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 <linux/export.h>
  22 #include <asm/mmu_context.h>
  23 #include <asm/mmzone.h>
  24 #include <asm/kexec.h>
  25 #include <asm/tlb.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/sections.h>
  28 #include <asm/setup.h>
  29 #include <asm/cache.h>
  30 #include <asm/sizes.h>
  31
  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 = pgdat_end_pfn(p);
 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         u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
 292         u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
 293
 294         /*
 295          * Partially used pages are not usable - thus
 296          * we are rounding upwards:
 297          */
 298         start_pfn = PFN_UP(__pa(_end));
 299
 300         /*
 301          * Reserve the kernel text and Reserve the bootmem bitmap. We do
 302          * this in two steps (first step was init_bootmem()), because
 303          * this catches the (definitely buggy) case of us accidentally
 304          * initializing the bootmem allocator with an invalid RAM area.
 305          */
 306         memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
 307
 308         /*
 309          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 310          */
 311         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 312                 memblock_reserve(zero_base, 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         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_allow_resize();
 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         pg_data_t *pgdat;
 411
 412         iommu_init();
 413
 414         high_memory = NULL;
 415         for_each_online_pgdat(pgdat)
 416                 high_memory = max_t(void *, high_memory,
 417                                     __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
 418
 419         free_all_bootmem();
 420
 421         /* Set this up early, so we can take care of the zero page */
 422         cpu_cache_init();
 423
 424         /* clear the zero-page */
 425         memset(empty_zero_page, 0, PAGE_SIZE);
 426         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 427
 428         vsyscall_init();
 429
 430         mem_init_print_info(NULL);
 431         pr_info("virtual kernel memory layout:\n"
 432                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 433 #ifdef CONFIG_HIGHMEM
 434                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 435 #endif
 436                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 437                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 438 #ifdef CONFIG_UNCACHED_MAPPING
 439                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 440 #endif
 441                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 442                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 443                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 444                 FIXADDR_START, FIXADDR_TOP,
 445                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 446
 447 #ifdef CONFIG_HIGHMEM
 448                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 449                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 450 #endif
 451
 452                 (unsigned long)VMALLOC_START, VMALLOC_END,
 453                 (VMALLOC_END - VMALLOC_START) >> 20,
 454
 455                 (unsigned long)memory_start, (unsigned long)high_memory,
 456                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 457
 458 #ifdef CONFIG_UNCACHED_MAPPING
 459                 uncached_start, uncached_end, uncached_size >> 20,
 460 #endif
 461
 462                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 463                 ((unsigned long)&__init_end -
 464                  (unsigned long)&__init_begin) >> 10,
 465
 466                 (unsigned long)&_etext, (unsigned long)&_edata,
 467                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 468
 469                 (unsigned long)&_text, (unsigned long)&_etext,
 470                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 471
 472         mem_init_done = 1;
 473 }
 474
 475 void free_initmem(void)
 476 {
 477         free_initmem_default(-1);
 478 }
 479
 480 #ifdef CONFIG_BLK_DEV_INITRD
 481 void free_initrd_mem(unsigned long start, unsigned long end)
 482 {
 483         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 484 }
 485 #endif
 486
 487 #ifdef CONFIG_MEMORY_HOTPLUG
 488 int arch_add_memory(int nid, u64 start, u64 size)
 489 {
 490         pg_data_t *pgdat;
 491         unsigned long start_pfn = PFN_DOWN(start);
 492         unsigned long nr_pages = size >> PAGE_SHIFT;
 493         int ret;
 494
 495         pgdat = NODE_DATA(nid);
 496
 497         /* We only have ZONE_NORMAL, so this is easy.. */
 498         ret = __add_pages(nid, pgdat->node_zones +
 499                         zone_for_memory(nid, start, size, ZONE_NORMAL),
 500                         start_pfn, nr_pages);
 501         if (unlikely(ret))
 502                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 503
 504         return ret;
 505 }
 506 EXPORT_SYMBOL_GPL(arch_add_memory);
 507
 508 #ifdef CONFIG_NUMA
 509 int memory_add_physaddr_to_nid(u64 addr)
 510 {
 511         /* Node 0 for now.. */
 512         return 0;
 513 }
 514 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 515 #endif
 516
 517 #ifdef CONFIG_MEMORY_HOTREMOVE
 518 int arch_remove_memory(u64 start, u64 size)
 519 {
 520         unsigned long start_pfn = PFN_DOWN(start);
 521         unsigned long nr_pages = size >> PAGE_SHIFT;
 522         struct zone *zone;
 523         int ret;
 524
 525         zone = page_zone(pfn_to_page(start_pfn));
 526         ret = __remove_pages(zone, start_pfn, nr_pages);
 527         if (unlikely(ret))
 528                 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
 529                         ret);
 530
 531         return ret;
 532 }
 533 #endif
 534 #endif /* CONFIG_MEMORY_HOTPLUG */