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 26 #include <asm/cp15.h> 27 #include <asm/mach-types.h> 28 #include <asm/memblock.h> 29 #include <asm/prom.h> 30 #include <asm/sections.h> 31 #include <asm/setup.h> 32 #include <asm/system_info.h> 33 #include <asm/tlb.h> 34 #include <asm/fixmap.h> 35 36 #include <asm/mach/arch.h> 37 #include <asm/mach/map.h> 38 39 #include "mm.h" 40 41 #ifdef CONFIG_CPU_CP15_MMU 42 unsigned long __init __clear_cr(unsigned long mask) 43 { 44 cr_alignment = cr_alignment & ~mask; 45 return cr_alignment; 46 } 47 #endif 48 49 static phys_addr_t phys_initrd_start __initdata = 0; 50 static unsigned long phys_initrd_size __initdata = 0; 51 52 static int __init early_initrd(char *p) 53 { 54 phys_addr_t start; 55 unsigned long size; 56 char *endp; 57 58 start = memparse(p, &endp); 59 if (*endp == ',') { 60 size = memparse(endp + 1, NULL); 61 62 phys_initrd_start = start; 63 phys_initrd_size = size; 64 } 65 return 0; 66 } 67 early_param("initrd", early_initrd); 68 69 static int __init parse_tag_initrd(const struct tag *tag) 70 { 71 pr_warn("ATAG_INITRD is deprecated; " 72 "please update your bootloader.\n"); 73 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 74 phys_initrd_size = tag->u.initrd.size; 75 return 0; 76 } 77 78 __tagtable(ATAG_INITRD, parse_tag_initrd); 79 80 static int __init parse_tag_initrd2(const struct tag *tag) 81 { 82 phys_initrd_start = tag->u.initrd.start; 83 phys_initrd_size = tag->u.initrd.size; 84 return 0; 85 } 86 87 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 88 89 /* 90 * This keeps memory configuration data used by a couple memory 91 * initialization functions, as well as show_mem() for the skipping 92 * of holes in the memory map. It is populated by arm_add_memory(). 93 */ 94 void show_mem(unsigned int filter) 95 { 96 int free = 0, total = 0, reserved = 0; 97 int shared = 0, cached = 0, slab = 0; 98 struct memblock_region *reg; 99 100 printk("Mem-info:\n"); 101 show_free_areas(filter); 102 103 for_each_memblock (memory, reg) { 104 unsigned int pfn1, pfn2; 105 struct page *page, *end; 106 107 pfn1 = memblock_region_memory_base_pfn(reg); 108 pfn2 = memblock_region_memory_end_pfn(reg); 109 110 page = pfn_to_page(pfn1); 111 end = pfn_to_page(pfn2 - 1) + 1; 112 113 do { 114 total++; 115 if (PageReserved(page)) 116 reserved++; 117 else if (PageSwapCache(page)) 118 cached++; 119 else if (PageSlab(page)) 120 slab++; 121 else if (!page_count(page)) 122 free++; 123 else 124 shared += page_count(page) - 1; 125 pfn1++; 126 page = pfn_to_page(pfn1); 127 } while (pfn1 < pfn2); 128 } 129 130 printk("%d pages of RAM\n", total); 131 printk("%d free pages\n", free); 132 printk("%d reserved pages\n", reserved); 133 printk("%d slab pages\n", slab); 134 printk("%d pages shared\n", shared); 135 printk("%d pages swap cached\n", cached); 136 } 137 138 static void __init find_limits(unsigned long *min, unsigned long *max_low, 139 unsigned long *max_high) 140 { 141 *max_low = PFN_DOWN(memblock_get_current_limit()); 142 *min = PFN_UP(memblock_start_of_DRAM()); 143 *max_high = PFN_DOWN(memblock_end_of_DRAM()); 144 } 145 146 #ifdef CONFIG_ZONE_DMA 147 148 phys_addr_t arm_dma_zone_size __read_mostly; 149 EXPORT_SYMBOL(arm_dma_zone_size); 150 151 /* 152 * The DMA mask corresponding to the maximum bus address allocatable 153 * using GFP_DMA. The default here places no restriction on DMA 154 * allocations. This must be the smallest DMA mask in the system, 155 * so a successful GFP_DMA allocation will always satisfy this. 156 */ 157 