arch/powerpc/kernel/setup_64.c

   1 /*
   2  *
   3  * Common boot and setup code.
   4  *
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #undef DEBUG
  14
  15 #include <linux/export.h>
  16 #include <linux/string.h>
  17 #include <linux/sched.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/reboot.h>
  21 #include <linux/delay.h>
  22 #include <linux/initrd.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/ioport.h>
  25 #include <linux/console.h>
  26 #include <linux/utsname.h>
  27 #include <linux/tty.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/notifier.h>
  30 #include <linux/cpu.h>
  31 #include <linux/unistd.h>
  32 #include <linux/serial.h>
  33 #include <linux/serial_8250.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/pci.h>
  36 #include <linux/lockdep.h>
  37 #include <linux/memblock.h>
  38 #include <asm/io.h>
  39 #include <asm/kdump.h>
  40 #include <asm/prom.h>
  41 #include <asm/processor.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/smp.h>
  44 #include <asm/elf.h>
  45 #include <asm/machdep.h>
  46 #include <asm/paca.h>
  47 #include <asm/time.h>
  48 #include <asm/cputable.h>
  49 #include <asm/sections.h>
  50 #include <asm/btext.h>
  51 #include <asm/nvram.h>
  52 #include <asm/setup.h>
  53 #include <asm/system.h>
  54 #include <asm/rtas.h>
  55 #include <asm/iommu.h>
  56 #include <asm/serial.h>
  57 #include <asm/cache.h>
  58 #include <asm/page.h>
  59 #include <asm/mmu.h>
  60 #include <asm/firmware.h>
  61 #include <asm/xmon.h>
  62 #include <asm/udbg.h>
  63 #include <asm/kexec.h>
  64 #include <asm/mmu_context.h>
  65 #include <asm/code-patching.h>
  66 #include <asm/kvm_ppc.h>
  67
  68 #include "setup.h"
  69
  70 #ifdef DEBUG
  71 #define DBG(fmt...) udbg_printf(fmt)
  72 #else
  73 #define DBG(fmt...)
  74 #endif
  75
  76 int boot_cpuid = 0;
  77 int spinning_secondaries;
  78 u64 ppc64_pft_size;
  79
  80 /* Pick defaults since we might want to patch instructions
  81  * before we've read this from the device tree.
  82  */
  83 struct ppc64_caches ppc64_caches = {
  84         .dline_size = 0x40,
  85         .log_dline_size = 6,
  86         .iline_size = 0x40,
  87         .log_iline_size = 6
  88 };
  89 EXPORT_SYMBOL_GPL(ppc64_caches);
  90
  91 /*
  92  * These are used in binfmt_elf.c to put aux entries on the stack
  93  * for each elf executable being started.
  94  */
  95 int dcache_bsize;
  96 int icache_bsize;
  97 int ucache_bsize;
  98
  99 #ifdef CONFIG_SMP
 100
 101 static char *smt_enabled_cmdline;
 102
 103 /* Look for ibm,smt-enabled OF option */
 104 static void check_smt_enabled(void)
 105 {
 106         struct device_node *dn;
 107         const char *smt_option;
 108
 109         /* Default to enabling all threads */
 110         smt_enabled_at_boot = threads_per_core;
 111
 112         /* Allow the command line to overrule the OF option */
 113         if (smt_enabled_cmdline) {
 114                 if (!strcmp(smt_enabled_cmdline, "on"))
 115                         smt_enabled_at_boot = threads_per_core;
 116                 else if (!strcmp(smt_enabled_cmdline, "off"))
 117                         smt_enabled_at_boot = 0;
 118                 else {
 119                         long smt;
 120                         int rc;
 121
 122                         rc = strict_strtol(smt_enabled_cmdline, 10, &smt);
 123                         if (!rc)
 124                                 smt_enabled_at_boot =
 125                                         min(threads_per_core, (int)smt);
 126                 }
 127         } else {
 128                 dn = of_find_node_by_path("/options");
 129                 if (dn) {
 130                         smt_option = of_get_property(dn, "ibm,smt-enabled",
 131                                                      NULL);
 132
 133                         if (smt_option) {
 134                                 if (!strcmp(smt_option, "on"))
 135                                         smt_enabled_at_boot = threads_per_core;
