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 void __init arm_memblock_init(const struct machine_desc *mdesc) 232 { 233 /* Register the kernel text, kernel data and initrd with memblock. */ 234 memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START); 235 236 #ifdef CONFIG_BLK_DEV_INITRD 237 /* FDT scan will populate initrd_start */ 238 if (initrd_start && !phys_initrd_size) { 239 phys_initrd_start = __virt_to_phys(initrd_start); 240 phys_initrd_size = initrd_end - initrd_start; 241 } 242 initrd_start = initrd_end = 0; 243 if (phys_initrd_size && 244 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 245 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 246 (u64)phys_initrd_start, phys_initrd_size); 247 phys_initrd_start = phys_initrd_size = 0; 248 } 249 if (phys_initrd_size && 250 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 251 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 252 (u64)phys_initrd_start, phys_initrd_size); 253 phys_initrd_start = phys_initrd_size = 0; 254 } 255 if (phys_initrd_size) { 256 memblock_reserve(phys_initrd_start, phys_initrd_size); 257 258 /* Now convert initrd to virtual addresses */ 259 initrd_start = __phys_to_virt(phys_initrd_start); 260 initrd_end = initrd_start + phys_initrd_size; 261 } 262 #endif 263 264 arm_mm_memblock_reserve(); 265 266 /* reserve any platform specific memblock areas */ 267 if (mdesc->reserve) 268 mdesc->reserve(); 269 270 early_init_fdt_reserve_self(); 271 early_init_fdt_scan_reserved_mem(); 272 273 /* reserve memory for DMA contiguous allocations */ 274 dma_contiguous_reserve(arm_dma_limit); 275 276 arm_memblock_steal_permitted = false; 277 memblock_dump_all(); 278 } 279 280 void __init bootmem_init(void) 281 { 282 unsigned long min, max_low, max_high; 283 284 memblock_allow_resize(); 285 max_low = max_high = 0; 286 287 find_limits(&min, &max_low, &max_high); 288 289 early_memtest((phys_addr_t)min << PAGE_SHIFT, 290 (phys_addr_t)max_low << PAGE_SHIFT); 291 292 /* 293 * Sparsemem tries to allocate bootmem in memory_present(), 294 * so must be done after the fixed reservations 295 */ 296 arm_memory_present(); 297 298 /* 299 * sparse_init() needs the bootmem allocator up and running. 300 */ 301 sparse_init(); 302 303 /* 304 * Now free the memory - free_area_init_node needs 305 * the sparse mem_map arrays initialized by sparse_init() 306 * for memmap_init_zone(), otherwise all PFNs are invalid. 307 */ 308 zone_sizes_init(min, max_low, max_high); 309 310 /* 311 * This doesn't seem to be used by the Linux memory manager any 312 * more, but is used by ll_rw_block. If we can get rid of it, we 313 * also get rid of some of the stuff above as well. 314 */ 315 min_low_pfn = min; 316 max_low_pfn = max_low; 317 max_pfn = max_high; 318 } 319 320 /* 321 * Poison init memory with an undefined instruction (ARM) or a branch to an 322 * undefined instruction (Thumb). 323 */ 324 static inline void poison_init_mem(void *s, size_t count) 325 { 326 u32 *p = (u32 *)s; 327 for (; count != 0; count -= 4) 328 *p++ = 0xe7fddef0; 329 } 330 331 static inline void 332 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 333 { 334 struct page *start_pg, *end_pg; 335 phys_addr_t pg, pgend; 336 337 /* 338 * Convert start_pfn/end_pfn to a struct page pointer. 339 */ 340 start_pg = pfn_to_page(start_pfn - 1) + 1; 341 end_pg = pfn_to_page(end_pfn - 1) + 1; 342 343 /* 344 * Convert to physical addresses, and 345 * round start upwards and end downwards. 346 */ 347 pg = PAGE_ALIGN(__pa(start_pg)); 348 pgend = __pa(end_pg) & PAGE_MASK; 349 350 /* 351 * If there are free pages between these, 352 * free the section of the memmap array. 353 */ 354 if (pg < pgend) 355 memblock_free_early(pg, pgend - pg); 356 } 357 358 /* 359 * The mem_map array can get very big. Free the unused area of the memory map. 360 */ 361 static void __init free_unused_memmap(void) 362 { 363 unsigned long start, prev_end = 0; 364 struct memblock_region *reg; 365 366 /* 367 * This relies on each bank being in address order. 