arch/cris/mm/init.c

   1 /*
   2  *  linux/arch/cris/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright (C) 2000,2001  Axis Communications AB
   6  *
   7  *  Authors:  Bjorn Wesen (bjornw@axis.com)
   8  *
   9  */
  10
  11 #include <linux/gfp.h>
  12 #include <linux/init.h>
  13 #include <linux/bootmem.h>
  14 #include <asm/tlb.h>
  15
  16 unsigned long empty_zero_page;
  17
  18 extern char _stext, _edata, _etext; /* From linkerscript */
  19 extern char __init_begin, __init_end;
  20
  21 void __init
  22 mem_init(void)
  23 {
  24         int codesize, reservedpages, datasize, initsize;
  25         unsigned long tmp;
  26
  27         BUG_ON(!mem_map);
  28
  29         /* max/min_low_pfn was set by setup.c
  30          * now we just copy it to some other necessary places...
  31          *
  32          * high_memory was also set in setup.c
  33          */
  34
  35         max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
  36
  37         /* this will put all memory onto the freelists */
  38         totalram_pages = free_all_bootmem();
  39
  40         reservedpages = 0;
  41         for (tmp = 0; tmp < max_mapnr; tmp++) {
  42                 /*
  43                  * Only count reserved RAM pages
  44                  */
  45                 if (PageReserved(mem_map + tmp))
  46                         reservedpages++;
  47         }
  48
  49         codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
  50         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
  51         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
  52
  53         printk(KERN_INFO
  54                "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
  55                "%dk init)\n" ,
  56                nr_free_pages() << (PAGE_SHIFT-10),
  57                max_mapnr << (PAGE_SHIFT-10),
  58                codesize >> 10,
  59                reservedpages << (PAGE_SHIFT-10),
  60                datasize >> 10,
  61                initsize >> 10
  62                );
  63 }
  64
  65 /* free the pages occupied by initialization code */
  66
  67 void
  68 free_initmem(void)
  69 {
  70         unsigned long addr;
  71
  72         addr = (unsigned long)(&__init_begin);
  73         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
  74                 ClearPageReserved(virt_to_page(addr));
  75                 init_page_count(virt_to_page(addr));
  76                 free_page(addr);
  77                 totalram_pages++;
  78         }
  79         printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
  80                 (unsigned long)((&__init_end - &__init_begin) >> 10));
  81 }