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/export.h> 17 #include <linux/nodemask.h> 18 #include <linux/initrd.h> 19 #include <linux/of_fdt.h> 20 #include <linux/highmem.h> 21 #include <linux/gfp.h> 22 #include <linux/memblock.h> 23 24 #include <asm/mach-types.h> 25 #include <asm/memblock.h> 26 #include <asm/prom.h> 27 #include <asm/sections.h> 28 #include <asm/setup.h> 29 #include <asm/sizes.h> 30 #include <asm/tlb.h> 31 #include <asm/fixmap.h> 32 33 #include <asm/mach/arch.h> 34 #include <asm/mach/map.h> 35 #include <asm/memblock.h> 36 37 #include "mm.h" 38 39 static unsigned long phys_initrd_start __initdata = 0; 40 static unsigned long phys_initrd_size __initdata = 0; 41 42 static int __init early_initrd(char *p) 43 { 44 unsigned long start, size; 45 char *endp; 46 47 start = memparse(p, &endp); 48 if (*endp == ',') { 49 size = memparse(endp + 1, NULL); 50 51 phys_initrd_start = start; 52 phys_initrd_size = size; 53 } 54 return 0; 55 } 56 early_param("initrd", early_initrd); 57 58 static int __init parse_tag_initrd(const struct tag *tag) 59 { 60 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 61 "please update your bootloader.\n"); 62 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 63 phys_initrd_size = tag->u.initrd.size; 64 return 0; 65 } 66 67 __tagtable(ATAG_INITRD, parse_tag_initrd); 68 69 static int __init parse_tag_initrd2(const struct tag *tag) 70 { 71 phys_initrd_start = tag->u.initrd.start; 72 phys_initrd_size = tag->u.initrd.size; 73 return 0; 74 } 75 76 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 77 78 #ifdef CONFIG_OF_FLATTREE 79 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) 80 { 81 phys_initrd_start = start; 82 phys_initrd_size = end - start; 83 } 84 #endif /* CONFIG_OF_FLATTREE */ 85 86 /* 87 * This keeps memory configuration data used by a couple memory 88 * initialization functions, as well as show_mem() for the skipping 89 * of holes in the memory map. It is populated by arm_add_memory(). 90 */ 91 struct meminfo meminfo; 92 93 void show_mem(unsigned int filter) 94 { 95 int free = 0, total = 0, reserved = 0; 96 int shared = 0, cached = 0, slab = 0, i; 97 struct meminfo * mi = &meminfo; 98 99 printk("Mem-info:\n"); 100 show_free_areas(filter); 101 102 for_each_bank (i, mi) { 103 struct membank *bank = &mi->bank[i]; 104 unsigned int pfn1, pfn2; 105 struct page *page, *end; 106 107 pfn1 = bank_pfn_start(bank); 108 pfn2 = bank_pfn_end(bank); 109 110 page = pfn_to_page(pfn1); 111 end = pfn_to_page(pfn2 - 1) + 1; 112 113 do { 114 total++; 115 if (PageReserved(page)) 116 reserved++; 117 else if (PageSwapCache(page)) 118 cached++; 119 else if (PageSlab(page)) 120 slab++; 121 else if (!page_count(page)) 122 free++; 123 else 124 shared += page_count(page) - 1; 125 page++; 126 } while (page < end); 127 } 128 129 printk("%d pages of RAM\n", total); 130 printk("%d free pages\n", free); 131 printk("%d reserved pages\n", reserved); 132 printk("%d slab pages\n", slab); 133 printk("%d pages shared\n", shared); 134 printk("%d pages swap cached\n", cached); 135 } 136 137 static void __init find_limits(unsigned long *min, unsigned long *max_low, 138 unsigned long *max_high) 139 { 140 struct meminfo *mi = &meminfo; 141 int i; 142 143 /* This assumes the meminfo array is properly sorted */ 144 *min = bank_pfn_start(&mi->bank[0]); 145 for_each_bank (i, mi) 146 if (mi->bank[i].highmem) 147 break; 148 *max_low = bank_pfn_end(&mi->bank[i - 1]); 149 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); 150 } 151 152 static void __init arm_bootmem_init(unsigned long start_pfn, 153 unsigned long end_pfn) 154 { 155 struct memblock_region *reg; 156 unsigned int boot_pages; 157 phys_addr_t bitmap; 158 pg_data_t *pgdat; 159 160 /* 161 * Allocate the bootmem bitmap page. This must be in a region 162 * of memory which has already been mapped. 163 */ 164 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 165 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 166 __pfn_to_phys(end_pfn)); 167 168 /* 169 * Initialise the bootmem allocator, handing the 170 * memory banks over to bootmem. 