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   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_UNCACHED_MAPPING
  30 /*
  31  * This is the offset of the uncached section from its cached alias.
  32  *
  33  * Legacy platforms handle trivial transitions between cached and
  34  * uncached segments by making use of the 1:1 mapping relationship in
  35  * 512MB lowmem, others via a special uncached mapping.
  36  *
  37  * Default value only valid in 29 bit mode, in 32bit mode this will be
  38  * updated by the early PMB initialization code.
  39  */
  40 unsigned long cached_to_uncached = 0x20000000;
  41 unsigned long uncached_size = SZ_512M;
  42 #endif
  43
  44 #ifdef CONFIG_MMU
  45 static pte_t *__get_pte_phys(unsigned long addr)
  46 {
  47         pgd_t *pgd;
  48         pud_t *pud;
  49         pmd_t *pmd;
  50         pte_t *pte;
  51
  52         pgd = pgd_offset_k(addr);
  53         if (pgd_none(*pgd)) {
  54                 pgd_ERROR(*pgd);
  55                 return NULL;
  56         }
  57
  58         pud = pud_alloc(NULL, pgd, addr);
  59         if (unlikely(!pud)) {
  60                 pud_ERROR(*pud);
  61                 return NULL;
  62         }
  63
  64         pmd = pmd_alloc(NULL, pud, addr);
  65         if (unlikely(!pmd)) {
  66                 pmd_ERROR(*pmd);
  67                 return NULL;
  68         }
  69
  70         pte = pte_offset_kernel(pmd, addr);
  71         return pte;
  72 }
  73
  74 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  75 {
  76         pte_t *pte;
  77
  78         pte = __get_pte_phys(addr);
  79         if (!pte_none(*pte)) {
  80                 pte_ERROR(*pte);
  81                 return;
  82         }
  83
  84         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  85         local_flush_tlb_one(get_asid(), addr);
  86
  87         if (pgprot_val(prot) & _PAGE_WIRED)
  88                 tlb_wire_entry(NULL, addr, *pte);
  89 }
  90
  91 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  92 {
  93         pte_t *pte;
  94
  95         pte = __get_pte_phys(addr);
  96
  97         if (pgprot_val(prot) & _PAGE_WIRED)
  98                 tlb_unwire_entry();
  99
 100         set_pte(pte, pfn_pte(0, __pgprot(0)));
 101         local_flush_tlb_one(get_asid(), addr);
 102 }
 103
 104 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 105 {
 106         unsigned long address = __fix_to_virt(idx);
 107
 108         if (idx >= __end_of_fixed_addresses) {
 109                 BUG();
 110                 return;
 111         }
 112
 113         set_pte_phys(address, phys, prot);
 114 }
 115
 116 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 117 {
 118         unsigned long address = __fix_to_virt(idx);
 119
 120         if (idx >= __end_of_fixed_addresses) {
 121                 BUG();
 122                 return;
 123         }
 124
 125         clear_pte_phys(address, prot);
 126 }
 127
 128 void __init page_table_range_init(unsigned long start, unsigned long end,
 129                                          pgd_t *pgd_base)
 130 {
 131         pgd_t *pgd;
 132         pud_t *pud;
 133         pmd_t *pmd;
 134         pte_t *pte;
 135         int i, j, k;
 136         unsigned long vaddr;
 137
 138         vaddr = start;
 139         i = __pgd_offset(vaddr);
 140         j = __pud_offset(vaddr);
 141         k = __pmd_offset(vaddr);
 142         pgd = pgd_base + i;
 143
 144         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 145                 pud = (pud_t *)pgd;
 146                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 147 #ifdef __PAGETABLE_PMD_FOLDED
 148                         pmd = (pmd_t *)pud;
 149 #else
 150                         pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
 151                         pud_populate(&init_mm, pud, pmd);
 152                         pmd += k;
 153 #endif
 154                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 155                                 if (pmd_none(*pmd)) {
 156                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
 157                                         pmd_populate_kernel(&init_mm, pmd, pte);
 158                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
 159                                 }
 160                                 vaddr += PMD_SIZE;
 161                         }
 162                         k = 0;
 163                 }
 164                 j = 0;
 165         }
 166 }
 167 #endif  /* CONFIG_MMU */
 168
 169 /*
 170  * paging_init() sets up the page tables
 171  */
 172 void __init paging_init(void)
 173 {
 174         unsigned long max_zone_pfns[MAX_NR_ZONES];
 175         unsigned long vaddr, end;
 176         int nid;
 177
 178         /* We don't need to map the kernel through the TLB, as
 179          * it is permanatly mapped using P1. So clear the
 180          * entire pgd. */
 181         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 182
 183         /* Set an initial value for the MMU.TTB so we don't have to
 184          * check for a null value. */
 185         set_TTB(swapper_pg_dir);
 186
 187         /*
 188          * Populate the relevant portions of swapper_pg_dir so that
 189          * we can use the fixmap entries without calling kmalloc.
 190          * pte's will be filled in by __set_fixmap().
 191          */
 192         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 193         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 194         page_table_range_init(vaddr, end, swapper_pg_dir);
 195
 196         kmap_coherent_init();
 197
 198         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 199
 200         for_each_online_node(nid) {
 201                 pg_data_t *pgdat = NODE_DATA(nid);
 202                 unsigned long low, start_pfn;
 203
 204                 start_pfn = pgdat->bdata->node_min_pfn;
 205                 low = pgdat->bdata->node_low_pfn;
 206
 207                 if (max_zone_pfns[ZONE_NORMAL] < low)
 208                         max_zone_pfns[ZONE_NORMAL] = low;
 209
 210                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 211                        nid, start_pfn, low);
 212         }
 213
 214         free_area_init_nodes(max_zone_pfns);
 215 }
 216
 217 /*
 218  * Early initialization for any I/O MMUs we might have.
