arch/sparc/mm/init_64.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  arch/sparc64/mm/init.c
   4  *
   5  *  Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu)
   6  *  Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/extable.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/string.h>
  13 #include <linux/init.h>
  14 #include <linux/memblock.h>
  15 #include <linux/mm.h>
  16 #include <linux/hugetlb.h>
  17 #include <linux/initrd.h>
  18 #include <linux/swap.h>
  19 #include <linux/pagemap.h>
  20 #include <linux/poison.h>
  21 #include <linux/fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/kprobes.h>
  24 #include <linux/cache.h>
  25 #include <linux/sort.h>
  26 #include <linux/ioport.h>
  27 #include <linux/percpu.h>
  28 #include <linux/mmzone.h>
  29 #include <linux/gfp.h>
  30
  31 #include <asm/head.h>
  32 #include <asm/page.h>
  33 #include <asm/pgalloc.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/oplib.h>
  36 #include <asm/iommu.h>
  37 #include <asm/io.h>
  38 #include <linux/uaccess.h>
  39 #include <asm/mmu_context.h>
  40 #include <asm/tlbflush.h>
  41 #include <asm/dma.h>
  42 #include <asm/starfire.h>
  43 #include <asm/tlb.h>
  44 #include <asm/spitfire.h>
  45 #include <asm/sections.h>
  46 #include <asm/tsb.h>
  47 #include <asm/hypervisor.h>
  48 #include <asm/prom.h>
  49 #include <asm/mdesc.h>
  50 #include <asm/cpudata.h>
  51 #include <asm/setup.h>
  52 #include <asm/irq.h>
  53
  54 #include "init_64.h"
  55
  56 unsigned long kern_linear_pte_xor[4] __read_mostly;
  57 static unsigned long page_cache4v_flag;
  58
  59 /* A bitmap, two bits for every 256MB of physical memory.  These two
  60  * bits determine what page size we use for kernel linear
  61  * translations.  They form an index into kern_linear_pte_xor[].  The
  62  * value in the indexed slot is XOR'd with the TLB miss virtual
  63  * address to form the resulting TTE.  The mapping is:
  64  *
  65  *      0       ==>     4MB
  66  *      1       ==>     256MB
  67  *      2       ==>     2GB
  68  *      3       ==>     16GB
  69  *
  70  * All sun4v chips support 256MB pages.  Only SPARC-T4 and later
  71  * support 2GB pages, and hopefully future cpus will support the 16GB
  72  * pages as well.  For slots 2 and 3, we encode a 256MB TTE xor there
  73  * if these larger page sizes are not supported by the cpu.
  74  *
  75  * It would be nice to determine this from the machine description
  76  * 'cpu' properties, but we need to have this table setup before the
  77  * MDESC is initialized.
  78  */
  79
  80 #ifndef CONFIG_DEBUG_PAGEALLOC
  81 /* A special kernel TSB for 4MB, 256MB, 2GB and 16GB linear mappings.
  82  * Space is allocated for this right after the trap table in
  83  * arch/sparc64/kernel/head.S
  84  */
  85 extern struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
  86 #endif
  87 extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
  88
  89 static unsigned long cpu_pgsz_mask;
  90
  91 #define MAX_BANKS       1024
  92
  93 static struct linux_prom64_registers pavail[MAX_BANKS];
  94 static int pavail_ents;
  95
  96 u64 numa_latency[MAX_NUMNODES][MAX_NUMNODES];
  97
  98 static int cmp_p64(const void *a, const void *b)
  99 {
 100         const struct linux_prom64_registers *x = a, *y = b;
 101
 102         if (x->phys_addr > y->phys_addr)
 103                 return 1;
 104         if (x->phys_addr < y->phys_addr)
 105                 return -1;
 106         return 0;
 107 }
 108
 109 static void __init read_obp_memory(const char *property,
 110                                    struct linux_prom64_registers *regs,
 111                                    int *num_ents)
 112 {
 113         phandle node = prom_finddevice("/memory");
 114         int prop_size = prom_getproplen(node, property);
 115         int ents, ret, i;
 116
 117         ents = prop_size / sizeof(struct linux_prom64_registers);
 118         if (ents > MAX_BANKS) {
 119                 prom_printf("The machine has more %s property entries than "
 120                             "this kernel can support (%d).\n",
 121                             property, MAX_BANKS);
 122                 prom_halt();
 123         }
 124
 125         ret = prom_getproperty(node, property, (char *) regs, prop_size);
 126         if (ret == -1) {
 127                 prom_printf("Couldn't get %s property from /memory.\n",
 128                                 property);
 129                 prom_halt();
 130         }
 131
 132         /* Sanitize what we got from the firmware, by page aligning
 133          * everything.
 134          */
 135         for (i = 0; i < ents; i++) {
 136                 unsigned long base, size;
 137
 138                 base = regs[i].phys_addr;
 139                 size = regs[i].reg_size;
 140
 141                 size &= PAGE_MASK;
 142                 if (base & ~PAGE_MASK) {
 143                         unsigned long new_base = PAGE_ALIGN(base);
 144
 145                         size -= new_base - base;
 146                         if ((long) size < 0L)
 147                                 size = 0UL;
 148                         base = new_base;
 149                 }
 150                 if (size == 0UL) {
 151                         /* If it is empty, simply get rid of it.
 152                          * This simplifies the logic of the other
 153                          * functions that process these arrays.
 154                          */
 155                         memmove(&regs[i], &regs[i + 1],
 156                                 (ents - i - 1) * sizeof(regs[0]));
 157                         i--;
 158                         ents--;
 159                         continue;
 160                 }
 161                 regs[i].phys_addr = base;
 162                 regs[i].reg_size = size;
 163         }
 164
 165         *num_ents = ents;
 166
 167         sort(regs, ents, sizeof(struct linux_prom64_registers),
 168              cmp_p64, NULL);
 169 }
 170
 171 /* Kernel physical address base and size in bytes.  */
 172 unsigned long kern_base __read_mostly;
 173 unsigned long kern_size __read_mostly;
 174
 175 /* Initial ramdisk setup */
 176 extern unsigned long sparc_ramdisk_image64;
 177 extern unsigned int sparc_ramdisk_image;
 178 extern unsigned int sparc_ramdisk_size;
 179
 180 struct page *mem_map_zero __read_mostly;
 181 EXPORT_SYMBOL(mem_map_zero);
 182
 183 unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly;
 184
 185 unsigned long sparc64_kern_pri_context __read_mostly;
 186 unsigned long sparc64_kern_pri_nuc_bits __read_mostly;
 187 unsigned long sparc64_kern_sec_context __read_mostly;
 188
 189 int num_kernel_image_mappings;
 190
 191 #ifdef CONFIG_DEBUG_DCFLUSH
 192 atomic_t dcpage_flushes = ATOMIC_INIT(0);
 193 #ifdef CONFIG_SMP
 194 atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
 195 #endif
 196 #endif
 197
 198 inline void flush_dcache_page_impl(struct page *page)
 199 {
 200         BUG_ON(tlb_type == hypervisor);
 201 #ifdef CONFIG_DEBUG_DCFLUSH
 202         atomic_inc(&dcpage_flushes);
 203 #endif
 204
 205 #ifdef DCACHE_ALIASING_POSSIBLE
 206         __flush_dcache_page(page_address(page),
 207                             ((tlb_type == spitfire) &&
 208                              page_mapping_file(page) != NULL));
 209 #else
 210         if (page_mapping_file(page) != NULL &&
 211             tlb_type == spitfire)
 212                 __flush_icache_page(__pa(page_address(page)));
 213 #endif
 214 }
 215
 216 #define PG_dcache_dirty         PG_arch_1
 217 #define PG_dcache_cpu_shift     32UL
 218 #define PG_dcache_cpu_mask      \
 219         ((1UL<<ilog2(roundup_pow_of_two(NR_CPUS)))-1UL)
 220
 221 #define dcache_dirty_cpu(page) \
 222         (((page)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
 223
 224 static inline void set_dcache_dirty(struct page *page, int this_cpu)
 225 {
 226         unsigned long mask = this_cpu;
 227         unsigned long non_cpu_bits;
 228
 229         non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift);
 230         mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty);
 231
 232         __asm__ __volatile__("1:\n\t"
 233                              "ldx       [%2], %%g7\n\t"
 234                              "and       %%g7, %1, %%g1\n\t"
 235                              "or        %%g1, %0, %%g1\n\t"
 236                              "casx      [%2], %%g7, %%g1\n\t"
 237                              "cmp       %%g7, %%g1\n\t"
 238                              "bne,pn    %%xcc, 1b\n\t"
 239                              " nop"
 240                              : /* no outputs */
 241                              : "r" (mask), "r" (non_cpu_bits), "r" (&page->flags)
 242                              : "g1", "g7");
 243 }
 244
 245 static inline void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
 246 {
 247         unsigned long mask = (1UL << PG_dcache_dirty);
 248
 249         __asm__ __volatile__("! test_and_clear_dcache_dirty\n"
 250                              "1:\n\t"
 251                              "ldx       [%2], %%g7\n\t"
 252                              "srlx      %%g7, %4, %%g1\n\t"
 253                              "and       %%g1, %3, %%g1\n\t"
 254                              "cmp       %%g1, %0\n\t"
 255                              "bne,pn    %%icc, 2f\n\t"
 256                              " andn     %%g7, %1, %%g1\n\t"
 257                              "casx      [%2], %%g7, %%g1\n\t"
 258                              "cmp       %%g7, %%g1\n\t"
 259                              "bne,pn    %%xcc, 1b\n\t"
 260                              " nop\n"
 261                              "2:"
 262                              : /* no outputs */
 263                              : "r" (cpu), "r" (mask), "r" (&page->flags),
 264                                "i" (PG_dcache_cpu_mask),
 265                                "i" (PG_dcache_cpu_shift)
 266                              : "g1", "g7");
 267 }
 268
 269 static inline void tsb_insert(struct tsb *ent, unsigned long tag, unsigned long pte)
 270 {
 271         unsigned long tsb_addr = (unsigned long) ent;
 272
 273         if (tlb_type == cheetah_plus || tlb_type == hypervisor)
 274                 tsb_addr = __pa(tsb_addr);
 275
 276         __tsb_insert(tsb_addr, tag, pte);
 277 }
 278
 279 unsigned long _PAGE_ALL_SZ_BITS __read_mostly;
 280
 281 static void flush_dcache(unsigned long pfn)
 282 {
 283         struct page *page;
 284
 285         page = pfn_to_page(pfn);
 286         if (page) {
 287                 unsigned long pg_flags;
 288
 289                 pg_flags = page->flags;
 290                 if (pg_flags & (1UL << PG_dcache_dirty)) {
 291                         int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
 292                                    PG_dcache_cpu_mask);
 293                         int this_cpu = get_cpu();
 294
 295                         /* This is just to optimize away some function calls
 296                          * in the SMP case.
 297                          */
 298                         if (cpu == this_cpu)
 299                                 flush_dcache_page_impl(page);
 300                         else
 301                                 smp_flush_dcache_page_impl(page, cpu);
 302
 303                         clear_dcache_dirty_cpu(page, cpu);
 304
 305                         put_cpu();
 306                 }
 307         }
 308 }
 309
 310 /* mm->context.lock must be held */
 311 static void __update_mmu_tsb_insert(struct mm_struct *mm, unsigned long tsb_index,
 312                                     unsigned long tsb_hash_shift, unsigned long address,
 313                                     unsigned long tte)
 314 {
 315         struct tsb *tsb = mm->context.tsb_block[tsb_index].tsb;
 316         unsigned long tag;
 317
 318         if (unlikely(!tsb))
 319                 return;
 320
 321         tsb += ((address >> tsb_hash_shift) &
 322                 (mm->context.tsb_block[tsb_index].tsb_nentries - 1UL));
 323         tag = (address >> 22UL);
 324         tsb_insert(tsb, tag, tte);
 325 }
 326
 327 #ifdef CONFIG_HUGETLB_PAGE
 328 static void __init add_huge_page_size(unsigned long size)
 329 {
 330         unsigned int order;
 331
 332         if (size_to_hstate(size))
 333                 return;
 334
 335         order = ilog2(size) - PAGE_SHIFT;
 336         hugetlb_add_hstate(order);
 337 }
 338
 339 static int __init hugetlbpage_init(void)
 340 {
 341         add_huge_page_size(1UL << HPAGE_64K_SHIFT);
 342         add_huge_page_size(1UL << HPAGE_SHIFT);
 343         add_huge_page_size(1UL << HPAGE_256MB_SHIFT);
 344         add_huge_page_size(1UL << HPAGE_2GB_SHIFT);
 345
 346         return 0;
 347 }
 348
 349 arch_initcall(hugetlbpage_init);
 350
 351 static void __init pud_huge_patch(void)
 352 {
 353         struct pud_huge_patch_entry *p;
 354         unsigned long addr;
 355
 356         p = &__pud_huge_patch;
 357         addr = p->addr;
 358         *(unsigned int *)addr = p->insn;
 359
 360         __asm__ __volatile__("flush %0" : : "r" (addr));
 361 }
 362
 363 static int __init setup_hugepagesz(char *string)
 364 {
 365         unsigned long long hugepage_size;
 366         unsigned int hugepage_shift;
 367         unsigned short hv_pgsz_idx;
 368         unsigned int hv_pgsz_mask;
 369         int rc = 0;
 370
 371         hugepage_size = memparse(string, &string);
 372         hugepage_shift = ilog2(hugepage_size);
 373
 374         switch (hugepage_shift) {
 375         case HPAGE_16GB_SHIFT:
 376                 hv_pgsz_mask = HV_PGSZ_MASK_16GB;
 377                 hv_pgsz_idx = HV_PGSZ_IDX_16GB;
 378                 pud_huge_patch();
 379                 break;
 380         case HPAGE_2GB_SHIFT:
 381                 hv_pgsz_mask = HV_PGSZ_MASK_2GB;
 382                 hv_pgsz_idx = HV_PGSZ_IDX_2GB;
 383                 break;
 384         case HPAGE_256MB_SHIFT:
 385                 hv_pgsz_mask = HV_PGSZ_MASK_256MB;
 386                 hv_pgsz_idx = HV_PGSZ_IDX_256MB;
 387                 break;
 388         case HPAGE_SHIFT:
 389                 hv_pgsz_mask = HV_PGSZ_MASK_4MB;
 390                 hv_pgsz_idx = HV_PGSZ_IDX_4MB;
 391                 break;
 392         case HPAGE_64K_SHIFT:
 393                 hv_pgsz_mask = HV_PGSZ_MASK_64K;
 394                 hv_pgsz_idx = HV_PGSZ_IDX_64K;
 395                 break;
 396         default:
 397                 hv_pgsz_mask = 0;
 398         }
 399
 400         if ((hv_pgsz_mask & cpu_pgsz_mask) == 0U) {
 401                 hugetlb_bad_size();
 402                 pr_err("hugepagesz=%llu not supported by MMU.\n",
 403                         hugepage_size);
 404                 goto out;
 405         }
 406
 407         add_huge_page_size(hugepage_size);
 408         rc = 1;
 409
 410 out:
 411         return rc;
 412 }
 413 __setup("hugepagesz=", setup_hugepagesz);
 414 #endif  /* CONFIG_HUGETLB_PAGE */
 415
 416 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
 417 {
 418         struct mm_struct *mm;
 419         unsigned long flags;
 420         bool is_huge_tsb;
 421         pte_t pte = *ptep;
 422
 423         if (tlb_type != hypervisor) {
 424                 unsigned long pfn = pte_pfn(pte);
 425
 426                 if (pfn_valid(pfn))
 427                         flush_dcache(pfn);
 428         }
 429
 430         mm = vma->vm_mm;
 431
 432         /* Don't insert a non-valid PTE into the TSB, we'll deadlock.  */
 433         if (!pte_accessible(mm, pte))
 434                 return;
 435
 436         spin_lock_irqsave(&mm->context.lock, flags);
 437
 438         is_huge_tsb = false;
 439 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
 440         if (mm->context.hugetlb_pte_count || mm->context.thp_pte_count) {
 441                 unsigned long hugepage_size = PAGE_SIZE;
 442
 443                 if (is_vm_hugetlb_page(vma))
 444                         hugepage_size = huge_page_size(hstate_vma(vma));
 445
 446                 if (hugepage_size >= PUD_SIZE) {
 447                         unsigned long mask = 0x1ffc00000UL;
 448
 449                         /* Transfer bits [32:22] from address to resolve
 450                          * at 4M granularity.
