arch/ppc64/mm/init.c

   1 /*
   2  *  PowerPC version
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *
   5  *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
   6  *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
   7  *    Copyright (C) 1996 Paul Mackerras
   8  *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
   9  *
  10  *  Derived from "arch/i386/mm/init.c"
  11  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
  12  *
  13  *  Dave Engebretsen <engebret@us.ibm.com>
  14  *      Rework for PPC64 port.
  15  *
  16  *  This program is free software; you can redistribute it and/or
  17  *  modify it under the terms of the GNU General Public License
  18  *  as published by the Free Software Foundation; either version
  19  *  2 of the License, or (at your option) any later version.
  20  *
  21  */
  22
  23 #include <linux/config.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/kernel.h>
  27 #include <linux/errno.h>
  28 #include <linux/string.h>
  29 #include <linux/types.h>
  30 #include <linux/mman.h>
  31 #include <linux/mm.h>
  32 #include <linux/swap.h>
  33 #include <linux/stddef.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/bootmem.h>
  38 #include <linux/highmem.h>
  39 #include <linux/idr.h>
  40 #include <linux/nodemask.h>
  41 #include <linux/module.h>
  42
  43 #include <asm/pgalloc.h>
  44 #include <asm/page.h>
  45 #include <asm/prom.h>
  46 #include <asm/lmb.h>
  47 #include <asm/rtas.h>
  48 #include <asm/io.h>
  49 #include <asm/mmu_context.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/mmu.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/smp.h>
  54 #include <asm/machdep.h>
  55 #include <asm/tlb.h>
  56 #include <asm/eeh.h>
  57 #include <asm/processor.h>
  58 #include <asm/mmzone.h>
  59 #include <asm/cputable.h>
  60 #include <asm/ppcdebug.h>
  61 #include <asm/sections.h>
  62 #include <asm/system.h>
  63 #include <asm/iommu.h>
  64 #include <asm/abs_addr.h>
  65 #include <asm/vdso.h>
  66 #include <asm/imalloc.h>
  67
  68 #if PGTABLE_RANGE > USER_VSID_RANGE
  69 #warning Limited user VSID range means pagetable space is wasted
  70 #endif
  71
  72 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
  73 #warning TASK_SIZE is smaller than it needs to be.
  74 #endif
  75
  76 int mem_init_done;
  77 unsigned long ioremap_bot = IMALLOC_BASE;
  78 static unsigned long phbs_io_bot = PHBS_IO_BASE;
  79
  80 extern pgd_t swapper_pg_dir[];
  81 extern struct task_struct *current_set[NR_CPUS];
  82
  83 unsigned long klimit = (unsigned long)_end;
  84
  85 unsigned long _SDR1=0;
  86 unsigned long _ASR=0;
  87
  88 /* max amount of RAM to use */
  89 unsigned long __max_memory;
  90
  91 /* info on what we think the IO hole is */
  92 unsigned long   io_hole_start;
  93 unsigned long   io_hole_size;
  94
  95 void show_mem(void)
  96 {
  97         unsigned long total = 0, reserved = 0;
  98         unsigned long shared = 0, cached = 0;
  99         struct page *page;
 100         pg_data_t *pgdat;
 101         unsigned long i;
 102
 103         printk("Mem-info:\n");
 104         show_free_areas();
 105         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 106         for_each_pgdat(pgdat) {
 107                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 108                         page = pgdat_page_nr(pgdat, i);
 109                         total++;
 110                         if (PageReserved(page))
 111                                 reserved++;
 112                         else if (PageSwapCache(page))
 113                                 cached++;
 114                         else if (page_count(page))
 115                                 shared += page_count(page) - 1;
 116                 }
 117         }
 118         printk("%ld pages of RAM\n", total);
 119         printk("%ld reserved pages\n", reserved);
