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/memblock.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/dma-mapping.h>
  20 #include <linux/export.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 <linux/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 = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 131                 if (!pmd)
 132                         panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 133                               __func__, PAGE_SIZE, PAGE_SIZE);
 134                 pud_populate(&init_mm, pud, pmd);
 135                 BUG_ON(pmd != pmd_offset(pud, 0));
 136         }
 137
 138         return pmd_offset(pud, 0);
 139 }
 140
 141 static pte_t * __init one_page_table_init(pmd_t *pmd)
 142 {
 143         if (pmd_none(*pmd)) {
 144                 pte_t *pte;
 145
 146                 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 147                 if (!pte)
 148                         panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 149                               __func__, PAGE_SIZE, PAGE_SIZE);
 150                 pmd_populate_kernel(&init_mm, pmd, pte);
 151                 BUG_ON(pte != pte_offset_kernel(pmd, 0));
 152         }
 153
 154         return pte_offset_kernel(pmd, 0);
 155 }
 156
 157 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
 158                                             unsigned long vaddr, pte_t *lastpte)
 159 {
 160         return pte;
 161 }
 162
 163 void __init page_table_range_init(unsigned long start, unsigned long end,
 164                                          pgd_t *pgd_base)
 165 {
 166         pgd_t *pgd;
 167         pud_t *pud;
 168         pmd_t *pmd;
 169         pte_t *pte = NULL;
 170         int i, j, k;
 171         unsigned long vaddr;
 172
 173         vaddr = start;
 174         i = __pgd_offset(vaddr);
 175         j = __pud_offset(vaddr);
 176         k = __pmd_offset(vaddr);
 177         pgd = pgd_base + i;
 178
 179         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 180                 pud = (pud_t *)pgd;
 181                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 182                         pmd = one_md_table_init(pud);
 183 #ifndef __PAGETABLE_PMD_FOLDED
 184                         pmd += k;
 185 #endif
 186                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 187                                 pte = page_table_kmap_check(one_page_table_init(pmd),
 188                                                             pmd, vaddr, pte);
 189                                 vaddr += PMD_SIZE;
 190                         }
 191                         k = 0;
 192                 }
 193                 j = 0;
 194         }
 195 }
 196 #endif  /* CONFIG_MMU */
 197
 198 void __init allocate_pgdat(unsigned int nid)
 199 {
 200         unsigned long start_pfn, end_pfn;
 201
 202         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 203
 204 #ifdef CONFIG_NEED_MULTIPLE_NODES
 205         NODE_DATA(nid) = memblock_alloc_try_nid(
 206                                 sizeof(struct pglist_data),
 207                                 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
 208                                 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 209         if (!NODE_DATA(nid))
 210                 panic("Can't allocate pgdat for node %d\n", nid);
 211 #endif
 212
 213         NODE_DATA(nid)->node_start_pfn = start_pfn;
 214         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 215 }
 216
 217 static void __init do_init_bootmem(void)
 218 {
 219         struct memblock_region *reg;
 220
 221         /* Add active regions with valid PFNs. */
 222         for_each_memblock(memory, reg) {
 223                 unsigned long start_pfn, end_pfn;
 224                 start_pfn = memblock_region_memory_base_pfn(reg);
 225                 end_pfn = memblock_region_memory_end_pfn(reg);
 226                 __add_active_range(0, start_pfn, end_pfn);
 227         }
 228
 229         /* All of system RAM sits in node 0 for the non-NUMA case */
 230         allocate_pgdat(0);
 231         node_set_online(0);
 232
 233         plat_mem_setup();
 234
 235         for_each_memblock(memory, reg) {
 236                 int nid = memblock_get_region_node(reg);
 237
 238                 memory_present(nid, memblock_region_memory_base_pfn(reg),
 239                         memblock_region_memory_end_pfn(reg));
 240         }
 241         sparse_init();
 242 }
 243
 244 static void __init early_reserve_mem(void)
 245 {
 246         unsigned long start_pfn;
 247         u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
 248         u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
 249
 250         /*
 251          * Partially used pages are not usable - thus
 252          * we are rounding upwards:
 253          */
 254         start_pfn = PFN_UP(__pa(_end));
 255
 256         /*
 257          * Reserve the kernel text and Reserve the bootmem bitmap. We do
 258          * this in two steps (first step was init_bootmem()), because
 259          * this catches the (definitely buggy) case of us accidentally
 260          * initializing the bootmem allocator with an invalid RAM area.
 261          */
 262         memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
 263
 264         /*
 265          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 266          */
 267         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 268                 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
 269
 270         /*
 271          * Handle additional early reservations
 272          */
 273         check_for_initrd();
 274         reserve_crashkernel();
 275 }
 276
 277 void __init paging_init(void)
 278 {
 279         unsigned long max_zone_pfns[MAX_NR_ZONES];
 280         unsigned long vaddr, end;
 281
 282         sh_mv.mv_mem_init();
 283
 284         early_reserve_mem();
 285
 286         /*
 287          * Once the early reservations are out of the way, give the
 288          * platforms a chance to kick out some memory.
