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/set_memory.h>
  34 #include <asm/system_info.h>
  35 #include <asm/tlb.h>
  36 #include <asm/fixmap.h>
  37 #include <asm/ptdump.h>
  38
  39 #include <asm/mach/arch.h>
  40 #include <asm/mach/map.h>
  41
  42 #include "mm.h"
  43
  44 #ifdef CONFIG_CPU_CP15_MMU
  45 unsigned long __init __clear_cr(unsigned long mask)
  46 {
  47         cr_alignment = cr_alignment & ~mask;
  48         return cr_alignment;
  49 }
  50 #endif
  51
  52 #ifdef CONFIG_BLK_DEV_INITRD
  53 static int __init parse_tag_initrd(const struct tag *tag)
  54 {
  55         pr_warn("ATAG_INITRD is deprecated; "
  56                 "please update your bootloader.\n");
  57         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  58         phys_initrd_size = tag->u.initrd.size;
  59         return 0;
  60 }
  61
  62 __tagtable(ATAG_INITRD, parse_tag_initrd);
  63
  64 static int __init parse_tag_initrd2(const struct tag *tag)
  65 {
  66         phys_initrd_start = tag->u.initrd.start;
  67         phys_initrd_size = tag->u.initrd.size;
  68         return 0;
  69 }
  70
  71 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  72 #endif
  73
  74 static void __init find_limits(unsigned long *min, unsigned long *max_low,
  75                                unsigned long *max_high)
  76 {
  77         *max_low = PFN_DOWN(memblock_get_current_limit());
  78         *min = PFN_UP(memblock_start_of_DRAM());
  79         *max_high = PFN_DOWN(memblock_end_of_DRAM());
  80 }
  81
  82 #ifdef CONFIG_ZONE_DMA
  83
  84 phys_addr_t arm_dma_zone_size __read_mostly;
  85 EXPORT_SYMBOL(arm_dma_zone_size);
  86
  87 /*
  88  * The DMA mask corresponding to the maximum bus address allocatable
  89  * using GFP_DMA.  The default here places no restriction on DMA
  90  * allocations.  This must be the smallest DMA mask in the system,
  91  * so a successful GFP_DMA allocation will always satisfy this.
  92  */
  93 phys_addr_t arm_dma_limit;
  94 unsigned long arm_dma_pfn_limit;
  95
  96 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
  97         unsigned long dma_size)
  98 {
  99         if (size[0] <= dma_size)
 100                 return;
 101
 102         size[ZONE_NORMAL] = size[0] - dma_size;
 103         size[ZONE_DMA] = dma_size;
 104         hole[ZONE_NORMAL] = hole[0];
 105         hole[ZONE_DMA] = 0;
 106 }
 107 #endif
 108
 109 void __init setup_dma_zone(const struct machine_desc *mdesc)
 110 {
 111 #ifdef CONFIG_ZONE_DMA
 112         if (mdesc->dma_zone_size) {
 113                 arm_dma_zone_size = mdesc->dma_zone_size;
 114                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 115         } else
 116                 arm_dma_limit = 0xffffffff;
 117         arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT;
 118 #endif
 119 }
 120
 121 static void __init zone_sizes_init(unsigned long min, unsigned long max_low,
 122         unsigned long max_high)
 123 {
 124         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 125         struct memblock_region *reg;
 126
 127         /*
 128          * initialise the zones.
 129          */
 130         memset(zone_size, 0, sizeof(zone_size));
 131
 132         /*
 133          * The memory size has already been determined.  If we need
 134          * to do anything fancy with the allocation of this memory
 135          * to the zones, now is the time to do it.
 136          */
 137         zone_size[0] = max_low - min;
 138 #ifdef CONFIG_HIGHMEM
 139         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 140 #endif
 141
 142         /*
 143          * Calculate the size of the holes.
 144          *  holes = node_size - sum(bank_sizes)
 145          */
 146         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 147         for_each_memblock(memory, reg) {
 148                 unsigned long start = memblock_region_memory_base_pfn(reg);
 149                 unsigned long end = memblock_region_memory_end_pfn(reg);
 150
 151                 if (start < max_low) {
 152                         unsigned long low_end = min(end, max_low);
 153                         zhole_size[0] -= low_end - start;
 154                 }
 155 #ifdef CONFIG_HIGHMEM
 156                 if (end > max_low) {
 157                         unsigned long high_start = max(start, max_low);
 158                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 159                 }
 160 #endif
 161         }
 162
 163 #ifdef CONFIG_ZONE_DMA
 164         /*
 165          * Adjust the sizes according to any special requirements for
 166          * this machine type.
