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