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