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