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/gfp.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/percpu.h>
  18 #include <linux/io.h>
  19 #include <linux/dma-mapping.h>
  20 #include <asm/mmu_context.h>
  21 #include <asm/tlb.h>
  22 #include <asm/cacheflush.h>
  23 #include <asm/sections.h>
  24 #include <asm/cache.h>
  25 #include <asm/sizes.h>
  26
  27 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  28 pgd_t swapper_pg_dir[PTRS_PER_PGD];
  29
  30 #ifdef CONFIG_MMU
  31 static pte_t *__get_pte_phys(unsigned long addr)
  32 {
  33         pgd_t *pgd;
  34         pud_t *pud;
  35         pmd_t *pmd;
  36         pte_t *pte;
  37
  38         pgd = pgd_offset_k(addr);
  39         if (pgd_none(*pgd)) {
  40                 pgd_ERROR(*pgd);
  41                 return NULL;
  42         }
  43
  44         pud = pud_alloc(NULL, pgd, addr);
  45         if (unlikely(!pud)) {
  46                 pud_ERROR(*pud);
  47                 return NULL;
  48         }
  49
  50         pmd = pmd_alloc(NULL, pud, addr);
  51         if (unlikely(!pmd)) {
  52                 pmd_ERROR(*pmd);
  53                 return NULL;
  54         }
  55
  56         pte = pte_offset_kernel(pmd, addr);
  57         return pte;
  58 }
  59
  60 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  61 {
  62         pte_t *pte;
  63
  64         pte = __get_pte_phys(addr);
  65         if (!pte_none(*pte)) {
  66                 pte_ERROR(*pte);
  67                 return;
  68         }
  69
  70         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  71         local_flush_tlb_one(get_asid(), addr);
  72
  73         if (pgprot_val(prot) & _PAGE_WIRED)
  74                 tlb_wire_entry(NULL, addr, *pte);
  75 }
  76
  77 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  78 {
  79         pte_t *pte;
  80
  81         pte = __get_pte_phys(addr);
  82
  83         if (pgprot_val(prot) & _PAGE_WIRED)
  84                 tlb_unwire_entry();
  85
  86         set_pte(pte, pfn_pte(0, __pgprot(0)));
  87         local_flush_tlb_one(get_asid(), addr);
  88 }
  89
  90 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  91 {
  92         unsigned long address = __fix_to_virt(idx);
  93
  94         if (idx >= __end_of_fixed_addresses) {
  95                 BUG();
  96                 return;
  97         }
  98
  99         set_pte_phys(address, phys, prot);
 100 }
 101
 102 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 103 {
 104         unsigned long address = __fix_to_virt(idx);
 105
 106         if (idx >= __end_of_fixed_addresses) {
 107                 BUG();
 108                 return;
 109         }
 110
 111         clear_pte_phys(address, prot);
 112 }
 113
 114 void __init page_table_range_init(unsigned long start, unsigned long end,
 115                                          pgd_t *pgd_base)
 116 {
 117         pgd_t *pgd;
 118         pud_t *pud;
 119         pmd_t *pmd;
 120         pte_t *pte;
 121         int i, j, k;
 122         unsigned long vaddr;
 123
 124         vaddr = start;
 125         i = __pgd_offset(vaddr);
 126         j = __pud_offset(vaddr);
 127         k = __pmd_offset(vaddr);
 128         pgd = pgd_base + i;
 129
 130         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 131                 pud = (pud_t *)pgd;
 132                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 133 #ifdef __PAGETABLE_PMD_FOLDED
 134                         pmd = (pmd_t *)pud;
 135 #else
 136                         pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
 137                         pud_populate(&init_mm, pud, pmd);
 138                         pmd += k;
 139 #endif
 140                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 141                                 if (pmd_none(*pmd)) {
 142                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
 143                                         pmd_populate_kernel(&init_mm, pmd, pte);
 144                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
 145                                 }
 146                                 vaddr += PMD_SIZE;
 147                         }
 148                         k = 0;
 149                 }
 150                 j = 0;
 151         }
 152 }
 153 #endif  /* CONFIG_MMU */
 154
 155 /*
 156  * paging_init() sets up the page tables
 157  */
 158 void __init paging_init(void)
 159 {
 160         unsigned long max_zone_pfns[MAX_NR_ZONES];
 161         unsigned long vaddr, end;
 162         int nid;
 163
 164         /* We don't need to map the kernel through the TLB, as
 165          * it is permanatly mapped using P1. So clear the
 166          * entire pgd. */
 167         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 168
 169         /* Set an initial value for the MMU.TTB so we don't have to
 170          * check for a null value. */
 171         set_TTB(swapper_pg_dir);
 172
 173         /*
 174          * Populate the relevant portions of swapper_pg_dir so that
 175          * we can use the fixmap entries without calling kmalloc.
 176          * pte's will be filled in by __set_fixmap().
 177          */
 178         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 179         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 180         page_table_range_init(vaddr, end, swapper_pg_dir);
 181
 182         kmap_coherent_init();
 183
 184         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 185
 186         for_each_online_node(nid) {
 187                 pg_data_t *pgdat = NODE_DATA(nid);
 188                 unsigned long low, start_pfn;
 189
 190                 start_pfn = pgdat->bdata->node_min_pfn;
 191                 low = pgdat->bdata->node_low_pfn;
 192
 193                 if (max_zone_pfns[ZONE_NORMAL] < low)
 194                         max_zone_pfns[ZONE_NORMAL] = low;
 195
 196                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 197                        nid, start_pfn, low);
 198         }
 199
 200         free_area_init_nodes(max_zone_pfns);
 201 }
 202
 203 /*
 204  * Early initialization for any I/O MMUs we might have.
