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 #endif 215 216 NODE_DATA(nid)->node_start_pfn = start_pfn; 217 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 218 } 219 220 static void __init do_init_bootmem(void) 221 { 222 struct memblock_region *reg; 223 224 /* Add active regions with valid PFNs. */ 225 for_each_memblock(memory, reg) { 226 unsigned long start_pfn, end_pfn; 227 start_pfn = memblock_region_memory_base_pfn(reg); 228 end_pfn = memblock_region_memory_end_pfn(reg); 229 __add_active_range(0, start_pfn, end_pfn); 230 } 231 232 /* All of system RAM sits in node 0 for the non-NUMA case */ 233 allocate_pgdat(0); 234 node_set_online(0); 235 236 plat_mem_setup(); 237 238 for_each_memblock(memory, reg) { 239 int nid = memblock_get_region_node(reg); 240 241 memory_present(nid, memblock_region_memory_base_pfn(reg), 242 memblock_region_memory_end_pfn(reg)); 243 } 244 sparse_init(); 245 } 246 247 static void __init early_reserve_mem(void) 248 { 249 unsigned long start_pfn; 250 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 251 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 252 253 /* 254 * Partially used pages are not usable - thus 255 * we are rounding upwards: 256 */ 257 start_pfn = PFN_UP(__pa(_end)); 258 259 /* 260 * Reserve the kernel text and Reserve the bootmem bitmap. We do 261 * this in two steps (first step was init_bootmem()), because 262 * this catches the (definitely buggy) case of us accidentally 263 * initializing the bootmem allocator with an invalid RAM area. 264 */ 265 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 266 267 /* 268 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 269 */ 270 if (CONFIG_ZERO_PAGE_OFFSET != 0) 271 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 272 273 /* 274 * Handle additional early reservations 275 */ 276 check_for_initrd(); 277 reserve_crashkernel(); 278 } 279 280 void __init paging_init(void) 281 { 282 unsigned long max_zone_pfns[MAX_NR_ZONES]; 283 unsigned long vaddr, end; 284 285 sh_mv.mv_mem_init(); 286 287 early_reserve_mem(); 288 289 /* 290 * Once the early reservations are out of the way, give the 291 * platforms a chance to kick out some memory. 292 */ 293 if (sh_mv.mv_mem_reserve) 294 sh_mv.mv_mem_reserve(); 295 296 memblock_enforce_memory_limit(memory_limit); 297 memblock_allow_resize(); 298 299 memblock_dump_all(); 300 301 /* 302 * Determine low and high memory ranges: 303 */ 304 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 305 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 306 307 nodes_clear(node_online_map); 308 309 memory_start = (unsigned long)__va(__MEMORY_START); 310 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 311 312 uncached_init(); 313 pmb_init(); 314 do_init_bootmem(); 315 ioremap_fixed_init(); 316 317 /* We don't need to map the kernel through the TLB, as 318 * it is permanatly mapped using P1. So clear the 319 * entire pgd. */ 320 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 321 322 /* Set an initial value for the MMU.TTB so we don't have to 323 * check for a null value. */ 324 set_TTB(swapper_pg_dir); 325 326 /* 327 * Populate the relevant portions of swapper_pg_dir so that 328 * we can use the fixmap entries without calling kmalloc. 329 * pte's will be filled in by __set_fixmap(). 330 */ 331 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 332 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 333 page_table_range_init(vaddr, end, swapper_pg_dir); 334 335 kmap_coherent_init(); 336 337 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 338 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 339 free_area_init_nodes(max_zone_pfns); 340 } 341 342 unsigned int mem_init_done = 0; 343 344 void __init mem_init(void) 345 { 346 pg_data_t *pgdat; 347 348 high_memory = NULL; 349 for_each_online_pgdat(pgdat) 350 high_memory = max_t(void *, high_memory, 351 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 352 353 free_all_bootmem(); 354 355 /* Set this up early, so we can take care of the zero page */ 356 cpu_cache_init(); 357 358 /* clear the zero-page */ 359 memset(empty_zero_page, 0, PAGE_SIZE); 360 __flush_wback_region(empty_zero_page, PAGE_SIZE); 361 362 vsyscall_init(); 363 364 mem_init_print_info(NULL); 365 pr_info("virtual kernel memory layout:\n" 366 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 367 #ifdef CONFIG_HIGHMEM 368 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 369 #endif 370 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 371 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 372 #ifdef CONFIG_UNCACHED_MAPPING 373 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 374 #endif 375 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 376 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 377 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 378 FIXADDR_START, FIXADDR_TOP, 379 (FIXADDR_TOP - FIXADDR_START) >> 10, 380 381 #ifdef CONFIG_HIGHMEM 382 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 383 (LAST_PKMAP*PAGE_SIZE) >> 10, 384 #endif 385 386 (unsigned long)VMALLOC_START, VMALLOC_END, 387 (VMALLOC_END - VMALLOC_START) >> 20, 388 389 (unsigned long)memory_start, (unsigned long)high_memory, 390 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 391 392 #ifdef CONFIG_UNCACHED_MAPPING 393 uncached_start, uncached_end, uncached_size >> 20, 394 #endif 395 396 (unsigned long)&__init_begin, (unsigned long)&__init_end, 397 ((unsigned long)&__init_end - 398 (unsigned long)&__init_begin) >> 10, 399 400 (unsigned long)&_etext, (unsigned long)&_edata, 401 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 402 403 (unsigned long)&_text, (unsigned long)&_etext, 404 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 405 406 mem_init_done = 1; 407 } 408 409 void free_initmem(void) 410 { 411 free_initmem_default(-1); 412 } 413 414 #ifdef CONFIG_BLK_DEV_INITRD 415 void free_initrd_mem(unsigned long start, unsigned long end) 416 { 417 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 418 } 419 #endif 420 421 #ifdef CONFIG_MEMORY_HOTPLUG 422 int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, 423 bool want_memblock) 424 { 425 unsigned long start_pfn = PFN_DOWN(start); 426 unsigned long nr_pages = size >> PAGE_SHIFT; 427 int ret; 428 429 /* We only have ZONE_NORMAL, so this is easy.. */ 430 ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); 431 if (unlikely(ret)) 432 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 433 434 return ret; 435 } 436 437 #ifdef CONFIG_NUMA 438 int memory_add_physaddr_to_nid(u64 addr) 439 { 440 /* Node 0 for now.. */ 441 return 0; 442 } 443 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 444 #endif 445 446 #ifdef CONFIG_MEMORY_HOTREMOVE 447 int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 448 { 449 unsigned long start_pfn = PFN_DOWN(start); 450 unsigned long nr_pages = size >> PAGE_SHIFT; 451 struct zone *zone; 452 int ret; 453 454 zone = page_zone(pfn_to_page(start_pfn)); 455 ret = __remove_pages(zone, start_pfn, nr_pages, altmap); 456 if (unlikely(ret)) 457 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__, 458 ret); 459 460 return ret; 461 } 462 #endif 463 #endif /* CONFIG_MEMORY_HOTPLUG */ 464