1 /* 2 * linux/arch/sh/mm/init.c 3 * 4 * Copyright (C) 1999 Niibe Yutaka 5 * Copyright (C) 2002 - 2011 Paul Mundt 6 * 7 * Based on linux/arch/i386/mm/init.c: 8 * Copyright (C) 1995 Linus Torvalds 9 */ 10 #include <linux/mm.h> 11 #include <linux/swap.h> 12 #include <linux/init.h> 13 #include <linux/gfp.h> 14 #include <linux/bootmem.h> 15 #include <linux/proc_fs.h> 16 #include <linux/pagemap.h> 17 #include <linux/percpu.h> 18 #include <linux/io.h> 19 #include <linux/memblock.h> 20 #include <linux/dma-mapping.h> 21 #include <asm/mmu_context.h> 22 #include <asm/mmzone.h> 23 #include <asm/kexec.h> 24 #include <asm/tlb.h> 25 #include <asm/cacheflush.h> 26 #include <asm/sections.h> 27 #include <asm/setup.h> 28 #include <asm/cache.h> 29 #include <asm/sizes.h> 30 31 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 32 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 33 34 void __init generic_mem_init(void) 35 { 36 memblock_add(__MEMORY_START, __MEMORY_SIZE); 37 } 38 39 void __init __weak plat_mem_setup(void) 40 { 41 /* Nothing to see here, move along. */ 42 } 43 44 #ifdef CONFIG_MMU 45 static pte_t *__get_pte_phys(unsigned long addr) 46 { 47 pgd_t *pgd; 48 pud_t *pud; 49 pmd_t *pmd; 50 51 pgd = pgd_offset_k(addr); 52 if (pgd_none(*pgd)) { 53 pgd_ERROR(*pgd); 54 return NULL; 55 } 56 57 pud = pud_alloc(NULL, pgd, addr); 58 if (unlikely(!pud)) { 59 pud_ERROR(*pud); 60 return NULL; 61 } 62 63 pmd = pmd_alloc(NULL, pud, addr); 64 if (unlikely(!pmd)) { 65 pmd_ERROR(*pmd); 66 return NULL; 67 } 68 69 return pte_offset_kernel(pmd, addr); 70 } 71 72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 73 { 74 pte_t *pte; 75 76 pte = __get_pte_phys(addr); 77 if (!pte_none(*pte)) { 78 pte_ERROR(*pte); 79 return; 80 } 81 82 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 83 local_flush_tlb_one(get_asid(), addr); 84 85 if (pgprot_val(prot) & _PAGE_WIRED) 86 tlb_wire_entry(NULL, addr, *pte); 87 } 88 89 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 90 { 91 pte_t *pte; 92 93 pte = __get_pte_phys(addr); 94 95 if (pgprot_val(prot) & _PAGE_WIRED) 96 tlb_unwire_entry(); 97 98 set_pte(pte, pfn_pte(0, __pgprot(0))); 99 local_flush_tlb_one(get_asid(), addr); 100 } 101 102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 103 { 104 unsigned long address = __fix_to_virt(idx); 105 106 if (idx >= __end_of_fixed_addresses) { 107 BUG(); 108 return; 109 } 110 111 set_pte_phys(address, phys, prot); 112 } 113 114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 115 { 116 unsigned long address = __fix_to_virt(idx); 117 118 if (idx >= __end_of_fixed_addresses) { 119 BUG(); 120 return; 121 } 122 123 clear_pte_phys(address, prot); 124 } 125 126 static pmd_t * __init one_md_table_init(pud_t *pud) 127 { 128 if (pud_none(*pud)) { 129 pmd_t *pmd; 130 131 pmd = alloc_bootmem_pages(PAGE_SIZE); 132 pud_populate(&init_mm, pud, pmd); 133 BUG_ON(pmd != pmd_offset(pud, 0)); 134 } 135 136 return pmd_offset(pud, 0); 137 } 138 139 static pte_t * __init one_page_table_init(pmd_t *pmd) 140 { 141 if (pmd_none(*pmd)) { 142 pte_t *pte; 143 144 pte = alloc_bootmem_pages(PAGE_SIZE); 145 pmd_populate_kernel(&init_mm, pmd, pte); 146 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 147 } 148 149 return pte_offset_kernel(pmd, 0); 150 } 151 152 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 153 unsigned long vaddr, pte_t *lastpte) 154 { 155 return pte; 156 } 157 158 void __init page_table_range_init(unsigned long start, unsigned long end, 159 pgd_t *pgd_base) 160 { 161 pgd_t *pgd; 162 pud_t *pud; 163 pmd_t *pmd; 164 pte_t *pte = NULL; 165 int i, j, k; 166 unsigned long vaddr; 167 168 vaddr = start; 169 i = __pgd_offset(vaddr); 170 