arch/sparc64/mm/init.c

   1 /*
   2  *  arch/sparc64/mm/init.c
   3  *
   4  *  Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu)
   5  *  Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <linux/string.h>
  12 #include <linux/init.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/mm.h>
  15 #include <linux/hugetlb.h>
  16 #include <linux/slab.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/percpu.h>
  27 #include <linux/lmb.h>
  28 #include <linux/mmzone.h>
  29
  30 #include <asm/head.h>
  31 #include <asm/system.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 <asm/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/sstate.h>
  50 #include <asm/mdesc.h>
  51 #include <asm/cpudata.h>
  52
  53 #define MAX_PHYS_ADDRESS        (1UL << 42UL)
  54 #define KPTE_BITMAP_CHUNK_SZ    (256UL * 1024UL * 1024UL)
  55 #define KPTE_BITMAP_BYTES       \
  56         ((MAX_PHYS_ADDRESS / KPTE_BITMAP_CHUNK_SZ) / 8)
  57
  58 unsigned long kern_linear_pte_xor[2] __read_mostly;
  59
  60 /* A bitmap, one bit for every 256MB of physical memory.  If the bit
  61  * is clear, we should use a 4MB page (via kern_linear_pte_xor[0]) else
  62  * if set we should use a 256MB page (via kern_linear_pte_xor[1]).
  63  */
  64 unsigned long kpte_linear_bitmap[KPTE_BITMAP_BYTES / sizeof(unsigned long)];
  65
  66 #ifndef CONFIG_DEBUG_PAGEALLOC
  67 /* A special kernel TSB for 4MB and 256MB linear mappings.
  68  * Space is allocated for this right after the trap table
  69  * in arch/sparc64/kernel/head.S
  70  */
  71 extern struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
  72 #endif
  73
  74 #define MAX_BANKS       32
  75
  76 static struct linux_prom64_registers pavail[MAX_BANKS] __initdata;
  77 static int pavail_ents __initdata;
  78
  79 static int cmp_p64(const void *a, const void *b)
  80 {
  81         const struct linux_prom64_registers *x = a, *y = b;
  82
  83         if (x->phys_addr > y->phys_addr)
  84                 return 1;
  85         if (x->phys_addr < y->phys_addr)
  86                 return -1;
  87         return 0;
  88 }
  89
  90 static void __init read_obp_memory(const char *property,
  91                                    struct linux_prom64_registers *regs,
  92                                    int *num_ents)
  93 {
  94         int node = prom_finddevice("/memory");
  95         int prop_size = prom_getproplen(node, property);
  96         int ents, ret, i;
  97
  98         ents = prop_size / sizeof(struct linux_prom64_registers);
  99         if (ents > MAX_BANKS) {
 100                 prom_printf("The machine has more %s property entries than "
 101                             "this kernel can support (%d).\n",
 102                             property, MAX_BANKS);
 103                 prom_halt();
 104         }
 105
 106         ret = prom_getproperty(node, property, (char *) regs, prop_size);
 107         if (ret == -1) {
 108                 prom_printf("Couldn't get %s property from /memory.\n");
 109                 prom_halt();
 110         }
 111
 112         /* Sanitize what we got from the firmware, by page aligning
 113          * everything.
 114          */
 115         for (i = 0; i < ents; i++) {
 116                 unsigned long base, size;
 117
 118                 base = regs[i].phys_addr;
 119                 size = regs[i].reg_size;
 120
 121                 size &= PAGE_MASK;
 122                 if (base & ~PAGE_MASK) {
 123                         unsigned long new_base = PAGE_ALIGN(base);
 124
 125                         size -= new_base - base;
 126                         if ((long) size < 0L)
 127                                 size = 0UL;
 128                         base = new_base;
 129                 }
 130                 if (size == 0UL) {
 131                         /* If it is empty, simply get rid of it.
 132                          * This simplifies the logic of the other
 133                          * functions that process these arrays.
 134                          */
 135                         memmove(&regs[i], &regs[i + 1],
 136                                 (ents - i - 1) * sizeof(regs[0]));
 137                         i--;
 138                         ents--;
 139                         continue;
 140                 }
 141                 regs[i].phys_addr = base;
 142                 regs[i].reg_size = size;
 143         }
 144
 145         *num_ents = ents;
 146
 147         sort(regs, ents, sizeof(struct linux_prom64_registers),
 148              cmp_p64, NULL);
 149 }
 150
 151 unsigned long *sparc64_valid_addr_bitmap __read_mostly;
 152
 153 /* Kernel physical address base and size in bytes.  */
 154 unsigned long kern_base __read_mostly;
 155 unsigned long kern_size __read_mostly;
 156
 157 /* Initial ramdisk setup */
 158 extern unsigned long sparc_ramdisk_image64;
 159 extern unsigned int sparc_ramdisk_image;
 160 extern unsigned int sparc_ramdisk_size;
 161
 162 struct page *mem_map_zero __read_mostly;
 163 EXPORT_SYMBOL(mem_map_zero);
 164
 165 unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly;
 166
 167 unsigned long sparc64_kern_pri_context __read_mostly;
 168 unsigned long sparc64_kern_pri_nuc_bits __read_mostly;
 169 unsigned long sparc64_kern_sec_context __read_mostly;
 170
 171 int num_kernel_image_mappings;
 172
 173 #ifdef CONFIG_DEBUG_DCFLUSH
 174 atomic_t dcpage_flushes = ATOMIC_INIT(0);
 175 #ifdef CONFIG_SMP
 176 atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
 177 #endif
 178 #endif
 179
 180 inline void flush_dcache_page_impl(struct page *page)
 181 {
 182         BUG_ON(tlb_type == hypervisor);
 183 #ifdef CONFIG_DEBUG_DCFLUSH
 184         atomic_inc(&dcpage_flushes);
 185 #endif
 186
 187 #ifdef DCACHE_ALIASING_POSSIBLE
 188         __flush_dcache_page(page_address(page),
 189                             ((tlb_type == spitfire) &&
 190                              page_mapping(page) != NULL));
 191 #else
 192         if (page_mapping(page) != NULL &&
 193             tlb_type == spitfire)
 194                 __flush_icache_page(__pa(page_address(page)));
 195 #endif
 196 }
 197
 198 #define PG_dcache_dirty         PG_arch_1
 199 #define PG_dcache_cpu_shift     32UL
 200 #define PG_dcache_cpu_mask      \
 201         ((1UL<<ilog2(roundup_pow_of_two(NR_CPUS)))-1UL)
 202
 203 #define dcache_dirty_cpu(page) \
 204         (((page)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
 205
 206 static inline void set_dcache_dirty(struct page *page, int this_cpu)
 207 {
 208         unsigned long mask = this_cpu;
 209         unsigned long non_cpu_bits;
 210
 211         non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift);
 212         mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty);
 213
 214         __asm__ __volatile__("1:\n\t"
 215                              "ldx       [%2], %%g7\n\t"
 216                              "and       %%g7, %1, %%g1\n\t"
 217                              "or        %%g1, %0, %%g1\n\t"
 218                              "casx      [%2], %%g7, %%g1\n\t"
 219                              "cmp       %%g7, %%g1\n\t"
 220                              "membar    #StoreLoad | #StoreStore\n\t"
 221                              "bne,pn    %%xcc, 1b\n\t"
 222                              " nop"
 223                              : /* no outputs */
 224                              : "r" (mask), "r" (non_cpu_bits), "r" (&page->flags)
 225                              : "g1", "g7");
 226 }
 227
 228 static inline void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
 229 {
 230         unsigned long mask = (1UL << PG_dcache_dirty);
 231
 232         __asm__ __volatile__("! test_and_clear_dcache_dirty\n"
 233                              "1:\n\t"
 234                              "ldx       [%2], %%g7\n\t"
 235                              "srlx      %%g7, %4, %%g1\n\t"
 236                              "and       %%g1, %3, %%g1\n\t"
 237                              "cmp       %%g1, %0\n\t"
 238                              "bne,pn    %%icc, 2f\n\t"
 239                              " andn     %%g7, %1, %%g1\n\t"
 240                              "casx      [%2], %%g7, %%g1\n\t"
 241                              "cmp       %%g7, %%g1\n\t"
 242                              "membar    #StoreLoad | #StoreStore\n\t"
 243                              "bne,pn    %%xcc, 1b\n\t"
 244                              " nop\n"
 245                              "2:"
 246                              : /* no outputs */
 247                              : "r" (cpu), "r" (mask), "r" (&page->flags),
 248                                "i" (PG_dcache_cpu_mask),
 249                                "i" (PG_dcache_cpu_shift)
 250                              : "g1", "g7");
 251 }
 252
 253 static inline void tsb_insert(struct tsb *ent, unsigned long tag, unsigned long pte)
 254 {
 255         unsigned long tsb_addr = (unsigned long) ent;
 256
 257         if (tlb_type == cheetah_plus || tlb_type == hypervisor)
 258                 tsb_addr = __pa(tsb_addr);
 259
 260         __tsb_insert(tsb_addr, tag, pte);
 261 }
 262
 263 unsigned long _PAGE_ALL_SZ_BITS __read_mostly;
 264 unsigned long _PAGE_SZBITS __read_mostly;
 265
 266 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
 267 {
 268         struct mm_struct *mm;
 269         struct tsb *tsb;
 270         unsigned long tag, flags;
 271         unsigned long tsb_index, tsb_hash_shift;
 272
 273         if (tlb_type != hypervisor) {
 274                 unsigned long pfn = pte_pfn(pte);
 275                 unsigned long pg_flags;
 276                 struct page *page;
 277
 278                 if (pfn_valid(pfn) &&
 279                     (page = pfn_to_page(pfn), page_mapping(page)) &&
 280                     ((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
 281                         int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
 282                                    PG_dcache_cpu_mask);
 283                         int this_cpu = get_cpu();
 284
 285                         /* This is just to optimize away some function calls
 286                          * in the SMP case.
 287                          */
 288                         if (cpu == this_cpu)
 289                                 flush_dcache_page_impl(page);
 290                         else
 291                                 smp_flush_dcache_page_impl(page, cpu);
 292
 293                         clear_dcache_dirty_cpu(page, cpu);
 294
 295                         put_cpu();
 296                 }
 297         }
 298
 299         mm = vma->vm_mm;
 300
 301         tsb_index = MM_TSB_BASE;
 302         tsb_hash_shift = PAGE_SHIFT;
 303
 304         spin_lock_irqsave(&mm->context.lock, flags);
 305
 306 #ifdef CONFIG_HUGETLB_PAGE
 307         if (mm->context.tsb_block[MM_TSB_HUGE].tsb != NULL) {
 308                 if ((tlb_type == hypervisor &&
 309                      (pte_val(pte) & _PAGE_SZALL_4V) == _PAGE_SZHUGE_4V) ||
 310                     (tlb_type != hypervisor &&
 311                      (pte_val(pte) & _PAGE_SZALL_4U) == _PAGE_SZHUGE_4U)) {
 312                         tsb_index = MM_TSB_HUGE;
 313                         tsb_hash_shift = HPAGE_SHIFT;
 314                 }
 315         }
 316 #endif
 317
 318         tsb = mm->context.tsb_block[tsb_index].tsb;
 319         tsb += ((address >> tsb_hash_shift) &
 320                 (mm->context.tsb_block[tsb_index].tsb_nentries - 1UL));
 321         tag = (address >> 22UL);
 322         tsb_insert(tsb, tag, pte_val(pte));
 323
 324         spin_unlock_irqrestore(&mm->context.lock, flags);
 325 }
 326
 327 void flush_dcache_page(struct page *page)
 328 {
 329         struct address_space *mapping;
 330         int this_cpu;
 331
 332         if (tlb_type == hypervisor)
 333                 return;
 334
 335         /* Do not bother with the expensive D-cache flush if it
 336          * is merely the zero page.  The 'bigcore' testcase in GDB
 337          * causes this case to run millions of times.
