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 27 void (*copy_page)(void *from, void *to); 28 void (*clear_page)(void *to); 29 30 void show_mem(void) 31 { 32 int total = 0, reserved = 0, free = 0; 33 int shared = 0, cached = 0, slab = 0; 34 pg_data_t *pgdat; 35 36 printk("Mem-info:\n"); 37 show_free_areas(); 38 39 for_each_online_pgdat(pgdat) { 40 unsigned long flags, i; 41 42 pgdat_resize_lock(pgdat, &flags); 43 for (i = 0; i < pgdat->node_spanned_pages; i++) { 44 struct page *page = pgdat_page_nr(pgdat, i); 45 total++; 46 if (PageReserved(page)) 47 reserved++; 48 else if (PageSwapCache(page)) 49 cached++; 50 else if (PageSlab(page)) 51 slab++; 52 else if (!page_count(page)) 53 free++; 54 else 55 shared += page_count(page) - 1; 56 } 57 pgdat_resize_unlock(pgdat, &flags); 58 } 59 60 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 61 printk("%d pages of RAM\n", total); 62 printk("%d free pages\n", free); 63 printk("%d reserved pages\n", reserved); 64 printk("%d slab pages\n", slab); 65 printk("%d pages shared\n", shared); 66 printk("%d pages swap cached\n", cached); 67 printk(KERN_INFO "Total of %ld pages in page table cache\n", 68 quicklist_total_size()); 69 } 70 71 #ifdef CONFIG_MMU 72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 73 { 74 pgd_t *pgd; 75 pud_t *pud; 76 pmd_t *pmd; 77 pte_t *pte; 78 79 pgd = pgd_offset_k(addr); 80 if (pgd_none(*pgd)) { 81 pgd_ERROR(*pgd); 82 return; 83 } 84 85 pud = pud_alloc(NULL, pgd, addr); 86 if (unlikely(!pud)) { 87 pud_ERROR(*pud); 88 return; 89 } 90 91 pmd = pmd_alloc(NULL, pud, addr); 92 if (unlikely(!pmd)) { 93 pmd_ERROR(*pmd); 94 return; 95 } 96 97 pte = pte_offset_kernel(pmd, addr); 98 if (!pte_none(*pte)) { 99 pte_ERROR(*pte); 100 return; 101 } 102 103 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 104 105 flush_tlb_one(get_asid(), addr); 106 } 107 108 /* 109 * As a performance optimization, other platforms preserve the fixmap mapping 110 * across a context switch, we don't presently do this, but this could be done 111 * in a similar fashion as to the wired TLB interface that sh64 uses (by way 112 * of the memory mapped UTLB configuration) -- this unfortunately forces us to 113 * give up a TLB entry for each mapping we want to preserve. While this may be 114 * viable for a small number of fixmaps, it's not particularly useful for 115 * everything and needs to be carefully evaluated. (ie, we may want this for 116 * the vsyscall page). 117 * 118 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass 119 * in at __set_fixmap() time to determine the appropriate behavior to follow. 120 * 121 * -- PFM. 122 */ 123 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 124 { 125 unsigned long address = __fix_to_virt(idx); 126 127 if (idx >= __end_of_fixed_addresses) { 128 BUG(); 129 return; 130 } 131 132 set_pte_phys(address, phys, prot); 133 } 134 #endif /* CONFIG_MMU */ 135 136 /* 137 * paging_init() sets up the page tables 138 */ 139 void __init paging_init(void) 140 { 141 unsigned long max_zone_pfns[MAX_NR_ZONES]; 142 int nid; 143 144 /* We don't need to map the kernel through the TLB, as 145 * it is permanatly mapped using P1. So clear the 146 * entire pgd. */ 147 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 148 149 /* Set an initial value for the MMU.TTB so we don't have to 150 * check for a null value. */ 151 set_TTB(swapper_pg_dir); 152 153 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 154 155 for_each_online_node(nid) { 156 pg_data_t *pgdat = NODE_DATA(nid); 157 unsigned long low, start_pfn; 158 159 start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT; 160 low = pgdat->bdata->node_low_pfn; 161 162 if (max_zone_pfns[ZONE_NORMAL] < low) 163 max_zone_pfns[ZONE_NORMAL] = low; 