1 /* 2 * linux/arch/sh/mm/init.c 3 * 4 * Copyright (C) 1999 Niibe Yutaka 5 * Copyright (C) 2002 - 2007 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/bootmem.h> 14 #include <linux/proc_fs.h> 15 #include <linux/pagemap.h> 16 #include <linux/percpu.h> 17 #include <linux/io.h> 18 #include <linux/dma-mapping.h> 19 #include <asm/mmu_context.h> 20 #include <asm/tlb.h> 21 #include <asm/cacheflush.h> 22 #include <asm/sections.h> 23 #include <asm/cache.h> 24 25 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 26 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 27 28 #ifdef CONFIG_SUPERH32 29 /* 30 * This is the offset of the uncached section from its cached alias. 31 * 32 * Legacy platforms handle trivial transitions between cached and 33 * uncached segments by making use of the 1:1 mapping relationship in 34 * 512MB lowmem, others via a special uncached mapping. 35 * 36 * Default value only valid in 29 bit mode, in 32bit mode this will be 37 * updated by the early PMB initialization code. 38 */ 39 unsigned long cached_to_uncached = P2SEG - P1SEG; 40 unsigned long uncached_size = 0x20000000; 41 #endif 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 pte_t *pte; 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 pte = pte_offset_kernel(pmd, addr); 70 return pte; 71 } 72 73 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 74 { 75 pte_t *pte; 76 77 pte = __get_pte_phys(addr); 78 if (!pte_none(*pte)) { 79 pte_ERROR(*pte); 80 return; 81 } 82 83 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 84 local_flush_tlb_one(get_asid(), addr); 85 86 if (pgprot_val(prot) & _PAGE_WIRED) 87 tlb_wire_entry(NULL, addr, *pte); 88 } 89 90 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 91 { 92 pte_t *pte; 93 94 pte = __get_pte_phys(addr); 95 96 if (pgprot_val(prot) & _PAGE_WIRED) 97 tlb_unwire_entry(); 98 99 set_pte(pte, pfn_pte(0, __pgprot(0))); 100 local_flush_tlb_one(get_asid(), addr); 101 } 102 103 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 104 { 105 unsigned long address = __fix_to_virt(idx); 106 107 if (idx >= __end_of_fixed_addresses) { 108 BUG(); 109 return; 110 } 111 112 set_pte_phys(address, phys, prot); 113 } 114 115 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 116 { 117 unsigned long address = __fix_to_virt(idx); 118 119 if (idx >= __end_of_fixed_addresses) { 120 BUG(); 121 return; 122 } 123 124 clear_pte_phys(address, prot); 125 } 126 127 void __init page_table_range_init(unsigned long start, unsigned long end, 128 pgd_t *pgd_base) 129 { 130 pgd_t *pgd; 131 pud_t *pud; 132 pmd_t *pmd; 133 pte_t *pte; 134 int i, j, k; 135 unsigned long vaddr; 136 137 vaddr = start; 138 i = __pgd_offset(vaddr); 139 j = __pud_offset(vaddr); 140 k = __pmd_offset(vaddr); 141 pgd = pgd_base + i; 142 143 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 144 pud = (pud_t *)pgd; 145 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 146 #ifdef __PAGETABLE_PMD_FOLDED 147 pmd = (pmd_t *)pud; 148 #else 149 pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); 150 pud_populate(&init_mm, pud, pmd); 151 pmd += k; 152 #endif 153 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 154 if (pmd_none(*pmd)) { 155 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 156 pmd_populate_kernel(&init_mm, pmd, pte); 157 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 158 } 159 vaddr += PMD_SIZE; 160 } 161 k = 0; 162 } 163 j = 0; 164 } 165 } 166 #endif /* CONFIG_MMU */ 167 168 /* 169 * paging_init() sets up the page tables 170 */ 171 void __init paging_init(void) 172 { 173 unsigned long max_zone_pfns[MAX_NR_ZONES]; 174 unsigned long vaddr, end; 175 int nid; 176 177 /* We don't need to map the kernel through the TLB, as 178 * it is permanatly mapped using P1. So clear the 179 * entire pgd. */ 180 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 181 182 /* Set an initial value for the MMU.TTB so we don't have to 183 * check for a null value. */ 184 set_TTB(swapper_pg_dir); 185 186 /* 187 * Populate the relevant portions of swapper_pg_dir so that 188 * we can use the fixmap entries without calling kmalloc. 189 * pte's will be filled in by __set_fixmap(). 