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