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 <linux/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 if (!pmd) 132 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 133 __func__, PAGE_SIZE, PAGE_SIZE); 134 pud_populate(&init_mm, pud, pmd); 135 BUG_ON(pmd != pmd_offset(pud, 0)); 136 } 137 138 return pmd_offset(pud, 0); 139 } 140 141 static pte_t * __init one_page_table_init(pmd_t *pmd) 142 { 143 if (pmd_none(*pmd)) { 144 pte_t *pte; 145 146 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 147 if (!pte) 148 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 149 __func__, PAGE_SIZE, PAGE_SIZE); 150 pmd_populate_kernel(&init_mm, pmd, pte); 151 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 152 } 153 154 return pte_offset_kernel(pmd, 0); 155 } 156 157 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 158 unsigned long vaddr, pte_t *lastpte) 159 { 160 return pte; 161 } 162 163 void __init page_table_range_init(unsigned long start, unsigned long end, 164 pgd_t *pgd_base) 165 { 166 pgd_t *pgd; 167 pud_t *pud; 168 pmd_t *pmd; 169 pte_t *pte = NULL; 170 int i, j, k; 171 unsigned long vaddr; 172 173 vaddr = start; 174 i = __pgd_offset(vaddr); 175 j = __pud_offset(vaddr); 176 k = __pmd_offset(vaddr); 177 pgd = pgd_base + i; 178 179 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 180 pud = (pud_t *)pgd; 181 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 182 pmd = one_md_table_init(pud); 183 #ifndef __PAGETABLE_PMD_FOLDED 184 pmd += k; 185 #endif 186 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 187 pte = page_table_kmap_check(one_page_table_init(pmd), 188 pmd, vaddr, pte); 189 vaddr += PMD_SIZE; 190 } 191 k = 0; 192 } 193 j = 0; 194 } 195 } 196 #endif /* CONFIG_MMU */ 197 198 void __init allocate_pgdat(unsigned int nid) 199 { 200 unsigned long start_pfn, end_pfn; 201 202 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 203 204 #ifdef CONFIG_NEED_MULTIPLE_NODES 205 NODE_DATA(nid) = memblock_alloc_try_nid( 206 sizeof(struct pglist_data), 207 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT, 208 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 209 if (!NODE_DATA(nid)) 210 panic("Can't allocate pgdat for node %d\n", nid); 211 #endif 212 213 NODE_DATA(nid)->node_start_pfn = start_pfn; 214 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 215 } 216 217 static void __init do_init_bootmem(void) 218 { 219 struct memblock_region *reg; 220 221 /* Add active regions with valid PFNs. */ 222 for_each_memblock(memory, reg) { 223 unsigned long start_pfn, end_pfn; 224 start_pfn = memblock_region_memory_base_pfn(reg); 225 end_pfn = memblock_region_memory_end_pfn(reg); 226 __add_active_range(0, start_pfn, end_pfn); 227 } 228 229 /* All of system RAM sits in node 0 for the non-NUMA case */ 230 allocate_pgdat(0); 231 node_set_online(0); 232 233 plat_mem_setup(); 234 235 for_each_memblock(memory, reg) { 236 int nid = memblock_get_region_node(reg); 237 238 memory_present(nid, memblock_region_memory_base_pfn(reg), 239 memblock_region_memory_end_pfn(reg)); 240 } 241 sparse_init(); 242 } 243 244 static void __init early_reserve_mem(void) 245 { 246 unsigned long start_pfn; 247 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 248 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 249 250 /* 251 * Partially used pages are not usable - thus 252 * we are rounding upwards: 253 */ 254 start_pfn = PFN_UP(__pa(_end)); 255 256 /* 257 * Reserve the kernel text and Reserve the bootmem bitmap. We do 258 * this in two steps (first step was init_bootmem()), because 259 * this catches the (definitely buggy) case of us accidentally 260 * initializing the bootmem allocator with an invalid RAM area. 261 */ 262 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 263 264 /* 265 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 266 */ 267 if (CONFIG_ZERO_PAGE_OFFSET != 0) 268 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 269 270 /* 271 * Handle additional early reservations 272 */ 273 check_for_initrd(); 274 reserve_crashkernel(); 275 } 276 277 void __init paging_init(void) 278 { 279 unsigned long max_zone_pfns[MAX_NR_ZONES]; 280 unsigned long vaddr, end; 281 282 sh_mv.mv_mem_init(); 283 284 early_reserve_mem(); 285 286 /* 287 * Once the early reservations are out of the way, give the 288 * platforms a chance to kick out some memory. 