arch/sh/mm/init.c

   1 /*
   2  * linux/arch/sh/mm/init.c
   3  *
   4  *  Copyright (C) 1999  Niibe Yutaka
   5  *  Copyright (C) 2002 - 2010  Paul Mundt
   6  *
   7  *  Based on linux/arch/i386/mm/init.c:
   8  *   Copyright (C) 1995  Linus Torvalds
   9  */
  10 #include <linux/mm.h>
  11 #include <linux/swap.h>
  12 #include <linux/init.h>
  13 #include <linux/gfp.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/percpu.h>
  18 #include <linux/io.h>
  19 #include <linux/memblock.h>
  20 #include <linux/dma-mapping.h>
  21 #include <asm/mmu_context.h>
  22 #include <asm/mmzone.h>
  23 #include <asm/kexec.h>
  24 #include <asm/tlb.h>
  25 #include <asm/cacheflush.h>
  26 #include <asm/sections.h>
  27 #include <asm/setup.h>
  28 #include <asm/cache.h>
  29 #include <asm/sizes.h>
  30
  31 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
  33
  34 void __init generic_mem_init(void)
  35 {
  36         memblock_add(__MEMORY_START, __MEMORY_SIZE);
  37 }
  38
  39 void __init __weak plat_mem_setup(void)
  40 {
  41         /* Nothing to see here, move along. */
  42 }
  43
  44 #ifdef CONFIG_MMU
  45 static pte_t *__get_pte_phys(unsigned long addr)
  46 {
  47         pgd_t *pgd;
  48         pud_t *pud;
  49         pmd_t *pmd;
  50
  51         pgd = pgd_offset_k(addr);
  52         if (pgd_none(*pgd)) {
  53                 pgd_ERROR(*pgd);
  54                 return NULL;
  55         }
  56
  57         pud = pud_alloc(NULL, pgd, addr);
  58         if (unlikely(!pud)) {
  59                 pud_ERROR(*pud);
  60                 return NULL;
  61         }
  62
  63         pmd = pmd_alloc(NULL, pud, addr);
  64         if (unlikely(!pmd)) {
  65                 pmd_ERROR(*pmd);
  66                 return NULL;
  67         }
  68
  69         return pte_offset_kernel(pmd, addr);
  70 }
  71
  72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  73 {
  74         pte_t *pte;
  75
  76         pte = __get_pte_phys(addr);
  77         if (!pte_none(*pte)) {
  78                 pte_ERROR(*pte);
  79                 return;
  80         }
  81
  82         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  83         local_flush_tlb_one(get_asid(), addr);
  84
  85         if (pgprot_val(prot) & _PAGE_WIRED)
  86                 tlb_wire_entry(NULL, addr, *pte);
  87 }
  88
  89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  90 {
  91         pte_t *pte;
  92
  93         pte = __get_pte_phys(addr);
  94
  95         if (pgprot_val(prot) & _PAGE_WIRED)
  96                 tlb_unwire_entry();
  97
  98         set_pte(pte, pfn_pte(0, __pgprot(0)));
  99         local_flush_tlb_one(get_asid(), addr);
 100 }
 101
 102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 103 {
 104         unsigned long address = __fix_to_virt(idx);
 105
 106         if (idx >= __end_of_fixed_addresses) {
 107                 BUG();
 108                 return;
 109         }
 110
 111         set_pte_phys(address, phys, prot);
 112 }
 113
 114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 115 {
 116         unsigned long address = __fix_to_virt(idx);
 117
 118         if (idx >= __end_of_fixed_addresses) {
 119                 BUG();
 120                 return;
 121         }
 122
 123         clear_pte_phys(address, prot);
 124 }
 125
 126 static pmd_t * __init one_md_table_init(pud_t *pud)
 127 {
 128         if (pud_none(*pud)) {
 129                 pmd_t *pmd;
 130
 131                 pmd = alloc_bootmem_pages(PAGE_SIZE);
 132                 pud_populate(&init_mm, pud, pmd);
 133                 BUG_ON(pmd != pmd_offset(pud, 0));
 134         }
 135
 136         return pmd_offset(pud, 0);
 137 }
 138
 139 static pte_t * __init one_page_table_init(pmd_t *pmd)
 140 {
 141         if (pmd_none(*pmd)) {
 142                 pte_t *pte;
 143
 144                 pte = alloc_bootmem_pages(PAGE_SIZE);
