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 __initdata 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 (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
 282                 num_cpus += 1;
 283
 284                 /* We're assuming *all* of the CPUs have the same
 285                  * d-cache and i-cache sizes... -Peter
 286                  */
 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", NULL);
 298                         /* fallback if block size missing */
 299                         if (lsizep == NULL)
 300                                 lsizep = of_get_property(np, "d-cache-line-size", NULL);
 301                         if (lsizep != NULL)
 302                                 lsize = *lsizep;
 303                         if (sizep == 0 || lsizep == 0)
 304                                 DBG("Argh, can't find dcache properties ! "
 305                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 306
 307                         ppc64_caches.dsize = size;
 308                         ppc64_caches.dline_size = lsize;
 309                         ppc64_caches.log_dline_size = __ilog2(lsize);
 310                         ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
 311
 312                         size = 0;
 313                         lsize = cur_cpu_spec->icache_bsize;
 314                         sizep = of_get_property(np, "i-cache-size", NULL);
 315                         if (sizep != NULL)
 316                                 size = *sizep;
 317                         lsizep = of_get_property(np, "i-cache-block-size", NULL);
 318                         if (lsizep == NULL)
 319                                 lsizep = of_get_property(np, "i-cache-line-size", NULL);
 320                         if (lsizep != NULL)
 321                                 lsize = *lsizep;
 322                         if (sizep == 0 || lsizep == 0)
 323                                 DBG("Argh, can't find icache properties ! "
 324                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 325
 326                         ppc64_caches.isize = size;
 327                         ppc64_caches.iline_size = lsize;
 328                         ppc64_caches.log_iline_size = __ilog2(lsize);
 329                         ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
 330                 }
 331         }
 332
 333         DBG(" <- initialize_cache_info()\n");
 334 }
 335
 336
 337 /*
 338  * Do some initial setup of the system.  The parameters are those which
 339  * were passed in from the bootloader.
 340  */
 341 void __init setup_system(void)
 342 {
 343         DBG(" -> setup_system()\n");
 344
 345         /* Apply the CPUs-specific and firmware specific fixups to kernel
 346          * text (nop out sections not relevant to this CPU or this firmware)
 347          */
 348         do_feature_fixups(cur_cpu_spec->cpu_features,
 349                           &__start___ftr_fixup, &__stop___ftr_fixup);
 350         do_feature_fixups(cur_cpu_spec->mmu_features,
 351                           &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
 352         do_feature_fixups(powerpc_firmware_features,
 353                           &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
 354         do_lwsync_fixups(cur_cpu_spec->cpu_features,
 355                          &__start___lwsync_fixup, &__stop___lwsync_fixup);
 356
 357         /*
 358          * Unflatten the device-tree passed by prom_init or kexec
 359          */
 360         unflatten_device_tree();
 361
 362         /*
 363          * Fill the ppc64_caches & systemcfg structures with informations
 364          * retrieved from the device-tree.
 365          */
 366         initialize_cache_info();
 367
 368 #ifdef CONFIG_PPC_RTAS
 369         /*
 370          * Initialize RTAS if available
 371          */
 372         rtas_initialize();
 373 #endif /* CONFIG_PPC_RTAS */
 374
 375         /*
 376          * Check if we have an initrd provided via the device-tree
 377          */
 378         check_for_initrd();
 379
 380         /*
 381          * Do some platform specific early initializations, that includes
 382          * setting up the hash table pointers. It also sets up some interrupt-mapping
 383          * related options that will be used by finish_device_tree()
 384          */
 385         if (ppc_md.init_early)
 386                 ppc_md.init_early();
 387
 388         /*
 389          * We can discover serial ports now since the above did setup the
 390          * hash table management for us, thus ioremap works. We do that early
 391          * so that further code can be debugged
 392          */
 393         find_legacy_serial_ports();
 394
 395         /*
 396          * Register early console
 397          */
 398         register_early_udbg_console();
 399
 400         /*
 401          * Initialize xmon
 402          */
 403         xmon_setup();
 404
 405         smp_setup_cpu_maps();
 406         check_smt_enabled();
 407
 408 #ifdef CONFIG_SMP
 409         /* Release secondary cpus out of their spinloops at 0x60 now that
 410          * we can map physical -> logical CPU ids
 411          */
 412         smp_release_cpus();
 413 #endif
 414
 415         printk("Starting Linux PPC64 %s\n", init_utsname()->version);
 416
 417         printk("-----------------------------------------------------\n");
 418         printk("ppc64_pft_size                = 0x%llx\n", ppc64_pft_size);
 419         printk("physicalMemorySize            = 0x%llx\n", memblock_phys_mem_size());
 420         if (ppc64_caches.dline_size != 0x80)
 421                 printk("ppc64_caches.dcache_line_size = 0x%x\n",
 422                        ppc64_caches.dline_size);
 423         if (ppc64_caches.iline_size != 0x80)
 424                 printk("ppc64_caches.icache_line_size = 0x%x\n",
 425                        ppc64_caches.iline_size);
 426 #ifdef CONFIG_PPC_STD_MMU_64
 427         if (htab_address)
 428                 printk("htab_address                  = 0x%p\n", htab_address);
 429         printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
 430 #endif /* CONFIG_PPC_STD_MMU_64 */
 431         if (PHYSICAL_START > 0)
 432                 printk("physical_start                = 0x%llx\n",
 433                        (unsigned long long)PHYSICAL_START);
 434         printk("-----------------------------------------------------\n");
 435
 436         DBG(" <- setup_system()\n");
 437 }
 438
 439 /* This returns the limit below which memory accesses to the linear
 440  * mapping are guarnateed not to cause a TLB or SLB miss. This is
 441  * used to allocate interrupt or emergency stacks for which our
 442  * exception entry path doesn't deal with being interrupted.