 136                                 else if (!strcmp(smt_option, "off"))
 137                                         smt_enabled_at_boot = 0;
 138                         }
 139
 140                         of_node_put(dn);
 141                 }
 142         }
 143 }
 144
 145 /* Look for smt-enabled= cmdline option */
 146 static int __init early_smt_enabled(char *p)
 147 {
 148         smt_enabled_cmdline = p;
 149         return 0;
 150 }
 151 early_param("smt-enabled", early_smt_enabled);
 152
 153 #else
 154 #define check_smt_enabled()
 155 #endif /* CONFIG_SMP */
 156
 157 /*
 158  * Early initialization entry point. This is called by head.S
 159  * with MMU translation disabled. We rely on the "feature" of
 160  * the CPU that ignores the top 2 bits of the address in real
 161  * mode so we can access kernel globals normally provided we
 162  * only toy with things in the RMO region. From here, we do
 163  * some early parsing of the device-tree to setup out MEMBLOCK
 164  * data structures, and allocate & initialize the hash table
 165  * and segment tables so we can start running with translation
 166  * enabled.
 167  *
 168  * It is this function which will call the probe() callback of
 169  * the various platform types and copy the matching one to the
 170  * global ppc_md structure. Your platform can eventually do
 171  * some very early initializations from the probe() routine, but
 172  * this is not recommended, be very careful as, for example, the
 173  * device-tree is not accessible via normal means at this point.
 174  */
 175
 176 void __init early_setup(unsigned long dt_ptr)
 177 {
 178         /* -------- printk is _NOT_ safe to use here ! ------- */
 179
 180         /* Identify CPU type */
 181         identify_cpu(0, mfspr(SPRN_PVR));
 182
 183         /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
 184         initialise_paca(&boot_paca, 0);
 185         setup_paca(&boot_paca);
 186
 187         /* Initialize lockdep early or else spinlocks will blow */
 188         lockdep_init();
 189
 190         /* -------- printk is now safe to use ------- */
 191
 192         /* Enable early debugging if any specified (see udbg.h) */
 193         udbg_early_init();
 194
 195         DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
 196
 197         /*
 198          * Do early initialization using the flattened device
 199          * tree, such as retrieving the physical memory map or
 200          * calculating/retrieving the hash table size.
 201          */
 202         early_init_devtree(__va(dt_ptr));
 203
 204         /* Now we know the logical id of our boot cpu, setup the paca. */
 205         setup_paca(&paca[boot_cpuid]);
 206
 207         /* Fix up paca fields required for the boot cpu */
 208         get_paca()->cpu_start = 1;
 209
 210         /* Probe the machine type */
 211         probe_machine();
 212
 213         setup_kdump_trampoline();
 214
 215         DBG("Found, Initializing memory management...\n");
 216
 217         /* Initialize the hash table or TLB handling */
 218         early_init_mmu();
 219
 220         DBG(" <- early_setup()\n");
 221 }
 222
 223 #ifdef CONFIG_SMP
 224 void early_setup_secondary(void)
 225 {
 226         /* Mark interrupts enabled in PACA */
 227         get_paca()->soft_enabled = 0;
 228
 229         /* Initialize the hash table or TLB handling */
 230         early_init_mmu_secondary();
 231 }
 232
 233 #endif /* CONFIG_SMP */
 234
 235 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
 236 void smp_release_cpus(void)
 237 {
 238         unsigned long *ptr;
 239         int i;
 240
 241         DBG(" -> smp_release_cpus()\n");
 242
 243         /* All secondary cpus are spinning on a common spinloop, release them
 244          * all now so they can start to spin on their individual paca
 245          * spinloops. For non SMP kernels, the secondary cpus never get out
 246          * of the common spinloop.