 145                 pmd_populate_kernel(&init_mm, pmd, pte);
 146                 BUG_ON(pte != pte_offset_kernel(pmd, 0));
 147         }
 148
 149         return pte_offset_kernel(pmd, 0);
 150 }
 151
 152 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
 153                                             unsigned long vaddr, pte_t *lastpte)
 154 {
 155         return pte;
 156 }
 157
 158 void __init page_table_range_init(unsigned long start, unsigned long end,
 159                                          pgd_t *pgd_base)
 160 {
 161         pgd_t *pgd;
 162         pud_t *pud;
 163         pmd_t *pmd;
 164         pte_t *pte = NULL;
 165         int i, j, k;
 166         unsigned long vaddr;
 167
 168         vaddr = start;
 169         i = __pgd_offset(vaddr);
 170         j = __pud_offset(vaddr);
 171         k = __pmd_offset(vaddr);
 172         pgd = pgd_base + i;
 173
 174         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 175                 pud = (pud_t *)pgd;
 176                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 177                         pmd = one_md_table_init(pud);
 178 #ifndef __PAGETABLE_PMD_FOLDED
 179                         pmd += k;
 180 #endif
 181                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 182                                 pte = page_table_kmap_check(one_page_table_init(pmd),
 183                                                             pmd, vaddr, pte);
 184                                 vaddr += PMD_SIZE;
 185                         }
 186                         k = 0;
 187                 }
 188                 j = 0;
 189         }
 190 }
 191 #endif  /* CONFIG_MMU */
 192
 193 void __init allocate_pgdat(unsigned int nid)
 194 {
 195         unsigned long start_pfn, end_pfn;
 196 #ifdef CONFIG_NEED_MULTIPLE_NODES
 197         unsigned long phys;
 198 #endif
 199
 200         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 201
 202 #ifdef CONFIG_NEED_MULTIPLE_NODES
 203         phys = __memblock_alloc_base(sizeof(struct pglist_data),
 204                                 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
 205         /* Retry with all of system memory */
 206         if (!phys)
 207                 phys = __memblock_alloc_base(sizeof(struct pglist_data),
 208                                         SMP_CACHE_BYTES, memblock_end_of_DRAM());
 209         if (!phys)
 210                 panic("Can't allocate pgdat for node %d\n", nid);
 211
 212         NODE_DATA(nid) = __va(phys);
 213         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 214
 215         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
 216 #endif
 217
 218         NODE_DATA(nid)->node_start_pfn = start_pfn;
 219         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 220 }
 221
 222 static void __init bootmem_init_one_node(unsigned int nid)
 223 {
 224         unsigned long total_pages, paddr;
 225         unsigned long end_pfn;
 226         struct pglist_data *p;
 227
 228         p = NODE_DATA(nid);
 229
 230         /* Nothing to do.. */
 231         if (!p->node_spanned_pages)
 232                 return;
 233
 234         end_pfn = p->node_start_pfn + p->node_spanned_pages;
 235
 236         total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
 237
 238         paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
 239         if (!paddr)
 240                 panic("Can't allocate bootmap for nid[%d]\n", nid);
 241
 242         init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
 243
 244         free_bootmem_with_active_regions(nid, end_pfn);
 245
 246         /*
 247          * XXX Handle initial reservations for the system memory node
 248          * only for the moment, we'll refactor this later for handling
 249          * reservations in other nodes.
