 254 bytes worth of processor attribute bits.  First header
 141  * byte specifies the number of bytes following the header.
 142  * Second header byte is an "attribute-specifier" type, of which
 143  * zero is the only currently-defined value.
 144  * Implementation:  Pass in the byte and bit offset for the feature
 145  * that we are interested in.  The function will return -1 if the
 146  * pa-features property is missing, or a 1/0 to indicate if the feature
 147  * is supported/not supported.  Note that the bit numbers are
 148  * big-endian to match the definition in PAPR.
 149  */
 150 static struct ibm_pa_feature {
 151         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
 152         unsigned long   mmu_features;   /* MMU_FTR_xxx bit */
 153         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
 154         unsigned int    cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */
 155         unsigned char   pabyte;         /* byte number in ibm,pa-features */
 156         unsigned char   pabit;          /* bit number (big-endian) */
 157         unsigned char   invert;         /* if 1, pa bit set => clear feature */
 158 } ibm_pa_features[] __initdata = {
 159         { .pabyte = 0,  .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU },
 160         { .pabyte = 0,  .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU },
 161         { .pabyte = 0,  .pabit = 3, .cpu_features  = CPU_FTR_CTRL },
 162         { .pabyte = 0,  .pabit = 6, .cpu_features  = CPU_FTR_NOEXECUTE },
 163         { .pabyte = 1,  .pabit = 2, .mmu_features  = MMU_FTR_CI_LARGE_PAGE },
 164 #ifdef CONFIG_PPC_RADIX_MMU
 165         { .pabyte = 40, .pabit = 0, .mmu_features  = MMU_FTR_TYPE_RADIX },
 166 #endif
 167         { .pabyte = 1,  .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN },
 168         { .pabyte = 5,  .pabit = 0, .cpu_features  = CPU_FTR_REAL_LE,
 169                                     .cpu_user_ftrs = PPC_FEATURE_TRUE_LE },
 170         /*
 171          * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
 172          * we don't want to turn on TM here, so we use the *_COMP versions
 173          * which are 0 if the kernel doesn't support TM.
 174          */
 175         { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
 176           .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP },
 177 };
 178
 179 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
 180                                  unsigned long tablelen,
 181                                  struct ibm_pa_feature *fp,
 182                                  unsigned long ft_size)
 183 {
 184         unsigned long i, len, bit;
 185
 186         /* find descriptor with type == 0 */
 187         for (;;) {
 188                 if (tablelen < 3)
 189                         return;
 190                 len = 2 + ftrs[0];
 191                 if (tablelen < len)
 192                         return;         /* descriptor 0 not found */
 193                 if (ftrs[1] == 0)
 194                         break;
 195                 tablelen -= len;
 196                 ftrs += len;
 197         }
 198
 199         /* loop over bits we know about */
 200         for (i = 0; i < ft_size; ++i, ++fp) {
 201                 if (fp->pabyte >= ftrs[0])
 202                         continue;
 203                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
 204                 if (bit ^ fp->invert) {
 205                         cur_cpu_spec->cpu_features |= fp->cpu_features;
 206                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
 207                         cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2;
 208                         cur_cpu_spec->mmu_features |= fp->mmu_features;
 209                 } else {
 210                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
 211                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
 212                         cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2;
 213                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
 214                 }
 215         }
 216 }
 217
 218 static void __init check_cpu_pa_features(unsigned long node)
 219 {
 220         const unsigned char *pa_ftrs;
 221         int tablelen;
 222
 223         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
 224         if (pa_ftrs == NULL)
 225                 return;
 226
 227         scan_features(node, pa_ftrs, tablelen,
 228                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 229 }
 230
 231 #ifdef CONFIG_PPC_STD_MMU_64
 232 static void __init init_mmu_slb_size(unsigned long node)
 233 {
