arch/unicore32/mm/init.c

   1 /*
   2  *  linux/arch/unicore32/mm/init.c
   3  *
   4  *  Copyright (C) 2010 GUAN Xue-tao
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/swap.h>
  13 #include <linux/init.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/mman.h>
  16 #include <linux/nodemask.h>
  17 #include <linux/initrd.h>
  18 #include <linux/highmem.h>
  19 #include <linux/gfp.h>
  20 #include <linux/memblock.h>
  21 #include <linux/sort.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/export.h>
  24
  25 #include <asm/sections.h>
  26 #include <asm/setup.h>
  27 #include <asm/sizes.h>
  28 #include <asm/tlb.h>
  29 #include <mach/map.h>
  30
  31 #include "mm.h"
  32
  33 static unsigned long phys_initrd_start __initdata = 0x01000000;
  34 static unsigned long phys_initrd_size __initdata = SZ_8M;
  35
  36 static int __init early_initrd(char *p)
  37 {
  38         unsigned long start, size;
  39         char *endp;
  40
  41         start = memparse(p, &endp);
  42         if (*endp == ',') {
  43                 size = memparse(endp + 1, NULL);
  44
  45                 phys_initrd_start = start;
  46                 phys_initrd_size = size;
  47         }
  48         return 0;
  49 }
  50 early_param("initrd", early_initrd);
  51
  52 /*
  53  * This keeps memory configuration data used by a couple memory
  54  * initialization functions, as well as show_mem() for the skipping
  55  * of holes in the memory map.  It is populated by uc32_add_memory().
  56  */
  57 struct meminfo meminfo;
  58
  59 void show_mem(unsigned int filter)
  60 {
  61         int free = 0, total = 0, reserved = 0;
  62         int shared = 0, cached = 0, slab = 0, i;
  63         struct meminfo *mi = &meminfo;
  64
  65         printk(KERN_DEFAULT "Mem-info:\n");
  66         show_free_areas(filter);
  67
  68         for_each_bank(i, mi) {
  69                 struct membank *bank = &mi->bank[i];
  70                 unsigned int pfn1, pfn2;
  71                 struct page *page, *end;
  72
  73                 pfn1 = bank_pfn_start(bank);
  74                 pfn2 = bank_pfn_end(bank);
  75
  76                 page = pfn_to_page(pfn1);
  77                 end  = pfn_to_page(pfn2 - 1) + 1;
  78
  79                 do {
  80                         total++;
  81                         if (PageReserved(page))
  82                                 reserved++;
  83                         else if (PageSwapCache(page))
  84                                 cached++;
  85                         else if (PageSlab(page))
  86                                 slab++;
  87                         else if (!page_count(page))
  88                                 free++;
  89                         else
  90                                 shared += page_count(page) - 1;
  91                         page++;
  92                 } while (page < end);
  93         }
  94
  95         printk(KERN_DEFAULT "%d pages of RAM\n", total);
  96         printk(KERN_DEFAULT "%d free pages\n", free);
  97         printk(KERN_DEFAULT "%d reserved pages\n", reserved);
  98         printk(KERN_DEFAULT "%d slab pages\n", slab);
  99         printk(KERN_DEFAULT "%d pages shared\n", shared);
 100         printk(KERN_DEFAULT "%d pages swap cached\n", cached);
 101 }
 102
 103 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 104         unsigned long *max_high)
 105 {
 106         struct meminfo *mi = &meminfo;
 107         int i;
 108
 109         *min = -1UL;
 110         *max_low = *max_high = 0;
 111
 112         for_each_bank(i, mi) {
 113                 struct membank *bank = &mi->bank[i];
 114                 unsigned long start, end;
 115
 116                 start = bank_pfn_start(bank);
 117                 end = bank_pfn_end(bank);
 118
 119                 if (*min > start)
 120                         *min = start;
 121                 if (*max_high < end)
 122                         *max_high = end;
 123                 if (bank->highmem)
 124                         continue;
 125                 if (*max_low < end)
 126                         *max_low = end;
 127         }
 128 }
 129
 130 static void __init uc32_bootmem_init(unsigned long start_pfn,
 131         unsigned long end_pfn)
 132 {
 133         struct memblock_region *reg;
 134         unsigned int boot_pages;
 135         phys_addr_t bitmap;
 136         pg_data_t *pgdat;
 137
 138         /*
 139          * Allocate the bootmem bitmap page.  This must be in a region
 140          * of memory which has already been mapped.