j = __pud_offset(vaddr); 171 k = __pmd_offset(vaddr); 172 pgd = pgd_base + i; 173 174 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 175 pud = (pud_t *)pgd; 176 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 177 pmd = one_md_table_init(pud); 178 #ifndef __PAGETABLE_PMD_FOLDED 179 pmd += k; 180 #endif 181 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 182 pte = page_table_kmap_check(one_page_table_init(pmd), 183 pmd, vaddr, pte); 184 vaddr += PMD_SIZE; 185 } 186 k = 0; 187 } 188 j = 0; 189 } 190 } 191 #endif /* CONFIG_MMU */ 192 193 void __init allocate_pgdat(unsigned int nid) 194 { 195 unsigned long start_pfn, end_pfn; 196 #ifdef CONFIG_NEED_MULTIPLE_NODES 197 unsigned long phys; 198 #endif 199 200 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 201 202 #ifdef CONFIG_NEED_MULTIPLE_NODES 203 phys = __memblock_alloc_base(sizeof(struct pglist_data), 204 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT); 205 /* Retry with all of system memory */ 206 if (!phys) 207 phys = __memblock_alloc_base(sizeof(struct pglist_data), 208 SMP_CACHE_BYTES, memblock_end_of_DRAM()); 209 if (!phys) 210 panic("Can't allocate pgdat for node %d\n", nid); 211 212 NODE_DATA(nid) = __va(phys); 213 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); 214 215 NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; 216 #endif 217 218 NODE_DATA(nid)->node_start_pfn = start_pfn; 219 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 220 } 221 222 static void __init bootmem_init_one_node(unsigned int nid) 223 { 224 unsigned long total_pages, paddr; 225 unsigned long end_pfn; 226 struct pglist_data *p; 227 228 p = NODE_DATA(nid); 229 230 /* Nothing to do.. */ 231 if (!p->node_spanned_pages) 232 return; 233 234 end_pfn = p->node_start_pfn + p->node_spanned_pages; 235 236 total_pages = bootmem_bootmap_pages(p->node_spanned_pages); 237 238 paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE); 239 if (!paddr) 240 panic("Can't allocate bootmap for nid[%d]\n", nid); 241 242 init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn); 243 244 free_bootmem_with_active_regions(nid, end_pfn); 245 246 /* 247 * XXX Handle initial reservations for the system memory node 248 * only for the moment, we'll refactor this later for handling 249 * reservations in other nodes. 250 */ 251 if (nid == 0) { 252 struct memblock_region *reg; 253 254 /* Reserve the sections we're already using. */ 255 for_each_memblock(reserved, reg) { 256 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); 257 } 258 } 259 260 sparse_memory_present_with_active_regions(nid); 261 } 262 263 static void __init do_init_bootmem(void) 264 { 265 struct memblock_region *reg; 266 int i; 267 268 /* Add active regions with valid PFNs. */ 269 for_each_memblock(memory, reg) { 270 unsigned long start_pfn, end_pfn; 271 start_pfn = memblock_region_memory_base_pfn(reg); 272 end_pfn = memblock_region_memory_end_pfn(reg); 273 __add_active_range(0, start_pfn, end_pfn); 274 } 275 276 /* All of system RAM sits in node 0 for the non-NUMA case */ 277 allocate_pgdat(0); 278 node_set_online(0); 279 280 plat_mem_setup(); 281 282 for_each_online_node(i) 283 bootmem_init_one_node(i); 284 285 sparse_init(); 286 } 287 288 static void __init early_reserve_mem(void) 289 { 290 unsigned long start_pfn; 291 292 /* 293 * Partially used pages are not usable - thus 294 * we are rounding upwards: 295 */ 296 start_pfn = PFN_UP(__pa(_end)); 297 298 /* 299 * Reserve the kernel text and Reserve the bootmem bitmap. We do 300 * this in two steps (first step was init_bootmem()), because 301 * this catches the (definitely buggy) case of us accidentally 302 * initializing the bootmem