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