1/* 2 * linux/arch/sh/mm/init.c 3 * 4 * Copyright (C) 1999 Niibe Yutaka 5 * Copyright (C) 2002 - 2010 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 31DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 32pgd_t swapper_pg_dir[PTRS_PER_PGD]; 33 34void __init generic_mem_init(void) 35{ 36 memblock_add(__MEMORY_START, __MEMORY_SIZE); 37} 38 39void __init __weak plat_mem_setup(void) 40{ 41 /* Nothing to see here, move along. */ 42} 43 44#ifdef CONFIG_MMU 45static pte_t *__get_pte_phys(unsigned long addr) 46{ 47 pgd_t *pgd; 48 pud_t *pud; 49 pmd_t *pmd; 50 pte_t *pte; 51 52 pgd = pgd_offset_k(addr); 53 if (pgd_none(*pgd)) { 54 pgd_ERROR(*pgd); 55 return NULL; 56 } 57 58 pud = pud_alloc(NULL, pgd, addr); 59 if (unlikely(!pud)) { 60 pud_ERROR(*pud); 61 return NULL; 62 } 63 64 pmd = pmd_alloc(NULL, pud, addr); 65 if (unlikely(!pmd)) { 66 pmd_ERROR(*pmd); 67 return NULL; 68 } 69 70 pte = pte_offset_kernel(pmd, addr); 71 return pte; 72} 73 74static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 75{ 76 pte_t *pte; 77 78 pte = __get_pte_phys(addr); 79 if (!pte_none(*pte)) { 80 pte_ERROR(*pte); 81 return; 82 } 83 84 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 85 local_flush_tlb_one(get_asid(), addr); 86 87 if (pgprot_val(prot) & _PAGE_WIRED) 88 tlb_wire_entry(NULL, addr, *pte); 89} 90 91static void clear_pte_phys(unsigned long addr, pgprot_t prot) 92{ 93 pte_t *pte; 94 95 pte = __get_pte_phys(addr); 96 97 if (pgprot_val(prot) & _PAGE_WIRED) 98 tlb_unwire_entry(); 99 100 set_pte(pte, pfn_pte(0, __pgprot(0))); 101 local_flush_tlb_one(get_asid(), addr); 102} 103 104void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 105{ 106 unsigned long address = __fix_to_virt(idx); 107 108 if (idx >= __end_of_fixed_addresses) { 109 BUG(); 110 return; 111 } 112 113 set_pte_phys(address, phys, prot); 114} 115 116void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 117{ 118 unsigned long address = __fix_to_virt(idx); 119 120 if (idx >= __end_of_fixed_addresses) { 121 BUG(); 122 return; 123 } 124 125 clear_pte_phys(address, prot); 126} 127 128void __init page_table_range_init(unsigned long start, unsigned long end, 129 pgd_t *pgd_base) 130{ 131 pgd_t *pgd; 132 pud_t *pud; 133 pmd_t *pmd; 134 pte_t *pte; 135 int i, j, k; 136 unsigned long vaddr; 137 138 vaddr = start; 139 i = __pgd_offset(vaddr); 140 j = __pud_offset(vaddr); 141 k = __pmd_offset(vaddr); 142 pgd = pgd_base + i; 143 144 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 145 pud = (pud_t *)pgd; 146 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 147#ifdef __PAGETABLE_PMD_FOLDED 148 pmd = (pmd_t *)pud; 149#else 150 pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); 151 pud_populate(&init_mm, pud, pmd); 152 pmd += k; 153#endif 154 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 155 if (pmd_none(*pmd)) { 156 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 157 pmd_populate_kernel(&init_mm, pmd, pte); 158 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 159 } 160 vaddr += PMD_SIZE; 161 } 162 k = 0; 163 } 164 j = 0; 165 } 166} 167#endif /* CONFIG_MMU */ 168 169void __init allocate_pgdat(unsigned int nid) 170{ 171 unsigned long start_pfn, end_pfn; 172#ifdef CONFIG_NEED_MULTIPLE_NODES 173 unsigned long phys; 174#endif 175 176 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 177 178#ifdef CONFIG_NEED_MULTIPLE_NODES 179 phys = __memblock_alloc_base(sizeof(struct pglist_data), 180 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT); 181 /* Retry with all of system memory */ 182 if (!phys) 183 phys = __memblock_alloc_base(sizeof(struct pglist_data), 184 SMP_CACHE_BYTES, memblock_end_of_DRAM()); 185 if (!phys) 186 panic("Can't allocate pgdat for node %d\n", nid); 187 188 NODE_DATA(nid) = __va(phys); 189 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); 190 191 NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; 192#endif 193 194 NODE_DATA(nid)->node_start_pfn = start_pfn; 195 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 196} 197 198static void __init bootmem_init_one_node(unsigned int nid) 199{ 200 unsigned long total_pages, paddr; 201 unsigned long end_pfn; 202 struct pglist_data *p; 203 int i; 204 205 p = NODE_DATA(nid); 206 207 /* Nothing to do.. */ 208 if (!p->node_spanned_pages) 209 return; 210 211 end_pfn = p->node_start_pfn + p->node_spanned_pages; 212 213 total_pages = bootmem_bootmap_pages(p->node_spanned_pages); 