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 #include <linux/stop_machine.h> 26 27 #include <asm/cp15.h> 28 #include <asm/mach-types.h> 29 #include <asm/memblock.h> 30 #include <asm/memory.h> 31 #include <asm/prom.h> 32 #include <asm/sections.h> 33 #include <asm/setup.h> 34 #include <asm/system_info.h> 35 #include <asm/tlb.h> 36 #include <asm/fixmap.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 static phys_addr_t phys_initrd_start __initdata = 0; 52 static unsigned long phys_initrd_size __initdata = 0; 53 54 static int __init early_initrd(char *p) 55 { 56 phys_addr_t start; 57 unsigned long size; 58 char *endp; 59 60 start = memparse(p, &endp); 61 if (*endp == ',') { 62 size = memparse(endp + 1, NULL); 63 64 phys_initrd_start = start; 65 phys_initrd_size = size; 66 } 67 return 0; 68 } 69 early_param("initrd", early_initrd); 70 71 static int __init parse_tag_initrd(const struct tag *tag) 72 { 73 pr_warn("ATAG_INITRD is deprecated; " 74 "please update your bootloader.\n"); 75 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 76 phys_initrd_size = tag->u.initrd.size; 77 return 0; 78 } 79 80 __tagtable(ATAG_INITRD, parse_tag_initrd); 81 82 static int __init parse_tag_initrd2(const struct tag *tag) 83 { 84 phys_initrd_start = tag->u.initrd.start; 85 phys_initrd_size = tag->u.initrd.size; 86 return 0; 87 } 88 89 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 90 91 static void __init find_limits(unsigned long *min, unsigned long *max_low, 92 unsigned long *max_high) 93 { 94 *max_low = PFN_DOWN(memblock_get_current_limit()); 95 *min = PFN_UP(memblock_start_of_DRAM()); 96 *max_high = PFN_DOWN(memblock_end_of_DRAM()); 97 } 98 99 #ifdef CONFIG_ZONE_DMA 100 101 phys_addr_t arm_dma_zone_size __read_mostly; 102 EXPORT_SYMBOL(arm_dma_zone_size); 103 104 /* 105 * The DMA mask corresponding to the maximum bus address allocatable 106 * using GFP_DMA. The default here places no restriction on DMA 107 * allocations. This must be the smallest DMA mask in the system, 108 * so a successful GFP_DMA allocation will always satisfy this. 109 */ 110 phys_addr_t arm_dma_limit; 111 unsigned long arm_dma_pfn_limit; 112 113 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 114 unsigned long dma_size) 115 { 116 if (size[0] <= dma_size) 117 return; 118 119 size[ZONE_NORMAL] = size[0] - dma_size; 120 size[ZONE_DMA] = dma_size; 121 hole[ZONE_NORMAL] = hole[0]; 122 hole[ZONE_DMA] = 0; 123 } 124 #endif 125 126 void __init setup_dma_zone(const struct machine_desc *mdesc) 127 { 128 #ifdef CONFIG_ZONE_DMA 129 if (mdesc->dma_zone_size) { 130 arm_dma_zone_size = mdesc->dma_zone_size; 131 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 132 } else 133 arm_dma_limit = 0xffffffff; 134 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 135 #endif 136 } 137 138 static void __init zone_sizes_init(unsigned long min, unsigned long max_low, 139 unsigned long max_high) 140 { 141 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 142 struct memblock_region *reg; 143 144 /* 145 * initialise the zones. 146 */ 147 memset(zone_size, 0, sizeof(zone_size)); 148 149 /* 150 * The memory size has already been determined. If we need 151 * to do anything fancy with the allocation of this memory 152 * to the zones, now is the time to do it. 153 */ 154 zone_size[0] = max_low - min; 155 #ifdef CONFIG_HIGHMEM 156 zone_size[ZONE_HIGHMEM] = max_high - max_low; 157 #endif 158 159 /* 160 * Calculate the size of the holes. 