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