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 #include <asm/sizes.h> 25 26 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 27 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 28 29 #ifdef CONFIG_MMU 30 static pte_t *__get_pte_phys(unsigned long addr) 31 { 32 pgd_t *pgd; 33 pud_t *pud; 34 pmd_t *pmd; 35 pte_t *pte; 36 37 pgd = pgd_offset_k(addr); 38 if (pgd_none(*pgd)) { 39 pgd_ERROR(*pgd); 40 return NULL; 41 } 42 43 pud = pud_alloc(NULL, pgd, addr); 44 if (unlikely(!pud)) { 45 pud_ERROR(*pud); 46 return NULL; 47 } 48 49 pmd = pmd_alloc(NULL, pud, addr); 50 if (unlikely(!pmd)) { 51 pmd_ERROR(*pmd); 52 return NULL; 53 } 54 55 pte = pte_offset_kernel(pmd, addr); 56 return pte; 57 } 58 59 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 60 { 61 pte_t *pte; 62 63 pte = __get_pte_phys(addr); 64 if (!pte_none(*pte)) { 65 pte_ERROR(*pte); 66 return; 67 } 68 69 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 70 local_flush_tlb_one(get_asid(), addr); 71 72 if (pgprot_val(prot) & _PAGE_WIRED) 73 tlb_wire_entry(NULL, addr, *pte); 74 } 75 76 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 77 { 78 pte_t *pte; 79 80 pte = __get_pte_phys(addr); 81 82 if (pgprot_val(prot) & _PAGE_WIRED) 83 tlb_unwire_entry(); 84 85 set_pte(pte, pfn_pte(0, __pgprot(0))); 86 local_flush_tlb_one(get_asid(), addr); 87 } 88 89 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 90 { 91 unsigned long address = __fix_to_virt(idx); 92 93 if (idx >= __end_of_fixed_addresses) { 94 BUG(); 95 return; 96 } 97 98 set_pte_phys(address, phys, prot); 99 } 100 101 void __clear_fixmap(enum fixed_addresses idx, 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 clear_pte_phys(address, prot); 111 } 112 113 void __init page_table_range_init(unsigned long start, unsigned long end, 114 pgd_t *pgd_base) 115 { 116 pgd_t *pgd; 117 pud_t *pud; 118 pmd_t *pmd; 119 pte_t *pte; 120 int i, j, k; 121 unsigned long vaddr; 122 123 vaddr = start; 124 i = __pgd_offset(vaddr); 125 j = __pud_offset(vaddr); 126 k = __pmd_offset(vaddr); 127 pgd = pgd_base + i; 128 129 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 130 pud = (pud_t *)pgd; 131 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 132 #ifdef __PAGETABLE_PMD_FOLDED 133 pmd = (pmd_t *)pud; 134 #else 135 pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); 136 pud_populate(&init_mm, pud, pmd); 137 pmd += k; 138 #endif 139 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 140 if (pmd_none(*pmd)) { 141 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 142 pmd_populate_kernel(&init_mm, pmd, pte); 143 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 144 } 145 vaddr += PMD_SIZE; 146 } 147 k = 0; 148 } 149 j = 0; 150 } 151 } 152 #endif /* CONFIG_MMU */ 153 154 /* 155 * paging_init() sets up the page tables 156 */ 157 void __init paging_init(void) 158 { 159 unsigned long max_zone_pfns[MAX_NR_ZONES]; 160 unsigned long vaddr, end; 161 int nid; 162 163 /* We don't need to map the kernel through the TLB, as 164 * it is permanatly mapped using P1. So clear the 165 * entire pgd. */ 166 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 167 168 /* Set an initial value for the MMU.TTB so we don't have to 169 * check for a null value. */ 170 set_TTB(swapper_pg_dir); 171 172 /* 173 * Populate the relevant portions of swapper_pg_dir so that 174 * we can use the fixmap entries without calling kmalloc. 175 * pte's will be filled in by __set_fixmap(). 176 */ 177 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 178 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 179 page_table_range_init(vaddr, end, swapper_pg_dir); 180 181 kmap_coherent_init(); 182 183 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 184 185 for_each_online_node(nid) { 186 pg_data_t *pgdat = NODE_DATA(nid); 187 unsigned long low, start_pfn; 188 189 start_pfn = pgdat->bdata->node_min_pfn; 190 low = pgdat->bdata->node_low_pfn; 191 192 if (max_zone_pfns[ZONE_NORMAL] < low) 193 max_zone_pfns[ZONE_NORMAL] = low; 194 195 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", 196 nid, start_pfn, low); 197 } 198 199 free_area_init_nodes(max_zone_pfns); 200 } 201 202 /* 203 * Early initialization for any I/O MMUs we might have. 204 */ 205 static void __init iommu_init(void) 206 { 207 no_iommu_init(); 208 } 209 210 unsigned int mem_init_done = 0; 211 212 void __init mem_init(void) 213 { 214 int codesize, datasize, initsize; 