 167          */
 168         if (arm_dma_zone_size)
 169                 arm_adjust_dma_zone(zone_size, zhole_size,
 170                         arm_dma_zone_size >> PAGE_SHIFT);
 171 #endif
 172
 173         free_area_init_node(0, zone_size, min, zhole_size);
 174 }
 175
 176 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 177 int pfn_valid(unsigned long pfn)
 178 {
 179         phys_addr_t addr = __pfn_to_phys(pfn);
 180
 181         if (__phys_to_pfn(addr) != pfn)
 182                 return 0;
 183
 184         return memblock_is_map_memory(addr);
 185 }
 186 EXPORT_SYMBOL(pfn_valid);
 187 #endif
 188
 189 static bool arm_memblock_steal_permitted = true;
 190
 191 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 192 {
 193         phys_addr_t phys;
 194
 195         BUG_ON(!arm_memblock_steal_permitted);
 196
 197         phys = memblock_phys_alloc(size, align);
 198         if (!phys)
 199                 panic("Failed to steal %pa bytes at %pS\n",
 200                       &size, (void *)_RET_IP_);
 201
 202         memblock_free(phys, size);
 203         memblock_remove(phys, size);
 204
 205         return phys;
 206 }
 207
 208 static void __init arm_initrd_init(void)
 209 {
 210 #ifdef CONFIG_BLK_DEV_INITRD
 211         phys_addr_t start;
 212         unsigned long size;
 213
 214         initrd_start = initrd_end = 0;
 215
 216         if (!phys_initrd_size)
 217                 return;
 218
 219         /*
 220          * Round the memory region to page boundaries as per free_initrd_mem()
 221          * This allows us to detect whether the pages overlapping the initrd
 222          * are in use, but more importantly, reserves the entire set of pages
 223          * as we don't want these pages allocated for other purposes.
 224          */
 225         start = round_down(phys_initrd_start, PAGE_SIZE);
 226         size = phys_initrd_size + (phys_initrd_start - start);
 227         size = round_up(size, PAGE_SIZE);
 228
 229         if (!memblock_is_region_memory(start, size)) {
 230                 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
 231                        (u64)start, size);
 232                 return;
 233         }
 234
 235         if (memblock_is_region_reserved(start, size)) {
 236                 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 237                        (u64)start, size);
 238                 return;
 239         }
 240
 241         memblock_reserve(start, size);
 242
 243         /* Now convert initrd to virtual addresses */
 244         initrd_start = __phys_to_virt(phys_initrd_start);
 245         initrd_end = initrd_start + phys_initrd_size;
 246 #endif
 247 }
 248
 249 #ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
 250 void check_cpu_icache_size(int cpuid)
 251 {
 252         u32 size, ctr;
 253
 254         asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
 255
 256         size = 1 << ((ctr & 0xf) + 2);
 257         if (cpuid != 0 && icache_size != size)
 258                 pr_info("CPU%u: detected I-Cache line size mismatch, workaround enabled\n",
 259                         cpuid);
 260         if (icache_size > size)
 261                 icache_size = size;
 262 }
 263 #endif
 264
 265 void __init arm_memblock_init(const struct machine_desc *mdesc)
 266 {
 267         /* Register the kernel text, kernel data and initrd with memblock. */
 268         memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START);
 269
 270         arm_initrd_init();
 271
 272         arm_mm_memblock_reserve();
 273
 274         /* reserve any platform specific memblock areas */
 275         if (mdesc->reserve)
 276                 mdesc->reserve();
 277
 278         early_init_fdt_reserve_self();
 279         early_init_fdt_scan_reserved_mem();
 280
 281         /* reserve memory for DMA contiguous allocations */
 282         dma_contiguous_reserve(arm_dma_limit);
 283
 284         arm_memblock_steal_permitted = false;
 285         memblock_dump_all();
 286 }
 287
 288 void __init bootmem_init(void)
 289 {
 290         memblock_allow_resize();
 291
 292         find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
 293
 294         early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT,
 295                       (phys_addr_t)max_low_pfn << PAGE_SHIFT);
 296
 297         /*
 298          * Sparsemem tries to allocate bootmem in memory_present(),
 299          * so must be done after the fixed reservations
 300          */
 301         memblocks_present();
 302
 303         /*
 304          * sparse_init() needs the bootmem allocator up and running.
