arch/sh/mm/init.c

   1 /*
   2  * linux/arch/sh/mm/init.c
   3  *
   4  *  Copyright (C) 1999  Niibe Yutaka
   5  *  Copyright (C) 2002 - 2011  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 pgd_t swapper_pg_dir[PTRS_PER_PGD];
  32
  33 void __init generic_mem_init(void)
  34 {
  35         memblock_add(__MEMORY_START, __MEMORY_SIZE);
  36 }
  37
  38 void __init __weak plat_mem_setup(void)
  39 {
  40         /* Nothing to see here, move along. */
  41 }
  42
  43 #ifdef CONFIG_MMU
  44 static pte_t *__get_pte_phys(unsigned long addr)
  45 {
  46         pgd_t *pgd;
  47         pud_t *pud;
  48         pmd_t *pmd;
  49
  50         pgd = pgd_offset_k(addr);
  51         if (pgd_none(*pgd)) {
  52                 pgd_ERROR(*pgd);
  53                 return NULL;
  54         }
  55
  56         pud = pud_alloc(NULL, pgd, addr);
  57         if (unlikely(!pud)) {
  58                 pud_ERROR(*pud);
  59                 return NULL;
  60         }
  61
  62         pmd = pmd_alloc(NULL, pud, addr);
  63         if (unlikely(!pmd)) {
  64                 pmd_ERROR(*pmd);
  65                 return NULL;
  66         }
  67
  68         return pte_offset_kernel(pmd, addr);
  69 }
  70
  71 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  72 {
  73         pte_t *pte;
  74
  75         pte = __get_pte_phys(addr);
  76         if (!pte_none(*pte)) {
  77                 pte_ERROR(*pte);
  78                 return;
  79         }
  80
  81         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  82         local_flush_tlb_one(get_asid(), addr);
  83
  84         if (pgprot_val(prot) & _PAGE_WIRED)
  85                 tlb_wire_entry(NULL, addr, *pte);
  86 }
  87
  88 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  89 {
  90         pte_t *pte;
  91
  92         pte = __get_pte_phys(addr);
  93
  94         if (pgprot_val(prot) & _PAGE_WIRED)
  95                 tlb_unwire_entry();
  96
  97         set_pte(pte, pfn_pte(0, __pgprot(0)));
  98         local_flush_tlb_one(get_asid(), addr);
  99 }
 100
 101 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 102 {
 103         unsigned long address = __fix_to_virt(idx);
 104
 105         if (idx >= __end_of_fixed_addresses) {
 106                 BUG();
 107                 return;
 108         }
 109
 110         set_pte_phys(address, phys, prot);
 111 }
 112
 113 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 114 {
 115         unsigned long address = __fix_to_virt(idx);
 116
 117         if (idx >= __end_of_fixed_addresses) {
 118                 BUG();
 119                 return;
 120         }
 121
 122         clear_pte_phys(address, prot);
 123 }
 124
 125 static pmd_t * __init one_md_table_init(pud_t *pud)
 126 {
 127         if (pud_none(*pud)) {
 128                 pmd_t *pmd;
 129
 130                 pmd = alloc_bootmem_pages(PAGE_SIZE);
 131                 pud_populate(&init_mm, pud, pmd);
 132                 BUG_ON(pmd != pmd_offset(pud, 0));
 133         }
 134
 135         return pmd_offset(pud, 0);
 136 }
 137
 138 static pte_t * __init one_page_table_init(pmd_t *pmd)
 139 {
 140         if (pmd_none(*pmd)) {
 141                 pte_t *pte;
 142
 143                 pte = alloc_bootmem_pages(PAGE_SIZE);
 144                 pmd_populate_kernel(&init_mm, pmd, pte);
 145                 BUG_ON(pte != pte_offset_kernel(pmd, 0));
 146         }
 147
 148         return pte_offset_kernel(pmd, 0);
 149 }
 150
 151 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
 152                                             unsigned long vaddr, pte_t *lastpte)
 153 {
 154         return pte;
 155 }
 156
 157 void __init page_table_range_init(unsigned long start, unsigned long end,
 158                                          pgd_t *pgd_base)
 159 {
 160         pgd_t *pgd;
 161         pud_t *pud;
 162         pmd_t *pmd;
 163         pte_t *pte = NULL;
 164         int i, j, k;
 165         unsigned long vaddr;
 166
 167         vaddr = start;
 168         i = __pgd_offset(vaddr);
 169         j = __pud_offset(vaddr);
 170         k = __pmd_offset(vaddr);
 171         pgd = pgd_base + i;
 172
 173         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 174                 pud = (pud_t *)pgd;
 175                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 176                         pmd = one_md_table_init(pud);
 177 #ifndef __PAGETABLE_PMD_FOLDED
 178                         pmd += k;
