arch/arm/mm/init.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/mm/init.c
   4  *
   5  *  Copyright (C) 1995-2005 Russell King
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/errno.h>
   9 #include <linux/swap.h>
  10 #include <linux/init.h>
  11 #include <linux/mman.h>
  12 #include <linux/sched/signal.h>
  13 #include <linux/sched/task.h>
  14 #include <linux/export.h>
  15 #include <linux/nodemask.h>
  16 #include <linux/initrd.h>
  17 #include <linux/of_fdt.h>
  18 #include <linux/highmem.h>
  19 #include <linux/gfp.h>
  20 #include <linux/memblock.h>
  21 #include <linux/dma-contiguous.h>
  22 #include <linux/sizes.h>
  23 #include <linux/stop_machine.h>
  24 #include <linux/swiotlb.h>
  25
  26 #include <asm/cp15.h>
  27 #include <asm/mach-types.h>
  28 #include <asm/memblock.h>
  29 #include <asm/memory.h>
  30 #include <asm/prom.h>
  31 #include <asm/sections.h>
  32 #include <asm/setup.h>
  33 #include <asm/system_info.h>
  34 #include <asm/tlb.h>
  35 #include <asm/fixmap.h>
  36 #include <asm/ptdump.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/map.h>
  40
  41 #include "mm.h"
  42
  43 #ifdef CONFIG_CPU_CP15_MMU
  44 unsigned long __init __clear_cr(unsigned long mask)
  45 {
  46         cr_alignment = cr_alignment & ~mask;
  47         return cr_alignment;
  48 }
  49 #endif
  50
  51 #ifdef CONFIG_BLK_DEV_INITRD
  52 static int __init parse_tag_initrd(const struct tag *tag)
  53 {
  54         pr_warn("ATAG_INITRD is deprecated; "
  55                 "please update your bootloader.\n");
  56         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  57         phys_initrd_size = tag->u.initrd.size;
  58         return 0;
  59 }
  60
  61 __tagtable(ATAG_INITRD, parse_tag_initrd);
  62
  63 static int __init parse_tag_initrd2(const struct tag *tag)
  64 {
  65         phys_initrd_start = tag->u.initrd.start;
  66         phys_initrd_size = tag->u.initrd.size;
  67         return 0;
  68 }
  69
  70 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  71 #endif
  72
  73 static void __init find_limits(unsigned long *min, unsigned long *max_low,
  74                                unsigned long *max_high)
  75 {
  76         *max_low = PFN_DOWN(memblock_get_current_limit());
  77         *min = PFN_UP(memblock_start_of_DRAM());
  78         *max_high = PFN_DOWN(memblock_end_of_DRAM());
  79 }
  80
  81 #ifdef CONFIG_ZONE_DMA
  82
  83 phys_addr_t arm_dma_zone_size __read_mostly;
  84 EXPORT_SYMBOL(arm_dma_zone_size);
  85
  86 /*
  87  * The DMA mask corresponding to the maximum bus address allocatable
  88  * using GFP_DMA.  The default here places no restriction on DMA
  89  * allocations.  This must be the smallest DMA mask in the system,
  90  * so a successful GFP_DMA allocation will always satisfy this.
  91  */
  92 phys_addr_t arm_dma_limit;
  93 unsigned long arm_dma_pfn_limit;
  94
  95 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
  96         unsigned long dma_size)
  97 {
  98         if (size[0] <= dma_size)
  99                 return;
 100
 101         size[ZONE_NORMAL] = size[0] - dma_size;
 102         size[ZONE_DMA] = dma_size;
 103         hole[ZONE_NORMAL] = hole[0];
 104         hole[ZONE_DMA] = 0;
 105 }
 106 #endif
 107
 108 void __init setup_dma_zone(const struct machine_desc *mdesc)
 109 {
 110 #ifdef CONFIG_ZONE_DMA
 111         if (mdesc->dma_zone_size) {
 112                 arm_dma_zone_size = mdesc->dma_zone_size;
 113                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 114         } else
 115                 arm_dma_limit = 0xffffffff;
 116         arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT;
 117 #endif
 118 }
 119
 120 static void __init zone_sizes_init(unsigned long min, unsigned long max_low,
 121         unsigned long max_high)
 122 {
 123         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 124         struct memblock_region *reg;
 125
 126         /*
 127          * initialise the zones.