 250          */
 251         if (nid == 0) {
 252                 struct memblock_region *reg;
 253
 254                 /* Reserve the sections we're already using. */
 255                 for_each_memblock(reserved, reg) {
 256                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 257                 }
 258         }
 259
 260         sparse_memory_present_with_active_regions(nid);
 261 }
 262
 263 static void __init do_init_bootmem(void)
 264 {
 265         struct memblock_region *reg;
 266         int i;
 267
 268         /* Add active regions with valid PFNs. */
 269         for_each_memblock(memory, reg) {
 270                 unsigned long start_pfn, end_pfn;
 271                 start_pfn = memblock_region_memory_base_pfn(reg);
 272                 end_pfn = memblock_region_memory_end_pfn(reg);
 273                 __add_active_range(0, start_pfn, end_pfn);
 274         }
 275
 276         /* All of system RAM sits in node 0 for the non-NUMA case */
 277         allocate_pgdat(0);
 278         node_set_online(0);
 279
 280         plat_mem_setup();
 281
 282         for_each_online_node(i)
 283                 bootmem_init_one_node(i);
 284
 285         sparse_init();
 286 }
 287
 288 static void __init early_reserve_mem(void)
 289 {
 290         unsigned long start_pfn;
 291
 292         /*
 293          * Partially used pages are not usable - thus
 294          * we are rounding upwards:
 295          */
 296         start_pfn = PFN_UP(__pa(_end));
 297
 298         /*
 299          * Reserve the kernel text and Reserve the bootmem bitmap. We do
 300          * this in two steps (first step was init_bootmem()), because
 301          * this catches the (definitely buggy) case of us accidentally
 302          * initializing the bootmem allocator with an invalid RAM area.
 303          */
 304         memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 305                     (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
 306                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
 307
 308         /*
 309          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 310          */
 311         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 312                 memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
 313
 314         /*
 315          * Handle additional early reservations
 316          */
 317         check_for_initrd();
 318         reserve_crashkernel();
 319 }
 320
 321 void __init paging_init(void)
 322 {
 323         unsigned long max_zone_pfns[MAX_NR_ZONES];
 324         unsigned long vaddr, end;
 325         int nid;
 326
 327         memblock_init();
 328
 329         sh_mv.mv_mem_init();
 330
 331         early_reserve_mem();
 332
 333         memblock_enforce_memory_limit(memory_limit);
 334         memblock_analyze();
 335
 336         memblock_dump_all();
 337
 338         /*
 339          * Determine low and high memory ranges:
 340          */
 341         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
 342         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 343
 344         nodes_clear(node_online_map);
 345
 346         memory_start = (unsigned long)__va(__MEMORY_START);
 347         memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
 348
 349         uncached_init();
 350         pmb_init();
 351         do_init_bootmem();
 352         ioremap_fixed_init();
 353
 354         /* We don't need to map the kernel through the TLB, as
 355          * it is permanatly mapped using P1. So clear the
 356          * entire pgd. */
 357         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 358
 359         /* Set an initial value for the MMU.TTB so we don't have to
 360          * check for a null value. */
 361         set_TTB(swapper_pg_dir);
 362
 363         /*
 364          * Populate the relevant portions of swapper_pg_dir so that
 365          * we can use the fixmap entries without calling kmalloc.
 366          * pte's will be filled in by __set_fixmap().
 367          */
 368         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 369         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 370         page_table_range_init(vaddr, end, swapper_pg_dir);
 371
 372         kmap_coherent_init();
 373
 374         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 375
 376         for_each_online_node(nid) {
 377                 pg_data_t *pgdat = NODE_DATA(nid);
 378                 unsigned long low, start_pfn;
 379
 380                 start_pfn = pgdat->bdata->node_min_pfn;
 381                 low = pgdat->bdata->node_low_pfn;
 382
 383                 if (max_zone_pfns[ZONE_NORMAL] < low)
 384                         max_zone_pfns[ZONE_NORMAL] = low;
 385
 386                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 387                        nid, start_pfn, low);
 388         }
 389
 390         free_area_init_nodes(max_zone_pfns);
 391 }
 392
 393 /*
 394  * Early initialization for any I/O MMUs we might have.