214 215 paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE); 216 if (!paddr) 217 panic("Can't allocate bootmap for nid[%d]\n", nid); 218 219 init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn); 220 221 free_bootmem_with_active_regions(nid, end_pfn); 222 223 if (nid == 0) { 224 /* Reserve the sections we're already using. */ 225 for (i = 0; i < memblock.reserved.cnt; i++) 226 reserve_bootmem(memblock.reserved.region[i].base, 227 memblock_size_bytes(&memblock.reserved, i), 228 BOOTMEM_DEFAULT); 229 } 230 231 sparse_memory_present_with_active_regions(nid); 232} 233 234static void __init do_init_bootmem(void) 235{ 236 int i; 237 238 /* Add active regions with valid PFNs. */ 239 for (i = 0; i < memblock.memory.cnt; i++) { 240 unsigned long start_pfn, end_pfn; 241 start_pfn = memblock.memory.region[i].base >> PAGE_SHIFT; 242 end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i); 243 __add_active_range(0, start_pfn, end_pfn); 244 } 245 246 /* All of system RAM sits in node 0 for the non-NUMA case */ 247 allocate_pgdat(0); 248 node_set_online(0); 249 250 plat_mem_setup(); 251 252 for_each_online_node(i) 253 bootmem_init_one_node(i); 254 255 sparse_init(); 256} 257 258static void __init early_reserve_mem(void) 259{ 260 unsigned long start_pfn; 261 262 /* 263 * Partially used pages are not usable - thus 264 * we are rounding upwards: 265 */ 266 start_pfn = PFN_UP(__pa(_end)); 267 268 /* 269 * Reserve the kernel text and Reserve the bootmem bitmap. We do 270 * this in two steps (first step was init_bootmem()), because 271 * this catches the (definitely buggy) case of us accidentally 272 * initializing the bootmem allocator with an invalid RAM area. 273 */ 274 memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET, 275 (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - 276 (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET)); 277 278 /* 279 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 280 */ 281 if (CONFIG_ZERO_PAGE_OFFSET != 0) 282 memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET); 283 284 /* 285 * Handle additional early reservations 286 */ 287 check_for_initrd(); 288 reserve_crashkernel(); 289} 290 291void __init paging_init(void) 292{ 293 unsigned long max_zone_pfns[MAX_NR_ZONES]; 294 unsigned long vaddr, end; 295 int nid; 296 297 memblock_init(); 298 299 sh_mv.mv_mem_init(); 300 301 early_reserve_mem(); 302 303 memblock_enforce_memory_limit(memory_limit); 304 memblock_analyze(); 305 306 memblock_dump_all(); 307 308 /* 309 * Determine low and high memory ranges: 310 */ 311 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 312 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 313 314 nodes_clear(node_online_map); 315 316 memory_start = (unsigned long)__va(__MEMORY_START); 317 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 318 319 uncached_init(); 320 pmb_init(); 321 do_init_bootmem(); 322 ioremap_fixed_init(); 323 324 /* We don't need to map the kernel through the TLB, as 325 * it is permanatly mapped using P1. So clear the 326 * entire pgd. */ 327 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 328 329 /* Set an initial value for the MMU.TTB so we don't have to 330 * check for a null value. */ 331 set_TTB(swapper_pg_dir); 332 333 /* 334 * Populate the relevant portions of swapper_pg_dir so that 335 * we can use the fixmap entries without calling kmalloc. 336 * pte's will be filled in by __set_fixmap(). 337 */ 338 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 339 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 340 page_table_range_init(vaddr, end, swapper_pg_dir); 341 342 kmap_coherent_init(); 343 344 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 345 346 for_each_online_node(nid) { 347 pg_data_t *pgdat = NODE_DATA(nid); 348 unsigned long low, start_pfn; 349 350 start_pfn = pgdat->bdata->node_min_pfn; 351 low = pgdat->bdata->node_low_pfn; 352 353 if (max_zone_pfns[ZONE_NORMAL] < low) 354 max_zone_pfns[ZONE_NORMAL] = low; 355 356 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", 357 nid, start_pfn, low); 358 } 359 360 free_area_init_nodes(max_zone_pfns); 361} 362 363/* 364 * Early initialization for any I/O MMUs we might have. 365 */ 366static void __init iommu_init(void) 367{ 368 no_iommu_init(); 369} 370 371unsigned int mem_init_done = 0; 372 373void __init mem_init(void) 374{ 375 int