 451                          */
 452                         pte_val(pte) &= ~mask;
 453                         pte_val(pte) |= (address & mask);
 454                 } else if (hugepage_size >= PMD_SIZE) {
 455                         /* We are fabricating 8MB pages using 4MB
 456                          * real hw pages.
 457                          */
 458                         pte_val(pte) |= (address & (1UL << REAL_HPAGE_SHIFT));
 459                 }
 460
 461                 if (hugepage_size >= PMD_SIZE) {
 462                         __update_mmu_tsb_insert(mm, MM_TSB_HUGE,
 463                                 REAL_HPAGE_SHIFT, address, pte_val(pte));
 464                         is_huge_tsb = true;
 465                 }
 466         }
 467 #endif
 468         if (!is_huge_tsb)
 469                 __update_mmu_tsb_insert(mm, MM_TSB_BASE, PAGE_SHIFT,
 470                                         address, pte_val(pte));
 471
 472         spin_unlock_irqrestore(&mm->context.lock, flags);
 473 }
 474
 475 void flush_dcache_page(struct page *page)
 476 {
 477         struct address_space *mapping;
 478         int this_cpu;
 479
 480         if (tlb_type == hypervisor)
 481                 return;
 482
 483         /* Do not bother with the expensive D-cache flush if it
 484          * is merely the zero page.  The 'bigcore' testcase in GDB
 485          * causes this case to run millions of times.
 486          */
 487         if (page == ZERO_PAGE(0))
 488                 return;
 489
 490         this_cpu = get_cpu();
 491
 492         mapping = page_mapping_file(page);
 493         if (mapping && !mapping_mapped(mapping)) {
 494                 int dirty = test_bit(PG_dcache_dirty, &page->flags);
 495                 if (dirty) {
 496                         int dirty_cpu = dcache_dirty_cpu(page);
 497
 498                         if (dirty_cpu == this_cpu)
 499                                 goto out;
 500                         smp_flush_dcache_page_impl(page, dirty_cpu);
 501                 }
 502                 set_dcache_dirty(page, this_cpu);
 503         } else {
 504                 /* We could delay the flush for the !page_mapping
 505                  * case too.  But that case is for exec env/arg
 506                  * pages and those are %99 certainly going to get
 507                  * faulted into the tlb (and thus flushed) anyways.
 508                  */
 509                 flush_dcache_page_impl(page);
 510         }
 511
 512 out:
 513         put_cpu();
 514 }
 515 EXPORT_SYMBOL(flush_dcache_page);
 516
 517 void __kprobes flush_icache_range(unsigned long start, unsigned long end)
 518 {
 519         /* Cheetah and Hypervisor platform cpus have coherent I-cache. */
 520         if (tlb_type == spitfire) {
 521                 unsigned long kaddr;
 522
 523                 /* This code only runs on Spitfire cpus so this is
 524                  * why we can assume _PAGE_PADDR_4U.
 525                  */
 526                 for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE) {
 527                         unsigned long paddr, mask = _PAGE_PADDR_4U;
 528
 529                         if (kaddr >= PAGE_OFFSET)
 530                                 paddr = kaddr & mask;
 531                         else {
 532                                 pgd_t *pgdp = pgd_offset_k(kaddr);
 533                                 p4d_t *p4dp = p4d_offset(pgdp, kaddr);
 534                                 pud_t *pudp = pud_offset(p4dp, kaddr);
 535                                 pmd_t *pmdp = pmd_offset(pudp, kaddr);
 536                                 pte_t *ptep = pte_offset_kernel(pmdp, kaddr);
 537
 538                                 paddr = pte_val(*ptep) & mask;
 539                         }
 540                         __flush_icache_page(paddr);
 541                 }
 542         }
 543 }
 544 EXPORT_SYMBOL(flush_icache_range);
 545
 546 void mmu_info(struct seq_file *m)
 547 {
 548         static const char *pgsz_strings[] = {
 549                 "8K", "64K", "512K", "4MB", "32MB",
 550                 "256MB", "2GB", "16GB",
 551         };
 552         int i, printed;
 553
 554         if (tlb_type == cheetah)
 555                 seq_printf(m, "MMU Type\t: Cheetah\n");
 556         else if (tlb_type == cheetah_plus)
 557                 seq_printf(m, "MMU Type\t: Cheetah+\n");
 558         else if (tlb_type == spitfire)
 559                 seq_printf(m, "MMU Type\t: Spitfire\n");
 560         else if (tlb_type == hypervisor)
 561                 seq_printf(m, "MMU Type\t: Hypervisor (sun4v)\n");
 562         else
 563                 seq_printf(m, "MMU Type\t: ???\n");
 564
 565         seq_printf(m, "MMU PGSZs\t: ");
 566         printed = 0;
 567         for (i = 0; i < ARRAY_SIZE(pgsz_strings); i++) {
 568                 if (cpu_pgsz_mask & (1UL << i)) {
 569                         seq_printf(m, "%s%s",
 570                                    printed ? "," : "", pgsz_strings[i]);
 571                         printed++;
 572                 }
 573         }
 574         seq_putc(m, '\n');
 575
 576 #ifdef CONFIG_DEBUG_DCFLUSH
 577         seq_printf(m, "DCPageFlushes\t: %d\n",
 578                    atomic_read(&dcpage_flushes));
 579 #ifdef CONFIG_SMP
 580         seq_printf(m, "DCPageFlushesXC\t: %d\n",
 581                    atomic_read(&dcpage_flushes_xcall));
 582 #endif /* CONFIG_SMP */
 583 #endif /* CONFIG_DEBUG_DCFLUSH */
 584 }
 585
 586 struct linux_prom_translation prom_trans[512] __read_mostly;
 587 unsigned int prom_trans_ents __read_mostly;
 588
 589 unsigned long kern_locked_tte_data;
 590
 591 /* The obp translations are saved based on 8k pagesize, since obp can
 592  * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
 593  * HI_OBP_ADDRESS range are handled in ktlb.S.
 594  */
 595 static inline int in_obp_range(unsigned long vaddr)
 596 {
 597         return (vaddr >= LOW_OBP_ADDRESS &&
 598                 vaddr < HI_OBP_ADDRESS);
 599 }
 600
 601 static int cmp_ptrans(const void *a, const void *b)
 602 {
 603         const struct linux_prom_translation *x = a, *y = b;
 604
 605         if (x->virt > y->virt)
 606                 return 1;
 607         if (x->virt < y->virt)
 608                 return -1;
 609         return 0;
 610 }
 611
 612 /* Read OBP translations property into 'prom_trans[]'.  */
 613 static void __init read_obp_translations(void)
 614 {
 615         int n, node, ents, first, last, i;
 616
 617         node = prom_finddevice("/virtual-memory");
 618         n = prom_getproplen(node, "translations");
 619         if (unlikely(n == 0 || n == -1)) {
 620                 prom_printf("prom_mappings: Couldn't get size.\n");
 621                 prom_halt();
 622         }
 623         if (unlikely(n > sizeof(prom_trans))) {
 624                 prom_printf("prom_mappings: Size %d is too big.\n", n);
 625                 prom_halt();
 626         }
 627
 628         if ((n = prom_getproperty(node, "translations",
 629                                   (char *)&prom_trans[0],
 630                                   sizeof(prom_trans))) == -1) {
 631                 prom_printf("prom_mappings: Couldn't get property.\n");
 632                 prom_halt();
 633         }
 634
 635         n = n / sizeof(struct linux_prom_translation);
 636
 637         ents = n;
 638
 639         sort(prom_trans, ents, sizeof(struct linux_prom_translation),
 640              cmp_ptrans, NULL);
 641
 642         /* Now kick out all the non-OBP entries.  */
 643         for (i = 0; i < ents; i++) {
 644                 if (in_obp_range(prom_trans[i].virt))
 645                         break;
 646         }
 647         first = i;
 648         for (; i < ents; i++) {
 649                 if (!in_obp_range(prom_trans[i].virt))
 650                         break;
 651         }
 652         last = i;
 653
 654         for (i = 0; i < (last - first); i++) {
 655                 struct linux_prom_translation *src = &prom_trans[i + first];
 656                 struct linux_prom_translation *dest = &prom_trans[i];
 657
 658                 *dest = *src;
 659         }
 660         for (; i < ents; i++) {
 661                 struct linux_prom_translation *dest = &prom_trans[i];
 662                 dest->virt = dest->size = dest->data = 0x0UL;
 663         }
 664
 665         prom_trans_ents = last - first;
 666
 667         if (tlb_type == spitfire) {
 668                 /* Clear diag TTE bits. */
 669                 for (i = 0; i < prom_trans_ents; i++)
 670                         prom_trans[i].data &= ~0x0003fe0000000000UL;
 671         }
 672
 673         /* Force execute bit on.  */
 674         for (i = 0; i < prom_trans_ents; i++)
 675                 prom_trans[i].data |= (tlb_type == hypervisor ?
 676                                        _PAGE_EXEC_4V : _PAGE_EXEC_4U);
 677 }
 678
 679 static void __init hypervisor_tlb_lock(unsigned long vaddr,
 680                                        unsigned long pte,
 681                                        unsigned long mmu)
 682 {
 683         unsigned long ret = sun4v_mmu_map_perm_addr(vaddr, 0, pte, mmu);
 684
 685         if (ret != 0) {
 686                 prom_printf("hypervisor_tlb_lock[%lx:%x:%lx:%lx]: "
 687                             "errors with %lx\n", vaddr, 0, pte, mmu, ret);
 688                 prom_halt();
 689         }
 690 }
 691
 692 static unsigned long kern_large_tte(unsigned long paddr);
 693
 694 static void __init remap_kernel(void)
 695 {
 696         unsigned long phys_page, tte_vaddr, tte_data;
 697         int i, tlb_ent = sparc64_highest_locked_tlbent();
 698
 699         tte_vaddr = (unsigned long) KERNBASE;
 700         phys_page = (prom_boot_mapping_phys_low >> ILOG2_4MB) << ILOG2_4MB;
 701         tte_data = kern_large_tte(phys_page);
 702
 703         kern_locked_tte_data = tte_data;
 704
 705         /* Now lock us into the TLBs via Hypervisor or OBP. */
 706         if (tlb_type == hypervisor) {
 707                 for (i = 0; i < num_kernel_image_mappings; i++) {
 708                         hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_DMMU);
 709                         hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_IMMU);
 710                         tte_vaddr += 0x400000;
 711                         tte_data += 0x400000;
 712                 }
 713         } else {
 714                 for (i = 0; i < num_kernel_image_mappings; i++) {
 715                         prom_dtlb_load(tlb_ent - i, tte_data, tte_vaddr);
 716                         prom_itlb_load(tlb_ent - i, tte_data, tte_vaddr);
 717                         tte_vaddr += 0x400000;
 718                         tte_data += 0x400000;
 719                 }
 720                 sparc64_highest_unlocked_tlb_ent = tlb_ent - i;
 721         }
 722         if (tlb_type == cheetah_plus) {
 723                 sparc64_kern_pri_context = (CTX_CHEETAH_PLUS_CTX0 |
 724                                             CTX_CHEETAH_PLUS_NUC);
 725                 sparc64_kern_pri_nuc_bits = CTX_CHEETAH_PLUS_NUC;
 726                 sparc64_kern_sec_context = CTX_CHEETAH_PLUS_CTX0;
 727         }
 728 }
 729
 730
 731 static void __init inherit_prom_mappings(void)
 732 {
 733         /* Now fixup OBP's idea about where we really are mapped. */
 734         printk("Remapping the kernel... ");
 735         remap_kernel();
 736         printk("done.\n");
 737 }
 738
 739 void prom_world(int enter)
 740 {
 741         if (!enter)
 742                 set_fs(get_fs());
 743
 744         __asm__ __volatile__("flushw");
 745 }
 746
 747 void __flush_dcache_range(unsigned long start, unsigned long end)
 748 {
 749         unsigned long va;
 750
 751         if (tlb_type == spitfire) {
 752                 int n = 0;
 753
 754                 for (va = start; va < end; va += 32) {
 755                         spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
 756                         if (++n >= 512)
 757                                 break;
 758                 }
 759         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 760                 start = __pa(start);
 761                 end = __pa(end);
 762                 for (va = start; va < end; va += 32)
 763                         __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
 764                                              "membar #Sync"
 765                                              : /* no outputs */
 766                                              : "r" (va),
 767                                                "i" (ASI_DCACHE_INVALIDATE));
 768         }
 769 }
 770 EXPORT_SYMBOL(__flush_dcache_range);
 771
 772 /* get_new_mmu_context() uses "cache + 1".  */
 773 DEFINE_SPINLOCK(ctx_alloc_lock);
 774 unsigned long tlb_context_cache = CTX_FIRST_VERSION;
 775 #define MAX_CTX_NR      (1UL << CTX_NR_BITS)
 776 #define CTX_BMAP_SLOTS  BITS_TO_LONGS(MAX_CTX_NR)
 777 DECLARE_BITMAP(mmu_context_bmap, MAX_CTX_NR);
 778 DEFINE_PER_CPU(struct mm_struct *, per_cpu_secondary_mm) = {0};
 779
 780 static void mmu_context_wrap(void)
 781 {
 782         unsigned long old_ver = tlb_context_cache & CTX_VERSION_MASK;
 783         unsigned long new_ver, new_ctx, old_ctx;
 784         struct mm_struct *mm;
 785         int cpu;
 786
 787         bitmap_zero(mmu_context_bmap, 1 << CTX_NR_BITS);
 788
 789         /* Reserve kernel context */
 790         set_bit(0, mmu_context_bmap);
 791
 792         new_ver = (tlb_context_cache & CTX_VERSION_MASK) + CTX_FIRST_VERSION;
 793         if (unlikely(new_ver == 0))
 794                 new_ver = CTX_FIRST_VERSION;
 795         tlb_context_cache = new_ver;
 796
 797         /*
 798          * Make sure that any new mm that are added into per_cpu_secondary_mm,
 799          * are going to go through get_new_mmu_context() path.
