| 1 | /* |
| 2 | * linux/arch/arm/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995-2005 Russell King |
| 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/of_fdt.h> |
| 19 | #include <linux/highmem.h> |
| 20 | #include <linux/gfp.h> |
| 21 | #include <linux/memblock.h> |
| 22 | #include <linux/sort.h> |
| 23 | |
| 24 | #include <asm/mach-types.h> |
| 25 | #include <asm/prom.h> |
| 26 | #include <asm/sections.h> |
| 27 | #include <asm/setup.h> |
| 28 | #include <asm/sizes.h> |
| 29 | #include <asm/tlb.h> |
| 30 | #include <asm/fixmap.h> |
| 31 | |
| 32 | #include <asm/mach/arch.h> |
| 33 | #include <asm/mach/map.h> |
| 34 | |
| 35 | #include "mm.h" |
| 36 | |
| 37 | static unsigned long phys_initrd_start __initdata = 0; |
| 38 | static unsigned long phys_initrd_size __initdata = 0; |
| 39 | |
| 40 | static int __init early_initrd(char *p) |
| 41 | { |
| 42 | unsigned long start, size; |
| 43 | char *endp; |
| 44 | |
| 45 | start = memparse(p, &endp); |
| 46 | if (*endp == ',') { |
| 47 | size = memparse(endp + 1, NULL); |
| 48 | |
| 49 | phys_initrd_start = start; |
| 50 | phys_initrd_size = size; |
| 51 | } |
| 52 | return 0; |
| 53 | } |
| 54 | early_param("initrd", early_initrd); |
| 55 | |
| 56 | static int __init parse_tag_initrd(const struct tag *tag) |
| 57 | { |
| 58 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " |
| 59 | "please update your bootloader.\n"); |
| 60 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
| 61 | phys_initrd_size = tag->u.initrd.size; |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | __tagtable(ATAG_INITRD, parse_tag_initrd); |
| 66 | |
| 67 | static int __init parse_tag_initrd2(const struct tag *tag) |
| 68 | { |
| 69 | phys_initrd_start = tag->u.initrd.start; |
| 70 | phys_initrd_size = tag->u.initrd.size; |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
| 75 | |
| 76 | #ifdef CONFIG_OF_FLATTREE |
| 77 | void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) |
| 78 | { |
| 79 | phys_initrd_start = start; |
| 80 | phys_initrd_size = end - start; |
| 81 | } |
| 82 | #endif /* CONFIG_OF_FLATTREE */ |
| 83 | |
| 84 | /* |
| 85 | * This keeps memory configuration data used by a couple memory |
| 86 | * initialization functions, as well as show_mem() for the skipping |
| 87 | * of holes in the memory map. It is populated by arm_add_memory(). |
| 88 | */ |
| 89 | struct meminfo meminfo; |
| 90 | |
| 91 | void show_mem(unsigned int filter) |
| 92 | { |
| 93 | int free = 0, total = 0, reserved = 0; |
| 94 | int shared = 0, cached = 0, slab = 0, i; |
| 95 | struct meminfo * mi = &meminfo; |
| 96 | |
| 97 | printk("Mem-info:\n"); |
| 98 | show_free_areas(filter); |
| 99 | |
| 100 | for_each_bank (i, mi) { |
| 101 | struct membank *bank = &mi->bank[i]; |
| 102 | unsigned int pfn1, pfn2; |
| 103 | struct page *page, *end; |
| 104 | |
| 105 | pfn1 = bank_pfn_start(bank); |
| 106 | pfn2 = bank_pfn_end(bank); |
| 107 | |
| 108 | page = pfn_to_page(pfn1); |
| 109 | end = pfn_to_page(pfn2 - 1) + 1; |
| 110 | |
| 111 | do { |
| 112 | total++; |
| 113 | if (PageReserved(page)) |
| 114 | reserved++; |
| 115 | else if (PageSwapCache(page)) |
| 116 | cached++; |
| 117 | else if (PageSlab(page)) |
| 118 | slab++; |
| 119 | else if (!page_count(page)) |
| 120 | free++; |
| 121 | else |
| 122 | shared += page_count(page) - 1; |
| 123 | page++; |
| 124 | } while (page < end); |
| 125 | } |
| 126 | |
| 127 | printk("%d pages of RAM\n", total); |
| 128 | printk("%d free pages\n", free); |
| 129 | printk("%d reserved pages\n", reserved); |