 305          */
 306         sparse_init();
 307
 308         /*
 309          * Now free the memory - free_area_init_node needs
 310          * the sparse mem_map arrays initialized by sparse_init()
 311          * for memmap_init_zone(), otherwise all PFNs are invalid.
 312          */
 313         zone_sizes_init(min_low_pfn, max_low_pfn, max_pfn);
 314 }
 315
 316 /*
 317  * Poison init memory with an undefined instruction (ARM) or a branch to an
 318  * undefined instruction (Thumb).
 319  */
 320 static inline void poison_init_mem(void *s, size_t count)
 321 {
 322         u32 *p = (u32 *)s;
 323         for (; count != 0; count -= 4)
 324                 *p++ = 0xe7fddef0;
 325 }
 326
 327 static inline void __init
 328 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 329 {
 330         struct page *start_pg, *end_pg;
 331         phys_addr_t pg, pgend;
 332
 333         /*
 334          * Convert start_pfn/end_pfn to a struct page pointer.
 335          */
 336         start_pg = pfn_to_page(start_pfn - 1) + 1;
 337         end_pg = pfn_to_page(end_pfn - 1) + 1;
 338
 339         /*
 340          * Convert to physical addresses, and
 341          * round start upwards and end downwards.
 342          */
 343         pg = PAGE_ALIGN(__pa(start_pg));
 344         pgend = __pa(end_pg) & PAGE_MASK;
 345
 346         /*
 347          * If there are free pages between these,
 348          * free the section of the memmap array.
 349          */
 350         if (pg < pgend)
 351                 memblock_free_early(pg, pgend - pg);
 352 }
 353
 354 /*
 355  * The mem_map array can get very big.  Free the unused area of the memory map.
 356  */
 357 static void __init free_unused_memmap(void)
 358 {
 359         unsigned long start, prev_end = 0;
 360         struct memblock_region *reg;
 361
 362         /*
 363          * This relies on each bank being in address order.
 364          * The banks are sorted previously in bootmem_init().
 365          */
 366         for_each_memblock(memory, reg) {
 367                 start = memblock_region_memory_base_pfn(reg);
 368
 369 #ifdef CONFIG_SPARSEMEM
 370                 /*
 371                  * Take care not to free memmap entries that don't exist
 372                  * due to SPARSEMEM sections which aren't present.
 373                  */
 374                 start = min(start,
 375                                  ALIGN(prev_end, PAGES_PER_SECTION));
 376 #else
 377                 /*
 378                  * Align down here since the VM subsystem insists that the
 379                  * memmap entries are valid from the bank start aligned to
 380                  * MAX_ORDER_NR_PAGES.
 381                  */
 382                 start = round_down(start, MAX_ORDER_NR_PAGES);
 383 #endif
 384                 /*
 385                  * If we had a previous bank, and there is a space
 386                  * between the current bank and the previous, free it.
 387                  */
 388                 if (prev_end && prev_end < start)
 389                         free_memmap(prev_end, start);
 390
 391                 /*
 392                  * Align up here since the VM subsystem insists that the
 393                  * memmap entries are valid from the bank end aligned to
 394                  * MAX_ORDER_NR_PAGES.
 395                  */
 396                 prev_end = ALIGN(memblock_region_memory_end_pfn(reg),
 397                                  MAX_ORDER_NR_PAGES);
 398         }
 399
 400 #ifdef CONFIG_SPARSEMEM
 401         if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
 402                 free_memmap(prev_end,
 403                             ALIGN(prev_end, PAGES_PER_SECTION));
 404 #endif
 405 }
 406
 407 #ifdef CONFIG_HIGHMEM
 408 static inline void free_area_high(unsigned long pfn, unsigned long end)
 409 {
 410         for (; pfn < end; pfn++)
 411                 free_highmem_page(pfn_to_page(pfn));
 412 }
 413 #endif
 414
 415 static void __init free_highpages(void)
 416 {
 417 #ifdef CONFIG_HIGHMEM
 418         unsigned long max_low = max_low_pfn;
 419         struct memblock_region *mem, *res;
 420
 421         /* set highmem page free */
 422         for_each_memblock(memory, mem) {
 423                 unsigned long start = memblock_region_memory_base_pfn(mem);
 424                 unsigned long end = memblock_region_memory_end_pfn(mem);
 425
 426                 /* Ignore complete lowmem entries */
 427                 if (end <= max_low)
 428                         continue;
 429
 430                 if (memblock_is_nomap(mem))
 431                         continue;
 432
 433                 /* Truncate partial highmem entries */
 434                 if (start < max_low)
 435                         start = max_low;
 436
 437                 /* Find and exclude any reserved regions */
 438                 for_each_memblock(reserved, res) {
 439                         unsigned long res_start, res_end;
 440
 441                         res_start = memblock_region_reserved_base_pfn(res);
 442                         res_end = memblock_region_reserved_end_pfn(res);
 443
 444                         if (res_end < start)
 445                                 continue;
 446                         if (res_start < start)
 447                                 res_start = start;
 448                         if (res_start > end)
 449                                 res_start = end;
 450                         if (res_end > end)
 451                                 res_end = end;
 452                         if (res_start != start)
 453                                 free_area_high(start, res_start);
 454                         start = res_end;
 455                         if (start == end)
 456                                 break;
 457                 }
 458
 459                 /* And now free anything which remains */
 460                 if (start < end)
 461                         free_area_high(start, end);
 462         }
 463 #endif
 464 }
 465
 466 /*
 467  * mem_init() marks the free areas in the mem_map and tells us how much
 468  * memory is free.  This is done after various parts of the system have
 469  * claimed their memory after the kernel image.