 120         printk("%ld pages shared\n", shared);
 121         printk("%ld pages swap cached\n", cached);
 122 }
 123
 124 #ifdef CONFIG_PPC_ISERIES
 125
 126 void __iomem *ioremap(unsigned long addr, unsigned long size)
 127 {
 128         return (void __iomem *)addr;
 129 }
 130
 131 extern void __iomem *__ioremap(unsigned long addr, unsigned long size,
 132                        unsigned long flags)
 133 {
 134         return (void __iomem *)addr;
 135 }
 136
 137 void iounmap(volatile void __iomem *addr)
 138 {
 139         return;
 140 }
 141
 142 #else
 143
 144 /*
 145  * map_io_page currently only called by __ioremap
 146  * map_io_page adds an entry to the ioremap page table
 147  * and adds an entry to the HPT, possibly bolting it
 148  */
 149 static int map_io_page(unsigned long ea, unsigned long pa, int flags)
 150 {
 151         pgd_t *pgdp;
 152         pud_t *pudp;
 153         pmd_t *pmdp;
 154         pte_t *ptep;
 155         unsigned long vsid;
 156
 157         if (mem_init_done) {
 158                 spin_lock(&init_mm.page_table_lock);
 159                 pgdp = pgd_offset_k(ea);
 160                 pudp = pud_alloc(&init_mm, pgdp, ea);
 161                 if (!pudp)
 162                         return -ENOMEM;
 163                 pmdp = pmd_alloc(&init_mm, pudp, ea);
 164                 if (!pmdp)
 165                         return -ENOMEM;
 166                 ptep = pte_alloc_kernel(&init_mm, pmdp, ea);
 167                 if (!ptep)
 168                         return -ENOMEM;
 169                 set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
 170                                                           __pgprot(flags)));
 171                 spin_unlock(&init_mm.page_table_lock);
 172         } else {
 173                 unsigned long va, vpn, hash, hpteg;
 174
 175                 /*
 176                  * If the mm subsystem is not fully up, we cannot create a
 177                  * linux page table entry for this mapping.  Simply bolt an
 178                  * entry in the hardware page table.
 179                  */
 180                 vsid = get_kernel_vsid(ea);
 181                 va = (vsid << 28) | (ea & 0xFFFFFFF);
 182                 vpn = va >> PAGE_SHIFT;
 183
 184                 hash = hpt_hash(vpn, 0);
 185
 186                 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
 187
 188                 /* Panic if a pte grpup is full */
 189                 if (ppc_md.hpte_insert(hpteg, va, pa >> PAGE_SHIFT,
 190                                        HPTE_V_BOLTED,
 191                                        _PAGE_NO_CACHE|_PAGE_GUARDED|PP_RWXX)
 192                     == -1) {
 193                         panic("map_io_page: could not insert mapping");
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199
 200 static void __iomem * __ioremap_com(unsigned long addr, unsigned long pa,
 201                             unsigned long ea, unsigned long size,
 202                             unsigned long flags)
 203 {
 204         unsigned long i;
 205
 206         if ((flags & _PAGE_PRESENT) == 0)
 207                 flags |= pgprot_val(PAGE_KERNEL);
 208
 209         for (i = 0; i < size; i += PAGE_SIZE)
 210                 if (map_io_page(ea+i, pa+i, flags))
 211                         return NULL;
 212
 213         return (void __iomem *) (ea + (addr & ~PAGE_MASK));
 214 }
 215
 216
 217 void __iomem *
 218 ioremap(unsigned long addr, unsigned long size)
 219 {
 220         return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED);
 221 }
 222
 223 void __iomem * __ioremap(unsigned long addr, unsigned long size,
 224                          unsigned long flags)
 225 {
 226         unsigned long pa, ea;
 227         void __iomem *ret;
 228
 229         /*
 230          * Choose an address to map it to.
 231          * Once the imalloc system is running, we use it.