 205  */
 206 static void __init iommu_init(void)
 207 {
 208         no_iommu_init();
 209 }
 210
 211 unsigned int mem_init_done = 0;
 212
 213 void __init mem_init(void)
 214 {
 215         int codesize, datasize, initsize;
 216         int nid;
 217
 218         iommu_init();
 219
 220         num_physpages = 0;
 221         high_memory = NULL;
 222
 223         for_each_online_node(nid) {
 224                 pg_data_t *pgdat = NODE_DATA(nid);
 225                 unsigned long node_pages = 0;
 226                 void *node_high_memory;
 227
 228                 num_physpages += pgdat->node_present_pages;
 229
 230                 if (pgdat->node_spanned_pages)
 231                         node_pages = free_all_bootmem_node(pgdat);
 232
 233                 totalram_pages += node_pages;
 234
 235                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
 236                                                  pgdat->node_spanned_pages) <<
 237                                                  PAGE_SHIFT);
 238                 if (node_high_memory > high_memory)
 239                         high_memory = node_high_memory;
 240         }
 241
 242         /* Set this up early, so we can take care of the zero page */
 243         cpu_cache_init();
 244
 245         /* clear the zero-page */
 246         memset(empty_zero_page, 0, PAGE_SIZE);
 247         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 248
 249         vsyscall_init();
 250
 251         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 252         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 253         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 254
 255         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 256                "%dk data, %dk init)\n",
 257                 nr_free_pages() << (PAGE_SHIFT-10),
 258                 num_physpages << (PAGE_SHIFT-10),
 259                 codesize >> 10,
 260                 datasize >> 10,
 261                 initsize >> 10);
 262
 263         printk(KERN_INFO "virtual kernel memory layout:\n"
 264                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 265 #ifdef CONFIG_HIGHMEM
 266                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 267 #endif
 268                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 269                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 270 #ifdef CONFIG_UNCACHED_MAPPING
 271                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 272 #endif
 273                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 274                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 275                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 276                 FIXADDR_START, FIXADDR_TOP,
 277                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 278
 279 #ifdef CONFIG_HIGHMEM
 280                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 281                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 282 #endif
 283
 284                 (unsigned long)VMALLOC_START, VMALLOC_END,
 285                 (VMALLOC_END - VMALLOC_START) >> 20,
 286
 287                 (unsigned long)memory_start, (unsigned long)high_memory,
 288                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 289
 290 #ifdef CONFIG_UNCACHED_MAPPING
 291                 uncached_start, uncached_end, uncached_size >> 20,
 292 #endif
 293
 294                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 295                 ((unsigned long)&__init_end -
 296                  (unsigned long)&__init_begin) >> 10,
 297
 298                 (unsigned long)&_etext, (unsigned long)&_edata,
 299                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 300
 301                 (unsigned long)&_text, (unsigned long)&_etext,
 302                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 303
 304         mem_init_done = 1;
 305 }
 306
 307 void free_initmem(void)
 308 {
 309         unsigned long addr;
 310
 311         addr = (unsigned long)(&__init_begin);
 312         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 313                 ClearPageReserved(virt_to_page(addr));
 314                 init_page_count(virt_to_page(addr));
 315                 free_page(addr);
 316                 totalram_pages++;
 317         }
 318         printk("Freeing unused kernel memory: %ldk freed\n",
 319                ((unsigned long)&__init_end -
 320                 (unsigned long)&__init_begin) >> 10);
 321 }
 322
 323 #ifdef CONFIG_BLK_DEV_INITRD
 324 void free_initrd_mem(unsigned long start, unsigned long end)
 325 {
 326         unsigned long p;
 327         for (p = start; p < end; p += PAGE_SIZE) {
 328                 ClearPageReserved(virt_to_page(p));
 329                 init_page_count(virt_to_page(p));
 330                 free_page(p);
 331                 totalram_pages++;
 332         }
 333         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 334 }
 335 #endif
 336
 337 #ifdef CONFIG_MEMORY_HOTPLUG
 338 int arch_add_memory(int nid, u64 start, u64 size)
 339 {
 340         pg_data_t *pgdat;
 341         unsigned long start_pfn = start >> PAGE_SHIFT;
 342         unsigned long nr_pages = size >> PAGE_SHIFT;
 343         int ret;
 344
 345         pgdat = NODE_DATA(nid);
 346
 347         /* We only have ZONE_NORMAL, so this is easy.. */
 348         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
 349                                 start_pfn, nr_pages);
 350         if (unlikely(ret))
 351                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 352
 353         return ret;
 354 }
 355 EXPORT_SYMBOL_GPL(arch_add_memory);
 356
 357 #ifdef CONFIG_NUMA
 358 int memory_add_physaddr_to_nid(u64 addr)
 359 {
 360         /* Node 0 for now.. */
 361         return 0;
 362 }
 363 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 364 #endif
 365
 366 #endif /* CONFIG_MEMORY_HOTPLUG */