289 */ 290 if (sh_mv.mv_mem_reserve) 291 sh_mv.mv_mem_reserve(); 292 293 memblock_enforce_memory_limit(memory_limit); 294 memblock_allow_resize(); 295 296 memblock_dump_all(); 297 298 /* 299 * Determine low and high memory ranges: 300 */ 301 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 302 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 303 304 nodes_clear(node_online_map); 305 306 memory_start = (unsigned long)__va(__MEMORY_START); 307 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 308 309 uncached_init(); 310 pmb_init(); 311 do_init_bootmem(); 312 ioremap_fixed_init(); 313 314 /* We don't need to map the kernel through the TLB, as 315 * it is permanatly mapped using P1. So clear the 316 * entire pgd. */ 317 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 318 319 /* Set an initial value for the MMU.TTB so we don't have to 320 * check for a null value. */ 321 set_TTB(swapper_pg_dir); 322 323 /* 324 * Populate the relevant portions of swapper_pg_dir so that 325 * we can use the fixmap entries without calling kmalloc. 326 * pte's will be filled in by __set_fixmap(). 327 */ 328 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 329 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 330 page_table_range_init(vaddr, end, swapper_pg_dir); 331 332 kmap_coherent_init(); 333 334 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 335 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 336 free_area_init_nodes(max_zone_pfns); 337 } 338 339 unsigned int mem_init_done = 0; 340 341 void __init mem_init(void) 342 { 343 pg_data_t *pgdat; 344 345 high_memory = NULL; 346 for_each_online_pgdat(pgdat) 347 high_memory = max_t(void *, high_memory, 348 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 349 350 memblock_free_all(); 351 352 /* Set this up early, so we can take care of the zero page */ 353 cpu_cache_init(); 354 355 /* clear the zero-page */ 356 memset(empty_zero_page, 0, PAGE_SIZE); 357 __flush_wback_region(empty_zero_page, PAGE_SIZE); 358 359 vsyscall_init(); 360 361 mem_init_print_info(NULL); 362 pr_info("virtual kernel memory layout:\n" 363 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 364 #ifdef CONFIG_HIGHMEM 365 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 366 #endif 367 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 368 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 369 #ifdef CONFIG_UNCACHED_MAPPING 370 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 371 #endif 372 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 373 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 374 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 375 FIXADDR_START, FIXADDR_TOP, 376 (FIXADDR_TOP - FIXADDR_START) >> 10, 377 378 #ifdef CONFIG_HIGHMEM 379 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 380 (LAST_PKMAP*PAGE_SIZE) >> 10, 381 #endif 382 383 (unsigned long)VMALLOC_START, VMALLOC_END, 384 (VMALLOC_END - VMALLOC_START) >> 20, 385 386 (unsigned long)memory_start, (unsigned long)high_memory, 387 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 388 389 #ifdef CONFIG_UNCACHED_MAPPING 390 uncached_start, uncached_end, uncached_size >> 20, 391 #endif 392 393 (unsigned long)&__init_begin, (unsigned long)&__init_end, 394 ((unsigned long)&__init_end - 395 (unsigned long)&__init_begin) >> 10, 396 397 (unsigned long)&_etext, (unsigned long)&_edata, 398 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 399 400 (unsigned long)&_text, (unsigned long)&_etext, 401 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 402 403 mem_init_done = 1; 404 } 405 406 #ifdef CONFIG_MEMORY_HOTPLUG 407 int arch_add_memory(int nid, u64 start, u64 size, 408 struct mhp_restrictions *restrictions) 409 { 410 unsigned long start_pfn = PFN_DOWN(start); 411 unsigned long nr_pages = size >> PAGE_SHIFT; 412 int ret; 413 414 /* We only have ZONE_NORMAL, so this is easy.. */ 415 ret = __add_pages(nid, start_pfn, nr_pages, restrictions); 416 if (unlikely(ret)) 417 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 418 419 return ret; 420 } 421 422 #ifdef CONFIG_NUMA 423 int memory_add_physaddr_to_nid(u64 addr) 424 { 425 /* Node 0 for now.. */ 426 return 0; 427 } 428 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 429 #endif 430 431 #ifdef CONFIG_MEMORY_HOTREMOVE 432 void arch_remove_memory(int nid, u64 start, u64 size, 433 struct vmem_altmap *altmap) 434 { 435 unsigned long start_pfn = PFN_DOWN(start); 436 unsigned long nr_pages = size >> PAGE_SHIFT; 437 struct zone *zone; 438 439 zone = page_zone(pfn_to_page(start_pfn)); 440 __remove_pages(zone, start_pfn, nr_pages, altmap); 441 } 442 #endif 443 #endif /* CONFIG_MEMORY_HOTPLUG */ 444