 234         const __be32 *slb_size_ptr;
 235
 236         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
 237                         of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 238
 239         if (slb_size_ptr)
 240                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 241 }
 242 #else
 243 #define init_mmu_slb_size(node) do { } while(0)
 244 #endif
 245
 246 static struct feature_property {
 247         const char *name;
 248         u32 min_value;
 249         unsigned long cpu_feature;
 250         unsigned long cpu_user_ftr;
 251 } feature_properties[] __initdata = {
 252 #ifdef CONFIG_ALTIVEC
 253         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 254         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 255 #endif /* CONFIG_ALTIVEC */
 256 #ifdef CONFIG_VSX
 257         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
 258         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
 259 #endif /* CONFIG_VSX */
 260 #ifdef CONFIG_PPC64
 261         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
 262         {"ibm,purr", 1, CPU_FTR_PURR, 0},
 263         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
 264 #endif /* CONFIG_PPC64 */
 265 };
 266
 267 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
 268 static inline void identical_pvr_fixup(unsigned long node)
 269 {
 270         unsigned int pvr;
 271         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 272
 273         /*
 274          * Since 440GR(x)/440EP(x) processors have the same pvr,
 275          * we check the node path and set bit 28 in the cur_cpu_spec
 276          * pvr for EP(x) processor version. This bit is always 0 in
 277          * the "real" pvr. Then we call identify_cpu again with
 278          * the new logical pvr to enable FPU support.
 279          */
 280         if (model && strstr(model, "440EP")) {
 281                 pvr = cur_cpu_spec->pvr_value | 0x8;
 282                 identify_cpu(0, pvr);
 283                 DBG("Using logical pvr %x for %s\n", pvr, model);
 284         }
 285 }
 286 #else
 287 #define identical_pvr_fixup(node) do { } while(0)
 288 #endif
 289
 290 static void __init check_cpu_feature_properties(unsigned long node)
 291 {
 292         unsigned long i;
 293         struct feature_property *fp = feature_properties;
 294         const __be32 *prop;
 295
 296         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
 297                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
 298                 if (prop && be32_to_cpup(prop) >= fp->min_value) {
 299                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
 300                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
 301                 }
 302         }
 303 }
 304
 305 static int __init early_init_dt_scan_cpus(unsigned long node,
 306                                           const char *uname, int depth,
 307                                           void *data)
 308 {
 309         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 310         const __be32 *prop;
 311         const __be32 *intserv;
 312         int i, nthreads;
 313         int len;
 314         int found = -1;
 315         int found_thread = 0;
 316
 317         /* We are scanning "cpu" nodes only */
 318         if (type == NULL || strcmp(type, "cpu") != 0)
 319                 return 0;
 320
 321         /* Get physical cpuid */
 322         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
 323         if (!intserv)
 324                 intserv = of_get_flat_dt_prop(node, "reg", &len);
 325
 326         nthreads = len / sizeof(int);
 327
 328         /*
 329          * Now see if any of these threads match our boot cpu.
 330          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 331          */
 332         for (i = 0; i < nthreads; i++) {
 333                 /*
 334                  * version 2 of the kexec param format adds the phys cpuid of
 335                  * booted proc.
 336                  */
 337                 if (fdt_version(initial_boot_params) >= 2) {
 338                         if (be32_to_cpu(intserv[i]) ==
 339                             fdt_boot_cpuid_phys(initial_boot_params)) {
 340                                 found = boot_cpu_count;
 341                                 found_thread = i;
 342                         }
 343                 } else {
 344                         /*
 345                          * Check if it's the boot-cpu, set it's hw index now,
 346                          * unfortunately this format did not support booting
 347                          * off secondary threads.
