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#include <linux/dma-contiguous.h> 24#include <linux/sizes.h> 25 26#include <asm/cp15.h> 27#include <asm/mach-types.h> 28#include <asm/memblock.h> 29#include <asm/prom.h> 30#include <asm/sections.h> 31#include <asm/setup.h> 32#include <asm/system_info.h> 33#include <asm/tlb.h> 34#include <asm/fixmap.h> 35 36#include <asm/mach/arch.h> 37#include <asm/mach/map.h> 38 39#include "mm.h" 40 41#ifdef CONFIG_CPU_CP15_MMU 42unsigned long __init __clear_cr(unsigned long mask) 43{ 44 cr_alignment = cr_alignment & ~mask; 45 return cr_alignment; 46} 47#endif 48 49static phys_addr_t phys_initrd_start __initdata = 0; 50static unsigned long phys_initrd_size __initdata = 0; 51 52static int __init early_initrd(char *p) 53{ 54 phys_addr_t start; 55 unsigned long size; 56 char *endp; 57 58 start = memparse(p, &endp); 59 if (*endp == ',') { 60 size = memparse(endp + 1, NULL); 61 62 phys_initrd_start = start; 63 phys_initrd_size = size; 64 } 65 return 0; 66} 67early_param("initrd", early_initrd); 68 69static int __init parse_tag_initrd(const struct tag *tag) 70{ 71 pr_warn("ATAG_INITRD is deprecated; " 72 "please update your bootloader.\n"); 73 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 74 phys_initrd_size = tag->u.initrd.size; 75 return 0; 76} 77 78__tagtable(ATAG_INITRD, parse_tag_initrd); 79 80static int __init parse_tag_initrd2(const struct tag *tag) 81{ 82 phys_initrd_start = tag->u.initrd.start; 83 phys_initrd_size = tag->u.initrd.size; 84 return 0; 85} 86 87__tagtable(ATAG_INITRD2, parse_tag_initrd2); 88 89static void __init find_limits(unsigned long *min, unsigned long *max_low, 90 unsigned long *max_high) 91{ 92 *max_low = PFN_DOWN(memblock_get_current_limit()); 93 *min = PFN_UP(memblock_start_of_DRAM()); 94 *max_high = PFN_DOWN(memblock_end_of_DRAM()); 95} 96 97#ifdef CONFIG_ZONE_DMA 98 99phys_addr_t arm_dma_zone_size __read_mostly; 100EXPORT_SYMBOL(arm_dma_zone_size); 101 102/* 103 * The DMA mask corresponding to the maximum bus address allocatable 104 * using GFP_DMA. The default here places no restriction on DMA 105 * allocations. This must be the smallest DMA mask in the system, 106 * so a successful GFP_DMA allocation will always satisfy this. 107 */ 108phys_addr_t arm_dma_limit; 109unsigned long arm_dma_pfn_limit; 110 111static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 112 unsigned long dma_size) 113{ 114 if (size[0] <= dma_size) 115 return; 116 117 size[ZONE_NORMAL] = size[0] - dma_size; 118 size[ZONE_DMA] = dma_size; 119 hole[ZONE_NORMAL] = hole[0]; 120 hole[ZONE_DMA] = 0; 121} 122#endif 123 124void __init setup_dma_zone(const struct machine_desc *mdesc) 125{ 126#ifdef CONFIG_ZONE_DMA 127 if (mdesc->dma_zone_size) { 128 arm_dma_zone_size = mdesc->dma_zone_size; 129 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 130 } else 131 arm_dma_limit = 0xffffffff; 132 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 133#endif 134} 135 136static void __init zone_sizes_init(unsigned long min, unsigned long max_low, 137 unsigned long max_high) 138{ 139 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 140 struct memblock_region *reg; 141 142 /* 143 * initialise the zones. 144 */ 145 memset(zone_size, 0, sizeof(zone_size)); 146 147 /* 148 * The memory size has already been determined. If we need 149 * to do anything fancy with the allocation of this memory 150 * to the zones, now is the time to do it. 151 */ 152 zone_size[0] = max_low - min; 153#ifdef CONFIG_HIGHMEM 154 zone_size[ZONE_HIGHMEM] = max_high - max_low; 155#endif 156 157 /* 158 * Calculate the size of the holes. 