| 130 | printk("%d slab pages\n", slab); |
| 131 | printk("%d pages shared\n", shared); |
| 132 | printk("%d pages swap cached\n", cached); |
| 133 | } |
| 134 | |
| 135 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
| 136 | unsigned long *max_high) |
| 137 | { |
| 138 | struct meminfo *mi = &meminfo; |
| 139 | int i; |
| 140 | |
| 141 | *min = -1UL; |
| 142 | *max_low = *max_high = 0; |
| 143 | |
| 144 | for_each_bank (i, mi) { |
| 145 | struct membank *bank = &mi->bank[i]; |
| 146 | unsigned long start, end; |
| 147 | |
| 148 | start = bank_pfn_start(bank); |
| 149 | end = bank_pfn_end(bank); |
| 150 | |
| 151 | if (*min > start) |
| 152 | *min = start; |
| 153 | if (*max_high < end) |
| 154 | *max_high = end; |
| 155 | if (bank->highmem) |
| 156 | continue; |
| 157 | if (*max_low < end) |
| 158 | *max_low = end; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | static void __init arm_bootmem_init(unsigned long start_pfn, |
| 163 | unsigned long end_pfn) |
| 164 | { |
| 165 | struct memblock_region *reg; |
| 166 | unsigned int boot_pages; |
| 167 | phys_addr_t bitmap; |
| 168 | pg_data_t *pgdat; |
| 169 | |
| 170 | /* |
| 171 | * Allocate the bootmem bitmap page. This must be in a region |
| 172 | * of memory which has already been mapped. |
| 173 | */ |
| 174 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); |
| 175 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
| 176 | __pfn_to_phys(end_pfn)); |
| 177 | |
| 178 | /* |
| 179 | * Initialise the bootmem allocator, handing the |
| 180 | * memory banks over to bootmem. |
| 181 | */ |
| 182 | node_set_online(0); |
| 183 | pgdat = NODE_DATA(0); |
| 184 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
| 185 | |
| 186 | /* Free the lowmem regions from memblock into bootmem. */ |
| 187 | for_each_memblock(memory, reg) { |
| 188 | unsigned long start = memblock_region_memory_base_pfn(reg); |
| 189 | unsigned long end = memblock_region_memory_end_pfn(reg); |
| 190 | |
| 191 | if (end >= end_pfn) |
| 192 | end = end_pfn; |
| 193 | if (start >= end) |
| 194 | break; |
| 195 | |
| 196 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); |
| 197 | } |
| 198 | |
| 199 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
| 200 | for_each_memblock(reserved, reg) { |
| 201 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
| 202 | unsigned long end = memblock_region_reserved_end_pfn(reg); |
| 203 | |
| 204 | if (end >= end_pfn) |
| 205 | end = end_pfn; |
| 206 | if (start >= end) |
| 207 | break; |
| 208 | |
| 209 | reserve_bootmem(__pfn_to_phys(start), |
| 210 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | #ifdef CONFIG_ZONE_DMA |
| 215 | |
| 216 | unsigned long arm_dma_zone_size __read_mostly; |
| 217 | EXPORT_SYMBOL(arm_dma_zone_size); |
| 218 | |
| 219 | /* |
| 220 | * The DMA mask corresponding to the maximum bus address allocatable |
| 221 | * using GFP_DMA. The default here places no restriction on DMA |
| 222 | * allocations. This must be the smallest DMA mask in the system, |
| 223 | * so a successful GFP_DMA allocation will always satisfy this. |
| 224 | */ |
| 225 | u32 arm_dma_limit; |
| 226 | |
| 227 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
| 228 | unsigned long dma_size) |
| 229 | { |
| 230 | if (size[0] <= dma_size) |
| 231 | return; |
| 232 | |
| 233 | size[ZONE_NORMAL] = size[0] - dma_size; |
| 234 | size[ZONE_DMA] = dma_size; |
| 235 | hole[ZONE_NORMAL] = hole[0]; |
| 236 | hole[ZONE_DMA] = 0; |
| 237 | } |
| 238 | #endif |
| 239 | |
| 240 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
| 241 | unsigned long max_high) |