 800          */
 801         mb();
 802
 803         /*
 804          * Updated versions to current on those CPUs that had valid secondary
 805          * contexts
 806          */
 807         for_each_online_cpu(cpu) {
 808                 /*
 809                  * If a new mm is stored after we took this mm from the array,
 810                  * it will go into get_new_mmu_context() path, because we
 811                  * already bumped the version in tlb_context_cache.
 812                  */
 813                 mm = per_cpu(per_cpu_secondary_mm, cpu);
 814
 815                 if (unlikely(!mm || mm == &init_mm))
 816                         continue;
 817
 818                 old_ctx = mm->context.sparc64_ctx_val;
 819                 if (likely((old_ctx & CTX_VERSION_MASK) == old_ver)) {
 820                         new_ctx = (old_ctx & ~CTX_VERSION_MASK) | new_ver;
 821                         set_bit(new_ctx & CTX_NR_MASK, mmu_context_bmap);
 822                         mm->context.sparc64_ctx_val = new_ctx;
 823                 }
 824         }
 825 }
 826
 827 /* Caller does TLB context flushing on local CPU if necessary.
 828  * The caller also ensures that CTX_VALID(mm->context) is false.
 829  *
 830  * We must be careful about boundary cases so that we never
 831  * let the user have CTX 0 (nucleus) or we ever use a CTX
 832  * version of zero (and thus NO_CONTEXT would not be caught
 833  * by version mis-match tests in mmu_context.h).
 834  *
 835  * Always invoked with interrupts disabled.
 836  */
 837 void get_new_mmu_context(struct mm_struct *mm)
 838 {
 839         unsigned long ctx, new_ctx;
 840         unsigned long orig_pgsz_bits;
 841
 842         spin_lock(&ctx_alloc_lock);
 843 retry:
 844         /* wrap might have happened, test again if our context became valid */
 845         if (unlikely(CTX_VALID(mm->context)))
 846                 goto out;
 847         orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
 848         ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
 849         new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
 850         if (new_ctx >= (1 << CTX_NR_BITS)) {
 851                 new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1);
 852                 if (new_ctx >= ctx) {
 853                         mmu_context_wrap();
 854                         goto retry;
 855                 }
 856         }
 857         if (mm->context.sparc64_ctx_val)
 858                 cpumask_clear(mm_cpumask(mm));
 859         mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63));
 860         new_ctx |= (tlb_context_cache & CTX_VERSION_MASK);
 861         tlb_context_cache = new_ctx;
 862         mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
 863 out:
 864         spin_unlock(&ctx_alloc_lock);
 865 }
 866
 867 static int numa_enabled = 1;
 868 static int numa_debug;
 869
 870 static int __init early_numa(char *p)
 871 {
 872         if (!p)
 873                 return 0;
 874
 875         if (strstr(p, "off"))
 876                 numa_enabled = 0;
 877
 878         if (strstr(p, "debug"))
 879                 numa_debug = 1;
 880
 881         return 0;
 882 }
 883 early_param("numa", early_numa);
 884
 885 #define numadbg(f, a...) \
 886 do {    if (numa_debug) \
 887                 printk(KERN_INFO f, ## a); \
 888 } while (0)
 889
 890 static void __init find_ramdisk(unsigned long phys_base)
 891 {
 892 #ifdef CONFIG_BLK_DEV_INITRD
 893         if (sparc_ramdisk_image || sparc_ramdisk_image64) {
 894                 unsigned long ramdisk_image;
 895
 896                 /* Older versions of the bootloader only supported a
 897                  * 32-bit physical address for the ramdisk image
 898                  * location, stored at sparc_ramdisk_image.  Newer
 899                  * SILO versions set sparc_ramdisk_image to zero and
 900                  * provide a full 64-bit physical address at
 901                  * sparc_ramdisk_image64.
 902                  */
 903                 ramdisk_image = sparc_ramdisk_image;
 904                 if (!ramdisk_image)
 905                         ramdisk_image = sparc_ramdisk_image64;
 906
 907                 /* Another bootloader quirk.  The bootloader normalizes
 908                  * the physical address to KERNBASE, so we have to
 909                  * factor that back out and add in the lowest valid
 910                  * physical page address to get the true physical address.
 911                  */
 912                 ramdisk_image -= KERNBASE;
 913                 ramdisk_image += phys_base;
 914
 915                 numadbg("Found ramdisk at physical address 0x%lx, size %u\n",
 916                         ramdisk_image, sparc_ramdisk_size);
 917
 918                 initrd_start = ramdisk_image;
 919                 initrd_end = ramdisk_image + sparc_ramdisk_size;
 920
 921                 memblock_reserve(initrd_start, sparc_ramdisk_size);
 922
 923                 initrd_start += PAGE_OFFSET;
 924                 initrd_end += PAGE_OFFSET;
 925         }
 926 #endif
 927 }
 928
 929 struct node_mem_mask {
 930         unsigned long mask;
 931         unsigned long match;
 932 };
 933 static struct node_mem_mask node_masks[MAX_NUMNODES];
 934 static int num_node_masks;
 935
 936 #ifdef CONFIG_NEED_MULTIPLE_NODES
 937
 938 struct mdesc_mlgroup {
 939         u64     node;
 940         u64     latency;
 941         u64     match;
 942         u64     mask;
 943 };
 944
 945 static struct mdesc_mlgroup *mlgroups;
 946 static int num_mlgroups;
 947
 948 int numa_cpu_lookup_table[NR_CPUS];
 949 cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES];
 950
 951 struct mdesc_mblock {
 952         u64     base;
 953         u64     size;
 954         u64     offset; /* RA-to-PA */
 955 };
 956 static struct mdesc_mblock *mblocks;
 957 static int num_mblocks;
 958
 959 static struct mdesc_mblock * __init addr_to_mblock(unsigned long addr)
 960 {
 961         struct mdesc_mblock *m = NULL;
 962         int i;
 963
 964         for (i = 0; i < num_mblocks; i++) {
 965                 m = &mblocks[i];
 966
 967                 if (addr >= m->base &&
 968                     addr < (m->base + m->size)) {
 969                         break;
 970                 }
 971         }
 972
 973         return m;
 974 }
 975
 976 static u64 __init memblock_nid_range_sun4u(u64 start, u64 end, int *nid)
 977 {
 978         int prev_nid, new_nid;
 979
 980         prev_nid = NUMA_NO_NODE;
 981         for ( ; start < end; start += PAGE_SIZE) {
 982                 for (new_nid = 0; new_nid < num_node_masks; new_nid++) {
 983                         struct node_mem_mask *p = &node_masks[new_nid];
 984
 985                         if ((start & p->mask) == p->match) {
 986                                 if (prev_nid == NUMA_NO_NODE)
 987                                         prev_nid = new_nid;
 988                                 break;
 989                         }
 990                 }
 991
 992                 if (new_nid == num_node_masks) {
 993                         prev_nid = 0;
 994                         WARN_ONCE(1, "addr[%Lx] doesn't match a NUMA node rule. Some memory will be owned by node 0.",
 995                                   start);
 996                         break;
 997                 }
 998
 999                 if (prev_nid != new_nid)
1000                         break;
1001         }
1002         *nid = prev_nid;
1003
1004         return start > end ? end : start;
1005 }
1006
1007 static u64 __init memblock_nid_range(u64 start, u64 end, int *nid)
1008 {
1009         u64 ret_end, pa_start, m_mask, m_match, m_end;
1010         struct mdesc_mblock *mblock;
1011         int _nid, i;
1012
1013         if (tlb_type != hypervisor)
1014                 return memblock_nid_range_sun4u(start, end, nid);
1015
1016         mblock = addr_to_mblock(start);
1017         if (!mblock) {
1018                 WARN_ONCE(1, "memblock_nid_range: Can't find mblock addr[%Lx]",
1019                           start);
1020
1021                 _nid = 0;
1022                 ret_end = end;
1023                 goto done;
1024         }
1025
1026         pa_start = start + mblock->offset;
1027         m_match = 0;
1028         m_mask = 0;
1029
1030         for (_nid = 0; _nid < num_node_masks; _nid++) {
1031                 struct node_mem_mask *const m = &node_masks[_nid];
1032
1033                 if ((pa_start & m->mask) == m->match) {
1034                         m_match = m->match;
1035                         m_mask = m->mask;
1036                         break;
1037                 }
1038         }
1039
1040         if (num_node_masks == _nid) {
1041                 /* We could not find NUMA group, so default to 0, but lets
1042                  * search for latency group, so we could calculate the correct
1043                  * end address that we return
1044                  */
1045                 _nid = 0;
1046
1047                 for (i = 0; i < num_mlgroups; i++) {
1048                         struct mdesc_mlgroup *const m = &mlgroups[i];
1049
1050                         if ((pa_start & m->mask) == m->match) {
1051                                 m_match = m->match;
1052                                 m_mask = m->mask;
1053                                 break;
1054                         }
1055                 }
1056
1057                 if (i == num_mlgroups) {
1058                         WARN_ONCE(1, "memblock_nid_range: Can't find latency group addr[%Lx]",
1059                                   start);
1060
1061                         ret_end = end;
1062                         goto done;
1063                 }
1064         }
1065
1066         /*
1067          * Each latency group has match and mask, and each memory block has an
1068          * offset.  An address belongs to a latency group if its address matches
1069          * the following formula: ((addr + offset) & mask) == match
1070          * It is, however, slow to check every single page if it matches a
1071          * particular latency group. As optimization we calculate end value by
1072          * using bit arithmetics.
1073          */
1074         m_end = m_match + (1ul << __ffs(m_mask)) - mblock->offset;
1075         m_end += pa_start & ~((1ul << fls64(m_mask)) - 1);
1076         ret_end = m_end > end ? end : m_end;
1077
1078 done:
1079         *nid = _nid;
1080         return ret_end;
1081 }
1082 #endif
1083
1084 /* This must be invoked after performing all of the necessary
1085  * memblock_set_node() calls for 'nid'.  We need to be able to get
1086  * correct data from get_pfn_range_for_nid().
1087  */
1088 static void __init allocate_node_data(int nid)
1089 {
1090         struct pglist_data *p;
1091         unsigned long start_pfn, end_pfn;
1092 #ifdef CONFIG_NEED_MULTIPLE_NODES
1093
1094         NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data),
1095                                              SMP_CACHE_BYTES, nid);
1096         if (!NODE_DATA(nid)) {
1097                 prom_printf("Cannot allocate pglist_data for nid[%d]\n", nid);
1098                 prom_halt();
1099         }
1100
1101         NODE_DATA(nid)->node_id = nid;
1102 #endif
1103
1104         p = NODE_DATA(nid);
1105
1106         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
1107         p->node_start_pfn = start_pfn;
1108         p->node_spanned_pages = end_pfn - start_pfn;
1109 }
1110
1111 static void init_node_masks_nonnuma(void)
1112 {
1113 #ifdef CONFIG_NEED_MULTIPLE_NODES
1114         int i;
1115 #endif
1116
1117         numadbg("Initializing tables for non-numa.\n");
1118
1119         node_masks[0].mask = 0;
1120         node_masks[0].match = 0;
1121         num_node_masks = 1;
1122
1123 #ifdef CONFIG_NEED_MULTIPLE_NODES
1124         for (i = 0; i < NR_CPUS; i++)
1125                 numa_cpu_lookup_table[i] = 0;
1126
1127         cpumask_setall(&numa_cpumask_lookup_table[0]);
1128 #endif
1129 }
1130
1131 #ifdef CONFIG_NEED_MULTIPLE_NODES
1132 struct pglist_data *node_data[MAX_NUMNODES];
1133
1134 EXPORT_SYMBOL(numa_cpu_lookup_table);
1135 EXPORT_SYMBOL(numa_cpumask_lookup_table);
1136 EXPORT_SYMBOL(node_data);
1137
1138 static int scan_pio_for_cfg_handle(struct mdesc_handle *md, u64 pio,
1139                                    u32 cfg_handle)
1140 {
1141         u64 arc;
1142
1143         mdesc_for_each_arc(arc, md, pio, MDESC_ARC_TYPE_FWD) {
1144                 u64 target = mdesc_arc_target(md, arc);
1145                 const u64 *val;
1146
1147                 val = mdesc_get_property(md, target,
1148                                          "cfg-handle", NULL);
1149                 if (val && *val == cfg_handle)
1150                         return 0;
1151         }
1152         return -ENODEV;
1153 }
1154
1155 static int scan_arcs_for_cfg_handle(struct mdesc_handle *md, u64 grp,
1156                                     u32 cfg_handle)
1157 {
1158         u64 arc, candidate, best_latency = ~(u64)0;
1159
1160         candidate = MDESC_NODE_NULL;
1161         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
1162                 u64 target = mdesc_arc_target(md, arc);
1163                 const char *name = mdesc_node_name(md, target);
1164                 const u64 *val;
1165
1166                 if (strcmp(name, "pio-latency-group"))
1167                         continue;
1168
1169                 val = mdesc_get_property(md, target, "latency", NULL);
1170                 if (!val)
1171                         continue;
1172
1173                 if (*val < best_latency) {
1174                         candidate = target;
1175                         best_latency = *val;
1176                 }
1177         }
1178
1179         if (candidate == MDESC_NODE_NULL)
1180                 return -ENODEV;
1181
1182         return scan_pio_for_cfg_handle(md, candidate, cfg_handle);
1183 }
1184
1185 int of_node_to_nid(struct device_node *dp)
1186 {
1187         const struct linux_prom64_registers *regs;
1188         struct mdesc_handle *md;
1189         u32 cfg_handle;
1190         int count, nid;
1191         u64 grp;
1192
1193         /* This is the right thing to do on currently supported
1194          * SUN4U NUMA platforms as well, as the PCI controller does
1195          * not sit behind any particular memory controller.
