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/signal.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/swap.h>
  14 #include <linux/kernel.h>
  15 #include <linux/string.h>
  16 #include <linux/types.h>
  17 #include <linux/init.h>
  18 #include <linux/bootmem.h>
  19
  20 #include <asm/setup.h>
  21 #include <asm/uaccess.h>
  22 #include <asm/page.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/system.h>
  25 #include <asm/machdep.h>
  26 #include <asm/io.h>
  27 #ifdef CONFIG_ATARI
  28 #include <asm/atari_stram.h>
  29 #endif
  30 #include <asm/tlb.h>
  31
  32 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  33
  34 /*
  35  * ZERO_PAGE is a special page that is used for zero-initialized
  36  * data and COW.
  37  */
  38
  39 void *empty_zero_page;
  40
  41 void show_mem(void)
  42 {
  43     unsigned long i;
  44     int free = 0, total = 0, reserved = 0, shared = 0;
  45     int cached = 0;
  46
  47     printk("\nMem-info:\n");
  48     show_free_areas();
  49     printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
  50     i = max_mapnr;
  51     while (i-- > 0) {
  52         total++;
  53         if (PageReserved(mem_map+i))
  54             reserved++;
  55         else if (PageSwapCache(mem_map+i))
  56             cached++;
  57         else if (!page_count(mem_map+i))
  58             free++;
  59         else
  60             shared += page_count(mem_map+i) - 1;
  61     }
  62     printk("%d pages of RAM\n",total);
  63     printk("%d free pages\n",free);
  64     printk("%d reserved pages\n",reserved);
  65     printk("%d pages shared\n",shared);
  66     printk("%d pages swap cached\n",cached);
  67 }
  68
  69 extern void init_pointer_table(unsigned long ptable);
  70
  71 /* References to section boundaries */
  72
  73 extern char _text, _etext, _edata, __bss_start, _end;
  74 extern char __init_begin, __init_end;
  75
  76 extern pmd_t *zero_pgtable;
  77
  78 void __init mem_init(void)
  79 {
  80         int codepages = 0;
  81         int datapages = 0;
  82         int initpages = 0;
  83         unsigned long tmp;
  84 #ifndef CONFIG_SUN3
  85         int i;
  86 #endif
  87
  88         max_mapnr = num_physpages = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT);
  89
  90 #ifdef CONFIG_ATARI
  91         if (MACH_IS_ATARI)
  92                 atari_stram_mem_init_hook();
  93 #endif
  94
  95         /* this will put all memory onto the freelists */
  96         totalram_pages = free_all_bootmem();
  97
  98         for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) {
  99                 if (PageReserved(virt_to_page(tmp))) {
 100                         if (tmp >= (unsigned long)&_text
 101                             && tmp < (unsigned long)&_etext)
 102                                 codepages++;
 103                         else if (tmp >= (unsigned long) &__init_begin
 104                                  && tmp < (unsigned long) &__init_end)
 105                                 initpages++;
 106                         else
 107                                 datapages++;
 108                         continue;
 109                 }
 110         }
 111
 112 #ifndef CONFIG_SUN3
 113         /* insert pointer tables allocated so far into the tablelist */
 114         init_pointer_table((unsigned long)kernel_pg_dir);
 115         for (i = 0; i < PTRS_PER_PGD; i++) {
 116                 if (pgd_present(kernel_pg_dir[i]))
 117                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 118         }
 119
 120         /* insert also pointer table that we used to unmap the zero page */
 121         if (zero_pgtable)
 122                 init_pointer_table((unsigned long)zero_pgtable);
 123 #endif
 124
 125         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 126                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 127                max_mapnr << (PAGE_SHIFT-10),
 128                codepages << (PAGE_SHIFT-10),
 129                datapages << (PAGE_SHIFT-10),
 130                initpages << (PAGE_SHIFT-10));
 131 }
 132
 133 #ifdef CONFIG_BLK_DEV_INITRD
 134 void free_initrd_mem(unsigned long start, unsigned long end)
 135 {
 136         int pages = 0;
 137         for (; start < end; start += PAGE_SIZE) {
 138                 ClearPageReserved(virt_to_page(start));
 139                 init_page_count(virt_to_page(start));
 140                 free_page(start);
 141                 totalram_pages++;
 142                 pages++;
 143         }
 144         printk ("Freeing initrd memory: %dk freed\n", pages);
 145 }
 146 #endif