 141          */
 142         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 143         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 144                                 __pfn_to_phys(end_pfn));
 145
 146         /*
 147          * Initialise the bootmem allocator, handing the
 148          * memory banks over to bootmem.
 149          */
 150         node_set_online(0);
 151         pgdat = NODE_DATA(0);
 152         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 153
 154         /* Free the lowmem regions from memblock into bootmem. */
 155         for_each_memblock(memory, reg) {
 156                 unsigned long start = memblock_region_memory_base_pfn(reg);
 157                 unsigned long end = memblock_region_memory_end_pfn(reg);
 158
 159                 if (end >= end_pfn)
 160                         end = end_pfn;
 161                 if (start >= end)
 162                         break;
 163
 164                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 165         }
 166
 167         /* Reserve the lowmem memblock reserved regions in bootmem. */
 168         for_each_memblock(reserved, reg) {
 169                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 170                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 171
 172                 if (end >= end_pfn)
 173                         end = end_pfn;
 174                 if (start >= end)
 175                         break;
 176
 177                 reserve_bootmem(__pfn_to_phys(start),
 178                         (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 179         }
 180 }
 181
 182 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
 183         unsigned long max_high)
 184 {
 185         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 186         struct memblock_region *reg;
 187
 188         /*
 189          * initialise the zones.
 190          */
 191         memset(zone_size, 0, sizeof(zone_size));
 192
 193         /*
 194          * The memory size has already been determined.  If we need
 195          * to do anything fancy with the allocation of this memory
 196          * to the zones, now is the time to do it.
 197          */
 198         zone_size[0] = max_low - min;
 199
 200         /*
 201          * Calculate the size of the holes.
 202          *  holes = node_size - sum(bank_sizes)
 203          */
 204         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 205         for_each_memblock(memory, reg) {
 206                 unsigned long start = memblock_region_memory_base_pfn(reg);
 207                 unsigned long end = memblock_region_memory_end_pfn(reg);
 208
 209                 if (start < max_low) {
 210                         unsigned long low_end = min(end, max_low);
 211                         zhole_size[0] -= low_end - start;
 212                 }
 213         }
 214
 215         /*
 216          * Adjust the sizes according to any special requirements for
 217          * this machine type.