1196          */
1197         if (!mlgroups)
1198                 return -1;
1199
1200         regs = of_get_property(dp, "reg", NULL);
1201         if (!regs)
1202                 return -1;
1203
1204         cfg_handle = (regs->phys_addr >> 32UL) & 0x0fffffff;
1205
1206         md = mdesc_grab();
1207
1208         count = 0;
1209         nid = NUMA_NO_NODE;
1210         mdesc_for_each_node_by_name(md, grp, "group") {
1211                 if (!scan_arcs_for_cfg_handle(md, grp, cfg_handle)) {
1212                         nid = count;
1213                         break;
1214                 }
1215                 count++;
1216         }
1217
1218         mdesc_release(md);
1219
1220         return nid;
1221 }
1222
1223 static void __init add_node_ranges(void)
1224 {
1225         struct memblock_region *reg;
1226         unsigned long prev_max;
1227
1228 memblock_resized:
1229         prev_max = memblock.memory.max;
1230
1231         for_each_memblock(memory, reg) {
1232                 unsigned long size = reg->size;
1233                 unsigned long start, end;
1234
1235                 start = reg->base;
1236                 end = start + size;
1237                 while (start < end) {
1238                         unsigned long this_end;
1239                         int nid;
1240
1241                         this_end = memblock_nid_range(start, end, &nid);
1242
1243                         numadbg("Setting memblock NUMA node nid[%d] "
1244                                 "start[%lx] end[%lx]\n",
1245                                 nid, start, this_end);
1246
1247                         memblock_set_node(start, this_end - start,
1248                                           &memblock.memory, nid);
1249                         if (memblock.memory.max != prev_max)
1250                                 goto memblock_resized;
1251                         start = this_end;
1252                 }
1253         }
1254 }
1255
1256 static int __init grab_mlgroups(struct mdesc_handle *md)
1257 {
1258         unsigned long paddr;
1259         int count = 0;
1260         u64 node;
1261
1262         mdesc_for_each_node_by_name(md, node, "memory-latency-group")
1263                 count++;
1264         if (!count)
1265                 return -ENOENT;
1266
1267         paddr = memblock_phys_alloc(count * sizeof(struct mdesc_mlgroup),
1268                                     SMP_CACHE_BYTES);
1269         if (!paddr)
1270                 return -ENOMEM;
1271
1272         mlgroups = __va(paddr);
1273         num_mlgroups = count;
1274
1275         count = 0;
1276         mdesc_for_each_node_by_name(md, node, "memory-latency-group") {
1277                 struct mdesc_mlgroup *m = &mlgroups[count++];
1278                 const u64 *val;
1279
1280                 m->node = node;
1281
1282                 val = mdesc_get_property(md, node, "latency", NULL);
1283                 m->latency = *val;
1284                 val = mdesc_get_property(md, node, "address-match", NULL);
1285                 m->match = *val;
1286                 val = mdesc_get_property(md, node, "address-mask", NULL);
1287                 m->mask = *val;
1288
1289                 numadbg("MLGROUP[%d]: node[%llx] latency[%llx] "
1290                         "match[%llx] mask[%llx]\n",
1291                         count - 1, m->node, m->latency, m->match, m->mask);
1292         }
1293
1294         return 0;
1295 }
1296
1297 static int __init grab_mblocks(struct mdesc_handle *md)
1298 {
1299         unsigned long paddr;
1300         int count = 0;
1301         u64 node;
1302
1303         mdesc_for_each_node_by_name(md, node, "mblock")
1304                 count++;
1305         if (!count)
1306                 return -ENOENT;
1307
1308         paddr = memblock_phys_alloc(count * sizeof(struct mdesc_mblock),
1309                                     SMP_CACHE_BYTES);
1310         if (!paddr)
1311                 return -ENOMEM;
1312
1313         mblocks = __va(paddr);
1314         num_mblocks = count;
1315
1316         count = 0;
1317         mdesc_for_each_node_by_name(md, node, "mblock") {
1318                 struct mdesc_mblock *m = &mblocks[count++];
1319                 const u64 *val;
1320
1321                 val = mdesc_get_property(md, node, "base", NULL);
1322                 m->base = *val;
1323                 val = mdesc_get_property(md, node, "size", NULL);
1324                 m->size = *val;
1325                 val = mdesc_get_property(md, node,
1326                                          "address-congruence-offset", NULL);
1327
1328                 /* The address-congruence-offset property is optional.
1329                  * Explicity zero it be identifty this.
1330                  */
1331                 if (val)
1332                         m->offset = *val;
1333                 else
1334                         m->offset = 0UL;
1335
1336                 numadbg("MBLOCK[%d]: base[%llx] size[%llx] offset[%llx]\n",
1337                         count - 1, m->base, m->size, m->offset);
1338         }
1339
1340         return 0;
1341 }
1342
1343 static void __init numa_parse_mdesc_group_cpus(struct mdesc_handle *md,
1344                                                u64 grp, cpumask_t *mask)
1345 {
1346         u64 arc;
1347
1348         cpumask_clear(mask);
1349
1350         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_BACK) {
1351                 u64 target = mdesc_arc_target(md, arc);
1352                 const char *name = mdesc_node_name(md, target);
1353                 const u64 *id;
1354
1355                 if (strcmp(name, "cpu"))
1356                         continue;
1357                 id = mdesc_get_property(md, target, "id", NULL);
1358                 if (*id < nr_cpu_ids)
1359                         cpumask_set_cpu(*id, mask);
1360         }
1361 }
1362
1363 static struct mdesc_mlgroup * __init find_mlgroup(u64 node)
1364 {
1365         int i;
1366
1367         for (i = 0; i < num_mlgroups; i++) {
1368                 struct mdesc_mlgroup *m = &mlgroups[i];
1369                 if (m->node == node)
1370                         return m;
1371         }
1372         return NULL;
1373 }
1374
1375 int __node_distance(int from, int to)
1376 {
1377         if ((from >= MAX_NUMNODES) || (to >= MAX_NUMNODES)) {
1378                 pr_warn("Returning default NUMA distance value for %d->%d\n",
1379                         from, to);
1380                 return (from == to) ? LOCAL_DISTANCE : REMOTE_DISTANCE;
1381         }
1382         return numa_latency[from][to];
1383 }
1384 EXPORT_SYMBOL(__node_distance);
1385
1386 static int __init find_best_numa_node_for_mlgroup(struct mdesc_mlgroup *grp)
1387 {
1388         int i;
1389
1390         for (i = 0; i < MAX_NUMNODES; i++) {
1391                 struct node_mem_mask *n = &node_masks[i];
1392
1393                 if ((grp->mask == n->mask) && (grp->match == n->match))
1394                         break;
1395         }
1396         return i;
1397 }
1398
1399 static void __init find_numa_latencies_for_group(struct mdesc_handle *md,
1400                                                  u64 grp, int index)
1401 {
1402         u64 arc;
1403
1404         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
1405                 int tnode;
1406                 u64 target = mdesc_arc_target(md, arc);
1407                 struct mdesc_mlgroup *m = find_mlgroup(target);
1408
1409                 if (!m)
1410                         continue;
1411                 tnode = find_best_numa_node_for_mlgroup(m);
1412                 if (tnode == MAX_NUMNODES)
1413                         continue;
1414                 numa_latency[index][tnode] = m->latency;
1415         }
1416 }
1417
1418 static int __init numa_attach_mlgroup(struct mdesc_handle *md, u64 grp,
1419                                       int index)
1420 {
1421         struct mdesc_mlgroup *candidate = NULL;
1422         u64 arc, best_latency = ~(u64)0;
1423         struct node_mem_mask *n;
1424
1425         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
1426                 u64 target = mdesc_arc_target(md, arc);
1427                 struct mdesc_mlgroup *m = find_mlgroup(target);
1428                 if (!m)
1429                         continue;
1430                 if (m->latency < best_latency) {
1431                         candidate = m;
1432                         best_latency = m->latency;
1433                 }
1434         }
1435         if (!candidate)
1436                 return -ENOENT;
1437
1438         if (num_node_masks != index) {
1439                 printk(KERN_ERR "Inconsistent NUMA state, "
1440                        "index[%d] != num_node_masks[%d]\n",
1441                        index, num_node_masks);
1442                 return -EINVAL;
1443         }
1444
1445         n = &node_masks[num_node_masks++];
1446
1447         n->mask = candidate->mask;
1448         n->match = candidate->match;
1449
1450         numadbg("NUMA NODE[%d]: mask[%lx] match[%lx] (latency[%llx])\n",
1451                 index, n->mask, n->match, candidate->latency);
1452
1453         return 0;
1454 }
1455
1456 static int __init numa_parse_mdesc_group(struct mdesc_handle *md, u64 grp,
1457                                          int index)
1458 {
1459         cpumask_t mask;
1460         int cpu;
1461
1462         numa_parse_mdesc_group_cpus(md, grp, &mask);
1463
1464         for_each_cpu(cpu, &mask)
1465                 numa_cpu_lookup_table[cpu] = index;
1466         cpumask_copy(&numa_cpumask_lookup_table[index], &mask);
1467
1468         if (numa_debug) {
1469                 printk(KERN_INFO "NUMA GROUP[%d]: cpus [ ", index);
1470                 for_each_cpu(cpu, &mask)
1471                         printk("%d ", cpu);
1472                 printk("]\n");
1473         }
1474
1475         return numa_attach_mlgroup(md, grp, index);
1476 }
1477
1478 static int __init numa_parse_mdesc(void)
1479 {
1480         struct mdesc_handle *md = mdesc_grab();
1481         int i, j, err, count;
1482         u64 node;
1483
1484         node = mdesc_node_by_name(md, MDESC_NODE_NULL, "latency-groups");
1485         if (node == MDESC_NODE_NULL) {
1486                 mdesc_release(md);
1487                 return -ENOENT;
1488         }
1489
1490         err = grab_mblocks(md);
1491         if (err < 0)
1492                 goto out;
1493
1494         err = grab_mlgroups(md);
1495         if (err < 0)
1496                 goto out;
1497
1498         count = 0;
1499         mdesc_for_each_node_by_name(md, node, "group") {
1500                 err = numa_parse_mdesc_group(md, node, count);
1501                 if (err < 0)
1502                         break;
1503                 count++;
1504         }
1505
1506         count = 0;
1507         mdesc_for_each_node_by_name(md, node, "group") {
1508                 find_numa_latencies_for_group(md, node, count);
1509                 count++;
1510         }
1511
1512         /* Normalize numa latency matrix according to ACPI SLIT spec. */
1513         for (i = 0; i < MAX_NUMNODES; i++) {
1514                 u64 self_latency = numa_latency[i][i];
1515
1516                 for (j = 0; j < MAX_NUMNODES; j++) {
1517                         numa_latency[i][j] =
1518                                 (numa_latency[i][j] * LOCAL_DISTANCE) /
1519                                 self_latency;
1520                 }
1521         }
1522
1523         add_node_ranges();
1524
1525         for (i = 0; i < num_node_masks; i++) {
1526                 allocate_node_data(i);
1527                 node_set_online(i);
1528         }
1529
1530         err = 0;
1531 out:
1532         mdesc_release(md);
1533         return err;
1534 }
1535
1536 static int __init numa_parse_jbus(void)
1537 {
1538         unsigned long cpu, index;
1539
1540         /* NUMA node id is encoded in bits 36 and higher, and there is
1541          * a 1-to-1 mapping from CPU ID to NUMA node ID.
1542          */
1543         index = 0;
1544         for_each_present_cpu(cpu) {
1545                 numa_cpu_lookup_table[cpu] = index;
1546                 cpumask_copy(&numa_cpumask_lookup_table[index], cpumask_of(cpu));
1547                 node_masks[index].mask = ~((1UL << 36UL) - 1UL);
1548                 node_masks[index].match = cpu << 36UL;
1549
1550                 index++;
1551         }
1552         num_node_masks = index;
1553
1554         add_node_ranges();
1555
1556         for (index = 0; index < num_node_masks; index++) {
1557                 allocate_node_data(index);
1558                 node_set_online(index);
1559         }
1560
1561         return 0;
1562 }
1563
1564 static int __init numa_parse_sun4u(void)
1565 {
1566         if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1567                 unsigned long ver;
1568
1569                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
1570                 if ((ver >> 32UL) == __JALAPENO_ID ||
1571                     (ver >> 32UL) == __SERRANO_ID)
1572                         return numa_parse_jbus();
1573         }
1574         return -1;
1575 }
1576
1577 static int __init bootmem_init_numa(void)
1578 {
1579         int i, j;
1580         int err = -1;
1581
1582         numadbg("bootmem_init_numa()\n");
1583
1584         /* Some sane defaults for numa latency values */
1585         for (i = 0; i < MAX_NUMNODES; i++) {
1586                 for (j = 0; j < MAX_NUMNODES; j++)
1587                         numa_latency[i][j] = (i == j) ?