 338          */
 339         if (page == ZERO_PAGE(0))
 340                 return;
 341
 342         this_cpu = get_cpu();
 343
 344         mapping = page_mapping(page);
 345         if (mapping && !mapping_mapped(mapping)) {
 346                 int dirty = test_bit(PG_dcache_dirty, &page->flags);
 347                 if (dirty) {
 348                         int dirty_cpu = dcache_dirty_cpu(page);
 349
 350                         if (dirty_cpu == this_cpu)
 351                                 goto out;
 352                         smp_flush_dcache_page_impl(page, dirty_cpu);
 353                 }
 354                 set_dcache_dirty(page, this_cpu);
 355         } else {
 356                 /* We could delay the flush for the !page_mapping
 357                  * case too.  But that case is for exec env/arg
 358                  * pages and those are %99 certainly going to get
 359                  * faulted into the tlb (and thus flushed) anyways.
 360                  */
 361                 flush_dcache_page_impl(page);
 362         }
 363
 364 out:
 365         put_cpu();
 366 }
 367
 368 void __kprobes flush_icache_range(unsigned long start, unsigned long end)
 369 {
 370         /* Cheetah and Hypervisor platform cpus have coherent I-cache. */
 371         if (tlb_type == spitfire) {
 372                 unsigned long kaddr;
 373
 374                 /* This code only runs on Spitfire cpus so this is
 375                  * why we can assume _PAGE_PADDR_4U.
 376                  */
 377                 for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE) {
 378                         unsigned long paddr, mask = _PAGE_PADDR_4U;
 379
 380                         if (kaddr >= PAGE_OFFSET)
 381                                 paddr = kaddr & mask;
 382                         else {
 383                                 pgd_t *pgdp = pgd_offset_k(kaddr);
 384                                 pud_t *pudp = pud_offset(pgdp, kaddr);
 385                                 pmd_t *pmdp = pmd_offset(pudp, kaddr);
 386                                 pte_t *ptep = pte_offset_kernel(pmdp, kaddr);
 387
 388                                 paddr = pte_val(*ptep) & mask;
 389                         }
 390                         __flush_icache_page(paddr);
 391                 }
 392         }
 393 }
 394
 395 void show_mem(void)
 396 {
 397         unsigned long total = 0, reserved = 0;
 398         unsigned long shared = 0, cached = 0;
 399         pg_data_t *pgdat;
 400
 401         printk(KERN_INFO "Mem-info:\n");
 402         show_free_areas();
 403         printk(KERN_INFO "Free swap:       %6ldkB\n",
 404                nr_swap_pages << (PAGE_SHIFT-10));
 405         for_each_online_pgdat(pgdat) {
 406                 unsigned long i, flags;
 407
 408                 pgdat_resize_lock(pgdat, &flags);
 409                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 410                         struct page *page = pgdat_page_nr(pgdat, i);
 411                         total++;
 412                         if (PageReserved(page))
 413                                 reserved++;
 414                         else if (PageSwapCache(page))
 415                                 cached++;
 416                         else if (page_count(page))
 417                                 shared += page_count(page) - 1;
 418                 }
 419                 pgdat_resize_unlock(pgdat, &flags);
 420         }
 421
 422         printk(KERN_INFO "%lu pages of RAM\n", total);
 423         printk(KERN_INFO "%lu reserved pages\n", reserved);
 424         printk(KERN_INFO "%lu pages shared\n", shared);
 425         printk(KERN_INFO "%lu pages swap cached\n", cached);
 426
 427         printk(KERN_INFO "%lu pages dirty\n",
 428                global_page_state(NR_FILE_DIRTY));
 429         printk(KERN_INFO "%lu pages writeback\n",
 430                global_page_state(NR_WRITEBACK));
 431         printk(KERN_INFO "%lu pages mapped\n",
 432                global_page_state(NR_FILE_MAPPED));
 433         printk(KERN_INFO "%lu pages slab\n",
 434                 global_page_state(NR_SLAB_RECLAIMABLE) +
 435                 global_page_state(NR_SLAB_UNRECLAIMABLE));
 436         printk(KERN_INFO "%lu pages pagetables\n",
 437                global_page_state(NR_PAGETABLE));
 438 }
 439
 440 void mmu_info(struct seq_file *m)
 441 {
 442         if (tlb_type == cheetah)
 443                 seq_printf(m, "MMU Type\t: Cheetah\n");
 444         else if (tlb_type == cheetah_plus)
 445                 seq_printf(m, "MMU Type\t: Cheetah+\n");
 446         else if (tlb_type == spitfire)
 447                 seq_printf(m, "MMU Type\t: Spitfire\n");
 448         else if (tlb_type == hypervisor)
 449                 seq_printf(m, "MMU Type\t: Hypervisor (sun4v)\n");
 450         else
 451                 seq_printf(m, "MMU Type\t: ???\n");
 452
 453 #ifdef CONFIG_DEBUG_DCFLUSH
 454         seq_printf(m, "DCPageFlushes\t: %d\n",
 455                    atomic_read(&dcpage_flushes));
 456 #ifdef CONFIG_SMP
 457         seq_printf(m, "DCPageFlushesXC\t: %d\n",
 458                    atomic_read(&dcpage_flushes_xcall));
 459 #endif /* CONFIG_SMP */
 460 #endif /* CONFIG_DEBUG_DCFLUSH */
 461 }
 462
 463 struct linux_prom_translation {
 464         unsigned long virt;
 465         unsigned long size;
 466         unsigned long data;
 467 };
 468
 469 /* Exported for kernel TLB miss handling in ktlb.S */
 470 struct linux_prom_translation prom_trans[512] __read_mostly;
 471 unsigned int prom_trans_ents __read_mostly;
 472
 473 /* Exported for SMP bootup purposes. */
 474 unsigned long kern_locked_tte_data;
 475
 476 /* The obp translations are saved based on 8k pagesize, since obp can
 477  * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
 478  * HI_OBP_ADDRESS range are handled in ktlb.S.
 479  */
 480 static inline int in_obp_range(unsigned long vaddr)
 481 {
 482         return (vaddr >= LOW_OBP_ADDRESS &&
 483                 vaddr < HI_OBP_ADDRESS);
 484 }
 485
 486 static int cmp_ptrans(const void *a, const void *b)
 487 {
 488         const struct linux_prom_translation *x = a, *y = b;
 489
 490         if (x->virt > y->virt)
 491                 return 1;
 492         if (x->virt < y->virt)
 493                 return -1;
 494         return 0;
 495 }
 496
 497 /* Read OBP translations property into 'prom_trans[]'.  */
 498 static void __init read_obp_translations(void)
 499 {
 500         int n, node, ents, first, last, i;
 501
 502         node = prom_finddevice("/virtual-memory");
 503         n = prom_getproplen(node, "translations");
 504         if (unlikely(n == 0 || n == -1)) {
 505                 prom_printf("prom_mappings: Couldn't get size.\n");
 506                 prom_halt();
 507         }
 508         if (unlikely(n > sizeof(prom_trans))) {
 509                 prom_printf("prom_mappings: Size %Zd is too big.\n", n);
 510                 prom_halt();
 511         }
 512
 513         if ((n = prom_getproperty(node, "translations",
 514                                   (char *)&prom_trans[0],
 515                                   sizeof(prom_trans))) == -1) {
 516                 prom_printf("prom_mappings: Couldn't get property.\n");
 517                 prom_halt();
 518         }
 519
 520         n = n / sizeof(struct linux_prom_translation);
 521
 522         ents = n;
 523
 524         sort(prom_trans, ents, sizeof(struct linux_prom_translation),
 525              cmp_ptrans, NULL);
 526
 527         /* Now kick out all the non-OBP entries.  */
 528         for (i = 0; i < ents; i++) {
 529                 if (in_obp_range(prom_trans[i].virt))
 530                         break;
 531         }
 532         first = i;
 533         for (; i < ents; i++) {
 534                 if (!in_obp_range(prom_trans[i].virt))
 535                         break;
 536         }
 537         last = i;
 538
 539         for (i = 0; i < (last - first); i++) {
 540                 struct linux_prom_translation *src = &prom_trans[i + first];
 541                 struct linux_prom_translation *dest = &prom_trans[i];
 542
 543                 *dest = *src;
 544         }
 545         for (; i < ents; i++) {
 546                 struct linux_prom_translation *dest = &prom_trans[i];
 547                 dest->virt = dest->size = dest->data = 0x0UL;
 548         }
 549
 550         prom_trans_ents = last - first;
 551
 552         if (tlb_type == spitfire) {
 553                 /* Clear diag TTE bits. */
 554                 for (i = 0; i < prom_trans_ents; i++)
 555                         prom_trans[i].data &= ~0x0003fe0000000000UL;
 556         }
 557 }
 558
 559 static void __init hypervisor_tlb_lock(unsigned long vaddr,
 560                                        unsigned long pte,
 561                                        unsigned long mmu)
 562 {
 563         unsigned long ret = sun4v_mmu_map_perm_addr(vaddr, 0, pte, mmu);
 564
 565         if (ret != 0) {
 566                 prom_printf("hypervisor_tlb_lock[%lx:%lx:%lx:%lx]: "
 567                             "errors with %lx\n", vaddr, 0, pte, mmu, ret);
 568                 prom_halt();
 569         }
 570 }
 571
 572 static unsigned long kern_large_tte(unsigned long paddr);
 573
 574 static void __init remap_kernel(void)
 575 {
 576         unsigned long phys_page, tte_vaddr, tte_data;
 577         int i, tlb_ent = sparc64_highest_locked_tlbent();
 578
 579         tte_vaddr = (unsigned long) KERNBASE;
 580         phys_page = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
 581         tte_data = kern_large_tte(phys_page);
 582
 583         kern_locked_tte_data = tte_data;
 584
 585         /* Now lock us into the TLBs via Hypervisor or OBP. */
 586         if (tlb_type == hypervisor) {
 587                 for (i = 0; i < num_kernel_image_mappings; i++) {
 588                         hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_DMMU);
 589                         hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_IMMU);
 590                         tte_vaddr += 0x400000;
 591                         tte_data += 0x400000;
 592                 }
 593         } else {
 594                 for (i = 0; i < num_kernel_image_mappings; i++) {
 595                         prom_dtlb_load(tlb_ent - i, tte_data, tte_vaddr);
 596                         prom_itlb_load(tlb_ent - i, tte_data, tte_vaddr);
 597                         tte_vaddr += 0x400000;
 598                         tte_data += 0x400000;
 599                 }
 600                 sparc64_highest_unlocked_tlb_ent = tlb_ent - i;
 601         }
 602         if (tlb_type == cheetah_plus) {
 603                 sparc64_kern_pri_context = (CTX_CHEETAH_PLUS_CTX0 |
 604                                             CTX_CHEETAH_PLUS_NUC);
 605                 sparc64_kern_pri_nuc_bits = CTX_CHEETAH_PLUS_NUC;
 606                 sparc64_kern_sec_context = CTX_CHEETAH_PLUS_CTX0;
 607         }
 608 }
 609
 610
 611 static void __init inherit_prom_mappings(void)
 612 {
 613         /* Now fixup OBP's idea about where we really are mapped. */
 614         printk("Remapping the kernel... ");
 615         remap_kernel();
 616         printk("done.\n");
 617 }
 618
 619 void prom_world(int enter)
 620 {
 621         if (!enter)
 622                 set_fs((mm_segment_t) { get_thread_current_ds() });
 623
 624         __asm__ __volatile__("flushw");
 625 }
 626
 627 void __flush_dcache_range(unsigned long start, unsigned long end)
 628 {
 629         unsigned long va;
 630
 631         if (tlb_type == spitfire) {
 632                 int n = 0;
 633
 634                 for (va = start; va < end; va += 32) {
 635                         spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
 636                         if (++n >= 512)
 637                                 break;
 638                 }
 639         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 640                 start = __pa(start);
 641                 end = __pa(end);
 642                 for (va = start; va < end; va += 32)
 643                         __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
 644                                              "membar #Sync"
 645                                              : /* no outputs */
 646                                              : "r" (va),
 647                                                "i" (ASI_DCACHE_INVALIDATE));
 648         }
 649 }
 650
 651 /* get_new_mmu_context() uses "cache + 1".  */
 652 DEFINE_SPINLOCK(ctx_alloc_lock);
 653 unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
 654 #define MAX_CTX_NR      (1UL << CTX_NR_BITS)
 655 #define CTX_BMAP_SLOTS  BITS_TO_LONGS(MAX_CTX_NR)
 656 DECLARE_BITMAP(mmu_context_bmap, MAX_CTX_NR);
 657
 658 /* Caller does TLB context flushing on local CPU if necessary.
