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