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 <asm/mmu_context.h> 19 #include <asm/tlb.h> 20 #include <asm/cacheflush.h> 21 #include <asm/sections.h> 22 #include <asm/cache.h> 23 24 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 25 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 26 unsigned long cached_to_uncached = 0; 27 28 void show_mem(void) 29 { 30 int total = 0, reserved = 0, free = 0; 31 int shared = 0, cached = 0, slab = 0; 32 pg_data_t *pgdat; 33 34 printk("Mem-info:\n"); 35 show_free_areas(); 36 37 for_each_online_pgdat(pgdat) { 38 unsigned long flags, i; 39 40 pgdat_resize_lock(pgdat, &flags); 41 for (i = 0; i < pgdat->node_spanned_pages; i++) { 42 struct page *page = pgdat_page_nr(pgdat, i); 43 total++; 44 if (PageReserved(page)) 45 reserved++; 46 else if (PageSwapCache(page)) 47 cached++; 48 else if (PageSlab(page)) 49 slab++; 50 else if (!page_count(page)) 51 free++; 52 else 53 shared += page_count(page) - 1; 54 } 55 pgdat_resize_unlock(pgdat, &flags); 56 } 57 58 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 59 printk("%d pages of RAM\n", total); 60 printk("%d free pages\n", free); 61 printk("%d reserved pages\n", reserved); 62 printk("%d slab pages\n", slab); 63 printk("%d pages shared\n", shared); 64 printk("%d pages swap cached\n", cached); 65 printk(KERN_INFO "Total of %ld pages in page table cache\n", 66 quicklist_total_size()); 67 } 68 69 #ifdef CONFIG_MMU 70 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 71 { 72 pgd_t *pgd; 73 pud_t *pud; 74 pmd_t *pmd; 75 pte_t *pte; 76 77 pgd = pgd_offset_k(addr); 78 if (pgd_none(*pgd)) { 79 pgd_ERROR(*pgd); 80 return; 81 } 82 83 pud = pud_alloc(NULL, pgd, addr); 84 if (unlikely(!pud)) { 85 pud_ERROR(*pud); 86 return; 87 } 88 89 pmd = pmd_alloc(NULL, pud, addr); 90 if (unlikely(!pmd)) { 91 pmd_ERROR(*pmd); 92 return; 93 } 94 95 pte = pte_offset_kernel(pmd, addr); 96 if (!pte_none(*pte)) { 97 pte_ERROR(*pte); 98 return; 99 } 100 101 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 102 103 if (cached_to_uncached) 104 flush_tlb_one(get_asid(), addr); 105 } 106 107 /* 108 * As a performance optimization, other platforms preserve the fixmap mapping 109 * across a context switch, we don't presently do this, but this could be done 110 * in a similar fashion as to the wired TLB interface that sh64 uses (by way 111 * of the memory mapped UTLB configuration) -- this unfortunately forces us to 112 * give up a TLB entry for each mapping we want to preserve. While this may be 113 * viable for a small number of fixmaps, it's not particularly useful for 114 * everything and needs to be carefully evaluated. (ie, we may want this for 115 * the vsyscall page). 116 * 117 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass 118 * in at __set_fixmap() time to determine the appropriate behavior to follow. 119 * 120 * -- PFM. 121 */ 122 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 123 { 124 unsigned long address = __fix_to_virt(idx); 125 126 if (idx >= __end_of_fixed_addresses) { 127 BUG(); 128 return; 129 } 130 131 set_pte_phys(address, phys, prot); 132 } 133 134 void __init page_table_range_init(unsigned long start, unsigned long end, 135 pgd_t *pgd_base) 136 { 137 pgd_t *pgd; 138 pud_t *pud; 139 pmd_t *pmd; 140 int pgd_idx; 141 unsigned long vaddr; 142 143 vaddr = start & PMD_MASK; 144 end = (end + PMD_SIZE - 1) & PMD_MASK; 145 pgd_idx = pgd_index(vaddr); 146 pgd = pgd_base + pgd_idx; 147 148 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { 149 BUG_ON(pgd_none(*pgd)); 150 pud = pud_offset(pgd, 0); 151 BUG_ON(pud_none(*pud)); 152 pmd = pmd_offset(pud, 0); 153 154 if (!pmd_present(*pmd)) { 155 pte_t *pte_table; 156 pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); 157 memset(pte_table, 0, PAGE_SIZE); 158 pmd_populate_kernel(&init_mm, pmd, pte_table); 159 } 160 161 vaddr += PMD_SIZE; 162 } 163 } 164 #endif /* CONFIG_MMU */ 165 166 /* 167 * paging_init() sets up the page tables 168 */ 169 void __init paging_init(void) 170 { 171 unsigned long max_zone_pfns[MAX_NR_ZONES]; 172 int nid; 173 174 /* We don't need to map the kernel through the TLB, as 175 * it is permanatly mapped using P1. So clear the 176 * entire pgd. */ 177 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 178 179 /* Set an initial value for the MMU.TTB so we don't have to 180 * check for a null value. */ 181 set_TTB(swapper_pg_dir); 182 183 /* Populate the relevant portions of swapper_pg_dir so that 184 * we can use the fixmap entries without calling kmalloc. 