 659  * The caller also ensures that CTX_VALID(mm->context) is false.
 660  *
 661  * We must be careful about boundary cases so that we never
 662  * let the user have CTX 0 (nucleus) or we ever use a CTX
 663  * version of zero (and thus NO_CONTEXT would not be caught
 664  * by version mis-match tests in mmu_context.h).
 665  *
 666  * Always invoked with interrupts disabled.
 667  */
 668 void get_new_mmu_context(struct mm_struct *mm)
 669 {
 670         unsigned long ctx, new_ctx;
 671         unsigned long orig_pgsz_bits;
 672         unsigned long flags;
 673         int new_version;
 674
 675         spin_lock_irqsave(&ctx_alloc_lock, flags);
 676         orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
 677         ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
 678         new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
 679         new_version = 0;
 680         if (new_ctx >= (1 << CTX_NR_BITS)) {
 681                 new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1);
 682                 if (new_ctx >= ctx) {
 683                         int i;
 684                         new_ctx = (tlb_context_cache & CTX_VERSION_MASK) +
 685                                 CTX_FIRST_VERSION;
 686                         if (new_ctx == 1)
 687                                 new_ctx = CTX_FIRST_VERSION;
 688
 689                         /* Don't call memset, for 16 entries that's just
 690                          * plain silly...
 691                          */
 692                         mmu_context_bmap[0] = 3;
 693                         mmu_context_bmap[1] = 0;
 694                         mmu_context_bmap[2] = 0;
 695                         mmu_context_bmap[3] = 0;
 696                         for (i = 4; i < CTX_BMAP_SLOTS; i += 4) {
 697                                 mmu_context_bmap[i + 0] = 0;
 698                                 mmu_context_bmap[i + 1] = 0;
 699                                 mmu_context_bmap[i + 2] = 0;
 700                                 mmu_context_bmap[i + 3] = 0;
 701                         }
 702                         new_version = 1;
 703                         goto out;
 704                 }
 705         }
 706         mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63));
 707         new_ctx |= (tlb_context_cache & CTX_VERSION_MASK);
 708 out:
 709         tlb_context_cache = new_ctx;
 710         mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
 711         spin_unlock_irqrestore(&ctx_alloc_lock, flags);
 712
 713         if (unlikely(new_version))
 714                 smp_new_mmu_context_version();
 715 }
 716
 717 static int numa_enabled = 1;
 718 static int numa_debug;
 719
 720 static int __init early_numa(char *p)
 721 {
 722         if (!p)
 723                 return 0;
 724
 725         if (strstr(p, "off"))
 726                 numa_enabled = 0;
 727
 728         if (strstr(p, "debug"))
 729                 numa_debug = 1;
 730
 731         return 0;
 732 }
 733 early_param("numa", early_numa);
 734
 735 #define numadbg(f, a...) \
 736 do {    if (numa_debug) \
 737                 printk(KERN_INFO f, ## a); \
 738 } while (0)
 739
 740 static void __init find_ramdisk(unsigned long phys_base)
 741 {
 742 #ifdef CONFIG_BLK_DEV_INITRD
 743         if (sparc_ramdisk_image || sparc_ramdisk_image64) {
 744                 unsigned long ramdisk_image;
 745
 746                 /* Older versions of the bootloader only supported a
 747                  * 32-bit physical address for the ramdisk image
 748                  * location, stored at sparc_ramdisk_image.  Newer
 749                  * SILO versions set sparc_ramdisk_image to zero and
 750                  * provide a full 64-bit physical address at
 751                  * sparc_ramdisk_image64.
 752                  */
 753                 ramdisk_image = sparc_ramdisk_image;
 754                 if (!ramdisk_image)
 755                         ramdisk_image = sparc_ramdisk_image64;
 756
 757                 /* Another bootloader quirk.  The bootloader normalizes
 758                  * the physical address to KERNBASE, so we have to
 759                  * factor that back out and add in the lowest valid
 760                  * physical page address to get the true physical address.
 761                  */
 762                 ramdisk_image -= KERNBASE;
 763                 ramdisk_image += phys_base;
 764
 765                 numadbg("Found ramdisk at physical address 0x%lx, size %u\n",
 766                         ramdisk_image, sparc_ramdisk_size);
 767
 768                 initrd_start = ramdisk_image;
 769                 initrd_end = ramdisk_image + sparc_ramdisk_size;
 770
 771                 lmb_reserve(initrd_start, sparc_ramdisk_size);
 772
 773                 initrd_start += PAGE_OFFSET;
 774                 initrd_end += PAGE_OFFSET;
 775         }
 776 #endif
 777 }
 778
 779 struct node_mem_mask {
 780         unsigned long mask;
 781         unsigned long val;
 782         unsigned long bootmem_paddr;
 783 };
 784 static struct node_mem_mask node_masks[MAX_NUMNODES];
 785 static int num_node_masks;
 786
 787 int numa_cpu_lookup_table[NR_CPUS];
 788 cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES];
 789
 790 #ifdef CONFIG_NEED_MULTIPLE_NODES
 791
 792 struct mdesc_mblock {
 793         u64     base;
 794         u64     size;
 795         u64     offset; /* RA-to-PA */
 796 };
 797 static struct mdesc_mblock *mblocks;
 798 static int num_mblocks;
 799
 800 static unsigned long ra_to_pa(unsigned long addr)
 801 {
 802         int i;
 803
 804         for (i = 0; i < num_mblocks; i++) {
 805                 struct mdesc_mblock *m = &mblocks[i];
 806
 807                 if (addr >= m->base &&
 808                     addr < (m->base + m->size)) {
 809                         addr += m->offset;
 810                         break;
 811                 }
 812         }
 813         return addr;
 814 }
 815
 816 static int find_node(unsigned long addr)
 817 {
 818         int i;
 819
 820         addr = ra_to_pa(addr);
 821         for (i = 0; i < num_node_masks; i++) {
 822                 struct node_mem_mask *p = &node_masks[i];
 823
 824                 if ((addr & p->mask) == p->val)
 825                         return i;
 826         }
 827         return -1;
 828 }
 829
 830 static unsigned long nid_range(unsigned long start, unsigned long end,
 831                                int *nid)
 832 {
 833         *nid = find_node(start);
 834         start += PAGE_SIZE;
 835         while (start < end) {
 836                 int n = find_node(start);
 837
 838                 if (n != *nid)
 839                         break;
 840                 start += PAGE_SIZE;
 841         }
 842
 843         return start;
 844 }
 845 #else
 846 static unsigned long nid_range(unsigned long start, unsigned long end,
 847                                int *nid)
 848 {
 849         *nid = 0;
 850         return end;
 851 }
 852 #endif
 853
 854 /* This must be invoked after performing all of the necessary
 855  * add_active_range() calls for 'nid'.  We need to be able to get
 856  * correct data from get_pfn_range_for_nid().