 247          */
 248
 249         ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
 250                         - PHYSICAL_START);
 251         *ptr = __pa(generic_secondary_smp_init);
 252
 253         /* And wait a bit for them to catch up */
 254         for (i = 0; i < 100000; i++) {
 255                 mb();
 256                 HMT_low();
 257                 if (spinning_secondaries == 0)
 258                         break;
 259                 udelay(1);
 260         }
 261         DBG("spinning_secondaries = %d\n", spinning_secondaries);
 262
 263         DBG(" <- smp_release_cpus()\n");
 264 }
 265 #endif /* CONFIG_SMP || CONFIG_KEXEC */
 266
 267 /*
 268  * Initialize some remaining members of the ppc64_caches and systemcfg
 269  * structures
 270  * (at least until we get rid of them completely). This is mostly some
 271  * cache informations about the CPU that will be used by cache flush
 272  * routines and/or provided to userland
 273  */
 274 static void __init initialize_cache_info(void)
 275 {
 276         struct device_node *np;
 277         unsigned long num_cpus = 0;
 278
 279         DBG(" -> initialize_cache_info()\n");
 280
 281         for_each_node_by_type(np, "cpu") {
 282                 num_cpus += 1;
 283
 284                 /*
 285                  * We're assuming *all* of the CPUs have the same
 286                  * d-cache and i-cache sizes... -Peter
 287                  */
 288                 if (num_cpus == 1) {
 289                         const u32 *sizep, *lsizep;
 290                         u32 size, lsize;
 291
 292                         size = 0;
 293                         lsize = cur_cpu_spec->dcache_bsize;
 294                         sizep = of_get_property(np, "d-cache-size", NULL);
 295                         if (sizep != NULL)
 296                                 size = *sizep;
 297                         lsizep = of_get_property(np, "d-cache-block-size",
 298                                                  NULL);
 299                         /* fallback if block size missing */
 300                         if (lsizep == NULL)
 301                                 lsizep = of_get_property(np,
 302                                                          "d-cache-line-size",
 303                                                          NULL);
 304                         if (lsizep != NULL)
 305                                 lsize = *lsizep;
 306                         if (sizep == 0 || lsizep == 0)
 307                                 DBG("Argh, can't find dcache properties ! "
 308                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 309
 310                         ppc64_caches.dsize = size;
 311                         ppc64_caches.dline_size = lsize;
 312                         ppc64_caches.log_dline_size = __ilog2(lsize);
 313                         ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
 314
 315                         size = 0;
 316                         lsize = cur_cpu_spec->icache_bsize;
 317                         sizep = of_get_property(np, "i-cache-size", NULL);
 318                         if (sizep != NULL)
 319                                 size = *sizep;
 320                         lsizep = of_get_property(np, "i-cache-block-size",
 321                                                  NULL);
 322                         if (lsizep == NULL)
 323                                 lsizep = of_get_property(np,
 324                                                          "i-cache-line-size",
 325                                                          NULL);
 326                         if (lsizep != NULL)
 327                                 lsize = *lsizep;
 328                         if (sizep == 0 || lsizep == 0)
 329                                 DBG("Argh, can't find icache properties ! "
 330                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 331
 332                         ppc64_caches.isize = size;
 333                         ppc64_caches.iline_size = lsize;
 334                         ppc64_caches.log_iline_size = __ilog2(lsize);
 335                         ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
 336                 }
 337         }
 338
 339         DBG(" <- initialize_cache_info()\n");
 340 }
 341
 342
 343 /*
 344  * Do some initial setup of the system.  The parameters are those which
 345  * were passed in from the bootloader.