 218          */
 219         arch_adjust_zones(zone_size, zhole_size);
 220
 221         free_area_init_node(0, zone_size, min, zhole_size);
 222 }
 223
 224 int pfn_valid(unsigned long pfn)
 225 {
 226         return memblock_is_memory(pfn << PAGE_SHIFT);
 227 }
 228 EXPORT_SYMBOL(pfn_valid);
 229
 230 static void uc32_memory_present(void)
 231 {
 232 }
 233
 234 static int __init meminfo_cmp(const void *_a, const void *_b)
 235 {
 236         const struct membank *a = _a, *b = _b;
 237         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 238         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 239 }
 240
 241 void __init uc32_memblock_init(struct meminfo *mi)
 242 {
 243         int i;
 244
 245         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
 246                 meminfo_cmp, NULL);
 247
 248         memblock_init();
 249         for (i = 0; i < mi->nr_banks; i++)
 250                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 251
 252         /* Register the kernel text, kernel data and initrd with memblock. */
 253         memblock_reserve(__pa(_text), _end - _text);
 254
 255 #ifdef CONFIG_BLK_DEV_INITRD
 256         if (phys_initrd_size) {
 257                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 258
 259                 /* Now convert initrd to virtual addresses */
 260                 initrd_start = __phys_to_virt(phys_initrd_start);
 261                 initrd_end = initrd_start + phys_initrd_size;
 262         }
 263 #endif
 264
 265         uc32_mm_memblock_reserve();
 266
 267         memblock_analyze();
 268         memblock_dump_all();
 269 }
 270
 271 void __init bootmem_init(void)
 272 {
 273         unsigned long min, max_low, max_high;
 274
 275         max_low = max_high = 0;
 276
 277         find_limits(&min, &max_low, &max_high);
 278
 279         uc32_bootmem_init(min, max_low);
 280
 281 #ifdef CONFIG_SWIOTLB
 282         swiotlb_init(1);
 283 #endif
 284         /*
 285          * Sparsemem tries to allocate bootmem in memory_present(),
 286          * so must be done after the fixed reservations
 287          */
 288         uc32_memory_present();
 289
 290         /*
 291          * sparse_init() needs the bootmem allocator up and running.
 292          */
 293         sparse_init();
 294
 295         /*
 296          * Now free the memory - free_area_init_node needs
 297          * the sparse mem_map arrays initialized by sparse_init()
 298          * for memmap_init_zone(), otherwise all PFNs are invalid.
 299          */
 300         uc32_bootmem_free(min, max_low, max_high);
 301
 302         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 303
 304         /*
 305          * This doesn't seem to be used by the Linux memory manager any
 306          * more, but is used by ll_rw_block.  If we can get rid of it, we
 307          * also get rid of some of the stuff above as well.
 308          *
 309          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 310          * the system, not the maximum PFN.
 311          */
 312         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 313         max_pfn = max_high - PHYS_PFN_OFFSET;
 314 }
 315
 316 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 317 {
 318         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 319
 320         for (; pfn < end; pfn++) {
 321                 struct page *page = pfn_to_page(pfn);
 322                 ClearPageReserved(page);
 323                 init_page_count(page);
 324                 __free_page(page);
 325                 pages++;
 326         }
 327
 328         if (size && s)
 329                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 330
 331         return pages;
 332 }
 333
 334 static inline void
 335 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 336 {
 337         struct page *start_pg, *end_pg;
 338         unsigned long pg, pgend;
 339
 340         /*
 341          * Convert start_pfn/end_pfn to a struct page pointer.
 342          */
 343         start_pg = pfn_to_page(start_pfn - 1) + 1;
 344         end_pg = pfn_to_page(end_pfn);
 345
 346         /*
 347          * Convert to physical addresses, and
 348          * round start upwards and end downwards.
 349          */
 350         pg = PAGE_ALIGN(__pa(start_pg));
 351         pgend = __pa(end_pg) & PAGE_MASK;
 352
 353         /*
 354          * If there are free pages between these,
 355          * free the section of the memmap array.
 356          */
 357         if (pg < pgend)
 358                 free_bootmem(pg, pgend - pg);
 359 }
 360
 361 /*
 362  * The mem_map array can get very big.  Free the unused area of the memory map.
 363  */
 364 static void __init free_unused_memmap(struct meminfo *mi)
 365 {
 366         unsigned long bank_start, prev_bank_end = 0;
 367         unsigned int i;
 368
 369         /*
 370          * This relies on each bank being in address order.
 371          * The banks are sorted previously in bootmem_init().
 372          */
 373         for_each_bank(i, mi) {
 374                 struct membank *bank = &mi->bank[i];
 375
 376                 bank_start = bank_pfn_start(bank);
 377
 378                 /*
 379                  * If we had a previous bank, and there is a space
 380                  * between the current bank and the previous, free it.