 857  */
 858 static void __init allocate_node_data(int nid)
 859 {
 860         unsigned long paddr, num_pages, start_pfn, end_pfn;
 861         struct pglist_data *p;
 862
 863 #ifdef CONFIG_NEED_MULTIPLE_NODES
 864         paddr = lmb_alloc_nid(sizeof(struct pglist_data),
 865                               SMP_CACHE_BYTES, nid, nid_range);
 866         if (!paddr) {
 867                 prom_printf("Cannot allocate pglist_data for nid[%d]\n", nid);
 868                 prom_halt();
 869         }
 870         NODE_DATA(nid) = __va(paddr);
 871         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 872
 873         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
 874 #endif
 875
 876         p = NODE_DATA(nid);
 877
 878         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 879         p->node_start_pfn = start_pfn;
 880         p->node_spanned_pages = end_pfn - start_pfn;
 881
 882         if (p->node_spanned_pages) {
 883                 num_pages = bootmem_bootmap_pages(p->node_spanned_pages);
 884
 885                 paddr = lmb_alloc_nid(num_pages << PAGE_SHIFT, PAGE_SIZE, nid,
 886                                       nid_range);
 887                 if (!paddr) {
 888                         prom_printf("Cannot allocate bootmap for nid[%d]\n",
 889                                   nid);
 890                         prom_halt();
 891                 }
 892                 node_masks[nid].bootmem_paddr = paddr;
 893         }
 894 }
 895
 896 static void init_node_masks_nonnuma(void)
 897 {
 898         int i;
 899
 900         numadbg("Initializing tables for non-numa.\n");
 901
 902         node_masks[0].mask = node_masks[0].val = 0;
 903         num_node_masks = 1;
 904
 905         for (i = 0; i < NR_CPUS; i++)
 906                 numa_cpu_lookup_table[i] = 0;
 907
 908         numa_cpumask_lookup_table[0] = CPU_MASK_ALL;
 909 }
 910
 911 #ifdef CONFIG_NEED_MULTIPLE_NODES
 912 struct pglist_data *node_data[MAX_NUMNODES];
 913
 914 EXPORT_SYMBOL(numa_cpu_lookup_table);
 915 EXPORT_SYMBOL(numa_cpumask_lookup_table);
 916 EXPORT_SYMBOL(node_data);
 917
 918 struct mdesc_mlgroup {
 919         u64     node;
 920         u64     latency;
 921         u64     match;
 922         u64     mask;
 923 };
 924 static struct mdesc_mlgroup *mlgroups;
 925 static int num_mlgroups;
 926
 927 static int scan_pio_for_cfg_handle(struct mdesc_handle *md, u64 pio,
 928                                    u32 cfg_handle)
 929 {
 930         u64 arc;
 931
 932         mdesc_for_each_arc(arc, md, pio, MDESC_ARC_TYPE_FWD) {
 933                 u64 target = mdesc_arc_target(md, arc);
 934                 const u64 *val;
 935
 936                 val = mdesc_get_property(md, target,
 937                                          "cfg-handle", NULL);
 938                 if (val && *val == cfg_handle)
 939                         return 0;
 940         }
 941         return -ENODEV;
 942 }
 943
 944 static int scan_arcs_for_cfg_handle(struct mdesc_handle *md, u64 grp,
 945                                     u32 cfg_handle)
 946 {
 947         u64 arc, candidate, best_latency = ~(u64)0;
 948
 949         candidate = MDESC_NODE_NULL;
 950         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
 951                 u64 target = mdesc_arc_target(md, arc);
 952                 const char *name = mdesc_node_name(md, target);
 953                 const u64 *val;
 954
 955                 if (strcmp(name, "pio-latency-group"))
 956                         continue;
 957
 958                 val = mdesc_get_property(md, target, "latency", NULL);
 959                 if (!val)
 960                         continue;
 961
 962                 if (*val < best_latency) {
 963                         candidate = target;
 964                         best_latency = *val;
 965                 }
 966         }
 967
 968         if (candidate == MDESC_NODE_NULL)
 969                 return -ENODEV;
 970
 971         return scan_pio_for_cfg_handle(md, candidate, cfg_handle);
 972 }
 973
 974 int of_node_to_nid(struct device_node *dp)
 975 {
 976         const struct linux_prom64_registers *regs;
 977         struct mdesc_handle *md;
 978         u32 cfg_handle;
 979         int count, nid;
 980         u64 grp;
 981
 982         if (!mlgroups)
 983                 return -1;
 984
 985         regs = of_get_property(dp, "reg", NULL);
 986         if (!regs)
 987                 return -1;
 988
 989         cfg_handle = (regs->phys_addr >> 32UL) & 0x0fffffff;
 990
 991         md = mdesc_grab();
 992
 993         count = 0;
 994         nid = -1;
 995         mdesc_for_each_node_by_name(md, grp, "group") {
 996                 if (!scan_arcs_for_cfg_handle(md, grp, cfg_handle)) {
 997                         nid = count;
 998                         break;
 999                 }
1000                 count++;
1001         }
1002
1003         mdesc_release(md);
1004
1005         return nid;
1006 }
1007
1008 static void add_node_ranges(void)
1009 {
1010         int i;
1011
1012         for (i = 0; i < lmb.memory.cnt; i++) {
1013                 unsigned long size = lmb_size_bytes(&lmb.memory, i);
1014                 unsigned long start, end;
1015
1016                 start = lmb.memory.region[i].base;
1017                 end = start + size;
1018                 while (start < end) {
1019                         unsigned long this_end;
1020                         int nid;
1021
1022                         this_end = nid_range(start, end, &nid);
1023
1024                         numadbg("Adding active range nid[%d] "
1025                                 "start[%lx] end[%lx]\n",
1026                                 nid, start, this_end);
1027
1028                         add_active_range(nid,
1029                                          start >> PAGE_SHIFT,
1030                                          this_end >> PAGE_SHIFT);
1031
1032                         start = this_end;
1033                 }
1034         }
1035 }
1036
1037 static int __init grab_mlgroups(struct mdesc_handle *md)
1038 {
1039         unsigned long paddr;
1040         int count = 0;
1041         u64 node;
1042
1043         mdesc_for_each_node_by_name(md, node, "memory-latency-group")
1044                 count++;
1045         if (!count)
1046                 return -ENOENT;
1047
1048         paddr = lmb_alloc(count * sizeof(struct mdesc_mlgroup),
1049                           SMP_CACHE_BYTES);
1050         if (!paddr)
1051                 return -ENOMEM;
1052
1053         mlgroups = __va(paddr);
1054         num_mlgroups = count;
1055
1056         count = 0;
1057         mdesc_for_each_node_by_name(md, node, "memory-latency-group") {
1058                 struct mdesc_mlgroup *m = &mlgroups[count++];
1059                 const u64 *val;
1060
1061                 m->node = node;
1062
1063                 val = mdesc_get_property(md, node, "latency", NULL);
1064                 m->latency = *val;
1065                 val = mdesc_get_property(md, node, "address-match", NULL);
1066                 m->match = *val;
1067                 val = mdesc_get_property(md, node, "address-mask", NULL);
1068                 m->mask = *val;
1069
1070                 numadbg("MLGROUP[%d]: node[%lx] latency[%lx] "
1071                         "match[%lx] mask[%lx]\n",
1072                         count - 1, m->node, m->latency, m->match, m->mask);
1073         }
1074
1075         return 0;
1076 }
1077
1078 static int __init grab_mblocks(struct mdesc_handle *md)
1079 {
1080         unsigned long paddr;
1081         int count = 0;
1082         u64 node;
1083
1084         mdesc_for_each_node_by_name(md, node, "mblock")
1085                 count++;
1086         if (!count)
1087                 return -ENOENT;
1088
1089         paddr = lmb_alloc(count * sizeof(struct mdesc_mblock),
1090                           SMP_CACHE_BYTES);
1091         if (!paddr)
1092                 return -ENOMEM;
1093
1094         mblocks = __va(paddr);
1095         num_mblocks = count;
1096
1097         count = 0;
1098         mdesc_for_each_node_by_name(md, node, "mblock") {
1099                 struct mdesc_mblock *m = &mblocks[count++];
1100                 const u64 *val;
1101
1102                 val = mdesc_get_property(md, node, "base", NULL);
1103                 m->base = *val;
1104                 val = mdesc_get_property(md, node, "size", NULL);
1105                 m->size = *val;
1106                 val = mdesc_get_property(md, node,
1107                                          "address-congruence-offset", NULL);
1108                 m->offset = *val;
1109
1110                 numadbg("MBLOCK[%d]: base[%lx] size[%lx] offset[%lx]\n",
1111                         count - 1, m->base, m->size, m->offset);
1112         }
1113
1114         return 0;
1115 }
1116
1117 static void __init numa_parse_mdesc_group_cpus(struct mdesc_handle *md,
1118                                                u64 grp, cpumask_t *mask)
1119 {
1120         u64 arc;
1121
1122         cpus_clear(*mask);
1123
1124         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_BACK) {
1125                 u64 target = mdesc_arc_target(md, arc);
1126                 const char *name = mdesc_node_name(md, target);
1127                 const u64 *id;
1128
1129                 if (strcmp(name, "cpu"))
1130                         continue;
1131                 id = mdesc_get_property(md, target, "id", NULL);
1132                 if (*id < NR_CPUS)
1133                         cpu_set(*id, *mask);
1134         }
1135 }
1136
1137 static struct mdesc_mlgroup * __init find_mlgroup(u64 node)
1138 {
1139         int i;
1140
1141         for (i = 0; i < num_mlgroups; i++) {
1142                 struct mdesc_mlgroup *m = &mlgroups[i];
1143                 if (m->node == node)
1144                         return m;
1145         }
1146         return NULL;
1147 }
1148
1149 static int __init numa_attach_mlgroup(struct mdesc_handle *md, u64 grp,
1150                                       int index)
1151 {
1152         struct mdesc_mlgroup *candidate = NULL;
1153         u64 arc, best_latency = ~(u64)0;
1154         struct node_mem_mask *n;
1155
1156         mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
1157                 u64 target = mdesc_arc_target(md, arc);
1158                 struct mdesc_mlgroup *m = find_mlgroup(target);
1159                 if (!m)
1160                         continue;
1161                 if (m->latency < best_latency) {
1162                         candidate = m;
1163                         best_latency = m->latency;
1164                 }
1165         }
1166         if (!candidate)
1167                 return -ENOENT;
1168
1169         if (num_node_masks != index) {
1170                 printk(KERN_ERR "Inconsistent NUMA state, "
1171                        "index[%d] != num_node_masks[%d]\n",
1172                        index, num_node_masks);
1173                 return -EINVAL;
1174         }
1175
1176         n = &node_masks[num_node_masks++];
1177
1178         n->mask = candidate->mask;
1179         n->val = candidate->match;
1180
1181         numadbg("NUMA NODE[%d]: mask[%lx] val[%lx] (latency[%lx])\n",
1182                 index, n->mask, n->val, candidate->latency);
1183
1184         return 0;
1185 }
1186
1187 static int __init numa_parse_mdesc_group(struct mdesc_handle *md, u64 grp,
1188                                          int index)
1189 {
1190         cpumask_t mask;
1191         int cpu;
1192
1193         numa_parse_mdesc_group_cpus(md, grp, &mask);
1194
1195         for_each_cpu_mask(cpu, mask)
1196                 numa_cpu_lookup_table[cpu] = index;
1197         numa_cpumask_lookup_table[index] = mask;
1198
1199         if (numa_debug) {