 443  */
 444 static u64 safe_stack_limit(void)
 445 {
 446 #ifdef CONFIG_PPC_BOOK3E
 447         /* Freescale BookE bolts the entire linear mapping */
 448         if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
 449                 return linear_map_top;
 450         /* Other BookE, we assume the first GB is bolted */
 451         return 1ul << 30;
 452 #else
 453         /* BookS, the first segment is bolted */
 454         if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
 455                 return 1UL << SID_SHIFT_1T;
 456         return 1UL << SID_SHIFT;
 457 #endif
 458 }
 459
 460 static void __init irqstack_early_init(void)
 461 {
 462         u64 limit = safe_stack_limit();
 463         unsigned int i;
 464
 465         /*
 466          * Interrupt stacks must be in the first segment since we
 467          * cannot afford to take SLB misses on them.
 468          */
 469         for_each_possible_cpu(i) {
 470                 softirq_ctx[i] = (struct thread_info *)
 471                         __va(memblock_alloc_base(THREAD_SIZE,
 472                                             THREAD_SIZE, limit));
 473                 hardirq_ctx[i] = (struct thread_info *)
 474                         __va(memblock_alloc_base(THREAD_SIZE,
 475                                             THREAD_SIZE, limit));
 476         }
 477 }
 478
 479 #ifdef CONFIG_PPC_BOOK3E
 480 static void __init exc_lvl_early_init(void)
 481 {
 482         extern unsigned int interrupt_base_book3e;
 483         extern unsigned int exc_debug_debug_book3e;
 484
 485         unsigned int i;
 486
 487         for_each_possible_cpu(i) {
 488                 critirq_ctx[i] = (struct thread_info *)
 489                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 490                 dbgirq_ctx[i] = (struct thread_info *)
 491                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 492                 mcheckirq_ctx[i] = (struct thread_info *)
 493                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 494         }
 495
 496         if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
 497                 patch_branch(&interrupt_base_book3e + (0x040 / 4) + 1,
 498                              (unsigned long)&exc_debug_debug_book3e, 0);
 499 }
 500 #else
 501 #define exc_lvl_early_init()
 502 #endif
 503
 504 /*
 505  * Stack space used when we detect a bad kernel stack pointer, and
 506  * early in SMP boots before relocation is enabled.
 507  */
 508 static void __init emergency_stack_init(void)
 509 {
 510         u64 limit;
 511         unsigned int i;
 512
 513         /*
 514          * Emergency stacks must be under 256MB, we cannot afford to take
 515          * SLB misses on them. The ABI also requires them to be 128-byte
 516          * aligned.
 517          *
 518          * Since we use these as temporary stacks during secondary CPU
 519          * bringup, we need to get at them in real mode. This means they
 520          * must also be within the RMO region.
 521          */
 522         limit = min(safe_stack_limit(), ppc64_rma_size);
 523
 524         for_each_possible_cpu(i) {
 525                 unsigned long sp;
 526                 sp  = memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
 527                 sp += THREAD_SIZE;
 528                 paca[i].emergency_sp = __va(sp);
 529         }
 530 }
 531
 532 /*
 533  * Called into from start_kernel this initializes bootmem, which is used
 534  * to manage page allocation until mem_init is called.
