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_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 /* Truncate partial highmem entries */ 437 if (start < max_low) 438 start = max_low; 439 440 /* Find and exclude any reserved regions */ 441 for_each_memblock(reserved, res) { 442 unsigned long res_start, res_end; 443 444 res_start = memblock_region_reserved_base_pfn(res); 445 res_end = memblock_region_reserved_end_pfn(res); 446 447 if (res_end < start) 448 continue; 449 if (res_start < start) 450 res_start = start; 451 if (res_start > end) 452 res_start = end; 453 if (res_end > end) 454 res_end = end; 455 if (res_start != start) 456 free_area_high(start, res_start); 457 start = res_end; 458 if (start == end) 459 break; 460 } 461 462 /* And now free anything which remains */ 463 if (start < end) 464 free_area_high(start, end); 465 } 466 #endif 467 } 468 469 /* 470 * mem_init() marks the free areas in the mem_map and tells us how much 471 * memory is free. This is done after various parts of the system have 472 * claimed their memory after the kernel image. 473 */ 474 void __init mem_init(void) 475 { 476 #ifdef CONFIG_HAVE_TCM 477 /* These pointers are filled in on TCM detection */ 478 extern u32 dtcm_end; 479 extern u32 itcm_end; 480 #endif 481 482 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 483 484 /* this will put all unused low memory onto the freelists */ 485 free_unused_memmap(); 486 free_all_bootmem(); 487 488 #ifdef CONFIG_SA1111 489 /* now that our DMA memory is actually so designated, we can free it */ 490 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 491 #endif 492 493 free_highpages(); 494 495 mem_init_print_info(NULL); 496 497 #define MLK(b, t) b, t, ((t) - (b)) >> 10 498 #define MLM(b, t) b, t, ((t) - (b)) >> 20 499 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 500 501 pr_notice("Virtual kernel memory layout:\n" 502 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 503 #ifdef CONFIG_HAVE_TCM 504 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 505 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 506 #endif 507 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 508 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 509 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 510 #ifdef CONFIG_HIGHMEM 511 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 512 #endif 513 #ifdef CONFIG_MODULES 514 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 515 #endif 516 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 517 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 518 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 519 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 520 521 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 522 (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_ARM_KERNMEM_PERMS 573 struct section_perm { 574 unsigned long start; 575 unsigned long end; 576 pmdval_t mask; 577 pmdval_t prot; 578 pmdval_t clear; 579 }; 580 581 static struct section_perm nx_perms[] = { 582 /* Make pages tables, etc before _stext RW (set NX). */ 583 { 584 .start = PAGE_OFFSET, 585 .end = (unsigned long)_stext, 586 .mask = ~PMD_SECT_XN, 587 .prot = PMD_SECT_XN, 588 }, 589 /* Make init RW (set NX). */ 590 { 591 .start = (unsigned long)__init_begin, 592 .end = (unsigned long)_sdata, 593 .mask = ~PMD_SECT_XN, 594 .prot = PMD_SECT_XN, 595 }, 596 #ifdef CONFIG_DEBUG_RODATA 597 /* Make rodata NX (set RO in ro_perms below). */ 598 { 599 .start = (unsigned long)__start_rodata, 600 .end = (unsigned long)__init_begin, 601 .mask = ~PMD_SECT_XN, 602 .prot = PMD_SECT_XN, 603 }, 604 #endif 605 }; 606 607 #ifdef CONFIG_DEBUG_RODATA 608 static struct section_perm ro_perms[] = { 609 /* Make kernel code and rodata RX (set RO). */ 610 { 611 .start = (unsigned long)_stext, 612 .end = (unsigned long)__init_begin, 613 #ifdef CONFIG_ARM_LPAE 614 .mask = ~L_PMD_SECT_RDONLY, 615 .prot = L_PMD_SECT_RDONLY, 616 #else 617 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 618 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 619 .clear = PMD_SECT_AP_WRITE, 620 #endif 621 }, 622 }; 623 #endif 624 625 /* 626 * Updates section permissions only for the current mm (sections are 627 * copied into each mm). During startup, this is the init_mm. Is only 628 * safe to be called with preemption disabled, as under stop_machine(). 