arch/sh/mm/init.c

   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 */