 128          */
 129         memset(zone_size, 0, sizeof(zone_size));
 130
 131         /*
 132          * The memory size has already been determined.  If we need
 133          * to do anything fancy with the allocation of this memory
 134          * to the zones, now is the time to do it.
 135          */
 136         zone_size[0] = max_low - min;
 137 #ifdef CONFIG_HIGHMEM
 138         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 139 #endif
 140
 141         /*
 142          * Calculate the size of the holes.
 143          *  holes = node_size - sum(bank_sizes)
 144          */
 145         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 146         for_each_memblock(memory, reg) {
 147                 unsigned long start = memblock_region_memory_base_pfn(reg);
 148                 unsigned long end = memblock_region_memory_end_pfn(reg);
 149
 150                 if (start < max_low) {
 151                         unsigned long low_end = min(end, max_low);
 152                         zhole_size[0] -= low_end - start;
 153                 }
 154 #ifdef CONFIG_HIGHMEM
 155                 if (end > max_low) {
 156                         unsigned long high_start = max(start, max_low);
 157                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 158                 }
 159 #endif
 160         }
 161
 162 #ifdef CONFIG_ZONE_DMA
 163         /*
 164          * Adjust the sizes according to any special requirements for
 165          * this machine type.
 166          */
 167         if (arm_dma_zone_size)
 168                 arm_adjust_dma_zone(zone_size, zhole_size,
 169                         arm_dma_zone_size >> PAGE_SHIFT);
 170 #endif
 171
 172         free_area_init_node(0, zone_size, min, zhole_size);
 173 }
 174
 175 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 176 int pfn_valid(unsigned long pfn)
 177 {
 178         return memblock_is_map_memory(__pfn_to_phys(pfn));
 179 }
 180 EXPORT_SYMBOL(pfn_valid);
 181 #endif
 182
 183 static bool arm_memblock_steal_permitted = true;
 184
 185 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 186 {
 187         phys_addr_t phys;
 188
 189         BUG_ON(!arm_memblock_steal_permitted);
 190
 191         phys = memblock_phys_alloc(size, align);
 192         if (!phys)
 193                 panic("Failed to steal %pa bytes at %pS\n",
 194                       &size, (void *)_RET_IP_);
 195
 196         memblock_free(phys, size);
 197         memblock_remove(phys, size);
 198
 199         return phys;
 200 }
 201
 202 static void __init arm_initrd_init(void)
 203 {
 204 #ifdef CONFIG_BLK_DEV_INITRD
 205         phys_addr_t start;
 206         unsigned long size;
 207
 208         initrd_start = initrd_end = 0;
 209
 210         if (!phys_initrd_size)
 211                 return;
 212
 213         /*
 214          * Round the memory region to page boundaries as per free_initrd_mem()
 215          * This allows us to detect whether the pages overlapping the initrd
 216          * are in use, but more importantly, reserves the entire set of pages
 217          * as we don't want these pages allocated for other purposes.