allocator with an invalid RAM area. 303 */ 304 memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET, 305 (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - 306 (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET)); 307 308 /* 309 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 310 */ 311 if (CONFIG_ZERO_PAGE_OFFSET != 0) 312 memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET); 313 314 /* 315 * Handle additional early reservations 316 */ 317 check_for_initrd(); 318 reserve_crashkernel(); 319 } 320 321 void __init paging_init(void) 322 { 323 unsigned long max_zone_pfns[MAX_NR_ZONES]; 324 unsigned long vaddr, end; 325 int nid; 326 327 memblock_init(); 328 sh_mv.mv_mem_init(); 329 330 early_reserve_mem(); 331 332 /* 333 * Once the early reservations are out of the way, give the 334 * platforms a chance to kick out some memory. 335 */ 336 if (sh_mv.mv_mem_reserve) 337 sh_mv.mv_mem_reserve(); 338 339 memblock_enforce_memory_limit(memory_limit); 340 memblock_analyze(); 341 342 memblock_dump_all(); 343 344 /* 345 * Determine low and high memory ranges: 346 */ 347 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 348 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 349 350 nodes_clear(node_online_map); 351 352 memory_start = (unsigned long)__va(__MEMORY_START); 353 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 354 355 uncached_init(); 356 pmb_init(); 357 do_init_bootmem(); 358 ioremap_fixed_init(); 359 360 /* We don't need to map the kernel through the TLB, as 361 * it is permanatly mapped using P1. So clear the 362 * entire pgd. */ 363 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 364 365 /* Set an initial value for the MMU.TTB so we don't have to 366 * check for a null value. */ 367 set_TTB(swapper_pg_dir); 368 369 /* 370 * Populate the relevant portions of swapper_pg_dir so that 371 * we can use the fixmap entries without calling kmalloc. 372 * pte's will be filled in by __set_fixmap(). 373 */ 374 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 375 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 376 page_table_range_init(vaddr, end, swapper_pg_dir); 377 378 kmap_coherent_init(); 379 380 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 381 382 for_each_online_node(nid) { 383 pg_data_t *pgdat = NODE_DATA(nid); 384 unsigned long low, start_pfn; 385 386 start_pfn = pgdat->bdata->node_min_pfn; 387 low = pgdat->bdata->node_low_pfn; 388 389 if (max_zone_pfns[ZONE_NORMAL] < low) 390 max_zone_pfns[ZONE_NORMAL] = low; 391 392 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", 393 nid, start_pfn, low); 394 } 395 396 free_area_init_nodes(max_zone_pfns); 397 } 398 399 /* 400 * Early initialization for any I/O MMUs we might have. 401 */ 402 static void __init iommu_init(void) 403 { 404 no_iommu_init(); 405 } 406 407 unsigned int mem_init_done = 0; 408 409 void __init mem_init(void) 410 { 411 int codesize, datasize, initsize; 412 int nid; 413 414 iommu_init(); 415 416 num_physpages = 0; 417 high_memory = NULL; 418 419 for_each_online_node(nid) { 420 pg_data_t *pgdat = NODE_DATA(nid); 421 unsigned long node_pages = 0; 422 void *node_high_memory; 423 424 num_physpages += pgdat->node_present_pages; 425 426 if (pgdat->node_spanned_pages) 427 node_pages = free_all_bootmem_node(pgdat); 428 429 totalram_pages += node_pages; 430 431 node_high_memory = (void *)__va((pgdat->node_start_pfn + 432 pgdat->node_spanned_pages) << 433 PAGE_SHIFT); 434 if (node_high_memory > high_memory) 435 high_memory = node_high_memory; 436 } 437 438 /* Set this up early, so we can take care of the zero page */ 439 cpu_cache_init(); 440 441 /* clear the zero-page */ 442 