161 * holes = node_size - sum(bank_sizes) 162 */ 163 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 164 for_each_memblock(memory, reg) { 165 unsigned long start = memblock_region_memory_base_pfn(reg); 166 unsigned long end = memblock_region_memory_end_pfn(reg); 167 168 if (start < max_low) { 169 unsigned long low_end = min(end, max_low); 170 zhole_size[0] -= low_end - start; 171 } 172 #ifdef CONFIG_HIGHMEM 173 if (end > max_low) { 174 unsigned long high_start = max(start, max_low); 175 zhole_size[ZONE_HIGHMEM] -= end - high_start; 176 } 177 #endif 178 } 179 180 #ifdef CONFIG_ZONE_DMA 181 /* 182 * Adjust the sizes according to any special requirements for 183 * this machine type. 184 */ 185 if (arm_dma_zone_size) 186 arm_adjust_dma_zone(zone_size, zhole_size, 187 arm_dma_zone_size >> PAGE_SHIFT); 188 #endif 189 190 free_area_init_node(0, zone_size, min, zhole_size); 191 } 192 193 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 194 int pfn_valid(unsigned long pfn) 195 { 196 return memblock_is_map_memory(__pfn_to_phys(pfn)); 197 } 198 EXPORT_SYMBOL(pfn_valid); 199 #endif 200 201 #ifndef CONFIG_SPARSEMEM 202 static void __init arm_memory_present(void) 203 { 204 } 205 #else 206 static void __init arm_memory_present(void) 207 { 208 struct memblock_region *reg; 209 210 for_each_memblock(memory, reg) 211 memory_present(0, memblock_region_memory_base_pfn(reg), 212 memblock_region_memory_end_pfn(reg)); 213 } 214 #endif 215 216 static bool arm_memblock_steal_permitted = true; 217 218 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 219 { 220 phys_addr_t phys; 221 222 BUG_ON(!arm_memblock_steal_permitted); 223 224 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 225 memblock_free(phys, size); 226 memblock_remove(phys, size); 227 228 return phys; 229 } 230 231 static void __init arm_initrd_init(void) 232 { 233 #ifdef CONFIG_BLK_DEV_INITRD 234 /* FDT scan will populate initrd_start */ 235 if (initrd_start && !phys_initrd_size) { 236 phys_initrd_start = __virt_to_phys(initrd_start); 237 phys_initrd_size = initrd_end - initrd_start; 238 } 239 240 initrd_start = initrd_end = 0; 241 242 if (!phys_initrd_size) 243 return; 244 245 if (!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 return; 249 } 250 251 if (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 return; 255 } 256 257 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 #endif 263 } 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 unsigned long min, max_low, max_high; 291 292 memblock_allow_resize(); 293 max_low = max_high = 0; 294 295 find_limits(&min, &max_low, &max_high); 296 297 early_memtest((phys_addr_t)min << PAGE_SHIFT, 298 (phys_addr_t)max_low << PAGE_SHIFT); 299 300 /* 301 * Sparsemem tries to allocate bootmem in memory_present(), 302 * so must be done after the fixed reservations 303 */ 304 arm_memory_present(); 305 306 /* 307 * sparse_init() needs the bootmem allocator up and running. 308 */ 309 sparse_init(); 310 311 /* 312 * Now free the memory - free_area_init_node needs 313 * the sparse mem_map arrays initialized by sparse_init() 314 * for memmap_init_zone(), otherwise all PFNs are invalid. 315 */ 316 zone_sizes_init(min, max_low, max_high); 317 318 /* 319 * This doesn't seem to be used by the Linux memory manager any 320 * more, but is used by ll_rw_block. If we can get rid of it, we 321 * also get rid of some of the stuff above as well. 322 */ 323 min_low_pfn = min; 324 max_low_pfn = max_low; 325 max_pfn = max_high; 326 } 327 328 /* 329 * Poison init memory with an undefined instruction (ARM) or a branch to an 330 * undefined instruction (Thumb). 331 */ 332 static inline void poison_init_mem(void *s, size_t count) 333 { 334 u32 *p = (u32 *)s; 335 for (; count != 0; count -= 4) 336 *p++ = 0xe7fddef0; 337 } 338 339 static inline void 340 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 341 { 342 struct page *start_pg, *end_pg; 343 phys_addr_t pg, pgend; 344 345 /* 346 * Convert start_pfn/end_pfn to a struct page pointer. 347 */ 348 start_pg = pfn_to_page(start_pfn - 1) + 1; 349 end_pg = pfn_to_page(end_pfn - 1) + 1; 350 351 /* 352 * Convert to physical addresses, and 353 * round start upwards and end downwards. 354 */ 355 pg = PAGE_ALIGN(__pa(start_pg)); 356 pgend = __pa(end_pg) & PAGE_MASK; 357 358 /* 359 * If there are free pages between these, 360 * free the section of the memmap array. 