1200                 printk(KERN_INFO "NUMA GROUP[%d]: cpus [ ", index);
1201                 for_each_cpu_mask(cpu, mask)
1202                         printk("%d ", cpu);
1203                 printk("]\n");
1204         }
1205
1206         return numa_attach_mlgroup(md, grp, index);
1207 }
1208
1209 static int __init numa_parse_mdesc(void)
1210 {
1211         struct mdesc_handle *md = mdesc_grab();
1212         int i, err, count;
1213         u64 node;
1214
1215         node = mdesc_node_by_name(md, MDESC_NODE_NULL, "latency-groups");
1216         if (node == MDESC_NODE_NULL) {
1217                 mdesc_release(md);
1218                 return -ENOENT;
1219         }
1220
1221         err = grab_mblocks(md);
1222         if (err < 0)
1223                 goto out;
1224
1225         err = grab_mlgroups(md);
1226         if (err < 0)
1227                 goto out;
1228
1229         count = 0;
1230         mdesc_for_each_node_by_name(md, node, "group") {
1231                 err = numa_parse_mdesc_group(md, node, count);
1232                 if (err < 0)
1233                         break;
1234                 count++;
1235         }
1236
1237         add_node_ranges();
1238
1239         for (i = 0; i < num_node_masks; i++) {
1240                 allocate_node_data(i);
1241                 node_set_online(i);
1242         }
1243
1244         err = 0;
1245 out:
1246         mdesc_release(md);
1247         return err;
1248 }
1249
1250 static int __init numa_parse_sun4u(void)
1251 {
1252         return -1;
1253 }
1254
1255 static int __init bootmem_init_numa(void)
1256 {
1257         int err = -1;
1258
1259         numadbg("bootmem_init_numa()\n");
1260
1261         if (numa_enabled) {
1262                 if (tlb_type == hypervisor)
1263                         err = numa_parse_mdesc();
1264                 else
1265                         err = numa_parse_sun4u();
1266         }
1267         return err;
1268 }
1269
1270 #else
1271
1272 static int bootmem_init_numa(void)
1273 {
1274         return -1;
1275 }
1276
1277 #endif
1278
1279 static void __init bootmem_init_nonnuma(void)
1280 {
1281         unsigned long top_of_ram = lmb_end_of_DRAM();
1282         unsigned long total_ram = lmb_phys_mem_size();
1283         unsigned int i;
1284
1285         numadbg("bootmem_init_nonnuma()\n");
1286
1287         printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
1288                top_of_ram, total_ram);
1289         printk(KERN_INFO "Memory hole size: %ldMB\n",
1290                (top_of_ram - total_ram) >> 20);
1291
1292         init_node_masks_nonnuma();
1293
1294         for (i = 0; i < lmb.memory.cnt; i++) {
1295                 unsigned long size = lmb_size_bytes(&lmb.memory, i);
1296                 unsigned long start_pfn, end_pfn;
1297
1298                 if (!size)
1299                         continue;
1300
1301                 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
1302                 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
1303                 add_active_range(0, start_pfn, end_pfn);
1304         }
1305
1306         allocate_node_data(0);
1307
1308         node_set_online(0);
1309 }
1310
1311 static void __init reserve_range_in_node(int nid, unsigned long start,
1312                                          unsigned long end)
1313 {
1314         numadbg("    reserve_range_in_node(nid[%d],start[%lx],end[%lx]\n",
1315                 nid, start, end);
1316         while (start < end) {
1317                 unsigned long this_end;
1318                 int n;
1319
1320                 this_end = nid_range(start, end, &n);
1321                 if (n == nid) {
1322                         numadbg("      MATCH reserving range [%lx:%lx]\n",
1323                                 start, this_end);
1324                         reserve_bootmem_node(NODE_DATA(nid), start,
1325                                              (this_end - start), BOOTMEM_DEFAULT);
1326                 } else
1327                         numadbg("      NO MATCH, advancing start to %lx\n",
1328                                 this_end);
1329
1330                 start = this_end;
1331         }
1332 }
1333
1334 static void __init trim_reserved_in_node(int nid)
1335 {
1336         int i;
1337
1338         numadbg("  trim_reserved_in_node(%d)\n", nid);
1339
1340         for (i = 0; i < lmb.reserved.cnt; i++) {
1341                 unsigned long start = lmb.reserved.region[i].base;
1342                 unsigned long size = lmb_size_bytes(&lmb.reserved, i);
1343                 unsigned long end = start + size;
1344
1345                 reserve_range_in_node(nid, start, end);
1346         }
1347 }
1348
1349 static void __init bootmem_init_one_node(int nid)
1350 {
1351         struct pglist_data *p;
1352
1353         numadbg("bootmem_init_one_node(%d)\n", nid);
1354
1355         p = NODE_DATA(nid);
1356
1357         if (p->node_spanned_pages) {
1358                 unsigned long paddr = node_masks[nid].bootmem_paddr;
1359                 unsigned long end_pfn;
1360
1361                 end_pfn = p->node_start_pfn + p->node_spanned_pages;
1362
1363                 numadbg("  init_bootmem_node(%d, %lx, %lx, %lx)\n",
1364                         nid, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
1365
1366                 init_bootmem_node(p, paddr >> PAGE_SHIFT,
1367                                   p->node_start_pfn, end_pfn);
1368
1369                 numadbg("  free_bootmem_with_active_regions(%d, %lx)\n",
1370                         nid, end_pfn);
1371                 free_bootmem_with_active_regions(nid, end_pfn);
1372
1373                 trim_reserved_in_node(nid);
1374
1375                 numadbg("  sparse_memory_present_with_active_regions(%d)\n",
1376                         nid);
1377                 sparse_memory_present_with_active_regions(nid);
1378         }
1379 }
1380
1381 static unsigned long __init bootmem_init(unsigned long phys_base)
1382 {
1383         unsigned long end_pfn;
1384         int nid;
1385
1386         end_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
1387         max_pfn = max_low_pfn = end_pfn;
1388         min_low_pfn = (phys_base >> PAGE_SHIFT);
1389
1390         if (bootmem_init_numa() < 0)
1391                 bootmem_init_nonnuma();
1392
1393         /* XXX cpu notifier XXX */
1394
1395         for_each_online_node(nid)
1396                 bootmem_init_one_node(nid);
1397
1398         sparse_init();
1399
1400         return end_pfn;
1401 }
1402
1403 static struct linux_prom64_registers pall[MAX_BANKS] __initdata;
1404 static int pall_ents __initdata;
1405
1406 #ifdef CONFIG_DEBUG_PAGEALLOC
1407 static unsigned long __ref kernel_map_range(unsigned long pstart,
1408                                             unsigned long pend, pgprot_t prot)
1409 {
1410         unsigned long vstart = PAGE_OFFSET + pstart;
1411         unsigned long vend = PAGE_OFFSET + pend;
1412         unsigned long alloc_bytes = 0UL;
1413
1414         if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
1415                 prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n",
1416                             vstart, vend);
1417                 prom_halt();
1418         }
1419
1420         while (vstart < vend) {
1421                 unsigned long this_end, paddr = __pa(vstart);
1422                 pgd_t *pgd = pgd_offset_k(vstart);
1423                 pud_t *pud;
1424                 pmd_t *pmd;
1425                 pte_t *pte;
1426
1427                 pud = pud_offset(pgd, vstart);
1428                 if (pud_none(*pud)) {
1429                         pmd_t *new;
1430
1431                         new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
1432                         alloc_bytes += PAGE_SIZE;
1433                         pud_populate(&init_mm, pud, new);
1434                 }
1435
1436                 pmd = pmd_offset(pud, vstart);
1437                 if (!pmd_present(*pmd)) {
1438                         pte_t *new;
1439
1440                         new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
1441                         alloc_bytes += PAGE_SIZE;
1442                         pmd_populate_kernel(&init_mm, pmd, new);
1443                 }
1444
1445                 pte = pte_offset_kernel(pmd, vstart);
1446                 this_end = (vstart + PMD_SIZE) & PMD_MASK;
1447                 if (this_end > vend)
1448                         this_end = vend;
1449
1450                 while (vstart < this_end) {
1451                         pte_val(*pte) = (paddr | pgprot_val(prot));
1452
1453                         vstart += PAGE_SIZE;
1454                         paddr += PAGE_SIZE;
1455                         pte++;
1456                 }
1457         }
1458
1459         return alloc_bytes;
1460 }
1461
1462 extern unsigned int kvmap_linear_patch[1];
1463 #endif /* CONFIG_DEBUG_PAGEALLOC */
1464
1465 static void __init mark_kpte_bitmap(unsigned long start, unsigned long end)
1466 {
1467         const unsigned long shift_256MB = 28;
1468         const unsigned long mask_256MB = ((1UL << shift_256MB) - 1UL);
1469         const unsigned long size_256MB = (1UL << shift_256MB);
1470
1471         while (start < end) {
1472                 long remains;
1473
1474                 remains = end - start;
1475                 if (remains < size_256MB)
1476                         break;
1477
1478                 if (start & mask_256MB) {
1479                         start = (start + size_256MB) & ~mask_256MB;
1480                         continue;
1481                 }
1482
1483                 while (remains >= size_256MB) {
1484                         unsigned long index = start >> shift_256MB;
1485
1486                         __set_bit(index, kpte_linear_bitmap);
1487
1488                         start += size_256MB;
1489                         remains -= size_256MB;
1490                 }
1491         }
1492 }
1493
1494 static void __init init_kpte_bitmap(void)
1495 {
1496         unsigned long i;
1497
1498         for (i = 0; i < pall_ents; i++) {
1499                 unsigned long phys_start, phys_end;
1500
1501                 phys_start = pall[i].phys_addr;
1502                 phys_end = phys_start + pall[i].reg_size;
1503
1504                 mark_kpte_bitmap(phys_start, phys_end);
1505         }
1506 }
1507
1508 static void __init kernel_physical_mapping_init(void)
1509 {
1510 #ifdef CONFIG_DEBUG_PAGEALLOC
1511         unsigned long i, mem_alloced = 0UL;
1512
1513         for (i = 0; i < pall_ents; i++) {
1514                 unsigned long phys_start, phys_end;
1515
1516                 phys_start = pall[i].phys_addr;
1517                 phys_end = phys_start + pall[i].reg_size;
1518
1519                 mem_alloced += kernel_map_range(phys_start, phys_end,
1520                                                 PAGE_KERNEL);
1521         }
1522
1523         printk("Allocated %ld bytes for kernel page tables.\n",
1524                mem_alloced);
1525
1526         kvmap_linear_patch[0] = 0x01000000; /* nop */
1527         flushi(&kvmap_linear_patch[0]);
1528
1529         __flush_tlb_all();
1530 #endif
1531 }
1532
1533 #ifdef CONFIG_DEBUG_PAGEALLOC
1534 void kernel_map_pages(struct page *page, int numpages, int enable)
1535 {
1536         unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
1537         unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
1538
1539         kernel_map_range(phys_start, phys_end,
1540                          (enable ? PAGE_KERNEL : __pgprot(0)));
1541
1542         flush_tsb_kernel_range(PAGE_OFFSET + phys_start,
1543                                PAGE_OFFSET + phys_end);
1544
1545         /* we should perform an IPI and flush all tlbs,
1546          * but that can deadlock->flush only current cpu.