| 242 | { |
| 243 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
| 244 | struct memblock_region *reg; |
| 245 | |
| 246 | /* |
| 247 | * initialise the zones. |
| 248 | */ |
| 249 | memset(zone_size, 0, sizeof(zone_size)); |
| 250 | |
| 251 | /* |
| 252 | * The memory size has already been determined. If we need |
| 253 | * to do anything fancy with the allocation of this memory |
| 254 | * to the zones, now is the time to do it. |
| 255 | */ |
| 256 | zone_size[0] = max_low - min; |
| 257 | #ifdef CONFIG_HIGHMEM |
| 258 | zone_size[ZONE_HIGHMEM] = max_high - max_low; |
| 259 | #endif |
| 260 | |
| 261 | /* |
| 262 | * Calculate the size of the holes. |
| 263 | * holes = node_size - sum(bank_sizes) |
| 264 | */ |
| 265 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
| 266 | for_each_memblock(memory, reg) { |
| 267 | unsigned long start = memblock_region_memory_base_pfn(reg); |
| 268 | unsigned long end = memblock_region_memory_end_pfn(reg); |
| 269 | |
| 270 | if (start < max_low) { |
| 271 | unsigned long low_end = min(end, max_low); |
| 272 | zhole_size[0] -= low_end - start; |
| 273 | } |
| 274 | #ifdef CONFIG_HIGHMEM |
| 275 | if (end > max_low) { |
| 276 | unsigned long high_start = max(start, max_low); |
| 277 | zhole_size[ZONE_HIGHMEM] -= end - high_start; |
| 278 | } |
| 279 | #endif |
| 280 | } |
| 281 | |
| 282 | #ifdef CONFIG_ZONE_DMA |
| 283 | /* |
| 284 | * Adjust the sizes according to any special requirements for |
| 285 | * this machine type. |
| 286 | */ |
| 287 | if (arm_dma_zone_size) { |
| 288 | arm_adjust_dma_zone(zone_size, zhole_size, |
| 289 | arm_dma_zone_size >> PAGE_SHIFT); |
| 290 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
| 291 | } else |
| 292 | arm_dma_limit = 0xffffffff; |
| 293 | #endif |
| 294 | |
| 295 | free_area_init_node(0, zone_size, min, zhole_size); |
| 296 | } |
| 297 | |
| 298 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
| 299 | int pfn_valid(unsigned long pfn) |
| 300 | { |
| 301 | return memblock_is_memory(pfn << PAGE_SHIFT); |
| 302 | } |
| 303 | EXPORT_SYMBOL(pfn_valid); |
| 304 | #endif |
| 305 | |
| 306 | #ifndef CONFIG_SPARSEMEM |
| 307 | static void arm_memory_present(void) |
| 308 | { |
| 309 | } |
| 310 | #else |
| 311 | static void arm_memory_present(void) |
| 312 | { |
| 313 | struct memblock_region *reg; |
| 314 | |
| 315 | for_each_memblock(memory, reg) |
| 316 | memory_present(0, memblock_region_memory_base_pfn(reg), |
| 317 | memblock_region_memory_end_pfn(reg)); |
| 318 | } |
| 319 | #endif |
| 320 | |
| 321 | static int __init meminfo_cmp(const void *_a, const void *_b) |
| 322 | { |
| 323 | const struct membank *a = _a, *b = _b; |
| 324 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); |
| 325 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; |
| 326 | } |
| 327 | |
| 328 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
| 329 | { |
| 330 | int i; |
| 331 | |
| 332 | sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
| 333 | |
| 334 | memblock_init(); |
| 335 | for (i = 0; i < mi->nr_banks; i++) |
| 336 | memblock_add(mi->bank[i].start, mi->bank[i].size); |
| 337 | |
| 338 | /* Register the kernel text, kernel data and initrd with memblock. */ |
| 339 | #ifdef CONFIG_XIP_KERNEL |
| 340 | memblock_reserve(__pa(_sdata), _end - _sdata); |
| 341 | #else |
| 342 | memblock_reserve(__pa(_stext), _end - _stext); |
| 343 | #endif |
| 344 | #ifdef CONFIG_BLK_DEV_INITRD |
| 345 | if (phys_initrd_size && |
| 346 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { |
| 347 | pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", |
| 348 | phys_initrd_start, phys_initrd_size); |
| 349 | phys_initrd_start = phys_initrd_size = 0; |
| 350 | } |
| 351 | if (phys_initrd_size && |
| 352 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { |
| 353 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
| 354 | phys_initrd_start, phys_initrd_size); |
| 355 | phys_initrd_start = phys_initrd_size = 0; |
| 356 | } |
| 357 | if (phys_initrd_size) { |
| 358 | memblock_reserve(phys_initrd_start, phys_initrd_size); |
| 359 | |
| 360 | /* Now convert initrd to virtual addresses */ |
| 361 | initrd_start = __phys_to_virt(phys_initrd_start); |
| 362 | initrd_end = initrd_start + phys_initrd_size; |
| 363 | } |
| 364 | #endif |
| 365 | |
| 366 | arm_mm_memblock_reserve(); |
| 367 | arm_dt_memblock_reserve(); |
| 368 | |
| 369 | /* reserve any platform specific memblock areas */ |
| 370 | if (mdesc->reserve) |
| 371 | mdesc->reserve(); |
| 372 | |
| 373 | memblock_analyze(); |
| 374 | memblock_dump_all(); |
| 375 | } |
| 376 | |
| 377 | void __init bootmem_init(void) |
| 378 | { |
| 379 | unsigned long min, max_low, max_high; |
| 380 | |
| 381 | max_low = max_high = 0; |
| 382 | |
| 383 | find_limits(&min, &max_low, &max_high); |
| 384 | |
| 385 | arm_bootmem_init(min, max_low); |
| 386 | |
| 387 | /* |
| 388 | * Sparsemem tries to allocate bootmem in memory_present(), |
| 389 | * so must be done after the fixed reservations |
| 390 | */ |
| 391 | arm_memory_present(); |
| 392 | |
| 393 | /* |
| 394 | * sparse_init() needs the bootmem allocator up and running. |
| 395 | */ |
| 396 | sparse_init(); |
| 397 | |
| 398 | /* |
| 399 | * Now free the memory - free_area_init_node needs |
| 400 | * the sparse mem_map arrays initialized by sparse_init() |
| 401 | * for memmap_init_zone(), otherwise all PFNs are invalid. |
| 402 | */ |
| 403 | arm_bootmem_free(min, max_low, max_high); |
| 404 | |
| 405 | high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; |
| 406 | |
| 407 | /* |
| 408 | * This doesn't seem to be used by the Linux memory manager any |
| 409 | * more, but is used by ll_rw_block. If we can get rid of it, we |
| 410 | * also get rid of some of the stuff above as well. |
| 411 | * |
| 412 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
| 413 | * the system, not the maximum PFN. |
| 414 | */ |
| 415 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
| 416 | max_pfn = max_high - PHYS_PFN_OFFSET; |
| 417 | } |
| 418 | |
| 419 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
| 420 | { |
| 421 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
| 422 | |
| 423 | for (; pfn < end; pfn++) { |
| 424 | struct page *page = pfn_to_page(pfn); |
| 425 | ClearPageReserved(page); |
| 426 | init_page_count(page); |
| 427 | __free_page(page); |
| 428 | pages++; |
| 429 | } |
| 430 | |
| 431 | if (size && s) |
| 432 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); |
| 433 | |
| 434 | return pages; |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Poison init memory with an undefined instruction (ARM) or a branch to an |
| 439 | * undefined instruction (Thumb). |
| 440 | */ |
| 441 | static inline void poison_init_mem(void *s, size_t count) |
| 442 | { |
| 443 | u32 *p = (u32 *)s; |
| 444 | while ((count = count - 4)) |
| 445 | *p++ = 0xe7fddef0; |
| 446 | } |
| 447 | |
| 448 | static inline void |
| 449 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
| 450 | { |
| 451 | struct page *start_pg, *end_pg; |
| 452 | unsigned long pg, pgend; |
| 453 | |
| 454 | /* |