 348                          */
 349                         if (of_get_flat_dt_prop(node,
 350                                         "linux,boot-cpu", NULL) != NULL)
 351                                 found = boot_cpu_count;
 352                 }
 353 #ifdef CONFIG_SMP
 354                 /* logical cpu id is always 0 on UP kernels */
 355                 boot_cpu_count++;
 356 #endif
 357         }
 358
 359         /* Not the boot CPU */
 360         if (found < 0)
 361                 return 0;
 362
 363         DBG("boot cpu: logical %d physical %d\n", found,
 364             be32_to_cpu(intserv[found_thread]));
 365         boot_cpuid = found;
 366         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 367
 368         /*
 369          * PAPR defines "logical" PVR values for cpus that
 370          * meet various levels of the architecture:
 371          * 0x0f000001   Architecture version 2.04
 372          * 0x0f000002   Architecture version 2.05
 373          * If the cpu-version property in the cpu node contains
 374          * such a value, we call identify_cpu again with the
 375          * logical PVR value in order to use the cpu feature
 376          * bits appropriate for the architecture level.
 377          *
 378          * A POWER6 partition in "POWER6 architected" mode
 379          * uses the 0x0f000002 PVR value; in POWER5+ mode
 380          * it uses 0x0f000001.
 381          *
 382          * If we're using device tree CPU feature discovery then we don't
 383          * support the cpu-version property, and it's the responsibility of the
 384          * firmware/hypervisor to provide the correct feature set for the
 385          * architecture level via the ibm,powerpc-cpu-features binding.
 386          */
 387         if (!dt_cpu_ftrs_in_use()) {
 388                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 389                 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
 390                         identify_cpu(0, be32_to_cpup(prop));
 391
 392                 check_cpu_feature_properties(node);
 393                 check_cpu_pa_features(node);
 394         }
 395
 396         identical_pvr_fixup(node);
 397         init_mmu_slb_size(node);
 398
 399 #ifdef CONFIG_PPC64
 400         if (nthreads == 1)
 401                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 402         else if (!dt_cpu_ftrs_in_use())
 403                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 404 #endif
 405
 406         return 0;
 407 }
 408
 409 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 410                                                 const char *uname,
 411                                                 int depth, void *data)
 412 {
 413         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
 414
 415         /* Use common scan routine to determine if this is the chosen node */
 416         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
 417                 return 0;
 418
 419 #ifdef CONFIG_PPC64
 420         /* check if iommu is forced on or off */
 421         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 422                 iommu_is_off = 1;
 423         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 424                 iommu_force_on = 1;
 425 #endif
 426
 427         /* mem=x on the command line is the preferred mechanism */
 428         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 429         if (lprop)
 430                 memory_limit = *lprop;
 431
 432 #ifdef CONFIG_PPC64
 433         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 434         if (lprop)
 435                 tce_alloc_start = *lprop;
 436         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 437         if (lprop)
 438                 tce_alloc_end = *lprop;
 439 #endif
 440
 441 #ifdef CONFIG_KEXEC_CORE
 442         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 443         if (lprop)
 444                 crashk_res.start = *lprop;
 445
 446         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 447         if (lprop)
 448                 crashk_res.end = crashk_res.start + *lprop - 1;
 449 #endif
 450
 451         /* break now */
 452         return 1;
 453 }
 454
 455 #ifdef CONFIG_PPC_PSERIES
 456 /*
 457  * Interpret the ibm,dynamic-memory property in the
 458  * /ibm,dynamic-reconfiguration-memory node.
 459  * This contains a list of memory blocks along with NUMA affinity
 460  * information.
 461  */
 462 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 463 {
 464         const __be32 *dm, *ls, *usm;
 465         int l;
 466         unsigned long n, flags;
 467         u64 base, size, memblock_size;
 468         unsigned int is_kexec_kdump = 0, rngs;
 469
 470         ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
 471         if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
 472                 return 0;
 473         memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
 474
 475         dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 476         if (dm == NULL || l < sizeof(__be32))
 477                 return 0;
 478
 479         n = of_read_number(dm++, 1);    /* number of entries */
 480         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
 481                 return 0;
 482
 483         /* check if this is a kexec/kdump kernel. */
 484         usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
 485                                                  &l);
 486         if (usm != NULL)
 487                 is_kexec_kdump = 1;
 488
 489         for (; n != 0; --n) {
 490                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
 491                 flags = of_read_number(&dm[3], 1);
 492                 /* skip DRC index, pad, assoc. list index, flags */
 493                 dm += 4;
 494                 /* skip this block if the reserved bit is set in flags
 495                    or if the block is not assigned to this partition */
 496                 if ((flags & DRCONF_MEM_RESERVED) ||
 497                                 !(flags & DRCONF_MEM_ASSIGNED))
 498                         continue;
 499                 size = memblock_size;
 500                 rngs = 1;
 501                 if (is_kexec_kdump) {
 502                         /*
 503                          * For each memblock in ibm,dynamic-memory, a corresponding
 504                          * entry in linux,drconf-usable-memory property contains
 505                          * a counter 'p' followed by 'p' (base, size) duple.