phys_addr_t arm_dma_limit; 158 unsigned long arm_dma_pfn_limit; 159 160 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 161 unsigned long dma_size) 162 { 163 if (size[0] <= dma_size) 164 return; 165 166 size[ZONE_NORMAL] = size[0] - dma_size; 167 size[ZONE_DMA] = dma_size; 168 hole[ZONE_NORMAL] = hole[0]; 169 hole[ZONE_DMA] = 0; 170 } 171 #endif 172 173 void __init setup_dma_zone(const struct machine_desc *mdesc) 174 { 175 #ifdef CONFIG_ZONE_DMA 176 if (mdesc->dma_zone_size) { 177 arm_dma_zone_size = mdesc->dma_zone_size; 178 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 179 } else 180 arm_dma_limit = 0xffffffff; 181 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 182 #endif 183 } 184 185 static void __init zone_sizes_init(unsigned long min, unsigned long max_low, 186 unsigned long max_high) 187 { 188 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 189 struct memblock_region *reg; 190 191 /* 192 * initialise the zones. 193 */ 194 memset(zone_size, 0, sizeof(zone_size)); 195 196 /* 197 * The memory size has already been determined. If we need 198 * to do anything fancy with the allocation of this memory 199 * to the zones, now is the time to do it. 200 */ 201 zone_size[0] = max_low - min; 202 #ifdef CONFIG_HIGHMEM 203 zone_size[ZONE_HIGHMEM] = max_high - max_low; 204 #endif 205 206 /* 207 * Calculate the size of the holes. 208 * holes = node_size - sum(bank_sizes) 209 */ 210 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 211 for_each_memblock(memory, reg) { 212 unsigned long start = memblock_region_memory_base_pfn(reg); 213 unsigned long end = memblock_region_memory_end_pfn(reg); 214 215 if (start < max_low) { 216 unsigned long low_end = min(end, max_low); 217 zhole_size[0] -= low_end - start; 218 } 219 #ifdef CONFIG_HIGHMEM 220 if (end > max_low) { 221 unsigned long high_start = max(start, max_low); 222 zhole_size[ZONE_HIGHMEM] -= end - high_start; 223 } 224 #endif 225 } 226 227 #ifdef CONFIG_ZONE_DMA 228 /* 229 * Adjust the sizes according to any special requirements for 230 * this machine type. 231 */ 232 if (arm_dma_zone_size) 233 arm_adjust_dma_zone(zone_size, zhole_size, 234 arm_dma_zone_size >> PAGE_SHIFT); 235 #endif 236 237 free_area_init_node(0, zone_size, min, zhole_size); 238 } 239 240 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 241 int pfn_valid(unsigned long pfn) 242 { 243 return memblock_is_memory(__pfn_to_phys(pfn)); 244 } 245 EXPORT_SYMBOL(pfn_valid); 246 #endif 247 248 #ifndef CONFIG_SPARSEMEM 249 static void __init arm_memory_present(void) 250 { 251 } 252 #else 253 static void __init arm_memory_present(void) 254 { 255 struct memblock_region *reg; 256 257 for_each_memblock(memory, reg) 258 memory_present(0, memblock_region_memory_base_pfn(reg), 259 memblock_region_memory_end_pfn(reg)); 260 } 261 #endif 262 263 static bool arm_memblock_steal_permitted = true; 264 265 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 266 { 267 phys_addr_t phys; 268 269 BUG_ON(!arm_memblock_steal_permitted); 270 271 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 272 memblock_free(phys, size); 273 memblock_remove(phys, size); 274 275 return phys; 276 } 277 278 void __init arm_memblock_init(const struct machine_desc *mdesc) 279 { 280 /* Register the kernel text, kernel data and initrd with memblock. */ 281 #ifdef CONFIG_XIP_KERNEL 282 memblock_reserve(__pa(_sdata), _end - _sdata); 283 #else 284 memblock_reserve(__pa(_stext), _end - _stext); 285 #endif 286 #ifdef CONFIG_BLK_DEV_INITRD 287 /* FDT scan will populate initrd_start */ 288 if (initrd_start && !phys_initrd_size) { 289 phys_initrd_start = __virt_to_phys(initrd_start); 290 phys_initrd_size = initrd_end - initrd_start; 291 } 292 initrd_start = initrd_end = 0; 293 if (phys_initrd_size && 294 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 295 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 296 (u64)phys_initrd_start, phys_initrd_size); 297 phys_initrd_start = phys_initrd_size = 0; 298 } 299 if (phys_initrd_size && 300 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 301 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 302 (u64)phys_initrd_start, phys_initrd_size); 303 phys_initrd_start = phys_initrd_size = 0; 304 } 305 if (phys_initrd_size) { 306 memblock_reserve(phys_initrd_start, phys_initrd_size); 307 308 /* Now convert initrd to virtual addresses */ 309 initrd_start = __phys_to_virt(phys_initrd_start); 310 initrd_end = initrd_start + phys_initrd_size; 311 } 312 #endif 313 314 arm_mm_memblock_reserve(); 315 316 /* reserve any platform specific memblock areas */ 317 if (mdesc->reserve) 318 mdesc->reserve(); 319 320 early_init_fdt_scan_reserved_mem(); 321 322 /* reserve memory for DMA contiguous allocations */ 323 dma_contiguous_reserve(arm_dma_limit); 324 325 arm_memblock_steal_permitted = false; 326 memblock_dump_all(); 327 } 328 329 void __init bootmem_init(void) 330 { 331 unsigned long min, max_low, max_high; 332 333 memblock_allow_resize(); 334 max_low = max_high = 0; 335 336 find_limits(&min, &max_low, &max_high); 337 338 /* 339 * Sparsemem tries to allocate bootmem in memory_present(), 340 * so must be done after the fixed reservations 341 */ 342 arm_memory_present(); 343 344 /* 345 * sparse_init() needs the bootmem allocator up and running. 346 */ 347 sparse_init(); 348 349 /* 350 * Now free the memory - free_area_init_node needs 351 * the sparse mem_map arrays initialized by sparse_init() 352 * for memmap_init_zone(), otherwise all PFNs are invalid. 353 */ 354 zone_sizes_init(min, max_low, max_high); 355 356 /* 357 * This doesn't seem to be used by the Linux memory manager any 358 * more, but is used by ll_rw_block. If we can get rid of it, we 359 * also get rid of some of the stuff above as well. 360 */ 361 min_low_pfn = min; 362 max_low_pfn = max_low; 363 max_pfn = max_high; 364 } 365 366 /* 367 * Poison init memory with an undefined instruction (ARM) or a branch to an 368 * undefined instruction (Thumb). 369 */ 370 static inline void poison_init_mem(void *s, size_t count) 371 { 372 u32 *p = (u32 *)s; 373 for (; count != 0; count -= 4) 374 *p++ = 0xe7fddef0; 375 } 376 377 static inline void 378 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 379 { 380 struct page *start_pg, *end_pg; 381 phys_addr_t pg, pgend; 382 383 /* 384 * Convert start_pfn/end_pfn to a struct page pointer. 385 */ 386 start_pg = pfn_to_page(start_pfn - 1) + 1; 387 end_pg = pfn_to_page(end_pfn - 1) + 1; 388 389 /* 390 * Convert to physical addresses, and 391 * round start upwards and end downwards. 392 */ 393 pg = PAGE_ALIGN(__pa(start_pg)); 394 pgend = __pa(end_pg) & PAGE_MASK; 395 396 /* 397 * If there are free pages between these, 398 * free the section of the memmap array. 399 */ 400 if (pg < pgend) 401 memblock_free_early(pg, pgend - pg); 402 } 403 404 /* 405 * The mem_map array can get very big. Free the unused area of the memory map. 406 */ 407 static void __init free_unused_memmap(void) 408 { 409 unsigned long start, prev_end = 0; 410 struct memblock_region *reg; 411 412 /* 413 * This relies on each bank being in address order. 