| 455 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 456 | */ |
| 457 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
| 458 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
| 459 | |
| 460 | /* |
| 461 | * Convert to physical addresses, and |
| 462 | * round start upwards and end downwards. |
| 463 | */ |
| 464 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
| 465 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; |
| 466 | |
| 467 | /* |
| 468 | * If there are free pages between these, |
| 469 | * free the section of the memmap array. |
| 470 | */ |
| 471 | if (pg < pgend) |
| 472 | free_bootmem(pg, pgend - pg); |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 477 | */ |
| 478 | static void __init free_unused_memmap(struct meminfo *mi) |
| 479 | { |
| 480 | unsigned long bank_start, prev_bank_end = 0; |
| 481 | unsigned int i; |
| 482 | |
| 483 | /* |
| 484 | * This relies on each bank being in address order. |
| 485 | * The banks are sorted previously in bootmem_init(). |
| 486 | */ |
| 487 | for_each_bank(i, mi) { |
| 488 | struct membank *bank = &mi->bank[i]; |
| 489 | |
| 490 | bank_start = bank_pfn_start(bank); |
| 491 | |
| 492 | #ifdef CONFIG_SPARSEMEM |
| 493 | /* |
| 494 | * Take care not to free memmap entries that don't exist |
| 495 | * due to SPARSEMEM sections which aren't present. |
| 496 | */ |
| 497 | bank_start = min(bank_start, |
| 498 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); |
| 499 | #endif |
| 500 | /* |
| 501 | * If we had a previous bank, and there is a space |
| 502 | * between the current bank and the previous, free it. |
| 503 | */ |
| 504 | if (prev_bank_end && prev_bank_end < bank_start) |
| 505 | free_memmap(prev_bank_end, bank_start); |
| 506 | |
| 507 | /* |
| 508 | * Align up here since the VM subsystem insists that the |
| 509 | * memmap entries are valid from the bank end aligned to |
| 510 | * MAX_ORDER_NR_PAGES. |
| 511 | */ |
| 512 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); |
| 513 | } |
| 514 | |
| 515 | #ifdef CONFIG_SPARSEMEM |
| 516 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) |
| 517 | free_memmap(prev_bank_end, |
| 518 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); |
| 519 | #endif |
| 520 | } |
| 521 | |
| 522 | static void __init free_highpages(void) |
| 523 | { |
| 524 | #ifdef CONFIG_HIGHMEM |
| 525 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
| 526 | struct memblock_region *mem, *res; |
| 527 | |
| 528 | /* set highmem page free */ |
| 529 | for_each_memblock(memory, mem) { |
| 530 | unsigned long start = memblock_region_memory_base_pfn(mem); |
| 531 | unsigned long end = memblock_region_memory_end_pfn(mem); |
| 532 | |
| 533 | /* Ignore complete lowmem entries */ |
| 534 | if (end <= max_low) |
| 535 | continue; |
| 536 | |
| 537 | /* Truncate partial highmem entries */ |
| 538 | if (start < max_low) |
| 539 | start = max_low; |
| 540 | |
| 541 | /* Find and exclude any reserved regions */ |
| 542 | for_each_memblock(reserved, res) { |
| 543 | unsigned long res_start, res_end; |
| 544 | |
| 545 | res_start = memblock_region_reserved_base_pfn(res); |
| 546 | res_end = memblock_region_reserved_end_pfn(res); |
| 547 | |
| 548 | if (res_end < start) |
| 549 | continue; |
| 550 | if (res_start < start) |
| 551 | res_start = start; |
| 552 | if (res_start > end) |
| 553 | res_start = end; |
| 554 | if (res_end > end) |
| 555 | res_end = end; |
| 556 | if (res_start != start) |
| 557 | totalhigh_pages += free_area(start, res_start, |
| 558 | NULL); |
| 559 | start = res_end; |
| 560 | if (start == end) |
