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/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 37 #include <asm/mach/arch.h> 38 #include <asm/mach/map.h> 39 40 #include "mm.h" 41 42 #ifdef CONFIG_CPU_CP15_MMU 43 unsigned long __init __clear_cr(unsigned long mask) 44 { 45 cr_alignment = cr_alignment & ~mask; 46 return cr_alignment; 47 } 48 #endif 49 50 static phys_addr_t phys_initrd_start __initdata = 0; 51 static unsigned long phys_initrd_size __initdata = 0; 52 53 static int __init early_initrd(char *p) 54 { 55 phys_addr_t start; 56 unsigned long size; 57 char *endp; 58 59 start = memparse(p, &endp); 60 if (*endp == ',') { 61 size = memparse(endp + 1, NULL); 62 63 phys_initrd_start = start; 64 phys_initrd_size = size; 65 } 66 return 0; 67 } 68 early_param("initrd", early_initrd); 69 70 static int __init parse_tag_initrd(const struct tag *tag) 71 { 72 pr_warn("ATAG_INITRD is deprecated; " 73 "please update your bootloader.\n"); 74 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 75 phys_initrd_size = tag->u.initrd.size; 76 return 0; 77 } 78 79 __tagtable(ATAG_INITRD, parse_tag_initrd); 80 81 static int __init parse_tag_initrd2(const struct tag *tag) 82 { 83 phys_initrd_start = tag->u.initrd.start; 84 phys_initrd_size = tag->u.initrd.size; 85 return 0; 86 } 87 88 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 89 90 static void __init find_limits(unsigned long *min, unsigned long *max_low, 91 unsigned long *max_high) 92 { 93 *max_low = PFN_DOWN(memblock_get_current_limit()); 94 *min = PFN_UP(memblock_start_of_DRAM()); 95 *max_high = PFN_DOWN(memblock_end_of_DRAM()); 96 } 97 98 #ifdef CONFIG_ZONE_DMA 99 100 phys_addr_t arm_dma_zone_size __read_mostly; 101 EXPORT_SYMBOL(arm_dma_zone_size); 102 103 /* 104 * The DMA mask corresponding to the maximum bus address allocatable 105 * using GFP_DMA. The default here places no restriction on DMA 106 * allocations. This must be the smallest DMA mask in the system, 107 * so a successful GFP_DMA allocation will always satisfy this. 108 */ 109 phys_addr_t arm_dma_limit; 110 unsigned long arm_dma_pfn_limit; 111 112 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 113 unsigned long dma_size) 114 { 115 if (size[0] <= dma_size) 116 return; 117 118 size[ZONE_NORMAL] = size[0] - dma_size; 119 size[ZONE_DMA] = dma_size; 120 hole[ZONE_NORMAL] = hole[0]; 121 hole[ZONE_DMA] = 0; 122 } 123 #endif 124 125 void __init setup_dma_zone(const struct machine_desc *mdesc) 126 { 127 #ifdef CONFIG_ZONE_DMA 128 if (mdesc->dma_zone_size) { 129 arm_dma_zone_size = mdesc->dma_zone_size; 130 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 131 } else 132 arm_dma_limit = 0xffffffff; 133 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 134 #endif 135 } 136 137 static void __init zone_sizes_init(unsigned long min, unsigned long max_low, 138 unsigned long max_high) 139 { 140 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 141 struct memblock_region *reg; 142 143 /* 144 * initialise the zones. 145 */ 146 memset(zone_size, 0, sizeof(zone_size)); 147 148 /* 149 * The memory size has already been determined. If we need 150 * to do anything fancy with the allocation of this memory 151 * to the zones, now is the time to do it. 152 */ 153 zone_size[0] = max_low - min; 154 #ifdef CONFIG_HIGHMEM 155 zone_size[ZONE_HIGHMEM] = max_high - max_low; 156 #endif 157 158 /* 159 * Calculate the size of the holes. 160 * holes = node_size - sum(bank_sizes) 161 */ 162 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 163 for_each_memblock(memory, reg) { 164 unsigned long start = memblock_region_memory_base_pfn(reg); 165 unsigned long end = memblock_region_memory_end_pfn(reg); 166 167 if (start < max_low) { 168 unsigned long low_end = min(end, max_low); 169 zhole_size[0] -= low_end - start; 170 } 171 #ifdef CONFIG_HIGHMEM 172 if (end > max_low) { 173 unsigned long high_start = max(start, max_low); 174 zhole_size[ZONE_HIGHMEM] -= end - high_start; 175 } 176 #endif 177 } 178 179 #ifdef CONFIG_ZONE_DMA 180 /* 181 * Adjust the sizes according to any special requirements for 182 * this