185 * pte's will be filled in by __set_fixmap(). */ 186 page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir); 187 188 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 189 190 for_each_online_node(nid) { 191 pg_data_t *pgdat = NODE_DATA(nid); 192 unsigned long low, start_pfn; 193 194 start_pfn = pgdat->bdata->node_min_pfn; 195 low = pgdat->bdata->node_low_pfn; 196 197 if (max_zone_pfns[ZONE_NORMAL] < low) 198 max_zone_pfns[ZONE_NORMAL] = low; 199 200 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", 201 nid, start_pfn, low); 202 } 203 204 free_area_init_nodes(max_zone_pfns); 205 206 #ifdef CONFIG_SUPERH32 207 /* Set up the uncached fixmap */ 208 set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start)); 209 210 #ifdef CONFIG_29BIT 211 /* 212 * Handle trivial transitions between cached and uncached 213 * segments, making use of the 1:1 mapping relationship in 214 * 512MB lowmem. 215 */ 216 cached_to_uncached = P2SEG - P1SEG; 217 #endif 218 #endif 219 } 220 221 static struct kcore_list kcore_mem, kcore_vmalloc; 222 int after_bootmem = 0; 223 224 void __init mem_init(void) 225 { 226 int codesize, datasize, initsize; 227 int nid; 228 229 num_physpages = 0; 230 high_memory = NULL; 231 232 for_each_online_node(nid) { 233 pg_data_t *pgdat = NODE_DATA(nid); 234 unsigned long node_pages = 0; 235 void *node_high_memory; 236 237 num_physpages += pgdat->node_present_pages; 238 239 if (pgdat->node_spanned_pages) 240 node_pages = free_all_bootmem_node(pgdat); 241 242 totalram_pages += node_pages; 243 244 node_high_memory = (void *)__va((pgdat->node_start_pfn + 245 pgdat->node_spanned_pages) << 246 PAGE_SHIFT); 247 if (node_high_memory > high_memory) 248 high_memory = node_high_memory; 249 } 250 251 /* clear the zero-page */ 252 memset(empty_zero_page, 0, PAGE_SIZE); 253 __flush_wback_region(empty_zero_page, PAGE_SIZE); 254 255 after_bootmem = 1; 256 257 codesize = (unsigned long) &_etext - (unsigned long) &_text; 258 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 259 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 260 261 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 262 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 263 VMALLOC_END - VMALLOC_START); 264 265 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " 266 "%dk data, %dk init)\n", 267 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 268 num_physpages << (PAGE_SHIFT-10), 269 codesize >> 10, 270 datasize >> 10, 271 initsize >> 10); 272 273 p3_cache_init(); 274 275 /* Initialize the vDSO */ 276 vsyscall_init(); 277 } 278 279 void free_initmem(void) 280 { 281 unsigned long addr; 282 283 addr = (unsigned long)(&__init_begin); 284 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 285 ClearPageReserved(virt_to_page(addr)); 286 init_page_count(virt_to_page(addr)); 287 free_page(addr); 288 totalram_pages++; 289 } 290 printk("Freeing unused kernel memory: %ldk freed\n", 291 ((unsigned long)&__init_end - 292 (unsigned long)&__init_begin) >> 10); 293 } 294 295 #ifdef CONFIG_BLK_DEV_INITRD 296 void free_initrd_mem(unsigned long start, unsigned long end) 297 { 298 unsigned long p; 299 for (p = start; p < end; p += PAGE_SIZE) { 300 ClearPageReserved(virt_to_page(p)); 301 init_page_count(virt_to_page(p)); 302 free_page(p); 303 totalram_pages++; 304 } 305 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 306 } 307 #endif 308 309 #ifdef CONFIG_MEMORY_HOTPLUG 310 int arch_add_memory(int nid, u64 start, u64 size) 311 { 312 pg_data_t *pgdat; 313 unsigned long start_pfn = start >> PAGE_SHIFT; 314 unsigned long nr_pages = size >> PAGE_SHIFT; 315 int ret; 316 317 pgdat = NODE_DATA(nid); 318 319 /* We only have ZONE_NORMAL, so this is easy.. */ 320 ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages); 321 if (unlikely(ret)) 322 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 323 324 return ret; 325 } 326 EXPORT_SYMBOL_GPL(arch_add_memory); 327 328 #ifdef CONFIG_NUMA 329 int memory_add_physaddr_to_nid(u64 addr) 330 { 331 /* Node 0 for now.. */ 332 return 0; 333 } 334 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 335 #endif 336 #endif 337