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 static inline void 438 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 439 { 440 struct page *start_pg, *end_pg; 441 unsigned long pg, pgend; 442 443 /* 444 * Convert start_pfn/end_pfn to a struct page pointer. 445 */ 446 start_pg = pfn_to_page(start_pfn - 1) + 1; 447 end_pg = pfn_to_page(end_pfn - 1) + 1; 448 449 /* 450 * Convert to physical addresses, and 451 * round start upwards and end downwards. 452 */ 453 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 454 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 455 456 /* 457 * If there are free pages between these, 458 * free the section of the memmap array. 459 */ 460 if (pg < pgend) 461 free_bootmem(pg, pgend - pg); 462 } 463 464 /* 465 * The mem_map array can get very big. Free the unused area of the memory map. 466 */ 467 static void __init free_unused_memmap(struct meminfo *mi) 468 { 469 unsigned long bank_start, prev_bank_end = 0; 470 unsigned int i; 471 472 /* 473 * This relies on each bank being in address order. 474 * The banks are sorted previously in bootmem_init(). 475 */ 476 for_each_bank(i, mi) { 477 struct membank *bank = &mi->bank[i]; 478 479 bank_start = bank_pfn_start(bank); 480 481 #ifdef CONFIG_SPARSEMEM 482 /* 483 * Take care not to free memmap entries that don't exist 484 * due to SPARSEMEM sections which aren't present. 485 */ 486 bank_start = min(bank_start, 487 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 488 #endif 489 /* 490 * If we had a previous bank, and there is a space 491 * between the current bank and the previous, free it. 492 */ 493 if (prev_bank_end && prev_bank_end < bank_start) 494 free_memmap(prev_bank_end, bank_start); 495 496 /* 497 * Align up here since the VM subsystem insists that the 498 * memmap entries are valid from the bank end aligned to 499 * MAX_ORDER_NR_PAGES. 500 */ 501 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 502 } 503 504 #ifdef CONFIG_SPARSEMEM 505 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 506 free_memmap(prev_bank_end, 507 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 508 #endif 509 } 510 511 static void __init free_highpages(void) 512 { 513 #ifdef CONFIG_HIGHMEM 514 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 515 struct memblock_region *mem, *res; 516 517 /* set highmem page free */ 518 for_each_memblock(memory, mem) { 519 unsigned long start = memblock_region_memory_base_pfn(mem); 520 unsigned long end = memblock_region_memory_end_pfn(mem); 521 522 /* Ignore complete lowmem entries */ 523 if (end <= max_low) 524 continue; 525 526 /* Truncate partial highmem entries */ 527 if (start < max_low) 528 start = max_low; 529 530 /* Find and exclude any reserved regions */ 531 for_each_memblock(reserved, res) { 532 unsigned long res_start, res_end; 533 534 res_start = memblock_region_reserved_base_pfn(res); 535 res_end = memblock_region_reserved_end_pfn(res); 536 537 if (res_end < start) 538 continue; 539 if (res_start < start) 540 res_start = start; 541 if (res_start > end) 542 res_start = end; 543 if (res_end > end) 544 res_end = end; 545 if (res_start != start) 546 totalhigh_pages += free_area(start, res_start, 547 NULL); 548 start = res_end; 549 if (start == end) 550 break; 551 } 552 553 /* And now free anything which remains */ 554 if (start < end) 555 totalhigh_pages += free_area(start, end, NULL); 556 } 557 totalram_pages += totalhigh_pages; 558 #endif 559 } 560 561 /* 562 * mem_init() marks the free areas in the mem_map and tells us how much 563 * memory is free. This is done after various parts of the system have 564 * claimed their memory after the kernel image. 565 */ 566 void __init mem_init(void) 567 { 568 unsigned long reserved_pages, free_pages; 569 struct memblock_region *reg; 570 int i; 571 #ifdef CONFIG_HAVE_TCM 572 /* These pointers are filled in on TCM detection */ 573 extern u32 dtcm_end; 574 extern u32 itcm_end; 575 #endif 576 577 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 578 579 /* this will put all unused low memory onto the freelists */ 580 free_unused_memmap(&meminfo); 581 582 totalram_pages += free_all_bootmem(); 583 584 #ifdef CONFIG_SA1111 585 /* now that our DMA memory is actually so designated, we can free it */ 586 totalram_pages += free_area(PHYS_PFN_OFFSET, 587 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 588 #endif 589 590 free_highpages(); 591 592 reserved_pages = free_pages = 0; 593 594 for_each_bank(i, &meminfo) { 595 struct membank *bank = &meminfo.bank[i]; 596 unsigned int pfn1, pfn2; 597 struct