 218          */
 219         start = round_down(phys_initrd_start, PAGE_SIZE);
 220         size = phys_initrd_size + (phys_initrd_start - start);
 221         size = round_up(size, PAGE_SIZE);
 222
 223         if (!memblock_is_region_memory(start, size)) {
 224                 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
 225                        (u64)start, size);
 226                 return;
 227         }
 228
 229         if (memblock_is_region_reserved(start, size)) {
 230                 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 231                        (u64)start, size);
 232                 return;
 233         }
 234
 235         memblock_reserve(start, size);
 236
 237         /* Now convert initrd to virtual addresses */
 238         initrd_start = __phys_to_virt(phys_initrd_start);
 239         initrd_end = initrd_start + phys_initrd_size;
 240 #endif
 241 }
 242
 243 #ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
 244 void check_cpu_icache_size(int cpuid)
 245 {
 246         u32 size, ctr;
 247
 248         asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
 249
 250         size = 1 << ((ctr & 0xf) + 2);
 251         if (cpuid != 0 && icache_size != size)
 252                 pr_info("CPU%u: detected I-Cache line size mismatch, workaround enabled\n",
 253                         cpuid);
 254         if (icache_size > size)
 255                 icache_size = size;
 256 }
 257 #endif
 258
 259 void __init arm_memblock_init(const struct machine_desc *mdesc)
 260 {
 261         /* Register the kernel text, kernel data and initrd with memblock. */
 262         memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START);
 263
 264         arm_initrd_init();
 265
 266         arm_mm_memblock_reserve();
 267
 268         /* reserve any platform specific memblock areas */
 269         if (mdesc->reserve)
 270                 mdesc->reserve();
 271
 272         early_init_fdt_reserve_self();
 273         early_init_fdt_scan_reserved_mem();
 274
 275         /* reserve memory for DMA contiguous allocations */
 276         dma_contiguous_reserve(arm_dma_limit);
 277
 278         arm_memblock_steal_permitted = false;
 279         memblock_dump_all();
 280 }
 281
 282 void __init bootmem_init(void)
 283 {
 284         memblock_allow_resize();
 285
 286         find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
 287
 288         early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT,
 289                       (phys_addr_t)max_low_pfn << PAGE_SHIFT);
 290
 291         /*
 292          * Sparsemem tries to allocate bootmem in memory_present(),
 293          * so must be done after the fixed reservations
 294          */
 295         memblocks_present();
 296
 297         /*
 298          * sparse_init() needs the bootmem allocator up and running.
 299          */
 300         sparse_init();
 301
 302         /*
 303          * Now free the memory - free_area_init_node needs
 304          * the sparse mem_map arrays initialized by sparse_init()
 305          * for memmap_init_zone(), otherwise all PFNs are invalid.
 306          */
 307         zone_sizes_init(min_low_pfn, max_low_pfn, max_pfn);
 308 }
 309
 310 /*
 311  * Poison init memory with an undefined instruction (ARM) or a branch to an
 312  * undefined instruction (Thumb).
 313  */
 314 static inline void poison_init_mem(void *s, size_t count)
 315 {
 316         u32 *p = (u32 *)s;
 317         for (; count != 0; count -= 4)
 318                 *p++ = 0xe7fddef0;
 319 }
 320
 321 static inline void
 322 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 323 {
 324         struct page *start_pg, *end_pg;
 325         phys_addr_t pg, pgend;
 326
 327         /*
 328          * Convert start_pfn/end_pfn to a struct page pointer.
 329          */
 330         start_pg = pfn_to_page(start_pfn - 1) + 1;
 331         end_pg = pfn_to_page(end_pfn - 1) + 1;
 332
 333         /*
 334          * Convert to physical addresses, and
 335          * round start upwards and end downwards.
 336          */
 337         pg = PAGE_ALIGN(__pa(start_pg));
 338         pgend = __pa(end_pg) & PAGE_MASK;
 339
 340         /*
 341          * If there are free pages between these,
 342          * free the section of the memmap array.
 343          */
 344         if (pg < pgend)
 345                 memblock_free_early(pg, pgend - pg);
 346 }
 347
 348 /*
 349  * The mem_map array can get very big.  Free the unused area of the memory map.
 350  */
 351 static void __init free_unused_memmap(void)
 352 {
 353         unsigned long start, prev_end = 0;
 354         struct memblock_region *reg;
 355
 356         /*
 357          * This relies on each bank being in address order.
