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   1 /*
   2  * linux/arch/sh/mm/init.c
   3  *
   4  *  Copyright (C) 1999  Niibe Yutaka
   5  *  Copyright (C) 2002 - 2010  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/lmb.h>
  20 #include <linux/dma-mapping.h>
  21 #include <asm/mmu_context.h>
  22 #include <asm/tlb.h>
  23 #include <asm/cacheflush.h>
  24 #include <asm/sections.h>
  25 #include <asm/cache.h>
  26 #include <asm/sizes.h>
  27
  28 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  29 pgd_t swapper_pg_dir[PTRS_PER_PGD];
  30
  31 void __init generic_mem_init(void)
  32 {
  33         lmb_add(__MEMORY_START, __MEMORY_SIZE);
  34 }
  35
  36 #ifdef CONFIG_MMU
  37 static pte_t *__get_pte_phys(unsigned long addr)
  38 {
  39         pgd_t *pgd;
  40         pud_t *pud;
  41         pmd_t *pmd;
  42         pte_t *pte;
  43
  44         pgd = pgd_offset_k(addr);
  45         if (pgd_none(*pgd)) {
  46                 pgd_ERROR(*pgd);
  47                 return NULL;
  48         }
  49
  50         pud = pud_alloc(NULL, pgd, addr);
  51         if (unlikely(!pud)) {
  52                 pud_ERROR(*pud);
  53                 return NULL;
  54         }
  55
  56         pmd = pmd_alloc(NULL, pud, addr);
  57         if (unlikely(!pmd)) {
  58                 pmd_ERROR(*pmd);
  59                 return NULL;
  60         }
  61
  62         pte = pte_offset_kernel(pmd, addr);
  63         return pte;
  64 }
  65
  66 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  67 {
  68         pte_t *pte;
  69
  70         pte = __get_pte_phys(addr);
  71         if (!pte_none(*pte)) {
  72                 pte_ERROR(*pte);
  73                 return;
  74         }
  75
  76         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  77         local_flush_tlb_one(get_asid(), addr);
  78
  79         if (pgprot_val(prot) & _PAGE_WIRED)
  80                 tlb_wire_entry(NULL, addr, *pte);
  81 }
  82
  83 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  84 {
  85         pte_t *pte;
  86
  87         pte = __get_pte_phys(addr);
  88
  89         if (pgprot_val(prot) & _PAGE_WIRED)
  90                 tlb_unwire_entry();
  91
  92         set_pte(pte, pfn_pte(0, __pgprot(0)));
  93         local_flush_tlb_one(get_asid(), addr);
  94 }
  95
  96 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  97 {
  98         unsigned long address = __fix_to_virt(idx);
  99
 100         if (idx >= __end_of_fixed_addresses) {
 101                 BUG();
 102                 return;
 103         }
 104
 105         set_pte_phys(address, phys, prot);
 106 }
 107
 108 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 109 {
 110         unsigned long address = __fix_to_virt(idx);
 111
 112         if (idx >= __end_of_fixed_addresses) {
 113                 BUG();
 114                 return;
 115         }
 116
 117         clear_pte_phys(address, prot);
 118 }
 119
 120 void __init page_table_range_init(unsigned long start, unsigned long end,
 121                                          pgd_t *pgd_base)
 122 {
 123         pgd_t *pgd;
 124         pud_t *pud;
 125         pmd_t *pmd;
 126         pte_t *pte;
 127         int i, j, k;
 128         unsigned long vaddr;
 129
 130         vaddr = start;
 131         i = __pgd_offset(vaddr);
 132         j = __pud_offset(vaddr);
 133         k = __pmd_offset(vaddr);
 134         pgd = pgd_base + i;
 135
 136         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 137                 pud = (pud_t *)pgd;
 138                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 139 #ifdef __PAGETABLE_PMD_FOLDED
 140                         pmd = (pmd_t *)pud;
 141 #else
 142                         pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
 143                         pud_populate(&init_mm, pud, pmd);
 144                         pmd += k;
 145 #endif
 146                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 147                                 if (pmd_none(*pmd)) {
 148                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
 149                                         pmd_populate_kernel(&init_mm, pmd, pte);
 150                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
 151                                 }
 152                                 vaddr += PMD_SIZE;
 153                         }
 154                         k = 0;
 155                 }
 156                 j = 0;
 157         }
 158 }
 159 #endif  /* CONFIG_MMU */
 160
 161 /*
 162  * paging_init() sets up the page tables
 163  */
 164 void __init paging_init(void)
 165 {
 166         unsigned long max_zone_pfns[MAX_NR_ZONES];
 167         unsigned long vaddr, end;
 168         int nid;
 169
 170         /* We don't need to map the kernel through the TLB, as
 171          * it is permanatly mapped using P1. So clear the
 172          * entire pgd. */
 173         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 174
 175         /* Set an initial value for the MMU.TTB so we don't have to
 176          * check for a null value. */
 177         set_TTB(swapper_pg_dir);
 178
 179         /*
 180          * Populate the relevant portions of swapper_pg_dir so that
 181          * we can use the fixmap entries without calling kmalloc.
 182          * pte's will be filled in by __set_fixmap().
