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