159 * holes = node_size - sum(bank_sizes) 160 */ 161 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 162 for_each_memblock(memory, reg) { 163 unsigned long start = memblock_region_memory_base_pfn(reg); 164 unsigned long end = memblock_region_memory_end_pfn(reg); 165 166 if (start < max_low) { 167 unsigned long low_end = min(end, max_low); 168 zhole_size[0] -= low_end - start; 169 } 170#ifdef CONFIG_HIGHMEM 171 if (end > max_low) { 172 unsigned long high_start = max(start, max_low); 173 zhole_size[ZONE_HIGHMEM] -= end - high_start; 174 } 175#endif 176 } 177 178#ifdef CONFIG_ZONE_DMA 179 /* 180 * Adjust the sizes according to any special requirements for 181 * this machine type. 182 */ 183 if (arm_dma_zone_size) 184 arm_adjust_dma_zone(zone_size, zhole_size, 185 arm_dma_zone_size >> PAGE_SHIFT); 186#endif 187 188 free_area_init_node(0, zone_size, min, zhole_size); 189} 190 191#ifdef CONFIG_HAVE_ARCH_PFN_VALID 192int pfn_valid(unsigned long pfn) 193{ 194 return memblock_is_memory(__pfn_to_phys(pfn)); 195} 196EXPORT_SYMBOL(pfn_valid); 197#endif 198 199#ifndef CONFIG_SPARSEMEM 200static void __init arm_memory_present(void) 201{ 202} 203#else 204static void __init arm_memory_present(void) 205{ 206 struct memblock_region *reg; 207 208 for_each_memblock(memory, reg) 209 memory_present(0, memblock_region_memory_base_pfn(reg), 210 memblock_region_memory_end_pfn(reg)); 211} 212#endif 213 214static bool arm_memblock_steal_permitted = true; 215 216phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 217{ 218 phys_addr_t phys; 219 220 BUG_ON(!arm_memblock_steal_permitted); 221 222 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 223 memblock_free(phys, size); 224 memblock_remove(phys, size); 225 226 return phys; 227} 228 229void __init arm_memblock_init(const struct machine_desc *mdesc) 230{ 231 /* Register the kernel text, kernel data and initrd with memblock. */ 232#ifdef CONFIG_XIP_KERNEL 233 memblock_reserve(__pa(_sdata), _end - _sdata); 234#else 235 memblock_reserve(__pa(_stext), _end - _stext); 236#endif 237#ifdef CONFIG_BLK_DEV_INITRD 238 /* FDT scan will populate initrd_start */ 239 if (initrd_start && !phys_initrd_size) { 240 phys_initrd_start = __virt_to_phys(initrd_start); 241 phys_initrd_size = initrd_end - initrd_start; 242 } 243 initrd_start = initrd_end = 0; 244 if (phys_initrd_size && 245 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 246 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 247 (u64)phys_initrd_start, phys_initrd_size); 248 phys_initrd_start = phys_initrd_size = 0; 249 } 250 if (phys_initrd_size && 251 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 252 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 253 (u64)phys_initrd_start, phys_initrd_size); 254 phys_initrd_start = phys_initrd_size = 0; 255 } 256 if (phys_initrd_size) { 257 memblock_reserve(phys_initrd_start, phys_initrd_size); 258 259 /* Now convert initrd to virtual addresses */ 260 initrd_start = __phys_to_virt(phys_initrd_start); 261 initrd_end = initrd_start + phys_initrd_size; 262 } 263#endif 264 265 arm_mm_memblock_reserve(); 266 267 /* reserve any platform specific memblock areas */ 268 if (mdesc->reserve) 269 mdesc->reserve(); 270 271 early_init_fdt_scan_reserved_mem(); 272 273 /* reserve memory for DMA contiguous allocations */ 274 dma_contiguous_reserve(arm_dma_limit); 275 276 arm_memblock_steal_permitted = false; 277 memblock_dump_all(); 278} 279 280void __init bootmem_init(void) 281{ 282 unsigned long min, max_low, max_high; 283 284 memblock_allow_resize(); 285 max_low = max_high = 0; 286 287 find_limits(&min, &max_low, &max_high); 288 289 early_memtest((phys_addr_t)min << PAGE_SHIFT, 290 (phys_addr_t)max_low << PAGE_SHIFT); 291 292 /* 293 * Sparsemem tries to allocate bootmem in memory_present(), 294 * so must be done after the fixed reservations 295 */ 296 arm_memory_present(); 297 298 /* 299 * sparse_init() needs the bootmem allocator up and running. 300 */ 301 sparse_init(); 302 303 /* 304 * Now free the memory - free_area_init_node needs 305 * the sparse mem_map arrays initialized by sparse_init() 306 * for memmap_init_zone(), otherwise all PFNs are invalid. 