1588                                 LOCAL_DISTANCE : REMOTE_DISTANCE;
1589         }
1590
1591         if (numa_enabled) {
1592                 if (tlb_type == hypervisor)
1593                         err = numa_parse_mdesc();
1594                 else
1595                         err = numa_parse_sun4u();
1596         }
1597         return err;
1598 }
1599
1600 #else
1601
1602 static int bootmem_init_numa(void)
1603 {
1604         return -1;
1605 }
1606
1607 #endif
1608
1609 static void __init bootmem_init_nonnuma(void)
1610 {
1611         unsigned long top_of_ram = memblock_end_of_DRAM();
1612         unsigned long total_ram = memblock_phys_mem_size();
1613
1614         numadbg("bootmem_init_nonnuma()\n");
1615
1616         printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
1617                top_of_ram, total_ram);
1618         printk(KERN_INFO "Memory hole size: %ldMB\n",
1619                (top_of_ram - total_ram) >> 20);
1620
1621         init_node_masks_nonnuma();
1622         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
1623         allocate_node_data(0);
1624         node_set_online(0);
1625 }
1626
1627 static unsigned long __init bootmem_init(unsigned long phys_base)
1628 {
1629         unsigned long end_pfn;
1630
1631         end_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
1632         max_pfn = max_low_pfn = end_pfn;
1633         min_low_pfn = (phys_base >> PAGE_SHIFT);
1634
1635         if (bootmem_init_numa() < 0)
1636                 bootmem_init_nonnuma();
1637
1638         /* Dump memblock with node info. */
1639         memblock_dump_all();
1640
1641         /* XXX cpu notifier XXX */
1642
1643         sparse_memory_present_with_active_regions(MAX_NUMNODES);
1644         sparse_init();
1645
1646         return end_pfn;
1647 }
1648
1649 static struct linux_prom64_registers pall[MAX_BANKS] __initdata;
1650 static int pall_ents __initdata;
1651
1652 static unsigned long max_phys_bits = 40;
1653
1654 bool kern_addr_valid(unsigned long addr)
1655 {
1656         pgd_t *pgd;
1657         p4d_t *p4d;
1658         pud_t *pud;
1659         pmd_t *pmd;
1660         pte_t *pte;
1661
1662         if ((long)addr < 0L) {
1663                 unsigned long pa = __pa(addr);
1664
1665                 if ((pa >> max_phys_bits) != 0UL)
1666                         return false;
1667
1668                 return pfn_valid(pa >> PAGE_SHIFT);
1669         }
1670
1671         if (addr >= (unsigned long) KERNBASE &&
1672             addr < (unsigned long)&_end)
1673                 return true;
1674
1675         pgd = pgd_offset_k(addr);
1676         if (pgd_none(*pgd))
1677                 return 0;
1678
1679         p4d = p4d_offset(pgd, addr);
1680         if (p4d_none(*p4d))
1681                 return 0;
1682
1683         pud = pud_offset(p4d, addr);
1684         if (pud_none(*pud))
1685                 return 0;
1686
1687         if (pud_large(*pud))
1688                 return pfn_valid(pud_pfn(*pud));
1689
1690         pmd = pmd_offset(pud, addr);
1691         if (pmd_none(*pmd))
1692                 return 0;
1693
1694         if (pmd_large(*pmd))
1695                 return pfn_valid(pmd_pfn(*pmd));
1696
1697         pte = pte_offset_kernel(pmd, addr);
1698         if (pte_none(*pte))
1699                 return 0;
1700
1701         return pfn_valid(pte_pfn(*pte));
1702 }
1703 EXPORT_SYMBOL(kern_addr_valid);
1704
1705 static unsigned long __ref kernel_map_hugepud(unsigned long vstart,
1706                                               unsigned long vend,
1707                                               pud_t *pud)
1708 {
1709         const unsigned long mask16gb = (1UL << 34) - 1UL;
1710         u64 pte_val = vstart;
1711
1712         /* Each PUD is 8GB */
1713         if ((vstart & mask16gb) ||
1714             (vend - vstart <= mask16gb)) {
1715                 pte_val ^= kern_linear_pte_xor[2];
1716                 pud_val(*pud) = pte_val | _PAGE_PUD_HUGE;
1717
1718                 return vstart + PUD_SIZE;
1719         }
1720
1721         pte_val ^= kern_linear_pte_xor[3];
1722         pte_val |= _PAGE_PUD_HUGE;
1723
1724         vend = vstart + mask16gb + 1UL;
1725         while (vstart < vend) {
1726                 pud_val(*pud) = pte_val;
1727
1728                 pte_val += PUD_SIZE;
1729                 vstart += PUD_SIZE;
1730                 pud++;
1731         }
1732         return vstart;
1733 }
1734
1735 static bool kernel_can_map_hugepud(unsigned long vstart, unsigned long vend,
1736                                    bool guard)
1737 {
1738         if (guard && !(vstart & ~PUD_MASK) && (vend - vstart) >= PUD_SIZE)
1739                 return true;
1740
1741         return false;
1742 }
1743
1744 static unsigned long __ref kernel_map_hugepmd(unsigned long vstart,
1745                                               unsigned long vend,
1746                                               pmd_t *pmd)
1747 {
1748         const unsigned long mask256mb = (1UL << 28) - 1UL;
1749         const unsigned long mask2gb = (1UL << 31) - 1UL;
1750         u64 pte_val = vstart;
1751
1752         /* Each PMD is 8MB */
1753         if ((vstart & mask256mb) ||
1754             (vend - vstart <= mask256mb)) {
1755                 pte_val ^= kern_linear_pte_xor[0];
1756                 pmd_val(*pmd) = pte_val | _PAGE_PMD_HUGE;
1757
1758                 return vstart + PMD_SIZE;
1759         }
1760
1761         if ((vstart & mask2gb) ||
1762             (vend - vstart <= mask2gb)) {
1763                 pte_val ^= kern_linear_pte_xor[1];
1764                 pte_val |= _PAGE_PMD_HUGE;
1765                 vend = vstart + mask256mb + 1UL;
1766         } else {
1767                 pte_val ^= kern_linear_pte_xor[2];
1768                 pte_val |= _PAGE_PMD_HUGE;
1769                 vend = vstart + mask2gb + 1UL;
1770         }
1771
1772         while (vstart < vend) {
1773                 pmd_val(*pmd) = pte_val;
1774
1775                 pte_val += PMD_SIZE;
1776                 vstart += PMD_SIZE;
1777                 pmd++;
1778         }
1779
1780         return vstart;
1781 }
1782
1783 static bool kernel_can_map_hugepmd(unsigned long vstart, unsigned long vend,
1784                                    bool guard)
1785 {
1786         if (guard && !(vstart & ~PMD_MASK) && (vend - vstart) >= PMD_SIZE)
1787                 return true;
1788
1789         return false;
1790 }
1791
1792 static unsigned long __ref kernel_map_range(unsigned long pstart,
1793                                             unsigned long pend, pgprot_t prot,
1794                                             bool use_huge)
1795 {
1796         unsigned long vstart = PAGE_OFFSET + pstart;
1797         unsigned long vend = PAGE_OFFSET + pend;
1798         unsigned long alloc_bytes = 0UL;
1799
1800         if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
1801                 prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n",
1802                             vstart, vend);
1803                 prom_halt();
1804         }
1805
1806         while (vstart < vend) {
1807                 unsigned long this_end, paddr = __pa(vstart);
1808                 pgd_t *pgd = pgd_offset_k(vstart);
1809                 p4d_t *p4d;
1810                 pud_t *pud;
1811                 pmd_t *pmd;
1812                 pte_t *pte;
1813
1814                 if (pgd_none(*pgd)) {
1815                         pud_t *new;
1816
1817                         new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
1818                                                   PAGE_SIZE);
1819                         if (!new)
1820                                 goto err_alloc;
1821                         alloc_bytes += PAGE_SIZE;
1822                         pgd_populate(&init_mm, pgd, new);
1823                 }
1824
1825                 p4d = p4d_offset(pgd, vstart);
1826                 if (p4d_none(*p4d)) {
1827                         pud_t *new;
1828
1829                         new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
1830                                                   PAGE_SIZE);
1831                         if (!new)
1832                                 goto err_alloc;
1833                         alloc_bytes += PAGE_SIZE;
1834                         p4d_populate(&init_mm, p4d, new);
1835                 }
1836
1837                 pud = pud_offset(p4d, vstart);
1838                 if (pud_none(*pud)) {
1839                         pmd_t *new;
1840
1841                         if (kernel_can_map_hugepud(vstart, vend, use_huge)) {
1842                                 vstart = kernel_map_hugepud(vstart, vend, pud);
1843                                 continue;
1844                         }
1845                         new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
1846                                                   PAGE_SIZE);
1847                         if (!new)
1848                                 goto err_alloc;
1849                         alloc_bytes += PAGE_SIZE;
1850                         pud_populate(&init_mm, pud, new);
1851                 }
1852
1853                 pmd = pmd_offset(pud, vstart);
1854                 if (pmd_none(*pmd)) {
1855                         pte_t *new;
1856
1857                         if (kernel_can_map_hugepmd(vstart, vend, use_huge)) {
1858                                 vstart = kernel_map_hugepmd(vstart, vend, pmd);
1859                                 continue;
1860                         }
1861                         new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
1862                                                   PAGE_SIZE);
1863                         if (!new)
1864                                 goto err_alloc;
1865                         alloc_bytes += PAGE_SIZE;
1866                         pmd_populate_kernel(&init_mm, pmd, new);
1867                 }
1868
1869                 pte = pte_offset_kernel(pmd, vstart);
1870                 this_end = (vstart + PMD_SIZE) & PMD_MASK;
1871                 if (this_end > vend)
1872                         this_end = vend;
1873
1874                 while (vstart < this_end) {
1875                         pte_val(*pte) = (paddr | pgprot_val(prot));
1876
1877                         vstart += PAGE_SIZE;
1878                         paddr += PAGE_SIZE;
1879                         pte++;
1880                 }
1881         }
1882
1883         return alloc_bytes;
1884
1885 err_alloc:
1886         panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
1887               __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
1888         return -ENOMEM;
1889 }
1890
1891 static void __init flush_all_kernel_tsbs(void)
1892 {
1893         int i;
1894
1895         for (i = 0; i < KERNEL_TSB_NENTRIES; i++) {
1896                 struct tsb *ent = &swapper_tsb[i];
1897
1898                 ent->tag = (1UL << TSB_TAG_INVALID_BIT);
1899         }
1900 #ifndef CONFIG_DEBUG_PAGEALLOC
1901         for (i = 0; i < KERNEL_TSB4M_NENTRIES; i++) {
1902                 struct tsb *ent = &swapper_4m_tsb[i];
1903
1904                 ent->tag = (1UL << TSB_TAG_INVALID_BIT);
1905         }
1906 #endif
1907 }
1908
1909 extern unsigned int kvmap_linear_patch[1];
1910
1911 static void __init kernel_physical_mapping_init(void)
1912 {
1913         unsigned long i, mem_alloced = 0UL;
1914         bool use_huge = true;
1915
1916 #ifdef CONFIG_DEBUG_PAGEALLOC
1917         use_huge = false;
1918 #endif
1919         for (i = 0; i < pall_ents; i++) {
1920                 unsigned long phys_start, phys_end;
1921
1922                 phys_start = pall[i].phys_addr;
1923                 phys_end = phys_start + pall[i].reg_size;
1924
1925                 mem_alloced += kernel_map_range(phys_start, phys_end,
1926                                                 PAGE_KERNEL, use_huge);
1927         }
1928
1929         printk("Allocated %ld bytes for kernel page tables.\n",
1930                mem_alloced);
1931
1932         kvmap_linear_patch[0] = 0x01000000; /* nop */
1933         flushi(&kvmap_linear_patch[0]);
1934
1935         flush_all_kernel_tsbs();
1936
1937         __flush_tlb_all();
1938 }
1939
1940 #ifdef CONFIG_DEBUG_PAGEALLOC
1941 void __kernel_map_pages(struct page *page, int numpages, int enable)
1942 {
1943         unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
1944         unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
1945
1946         kernel_map_range(phys_start, phys_end,
1947                          (enable ? PAGE_KERNEL : __pgprot(0)), false);
1948
1949         flush_tsb_kernel_range(PAGE_OFFSET + phys_start,
1950                                PAGE_OFFSET + phys_end);
1951
1952         /* we should perform an IPI and flush all tlbs,
1953          * but that can deadlock->flush only current cpu.
1954          */
1955         __flush_tlb_kernel_range(PAGE_OFFSET + phys_start,
1956                                  PAGE_OFFSET + phys_end);
1957 }
1958 #endif
1959
1960 unsigned long __init find_ecache_flush_span(unsigned long size)
1961 {
1962         int i;
1963
1964         for (i = 0; i < pavail_ents; i++) {
1965                 if (pavail[i].reg_size >= size)
1966                         return pavail[i].phys_addr;
1967         }
1968
1969         return ~0UL;
1970 }
1971
1972 unsigned long PAGE_OFFSET;
1973 EXPORT_SYMBOL(PAGE_OFFSET);
1974
1975 unsigned long VMALLOC_END   = 0x0000010000000000UL;
1976 EXPORT_SYMBOL(VMALLOC_END);
1977
1978 unsigned long sparc64_va_hole_top =    0xfffff80000000000UL;
1979 unsigned long sparc64_va_hole_bottom = 0x0000080000000000UL;
1980
1981 static void __init setup_page_offset(void)
1982 {
1983         if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1984                 /* Cheetah/Panther support a full 64-bit virtual
1985                  * address, so we can use all that our page tables
1986                  * support.
1987                  */
1988                 sparc64_va_hole_top =    0xfff0000000000000UL;
1989                 sparc64_va_hole_bottom = 0x0010000000000000UL;
1990
1991                 max_phys_bits = 42;
1992         } else if (tlb_type == hypervisor) {
1993                 switch (sun4v_chip_type) {
1994                 case SUN4V_CHIP_NIAGARA1:
1995                 case SUN4V_CHIP_NIAGARA2:
1996                         /* T1 and T2 support 48-bit virtual addresses.  */
1997                         sparc64_va_hole_top =    0xffff800000000000UL;
1998                         sparc64_va_hole_bottom = 0x0000800000000000UL;
1999
2000                         max_phys_bits = 39;
2001                         break;
2002                 case SUN4V_CHIP_NIAGARA3:
2003                         /* T3 supports 48-bit virtual addresses.  */
2004                         sparc64_va_hole_top =    0xffff800000000000UL;
2005                         sparc64_va_hole_bottom = 0x0000800000000000UL;
2006
2007                         max_phys_bits = 43;
2008                         break;
2009                 case SUN4V_CHIP_NIAGARA4:
2010                 case SUN4V_CHIP_NIAGARA5:
2011                 case SUN4V_CHIP_SPARC64X:
2012                 case SUN4V_CHIP_SPARC_M6:
2013                         /* T4 and later support 52-bit virtual addresses.  */
2014                         sparc64_va_hole_top =    0xfff8000000000000UL;
2015                         sparc64_va_hole_bottom = 0x0008000000000000UL;
2016                         max_phys_bits = 47;
2017                         break;
2018                 case SUN4V_CHIP_SPARC_M7:
2019                 case SUN4V_CHIP_SPARC_SN:
2020                         /* M7 and later support 52-bit virtual addresses.  */
2021                         sparc64_va_hole_top =    0xfff8000000000000UL;
2022                         sparc64_va_hole_bottom = 0x0008000000000000UL;
2023                         max_phys_bits = 49;
2024                         break;
2025                 case SUN4V_CHIP_SPARC_M8:
2026                 default:
2027                         /* M8 and later support 54-bit virtual addresses.
2028                          * However, restricting M8 and above VA bits to 53
2029                          * as 4-level page table cannot support more than
2030                          * 53 VA bits.
2031                          */
2032                         sparc64_va_hole_top =    0xfff0000000000000UL;
2033                         sparc64_va_hole_bottom = 0x0010000000000000UL;
2034                         max_phys_bits = 51;
2035                         break;
2036                 }
2037         }
2038
2039         if (max_phys_bits > MAX_PHYS_ADDRESS_BITS) {
2040                 prom_printf("MAX_PHYS_ADDRESS_BITS is too small, need %lu\n",
2041                             max_phys_bits);
2042                 prom_halt();
2043         }
2044
2045         PAGE_OFFSET = sparc64_va_hole_top;
2046         VMALLOC_END = ((sparc64_va_hole_bottom >> 1) +
2047                        (sparc64_va_hole_bottom >> 2));
2048
2049         pr_info("MM: PAGE_OFFSET is 0x%016lx (max_phys_bits == %lu)\n",
2050                 PAGE_OFFSET, max_phys_bits);
2051         pr_info("MM: VMALLOC [0x%016lx --> 0x%016lx]\n",
2052                 VMALLOC_START, VMALLOC_END);
2053         pr_info("MM: VMEMMAP [0x%016lx --> 0x%016lx]\n",
2054                 VMEMMAP_BASE, VMEMMAP_BASE << 1);
2055 }
2056
2057 static void __init tsb_phys_patch(void)
2058 {
2059         struct tsb_ldquad_phys_patch_entry *pquad;
2060         struct tsb_phys_patch_entry *p;
2061
2062         pquad = &__tsb_ldquad_phys_patch;
2063         while (pquad < &__tsb_ldquad_phys_patch_end) {
2064                 unsigned long addr = pquad->addr;
2065
2066                 if (tlb_type == hypervisor)
2067                         *(unsigned int *) addr = pquad->sun4v_insn;
2068                 else
2069                         *(unsigned int *) addr = pquad->sun4u_insn;
2070                 wmb();
2071                 __asm__ __volatile__("flush     %0"
2072                                      : /* no outputs */
2073                                      : "r" (addr));
2074
2075                 pquad++;
2076         }
2077
2078         p = &__tsb_phys_patch;
2079         while (p < &__tsb_phys_patch_end) {
2080                 unsigned long addr = p->addr;
2081
2082                 *(unsigned int *) addr = p->insn;
2083                 wmb();
2084                 __asm__ __volatile__("flush     %0"
2085                                      : /* no outputs */
2086                                      : "r" (addr));
2087
2088                 p++;
2089         }
2090 }
2091
2092 /* Don't mark as init, we give this to the Hypervisor.  */
2093 #ifndef CONFIG_DEBUG_PAGEALLOC
2094 #define NUM_KTSB_DESCR  2
2095 #else
2096 #define NUM_KTSB_DESCR  1
2097 #endif
2098 static struct hv_tsb_descr ktsb_descr[NUM_KTSB_DESCR];
2099
2100 /* The swapper TSBs are loaded with a base sequence of:
2101  *
2102  *      sethi   %uhi(SYMBOL), REG1
2103  *      sethi   %hi(SYMBOL), REG2
2104  *      or      REG1, %ulo(SYMBOL), REG1
2105  *      or      REG2, %lo(SYMBOL), REG2
2106  *      sllx    REG1, 32, REG1
2107  *      or      REG1, REG2, REG1
2108  *
2109  * When we use physical addressing for the TSB accesses, we patch the
2110  * first four instructions in the above sequence.