361 */ 362 if (pg < pgend) 363 memblock_free_early(pg, pgend - pg); 364 } 365 366 /* 367 * The mem_map array can get very big. Free the unused area of the memory map. 368 */ 369 static void __init free_unused_memmap(void) 370 { 371 unsigned long start, prev_end = 0; 372 struct memblock_region *reg; 373 374 /* 375 * This relies on each bank being in address order. 376 * The banks are sorted previously in bootmem_init(). 377 */ 378 for_each_memblock(memory, reg) { 379 start = memblock_region_memory_base_pfn(reg); 380 381 #ifdef CONFIG_SPARSEMEM 382 /* 383 * Take care not to free memmap entries that don't exist 384 * due to SPARSEMEM sections which aren't present. 385 */ 386 start = min(start, 387 ALIGN(prev_end, PAGES_PER_SECTION)); 388 #else 389 /* 390 * Align down here since the VM subsystem insists that the 391 * memmap entries are valid from the bank start aligned to 392 * MAX_ORDER_NR_PAGES. 393 */ 394 start = round_down(start, MAX_ORDER_NR_PAGES); 395 #endif 396 /* 397 * If we had a previous bank, and there is a space 398 * between the current bank and the previous, free it. 399 */ 400 if (prev_end && prev_end < start) 401 free_memmap(prev_end, start); 402 403 /* 404 * Align up here since the VM subsystem insists that the 405 * memmap entries are valid from the bank end aligned to 406 * MAX_ORDER_NR_PAGES. 407 */ 408 prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 409 MAX_ORDER_NR_PAGES); 410 } 411 412 #ifdef CONFIG_SPARSEMEM 413 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 414 free_memmap(prev_end, 415 ALIGN(prev_end, PAGES_PER_SECTION)); 416 #endif 417 } 418 419 #ifdef CONFIG_HIGHMEM 420 static inline void free_area_high(unsigned long pfn, unsigned long end) 421 { 422 for (; pfn < end; pfn++) 423 free_highmem_page(pfn_to_page(pfn)); 424 } 425 #endif 426 427 static void __init free_highpages(void) 428 { 429 #ifdef CONFIG_HIGHMEM 430 unsigned long max_low = max_low_pfn; 431 struct memblock_region *mem, *res; 432 433 /* set highmem page free */ 434 for_each_memblock(memory, mem) { 435 unsigned long start = memblock_region_memory_base_pfn(mem); 436 unsigned long end = memblock_region_memory_end_pfn(mem); 437 438 /* Ignore complete lowmem entries */ 439 if (end <= max_low) 440 continue; 441 442 if (memblock_is_nomap(mem)) 443 continue; 444 445 /* Truncate partial highmem entries */ 446 if (start < max_low) 447 start = max_low; 448 449 /* Find and exclude any reserved regions */ 450 for_each_memblock(reserved, res) { 451 unsigned long res_start, res_end; 452 453 res_start = memblock_region_reserved_base_pfn(res); 454 res_end = memblock_region_reserved_end_pfn(res); 455 456 if (res_end < start) 457 continue; 458 if (res_start < start) 459 res_start = start; 460 if (res_start > end) 461 res_start = end; 462 if (res_end > end) 463 res_end = end; 464 if (res_start != start) 465 free_area_high(start, res_start); 466 start = res_end; 467 if (start == end) 468 break; 469 } 470 471 /* And now free anything which remains */ 472 if (start < end) 473 free_area_high(start, end); 474 } 475 #endif 476 } 477 478 /* 479 * mem_init() marks the free areas in the mem_map and tells us how much 480 * memory is free. This is done after various parts of the system have 481 * claimed their memory after the kernel image. 482 */ 483 void __init mem_init(void) 484 { 485 #ifdef CONFIG_HAVE_TCM 486 /* These pointers are filled in on TCM detection */ 487 extern u32 dtcm_end; 488 extern u32 itcm_end; 489 #endif 490 491 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 492 493 /* this will put all unused low memory onto the freelists */ 494 free_unused_memmap(); 495 free_all_bootmem(); 496 497 #ifdef CONFIG_SA1111 498 /* now that our DMA memory is actually so designated, we can free it */ 499 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 500 #endif 501 502 free_highpages(); 503 504 mem_init_print_info(NULL); 505 506 #define MLK(b, t) b, t, ((t) - (b)) >> 10 507 #define MLM(b, t) b, t, ((t) - (b)) >> 20 508 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 