 232          * Before that, we map using addresses going
 233          * up from ioremap_bot.  imalloc will use
 234          * the addresses from ioremap_bot through
 235          * IMALLOC_END
 236          *
 237          */
 238         pa = addr & PAGE_MASK;
 239         size = PAGE_ALIGN(addr + size) - pa;
 240
 241         if (size == 0)
 242                 return NULL;
 243
 244         if (mem_init_done) {
 245                 struct vm_struct *area;
 246                 area = im_get_free_area(size);
 247                 if (area == NULL)
 248                         return NULL;
 249                 ea = (unsigned long)(area->addr);
 250                 ret = __ioremap_com(addr, pa, ea, size, flags);
 251                 if (!ret)
 252                         im_free(area->addr);
 253         } else {
 254                 ea = ioremap_bot;
 255                 ret = __ioremap_com(addr, pa, ea, size, flags);
 256                 if (ret)
 257                         ioremap_bot += size;
 258         }
 259         return ret;
 260 }
 261
 262 #define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
 263
 264 int __ioremap_explicit(unsigned long pa, unsigned long ea,
 265                        unsigned long size, unsigned long flags)
 266 {
 267         struct vm_struct *area;
 268         void __iomem *ret;
 269
 270         /* For now, require page-aligned values for pa, ea, and size */
 271         if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
 272             !IS_PAGE_ALIGNED(size)) {
 273                 printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__);
 274                 return 1;
 275         }
 276
 277         if (!mem_init_done) {
 278                 /* Two things to consider in this case:
 279                  * 1) No records will be kept (imalloc, etc) that the region
 280                  *    has been remapped
 281                  * 2) It won't be easy to iounmap() the region later (because
 282                  *    of 1)
 283                  */
 284                 ;
 285         } else {
 286                 area = im_get_area(ea, size,
 287                         IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS);
 288                 if (area == NULL) {
 289                         /* Expected when PHB-dlpar is in play */
 290                         return 1;
 291                 }
 292                 if (ea != (unsigned long) area->addr) {
 293                         printk(KERN_ERR "unexpected addr return from "
 294                                "im_get_area\n");
 295                         return 1;
 296                 }
 297         }
 298
 299         ret = __ioremap_com(pa, pa, ea, size, flags);
 300         if (ret == NULL) {
 301                 printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
 302                 return 1;
 303         }
 304         if (ret != (void *) ea) {
 305                 printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
 306                 return 1;
 307         }
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * Unmap an IO region and remove it from imalloc'd list.
 314  * Access to IO memory should be serialized by driver.
 315  * This code is modeled after vmalloc code - unmap_vm_area()
 316  *
 317  * XXX  what about calls before mem_init_done (ie python_countermeasures())
 318  */
 319 void iounmap(volatile void __iomem *token)
 320 {
 321         void *addr;
 322
 323         if (!mem_init_done)
 324                 return;
 325
 326         addr = (void *) ((unsigned long __force) token & PAGE_MASK);
 327
 328         im_free(addr);
 329 }
 330
 331 static int iounmap_subset_regions(unsigned long addr, unsigned long size)
 332 {
 333         struct vm_struct *area;
 334
 335         /* Check whether subsets of this region exist */
 336         area = im_get_area(addr, size, IM_REGION_SUPERSET);
 337         if (area == NULL)
 338                 return 1;
 339
 340         while (area) {
 341                 iounmap((void __iomem *) area->addr);
 342                 area = im_get_area(addr, size,
 343                                 IM_REGION_SUPERSET);
 344         }
 345
 346         return 0;
 347 }
 348
 349 int iounmap_explicit(volatile void __iomem *start, unsigned long size)
 350 {
 351         struct vm_struct *area;
 352         unsigned long addr;
 353         int rc;
 354
 355         addr = (unsigned long __force) start & PAGE_MASK;
 356
 357         /* Verify that the region either exists or is a subset of an existing
 358          * region.  In the latter case, split the parent region to create
 359          * the exact region
 360          */
 361         area = im_get_area(addr, size,
 362                             IM_REGION_EXISTS | IM_REGION_SUBSET);
 363         if (area == NULL) {
 364                 /* Determine whether subset regions exist.  If so, unmap */
 365                 rc = iounmap_subset_regions(addr, size);
 366                 if (rc) {
 367                         printk(KERN_ERR
 368                                "%s() cannot unmap nonexistent range 0x%lx\n",
 369                                 __FUNCTION__, addr);
 370                         return 1;
 371                 }
 372         } else {