414 * The banks are sorted previously in bootmem_init(). 415 */ 416 for_each_memblock(memory, reg) { 417 start = memblock_region_memory_base_pfn(reg); 418 419 #ifdef CONFIG_SPARSEMEM 420 /* 421 * Take care not to free memmap entries that don't exist 422 * due to SPARSEMEM sections which aren't present. 423 */ 424 start = min(start, 425 ALIGN(prev_end, PAGES_PER_SECTION)); 426 #else 427 /* 428 * Align down here since the VM subsystem insists that the 429 * memmap entries are valid from the bank start aligned to 430 * MAX_ORDER_NR_PAGES. 431 */ 432 start = round_down(start, MAX_ORDER_NR_PAGES); 433 #endif 434 /* 435 * If we had a previous bank, and there is a space 436 * between the current bank and the previous, free it. 437 */ 438 if (prev_end && prev_end < start) 439 free_memmap(prev_end, start); 440 441 /* 442 * Align up here since the VM subsystem insists that the 443 * memmap entries are valid from the bank end aligned to 444 * MAX_ORDER_NR_PAGES. 445 */ 446 prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 447 MAX_ORDER_NR_PAGES); 448 } 449 450 #ifdef CONFIG_SPARSEMEM 451 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 452 free_memmap(prev_end, 453 ALIGN(prev_end, PAGES_PER_SECTION)); 454 #endif 455 } 456 457 #ifdef CONFIG_HIGHMEM 458 static inline void free_area_high(unsigned long pfn, unsigned long end) 459 { 460 for (; pfn < end; pfn++) 461 free_highmem_page(pfn_to_page(pfn)); 462 } 463 #endif 464 465 static void __init free_highpages(void) 466 { 467 #ifdef CONFIG_HIGHMEM 468 unsigned long max_low = max_low_pfn; 469 struct memblock_region *mem, *res; 470 471 /* set highmem page free */ 472 for_each_memblock(memory, mem) { 473 unsigned long start = memblock_region_memory_base_pfn(mem); 474 unsigned long end = memblock_region_memory_end_pfn(mem); 475 476 /* Ignore complete lowmem entries */ 477 if (end <= max_low) 478 continue; 479 480 /* Truncate partial highmem entries */ 481 if (start < max_low) 482 start = max_low; 483 484 /* Find and exclude any reserved regions */ 485 for_each_memblock(reserved, res) { 486 unsigned long res_start, res_end; 487 488 res_start = memblock_region_reserved_base_pfn(res); 489 res_end = memblock_region_reserved_end_pfn(res); 490 491 if (res_end < start) 492 continue; 493 if (res_start < start) 494 res_start = start; 495 if (res_start > end) 496 res_start = end; 497 if (res_end > end) 498 res_end = end; 499 if (res_start != start) 500 free_area_high(start, res_start); 501 start = res_end; 502 if (start == end) 503 break; 504 } 505 506 /* And now free anything which remains */ 507 if (start < end) 508 free_area_high(start, end); 509 } 510 #endif 511 } 512 513 /* 514 * mem_init() marks the free areas in the mem_map and tells us how much 515 * memory is free. This is done after various parts of the system have 516 * claimed their memory after the kernel image. 517 */ 518 void __init mem_init(void) 519 { 520 #ifdef CONFIG_HAVE_TCM 521 /* These pointers are filled in on TCM detection */ 522 extern u32 dtcm_end; 523 extern u32 itcm_end; 524 #endif 525 526 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 527 528 /* this will put all unused low memory onto the freelists */ 529 free_unused_memmap(); 530 free_all_bootmem(); 531 532 #ifdef CONFIG_SA1111 533 /* now that our DMA memory is actually so designated, we can free it */ 534 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 535 #endif 536 537 free_highpages(); 538 539 mem_init_print_info(NULL); 540 541 #define MLK(b, t) b, t, ((t) - (b)) >> 10 542 #define