 289          */
 290         if (sh_mv.mv_mem_reserve)
 291                 sh_mv.mv_mem_reserve();
 292
 293         memblock_enforce_memory_limit(memory_limit);
 294         memblock_allow_resize();
 295
 296         memblock_dump_all();
 297
 298         /*
 299          * Determine low and high memory ranges:
 300          */
 301         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
 302         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 303
 304         nodes_clear(node_online_map);
 305
 306         memory_start = (unsigned long)__va(__MEMORY_START);
 307         memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
 308
 309         uncached_init();
 310         pmb_init();
 311         do_init_bootmem();
 312         ioremap_fixed_init();
 313
 314         /* We don't need to map the kernel through the TLB, as
 315          * it is permanatly mapped using P1. So clear the
 316          * entire pgd. */
 317         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 318
 319         /* Set an initial value for the MMU.TTB so we don't have to
 320          * check for a null value. */
 321         set_TTB(swapper_pg_dir);
 322
 323         /*
 324          * Populate the relevant portions of swapper_pg_dir so that
 325          * we can use the fixmap entries without calling kmalloc.
 326          * pte's will be filled in by __set_fixmap().
 327          */
 328         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 329         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 330         page_table_range_init(vaddr, end, swapper_pg_dir);
 331
 332         kmap_coherent_init();
 333
 334         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 335         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 336         free_area_init_nodes(max_zone_pfns);
 337 }
 338
 339 unsigned int mem_init_done = 0;
 340
 341 void __init mem_init(void)
 342 {
 343         pg_data_t *pgdat;
 344
 345         high_memory = NULL;
 346         for_each_online_pgdat(pgdat)
 347                 high_memory = max_t(void *, high_memory,
 348                                     __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
 349
 350         memblock_free_all();
 351
 352         /* Set this up early, so we can take care of the zero page */
 353         cpu_cache_init();
 354
 355         /* clear the zero-page */
 356         memset(empty_zero_page, 0, PAGE_SIZE);
 357         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 358
 359         vsyscall_init();
 360
 361         mem_init_print_info(NULL);
 362         pr_info("virtual kernel memory layout:\n"
 363                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 364 #ifdef CONFIG_HIGHMEM
 365                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 366 #endif
 367                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 368                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 369 #ifdef CONFIG_UNCACHED_MAPPING
 370                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 371 #endif
 372                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 373                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 374                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 375                 FIXADDR_START, FIXADDR_TOP,
 376                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 377
 378 #ifdef CONFIG_HIGHMEM
 379                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 380                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 381 #endif
 382
 383                 (unsigned long)VMALLOC_START, VMALLOC_END,
 384                 (VMALLOC_END - VMALLOC_START) >> 20,
 385
 386                 (unsigned long)memory_start, (unsigned long)high_memory,
 387                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 388
 389 #ifdef CONFIG_UNCACHED_MAPPING
 390                 uncached_start, uncached_end, uncached_size >> 20,
 391 #endif
 392
 393                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 394                 ((unsigned long)&__init_end -
 395                  (unsigned long)&__init_begin) >> 10,
 396
 397                 (unsigned long)&_etext, (unsigned long)&_edata,
 398                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 399
 400                 (unsigned long)&_text, (unsigned long)&_etext,
 401                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 402
 403         mem_init_done = 1;
 404 }
 405
 406 #ifdef CONFIG_MEMORY_HOTPLUG
 407 int arch_add_memory(int nid, u64 start, u64 size,
 408                         struct mhp_restrictions *restrictions)
 409 {
 410         unsigned long start_pfn = PFN_DOWN(start);
 411         unsigned long nr_pages = size >> PAGE_SHIFT;
 412         int ret;
 413
 414         /* We only have ZONE_NORMAL, so this is easy.. */
 415         ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
 416         if (unlikely(ret))
 417                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 418
 419         return ret;
 420 }
 421
 422 #ifdef CONFIG_NUMA
 423 int memory_add_physaddr_to_nid(u64 addr)
 424 {
 425         /* Node 0 for now.. */
 426         return 0;
 427 }
 428 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 429 #endif
 430
 431 #ifdef CONFIG_MEMORY_HOTREMOVE
 432 void arch_remove_memory(int nid, u64 start, u64 size,
 433                         struct vmem_altmap *altmap)
 434 {
 435         unsigned long start_pfn = PFN_DOWN(start);
 436         unsigned long nr_pages = size >> PAGE_SHIFT;
 437         struct zone *zone;
 438
 439         zone = page_zone(pfn_to_page(start_pfn));
 440         __remove_pages(zone, start_pfn, nr_pages, altmap);
 441 }
 442 #endif
 443 #endif /* CONFIG_MEMORY_HOTPLUG */