 179 #endif
 180                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 181                                 pte = page_table_kmap_check(one_page_table_init(pmd),
 182                                                             pmd, vaddr, pte);
 183                                 vaddr += PMD_SIZE;
 184                         }
 185                         k = 0;
 186                 }
 187                 j = 0;
 188         }
 189 }
 190 #endif  /* CONFIG_MMU */
 191
 192 void __init allocate_pgdat(unsigned int nid)
 193 {
 194         unsigned long start_pfn, end_pfn;
 195 #ifdef CONFIG_NEED_MULTIPLE_NODES
 196         unsigned long phys;
 197 #endif
 198
 199         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 200
 201 #ifdef CONFIG_NEED_MULTIPLE_NODES
 202         phys = __memblock_alloc_base(sizeof(struct pglist_data),
 203                                 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
 204         /* Retry with all of system memory */
 205         if (!phys)
 206                 phys = __memblock_alloc_base(sizeof(struct pglist_data),
 207                                         SMP_CACHE_BYTES, memblock_end_of_DRAM());
 208         if (!phys)
 209                 panic("Can't allocate pgdat for node %d\n", nid);
 210
 211         NODE_DATA(nid) = __va(phys);
 212         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 213
 214         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
 215 #endif
 216
 217         NODE_DATA(nid)->node_start_pfn = start_pfn;
 218         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 219 }
 220
 221 static void __init bootmem_init_one_node(unsigned int nid)
 222 {
 223         unsigned long total_pages, paddr;
 224         unsigned long end_pfn;
 225         struct pglist_data *p;
 226
 227         p = NODE_DATA(nid);
 228
 229         /* Nothing to do.. */
 230         if (!p->node_spanned_pages)
 231                 return;
 232
 233         end_pfn = p->node_start_pfn + p->node_spanned_pages;
 234
 235         total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
 236
 237         paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
 238         if (!paddr)
 239                 panic("Can't allocate bootmap for nid[%d]\n", nid);
 240
 241         init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
 242
 243         free_bootmem_with_active_regions(nid, end_pfn);
 244
 245         /*
 246          * XXX Handle initial reservations for the system memory node
 247          * only for the moment, we'll refactor this later for handling
 248          * reservations in other nodes.
 249          */
 250         if (nid == 0) {
 251                 struct memblock_region *reg;
 252
 253                 /* Reserve the sections we're already using. */
 254                 for_each_memblock(reserved, reg) {
 255                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 256                 }
 257         }
 258
 259         sparse_memory_present_with_active_regions(nid);
 260 }
 261
 262 static void __init do_init_bootmem(void)
 263 {
 264         struct memblock_region *reg;
 265         int i;
 266
 267         /* Add active regions with valid PFNs. */
 268         for_each_memblock(memory, reg) {
 269                 unsigned long start_pfn, end_pfn;
 270                 start_pfn = memblock_region_memory_base_pfn(reg);
 271                 end_pfn = memblock_region_memory_end_pfn(reg);
 272                 __add_active_range(0, start_pfn, end_pfn);
 273         }
 274
 275         /* All of system RAM sits in node 0 for the non-NUMA case */
 276         allocate_pgdat(0);
 277         node_set_online(0);
 278
 279         plat_mem_setup();
 280
 281         for_each_online_node(i)
 282                 bootmem_init_one_node(i);
 283
 284         sparse_init();
 285 }
 286
 287 static void __init early_reserve_mem(void)
 288 {
 289         unsigned long start_pfn;
 290
 291         /*
 292          * Partially used pages are not usable - thus
 293          * we are rounding upwards:
 294          */
 295         start_pfn = PFN_UP(__pa(_end));
 296
 297         /*
 298          * Reserve the kernel text and Reserve the bootmem bitmap. We do
 299          * this in two steps (first step was init_bootmem()), because
 300          * this catches the (definitely buggy) case of us accidentally
 301          * initializing the bootmem allocator with an invalid RAM area.
