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         for_each_bank(i, mi) {
  70                 struct membank *bank = &mi->bank[i];
  71                 unsigned int pfn1, pfn2;
  72                 struct page *page, *end;
  73
  74                 pfn1 = bank_pfn_start(bank);
  75                 pfn2 = bank_pfn_end(bank);
  76
  77                 page = pfn_to_page(pfn1);
  78                 end  = pfn_to_page(pfn2 - 1) + 1;
  79
  80                 do {
  81                         total++;
  82                         if (PageReserved(page))
  83                                 reserved++;
  84                         else if (PageSwapCache(page))
  85                                 cached++;
  86                         else if (PageSlab(page))
  87                                 slab++;
  88                         else if (!page_count(page))
  89                                 free++;
  90                         else
  91                                 shared += page_count(page) - 1;
  92                         page++;
  93                 } while (page < end);
  94         }
  95
  96         printk(KERN_DEFAULT "%d pages of RAM\n", total);
  97         printk(KERN_DEFAULT "%d free pages\n", free);
  98         printk(KERN_DEFAULT "%d reserved pages\n", reserved);
  99         printk(KERN_DEFAULT "%d slab pages\n", slab);
 100         printk(KERN_DEFAULT "%d pages shared\n", shared);
 101         printk(KERN_DEFAULT "%d pages swap cached\n", cached);
 102 }
 103
 104 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 105         unsigned long *max_high)
 106 {
 107         struct meminfo *mi = &meminfo;
 108         int i;
 109
 110         *min = -1UL;
 111         *max_low = *max_high = 0;
 112
 113         for_each_bank(i, mi) {
 114                 struct membank *bank = &mi->bank[i];
 115                 unsigned long start, end;
 116
 117                 start = bank_pfn_start(bank);
 118                 end = bank_pfn_end(bank);
 119
 120                 if (*min > start)
 121                         *min = start;
 122                 if (*max_high < end)
 123                         *max_high = end;
 124                 if (bank->highmem)
 125                         continue;
 126                 if (*max_low < end)
 127                         *max_low = end;
 128         }
 129 }
 130
 131 static void __init uc32_bootmem_init(unsigned long start_pfn,
 132         unsigned long end_pfn)
 133 {
 134         struct memblock_region *reg;
 135         unsigned int boot_pages;
 136         phys_addr_t bitmap;
 137         pg_data_t *pgdat;
 138
 139         /*
 140          * Allocate the bootmem bitmap page.  This must be in a region
 141          * of memory which has already been mapped.
 142          */
 143         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 144         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 145                                 __pfn_to_phys(end_pfn));
 146
 147         /*
 148          * Initialise the bootmem allocator, handing the
 149          * memory banks over to bootmem.
 150          */
 151         node_set_online(0);
 152         pgdat = NODE_DATA(0);
 153         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 154
 155         /* Free the lowmem regions from memblock into bootmem. */
 156         for_each_memblock(memory, reg) {
 157                 unsigned long start = memblock_region_memory_base_pfn(reg);
 158                 unsigned long end = memblock_region_memory_end_pfn(reg);
 159
 160                 if (end >= end_pfn)
 161                         end = end_pfn;
 162                 if (start >= end)
 163                         break;
 164
 165                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 166         }
 167
 168         /* Reserve the lowmem memblock reserved regions in bootmem. */
 169         for_each_memblock(reserved, reg) {
 170                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 171                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 172
 173                 if (end >= end_pfn)
 174                         end = end_pfn;
 175                 if (start >= end)
 176                         break;
 177
 178                 reserve_bootmem(__pfn_to_phys(start),
 179                         (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 180         }
 181 }
 182
 183 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
 184         unsigned long max_high)
 185 {
 186         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 187         struct memblock_region *reg;
 188
 189         /*
 190          * initialise the zones.
 191          */
 192         memset(zone_size, 0, sizeof(zone_size));
 193
 194         /*
 195          * The memory size has already been determined.  If we need
 196          * to do anything fancy with the allocation of this memory
 197          * to the zones, now is the time to do it.
 198          */
 199         zone_size[0] = max_low - min;
 200
 201         /*
 202          * Calculate the size of the holes.
 203          *  holes = node_size - sum(bank_sizes)
 204          */
 205         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 206         for_each_memblock(memory, reg) {
 207                 unsigned long start = memblock_region_memory_base_pfn(reg);
 208                 unsigned long end = memblock_region_memory_end_pfn(reg);
 209
 210                 if (start < max_low) {
 211                         unsigned long low_end = min(end, max_low);
 212                         zhole_size[0] -= low_end - start;
 213                 }
 214         }
 215
 216         /*
 217          * Adjust the sizes according to any special requirements for
 218          * this machine type.