1547          */
1548         __flush_tlb_kernel_range(PAGE_OFFSET + phys_start,
1549                                  PAGE_OFFSET + phys_end);
1550 }
1551 #endif
1552
1553 unsigned long __init find_ecache_flush_span(unsigned long size)
1554 {
1555         int i;
1556
1557         for (i = 0; i < pavail_ents; i++) {
1558                 if (pavail[i].reg_size >= size)
1559                         return pavail[i].phys_addr;
1560         }
1561
1562         return ~0UL;
1563 }
1564
1565 static void __init tsb_phys_patch(void)
1566 {
1567         struct tsb_ldquad_phys_patch_entry *pquad;
1568         struct tsb_phys_patch_entry *p;
1569
1570         pquad = &__tsb_ldquad_phys_patch;
1571         while (pquad < &__tsb_ldquad_phys_patch_end) {
1572                 unsigned long addr = pquad->addr;
1573
1574                 if (tlb_type == hypervisor)
1575                         *(unsigned int *) addr = pquad->sun4v_insn;
1576                 else
1577                         *(unsigned int *) addr = pquad->sun4u_insn;
1578                 wmb();
1579                 __asm__ __volatile__("flush     %0"
1580                                      : /* no outputs */
1581                                      : "r" (addr));
1582
1583                 pquad++;
1584         }
1585
1586         p = &__tsb_phys_patch;
1587         while (p < &__tsb_phys_patch_end) {
1588                 unsigned long addr = p->addr;
1589
1590                 *(unsigned int *) addr = p->insn;
1591                 wmb();
1592                 __asm__ __volatile__("flush     %0"
1593                                      : /* no outputs */
1594                                      : "r" (addr));
1595
1596                 p++;
1597         }
1598 }
1599
1600 /* Don't mark as init, we give this to the Hypervisor.  */
1601 #ifndef CONFIG_DEBUG_PAGEALLOC
1602 #define NUM_KTSB_DESCR  2
1603 #else
1604 #define NUM_KTSB_DESCR  1
1605 #endif
1606 static struct hv_tsb_descr ktsb_descr[NUM_KTSB_DESCR];
1607 extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
1608
1609 static void __init sun4v_ktsb_init(void)
1610 {
1611         unsigned long ktsb_pa;
1612
1613         /* First KTSB for PAGE_SIZE mappings.  */
1614         ktsb_pa = kern_base + ((unsigned long)&swapper_tsb[0] - KERNBASE);
1615
1616         switch (PAGE_SIZE) {
1617         case 8 * 1024:
1618         default:
1619                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_8K;
1620                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_8K;
1621                 break;
1622
1623         case 64 * 1024:
1624                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_64K;
1625                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_64K;
1626                 break;
1627
1628         case 512 * 1024:
1629                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_512K;
1630                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_512K;
1631                 break;
1632
1633         case 4 * 1024 * 1024:
1634                 ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_4MB;
1635                 ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_4MB;
1636                 break;
1637         };
1638
1639         ktsb_descr[0].assoc = 1;
1640         ktsb_descr[0].num_ttes = KERNEL_TSB_NENTRIES;
1641         ktsb_descr[0].ctx_idx = 0;
1642         ktsb_descr[0].tsb_base = ktsb_pa;
1643         ktsb_descr[0].resv = 0;
1644
1645 #ifndef CONFIG_DEBUG_PAGEALLOC
1646         /* Second KTSB for 4MB/256MB mappings.  */
1647         ktsb_pa = (kern_base +
1648                    ((unsigned long)&swapper_4m_tsb[0] - KERNBASE));
1649
1650         ktsb_descr[1].pgsz_idx = HV_PGSZ_IDX_4MB;
1651         ktsb_descr[1].pgsz_mask = (HV_PGSZ_MASK_4MB |
1652                                    HV_PGSZ_MASK_256MB);
1653         ktsb_descr[1].assoc = 1;
1654         ktsb_descr[1].num_ttes = KERNEL_TSB4M_NENTRIES;
1655         ktsb_descr[1].ctx_idx = 0;
1656         ktsb_descr[1].tsb_base = ktsb_pa;
1657         ktsb_descr[1].resv = 0;
1658 #endif
1659 }
1660
1661 void __cpuinit sun4v_ktsb_register(void)
1662 {
1663         unsigned long pa, ret;
1664
1665         pa = kern_base + ((unsigned long)&ktsb_descr[0] - KERNBASE);
1666
1667         ret = sun4v_mmu_tsb_ctx0(NUM_KTSB_DESCR, pa);
1668         if (ret != 0) {
1669                 prom_printf("hypervisor_mmu_tsb_ctx0[%lx]: "
1670                             "errors with %lx\n", pa, ret);
1671                 prom_halt();
1672         }
1673 }
1674
1675 /* paging_init() sets up the page tables */
1676
1677 extern void central_probe(void);
1678
1679 static unsigned long last_valid_pfn;
1680 pgd_t swapper_pg_dir[2048];
1681
1682 static void sun4u_pgprot_init(void);
1683 static void sun4v_pgprot_init(void);
1684
1685 /* Dummy function */
1686 void __init setup_per_cpu_areas(void)
1687 {
1688 }
1689
1690 void __init paging_init(void)
1691 {
1692         unsigned long end_pfn, shift, phys_base;
1693         unsigned long real_end, i;
1694
1695         /* These build time checkes make sure that the dcache_dirty_cpu()
1696          * page->flags usage will work.
1697          *
1698          * When a page gets marked as dcache-dirty, we store the
1699          * cpu number starting at bit 32 in the page->flags.  Also,
1700          * functions like clear_dcache_dirty_cpu use the cpu mask
1701          * in 13-bit signed-immediate instruction fields.
1702          */
1703
1704         /*
1705          * Page flags must not reach into upper 32 bits that are used
1706          * for the cpu number
1707          */
1708         BUILD_BUG_ON(NR_PAGEFLAGS > 32);
1709
1710         /*
1711          * The bit fields placed in the high range must not reach below
1712          * the 32 bit boundary. Otherwise we cannot place the cpu field
1713          * at the 32 bit boundary.
1714          */
1715         BUILD_BUG_ON(SECTIONS_WIDTH + NODES_WIDTH + ZONES_WIDTH +
1716                 ilog2(roundup_pow_of_two(NR_CPUS)) > 32);
1717
1718         BUILD_BUG_ON(NR_CPUS > 4096);
1719
1720         kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
1721         kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
1722
1723         sstate_booting();
1724
1725         /* Invalidate both kernel TSBs.  */
1726         memset(swapper_tsb, 0x40, sizeof(swapper_tsb));
1727 #ifndef CONFIG_DEBUG_PAGEALLOC
1728         memset(swapper_4m_tsb, 0x40, sizeof(swapper_4m_tsb));
1729 #endif
1730
1731         if (tlb_type == hypervisor)
1732                 sun4v_pgprot_init();
1733         else
1734                 sun4u_pgprot_init();
1735
1736         if (tlb_type == cheetah_plus ||
1737             tlb_type == hypervisor)
1738                 tsb_phys_patch();
1739
1740         if (tlb_type == hypervisor) {
1741                 sun4v_patch_tlb_handlers();
1742                 sun4v_ktsb_init();
1743         }
1744
1745         lmb_init();
1746
1747         /* Find available physical memory...
1748          *
1749          * Read it twice in order to work around a bug in openfirmware.
1750          * The call to grab this table itself can cause openfirmware to
1751          * allocate memory, which in turn can take away some space from
1752          * the list of available memory.  Reading it twice makes sure
1753          * we really do get the final value.
1754          */
1755         read_obp_translations();
1756         read_obp_memory("reg", &pall[0], &pall_ents);
1757         read_obp_memory("available", &pavail[0], &pavail_ents);
1758         read_obp_memory("available", &pavail[0], &pavail_ents);
1759
1760         phys_base = 0xffffffffffffffffUL;
1761         for (i = 0; i < pavail_ents; i++) {
1762                 phys_base = min(phys_base, pavail[i].phys_addr);
1763                 lmb_add(pavail[i].phys_addr, pavail[i].reg_size);
1764         }
1765
1766         lmb_reserve(kern_base, kern_size);
1767
1768         find_ramdisk(phys_base);
1769
1770         if (cmdline_memory_size)
1771                 lmb_enforce_memory_limit(phys_base + cmdline_memory_size);
1772
1773         lmb_analyze();
1774         lmb_dump_all();
1775
1776         set_bit(0, mmu_context_bmap);
1777
1778         shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);
1779
1780         real_end = (unsigned long)_end;
1781         num_kernel_image_mappings = DIV_ROUND_UP(real_end - KERNBASE, 1 << 22);
1782         printk("Kernel: Using %d locked TLB entries for main kernel image.\n",
1783                num_kernel_image_mappings);
1784
1785         /* Set kernel pgd to upper alias so physical page computations
1786          * work.
1787          */
1788         init_mm.pgd += ((shift) / (sizeof(pgd_t)));
1789
1790         memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir));
1791
1792         /* Now can init the kernel/bad page tables. */
1793         pud_set(pud_offset(&swapper_pg_dir[0], 0),
1794                 swapper_low_pmd_dir + (shift / sizeof(pgd_t)));
1795
1796         inherit_prom_mappings();
1797
1798         init_kpte_bitmap();
1799
1800         /* Ok, we can use our TLB miss and window trap handlers safely.  */
1801         setup_tba();
1802
1803         __flush_tlb_all();
1804
1805         if (tlb_type == hypervisor)
1806                 sun4v_ktsb_register();
1807
1808         /* We must setup the per-cpu areas before we pull in the
1809          * PROM and the MDESC.  The code there fills in cpu and
1810          * other information into per-cpu data structures.
1811          */
1812         real_setup_per_cpu_areas();
1813
1814         prom_build_devicetree();
1815
1816         if (tlb_type == hypervisor)
1817                 sun4v_mdesc_init();
1818
1819         /* Setup bootmem... */
1820         last_valid_pfn = end_pfn = bootmem_init(phys_base);
1821
1822 #ifndef CONFIG_NEED_MULTIPLE_NODES
1823         max_mapnr = last_valid_pfn;
1824 #endif
1825         kernel_physical_mapping_init();
1826
1827         {
1828                 unsigned long max_zone_pfns[MAX_NR_ZONES];
1829
1830                 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
1831
1832                 max_zone_pfns[ZONE_NORMAL] = end_pfn;
1833
1834                 free_area_init_nodes(max_zone_pfns);
1835         }
1836
1837         printk("Booting Linux...\n");
1838
1839         central_probe();
1840         cpu_probe();
1841 }
1842
1843 int __init page_in_phys_avail(unsigned long paddr)
1844 {
1845         int i;
1846
1847         paddr &= PAGE_MASK;
1848
1849         for (i = 0; i < pavail_ents; i++) {
1850                 unsigned long start, end;
1851
1852                 start = pavail[i].phys_addr;
1853                 end = start + pavail[i].reg_size;
1854
1855                 if (paddr >= start && paddr < end)
1856                         return 1;
1857         }
1858         if (paddr >= kern_base && paddr < (kern_base + kern_size))
1859                 return 1;
1860 #ifdef CONFIG_BLK_DEV_INITRD
1861         if (paddr >= __pa(initrd_start) &&
1862             paddr < __pa(PAGE_ALIGN(initrd_end)))
1863                 return 1;
1864 #endif
1865
1866         return 0;
1867 }
1868
1869 static struct linux_prom64_registers pavail_rescan[MAX_BANKS] __initdata;
1870 static int pavail_rescan_ents __initdata;
1871
1872 /* Certain OBP calls, such as fetching "available" properties, can
1873  * claim physical memory.  So, along with initializing the valid
1874  * address bitmap, what we do here is refetch the physical available
1875  * memory list again, and make sure it provides at least as much
1876  * memory as 'pavail' does.
