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_to_phys(pfn)); 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 for (; count != 0; 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 #else 500 /* 501 * Align down here since the VM subsystem insists that the 502 * memmap entries are valid from the bank start aligned to 503 * MAX_ORDER_NR_PAGES. 504 */ 505 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 506 #endif 507 /* 508 * If we had a previous bank, and there is a space 509 * between the current bank and the previous, free it. 510 */ 511 if (prev_bank_end && prev_bank_end < bank_start) 512 free_memmap(prev_bank_end, bank_start); 513 514 /* 515 * Align up here since the VM subsystem insists that the 516 * memmap entries are valid from the bank end aligned to 517 * MAX_ORDER_NR_PAGES. 518 */ 519 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 520 } 521 522 #ifdef CONFIG_SPARSEMEM 523 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 524 free_memmap(prev_bank_end, 525 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 526 #endif 527 } 528 529 static void __init free_highpages(void) 530 { 531 #ifdef CONFIG_HIGHMEM 532 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 533 struct memblock_region *mem, *res; 534 535 /* set highmem page free */ 536 for_each_memblock(memory, mem) { 537 unsigned long start = memblock_region_memory_base_pfn(mem); 538 unsigned long end = memblock_region_memory_end_pfn(mem); 539 540 /* Ignore complete lowmem entries */ 541 if (end <= max_low) 542 continue; 543 544 /* Truncate partial highmem entries */ 545 if (start < max_low) 546 start = max_low; 547 548 /* Find and exclude any reserved regions */ 549 for_each_memblock(reserved, res) { 550 unsigned long res_start, res_end; 551 552 res_start = memblock_region_reserved_base_pfn(res); 553 res_end = memblock_region_reserved_end_pfn(res); 554 555 if (res_end < start) 556 continue; 557 if (res_start < start) 558 res_start = start; 559 if (res_start > end) 560 res_start = end; 561 if (res_end > end) 562 res_end = end; 563 if (res_start != start) 564 totalhigh_pages += free_area(start, res_start, 565 NULL); 566 start = res_end; 567 if (start == end) 568 break; 569 } 570 571 /* And now free anything which remains */ 572 if (start < end) 573 totalhigh_pages += free_area(start, end, NULL); 574 } 575 totalram_pages += totalhigh_pages; 576 #endif 577 } 578 579 /* 580 * mem_init() marks the free areas in the mem_map and tells us how much 581 * memory is free. This is done after various parts of the system have 582 * claimed their memory after the kernel image. 583 */ 584 void __init mem_init(void) 585 { 586 unsigned long reserved_pages, free_pages; 587 struct memblock_region *reg; 588 int i; 589 #ifdef CONFIG_HAVE_TCM 590 /* These pointers are filled in on TCM detection */ 591 extern u32 dtcm_end; 592 extern u32 itcm_end; 593 #endif 594 595 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 596 597 /* this will put all unused low memory onto the freelists */ 598 free_unused_memmap(&meminfo); 599 600 totalram_pages += free_all_bootmem(); 601 602 #ifdef CONFIG_SA1111 603 /* now that our DMA memory is actually so designated, we can free it */ 604 totalram_pages += free_area(PHYS_PFN_OFFSET, 605 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 606 #endif 607 608 free_highpages(); 609 610 reserved_pages = free_pages = 0; 611 612 for_each_bank(i, &meminfo) { 613 struct membank *bank = &meminfo.bank[i]; 614 unsigned int pfn1, pfn2; 615 struct page *page, *end; 616 617 pfn1 = bank_pfn_start(bank); 618 pfn2 = bank_pfn_end(bank); 619 620 page = pfn_to_page(pfn1); 621 end = pfn_to_page(pfn2 - 1) + 1; 622 623 do { 624 if (PageReserved(page)) 625 reserved_pages++; 626 else if (!page_count(page)) 627 free_pages++; 628 page++; 629 } while (page < end); 630 } 631 632 /* 633 * Since our memory may not be contiguous, calculate the 634 * real number of pages we have in this system 635 */ 636 printk(KERN_INFO "Memory:"); 637 num_physpages = 0; 638 for_each_memblock(memory, reg) { 639 unsigned long pages = memblock_region_memory_end_pfn(reg) - 640 memblock_region_memory_base_pfn(reg); 641 num_physpages += pages; 642 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 643 } 644 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 645 646 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 647 nr_free_pages() << (PAGE_SHIFT-10), 648 free_pages << (PAGE_SHIFT-10), 649 reserved_pages << (PAGE_SHIFT-10), 650 totalhigh_pages << (PAGE_SHIFT-10)); 651 652 #define MLK(b, t) b, t, ((t) - (b)) >> 10 653 #define MLM(b, t) b, t, ((t) - (b)) >> 20 654 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 655 656 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 657 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 658 #ifdef CONFIG_HAVE_TCM 659 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 660 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 661 #endif 662 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 663 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 664 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 665 #ifdef CONFIG_HIGHMEM 666 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 667 #endif 668 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 669 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 670 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 671 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 672 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 673 674 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 675 (PAGE_SIZE)), 676 #ifdef CONFIG_HAVE_TCM 677 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 678 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 679 #endif 680 MLK(FIXADDR_START, FIXADDR_TOP), 681 MLM(VMALLOC_START, VMALLOC_END), 682 MLM(PAGE_OFFSET, (unsigned long)high_memory), 683 #ifdef CONFIG_HIGHMEM 684 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 685 (PAGE_SIZE)), 686 #endif 687 MLM(MODULES_VADDR, MODULES_END), 688 689 MLK_ROUNDUP(_text, _etext), 690 MLK_ROUNDUP(__init_begin, __init_end), 691 MLK_ROUNDUP(_sdata, _edata), 692 MLK_ROUNDUP(__bss_start, __bss_stop)); 693 694 #undef MLK 695 #undef MLM 696 #undef MLK_ROUNDUP 697 698 /* 699 * Check boundaries twice: Some fundamental inconsistencies can 700 * be detected at build time already. 701 */ 702 #ifdef CONFIG_MMU 703 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 704 BUG_ON(TASK_SIZE > MODULES_VADDR); 705 #endif 706 707 #ifdef CONFIG_HIGHMEM 708 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 709 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 710 #endif 711 712 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 713 extern int sysctl_overcommit_memory; 714 /* 715 * On a machine this small we won't get 716 * anywhere without overcommit, so turn 717 * it on by default. 718 */ 719 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 720 } 721 } 722 723 void free_initmem(void) 724 { 725 #ifdef CONFIG_HAVE_TCM 726 extern char __tcm_start, __tcm_end; 727 728 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 729 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 730 __phys_to_pfn(__pa(&__tcm_end)), 731 "TCM link"); 732 #endif 733 734 poison_init_mem(__init_begin, __init_end - __init_begin); 735 if (!machine_is_integrator() && !machine_is_cintegrator()) 736 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 737 __phys_to_pfn(__pa(__init_end)), 738 "init"); 739 } 740 741 #ifdef CONFIG_BLK_DEV_INITRD 742 743 static int keep_initrd; 744 745 void free_initrd_mem(unsigned long start, unsigned long end) 746 { 747 if (!keep_initrd) { 748 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 749 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 750 __phys_to_pfn(__pa(end)), 751 "initrd"); 752 } 753 } 754 755 static int __init keepinitrd_setup(char *__unused) 756 { 757 keep_initrd = 1; 758 return 1; 759 } 760 761 __setup("keepinitrd", keepinitrd_setup); 762 #endif 763