2111  */
2112
2113 static void patch_one_ktsb_phys(unsigned int *start, unsigned int *end, unsigned long pa)
2114 {
2115         unsigned long high_bits, low_bits;
2116
2117         high_bits = (pa >> 32) & 0xffffffff;
2118         low_bits = (pa >> 0) & 0xffffffff;
2119
2120         while (start < end) {
2121                 unsigned int *ia = (unsigned int *)(unsigned long)*start;
2122
2123                 ia[0] = (ia[0] & ~0x3fffff) | (high_bits >> 10);
2124                 __asm__ __volatile__("flush     %0" : : "r" (ia));
2125
2126                 ia[1] = (ia[1] & ~0x3fffff) | (low_bits >> 10);
2127                 __asm__ __volatile__("flush     %0" : : "r" (ia + 1));
2128
2129                 ia[2] = (ia[2] & ~0x1fff) | (high_bits & 0x3ff);
2130                 __asm__ __volatile__("flush     %0" : : "r" (ia + 2));
2131
2132                 ia[3] = (ia[3] & ~0x1fff) | (low_bits & 0x3ff);
2133                 __asm__ __volatile__("flush     %0" : : "r" (ia + 3));
2134
2135                 start++;
2136         }
2137 }
2138
2139 static void ktsb_phys_patch(void)
2140 {
2141         extern unsigned int __swapper_tsb_phys_patch;
2142         extern unsigned int __swapper_tsb_phys_patch_end;
2143         unsigned long ktsb_pa;
2144
2145         ktsb_pa = kern_base + ((unsigned long)&swapper_tsb[0] - KERNBASE);
2146         patch_one_ktsb_phys(&__swapper_tsb_phys_patch,
2147                             &__swapper_tsb_phys_patch_end, ktsb_pa);
2148 #ifndef CONFIG_DEBUG_PAGEALLOC
2149         {
2150         extern unsigned int __swapper_4m_tsb_phys_patch;
2151         extern unsigned int __swapper_4m_tsb_phys_patch_end;
2152         ktsb_pa = (kern_base +
2153                    ((unsigned long)&swapper_4m_tsb[0] - KERNBASE));
2154         patch_one_ktsb_phys(&__swapper_4m_tsb_phys_patch,
2155                             &__swapper_4m_tsb_phys_patch_end, ktsb_pa);
2156         }
2157 #endif
2158 }
2159
2160 static void __init sun4v_ktsb_init(void)
2161 {
2162         unsigned long ktsb_pa;
2163
2164         /* First KTSB for PAGE_SIZE mappings.  */
2165         ktsb_pa = kern_base + ((unsigned long)&swapper_tsb[0] - KERNBASE);
2166
2167         switch (PAGE_SIZE) {
2168         case 8 * 1024:
2169         default:
2170                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_8K;
2171                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_8K;
2172                 break;
2173
2174         case 64 * 1024:
2175                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_64K;
2176                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_64K;
2177                 break;
2178
2179         case 512 * 1024:
2180                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_512K;
2181                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_512K;
2182                 break;
2183
2184         case 4 * 1024 * 1024:
2185                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_4MB;
2186                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_4MB;
2187                 break;
2188         }
2189
2190         ktsb_descr[0].assoc = 1;
2191         ktsb_descr[0].num_ttes = KERNEL_TSB_NENTRIES;
2192         ktsb_descr[0].ctx_idx = 0;
2193         ktsb_descr[0].tsb_base = ktsb_pa;
2194         ktsb_descr[0].resv = 0;
2195
2196 #ifndef CONFIG_DEBUG_PAGEALLOC
2197         /* Second KTSB for 4MB/256MB/2GB/16GB mappings.  */
2198         ktsb_pa = (kern_base +
2199                    ((unsigned long)&swapper_4m_tsb[0] - KERNBASE));
2200
2201         ktsb_descr[1].pgsz_idx = HV_PGSZ_IDX_4MB;
2202         ktsb_descr[1].pgsz_mask = ((HV_PGSZ_MASK_4MB |
2203                                     HV_PGSZ_MASK_256MB |
2204                                     HV_PGSZ_MASK_2GB |
2205                                     HV_PGSZ_MASK_16GB) &
2206                                    cpu_pgsz_mask);
2207         ktsb_descr[1].assoc = 1;
2208         ktsb_descr[1].num_ttes = KERNEL_TSB4M_NENTRIES;
2209         ktsb_descr[1].ctx_idx = 0;
2210         ktsb_descr[1].tsb_base = ktsb_pa;
2211         ktsb_descr[1].resv = 0;
2212 #endif
2213 }
2214
2215 void sun4v_ktsb_register(void)
2216 {
2217         unsigned long pa, ret;
2218
2219         pa = kern_base + ((unsigned long)&ktsb_descr[0] - KERNBASE);
2220
2221         ret = sun4v_mmu_tsb_ctx0(NUM_KTSB_DESCR, pa);
2222         if (ret != 0) {
2223                 prom_printf("hypervisor_mmu_tsb_ctx0[%lx]: "
2224                             "errors with %lx\n", pa, ret);
2225                 prom_halt();
2226         }
2227 }
2228
2229 static void __init sun4u_linear_pte_xor_finalize(void)
2230 {
2231 #ifndef CONFIG_DEBUG_PAGEALLOC
2232         /* This is where we would add Panther support for
2233          * 32MB and 256MB pages.
2234          */
2235 #endif
2236 }
2237
2238 static void __init sun4v_linear_pte_xor_finalize(void)
2239 {
2240         unsigned long pagecv_flag;
2241
2242         /* Bit 9 of TTE is no longer CV bit on M7 processor and it instead
2243          * enables MCD error. Do not set bit 9 on M7 processor.
2244          */
2245         switch (sun4v_chip_type) {
2246         case SUN4V_CHIP_SPARC_M7:
2247         case SUN4V_CHIP_SPARC_M8:
2248         case SUN4V_CHIP_SPARC_SN:
2249                 pagecv_flag = 0x00;
2250                 break;
2251         default:
2252                 pagecv_flag = _PAGE_CV_4V;
2253                 break;
2254         }
2255 #ifndef CONFIG_DEBUG_PAGEALLOC
2256         if (cpu_pgsz_mask & HV_PGSZ_MASK_256MB) {
2257                 kern_linear_pte_xor[1] = (_PAGE_VALID | _PAGE_SZ256MB_4V) ^
2258                         PAGE_OFFSET;
2259                 kern_linear_pte_xor[1] |= (_PAGE_CP_4V | pagecv_flag |
2260                                            _PAGE_P_4V | _PAGE_W_4V);
2261         } else {
2262                 kern_linear_pte_xor[1] = kern_linear_pte_xor[0];
2263         }
2264
2265         if (cpu_pgsz_mask & HV_PGSZ_MASK_2GB) {
2266                 kern_linear_pte_xor[2] = (_PAGE_VALID | _PAGE_SZ2GB_4V) ^
2267                         PAGE_OFFSET;
2268                 kern_linear_pte_xor[2] |= (_PAGE_CP_4V | pagecv_flag |
2269                                            _PAGE_P_4V | _PAGE_W_4V);
2270         } else {
2271                 kern_linear_pte_xor[2] = kern_linear_pte_xor[1];
2272         }
2273
2274         if (cpu_pgsz_mask & HV_PGSZ_MASK_16GB) {
2275                 kern_linear_pte_xor[3] = (_PAGE_VALID | _PAGE_SZ16GB_4V) ^
2276                         PAGE_OFFSET;
2277                 kern_linear_pte_xor[3] |= (_PAGE_CP_4V | pagecv_flag |
2278                                            _PAGE_P_4V | _PAGE_W_4V);
2279         } else {
2280                 kern_linear_pte_xor[3] = kern_linear_pte_xor[2];
2281         }
2282 #endif
2283 }
2284
2285 /* paging_init() sets up the page tables */
2286
2287 static unsigned long last_valid_pfn;
2288
2289 static void sun4u_pgprot_init(void);
2290 static void sun4v_pgprot_init(void);
2291
2292 #define _PAGE_CACHE_4U  (_PAGE_CP_4U | _PAGE_CV_4U)
2293 #define _PAGE_CACHE_4V  (_PAGE_CP_4V | _PAGE_CV_4V)
2294 #define __DIRTY_BITS_4U  (_PAGE_MODIFIED_4U | _PAGE_WRITE_4U | _PAGE_W_4U)
2295 #define __DIRTY_BITS_4V  (_PAGE_MODIFIED_4V | _PAGE_WRITE_4V | _PAGE_W_4V)
2296 #define __ACCESS_BITS_4U (_PAGE_ACCESSED_4U | _PAGE_READ_4U | _PAGE_R)
2297 #define __ACCESS_BITS_4V (_PAGE_ACCESSED_4V | _PAGE_READ_4V | _PAGE_R)
2298
2299 /* We need to exclude reserved regions. This exclusion will include
2300  * vmlinux and initrd. To be more precise the initrd size could be used to
2301  * compute a new lower limit because it is freed later during initialization.
2302  */
2303 static void __init reduce_memory(phys_addr_t limit_ram)
2304 {
2305         limit_ram += memblock_reserved_size();
2306         memblock_enforce_memory_limit(limit_ram);
2307 }
2308
2309 void __init paging_init(void)
2310 {
2311         unsigned long end_pfn, shift, phys_base;
2312         unsigned long real_end, i;
2313
2314         setup_page_offset();
2315
2316         /* These build time checkes make sure that the dcache_dirty_cpu()
2317          * page->flags usage will work.
2318          *
2319          * When a page gets marked as dcache-dirty, we store the
2320          * cpu number starting at bit 32 in the page->flags.  Also,
2321          * functions like clear_dcache_dirty_cpu use the cpu mask
2322          * in 13-bit signed-immediate instruction fields.
2323          */
2324
2325         /*
2326          * Page flags must not reach into upper 32 bits that are used
2327          * for the cpu number
2328          */
2329         BUILD_BUG_ON(NR_PAGEFLAGS > 32);
2330
2331         /*
2332          * The bit fields placed in the high range must not reach below
2333          * the 32 bit boundary. Otherwise we cannot place the cpu field
2334          * at the 32 bit boundary.
2335          */
2336         BUILD_BUG_ON(SECTIONS_WIDTH + NODES_WIDTH + ZONES_WIDTH +
2337                 ilog2(roundup_pow_of_two(NR_CPUS)) > 32);
2338
2339         BUILD_BUG_ON(NR_CPUS > 4096);
2340
2341         kern_base = (prom_boot_mapping_phys_low >> ILOG2_4MB) << ILOG2_4MB;
2342         kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
2343
2344         /* Invalidate both kernel TSBs.  */
2345         memset(swapper_tsb, 0x40, sizeof(swapper_tsb));
2346 #ifndef CONFIG_DEBUG_PAGEALLOC
2347         memset(swapper_4m_tsb, 0x40, sizeof(swapper_4m_tsb));
2348 #endif
2349
2350         /* TTE.cv bit on sparc v9 occupies the same position as TTE.mcde
2351          * bit on M7 processor. This is a conflicting usage of the same
2352          * bit. Enabling TTE.cv on M7 would turn on Memory Corruption
2353          * Detection error on all pages and this will lead to problems
2354          * later. Kernel does not run with MCD enabled and hence rest
2355          * of the required steps to fully configure memory corruption
2356          * detection are not taken. We need to ensure TTE.mcde is not
2357          * set on M7 processor. Compute the value of cacheability
2358          * flag for use later taking this into consideration.
2359          */
2360         switch (sun4v_chip_type) {
2361         case SUN4V_CHIP_SPARC_M7:
2362         case SUN4V_CHIP_SPARC_M8:
2363         case SUN4V_CHIP_SPARC_SN:
2364                 page_cache4v_flag = _PAGE_CP_4V;
2365                 break;
2366         default:
2367                 page_cache4v_flag = _PAGE_CACHE_4V;
2368                 break;
2369         }
2370
2371         if (tlb_type == hypervisor)
2372                 sun4v_pgprot_init();
2373         else
2374                 sun4u_pgprot_init();
2375
2376         if (tlb_type == cheetah_plus ||
2377             tlb_type == hypervisor) {
2378                 tsb_phys_patch();
2379                 ktsb_phys_patch();
2380         }
2381
2382         if (tlb_type == hypervisor)
2383                 sun4v_patch_tlb_handlers();
2384
2385         /* Find available physical memory...
2386          *
2387          * Read it twice in order to work around a bug in openfirmware.
2388          * The call to grab this table itself can cause openfirmware to
2389          * allocate memory, which in turn can take away some space from
2390          * the list of available memory.  Reading it twice makes sure
2391          * we really do get the final value.
2392          */
2393         read_obp_translations();
2394         read_obp_memory("reg", &pall[0], &pall_ents);
2395         read_obp_memory("available", &pavail[0], &pavail_ents);
2396         read_obp_memory("available", &pavail[0], &pavail_ents);
2397
2398         phys_base = 0xffffffffffffffffUL;
2399         for (i = 0; i < pavail_ents; i++) {
2400                 phys_base = min(phys_base, pavail[i].phys_addr);
2401                 memblock_add(pavail[i].phys_addr, pavail[i].reg_size);
2402         }
2403
2404         memblock_reserve(kern_base, kern_size);
2405
2406         find_ramdisk(phys_base);
2407
2408         if (cmdline_memory_size)
2409                 reduce_memory(cmdline_memory_size);
2410
2411         memblock_allow_resize();
2412         memblock_dump_all();
2413
2414         set_bit(0, mmu_context_bmap);
2415
2416         shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);
2417
2418         real_end = (unsigned long)_end;
2419         num_kernel_image_mappings = DIV_ROUND_UP(real_end - KERNBASE, 1 << ILOG2_4MB);
2420         printk("Kernel: Using %d locked TLB entries for main kernel image.\n",
2421                num_kernel_image_mappings);
2422
2423         /* Set kernel pgd to upper alias so physical page computations
2424          * work.