 381                  */
 382                 if (prev_bank_end && prev_bank_end < bank_start)
 383                         free_memmap(prev_bank_end, bank_start);
 384
 385                 /*
 386                  * Align up here since the VM subsystem insists that the
 387                  * memmap entries are valid from the bank end aligned to
 388                  * MAX_ORDER_NR_PAGES.
 389                  */
 390                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 391         }
 392 }
 393
 394 /*
 395  * mem_init() marks the free areas in the mem_map and tells us how much
 396  * memory is free.  This is done after various parts of the system have
 397  * claimed their memory after the kernel image.
 398  */
 399 void __init mem_init(void)
 400 {
 401         unsigned long reserved_pages, free_pages;
 402         struct memblock_region *reg;
 403         int i;
 404
 405         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 406
 407         /* this will put all unused low memory onto the freelists */
 408         free_unused_memmap(&meminfo);
 409
 410         totalram_pages += free_all_bootmem();
 411
 412         reserved_pages = free_pages = 0;
 413
 414         for_each_bank(i, &meminfo) {
 415                 struct membank *bank = &meminfo.bank[i];
 416                 unsigned int pfn1, pfn2;
 417                 struct page *page, *end;
 418
 419                 pfn1 = bank_pfn_start(bank);
 420                 pfn2 = bank_pfn_end(bank);
 421
 422                 page = pfn_to_page(pfn1);
 423                 end  = pfn_to_page(pfn2 - 1) + 1;
 424
 425                 do {
 426                         if (PageReserved(page))
 427                                 reserved_pages++;
 428                         else if (!page_count(page))
 429                                 free_pages++;
 430                         page++;
 431                 } while (page < end);
 432         }
 433
 434         /*
 435          * Since our memory may not be contiguous, calculate the
 436          * real number of pages we have in this system
 437          */
 438         printk(KERN_INFO "Memory:");
 439         num_physpages = 0;
 440         for_each_memblock(memory, reg) {
 441                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 442                         memblock_region_memory_base_pfn(reg);
 443                 num_physpages += pages;
 444                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 445         }
 446         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 447
 448         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 449                 nr_free_pages() << (PAGE_SHIFT-10),
 450                 free_pages << (PAGE_SHIFT-10),
 451                 reserved_pages << (PAGE_SHIFT-10),
 452                 totalhigh_pages << (PAGE_SHIFT-10));
 453
 454         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 455                 "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 456                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 457                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 458                 "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 459                 "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 460                 "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 461                 "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 462
 463                 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
 464                 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
 465                 VMALLOC_START, VMALLOC_END,
 466                 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
 467                 PAGE_OFFSET, (unsigned long)high_memory,
 468                 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
 469                 MODULES_VADDR, MODULES_END,
 470                 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
 471
 472                 __init_begin, __init_end,
 473                 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
 474                 _stext, _etext,
 475                 DIV_ROUND_UP((_etext - _stext), SZ_1K),
 476                 _sdata, _edata,
 477                 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
 478
 479         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 480         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 481
 482         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 483                 /*
 484                  * On a machine this small we won't get
 485                  * anywhere without overcommit, so turn
 486                  * it on by default.
 487                  */
 488                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 489         }
 490 }
 491
 492 void free_initmem(void)
 493 {
 494         totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 495                                     __phys_to_pfn(__pa(__init_end)),
 496                                     "init");
 497 }
 498
 499 #ifdef CONFIG_BLK_DEV_INITRD
 500
 501 static int keep_initrd;
 502
 503 void free_initrd_mem(unsigned long start, unsigned long end)
 504 {
 505         if (!keep_initrd)
 506                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 507                                             __phys_to_pfn(__pa(end)),
 508                                             "initrd");
 509 }
 510
 511 static int __init keepinitrd_setup(char *__unused)
 512 {
 513         keep_initrd = 1;
 514         return 1;
 515 }
 516
 517 __setup("keepinitrd", keepinitrd_setup);
 518 #endif