307 */ 308 zone_sizes_init(min, max_low, max_high); 309 310 /* 311 * This doesn't seem to be used by the Linux memory manager any 312 * more, but is used by ll_rw_block. If we can get rid of it, we 313 * also get rid of some of the stuff above as well. 314 */ 315 min_low_pfn = min; 316 max_low_pfn = max_low; 317 max_pfn = max_high; 318} 319 320/* 321 * Poison init memory with an undefined instruction (ARM) or a branch to an 322 * undefined instruction (Thumb). 323 */ 324static inline void poison_init_mem(void *s, size_t count) 325{ 326 u32 *p = (u32 *)s; 327 for (; count != 0; count -= 4) 328 *p++ = 0xe7fddef0; 329} 330 331static inline void 332free_memmap(unsigned long start_pfn, unsigned long end_pfn) 333{ 334 struct page *start_pg, *end_pg; 335 phys_addr_t pg, pgend; 336 337 /* 338 * Convert start_pfn/end_pfn to a struct page pointer. 339 */ 340 start_pg = pfn_to_page(start_pfn - 1) + 1; 341 end_pg = pfn_to_page(end_pfn - 1) + 1; 342 343 /* 344 * Convert to physical addresses, and 345 * round start upwards and end downwards. 346 */ 347 pg = PAGE_ALIGN(__pa(start_pg)); 348 pgend = __pa(end_pg) & PAGE_MASK; 349 350 /* 351 * If there are free pages between these, 352 * free the section of the memmap array. 353 */ 354 if (pg < pgend) 355 memblock_free_early(pg, pgend - pg); 356} 357 358/* 359 * The mem_map array can get very big. Free the unused area of the memory map. 360 */ 361static void __init free_unused_memmap(void) 362{ 363 unsigned long start, prev_end = 0; 364 struct memblock_region *reg; 365 366 /* 367 * This relies on each bank being in address order. 368 * The banks are sorted previously in bootmem_init(). 369 */ 370 for_each_memblock(memory, reg) { 371 start = memblock_region_memory_base_pfn(reg); 372 373#ifdef CONFIG_SPARSEMEM 374 /* 375 * Take care not to free memmap entries that don't exist 376 * due to SPARSEMEM sections which aren't present. 377 */ 378 start = min(start, 379 ALIGN(prev_end, PAGES_PER_SECTION)); 380#else 381 /* 382 * Align down here since the VM subsystem insists that the 383 * memmap entries are valid from the bank start aligned to 384 * MAX_ORDER_NR_PAGES. 385 */ 386 start = round_down(start, MAX_ORDER_NR_PAGES); 387#endif 388 /* 389 * If we had a previous bank, and there is a space 390 * between the current bank and the previous, free it. 391 */ 392 if (prev_end && prev_end < start) 393 free_memmap(prev_end, start); 394 395 /* 396 * Align up here since the VM subsystem insists that the 397 * memmap entries are valid from the bank end aligned to 398 * MAX_ORDER_NR_PAGES. 399 */ 400 prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 401 MAX_ORDER_NR_PAGES); 402 } 403 404#ifdef CONFIG_SPARSEMEM 405 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 406 free_memmap(prev_end, 407 ALIGN(prev_end, PAGES_PER_SECTION)); 408#endif 409} 410 411#ifdef CONFIG_HIGHMEM 412static inline void free_area_high(unsigned long pfn, unsigned long end) 413{ 414 for (; pfn < end; pfn++) 415 free_highmem_page(pfn_to_page(pfn)); 416} 417#endif 418 419static void __init free_highpages(void) 420{ 421#ifdef CONFIG_HIGHMEM 422 unsigned long max_low = max_low_pfn; 423 struct memblock_region *mem, *res; 424 425 /* set highmem page free */ 426 for_each_memblock(memory, mem) { 427 unsigned long start = memblock_region_memory_base_pfn(mem); 428 unsigned long end = memblock_region_memory_end_pfn(mem); 429 430 /* Ignore complete lowmem entries */ 431 if (end <= max_low) 432 continue; 433 434 /* Truncate partial highmem entries */ 435 if (start < max_low) 436 start = max_low; 437 438 /* Find and exclude any reserved regions */ 439 for_each_memblock(reserved, res) { 440 unsigned long res_start, res_end; 441 442 res_start = memblock_region_reserved_base_pfn(res); 443 res_end = memblock_region_reserved_end_pfn(res); 444 445 if (res_end < start) 446 continue; 447 if (res_start < start) 448 res_start = start; 449 if (res_start > end) 450 res_start = end; 451 if (res_end > end) 452 res_end = end; 453 if (res_start != start) 454 free_area_high(start, res_start); 455 start = res_end; 456 if (start == end) 457 break; 458 } 459 460 /* And now free anything which remains */ 461 if (start < end) 462 free_area_high(start, end); 463 } 464#endif 465} 466 467/* 468 * mem_init() marks the free areas in the mem_map and tells us how much 469 * memory is free. This is done after various parts of the system have 470 * claimed their memory after the kernel image. 