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
  21 #include <asm/setup.h>
  22 #include <asm/uaccess.h>
  23 #include <asm/page.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/system.h>
  26 #include <asm/machdep.h>
  27 #include <asm/io.h>
  28 #ifdef CONFIG_ATARI
  29 #include <asm/atari_stram.h>
  30 #endif
  31 #include <asm/tlb.h>
  32
  33 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  34
  35 pg_data_t pg_data_map[MAX_NUMNODES];
  36 EXPORT_SYMBOL(pg_data_map);
  37
  38 int m68k_virt_to_node_shift;
  39
  40 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  41 pg_data_t *pg_data_table[65];
  42 EXPORT_SYMBOL(pg_data_table);
  43 #endif
  44
  45 void __init m68k_setup_node(int node)
  46 {
  47 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  48         struct mem_info *info = m68k_memory + node;
  49         int i, end;
  50
  51         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  52         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  53         for (; i <= end; i++) {
  54                 if (pg_data_table[i])
  55                         printk("overlap at %u for chunk %u\n", i, node);
  56                 pg_data_table[i] = pg_data_map + node;
  57         }
  58 #endif
  59         pg_data_map[node].bdata = bootmem_node_data + node;
  60         node_set_online(node);
  61 }
  62
  63
  64 /*
  65  * ZERO_PAGE is a special page that is used for zero-initialized
  66  * data and COW.
  67  */
  68
  69 void *empty_zero_page;
  70 EXPORT_SYMBOL(empty_zero_page);
  71
  72 void show_mem(void)
  73 {
  74         pg_data_t *pgdat;
  75         int free = 0, total = 0, reserved = 0, shared = 0;
  76         int cached = 0;
  77         int i;
  78
  79         printk("\nMem-info:\n");
  80         show_free_areas();
  81         for_each_online_pgdat(pgdat) {
  82                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
  83                         struct page *page = pgdat->node_mem_map + i;
  84                         total++;
  85                         if (PageReserved(page))
  86                                 reserved++;
  87                         else if (PageSwapCache(page))
  88                                 cached++;
  89                         else if (!page_count(page))
  90                                 free++;
  91                         else
  92                                 shared += page_count(page) - 1;
  93                 }
  94         }
  95         printk("%d pages of RAM\n",total);
  96         printk("%d free pages\n",free);
  97         printk("%d reserved pages\n",reserved);
  98         printk("%d pages shared\n",shared);
  99         printk("%d pages swap cached\n",cached);
 100 }
 101
 102 extern void init_pointer_table(unsigned long ptable);
 103
 104 /* References to section boundaries */
 105
 106 extern char _text[], _etext[];
 107 extern char __init_begin[], __init_end[];
 108
 109 extern pmd_t *zero_pgtable;
 110
 111 void __init mem_init(void)
 112 {
 113         pg_data_t *pgdat;
 114         int codepages = 0;
 115         int datapages = 0;
 116         int initpages = 0;
 117         int i;
 118
 119 #ifdef CONFIG_ATARI
 120         if (MACH_IS_ATARI)
 121                 atari_stram_mem_init_hook();
 122 #endif
 123
 124         /* this will put all memory onto the freelists */
 125         totalram_pages = num_physpages = 0;
 126         for_each_online_pgdat(pgdat) {
 127                 num_physpages += pgdat->node_present_pages;
 128
 129                 totalram_pages += free_all_bootmem_node(pgdat);
 130                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
 131                         struct page *page = pgdat->node_mem_map + i;
 132                         char *addr = page_to_virt(page);
 133
 134                         if (!PageReserved(page))
 135                                 continue;
 136                         if (addr >= _text &&
 137                             addr < _etext)
 138                                 codepages++;
 139                         else if (addr >= __init_begin &&
 140                                  addr < __init_end)
 141                                 initpages++;
 142                         else
 143                                 datapages++;
 144                 }
 145         }
 146
 147 #ifndef CONFIG_SUN3
 148         /* insert pointer tables allocated so far into the tablelist */
 149         init_pointer_table((unsigned long)kernel_pg_dir);
 150         for (i = 0; i < PTRS_PER_PGD; i++) {
 151                 if (pgd_present(kernel_pg_dir[i]))
 152                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 153         }
 154
 155         /* insert also pointer table that we used to unmap the zero page */
 156         if (zero_pgtable)
 157                 init_pointer_table((unsigned long)zero_pgtable);
 158 #endif
 159
 160         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 161                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 162                totalram_pages << (PAGE_SHIFT-10),
 163                codepages << (PAGE_SHIFT-10),
 164                datapages << (PAGE_SHIFT-10),
 165                initpages << (PAGE_SHIFT-10));
 166 }
 167
 168 #ifdef CONFIG_BLK_DEV_INITRD
 169 void free_initrd_mem(unsigned long start, unsigned long end)
 170 {
 171         int pages = 0;
 172         for (; start < end; start += PAGE_SIZE) {
 173                 ClearPageReserved(virt_to_page(start));
 174                 init_page_count(virt_to_page(start));
 175                 free_page(start);
 176                 totalram_pages++;
 177                 pages++;
 178         }
 179         printk ("Freeing initrd memory: %dk freed\n", pages);
 180 }
 181 #endif