 346  */
 347 void __init setup_system(void)
 348 {
 349         DBG(" -> setup_system()\n");
 350
 351         /* Apply the CPUs-specific and firmware specific fixups to kernel
 352          * text (nop out sections not relevant to this CPU or this firmware)
 353          */
 354         do_feature_fixups(cur_cpu_spec->cpu_features,
 355                           &__start___ftr_fixup, &__stop___ftr_fixup);
 356         do_feature_fixups(cur_cpu_spec->mmu_features,
 357                           &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
 358         do_feature_fixups(powerpc_firmware_features,
 359                           &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
 360         do_lwsync_fixups(cur_cpu_spec->cpu_features,
 361                          &__start___lwsync_fixup, &__stop___lwsync_fixup);
 362         do_final_fixups();
 363
 364         /*
 365          * Unflatten the device-tree passed by prom_init or kexec
 366          */
 367         unflatten_device_tree();
 368
 369         /*
 370          * Fill the ppc64_caches & systemcfg structures with informations
 371          * retrieved from the device-tree.
 372          */
 373         initialize_cache_info();
 374
 375 #ifdef CONFIG_PPC_RTAS
 376         /*
 377          * Initialize RTAS if available
 378          */
 379         rtas_initialize();
 380 #endif /* CONFIG_PPC_RTAS */
 381
 382         /*
 383          * Check if we have an initrd provided via the device-tree
 384          */
 385         check_for_initrd();
 386
 387         /*
 388          * Do some platform specific early initializations, that includes
 389          * setting up the hash table pointers. It also sets up some interrupt-mapping
 390          * related options that will be used by finish_device_tree()
 391          */
 392         if (ppc_md.init_early)
 393                 ppc_md.init_early();
 394
 395         /*
 396          * We can discover serial ports now since the above did setup the
 397          * hash table management for us, thus ioremap works. We do that early
 398          * so that further code can be debugged
 399          */
 400         find_legacy_serial_ports();
 401
 402         /*
 403          * Register early console
 404          */
 405         register_early_udbg_console();
 406
 407         /*
 408          * Initialize xmon
 409          */
 410         xmon_setup();
 411
 412         smp_setup_cpu_maps();
 413         check_smt_enabled();
 414
 415 #ifdef CONFIG_SMP
 416         /* Release secondary cpus out of their spinloops at 0x60 now that
 417          * we can map physical -> logical CPU ids
 418          */
 419         smp_release_cpus();
 420 #endif
 421
 422         printk("Starting Linux PPC64 %s\n", init_utsname()->version);
 423
 424         printk("-----------------------------------------------------\n");
 425         printk("ppc64_pft_size                = 0x%llx\n", ppc64_pft_size);
 426         printk("physicalMemorySize            = 0x%llx\n", memblock_phys_mem_size());
 427         if (ppc64_caches.dline_size != 0x80)
 428                 printk("ppc64_caches.dcache_line_size = 0x%x\n",
 429                        ppc64_caches.dline_size);
 430         if (ppc64_caches.iline_size != 0x80)
 431                 printk("ppc64_caches.icache_line_size = 0x%x\n",
 432                        ppc64_caches.iline_size);
 433 #ifdef CONFIG_PPC_STD_MMU_64
 434         if (htab_address)
 435                 printk("htab_address                  = 0x%p\n", htab_address);
 436         printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
 437 #endif /* CONFIG_PPC_STD_MMU_64 */
 438         if (PHYSICAL_START > 0)
 439                 printk("physical_start                = 0x%llx\n",
 440                        (unsigned long long)PHYSICAL_START);
 441         printk("-----------------------------------------------------\n");
 442
 443         DBG(" <- setup_system()\n");
 444 }
 445
 446 /* This returns the limit below which memory accesses to the linear
 447  * mapping are guarnateed not to cause a TLB or SLB miss. This is
 448  * used to allocate interrupt or emergency stacks for which our
 449  * exception entry path doesn't deal with being interrupted.