215 int nid; 216 217 iommu_init(); 218 219 num_physpages = 0; 220 high_memory = NULL; 221 222 for_each_online_node(nid) { 223 pg_data_t *pgdat = NODE_DATA(nid); 224 unsigned long node_pages = 0; 225 void *node_high_memory; 226 227 num_physpages += pgdat->node_present_pages; 228 229 if (pgdat->node_spanned_pages) 230 node_pages = free_all_bootmem_node(pgdat); 231 232 totalram_pages += node_pages; 233 234 node_high_memory = (void *)__va((pgdat->node_start_pfn + 235 pgdat->node_spanned_pages) << 236 PAGE_SHIFT); 237 if (node_high_memory > high_memory) 238 high_memory = node_high_memory; 239 } 240 241 /* Set this up early, so we can take care of the zero page */ 242 cpu_cache_init(); 243 244 /* clear the zero-page */ 245 memset(empty_zero_page, 0, PAGE_SIZE); 246 __flush_wback_region(empty_zero_page, PAGE_SIZE); 247 248 vsyscall_init(); 249 250 codesize = (unsigned long) &_etext - (unsigned long) &_text; 251 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 252 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 253 254 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " 255 "%dk data, %dk init)\n", 256 nr_free_pages() << (PAGE_SHIFT-10), 257 num_physpages << (PAGE_SHIFT-10), 258 codesize >> 10, 259 datasize >> 10, 260 initsize >> 10); 261 262 printk(KERN_INFO "virtual kernel memory layout:\n" 263 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 264 #ifdef CONFIG_HIGHMEM 265 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 266 #endif 267 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 268 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 269 #ifdef CONFIG_UNCACHED_MAPPING 270 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 271 #endif 272 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 273 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 274 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 275 FIXADDR_START, FIXADDR_TOP, 276 (FIXADDR_TOP - FIXADDR_START) >> 10, 277 278 #ifdef CONFIG_HIGHMEM 279 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 280 (LAST_PKMAP*PAGE_SIZE) >> 10, 281 #endif 282 283 (unsigned long)VMALLOC_START, VMALLOC_END, 284 (VMALLOC_END - VMALLOC_START) >> 20, 285 286 (unsigned long)memory_start, (unsigned long)high_memory, 287 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 288 289 #ifdef CONFIG_UNCACHED_MAPPING 290 uncached_start, uncached_end, uncached_size >> 20, 291 #endif 292 293 (unsigned long)&__init_begin, (unsigned long)&__init_end, 294 ((unsigned long)&__init_end - 295 (unsigned long)&__init_begin) >> 10, 296 297 (unsigned long)&_etext, (unsigned long)&_edata, 298 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 299 300 (unsigned long)&_text, (unsigned long)&_etext, 301 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 302 303 mem_init_done = 1; 304 } 305 306 void free_initmem(void) 307 { 308 unsigned long addr; 309 310 addr = (unsigned long)(&__init_begin); 311 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 312 ClearPageReserved(virt_to_page(addr)); 313 init_page_count(virt_to_page(addr)); 314 free_page(addr); 315 totalram_pages++; 316 } 317 printk("Freeing unused kernel memory: %ldk freed\n", 318 ((unsigned long)&__init_end - 319 (unsigned long)&__init_begin) >> 10); 320 } 321 322 #ifdef CONFIG_BLK_DEV_INITRD 323 void free_initrd_mem(unsigned long start, unsigned long end) 324 { 325 unsigned long p; 326 for (p = start; p < end; p += PAGE_SIZE) { 327 ClearPageReserved(virt_to_page(p)); 328 init_page_count(virt_to_page(p)); 329 free_page(p); 330 totalram_pages++; 331 } 332 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 333 } 334 #endif 335 336 #ifdef CONFIG_MEMORY_HOTPLUG 337 int arch_add_memory(int nid, u64 start, u64 size) 338 { 339 pg_data_t *pgdat; 340 unsigned long start_pfn = start >> PAGE_SHIFT; 341 unsigned long nr_pages = size >> PAGE_SHIFT; 342 int ret; 343 344 pgdat = NODE_DATA(nid); 345 346 /* We only have ZONE_NORMAL, so this is easy.. */ 347 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL, 348 start_pfn, nr_pages); 349 if (unlikely(ret)) 350 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 351 352 return ret; 353 } 354 EXPORT_SYMBOL_GPL(arch_add_memory); 355 356 #ifdef CONFIG_NUMA 357 int memory_add_physaddr_to_nid(u64 addr) 358 { 359 /* Node 0 for now.. */ 360 return 0; 361 } 362 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 363 #endif 364 365 #endif /* CONFIG_MEMORY_HOTPLUG */ 366