| 561 | break; |
| 562 | } |
| 563 | |
| 564 | /* And now free anything which remains */ |
| 565 | if (start < end) |
| 566 | totalhigh_pages += free_area(start, end, NULL); |
| 567 | } |
| 568 | totalram_pages += totalhigh_pages; |
| 569 | #endif |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * mem_init() marks the free areas in the mem_map and tells us how much |
| 574 | * memory is free. This is done after various parts of the system have |
| 575 | * claimed their memory after the kernel image. |
| 576 | */ |
| 577 | void __init mem_init(void) |
| 578 | { |
| 579 | unsigned long reserved_pages, free_pages; |
| 580 | struct memblock_region *reg; |
| 581 | int i; |
| 582 | #ifdef CONFIG_HAVE_TCM |
| 583 | /* These pointers are filled in on TCM detection */ |
| 584 | extern u32 dtcm_end; |
| 585 | extern u32 itcm_end; |
| 586 | #endif |
| 587 | |
| 588 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
| 589 | |
| 590 | /* this will put all unused low memory onto the freelists */ |
| 591 | free_unused_memmap(&meminfo); |
| 592 | |
| 593 | totalram_pages += free_all_bootmem(); |
| 594 | |
| 595 | #ifdef CONFIG_SA1111 |
| 596 | /* now that our DMA memory is actually so designated, we can free it */ |
| 597 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
| 598 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); |
| 599 | #endif |
| 600 | |
| 601 | free_highpages(); |
| 602 | |
| 603 | reserved_pages = free_pages = 0; |
| 604 | |
| 605 | for_each_bank(i, &meminfo) { |
| 606 | struct membank *bank = &meminfo.bank[i]; |
| 607 | unsigned int pfn1, pfn2; |
| 608 | struct page *page, *end; |
| 609 | |
| 610 | pfn1 = bank_pfn_start(bank); |
| 611 | pfn2 = bank_pfn_end(bank); |
| 612 | |
| 613 | page = pfn_to_page(pfn1); |
| 614 | end = pfn_to_page(pfn2 - 1) + 1; |
| 615 | |
| 616 | do { |
| 617 | if (PageReserved(page)) |
| 618 | reserved_pages++; |
| 619 | else if (!page_count(page)) |
| 620 | free_pages++; |
| 621 | page++; |
| 622 | } while (page < end); |
| 623 | } |
| 624 | |
| 625 | /* |
| 626 | * Since our memory may not be contiguous, calculate the |
| 627 | * real number of pages we have in this system |
| 628 | */ |
| 629 | printk(KERN_INFO "Memory:"); |
| 630 | num_physpages = 0; |
| 631 | for_each_memblock(memory, reg) { |
| 632 | unsigned long pages = memblock_region_memory_end_pfn(reg) - |
| 633 | memblock_region_memory_base_pfn(reg); |
| 634 | num_physpages += pages; |
| 635 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); |
| 636 | } |
| 637 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
| 638 | |
| 639 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
| 640 | nr_free_pages() << (PAGE_SHIFT-10), |
| 641 | free_pages << (PAGE_SHIFT-10), |
| 642 | reserved_pages << (PAGE_SHIFT-10), |
| 643 | totalhigh_pages << (PAGE_SHIFT-10)); |
| 644 | |
| 645 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| 646 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
| 647 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| 648 | |
| 649 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" |
| 650 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 651 | #ifdef CONFIG_HAVE_TCM |
| 652 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 653 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 654 | #endif |
| 655 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 656 | #ifdef CONFIG_MMU |
| 657 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 658 | #endif |
| 659 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 660 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 661 | #ifdef CONFIG_HIGHMEM |