164 165 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", 166 nid, start_pfn, low); 167 } 168 169 free_area_init_nodes(max_zone_pfns); 170 } 171 172 static struct kcore_list kcore_mem, kcore_vmalloc; 173 174 void __init mem_init(void) 175 { 176 int codesize, datasize, initsize; 177 int nid; 178 179 num_physpages = 0; 180 high_memory = NULL; 181 182 for_each_online_node(nid) { 183 pg_data_t *pgdat = NODE_DATA(nid); 184 unsigned long node_pages = 0; 185 void *node_high_memory; 186 187 num_physpages += pgdat->node_present_pages; 188 189 if (pgdat->node_spanned_pages) 190 node_pages = free_all_bootmem_node(pgdat); 191 192 totalram_pages += node_pages; 193 194 node_high_memory = (void *)__va((pgdat->node_start_pfn + 195 pgdat->node_spanned_pages) << 196 PAGE_SHIFT); 197 if (node_high_memory > high_memory) 198 high_memory = node_high_memory; 199 } 200 201 /* clear the zero-page */ 202 memset(empty_zero_page, 0, PAGE_SIZE); 203 __flush_wback_region(empty_zero_page, PAGE_SIZE); 204 205 /* 206 * Setup wrappers for copy/clear_page(), these will get overridden 207 * later in the boot process if a better method is available. 208 */ 209 #ifdef CONFIG_MMU 210 copy_page = copy_page_slow; 211 clear_page = clear_page_slow; 212 #else 213 copy_page = copy_page_nommu; 214 clear_page = clear_page_nommu; 215 #endif 216 217 codesize = (unsigned long) &_etext - (unsigned long) &_text; 218 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 219 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 220 221 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 222 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 223 VMALLOC_END - VMALLOC_START); 224 225 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " 226 "%dk data, %dk init)\n", 227 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 228 num_physpages << (PAGE_SHIFT-10), 229 codesize >> 10, 230 datasize >> 10, 231 initsize >> 10); 232 233 p3_cache_init(); 234 235 /* Initialize the vDSO */ 236 vsyscall_init(); 237 } 238 239 void free_initmem(void) 240 { 241 unsigned long addr; 242 243 addr = (unsigned long)(&__init_begin); 244 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 245 ClearPageReserved(virt_to_page(addr)); 246 init_page_count(virt_to_page(addr)); 247 free_page(addr); 248 totalram_pages++; 249 } 250 printk("Freeing unused kernel memory: %ldk freed\n", 251 ((unsigned long)&__init_end - 252 (unsigned long)&__init_begin) >> 10); 253 } 254 255 #ifdef CONFIG_BLK_DEV_INITRD 256 void free_initrd_mem(unsigned long start, unsigned long end) 257 { 258 unsigned long p; 259 for (p = start; p < end; p += PAGE_SIZE) { 260 ClearPageReserved(virt_to_page(p)); 261 init_page_count(virt_to_page(p)); 262 free_page(p); 263 totalram_pages++; 264 } 265 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 266 } 267 #endif 268 269 #ifdef CONFIG_MEMORY_HOTPLUG 270 void online_page(struct page *page) 271 { 272 ClearPageReserved(page); 273 init_page_count(page); 274 __free_page(page); 275 totalram_pages++; 276 num_physpages++; 277 } 278 279 int arch_add_memory(int nid, u64 start, u64 size) 280 { 281 pg_data_t *pgdat; 282 unsigned long start_pfn = start >> PAGE_SHIFT; 283 unsigned long nr_pages = size >> PAGE_SHIFT; 284 int ret; 285 286 pgdat = NODE_DATA(nid); 287 288 /* We only have ZONE_NORMAL, so this is easy.. */ 289 ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages); 290 if (unlikely(ret)) 291 printk("%s: Failed, __add_pages() == %d\n", __FUNCTION__, ret); 292 293 return ret; 294 } 295 EXPORT_SYMBOL_GPL(arch_add_memory); 296 297 #ifdef CONFIG_NUMA 298 int memory_add_physaddr_to_nid(u64 addr) 299 { 300 /* Node 0 for now.. */ 301 return 0; 302 } 303 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 304 #endif 305 #endif 306