 506                          * Now read the counter from
 507                          * linux,drconf-usable-memory property
 508                          */
 509                         rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
 510                         if (!rngs) /* there are no (base, size) duple */
 511                                 continue;
 512                 }
 513                 do {
 514                         if (is_kexec_kdump) {
 515                                 base = dt_mem_next_cell(dt_root_addr_cells,
 516                                                          &usm);
 517                                 size = dt_mem_next_cell(dt_root_size_cells,
 518                                                          &usm);
 519                         }
 520                         if (iommu_is_off) {
 521                                 if (base >= 0x80000000ul)
 522                                         continue;
 523                                 if ((base + size) > 0x80000000ul)
 524                                         size = 0x80000000ul - base;
 525                         }
 526                         memblock_add(base, size);
 527                 } while (--rngs);
 528         }
 529         memblock_dump_all();
 530         return 0;
 531 }
 532 #else
 533 #define early_init_dt_scan_drconf_memory(node)  0
 534 #endif /* CONFIG_PPC_PSERIES */
 535
 536 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 537                                                 const char *uname,
 538                                                 int depth, void *data)
 539 {
 540         if (depth == 1 &&
 541             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 542                 return early_init_dt_scan_drconf_memory(node);
 543
 544         return early_init_dt_scan_memory(node, uname, depth, data);
 545 }
 546
 547 /*
 548  * For a relocatable kernel, we need to get the memstart_addr first,
 549  * then use it to calculate the virtual kernel start address. This has
 550  * to happen at a very early stage (before machine_init). In this case,
 551  * we just want to get the memstart_address and would not like to mess the
 552  * memblock at this stage. So introduce a variable to skip the memblock_add()
 553  * for this reason.
 554  */
 555 #ifdef CONFIG_RELOCATABLE
 556 static int add_mem_to_memblock = 1;
 557 #else
 558 #define add_mem_to_memblock 1
 559 #endif
 560
 561 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 562 {
 563 #ifdef CONFIG_PPC64
 564         if (iommu_is_off) {
 565                 if (base >= 0x80000000ul)
 566                         return;
 567                 if ((base + size) > 0x80000000ul)
 568                         size = 0x80000000ul - base;
 569         }
 570 #endif
 571         /* Keep track of the beginning of memory -and- the size of
 572          * the very first block in the device-tree as it represents
 573          * the RMA on ppc64 server
 574          */
 575         if (base < memstart_addr) {
 576                 memstart_addr = base;
 577                 first_memblock_size = size;
 578         }
 579
 580         /* Add the chunk to the MEMBLOCK list */
 581         if (add_mem_to_memblock)
 582                 memblock_add(base, size);
 583 }
 584
 585 static void __init early_reserve_mem_dt(void)
 586 {
 587         unsigned long i, dt_root;
 588         int len;
 589         const __be32 *prop;
 590
 591         early_init_fdt_reserve_self();
 592         early_init_fdt_scan_reserved_mem();
 593
 594         dt_root = of_get_flat_dt_root();
 595
 596         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
 597
 598         if (!prop)
 599                 return;
 600
 601         DBG("Found new-style reserved-ranges\n");
 602
 603         /* Each reserved range is an (address,size) pair, 2 cells each,
 604          * totalling 4 cells per range. */
 605         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
 606                 u64 base, size;
 607
 608                 base = of_read_number(prop + (i * 4) + 0, 2);
 609                 size = of_read_number(prop + (i * 4) + 2, 2);
 610
 611                 if (size) {
 612                         DBG("reserving: %llx -> %llx\n", base, size);
 613                         memblock_reserve(base, size);
 614                 }
 615         }
 616 }
 617
 618 static void __init early_reserve_mem(void)
 619 {