2425          */
2426         init_mm.pgd += ((shift) / (sizeof(pgd_t)));
2427
2428         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
2429
2430         inherit_prom_mappings();
2431
2432         /* Ok, we can use our TLB miss and window trap handlers safely.  */
2433         setup_tba();
2434
2435         __flush_tlb_all();
2436
2437         prom_build_devicetree();
2438         of_populate_present_mask();
2439 #ifndef CONFIG_SMP
2440         of_fill_in_cpu_data();
2441 #endif
2442
2443         if (tlb_type == hypervisor) {
2444                 sun4v_mdesc_init();
2445                 mdesc_populate_present_mask(cpu_all_mask);
2446 #ifndef CONFIG_SMP
2447                 mdesc_fill_in_cpu_data(cpu_all_mask);
2448 #endif
2449                 mdesc_get_page_sizes(cpu_all_mask, &cpu_pgsz_mask);
2450
2451                 sun4v_linear_pte_xor_finalize();
2452
2453                 sun4v_ktsb_init();
2454                 sun4v_ktsb_register();
2455         } else {
2456                 unsigned long impl, ver;
2457
2458                 cpu_pgsz_mask = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
2459                                  HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
2460
2461                 __asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
2462                 impl = ((ver >> 32) & 0xffff);
2463                 if (impl == PANTHER_IMPL)
2464                         cpu_pgsz_mask |= (HV_PGSZ_MASK_32MB |
2465                                           HV_PGSZ_MASK_256MB);
2466
2467                 sun4u_linear_pte_xor_finalize();
2468         }
2469
2470         /* Flush the TLBs and the 4M TSB so that the updated linear
2471          * pte XOR settings are realized for all mappings.
2472          */
2473         __flush_tlb_all();
2474 #ifndef CONFIG_DEBUG_PAGEALLOC
2475         memset(swapper_4m_tsb, 0x40, sizeof(swapper_4m_tsb));
2476 #endif
2477         __flush_tlb_all();
2478
2479         /* Setup bootmem... */
2480         last_valid_pfn = end_pfn = bootmem_init(phys_base);
2481
2482         kernel_physical_mapping_init();
2483
2484         {
2485                 unsigned long max_zone_pfns[MAX_NR_ZONES];
2486
2487                 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
2488
2489                 max_zone_pfns[ZONE_NORMAL] = end_pfn;
2490
2491                 free_area_init_nodes(max_zone_pfns);
2492         }
2493
2494         printk("Booting Linux...\n");
2495 }
2496
2497 int page_in_phys_avail(unsigned long paddr)
2498 {
2499         int i;
2500
2501         paddr &= PAGE_MASK;
2502
2503         for (i = 0; i < pavail_ents; i++) {
2504                 unsigned long start, end;
2505
2506                 start = pavail[i].phys_addr;
2507                 end = start + pavail[i].reg_size;
2508
2509                 if (paddr >= start && paddr < end)
2510                         return 1;
2511         }
2512         if (paddr >= kern_base && paddr < (kern_base + kern_size))
2513                 return 1;
2514 #ifdef CONFIG_BLK_DEV_INITRD
2515         if (paddr >= __pa(initrd_start) &&
2516             paddr < __pa(PAGE_ALIGN(initrd_end)))
2517                 return 1;
2518 #endif
2519
2520         return 0;
2521 }
2522
2523 static void __init register_page_bootmem_info(void)
2524 {
2525 #ifdef CONFIG_NEED_MULTIPLE_NODES
2526         int i;
2527
2528         for_each_online_node(i)
2529                 if (NODE_DATA(i)->node_spanned_pages)
2530                         register_page_bootmem_info_node(NODE_DATA(i));
2531 #endif
2532 }
2533 void __init mem_init(void)
2534 {
2535         high_memory = __va(last_valid_pfn << PAGE_SHIFT);
2536
2537         memblock_free_all();
2538
2539         /*
2540          * Must be done after boot memory is put on freelist, because here we
2541          * might set fields in deferred struct pages that have not yet been
2542          * initialized, and memblock_free_all() initializes all the reserved
2543          * deferred pages for us.
2544          */
2545         register_page_bootmem_info();
2546
2547         /*
2548          * Set up the zero page, mark it reserved, so that page count
2549          * is not manipulated when freeing the page from user ptes.
2550          */
2551         mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0);
2552         if (mem_map_zero == NULL) {
2553                 prom_printf("paging_init: Cannot alloc zero page.\n");
2554                 prom_halt();
2555         }
2556         mark_page_reserved(mem_map_zero);
2557
2558         mem_init_print_info(NULL);
2559
2560         if (tlb_type == cheetah || tlb_type == cheetah_plus)
2561                 cheetah_ecache_flush_init();
2562 }
2563
2564 void free_initmem(void)
2565 {
2566         unsigned long addr, initend;
2567         int do_free = 1;
2568
2569         /* If the physical memory maps were trimmed by kernel command
2570          * line options, don't even try freeing this initmem stuff up.
2571          * The kernel image could have been in the trimmed out region
2572          * and if so the freeing below will free invalid page structs.
2573          */
2574         if (cmdline_memory_size)
2575                 do_free = 0;
2576
2577         /*
2578          * The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
2579          */
2580         addr = PAGE_ALIGN((unsigned long)(__init_begin));
2581         initend = (unsigned long)(__init_end) & PAGE_MASK;
2582         for (; addr < initend; addr += PAGE_SIZE) {
2583                 unsigned long page;
2584
2585                 page = (addr +
2586                         ((unsigned long) __va(kern_base)) -
2587                         ((unsigned long) KERNBASE));
2588                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
2589
2590                 if (do_free)
2591                         free_reserved_page(virt_to_page(page));
2592         }
2593 }
2594
2595 pgprot_t PAGE_KERNEL __read_mostly;
2596 EXPORT_SYMBOL(PAGE_KERNEL);
2597
2598 pgprot_t PAGE_KERNEL_LOCKED __read_mostly;
2599 pgprot_t PAGE_COPY __read_mostly;
2600
2601 pgprot_t PAGE_SHARED __read_mostly;
2602 EXPORT_SYMBOL(PAGE_SHARED);
2603
2604 unsigned long pg_iobits __read_mostly;
2605
2606 unsigned long _PAGE_IE __read_mostly;
2607 EXPORT_SYMBOL(_PAGE_IE);
2608
2609 unsigned long _PAGE_E __read_mostly;
2610 EXPORT_SYMBOL(_PAGE_E);
2611
2612 unsigned long _PAGE_CACHE __read_mostly;
2613 EXPORT_SYMBOL(_PAGE_CACHE);
2614
2615 #ifdef CONFIG_SPARSEMEM_VMEMMAP
2616 int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
2617                                int node, struct vmem_altmap *altmap)
2618 {
2619         unsigned long pte_base;
2620
2621         pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4U |
2622                     _PAGE_CP_4U | _PAGE_CV_4U |
2623                     _PAGE_P_4U | _PAGE_W_4U);
2624         if (tlb_type == hypervisor)
2625                 pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4V |
2626                             page_cache4v_flag | _PAGE_P_4V | _PAGE_W_4V);
2627
2628         pte_base |= _PAGE_PMD_HUGE;
2629
2630         vstart = vstart & PMD_MASK;
2631         vend = ALIGN(vend, PMD_SIZE);
2632         for (; vstart < vend; vstart += PMD_SIZE) {
2633                 pgd_t *pgd = vmemmap_pgd_populate(vstart, node);
2634                 unsigned long pte;
2635                 p4d_t *p4d;
2636                 pud_t *pud;
2637                 pmd_t *pmd;
2638
2639                 if (!pgd)
2640                         return -ENOMEM;
2641
2642                 p4d = vmemmap_p4d_populate(pgd, vstart, node);
2643                 if (!p4d)
2644                         return -ENOMEM;
2645
2646                 pud = vmemmap_pud_populate(p4d, vstart, node);
2647                 if (!pud)
2648                         return -ENOMEM;
2649
2650                 pmd = pmd_offset(pud, vstart);
2651                 pte = pmd_val(*pmd);
2652                 if (!(pte & _PAGE_VALID)) {
2653                         void *block = vmemmap_alloc_block(PMD_SIZE, node);
2654
2655                         if (!block)
2656                                 return -ENOMEM;
2657
2658                         pmd_val(*pmd) = pte_base | __pa(block);
2659                 }
2660         }
2661
2662         return 0;
2663 }
2664
2665 void vmemmap_free(unsigned long start, unsigned long end,
2666                 struct vmem_altmap *altmap)
2667 {
2668 }
2669 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
2670
2671 static void prot_init_common(unsigned long page_none,
2672                              unsigned long page_shared,
2673                              unsigned long page_copy,
2674                              unsigned long page_readonly,
2675                              unsigned long page_exec_bit)
2676 {
2677         PAGE_COPY = __pgprot(page_copy);
2678         PAGE_SHARED = __pgprot(page_shared);
2679
2680         protection_map[0x0] = __pgprot(page_none);
2681         protection_map[0x1] = __pgprot(page_readonly & ~page_exec_bit);
2682         protection_map[0x2] = __pgprot(page_copy & ~page_exec_bit);
2683         protection_map[0x3] = __pgprot(page_copy & ~page_exec_bit);
2684         protection_map[0x4] = __pgprot(page_readonly);
2685         protection_map[0x5] = __pgprot(page_readonly);
2686         protection_map[0x6] = __pgprot(page_copy);
2687         protection_map[0x7] = __pgprot(page_copy);
2688         protection_map[0x8] = __pgprot(page_none);
2689         protection_map[0x9] = __pgprot(page_readonly & ~page_exec_bit);
2690         protection_map[0xa] = __pgprot(page_shared & ~page_exec_bit);
2691         protection_map[0xb] = __pgprot(page_shared & ~page_exec_bit);
2692         protection_map[0xc] = __pgprot(page_readonly);
2693         protection_map[0xd] = __pgprot(page_readonly);
2694         protection_map[0xe] = __pgprot(page_shared);
2695         protection_map[0xf] = __pgprot(page_shared);
2696 }
2697
2698 static void __init sun4u_pgprot_init(void)
2699 {
2700         unsigned long page_none, page_shared, page_copy, page_readonly;
2701         unsigned long page_exec_bit;
2702         int i;
2703
2704         PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
2705                                 _PAGE_CACHE_4U | _PAGE_P_4U |
2706                                 __ACCESS_BITS_4U | __DIRTY_BITS_4U |
2707                                 _PAGE_EXEC_4U);
2708         PAGE_KERNEL_LOCKED = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
2709                                        _PAGE_CACHE_4U | _PAGE_P_4U |
2710                                        __ACCESS_BITS_4U | __DIRTY_BITS_4U |
2711                                        _PAGE_EXEC_4U | _PAGE_L_4U);
2712
2713         _PAGE_IE = _PAGE_IE_4U;
2714         _PAGE_E = _PAGE_E_4U;
2715         _PAGE_CACHE = _PAGE_CACHE_4U;
2716
2717         pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4U | __DIRTY_BITS_4U |
2718                      __ACCESS_BITS_4U | _PAGE_E_4U);
2719
2720 #ifdef CONFIG_DEBUG_PAGEALLOC
2721         kern_linear_pte_xor[0] = _PAGE_VALID ^ PAGE_OFFSET;
2722 #else
2723         kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4U) ^
2724                 PAGE_OFFSET;
2725 #endif
2726         kern_linear_pte_xor[0] |= (_PAGE_CP_4U | _PAGE_CV_4U |
2727                                    _PAGE_P_4U | _PAGE_W_4U);
2728
2729         for (i = 1; i < 4; i++)
2730                 kern_linear_pte_xor[i] = kern_linear_pte_xor[0];
2731
2732         _PAGE_ALL_SZ_BITS =  (_PAGE_SZ4MB_4U | _PAGE_SZ512K_4U |
2733                               _PAGE_SZ64K_4U | _PAGE_SZ8K_4U |
2734                               _PAGE_SZ32MB_4U | _PAGE_SZ256MB_4U);
2735
2736
2737         page_none = _PAGE_PRESENT_4U | _PAGE_ACCESSED_4U | _PAGE_CACHE_4U;
2738         page_shared = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
2739                        __ACCESS_BITS_4U | _PAGE_WRITE_4U | _PAGE_EXEC_4U);
2740         page_copy   = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
2741                        __ACCESS_BITS_4U | _PAGE_EXEC_4U);
2742         page_readonly   = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
2743                            __ACCESS_BITS_4U | _PAGE_EXEC_4U);
2744
2745         page_exec_bit = _PAGE_EXEC_4U;
2746
2747         prot_init_common(page_none, page_shared, page_copy, page_readonly,
2748                          page_exec_bit);
2749 }
2750
2751 static void __init sun4v_pgprot_init(void)
2752 {
2753         unsigned long page_none, page_shared, page_copy, page_readonly;
2754         unsigned long page_exec_bit;
2755         int i;
2756
2757         PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4V | _PAGE_VALID |
2758                                 page_cache4v_flag | _PAGE_P_4V |
2759                                 __ACCESS_BITS_4V | __DIRTY_BITS_4V |
2760                                 _PAGE_EXEC_4V);
2761         PAGE_KERNEL_LOCKED = PAGE_KERNEL;
2762
2763         _PAGE_IE = _PAGE_IE_4V;
2764         _PAGE_E = _PAGE_E_4V;
2765         _PAGE_CACHE = page_cache4v_flag;
2766
2767 #ifdef CONFIG_DEBUG_PAGEALLOC
2768         kern_linear_pte_xor[0] = _PAGE_VALID ^ PAGE_OFFSET;
2769 #else
2770         kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4V) ^
2771                 PAGE_OFFSET;
2772 #endif
2773         kern_linear_pte_xor[0] |= (page_cache4v_flag | _PAGE_P_4V |
2774                                    _PAGE_W_4V);
2775
2776         for (i = 1; i < 4; i++)
2777                 kern_linear_pte_xor[i] = kern_linear_pte_xor[0];
2778
2779         pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4V | __DIRTY_BITS_4V |
2780                      __ACCESS_BITS_4V | _PAGE_E_4V);
2781
2782         _PAGE_ALL_SZ_BITS = (_PAGE_SZ16GB_4V | _PAGE_SZ2GB_4V |
2783                              _PAGE_SZ256MB_4V | _PAGE_SZ32MB_4V |
2784                              _PAGE_SZ4MB_4V | _PAGE_SZ512K_4V |
2785                              _PAGE_SZ64K_4V | _PAGE_SZ8K_4V);
2786
2787         page_none = _PAGE_PRESENT_4V | _PAGE_ACCESSED_4V | page_cache4v_flag;
2788         page_shared = (_PAGE_VALID | _PAGE_PRESENT_4V | page_cache4v_flag |
2789                        __ACCESS_BITS_4V | _PAGE_WRITE_4V | _PAGE_EXEC_4V);
2790         page_copy   = (_PAGE_VALID | _PAGE_PRESENT_4V | page_cache4v_flag |
2791                        __ACCESS_BITS_4V | _PAGE_EXEC_4V);
2792         page_readonly = (_PAGE_VALID | _PAGE_PRESENT_4V | page_cache4v_flag |
2793                          __ACCESS_BITS_4V | _PAGE_EXEC_4V);
2794
2795         page_exec_bit = _PAGE_EXEC_4V;
2796
2797         prot_init_common(page_none, page_shared, page_copy, page_readonly,
2798                          page_exec_bit);
2799 }
2800
2801 unsigned long pte_sz_bits(unsigned long sz)
2802 {
2803         if (tlb_type == hypervisor) {
2804                 switch (sz) {
2805                 case 8 * 1024:
2806                 default:
2807                         return _PAGE_SZ8K_4V;
2808                 case 64 * 1024:
2809                         return _PAGE_SZ64K_4V;
2810                 case 512 * 1024:
2811                         return _PAGE_SZ512K_4V;
2812                 case 4 * 1024 * 1024:
2813                         return _PAGE_SZ4MB_4V;
2814                 }
2815         } else {
2816                 switch (sz) {
2817                 case 8 * 1024:
2818                 default:
2819                         return _PAGE_SZ8K_4U;
2820                 case 64 * 1024:
2821                         return _PAGE_SZ64K_4U;
2822                 case 512 * 1024:
2823                         return _PAGE_SZ512K_4U;
2824                 case 4 * 1024 * 1024:
2825                         return _PAGE_SZ4MB_4U;
2826                 }
2827         }
2828 }
2829
2830 pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space, unsigned long page_size)
2831 {
2832         pte_t pte;
2833
2834         pte_val(pte)  = page | pgprot_val(pgprot_noncached(prot));
2835         pte_val(pte) |= (((unsigned long)space) << 32);
2836         pte_val(pte) |= pte_sz_bits(page_size);
2837
2838         return pte;
2839 }
2840
2841 static unsigned long kern_large_tte(unsigned long paddr)
2842 {
2843         unsigned long val;
2844
2845         val = (_PAGE_VALID | _PAGE_SZ4MB_4U |
2846                _PAGE_CP_4U | _PAGE_CV_4U | _PAGE_P_4U |
2847                _PAGE_EXEC_4U | _PAGE_L_4U | _PAGE_W_4U);
2848         if (tlb_type == hypervisor)
2849                 val = (_PAGE_VALID | _PAGE_SZ4MB_4V |
2850                        page_cache4v_flag | _PAGE_P_4V |
2851                        _PAGE_EXEC_4V | _PAGE_W_4V);
2852
2853         return val | paddr;
2854 }
2855
2856 /* If not locked, zap it. */
2857 void __flush_tlb_all(void)
2858 {
2859         unsigned long pstate;
2860         int i;
2861
2862         __asm__ __volatile__("flushw\n\t"
2863                              "rdpr      %%pstate, %0\n\t"
2864                              "wrpr      %0, %1, %%pstate"
2865                              : "=r" (pstate)
2866                              : "i" (PSTATE_IE));
2867         if (tlb_type == hypervisor) {
2868                 sun4v_mmu_demap_all();
2869         } else if (tlb_type == spitfire) {
2870                 for (i = 0; i < 64; i++) {
2871                         /* Spitfire Errata #32 workaround */
2872                         /* NOTE: Always runs on spitfire, so no
2873                          *       cheetah+ page size encodings.