 219          */
 220         arch_adjust_zones(zone_size, zhole_size);
 221
 222         free_area_init_node(0, zone_size, min, zhole_size);
 223 }
 224
 225 int pfn_valid(unsigned long pfn)
 226 {
 227         return memblock_is_memory(pfn << PAGE_SHIFT);
 228 }
 229 EXPORT_SYMBOL(pfn_valid);
 230
 231 static void uc32_memory_present(void)
 232 {
 233 }
 234
 235 static int __init meminfo_cmp(const void *_a, const void *_b)
 236 {
 237         const struct membank *a = _a, *b = _b;
 238         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 239         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 240 }
 241
 242 void __init uc32_memblock_init(struct meminfo *mi)
 243 {
 244         int i;
 245
 246         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
 247                 meminfo_cmp, NULL);
 248
 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_allow_resize();
 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 void
 317 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 318 {
 319         struct page *start_pg, *end_pg;
 320         unsigned long pg, pgend;
 321
 322         /*
 323          * Convert start_pfn/end_pfn to a struct page pointer.
 324          */
 325         start_pg = pfn_to_page(start_pfn - 1) + 1;
 326         end_pg = pfn_to_page(end_pfn);
 327
 328         /*
 329          * Convert to physical addresses, and
 330          * round start upwards and end downwards.
 331          */
 332         pg = PAGE_ALIGN(__pa(start_pg));
 333         pgend = __pa(end_pg) & PAGE_MASK;
 334
 335         /*
 336          * If there are free pages between these,
 337          * free the section of the memmap array.
 338          */
 339         if (pg < pgend)
 340                 free_bootmem(pg, pgend - pg);
 341 }
 342
 343 /*
 344  * The mem_map array can get very big.  Free the unused area of the memory map.
 345  */
 346 static void __init free_unused_memmap(struct meminfo *mi)
 347 {
 348         unsigned long bank_start, prev_bank_end = 0;
 349         unsigned int i;
 350
 351         /*
 352          * This relies on each bank being in address order.
 353          * The banks are sorted previously in bootmem_init().
 354          */
 355         for_each_bank(i, mi) {
 356                 struct membank *bank = &mi->bank[i];
 357
 358                 bank_start = bank_pfn_start(bank);
 359
 360                 /*
 361                  * If we had a previous bank, and there is a space
 362                  * between the current bank and the previous, free it.
 363                  */
 364                 if (prev_bank_end && prev_bank_end < bank_start)
 365                         free_memmap(prev_bank_end, bank_start);
 366
 367                 /*
 368                  * Align up here since the VM subsystem insists that the
 369                  * memmap entries are valid from the bank end aligned to
 370                  * MAX_ORDER_NR_PAGES.
 371                  */
 372                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 373         }
 374 }
 375
 376 /*
 377  * mem_init() marks the free areas in the mem_map and tells us how much
 378  * memory is free.  This is done after various parts of the system have
 379  * claimed their memory after the kernel image.
 380  */
 381 void __init mem_init(void)
 382 {
 383         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 384
 385         free_unused_memmap(&meminfo);
 386
 387         /* this will put all unused low memory onto the freelists */
 388         free_all_bootmem();
 389
 390         mem_init_print_info(NULL);
 391         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 392                 "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 393                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 394                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 395                 "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 396                 "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 397                 "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 398                 "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 399
 400                 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
 401                 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
 402                 VMALLOC_START, VMALLOC_END,
 403                 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
 404                 PAGE_OFFSET, (unsigned long)high_memory,
 405                 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
 406                 MODULES_VADDR, MODULES_END,
 407                 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
 408
 409                 __init_begin, __init_end,
 410                 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
 411                 _stext, _etext,
 412                 DIV_ROUND_UP((_etext - _stext), SZ_1K),
 413                 _sdata, _edata,
 414                 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
 415
 416         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 417         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 418
 419         if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
 420                 /*
 421                  * On a machine this small we won't get
 422                  * anywhere without overcommit, so turn
 423                  * it on by default.
 424                  */
 425                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 426         }
 427 }
 428
 429 void free_initmem(void)
 430 {
 431         free_initmem_default(-1);
 432 }
 433
 434 #ifdef CONFIG_BLK_DEV_INITRD
 435
 436 static int keep_initrd;
 437
 438 void free_initrd_mem(unsigned long start, unsigned long end)
 439 {
 440         if (!keep_initrd)
 441                 free_reserved_area((void *)start, (void *)end, -1, "initrd");
 442 }
 443
 444 static int __init keepinitrd_setup(char *__unused)
 445 {
 446         keep_initrd = 1;
 447         return 1;
 448 }
 449
 450 __setup("keepinitrd", keepinitrd_setup);
 451 #endif