 450  */
 451 static u64 safe_stack_limit(void)
 452 {
 453 #ifdef CONFIG_PPC_BOOK3E
 454         /* Freescale BookE bolts the entire linear mapping */
 455         if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
 456                 return linear_map_top;
 457         /* Other BookE, we assume the first GB is bolted */
 458         return 1ul << 30;
 459 #else
 460         /* BookS, the first segment is bolted */
 461         if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
 462                 return 1UL << SID_SHIFT_1T;
 463         return 1UL << SID_SHIFT;
 464 #endif
 465 }
 466
 467 static void __init irqstack_early_init(void)
 468 {
 469         u64 limit = safe_stack_limit();
 470         unsigned int i;
 471
 472         /*
 473          * Interrupt stacks must be in the first segment since we
 474          * cannot afford to take SLB misses on them.
 475          */
 476         for_each_possible_cpu(i) {
 477                 softirq_ctx[i] = (struct thread_info *)
 478                         __va(memblock_alloc_base(THREAD_SIZE,
 479                                             THREAD_SIZE, limit));
 480                 hardirq_ctx[i] = (struct thread_info *)
 481                         __va(memblock_alloc_base(THREAD_SIZE,
 482                                             THREAD_SIZE, limit));
 483         }
 484 }
 485
 486 #ifdef CONFIG_PPC_BOOK3E
 487 static void __init exc_lvl_early_init(void)
 488 {
 489         extern unsigned int interrupt_base_book3e;
 490         extern unsigned int exc_debug_debug_book3e;
 491
 492         unsigned int i;
 493
 494         for_each_possible_cpu(i) {
 495                 critirq_ctx[i] = (struct thread_info *)
 496                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 497                 dbgirq_ctx[i] = (struct thread_info *)
 498                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 499                 mcheckirq_ctx[i] = (struct thread_info *)
 500                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 501         }
 502
 503         if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
 504                 patch_branch(&interrupt_base_book3e + (0x040 / 4) + 1,
 505                              (unsigned long)&exc_debug_debug_book3e, 0);
 506 }
 507 #else
 508 #define exc_lvl_early_init()
 509 #endif
 510
 511 /*
 512  * Stack space used when we detect a bad kernel stack pointer, and
 513  * early in SMP boots before relocation is enabled.
 514  */
 515 static void __init emergency_stack_init(void)
 516 {
 517         u64 limit;
 518         unsigned int i;
 519
 520         /*
 521          * Emergency stacks must be under 256MB, we cannot afford to take
 522          * SLB misses on them. The ABI also requires them to be 128-byte
 523          * aligned.
 524          *
 525          * Since we use these as temporary stacks during secondary CPU
 526          * bringup, we need to get at them in real mode. This means they
 527          * must also be within the RMO region.
 528          */
 529         limit = min(safe_stack_limit(), ppc64_rma_size);
 530
 531         for_each_possible_cpu(i) {
 532                 unsigned long sp;
 533                 sp  = memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
 534                 sp += THREAD_SIZE;
 535                 paca[i].emergency_sp = __va(sp);
 536         }
 537 }
 538
 539 /*
 540  * Called into from start_kernel this initializes bootmem, which is used
 541  * to manage page allocation until mem_init is called.
 542  */
 543 void __init setup_arch(char **cmdline_p)
 544 {
 545         ppc64_boot_msg(0x12, "Setup Arch");
 546
 547         *cmdline_p = cmd_line;
 548
 549         /*
 550          * Set cache line size based on type of cpu as a default.
 551          * Systems with OF can look in the properties on the cpu node(s)
 552          * for a possibly more accurate value.
