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