 302          */
 303         memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 304                     (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
 305                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
 306
 307         /*
 308          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 309          */
 310         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 311                 memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
 312
 313         /*
 314          * Handle additional early reservations
 315          */
 316         check_for_initrd();
 317         reserve_crashkernel();
 318 }
 319
 320 void __init paging_init(void)
 321 {
 322         unsigned long max_zone_pfns[MAX_NR_ZONES];
 323         unsigned long vaddr, end;
 324         int nid;
 325
 326         memblock_init();
 327         sh_mv.mv_mem_init();
 328
 329         early_reserve_mem();
 330
 331         /*
 332          * Once the early reservations are out of the way, give the
 333          * platforms a chance to kick out some memory.
 334          */
 335         if (sh_mv.mv_mem_reserve)
 336                 sh_mv.mv_mem_reserve();
 337
 338         memblock_enforce_memory_limit(memory_limit);
 339         memblock_analyze();
 340
 341         memblock_dump_all();
 342
 343         /*
 344          * Determine low and high memory ranges:
 345          */
 346         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
 347         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 348
 349         nodes_clear(node_online_map);
 350
 351         memory_start = (unsigned long)__va(__MEMORY_START);
 352         memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
 353
 354         uncached_init();
 355         pmb_init();
 356         do_init_bootmem();
 357         ioremap_fixed_init();
 358
 359         /* We don't need to map the kernel through the TLB, as
 360          * it is permanatly mapped using P1. So clear the
 361          * entire pgd. */
 362         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 363
 364         /* Set an initial value for the MMU.TTB so we don't have to
 365          * check for a null value. */
 366         set_TTB(swapper_pg_dir);
 367
 368         /*
 369          * Populate the relevant portions of swapper_pg_dir so that
 370          * we can use the fixmap entries without calling kmalloc.
 371          * pte's will be filled in by __set_fixmap().
 372          */
 373         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 374         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 375         page_table_range_init(vaddr, end, swapper_pg_dir);
 376
 377         kmap_coherent_init();
 378
 379         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 380
 381         for_each_online_node(nid) {
 382                 pg_data_t *pgdat = NODE_DATA(nid);
 383                 unsigned long low, start_pfn;
 384
 385                 start_pfn = pgdat->bdata->node_min_pfn;
 386                 low = pgdat->bdata->node_low_pfn;
 387
 388                 if (max_zone_pfns[ZONE_NORMAL] < low)
 389                         max_zone_pfns[ZONE_NORMAL] = low;
 390
 391                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 392                        nid, start_pfn, low);
 393         }
 394
 395         free_area_init_nodes(max_zone_pfns);
 396 }
 397
 398 /*
 399  * Early initialization for any I/O MMUs we might have.