MLM(b, t) b, t, ((t) - (b)) >> 20 543 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 544 545 pr_notice("Virtual kernel memory layout:\n" 546 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 547 #ifdef CONFIG_HAVE_TCM 548 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 549 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 550 #endif 551 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 552 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 553 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 554 #ifdef CONFIG_HIGHMEM 555 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 556 #endif 557 #ifdef CONFIG_MODULES 558 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 559 #endif 560 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 561 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 562 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 563 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 564 565 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 566 (PAGE_SIZE)), 567 #ifdef CONFIG_HAVE_TCM 568 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 569 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 570 #endif 571 MLK(FIXADDR_START, FIXADDR_END), 572 MLM(VMALLOC_START, VMALLOC_END), 573 MLM(PAGE_OFFSET, (unsigned long)high_memory), 574 #ifdef CONFIG_HIGHMEM 575 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 576 (PAGE_SIZE)), 577 #endif 578 #ifdef CONFIG_MODULES 579 MLM(MODULES_VADDR, MODULES_END), 580 #endif 581 582 MLK_ROUNDUP(_text, _etext), 583 MLK_ROUNDUP(__init_begin, __init_end), 584 MLK_ROUNDUP(_sdata, _edata), 585 MLK_ROUNDUP(__bss_start, __bss_stop)); 586 587 #undef MLK 588 #undef MLM 589 #undef MLK_ROUNDUP 590 591 /* 592 * Check boundaries twice: Some fundamental inconsistencies can 593 * be detected at build time already. 594 */ 595 #ifdef CONFIG_MMU 596 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 597 BUG_ON(TASK_SIZE > MODULES_VADDR); 598 #endif 599 600 #ifdef CONFIG_HIGHMEM 601 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 602 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 603 #endif 604 605 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 606 extern int sysctl_overcommit_memory; 607 /* 608 * On a machine this small we won't get 609 * anywhere without overcommit, so turn 610 * it on by default. 611 */ 612 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 613 } 614 } 615 616 #ifdef CONFIG_ARM_KERNMEM_PERMS 617 struct section_perm { 618 unsigned long start; 619 unsigned long end; 620 pmdval_t mask; 621 pmdval_t prot; 622 pmdval_t clear; 623 }; 624 625 static struct section_perm nx_perms[] = { 626 /* Make pages tables, etc before _stext RW (set NX). */ 627 { 628 .start = PAGE_OFFSET, 629 .end = (unsigned long)_stext, 630 .mask = ~PMD_SECT_XN, 631 .prot = PMD_SECT_XN, 632 }, 633 /* Make init RW (set NX). */ 634 { 635 .start = (unsigned long)__init_begin, 636 .end = (unsigned long)_sdata, 637 .mask = ~PMD_SECT_XN, 638 .prot = PMD_SECT_XN, 639 }, 640 #ifdef CONFIG_DEBUG_RODATA 641 /* Make rodata NX (set RO in ro_perms below). */ 642 { 643 .start = (unsigned long)__start_rodata, 644 .end = (unsigned long)__init_begin, 645 .mask = ~PMD_SECT_XN, 646 .prot = PMD_SECT_XN, 647 }, 648 #endif 649 }; 650 651 #ifdef CONFIG_DEBUG_RODATA 652 static struct section_perm ro_perms[] = { 653 /* Make kernel code and rodata RX (set RO). */ 654 { 655 .start = (unsigned long)_stext, 656 .end = (unsigned long)__init_begin, 657 #ifdef CONFIG_ARM_LPAE 658 .mask = ~L_PMD_SECT_RDONLY, 659 .prot = L_PMD_SECT_RDONLY, 660 #else 661 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 662 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 663 .clear = PMD_SECT_AP_WRITE, 664 #endif 665 }, 666 }; 667 #endif 668 669 /* 670 * Updates section permissions only for the current mm (sections are 671 * copied into each mm). During startup, this is the init_mm. Is only 672 * safe to be called with preemption disabled, as under stop_machine(). 