471 */ 472void __init mem_init(void) 473{ 474#ifdef CONFIG_HAVE_TCM 475 /* These pointers are filled in on TCM detection */ 476 extern u32 dtcm_end; 477 extern u32 itcm_end; 478#endif 479 480 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 481 482 /* this will put all unused low memory onto the freelists */ 483 free_unused_memmap(); 484 free_all_bootmem(); 485 486#ifdef CONFIG_SA1111 487 /* now that our DMA memory is actually so designated, we can free it */ 488 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 489#endif 490 491 free_highpages(); 492 493 mem_init_print_info(NULL); 494 495#define MLK(b, t) b, t, ((t) - (b)) >> 10 496#define MLM(b, t) b, t, ((t) - (b)) >> 20 497#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 498 499 pr_notice("Virtual kernel memory layout:\n" 500 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 501#ifdef CONFIG_HAVE_TCM 502 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 503 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 504#endif 505 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 506 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 507 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 508#ifdef CONFIG_HIGHMEM 509 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 510#endif 511#ifdef CONFIG_MODULES 512 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 513#endif 514 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 515 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 516 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 517 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 518 519 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 520 (PAGE_SIZE)), 521#ifdef CONFIG_HAVE_TCM 522 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 523 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 524#endif 525 MLK(FIXADDR_START, FIXADDR_END), 526 MLM(VMALLOC_START, VMALLOC_END), 527 MLM(PAGE_OFFSET, (unsigned long)high_memory), 528#ifdef CONFIG_HIGHMEM 529 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 530 (PAGE_SIZE)), 531#endif 532#ifdef CONFIG_MODULES 533 MLM(MODULES_VADDR, MODULES_END), 534#endif 535 536 MLK_ROUNDUP(_text, _etext), 537 MLK_ROUNDUP(__init_begin, __init_end), 538 MLK_ROUNDUP(_sdata, _edata), 539 MLK_ROUNDUP(__bss_start, __bss_stop)); 540 541#undef MLK 542#undef MLM 543#undef MLK_ROUNDUP 544 545 /* 546 * Check boundaries twice: Some fundamental inconsistencies can 547 * be detected at build time already. 548 */ 549#ifdef CONFIG_MMU 550 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 551 BUG_ON(TASK_SIZE > MODULES_VADDR); 552#endif 553 554#ifdef CONFIG_HIGHMEM 555 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 556 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 557#endif 558 559 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 560 extern int sysctl_overcommit_memory; 561 /* 562 * On a machine this small we won't get 563 * anywhere without overcommit, so turn 564 * it on by default. 565 */ 566 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 567 } 568} 569 570#ifdef CONFIG_ARM_KERNMEM_PERMS 571struct section_perm { 572 unsigned long start; 573 unsigned long end; 574 pmdval_t mask; 575 pmdval_t prot; 576 pmdval_t clear; 577}; 578 579static struct section_perm nx_perms[] = { 580 /* Make pages tables, etc before _stext RW (set NX). */ 581 { 582 .start = PAGE_OFFSET, 583 .end = (unsigned long)_stext, 584 .mask = ~PMD_SECT_XN, 585 .prot = PMD_SECT_XN, 586 }, 587 /* Make init RW (set NX). */ 588 { 589 .start = (unsigned long)__init_begin, 590 .end = (unsigned long)_sdata, 591 .mask = ~PMD_SECT_XN, 592 .prot = PMD_SECT_XN, 593 }, 594#ifdef CONFIG_DEBUG_RODATA 595 /* Make