machine type. 183 */ 184 if (arm_dma_zone_size) 185 arm_adjust_dma_zone(zone_size, zhole_size, 186 arm_dma_zone_size >> PAGE_SHIFT); 187 #endif 188 189 free_area_init_node(0, zone_size, min, zhole_size); 190 } 191 192 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 193 int pfn_valid(unsigned long pfn) 194 { 195 return memblock_is_map_memory(__pfn_to_phys(pfn)); 196 } 197 EXPORT_SYMBOL(pfn_valid); 198 #endif 199 200 #ifndef CONFIG_SPARSEMEM 201 static void __init arm_memory_present(void) 202 { 203 } 204 #else 205 static void __init arm_memory_present(void) 206 { 207 struct memblock_region *reg; 208 209 for_each_memblock(memory, reg) 210 memory_present(0, memblock_region_memory_base_pfn(reg), 211 memblock_region_memory_end_pfn(reg)); 212 } 213 #endif 214 215 static bool arm_memblock_steal_permitted = true; 216 217 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 218 { 219 phys_addr_t phys; 220 221 BUG_ON(!arm_memblock_steal_permitted); 222 223 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 224 memblock_free(phys, size); 225 memblock_remove(phys, size); 226 227 return phys; 228 } 229 230 void __init arm_memblock_init(const struct machine_desc *mdesc) 231 { 232 /* Register the kernel text, kernel data and initrd with memblock. */ 233 #ifdef CONFIG_XIP_KERNEL 234 memblock_reserve(__pa(_sdata), _end - _sdata); 235 #else 236 memblock_reserve(__pa(_stext), _end - _stext); 237 #endif 238 #ifdef CONFIG_BLK_DEV_INITRD 239 /* FDT scan will populate initrd_start */ 240 if (initrd_start && !phys_initrd_size) { 241 phys_initrd_start = __virt_to_phys(initrd_start); 242 phys_initrd_size = initrd_end - initrd_start; 243 } 244 initrd_start = initrd_end = 0; 245 if (phys_initrd_size && 246 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 247 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 248 (u64)phys_initrd_start, phys_initrd_size); 249 phys_initrd_start = phys_initrd_size = 0; 250 } 251 if (phys_initrd_size && 252 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 253 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 254 (u64)phys_initrd_start, phys_initrd_size); 255 phys_initrd_start = phys_initrd_size = 0; 256 } 257 if (phys_initrd_size) { 258 memblock_reserve(phys_initrd_start, phys_initrd_size); 259 260 /* Now convert initrd to virtual addresses */ 261 initrd_start = __phys_to_virt(phys_initrd_start); 262 initrd_end = initrd_start + phys_initrd_size; 263 } 264 #endif 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 unsigned long min, max_low, max_high; 285 286 memblock_allow_resize(); 287 max_low = max_high = 0; 288 289 find_limits(&min, &max_low, &max_high); 290 291 early_memtest((phys_addr_t)min << PAGE_SHIFT, 292 (phys_addr_t)max_low << PAGE_SHIFT); 293 294 /* 295 * Sparsemem tries to allocate bootmem in memory_present(), 296 * so must be done after the fixed reservations 297 */ 298 arm_memory_present(); 299 300 /* 301 * sparse_init() needs the bootmem allocator up and running. 302 */ 303 sparse_init(); 304 305 /* 306 * Now free the memory - free_area_init_node needs 307 * the sparse mem_map arrays initialized by sparse_init() 308 * for memmap_init_zone(), otherwise all PFNs are invalid. 309 */ 310 zone_sizes_init(min, max_low, max_high); 311 312 /* 313 * This doesn't seem to be used by the Linux memory manager any 314 * more, but is used by ll_rw_block. If we can get rid of it, we 315 * also get rid of some of the stuff above as well. 316 */ 317 min_low_pfn = min; 318 max_low_pfn = max_low; 319 max_pfn = max_high; 320 } 321 322 /* 323 * Poison init memory with an undefined instruction (ARM) or a branch to an 324 * undefined instruction (Thumb). 325 */ 326 static inline void poison_init_mem(void *s, size_t count) 327 { 328 u32 *p = (u32 *)s; 329 for (; count != 0; count -= 4) 330 *p++ = 0xe7fddef0; 331 } 332 333 static inline void 334 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 335 { 336 struct page *start_pg, *end_pg; 337 phys_addr_t pg, pgend; 338 339 /* 340 * Convert start_pfn/end_pfn to a struct page pointer. 