 358          * The banks are sorted previously in bootmem_init().
 359          */
 360         for_each_memblock(memory, reg) {
 361                 start = memblock_region_memory_base_pfn(reg);
 362
 363 #ifdef CONFIG_SPARSEMEM
 364                 /*
 365                  * Take care not to free memmap entries that don't exist
 366                  * due to SPARSEMEM sections which aren't present.
 367                  */
 368                 start = min(start,
 369                                  ALIGN(prev_end, PAGES_PER_SECTION));
 370 #else
 371                 /*
 372                  * Align down here since the VM subsystem insists that the
 373                  * memmap entries are valid from the bank start aligned to
 374                  * MAX_ORDER_NR_PAGES.
 375                  */
 376                 start = round_down(start, MAX_ORDER_NR_PAGES);
 377 #endif
 378                 /*
 379                  * If we had a previous bank, and there is a space
 380                  * between the current bank and the previous, free it.
 381                  */
 382                 if (prev_end && prev_end < start)
 383                         free_memmap(prev_end, start);
 384
 385                 /*
 386                  * Align up here since the VM subsystem insists that the
 387                  * memmap entries are valid from the bank end aligned to
 388                  * MAX_ORDER_NR_PAGES.
 389                  */
 390                 prev_end = ALIGN(memblock_region_memory_end_pfn(reg),
 391                                  MAX_ORDER_NR_PAGES);
 392         }
 393
 394 #ifdef CONFIG_SPARSEMEM
 395         if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
 396                 free_memmap(prev_end,
 397                             ALIGN(prev_end, PAGES_PER_SECTION));
 398 #endif
 399 }
 400
 401 #ifdef CONFIG_HIGHMEM
 402 static inline void free_area_high(unsigned long pfn, unsigned long end)
 403 {
 404         for (; pfn < end; pfn++)
 405                 free_highmem_page(pfn_to_page(pfn));
 406 }
 407 #endif
 408
 409 static void __init free_highpages(void)
 410 {
 411 #ifdef CONFIG_HIGHMEM
 412         unsigned long max_low = max_low_pfn;
 413         struct memblock_region *mem, *res;
 414
 415         /* set highmem page free */
 416         for_each_memblock(memory, mem) {
 417                 unsigned long start = memblock_region_memory_base_pfn(mem);
 418                 unsigned long end = memblock_region_memory_end_pfn(mem);
 419
 420                 /* Ignore complete lowmem entries */
 421                 if (end <= max_low)
 422                         continue;
 423
 424                 if (memblock_is_nomap(mem))
 425                         continue;
 426
 427                 /* Truncate partial highmem entries */
 428                 if (start < max_low)
 429                         start = max_low;
 430
 431                 /* Find and exclude any reserved regions */
 432                 for_each_memblock(reserved, res) {
 433                         unsigned long res_start, res_end;
 434
 435                         res_start = memblock_region_reserved_base_pfn(res);
 436                         res_end = memblock_region_reserved_end_pfn(res);
 437
 438                         if (res_end < start)
 439                                 continue;
 440                         if (res_start < start)
 441                                 res_start = start;
 442                         if (res_start > end)
 443                                 res_start = end;
 444                         if (res_end > end)
 445                                 res_end = end;
 446                         if (res_start != start)
 447                                 free_area_high(start, res_start);
 448                         start = res_end;
 449                         if (start == end)
 450                                 break;
 451                 }
 452
 453                 /* And now free anything which remains */
 454                 if (start < end)
 455                         free_area_high(start, end);
 456         }
 457 #endif
 458 }
 459
 460 /*
 461  * mem_init() marks the free areas in the mem_map and tells us how much
 462  * memory is free.  This is done after various parts of the system have
 463  * claimed their memory after the kernel image.