 183          */
 184         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 185         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 186         page_table_range_init(vaddr, end, swapper_pg_dir);
 187
 188         kmap_coherent_init();
 189
 190         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 191
 192         for_each_online_node(nid) {
 193                 pg_data_t *pgdat = NODE_DATA(nid);
 194                 unsigned long low, start_pfn;
 195
 196                 start_pfn = pgdat->bdata->node_min_pfn;
 197                 low = pgdat->bdata->node_low_pfn;
 198
 199                 if (max_zone_pfns[ZONE_NORMAL] < low)
 200                         max_zone_pfns[ZONE_NORMAL] = low;
 201
 202                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 203                        nid, start_pfn, low);
 204         }
 205
 206         free_area_init_nodes(max_zone_pfns);
 207 }
 208
 209 /*
 210  * Early initialization for any I/O MMUs we might have.
 211  */
 212 static void __init iommu_init(void)
 213 {
 214         no_iommu_init();
 215 }
 216
 217 unsigned int mem_init_done = 0;
 218
 219 void __init mem_init(void)
 220 {
 221         int codesize, datasize, initsize;
 222         int nid;
 223
 224         iommu_init();
 225
 226         num_physpages = 0;
 227         high_memory = NULL;
 228
 229         for_each_online_node(nid) {
 230                 pg_data_t *pgdat = NODE_DATA(nid);
 231                 unsigned long node_pages = 0;
 232                 void *node_high_memory;
 233
 234                 num_physpages += pgdat->node_present_pages;
 235
 236                 if (pgdat->node_spanned_pages)
 237                         node_pages = free_all_bootmem_node(pgdat);
 238
 239                 totalram_pages += node_pages;
 240
 241                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
 242                                                  pgdat->node_spanned_pages) <<
 243                                                  PAGE_SHIFT);
 244                 if (node_high_memory > high_memory)
 245                         high_memory = node_high_memory;
 246         }
 247
 248         /* Set this up early, so we can take care of the zero page */
 249         cpu_cache_init();
 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         vsyscall_init();
 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         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 262                "%dk data, %dk init)\n",
 263                 nr_free_pages() << (PAGE_SHIFT-10),
 264                 num_physpages << (PAGE_SHIFT-10),
 265                 codesize >> 10,
 266                 datasize >> 10,
 267                 initsize >> 10);
 268
 269         printk(KERN_INFO "virtual kernel memory layout:\n"
 270                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 271 #ifdef CONFIG_HIGHMEM
 272                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 273 #endif
 274                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 275                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 276 #ifdef CONFIG_UNCACHED_MAPPING
 277                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 278 #endif
 279                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 280                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 281                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 282                 FIXADDR_START, FIXADDR_TOP,
 283                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 284
 285 #ifdef CONFIG_HIGHMEM
 286                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 287                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 288 #endif
 289
 290                 (unsigned long)VMALLOC_START, VMALLOC_END,
 291                 (VMALLOC_END - VMALLOC_START) >> 20,
 292
 293                 (unsigned long)memory_start, (unsigned long)high_memory,
 294                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 295
 296 #ifdef CONFIG_UNCACHED_MAPPING
 297                 uncached_start, uncached_end, uncached_size >> 20,
 298 #endif
 299
 300                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 301                 ((unsigned long)&__init_end -
 302                  (unsigned long)&__init_begin) >> 10,
 303
 304                 (unsigned long)&_etext, (unsigned long)&_edata,
 305                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 306
 307                 (unsigned long)&_text, (unsigned long)&_etext,
 308                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 309
 310         mem_init_done = 1;
 311 }
 312
 313 void free_initmem(void)
 314 {
 315         unsigned long addr;
 316
 317         addr = (unsigned long)(&__init_begin);
 318         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 319                 ClearPageReserved(virt_to_page(addr));
 320                 init_page_count(virt_to_page(addr));
 321                 free_page(addr);
 322                 totalram_pages++;
 323         }
 324         printk("Freeing unused kernel memory: %ldk freed\n",
 325                ((unsigned long)&__init_end -
 326                 (unsigned long)&__init_begin) >> 10);
 327 }
 328
 329 #ifdef CONFIG_BLK_DEV_INITRD
 330 void free_initrd_mem(unsigned long start, unsigned long end)
 331 {
 332         unsigned long p;
 333         for (p = start; p < end; p += PAGE_SIZE) {
 334                 ClearPageReserved(virt_to_page(p));
 335                 init_page_count(virt_to_page(p));
 336                 free_page(p);
 337                 totalram_pages++;
 338         }
 339         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 340 }
 341 #endif
 342
 343 #ifdef CONFIG_MEMORY_HOTPLUG
 344 int arch_add_memory(int nid, u64 start, u64 size)
 345 {
 346         pg_data_t *pgdat;
 347         unsigned long start_pfn = start >> PAGE_SHIFT;
 348         unsigned long nr_pages = size >> PAGE_SHIFT;
 349         int ret;
 350
 351         pgdat = NODE_DATA(nid);
 352
 353         /* We only have ZONE_NORMAL, so this is easy.. */
 354         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
 355                                 start_pfn, nr_pages);
 356         if (unlikely(ret))
 357                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 358
 359         return ret;
 360 }
 361 EXPORT_SYMBOL_GPL(arch_add_memory);
 362
 363 #ifdef CONFIG_NUMA
 364 int memory_add_physaddr_to_nid(u64 addr)
 365 {
 366         /* Node 0 for now.. */
 367         return 0;
 368 }
 369 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 370 #endif
 371
 372 #endif /* CONFIG_MEMORY_HOTPLUG */