341 */ 342 start_pg = pfn_to_page(start_pfn - 1) + 1; 343 end_pg = pfn_to_page(end_pfn - 1) + 1; 344 345 /* 346 * Convert to physical addresses, and 347 * round start upwards and end downwards. 348 */ 349 pg = PAGE_ALIGN(__pa(start_pg)); 350 pgend = __pa(end_pg) & PAGE_MASK; 351 352 /* 353 * If there are free pages between these, 354 * free the section of the memmap array. 355 */ 356 if (pg < pgend) 357 memblock_free_early(pg, pgend - pg); 358 } 359 360 /* 361 * The mem_map array can get very big. Free the unused area of the memory map. 362 */ 363 static void __init free_unused_memmap(void) 364 { 365 unsigned long start, prev_end = 0; 366 struct memblock_region *reg; 367 368 /* 369 * This relies on each bank being in address order. 370 * The banks are sorted previously in bootmem_init(). 371 */ 372 for_each_memblock(memory, reg) { 373 start = memblock_region_memory_base_pfn(reg); 374 375 #ifdef CONFIG_SPARSEMEM 376 /* 377 * Take care not to free memmap entries that don't exist 378 * due to SPARSEMEM sections which aren't present. 379 */ 380 start = min(start, 381 ALIGN(prev_end, PAGES_PER_SECTION)); 382 #else 383 /* 384 * Align down here since the VM subsystem insists that the 385 * memmap entries are valid from the bank start aligned to 386 * MAX_ORDER_NR_PAGES. 387 */ 388 start = round_down(start, MAX_ORDER_NR_PAGES); 389 #endif 390 /* 391 * If we had a previous bank, and there is a space 392 * between the current bank and the previous, free it. 393 */ 394 if (prev_end && prev_end < start) 395 free_memmap(prev_end, start); 396 397 /* 398 * Align up here since the VM subsystem insists that the 399 * memmap entries are valid from the bank end aligned to 400 * MAX_ORDER_NR_PAGES. 401 */ 402 prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 403 MAX_ORDER_NR_PAGES); 404 } 405 406 #ifdef CONFIG_SPARSEMEM 407 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 408 free_memmap(prev_end, 409 ALIGN(prev_end, PAGES_PER_SECTION)); 410 #endif 411 } 412 413 #ifdef CONFIG_HIGHMEM 414 static inline void free_area_high(unsigned long pfn, unsigned long end) 415 { 416 for (; pfn < end; pfn++) 417 free_highmem_page(pfn_to_page(pfn)); 418 } 419 #endif 420 421 static void __init free_highpages(void) 422 { 423 #ifdef CONFIG_HIGHMEM 424 unsigned long max_low = max_low_pfn; 425 struct memblock_region *mem, *res; 426 427 /* set highmem page free */ 428 for_each_memblock(memory, mem) { 429 unsigned long start = memblock_region_memory_base_pfn(mem); 430 unsigned long end = memblock_region_memory_end_pfn(mem); 431 432 /* Ignore complete lowmem entries */ 433 if (end <= max_low) 434 continue; 435 436 if (memblock_is_nomap(mem)) 437 continue; 438 439 /* Truncate partial highmem entries */ 440 if (start < max_low) 441 start = max_low; 442 443 /* Find and exclude any reserved regions */ 444 for_each_memblock(reserved, res) { 445 unsigned long res_start, res_end; 446 447 res_start = memblock_region_reserved_base_pfn(res); 448 res_end = memblock_region_reserved_end_pfn(res); 449 450 if (res_end < start) 451 continue; 452 if (res_start < start) 453 res_start = start; 454 if (res_start > end) 455 res_start = end; 456 if (res_end > end) 457 res_end = end; 458 if (res_start != start) 459 free_area_high(start, res_start); 460 start = res_end; 461 if (start == end) 462 break; 463 } 464 465 /* And now free anything which remains */ 466 if (start < end) 467 free_area_high(start, end); 468 } 469 #endif 470 } 471 472 /* 473 * mem_init() marks the free areas in the mem_map and tells us how much 474 * memory is free. This is done after various parts of the system have 475 * claimed their memory after the kernel image. 