 464  */
 465 void __init mem_init(void)
 466 {
 467 #ifdef CONFIG_ARM_LPAE
 468         swiotlb_init(1);
 469 #endif
 470
 471         set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
 472
 473         /* this will put all unused low memory onto the freelists */
 474         free_unused_memmap();
 475         memblock_free_all();
 476
 477 #ifdef CONFIG_SA1111
 478         /* now that our DMA memory is actually so designated, we can free it */
 479         free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
 480 #endif
 481
 482         free_highpages();
 483
 484         mem_init_print_info(NULL);
 485
 486         /*
 487          * Check boundaries twice: Some fundamental inconsistencies can
 488          * be detected at build time already.
 489          */
 490 #ifdef CONFIG_MMU
 491         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 492         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 493 #endif
 494
 495 #ifdef CONFIG_HIGHMEM
 496         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 497         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 498 #endif
 499 }
 500
 501 #ifdef CONFIG_STRICT_KERNEL_RWX
 502 struct section_perm {
 503         const char *name;
 504         unsigned long start;
 505         unsigned long end;
 506         pmdval_t mask;
 507         pmdval_t prot;
 508         pmdval_t clear;
 509 };
 510
 511 /* First section-aligned location at or after __start_rodata. */
 512 extern char __start_rodata_section_aligned[];
 513
 514 static struct section_perm nx_perms[] = {
 515         /* Make pages tables, etc before _stext RW (set NX). */
 516         {
 517                 .name   = "pre-text NX",
 518                 .start  = PAGE_OFFSET,
 519                 .end    = (unsigned long)_stext,
 520                 .mask   = ~PMD_SECT_XN,
 521                 .prot   = PMD_SECT_XN,
 522         },
 523         /* Make init RW (set NX). */
 524         {
 525                 .name   = "init NX",
 526                 .start  = (unsigned long)__init_begin,
 527                 .end    = (unsigned long)_sdata,
 528                 .mask   = ~PMD_SECT_XN,
 529                 .prot   = PMD_SECT_XN,
 530         },
 531         /* Make rodata NX (set RO in ro_perms below). */
 532         {
 533                 .name   = "rodata NX",
 534                 .start  = (unsigned long)__start_rodata_section_aligned,
 535                 .end    = (unsigned long)__init_begin,
 536                 .mask   = ~PMD_SECT_XN,
 537                 .prot   = PMD_SECT_XN,
 538         },
 539 };
 540
 541 static struct section_perm ro_perms[] = {
 542         /* Make kernel code and rodata RX (set RO). */
 543         {
 544                 .name   = "text/rodata RO",
 545                 .start  = (unsigned long)_stext,
 546                 .end    = (unsigned long)__init_begin,
 547 #ifdef CONFIG_ARM_LPAE
 548                 .mask   = ~(L_PMD_SECT_RDONLY | PMD_SECT_AP2),
 549                 .prot   = L_PMD_SECT_RDONLY | PMD_SECT_AP2,
 550 #else
 551                 .mask   = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE),
 552                 .prot   = PMD_SECT_APX | PMD_SECT_AP_WRITE,
 553                 .clear  = PMD_SECT_AP_WRITE,
 554 #endif
 555         },
 556 };
 557
 558 /*
 559  * Updates section permissions only for the current mm (sections are
 560  * copied into each mm). During startup, this is the init_mm. Is only
 561  * safe to be called with preemption disabled, as under stop_machine().