| 662 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 663 | #endif |
| 664 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 665 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
| 666 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
| 667 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
| 668 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", |
| 669 | |
| 670 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + |
| 671 | (PAGE_SIZE)), |
| 672 | #ifdef CONFIG_HAVE_TCM |
| 673 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
| 674 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), |
| 675 | #endif |
| 676 | MLK(FIXADDR_START, FIXADDR_TOP), |
| 677 | #ifdef CONFIG_MMU |
| 678 | MLM(CONSISTENT_BASE, CONSISTENT_END), |
| 679 | #endif |
| 680 | MLM(VMALLOC_START, VMALLOC_END), |
| 681 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
| 682 | #ifdef CONFIG_HIGHMEM |
| 683 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * |
| 684 | (PAGE_SIZE)), |
| 685 | #endif |
| 686 | MLM(MODULES_VADDR, MODULES_END), |
| 687 | |
| 688 | MLK_ROUNDUP(_text, _etext), |
| 689 | MLK_ROUNDUP(__init_begin, __init_end), |
| 690 | MLK_ROUNDUP(_sdata, _edata), |
| 691 | MLK_ROUNDUP(__bss_start, __bss_stop)); |
| 692 | |
| 693 | #undef MLK |
| 694 | #undef MLM |
| 695 | #undef MLK_ROUNDUP |
| 696 | |
| 697 | /* |
| 698 | * Check boundaries twice: Some fundamental inconsistencies can |
| 699 | * be detected at build time already. |
| 700 | */ |
| 701 | #ifdef CONFIG_MMU |
| 702 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
| 703 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
| 704 | |
| 705 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
| 706 | BUG_ON(TASK_SIZE > MODULES_VADDR); |
| 707 | #endif |
| 708 | |
| 709 | #ifdef CONFIG_HIGHMEM |
| 710 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| 711 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| 712 | #endif |
| 713 | |
| 714 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
| 715 | extern int sysctl_overcommit_memory; |
| 716 | /* |
| 717 | * On a machine this small we won't get |
| 718 | * anywhere without overcommit, so turn |
| 719 | * it on by default. |
| 720 | */ |
| 721 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | void free_initmem(void) |
| 726 | { |
| 727 | #ifdef CONFIG_HAVE_TCM |
| 728 | extern char __tcm_start, __tcm_end; |
| 729 | |
| 730 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
| 731 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
| 732 | __phys_to_pfn(__pa(&__tcm_end)), |
| 733 | "TCM link"); |
| 734 | #endif |
| 735 | |
| 736 | poison_init_mem(__init_begin, __init_end - __init_begin); |
| 737 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
| 738 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
| 739 | __phys_to_pfn(__pa(__init_end)), |
| 740 | "init"); |
| 741 | } |
| 742 | |
| 743 | #ifdef CONFIG_BLK_DEV_INITRD |
| 744 | |
| 745 | static int keep_initrd; |
| 746 | |
| 747 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 748 | { |
| 749 | if (!keep_initrd) { |
| 750 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
| 751 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
| 752 | __phys_to_pfn(__pa(end)), |
| 753 | "initrd"); |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | static int __init keepinitrd_setup(char *__unused) |
| 758 | { |
| 759 | keep_initrd = 1; |
| 760 | return 1; |
| 761 | } |
| 762 | |
| 763 | __setup("keepinitrd", keepinitrd_setup); |
| 764 | #endif |