476 */ 477 void __init mem_init(void) 478 { 479 #ifdef CONFIG_HAVE_TCM 480 /* These pointers are filled in on TCM detection */ 481 extern u32 dtcm_end; 482 extern u32 itcm_end; 483 #endif 484 485 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 486 487 /* this will put all unused low memory onto the freelists */ 488 free_unused_memmap(); 489 free_all_bootmem(); 490 491 #ifdef CONFIG_SA1111 492 /* now that our DMA memory is actually so designated, we can free it */ 493 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 494 #endif 495 496 free_highpages(); 497 498 mem_init_print_info(NULL); 499 500 #define MLK(b, t) b, t, ((t) - (b)) >> 10 501 #define MLM(b, t) b, t, ((t) - (b)) >> 20 502 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 503 504 pr_notice("Virtual kernel memory layout:\n" 505 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 506 #ifdef CONFIG_HAVE_TCM 507 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 508 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 509 #endif 510 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 511 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 512 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 513 #ifdef CONFIG_HIGHMEM 514 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 515 #endif 516 #ifdef CONFIG_MODULES 517 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 518 #endif 519 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 520 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 521 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 522 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 523 524 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 525 (PAGE_SIZE)), 526 #ifdef CONFIG_HAVE_TCM 527 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 528 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 529 #endif 530 MLK(FIXADDR_START, FIXADDR_END), 531 MLM(VMALLOC_START, VMALLOC_END), 532 MLM(PAGE_OFFSET, (unsigned long)high_memory), 533 #ifdef CONFIG_HIGHMEM 534 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 535 (PAGE_SIZE)), 536 #endif 537 #ifdef CONFIG_MODULES 538 MLM(MODULES_VADDR, MODULES_END), 539 #endif 540 541 MLK_ROUNDUP(_text, _etext), 542 MLK_ROUNDUP(__init_begin, __init_end), 543 MLK_ROUNDUP(_sdata, _edata), 544 MLK_ROUNDUP(__bss_start, __bss_stop)); 545 546 #undef MLK 547 #undef MLM 548 #undef MLK_ROUNDUP 549 550 /* 551 * Check boundaries twice: Some fundamental inconsistencies can 552 * be detected at build time already. 553 */ 554 #ifdef CONFIG_MMU 555 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 556 BUG_ON(TASK_SIZE > MODULES_VADDR); 557 #endif 558 559 #ifdef CONFIG_HIGHMEM 560 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 561 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 562 #endif 563 564 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 565 extern int sysctl_overcommit_memory; 566 /* 567 * On a machine this small we won't get 568 * anywhere without overcommit, so turn 569 * it on by default. 570 */ 571 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 572 } 573 } 574 575 #ifdef CONFIG_DEBUG_RODATA 576 struct section_perm { 577 const char *name; 578 unsigned long start; 579 unsigned long end; 580 pmdval_t mask; 581 pmdval_t prot; 582 pmdval_t clear; 583 }; 584 585 /* First section-aligned location at or after __start_rodata. */ 586 extern char __start_rodata_section_aligned[]; 587 588 static struct section_perm nx_perms[] = { 589 /* Make pages tables, etc before _stext RW (set NX). */ 590 { 591 .name = "pre-text NX", 592 .start = PAGE_OFFSET, 593 .end = (unsigned long)_stext, 594 .mask = ~PMD_SECT_XN, 595 .prot = PMD_SECT_XN, 596 }, 597 /* Make init RW (set NX). */ 598 { 599 .name = "init NX", 600 .start = (unsigned long)__init_begin, 601 .end = (unsigned long)_sdata, 602 .mask = ~PMD_SECT_XN, 603 .prot = PMD_SECT_XN, 604 }, 605 /* Make rodata NX (set RO in ro_perms below). */ 606 { 607 .name = "rodata NX", 608 .start = (unsigned long)__start_rodata_section_aligned, 609 .end = (unsigned long)__init_begin, 610 .mask = ~PMD_SECT_XN, 611 .prot = PMD_SECT_XN, 612 }, 613 }; 614 615 static struct section_perm ro_perms[] = { 616 /* Make kernel code and rodata RX (set RO). */ 617 { 618 .name = "text/rodata RO", 619 .start = (unsigned long)_stext, 620 .end = (unsigned long)__init_begin, 621 #ifdef CONFIG_ARM_LPAE 622 .mask = ~L_PMD_SECT_RDONLY, 623 .prot = L_PMD_SECT_RDONLY, 624 #else 625 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 626 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 627 .clear = PMD_SECT_AP_WRITE, 628 #endif 629 }, 630 }; 631 632 /* 633 * Updates section permissions only for the current mm (sections are 634 * copied into each mm). During startup, this is the init_mm. Is only 635 * safe to be called with preemption disabled, as under stop_machine(). 