 373                 iounmap((void __iomem *) area->addr);
 374         }
 375         /*
 376          * FIXME! This can't be right:
 377         iounmap(area->addr);
 378          * Maybe it should be "iounmap(area);"
 379          */
 380         return 0;
 381 }
 382
 383 #endif
 384
 385 EXPORT_SYMBOL(ioremap);
 386 EXPORT_SYMBOL(__ioremap);
 387 EXPORT_SYMBOL(iounmap);
 388
 389 void free_initmem(void)
 390 {
 391         unsigned long addr;
 392
 393         addr = (unsigned long)__init_begin;
 394         for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
 395                 memset((void *)addr, 0xcc, PAGE_SIZE);
 396                 ClearPageReserved(virt_to_page(addr));
 397                 set_page_count(virt_to_page(addr), 1);
 398                 free_page(addr);
 399                 totalram_pages++;
 400         }
 401         printk ("Freeing unused kernel memory: %luk freed\n",
 402                 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
 403 }
 404
 405 #ifdef CONFIG_BLK_DEV_INITRD
 406 void free_initrd_mem(unsigned long start, unsigned long end)
 407 {
 408         if (start < end)
 409                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 410         for (; start < end; start += PAGE_SIZE) {
 411                 ClearPageReserved(virt_to_page(start));
 412                 set_page_count(virt_to_page(start), 1);
 413                 free_page(start);
 414                 totalram_pages++;
 415         }
 416 }
 417 #endif
 418
 419 static DEFINE_SPINLOCK(mmu_context_lock);
 420 static DEFINE_IDR(mmu_context_idr);
 421
 422 int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 423 {
 424         int index;
 425         int err;
 426
 427 again:
 428         if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL))
 429                 return -ENOMEM;
 430
 431         spin_lock(&mmu_context_lock);
 432         err = idr_get_new_above(&mmu_context_idr, NULL, 1, &index);
 433         spin_unlock(&mmu_context_lock);
 434
 435         if (err == -EAGAIN)
 436                 goto again;
 437         else if (err)
 438                 return err;
 439
 440         if (index > MAX_CONTEXT) {
 441                 idr_remove(&mmu_context_idr, index);
 442                 return -ENOMEM;
 443         }
 444
 445         mm->context.id = index;
 446
 447         return 0;
 448 }
 449
 450 void destroy_context(struct mm_struct *mm)
 451 {
 452         spin_lock(&mmu_context_lock);
 453         idr_remove(&mmu_context_idr, mm->context.id);
 454         spin_unlock(&mmu_context_lock);
 455
 456         mm->context.id = NO_CONTEXT;
 457 }
 458
 459 /*
 460  * Do very early mm setup.
 461  */
 462 void __init mm_init_ppc64(void)
 463 {
 464 #ifndef CONFIG_PPC_ISERIES
 465         unsigned long i;
 466 #endif
 467
 468         ppc64_boot_msg(0x100, "MM Init");
 469
 470         /* This is the story of the IO hole... please, keep seated,
 471          * unfortunately, we are out of oxygen masks at the moment.
 472          * So we need some rough way to tell where your big IO hole
 473          * is. On pmac, it's between 2G and 4G, on POWER3, it's around
 474          * that area as well, on POWER4 we don't have one, etc...
 475          * We need that as a "hint" when sizing the TCE table on POWER3
 476          * So far, the simplest way that seem work well enough for us it
 477          * to just assume that the first discontinuity in our physical
 478          * RAM layout is the IO hole. That may not be correct in the future
 479          * (and isn't on iSeries but then we don't care ;)
 480          */
 481
 482 #ifndef CONFIG_PPC_ISERIES
 483         for (i = 1; i < lmb.memory.cnt; i++) {
 484                 unsigned long base, prevbase, prevsize;
 485
 486                 prevbase = lmb.memory.region[i-1].base;
 487                 prevsize = lmb.memory.region[i-1].size;
 488                 base = lmb.memory.region[i].base;
 489                 if (base > (prevbase + prevsize)) {
 490                         io_hole_start = prevbase + prevsize;
 491                         io_hole_size = base  - (prevbase + prevsize);
 492                         break;
 493                 }
 494         }
 495 #endif /* CONFIG_PPC_ISERIES */
 496         if (io_hole_start)
 497                 printk("IO Hole assumed to be %lx -> %lx\n",
 498                        io_hole_start, io_hole_start + io_hole_size - 1);
 499
 500         ppc64_boot_msg(0x100, "MM Init Done");
 501 }
 502
 503 /*
 504  * This is called by /dev/mem to know if a given address has to
 505  * be mapped non-cacheable or not
 506  */
 507 int page_is_ram(unsigned long pfn)
 508 {
 509         int i;
 510         unsigned long paddr = (pfn << PAGE_SHIFT);
 511
 512         for (i=0; i < lmb.memory.cnt; i++) {
 513                 unsigned long base;
 514
 515                 base = lmb.memory.region[i].base;
 516
 517                 if ((paddr >= base) &&
 518                         (paddr < (base + lmb.memory.region[i].size))) {
 519                         return 1;
 520                 }
 521         }
 522
 523         return 0;
 524 }
 525 EXPORT_SYMBOL(page_is_ram);
 526
 527 /*
 528  * Initialize the bootmem system and give it all the memory we
 529  * have available.