memset(empty_zero_page, 0, PAGE_SIZE); 443 __flush_wback_region(empty_zero_page, PAGE_SIZE); 444 445 vsyscall_init(); 446 447 codesize = (unsigned long) &_etext - (unsigned long) &_text; 448 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 449 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 450 451 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " 452 "%dk data, %dk init)\n", 453 nr_free_pages() << (PAGE_SHIFT-10), 454 num_physpages << (PAGE_SHIFT-10), 455 codesize >> 10, 456 datasize >> 10, 457 initsize >> 10); 458 459 printk(KERN_INFO "virtual kernel memory layout:\n" 460 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 461 #ifdef CONFIG_HIGHMEM 462 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 463 #endif 464 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 465 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 466 #ifdef CONFIG_UNCACHED_MAPPING 467 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 468 #endif 469 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 470 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 471 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 472 FIXADDR_START, FIXADDR_TOP, 473 (FIXADDR_TOP - FIXADDR_START) >> 10, 474 475 #ifdef CONFIG_HIGHMEM 476 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 477 (LAST_PKMAP*PAGE_SIZE) >> 10, 478 #endif 479 480 (unsigned long)VMALLOC_START, VMALLOC_END, 481 (VMALLOC_END - VMALLOC_START) >> 20, 482 483 (unsigned long)memory_start, (unsigned long)high_memory, 484 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 485 486 #ifdef CONFIG_UNCACHED_MAPPING 487 uncached_start, uncached_end, uncached_size >> 20, 488 #endif 489 490 (unsigned long)&__init_begin, (unsigned long)&__init_end, 491 ((unsigned long)&__init_end - 492 (unsigned long)&__init_begin) >> 10, 493 494 (unsigned long)&_etext, (unsigned long)&_edata, 495 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 496 497 (unsigned long)&_text, (unsigned long)&_etext, 498 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 499 500 mem_init_done = 1; 501 } 502 503 void free_initmem(void) 504 { 505 unsigned long addr; 506 507 addr = (unsigned long)(&__init_begin); 508 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 509 ClearPageReserved(virt_to_page(addr)); 510 init_page_count(virt_to_page(addr)); 511 free_page(addr); 512 totalram_pages++; 513 } 514 printk("Freeing unused kernel memory: %ldk freed\n", 515 ((unsigned long)&__init_end - 516 (unsigned long)&__init_begin) >> 10); 517 } 518 519 #ifdef CONFIG_BLK_DEV_INITRD 520 void free_initrd_mem(unsigned long start, unsigned long end) 521 { 522 unsigned long p; 523 for (p = start; p < end; p += PAGE_SIZE) { 524 ClearPageReserved(virt_to_page(p)); 525 init_page_count(virt_to_page(p)); 526 free_page(p); 527 totalram_pages++; 528 } 529 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 530 } 531 #endif 532 533 #ifdef CONFIG_MEMORY_HOTPLUG 534 int arch_add_memory(int nid, u64 start, u64 size) 535 { 536 pg_data_t *pgdat; 537 unsigned long start_pfn = start >> PAGE_SHIFT; 538 unsigned long nr_pages = size >> PAGE_SHIFT; 539 int ret; 540 541 pgdat = NODE_DATA(nid); 542 543 /* We only have ZONE_NORMAL, so this is easy.. */ 544 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL, 545 start_pfn, nr_pages); 546 if (unlikely(ret)) 547 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 548 549 return ret; 550 } 551 EXPORT_SYMBOL_GPL(arch_add_memory); 552 553 #ifdef CONFIG_NUMA 554 int memory_add_physaddr_to_nid(u64 addr) 555 { 556 /* Node 0 for now.. */ 557 return 0; 558 } 559 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 560 #endif 561 562 #endif /* CONFIG_MEMORY_HOTPLUG */ 563