 395  */
 396 static void __init iommu_init(void)
 397 {
 398         no_iommu_init();
 399 }
 400
 401 unsigned int mem_init_done = 0;
 402
 403 void __init mem_init(void)
 404 {
 405         int codesize, datasize, initsize;
 406         int nid;
 407
 408         iommu_init();
 409
 410         num_physpages = 0;
 411         high_memory = NULL;
 412
 413         for_each_online_node(nid) {
 414                 pg_data_t *pgdat = NODE_DATA(nid);
 415                 unsigned long node_pages = 0;
 416                 void *node_high_memory;
 417
 418                 num_physpages += pgdat->node_present_pages;
 419
 420                 if (pgdat->node_spanned_pages)
 421                         node_pages = free_all_bootmem_node(pgdat);
 422
 423                 totalram_pages += node_pages;
 424
 425                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
 426                                                  pgdat->node_spanned_pages) <<
 427                                                  PAGE_SHIFT);
 428                 if (node_high_memory > high_memory)
 429                         high_memory = node_high_memory;
 430         }
 431
 432         /* Set this up early, so we can take care of the zero page */
 433         cpu_cache_init();
 434
 435         /* clear the zero-page */
 436         memset(empty_zero_page, 0, PAGE_SIZE);
 437         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 438
 439         vsyscall_init();
 440
 441         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 442         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 443         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 444
 445         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 446                "%dk data, %dk init)\n",
 447                 nr_free_pages() << (PAGE_SHIFT-10),
 448                 num_physpages << (PAGE_SHIFT-10),
 449                 codesize >> 10,
 450                 datasize >> 10,
 451                 initsize >> 10);
 452
 453         printk(KERN_INFO "virtual kernel memory layout:\n"
 454                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 455 #ifdef CONFIG_HIGHMEM
 456                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 457 #endif
 458                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 459                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 460 #ifdef CONFIG_UNCACHED_MAPPING
 461                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 462 #endif
 463                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 464                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 465                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 466                 FIXADDR_START, FIXADDR_TOP,
 467                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 468
 469 #ifdef CONFIG_HIGHMEM
 470                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 471                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 472 #endif
 473
 474                 (unsigned long)VMALLOC_START, VMALLOC_END,
 475                 (VMALLOC_END - VMALLOC_START) >> 20,
 476
 477                 (unsigned long)memory_start, (unsigned long)high_memory,
 478                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 479
 480 #ifdef CONFIG_UNCACHED_MAPPING
 481                 uncached_start, uncached_end, uncached_size >> 20,
 482 #endif
 483
 484                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 485                 ((unsigned long)&__init_end -
 486                  (unsigned long)&__init_begin) >> 10,
 487
 488                 (unsigned long)&_etext, (unsigned long)&_edata,
 489                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 490
 491                 (unsigned long)&_text, (unsigned long)&_etext,
 492                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 493
 494         mem_init_done = 1;
 495 }
 496
 497 void free_initmem(void)
 498 {
 499         unsigned long addr;
 500
 501         addr = (unsigned long)(&__init_begin);
 502         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 503                 ClearPageReserved(virt_to_page(addr));
 504                 init_page_count(virt_to_page(addr));
 505                 free_page(addr);
 506                 totalram_pages++;
 507         }
 508         printk("Freeing unused kernel memory: %ldk freed\n",
 509                ((unsigned long)&__init_end -
 510                 (unsigned long)&__init_begin) >> 10);
 511 }
 512
 513 #ifdef CONFIG_BLK_DEV_INITRD
 514 void free_initrd_mem(unsigned long start, unsigned long end)
 515 {
 516         unsigned long p;
 517         for (p = start; p < end; p += PAGE_SIZE) {
 518                 ClearPageReserved(virt_to_page(p));
 519                 init_page_count(virt_to_page(p));
 520                 free_page(p);
 521                 totalram_pages++;
 522         }
 523         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 524 }
 525 #endif
 526
 527 #ifdef CONFIG_MEMORY_HOTPLUG
 528 int arch_add_memory(int nid, u64 start, u64 size)
 529 {
 530         pg_data_t *pgdat;
 531         unsigned long start_pfn = start >> PAGE_SHIFT;
 532         unsigned long nr_pages = size >> PAGE_SHIFT;
 533         int ret;
 534
 535         pgdat = NODE_DATA(nid);
 536
 537         /* We only have ZONE_NORMAL, so this is easy.. */
 538         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
 539                                 start_pfn, nr_pages);
 540         if (unlikely(ret))
 541                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 542
 543         return ret;
 544 }
 545 EXPORT_SYMBOL_GPL(arch_add_memory);
 546
 547 #ifdef CONFIG_NUMA
 548 int memory_add_physaddr_to_nid(u64 addr)
 549 {
 550         /* Node 0 for now.. */
 551         return 0;
 552 }
 553 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 554 #endif
 555
 556 #endif /* CONFIG_MEMORY_HOTPLUG */