rodata NX (set RO in ro_perms below). */ 596 { 597 .start = (unsigned long)__start_rodata, 598 .end = (unsigned long)__init_begin, 599 .mask = ~PMD_SECT_XN, 600 .prot = PMD_SECT_XN, 601 }, 602#endif 603}; 604 605#ifdef CONFIG_DEBUG_RODATA 606static struct section_perm ro_perms[] = { 607 /* Make kernel code and rodata RX (set RO). */ 608 { 609 .start = (unsigned long)_stext, 610 .end = (unsigned long)__init_begin, 611#ifdef CONFIG_ARM_LPAE 612 .mask = ~L_PMD_SECT_RDONLY, 613 .prot = L_PMD_SECT_RDONLY, 614#else 615 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 616 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 617 .clear = PMD_SECT_AP_WRITE, 618#endif 619 }, 620}; 621#endif 622 623/* 624 * Updates section permissions only for the current mm (sections are 625 * copied into each mm). During startup, this is the init_mm. Is only 626 * safe to be called with preemption disabled, as under stop_machine(). 627 */ 628static inline void section_update(unsigned long addr, pmdval_t mask, 629 pmdval_t prot) 630{ 631 struct mm_struct *mm; 632 pmd_t *pmd; 633 634 mm = current->active_mm; 635 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 636 637#ifdef CONFIG_ARM_LPAE 638 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 639#else 640 if (addr & SECTION_SIZE) 641 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 642 else 643 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 644#endif 645 flush_pmd_entry(pmd); 646 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 647} 648 649/* Make sure extended page tables are in use. */ 650static inline bool arch_has_strict_perms(void) 651{ 652 if (cpu_architecture() < CPU_ARCH_ARMv6) 653 return false; 654 655 return !!(get_cr() & CR_XP); 656} 657 658#define set_section_perms(perms, field) { \ 659 size_t i; \ 660 unsigned long addr; \ 661 \ 662 if (!arch_has_strict_perms()) \ 663 return; \ 664 \ 665 for (i = 0; i < ARRAY_SIZE(perms); i++) { \ 666 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || \ 667 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { \ 668 pr_err("BUG: section %lx-%lx not aligned to %lx\n", \ 669 perms[i].start, perms[i].end, \ 670 SECTION_SIZE); \ 671 continue; \ 672 } \ 673 \ 674 for (addr = perms[i].start; \ 675 addr < perms[i].end; \ 676 addr += SECTION_SIZE) \ 677 section_update(addr, perms[i].mask, \ 678 perms[i].field); \ 679 } \ 680} 681 682static inline void fix_kernmem_perms(void) 683{ 684 set_section_perms(nx_perms, prot); 685} 686 687#ifdef CONFIG_DEBUG_RODATA 688void mark_rodata_ro(void) 689{ 690 set_section_perms(ro_perms, prot); 691} 692 693void set_kernel_text_rw(void) 694{ 695 set_section_perms(ro_perms, clear); 696} 697 698void set_kernel_text_ro(void) 699{ 700 set_section_perms(ro_perms, prot); 701} 702#endif /* CONFIG_DEBUG_RODATA */ 703 704#else 705static inline void fix_kernmem_perms(void) { } 706#endif /* CONFIG_ARM_KERNMEM_PERMS */ 707 708void free_tcmmem(void) 709{ 710#ifdef CONFIG_HAVE_TCM 711 extern char __tcm_start, __tcm_end; 712 713 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 714 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 715#endif 716} 717 718void free_initmem(void) 719{ 720 fix_kernmem_perms(); 721 free_tcmmem(); 722 723 poison_init_mem(__init_begin, __init_end - __init_begin); 724 if (!machine_is_integrator() && !machine_is_cintegrator()) 725 free_initmem_default(-1); 726} 727 728#ifdef CONFIG_BLK_DEV_INITRD 729 730static int keep_initrd; 731 732void free_initrd_mem(unsigned long start, unsigned long end) 733{ 734 if (!keep_initrd) { 735 if (start == initrd_start) 736 start = round_down(start, PAGE_SIZE); 737 if (end == initrd_end) 738 end = round_up(end, PAGE_SIZE); 739 740 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 741 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 742 } 743} 744 745static int __init keepinitrd_setup(char *__unused) 746{ 747 keep_initrd = 1; 748 return 1; 749} 750 751__setup("keepinitrd", keepinitrd_setup); 752#endif 753