 219  */
 220 static void __init iommu_init(void)
 221 {
 222         no_iommu_init();
 223 }
 224
 225 unsigned int mem_init_done = 0;
 226
 227 void __init mem_init(void)
 228 {
 229         int codesize, datasize, initsize;
 230         int nid;
 231
 232         iommu_init();
 233
 234         num_physpages = 0;
 235         high_memory = NULL;
 236
 237         for_each_online_node(nid) {
 238                 pg_data_t *pgdat = NODE_DATA(nid);
 239                 unsigned long node_pages = 0;
 240                 void *node_high_memory;
 241
 242                 num_physpages += pgdat->node_present_pages;
 243
 244                 if (pgdat->node_spanned_pages)
 245                         node_pages = free_all_bootmem_node(pgdat);
 246
 247                 totalram_pages += node_pages;
 248
 249                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
 250                                                  pgdat->node_spanned_pages) <<
 251                                                  PAGE_SHIFT);
 252                 if (node_high_memory > high_memory)
 253                         high_memory = node_high_memory;
 254         }
 255
 256         /* Set this up early, so we can take care of the zero page */
 257         cpu_cache_init();
 258
 259         /* clear the zero-page */
 260         memset(empty_zero_page, 0, PAGE_SIZE);
 261         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 262
 263         /* Initialize the vDSO */
 264         vsyscall_init();
 265
 266         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 267         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 268         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 269
 270         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 271                "%dk data, %dk init)\n",
 272                 nr_free_pages() << (PAGE_SHIFT-10),
 273                 num_physpages << (PAGE_SHIFT-10),
 274                 codesize >> 10,
 275                 datasize >> 10,
 276                 initsize >> 10);
 277
 278         printk(KERN_INFO "virtual kernel memory layout:\n"
 279                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 280 #ifdef CONFIG_HIGHMEM
 281                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 282 #endif
 283                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 284                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 285 #ifdef CONFIG_UNCACHED_MAPPING
 286                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 287 #endif
 288                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 289                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 290                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 291                 FIXADDR_START, FIXADDR_TOP,
 292                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 293
 294 #ifdef CONFIG_HIGHMEM
 295                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 296                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 297 #endif
 298
 299                 (unsigned long)VMALLOC_START, VMALLOC_END,
 300                 (VMALLOC_END - VMALLOC_START) >> 20,
 301
 302                 (unsigned long)memory_start, (unsigned long)high_memory,
 303                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 304
 305 #ifdef CONFIG_UNCACHED_MAPPING
 306                 (unsigned long)memory_start + cached_to_uncached,
 307                 (unsigned long)memory_start + cached_to_uncached + uncached_size,
 308                 uncached_size >> 20,
 309 #endif
 310
 311                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 312                 ((unsigned long)&__init_end -
 313                  (unsigned long)&__init_begin) >> 10,
 314
 315                 (unsigned long)&_etext, (unsigned long)&_edata,
 316                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 317
 318                 (unsigned long)&_text, (unsigned long)&_etext,
 319                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 320
 321         mem_init_done = 1;
 322 }
 323
 324 void free_initmem(void)
 325 {
 326         unsigned long addr;
 327
 328         addr = (unsigned long)(&__init_begin);
 329         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 330                 ClearPageReserved(virt_to_page(addr));
 331                 init_page_count(virt_to_page(addr));
 332                 free_page(addr);
 333                 totalram_pages++;
 334         }
 335         printk("Freeing unused kernel memory: %ldk freed\n",
 336                ((unsigned long)&__init_end -
 337                 (unsigned long)&__init_begin) >> 10);
 338 }
 339
 340 #ifdef CONFIG_BLK_DEV_INITRD
 341 void free_initrd_mem(unsigned long start, unsigned long end)
 342 {
 343         unsigned long p;
 344         for (p = start; p < end; p += PAGE_SIZE) {
 345                 ClearPageReserved(virt_to_page(p));
 346                 init_page_count(virt_to_page(p));
 347                 free_page(p);
 348                 totalram_pages++;
 349         }
 350         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 351 }
 352 #endif
 353
 354 #ifdef CONFIG_MEMORY_HOTPLUG
 355 int arch_add_memory(int nid, u64 start, u64 size)
 356 {
 357         pg_data_t *pgdat;
 358         unsigned long start_pfn = start >> PAGE_SHIFT;
 359         unsigned long nr_pages = size >> PAGE_SHIFT;
 360         int ret;
 361
 362         pgdat = NODE_DATA(nid);
 363
 364         /* We only have ZONE_NORMAL, so this is easy.. */
 365         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
 366                                 start_pfn, nr_pages);
 367         if (unlikely(ret))
 368                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 369
 370         return ret;
 371 }
 372 EXPORT_SYMBOL_GPL(arch_add_memory);
 373
 374 #ifdef CONFIG_NUMA
 375 int memory_add_physaddr_to_nid(u64 addr)
 376 {
 377         /* Node 0 for now.. */
 378         return 0;
 379 }
 380 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 381 #endif
 382
 383 #endif /* CONFIG_MEMORY_HOTPLUG */