 530  */
 531 #ifndef CONFIG_NEED_MULTIPLE_NODES
 532 void __init do_init_bootmem(void)
 533 {
 534         unsigned long i;
 535         unsigned long start, bootmap_pages;
 536         unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
 537         int boot_mapsize;
 538
 539         /*
 540          * Find an area to use for the bootmem bitmap.  Calculate the size of
 541          * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
 542          * Add 1 additional page in case the address isn't page-aligned.
 543          */
 544         bootmap_pages = bootmem_bootmap_pages(total_pages);
 545
 546         start = lmb_alloc(bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
 547         BUG_ON(!start);
 548
 549         boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
 550
 551         max_pfn = max_low_pfn;
 552
 553         /* Add all physical memory to the bootmem map, mark each area
 554          * present.
 555          */
 556         for (i=0; i < lmb.memory.cnt; i++)
 557                 free_bootmem(lmb.memory.region[i].base,
 558                              lmb_size_bytes(&lmb.memory, i));
 559
 560         /* reserve the sections we're already using */
 561         for (i=0; i < lmb.reserved.cnt; i++)
 562                 reserve_bootmem(lmb.reserved.region[i].base,
 563                                 lmb_size_bytes(&lmb.reserved, i));
 564
 565         for (i=0; i < lmb.memory.cnt; i++)
 566                 memory_present(0, lmb_start_pfn(&lmb.memory, i),
 567                                lmb_end_pfn(&lmb.memory, i));
 568 }
 569
 570 /*
 571  * paging_init() sets up the page tables - in fact we've already done this.
 572  */
 573 void __init paging_init(void)
 574 {
 575         unsigned long zones_size[MAX_NR_ZONES];
 576         unsigned long zholes_size[MAX_NR_ZONES];
 577         unsigned long total_ram = lmb_phys_mem_size();
 578         unsigned long top_of_ram = lmb_end_of_DRAM();
 579
 580         printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
 581                top_of_ram, total_ram);
 582         printk(KERN_INFO "Memory hole size: %ldMB\n",
 583                (top_of_ram - total_ram) >> 20);
 584         /*
 585          * All pages are DMA-able so we put them all in the DMA zone.