171 */ 172 node_set_online(0); 173 pgdat = NODE_DATA(0); 174 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 175 176 /* Free the lowmem regions from memblock into bootmem. */ 177 for_each_memblock(memory, reg) { 178 unsigned long start = memblock_region_memory_base_pfn(reg); 179 unsigned long end = memblock_region_memory_end_pfn(reg); 180 181 if (end >= end_pfn) 182 end = end_pfn; 183 if (start >= end) 184 break; 185 186 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 187 } 188 189 /* Reserve the lowmem memblock reserved regions in bootmem. */ 190 for_each_memblock(reserved, reg) { 191 unsigned long start = memblock_region_reserved_base_pfn(reg); 192 unsigned long end = memblock_region_reserved_end_pfn(reg); 193 194 if (end >= end_pfn) 195 end = end_pfn; 196 if (start >= end) 197 break; 198 199 reserve_bootmem(__pfn_to_phys(start), 200 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 201 } 202 } 203 204 #ifdef CONFIG_ZONE_DMA 205 206 unsigned long arm_dma_zone_size __read_mostly; 207 EXPORT_SYMBOL(arm_dma_zone_size); 208 209 /* 210 * The DMA mask corresponding to the maximum bus address allocatable 211 * using GFP_DMA. The default here places no restriction on DMA 212 * allocations. This must be the smallest DMA mask in the system, 213 * so a successful GFP_DMA allocation will always satisfy this. 214 */ 215 u32 arm_dma_limit; 216 217 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 218 unsigned long dma_size) 219 { 220 if (size[0] <= dma_size) 221 return; 222 223 size[ZONE_NORMAL] = size[0] - dma_size; 224 size[ZONE_DMA] = dma_size; 225 hole[ZONE_NORMAL] = hole[0]; 226 hole[ZONE_DMA] = 0; 227 } 228 #endif 229 230 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 231 unsigned long max_high) 232 { 233 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 234 struct memblock_region *reg; 235 236 /* 237 * initialise the zones. 238 */ 239 memset(zone_size, 0, sizeof(zone_size)); 240 241 /* 242 * The memory size has already been determined. If we need 243 * to do anything fancy with the allocation of this memory 244 * to the zones, now is the time to do it. 245 */ 246 zone_size[0] = max_low - min; 247 #ifdef CONFIG_HIGHMEM 248 zone_size[ZONE_HIGHMEM] = max_high - max_low; 249 #endif 250 251 /* 252 * Calculate the size of the holes. 253 * holes = node_size - sum(bank_sizes) 254 */ 255 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 256 for_each_memblock(memory, reg) { 257 unsigned long start = memblock_region_memory_base_pfn(reg); 258 unsigned long end = memblock_region_memory_end_pfn(reg); 259 260 if (start < max_low) { 261 unsigned long low_end = min(end, max_low); 262 zhole_size[0] -= low_end - start; 263 } 264 #ifdef CONFIG_HIGHMEM 265 if (end > max_low) { 266 unsigned long high_start = max(start, max_low); 267 zhole_size[ZONE_HIGHMEM] -= end - high_start; 268 } 269 #endif 270 } 271 272 #ifdef CONFIG_ZONE_DMA 273 /* 274 * Adjust the sizes according to any special requirements for 275 * this machine type. 276 */ 277 if (arm_dma_zone_size) { 278 arm_adjust_dma_zone(zone_size, zhole_size, 279 arm_dma_zone_size >> PAGE_SHIFT); 280 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 281 } else 282 arm_dma_limit = 0xffffffff; 283 #endif 284 285 free_area_init_node(0, zone_size, min, zhole_size); 286 } 287 288 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 289 int pfn_valid(unsigned long pfn) 290 { 291 return memblock_is_memory(__pfn_to_phys(pfn)); 292 } 293 EXPORT_SYMBOL(pfn_valid); 294 #endif 295 296 #ifndef CONFIG_SPARSEMEM 297 static void arm_memory_present(void) 298 { 299 } 300 #else 301 static void arm_memory_present(void) 302 { 303 struct memblock_region *reg; 304 305 for_each_memblock(memory, reg) 306 memory_present(0, memblock_region_memory_base_pfn(reg), 307 memblock_region_memory_end_pfn(reg)); 308 } 309 #endif 310 311 static bool arm_memblock_steal_permitted = true; 312 313 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 314 { 315 phys_addr_t phys; 316 317 BUG_ON(!arm_memblock_steal_permitted); 318 319 phys = memblock_alloc(size, align); 320 memblock_free(phys, size); 321 memblock_remove(phys, size); 322 323 return phys; 324 } 325 326 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 