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/init.h>
  12 #include <linux/bootmem.h>
  13 #include <asm/tlb.h>
  14
  15 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  16
  17 unsigned long empty_zero_page;
  18
  19 extern char _stext, _edata, _etext; /* From linkerscript */
  20 extern char __init_begin, __init_end;
  21
  22 void __init
  23 mem_init(void)
  24 {
  25         int codesize, reservedpages, datasize, initsize;
  26         unsigned long tmp;
  27
  28         BUG_ON(!mem_map);
  29
  30         /* max/min_low_pfn was set by setup.c
  31          * now we just copy it to some other necessary places...
  32          *
  33          * high_memory was also set in setup.c
  34          */
  35
  36         max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
  37
  38         /* this will put all memory onto the freelists */
  39         totalram_pages = free_all_bootmem();
  40
  41         reservedpages = 0;
  42         for (tmp = 0; tmp < max_mapnr; tmp++) {
  43                 /*
  44                  * Only count reserved RAM pages
  45                  */
  46                 if (PageReserved(mem_map + tmp))
  47                         reservedpages++;
  48         }
  49
  50         codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
  51         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
  52         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
  53
  54         printk(KERN_INFO
  55                "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
  56                "%dk init)\n" ,
  57                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
  58                max_mapnr << (PAGE_SHIFT-10),
  59                codesize >> 10,
  60                reservedpages << (PAGE_SHIFT-10),
  61                datasize >> 10,
  62                initsize >> 10
  63                );
  64 }
  65
  66 /* free the pages occupied by initialization code */
  67
  68 void
  69 free_initmem(void)
  70 {
  71         unsigned long addr;
  72
  73         addr = (unsigned long)(&__init_begin);
  74         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
  75                 ClearPageReserved(virt_to_page(addr));
  76                 init_page_count(virt_to_page(addr));
  77                 free_page(addr);
  78                 totalram_pages++;
  79         }
  80         printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
  81                 (unsigned long)((&__init_end - &__init_begin) >> 10));
  82 }