 620         __be64 *reserve_map;
 621
 622         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
 623                         fdt_off_mem_rsvmap(initial_boot_params));
 624
 625         /* Look for the new "reserved-regions" property in the DT */
 626         early_reserve_mem_dt();
 627
 628 #ifdef CONFIG_BLK_DEV_INITRD
 629         /* Then reserve the initrd, if any */
 630         if (initrd_start && (initrd_end > initrd_start)) {
 631                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
 632                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
 633                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
 634         }
 635 #endif /* CONFIG_BLK_DEV_INITRD */
 636
 637 #ifdef CONFIG_PPC32
 638         /*
 639          * Handle the case where we might be booting from an old kexec
 640          * image that setup the mem_rsvmap as pairs of 32-bit values
 641          */
 642         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
 643                 u32 base_32, size_32;
 644                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
 645
 646                 DBG("Found old 32-bit reserve map\n");
 647
 648                 while (1) {
 649                         base_32 = be32_to_cpup(reserve_map_32++);
 650                         size_32 = be32_to_cpup(reserve_map_32++);
 651                         if (size_32 == 0)
 652                                 break;
 653                         DBG("reserving: %x -> %x\n", base_32, size_32);
 654                         memblock_reserve(base_32, size_32);
 655                 }
 656                 return;
 657         }
 658 #endif
 659 }
 660
 661 void __init early_init_devtree(void *params)
 662 {
 663         phys_addr_t limit;
 664
 665         DBG(" -> early_init_devtree(%p)\n", params);
 666
 667         /* Too early to BUG_ON(), do it by hand */
 668         if (!early_init_dt_verify(params))
 669                 panic("BUG: Failed verifying flat device tree, bad version?");
 670
 671 #ifdef CONFIG_PPC_RTAS
 672         /* Some machines might need RTAS info for debugging, grab it now. */
 673         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
 674 #endif
 675
 676 #ifdef CONFIG_PPC_POWERNV
 677         /* Some machines might need OPAL info for debugging, grab it now. */
 678         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
 679 #endif
 680
 681 #ifdef CONFIG_FA_DUMP
 682         /* scan tree to see if dump is active during last boot */
 683         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
 684 #endif
 685
 686         /* Retrieve various informations from the /chosen node of the
 687          * device-tree, including the platform type, initrd location and
 688          * size, TCE reserve, and more ...
 689          */
 690         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 691
 692         /* Scan memory nodes and rebuild MEMBLOCKs */
 693         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 694         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 695
 696         parse_early_param();
 697
 698         /* make sure we've parsed cmdline for mem= before this */
 699         if (memory_limit)
 700                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
 701         setup_initial_memory_limit(memstart_addr, first_memblock_size);
 702         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
 703         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
 704         /* If relocatable, reserve first 32k for interrupt vectors etc. */
 705         if (PHYSICAL_START > MEMORY_START)
 706                 memblock_reserve(MEMORY_START, 0x8000);
 707         reserve_kdump_trampoline();
 708 #ifdef CONFIG_FA_DUMP
 709         /*
 710          * If we fail to reserve memory for firmware-assisted dump then
 711          * fallback to kexec based kdump.
 712          */
 713         if (fadump_reserve_mem() == 0)
 714 #endif
 715                 reserve_crashkernel();
 716         early_reserve_mem();
 717
 718         /* Ensure that total memory size is page-aligned. */
 719         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
 720         memblock_enforce_memory_limit(limit);
 721
 722         memblock_allow_resize();
 723         memblock_dump_all();
 724
 725         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
 726
 727         /* We may need to relocate the flat tree, do it now.
