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/memblock.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/dma-mapping.h> 20 #include <linux/export.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 = memblock_alloc(PAGE_SIZE, 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 = memblock_alloc(PAGE_SIZE, 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 #endif 214 215 NODE_DATA(nid)->node_start_pfn = start_pfn; 216 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 217 } 218 219 static void __init do_init_bootmem(void) 220 { 221 struct memblock_region *reg; 222 223 /* Add active regions with valid PFNs. */ 224 for_each_memblock(memory, reg) { 225 unsigned long start_pfn, end_pfn; 226 start_pfn = memblock_region_memory_base_pfn(reg); 227 end_pfn = memblock_region_memory_end_pfn(reg); 228 __add_active_range(0, start_pfn, end_pfn); 229 } 230 231 /* All of system RAM sits in node 0 for the non-NUMA case */ 232 allocate_pgdat(0); 233 node_set_online(0); 234 235 plat_mem_setup(); 236 237 for_each_memblock(memory, reg) { 238 int nid = memblock_get_region_node(reg); 239 240 memory_present(nid, memblock_region_memory_base_pfn(reg), 241 memblock_region_memory_end_pfn(reg)); 242 } 243 sparse_init(); 244 } 245 246 static void __init early_reserve_mem(void) 247 { 248 unsigned long start_pfn; 249 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 250 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 251 252 /* 253 * Partially used pages are not usable - thus 254 * we are rounding upwards: 255 */ 256 start_pfn = PFN_UP(__pa(_end)); 257 258 /* 259 * Reserve the kernel text and Reserve the bootmem bitmap. We do 260 * this in two steps (first step was init_bootmem()), because 261 * this catches the (definitely buggy) case of us accidentally 262 * initializing the bootmem allocator with an invalid RAM area. 263 */ 264 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 265 266 /* 267 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 268 */ 269 if (CONFIG_ZERO_PAGE_OFFSET != 0) 270 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 271 272 /* 273 * Handle additional early reservations 274 */ 275 check_for_initrd(); 276 reserve_crashkernel(); 277 } 278 279 void __init paging_init(void) 280 { 281 unsigned long max_zone_pfns[MAX_NR_ZONES]; 282 unsigned long vaddr, end; 283 284 sh_mv.mv_mem_init(); 285 286 early_reserve_mem(); 287 288 /* 289 * Once the early reservations are out of the way, give the 290 * platforms a chance to kick out some memory. 291 */ 292 if (sh_mv.mv_mem_reserve) 293 sh_mv.mv_mem_reserve(); 294 295 memblock_enforce_memory_limit(memory_limit); 296 memblock_allow_resize(); 297 298 memblock_dump_all(); 299 300 /* 301 * Determine low and high memory ranges: 302 */ 303 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 304 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 305 306 nodes_clear(node_online_map); 307 308 memory_start = (unsigned long)__va(__MEMORY_START); 309 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 310 311 uncached_init(); 312 pmb_init(); 313 do_init_bootmem(); 314 ioremap_fixed_init(); 315 316 /* We don't need to map the kernel through the TLB, as 317 * it is permanatly mapped using P1. So clear the 318 * entire pgd. */ 319 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 320 321 /* Set an initial value for the MMU.TTB so we don't have to 322 * check for a null value. */ 323 set_TTB(swapper_pg_dir); 324 325 /* 326 * Populate the relevant portions of swapper_pg_dir so that 327 * we can use the fixmap entries without calling kmalloc. 328 * pte's will be filled in by __set_fixmap(). 329 */ 330 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 331 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 332 page_table_range_init(vaddr, end, swapper_pg_dir); 333 334 kmap_coherent_init(); 335 336 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 337 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 338 free_area_init_nodes(max_zone_pfns); 339 } 340 341 unsigned int mem_init_done = 0; 342 343 void __init mem_init(void) 344 { 345 pg_data_t *pgdat; 346 347 high_memory = NULL; 348 for_each_online_pgdat(pgdat) 349 high_memory = max_t(void *, high_memory, 350 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 351 352 memblock_free_all(); 353 354 /* Set this up early, so we can take care of the zero page */ 355 cpu_cache_init(); 356 357 /* clear the zero-page */ 358 memset(empty_zero_page, 0, PAGE_SIZE); 359 __flush_wback_region(empty_zero_page, PAGE_SIZE); 360 361 vsyscall_init(); 362 363 mem_init_print_info(NULL); 364 pr_info("virtual kernel memory layout:\n" 365 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 366 #ifdef CONFIG_HIGHMEM 367 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 368 #endif 369 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 370 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 371 #ifdef CONFIG_UNCACHED_MAPPING 372 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 373 #endif 374 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 375 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 376 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 377 FIXADDR_START, FIXADDR_TOP, 378 (FIXADDR_TOP - FIXADDR_START) >> 10, 379 380 #ifdef CONFIG_HIGHMEM 381 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 382 (LAST_PKMAP*PAGE_SIZE) >> 10, 383 #endif 384 385 (unsigned long)VMALLOC_START, VMALLOC_END, 386 (VMALLOC_END - VMALLOC_START) >> 20, 387 388 (unsigned long)memory_start, (unsigned long)high_memory, 389 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 390 391 #ifdef CONFIG_UNCACHED_MAPPING 392 uncached_start, uncached_end, uncached_size >> 20, 393 #endif 394 395 (unsigned long)&__init_begin, (unsigned long)&__init_end, 396 ((unsigned long)&__init_end - 397 (unsigned long)&__init_begin) >> 10, 398 399 (unsigned long)&_etext, (unsigned long)&_edata, 400 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 401 402 (unsigned long)&_text, (unsigned long)&_etext, 403 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 404 405 mem_init_done = 1; 406 } 407 408 void free_initmem(void) 409 { 410 free_initmem_default(-1); 411 } 412 413 #ifdef CONFIG_BLK_DEV_INITRD 414 void free_initrd_mem(unsigned long start, unsigned long end) 415 { 416 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 417 } 418 #endif 419 420 #ifdef CONFIG_MEMORY_HOTPLUG 421 int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, 422 bool want_memblock) 423 { 424 unsigned long start_pfn = PFN_DOWN(start); 425 unsigned long nr_pages = size >> PAGE_SHIFT; 426 int ret; 427 428 /* We only have ZONE_NORMAL, so this is easy.. */ 429 ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock); 430 if (unlikely(ret)) 431 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 432 433 return ret; 434 } 435 436 #ifdef CONFIG_NUMA 437 int memory_add_physaddr_to_nid(u64 addr) 438 { 439 /* Node 0 for now.. */ 440 return 0; 441 } 442 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 443 #endif 444 445 #ifdef CONFIG_MEMORY_HOTREMOVE 446 int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap) 447 { 448 unsigned long start_pfn = PFN_DOWN(start); 449 unsigned long nr_pages = size >> PAGE_SHIFT; 450 struct zone *zone; 451 int ret; 452 453 zone = page_zone(pfn_to_page(start_pfn)); 454 ret = __remove_pages(zone, start_pfn, nr_pages, altmap); 455 if (unlikely(ret)) 456 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__, 457 ret); 458 459 return ret; 460 } 461 #endif 462 #endif /* CONFIG_MEMORY_HOTPLUG */ 463