327 { 328 int i; 329 330 for (i = 0; i < mi->nr_banks; i++) 331 memblock_add(mi->bank[i].start, mi->bank[i].size); 332 333 /* Register the kernel text, kernel data and initrd with memblock. */ 334 #ifdef CONFIG_XIP_KERNEL 335 memblock_reserve(__pa(_sdata), _end - _sdata); 336 #else 337 memblock_reserve(__pa(_stext), _end - _stext); 338 #endif 339 #ifdef CONFIG_BLK_DEV_INITRD 340 if (phys_initrd_size && 341 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 342 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", 343 phys_initrd_start, phys_initrd_size); 344 phys_initrd_start = phys_initrd_size = 0; 345 } 346 if (phys_initrd_size && 347 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 348 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 349 phys_initrd_start, phys_initrd_size); 350 phys_initrd_start = phys_initrd_size = 0; 351 } 352 if (phys_initrd_size) { 353 memblock_reserve(phys_initrd_start, phys_initrd_size); 354 355 /* Now convert initrd to virtual addresses */ 356 initrd_start = __phys_to_virt(phys_initrd_start); 357 initrd_end = initrd_start + phys_initrd_size; 358 } 359 #endif 360 361 arm_mm_memblock_reserve(); 362 arm_dt_memblock_reserve(); 363 364 /* reserve any platform specific memblock areas */ 365 if (mdesc->reserve) 366 mdesc->reserve(); 367 368 arm_memblock_steal_permitted = false; 369 memblock_allow_resize(); 370 memblock_dump_all(); 371 } 372 373 void __init bootmem_init(void) 374 { 375 unsigned long min, max_low, max_high; 376 377 max_low = max_high = 0; 378 379 find_limits(&min, &max_low, &max_high); 380 381 arm_bootmem_init(min, max_low); 382 383 /* 384 * Sparsemem tries to allocate bootmem in memory_present(), 385 * so must be done after the fixed reservations 386 */ 387 arm_memory_present(); 388 389 /* 390 * sparse_init() needs the bootmem allocator up and running. 391 */ 392 sparse_init(); 393 394 /* 395 * Now free the memory - free_area_init_node needs 396 * the sparse mem_map arrays initialized by sparse_init() 397 * for memmap_init_zone(), otherwise all PFNs are invalid. 398 */ 399 arm_bootmem_free(min, max_low, max_high); 400 401 /* 402 * This doesn't seem to be used by the Linux memory manager any 403 * more, but is used by ll_rw_block. If we can get rid of it, we 404 * also get rid of some of the stuff above as well. 405 * 406 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 407 * the system, not the maximum PFN. 408 */ 409 max_low_pfn = max_low - PHYS_PFN_OFFSET; 410 max_pfn = max_high - PHYS_PFN_OFFSET; 411 } 412 413 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 414 { 415 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 416 417 for (; pfn < end; pfn++) { 418 struct page *page = pfn_to_page(pfn); 419 ClearPageReserved(page); 420 init_page_count(page); 421 __free_page(page); 422 pages++; 423 } 424 425 if (size && s) 426 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 427 428 return pages; 429 } 430 431 /* 432 * Poison init memory with an undefined instruction (ARM) or a branch to an 433 * undefined instruction (Thumb). 434 */ 435 static inline void poison_init_mem(void *s, size_t count) 436 { 437 u32 *p = (u32 *)s; 438 for (; count != 0; count -= 4) 439 *p++ = 0xe7fddef0; 440 } 441 442 static inline void 443 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 444 { 445 struct page *start_pg, *end_pg; 446 unsigned long pg, pgend; 447 448 /* 449 * Convert start_pfn/end_pfn to a struct page pointer. 450 */ 451 start_pg = pfn_to_page(start_pfn - 1) + 1; 452 end_pg = pfn_to_page(end_pfn - 1) + 1; 453 454 /* 455 * Convert to physical addresses, and 456 * round start upwards and end downwards. 457 */ 458 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 459 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 460 461 /* 462 * If there are free pages between these, 463 * free the section of the memmap array. 464 */ 465 if (pg < pgend) 466 free_bootmem(pg, pgend - pg); 467 } 468 469 /* 470 * The mem_map array can get very big. Free the unused area of the memory map. 471 */ 472 static void __init free_unused_memmap(struct meminfo *mi) 473 { 474 unsigned long bank_start, prev_bank_end = 0; 475 unsigned int i; 476 477 /* 478 * This relies on each bank being in address order. 