368 * The banks are sorted previously in bootmem_init(). 369 */ 370 for_each_memblock(memory, reg) { 371 start = memblock_region_memory_base_pfn(reg); 372 373 #ifdef CONFIG_SPARSEMEM 374 /* 375 * Take care not to free memmap entries that don't exist 376 * due to SPARSEMEM sections which aren't present. 377 */ 378 start = min(start, 379 ALIGN(prev_end, PAGES_PER_SECTION)); 380 #else 381 /* 382 * Align down here since the VM subsystem insists that the 383 * memmap entries are valid from the bank start aligned to 384 * MAX_ORDER_NR_PAGES. 385 */ 386 start = round_down(start, MAX_ORDER_NR_PAGES); 387 #endif 388 /* 389 * If we had a previous bank, and there is a space 390 * between the current bank and the previous, free it. 391 */ 392 if (prev_end && prev_end < start) 393 free_memmap(prev_end, start); 394 395 /* 396 * Align up here since the VM subsystem insists that the 397 * memmap entries are valid from the bank end aligned to 398 * MAX_ORDER_NR_PAGES. 399 */ 400 prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 401 MAX_ORDER_NR_PAGES); 402 } 403 404 #ifdef CONFIG_SPARSEMEM 405 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 406 free_memmap(prev_end, 407 ALIGN(prev_end, PAGES_PER_SECTION)); 408 #endif 409 } 410 411 #ifdef CONFIG_HIGHMEM 412 static inline void free_area_high(unsigned long pfn, unsigned long end) 413 { 414 for (; pfn < end; pfn++) 415 free_highmem_page(pfn_to_page(pfn)); 416 } 417 #endif 418 419 static void __init free_highpages(void) 420 { 421 #ifdef CONFIG_HIGHMEM 422 unsigned long max_low = max_low_pfn; 423 struct memblock_region *mem, *res; 424 425 /* set highmem page free */ 426 for_each_memblock(memory, mem) { 427 unsigned long start = memblock_region_memory_base_pfn(mem); 428 unsigned long end = memblock_region_memory_end_pfn(mem); 429 430 /* Ignore complete lowmem entries */ 431 if (end <= max_low) 432 continue; 433 434 if (memblock_is_nomap(mem)) 435 continue; 436 437 /* Truncate partial highmem entries */ 438 if (start < max_low) 439 start = max_low; 440 441 /* Find and exclude any reserved regions */ 442 for_each_memblock(reserved, res) { 443 unsigned long res_start, res_end; 444 445 res_start = memblock_region_reserved_base_pfn(res); 446 res_end = memblock_region_reserved_end_pfn(res); 447 448 if (res_end < start) 449 continue; 450 if (res_start < start) 451 res_start = start; 452 if (res_start > end) 453 res_start = end; 454 if (res_end > end) 455 res_end = end; 456 if (res_start != start) 457 free_area_high(start, res_start); 458 start = res_end; 459 if (start == end) 460 break; 461 } 462 463 /* And now free anything which remains */ 464 if (start < end) 465 free_area_high(start, end); 466 } 467 #endif 468 } 469 470 /* 471 * mem_init() marks the free areas in the mem_map and tells us how much 472 * memory is free. This is done after various parts of the system have 473 * claimed their memory after the kernel image. 474 */ 475 void __init mem_init(void) 476 { 477 #ifdef CONFIG_HAVE_TCM 478 /* These pointers are filled in on TCM detection */ 479 extern u32 dtcm_end; 480 extern u32 itcm_end; 481 #endif 482 483 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 484 485 /* this will put all unused low memory onto the freelists */ 486 free_unused_memmap(); 487 free_all_bootmem(); 488 489 #ifdef CONFIG_SA1111 490 /* now that our DMA memory is actually so designated, we can free it */ 491 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 492 #endif 493 494 free_highpages(); 495 496 mem_init_print_info(NULL); 497 498 #define MLK(b, t) b, t, ((t) - (b)) >> 10 499 #define MLM(b, t) b, t, ((t) - (b)) >> 20 500 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 501 502 pr_notice("Virtual kernel memory layout:\n" 503 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 