 535  */
 536 void __init setup_arch(char **cmdline_p)
 537 {
 538         ppc64_boot_msg(0x12, "Setup Arch");
 539
 540         *cmdline_p = cmd_line;
 541
 542         /*
 543          * Set cache line size based on type of cpu as a default.
 544          * Systems with OF can look in the properties on the cpu node(s)
 545          * for a possibly more accurate value.
 546          */
 547         dcache_bsize = ppc64_caches.dline_size;
 548         icache_bsize = ppc64_caches.iline_size;
 549
 550         /* reboot on panic */
 551         panic_timeout = 180;
 552
 553         if (ppc_md.panic)
 554                 setup_panic();
 555
 556         init_mm.start_code = (unsigned long)_stext;
 557         init_mm.end_code = (unsigned long) _etext;
 558         init_mm.end_data = (unsigned long) _edata;
 559         init_mm.brk = klimit;
 560
 561         irqstack_early_init();
 562         exc_lvl_early_init();
 563         emergency_stack_init();
 564
 565 #ifdef CONFIG_PPC_STD_MMU_64
 566         stabs_alloc();
 567 #endif
 568         /* set up the bootmem stuff with available memory */
 569         do_init_bootmem();
 570         sparse_init();
 571
 572 #ifdef CONFIG_DUMMY_CONSOLE
 573         conswitchp = &dummy_con;
 574 #endif
 575
 576         if (ppc_md.setup_arch)
 577                 ppc_md.setup_arch();
 578
 579         paging_init();
 580
 581         /* Initialize the MMU context management stuff */
 582         mmu_context_init();
 583
 584         kvm_rma_init();
 585
 586         ppc64_boot_msg(0x15, "Setup Done");
 587 }
 588
 589
 590 /* ToDo: do something useful if ppc_md is not yet setup. */
 591 #define PPC64_LINUX_FUNCTION 0x0f000000
 592 #define PPC64_IPL_MESSAGE 0xc0000000
 593 #define PPC64_TERM_MESSAGE 0xb0000000
 594
 595 static void ppc64_do_msg(unsigned int src, const char *msg)
 596 {
 597         if (ppc_md.progress) {
 598                 char buf[128];
 599
 600                 sprintf(buf, "%08X\n", src);
 601                 ppc_md.progress(buf, 0);
 602                 snprintf(buf, 128, "%s", msg);
 603                 ppc_md.progress(buf, 0);
 604         }
 605 }
 606
 607 /* Print a boot progress message. */
 608 void ppc64_boot_msg(unsigned int src, const char *msg)
 609 {
 610         ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
 611         printk("[boot]%04x %s\n", src, msg);
 612 }
 613
 614 #ifdef CONFIG_SMP
 615 #define PCPU_DYN_SIZE           ()
 616
 617 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
 618 {
 619         return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align,
 620                                     __pa(MAX_DMA_ADDRESS));
 621 }
 622
 623 static void __init pcpu_fc_free(void *ptr, size_t size)
 624 {
 625         free_bootmem(__pa(ptr), size);
 626 }
 627
 628 static int pcpu_cpu_distance(unsigned int from, unsigned int to)
 629 {
 630         if (cpu_to_node(from) == cpu_to_node(to))
 631                 return LOCAL_DISTANCE;
 632         else
 633                 return REMOTE_DISTANCE;
 634 }
 635
 636 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
 637 EXPORT_SYMBOL(__per_cpu_offset);
 638
 639 void __init setup_per_cpu_areas(void)
 640 {
 641         const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
 642         size_t atom_size;
 643         unsigned long delta;
 644         unsigned int cpu;
 645         int rc;
 646
 647         /*
 648          * Linear mapping is one of 4K, 1M and 16M.  For 4K, no need
 649          * to group units.  For larger mappings, use 1M atom which
 650          * should be large enough to contain a number of units.
 651          */
 652         if (mmu_linear_psize == MMU_PAGE_4K)
 653                 atom_size = PAGE_SIZE;
 654         else
 655                 atom_size = 1 << 20;
 656
 657         rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
 658                                     pcpu_fc_alloc, pcpu_fc_free);
 659         if (rc < 0)
 660                 panic("cannot initialize percpu area (err=%d)", rc);
 661
 662         delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
 663         for_each_possible_cpu(cpu) {
 664                 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
 665                 paca[cpu].data_offset = __per_cpu_offset[cpu];
 666         }
 667 }
 668 #endif
 669
 670
 671 #ifdef CONFIG_PPC_INDIRECT_IO
 672 struct ppc_pci_io ppc_pci_io;
 673 EXPORT_SYMBOL(ppc_pci_io);
 674 #endif /* CONFIG_PPC_INDIRECT_IO */
 675