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