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 <linux/export.h> 22 #include <asm/mmu_context.h> 23 #include <asm/mmzone.h> 24 #include <asm/kexec.h> 25 #include <asm/tlb.h> 26 #include <asm/cacheflush.h> 27 #include <asm/sections.h> 28 #include <asm/setup.h> 29 #include <asm/cache.h> 30 #include <asm/sizes.h> 31 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 = pgdat_end_pfn(p); 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 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 292 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 293 294 /* 295 * Partially used pages are not usable - thus 296 * we are rounding upwards: 297 */ 298 start_pfn = PFN_UP(__pa(_end)); 299 300 /* 301 * Reserve the kernel text and Reserve the bootmem bitmap. We do 302 * this in two steps (first step was init_bootmem()), because 303 * this catches the (definitely buggy) case of us accidentally 304 * initializing the bootmem allocator with an invalid RAM area. 305 */ 306 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 307 308 /* 309 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 310 */ 311 if (CONFIG_ZERO_PAGE_OFFSET != 0) 312 memblock_reserve(zero_base, 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 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_allow_resize(); 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 pg_data_t *pgdat; 411 412 iommu_init(); 413 414 high_memory = NULL; 415 for_each_online_pgdat(pgdat) 416 high_memory = max_t(void *, high_memory, 417 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 418 419 free_all_bootmem(); 420 421 /* Set this up early, so we can take care of the zero page */ 422 cpu_cache_init(); 423 424 /* clear the zero-page */ 425 memset(empty_zero_page, 0, PAGE_SIZE); 426 __flush_wback_region(empty_zero_page, PAGE_SIZE); 427 428 vsyscall_init(); 429 430 mem_init_print_info(NULL); 431 pr_info("virtual kernel memory layout:\n" 432 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 433 #ifdef CONFIG_HIGHMEM 434 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 435 #endif 436 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 437 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 438 #ifdef CONFIG_UNCACHED_MAPPING 439 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 440 #endif 441 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 442 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 443 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 444 FIXADDR_START, FIXADDR_TOP, 445 (FIXADDR_TOP - FIXADDR_START) >> 10, 446 447 #ifdef CONFIG_HIGHMEM 448 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 449 (LAST_PKMAP*PAGE_SIZE) >> 10, 450 #endif 451 452 (unsigned long)VMALLOC_START, VMALLOC_END, 453 (VMALLOC_END - VMALLOC_START) >> 20, 454 455 (unsigned long)memory_start, (unsigned long)high_memory, 456 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 457 458 #ifdef CONFIG_UNCACHED_MAPPING 459 uncached_start, uncached_end, uncached_size >> 20, 460 #endif 461 462 (unsigned long)&__init_begin, (unsigned long)&__init_end, 463 ((unsigned long)&__init_end - 464 (unsigned long)&__init_begin) >> 10, 465 466 (unsigned long)&_etext, (unsigned long)&_edata, 467 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 468 469 (unsigned long)&_text, (unsigned long)&_etext, 470 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 471 472 mem_init_done = 1; 473 } 474 475 void free_initmem(void) 476 { 477 free_initmem_default(-1); 478 } 479 480 #ifdef CONFIG_BLK_DEV_INITRD 481 void free_initrd_mem(unsigned long start, unsigned long end) 482 { 483 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 484 } 485 #endif 486 487 #ifdef CONFIG_MEMORY_HOTPLUG 488 int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock) 489 { 490 unsigned long start_pfn = PFN_DOWN(start); 491 unsigned long nr_pages = size >> PAGE_SHIFT; 492 int ret; 493 494 /* We only have ZONE_NORMAL, so this is easy.. */ 495 ret = __add_pages(nid, start_pfn, nr_pages, want_memblock); 496 if (unlikely(ret)) 497 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 498 499 return ret; 500 } 501 EXPORT_SYMBOL_GPL(arch_add_memory); 502 503 #ifdef CONFIG_NUMA 504 int memory_add_physaddr_to_nid(u64 addr) 505 { 506 /* Node 0 for now.. */ 507 return 0; 508 } 509 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 510 #endif 511 512 #ifdef CONFIG_MEMORY_HOTREMOVE 513 int arch_remove_memory(u64 start, u64 size) 514 { 515 unsigned long start_pfn = PFN_DOWN(start); 516 unsigned long nr_pages = size >> PAGE_SHIFT; 517 struct zone *zone; 518 int ret; 519 520 zone = page_zone(pfn_to_page(start_pfn)); 521 ret = __remove_pages(zone, start_pfn, nr_pages); 522 if (unlikely(ret)) 523 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__, 524 ret); 525 526 return ret; 527 } 528 #endif 529 #endif /* CONFIG_MEMORY_HOTPLUG */ 530