page *page, *end; 598 599 pfn1 = bank_pfn_start(bank); 600 pfn2 = bank_pfn_end(bank); 601 602 page = pfn_to_page(pfn1); 603 end = pfn_to_page(pfn2 - 1) + 1; 604 605 do { 606 if (PageReserved(page)) 607 reserved_pages++; 608 else if (!page_count(page)) 609 free_pages++; 610 page++; 611 } while (page < end); 612 } 613 614 /* 615 * Since our memory may not be contiguous, calculate the 616 * real number of pages we have in this system 617 */ 618 printk(KERN_INFO "Memory:"); 619 num_physpages = 0; 620 for_each_memblock(memory, reg) { 621 unsigned long pages = memblock_region_memory_end_pfn(reg) - 622 memblock_region_memory_base_pfn(reg); 623 num_physpages += pages; 624 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 625 } 626 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 627 628 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 629 nr_free_pages() << (PAGE_SHIFT-10), 630 free_pages << (PAGE_SHIFT-10), 631 reserved_pages << (PAGE_SHIFT-10), 632 totalhigh_pages << (PAGE_SHIFT-10)); 633 634 #define MLK(b, t) b, t, ((t) - (b)) >> 10 635 #define MLM(b, t) b, t, ((t) - (b)) >> 20 636 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 637 638 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 639 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 640 #ifdef CONFIG_HAVE_TCM 641 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 642 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 643 #endif 644 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 645 #ifdef CONFIG_MMU 646 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 647 #endif 648 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 649 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 650 #ifdef CONFIG_HIGHMEM 651 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 652 #endif 653 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 654 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 655 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 656 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 657 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 658 659 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 660 (PAGE_SIZE)), 661 #ifdef CONFIG_HAVE_TCM 662 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 663 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 664 #endif 665 MLK(FIXADDR_START, FIXADDR_TOP), 666 #ifdef CONFIG_MMU 667 MLM(CONSISTENT_BASE, CONSISTENT_END), 668 #endif 669 MLM(VMALLOC_START, VMALLOC_END), 670 MLM(PAGE_OFFSET, (unsigned long)high_memory), 671 #ifdef CONFIG_HIGHMEM 672 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 673 (PAGE_SIZE)), 674 #endif 675 MLM(MODULES_VADDR, MODULES_END), 676 677 MLK_ROUNDUP(__init_begin, __init_end), 678 MLK_ROUNDUP(_text, _etext), 679 MLK_ROUNDUP(_sdata, _edata), 680 MLK_ROUNDUP(__bss_start, __bss_stop)); 681 682 #undef MLK 683 #undef MLM 684 #undef MLK_ROUNDUP 685 686 /* 687 * Check boundaries twice: Some fundamental inconsistencies can 688 * be detected at build time already. 689 */ 690 #ifdef CONFIG_MMU 691 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 692 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 693 694 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 695 BUG_ON(TASK_SIZE > MODULES_VADDR); 696 #endif 697 698 #ifdef CONFIG_HIGHMEM 699 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 700 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 701 #endif 702 703 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 704 extern int sysctl_overcommit_memory; 705 /* 706 * On a machine this small we won't get 707 * anywhere without overcommit, so turn 708 * it on by default. 709 */ 710 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 711 } 712 } 713 714 void free_initmem(void) 715 { 716 #ifdef CONFIG_HAVE_TCM 717 extern char __tcm_start, __tcm_end; 718 719 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 720 __phys_to_pfn(__pa(&__tcm_end)), 721 "TCM link"); 722 #endif 723 724 if (!machine_is_integrator() && !machine_is_cintegrator()) 725 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 726 __phys_to_pfn(__pa(__init_end)), 727 "init"); 728 } 729 730 #ifdef CONFIG_BLK_DEV_INITRD 731 732 static int keep_initrd; 733 734 void free_initrd_mem(unsigned long start, unsigned long end) 735 { 736 if (!keep_initrd) 737 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 738 __phys_to_pfn(__pa(end)), 739 "initrd"); 740 } 741 742 static int __init keepinitrd_setup(char *__unused) 743 { 744 keep_initrd = 1; 745 return 1; 746 } 747 748 __setup("keepinitrd", keepinitrd_setup); 749 #endif 750