 400  */
 401 static void __init iommu_init(void)
 402 {
 403         no_iommu_init();
 404 }
 405
 406 unsigned int mem_init_done = 0;
 407
 408 void __init mem_init(void)
 409 {
 410         int codesize, datasize, initsize;
 411         int nid;
 412
 413         iommu_init();
 414
 415         num_physpages = 0;
 416         high_memory = NULL;
 417
 418         for_each_online_node(nid) {
 419                 pg_data_t *pgdat = NODE_DATA(nid);
 420                 unsigned long node_pages = 0;
 421                 void *node_high_memory;
 422
 423                 num_physpages += pgdat->node_present_pages;
 424
 425                 if (pgdat->node_spanned_pages)
 426                         node_pages = free_all_bootmem_node(pgdat);
 427
 428                 totalram_pages += node_pages;
 429
 430                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
 431                                                  pgdat->node_spanned_pages) <<
 432                                                  PAGE_SHIFT);
 433                 if (node_high_memory > high_memory)
 434                         high_memory = node_high_memory;
 435         }
 436
 437         /* Set this up early, so we can take care of the zero page */
 438         cpu_cache_init();
 439
 440         /* clear the zero-page */
 441         memset(empty_zero_page, 0, PAGE_SIZE);
 442         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 443
 444         vsyscall_init();
 445
 446         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 447         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 448         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 449
 450         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 451                "%dk data, %dk init)\n",
 452                 nr_free_pages() << (PAGE_SHIFT-10),
 453                 num_physpages << (PAGE_SHIFT-10),
 454                 codesize >> 10,
 455                 datasize >> 10,
 456                 initsize >> 10);
 457
 458         printk(KERN_INFO "virtual kernel memory layout:\n"
 459                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 460 #ifdef CONFIG_HIGHMEM
 461                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 462 #endif
 463                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 464                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 465 #ifdef CONFIG_UNCACHED_MAPPING
 466                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 467 #endif
 468                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 469                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 470                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 471                 FIXADDR_START, FIXADDR_TOP,
 472                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 473
 474 #ifdef CONFIG_HIGHMEM
 475                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 476                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 477 #endif
 478
 479                 (unsigned long)VMALLOC_START, VMALLOC_END,
 480                 (VMALLOC_END - VMALLOC_START) >> 20,
 481
 482                 (unsigned long)memory_start, (unsigned long)high_memory,
 483                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 484
 485 #ifdef CONFIG_UNCACHED_MAPPING
 486                 uncached_start, uncached_end, uncached_size >> 20,
 487 #endif
 488
 489                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 490                 ((unsigned long)&__init_end -
 491                  (unsigned long)&__init_begin) >> 10,
 492
 493                 (unsigned long)&_etext, (unsigned long)&_edata,
 494                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 495
 496                 (unsigned long)&_text, (unsigned long)&_etext,
 497                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 498
 499         mem_init_done = 1;
 500 }
 501
 502 void free_initmem(void)
 503 {
 504         unsigned long addr;
 505
 506         addr = (unsigned long)(&__init_begin);
 507         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 508                 ClearPageReserved(virt_to_page(addr));
 509                 init_page_count(virt_to_page(addr));
 510                 free_page(addr);
 511                 totalram_pages++;
 512         }
 513         printk("Freeing unused kernel memory: %ldk freed\n",
 514                ((unsigned long)&__init_end -
 515                 (unsigned long)&__init_begin) >> 10);
 516 }
 517
 518 #ifdef CONFIG_BLK_DEV_INITRD
 519 void free_initrd_mem(unsigned long start, unsigned long end)
 520 {
 521         unsigned long p;
 522         for (p = start; p < end; p += PAGE_SIZE) {
 523                 ClearPageReserved(virt_to_page(p));
 524                 init_page_count(virt_to_page(p));
 525                 free_page(p);
 526                 totalram_pages++;
 527         }
 528         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 529 }
 530 #endif
 531
 532 #ifdef CONFIG_MEMORY_HOTPLUG
 533 int arch_add_memory(int nid, u64 start, u64 size)
 534 {
 535         pg_data_t *pgdat;
 536         unsigned long start_pfn = start >> PAGE_SHIFT;
 537         unsigned long nr_pages = size >> PAGE_SHIFT;
 538         int ret;
 539
 540         pgdat = NODE_DATA(nid);
 541
 542         /* We only have ZONE_NORMAL, so this is easy.. */
 543         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
 544                                 start_pfn, nr_pages);
 545         if (unlikely(ret))
 546                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 547
 548         return ret;
 549 }
 550 EXPORT_SYMBOL_GPL(arch_add_memory);
 551
 552 #ifdef CONFIG_NUMA
 553 int memory_add_physaddr_to_nid(u64 addr)
 554 {
 555         /* Node 0 for now.. */
 556         return 0;
 557 }
 558 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 559 #endif
 560
 561 #endif /* CONFIG_MEMORY_HOTPLUG */