 562  */
 563 static inline void section_update(unsigned long addr, pmdval_t mask,
 564                                   pmdval_t prot, struct mm_struct *mm)
 565 {
 566         pmd_t *pmd;
 567
 568         pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr);
 569
 570 #ifdef CONFIG_ARM_LPAE
 571         pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
 572 #else
 573         if (addr & SECTION_SIZE)
 574                 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot);
 575         else
 576                 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
 577 #endif
 578         flush_pmd_entry(pmd);
 579         local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE);
 580 }
 581
 582 /* Make sure extended page tables are in use. */
 583 static inline bool arch_has_strict_perms(void)
 584 {
 585         if (cpu_architecture() < CPU_ARCH_ARMv6)
 586                 return false;
 587
 588         return !!(get_cr() & CR_XP);
 589 }
 590
 591 void set_section_perms(struct section_perm *perms, int n, bool set,
 592                         struct mm_struct *mm)
 593 {
 594         size_t i;
 595         unsigned long addr;
 596
 597         if (!arch_has_strict_perms())
 598                 return;
 599
 600         for (i = 0; i < n; i++) {
 601                 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) ||
 602                     !IS_ALIGNED(perms[i].end, SECTION_SIZE)) {
 603                         pr_err("BUG: %s section %lx-%lx not aligned to %lx\n",
 604                                 perms[i].name, perms[i].start, perms[i].end,
 605                                 SECTION_SIZE);
 606                         continue;
 607                 }
 608
 609                 for (addr = perms[i].start;
 610                      addr < perms[i].end;
 611                      addr += SECTION_SIZE)
 612                         section_update(addr, perms[i].mask,
 613                                 set ? perms[i].prot : perms[i].clear, mm);
 614         }
 615
 616 }
 617
 618 /**
 619  * update_sections_early intended to be called only through stop_machine
 620  * framework and executed by only one CPU while all other CPUs will spin and
 621  * wait, so no locking is required in this function.
 622  */
 623 static void update_sections_early(struct section_perm perms[], int n)
 624 {
 625         struct task_struct *t, *s;
 626
 627         for_each_process(t) {
 628                 if (t->flags & PF_KTHREAD)
 629                         continue;
 630                 for_each_thread(t, s)
 631                         set_section_perms(perms, n, true, s->mm);
 632         }
 633         set_section_perms(perms, n, true, current->active_mm);
 634         set_section_perms(perms, n, true, &init_mm);
 635 }
 636
 637 static int __fix_kernmem_perms(void *unused)
 638 {
 639         update_sections_early(nx_perms, ARRAY_SIZE(nx_perms));
 640         return 0;
 641 }
 642
 643 static void fix_kernmem_perms(void)
 644 {
 645         stop_machine(__fix_kernmem_perms, NULL, NULL);
 646 }
 647
 648 static int __mark_rodata_ro(void *unused)
 649 {
 650         update_sections_early(ro_perms, ARRAY_SIZE(ro_perms));
 651         return 0;
 652 }
 653
 654 static int kernel_set_to_readonly __read_mostly;
 655
 656 void mark_rodata_ro(void)
 657 {
 658         kernel_set_to_readonly = 1;
 659         stop_machine(__mark_rodata_ro, NULL, NULL);
 660         debug_checkwx();
 661 }
 662
 663 void set_kernel_text_rw(void)
 664 {
 665         if (!kernel_set_to_readonly)
 666                 return;
 667
 668         set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false,
 669                                 current->active_mm);
 670 }
 671
 672 void set_kernel_text_ro(void)
 673 {
 674         if (!kernel_set_to_readonly)
 675                 return;
 676
 677         set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true,
 678                                 current->active_mm);
 679 }
 680
 681 #else
 682 static inline void fix_kernmem_perms(void) { }
 683 #endif /* CONFIG_STRICT_KERNEL_RWX */
 684
 685 void free_initmem(void)
 686 {
 687         fix_kernmem_perms();
 688
 689         poison_init_mem(__init_begin, __init_end - __init_begin);
 690         if (!machine_is_integrator() && !machine_is_cintegrator())
 691                 free_initmem_default(-1);
 692 }
 693
 694 #ifdef CONFIG_BLK_DEV_INITRD
 695 void free_initrd_mem(unsigned long start, unsigned long end)
 696 {
 697         if (start == initrd_start)
 698                 start = round_down(start, PAGE_SIZE);
 699         if (end == initrd_end)
 700                 end = round_up(end, PAGE_SIZE);
 701
 702         poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 703         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 704 }
 705 #endif