504 #ifdef CONFIG_HAVE_TCM 505 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 506 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 507 #endif 508 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 509 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 510 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 511 #ifdef CONFIG_HIGHMEM 512 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 513 #endif 514 #ifdef CONFIG_MODULES 515 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 516 #endif 517 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 518 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 519 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 520 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 521 522 MLK(VECTORS_BASE, VECTORS_BASE + PAGE_SIZE), 523 #ifdef CONFIG_HAVE_TCM 524 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 525 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 526 #endif 527 MLK(FIXADDR_START, FIXADDR_END), 528 MLM(VMALLOC_START, VMALLOC_END), 529 MLM(PAGE_OFFSET, (unsigned long)high_memory), 530 #ifdef CONFIG_HIGHMEM 531 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 532 (PAGE_SIZE)), 533 #endif 534 #ifdef CONFIG_MODULES 535 MLM(MODULES_VADDR, MODULES_END), 536 #endif 537 538 MLK_ROUNDUP(_text, _etext), 539 MLK_ROUNDUP(__init_begin, __init_end), 540 MLK_ROUNDUP(_sdata, _edata), 541 MLK_ROUNDUP(__bss_start, __bss_stop)); 542 543 #undef MLK 544 #undef MLM 545 #undef MLK_ROUNDUP 546 547 /* 548 * Check boundaries twice: Some fundamental inconsistencies can 549 * be detected at build time already. 550 */ 551 #ifdef CONFIG_MMU 552 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 553 BUG_ON(TASK_SIZE > MODULES_VADDR); 554 #endif 555 556 #ifdef CONFIG_HIGHMEM 557 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 558 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 559 #endif 560 561 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 562 extern int sysctl_overcommit_memory; 563 /* 564 * On a machine this small we won't get 565 * anywhere without overcommit, so turn 566 * it on by default. 567 */ 568 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 569 } 570 } 571 572 #ifdef CONFIG_DEBUG_RODATA 573 struct section_perm { 574 const char *name; 575 unsigned long start; 576 unsigned long end; 577 pmdval_t mask; 578 pmdval_t prot; 579 pmdval_t clear; 580 }; 581 582 /* First section-aligned location at or after __start_rodata. */ 583 extern char __start_rodata_section_aligned[]; 584 585 static struct section_perm nx_perms[] = { 586 /* Make pages tables, etc before _stext RW (set NX). */ 587 { 588 .name = "pre-text NX", 589 .start = PAGE_OFFSET, 590 .end = (unsigned long)_stext, 591 .mask = ~PMD_SECT_XN, 592 .prot = PMD_SECT_XN, 593 }, 594 /* Make init RW (set NX). */ 595 { 596 .name = "init NX", 597 .start = (unsigned long)__init_begin, 598 .end = (unsigned long)_sdata, 599 .mask = ~PMD_SECT_XN, 600 .prot = PMD_SECT_XN, 601 }, 602 /* Make rodata NX (set RO in ro_perms below). */ 603 { 604 .name = "rodata NX", 605 .start = (unsigned long)__start_rodata_section_aligned, 606 .end = (unsigned long)__init_begin, 607 .mask = ~PMD_SECT_XN, 608 .prot = PMD_SECT_XN, 609 }, 610 }; 611 612 static struct section_perm ro_perms[] = { 613 /* Make kernel code and rodata RX (set RO). */ 614 { 615 .name = "text/rodata RO", 616 .start = (unsigned long)_stext, 617 .end = (unsigned long)__init_begin, 618 #ifdef CONFIG_ARM_LPAE 619 .mask = ~L_PMD_SECT_RDONLY, 620 .prot = L_PMD_SECT_RDONLY, 621 #else 622 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 623 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 624 .clear = PMD_SECT_AP_WRITE, 625 #endif 626 }, 627 }; 628 629 /* 630 * Updates section permissions only for the current mm (sections are 631 * copied into each mm). During startup, this is the init_mm. Is only 632 * safe to be called with preemption disabled, as under stop_machine(). 