codesize, datasize, initsize; 376 int nid; 377 378 iommu_init(); 379 380 num_physpages = 0; 381 high_memory = NULL; 382 383 for_each_online_node(nid) { 384 pg_data_t *pgdat = NODE_DATA(nid); 385 unsigned long node_pages = 0; 386 void *node_high_memory; 387 388 num_physpages += pgdat->node_present_pages; 389 390 if (pgdat->node_spanned_pages) 391 node_pages = free_all_bootmem_node(pgdat); 392 393 totalram_pages += node_pages; 394 395 node_high_memory = (void *)__va((pgdat->node_start_pfn + 396 pgdat->node_spanned_pages) << 397 PAGE_SHIFT); 398 if (node_high_memory > high_memory) 399 high_memory = node_high_memory; 400 } 401 402 /* Set this up early, so we can take care of the zero page */ 403 cpu_cache_init(); 404 405 /* clear the zero-page */ 406 memset(empty_zero_page, 0, PAGE_SIZE); 407 __flush_wback_region(empty_zero_page, PAGE_SIZE); 408 409 vsyscall_init(); 410 411 codesize = (unsigned long) &_etext - (unsigned long) &_text; 412 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 413 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 414 415 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " 416 "%dk data, %dk init)\n", 417 nr_free_pages() << (PAGE_SHIFT-10), 418 num_physpages << (PAGE_SHIFT-10), 419 codesize >> 10, 420 datasize >> 10, 421 initsize >> 10); 422 423 printk(KERN_INFO "virtual kernel memory layout:\n" 424 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 425#ifdef CONFIG_HIGHMEM 426 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 427#endif 428 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 429 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 430#ifdef CONFIG_UNCACHED_MAPPING 431 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 432#endif 433 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 434 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 435 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 436 FIXADDR_START, FIXADDR_TOP, 437 (FIXADDR_TOP - FIXADDR_START) >> 10, 438 439#ifdef CONFIG_HIGHMEM 440 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 441 (LAST_PKMAP*PAGE_SIZE) >> 10, 442#endif 443 444 (unsigned long)VMALLOC_START, VMALLOC_END, 445 (VMALLOC_END - VMALLOC_START) >> 20, 446 447 (unsigned long)memory_start, (unsigned long)high_memory, 448 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 449 450#ifdef CONFIG_UNCACHED_MAPPING 451 uncached_start, uncached_end, uncached_size >> 20, 452#endif 453 454 (unsigned long)&__init_begin, (unsigned long)&__init_end, 455 ((unsigned long)&__init_end - 456 (unsigned long)&__init_begin) >> 10, 457 458 (unsigned long)&_etext, (unsigned long)&_edata, 459 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 460 461 (unsigned long)&_text, (unsigned long)&_etext, 462 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 463 464 mem_init_done = 1; 465} 466 467void free_initmem(void) 468{ 469 unsigned long addr; 470 471 addr = (unsigned long)(&__init_begin); 472 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 473 ClearPageReserved(virt_to_page(addr)); 474 init_page_count(virt_to_page(addr)); 475 free_page(addr); 476 totalram_pages++; 477 } 478 printk("Freeing unused kernel memory: %ldk freed\n", 479 ((unsigned long)&__init_end - 480 (unsigned long)&__init_begin) >> 10); 481} 482 483#ifdef CONFIG_BLK_DEV_INITRD 484void free_initrd_mem(unsigned long start, unsigned long end) 485{ 486 unsigned long p; 487 for (p = start; p < end; p += PAGE_SIZE) { 488 ClearPageReserved(virt_to_page(p)); 489 init_page_count(virt_to_page(p)); 490 free_page(p); 491 totalram_pages++; 492 } 493 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 494} 495#endif 496 497#ifdef CONFIG_MEMORY_HOTPLUG 498int arch_add_memory(int nid, u64 start, u64 size) 499{ 500 pg_data_t *pgdat; 501 unsigned long start_pfn = start >> PAGE_SHIFT; 502 unsigned long nr_pages = size >> PAGE_SHIFT; 503 int ret; 504 505 pgdat = NODE_DATA(nid); 506 507 /* We only have ZONE_NORMAL, so this is easy.. */ 508 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL, 509 start_pfn, nr_pages); 510 if (unlikely(ret)) 511 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 512 513 return ret; 514} 515EXPORT_SYMBOL_GPL(arch_add_memory); 516 517#ifdef CONFIG_NUMA 518int memory_add_physaddr_to_nid(u64 addr) 519{ 520 /* Node 0 for now.. */ 521 return 0; 522} 523EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 524#endif 525 526#endif /* CONFIG_MEMORY_HOTPLUG */ 527