479 * The banks are sorted previously in bootmem_init(). 480 */ 481 for_each_bank(i, mi) { 482 struct membank *bank = &mi->bank[i]; 483 484 bank_start = bank_pfn_start(bank); 485 486 #ifdef CONFIG_SPARSEMEM 487 /* 488 * Take care not to free memmap entries that don't exist 489 * due to SPARSEMEM sections which aren't present. 490 */ 491 bank_start = min(bank_start, 492 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 493 #else 494 /* 495 * Align down here since the VM subsystem insists that the 496 * memmap entries are valid from the bank start aligned to 497 * MAX_ORDER_NR_PAGES. 498 */ 499 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 500 #endif 501 /* 502 * If we had a previous bank, and there is a space 503 * between the current bank and the previous, free it. 504 */ 505 if (prev_bank_end && prev_bank_end < bank_start) 506 free_memmap(prev_bank_end, bank_start); 507 508 /* 509 * Align up here since the VM subsystem insists that the 510 * memmap entries are valid from the bank end aligned to 511 * MAX_ORDER_NR_PAGES. 512 */ 513 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 514 } 515 516 #ifdef CONFIG_SPARSEMEM 517 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 518 free_memmap(prev_bank_end, 519 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 520 #endif 521 } 522 523 static void __init free_highpages(void) 524 { 525 #ifdef CONFIG_HIGHMEM 526 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 527 struct memblock_region *mem, *res; 528 529 /* set highmem page free */ 530 for_each_memblock(memory, mem) { 531 unsigned long start = memblock_region_memory_base_pfn(mem); 532 unsigned long end = memblock_region_memory_end_pfn(mem); 533 534 /* Ignore complete lowmem entries */ 535 if (end <= max_low) 536 continue; 537 538 /* Truncate partial highmem entries */ 539 if (start < max_low) 540 start = max_low; 541 542 /* Find and exclude any reserved regions */ 543 for_each_memblock(reserved, res) { 544 unsigned long res_start, res_end; 545 546 res_start = memblock_region_reserved_base_pfn(res); 547 res_end = memblock_region_reserved_end_pfn(res); 548 549 if (res_end < start) 550 continue; 551 if (res_start < start) 552 res_start = start; 553 if (res_start > end) 554 res_start = end; 555 if (res_end > end) 556 res_end = end; 557 if (res_start != start) 558 totalhigh_pages += free_area(start, res_start, 559 NULL); 560 start = res_end; 561 if (start == end) 562 break; 563 } 564 565 /* And now free anything which remains */ 566 if (start < end) 567 totalhigh_pages += free_area(start, end, NULL); 568 } 569 totalram_pages += totalhigh_pages; 570 #endif 571 } 572 573 /* 574 * mem_init() marks the free areas in the mem_map and tells us how much 575 * memory is free. This is done after various parts of the system have 576 * claimed their memory after the kernel image. 577 */ 578 void __init mem_init(void) 579 { 580 unsigned long reserved_pages, free_pages; 581 struct memblock_region *reg; 582 int i; 583 #ifdef CONFIG_HAVE_TCM 584 /* These pointers are filled in on TCM detection */ 585 extern u32 dtcm_end; 586 extern u32 itcm_end; 587 #endif 588 589 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 590 591 /* this will put all unused low memory onto the freelists */ 592 free_unused_memmap(&meminfo); 593 594 totalram_pages += free_all_bootmem(); 595 596 #ifdef CONFIG_SA1111 597 /* now that our DMA memory is actually so designated, we can free it */ 598 totalram_pages += free_area(PHYS_PFN_OFFSET, 599 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 600 #endif 601 602 free_highpages(); 603 604 reserved_pages = free_pages = 0; 605 606 for_each_bank(i, &meminfo) { 607 struct membank *bank = &meminfo.bank[i]; 608 unsigned int pfn1, pfn2; 609 struct page *page, *end; 610 611 pfn1 = bank_pfn_start(bank); 612 pfn2 = bank_pfn_end(bank); 613 614 page = pfn_to_page(pfn1); 615 end = pfn_to_page(pfn2 - 1) + 1; 616 617 do { 618 if (PageReserved(page)) 619 reserved_pages++; 620 else if (!page_count(page)) 621 free_pages++; 622 page++; 623 } while (page < end); 624 } 625 626 /* 627 * Since our memory may not be contiguous, calculate the 628 * real number of pages we have in this system 629 */ 630 printk(KERN_INFO "Memory:"); 631 num_physpages = 0; 632 for_each_memblock(memory, reg) { 633 unsigned long pages = memblock_region_memory_end_pfn(reg) - 634 memblock_region_memory_base_pfn(reg); 635 num_physpages += pages; 636 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 637 } 638 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 639 640 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 641 nr_free_pages() << (PAGE_SHIFT-10), 642 free_pages << (PAGE_SHIFT-10), 643 reserved_pages << (PAGE_SHIFT-10), 644 totalhigh_pages << (PAGE_SHIFT-10)); 645 646 #define MLK(b, t) b, t, ((t) - (b)) >> 10 647 #define MLM(b, t) b, t, ((t) - (b)) >> 20 648 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 649 650 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 651 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 652 #ifdef CONFIG_HAVE_TCM 653 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 654 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 655 #endif 656 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 657 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 658 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 659 #ifdef CONFIG_HIGHMEM 660 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 661 #endif 662 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 663 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 664 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 665 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 666 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 667 668 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 669 (PAGE_SIZE)), 670 #ifdef CONFIG_HAVE_TCM 671 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 672 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 673 #endif 674 MLK(FIXADDR_START, FIXADDR_TOP), 675 MLM(VMALLOC_START, VMALLOC_END), 676 MLM(PAGE_OFFSET, (unsigned long)high_memory), 677 #ifdef CONFIG_HIGHMEM 678 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 679 (PAGE_SIZE)), 680 #endif 681 MLM(MODULES_VADDR, MODULES_END), 682 683 MLK_ROUNDUP(_text, _etext), 684 MLK_ROUNDUP(__init_begin, __init_end), 685 MLK_ROUNDUP(_sdata, _edata), 686 MLK_ROUNDUP(__bss_start, __bss_stop)); 687 688 #undef MLK 689 #undef MLM 690 #undef MLK_ROUNDUP 691 692 /* 693 * Check boundaries twice: Some fundamental inconsistencies can 694 * be detected at build time already. 695 */ 696 #ifdef CONFIG_MMU 697 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 698 BUG_ON(TASK_SIZE > MODULES_VADDR); 699 #endif 700 701 #ifdef CONFIG_HIGHMEM 702 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 703 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 704 #endif 705 706 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 707 extern int sysctl_overcommit_memory; 708 /* 709 * On a machine this small we won't get 710 * anywhere without overcommit, so turn 711 * it on by default. 712 */ 713 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 714 } 715 } 716 717 void free_initmem(void) 718 { 719 #ifdef CONFIG_HAVE_TCM 720 extern char __tcm_start, __tcm_end; 721 722 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 723 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 724 __phys_to_pfn(__pa(&__tcm_end)), 725 "TCM link"); 726 #endif 727 728 poison_init_mem(__init_begin, __init_end - __init_begin); 729 if (!machine_is_integrator() && !machine_is_cintegrator()) 730 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 731 __phys_to_pfn(__pa(__init_end)), 732 "init"); 733 } 734 735 #ifdef CONFIG_BLK_DEV_INITRD 736 737 static int keep_initrd; 738 739 void free_initrd_mem(unsigned long start, unsigned long end) 740 { 741 if (!keep_initrd) { 742 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 743 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 744 __phys_to_pfn(__pa(end)), 745 "initrd"); 746 } 747 } 748 749 static int __init keepinitrd_setup(char *__unused) 750 { 751 keep_initrd = 1; 752 return 1; 753 } 754 755 __setup("keepinitrd", keepinitrd_setup); 756 #endif 757