arch/m68k/mm/init.c

   1 /*
   2  *  linux/arch/m68k/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Hamish Macdonald
   5  *
   6  *  Contains common initialization routines, specific init code moved
   7  *  to motorola.c and sun3mmu.c
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/signal.h>
  12 #include <linux/sched.h>
  13 #include <linux/mm.h>
  14 #include <linux/swap.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18 #include <linux/init.h>
  19 #include <linux/bootmem.h>
  20 #include <linux/gfp.h>
  21
  22 #include <asm/setup.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/page.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/traps.h>
  27 #include <asm/machdep.h>
  28 #include <asm/io.h>
  29 #ifdef CONFIG_ATARI
  30 #include <asm/atari_stram.h>
  31 #endif
  32 #include <asm/sections.h>
  33 #include <asm/tlb.h>
  34
  35 /*
  36  * ZERO_PAGE is a special page that is used for zero-initialized
  37  * data and COW.
  38  */
  39 void *empty_zero_page;
  40 EXPORT_SYMBOL(empty_zero_page);
  41
  42 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
  43 extern void init_pointer_table(unsigned long ptable);
  44 extern pmd_t *zero_pgtable;
  45 #endif
  46
  47 #ifdef CONFIG_MMU
  48
  49 pg_data_t pg_data_map[MAX_NUMNODES];
  50 EXPORT_SYMBOL(pg_data_map);
  51
  52 int m68k_virt_to_node_shift;
  53
  54 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  55 pg_data_t *pg_data_table[65];
  56 EXPORT_SYMBOL(pg_data_table);
  57 #endif
  58
  59 void __init m68k_setup_node(int node)
  60 {
  61 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  62         struct mem_info *info = m68k_memory + node;
  63         int i, end;
  64
  65         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  66         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  67         for (; i <= end; i++) {
  68                 if (pg_data_table[i])
  69                         printk("overlap at %u for chunk %u\n", i, node);
  70                 pg_data_table[i] = pg_data_map + node;
  71         }
  72 #endif
  73         pg_data_map[node].bdata = bootmem_node_data + node;
  74         node_set_online(node);
  75 }
  76
  77 #else /* CONFIG_MMU */
  78
  79 /*
  80  * paging_init() continues the virtual memory environment setup which
  81  * was begun by the code in arch/head.S.
  82  * The parameters are pointers to where to stick the starting and ending
  83  * addresses of available kernel virtual memory.
  84  */
  85 void __init paging_init(void)
  86 {
  87         /*
  88          * Make sure start_mem is page aligned, otherwise bootmem and
  89          * page_alloc get different views of the world.
  90          */
  91         unsigned long end_mem = memory_end & PAGE_MASK;
  92         unsigned long zones_size[MAX_NR_ZONES] = { 0, };
  93
  94         high_memory = (void *) end_mem;
  95
  96         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
  97         memset(empty_zero_page, 0, PAGE_SIZE);
  98
  99         /*
 100          * Set up SFC/DFC registers (user data space).
 101          */
 102         set_fs (USER_DS);
 103
 104         zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 105         free_area_init(zones_size);
 106 }
 107
 108 #endif /* CONFIG_MMU */
 109
 110 void free_initmem(void)
 111 {
 112 #ifndef CONFIG_MMU_SUN3
 113         unsigned long addr;
 114
 115         addr = (unsigned long) __init_begin;
 116         for (; addr < ((unsigned long) __init_end); addr += PAGE_SIZE) {
 117                 ClearPageReserved(virt_to_page(addr));
 118                 init_page_count(virt_to_page(addr));
 119                 free_page(addr);
 120                 totalram_pages++;
 121         }
 122         pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n",
 123                 (addr - (unsigned long) __init_begin) >> 10,
 124                 (unsigned int) __init_begin, (unsigned int) __init_end);
 125 #endif /* CONFIG_MMU_SUN3 */
 126 }
 127
 128 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 129 #define VECTORS &vectors[0]
 130 #else
 131 #define VECTORS _ramvec
 132 #endif
 133
 134 void __init print_memmap(void)
 135 {
 136 #define UL(x) ((unsigned long) (x))
 137 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
 138 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
 139 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
 140
 141         pr_notice("Virtual kernel memory layout:\n"
 142                 "    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
 143                 "    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 144                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 145                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 146                 "      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 147                 "      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 148                 "      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 149                 "      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
 150                 MLK(VECTORS, VECTORS + 256),
 151                 MLM(KMAP_START, KMAP_END),
 152                 MLM(VMALLOC_START, VMALLOC_END),
 153                 MLM(PAGE_OFFSET, (unsigned long)high_memory),
 154                 MLK_ROUNDUP(__init_begin, __init_end),
 155                 MLK_ROUNDUP(_stext, _etext),
 156                 MLK_ROUNDUP(_sdata, _edata),
 157                 MLK_ROUNDUP(__bss_start, __bss_stop));
 158 }
 159
 160 void __init mem_init(void)
 161 {
 162         pg_data_t *pgdat;
 163         int codepages = 0;
 164         int datapages = 0;
 165         int initpages = 0;
 166         int i;
 167
 168         /* this will put all memory onto the freelists */
 169         totalram_pages = num_physpages = 0;
 170         for_each_online_pgdat(pgdat) {
 171                 num_physpages += pgdat->node_present_pages;
 172
 173                 totalram_pages += free_all_bootmem_node(pgdat);
 174                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 175                         struct page *page = pgdat->node_mem_map + i;
 176                         char *addr = page_to_virt(page);
 177
 178                         if (!PageReserved(page))
 179                                 continue;
 180                         if (addr >= _text &&
 181                             addr < _etext)
 182                                 codepages++;
 183                         else if (addr >= __init_begin &&
 184                                  addr < __init_end)
 185                                 initpages++;
 186                         else
 187                                 datapages++;
 188                 }
 189         }
 190
 191 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 192         /* insert pointer tables allocated so far into the tablelist */
 193         init_pointer_table((unsigned long)kernel_pg_dir);
 194         for (i = 0; i < PTRS_PER_PGD; i++) {
 195                 if (pgd_present(kernel_pg_dir[i]))
 196                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 197         }
 198
 199         /* insert also pointer table that we used to unmap the zero page */
 200         if (zero_pgtable)
 201                 init_pointer_table((unsigned long)zero_pgtable);
 202 #endif
 203
 204         pr_info("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 205                nr_free_pages() << (PAGE_SHIFT-10),
 206                totalram_pages << (PAGE_SHIFT-10),
 207                codepages << (PAGE_SHIFT-10),
 208                datapages << (PAGE_SHIFT-10),
 209                initpages << (PAGE_SHIFT-10));
 210         print_memmap();
 211 }
 212
 213 #ifdef CONFIG_BLK_DEV_INITRD
 214 void free_initrd_mem(unsigned long start, unsigned long end)
 215 {
 216         int pages = 0;
 217         for (; start < end; start += PAGE_SIZE) {
 218                 ClearPageReserved(virt_to_page(start));
 219                 init_page_count(virt_to_page(start));
 220                 free_page(start);
 221                 totalram_pages++;
 222                 pages++;
 223         }
 224         pr_notice("Freeing initrd memory: %dk freed\n",
 225                 pages << (PAGE_SHIFT - 10));
 226 }
 227 #endif