1877  */
1878 static void setup_valid_addr_bitmap_from_pavail(void)
1879 {
1880         int i;
1881
1882         read_obp_memory("available", &pavail_rescan[0], &pavail_rescan_ents);
1883
1884         for (i = 0; i < pavail_ents; i++) {
1885                 unsigned long old_start, old_end;
1886
1887                 old_start = pavail[i].phys_addr;
1888                 old_end = old_start + pavail[i].reg_size;
1889                 while (old_start < old_end) {
1890                         int n;
1891
1892                         for (n = 0; n < pavail_rescan_ents; n++) {
1893                                 unsigned long new_start, new_end;
1894
1895                                 new_start = pavail_rescan[n].phys_addr;
1896                                 new_end = new_start +
1897                                         pavail_rescan[n].reg_size;
1898
1899                                 if (new_start <= old_start &&
1900                                     new_end >= (old_start + PAGE_SIZE)) {
1901                                         set_bit(old_start >> 22,
1902                                                 sparc64_valid_addr_bitmap);
1903                                         goto do_next_page;
1904                                 }
1905                         }
1906
1907                         prom_printf("mem_init: Lost memory in pavail\n");
1908                         prom_printf("mem_init: OLD start[%lx] size[%lx]\n",
1909                                     pavail[i].phys_addr,
1910                                     pavail[i].reg_size);
1911                         prom_printf("mem_init: NEW start[%lx] size[%lx]\n",
1912                                     pavail_rescan[i].phys_addr,
1913                                     pavail_rescan[i].reg_size);
1914                         prom_printf("mem_init: Cannot continue, aborting.\n");
1915                         prom_halt();
1916
1917                 do_next_page:
1918                         old_start += PAGE_SIZE;
1919                 }
1920         }
1921 }
1922
1923 void __init mem_init(void)
1924 {
1925         unsigned long codepages, datapages, initpages;
1926         unsigned long addr, last;
1927         int i;
1928
1929         i = last_valid_pfn >> ((22 - PAGE_SHIFT) + 6);
1930         i += 1;
1931         sparc64_valid_addr_bitmap = (unsigned long *) alloc_bootmem(i << 3);
1932         if (sparc64_valid_addr_bitmap == NULL) {
1933                 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
1934                 prom_halt();
1935         }
1936         memset(sparc64_valid_addr_bitmap, 0, i << 3);
1937
1938         addr = PAGE_OFFSET + kern_base;
1939         last = PAGE_ALIGN(kern_size) + addr;
1940         while (addr < last) {
1941                 set_bit(__pa(addr) >> 22, sparc64_valid_addr_bitmap);
1942                 addr += PAGE_SIZE;
1943         }
1944
1945         setup_valid_addr_bitmap_from_pavail();
1946
1947         high_memory = __va(last_valid_pfn << PAGE_SHIFT);
1948
1949 #ifdef CONFIG_NEED_MULTIPLE_NODES
1950         for_each_online_node(i) {
1951                 if (NODE_DATA(i)->node_spanned_pages != 0) {
1952                         totalram_pages +=
1953                                 free_all_bootmem_node(NODE_DATA(i));
1954                 }
1955         }
1956 #else
1957         totalram_pages = free_all_bootmem();
1958 #endif
1959
1960         /* We subtract one to account for the mem_map_zero page
1961          * allocated below.
1962          */
1963         totalram_pages -= 1;
1964         num_physpages = totalram_pages;
1965
1966         /*
1967          * Set up the zero page, mark it reserved, so that page count
1968          * is not manipulated when freeing the page from user ptes.
1969          */
1970         mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0);
1971         if (mem_map_zero == NULL) {
1972                 prom_printf("paging_init: Cannot alloc zero page.\n");
1973                 prom_halt();
1974         }
1975         SetPageReserved(mem_map_zero);
1976
1977         codepages = (((unsigned long) _etext) - ((unsigned long) _start));
1978         codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
1979         datapages = (((unsigned long) _edata) - ((unsigned long) _etext));
1980         datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
1981         initpages = (((unsigned long) __init_end) - ((unsigned long) __init_begin));
1982         initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
1983
1984         printk("Memory: %luk available (%ldk kernel code, %ldk data, %ldk init) [%016lx,%016lx]\n",
1985                nr_free_pages() << (PAGE_SHIFT-10),
1986                codepages << (PAGE_SHIFT-10),
1987                datapages << (PAGE_SHIFT-10),
1988                initpages << (PAGE_SHIFT-10),
1989                PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT));
1990
1991         if (tlb_type == cheetah || tlb_type == cheetah_plus)
1992                 cheetah_ecache_flush_init();
1993 }
1994
1995 void free_initmem(void)
1996 {
1997         unsigned long addr, initend;
1998
1999         /*
2000          * The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
2001          */
2002         addr = PAGE_ALIGN((unsigned long)(__init_begin));
2003         initend = (unsigned long)(__init_end) & PAGE_MASK;
2004         for (; addr < initend; addr += PAGE_SIZE) {
2005                 unsigned long page;
2006                 struct page *p;
2007
2008                 page = (addr +
2009                         ((unsigned long) __va(kern_base)) -
2010                         ((unsigned long) KERNBASE));
2011                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
2012                 p = virt_to_page(page);
2013
2014                 ClearPageReserved(p);
2015                 init_page_count(p);
2016                 __free_page(p);
2017                 num_physpages++;
2018                 totalram_pages++;
2019         }
2020 }
2021
2022 #ifdef CONFIG_BLK_DEV_INITRD
2023 void free_initrd_mem(unsigned long start, unsigned long end)
2024 {
2025         if (start < end)
2026                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
2027         for (; start < end; start += PAGE_SIZE) {
2028                 struct page *p = virt_to_page(start);
2029
2030                 ClearPageReserved(p);
2031                 init_page_count(p);
2032                 __free_page(p);
2033                 num_physpages++;
2034                 totalram_pages++;
2035         }
2036 }
2037 #endif
2038
2039 #define _PAGE_CACHE_4U  (_PAGE_CP_4U | _PAGE_CV_4U)
2040 #define _PAGE_CACHE_4V  (_PAGE_CP_4V | _PAGE_CV_4V)
2041 #define __DIRTY_BITS_4U  (_PAGE_MODIFIED_4U | _PAGE_WRITE_4U | _PAGE_W_4U)
2042 #define __DIRTY_BITS_4V  (_PAGE_MODIFIED_4V | _PAGE_WRITE_4V | _PAGE_W_4V)
2043 #define __ACCESS_BITS_4U (_PAGE_ACCESSED_4U | _PAGE_READ_4U | _PAGE_R)
2044 #define __ACCESS_BITS_4V (_PAGE_ACCESSED_4V | _PAGE_READ_4V | _PAGE_R)
2045
2046 pgprot_t PAGE_KERNEL __read_mostly;
2047 EXPORT_SYMBOL(PAGE_KERNEL);
2048
2049 pgprot_t PAGE_KERNEL_LOCKED __read_mostly;
2050 pgprot_t PAGE_COPY __read_mostly;
2051
2052 pgprot_t PAGE_SHARED __read_mostly;
2053 EXPORT_SYMBOL(PAGE_SHARED);
2054
2055 pgprot_t PAGE_EXEC __read_mostly;
2056 unsigned long pg_iobits __read_mostly;
2057
2058 unsigned long _PAGE_IE __read_mostly;
2059 EXPORT_SYMBOL(_PAGE_IE);
2060
2061 unsigned long _PAGE_E __read_mostly;
2062 EXPORT_SYMBOL(_PAGE_E);
2063
2064 unsigned long _PAGE_CACHE __read_mostly;
2065 EXPORT_SYMBOL(_PAGE_CACHE);
2066
2067 #ifdef CONFIG_SPARSEMEM_VMEMMAP
2068
2069 #define VMEMMAP_CHUNK_SHIFT     22
2070 #define VMEMMAP_CHUNK           (1UL << VMEMMAP_CHUNK_SHIFT)
2071 #define VMEMMAP_CHUNK_MASK      ~(VMEMMAP_CHUNK - 1UL)
2072 #define VMEMMAP_ALIGN(x)        (((x)+VMEMMAP_CHUNK-1UL)&VMEMMAP_CHUNK_MASK)
2073
2074 #define VMEMMAP_SIZE    ((((1UL << MAX_PHYSADDR_BITS) >> PAGE_SHIFT) * \
2075                           sizeof(struct page *)) >> VMEMMAP_CHUNK_SHIFT)
2076 unsigned long vmemmap_table[VMEMMAP_SIZE];
2077
2078 int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
2079 {
2080         unsigned long vstart = (unsigned long) start;
2081         unsigned long vend = (unsigned long) (start + nr);
2082         unsigned long phys_start = (vstart - VMEMMAP_BASE);
2083         unsigned long phys_end = (vend - VMEMMAP_BASE);
2084         unsigned long addr = phys_start & VMEMMAP_CHUNK_MASK;
2085         unsigned long end = VMEMMAP_ALIGN(phys_end);
2086         unsigned long pte_base;
2087
2088         pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4U |
2089                     _PAGE_CP_4U | _PAGE_CV_4U |
2090                     _PAGE_P_4U | _PAGE_W_4U);
2091         if (tlb_type == hypervisor)
2092                 pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4V |
2093                             _PAGE_CP_4V | _PAGE_CV_4V |
2094                             _PAGE_P_4V | _PAGE_W_4V);
2095
2096         for (; addr < end; addr += VMEMMAP_CHUNK) {
2097                 unsigned long *vmem_pp =
2098                         vmemmap_table + (addr >> VMEMMAP_CHUNK_SHIFT);
2099                 void *block;
2100
2101                 if (!(*vmem_pp & _PAGE_VALID)) {
2102                         block = vmemmap_alloc_block(1UL << 22, node);
2103                         if (!block)
2104                                 return -ENOMEM;
2105
2106                         *vmem_pp = pte_base | __pa(block);
2107
2108                         printk(KERN_INFO "[%p-%p] page_structs=%lu "
2109                                "node=%d entry=%lu/%lu\n", start, block, nr,
2110                                node,
2111                                addr >> VMEMMAP_CHUNK_SHIFT,
2112                                VMEMMAP_SIZE >> VMEMMAP_CHUNK_SHIFT);
2113                 }
2114         }
2115         return 0;
2116 }
2117 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
2118
2119 static void prot_init_common(unsigned long page_none,
2120                              unsigned long page_shared,
2121                              unsigned long page_copy,
2122                              unsigned long page_readonly,
2123                              unsigned long page_exec_bit)
2124 {
2125         PAGE_COPY = __pgprot(page_copy);
2126         PAGE_SHARED = __pgprot(page_shared);
2127
2128         protection_map[0x0] = __pgprot(page_none);
2129         protection_map[0x1] = __pgprot(page_readonly & ~page_exec_bit);
2130         protection_map[0x2] = __pgprot(page_copy & ~page_exec_bit);
2131         protection_map[0x3] = __pgprot(page_copy & ~page_exec_bit);
2132         protection_map[0x4] = __pgprot(page_readonly);
2133         protection_map[0x5] = __pgprot(page_readonly);
2134         protection_map[0x6] = __pgprot(page_copy);
2135         protection_map[0x7] = __pgprot(page_copy);
2136         protection_map[0x8] = __pgprot(page_none);