 470  */
 471 void __init mem_init(void)
 472 {
 473 #ifdef CONFIG_ARM_LPAE
 474         swiotlb_init(1);
 475 #endif
 476
 477         set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
 478
 479         /* this will put all unused low memory onto the freelists */
 480         free_unused_memmap();
 481         memblock_free_all();
 482
 483 #ifdef CONFIG_SA1111
 484         /* now that our DMA memory is actually so designated, we can free it */
 485         free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
 486 #endif
 487
 488         free_highpages();
 489
 490         mem_init_print_info(NULL);
 491
 492         /*
 493          * Check boundaries twice: Some fundamental inconsistencies can
 494          * be detected at build time already.
 495          */
 496 #ifdef CONFIG_MMU
 497         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 498         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 499 #endif
 500
 501 #ifdef CONFIG_HIGHMEM
 502         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 503         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 504 #endif
 505 }
 506
 507 #ifdef CONFIG_STRICT_KERNEL_RWX
 508 struct section_perm {
 509         const char *name;
 510         unsigned long start;
 511         unsigned long end;
 512         pmdval_t mask;
 513         pmdval_t prot;
 514         pmdval_t clear;
 515 };
 516
 517 /* First section-aligned location at or after __start_rodata. */
 518 extern char __start_rodata_section_aligned[];
 519
 520 static struct section_perm nx_perms[] = {
 521         /* Make pages tables, etc before _stext RW (set NX). */
 522         {
 523                 .name   = "pre-text NX",
 524                 .start  = PAGE_OFFSET,
 525                 .end    = (unsigned long)_stext,
 526                 .mask   = ~PMD_SECT_XN,
 527                 .prot   = PMD_SECT_XN,
 528         },
 529         /* Make init RW (set NX). */
 530         {
 531                 .name   = "init NX",
 532                 .start  = (unsigned long)__init_begin,
 533                 .end    = (unsigned long)_sdata,
 534                 .mask   = ~PMD_SECT_XN,
 535                 .prot   = PMD_SECT_XN,
 536         },
 537         /* Make rodata NX (set RO in ro_perms below). */
 538         {
 539                 .name   = "rodata NX",
 540                 .start  = (unsigned long)__start_rodata_section_aligned,
 541                 .end    = (unsigned long)__init_begin,
 542                 .mask   = ~PMD_SECT_XN,
 543                 .prot   = PMD_SECT_XN,
 544         },
 545 };
 546
 547 static struct section_perm ro_perms[] = {
 548         /* Make kernel code and rodata RX (set RO). */
 549         {
 550                 .name   = "text/rodata RO",
 551                 .start  = (unsigned long)_stext,
 552                 .end    = (unsigned long)__init_begin,
 553 #ifdef CONFIG_ARM_LPAE
 554                 .mask   = ~(L_PMD_SECT_RDONLY | PMD_SECT_AP2),
 555                 .prot   = L_PMD_SECT_RDONLY | PMD_SECT_AP2,
 556 #else
 557                 .mask   = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE),
 558                 .prot   = PMD_SECT_APX | PMD_SECT_AP_WRITE,
 559                 .clear  = PMD_SECT_AP_WRITE,
 560 #endif
 561         },
 562 };
 563
 564 /*
 565  * Updates section permissions only for the current mm (sections are
 566  * copied into each mm). During startup, this is the init_mm. Is only
 567  * safe to be called with preemption disabled, as under stop_machine().