190 */ 191 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 192 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 193 page_table_range_init(vaddr, end, swapper_pg_dir); 194 195 kmap_coherent_init(); 196 197 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 198 199 for_each_online_node(nid) { 200 pg_data_t *pgdat = NODE_DATA(nid); 201 unsigned long low, start_pfn; 202 203 start_pfn = pgdat->bdata->node_min_pfn; 204 low = pgdat->bdata->node_low_pfn; 205 206 if (max_zone_pfns[ZONE_NORMAL] < low) 207 max_zone_pfns[ZONE_NORMAL] = low; 208 209 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", 210 nid, start_pfn, low); 211 } 212 213 free_area_init_nodes(max_zone_pfns); 214 } 215 216 /* 217 * Early initialization for any I/O MMUs we might have. 218 */ 219 static void __init iommu_init(void) 220 { 221 no_iommu_init(); 222 } 223 224 unsigned int mem_init_done = 0; 225 226 void __init mem_init(void) 227 { 228 int codesize, datasize, initsize; 229 int nid; 230 231 iommu_init(); 232 233 num_physpages = 0; 234 high_memory = NULL; 235 236 for_each_online_node(nid) { 237 pg_data_t *pgdat = NODE_DATA(nid); 238 unsigned long node_pages = 0; 239 void *node_high_memory; 240 241 num_physpages += pgdat->node_present_pages; 242 243 if (pgdat->node_spanned_pages) 244 node_pages = free_all_bootmem_node(pgdat); 245 246 totalram_pages += node_pages; 247 248 node_high_memory = (void *)__va((pgdat->node_start_pfn + 249 pgdat->node_spanned_pages) << 250 PAGE_SHIFT); 251 if (node_high_memory > high_memory) 252 high_memory = node_high_memory; 253 } 254 255 /* Set this up early, so we can take care of the zero page */ 256 cpu_cache_init(); 257 258 /* clear the zero-page */ 259 memset(empty_zero_page, 0, PAGE_SIZE); 260 __flush_wback_region(empty_zero_page, PAGE_SIZE); 261 262 /* Initialize the vDSO */ 263 vsyscall_init(); 264 265 codesize = (unsigned long) &_etext - (unsigned long) &_text; 266 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 267 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 268 269 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " 270 "%dk data, %dk init)\n", 271 nr_free_pages() << (PAGE_SHIFT-10), 272 num_physpages << (PAGE_SHIFT-10), 273 codesize >> 10, 274 datasize >> 10, 275 initsize >> 10); 276 277 printk(KERN_INFO "virtual kernel memory layout:\n" 278 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 279 #ifdef CONFIG_HIGHMEM 280 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 281 #endif 282 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 283 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 284 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 285 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 286 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 287 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 288 FIXADDR_START, FIXADDR_TOP, 289 (FIXADDR_TOP - FIXADDR_START) >> 10, 290 291 #ifdef CONFIG_HIGHMEM 292 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 293 (LAST_PKMAP*PAGE_SIZE) >> 10, 294 #endif 295 296 (unsigned long)VMALLOC_START, VMALLOC_END, 297 (VMALLOC_END - VMALLOC_START) >> 20, 298 299 (unsigned long)memory_start, (unsigned long)high_memory, 300 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 301 302 (unsigned long)memory_start + cached_to_uncached, 303 (unsigned long)memory_start + cached_to_uncached + uncached_size, 304 uncached_size >> 20, 305 306 (unsigned long)&__init_begin, (unsigned long)&__init_end, 307 ((unsigned long)&__init_end - 308 (unsigned long)&__init_begin) >> 10, 309 310 (unsigned long)&_etext, (unsigned long)&_edata, 311 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 312 313 (unsigned long)&_text, (unsigned long)&_etext, 314 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 315 316 mem_init_done = 1; 317 } 318 319 void free_initmem(void) 320 { 321 unsigned long addr; 322 323 addr = (unsigned long)(&__init_begin); 324 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 325 ClearPageReserved(virt_to_page(addr)); 326 init_page_count(virt_to_page(addr)); 327 free_page(addr); 328 totalram_pages++; 329 } 330 printk("Freeing unused kernel memory: %ldk freed\n", 331 ((unsigned long)&__init_end - 332 (unsigned long)&__init_begin) >> 10); 333 } 334 335 #ifdef CONFIG_BLK_DEV_INITRD 336 void free_initrd_mem(unsigned long start, unsigned long end) 337 { 338 unsigned long p; 339 for (p = start; p < end; p += PAGE_SIZE) { 340 ClearPageReserved(virt_to_page(p)); 341 init_page_count(virt_to_page(p)); 342 free_page(p); 343 totalram_pages++; 344 } 345 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 346 } 347 #endif 348 349 #ifdef CONFIG_MEMORY_HOTPLUG 350 int arch_add_memory(int nid, u64 start, u64 size) 351 { 352 pg_data_t *pgdat; 353 unsigned long start_pfn = start >> PAGE_SHIFT; 354 unsigned long nr_pages = size >> PAGE_SHIFT; 355 int ret; 356 357 pgdat = NODE_DATA(nid); 358 359 /* We only have ZONE_NORMAL, so this is easy.. */ 360 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL, 361 start_pfn, nr_pages); 362 if (unlikely(ret)) 363 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 364 365 return ret; 366 } 367 EXPORT_SYMBOL_GPL(arch_add_memory); 368 369 #ifdef CONFIG_NUMA 370 int memory_add_physaddr_to_nid(u64 addr) 371 { 372 /* Node 0 for now.. */ 373 return 0; 374 } 375 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 376 #endif 377 378 #endif /* CONFIG_MEMORY_HOTPLUG */ 379