 586          */
 587         memset(zones_size, 0, sizeof(zones_size));
 588         memset(zholes_size, 0, sizeof(zholes_size));
 589
 590         zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
 591         zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
 592
 593         free_area_init_node(0, NODE_DATA(0), zones_size,
 594                             __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
 595 }
 596 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
 597
 598 static struct kcore_list kcore_vmem;
 599
 600 static int __init setup_kcore(void)
 601 {
 602         int i;
 603
 604         for (i=0; i < lmb.memory.cnt; i++) {
 605                 unsigned long base, size;
 606                 struct kcore_list *kcore_mem;
 607
 608                 base = lmb.memory.region[i].base;
 609                 size = lmb.memory.region[i].size;
 610
 611                 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
 612                 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
 613                 if (!kcore_mem)
 614                         panic("mem_init: kmalloc failed\n");
 615
 616                 kclist_add(kcore_mem, __va(base), size);
 617         }
 618
 619         kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
 620
 621         return 0;
 622 }
 623 module_init(setup_kcore);
 624
 625 void __init mem_init(void)
 626 {
 627 #ifdef CONFIG_NEED_MULTIPLE_NODES
 628         int nid;
 629 #endif
 630         pg_data_t *pgdat;
 631         unsigned long i;
 632         struct page *page;
 633         unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
 634
 635         num_physpages = max_low_pfn;    /* RAM is assumed contiguous */
 636         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 637
 638 #ifdef CONFIG_NEED_MULTIPLE_NODES
 639         for_each_online_node(nid) {
 640                 if (NODE_DATA(nid)->node_spanned_pages != 0) {
 641                         printk("freeing bootmem node %x\n", nid);
 642                         totalram_pages +=
 643                                 free_all_bootmem_node(NODE_DATA(nid));
 644                 }
 645         }
 646 #else
 647         max_mapnr = num_physpages;
 648         totalram_pages += free_all_bootmem();
 649 #endif
 650
 651         for_each_pgdat(pgdat) {
 652                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 653                         page = pgdat_page_nr(pgdat, i);
 654                         if (PageReserved(page))
 655                                 reservedpages++;
 656                 }
 657         }
 658
 659         codesize = (unsigned long)&_etext - (unsigned long)&_stext;
 660         initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
 661         datasize = (unsigned long)&_edata - (unsigned long)&__init_end;
 662         bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
 663
 664         printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
 665                "%luk reserved, %luk data, %luk bss, %luk init)\n",
 666                 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 667                 num_physpages << (PAGE_SHIFT-10),
 668                 codesize >> 10,
 669                 reservedpages << (PAGE_SHIFT-10),
 670                 datasize >> 10,
 671                 bsssize >> 10,
 672                 initsize >> 10);
 673
 674         mem_init_done = 1;
 675
 676         /* Initialize the vDSO */
 677         vdso_init();
 678 }
 679
 680 /*
 681  * This is called when a page has been modified by the kernel.
 682  * It just marks the page as not i-cache clean.  We do the i-cache
 683  * flush later when the page is given to a user process, if necessary.
 684  */
 685 void flush_dcache_page(struct page *page)
 686 {
 687         if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
 688                 return;
 689         /* avoid an atomic op if possible */
 690         if (test_bit(PG_arch_1, &page->flags))
 691                 clear_bit(PG_arch_1, &page->flags);
 692 }
 693 EXPORT_SYMBOL(flush_dcache_page);
 694
 695 void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
 696 {
 697         clear_page(page);
 698
 699         if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
 700                 return;
 701         /*
 702          * We shouldnt have to do this, but some versions of glibc
 703          * require it (ld.so assumes zero filled pages are icache clean)
 704          * - Anton
 705          */
 706
 707         /* avoid an atomic op if possible */
 708         if (test_bit(PG_arch_1, &pg->flags))
 709                 clear_bit(PG_arch_1, &pg->flags);
 710 }
 711 EXPORT_SYMBOL(clear_user_page);
 712
 713 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 714                     struct page *pg)
 715 {
 716         copy_page(vto, vfrom);
 717
 718         /*
 719          * We should be able to use the following optimisation, however
 720          * there are two problems.
 721          * Firstly a bug in some versions of binutils meant PLT sections
 722          * were not marked executable.
 723          * Secondly the first word in the GOT section is blrl, used
 724          * to establish the GOT address. Until recently the GOT was
 725          * not marked executable.
 726          * - Anton
 727          */
 728 #if 0
 729         if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
 730                 return;
 731 #endif
 732
 733         if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
 734                 return;
 735
 736         /* avoid an atomic op if possible */
 737         if (test_bit(PG_arch_1, &pg->flags))
 738                 clear_bit(PG_arch_1, &pg->flags);
 739 }
 740
 741 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
 742                              unsigned long addr, int len)
 743 {
 744         unsigned long maddr;
 745
 746         maddr = (unsigned long)page_address(page) + (addr & ~PAGE_MASK);
 747         flush_icache_range(maddr, maddr + len);
 748 }
 749 EXPORT_SYMBOL(flush_icache_user_range);
 750
 751 /*
 752  * This is called at the end of handling a user page fault, when the
 753  * fault has been handled by updating a PTE in the linux page tables.