 568  */
 569 static inline void section_update(unsigned long addr, pmdval_t mask,
 570                                   pmdval_t prot, struct mm_struct *mm)
 571 {
 572         pmd_t *pmd;
 573
 574         pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr);
 575
 576 #ifdef CONFIG_ARM_LPAE
 577         pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
 578 #else
 579         if (addr & SECTION_SIZE)
 580                 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot);
 581         else
 582                 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
 583 #endif
 584         flush_pmd_entry(pmd);
 585         local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE);
 586 }
 587
 588 /* Make sure extended page tables are in use. */
 589 static inline bool arch_has_strict_perms(void)
 590 {
 591         if (cpu_architecture() < CPU_ARCH_ARMv6)
 592                 return false;
 593
 594         return !!(get_cr() & CR_XP);
 595 }
 596
 597 static void set_section_perms(struct section_perm *perms, int n, bool set,
 598                               struct mm_struct *mm)
 599 {
 600         size_t i;
 601         unsigned long addr;
 602
 603         if (!arch_has_strict_perms())
 604                 return;
 605
 606         for (i = 0; i < n; i++) {
 607                 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) ||
 608                     !IS_ALIGNED(perms[i].end, SECTION_SIZE)) {
 609                         pr_err("BUG: %s section %lx-%lx not aligned to %lx\n",
 610                                 perms[i].name, perms[i].start, perms[i].end,
 611                                 SECTION_SIZE);
 612                         continue;
 613                 }
 614
 615                 for (addr = perms[i].start;
 616                      addr < perms[i].end;
 617                      addr += SECTION_SIZE)
 618                         section_update(addr, perms[i].mask,
 619                                 set ? perms[i].prot : perms[i].clear, mm);
 620         }
 621
 622 }
 623
 624 /**
 625  * update_sections_early intended to be called only through stop_machine
 626  * framework and executed by only one CPU while all other CPUs will spin and
 627  * wait, so no locking is required in this function.
 628  */
 629 static void update_sections_early(struct section_perm perms[], int n)
 630 {
 631         struct task_struct *t, *s;
 632
 633         for_each_process(t) {
 634                 if (t->flags & PF_KTHREAD)
 635                         continue;
 636                 for_each_thread(t, s)
 637                         if (s->mm)
 638                                 set_section_perms(perms, n, true, s->mm);
 639         }
 640         set_section_perms(perms, n, true, current->active_mm);
 641         set_section_perms(perms, n, true, &init_mm);
 642 }
 643
 644 static int __fix_kernmem_perms(void *unused)
 645 {
 646         update_sections_early(nx_perms, ARRAY_SIZE(nx_perms));
 647         return 0;
 648 }
 649
 650 static void fix_kernmem_perms(void)
 651 {
 652         stop_machine(__fix_kernmem_perms, NULL, NULL);
 653 }
 654
 655 static int __mark_rodata_ro(void *unused)
 656 {
 657         update_sections_early(ro_perms, ARRAY_SIZE(ro_perms));
 658         return 0;
 659 }
 660
 661 static int kernel_set_to_readonly __read_mostly;
 662
 663 void mark_rodata_ro(void)
 664 {
 665         kernel_set_to_readonly = 1;
 666         stop_machine(__mark_rodata_ro, NULL, NULL);
 667         debug_checkwx();
 668 }
 669
 670 void set_kernel_text_rw(void)
 671 {
 672         if (!kernel_set_to_readonly)
 673                 return;
 674
 675         set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false,
 676                                 current->active_mm);
 677 }
 678
 679 void set_kernel_text_ro(void)
 680 {
 681         if (!kernel_set_to_readonly)
 682                 return;
 683
 684         set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true,
 685                                 current->active_mm);
 686 }
 687
 688 #else
 689 static inline void fix_kernmem_perms(void) { }
 690 #endif /* CONFIG_STRICT_KERNEL_RWX */
 691
 692 void free_initmem(void)
 693 {
 694         fix_kernmem_perms();
 695
 696         poison_init_mem(__init_begin, __init_end - __init_begin);
 697         if (!machine_is_integrator() && !machine_is_cintegrator())
 698                 free_initmem_default(-1);
 699 }
 700
 701 #ifdef CONFIG_BLK_DEV_INITRD
 702 void free_initrd_mem(unsigned long start, unsigned long end)
 703 {
 704         if (start == initrd_start)
 705                 start = round_down(start, PAGE_SIZE);
 706         if (end == initrd_end)
 707                 end = round_up(end, PAGE_SIZE);
 708
 709         poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 710         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 711 }
 712 #endif