509 510 pr_notice("Virtual kernel memory layout:\n" 511 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 512 #ifdef CONFIG_HAVE_TCM 513 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 514 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 515 #endif 516 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 517 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 518 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 519 #ifdef CONFIG_HIGHMEM 520 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 521 #endif 522 #ifdef CONFIG_MODULES 523 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 524 #endif 525 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 526 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 527 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 528 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 529 530 MLK(VECTORS_BASE, VECTORS_BASE + PAGE_SIZE), 531 #ifdef CONFIG_HAVE_TCM 532 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 533 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 534 #endif 535 MLK(FIXADDR_START, FIXADDR_END), 536 MLM(VMALLOC_START, VMALLOC_END), 537 MLM(PAGE_OFFSET, (unsigned long)high_memory), 538 #ifdef CONFIG_HIGHMEM 539 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 540 (PAGE_SIZE)), 541 #endif 542 #ifdef CONFIG_MODULES 543 MLM(MODULES_VADDR, MODULES_END), 544 #endif 545 546 MLK_ROUNDUP(_text, _etext), 547 MLK_ROUNDUP(__init_begin, __init_end), 548 MLK_ROUNDUP(_sdata, _edata), 549 MLK_ROUNDUP(__bss_start, __bss_stop)); 550 551 #undef MLK 552 #undef MLM 553 #undef MLK_ROUNDUP 554 555 /* 556 * Check boundaries twice: Some fundamental inconsistencies can 557 * be detected at build time already. 558 */ 559 #ifdef CONFIG_MMU 560 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 561 BUG_ON(TASK_SIZE > MODULES_VADDR); 562 #endif 563 564 #ifdef CONFIG_HIGHMEM 565 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 566 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 567 #endif 568 569 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 570 extern int sysctl_overcommit_memory; 571 /* 572 * On a machine this small we won't get 573 * anywhere without overcommit, so turn 574 * it on by default. 575 */ 576 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 577 } 578 } 579 580 #ifdef CONFIG_DEBUG_RODATA 581 struct section_perm { 582 const char *name; 583 unsigned long start; 584 unsigned long end; 585 pmdval_t mask; 586 pmdval_t prot; 587 pmdval_t clear; 588 }; 589 590 /* First section-aligned location at or after __start_rodata. */ 591 extern char __start_rodata_section_aligned[]; 592 593 static struct section_perm nx_perms[] = { 594 /* Make pages tables, etc before _stext RW (set NX). */ 595 { 596 .name = "pre-text NX", 597 .start = PAGE_OFFSET, 598 .end = (unsigned long)_stext, 599 .mask = ~PMD_SECT_XN, 600 .prot = PMD_SECT_XN, 601 }, 602 /* Make init RW (set NX). */ 603 { 604 .name = "init NX", 605 .start = (unsigned long)__init_begin, 606 .end = (unsigned long)_sdata, 607 .mask = ~PMD_SECT_XN, 608 .prot = PMD_SECT_XN, 609 }, 610 /* Make rodata NX (set RO in ro_perms below). */ 611 { 612 .name = "rodata NX", 613 .start = (unsigned long)__start_rodata_section_aligned, 614 .end = (unsigned long)__init_begin, 615 .mask = ~PMD_SECT_XN, 616 .prot = PMD_SECT_XN, 617 }, 618 }; 619 620 static struct section_perm ro_perms[] = { 621 /* Make kernel code and rodata RX (set RO). */ 622 { 623 .name = "text/rodata RO", 624 .start = (unsigned long)_stext, 625 .end = (unsigned long)__init_begin, 626 #ifdef CONFIG_ARM_LPAE 627 .mask = ~L_PMD_SECT_RDONLY, 628 .prot = L_PMD_SECT_RDONLY, 629 #else 630 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 631 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 632 .clear = PMD_SECT_AP_WRITE, 633 #endif 634 }, 635 }; 636 637 /* 638 * Updates section permissions only for the current mm (sections are 639 * copied into each mm). During startup, this is the init_mm. Is only 640 * safe to be called with preemption disabled, as under stop_machine(). 