636 */ 637 static inline void section_update(unsigned long addr, pmdval_t mask, 638 pmdval_t prot, struct mm_struct *mm) 639 { 640 pmd_t *pmd; 641 642 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 643 644 #ifdef CONFIG_ARM_LPAE 645 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 646 #else 647 if (addr & SECTION_SIZE) 648 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 649 else 650 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 651 #endif 652 flush_pmd_entry(pmd); 653 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 654 } 655 656 /* Make sure extended page tables are in use. */ 657 static inline bool arch_has_strict_perms(void) 658 { 659 if (cpu_architecture() < CPU_ARCH_ARMv6) 660 return false; 661 662 return !!(get_cr() & CR_XP); 663 } 664 665 void set_section_perms(struct section_perm *perms, int n, bool set, 666 struct mm_struct *mm) 667 { 668 size_t i; 669 unsigned long addr; 670 671 if (!arch_has_strict_perms()) 672 return; 673 674 for (i = 0; i < n; i++) { 675 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || 676 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { 677 pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", 678 perms[i].name, perms[i].start, perms[i].end, 679 SECTION_SIZE); 680 continue; 681 } 682 683 for (addr = perms[i].start; 684 addr < perms[i].end; 685 addr += SECTION_SIZE) 686 section_update(addr, perms[i].mask, 687 set ? perms[i].prot : perms[i].clear, mm); 688 } 689 690 } 691 692 static void update_sections_early(struct section_perm perms[], int n) 693 { 694 struct task_struct *t, *s; 695 696 read_lock(&tasklist_lock); 697 for_each_process(t) { 698 if (t->flags & PF_KTHREAD) 699 continue; 700 for_each_thread(t, s) 701 set_section_perms(perms, n, true, s->mm); 702 } 703 read_unlock(&tasklist_lock); 704 set_section_perms(perms, n, true, current->active_mm); 705 set_section_perms(perms, n, true, &init_mm); 706 } 707 708 int __fix_kernmem_perms(void *unused) 709 { 710 update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); 711 return 0; 712 } 713 714 void fix_kernmem_perms(void) 715 { 716 stop_machine(__fix_kernmem_perms, NULL, NULL); 717 } 718 719 int __mark_rodata_ro(void *unused) 720 { 721 update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); 722 return 0; 723 } 724 725 void mark_rodata_ro(void) 726 { 727 stop_machine(__mark_rodata_ro, NULL, NULL); 728 } 729 730 void set_kernel_text_rw(void) 731 { 732 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, 733 current->active_mm); 734 } 735 736 void set_kernel_text_ro(void) 737 { 738 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, 739 current->active_mm); 740 } 741 742 #else 743 static inline void fix_kernmem_perms(void) { } 744 #endif /* CONFIG_DEBUG_RODATA */ 745 746 void free_tcmmem(void) 747 { 748 #ifdef CONFIG_HAVE_TCM 749 extern char __tcm_start, __tcm_end; 750 751 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 752 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 753 #endif 754 } 755 756 void free_initmem(void) 757 { 758 fix_kernmem_perms(); 759 free_tcmmem(); 760 761 poison_init_mem(__init_begin, __init_end - __init_begin); 762 if (!machine_is_integrator() && !machine_is_cintegrator()) 763 free_initmem_default(-1); 764 } 765 766 #ifdef CONFIG_BLK_DEV_INITRD 767 768 static int keep_initrd; 769 770 void free_initrd_mem(unsigned long start, unsigned long end) 771 { 772 if (!keep_initrd) { 773 if (start == initrd_start) 774 start = round_down(start, PAGE_SIZE); 775 if (end == initrd_end) 776 end = round_up(end, PAGE_SIZE); 777 778 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 779 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 780 } 781 } 782 783 static int __init keepinitrd_setup(char *__unused) 784 { 785 keep_initrd = 1; 786 return 1; 787 } 788 789 __setup("keepinitrd", keepinitrd_setup); 790 #endif 791