633 */ 634 static inline void section_update(unsigned long addr, pmdval_t mask, 635 pmdval_t prot, struct mm_struct *mm) 636 { 637 pmd_t *pmd; 638 639 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 640 641 #ifdef CONFIG_ARM_LPAE 642 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 643 #else 644 if (addr & SECTION_SIZE) 645 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 646 else 647 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 648 #endif 649 flush_pmd_entry(pmd); 650 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 651 } 652 653 /* Make sure extended page tables are in use. */ 654 static inline bool arch_has_strict_perms(void) 655 { 656 if (cpu_architecture() < CPU_ARCH_ARMv6) 657 return false; 658 659 return !!(get_cr() & CR_XP); 660 } 661 662 void set_section_perms(struct section_perm *perms, int n, bool set, 663 struct mm_struct *mm) 664 { 665 size_t i; 666 unsigned long addr; 667 668 if (!arch_has_strict_perms()) 669 return; 670 671 for (i = 0; i < n; i++) { 672 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || 673 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { 674 pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", 675 perms[i].name, perms[i].start, perms[i].end, 676 SECTION_SIZE); 677 continue; 678 } 679 680 for (addr = perms[i].start; 681 addr < perms[i].end; 682 addr += SECTION_SIZE) 683 section_update(addr, perms[i].mask, 684 set ? perms[i].prot : perms[i].clear, mm); 685 } 686 687 } 688 689 static void update_sections_early(struct section_perm perms[], int n) 690 { 691 struct task_struct *t, *s; 692 693 read_lock(&tasklist_lock); 694 for_each_process(t) { 695 if (t->flags & PF_KTHREAD) 696 continue; 697 for_each_thread(t, s) 698 set_section_perms(perms, n, true, s->mm); 699 } 700 read_unlock(&tasklist_lock); 701 set_section_perms(perms, n, true, current->active_mm); 702 set_section_perms(perms, n, true, &init_mm); 703 } 704 705 int __fix_kernmem_perms(void *unused) 706 { 707 update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); 708 return 0; 709 } 710 711 void fix_kernmem_perms(void) 712 { 713 stop_machine(__fix_kernmem_perms, NULL, NULL); 714 } 715 716 int __mark_rodata_ro(void *unused) 717 { 718 update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); 719 return 0; 720 } 721 722 void mark_rodata_ro(void) 723 { 724 stop_machine(__mark_rodata_ro, NULL, NULL); 725 } 726 727 void set_kernel_text_rw(void) 728 { 729 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, 730 current->active_mm); 731 } 732 733 void set_kernel_text_ro(void) 734 { 735 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, 736 current->active_mm); 737 } 738 739 #else 740 static inline void fix_kernmem_perms(void) { } 741 #endif /* CONFIG_DEBUG_RODATA */ 742 743 void free_tcmmem(void) 744 { 745 #ifdef CONFIG_HAVE_TCM 746 extern char __tcm_start, __tcm_end; 747 748 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 749 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 750 #endif 751 } 752 753 void free_initmem(void) 754 { 755 fix_kernmem_perms(); 756 free_tcmmem(); 757 758 poison_init_mem(__init_begin, __init_end - __init_begin); 759 if (!machine_is_integrator() && !machine_is_cintegrator()) 760 free_initmem_default(-1); 761 } 762 763 #ifdef CONFIG_BLK_DEV_INITRD 764 765 static int keep_initrd; 766 767 void free_initrd_mem(unsigned long start, unsigned long end) 768 { 769 if (!keep_initrd) { 770 if (start == initrd_start) 771 start = round_down(start, PAGE_SIZE); 772 if (end == initrd_end) 773 end = round_up(end, PAGE_SIZE); 774 775 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 776 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 777 } 778 } 779 780 static int __init keepinitrd_setup(char *__unused) 781 { 782 keep_initrd = 1; 783 return 1; 784 } 785 786 __setup("keepinitrd", keepinitrd_setup); 787 #endif 788