673 */ 674 static inline void section_update(unsigned long addr, pmdval_t mask, 675 pmdval_t prot) 676 { 677 struct mm_struct *mm; 678 pmd_t *pmd; 679 680 mm = current->active_mm; 681 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 682 683 #ifdef CONFIG_ARM_LPAE 684 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 685 #else 686 if (addr & SECTION_SIZE) 687 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 688 else 689 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 690 #endif 691 flush_pmd_entry(pmd); 692 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 693 } 694 695 /* Make sure extended page tables are in use. */ 696 static inline bool arch_has_strict_perms(void) 697 { 698 if (cpu_architecture() < CPU_ARCH_ARMv6) 699 return false; 700 701 return !!(get_cr() & CR_XP); 702 } 703 704 #define set_section_perms(perms, field) { \ 705 size_t i; \ 706 unsigned long addr; \ 707 \ 708 if (!arch_has_strict_perms()) \ 709 return; \ 710 \ 711 for (i = 0; i < ARRAY_SIZE(perms); i++) { \ 712 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || \ 713 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { \ 714 pr_err("BUG: section %lx-%lx not aligned to %lx\n", \ 715 perms[i].start, perms[i].end, \ 716 SECTION_SIZE); \ 717 continue; \ 718 } \ 719 \ 720 for (addr = perms[i].start; \ 721 addr < perms[i].end; \ 722 addr += SECTION_SIZE) \ 723 section_update(addr, perms[i].mask, \ 724 perms[i].field); \ 725 } \ 726 } 727 728 static inline void fix_kernmem_perms(void) 729 { 730 set_section_perms(nx_perms, prot); 731 } 732 733 #ifdef CONFIG_DEBUG_RODATA 734 void mark_rodata_ro(void) 735 { 736 set_section_perms(ro_perms, prot); 737 } 738 739 void set_kernel_text_rw(void) 740 { 741 set_section_perms(ro_perms, clear); 742 } 743 744 void set_kernel_text_ro(void) 745 { 746 set_section_perms(ro_perms, prot); 747 } 748 #endif /* CONFIG_DEBUG_RODATA */ 749 750 #else 751 static inline void fix_kernmem_perms(void) { } 752 #endif /* CONFIG_ARM_KERNMEM_PERMS */ 753 754 void free_tcmmem(void) 755 { 756 #ifdef CONFIG_HAVE_TCM 757 extern char __tcm_start, __tcm_end; 758 759 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 760 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 761 #endif 762 } 763 764 void free_initmem(void) 765 { 766 fix_kernmem_perms(); 767 free_tcmmem(); 768 769 poison_init_mem(__init_begin, __init_end - __init_begin); 770 if (!machine_is_integrator() && !machine_is_cintegrator()) 771 free_initmem_default(-1); 772 } 773 774 #ifdef CONFIG_BLK_DEV_INITRD 775 776 static int keep_initrd; 777 778 void free_initrd_mem(unsigned long start, unsigned long end) 779 { 780 if (!keep_initrd) { 781 if (start == initrd_start) 782 start = round_down(start, PAGE_SIZE); 783 if (end == initrd_end) 784 end = round_up(end, PAGE_SIZE); 785 786 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 787 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 788 } 789 } 790 791 static int __init keepinitrd_setup(char *__unused) 792 { 793 keep_initrd = 1; 794 return 1; 795 } 796 797 __setup("keepinitrd", keepinitrd_setup); 798 #endif 799