 553          */
 554         dcache_bsize = ppc64_caches.dline_size;
 555         icache_bsize = ppc64_caches.iline_size;
 556
 557         /* reboot on panic */
 558         panic_timeout = 180;
 559
 560         if (ppc_md.panic)
 561                 setup_panic();
 562
 563         init_mm.start_code = (unsigned long)_stext;
 564         init_mm.end_code = (unsigned long) _etext;
 565         init_mm.end_data = (unsigned long) _edata;
 566         init_mm.brk = klimit;
 567
 568         irqstack_early_init();
 569         exc_lvl_early_init();
 570         emergency_stack_init();
 571
 572 #ifdef CONFIG_PPC_STD_MMU_64
 573         stabs_alloc();
 574 #endif
 575         /* set up the bootmem stuff with available memory */
 576         do_init_bootmem();
 577         sparse_init();
 578
 579 #ifdef CONFIG_DUMMY_CONSOLE
 580         conswitchp = &dummy_con;
 581 #endif
 582
 583         if (ppc_md.setup_arch)
 584                 ppc_md.setup_arch();
 585
 586         paging_init();
 587
 588         /* Initialize the MMU context management stuff */
 589         mmu_context_init();
 590
 591         kvm_rma_init();
 592
 593         ppc64_boot_msg(0x15, "Setup Done");
 594 }
 595
 596
 597 /* ToDo: do something useful if ppc_md is not yet setup. */
 598 #define PPC64_LINUX_FUNCTION 0x0f000000
 599 #define PPC64_IPL_MESSAGE 0xc0000000
 600 #define PPC64_TERM_MESSAGE 0xb0000000
 601
 602 static void ppc64_do_msg(unsigned int src, const char *msg)
 603 {
 604         if (ppc_md.progress) {
 605                 char buf[128];
 606
 607                 sprintf(buf, "%08X\n", src);
 608                 ppc_md.progress(buf, 0);
 609                 snprintf(buf, 128, "%s", msg);
 610                 ppc_md.progress(buf, 0);
 611         }
 612 }
 613
 614 /* Print a boot progress message. */
 615 void ppc64_boot_msg(unsigned int src, const char *msg)
 616 {
 617         ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
 618         printk("[boot]%04x %s\n", src, msg);
 619 }
 620
 621 #ifdef CONFIG_SMP
 622 #define PCPU_DYN_SIZE           ()
 623
 624 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
 625 {
 626         return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align,
 627                                     __pa(MAX_DMA_ADDRESS));
 628 }
 629
 630 static void __init pcpu_fc_free(void *ptr, size_t size)
 631 {
 632         free_bootmem(__pa(ptr), size);
 633 }
 634
 635 static int pcpu_cpu_distance(unsigned int from, unsigned int to)
 636 {
 637         if (cpu_to_node(from) == cpu_to_node(to))
 638                 return LOCAL_DISTANCE;
 639         else
 640                 return REMOTE_DISTANCE;
 641 }
 642
 643 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
 644 EXPORT_SYMBOL(__per_cpu_offset);
 645
 646 void __init setup_per_cpu_areas(void)
 647 {
 648         const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
 649         size_t atom_size;
 650         unsigned long delta;
 651         unsigned int cpu;
 652         int rc;
 653
 654         /*
 655          * Linear mapping is one of 4K, 1M and 16M.  For 4K, no need
 656          * to group units.  For larger mappings, use 1M atom which
 657          * should be large enough to contain a number of units.
 658          */
 659         if (mmu_linear_psize == MMU_PAGE_4K)
 660                 atom_size = PAGE_SIZE;
 661         else
 662                 atom_size = 1 << 20;
 663
 664         rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
 665                                     pcpu_fc_alloc, pcpu_fc_free);
 666         if (rc < 0)
 667                 panic("cannot initialize percpu area (err=%d)", rc);
 668
 669         delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
 670         for_each_possible_cpu(cpu) {
 671                 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
 672                 paca[cpu].data_offset = __per_cpu_offset[cpu];
 673         }
 674 }
 675 #endif
 676
 677
 678 #ifdef CONFIG_PPC_INDIRECT_IO
 679 struct ppc_pci_io ppc_pci_io;
 680 EXPORT_SYMBOL(ppc_pci_io);
 681 #endif /* CONFIG_PPC_INDIRECT_IO */
 682