 754  * We use it to preload an HPTE into the hash table corresponding to
 755  * the updated linux PTE.
 756  *
 757  * This must always be called with the mm->page_table_lock held
 758  */
 759 void update_mmu_cache(struct vm_area_struct *vma, unsigned long ea,
 760                       pte_t pte)
 761 {
 762         unsigned long vsid;
 763         void *pgdir;
 764         pte_t *ptep;
 765         int local = 0;
 766         cpumask_t tmp;
 767         unsigned long flags;
 768
 769         /* handle i-cache coherency */
 770         if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) &&
 771             !cpu_has_feature(CPU_FTR_NOEXECUTE)) {
 772                 unsigned long pfn = pte_pfn(pte);
 773                 if (pfn_valid(pfn)) {
 774                         struct page *page = pfn_to_page(pfn);
 775                         if (!PageReserved(page)
 776                             && !test_bit(PG_arch_1, &page->flags)) {
 777                                 __flush_dcache_icache(page_address(page));
 778                                 set_bit(PG_arch_1, &page->flags);
 779                         }
 780                 }
 781         }
 782
 783         /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
 784         if (!pte_young(pte))
 785                 return;
 786
 787         pgdir = vma->vm_mm->pgd;
 788         if (pgdir == NULL)
 789                 return;
 790
 791         ptep = find_linux_pte(pgdir, ea);
 792         if (!ptep)
 793                 return;
 794
 795         vsid = get_vsid(vma->vm_mm->context.id, ea);
 796
 797         local_irq_save(flags);
 798         tmp = cpumask_of_cpu(smp_processor_id());
 799         if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
 800                 local = 1;
 801
 802         __hash_page(ea, pte_val(pte) & (_PAGE_USER|_PAGE_RW), vsid, ptep,
 803                     0x300, local);
 804         local_irq_restore(flags);
 805 }
 806
 807 void __iomem * reserve_phb_iospace(unsigned long size)
 808 {
 809         void __iomem *virt_addr;
 810
 811         if (phbs_io_bot >= IMALLOC_BASE)
 812                 panic("reserve_phb_iospace(): phb io space overflow\n");
 813
 814         virt_addr = (void __iomem *) phbs_io_bot;
 815         phbs_io_bot += size;
 816
 817         return virt_addr;
 818 }
 819
 820 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
 821 {
 822         memset(addr, 0, kmem_cache_size(cache));
 823 }
 824
 825 static const int pgtable_cache_size[2] = {
 826         PTE_TABLE_SIZE, PMD_TABLE_SIZE
 827 };
 828 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 829         "pgd_pte_cache", "pud_pmd_cache",
 830 };
 831
 832 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
 833
 834 void pgtable_cache_init(void)
 835 {
 836         int i;
 837
 838         BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]);
 839         BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]);
 840         BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]);
 841         BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]);
 842
 843         for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
 844                 int size = pgtable_cache_size[i];
 845                 const char *name = pgtable_cache_name[i];
 846
 847                 pgtable_cache[i] = kmem_cache_create(name,
 848                                                      size, size,
 849                                                      SLAB_HWCACHE_ALIGN
 850                                                      | SLAB_MUST_HWCACHE_ALIGN,
 851                                                      zero_ctor,
 852                                                      NULL);
 853                 if (! pgtable_cache[i])
 854                         panic("pgtable_cache_init(): could not create %s!\n",
 855                               name);
 856         }
 857 }
 858
 859 pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
 860                               unsigned long size, pgprot_t vma_prot)
 861 {
 862         if (ppc_md.phys_mem_access_prot)
 863                 return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot);
 864
 865         if (!page_is_ram(addr >> PAGE_SHIFT))
 866                 vma_prot = __pgprot(pgprot_val(vma_prot)
 867                                     | _PAGE_GUARDED | _PAGE_NO_CACHE);
 868         return vma_prot;
 869 }
 870 EXPORT_SYMBOL(phys_mem_access_prot);