2874                          */
2875                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
2876                                              "flush     %%g6"
2877                                              : /* No outputs */
2878                                              : "r" (0),
2879                                              "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
2880
2881                         if (!(spitfire_get_dtlb_data(i) & _PAGE_L_4U)) {
2882                                 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
2883                                                      "membar #Sync"
2884                                                      : /* no outputs */
2885                                                      : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
2886                                 spitfire_put_dtlb_data(i, 0x0UL);
2887                         }
2888
2889                         /* Spitfire Errata #32 workaround */
2890                         /* NOTE: Always runs on spitfire, so no
2891                          *       cheetah+ page size encodings.
2892                          */
2893                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
2894                                              "flush     %%g6"
2895                                              : /* No outputs */
2896                                              : "r" (0),
2897                                              "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
2898
2899                         if (!(spitfire_get_itlb_data(i) & _PAGE_L_4U)) {
2900                                 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
2901                                                      "membar #Sync"
2902                                                      : /* no outputs */
2903                                                      : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
2904                                 spitfire_put_itlb_data(i, 0x0UL);
2905                         }
2906                 }
2907         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
2908                 cheetah_flush_dtlb_all();
2909                 cheetah_flush_itlb_all();
2910         }
2911         __asm__ __volatile__("wrpr      %0, 0, %%pstate"
2912                              : : "r" (pstate));
2913 }
2914
2915 pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
2916 {
2917         struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2918         pte_t *pte = NULL;
2919
2920         if (page)
2921                 pte = (pte_t *) page_address(page);
2922
2923         return pte;
2924 }
2925
2926 pgtable_t pte_alloc_one(struct mm_struct *mm)
2927 {
2928         struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2929         if (!page)
2930                 return NULL;
2931         if (!pgtable_pte_page_ctor(page)) {
2932                 free_unref_page(page);
2933                 return NULL;
2934         }
2935         return (pte_t *) page_address(page);
2936 }
2937
2938 void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
2939 {
2940         free_page((unsigned long)pte);
2941 }
2942
2943 static void __pte_free(pgtable_t pte)
2944 {
2945         struct page *page = virt_to_page(pte);
2946
2947         pgtable_pte_page_dtor(page);
2948         __free_page(page);
2949 }
2950
2951 void pte_free(struct mm_struct *mm, pgtable_t pte)
2952 {
2953         __pte_free(pte);
2954 }
2955
2956 void pgtable_free(void *table, bool is_page)
2957 {
2958         if (is_page)
2959                 __pte_free(table);
2960         else
2961                 kmem_cache_free(pgtable_cache, table);
2962 }
2963
2964 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
2965 void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
2966                           pmd_t *pmd)
2967 {
2968         unsigned long pte, flags;
2969         struct mm_struct *mm;
2970         pmd_t entry = *pmd;
2971
2972         if (!pmd_large(entry) || !pmd_young(entry))
2973                 return;
2974
2975         pte = pmd_val(entry);
2976
2977         /* Don't insert a non-valid PMD into the TSB, we'll deadlock.  */
2978         if (!(pte & _PAGE_VALID))
2979                 return;
2980
2981         /* We are fabricating 8MB pages using 4MB real hw pages.  */
2982         pte |= (addr & (1UL << REAL_HPAGE_SHIFT));
2983
2984         mm = vma->vm_mm;
2985
2986         spin_lock_irqsave(&mm->context.lock, flags);
2987
2988         if (mm->context.tsb_block[MM_TSB_HUGE].tsb != NULL)
2989                 __update_mmu_tsb_insert(mm, MM_TSB_HUGE, REAL_HPAGE_SHIFT,
2990                                         addr, pte);
2991
2992         spin_unlock_irqrestore(&mm->context.lock, flags);
2993 }
2994 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
2995
2996 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
2997 static void context_reload(void *__data)
2998 {
2999         struct mm_struct *mm = __data;
3000
3001         if (mm == current->mm)
3002                 load_secondary_context(mm);
3003 }
3004
3005 void hugetlb_setup(struct pt_regs *regs)
3006 {
3007         struct mm_struct *mm = current->mm;
3008         struct tsb_config *tp;
3009
3010         if (faulthandler_disabled() || !mm) {
3011                 const struct exception_table_entry *entry;
3012
3013                 entry = search_exception_tables(regs->tpc);
3014                 if (entry) {
3015                         regs->tpc = entry->fixup;
3016                         regs->tnpc = regs->tpc + 4;
3017                         return;
3018                 }
3019                 pr_alert("Unexpected HugeTLB setup in atomic context.\n");
3020                 die_if_kernel("HugeTSB in atomic", regs);
3021         }
3022
3023         tp = &mm->context.tsb_block[MM_TSB_HUGE];
3024         if (likely(tp->tsb == NULL))
3025                 tsb_grow(mm, MM_TSB_HUGE, 0);
3026
3027         tsb_context_switch(mm);
3028         smp_tsb_sync(mm);
3029
3030         /* On UltraSPARC-III+ and later, configure the second half of
3031          * the Data-TLB for huge pages.
3032          */
3033         if (tlb_type == cheetah_plus) {
3034                 bool need_context_reload = false;
3035                 unsigned long ctx;
3036
3037                 spin_lock_irq(&ctx_alloc_lock);
3038                 ctx = mm->context.sparc64_ctx_val;
3039                 ctx &= ~CTX_PGSZ_MASK;
3040                 ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT;
3041                 ctx |= CTX_PGSZ_HUGE << CTX_PGSZ1_SHIFT;
3042
3043                 if (ctx != mm->context.sparc64_ctx_val) {
3044                         /* When changing the page size fields, we
3045                          * must perform a context flush so that no
3046                          * stale entries match.  This flush must
3047                          * occur with the original context register
3048                          * settings.
3049                          */
3050                         do_flush_tlb_mm(mm);
3051
3052                         /* Reload the context register of all processors
3053                          * also executing in this address space.
3054                          */
3055                         mm->context.sparc64_ctx_val = ctx;
3056                         need_context_reload = true;
3057                 }
3058                 spin_unlock_irq(&ctx_alloc_lock);
3059
3060                 if (need_context_reload)
3061                         on_each_cpu(context_reload, mm, 0);
3062         }
3063 }
3064 #endif
3065
3066 static struct resource code_resource = {
3067         .name   = "Kernel code",
3068         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
3069 };
3070
3071 static struct resource data_resource = {
3072         .name   = "Kernel data",
3073         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
3074 };
3075
3076 static struct resource bss_resource = {
3077         .name   = "Kernel bss",
3078         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
3079 };
3080
3081 static inline resource_size_t compute_kern_paddr(void *addr)
3082 {
3083         return (resource_size_t) (addr - KERNBASE + kern_base);
3084 }
3085
3086 static void __init kernel_lds_init(void)
3087 {
3088         code_resource.start = compute_kern_paddr(_text);
3089         code_resource.end   = compute_kern_paddr(_etext - 1);
3090         data_resource.start = compute_kern_paddr(_etext);
3091         data_resource.end   = compute_kern_paddr(_edata - 1);
3092         bss_resource.start  = compute_kern_paddr(__bss_start);
3093         bss_resource.end    = compute_kern_paddr(_end - 1);
3094 }
3095
3096 static int __init report_memory(void)
3097 {
3098         int i;
3099         struct resource *res;
3100
3101         kernel_lds_init();
3102
3103         for (i = 0; i < pavail_ents; i++) {
3104                 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
3105
3106                 if (!res) {
3107                         pr_warn("Failed to allocate source.\n");
3108                         break;
3109                 }
3110
3111                 res->name = "System RAM";
3112                 res->start = pavail[i].phys_addr;
3113                 res->end = pavail[i].phys_addr + pavail[i].reg_size - 1;
3114                 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
3115
3116                 if (insert_resource(&iomem_resource, res) < 0) {
3117                         pr_warn("Resource insertion failed.\n");
3118                         break;
3119                 }
3120
3121                 insert_resource(res, &code_resource);
3122                 insert_resource(res, &data_resource);
3123                 insert_resource(res, &bss_resource);
3124         }
3125
3126         return 0;
3127 }
3128 arch_initcall(report_memory);
3129
3130 #ifdef CONFIG_SMP
3131 #define do_flush_tlb_kernel_range       smp_flush_tlb_kernel_range
3132 #else
3133 #define do_flush_tlb_kernel_range       __flush_tlb_kernel_range
3134 #endif
3135
3136 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
3137 {
3138         if (start < HI_OBP_ADDRESS && end > LOW_OBP_ADDRESS) {
3139                 if (start < LOW_OBP_ADDRESS) {
3140                         flush_tsb_kernel_range(start, LOW_OBP_ADDRESS);
3141                         do_flush_tlb_kernel_range(start, LOW_OBP_ADDRESS);
3142                 }
3143                 if (end > HI_OBP_ADDRESS) {
3144                         flush_tsb_kernel_range(HI_OBP_ADDRESS, end);
3145                         do_flush_tlb_kernel_range(HI_OBP_ADDRESS, end);
3146                 }
3147         } else {
3148                 flush_tsb_kernel_range(start, end);
3149                 do_flush_tlb_kernel_range(start, end);
3150         }
3151 }
3152
3153 void copy_user_highpage(struct page *to, struct page *from,
3154         unsigned long vaddr, struct vm_area_struct *vma)
3155 {
3156         char *vfrom, *vto;
3157
3158         vfrom = kmap_atomic(from);
3159         vto = kmap_atomic(to);
3160         copy_user_page(vto, vfrom, vaddr, to);
3161         kunmap_atomic(vto);
3162         kunmap_atomic(vfrom);
3163
3164         /* If this page has ADI enabled, copy over any ADI tags
3165          * as well
3166          */
3167         if (vma->vm_flags & VM_SPARC_ADI) {
3168                 unsigned long pfrom, pto, i, adi_tag;
3169
3170                 pfrom = page_to_phys(from);
3171                 pto = page_to_phys(to);
3172
3173                 for (i = pfrom; i < (pfrom + PAGE_SIZE); i += adi_blksize()) {
3174                         asm volatile("ldxa [%1] %2, %0\n\t"
3175                                         : "=r" (adi_tag)
3176                                         :  "r" (i), "i" (ASI_MCD_REAL));
3177                         asm volatile("stxa %0, [%1] %2\n\t"
3178                                         :
3179                                         : "r" (adi_tag), "r" (pto),
3180                                           "i" (ASI_MCD_REAL));
3181                         pto += adi_blksize();
3182                 }
3183                 asm volatile("membar #Sync\n\t");
3184         }
3185 }
3186 EXPORT_SYMBOL(copy_user_highpage);
3187
3188 void copy_highpage(struct page *to, struct page *from)
3189 {
3190         char *vfrom, *vto;
3191
3192         vfrom = kmap_atomic(from);
3193         vto = kmap_atomic(to);
3194         copy_page(vto, vfrom);
3195         kunmap_atomic(vto);
3196         kunmap_atomic(vfrom);
3197
3198         /* If this platform is ADI enabled, copy any ADI tags
3199          * as well
3200          */
3201         if (adi_capable()) {
3202                 unsigned long pfrom, pto, i, adi_tag;
3203
3204                 pfrom = page_to_phys(from);
3205                 pto = page_to_phys(to);
3206
3207                 for (i = pfrom; i < (pfrom + PAGE_SIZE); i += adi_blksize()) {
3208                         asm volatile("ldxa [%1] %2, %0\n\t"
3209                                         : "=r" (adi_tag)
3210                                         :  "r" (i), "i" (ASI_MCD_REAL));
3211                         asm volatile("stxa %0, [%1] %2\n\t"
3212                                         :
3213                                         : "r" (adi_tag), "r" (pto),
3214                                           "i" (ASI_MCD_REAL));
3215                         pto += adi_blksize();
3216                 }
3217                 asm volatile("membar #Sync\n\t");
3218         }
3219 }
3220 EXPORT_SYMBOL(copy_highpage);