 728          * FIXME .. and the initrd too? */
 729         move_device_tree();
 730
 731         allocate_pacas();
 732
 733         DBG("Scanning CPUs ...\n");
 734
 735         dt_cpu_ftrs_scan();
 736
 737         /* Retrieve CPU related informations from the flat tree
 738          * (altivec support, boot CPU ID, ...)
 739          */
 740         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 741         if (boot_cpuid < 0) {
 742                 printk("Failed to identify boot CPU !\n");
 743                 BUG();
 744         }
 745
 746 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
 747         /* We'll later wait for secondaries to check in; there are
 748          * NCPUS-1 non-boot CPUs  :-)
 749          */
 750         spinning_secondaries = boot_cpu_count - 1;
 751 #endif
 752
 753         mmu_early_init_devtree();
 754
 755 #ifdef CONFIG_PPC_POWERNV
 756         /* Scan and build the list of machine check recoverable ranges */
 757         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
 758 #endif
 759         epapr_paravirt_early_init();
 760
 761         /* Now try to figure out if we are running on LPAR and so on */
 762         pseries_probe_fw_features();
 763
 764 #ifdef CONFIG_PPC_PS3
 765         /* Identify PS3 firmware */
 766         if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
 767                 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
 768 #endif
 769
 770         DBG(" <- early_init_devtree()\n");
 771 }
 772
 773 #ifdef CONFIG_RELOCATABLE
 774 /*
 775  * This function run before early_init_devtree, so we have to init
 776  * initial_boot_params.
 777  */
 778 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
 779 {
 780         /* Setup flat device-tree pointer */
 781         initial_boot_params = params;
 782
 783         /*
 784          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
 785          * mess the memblock.
 786          */
 787         add_mem_to_memblock = 0;
 788         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 789         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 790         add_mem_to_memblock = 1;
 791
 792         if (size)
 793                 *size = first_memblock_size;
 794 }
 795 #endif
 796
 797 /*******
 798  *
 799  * New implementation of the OF "find" APIs, return a refcounted
 800  * object, call of_node_put() when done.  The device tree and list
 801  * are protected by a rw_lock.
 802  *
 803  * Note that property management will need some locking as well,
 804  * this isn't dealt with yet.
 805  *
 806  *******/
 807
 808 /**
 809  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
 810  * @np: device node of the device
 811  *
 812  * This looks for a property "ibm,chip-id" in the node or any
 813  * of its parents and returns its content, or -1 if it cannot
 814  * be found.
 815  */
 816 int of_get_ibm_chip_id(struct device_node *np)
 817 {
 818         of_node_get(np);
 819         while (np) {
 820                 u32 chip_id;
 821
 822                 /*
 823                  * Skiboot may produce memory nodes that contain more than one
 824                  * cell in chip-id, we only read the first one here.
 825                  */
 826                 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) {
 827                         of_node_put(np);
 828                         return chip_id;
 829                 }
 830
 831                 np = of_get_next_parent(np);
 832         }
 833         return -1;
 834 }
 835 EXPORT_SYMBOL(of_get_ibm_chip_id);
 836
 837 /**
 838  * cpu_to_chip_id - Return the cpus chip-id
 839  * @cpu: The logical cpu number.
 840  *
 841  * Return the value of the ibm,chip-id property corresponding to the given
 842  * logical cpu number. If the chip-id can not be found, returns -1.
 843  */
 844 int cpu_to_chip_id(int cpu)
 845 {
 846         struct device_node *np;
 847
 848         np = of_get_cpu_node(cpu, NULL);
 849         if (!np)
 850                 return -1;
 851
 852         of_node_put(np);
 853         return of_get_ibm_chip_id(np);
 854 }
 855 EXPORT_SYMBOL(cpu_to_chip_id);
 856
 857 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 858 {
 859         return (int)phys_id == get_hard_smp_processor_id(cpu);
 860 }