641 */ 642 static inline void section_update(unsigned long addr, pmdval_t mask, 643 pmdval_t prot, struct mm_struct *mm) 644 { 645 pmd_t *pmd; 646 647 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 648 649 #ifdef CONFIG_ARM_LPAE 650 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 651 #else 652 if (addr & SECTION_SIZE) 653 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 654 else 655 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 656 #endif 657 flush_pmd_entry(pmd); 658 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 659 } 660 661 /* Make sure extended page tables are in use. */ 662 static inline bool arch_has_strict_perms(void) 663 { 664 if (cpu_architecture() < CPU_ARCH_ARMv6) 665 return false; 666 667 return !!(get_cr() & CR_XP); 668 } 669 670 void set_section_perms(struct section_perm *perms, int n, bool set, 671 struct mm_struct *mm) 672 { 673 size_t i; 674 unsigned long addr; 675 676 if (!arch_has_strict_perms()) 677 return; 678 679 for (i = 0; i < n; i++) { 680 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || 681 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { 682 pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", 683 perms[i].name, perms[i].start, perms[i].end, 684 SECTION_SIZE); 685 continue; 686 } 687 688 for (addr = perms[i].start; 689 addr < perms[i].end; 690 addr += SECTION_SIZE) 691 section_update(addr, perms[i].mask, 692 set ? perms[i].prot : perms[i].clear, mm); 693 } 694 695 } 696 697 static void update_sections_early(struct section_perm perms[], int n) 698 { 699 struct task_struct *t, *s; 700 701 read_lock(&tasklist_lock); 702 for_each_process(t) { 703 if (t->flags & PF_KTHREAD) 704 continue; 705 for_each_thread(t, s) 706 set_section_perms(perms, n, true, s->mm); 707 } 708 read_unlock(&tasklist_lock); 709 set_section_perms(perms, n, true, current->active_mm); 710 set_section_perms(perms, n, true, &init_mm); 711 } 712 713 int __fix_kernmem_perms(void *unused) 714 { 715 update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); 716 return 0; 717 } 718 719 void fix_kernmem_perms(void) 720 { 721 stop_machine(__fix_kernmem_perms, NULL, NULL); 722 } 723 724 int __mark_rodata_ro(void *unused) 725 { 726 update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); 727 return 0; 728 } 729 730 void mark_rodata_ro(void) 731 { 732 stop_machine(__mark_rodata_ro, NULL, NULL); 733 } 734 735 void set_kernel_text_rw(void) 736 { 737 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, 738 current->active_mm); 739 } 740 741 void set_kernel_text_ro(void) 742 { 743 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, 744 current->active_mm); 745 } 746 747 #else 748 static inline void fix_kernmem_perms(void) { } 749 #endif /* CONFIG_DEBUG_RODATA */ 750 751 void free_tcmmem(void) 752 { 753 #ifdef CONFIG_HAVE_TCM 754 extern char __tcm_start, __tcm_end; 755 756 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 757 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 758 #endif 759 } 760 761 void free_initmem(void) 762 { 763 fix_kernmem_perms(); 764 free_tcmmem(); 765 766 poison_init_mem(__init_begin, __init_end - __init_begin); 767 if (!machine_is_integrator() && !machine_is_cintegrator()) 768 free_initmem_default(-1); 769 } 770 771 #ifdef CONFIG_BLK_DEV_INITRD 772 773 static int keep_initrd; 774 775 void free_initrd_mem(unsigned long start, unsigned long end) 776 { 777 if (!keep_initrd) { 778 if (start == initrd_start) 779 start = round_down(start, PAGE_SIZE); 780 if (end == initrd_end) 781 end = round_up(end, PAGE_SIZE); 782 783 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 784 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 785 } 786 } 787 788 static int __init keepinitrd_setup(char *__unused) 789 { 790 keep_initrd = 1; 791 return 1; 792 } 793 794 __setup("keepinitrd", keepinitrd_setup); 795 #endif 796