629 */ 630 static inline void section_update(unsigned long addr, pmdval_t mask, 631 pmdval_t prot, struct mm_struct *mm) 632 { 633 pmd_t *pmd; 634 635 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 636 637 #ifdef CONFIG_ARM_LPAE 638 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 639 #else 640 if (addr & SECTION_SIZE) 641 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 642 else 643 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 644 #endif 645 flush_pmd_entry(pmd); 646 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 647 } 648 649 /* Make sure extended page tables are in use. */ 650 static inline bool arch_has_strict_perms(void) 651 { 652 if (cpu_architecture() < CPU_ARCH_ARMv6) 653 return false; 654 655 return !!(get_cr() & CR_XP); 656 } 657 658 void set_section_perms(struct section_perm *perms, int n, bool set, 659 struct mm_struct *mm) 660 { 661 size_t i; 662 unsigned long addr; 663 664 if (!arch_has_strict_perms()) 665 return; 666 667 for (i = 0; i < n; i++) { 668 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || 669 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { 670 pr_err("BUG: section %lx-%lx not aligned to %lx\n", 671 perms[i].start, perms[i].end, 672 SECTION_SIZE); 673 continue; 674 } 675 676 for (addr = perms[i].start; 677 addr < perms[i].end; 678 addr += SECTION_SIZE) 679 section_update(addr, perms[i].mask, 680 set ? perms[i].prot : perms[i].clear, mm); 681 } 682 683 } 684 685 static void update_sections_early(struct section_perm perms[], int n) 686 { 687 struct task_struct *t, *s; 688 689 read_lock(&tasklist_lock); 690 for_each_process(t) { 691 if (t->flags & PF_KTHREAD) 692 continue; 693 for_each_thread(t, s) 694 set_section_perms(perms, n, true, s->mm); 695 } 696 read_unlock(&tasklist_lock); 697 set_section_perms(perms, n, true, current->active_mm); 698 set_section_perms(perms, n, true, &init_mm); 699 } 700 701 int __fix_kernmem_perms(void *unused) 702 { 703 update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); 704 return 0; 705 } 706 707 void fix_kernmem_perms(void) 708 { 709 stop_machine(__fix_kernmem_perms, NULL, NULL); 710 } 711 712 #ifdef CONFIG_DEBUG_RODATA 713 int __mark_rodata_ro(void *unused) 714 { 715 update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); 716 return 0; 717 } 718 719 void mark_rodata_ro(void) 720 { 721 stop_machine(__mark_rodata_ro, NULL, NULL); 722 } 723 724 void set_kernel_text_rw(void) 725 { 726 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, 727 current->active_mm); 728 } 729 730 void set_kernel_text_ro(void) 731 { 732 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, 733 current->active_mm); 734 } 735 #endif /* CONFIG_DEBUG_RODATA */ 736 737 #else 738 static inline void fix_kernmem_perms(void) { } 739 #endif /* CONFIG_ARM_KERNMEM_PERMS */ 740 741 void free_tcmmem(void) 742 { 743 #ifdef CONFIG_HAVE_TCM 744 extern char __tcm_start, __tcm_end; 745 746 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 747 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 748 #endif 749 } 750 751 void free_initmem(void) 752 { 753 fix_kernmem_perms(); 754 free_tcmmem(); 755 756 poison_init_mem(__init_begin, __init_end - __init_begin); 757 if (!machine_is_integrator() && !machine_is_cintegrator()) 758 free_initmem_default(-1); 759 } 760 761 #ifdef CONFIG_BLK_DEV_INITRD 762 763 static int keep_initrd; 764 765 void free_initrd_mem(unsigned long start, unsigned long end) 766 { 767 if (!keep_initrd) { 768 if (start == initrd_start) 769 start = round_down(start, PAGE_SIZE); 770 if (end == initrd_end) 771 end = round_up(end, PAGE_SIZE); 772 773 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 774 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 775 } 776 } 777 778 static int __init keepinitrd_setup(char *__unused) 779 { 780 keep_initrd = 1; 781 return 1; 782 } 783 784 __setup("keepinitrd", keepinitrd_setup); 785 #endif 786