2137         protection_map[0x9] = __pgprot(page_readonly & ~page_exec_bit);
2138         protection_map[0xa] = __pgprot(page_shared & ~page_exec_bit);
2139         protection_map[0xb] = __pgprot(page_shared & ~page_exec_bit);
2140         protection_map[0xc] = __pgprot(page_readonly);
2141         protection_map[0xd] = __pgprot(page_readonly);
2142         protection_map[0xe] = __pgprot(page_shared);
2143         protection_map[0xf] = __pgprot(page_shared);
2144 }
2145
2146 static void __init sun4u_pgprot_init(void)
2147 {
2148         unsigned long page_none, page_shared, page_copy, page_readonly;
2149         unsigned long page_exec_bit;
2150
2151         PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
2152                                 _PAGE_CACHE_4U | _PAGE_P_4U |
2153                                 __ACCESS_BITS_4U | __DIRTY_BITS_4U |
2154                                 _PAGE_EXEC_4U);
2155         PAGE_KERNEL_LOCKED = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
2156                                        _PAGE_CACHE_4U | _PAGE_P_4U |
2157                                        __ACCESS_BITS_4U | __DIRTY_BITS_4U |
2158                                        _PAGE_EXEC_4U | _PAGE_L_4U);
2159         PAGE_EXEC = __pgprot(_PAGE_EXEC_4U);
2160
2161         _PAGE_IE = _PAGE_IE_4U;
2162         _PAGE_E = _PAGE_E_4U;
2163         _PAGE_CACHE = _PAGE_CACHE_4U;
2164
2165         pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4U | __DIRTY_BITS_4U |
2166                      __ACCESS_BITS_4U | _PAGE_E_4U);
2167
2168 #ifdef CONFIG_DEBUG_PAGEALLOC
2169         kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZBITS_4U) ^
2170                 0xfffff80000000000;
2171 #else
2172         kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4U) ^
2173                 0xfffff80000000000;
2174 #endif
2175         kern_linear_pte_xor[0] |= (_PAGE_CP_4U | _PAGE_CV_4U |
2176                                    _PAGE_P_4U | _PAGE_W_4U);
2177
2178         /* XXX Should use 256MB on Panther. XXX */
2179         kern_linear_pte_xor[1] = kern_linear_pte_xor[0];
2180
2181         _PAGE_SZBITS = _PAGE_SZBITS_4U;
2182         _PAGE_ALL_SZ_BITS =  (_PAGE_SZ4MB_4U | _PAGE_SZ512K_4U |
2183                               _PAGE_SZ64K_4U | _PAGE_SZ8K_4U |
2184                               _PAGE_SZ32MB_4U | _PAGE_SZ256MB_4U);
2185
2186
2187         page_none = _PAGE_PRESENT_4U | _PAGE_ACCESSED_4U | _PAGE_CACHE_4U;
2188         page_shared = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
2189                        __ACCESS_BITS_4U | _PAGE_WRITE_4U | _PAGE_EXEC_4U);
2190         page_copy   = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
2191                        __ACCESS_BITS_4U | _PAGE_EXEC_4U);
2192         page_readonly   = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
2193                            __ACCESS_BITS_4U | _PAGE_EXEC_4U);
2194
2195         page_exec_bit = _PAGE_EXEC_4U;
2196
2197         prot_init_common(page_none, page_shared, page_copy, page_readonly,
2198                          page_exec_bit);
2199 }
2200
2201 static void __init sun4v_pgprot_init(void)
2202 {
2203         unsigned long page_none, page_shared, page_copy, page_readonly;
2204         unsigned long page_exec_bit;
2205
2206         PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4V | _PAGE_VALID |
2207                                 _PAGE_CACHE_4V | _PAGE_P_4V |
2208                                 __ACCESS_BITS_4V | __DIRTY_BITS_4V |
2209                                 _PAGE_EXEC_4V);
2210         PAGE_KERNEL_LOCKED = PAGE_KERNEL;
2211         PAGE_EXEC = __pgprot(_PAGE_EXEC_4V);
2212
2213         _PAGE_IE = _PAGE_IE_4V;
2214         _PAGE_E = _PAGE_E_4V;
2215         _PAGE_CACHE = _PAGE_CACHE_4V;
2216
2217 #ifdef CONFIG_DEBUG_PAGEALLOC
2218         kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZBITS_4V) ^
2219                 0xfffff80000000000;
2220 #else
2221         kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4V) ^
2222                 0xfffff80000000000;
2223 #endif
2224         kern_linear_pte_xor[0] |= (_PAGE_CP_4V | _PAGE_CV_4V |
2225                                    _PAGE_P_4V | _PAGE_W_4V);
2226
2227 #ifdef CONFIG_DEBUG_PAGEALLOC
2228         kern_linear_pte_xor[1] = (_PAGE_VALID | _PAGE_SZBITS_4V) ^
2229                 0xfffff80000000000;
2230 #else
2231         kern_linear_pte_xor[1] = (_PAGE_VALID | _PAGE_SZ256MB_4V) ^
2232                 0xfffff80000000000;
2233 #endif
2234         kern_linear_pte_xor[1] |= (_PAGE_CP_4V | _PAGE_CV_4V |
2235                                    _PAGE_P_4V | _PAGE_W_4V);
2236
2237         pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4V | __DIRTY_BITS_4V |
2238                      __ACCESS_BITS_4V | _PAGE_E_4V);
2239
2240         _PAGE_SZBITS = _PAGE_SZBITS_4V;
2241         _PAGE_ALL_SZ_BITS = (_PAGE_SZ16GB_4V | _PAGE_SZ2GB_4V |
2242                              _PAGE_SZ256MB_4V | _PAGE_SZ32MB_4V |
2243                              _PAGE_SZ4MB_4V | _PAGE_SZ512K_4V |
2244                              _PAGE_SZ64K_4V | _PAGE_SZ8K_4V);
2245
2246         page_none = _PAGE_PRESENT_4V | _PAGE_ACCESSED_4V | _PAGE_CACHE_4V;
2247         page_shared = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
2248                        __ACCESS_BITS_4V | _PAGE_WRITE_4V | _PAGE_EXEC_4V);
2249         page_copy   = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
2250                        __ACCESS_BITS_4V | _PAGE_EXEC_4V);
2251         page_readonly = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
2252                          __ACCESS_BITS_4V | _PAGE_EXEC_4V);
2253
2254         page_exec_bit = _PAGE_EXEC_4V;
2255
2256         prot_init_common(page_none, page_shared, page_copy, page_readonly,
2257                          page_exec_bit);
2258 }
2259
2260 unsigned long pte_sz_bits(unsigned long sz)
2261 {
2262         if (tlb_type == hypervisor) {
2263                 switch (sz) {
2264                 case 8 * 1024:
2265                 default:
2266                         return _PAGE_SZ8K_4V;
2267                 case 64 * 1024:
2268                         return _PAGE_SZ64K_4V;
2269                 case 512 * 1024:
2270                         return _PAGE_SZ512K_4V;
2271                 case 4 * 1024 * 1024:
2272                         return _PAGE_SZ4MB_4V;
2273                 };
2274         } else {
2275                 switch (sz) {
2276                 case 8 * 1024:
2277                 default:
2278                         return _PAGE_SZ8K_4U;
2279                 case 64 * 1024:
2280                         return _PAGE_SZ64K_4U;
2281                 case 512 * 1024:
2282                         return _PAGE_SZ512K_4U;
2283                 case 4 * 1024 * 1024:
2284                         return _PAGE_SZ4MB_4U;
2285                 };
2286         }
2287 }
2288
2289 pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space, unsigned long page_size)
2290 {
2291         pte_t pte;
2292
2293         pte_val(pte)  = page | pgprot_val(pgprot_noncached(prot));
2294         pte_val(pte) |= (((unsigned long)space) << 32);
2295         pte_val(pte) |= pte_sz_bits(page_size);
2296
2297         return pte;
2298 }
2299
2300 static unsigned long kern_large_tte(unsigned long paddr)
2301 {
2302         unsigned long val;
2303
2304         val = (_PAGE_VALID | _PAGE_SZ4MB_4U |
2305                _PAGE_CP_4U | _PAGE_CV_4U | _PAGE_P_4U |
2306                _PAGE_EXEC_4U | _PAGE_L_4U | _PAGE_W_4U);
2307         if (tlb_type == hypervisor)
2308                 val = (_PAGE_VALID | _PAGE_SZ4MB_4V |
2309                        _PAGE_CP_4V | _PAGE_CV_4V | _PAGE_P_4V |
2310                        _PAGE_EXEC_4V | _PAGE_W_4V);
2311
2312         return val | paddr;
2313 }
2314
2315 /* If not locked, zap it. */
2316 void __flush_tlb_all(void)
2317 {
2318         unsigned long pstate;
2319         int i;
2320
2321         __asm__ __volatile__("flushw\n\t"
2322                              "rdpr      %%pstate, %0\n\t"
2323                              "wrpr      %0, %1, %%pstate"
2324                              : "=r" (pstate)
2325                              : "i" (PSTATE_IE));
2326         if (tlb_type == hypervisor) {
2327                 sun4v_mmu_demap_all();
2328         } else if (tlb_type == spitfire) {
2329                 for (i = 0; i < 64; i++) {
2330                         /* Spitfire Errata #32 workaround */
2331                         /* NOTE: Always runs on spitfire, so no
2332                          *       cheetah+ page size encodings.
2333                          */
2334                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
2335                                              "flush     %%g6"
2336                                              : /* No outputs */
2337                                              : "r" (0),
2338                                              "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
2339
2340                         if (!(spitfire_get_dtlb_data(i) & _PAGE_L_4U)) {
2341                                 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
2342                                                      "membar #Sync"
2343                                                      : /* no outputs */
2344                                                      : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
2345                                 spitfire_put_dtlb_data(i, 0x0UL);
2346                         }
2347
2348                         /* Spitfire Errata #32 workaround */
2349                         /* NOTE: Always runs on spitfire, so no
2350                          *       cheetah+ page size encodings.
2351                          */
2352                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
2353                                              "flush     %%g6"
2354                                              : /* No outputs */
2355                                              : "r" (0),
2356                                              "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
2357
2358                         if (!(spitfire_get_itlb_data(i) & _PAGE_L_4U)) {
2359                                 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
2360                                                      "membar #Sync"
2361                                                      : /* no outputs */
2362                                                      : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
2363                                 spitfire_put_itlb_data(i, 0x0UL);
2364                         }
2365                 }
2366         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
2367                 cheetah_flush_dtlb_all();
2368                 cheetah_flush_itlb_all();
2369         }
2370         __asm__ __volatile__("wrpr      %0, 0, %%pstate"
2371                              : : "r" (pstate));
2372 }